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[PATCH] Move read_mostly definition to asm/cache.h
[linux-2.6/mini2440.git] / drivers / scsi / scsi_debug.c
blob5a5d2af8ee43bdae6f8f0fa8523be9e243d0f4b4
1 /*
2 * linux/kernel/scsi_debug.c
3 * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
4 * Copyright (C) 1992 Eric Youngdale
5 * Simulate a host adapter with 2 disks attached. Do a lot of checking
6 * to make sure that we are not getting blocks mixed up, and PANIC if
7 * anything out of the ordinary is seen.
8 * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
9 *
10 * This version is more generic, simulating a variable number of disk
11 * (or disk like devices) sharing a common amount of RAM
12 *
13 *
14 * For documentation see http://www.torque.net/sg/sdebug26.html
15 *
16 * D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
17 * dpg: work for devfs large number of disks [20010809]
18 * forked for lk 2.5 series [20011216, 20020101]
19 * use vmalloc() more inquiry+mode_sense [20020302]
20 * add timers for delayed responses [20020721]
21 * Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
22 * Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
23 * dpg: change style of boot options to "scsi_debug.num_tgts=2" and
24 * module options to "modprobe scsi_debug num_tgts=2" [20021221]
25 */
26
27 #include <linux/config.h>
28 #include <linux/module.h>
29
30 #include <linux/kernel.h>
31 #include <linux/sched.h>
32 #include <linux/errno.h>
33 #include <linux/timer.h>
34 #include <linux/types.h>
35 #include <linux/string.h>
36 #include <linux/genhd.h>
37 #include <linux/fs.h>
38 #include <linux/init.h>
39 #include <linux/proc_fs.h>
40 #include <linux/smp_lock.h>
41 #include <linux/vmalloc.h>
42 #include <linux/moduleparam.h>
43
44 #include <linux/blkdev.h>
45 #include "scsi.h"
46 #include <scsi/scsi_host.h>
47 #include <scsi/scsicam.h>
48
49 #include <linux/stat.h>
50
51 #include "scsi_logging.h"
52 #include "scsi_debug.h"
53
54 #define SCSI_DEBUG_VERSION "1.75"
55 static const char * scsi_debug_version_date = "20050113";
56
57 /* Additional Sense Code (ASC) used */
58 #define NO_ADDED_SENSE 0x0
59 #define UNRECOVERED_READ_ERR 0x11
60 #define INVALID_OPCODE 0x20
61 #define ADDR_OUT_OF_RANGE 0x21
62 #define INVALID_FIELD_IN_CDB 0x24
63 #define POWERON_RESET 0x29
64 #define SAVING_PARAMS_UNSUP 0x39
65 #define THRESHHOLD_EXCEEDED 0x5d
66
67 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
68
69 /* Default values for driver parameters */
70 #define DEF_NUM_HOST 1
71 #define DEF_NUM_TGTS 1
72 #define DEF_MAX_LUNS 1
73 /* With these defaults, this driver will make 1 host with 1 target
74 * (id 0) containing 1 logical unit (lun 0). That is 1 device.
75 */
76 #define DEF_DELAY 1
77 #define DEF_DEV_SIZE_MB 8
78 #define DEF_EVERY_NTH 0
79 #define DEF_NUM_PARTS 0
80 #define DEF_OPTS 0
81 #define DEF_SCSI_LEVEL 5 /* INQUIRY, byte2 [5->SPC-3] */
82 #define DEF_PTYPE 0
83 #define DEF_D_SENSE 0
84
85 /* bit mask values for scsi_debug_opts */
86 #define SCSI_DEBUG_OPT_NOISE 1
87 #define SCSI_DEBUG_OPT_MEDIUM_ERR 2
88 #define SCSI_DEBUG_OPT_TIMEOUT 4
89 #define SCSI_DEBUG_OPT_RECOVERED_ERR 8
90 /* When "every_nth" > 0 then modulo "every_nth" commands:
91 * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
92 * - a RECOVERED_ERROR is simulated on successful read and write
93 * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
94 *
95 * When "every_nth" < 0 then after "- every_nth" commands:
96 * - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
97 * - a RECOVERED_ERROR is simulated on successful read and write
98 * commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
99 * This will continue until some other action occurs (e.g. the user
100 * writing a new value (other than -1 or 1) to every_nth via sysfs).
101 */
102
103 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
104 * sector on read commands: */
105 #define OPT_MEDIUM_ERR_ADDR 0x1234 /* that's sector 4660 in decimal */
106
107 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
108 * or "peripheral device" addressing (value 0) */
109 #define SAM2_LUN_ADDRESS_METHOD 0
110
111 static int scsi_debug_add_host = DEF_NUM_HOST;
112 static int scsi_debug_delay = DEF_DELAY;
113 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
114 static int scsi_debug_every_nth = DEF_EVERY_NTH;
115 static int scsi_debug_max_luns = DEF_MAX_LUNS;
116 static int scsi_debug_num_parts = DEF_NUM_PARTS;
117 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
118 static int scsi_debug_opts = DEF_OPTS;
119 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
120 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
121 static int scsi_debug_dsense = DEF_D_SENSE;
122
123 static int scsi_debug_cmnd_count = 0;
124
125 #define DEV_READONLY(TGT) (0)
126 #define DEV_REMOVEABLE(TGT) (0)
127
128 static unsigned long sdebug_store_size; /* in bytes */
129 static sector_t sdebug_capacity; /* in sectors */
130
131 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
132 may still need them */
133 static int sdebug_heads; /* heads per disk */
134 static int sdebug_cylinders_per; /* cylinders per surface */
135 static int sdebug_sectors_per; /* sectors per cylinder */
136
137 /* default sector size is 512 bytes, 2**9 bytes */
138 #define POW2_SECT_SIZE 9
139 #define SECT_SIZE (1 << POW2_SECT_SIZE)
140 #define SECT_SIZE_PER(TGT) SECT_SIZE
141
142 #define SDEBUG_MAX_PARTS 4
143
144 #define SDEBUG_SENSE_LEN 32
145
146 struct sdebug_dev_info {
147 struct list_head dev_list;
148 unsigned char sense_buff[SDEBUG_SENSE_LEN]; /* weak nexus */
149 unsigned int channel;
150 unsigned int target;
151 unsigned int lun;
152 struct sdebug_host_info *sdbg_host;
153 char reset;
154 char used;
155 };
156
157 struct sdebug_host_info {
158 struct list_head host_list;
159 struct Scsi_Host *shost;
160 struct device dev;
161 struct list_head dev_info_list;
162 };
163
164 #define to_sdebug_host(d) \
165 container_of(d, struct sdebug_host_info, dev)
166
167 static LIST_HEAD(sdebug_host_list);
168 static DEFINE_SPINLOCK(sdebug_host_list_lock);
169
170 typedef void (* done_funct_t) (struct scsi_cmnd *);
171
172 struct sdebug_queued_cmd {
173 int in_use;
174 struct timer_list cmnd_timer;
175 done_funct_t done_funct;
176 struct scsi_cmnd * a_cmnd;
177 int scsi_result;
178 };
179 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
180
181 static struct scsi_host_template sdebug_driver_template = {
182 .proc_info = scsi_debug_proc_info,
183 .name = "SCSI DEBUG",
184 .info = scsi_debug_info,
185 .slave_alloc = scsi_debug_slave_alloc,
186 .slave_configure = scsi_debug_slave_configure,
187 .slave_destroy = scsi_debug_slave_destroy,
188 .ioctl = scsi_debug_ioctl,
189 .queuecommand = scsi_debug_queuecommand,
190 .eh_abort_handler = scsi_debug_abort,
191 .eh_bus_reset_handler = scsi_debug_bus_reset,
192 .eh_device_reset_handler = scsi_debug_device_reset,
193 .eh_host_reset_handler = scsi_debug_host_reset,
194 .bios_param = scsi_debug_biosparam,
195 .can_queue = SCSI_DEBUG_CANQUEUE,
196 .this_id = 7,
197 .sg_tablesize = 64,
198 .cmd_per_lun = 3,
199 .max_sectors = 4096,
200 .unchecked_isa_dma = 0,
201 .use_clustering = DISABLE_CLUSTERING,
202 .module = THIS_MODULE,
203 };
204
205 static unsigned char * fake_storep; /* ramdisk storage */
206
207 static int num_aborts = 0;
208 static int num_dev_resets = 0;
209 static int num_bus_resets = 0;
210 static int num_host_resets = 0;
211
212 static DEFINE_SPINLOCK(queued_arr_lock);
213 static DEFINE_RWLOCK(atomic_rw);
214
215 static char sdebug_proc_name[] = "scsi_debug";
216
217 static int sdebug_driver_probe(struct device *);
218 static int sdebug_driver_remove(struct device *);
219 static struct bus_type pseudo_lld_bus;
220
221 static struct device_driver sdebug_driverfs_driver = {
222 .name = sdebug_proc_name,
223 .bus = &pseudo_lld_bus,
224 };
225
226 static const int check_condition_result =
227 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
228
229 /* function declarations */
230 static int resp_inquiry(struct scsi_cmnd * SCpnt, int target,
231 struct sdebug_dev_info * devip);
232 static int resp_requests(struct scsi_cmnd * SCpnt,
233 struct sdebug_dev_info * devip);
234 static int resp_readcap(struct scsi_cmnd * SCpnt,
235 struct sdebug_dev_info * devip);
236 static int resp_mode_sense(struct scsi_cmnd * SCpnt, int target,
237 struct sdebug_dev_info * devip);
238 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
239 int num, struct sdebug_dev_info * devip);
240 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
241 int num, struct sdebug_dev_info * devip);
242 static int resp_report_luns(struct scsi_cmnd * SCpnt,
243 struct sdebug_dev_info * devip);
244 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
245 int arr_len);
246 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
247 int max_arr_len);
248 static void timer_intr_handler(unsigned long);
249 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev);
250 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
251 int asc, int asq);
252 static int check_reset(struct scsi_cmnd * SCpnt,
253 struct sdebug_dev_info * devip);
254 static int schedule_resp(struct scsi_cmnd * cmnd,
255 struct sdebug_dev_info * devip,
256 done_funct_t done, int scsi_result, int delta_jiff);
257 static void __init sdebug_build_parts(unsigned char * ramp);
258 static void __init init_all_queued(void);
259 static void stop_all_queued(void);
260 static int stop_queued_cmnd(struct scsi_cmnd * cmnd);
261 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
262 const char * dev_id_str, int dev_id_str_len);
263 static void do_create_driverfs_files(void);
264 static void do_remove_driverfs_files(void);
265
266 static int sdebug_add_adapter(void);
267 static void sdebug_remove_adapter(void);
268 static void sdebug_max_tgts_luns(void);
269
270 static struct device pseudo_primary;
271 static struct bus_type pseudo_lld_bus;
272
273
274 static
275 int scsi_debug_queuecommand(struct scsi_cmnd * SCpnt, done_funct_t done)
276 {
277 unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
278 int block, upper_blk, num, k;
279 int errsts = 0;
280 int target = scmd_id(SCpnt);
281 struct sdebug_dev_info * devip = NULL;
282 int inj_recovered = 0;
283
284 if (done == NULL)
285 return 0; /* assume mid level reprocessing command */
286
287 if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
288 printk(KERN_INFO "scsi_debug: cmd ");
289 for (k = 0, num = SCpnt->cmd_len; k < num; ++k)
290 printk("%02x ", (int)cmd[k]);
291 printk("\n");
292 }
293 if(target == sdebug_driver_template.this_id) {
294 printk(KERN_INFO "scsi_debug: initiator's id used as "
295 "target!\n");
296 return schedule_resp(SCpnt, NULL, done,
297 DID_NO_CONNECT << 16, 0);
298 }
299
300 if (SCpnt->device->lun >= scsi_debug_max_luns)
301 return schedule_resp(SCpnt, NULL, done,
302 DID_NO_CONNECT << 16, 0);
303 devip = devInfoReg(SCpnt->device);
304 if (NULL == devip)
305 return schedule_resp(SCpnt, NULL, done,
306 DID_NO_CONNECT << 16, 0);
307
308 if ((scsi_debug_every_nth != 0) &&
309 (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
310 scsi_debug_cmnd_count = 0;
311 if (scsi_debug_every_nth < -1)
312 scsi_debug_every_nth = -1;
313 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
314 return 0; /* ignore command causing timeout */
315 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
316 inj_recovered = 1; /* to reads and writes below */
317 }
318
319 switch (*cmd) {
320 case INQUIRY: /* mandatory, ignore unit attention */
321 errsts = resp_inquiry(SCpnt, target, devip);
322 break;
323 case REQUEST_SENSE: /* mandatory, ignore unit attention */
324 errsts = resp_requests(SCpnt, devip);
325 break;
326 case REZERO_UNIT: /* actually this is REWIND for SSC */
327 case START_STOP:
328 errsts = check_reset(SCpnt, devip);
329 break;
330 case ALLOW_MEDIUM_REMOVAL:
331 if ((errsts = check_reset(SCpnt, devip)))
332 break;
333 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
334 printk(KERN_INFO "scsi_debug: Medium removal %s\n",
335 cmd[4] ? "inhibited" : "enabled");
336 break;
337 case SEND_DIAGNOSTIC: /* mandatory */
338 errsts = check_reset(SCpnt, devip);
339 break;
340 case TEST_UNIT_READY: /* mandatory */
341 errsts = check_reset(SCpnt, devip);
342 break;
343 case RESERVE:
344 errsts = check_reset(SCpnt, devip);
345 break;
346 case RESERVE_10:
347 errsts = check_reset(SCpnt, devip);
348 break;
349 case RELEASE:
350 errsts = check_reset(SCpnt, devip);
351 break;
352 case RELEASE_10:
353 errsts = check_reset(SCpnt, devip);
354 break;
355 case READ_CAPACITY:
356 errsts = resp_readcap(SCpnt, devip);
357 break;
358 case READ_16:
359 case READ_12:
360 case READ_10:
361 case READ_6:
362 if ((errsts = check_reset(SCpnt, devip)))
363 break;
364 upper_blk = 0;
365 if ((*cmd) == READ_16) {
366 upper_blk = cmd[5] + (cmd[4] << 8) +
367 (cmd[3] << 16) + (cmd[2] << 24);
368 block = cmd[9] + (cmd[8] << 8) +
369 (cmd[7] << 16) + (cmd[6] << 24);
370 num = cmd[13] + (cmd[12] << 8) +
371 (cmd[11] << 16) + (cmd[10] << 24);
372 } else if ((*cmd) == READ_12) {
373 block = cmd[5] + (cmd[4] << 8) +
374 (cmd[3] << 16) + (cmd[2] << 24);
375 num = cmd[9] + (cmd[8] << 8) +
376 (cmd[7] << 16) + (cmd[6] << 24);
377 } else if ((*cmd) == READ_10) {
378 block = cmd[5] + (cmd[4] << 8) +
379 (cmd[3] << 16) + (cmd[2] << 24);
380 num = cmd[8] + (cmd[7] << 8);
381 } else {
382 block = cmd[3] + (cmd[2] << 8) +
383 ((cmd[1] & 0x1f) << 16);
384 num = cmd[4];
385 }
386 errsts = resp_read(SCpnt, upper_blk, block, num, devip);
387 if (inj_recovered && (0 == errsts)) {
388 mk_sense_buffer(devip, RECOVERED_ERROR,
389 THRESHHOLD_EXCEEDED, 0);
390 errsts = check_condition_result;
391 }
392 break;
393 case REPORT_LUNS: /* mandatory, ignore unit attention */
394 errsts = resp_report_luns(SCpnt, devip);
395 break;
396 case VERIFY: /* 10 byte SBC-2 command */
397 errsts = check_reset(SCpnt, devip);
398 break;
399 case WRITE_16:
400 case WRITE_12:
401 case WRITE_10:
402 case WRITE_6:
403 if ((errsts = check_reset(SCpnt, devip)))
404 break;
405 upper_blk = 0;
406 if ((*cmd) == WRITE_16) {
407 upper_blk = cmd[5] + (cmd[4] << 8) +
408 (cmd[3] << 16) + (cmd[2] << 24);
409 block = cmd[9] + (cmd[8] << 8) +
410 (cmd[7] << 16) + (cmd[6] << 24);
411 num = cmd[13] + (cmd[12] << 8) +
412 (cmd[11] << 16) + (cmd[10] << 24);
413 } else if ((*cmd) == WRITE_12) {
414 block = cmd[5] + (cmd[4] << 8) +
415 (cmd[3] << 16) + (cmd[2] << 24);
416 num = cmd[9] + (cmd[8] << 8) +
417 (cmd[7] << 16) + (cmd[6] << 24);
418 } else if ((*cmd) == WRITE_10) {
419 block = cmd[5] + (cmd[4] << 8) +
420 (cmd[3] << 16) + (cmd[2] << 24);
421 num = cmd[8] + (cmd[7] << 8);
422 } else {
423 block = cmd[3] + (cmd[2] << 8) +
424 ((cmd[1] & 0x1f) << 16);
425 num = cmd[4];
426 }
427 errsts = resp_write(SCpnt, upper_blk, block, num, devip);
428 if (inj_recovered && (0 == errsts)) {
429 mk_sense_buffer(devip, RECOVERED_ERROR,
430 THRESHHOLD_EXCEEDED, 0);
431 errsts = check_condition_result;
432 }
433 break;
434 case MODE_SENSE:
435 case MODE_SENSE_10:
436 errsts = resp_mode_sense(SCpnt, target, devip);
437 break;
438 case SYNCHRONIZE_CACHE:
439 errsts = check_reset(SCpnt, devip);
440 break;
441 default:
442 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
443 printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
444 "supported\n", *cmd);
445 if ((errsts = check_reset(SCpnt, devip)))
446 break; /* Unit attention takes precedence */
447 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
448 errsts = check_condition_result;
449 break;
450 }
451 return schedule_resp(SCpnt, devip, done, errsts, scsi_debug_delay);
452 }
453
454 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
455 {
456 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
457 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
458 }
459 return -EINVAL;
460 /* return -ENOTTY; // correct return but upsets fdisk */
461 }
462
463 static int check_reset(struct scsi_cmnd * SCpnt, struct sdebug_dev_info * devip)
464 {
465 if (devip->reset) {
466 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
467 printk(KERN_INFO "scsi_debug: Reporting Unit "
468 "attention: power on reset\n");
469 devip->reset = 0;
470 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
471 return check_condition_result;
472 }
473 return 0;
474 }
475
476 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
477 static int fill_from_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
478 int arr_len)
479 {
480 int k, req_len, act_len, len, active;
481 void * kaddr;
482 void * kaddr_off;
483 struct scatterlist * sgpnt;
484
485 if (0 == scp->request_bufflen)
486 return 0;
487 if (NULL == scp->request_buffer)
488 return (DID_ERROR << 16);
489 if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
490 (scp->sc_data_direction == DMA_FROM_DEVICE)))
491 return (DID_ERROR << 16);
492 if (0 == scp->use_sg) {
493 req_len = scp->request_bufflen;
494 act_len = (req_len < arr_len) ? req_len : arr_len;
495 memcpy(scp->request_buffer, arr, act_len);
496 scp->resid = req_len - act_len;
497 return 0;
498 }
499 sgpnt = (struct scatterlist *)scp->request_buffer;
500 active = 1;
501 for (k = 0, req_len = 0, act_len = 0; k < scp->use_sg; ++k, ++sgpnt) {
502 if (active) {
503 kaddr = (unsigned char *)
504 kmap_atomic(sgpnt->page, KM_USER0);
505 if (NULL == kaddr)
506 return (DID_ERROR << 16);
507 kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
508 len = sgpnt->length;
509 if ((req_len + len) > arr_len) {
510 active = 0;
511 len = arr_len - req_len;
512 }
513 memcpy(kaddr_off, arr + req_len, len);
514 kunmap_atomic(kaddr, KM_USER0);
515 act_len += len;
516 }
517 req_len += sgpnt->length;
518 }
519 scp->resid = req_len - act_len;
520 return 0;
521 }
522
523 /* Returns number of bytes fetched into 'arr' or -1 if error. */
524 static int fetch_to_dev_buffer(struct scsi_cmnd * scp, unsigned char * arr,
525 int max_arr_len)
526 {
527 int k, req_len, len, fin;
528 void * kaddr;
529 void * kaddr_off;
530 struct scatterlist * sgpnt;
531
532 if (0 == scp->request_bufflen)
533 return 0;
534 if (NULL == scp->request_buffer)
535 return -1;
536 if (! ((scp->sc_data_direction == DMA_BIDIRECTIONAL) ||
537 (scp->sc_data_direction == DMA_TO_DEVICE)))
538 return -1;
539 if (0 == scp->use_sg) {
540 req_len = scp->request_bufflen;
541 len = (req_len < max_arr_len) ? req_len : max_arr_len;
542 memcpy(arr, scp->request_buffer, len);
543 return len;
544 }
545 sgpnt = (struct scatterlist *)scp->request_buffer;
546 for (k = 0, req_len = 0, fin = 0; k < scp->use_sg; ++k, ++sgpnt) {
547 kaddr = (unsigned char *)kmap_atomic(sgpnt->page, KM_USER0);
548 if (NULL == kaddr)
549 return -1;
550 kaddr_off = (unsigned char *)kaddr + sgpnt->offset;
551 len = sgpnt->length;
552 if ((req_len + len) > max_arr_len) {
553 len = max_arr_len - req_len;
554 fin = 1;
555 }
556 memcpy(arr + req_len, kaddr_off, len);
557 kunmap_atomic(kaddr, KM_USER0);
558 if (fin)
559 return req_len + len;
560 req_len += sgpnt->length;
561 }
562 return req_len;
563 }
564
565
566 static const char * inq_vendor_id = "Linux ";
567 static const char * inq_product_id = "scsi_debug ";
568 static const char * inq_product_rev = "0004";
569
570 static int inquiry_evpd_83(unsigned char * arr, int dev_id_num,
571 const char * dev_id_str, int dev_id_str_len)
572 {
573 int num;
574
575 /* Two identification descriptors: */
576 /* T10 vendor identifier field format (faked) */
577 arr[0] = 0x2; /* ASCII */
578 arr[1] = 0x1;
579 arr[2] = 0x0;
580 memcpy(&arr[4], inq_vendor_id, 8);
581 memcpy(&arr[12], inq_product_id, 16);
582 memcpy(&arr[28], dev_id_str, dev_id_str_len);
583 num = 8 + 16 + dev_id_str_len;
584 arr[3] = num;
585 num += 4;
586 /* NAA IEEE registered identifier (faked) */
587 arr[num] = 0x1; /* binary */
588 arr[num + 1] = 0x3;
589 arr[num + 2] = 0x0;
590 arr[num + 3] = 0x8;
591 arr[num + 4] = 0x51; /* ieee company id=0x123456 (faked) */
592 arr[num + 5] = 0x23;
593 arr[num + 6] = 0x45;
594 arr[num + 7] = 0x60;
595 arr[num + 8] = (dev_id_num >> 24);
596 arr[num + 9] = (dev_id_num >> 16) & 0xff;
597 arr[num + 10] = (dev_id_num >> 8) & 0xff;
598 arr[num + 11] = dev_id_num & 0xff;
599 return num + 12;
600 }
601
602
603 #define SDEBUG_LONG_INQ_SZ 96
604 #define SDEBUG_MAX_INQ_ARR_SZ 128
605
606 static int resp_inquiry(struct scsi_cmnd * scp, int target,
607 struct sdebug_dev_info * devip)
608 {
609 unsigned char pq_pdt;
610 unsigned char arr[SDEBUG_MAX_INQ_ARR_SZ];
611 unsigned char *cmd = (unsigned char *)scp->cmnd;
612 int alloc_len;
613
614 alloc_len = (cmd[3] << 8) + cmd[4];
615 memset(arr, 0, SDEBUG_MAX_INQ_ARR_SZ);
616 pq_pdt = (scsi_debug_ptype & 0x1f);
617 arr[0] = pq_pdt;
618 if (0x2 & cmd[1]) { /* CMDDT bit set */
619 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
620 0);
621 return check_condition_result;
622 } else if (0x1 & cmd[1]) { /* EVPD bit set */
623 int dev_id_num, len;
624 char dev_id_str[6];
625
626 dev_id_num = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
627 (devip->target * 1000) + devip->lun;
628 len = scnprintf(dev_id_str, 6, "%d", dev_id_num);
629 if (0 == cmd[2]) { /* supported vital product data pages */
630 arr[3] = 3;
631 arr[4] = 0x0; /* this page */
632 arr[5] = 0x80; /* unit serial number */
633 arr[6] = 0x83; /* device identification */
634 } else if (0x80 == cmd[2]) { /* unit serial number */
635 arr[1] = 0x80;
636 arr[3] = len;
637 memcpy(&arr[4], dev_id_str, len);
638 } else if (0x83 == cmd[2]) { /* device identification */
639 arr[1] = 0x83;
640 arr[3] = inquiry_evpd_83(&arr[4], dev_id_num,
641 dev_id_str, len);
642 } else {
643 /* Illegal request, invalid field in cdb */
644 mk_sense_buffer(devip, ILLEGAL_REQUEST,
645 INVALID_FIELD_IN_CDB, 0);
646 return check_condition_result;
647 }
648 return fill_from_dev_buffer(scp, arr,
649 min(alloc_len, SDEBUG_MAX_INQ_ARR_SZ));
650 }
651 /* drops through here for a standard inquiry */
652 arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0; /* Removable disk */
653 arr[2] = scsi_debug_scsi_level;
654 arr[3] = 2; /* response_data_format==2 */
655 arr[4] = SDEBUG_LONG_INQ_SZ - 5;
656 arr[6] = 0x1; /* claim: ADDR16 */
657 /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
658 arr[7] = 0x3a; /* claim: WBUS16, SYNC, LINKED + CMDQUE */
659 memcpy(&arr[8], inq_vendor_id, 8);
660 memcpy(&arr[16], inq_product_id, 16);
661 memcpy(&arr[32], inq_product_rev, 4);
662 /* version descriptors (2 bytes each) follow */
663 arr[58] = 0x0; arr[59] = 0x40; /* SAM-2 */
664 arr[60] = 0x3; arr[61] = 0x0; /* SPC-3 */
665 if (scsi_debug_ptype == 0) {
666 arr[62] = 0x1; arr[63] = 0x80; /* SBC */
667 } else if (scsi_debug_ptype == 1) {
668 arr[62] = 0x2; arr[63] = 0x00; /* SSC */
669 }
670 return fill_from_dev_buffer(scp, arr,
671 min(alloc_len, SDEBUG_LONG_INQ_SZ));
672 }
673
674 static int resp_requests(struct scsi_cmnd * scp,
675 struct sdebug_dev_info * devip)
676 {
677 unsigned char * sbuff;
678 unsigned char *cmd = (unsigned char *)scp->cmnd;
679 unsigned char arr[SDEBUG_SENSE_LEN];
680 int len = 18;
681
682 memset(arr, 0, SDEBUG_SENSE_LEN);
683 if (devip->reset == 1)
684 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0);
685 sbuff = devip->sense_buff;
686 if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
687 /* DESC bit set and sense_buff in fixed format */
688 arr[0] = 0x72;
689 arr[1] = sbuff[2]; /* sense key */
690 arr[2] = sbuff[12]; /* asc */
691 arr[3] = sbuff[13]; /* ascq */
692 len = 8;
693 } else
694 memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
695 mk_sense_buffer(devip, 0, NO_ADDED_SENSE, 0);
696 return fill_from_dev_buffer(scp, arr, len);
697 }
698
699 #define SDEBUG_READCAP_ARR_SZ 8
700 static int resp_readcap(struct scsi_cmnd * scp,
701 struct sdebug_dev_info * devip)
702 {
703 unsigned char arr[SDEBUG_READCAP_ARR_SZ];
704 unsigned long capac;
705 int errsts;
706
707 if ((errsts = check_reset(scp, devip)))
708 return errsts;
709 memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
710 capac = (unsigned long)sdebug_capacity - 1;
711 arr[0] = (capac >> 24);
712 arr[1] = (capac >> 16) & 0xff;
713 arr[2] = (capac >> 8) & 0xff;
714 arr[3] = capac & 0xff;
715 arr[6] = (SECT_SIZE_PER(target) >> 8) & 0xff;
716 arr[7] = SECT_SIZE_PER(target) & 0xff;
717 return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
718 }
719
720 /* <<Following mode page info copied from ST318451LW>> */
721
722 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
723 { /* Read-Write Error Recovery page for mode_sense */
724 unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
725 5, 0, 0xff, 0xff};
726
727 memcpy(p, err_recov_pg, sizeof(err_recov_pg));
728 if (1 == pcontrol)
729 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
730 return sizeof(err_recov_pg);
731 }
732
733 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
734 { /* Disconnect-Reconnect page for mode_sense */
735 unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
736 0, 0, 0, 0, 0, 0, 0, 0};
737
738 memcpy(p, disconnect_pg, sizeof(disconnect_pg));
739 if (1 == pcontrol)
740 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
741 return sizeof(disconnect_pg);
742 }
743
744 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
745 { /* Format device page for mode_sense */
746 unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
747 0, 0, 0, 0, 0, 0, 0, 0,
748 0, 0, 0, 0, 0x40, 0, 0, 0};
749
750 memcpy(p, format_pg, sizeof(format_pg));
751 p[10] = (sdebug_sectors_per >> 8) & 0xff;
752 p[11] = sdebug_sectors_per & 0xff;
753 p[12] = (SECT_SIZE >> 8) & 0xff;
754 p[13] = SECT_SIZE & 0xff;
755 if (DEV_REMOVEABLE(target))
756 p[20] |= 0x20; /* should agree with INQUIRY */
757 if (1 == pcontrol)
758 memset(p + 2, 0, sizeof(format_pg) - 2);
759 return sizeof(format_pg);
760 }
761
762 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
763 { /* Caching page for mode_sense */
764 unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
765 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0, 0, 0, 0, 0};
766
767 memcpy(p, caching_pg, sizeof(caching_pg));
768 if (1 == pcontrol)
769 memset(p + 2, 0, sizeof(caching_pg) - 2);
770 return sizeof(caching_pg);
771 }
772
773 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
774 { /* Control mode page for mode_sense */
775 unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
776 0, 0, 0x2, 0x4b};
777
778 if (scsi_debug_dsense)
779 ctrl_m_pg[2] |= 0x4;
780 memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
781 if (1 == pcontrol)
782 memset(p + 2, 0, sizeof(ctrl_m_pg) - 2);
783 return sizeof(ctrl_m_pg);
784 }
785
786 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
787 { /* Informational Exceptions control mode page for mode_sense */
788 unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
789 0, 0, 0x0, 0x0};
790 memcpy(p, iec_m_pg, sizeof(iec_m_pg));
791 if (1 == pcontrol)
792 memset(p + 2, 0, sizeof(iec_m_pg) - 2);
793 return sizeof(iec_m_pg);
794 }
795
796 #define SDEBUG_MAX_MSENSE_SZ 256
797
798 static int resp_mode_sense(struct scsi_cmnd * scp, int target,
799 struct sdebug_dev_info * devip)
800 {
801 unsigned char dbd;
802 int pcontrol, pcode, subpcode;
803 unsigned char dev_spec;
804 int alloc_len, msense_6, offset, len, errsts;
805 unsigned char * ap;
806 unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
807 unsigned char *cmd = (unsigned char *)scp->cmnd;
808
809 if ((errsts = check_reset(scp, devip)))
810 return errsts;
811 dbd = cmd[1] & 0x8;
812 pcontrol = (cmd[2] & 0xc0) >> 6;
813 pcode = cmd[2] & 0x3f;
814 subpcode = cmd[3];
815 msense_6 = (MODE_SENSE == cmd[0]);
816 alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
817 memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
818 if (0x3 == pcontrol) { /* Saving values not supported */
819 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
820 0);
821 return check_condition_result;
822 }
823 dev_spec = DEV_READONLY(target) ? 0x80 : 0x0;
824 if (msense_6) {
825 arr[2] = dev_spec;
826 offset = 4;
827 } else {
828 arr[3] = dev_spec;
829 offset = 8;
830 }
831 ap = arr + offset;
832
833 if (0 != subpcode) { /* TODO: Control Extension page */
834 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
835 0);
836 return check_condition_result;
837 }
838 switch (pcode) {
839 case 0x1: /* Read-Write error recovery page, direct access */
840 len = resp_err_recov_pg(ap, pcontrol, target);
841 offset += len;
842 break;
843 case 0x2: /* Disconnect-Reconnect page, all devices */
844 len = resp_disconnect_pg(ap, pcontrol, target);
845 offset += len;
846 break;
847 case 0x3: /* Format device page, direct access */
848 len = resp_format_pg(ap, pcontrol, target);
849 offset += len;
850 break;
851 case 0x8: /* Caching page, direct access */
852 len = resp_caching_pg(ap, pcontrol, target);
853 offset += len;
854 break;
855 case 0xa: /* Control Mode page, all devices */
856 len = resp_ctrl_m_pg(ap, pcontrol, target);
857 offset += len;
858 break;
859 case 0x1c: /* Informational Exceptions Mode page, all devices */
860 len = resp_iec_m_pg(ap, pcontrol, target);
861 offset += len;
862 break;
863 case 0x3f: /* Read all Mode pages */
864 len = resp_err_recov_pg(ap, pcontrol, target);
865 len += resp_disconnect_pg(ap + len, pcontrol, target);
866 len += resp_format_pg(ap + len, pcontrol, target);
867 len += resp_caching_pg(ap + len, pcontrol, target);
868 len += resp_ctrl_m_pg(ap + len, pcontrol, target);
869 len += resp_iec_m_pg(ap + len, pcontrol, target);
870 offset += len;
871 break;
872 default:
873 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
874 0);
875 return check_condition_result;
876 }
877 if (msense_6)
878 arr[0] = offset - 1;
879 else {
880 arr[0] = ((offset - 2) >> 8) & 0xff;
881 arr[1] = (offset - 2) & 0xff;
882 }
883 return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
884 }
885
886 static int resp_read(struct scsi_cmnd * SCpnt, int upper_blk, int block,
887 int num, struct sdebug_dev_info * devip)
888 {
889 unsigned long iflags;
890 int ret;
891
892 if (upper_blk || (block + num > sdebug_capacity)) {
893 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
894 0);
895 return check_condition_result;
896 }
897 if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
898 (block <= OPT_MEDIUM_ERR_ADDR) &&
899 ((block + num) > OPT_MEDIUM_ERR_ADDR)) {
900 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR,
901 0);
902 /* claim unrecoverable read error */
903 return check_condition_result;
904 }
905 read_lock_irqsave(&atomic_rw, iflags);
906 ret = fill_from_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE),
907 num * SECT_SIZE);
908 read_unlock_irqrestore(&atomic_rw, iflags);
909 return ret;
910 }
911
912 static int resp_write(struct scsi_cmnd * SCpnt, int upper_blk, int block,
913 int num, struct sdebug_dev_info * devip)
914 {
915 unsigned long iflags;
916 int res;
917
918 if (upper_blk || (block + num > sdebug_capacity)) {
919 mk_sense_buffer(devip, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE,
920 0);
921 return check_condition_result;
922 }
923
924 write_lock_irqsave(&atomic_rw, iflags);
925 res = fetch_to_dev_buffer(SCpnt, fake_storep + (block * SECT_SIZE),
926 num * SECT_SIZE);
927 write_unlock_irqrestore(&atomic_rw, iflags);
928 if (-1 == res)
929 return (DID_ERROR << 16);
930 else if ((res < (num * SECT_SIZE)) &&
931 (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
932 printk(KERN_INFO "scsi_debug: write: cdb indicated=%d, "
933 " IO sent=%d bytes\n", num * SECT_SIZE, res);
934 return 0;
935 }
936
937 #define SDEBUG_RLUN_ARR_SZ 128
938
939 static int resp_report_luns(struct scsi_cmnd * scp,
940 struct sdebug_dev_info * devip)
941 {
942 unsigned int alloc_len;
943 int lun_cnt, i, upper;
944 unsigned char *cmd = (unsigned char *)scp->cmnd;
945 int select_report = (int)cmd[2];
946 struct scsi_lun *one_lun;
947 unsigned char arr[SDEBUG_RLUN_ARR_SZ];
948
949 alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
950 if ((alloc_len < 16) || (select_report > 2)) {
951 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
952 0);
953 return check_condition_result;
954 }
955 /* can produce response with up to 16k luns (lun 0 to lun 16383) */
956 memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
957 lun_cnt = scsi_debug_max_luns;
958 arr[2] = ((sizeof(struct scsi_lun) * lun_cnt) >> 8) & 0xff;
959 arr[3] = (sizeof(struct scsi_lun) * lun_cnt) & 0xff;
960 lun_cnt = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
961 sizeof(struct scsi_lun)), lun_cnt);
962 one_lun = (struct scsi_lun *) &arr[8];
963 for (i = 0; i < lun_cnt; i++) {
964 upper = (i >> 8) & 0x3f;
965 if (upper)
966 one_lun[i].scsi_lun[0] =
967 (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
968 one_lun[i].scsi_lun[1] = i & 0xff;
969 }
970 return fill_from_dev_buffer(scp, arr,
971 min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
972 }
973
974 /* When timer goes off this function is called. */
975 static void timer_intr_handler(unsigned long indx)
976 {
977 struct sdebug_queued_cmd * sqcp;
978 unsigned long iflags;
979
980 if (indx >= SCSI_DEBUG_CANQUEUE) {
981 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
982 "large\n");
983 return;
984 }
985 spin_lock_irqsave(&queued_arr_lock, iflags);
986 sqcp = &queued_arr[(int)indx];
987 if (! sqcp->in_use) {
988 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
989 "interrupt\n");
990 spin_unlock_irqrestore(&queued_arr_lock, iflags);
991 return;
992 }
993 sqcp->in_use = 0;
994 if (sqcp->done_funct) {
995 sqcp->a_cmnd->result = sqcp->scsi_result;
996 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
997 }
998 sqcp->done_funct = NULL;
999 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1000 }
1001
1002 static int scsi_debug_slave_alloc(struct scsi_device * sdp)
1003 {
1004 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1005 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_alloc\n");
1006 return 0;
1007 }
1008
1009 static int scsi_debug_slave_configure(struct scsi_device * sdp)
1010 {
1011 struct sdebug_dev_info * devip;
1012
1013 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1014 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_configure\n");
1015 if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
1016 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
1017 devip = devInfoReg(sdp);
1018 sdp->hostdata = devip;
1019 if (sdp->host->cmd_per_lun)
1020 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
1021 sdp->host->cmd_per_lun);
1022 return 0;
1023 }
1024
1025 static void scsi_debug_slave_destroy(struct scsi_device * sdp)
1026 {
1027 struct sdebug_dev_info * devip =
1028 (struct sdebug_dev_info *)sdp->hostdata;
1029
1030 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1031 sdev_printk(KERN_INFO, sdp, "scsi_debug: slave_destroy\n");
1032 if (devip) {
1033 /* make this slot avaliable for re-use */
1034 devip->used = 0;
1035 sdp->hostdata = NULL;
1036 }
1037 }
1038
1039 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
1040 {
1041 struct sdebug_host_info * sdbg_host;
1042 struct sdebug_dev_info * open_devip = NULL;
1043 struct sdebug_dev_info * devip =
1044 (struct sdebug_dev_info *)sdev->hostdata;
1045
1046 if (devip)
1047 return devip;
1048 sdbg_host = *(struct sdebug_host_info **) sdev->host->hostdata;
1049 if(! sdbg_host) {
1050 printk(KERN_ERR "Host info NULL\n");
1051 return NULL;
1052 }
1053 list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
1054 if ((devip->used) && (devip->channel == sdev->channel) &&
1055 (devip->target == sdev->id) &&
1056 (devip->lun == sdev->lun))
1057 return devip;
1058 else {
1059 if ((!devip->used) && (!open_devip))
1060 open_devip = devip;
1061 }
1062 }
1063 if (NULL == open_devip) { /* try and make a new one */
1064 open_devip = kzalloc(sizeof(*open_devip),GFP_KERNEL);
1065 if (NULL == open_devip) {
1066 printk(KERN_ERR "%s: out of memory at line %d\n",
1067 __FUNCTION__, __LINE__);
1068 return NULL;
1069 }
1070 open_devip->sdbg_host = sdbg_host;
1071 list_add_tail(&open_devip->dev_list,
1072 &sdbg_host->dev_info_list);
1073 }
1074 if (open_devip) {
1075 open_devip->channel = sdev->channel;
1076 open_devip->target = sdev->id;
1077 open_devip->lun = sdev->lun;
1078 open_devip->sdbg_host = sdbg_host;
1079 open_devip->reset = 1;
1080 open_devip->used = 1;
1081 memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
1082 if (scsi_debug_dsense)
1083 open_devip->sense_buff[0] = 0x72;
1084 else {
1085 open_devip->sense_buff[0] = 0x70;
1086 open_devip->sense_buff[7] = 0xa;
1087 }
1088 return open_devip;
1089 }
1090 return NULL;
1091 }
1092
1093 static void mk_sense_buffer(struct sdebug_dev_info * devip, int key,
1094 int asc, int asq)
1095 {
1096 unsigned char * sbuff;
1097
1098 sbuff = devip->sense_buff;
1099 memset(sbuff, 0, SDEBUG_SENSE_LEN);
1100 if (scsi_debug_dsense) {
1101 sbuff[0] = 0x72; /* descriptor, current */
1102 sbuff[1] = key;
1103 sbuff[2] = asc;
1104 sbuff[3] = asq;
1105 } else {
1106 sbuff[0] = 0x70; /* fixed, current */
1107 sbuff[2] = key;
1108 sbuff[7] = 0xa; /* implies 18 byte sense buffer */
1109 sbuff[12] = asc;
1110 sbuff[13] = asq;
1111 }
1112 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1113 printk(KERN_INFO "scsi_debug: [sense_key,asc,ascq]: "
1114 "[0x%x,0x%x,0x%x]\n", key, asc, asq);
1115 }
1116
1117 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
1118 {
1119 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1120 printk(KERN_INFO "scsi_debug: abort\n");
1121 ++num_aborts;
1122 stop_queued_cmnd(SCpnt);
1123 return SUCCESS;
1124 }
1125
1126 static int scsi_debug_biosparam(struct scsi_device *sdev,
1127 struct block_device * bdev, sector_t capacity, int *info)
1128 {
1129 int res;
1130 unsigned char *buf;
1131
1132 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1133 printk(KERN_INFO "scsi_debug: biosparam\n");
1134 buf = scsi_bios_ptable(bdev);
1135 if (buf) {
1136 res = scsi_partsize(buf, capacity,
1137 &info[2], &info[0], &info[1]);
1138 kfree(buf);
1139 if (! res)
1140 return res;
1141 }
1142 info[0] = sdebug_heads;
1143 info[1] = sdebug_sectors_per;
1144 info[2] = sdebug_cylinders_per;
1145 return 0;
1146 }
1147
1148 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
1149 {
1150 struct sdebug_dev_info * devip;
1151
1152 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1153 printk(KERN_INFO "scsi_debug: device_reset\n");
1154 ++num_dev_resets;
1155 if (SCpnt) {
1156 devip = devInfoReg(SCpnt->device);
1157 if (devip)
1158 devip->reset = 1;
1159 }
1160 return SUCCESS;
1161 }
1162
1163 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
1164 {
1165 struct sdebug_host_info *sdbg_host;
1166 struct sdebug_dev_info * dev_info;
1167 struct scsi_device * sdp;
1168 struct Scsi_Host * hp;
1169
1170 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1171 printk(KERN_INFO "scsi_debug: bus_reset\n");
1172 ++num_bus_resets;
1173 if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
1174 sdbg_host = *(struct sdebug_host_info **) hp->hostdata;
1175 if (sdbg_host) {
1176 list_for_each_entry(dev_info,
1177 &sdbg_host->dev_info_list,
1178 dev_list)
1179 dev_info->reset = 1;
1180 }
1181 }
1182 return SUCCESS;
1183 }
1184
1185 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
1186 {
1187 struct sdebug_host_info * sdbg_host;
1188 struct sdebug_dev_info * dev_info;
1189
1190 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1191 printk(KERN_INFO "scsi_debug: host_reset\n");
1192 ++num_host_resets;
1193 spin_lock(&sdebug_host_list_lock);
1194 list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1195 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
1196 dev_list)
1197 dev_info->reset = 1;
1198 }
1199 spin_unlock(&sdebug_host_list_lock);
1200 stop_all_queued();
1201 return SUCCESS;
1202 }
1203
1204 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
1205 static int stop_queued_cmnd(struct scsi_cmnd * cmnd)
1206 {
1207 unsigned long iflags;
1208 int k;
1209 struct sdebug_queued_cmd * sqcp;
1210
1211 spin_lock_irqsave(&queued_arr_lock, iflags);
1212 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1213 sqcp = &queued_arr[k];
1214 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
1215 del_timer_sync(&sqcp->cmnd_timer);
1216 sqcp->in_use = 0;
1217 sqcp->a_cmnd = NULL;
1218 break;
1219 }
1220 }
1221 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1222 return (k < SCSI_DEBUG_CANQUEUE) ? 1 : 0;
1223 }
1224
1225 /* Deletes (stops) timers of all queued commands */
1226 static void stop_all_queued(void)
1227 {
1228 unsigned long iflags;
1229 int k;
1230 struct sdebug_queued_cmd * sqcp;
1231
1232 spin_lock_irqsave(&queued_arr_lock, iflags);
1233 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1234 sqcp = &queued_arr[k];
1235 if (sqcp->in_use && sqcp->a_cmnd) {
1236 del_timer_sync(&sqcp->cmnd_timer);
1237 sqcp->in_use = 0;
1238 sqcp->a_cmnd = NULL;
1239 }
1240 }
1241 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1242 }
1243
1244 /* Initializes timers in queued array */
1245 static void __init init_all_queued(void)
1246 {
1247 unsigned long iflags;
1248 int k;
1249 struct sdebug_queued_cmd * sqcp;
1250
1251 spin_lock_irqsave(&queued_arr_lock, iflags);
1252 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1253 sqcp = &queued_arr[k];
1254 init_timer(&sqcp->cmnd_timer);
1255 sqcp->in_use = 0;
1256 sqcp->a_cmnd = NULL;
1257 }
1258 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1259 }
1260
1261 static void __init sdebug_build_parts(unsigned char * ramp)
1262 {
1263 struct partition * pp;
1264 int starts[SDEBUG_MAX_PARTS + 2];
1265 int sectors_per_part, num_sectors, k;
1266 int heads_by_sects, start_sec, end_sec;
1267
1268 /* assume partition table already zeroed */
1269 if ((scsi_debug_num_parts < 1) || (sdebug_store_size < 1048576))
1270 return;
1271 if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
1272 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
1273 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
1274 "partitions to %d\n", SDEBUG_MAX_PARTS);
1275 }
1276 num_sectors = (int)(sdebug_store_size / SECT_SIZE);
1277 sectors_per_part = (num_sectors - sdebug_sectors_per)
1278 / scsi_debug_num_parts;
1279 heads_by_sects = sdebug_heads * sdebug_sectors_per;
1280 starts[0] = sdebug_sectors_per;
1281 for (k = 1; k < scsi_debug_num_parts; ++k)
1282 starts[k] = ((k * sectors_per_part) / heads_by_sects)
1283 * heads_by_sects;
1284 starts[scsi_debug_num_parts] = num_sectors;
1285 starts[scsi_debug_num_parts + 1] = 0;
1286
1287 ramp[510] = 0x55; /* magic partition markings */
1288 ramp[511] = 0xAA;
1289 pp = (struct partition *)(ramp + 0x1be);
1290 for (k = 0; starts[k + 1]; ++k, ++pp) {
1291 start_sec = starts[k];
1292 end_sec = starts[k + 1] - 1;
1293 pp->boot_ind = 0;
1294
1295 pp->cyl = start_sec / heads_by_sects;
1296 pp->head = (start_sec - (pp->cyl * heads_by_sects))
1297 / sdebug_sectors_per;
1298 pp->sector = (start_sec % sdebug_sectors_per) + 1;
1299
1300 pp->end_cyl = end_sec / heads_by_sects;
1301 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
1302 / sdebug_sectors_per;
1303 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
1304
1305 pp->start_sect = start_sec;
1306 pp->nr_sects = end_sec - start_sec + 1;
1307 pp->sys_ind = 0x83; /* plain Linux partition */
1308 }
1309 }
1310
1311 static int schedule_resp(struct scsi_cmnd * cmnd,
1312 struct sdebug_dev_info * devip,
1313 done_funct_t done, int scsi_result, int delta_jiff)
1314 {
1315 if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
1316 if (scsi_result) {
1317 struct scsi_device * sdp = cmnd->device;
1318
1319 sdev_printk(KERN_INFO, sdp,
1320 "non-zero result=0x%x\n",
1321 scsi_result);
1322 }
1323 }
1324 if (cmnd && devip) {
1325 /* simulate autosense by this driver */
1326 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
1327 memcpy(cmnd->sense_buffer, devip->sense_buff,
1328 (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
1329 SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
1330 }
1331 if (delta_jiff <= 0) {
1332 if (cmnd)
1333 cmnd->result = scsi_result;
1334 if (done)
1335 done(cmnd);
1336 return 0;
1337 } else {
1338 unsigned long iflags;
1339 int k;
1340 struct sdebug_queued_cmd * sqcp = NULL;
1341
1342 spin_lock_irqsave(&queued_arr_lock, iflags);
1343 for (k = 0; k < SCSI_DEBUG_CANQUEUE; ++k) {
1344 sqcp = &queued_arr[k];
1345 if (! sqcp->in_use)
1346 break;
1347 }
1348 if (k >= SCSI_DEBUG_CANQUEUE) {
1349 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1350 printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
1351 return 1; /* report busy to mid level */
1352 }
1353 sqcp->in_use = 1;
1354 sqcp->a_cmnd = cmnd;
1355 sqcp->scsi_result = scsi_result;
1356 sqcp->done_funct = done;
1357 sqcp->cmnd_timer.function = timer_intr_handler;
1358 sqcp->cmnd_timer.data = k;
1359 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
1360 add_timer(&sqcp->cmnd_timer);
1361 spin_unlock_irqrestore(&queued_arr_lock, iflags);
1362 if (cmnd)
1363 cmnd->result = 0;
1364 return 0;
1365 }
1366 }
1367
1368 /* Set 'perm' (4th argument) to 0 to disable module_param's definition
1369 * of sysfs parameters (which module_param doesn't yet support).
1370 * Sysfs parameters defined explicitly below.
1371 */
1372 module_param_named(add_host, scsi_debug_add_host, int, 0); /* perm=0644 */
1373 module_param_named(delay, scsi_debug_delay, int, 0); /* perm=0644 */
1374 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, 0);
1375 module_param_named(dsense, scsi_debug_dsense, int, 0);
1376 module_param_named(every_nth, scsi_debug_every_nth, int, 0);
1377 module_param_named(max_luns, scsi_debug_max_luns, int, 0);
1378 module_param_named(num_parts, scsi_debug_num_parts, int, 0);
1379 module_param_named(num_tgts, scsi_debug_num_tgts, int, 0);
1380 module_param_named(opts, scsi_debug_opts, int, 0); /* perm=0644 */
1381 module_param_named(ptype, scsi_debug_ptype, int, 0);
1382 module_param_named(scsi_level, scsi_debug_scsi_level, int, 0);
1383
1384 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
1385 MODULE_DESCRIPTION("SCSI debug adapter driver");
1386 MODULE_LICENSE("GPL");
1387 MODULE_VERSION(SCSI_DEBUG_VERSION);
1388
1389 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
1390 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
1391 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs");
1392 MODULE_PARM_DESC(dsense, "use descriptor sense format(def: fixed)");
1393 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=100)");
1394 MODULE_PARM_DESC(max_luns, "number of SCSI LUNs per target to simulate");
1395 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
1396 MODULE_PARM_DESC(num_tgts, "number of SCSI targets per host to simulate");
1397 MODULE_PARM_DESC(opts, "1->noise, 2->medium_error, 4->...");
1398 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
1399 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
1400
1401
1402 static char sdebug_info[256];
1403
1404 static const char * scsi_debug_info(struct Scsi_Host * shp)
1405 {
1406 sprintf(sdebug_info, "scsi_debug, version %s [%s], "
1407 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
1408 scsi_debug_version_date, scsi_debug_dev_size_mb,
1409 scsi_debug_opts);
1410 return sdebug_info;
1411 }
1412
1413 /* scsi_debug_proc_info
1414 * Used if the driver currently has no own support for /proc/scsi
1415 */
1416 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
1417 int length, int inout)
1418 {
1419 int len, pos, begin;
1420 int orig_length;
1421
1422 orig_length = length;
1423
1424 if (inout == 1) {
1425 char arr[16];
1426 int minLen = length > 15 ? 15 : length;
1427
1428 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
1429 return -EACCES;
1430 memcpy(arr, buffer, minLen);
1431 arr[minLen] = '\0';
1432 if (1 != sscanf(arr, "%d", &pos))
1433 return -EINVAL;
1434 scsi_debug_opts = pos;
1435 if (scsi_debug_every_nth != 0)
1436 scsi_debug_cmnd_count = 0;
1437 return length;
1438 }
1439 begin = 0;
1440 pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
1441 "%s [%s]\n"
1442 "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
1443 "every_nth=%d(curr:%d)\n"
1444 "delay=%d, max_luns=%d, scsi_level=%d\n"
1445 "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
1446 "number of aborts=%d, device_reset=%d, bus_resets=%d, "
1447 "host_resets=%d\n",
1448 SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
1449 scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
1450 scsi_debug_cmnd_count, scsi_debug_delay,
1451 scsi_debug_max_luns, scsi_debug_scsi_level,
1452 SECT_SIZE, sdebug_cylinders_per, sdebug_heads, sdebug_sectors_per,
1453 num_aborts, num_dev_resets, num_bus_resets, num_host_resets);
1454 if (pos < offset) {
1455 len = 0;
1456 begin = pos;
1457 }
1458 *start = buffer + (offset - begin); /* Start of wanted data */
1459 len -= (offset - begin);
1460 if (len > length)
1461 len = length;
1462 return len;
1463 }
1464
1465 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
1466 {
1467 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
1468 }
1469
1470 static ssize_t sdebug_delay_store(struct device_driver * ddp,
1471 const char * buf, size_t count)
1472 {
1473 int delay;
1474 char work[20];
1475
1476 if (1 == sscanf(buf, "%10s", work)) {
1477 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
1478 scsi_debug_delay = delay;
1479 return count;
1480 }
1481 }
1482 return -EINVAL;
1483 }
1484 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
1485 sdebug_delay_store);
1486
1487 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
1488 {
1489 return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
1490 }
1491
1492 static ssize_t sdebug_opts_store(struct device_driver * ddp,
1493 const char * buf, size_t count)
1494 {
1495 int opts;
1496 char work[20];
1497
1498 if (1 == sscanf(buf, "%10s", work)) {
1499 if (0 == strnicmp(work,"0x", 2)) {
1500 if (1 == sscanf(&work[2], "%x", &opts))
1501 goto opts_done;
1502 } else {
1503 if (1 == sscanf(work, "%d", &opts))
1504 goto opts_done;
1505 }
1506 }
1507 return -EINVAL;
1508 opts_done:
1509 scsi_debug_opts = opts;
1510 scsi_debug_cmnd_count = 0;
1511 return count;
1512 }
1513 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
1514 sdebug_opts_store);
1515
1516 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
1517 {
1518 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
1519 }
1520 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
1521 const char * buf, size_t count)
1522 {
1523 int n;
1524
1525 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1526 scsi_debug_ptype = n;
1527 return count;
1528 }
1529 return -EINVAL;
1530 }
1531 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
1532
1533 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
1534 {
1535 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
1536 }
1537 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
1538 const char * buf, size_t count)
1539 {
1540 int n;
1541
1542 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1543 scsi_debug_dsense = n;
1544 return count;
1545 }
1546 return -EINVAL;
1547 }
1548 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
1549 sdebug_dsense_store);
1550
1551 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
1552 {
1553 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
1554 }
1555 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
1556 const char * buf, size_t count)
1557 {
1558 int n;
1559
1560 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1561 scsi_debug_num_tgts = n;
1562 sdebug_max_tgts_luns();
1563 return count;
1564 }
1565 return -EINVAL;
1566 }
1567 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
1568 sdebug_num_tgts_store);
1569
1570 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
1571 {
1572 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
1573 }
1574 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
1575
1576 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
1577 {
1578 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
1579 }
1580 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
1581
1582 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
1583 {
1584 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
1585 }
1586 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
1587 const char * buf, size_t count)
1588 {
1589 int nth;
1590
1591 if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
1592 scsi_debug_every_nth = nth;
1593 scsi_debug_cmnd_count = 0;
1594 return count;
1595 }
1596 return -EINVAL;
1597 }
1598 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
1599 sdebug_every_nth_store);
1600
1601 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
1602 {
1603 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
1604 }
1605 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
1606 const char * buf, size_t count)
1607 {
1608 int n;
1609
1610 if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
1611 scsi_debug_max_luns = n;
1612 sdebug_max_tgts_luns();
1613 return count;
1614 }
1615 return -EINVAL;
1616 }
1617 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
1618 sdebug_max_luns_store);
1619
1620 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
1621 {
1622 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
1623 }
1624 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
1625
1626 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
1627 {
1628 return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
1629 }
1630
1631 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
1632 const char * buf, size_t count)
1633 {
1634 int delta_hosts;
1635 char work[20];
1636
1637 if (1 != sscanf(buf, "%10s", work))
1638 return -EINVAL;
1639 { /* temporary hack around sscanf() problem with -ve nums */
1640 int neg = 0;
1641
1642 if ('-' == *work)
1643 neg = 1;
1644 if (1 != sscanf(work + neg, "%d", &delta_hosts))
1645 return -EINVAL;
1646 if (neg)
1647 delta_hosts = -delta_hosts;
1648 }
1649 if (delta_hosts > 0) {
1650 do {
1651 sdebug_add_adapter();
1652 } while (--delta_hosts);
1653 } else if (delta_hosts < 0) {
1654 do {
1655 sdebug_remove_adapter();
1656 } while (++delta_hosts);
1657 }
1658 return count;
1659 }
1660 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
1661 sdebug_add_host_store);
1662
1663 static void do_create_driverfs_files(void)
1664 {
1665 driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1666 driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
1667 driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1668 driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
1669 driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1670 driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1671 driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1672 driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
1673 driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
1674 driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
1675 driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1676 }
1677
1678 static void do_remove_driverfs_files(void)
1679 {
1680 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
1681 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
1682 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
1683 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
1684 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
1685 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
1686 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
1687 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
1688 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
1689 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
1690 driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
1691 }
1692
1693 static int __init scsi_debug_init(void)
1694 {
1695 unsigned long sz;
1696 int host_to_add;
1697 int k;
1698
1699 if (scsi_debug_dev_size_mb < 1)
1700 scsi_debug_dev_size_mb = 1; /* force minimum 1 MB ramdisk */
1701 sdebug_store_size = (unsigned long)scsi_debug_dev_size_mb * 1048576;
1702 sdebug_capacity = sdebug_store_size / SECT_SIZE;
1703
1704 /* play around with geometry, don't waste too much on track 0 */
1705 sdebug_heads = 8;
1706 sdebug_sectors_per = 32;
1707 if (scsi_debug_dev_size_mb >= 16)
1708 sdebug_heads = 32;
1709 else if (scsi_debug_dev_size_mb >= 256)
1710 sdebug_heads = 64;
1711 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1712 (sdebug_sectors_per * sdebug_heads);
1713 if (sdebug_cylinders_per >= 1024) {
1714 /* other LLDs do this; implies >= 1GB ram disk ... */
1715 sdebug_heads = 255;
1716 sdebug_sectors_per = 63;
1717 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
1718 (sdebug_sectors_per * sdebug_heads);
1719 }
1720
1721 sz = sdebug_store_size;
1722 fake_storep = vmalloc(sz);
1723 if (NULL == fake_storep) {
1724 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
1725 return -ENOMEM;
1726 }
1727 memset(fake_storep, 0, sz);
1728 if (scsi_debug_num_parts > 0)
1729 sdebug_build_parts(fake_storep);
1730
1731 init_all_queued();
1732
1733 device_register(&pseudo_primary);
1734 bus_register(&pseudo_lld_bus);
1735 driver_register(&sdebug_driverfs_driver);
1736 do_create_driverfs_files();
1737
1738 sdebug_driver_template.proc_name = (char *)sdebug_proc_name;
1739
1740 host_to_add = scsi_debug_add_host;
1741 scsi_debug_add_host = 0;
1742
1743 for (k = 0; k < host_to_add; k++) {
1744 if (sdebug_add_adapter()) {
1745 printk(KERN_ERR "scsi_debug_init: "
1746 "sdebug_add_adapter failed k=%d\n", k);
1747 break;
1748 }
1749 }
1750
1751 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
1752 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
1753 scsi_debug_add_host);
1754 }
1755 return 0;
1756 }
1757
1758 static void __exit scsi_debug_exit(void)
1759 {
1760 int k = scsi_debug_add_host;
1761
1762 stop_all_queued();
1763 for (; k; k--)
1764 sdebug_remove_adapter();
1765 do_remove_driverfs_files();
1766 driver_unregister(&sdebug_driverfs_driver);
1767 bus_unregister(&pseudo_lld_bus);
1768 device_unregister(&pseudo_primary);
1769
1770 vfree(fake_storep);
1771 }
1772
1773 device_initcall(scsi_debug_init);
1774 module_exit(scsi_debug_exit);
1775
1776 static void pseudo_0_release(struct device * dev)
1777 {
1778 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
1779 printk(KERN_INFO "scsi_debug: pseudo_0_release() called\n");
1780 }
1781
1782 static struct device pseudo_primary = {
1783 .bus_id = "pseudo_0",
1784 .release = pseudo_0_release,
1785 };
1786
1787 static int pseudo_lld_bus_match(struct device *dev,
1788 struct device_driver *dev_driver)
1789 {
1790 return 1;
1791 }
1792
1793 static struct bus_type pseudo_lld_bus = {
1794 .name = "pseudo",
1795 .match = pseudo_lld_bus_match,
1796 .probe = sdebug_driver_probe,
1797 .remove = sdebug_driver_remove,
1798 };
1799
1800 static void sdebug_release_adapter(struct device * dev)
1801 {
1802 struct sdebug_host_info *sdbg_host;
1803
1804 sdbg_host = to_sdebug_host(dev);
1805 kfree(sdbg_host);
1806 }
1807
1808 static int sdebug_add_adapter(void)
1809 {
1810 int k, devs_per_host;
1811 int error = 0;
1812 struct sdebug_host_info *sdbg_host;
1813 struct sdebug_dev_info *sdbg_devinfo;
1814 struct list_head *lh, *lh_sf;
1815
1816 sdbg_host = kzalloc(sizeof(*sdbg_host), GFP_KERNEL);
1817
1818 if (NULL == sdbg_host) {
1819 printk(KERN_ERR "%s: out of memory at line %d\n",
1820 __FUNCTION__, __LINE__);
1821 return -ENOMEM;
1822 }
1823
1824 INIT_LIST_HEAD(&sdbg_host->dev_info_list);
1825
1826 devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
1827 for (k = 0; k < devs_per_host; k++) {
1828 sdbg_devinfo = kzalloc(sizeof(*sdbg_devinfo), GFP_KERNEL);
1829 if (NULL == sdbg_devinfo) {
1830 printk(KERN_ERR "%s: out of memory at line %d\n",
1831 __FUNCTION__, __LINE__);
1832 error = -ENOMEM;
1833 goto clean;
1834 }
1835 sdbg_devinfo->sdbg_host = sdbg_host;
1836 list_add_tail(&sdbg_devinfo->dev_list,
1837 &sdbg_host->dev_info_list);
1838 }
1839
1840 spin_lock(&sdebug_host_list_lock);
1841 list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
1842 spin_unlock(&sdebug_host_list_lock);
1843
1844 sdbg_host->dev.bus = &pseudo_lld_bus;
1845 sdbg_host->dev.parent = &pseudo_primary;
1846 sdbg_host->dev.release = &sdebug_release_adapter;
1847 sprintf(sdbg_host->dev.bus_id, "adapter%d", scsi_debug_add_host);
1848
1849 error = device_register(&sdbg_host->dev);
1850
1851 if (error)
1852 goto clean;
1853
1854 ++scsi_debug_add_host;
1855 return error;
1856
1857 clean:
1858 list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1859 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1860 dev_list);
1861 list_del(&sdbg_devinfo->dev_list);
1862 kfree(sdbg_devinfo);
1863 }
1864
1865 kfree(sdbg_host);
1866 return error;
1867 }
1868
1869 static void sdebug_remove_adapter(void)
1870 {
1871 struct sdebug_host_info * sdbg_host = NULL;
1872
1873 spin_lock(&sdebug_host_list_lock);
1874 if (!list_empty(&sdebug_host_list)) {
1875 sdbg_host = list_entry(sdebug_host_list.prev,
1876 struct sdebug_host_info, host_list);
1877 list_del(&sdbg_host->host_list);
1878 }
1879 spin_unlock(&sdebug_host_list_lock);
1880
1881 if (!sdbg_host)
1882 return;
1883
1884 device_unregister(&sdbg_host->dev);
1885 --scsi_debug_add_host;
1886 }
1887
1888 static int sdebug_driver_probe(struct device * dev)
1889 {
1890 int error = 0;
1891 struct sdebug_host_info *sdbg_host;
1892 struct Scsi_Host *hpnt;
1893
1894 sdbg_host = to_sdebug_host(dev);
1895
1896 hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
1897 if (NULL == hpnt) {
1898 printk(KERN_ERR "%s: scsi_register failed\n", __FUNCTION__);
1899 error = -ENODEV;
1900 return error;
1901 }
1902
1903 sdbg_host->shost = hpnt;
1904 *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
1905 if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
1906 hpnt->max_id = scsi_debug_num_tgts + 1;
1907 else
1908 hpnt->max_id = scsi_debug_num_tgts;
1909 hpnt->max_lun = scsi_debug_max_luns;
1910
1911 error = scsi_add_host(hpnt, &sdbg_host->dev);
1912 if (error) {
1913 printk(KERN_ERR "%s: scsi_add_host failed\n", __FUNCTION__);
1914 error = -ENODEV;
1915 scsi_host_put(hpnt);
1916 } else
1917 scsi_scan_host(hpnt);
1918
1919
1920 return error;
1921 }
1922
1923 static int sdebug_driver_remove(struct device * dev)
1924 {
1925 struct list_head *lh, *lh_sf;
1926 struct sdebug_host_info *sdbg_host;
1927 struct sdebug_dev_info *sdbg_devinfo;
1928
1929 sdbg_host = to_sdebug_host(dev);
1930
1931 if (!sdbg_host) {
1932 printk(KERN_ERR "%s: Unable to locate host info\n",
1933 __FUNCTION__);
1934 return -ENODEV;
1935 }
1936
1937 scsi_remove_host(sdbg_host->shost);
1938
1939 list_for_each_safe(lh, lh_sf, &sdbg_host->dev_info_list) {
1940 sdbg_devinfo = list_entry(lh, struct sdebug_dev_info,
1941 dev_list);
1942 list_del(&sdbg_devinfo->dev_list);
1943 kfree(sdbg_devinfo);
1944 }
1945
1946 scsi_host_put(sdbg_host->shost);
1947 return 0;
1948 }
1949
1950 static void sdebug_max_tgts_luns(void)
1951 {
1952 struct sdebug_host_info * sdbg_host;
1953 struct Scsi_Host *hpnt;
1954
1955 spin_lock(&sdebug_host_list_lock);
1956 list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
1957 hpnt = sdbg_host->shost;
1958 if ((hpnt->this_id >= 0) &&
1959 (scsi_debug_num_tgts > hpnt->this_id))
1960 hpnt->max_id = scsi_debug_num_tgts + 1;
1961 else
1962 hpnt->max_id = scsi_debug_num_tgts;
1963 hpnt->max_lun = scsi_debug_max_luns;
1964 }
1965 spin_unlock(&sdebug_host_list_lock);
1966 }
Support for the Chinese Samsung S3C2440 based development boards