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[PATCH] update max_sectors documentation
[linux-2.6-block.git] / drivers / block / cciss_scsi.c
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1da177e4
LT		 1/*
2 * Disk Array driver for Compaq SA53xx Controllers, SCSI Tape module
3 * Copyright 2001 Compaq Computer Corporation
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; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
13 * NON INFRINGEMENT. See the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, 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
4e57b681
TS		 31#include <linux/timer.h>
32#include <linux/completion.h>
33#include <linux/slab.h>
34#include <linux/string.h>
35
36#include <asm/atomic.h>
37
1da177e4
LT		 38#include <scsi/scsi.h>
39#include <scsi/scsi_cmnd.h>
40#include <scsi/scsi_device.h>
41#include <scsi/scsi_host.h>
1da177e4
LT		 42
43#include "cciss_scsi.h"
44
3da8b713 45#define CCISS_ABORT_MSG 0x00
46#define CCISS_RESET_MSG 0x01
47
1da177e4
LT		 48/* some prototypes... */
49static int sendcmd(
50 __u8 cmd,
51 int ctlr,
52 void *buff,
53 size_t size,
54 unsigned int use_unit_num, /* 0: address the controller,
55 1: address logical volume log_unit,
56 2: address is in scsi3addr */
57 unsigned int log_unit,
58 __u8 page_code,
59 unsigned char *scsi3addr,
60 int cmd_type);
61
62
63static int cciss_scsi_proc_info(
64 struct Scsi_Host *sh,
65 char *buffer, /* data buffer */
66 char **start, /* where data in buffer starts */
67 off_t offset, /* offset from start of imaginary file */
68 int length, /* length of data in buffer */
69 int func); /* 0 == read, 1 == write */
70
71static int cciss_scsi_queue_command (struct scsi_cmnd *cmd,
72 void (* done)(struct scsi_cmnd *));
3da8b713 73static int cciss_eh_device_reset_handler(struct scsi_cmnd *);
74static int cciss_eh_abort_handler(struct scsi_cmnd *);
1da177e4
LT		 75
76static struct cciss_scsi_hba_t ccissscsi[MAX_CTLR] = {
77 { .name = "cciss0", .ndevices = 0 },
78 { .name = "cciss1", .ndevices = 0 },
79 { .name = "cciss2", .ndevices = 0 },
80 { .name = "cciss3", .ndevices = 0 },
81 { .name = "cciss4", .ndevices = 0 },
82 { .name = "cciss5", .ndevices = 0 },
83 { .name = "cciss6", .ndevices = 0 },
84 { .name = "cciss7", .ndevices = 0 },
85};
86
87static struct scsi_host_template cciss_driver_template = {
88 .module = THIS_MODULE,
89 .name = "cciss",
90 .proc_name = "cciss",
91 .proc_info = cciss_scsi_proc_info,
92 .queuecommand = cciss_scsi_queue_command,
93 .can_queue = SCSI_CCISS_CAN_QUEUE,
94 .this_id = 7,
95 .sg_tablesize = MAXSGENTRIES,
96 .cmd_per_lun = 1,
97 .use_clustering = DISABLE_CLUSTERING,
3da8b713 98 /* Can't have eh_bus_reset_handler or eh_host_reset_handler for cciss */
99 .eh_device_reset_handler= cciss_eh_device_reset_handler,
100 .eh_abort_handler = cciss_eh_abort_handler,
1da177e4
LT		 101};
102
103#pragma pack(1)
104struct cciss_scsi_cmd_stack_elem_t {
105 CommandList_struct cmd;
106 ErrorInfo_struct Err;
107 __u32 busaddr;
33079b21 108 __u32 pad;
1da177e4
LT		 109};
110
111#pragma pack()
112
113#define CMD_STACK_SIZE (SCSI_CCISS_CAN_QUEUE * \
114 CCISS_MAX_SCSI_DEVS_PER_HBA + 2)
115 // plus two for init time usage
116
117#pragma pack(1)
118struct cciss_scsi_cmd_stack_t {
119 struct cciss_scsi_cmd_stack_elem_t *pool;
120 struct cciss_scsi_cmd_stack_elem_t *elem[CMD_STACK_SIZE];
121 dma_addr_t cmd_pool_handle;
122 int top;
123};
124#pragma pack()
125
126struct cciss_scsi_adapter_data_t {
127 struct Scsi_Host *scsi_host;
128 struct cciss_scsi_cmd_stack_t cmd_stack;
129 int registered;
130 spinlock_t lock; // to protect ccissscsi[ctlr];
131};
132
133#define CPQ_TAPE_LOCK(ctlr, flags) spin_lock_irqsave( \
134 &(((struct cciss_scsi_adapter_data_t *) \
135 hba[ctlr]->scsi_ctlr)->lock), flags);
136#define CPQ_TAPE_UNLOCK(ctlr, flags) spin_unlock_irqrestore( \
137 &(((struct cciss_scsi_adapter_data_t *) \
138 hba[ctlr]->scsi_ctlr)->lock), flags);
139
140static CommandList_struct *
141scsi_cmd_alloc(ctlr_info_t *h)
142{
143 /* assume only one process in here at a time, locking done by caller. */
144 /* use CCISS_LOCK(ctlr) */
145 /* might be better to rewrite how we allocate scsi commands in a way that */
146 /* needs no locking at all. */
147
148 /* take the top memory chunk off the stack and return it, if any. */
149 struct cciss_scsi_cmd_stack_elem_t *c;
150 struct cciss_scsi_adapter_data_t *sa;
151 struct cciss_scsi_cmd_stack_t *stk;
152 u64bit temp64;
153
154 sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr;
155 stk = &sa->cmd_stack;
156
157 if (stk->top < 0)
158 return NULL;
159 c = stk->elem[stk->top];
160 /* memset(c, 0, sizeof(*c)); */
161 memset(&c->cmd, 0, sizeof(c->cmd));
162 memset(&c->Err, 0, sizeof(c->Err));
163 /* set physical addr of cmd and addr of scsi parameters */
164 c->cmd.busaddr = c->busaddr;
165 /* (__u32) (stk->cmd_pool_handle +
166 (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top)); */
167
168 temp64.val = (__u64) (c->busaddr + sizeof(CommandList_struct));
169 /* (__u64) (stk->cmd_pool_handle +
170 (sizeof(struct cciss_scsi_cmd_stack_elem_t)*stk->top) +
171 sizeof(CommandList_struct)); */
172 stk->top--;
173 c->cmd.ErrDesc.Addr.lower = temp64.val32.lower;
174 c->cmd.ErrDesc.Addr.upper = temp64.val32.upper;
175 c->cmd.ErrDesc.Len = sizeof(ErrorInfo_struct);
176
177 c->cmd.ctlr = h->ctlr;
178 c->cmd.err_info = &c->Err;
179
180 return (CommandList_struct *) c;
181}
182
183static void
184scsi_cmd_free(ctlr_info_t *h, CommandList_struct *cmd)
185{
186 /* assume only one process in here at a time, locking done by caller. */
187 /* use CCISS_LOCK(ctlr) */
188 /* drop the free memory chunk on top of the stack. */
189
190 struct cciss_scsi_adapter_data_t *sa;
191 struct cciss_scsi_cmd_stack_t *stk;
192
193 sa = (struct cciss_scsi_adapter_data_t *) h->scsi_ctlr;
194 stk = &sa->cmd_stack;
195 if (stk->top >= CMD_STACK_SIZE) {
196 printk("cciss: scsi_cmd_free called too many times.\n");
197 BUG();
198 }
199 stk->top++;
200 stk->elem[stk->top] = (struct cciss_scsi_cmd_stack_elem_t *) cmd;
201}
202
203static int
204scsi_cmd_stack_setup(int ctlr, struct cciss_scsi_adapter_data_t *sa)
205{
206 int i;
207 struct cciss_scsi_cmd_stack_t *stk;
208 size_t size;
209
210 stk = &sa->cmd_stack;
211 size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE;
212
213 // pci_alloc_consistent guarantees 32-bit DMA address will
214 // be used
215
216 stk->pool = (struct cciss_scsi_cmd_stack_elem_t *)
217 pci_alloc_consistent(hba[ctlr]->pdev, size, &stk->cmd_pool_handle);
218
219 if (stk->pool == NULL) {
220 printk("stk->pool is null\n");
221 return -1;
222 }
223
224 for (i=0; i<CMD_STACK_SIZE; i++) {
225 stk->elem[i] = &stk->pool[i];
226 stk->elem[i]->busaddr = (__u32) (stk->cmd_pool_handle +
227 (sizeof(struct cciss_scsi_cmd_stack_elem_t) * i));
228 }
229 stk->top = CMD_STACK_SIZE-1;
230 return 0;
231}
232
233static void
234scsi_cmd_stack_free(int ctlr)
235{
236 struct cciss_scsi_adapter_data_t *sa;
237 struct cciss_scsi_cmd_stack_t *stk;
238 size_t size;
239
240 sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
241 stk = &sa->cmd_stack;
242 if (stk->top != CMD_STACK_SIZE-1) {
243 printk( "cciss: %d scsi commands are still outstanding.\n",
244 CMD_STACK_SIZE - stk->top);
245 // BUG();
246 printk("WE HAVE A BUG HERE!!! stk=0x%p\n", stk);
247 }
248 size = sizeof(struct cciss_scsi_cmd_stack_elem_t) * CMD_STACK_SIZE;
249
250 pci_free_consistent(hba[ctlr]->pdev, size, stk->pool, stk->cmd_pool_handle);
251 stk->pool = NULL;
252}
253
254/* scsi_device_types comes from scsi.h */
255#define DEVICETYPE(n) (n<0 || n>MAX_SCSI_DEVICE_CODE) ? \
256 "Unknown" : scsi_device_types[n]
257
400bb236 258#if 0
1da177e4
LT		 259static int xmargin=8;
260static int amargin=60;
261
262static void
263print_bytes (unsigned char *c, int len, int hex, int ascii)
264{
265
266 int i;
267 unsigned char *x;
268
269 if (hex)
270 {
271 x = c;
272 for (i=0;i<len;i++)
273 {
274 if ((i % xmargin) == 0 && i>0) printk("\n");
275 if ((i % xmargin) == 0) printk("0x%04x:", i);
276 printk(" %02x", *x);
277 x++;
278 }
279 printk("\n");
280 }
281 if (ascii)
282 {
283 x = c;
284 for (i=0;i<len;i++)
285 {
286 if ((i % amargin) == 0 && i>0) printk("\n");
287 if ((i % amargin) == 0) printk("0x%04x:", i);
288 if (*x > 26 && *x < 128) printk("%c", *x);
289 else printk(".");
290 x++;
291 }
292 printk("\n");
293 }
294}
295
296static void
297print_cmd(CommandList_struct *cp)
298{
299 printk("queue:%d\n", cp->Header.ReplyQueue);
300 printk("sglist:%d\n", cp->Header.SGList);
301 printk("sgtot:%d\n", cp->Header.SGTotal);
302 printk("Tag:0x%08x/0x%08x\n", cp->Header.Tag.upper,
303 cp->Header.Tag.lower);
304 printk("LUN:0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
305 cp->Header.LUN.LunAddrBytes[0],
306 cp->Header.LUN.LunAddrBytes[1],
307 cp->Header.LUN.LunAddrBytes[2],
308 cp->Header.LUN.LunAddrBytes[3],
309 cp->Header.LUN.LunAddrBytes[4],
310 cp->Header.LUN.LunAddrBytes[5],
311 cp->Header.LUN.LunAddrBytes[6],
312 cp->Header.LUN.LunAddrBytes[7]);
313 printk("CDBLen:%d\n", cp->Request.CDBLen);
314 printk("Type:%d\n",cp->Request.Type.Type);
315 printk("Attr:%d\n",cp->Request.Type.Attribute);
316 printk(" Dir:%d\n",cp->Request.Type.Direction);
317 printk("Timeout:%d\n",cp->Request.Timeout);
318 printk( "CDB: %02x %02x %02x %02x %02x %02x %02x %02x"
319 " %02x %02x %02x %02x %02x %02x %02x %02x\n",
320 cp->Request.CDB[0], cp->Request.CDB[1],
321 cp->Request.CDB[2], cp->Request.CDB[3],
322 cp->Request.CDB[4], cp->Request.CDB[5],
323 cp->Request.CDB[6], cp->Request.CDB[7],
324 cp->Request.CDB[8], cp->Request.CDB[9],
325 cp->Request.CDB[10], cp->Request.CDB[11],
326 cp->Request.CDB[12], cp->Request.CDB[13],
327 cp->Request.CDB[14], cp->Request.CDB[15]),
328 printk("edesc.Addr: 0x%08x/0%08x, Len = %d\n",
329 cp->ErrDesc.Addr.upper, cp->ErrDesc.Addr.lower,
330 cp->ErrDesc.Len);
331 printk("sgs..........Errorinfo:\n");
332 printk("scsistatus:%d\n", cp->err_info->ScsiStatus);
333 printk("senselen:%d\n", cp->err_info->SenseLen);
334 printk("cmd status:%d\n", cp->err_info->CommandStatus);
335 printk("resid cnt:%d\n", cp->err_info->ResidualCnt);
336 printk("offense size:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_size);
337 printk("offense byte:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_num);
338 printk("offense value:%d\n", cp->err_info->MoreErrInfo.Invalid_Cmd.offense_value);
339
340}
341
342#endif
343
344static int
345find_bus_target_lun(int ctlr, int *bus, int *target, int *lun)
346{
347 /* finds an unused bus, target, lun for a new device */
348 /* assumes hba[ctlr]->scsi_ctlr->lock is held */
349 int i, found=0;
350 unsigned char target_taken[CCISS_MAX_SCSI_DEVS_PER_HBA];
351
352 memset(&target_taken[0], 0, CCISS_MAX_SCSI_DEVS_PER_HBA);
353
354 target_taken[SELF_SCSI_ID] = 1;
355 for (i=0;i<ccissscsi[ctlr].ndevices;i++)
356 target_taken[ccissscsi[ctlr].dev[i].target] = 1;
357
358 for (i=0;i<CCISS_MAX_SCSI_DEVS_PER_HBA;i++) {
359 if (!target_taken[i]) {
360 *bus = 0; *target=i; *lun = 0; found=1;
361 break;
362 }
363 }
364 return (!found);
365}
366
367static int
368cciss_scsi_add_entry(int ctlr, int hostno,
369 unsigned char *scsi3addr, int devtype)
370{
371 /* assumes hba[ctlr]->scsi_ctlr->lock is held */
372 int n = ccissscsi[ctlr].ndevices;
373 struct cciss_scsi_dev_t *sd;
374
375 if (n >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
376 printk("cciss%d: Too many devices, "
377 "some will be inaccessible.\n", ctlr);
378 return -1;
379 }
380 sd = &ccissscsi[ctlr].dev[n];
381 if (find_bus_target_lun(ctlr, &sd->bus, &sd->target, &sd->lun) != 0)
382 return -1;
383 memcpy(&sd->scsi3addr[0], scsi3addr, 8);
384 sd->devtype = devtype;
385 ccissscsi[ctlr].ndevices++;
386
387 /* initially, (before registering with scsi layer) we don't
388 know our hostno and we don't want to print anything first
389 time anyway (the scsi layer's inquiries will show that info) */
390 if (hostno != -1)
391 printk("cciss%d: %s device c%db%dt%dl%d added.\n",
392 ctlr, DEVICETYPE(sd->devtype), hostno,
393 sd->bus, sd->target, sd->lun);
394 return 0;
395}
396
397static void
398cciss_scsi_remove_entry(int ctlr, int hostno, int entry)
399{
400 /* assumes hba[ctlr]->scsi_ctlr->lock is held */
401 int i;
402 struct cciss_scsi_dev_t sd;
403
404 if (entry < 0 || entry >= CCISS_MAX_SCSI_DEVS_PER_HBA) return;
405 sd = ccissscsi[ctlr].dev[entry];
406 for (i=entry;i<ccissscsi[ctlr].ndevices-1;i++)
407 ccissscsi[ctlr].dev[i] = ccissscsi[ctlr].dev[i+1];
408 ccissscsi[ctlr].ndevices--;
409 printk("cciss%d: %s device c%db%dt%dl%d removed.\n",
410 ctlr, DEVICETYPE(sd.devtype), hostno,
411 sd.bus, sd.target, sd.lun);
412}
413
414
415#define SCSI3ADDR_EQ(a,b) ( \
416 (a)[7] == (b)[7] && \
417 (a)[6] == (b)[6] && \
418 (a)[5] == (b)[5] && \
419 (a)[4] == (b)[4] && \
420 (a)[3] == (b)[3] && \
421 (a)[2] == (b)[2] && \
422 (a)[1] == (b)[1] && \
423 (a)[0] == (b)[0])
424
425static int
426adjust_cciss_scsi_table(int ctlr, int hostno,
427 struct cciss_scsi_dev_t sd[], int nsds)
428{
429 /* sd contains scsi3 addresses and devtypes, but
430 bus target and lun are not filled in. This funciton
431 takes what's in sd to be the current and adjusts
432 ccissscsi[] to be in line with what's in sd. */
433
434 int i,j, found, changes=0;
435 struct cciss_scsi_dev_t *csd;
436 unsigned long flags;
437
438 CPQ_TAPE_LOCK(ctlr, flags);
439
440 /* find any devices in ccissscsi[] that are not in
441 sd[] and remove them from ccissscsi[] */
442
443 i = 0;
444 while(i<ccissscsi[ctlr].ndevices) {
445 csd = &ccissscsi[ctlr].dev[i];
446 found=0;
447 for (j=0;j<nsds;j++) {
448 if (SCSI3ADDR_EQ(sd[j].scsi3addr,
449 csd->scsi3addr)) {
450 if (sd[j].devtype == csd->devtype)
451 found=2;
452 else
453 found=1;
454 break;
455 }
456 }
457
458 if (found == 0) { /* device no longer present. */
459 changes++;
460 /* printk("cciss%d: %s device c%db%dt%dl%d removed.\n",
461 ctlr, DEVICETYPE(csd->devtype), hostno,
462 csd->bus, csd->target, csd->lun); */
463 cciss_scsi_remove_entry(ctlr, hostno, i);
464 /* note, i not incremented */
465 }
466 else if (found == 1) { /* device is different kind */
467 changes++;
468 printk("cciss%d: device c%db%dt%dl%d type changed "
469 "(device type now %s).\n",
470 ctlr, hostno, csd->bus, csd->target, csd->lun,
471 DEVICETYPE(csd->devtype));
472 csd->devtype = sd[j].devtype;
473 i++; /* so just move along. */
474 } else /* device is same as it ever was, */
475 i++; /* so just move along. */
476 }
477
478 /* Now, make sure every device listed in sd[] is also
479 listed in ccissscsi[], adding them if they aren't found */
480
481 for (i=0;i<nsds;i++) {
482 found=0;
483 for (j=0;j<ccissscsi[ctlr].ndevices;j++) {
484 csd = &ccissscsi[ctlr].dev[j];
485 if (SCSI3ADDR_EQ(sd[i].scsi3addr,
486 csd->scsi3addr)) {
487 if (sd[i].devtype == csd->devtype)
488 found=2; /* found device */
489 else
490 found=1; /* found a bug. */
491 break;
492 }
493 }
494 if (!found) {
495 changes++;
496 if (cciss_scsi_add_entry(ctlr, hostno,
497 &sd[i].scsi3addr[0], sd[i].devtype) != 0)
498 break;
499 } else if (found == 1) {
500 /* should never happen... */
501 changes++;
502 printk("cciss%d: device unexpectedly changed type\n",
503 ctlr);
504 /* but if it does happen, we just ignore that device */
505 }
506 }
507 CPQ_TAPE_UNLOCK(ctlr, flags);
508
509 if (!changes)
510 printk("cciss%d: No device changes detected.\n", ctlr);
511
512 return 0;
513}
514
515static int
516lookup_scsi3addr(int ctlr, int bus, int target, int lun, char *scsi3addr)
517{
518 int i;
519 struct cciss_scsi_dev_t *sd;
520 unsigned long flags;
521
522 CPQ_TAPE_LOCK(ctlr, flags);
523 for (i=0;i<ccissscsi[ctlr].ndevices;i++) {
524 sd = &ccissscsi[ctlr].dev[i];
525 if (sd->bus == bus &&
526 sd->target == target &&
527 sd->lun == lun) {
528 memcpy(scsi3addr, &sd->scsi3addr[0], 8);
529 CPQ_TAPE_UNLOCK(ctlr, flags);
530 return 0;
531 }
532 }
533 CPQ_TAPE_UNLOCK(ctlr, flags);
534 return -1;
535}
536
537static void
538cciss_scsi_setup(int cntl_num)
539{
540 struct cciss_scsi_adapter_data_t * shba;
541
542 ccissscsi[cntl_num].ndevices = 0;
543 shba = (struct cciss_scsi_adapter_data_t *)
544 kmalloc(sizeof(*shba), GFP_KERNEL);
545 if (shba == NULL)
546 return;
547 shba->scsi_host = NULL;
548 spin_lock_init(&shba->lock);
549 shba->registered = 0;
550 if (scsi_cmd_stack_setup(cntl_num, shba) != 0) {
551 kfree(shba);
552 shba = NULL;
553 }
554 hba[cntl_num]->scsi_ctlr = (void *) shba;
555 return;
556}
557
558static void
559complete_scsi_command( CommandList_struct *cp, int timeout, __u32 tag)
560{
561 struct scsi_cmnd *cmd;
562 ctlr_info_t *ctlr;
563 u64bit addr64;
564 ErrorInfo_struct *ei;
565
566 ei = cp->err_info;
567
568 /* First, see if it was a message rather than a command */
569 if (cp->Request.Type.Type == TYPE_MSG) {
570 cp->cmd_type = CMD_MSG_DONE;
571 return;
572 }
573
574 cmd = (struct scsi_cmnd *) cp->scsi_cmd;
575 ctlr = hba[cp->ctlr];
576
577 /* undo the DMA mappings */
578
579 if (cmd->use_sg) {
580 pci_unmap_sg(ctlr->pdev,
581 cmd->buffer, cmd->use_sg,
582 cmd->sc_data_direction);
583 }
584 else if (cmd->request_bufflen) {
585 addr64.val32.lower = cp->SG[0].Addr.lower;
586 addr64.val32.upper = cp->SG[0].Addr.upper;
587 pci_unmap_single(ctlr->pdev, (dma_addr_t) addr64.val,
588 cmd->request_bufflen,
589 cmd->sc_data_direction);
590 }
591
592 cmd->result = (DID_OK << 16); /* host byte */
593 cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
594 /* cmd->result |= (GOOD < 1); */ /* status byte */
595
596 cmd->result |= (ei->ScsiStatus);
597 /* printk("Scsistatus is 0x%02x\n", ei->ScsiStatus); */
598
599 /* copy the sense data whether we need to or not. */
600
601 memcpy(cmd->sense_buffer, ei->SenseInfo,
602 ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
603 SCSI_SENSE_BUFFERSIZE :
604 ei->SenseLen);
605 cmd->resid = ei->ResidualCnt;
606
607 if(ei->CommandStatus != 0)
608 { /* an error has occurred */
609 switch(ei->CommandStatus)
610 {
611 case CMD_TARGET_STATUS:
612 /* Pass it up to the upper layers... */
613 if( ei->ScsiStatus)
614 {
615#if 0
616 printk(KERN_WARNING "cciss: cmd %p "
617 "has SCSI Status = %x\n",
618 cp,
619 ei->ScsiStatus);
620#endif
621 cmd->result |= (ei->ScsiStatus < 1);
622 }
623 else { /* scsi status is zero??? How??? */
624
625 /* Ordinarily, this case should never happen, but there is a bug
626 in some released firmware revisions that allows it to happen
627 if, for example, a 4100 backplane loses power and the tape
628 drive is in it. We assume that it's a fatal error of some
629 kind because we can't show that it wasn't. We will make it
630 look like selection timeout since that is the most common
631 reason for this to occur, and it's severe enough. */
632
633 cmd->result = DID_NO_CONNECT << 16;
634 }
635 break;
636 case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
637 break;
638 case CMD_DATA_OVERRUN:
639 printk(KERN_WARNING "cciss: cp %p has"
640 " completed with data overrun "
641 "reported\n", cp);
642 break;
643 case CMD_INVALID: {
644 /* print_bytes(cp, sizeof(*cp), 1, 0);
645 print_cmd(cp); */
646 /* We get CMD_INVALID if you address a non-existent tape drive instead
647 of a selection timeout (no response). You will see this if you yank
648 out a tape drive, then try to access it. This is kind of a shame
649 because it means that any other CMD_INVALID (e.g. driver bug) will
650 get interpreted as a missing target. */
651 cmd->result = DID_NO_CONNECT << 16;
652 }
653 break;
654 case CMD_PROTOCOL_ERR:
655 printk(KERN_WARNING "cciss: cp %p has "
656 "protocol error \n", cp);
657 break;
658 case CMD_HARDWARE_ERR:
659 cmd->result = DID_ERROR << 16;
660 printk(KERN_WARNING "cciss: cp %p had "
661 " hardware error\n", cp);
662 break;
663 case CMD_CONNECTION_LOST:
664 cmd->result = DID_ERROR << 16;
665 printk(KERN_WARNING "cciss: cp %p had "
666 "connection lost\n", cp);
667 break;
668 case CMD_ABORTED:
669 cmd->result = DID_ABORT << 16;
670 printk(KERN_WARNING "cciss: cp %p was "
671 "aborted\n", cp);
672 break;
673 case CMD_ABORT_FAILED:
674 cmd->result = DID_ERROR << 16;
675 printk(KERN_WARNING "cciss: cp %p reports "
676 "abort failed\n", cp);
677 break;
678 case CMD_UNSOLICITED_ABORT:
679 cmd->result = DID_ABORT << 16;
680 printk(KERN_WARNING "cciss: cp %p aborted "
681 "do to an unsolicited abort\n", cp);
682 break;
683 case CMD_TIMEOUT:
684 cmd->result = DID_TIME_OUT << 16;
685 printk(KERN_WARNING "cciss: cp %p timedout\n",
686 cp);
687 break;
688 default:
689 cmd->result = DID_ERROR << 16;
690 printk(KERN_WARNING "cciss: cp %p returned "
691 "unknown status %x\n", cp,
692 ei->CommandStatus);
693 }
694 }
695 // printk("c:%p:c%db%dt%dl%d ", cmd, ctlr->ctlr, cmd->channel,
696 // cmd->target, cmd->lun);
697 cmd->scsi_done(cmd);
698 scsi_cmd_free(ctlr, cp);
699}
700
701static int
702cciss_scsi_detect(int ctlr)
703{
704 struct Scsi_Host *sh;
705 int error;
706
707 sh = scsi_host_alloc(&cciss_driver_template, sizeof(struct ctlr_info *));
708 if (sh == NULL)
709 goto fail;
710 sh->io_port = 0; // good enough? FIXME,
711 sh->n_io_port = 0; // I don't think we use these two...
712 sh->this_id = SELF_SCSI_ID;
713
714 ((struct cciss_scsi_adapter_data_t *)
715 hba[ctlr]->scsi_ctlr)->scsi_host = (void *) sh;
716 sh->hostdata[0] = (unsigned long) hba[ctlr];
fb86a35b 717 sh->irq = hba[ctlr]->intr[SIMPLE_MODE_INT];
1da177e4
LT		 718 sh->unique_id = sh->irq;
719 error = scsi_add_host(sh, &hba[ctlr]->pdev->dev);
720 if (error)
721 goto fail_host_put;
722 scsi_scan_host(sh);
723 return 1;
724
725 fail_host_put:
726 scsi_host_put(sh);
727 fail:
728 return 0;
729}
730
731static void
732cciss_unmap_one(struct pci_dev *pdev,
733 CommandList_struct *cp,
734 size_t buflen,
735 int data_direction)
736{
737 u64bit addr64;
738
739 addr64.val32.lower = cp->SG[0].Addr.lower;
740 addr64.val32.upper = cp->SG[0].Addr.upper;
741 pci_unmap_single(pdev, (dma_addr_t) addr64.val, buflen, data_direction);
742}
743
744static void
745cciss_map_one(struct pci_dev *pdev,
746 CommandList_struct *cp,
747 unsigned char *buf,
748 size_t buflen,
749 int data_direction)
750{
751 __u64 addr64;
752
753 addr64 = (__u64) pci_map_single(pdev, buf, buflen, data_direction);
754 cp->SG[0].Addr.lower =
755 (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
756 cp->SG[0].Addr.upper =
757 (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
758 cp->SG[0].Len = buflen;
759 cp->Header.SGList = (__u8) 1; /* no. SGs contig in this cmd */
760 cp->Header.SGTotal = (__u16) 1; /* total sgs in this cmd list */
761}
762
763static int
764cciss_scsi_do_simple_cmd(ctlr_info_t *c,
765 CommandList_struct *cp,
766 unsigned char *scsi3addr,
767 unsigned char *cdb,
768 unsigned char cdblen,
769 unsigned char *buf, int bufsize,
770 int direction)
771{
772 unsigned long flags;
773 DECLARE_COMPLETION(wait);
774
775 cp->cmd_type = CMD_IOCTL_PEND; // treat this like an ioctl
776 cp->scsi_cmd = NULL;
777 cp->Header.ReplyQueue = 0; // unused in simple mode
778 memcpy(&cp->Header.LUN, scsi3addr, sizeof(cp->Header.LUN));
779 cp->Header.Tag.lower = cp->busaddr; // Use k. address of cmd as tag
780 // Fill in the request block...
781
782 /* printk("Using scsi3addr 0x%02x%0x2%0x2%0x2%0x2%0x2%0x2%0x2\n",
783 scsi3addr[0], scsi3addr[1], scsi3addr[2], scsi3addr[3],
784 scsi3addr[4], scsi3addr[5], scsi3addr[6], scsi3addr[7]); */
785
786 memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB));
787 memcpy(cp->Request.CDB, cdb, cdblen);
788 cp->Request.Timeout = 0;
789 cp->Request.CDBLen = cdblen;
790 cp->Request.Type.Type = TYPE_CMD;
791 cp->Request.Type.Attribute = ATTR_SIMPLE;
792 cp->Request.Type.Direction = direction;
793
794 /* Fill in the SG list and do dma mapping */
795 cciss_map_one(c->pdev, cp, (unsigned char *) buf,
796 bufsize, DMA_FROM_DEVICE);
797
798 cp->waiting = &wait;
799
800 /* Put the request on the tail of the request queue */
801 spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
802 addQ(&c->reqQ, cp);
803 c->Qdepth++;
804 start_io(c);
805 spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
806
807 wait_for_completion(&wait);
808
809 /* undo the dma mapping */
810 cciss_unmap_one(c->pdev, cp, bufsize, DMA_FROM_DEVICE);
811 return(0);
812}
813
814static void
815cciss_scsi_interpret_error(CommandList_struct *cp)
816{
817 ErrorInfo_struct *ei;
818
819 ei = cp->err_info;
820 switch(ei->CommandStatus)
821 {
822 case CMD_TARGET_STATUS:
823 printk(KERN_WARNING "cciss: cmd %p has "
824 "completed with errors\n", cp);
825 printk(KERN_WARNING "cciss: cmd %p "
826 "has SCSI Status = %x\n",
827 cp,
828 ei->ScsiStatus);
829 if (ei->ScsiStatus == 0)
830 printk(KERN_WARNING
831 "cciss:SCSI status is abnormally zero. "
832 "(probably indicates selection timeout "
833 "reported incorrectly due to a known "
834 "firmware bug, circa July, 2001.)\n");
835 break;
836 case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
837 printk("UNDERRUN\n");
838 break;
839 case CMD_DATA_OVERRUN:
840 printk(KERN_WARNING "cciss: cp %p has"
841 " completed with data overrun "
842 "reported\n", cp);
843 break;
844 case CMD_INVALID: {
845 /* controller unfortunately reports SCSI passthru's */
846 /* to non-existent targets as invalid commands. */
847 printk(KERN_WARNING "cciss: cp %p is "
848 "reported invalid (probably means "
849 "target device no longer present)\n",
850 cp);
851 /* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0);
852 print_cmd(cp); */
853 }
854 break;
855 case CMD_PROTOCOL_ERR:
856 printk(KERN_WARNING "cciss: cp %p has "
857 "protocol error \n", cp);
858 break;
859 case CMD_HARDWARE_ERR:
860 /* cmd->result = DID_ERROR << 16; */
861 printk(KERN_WARNING "cciss: cp %p had "
862 " hardware error\n", cp);
863 break;
864 case CMD_CONNECTION_LOST:
865 printk(KERN_WARNING "cciss: cp %p had "
866 "connection lost\n", cp);
867 break;
868 case CMD_ABORTED:
869 printk(KERN_WARNING "cciss: cp %p was "
870 "aborted\n", cp);
871 break;
872 case CMD_ABORT_FAILED:
873 printk(KERN_WARNING "cciss: cp %p reports "
874 "abort failed\n", cp);
875 break;
876 case CMD_UNSOLICITED_ABORT:
877 printk(KERN_WARNING "cciss: cp %p aborted "
878 "do to an unsolicited abort\n", cp);
879 break;
880 case CMD_TIMEOUT:
881 printk(KERN_WARNING "cciss: cp %p timedout\n",
882 cp);
883 break;
884 default:
885 printk(KERN_WARNING "cciss: cp %p returned "
886 "unknown status %x\n", cp,
887 ei->CommandStatus);
888 }
889}
890
891static int
892cciss_scsi_do_inquiry(ctlr_info_t *c, unsigned char *scsi3addr,
47922d06 893 unsigned char *buf, unsigned char bufsize)
1da177e4
LT		 894{
895 int rc;
896 CommandList_struct *cp;
897 char cdb[6];
898 ErrorInfo_struct *ei;
899 unsigned long flags;
900
901 spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
902 cp = scsi_cmd_alloc(c);
903 spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
904
905 if (cp == NULL) { /* trouble... */
906 printk("cmd_alloc returned NULL!\n");
907 return -1;
908 }
909
910 ei = cp->err_info;
911
912 cdb[0] = CISS_INQUIRY;
913 cdb[1] = 0;
914 cdb[2] = 0;
915 cdb[3] = 0;
47922d06 916 cdb[4] = bufsize;
1da177e4
LT		 917 cdb[5] = 0;
918 rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr, cdb,
47922d06 919 6, buf, bufsize, XFER_READ);
1da177e4
LT		 920
921 if (rc != 0) return rc; /* something went wrong */
922
923 if (ei->CommandStatus != 0 &&
924 ei->CommandStatus != CMD_DATA_UNDERRUN) {
925 cciss_scsi_interpret_error(cp);
926 rc = -1;
927 }
928 spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
929 scsi_cmd_free(c, cp);
930 spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
931 return rc;
932}
933
934static int
935cciss_scsi_do_report_phys_luns(ctlr_info_t *c,
936 ReportLunData_struct *buf, int bufsize)
937{
938 int rc;
939 CommandList_struct *cp;
940 unsigned char cdb[12];
941 unsigned char scsi3addr[8];
942 ErrorInfo_struct *ei;
943 unsigned long flags;
944
945 spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
946 cp = scsi_cmd_alloc(c);
947 spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
948 if (cp == NULL) { /* trouble... */
949 printk("cmd_alloc returned NULL!\n");
950 return -1;
951 }
952
953 memset(&scsi3addr[0], 0, 8); /* address the controller */
954 cdb[0] = CISS_REPORT_PHYS;
955 cdb[1] = 0;
956 cdb[2] = 0;
957 cdb[3] = 0;
958 cdb[4] = 0;
959 cdb[5] = 0;
960 cdb[6] = (bufsize >> 24) & 0xFF; //MSB
961 cdb[7] = (bufsize >> 16) & 0xFF;
962 cdb[8] = (bufsize >> 8) & 0xFF;
963 cdb[9] = bufsize & 0xFF;
964 cdb[10] = 0;
965 cdb[11] = 0;
966
967 rc = cciss_scsi_do_simple_cmd(c, cp, scsi3addr,
968 cdb, 12,
969 (unsigned char *) buf,
970 bufsize, XFER_READ);
971
972 if (rc != 0) return rc; /* something went wrong */
973
974 ei = cp->err_info;
975 if (ei->CommandStatus != 0 &&
976 ei->CommandStatus != CMD_DATA_UNDERRUN) {
977 cciss_scsi_interpret_error(cp);
978 rc = -1;
979 }
980 spin_lock_irqsave(CCISS_LOCK(c->ctlr), flags);
981 scsi_cmd_free(c, cp);
982 spin_unlock_irqrestore(CCISS_LOCK(c->ctlr), flags);
983 return rc;
984}
985
986static void
987cciss_update_non_disk_devices(int cntl_num, int hostno)
988{
989 /* the idea here is we could get notified from /proc
990 that some devices have changed, so we do a report
991 physical luns cmd, and adjust our list of devices
992 accordingly. (We can't rely on the scsi-mid layer just
993 doing inquiries, because the "busses" that the scsi
994 mid-layer probes are totally fabricated by this driver,
995 so new devices wouldn't show up.
996
997 the scsi3addr's of devices won't change so long as the
998 adapter is not reset. That means we can rescan and
999 tell which devices we already know about, vs. new
1000 devices, vs. disappearing devices.
1001
1002 Also, if you yank out a tape drive, then put in a disk
1003 in it's place, (say, a configured volume from another
1004 array controller for instance) _don't_ poke this driver
1005 (so it thinks it's still a tape, but _do_ poke the scsi
1006 mid layer, so it does an inquiry... the scsi mid layer
1007 will see the physical disk. This would be bad. Need to
1008 think about how to prevent that. One idea would be to
1009 snoop all scsi responses and if an inquiry repsonse comes
1010 back that reports a disk, chuck it an return selection
1011 timeout instead and adjust our table... Not sure i like
1012 that though.
1013
1014 */
47922d06
MM		 1015#define OBDR_TAPE_INQ_SIZE 49
1016#define OBDR_TAPE_SIG "$DR-10"
1da177e4 1017 ReportLunData_struct *ld_buff;
47922d06 1018 unsigned char *inq_buff;
1da177e4
LT		 1019 unsigned char scsi3addr[8];
1020 ctlr_info_t *c;
1021 __u32 num_luns=0;
1022 unsigned char *ch;
1023 /* unsigned char found[CCISS_MAX_SCSI_DEVS_PER_HBA]; */
1024 struct cciss_scsi_dev_t currentsd[CCISS_MAX_SCSI_DEVS_PER_HBA];
1025 int ncurrent=0;
1026 int reportlunsize = sizeof(*ld_buff) + CISS_MAX_PHYS_LUN * 8;
1027 int i;
1028
1029 c = (ctlr_info_t *) hba[cntl_num];
1030 ld_buff = kmalloc(reportlunsize, GFP_KERNEL);
1031 if (ld_buff == NULL) {
1032 printk(KERN_ERR "cciss: out of memory\n");
1033 return;
1034 }
1035 memset(ld_buff, 0, reportlunsize);
47922d06 1036 inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1da177e4
LT		 1037 if (inq_buff == NULL) {
1038 printk(KERN_ERR "cciss: out of memory\n");
1039 kfree(ld_buff);
1040 return;
1041 }
1042
1043 if (cciss_scsi_do_report_phys_luns(c, ld_buff, reportlunsize) == 0) {
1044 ch = &ld_buff->LUNListLength[0];
1045 num_luns = ((ch[0]<<24) | (ch[1]<<16) | (ch[2]<<8) | ch[3]) / 8;
1046 if (num_luns > CISS_MAX_PHYS_LUN) {
1047 printk(KERN_WARNING
1048 "cciss: Maximum physical LUNs (%d) exceeded. "
1049 "%d LUNs ignored.\n", CISS_MAX_PHYS_LUN,
1050 num_luns - CISS_MAX_PHYS_LUN);
1051 num_luns = CISS_MAX_PHYS_LUN;
1052 }
1053 }
1054 else {
1055 printk(KERN_ERR "cciss: Report physical LUNs failed.\n");
1056 goto out;
1057 }
1058
1059
1060 /* adjust our table of devices */
1061 for(i=0; i<num_luns; i++)
1062 {
1063 int devtype;
1064
1065 /* for each physical lun, do an inquiry */
1066 if (ld_buff->LUN[i][3] & 0xC0) continue;
47922d06 1067 memset(inq_buff, 0, OBDR_TAPE_INQ_SIZE);
1da177e4
LT		 1068 memcpy(&scsi3addr[0], &ld_buff->LUN[i][0], 8);
1069
47922d06
MM		 1070 if (cciss_scsi_do_inquiry(hba[cntl_num], scsi3addr, inq_buff,
1071 (unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
1da177e4
LT		 1072 /* Inquiry failed (msg printed already) */
1073 devtype = 0; /* so we will skip this device. */
1074 } else /* what kind of device is this? */
47922d06 1075 devtype = (inq_buff[0] & 0x1f);
1da177e4
LT		 1076
1077 switch (devtype)
1078 {
47922d06
MM		 1079 case 0x05: /* CD-ROM */ {
1080
1081 /* We don't *really* support actual CD-ROM devices,
1082 * just this "One Button Disaster Recovery" tape drive
1083 * which temporarily pretends to be a CD-ROM drive.
1084 * So we check that the device is really an OBDR tape
1085 * device by checking for "$DR-10" in bytes 43-48 of
1086 * the inquiry data.
1087 */
1088 char obdr_sig[7];
1089
1090 strncpy(obdr_sig, &inq_buff[43], 6);
1091 obdr_sig[6] = '\0';
1092 if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
1093 /* Not OBDR device, ignore it. */
1094 break;
1095 }
1096 /* fall through . . . */
1da177e4
LT		 1097 case 0x01: /* sequential access, (tape) */
1098 case 0x08: /* medium changer */
1099 if (ncurrent >= CCISS_MAX_SCSI_DEVS_PER_HBA) {
1100 printk(KERN_INFO "cciss%d: %s ignored, "
1101 "too many devices.\n", cntl_num,
1102 DEVICETYPE(devtype));
1103 break;
1104 }
1105 memcpy(&currentsd[ncurrent].scsi3addr[0],
1106 &scsi3addr[0], 8);
1107 currentsd[ncurrent].devtype = devtype;
1108 currentsd[ncurrent].bus = -1;
1109 currentsd[ncurrent].target = -1;
1110 currentsd[ncurrent].lun = -1;
1111 ncurrent++;
1112 break;
1113 default:
1114 break;
1115 }
1116 }
1117
1118 adjust_cciss_scsi_table(cntl_num, hostno, currentsd, ncurrent);
1119out:
1120 kfree(inq_buff);
1121 kfree(ld_buff);
1122 return;
1123}
1124
1125static int
1126is_keyword(char *ptr, int len, char *verb) // Thanks to ncr53c8xx.c
1127{
1128 int verb_len = strlen(verb);
1129 if (len >= verb_len && !memcmp(verb,ptr,verb_len))
1130 return verb_len;
1131 else
1132 return 0;
1133}
1134
1135static int
1136cciss_scsi_user_command(int ctlr, int hostno, char *buffer, int length)
1137{
1138 int arg_len;
1139
1140 if ((arg_len = is_keyword(buffer, length, "rescan")) != 0)
1141 cciss_update_non_disk_devices(ctlr, hostno);
1142 else
1143 return -EINVAL;
1144 return length;
1145}
1146
1147
1148static int
1149cciss_scsi_proc_info(struct Scsi_Host *sh,
1150 char *buffer, /* data buffer */
1151 char **start, /* where data in buffer starts */
1152 off_t offset, /* offset from start of imaginary file */
1153 int length, /* length of data in buffer */
1154 int func) /* 0 == read, 1 == write */
1155{
1156
1157 int buflen, datalen;
1158 ctlr_info_t *ci;
b9f0bd08 1159 int i;
1da177e4
LT		 1160 int cntl_num;
1161
1162
1163 ci = (ctlr_info_t *) sh->hostdata[0];
1164 if (ci == NULL) /* This really shouldn't ever happen. */
1165 return -EINVAL;
1166
1167 cntl_num = ci->ctlr; /* Get our index into the hba[] array */
1168
1169 if (func == 0) { /* User is reading from /proc/scsi/ciss*?/?* */
b9f0bd08
MM		 1170 buflen = sprintf(buffer, "cciss%d: SCSI host: %d\n",
1171 cntl_num, sh->host_no);
1172
1173 /* this information is needed by apps to know which cciss
1174 device corresponds to which scsi host number without
1175 having to open a scsi target device node. The device
1176 information is not a duplicate of /proc/scsi/scsi because
1177 the two may be out of sync due to scsi hotplug, rather
1178 this info is for an app to be able to use to know how to
1179 get them back in sync. */
1180
1181 for (i=0;i<ccissscsi[cntl_num].ndevices;i++) {
1182 struct cciss_scsi_dev_t *sd = &ccissscsi[cntl_num].dev[i];
1183 buflen += sprintf(&buffer[buflen], "c%db%dt%dl%d %02d "
1184 "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
1185 sh->host_no, sd->bus, sd->target, sd->lun,
1186 sd->devtype,
1187 sd->scsi3addr[0], sd->scsi3addr[1],
1188 sd->scsi3addr[2], sd->scsi3addr[3],
1189 sd->scsi3addr[4], sd->scsi3addr[5],
1190 sd->scsi3addr[6], sd->scsi3addr[7]);
1191 }
1da177e4
LT		 1192 datalen = buflen - offset;
1193 if (datalen < 0) { /* they're reading past EOF. */
1194 datalen = 0;
1195 *start = buffer+buflen;
1196 } else
1197 *start = buffer + offset;
1198 return(datalen);
1199 } else /* User is writing to /proc/scsi/cciss*?/?* ... */
1200 return cciss_scsi_user_command(cntl_num, sh->host_no,
1201 buffer, length);
1202}
1203
1204/* cciss_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
1205 dma mapping and fills in the scatter gather entries of the
1206 cciss command, cp. */
1207
1208static void
1209cciss_scatter_gather(struct pci_dev *pdev,
1210 CommandList_struct *cp,
1211 struct scsi_cmnd *cmd)
1212{
1213 unsigned int use_sg, nsegs=0, len;
1214 struct scatterlist *scatter = (struct scatterlist *) cmd->buffer;
1215 __u64 addr64;
1216
1217 /* is it just one virtual address? */
1218 if (!cmd->use_sg) {
1219 if (cmd->request_bufflen) { /* anything to xfer? */
1220
1221 addr64 = (__u64) pci_map_single(pdev,
1222 cmd->request_buffer,
1223 cmd->request_bufflen,
1224 cmd->sc_data_direction);
1225
1226 cp->SG[0].Addr.lower =
1227 (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
1228 cp->SG[0].Addr.upper =
1229 (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
1230 cp->SG[0].Len = cmd->request_bufflen;
1231 nsegs=1;
1232 }
1233 } /* else, must be a list of virtual addresses.... */
1234 else if (cmd->use_sg <= MAXSGENTRIES) { /* not too many addrs? */
1235
1236 use_sg = pci_map_sg(pdev, cmd->buffer, cmd->use_sg,
1237 cmd->sc_data_direction);
1238
1239 for (nsegs=0; nsegs < use_sg; nsegs++) {
1240 addr64 = (__u64) sg_dma_address(&scatter[nsegs]);
1241 len = sg_dma_len(&scatter[nsegs]);
1242 cp->SG[nsegs].Addr.lower =
1243 (__u32) (addr64 & (__u64) 0x00000000FFFFFFFF);
1244 cp->SG[nsegs].Addr.upper =
1245 (__u32) ((addr64 >> 32) & (__u64) 0x00000000FFFFFFFF);
1246 cp->SG[nsegs].Len = len;
1247 cp->SG[nsegs].Ext = 0; // we are not chaining
1248 }
1249 } else BUG();
1250
1251 cp->Header.SGList = (__u8) nsegs; /* no. SGs contig in this cmd */
1252 cp->Header.SGTotal = (__u16) nsegs; /* total sgs in this cmd list */
1253 return;
1254}
1255
1256
1257static int
1258cciss_scsi_queue_command (struct scsi_cmnd *cmd, void (* done)(struct scsi_cmnd *))
1259{
1260 ctlr_info_t **c;
1261 int ctlr, rc;
1262 unsigned char scsi3addr[8];
1263 CommandList_struct *cp;
1264 unsigned long flags;
1265
1266 // Get the ptr to our adapter structure (hba[i]) out of cmd->host.
1267 // We violate cmd->host privacy here. (Is there another way?)
1268 c = (ctlr_info_t **) &cmd->device->host->hostdata[0];
1269 ctlr = (*c)->ctlr;
1270
1271 rc = lookup_scsi3addr(ctlr, cmd->device->channel, cmd->device->id,
1272 cmd->device->lun, scsi3addr);
1273 if (rc != 0) {
1274 /* the scsi nexus does not match any that we presented... */
1275 /* pretend to mid layer that we got selection timeout */
1276 cmd->result = DID_NO_CONNECT << 16;
1277 done(cmd);
1278 /* we might want to think about registering controller itself
1279 as a processor device on the bus so sg binds to it. */
1280 return 0;
1281 }
1282
1283 /* printk("cciss_queue_command, p=%p, cmd=0x%02x, c%db%dt%dl%d\n",
1284 cmd, cmd->cmnd[0], ctlr, cmd->channel, cmd->target, cmd->lun);*/
1285 // printk("q:%p:c%db%dt%dl%d ", cmd, ctlr, cmd->channel,
1286 // cmd->target, cmd->lun);
1287
1288 /* Ok, we have a reasonable scsi nexus, so send the cmd down, and
1289 see what the device thinks of it. */
1290
1291 spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1292 cp = scsi_cmd_alloc(*c);
1293 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1294 if (cp == NULL) { /* trouble... */
1295 printk("scsi_cmd_alloc returned NULL!\n");
1296 /* FIXME: next 3 lines are -> BAD! <- */
1297 cmd->result = DID_NO_CONNECT << 16;
1298 done(cmd);
1299 return 0;
1300 }
1301
1302 // Fill in the command list header
1303
1304 cmd->scsi_done = done; // save this for use by completion code
1305
1306 // save cp in case we have to abort it
1307 cmd->host_scribble = (unsigned char *) cp;
1308
1309 cp->cmd_type = CMD_SCSI;
1310 cp->scsi_cmd = cmd;
1311 cp->Header.ReplyQueue = 0; // unused in simple mode
1312 memcpy(&cp->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
1313 cp->Header.Tag.lower = cp->busaddr; // Use k. address of cmd as tag
1314
1315 // Fill in the request block...
1316
1317 cp->Request.Timeout = 0;
1318 memset(cp->Request.CDB, 0, sizeof(cp->Request.CDB));
089fe1b2 1319 BUG_ON(cmd->cmd_len > sizeof(cp->Request.CDB));
1da177e4
LT		 1320 cp->Request.CDBLen = cmd->cmd_len;
1321 memcpy(cp->Request.CDB, cmd->cmnd, cmd->cmd_len);
1322 cp->Request.Type.Type = TYPE_CMD;
1323 cp->Request.Type.Attribute = ATTR_SIMPLE;
1324 switch(cmd->sc_data_direction)
1325 {
1326 case DMA_TO_DEVICE: cp->Request.Type.Direction = XFER_WRITE; break;
1327 case DMA_FROM_DEVICE: cp->Request.Type.Direction = XFER_READ; break;
1328 case DMA_NONE: cp->Request.Type.Direction = XFER_NONE; break;
1329 case DMA_BIDIRECTIONAL:
1330 // This can happen if a buggy application does a scsi passthru
1331 // and sets both inlen and outlen to non-zero. ( see
1332 // ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
1333
1334 cp->Request.Type.Direction = XFER_RSVD;
1335 // This is technically wrong, and cciss controllers should
1336 // reject it with CMD_INVALID, which is the most correct
1337 // response, but non-fibre backends appear to let it
1338 // slide by, and give the same results as if this field
1339 // were set correctly. Either way is acceptable for
1340 // our purposes here.
1341
1342 break;
1343
1344 default:
1345 printk("cciss: unknown data direction: %d\n",
1346 cmd->sc_data_direction);
1347 BUG();
1348 break;
1349 }
1350
1351 cciss_scatter_gather((*c)->pdev, cp, cmd); // Fill the SG list
1352
1353 /* Put the request on the tail of the request queue */
1354
1355 spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1356 addQ(&(*c)->reqQ, cp);
1357 (*c)->Qdepth++;
1358 start_io(*c);
1359 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1360
1361 /* the cmd'll come back via intr handler in complete_scsi_command() */
1362 return 0;
1363}
1364
1365static void
1366cciss_unregister_scsi(int ctlr)
1367{
1368 struct cciss_scsi_adapter_data_t *sa;
1369 struct cciss_scsi_cmd_stack_t *stk;
1370 unsigned long flags;
1371
1372 /* we are being forcibly unloaded, and may not refuse. */
1373
1374 spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1375 sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
1376 stk = &sa->cmd_stack;
1377
1378 /* if we weren't ever actually registered, don't unregister */
1379 if (sa->registered) {
1380 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1381 scsi_remove_host(sa->scsi_host);
1382 scsi_host_put(sa->scsi_host);
1383 spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1384 }
1385
1386 /* set scsi_host to NULL so our detect routine will
1387 find us on register */
1388 sa->scsi_host = NULL;
1389 scsi_cmd_stack_free(ctlr);
1390 kfree(sa);
1391 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1392}
1393
1394static int
1395cciss_register_scsi(int ctlr)
1396{
1397 unsigned long flags;
1398
1399 CPQ_TAPE_LOCK(ctlr, flags);
1400
1401 /* Since this is really a block driver, the SCSI core may not be
1402 initialized at init time, in which case, calling scsi_register_host
1403 would hang. Instead, we do it later, via /proc filesystem
1404 and rc scripts, when we know SCSI core is good to go. */
1405
1406 /* Only register if SCSI devices are detected. */
1407 if (ccissscsi[ctlr].ndevices != 0) {
1408 ((struct cciss_scsi_adapter_data_t *)
1409 hba[ctlr]->scsi_ctlr)->registered = 1;
1410 CPQ_TAPE_UNLOCK(ctlr, flags);
1411 return cciss_scsi_detect(ctlr);
1412 }
1413 CPQ_TAPE_UNLOCK(ctlr, flags);
1414 printk(KERN_INFO
1415 "cciss%d: No appropriate SCSI device detected, "
1416 "SCSI subsystem not engaged.\n", ctlr);
1417 return 0;
1418}
1419
1420static int
1421cciss_engage_scsi(int ctlr)
1422{
1423 struct cciss_scsi_adapter_data_t *sa;
1424 struct cciss_scsi_cmd_stack_t *stk;
1425 unsigned long flags;
1426
1427 spin_lock_irqsave(CCISS_LOCK(ctlr), flags);
1428 sa = (struct cciss_scsi_adapter_data_t *) hba[ctlr]->scsi_ctlr;
1429 stk = &sa->cmd_stack;
1430
1431 if (((struct cciss_scsi_adapter_data_t *)
1432 hba[ctlr]->scsi_ctlr)->registered) {
1433 printk("cciss%d: SCSI subsystem already engaged.\n", ctlr);
1434 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1435 return ENXIO;
1436 }
1437 spin_unlock_irqrestore(CCISS_LOCK(ctlr), flags);
1438 cciss_update_non_disk_devices(ctlr, -1);
1439 cciss_register_scsi(ctlr);
1440 return 0;
1441}
1442
1443static void
1444cciss_proc_tape_report(int ctlr, unsigned char *buffer, off_t *pos, off_t *len)
1445{
1446 unsigned long flags;
1447 int size;
1448
1449 *pos = *pos -1; *len = *len - 1; // cut off the last trailing newline
1450
1451 CPQ_TAPE_LOCK(ctlr, flags);
1452 size = sprintf(buffer + *len,
b9f0bd08 1453 "Sequential access devices: %d\n\n",
1da177e4
LT		 1454 ccissscsi[ctlr].ndevices);
1455 CPQ_TAPE_UNLOCK(ctlr, flags);
1456 *pos += size; *len += size;
1457}
1458
3da8b713 1459/* Need at least one of these error handlers to keep ../scsi/hosts.c from
1460 * complaining. Doing a host- or bus-reset can't do anything good here.
1461 * Despite what it might say in scsi_error.c, there may well be commands
1462 * on the controller, as the cciss driver registers twice, once as a block
1463 * device for the logical drives, and once as a scsi device, for any tape
1464 * drives. So we know there are no commands out on the tape drives, but we
1465 * don't know there are no commands on the controller, and it is likely
1466 * that there probably are, as the cciss block device is most commonly used
1467 * as a boot device (embedded controller on HP/Compaq systems.)
1468*/
1469
1470static int cciss_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
1471{
1472 int rc;
1473 CommandList_struct *cmd_in_trouble;
1474 ctlr_info_t **c;
1475 int ctlr;
1476
1477 /* find the controller to which the command to be aborted was sent */
1478 c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];
1479 if (c == NULL) /* paranoia */
1480 return FAILED;
1481 ctlr = (*c)->ctlr;
1482 printk(KERN_WARNING "cciss%d: resetting tape drive or medium changer.\n", ctlr);
1483
1484 /* find the command that's giving us trouble */
1485 cmd_in_trouble = (CommandList_struct *) scsicmd->host_scribble;
1486 if (cmd_in_trouble == NULL) { /* paranoia */
1487 return FAILED;
1488 }
1489 /* send a reset to the SCSI LUN which the command was sent to */
1490 rc = sendcmd(CCISS_RESET_MSG, ctlr, NULL, 0, 2, 0, 0,
1491 (unsigned char *) &cmd_in_trouble->Header.LUN.LunAddrBytes[0],
1492 TYPE_MSG);
1493 /* sendcmd turned off interrputs on the board, turn 'em back on. */
1494 (*c)->access.set_intr_mask(*c, CCISS_INTR_ON);
1495 if (rc == 0)
1496 return SUCCESS;
1497 printk(KERN_WARNING "cciss%d: resetting device failed.\n", ctlr);
1498 return FAILED;
1499}
1500
1501static int cciss_eh_abort_handler(struct scsi_cmnd *scsicmd)
1502{
1503 int rc;
1504 CommandList_struct *cmd_to_abort;
1505 ctlr_info_t **c;
1506 int ctlr;
1507
1508 /* find the controller to which the command to be aborted was sent */
1509 c = (ctlr_info_t **) &scsicmd->device->host->hostdata[0];
1510 if (c == NULL) /* paranoia */
1511 return FAILED;
1512 ctlr = (*c)->ctlr;
1513 printk(KERN_WARNING "cciss%d: aborting tardy SCSI cmd\n", ctlr);
1514
1515 /* find the command to be aborted */
1516 cmd_to_abort = (CommandList_struct *) scsicmd->host_scribble;
1517 if (cmd_to_abort == NULL) /* paranoia */
1518 return FAILED;
1519 rc = sendcmd(CCISS_ABORT_MSG, ctlr, &cmd_to_abort->Header.Tag,
1520 0, 2, 0, 0,
1521 (unsigned char *) &cmd_to_abort->Header.LUN.LunAddrBytes[0],
1522 TYPE_MSG);
1523 /* sendcmd turned off interrputs on the board, turn 'em back on. */
1524 (*c)->access.set_intr_mask(*c, CCISS_INTR_ON);
1525 if (rc == 0)
1526 return SUCCESS;
1527 return FAILED;
1528
1529}
1530
1da177e4
LT		 1531#else /* no CONFIG_CISS_SCSI_TAPE */
1532
1533/* If no tape support, then these become defined out of existence */
1534
1535#define cciss_scsi_setup(cntl_num)
1536#define cciss_unregister_scsi(ctlr)
1537#define cciss_register_scsi(ctlr)
1538#define cciss_proc_tape_report(ctlr, buffer, pos, len)
1539
1540#endif /* CONFIG_CISS_SCSI_TAPE */
Linux 6.x block layer and io_uring tree(s)