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> 583c6bdaeaSMartin K. Petersen #include <asm/unaligned.h> 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds #include <scsi/scsi.h> 611da177e4SLinus Torvalds #include <scsi/scsi_cmnd.h> 621da177e4SLinus Torvalds #include <scsi/scsi_dbg.h> 631da177e4SLinus Torvalds #include <scsi/scsi_device.h> 647b3d9545SLinus Torvalds #include <scsi/scsi_driver.h> 651da177e4SLinus Torvalds #include <scsi/scsi_eh.h> 661da177e4SLinus Torvalds #include <scsi/scsi_host.h> 671da177e4SLinus Torvalds #include <scsi/scsi_tcq.h> 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds #include "scsi_priv.h" 701da177e4SLinus Torvalds #include "scsi_logging.h" 711da177e4SLinus Torvalds 72bf816235SKei Tokunaga #define CREATE_TRACE_POINTS 73bf816235SKei Tokunaga #include <trace/events/scsi.h> 74bf816235SKei Tokunaga 751da177e4SLinus Torvalds /* 761da177e4SLinus Torvalds * Definitions and constants. 771da177e4SLinus Torvalds */ 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* 801da177e4SLinus Torvalds * Note - the initial logging level can be set here to log events at boot time. 811da177e4SLinus Torvalds * After the system is up, you may enable logging via the /proc interface. 821da177e4SLinus Torvalds */ 831da177e4SLinus Torvalds unsigned int scsi_logging_level; 841da177e4SLinus Torvalds #if defined(CONFIG_SCSI_LOGGING) 851da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_logging_level); 861da177e4SLinus Torvalds #endif 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds #ifdef CONFIG_SCSI_LOGGING 891da177e4SLinus Torvalds void scsi_log_send(struct scsi_cmnd *cmd) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds unsigned int level; 921da177e4SLinus Torvalds 931da177e4SLinus Torvalds /* 941da177e4SLinus Torvalds * If ML QUEUE log level is greater than or equal to: 951da177e4SLinus Torvalds * 961da177e4SLinus Torvalds * 1: nothing (match completion) 971da177e4SLinus Torvalds * 98c11c004bSHannes Reinecke * 2: log opcode + command of all commands + cmd address 991da177e4SLinus Torvalds * 100c11c004bSHannes Reinecke * 3: same as 2 1011da177e4SLinus Torvalds * 102a4a6afb4SHannes Reinecke * 4: same as 3 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 1051da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, 1061da177e4SLinus Torvalds SCSI_LOG_MLQUEUE_BITS); 1071da177e4SLinus Torvalds if (level > 1) { 108c11c004bSHannes Reinecke scmd_printk(KERN_INFO, cmd, 109c11c004bSHannes Reinecke "Send: scmd 0x%p\n", cmd); 1101da177e4SLinus Torvalds scsi_print_command(cmd); 1111da177e4SLinus Torvalds } 1121da177e4SLinus Torvalds } 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) 1161da177e4SLinus Torvalds { 1171da177e4SLinus Torvalds unsigned int level; 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds /* 1201da177e4SLinus Torvalds * If ML COMPLETE log level is greater than or equal to: 1211da177e4SLinus Torvalds * 1221da177e4SLinus Torvalds * 1: log disposition, result, opcode + command, and conditionally 1231da177e4SLinus Torvalds * sense data for failures or non SUCCESS dispositions. 1241da177e4SLinus Torvalds * 1251da177e4SLinus Torvalds * 2: same as 1 but for all command completions. 1261da177e4SLinus Torvalds * 127c11c004bSHannes Reinecke * 3: same as 2 1281da177e4SLinus Torvalds * 1291da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 1301da177e4SLinus Torvalds */ 1311da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 1321da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, 1331da177e4SLinus Torvalds SCSI_LOG_MLCOMPLETE_BITS); 1341da177e4SLinus Torvalds if (((level > 0) && (cmd->result || disposition != SUCCESS)) || 1351da177e4SLinus Torvalds (level > 1)) { 136026f8da8SHannes Reinecke scsi_print_result(cmd, "Done", disposition); 1371da177e4SLinus Torvalds scsi_print_command(cmd); 138d0672a03SHannes Reinecke if (scsi_status_is_check_condition(cmd->result)) 139d811b848SHannes Reinecke scsi_print_sense(cmd); 140a4d04a4cSMartin K. Petersen if (level > 3) 141a4d04a4cSMartin K. Petersen scmd_printk(KERN_INFO, cmd, 142a4d04a4cSMartin K. Petersen "scsi host busy %d failed %d\n", 143c84b023aSMing Lei scsi_host_busy(cmd->device->host), 144a4d04a4cSMartin K. Petersen cmd->device->host->host_failed); 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds #endif 1491da177e4SLinus Torvalds 150eb44820cSRob Landley /** 151eb44820cSRob Landley * scsi_finish_command - cleanup and pass command back to upper layer 152eb44820cSRob Landley * @cmd: the command 1531da177e4SLinus Torvalds * 154eb44820cSRob Landley * Description: Pass command off to upper layer for finishing of I/O 1551da177e4SLinus Torvalds * request, waking processes that are waiting on results, 1561da177e4SLinus Torvalds * etc. 1571da177e4SLinus Torvalds */ 1581da177e4SLinus Torvalds void scsi_finish_command(struct scsi_cmnd *cmd) 1591da177e4SLinus Torvalds { 1601da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 161f0c0a376SMike Christie struct scsi_target *starget = scsi_target(sdev); 1621da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 1637b3d9545SLinus Torvalds struct scsi_driver *drv; 1647b3d9545SLinus Torvalds unsigned int good_bytes; 1651da177e4SLinus Torvalds 1666eb045e0SMing Lei scsi_device_unbusy(sdev, cmd); 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvalds /* 169cd9070c9SChristoph Hellwig * Clear the flags that say that the device/target/host is no longer 170cd9070c9SChristoph Hellwig * capable of accepting new commands. 1711da177e4SLinus Torvalds */ 172cd9070c9SChristoph Hellwig if (atomic_read(&shost->host_blocked)) 173cd9070c9SChristoph Hellwig atomic_set(&shost->host_blocked, 0); 174cd9070c9SChristoph Hellwig if (atomic_read(&starget->target_blocked)) 175cd9070c9SChristoph Hellwig atomic_set(&starget->target_blocked, 0); 176cd9070c9SChristoph Hellwig if (atomic_read(&sdev->device_blocked)) 177cd9070c9SChristoph Hellwig atomic_set(&sdev->device_blocked, 0); 1781da177e4SLinus Torvalds 1793bf743e7SJeff Garzik SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, 1803bf743e7SJeff Garzik "Notifying upper driver of completion " 1813bf743e7SJeff Garzik "(result %x)\n", cmd->result)); 1821da177e4SLinus Torvalds 183f18573abSFUJITA Tomonori good_bytes = scsi_bufflen(cmd); 184aa8e25e5SBart Van Assche if (!blk_rq_is_passthrough(scsi_cmd_to_rq(cmd))) { 185427e59f0SJames Bottomley int old_good_bytes = good_bytes; 1867b3d9545SLinus Torvalds drv = scsi_cmd_to_driver(cmd); 1877b3d9545SLinus Torvalds if (drv->done) 1887b3d9545SLinus Torvalds good_bytes = drv->done(cmd); 189427e59f0SJames Bottomley /* 190427e59f0SJames Bottomley * USB may not give sense identifying bad sector and 191427e59f0SJames Bottomley * simply return a residue instead, so subtract off the 192427e59f0SJames Bottomley * residue if drv->done() error processing indicates no 193427e59f0SJames Bottomley * change to the completion length. 194427e59f0SJames Bottomley */ 195427e59f0SJames Bottomley if (good_bytes == old_good_bytes) 196427e59f0SJames Bottomley good_bytes -= scsi_get_resid(cmd); 1977b3d9545SLinus Torvalds } 1987b3d9545SLinus Torvalds scsi_io_completion(cmd, good_bytes); 1991da177e4SLinus Torvalds } 2001da177e4SLinus Torvalds 201ca445321SMing Lei 202ca445321SMing Lei /* 203f9bdac31SSumit Saxena * 4096 is big enough for saturating fast SCSI LUNs. 204ca445321SMing Lei */ 205020b0f0aSMing Lei int scsi_device_max_queue_depth(struct scsi_device *sdev) 206ca445321SMing Lei { 207f9bdac31SSumit Saxena return min_t(int, sdev->host->can_queue, 4096); 208ca445321SMing Lei } 209ca445321SMing Lei 210eb44820cSRob Landley /** 211db5ed4dfSChristoph Hellwig * scsi_change_queue_depth - change a device's queue depth 212eb44820cSRob Landley * @sdev: SCSI Device in question 213db5ed4dfSChristoph Hellwig * @depth: number of commands allowed to be queued to the driver 2141da177e4SLinus Torvalds * 215db5ed4dfSChristoph Hellwig * Sets the device queue depth and returns the new value. 2161da177e4SLinus Torvalds */ 217db5ed4dfSChristoph Hellwig int scsi_change_queue_depth(struct scsi_device *sdev, int depth) 2181da177e4SLinus Torvalds { 219ca445321SMing Lei depth = min_t(int, depth, scsi_device_max_queue_depth(sdev)); 220ca445321SMing Lei 22164d513acSChristoph Hellwig if (depth > 0) { 22264d513acSChristoph Hellwig sdev->queue_depth = depth; 22364d513acSChristoph Hellwig wmb(); 224885ace9eSMike Christie } 2251da177e4SLinus Torvalds 226d278d4a8SJens Axboe if (sdev->request_queue) 227d278d4a8SJens Axboe blk_set_queue_depth(sdev->request_queue, depth); 228d278d4a8SJens Axboe 229020b0f0aSMing Lei sbitmap_resize(&sdev->budget_map, sdev->queue_depth); 230020b0f0aSMing Lei 231db5ed4dfSChristoph Hellwig return sdev->queue_depth; 2321da177e4SLinus Torvalds } 233db5ed4dfSChristoph Hellwig EXPORT_SYMBOL(scsi_change_queue_depth); 2341da177e4SLinus Torvalds 235eb44820cSRob Landley /** 236eb44820cSRob Landley * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth 237eb44820cSRob Landley * @sdev: SCSI Device in question 238eb44820cSRob Landley * @depth: Current number of outstanding SCSI commands on this device, 239eb44820cSRob Landley * not counting the one returned as QUEUE_FULL. 2401da177e4SLinus Torvalds * 241eb44820cSRob Landley * Description: This function will track successive QUEUE_FULL events on a 2421da177e4SLinus Torvalds * specific SCSI device to determine if and when there is a 2431da177e4SLinus Torvalds * need to adjust the queue depth on the device. 2441da177e4SLinus Torvalds * 245eb44820cSRob Landley * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, 2461da177e4SLinus Torvalds * -1 - Drop back to untagged operation using host->cmd_per_lun 2471da177e4SLinus Torvalds * as the untagged command depth 2481da177e4SLinus Torvalds * 2491da177e4SLinus Torvalds * Lock Status: None held on entry 2501da177e4SLinus Torvalds * 2511da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 2521da177e4SLinus Torvalds * "The Right Thing." We are interrupt context safe. 2531da177e4SLinus Torvalds */ 2541da177e4SLinus Torvalds int scsi_track_queue_full(struct scsi_device *sdev, int depth) 2551da177e4SLinus Torvalds { 2564a84067dSVasu Dev 2574a84067dSVasu Dev /* 2584a84067dSVasu Dev * Don't let QUEUE_FULLs on the same 2594a84067dSVasu Dev * jiffies count, they could all be from 2604a84067dSVasu Dev * same event. 2614a84067dSVasu Dev */ 2624a84067dSVasu Dev if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) 2631da177e4SLinus Torvalds return 0; 2641da177e4SLinus Torvalds 2654a84067dSVasu Dev sdev->last_queue_full_time = jiffies; 2661da177e4SLinus Torvalds if (sdev->last_queue_full_depth != depth) { 2671da177e4SLinus Torvalds sdev->last_queue_full_count = 1; 2681da177e4SLinus Torvalds sdev->last_queue_full_depth = depth; 2691da177e4SLinus Torvalds } else { 2701da177e4SLinus Torvalds sdev->last_queue_full_count++; 2711da177e4SLinus Torvalds } 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvalds if (sdev->last_queue_full_count <= 10) 2741da177e4SLinus Torvalds return 0; 2751da177e4SLinus Torvalds 276db5ed4dfSChristoph Hellwig return scsi_change_queue_depth(sdev, depth); 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_track_queue_full); 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds /** 281881a256dSMatthew Wilcox * scsi_vpd_inquiry - Request a device provide us with a VPD page 282881a256dSMatthew Wilcox * @sdev: The device to ask 283881a256dSMatthew Wilcox * @buffer: Where to put the result 284881a256dSMatthew Wilcox * @page: Which Vital Product Data to return 285881a256dSMatthew Wilcox * @len: The length of the buffer 286881a256dSMatthew Wilcox * 287881a256dSMatthew Wilcox * This is an internal helper function. You probably want to use 288881a256dSMatthew Wilcox * scsi_get_vpd_page instead. 289881a256dSMatthew Wilcox * 290bc8945dfSHannes Reinecke * Returns size of the vpd page on success or a negative error number. 291881a256dSMatthew Wilcox */ 292881a256dSMatthew Wilcox static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, 293881a256dSMatthew Wilcox u8 page, unsigned len) 294881a256dSMatthew Wilcox { 295881a256dSMatthew Wilcox int result; 296881a256dSMatthew Wilcox unsigned char cmd[16]; 297881a256dSMatthew Wilcox 298bc8945dfSHannes Reinecke if (len < 4) 299bc8945dfSHannes Reinecke return -EINVAL; 300bc8945dfSHannes Reinecke 301881a256dSMatthew Wilcox cmd[0] = INQUIRY; 302881a256dSMatthew Wilcox cmd[1] = 1; /* EVPD */ 303881a256dSMatthew Wilcox cmd[2] = page; 304881a256dSMatthew Wilcox cmd[3] = len >> 8; 305881a256dSMatthew Wilcox cmd[4] = len & 0xff; 306881a256dSMatthew Wilcox cmd[5] = 0; /* Control byte */ 307881a256dSMatthew Wilcox 308881a256dSMatthew Wilcox /* 309881a256dSMatthew Wilcox * I'm not convinced we need to try quite this hard to get VPD, but 310881a256dSMatthew Wilcox * all the existing users tried this hard. 311881a256dSMatthew Wilcox */ 3127dfe0b5eSMike Christie result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buffer, len, 3137dfe0b5eSMike Christie 30 * HZ, 3, NULL); 314881a256dSMatthew Wilcox if (result) 315bc8945dfSHannes Reinecke return -EIO; 316881a256dSMatthew Wilcox 317f0aa59a3SDamien Le Moal /* 318f0aa59a3SDamien Le Moal * Sanity check that we got the page back that we asked for and that 319f0aa59a3SDamien Le Moal * the page size is not 0. 320f0aa59a3SDamien Le Moal */ 321881a256dSMatthew Wilcox if (buffer[1] != page) 322881a256dSMatthew Wilcox return -EIO; 323881a256dSMatthew Wilcox 324f0aa59a3SDamien Le Moal result = get_unaligned_be16(&buffer[2]); 325f0aa59a3SDamien Le Moal if (!result) 326f0aa59a3SDamien Le Moal return -EIO; 327f0aa59a3SDamien Le Moal 328f0aa59a3SDamien Le Moal return result + 4; 329881a256dSMatthew Wilcox } 330881a256dSMatthew Wilcox 331c92a6b5dSMartin K. Petersen static int scsi_get_vpd_size(struct scsi_device *sdev, u8 page) 332c92a6b5dSMartin K. Petersen { 333c92a6b5dSMartin K. Petersen unsigned char vpd_header[SCSI_VPD_HEADER_SIZE] __aligned(4); 334c92a6b5dSMartin K. Petersen int result; 335c92a6b5dSMartin K. Petersen 3364b1a2c2aSLee Duncan if (sdev->no_vpd_size) 3374b1a2c2aSLee Duncan return SCSI_DEFAULT_VPD_LEN; 3384b1a2c2aSLee Duncan 339c92a6b5dSMartin K. Petersen /* 340c92a6b5dSMartin K. Petersen * Fetch the VPD page header to find out how big the page 341c92a6b5dSMartin K. Petersen * is. This is done to prevent problems on legacy devices 342c92a6b5dSMartin K. Petersen * which can not handle allocation lengths as large as 343c92a6b5dSMartin K. Petersen * potentially requested by the caller. 344c92a6b5dSMartin K. Petersen */ 345c92a6b5dSMartin K. Petersen result = scsi_vpd_inquiry(sdev, vpd_header, page, sizeof(vpd_header)); 346c92a6b5dSMartin K. Petersen if (result < 0) 347c92a6b5dSMartin K. Petersen return 0; 348c92a6b5dSMartin K. Petersen 349c92a6b5dSMartin K. Petersen if (result < SCSI_VPD_HEADER_SIZE) { 350c92a6b5dSMartin K. Petersen dev_warn_once(&sdev->sdev_gendev, 351c92a6b5dSMartin K. Petersen "%s: short VPD page 0x%02x length: %d bytes\n", 352c92a6b5dSMartin K. Petersen __func__, page, result); 353c92a6b5dSMartin K. Petersen return 0; 354c92a6b5dSMartin K. Petersen } 355c92a6b5dSMartin K. Petersen 356c92a6b5dSMartin K. Petersen return result; 357c92a6b5dSMartin K. Petersen } 358c92a6b5dSMartin K. Petersen 359881a256dSMatthew Wilcox /** 360881a256dSMatthew Wilcox * scsi_get_vpd_page - Get Vital Product Data from a SCSI device 361881a256dSMatthew Wilcox * @sdev: The device to ask 362881a256dSMatthew Wilcox * @page: Which Vital Product Data to return 363786f8ba2SRandy Dunlap * @buf: where to store the VPD 364786f8ba2SRandy Dunlap * @buf_len: number of bytes in the VPD buffer area 365881a256dSMatthew Wilcox * 366881a256dSMatthew Wilcox * SCSI devices may optionally supply Vital Product Data. Each 'page' 367881a256dSMatthew Wilcox * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). 368c92a6b5dSMartin K. Petersen * If the device supports this VPD page, this routine fills @buf 369c92a6b5dSMartin K. Petersen * with the data from that page and return 0. If the VPD page is not 370c92a6b5dSMartin K. Petersen * supported or its content cannot be retrieved, -EINVAL is returned. 371881a256dSMatthew Wilcox */ 372e3deec09SJames Bottomley int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, 373e3deec09SJames Bottomley int buf_len) 374881a256dSMatthew Wilcox { 375c92a6b5dSMartin K. Petersen int result, vpd_len; 376881a256dSMatthew Wilcox 377c92a6b5dSMartin K. Petersen if (!scsi_device_supports_vpd(sdev)) 378e3deec09SJames Bottomley return -EINVAL; 379c92a6b5dSMartin K. Petersen 380c92a6b5dSMartin K. Petersen vpd_len = scsi_get_vpd_size(sdev, page); 381c92a6b5dSMartin K. Petersen if (vpd_len <= 0) 382c92a6b5dSMartin K. Petersen return -EINVAL; 383c92a6b5dSMartin K. Petersen 384c92a6b5dSMartin K. Petersen vpd_len = min(vpd_len, buf_len); 385c92a6b5dSMartin K. Petersen 386c92a6b5dSMartin K. Petersen /* 387c92a6b5dSMartin K. Petersen * Fetch the actual page. Since the appropriate size was reported 388c92a6b5dSMartin K. Petersen * by the device it is now safe to ask for something bigger. 389c92a6b5dSMartin K. Petersen */ 390c92a6b5dSMartin K. Petersen memset(buf, 0, buf_len); 391c92a6b5dSMartin K. Petersen result = scsi_vpd_inquiry(sdev, buf, page, vpd_len); 392c92a6b5dSMartin K. Petersen if (result < 0) 393c92a6b5dSMartin K. Petersen return -EINVAL; 394c92a6b5dSMartin K. Petersen else if (result > vpd_len) 395c92a6b5dSMartin K. Petersen dev_warn_once(&sdev->sdev_gendev, 396c92a6b5dSMartin K. Petersen "%s: VPD page 0x%02x result %d > %d bytes\n", 397c92a6b5dSMartin K. Petersen __func__, page, result, vpd_len); 398c92a6b5dSMartin K. Petersen 399c92a6b5dSMartin K. Petersen return 0; 400881a256dSMatthew Wilcox } 401881a256dSMatthew Wilcox EXPORT_SYMBOL_GPL(scsi_get_vpd_page); 402881a256dSMatthew Wilcox 403881a256dSMatthew Wilcox /** 4041e3f720aSBart Van Assche * scsi_get_vpd_buf - Get Vital Product Data from a SCSI device 4051e3f720aSBart Van Assche * @sdev: The device to ask 4061e3f720aSBart Van Assche * @page: Which Vital Product Data to return 4071e3f720aSBart Van Assche * 4081e3f720aSBart Van Assche * Returns %NULL upon failure. 4091e3f720aSBart Van Assche */ 410ccf1e004SBart Van Assche static struct scsi_vpd *scsi_get_vpd_buf(struct scsi_device *sdev, u8 page) 4111e3f720aSBart Van Assche { 412ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 413c92a6b5dSMartin K. Petersen int vpd_len, result; 414c92a6b5dSMartin K. Petersen 415c92a6b5dSMartin K. Petersen vpd_len = scsi_get_vpd_size(sdev, page); 416c92a6b5dSMartin K. Petersen if (vpd_len <= 0) 417c92a6b5dSMartin K. Petersen return NULL; 4181e3f720aSBart Van Assche 4191e3f720aSBart Van Assche retry_pg: 420c92a6b5dSMartin K. Petersen /* 421c92a6b5dSMartin K. Petersen * Fetch the actual page. Since the appropriate size was reported 422c92a6b5dSMartin K. Petersen * by the device it is now safe to ask for something bigger. 423c92a6b5dSMartin K. Petersen */ 424ccf1e004SBart Van Assche vpd_buf = kmalloc(sizeof(*vpd_buf) + vpd_len, GFP_KERNEL); 4251e3f720aSBart Van Assche if (!vpd_buf) 4261e3f720aSBart Van Assche return NULL; 4271e3f720aSBart Van Assche 428ccf1e004SBart Van Assche result = scsi_vpd_inquiry(sdev, vpd_buf->data, page, vpd_len); 4291e3f720aSBart Van Assche if (result < 0) { 4301e3f720aSBart Van Assche kfree(vpd_buf); 4311e3f720aSBart Van Assche return NULL; 4321e3f720aSBart Van Assche } 4331e3f720aSBart Van Assche if (result > vpd_len) { 434c92a6b5dSMartin K. Petersen dev_warn_once(&sdev->sdev_gendev, 435c92a6b5dSMartin K. Petersen "%s: VPD page 0x%02x result %d > %d bytes\n", 436c92a6b5dSMartin K. Petersen __func__, page, result, vpd_len); 4371e3f720aSBart Van Assche vpd_len = result; 4381e3f720aSBart Van Assche kfree(vpd_buf); 4391e3f720aSBart Van Assche goto retry_pg; 4401e3f720aSBart Van Assche } 4411e3f720aSBart Van Assche 442ccf1e004SBart Van Assche vpd_buf->len = result; 4431e3f720aSBart Van Assche 4441e3f720aSBart Van Assche return vpd_buf; 4451e3f720aSBart Van Assche } 4461e3f720aSBart Van Assche 4471e3f720aSBart Van Assche static void scsi_update_vpd_page(struct scsi_device *sdev, u8 page, 448ccf1e004SBart Van Assche struct scsi_vpd __rcu **sdev_vpd_buf) 4491e3f720aSBart Van Assche { 450ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 4511e3f720aSBart Van Assche 452ccf1e004SBart Van Assche vpd_buf = scsi_get_vpd_buf(sdev, page); 4531e3f720aSBart Van Assche if (!vpd_buf) 4541e3f720aSBart Van Assche return; 4551e3f720aSBart Van Assche 4561e3f720aSBart Van Assche mutex_lock(&sdev->inquiry_mutex); 457c0eaf15cSPaul E. McKenney vpd_buf = rcu_replace_pointer(*sdev_vpd_buf, vpd_buf, 4581e3f720aSBart Van Assche lockdep_is_held(&sdev->inquiry_mutex)); 4591e3f720aSBart Van Assche mutex_unlock(&sdev->inquiry_mutex); 4601e3f720aSBart Van Assche 461ccf1e004SBart Van Assche if (vpd_buf) 462ccf1e004SBart Van Assche kfree_rcu(vpd_buf, rcu); 4631e3f720aSBart Van Assche } 4641e3f720aSBart Van Assche 4651e3f720aSBart Van Assche /** 466b3ae8780SHannes Reinecke * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure 467b3ae8780SHannes Reinecke * @sdev: The device to ask 468b3ae8780SHannes Reinecke * 469b3ae8780SHannes Reinecke * Attach the 'Device Identification' VPD page (0x83) and the 470b3ae8780SHannes Reinecke * 'Unit Serial Number' VPD page (0x80) to a SCSI device 471b3ae8780SHannes Reinecke * structure. This information can be used to identify the device 472b3ae8780SHannes Reinecke * uniquely. 473b3ae8780SHannes Reinecke */ 474b3ae8780SHannes Reinecke void scsi_attach_vpd(struct scsi_device *sdev) 475b3ae8780SHannes Reinecke { 476ccf1e004SBart Van Assche int i; 477ccf1e004SBart Van Assche struct scsi_vpd *vpd_buf; 478b3ae8780SHannes Reinecke 4795ddfe085SHannes Reinecke if (!scsi_device_supports_vpd(sdev)) 480b3ae8780SHannes Reinecke return; 4815ddfe085SHannes Reinecke 482b3ae8780SHannes Reinecke /* Ask for all the pages supported by this device */ 483ccf1e004SBart Van Assche vpd_buf = scsi_get_vpd_buf(sdev, 0); 4841e3f720aSBart Van Assche if (!vpd_buf) 485b3ae8780SHannes Reinecke return; 486b3ae8780SHannes Reinecke 487ccf1e004SBart Van Assche for (i = 4; i < vpd_buf->len; i++) { 488d188b067SRyan Attard if (vpd_buf->data[i] == 0x0) 489d188b067SRyan Attard scsi_update_vpd_page(sdev, 0x0, &sdev->vpd_pg0); 490ccf1e004SBart Van Assche if (vpd_buf->data[i] == 0x80) 491ccf1e004SBart Van Assche scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80); 492ccf1e004SBart Van Assche if (vpd_buf->data[i] == 0x83) 493ccf1e004SBart Van Assche scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83); 494d188b067SRyan Attard if (vpd_buf->data[i] == 0x89) 495d188b067SRyan Attard scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89); 496e60ac0b9SMartin K. Petersen if (vpd_buf->data[i] == 0xb0) 497e60ac0b9SMartin K. Petersen scsi_update_vpd_page(sdev, 0xb0, &sdev->vpd_pgb0); 498e60ac0b9SMartin K. Petersen if (vpd_buf->data[i] == 0xb1) 499e60ac0b9SMartin K. Petersen scsi_update_vpd_page(sdev, 0xb1, &sdev->vpd_pgb1); 500e60ac0b9SMartin K. Petersen if (vpd_buf->data[i] == 0xb2) 501e60ac0b9SMartin K. Petersen scsi_update_vpd_page(sdev, 0xb2, &sdev->vpd_pgb2); 502b3ae8780SHannes Reinecke } 503b3ae8780SHannes Reinecke kfree(vpd_buf); 504b3ae8780SHannes Reinecke } 505b3ae8780SHannes Reinecke 506b3ae8780SHannes Reinecke /** 507*152e52fbSDamien Le Moal * scsi_report_opcode - Find out if a given command is supported 5083c6bdaeaSMartin K. Petersen * @sdev: scsi device to query 5093c6bdaeaSMartin K. Petersen * @buffer: scratch buffer (must be at least 20 bytes long) 5103c6bdaeaSMartin K. Petersen * @len: length of buffer 511*152e52fbSDamien Le Moal * @opcode: opcode for the command to look up 512*152e52fbSDamien Le Moal * @sa: service action for the command to look up 5133c6bdaeaSMartin K. Petersen * 514*152e52fbSDamien Le Moal * Uses the REPORT SUPPORTED OPERATION CODES to check support for the 515*152e52fbSDamien Le Moal * command identified with @opcode and @sa. If the command does not 516*152e52fbSDamien Le Moal * have a service action, @sa must be 0. Returns -EINVAL if RSOC fails, 517*152e52fbSDamien Le Moal * 0 if the command is not supported and 1 if the device claims to 518*152e52fbSDamien Le Moal * support the command. 5193c6bdaeaSMartin K. Petersen */ 5203c6bdaeaSMartin K. Petersen int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, 521*152e52fbSDamien Le Moal unsigned int len, unsigned char opcode, 522*152e52fbSDamien Le Moal unsigned short sa) 5233c6bdaeaSMartin K. Petersen { 5243c6bdaeaSMartin K. Petersen unsigned char cmd[16]; 5253c6bdaeaSMartin K. Petersen struct scsi_sense_hdr sshdr; 526e17d6340SMartin K. Petersen int result, request_len; 5277dfe0b5eSMike Christie const struct scsi_exec_args exec_args = { 5287dfe0b5eSMike Christie .sshdr = &sshdr, 5297dfe0b5eSMike Christie }; 5303c6bdaeaSMartin K. Petersen 5313c6bdaeaSMartin K. Petersen if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) 53266c28f97SMartin K. Petersen return -EINVAL; 5333c6bdaeaSMartin K. Petersen 534e17d6340SMartin K. Petersen /* RSOC header + size of command we are asking about */ 535e17d6340SMartin K. Petersen request_len = 4 + COMMAND_SIZE(opcode); 536e17d6340SMartin K. Petersen if (request_len > len) { 537e17d6340SMartin K. Petersen dev_warn_once(&sdev->sdev_gendev, 538e17d6340SMartin K. Petersen "%s: len %u bytes, opcode 0x%02x needs %u\n", 539e17d6340SMartin K. Petersen __func__, len, opcode, request_len); 540e17d6340SMartin K. Petersen return -EINVAL; 541e17d6340SMartin K. Petersen } 542e17d6340SMartin K. Petersen 5433c6bdaeaSMartin K. Petersen memset(cmd, 0, 16); 5443c6bdaeaSMartin K. Petersen cmd[0] = MAINTENANCE_IN; 5453c6bdaeaSMartin K. Petersen cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; 546*152e52fbSDamien Le Moal if (!sa) { 5473c6bdaeaSMartin K. Petersen cmd[2] = 1; /* One command format */ 5483c6bdaeaSMartin K. Petersen cmd[3] = opcode; 549*152e52fbSDamien Le Moal } else { 550*152e52fbSDamien Le Moal cmd[2] = 3; /* One command format with service action */ 551*152e52fbSDamien Le Moal cmd[3] = opcode; 552*152e52fbSDamien Le Moal put_unaligned_be16(sa, &cmd[4]); 553*152e52fbSDamien Le Moal } 554e17d6340SMartin K. Petersen put_unaligned_be32(request_len, &cmd[6]); 5553c6bdaeaSMartin K. Petersen memset(buffer, 0, len); 5563c6bdaeaSMartin K. Petersen 5577dfe0b5eSMike Christie result = scsi_execute_cmd(sdev, cmd, REQ_OP_DRV_IN, buffer, 5587dfe0b5eSMike Christie request_len, 30 * HZ, 3, &exec_args); 559ced202f7SHannes Reinecke if (result < 0) 560ced202f7SHannes Reinecke return result; 5613c6bdaeaSMartin K. Petersen if (result && scsi_sense_valid(&sshdr) && 5623c6bdaeaSMartin K. Petersen sshdr.sense_key == ILLEGAL_REQUEST && 5633c6bdaeaSMartin K. Petersen (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) 56466c28f97SMartin K. Petersen return -EINVAL; 5653c6bdaeaSMartin K. Petersen 5663c6bdaeaSMartin K. Petersen if ((buffer[1] & 3) == 3) /* Command supported */ 5673c6bdaeaSMartin K. Petersen return 1; 5683c6bdaeaSMartin K. Petersen 5693c6bdaeaSMartin K. Petersen return 0; 5703c6bdaeaSMartin K. Petersen } 5713c6bdaeaSMartin K. Petersen EXPORT_SYMBOL(scsi_report_opcode); 5723c6bdaeaSMartin K. Petersen 5733c6bdaeaSMartin K. Petersen /** 574eb44820cSRob Landley * scsi_device_get - get an additional reference to a scsi_device 5751da177e4SLinus Torvalds * @sdev: device to get a reference to 5761da177e4SLinus Torvalds * 577eb44820cSRob Landley * Description: Gets a reference to the scsi_device and increments the use count 5781da177e4SLinus Torvalds * of the underlying LLDD module. You must hold host_lock of the 5791da177e4SLinus Torvalds * parent Scsi_Host or already have a reference when calling this. 580cff549e4SChristoph Hellwig * 581cff549e4SChristoph Hellwig * This will fail if a device is deleted or cancelled, or when the LLD module 582cff549e4SChristoph Hellwig * is in the process of being unloaded. 5831da177e4SLinus Torvalds */ 5841da177e4SLinus Torvalds int scsi_device_get(struct scsi_device *sdev) 5851da177e4SLinus Torvalds { 586cff549e4SChristoph Hellwig if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL) 587cff549e4SChristoph Hellwig goto fail; 588cff549e4SChristoph Hellwig if (!try_module_get(sdev->host->hostt->module)) 589195fae20SBart Van Assche goto fail; 590195fae20SBart Van Assche if (!get_device(&sdev->sdev_gendev)) 591195fae20SBart Van Assche goto fail_put_module; 5921da177e4SLinus Torvalds return 0; 593cff549e4SChristoph Hellwig 594195fae20SBart Van Assche fail_put_module: 595195fae20SBart Van Assche module_put(sdev->host->hostt->module); 596cff549e4SChristoph Hellwig fail: 597cff549e4SChristoph Hellwig return -ENXIO; 5981da177e4SLinus Torvalds } 5991da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_get); 6001da177e4SLinus Torvalds 6011da177e4SLinus Torvalds /** 6021da177e4SLinus Torvalds * scsi_device_put - release a reference to a scsi_device 6031da177e4SLinus Torvalds * @sdev: device to release a reference on. 6041da177e4SLinus Torvalds * 605eb44820cSRob Landley * Description: Release a reference to the scsi_device and decrements the use 606eb44820cSRob Landley * count of the underlying LLDD module. The device is freed once the last 6071da177e4SLinus Torvalds * user vanishes. 6081da177e4SLinus Torvalds */ 6091da177e4SLinus Torvalds void scsi_device_put(struct scsi_device *sdev) 6101da177e4SLinus Torvalds { 61170e8d057SBart Van Assche struct module *mod = sdev->host->hostt->module; 61270e8d057SBart Van Assche 6131da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 61470e8d057SBart Van Assche module_put(mod); 6151da177e4SLinus Torvalds } 6161da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_put); 6171da177e4SLinus Torvalds 618eb44820cSRob Landley /* helper for shost_for_each_device, see that for documentation */ 6191da177e4SLinus Torvalds struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, 6201da177e4SLinus Torvalds struct scsi_device *prev) 6211da177e4SLinus Torvalds { 6221da177e4SLinus Torvalds struct list_head *list = (prev ? &prev->siblings : &shost->__devices); 6231da177e4SLinus Torvalds struct scsi_device *next = NULL; 6241da177e4SLinus Torvalds unsigned long flags; 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 6271da177e4SLinus Torvalds while (list->next != &shost->__devices) { 6281da177e4SLinus Torvalds next = list_entry(list->next, struct scsi_device, siblings); 6291da177e4SLinus Torvalds /* skip devices that we can't get a reference to */ 6301da177e4SLinus Torvalds if (!scsi_device_get(next)) 6311da177e4SLinus Torvalds break; 6321da177e4SLinus Torvalds next = NULL; 6331da177e4SLinus Torvalds list = list->next; 6341da177e4SLinus Torvalds } 6351da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvalds if (prev) 6381da177e4SLinus Torvalds scsi_device_put(prev); 6391da177e4SLinus Torvalds return next; 6401da177e4SLinus Torvalds } 6411da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_iterate_devices); 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvalds /** 6441da177e4SLinus Torvalds * starget_for_each_device - helper to walk all devices of a target 6451da177e4SLinus Torvalds * @starget: target whose devices we want to iterate over. 646eb44820cSRob Landley * @data: Opaque passed to each function call. 647eb44820cSRob Landley * @fn: Function to call on each device 6481da177e4SLinus Torvalds * 649522939d4SMaciej W. Rozycki * This traverses over each device of @starget. The devices have 6501da177e4SLinus Torvalds * a reference that must be released by scsi_host_put when breaking 6511da177e4SLinus Torvalds * out of the loop. 6521da177e4SLinus Torvalds */ 6531da177e4SLinus Torvalds void starget_for_each_device(struct scsi_target *starget, void *data, 6541da177e4SLinus Torvalds void (*fn)(struct scsi_device *, void *)) 6551da177e4SLinus Torvalds { 6561da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 6571da177e4SLinus Torvalds struct scsi_device *sdev; 6581da177e4SLinus Torvalds 6591da177e4SLinus Torvalds shost_for_each_device(sdev, shost) { 6601da177e4SLinus Torvalds if ((sdev->channel == starget->channel) && 6611da177e4SLinus Torvalds (sdev->id == starget->id)) 6621da177e4SLinus Torvalds fn(sdev, data); 6631da177e4SLinus Torvalds } 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds EXPORT_SYMBOL(starget_for_each_device); 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds /** 66814f501a4SRandy Dunlap * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) 669522939d4SMaciej W. Rozycki * @starget: target whose devices we want to iterate over. 67014f501a4SRandy Dunlap * @data: parameter for callback @fn() 67114f501a4SRandy Dunlap * @fn: callback function that is invoked for each device 672522939d4SMaciej W. Rozycki * 673522939d4SMaciej W. Rozycki * This traverses over each device of @starget. It does _not_ 674522939d4SMaciej W. Rozycki * take a reference on the scsi_device, so the whole loop must be 675522939d4SMaciej W. Rozycki * protected by shost->host_lock. 676522939d4SMaciej W. Rozycki * 677522939d4SMaciej W. Rozycki * Note: The only reason why drivers would want to use this is because 678522939d4SMaciej W. Rozycki * they need to access the device list in irq context. Otherwise you 679522939d4SMaciej W. Rozycki * really want to use starget_for_each_device instead. 680522939d4SMaciej W. Rozycki **/ 681522939d4SMaciej W. Rozycki void __starget_for_each_device(struct scsi_target *starget, void *data, 682522939d4SMaciej W. Rozycki void (*fn)(struct scsi_device *, void *)) 683522939d4SMaciej W. Rozycki { 684522939d4SMaciej W. Rozycki struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 685522939d4SMaciej W. Rozycki struct scsi_device *sdev; 686522939d4SMaciej W. Rozycki 687522939d4SMaciej W. Rozycki __shost_for_each_device(sdev, shost) { 688522939d4SMaciej W. Rozycki if ((sdev->channel == starget->channel) && 689522939d4SMaciej W. Rozycki (sdev->id == starget->id)) 690522939d4SMaciej W. Rozycki fn(sdev, data); 691522939d4SMaciej W. Rozycki } 692522939d4SMaciej W. Rozycki } 693522939d4SMaciej W. Rozycki EXPORT_SYMBOL(__starget_for_each_device); 694522939d4SMaciej W. Rozycki 695522939d4SMaciej W. Rozycki /** 6961da177e4SLinus Torvalds * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) 6971da177e4SLinus Torvalds * @starget: SCSI target pointer 6981da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 6991da177e4SLinus Torvalds * 700eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @lun for a given 7011da177e4SLinus Torvalds * @starget. The returned scsi_device does not have an additional 7021da177e4SLinus Torvalds * reference. You must hold the host's host_lock over this call and 70332aeef60SHannes Reinecke * any access to the returned scsi_device. A scsi_device in state 70432aeef60SHannes Reinecke * SDEV_DEL is skipped. 7051da177e4SLinus Torvalds * 706dc8875e1SRandy Dunlap * Note: The only reason why drivers should use this is because 707eb44820cSRob Landley * they need to access the device list in irq context. Otherwise you 7081da177e4SLinus Torvalds * really want to use scsi_device_lookup_by_target instead. 7091da177e4SLinus Torvalds **/ 7101da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, 7119cb78c16SHannes Reinecke u64 lun) 7121da177e4SLinus Torvalds { 7131da177e4SLinus Torvalds struct scsi_device *sdev; 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvalds list_for_each_entry(sdev, &starget->devices, same_target_siblings) { 71632aeef60SHannes Reinecke if (sdev->sdev_state == SDEV_DEL) 71732aeef60SHannes Reinecke continue; 7181da177e4SLinus Torvalds if (sdev->lun ==lun) 7191da177e4SLinus Torvalds return sdev; 7201da177e4SLinus Torvalds } 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds return NULL; 7231da177e4SLinus Torvalds } 7241da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup_by_target); 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvalds /** 7271da177e4SLinus Torvalds * scsi_device_lookup_by_target - find a device given the target 7281da177e4SLinus Torvalds * @starget: SCSI target pointer 7291da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7301da177e4SLinus Torvalds * 731477e608cSBartlomiej Zolnierkiewicz * Description: Looks up the scsi_device with the specified @lun for a given 732477e608cSBartlomiej Zolnierkiewicz * @starget. The returned scsi_device has an additional reference that 733eb44820cSRob Landley * needs to be released with scsi_device_put once you're done with it. 7341da177e4SLinus Torvalds **/ 7351da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, 7369cb78c16SHannes Reinecke u64 lun) 7371da177e4SLinus Torvalds { 7381da177e4SLinus Torvalds struct scsi_device *sdev; 7391da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 7401da177e4SLinus Torvalds unsigned long flags; 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 7431da177e4SLinus Torvalds sdev = __scsi_device_lookup_by_target(starget, lun); 7441da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 7451da177e4SLinus Torvalds sdev = NULL; 7461da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 7471da177e4SLinus Torvalds 7481da177e4SLinus Torvalds return sdev; 7491da177e4SLinus Torvalds } 7501da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup_by_target); 7511da177e4SLinus Torvalds 7521da177e4SLinus Torvalds /** 753eb44820cSRob Landley * __scsi_device_lookup - find a device given the host (UNLOCKED) 7541da177e4SLinus Torvalds * @shost: SCSI host pointer 7551da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 756eb44820cSRob Landley * @id: SCSI target number (physical unit number) 7571da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7581da177e4SLinus Torvalds * 759eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @channel, @id, @lun 760eb44820cSRob Landley * for a given host. The returned scsi_device does not have an additional 761eb44820cSRob Landley * reference. You must hold the host's host_lock over this call and any access 762eb44820cSRob Landley * to the returned scsi_device. 7631da177e4SLinus Torvalds * 7641da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 765eb44820cSRob Landley * they need to access the device list in irq context. Otherwise you 7661da177e4SLinus Torvalds * really want to use scsi_device_lookup instead. 7671da177e4SLinus Torvalds **/ 7681da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, 7699cb78c16SHannes Reinecke uint channel, uint id, u64 lun) 7701da177e4SLinus Torvalds { 7711da177e4SLinus Torvalds struct scsi_device *sdev; 7721da177e4SLinus Torvalds 7731da177e4SLinus Torvalds list_for_each_entry(sdev, &shost->__devices, siblings) { 7744ff7adc8SZhou Zhengping if (sdev->sdev_state == SDEV_DEL) 7754ff7adc8SZhou Zhengping continue; 7761da177e4SLinus Torvalds if (sdev->channel == channel && sdev->id == id && 7771da177e4SLinus Torvalds sdev->lun ==lun) 7781da177e4SLinus Torvalds return sdev; 7791da177e4SLinus Torvalds } 7801da177e4SLinus Torvalds 7811da177e4SLinus Torvalds return NULL; 7821da177e4SLinus Torvalds } 7831da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup); 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvalds /** 7861da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host 7871da177e4SLinus Torvalds * @shost: SCSI host pointer 7881da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 7891da177e4SLinus Torvalds * @id: SCSI target number (physical unit number) 7901da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 7911da177e4SLinus Torvalds * 792eb44820cSRob Landley * Description: Looks up the scsi_device with the specified @channel, @id, @lun 793eb44820cSRob Landley * for a given host. The returned scsi_device has an additional reference that 794eb44820cSRob Landley * needs to be released with scsi_device_put once you're done with it. 7951da177e4SLinus Torvalds **/ 7961da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, 7979cb78c16SHannes Reinecke uint channel, uint id, u64 lun) 7981da177e4SLinus Torvalds { 7991da177e4SLinus Torvalds struct scsi_device *sdev; 8001da177e4SLinus Torvalds unsigned long flags; 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 8031da177e4SLinus Torvalds sdev = __scsi_device_lookup(shost, channel, id, lun); 8041da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 8051da177e4SLinus Torvalds sdev = NULL; 8061da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 8071da177e4SLinus Torvalds 8081da177e4SLinus Torvalds return sdev; 8091da177e4SLinus Torvalds } 8101da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup); 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds MODULE_DESCRIPTION("SCSI core"); 8131da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvalds module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); 8161da177e4SLinus Torvalds MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds static int __init init_scsi(void) 8191da177e4SLinus Torvalds { 8209bf09c23SJens Axboe int error; 8211da177e4SLinus Torvalds 8221da177e4SLinus Torvalds error = scsi_init_procfs(); 8231da177e4SLinus Torvalds if (error) 8241da177e4SLinus Torvalds goto cleanup_queue; 8251da177e4SLinus Torvalds error = scsi_init_devinfo(); 8261da177e4SLinus Torvalds if (error) 8271da177e4SLinus Torvalds goto cleanup_procfs; 8281da177e4SLinus Torvalds error = scsi_init_hosts(); 8291da177e4SLinus Torvalds if (error) 8301da177e4SLinus Torvalds goto cleanup_devlist; 8311da177e4SLinus Torvalds error = scsi_init_sysctl(); 8321da177e4SLinus Torvalds if (error) 8331da177e4SLinus Torvalds goto cleanup_hosts; 8341da177e4SLinus Torvalds error = scsi_sysfs_register(); 8351da177e4SLinus Torvalds if (error) 8361da177e4SLinus Torvalds goto cleanup_sysctl; 8371da177e4SLinus Torvalds 83884314fd4SJames Smart scsi_netlink_init(); 83984314fd4SJames Smart 8401da177e4SLinus Torvalds printk(KERN_NOTICE "SCSI subsystem initialized\n"); 8411da177e4SLinus Torvalds return 0; 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvalds cleanup_sysctl: 8441da177e4SLinus Torvalds scsi_exit_sysctl(); 8451da177e4SLinus Torvalds cleanup_hosts: 8461da177e4SLinus Torvalds scsi_exit_hosts(); 8471da177e4SLinus Torvalds cleanup_devlist: 8481da177e4SLinus Torvalds scsi_exit_devinfo(); 8491da177e4SLinus Torvalds cleanup_procfs: 8501da177e4SLinus Torvalds scsi_exit_procfs(); 8511da177e4SLinus Torvalds cleanup_queue: 8521da177e4SLinus Torvalds scsi_exit_queue(); 8531da177e4SLinus Torvalds printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", 8541da177e4SLinus Torvalds -error); 8551da177e4SLinus Torvalds return error; 8561da177e4SLinus Torvalds } 8571da177e4SLinus Torvalds 8581da177e4SLinus Torvalds static void __exit exit_scsi(void) 8591da177e4SLinus Torvalds { 86084314fd4SJames Smart scsi_netlink_exit(); 8611da177e4SLinus Torvalds scsi_sysfs_unregister(); 8621da177e4SLinus Torvalds scsi_exit_sysctl(); 8631da177e4SLinus Torvalds scsi_exit_hosts(); 8641da177e4SLinus Torvalds scsi_exit_devinfo(); 8651da177e4SLinus Torvalds scsi_exit_procfs(); 8661da177e4SLinus Torvalds scsi_exit_queue(); 8671da177e4SLinus Torvalds } 8681da177e4SLinus Torvalds 8691da177e4SLinus Torvalds subsys_initcall(init_scsi); 8701da177e4SLinus Torvalds module_exit(exit_scsi); 871