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 971da177e4SLinus Torvalds #ifdef CONFIG_SCSI_LOGGING 981da177e4SLinus Torvalds void scsi_log_send(struct scsi_cmnd *cmd) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds unsigned int level; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds /* 1031da177e4SLinus Torvalds * If ML QUEUE log level is greater than or equal to: 1041da177e4SLinus Torvalds * 1051da177e4SLinus Torvalds * 1: nothing (match completion) 1061da177e4SLinus Torvalds * 107c11c004bSHannes Reinecke * 2: log opcode + command of all commands + cmd address 1081da177e4SLinus Torvalds * 109c11c004bSHannes Reinecke * 3: same as 2 1101da177e4SLinus Torvalds * 111a4a6afb4SHannes Reinecke * 4: same as 3 1121da177e4SLinus Torvalds */ 1131da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 1141da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, 1151da177e4SLinus Torvalds SCSI_LOG_MLQUEUE_BITS); 1161da177e4SLinus Torvalds if (level > 1) { 117c11c004bSHannes Reinecke scmd_printk(KERN_INFO, cmd, 118c11c004bSHannes Reinecke "Send: scmd 0x%p\n", cmd); 1191da177e4SLinus Torvalds scsi_print_command(cmd); 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds } 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 1241da177e4SLinus Torvalds void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) 1251da177e4SLinus Torvalds { 1261da177e4SLinus Torvalds unsigned int level; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* 1291da177e4SLinus Torvalds * If ML COMPLETE log level is greater than or equal to: 1301da177e4SLinus Torvalds * 1311da177e4SLinus Torvalds * 1: log disposition, result, opcode + command, and conditionally 1321da177e4SLinus Torvalds * sense data for failures or non SUCCESS dispositions. 1331da177e4SLinus Torvalds * 1341da177e4SLinus Torvalds * 2: same as 1 but for all command completions. 1351da177e4SLinus Torvalds * 136c11c004bSHannes Reinecke * 3: same as 2 1371da177e4SLinus Torvalds * 1381da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 1391da177e4SLinus Torvalds */ 1401da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 1411da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, 1421da177e4SLinus Torvalds SCSI_LOG_MLCOMPLETE_BITS); 1431da177e4SLinus Torvalds if (((level > 0) && (cmd->result || disposition != SUCCESS)) || 1441da177e4SLinus Torvalds (level > 1)) { 145026f8da8SHannes Reinecke scsi_print_result(cmd, "Done", disposition); 1461da177e4SLinus Torvalds scsi_print_command(cmd); 147c65be1a6SJohannes Thumshirn if (status_byte(cmd->result) == CHECK_CONDITION) 148d811b848SHannes Reinecke scsi_print_sense(cmd); 149a4d04a4cSMartin K. Petersen if (level > 3) 150a4d04a4cSMartin K. Petersen scmd_printk(KERN_INFO, cmd, 151a4d04a4cSMartin K. Petersen "scsi host busy %d failed %d\n", 152c84b023aSMing Lei scsi_host_busy(cmd->device->host), 153a4d04a4cSMartin K. Petersen cmd->device->host->host_failed); 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds } 1571da177e4SLinus Torvalds #endif 1581da177e4SLinus Torvalds 159eb44820cSRob Landley /** 160eb44820cSRob Landley * scsi_finish_command - cleanup and pass command back to upper layer 161eb44820cSRob Landley * @cmd: the command 1621da177e4SLinus Torvalds * 163eb44820cSRob Landley * Description: Pass command off to upper layer for finishing of I/O 1641da177e4SLinus Torvalds * request, waking processes that are waiting on results, 1651da177e4SLinus Torvalds * etc. 1661da177e4SLinus Torvalds */ 1671da177e4SLinus Torvalds void scsi_finish_command(struct scsi_cmnd *cmd) 1681da177e4SLinus Torvalds { 1691da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 170f0c0a376SMike Christie struct scsi_target *starget = scsi_target(sdev); 1711da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 1727b3d9545SLinus Torvalds struct scsi_driver *drv; 1737b3d9545SLinus Torvalds unsigned int good_bytes; 1741da177e4SLinus Torvalds 1756eb045e0SMing Lei scsi_device_unbusy(sdev, cmd); 1761da177e4SLinus Torvalds 1771da177e4SLinus Torvalds /* 178cd9070c9SChristoph Hellwig * Clear the flags that say that the device/target/host is no longer 179cd9070c9SChristoph Hellwig * capable of accepting new commands. 1801da177e4SLinus Torvalds */ 181cd9070c9SChristoph Hellwig if (atomic_read(&shost->host_blocked)) 182cd9070c9SChristoph Hellwig atomic_set(&shost->host_blocked, 0); 183cd9070c9SChristoph Hellwig if (atomic_read(&starget->target_blocked)) 184cd9070c9SChristoph Hellwig atomic_set(&starget->target_blocked, 0); 185cd9070c9SChristoph Hellwig if (atomic_read(&sdev->device_blocked)) 186cd9070c9SChristoph Hellwig atomic_set(&sdev->device_blocked, 0); 1871da177e4SLinus Torvalds 1881da177e4SLinus Torvalds /* 1891da177e4SLinus Torvalds * If we have valid sense information, then some kind of recovery 1901da177e4SLinus Torvalds * must have taken place. Make a note of this. 1911da177e4SLinus Torvalds */ 1921da177e4SLinus Torvalds if (SCSI_SENSE_VALID(cmd)) 1931da177e4SLinus Torvalds cmd->result |= (DRIVER_SENSE << 24); 1941da177e4SLinus Torvalds 1953bf743e7SJeff Garzik SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, 1963bf743e7SJeff Garzik "Notifying upper driver of completion " 1973bf743e7SJeff Garzik "(result %x)\n", cmd->result)); 1981da177e4SLinus Torvalds 199f18573abSFUJITA Tomonori good_bytes = scsi_bufflen(cmd); 20057292b58SChristoph Hellwig if (!blk_rq_is_passthrough(cmd->request)) { 201427e59f0SJames Bottomley int old_good_bytes = good_bytes; 2027b3d9545SLinus Torvalds drv = scsi_cmd_to_driver(cmd); 2037b3d9545SLinus Torvalds if (drv->done) 2047b3d9545SLinus Torvalds good_bytes = drv->done(cmd); 205427e59f0SJames Bottomley /* 206427e59f0SJames Bottomley * USB may not give sense identifying bad sector and 207427e59f0SJames Bottomley * simply return a residue instead, so subtract off the 208427e59f0SJames Bottomley * residue if drv->done() error processing indicates no 209427e59f0SJames Bottomley * change to the completion length. 210427e59f0SJames Bottomley */ 211427e59f0SJames Bottomley if (good_bytes == old_good_bytes) 212427e59f0SJames Bottomley good_bytes -= scsi_get_resid(cmd); 2137b3d9545SLinus Torvalds } 2147b3d9545SLinus Torvalds scsi_io_completion(cmd, good_bytes); 2151da177e4SLinus Torvalds } 2161da177e4SLinus Torvalds 217*ca445321SMing Lei 218*ca445321SMing Lei /* 219*ca445321SMing Lei * 1024 is big enough for saturating the fast scsi LUN now 220*ca445321SMing Lei */ 221*ca445321SMing Lei static int scsi_device_max_queue_depth(struct scsi_device *sdev) 222*ca445321SMing Lei { 223*ca445321SMing Lei return max_t(int, sdev->host->can_queue, 1024); 224*ca445321SMing Lei } 225*ca445321SMing Lei 226eb44820cSRob Landley /** 227db5ed4dfSChristoph Hellwig * scsi_change_queue_depth - change a device's queue depth 228eb44820cSRob Landley * @sdev: SCSI Device in question 229db5ed4dfSChristoph Hellwig * @depth: number of commands allowed to be queued to the driver 2301da177e4SLinus Torvalds * 231db5ed4dfSChristoph Hellwig * Sets the device queue depth and returns the new value. 2321da177e4SLinus Torvalds */ 233db5ed4dfSChristoph Hellwig int scsi_change_queue_depth(struct scsi_device *sdev, int depth) 2341da177e4SLinus Torvalds { 235*ca445321SMing Lei depth = min_t(int, depth, scsi_device_max_queue_depth(sdev)); 236*ca445321SMing Lei 23764d513acSChristoph Hellwig if (depth > 0) { 23864d513acSChristoph Hellwig sdev->queue_depth = depth; 23964d513acSChristoph Hellwig wmb(); 240885ace9eSMike Christie } 2411da177e4SLinus Torvalds 242d278d4a8SJens Axboe if (sdev->request_queue) 243d278d4a8SJens Axboe blk_set_queue_depth(sdev->request_queue, depth); 244d278d4a8SJens Axboe 245db5ed4dfSChristoph Hellwig return sdev->queue_depth; 2461da177e4SLinus Torvalds } 247db5ed4dfSChristoph Hellwig EXPORT_SYMBOL(scsi_change_queue_depth); 2481da177e4SLinus Torvalds 249eb44820cSRob Landley /** 250eb44820cSRob Landley * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth 251eb44820cSRob Landley * @sdev: SCSI Device in question 252eb44820cSRob Landley * @depth: Current number of outstanding SCSI commands on this device, 253eb44820cSRob Landley * not counting the one returned as QUEUE_FULL. 2541da177e4SLinus Torvalds * 255eb44820cSRob Landley * Description: This function will track successive QUEUE_FULL events on a 2561da177e4SLinus Torvalds * specific SCSI device to determine if and when there is a 2571da177e4SLinus Torvalds * need to adjust the queue depth on the device. 2581da177e4SLinus Torvalds * 259eb44820cSRob Landley * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, 2601da177e4SLinus Torvalds * -1 - Drop back to untagged operation using host->cmd_per_lun 2611da177e4SLinus Torvalds * as the untagged command depth 2621da177e4SLinus Torvalds * 2631da177e4SLinus Torvalds * Lock Status: None held on entry 2641da177e4SLinus Torvalds * 2651da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 2661da177e4SLinus Torvalds * "The Right Thing." We are interrupt context safe. 2671da177e4SLinus Torvalds */ 2681da177e4SLinus Torvalds int scsi_track_queue_full(struct scsi_device *sdev, int depth) 2691da177e4SLinus Torvalds { 2704a84067dSVasu Dev 2714a84067dSVasu Dev /* 2724a84067dSVasu Dev * Don't let QUEUE_FULLs on the same 2734a84067dSVasu Dev * jiffies count, they could all be from 2744a84067dSVasu Dev * same event. 2754a84067dSVasu Dev */ 2764a84067dSVasu Dev if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) 2771da177e4SLinus Torvalds return 0; 2781da177e4SLinus Torvalds 2794a84067dSVasu Dev sdev->last_queue_full_time = jiffies; 2801da177e4SLinus Torvalds if (sdev->last_queue_full_depth != depth) { 2811da177e4SLinus Torvalds sdev->last_queue_full_count = 1; 2821da177e4SLinus Torvalds sdev->last_queue_full_depth = depth; 2831da177e4SLinus Torvalds } else { 2841da177e4SLinus Torvalds sdev->last_queue_full_count++; 2851da177e4SLinus Torvalds } 2861da177e4SLinus Torvalds 2871da177e4SLinus Torvalds if (sdev->last_queue_full_count <= 10) 2881da177e4SLinus Torvalds return 0; 2891da177e4SLinus Torvalds 290db5ed4dfSChristoph Hellwig return scsi_change_queue_depth(sdev, depth); 2911da177e4SLinus Torvalds } 2921da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_track_queue_full); 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvalds /** 295881a256dSMatthew Wilcox * scsi_vpd_inquiry - Request a device provide us with a VPD page 296881a256dSMatthew Wilcox * @sdev: The device to ask 297881a256dSMatthew Wilcox * @buffer: Where to put the result 298881a256dSMatthew Wilcox * @page: Which Vital Product Data to return 299881a256dSMatthew Wilcox * @len: The length of the buffer 300881a256dSMatthew Wilcox * 301881a256dSMatthew Wilcox * This is an internal helper function. You probably want to use 302881a256dSMatthew Wilcox * scsi_get_vpd_page instead. 303881a256dSMatthew Wilcox * 304bc8945dfSHannes Reinecke * Returns size of the vpd page on success or a negative error number. 305881a256dSMatthew Wilcox */ 306881a256dSMatthew Wilcox static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, 307881a256dSMatthew Wilcox u8 page, unsigned len) 308881a256dSMatthew Wilcox { 309881a256dSMatthew Wilcox int result; 310881a256dSMatthew Wilcox unsigned char cmd[16]; 311881a256dSMatthew Wilcox 312bc8945dfSHannes Reinecke if (len < 4) 313bc8945dfSHannes Reinecke return -EINVAL; 314bc8945dfSHannes Reinecke 315881a256dSMatthew Wilcox cmd[0] = INQUIRY; 316881a256dSMatthew Wilcox cmd[1] = 1; /* EVPD */ 317881a256dSMatthew Wilcox cmd[2] = page; 318881a256dSMatthew Wilcox cmd[3] = len >> 8; 319881a256dSMatthew Wilcox cmd[4] = len & 0xff; 320881a256dSMatthew Wilcox cmd[5] = 0; /* Control byte */ 321881a256dSMatthew Wilcox 322881a256dSMatthew Wilcox /* 323881a256dSMatthew Wilcox * I'm not convinced we need to try quite this hard to get VPD, but 324881a256dSMatthew Wilcox * all the existing users tried this hard. 325881a256dSMatthew Wilcox */ 326881a256dSMatthew Wilcox result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, 32795a3639eSJames Bottomley len, NULL, 30 * HZ, 3, NULL); 328881a256dSMatthew Wilcox if (result) 329bc8945dfSHannes Reinecke return -EIO; 330881a256dSMatthew Wilcox 331881a256dSMatthew Wilcox /* Sanity check that we got the page back that we asked for */ 332881a256dSMatthew Wilcox if (buffer[1] != page) 333881a256dSMatthew Wilcox return -EIO; 334881a256dSMatthew Wilcox 335bc8945dfSHannes Reinecke return get_unaligned_be16(&buffer[2]) + 4; 336881a256dSMatthew Wilcox } 337881a256dSMatthew Wilcox 338881a256dSMatthew Wilcox /** 339881a256dSMatthew Wilcox * scsi_get_vpd_page - Get Vital Product Data from a SCSI device 340881a256dSMatthew Wilcox * @sdev: The device to ask 341881a256dSMatthew Wilcox * @page: Which Vital Product Data to return 342786f8ba2SRandy Dunlap * @buf: where to store the VPD 343786f8ba2SRandy Dunlap * @buf_len: number of bytes in the VPD buffer area 344881a256dSMatthew Wilcox * 345881a256dSMatthew Wilcox * SCSI devices may optionally supply Vital Product Data. Each 'page' 346881a256dSMatthew Wilcox * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). 347881a256dSMatthew Wilcox * If the device supports this VPD page, this routine returns a pointer 348881a256dSMatthew Wilcox * to a buffer containing the data from that page. The caller is 349881a256dSMatthew Wilcox * responsible for calling kfree() on this pointer when it is no longer 350881a256dSMatthew Wilcox * needed. If we cannot retrieve the VPD page this routine returns %NULL. 351881a256dSMatthew Wilcox */ 352e3deec09SJames Bottomley int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, 353e3deec09SJames Bottomley int buf_len) 354881a256dSMatthew Wilcox { 355881a256dSMatthew Wilcox int i, result; 356881a256dSMatthew Wilcox 3577562523eSMartin K. Petersen if (sdev->skip_vpd_pages) 3587562523eSMartin K. Petersen goto fail; 3597562523eSMartin K. Petersen 360881a256dSMatthew Wilcox /* Ask for all the pages supported by this device */ 361e3deec09SJames Bottomley result = scsi_vpd_inquiry(sdev, buf, 0, buf_len); 362bc8945dfSHannes Reinecke if (result < 4) 363881a256dSMatthew Wilcox goto fail; 364881a256dSMatthew Wilcox 365881a256dSMatthew Wilcox /* If the user actually wanted this page, we can skip the rest */ 366881a256dSMatthew Wilcox if (page == 0) 36716d3ea26SMartin K. Petersen return 0; 368881a256dSMatthew Wilcox 369bc8945dfSHannes Reinecke for (i = 4; i < min(result, buf_len); i++) 370bc8945dfSHannes Reinecke if (buf[i] == page) 371881a256dSMatthew Wilcox goto found; 372e3deec09SJames Bottomley 373bc8945dfSHannes Reinecke if (i < result && i >= buf_len) 374e3deec09SJames Bottomley /* ran off the end of the buffer, give us benefit of doubt */ 375e3deec09SJames Bottomley goto found; 376881a256dSMatthew Wilcox /* The device claims it doesn't support the requested page */ 377881a256dSMatthew Wilcox goto fail; 378881a256dSMatthew Wilcox 379881a256dSMatthew Wilcox found: 380e3deec09SJames Bottomley result = scsi_vpd_inquiry(sdev, buf, page, buf_len); 381bc8945dfSHannes Reinecke if (result < 0) 382881a256dSMatthew Wilcox goto fail; 383881a256dSMatthew Wilcox 384e3deec09SJames Bottomley return 0; 385881a256dSMatthew Wilcox 386881a256dSMatthew Wilcox fail: 387e3deec09SJames Bottomley return -EINVAL; 388881a256dSMatthew Wilcox } 389881a256dSMatthew Wilcox EXPORT_SYMBOL_GPL(scsi_get_vpd_page); 390881a256dSMatthew Wilcox 391881a256dSMatthew Wilcox /** 3921e3f720aSBart Van Assche * scsi_get_vpd_buf - Get Vital Product Data from a SCSI device 3931e3f720aSBart Van Assche * @sdev: The device to ask 3941e3f720aSBart Van Assche * @page: Which Vital Product Data to return 3951e3f720aSBart Van Assche * 3961e3f720aSBart Van Assche * Returns %NULL upon failure. 3971e3f720aSBart Van Assche */ 398ccf1e004SBart Van Assche static struct scsi_vpd *scsi_get_vpd_buf(struct scsi_device *sdev, u8 page) 3991e3f720aSBart Van Assche { 400ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 4011e3f720aSBart Van Assche int vpd_len = SCSI_VPD_PG_LEN, result; 4021e3f720aSBart Van Assche 4031e3f720aSBart Van Assche retry_pg: 404ccf1e004SBart Van Assche vpd_buf = kmalloc(sizeof(*vpd_buf) + vpd_len, GFP_KERNEL); 4051e3f720aSBart Van Assche if (!vpd_buf) 4061e3f720aSBart Van Assche return NULL; 4071e3f720aSBart Van Assche 408ccf1e004SBart Van Assche result = scsi_vpd_inquiry(sdev, vpd_buf->data, page, vpd_len); 4091e3f720aSBart Van Assche if (result < 0) { 4101e3f720aSBart Van Assche kfree(vpd_buf); 4111e3f720aSBart Van Assche return NULL; 4121e3f720aSBart Van Assche } 4131e3f720aSBart Van Assche if (result > vpd_len) { 4141e3f720aSBart Van Assche vpd_len = result; 4151e3f720aSBart Van Assche kfree(vpd_buf); 4161e3f720aSBart Van Assche goto retry_pg; 4171e3f720aSBart Van Assche } 4181e3f720aSBart Van Assche 419ccf1e004SBart Van Assche vpd_buf->len = result; 4201e3f720aSBart Van Assche 4211e3f720aSBart Van Assche return vpd_buf; 4221e3f720aSBart Van Assche } 4231e3f720aSBart Van Assche 4241e3f720aSBart Van Assche static void scsi_update_vpd_page(struct scsi_device *sdev, u8 page, 425ccf1e004SBart Van Assche struct scsi_vpd __rcu **sdev_vpd_buf) 4261e3f720aSBart Van Assche { 427ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 4281e3f720aSBart Van Assche 429ccf1e004SBart Van Assche vpd_buf = scsi_get_vpd_buf(sdev, page); 4301e3f720aSBart Van Assche if (!vpd_buf) 4311e3f720aSBart Van Assche return; 4321e3f720aSBart Van Assche 4331e3f720aSBart Van Assche mutex_lock(&sdev->inquiry_mutex); 434c0eaf15cSPaul E. McKenney vpd_buf = rcu_replace_pointer(*sdev_vpd_buf, vpd_buf, 4351e3f720aSBart Van Assche lockdep_is_held(&sdev->inquiry_mutex)); 4361e3f720aSBart Van Assche mutex_unlock(&sdev->inquiry_mutex); 4371e3f720aSBart Van Assche 438ccf1e004SBart Van Assche if (vpd_buf) 439ccf1e004SBart Van Assche kfree_rcu(vpd_buf, rcu); 4401e3f720aSBart Van Assche } 4411e3f720aSBart Van Assche 4421e3f720aSBart Van Assche /** 443b3ae8780SHannes Reinecke * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure 444b3ae8780SHannes Reinecke * @sdev: The device to ask 445b3ae8780SHannes Reinecke * 446b3ae8780SHannes Reinecke * Attach the 'Device Identification' VPD page (0x83) and the 447b3ae8780SHannes Reinecke * 'Unit Serial Number' VPD page (0x80) to a SCSI device 448b3ae8780SHannes Reinecke * structure. This information can be used to identify the device 449b3ae8780SHannes Reinecke * uniquely. 450b3ae8780SHannes Reinecke */ 451b3ae8780SHannes Reinecke void scsi_attach_vpd(struct scsi_device *sdev) 452b3ae8780SHannes Reinecke { 453ccf1e004SBart Van Assche int i; 454ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 455b3ae8780SHannes Reinecke 4565ddfe085SHannes Reinecke if (!scsi_device_supports_vpd(sdev)) 457b3ae8780SHannes Reinecke return; 4585ddfe085SHannes Reinecke 459b3ae8780SHannes Reinecke /* Ask for all the pages supported by this device */ 460ccf1e004SBart Van Assche vpd_buf = scsi_get_vpd_buf(sdev, 0); 4611e3f720aSBart Van Assche if (!vpd_buf) 462b3ae8780SHannes Reinecke return; 463b3ae8780SHannes Reinecke 464ccf1e004SBart Van Assche for (i = 4; i < vpd_buf->len; i++) { 465d188b067SRyan Attard if (vpd_buf->data[i] == 0x0) 466d188b067SRyan Attard scsi_update_vpd_page(sdev, 0x0, &sdev->vpd_pg0); 467ccf1e004SBart Van Assche if (vpd_buf->data[i] == 0x80) 468ccf1e004SBart Van Assche scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80); 469ccf1e004SBart Van Assche if (vpd_buf->data[i] == 0x83) 470ccf1e004SBart Van Assche scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83); 471d188b067SRyan Attard if (vpd_buf->data[i] == 0x89) 472d188b067SRyan Attard scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89); 473b3ae8780SHannes Reinecke } 474b3ae8780SHannes Reinecke kfree(vpd_buf); 475b3ae8780SHannes Reinecke } 476b3ae8780SHannes Reinecke 477b3ae8780SHannes Reinecke /** 4783c6bdaeaSMartin K. Petersen * scsi_report_opcode - Find out if a given command opcode is supported 4793c6bdaeaSMartin K. Petersen * @sdev: scsi device to query 4803c6bdaeaSMartin K. Petersen * @buffer: scratch buffer (must be at least 20 bytes long) 4813c6bdaeaSMartin K. Petersen * @len: length of buffer 4823c6bdaeaSMartin K. Petersen * @opcode: opcode for command to look up 4833c6bdaeaSMartin K. Petersen * 4843c6bdaeaSMartin K. Petersen * Uses the REPORT SUPPORTED OPERATION CODES to look up the given 48566c28f97SMartin K. Petersen * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is 48666c28f97SMartin K. Petersen * unsupported and 1 if the device claims to support the command. 4873c6bdaeaSMartin K. Petersen */ 4883c6bdaeaSMartin K. Petersen int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 4893c6bdaeaSMartin K. Petersen unsigned int len, unsigned char opcode) 4903c6bdaeaSMartin K. Petersen { 4913c6bdaeaSMartin K. Petersen unsigned char cmd[16]; 4923c6bdaeaSMartin K. Petersen struct scsi_sense_hdr sshdr; 4933c6bdaeaSMartin K. Petersen int result; 4943c6bdaeaSMartin K. Petersen 4953c6bdaeaSMartin K. Petersen if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) 49666c28f97SMartin K. Petersen return -EINVAL; 4973c6bdaeaSMartin K. Petersen 4983c6bdaeaSMartin K. Petersen memset(cmd, 0, 16); 4993c6bdaeaSMartin K. Petersen cmd[0] = MAINTENANCE_IN; 5003c6bdaeaSMartin K. Petersen cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; 5013c6bdaeaSMartin K. Petersen cmd[2] = 1; /* One command format */ 5023c6bdaeaSMartin K. Petersen cmd[3] = opcode; 5033c6bdaeaSMartin K. Petersen put_unaligned_be32(len, &cmd[6]); 5043c6bdaeaSMartin K. Petersen memset(buffer, 0, len); 5053c6bdaeaSMartin K. Petersen 5063c6bdaeaSMartin K. Petersen result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, 5073c6bdaeaSMartin K. Petersen &sshdr, 30 * HZ, 3, NULL); 5083c6bdaeaSMartin K. Petersen 5093c6bdaeaSMartin K. Petersen if (result && scsi_sense_valid(&sshdr) && 5103c6bdaeaSMartin K. Petersen sshdr.sense_key == ILLEGAL_REQUEST && 5113c6bdaeaSMartin K. Petersen (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) 51266c28f97SMartin K. Petersen return -EINVAL; 5133c6bdaeaSMartin K. Petersen 5143c6bdaeaSMartin K. Petersen if ((buffer[1] & 3) == 3) /* Command supported */ 5153c6bdaeaSMartin K. Petersen return 1; 5163c6bdaeaSMartin K. Petersen 5173c6bdaeaSMartin K. Petersen return 0; 5183c6bdaeaSMartin K. Petersen } 5193c6bdaeaSMartin K. Petersen EXPORT_SYMBOL(scsi_report_opcode); 5203c6bdaeaSMartin K. Petersen 5213c6bdaeaSMartin K. Petersen /** 522eb44820cSRob Landley * scsi_device_get - get an additional reference to a scsi_device 5231da177e4SLinus Torvalds * @sdev: device to get a reference to 5241da177e4SLinus Torvalds * 525eb44820cSRob Landley * Description: Gets a reference to the scsi_device and increments the use count 5261da177e4SLinus Torvalds * of the underlying LLDD module. You must hold host_lock of the 5271da177e4SLinus Torvalds * parent Scsi_Host or already have a reference when calling this. 528cff549e4SChristoph Hellwig * 529cff549e4SChristoph Hellwig * This will fail if a device is deleted or cancelled, or when the LLD module 530cff549e4SChristoph Hellwig * is in the process of being unloaded. 5311da177e4SLinus Torvalds */ 5321da177e4SLinus Torvalds int scsi_device_get(struct scsi_device *sdev) 5331da177e4SLinus Torvalds { 534cff549e4SChristoph Hellwig if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL) 535cff549e4SChristoph Hellwig goto fail; 5361da177e4SLinus Torvalds if (!get_device(&sdev->sdev_gendev)) 537cff549e4SChristoph Hellwig goto fail; 538cff549e4SChristoph Hellwig if (!try_module_get(sdev->host->hostt->module)) 539cff549e4SChristoph Hellwig goto fail_put_device; 5401da177e4SLinus Torvalds return 0; 541cff549e4SChristoph Hellwig 542cff549e4SChristoph Hellwig fail_put_device: 543cff549e4SChristoph Hellwig put_device(&sdev->sdev_gendev); 544cff549e4SChristoph Hellwig fail: 545cff549e4SChristoph Hellwig return -ENXIO; 5461da177e4SLinus Torvalds } 5471da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_get); 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds /** 5501da177e4SLinus Torvalds * scsi_device_put - release a reference to a scsi_device 5511da177e4SLinus Torvalds * @sdev: device to release a reference on. 5521da177e4SLinus Torvalds * 553eb44820cSRob Landley * Description: Release a reference to the scsi_device and decrements the use 554eb44820cSRob Landley * count of the underlying LLDD module. The device is freed once the last 5551da177e4SLinus Torvalds * user vanishes. 5561da177e4SLinus Torvalds */ 5571da177e4SLinus Torvalds void scsi_device_put(struct scsi_device *sdev) 5581da177e4SLinus Torvalds { 559dc4515eaSRusty Russell module_put(sdev->host->hostt->module); 5601da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 5611da177e4SLinus Torvalds } 5621da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_put); 5631da177e4SLinus Torvalds 564eb44820cSRob Landley /* helper for shost_for_each_device, see that for documentation */ 5651da177e4SLinus Torvalds struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, 5661da177e4SLinus Torvalds struct scsi_device *prev) 5671da177e4SLinus Torvalds { 5681da177e4SLinus Torvalds struct list_head *list = (prev ? &prev->siblings : &shost->__devices); 5691da177e4SLinus Torvalds struct scsi_device *next = NULL; 5701da177e4SLinus Torvalds unsigned long flags; 5711da177e4SLinus Torvalds 5721da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 5731da177e4SLinus Torvalds while (list->next != &shost->__devices) { 5741da177e4SLinus Torvalds next = list_entry(list->next, struct scsi_device, siblings); 5751da177e4SLinus Torvalds /* skip devices that we can't get a reference to */ 5761da177e4SLinus Torvalds if (!scsi_device_get(next)) 5771da177e4SLinus Torvalds break; 5781da177e4SLinus Torvalds next = NULL; 5791da177e4SLinus Torvalds list = list->next; 5801da177e4SLinus Torvalds } 5811da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 5821da177e4SLinus Torvalds 5831da177e4SLinus Torvalds if (prev) 5841da177e4SLinus Torvalds scsi_device_put(prev); 5851da177e4SLinus Torvalds return next; 5861da177e4SLinus Torvalds } 5871da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_iterate_devices); 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvalds /** 5901da177e4SLinus Torvalds * starget_for_each_device - helper to walk all devices of a target 5911da177e4SLinus Torvalds * @starget: target whose devices we want to iterate over. 592eb44820cSRob Landley * @data: Opaque passed to each function call. 593eb44820cSRob Landley * @fn: Function to call on each device 5941da177e4SLinus Torvalds * 595522939d4SMaciej W. Rozycki * This traverses over each device of @starget. The devices have 5961da177e4SLinus Torvalds * a reference that must be released by scsi_host_put when breaking 5971da177e4SLinus Torvalds * out of the loop. 5981da177e4SLinus Torvalds */ 5991da177e4SLinus Torvalds void starget_for_each_device(struct scsi_target *starget, void *data, 6001da177e4SLinus Torvalds void (*fn)(struct scsi_device *, void *)) 6011da177e4SLinus Torvalds { 6021da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 6031da177e4SLinus Torvalds struct scsi_device *sdev; 6041da177e4SLinus Torvalds 6051da177e4SLinus Torvalds shost_for_each_device(sdev, shost) { 6061da177e4SLinus Torvalds if ((sdev->channel == starget->channel) && 6071da177e4SLinus Torvalds (sdev->id == starget->id)) 6081da177e4SLinus Torvalds fn(sdev, data); 6091da177e4SLinus Torvalds } 6101da177e4SLinus Torvalds } 6111da177e4SLinus Torvalds EXPORT_SYMBOL(starget_for_each_device); 6121da177e4SLinus Torvalds 6131da177e4SLinus Torvalds /** 61414f501a4SRandy Dunlap * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) 615522939d4SMaciej W. Rozycki * @starget: target whose devices we want to iterate over. 61614f501a4SRandy Dunlap * @data: parameter for callback @fn() 61714f501a4SRandy Dunlap * @fn: callback function that is invoked for each device 618522939d4SMaciej W. Rozycki * 619522939d4SMaciej W. Rozycki * This traverses over each device of @starget. It does _not_ 620522939d4SMaciej W. Rozycki * take a reference on the scsi_device, so the whole loop must be 621522939d4SMaciej W. Rozycki * protected by shost->host_lock. 622522939d4SMaciej W. Rozycki * 623522939d4SMaciej W. Rozycki * Note: The only reason why drivers would want to use this is because 624522939d4SMaciej W. Rozycki * they need to access the device list in irq context. Otherwise you 625522939d4SMaciej W. Rozycki * really want to use starget_for_each_device instead. 626522939d4SMaciej W. Rozycki **/ 627522939d4SMaciej W. Rozycki void __starget_for_each_device(struct scsi_target *starget, void *data, 628522939d4SMaciej W. Rozycki void (*fn)(struct scsi_device *, void *)) 629522939d4SMaciej W. Rozycki { 630522939d4SMaciej W. Rozycki struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 631522939d4SMaciej W. Rozycki struct scsi_device *sdev; 632522939d4SMaciej W. Rozycki 633522939d4SMaciej W. Rozycki __shost_for_each_device(sdev, shost) { 634522939d4SMaciej W. Rozycki if ((sdev->channel == starget->channel) && 635522939d4SMaciej W. Rozycki (sdev->id == starget->id)) 636522939d4SMaciej W. Rozycki fn(sdev, data); 637522939d4SMaciej W. Rozycki } 638522939d4SMaciej W. Rozycki } 639522939d4SMaciej W. Rozycki EXPORT_SYMBOL(__starget_for_each_device); 640522939d4SMaciej W. Rozycki 641522939d4SMaciej W. Rozycki /** 6421da177e4SLinus Torvalds * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) 6431da177e4SLinus Torvalds * @starget: SCSI target pointer 6441da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 6451da177e4SLinus Torvalds * 646eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @lun for a given 6471da177e4SLinus Torvalds * @starget. The returned scsi_device does not have an additional 6481da177e4SLinus Torvalds * reference. You must hold the host's host_lock over this call and 64932aeef60SHannes Reinecke * any access to the returned scsi_device. A scsi_device in state 65032aeef60SHannes Reinecke * SDEV_DEL is skipped. 6511da177e4SLinus Torvalds * 652dc8875e1SRandy Dunlap * Note: The only reason why drivers should use this is because 653eb44820cSRob Landley * they need to access the device list in irq context. Otherwise you 6541da177e4SLinus Torvalds * really want to use scsi_device_lookup_by_target instead. 6551da177e4SLinus Torvalds **/ 6561da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, 6579cb78c16SHannes Reinecke u64 lun) 6581da177e4SLinus Torvalds { 6591da177e4SLinus Torvalds struct scsi_device *sdev; 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds list_for_each_entry(sdev, &starget->devices, same_target_siblings) { 66232aeef60SHannes Reinecke if (sdev->sdev_state == SDEV_DEL) 66332aeef60SHannes Reinecke continue; 6641da177e4SLinus Torvalds if (sdev->lun ==lun) 6651da177e4SLinus Torvalds return sdev; 6661da177e4SLinus Torvalds } 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvalds return NULL; 6691da177e4SLinus Torvalds } 6701da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup_by_target); 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvalds /** 6731da177e4SLinus Torvalds * scsi_device_lookup_by_target - find a device given the target 6741da177e4SLinus Torvalds * @starget: SCSI target pointer 6751da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 6761da177e4SLinus Torvalds * 677477e608cSBartlomiej Zolnierkiewicz * Description: Looks up the scsi_device with the specified @lun for a given 678477e608cSBartlomiej Zolnierkiewicz * @starget. The returned scsi_device has an additional reference that 679eb44820cSRob Landley * needs to be released with scsi_device_put once you're done with it. 6801da177e4SLinus Torvalds **/ 6811da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, 6829cb78c16SHannes Reinecke u64 lun) 6831da177e4SLinus Torvalds { 6841da177e4SLinus Torvalds struct scsi_device *sdev; 6851da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 6861da177e4SLinus Torvalds unsigned long flags; 6871da177e4SLinus Torvalds 6881da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 6891da177e4SLinus Torvalds sdev = __scsi_device_lookup_by_target(starget, lun); 6901da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 6911da177e4SLinus Torvalds sdev = NULL; 6921da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 6931da177e4SLinus Torvalds 6941da177e4SLinus Torvalds return sdev; 6951da177e4SLinus Torvalds } 6961da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup_by_target); 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds /** 699eb44820cSRob Landley * __scsi_device_lookup - find a device given the host (UNLOCKED) 7001da177e4SLinus Torvalds * @shost: SCSI host pointer 7011da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 702eb44820cSRob Landley * @id: SCSI target number (physical unit number) 7031da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7041da177e4SLinus Torvalds * 705eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @channel, @id, @lun 706eb44820cSRob Landley * for a given host. The returned scsi_device does not have an additional 707eb44820cSRob Landley * reference. You must hold the host's host_lock over this call and any access 708eb44820cSRob Landley * to the returned scsi_device. 7091da177e4SLinus Torvalds * 7101da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 711eb44820cSRob Landley * they need to access the device list in irq context. Otherwise you 7121da177e4SLinus Torvalds * really want to use scsi_device_lookup instead. 7131da177e4SLinus Torvalds **/ 7141da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, 7159cb78c16SHannes Reinecke uint channel, uint id, u64 lun) 7161da177e4SLinus Torvalds { 7171da177e4SLinus Torvalds struct scsi_device *sdev; 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds list_for_each_entry(sdev, &shost->__devices, siblings) { 7204ff7adc8SZhou Zhengping if (sdev->sdev_state == SDEV_DEL) 7214ff7adc8SZhou Zhengping continue; 7221da177e4SLinus Torvalds if (sdev->channel == channel && sdev->id == id && 7231da177e4SLinus Torvalds sdev->lun ==lun) 7241da177e4SLinus Torvalds return sdev; 7251da177e4SLinus Torvalds } 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds return NULL; 7281da177e4SLinus Torvalds } 7291da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup); 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvalds /** 7321da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host 7331da177e4SLinus Torvalds * @shost: SCSI host pointer 7341da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 7351da177e4SLinus Torvalds * @id: SCSI target number (physical unit number) 7361da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7371da177e4SLinus Torvalds * 738eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @channel, @id, @lun 739eb44820cSRob Landley * for a given host. The returned scsi_device has an additional reference that 740eb44820cSRob Landley * needs to be released with scsi_device_put once you're done with it. 7411da177e4SLinus Torvalds **/ 7421da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, 7439cb78c16SHannes Reinecke uint channel, uint id, u64 lun) 7441da177e4SLinus Torvalds { 7451da177e4SLinus Torvalds struct scsi_device *sdev; 7461da177e4SLinus Torvalds unsigned long flags; 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 7491da177e4SLinus Torvalds sdev = __scsi_device_lookup(shost, channel, id, lun); 7501da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 7511da177e4SLinus Torvalds sdev = NULL; 7521da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 7531da177e4SLinus Torvalds 7541da177e4SLinus Torvalds return sdev; 7551da177e4SLinus Torvalds } 7561da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup); 7571da177e4SLinus Torvalds 7581da177e4SLinus Torvalds MODULE_DESCRIPTION("SCSI core"); 7591da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); 7621da177e4SLinus Torvalds MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds static int __init init_scsi(void) 7651da177e4SLinus Torvalds { 7669bf09c23SJens Axboe int error; 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds error = scsi_init_procfs(); 7691da177e4SLinus Torvalds if (error) 7701da177e4SLinus Torvalds goto cleanup_queue; 7711da177e4SLinus Torvalds error = scsi_init_devinfo(); 7721da177e4SLinus Torvalds if (error) 7731da177e4SLinus Torvalds goto cleanup_procfs; 7741da177e4SLinus Torvalds error = scsi_init_hosts(); 7751da177e4SLinus Torvalds if (error) 7761da177e4SLinus Torvalds goto cleanup_devlist; 7771da177e4SLinus Torvalds error = scsi_init_sysctl(); 7781da177e4SLinus Torvalds if (error) 7791da177e4SLinus Torvalds goto cleanup_hosts; 7801da177e4SLinus Torvalds error = scsi_sysfs_register(); 7811da177e4SLinus Torvalds if (error) 7821da177e4SLinus Torvalds goto cleanup_sysctl; 7831da177e4SLinus Torvalds 78484314fd4SJames Smart scsi_netlink_init(); 78584314fd4SJames Smart 7861da177e4SLinus Torvalds printk(KERN_NOTICE "SCSI subsystem initialized\n"); 7871da177e4SLinus Torvalds return 0; 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvalds cleanup_sysctl: 7901da177e4SLinus Torvalds scsi_exit_sysctl(); 7911da177e4SLinus Torvalds cleanup_hosts: 7921da177e4SLinus Torvalds scsi_exit_hosts(); 7931da177e4SLinus Torvalds cleanup_devlist: 7941da177e4SLinus Torvalds scsi_exit_devinfo(); 7951da177e4SLinus Torvalds cleanup_procfs: 7961da177e4SLinus Torvalds scsi_exit_procfs(); 7971da177e4SLinus Torvalds cleanup_queue: 7981da177e4SLinus Torvalds scsi_exit_queue(); 7991da177e4SLinus Torvalds printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", 8001da177e4SLinus Torvalds -error); 8011da177e4SLinus Torvalds return error; 8021da177e4SLinus Torvalds } 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds static void __exit exit_scsi(void) 8051da177e4SLinus Torvalds { 80684314fd4SJames Smart scsi_netlink_exit(); 8071da177e4SLinus Torvalds scsi_sysfs_unregister(); 8081da177e4SLinus Torvalds scsi_exit_sysctl(); 8091da177e4SLinus Torvalds scsi_exit_hosts(); 8101da177e4SLinus Torvalds scsi_exit_devinfo(); 8111da177e4SLinus Torvalds scsi_exit_procfs(); 8121da177e4SLinus Torvalds scsi_exit_queue(); 8131da177e4SLinus Torvalds } 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds subsys_initcall(init_scsi); 8161da177e4SLinus Torvalds module_exit(exit_scsi); 817