atomic: use <linux/atomic.h>
[linux-2.6.git] / drivers / block / cciss_scsi.c
1 /*
2  *    Disk Array driver for HP Smart Array controllers, SCSI Tape module.
3  *    (C) Copyright 2001, 2007 Hewlett-Packard Development Company, L.P.
4  *
5  *    This program is free software; you can redistribute it and/or modify
6  *    it under the terms of the GNU General Public License as published by
7  *    the Free Software Foundation; version 2 of the License.
8  *
9  *    This program is distributed in the hope that it will be useful,
10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
11  *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  *    General Public License for more details.
13  *
14  *    You should have received a copy of the GNU General Public License
15  *    along with this program; if not, write to the Free Software
16  *    Foundation, Inc., 59 Temple Place, Suite 300, Boston, MA
17  *    02111-1307, USA.
18  *
19  *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
20  *    
21  *    Author: Stephen M. Cameron
22  */
23 #ifdef CONFIG_CISS_SCSI_TAPE
24
25 /* Here we have code to present the driver as a scsi driver 
26    as it is simultaneously presented as a block driver.  The 
27    reason for doing this is to allow access to SCSI tape drives
28    through the array controller.  Note in particular, neither 
29    physical nor logical disks are presented through the scsi layer. */
30
31 #include <linux/timer.h>
32 #include <linux/completion.h>
33 #include <linux/slab.h>
34 #include <linux/string.h>
35
36 #include <linux/atomic.h>
37
38 #include <scsi/scsi_cmnd.h>
39 #include <scsi/scsi_device.h>
40 #include <scsi/scsi_host.h> 
41
42 #include "cciss_scsi.h"
43
44 #define CCISS_ABORT_MSG 0x00
45 #define CCISS_RESET_MSG 0x01
46
47 static int fill_cmd(ctlr_info_t *h, CommandList_struct *c, __u8 cmd, void *buff,
48         size_t size,
49         __u8 page_code, unsigned char *scsi3addr,
50         int cmd_type);
51
52 static CommandList_struct *cmd_alloc(ctlr_info_t *h);
53 static CommandList_struct *cmd_special_alloc(ctlr_info_t *h);
54 static void cmd_free(ctlr_info_t *h, CommandList_struct *c);
55 static void cmd_special_free(ctlr_info_t *h, CommandList_struct *c);
56
57 static int cciss_scsi_proc_info(
58                 struct Scsi_Host *sh,
59                 char *buffer, /* data buffer */
60                 char **start,      /* where data in buffer starts */
61                 off_t offset,      /* offset from start of imaginary file */
62                 int length,        /* length of data in buffer */
63                 int func);         /* 0 == read, 1 == write */
64
65 static int cciss_scsi_queue_command (struct Scsi_Host *h,
66                                      struct scsi_cmnd *cmd);
67 static int cciss_eh_device_reset_handler(struct scsi_cmnd *);
68 static int cciss_eh_abort_handler(struct scsi_cmnd *);
69
70 static struct cciss_scsi_hba_t ccissscsi[MAX_CTLR] = {
71         { .name = "cciss0", .ndevices = 0 },
72         { .name = "cciss1", .ndevices = 0 },
73         { .name = "cciss2", .ndevices = 0 },
74         { .name = "cciss3", .ndevices = 0 },
75         { .name = "cciss4", .ndevices = 0 },
76         { .name = "cciss5", .ndevices = 0 },
77         { .name = "cciss6", .ndevices = 0 },
78         { .name = "cciss7", .ndevices = 0 },
79 };
80
81 static struct scsi_host_template cciss_driver_template = {
82         .module                 = THIS_MODULE,
83         .name                   = "cciss",
84         .proc_name              = "cciss",
85         .proc_info              = cciss_scsi_proc_info,
86         .queuecommand           = cciss_scsi_queue_command,
87         .this_id                = 7,
88         .cmd_per_lun            = 1,
89         .use_clustering         = DISABLE_CLUSTERING,
90         /* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */
91         .eh_device_reset_handler= cciss_eh_device_reset_handler,
92         .eh_abort_handler       = cciss_eh_abort_handler,
93 };
94
95 #pragma pack(1)
96
97 #define SCSI_PAD_32 8
98 #define SCSI_PAD_64 8
99
100 struct cciss_scsi_cmd_stack_elem_t {
101         CommandList_struct cmd;
102         ErrorInfo_struct Err;
103         __u32 busaddr;
104         int cmdindex;
105         u8 pad[IS_32_BIT * SCSI_PAD_32 + IS_64_BIT * SCSI_PAD_64];
106 };
107
108 #pragma pack()
109
110 #pragma pack(1)
111 struct cciss_scsi_cmd_stack_t {
112         struct cciss_scsi_cmd_stack_elem_t *pool;
113         struct cciss_scsi_cmd_stack_elem_t **elem;
114         dma_addr_t cmd_pool_handle;
115         int top;
116         int nelems;
117 };
118 #pragma pack()
119
120 struct cciss_scsi_adapter_data_t {
121         struct Scsi_Host *scsi_host;
122         struct cciss_scsi_cmd_stack_t cmd_stack;
123         SGDescriptor_struct **cmd_sg_list;
124         int registered;
125         spinlock_t lock; // to protect ccissscsi[ctlr]; 
126 };
127
128 #define CPQ_TAPE_LOCK(h, flags) spin_lock_irqsave( \
129         &h->scsi_ctlr->lock, flags);
130 #define CPQ_TAPE_UNLOCK(h, flags) spin_unlock_irqrestore( \
131         &h->scsi_ctlr->lock, flags);
132
133 static CommandList_struct *
134 scsi_cmd_alloc(ctlr_info_t *h)
135 {
136         /* assume only one process in here at a time, locking done by caller. */
137         /* use h->lock */
138         /* might be better to rewrite how we allocate scsi commands in a way that */
139         /* needs no locking at all. */
140
141         /* take the top memory chunk off the stack and return it, if any. */
142         struct cciss_scsi_cmd_stack_elem_t *c;
143         struct cciss_scsi_adapter_data_t *sa;
144         struct cciss_scsi_cmd_stack_t *stk;
145         u64bit temp64;
146
147         sa = h->scsi_ctlr;
148         stk = &sa->cmd_stack; 
149
150         if (stk->top < 0) 
151                 return NULL;
152         c = stk->elem[stk->top];        
153         /* memset(c, 0, sizeof(*c)); */
154         memset(&c->cmd, 0, sizeof(c->cmd));
155         memset(&c->Err, 0, sizeof(c->Err));
156         /* set physical addr of cmd and addr of scsi parameters */
157         c->cmd.busaddr = c->busaddr; 
158         c->cmd.cmdindex = c->cmdindex;
159         /* (__u32) (stk->cmd_pool_handle + 
160                 (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */
161
162         temp64.val = (__u64) (c->busaddr + sizeof(CommandList_struct));
163         /* (__u64) (stk->cmd_pool_handle + 
164                 (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top) +
165                  sizeof(CommandList_struct)); */
166         stk->top--;
167         c->cmd.ErrDesc.Addr.lower = temp64.val32.lower;
168         c->cmd.ErrDesc.Addr.upper = temp64.val32.upper;
169         c->cmd.ErrDesc.Len = sizeof(ErrorInfo_struct);
170         
171         c->cmd.ctlr = h->ctlr;
172         c->cmd.err_info = &c->Err;
173
174         return (CommandList_struct *) c;
175 }
176
177 static void 
178 scsi_cmd_free(ctlr_info_t *h, CommandList_struct *c)
179 {
180         /* assume only one process in here at a time, locking done by caller. */
181         /* use h->lock */
182         /* drop the free memory chunk on top of the stack. */
183
184         struct cciss_scsi_adapter_data_t *sa;
185         struct cciss_scsi_cmd_stack_t *stk;
186
187         sa = h->scsi_ctlr;
188         stk = &sa->cmd_stack; 
189         stk->top++;
190         if (stk->top >= stk->nelems) {
191                 dev_err(&h->pdev->dev,
192                         "scsi_cmd_free called too many times.\n");
193                 BUG();
194         }
195         stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) c;
196 }
197
198 static int
199 scsi_cmd_stack_setup(ctlr_info_t *h, struct cciss_scsi_adapter_data_t *sa)
200 {
201         int i;
202         struct cciss_scsi_cmd_stack_t *stk;
203         size_t size;
204
205         stk = &sa->cmd_stack;
206         stk->nelems = cciss_tape_cmds + 2;
207         sa->cmd_sg_list = cciss_allocate_sg_chain_blocks(h,
208                 h->chainsize, stk->nelems);
209         if (!sa->cmd_sg_list && h->chainsize > 0)
210                 return -ENOMEM;
211
212         size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * stk->nelems;
213
214         /* Check alignment, see cciss_cmd.h near CommandList_struct def. */
215         BUILD_BUG_ON((sizeof(*stk->pool) % COMMANDLIST_ALIGNMENT) != 0);
216         /* pci_alloc_consistent guarantees 32-bit DMA address will be used */
217         stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
218                 pci_alloc_consistent(h->pdev, size, &stk->cmd_pool_handle);
219
220         if (stk->pool == NULL) {
221                 cciss_free_sg_chain_blocks(sa->cmd_sg_list, stk->nelems);
222                 sa->cmd_sg_list = NULL;
223                 return -ENOMEM;
224         }
225         stk->elem = kmalloc(sizeof(stk->elem[0]) * stk->nelems, GFP_KERNEL);
226         if (!stk->elem) {
227                 pci_free_consistent(h->pdev, size, stk->pool,
228                 stk->cmd_pool_handle);
229                 return -1;
230         }
231         for (i = 0; i < stk->nelems; i++) {
232                 stk->elem[i] = &stk->pool[i];
233                 stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle + 
234                         (sizeof(struct cciss_scsi_cmd_stack_elem_t) * i));
235                 stk->elem[i]->cmdindex = i;
236         }
237         stk->top = stk->nelems-1;
238         return 0;
239 }
240
241 static void
242 scsi_cmd_stack_free(ctlr_info_t *h)
243 {
244         struct cciss_scsi_adapter_data_t *sa;
245         struct cciss_scsi_cmd_stack_t *stk;
246         size_t size;
247
248         sa = h->scsi_ctlr;
249         stk = &sa->cmd_stack; 
250         if (stk->top != stk->nelems-1) {
251                 dev_warn(&h->pdev->dev,
252                         "bug: %d scsi commands are still outstanding.\n",
253                         stk->nelems - stk->top);
254         }
255         size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * stk->nelems;
256
257         pci_free_consistent(h->pdev, size, stk->pool, stk->cmd_pool_handle);
258         stk->pool = NULL;
259         cciss_free_sg_chain_blocks(sa->cmd_sg_list, stk->nelems);
260         kfree(stk->elem);
261         stk->elem = NULL;
262 }
263
264 #if 0
265 static int xmargin=8;
266 static int amargin=60;
267
268 static void
269 print_bytes (unsigned char *c, int len, int hex, int ascii)
270 {
271
272         int i;
273         unsigned char *x;
274
275         if (hex)
276         {
277                 x = c;
278                 for (i=0;i<len;i++)
279                 {
280                         if ((i % xmargin) == 0 && i>0) printk("\n");
281                         if ((i % xmargin) == 0) printk("0x%04x:", i);
282                         printk(" %02x", *x);
283                         x++;
284                 }
285                 printk("\n");
286         }
287         if (ascii)
288         {
289                 x = c;
290                 for (i=0;i<len;i++)
291                 {
292                         if ((i % amargin) == 0 && i>0) printk("\n");
293                         if ((i % amargin) == 0) printk("0x%04x:", i);
294                         if (*x > 26 && *x < 128) printk("%c", *x);
295                         else printk(".");
296                         x++;
297                 }
298                 printk("\n");
299         }
300 }
301
302 static void
303 print_cmd(CommandList_struct *cp)
304 {
305         printk("queue:%d\n", cp->Header.ReplyQueue);
306         printk("sglist:%d\n", cp->Header.SGList);
307         printk("sgtot:%d\n", cp->Header.SGTotal);
308         printk("Tag:0x%08x/0x%08x\n", cp->Header.Tag.upper, 
309                         cp->Header.Tag.lower);
310         printk("LUN:0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
311                 cp->Header.LUN.LunAddrBytes[0],
312                 cp->Header.LUN.LunAddrBytes[1],
313                 cp->Header.LUN.LunAddrBytes[2],
314                 cp->Header.LUN.LunAddrBytes[3],
315                 cp->Header.LUN.LunAddrBytes[4],
316                 cp->Header.LUN.LunAddrBytes[5],
317                 cp->Header.LUN.LunAddrBytes[6],
318                 cp->Header.LUN.LunAddrBytes[7]);
319         printk("CDBLen:%d\n", cp->Request.CDBLen);
320         printk("Type:%d\n",cp->Request.Type.Type);
321         printk("Attr:%d\n",cp->Request.Type.Attribute);
322         printk(" Dir:%d\n",cp->Request.Type.Direction);
323         printk("Timeout:%d\n",cp->Request.Timeout);
324         printk( "CDB: %02x %02x %02x %02x %02x %02x %02x %02x"
325                 " %02x %02x %02x %02x %02x %02x %02x %02x\n",
326                 cp->Request.CDB[0], cp->Request.CDB[1],
327                 cp->Request.CDB[2], cp->Request.CDB[3],
328                 cp->Request.CDB[4], cp->Request.CDB[5],
329                 cp->Request.CDB[6], cp->Request.CDB[7],
330                 cp->Request.CDB[8], cp->Request.CDB[9],
331                 cp->Request.CDB[10], cp->Request.CDB[11],
332                 cp->Request.CDB[12], cp->Request.CDB[13],
333                 cp->Request.CDB[14], cp->Request.CDB[15]),
334         printk("edesc.Addr: 0x%08x/0%08x, Len  = %d\n", 
335                 cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower, 
336                         cp->ErrDesc.Len);
337         printk("sgs..........Errorinfo:\n");
338         printk("scsistatus:%d\n", cp->err_info->ScsiStatus);
339         printk("senselen:%d\n", cp->err_info->SenseLen);
340         printk("cmd status:%d\n", cp->err_info->CommandStatus);
341         printk("resid cnt:%d\n", cp->err_info->ResidualCnt);
342         printk("offense size:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_size);
343         printk("offense byte:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_num);
344         printk("offense value:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_value);
345                         
346 }
347
348 #endif
349
350 static int 
351 find_bus_target_lun(ctlr_info_t *h, int *bus, int *target, int *lun)
352 {
353         /* finds an unused bus, target, lun for a new device */
354         /* assumes h->scsi_ctlr->lock is held */
355         int i, found=0;
356         unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA];
357
358         memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA);
359
360         target_taken[SELF_SCSI_ID] = 1; 
361         for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++)
362                 target_taken[ccissscsi[h->ctlr].dev[i].target] = 1;
363         
364         for (i = 0; i < CCISS_MAX_SCSI_DEVS_PER_HBA; i++) {
365                 if (!target_taken[i]) {
366                         *bus = 0; *target=i; *lun = 0; found=1;
367                         break;
368                 }
369         }
370         return (!found);        
371 }
372 struct scsi2map {
373         char scsi3addr[8];
374         int bus, target, lun;
375 };
376
377 static int 
378 cciss_scsi_add_entry(ctlr_info_t *h, int hostno,
379                 struct cciss_scsi_dev_t *device,
380                 struct scsi2map *added, int *nadded)
381 {
382         /* assumes h->scsi_ctlr->lock is held */
383         int n = ccissscsi[h->ctlr].ndevices;
384         struct cciss_scsi_dev_t *sd;
385         int i, bus, target, lun;
386         unsigned char addr1[8], addr2[8];
387
388         if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
389                 dev_warn(&h->pdev->dev, "Too many devices, "
390                         "some will be inaccessible.\n");
391                 return -1;
392         }
393
394         bus = target = -1;
395         lun = 0;
396         /* Is this device a non-zero lun of a multi-lun device */
397         /* byte 4 of the 8-byte LUN addr will contain the logical unit no. */
398         if (device->scsi3addr[4] != 0) {
399                 /* Search through our list and find the device which */
400                 /* has the same 8 byte LUN address, excepting byte 4. */
401                 /* Assign the same bus and target for this new LUN. */
402                 /* Use the logical unit number from the firmware. */
403                 memcpy(addr1, device->scsi3addr, 8);
404                 addr1[4] = 0;
405                 for (i = 0; i < n; i++) {
406                         sd = &ccissscsi[h->ctlr].dev[i];
407                         memcpy(addr2, sd->scsi3addr, 8);
408                         addr2[4] = 0;
409                         /* differ only in byte 4? */
410                         if (memcmp(addr1, addr2, 8) == 0) {
411                                 bus = sd->bus;
412                                 target = sd->target;
413                                 lun = device->scsi3addr[4];
414                                 break;
415                         }
416                 }
417         }
418
419         sd = &ccissscsi[h->ctlr].dev[n];
420         if (lun == 0) {
421                 if (find_bus_target_lun(h,
422                         &sd->bus, &sd->target, &sd->lun) != 0)
423                         return -1;
424         } else {
425                 sd->bus = bus;
426                 sd->target = target;
427                 sd->lun = lun;
428         }
429         added[*nadded].bus = sd->bus;
430         added[*nadded].target = sd->target;
431         added[*nadded].lun = sd->lun;
432         (*nadded)++;
433
434         memcpy(sd->scsi3addr, device->scsi3addr, 8);
435         memcpy(sd->vendor, device->vendor, sizeof(sd->vendor));
436         memcpy(sd->revision, device->revision, sizeof(sd->revision));
437         memcpy(sd->device_id, device->device_id, sizeof(sd->device_id));
438         sd->devtype = device->devtype;
439
440         ccissscsi[h->ctlr].ndevices++;
441
442         /* initially, (before registering with scsi layer) we don't 
443            know our hostno and we don't want to print anything first 
444            time anyway (the scsi layer's inquiries will show that info) */
445         if (hostno != -1)
446                 dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.\n",
447                         scsi_device_type(sd->devtype), hostno,
448                         sd->bus, sd->target, sd->lun);
449         return 0;
450 }
451
452 static void
453 cciss_scsi_remove_entry(ctlr_info_t *h, int hostno, int entry,
454         struct scsi2map *removed, int *nremoved)
455 {
456         /* assumes h->ctlr]->scsi_ctlr->lock is held */
457         int i;
458         struct cciss_scsi_dev_t sd;
459
460         if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return;
461         sd = ccissscsi[h->ctlr].dev[entry];
462         removed[*nremoved].bus    = sd.bus;
463         removed[*nremoved].target = sd.target;
464         removed[*nremoved].lun    = sd.lun;
465         (*nremoved)++;
466         for (i = entry; i < ccissscsi[h->ctlr].ndevices-1; i++)
467                 ccissscsi[h->ctlr].dev[i] = ccissscsi[h->ctlr].dev[i+1];
468         ccissscsi[h->ctlr].ndevices--;
469         dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.\n",
470                 scsi_device_type(sd.devtype), hostno,
471                         sd.bus, sd.target, sd.lun);
472 }
473
474
475 #define SCSI3ADDR_EQ(a,b) ( \
476         (a)[7] == (b)[7] && \
477         (a)[6] == (b)[6] && \
478         (a)[5] == (b)[5] && \
479         (a)[4] == (b)[4] && \
480         (a)[3] == (b)[3] && \
481         (a)[2] == (b)[2] && \
482         (a)[1] == (b)[1] && \
483         (a)[0] == (b)[0])
484
485 static void fixup_botched_add(ctlr_info_t *h, char *scsi3addr)
486 {
487         /* called when scsi_add_device fails in order to re-adjust */
488         /* ccissscsi[] to match the mid layer's view. */
489         unsigned long flags;
490         int i, j;
491         CPQ_TAPE_LOCK(h, flags);
492         for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
493                 if (memcmp(scsi3addr,
494                                 ccissscsi[h->ctlr].dev[i].scsi3addr, 8) == 0) {
495                         for (j = i; j < ccissscsi[h->ctlr].ndevices-1; j++)
496                                 ccissscsi[h->ctlr].dev[j] =
497                                         ccissscsi[h->ctlr].dev[j+1];
498                         ccissscsi[h->ctlr].ndevices--;
499                         break;
500                 }
501         }
502         CPQ_TAPE_UNLOCK(h, flags);
503 }
504
505 static int device_is_the_same(struct cciss_scsi_dev_t *dev1,
506         struct cciss_scsi_dev_t *dev2)
507 {
508         return dev1->devtype == dev2->devtype &&
509                 memcmp(dev1->scsi3addr, dev2->scsi3addr,
510                         sizeof(dev1->scsi3addr)) == 0 &&
511                 memcmp(dev1->device_id, dev2->device_id,
512                         sizeof(dev1->device_id)) == 0 &&
513                 memcmp(dev1->vendor, dev2->vendor,
514                         sizeof(dev1->vendor)) == 0 &&
515                 memcmp(dev1->model, dev2->model,
516                         sizeof(dev1->model)) == 0 &&
517                 memcmp(dev1->revision, dev2->revision,
518                         sizeof(dev1->revision)) == 0;
519 }
520
521 static int
522 adjust_cciss_scsi_table(ctlr_info_t *h, int hostno,
523         struct cciss_scsi_dev_t sd[], int nsds)
524 {
525         /* sd contains scsi3 addresses and devtypes, but
526            bus target and lun are not filled in.  This funciton
527            takes what's in sd to be the current and adjusts
528            ccissscsi[] to be in line with what's in sd. */ 
529
530         int i,j, found, changes=0;
531         struct cciss_scsi_dev_t *csd;
532         unsigned long flags;
533         struct scsi2map *added, *removed;
534         int nadded, nremoved;
535         struct Scsi_Host *sh = NULL;
536
537         added = kzalloc(sizeof(*added) * CCISS_MAX_SCSI_DEVS_PER_HBA,
538                         GFP_KERNEL);
539         removed = kzalloc(sizeof(*removed) * CCISS_MAX_SCSI_DEVS_PER_HBA,
540                         GFP_KERNEL);
541
542         if (!added || !removed) {
543                 dev_warn(&h->pdev->dev,
544                         "Out of memory in adjust_cciss_scsi_table\n");
545                 goto free_and_out;
546         }
547
548         CPQ_TAPE_LOCK(h, flags);
549
550         if (hostno != -1)  /* if it's not the first time... */
551                 sh = h->scsi_ctlr->scsi_host;
552
553         /* find any devices in ccissscsi[] that are not in 
554            sd[] and remove them from ccissscsi[] */
555
556         i = 0;
557         nremoved = 0;
558         nadded = 0;
559         while (i < ccissscsi[h->ctlr].ndevices) {
560                 csd = &ccissscsi[h->ctlr].dev[i];
561                 found=0;
562                 for (j=0;j<nsds;j++) {
563                         if (SCSI3ADDR_EQ(sd[j].scsi3addr,
564                                 csd->scsi3addr)) {
565                                 if (device_is_the_same(&sd[j], csd))
566                                         found=2;
567                                 else
568                                         found=1;
569                                 break;
570                         }
571                 }
572
573                 if (found == 0) { /* device no longer present. */ 
574                         changes++;
575                         cciss_scsi_remove_entry(h, hostno, i,
576                                 removed, &nremoved);
577                         /* remove ^^^, hence i not incremented */
578                 } else if (found == 1) { /* device is different in some way */
579                         changes++;
580                         dev_info(&h->pdev->dev,
581                                 "device c%db%dt%dl%d has changed.\n",
582                                 hostno, csd->bus, csd->target, csd->lun);
583                         cciss_scsi_remove_entry(h, hostno, i,
584                                 removed, &nremoved);
585                         /* remove ^^^, hence i not incremented */
586                         if (cciss_scsi_add_entry(h, hostno, &sd[j],
587                                 added, &nadded) != 0)
588                                 /* we just removed one, so add can't fail. */
589                                         BUG();
590                         csd->devtype = sd[j].devtype;
591                         memcpy(csd->device_id, sd[j].device_id,
592                                 sizeof(csd->device_id));
593                         memcpy(csd->vendor, sd[j].vendor,
594                                 sizeof(csd->vendor));
595                         memcpy(csd->model, sd[j].model,
596                                 sizeof(csd->model));
597                         memcpy(csd->revision, sd[j].revision,
598                                 sizeof(csd->revision));
599                 } else          /* device is same as it ever was, */
600                         i++;    /* so just move along. */
601         }
602
603         /* Now, make sure every device listed in sd[] is also
604            listed in ccissscsi[], adding them if they aren't found */
605
606         for (i=0;i<nsds;i++) {
607                 found=0;
608                 for (j = 0; j < ccissscsi[h->ctlr].ndevices; j++) {
609                         csd = &ccissscsi[h->ctlr].dev[j];
610                         if (SCSI3ADDR_EQ(sd[i].scsi3addr,
611                                 csd->scsi3addr)) {
612                                 if (device_is_the_same(&sd[i], csd))
613                                         found=2;        /* found device */
614                                 else
615                                         found=1;        /* found a bug. */
616                                 break;
617                         }
618                 }
619                 if (!found) {
620                         changes++;
621                         if (cciss_scsi_add_entry(h, hostno, &sd[i],
622                                 added, &nadded) != 0)
623                                 break;
624                 } else if (found == 1) {
625                         /* should never happen... */
626                         changes++;
627                         dev_warn(&h->pdev->dev,
628                                 "device unexpectedly changed\n");
629                         /* but if it does happen, we just ignore that device */
630                 }
631         }
632         CPQ_TAPE_UNLOCK(h, flags);
633
634         /* Don't notify scsi mid layer of any changes the first time through */
635         /* (or if there are no changes) scsi_scan_host will do it later the */
636         /* first time through. */
637         if (hostno == -1 || !changes)
638                 goto free_and_out;
639
640         /* Notify scsi mid layer of any removed devices */
641         for (i = 0; i < nremoved; i++) {
642                 struct scsi_device *sdev =
643                         scsi_device_lookup(sh, removed[i].bus,
644                                 removed[i].target, removed[i].lun);
645                 if (sdev != NULL) {
646                         scsi_remove_device(sdev);
647                         scsi_device_put(sdev);
648                 } else {
649                         /* We don't expect to get here. */
650                         /* future cmds to this device will get selection */
651                         /* timeout as if the device was gone. */
652                         dev_warn(&h->pdev->dev, "didn't find "
653                                 "c%db%dt%dl%d\n for removal.",
654                                 hostno, removed[i].bus,
655                                 removed[i].target, removed[i].lun);
656                 }
657         }
658
659         /* Notify scsi mid layer of any added devices */
660         for (i = 0; i < nadded; i++) {
661                 int rc;
662                 rc = scsi_add_device(sh, added[i].bus,
663                         added[i].target, added[i].lun);
664                 if (rc == 0)
665                         continue;
666                 dev_warn(&h->pdev->dev, "scsi_add_device "
667                         "c%db%dt%dl%d failed, device not added.\n",
668                         hostno, added[i].bus, added[i].target, added[i].lun);
669                 /* now we have to remove it from ccissscsi, */
670                 /* since it didn't get added to scsi mid layer */
671                 fixup_botched_add(h, added[i].scsi3addr);
672         }
673
674 free_and_out:
675         kfree(added);
676         kfree(removed);
677         return 0;
678 }
679
680 static int
681 lookup_scsi3addr(ctlr_info_t *h, int bus, int target, int lun, char *scsi3addr)
682 {
683         int i;
684         struct cciss_scsi_dev_t *sd;
685         unsigned long flags;
686
687         CPQ_TAPE_LOCK(h, flags);
688         for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
689                 sd = &ccissscsi[h->ctlr].dev[i];
690                 if (sd->bus == bus &&
691                     sd->target == target &&
692                     sd->lun == lun) {
693                         memcpy(scsi3addr, &sd->scsi3addr[0], 8);
694                         CPQ_TAPE_UNLOCK(h, flags);
695                         return 0;
696                 }
697         }
698         CPQ_TAPE_UNLOCK(h, flags);
699         return -1;
700 }
701
702 static void 
703 cciss_scsi_setup(ctlr_info_t *h)
704 {
705         struct cciss_scsi_adapter_data_t * shba;
706
707         ccissscsi[h->ctlr].ndevices = 0;
708         shba = (struct cciss_scsi_adapter_data_t *)
709                 kmalloc(sizeof(*shba), GFP_KERNEL);     
710         if (shba == NULL)
711                 return;
712         shba->scsi_host = NULL;
713         spin_lock_init(&shba->lock);
714         shba->registered = 0;
715         if (scsi_cmd_stack_setup(h, shba) != 0) {
716                 kfree(shba);
717                 shba = NULL;
718         }
719         h->scsi_ctlr = shba;
720         return;
721 }
722
723 static void complete_scsi_command(CommandList_struct *c, int timeout,
724         __u32 tag)
725 {
726         struct scsi_cmnd *cmd;
727         ctlr_info_t *h;
728         ErrorInfo_struct *ei;
729
730         ei = c->err_info;
731
732         /* First, see if it was a message rather than a command */
733         if (c->Request.Type.Type == TYPE_MSG)  {
734                 c->cmd_type = CMD_MSG_DONE;
735                 return;
736         }
737
738         cmd = (struct scsi_cmnd *) c->scsi_cmd;
739         h = hba[c->ctlr];
740
741         scsi_dma_unmap(cmd);
742         if (c->Header.SGTotal > h->max_cmd_sgentries)
743                 cciss_unmap_sg_chain_block(h, c);
744
745         cmd->result = (DID_OK << 16);           /* host byte */
746         cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
747         /* cmd->result |= (GOOD < 1); */                /* status byte */
748
749         cmd->result |= (ei->ScsiStatus);
750         /* printk("Scsistatus is 0x%02x\n", ei->ScsiStatus);  */
751
752         /* copy the sense data whether we need to or not. */
753
754         memcpy(cmd->sense_buffer, ei->SenseInfo, 
755                 ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
756                         SCSI_SENSE_BUFFERSIZE : 
757                         ei->SenseLen);
758         scsi_set_resid(cmd, ei->ResidualCnt);
759
760         if(ei->CommandStatus != 0) 
761         { /* an error has occurred */ 
762                 switch(ei->CommandStatus)
763                 {
764                         case CMD_TARGET_STATUS:
765                                 /* Pass it up to the upper layers... */
766                                 if( ei->ScsiStatus)
767                                 {
768 #if 0
769                                         printk(KERN_WARNING "cciss: cmd %p "
770                                                 "has SCSI Status = %x\n",
771                                                 c, ei->ScsiStatus);
772 #endif
773                                         cmd->result |= (ei->ScsiStatus << 1);
774                                 }
775                                 else {  /* scsi status is zero??? How??? */
776                                         
777         /* Ordinarily, this case should never happen, but there is a bug
778            in some released firmware revisions that allows it to happen
779            if, for example, a 4100 backplane loses power and the tape
780            drive is in it.  We assume that it's a fatal error of some
781            kind because we can't show that it wasn't. We will make it
782            look like selection timeout since that is the most common
783            reason for this to occur, and it's severe enough. */
784
785                                         cmd->result = DID_NO_CONNECT << 16;
786                                 }
787                         break;
788                         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
789                         break;
790                         case CMD_DATA_OVERRUN:
791                                 dev_warn(&h->pdev->dev, "%p has"
792                                         " completed with data overrun "
793                                         "reported\n", c);
794                         break;
795                         case CMD_INVALID: {
796                                 /* print_bytes(c, sizeof(*c), 1, 0);
797                                 print_cmd(c); */
798      /* We get CMD_INVALID if you address a non-existent tape drive instead
799         of a selection timeout (no response).  You will see this if you yank 
800         out a tape drive, then try to access it. This is kind of a shame
801         because it means that any other CMD_INVALID (e.g. driver bug) will
802         get interpreted as a missing target. */
803                                 cmd->result = DID_NO_CONNECT << 16;
804                                 }
805                         break;
806                         case CMD_PROTOCOL_ERR:
807                                 dev_warn(&h->pdev->dev,
808                                         "%p has protocol error\n", c);
809                         break;
810                         case CMD_HARDWARE_ERR:
811                                 cmd->result = DID_ERROR << 16;
812                                 dev_warn(&h->pdev->dev,
813                                         "%p had hardware error\n", c);
814                         break;
815                         case CMD_CONNECTION_LOST:
816                                 cmd->result = DID_ERROR << 16;
817                                 dev_warn(&h->pdev->dev,
818                                         "%p had connection lost\n", c);
819                         break;
820                         case CMD_ABORTED:
821                                 cmd->result = DID_ABORT << 16;
822                                 dev_warn(&h->pdev->dev, "%p was aborted\n", c);
823                         break;
824                         case CMD_ABORT_FAILED:
825                                 cmd->result = DID_ERROR << 16;
826                                 dev_warn(&h->pdev->dev,
827                                         "%p reports abort failed\n", c);
828                         break;
829                         case CMD_UNSOLICITED_ABORT:
830                                 cmd->result = DID_ABORT << 16;
831                                 dev_warn(&h->pdev->dev, "%p aborted due to an "
832                                         "unsolicited abort\n", c);
833                         break;
834                         case CMD_TIMEOUT:
835                                 cmd->result = DID_TIME_OUT << 16;
836                                 dev_warn(&h->pdev->dev, "%p timedout\n", c);
837                         break;
838                         case CMD_UNABORTABLE:
839                                 cmd->result = DID_ERROR << 16;
840                                 dev_warn(&h->pdev->dev, "c %p command "
841                                         "unabortable\n", c);
842                         break;
843                         default:
844                                 cmd->result = DID_ERROR << 16;
845                                 dev_warn(&h->pdev->dev,
846                                         "%p returned unknown status %x\n", c,
847                                                 ei->CommandStatus); 
848                 }
849         }
850         cmd->scsi_done(cmd);
851         scsi_cmd_free(h, c);
852 }
853
854 static int
855 cciss_scsi_detect(ctlr_info_t *h)
856 {
857         struct Scsi_Host *sh;
858         int error;
859
860         sh = scsi_host_alloc(&cciss_driver_template, sizeof(struct ctlr_info *));
861         if (sh == NULL)
862                 goto fail;
863         sh->io_port = 0;        // good enough?  FIXME, 
864         sh->n_io_port = 0;      // I don't think we use these two...
865         sh->this_id = SELF_SCSI_ID;  
866         sh->can_queue = cciss_tape_cmds;
867         sh->sg_tablesize = h->maxsgentries;
868         sh->max_cmd_len = MAX_COMMAND_SIZE;
869
870         ((struct cciss_scsi_adapter_data_t *) 
871                 h->scsi_ctlr)->scsi_host = sh;
872         sh->hostdata[0] = (unsigned long) h;
873         sh->irq = h->intr[SIMPLE_MODE_INT];
874         sh->unique_id = sh->irq;
875         error = scsi_add_host(sh, &h->pdev->dev);
876         if (error)
877                 goto fail_host_put;
878         scsi_scan_host(sh);
879         return 1;
880
881  fail_host_put:
882         scsi_host_put(sh);
883  fail:
884         return 0;
885 }
886
887 static void
888 cciss_unmap_one(struct pci_dev *pdev,
889                 CommandList_struct *c,
890                 size_t buflen,
891                 int data_direction)
892 {
893         u64bit addr64;
894
895         addr64.val32.lower = c->SG[0].Addr.lower;
896         addr64.val32.upper = c->SG[0].Addr.upper;
897         pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction);
898 }
899
900 static void
901 cciss_map_one(struct pci_dev *pdev,
902                 CommandList_struct *c,
903                 unsigned char *buf,
904                 size_t buflen,
905                 int data_direction)
906 {
907         __u64 addr64;
908
909         addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction);
910         c->SG[0].Addr.lower =
911           (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
912         c->SG[0].Addr.upper =
913           (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
914         c->SG[0].Len = buflen;
915         c->Header.SGList = (__u8) 1;   /* no. SGs contig in this cmd */
916         c->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
917 }
918
919 static int
920 cciss_scsi_do_simple_cmd(ctlr_info_t *h,
921                         CommandList_struct *c,
922                         unsigned char *scsi3addr, 
923                         unsigned char *cdb,
924                         unsigned char cdblen,
925                         unsigned char *buf, int bufsize,
926                         int direction)
927 {
928         DECLARE_COMPLETION_ONSTACK(wait);
929
930         c->cmd_type = CMD_IOCTL_PEND; /* treat this like an ioctl */
931         c->scsi_cmd = NULL;
932         c->Header.ReplyQueue = 0;  /* unused in simple mode */
933         memcpy(&c->Header.LUN, scsi3addr, sizeof(c->Header.LUN));
934         c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
935         // Fill in the request block...
936
937         /* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n", 
938                 scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
939                 scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */
940
941         memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
942         memcpy(c->Request.CDB, cdb, cdblen);
943         c->Request.Timeout = 0;
944         c->Request.CDBLen = cdblen;
945         c->Request.Type.Type = TYPE_CMD;
946         c->Request.Type.Attribute = ATTR_SIMPLE;
947         c->Request.Type.Direction = direction;
948
949         /* Fill in the SG list and do dma mapping */
950         cciss_map_one(h->pdev, c, (unsigned char *) buf,
951                         bufsize, DMA_FROM_DEVICE); 
952
953         c->waiting = &wait;
954         enqueue_cmd_and_start_io(h, c);
955         wait_for_completion(&wait);
956
957         /* undo the dma mapping */
958         cciss_unmap_one(h->pdev, c, bufsize, DMA_FROM_DEVICE);
959         return(0);
960 }
961
962 static void 
963 cciss_scsi_interpret_error(ctlr_info_t *h, CommandList_struct *c)
964 {
965         ErrorInfo_struct *ei;
966
967         ei = c->err_info;
968         switch(ei->CommandStatus)
969         {
970                 case CMD_TARGET_STATUS:
971                         dev_warn(&h->pdev->dev,
972                                 "cmd %p has completed with errors\n", c);
973                         dev_warn(&h->pdev->dev,
974                                 "cmd %p has SCSI Status = %x\n",
975                                 c, ei->ScsiStatus);
976                         if (ei->ScsiStatus == 0)
977                                 dev_warn(&h->pdev->dev,
978                                 "SCSI status is abnormally zero.  "
979                                 "(probably indicates selection timeout "
980                                 "reported incorrectly due to a known "
981                                 "firmware bug, circa July, 2001.)\n");
982                 break;
983                 case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
984                         dev_info(&h->pdev->dev, "UNDERRUN\n");
985                 break;
986                 case CMD_DATA_OVERRUN:
987                         dev_warn(&h->pdev->dev, "%p has"
988                                 " completed with data overrun "
989                                 "reported\n", c);
990                 break;
991                 case CMD_INVALID: {
992                         /* controller unfortunately reports SCSI passthru's */
993                         /* to non-existent targets as invalid commands. */
994                         dev_warn(&h->pdev->dev,
995                                 "%p is reported invalid (probably means "
996                                 "target device no longer present)\n", c);
997                         /* print_bytes((unsigned char *) c, sizeof(*c), 1, 0);
998                         print_cmd(c);  */
999                         }
1000                 break;
1001                 case CMD_PROTOCOL_ERR:
1002                         dev_warn(&h->pdev->dev, "%p has protocol error\n", c);
1003                 break;
1004                 case CMD_HARDWARE_ERR:
1005                         /* cmd->result = DID_ERROR << 16; */
1006                         dev_warn(&h->pdev->dev, "%p had hardware error\n", c);
1007                 break;
1008                 case CMD_CONNECTION_LOST:
1009                         dev_warn(&h->pdev->dev, "%p had connection lost\n", c);
1010                 break;
1011                 case CMD_ABORTED:
1012                         dev_warn(&h->pdev->dev, "%p was aborted\n", c);
1013                 break;
1014                 case CMD_ABORT_FAILED:
1015                         dev_warn(&h->pdev->dev,
1016                                 "%p reports abort failed\n", c);
1017                 break;
1018                 case CMD_UNSOLICITED_ABORT:
1019                         dev_warn(&h->pdev->dev,
1020                                 "%p aborted due to an unsolicited abort\n", c);
1021                 break;
1022                 case CMD_TIMEOUT:
1023                         dev_warn(&h->pdev->dev, "%p timedout\n", c);
1024                 break;
1025                 case CMD_UNABORTABLE:
1026                         dev_warn(&h->pdev->dev,
1027                                 "%p unabortable\n", c);
1028                 break;
1029                 default:
1030                         dev_warn(&h->pdev->dev,
1031                                 "%p returned unknown status %x\n",
1032                                 c, ei->CommandStatus);
1033         }
1034 }
1035
1036 static int
1037 cciss_scsi_do_inquiry(ctlr_info_t *h, unsigned char *scsi3addr,
1038         unsigned char page, unsigned char *buf,
1039         unsigned char bufsize)
1040 {
1041         int rc;
1042         CommandList_struct *c;
1043         char cdb[6];
1044         ErrorInfo_struct *ei;
1045         unsigned long flags;
1046
1047         spin_lock_irqsave(&h->lock, flags);
1048         c = scsi_cmd_alloc(h);
1049         spin_unlock_irqrestore(&h->lock, flags);
1050
1051         if (c == NULL) {                        /* trouble... */
1052                 printk("cmd_alloc returned NULL!\n");
1053                 return -1;
1054         }
1055
1056         ei = c->err_info;
1057
1058         cdb[0] = CISS_INQUIRY;
1059         cdb[1] = (page != 0);
1060         cdb[2] = page;
1061         cdb[3] = 0;
1062         cdb[4] = bufsize;
1063         cdb[5] = 0;
1064         rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr, cdb,
1065                                 6, buf, bufsize, XFER_READ);
1066
1067         if (rc != 0) return rc; /* something went wrong */
1068
1069         if (ei->CommandStatus != 0 && 
1070             ei->CommandStatus != CMD_DATA_UNDERRUN) {
1071                 cciss_scsi_interpret_error(h, c);
1072                 rc = -1;
1073         }
1074         spin_lock_irqsave(&h->lock, flags);
1075         scsi_cmd_free(h, c);
1076         spin_unlock_irqrestore(&h->lock, flags);
1077         return rc;      
1078 }
1079
1080 /* Get the device id from inquiry page 0x83 */
1081 static int cciss_scsi_get_device_id(ctlr_info_t *h, unsigned char *scsi3addr,
1082         unsigned char *device_id, int buflen)
1083 {
1084         int rc;
1085         unsigned char *buf;
1086
1087         if (buflen > 16)
1088                 buflen = 16;
1089         buf = kzalloc(64, GFP_KERNEL);
1090         if (!buf)
1091                 return -1;
1092         rc = cciss_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
1093         if (rc == 0)
1094                 memcpy(device_id, &buf[8], buflen);
1095         kfree(buf);
1096         return rc != 0;
1097 }
1098
1099 static int
1100 cciss_scsi_do_report_phys_luns(ctlr_info_t *h,
1101                 ReportLunData_struct *buf, int bufsize)
1102 {
1103         int rc;
1104         CommandList_struct *c;
1105         unsigned char cdb[12];
1106         unsigned char scsi3addr[8]; 
1107         ErrorInfo_struct *ei;
1108         unsigned long flags;
1109
1110         spin_lock_irqsave(&h->lock, flags);
1111         c = scsi_cmd_alloc(h);
1112         spin_unlock_irqrestore(&h->lock, flags);
1113         if (c == NULL) {                        /* trouble... */
1114                 printk("cmd_alloc returned NULL!\n");
1115                 return -1;
1116         }
1117
1118         memset(&scsi3addr[0], 0, 8); /* address the controller */
1119         cdb[0] = CISS_REPORT_PHYS;
1120         cdb[1] = 0;
1121         cdb[2] = 0;
1122         cdb[3] = 0;
1123         cdb[4] = 0;
1124         cdb[5] = 0;
1125         cdb[6] = (bufsize >> 24) & 0xFF;  //MSB
1126         cdb[7] = (bufsize >> 16) & 0xFF;
1127         cdb[8] = (bufsize >> 8) & 0xFF;
1128         cdb[9] = bufsize & 0xFF;
1129         cdb[10] = 0;
1130         cdb[11] = 0;
1131
1132         rc = cciss_scsi_do_simple_cmd(h, c, scsi3addr,
1133                                 cdb, 12, 
1134                                 (unsigned char *) buf, 
1135                                 bufsize, XFER_READ);
1136
1137         if (rc != 0) return rc; /* something went wrong */
1138
1139         ei = c->err_info;
1140         if (ei->CommandStatus != 0 && 
1141             ei->CommandStatus != CMD_DATA_UNDERRUN) {
1142                 cciss_scsi_interpret_error(h, c);
1143                 rc = -1;
1144         }
1145         spin_lock_irqsave(&h->lock, flags);
1146         scsi_cmd_free(h, c);
1147         spin_unlock_irqrestore(&h->lock, flags);
1148         return rc;      
1149 }
1150
1151 static void
1152 cciss_update_non_disk_devices(ctlr_info_t *h, int hostno)
1153 {
1154         /* the idea here is we could get notified from /proc
1155            that some devices have changed, so we do a report 
1156            physical luns cmd, and adjust our list of devices 
1157            accordingly.  (We can't rely on the scsi-mid layer just
1158            doing inquiries, because the "busses" that the scsi 
1159            mid-layer probes are totally fabricated by this driver,
1160            so new devices wouldn't show up.
1161
1162            the scsi3addr's of devices won't change so long as the 
1163            adapter is not reset.  That means we can rescan and 
1164            tell which devices we already know about, vs. new 
1165            devices, vs.  disappearing devices.
1166
1167            Also, if you yank out a tape drive, then put in a disk
1168            in it's place, (say, a configured volume from another 
1169            array controller for instance)  _don't_ poke this driver 
1170            (so it thinks it's still a tape, but _do_ poke the scsi 
1171            mid layer, so it does an inquiry... the scsi mid layer 
1172            will see the physical disk.  This would be bad.  Need to
1173            think about how to prevent that.  One idea would be to 
1174            snoop all scsi responses and if an inquiry repsonse comes
1175            back that reports a disk, chuck it an return selection
1176            timeout instead and adjust our table...  Not sure i like
1177            that though.  
1178
1179          */
1180 #define OBDR_TAPE_INQ_SIZE 49
1181 #define OBDR_TAPE_SIG "$DR-10"
1182         ReportLunData_struct *ld_buff;
1183         unsigned char *inq_buff;
1184         unsigned char scsi3addr[8];
1185         __u32 num_luns=0;
1186         unsigned char *ch;
1187         struct cciss_scsi_dev_t *currentsd, *this_device;
1188         int ncurrent=0;
1189         int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
1190         int i;
1191
1192         ld_buff = kzalloc(reportlunsize, GFP_KERNEL);
1193         inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1194         currentsd = kzalloc(sizeof(*currentsd) *
1195                         (CCISS_MAX_SCSI_DEVS_PER_HBA+1), GFP_KERNEL);
1196         if (ld_buff == NULL || inq_buff == NULL || currentsd == NULL) {
1197                 printk(KERN_ERR "cciss: out of memory\n");
1198                 goto out;
1199         }
1200         this_device = &currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
1201         if (cciss_scsi_do_report_phys_luns(h, ld_buff, reportlunsize) == 0) {
1202                 ch = &ld_buff->LUNListLength[0];
1203                 num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
1204                 if (num_luns > CISS_MAX_PHYS_LUN) {
1205                         printk(KERN_WARNING 
1206                                 "cciss: Maximum physical LUNs (%d) exceeded.  "
1207                                 "%d LUNs ignored.\n", CISS_MAX_PHYS_LUN, 
1208                                 num_luns - CISS_MAX_PHYS_LUN);
1209                         num_luns = CISS_MAX_PHYS_LUN;
1210                 }
1211         }
1212         else {
1213                 printk(KERN_ERR  "cciss: Report physical LUNs failed.\n");
1214                 goto out;
1215         }
1216
1217
1218         /* adjust our table of devices */       
1219         for (i = 0; i < num_luns; i++) {
1220                 /* for each physical lun, do an inquiry */
1221                 if (ld_buff->LUN[i][3] & 0xC0) continue;
1222                 memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
1223                 memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
1224
1225                 if (cciss_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
1226                         (unsigned char) OBDR_TAPE_INQ_SIZE) != 0)
1227                         /* Inquiry failed (msg printed already) */
1228                         continue; /* so we will skip this device. */
1229
1230                 this_device->devtype = (inq_buff[0] & 0x1f);
1231                 this_device->bus = -1;
1232                 this_device->target = -1;
1233                 this_device->lun = -1;
1234                 memcpy(this_device->scsi3addr, scsi3addr, 8);
1235                 memcpy(this_device->vendor, &inq_buff[8],
1236                         sizeof(this_device->vendor));
1237                 memcpy(this_device->model, &inq_buff[16],
1238                         sizeof(this_device->model));
1239                 memcpy(this_device->revision, &inq_buff[32],
1240                         sizeof(this_device->revision));
1241                 memset(this_device->device_id, 0,
1242                         sizeof(this_device->device_id));
1243                 cciss_scsi_get_device_id(h, scsi3addr,
1244                         this_device->device_id, sizeof(this_device->device_id));
1245
1246                 switch (this_device->devtype)
1247                 {
1248                   case 0x05: /* CD-ROM */ {
1249
1250                         /* We don't *really* support actual CD-ROM devices,
1251                          * just this "One Button Disaster Recovery" tape drive
1252                          * which temporarily pretends to be a CD-ROM drive.
1253                          * So we check that the device is really an OBDR tape
1254                          * device by checking for "$DR-10" in bytes 43-48 of
1255                          * the inquiry data.
1256                          */
1257                                 char obdr_sig[7];
1258
1259                                 strncpy(obdr_sig, &inq_buff[43], 6);
1260                                 obdr_sig[6] = '\0';
1261                                 if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
1262                                         /* Not OBDR device, ignore it. */
1263                                         break;
1264                         }
1265                         /* fall through . . . */
1266                   case 0x01: /* sequential access, (tape) */
1267                   case 0x08: /* medium changer */
1268                         if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
1269                                 printk(KERN_INFO "cciss%d: %s ignored, "
1270                                         "too many devices.\n", h->ctlr,
1271                                         scsi_device_type(this_device->devtype));
1272                                 break;
1273                         }
1274                         currentsd[ncurrent] = *this_device;
1275                         ncurrent++;
1276                         break;
1277                   default: 
1278                         break;
1279                 }
1280         }
1281
1282         adjust_cciss_scsi_table(h, hostno, currentsd, ncurrent);
1283 out:
1284         kfree(inq_buff);
1285         kfree(ld_buff);
1286         kfree(currentsd);
1287         return;
1288 }
1289
1290 static int
1291 is_keyword(char *ptr, int len, char *verb)  // Thanks to ncr53c8xx.c
1292 {
1293         int verb_len = strlen(verb);
1294         if (len >= verb_len && !memcmp(verb,ptr,verb_len))
1295                 return verb_len;
1296         else
1297                 return 0;
1298 }
1299
1300 static int
1301 cciss_scsi_user_command(ctlr_info_t *h, int hostno, char *buffer, int length)
1302 {
1303         int arg_len;
1304
1305         if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
1306                 cciss_update_non_disk_devices(h, hostno);
1307         else
1308                 return -EINVAL;
1309         return length;
1310 }
1311
1312
1313 static int
1314 cciss_scsi_proc_info(struct Scsi_Host *sh,
1315                 char *buffer, /* data buffer */
1316                 char **start,      /* where data in buffer starts */
1317                 off_t offset,      /* offset from start of imaginary file */
1318                 int length,        /* length of data in buffer */
1319                 int func)          /* 0 == read, 1 == write */
1320 {
1321
1322         int buflen, datalen;
1323         ctlr_info_t *h;
1324         int i;
1325
1326         h = (ctlr_info_t *) sh->hostdata[0];
1327         if (h == NULL)  /* This really shouldn't ever happen. */
1328                 return -EINVAL;
1329
1330         if (func == 0) {        /* User is reading from /proc/scsi/ciss*?/?*  */
1331                 buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
1332                                 h->ctlr, sh->host_no);
1333
1334                 /* this information is needed by apps to know which cciss
1335                    device corresponds to which scsi host number without
1336                    having to open a scsi target device node.  The device
1337                    information is not a duplicate of /proc/scsi/scsi because
1338                    the two may be out of sync due to scsi hotplug, rather
1339                    this info is for an app to be able to use to know how to
1340                    get them back in sync. */
1341
1342                 for (i = 0; i < ccissscsi[h->ctlr].ndevices; i++) {
1343                         struct cciss_scsi_dev_t *sd =
1344                                 &ccissscsi[h->ctlr].dev[i];
1345                         buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d "
1346                                 "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
1347                                 sh->host_no, sd->bus, sd->target, sd->lun,
1348                                 sd->devtype,
1349                                 sd->scsi3addr[0], sd->scsi3addr[1],
1350                                 sd->scsi3addr[2], sd->scsi3addr[3],
1351                                 sd->scsi3addr[4], sd->scsi3addr[5],
1352                                 sd->scsi3addr[6], sd->scsi3addr[7]);
1353                 }
1354                 datalen = buflen - offset;
1355                 if (datalen < 0) {      /* they're reading past EOF. */
1356                         datalen = 0;
1357                         *start = buffer+buflen; 
1358                 } else
1359                         *start = buffer + offset;
1360                 return(datalen);
1361         } else  /* User is writing to /proc/scsi/cciss*?/?*  ... */
1362                 return cciss_scsi_user_command(h, sh->host_no,
1363                         buffer, length);        
1364
1365
1366 /* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci 
1367    dma mapping  and fills in the scatter gather entries of the 
1368    cciss command, c. */
1369
1370 static void cciss_scatter_gather(ctlr_info_t *h, CommandList_struct *c,
1371         struct scsi_cmnd *cmd)
1372 {
1373         unsigned int len;
1374         struct scatterlist *sg;
1375         __u64 addr64;
1376         int request_nsgs, i, chained, sg_index;
1377         struct cciss_scsi_adapter_data_t *sa = h->scsi_ctlr;
1378         SGDescriptor_struct *curr_sg;
1379
1380         BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);
1381
1382         chained = 0;
1383         sg_index = 0;
1384         curr_sg = c->SG;
1385         request_nsgs = scsi_dma_map(cmd);
1386         if (request_nsgs) {
1387                 scsi_for_each_sg(cmd, sg, request_nsgs, i) {
1388                         if (sg_index + 1 == h->max_cmd_sgentries &&
1389                                 !chained && request_nsgs - i > 1) {
1390                                 chained = 1;
1391                                 sg_index = 0;
1392                                 curr_sg = sa->cmd_sg_list[c->cmdindex];
1393                         }
1394                         addr64 = (__u64) sg_dma_address(sg);
1395                         len  = sg_dma_len(sg);
1396                         curr_sg[sg_index].Addr.lower =
1397                                 (__u32) (addr64 & 0x0FFFFFFFFULL);
1398                         curr_sg[sg_index].Addr.upper =
1399                                 (__u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
1400                         curr_sg[sg_index].Len = len;
1401                         curr_sg[sg_index].Ext = 0;
1402                         ++sg_index;
1403                 }
1404                 if (chained)
1405                         cciss_map_sg_chain_block(h, c,
1406                                 sa->cmd_sg_list[c->cmdindex],
1407                                 (request_nsgs - (h->max_cmd_sgentries - 1)) *
1408                                         sizeof(SGDescriptor_struct));
1409         }
1410         /* track how many SG entries we are using */
1411         if (request_nsgs > h->maxSG)
1412                 h->maxSG = request_nsgs;
1413         c->Header.SGTotal = (__u8) request_nsgs + chained;
1414         if (request_nsgs > h->max_cmd_sgentries)
1415                 c->Header.SGList = h->max_cmd_sgentries;
1416         else
1417                 c->Header.SGList = c->Header.SGTotal;
1418         return;
1419 }
1420
1421
1422 static int
1423 cciss_scsi_queue_command_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
1424 {
1425         ctlr_info_t *h;
1426         int rc;
1427         unsigned char scsi3addr[8];
1428         CommandList_struct *c;
1429         unsigned long flags;
1430
1431         // Get the ptr to our adapter structure (hba[i]) out of cmd->host.
1432         // We violate cmd->host privacy here.  (Is there another way?)
1433         h = (ctlr_info_t *) cmd->device->host->hostdata[0];
1434
1435         rc = lookup_scsi3addr(h, cmd->device->channel, cmd->device->id,
1436                         cmd->device->lun, scsi3addr);
1437         if (rc != 0) {
1438                 /* the scsi nexus does not match any that we presented... */
1439                 /* pretend to mid layer that we got selection timeout */
1440                 cmd->result = DID_NO_CONNECT << 16;
1441                 done(cmd);
1442                 /* we might want to think about registering controller itself
1443                    as a processor device on the bus so sg binds to it. */
1444                 return 0;
1445         }
1446
1447         /* Ok, we have a reasonable scsi nexus, so send the cmd down, and
1448            see what the device thinks of it. */
1449
1450         spin_lock_irqsave(&h->lock, flags);
1451         c = scsi_cmd_alloc(h);
1452         spin_unlock_irqrestore(&h->lock, flags);
1453         if (c == NULL) {                        /* trouble... */
1454                 dev_warn(&h->pdev->dev, "scsi_cmd_alloc returned NULL!\n");
1455                 /* FIXME: next 3 lines are -> BAD! <- */
1456                 cmd->result = DID_NO_CONNECT << 16;
1457                 done(cmd);
1458                 return 0;
1459         }
1460
1461         // Fill in the command list header
1462
1463         cmd->scsi_done = done;    // save this for use by completion code 
1464
1465         /* save c in case we have to abort it */
1466         cmd->host_scribble = (unsigned char *) c;
1467
1468         c->cmd_type = CMD_SCSI;
1469         c->scsi_cmd = cmd;
1470         c->Header.ReplyQueue = 0;  /* unused in simple mode */
1471         memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
1472         c->Header.Tag.lower = c->busaddr;  /* Use k. address of cmd as tag */
1473         
1474         // Fill in the request block...
1475
1476         c->Request.Timeout = 0;
1477         memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
1478         BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
1479         c->Request.CDBLen = cmd->cmd_len;
1480         memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
1481         c->Request.Type.Type = TYPE_CMD;
1482         c->Request.Type.Attribute = ATTR_SIMPLE;
1483         switch(cmd->sc_data_direction)
1484         {
1485           case DMA_TO_DEVICE:
1486                 c->Request.Type.Direction = XFER_WRITE;
1487                 break;
1488           case DMA_FROM_DEVICE:
1489                 c->Request.Type.Direction = XFER_READ;
1490                 break;
1491           case DMA_NONE:
1492                 c->Request.Type.Direction = XFER_NONE;
1493                 break;
1494           case DMA_BIDIRECTIONAL:
1495                 // This can happen if a buggy application does a scsi passthru
1496                 // and sets both inlen and outlen to non-zero. ( see
1497                 // ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
1498
1499                 c->Request.Type.Direction = XFER_RSVD;
1500                 // This is technically wrong, and cciss controllers should
1501                 // reject it with CMD_INVALID, which is the most correct 
1502                 // response, but non-fibre backends appear to let it 
1503                 // slide by, and give the same results as if this field
1504                 // were set correctly.  Either way is acceptable for
1505                 // our purposes here.
1506
1507                 break;
1508
1509           default: 
1510                 dev_warn(&h->pdev->dev, "unknown data direction: %d\n",
1511                         cmd->sc_data_direction);
1512                 BUG();
1513                 break;
1514         }
1515         cciss_scatter_gather(h, c, cmd);
1516         enqueue_cmd_and_start_io(h, c);
1517         /* the cmd'll come back via intr handler in complete_scsi_command()  */
1518         return 0;
1519 }
1520
1521 static DEF_SCSI_QCMD(cciss_scsi_queue_command)
1522
1523 static void cciss_unregister_scsi(ctlr_info_t *h)
1524 {
1525         struct cciss_scsi_adapter_data_t *sa;
1526         struct cciss_scsi_cmd_stack_t *stk;
1527         unsigned long flags;
1528
1529         /* we are being forcibly unloaded, and may not refuse. */
1530
1531         spin_lock_irqsave(&h->lock, flags);
1532         sa = h->scsi_ctlr;
1533         stk = &sa->cmd_stack; 
1534
1535         /* if we weren't ever actually registered, don't unregister */ 
1536         if (sa->registered) {
1537                 spin_unlock_irqrestore(&h->lock, flags);
1538                 scsi_remove_host(sa->scsi_host);
1539                 scsi_host_put(sa->scsi_host);
1540                 spin_lock_irqsave(&h->lock, flags);
1541         }
1542
1543         /* set scsi_host to NULL so our detect routine will 
1544            find us on register */
1545         sa->scsi_host = NULL;
1546         spin_unlock_irqrestore(&h->lock, flags);
1547         scsi_cmd_stack_free(h);
1548         kfree(sa);
1549 }
1550
1551 static int cciss_engage_scsi(ctlr_info_t *h)
1552 {
1553         struct cciss_scsi_adapter_data_t *sa;
1554         struct cciss_scsi_cmd_stack_t *stk;
1555         unsigned long flags;
1556
1557         spin_lock_irqsave(&h->lock, flags);
1558         sa = h->scsi_ctlr;
1559         stk = &sa->cmd_stack; 
1560
1561         if (sa->registered) {
1562                 dev_info(&h->pdev->dev, "SCSI subsystem already engaged.\n");
1563                 spin_unlock_irqrestore(&h->lock, flags);
1564                 return -ENXIO;
1565         }
1566         sa->registered = 1;
1567         spin_unlock_irqrestore(&h->lock, flags);
1568         cciss_update_non_disk_devices(h, -1);
1569         cciss_scsi_detect(h);
1570         return 0;
1571 }
1572
1573 static void
1574 cciss_seq_tape_report(struct seq_file *seq, ctlr_info_t *h)
1575 {
1576         unsigned long flags;
1577
1578         CPQ_TAPE_LOCK(h, flags);
1579         seq_printf(seq,
1580                 "Sequential access devices: %d\n\n",
1581                         ccissscsi[h->ctlr].ndevices);
1582         CPQ_TAPE_UNLOCK(h, flags);
1583 }
1584
1585 static int wait_for_device_to_become_ready(ctlr_info_t *h,
1586         unsigned char lunaddr[])
1587 {
1588         int rc;
1589         int count = 0;
1590         int waittime = HZ;
1591         CommandList_struct *c;
1592
1593         c = cmd_alloc(h);
1594         if (!c) {
1595                 dev_warn(&h->pdev->dev, "out of memory in "
1596                         "wait_for_device_to_become_ready.\n");
1597                 return IO_ERROR;
1598         }
1599
1600         /* Send test unit ready until device ready, or give up. */
1601         while (count < 20) {
1602
1603                 /* Wait for a bit.  do this first, because if we send
1604                  * the TUR right away, the reset will just abort it.
1605                  */
1606                 schedule_timeout_uninterruptible(waittime);
1607                 count++;
1608
1609                 /* Increase wait time with each try, up to a point. */
1610                 if (waittime < (HZ * 30))
1611                         waittime = waittime * 2;
1612
1613                 /* Send the Test Unit Ready */
1614                 rc = fill_cmd(h, c, TEST_UNIT_READY, NULL, 0, 0,
1615                         lunaddr, TYPE_CMD);
1616                 if (rc == 0)
1617                         rc = sendcmd_withirq_core(h, c, 0);
1618
1619                 (void) process_sendcmd_error(h, c);
1620
1621                 if (rc != 0)
1622                         goto retry_tur;
1623
1624                 if (c->err_info->CommandStatus == CMD_SUCCESS)
1625                         break;
1626
1627                 if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
1628                         c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
1629                         if (c->err_info->SenseInfo[2] == NO_SENSE)
1630                                 break;
1631                         if (c->err_info->SenseInfo[2] == UNIT_ATTENTION) {
1632                                 unsigned char asc;
1633                                 asc = c->err_info->SenseInfo[12];
1634                                 check_for_unit_attention(h, c);
1635                                 if (asc == POWER_OR_RESET)
1636                                         break;
1637                         }
1638                 }
1639 retry_tur:
1640                 dev_warn(&h->pdev->dev, "Waiting %d secs "
1641                         "for device to become ready.\n",
1642                         waittime / HZ);
1643                 rc = 1; /* device not ready. */
1644         }
1645
1646         if (rc)
1647                 dev_warn(&h->pdev->dev, "giving up on device.\n");
1648         else
1649                 dev_warn(&h->pdev->dev, "device is ready.\n");
1650
1651         cmd_free(h, c);
1652         return rc;
1653 }
1654
1655 /* Need at least one of these error handlers to keep ../scsi/hosts.c from 
1656  * complaining.  Doing a host- or bus-reset can't do anything good here. 
1657  * Despite what it might say in scsi_error.c, there may well be commands
1658  * on the controller, as the cciss driver registers twice, once as a block
1659  * device for the logical drives, and once as a scsi device, for any tape
1660  * drives.  So we know there are no commands out on the tape drives, but we
1661  * don't know there are no commands on the controller, and it is likely 
1662  * that there probably are, as the cciss block device is most commonly used
1663  * as a boot device (embedded controller on HP/Compaq systems.)
1664 */
1665
1666 static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
1667 {
1668         int rc;
1669         CommandList_struct *cmd_in_trouble;
1670         unsigned char lunaddr[8];
1671         ctlr_info_t *h;
1672
1673         /* find the controller to which the command to be aborted was sent */
1674         h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
1675         if (h == NULL) /* paranoia */
1676                 return FAILED;
1677         dev_warn(&h->pdev->dev, "resetting tape drive or medium changer.\n");
1678         /* find the command that's giving us trouble */
1679         cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
1680         if (cmd_in_trouble == NULL) /* paranoia */
1681                 return FAILED;
1682         memcpy(lunaddr, &cmd_in_trouble->Header.LUN.LunAddrBytes[0], 8);
1683         /* send a reset to the SCSI LUN which the command was sent to */
1684         rc = sendcmd_withirq(h, CCISS_RESET_MSG, NULL, 0, 0, lunaddr,
1685                 TYPE_MSG);
1686         if (rc == 0 && wait_for_device_to_become_ready(h, lunaddr) == 0)
1687                 return SUCCESS;
1688         dev_warn(&h->pdev->dev, "resetting device failed.\n");
1689         return FAILED;
1690 }
1691
1692 static int  cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
1693 {
1694         int rc;
1695         CommandList_struct *cmd_to_abort;
1696         unsigned char lunaddr[8];
1697         ctlr_info_t *h;
1698
1699         /* find the controller to which the command to be aborted was sent */
1700         h = (ctlr_info_t *) scsicmd->device->host->hostdata[0];
1701         if (h == NULL) /* paranoia */
1702                 return FAILED;
1703         dev_warn(&h->pdev->dev, "aborting tardy SCSI cmd\n");
1704
1705         /* find the command to be aborted */
1706         cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
1707         if (cmd_to_abort == NULL) /* paranoia */
1708                 return FAILED;
1709         memcpy(lunaddr, &cmd_to_abort->Header.LUN.LunAddrBytes[0], 8);
1710         rc = sendcmd_withirq(h, CCISS_ABORT_MSG, &cmd_to_abort->Header.Tag,
1711                 0, 0, lunaddr, TYPE_MSG);
1712         if (rc == 0)
1713                 return SUCCESS;
1714         return FAILED;
1715
1716 }
1717
1718 #else /* no CONFIG_CISS_SCSI_TAPE */
1719
1720 /* If no tape support, then these become defined out of existence */
1721
1722 #define cciss_scsi_setup(cntl_num)
1723
1724 #endif /* CONFIG_CISS_SCSI_TAPE */