block: convert to pos and nr_sectors accessors
[linux-2.6.git] / drivers / s390 / block / dasd_fba.c
1 /*
2  * File...........: linux/drivers/s390/block/dasd_fba.c
3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
4  * Bugreports.to..: <Linux390@de.ibm.com>
5  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
6  *
7  */
8
9 #define KMSG_COMPONENT "dasd"
10
11 #include <linux/stddef.h>
12 #include <linux/kernel.h>
13 #include <asm/debug.h>
14
15 #include <linux/slab.h>
16 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
17 #include <linux/bio.h>
18 #include <linux/module.h>
19 #include <linux/init.h>
20
21 #include <asm/idals.h>
22 #include <asm/ebcdic.h>
23 #include <asm/io.h>
24 #include <asm/todclk.h>
25 #include <asm/ccwdev.h>
26
27 #include "dasd_int.h"
28 #include "dasd_fba.h"
29
30 #ifdef PRINTK_HEADER
31 #undef PRINTK_HEADER
32 #endif                          /* PRINTK_HEADER */
33 #define PRINTK_HEADER "dasd(fba):"
34
35 #define DASD_FBA_CCW_WRITE 0x41
36 #define DASD_FBA_CCW_READ 0x42
37 #define DASD_FBA_CCW_LOCATE 0x43
38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
39
40 MODULE_LICENSE("GPL");
41
42 static struct dasd_discipline dasd_fba_discipline;
43
44 struct dasd_fba_private {
45         struct dasd_fba_characteristics rdc_data;
46 };
47
48 static struct ccw_device_id dasd_fba_ids[] = {
49         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), .driver_info = 0x1},
50         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), .driver_info = 0x2},
51         { /* end of list */ },
52 };
53
54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
55
56 static struct ccw_driver dasd_fba_driver; /* see below */
57 static int
58 dasd_fba_probe(struct ccw_device *cdev)
59 {
60         return dasd_generic_probe(cdev, &dasd_fba_discipline);
61 }
62
63 static int
64 dasd_fba_set_online(struct ccw_device *cdev)
65 {
66         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
67 }
68
69 static struct ccw_driver dasd_fba_driver = {
70         .name        = "dasd-fba",
71         .owner       = THIS_MODULE,
72         .ids         = dasd_fba_ids,
73         .probe       = dasd_fba_probe,
74         .remove      = dasd_generic_remove,
75         .set_offline = dasd_generic_set_offline,
76         .set_online  = dasd_fba_set_online,
77         .notify      = dasd_generic_notify,
78 };
79
80 static void
81 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
82               int blksize, int beg, int nr)
83 {
84         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
85         ccw->flags = 0;
86         ccw->count = 16;
87         ccw->cda = (__u32) __pa(data);
88         memset(data, 0, sizeof (struct DE_fba_data));
89         if (rw == WRITE)
90                 (data->mask).perm = 0x0;
91         else if (rw == READ)
92                 (data->mask).perm = 0x1;
93         else
94                 data->mask.perm = 0x2;
95         data->blk_size = blksize;
96         data->ext_loc = beg;
97         data->ext_end = nr - 1;
98 }
99
100 static void
101 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
102               int block_nr, int block_ct)
103 {
104         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
105         ccw->flags = 0;
106         ccw->count = 8;
107         ccw->cda = (__u32) __pa(data);
108         memset(data, 0, sizeof (struct LO_fba_data));
109         if (rw == WRITE)
110                 data->operation.cmd = 0x5;
111         else if (rw == READ)
112                 data->operation.cmd = 0x6;
113         else
114                 data->operation.cmd = 0x8;
115         data->blk_nr = block_nr;
116         data->blk_ct = block_ct;
117 }
118
119 static int
120 dasd_fba_check_characteristics(struct dasd_device *device)
121 {
122         struct dasd_block *block;
123         struct dasd_fba_private *private;
124         struct ccw_device *cdev = device->cdev;
125         void *rdc_data;
126         int rc;
127
128         private = (struct dasd_fba_private *) device->private;
129         if (private == NULL) {
130                 private = kzalloc(sizeof(struct dasd_fba_private),
131                                   GFP_KERNEL | GFP_DMA);
132                 if (private == NULL) {
133                         dev_warn(&device->cdev->dev,
134                                  "Allocating memory for private DASD "
135                                  "data failed\n");
136                         return -ENOMEM;
137                 }
138                 device->private = (void *) private;
139         }
140         block = dasd_alloc_block();
141         if (IS_ERR(block)) {
142                 DBF_EVENT(DBF_WARNING, "could not allocate dasd block "
143                           "structure for device: %s",
144                           dev_name(&device->cdev->dev));
145                 device->private = NULL;
146                 kfree(private);
147                 return PTR_ERR(block);
148         }
149         device->block = block;
150         block->base = device;
151
152         /* Read Device Characteristics */
153         rdc_data = (void *) &(private->rdc_data);
154         rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
155         if (rc) {
156                 DBF_EVENT(DBF_WARNING, "Read device characteristics returned "
157                           "error %d for device: %s",
158                           rc, dev_name(&device->cdev->dev));
159                 device->block = NULL;
160                 dasd_free_block(block);
161                 device->private = NULL;
162                 kfree(private);
163                 return rc;
164         }
165
166         dev_info(&device->cdev->dev,
167                  "New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
168                  "and %d B/blk\n",
169                  cdev->id.dev_type,
170                  cdev->id.dev_model,
171                  cdev->id.cu_type,
172                  cdev->id.cu_model,
173                  ((private->rdc_data.blk_bdsa *
174                    (private->rdc_data.blk_size >> 9)) >> 11),
175                  private->rdc_data.blk_size);
176         return 0;
177 }
178
179 static int dasd_fba_do_analysis(struct dasd_block *block)
180 {
181         struct dasd_fba_private *private;
182         int sb, rc;
183
184         private = (struct dasd_fba_private *) block->base->private;
185         rc = dasd_check_blocksize(private->rdc_data.blk_size);
186         if (rc) {
187                 DBF_DEV_EVENT(DBF_WARNING, block->base, "unknown blocksize %d",
188                             private->rdc_data.blk_size);
189                 return rc;
190         }
191         block->blocks = private->rdc_data.blk_bdsa;
192         block->bp_block = private->rdc_data.blk_size;
193         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
194         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
195                 block->s2b_shift++;
196         return 0;
197 }
198
199 static int dasd_fba_fill_geometry(struct dasd_block *block,
200                                   struct hd_geometry *geo)
201 {
202         if (dasd_check_blocksize(block->bp_block) != 0)
203                 return -EINVAL;
204         geo->cylinders = (block->blocks << block->s2b_shift) >> 10;
205         geo->heads = 16;
206         geo->sectors = 128 >> block->s2b_shift;
207         return 0;
208 }
209
210 static dasd_erp_fn_t
211 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
212 {
213         return dasd_default_erp_action;
214 }
215
216 static dasd_erp_fn_t
217 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
218 {
219         if (cqr->function == dasd_default_erp_action)
220                 return dasd_default_erp_postaction;
221
222         DBF_DEV_EVENT(DBF_WARNING, cqr->startdev, "unknown ERP action %p",
223                     cqr->function);
224         return NULL;
225 }
226
227 static void dasd_fba_handle_unsolicited_interrupt(struct dasd_device *device,
228                                                    struct irb *irb)
229 {
230         char mask;
231
232         /* first of all check for state change pending interrupt */
233         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
234         if ((irb->scsw.cmd.dstat & mask) == mask) {
235                 dasd_generic_handle_state_change(device);
236                 return;
237         }
238
239         /* check for unsolicited interrupts */
240         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
241                     "unsolicited interrupt received");
242         device->discipline->dump_sense_dbf(device, NULL, irb, "unsolicited");
243         dasd_schedule_device_bh(device);
244         return;
245 };
246
247 static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
248                                               struct dasd_block *block,
249                                               struct request *req)
250 {
251         struct dasd_fba_private *private;
252         unsigned long *idaws;
253         struct LO_fba_data *LO_data;
254         struct dasd_ccw_req *cqr;
255         struct ccw1 *ccw;
256         struct req_iterator iter;
257         struct bio_vec *bv;
258         char *dst;
259         int count, cidaw, cplength, datasize;
260         sector_t recid, first_rec, last_rec;
261         unsigned int blksize, off;
262         unsigned char cmd;
263
264         private = (struct dasd_fba_private *) block->base->private;
265         if (rq_data_dir(req) == READ) {
266                 cmd = DASD_FBA_CCW_READ;
267         } else if (rq_data_dir(req) == WRITE) {
268                 cmd = DASD_FBA_CCW_WRITE;
269         } else
270                 return ERR_PTR(-EINVAL);
271         blksize = block->bp_block;
272         /* Calculate record id of first and last block. */
273         first_rec = blk_rq_pos(req) >> block->s2b_shift;
274         last_rec =
275                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
276         /* Check struct bio and count the number of blocks for the request. */
277         count = 0;
278         cidaw = 0;
279         rq_for_each_segment(bv, req, iter) {
280                 if (bv->bv_len & (blksize - 1))
281                         /* Fba can only do full blocks. */
282                         return ERR_PTR(-EINVAL);
283                 count += bv->bv_len >> (block->s2b_shift + 9);
284 #if defined(CONFIG_64BIT)
285                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
286                         cidaw += bv->bv_len / blksize;
287 #endif
288         }
289         /* Paranoia. */
290         if (count != last_rec - first_rec + 1)
291                 return ERR_PTR(-EINVAL);
292         /* 1x define extent + 1x locate record + number of blocks */
293         cplength = 2 + count;
294         /* 1x define extent + 1x locate record */
295         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
296                 cidaw * sizeof(unsigned long);
297         /*
298          * Find out number of additional locate record ccws if the device
299          * can't do data chaining.
300          */
301         if (private->rdc_data.mode.bits.data_chain == 0) {
302                 cplength += count - 1;
303                 datasize += (count - 1)*sizeof(struct LO_fba_data);
304         }
305         /* Allocate the ccw request. */
306         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
307                                    cplength, datasize, memdev);
308         if (IS_ERR(cqr))
309                 return cqr;
310         ccw = cqr->cpaddr;
311         /* First ccw is define extent. */
312         define_extent(ccw++, cqr->data, rq_data_dir(req),
313                       block->bp_block, blk_rq_pos(req), blk_rq_sectors(req));
314         /* Build locate_record + read/write ccws. */
315         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
316         LO_data = (struct LO_fba_data *) (idaws + cidaw);
317         /* Locate record for all blocks for smart devices. */
318         if (private->rdc_data.mode.bits.data_chain != 0) {
319                 ccw[-1].flags |= CCW_FLAG_CC;
320                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
321         }
322         recid = first_rec;
323         rq_for_each_segment(bv, req, iter) {
324                 dst = page_address(bv->bv_page) + bv->bv_offset;
325                 if (dasd_page_cache) {
326                         char *copy = kmem_cache_alloc(dasd_page_cache,
327                                                       GFP_DMA | __GFP_NOWARN);
328                         if (copy && rq_data_dir(req) == WRITE)
329                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
330                         if (copy)
331                                 dst = copy + bv->bv_offset;
332                 }
333                 for (off = 0; off < bv->bv_len; off += blksize) {
334                         /* Locate record for stupid devices. */
335                         if (private->rdc_data.mode.bits.data_chain == 0) {
336                                 ccw[-1].flags |= CCW_FLAG_CC;
337                                 locate_record(ccw, LO_data++,
338                                               rq_data_dir(req),
339                                               recid - first_rec, 1);
340                                 ccw->flags = CCW_FLAG_CC;
341                                 ccw++;
342                         } else {
343                                 if (recid > first_rec)
344                                         ccw[-1].flags |= CCW_FLAG_DC;
345                                 else
346                                         ccw[-1].flags |= CCW_FLAG_CC;
347                         }
348                         ccw->cmd_code = cmd;
349                         ccw->count = block->bp_block;
350                         if (idal_is_needed(dst, blksize)) {
351                                 ccw->cda = (__u32)(addr_t) idaws;
352                                 ccw->flags = CCW_FLAG_IDA;
353                                 idaws = idal_create_words(idaws, dst, blksize);
354                         } else {
355                                 ccw->cda = (__u32)(addr_t) dst;
356                                 ccw->flags = 0;
357                         }
358                         ccw++;
359                         dst += blksize;
360                         recid++;
361                 }
362         }
363         if (blk_noretry_request(req) ||
364             block->base->features & DASD_FEATURE_FAILFAST)
365                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
366         cqr->startdev = memdev;
367         cqr->memdev = memdev;
368         cqr->block = block;
369         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
370         cqr->retries = 32;
371         cqr->buildclk = get_clock();
372         cqr->status = DASD_CQR_FILLED;
373         return cqr;
374 }
375
376 static int
377 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
378 {
379         struct dasd_fba_private *private;
380         struct ccw1 *ccw;
381         struct req_iterator iter;
382         struct bio_vec *bv;
383         char *dst, *cda;
384         unsigned int blksize, off;
385         int status;
386
387         if (!dasd_page_cache)
388                 goto out;
389         private = (struct dasd_fba_private *) cqr->block->base->private;
390         blksize = cqr->block->bp_block;
391         ccw = cqr->cpaddr;
392         /* Skip over define extent & locate record. */
393         ccw++;
394         if (private->rdc_data.mode.bits.data_chain != 0)
395                 ccw++;
396         rq_for_each_segment(bv, req, iter) {
397                 dst = page_address(bv->bv_page) + bv->bv_offset;
398                 for (off = 0; off < bv->bv_len; off += blksize) {
399                         /* Skip locate record. */
400                         if (private->rdc_data.mode.bits.data_chain == 0)
401                                 ccw++;
402                         if (dst) {
403                                 if (ccw->flags & CCW_FLAG_IDA)
404                                         cda = *((char **)((addr_t) ccw->cda));
405                                 else
406                                         cda = (char *)((addr_t) ccw->cda);
407                                 if (dst != cda) {
408                                         if (rq_data_dir(req) == READ)
409                                                 memcpy(dst, cda, bv->bv_len);
410                                         kmem_cache_free(dasd_page_cache,
411                                             (void *)((addr_t)cda & PAGE_MASK));
412                                 }
413                                 dst = NULL;
414                         }
415                         ccw++;
416                 }
417         }
418 out:
419         status = cqr->status == DASD_CQR_DONE;
420         dasd_sfree_request(cqr, cqr->memdev);
421         return status;
422 }
423
424 static void dasd_fba_handle_terminated_request(struct dasd_ccw_req *cqr)
425 {
426         cqr->status = DASD_CQR_FILLED;
427 };
428
429 static int
430 dasd_fba_fill_info(struct dasd_device * device,
431                    struct dasd_information2_t * info)
432 {
433         info->label_block = 1;
434         info->FBA_layout = 1;
435         info->format = DASD_FORMAT_LDL;
436         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
437         memcpy(info->characteristics,
438                &((struct dasd_fba_private *) device->private)->rdc_data,
439                sizeof (struct dasd_fba_characteristics));
440         info->confdata_size = 0;
441         return 0;
442 }
443
444 static void
445 dasd_fba_dump_sense_dbf(struct dasd_device *device, struct dasd_ccw_req *req,
446                          struct irb *irb, char *reason)
447 {
448         int sl;
449         if (irb->esw.esw0.erw.cons) {
450                 for (sl = 0; sl < 4; sl++) {
451                         DBF_DEV_EVENT(DBF_EMERG, device,
452                                       "%s: %08x %08x %08x %08x",
453                                       reason, irb->ecw[8 * 0], irb->ecw[8 * 1],
454                                       irb->ecw[8 * 2], irb->ecw[8 * 3]);
455                 }
456         } else {
457                 DBF_DEV_EVENT(DBF_EMERG, device, "%s",
458                               "SORRY - NO VALID SENSE AVAILABLE\n");
459         }
460 }
461
462
463 static void
464 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
465                     struct irb *irb)
466 {
467         char *page;
468         struct ccw1 *act, *end, *last;
469         int len, sl, sct, count;
470
471         page = (char *) get_zeroed_page(GFP_ATOMIC);
472         if (page == NULL) {
473                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
474                             "No memory to dump sense data");
475                 return;
476         }
477         len = sprintf(page, KERN_ERR PRINTK_HEADER
478                       " I/O status report for device %s:\n",
479                       dev_name(&device->cdev->dev));
480         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
481                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
482                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
483         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
484                        " device %s: Failing CCW: %p\n",
485                        dev_name(&device->cdev->dev),
486                        (void *) (addr_t) irb->scsw.cmd.cpa);
487         if (irb->esw.esw0.erw.cons) {
488                 for (sl = 0; sl < 4; sl++) {
489                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
490                                        " Sense(hex) %2d-%2d:",
491                                        (8 * sl), ((8 * sl) + 7));
492
493                         for (sct = 0; sct < 8; sct++) {
494                                 len += sprintf(page + len, " %02x",
495                                                irb->ecw[8 * sl + sct]);
496                         }
497                         len += sprintf(page + len, "\n");
498                 }
499         } else {
500                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
501                                " SORRY - NO VALID SENSE AVAILABLE\n");
502         }
503         printk(KERN_ERR "%s", page);
504
505         /* dump the Channel Program */
506         /* print first CCWs (maximum 8) */
507         act = req->cpaddr;
508         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
509         end = min(act + 8, last);
510         len = sprintf(page, KERN_ERR PRINTK_HEADER
511                       " Related CP in req: %p\n", req);
512         while (act <= end) {
513                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
514                                " CCW %p: %08X %08X DAT:",
515                                act, ((int *) act)[0], ((int *) act)[1]);
516                 for (count = 0; count < 32 && count < act->count;
517                      count += sizeof(int))
518                         len += sprintf(page + len, " %08X",
519                                        ((int *) (addr_t) act->cda)
520                                        [(count>>2)]);
521                 len += sprintf(page + len, "\n");
522                 act++;
523         }
524         printk(KERN_ERR "%s", page);
525
526
527         /* print failing CCW area */
528         len = 0;
529         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2) {
530                 act = ((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa) - 2;
531                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
532         }
533         end = min((struct ccw1 *)(addr_t) irb->scsw.cmd.cpa + 2, last);
534         while (act <= end) {
535                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
536                                " CCW %p: %08X %08X DAT:",
537                                act, ((int *) act)[0], ((int *) act)[1]);
538                 for (count = 0; count < 32 && count < act->count;
539                      count += sizeof(int))
540                         len += sprintf(page + len, " %08X",
541                                        ((int *) (addr_t) act->cda)
542                                        [(count>>2)]);
543                 len += sprintf(page + len, "\n");
544                 act++;
545         }
546
547         /* print last CCWs */
548         if (act <  last - 2) {
549                 act = last - 2;
550                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
551         }
552         while (act <= last) {
553                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
554                                " CCW %p: %08X %08X DAT:",
555                                act, ((int *) act)[0], ((int *) act)[1]);
556                 for (count = 0; count < 32 && count < act->count;
557                      count += sizeof(int))
558                         len += sprintf(page + len, " %08X",
559                                        ((int *) (addr_t) act->cda)
560                                        [(count>>2)]);
561                 len += sprintf(page + len, "\n");
562                 act++;
563         }
564         if (len > 0)
565                 printk(KERN_ERR "%s", page);
566         free_page((unsigned long) page);
567 }
568
569 /*
570  * max_blocks is dependent on the amount of storage that is available
571  * in the static io buffer for each device. Currently each device has
572  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
573  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
574  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
575  * addition we have one define extent ccw + 16 bytes of data and a
576  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
577  * That makes:
578  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
579  * We want to fit two into the available memory so that we can immediately
580  * start the next request if one finishes off. That makes 100.1 blocks
581  * for one request. Give a little safety and the result is 96.
582  */
583 static struct dasd_discipline dasd_fba_discipline = {
584         .owner = THIS_MODULE,
585         .name = "FBA ",
586         .ebcname = "FBA ",
587         .max_blocks = 96,
588         .check_device = dasd_fba_check_characteristics,
589         .do_analysis = dasd_fba_do_analysis,
590         .fill_geometry = dasd_fba_fill_geometry,
591         .start_IO = dasd_start_IO,
592         .term_IO = dasd_term_IO,
593         .handle_terminated_request = dasd_fba_handle_terminated_request,
594         .erp_action = dasd_fba_erp_action,
595         .erp_postaction = dasd_fba_erp_postaction,
596         .handle_unsolicited_interrupt = dasd_fba_handle_unsolicited_interrupt,
597         .build_cp = dasd_fba_build_cp,
598         .free_cp = dasd_fba_free_cp,
599         .dump_sense = dasd_fba_dump_sense,
600         .dump_sense_dbf = dasd_fba_dump_sense_dbf,
601         .fill_info = dasd_fba_fill_info,
602 };
603
604 static int __init
605 dasd_fba_init(void)
606 {
607         ASCEBC(dasd_fba_discipline.ebcname, 4);
608         return ccw_driver_register(&dasd_fba_driver);
609 }
610
611 static void __exit
612 dasd_fba_cleanup(void)
613 {
614         ccw_driver_unregister(&dasd_fba_driver);
615 }
616
617 module_init(dasd_fba_init);
618 module_exit(dasd_fba_cleanup);