109c434b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * scsi.c Copyright (C) 1992 Drew Eckhardt 41da177e4SLinus Torvalds * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 51da177e4SLinus Torvalds * Copyright (C) 2002, 2003 Christoph Hellwig 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * generic mid-level SCSI driver 81da177e4SLinus Torvalds * Initial versions: Drew Eckhardt 91da177e4SLinus Torvalds * Subsequent revisions: Eric Youngdale 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * <drew@colorado.edu> 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * Bug correction thanks go to : 141da177e4SLinus Torvalds * Rik Faith <faith@cs.unc.edu> 151da177e4SLinus Torvalds * Tommy Thorn <tthorn> 161da177e4SLinus Torvalds * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de> 171da177e4SLinus Torvalds * 181da177e4SLinus Torvalds * Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to 191da177e4SLinus Torvalds * add scatter-gather, multiple outstanding request, and other 201da177e4SLinus Torvalds * enhancements. 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * Native multichannel, wide scsi, /proc/scsi and hot plugging 231da177e4SLinus Torvalds * support added by Michael Neuffer <mike@i-connect.net> 241da177e4SLinus Torvalds * 251da177e4SLinus Torvalds * Added request_module("scsi_hostadapter") for kerneld: 261da177e4SLinus Torvalds * (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf) 271da177e4SLinus Torvalds * Bjorn Ekwall <bj0rn@blox.se> 281da177e4SLinus Torvalds * (changed to kmod) 291da177e4SLinus Torvalds * 301da177e4SLinus Torvalds * Major improvements to the timeout, abort, and reset processing, 311da177e4SLinus Torvalds * as well as performance modifications for large queue depths by 321da177e4SLinus Torvalds * Leonard N. Zubkoff <lnz@dandelion.com> 331da177e4SLinus Torvalds * 341da177e4SLinus Torvalds * Converted cli() code to spinlocks, Ingo Molnar 351da177e4SLinus Torvalds * 361da177e4SLinus Torvalds * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli 371da177e4SLinus Torvalds * 381da177e4SLinus Torvalds * out_of_space hacks, D. Gilbert (dpg) 990608 391da177e4SLinus Torvalds */ 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds #include <linux/module.h> 421da177e4SLinus Torvalds #include <linux/moduleparam.h> 431da177e4SLinus Torvalds #include <linux/kernel.h> 441da177e4SLinus Torvalds #include <linux/timer.h> 451da177e4SLinus Torvalds #include <linux/string.h> 461da177e4SLinus Torvalds #include <linux/slab.h> 471da177e4SLinus Torvalds #include <linux/blkdev.h> 481da177e4SLinus Torvalds #include <linux/delay.h> 491da177e4SLinus Torvalds #include <linux/init.h> 501da177e4SLinus Torvalds #include <linux/completion.h> 511da177e4SLinus Torvalds #include <linux/unistd.h> 521da177e4SLinus Torvalds #include <linux/spinlock.h> 531da177e4SLinus Torvalds #include <linux/kmod.h> 541da177e4SLinus Torvalds #include <linux/interrupt.h> 551da177e4SLinus Torvalds #include <linux/notifier.h> 561da177e4SLinus Torvalds #include <linux/cpu.h> 570b950672SArjan van de Ven #include <linux/mutex.h> 582955b47dSDan Williams #include <linux/async.h> 593c6bdaeaSMartin K. Petersen #include <asm/unaligned.h> 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds #include <scsi/scsi.h> 621da177e4SLinus Torvalds #include <scsi/scsi_cmnd.h> 631da177e4SLinus Torvalds #include <scsi/scsi_dbg.h> 641da177e4SLinus Torvalds #include <scsi/scsi_device.h> 657b3d9545SLinus Torvalds #include <scsi/scsi_driver.h> 661da177e4SLinus Torvalds #include <scsi/scsi_eh.h> 671da177e4SLinus Torvalds #include <scsi/scsi_host.h> 681da177e4SLinus Torvalds #include <scsi/scsi_tcq.h> 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds #include "scsi_priv.h" 711da177e4SLinus Torvalds #include "scsi_logging.h" 721da177e4SLinus Torvalds 73bf816235SKei Tokunaga #define CREATE_TRACE_POINTS 74bf816235SKei Tokunaga #include <trace/events/scsi.h> 75bf816235SKei Tokunaga 761da177e4SLinus Torvalds /* 771da177e4SLinus Torvalds * Definitions and constants. 781da177e4SLinus Torvalds */ 791da177e4SLinus Torvalds 801da177e4SLinus Torvalds /* 811da177e4SLinus Torvalds * Note - the initial logging level can be set here to log events at boot time. 821da177e4SLinus Torvalds * After the system is up, you may enable logging via the /proc interface. 831da177e4SLinus Torvalds */ 841da177e4SLinus Torvalds unsigned int scsi_logging_level; 851da177e4SLinus Torvalds #if defined(CONFIG_SCSI_LOGGING) 861da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_logging_level); 871da177e4SLinus Torvalds #endif 881da177e4SLinus Torvalds 893c31b52fSDan Williams /* 90f049cf1aSBart Van Assche * Domain for asynchronous system resume operations. It is marked 'exclusive' 91f049cf1aSBart Van Assche * to avoid being included in the async_synchronize_full() that is invoked by 92f049cf1aSBart Van Assche * dpm_resume(). 933c31b52fSDan Williams */ 943c31b52fSDan Williams ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain); 953c31b52fSDan Williams EXPORT_SYMBOL(scsi_sd_pm_domain); 963c31b52fSDan Williams 97eb44820cSRob Landley /** 98eb44820cSRob Landley * scsi_put_command - Free a scsi command block 99eb44820cSRob Landley * @cmd: command block to free 1001da177e4SLinus Torvalds * 1011da177e4SLinus Torvalds * Returns: Nothing. 1021da177e4SLinus Torvalds * 1031da177e4SLinus Torvalds * Notes: The command must not belong to any lists. 1041da177e4SLinus Torvalds */ 1051da177e4SLinus Torvalds void scsi_put_command(struct scsi_cmnd *cmd) 1061da177e4SLinus Torvalds { 1072dd6fb59SBart Van Assche scsi_del_cmd_from_list(cmd); 108fcc95a76SBart Van Assche BUG_ON(delayed_work_pending(&cmd->abort_work)); 109de25deb1SFUJITA Tomonori } 110de25deb1SFUJITA Tomonori 1111da177e4SLinus Torvalds #ifdef CONFIG_SCSI_LOGGING 1121da177e4SLinus Torvalds void scsi_log_send(struct scsi_cmnd *cmd) 1131da177e4SLinus Torvalds { 1141da177e4SLinus Torvalds unsigned int level; 1151da177e4SLinus Torvalds 1161da177e4SLinus Torvalds /* 1171da177e4SLinus Torvalds * If ML QUEUE log level is greater than or equal to: 1181da177e4SLinus Torvalds * 1191da177e4SLinus Torvalds * 1: nothing (match completion) 1201da177e4SLinus Torvalds * 121c11c004bSHannes Reinecke * 2: log opcode + command of all commands + cmd address 1221da177e4SLinus Torvalds * 123c11c004bSHannes Reinecke * 3: same as 2 1241da177e4SLinus Torvalds * 125a4a6afb4SHannes Reinecke * 4: same as 3 1261da177e4SLinus Torvalds */ 1271da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 1281da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, 1291da177e4SLinus Torvalds SCSI_LOG_MLQUEUE_BITS); 1301da177e4SLinus Torvalds if (level > 1) { 131c11c004bSHannes Reinecke scmd_printk(KERN_INFO, cmd, 132c11c004bSHannes Reinecke "Send: scmd 0x%p\n", cmd); 1331da177e4SLinus Torvalds scsi_print_command(cmd); 1341da177e4SLinus Torvalds } 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds } 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) 1391da177e4SLinus Torvalds { 1401da177e4SLinus Torvalds unsigned int level; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* 1431da177e4SLinus Torvalds * If ML COMPLETE log level is greater than or equal to: 1441da177e4SLinus Torvalds * 1451da177e4SLinus Torvalds * 1: log disposition, result, opcode + command, and conditionally 1461da177e4SLinus Torvalds * sense data for failures or non SUCCESS dispositions. 1471da177e4SLinus Torvalds * 1481da177e4SLinus Torvalds * 2: same as 1 but for all command completions. 1491da177e4SLinus Torvalds * 150c11c004bSHannes Reinecke * 3: same as 2 1511da177e4SLinus Torvalds * 1521da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 1531da177e4SLinus Torvalds */ 1541da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 1551da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, 1561da177e4SLinus Torvalds SCSI_LOG_MLCOMPLETE_BITS); 1571da177e4SLinus Torvalds if (((level > 0) && (cmd->result || disposition != SUCCESS)) || 1581da177e4SLinus Torvalds (level > 1)) { 159026f8da8SHannes Reinecke scsi_print_result(cmd, "Done", disposition); 1601da177e4SLinus Torvalds scsi_print_command(cmd); 161c65be1a6SJohannes Thumshirn if (status_byte(cmd->result) == CHECK_CONDITION) 162d811b848SHannes Reinecke scsi_print_sense(cmd); 163a4d04a4cSMartin K. Petersen if (level > 3) 164a4d04a4cSMartin K. Petersen scmd_printk(KERN_INFO, cmd, 165a4d04a4cSMartin K. Petersen "scsi host busy %d failed %d\n", 166c84b023aSMing Lei scsi_host_busy(cmd->device->host), 167a4d04a4cSMartin K. Petersen cmd->device->host->host_failed); 1681da177e4SLinus Torvalds } 1691da177e4SLinus Torvalds } 1701da177e4SLinus Torvalds } 1711da177e4SLinus Torvalds #endif 1721da177e4SLinus Torvalds 173eb44820cSRob Landley /** 174eb44820cSRob Landley * scsi_finish_command - cleanup and pass command back to upper layer 175eb44820cSRob Landley * @cmd: the command 1761da177e4SLinus Torvalds * 177eb44820cSRob Landley * Description: Pass command off to upper layer for finishing of I/O 1781da177e4SLinus Torvalds * request, waking processes that are waiting on results, 1791da177e4SLinus Torvalds * etc. 1801da177e4SLinus Torvalds */ 1811da177e4SLinus Torvalds void scsi_finish_command(struct scsi_cmnd *cmd) 1821da177e4SLinus Torvalds { 1831da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 184f0c0a376SMike Christie struct scsi_target *starget = scsi_target(sdev); 1851da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 1867b3d9545SLinus Torvalds struct scsi_driver *drv; 1877b3d9545SLinus Torvalds unsigned int good_bytes; 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds scsi_device_unbusy(sdev); 1901da177e4SLinus Torvalds 1911da177e4SLinus Torvalds /* 192cd9070c9SChristoph Hellwig * Clear the flags that say that the device/target/host is no longer 193cd9070c9SChristoph Hellwig * capable of accepting new commands. 1941da177e4SLinus Torvalds */ 195cd9070c9SChristoph Hellwig if (atomic_read(&shost->host_blocked)) 196cd9070c9SChristoph Hellwig atomic_set(&shost->host_blocked, 0); 197cd9070c9SChristoph Hellwig if (atomic_read(&starget->target_blocked)) 198cd9070c9SChristoph Hellwig atomic_set(&starget->target_blocked, 0); 199cd9070c9SChristoph Hellwig if (atomic_read(&sdev->device_blocked)) 200cd9070c9SChristoph Hellwig atomic_set(&sdev->device_blocked, 0); 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds /* 2031da177e4SLinus Torvalds * If we have valid sense information, then some kind of recovery 2041da177e4SLinus Torvalds * must have taken place. Make a note of this. 2051da177e4SLinus Torvalds */ 2061da177e4SLinus Torvalds if (SCSI_SENSE_VALID(cmd)) 2071da177e4SLinus Torvalds cmd->result |= (DRIVER_SENSE << 24); 2081da177e4SLinus Torvalds 2093bf743e7SJeff Garzik SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, 2103bf743e7SJeff Garzik "Notifying upper driver of completion " 2113bf743e7SJeff Garzik "(result %x)\n", cmd->result)); 2121da177e4SLinus Torvalds 213f18573abSFUJITA Tomonori good_bytes = scsi_bufflen(cmd); 21457292b58SChristoph Hellwig if (!blk_rq_is_passthrough(cmd->request)) { 215427e59f0SJames Bottomley int old_good_bytes = good_bytes; 2167b3d9545SLinus Torvalds drv = scsi_cmd_to_driver(cmd); 2177b3d9545SLinus Torvalds if (drv->done) 2187b3d9545SLinus Torvalds good_bytes = drv->done(cmd); 219427e59f0SJames Bottomley /* 220427e59f0SJames Bottomley * USB may not give sense identifying bad sector and 221427e59f0SJames Bottomley * simply return a residue instead, so subtract off the 222427e59f0SJames Bottomley * residue if drv->done() error processing indicates no 223427e59f0SJames Bottomley * change to the completion length. 224427e59f0SJames Bottomley */ 225427e59f0SJames Bottomley if (good_bytes == old_good_bytes) 226427e59f0SJames Bottomley good_bytes -= scsi_get_resid(cmd); 2277b3d9545SLinus Torvalds } 2287b3d9545SLinus Torvalds scsi_io_completion(cmd, good_bytes); 2291da177e4SLinus Torvalds } 2301da177e4SLinus Torvalds 231eb44820cSRob Landley /** 232db5ed4dfSChristoph Hellwig * scsi_change_queue_depth - change a device's queue depth 233eb44820cSRob Landley * @sdev: SCSI Device in question 234db5ed4dfSChristoph Hellwig * @depth: number of commands allowed to be queued to the driver 2351da177e4SLinus Torvalds * 236db5ed4dfSChristoph Hellwig * Sets the device queue depth and returns the new value. 2371da177e4SLinus Torvalds */ 238db5ed4dfSChristoph Hellwig int scsi_change_queue_depth(struct scsi_device *sdev, int depth) 2391da177e4SLinus Torvalds { 24064d513acSChristoph Hellwig if (depth > 0) { 24164d513acSChristoph Hellwig sdev->queue_depth = depth; 24264d513acSChristoph Hellwig wmb(); 243885ace9eSMike Christie } 2441da177e4SLinus Torvalds 245d278d4a8SJens Axboe if (sdev->request_queue) 246d278d4a8SJens Axboe blk_set_queue_depth(sdev->request_queue, depth); 247d278d4a8SJens Axboe 248db5ed4dfSChristoph Hellwig return sdev->queue_depth; 2491da177e4SLinus Torvalds } 250db5ed4dfSChristoph Hellwig EXPORT_SYMBOL(scsi_change_queue_depth); 2511da177e4SLinus Torvalds 252eb44820cSRob Landley /** 253eb44820cSRob Landley * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth 254eb44820cSRob Landley * @sdev: SCSI Device in question 255eb44820cSRob Landley * @depth: Current number of outstanding SCSI commands on this device, 256eb44820cSRob Landley * not counting the one returned as QUEUE_FULL. 2571da177e4SLinus Torvalds * 258eb44820cSRob Landley * Description: This function will track successive QUEUE_FULL events on a 2591da177e4SLinus Torvalds * specific SCSI device to determine if and when there is a 2601da177e4SLinus Torvalds * need to adjust the queue depth on the device. 2611da177e4SLinus Torvalds * 262eb44820cSRob Landley * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, 2631da177e4SLinus Torvalds * -1 - Drop back to untagged operation using host->cmd_per_lun 2641da177e4SLinus Torvalds * as the untagged command depth 2651da177e4SLinus Torvalds * 2661da177e4SLinus Torvalds * Lock Status: None held on entry 2671da177e4SLinus Torvalds * 2681da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 2691da177e4SLinus Torvalds * "The Right Thing." We are interrupt context safe. 2701da177e4SLinus Torvalds */ 2711da177e4SLinus Torvalds int scsi_track_queue_full(struct scsi_device *sdev, int depth) 2721da177e4SLinus Torvalds { 2734a84067dSVasu Dev 2744a84067dSVasu Dev /* 2754a84067dSVasu Dev * Don't let QUEUE_FULLs on the same 2764a84067dSVasu Dev * jiffies count, they could all be from 2774a84067dSVasu Dev * same event. 2784a84067dSVasu Dev */ 2794a84067dSVasu Dev if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) 2801da177e4SLinus Torvalds return 0; 2811da177e4SLinus Torvalds 2824a84067dSVasu Dev sdev->last_queue_full_time = jiffies; 2831da177e4SLinus Torvalds if (sdev->last_queue_full_depth != depth) { 2841da177e4SLinus Torvalds sdev->last_queue_full_count = 1; 2851da177e4SLinus Torvalds sdev->last_queue_full_depth = depth; 2861da177e4SLinus Torvalds } else { 2871da177e4SLinus Torvalds sdev->last_queue_full_count++; 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds if (sdev->last_queue_full_count <= 10) 2911da177e4SLinus Torvalds return 0; 2921da177e4SLinus Torvalds 293db5ed4dfSChristoph Hellwig return scsi_change_queue_depth(sdev, depth); 2941da177e4SLinus Torvalds } 2951da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_track_queue_full); 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds /** 298881a256dSMatthew Wilcox * scsi_vpd_inquiry - Request a device provide us with a VPD page 299881a256dSMatthew Wilcox * @sdev: The device to ask 300881a256dSMatthew Wilcox * @buffer: Where to put the result 301881a256dSMatthew Wilcox * @page: Which Vital Product Data to return 302881a256dSMatthew Wilcox * @len: The length of the buffer 303881a256dSMatthew Wilcox * 304881a256dSMatthew Wilcox * This is an internal helper function. You probably want to use 305881a256dSMatthew Wilcox * scsi_get_vpd_page instead. 306881a256dSMatthew Wilcox * 307bc8945dfSHannes Reinecke * Returns size of the vpd page on success or a negative error number. 308881a256dSMatthew Wilcox */ 309881a256dSMatthew Wilcox static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, 310881a256dSMatthew Wilcox u8 page, unsigned len) 311881a256dSMatthew Wilcox { 312881a256dSMatthew Wilcox int result; 313881a256dSMatthew Wilcox unsigned char cmd[16]; 314881a256dSMatthew Wilcox 315bc8945dfSHannes Reinecke if (len < 4) 316bc8945dfSHannes Reinecke return -EINVAL; 317bc8945dfSHannes Reinecke 318881a256dSMatthew Wilcox cmd[0] = INQUIRY; 319881a256dSMatthew Wilcox cmd[1] = 1; /* EVPD */ 320881a256dSMatthew Wilcox cmd[2] = page; 321881a256dSMatthew Wilcox cmd[3] = len >> 8; 322881a256dSMatthew Wilcox cmd[4] = len & 0xff; 323881a256dSMatthew Wilcox cmd[5] = 0; /* Control byte */ 324881a256dSMatthew Wilcox 325881a256dSMatthew Wilcox /* 326881a256dSMatthew Wilcox * I'm not convinced we need to try quite this hard to get VPD, but 327881a256dSMatthew Wilcox * all the existing users tried this hard. 328881a256dSMatthew Wilcox */ 329881a256dSMatthew Wilcox result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, 33095a3639eSJames Bottomley len, NULL, 30 * HZ, 3, NULL); 331881a256dSMatthew Wilcox if (result) 332bc8945dfSHannes Reinecke return -EIO; 333881a256dSMatthew Wilcox 334881a256dSMatthew Wilcox /* Sanity check that we got the page back that we asked for */ 335881a256dSMatthew Wilcox if (buffer[1] != page) 336881a256dSMatthew Wilcox return -EIO; 337881a256dSMatthew Wilcox 338bc8945dfSHannes Reinecke return get_unaligned_be16(&buffer[2]) + 4; 339881a256dSMatthew Wilcox } 340881a256dSMatthew Wilcox 341881a256dSMatthew Wilcox /** 342881a256dSMatthew Wilcox * scsi_get_vpd_page - Get Vital Product Data from a SCSI device 343881a256dSMatthew Wilcox * @sdev: The device to ask 344881a256dSMatthew Wilcox * @page: Which Vital Product Data to return 345786f8ba2SRandy Dunlap * @buf: where to store the VPD 346786f8ba2SRandy Dunlap * @buf_len: number of bytes in the VPD buffer area 347881a256dSMatthew Wilcox * 348881a256dSMatthew Wilcox * SCSI devices may optionally supply Vital Product Data. Each 'page' 349881a256dSMatthew Wilcox * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). 350881a256dSMatthew Wilcox * If the device supports this VPD page, this routine returns a pointer 351881a256dSMatthew Wilcox * to a buffer containing the data from that page. The caller is 352881a256dSMatthew Wilcox * responsible for calling kfree() on this pointer when it is no longer 353881a256dSMatthew Wilcox * needed. If we cannot retrieve the VPD page this routine returns %NULL. 354881a256dSMatthew Wilcox */ 355e3deec09SJames Bottomley int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, 356e3deec09SJames Bottomley int buf_len) 357881a256dSMatthew Wilcox { 358881a256dSMatthew Wilcox int i, result; 359881a256dSMatthew Wilcox 3607562523eSMartin K. Petersen if (sdev->skip_vpd_pages) 3617562523eSMartin K. Petersen goto fail; 3627562523eSMartin K. Petersen 363881a256dSMatthew Wilcox /* Ask for all the pages supported by this device */ 364e3deec09SJames Bottomley result = scsi_vpd_inquiry(sdev, buf, 0, buf_len); 365bc8945dfSHannes Reinecke if (result < 4) 366881a256dSMatthew Wilcox goto fail; 367881a256dSMatthew Wilcox 368881a256dSMatthew Wilcox /* If the user actually wanted this page, we can skip the rest */ 369881a256dSMatthew Wilcox if (page == 0) 37016d3ea26SMartin K. Petersen return 0; 371881a256dSMatthew Wilcox 372bc8945dfSHannes Reinecke for (i = 4; i < min(result, buf_len); i++) 373bc8945dfSHannes Reinecke if (buf[i] == page) 374881a256dSMatthew Wilcox goto found; 375e3deec09SJames Bottomley 376bc8945dfSHannes Reinecke if (i < result && i >= buf_len) 377e3deec09SJames Bottomley /* ran off the end of the buffer, give us benefit of doubt */ 378e3deec09SJames Bottomley goto found; 379881a256dSMatthew Wilcox /* The device claims it doesn't support the requested page */ 380881a256dSMatthew Wilcox goto fail; 381881a256dSMatthew Wilcox 382881a256dSMatthew Wilcox found: 383e3deec09SJames Bottomley result = scsi_vpd_inquiry(sdev, buf, page, buf_len); 384bc8945dfSHannes Reinecke if (result < 0) 385881a256dSMatthew Wilcox goto fail; 386881a256dSMatthew Wilcox 387e3deec09SJames Bottomley return 0; 388881a256dSMatthew Wilcox 389881a256dSMatthew Wilcox fail: 390e3deec09SJames Bottomley return -EINVAL; 391881a256dSMatthew Wilcox } 392881a256dSMatthew Wilcox EXPORT_SYMBOL_GPL(scsi_get_vpd_page); 393881a256dSMatthew Wilcox 394881a256dSMatthew Wilcox /** 3951e3f720aSBart Van Assche * scsi_get_vpd_buf - Get Vital Product Data from a SCSI device 3961e3f720aSBart Van Assche * @sdev: The device to ask 3971e3f720aSBart Van Assche * @page: Which Vital Product Data to return 3981e3f720aSBart Van Assche * 3991e3f720aSBart Van Assche * Returns %NULL upon failure. 4001e3f720aSBart Van Assche */ 401ccf1e004SBart Van Assche static struct scsi_vpd *scsi_get_vpd_buf(struct scsi_device *sdev, u8 page) 4021e3f720aSBart Van Assche { 403ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 4041e3f720aSBart Van Assche int vpd_len = SCSI_VPD_PG_LEN, result; 4051e3f720aSBart Van Assche 4061e3f720aSBart Van Assche retry_pg: 407ccf1e004SBart Van Assche vpd_buf = kmalloc(sizeof(*vpd_buf) + vpd_len, GFP_KERNEL); 4081e3f720aSBart Van Assche if (!vpd_buf) 4091e3f720aSBart Van Assche return NULL; 4101e3f720aSBart Van Assche 411ccf1e004SBart Van Assche result = scsi_vpd_inquiry(sdev, vpd_buf->data, page, vpd_len); 4121e3f720aSBart Van Assche if (result < 0) { 4131e3f720aSBart Van Assche kfree(vpd_buf); 4141e3f720aSBart Van Assche return NULL; 4151e3f720aSBart Van Assche } 4161e3f720aSBart Van Assche if (result > vpd_len) { 4171e3f720aSBart Van Assche vpd_len = result; 4181e3f720aSBart Van Assche kfree(vpd_buf); 4191e3f720aSBart Van Assche goto retry_pg; 4201e3f720aSBart Van Assche } 4211e3f720aSBart Van Assche 422ccf1e004SBart Van Assche vpd_buf->len = result; 4231e3f720aSBart Van Assche 4241e3f720aSBart Van Assche return vpd_buf; 4251e3f720aSBart Van Assche } 4261e3f720aSBart Van Assche 4271e3f720aSBart Van Assche static void scsi_update_vpd_page(struct scsi_device *sdev, u8 page, 428ccf1e004SBart Van Assche struct scsi_vpd __rcu **sdev_vpd_buf) 4291e3f720aSBart Van Assche { 430ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 4311e3f720aSBart Van Assche 432ccf1e004SBart Van Assche vpd_buf = scsi_get_vpd_buf(sdev, page); 4331e3f720aSBart Van Assche if (!vpd_buf) 4341e3f720aSBart Van Assche return; 4351e3f720aSBart Van Assche 4361e3f720aSBart Van Assche mutex_lock(&sdev->inquiry_mutex); 4371e3f720aSBart Van Assche rcu_swap_protected(*sdev_vpd_buf, vpd_buf, 4381e3f720aSBart Van Assche lockdep_is_held(&sdev->inquiry_mutex)); 4391e3f720aSBart Van Assche mutex_unlock(&sdev->inquiry_mutex); 4401e3f720aSBart Van Assche 441ccf1e004SBart Van Assche if (vpd_buf) 442ccf1e004SBart Van Assche kfree_rcu(vpd_buf, rcu); 4431e3f720aSBart Van Assche } 4441e3f720aSBart Van Assche 4451e3f720aSBart Van Assche /** 446b3ae8780SHannes Reinecke * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure 447b3ae8780SHannes Reinecke * @sdev: The device to ask 448b3ae8780SHannes Reinecke * 449b3ae8780SHannes Reinecke * Attach the 'Device Identification' VPD page (0x83) and the 450b3ae8780SHannes Reinecke * 'Unit Serial Number' VPD page (0x80) to a SCSI device 451b3ae8780SHannes Reinecke * structure. This information can be used to identify the device 452b3ae8780SHannes Reinecke * uniquely. 453b3ae8780SHannes Reinecke */ 454b3ae8780SHannes Reinecke void scsi_attach_vpd(struct scsi_device *sdev) 455b3ae8780SHannes Reinecke { 456ccf1e004SBart Van Assche int i; 457ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 458b3ae8780SHannes Reinecke 4595ddfe085SHannes Reinecke if (!scsi_device_supports_vpd(sdev)) 460b3ae8780SHannes Reinecke return; 4615ddfe085SHannes Reinecke 462b3ae8780SHannes Reinecke /* Ask for all the pages supported by this device */ 463ccf1e004SBart Van Assche vpd_buf = scsi_get_vpd_buf(sdev, 0); 4641e3f720aSBart Van Assche if (!vpd_buf) 465b3ae8780SHannes Reinecke return; 466b3ae8780SHannes Reinecke 467ccf1e004SBart Van Assche for (i = 4; i < vpd_buf->len; i++) { 468d188b067SRyan Attard if (vpd_buf->data[i] == 0x0) 469d188b067SRyan Attard scsi_update_vpd_page(sdev, 0x0, &sdev->vpd_pg0); 470ccf1e004SBart Van Assche if (vpd_buf->data[i] == 0x80) 471ccf1e004SBart Van Assche scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80); 472ccf1e004SBart Van Assche if (vpd_buf->data[i] == 0x83) 473ccf1e004SBart Van Assche scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83); 474d188b067SRyan Attard if (vpd_buf->data[i] == 0x89) 475d188b067SRyan Attard scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89); 476b3ae8780SHannes Reinecke } 477b3ae8780SHannes Reinecke kfree(vpd_buf); 478b3ae8780SHannes Reinecke } 479b3ae8780SHannes Reinecke 480b3ae8780SHannes Reinecke /** 4813c6bdaeaSMartin K. Petersen * scsi_report_opcode - Find out if a given command opcode is supported 4823c6bdaeaSMartin K. Petersen * @sdev: scsi device to query 4833c6bdaeaSMartin K. Petersen * @buffer: scratch buffer (must be at least 20 bytes long) 4843c6bdaeaSMartin K. Petersen * @len: length of buffer 4853c6bdaeaSMartin K. Petersen * @opcode: opcode for command to look up 4863c6bdaeaSMartin K. Petersen * 4873c6bdaeaSMartin K. Petersen * Uses the REPORT SUPPORTED OPERATION CODES to look up the given 48866c28f97SMartin K. Petersen * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is 48966c28f97SMartin K. Petersen * unsupported and 1 if the device claims to support the command. 4903c6bdaeaSMartin K. Petersen */ 4913c6bdaeaSMartin K. Petersen int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 4923c6bdaeaSMartin K. Petersen unsigned int len, unsigned char opcode) 4933c6bdaeaSMartin K. Petersen { 4943c6bdaeaSMartin K. Petersen unsigned char cmd[16]; 4953c6bdaeaSMartin K. Petersen struct scsi_sense_hdr sshdr; 4963c6bdaeaSMartin K. Petersen int result; 4973c6bdaeaSMartin K. Petersen 4983c6bdaeaSMartin K. Petersen if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) 49966c28f97SMartin K. Petersen return -EINVAL; 5003c6bdaeaSMartin K. Petersen 5013c6bdaeaSMartin K. Petersen memset(cmd, 0, 16); 5023c6bdaeaSMartin K. Petersen cmd[0] = MAINTENANCE_IN; 5033c6bdaeaSMartin K. Petersen cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; 5043c6bdaeaSMartin K. Petersen cmd[2] = 1; /* One command format */ 5053c6bdaeaSMartin K. Petersen cmd[3] = opcode; 5063c6bdaeaSMartin K. Petersen put_unaligned_be32(len, &cmd[6]); 5073c6bdaeaSMartin K. Petersen memset(buffer, 0, len); 5083c6bdaeaSMartin K. Petersen 5093c6bdaeaSMartin K. Petersen result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, 5103c6bdaeaSMartin K. Petersen &sshdr, 30 * HZ, 3, NULL); 5113c6bdaeaSMartin K. Petersen 5123c6bdaeaSMartin K. Petersen if (result && scsi_sense_valid(&sshdr) && 5133c6bdaeaSMartin K. Petersen sshdr.sense_key == ILLEGAL_REQUEST && 5143c6bdaeaSMartin K. Petersen (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) 51566c28f97SMartin K. Petersen return -EINVAL; 5163c6bdaeaSMartin K. Petersen 5173c6bdaeaSMartin K. Petersen if ((buffer[1] & 3) == 3) /* Command supported */ 5183c6bdaeaSMartin K. Petersen return 1; 5193c6bdaeaSMartin K. Petersen 5203c6bdaeaSMartin K. Petersen return 0; 5213c6bdaeaSMartin K. Petersen } 5223c6bdaeaSMartin K. Petersen EXPORT_SYMBOL(scsi_report_opcode); 5233c6bdaeaSMartin K. Petersen 5243c6bdaeaSMartin K. Petersen /** 525eb44820cSRob Landley * scsi_device_get - get an additional reference to a scsi_device 5261da177e4SLinus Torvalds * @sdev: device to get a reference to 5271da177e4SLinus Torvalds * 528eb44820cSRob Landley * Description: Gets a reference to the scsi_device and increments the use count 5291da177e4SLinus Torvalds * of the underlying LLDD module. You must hold host_lock of the 5301da177e4SLinus Torvalds * parent Scsi_Host or already have a reference when calling this. 531cff549e4SChristoph Hellwig * 532cff549e4SChristoph Hellwig * This will fail if a device is deleted or cancelled, or when the LLD module 533cff549e4SChristoph Hellwig * is in the process of being unloaded. 5341da177e4SLinus Torvalds */ 5351da177e4SLinus Torvalds int scsi_device_get(struct scsi_device *sdev) 5361da177e4SLinus Torvalds { 537cff549e4SChristoph Hellwig if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL) 538cff549e4SChristoph Hellwig goto fail; 5391da177e4SLinus Torvalds if (!get_device(&sdev->sdev_gendev)) 540cff549e4SChristoph Hellwig goto fail; 541cff549e4SChristoph Hellwig if (!try_module_get(sdev->host->hostt->module)) 542cff549e4SChristoph Hellwig goto fail_put_device; 5431da177e4SLinus Torvalds return 0; 544cff549e4SChristoph Hellwig 545cff549e4SChristoph Hellwig fail_put_device: 546cff549e4SChristoph Hellwig put_device(&sdev->sdev_gendev); 547cff549e4SChristoph Hellwig fail: 548cff549e4SChristoph Hellwig return -ENXIO; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_get); 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvalds /** 5531da177e4SLinus Torvalds * scsi_device_put - release a reference to a scsi_device 5541da177e4SLinus Torvalds * @sdev: device to release a reference on. 5551da177e4SLinus Torvalds * 556eb44820cSRob Landley * Description: Release a reference to the scsi_device and decrements the use 557eb44820cSRob Landley * count of the underlying LLDD module. The device is freed once the last 5581da177e4SLinus Torvalds * user vanishes. 5591da177e4SLinus Torvalds */ 5601da177e4SLinus Torvalds void scsi_device_put(struct scsi_device *sdev) 5611da177e4SLinus Torvalds { 562dc4515eaSRusty Russell module_put(sdev->host->hostt->module); 5631da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 5641da177e4SLinus Torvalds } 5651da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_put); 5661da177e4SLinus Torvalds 567eb44820cSRob Landley /* helper for shost_for_each_device, see that for documentation */ 5681da177e4SLinus Torvalds struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, 5691da177e4SLinus Torvalds struct scsi_device *prev) 5701da177e4SLinus Torvalds { 5711da177e4SLinus Torvalds struct list_head *list = (prev ? &prev->siblings : &shost->__devices); 5721da177e4SLinus Torvalds struct scsi_device *next = NULL; 5731da177e4SLinus Torvalds unsigned long flags; 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 5761da177e4SLinus Torvalds while (list->next != &shost->__devices) { 5771da177e4SLinus Torvalds next = list_entry(list->next, struct scsi_device, siblings); 5781da177e4SLinus Torvalds /* skip devices that we can't get a reference to */ 5791da177e4SLinus Torvalds if (!scsi_device_get(next)) 5801da177e4SLinus Torvalds break; 5811da177e4SLinus Torvalds next = NULL; 5821da177e4SLinus Torvalds list = list->next; 5831da177e4SLinus Torvalds } 5841da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 5851da177e4SLinus Torvalds 5861da177e4SLinus Torvalds if (prev) 5871da177e4SLinus Torvalds scsi_device_put(prev); 5881da177e4SLinus Torvalds return next; 5891da177e4SLinus Torvalds } 5901da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_iterate_devices); 5911da177e4SLinus Torvalds 5921da177e4SLinus Torvalds /** 5931da177e4SLinus Torvalds * starget_for_each_device - helper to walk all devices of a target 5941da177e4SLinus Torvalds * @starget: target whose devices we want to iterate over. 595eb44820cSRob Landley * @data: Opaque passed to each function call. 596eb44820cSRob Landley * @fn: Function to call on each device 5971da177e4SLinus Torvalds * 598522939d4SMaciej W. Rozycki * This traverses over each device of @starget. The devices have 5991da177e4SLinus Torvalds * a reference that must be released by scsi_host_put when breaking 6001da177e4SLinus Torvalds * out of the loop. 6011da177e4SLinus Torvalds */ 6021da177e4SLinus Torvalds void starget_for_each_device(struct scsi_target *starget, void *data, 6031da177e4SLinus Torvalds void (*fn)(struct scsi_device *, void *)) 6041da177e4SLinus Torvalds { 6051da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 6061da177e4SLinus Torvalds struct scsi_device *sdev; 6071da177e4SLinus Torvalds 6081da177e4SLinus Torvalds shost_for_each_device(sdev, shost) { 6091da177e4SLinus Torvalds if ((sdev->channel == starget->channel) && 6101da177e4SLinus Torvalds (sdev->id == starget->id)) 6111da177e4SLinus Torvalds fn(sdev, data); 6121da177e4SLinus Torvalds } 6131da177e4SLinus Torvalds } 6141da177e4SLinus Torvalds EXPORT_SYMBOL(starget_for_each_device); 6151da177e4SLinus Torvalds 6161da177e4SLinus Torvalds /** 61714f501a4SRandy Dunlap * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) 618522939d4SMaciej W. Rozycki * @starget: target whose devices we want to iterate over. 61914f501a4SRandy Dunlap * @data: parameter for callback @fn() 62014f501a4SRandy Dunlap * @fn: callback function that is invoked for each device 621522939d4SMaciej W. Rozycki * 622522939d4SMaciej W. Rozycki * This traverses over each device of @starget. It does _not_ 623522939d4SMaciej W. Rozycki * take a reference on the scsi_device, so the whole loop must be 624522939d4SMaciej W. Rozycki * protected by shost->host_lock. 625522939d4SMaciej W. Rozycki * 626522939d4SMaciej W. Rozycki * Note: The only reason why drivers would want to use this is because 627522939d4SMaciej W. Rozycki * they need to access the device list in irq context. Otherwise you 628522939d4SMaciej W. Rozycki * really want to use starget_for_each_device instead. 629522939d4SMaciej W. Rozycki **/ 630522939d4SMaciej W. Rozycki void __starget_for_each_device(struct scsi_target *starget, void *data, 631522939d4SMaciej W. Rozycki void (*fn)(struct scsi_device *, void *)) 632522939d4SMaciej W. Rozycki { 633522939d4SMaciej W. Rozycki struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 634522939d4SMaciej W. Rozycki struct scsi_device *sdev; 635522939d4SMaciej W. Rozycki 636522939d4SMaciej W. Rozycki __shost_for_each_device(sdev, shost) { 637522939d4SMaciej W. Rozycki if ((sdev->channel == starget->channel) && 638522939d4SMaciej W. Rozycki (sdev->id == starget->id)) 639522939d4SMaciej W. Rozycki fn(sdev, data); 640522939d4SMaciej W. Rozycki } 641522939d4SMaciej W. Rozycki } 642522939d4SMaciej W. Rozycki EXPORT_SYMBOL(__starget_for_each_device); 643522939d4SMaciej W. Rozycki 644522939d4SMaciej W. Rozycki /** 6451da177e4SLinus Torvalds * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) 6461da177e4SLinus Torvalds * @starget: SCSI target pointer 6471da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 6481da177e4SLinus Torvalds * 649eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @lun for a given 6501da177e4SLinus Torvalds * @starget. The returned scsi_device does not have an additional 6511da177e4SLinus Torvalds * reference. You must hold the host's host_lock over this call and 65232aeef60SHannes Reinecke * any access to the returned scsi_device. A scsi_device in state 65332aeef60SHannes Reinecke * SDEV_DEL is skipped. 6541da177e4SLinus Torvalds * 655dc8875e1SRandy Dunlap * Note: The only reason why drivers should use this is because 656eb44820cSRob Landley * they need to access the device list in irq context. Otherwise you 6571da177e4SLinus Torvalds * really want to use scsi_device_lookup_by_target instead. 6581da177e4SLinus Torvalds **/ 6591da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, 6609cb78c16SHannes Reinecke u64 lun) 6611da177e4SLinus Torvalds { 6621da177e4SLinus Torvalds struct scsi_device *sdev; 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds list_for_each_entry(sdev, &starget->devices, same_target_siblings) { 66532aeef60SHannes Reinecke if (sdev->sdev_state == SDEV_DEL) 66632aeef60SHannes Reinecke continue; 6671da177e4SLinus Torvalds if (sdev->lun ==lun) 6681da177e4SLinus Torvalds return sdev; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvalds return NULL; 6721da177e4SLinus Torvalds } 6731da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup_by_target); 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvalds /** 6761da177e4SLinus Torvalds * scsi_device_lookup_by_target - find a device given the target 6771da177e4SLinus Torvalds * @starget: SCSI target pointer 6781da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 6791da177e4SLinus Torvalds * 680477e608cSBartlomiej Zolnierkiewicz * Description: Looks up the scsi_device with the specified @lun for a given 681477e608cSBartlomiej Zolnierkiewicz * @starget. The returned scsi_device has an additional reference that 682eb44820cSRob Landley * needs to be released with scsi_device_put once you're done with it. 6831da177e4SLinus Torvalds **/ 6841da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, 6859cb78c16SHannes Reinecke u64 lun) 6861da177e4SLinus Torvalds { 6871da177e4SLinus Torvalds struct scsi_device *sdev; 6881da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 6891da177e4SLinus Torvalds unsigned long flags; 6901da177e4SLinus Torvalds 6911da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 6921da177e4SLinus Torvalds sdev = __scsi_device_lookup_by_target(starget, lun); 6931da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 6941da177e4SLinus Torvalds sdev = NULL; 6951da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvalds return sdev; 6981da177e4SLinus Torvalds } 6991da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup_by_target); 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /** 702eb44820cSRob Landley * __scsi_device_lookup - find a device given the host (UNLOCKED) 7031da177e4SLinus Torvalds * @shost: SCSI host pointer 7041da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 705eb44820cSRob Landley * @id: SCSI target number (physical unit number) 7061da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7071da177e4SLinus Torvalds * 708eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @channel, @id, @lun 709eb44820cSRob Landley * for a given host. The returned scsi_device does not have an additional 710eb44820cSRob Landley * reference. You must hold the host's host_lock over this call and any access 711eb44820cSRob Landley * to the returned scsi_device. 7121da177e4SLinus Torvalds * 7131da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 714eb44820cSRob Landley * they need to access the device list in irq context. Otherwise you 7151da177e4SLinus Torvalds * really want to use scsi_device_lookup instead. 7161da177e4SLinus Torvalds **/ 7171da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, 7189cb78c16SHannes Reinecke uint channel, uint id, u64 lun) 7191da177e4SLinus Torvalds { 7201da177e4SLinus Torvalds struct scsi_device *sdev; 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds list_for_each_entry(sdev, &shost->__devices, siblings) { 7234ff7adc8SZhou Zhengping if (sdev->sdev_state == SDEV_DEL) 7244ff7adc8SZhou Zhengping continue; 7251da177e4SLinus Torvalds if (sdev->channel == channel && sdev->id == id && 7261da177e4SLinus Torvalds sdev->lun ==lun) 7271da177e4SLinus Torvalds return sdev; 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvalds return NULL; 7311da177e4SLinus Torvalds } 7321da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup); 7331da177e4SLinus Torvalds 7341da177e4SLinus Torvalds /** 7351da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host 7361da177e4SLinus Torvalds * @shost: SCSI host pointer 7371da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 7381da177e4SLinus Torvalds * @id: SCSI target number (physical unit number) 7391da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7401da177e4SLinus Torvalds * 741eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @channel, @id, @lun 742eb44820cSRob Landley * for a given host. The returned scsi_device has an additional reference that 743eb44820cSRob Landley * needs to be released with scsi_device_put once you're done with it. 7441da177e4SLinus Torvalds **/ 7451da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, 7469cb78c16SHannes Reinecke uint channel, uint id, u64 lun) 7471da177e4SLinus Torvalds { 7481da177e4SLinus Torvalds struct scsi_device *sdev; 7491da177e4SLinus Torvalds unsigned long flags; 7501da177e4SLinus Torvalds 7511da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 7521da177e4SLinus Torvalds sdev = __scsi_device_lookup(shost, channel, id, lun); 7531da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 7541da177e4SLinus Torvalds sdev = NULL; 7551da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 7561da177e4SLinus Torvalds 7571da177e4SLinus Torvalds return sdev; 7581da177e4SLinus Torvalds } 7591da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup); 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds MODULE_DESCRIPTION("SCSI core"); 7621da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); 7651da177e4SLinus Torvalds MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); 7661da177e4SLinus Torvalds 767f664a3ccSJens Axboe /* This should go away in the future, it doesn't do anything anymore */ 76824c20f10SChristoph Hellwig bool scsi_use_blk_mq = true; 769d285203cSChristoph Hellwig module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO); 770d285203cSChristoph Hellwig 7711da177e4SLinus Torvalds static int __init init_scsi(void) 7721da177e4SLinus Torvalds { 7739bf09c23SJens Axboe int error; 7741da177e4SLinus Torvalds 7751da177e4SLinus Torvalds error = scsi_init_queue(); 7761da177e4SLinus Torvalds if (error) 7771da177e4SLinus Torvalds return error; 7781da177e4SLinus Torvalds error = scsi_init_procfs(); 7791da177e4SLinus Torvalds if (error) 7801da177e4SLinus Torvalds goto cleanup_queue; 7811da177e4SLinus Torvalds error = scsi_init_devinfo(); 7821da177e4SLinus Torvalds if (error) 7831da177e4SLinus Torvalds goto cleanup_procfs; 7841da177e4SLinus Torvalds error = scsi_init_hosts(); 7851da177e4SLinus Torvalds if (error) 7861da177e4SLinus Torvalds goto cleanup_devlist; 7871da177e4SLinus Torvalds error = scsi_init_sysctl(); 7881da177e4SLinus Torvalds if (error) 7891da177e4SLinus Torvalds goto cleanup_hosts; 7901da177e4SLinus Torvalds error = scsi_sysfs_register(); 7911da177e4SLinus Torvalds if (error) 7921da177e4SLinus Torvalds goto cleanup_sysctl; 7931da177e4SLinus Torvalds 79484314fd4SJames Smart scsi_netlink_init(); 79584314fd4SJames Smart 7961da177e4SLinus Torvalds printk(KERN_NOTICE "SCSI subsystem initialized\n"); 7971da177e4SLinus Torvalds return 0; 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvalds cleanup_sysctl: 8001da177e4SLinus Torvalds scsi_exit_sysctl(); 8011da177e4SLinus Torvalds cleanup_hosts: 8021da177e4SLinus Torvalds scsi_exit_hosts(); 8031da177e4SLinus Torvalds cleanup_devlist: 8041da177e4SLinus Torvalds scsi_exit_devinfo(); 8051da177e4SLinus Torvalds cleanup_procfs: 8061da177e4SLinus Torvalds scsi_exit_procfs(); 8071da177e4SLinus Torvalds cleanup_queue: 8081da177e4SLinus Torvalds scsi_exit_queue(); 8091da177e4SLinus Torvalds printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", 8101da177e4SLinus Torvalds -error); 8111da177e4SLinus Torvalds return error; 8121da177e4SLinus Torvalds } 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvalds static void __exit exit_scsi(void) 8151da177e4SLinus Torvalds { 81684314fd4SJames Smart scsi_netlink_exit(); 8171da177e4SLinus Torvalds scsi_sysfs_unregister(); 8181da177e4SLinus Torvalds scsi_exit_sysctl(); 8191da177e4SLinus Torvalds scsi_exit_hosts(); 8201da177e4SLinus Torvalds scsi_exit_devinfo(); 8211da177e4SLinus Torvalds scsi_exit_procfs(); 8221da177e4SLinus Torvalds scsi_exit_queue(); 8231da177e4SLinus Torvalds } 8241da177e4SLinus Torvalds 8251da177e4SLinus Torvalds subsys_initcall(init_scsi); 8261da177e4SLinus Torvalds module_exit(exit_scsi); 827