[SCSI] bnx2fc: Broadcom FCoE offload driver
[linux-2.6.git] / drivers / scsi / scsi_debug.c
1 /*
2  * vvvvvvvvvvvvvvvvvvvvvvv Original vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
3  *  Copyright (C) 1992  Eric Youngdale
4  *  Simulate a host adapter with 2 disks attached.  Do a lot of checking
5  *  to make sure that we are not getting blocks mixed up, and PANIC if
6  *  anything out of the ordinary is seen.
7  * ^^^^^^^^^^^^^^^^^^^^^^^ Original ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
8  *
9  *  This version is more generic, simulating a variable number of disk
10  *  (or disk like devices) sharing a common amount of RAM. To be more
11  *  realistic, the simulated devices have the transport attributes of
12  *  SAS disks.
13  *
14  *
15  *  For documentation see http://sg.danny.cz/sg/sdebug26.html
16  *
17  *   D. Gilbert (dpg) work for Magneto-Optical device test [20010421]
18  *   dpg: work for devfs large number of disks [20010809]
19  *        forked for lk 2.5 series [20011216, 20020101]
20  *        use vmalloc() more inquiry+mode_sense [20020302]
21  *        add timers for delayed responses [20020721]
22  *   Patrick Mansfield <patmans@us.ibm.com> max_luns+scsi_level [20021031]
23  *   Mike Anderson <andmike@us.ibm.com> sysfs work [20021118]
24  *   dpg: change style of boot options to "scsi_debug.num_tgts=2" and
25  *        module options to "modprobe scsi_debug num_tgts=2" [20021221]
26  */
27
28 #include <linux/module.h>
29
30 #include <linux/kernel.h>
31 #include <linux/errno.h>
32 #include <linux/timer.h>
33 #include <linux/slab.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/vmalloc.h>
41 #include <linux/moduleparam.h>
42 #include <linux/scatterlist.h>
43 #include <linux/blkdev.h>
44 #include <linux/crc-t10dif.h>
45
46 #include <net/checksum.h>
47
48 #include <asm/unaligned.h>
49
50 #include <scsi/scsi.h>
51 #include <scsi/scsi_cmnd.h>
52 #include <scsi/scsi_device.h>
53 #include <scsi/scsi_host.h>
54 #include <scsi/scsicam.h>
55 #include <scsi/scsi_eh.h>
56 #include <scsi/scsi_dbg.h>
57
58 #include "sd.h"
59 #include "scsi_logging.h"
60
61 #define SCSI_DEBUG_VERSION "1.82"
62 static const char * scsi_debug_version_date = "20100324";
63
64 /* Additional Sense Code (ASC) */
65 #define NO_ADDITIONAL_SENSE 0x0
66 #define LOGICAL_UNIT_NOT_READY 0x4
67 #define UNRECOVERED_READ_ERR 0x11
68 #define PARAMETER_LIST_LENGTH_ERR 0x1a
69 #define INVALID_OPCODE 0x20
70 #define ADDR_OUT_OF_RANGE 0x21
71 #define INVALID_COMMAND_OPCODE 0x20
72 #define INVALID_FIELD_IN_CDB 0x24
73 #define INVALID_FIELD_IN_PARAM_LIST 0x26
74 #define POWERON_RESET 0x29
75 #define SAVING_PARAMS_UNSUP 0x39
76 #define TRANSPORT_PROBLEM 0x4b
77 #define THRESHOLD_EXCEEDED 0x5d
78 #define LOW_POWER_COND_ON 0x5e
79
80 /* Additional Sense Code Qualifier (ASCQ) */
81 #define ACK_NAK_TO 0x3
82
83 #define SDEBUG_TAGGED_QUEUING 0 /* 0 | MSG_SIMPLE_TAG | MSG_ORDERED_TAG */
84
85 /* Default values for driver parameters */
86 #define DEF_NUM_HOST   1
87 #define DEF_NUM_TGTS   1
88 #define DEF_MAX_LUNS   1
89 /* With these defaults, this driver will make 1 host with 1 target
90  * (id 0) containing 1 logical unit (lun 0). That is 1 device.
91  */
92 #define DEF_DELAY   1
93 #define DEF_DEV_SIZE_MB   8
94 #define DEF_EVERY_NTH   0
95 #define DEF_NUM_PARTS   0
96 #define DEF_OPTS   0
97 #define DEF_SCSI_LEVEL   5    /* INQUIRY, byte2 [5->SPC-3] */
98 #define DEF_PTYPE   0
99 #define DEF_D_SENSE   0
100 #define DEF_NO_LUN_0   0
101 #define DEF_VIRTUAL_GB   0
102 #define DEF_FAKE_RW     0
103 #define DEF_VPD_USE_HOSTNO 1
104 #define DEF_SECTOR_SIZE 512
105 #define DEF_DIX 0
106 #define DEF_DIF 0
107 #define DEF_GUARD 0
108 #define DEF_ATO 1
109 #define DEF_PHYSBLK_EXP 0
110 #define DEF_LOWEST_ALIGNED 0
111 #define DEF_OPT_BLKS 64
112 #define DEF_UNMAP_MAX_BLOCKS 0xFFFFFFFF
113 #define DEF_UNMAP_MAX_DESC 256
114 #define DEF_UNMAP_GRANULARITY 1
115 #define DEF_UNMAP_ALIGNMENT 0
116 #define DEF_TPWS 0
117 #define DEF_TPU 0
118
119 /* bit mask values for scsi_debug_opts */
120 #define SCSI_DEBUG_OPT_NOISE   1
121 #define SCSI_DEBUG_OPT_MEDIUM_ERR   2
122 #define SCSI_DEBUG_OPT_TIMEOUT   4
123 #define SCSI_DEBUG_OPT_RECOVERED_ERR   8
124 #define SCSI_DEBUG_OPT_TRANSPORT_ERR   16
125 #define SCSI_DEBUG_OPT_DIF_ERR   32
126 #define SCSI_DEBUG_OPT_DIX_ERR   64
127 /* When "every_nth" > 0 then modulo "every_nth" commands:
128  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
129  *   - a RECOVERED_ERROR is simulated on successful read and write
130  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
131  *   - a TRANSPORT_ERROR is simulated on successful read and write
132  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
133  *
134  * When "every_nth" < 0 then after "- every_nth" commands:
135  *   - a no response is simulated if SCSI_DEBUG_OPT_TIMEOUT is set
136  *   - a RECOVERED_ERROR is simulated on successful read and write
137  *     commands if SCSI_DEBUG_OPT_RECOVERED_ERR is set.
138  *   - a TRANSPORT_ERROR is simulated on successful read and write
139  *     commands if SCSI_DEBUG_OPT_TRANSPORT_ERR is set.
140  * This will continue until some other action occurs (e.g. the user
141  * writing a new value (other than -1 or 1) to every_nth via sysfs).
142  */
143
144 /* when 1==SCSI_DEBUG_OPT_MEDIUM_ERR, a medium error is simulated at this
145  * sector on read commands: */
146 #define OPT_MEDIUM_ERR_ADDR   0x1234 /* that's sector 4660 in decimal */
147
148 /* If REPORT LUNS has luns >= 256 it can choose "flat space" (value 1)
149  * or "peripheral device" addressing (value 0) */
150 #define SAM2_LUN_ADDRESS_METHOD 0
151 #define SAM2_WLUN_REPORT_LUNS 0xc101
152
153 /* Can queue up to this number of commands. Typically commands that
154  * that have a non-zero delay are queued. */
155 #define SCSI_DEBUG_CANQUEUE  255
156
157 static int scsi_debug_add_host = DEF_NUM_HOST;
158 static int scsi_debug_delay = DEF_DELAY;
159 static int scsi_debug_dev_size_mb = DEF_DEV_SIZE_MB;
160 static int scsi_debug_every_nth = DEF_EVERY_NTH;
161 static int scsi_debug_max_luns = DEF_MAX_LUNS;
162 static int scsi_debug_max_queue = SCSI_DEBUG_CANQUEUE;
163 static int scsi_debug_num_parts = DEF_NUM_PARTS;
164 static int scsi_debug_no_uld = 0;
165 static int scsi_debug_num_tgts = DEF_NUM_TGTS; /* targets per host */
166 static int scsi_debug_opts = DEF_OPTS;
167 static int scsi_debug_scsi_level = DEF_SCSI_LEVEL;
168 static int scsi_debug_ptype = DEF_PTYPE; /* SCSI peripheral type (0==disk) */
169 static int scsi_debug_dsense = DEF_D_SENSE;
170 static int scsi_debug_no_lun_0 = DEF_NO_LUN_0;
171 static int scsi_debug_virtual_gb = DEF_VIRTUAL_GB;
172 static int scsi_debug_fake_rw = DEF_FAKE_RW;
173 static int scsi_debug_vpd_use_hostno = DEF_VPD_USE_HOSTNO;
174 static int scsi_debug_sector_size = DEF_SECTOR_SIZE;
175 static int scsi_debug_dix = DEF_DIX;
176 static int scsi_debug_dif = DEF_DIF;
177 static int scsi_debug_guard = DEF_GUARD;
178 static int scsi_debug_ato = DEF_ATO;
179 static int scsi_debug_physblk_exp = DEF_PHYSBLK_EXP;
180 static int scsi_debug_lowest_aligned = DEF_LOWEST_ALIGNED;
181 static int scsi_debug_opt_blks = DEF_OPT_BLKS;
182 static unsigned int scsi_debug_unmap_max_desc = DEF_UNMAP_MAX_DESC;
183 static unsigned int scsi_debug_unmap_max_blocks = DEF_UNMAP_MAX_BLOCKS;
184 static unsigned int scsi_debug_unmap_granularity = DEF_UNMAP_GRANULARITY;
185 static unsigned int scsi_debug_unmap_alignment = DEF_UNMAP_ALIGNMENT;
186 static unsigned int scsi_debug_tpws = DEF_TPWS;
187 static unsigned int scsi_debug_tpu = DEF_TPU;
188
189 static int scsi_debug_cmnd_count = 0;
190
191 #define DEV_READONLY(TGT)      (0)
192 #define DEV_REMOVEABLE(TGT)    (0)
193
194 static unsigned int sdebug_store_sectors;
195 static sector_t sdebug_capacity;        /* in sectors */
196
197 /* old BIOS stuff, kernel may get rid of them but some mode sense pages
198    may still need them */
199 static int sdebug_heads;                /* heads per disk */
200 static int sdebug_cylinders_per;        /* cylinders per surface */
201 static int sdebug_sectors_per;          /* sectors per cylinder */
202
203 #define SDEBUG_MAX_PARTS 4
204
205 #define SDEBUG_SENSE_LEN 32
206
207 #define SCSI_DEBUG_MAX_CMD_LEN 32
208
209 struct sdebug_dev_info {
210         struct list_head dev_list;
211         unsigned char sense_buff[SDEBUG_SENSE_LEN];     /* weak nexus */
212         unsigned int channel;
213         unsigned int target;
214         unsigned int lun;
215         struct sdebug_host_info *sdbg_host;
216         unsigned int wlun;
217         char reset;
218         char stopped;
219         char used;
220 };
221
222 struct sdebug_host_info {
223         struct list_head host_list;
224         struct Scsi_Host *shost;
225         struct device dev;
226         struct list_head dev_info_list;
227 };
228
229 #define to_sdebug_host(d)       \
230         container_of(d, struct sdebug_host_info, dev)
231
232 static LIST_HEAD(sdebug_host_list);
233 static DEFINE_SPINLOCK(sdebug_host_list_lock);
234
235 typedef void (* done_funct_t) (struct scsi_cmnd *);
236
237 struct sdebug_queued_cmd {
238         int in_use;
239         struct timer_list cmnd_timer;
240         done_funct_t done_funct;
241         struct scsi_cmnd * a_cmnd;
242         int scsi_result;
243 };
244 static struct sdebug_queued_cmd queued_arr[SCSI_DEBUG_CANQUEUE];
245
246 static unsigned char * fake_storep;     /* ramdisk storage */
247 static unsigned char *dif_storep;       /* protection info */
248 static void *map_storep;                /* provisioning map */
249
250 static unsigned long map_size;
251 static int num_aborts = 0;
252 static int num_dev_resets = 0;
253 static int num_bus_resets = 0;
254 static int num_host_resets = 0;
255 static int dix_writes;
256 static int dix_reads;
257 static int dif_errors;
258
259 static DEFINE_SPINLOCK(queued_arr_lock);
260 static DEFINE_RWLOCK(atomic_rw);
261
262 static char sdebug_proc_name[] = "scsi_debug";
263
264 static struct bus_type pseudo_lld_bus;
265
266 static inline sector_t dif_offset(sector_t sector)
267 {
268         return sector << 3;
269 }
270
271 static struct device_driver sdebug_driverfs_driver = {
272         .name           = sdebug_proc_name,
273         .bus            = &pseudo_lld_bus,
274 };
275
276 static const int check_condition_result =
277                 (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
278
279 static const int illegal_condition_result =
280         (DRIVER_SENSE << 24) | (DID_ABORT << 16) | SAM_STAT_CHECK_CONDITION;
281
282 static unsigned char ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
283                                     0, 0, 0x2, 0x4b};
284 static unsigned char iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
285                                    0, 0, 0x0, 0x0};
286
287 static int sdebug_add_adapter(void);
288 static void sdebug_remove_adapter(void);
289
290 static void sdebug_max_tgts_luns(void)
291 {
292         struct sdebug_host_info *sdbg_host;
293         struct Scsi_Host *hpnt;
294
295         spin_lock(&sdebug_host_list_lock);
296         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
297                 hpnt = sdbg_host->shost;
298                 if ((hpnt->this_id >= 0) &&
299                     (scsi_debug_num_tgts > hpnt->this_id))
300                         hpnt->max_id = scsi_debug_num_tgts + 1;
301                 else
302                         hpnt->max_id = scsi_debug_num_tgts;
303                 /* scsi_debug_max_luns; */
304                 hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;
305         }
306         spin_unlock(&sdebug_host_list_lock);
307 }
308
309 static void mk_sense_buffer(struct sdebug_dev_info *devip, int key,
310                             int asc, int asq)
311 {
312         unsigned char *sbuff;
313
314         sbuff = devip->sense_buff;
315         memset(sbuff, 0, SDEBUG_SENSE_LEN);
316
317         scsi_build_sense_buffer(scsi_debug_dsense, sbuff, key, asc, asq);
318
319         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
320                 printk(KERN_INFO "scsi_debug:    [sense_key,asc,ascq]: "
321                       "[0x%x,0x%x,0x%x]\n", key, asc, asq);
322 }
323
324 static void get_data_transfer_info(unsigned char *cmd,
325                                    unsigned long long *lba, unsigned int *num,
326                                    u32 *ei_lba)
327 {
328         *ei_lba = 0;
329
330         switch (*cmd) {
331         case VARIABLE_LENGTH_CMD:
332                 *lba = (u64)cmd[19] | (u64)cmd[18] << 8 |
333                         (u64)cmd[17] << 16 | (u64)cmd[16] << 24 |
334                         (u64)cmd[15] << 32 | (u64)cmd[14] << 40 |
335                         (u64)cmd[13] << 48 | (u64)cmd[12] << 56;
336
337                 *ei_lba = (u32)cmd[23] | (u32)cmd[22] << 8 |
338                         (u32)cmd[21] << 16 | (u32)cmd[20] << 24;
339
340                 *num = (u32)cmd[31] | (u32)cmd[30] << 8 | (u32)cmd[29] << 16 |
341                         (u32)cmd[28] << 24;
342                 break;
343
344         case WRITE_SAME_16:
345         case WRITE_16:
346         case READ_16:
347                 *lba = (u64)cmd[9] | (u64)cmd[8] << 8 |
348                         (u64)cmd[7] << 16 | (u64)cmd[6] << 24 |
349                         (u64)cmd[5] << 32 | (u64)cmd[4] << 40 |
350                         (u64)cmd[3] << 48 | (u64)cmd[2] << 56;
351
352                 *num = (u32)cmd[13] | (u32)cmd[12] << 8 | (u32)cmd[11] << 16 |
353                         (u32)cmd[10] << 24;
354                 break;
355         case WRITE_12:
356         case READ_12:
357                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
358                         (u32)cmd[2] << 24;
359
360                 *num = (u32)cmd[9] | (u32)cmd[8] << 8 | (u32)cmd[7] << 16 |
361                         (u32)cmd[6] << 24;
362                 break;
363         case WRITE_SAME:
364         case WRITE_10:
365         case READ_10:
366         case XDWRITEREAD_10:
367                 *lba = (u32)cmd[5] | (u32)cmd[4] << 8 | (u32)cmd[3] << 16 |
368                         (u32)cmd[2] << 24;
369
370                 *num = (u32)cmd[8] | (u32)cmd[7] << 8;
371                 break;
372         case WRITE_6:
373         case READ_6:
374                 *lba = (u32)cmd[3] | (u32)cmd[2] << 8 |
375                         (u32)(cmd[1] & 0x1f) << 16;
376                 *num = (0 == cmd[4]) ? 256 : cmd[4];
377                 break;
378         default:
379                 break;
380         }
381 }
382
383 static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
384 {
385         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
386                 printk(KERN_INFO "scsi_debug: ioctl: cmd=0x%x\n", cmd);
387         }
388         return -EINVAL;
389         /* return -ENOTTY; // correct return but upsets fdisk */
390 }
391
392 static int check_readiness(struct scsi_cmnd * SCpnt, int reset_only,
393                            struct sdebug_dev_info * devip)
394 {
395         if (devip->reset) {
396                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
397                         printk(KERN_INFO "scsi_debug: Reporting Unit "
398                                "attention: power on reset\n");
399                 devip->reset = 0;
400                 mk_sense_buffer(devip, UNIT_ATTENTION, POWERON_RESET, 0);
401                 return check_condition_result;
402         }
403         if ((0 == reset_only) && devip->stopped) {
404                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
405                         printk(KERN_INFO "scsi_debug: Reporting Not "
406                                "ready: initializing command required\n");
407                 mk_sense_buffer(devip, NOT_READY, LOGICAL_UNIT_NOT_READY,
408                                 0x2);
409                 return check_condition_result;
410         }
411         return 0;
412 }
413
414 /* Returns 0 if ok else (DID_ERROR << 16). Sets scp->resid . */
415 static int fill_from_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
416                                 int arr_len)
417 {
418         int act_len;
419         struct scsi_data_buffer *sdb = scsi_in(scp);
420
421         if (!sdb->length)
422                 return 0;
423         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_FROM_DEVICE))
424                 return (DID_ERROR << 16);
425
426         act_len = sg_copy_from_buffer(sdb->table.sgl, sdb->table.nents,
427                                       arr, arr_len);
428         if (sdb->resid)
429                 sdb->resid -= act_len;
430         else
431                 sdb->resid = scsi_bufflen(scp) - act_len;
432
433         return 0;
434 }
435
436 /* Returns number of bytes fetched into 'arr' or -1 if error. */
437 static int fetch_to_dev_buffer(struct scsi_cmnd *scp, unsigned char *arr,
438                                int arr_len)
439 {
440         if (!scsi_bufflen(scp))
441                 return 0;
442         if (!(scsi_bidi_cmnd(scp) || scp->sc_data_direction == DMA_TO_DEVICE))
443                 return -1;
444
445         return scsi_sg_copy_to_buffer(scp, arr, arr_len);
446 }
447
448
449 static const char * inq_vendor_id = "Linux   ";
450 static const char * inq_product_id = "scsi_debug      ";
451 static const char * inq_product_rev = "0004";
452
453 static int inquiry_evpd_83(unsigned char * arr, int port_group_id,
454                            int target_dev_id, int dev_id_num,
455                            const char * dev_id_str,
456                            int dev_id_str_len)
457 {
458         int num, port_a;
459         char b[32];
460
461         port_a = target_dev_id + 1;
462         /* T10 vendor identifier field format (faked) */
463         arr[0] = 0x2;   /* ASCII */
464         arr[1] = 0x1;
465         arr[2] = 0x0;
466         memcpy(&arr[4], inq_vendor_id, 8);
467         memcpy(&arr[12], inq_product_id, 16);
468         memcpy(&arr[28], dev_id_str, dev_id_str_len);
469         num = 8 + 16 + dev_id_str_len;
470         arr[3] = num;
471         num += 4;
472         if (dev_id_num >= 0) {
473                 /* NAA-5, Logical unit identifier (binary) */
474                 arr[num++] = 0x1;       /* binary (not necessarily sas) */
475                 arr[num++] = 0x3;       /* PIV=0, lu, naa */
476                 arr[num++] = 0x0;
477                 arr[num++] = 0x8;
478                 arr[num++] = 0x53;  /* naa-5 ieee company id=0x333333 (fake) */
479                 arr[num++] = 0x33;
480                 arr[num++] = 0x33;
481                 arr[num++] = 0x30;
482                 arr[num++] = (dev_id_num >> 24);
483                 arr[num++] = (dev_id_num >> 16) & 0xff;
484                 arr[num++] = (dev_id_num >> 8) & 0xff;
485                 arr[num++] = dev_id_num & 0xff;
486                 /* Target relative port number */
487                 arr[num++] = 0x61;      /* proto=sas, binary */
488                 arr[num++] = 0x94;      /* PIV=1, target port, rel port */
489                 arr[num++] = 0x0;       /* reserved */
490                 arr[num++] = 0x4;       /* length */
491                 arr[num++] = 0x0;       /* reserved */
492                 arr[num++] = 0x0;       /* reserved */
493                 arr[num++] = 0x0;
494                 arr[num++] = 0x1;       /* relative port A */
495         }
496         /* NAA-5, Target port identifier */
497         arr[num++] = 0x61;      /* proto=sas, binary */
498         arr[num++] = 0x93;      /* piv=1, target port, naa */
499         arr[num++] = 0x0;
500         arr[num++] = 0x8;
501         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
502         arr[num++] = 0x22;
503         arr[num++] = 0x22;
504         arr[num++] = 0x20;
505         arr[num++] = (port_a >> 24);
506         arr[num++] = (port_a >> 16) & 0xff;
507         arr[num++] = (port_a >> 8) & 0xff;
508         arr[num++] = port_a & 0xff;
509         /* NAA-5, Target port group identifier */
510         arr[num++] = 0x61;      /* proto=sas, binary */
511         arr[num++] = 0x95;      /* piv=1, target port group id */
512         arr[num++] = 0x0;
513         arr[num++] = 0x4;
514         arr[num++] = 0;
515         arr[num++] = 0;
516         arr[num++] = (port_group_id >> 8) & 0xff;
517         arr[num++] = port_group_id & 0xff;
518         /* NAA-5, Target device identifier */
519         arr[num++] = 0x61;      /* proto=sas, binary */
520         arr[num++] = 0xa3;      /* piv=1, target device, naa */
521         arr[num++] = 0x0;
522         arr[num++] = 0x8;
523         arr[num++] = 0x52;      /* naa-5, company id=0x222222 (fake) */
524         arr[num++] = 0x22;
525         arr[num++] = 0x22;
526         arr[num++] = 0x20;
527         arr[num++] = (target_dev_id >> 24);
528         arr[num++] = (target_dev_id >> 16) & 0xff;
529         arr[num++] = (target_dev_id >> 8) & 0xff;
530         arr[num++] = target_dev_id & 0xff;
531         /* SCSI name string: Target device identifier */
532         arr[num++] = 0x63;      /* proto=sas, UTF-8 */
533         arr[num++] = 0xa8;      /* piv=1, target device, SCSI name string */
534         arr[num++] = 0x0;
535         arr[num++] = 24;
536         memcpy(arr + num, "naa.52222220", 12);
537         num += 12;
538         snprintf(b, sizeof(b), "%08X", target_dev_id);
539         memcpy(arr + num, b, 8);
540         num += 8;
541         memset(arr + num, 0, 4);
542         num += 4;
543         return num;
544 }
545
546
547 static unsigned char vpd84_data[] = {
548 /* from 4th byte */ 0x22,0x22,0x22,0x0,0xbb,0x0,
549     0x22,0x22,0x22,0x0,0xbb,0x1,
550     0x22,0x22,0x22,0x0,0xbb,0x2,
551 };
552
553 static int inquiry_evpd_84(unsigned char * arr)
554 {
555         memcpy(arr, vpd84_data, sizeof(vpd84_data));
556         return sizeof(vpd84_data);
557 }
558
559 static int inquiry_evpd_85(unsigned char * arr)
560 {
561         int num = 0;
562         const char * na1 = "https://www.kernel.org/config";
563         const char * na2 = "http://www.kernel.org/log";
564         int plen, olen;
565
566         arr[num++] = 0x1;       /* lu, storage config */
567         arr[num++] = 0x0;       /* reserved */
568         arr[num++] = 0x0;
569         olen = strlen(na1);
570         plen = olen + 1;
571         if (plen % 4)
572                 plen = ((plen / 4) + 1) * 4;
573         arr[num++] = plen;      /* length, null termianted, padded */
574         memcpy(arr + num, na1, olen);
575         memset(arr + num + olen, 0, plen - olen);
576         num += plen;
577
578         arr[num++] = 0x4;       /* lu, logging */
579         arr[num++] = 0x0;       /* reserved */
580         arr[num++] = 0x0;
581         olen = strlen(na2);
582         plen = olen + 1;
583         if (plen % 4)
584                 plen = ((plen / 4) + 1) * 4;
585         arr[num++] = plen;      /* length, null terminated, padded */
586         memcpy(arr + num, na2, olen);
587         memset(arr + num + olen, 0, plen - olen);
588         num += plen;
589
590         return num;
591 }
592
593 /* SCSI ports VPD page */
594 static int inquiry_evpd_88(unsigned char * arr, int target_dev_id)
595 {
596         int num = 0;
597         int port_a, port_b;
598
599         port_a = target_dev_id + 1;
600         port_b = port_a + 1;
601         arr[num++] = 0x0;       /* reserved */
602         arr[num++] = 0x0;       /* reserved */
603         arr[num++] = 0x0;
604         arr[num++] = 0x1;       /* relative port 1 (primary) */
605         memset(arr + num, 0, 6);
606         num += 6;
607         arr[num++] = 0x0;
608         arr[num++] = 12;        /* length tp descriptor */
609         /* naa-5 target port identifier (A) */
610         arr[num++] = 0x61;      /* proto=sas, binary */
611         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
612         arr[num++] = 0x0;       /* reserved */
613         arr[num++] = 0x8;       /* length */
614         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
615         arr[num++] = 0x22;
616         arr[num++] = 0x22;
617         arr[num++] = 0x20;
618         arr[num++] = (port_a >> 24);
619         arr[num++] = (port_a >> 16) & 0xff;
620         arr[num++] = (port_a >> 8) & 0xff;
621         arr[num++] = port_a & 0xff;
622
623         arr[num++] = 0x0;       /* reserved */
624         arr[num++] = 0x0;       /* reserved */
625         arr[num++] = 0x0;
626         arr[num++] = 0x2;       /* relative port 2 (secondary) */
627         memset(arr + num, 0, 6);
628         num += 6;
629         arr[num++] = 0x0;
630         arr[num++] = 12;        /* length tp descriptor */
631         /* naa-5 target port identifier (B) */
632         arr[num++] = 0x61;      /* proto=sas, binary */
633         arr[num++] = 0x93;      /* PIV=1, target port, NAA */
634         arr[num++] = 0x0;       /* reserved */
635         arr[num++] = 0x8;       /* length */
636         arr[num++] = 0x52;      /* NAA-5, company_id=0x222222 (fake) */
637         arr[num++] = 0x22;
638         arr[num++] = 0x22;
639         arr[num++] = 0x20;
640         arr[num++] = (port_b >> 24);
641         arr[num++] = (port_b >> 16) & 0xff;
642         arr[num++] = (port_b >> 8) & 0xff;
643         arr[num++] = port_b & 0xff;
644
645         return num;
646 }
647
648
649 static unsigned char vpd89_data[] = {
650 /* from 4th byte */ 0,0,0,0,
651 'l','i','n','u','x',' ',' ',' ',
652 'S','A','T',' ','s','c','s','i','_','d','e','b','u','g',' ',' ',
653 '1','2','3','4',
654 0x34,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
655 0xec,0,0,0,
656 0x5a,0xc,0xff,0x3f,0x37,0xc8,0x10,0,0,0,0,0,0x3f,0,0,0,
657 0,0,0,0,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x58,0x20,0x20,0x20,0x20,
658 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0,0,0,0x40,0x4,0,0x2e,0x33,
659 0x38,0x31,0x20,0x20,0x20,0x20,0x54,0x53,0x38,0x33,0x30,0x30,0x33,0x31,
660 0x53,0x41,
661 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
662 0x20,0x20,
663 0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,0x20,
664 0x10,0x80,
665 0,0,0,0x2f,0,0,0,0x2,0,0x2,0x7,0,0xff,0xff,0x1,0,
666 0x3f,0,0xc1,0xff,0x3e,0,0x10,0x1,0xb0,0xf8,0x50,0x9,0,0,0x7,0,
667 0x3,0,0x78,0,0x78,0,0xf0,0,0x78,0,0,0,0,0,0,0,
668 0,0,0,0,0,0,0,0,0x2,0,0,0,0,0,0,0,
669 0x7e,0,0x1b,0,0x6b,0x34,0x1,0x7d,0x3,0x40,0x69,0x34,0x1,0x3c,0x3,0x40,
670 0x7f,0x40,0,0,0,0,0xfe,0xfe,0,0,0,0,0,0xfe,0,0,
671 0,0,0,0,0,0,0,0,0xb0,0xf8,0x50,0x9,0,0,0,0,
672 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
673 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
674 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
675 0x1,0,0xb0,0xf8,0x50,0x9,0xb0,0xf8,0x50,0x9,0x20,0x20,0x2,0,0xb6,0x42,
676 0,0x80,0x8a,0,0x6,0x3c,0xa,0x3c,0xff,0xff,0xc6,0x7,0,0x1,0,0x8,
677 0xf0,0xf,0,0x10,0x2,0,0x30,0,0,0,0,0,0,0,0x6,0xfe,
678 0,0,0x2,0,0x50,0,0x8a,0,0x4f,0x95,0,0,0x21,0,0xb,0,
679 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
680 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
681 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
682 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
683 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
684 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
685 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
686 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
687 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
688 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
689 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
690 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0xa5,0x51,
691 };
692
693 static int inquiry_evpd_89(unsigned char * arr)
694 {
695         memcpy(arr, vpd89_data, sizeof(vpd89_data));
696         return sizeof(vpd89_data);
697 }
698
699
700 /* Block limits VPD page (SBC-3) */
701 static unsigned char vpdb0_data[] = {
702         /* from 4th byte */ 0,0,0,4, 0,0,0x4,0, 0,0,0,64,
703         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
704         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
705         0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
706 };
707
708 static int inquiry_evpd_b0(unsigned char * arr)
709 {
710         unsigned int gran;
711
712         memcpy(arr, vpdb0_data, sizeof(vpdb0_data));
713
714         /* Optimal transfer length granularity */
715         gran = 1 << scsi_debug_physblk_exp;
716         arr[2] = (gran >> 8) & 0xff;
717         arr[3] = gran & 0xff;
718
719         /* Maximum Transfer Length */
720         if (sdebug_store_sectors > 0x400) {
721                 arr[4] = (sdebug_store_sectors >> 24) & 0xff;
722                 arr[5] = (sdebug_store_sectors >> 16) & 0xff;
723                 arr[6] = (sdebug_store_sectors >> 8) & 0xff;
724                 arr[7] = sdebug_store_sectors & 0xff;
725         }
726
727         /* Optimal Transfer Length */
728         put_unaligned_be32(scsi_debug_opt_blks, &arr[8]);
729
730         if (scsi_debug_tpu) {
731                 /* Maximum Unmap LBA Count */
732                 put_unaligned_be32(scsi_debug_unmap_max_blocks, &arr[16]);
733
734                 /* Maximum Unmap Block Descriptor Count */
735                 put_unaligned_be32(scsi_debug_unmap_max_desc, &arr[20]);
736         }
737
738         /* Unmap Granularity Alignment */
739         if (scsi_debug_unmap_alignment) {
740                 put_unaligned_be32(scsi_debug_unmap_alignment, &arr[28]);
741                 arr[28] |= 0x80; /* UGAVALID */
742         }
743
744         /* Optimal Unmap Granularity */
745         put_unaligned_be32(scsi_debug_unmap_granularity, &arr[24]);
746
747         return 0x3c; /* Mandatory page length for thin provisioning */
748
749         return sizeof(vpdb0_data);
750 }
751
752 /* Block device characteristics VPD page (SBC-3) */
753 static int inquiry_evpd_b1(unsigned char *arr)
754 {
755         memset(arr, 0, 0x3c);
756         arr[0] = 0;
757         arr[1] = 1;     /* non rotating medium (e.g. solid state) */
758         arr[2] = 0;
759         arr[3] = 5;     /* less than 1.8" */
760
761         return 0x3c;
762 }
763
764 /* Thin provisioning VPD page (SBC-3) */
765 static int inquiry_evpd_b2(unsigned char *arr)
766 {
767         memset(arr, 0, 0x8);
768         arr[0] = 0;                     /* threshold exponent */
769
770         if (scsi_debug_tpu)
771                 arr[1] = 1 << 7;
772
773         if (scsi_debug_tpws)
774                 arr[1] |= 1 << 6;
775
776         return 0x8;
777 }
778
779 #define SDEBUG_LONG_INQ_SZ 96
780 #define SDEBUG_MAX_INQ_ARR_SZ 584
781
782 static int resp_inquiry(struct scsi_cmnd * scp, int target,
783                         struct sdebug_dev_info * devip)
784 {
785         unsigned char pq_pdt;
786         unsigned char * arr;
787         unsigned char *cmd = (unsigned char *)scp->cmnd;
788         int alloc_len, n, ret;
789
790         alloc_len = (cmd[3] << 8) + cmd[4];
791         arr = kzalloc(SDEBUG_MAX_INQ_ARR_SZ, GFP_ATOMIC);
792         if (! arr)
793                 return DID_REQUEUE << 16;
794         if (devip->wlun)
795                 pq_pdt = 0x1e;  /* present, wlun */
796         else if (scsi_debug_no_lun_0 && (0 == devip->lun))
797                 pq_pdt = 0x7f;  /* not present, no device type */
798         else
799                 pq_pdt = (scsi_debug_ptype & 0x1f);
800         arr[0] = pq_pdt;
801         if (0x2 & cmd[1]) {  /* CMDDT bit set */
802                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
803                                 0);
804                 kfree(arr);
805                 return check_condition_result;
806         } else if (0x1 & cmd[1]) {  /* EVPD bit set */
807                 int lu_id_num, port_group_id, target_dev_id, len;
808                 char lu_id_str[6];
809                 int host_no = devip->sdbg_host->shost->host_no;
810                 
811                 port_group_id = (((host_no + 1) & 0x7f) << 8) +
812                     (devip->channel & 0x7f);
813                 if (0 == scsi_debug_vpd_use_hostno)
814                         host_no = 0;
815                 lu_id_num = devip->wlun ? -1 : (((host_no + 1) * 2000) +
816                             (devip->target * 1000) + devip->lun);
817                 target_dev_id = ((host_no + 1) * 2000) +
818                                  (devip->target * 1000) - 3;
819                 len = scnprintf(lu_id_str, 6, "%d", lu_id_num);
820                 if (0 == cmd[2]) { /* supported vital product data pages */
821                         arr[1] = cmd[2];        /*sanity */
822                         n = 4;
823                         arr[n++] = 0x0;   /* this page */
824                         arr[n++] = 0x80;  /* unit serial number */
825                         arr[n++] = 0x83;  /* device identification */
826                         arr[n++] = 0x84;  /* software interface ident. */
827                         arr[n++] = 0x85;  /* management network addresses */
828                         arr[n++] = 0x86;  /* extended inquiry */
829                         arr[n++] = 0x87;  /* mode page policy */
830                         arr[n++] = 0x88;  /* SCSI ports */
831                         arr[n++] = 0x89;  /* ATA information */
832                         arr[n++] = 0xb0;  /* Block limits (SBC) */
833                         arr[n++] = 0xb1;  /* Block characteristics (SBC) */
834                         arr[n++] = 0xb2;  /* Thin provisioning (SBC) */
835                         arr[3] = n - 4;   /* number of supported VPD pages */
836                 } else if (0x80 == cmd[2]) { /* unit serial number */
837                         arr[1] = cmd[2];        /*sanity */
838                         arr[3] = len;
839                         memcpy(&arr[4], lu_id_str, len);
840                 } else if (0x83 == cmd[2]) { /* device identification */
841                         arr[1] = cmd[2];        /*sanity */
842                         arr[3] = inquiry_evpd_83(&arr[4], port_group_id,
843                                                  target_dev_id, lu_id_num,
844                                                  lu_id_str, len);
845                 } else if (0x84 == cmd[2]) { /* Software interface ident. */
846                         arr[1] = cmd[2];        /*sanity */
847                         arr[3] = inquiry_evpd_84(&arr[4]);
848                 } else if (0x85 == cmd[2]) { /* Management network addresses */
849                         arr[1] = cmd[2];        /*sanity */
850                         arr[3] = inquiry_evpd_85(&arr[4]);
851                 } else if (0x86 == cmd[2]) { /* extended inquiry */
852                         arr[1] = cmd[2];        /*sanity */
853                         arr[3] = 0x3c;  /* number of following entries */
854                         if (scsi_debug_dif == SD_DIF_TYPE3_PROTECTION)
855                                 arr[4] = 0x4;   /* SPT: GRD_CHK:1 */
856                         else if (scsi_debug_dif)
857                                 arr[4] = 0x5;   /* SPT: GRD_CHK:1, REF_CHK:1 */
858                         else
859                                 arr[4] = 0x0;   /* no protection stuff */
860                         arr[5] = 0x7;   /* head of q, ordered + simple q's */
861                 } else if (0x87 == cmd[2]) { /* mode page policy */
862                         arr[1] = cmd[2];        /*sanity */
863                         arr[3] = 0x8;   /* number of following entries */
864                         arr[4] = 0x2;   /* disconnect-reconnect mp */
865                         arr[6] = 0x80;  /* mlus, shared */
866                         arr[8] = 0x18;   /* protocol specific lu */
867                         arr[10] = 0x82;  /* mlus, per initiator port */
868                 } else if (0x88 == cmd[2]) { /* SCSI Ports */
869                         arr[1] = cmd[2];        /*sanity */
870                         arr[3] = inquiry_evpd_88(&arr[4], target_dev_id);
871                 } else if (0x89 == cmd[2]) { /* ATA information */
872                         arr[1] = cmd[2];        /*sanity */
873                         n = inquiry_evpd_89(&arr[4]);
874                         arr[2] = (n >> 8);
875                         arr[3] = (n & 0xff);
876                 } else if (0xb0 == cmd[2]) { /* Block limits (SBC) */
877                         arr[1] = cmd[2];        /*sanity */
878                         arr[3] = inquiry_evpd_b0(&arr[4]);
879                 } else if (0xb1 == cmd[2]) { /* Block characteristics (SBC) */
880                         arr[1] = cmd[2];        /*sanity */
881                         arr[3] = inquiry_evpd_b1(&arr[4]);
882                 } else if (0xb2 == cmd[2]) { /* Thin provisioning (SBC) */
883                         arr[1] = cmd[2];        /*sanity */
884                         arr[3] = inquiry_evpd_b2(&arr[4]);
885                 } else {
886                         /* Illegal request, invalid field in cdb */
887                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
888                                         INVALID_FIELD_IN_CDB, 0);
889                         kfree(arr);
890                         return check_condition_result;
891                 }
892                 len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
893                 ret = fill_from_dev_buffer(scp, arr,
894                             min(len, SDEBUG_MAX_INQ_ARR_SZ));
895                 kfree(arr);
896                 return ret;
897         }
898         /* drops through here for a standard inquiry */
899         arr[1] = DEV_REMOVEABLE(target) ? 0x80 : 0;     /* Removable disk */
900         arr[2] = scsi_debug_scsi_level;
901         arr[3] = 2;    /* response_data_format==2 */
902         arr[4] = SDEBUG_LONG_INQ_SZ - 5;
903         arr[5] = scsi_debug_dif ? 1 : 0; /* PROTECT bit */
904         if (0 == scsi_debug_vpd_use_hostno)
905                 arr[5] = 0x10; /* claim: implicit TGPS */
906         arr[6] = 0x10; /* claim: MultiP */
907         /* arr[6] |= 0x40; ... claim: EncServ (enclosure services) */
908         arr[7] = 0xa; /* claim: LINKED + CMDQUE */
909         memcpy(&arr[8], inq_vendor_id, 8);
910         memcpy(&arr[16], inq_product_id, 16);
911         memcpy(&arr[32], inq_product_rev, 4);
912         /* version descriptors (2 bytes each) follow */
913         arr[58] = 0x0; arr[59] = 0x77; /* SAM-3 ANSI */
914         arr[60] = 0x3; arr[61] = 0x14;  /* SPC-3 ANSI */
915         n = 62;
916         if (scsi_debug_ptype == 0) {
917                 arr[n++] = 0x3; arr[n++] = 0x3d; /* SBC-2 ANSI */
918         } else if (scsi_debug_ptype == 1) {
919                 arr[n++] = 0x3; arr[n++] = 0x60; /* SSC-2 no version */
920         }
921         arr[n++] = 0xc; arr[n++] = 0xf;  /* SAS-1.1 rev 10 */
922         ret = fill_from_dev_buffer(scp, arr,
923                             min(alloc_len, SDEBUG_LONG_INQ_SZ));
924         kfree(arr);
925         return ret;
926 }
927
928 static int resp_requests(struct scsi_cmnd * scp,
929                          struct sdebug_dev_info * devip)
930 {
931         unsigned char * sbuff;
932         unsigned char *cmd = (unsigned char *)scp->cmnd;
933         unsigned char arr[SDEBUG_SENSE_LEN];
934         int want_dsense;
935         int len = 18;
936
937         memset(arr, 0, sizeof(arr));
938         if (devip->reset == 1)
939                 mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
940         want_dsense = !!(cmd[1] & 1) || scsi_debug_dsense;
941         sbuff = devip->sense_buff;
942         if ((iec_m_pg[2] & 0x4) && (6 == (iec_m_pg[3] & 0xf))) {
943                 if (want_dsense) {
944                         arr[0] = 0x72;
945                         arr[1] = 0x0;           /* NO_SENSE in sense_key */
946                         arr[2] = THRESHOLD_EXCEEDED;
947                         arr[3] = 0xff;          /* TEST set and MRIE==6 */
948                 } else {
949                         arr[0] = 0x70;
950                         arr[2] = 0x0;           /* NO_SENSE in sense_key */
951                         arr[7] = 0xa;           /* 18 byte sense buffer */
952                         arr[12] = THRESHOLD_EXCEEDED;
953                         arr[13] = 0xff;         /* TEST set and MRIE==6 */
954                 }
955         } else {
956                 memcpy(arr, sbuff, SDEBUG_SENSE_LEN);
957                 if ((cmd[1] & 1) && (! scsi_debug_dsense)) {
958                         /* DESC bit set and sense_buff in fixed format */
959                         memset(arr, 0, sizeof(arr));
960                         arr[0] = 0x72;
961                         arr[1] = sbuff[2];     /* sense key */
962                         arr[2] = sbuff[12];    /* asc */
963                         arr[3] = sbuff[13];    /* ascq */
964                         len = 8;
965                 }
966         }
967         mk_sense_buffer(devip, 0, NO_ADDITIONAL_SENSE, 0);
968         return fill_from_dev_buffer(scp, arr, len);
969 }
970
971 static int resp_start_stop(struct scsi_cmnd * scp,
972                            struct sdebug_dev_info * devip)
973 {
974         unsigned char *cmd = (unsigned char *)scp->cmnd;
975         int power_cond, errsts, start;
976
977         if ((errsts = check_readiness(scp, 1, devip)))
978                 return errsts;
979         power_cond = (cmd[4] & 0xf0) >> 4;
980         if (power_cond) {
981                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
982                                 0);
983                 return check_condition_result;
984         }
985         start = cmd[4] & 1;
986         if (start == devip->stopped)
987                 devip->stopped = !start;
988         return 0;
989 }
990
991 static sector_t get_sdebug_capacity(void)
992 {
993         if (scsi_debug_virtual_gb > 0)
994                 return (sector_t)scsi_debug_virtual_gb *
995                         (1073741824 / scsi_debug_sector_size);
996         else
997                 return sdebug_store_sectors;
998 }
999
1000 #define SDEBUG_READCAP_ARR_SZ 8
1001 static int resp_readcap(struct scsi_cmnd * scp,
1002                         struct sdebug_dev_info * devip)
1003 {
1004         unsigned char arr[SDEBUG_READCAP_ARR_SZ];
1005         unsigned int capac;
1006         int errsts;
1007
1008         if ((errsts = check_readiness(scp, 1, devip)))
1009                 return errsts;
1010         /* following just in case virtual_gb changed */
1011         sdebug_capacity = get_sdebug_capacity();
1012         memset(arr, 0, SDEBUG_READCAP_ARR_SZ);
1013         if (sdebug_capacity < 0xffffffff) {
1014                 capac = (unsigned int)sdebug_capacity - 1;
1015                 arr[0] = (capac >> 24);
1016                 arr[1] = (capac >> 16) & 0xff;
1017                 arr[2] = (capac >> 8) & 0xff;
1018                 arr[3] = capac & 0xff;
1019         } else {
1020                 arr[0] = 0xff;
1021                 arr[1] = 0xff;
1022                 arr[2] = 0xff;
1023                 arr[3] = 0xff;
1024         }
1025         arr[6] = (scsi_debug_sector_size >> 8) & 0xff;
1026         arr[7] = scsi_debug_sector_size & 0xff;
1027         return fill_from_dev_buffer(scp, arr, SDEBUG_READCAP_ARR_SZ);
1028 }
1029
1030 #define SDEBUG_READCAP16_ARR_SZ 32
1031 static int resp_readcap16(struct scsi_cmnd * scp,
1032                           struct sdebug_dev_info * devip)
1033 {
1034         unsigned char *cmd = (unsigned char *)scp->cmnd;
1035         unsigned char arr[SDEBUG_READCAP16_ARR_SZ];
1036         unsigned long long capac;
1037         int errsts, k, alloc_len;
1038
1039         if ((errsts = check_readiness(scp, 1, devip)))
1040                 return errsts;
1041         alloc_len = ((cmd[10] << 24) + (cmd[11] << 16) + (cmd[12] << 8)
1042                      + cmd[13]);
1043         /* following just in case virtual_gb changed */
1044         sdebug_capacity = get_sdebug_capacity();
1045         memset(arr, 0, SDEBUG_READCAP16_ARR_SZ);
1046         capac = sdebug_capacity - 1;
1047         for (k = 0; k < 8; ++k, capac >>= 8)
1048                 arr[7 - k] = capac & 0xff;
1049         arr[8] = (scsi_debug_sector_size >> 24) & 0xff;
1050         arr[9] = (scsi_debug_sector_size >> 16) & 0xff;
1051         arr[10] = (scsi_debug_sector_size >> 8) & 0xff;
1052         arr[11] = scsi_debug_sector_size & 0xff;
1053         arr[13] = scsi_debug_physblk_exp & 0xf;
1054         arr[14] = (scsi_debug_lowest_aligned >> 8) & 0x3f;
1055
1056         if (scsi_debug_tpu || scsi_debug_tpws)
1057                 arr[14] |= 0x80; /* TPE */
1058
1059         arr[15] = scsi_debug_lowest_aligned & 0xff;
1060
1061         if (scsi_debug_dif) {
1062                 arr[12] = (scsi_debug_dif - 1) << 1; /* P_TYPE */
1063                 arr[12] |= 1; /* PROT_EN */
1064         }
1065
1066         return fill_from_dev_buffer(scp, arr,
1067                                     min(alloc_len, SDEBUG_READCAP16_ARR_SZ));
1068 }
1069
1070 #define SDEBUG_MAX_TGTPGS_ARR_SZ 1412
1071
1072 static int resp_report_tgtpgs(struct scsi_cmnd * scp,
1073                               struct sdebug_dev_info * devip)
1074 {
1075         unsigned char *cmd = (unsigned char *)scp->cmnd;
1076         unsigned char * arr;
1077         int host_no = devip->sdbg_host->shost->host_no;
1078         int n, ret, alen, rlen;
1079         int port_group_a, port_group_b, port_a, port_b;
1080
1081         alen = ((cmd[6] << 24) + (cmd[7] << 16) + (cmd[8] << 8)
1082                 + cmd[9]);
1083
1084         arr = kzalloc(SDEBUG_MAX_TGTPGS_ARR_SZ, GFP_ATOMIC);
1085         if (! arr)
1086                 return DID_REQUEUE << 16;
1087         /*
1088          * EVPD page 0x88 states we have two ports, one
1089          * real and a fake port with no device connected.
1090          * So we create two port groups with one port each
1091          * and set the group with port B to unavailable.
1092          */
1093         port_a = 0x1; /* relative port A */
1094         port_b = 0x2; /* relative port B */
1095         port_group_a = (((host_no + 1) & 0x7f) << 8) +
1096             (devip->channel & 0x7f);
1097         port_group_b = (((host_no + 1) & 0x7f) << 8) +
1098             (devip->channel & 0x7f) + 0x80;
1099
1100         /*
1101          * The asymmetric access state is cycled according to the host_id.
1102          */
1103         n = 4;
1104         if (0 == scsi_debug_vpd_use_hostno) {
1105             arr[n++] = host_no % 3; /* Asymm access state */
1106             arr[n++] = 0x0F; /* claim: all states are supported */
1107         } else {
1108             arr[n++] = 0x0; /* Active/Optimized path */
1109             arr[n++] = 0x01; /* claim: only support active/optimized paths */
1110         }
1111         arr[n++] = (port_group_a >> 8) & 0xff;
1112         arr[n++] = port_group_a & 0xff;
1113         arr[n++] = 0;    /* Reserved */
1114         arr[n++] = 0;    /* Status code */
1115         arr[n++] = 0;    /* Vendor unique */
1116         arr[n++] = 0x1;  /* One port per group */
1117         arr[n++] = 0;    /* Reserved */
1118         arr[n++] = 0;    /* Reserved */
1119         arr[n++] = (port_a >> 8) & 0xff;
1120         arr[n++] = port_a & 0xff;
1121         arr[n++] = 3;    /* Port unavailable */
1122         arr[n++] = 0x08; /* claim: only unavailalbe paths are supported */
1123         arr[n++] = (port_group_b >> 8) & 0xff;
1124         arr[n++] = port_group_b & 0xff;
1125         arr[n++] = 0;    /* Reserved */
1126         arr[n++] = 0;    /* Status code */
1127         arr[n++] = 0;    /* Vendor unique */
1128         arr[n++] = 0x1;  /* One port per group */
1129         arr[n++] = 0;    /* Reserved */
1130         arr[n++] = 0;    /* Reserved */
1131         arr[n++] = (port_b >> 8) & 0xff;
1132         arr[n++] = port_b & 0xff;
1133
1134         rlen = n - 4;
1135         arr[0] = (rlen >> 24) & 0xff;
1136         arr[1] = (rlen >> 16) & 0xff;
1137         arr[2] = (rlen >> 8) & 0xff;
1138         arr[3] = rlen & 0xff;
1139
1140         /*
1141          * Return the smallest value of either
1142          * - The allocated length
1143          * - The constructed command length
1144          * - The maximum array size
1145          */
1146         rlen = min(alen,n);
1147         ret = fill_from_dev_buffer(scp, arr,
1148                                    min(rlen, SDEBUG_MAX_TGTPGS_ARR_SZ));
1149         kfree(arr);
1150         return ret;
1151 }
1152
1153 /* <<Following mode page info copied from ST318451LW>> */
1154
1155 static int resp_err_recov_pg(unsigned char * p, int pcontrol, int target)
1156 {       /* Read-Write Error Recovery page for mode_sense */
1157         unsigned char err_recov_pg[] = {0x1, 0xa, 0xc0, 11, 240, 0, 0, 0,
1158                                         5, 0, 0xff, 0xff};
1159
1160         memcpy(p, err_recov_pg, sizeof(err_recov_pg));
1161         if (1 == pcontrol)
1162                 memset(p + 2, 0, sizeof(err_recov_pg) - 2);
1163         return sizeof(err_recov_pg);
1164 }
1165
1166 static int resp_disconnect_pg(unsigned char * p, int pcontrol, int target)
1167 {       /* Disconnect-Reconnect page for mode_sense */
1168         unsigned char disconnect_pg[] = {0x2, 0xe, 128, 128, 0, 10, 0, 0,
1169                                          0, 0, 0, 0, 0, 0, 0, 0};
1170
1171         memcpy(p, disconnect_pg, sizeof(disconnect_pg));
1172         if (1 == pcontrol)
1173                 memset(p + 2, 0, sizeof(disconnect_pg) - 2);
1174         return sizeof(disconnect_pg);
1175 }
1176
1177 static int resp_format_pg(unsigned char * p, int pcontrol, int target)
1178 {       /* Format device page for mode_sense */
1179         unsigned char format_pg[] = {0x3, 0x16, 0, 0, 0, 0, 0, 0,
1180                                      0, 0, 0, 0, 0, 0, 0, 0,
1181                                      0, 0, 0, 0, 0x40, 0, 0, 0};
1182
1183         memcpy(p, format_pg, sizeof(format_pg));
1184         p[10] = (sdebug_sectors_per >> 8) & 0xff;
1185         p[11] = sdebug_sectors_per & 0xff;
1186         p[12] = (scsi_debug_sector_size >> 8) & 0xff;
1187         p[13] = scsi_debug_sector_size & 0xff;
1188         if (DEV_REMOVEABLE(target))
1189                 p[20] |= 0x20; /* should agree with INQUIRY */
1190         if (1 == pcontrol)
1191                 memset(p + 2, 0, sizeof(format_pg) - 2);
1192         return sizeof(format_pg);
1193 }
1194
1195 static int resp_caching_pg(unsigned char * p, int pcontrol, int target)
1196 {       /* Caching page for mode_sense */
1197         unsigned char caching_pg[] = {0x8, 18, 0x14, 0, 0xff, 0xff, 0, 0,
1198                 0xff, 0xff, 0xff, 0xff, 0x80, 0x14, 0, 0,     0, 0, 0, 0};
1199
1200         memcpy(p, caching_pg, sizeof(caching_pg));
1201         if (1 == pcontrol)
1202                 memset(p + 2, 0, sizeof(caching_pg) - 2);
1203         return sizeof(caching_pg);
1204 }
1205
1206 static int resp_ctrl_m_pg(unsigned char * p, int pcontrol, int target)
1207 {       /* Control mode page for mode_sense */
1208         unsigned char ch_ctrl_m_pg[] = {/* 0xa, 10, */ 0x6, 0, 0, 0, 0, 0,
1209                                         0, 0, 0, 0};
1210         unsigned char d_ctrl_m_pg[] = {0xa, 10, 2, 0, 0, 0, 0, 0,
1211                                      0, 0, 0x2, 0x4b};
1212
1213         if (scsi_debug_dsense)
1214                 ctrl_m_pg[2] |= 0x4;
1215         else
1216                 ctrl_m_pg[2] &= ~0x4;
1217
1218         if (scsi_debug_ato)
1219                 ctrl_m_pg[5] |= 0x80; /* ATO=1 */
1220
1221         memcpy(p, ctrl_m_pg, sizeof(ctrl_m_pg));
1222         if (1 == pcontrol)
1223                 memcpy(p + 2, ch_ctrl_m_pg, sizeof(ch_ctrl_m_pg));
1224         else if (2 == pcontrol)
1225                 memcpy(p, d_ctrl_m_pg, sizeof(d_ctrl_m_pg));
1226         return sizeof(ctrl_m_pg);
1227 }
1228
1229
1230 static int resp_iec_m_pg(unsigned char * p, int pcontrol, int target)
1231 {       /* Informational Exceptions control mode page for mode_sense */
1232         unsigned char ch_iec_m_pg[] = {/* 0x1c, 0xa, */ 0x4, 0xf, 0, 0, 0, 0,
1233                                        0, 0, 0x0, 0x0};
1234         unsigned char d_iec_m_pg[] = {0x1c, 0xa, 0x08, 0, 0, 0, 0, 0,
1235                                       0, 0, 0x0, 0x0};
1236
1237         memcpy(p, iec_m_pg, sizeof(iec_m_pg));
1238         if (1 == pcontrol)
1239                 memcpy(p + 2, ch_iec_m_pg, sizeof(ch_iec_m_pg));
1240         else if (2 == pcontrol)
1241                 memcpy(p, d_iec_m_pg, sizeof(d_iec_m_pg));
1242         return sizeof(iec_m_pg);
1243 }
1244
1245 static int resp_sas_sf_m_pg(unsigned char * p, int pcontrol, int target)
1246 {       /* SAS SSP mode page - short format for mode_sense */
1247         unsigned char sas_sf_m_pg[] = {0x19, 0x6,
1248                 0x6, 0x0, 0x7, 0xd0, 0x0, 0x0};
1249
1250         memcpy(p, sas_sf_m_pg, sizeof(sas_sf_m_pg));
1251         if (1 == pcontrol)
1252                 memset(p + 2, 0, sizeof(sas_sf_m_pg) - 2);
1253         return sizeof(sas_sf_m_pg);
1254 }
1255
1256
1257 static int resp_sas_pcd_m_spg(unsigned char * p, int pcontrol, int target,
1258                               int target_dev_id)
1259 {       /* SAS phy control and discover mode page for mode_sense */
1260         unsigned char sas_pcd_m_pg[] = {0x59, 0x1, 0, 0x64, 0, 0x6, 0, 2,
1261                     0, 0, 0, 0, 0x10, 0x9, 0x8, 0x0,
1262                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1263                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1264                     0x2, 0, 0, 0, 0, 0, 0, 0,
1265                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1266                     0, 0, 0, 0, 0, 0, 0, 0,
1267                     0, 1, 0, 0, 0x10, 0x9, 0x8, 0x0,
1268                     0x52, 0x22, 0x22, 0x20, 0x0, 0x0, 0x0, 0x0,
1269                     0x51, 0x11, 0x11, 0x10, 0x0, 0x0, 0x0, 0x1,
1270                     0x3, 0, 0, 0, 0, 0, 0, 0,
1271                     0x88, 0x99, 0, 0, 0, 0, 0, 0,
1272                     0, 0, 0, 0, 0, 0, 0, 0,
1273                 };
1274         int port_a, port_b;
1275
1276         port_a = target_dev_id + 1;
1277         port_b = port_a + 1;
1278         memcpy(p, sas_pcd_m_pg, sizeof(sas_pcd_m_pg));
1279         p[20] = (port_a >> 24);
1280         p[21] = (port_a >> 16) & 0xff;
1281         p[22] = (port_a >> 8) & 0xff;
1282         p[23] = port_a & 0xff;
1283         p[48 + 20] = (port_b >> 24);
1284         p[48 + 21] = (port_b >> 16) & 0xff;
1285         p[48 + 22] = (port_b >> 8) & 0xff;
1286         p[48 + 23] = port_b & 0xff;
1287         if (1 == pcontrol)
1288                 memset(p + 4, 0, sizeof(sas_pcd_m_pg) - 4);
1289         return sizeof(sas_pcd_m_pg);
1290 }
1291
1292 static int resp_sas_sha_m_spg(unsigned char * p, int pcontrol)
1293 {       /* SAS SSP shared protocol specific port mode subpage */
1294         unsigned char sas_sha_m_pg[] = {0x59, 0x2, 0, 0xc, 0, 0x6, 0x10, 0,
1295                     0, 0, 0, 0, 0, 0, 0, 0,
1296                 };
1297
1298         memcpy(p, sas_sha_m_pg, sizeof(sas_sha_m_pg));
1299         if (1 == pcontrol)
1300                 memset(p + 4, 0, sizeof(sas_sha_m_pg) - 4);
1301         return sizeof(sas_sha_m_pg);
1302 }
1303
1304 #define SDEBUG_MAX_MSENSE_SZ 256
1305
1306 static int resp_mode_sense(struct scsi_cmnd * scp, int target,
1307                            struct sdebug_dev_info * devip)
1308 {
1309         unsigned char dbd, llbaa;
1310         int pcontrol, pcode, subpcode, bd_len;
1311         unsigned char dev_spec;
1312         int k, alloc_len, msense_6, offset, len, errsts, target_dev_id;
1313         unsigned char * ap;
1314         unsigned char arr[SDEBUG_MAX_MSENSE_SZ];
1315         unsigned char *cmd = (unsigned char *)scp->cmnd;
1316
1317         if ((errsts = check_readiness(scp, 1, devip)))
1318                 return errsts;
1319         dbd = !!(cmd[1] & 0x8);
1320         pcontrol = (cmd[2] & 0xc0) >> 6;
1321         pcode = cmd[2] & 0x3f;
1322         subpcode = cmd[3];
1323         msense_6 = (MODE_SENSE == cmd[0]);
1324         llbaa = msense_6 ? 0 : !!(cmd[1] & 0x10);
1325         if ((0 == scsi_debug_ptype) && (0 == dbd))
1326                 bd_len = llbaa ? 16 : 8;
1327         else
1328                 bd_len = 0;
1329         alloc_len = msense_6 ? cmd[4] : ((cmd[7] << 8) | cmd[8]);
1330         memset(arr, 0, SDEBUG_MAX_MSENSE_SZ);
1331         if (0x3 == pcontrol) {  /* Saving values not supported */
1332                 mk_sense_buffer(devip, ILLEGAL_REQUEST, SAVING_PARAMS_UNSUP,
1333                                 0);
1334                 return check_condition_result;
1335         }
1336         target_dev_id = ((devip->sdbg_host->shost->host_no + 1) * 2000) +
1337                         (devip->target * 1000) - 3;
1338         /* set DPOFUA bit for disks */
1339         if (0 == scsi_debug_ptype)
1340                 dev_spec = (DEV_READONLY(target) ? 0x80 : 0x0) | 0x10;
1341         else
1342                 dev_spec = 0x0;
1343         if (msense_6) {
1344                 arr[2] = dev_spec;
1345                 arr[3] = bd_len;
1346                 offset = 4;
1347         } else {
1348                 arr[3] = dev_spec;
1349                 if (16 == bd_len)
1350                         arr[4] = 0x1;   /* set LONGLBA bit */
1351                 arr[7] = bd_len;        /* assume 255 or less */
1352                 offset = 8;
1353         }
1354         ap = arr + offset;
1355         if ((bd_len > 0) && (!sdebug_capacity))
1356                 sdebug_capacity = get_sdebug_capacity();
1357
1358         if (8 == bd_len) {
1359                 if (sdebug_capacity > 0xfffffffe) {
1360                         ap[0] = 0xff;
1361                         ap[1] = 0xff;
1362                         ap[2] = 0xff;
1363                         ap[3] = 0xff;
1364                 } else {
1365                         ap[0] = (sdebug_capacity >> 24) & 0xff;
1366                         ap[1] = (sdebug_capacity >> 16) & 0xff;
1367                         ap[2] = (sdebug_capacity >> 8) & 0xff;
1368                         ap[3] = sdebug_capacity & 0xff;
1369                 }
1370                 ap[6] = (scsi_debug_sector_size >> 8) & 0xff;
1371                 ap[7] = scsi_debug_sector_size & 0xff;
1372                 offset += bd_len;
1373                 ap = arr + offset;
1374         } else if (16 == bd_len) {
1375                 unsigned long long capac = sdebug_capacity;
1376
1377                 for (k = 0; k < 8; ++k, capac >>= 8)
1378                         ap[7 - k] = capac & 0xff;
1379                 ap[12] = (scsi_debug_sector_size >> 24) & 0xff;
1380                 ap[13] = (scsi_debug_sector_size >> 16) & 0xff;
1381                 ap[14] = (scsi_debug_sector_size >> 8) & 0xff;
1382                 ap[15] = scsi_debug_sector_size & 0xff;
1383                 offset += bd_len;
1384                 ap = arr + offset;
1385         }
1386
1387         if ((subpcode > 0x0) && (subpcode < 0xff) && (0x19 != pcode)) {
1388                 /* TODO: Control Extension page */
1389                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1390                                 0);
1391                 return check_condition_result;
1392         }
1393         switch (pcode) {
1394         case 0x1:       /* Read-Write error recovery page, direct access */
1395                 len = resp_err_recov_pg(ap, pcontrol, target);
1396                 offset += len;
1397                 break;
1398         case 0x2:       /* Disconnect-Reconnect page, all devices */
1399                 len = resp_disconnect_pg(ap, pcontrol, target);
1400                 offset += len;
1401                 break;
1402         case 0x3:       /* Format device page, direct access */
1403                 len = resp_format_pg(ap, pcontrol, target);
1404                 offset += len;
1405                 break;
1406         case 0x8:       /* Caching page, direct access */
1407                 len = resp_caching_pg(ap, pcontrol, target);
1408                 offset += len;
1409                 break;
1410         case 0xa:       /* Control Mode page, all devices */
1411                 len = resp_ctrl_m_pg(ap, pcontrol, target);
1412                 offset += len;
1413                 break;
1414         case 0x19:      /* if spc==1 then sas phy, control+discover */
1415                 if ((subpcode > 0x2) && (subpcode < 0xff)) {
1416                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1417                                         INVALID_FIELD_IN_CDB, 0);
1418                         return check_condition_result;
1419                 }
1420                 len = 0;
1421                 if ((0x0 == subpcode) || (0xff == subpcode))
1422                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1423                 if ((0x1 == subpcode) || (0xff == subpcode))
1424                         len += resp_sas_pcd_m_spg(ap + len, pcontrol, target,
1425                                                   target_dev_id);
1426                 if ((0x2 == subpcode) || (0xff == subpcode))
1427                         len += resp_sas_sha_m_spg(ap + len, pcontrol);
1428                 offset += len;
1429                 break;
1430         case 0x1c:      /* Informational Exceptions Mode page, all devices */
1431                 len = resp_iec_m_pg(ap, pcontrol, target);
1432                 offset += len;
1433                 break;
1434         case 0x3f:      /* Read all Mode pages */
1435                 if ((0 == subpcode) || (0xff == subpcode)) {
1436                         len = resp_err_recov_pg(ap, pcontrol, target);
1437                         len += resp_disconnect_pg(ap + len, pcontrol, target);
1438                         len += resp_format_pg(ap + len, pcontrol, target);
1439                         len += resp_caching_pg(ap + len, pcontrol, target);
1440                         len += resp_ctrl_m_pg(ap + len, pcontrol, target);
1441                         len += resp_sas_sf_m_pg(ap + len, pcontrol, target);
1442                         if (0xff == subpcode) {
1443                                 len += resp_sas_pcd_m_spg(ap + len, pcontrol,
1444                                                   target, target_dev_id);
1445                                 len += resp_sas_sha_m_spg(ap + len, pcontrol);
1446                         }
1447                         len += resp_iec_m_pg(ap + len, pcontrol, target);
1448                 } else {
1449                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1450                                         INVALID_FIELD_IN_CDB, 0);
1451                         return check_condition_result;
1452                 }
1453                 offset += len;
1454                 break;
1455         default:
1456                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
1457                                 0);
1458                 return check_condition_result;
1459         }
1460         if (msense_6)
1461                 arr[0] = offset - 1;
1462         else {
1463                 arr[0] = ((offset - 2) >> 8) & 0xff;
1464                 arr[1] = (offset - 2) & 0xff;
1465         }
1466         return fill_from_dev_buffer(scp, arr, min(alloc_len, offset));
1467 }
1468
1469 #define SDEBUG_MAX_MSELECT_SZ 512
1470
1471 static int resp_mode_select(struct scsi_cmnd * scp, int mselect6,
1472                             struct sdebug_dev_info * devip)
1473 {
1474         int pf, sp, ps, md_len, bd_len, off, spf, pg_len;
1475         int param_len, res, errsts, mpage;
1476         unsigned char arr[SDEBUG_MAX_MSELECT_SZ];
1477         unsigned char *cmd = (unsigned char *)scp->cmnd;
1478
1479         if ((errsts = check_readiness(scp, 1, devip)))
1480                 return errsts;
1481         memset(arr, 0, sizeof(arr));
1482         pf = cmd[1] & 0x10;
1483         sp = cmd[1] & 0x1;
1484         param_len = mselect6 ? cmd[4] : ((cmd[7] << 8) + cmd[8]);
1485         if ((0 == pf) || sp || (param_len > SDEBUG_MAX_MSELECT_SZ)) {
1486                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1487                                 INVALID_FIELD_IN_CDB, 0);
1488                 return check_condition_result;
1489         }
1490         res = fetch_to_dev_buffer(scp, arr, param_len);
1491         if (-1 == res)
1492                 return (DID_ERROR << 16);
1493         else if ((res < param_len) &&
1494                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
1495                 printk(KERN_INFO "scsi_debug: mode_select: cdb indicated=%d, "
1496                        " IO sent=%d bytes\n", param_len, res);
1497         md_len = mselect6 ? (arr[0] + 1) : ((arr[0] << 8) + arr[1] + 2);
1498         bd_len = mselect6 ? arr[3] : ((arr[6] << 8) + arr[7]);
1499         if (md_len > 2) {
1500                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1501                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1502                 return check_condition_result;
1503         }
1504         off = bd_len + (mselect6 ? 4 : 8);
1505         mpage = arr[off] & 0x3f;
1506         ps = !!(arr[off] & 0x80);
1507         if (ps) {
1508                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1509                                 INVALID_FIELD_IN_PARAM_LIST, 0);
1510                 return check_condition_result;
1511         }
1512         spf = !!(arr[off] & 0x40);
1513         pg_len = spf ? ((arr[off + 2] << 8) + arr[off + 3] + 4) :
1514                        (arr[off + 1] + 2);
1515         if ((pg_len + off) > param_len) {
1516                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1517                                 PARAMETER_LIST_LENGTH_ERR, 0);
1518                 return check_condition_result;
1519         }
1520         switch (mpage) {
1521         case 0xa:      /* Control Mode page */
1522                 if (ctrl_m_pg[1] == arr[off + 1]) {
1523                         memcpy(ctrl_m_pg + 2, arr + off + 2,
1524                                sizeof(ctrl_m_pg) - 2);
1525                         scsi_debug_dsense = !!(ctrl_m_pg[2] & 0x4);
1526                         return 0;
1527                 }
1528                 break;
1529         case 0x1c:      /* Informational Exceptions Mode page */
1530                 if (iec_m_pg[1] == arr[off + 1]) {
1531                         memcpy(iec_m_pg + 2, arr + off + 2,
1532                                sizeof(iec_m_pg) - 2);
1533                         return 0;
1534                 }
1535                 break;
1536         default:
1537                 break;
1538         }
1539         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1540                         INVALID_FIELD_IN_PARAM_LIST, 0);
1541         return check_condition_result;
1542 }
1543
1544 static int resp_temp_l_pg(unsigned char * arr)
1545 {
1546         unsigned char temp_l_pg[] = {0x0, 0x0, 0x3, 0x2, 0x0, 38,
1547                                      0x0, 0x1, 0x3, 0x2, 0x0, 65,
1548                 };
1549
1550         memcpy(arr, temp_l_pg, sizeof(temp_l_pg));
1551         return sizeof(temp_l_pg);
1552 }
1553
1554 static int resp_ie_l_pg(unsigned char * arr)
1555 {
1556         unsigned char ie_l_pg[] = {0x0, 0x0, 0x3, 0x3, 0x0, 0x0, 38,
1557                 };
1558
1559         memcpy(arr, ie_l_pg, sizeof(ie_l_pg));
1560         if (iec_m_pg[2] & 0x4) {        /* TEST bit set */
1561                 arr[4] = THRESHOLD_EXCEEDED;
1562                 arr[5] = 0xff;
1563         }
1564         return sizeof(ie_l_pg);
1565 }
1566
1567 #define SDEBUG_MAX_LSENSE_SZ 512
1568
1569 static int resp_log_sense(struct scsi_cmnd * scp,
1570                           struct sdebug_dev_info * devip)
1571 {
1572         int ppc, sp, pcontrol, pcode, subpcode, alloc_len, errsts, len, n;
1573         unsigned char arr[SDEBUG_MAX_LSENSE_SZ];
1574         unsigned char *cmd = (unsigned char *)scp->cmnd;
1575
1576         if ((errsts = check_readiness(scp, 1, devip)))
1577                 return errsts;
1578         memset(arr, 0, sizeof(arr));
1579         ppc = cmd[1] & 0x2;
1580         sp = cmd[1] & 0x1;
1581         if (ppc || sp) {
1582                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1583                                 INVALID_FIELD_IN_CDB, 0);
1584                 return check_condition_result;
1585         }
1586         pcontrol = (cmd[2] & 0xc0) >> 6;
1587         pcode = cmd[2] & 0x3f;
1588         subpcode = cmd[3] & 0xff;
1589         alloc_len = (cmd[7] << 8) + cmd[8];
1590         arr[0] = pcode;
1591         if (0 == subpcode) {
1592                 switch (pcode) {
1593                 case 0x0:       /* Supported log pages log page */
1594                         n = 4;
1595                         arr[n++] = 0x0;         /* this page */
1596                         arr[n++] = 0xd;         /* Temperature */
1597                         arr[n++] = 0x2f;        /* Informational exceptions */
1598                         arr[3] = n - 4;
1599                         break;
1600                 case 0xd:       /* Temperature log page */
1601                         arr[3] = resp_temp_l_pg(arr + 4);
1602                         break;
1603                 case 0x2f:      /* Informational exceptions log page */
1604                         arr[3] = resp_ie_l_pg(arr + 4);
1605                         break;
1606                 default:
1607                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1608                                         INVALID_FIELD_IN_CDB, 0);
1609                         return check_condition_result;
1610                 }
1611         } else if (0xff == subpcode) {
1612                 arr[0] |= 0x40;
1613                 arr[1] = subpcode;
1614                 switch (pcode) {
1615                 case 0x0:       /* Supported log pages and subpages log page */
1616                         n = 4;
1617                         arr[n++] = 0x0;
1618                         arr[n++] = 0x0;         /* 0,0 page */
1619                         arr[n++] = 0x0;
1620                         arr[n++] = 0xff;        /* this page */
1621                         arr[n++] = 0xd;
1622                         arr[n++] = 0x0;         /* Temperature */
1623                         arr[n++] = 0x2f;
1624                         arr[n++] = 0x0; /* Informational exceptions */
1625                         arr[3] = n - 4;
1626                         break;
1627                 case 0xd:       /* Temperature subpages */
1628                         n = 4;
1629                         arr[n++] = 0xd;
1630                         arr[n++] = 0x0;         /* Temperature */
1631                         arr[3] = n - 4;
1632                         break;
1633                 case 0x2f:      /* Informational exceptions subpages */
1634                         n = 4;
1635                         arr[n++] = 0x2f;
1636                         arr[n++] = 0x0;         /* Informational exceptions */
1637                         arr[3] = n - 4;
1638                         break;
1639                 default:
1640                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
1641                                         INVALID_FIELD_IN_CDB, 0);
1642                         return check_condition_result;
1643                 }
1644         } else {
1645                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
1646                                 INVALID_FIELD_IN_CDB, 0);
1647                 return check_condition_result;
1648         }
1649         len = min(((arr[2] << 8) + arr[3]) + 4, alloc_len);
1650         return fill_from_dev_buffer(scp, arr,
1651                     min(len, SDEBUG_MAX_INQ_ARR_SZ));
1652 }
1653
1654 static int check_device_access_params(struct sdebug_dev_info *devi,
1655                                       unsigned long long lba, unsigned int num)
1656 {
1657         if (lba + num > sdebug_capacity) {
1658                 mk_sense_buffer(devi, ILLEGAL_REQUEST, ADDR_OUT_OF_RANGE, 0);
1659                 return check_condition_result;
1660         }
1661         /* transfer length excessive (tie in to block limits VPD page) */
1662         if (num > sdebug_store_sectors) {
1663                 mk_sense_buffer(devi, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB, 0);
1664                 return check_condition_result;
1665         }
1666         return 0;
1667 }
1668
1669 static int do_device_access(struct scsi_cmnd *scmd,
1670                             struct sdebug_dev_info *devi,
1671                             unsigned long long lba, unsigned int num, int write)
1672 {
1673         int ret;
1674         unsigned int block, rest = 0;
1675         int (*func)(struct scsi_cmnd *, unsigned char *, int);
1676
1677         func = write ? fetch_to_dev_buffer : fill_from_dev_buffer;
1678
1679         block = do_div(lba, sdebug_store_sectors);
1680         if (block + num > sdebug_store_sectors)
1681                 rest = block + num - sdebug_store_sectors;
1682
1683         ret = func(scmd, fake_storep + (block * scsi_debug_sector_size),
1684                    (num - rest) * scsi_debug_sector_size);
1685         if (!ret && rest)
1686                 ret = func(scmd, fake_storep, rest * scsi_debug_sector_size);
1687
1688         return ret;
1689 }
1690
1691 static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
1692                             unsigned int sectors, u32 ei_lba)
1693 {
1694         unsigned int i, resid;
1695         struct scatterlist *psgl;
1696         struct sd_dif_tuple *sdt;
1697         sector_t sector;
1698         sector_t tmp_sec = start_sec;
1699         void *paddr;
1700
1701         start_sec = do_div(tmp_sec, sdebug_store_sectors);
1702
1703         sdt = (struct sd_dif_tuple *)(dif_storep + dif_offset(start_sec));
1704
1705         for (i = 0 ; i < sectors ; i++) {
1706                 u16 csum;
1707
1708                 if (sdt[i].app_tag == 0xffff)
1709                         continue;
1710
1711                 sector = start_sec + i;
1712
1713                 switch (scsi_debug_guard) {
1714                 case 1:
1715                         csum = ip_compute_csum(fake_storep +
1716                                                sector * scsi_debug_sector_size,
1717                                                scsi_debug_sector_size);
1718                         break;
1719                 case 0:
1720                         csum = crc_t10dif(fake_storep +
1721                                           sector * scsi_debug_sector_size,
1722                                           scsi_debug_sector_size);
1723                         csum = cpu_to_be16(csum);
1724                         break;
1725                 default:
1726                         BUG();
1727                 }
1728
1729                 if (sdt[i].guard_tag != csum) {
1730                         printk(KERN_ERR "%s: GUARD check failed on sector %lu" \
1731                                " rcvd 0x%04x, data 0x%04x\n", __func__,
1732                                (unsigned long)sector,
1733                                be16_to_cpu(sdt[i].guard_tag),
1734                                be16_to_cpu(csum));
1735                         dif_errors++;
1736                         return 0x01;
1737                 }
1738
1739                 if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1740                     be32_to_cpu(sdt[i].ref_tag) != (sector & 0xffffffff)) {
1741                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1742                                __func__, (unsigned long)sector);
1743                         dif_errors++;
1744                         return 0x03;
1745                 }
1746
1747                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1748                     be32_to_cpu(sdt[i].ref_tag) != ei_lba) {
1749                         printk(KERN_ERR "%s: REF check failed on sector %lu\n",
1750                                __func__, (unsigned long)sector);
1751                         dif_errors++;
1752                         return 0x03;
1753                 }
1754
1755                 ei_lba++;
1756         }
1757
1758         resid = sectors * 8; /* Bytes of protection data to copy into sgl */
1759         sector = start_sec;
1760
1761         scsi_for_each_prot_sg(SCpnt, psgl, scsi_prot_sg_count(SCpnt), i) {
1762                 int len = min(psgl->length, resid);
1763
1764                 paddr = kmap_atomic(sg_page(psgl), KM_IRQ0) + psgl->offset;
1765                 memcpy(paddr, dif_storep + dif_offset(sector), len);
1766
1767                 sector += len >> 3;
1768                 if (sector >= sdebug_store_sectors) {
1769                         /* Force wrap */
1770                         tmp_sec = sector;
1771                         sector = do_div(tmp_sec, sdebug_store_sectors);
1772                 }
1773                 resid -= len;
1774                 kunmap_atomic(paddr, KM_IRQ0);
1775         }
1776
1777         dix_reads++;
1778
1779         return 0;
1780 }
1781
1782 static int resp_read(struct scsi_cmnd *SCpnt, unsigned long long lba,
1783                      unsigned int num, struct sdebug_dev_info *devip,
1784                      u32 ei_lba)
1785 {
1786         unsigned long iflags;
1787         int ret;
1788
1789         ret = check_device_access_params(devip, lba, num);
1790         if (ret)
1791                 return ret;
1792
1793         if ((SCSI_DEBUG_OPT_MEDIUM_ERR & scsi_debug_opts) &&
1794             (lba <= OPT_MEDIUM_ERR_ADDR) &&
1795             ((lba + num) > OPT_MEDIUM_ERR_ADDR)) {
1796                 /* claim unrecoverable read error */
1797                 mk_sense_buffer(devip, MEDIUM_ERROR, UNRECOVERED_READ_ERR,
1798                                 0);
1799                 /* set info field and valid bit for fixed descriptor */
1800                 if (0x70 == (devip->sense_buff[0] & 0x7f)) {
1801                         devip->sense_buff[0] |= 0x80;   /* Valid bit */
1802                         ret = OPT_MEDIUM_ERR_ADDR;
1803                         devip->sense_buff[3] = (ret >> 24) & 0xff;
1804                         devip->sense_buff[4] = (ret >> 16) & 0xff;
1805                         devip->sense_buff[5] = (ret >> 8) & 0xff;
1806                         devip->sense_buff[6] = ret & 0xff;
1807                 }
1808                 scsi_set_resid(SCpnt, scsi_bufflen(SCpnt));
1809                 return check_condition_result;
1810         }
1811
1812         /* DIX + T10 DIF */
1813         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
1814                 int prot_ret = prot_verify_read(SCpnt, lba, num, ei_lba);
1815
1816                 if (prot_ret) {
1817                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, prot_ret);
1818                         return illegal_condition_result;
1819                 }
1820         }
1821
1822         read_lock_irqsave(&atomic_rw, iflags);
1823         ret = do_device_access(SCpnt, devip, lba, num, 0);
1824         read_unlock_irqrestore(&atomic_rw, iflags);
1825         return ret;
1826 }
1827
1828 void dump_sector(unsigned char *buf, int len)
1829 {
1830         int i, j;
1831
1832         printk(KERN_ERR ">>> Sector Dump <<<\n");
1833
1834         for (i = 0 ; i < len ; i += 16) {
1835                 printk(KERN_ERR "%04d: ", i);
1836
1837                 for (j = 0 ; j < 16 ; j++) {
1838                         unsigned char c = buf[i+j];
1839                         if (c >= 0x20 && c < 0x7e)
1840                                 printk(" %c ", buf[i+j]);
1841                         else
1842                                 printk("%02x ", buf[i+j]);
1843                 }
1844
1845                 printk("\n");
1846         }
1847 }
1848
1849 static int prot_verify_write(struct scsi_cmnd *SCpnt, sector_t start_sec,
1850                              unsigned int sectors, u32 ei_lba)
1851 {
1852         int i, j, ret;
1853         struct sd_dif_tuple *sdt;
1854         struct scatterlist *dsgl = scsi_sglist(SCpnt);
1855         struct scatterlist *psgl = scsi_prot_sglist(SCpnt);
1856         void *daddr, *paddr;
1857         sector_t tmp_sec = start_sec;
1858         sector_t sector;
1859         int ppage_offset;
1860         unsigned short csum;
1861
1862         sector = do_div(tmp_sec, sdebug_store_sectors);
1863
1864         BUG_ON(scsi_sg_count(SCpnt) == 0);
1865         BUG_ON(scsi_prot_sg_count(SCpnt) == 0);
1866
1867         paddr = kmap_atomic(sg_page(psgl), KM_IRQ1) + psgl->offset;
1868         ppage_offset = 0;
1869
1870         /* For each data page */
1871         scsi_for_each_sg(SCpnt, dsgl, scsi_sg_count(SCpnt), i) {
1872                 daddr = kmap_atomic(sg_page(dsgl), KM_IRQ0) + dsgl->offset;
1873
1874                 /* For each sector-sized chunk in data page */
1875                 for (j = 0 ; j < dsgl->length ; j += scsi_debug_sector_size) {
1876
1877                         /* If we're at the end of the current
1878                          * protection page advance to the next one
1879                          */
1880                         if (ppage_offset >= psgl->length) {
1881                                 kunmap_atomic(paddr, KM_IRQ1);
1882                                 psgl = sg_next(psgl);
1883                                 BUG_ON(psgl == NULL);
1884                                 paddr = kmap_atomic(sg_page(psgl), KM_IRQ1)
1885                                         + psgl->offset;
1886                                 ppage_offset = 0;
1887                         }
1888
1889                         sdt = paddr + ppage_offset;
1890
1891                         switch (scsi_debug_guard) {
1892                         case 1:
1893                                 csum = ip_compute_csum(daddr,
1894                                                        scsi_debug_sector_size);
1895                                 break;
1896                         case 0:
1897                                 csum = cpu_to_be16(crc_t10dif(daddr,
1898                                                       scsi_debug_sector_size));
1899                                 break;
1900                         default:
1901                                 BUG();
1902                                 ret = 0;
1903                                 goto out;
1904                         }
1905
1906                         if (sdt->guard_tag != csum) {
1907                                 printk(KERN_ERR
1908                                        "%s: GUARD check failed on sector %lu " \
1909                                        "rcvd 0x%04x, calculated 0x%04x\n",
1910                                        __func__, (unsigned long)sector,
1911                                        be16_to_cpu(sdt->guard_tag),
1912                                        be16_to_cpu(csum));
1913                                 ret = 0x01;
1914                                 dump_sector(daddr, scsi_debug_sector_size);
1915                                 goto out;
1916                         }
1917
1918                         if (scsi_debug_dif == SD_DIF_TYPE1_PROTECTION &&
1919                             be32_to_cpu(sdt->ref_tag)
1920                             != (start_sec & 0xffffffff)) {
1921                                 printk(KERN_ERR
1922                                        "%s: REF check failed on sector %lu\n",
1923                                        __func__, (unsigned long)sector);
1924                                 ret = 0x03;
1925                                 dump_sector(daddr, scsi_debug_sector_size);
1926                                 goto out;
1927                         }
1928
1929                         if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
1930                             be32_to_cpu(sdt->ref_tag) != ei_lba) {
1931                                 printk(KERN_ERR
1932                                        "%s: REF check failed on sector %lu\n",
1933                                        __func__, (unsigned long)sector);
1934                                 ret = 0x03;
1935                                 dump_sector(daddr, scsi_debug_sector_size);
1936                                 goto out;
1937                         }
1938
1939                         /* Would be great to copy this in bigger
1940                          * chunks.  However, for the sake of
1941                          * correctness we need to verify each sector
1942                          * before writing it to "stable" storage
1943                          */
1944                         memcpy(dif_storep + dif_offset(sector), sdt, 8);
1945
1946                         sector++;
1947
1948                         if (sector == sdebug_store_sectors)
1949                                 sector = 0;     /* Force wrap */
1950
1951                         start_sec++;
1952                         ei_lba++;
1953                         daddr += scsi_debug_sector_size;
1954                         ppage_offset += sizeof(struct sd_dif_tuple);
1955                 }
1956
1957                 kunmap_atomic(daddr, KM_IRQ0);
1958         }
1959
1960         kunmap_atomic(paddr, KM_IRQ1);
1961
1962         dix_writes++;
1963
1964         return 0;
1965
1966 out:
1967         dif_errors++;
1968         kunmap_atomic(daddr, KM_IRQ0);
1969         kunmap_atomic(paddr, KM_IRQ1);
1970         return ret;
1971 }
1972
1973 static unsigned int map_state(sector_t lba, unsigned int *num)
1974 {
1975         unsigned int granularity, alignment, mapped;
1976         sector_t block, next, end;
1977
1978         granularity = scsi_debug_unmap_granularity;
1979         alignment = granularity - scsi_debug_unmap_alignment;
1980         block = lba + alignment;
1981         do_div(block, granularity);
1982
1983         mapped = test_bit(block, map_storep);
1984
1985         if (mapped)
1986                 next = find_next_zero_bit(map_storep, map_size, block);
1987         else
1988                 next = find_next_bit(map_storep, map_size, block);
1989
1990         end = next * granularity - scsi_debug_unmap_alignment;
1991         *num = end - lba;
1992
1993         return mapped;
1994 }
1995
1996 static void map_region(sector_t lba, unsigned int len)
1997 {
1998         unsigned int granularity, alignment;
1999         sector_t end = lba + len;
2000
2001         granularity = scsi_debug_unmap_granularity;
2002         alignment = granularity - scsi_debug_unmap_alignment;
2003
2004         while (lba < end) {
2005                 sector_t block, rem;
2006
2007                 block = lba + alignment;
2008                 rem = do_div(block, granularity);
2009
2010                 if (block < map_size)
2011                         set_bit(block, map_storep);
2012
2013                 lba += granularity - rem;
2014         }
2015 }
2016
2017 static void unmap_region(sector_t lba, unsigned int len)
2018 {
2019         unsigned int granularity, alignment;
2020         sector_t end = lba + len;
2021
2022         granularity = scsi_debug_unmap_granularity;
2023         alignment = granularity - scsi_debug_unmap_alignment;
2024
2025         while (lba < end) {
2026                 sector_t block, rem;
2027
2028                 block = lba + alignment;
2029                 rem = do_div(block, granularity);
2030
2031                 if (rem == 0 && lba + granularity <= end &&
2032                     block < map_size)
2033                         clear_bit(block, map_storep);
2034
2035                 lba += granularity - rem;
2036         }
2037 }
2038
2039 static int resp_write(struct scsi_cmnd *SCpnt, unsigned long long lba,
2040                       unsigned int num, struct sdebug_dev_info *devip,
2041                       u32 ei_lba)
2042 {
2043         unsigned long iflags;
2044         int ret;
2045
2046         ret = check_device_access_params(devip, lba, num);
2047         if (ret)
2048                 return ret;
2049
2050         /* DIX + T10 DIF */
2051         if (scsi_debug_dix && scsi_prot_sg_count(SCpnt)) {
2052                 int prot_ret = prot_verify_write(SCpnt, lba, num, ei_lba);
2053
2054                 if (prot_ret) {
2055                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, prot_ret);
2056                         return illegal_condition_result;
2057                 }
2058         }
2059
2060         write_lock_irqsave(&atomic_rw, iflags);
2061         ret = do_device_access(SCpnt, devip, lba, num, 1);
2062         if (scsi_debug_unmap_granularity)
2063                 map_region(lba, num);
2064         write_unlock_irqrestore(&atomic_rw, iflags);
2065         if (-1 == ret)
2066                 return (DID_ERROR << 16);
2067         else if ((ret < (num * scsi_debug_sector_size)) &&
2068                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2069                 printk(KERN_INFO "scsi_debug: write: cdb indicated=%u, "
2070                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2071
2072         return 0;
2073 }
2074
2075 static int resp_write_same(struct scsi_cmnd *scmd, unsigned long long lba,
2076                       unsigned int num, struct sdebug_dev_info *devip,
2077                            u32 ei_lba, unsigned int unmap)
2078 {
2079         unsigned long iflags;
2080         unsigned long long i;
2081         int ret;
2082
2083         ret = check_device_access_params(devip, lba, num);
2084         if (ret)
2085                 return ret;
2086
2087         write_lock_irqsave(&atomic_rw, iflags);
2088
2089         if (unmap && scsi_debug_unmap_granularity) {
2090                 unmap_region(lba, num);
2091                 goto out;
2092         }
2093
2094         /* Else fetch one logical block */
2095         ret = fetch_to_dev_buffer(scmd,
2096                                   fake_storep + (lba * scsi_debug_sector_size),
2097                                   scsi_debug_sector_size);
2098
2099         if (-1 == ret) {
2100                 write_unlock_irqrestore(&atomic_rw, iflags);
2101                 return (DID_ERROR << 16);
2102         } else if ((ret < (num * scsi_debug_sector_size)) &&
2103                  (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts))
2104                 printk(KERN_INFO "scsi_debug: write same: cdb indicated=%u, "
2105                        " IO sent=%d bytes\n", num * scsi_debug_sector_size, ret);
2106
2107         /* Copy first sector to remaining blocks */
2108         for (i = 1 ; i < num ; i++)
2109                 memcpy(fake_storep + ((lba + i) * scsi_debug_sector_size),
2110                        fake_storep + (lba * scsi_debug_sector_size),
2111                        scsi_debug_sector_size);
2112
2113         if (scsi_debug_unmap_granularity)
2114                 map_region(lba, num);
2115 out:
2116         write_unlock_irqrestore(&atomic_rw, iflags);
2117
2118         return 0;
2119 }
2120
2121 struct unmap_block_desc {
2122         __be64  lba;
2123         __be32  blocks;
2124         __be32  __reserved;
2125 };
2126
2127 static int resp_unmap(struct scsi_cmnd * scmd, struct sdebug_dev_info * devip)
2128 {
2129         unsigned char *buf;
2130         struct unmap_block_desc *desc;
2131         unsigned int i, payload_len, descriptors;
2132         int ret;
2133
2134         ret = check_readiness(scmd, 1, devip);
2135         if (ret)
2136                 return ret;
2137
2138         payload_len = get_unaligned_be16(&scmd->cmnd[7]);
2139         BUG_ON(scsi_bufflen(scmd) != payload_len);
2140
2141         descriptors = (payload_len - 8) / 16;
2142
2143         buf = kmalloc(scsi_bufflen(scmd), GFP_ATOMIC);
2144         if (!buf)
2145                 return check_condition_result;
2146
2147         scsi_sg_copy_to_buffer(scmd, buf, scsi_bufflen(scmd));
2148
2149         BUG_ON(get_unaligned_be16(&buf[0]) != payload_len - 2);
2150         BUG_ON(get_unaligned_be16(&buf[2]) != descriptors * 16);
2151
2152         desc = (void *)&buf[8];
2153
2154         for (i = 0 ; i < descriptors ; i++) {
2155                 unsigned long long lba = get_unaligned_be64(&desc[i].lba);
2156                 unsigned int num = get_unaligned_be32(&desc[i].blocks);
2157
2158                 ret = check_device_access_params(devip, lba, num);
2159                 if (ret)
2160                         goto out;
2161
2162                 unmap_region(lba, num);
2163         }
2164
2165         ret = 0;
2166
2167 out:
2168         kfree(buf);
2169
2170         return ret;
2171 }
2172
2173 #define SDEBUG_GET_LBA_STATUS_LEN 32
2174
2175 static int resp_get_lba_status(struct scsi_cmnd * scmd,
2176                                struct sdebug_dev_info * devip)
2177 {
2178         unsigned long long lba;
2179         unsigned int alloc_len, mapped, num;
2180         unsigned char arr[SDEBUG_GET_LBA_STATUS_LEN];
2181         int ret;
2182
2183         ret = check_readiness(scmd, 1, devip);
2184         if (ret)
2185                 return ret;
2186
2187         lba = get_unaligned_be64(&scmd->cmnd[2]);
2188         alloc_len = get_unaligned_be32(&scmd->cmnd[10]);
2189
2190         if (alloc_len < 24)
2191                 return 0;
2192
2193         ret = check_device_access_params(devip, lba, 1);
2194         if (ret)
2195                 return ret;
2196
2197         mapped = map_state(lba, &num);
2198
2199         memset(arr, 0, SDEBUG_GET_LBA_STATUS_LEN);
2200         put_unaligned_be32(16, &arr[0]);        /* Parameter Data Length */
2201         put_unaligned_be64(lba, &arr[8]);       /* LBA */
2202         put_unaligned_be32(num, &arr[16]);      /* Number of blocks */
2203         arr[20] = !mapped;                      /* mapped = 0, unmapped = 1 */
2204
2205         return fill_from_dev_buffer(scmd, arr, SDEBUG_GET_LBA_STATUS_LEN);
2206 }
2207
2208 #define SDEBUG_RLUN_ARR_SZ 256
2209
2210 static int resp_report_luns(struct scsi_cmnd * scp,
2211                             struct sdebug_dev_info * devip)
2212 {
2213         unsigned int alloc_len;
2214         int lun_cnt, i, upper, num, n, wlun, lun;
2215         unsigned char *cmd = (unsigned char *)scp->cmnd;
2216         int select_report = (int)cmd[2];
2217         struct scsi_lun *one_lun;
2218         unsigned char arr[SDEBUG_RLUN_ARR_SZ];
2219         unsigned char * max_addr;
2220
2221         alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
2222         if ((alloc_len < 4) || (select_report > 2)) {
2223                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_FIELD_IN_CDB,
2224                                 0);
2225                 return check_condition_result;
2226         }
2227         /* can produce response with up to 16k luns (lun 0 to lun 16383) */
2228         memset(arr, 0, SDEBUG_RLUN_ARR_SZ);
2229         lun_cnt = scsi_debug_max_luns;
2230         if (1 == select_report)
2231                 lun_cnt = 0;
2232         else if (scsi_debug_no_lun_0 && (lun_cnt > 0))
2233                 --lun_cnt;
2234         wlun = (select_report > 0) ? 1 : 0;
2235         num = lun_cnt + wlun;
2236         arr[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
2237         arr[3] = (sizeof(struct scsi_lun) * num) & 0xff;
2238         n = min((int)((SDEBUG_RLUN_ARR_SZ - 8) /
2239                             sizeof(struct scsi_lun)), num);
2240         if (n < num) {
2241                 wlun = 0;
2242                 lun_cnt = n;
2243         }
2244         one_lun = (struct scsi_lun *) &arr[8];
2245         max_addr = arr + SDEBUG_RLUN_ARR_SZ;
2246         for (i = 0, lun = (scsi_debug_no_lun_0 ? 1 : 0);
2247              ((i < lun_cnt) && ((unsigned char *)(one_lun + i) < max_addr));
2248              i++, lun++) {
2249                 upper = (lun >> 8) & 0x3f;
2250                 if (upper)
2251                         one_lun[i].scsi_lun[0] =
2252                             (upper | (SAM2_LUN_ADDRESS_METHOD << 6));
2253                 one_lun[i].scsi_lun[1] = lun & 0xff;
2254         }
2255         if (wlun) {
2256                 one_lun[i].scsi_lun[0] = (SAM2_WLUN_REPORT_LUNS >> 8) & 0xff;
2257                 one_lun[i].scsi_lun[1] = SAM2_WLUN_REPORT_LUNS & 0xff;
2258                 i++;
2259         }
2260         alloc_len = (unsigned char *)(one_lun + i) - arr;
2261         return fill_from_dev_buffer(scp, arr,
2262                                     min((int)alloc_len, SDEBUG_RLUN_ARR_SZ));
2263 }
2264
2265 static int resp_xdwriteread(struct scsi_cmnd *scp, unsigned long long lba,
2266                             unsigned int num, struct sdebug_dev_info *devip)
2267 {
2268         int i, j, ret = -1;
2269         unsigned char *kaddr, *buf;
2270         unsigned int offset;
2271         struct scatterlist *sg;
2272         struct scsi_data_buffer *sdb = scsi_in(scp);
2273
2274         /* better not to use temporary buffer. */
2275         buf = kmalloc(scsi_bufflen(scp), GFP_ATOMIC);
2276         if (!buf)
2277                 return ret;
2278
2279         scsi_sg_copy_to_buffer(scp, buf, scsi_bufflen(scp));
2280
2281         offset = 0;
2282         for_each_sg(sdb->table.sgl, sg, sdb->table.nents, i) {
2283                 kaddr = (unsigned char *)kmap_atomic(sg_page(sg), KM_USER0);
2284                 if (!kaddr)
2285                         goto out;
2286
2287                 for (j = 0; j < sg->length; j++)
2288                         *(kaddr + sg->offset + j) ^= *(buf + offset + j);
2289
2290                 offset += sg->length;
2291                 kunmap_atomic(kaddr, KM_USER0);
2292         }
2293         ret = 0;
2294 out:
2295         kfree(buf);
2296
2297         return ret;
2298 }
2299
2300 /* When timer goes off this function is called. */
2301 static void timer_intr_handler(unsigned long indx)
2302 {
2303         struct sdebug_queued_cmd * sqcp;
2304         unsigned long iflags;
2305
2306         if (indx >= scsi_debug_max_queue) {
2307                 printk(KERN_ERR "scsi_debug:timer_intr_handler: indx too "
2308                        "large\n");
2309                 return;
2310         }
2311         spin_lock_irqsave(&queued_arr_lock, iflags);
2312         sqcp = &queued_arr[(int)indx];
2313         if (! sqcp->in_use) {
2314                 printk(KERN_ERR "scsi_debug:timer_intr_handler: Unexpected "
2315                        "interrupt\n");
2316                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2317                 return;
2318         }
2319         sqcp->in_use = 0;
2320         if (sqcp->done_funct) {
2321                 sqcp->a_cmnd->result = sqcp->scsi_result;
2322                 sqcp->done_funct(sqcp->a_cmnd); /* callback to mid level */
2323         }
2324         sqcp->done_funct = NULL;
2325         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2326 }
2327
2328
2329 static struct sdebug_dev_info *
2330 sdebug_device_create(struct sdebug_host_info *sdbg_host, gfp_t flags)
2331 {
2332         struct sdebug_dev_info *devip;
2333
2334         devip = kzalloc(sizeof(*devip), flags);
2335         if (devip) {
2336                 devip->sdbg_host = sdbg_host;
2337                 list_add_tail(&devip->dev_list, &sdbg_host->dev_info_list);
2338         }
2339         return devip;
2340 }
2341
2342 static struct sdebug_dev_info * devInfoReg(struct scsi_device * sdev)
2343 {
2344         struct sdebug_host_info * sdbg_host;
2345         struct sdebug_dev_info * open_devip = NULL;
2346         struct sdebug_dev_info * devip =
2347                         (struct sdebug_dev_info *)sdev->hostdata;
2348
2349         if (devip)
2350                 return devip;
2351         sdbg_host = *(struct sdebug_host_info **)shost_priv(sdev->host);
2352         if (!sdbg_host) {
2353                 printk(KERN_ERR "Host info NULL\n");
2354                 return NULL;
2355         }
2356         list_for_each_entry(devip, &sdbg_host->dev_info_list, dev_list) {
2357                 if ((devip->used) && (devip->channel == sdev->channel) &&
2358                     (devip->target == sdev->id) &&
2359                     (devip->lun == sdev->lun))
2360                         return devip;
2361                 else {
2362                         if ((!devip->used) && (!open_devip))
2363                                 open_devip = devip;
2364                 }
2365         }
2366         if (!open_devip) { /* try and make a new one */
2367                 open_devip = sdebug_device_create(sdbg_host, GFP_ATOMIC);
2368                 if (!open_devip) {
2369                         printk(KERN_ERR "%s: out of memory at line %d\n",
2370                                 __func__, __LINE__);
2371                         return NULL;
2372                 }
2373         }
2374
2375         open_devip->channel = sdev->channel;
2376         open_devip->target = sdev->id;
2377         open_devip->lun = sdev->lun;
2378         open_devip->sdbg_host = sdbg_host;
2379         open_devip->reset = 1;
2380         open_devip->used = 1;
2381         memset(open_devip->sense_buff, 0, SDEBUG_SENSE_LEN);
2382         if (scsi_debug_dsense)
2383                 open_devip->sense_buff[0] = 0x72;
2384         else {
2385                 open_devip->sense_buff[0] = 0x70;
2386                 open_devip->sense_buff[7] = 0xa;
2387         }
2388         if (sdev->lun == SAM2_WLUN_REPORT_LUNS)
2389                 open_devip->wlun = SAM2_WLUN_REPORT_LUNS & 0xff;
2390
2391         return open_devip;
2392 }
2393
2394 static int scsi_debug_slave_alloc(struct scsi_device *sdp)
2395 {
2396         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2397                 printk(KERN_INFO "scsi_debug: slave_alloc <%u %u %u %u>\n",
2398                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2399         queue_flag_set_unlocked(QUEUE_FLAG_BIDI, sdp->request_queue);
2400         return 0;
2401 }
2402
2403 static int scsi_debug_slave_configure(struct scsi_device *sdp)
2404 {
2405         struct sdebug_dev_info *devip;
2406
2407         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2408                 printk(KERN_INFO "scsi_debug: slave_configure <%u %u %u %u>\n",
2409                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2410         if (sdp->host->max_cmd_len != SCSI_DEBUG_MAX_CMD_LEN)
2411                 sdp->host->max_cmd_len = SCSI_DEBUG_MAX_CMD_LEN;
2412         devip = devInfoReg(sdp);
2413         if (NULL == devip)
2414                 return 1;       /* no resources, will be marked offline */
2415         sdp->hostdata = devip;
2416         if (sdp->host->cmd_per_lun)
2417                 scsi_adjust_queue_depth(sdp, SDEBUG_TAGGED_QUEUING,
2418                                         sdp->host->cmd_per_lun);
2419         blk_queue_max_segment_size(sdp->request_queue, 256 * 1024);
2420         if (scsi_debug_no_uld)
2421                 sdp->no_uld_attach = 1;
2422         return 0;
2423 }
2424
2425 static void scsi_debug_slave_destroy(struct scsi_device *sdp)
2426 {
2427         struct sdebug_dev_info *devip =
2428                 (struct sdebug_dev_info *)sdp->hostdata;
2429
2430         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2431                 printk(KERN_INFO "scsi_debug: slave_destroy <%u %u %u %u>\n",
2432                        sdp->host->host_no, sdp->channel, sdp->id, sdp->lun);
2433         if (devip) {
2434                 /* make this slot avaliable for re-use */
2435                 devip->used = 0;
2436                 sdp->hostdata = NULL;
2437         }
2438 }
2439
2440 /* Returns 1 if found 'cmnd' and deleted its timer. else returns 0 */
2441 static int stop_queued_cmnd(struct scsi_cmnd *cmnd)
2442 {
2443         unsigned long iflags;
2444         int k;
2445         struct sdebug_queued_cmd *sqcp;
2446
2447         spin_lock_irqsave(&queued_arr_lock, iflags);
2448         for (k = 0; k < scsi_debug_max_queue; ++k) {
2449                 sqcp = &queued_arr[k];
2450                 if (sqcp->in_use && (cmnd == sqcp->a_cmnd)) {
2451                         del_timer_sync(&sqcp->cmnd_timer);
2452                         sqcp->in_use = 0;
2453                         sqcp->a_cmnd = NULL;
2454                         break;
2455                 }
2456         }
2457         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2458         return (k < scsi_debug_max_queue) ? 1 : 0;
2459 }
2460
2461 /* Deletes (stops) timers of all queued commands */
2462 static void stop_all_queued(void)
2463 {
2464         unsigned long iflags;
2465         int k;
2466         struct sdebug_queued_cmd *sqcp;
2467
2468         spin_lock_irqsave(&queued_arr_lock, iflags);
2469         for (k = 0; k < scsi_debug_max_queue; ++k) {
2470                 sqcp = &queued_arr[k];
2471                 if (sqcp->in_use && sqcp->a_cmnd) {
2472                         del_timer_sync(&sqcp->cmnd_timer);
2473                         sqcp->in_use = 0;
2474                         sqcp->a_cmnd = NULL;
2475                 }
2476         }
2477         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2478 }
2479
2480 static int scsi_debug_abort(struct scsi_cmnd * SCpnt)
2481 {
2482         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2483                 printk(KERN_INFO "scsi_debug: abort\n");
2484         ++num_aborts;
2485         stop_queued_cmnd(SCpnt);
2486         return SUCCESS;
2487 }
2488
2489 static int scsi_debug_biosparam(struct scsi_device *sdev,
2490                 struct block_device * bdev, sector_t capacity, int *info)
2491 {
2492         int res;
2493         unsigned char *buf;
2494
2495         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2496                 printk(KERN_INFO "scsi_debug: biosparam\n");
2497         buf = scsi_bios_ptable(bdev);
2498         if (buf) {
2499                 res = scsi_partsize(buf, capacity,
2500                                     &info[2], &info[0], &info[1]);
2501                 kfree(buf);
2502                 if (! res)
2503                         return res;
2504         }
2505         info[0] = sdebug_heads;
2506         info[1] = sdebug_sectors_per;
2507         info[2] = sdebug_cylinders_per;
2508         return 0;
2509 }
2510
2511 static int scsi_debug_device_reset(struct scsi_cmnd * SCpnt)
2512 {
2513         struct sdebug_dev_info * devip;
2514
2515         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2516                 printk(KERN_INFO "scsi_debug: device_reset\n");
2517         ++num_dev_resets;
2518         if (SCpnt) {
2519                 devip = devInfoReg(SCpnt->device);
2520                 if (devip)
2521                         devip->reset = 1;
2522         }
2523         return SUCCESS;
2524 }
2525
2526 static int scsi_debug_bus_reset(struct scsi_cmnd * SCpnt)
2527 {
2528         struct sdebug_host_info *sdbg_host;
2529         struct sdebug_dev_info * dev_info;
2530         struct scsi_device * sdp;
2531         struct Scsi_Host * hp;
2532
2533         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2534                 printk(KERN_INFO "scsi_debug: bus_reset\n");
2535         ++num_bus_resets;
2536         if (SCpnt && ((sdp = SCpnt->device)) && ((hp = sdp->host))) {
2537                 sdbg_host = *(struct sdebug_host_info **)shost_priv(hp);
2538                 if (sdbg_host) {
2539                         list_for_each_entry(dev_info,
2540                                             &sdbg_host->dev_info_list,
2541                                             dev_list)
2542                                 dev_info->reset = 1;
2543                 }
2544         }
2545         return SUCCESS;
2546 }
2547
2548 static int scsi_debug_host_reset(struct scsi_cmnd * SCpnt)
2549 {
2550         struct sdebug_host_info * sdbg_host;
2551         struct sdebug_dev_info * dev_info;
2552
2553         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
2554                 printk(KERN_INFO "scsi_debug: host_reset\n");
2555         ++num_host_resets;
2556         spin_lock(&sdebug_host_list_lock);
2557         list_for_each_entry(sdbg_host, &sdebug_host_list, host_list) {
2558                 list_for_each_entry(dev_info, &sdbg_host->dev_info_list,
2559                                     dev_list)
2560                         dev_info->reset = 1;
2561         }
2562         spin_unlock(&sdebug_host_list_lock);
2563         stop_all_queued();
2564         return SUCCESS;
2565 }
2566
2567 /* Initializes timers in queued array */
2568 static void __init init_all_queued(void)
2569 {
2570         unsigned long iflags;
2571         int k;
2572         struct sdebug_queued_cmd * sqcp;
2573
2574         spin_lock_irqsave(&queued_arr_lock, iflags);
2575         for (k = 0; k < scsi_debug_max_queue; ++k) {
2576                 sqcp = &queued_arr[k];
2577                 init_timer(&sqcp->cmnd_timer);
2578                 sqcp->in_use = 0;
2579                 sqcp->a_cmnd = NULL;
2580         }
2581         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2582 }
2583
2584 static void __init sdebug_build_parts(unsigned char *ramp,
2585                                       unsigned long store_size)
2586 {
2587         struct partition * pp;
2588         int starts[SDEBUG_MAX_PARTS + 2];
2589         int sectors_per_part, num_sectors, k;
2590         int heads_by_sects, start_sec, end_sec;
2591
2592         /* assume partition table already zeroed */
2593         if ((scsi_debug_num_parts < 1) || (store_size < 1048576))
2594                 return;
2595         if (scsi_debug_num_parts > SDEBUG_MAX_PARTS) {
2596                 scsi_debug_num_parts = SDEBUG_MAX_PARTS;
2597                 printk(KERN_WARNING "scsi_debug:build_parts: reducing "
2598                                     "partitions to %d\n", SDEBUG_MAX_PARTS);
2599         }
2600         num_sectors = (int)sdebug_store_sectors;
2601         sectors_per_part = (num_sectors - sdebug_sectors_per)
2602                            / scsi_debug_num_parts;
2603         heads_by_sects = sdebug_heads * sdebug_sectors_per;
2604         starts[0] = sdebug_sectors_per;
2605         for (k = 1; k < scsi_debug_num_parts; ++k)
2606                 starts[k] = ((k * sectors_per_part) / heads_by_sects)
2607                             * heads_by_sects;
2608         starts[scsi_debug_num_parts] = num_sectors;
2609         starts[scsi_debug_num_parts + 1] = 0;
2610
2611         ramp[510] = 0x55;       /* magic partition markings */
2612         ramp[511] = 0xAA;
2613         pp = (struct partition *)(ramp + 0x1be);
2614         for (k = 0; starts[k + 1]; ++k, ++pp) {
2615                 start_sec = starts[k];
2616                 end_sec = starts[k + 1] - 1;
2617                 pp->boot_ind = 0;
2618
2619                 pp->cyl = start_sec / heads_by_sects;
2620                 pp->head = (start_sec - (pp->cyl * heads_by_sects))
2621                            / sdebug_sectors_per;
2622                 pp->sector = (start_sec % sdebug_sectors_per) + 1;
2623
2624                 pp->end_cyl = end_sec / heads_by_sects;
2625                 pp->end_head = (end_sec - (pp->end_cyl * heads_by_sects))
2626                                / sdebug_sectors_per;
2627                 pp->end_sector = (end_sec % sdebug_sectors_per) + 1;
2628
2629                 pp->start_sect = start_sec;
2630                 pp->nr_sects = end_sec - start_sec + 1;
2631                 pp->sys_ind = 0x83;     /* plain Linux partition */
2632         }
2633 }
2634
2635 static int schedule_resp(struct scsi_cmnd * cmnd,
2636                          struct sdebug_dev_info * devip,
2637                          done_funct_t done, int scsi_result, int delta_jiff)
2638 {
2639         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmnd) {
2640                 if (scsi_result) {
2641                         struct scsi_device * sdp = cmnd->device;
2642
2643                         printk(KERN_INFO "scsi_debug:    <%u %u %u %u> "
2644                                "non-zero result=0x%x\n", sdp->host->host_no,
2645                                sdp->channel, sdp->id, sdp->lun, scsi_result);
2646                 }
2647         }
2648         if (cmnd && devip) {
2649                 /* simulate autosense by this driver */
2650                 if (SAM_STAT_CHECK_CONDITION == (scsi_result & 0xff))
2651                         memcpy(cmnd->sense_buffer, devip->sense_buff,
2652                                (SCSI_SENSE_BUFFERSIZE > SDEBUG_SENSE_LEN) ?
2653                                SDEBUG_SENSE_LEN : SCSI_SENSE_BUFFERSIZE);
2654         }
2655         if (delta_jiff <= 0) {
2656                 if (cmnd)
2657                         cmnd->result = scsi_result;
2658                 if (done)
2659                         done(cmnd);
2660                 return 0;
2661         } else {
2662                 unsigned long iflags;
2663                 int k;
2664                 struct sdebug_queued_cmd * sqcp = NULL;
2665
2666                 spin_lock_irqsave(&queued_arr_lock, iflags);
2667                 for (k = 0; k < scsi_debug_max_queue; ++k) {
2668                         sqcp = &queued_arr[k];
2669                         if (! sqcp->in_use)
2670                                 break;
2671                 }
2672                 if (k >= scsi_debug_max_queue) {
2673                         spin_unlock_irqrestore(&queued_arr_lock, iflags);
2674                         printk(KERN_WARNING "scsi_debug: can_queue exceeded\n");
2675                         return 1;       /* report busy to mid level */
2676                 }
2677                 sqcp->in_use = 1;
2678                 sqcp->a_cmnd = cmnd;
2679                 sqcp->scsi_result = scsi_result;
2680                 sqcp->done_funct = done;
2681                 sqcp->cmnd_timer.function = timer_intr_handler;
2682                 sqcp->cmnd_timer.data = k;
2683                 sqcp->cmnd_timer.expires = jiffies + delta_jiff;
2684                 add_timer(&sqcp->cmnd_timer);
2685                 spin_unlock_irqrestore(&queued_arr_lock, iflags);
2686                 if (cmnd)
2687                         cmnd->result = 0;
2688                 return 0;
2689         }
2690 }
2691 /* Note: The following macros create attribute files in the
2692    /sys/module/scsi_debug/parameters directory. Unfortunately this
2693    driver is unaware of a change and cannot trigger auxiliary actions
2694    as it can when the corresponding attribute in the
2695    /sys/bus/pseudo/drivers/scsi_debug directory is changed.
2696  */
2697 module_param_named(add_host, scsi_debug_add_host, int, S_IRUGO | S_IWUSR);
2698 module_param_named(delay, scsi_debug_delay, int, S_IRUGO | S_IWUSR);
2699 module_param_named(dev_size_mb, scsi_debug_dev_size_mb, int, S_IRUGO);
2700 module_param_named(dsense, scsi_debug_dsense, int, S_IRUGO | S_IWUSR);
2701 module_param_named(every_nth, scsi_debug_every_nth, int, S_IRUGO | S_IWUSR);
2702 module_param_named(fake_rw, scsi_debug_fake_rw, int, S_IRUGO | S_IWUSR);
2703 module_param_named(max_luns, scsi_debug_max_luns, int, S_IRUGO | S_IWUSR);
2704 module_param_named(max_queue, scsi_debug_max_queue, int, S_IRUGO | S_IWUSR);
2705 module_param_named(no_lun_0, scsi_debug_no_lun_0, int, S_IRUGO | S_IWUSR);
2706 module_param_named(no_uld, scsi_debug_no_uld, int, S_IRUGO);
2707 module_param_named(num_parts, scsi_debug_num_parts, int, S_IRUGO);
2708 module_param_named(num_tgts, scsi_debug_num_tgts, int, S_IRUGO | S_IWUSR);
2709 module_param_named(opts, scsi_debug_opts, int, S_IRUGO | S_IWUSR);
2710 module_param_named(ptype, scsi_debug_ptype, int, S_IRUGO | S_IWUSR);
2711 module_param_named(scsi_level, scsi_debug_scsi_level, int, S_IRUGO);
2712 module_param_named(virtual_gb, scsi_debug_virtual_gb, int, S_IRUGO | S_IWUSR);
2713 module_param_named(vpd_use_hostno, scsi_debug_vpd_use_hostno, int,
2714                    S_IRUGO | S_IWUSR);
2715 module_param_named(sector_size, scsi_debug_sector_size, int, S_IRUGO);
2716 module_param_named(dix, scsi_debug_dix, int, S_IRUGO);
2717 module_param_named(dif, scsi_debug_dif, int, S_IRUGO);
2718 module_param_named(guard, scsi_debug_guard, int, S_IRUGO);
2719 module_param_named(ato, scsi_debug_ato, int, S_IRUGO);
2720 module_param_named(physblk_exp, scsi_debug_physblk_exp, int, S_IRUGO);
2721 module_param_named(opt_blks, scsi_debug_opt_blks, int, S_IRUGO);
2722 module_param_named(lowest_aligned, scsi_debug_lowest_aligned, int, S_IRUGO);
2723 module_param_named(unmap_max_blocks, scsi_debug_unmap_max_blocks, int, S_IRUGO);
2724 module_param_named(unmap_max_desc, scsi_debug_unmap_max_desc, int, S_IRUGO);
2725 module_param_named(unmap_granularity, scsi_debug_unmap_granularity, int, S_IRUGO);
2726 module_param_named(unmap_alignment, scsi_debug_unmap_alignment, int, S_IRUGO);
2727 module_param_named(tpu, scsi_debug_tpu, int, S_IRUGO);
2728 module_param_named(tpws, scsi_debug_tpws, int, S_IRUGO);
2729
2730 MODULE_AUTHOR("Eric Youngdale + Douglas Gilbert");
2731 MODULE_DESCRIPTION("SCSI debug adapter driver");
2732 MODULE_LICENSE("GPL");
2733 MODULE_VERSION(SCSI_DEBUG_VERSION);
2734
2735 MODULE_PARM_DESC(add_host, "0..127 hosts allowed(def=1)");
2736 MODULE_PARM_DESC(delay, "# of jiffies to delay response(def=1)");
2737 MODULE_PARM_DESC(dev_size_mb, "size in MB of ram shared by devs(def=8)");
2738 MODULE_PARM_DESC(dsense, "use descriptor sense format(def=0 -> fixed)");
2739 MODULE_PARM_DESC(every_nth, "timeout every nth command(def=0)");
2740 MODULE_PARM_DESC(fake_rw, "fake reads/writes instead of copying (def=0)");
2741 MODULE_PARM_DESC(max_luns, "number of LUNs per target to simulate(def=1)");
2742 MODULE_PARM_DESC(max_queue, "max number of queued commands (1 to 255(def))");
2743 MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
2744 MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
2745 MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
2746 MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
2747 MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
2748 MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");
2749 MODULE_PARM_DESC(scsi_level, "SCSI level to simulate(def=5[SPC-3])");
2750 MODULE_PARM_DESC(virtual_gb, "virtual gigabyte size (def=0 -> use dev_size_mb)");
2751 MODULE_PARM_DESC(vpd_use_hostno, "0 -> dev ids ignore hostno (def=1 -> unique dev ids)");
2752 MODULE_PARM_DESC(sector_size, "logical block size in bytes (def=512)");
2753 MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
2754 MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
2755 MODULE_PARM_DESC(lowest_aligned, "lowest aligned lba (def=0)");
2756 MODULE_PARM_DESC(dix, "data integrity extensions mask (def=0)");
2757 MODULE_PARM_DESC(dif, "data integrity field type: 0-3 (def=0)");
2758 MODULE_PARM_DESC(guard, "protection checksum: 0=crc, 1=ip (def=0)");
2759 MODULE_PARM_DESC(ato, "application tag ownership: 0=disk 1=host (def=1)");
2760 MODULE_PARM_DESC(unmap_max_blocks, "max # of blocks can be unmapped in one cmd (def=0xffffffff)");
2761 MODULE_PARM_DESC(unmap_max_desc, "max # of ranges that can be unmapped in one cmd (def=256)");
2762 MODULE_PARM_DESC(unmap_granularity, "thin provisioning granularity in blocks (def=1)");
2763 MODULE_PARM_DESC(unmap_alignment, "lowest aligned thin provisioning lba (def=0)");
2764 MODULE_PARM_DESC(tpu, "enable TP, support UNMAP command (def=0)");
2765 MODULE_PARM_DESC(tpws, "enable TP, support WRITE SAME(16) with UNMAP bit (def=0)");
2766
2767 static char sdebug_info[256];
2768
2769 static const char * scsi_debug_info(struct Scsi_Host * shp)
2770 {
2771         sprintf(sdebug_info, "scsi_debug, version %s [%s], "
2772                 "dev_size_mb=%d, opts=0x%x", SCSI_DEBUG_VERSION,
2773                 scsi_debug_version_date, scsi_debug_dev_size_mb,
2774                 scsi_debug_opts);
2775         return sdebug_info;
2776 }
2777
2778 /* scsi_debug_proc_info
2779  * Used if the driver currently has no own support for /proc/scsi
2780  */
2781 static int scsi_debug_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset,
2782                                 int length, int inout)
2783 {
2784         int len, pos, begin;
2785         int orig_length;
2786
2787         orig_length = length;
2788
2789         if (inout == 1) {
2790                 char arr[16];
2791                 int minLen = length > 15 ? 15 : length;
2792
2793                 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
2794                         return -EACCES;
2795                 memcpy(arr, buffer, minLen);
2796                 arr[minLen] = '\0';
2797                 if (1 != sscanf(arr, "%d", &pos))
2798                         return -EINVAL;
2799                 scsi_debug_opts = pos;
2800                 if (scsi_debug_every_nth != 0)
2801                         scsi_debug_cmnd_count = 0;
2802                 return length;
2803         }
2804         begin = 0;
2805         pos = len = sprintf(buffer, "scsi_debug adapter driver, version "
2806             "%s [%s]\n"
2807             "num_tgts=%d, shared (ram) size=%d MB, opts=0x%x, "
2808             "every_nth=%d(curr:%d)\n"
2809             "delay=%d, max_luns=%d, scsi_level=%d\n"
2810             "sector_size=%d bytes, cylinders=%d, heads=%d, sectors=%d\n"
2811             "number of aborts=%d, device_reset=%d, bus_resets=%d, "
2812             "host_resets=%d\ndix_reads=%d dix_writes=%d dif_errors=%d\n",
2813             SCSI_DEBUG_VERSION, scsi_debug_version_date, scsi_debug_num_tgts,
2814             scsi_debug_dev_size_mb, scsi_debug_opts, scsi_debug_every_nth,
2815             scsi_debug_cmnd_count, scsi_debug_delay,
2816             scsi_debug_max_luns, scsi_debug_scsi_level,
2817             scsi_debug_sector_size, sdebug_cylinders_per, sdebug_heads,
2818             sdebug_sectors_per, num_aborts, num_dev_resets, num_bus_resets,
2819             num_host_resets, dix_reads, dix_writes, dif_errors);
2820         if (pos < offset) {
2821                 len = 0;
2822                 begin = pos;
2823         }
2824         *start = buffer + (offset - begin);     /* Start of wanted data */
2825         len -= (offset - begin);
2826         if (len > length)
2827                 len = length;
2828         return len;
2829 }
2830
2831 static ssize_t sdebug_delay_show(struct device_driver * ddp, char * buf)
2832 {
2833         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_delay);
2834 }
2835
2836 static ssize_t sdebug_delay_store(struct device_driver * ddp,
2837                                   const char * buf, size_t count)
2838 {
2839         int delay;
2840         char work[20];
2841
2842         if (1 == sscanf(buf, "%10s", work)) {
2843                 if ((1 == sscanf(work, "%d", &delay)) && (delay >= 0)) {
2844                         scsi_debug_delay = delay;
2845                         return count;
2846                 }
2847         }
2848         return -EINVAL;
2849 }
2850 DRIVER_ATTR(delay, S_IRUGO | S_IWUSR, sdebug_delay_show,
2851             sdebug_delay_store);
2852
2853 static ssize_t sdebug_opts_show(struct device_driver * ddp, char * buf)
2854 {
2855         return scnprintf(buf, PAGE_SIZE, "0x%x\n", scsi_debug_opts);
2856 }
2857
2858 static ssize_t sdebug_opts_store(struct device_driver * ddp,
2859                                  const char * buf, size_t count)
2860 {
2861         int opts;
2862         char work[20];
2863
2864         if (1 == sscanf(buf, "%10s", work)) {
2865                 if (0 == strnicmp(work,"0x", 2)) {
2866                         if (1 == sscanf(&work[2], "%x", &opts))
2867                                 goto opts_done;
2868                 } else {
2869                         if (1 == sscanf(work, "%d", &opts))
2870                                 goto opts_done;
2871                 }
2872         }
2873         return -EINVAL;
2874 opts_done:
2875         scsi_debug_opts = opts;
2876         scsi_debug_cmnd_count = 0;
2877         return count;
2878 }
2879 DRIVER_ATTR(opts, S_IRUGO | S_IWUSR, sdebug_opts_show,
2880             sdebug_opts_store);
2881
2882 static ssize_t sdebug_ptype_show(struct device_driver * ddp, char * buf)
2883 {
2884         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ptype);
2885 }
2886 static ssize_t sdebug_ptype_store(struct device_driver * ddp,
2887                                   const char * buf, size_t count)
2888 {
2889         int n;
2890
2891         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2892                 scsi_debug_ptype = n;
2893                 return count;
2894         }
2895         return -EINVAL;
2896 }
2897 DRIVER_ATTR(ptype, S_IRUGO | S_IWUSR, sdebug_ptype_show, sdebug_ptype_store);
2898
2899 static ssize_t sdebug_dsense_show(struct device_driver * ddp, char * buf)
2900 {
2901         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dsense);
2902 }
2903 static ssize_t sdebug_dsense_store(struct device_driver * ddp,
2904                                   const char * buf, size_t count)
2905 {
2906         int n;
2907
2908         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2909                 scsi_debug_dsense = n;
2910                 return count;
2911         }
2912         return -EINVAL;
2913 }
2914 DRIVER_ATTR(dsense, S_IRUGO | S_IWUSR, sdebug_dsense_show,
2915             sdebug_dsense_store);
2916
2917 static ssize_t sdebug_fake_rw_show(struct device_driver * ddp, char * buf)
2918 {
2919         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_fake_rw);
2920 }
2921 static ssize_t sdebug_fake_rw_store(struct device_driver * ddp,
2922                                     const char * buf, size_t count)
2923 {
2924         int n;
2925
2926         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2927                 scsi_debug_fake_rw = n;
2928                 return count;
2929         }
2930         return -EINVAL;
2931 }
2932 DRIVER_ATTR(fake_rw, S_IRUGO | S_IWUSR, sdebug_fake_rw_show,
2933             sdebug_fake_rw_store);
2934
2935 static ssize_t sdebug_no_lun_0_show(struct device_driver * ddp, char * buf)
2936 {
2937         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_lun_0);
2938 }
2939 static ssize_t sdebug_no_lun_0_store(struct device_driver * ddp,
2940                                      const char * buf, size_t count)
2941 {
2942         int n;
2943
2944         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2945                 scsi_debug_no_lun_0 = n;
2946                 return count;
2947         }
2948         return -EINVAL;
2949 }
2950 DRIVER_ATTR(no_lun_0, S_IRUGO | S_IWUSR, sdebug_no_lun_0_show,
2951             sdebug_no_lun_0_store);
2952
2953 static ssize_t sdebug_num_tgts_show(struct device_driver * ddp, char * buf)
2954 {
2955         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_tgts);
2956 }
2957 static ssize_t sdebug_num_tgts_store(struct device_driver * ddp,
2958                                      const char * buf, size_t count)
2959 {
2960         int n;
2961
2962         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
2963                 scsi_debug_num_tgts = n;
2964                 sdebug_max_tgts_luns();
2965                 return count;
2966         }
2967         return -EINVAL;
2968 }
2969 DRIVER_ATTR(num_tgts, S_IRUGO | S_IWUSR, sdebug_num_tgts_show,
2970             sdebug_num_tgts_store);
2971
2972 static ssize_t sdebug_dev_size_mb_show(struct device_driver * ddp, char * buf)
2973 {
2974         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dev_size_mb);
2975 }
2976 DRIVER_ATTR(dev_size_mb, S_IRUGO, sdebug_dev_size_mb_show, NULL);
2977
2978 static ssize_t sdebug_num_parts_show(struct device_driver * ddp, char * buf)
2979 {
2980         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_num_parts);
2981 }
2982 DRIVER_ATTR(num_parts, S_IRUGO, sdebug_num_parts_show, NULL);
2983
2984 static ssize_t sdebug_every_nth_show(struct device_driver * ddp, char * buf)
2985 {
2986         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_every_nth);
2987 }
2988 static ssize_t sdebug_every_nth_store(struct device_driver * ddp,
2989                                       const char * buf, size_t count)
2990 {
2991         int nth;
2992
2993         if ((count > 0) && (1 == sscanf(buf, "%d", &nth))) {
2994                 scsi_debug_every_nth = nth;
2995                 scsi_debug_cmnd_count = 0;
2996                 return count;
2997         }
2998         return -EINVAL;
2999 }
3000 DRIVER_ATTR(every_nth, S_IRUGO | S_IWUSR, sdebug_every_nth_show,
3001             sdebug_every_nth_store);
3002
3003 static ssize_t sdebug_max_luns_show(struct device_driver * ddp, char * buf)
3004 {
3005         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_luns);
3006 }
3007 static ssize_t sdebug_max_luns_store(struct device_driver * ddp,
3008                                      const char * buf, size_t count)
3009 {
3010         int n;
3011
3012         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3013                 scsi_debug_max_luns = n;
3014                 sdebug_max_tgts_luns();
3015                 return count;
3016         }
3017         return -EINVAL;
3018 }
3019 DRIVER_ATTR(max_luns, S_IRUGO | S_IWUSR, sdebug_max_luns_show,
3020             sdebug_max_luns_store);
3021
3022 static ssize_t sdebug_max_queue_show(struct device_driver * ddp, char * buf)
3023 {
3024         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_max_queue);
3025 }
3026 static ssize_t sdebug_max_queue_store(struct device_driver * ddp,
3027                                       const char * buf, size_t count)
3028 {
3029         int n;
3030
3031         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n > 0) &&
3032             (n <= SCSI_DEBUG_CANQUEUE)) {
3033                 scsi_debug_max_queue = n;
3034                 return count;
3035         }
3036         return -EINVAL;
3037 }
3038 DRIVER_ATTR(max_queue, S_IRUGO | S_IWUSR, sdebug_max_queue_show,
3039             sdebug_max_queue_store);
3040
3041 static ssize_t sdebug_no_uld_show(struct device_driver * ddp, char * buf)
3042 {
3043         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_no_uld);
3044 }
3045 DRIVER_ATTR(no_uld, S_IRUGO, sdebug_no_uld_show, NULL);
3046
3047 static ssize_t sdebug_scsi_level_show(struct device_driver * ddp, char * buf)
3048 {
3049         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_scsi_level);
3050 }
3051 DRIVER_ATTR(scsi_level, S_IRUGO, sdebug_scsi_level_show, NULL);
3052
3053 static ssize_t sdebug_virtual_gb_show(struct device_driver * ddp, char * buf)
3054 {
3055         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_virtual_gb);
3056 }
3057 static ssize_t sdebug_virtual_gb_store(struct device_driver * ddp,
3058                                        const char * buf, size_t count)
3059 {
3060         int n;
3061
3062         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3063                 scsi_debug_virtual_gb = n;
3064
3065                 sdebug_capacity = get_sdebug_capacity();
3066
3067                 return count;
3068         }
3069         return -EINVAL;
3070 }
3071 DRIVER_ATTR(virtual_gb, S_IRUGO | S_IWUSR, sdebug_virtual_gb_show,
3072             sdebug_virtual_gb_store);
3073
3074 static ssize_t sdebug_add_host_show(struct device_driver * ddp, char * buf)
3075 {
3076         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_add_host);
3077 }
3078
3079 static ssize_t sdebug_add_host_store(struct device_driver * ddp,
3080                                      const char * buf, size_t count)
3081 {
3082         int delta_hosts;
3083
3084         if (sscanf(buf, "%d", &delta_hosts) != 1)
3085                 return -EINVAL;
3086         if (delta_hosts > 0) {
3087                 do {
3088                         sdebug_add_adapter();
3089                 } while (--delta_hosts);
3090         } else if (delta_hosts < 0) {
3091                 do {
3092                         sdebug_remove_adapter();
3093                 } while (++delta_hosts);
3094         }
3095         return count;
3096 }
3097 DRIVER_ATTR(add_host, S_IRUGO | S_IWUSR, sdebug_add_host_show,
3098             sdebug_add_host_store);
3099
3100 static ssize_t sdebug_vpd_use_hostno_show(struct device_driver * ddp,
3101                                           char * buf)
3102 {
3103         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_vpd_use_hostno);
3104 }
3105 static ssize_t sdebug_vpd_use_hostno_store(struct device_driver * ddp,
3106                                            const char * buf, size_t count)
3107 {
3108         int n;
3109
3110         if ((count > 0) && (1 == sscanf(buf, "%d", &n)) && (n >= 0)) {
3111                 scsi_debug_vpd_use_hostno = n;
3112                 return count;
3113         }
3114         return -EINVAL;
3115 }
3116 DRIVER_ATTR(vpd_use_hostno, S_IRUGO | S_IWUSR, sdebug_vpd_use_hostno_show,
3117             sdebug_vpd_use_hostno_store);
3118
3119 static ssize_t sdebug_sector_size_show(struct device_driver * ddp, char * buf)
3120 {
3121         return scnprintf(buf, PAGE_SIZE, "%u\n", scsi_debug_sector_size);
3122 }
3123 DRIVER_ATTR(sector_size, S_IRUGO, sdebug_sector_size_show, NULL);
3124
3125 static ssize_t sdebug_dix_show(struct device_driver *ddp, char *buf)
3126 {
3127         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dix);
3128 }
3129 DRIVER_ATTR(dix, S_IRUGO, sdebug_dix_show, NULL);
3130
3131 static ssize_t sdebug_dif_show(struct device_driver *ddp, char *buf)
3132 {
3133         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_dif);
3134 }
3135 DRIVER_ATTR(dif, S_IRUGO, sdebug_dif_show, NULL);
3136
3137 static ssize_t sdebug_guard_show(struct device_driver *ddp, char *buf)
3138 {
3139         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_guard);
3140 }
3141 DRIVER_ATTR(guard, S_IRUGO, sdebug_guard_show, NULL);
3142
3143 static ssize_t sdebug_ato_show(struct device_driver *ddp, char *buf)
3144 {
3145         return scnprintf(buf, PAGE_SIZE, "%d\n", scsi_debug_ato);
3146 }
3147 DRIVER_ATTR(ato, S_IRUGO, sdebug_ato_show, NULL);
3148
3149 static ssize_t sdebug_map_show(struct device_driver *ddp, char *buf)
3150 {
3151         ssize_t count;
3152
3153         if (scsi_debug_tpu == 0 && scsi_debug_tpws == 0)
3154                 return scnprintf(buf, PAGE_SIZE, "0-%u\n",
3155                                  sdebug_store_sectors);
3156
3157         count = bitmap_scnlistprintf(buf, PAGE_SIZE, map_storep, map_size);
3158
3159         buf[count++] = '\n';
3160         buf[count++] = 0;
3161
3162         return count;
3163 }
3164 DRIVER_ATTR(map, S_IRUGO, sdebug_map_show, NULL);
3165
3166
3167 /* Note: The following function creates attribute files in the
3168    /sys/bus/pseudo/drivers/scsi_debug directory. The advantage of these
3169    files (over those found in the /sys/module/scsi_debug/parameters
3170    directory) is that auxiliary actions can be triggered when an attribute
3171    is changed. For example see: sdebug_add_host_store() above.
3172  */
3173 static int do_create_driverfs_files(void)
3174 {
3175         int ret;
3176
3177         ret = driver_create_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3178         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_delay);
3179         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3180         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3181         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3182         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3183         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3184         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3185         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3186         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3187         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3188         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3189         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3190         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_opts);
3191         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3192         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3193         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3194         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3195         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dix);
3196         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_dif);
3197         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_guard);
3198         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_ato);
3199         ret |= driver_create_file(&sdebug_driverfs_driver, &driver_attr_map);
3200         return ret;
3201 }
3202
3203 static void do_remove_driverfs_files(void)
3204 {
3205         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_map);
3206         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ato);
3207         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_guard);
3208         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dif);
3209         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dix);
3210         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_sector_size);
3211         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_vpd_use_hostno);
3212         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_virtual_gb);
3213         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_scsi_level);
3214         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_opts);
3215         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_ptype);
3216         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_tgts);
3217         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_num_parts);
3218         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_uld);
3219         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_no_lun_0);
3220         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_queue);
3221         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_max_luns);
3222         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_fake_rw);
3223         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_every_nth);
3224         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dsense);
3225         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_dev_size_mb);
3226         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_delay);
3227         driver_remove_file(&sdebug_driverfs_driver, &driver_attr_add_host);
3228 }
3229
3230 struct device *pseudo_primary;
3231
3232 static int __init scsi_debug_init(void)
3233 {
3234         unsigned long sz;
3235         int host_to_add;
3236         int k;
3237         int ret;
3238
3239         switch (scsi_debug_sector_size) {
3240         case  512:
3241         case 1024:
3242         case 2048:
3243         case 4096:
3244                 break;
3245         default:
3246                 printk(KERN_ERR "scsi_debug_init: invalid sector_size %d\n",
3247                        scsi_debug_sector_size);
3248                 return -EINVAL;
3249         }
3250
3251         switch (scsi_debug_dif) {
3252
3253         case SD_DIF_TYPE0_PROTECTION:
3254         case SD_DIF_TYPE1_PROTECTION:
3255         case SD_DIF_TYPE2_PROTECTION:
3256         case SD_DIF_TYPE3_PROTECTION:
3257                 break;
3258
3259         default:
3260                 printk(KERN_ERR "scsi_debug_init: dif must be 0, 1, 2 or 3\n");
3261                 return -EINVAL;
3262         }
3263
3264         if (scsi_debug_guard > 1) {
3265                 printk(KERN_ERR "scsi_debug_init: guard must be 0 or 1\n");
3266                 return -EINVAL;
3267         }
3268
3269         if (scsi_debug_ato > 1) {
3270                 printk(KERN_ERR "scsi_debug_init: ato must be 0 or 1\n");
3271                 return -EINVAL;
3272         }
3273
3274         if (scsi_debug_physblk_exp > 15) {
3275                 printk(KERN_ERR "scsi_debug_init: invalid physblk_exp %u\n",
3276                        scsi_debug_physblk_exp);
3277                 return -EINVAL;
3278         }
3279
3280         if (scsi_debug_lowest_aligned > 0x3fff) {
3281                 printk(KERN_ERR "scsi_debug_init: lowest_aligned too big: %u\n",
3282                        scsi_debug_lowest_aligned);
3283                 return -EINVAL;
3284         }
3285
3286         if (scsi_debug_dev_size_mb < 1)
3287                 scsi_debug_dev_size_mb = 1;  /* force minimum 1 MB ramdisk */
3288         sz = (unsigned long)scsi_debug_dev_size_mb * 1048576;
3289         sdebug_store_sectors = sz / scsi_debug_sector_size;
3290         sdebug_capacity = get_sdebug_capacity();
3291
3292         /* play around with geometry, don't waste too much on track 0 */
3293         sdebug_heads = 8;
3294         sdebug_sectors_per = 32;
3295         if (scsi_debug_dev_size_mb >= 16)
3296                 sdebug_heads = 32;
3297         else if (scsi_debug_dev_size_mb >= 256)
3298                 sdebug_heads = 64;
3299         sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3300                                (sdebug_sectors_per * sdebug_heads);
3301         if (sdebug_cylinders_per >= 1024) {
3302                 /* other LLDs do this; implies >= 1GB ram disk ... */
3303                 sdebug_heads = 255;
3304                 sdebug_sectors_per = 63;
3305                 sdebug_cylinders_per = (unsigned long)sdebug_capacity /
3306                                (sdebug_sectors_per * sdebug_heads);
3307         }
3308
3309         fake_storep = vmalloc(sz);
3310         if (NULL == fake_storep) {
3311                 printk(KERN_ERR "scsi_debug_init: out of memory, 1\n");
3312                 return -ENOMEM;
3313         }
3314         memset(fake_storep, 0, sz);
3315         if (scsi_debug_num_parts > 0)
3316                 sdebug_build_parts(fake_storep, sz);
3317
3318         if (scsi_debug_dif) {
3319                 int dif_size;
3320
3321                 dif_size = sdebug_store_sectors * sizeof(struct sd_dif_tuple);
3322                 dif_storep = vmalloc(dif_size);
3323
3324                 printk(KERN_ERR "scsi_debug_init: dif_storep %u bytes @ %p\n",
3325                        dif_size, dif_storep);
3326
3327                 if (dif_storep == NULL) {
3328                         printk(KERN_ERR "scsi_debug_init: out of mem. (DIX)\n");
3329                         ret = -ENOMEM;
3330                         goto free_vm;
3331                 }
3332
3333                 memset(dif_storep, 0xff, dif_size);
3334         }
3335
3336         /* Thin Provisioning */
3337         if (scsi_debug_tpu || scsi_debug_tpws) {
3338                 unsigned int map_bytes;
3339
3340                 scsi_debug_unmap_max_blocks =
3341                         clamp(scsi_debug_unmap_max_blocks, 0U, 0xffffffffU);
3342
3343                 scsi_debug_unmap_max_desc =
3344                         clamp(scsi_debug_unmap_max_desc, 0U, 256U);
3345
3346                 scsi_debug_unmap_granularity =
3347                         clamp(scsi_debug_unmap_granularity, 1U, 0xffffffffU);
3348
3349                 if (scsi_debug_unmap_alignment &&
3350                     scsi_debug_unmap_granularity < scsi_debug_unmap_alignment) {
3351                         printk(KERN_ERR
3352                                "%s: ERR: unmap_granularity < unmap_alignment\n",
3353                                __func__);
3354                         return -EINVAL;
3355                 }
3356
3357                 map_size = (sdebug_store_sectors / scsi_debug_unmap_granularity);
3358                 map_bytes = map_size >> 3;
3359                 map_storep = vmalloc(map_bytes);
3360
3361                 printk(KERN_INFO "scsi_debug_init: %lu provisioning blocks\n",
3362                        map_size);
3363
3364                 if (map_storep == NULL) {
3365                         printk(KERN_ERR "scsi_debug_init: out of mem. (MAP)\n");
3366                         ret = -ENOMEM;
3367                         goto free_vm;
3368                 }
3369
3370                 memset(map_storep, 0x0, map_bytes);
3371
3372                 /* Map first 1KB for partition table */
3373                 if (scsi_debug_num_parts)
3374                         map_region(0, 2);
3375         }
3376
3377         pseudo_primary = root_device_register("pseudo_0");
3378         if (IS_ERR(pseudo_primary)) {
3379                 printk(KERN_WARNING "scsi_debug: root_device_register() error\n");
3380                 ret = PTR_ERR(pseudo_primary);
3381                 goto free_vm;
3382         }
3383         ret = bus_register(&pseudo_lld_bus);
3384         if (ret < 0) {
3385                 printk(KERN_WARNING "scsi_debug: bus_register error: %d\n",
3386                         ret);
3387                 goto dev_unreg;
3388         }
3389         ret = driver_register(&sdebug_driverfs_driver);
3390         if (ret < 0) {
3391                 printk(KERN_WARNING "scsi_debug: driver_register error: %d\n",
3392                         ret);
3393                 goto bus_unreg;
3394         }
3395         ret = do_create_driverfs_files();
3396         if (ret < 0) {
3397                 printk(KERN_WARNING "scsi_debug: driver_create_file error: %d\n",
3398                         ret);
3399                 goto del_files;
3400         }
3401
3402         init_all_queued();
3403
3404         host_to_add = scsi_debug_add_host;
3405         scsi_debug_add_host = 0;
3406
3407         for (k = 0; k < host_to_add; k++) {
3408                 if (sdebug_add_adapter()) {
3409                         printk(KERN_ERR "scsi_debug_init: "
3410                                "sdebug_add_adapter failed k=%d\n", k);
3411                         break;
3412                 }
3413         }
3414
3415         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) {
3416                 printk(KERN_INFO "scsi_debug_init: built %d host(s)\n",
3417                        scsi_debug_add_host);
3418         }
3419         return 0;
3420
3421 del_files:
3422         do_remove_driverfs_files();
3423         driver_unregister(&sdebug_driverfs_driver);
3424 bus_unreg:
3425         bus_unregister(&pseudo_lld_bus);
3426 dev_unreg:
3427         root_device_unregister(pseudo_primary);
3428 free_vm:
3429         if (map_storep)
3430                 vfree(map_storep);
3431         if (dif_storep)
3432                 vfree(dif_storep);
3433         vfree(fake_storep);
3434
3435         return ret;
3436 }
3437
3438 static void __exit scsi_debug_exit(void)
3439 {
3440         int k = scsi_debug_add_host;
3441
3442         stop_all_queued();
3443         for (; k; k--)
3444                 sdebug_remove_adapter();
3445         do_remove_driverfs_files();
3446         driver_unregister(&sdebug_driverfs_driver);
3447         bus_unregister(&pseudo_lld_bus);
3448         root_device_unregister(pseudo_primary);
3449
3450         if (dif_storep)
3451                 vfree(dif_storep);
3452
3453         vfree(fake_storep);
3454 }
3455
3456 device_initcall(scsi_debug_init);
3457 module_exit(scsi_debug_exit);
3458
3459 static void sdebug_release_adapter(struct device * dev)
3460 {
3461         struct sdebug_host_info *sdbg_host;
3462
3463         sdbg_host = to_sdebug_host(dev);
3464         kfree(sdbg_host);
3465 }
3466
3467 static int sdebug_add_adapter(void)
3468 {
3469         int k, devs_per_host;
3470         int error = 0;
3471         struct sdebug_host_info *sdbg_host;
3472         struct sdebug_dev_info *sdbg_devinfo, *tmp;
3473
3474         sdbg_host = kzalloc(sizeof(*sdbg_host),GFP_KERNEL);
3475         if (NULL == sdbg_host) {
3476                 printk(KERN_ERR "%s: out of memory at line %d\n",
3477                        __func__, __LINE__);
3478                 return -ENOMEM;
3479         }
3480
3481         INIT_LIST_HEAD(&sdbg_host->dev_info_list);
3482
3483         devs_per_host = scsi_debug_num_tgts * scsi_debug_max_luns;
3484         for (k = 0; k < devs_per_host; k++) {
3485                 sdbg_devinfo = sdebug_device_create(sdbg_host, GFP_KERNEL);
3486                 if (!sdbg_devinfo) {
3487                         printk(KERN_ERR "%s: out of memory at line %d\n",
3488                                __func__, __LINE__);
3489                         error = -ENOMEM;
3490                         goto clean;
3491                 }
3492         }
3493
3494         spin_lock(&sdebug_host_list_lock);
3495         list_add_tail(&sdbg_host->host_list, &sdebug_host_list);
3496         spin_unlock(&sdebug_host_list_lock);
3497
3498         sdbg_host->dev.bus = &pseudo_lld_bus;
3499         sdbg_host->dev.parent = pseudo_primary;
3500         sdbg_host->dev.release = &sdebug_release_adapter;
3501         dev_set_name(&sdbg_host->dev, "adapter%d", scsi_debug_add_host);
3502
3503         error = device_register(&sdbg_host->dev);
3504
3505         if (error)
3506                 goto clean;
3507
3508         ++scsi_debug_add_host;
3509         return error;
3510
3511 clean:
3512         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
3513                                  dev_list) {
3514                 list_del(&sdbg_devinfo->dev_list);
3515                 kfree(sdbg_devinfo);
3516         }
3517
3518         kfree(sdbg_host);
3519         return error;
3520 }
3521
3522 static void sdebug_remove_adapter(void)
3523 {
3524         struct sdebug_host_info * sdbg_host = NULL;
3525
3526         spin_lock(&sdebug_host_list_lock);
3527         if (!list_empty(&sdebug_host_list)) {
3528                 sdbg_host = list_entry(sdebug_host_list.prev,
3529                                        struct sdebug_host_info, host_list);
3530                 list_del(&sdbg_host->host_list);
3531         }
3532         spin_unlock(&sdebug_host_list_lock);
3533
3534         if (!sdbg_host)
3535                 return;
3536
3537         device_unregister(&sdbg_host->dev);
3538         --scsi_debug_add_host;
3539 }
3540
3541 static
3542 int scsi_debug_queuecommand_lck(struct scsi_cmnd *SCpnt, done_funct_t done)
3543 {
3544         unsigned char *cmd = (unsigned char *) SCpnt->cmnd;
3545         int len, k;
3546         unsigned int num;
3547         unsigned long long lba;
3548         u32 ei_lba;
3549         int errsts = 0;
3550         int target = SCpnt->device->id;
3551         struct sdebug_dev_info *devip = NULL;
3552         int inj_recovered = 0;
3553         int inj_transport = 0;
3554         int inj_dif = 0;
3555         int inj_dix = 0;
3556         int delay_override = 0;
3557         int unmap = 0;
3558
3559         scsi_set_resid(SCpnt, 0);
3560         if ((SCSI_DEBUG_OPT_NOISE & scsi_debug_opts) && cmd) {
3561                 printk(KERN_INFO "scsi_debug: cmd ");
3562                 for (k = 0, len = SCpnt->cmd_len; k < len; ++k)
3563                         printk("%02x ", (int)cmd[k]);
3564                 printk("\n");
3565         }
3566
3567         if (target == SCpnt->device->host->hostt->this_id) {
3568                 printk(KERN_INFO "scsi_debug: initiator's id used as "
3569                        "target!\n");
3570                 return schedule_resp(SCpnt, NULL, done,
3571                                      DID_NO_CONNECT << 16, 0);
3572         }
3573
3574         if ((SCpnt->device->lun >= scsi_debug_max_luns) &&
3575             (SCpnt->device->lun != SAM2_WLUN_REPORT_LUNS))
3576                 return schedule_resp(SCpnt, NULL, done,
3577                                      DID_NO_CONNECT << 16, 0);
3578         devip = devInfoReg(SCpnt->device);
3579         if (NULL == devip)
3580                 return schedule_resp(SCpnt, NULL, done,
3581                                      DID_NO_CONNECT << 16, 0);
3582
3583         if ((scsi_debug_every_nth != 0) &&
3584             (++scsi_debug_cmnd_count >= abs(scsi_debug_every_nth))) {
3585                 scsi_debug_cmnd_count = 0;
3586                 if (scsi_debug_every_nth < -1)
3587                         scsi_debug_every_nth = -1;
3588                 if (SCSI_DEBUG_OPT_TIMEOUT & scsi_debug_opts)
3589                         return 0; /* ignore command causing timeout */
3590                 else if (SCSI_DEBUG_OPT_RECOVERED_ERR & scsi_debug_opts)
3591                         inj_recovered = 1; /* to reads and writes below */
3592                 else if (SCSI_DEBUG_OPT_TRANSPORT_ERR & scsi_debug_opts)
3593                         inj_transport = 1; /* to reads and writes below */
3594                 else if (SCSI_DEBUG_OPT_DIF_ERR & scsi_debug_opts)
3595                         inj_dif = 1; /* to reads and writes below */
3596                 else if (SCSI_DEBUG_OPT_DIX_ERR & scsi_debug_opts)
3597                         inj_dix = 1; /* to reads and writes below */
3598         }
3599
3600         if (devip->wlun) {
3601                 switch (*cmd) {
3602                 case INQUIRY:
3603                 case REQUEST_SENSE:
3604                 case TEST_UNIT_READY:
3605                 case REPORT_LUNS:
3606                         break;  /* only allowable wlun commands */
3607                 default:
3608                         if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3609                                 printk(KERN_INFO "scsi_debug: Opcode: 0x%x "
3610                                        "not supported for wlun\n", *cmd);
3611                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3612                                         INVALID_OPCODE, 0);
3613                         errsts = check_condition_result;
3614                         return schedule_resp(SCpnt, devip, done, errsts,
3615                                              0);
3616                 }
3617         }
3618
3619         switch (*cmd) {
3620         case INQUIRY:     /* mandatory, ignore unit attention */
3621                 delay_override = 1;
3622                 errsts = resp_inquiry(SCpnt, target, devip);
3623                 break;
3624         case REQUEST_SENSE:     /* mandatory, ignore unit attention */
3625                 delay_override = 1;
3626                 errsts = resp_requests(SCpnt, devip);
3627                 break;
3628         case REZERO_UNIT:       /* actually this is REWIND for SSC */
3629         case START_STOP:
3630                 errsts = resp_start_stop(SCpnt, devip);
3631                 break;
3632         case ALLOW_MEDIUM_REMOVAL:
3633                 errsts = check_readiness(SCpnt, 1, devip);
3634                 if (errsts)
3635                         break;
3636                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3637                         printk(KERN_INFO "scsi_debug: Medium removal %s\n",
3638                                cmd[4] ? "inhibited" : "enabled");
3639                 break;
3640         case SEND_DIAGNOSTIC:     /* mandatory */
3641                 errsts = check_readiness(SCpnt, 1, devip);
3642                 break;
3643         case TEST_UNIT_READY:     /* mandatory */
3644                 delay_override = 1;
3645                 errsts = check_readiness(SCpnt, 0, devip);
3646                 break;
3647         case RESERVE:
3648                 errsts = check_readiness(SCpnt, 1, devip);
3649                 break;
3650         case RESERVE_10:
3651                 errsts = check_readiness(SCpnt, 1, devip);
3652                 break;
3653         case RELEASE:
3654                 errsts = check_readiness(SCpnt, 1, devip);
3655                 break;
3656         case RELEASE_10:
3657                 errsts = check_readiness(SCpnt, 1, devip);
3658                 break;
3659         case READ_CAPACITY:
3660                 errsts = resp_readcap(SCpnt, devip);
3661                 break;
3662         case SERVICE_ACTION_IN:
3663                 if (cmd[1] == SAI_READ_CAPACITY_16)
3664                         errsts = resp_readcap16(SCpnt, devip);
3665                 else if (cmd[1] == SAI_GET_LBA_STATUS) {
3666
3667                         if (scsi_debug_tpu == 0 && scsi_debug_tpws == 0) {
3668                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3669                                                 INVALID_COMMAND_OPCODE, 0);
3670                                 errsts = check_condition_result;
3671                         } else
3672                                 errsts = resp_get_lba_status(SCpnt, devip);
3673                 } else {
3674                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3675                                         INVALID_OPCODE, 0);
3676                         errsts = check_condition_result;
3677                 }
3678                 break;
3679         case MAINTENANCE_IN:
3680                 if (MI_REPORT_TARGET_PGS != cmd[1]) {
3681                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3682                                         INVALID_OPCODE, 0);
3683                         errsts = check_condition_result;
3684                         break;
3685                 }
3686                 errsts = resp_report_tgtpgs(SCpnt, devip);
3687                 break;
3688         case READ_16:
3689         case READ_12:
3690         case READ_10:
3691                 /* READ{10,12,16} and DIF Type 2 are natural enemies */
3692                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3693                     cmd[1] & 0xe0) {
3694                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3695                                         INVALID_COMMAND_OPCODE, 0);
3696                         errsts = check_condition_result;
3697                         break;
3698                 }
3699
3700                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3701                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3702                     (cmd[1] & 0xe0) == 0)
3703                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3704
3705                 /* fall through */
3706         case READ_6:
3707 read:
3708                 errsts = check_readiness(SCpnt, 0, devip);
3709                 if (errsts)
3710                         break;
3711                 if (scsi_debug_fake_rw)
3712                         break;
3713                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3714                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3715                 if (inj_recovered && (0 == errsts)) {
3716                         mk_sense_buffer(devip, RECOVERED_ERROR,
3717                                         THRESHOLD_EXCEEDED, 0);
3718                         errsts = check_condition_result;
3719                 } else if (inj_transport && (0 == errsts)) {
3720                         mk_sense_buffer(devip, ABORTED_COMMAND,
3721                                         TRANSPORT_PROBLEM, ACK_NAK_TO);
3722                         errsts = check_condition_result;
3723                 } else if (inj_dif && (0 == errsts)) {
3724                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3725                         errsts = illegal_condition_result;
3726                 } else if (inj_dix && (0 == errsts)) {
3727                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3728                         errsts = illegal_condition_result;
3729                 }
3730                 break;
3731         case REPORT_LUNS:       /* mandatory, ignore unit attention */
3732                 delay_override = 1;
3733                 errsts = resp_report_luns(SCpnt, devip);
3734                 break;
3735         case VERIFY:            /* 10 byte SBC-2 command */
3736                 errsts = check_readiness(SCpnt, 0, devip);
3737                 break;
3738         case WRITE_16:
3739         case WRITE_12:
3740         case WRITE_10:
3741                 /* WRITE{10,12,16} and DIF Type 2 are natural enemies */
3742                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION &&
3743                     cmd[1] & 0xe0) {
3744                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3745                                         INVALID_COMMAND_OPCODE, 0);
3746                         errsts = check_condition_result;
3747                         break;
3748                 }
3749
3750                 if ((scsi_debug_dif == SD_DIF_TYPE1_PROTECTION ||
3751                      scsi_debug_dif == SD_DIF_TYPE3_PROTECTION) &&
3752                     (cmd[1] & 0xe0) == 0)
3753                         printk(KERN_ERR "Unprotected RD/WR to DIF device\n");
3754
3755                 /* fall through */
3756         case WRITE_6:
3757 write:
3758                 errsts = check_readiness(SCpnt, 0, devip);
3759                 if (errsts)
3760                         break;
3761                 if (scsi_debug_fake_rw)
3762                         break;
3763                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3764                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3765                 if (inj_recovered && (0 == errsts)) {
3766                         mk_sense_buffer(devip, RECOVERED_ERROR,
3767                                         THRESHOLD_EXCEEDED, 0);
3768                         errsts = check_condition_result;
3769                 } else if (inj_dif && (0 == errsts)) {
3770                         mk_sense_buffer(devip, ABORTED_COMMAND, 0x10, 1);
3771                         errsts = illegal_condition_result;
3772                 } else if (inj_dix && (0 == errsts)) {
3773                         mk_sense_buffer(devip, ILLEGAL_REQUEST, 0x10, 1);
3774                         errsts = illegal_condition_result;
3775                 }
3776                 break;
3777         case WRITE_SAME_16:
3778                 if (cmd[1] & 0x8) {
3779                         if (scsi_debug_tpws == 0) {
3780                                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3781                                                 INVALID_FIELD_IN_CDB, 0);
3782                                 errsts = check_condition_result;
3783                         } else
3784                                 unmap = 1;
3785                 }
3786                 if (errsts)
3787                         break;
3788                 /* fall through */
3789         case WRITE_SAME:
3790                 errsts = check_readiness(SCpnt, 0, devip);
3791                 if (errsts)
3792                         break;
3793                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3794                 errsts = resp_write_same(SCpnt, lba, num, devip, ei_lba, unmap);
3795                 break;
3796         case UNMAP:
3797                 errsts = check_readiness(SCpnt, 0, devip);
3798                 if (errsts)
3799                         break;
3800
3801                 if (scsi_debug_unmap_max_desc == 0 || scsi_debug_tpu == 0) {
3802                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3803                                         INVALID_COMMAND_OPCODE, 0);
3804                         errsts = check_condition_result;
3805                 } else
3806                         errsts = resp_unmap(SCpnt, devip);
3807                 break;
3808         case MODE_SENSE:
3809         case MODE_SENSE_10:
3810                 errsts = resp_mode_sense(SCpnt, target, devip);
3811                 break;
3812         case MODE_SELECT:
3813                 errsts = resp_mode_select(SCpnt, 1, devip);
3814                 break;
3815         case MODE_SELECT_10:
3816                 errsts = resp_mode_select(SCpnt, 0, devip);
3817                 break;
3818         case LOG_SENSE:
3819                 errsts = resp_log_sense(SCpnt, devip);
3820                 break;
3821         case SYNCHRONIZE_CACHE:
3822                 delay_override = 1;
3823                 errsts = check_readiness(SCpnt, 0, devip);
3824                 break;
3825         case WRITE_BUFFER:
3826                 errsts = check_readiness(SCpnt, 1, devip);
3827                 break;
3828         case XDWRITEREAD_10:
3829                 if (!scsi_bidi_cmnd(SCpnt)) {
3830                         mk_sense_buffer(devip, ILLEGAL_REQUEST,
3831                                         INVALID_FIELD_IN_CDB, 0);
3832                         errsts = check_condition_result;
3833                         break;
3834                 }
3835
3836                 errsts = check_readiness(SCpnt, 0, devip);
3837                 if (errsts)
3838                         break;
3839                 if (scsi_debug_fake_rw)
3840                         break;
3841                 get_data_transfer_info(cmd, &lba, &num, &ei_lba);
3842                 errsts = resp_read(SCpnt, lba, num, devip, ei_lba);
3843                 if (errsts)
3844                         break;
3845                 errsts = resp_write(SCpnt, lba, num, devip, ei_lba);
3846                 if (errsts)
3847                         break;
3848                 errsts = resp_xdwriteread(SCpnt, lba, num, devip);
3849                 break;
3850         case VARIABLE_LENGTH_CMD:
3851                 if (scsi_debug_dif == SD_DIF_TYPE2_PROTECTION) {
3852
3853                         if ((cmd[10] & 0xe0) == 0)
3854                                 printk(KERN_ERR
3855                                        "Unprotected RD/WR to DIF device\n");
3856
3857                         if (cmd[9] == READ_32) {
3858                                 BUG_ON(SCpnt->cmd_len < 32);
3859                                 goto read;
3860                         }
3861
3862                         if (cmd[9] == WRITE_32) {
3863                                 BUG_ON(SCpnt->cmd_len < 32);
3864                                 goto write;
3865                         }
3866                 }
3867
3868                 mk_sense_buffer(devip, ILLEGAL_REQUEST,
3869                                 INVALID_FIELD_IN_CDB, 0);
3870                 errsts = check_condition_result;
3871                 break;
3872
3873         default:
3874                 if (SCSI_DEBUG_OPT_NOISE & scsi_debug_opts)
3875                         printk(KERN_INFO "scsi_debug: Opcode: 0x%x not "
3876                                "supported\n", *cmd);
3877                 errsts = check_readiness(SCpnt, 1, devip);
3878                 if (errsts)
3879                         break;  /* Unit attention takes precedence */
3880                 mk_sense_buffer(devip, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
3881                 errsts = check_condition_result;
3882                 break;
3883         }
3884         return schedule_resp(SCpnt, devip, done, errsts,
3885                              (delay_override ? 0 : scsi_debug_delay));
3886 }
3887
3888 static DEF_SCSI_QCMD(scsi_debug_queuecommand)
3889
3890 static struct scsi_host_template sdebug_driver_template = {
3891         .proc_info =            scsi_debug_proc_info,
3892         .proc_name =            sdebug_proc_name,
3893         .name =                 "SCSI DEBUG",
3894         .info =                 scsi_debug_info,
3895         .slave_alloc =          scsi_debug_slave_alloc,
3896         .slave_configure =      scsi_debug_slave_configure,
3897         .slave_destroy =        scsi_debug_slave_destroy,
3898         .ioctl =                scsi_debug_ioctl,
3899         .queuecommand =         scsi_debug_queuecommand,
3900         .eh_abort_handler =     scsi_debug_abort,
3901         .eh_bus_reset_handler = scsi_debug_bus_reset,
3902         .eh_device_reset_handler = scsi_debug_device_reset,
3903         .eh_host_reset_handler = scsi_debug_host_reset,
3904         .bios_param =           scsi_debug_biosparam,
3905         .can_queue =            SCSI_DEBUG_CANQUEUE,
3906         .this_id =              7,
3907         .sg_tablesize =         256,
3908         .cmd_per_lun =          16,
3909         .max_sectors =          0xffff,
3910         .use_clustering =       DISABLE_CLUSTERING,
3911         .module =               THIS_MODULE,
3912 };
3913
3914 static int sdebug_driver_probe(struct device * dev)
3915 {
3916         int error = 0;
3917         struct sdebug_host_info *sdbg_host;
3918         struct Scsi_Host *hpnt;
3919         int host_prot;
3920
3921         sdbg_host = to_sdebug_host(dev);
3922
3923         sdebug_driver_template.can_queue = scsi_debug_max_queue;
3924         hpnt = scsi_host_alloc(&sdebug_driver_template, sizeof(sdbg_host));
3925         if (NULL == hpnt) {
3926                 printk(KERN_ERR "%s: scsi_register failed\n", __func__);
3927                 error = -ENODEV;
3928                 return error;
3929         }
3930
3931         sdbg_host->shost = hpnt;
3932         *((struct sdebug_host_info **)hpnt->hostdata) = sdbg_host;
3933         if ((hpnt->this_id >= 0) && (scsi_debug_num_tgts > hpnt->this_id))
3934                 hpnt->max_id = scsi_debug_num_tgts + 1;
3935         else
3936                 hpnt->max_id = scsi_debug_num_tgts;
3937         hpnt->max_lun = SAM2_WLUN_REPORT_LUNS;  /* = scsi_debug_max_luns; */
3938
3939         host_prot = 0;
3940
3941         switch (scsi_debug_dif) {
3942
3943         case SD_DIF_TYPE1_PROTECTION:
3944                 host_prot = SHOST_DIF_TYPE1_PROTECTION;
3945                 if (scsi_debug_dix)
3946                         host_prot |= SHOST_DIX_TYPE1_PROTECTION;
3947                 break;
3948
3949         case SD_DIF_TYPE2_PROTECTION:
3950                 host_prot = SHOST_DIF_TYPE2_PROTECTION;
3951                 if (scsi_debug_dix)
3952                         host_prot |= SHOST_DIX_TYPE2_PROTECTION;
3953                 break;
3954
3955         case SD_DIF_TYPE3_PROTECTION:
3956                 host_prot = SHOST_DIF_TYPE3_PROTECTION;
3957                 if (scsi_debug_dix)
3958                         host_prot |= SHOST_DIX_TYPE3_PROTECTION;
3959                 break;
3960
3961         default:
3962                 if (scsi_debug_dix)
3963                         host_prot |= SHOST_DIX_TYPE0_PROTECTION;
3964                 break;
3965         }
3966
3967         scsi_host_set_prot(hpnt, host_prot);
3968
3969         printk(KERN_INFO "scsi_debug: host protection%s%s%s%s%s%s%s\n",
3970                (host_prot & SHOST_DIF_TYPE1_PROTECTION) ? " DIF1" : "",
3971                (host_prot & SHOST_DIF_TYPE2_PROTECTION) ? " DIF2" : "",
3972                (host_prot & SHOST_DIF_TYPE3_PROTECTION) ? " DIF3" : "",
3973                (host_prot & SHOST_DIX_TYPE0_PROTECTION) ? " DIX0" : "",
3974                (host_prot & SHOST_DIX_TYPE1_PROTECTION) ? " DIX1" : "",
3975                (host_prot & SHOST_DIX_TYPE2_PROTECTION) ? " DIX2" : "",
3976                (host_prot & SHOST_DIX_TYPE3_PROTECTION) ? " DIX3" : "");
3977
3978         if (scsi_debug_guard == 1)
3979                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_IP);
3980         else
3981                 scsi_host_set_guard(hpnt, SHOST_DIX_GUARD_CRC);
3982
3983         error = scsi_add_host(hpnt, &sdbg_host->dev);
3984         if (error) {
3985                 printk(KERN_ERR "%s: scsi_add_host failed\n", __func__);
3986                 error = -ENODEV;
3987                 scsi_host_put(hpnt);
3988         } else
3989                 scsi_scan_host(hpnt);
3990
3991
3992         return error;
3993 }
3994
3995 static int sdebug_driver_remove(struct device * dev)
3996 {
3997         struct sdebug_host_info *sdbg_host;
3998         struct sdebug_dev_info *sdbg_devinfo, *tmp;
3999
4000         sdbg_host = to_sdebug_host(dev);
4001
4002         if (!sdbg_host) {
4003                 printk(KERN_ERR "%s: Unable to locate host info\n",
4004                        __func__);
4005                 return -ENODEV;
4006         }
4007
4008         scsi_remove_host(sdbg_host->shost);
4009
4010         list_for_each_entry_safe(sdbg_devinfo, tmp, &sdbg_host->dev_info_list,
4011                                  dev_list) {
4012                 list_del(&sdbg_devinfo->dev_list);
4013                 kfree(sdbg_devinfo);
4014         }
4015
4016         scsi_host_put(sdbg_host->shost);
4017         return 0;
4018 }
4019
4020 static int pseudo_lld_bus_match(struct device *dev,
4021                                 struct device_driver *dev_driver)
4022 {
4023         return 1;
4024 }
4025
4026 static struct bus_type pseudo_lld_bus = {
4027         .name = "pseudo",
4028         .match = pseudo_lld_bus_match,
4029         .probe = sdebug_driver_probe,
4030         .remove = sdebug_driver_remove,
4031 };