70880be260151b62dce8ff5724a47bf8a28be7ac
[linux-2.6.git] / drivers / s390 / block / dasd_eckd.c
1 /*
2  * File...........: linux/drivers/s390/block/dasd_eckd.c
3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
5  *                  Carsten Otte <Cotte@de.ibm.com>
6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
7  * Bugreports.to..: <Linux390@de.ibm.com>
8  * Copyright IBM Corp. 1999, 2009
9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
11  */
12
13 #define KMSG_COMPONENT "dasd-eckd"
14
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
19 #include <linux/bio.h>
20 #include <linux/module.h>
21 #include <linux/init.h>
22
23 #include <asm/debug.h>
24 #include <asm/idals.h>
25 #include <asm/ebcdic.h>
26 #include <asm/compat.h>
27 #include <asm/io.h>
28 #include <asm/uaccess.h>
29 #include <asm/cio.h>
30 #include <asm/ccwdev.h>
31 #include <asm/itcw.h>
32
33 #include "dasd_int.h"
34 #include "dasd_eckd.h"
35 #include "../cio/chsc.h"
36
37
38 #ifdef PRINTK_HEADER
39 #undef PRINTK_HEADER
40 #endif                          /* PRINTK_HEADER */
41 #define PRINTK_HEADER "dasd(eckd):"
42
43 #define ECKD_C0(i) (i->home_bytes)
44 #define ECKD_F(i) (i->formula)
45 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
46                     (i->factors.f_0x02.f1))
47 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
48                     (i->factors.f_0x02.f2))
49 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
50                     (i->factors.f_0x02.f3))
51 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
52 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
53 #define ECKD_F6(i) (i->factor6)
54 #define ECKD_F7(i) (i->factor7)
55 #define ECKD_F8(i) (i->factor8)
56
57 /*
58  * raw track access always map to 64k in memory
59  * so it maps to 16 blocks of 4k per track
60  */
61 #define DASD_RAW_BLOCK_PER_TRACK 16
62 #define DASD_RAW_BLOCKSIZE 4096
63 /* 64k are 128 x 512 byte sectors  */
64 #define DASD_RAW_SECTORS_PER_TRACK 128
65
66 MODULE_LICENSE("GPL");
67
68 static struct dasd_discipline dasd_eckd_discipline;
69
70 /* The ccw bus type uses this table to find devices that it sends to
71  * dasd_eckd_probe */
72 static struct ccw_device_id dasd_eckd_ids[] = {
73         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
74         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
75         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
76         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
77         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
78         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
79         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
80         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
81         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
82         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
83         { /* end of list */ },
84 };
85
86 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
87
88 static struct ccw_driver dasd_eckd_driver; /* see below */
89
90 #define INIT_CQR_OK 0
91 #define INIT_CQR_UNFORMATTED 1
92 #define INIT_CQR_ERROR 2
93
94 /* emergency request for reserve/release */
95 static struct {
96         struct dasd_ccw_req cqr;
97         struct ccw1 ccw;
98         char data[32];
99 } *dasd_reserve_req;
100 static DEFINE_MUTEX(dasd_reserve_mutex);
101
102 /* definitions for the path verification worker */
103 struct path_verification_work_data {
104         struct work_struct worker;
105         struct dasd_device *device;
106         struct dasd_ccw_req cqr;
107         struct ccw1 ccw;
108         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
109         int isglobal;
110         __u8 tbvpm;
111 };
112 static struct path_verification_work_data *path_verification_worker;
113 static DEFINE_MUTEX(dasd_path_verification_mutex);
114
115 /* initial attempt at a probe function. this can be simplified once
116  * the other detection code is gone */
117 static int
118 dasd_eckd_probe (struct ccw_device *cdev)
119 {
120         int ret;
121
122         /* set ECKD specific ccw-device options */
123         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
124                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
125         if (ret) {
126                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
127                                 "dasd_eckd_probe: could not set "
128                                 "ccw-device options");
129                 return ret;
130         }
131         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
132         return ret;
133 }
134
135 static int
136 dasd_eckd_set_online(struct ccw_device *cdev)
137 {
138         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
139 }
140
141 static const int sizes_trk0[] = { 28, 148, 84 };
142 #define LABEL_SIZE 140
143
144 static inline unsigned int
145 round_up_multiple(unsigned int no, unsigned int mult)
146 {
147         int rem = no % mult;
148         return (rem ? no - rem + mult : no);
149 }
150
151 static inline unsigned int
152 ceil_quot(unsigned int d1, unsigned int d2)
153 {
154         return (d1 + (d2 - 1)) / d2;
155 }
156
157 static unsigned int
158 recs_per_track(struct dasd_eckd_characteristics * rdc,
159                unsigned int kl, unsigned int dl)
160 {
161         int dn, kn;
162
163         switch (rdc->dev_type) {
164         case 0x3380:
165                 if (kl)
166                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
167                                        ceil_quot(dl + 12, 32));
168                 else
169                         return 1499 / (15 + ceil_quot(dl + 12, 32));
170         case 0x3390:
171                 dn = ceil_quot(dl + 6, 232) + 1;
172                 if (kl) {
173                         kn = ceil_quot(kl + 6, 232) + 1;
174                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
175                                        9 + ceil_quot(dl + 6 * dn, 34));
176                 } else
177                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
178         case 0x9345:
179                 dn = ceil_quot(dl + 6, 232) + 1;
180                 if (kl) {
181                         kn = ceil_quot(kl + 6, 232) + 1;
182                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
183                                        ceil_quot(dl + 6 * dn, 34));
184                 } else
185                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
186         }
187         return 0;
188 }
189
190 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
191 {
192         geo->cyl = (__u16) cyl;
193         geo->head = cyl >> 16;
194         geo->head <<= 4;
195         geo->head |= head;
196 }
197
198 static int
199 check_XRC (struct ccw1         *de_ccw,
200            struct DE_eckd_data *data,
201            struct dasd_device  *device)
202 {
203         struct dasd_eckd_private *private;
204         int rc;
205
206         private = (struct dasd_eckd_private *) device->private;
207         if (!private->rdc_data.facilities.XRC_supported)
208                 return 0;
209
210         /* switch on System Time Stamp - needed for XRC Support */
211         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
212         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
213
214         rc = get_sync_clock(&data->ep_sys_time);
215         /* Ignore return code if sync clock is switched off. */
216         if (rc == -ENOSYS || rc == -EACCES)
217                 rc = 0;
218
219         de_ccw->count = sizeof(struct DE_eckd_data);
220         de_ccw->flags |= CCW_FLAG_SLI;
221         return rc;
222 }
223
224 static int
225 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
226               unsigned int totrk, int cmd, struct dasd_device *device)
227 {
228         struct dasd_eckd_private *private;
229         u32 begcyl, endcyl;
230         u16 heads, beghead, endhead;
231         int rc = 0;
232
233         private = (struct dasd_eckd_private *) device->private;
234
235         ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
236         ccw->flags = 0;
237         ccw->count = 16;
238         ccw->cda = (__u32) __pa(data);
239
240         memset(data, 0, sizeof(struct DE_eckd_data));
241         switch (cmd) {
242         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
243         case DASD_ECKD_CCW_READ_RECORD_ZERO:
244         case DASD_ECKD_CCW_READ:
245         case DASD_ECKD_CCW_READ_MT:
246         case DASD_ECKD_CCW_READ_CKD:
247         case DASD_ECKD_CCW_READ_CKD_MT:
248         case DASD_ECKD_CCW_READ_KD:
249         case DASD_ECKD_CCW_READ_KD_MT:
250         case DASD_ECKD_CCW_READ_COUNT:
251                 data->mask.perm = 0x1;
252                 data->attributes.operation = private->attrib.operation;
253                 break;
254         case DASD_ECKD_CCW_WRITE:
255         case DASD_ECKD_CCW_WRITE_MT:
256         case DASD_ECKD_CCW_WRITE_KD:
257         case DASD_ECKD_CCW_WRITE_KD_MT:
258                 data->mask.perm = 0x02;
259                 data->attributes.operation = private->attrib.operation;
260                 rc = check_XRC (ccw, data, device);
261                 break;
262         case DASD_ECKD_CCW_WRITE_CKD:
263         case DASD_ECKD_CCW_WRITE_CKD_MT:
264                 data->attributes.operation = DASD_BYPASS_CACHE;
265                 rc = check_XRC (ccw, data, device);
266                 break;
267         case DASD_ECKD_CCW_ERASE:
268         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
269         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
270                 data->mask.perm = 0x3;
271                 data->mask.auth = 0x1;
272                 data->attributes.operation = DASD_BYPASS_CACHE;
273                 rc = check_XRC (ccw, data, device);
274                 break;
275         default:
276                 dev_err(&device->cdev->dev,
277                         "0x%x is not a known command\n", cmd);
278                 break;
279         }
280
281         data->attributes.mode = 0x3;    /* ECKD */
282
283         if ((private->rdc_data.cu_type == 0x2105 ||
284              private->rdc_data.cu_type == 0x2107 ||
285              private->rdc_data.cu_type == 0x1750)
286             && !(private->uses_cdl && trk < 2))
287                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
288
289         heads = private->rdc_data.trk_per_cyl;
290         begcyl = trk / heads;
291         beghead = trk % heads;
292         endcyl = totrk / heads;
293         endhead = totrk % heads;
294
295         /* check for sequential prestage - enhance cylinder range */
296         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
297             data->attributes.operation == DASD_SEQ_ACCESS) {
298
299                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
300                         endcyl += private->attrib.nr_cyl;
301                 else
302                         endcyl = (private->real_cyl - 1);
303         }
304
305         set_ch_t(&data->beg_ext, begcyl, beghead);
306         set_ch_t(&data->end_ext, endcyl, endhead);
307         return rc;
308 }
309
310 static int check_XRC_on_prefix(struct PFX_eckd_data *pfxdata,
311                                struct dasd_device  *device)
312 {
313         struct dasd_eckd_private *private;
314         int rc;
315
316         private = (struct dasd_eckd_private *) device->private;
317         if (!private->rdc_data.facilities.XRC_supported)
318                 return 0;
319
320         /* switch on System Time Stamp - needed for XRC Support */
321         pfxdata->define_extent.ga_extended |= 0x08; /* 'Time Stamp Valid'   */
322         pfxdata->define_extent.ga_extended |= 0x02; /* 'Extended Parameter' */
323         pfxdata->validity.time_stamp = 1;           /* 'Time Stamp Valid'   */
324
325         rc = get_sync_clock(&pfxdata->define_extent.ep_sys_time);
326         /* Ignore return code if sync clock is switched off. */
327         if (rc == -ENOSYS || rc == -EACCES)
328                 rc = 0;
329         return rc;
330 }
331
332 static void fill_LRE_data(struct LRE_eckd_data *data, unsigned int trk,
333                           unsigned int rec_on_trk, int count, int cmd,
334                           struct dasd_device *device, unsigned int reclen,
335                           unsigned int tlf)
336 {
337         struct dasd_eckd_private *private;
338         int sector;
339         int dn, d;
340
341         private = (struct dasd_eckd_private *) device->private;
342
343         memset(data, 0, sizeof(*data));
344         sector = 0;
345         if (rec_on_trk) {
346                 switch (private->rdc_data.dev_type) {
347                 case 0x3390:
348                         dn = ceil_quot(reclen + 6, 232);
349                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
350                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
351                         break;
352                 case 0x3380:
353                         d = 7 + ceil_quot(reclen + 12, 32);
354                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
355                         break;
356                 }
357         }
358         data->sector = sector;
359         /* note: meaning of count depends on the operation
360          *       for record based I/O it's the number of records, but for
361          *       track based I/O it's the number of tracks
362          */
363         data->count = count;
364         switch (cmd) {
365         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
366                 data->operation.orientation = 0x3;
367                 data->operation.operation = 0x03;
368                 break;
369         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
370                 data->operation.orientation = 0x3;
371                 data->operation.operation = 0x16;
372                 break;
373         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
374                 data->operation.orientation = 0x1;
375                 data->operation.operation = 0x03;
376                 data->count++;
377                 break;
378         case DASD_ECKD_CCW_READ_RECORD_ZERO:
379                 data->operation.orientation = 0x3;
380                 data->operation.operation = 0x16;
381                 data->count++;
382                 break;
383         case DASD_ECKD_CCW_WRITE:
384         case DASD_ECKD_CCW_WRITE_MT:
385         case DASD_ECKD_CCW_WRITE_KD:
386         case DASD_ECKD_CCW_WRITE_KD_MT:
387                 data->auxiliary.length_valid = 0x1;
388                 data->length = reclen;
389                 data->operation.operation = 0x01;
390                 break;
391         case DASD_ECKD_CCW_WRITE_CKD:
392         case DASD_ECKD_CCW_WRITE_CKD_MT:
393                 data->auxiliary.length_valid = 0x1;
394                 data->length = reclen;
395                 data->operation.operation = 0x03;
396                 break;
397         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
398                 data->operation.orientation = 0x0;
399                 data->operation.operation = 0x3F;
400                 data->extended_operation = 0x11;
401                 data->length = 0;
402                 data->extended_parameter_length = 0x02;
403                 if (data->count > 8) {
404                         data->extended_parameter[0] = 0xFF;
405                         data->extended_parameter[1] = 0xFF;
406                         data->extended_parameter[1] <<= (16 - count);
407                 } else {
408                         data->extended_parameter[0] = 0xFF;
409                         data->extended_parameter[0] <<= (8 - count);
410                         data->extended_parameter[1] = 0x00;
411                 }
412                 data->sector = 0xFF;
413                 break;
414         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
415                 data->auxiliary.length_valid = 0x1;
416                 data->length = reclen;  /* not tlf, as one might think */
417                 data->operation.operation = 0x3F;
418                 data->extended_operation = 0x23;
419                 break;
420         case DASD_ECKD_CCW_READ:
421         case DASD_ECKD_CCW_READ_MT:
422         case DASD_ECKD_CCW_READ_KD:
423         case DASD_ECKD_CCW_READ_KD_MT:
424                 data->auxiliary.length_valid = 0x1;
425                 data->length = reclen;
426                 data->operation.operation = 0x06;
427                 break;
428         case DASD_ECKD_CCW_READ_CKD:
429         case DASD_ECKD_CCW_READ_CKD_MT:
430                 data->auxiliary.length_valid = 0x1;
431                 data->length = reclen;
432                 data->operation.operation = 0x16;
433                 break;
434         case DASD_ECKD_CCW_READ_COUNT:
435                 data->operation.operation = 0x06;
436                 break;
437         case DASD_ECKD_CCW_READ_TRACK:
438                 data->operation.orientation = 0x1;
439                 data->operation.operation = 0x0C;
440                 data->extended_parameter_length = 0;
441                 data->sector = 0xFF;
442                 break;
443         case DASD_ECKD_CCW_READ_TRACK_DATA:
444                 data->auxiliary.length_valid = 0x1;
445                 data->length = tlf;
446                 data->operation.operation = 0x0C;
447                 break;
448         case DASD_ECKD_CCW_ERASE:
449                 data->length = reclen;
450                 data->auxiliary.length_valid = 0x1;
451                 data->operation.operation = 0x0b;
452                 break;
453         default:
454                 DBF_DEV_EVENT(DBF_ERR, device,
455                             "fill LRE unknown opcode 0x%x", cmd);
456                 BUG();
457         }
458         set_ch_t(&data->seek_addr,
459                  trk / private->rdc_data.trk_per_cyl,
460                  trk % private->rdc_data.trk_per_cyl);
461         data->search_arg.cyl = data->seek_addr.cyl;
462         data->search_arg.head = data->seek_addr.head;
463         data->search_arg.record = rec_on_trk;
464 }
465
466 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
467                       unsigned int trk, unsigned int totrk, int cmd,
468                       struct dasd_device *basedev, struct dasd_device *startdev,
469                       unsigned char format, unsigned int rec_on_trk, int count,
470                       unsigned int blksize, unsigned int tlf)
471 {
472         struct dasd_eckd_private *basepriv, *startpriv;
473         struct DE_eckd_data *dedata;
474         struct LRE_eckd_data *lredata;
475         u32 begcyl, endcyl;
476         u16 heads, beghead, endhead;
477         int rc = 0;
478
479         basepriv = (struct dasd_eckd_private *) basedev->private;
480         startpriv = (struct dasd_eckd_private *) startdev->private;
481         dedata = &pfxdata->define_extent;
482         lredata = &pfxdata->locate_record;
483
484         ccw->cmd_code = DASD_ECKD_CCW_PFX;
485         ccw->flags = 0;
486         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
487                 ccw->count = sizeof(*pfxdata) + 2;
488                 ccw->cda = (__u32) __pa(pfxdata);
489                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
490         } else {
491                 ccw->count = sizeof(*pfxdata);
492                 ccw->cda = (__u32) __pa(pfxdata);
493                 memset(pfxdata, 0, sizeof(*pfxdata));
494         }
495
496         /* prefix data */
497         if (format > 1) {
498                 DBF_DEV_EVENT(DBF_ERR, basedev,
499                               "PFX LRE unknown format 0x%x", format);
500                 BUG();
501                 return -EINVAL;
502         }
503         pfxdata->format = format;
504         pfxdata->base_address = basepriv->ned->unit_addr;
505         pfxdata->base_lss = basepriv->ned->ID;
506         pfxdata->validity.define_extent = 1;
507
508         /* private uid is kept up to date, conf_data may be outdated */
509         if (startpriv->uid.type != UA_BASE_DEVICE) {
510                 pfxdata->validity.verify_base = 1;
511                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
512                         pfxdata->validity.hyper_pav = 1;
513         }
514
515         /* define extend data (mostly)*/
516         switch (cmd) {
517         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
518         case DASD_ECKD_CCW_READ_RECORD_ZERO:
519         case DASD_ECKD_CCW_READ:
520         case DASD_ECKD_CCW_READ_MT:
521         case DASD_ECKD_CCW_READ_CKD:
522         case DASD_ECKD_CCW_READ_CKD_MT:
523         case DASD_ECKD_CCW_READ_KD:
524         case DASD_ECKD_CCW_READ_KD_MT:
525         case DASD_ECKD_CCW_READ_COUNT:
526                 dedata->mask.perm = 0x1;
527                 dedata->attributes.operation = basepriv->attrib.operation;
528                 break;
529         case DASD_ECKD_CCW_READ_TRACK:
530         case DASD_ECKD_CCW_READ_TRACK_DATA:
531                 dedata->mask.perm = 0x1;
532                 dedata->attributes.operation = basepriv->attrib.operation;
533                 dedata->blk_size = 0;
534                 break;
535         case DASD_ECKD_CCW_WRITE:
536         case DASD_ECKD_CCW_WRITE_MT:
537         case DASD_ECKD_CCW_WRITE_KD:
538         case DASD_ECKD_CCW_WRITE_KD_MT:
539                 dedata->mask.perm = 0x02;
540                 dedata->attributes.operation = basepriv->attrib.operation;
541                 rc = check_XRC_on_prefix(pfxdata, basedev);
542                 break;
543         case DASD_ECKD_CCW_WRITE_CKD:
544         case DASD_ECKD_CCW_WRITE_CKD_MT:
545                 dedata->attributes.operation = DASD_BYPASS_CACHE;
546                 rc = check_XRC_on_prefix(pfxdata, basedev);
547                 break;
548         case DASD_ECKD_CCW_ERASE:
549         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
550         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
551                 dedata->mask.perm = 0x3;
552                 dedata->mask.auth = 0x1;
553                 dedata->attributes.operation = DASD_BYPASS_CACHE;
554                 rc = check_XRC_on_prefix(pfxdata, basedev);
555                 break;
556         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
557                 dedata->mask.perm = 0x03;
558                 dedata->attributes.operation = basepriv->attrib.operation;
559                 dedata->blk_size = 0;
560                 break;
561         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
562                 dedata->mask.perm = 0x02;
563                 dedata->attributes.operation = basepriv->attrib.operation;
564                 dedata->blk_size = blksize;
565                 rc = check_XRC_on_prefix(pfxdata, basedev);
566                 break;
567         default:
568                 DBF_DEV_EVENT(DBF_ERR, basedev,
569                             "PFX LRE unknown opcode 0x%x", cmd);
570                 BUG();
571                 return -EINVAL;
572         }
573
574         dedata->attributes.mode = 0x3;  /* ECKD */
575
576         if ((basepriv->rdc_data.cu_type == 0x2105 ||
577              basepriv->rdc_data.cu_type == 0x2107 ||
578              basepriv->rdc_data.cu_type == 0x1750)
579             && !(basepriv->uses_cdl && trk < 2))
580                 dedata->ga_extended |= 0x40; /* Regular Data Format Mode */
581
582         heads = basepriv->rdc_data.trk_per_cyl;
583         begcyl = trk / heads;
584         beghead = trk % heads;
585         endcyl = totrk / heads;
586         endhead = totrk % heads;
587
588         /* check for sequential prestage - enhance cylinder range */
589         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
590             dedata->attributes.operation == DASD_SEQ_ACCESS) {
591
592                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
593                         endcyl += basepriv->attrib.nr_cyl;
594                 else
595                         endcyl = (basepriv->real_cyl - 1);
596         }
597
598         set_ch_t(&dedata->beg_ext, begcyl, beghead);
599         set_ch_t(&dedata->end_ext, endcyl, endhead);
600
601         if (format == 1) {
602                 fill_LRE_data(lredata, trk, rec_on_trk, count, cmd,
603                               basedev, blksize, tlf);
604         }
605
606         return rc;
607 }
608
609 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
610                   unsigned int trk, unsigned int totrk, int cmd,
611                   struct dasd_device *basedev, struct dasd_device *startdev)
612 {
613         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
614                           0, 0, 0, 0, 0);
615 }
616
617 static void
618 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
619               unsigned int rec_on_trk, int no_rec, int cmd,
620               struct dasd_device * device, int reclen)
621 {
622         struct dasd_eckd_private *private;
623         int sector;
624         int dn, d;
625
626         private = (struct dasd_eckd_private *) device->private;
627
628         DBF_DEV_EVENT(DBF_INFO, device,
629                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
630                   trk, rec_on_trk, no_rec, cmd, reclen);
631
632         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
633         ccw->flags = 0;
634         ccw->count = 16;
635         ccw->cda = (__u32) __pa(data);
636
637         memset(data, 0, sizeof(struct LO_eckd_data));
638         sector = 0;
639         if (rec_on_trk) {
640                 switch (private->rdc_data.dev_type) {
641                 case 0x3390:
642                         dn = ceil_quot(reclen + 6, 232);
643                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
644                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
645                         break;
646                 case 0x3380:
647                         d = 7 + ceil_quot(reclen + 12, 32);
648                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
649                         break;
650                 }
651         }
652         data->sector = sector;
653         data->count = no_rec;
654         switch (cmd) {
655         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
656                 data->operation.orientation = 0x3;
657                 data->operation.operation = 0x03;
658                 break;
659         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
660                 data->operation.orientation = 0x3;
661                 data->operation.operation = 0x16;
662                 break;
663         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
664                 data->operation.orientation = 0x1;
665                 data->operation.operation = 0x03;
666                 data->count++;
667                 break;
668         case DASD_ECKD_CCW_READ_RECORD_ZERO:
669                 data->operation.orientation = 0x3;
670                 data->operation.operation = 0x16;
671                 data->count++;
672                 break;
673         case DASD_ECKD_CCW_WRITE:
674         case DASD_ECKD_CCW_WRITE_MT:
675         case DASD_ECKD_CCW_WRITE_KD:
676         case DASD_ECKD_CCW_WRITE_KD_MT:
677                 data->auxiliary.last_bytes_used = 0x1;
678                 data->length = reclen;
679                 data->operation.operation = 0x01;
680                 break;
681         case DASD_ECKD_CCW_WRITE_CKD:
682         case DASD_ECKD_CCW_WRITE_CKD_MT:
683                 data->auxiliary.last_bytes_used = 0x1;
684                 data->length = reclen;
685                 data->operation.operation = 0x03;
686                 break;
687         case DASD_ECKD_CCW_READ:
688         case DASD_ECKD_CCW_READ_MT:
689         case DASD_ECKD_CCW_READ_KD:
690         case DASD_ECKD_CCW_READ_KD_MT:
691                 data->auxiliary.last_bytes_used = 0x1;
692                 data->length = reclen;
693                 data->operation.operation = 0x06;
694                 break;
695         case DASD_ECKD_CCW_READ_CKD:
696         case DASD_ECKD_CCW_READ_CKD_MT:
697                 data->auxiliary.last_bytes_used = 0x1;
698                 data->length = reclen;
699                 data->operation.operation = 0x16;
700                 break;
701         case DASD_ECKD_CCW_READ_COUNT:
702                 data->operation.operation = 0x06;
703                 break;
704         case DASD_ECKD_CCW_ERASE:
705                 data->length = reclen;
706                 data->auxiliary.last_bytes_used = 0x1;
707                 data->operation.operation = 0x0b;
708                 break;
709         default:
710                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
711                               "opcode 0x%x", cmd);
712         }
713         set_ch_t(&data->seek_addr,
714                  trk / private->rdc_data.trk_per_cyl,
715                  trk % private->rdc_data.trk_per_cyl);
716         data->search_arg.cyl = data->seek_addr.cyl;
717         data->search_arg.head = data->seek_addr.head;
718         data->search_arg.record = rec_on_trk;
719 }
720
721 /*
722  * Returns 1 if the block is one of the special blocks that needs
723  * to get read/written with the KD variant of the command.
724  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
725  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
726  * Luckily the KD variants differ only by one bit (0x08) from the
727  * normal variant. So don't wonder about code like:
728  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
729  *         ccw->cmd_code |= 0x8;
730  */
731 static inline int
732 dasd_eckd_cdl_special(int blk_per_trk, int recid)
733 {
734         if (recid < 3)
735                 return 1;
736         if (recid < blk_per_trk)
737                 return 0;
738         if (recid < 2 * blk_per_trk)
739                 return 1;
740         return 0;
741 }
742
743 /*
744  * Returns the record size for the special blocks of the cdl format.
745  * Only returns something useful if dasd_eckd_cdl_special is true
746  * for the recid.
747  */
748 static inline int
749 dasd_eckd_cdl_reclen(int recid)
750 {
751         if (recid < 3)
752                 return sizes_trk0[recid];
753         return LABEL_SIZE;
754 }
755 /* create unique id from private structure. */
756 static void create_uid(struct dasd_eckd_private *private)
757 {
758         int count;
759         struct dasd_uid *uid;
760
761         uid = &private->uid;
762         memset(uid, 0, sizeof(struct dasd_uid));
763         memcpy(uid->vendor, private->ned->HDA_manufacturer,
764                sizeof(uid->vendor) - 1);
765         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
766         memcpy(uid->serial, private->ned->HDA_location,
767                sizeof(uid->serial) - 1);
768         EBCASC(uid->serial, sizeof(uid->serial) - 1);
769         uid->ssid = private->gneq->subsystemID;
770         uid->real_unit_addr = private->ned->unit_addr;
771         if (private->sneq) {
772                 uid->type = private->sneq->sua_flags;
773                 if (uid->type == UA_BASE_PAV_ALIAS)
774                         uid->base_unit_addr = private->sneq->base_unit_addr;
775         } else {
776                 uid->type = UA_BASE_DEVICE;
777         }
778         if (private->vdsneq) {
779                 for (count = 0; count < 16; count++) {
780                         sprintf(uid->vduit+2*count, "%02x",
781                                 private->vdsneq->uit[count]);
782                 }
783         }
784 }
785
786 /*
787  * Generate device unique id that specifies the physical device.
788  */
789 static int dasd_eckd_generate_uid(struct dasd_device *device)
790 {
791         struct dasd_eckd_private *private;
792         unsigned long flags;
793
794         private = (struct dasd_eckd_private *) device->private;
795         if (!private)
796                 return -ENODEV;
797         if (!private->ned || !private->gneq)
798                 return -ENODEV;
799         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
800         create_uid(private);
801         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
802         return 0;
803 }
804
805 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
806 {
807         struct dasd_eckd_private *private;
808         unsigned long flags;
809
810         if (device->private) {
811                 private = (struct dasd_eckd_private *)device->private;
812                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
813                 *uid = private->uid;
814                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
815                 return 0;
816         }
817         return -EINVAL;
818 }
819
820 /*
821  * compare device UID with data of a given dasd_eckd_private structure
822  * return 0 for match
823  */
824 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
825                                       struct dasd_eckd_private *private)
826 {
827         struct dasd_uid device_uid;
828
829         create_uid(private);
830         dasd_eckd_get_uid(device, &device_uid);
831
832         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
833 }
834
835 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
836                                    struct dasd_ccw_req *cqr,
837                                    __u8 *rcd_buffer,
838                                    __u8 lpm)
839 {
840         struct ccw1 *ccw;
841         /*
842          * buffer has to start with EBCDIC "V1.0" to show
843          * support for virtual device SNEQ
844          */
845         rcd_buffer[0] = 0xE5;
846         rcd_buffer[1] = 0xF1;
847         rcd_buffer[2] = 0x4B;
848         rcd_buffer[3] = 0xF0;
849
850         ccw = cqr->cpaddr;
851         ccw->cmd_code = DASD_ECKD_CCW_RCD;
852         ccw->flags = 0;
853         ccw->cda = (__u32)(addr_t)rcd_buffer;
854         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
855         cqr->magic = DASD_ECKD_MAGIC;
856
857         cqr->startdev = device;
858         cqr->memdev = device;
859         cqr->block = NULL;
860         cqr->expires = 10*HZ;
861         cqr->lpm = lpm;
862         cqr->retries = 256;
863         cqr->buildclk = get_clock();
864         cqr->status = DASD_CQR_FILLED;
865         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
866 }
867
868 /*
869  * Wakeup helper for read_conf
870  * if the cqr is not done and needs some error recovery
871  * the buffer has to be re-initialized with the EBCDIC "V1.0"
872  * to show support for virtual device SNEQ
873  */
874 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
875 {
876         struct ccw1 *ccw;
877         __u8 *rcd_buffer;
878
879         if (cqr->status !=  DASD_CQR_DONE) {
880                 ccw = cqr->cpaddr;
881                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
882                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
883
884                 rcd_buffer[0] = 0xE5;
885                 rcd_buffer[1] = 0xF1;
886                 rcd_buffer[2] = 0x4B;
887                 rcd_buffer[3] = 0xF0;
888         }
889         dasd_wakeup_cb(cqr, data);
890 }
891
892 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
893                                            struct dasd_ccw_req *cqr,
894                                            __u8 *rcd_buffer,
895                                            __u8 lpm)
896 {
897         struct ciw *ciw;
898         int rc;
899         /*
900          * sanity check: scan for RCD command in extended SenseID data
901          * some devices do not support RCD
902          */
903         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
904         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
905                 return -EOPNOTSUPP;
906
907         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
908         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
909         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
910         cqr->retries = 5;
911         cqr->callback = read_conf_cb;
912         rc = dasd_sleep_on_immediatly(cqr);
913         return rc;
914 }
915
916 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
917                                    void **rcd_buffer,
918                                    int *rcd_buffer_size, __u8 lpm)
919 {
920         struct ciw *ciw;
921         char *rcd_buf = NULL;
922         int ret;
923         struct dasd_ccw_req *cqr;
924
925         /*
926          * sanity check: scan for RCD command in extended SenseID data
927          * some devices do not support RCD
928          */
929         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
930         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
931                 ret = -EOPNOTSUPP;
932                 goto out_error;
933         }
934         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
935         if (!rcd_buf) {
936                 ret = -ENOMEM;
937                 goto out_error;
938         }
939         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
940                                    0, /* use rcd_buf as data ara */
941                                    device);
942         if (IS_ERR(cqr)) {
943                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
944                               "Could not allocate RCD request");
945                 ret = -ENOMEM;
946                 goto out_error;
947         }
948         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
949         cqr->callback = read_conf_cb;
950         ret = dasd_sleep_on(cqr);
951         /*
952          * on success we update the user input parms
953          */
954         dasd_sfree_request(cqr, cqr->memdev);
955         if (ret)
956                 goto out_error;
957
958         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
959         *rcd_buffer = rcd_buf;
960         return 0;
961 out_error:
962         kfree(rcd_buf);
963         *rcd_buffer = NULL;
964         *rcd_buffer_size = 0;
965         return ret;
966 }
967
968 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
969 {
970
971         struct dasd_sneq *sneq;
972         int i, count;
973
974         private->ned = NULL;
975         private->sneq = NULL;
976         private->vdsneq = NULL;
977         private->gneq = NULL;
978         count = private->conf_len / sizeof(struct dasd_sneq);
979         sneq = (struct dasd_sneq *)private->conf_data;
980         for (i = 0; i < count; ++i) {
981                 if (sneq->flags.identifier == 1 && sneq->format == 1)
982                         private->sneq = sneq;
983                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
984                         private->vdsneq = (struct vd_sneq *)sneq;
985                 else if (sneq->flags.identifier == 2)
986                         private->gneq = (struct dasd_gneq *)sneq;
987                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
988                         private->ned = (struct dasd_ned *)sneq;
989                 sneq++;
990         }
991         if (!private->ned || !private->gneq) {
992                 private->ned = NULL;
993                 private->sneq = NULL;
994                 private->vdsneq = NULL;
995                 private->gneq = NULL;
996                 return -EINVAL;
997         }
998         return 0;
999
1000 };
1001
1002 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
1003 {
1004         struct dasd_gneq *gneq;
1005         int i, count, found;
1006
1007         count = conf_len / sizeof(*gneq);
1008         gneq = (struct dasd_gneq *)conf_data;
1009         found = 0;
1010         for (i = 0; i < count; ++i) {
1011                 if (gneq->flags.identifier == 2) {
1012                         found = 1;
1013                         break;
1014                 }
1015                 gneq++;
1016         }
1017         if (found)
1018                 return ((char *)gneq)[18] & 0x07;
1019         else
1020                 return 0;
1021 }
1022
1023 static int dasd_eckd_read_conf(struct dasd_device *device)
1024 {
1025         void *conf_data;
1026         int conf_len, conf_data_saved;
1027         int rc;
1028         __u8 lpm, opm;
1029         struct dasd_eckd_private *private, path_private;
1030         struct dasd_path *path_data;
1031         struct dasd_uid *uid;
1032         char print_path_uid[60], print_device_uid[60];
1033
1034         private = (struct dasd_eckd_private *) device->private;
1035         path_data = &device->path_data;
1036         opm = ccw_device_get_path_mask(device->cdev);
1037         conf_data_saved = 0;
1038         /* get configuration data per operational path */
1039         for (lpm = 0x80; lpm; lpm>>= 1) {
1040                 if (!(lpm & opm))
1041                         continue;
1042                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1043                                              &conf_len, lpm);
1044                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1045                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1046                                         "Read configuration data returned "
1047                                         "error %d", rc);
1048                         return rc;
1049                 }
1050                 if (conf_data == NULL) {
1051                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1052                                         "No configuration data "
1053                                         "retrieved");
1054                         /* no further analysis possible */
1055                         path_data->opm |= lpm;
1056                         continue;       /* no error */
1057                 }
1058                 /* save first valid configuration data */
1059                 if (!conf_data_saved) {
1060                         kfree(private->conf_data);
1061                         private->conf_data = conf_data;
1062                         private->conf_len = conf_len;
1063                         if (dasd_eckd_identify_conf_parts(private)) {
1064                                 private->conf_data = NULL;
1065                                 private->conf_len = 0;
1066                                 kfree(conf_data);
1067                                 continue;
1068                         }
1069                         /*
1070                          * build device UID that other path data
1071                          * can be compared to it
1072                          */
1073                         dasd_eckd_generate_uid(device);
1074                         conf_data_saved++;
1075                 } else {
1076                         path_private.conf_data = conf_data;
1077                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1078                         if (dasd_eckd_identify_conf_parts(
1079                                     &path_private)) {
1080                                 path_private.conf_data = NULL;
1081                                 path_private.conf_len = 0;
1082                                 kfree(conf_data);
1083                                 continue;
1084                         }
1085
1086                         if (dasd_eckd_compare_path_uid(
1087                                     device, &path_private)) {
1088                                 uid = &path_private.uid;
1089                                 if (strlen(uid->vduit) > 0)
1090                                         snprintf(print_path_uid,
1091                                                  sizeof(print_path_uid),
1092                                                  "%s.%s.%04x.%02x.%s",
1093                                                  uid->vendor, uid->serial,
1094                                                  uid->ssid, uid->real_unit_addr,
1095                                                  uid->vduit);
1096                                 else
1097                                         snprintf(print_path_uid,
1098                                                  sizeof(print_path_uid),
1099                                                  "%s.%s.%04x.%02x",
1100                                                  uid->vendor, uid->serial,
1101                                                  uid->ssid,
1102                                                  uid->real_unit_addr);
1103                                 uid = &private->uid;
1104                                 if (strlen(uid->vduit) > 0)
1105                                         snprintf(print_device_uid,
1106                                                  sizeof(print_device_uid),
1107                                                  "%s.%s.%04x.%02x.%s",
1108                                                  uid->vendor, uid->serial,
1109                                                  uid->ssid, uid->real_unit_addr,
1110                                                  uid->vduit);
1111                                 else
1112                                         snprintf(print_device_uid,
1113                                                  sizeof(print_device_uid),
1114                                                  "%s.%s.%04x.%02x",
1115                                                  uid->vendor, uid->serial,
1116                                                  uid->ssid,
1117                                                  uid->real_unit_addr);
1118                                 dev_err(&device->cdev->dev,
1119                                         "Not all channel paths lead to "
1120                                         "the same device, path %02X leads to "
1121                                         "device %s instead of %s\n", lpm,
1122                                         print_path_uid, print_device_uid);
1123                                 return -EINVAL;
1124                         }
1125
1126                         path_private.conf_data = NULL;
1127                         path_private.conf_len = 0;
1128                 }
1129                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1130                 case 0x02:
1131                         path_data->npm |= lpm;
1132                         break;
1133                 case 0x03:
1134                         path_data->ppm |= lpm;
1135                         break;
1136                 }
1137                 path_data->opm |= lpm;
1138
1139                 if (conf_data != private->conf_data)
1140                         kfree(conf_data);
1141         }
1142
1143         return 0;
1144 }
1145
1146 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1147 {
1148         struct dasd_eckd_private *private;
1149         int mdc;
1150         u32 fcx_max_data;
1151
1152         private = (struct dasd_eckd_private *) device->private;
1153         if (private->fcx_max_data) {
1154                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1155                 if ((mdc < 0)) {
1156                         dev_warn(&device->cdev->dev,
1157                                  "Detecting the maximum data size for zHPF "
1158                                  "requests failed (rc=%d) for a new path %x\n",
1159                                  mdc, lpm);
1160                         return mdc;
1161                 }
1162                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1163                 if (fcx_max_data < private->fcx_max_data) {
1164                         dev_warn(&device->cdev->dev,
1165                                  "The maximum data size for zHPF requests %u "
1166                                  "on a new path %x is below the active maximum "
1167                                  "%u\n", fcx_max_data, lpm,
1168                                  private->fcx_max_data);
1169                         return -EACCES;
1170                 }
1171         }
1172         return 0;
1173 }
1174
1175 static int rebuild_device_uid(struct dasd_device *device,
1176                               struct path_verification_work_data *data)
1177 {
1178         struct dasd_eckd_private *private;
1179         struct dasd_path *path_data;
1180         __u8 lpm, opm;
1181         int rc;
1182
1183         rc = -ENODEV;
1184         private = (struct dasd_eckd_private *) device->private;
1185         path_data = &device->path_data;
1186         opm = device->path_data.opm;
1187
1188         for (lpm = 0x80; lpm; lpm >>= 1) {
1189                 if (!(lpm & opm))
1190                         continue;
1191                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1192                 memset(&data->cqr, 0, sizeof(data->cqr));
1193                 data->cqr.cpaddr = &data->ccw;
1194                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1195                                                      data->rcd_buffer,
1196                                                      lpm);
1197
1198                 if (rc) {
1199                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1200                                 continue;
1201                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1202                                         "Read configuration data "
1203                                         "returned error %d", rc);
1204                         break;
1205                 }
1206                 memcpy(private->conf_data, data->rcd_buffer,
1207                        DASD_ECKD_RCD_DATA_SIZE);
1208                 if (dasd_eckd_identify_conf_parts(private)) {
1209                         rc = -ENODEV;
1210                 } else /* first valid path is enough */
1211                         break;
1212         }
1213
1214         if (!rc)
1215                 rc = dasd_eckd_generate_uid(device);
1216
1217         return rc;
1218 }
1219
1220 static void do_path_verification_work(struct work_struct *work)
1221 {
1222         struct path_verification_work_data *data;
1223         struct dasd_device *device;
1224         struct dasd_eckd_private path_private;
1225         struct dasd_uid *uid;
1226         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1227         __u8 lpm, opm, npm, ppm, epm;
1228         unsigned long flags;
1229         char print_uid[60];
1230         int rc;
1231
1232         data = container_of(work, struct path_verification_work_data, worker);
1233         device = data->device;
1234
1235         /* delay path verification until device was resumed */
1236         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1237                 schedule_work(work);
1238                 return;
1239         }
1240
1241         opm = 0;
1242         npm = 0;
1243         ppm = 0;
1244         epm = 0;
1245         for (lpm = 0x80; lpm; lpm >>= 1) {
1246                 if (!(lpm & data->tbvpm))
1247                         continue;
1248                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1249                 memset(&data->cqr, 0, sizeof(data->cqr));
1250                 data->cqr.cpaddr = &data->ccw;
1251                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1252                                                      data->rcd_buffer,
1253                                                      lpm);
1254                 if (!rc) {
1255                         switch (dasd_eckd_path_access(data->rcd_buffer,
1256                                                       DASD_ECKD_RCD_DATA_SIZE)
1257                                 ) {
1258                         case 0x02:
1259                                 npm |= lpm;
1260                                 break;
1261                         case 0x03:
1262                                 ppm |= lpm;
1263                                 break;
1264                         }
1265                         opm |= lpm;
1266                 } else if (rc == -EOPNOTSUPP) {
1267                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1268                                         "path verification: No configuration "
1269                                         "data retrieved");
1270                         opm |= lpm;
1271                 } else if (rc == -EAGAIN) {
1272                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1273                                         "path verification: device is stopped,"
1274                                         " try again later");
1275                         epm |= lpm;
1276                 } else {
1277                         dev_warn(&device->cdev->dev,
1278                                  "Reading device feature codes failed "
1279                                  "(rc=%d) for new path %x\n", rc, lpm);
1280                         continue;
1281                 }
1282                 if (verify_fcx_max_data(device, lpm)) {
1283                         opm &= ~lpm;
1284                         npm &= ~lpm;
1285                         ppm &= ~lpm;
1286                         continue;
1287                 }
1288
1289                 /*
1290                  * save conf_data for comparison after
1291                  * rebuild_device_uid may have changed
1292                  * the original data
1293                  */
1294                 memcpy(&path_rcd_buf, data->rcd_buffer,
1295                        DASD_ECKD_RCD_DATA_SIZE);
1296                 path_private.conf_data = (void *) &path_rcd_buf;
1297                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1298                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1299                         path_private.conf_data = NULL;
1300                         path_private.conf_len = 0;
1301                         continue;
1302                 }
1303
1304                 /*
1305                  * compare path UID with device UID only if at least
1306                  * one valid path is left
1307                  * in other case the device UID may have changed and
1308                  * the first working path UID will be used as device UID
1309                  */
1310                 if (device->path_data.opm &&
1311                     dasd_eckd_compare_path_uid(device, &path_private)) {
1312                         /*
1313                          * the comparison was not successful
1314                          * rebuild the device UID with at least one
1315                          * known path in case a z/VM hyperswap command
1316                          * has changed the device
1317                          *
1318                          * after this compare again
1319                          *
1320                          * if either the rebuild or the recompare fails
1321                          * the path can not be used
1322                          */
1323                         if (rebuild_device_uid(device, data) ||
1324                             dasd_eckd_compare_path_uid(
1325                                     device, &path_private)) {
1326                                 uid = &path_private.uid;
1327                                 if (strlen(uid->vduit) > 0)
1328                                         snprintf(print_uid, sizeof(print_uid),
1329                                                  "%s.%s.%04x.%02x.%s",
1330                                                  uid->vendor, uid->serial,
1331                                                  uid->ssid, uid->real_unit_addr,
1332                                                  uid->vduit);
1333                                 else
1334                                         snprintf(print_uid, sizeof(print_uid),
1335                                                  "%s.%s.%04x.%02x",
1336                                                  uid->vendor, uid->serial,
1337                                                  uid->ssid,
1338                                                  uid->real_unit_addr);
1339                                 dev_err(&device->cdev->dev,
1340                                         "The newly added channel path %02X "
1341                                         "will not be used because it leads "
1342                                         "to a different device %s\n",
1343                                         lpm, print_uid);
1344                                 opm &= ~lpm;
1345                                 npm &= ~lpm;
1346                                 ppm &= ~lpm;
1347                                 continue;
1348                         }
1349                 }
1350
1351                 /*
1352                  * There is a small chance that a path is lost again between
1353                  * above path verification and the following modification of
1354                  * the device opm mask. We could avoid that race here by using
1355                  * yet another path mask, but we rather deal with this unlikely
1356                  * situation in dasd_start_IO.
1357                  */
1358                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1359                 if (!device->path_data.opm && opm) {
1360                         device->path_data.opm = opm;
1361                         dasd_generic_path_operational(device);
1362                 } else
1363                         device->path_data.opm |= opm;
1364                 device->path_data.npm |= npm;
1365                 device->path_data.ppm |= ppm;
1366                 device->path_data.tbvpm |= epm;
1367                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1368         }
1369
1370         dasd_put_device(device);
1371         if (data->isglobal)
1372                 mutex_unlock(&dasd_path_verification_mutex);
1373         else
1374                 kfree(data);
1375 }
1376
1377 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1378 {
1379         struct path_verification_work_data *data;
1380
1381         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1382         if (!data) {
1383                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1384                         data = path_verification_worker;
1385                         data->isglobal = 1;
1386                 } else
1387                         return -ENOMEM;
1388         } else {
1389                 memset(data, 0, sizeof(*data));
1390                 data->isglobal = 0;
1391         }
1392         INIT_WORK(&data->worker, do_path_verification_work);
1393         dasd_get_device(device);
1394         data->device = device;
1395         data->tbvpm = lpm;
1396         schedule_work(&data->worker);
1397         return 0;
1398 }
1399
1400 static int dasd_eckd_read_features(struct dasd_device *device)
1401 {
1402         struct dasd_psf_prssd_data *prssdp;
1403         struct dasd_rssd_features *features;
1404         struct dasd_ccw_req *cqr;
1405         struct ccw1 *ccw;
1406         int rc;
1407         struct dasd_eckd_private *private;
1408
1409         private = (struct dasd_eckd_private *) device->private;
1410         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1411         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1412                                    (sizeof(struct dasd_psf_prssd_data) +
1413                                     sizeof(struct dasd_rssd_features)),
1414                                    device);
1415         if (IS_ERR(cqr)) {
1416                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1417                                 "allocate initialization request");
1418                 return PTR_ERR(cqr);
1419         }
1420         cqr->startdev = device;
1421         cqr->memdev = device;
1422         cqr->block = NULL;
1423         cqr->retries = 256;
1424         cqr->expires = 10 * HZ;
1425
1426         /* Prepare for Read Subsystem Data */
1427         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1428         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1429         prssdp->order = PSF_ORDER_PRSSD;
1430         prssdp->suborder = 0x41;        /* Read Feature Codes */
1431         /* all other bytes of prssdp must be zero */
1432
1433         ccw = cqr->cpaddr;
1434         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1435         ccw->count = sizeof(struct dasd_psf_prssd_data);
1436         ccw->flags |= CCW_FLAG_CC;
1437         ccw->cda = (__u32)(addr_t) prssdp;
1438
1439         /* Read Subsystem Data - feature codes */
1440         features = (struct dasd_rssd_features *) (prssdp + 1);
1441         memset(features, 0, sizeof(struct dasd_rssd_features));
1442
1443         ccw++;
1444         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1445         ccw->count = sizeof(struct dasd_rssd_features);
1446         ccw->cda = (__u32)(addr_t) features;
1447
1448         cqr->buildclk = get_clock();
1449         cqr->status = DASD_CQR_FILLED;
1450         rc = dasd_sleep_on(cqr);
1451         if (rc == 0) {
1452                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1453                 features = (struct dasd_rssd_features *) (prssdp + 1);
1454                 memcpy(&private->features, features,
1455                        sizeof(struct dasd_rssd_features));
1456         } else
1457                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1458                          " failed with rc=%d\n", rc);
1459         dasd_sfree_request(cqr, cqr->memdev);
1460         return rc;
1461 }
1462
1463
1464 /*
1465  * Build CP for Perform Subsystem Function - SSC.
1466  */
1467 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1468                                                     int enable_pav)
1469 {
1470         struct dasd_ccw_req *cqr;
1471         struct dasd_psf_ssc_data *psf_ssc_data;
1472         struct ccw1 *ccw;
1473
1474         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1475                                   sizeof(struct dasd_psf_ssc_data),
1476                                   device);
1477
1478         if (IS_ERR(cqr)) {
1479                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1480                            "Could not allocate PSF-SSC request");
1481                 return cqr;
1482         }
1483         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1484         psf_ssc_data->order = PSF_ORDER_SSC;
1485         psf_ssc_data->suborder = 0xc0;
1486         if (enable_pav) {
1487                 psf_ssc_data->suborder |= 0x08;
1488                 psf_ssc_data->reserved[0] = 0x88;
1489         }
1490         ccw = cqr->cpaddr;
1491         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1492         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1493         ccw->count = 66;
1494
1495         cqr->startdev = device;
1496         cqr->memdev = device;
1497         cqr->block = NULL;
1498         cqr->retries = 256;
1499         cqr->expires = 10*HZ;
1500         cqr->buildclk = get_clock();
1501         cqr->status = DASD_CQR_FILLED;
1502         return cqr;
1503 }
1504
1505 /*
1506  * Perform Subsystem Function.
1507  * It is necessary to trigger CIO for channel revalidation since this
1508  * call might change behaviour of DASD devices.
1509  */
1510 static int
1511 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav)
1512 {
1513         struct dasd_ccw_req *cqr;
1514         int rc;
1515
1516         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1517         if (IS_ERR(cqr))
1518                 return PTR_ERR(cqr);
1519
1520         rc = dasd_sleep_on(cqr);
1521         if (!rc)
1522                 /* trigger CIO to reprobe devices */
1523                 css_schedule_reprobe();
1524         dasd_sfree_request(cqr, cqr->memdev);
1525         return rc;
1526 }
1527
1528 /*
1529  * Valide storage server of current device.
1530  */
1531 static void dasd_eckd_validate_server(struct dasd_device *device)
1532 {
1533         int rc;
1534         struct dasd_eckd_private *private;
1535         int enable_pav;
1536
1537         private = (struct dasd_eckd_private *) device->private;
1538         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1539             private->uid.type == UA_HYPER_PAV_ALIAS)
1540                 return;
1541         if (dasd_nopav || MACHINE_IS_VM)
1542                 enable_pav = 0;
1543         else
1544                 enable_pav = 1;
1545         rc = dasd_eckd_psf_ssc(device, enable_pav);
1546
1547         /* may be requested feature is not available on server,
1548          * therefore just report error and go ahead */
1549         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1550                         "returned rc=%d", private->uid.ssid, rc);
1551 }
1552
1553 /*
1554  * worker to do a validate server in case of a lost pathgroup
1555  */
1556 static void dasd_eckd_do_validate_server(struct work_struct *work)
1557 {
1558         struct dasd_device *device = container_of(work, struct dasd_device,
1559                                                   kick_validate);
1560         dasd_eckd_validate_server(device);
1561         dasd_put_device(device);
1562 }
1563
1564 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1565 {
1566         dasd_get_device(device);
1567         /* queue call to do_validate_server to the kernel event daemon. */
1568         schedule_work(&device->kick_validate);
1569 }
1570
1571 static u32 get_fcx_max_data(struct dasd_device *device)
1572 {
1573 #if defined(CONFIG_64BIT)
1574         int tpm, mdc;
1575         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1576         struct dasd_eckd_private *private;
1577
1578         if (dasd_nofcx)
1579                 return 0;
1580         /* is transport mode supported? */
1581         private = (struct dasd_eckd_private *) device->private;
1582         fcx_in_css = css_general_characteristics.fcx;
1583         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1584         fcx_in_features = private->features.feature[40] & 0x80;
1585         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1586
1587         if (!tpm)
1588                 return 0;
1589
1590         mdc = ccw_device_get_mdc(device->cdev, 0);
1591         if (mdc < 0) {
1592                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1593                          " data size for zHPF requests failed\n");
1594                 return 0;
1595         } else
1596                 return mdc * FCX_MAX_DATA_FACTOR;
1597 #else
1598         return 0;
1599 #endif
1600 }
1601
1602 /*
1603  * Check device characteristics.
1604  * If the device is accessible using ECKD discipline, the device is enabled.
1605  */
1606 static int
1607 dasd_eckd_check_characteristics(struct dasd_device *device)
1608 {
1609         struct dasd_eckd_private *private;
1610         struct dasd_block *block;
1611         struct dasd_uid temp_uid;
1612         int rc, i;
1613         int readonly;
1614         unsigned long value;
1615
1616         /* setup work queue for validate server*/
1617         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1618
1619         if (!ccw_device_is_pathgroup(device->cdev)) {
1620                 dev_warn(&device->cdev->dev,
1621                          "A channel path group could not be established\n");
1622                 return -EIO;
1623         }
1624         if (!ccw_device_is_multipath(device->cdev)) {
1625                 dev_info(&device->cdev->dev,
1626                          "The DASD is not operating in multipath mode\n");
1627         }
1628         private = (struct dasd_eckd_private *) device->private;
1629         if (!private) {
1630                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1631                 if (!private) {
1632                         dev_warn(&device->cdev->dev,
1633                                  "Allocating memory for private DASD data "
1634                                  "failed\n");
1635                         return -ENOMEM;
1636                 }
1637                 device->private = (void *) private;
1638         } else {
1639                 memset(private, 0, sizeof(*private));
1640         }
1641         /* Invalidate status of initial analysis. */
1642         private->init_cqr_status = -1;
1643         /* Set default cache operations. */
1644         private->attrib.operation = DASD_NORMAL_CACHE;
1645         private->attrib.nr_cyl = 0;
1646
1647         /* Read Configuration Data */
1648         rc = dasd_eckd_read_conf(device);
1649         if (rc)
1650                 goto out_err1;
1651
1652         /* set default timeout */
1653         device->default_expires = DASD_EXPIRES;
1654         if (private->gneq) {
1655                 value = 1;
1656                 for (i = 0; i < private->gneq->timeout.value; i++)
1657                         value = 10 * value;
1658                 value = value * private->gneq->timeout.number;
1659                 /* do not accept useless values */
1660                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1661                         device->default_expires = value;
1662         }
1663
1664         dasd_eckd_get_uid(device, &temp_uid);
1665         if (temp_uid.type == UA_BASE_DEVICE) {
1666                 block = dasd_alloc_block();
1667                 if (IS_ERR(block)) {
1668                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1669                                         "could not allocate dasd "
1670                                         "block structure");
1671                         rc = PTR_ERR(block);
1672                         goto out_err1;
1673                 }
1674                 device->block = block;
1675                 block->base = device;
1676         }
1677
1678         /* register lcu with alias handling, enable PAV */
1679         rc = dasd_alias_make_device_known_to_lcu(device);
1680         if (rc)
1681                 goto out_err2;
1682
1683         dasd_eckd_validate_server(device);
1684
1685         /* device may report different configuration data after LCU setup */
1686         rc = dasd_eckd_read_conf(device);
1687         if (rc)
1688                 goto out_err3;
1689
1690         /* Read Feature Codes */
1691         dasd_eckd_read_features(device);
1692
1693         /* Read Device Characteristics */
1694         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1695                                          &private->rdc_data, 64);
1696         if (rc) {
1697                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1698                                 "Read device characteristic failed, rc=%d", rc);
1699                 goto out_err3;
1700         }
1701
1702         if ((device->features & DASD_FEATURE_USERAW) &&
1703             !(private->rdc_data.facilities.RT_in_LR)) {
1704                 dev_err(&device->cdev->dev, "The storage server does not "
1705                         "support raw-track access\n");
1706                 rc = -EINVAL;
1707                 goto out_err3;
1708         }
1709
1710         /* find the valid cylinder size */
1711         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1712             private->rdc_data.long_no_cyl)
1713                 private->real_cyl = private->rdc_data.long_no_cyl;
1714         else
1715                 private->real_cyl = private->rdc_data.no_cyl;
1716
1717         private->fcx_max_data = get_fcx_max_data(device);
1718
1719         readonly = dasd_device_is_ro(device);
1720         if (readonly)
1721                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1722
1723         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1724                  "with %d cylinders, %d heads, %d sectors%s\n",
1725                  private->rdc_data.dev_type,
1726                  private->rdc_data.dev_model,
1727                  private->rdc_data.cu_type,
1728                  private->rdc_data.cu_model.model,
1729                  private->real_cyl,
1730                  private->rdc_data.trk_per_cyl,
1731                  private->rdc_data.sec_per_trk,
1732                  readonly ? ", read-only device" : "");
1733         return 0;
1734
1735 out_err3:
1736         dasd_alias_disconnect_device_from_lcu(device);
1737 out_err2:
1738         dasd_free_block(device->block);
1739         device->block = NULL;
1740 out_err1:
1741         kfree(private->conf_data);
1742         kfree(device->private);
1743         device->private = NULL;
1744         return rc;
1745 }
1746
1747 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1748 {
1749         struct dasd_eckd_private *private;
1750
1751         private = (struct dasd_eckd_private *) device->private;
1752         dasd_alias_disconnect_device_from_lcu(device);
1753         private->ned = NULL;
1754         private->sneq = NULL;
1755         private->vdsneq = NULL;
1756         private->gneq = NULL;
1757         private->conf_len = 0;
1758         kfree(private->conf_data);
1759         private->conf_data = NULL;
1760 }
1761
1762 static struct dasd_ccw_req *
1763 dasd_eckd_analysis_ccw(struct dasd_device *device)
1764 {
1765         struct dasd_eckd_private *private;
1766         struct eckd_count *count_data;
1767         struct LO_eckd_data *LO_data;
1768         struct dasd_ccw_req *cqr;
1769         struct ccw1 *ccw;
1770         int cplength, datasize;
1771         int i;
1772
1773         private = (struct dasd_eckd_private *) device->private;
1774
1775         cplength = 8;
1776         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1777         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1778         if (IS_ERR(cqr))
1779                 return cqr;
1780         ccw = cqr->cpaddr;
1781         /* Define extent for the first 3 tracks. */
1782         define_extent(ccw++, cqr->data, 0, 2,
1783                       DASD_ECKD_CCW_READ_COUNT, device);
1784         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1785         /* Locate record for the first 4 records on track 0. */
1786         ccw[-1].flags |= CCW_FLAG_CC;
1787         locate_record(ccw++, LO_data++, 0, 0, 4,
1788                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1789
1790         count_data = private->count_area;
1791         for (i = 0; i < 4; i++) {
1792                 ccw[-1].flags |= CCW_FLAG_CC;
1793                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1794                 ccw->flags = 0;
1795                 ccw->count = 8;
1796                 ccw->cda = (__u32)(addr_t) count_data;
1797                 ccw++;
1798                 count_data++;
1799         }
1800
1801         /* Locate record for the first record on track 2. */
1802         ccw[-1].flags |= CCW_FLAG_CC;
1803         locate_record(ccw++, LO_data++, 2, 0, 1,
1804                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1805         /* Read count ccw. */
1806         ccw[-1].flags |= CCW_FLAG_CC;
1807         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1808         ccw->flags = 0;
1809         ccw->count = 8;
1810         ccw->cda = (__u32)(addr_t) count_data;
1811
1812         cqr->block = NULL;
1813         cqr->startdev = device;
1814         cqr->memdev = device;
1815         cqr->retries = 255;
1816         cqr->buildclk = get_clock();
1817         cqr->status = DASD_CQR_FILLED;
1818         return cqr;
1819 }
1820
1821 /* differentiate between 'no record found' and any other error */
1822 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1823 {
1824         char *sense;
1825         if (init_cqr->status == DASD_CQR_DONE)
1826                 return INIT_CQR_OK;
1827         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1828                  init_cqr->status == DASD_CQR_FAILED) {
1829                 sense = dasd_get_sense(&init_cqr->irb);
1830                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1831                         return INIT_CQR_UNFORMATTED;
1832                 else
1833                         return INIT_CQR_ERROR;
1834         } else
1835                 return INIT_CQR_ERROR;
1836 }
1837
1838 /*
1839  * This is the callback function for the init_analysis cqr. It saves
1840  * the status of the initial analysis ccw before it frees it and kicks
1841  * the device to continue the startup sequence. This will call
1842  * dasd_eckd_do_analysis again (if the devices has not been marked
1843  * for deletion in the meantime).
1844  */
1845 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1846                                         void *data)
1847 {
1848         struct dasd_eckd_private *private;
1849         struct dasd_device *device;
1850
1851         device = init_cqr->startdev;
1852         private = (struct dasd_eckd_private *) device->private;
1853         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1854         dasd_sfree_request(init_cqr, device);
1855         dasd_kick_device(device);
1856 }
1857
1858 static int dasd_eckd_start_analysis(struct dasd_block *block)
1859 {
1860         struct dasd_ccw_req *init_cqr;
1861
1862         init_cqr = dasd_eckd_analysis_ccw(block->base);
1863         if (IS_ERR(init_cqr))
1864                 return PTR_ERR(init_cqr);
1865         init_cqr->callback = dasd_eckd_analysis_callback;
1866         init_cqr->callback_data = NULL;
1867         init_cqr->expires = 5*HZ;
1868         /* first try without ERP, so we can later handle unformatted
1869          * devices as special case
1870          */
1871         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1872         init_cqr->retries = 0;
1873         dasd_add_request_head(init_cqr);
1874         return -EAGAIN;
1875 }
1876
1877 static int dasd_eckd_end_analysis(struct dasd_block *block)
1878 {
1879         struct dasd_device *device;
1880         struct dasd_eckd_private *private;
1881         struct eckd_count *count_area;
1882         unsigned int sb, blk_per_trk;
1883         int status, i;
1884         struct dasd_ccw_req *init_cqr;
1885
1886         device = block->base;
1887         private = (struct dasd_eckd_private *) device->private;
1888         status = private->init_cqr_status;
1889         private->init_cqr_status = -1;
1890         if (status == INIT_CQR_ERROR) {
1891                 /* try again, this time with full ERP */
1892                 init_cqr = dasd_eckd_analysis_ccw(device);
1893                 dasd_sleep_on(init_cqr);
1894                 status = dasd_eckd_analysis_evaluation(init_cqr);
1895                 dasd_sfree_request(init_cqr, device);
1896         }
1897
1898         if (device->features & DASD_FEATURE_USERAW) {
1899                 block->bp_block = DASD_RAW_BLOCKSIZE;
1900                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1901                 block->s2b_shift = 3;
1902                 goto raw;
1903         }
1904
1905         if (status == INIT_CQR_UNFORMATTED) {
1906                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1907                 return -EMEDIUMTYPE;
1908         } else if (status == INIT_CQR_ERROR) {
1909                 dev_err(&device->cdev->dev,
1910                         "Detecting the DASD disk layout failed because "
1911                         "of an I/O error\n");
1912                 return -EIO;
1913         }
1914
1915         private->uses_cdl = 1;
1916         /* Check Track 0 for Compatible Disk Layout */
1917         count_area = NULL;
1918         for (i = 0; i < 3; i++) {
1919                 if (private->count_area[i].kl != 4 ||
1920                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4) {
1921                         private->uses_cdl = 0;
1922                         break;
1923                 }
1924         }
1925         if (i == 3)
1926                 count_area = &private->count_area[4];
1927
1928         if (private->uses_cdl == 0) {
1929                 for (i = 0; i < 5; i++) {
1930                         if ((private->count_area[i].kl != 0) ||
1931                             (private->count_area[i].dl !=
1932                              private->count_area[0].dl))
1933                                 break;
1934                 }
1935                 if (i == 5)
1936                         count_area = &private->count_area[0];
1937         } else {
1938                 if (private->count_area[3].record == 1)
1939                         dev_warn(&device->cdev->dev,
1940                                  "Track 0 has no records following the VTOC\n");
1941         }
1942
1943         if (count_area != NULL && count_area->kl == 0) {
1944                 /* we found notthing violating our disk layout */
1945                 if (dasd_check_blocksize(count_area->dl) == 0)
1946                         block->bp_block = count_area->dl;
1947         }
1948         if (block->bp_block == 0) {
1949                 dev_warn(&device->cdev->dev,
1950                          "The disk layout of the DASD is not supported\n");
1951                 return -EMEDIUMTYPE;
1952         }
1953         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1954         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1955                 block->s2b_shift++;
1956
1957         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
1958
1959 raw:
1960         block->blocks = (private->real_cyl *
1961                           private->rdc_data.trk_per_cyl *
1962                           blk_per_trk);
1963
1964         dev_info(&device->cdev->dev,
1965                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
1966                  "%s\n", (block->bp_block >> 10),
1967                  ((private->real_cyl *
1968                    private->rdc_data.trk_per_cyl *
1969                    blk_per_trk * (block->bp_block >> 9)) >> 1),
1970                  ((blk_per_trk * block->bp_block) >> 10),
1971                  private->uses_cdl ?
1972                  "compatible disk layout" : "linux disk layout");
1973
1974         return 0;
1975 }
1976
1977 static int dasd_eckd_do_analysis(struct dasd_block *block)
1978 {
1979         struct dasd_eckd_private *private;
1980
1981         private = (struct dasd_eckd_private *) block->base->private;
1982         if (private->init_cqr_status < 0)
1983                 return dasd_eckd_start_analysis(block);
1984         else
1985                 return dasd_eckd_end_analysis(block);
1986 }
1987
1988 static int dasd_eckd_ready_to_online(struct dasd_device *device)
1989 {
1990         return dasd_alias_add_device(device);
1991 };
1992
1993 static int dasd_eckd_online_to_ready(struct dasd_device *device)
1994 {
1995         cancel_work_sync(&device->reload_device);
1996         return dasd_alias_remove_device(device);
1997 };
1998
1999 static int
2000 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2001 {
2002         struct dasd_eckd_private *private;
2003
2004         private = (struct dasd_eckd_private *) block->base->private;
2005         if (dasd_check_blocksize(block->bp_block) == 0) {
2006                 geo->sectors = recs_per_track(&private->rdc_data,
2007                                               0, block->bp_block);
2008         }
2009         geo->cylinders = private->rdc_data.no_cyl;
2010         geo->heads = private->rdc_data.trk_per_cyl;
2011         return 0;
2012 }
2013
2014 static struct dasd_ccw_req *
2015 dasd_eckd_format_device(struct dasd_device * device,
2016                         struct format_data_t * fdata)
2017 {
2018         struct dasd_eckd_private *private;
2019         struct dasd_ccw_req *fcp;
2020         struct eckd_count *ect;
2021         struct ccw1 *ccw;
2022         void *data;
2023         int rpt;
2024         struct ch_t address;
2025         int cplength, datasize;
2026         int i;
2027         int intensity = 0;
2028         int r0_perm;
2029
2030         private = (struct dasd_eckd_private *) device->private;
2031         rpt = recs_per_track(&private->rdc_data, 0, fdata->blksize);
2032         set_ch_t(&address,
2033                  fdata->start_unit / private->rdc_data.trk_per_cyl,
2034                  fdata->start_unit % private->rdc_data.trk_per_cyl);
2035
2036         /* Sanity checks. */
2037         if (fdata->start_unit >=
2038             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2039                 dev_warn(&device->cdev->dev, "Start track number %d used in "
2040                          "formatting is too big\n", fdata->start_unit);
2041                 return ERR_PTR(-EINVAL);
2042         }
2043         if (fdata->start_unit > fdata->stop_unit) {
2044                 dev_warn(&device->cdev->dev, "Start track %d used in "
2045                          "formatting exceeds end track\n", fdata->start_unit);
2046                 return ERR_PTR(-EINVAL);
2047         }
2048         if (dasd_check_blocksize(fdata->blksize) != 0) {
2049                 dev_warn(&device->cdev->dev,
2050                          "The DASD cannot be formatted with block size %d\n",
2051                          fdata->blksize);
2052                 return ERR_PTR(-EINVAL);
2053         }
2054
2055         /*
2056          * fdata->intensity is a bit string that tells us what to do:
2057          *   Bit 0: write record zero
2058          *   Bit 1: write home address, currently not supported
2059          *   Bit 2: invalidate tracks
2060          *   Bit 3: use OS/390 compatible disk layout (cdl)
2061          *   Bit 4: do not allow storage subsystem to modify record zero
2062          * Only some bit combinations do make sense.
2063          */
2064         if (fdata->intensity & 0x10) {
2065                 r0_perm = 0;
2066                 intensity = fdata->intensity & ~0x10;
2067         } else {
2068                 r0_perm = 1;
2069                 intensity = fdata->intensity;
2070         }
2071         switch (intensity) {
2072         case 0x00:      /* Normal format */
2073         case 0x08:      /* Normal format, use cdl. */
2074                 cplength = 2 + rpt;
2075                 datasize = sizeof(struct DE_eckd_data) +
2076                         sizeof(struct LO_eckd_data) +
2077                         rpt * sizeof(struct eckd_count);
2078                 break;
2079         case 0x01:      /* Write record zero and format track. */
2080         case 0x09:      /* Write record zero and format track, use cdl. */
2081                 cplength = 3 + rpt;
2082                 datasize = sizeof(struct DE_eckd_data) +
2083                         sizeof(struct LO_eckd_data) +
2084                         sizeof(struct eckd_count) +
2085                         rpt * sizeof(struct eckd_count);
2086                 break;
2087         case 0x04:      /* Invalidate track. */
2088         case 0x0c:      /* Invalidate track, use cdl. */
2089                 cplength = 3;
2090                 datasize = sizeof(struct DE_eckd_data) +
2091                         sizeof(struct LO_eckd_data) +
2092                         sizeof(struct eckd_count);
2093                 break;
2094         default:
2095                 dev_warn(&device->cdev->dev, "An I/O control call used "
2096                          "incorrect flags 0x%x\n", fdata->intensity);
2097                 return ERR_PTR(-EINVAL);
2098         }
2099         /* Allocate the format ccw request. */
2100         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
2101         if (IS_ERR(fcp))
2102                 return fcp;
2103
2104         data = fcp->data;
2105         ccw = fcp->cpaddr;
2106
2107         switch (intensity & ~0x08) {
2108         case 0x00: /* Normal format. */
2109                 define_extent(ccw++, (struct DE_eckd_data *) data,
2110                               fdata->start_unit, fdata->start_unit,
2111                               DASD_ECKD_CCW_WRITE_CKD, device);
2112                 /* grant subsystem permission to format R0 */
2113                 if (r0_perm)
2114                         ((struct DE_eckd_data *)data)->ga_extended |= 0x04;
2115                 data += sizeof(struct DE_eckd_data);
2116                 ccw[-1].flags |= CCW_FLAG_CC;
2117                 locate_record(ccw++, (struct LO_eckd_data *) data,
2118                               fdata->start_unit, 0, rpt,
2119                               DASD_ECKD_CCW_WRITE_CKD, device,
2120                               fdata->blksize);
2121                 data += sizeof(struct LO_eckd_data);
2122                 break;
2123         case 0x01: /* Write record zero + format track. */
2124                 define_extent(ccw++, (struct DE_eckd_data *) data,
2125                               fdata->start_unit, fdata->start_unit,
2126                               DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2127                               device);
2128                 data += sizeof(struct DE_eckd_data);
2129                 ccw[-1].flags |= CCW_FLAG_CC;
2130                 locate_record(ccw++, (struct LO_eckd_data *) data,
2131                               fdata->start_unit, 0, rpt + 1,
2132                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, device,
2133                               device->block->bp_block);
2134                 data += sizeof(struct LO_eckd_data);
2135                 break;
2136         case 0x04: /* Invalidate track. */
2137                 define_extent(ccw++, (struct DE_eckd_data *) data,
2138                               fdata->start_unit, fdata->start_unit,
2139                               DASD_ECKD_CCW_WRITE_CKD, device);
2140                 data += sizeof(struct DE_eckd_data);
2141                 ccw[-1].flags |= CCW_FLAG_CC;
2142                 locate_record(ccw++, (struct LO_eckd_data *) data,
2143                               fdata->start_unit, 0, 1,
2144                               DASD_ECKD_CCW_WRITE_CKD, device, 8);
2145                 data += sizeof(struct LO_eckd_data);
2146                 break;
2147         }
2148         if (intensity & 0x01) { /* write record zero */
2149                 ect = (struct eckd_count *) data;
2150                 data += sizeof(struct eckd_count);
2151                 ect->cyl = address.cyl;
2152                 ect->head = address.head;
2153                 ect->record = 0;
2154                 ect->kl = 0;
2155                 ect->dl = 8;
2156                 ccw[-1].flags |= CCW_FLAG_CC;
2157                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2158                 ccw->flags = CCW_FLAG_SLI;
2159                 ccw->count = 8;
2160                 ccw->cda = (__u32)(addr_t) ect;
2161                 ccw++;
2162         }
2163         if ((intensity & ~0x08) & 0x04) {       /* erase track */
2164                 ect = (struct eckd_count *) data;
2165                 data += sizeof(struct eckd_count);
2166                 ect->cyl = address.cyl;
2167                 ect->head = address.head;
2168                 ect->record = 1;
2169                 ect->kl = 0;
2170                 ect->dl = 0;
2171                 ccw[-1].flags |= CCW_FLAG_CC;
2172                 ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2173                 ccw->flags = CCW_FLAG_SLI;
2174                 ccw->count = 8;
2175                 ccw->cda = (__u32)(addr_t) ect;
2176         } else {                /* write remaining records */
2177                 for (i = 0; i < rpt; i++) {
2178                         ect = (struct eckd_count *) data;
2179                         data += sizeof(struct eckd_count);
2180                         ect->cyl = address.cyl;
2181                         ect->head = address.head;
2182                         ect->record = i + 1;
2183                         ect->kl = 0;
2184                         ect->dl = fdata->blksize;
2185                         /* Check for special tracks 0-1 when formatting CDL */
2186                         if ((intensity & 0x08) &&
2187                             fdata->start_unit == 0) {
2188                                 if (i < 3) {
2189                                         ect->kl = 4;
2190                                         ect->dl = sizes_trk0[i] - 4;
2191                                 }
2192                         }
2193                         if ((intensity & 0x08) &&
2194                             fdata->start_unit == 1) {
2195                                 ect->kl = 44;
2196                                 ect->dl = LABEL_SIZE - 44;
2197                         }
2198                         ccw[-1].flags |= CCW_FLAG_CC;
2199                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2200                         ccw->flags = CCW_FLAG_SLI;
2201                         ccw->count = 8;
2202                         ccw->cda = (__u32)(addr_t) ect;
2203                         ccw++;
2204                 }
2205         }
2206         fcp->startdev = device;
2207         fcp->memdev = device;
2208         fcp->retries = 256;
2209         fcp->buildclk = get_clock();
2210         fcp->status = DASD_CQR_FILLED;
2211         return fcp;
2212 }
2213
2214 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2215 {
2216         cqr->status = DASD_CQR_FILLED;
2217         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2218                 dasd_eckd_reset_ccw_to_base_io(cqr);
2219                 cqr->startdev = cqr->block->base;
2220                 cqr->lpm = cqr->block->base->path_data.opm;
2221         }
2222 };
2223
2224 static dasd_erp_fn_t
2225 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2226 {
2227         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2228         struct ccw_device *cdev = device->cdev;
2229
2230         switch (cdev->id.cu_type) {
2231         case 0x3990:
2232         case 0x2105:
2233         case 0x2107:
2234         case 0x1750:
2235                 return dasd_3990_erp_action;
2236         case 0x9343:
2237         case 0x3880:
2238         default:
2239                 return dasd_default_erp_action;
2240         }
2241 }
2242
2243 static dasd_erp_fn_t
2244 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2245 {
2246         return dasd_default_erp_postaction;
2247 }
2248
2249 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2250                                               struct dasd_ccw_req *cqr,
2251                                               struct irb *irb)
2252 {
2253         char mask;
2254         char *sense = NULL;
2255         struct dasd_eckd_private *private;
2256
2257         private = (struct dasd_eckd_private *) device->private;
2258         /* first of all check for state change pending interrupt */
2259         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2260         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2261                 /*
2262                  * for alias only, not in offline processing
2263                  * and only if not suspended
2264                  */
2265                 if (!device->block && private->lcu &&
2266                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2267                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2268                         /*
2269                          * the state change could be caused by an alias
2270                          * reassignment remove device from alias handling
2271                          * to prevent new requests from being scheduled on
2272                          * the wrong alias device
2273                          */
2274                         dasd_alias_remove_device(device);
2275
2276                         /* schedule worker to reload device */
2277                         dasd_reload_device(device);
2278                 }
2279                 dasd_generic_handle_state_change(device);
2280                 return;
2281         }
2282
2283         sense = dasd_get_sense(irb);
2284         if (!sense)
2285                 return;
2286
2287         /* summary unit check */
2288         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2289             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2290                 dasd_alias_handle_summary_unit_check(device, irb);
2291                 return;
2292         }
2293
2294         /* service information message SIM */
2295         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2296             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2297                 dasd_3990_erp_handle_sim(device, sense);
2298                 return;
2299         }
2300
2301         /* loss of device reservation is handled via base devices only
2302          * as alias devices may be used with several bases
2303          */
2304         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2305             (sense[7] == 0x3F) &&
2306             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2307             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2308                 if (device->features & DASD_FEATURE_FAILONSLCK)
2309                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2310                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2311                 dev_err(&device->cdev->dev,
2312                         "The device reservation was lost\n");
2313         }
2314 }
2315
2316 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2317                                                struct dasd_device *startdev,
2318                                                struct dasd_block *block,
2319                                                struct request *req,
2320                                                sector_t first_rec,
2321                                                sector_t last_rec,
2322                                                sector_t first_trk,
2323                                                sector_t last_trk,
2324                                                unsigned int first_offs,
2325                                                unsigned int last_offs,
2326                                                unsigned int blk_per_trk,
2327                                                unsigned int blksize)
2328 {
2329         struct dasd_eckd_private *private;
2330         unsigned long *idaws;
2331         struct LO_eckd_data *LO_data;
2332         struct dasd_ccw_req *cqr;
2333         struct ccw1 *ccw;
2334         struct req_iterator iter;
2335         struct bio_vec *bv;
2336         char *dst;
2337         unsigned int off;
2338         int count, cidaw, cplength, datasize;
2339         sector_t recid;
2340         unsigned char cmd, rcmd;
2341         int use_prefix;
2342         struct dasd_device *basedev;
2343
2344         basedev = block->base;
2345         private = (struct dasd_eckd_private *) basedev->private;
2346         if (rq_data_dir(req) == READ)
2347                 cmd = DASD_ECKD_CCW_READ_MT;
2348         else if (rq_data_dir(req) == WRITE)
2349                 cmd = DASD_ECKD_CCW_WRITE_MT;
2350         else
2351                 return ERR_PTR(-EINVAL);
2352
2353         /* Check struct bio and count the number of blocks for the request. */
2354         count = 0;
2355         cidaw = 0;
2356         rq_for_each_segment(bv, req, iter) {
2357                 if (bv->bv_len & (blksize - 1))
2358                         /* Eckd can only do full blocks. */
2359                         return ERR_PTR(-EINVAL);
2360                 count += bv->bv_len >> (block->s2b_shift + 9);
2361 #if defined(CONFIG_64BIT)
2362                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
2363                         cidaw += bv->bv_len >> (block->s2b_shift + 9);
2364 #endif
2365         }
2366         /* Paranoia. */
2367         if (count != last_rec - first_rec + 1)
2368                 return ERR_PTR(-EINVAL);
2369
2370         /* use the prefix command if available */
2371         use_prefix = private->features.feature[8] & 0x01;
2372         if (use_prefix) {
2373                 /* 1x prefix + number of blocks */
2374                 cplength = 2 + count;
2375                 /* 1x prefix + cidaws*sizeof(long) */
2376                 datasize = sizeof(struct PFX_eckd_data) +
2377                         sizeof(struct LO_eckd_data) +
2378                         cidaw * sizeof(unsigned long);
2379         } else {
2380                 /* 1x define extent + 1x locate record + number of blocks */
2381                 cplength = 2 + count;
2382                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2383                 datasize = sizeof(struct DE_eckd_data) +
2384                         sizeof(struct LO_eckd_data) +
2385                         cidaw * sizeof(unsigned long);
2386         }
2387         /* Find out the number of additional locate record ccws for cdl. */
2388         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2389                 if (last_rec >= 2*blk_per_trk)
2390                         count = 2*blk_per_trk - first_rec;
2391                 cplength += count;
2392                 datasize += count*sizeof(struct LO_eckd_data);
2393         }
2394         /* Allocate the ccw request. */
2395         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2396                                    startdev);
2397         if (IS_ERR(cqr))
2398                 return cqr;
2399         ccw = cqr->cpaddr;
2400         /* First ccw is define extent or prefix. */
2401         if (use_prefix) {
2402                 if (prefix(ccw++, cqr->data, first_trk,
2403                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2404                         /* Clock not in sync and XRC is enabled.
2405                          * Try again later.
2406                          */
2407                         dasd_sfree_request(cqr, startdev);
2408                         return ERR_PTR(-EAGAIN);
2409                 }
2410                 idaws = (unsigned long *) (cqr->data +
2411                                            sizeof(struct PFX_eckd_data));
2412         } else {
2413                 if (define_extent(ccw++, cqr->data, first_trk,
2414                                   last_trk, cmd, basedev) == -EAGAIN) {
2415                         /* Clock not in sync and XRC is enabled.
2416                          * Try again later.
2417                          */
2418                         dasd_sfree_request(cqr, startdev);
2419                         return ERR_PTR(-EAGAIN);
2420                 }
2421                 idaws = (unsigned long *) (cqr->data +
2422                                            sizeof(struct DE_eckd_data));
2423         }
2424         /* Build locate_record+read/write/ccws. */
2425         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2426         recid = first_rec;
2427         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2428                 /* Only standard blocks so there is just one locate record. */
2429                 ccw[-1].flags |= CCW_FLAG_CC;
2430                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2431                               last_rec - recid + 1, cmd, basedev, blksize);
2432         }
2433         rq_for_each_segment(bv, req, iter) {
2434                 dst = page_address(bv->bv_page) + bv->bv_offset;
2435                 if (dasd_page_cache) {
2436                         char *copy = kmem_cache_alloc(dasd_page_cache,
2437                                                       GFP_DMA | __GFP_NOWARN);
2438                         if (copy && rq_data_dir(req) == WRITE)
2439                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
2440                         if (copy)
2441                                 dst = copy + bv->bv_offset;
2442                 }
2443                 for (off = 0; off < bv->bv_len; off += blksize) {
2444                         sector_t trkid = recid;
2445                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2446                         rcmd = cmd;
2447                         count = blksize;
2448                         /* Locate record for cdl special block ? */
2449                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2450                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2451                                         rcmd |= 0x8;
2452                                         count = dasd_eckd_cdl_reclen(recid);
2453                                         if (count < blksize &&
2454                                             rq_data_dir(req) == READ)
2455                                                 memset(dst + count, 0xe5,
2456                                                        blksize - count);
2457                                 }
2458                                 ccw[-1].flags |= CCW_FLAG_CC;
2459                                 locate_record(ccw++, LO_data++,
2460                                               trkid, recoffs + 1,
2461                                               1, rcmd, basedev, count);
2462                         }
2463                         /* Locate record for standard blocks ? */
2464                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2465                                 ccw[-1].flags |= CCW_FLAG_CC;
2466                                 locate_record(ccw++, LO_data++,
2467                                               trkid, recoffs + 1,
2468                                               last_rec - recid + 1,
2469                                               cmd, basedev, count);
2470                         }
2471                         /* Read/write ccw. */
2472                         ccw[-1].flags |= CCW_FLAG_CC;
2473                         ccw->cmd_code = rcmd;
2474                         ccw->count = count;
2475                         if (idal_is_needed(dst, blksize)) {
2476                                 ccw->cda = (__u32)(addr_t) idaws;
2477                                 ccw->flags = CCW_FLAG_IDA;
2478                                 idaws = idal_create_words(idaws, dst, blksize);
2479                         } else {
2480                                 ccw->cda = (__u32)(addr_t) dst;
2481                                 ccw->flags = 0;
2482                         }
2483                         ccw++;
2484                         dst += blksize;
2485                         recid++;
2486                 }
2487         }
2488         if (blk_noretry_request(req) ||
2489             block->base->features & DASD_FEATURE_FAILFAST)
2490                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2491         cqr->startdev = startdev;
2492         cqr->memdev = startdev;
2493         cqr->block = block;
2494         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2495         cqr->lpm = startdev->path_data.ppm;
2496         cqr->retries = 256;
2497         cqr->buildclk = get_clock();
2498         cqr->status = DASD_CQR_FILLED;
2499         return cqr;
2500 }
2501
2502 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2503                                                struct dasd_device *startdev,
2504                                                struct dasd_block *block,
2505                                                struct request *req,
2506                                                sector_t first_rec,
2507                                                sector_t last_rec,
2508                                                sector_t first_trk,
2509                                                sector_t last_trk,
2510                                                unsigned int first_offs,
2511                                                unsigned int last_offs,
2512                                                unsigned int blk_per_trk,
2513                                                unsigned int blksize)
2514 {
2515         unsigned long *idaws;
2516         struct dasd_ccw_req *cqr;
2517         struct ccw1 *ccw;
2518         struct req_iterator iter;
2519         struct bio_vec *bv;
2520         char *dst, *idaw_dst;
2521         unsigned int cidaw, cplength, datasize;
2522         unsigned int tlf;
2523         sector_t recid;
2524         unsigned char cmd;
2525         struct dasd_device *basedev;
2526         unsigned int trkcount, count, count_to_trk_end;
2527         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2528         unsigned char new_track, end_idaw;
2529         sector_t trkid;
2530         unsigned int recoffs;
2531
2532         basedev = block->base;
2533         if (rq_data_dir(req) == READ)
2534                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2535         else if (rq_data_dir(req) == WRITE)
2536                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2537         else
2538                 return ERR_PTR(-EINVAL);
2539
2540         /* Track based I/O needs IDAWs for each page, and not just for
2541          * 64 bit addresses. We need additional idals for pages
2542          * that get filled from two tracks, so we use the number
2543          * of records as upper limit.
2544          */
2545         cidaw = last_rec - first_rec + 1;
2546         trkcount = last_trk - first_trk + 1;
2547
2548         /* 1x prefix + one read/write ccw per track */
2549         cplength = 1 + trkcount;
2550
2551         /* on 31-bit we need space for two 32 bit addresses per page
2552          * on 64-bit one 64 bit address
2553          */
2554         datasize = sizeof(struct PFX_eckd_data) +
2555                 cidaw * sizeof(unsigned long long);
2556
2557         /* Allocate the ccw request. */
2558         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2559                                    startdev);
2560         if (IS_ERR(cqr))
2561                 return cqr;
2562         ccw = cqr->cpaddr;
2563         /* transfer length factor: how many bytes to read from the last track */
2564         if (first_trk == last_trk)
2565                 tlf = last_offs - first_offs + 1;
2566         else
2567                 tlf = last_offs + 1;
2568         tlf *= blksize;
2569
2570         if (prefix_LRE(ccw++, cqr->data, first_trk,
2571                        last_trk, cmd, basedev, startdev,
2572                        1 /* format */, first_offs + 1,
2573                        trkcount, blksize,
2574                        tlf) == -EAGAIN) {
2575                 /* Clock not in sync and XRC is enabled.
2576                  * Try again later.
2577                  */
2578                 dasd_sfree_request(cqr, startdev);
2579                 return ERR_PTR(-EAGAIN);
2580         }
2581
2582         /*
2583          * The translation of request into ccw programs must meet the
2584          * following conditions:
2585          * - all idaws but the first and the last must address full pages
2586          *   (or 2K blocks on 31-bit)
2587          * - the scope of a ccw and it's idal ends with the track boundaries
2588          */
2589         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2590         recid = first_rec;
2591         new_track = 1;
2592         end_idaw = 0;
2593         len_to_track_end = 0;
2594         idaw_dst = NULL;
2595         idaw_len = 0;
2596         rq_for_each_segment(bv, req, iter) {
2597                 dst = page_address(bv->bv_page) + bv->bv_offset;
2598                 seg_len = bv->bv_len;
2599                 while (seg_len) {
2600                         if (new_track) {
2601                                 trkid = recid;
2602                                 recoffs = sector_div(trkid, blk_per_trk);
2603                                 count_to_trk_end = blk_per_trk - recoffs;
2604                                 count = min((last_rec - recid + 1),
2605                                             (sector_t)count_to_trk_end);
2606                                 len_to_track_end = count * blksize;
2607                                 ccw[-1].flags |= CCW_FLAG_CC;
2608                                 ccw->cmd_code = cmd;
2609                                 ccw->count = len_to_track_end;
2610                                 ccw->cda = (__u32)(addr_t)idaws;
2611                                 ccw->flags = CCW_FLAG_IDA;
2612                                 ccw++;
2613                                 recid += count;
2614                                 new_track = 0;
2615                                 /* first idaw for a ccw may start anywhere */
2616                                 if (!idaw_dst)
2617                                         idaw_dst = dst;
2618                         }
2619                         /* If we start a new idaw, we must make sure that it
2620                          * starts on an IDA_BLOCK_SIZE boundary.
2621                          * If we continue an idaw, we must make sure that the
2622                          * current segment begins where the so far accumulated
2623                          * idaw ends
2624                          */
2625                         if (!idaw_dst) {
2626                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2627                                         dasd_sfree_request(cqr, startdev);
2628                                         return ERR_PTR(-ERANGE);
2629                                 } else
2630                                         idaw_dst = dst;
2631                         }
2632                         if ((idaw_dst + idaw_len) != dst) {
2633                                 dasd_sfree_request(cqr, startdev);
2634                                 return ERR_PTR(-ERANGE);
2635                         }
2636                         part_len = min(seg_len, len_to_track_end);
2637                         seg_len -= part_len;
2638                         dst += part_len;
2639                         idaw_len += part_len;
2640                         len_to_track_end -= part_len;
2641                         /* collected memory area ends on an IDA_BLOCK border,
2642                          * -> create an idaw
2643                          * idal_create_words will handle cases where idaw_len
2644                          * is larger then IDA_BLOCK_SIZE
2645                          */
2646                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2647                                 end_idaw = 1;
2648                         /* We also need to end the idaw at track end */
2649                         if (!len_to_track_end) {
2650                                 new_track = 1;
2651                                 end_idaw = 1;
2652                         }
2653                         if (end_idaw) {
2654                                 idaws = idal_create_words(idaws, idaw_dst,
2655                                                           idaw_len);
2656                                 idaw_dst = NULL;
2657                                 idaw_len = 0;
2658                                 end_idaw = 0;
2659                         }
2660                 }
2661         }
2662
2663         if (blk_noretry_request(req) ||
2664             block->base->features & DASD_FEATURE_FAILFAST)
2665                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2666         cqr->startdev = startdev;
2667         cqr->memdev = startdev;
2668         cqr->block = block;
2669         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2670         cqr->lpm = startdev->path_data.ppm;
2671         cqr->retries = 256;
2672         cqr->buildclk = get_clock();
2673         cqr->status = DASD_CQR_FILLED;
2674         return cqr;
2675 }
2676
2677 static int prepare_itcw(struct itcw *itcw,
2678                         unsigned int trk, unsigned int totrk, int cmd,
2679                         struct dasd_device *basedev,
2680                         struct dasd_device *startdev,
2681                         unsigned int rec_on_trk, int count,
2682                         unsigned int blksize,
2683                         unsigned int total_data_size,
2684                         unsigned int tlf,
2685                         unsigned int blk_per_trk)
2686 {
2687         struct PFX_eckd_data pfxdata;
2688         struct dasd_eckd_private *basepriv, *startpriv;
2689         struct DE_eckd_data *dedata;
2690         struct LRE_eckd_data *lredata;
2691         struct dcw *dcw;
2692
2693         u32 begcyl, endcyl;
2694         u16 heads, beghead, endhead;
2695         u8 pfx_cmd;
2696
2697         int rc = 0;
2698         int sector = 0;
2699         int dn, d;
2700
2701
2702         /* setup prefix data */
2703         basepriv = (struct dasd_eckd_private *) basedev->private;
2704         startpriv = (struct dasd_eckd_private *) startdev->private;
2705         dedata = &pfxdata.define_extent;
2706         lredata = &pfxdata.locate_record;
2707
2708         memset(&pfxdata, 0, sizeof(pfxdata));
2709         pfxdata.format = 1; /* PFX with LRE */
2710         pfxdata.base_address = basepriv->ned->unit_addr;
2711         pfxdata.base_lss = basepriv->ned->ID;
2712         pfxdata.validity.define_extent = 1;
2713
2714         /* private uid is kept up to date, conf_data may be outdated */
2715         if (startpriv->uid.type != UA_BASE_DEVICE) {
2716                 pfxdata.validity.verify_base = 1;
2717                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
2718                         pfxdata.validity.hyper_pav = 1;
2719         }
2720
2721         switch (cmd) {
2722         case DASD_ECKD_CCW_READ_TRACK_DATA:
2723                 dedata->mask.perm = 0x1;
2724                 dedata->attributes.operation = basepriv->attrib.operation;
2725                 dedata->blk_size = blksize;
2726                 dedata->ga_extended |= 0x42;
2727                 lredata->operation.orientation = 0x0;
2728                 lredata->operation.operation = 0x0C;
2729                 lredata->auxiliary.check_bytes = 0x01;
2730                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
2731                 break;
2732         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
2733                 dedata->mask.perm = 0x02;
2734                 dedata->attributes.operation = basepriv->attrib.operation;
2735                 dedata->blk_size = blksize;
2736                 rc = check_XRC_on_prefix(&pfxdata, basedev);
2737                 dedata->ga_extended |= 0x42;
2738                 lredata->operation.orientation = 0x0;
2739                 lredata->operation.operation = 0x3F;
2740                 lredata->extended_operation = 0x23;
2741                 lredata->auxiliary.check_bytes = 0x2;
2742                 pfx_cmd = DASD_ECKD_CCW_PFX;
2743                 break;
2744         default:
2745                 DBF_DEV_EVENT(DBF_ERR, basedev,
2746                               "prepare itcw, unknown opcode 0x%x", cmd);
2747                 BUG();
2748                 break;
2749         }
2750         if (rc)
2751                 return rc;
2752
2753         dedata->attributes.mode = 0x3;  /* ECKD */
2754
2755         heads = basepriv->rdc_data.trk_per_cyl;
2756         begcyl = trk / heads;
2757         beghead = trk % heads;
2758         endcyl = totrk / heads;
2759         endhead = totrk % heads;
2760
2761         /* check for sequential prestage - enhance cylinder range */
2762         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
2763             dedata->attributes.operation == DASD_SEQ_ACCESS) {
2764
2765                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
2766                         endcyl += basepriv->attrib.nr_cyl;
2767                 else
2768                         endcyl = (basepriv->real_cyl - 1);
2769         }
2770
2771         set_ch_t(&dedata->beg_ext, begcyl, beghead);
2772         set_ch_t(&dedata->end_ext, endcyl, endhead);
2773
2774         dedata->ep_format = 0x20; /* records per track is valid */
2775         dedata->ep_rec_per_track = blk_per_trk;
2776
2777         if (rec_on_trk) {
2778                 switch (basepriv->rdc_data.dev_type) {
2779                 case 0x3390:
2780                         dn = ceil_quot(blksize + 6, 232);
2781                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
2782                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
2783                         break;
2784                 case 0x3380:
2785                         d = 7 + ceil_quot(blksize + 12, 32);
2786                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
2787                         break;
2788                 }
2789         }
2790
2791         lredata->auxiliary.length_valid = 1;
2792         lredata->auxiliary.length_scope = 1;
2793         lredata->auxiliary.imbedded_ccw_valid = 1;
2794         lredata->length = tlf;
2795         lredata->imbedded_ccw = cmd;
2796         lredata->count = count;
2797         lredata->sector = sector;
2798         set_ch_t(&lredata->seek_addr, begcyl, beghead);
2799         lredata->search_arg.cyl = lredata->seek_addr.cyl;
2800         lredata->search_arg.head = lredata->seek_addr.head;
2801         lredata->search_arg.record = rec_on_trk;
2802
2803         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
2804                      &pfxdata, sizeof(pfxdata), total_data_size);
2805         return IS_ERR(dcw) ? PTR_ERR(dcw) : 0;
2806 }
2807
2808 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
2809                                                struct dasd_device *startdev,
2810                                                struct dasd_block *block,
2811                                                struct request *req,
2812                                                sector_t first_rec,
2813                                                sector_t last_rec,
2814                                                sector_t first_trk,
2815                                                sector_t last_trk,
2816                                                unsigned int first_offs,
2817                                                unsigned int last_offs,
2818                                                unsigned int blk_per_trk,
2819                                                unsigned int blksize)
2820 {
2821         struct dasd_ccw_req *cqr;
2822         struct req_iterator iter;
2823         struct bio_vec *bv;
2824         char *dst;
2825         unsigned int trkcount, ctidaw;
2826         unsigned char cmd;
2827         struct dasd_device *basedev;
2828         unsigned int tlf;
2829         struct itcw *itcw;
2830         struct tidaw *last_tidaw = NULL;
2831         int itcw_op;
2832         size_t itcw_size;
2833         u8 tidaw_flags;
2834         unsigned int seg_len, part_len, len_to_track_end;
2835         unsigned char new_track;
2836         sector_t recid, trkid;
2837         unsigned int offs;
2838         unsigned int count, count_to_trk_end;
2839
2840         basedev = block->base;
2841         if (rq_data_dir(req) == READ) {
2842                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2843                 itcw_op = ITCW_OP_READ;
2844         } else if (rq_data_dir(req) == WRITE) {
2845                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2846                 itcw_op = ITCW_OP_WRITE;
2847         } else
2848                 return ERR_PTR(-EINVAL);
2849
2850         /* trackbased I/O needs address all memory via TIDAWs,
2851          * not just for 64 bit addresses. This allows us to map
2852          * each segment directly to one tidaw.
2853          * In the case of write requests, additional tidaws may
2854          * be needed when a segment crosses a track boundary.
2855          */
2856         trkcount = last_trk - first_trk + 1;
2857         ctidaw = 0;
2858         rq_for_each_segment(bv, req, iter) {
2859                 ++ctidaw;
2860         }
2861         if (rq_data_dir(req) == WRITE)
2862                 ctidaw += (last_trk - first_trk);
2863
2864         /* Allocate the ccw request. */
2865         itcw_size = itcw_calc_size(0, ctidaw, 0);
2866         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2867         if (IS_ERR(cqr))
2868                 return cqr;
2869
2870         /* transfer length factor: how many bytes to read from the last track */
2871         if (first_trk == last_trk)
2872                 tlf = last_offs - first_offs + 1;
2873         else
2874                 tlf = last_offs + 1;
2875         tlf *= blksize;
2876
2877         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
2878         if (IS_ERR(itcw)) {
2879                 dasd_sfree_request(cqr, startdev);
2880                 return ERR_PTR(-EINVAL);
2881         }
2882         cqr->cpaddr = itcw_get_tcw(itcw);
2883         if (prepare_itcw(itcw, first_trk, last_trk,
2884                          cmd, basedev, startdev,
2885                          first_offs + 1,
2886                          trkcount, blksize,
2887                          (last_rec - first_rec + 1) * blksize,
2888                          tlf, blk_per_trk) == -EAGAIN) {
2889                 /* Clock not in sync and XRC is enabled.
2890                  * Try again later.
2891                  */
2892                 dasd_sfree_request(cqr, startdev);
2893                 return ERR_PTR(-EAGAIN);
2894         }
2895         len_to_track_end = 0;
2896         /*
2897          * A tidaw can address 4k of memory, but must not cross page boundaries
2898          * We can let the block layer handle this by setting
2899          * blk_queue_segment_boundary to page boundaries and
2900          * blk_max_segment_size to page size when setting up the request queue.
2901          * For write requests, a TIDAW must not cross track boundaries, because
2902          * we have to set the CBC flag on the last tidaw for each track.
2903          */
2904         if (rq_data_dir(req) == WRITE) {
2905                 new_track = 1;
2906                 recid = first_rec;
2907                 rq_for_each_segment(bv, req, iter) {
2908                         dst = page_address(bv->bv_page) + bv->bv_offset;
2909                         seg_len = bv->bv_len;
2910                         while (seg_len) {
2911                                 if (new_track) {
2912                                         trkid = recid;
2913                                         offs = sector_div(trkid, blk_per_trk);
2914                                         count_to_trk_end = blk_per_trk - offs;
2915                                         count = min((last_rec - recid + 1),
2916                                                     (sector_t)count_to_trk_end);
2917                                         len_to_track_end = count * blksize;
2918                                         recid += count;
2919                                         new_track = 0;
2920                                 }
2921                                 part_len = min(seg_len, len_to_track_end);
2922                                 seg_len -= part_len;
2923                                 len_to_track_end -= part_len;
2924                                 /* We need to end the tidaw at track end */
2925                                 if (!len_to_track_end) {
2926                                         new_track = 1;
2927                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
2928                                 } else
2929                                         tidaw_flags = 0;
2930                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
2931                                                             dst, part_len);
2932                                 if (IS_ERR(last_tidaw))
2933                                         return ERR_PTR(-EINVAL);
2934                                 dst += part_len;
2935                         }
2936                 }
2937         } else {
2938                 rq_for_each_segment(bv, req, iter) {
2939                         dst = page_address(bv->bv_page) + bv->bv_offset;
2940                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
2941                                                     dst, bv->bv_len);
2942                         if (IS_ERR(last_tidaw))
2943                                 return ERR_PTR(-EINVAL);
2944                 }
2945         }
2946         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2947         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
2948         itcw_finalize(itcw);
2949
2950         if (blk_noretry_request(req) ||
2951             block->base->features & DASD_FEATURE_FAILFAST)
2952                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2953         cqr->cpmode = 1;
2954         cqr->startdev = startdev;
2955         cqr->memdev = startdev;
2956         cqr->block = block;
2957         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2958         cqr->lpm = startdev->path_data.ppm;
2959         cqr->retries = 256;
2960         cqr->buildclk = get_clock();
2961         cqr->status = DASD_CQR_FILLED;
2962         return cqr;
2963 }
2964
2965 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
2966                                                struct dasd_block *block,
2967                                                struct request *req)
2968 {
2969         int cmdrtd, cmdwtd;
2970         int use_prefix;
2971         int fcx_multitrack;
2972         struct dasd_eckd_private *private;
2973         struct dasd_device *basedev;
2974         sector_t first_rec, last_rec;
2975         sector_t first_trk, last_trk;
2976         unsigned int first_offs, last_offs;
2977         unsigned int blk_per_trk, blksize;
2978         int cdlspecial;
2979         unsigned int data_size;
2980         struct dasd_ccw_req *cqr;
2981
2982         basedev = block->base;
2983         private = (struct dasd_eckd_private *) basedev->private;
2984
2985         /* Calculate number of blocks/records per track. */
2986         blksize = block->bp_block;
2987         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
2988         if (blk_per_trk == 0)
2989                 return ERR_PTR(-EINVAL);
2990         /* Calculate record id of first and last block. */
2991         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
2992         first_offs = sector_div(first_trk, blk_per_trk);
2993         last_rec = last_trk =
2994                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
2995         last_offs = sector_div(last_trk, blk_per_trk);
2996         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
2997
2998         fcx_multitrack = private->features.feature[40] & 0x20;
2999         data_size = blk_rq_bytes(req);
3000         /* tpm write request add CBC data on each track boundary */
3001         if (rq_data_dir(req) == WRITE)
3002                 data_size += (last_trk - first_trk) * 4;
3003
3004         /* is read track data and write track data in command mode supported? */
3005         cmdrtd = private->features.feature[9] & 0x20;
3006         cmdwtd = private->features.feature[12] & 0x40;
3007         use_prefix = private->features.feature[8] & 0x01;
3008
3009         cqr = NULL;
3010         if (cdlspecial || dasd_page_cache) {
3011                 /* do nothing, just fall through to the cmd mode single case */
3012         } else if ((data_size <= private->fcx_max_data)
3013                    && (fcx_multitrack || (first_trk == last_trk))) {
3014                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3015                                                     first_rec, last_rec,
3016                                                     first_trk, last_trk,
3017                                                     first_offs, last_offs,
3018                                                     blk_per_trk, blksize);
3019                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3020                     (PTR_ERR(cqr) != -ENOMEM))
3021                         cqr = NULL;
3022         } else if (use_prefix &&
3023                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3024                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3025                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3026                                                    first_rec, last_rec,
3027                                                    first_trk, last_trk,
3028                                                    first_offs, last_offs,
3029                                                    blk_per_trk, blksize);
3030                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3031                     (PTR_ERR(cqr) != -ENOMEM))
3032                         cqr = NULL;
3033         }
3034         if (!cqr)
3035                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3036                                                     first_rec, last_rec,
3037                                                     first_trk, last_trk,
3038                                                     first_offs, last_offs,
3039                                                     blk_per_trk, blksize);
3040         return cqr;
3041 }
3042
3043 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3044                                                struct dasd_block *block,
3045                                                struct request *req)
3046 {
3047         unsigned long *idaws;
3048         struct dasd_device *basedev;
3049         struct dasd_ccw_req *cqr;
3050         struct ccw1 *ccw;
3051         struct req_iterator iter;
3052         struct bio_vec *bv;
3053         char *dst;
3054         unsigned char cmd;
3055         unsigned int trkcount;
3056         unsigned int seg_len, len_to_track_end;
3057         unsigned int first_offs;
3058         unsigned int cidaw, cplength, datasize;
3059         sector_t first_trk, last_trk;
3060         unsigned int pfx_datasize;
3061
3062         /*
3063          * raw track access needs to be mutiple of 64k and on 64k boundary
3064          */
3065         if ((blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK) != 0) {
3066                 cqr = ERR_PTR(-EINVAL);
3067                 goto out;
3068         }
3069         if (((blk_rq_pos(req) + blk_rq_sectors(req)) %
3070              DASD_RAW_SECTORS_PER_TRACK) != 0) {
3071                 cqr = ERR_PTR(-EINVAL);
3072                 goto out;
3073         }
3074
3075         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3076         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3077                 DASD_RAW_SECTORS_PER_TRACK;
3078         trkcount = last_trk - first_trk + 1;
3079         first_offs = 0;
3080         basedev = block->base;
3081
3082         if (rq_data_dir(req) == READ)
3083                 cmd = DASD_ECKD_CCW_READ_TRACK;
3084         else if (rq_data_dir(req) == WRITE)
3085                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3086         else {
3087                 cqr = ERR_PTR(-EINVAL);
3088                 goto out;
3089         }
3090
3091         /*
3092          * Raw track based I/O needs IDAWs for each page,
3093          * and not just for 64 bit addresses.
3094          */
3095         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3096
3097         /* 1x prefix + one read/write ccw per track */
3098         cplength = 1 + trkcount;
3099
3100         /*
3101          * struct PFX_eckd_data has up to 2 byte as extended parameter
3102          * this is needed for write full track and has to be mentioned
3103          * separately
3104          * add 8 instead of 2 to keep 8 byte boundary
3105          */
3106         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3107
3108         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3109
3110         /* Allocate the ccw request. */
3111         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3112                                    datasize, startdev);
3113         if (IS_ERR(cqr))
3114                 goto out;
3115         ccw = cqr->cpaddr;
3116
3117         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3118                        basedev, startdev, 1 /* format */, first_offs + 1,
3119                        trkcount, 0, 0) == -EAGAIN) {
3120                 /* Clock not in sync and XRC is enabled.
3121                  * Try again later.
3122                  */
3123                 dasd_sfree_request(cqr, startdev);
3124                 cqr = ERR_PTR(-EAGAIN);
3125                 goto out;
3126         }
3127
3128         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3129
3130         len_to_track_end = 0;
3131
3132         rq_for_each_segment(bv, req, iter) {
3133                 dst = page_address(bv->bv_page) + bv->bv_offset;
3134                 seg_len = bv->bv_len;
3135                 if (!len_to_track_end) {
3136                         ccw[-1].flags |= CCW_FLAG_CC;
3137                         ccw->cmd_code = cmd;
3138                         /* maximum 3390 track size */
3139                         ccw->count = 57326;
3140                         /* 64k map to one track */
3141                         len_to_track_end = 65536;
3142                         ccw->cda = (__u32)(addr_t)idaws;
3143                         ccw->flags |= CCW_FLAG_IDA;
3144                         ccw->flags |= CCW_FLAG_SLI;
3145                         ccw++;
3146                 }
3147                 len_to_track_end -= seg_len;
3148                 idaws = idal_create_words(idaws, dst, seg_len);
3149         }
3150
3151         if (blk_noretry_request(req) ||
3152             block->base->features & DASD_FEATURE_FAILFAST)
3153                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3154         cqr->startdev = startdev;
3155         cqr->memdev = startdev;
3156         cqr->block = block;
3157         cqr->expires = startdev->default_expires * HZ;
3158         cqr->lpm = startdev->path_data.ppm;
3159         cqr->retries = 256;
3160         cqr->buildclk = get_clock();
3161         cqr->status = DASD_CQR_FILLED;
3162
3163         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3164                 cqr = NULL;
3165 out:
3166         return cqr;
3167 }
3168
3169
3170 static int
3171 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3172 {
3173         struct dasd_eckd_private *private;
3174         struct ccw1 *ccw;
3175         struct req_iterator iter;
3176         struct bio_vec *bv;
3177         char *dst, *cda;
3178         unsigned int blksize, blk_per_trk, off;
3179         sector_t recid;
3180         int status;
3181
3182         if (!dasd_page_cache)
3183                 goto out;
3184         private = (struct dasd_eckd_private *) cqr->block->base->private;
3185         blksize = cqr->block->bp_block;
3186         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3187         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3188         ccw = cqr->cpaddr;
3189         /* Skip over define extent & locate record. */
3190         ccw++;
3191         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3192                 ccw++;
3193         rq_for_each_segment(bv, req, iter) {
3194                 dst = page_address(bv->bv_page) + bv->bv_offset;
3195                 for (off = 0; off < bv->bv_len; off += blksize) {
3196                         /* Skip locate record. */
3197                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3198                                 ccw++;
3199                         if (dst) {
3200                                 if (ccw->flags & CCW_FLAG_IDA)
3201                                         cda = *((char **)((addr_t) ccw->cda));
3202                                 else
3203                                         cda = (char *)((addr_t) ccw->cda);
3204                                 if (dst != cda) {
3205                                         if (rq_data_dir(req) == READ)
3206                                                 memcpy(dst, cda, bv->bv_len);
3207                                         kmem_cache_free(dasd_page_cache,
3208                                             (void *)((addr_t)cda & PAGE_MASK));
3209                                 }
3210                                 dst = NULL;
3211                         }
3212                         ccw++;
3213                         recid++;
3214                 }
3215         }
3216 out:
3217         status = cqr->status == DASD_CQR_DONE;
3218         dasd_sfree_request(cqr, cqr->memdev);
3219         return status;
3220 }
3221
3222 /*
3223  * Modify ccw/tcw in cqr so it can be started on a base device.
3224  *
3225  * Note that this is not enough to restart the cqr!
3226  * Either reset cqr->startdev as well (summary unit check handling)
3227  * or restart via separate cqr (as in ERP handling).
3228  */
3229 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3230 {
3231         struct ccw1 *ccw;
3232         struct PFX_eckd_data *pfxdata;
3233         struct tcw *tcw;
3234         struct tccb *tccb;
3235         struct dcw *dcw;
3236
3237         if (cqr->cpmode == 1) {
3238                 tcw = cqr->cpaddr;
3239                 tccb = tcw_get_tccb(tcw);
3240                 dcw = (struct dcw *)&tccb->tca[0];
3241                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3242                 pfxdata->validity.verify_base = 0;
3243                 pfxdata->validity.hyper_pav = 0;
3244         } else {
3245                 ccw = cqr->cpaddr;
3246                 pfxdata = cqr->data;
3247                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3248                         pfxdata->validity.verify_base = 0;
3249                         pfxdata->validity.hyper_pav = 0;
3250                 }
3251         }
3252 }
3253
3254 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3255
3256 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3257                                                      struct dasd_block *block,
3258                                                      struct request *req)
3259 {
3260         struct dasd_eckd_private *private;
3261         struct dasd_device *startdev;
3262         unsigned long flags;
3263         struct dasd_ccw_req *cqr;
3264
3265         startdev = dasd_alias_get_start_dev(base);
3266         if (!startdev)
3267                 startdev = base;
3268         private = (struct dasd_eckd_private *) startdev->private;
3269         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3270                 return ERR_PTR(-EBUSY);
3271
3272         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3273         private->count++;
3274         if ((base->features & DASD_FEATURE_USERAW))
3275                 cqr = dasd_raw_build_cp(startdev, block, req);
3276         else
3277                 cqr = dasd_eckd_build_cp(startdev, block, req);
3278         if (IS_ERR(cqr))
3279                 private->count--;
3280         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3281         return cqr;
3282 }
3283
3284 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3285                                    struct request *req)
3286 {
3287         struct dasd_eckd_private *private;
3288         unsigned long flags;
3289
3290         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3291         private = (struct dasd_eckd_private *) cqr->memdev->private;
3292         private->count--;
3293         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3294         return dasd_eckd_free_cp(cqr, req);
3295 }
3296
3297 static int
3298 dasd_eckd_fill_info(struct dasd_device * device,
3299                     struct dasd_information2_t * info)
3300 {
3301         struct dasd_eckd_private *private;
3302
3303         private = (struct dasd_eckd_private *) device->private;
3304         info->label_block = 2;
3305         info->FBA_layout = private->uses_cdl ? 0 : 1;
3306         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3307         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3308         memcpy(info->characteristics, &private->rdc_data,
3309                sizeof(struct dasd_eckd_characteristics));
3310         info->confdata_size = min((unsigned long)private->conf_len,
3311                                   sizeof(info->configuration_data));
3312         memcpy(info->configuration_data, private->conf_data,
3313                info->confdata_size);
3314         return 0;
3315 }
3316
3317 /*
3318  * SECTION: ioctl functions for eckd devices.
3319  */
3320
3321 /*
3322  * Release device ioctl.
3323  * Buils a channel programm to releases a prior reserved
3324  * (see dasd_eckd_reserve) device.
3325  */
3326 static int
3327 dasd_eckd_release(struct dasd_device *device)
3328 {
3329         struct dasd_ccw_req *cqr;
3330         int rc;
3331         struct ccw1 *ccw;
3332         int useglobal;
3333
3334         if (!capable(CAP_SYS_ADMIN))
3335                 return -EACCES;
3336
3337         useglobal = 0;
3338         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3339         if (IS_ERR(cqr)) {
3340                 mutex_lock(&dasd_reserve_mutex);
3341                 useglobal = 1;
3342                 cqr = &dasd_reserve_req->cqr;
3343                 memset(cqr, 0, sizeof(*cqr));
3344                 memset(&dasd_reserve_req->ccw, 0,
3345                        sizeof(dasd_reserve_req->ccw));
3346                 cqr->cpaddr = &dasd_reserve_req->ccw;
3347                 cqr->data = &dasd_reserve_req->data;
3348                 cqr->magic = DASD_ECKD_MAGIC;
3349         }
3350         ccw = cqr->cpaddr;
3351         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3352         ccw->flags |= CCW_FLAG_SLI;
3353         ccw->count = 32;
3354         ccw->cda = (__u32)(addr_t) cqr->data;
3355         cqr->startdev = device;
3356         cqr->memdev = device;
3357         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3358         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3359         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3360         cqr->expires = 2 * HZ;
3361         cqr->buildclk = get_clock();
3362         cqr->status = DASD_CQR_FILLED;
3363
3364         rc = dasd_sleep_on_immediatly(cqr);
3365         if (!rc)
3366                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3367
3368         if (useglobal)
3369                 mutex_unlock(&dasd_reserve_mutex);
3370         else
3371                 dasd_sfree_request(cqr, cqr->memdev);
3372         return rc;
3373 }
3374
3375 /*
3376  * Reserve device ioctl.
3377  * Options are set to 'synchronous wait for interrupt' and
3378  * 'timeout the request'. This leads to a terminate IO if
3379  * the interrupt is outstanding for a certain time.
3380  */
3381 static int
3382 dasd_eckd_reserve(struct dasd_device *device)
3383 {
3384         struct dasd_ccw_req *cqr;
3385         int rc;
3386         struct ccw1 *ccw;
3387         int useglobal;
3388
3389         if (!capable(CAP_SYS_ADMIN))
3390                 return -EACCES;
3391
3392         useglobal = 0;
3393         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3394         if (IS_ERR(cqr)) {
3395                 mutex_lock(&dasd_reserve_mutex);
3396                 useglobal = 1;
3397                 cqr = &dasd_reserve_req->cqr;
3398                 memset(cqr, 0, sizeof(*cqr));
3399                 memset(&dasd_reserve_req->ccw, 0,
3400                        sizeof(dasd_reserve_req->ccw));
3401                 cqr->cpaddr = &dasd_reserve_req->ccw;
3402                 cqr->data = &dasd_reserve_req->data;
3403                 cqr->magic = DASD_ECKD_MAGIC;
3404         }
3405         ccw = cqr->cpaddr;
3406         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3407         ccw->flags |= CCW_FLAG_SLI;
3408         ccw->count = 32;
3409         ccw->cda = (__u32)(addr_t) cqr->data;
3410         cqr->startdev = device;
3411         cqr->memdev = device;
3412         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3413         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3414         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3415         cqr->expires = 2 * HZ;
3416         cqr->buildclk = get_clock();
3417         cqr->status = DASD_CQR_FILLED;
3418
3419         rc = dasd_sleep_on_immediatly(cqr);
3420         if (!rc)
3421                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3422
3423         if (useglobal)
3424                 mutex_unlock(&dasd_reserve_mutex);
3425         else
3426                 dasd_sfree_request(cqr, cqr->memdev);
3427         return rc;
3428 }
3429
3430 /*
3431  * Steal lock ioctl - unconditional reserve device.
3432  * Buils a channel programm to break a device's reservation.
3433  * (unconditional reserve)
3434  */
3435 static int
3436 dasd_eckd_steal_lock(struct dasd_device *device)
3437 {
3438         struct dasd_ccw_req *cqr;
3439         int rc;
3440         struct ccw1 *ccw;
3441         int useglobal;
3442
3443         if (!capable(CAP_SYS_ADMIN))
3444                 return -EACCES;
3445
3446         useglobal = 0;
3447         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3448         if (IS_ERR(cqr)) {
3449                 mutex_lock(&dasd_reserve_mutex);
3450                 useglobal = 1;
3451                 cqr = &dasd_reserve_req->cqr;
3452                 memset(cqr, 0, sizeof(*cqr));
3453                 memset(&dasd_reserve_req->ccw, 0,
3454                        sizeof(dasd_reserve_req->ccw));
3455                 cqr->cpaddr = &dasd_reserve_req->ccw;
3456                 cqr->data = &dasd_reserve_req->data;
3457                 cqr->magic = DASD_ECKD_MAGIC;
3458         }
3459         ccw = cqr->cpaddr;
3460         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3461         ccw->flags |= CCW_FLAG_SLI;
3462         ccw->count = 32;
3463         ccw->cda = (__u32)(addr_t) cqr->data;
3464         cqr->startdev = device;
3465         cqr->memdev = device;
3466         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3467         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3468         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3469         cqr->expires = 2 * HZ;
3470         cqr->buildclk = get_clock();
3471         cqr->status = DASD_CQR_FILLED;
3472
3473         rc = dasd_sleep_on_immediatly(cqr);
3474         if (!rc)
3475                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3476
3477         if (useglobal)
3478                 mutex_unlock(&dasd_reserve_mutex);
3479         else
3480                 dasd_sfree_request(cqr, cqr->memdev);
3481         return rc;
3482 }
3483
3484 /*
3485  * SNID - Sense Path Group ID
3486  * This ioctl may be used in situations where I/O is stalled due to
3487  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3488  * preallocated dasd_reserve_req.
3489  */
3490 static int dasd_eckd_snid(struct dasd_device *device,
3491                           void __user *argp)
3492 {
3493         struct dasd_ccw_req *cqr;
3494         int rc;
3495         struct ccw1 *ccw;
3496         int useglobal;
3497         struct dasd_snid_ioctl_data usrparm;
3498
3499         if (!capable(CAP_SYS_ADMIN))
3500                 return -EACCES;
3501
3502         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3503                 return -EFAULT;
3504
3505         useglobal = 0;
3506         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3507                                    sizeof(struct dasd_snid_data), device);
3508         if (IS_ERR(cqr)) {
3509                 mutex_lock(&dasd_reserve_mutex);
3510                 useglobal = 1;
3511                 cqr = &dasd_reserve_req->cqr;
3512                 memset(cqr, 0, sizeof(*cqr));
3513                 memset(&dasd_reserve_req->ccw, 0,
3514                        sizeof(dasd_reserve_req->ccw));
3515                 cqr->cpaddr = &dasd_reserve_req->ccw;
3516                 cqr->data = &dasd_reserve_req->data;
3517                 cqr->magic = DASD_ECKD_MAGIC;
3518         }
3519         ccw = cqr->cpaddr;
3520         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3521         ccw->flags |= CCW_FLAG_SLI;
3522         ccw->count = 12;
3523         ccw->cda = (__u32)(addr_t) cqr->data;
3524         cqr->startdev = device;
3525         cqr->memdev = device;
3526         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3527         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3528         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3529         cqr->retries = 5;
3530         cqr->expires = 10 * HZ;
3531         cqr->buildclk = get_clock();
3532         cqr->status = DASD_CQR_FILLED;
3533         cqr->lpm = usrparm.path_mask;
3534
3535         rc = dasd_sleep_on_immediatly(cqr);
3536         /* verify that I/O processing didn't modify the path mask */
3537         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3538                 rc = -EIO;
3539         if (!rc) {
3540                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3541                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3542                         rc = -EFAULT;
3543         }
3544
3545         if (useglobal)
3546                 mutex_unlock(&dasd_reserve_mutex);
3547         else
3548                 dasd_sfree_request(cqr, cqr->memdev);
3549         return rc;
3550 }
3551
3552 /*
3553  * Read performance statistics
3554  */
3555 static int
3556 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3557 {
3558         struct dasd_psf_prssd_data *prssdp;
3559         struct dasd_rssd_perf_stats_t *stats;
3560         struct dasd_ccw_req *cqr;
3561         struct ccw1 *ccw;
3562         int rc;
3563
3564         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3565                                    (sizeof(struct dasd_psf_prssd_data) +
3566                                     sizeof(struct dasd_rssd_perf_stats_t)),
3567                                    device);
3568         if (IS_ERR(cqr)) {
3569                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3570                             "Could not allocate initialization request");
3571                 return PTR_ERR(cqr);
3572         }
3573         cqr->startdev = device;
3574         cqr->memdev = device;
3575         cqr->retries = 0;
3576         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3577         cqr->expires = 10 * HZ;
3578
3579         /* Prepare for Read Subsystem Data */
3580         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3581         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3582         prssdp->order = PSF_ORDER_PRSSD;
3583         prssdp->suborder = 0x01;        /* Performance Statistics */
3584         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3585
3586         ccw = cqr->cpaddr;
3587         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3588         ccw->count = sizeof(struct dasd_psf_prssd_data);
3589         ccw->flags |= CCW_FLAG_CC;
3590         ccw->cda = (__u32)(addr_t) prssdp;
3591
3592         /* Read Subsystem Data - Performance Statistics */
3593         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3594         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3595
3596         ccw++;
3597         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3598         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3599         ccw->cda = (__u32)(addr_t) stats;
3600
3601         cqr->buildclk = get_clock();
3602         cqr->status = DASD_CQR_FILLED;
3603         rc = dasd_sleep_on(cqr);
3604         if (rc == 0) {
3605                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3606                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3607                 if (copy_to_user(argp, stats,
3608                                  sizeof(struct dasd_rssd_perf_stats_t)))
3609                         rc = -EFAULT;
3610         }
3611         dasd_sfree_request(cqr, cqr->memdev);
3612         return rc;
3613 }
3614
3615 /*
3616  * Get attributes (cache operations)
3617  * Returnes the cache attributes used in Define Extend (DE).
3618  */
3619 static int
3620 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3621 {
3622         struct dasd_eckd_private *private =
3623                 (struct dasd_eckd_private *)device->private;
3624         struct attrib_data_t attrib = private->attrib;
3625         int rc;
3626
3627         if (!capable(CAP_SYS_ADMIN))
3628                 return -EACCES;
3629         if (!argp)
3630                 return -EINVAL;
3631
3632         rc = 0;
3633         if (copy_to_user(argp, (long *) &attrib,
3634                          sizeof(struct attrib_data_t)))
3635                 rc = -EFAULT;
3636
3637         return rc;
3638 }
3639
3640 /*
3641  * Set attributes (cache operations)
3642  * Stores the attributes for cache operation to be used in Define Extend (DE).
3643  */
3644 static int
3645 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3646 {
3647         struct dasd_eckd_private *private =
3648                 (struct dasd_eckd_private *)device->private;
3649         struct attrib_data_t attrib;
3650
3651         if (!capable(CAP_SYS_ADMIN))
3652                 return -EACCES;
3653         if (!argp)
3654                 return -EINVAL;
3655
3656         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3657                 return -EFAULT;
3658         private->attrib = attrib;
3659
3660         dev_info(&device->cdev->dev,
3661                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3662                  private->attrib.operation, private->attrib.nr_cyl);
3663         return 0;
3664 }
3665
3666 /*
3667  * Issue syscall I/O to EMC Symmetrix array.
3668  * CCWs are PSF and RSSD
3669  */
3670 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3671 {
3672         struct dasd_symmio_parms usrparm;
3673         char *psf_data, *rssd_result;
3674         struct dasd_ccw_req *cqr;
3675         struct ccw1 *ccw;
3676         char psf0, psf1;
3677         int rc;
3678
3679         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3680                 return -EACCES;
3681         psf0 = psf1 = 0;
3682
3683         /* Copy parms from caller */
3684         rc = -EFAULT;
3685         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3686                 goto out;
3687         if (is_compat_task() || sizeof(long) == 4) {
3688                 /* Make sure pointers are sane even on 31 bit. */
3689                 rc = -EINVAL;
3690                 if ((usrparm.psf_data >> 32) != 0)
3691                         goto out;
3692                 if ((usrparm.rssd_result >> 32) != 0)
3693                         goto out;
3694                 usrparm.psf_data &= 0x7fffffffULL;
3695                 usrparm.rssd_result &= 0x7fffffffULL;
3696         }
3697         /* alloc I/O data area */
3698         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
3699         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
3700         if (!psf_data || !rssd_result) {
3701                 rc = -ENOMEM;
3702                 goto out_free;
3703         }
3704
3705         /* get syscall header from user space */
3706         rc = -EFAULT;
3707         if (copy_from_user(psf_data,
3708                            (void __user *)(unsigned long) usrparm.psf_data,
3709                            usrparm.psf_data_len))
3710                 goto out_free;
3711         psf0 = psf_data[0];
3712         psf1 = psf_data[1];
3713
3714         /* setup CCWs for PSF + RSSD */
3715         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
3716         if (IS_ERR(cqr)) {
3717                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3718                         "Could not allocate initialization request");
3719                 rc = PTR_ERR(cqr);
3720                 goto out_free;
3721         }
3722
3723         cqr->startdev = device;
3724         cqr->memdev = device;
3725         cqr->retries = 3;
3726         cqr->expires = 10 * HZ;
3727         cqr->buildclk = get_clock();
3728         cqr->status = DASD_CQR_FILLED;
3729
3730         /* Build the ccws */
3731         ccw = cqr->cpaddr;
3732
3733         /* PSF ccw */
3734         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3735         ccw->count = usrparm.psf_data_len;
3736         ccw->flags |= CCW_FLAG_CC;
3737         ccw->cda = (__u32)(addr_t) psf_data;
3738
3739         ccw++;
3740
3741         /* RSSD ccw  */
3742         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3743         ccw->count = usrparm.rssd_result_len;
3744         ccw->flags = CCW_FLAG_SLI ;
3745         ccw->cda = (__u32)(addr_t) rssd_result;
3746
3747         rc = dasd_sleep_on(cqr);
3748         if (rc)
3749                 goto out_sfree;
3750
3751         rc = -EFAULT;
3752         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
3753                            rssd_result, usrparm.rssd_result_len))
3754                 goto out_sfree;
3755         rc = 0;
3756
3757 out_sfree:
3758         dasd_sfree_request(cqr, cqr->memdev);
3759 out_free:
3760         kfree(rssd_result);
3761         kfree(psf_data);
3762 out:
3763         DBF_DEV_EVENT(DBF_WARNING, device,
3764                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
3765                       (int) psf0, (int) psf1, rc);
3766         return rc;
3767 }
3768
3769 static int
3770 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
3771 {
3772         struct dasd_device *device = block->base;
3773
3774         switch (cmd) {
3775         case BIODASDGATTR:
3776                 return dasd_eckd_get_attrib(device, argp);
3777         case BIODASDSATTR:
3778                 return dasd_eckd_set_attrib(device, argp);
3779         case BIODASDPSRD:
3780                 return dasd_eckd_performance(device, argp);
3781         case BIODASDRLSE:
3782                 return dasd_eckd_release(device);
3783         case BIODASDRSRV:
3784                 return dasd_eckd_reserve(device);
3785         case BIODASDSLCK:
3786                 return dasd_eckd_steal_lock(device);
3787         case BIODASDSNID:
3788                 return dasd_eckd_snid(device, argp);
3789         case BIODASDSYMMIO:
3790                 return dasd_symm_io(device, argp);
3791         default:
3792                 return -ENOIOCTLCMD;
3793         }
3794 }
3795
3796 /*
3797  * Dump the range of CCWs into 'page' buffer
3798  * and return number of printed chars.
3799  */
3800 static int
3801 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
3802 {
3803         int len, count;
3804         char *datap;
3805
3806         len = 0;
3807         while (from <= to) {
3808                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3809                                " CCW %p: %08X %08X DAT:",
3810                                from, ((int *) from)[0], ((int *) from)[1]);
3811
3812                 /* get pointer to data (consider IDALs) */
3813                 if (from->flags & CCW_FLAG_IDA)
3814                         datap = (char *) *((addr_t *) (addr_t) from->cda);
3815                 else
3816                         datap = (char *) ((addr_t) from->cda);
3817
3818                 /* dump data (max 32 bytes) */
3819                 for (count = 0; count < from->count && count < 32; count++) {
3820                         if (count % 8 == 0) len += sprintf(page + len, " ");
3821                         if (count % 4 == 0) len += sprintf(page + len, " ");
3822                         len += sprintf(page + len, "%02x", datap[count]);
3823                 }
3824                 len += sprintf(page + len, "\n");
3825                 from++;
3826         }
3827         return len;
3828 }
3829
3830 static void
3831 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
3832                          char *reason)
3833 {
3834         u64 *sense;
3835         u64 *stat;
3836
3837         sense = (u64 *) dasd_get_sense(irb);
3838         stat = (u64 *) &irb->scsw;
3839         if (sense) {
3840                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
3841                               "%016llx %016llx %016llx %016llx",
3842                               reason, *stat, *((u32 *) (stat + 1)),
3843                               sense[0], sense[1], sense[2], sense[3]);
3844         } else {
3845                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
3846                               reason, *stat, *((u32 *) (stat + 1)),
3847                               "NO VALID SENSE");
3848         }
3849 }
3850
3851 /*
3852  * Print sense data and related channel program.
3853  * Parts are printed because printk buffer is only 1024 bytes.
3854  */
3855 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
3856                                  struct dasd_ccw_req *req, struct irb *irb)
3857 {
3858         char *page;
3859         struct ccw1 *first, *last, *fail, *from, *to;
3860         int len, sl, sct;
3861
3862         page = (char *) get_zeroed_page(GFP_ATOMIC);
3863         if (page == NULL) {
3864                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3865                               "No memory to dump sense data\n");
3866                 return;
3867         }
3868         /* dump the sense data */
3869         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3870                       " I/O status report for device %s:\n",
3871                       dev_name(&device->cdev->dev));
3872         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3873                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3874                        "CS:%02X RC:%d\n",
3875                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3876                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3877                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3878                        req ? req->intrc : 0);
3879         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3880                        " device %s: Failing CCW: %p\n",
3881                        dev_name(&device->cdev->dev),
3882                        (void *) (addr_t) irb->scsw.cmd.cpa);
3883         if (irb->esw.esw0.erw.cons) {
3884                 for (sl = 0; sl < 4; sl++) {
3885                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3886                                        " Sense(hex) %2d-%2d:",
3887                                        (8 * sl), ((8 * sl) + 7));
3888
3889                         for (sct = 0; sct < 8; sct++) {
3890                                 len += sprintf(page + len, " %02x",
3891                                                irb->ecw[8 * sl + sct]);
3892                         }
3893                         len += sprintf(page + len, "\n");
3894                 }
3895
3896                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
3897                         /* 24 Byte Sense Data */
3898                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3899                                 " 24 Byte: %x MSG %x, "
3900                                 "%s MSGb to SYSOP\n",
3901                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
3902                                 irb->ecw[1] & 0x10 ? "" : "no");
3903                 } else {
3904                         /* 32 Byte Sense Data */
3905                         sprintf(page + len, KERN_ERR PRINTK_HEADER
3906                                 " 32 Byte: Format: %x "
3907                                 "Exception class %x\n",
3908                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
3909                 }
3910         } else {
3911                 sprintf(page + len, KERN_ERR PRINTK_HEADER
3912                         " SORRY - NO VALID SENSE AVAILABLE\n");
3913         }
3914         printk("%s", page);
3915
3916         if (req) {
3917                 /* req == NULL for unsolicited interrupts */
3918                 /* dump the Channel Program (max 140 Bytes per line) */
3919                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
3920                 first = req->cpaddr;
3921                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
3922                 to = min(first + 6, last);
3923                 len = sprintf(page,  KERN_ERR PRINTK_HEADER
3924                               " Related CP in req: %p\n", req);
3925                 dasd_eckd_dump_ccw_range(first, to, page + len);
3926                 printk("%s", page);
3927
3928                 /* print failing CCW area (maximum 4) */
3929                 /* scsw->cda is either valid or zero  */
3930                 len = 0;
3931                 from = ++to;
3932                 fail = (struct ccw1 *)(addr_t)
3933                                 irb->scsw.cmd.cpa; /* failing CCW */
3934                 if (from <  fail - 2) {
3935                         from = fail - 2;     /* there is a gap - print header */
3936                         len += sprintf(page, KERN_ERR PRINTK_HEADER "......\n");
3937                 }
3938                 to = min(fail + 1, last);
3939                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
3940
3941                 /* print last CCWs (maximum 2) */
3942                 from = max(from, ++to);
3943                 if (from < last - 1) {
3944                         from = last - 1;     /* there is a gap - print header */
3945                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
3946                 }
3947                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
3948                 if (len > 0)
3949                         printk("%s", page);
3950         }
3951         free_page((unsigned long) page);
3952 }
3953
3954
3955 /*
3956  * Print sense data from a tcw.
3957  */
3958 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
3959                                  struct dasd_ccw_req *req, struct irb *irb)
3960 {
3961         char *page;
3962         int len, sl, sct, residual;
3963         struct tsb *tsb;
3964         u8 *sense, *rcq;
3965
3966         page = (char *) get_zeroed_page(GFP_ATOMIC);
3967         if (page == NULL) {
3968                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
3969                             "No memory to dump sense data");
3970                 return;
3971         }
3972         /* dump the sense data */
3973         len = sprintf(page,  KERN_ERR PRINTK_HEADER
3974                       " I/O status report for device %s:\n",
3975                       dev_name(&device->cdev->dev));
3976         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3977                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
3978                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
3979                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
3980                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
3981                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
3982                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
3983                        req ? req->intrc : 0);
3984         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3985                        " device %s: Failing TCW: %p\n",
3986                        dev_name(&device->cdev->dev),
3987                        (void *) (addr_t) irb->scsw.tm.tcw);
3988
3989         tsb = NULL;
3990         sense = NULL;
3991         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
3992                 tsb = tcw_get_tsb(
3993                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
3994
3995         if (tsb) {
3996                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3997                                " tsb->length %d\n", tsb->length);
3998                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
3999                                " tsb->flags %x\n", tsb->flags);
4000                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4001                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4002                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4003                                " tsb->count %d\n", tsb->count);
4004                 residual = tsb->count - 28;
4005                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4006                                " residual %d\n", residual);
4007
4008                 switch (tsb->flags & 0x07) {
4009                 case 1: /* tsa_iostat */
4010                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4011                                " tsb->tsa.iostat.dev_time %d\n",
4012                                        tsb->tsa.iostat.dev_time);
4013                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4014                                " tsb->tsa.iostat.def_time %d\n",
4015                                        tsb->tsa.iostat.def_time);
4016                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4017                                " tsb->tsa.iostat.queue_time %d\n",
4018                                        tsb->tsa.iostat.queue_time);
4019                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4020                                " tsb->tsa.iostat.dev_busy_time %d\n",
4021                                        tsb->tsa.iostat.dev_busy_time);
4022                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4023                                " tsb->tsa.iostat.dev_act_time %d\n",
4024                                        tsb->tsa.iostat.dev_act_time);
4025                         sense = tsb->tsa.iostat.sense;
4026                         break;
4027                 case 2: /* ts_ddpc */
4028                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4029                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4030                         for (sl = 0; sl < 2; sl++) {
4031                                 len += sprintf(page + len,
4032                                                KERN_ERR PRINTK_HEADER
4033                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4034                                                (8 * sl), ((8 * sl) + 7));
4035                                 rcq = tsb->tsa.ddpc.rcq;
4036                                 for (sct = 0; sct < 8; sct++) {
4037                                         len += sprintf(page + len, " %02x",
4038                                                        rcq[8 * sl + sct]);
4039                                 }
4040                                 len += sprintf(page + len, "\n");
4041                         }
4042                         sense = tsb->tsa.ddpc.sense;
4043                         break;
4044                 case 3: /* tsa_intrg */
4045                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
4046                                       " tsb->tsa.intrg.: not supportet yet \n");
4047                         break;
4048                 }
4049
4050                 if (sense) {
4051                         for (sl = 0; sl < 4; sl++) {
4052                                 len += sprintf(page + len,
4053                                                KERN_ERR PRINTK_HEADER
4054                                                " Sense(hex) %2d-%2d:",
4055                                                (8 * sl), ((8 * sl) + 7));
4056                                 for (sct = 0; sct < 8; sct++) {
4057                                         len += sprintf(page + len, " %02x",
4058                                                        sense[8 * sl + sct]);
4059                                 }
4060                                 len += sprintf(page + len, "\n");
4061                         }
4062
4063                         if (sense[27] & DASD_SENSE_BIT_0) {
4064                                 /* 24 Byte Sense Data */
4065                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4066                                         " 24 Byte: %x MSG %x, "
4067                                         "%s MSGb to SYSOP\n",
4068                                         sense[7] >> 4, sense[7] & 0x0f,
4069                                         sense[1] & 0x10 ? "" : "no");
4070                         } else {
4071                                 /* 32 Byte Sense Data */
4072                                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4073                                         " 32 Byte: Format: %x "
4074                                         "Exception class %x\n",
4075                                         sense[6] & 0x0f, sense[22] >> 4);
4076                         }
4077                 } else {
4078                         sprintf(page + len, KERN_ERR PRINTK_HEADER
4079                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4080                 }
4081         } else {
4082                 sprintf(page + len, KERN_ERR PRINTK_HEADER
4083                         " SORRY - NO TSB DATA AVAILABLE\n");
4084         }
4085         printk("%s", page);
4086         free_page((unsigned long) page);
4087 }
4088
4089 static void dasd_eckd_dump_sense(struct dasd_device *device,
4090                                  struct dasd_ccw_req *req, struct irb *irb)
4091 {
4092         if (scsw_is_tm(&irb->scsw))
4093                 dasd_eckd_dump_sense_tcw(device, req, irb);
4094         else
4095                 dasd_eckd_dump_sense_ccw(device, req, irb);
4096 }
4097
4098 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4099 {
4100         /*
4101          * the device should be disconnected from our LCU structure
4102          * on restore we will reconnect it and reread LCU specific
4103          * information like PAV support that might have changed
4104          */
4105         dasd_alias_remove_device(device);
4106         dasd_alias_disconnect_device_from_lcu(device);
4107
4108         return 0;
4109 }
4110
4111 static int dasd_eckd_restore_device(struct dasd_device *device)
4112 {
4113         struct dasd_eckd_private *private;
4114         struct dasd_eckd_characteristics temp_rdc_data;
4115         int rc;
4116         struct dasd_uid temp_uid;
4117         unsigned long flags;
4118
4119         private = (struct dasd_eckd_private *) device->private;
4120
4121         /* Read Configuration Data */
4122         rc = dasd_eckd_read_conf(device);
4123         if (rc)
4124                 goto out_err;
4125
4126         dasd_eckd_get_uid(device, &temp_uid);
4127         /* Generate device unique id */
4128         rc = dasd_eckd_generate_uid(device);
4129         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4130         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4131                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4132                         "changed\n");
4133         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4134         if (rc)
4135                 goto out_err;
4136
4137         /* register lcu with alias handling, enable PAV if this is a new lcu */
4138         rc = dasd_alias_make_device_known_to_lcu(device);
4139         if (rc)
4140                 return rc;
4141         dasd_eckd_validate_server(device);
4142
4143         /* RE-Read Configuration Data */
4144         rc = dasd_eckd_read_conf(device);
4145         if (rc)
4146                 goto out_err;
4147
4148         /* Read Feature Codes */
4149         dasd_eckd_read_features(device);
4150
4151         /* Read Device Characteristics */
4152         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4153                                          &temp_rdc_data, 64);
4154         if (rc) {
4155                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4156                                 "Read device characteristic failed, rc=%d", rc);
4157                 goto out_err;
4158         }
4159         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4160         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4161         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4162
4163         /* add device to alias management */
4164         dasd_alias_add_device(device);
4165
4166         return 0;
4167
4168 out_err:
4169         return -1;
4170 }
4171
4172 static int dasd_eckd_reload_device(struct dasd_device *device)
4173 {
4174         struct dasd_eckd_private *private;
4175         int rc, old_base;
4176         char print_uid[60];
4177         struct dasd_uid uid;
4178         unsigned long flags;
4179
4180         private = (struct dasd_eckd_private *) device->private;
4181
4182         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4183         old_base = private->uid.base_unit_addr;
4184         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4185
4186         /* Read Configuration Data */
4187         rc = dasd_eckd_read_conf(device);
4188         if (rc)
4189                 goto out_err;
4190
4191         rc = dasd_eckd_generate_uid(device);
4192         if (rc)
4193                 goto out_err;
4194         /*
4195          * update unit address configuration and
4196          * add device to alias management
4197          */
4198         dasd_alias_update_add_device(device);
4199
4200         dasd_eckd_get_uid(device, &uid);
4201
4202         if (old_base != uid.base_unit_addr) {
4203                 if (strlen(uid.vduit) > 0)
4204                         snprintf(print_uid, sizeof(print_uid),
4205                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4206                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4207                 else
4208                         snprintf(print_uid, sizeof(print_uid),
4209                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4210                                  uid.ssid, uid.base_unit_addr);
4211
4212                 dev_info(&device->cdev->dev,
4213                          "An Alias device was reassigned to a new base device "
4214                          "with UID: %s\n", print_uid);
4215         }
4216         return 0;
4217
4218 out_err:
4219         return -1;
4220 }
4221
4222 static struct ccw_driver dasd_eckd_driver = {
4223         .driver = {
4224                 .name   = "dasd-eckd",
4225                 .owner  = THIS_MODULE,
4226         },
4227         .ids         = dasd_eckd_ids,
4228         .probe       = dasd_eckd_probe,
4229         .remove      = dasd_generic_remove,
4230         .set_offline = dasd_generic_set_offline,
4231         .set_online  = dasd_eckd_set_online,
4232         .notify      = dasd_generic_notify,
4233         .path_event  = dasd_generic_path_event,
4234         .freeze      = dasd_generic_pm_freeze,
4235         .thaw        = dasd_generic_restore_device,
4236         .restore     = dasd_generic_restore_device,
4237         .uc_handler  = dasd_generic_uc_handler,
4238         .int_class   = IOINT_DAS,
4239 };
4240
4241 /*
4242  * max_blocks is dependent on the amount of storage that is available
4243  * in the static io buffer for each device. Currently each device has
4244  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
4245  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
4246  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
4247  * addition we have one define extent ccw + 16 bytes of data and one
4248  * locate record ccw + 16 bytes of data. That makes:
4249  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
4250  * We want to fit two into the available memory so that we can immediately
4251  * start the next request if one finishes off. That makes 249.5 blocks
4252  * for one request. Give a little safety and the result is 240.
4253  */
4254 static struct dasd_discipline dasd_eckd_discipline = {
4255         .owner = THIS_MODULE,
4256         .name = "ECKD",
4257         .ebcname = "ECKD",
4258         .max_blocks = 190,
4259         .check_device = dasd_eckd_check_characteristics,
4260         .uncheck_device = dasd_eckd_uncheck_device,
4261         .do_analysis = dasd_eckd_do_analysis,
4262         .verify_path = dasd_eckd_verify_path,
4263         .ready_to_online = dasd_eckd_ready_to_online,
4264         .online_to_ready = dasd_eckd_online_to_ready,
4265         .fill_geometry = dasd_eckd_fill_geometry,
4266         .start_IO = dasd_start_IO,
4267         .term_IO = dasd_term_IO,
4268         .handle_terminated_request = dasd_eckd_handle_terminated_request,
4269         .format_device = dasd_eckd_format_device,
4270         .erp_action = dasd_eckd_erp_action,
4271         .erp_postaction = dasd_eckd_erp_postaction,
4272         .check_for_device_change = dasd_eckd_check_for_device_change,
4273         .build_cp = dasd_eckd_build_alias_cp,
4274         .free_cp = dasd_eckd_free_alias_cp,
4275         .dump_sense = dasd_eckd_dump_sense,
4276         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
4277         .fill_info = dasd_eckd_fill_info,
4278         .ioctl = dasd_eckd_ioctl,
4279         .freeze = dasd_eckd_pm_freeze,
4280         .restore = dasd_eckd_restore_device,
4281         .reload = dasd_eckd_reload_device,
4282         .get_uid = dasd_eckd_get_uid,
4283         .kick_validate = dasd_eckd_kick_validate_server,
4284 };
4285
4286 static int __init
4287 dasd_eckd_init(void)
4288 {
4289         int ret;
4290
4291         ASCEBC(dasd_eckd_discipline.ebcname, 4);
4292         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
4293                                    GFP_KERNEL | GFP_DMA);
4294         if (!dasd_reserve_req)
4295                 return -ENOMEM;
4296         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
4297                                    GFP_KERNEL | GFP_DMA);
4298         if (!path_verification_worker) {
4299                 kfree(dasd_reserve_req);
4300                 return -ENOMEM;
4301         }
4302         ret = ccw_driver_register(&dasd_eckd_driver);
4303         if (!ret)
4304                 wait_for_device_probe();
4305         else {
4306                 kfree(path_verification_worker);
4307                 kfree(dasd_reserve_req);
4308         }
4309         return ret;
4310 }
4311
4312 static void __exit
4313 dasd_eckd_cleanup(void)
4314 {
4315         ccw_driver_unregister(&dasd_eckd_driver);
4316         kfree(path_verification_worker);
4317         kfree(dasd_reserve_req);
4318 }
4319
4320 module_init(dasd_eckd_init);
4321 module_exit(dasd_eckd_cleanup);