Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * scsi.c Copyright (C) 1992 Drew Eckhardt |
| 3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale |
| 4 | * Copyright (C) 2002, 2003 Christoph Hellwig |
| 5 | * |
| 6 | * generic mid-level SCSI driver |
| 7 | * Initial versions: Drew Eckhardt |
| 8 | * Subsequent revisions: Eric Youngdale |
| 9 | * |
| 10 | * <drew@colorado.edu> |
| 11 | * |
| 12 | * Bug correction thanks go to : |
| 13 | * Rik Faith <faith@cs.unc.edu> |
| 14 | * Tommy Thorn <tthorn> |
| 15 | * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de> |
| 16 | * |
| 17 | * Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to |
| 18 | * add scatter-gather, multiple outstanding request, and other |
| 19 | * enhancements. |
| 20 | * |
| 21 | * Native multichannel, wide scsi, /proc/scsi and hot plugging |
| 22 | * support added by Michael Neuffer <mike@i-connect.net> |
| 23 | * |
| 24 | * Added request_module("scsi_hostadapter") for kerneld: |
| 25 | * (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf) |
| 26 | * Bjorn Ekwall <bj0rn@blox.se> |
| 27 | * (changed to kmod) |
| 28 | * |
| 29 | * Major improvements to the timeout, abort, and reset processing, |
| 30 | * as well as performance modifications for large queue depths by |
| 31 | * Leonard N. Zubkoff <lnz@dandelion.com> |
| 32 | * |
| 33 | * Converted cli() code to spinlocks, Ingo Molnar |
| 34 | * |
| 35 | * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli |
| 36 | * |
| 37 | * out_of_space hacks, D. Gilbert (dpg) 990608 |
| 38 | */ |
| 39 | |
| 40 | #include <linux/module.h> |
| 41 | #include <linux/moduleparam.h> |
| 42 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/timer.h> |
| 44 | #include <linux/string.h> |
| 45 | #include <linux/slab.h> |
| 46 | #include <linux/blkdev.h> |
| 47 | #include <linux/delay.h> |
| 48 | #include <linux/init.h> |
| 49 | #include <linux/completion.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/unistd.h> |
| 51 | #include <linux/spinlock.h> |
| 52 | #include <linux/kmod.h> |
| 53 | #include <linux/interrupt.h> |
| 54 | #include <linux/notifier.h> |
| 55 | #include <linux/cpu.h> |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 56 | #include <linux/mutex.h> |
Dan Williams | 2955b47 | 2012-07-09 19:33:25 -0700 | [diff] [blame] | 57 | #include <linux/async.h> |
Martin K. Petersen | 3c6bdae | 2012-09-18 12:19:30 -0400 | [diff] [blame] | 58 | #include <asm/unaligned.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #include <scsi/scsi.h> |
| 61 | #include <scsi/scsi_cmnd.h> |
| 62 | #include <scsi/scsi_dbg.h> |
| 63 | #include <scsi/scsi_device.h> |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 64 | #include <scsi/scsi_driver.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | #include <scsi/scsi_eh.h> |
| 66 | #include <scsi/scsi_host.h> |
| 67 | #include <scsi/scsi_tcq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | #include "scsi_priv.h" |
| 70 | #include "scsi_logging.h" |
| 71 | |
Kei Tokunaga | bf81623 | 2010-04-01 20:41:40 +0900 | [diff] [blame] | 72 | #define CREATE_TRACE_POINTS |
| 73 | #include <trace/events/scsi.h> |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | /* |
| 76 | * Definitions and constants. |
| 77 | */ |
| 78 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | * Note - the initial logging level can be set here to log events at boot time. |
| 81 | * After the system is up, you may enable logging via the /proc interface. |
| 82 | */ |
| 83 | unsigned int scsi_logging_level; |
| 84 | #if defined(CONFIG_SCSI_LOGGING) |
| 85 | EXPORT_SYMBOL(scsi_logging_level); |
| 86 | #endif |
| 87 | |
James Bottomley | ea80dad | 2012-06-06 14:54:13 +0900 | [diff] [blame] | 88 | /* sd, scsi core and power management need to coordinate flushing async actions */ |
Dan Williams | 2955b47 | 2012-07-09 19:33:25 -0700 | [diff] [blame] | 89 | ASYNC_DOMAIN(scsi_sd_probe_domain); |
Dan Williams | a7a20d1 | 2012-03-22 17:05:11 -0700 | [diff] [blame] | 90 | EXPORT_SYMBOL(scsi_sd_probe_domain); |
Dan Williams | a7a20d1 | 2012-03-22 17:05:11 -0700 | [diff] [blame] | 91 | |
Dan Williams | 3c31b52 | 2014-04-10 15:30:35 -0700 | [diff] [blame] | 92 | /* |
| 93 | * Separate domain (from scsi_sd_probe_domain) to maximize the benefit of |
| 94 | * asynchronous system resume operations. It is marked 'exclusive' to avoid |
| 95 | * being included in the async_synchronize_full() that is invoked by |
| 96 | * dpm_resume() |
| 97 | */ |
| 98 | ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain); |
| 99 | EXPORT_SYMBOL(scsi_sd_pm_domain); |
| 100 | |
Matthew Wilcox | 8a1cdc9 | 2006-09-24 20:22:52 -0600 | [diff] [blame] | 101 | /* NB: These are exposed through /proc/scsi/scsi and form part of the ABI. |
| 102 | * You may not alter any existing entry (although adding new ones is |
| 103 | * encouraged once assigned by ANSI/INCITS T10 |
| 104 | */ |
Matthew Wilcox | 4ff3671 | 2006-07-04 12:15:20 -0600 | [diff] [blame] | 105 | static const char *const scsi_device_types[] = { |
Matthew Wilcox | 8a1cdc9 | 2006-09-24 20:22:52 -0600 | [diff] [blame] | 106 | "Direct-Access ", |
| 107 | "Sequential-Access", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | "Printer ", |
| 109 | "Processor ", |
| 110 | "WORM ", |
Matthew Wilcox | 8a1cdc9 | 2006-09-24 20:22:52 -0600 | [diff] [blame] | 111 | "CD-ROM ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | "Scanner ", |
Matthew Wilcox | 8a1cdc9 | 2006-09-24 20:22:52 -0600 | [diff] [blame] | 113 | "Optical Device ", |
| 114 | "Medium Changer ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | "Communications ", |
Matthew Wilcox | 4ff3671 | 2006-07-04 12:15:20 -0600 | [diff] [blame] | 116 | "ASC IT8 ", |
| 117 | "ASC IT8 ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | "RAID ", |
| 119 | "Enclosure ", |
Matthew Wilcox | 8a1cdc9 | 2006-09-24 20:22:52 -0600 | [diff] [blame] | 120 | "Direct-Access-RBC", |
Matthew Wilcox | 4ff3671 | 2006-07-04 12:15:20 -0600 | [diff] [blame] | 121 | "Optical card ", |
| 122 | "Bridge controller", |
| 123 | "Object storage ", |
| 124 | "Automation/Drive ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | }; |
Matthew Wilcox | 4ff3671 | 2006-07-04 12:15:20 -0600 | [diff] [blame] | 126 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 127 | /** |
| 128 | * scsi_device_type - Return 17 char string indicating device type. |
| 129 | * @type: type number to look up |
| 130 | */ |
| 131 | |
Matthew Wilcox | 4ff3671 | 2006-07-04 12:15:20 -0600 | [diff] [blame] | 132 | const char * scsi_device_type(unsigned type) |
| 133 | { |
| 134 | if (type == 0x1e) |
| 135 | return "Well-known LUN "; |
| 136 | if (type == 0x1f) |
| 137 | return "No Device "; |
Eric Sesterhenn | 80c6e3c | 2006-09-26 13:22:13 +0200 | [diff] [blame] | 138 | if (type >= ARRAY_SIZE(scsi_device_types)) |
Matthew Wilcox | 4ff3671 | 2006-07-04 12:15:20 -0600 | [diff] [blame] | 139 | return "Unknown "; |
| 140 | return scsi_device_types[type]; |
| 141 | } |
| 142 | |
| 143 | EXPORT_SYMBOL(scsi_device_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | struct scsi_host_cmd_pool { |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 146 | struct kmem_cache *cmd_slab; |
| 147 | struct kmem_cache *sense_slab; |
| 148 | unsigned int users; |
| 149 | char *cmd_name; |
| 150 | char *sense_name; |
| 151 | unsigned int slab_flags; |
| 152 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | }; |
| 154 | |
| 155 | static struct scsi_host_cmd_pool scsi_cmd_pool = { |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 156 | .cmd_name = "scsi_cmd_cache", |
| 157 | .sense_name = "scsi_sense_cache", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | .slab_flags = SLAB_HWCACHE_ALIGN, |
| 159 | }; |
| 160 | |
| 161 | static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 162 | .cmd_name = "scsi_cmd_cache(DMA)", |
| 163 | .sense_name = "scsi_sense_cache(DMA)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | .slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, |
| 165 | .gfp_mask = __GFP_DMA, |
| 166 | }; |
| 167 | |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 168 | static DEFINE_MUTEX(host_cmd_pool_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 170 | /** |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 171 | * scsi_host_free_command - internal function to release a command |
| 172 | * @shost: host to free the command for |
James Bottomley | e507e30 | 2008-03-13 11:16:33 -0500 | [diff] [blame] | 173 | * @cmd: command to release |
| 174 | * |
| 175 | * the command must previously have been allocated by |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 176 | * scsi_host_alloc_command. |
James Bottomley | e507e30 | 2008-03-13 11:16:33 -0500 | [diff] [blame] | 177 | */ |
| 178 | static void |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 179 | scsi_host_free_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
James Bottomley | e507e30 | 2008-03-13 11:16:33 -0500 | [diff] [blame] | 180 | { |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 181 | struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
| 182 | |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 183 | if (cmd->prot_sdb) |
| 184 | kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb); |
James Bottomley | e507e30 | 2008-03-13 11:16:33 -0500 | [diff] [blame] | 185 | kmem_cache_free(pool->sense_slab, cmd->sense_buffer); |
| 186 | kmem_cache_free(pool->cmd_slab, cmd); |
| 187 | } |
| 188 | |
| 189 | /** |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 190 | * scsi_host_alloc_command - internal function to allocate command |
| 191 | * @shost: SCSI host whose pool to allocate from |
| 192 | * @gfp_mask: mask for the allocation |
| 193 | * |
| 194 | * Returns a fully allocated command with sense buffer and protection |
| 195 | * data buffer (where applicable) or NULL on failure |
| 196 | */ |
| 197 | static struct scsi_cmnd * |
| 198 | scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask) |
| 199 | { |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 200 | struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 201 | struct scsi_cmnd *cmd; |
| 202 | |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 203 | cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask | pool->gfp_mask); |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 204 | if (!cmd) |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 205 | goto fail; |
| 206 | |
| 207 | cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab, |
| 208 | gfp_mask | pool->gfp_mask); |
| 209 | if (!cmd->sense_buffer) |
| 210 | goto fail_free_cmd; |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 211 | |
| 212 | if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) { |
| 213 | cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask); |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 214 | if (!cmd->prot_sdb) |
| 215 | goto fail_free_sense; |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 216 | } |
| 217 | |
| 218 | return cmd; |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 219 | |
| 220 | fail_free_sense: |
| 221 | kmem_cache_free(pool->sense_slab, cmd->sense_buffer); |
| 222 | fail_free_cmd: |
| 223 | kmem_cache_free(pool->cmd_slab, cmd); |
| 224 | fail: |
| 225 | return NULL; |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 226 | } |
| 227 | |
| 228 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 229 | * __scsi_get_command - Allocate a struct scsi_cmnd |
| 230 | * @shost: host to transmit command |
| 231 | * @gfp_mask: allocation mask |
| 232 | * |
| 233 | * Description: allocate a struct scsi_cmd from host's slab, recycling from the |
| 234 | * host's free_list if necessary. |
| 235 | */ |
Christoph Hellwig | f1bea55 | 2014-04-15 12:26:54 +0200 | [diff] [blame] | 236 | static struct scsi_cmnd * |
| 237 | __scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | { |
Martin K. Petersen | b4c2554 | 2009-09-18 17:33:01 -0400 | [diff] [blame] | 239 | struct scsi_cmnd *cmd = scsi_host_alloc_command(shost, gfp_mask); |
Hugh Dickins | 164fc5d | 2008-04-06 23:56:57 +0100 | [diff] [blame] | 240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (unlikely(!cmd)) { |
| 242 | unsigned long flags; |
| 243 | |
| 244 | spin_lock_irqsave(&shost->free_list_lock, flags); |
| 245 | if (likely(!list_empty(&shost->free_list))) { |
| 246 | cmd = list_entry(shost->free_list.next, |
| 247 | struct scsi_cmnd, list); |
| 248 | list_del_init(&cmd->list); |
| 249 | } |
| 250 | spin_unlock_irqrestore(&shost->free_list_lock, flags); |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 251 | |
| 252 | if (cmd) { |
Martin K. Petersen | b4c2554 | 2009-09-18 17:33:01 -0400 | [diff] [blame] | 253 | void *buf, *prot; |
| 254 | |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 255 | buf = cmd->sense_buffer; |
Martin K. Petersen | b4c2554 | 2009-09-18 17:33:01 -0400 | [diff] [blame] | 256 | prot = cmd->prot_sdb; |
| 257 | |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 258 | memset(cmd, 0, sizeof(*cmd)); |
Martin K. Petersen | b4c2554 | 2009-09-18 17:33:01 -0400 | [diff] [blame] | 259 | |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 260 | cmd->sense_buffer = buf; |
Martin K. Petersen | b4c2554 | 2009-09-18 17:33:01 -0400 | [diff] [blame] | 261 | cmd->prot_sdb = prot; |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | return cmd; |
| 266 | } |
| 267 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 268 | /** |
| 269 | * scsi_get_command - Allocate and setup a scsi command block |
| 270 | * @dev: parent scsi device |
| 271 | * @gfp_mask: allocator flags |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | * |
| 273 | * Returns: The allocated scsi command structure. |
| 274 | */ |
Al Viro | c53033f | 2005-10-21 03:22:08 -0400 | [diff] [blame] | 275 | struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
Christoph Hellwig | 0479633 | 2014-02-20 14:20:55 -0800 | [diff] [blame] | 277 | struct scsi_cmnd *cmd = __scsi_get_command(dev->host, gfp_mask); |
| 278 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | |
Christoph Hellwig | 0479633 | 2014-02-20 14:20:55 -0800 | [diff] [blame] | 280 | if (unlikely(cmd == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return NULL; |
| 282 | |
Christoph Hellwig | 0479633 | 2014-02-20 14:20:55 -0800 | [diff] [blame] | 283 | cmd->device = dev; |
| 284 | INIT_LIST_HEAD(&cmd->list); |
| 285 | INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); |
| 286 | spin_lock_irqsave(&dev->list_lock, flags); |
| 287 | list_add_tail(&cmd->list, &dev->cmd_list); |
| 288 | spin_unlock_irqrestore(&dev->list_lock, flags); |
| 289 | cmd->jiffies_at_alloc = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | return cmd; |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 291 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 293 | /** |
| 294 | * __scsi_put_command - Free a struct scsi_cmnd |
| 295 | * @shost: dev->host |
| 296 | * @cmd: Command to free |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 297 | */ |
Christoph Hellwig | f1bea55 | 2014-04-15 12:26:54 +0200 | [diff] [blame] | 298 | static void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 299 | { |
| 300 | unsigned long flags; |
| 301 | |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 302 | if (unlikely(list_empty(&shost->free_list))) { |
Christoph Hellwig | 44b93b5 | 2014-02-20 14:20:53 -0800 | [diff] [blame] | 303 | spin_lock_irqsave(&shost->free_list_lock, flags); |
| 304 | if (list_empty(&shost->free_list)) { |
| 305 | list_add(&cmd->list, &shost->free_list); |
| 306 | cmd = NULL; |
| 307 | } |
| 308 | spin_unlock_irqrestore(&shost->free_list_lock, flags); |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 309 | } |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 310 | |
James Bottomley | e507e30 | 2008-03-13 11:16:33 -0500 | [diff] [blame] | 311 | if (likely(cmd != NULL)) |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 312 | scsi_host_free_command(shost, cmd); |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 313 | } |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 314 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 315 | /** |
| 316 | * scsi_put_command - Free a scsi command block |
| 317 | * @cmd: command block to free |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | * |
| 319 | * Returns: Nothing. |
| 320 | * |
| 321 | * Notes: The command must not belong to any lists. |
| 322 | */ |
| 323 | void scsi_put_command(struct scsi_cmnd *cmd) |
| 324 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | unsigned long flags; |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 326 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | /* serious error if the command hasn't come from a device list */ |
| 328 | spin_lock_irqsave(&cmd->device->list_lock, flags); |
| 329 | BUG_ON(list_empty(&cmd->list)); |
| 330 | list_del_init(&cmd->list); |
FUJITA Tomonori | b58d915 | 2006-11-16 19:24:10 +0900 | [diff] [blame] | 331 | spin_unlock_irqrestore(&cmd->device->list_lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Bart Van Assche | fcc95a7 | 2014-06-02 11:50:52 +0200 | [diff] [blame] | 333 | BUG_ON(delayed_work_pending(&cmd->abort_work)); |
Hannes Reinecke | e494f6a | 2013-11-11 13:44:54 +0100 | [diff] [blame] | 334 | |
Christoph Hellwig | 0479633 | 2014-02-20 14:20:55 -0800 | [diff] [blame] | 335 | __scsi_put_command(cmd->device->host, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 338 | static struct scsi_host_cmd_pool * |
| 339 | scsi_find_host_cmd_pool(struct Scsi_Host *shost) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | { |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 341 | if (shost->hostt->cmd_size) |
| 342 | return shost->hostt->cmd_pool; |
| 343 | if (shost->unchecked_isa_dma) |
| 344 | return &scsi_cmd_dma_pool; |
| 345 | return &scsi_cmd_pool; |
| 346 | } |
| 347 | |
| 348 | static void |
| 349 | scsi_free_host_cmd_pool(struct scsi_host_cmd_pool *pool) |
| 350 | { |
| 351 | kfree(pool->sense_name); |
| 352 | kfree(pool->cmd_name); |
| 353 | kfree(pool); |
| 354 | } |
| 355 | |
| 356 | static struct scsi_host_cmd_pool * |
| 357 | scsi_alloc_host_cmd_pool(struct Scsi_Host *shost) |
| 358 | { |
| 359 | struct scsi_host_template *hostt = shost->hostt; |
| 360 | struct scsi_host_cmd_pool *pool; |
| 361 | |
| 362 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); |
| 363 | if (!pool) |
| 364 | return NULL; |
| 365 | |
| 366 | pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->name); |
| 367 | pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->name); |
| 368 | if (!pool->cmd_name || !pool->sense_name) { |
| 369 | scsi_free_host_cmd_pool(pool); |
| 370 | return NULL; |
| 371 | } |
| 372 | |
| 373 | pool->slab_flags = SLAB_HWCACHE_ALIGN; |
| 374 | if (shost->unchecked_isa_dma) { |
| 375 | pool->slab_flags |= SLAB_CACHE_DMA; |
| 376 | pool->gfp_mask = __GFP_DMA; |
| 377 | } |
| 378 | return pool; |
| 379 | } |
| 380 | |
| 381 | static struct scsi_host_cmd_pool * |
| 382 | scsi_get_host_cmd_pool(struct Scsi_Host *shost) |
| 383 | { |
| 384 | struct scsi_host_template *hostt = shost->hostt; |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 385 | struct scsi_host_cmd_pool *retval = NULL, *pool; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 386 | size_t cmd_size = sizeof(struct scsi_cmnd) + hostt->cmd_size; |
| 387 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | /* |
| 389 | * Select a command slab for this host and create it if not |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 390 | * yet existent. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | */ |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 392 | mutex_lock(&host_cmd_pool_mutex); |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 393 | pool = scsi_find_host_cmd_pool(shost); |
| 394 | if (!pool) { |
| 395 | pool = scsi_alloc_host_cmd_pool(shost); |
| 396 | if (!pool) |
| 397 | goto out; |
| 398 | } |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | if (!pool->users) { |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 401 | pool->cmd_slab = kmem_cache_create(pool->cmd_name, cmd_size, 0, |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 402 | pool->slab_flags, NULL); |
| 403 | if (!pool->cmd_slab) |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 404 | goto out_free_pool; |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 405 | |
| 406 | pool->sense_slab = kmem_cache_create(pool->sense_name, |
| 407 | SCSI_SENSE_BUFFERSIZE, 0, |
| 408 | pool->slab_flags, NULL); |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 409 | if (!pool->sense_slab) |
| 410 | goto out_free_slab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | pool->users++; |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 414 | retval = pool; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 415 | out: |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 416 | mutex_unlock(&host_cmd_pool_mutex); |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 417 | return retval; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 418 | |
| 419 | out_free_slab: |
| 420 | kmem_cache_destroy(pool->cmd_slab); |
| 421 | out_free_pool: |
| 422 | if (hostt->cmd_size) |
| 423 | scsi_free_host_cmd_pool(pool); |
| 424 | goto out; |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 425 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 427 | static void scsi_put_host_cmd_pool(struct Scsi_Host *shost) |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 428 | { |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 429 | struct scsi_host_template *hostt = shost->hostt; |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 430 | struct scsi_host_cmd_pool *pool; |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 431 | |
FUJITA Tomonori | 166a728 | 2008-01-08 07:59:05 +0900 | [diff] [blame] | 432 | mutex_lock(&host_cmd_pool_mutex); |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 433 | pool = scsi_find_host_cmd_pool(shost); |
| 434 | |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 435 | /* |
| 436 | * This may happen if a driver has a mismatched get and put |
| 437 | * of the command pool; the driver should be implicated in |
| 438 | * the stack trace |
| 439 | */ |
| 440 | BUG_ON(pool->users == 0); |
| 441 | |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 442 | if (!--pool->users) { |
| 443 | kmem_cache_destroy(pool->cmd_slab); |
| 444 | kmem_cache_destroy(pool->sense_slab); |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 445 | if (hostt->cmd_size) |
| 446 | scsi_free_host_cmd_pool(pool); |
James Bottomley | 5b7f168 | 2008-01-20 09:28:24 -0600 | [diff] [blame] | 447 | } |
Arjan van de Ven | 0b95067 | 2006-01-11 13:16:10 +0100 | [diff] [blame] | 448 | mutex_unlock(&host_cmd_pool_mutex); |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 449 | } |
| 450 | |
| 451 | /** |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 452 | * scsi_setup_command_freelist - Setup the command freelist for a scsi host. |
| 453 | * @shost: host to allocate the freelist for. |
| 454 | * |
| 455 | * Description: The command freelist protects against system-wide out of memory |
| 456 | * deadlock by preallocating one SCSI command structure for each host, so the |
| 457 | * system can always write to a swap file on a device associated with that host. |
| 458 | * |
| 459 | * Returns: Nothing. |
| 460 | */ |
| 461 | int scsi_setup_command_freelist(struct Scsi_Host *shost) |
| 462 | { |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 463 | const gfp_t gfp_mask = shost->unchecked_isa_dma ? GFP_DMA : GFP_KERNEL; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 464 | struct scsi_cmnd *cmd; |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 465 | |
| 466 | spin_lock_init(&shost->free_list_lock); |
| 467 | INIT_LIST_HEAD(&shost->free_list); |
| 468 | |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 469 | shost->cmd_pool = scsi_get_host_cmd_pool(shost); |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 470 | if (!shost->cmd_pool) |
| 471 | return -ENOMEM; |
| 472 | |
| 473 | /* |
| 474 | * Get one backup command for this host. |
| 475 | */ |
Martin K. Petersen | 7027ad7 | 2008-07-17 17:08:48 -0400 | [diff] [blame] | 476 | cmd = scsi_host_alloc_command(shost, gfp_mask); |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 477 | if (!cmd) { |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 478 | scsi_put_host_cmd_pool(shost); |
Alan D. Brunelle | 61d7416 | 2008-04-29 16:12:51 -0400 | [diff] [blame] | 479 | shost->cmd_pool = NULL; |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 480 | return -ENOMEM; |
| 481 | } |
| 482 | list_add(&cmd->list, &shost->free_list); |
| 483 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 486 | /** |
| 487 | * scsi_destroy_command_freelist - Release the command freelist for a scsi host. |
| 488 | * @shost: host whose freelist is going to be destroyed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | */ |
| 490 | void scsi_destroy_command_freelist(struct Scsi_Host *shost) |
| 491 | { |
Alan D. Brunelle | 61d7416 | 2008-04-29 16:12:51 -0400 | [diff] [blame] | 492 | /* |
| 493 | * If cmd_pool is NULL the free list was not initialized, so |
| 494 | * do not attempt to release resources. |
| 495 | */ |
| 496 | if (!shost->cmd_pool) |
| 497 | return; |
| 498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | while (!list_empty(&shost->free_list)) { |
| 500 | struct scsi_cmnd *cmd; |
| 501 | |
| 502 | cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); |
| 503 | list_del_init(&cmd->list); |
Christoph Hellwig | 7c28334 | 2014-02-20 14:21:00 -0800 | [diff] [blame] | 504 | scsi_host_free_command(shost, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
James Bottomley | 1c353f7 | 2008-03-13 11:19:36 -0500 | [diff] [blame] | 506 | shost->cmd_pool = NULL; |
Christoph Hellwig | 89d9a56 | 2014-02-20 14:21:01 -0800 | [diff] [blame] | 507 | scsi_put_host_cmd_pool(shost); |
FUJITA Tomonori | de25deb | 2008-01-16 13:32:17 +0900 | [diff] [blame] | 508 | } |
| 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | #ifdef CONFIG_SCSI_LOGGING |
| 511 | void scsi_log_send(struct scsi_cmnd *cmd) |
| 512 | { |
| 513 | unsigned int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | |
| 515 | /* |
| 516 | * If ML QUEUE log level is greater than or equal to: |
| 517 | * |
| 518 | * 1: nothing (match completion) |
| 519 | * |
| 520 | * 2: log opcode + command of all commands |
| 521 | * |
| 522 | * 3: same as 2 plus dump cmd address |
| 523 | * |
| 524 | * 4: same as 3 plus dump extra junk |
| 525 | */ |
| 526 | if (unlikely(scsi_logging_level)) { |
| 527 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, |
| 528 | SCSI_LOG_MLQUEUE_BITS); |
| 529 | if (level > 1) { |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 530 | scmd_printk(KERN_INFO, cmd, "Send: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | if (level > 2) |
| 532 | printk("0x%p ", cmd); |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 533 | printk("\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | scsi_print_command(cmd); |
| 535 | if (level > 3) { |
| 536 | printk(KERN_INFO "buffer = 0x%p, bufflen = %d," |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 537 | " queuecommand 0x%p\n", |
Boaz Harrosh | a73e45b | 2007-07-04 21:26:01 +0300 | [diff] [blame] | 538 | scsi_sglist(cmd), scsi_bufflen(cmd), |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 539 | cmd->device->host->hostt->queuecommand); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | |
| 541 | } |
| 542 | } |
| 543 | } |
| 544 | } |
| 545 | |
| 546 | void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) |
| 547 | { |
| 548 | unsigned int level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | /* |
| 551 | * If ML COMPLETE log level is greater than or equal to: |
| 552 | * |
| 553 | * 1: log disposition, result, opcode + command, and conditionally |
| 554 | * sense data for failures or non SUCCESS dispositions. |
| 555 | * |
| 556 | * 2: same as 1 but for all command completions. |
| 557 | * |
| 558 | * 3: same as 2 plus dump cmd address |
| 559 | * |
| 560 | * 4: same as 3 plus dump extra junk |
| 561 | */ |
| 562 | if (unlikely(scsi_logging_level)) { |
| 563 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, |
| 564 | SCSI_LOG_MLCOMPLETE_BITS); |
| 565 | if (((level > 0) && (cmd->result || disposition != SUCCESS)) || |
| 566 | (level > 1)) { |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 567 | scmd_printk(KERN_INFO, cmd, "Done: "); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | if (level > 2) |
| 569 | printk("0x%p ", cmd); |
| 570 | /* |
| 571 | * Dump truncated values, so we usually fit within |
| 572 | * 80 chars. |
| 573 | */ |
| 574 | switch (disposition) { |
| 575 | case SUCCESS: |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 576 | printk("SUCCESS\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | break; |
| 578 | case NEEDS_RETRY: |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 579 | printk("RETRY\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | break; |
| 581 | case ADD_TO_MLQUEUE: |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 582 | printk("MLQUEUE\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | break; |
| 584 | case FAILED: |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 585 | printk("FAILED\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | break; |
| 587 | case TIMEOUT_ERROR: |
| 588 | /* |
| 589 | * If called via scsi_times_out. |
| 590 | */ |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 591 | printk("TIMEOUT\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | break; |
| 593 | default: |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 594 | printk("UNKNOWN\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 596 | scsi_print_result(cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | scsi_print_command(cmd); |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 598 | if (status_byte(cmd->result) & CHECK_CONDITION) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | scsi_print_sense("", cmd); |
Martin K. Petersen | a4d04a4 | 2007-02-27 22:40:27 -0500 | [diff] [blame] | 600 | if (level > 3) |
| 601 | scmd_printk(KERN_INFO, cmd, |
| 602 | "scsi host busy %d failed %d\n", |
| 603 | cmd->device->host->host_busy, |
| 604 | cmd->device->host->host_failed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | } |
| 606 | } |
| 607 | } |
| 608 | #endif |
| 609 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 610 | /** |
| 611 | * scsi_cmd_get_serial - Assign a serial number to a command |
| 612 | * @host: the scsi host |
| 613 | * @cmd: command to assign serial number to |
| 614 | * |
| 615 | * Description: a serial number identifies a request for error recovery |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | * and debugging purposes. Protected by the Host_Lock of host. |
| 617 | */ |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 618 | void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
| 620 | cmd->serial_number = host->cmd_serial_number++; |
| 621 | if (cmd->serial_number == 0) |
| 622 | cmd->serial_number = host->cmd_serial_number++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 624 | EXPORT_SYMBOL(scsi_cmd_get_serial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 626 | /** |
| 627 | * scsi_dispatch_command - Dispatch a command to the low-level driver. |
| 628 | * @cmd: command block we are dispatching. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 630 | * Return: nonzero return request was rejected and device's queue needs to be |
| 631 | * plugged. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | */ |
| 633 | int scsi_dispatch_cmd(struct scsi_cmnd *cmd) |
| 634 | { |
| 635 | struct Scsi_Host *host = cmd->device->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | int rtn = 0; |
| 637 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 638 | atomic_inc(&cmd->device->iorequest_cnt); |
| 639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | /* check if the device is still usable */ |
| 641 | if (unlikely(cmd->device->sdev_state == SDEV_DEL)) { |
| 642 | /* in SDEV_DEL we error all commands. DID_NO_CONNECT |
| 643 | * returns an immediate error upwards, and signals |
| 644 | * that the device is no longer present */ |
| 645 | cmd->result = DID_NO_CONNECT << 16; |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 646 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | |
James Bottomley | 0f1d87a | 2008-08-22 16:43:59 -0500 | [diff] [blame] | 649 | /* Check to see if the scsi lld made this device blocked. */ |
| 650 | if (unlikely(scsi_device_blocked(cmd->device))) { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 651 | /* |
James Bottomley | 0f1d87a | 2008-08-22 16:43:59 -0500 | [diff] [blame] | 652 | * in blocked state, the command is just put back on |
| 653 | * the device queue. The suspend state has already |
| 654 | * blocked the queue so future requests should not |
| 655 | * occur until the device transitions out of the |
| 656 | * suspend state. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | */ |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 658 | SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd, |
| 659 | "queuecommand : device blocked\n")); |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 660 | return SCSI_MLQUEUE_DEVICE_BUSY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 663 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | * If SCSI-2 or lower, store the LUN value in cmnd. |
| 665 | */ |
James Bottomley | 4d7db04 | 2006-03-31 20:07:45 -0600 | [diff] [blame] | 666 | if (cmd->device->scsi_level <= SCSI_2 && |
| 667 | cmd->device->scsi_level != SCSI_UNKNOWN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) | |
| 669 | (cmd->device->lun << 5 & 0xe0); |
| 670 | } |
| 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | scsi_log_send(cmd); |
| 673 | |
| 674 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | * Before we queue this command, check if the command |
| 676 | * length exceeds what the host adapter can handle. |
| 677 | */ |
Boaz Harrosh | db4742d | 2008-04-30 11:27:26 +0300 | [diff] [blame] | 678 | if (cmd->cmd_len > cmd->device->host->max_cmd_len) { |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 679 | SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd, |
| 680 | "queuecommand : command too long. " |
Boaz Harrosh | db4742d | 2008-04-30 11:27:26 +0300 | [diff] [blame] | 681 | "cdb_size=%d host->max_cmd_len=%d\n", |
| 682 | cmd->cmd_len, cmd->device->host->max_cmd_len)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | cmd->result = (DID_ABORT << 16); |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 684 | goto done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Mike Anderson | d2c9d9e | 2005-06-16 11:13:42 -0700 | [diff] [blame] | 687 | if (unlikely(host->shost_state == SHOST_DEL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | cmd->result = (DID_NO_CONNECT << 16); |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 689 | goto done; |
| 690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
Jeff Garzik | f281233 | 2010-11-16 02:10:29 -0500 | [diff] [blame] | 692 | |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 693 | trace_scsi_dispatch_cmd_start(cmd); |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 694 | rtn = host->hostt->queuecommand(host, cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | if (rtn) { |
Kei Tokunaga | bf81623 | 2010-04-01 20:41:40 +0900 | [diff] [blame] | 696 | trace_scsi_dispatch_cmd_error(cmd, rtn); |
Mike Christie | f0c0a37 | 2008-08-17 15:24:38 -0500 | [diff] [blame] | 697 | if (rtn != SCSI_MLQUEUE_DEVICE_BUSY && |
| 698 | rtn != SCSI_MLQUEUE_TARGET_BUSY) |
| 699 | rtn = SCSI_MLQUEUE_HOST_BUSY; |
| 700 | |
Hannes Reinecke | 91921e0 | 2014-06-25 16:39:59 +0200 | [diff] [blame] | 701 | SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd, |
| 702 | "queuecommand : request rejected\n")); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | return rtn; |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 706 | done: |
Christoph Hellwig | 3b5382c | 2014-05-06 12:25:40 +0200 | [diff] [blame^] | 707 | cmd->scsi_done(cmd); |
Christoph Hellwig | d0d3bbf | 2014-01-22 18:39:04 +0100 | [diff] [blame] | 708 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
| 710 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 712 | * scsi_finish_command - cleanup and pass command back to upper layer |
| 713 | * @cmd: the command |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 715 | * Description: Pass command off to upper layer for finishing of I/O |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | * request, waking processes that are waiting on results, |
| 717 | * etc. |
| 718 | */ |
| 719 | void scsi_finish_command(struct scsi_cmnd *cmd) |
| 720 | { |
| 721 | struct scsi_device *sdev = cmd->device; |
Mike Christie | f0c0a37 | 2008-08-17 15:24:38 -0500 | [diff] [blame] | 722 | struct scsi_target *starget = scsi_target(sdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | struct Scsi_Host *shost = sdev->host; |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 724 | struct scsi_driver *drv; |
| 725 | unsigned int good_bytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | scsi_device_unbusy(sdev); |
| 728 | |
| 729 | /* |
| 730 | * Clear the flags which say that the device/host is no longer |
| 731 | * capable of accepting new commands. These are set in scsi_queue.c |
| 732 | * for both the queue full condition on a device, and for a |
| 733 | * host full condition on the host. |
| 734 | * |
| 735 | * XXX(hch): What about locking? |
| 736 | */ |
| 737 | shost->host_blocked = 0; |
Mike Christie | f0c0a37 | 2008-08-17 15:24:38 -0500 | [diff] [blame] | 738 | starget->target_blocked = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | sdev->device_blocked = 0; |
| 740 | |
| 741 | /* |
| 742 | * If we have valid sense information, then some kind of recovery |
| 743 | * must have taken place. Make a note of this. |
| 744 | */ |
| 745 | if (SCSI_SENSE_VALID(cmd)) |
| 746 | cmd->result |= (DRIVER_SENSE << 24); |
| 747 | |
Jeff Garzik | 3bf743e | 2005-10-24 18:04:06 -0400 | [diff] [blame] | 748 | SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, |
| 749 | "Notifying upper driver of completion " |
| 750 | "(result %x)\n", cmd->result)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
FUJITA Tomonori | f18573a | 2008-04-11 12:56:52 +0200 | [diff] [blame] | 752 | good_bytes = scsi_bufflen(cmd); |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 753 | if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
James Bottomley | 427e59f | 2008-03-08 18:24:17 -0600 | [diff] [blame] | 754 | int old_good_bytes = good_bytes; |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 755 | drv = scsi_cmd_to_driver(cmd); |
| 756 | if (drv->done) |
| 757 | good_bytes = drv->done(cmd); |
James Bottomley | 427e59f | 2008-03-08 18:24:17 -0600 | [diff] [blame] | 758 | /* |
| 759 | * USB may not give sense identifying bad sector and |
| 760 | * simply return a residue instead, so subtract off the |
| 761 | * residue if drv->done() error processing indicates no |
| 762 | * change to the completion length. |
| 763 | */ |
| 764 | if (good_bytes == old_good_bytes) |
| 765 | good_bytes -= scsi_get_resid(cmd); |
Linus Torvalds | 7b3d954 | 2008-01-06 10:17:12 -0800 | [diff] [blame] | 766 | } |
| 767 | scsi_io_completion(cmd, good_bytes); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 770 | /** |
| 771 | * scsi_adjust_queue_depth - Let low level drivers change a device's queue depth |
| 772 | * @sdev: SCSI Device in question |
| 773 | * @tagged: Do we use tagged queueing (non-0) or do we treat |
| 774 | * this device as an untagged device (0) |
| 775 | * @tags: Number of tags allowed if tagged queueing enabled, |
| 776 | * or number of commands the low level driver can |
| 777 | * queue up in non-tagged mode (as per cmd_per_lun). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | * |
| 779 | * Returns: Nothing |
| 780 | * |
| 781 | * Lock Status: None held on entry |
| 782 | * |
| 783 | * Notes: Low level drivers may call this at any time and we will do |
| 784 | * the right thing depending on whether or not the device is |
| 785 | * currently active and whether or not it even has the |
| 786 | * command blocks built yet. |
| 787 | */ |
| 788 | void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) |
| 789 | { |
| 790 | unsigned long flags; |
| 791 | |
| 792 | /* |
| 793 | * refuse to set tagged depth to an unworkable size |
| 794 | */ |
| 795 | if (tags <= 0) |
| 796 | return; |
| 797 | |
| 798 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
| 799 | |
Mike Christie | 885ace9 | 2008-07-11 19:50:32 -0500 | [diff] [blame] | 800 | /* |
| 801 | * Check to see if the queue is managed by the block layer. |
| 802 | * If it is, and we fail to adjust the depth, exit. |
| 803 | * |
| 804 | * Do not resize the tag map if it is a host wide share bqt, |
| 805 | * because the size should be the hosts's can_queue. If there |
| 806 | * is more IO than the LLD's can_queue (so there are not enuogh |
| 807 | * tags) request_fn's host queue ready check will handle it. |
| 808 | */ |
| 809 | if (!sdev->host->bqt) { |
| 810 | if (blk_queue_tagged(sdev->request_queue) && |
| 811 | blk_queue_resize_tags(sdev->request_queue, tags) != 0) |
| 812 | goto out; |
| 813 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | sdev->queue_depth = tags; |
| 816 | switch (tagged) { |
Douglas Gilbert | cb23f91 | 2014-07-07 18:00:35 +0200 | [diff] [blame] | 817 | case 0: |
| 818 | sdev->ordered_tags = 0; |
| 819 | sdev->simple_tags = 0; |
| 820 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | case MSG_ORDERED_TAG: |
| 822 | sdev->ordered_tags = 1; |
| 823 | sdev->simple_tags = 1; |
| 824 | break; |
| 825 | case MSG_SIMPLE_TAG: |
| 826 | sdev->ordered_tags = 0; |
| 827 | sdev->simple_tags = 1; |
| 828 | break; |
| 829 | default: |
Douglas Gilbert | cb23f91 | 2014-07-07 18:00:35 +0200 | [diff] [blame] | 830 | sdev->ordered_tags = 0; |
| 831 | sdev->simple_tags = 0; |
James Bottomley | 9ccfc75 | 2005-10-02 11:45:08 -0500 | [diff] [blame] | 832 | sdev_printk(KERN_WARNING, sdev, |
| 833 | "scsi_adjust_queue_depth, bad queue type, " |
| 834 | "disabled\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | } |
| 836 | out: |
| 837 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); |
| 838 | } |
| 839 | EXPORT_SYMBOL(scsi_adjust_queue_depth); |
| 840 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 841 | /** |
| 842 | * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth |
| 843 | * @sdev: SCSI Device in question |
| 844 | * @depth: Current number of outstanding SCSI commands on this device, |
| 845 | * not counting the one returned as QUEUE_FULL. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 847 | * Description: This function will track successive QUEUE_FULL events on a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | * specific SCSI device to determine if and when there is a |
| 849 | * need to adjust the queue depth on the device. |
| 850 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 851 | * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | * -1 - Drop back to untagged operation using host->cmd_per_lun |
| 853 | * as the untagged command depth |
| 854 | * |
| 855 | * Lock Status: None held on entry |
| 856 | * |
| 857 | * Notes: Low level drivers may call this at any time and we will do |
| 858 | * "The Right Thing." We are interrupt context safe. |
| 859 | */ |
| 860 | int scsi_track_queue_full(struct scsi_device *sdev, int depth) |
| 861 | { |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 862 | |
| 863 | /* |
| 864 | * Don't let QUEUE_FULLs on the same |
| 865 | * jiffies count, they could all be from |
| 866 | * same event. |
| 867 | */ |
| 868 | if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | return 0; |
| 870 | |
Vasu Dev | 4a84067 | 2009-10-22 15:46:33 -0700 | [diff] [blame] | 871 | sdev->last_queue_full_time = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | if (sdev->last_queue_full_depth != depth) { |
| 873 | sdev->last_queue_full_count = 1; |
| 874 | sdev->last_queue_full_depth = depth; |
| 875 | } else { |
| 876 | sdev->last_queue_full_count++; |
| 877 | } |
| 878 | |
| 879 | if (sdev->last_queue_full_count <= 10) |
| 880 | return 0; |
| 881 | if (sdev->last_queue_full_depth < 8) { |
| 882 | /* Drop back to untagged */ |
| 883 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); |
| 884 | return -1; |
| 885 | } |
| 886 | |
| 887 | if (sdev->ordered_tags) |
| 888 | scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth); |
| 889 | else |
| 890 | scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); |
| 891 | return depth; |
| 892 | } |
| 893 | EXPORT_SYMBOL(scsi_track_queue_full); |
| 894 | |
| 895 | /** |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 896 | * scsi_vpd_inquiry - Request a device provide us with a VPD page |
| 897 | * @sdev: The device to ask |
| 898 | * @buffer: Where to put the result |
| 899 | * @page: Which Vital Product Data to return |
| 900 | * @len: The length of the buffer |
| 901 | * |
| 902 | * This is an internal helper function. You probably want to use |
| 903 | * scsi_get_vpd_page instead. |
| 904 | * |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 905 | * Returns size of the vpd page on success or a negative error number. |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 906 | */ |
| 907 | static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, |
| 908 | u8 page, unsigned len) |
| 909 | { |
| 910 | int result; |
| 911 | unsigned char cmd[16]; |
| 912 | |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 913 | if (len < 4) |
| 914 | return -EINVAL; |
| 915 | |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 916 | cmd[0] = INQUIRY; |
| 917 | cmd[1] = 1; /* EVPD */ |
| 918 | cmd[2] = page; |
| 919 | cmd[3] = len >> 8; |
| 920 | cmd[4] = len & 0xff; |
| 921 | cmd[5] = 0; /* Control byte */ |
| 922 | |
| 923 | /* |
| 924 | * I'm not convinced we need to try quite this hard to get VPD, but |
| 925 | * all the existing users tried this hard. |
| 926 | */ |
| 927 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, |
James Bottomley | 95a3639 | 2009-08-11 10:59:09 -0500 | [diff] [blame] | 928 | len, NULL, 30 * HZ, 3, NULL); |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 929 | if (result) |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 930 | return -EIO; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 931 | |
| 932 | /* Sanity check that we got the page back that we asked for */ |
| 933 | if (buffer[1] != page) |
| 934 | return -EIO; |
| 935 | |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 936 | return get_unaligned_be16(&buffer[2]) + 4; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | /** |
| 940 | * scsi_get_vpd_page - Get Vital Product Data from a SCSI device |
| 941 | * @sdev: The device to ask |
| 942 | * @page: Which Vital Product Data to return |
Randy Dunlap | 786f8ba | 2010-02-28 17:32:45 -0800 | [diff] [blame] | 943 | * @buf: where to store the VPD |
| 944 | * @buf_len: number of bytes in the VPD buffer area |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 945 | * |
| 946 | * SCSI devices may optionally supply Vital Product Data. Each 'page' |
| 947 | * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). |
| 948 | * If the device supports this VPD page, this routine returns a pointer |
| 949 | * to a buffer containing the data from that page. The caller is |
| 950 | * responsible for calling kfree() on this pointer when it is no longer |
| 951 | * needed. If we cannot retrieve the VPD page this routine returns %NULL. |
| 952 | */ |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 953 | int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, |
| 954 | int buf_len) |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 955 | { |
| 956 | int i, result; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 957 | |
Martin K. Petersen | 7562523 | 2013-07-30 22:58:34 -0400 | [diff] [blame] | 958 | if (sdev->skip_vpd_pages) |
| 959 | goto fail; |
| 960 | |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 961 | /* Ask for all the pages supported by this device */ |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 962 | result = scsi_vpd_inquiry(sdev, buf, 0, buf_len); |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 963 | if (result < 4) |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 964 | goto fail; |
| 965 | |
| 966 | /* If the user actually wanted this page, we can skip the rest */ |
| 967 | if (page == 0) |
Martin K. Petersen | 16d3ea2 | 2010-09-10 01:20:27 -0400 | [diff] [blame] | 968 | return 0; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 969 | |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 970 | for (i = 4; i < min(result, buf_len); i++) |
| 971 | if (buf[i] == page) |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 972 | goto found; |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 973 | |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 974 | if (i < result && i >= buf_len) |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 975 | /* ran off the end of the buffer, give us benefit of doubt */ |
| 976 | goto found; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 977 | /* The device claims it doesn't support the requested page */ |
| 978 | goto fail; |
| 979 | |
| 980 | found: |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 981 | result = scsi_vpd_inquiry(sdev, buf, page, buf_len); |
Hannes Reinecke | bc8945d | 2014-03-15 09:51:48 +0100 | [diff] [blame] | 982 | if (result < 0) |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 983 | goto fail; |
| 984 | |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 985 | return 0; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 986 | |
| 987 | fail: |
James Bottomley | e3deec0 | 2009-11-03 12:33:07 -0600 | [diff] [blame] | 988 | return -EINVAL; |
Matthew Wilcox | 881a256 | 2008-12-31 13:12:46 -0500 | [diff] [blame] | 989 | } |
| 990 | EXPORT_SYMBOL_GPL(scsi_get_vpd_page); |
| 991 | |
| 992 | /** |
Hannes Reinecke | b3ae878 | 2014-03-15 09:51:49 +0100 | [diff] [blame] | 993 | * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure |
| 994 | * @sdev: The device to ask |
| 995 | * |
| 996 | * Attach the 'Device Identification' VPD page (0x83) and the |
| 997 | * 'Unit Serial Number' VPD page (0x80) to a SCSI device |
| 998 | * structure. This information can be used to identify the device |
| 999 | * uniquely. |
| 1000 | */ |
| 1001 | void scsi_attach_vpd(struct scsi_device *sdev) |
| 1002 | { |
| 1003 | int result, i; |
| 1004 | int vpd_len = SCSI_VPD_PG_LEN; |
| 1005 | int pg80_supported = 0; |
| 1006 | int pg83_supported = 0; |
| 1007 | unsigned char *vpd_buf; |
| 1008 | |
| 1009 | if (sdev->skip_vpd_pages) |
| 1010 | return; |
| 1011 | retry_pg0: |
| 1012 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); |
| 1013 | if (!vpd_buf) |
| 1014 | return; |
| 1015 | |
| 1016 | /* Ask for all the pages supported by this device */ |
| 1017 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0, vpd_len); |
| 1018 | if (result < 0) { |
| 1019 | kfree(vpd_buf); |
| 1020 | return; |
| 1021 | } |
| 1022 | if (result > vpd_len) { |
| 1023 | vpd_len = result; |
| 1024 | kfree(vpd_buf); |
| 1025 | goto retry_pg0; |
| 1026 | } |
| 1027 | |
| 1028 | for (i = 4; i < result; i++) { |
| 1029 | if (vpd_buf[i] == 0x80) |
| 1030 | pg80_supported = 1; |
| 1031 | if (vpd_buf[i] == 0x83) |
| 1032 | pg83_supported = 1; |
| 1033 | } |
| 1034 | kfree(vpd_buf); |
| 1035 | vpd_len = SCSI_VPD_PG_LEN; |
| 1036 | |
| 1037 | if (pg80_supported) { |
| 1038 | retry_pg80: |
| 1039 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); |
| 1040 | if (!vpd_buf) |
| 1041 | return; |
| 1042 | |
| 1043 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0x80, vpd_len); |
| 1044 | if (result < 0) { |
| 1045 | kfree(vpd_buf); |
| 1046 | return; |
| 1047 | } |
| 1048 | if (result > vpd_len) { |
| 1049 | vpd_len = result; |
| 1050 | kfree(vpd_buf); |
| 1051 | goto retry_pg80; |
| 1052 | } |
| 1053 | sdev->vpd_pg80_len = result; |
| 1054 | sdev->vpd_pg80 = vpd_buf; |
| 1055 | vpd_len = SCSI_VPD_PG_LEN; |
| 1056 | } |
| 1057 | |
| 1058 | if (pg83_supported) { |
| 1059 | retry_pg83: |
| 1060 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); |
| 1061 | if (!vpd_buf) |
| 1062 | return; |
| 1063 | |
| 1064 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0x83, vpd_len); |
| 1065 | if (result < 0) { |
| 1066 | kfree(vpd_buf); |
| 1067 | return; |
| 1068 | } |
| 1069 | if (result > vpd_len) { |
| 1070 | vpd_len = result; |
| 1071 | kfree(vpd_buf); |
| 1072 | goto retry_pg83; |
| 1073 | } |
| 1074 | sdev->vpd_pg83_len = result; |
| 1075 | sdev->vpd_pg83 = vpd_buf; |
| 1076 | } |
| 1077 | } |
| 1078 | |
| 1079 | /** |
Martin K. Petersen | 3c6bdae | 2012-09-18 12:19:30 -0400 | [diff] [blame] | 1080 | * scsi_report_opcode - Find out if a given command opcode is supported |
| 1081 | * @sdev: scsi device to query |
| 1082 | * @buffer: scratch buffer (must be at least 20 bytes long) |
| 1083 | * @len: length of buffer |
| 1084 | * @opcode: opcode for command to look up |
| 1085 | * |
| 1086 | * Uses the REPORT SUPPORTED OPERATION CODES to look up the given |
Martin K. Petersen | 66c28f9 | 2013-06-06 22:15:55 -0400 | [diff] [blame] | 1087 | * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is |
| 1088 | * unsupported and 1 if the device claims to support the command. |
Martin K. Petersen | 3c6bdae | 2012-09-18 12:19:30 -0400 | [diff] [blame] | 1089 | */ |
| 1090 | int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, |
| 1091 | unsigned int len, unsigned char opcode) |
| 1092 | { |
| 1093 | unsigned char cmd[16]; |
| 1094 | struct scsi_sense_hdr sshdr; |
| 1095 | int result; |
| 1096 | |
| 1097 | if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) |
Martin K. Petersen | 66c28f9 | 2013-06-06 22:15:55 -0400 | [diff] [blame] | 1098 | return -EINVAL; |
Martin K. Petersen | 3c6bdae | 2012-09-18 12:19:30 -0400 | [diff] [blame] | 1099 | |
| 1100 | memset(cmd, 0, 16); |
| 1101 | cmd[0] = MAINTENANCE_IN; |
| 1102 | cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; |
| 1103 | cmd[2] = 1; /* One command format */ |
| 1104 | cmd[3] = opcode; |
| 1105 | put_unaligned_be32(len, &cmd[6]); |
| 1106 | memset(buffer, 0, len); |
| 1107 | |
| 1108 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, |
| 1109 | &sshdr, 30 * HZ, 3, NULL); |
| 1110 | |
| 1111 | if (result && scsi_sense_valid(&sshdr) && |
| 1112 | sshdr.sense_key == ILLEGAL_REQUEST && |
| 1113 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) |
Martin K. Petersen | 66c28f9 | 2013-06-06 22:15:55 -0400 | [diff] [blame] | 1114 | return -EINVAL; |
Martin K. Petersen | 3c6bdae | 2012-09-18 12:19:30 -0400 | [diff] [blame] | 1115 | |
| 1116 | if ((buffer[1] & 3) == 3) /* Command supported */ |
| 1117 | return 1; |
| 1118 | |
| 1119 | return 0; |
| 1120 | } |
| 1121 | EXPORT_SYMBOL(scsi_report_opcode); |
| 1122 | |
| 1123 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1124 | * scsi_device_get - get an additional reference to a scsi_device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | * @sdev: device to get a reference to |
| 1126 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1127 | * Description: Gets a reference to the scsi_device and increments the use count |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1128 | * of the underlying LLDD module. You must hold host_lock of the |
| 1129 | * parent Scsi_Host or already have a reference when calling this. |
| 1130 | */ |
| 1131 | int scsi_device_get(struct scsi_device *sdev) |
| 1132 | { |
James Bottomley | 85b6c72 | 2006-08-31 18:15:22 -0400 | [diff] [blame] | 1133 | if (sdev->sdev_state == SDEV_DEL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | return -ENXIO; |
| 1135 | if (!get_device(&sdev->sdev_gendev)) |
| 1136 | return -ENXIO; |
James Bottomley | 85b6c72 | 2006-08-31 18:15:22 -0400 | [diff] [blame] | 1137 | /* We can fail this if we're doing SCSI operations |
| 1138 | * from module exit (like cache flush) */ |
| 1139 | try_module_get(sdev->host->hostt->module); |
| 1140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1141 | return 0; |
| 1142 | } |
| 1143 | EXPORT_SYMBOL(scsi_device_get); |
| 1144 | |
| 1145 | /** |
| 1146 | * scsi_device_put - release a reference to a scsi_device |
| 1147 | * @sdev: device to release a reference on. |
| 1148 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1149 | * Description: Release a reference to the scsi_device and decrements the use |
| 1150 | * count of the underlying LLDD module. The device is freed once the last |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | * user vanishes. |
| 1152 | */ |
| 1153 | void scsi_device_put(struct scsi_device *sdev) |
| 1154 | { |
Ingo Molnar | 504fb37 | 2006-11-09 10:09:35 +0100 | [diff] [blame] | 1155 | #ifdef CONFIG_MODULE_UNLOAD |
James Bottomley | f479ab8 | 2006-09-06 09:00:29 -0500 | [diff] [blame] | 1156 | struct module *module = sdev->host->hostt->module; |
| 1157 | |
James Bottomley | 85b6c72 | 2006-08-31 18:15:22 -0400 | [diff] [blame] | 1158 | /* The module refcount will be zero if scsi_device_get() |
| 1159 | * was called from a module removal routine */ |
James Bottomley | f479ab8 | 2006-09-06 09:00:29 -0500 | [diff] [blame] | 1160 | if (module && module_refcount(module) != 0) |
| 1161 | module_put(module); |
Daniel Walker | a506b44 | 2006-09-09 09:31:03 -0700 | [diff] [blame] | 1162 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | put_device(&sdev->sdev_gendev); |
| 1164 | } |
| 1165 | EXPORT_SYMBOL(scsi_device_put); |
| 1166 | |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1167 | /* helper for shost_for_each_device, see that for documentation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, |
| 1169 | struct scsi_device *prev) |
| 1170 | { |
| 1171 | struct list_head *list = (prev ? &prev->siblings : &shost->__devices); |
| 1172 | struct scsi_device *next = NULL; |
| 1173 | unsigned long flags; |
| 1174 | |
| 1175 | spin_lock_irqsave(shost->host_lock, flags); |
| 1176 | while (list->next != &shost->__devices) { |
| 1177 | next = list_entry(list->next, struct scsi_device, siblings); |
| 1178 | /* skip devices that we can't get a reference to */ |
| 1179 | if (!scsi_device_get(next)) |
| 1180 | break; |
| 1181 | next = NULL; |
| 1182 | list = list->next; |
| 1183 | } |
| 1184 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 1185 | |
| 1186 | if (prev) |
| 1187 | scsi_device_put(prev); |
| 1188 | return next; |
| 1189 | } |
| 1190 | EXPORT_SYMBOL(__scsi_iterate_devices); |
| 1191 | |
| 1192 | /** |
| 1193 | * starget_for_each_device - helper to walk all devices of a target |
| 1194 | * @starget: target whose devices we want to iterate over. |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1195 | * @data: Opaque passed to each function call. |
| 1196 | * @fn: Function to call on each device |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | * |
Maciej W. Rozycki | 522939d | 2007-12-10 15:49:31 -0800 | [diff] [blame] | 1198 | * This traverses over each device of @starget. The devices have |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | * a reference that must be released by scsi_host_put when breaking |
| 1200 | * out of the loop. |
| 1201 | */ |
Maciej W. Rozycki | 522939d | 2007-12-10 15:49:31 -0800 | [diff] [blame] | 1202 | void starget_for_each_device(struct scsi_target *starget, void *data, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | void (*fn)(struct scsi_device *, void *)) |
| 1204 | { |
| 1205 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 1206 | struct scsi_device *sdev; |
| 1207 | |
| 1208 | shost_for_each_device(sdev, shost) { |
| 1209 | if ((sdev->channel == starget->channel) && |
| 1210 | (sdev->id == starget->id)) |
| 1211 | fn(sdev, data); |
| 1212 | } |
| 1213 | } |
| 1214 | EXPORT_SYMBOL(starget_for_each_device); |
| 1215 | |
| 1216 | /** |
Randy Dunlap | 14f501a | 2008-02-03 15:06:36 -0800 | [diff] [blame] | 1217 | * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) |
Maciej W. Rozycki | 522939d | 2007-12-10 15:49:31 -0800 | [diff] [blame] | 1218 | * @starget: target whose devices we want to iterate over. |
Randy Dunlap | 14f501a | 2008-02-03 15:06:36 -0800 | [diff] [blame] | 1219 | * @data: parameter for callback @fn() |
| 1220 | * @fn: callback function that is invoked for each device |
Maciej W. Rozycki | 522939d | 2007-12-10 15:49:31 -0800 | [diff] [blame] | 1221 | * |
| 1222 | * This traverses over each device of @starget. It does _not_ |
| 1223 | * take a reference on the scsi_device, so the whole loop must be |
| 1224 | * protected by shost->host_lock. |
| 1225 | * |
| 1226 | * Note: The only reason why drivers would want to use this is because |
| 1227 | * they need to access the device list in irq context. Otherwise you |
| 1228 | * really want to use starget_for_each_device instead. |
| 1229 | **/ |
| 1230 | void __starget_for_each_device(struct scsi_target *starget, void *data, |
| 1231 | void (*fn)(struct scsi_device *, void *)) |
| 1232 | { |
| 1233 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 1234 | struct scsi_device *sdev; |
| 1235 | |
| 1236 | __shost_for_each_device(sdev, shost) { |
| 1237 | if ((sdev->channel == starget->channel) && |
| 1238 | (sdev->id == starget->id)) |
| 1239 | fn(sdev, data); |
| 1240 | } |
| 1241 | } |
| 1242 | EXPORT_SYMBOL(__starget_for_each_device); |
| 1243 | |
| 1244 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1245 | * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) |
| 1246 | * @starget: SCSI target pointer |
| 1247 | * @lun: SCSI Logical Unit Number |
| 1248 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1249 | * Description: Looks up the scsi_device with the specified @lun for a given |
| 1250 | * @starget. The returned scsi_device does not have an additional |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | * reference. You must hold the host's host_lock over this call and |
Hannes Reinecke | 32aeef6 | 2009-01-13 16:50:37 +0100 | [diff] [blame] | 1252 | * any access to the returned scsi_device. A scsi_device in state |
| 1253 | * SDEV_DEL is skipped. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | * |
Randy Dunlap | dc8875e | 2007-11-15 15:42:30 -0800 | [diff] [blame] | 1255 | * Note: The only reason why drivers should use this is because |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1256 | * they need to access the device list in irq context. Otherwise you |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1257 | * really want to use scsi_device_lookup_by_target instead. |
| 1258 | **/ |
| 1259 | struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, |
Hannes Reinecke | 9cb78c1 | 2014-06-25 15:27:36 +0200 | [diff] [blame] | 1260 | u64 lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | { |
| 1262 | struct scsi_device *sdev; |
| 1263 | |
| 1264 | list_for_each_entry(sdev, &starget->devices, same_target_siblings) { |
Hannes Reinecke | 32aeef6 | 2009-01-13 16:50:37 +0100 | [diff] [blame] | 1265 | if (sdev->sdev_state == SDEV_DEL) |
| 1266 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | if (sdev->lun ==lun) |
| 1268 | return sdev; |
| 1269 | } |
| 1270 | |
| 1271 | return NULL; |
| 1272 | } |
| 1273 | EXPORT_SYMBOL(__scsi_device_lookup_by_target); |
| 1274 | |
| 1275 | /** |
| 1276 | * scsi_device_lookup_by_target - find a device given the target |
| 1277 | * @starget: SCSI target pointer |
| 1278 | * @lun: SCSI Logical Unit Number |
| 1279 | * |
Bartlomiej Zolnierkiewicz | 477e608 | 2009-04-27 20:54:22 +0200 | [diff] [blame] | 1280 | * Description: Looks up the scsi_device with the specified @lun for a given |
| 1281 | * @starget. The returned scsi_device has an additional reference that |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1282 | * needs to be released with scsi_device_put once you're done with it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | **/ |
| 1284 | struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, |
Hannes Reinecke | 9cb78c1 | 2014-06-25 15:27:36 +0200 | [diff] [blame] | 1285 | u64 lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | { |
| 1287 | struct scsi_device *sdev; |
| 1288 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); |
| 1289 | unsigned long flags; |
| 1290 | |
| 1291 | spin_lock_irqsave(shost->host_lock, flags); |
| 1292 | sdev = __scsi_device_lookup_by_target(starget, lun); |
| 1293 | if (sdev && scsi_device_get(sdev)) |
| 1294 | sdev = NULL; |
| 1295 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 1296 | |
| 1297 | return sdev; |
| 1298 | } |
| 1299 | EXPORT_SYMBOL(scsi_device_lookup_by_target); |
| 1300 | |
| 1301 | /** |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1302 | * __scsi_device_lookup - find a device given the host (UNLOCKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | * @shost: SCSI host pointer |
| 1304 | * @channel: SCSI channel (zero if only one channel) |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1305 | * @id: SCSI target number (physical unit number) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | * @lun: SCSI Logical Unit Number |
| 1307 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1308 | * Description: Looks up the scsi_device with the specified @channel, @id, @lun |
| 1309 | * for a given host. The returned scsi_device does not have an additional |
| 1310 | * reference. You must hold the host's host_lock over this call and any access |
| 1311 | * to the returned scsi_device. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | * |
| 1313 | * Note: The only reason why drivers would want to use this is because |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1314 | * they need to access the device list in irq context. Otherwise you |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | * really want to use scsi_device_lookup instead. |
| 1316 | **/ |
| 1317 | struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, |
Hannes Reinecke | 9cb78c1 | 2014-06-25 15:27:36 +0200 | [diff] [blame] | 1318 | uint channel, uint id, u64 lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | { |
| 1320 | struct scsi_device *sdev; |
| 1321 | |
| 1322 | list_for_each_entry(sdev, &shost->__devices, siblings) { |
| 1323 | if (sdev->channel == channel && sdev->id == id && |
| 1324 | sdev->lun ==lun) |
| 1325 | return sdev; |
| 1326 | } |
| 1327 | |
| 1328 | return NULL; |
| 1329 | } |
| 1330 | EXPORT_SYMBOL(__scsi_device_lookup); |
| 1331 | |
| 1332 | /** |
| 1333 | * scsi_device_lookup - find a device given the host |
| 1334 | * @shost: SCSI host pointer |
| 1335 | * @channel: SCSI channel (zero if only one channel) |
| 1336 | * @id: SCSI target number (physical unit number) |
| 1337 | * @lun: SCSI Logical Unit Number |
| 1338 | * |
Rob Landley | eb44820 | 2007-11-03 13:30:39 -0500 | [diff] [blame] | 1339 | * Description: Looks up the scsi_device with the specified @channel, @id, @lun |
| 1340 | * for a given host. The returned scsi_device has an additional reference that |
| 1341 | * needs to be released with scsi_device_put once you're done with it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | **/ |
| 1343 | struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, |
Hannes Reinecke | 9cb78c1 | 2014-06-25 15:27:36 +0200 | [diff] [blame] | 1344 | uint channel, uint id, u64 lun) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | { |
| 1346 | struct scsi_device *sdev; |
| 1347 | unsigned long flags; |
| 1348 | |
| 1349 | spin_lock_irqsave(shost->host_lock, flags); |
| 1350 | sdev = __scsi_device_lookup(shost, channel, id, lun); |
| 1351 | if (sdev && scsi_device_get(sdev)) |
| 1352 | sdev = NULL; |
| 1353 | spin_unlock_irqrestore(shost->host_lock, flags); |
| 1354 | |
| 1355 | return sdev; |
| 1356 | } |
| 1357 | EXPORT_SYMBOL(scsi_device_lookup); |
| 1358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1359 | MODULE_DESCRIPTION("SCSI core"); |
| 1360 | MODULE_LICENSE("GPL"); |
| 1361 | |
| 1362 | module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); |
| 1363 | MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); |
| 1364 | |
| 1365 | static int __init init_scsi(void) |
| 1366 | { |
Jens Axboe | 9bf09c2 | 2006-09-30 20:31:11 +0200 | [diff] [blame] | 1367 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | |
| 1369 | error = scsi_init_queue(); |
| 1370 | if (error) |
| 1371 | return error; |
| 1372 | error = scsi_init_procfs(); |
| 1373 | if (error) |
| 1374 | goto cleanup_queue; |
| 1375 | error = scsi_init_devinfo(); |
| 1376 | if (error) |
| 1377 | goto cleanup_procfs; |
| 1378 | error = scsi_init_hosts(); |
| 1379 | if (error) |
| 1380 | goto cleanup_devlist; |
| 1381 | error = scsi_init_sysctl(); |
| 1382 | if (error) |
| 1383 | goto cleanup_hosts; |
| 1384 | error = scsi_sysfs_register(); |
| 1385 | if (error) |
| 1386 | goto cleanup_sysctl; |
| 1387 | |
James Smart | 84314fd | 2006-08-18 17:30:09 -0400 | [diff] [blame] | 1388 | scsi_netlink_init(); |
| 1389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | printk(KERN_NOTICE "SCSI subsystem initialized\n"); |
| 1391 | return 0; |
| 1392 | |
| 1393 | cleanup_sysctl: |
| 1394 | scsi_exit_sysctl(); |
| 1395 | cleanup_hosts: |
| 1396 | scsi_exit_hosts(); |
| 1397 | cleanup_devlist: |
| 1398 | scsi_exit_devinfo(); |
| 1399 | cleanup_procfs: |
| 1400 | scsi_exit_procfs(); |
| 1401 | cleanup_queue: |
| 1402 | scsi_exit_queue(); |
| 1403 | printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", |
| 1404 | -error); |
| 1405 | return error; |
| 1406 | } |
| 1407 | |
| 1408 | static void __exit exit_scsi(void) |
| 1409 | { |
James Smart | 84314fd | 2006-08-18 17:30:09 -0400 | [diff] [blame] | 1410 | scsi_netlink_exit(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | scsi_sysfs_unregister(); |
| 1412 | scsi_exit_sysctl(); |
| 1413 | scsi_exit_hosts(); |
| 1414 | scsi_exit_devinfo(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | scsi_exit_procfs(); |
| 1416 | scsi_exit_queue(); |
Dan Williams | a468348 | 2012-07-09 19:33:30 -0700 | [diff] [blame] | 1417 | async_unregister_domain(&scsi_sd_probe_domain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | } |
| 1419 | |
| 1420 | subsys_initcall(init_scsi); |
| 1421 | module_exit(exit_scsi); |