11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * scsi.c Copyright (C) 1992 Drew Eckhardt 31da177e4SLinus Torvalds * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale 41da177e4SLinus Torvalds * Copyright (C) 2002, 2003 Christoph Hellwig 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * generic mid-level SCSI driver 71da177e4SLinus Torvalds * Initial versions: Drew Eckhardt 81da177e4SLinus Torvalds * Subsequent revisions: Eric Youngdale 91da177e4SLinus Torvalds * 101da177e4SLinus Torvalds * <drew@colorado.edu> 111da177e4SLinus Torvalds * 121da177e4SLinus Torvalds * Bug correction thanks go to : 131da177e4SLinus Torvalds * Rik Faith <faith@cs.unc.edu> 141da177e4SLinus Torvalds * Tommy Thorn <tthorn> 151da177e4SLinus Torvalds * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de> 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to 181da177e4SLinus Torvalds * add scatter-gather, multiple outstanding request, and other 191da177e4SLinus Torvalds * enhancements. 201da177e4SLinus Torvalds * 211da177e4SLinus Torvalds * Native multichannel, wide scsi, /proc/scsi and hot plugging 221da177e4SLinus Torvalds * support added by Michael Neuffer <mike@i-connect.net> 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * Added request_module("scsi_hostadapter") for kerneld: 251da177e4SLinus Torvalds * (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf) 261da177e4SLinus Torvalds * Bjorn Ekwall <bj0rn@blox.se> 271da177e4SLinus Torvalds * (changed to kmod) 281da177e4SLinus Torvalds * 291da177e4SLinus Torvalds * Major improvements to the timeout, abort, and reset processing, 301da177e4SLinus Torvalds * as well as performance modifications for large queue depths by 311da177e4SLinus Torvalds * Leonard N. Zubkoff <lnz@dandelion.com> 321da177e4SLinus Torvalds * 331da177e4SLinus Torvalds * Converted cli() code to spinlocks, Ingo Molnar 341da177e4SLinus Torvalds * 351da177e4SLinus Torvalds * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli 361da177e4SLinus Torvalds * 371da177e4SLinus Torvalds * out_of_space hacks, D. Gilbert (dpg) 990608 381da177e4SLinus Torvalds */ 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds #include <linux/module.h> 411da177e4SLinus Torvalds #include <linux/moduleparam.h> 421da177e4SLinus Torvalds #include <linux/kernel.h> 431da177e4SLinus Torvalds #include <linux/sched.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> 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds #include <scsi/scsi.h> 601da177e4SLinus Torvalds #include <scsi/scsi_cmnd.h> 611da177e4SLinus Torvalds #include <scsi/scsi_dbg.h> 621da177e4SLinus Torvalds #include <scsi/scsi_device.h> 631da177e4SLinus Torvalds #include <scsi/scsi_eh.h> 641da177e4SLinus Torvalds #include <scsi/scsi_host.h> 651da177e4SLinus Torvalds #include <scsi/scsi_tcq.h> 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds #include "scsi_priv.h" 681da177e4SLinus Torvalds #include "scsi_logging.h" 691da177e4SLinus Torvalds 7052c1da39SAdrian Bunk static void scsi_done(struct scsi_cmnd *cmd); 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds /* 731da177e4SLinus Torvalds * Definitions and constants. 741da177e4SLinus Torvalds */ 751da177e4SLinus Torvalds 761da177e4SLinus Torvalds #define MIN_RESET_DELAY (2*HZ) 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /* Do not call reset on error if we just did a reset within 15 sec. */ 791da177e4SLinus Torvalds #define MIN_RESET_PERIOD (15*HZ) 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* 821da177e4SLinus Torvalds * Macro to determine the size of SCSI command. This macro takes vendor 831da177e4SLinus Torvalds * unique commands into account. SCSI commands in groups 6 and 7 are 841da177e4SLinus Torvalds * vendor unique and we will depend upon the command length being 851da177e4SLinus Torvalds * supplied correctly in cmd_len. 861da177e4SLinus Torvalds */ 871da177e4SLinus Torvalds #define CDB_SIZE(cmd) (((((cmd)->cmnd[0] >> 5) & 7) < 6) ? \ 881da177e4SLinus Torvalds COMMAND_SIZE((cmd)->cmnd[0]) : (cmd)->cmd_len) 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds /* 911da177e4SLinus Torvalds * Note - the initial logging level can be set here to log events at boot time. 921da177e4SLinus Torvalds * After the system is up, you may enable logging via the /proc interface. 931da177e4SLinus Torvalds */ 941da177e4SLinus Torvalds unsigned int scsi_logging_level; 951da177e4SLinus Torvalds #if defined(CONFIG_SCSI_LOGGING) 961da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_logging_level); 971da177e4SLinus Torvalds #endif 981da177e4SLinus Torvalds 998a1cdc9cSMatthew Wilcox /* NB: These are exposed through /proc/scsi/scsi and form part of the ABI. 1008a1cdc9cSMatthew Wilcox * You may not alter any existing entry (although adding new ones is 1018a1cdc9cSMatthew Wilcox * encouraged once assigned by ANSI/INCITS T10 1028a1cdc9cSMatthew Wilcox */ 1034ff36718SMatthew Wilcox static const char *const scsi_device_types[] = { 1048a1cdc9cSMatthew Wilcox "Direct-Access ", 1058a1cdc9cSMatthew Wilcox "Sequential-Access", 1061da177e4SLinus Torvalds "Printer ", 1071da177e4SLinus Torvalds "Processor ", 1081da177e4SLinus Torvalds "WORM ", 1098a1cdc9cSMatthew Wilcox "CD-ROM ", 1101da177e4SLinus Torvalds "Scanner ", 1118a1cdc9cSMatthew Wilcox "Optical Device ", 1128a1cdc9cSMatthew Wilcox "Medium Changer ", 1131da177e4SLinus Torvalds "Communications ", 1144ff36718SMatthew Wilcox "ASC IT8 ", 1154ff36718SMatthew Wilcox "ASC IT8 ", 1161da177e4SLinus Torvalds "RAID ", 1171da177e4SLinus Torvalds "Enclosure ", 1188a1cdc9cSMatthew Wilcox "Direct-Access-RBC", 1194ff36718SMatthew Wilcox "Optical card ", 1204ff36718SMatthew Wilcox "Bridge controller", 1214ff36718SMatthew Wilcox "Object storage ", 1224ff36718SMatthew Wilcox "Automation/Drive ", 1231da177e4SLinus Torvalds }; 1244ff36718SMatthew Wilcox 1254ff36718SMatthew Wilcox const char * scsi_device_type(unsigned type) 1264ff36718SMatthew Wilcox { 1274ff36718SMatthew Wilcox if (type == 0x1e) 1284ff36718SMatthew Wilcox return "Well-known LUN "; 1294ff36718SMatthew Wilcox if (type == 0x1f) 1304ff36718SMatthew Wilcox return "No Device "; 1314ff36718SMatthew Wilcox if (type > ARRAY_SIZE(scsi_device_types)) 1324ff36718SMatthew Wilcox return "Unknown "; 1334ff36718SMatthew Wilcox return scsi_device_types[type]; 1344ff36718SMatthew Wilcox } 1354ff36718SMatthew Wilcox 1364ff36718SMatthew Wilcox EXPORT_SYMBOL(scsi_device_type); 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds struct scsi_host_cmd_pool { 1391da177e4SLinus Torvalds kmem_cache_t *slab; 1401da177e4SLinus Torvalds unsigned int users; 1411da177e4SLinus Torvalds char *name; 1421da177e4SLinus Torvalds unsigned int slab_flags; 143c53033f6SAl Viro gfp_t gfp_mask; 1441da177e4SLinus Torvalds }; 1451da177e4SLinus Torvalds 1461da177e4SLinus Torvalds static struct scsi_host_cmd_pool scsi_cmd_pool = { 1471da177e4SLinus Torvalds .name = "scsi_cmd_cache", 1481da177e4SLinus Torvalds .slab_flags = SLAB_HWCACHE_ALIGN, 1491da177e4SLinus Torvalds }; 1501da177e4SLinus Torvalds 1511da177e4SLinus Torvalds static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { 1521da177e4SLinus Torvalds .name = "scsi_cmd_cache(DMA)", 1531da177e4SLinus Torvalds .slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, 1541da177e4SLinus Torvalds .gfp_mask = __GFP_DMA, 1551da177e4SLinus Torvalds }; 1561da177e4SLinus Torvalds 1570b950672SArjan van de Ven static DEFINE_MUTEX(host_cmd_pool_mutex); 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, 160c53033f6SAl Viro gfp_t gfp_mask) 1611da177e4SLinus Torvalds { 1621da177e4SLinus Torvalds struct scsi_cmnd *cmd; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds cmd = kmem_cache_alloc(shost->cmd_pool->slab, 1651da177e4SLinus Torvalds gfp_mask | shost->cmd_pool->gfp_mask); 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds if (unlikely(!cmd)) { 1681da177e4SLinus Torvalds unsigned long flags; 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvalds spin_lock_irqsave(&shost->free_list_lock, flags); 1711da177e4SLinus Torvalds if (likely(!list_empty(&shost->free_list))) { 1721da177e4SLinus Torvalds cmd = list_entry(shost->free_list.next, 1731da177e4SLinus Torvalds struct scsi_cmnd, list); 1741da177e4SLinus Torvalds list_del_init(&cmd->list); 1751da177e4SLinus Torvalds } 1761da177e4SLinus Torvalds spin_unlock_irqrestore(&shost->free_list_lock, flags); 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds return cmd; 1801da177e4SLinus Torvalds } 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds /* 1831da177e4SLinus Torvalds * Function: scsi_get_command() 1841da177e4SLinus Torvalds * 1851da177e4SLinus Torvalds * Purpose: Allocate and setup a scsi command block 1861da177e4SLinus Torvalds * 1871da177e4SLinus Torvalds * Arguments: dev - parent scsi device 1881da177e4SLinus Torvalds * gfp_mask- allocator flags 1891da177e4SLinus Torvalds * 1901da177e4SLinus Torvalds * Returns: The allocated scsi command structure. 1911da177e4SLinus Torvalds */ 192c53033f6SAl Viro struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) 1931da177e4SLinus Torvalds { 1941da177e4SLinus Torvalds struct scsi_cmnd *cmd; 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds /* Bail if we can't get a reference to the device */ 1971da177e4SLinus Torvalds if (!get_device(&dev->sdev_gendev)) 1981da177e4SLinus Torvalds return NULL; 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds cmd = __scsi_get_command(dev->host, gfp_mask); 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvalds if (likely(cmd != NULL)) { 2031da177e4SLinus Torvalds unsigned long flags; 2041da177e4SLinus Torvalds 2051da177e4SLinus Torvalds memset(cmd, 0, sizeof(*cmd)); 2061da177e4SLinus Torvalds cmd->device = dev; 2071da177e4SLinus Torvalds init_timer(&cmd->eh_timeout); 2081da177e4SLinus Torvalds INIT_LIST_HEAD(&cmd->list); 2091da177e4SLinus Torvalds spin_lock_irqsave(&dev->list_lock, flags); 2101da177e4SLinus Torvalds list_add_tail(&cmd->list, &dev->cmd_list); 2111da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->list_lock, flags); 21279e448bfSMatthew Dobson cmd->jiffies_at_alloc = jiffies; 2131da177e4SLinus Torvalds } else 2141da177e4SLinus Torvalds put_device(&dev->sdev_gendev); 2151da177e4SLinus Torvalds 2161da177e4SLinus Torvalds return cmd; 2171da177e4SLinus Torvalds } 2181da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_get_command); 2191da177e4SLinus Torvalds 2201da177e4SLinus Torvalds /* 2211da177e4SLinus Torvalds * Function: scsi_put_command() 2221da177e4SLinus Torvalds * 2231da177e4SLinus Torvalds * Purpose: Free a scsi command block 2241da177e4SLinus Torvalds * 2251da177e4SLinus Torvalds * Arguments: cmd - command block to free 2261da177e4SLinus Torvalds * 2271da177e4SLinus Torvalds * Returns: Nothing. 2281da177e4SLinus Torvalds * 2291da177e4SLinus Torvalds * Notes: The command must not belong to any lists. 2301da177e4SLinus Torvalds */ 2311da177e4SLinus Torvalds void scsi_put_command(struct scsi_cmnd *cmd) 2321da177e4SLinus Torvalds { 2331da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 2341da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 2351da177e4SLinus Torvalds unsigned long flags; 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* serious error if the command hasn't come from a device list */ 2381da177e4SLinus Torvalds spin_lock_irqsave(&cmd->device->list_lock, flags); 2391da177e4SLinus Torvalds BUG_ON(list_empty(&cmd->list)); 2401da177e4SLinus Torvalds list_del_init(&cmd->list); 2411da177e4SLinus Torvalds spin_unlock(&cmd->device->list_lock); 2421da177e4SLinus Torvalds /* changing locks here, don't need to restore the irq state */ 2431da177e4SLinus Torvalds spin_lock(&shost->free_list_lock); 2441da177e4SLinus Torvalds if (unlikely(list_empty(&shost->free_list))) { 2451da177e4SLinus Torvalds list_add(&cmd->list, &shost->free_list); 2461da177e4SLinus Torvalds cmd = NULL; 2471da177e4SLinus Torvalds } 2481da177e4SLinus Torvalds spin_unlock_irqrestore(&shost->free_list_lock, flags); 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds if (likely(cmd != NULL)) 2511da177e4SLinus Torvalds kmem_cache_free(shost->cmd_pool->slab, cmd); 2521da177e4SLinus Torvalds 2531da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 2541da177e4SLinus Torvalds } 2551da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_put_command); 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds /* 2581da177e4SLinus Torvalds * Function: scsi_setup_command_freelist() 2591da177e4SLinus Torvalds * 2601da177e4SLinus Torvalds * Purpose: Setup the command freelist for a scsi host. 2611da177e4SLinus Torvalds * 2621da177e4SLinus Torvalds * Arguments: shost - host to allocate the freelist for. 2631da177e4SLinus Torvalds * 2641da177e4SLinus Torvalds * Returns: Nothing. 2651da177e4SLinus Torvalds */ 2661da177e4SLinus Torvalds int scsi_setup_command_freelist(struct Scsi_Host *shost) 2671da177e4SLinus Torvalds { 2681da177e4SLinus Torvalds struct scsi_host_cmd_pool *pool; 2691da177e4SLinus Torvalds struct scsi_cmnd *cmd; 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds spin_lock_init(&shost->free_list_lock); 2721da177e4SLinus Torvalds INIT_LIST_HEAD(&shost->free_list); 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvalds /* 2751da177e4SLinus Torvalds * Select a command slab for this host and create it if not 2761da177e4SLinus Torvalds * yet existant. 2771da177e4SLinus Torvalds */ 2780b950672SArjan van de Ven mutex_lock(&host_cmd_pool_mutex); 2791da177e4SLinus Torvalds pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool); 2801da177e4SLinus Torvalds if (!pool->users) { 2811da177e4SLinus Torvalds pool->slab = kmem_cache_create(pool->name, 2821da177e4SLinus Torvalds sizeof(struct scsi_cmnd), 0, 2831da177e4SLinus Torvalds pool->slab_flags, NULL, NULL); 2841da177e4SLinus Torvalds if (!pool->slab) 2851da177e4SLinus Torvalds goto fail; 2861da177e4SLinus Torvalds } 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvalds pool->users++; 2891da177e4SLinus Torvalds shost->cmd_pool = pool; 2900b950672SArjan van de Ven mutex_unlock(&host_cmd_pool_mutex); 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /* 2931da177e4SLinus Torvalds * Get one backup command for this host. 2941da177e4SLinus Torvalds */ 2951da177e4SLinus Torvalds cmd = kmem_cache_alloc(shost->cmd_pool->slab, 2961da177e4SLinus Torvalds GFP_KERNEL | shost->cmd_pool->gfp_mask); 2971da177e4SLinus Torvalds if (!cmd) 2981da177e4SLinus Torvalds goto fail2; 2991da177e4SLinus Torvalds list_add(&cmd->list, &shost->free_list); 3001da177e4SLinus Torvalds return 0; 3011da177e4SLinus Torvalds 3021da177e4SLinus Torvalds fail2: 3031da177e4SLinus Torvalds if (!--pool->users) 3041da177e4SLinus Torvalds kmem_cache_destroy(pool->slab); 3051da177e4SLinus Torvalds return -ENOMEM; 3061da177e4SLinus Torvalds fail: 3070b950672SArjan van de Ven mutex_unlock(&host_cmd_pool_mutex); 3081da177e4SLinus Torvalds return -ENOMEM; 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvalds } 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds /* 3131da177e4SLinus Torvalds * Function: scsi_destroy_command_freelist() 3141da177e4SLinus Torvalds * 3151da177e4SLinus Torvalds * Purpose: Release the command freelist for a scsi host. 3161da177e4SLinus Torvalds * 3171da177e4SLinus Torvalds * Arguments: shost - host that's freelist is going to be destroyed 3181da177e4SLinus Torvalds */ 3191da177e4SLinus Torvalds void scsi_destroy_command_freelist(struct Scsi_Host *shost) 3201da177e4SLinus Torvalds { 3211da177e4SLinus Torvalds while (!list_empty(&shost->free_list)) { 3221da177e4SLinus Torvalds struct scsi_cmnd *cmd; 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvalds cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); 3251da177e4SLinus Torvalds list_del_init(&cmd->list); 3261da177e4SLinus Torvalds kmem_cache_free(shost->cmd_pool->slab, cmd); 3271da177e4SLinus Torvalds } 3281da177e4SLinus Torvalds 3290b950672SArjan van de Ven mutex_lock(&host_cmd_pool_mutex); 3301da177e4SLinus Torvalds if (!--shost->cmd_pool->users) 3311da177e4SLinus Torvalds kmem_cache_destroy(shost->cmd_pool->slab); 3320b950672SArjan van de Ven mutex_unlock(&host_cmd_pool_mutex); 3331da177e4SLinus Torvalds } 3341da177e4SLinus Torvalds 3351da177e4SLinus Torvalds #ifdef CONFIG_SCSI_LOGGING 3361da177e4SLinus Torvalds void scsi_log_send(struct scsi_cmnd *cmd) 3371da177e4SLinus Torvalds { 3381da177e4SLinus Torvalds unsigned int level; 3391da177e4SLinus Torvalds struct scsi_device *sdev; 3401da177e4SLinus Torvalds 3411da177e4SLinus Torvalds /* 3421da177e4SLinus Torvalds * If ML QUEUE log level is greater than or equal to: 3431da177e4SLinus Torvalds * 3441da177e4SLinus Torvalds * 1: nothing (match completion) 3451da177e4SLinus Torvalds * 3461da177e4SLinus Torvalds * 2: log opcode + command of all commands 3471da177e4SLinus Torvalds * 3481da177e4SLinus Torvalds * 3: same as 2 plus dump cmd address 3491da177e4SLinus Torvalds * 3501da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 3511da177e4SLinus Torvalds */ 3521da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 3531da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, 3541da177e4SLinus Torvalds SCSI_LOG_MLQUEUE_BITS); 3551da177e4SLinus Torvalds if (level > 1) { 3561da177e4SLinus Torvalds sdev = cmd->device; 3579ccfc756SJames Bottomley sdev_printk(KERN_INFO, sdev, "send "); 3581da177e4SLinus Torvalds if (level > 2) 3591da177e4SLinus Torvalds printk("0x%p ", cmd); 3601da177e4SLinus Torvalds /* 3611da177e4SLinus Torvalds * spaces to match disposition and cmd->result 3621da177e4SLinus Torvalds * output in scsi_log_completion. 3631da177e4SLinus Torvalds */ 3641da177e4SLinus Torvalds printk(" "); 3651da177e4SLinus Torvalds scsi_print_command(cmd); 3661da177e4SLinus Torvalds if (level > 3) { 3671da177e4SLinus Torvalds printk(KERN_INFO "buffer = 0x%p, bufflen = %d," 3681da177e4SLinus Torvalds " done = 0x%p, queuecommand 0x%p\n", 369631c228cSChristoph Hellwig cmd->request_buffer, cmd->request_bufflen, 3701da177e4SLinus Torvalds cmd->done, 3711da177e4SLinus Torvalds sdev->host->hostt->queuecommand); 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds } 3751da177e4SLinus Torvalds } 3761da177e4SLinus Torvalds } 3771da177e4SLinus Torvalds 3781da177e4SLinus Torvalds void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) 3791da177e4SLinus Torvalds { 3801da177e4SLinus Torvalds unsigned int level; 3811da177e4SLinus Torvalds struct scsi_device *sdev; 3821da177e4SLinus Torvalds 3831da177e4SLinus Torvalds /* 3841da177e4SLinus Torvalds * If ML COMPLETE log level is greater than or equal to: 3851da177e4SLinus Torvalds * 3861da177e4SLinus Torvalds * 1: log disposition, result, opcode + command, and conditionally 3871da177e4SLinus Torvalds * sense data for failures or non SUCCESS dispositions. 3881da177e4SLinus Torvalds * 3891da177e4SLinus Torvalds * 2: same as 1 but for all command completions. 3901da177e4SLinus Torvalds * 3911da177e4SLinus Torvalds * 3: same as 2 plus dump cmd address 3921da177e4SLinus Torvalds * 3931da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 3941da177e4SLinus Torvalds */ 3951da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 3961da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, 3971da177e4SLinus Torvalds SCSI_LOG_MLCOMPLETE_BITS); 3981da177e4SLinus Torvalds if (((level > 0) && (cmd->result || disposition != SUCCESS)) || 3991da177e4SLinus Torvalds (level > 1)) { 4001da177e4SLinus Torvalds sdev = cmd->device; 4019ccfc756SJames Bottomley sdev_printk(KERN_INFO, sdev, "done "); 4021da177e4SLinus Torvalds if (level > 2) 4031da177e4SLinus Torvalds printk("0x%p ", cmd); 4041da177e4SLinus Torvalds /* 4051da177e4SLinus Torvalds * Dump truncated values, so we usually fit within 4061da177e4SLinus Torvalds * 80 chars. 4071da177e4SLinus Torvalds */ 4081da177e4SLinus Torvalds switch (disposition) { 4091da177e4SLinus Torvalds case SUCCESS: 4101da177e4SLinus Torvalds printk("SUCCESS"); 4111da177e4SLinus Torvalds break; 4121da177e4SLinus Torvalds case NEEDS_RETRY: 4131da177e4SLinus Torvalds printk("RETRY "); 4141da177e4SLinus Torvalds break; 4151da177e4SLinus Torvalds case ADD_TO_MLQUEUE: 4161da177e4SLinus Torvalds printk("MLQUEUE"); 4171da177e4SLinus Torvalds break; 4181da177e4SLinus Torvalds case FAILED: 4191da177e4SLinus Torvalds printk("FAILED "); 4201da177e4SLinus Torvalds break; 4211da177e4SLinus Torvalds case TIMEOUT_ERROR: 4221da177e4SLinus Torvalds /* 4231da177e4SLinus Torvalds * If called via scsi_times_out. 4241da177e4SLinus Torvalds */ 4251da177e4SLinus Torvalds printk("TIMEOUT"); 4261da177e4SLinus Torvalds break; 4271da177e4SLinus Torvalds default: 4281da177e4SLinus Torvalds printk("UNKNOWN"); 4291da177e4SLinus Torvalds } 4301da177e4SLinus Torvalds printk(" %8x ", cmd->result); 4311da177e4SLinus Torvalds scsi_print_command(cmd); 4321da177e4SLinus Torvalds if (status_byte(cmd->result) & CHECK_CONDITION) { 4331da177e4SLinus Torvalds /* 434db9dff36S * XXX The scsi_print_sense formatting/prefix 4351da177e4SLinus Torvalds * doesn't match this function. 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds scsi_print_sense("", cmd); 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds if (level > 3) { 4401da177e4SLinus Torvalds printk(KERN_INFO "scsi host busy %d failed %d\n", 4411da177e4SLinus Torvalds sdev->host->host_busy, 4421da177e4SLinus Torvalds sdev->host->host_failed); 4431da177e4SLinus Torvalds } 4441da177e4SLinus Torvalds } 4451da177e4SLinus Torvalds } 4461da177e4SLinus Torvalds } 4471da177e4SLinus Torvalds #endif 4481da177e4SLinus Torvalds 4491da177e4SLinus Torvalds /* 4501da177e4SLinus Torvalds * Assign a serial number and pid to the request for error recovery 4511da177e4SLinus Torvalds * and debugging purposes. Protected by the Host_Lock of host. 4521da177e4SLinus Torvalds */ 4531da177e4SLinus Torvalds static inline void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) 4541da177e4SLinus Torvalds { 4551da177e4SLinus Torvalds cmd->serial_number = host->cmd_serial_number++; 4561da177e4SLinus Torvalds if (cmd->serial_number == 0) 4571da177e4SLinus Torvalds cmd->serial_number = host->cmd_serial_number++; 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds cmd->pid = host->cmd_pid++; 4601da177e4SLinus Torvalds if (cmd->pid == 0) 4611da177e4SLinus Torvalds cmd->pid = host->cmd_pid++; 4621da177e4SLinus Torvalds } 4631da177e4SLinus Torvalds 4641da177e4SLinus Torvalds /* 4651da177e4SLinus Torvalds * Function: scsi_dispatch_command 4661da177e4SLinus Torvalds * 4671da177e4SLinus Torvalds * Purpose: Dispatch a command to the low-level driver. 4681da177e4SLinus Torvalds * 4691da177e4SLinus Torvalds * Arguments: cmd - command block we are dispatching. 4701da177e4SLinus Torvalds * 4711da177e4SLinus Torvalds * Notes: 4721da177e4SLinus Torvalds */ 4731da177e4SLinus Torvalds int scsi_dispatch_cmd(struct scsi_cmnd *cmd) 4741da177e4SLinus Torvalds { 4751da177e4SLinus Torvalds struct Scsi_Host *host = cmd->device->host; 4761da177e4SLinus Torvalds unsigned long flags = 0; 4771da177e4SLinus Torvalds unsigned long timeout; 4781da177e4SLinus Torvalds int rtn = 0; 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds /* check if the device is still usable */ 4811da177e4SLinus Torvalds if (unlikely(cmd->device->sdev_state == SDEV_DEL)) { 4821da177e4SLinus Torvalds /* in SDEV_DEL we error all commands. DID_NO_CONNECT 4831da177e4SLinus Torvalds * returns an immediate error upwards, and signals 4841da177e4SLinus Torvalds * that the device is no longer present */ 4851da177e4SLinus Torvalds cmd->result = DID_NO_CONNECT << 16; 4861da177e4SLinus Torvalds atomic_inc(&cmd->device->iorequest_cnt); 48769b52893SMike Christie __scsi_done(cmd); 4881da177e4SLinus Torvalds /* return 0 (because the command has been processed) */ 4891da177e4SLinus Torvalds goto out; 4901da177e4SLinus Torvalds } 4911da177e4SLinus Torvalds 4921da177e4SLinus Torvalds /* Check to see if the scsi lld put this device into state SDEV_BLOCK. */ 4931da177e4SLinus Torvalds if (unlikely(cmd->device->sdev_state == SDEV_BLOCK)) { 4941da177e4SLinus Torvalds /* 4951da177e4SLinus Torvalds * in SDEV_BLOCK, the command is just put back on the device 4961da177e4SLinus Torvalds * queue. The suspend state has already blocked the queue so 4971da177e4SLinus Torvalds * future requests should not occur until the device 4981da177e4SLinus Torvalds * transitions out of the suspend state. 4991da177e4SLinus Torvalds */ 5001da177e4SLinus Torvalds scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); 5011da177e4SLinus Torvalds 5021da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, printk("queuecommand : device blocked \n")); 5031da177e4SLinus Torvalds 5041da177e4SLinus Torvalds /* 5051da177e4SLinus Torvalds * NOTE: rtn is still zero here because we don't need the 5061da177e4SLinus Torvalds * queue to be plugged on return (it's already stopped) 5071da177e4SLinus Torvalds */ 5081da177e4SLinus Torvalds goto out; 5091da177e4SLinus Torvalds } 5101da177e4SLinus Torvalds 5111da177e4SLinus Torvalds /* 5121da177e4SLinus Torvalds * If SCSI-2 or lower, store the LUN value in cmnd. 5131da177e4SLinus Torvalds */ 5144d7db04aSJames Bottomley if (cmd->device->scsi_level <= SCSI_2 && 5154d7db04aSJames Bottomley cmd->device->scsi_level != SCSI_UNKNOWN) { 5161da177e4SLinus Torvalds cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) | 5171da177e4SLinus Torvalds (cmd->device->lun << 5 & 0xe0); 5181da177e4SLinus Torvalds } 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvalds /* 5211da177e4SLinus Torvalds * We will wait MIN_RESET_DELAY clock ticks after the last reset so 5221da177e4SLinus Torvalds * we can avoid the drive not being ready. 5231da177e4SLinus Torvalds */ 5241da177e4SLinus Torvalds timeout = host->last_reset + MIN_RESET_DELAY; 5251da177e4SLinus Torvalds 5261da177e4SLinus Torvalds if (host->resetting && time_before(jiffies, timeout)) { 5271da177e4SLinus Torvalds int ticks_remaining = timeout - jiffies; 5281da177e4SLinus Torvalds /* 5291da177e4SLinus Torvalds * NOTE: This may be executed from within an interrupt 5301da177e4SLinus Torvalds * handler! This is bad, but for now, it'll do. The irq 5311da177e4SLinus Torvalds * level of the interrupt handler has been masked out by the 5321da177e4SLinus Torvalds * platform dependent interrupt handling code already, so the 5331da177e4SLinus Torvalds * sti() here will not cause another call to the SCSI host's 5341da177e4SLinus Torvalds * interrupt handler (assuming there is one irq-level per 5351da177e4SLinus Torvalds * host). 5361da177e4SLinus Torvalds */ 5371da177e4SLinus Torvalds while (--ticks_remaining >= 0) 5381da177e4SLinus Torvalds mdelay(1 + 999 / HZ); 5391da177e4SLinus Torvalds host->resetting = 0; 5401da177e4SLinus Torvalds } 5411da177e4SLinus Torvalds 5421da177e4SLinus Torvalds /* 5431da177e4SLinus Torvalds * AK: unlikely race here: for some reason the timer could 5441da177e4SLinus Torvalds * expire before the serial number is set up below. 5451da177e4SLinus Torvalds */ 5461da177e4SLinus Torvalds scsi_add_timer(cmd, cmd->timeout_per_command, scsi_times_out); 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds scsi_log_send(cmd); 5491da177e4SLinus Torvalds 5501da177e4SLinus Torvalds /* 5511da177e4SLinus Torvalds * We will use a queued command if possible, otherwise we will 5521da177e4SLinus Torvalds * emulate the queuing and calling of completion function ourselves. 5531da177e4SLinus Torvalds */ 5541da177e4SLinus Torvalds atomic_inc(&cmd->device->iorequest_cnt); 5551da177e4SLinus Torvalds 5561da177e4SLinus Torvalds /* 5571da177e4SLinus Torvalds * Before we queue this command, check if the command 5581da177e4SLinus Torvalds * length exceeds what the host adapter can handle. 5591da177e4SLinus Torvalds */ 5601da177e4SLinus Torvalds if (CDB_SIZE(cmd) > cmd->device->host->max_cmd_len) { 5611da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, 5621da177e4SLinus Torvalds printk("queuecommand : command too long.\n")); 5631da177e4SLinus Torvalds cmd->result = (DID_ABORT << 16); 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds scsi_done(cmd); 5661da177e4SLinus Torvalds goto out; 5671da177e4SLinus Torvalds } 5681da177e4SLinus Torvalds 5691da177e4SLinus Torvalds spin_lock_irqsave(host->host_lock, flags); 5701da177e4SLinus Torvalds scsi_cmd_get_serial(host, cmd); 5711da177e4SLinus Torvalds 572d2c9d9eaSMike Anderson if (unlikely(host->shost_state == SHOST_DEL)) { 5731da177e4SLinus Torvalds cmd->result = (DID_NO_CONNECT << 16); 5741da177e4SLinus Torvalds scsi_done(cmd); 5751da177e4SLinus Torvalds } else { 5761da177e4SLinus Torvalds rtn = host->hostt->queuecommand(cmd, scsi_done); 5771da177e4SLinus Torvalds } 5781da177e4SLinus Torvalds spin_unlock_irqrestore(host->host_lock, flags); 5791da177e4SLinus Torvalds if (rtn) { 580d8c37e7bSTejun Heo if (scsi_delete_timer(cmd)) { 5811da177e4SLinus Torvalds atomic_inc(&cmd->device->iodone_cnt); 5821da177e4SLinus Torvalds scsi_queue_insert(cmd, 5831da177e4SLinus Torvalds (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ? 5841da177e4SLinus Torvalds rtn : SCSI_MLQUEUE_HOST_BUSY); 585d8c37e7bSTejun Heo } 5861da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, 5871da177e4SLinus Torvalds printk("queuecommand : request rejected\n")); 5881da177e4SLinus Torvalds } 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvalds out: 5911da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, printk("leaving scsi_dispatch_cmnd()\n")); 5921da177e4SLinus Torvalds return rtn; 5931da177e4SLinus Torvalds } 5941da177e4SLinus Torvalds 5951da177e4SLinus Torvalds /** 59689f48c4dSLuben Tuikov * scsi_req_abort_cmd -- Request command recovery for the specified command 59789f48c4dSLuben Tuikov * cmd: pointer to the SCSI command of interest 59889f48c4dSLuben Tuikov * 59989f48c4dSLuben Tuikov * This function requests that SCSI Core start recovery for the 60089f48c4dSLuben Tuikov * command by deleting the timer and adding the command to the eh 60189f48c4dSLuben Tuikov * queue. It can be called by either LLDDs or SCSI Core. LLDDs who 60289f48c4dSLuben Tuikov * implement their own error recovery MAY ignore the timeout event if 60389f48c4dSLuben Tuikov * they generated scsi_req_abort_cmd. 60489f48c4dSLuben Tuikov */ 60589f48c4dSLuben Tuikov void scsi_req_abort_cmd(struct scsi_cmnd *cmd) 60689f48c4dSLuben Tuikov { 60789f48c4dSLuben Tuikov if (!scsi_delete_timer(cmd)) 60889f48c4dSLuben Tuikov return; 60989f48c4dSLuben Tuikov scsi_times_out(cmd); 61089f48c4dSLuben Tuikov } 61189f48c4dSLuben Tuikov EXPORT_SYMBOL(scsi_req_abort_cmd); 61289f48c4dSLuben Tuikov 61389f48c4dSLuben Tuikov /** 6141da177e4SLinus Torvalds * scsi_done - Enqueue the finished SCSI command into the done queue. 6151da177e4SLinus Torvalds * @cmd: The SCSI Command for which a low-level device driver (LLDD) gives 6161da177e4SLinus Torvalds * ownership back to SCSI Core -- i.e. the LLDD has finished with it. 6171da177e4SLinus Torvalds * 6181da177e4SLinus Torvalds * This function is the mid-level's (SCSI Core) interrupt routine, which 6191da177e4SLinus Torvalds * regains ownership of the SCSI command (de facto) from a LLDD, and enqueues 6201da177e4SLinus Torvalds * the command to the done queue for further processing. 6211da177e4SLinus Torvalds * 6221da177e4SLinus Torvalds * This is the producer of the done queue who enqueues at the tail. 6231da177e4SLinus Torvalds * 6241da177e4SLinus Torvalds * This function is interrupt context safe. 6251da177e4SLinus Torvalds */ 62652c1da39SAdrian Bunk static void scsi_done(struct scsi_cmnd *cmd) 6271da177e4SLinus Torvalds { 6281da177e4SLinus Torvalds /* 6291da177e4SLinus Torvalds * We don't have to worry about this one timing out any more. 6301da177e4SLinus Torvalds * If we are unable to remove the timer, then the command 6311da177e4SLinus Torvalds * has already timed out. In which case, we have no choice but to 6321da177e4SLinus Torvalds * let the timeout function run, as we have no idea where in fact 6331da177e4SLinus Torvalds * that function could really be. It might be on another processor, 6341da177e4SLinus Torvalds * etc, etc. 6351da177e4SLinus Torvalds */ 6361da177e4SLinus Torvalds if (!scsi_delete_timer(cmd)) 6371da177e4SLinus Torvalds return; 6381da177e4SLinus Torvalds __scsi_done(cmd); 6391da177e4SLinus Torvalds } 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvalds /* Private entry to scsi_done() to complete a command when the timer 6421da177e4SLinus Torvalds * isn't running --- used by scsi_times_out */ 6431da177e4SLinus Torvalds void __scsi_done(struct scsi_cmnd *cmd) 6441da177e4SLinus Torvalds { 6451aea6434SJens Axboe struct request *rq = cmd->request; 6461da177e4SLinus Torvalds 6471da177e4SLinus Torvalds /* 6481da177e4SLinus Torvalds * Set the serial numbers back to zero 6491da177e4SLinus Torvalds */ 6501da177e4SLinus Torvalds cmd->serial_number = 0; 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds atomic_inc(&cmd->device->iodone_cnt); 6531da177e4SLinus Torvalds if (cmd->result) 6541da177e4SLinus Torvalds atomic_inc(&cmd->device->ioerr_cnt); 6551da177e4SLinus Torvalds 6561aea6434SJens Axboe BUG_ON(!rq); 6571aea6434SJens Axboe 6581da177e4SLinus Torvalds /* 6591aea6434SJens Axboe * The uptodate/nbytes values don't matter, as we allow partial 6601aea6434SJens Axboe * completes and thus will check this in the softirq callback 6611da177e4SLinus Torvalds */ 6621aea6434SJens Axboe rq->completion_data = cmd; 6631aea6434SJens Axboe blk_complete_request(rq); 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvalds /* 6671da177e4SLinus Torvalds * Function: scsi_retry_command 6681da177e4SLinus Torvalds * 6691da177e4SLinus Torvalds * Purpose: Send a command back to the low level to be retried. 6701da177e4SLinus Torvalds * 6711da177e4SLinus Torvalds * Notes: This command is always executed in the context of the 6721da177e4SLinus Torvalds * bottom half handler, or the error handler thread. Low 6731da177e4SLinus Torvalds * level drivers should not become re-entrant as a result of 6741da177e4SLinus Torvalds * this. 6751da177e4SLinus Torvalds */ 6761aea6434SJens Axboe int scsi_retry_command(struct scsi_cmnd *cmd) 6771da177e4SLinus Torvalds { 6781da177e4SLinus Torvalds /* 6791da177e4SLinus Torvalds * Zero the sense information from the last time we tried 6801da177e4SLinus Torvalds * this command. 6811da177e4SLinus Torvalds */ 6821da177e4SLinus Torvalds memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer)); 6831da177e4SLinus Torvalds 6841da177e4SLinus Torvalds return scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY); 6851da177e4SLinus Torvalds } 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /* 6881da177e4SLinus Torvalds * Function: scsi_finish_command 6891da177e4SLinus Torvalds * 6901da177e4SLinus Torvalds * Purpose: Pass command off to upper layer for finishing of I/O 6911da177e4SLinus Torvalds * request, waking processes that are waiting on results, 6921da177e4SLinus Torvalds * etc. 6931da177e4SLinus Torvalds */ 6941da177e4SLinus Torvalds void scsi_finish_command(struct scsi_cmnd *cmd) 6951da177e4SLinus Torvalds { 6961da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 6971da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds scsi_device_unbusy(sdev); 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvalds /* 7021da177e4SLinus Torvalds * Clear the flags which say that the device/host is no longer 7031da177e4SLinus Torvalds * capable of accepting new commands. These are set in scsi_queue.c 7041da177e4SLinus Torvalds * for both the queue full condition on a device, and for a 7051da177e4SLinus Torvalds * host full condition on the host. 7061da177e4SLinus Torvalds * 7071da177e4SLinus Torvalds * XXX(hch): What about locking? 7081da177e4SLinus Torvalds */ 7091da177e4SLinus Torvalds shost->host_blocked = 0; 7101da177e4SLinus Torvalds sdev->device_blocked = 0; 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvalds /* 7131da177e4SLinus Torvalds * If we have valid sense information, then some kind of recovery 7141da177e4SLinus Torvalds * must have taken place. Make a note of this. 7151da177e4SLinus Torvalds */ 7161da177e4SLinus Torvalds if (SCSI_SENSE_VALID(cmd)) 7171da177e4SLinus Torvalds cmd->result |= (DRIVER_SENSE << 24); 7181da177e4SLinus Torvalds 7193bf743e7SJeff Garzik SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, 7203bf743e7SJeff Garzik "Notifying upper driver of completion " 7213bf743e7SJeff Garzik "(result %x)\n", cmd->result)); 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvalds cmd->done(cmd); 7241da177e4SLinus Torvalds } 7251da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_finish_command); 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvalds /* 7281da177e4SLinus Torvalds * Function: scsi_adjust_queue_depth() 7291da177e4SLinus Torvalds * 7301da177e4SLinus Torvalds * Purpose: Allow low level drivers to tell us to change the queue depth 7311da177e4SLinus Torvalds * on a specific SCSI device 7321da177e4SLinus Torvalds * 7331da177e4SLinus Torvalds * Arguments: sdev - SCSI Device in question 7341da177e4SLinus Torvalds * tagged - Do we use tagged queueing (non-0) or do we treat 7351da177e4SLinus Torvalds * this device as an untagged device (0) 7361da177e4SLinus Torvalds * tags - Number of tags allowed if tagged queueing enabled, 7371da177e4SLinus Torvalds * or number of commands the low level driver can 7381da177e4SLinus Torvalds * queue up in non-tagged mode (as per cmd_per_lun). 7391da177e4SLinus Torvalds * 7401da177e4SLinus Torvalds * Returns: Nothing 7411da177e4SLinus Torvalds * 7421da177e4SLinus Torvalds * Lock Status: None held on entry 7431da177e4SLinus Torvalds * 7441da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 7451da177e4SLinus Torvalds * the right thing depending on whether or not the device is 7461da177e4SLinus Torvalds * currently active and whether or not it even has the 7471da177e4SLinus Torvalds * command blocks built yet. 7481da177e4SLinus Torvalds */ 7491da177e4SLinus Torvalds void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) 7501da177e4SLinus Torvalds { 7511da177e4SLinus Torvalds unsigned long flags; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds /* 7541da177e4SLinus Torvalds * refuse to set tagged depth to an unworkable size 7551da177e4SLinus Torvalds */ 7561da177e4SLinus Torvalds if (tags <= 0) 7571da177e4SLinus Torvalds return; 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds /* Check to see if the queue is managed by the block layer 7621da177e4SLinus Torvalds * if it is, and we fail to adjust the depth, exit */ 7631da177e4SLinus Torvalds if (blk_queue_tagged(sdev->request_queue) && 7641da177e4SLinus Torvalds blk_queue_resize_tags(sdev->request_queue, tags) != 0) 7651da177e4SLinus Torvalds goto out; 7661da177e4SLinus Torvalds 7671da177e4SLinus Torvalds sdev->queue_depth = tags; 7681da177e4SLinus Torvalds switch (tagged) { 7691da177e4SLinus Torvalds case MSG_ORDERED_TAG: 7701da177e4SLinus Torvalds sdev->ordered_tags = 1; 7711da177e4SLinus Torvalds sdev->simple_tags = 1; 7721da177e4SLinus Torvalds break; 7731da177e4SLinus Torvalds case MSG_SIMPLE_TAG: 7741da177e4SLinus Torvalds sdev->ordered_tags = 0; 7751da177e4SLinus Torvalds sdev->simple_tags = 1; 7761da177e4SLinus Torvalds break; 7771da177e4SLinus Torvalds default: 7789ccfc756SJames Bottomley sdev_printk(KERN_WARNING, sdev, 7791da177e4SLinus Torvalds "scsi_adjust_queue_depth, bad queue type, " 7809ccfc756SJames Bottomley "disabled\n"); 7811da177e4SLinus Torvalds case 0: 7821da177e4SLinus Torvalds sdev->ordered_tags = sdev->simple_tags = 0; 7831da177e4SLinus Torvalds sdev->queue_depth = tags; 7841da177e4SLinus Torvalds break; 7851da177e4SLinus Torvalds } 7861da177e4SLinus Torvalds out: 7871da177e4SLinus Torvalds spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 7881da177e4SLinus Torvalds } 7891da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_adjust_queue_depth); 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvalds /* 7921da177e4SLinus Torvalds * Function: scsi_track_queue_full() 7931da177e4SLinus Torvalds * 7941da177e4SLinus Torvalds * Purpose: This function will track successive QUEUE_FULL events on a 7951da177e4SLinus Torvalds * specific SCSI device to determine if and when there is a 7961da177e4SLinus Torvalds * need to adjust the queue depth on the device. 7971da177e4SLinus Torvalds * 7981da177e4SLinus Torvalds * Arguments: sdev - SCSI Device in question 7991da177e4SLinus Torvalds * depth - Current number of outstanding SCSI commands on 8001da177e4SLinus Torvalds * this device, not counting the one returned as 8011da177e4SLinus Torvalds * QUEUE_FULL. 8021da177e4SLinus Torvalds * 8031da177e4SLinus Torvalds * Returns: 0 - No change needed 8041da177e4SLinus Torvalds * >0 - Adjust queue depth to this new depth 8051da177e4SLinus Torvalds * -1 - Drop back to untagged operation using host->cmd_per_lun 8061da177e4SLinus Torvalds * as the untagged command depth 8071da177e4SLinus Torvalds * 8081da177e4SLinus Torvalds * Lock Status: None held on entry 8091da177e4SLinus Torvalds * 8101da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 8111da177e4SLinus Torvalds * "The Right Thing." We are interrupt context safe. 8121da177e4SLinus Torvalds */ 8131da177e4SLinus Torvalds int scsi_track_queue_full(struct scsi_device *sdev, int depth) 8141da177e4SLinus Torvalds { 8151da177e4SLinus Torvalds if ((jiffies >> 4) == sdev->last_queue_full_time) 8161da177e4SLinus Torvalds return 0; 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvalds sdev->last_queue_full_time = (jiffies >> 4); 8191da177e4SLinus Torvalds if (sdev->last_queue_full_depth != depth) { 8201da177e4SLinus Torvalds sdev->last_queue_full_count = 1; 8211da177e4SLinus Torvalds sdev->last_queue_full_depth = depth; 8221da177e4SLinus Torvalds } else { 8231da177e4SLinus Torvalds sdev->last_queue_full_count++; 8241da177e4SLinus Torvalds } 8251da177e4SLinus Torvalds 8261da177e4SLinus Torvalds if (sdev->last_queue_full_count <= 10) 8271da177e4SLinus Torvalds return 0; 8281da177e4SLinus Torvalds if (sdev->last_queue_full_depth < 8) { 8291da177e4SLinus Torvalds /* Drop back to untagged */ 8301da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); 8311da177e4SLinus Torvalds return -1; 8321da177e4SLinus Torvalds } 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvalds if (sdev->ordered_tags) 8351da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth); 8361da177e4SLinus Torvalds else 8371da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 8381da177e4SLinus Torvalds return depth; 8391da177e4SLinus Torvalds } 8401da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_track_queue_full); 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvalds /** 8431da177e4SLinus Torvalds * scsi_device_get - get an addition reference to a scsi_device 8441da177e4SLinus Torvalds * @sdev: device to get a reference to 8451da177e4SLinus Torvalds * 8461da177e4SLinus Torvalds * Gets a reference to the scsi_device and increments the use count 8471da177e4SLinus Torvalds * of the underlying LLDD module. You must hold host_lock of the 8481da177e4SLinus Torvalds * parent Scsi_Host or already have a reference when calling this. 8491da177e4SLinus Torvalds */ 8501da177e4SLinus Torvalds int scsi_device_get(struct scsi_device *sdev) 8511da177e4SLinus Torvalds { 85285b6c720SJames Bottomley if (sdev->sdev_state == SDEV_DEL) 8531da177e4SLinus Torvalds return -ENXIO; 8541da177e4SLinus Torvalds if (!get_device(&sdev->sdev_gendev)) 8551da177e4SLinus Torvalds return -ENXIO; 85685b6c720SJames Bottomley /* We can fail this if we're doing SCSI operations 85785b6c720SJames Bottomley * from module exit (like cache flush) */ 85885b6c720SJames Bottomley try_module_get(sdev->host->hostt->module); 85985b6c720SJames Bottomley 8601da177e4SLinus Torvalds return 0; 8611da177e4SLinus Torvalds } 8621da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_get); 8631da177e4SLinus Torvalds 8641da177e4SLinus Torvalds /** 8651da177e4SLinus Torvalds * scsi_device_put - release a reference to a scsi_device 8661da177e4SLinus Torvalds * @sdev: device to release a reference on. 8671da177e4SLinus Torvalds * 8681da177e4SLinus Torvalds * Release a reference to the scsi_device and decrements the use count 8691da177e4SLinus Torvalds * of the underlying LLDD module. The device is freed once the last 8701da177e4SLinus Torvalds * user vanishes. 8711da177e4SLinus Torvalds */ 8721da177e4SLinus Torvalds void scsi_device_put(struct scsi_device *sdev) 8731da177e4SLinus Torvalds { 874f479ab87SJames Bottomley struct module *module = sdev->host->hostt->module; 875f479ab87SJames Bottomley 876a506b44bSDaniel Walker #ifdef CONFIG_MODULE_UNLOAD 87785b6c720SJames Bottomley /* The module refcount will be zero if scsi_device_get() 87885b6c720SJames Bottomley * was called from a module removal routine */ 879f479ab87SJames Bottomley if (module && module_refcount(module) != 0) 880f479ab87SJames Bottomley module_put(module); 881a506b44bSDaniel Walker #endif 8821da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_put); 8851da177e4SLinus Torvalds 8861da177e4SLinus Torvalds /* helper for shost_for_each_device, thus not documented */ 8871da177e4SLinus Torvalds struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, 8881da177e4SLinus Torvalds struct scsi_device *prev) 8891da177e4SLinus Torvalds { 8901da177e4SLinus Torvalds struct list_head *list = (prev ? &prev->siblings : &shost->__devices); 8911da177e4SLinus Torvalds struct scsi_device *next = NULL; 8921da177e4SLinus Torvalds unsigned long flags; 8931da177e4SLinus Torvalds 8941da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 8951da177e4SLinus Torvalds while (list->next != &shost->__devices) { 8961da177e4SLinus Torvalds next = list_entry(list->next, struct scsi_device, siblings); 8971da177e4SLinus Torvalds /* skip devices that we can't get a reference to */ 8981da177e4SLinus Torvalds if (!scsi_device_get(next)) 8991da177e4SLinus Torvalds break; 9001da177e4SLinus Torvalds next = NULL; 9011da177e4SLinus Torvalds list = list->next; 9021da177e4SLinus Torvalds } 9031da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 9041da177e4SLinus Torvalds 9051da177e4SLinus Torvalds if (prev) 9061da177e4SLinus Torvalds scsi_device_put(prev); 9071da177e4SLinus Torvalds return next; 9081da177e4SLinus Torvalds } 9091da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_iterate_devices); 9101da177e4SLinus Torvalds 9111da177e4SLinus Torvalds /** 9121da177e4SLinus Torvalds * starget_for_each_device - helper to walk all devices of a target 9131da177e4SLinus Torvalds * @starget: target whose devices we want to iterate over. 9141da177e4SLinus Torvalds * 9151da177e4SLinus Torvalds * This traverses over each devices of @shost. The devices have 9161da177e4SLinus Torvalds * a reference that must be released by scsi_host_put when breaking 9171da177e4SLinus Torvalds * out of the loop. 9181da177e4SLinus Torvalds */ 9191da177e4SLinus Torvalds void starget_for_each_device(struct scsi_target *starget, void * data, 9201da177e4SLinus Torvalds void (*fn)(struct scsi_device *, void *)) 9211da177e4SLinus Torvalds { 9221da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 9231da177e4SLinus Torvalds struct scsi_device *sdev; 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds shost_for_each_device(sdev, shost) { 9261da177e4SLinus Torvalds if ((sdev->channel == starget->channel) && 9271da177e4SLinus Torvalds (sdev->id == starget->id)) 9281da177e4SLinus Torvalds fn(sdev, data); 9291da177e4SLinus Torvalds } 9301da177e4SLinus Torvalds } 9311da177e4SLinus Torvalds EXPORT_SYMBOL(starget_for_each_device); 9321da177e4SLinus Torvalds 9331da177e4SLinus Torvalds /** 9341da177e4SLinus Torvalds * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) 9351da177e4SLinus Torvalds * @starget: SCSI target pointer 9361da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 9371da177e4SLinus Torvalds * 9381da177e4SLinus Torvalds * Looks up the scsi_device with the specified @lun for a give 9391da177e4SLinus Torvalds * @starget. The returned scsi_device does not have an additional 9401da177e4SLinus Torvalds * reference. You must hold the host's host_lock over this call and 9411da177e4SLinus Torvalds * any access to the returned scsi_device. 9421da177e4SLinus Torvalds * 9431da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 9441da177e4SLinus Torvalds * they're need to access the device list in irq context. Otherwise you 9451da177e4SLinus Torvalds * really want to use scsi_device_lookup_by_target instead. 9461da177e4SLinus Torvalds **/ 9471da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, 9481da177e4SLinus Torvalds uint lun) 9491da177e4SLinus Torvalds { 9501da177e4SLinus Torvalds struct scsi_device *sdev; 9511da177e4SLinus Torvalds 9521da177e4SLinus Torvalds list_for_each_entry(sdev, &starget->devices, same_target_siblings) { 9531da177e4SLinus Torvalds if (sdev->lun ==lun) 9541da177e4SLinus Torvalds return sdev; 9551da177e4SLinus Torvalds } 9561da177e4SLinus Torvalds 9571da177e4SLinus Torvalds return NULL; 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup_by_target); 9601da177e4SLinus Torvalds 9611da177e4SLinus Torvalds /** 9621da177e4SLinus Torvalds * scsi_device_lookup_by_target - find a device given the target 9631da177e4SLinus Torvalds * @starget: SCSI target pointer 9641da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 9651da177e4SLinus Torvalds * 9661da177e4SLinus Torvalds * Looks up the scsi_device with the specified @channel, @id, @lun for a 9671da177e4SLinus Torvalds * give host. The returned scsi_device has an additional reference that 9681da177e4SLinus Torvalds * needs to be release with scsi_host_put once you're done with it. 9691da177e4SLinus Torvalds **/ 9701da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, 9711da177e4SLinus Torvalds uint lun) 9721da177e4SLinus Torvalds { 9731da177e4SLinus Torvalds struct scsi_device *sdev; 9741da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 9751da177e4SLinus Torvalds unsigned long flags; 9761da177e4SLinus Torvalds 9771da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 9781da177e4SLinus Torvalds sdev = __scsi_device_lookup_by_target(starget, lun); 9791da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 9801da177e4SLinus Torvalds sdev = NULL; 9811da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 9821da177e4SLinus Torvalds 9831da177e4SLinus Torvalds return sdev; 9841da177e4SLinus Torvalds } 9851da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup_by_target); 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds /** 9881da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host (UNLOCKED) 9891da177e4SLinus Torvalds * @shost: SCSI host pointer 9901da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 9911da177e4SLinus Torvalds * @pun: SCSI target number (physical unit number) 9921da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 9931da177e4SLinus Torvalds * 9941da177e4SLinus Torvalds * Looks up the scsi_device with the specified @channel, @id, @lun for a 9951da177e4SLinus Torvalds * give host. The returned scsi_device does not have an additional reference. 9961da177e4SLinus Torvalds * You must hold the host's host_lock over this call and any access to the 9971da177e4SLinus Torvalds * returned scsi_device. 9981da177e4SLinus Torvalds * 9991da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 10001da177e4SLinus Torvalds * they're need to access the device list in irq context. Otherwise you 10011da177e4SLinus Torvalds * really want to use scsi_device_lookup instead. 10021da177e4SLinus Torvalds **/ 10031da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, 10041da177e4SLinus Torvalds uint channel, uint id, uint lun) 10051da177e4SLinus Torvalds { 10061da177e4SLinus Torvalds struct scsi_device *sdev; 10071da177e4SLinus Torvalds 10081da177e4SLinus Torvalds list_for_each_entry(sdev, &shost->__devices, siblings) { 10091da177e4SLinus Torvalds if (sdev->channel == channel && sdev->id == id && 10101da177e4SLinus Torvalds sdev->lun ==lun) 10111da177e4SLinus Torvalds return sdev; 10121da177e4SLinus Torvalds } 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds return NULL; 10151da177e4SLinus Torvalds } 10161da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup); 10171da177e4SLinus Torvalds 10181da177e4SLinus Torvalds /** 10191da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host 10201da177e4SLinus Torvalds * @shost: SCSI host pointer 10211da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 10221da177e4SLinus Torvalds * @id: SCSI target number (physical unit number) 10231da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 10241da177e4SLinus Torvalds * 10251da177e4SLinus Torvalds * Looks up the scsi_device with the specified @channel, @id, @lun for a 10261da177e4SLinus Torvalds * give host. The returned scsi_device has an additional reference that 10271da177e4SLinus Torvalds * needs to be release with scsi_host_put once you're done with it. 10281da177e4SLinus Torvalds **/ 10291da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, 10301da177e4SLinus Torvalds uint channel, uint id, uint lun) 10311da177e4SLinus Torvalds { 10321da177e4SLinus Torvalds struct scsi_device *sdev; 10331da177e4SLinus Torvalds unsigned long flags; 10341da177e4SLinus Torvalds 10351da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 10361da177e4SLinus Torvalds sdev = __scsi_device_lookup(shost, channel, id, lun); 10371da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 10381da177e4SLinus Torvalds sdev = NULL; 10391da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 10401da177e4SLinus Torvalds 10411da177e4SLinus Torvalds return sdev; 10421da177e4SLinus Torvalds } 10431da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup); 10441da177e4SLinus Torvalds 10451da177e4SLinus Torvalds /** 10461da177e4SLinus Torvalds * scsi_device_cancel - cancel outstanding IO to this device 10471da177e4SLinus Torvalds * @sdev: Pointer to struct scsi_device 10481da177e4SLinus Torvalds * @recovery: Boolean instructing function to recover device or not. 10491da177e4SLinus Torvalds * 10501da177e4SLinus Torvalds **/ 10511da177e4SLinus Torvalds int scsi_device_cancel(struct scsi_device *sdev, int recovery) 10521da177e4SLinus Torvalds { 10531da177e4SLinus Torvalds struct scsi_cmnd *scmd; 10541da177e4SLinus Torvalds LIST_HEAD(active_list); 10551da177e4SLinus Torvalds struct list_head *lh, *lh_sf; 10561da177e4SLinus Torvalds unsigned long flags; 10571da177e4SLinus Torvalds 10581da177e4SLinus Torvalds scsi_device_set_state(sdev, SDEV_CANCEL); 10591da177e4SLinus Torvalds 10601da177e4SLinus Torvalds spin_lock_irqsave(&sdev->list_lock, flags); 10611da177e4SLinus Torvalds list_for_each_entry(scmd, &sdev->cmd_list, list) { 1062cdd60262SJens Axboe if (scmd->request) { 10631da177e4SLinus Torvalds /* 10641da177e4SLinus Torvalds * If we are unable to remove the timer, it means 10651da177e4SLinus Torvalds * that the command has already timed out or 10661da177e4SLinus Torvalds * finished. 10671da177e4SLinus Torvalds */ 10681da177e4SLinus Torvalds if (!scsi_delete_timer(scmd)) 10691da177e4SLinus Torvalds continue; 10701da177e4SLinus Torvalds list_add_tail(&scmd->eh_entry, &active_list); 10711da177e4SLinus Torvalds } 10721da177e4SLinus Torvalds } 10731da177e4SLinus Torvalds spin_unlock_irqrestore(&sdev->list_lock, flags); 10741da177e4SLinus Torvalds 10751da177e4SLinus Torvalds if (!list_empty(&active_list)) { 10761da177e4SLinus Torvalds list_for_each_safe(lh, lh_sf, &active_list) { 10771da177e4SLinus Torvalds scmd = list_entry(lh, struct scsi_cmnd, eh_entry); 10781da177e4SLinus Torvalds list_del_init(lh); 1079939647eeSJames Bottomley if (recovery && 1080939647eeSJames Bottomley !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) { 10811da177e4SLinus Torvalds scmd->result = (DID_ABORT << 16); 10821da177e4SLinus Torvalds scsi_finish_command(scmd); 10831da177e4SLinus Torvalds } 10841da177e4SLinus Torvalds } 10851da177e4SLinus Torvalds } 10861da177e4SLinus Torvalds 10871da177e4SLinus Torvalds return 0; 10881da177e4SLinus Torvalds } 10891da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_cancel); 10901da177e4SLinus Torvalds 10911da177e4SLinus Torvalds MODULE_DESCRIPTION("SCSI core"); 10921da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 10931da177e4SLinus Torvalds 10941da177e4SLinus Torvalds module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); 10951da177e4SLinus Torvalds MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); 10961da177e4SLinus Torvalds 10971da177e4SLinus Torvalds static int __init init_scsi(void) 10981da177e4SLinus Torvalds { 10999bf09c23SJens Axboe int error; 11001da177e4SLinus Torvalds 11011da177e4SLinus Torvalds error = scsi_init_queue(); 11021da177e4SLinus Torvalds if (error) 11031da177e4SLinus Torvalds return error; 11041da177e4SLinus Torvalds error = scsi_init_procfs(); 11051da177e4SLinus Torvalds if (error) 11061da177e4SLinus Torvalds goto cleanup_queue; 11071da177e4SLinus Torvalds error = scsi_init_devinfo(); 11081da177e4SLinus Torvalds if (error) 11091da177e4SLinus Torvalds goto cleanup_procfs; 11101da177e4SLinus Torvalds error = scsi_init_hosts(); 11111da177e4SLinus Torvalds if (error) 11121da177e4SLinus Torvalds goto cleanup_devlist; 11131da177e4SLinus Torvalds error = scsi_init_sysctl(); 11141da177e4SLinus Torvalds if (error) 11151da177e4SLinus Torvalds goto cleanup_hosts; 11161da177e4SLinus Torvalds error = scsi_sysfs_register(); 11171da177e4SLinus Torvalds if (error) 11181da177e4SLinus Torvalds goto cleanup_sysctl; 11191da177e4SLinus Torvalds 112084314fd4SJames Smart scsi_netlink_init(); 112184314fd4SJames Smart 11221da177e4SLinus Torvalds printk(KERN_NOTICE "SCSI subsystem initialized\n"); 11231da177e4SLinus Torvalds return 0; 11241da177e4SLinus Torvalds 11251da177e4SLinus Torvalds cleanup_sysctl: 11261da177e4SLinus Torvalds scsi_exit_sysctl(); 11271da177e4SLinus Torvalds cleanup_hosts: 11281da177e4SLinus Torvalds scsi_exit_hosts(); 11291da177e4SLinus Torvalds cleanup_devlist: 11301da177e4SLinus Torvalds scsi_exit_devinfo(); 11311da177e4SLinus Torvalds cleanup_procfs: 11321da177e4SLinus Torvalds scsi_exit_procfs(); 11331da177e4SLinus Torvalds cleanup_queue: 11341da177e4SLinus Torvalds scsi_exit_queue(); 11351da177e4SLinus Torvalds printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", 11361da177e4SLinus Torvalds -error); 11371da177e4SLinus Torvalds return error; 11381da177e4SLinus Torvalds } 11391da177e4SLinus Torvalds 11401da177e4SLinus Torvalds static void __exit exit_scsi(void) 11411da177e4SLinus Torvalds { 114284314fd4SJames Smart scsi_netlink_exit(); 11431da177e4SLinus Torvalds scsi_sysfs_unregister(); 11441da177e4SLinus Torvalds scsi_exit_sysctl(); 11451da177e4SLinus Torvalds scsi_exit_hosts(); 11461da177e4SLinus Torvalds scsi_exit_devinfo(); 11471da177e4SLinus Torvalds scsi_exit_procfs(); 11481da177e4SLinus Torvalds scsi_exit_queue(); 11491da177e4SLinus Torvalds } 11501da177e4SLinus Torvalds 11511da177e4SLinus Torvalds subsys_initcall(init_scsi); 11521da177e4SLinus Torvalds module_exit(exit_scsi); 1153