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 991da177e4SLinus Torvalds const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE] = { 1001da177e4SLinus Torvalds "Direct-Access ", 1011da177e4SLinus Torvalds "Sequential-Access", 1021da177e4SLinus Torvalds "Printer ", 1031da177e4SLinus Torvalds "Processor ", 1041da177e4SLinus Torvalds "WORM ", 1051da177e4SLinus Torvalds "CD-ROM ", 1061da177e4SLinus Torvalds "Scanner ", 1071da177e4SLinus Torvalds "Optical Device ", 1081da177e4SLinus Torvalds "Medium Changer ", 1091da177e4SLinus Torvalds "Communications ", 1101da177e4SLinus Torvalds "Unknown ", 1111da177e4SLinus Torvalds "Unknown ", 1121da177e4SLinus Torvalds "RAID ", 1131da177e4SLinus Torvalds "Enclosure ", 1147f602c53SJames Bottomley "Direct-Access-RBC", 1151da177e4SLinus Torvalds }; 1161da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_types); 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds struct scsi_host_cmd_pool { 1191da177e4SLinus Torvalds kmem_cache_t *slab; 1201da177e4SLinus Torvalds unsigned int users; 1211da177e4SLinus Torvalds char *name; 1221da177e4SLinus Torvalds unsigned int slab_flags; 123c53033f6SAl Viro gfp_t gfp_mask; 1241da177e4SLinus Torvalds }; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds static struct scsi_host_cmd_pool scsi_cmd_pool = { 1271da177e4SLinus Torvalds .name = "scsi_cmd_cache", 1281da177e4SLinus Torvalds .slab_flags = SLAB_HWCACHE_ALIGN, 1291da177e4SLinus Torvalds }; 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { 1321da177e4SLinus Torvalds .name = "scsi_cmd_cache(DMA)", 1331da177e4SLinus Torvalds .slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, 1341da177e4SLinus Torvalds .gfp_mask = __GFP_DMA, 1351da177e4SLinus Torvalds }; 1361da177e4SLinus Torvalds 1370b950672SArjan van de Ven static DEFINE_MUTEX(host_cmd_pool_mutex); 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, 140c53033f6SAl Viro gfp_t gfp_mask) 1411da177e4SLinus Torvalds { 1421da177e4SLinus Torvalds struct scsi_cmnd *cmd; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds cmd = kmem_cache_alloc(shost->cmd_pool->slab, 1451da177e4SLinus Torvalds gfp_mask | shost->cmd_pool->gfp_mask); 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds if (unlikely(!cmd)) { 1481da177e4SLinus Torvalds unsigned long flags; 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvalds spin_lock_irqsave(&shost->free_list_lock, flags); 1511da177e4SLinus Torvalds if (likely(!list_empty(&shost->free_list))) { 1521da177e4SLinus Torvalds cmd = list_entry(shost->free_list.next, 1531da177e4SLinus Torvalds struct scsi_cmnd, list); 1541da177e4SLinus Torvalds list_del_init(&cmd->list); 1551da177e4SLinus Torvalds } 1561da177e4SLinus Torvalds spin_unlock_irqrestore(&shost->free_list_lock, flags); 1571da177e4SLinus Torvalds } 1581da177e4SLinus Torvalds 1591da177e4SLinus Torvalds return cmd; 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds /* 1631da177e4SLinus Torvalds * Function: scsi_get_command() 1641da177e4SLinus Torvalds * 1651da177e4SLinus Torvalds * Purpose: Allocate and setup a scsi command block 1661da177e4SLinus Torvalds * 1671da177e4SLinus Torvalds * Arguments: dev - parent scsi device 1681da177e4SLinus Torvalds * gfp_mask- allocator flags 1691da177e4SLinus Torvalds * 1701da177e4SLinus Torvalds * Returns: The allocated scsi command structure. 1711da177e4SLinus Torvalds */ 172c53033f6SAl Viro struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) 1731da177e4SLinus Torvalds { 1741da177e4SLinus Torvalds struct scsi_cmnd *cmd; 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvalds /* Bail if we can't get a reference to the device */ 1771da177e4SLinus Torvalds if (!get_device(&dev->sdev_gendev)) 1781da177e4SLinus Torvalds return NULL; 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds cmd = __scsi_get_command(dev->host, gfp_mask); 1811da177e4SLinus Torvalds 1821da177e4SLinus Torvalds if (likely(cmd != NULL)) { 1831da177e4SLinus Torvalds unsigned long flags; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds memset(cmd, 0, sizeof(*cmd)); 1861da177e4SLinus Torvalds cmd->device = dev; 1871da177e4SLinus Torvalds init_timer(&cmd->eh_timeout); 1881da177e4SLinus Torvalds INIT_LIST_HEAD(&cmd->list); 1891da177e4SLinus Torvalds spin_lock_irqsave(&dev->list_lock, flags); 1901da177e4SLinus Torvalds list_add_tail(&cmd->list, &dev->cmd_list); 1911da177e4SLinus Torvalds spin_unlock_irqrestore(&dev->list_lock, flags); 19279e448bfSMatthew Dobson cmd->jiffies_at_alloc = jiffies; 1931da177e4SLinus Torvalds } else 1941da177e4SLinus Torvalds put_device(&dev->sdev_gendev); 1951da177e4SLinus Torvalds 1961da177e4SLinus Torvalds return cmd; 1971da177e4SLinus Torvalds } 1981da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_get_command); 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvalds /* 2011da177e4SLinus Torvalds * Function: scsi_put_command() 2021da177e4SLinus Torvalds * 2031da177e4SLinus Torvalds * Purpose: Free a scsi command block 2041da177e4SLinus Torvalds * 2051da177e4SLinus Torvalds * Arguments: cmd - command block to free 2061da177e4SLinus Torvalds * 2071da177e4SLinus Torvalds * Returns: Nothing. 2081da177e4SLinus Torvalds * 2091da177e4SLinus Torvalds * Notes: The command must not belong to any lists. 2101da177e4SLinus Torvalds */ 2111da177e4SLinus Torvalds void scsi_put_command(struct scsi_cmnd *cmd) 2121da177e4SLinus Torvalds { 2131da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 2141da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 2151da177e4SLinus Torvalds unsigned long flags; 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvalds /* serious error if the command hasn't come from a device list */ 2181da177e4SLinus Torvalds spin_lock_irqsave(&cmd->device->list_lock, flags); 2191da177e4SLinus Torvalds BUG_ON(list_empty(&cmd->list)); 2201da177e4SLinus Torvalds list_del_init(&cmd->list); 2211da177e4SLinus Torvalds spin_unlock(&cmd->device->list_lock); 2221da177e4SLinus Torvalds /* changing locks here, don't need to restore the irq state */ 2231da177e4SLinus Torvalds spin_lock(&shost->free_list_lock); 2241da177e4SLinus Torvalds if (unlikely(list_empty(&shost->free_list))) { 2251da177e4SLinus Torvalds list_add(&cmd->list, &shost->free_list); 2261da177e4SLinus Torvalds cmd = NULL; 2271da177e4SLinus Torvalds } 2281da177e4SLinus Torvalds spin_unlock_irqrestore(&shost->free_list_lock, flags); 2291da177e4SLinus Torvalds 2301da177e4SLinus Torvalds if (likely(cmd != NULL)) 2311da177e4SLinus Torvalds kmem_cache_free(shost->cmd_pool->slab, cmd); 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_put_command); 2361da177e4SLinus Torvalds 2371da177e4SLinus Torvalds /* 2381da177e4SLinus Torvalds * Function: scsi_setup_command_freelist() 2391da177e4SLinus Torvalds * 2401da177e4SLinus Torvalds * Purpose: Setup the command freelist for a scsi host. 2411da177e4SLinus Torvalds * 2421da177e4SLinus Torvalds * Arguments: shost - host to allocate the freelist for. 2431da177e4SLinus Torvalds * 2441da177e4SLinus Torvalds * Returns: Nothing. 2451da177e4SLinus Torvalds */ 2461da177e4SLinus Torvalds int scsi_setup_command_freelist(struct Scsi_Host *shost) 2471da177e4SLinus Torvalds { 2481da177e4SLinus Torvalds struct scsi_host_cmd_pool *pool; 2491da177e4SLinus Torvalds struct scsi_cmnd *cmd; 2501da177e4SLinus Torvalds 2511da177e4SLinus Torvalds spin_lock_init(&shost->free_list_lock); 2521da177e4SLinus Torvalds INIT_LIST_HEAD(&shost->free_list); 2531da177e4SLinus Torvalds 2541da177e4SLinus Torvalds /* 2551da177e4SLinus Torvalds * Select a command slab for this host and create it if not 2561da177e4SLinus Torvalds * yet existant. 2571da177e4SLinus Torvalds */ 2580b950672SArjan van de Ven mutex_lock(&host_cmd_pool_mutex); 2591da177e4SLinus Torvalds pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool); 2601da177e4SLinus Torvalds if (!pool->users) { 2611da177e4SLinus Torvalds pool->slab = kmem_cache_create(pool->name, 2621da177e4SLinus Torvalds sizeof(struct scsi_cmnd), 0, 2631da177e4SLinus Torvalds pool->slab_flags, NULL, NULL); 2641da177e4SLinus Torvalds if (!pool->slab) 2651da177e4SLinus Torvalds goto fail; 2661da177e4SLinus Torvalds } 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds pool->users++; 2691da177e4SLinus Torvalds shost->cmd_pool = pool; 2700b950672SArjan van de Ven mutex_unlock(&host_cmd_pool_mutex); 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds /* 2731da177e4SLinus Torvalds * Get one backup command for this host. 2741da177e4SLinus Torvalds */ 2751da177e4SLinus Torvalds cmd = kmem_cache_alloc(shost->cmd_pool->slab, 2761da177e4SLinus Torvalds GFP_KERNEL | shost->cmd_pool->gfp_mask); 2771da177e4SLinus Torvalds if (!cmd) 2781da177e4SLinus Torvalds goto fail2; 2791da177e4SLinus Torvalds list_add(&cmd->list, &shost->free_list); 2801da177e4SLinus Torvalds return 0; 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds fail2: 2831da177e4SLinus Torvalds if (!--pool->users) 2841da177e4SLinus Torvalds kmem_cache_destroy(pool->slab); 2851da177e4SLinus Torvalds return -ENOMEM; 2861da177e4SLinus Torvalds fail: 2870b950672SArjan van de Ven mutex_unlock(&host_cmd_pool_mutex); 2881da177e4SLinus Torvalds return -ENOMEM; 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds } 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvalds /* 2931da177e4SLinus Torvalds * Function: scsi_destroy_command_freelist() 2941da177e4SLinus Torvalds * 2951da177e4SLinus Torvalds * Purpose: Release the command freelist for a scsi host. 2961da177e4SLinus Torvalds * 2971da177e4SLinus Torvalds * Arguments: shost - host that's freelist is going to be destroyed 2981da177e4SLinus Torvalds */ 2991da177e4SLinus Torvalds void scsi_destroy_command_freelist(struct Scsi_Host *shost) 3001da177e4SLinus Torvalds { 3011da177e4SLinus Torvalds while (!list_empty(&shost->free_list)) { 3021da177e4SLinus Torvalds struct scsi_cmnd *cmd; 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); 3051da177e4SLinus Torvalds list_del_init(&cmd->list); 3061da177e4SLinus Torvalds kmem_cache_free(shost->cmd_pool->slab, cmd); 3071da177e4SLinus Torvalds } 3081da177e4SLinus Torvalds 3090b950672SArjan van de Ven mutex_lock(&host_cmd_pool_mutex); 3101da177e4SLinus Torvalds if (!--shost->cmd_pool->users) 3111da177e4SLinus Torvalds kmem_cache_destroy(shost->cmd_pool->slab); 3120b950672SArjan van de Ven mutex_unlock(&host_cmd_pool_mutex); 3131da177e4SLinus Torvalds } 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvalds #ifdef CONFIG_SCSI_LOGGING 3161da177e4SLinus Torvalds void scsi_log_send(struct scsi_cmnd *cmd) 3171da177e4SLinus Torvalds { 3181da177e4SLinus Torvalds unsigned int level; 3191da177e4SLinus Torvalds struct scsi_device *sdev; 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds /* 3221da177e4SLinus Torvalds * If ML QUEUE log level is greater than or equal to: 3231da177e4SLinus Torvalds * 3241da177e4SLinus Torvalds * 1: nothing (match completion) 3251da177e4SLinus Torvalds * 3261da177e4SLinus Torvalds * 2: log opcode + command of all commands 3271da177e4SLinus Torvalds * 3281da177e4SLinus Torvalds * 3: same as 2 plus dump cmd address 3291da177e4SLinus Torvalds * 3301da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 3311da177e4SLinus Torvalds */ 3321da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 3331da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, 3341da177e4SLinus Torvalds SCSI_LOG_MLQUEUE_BITS); 3351da177e4SLinus Torvalds if (level > 1) { 3361da177e4SLinus Torvalds sdev = cmd->device; 3379ccfc756SJames Bottomley sdev_printk(KERN_INFO, sdev, "send "); 3381da177e4SLinus Torvalds if (level > 2) 3391da177e4SLinus Torvalds printk("0x%p ", cmd); 3401da177e4SLinus Torvalds /* 3411da177e4SLinus Torvalds * spaces to match disposition and cmd->result 3421da177e4SLinus Torvalds * output in scsi_log_completion. 3431da177e4SLinus Torvalds */ 3441da177e4SLinus Torvalds printk(" "); 3451da177e4SLinus Torvalds scsi_print_command(cmd); 3461da177e4SLinus Torvalds if (level > 3) { 3471da177e4SLinus Torvalds printk(KERN_INFO "buffer = 0x%p, bufflen = %d," 3481da177e4SLinus Torvalds " done = 0x%p, queuecommand 0x%p\n", 349631c228cSChristoph Hellwig cmd->request_buffer, cmd->request_bufflen, 3501da177e4SLinus Torvalds cmd->done, 3511da177e4SLinus Torvalds sdev->host->hostt->queuecommand); 3521da177e4SLinus Torvalds 3531da177e4SLinus Torvalds } 3541da177e4SLinus Torvalds } 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds } 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) 3591da177e4SLinus Torvalds { 3601da177e4SLinus Torvalds unsigned int level; 3611da177e4SLinus Torvalds struct scsi_device *sdev; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds /* 3641da177e4SLinus Torvalds * If ML COMPLETE log level is greater than or equal to: 3651da177e4SLinus Torvalds * 3661da177e4SLinus Torvalds * 1: log disposition, result, opcode + command, and conditionally 3671da177e4SLinus Torvalds * sense data for failures or non SUCCESS dispositions. 3681da177e4SLinus Torvalds * 3691da177e4SLinus Torvalds * 2: same as 1 but for all command completions. 3701da177e4SLinus Torvalds * 3711da177e4SLinus Torvalds * 3: same as 2 plus dump cmd address 3721da177e4SLinus Torvalds * 3731da177e4SLinus Torvalds * 4: same as 3 plus dump extra junk 3741da177e4SLinus Torvalds */ 3751da177e4SLinus Torvalds if (unlikely(scsi_logging_level)) { 3761da177e4SLinus Torvalds level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, 3771da177e4SLinus Torvalds SCSI_LOG_MLCOMPLETE_BITS); 3781da177e4SLinus Torvalds if (((level > 0) && (cmd->result || disposition != SUCCESS)) || 3791da177e4SLinus Torvalds (level > 1)) { 3801da177e4SLinus Torvalds sdev = cmd->device; 3819ccfc756SJames Bottomley sdev_printk(KERN_INFO, sdev, "done "); 3821da177e4SLinus Torvalds if (level > 2) 3831da177e4SLinus Torvalds printk("0x%p ", cmd); 3841da177e4SLinus Torvalds /* 3851da177e4SLinus Torvalds * Dump truncated values, so we usually fit within 3861da177e4SLinus Torvalds * 80 chars. 3871da177e4SLinus Torvalds */ 3881da177e4SLinus Torvalds switch (disposition) { 3891da177e4SLinus Torvalds case SUCCESS: 3901da177e4SLinus Torvalds printk("SUCCESS"); 3911da177e4SLinus Torvalds break; 3921da177e4SLinus Torvalds case NEEDS_RETRY: 3931da177e4SLinus Torvalds printk("RETRY "); 3941da177e4SLinus Torvalds break; 3951da177e4SLinus Torvalds case ADD_TO_MLQUEUE: 3961da177e4SLinus Torvalds printk("MLQUEUE"); 3971da177e4SLinus Torvalds break; 3981da177e4SLinus Torvalds case FAILED: 3991da177e4SLinus Torvalds printk("FAILED "); 4001da177e4SLinus Torvalds break; 4011da177e4SLinus Torvalds case TIMEOUT_ERROR: 4021da177e4SLinus Torvalds /* 4031da177e4SLinus Torvalds * If called via scsi_times_out. 4041da177e4SLinus Torvalds */ 4051da177e4SLinus Torvalds printk("TIMEOUT"); 4061da177e4SLinus Torvalds break; 4071da177e4SLinus Torvalds default: 4081da177e4SLinus Torvalds printk("UNKNOWN"); 4091da177e4SLinus Torvalds } 4101da177e4SLinus Torvalds printk(" %8x ", cmd->result); 4111da177e4SLinus Torvalds scsi_print_command(cmd); 4121da177e4SLinus Torvalds if (status_byte(cmd->result) & CHECK_CONDITION) { 4131da177e4SLinus Torvalds /* 414db9dff36S * XXX The scsi_print_sense formatting/prefix 4151da177e4SLinus Torvalds * doesn't match this function. 4161da177e4SLinus Torvalds */ 4171da177e4SLinus Torvalds scsi_print_sense("", cmd); 4181da177e4SLinus Torvalds } 4191da177e4SLinus Torvalds if (level > 3) { 4201da177e4SLinus Torvalds printk(KERN_INFO "scsi host busy %d failed %d\n", 4211da177e4SLinus Torvalds sdev->host->host_busy, 4221da177e4SLinus Torvalds sdev->host->host_failed); 4231da177e4SLinus Torvalds } 4241da177e4SLinus Torvalds } 4251da177e4SLinus Torvalds } 4261da177e4SLinus Torvalds } 4271da177e4SLinus Torvalds #endif 4281da177e4SLinus Torvalds 4291da177e4SLinus Torvalds /* 4301da177e4SLinus Torvalds * Assign a serial number and pid to the request for error recovery 4311da177e4SLinus Torvalds * and debugging purposes. Protected by the Host_Lock of host. 4321da177e4SLinus Torvalds */ 4331da177e4SLinus Torvalds static inline void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) 4341da177e4SLinus Torvalds { 4351da177e4SLinus Torvalds cmd->serial_number = host->cmd_serial_number++; 4361da177e4SLinus Torvalds if (cmd->serial_number == 0) 4371da177e4SLinus Torvalds cmd->serial_number = host->cmd_serial_number++; 4381da177e4SLinus Torvalds 4391da177e4SLinus Torvalds cmd->pid = host->cmd_pid++; 4401da177e4SLinus Torvalds if (cmd->pid == 0) 4411da177e4SLinus Torvalds cmd->pid = host->cmd_pid++; 4421da177e4SLinus Torvalds } 4431da177e4SLinus Torvalds 4441da177e4SLinus Torvalds /* 4451da177e4SLinus Torvalds * Function: scsi_dispatch_command 4461da177e4SLinus Torvalds * 4471da177e4SLinus Torvalds * Purpose: Dispatch a command to the low-level driver. 4481da177e4SLinus Torvalds * 4491da177e4SLinus Torvalds * Arguments: cmd - command block we are dispatching. 4501da177e4SLinus Torvalds * 4511da177e4SLinus Torvalds * Notes: 4521da177e4SLinus Torvalds */ 4531da177e4SLinus Torvalds int scsi_dispatch_cmd(struct scsi_cmnd *cmd) 4541da177e4SLinus Torvalds { 4551da177e4SLinus Torvalds struct Scsi_Host *host = cmd->device->host; 4561da177e4SLinus Torvalds unsigned long flags = 0; 4571da177e4SLinus Torvalds unsigned long timeout; 4581da177e4SLinus Torvalds int rtn = 0; 4591da177e4SLinus Torvalds 4601da177e4SLinus Torvalds /* check if the device is still usable */ 4611da177e4SLinus Torvalds if (unlikely(cmd->device->sdev_state == SDEV_DEL)) { 4621da177e4SLinus Torvalds /* in SDEV_DEL we error all commands. DID_NO_CONNECT 4631da177e4SLinus Torvalds * returns an immediate error upwards, and signals 4641da177e4SLinus Torvalds * that the device is no longer present */ 4651da177e4SLinus Torvalds cmd->result = DID_NO_CONNECT << 16; 4661da177e4SLinus Torvalds atomic_inc(&cmd->device->iorequest_cnt); 46769b52893SMike Christie __scsi_done(cmd); 4681da177e4SLinus Torvalds /* return 0 (because the command has been processed) */ 4691da177e4SLinus Torvalds goto out; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds /* Check to see if the scsi lld put this device into state SDEV_BLOCK. */ 4731da177e4SLinus Torvalds if (unlikely(cmd->device->sdev_state == SDEV_BLOCK)) { 4741da177e4SLinus Torvalds /* 4751da177e4SLinus Torvalds * in SDEV_BLOCK, the command is just put back on the device 4761da177e4SLinus Torvalds * queue. The suspend state has already blocked the queue so 4771da177e4SLinus Torvalds * future requests should not occur until the device 4781da177e4SLinus Torvalds * transitions out of the suspend state. 4791da177e4SLinus Torvalds */ 4801da177e4SLinus Torvalds scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); 4811da177e4SLinus Torvalds 4821da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, printk("queuecommand : device blocked \n")); 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds /* 4851da177e4SLinus Torvalds * NOTE: rtn is still zero here because we don't need the 4861da177e4SLinus Torvalds * queue to be plugged on return (it's already stopped) 4871da177e4SLinus Torvalds */ 4881da177e4SLinus Torvalds goto out; 4891da177e4SLinus Torvalds } 4901da177e4SLinus Torvalds 4911da177e4SLinus Torvalds /* 4921da177e4SLinus Torvalds * If SCSI-2 or lower, store the LUN value in cmnd. 4931da177e4SLinus Torvalds */ 4944d7db04aSJames Bottomley if (cmd->device->scsi_level <= SCSI_2 && 4954d7db04aSJames Bottomley cmd->device->scsi_level != SCSI_UNKNOWN) { 4961da177e4SLinus Torvalds cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) | 4971da177e4SLinus Torvalds (cmd->device->lun << 5 & 0xe0); 4981da177e4SLinus Torvalds } 4991da177e4SLinus Torvalds 5001da177e4SLinus Torvalds /* 5011da177e4SLinus Torvalds * We will wait MIN_RESET_DELAY clock ticks after the last reset so 5021da177e4SLinus Torvalds * we can avoid the drive not being ready. 5031da177e4SLinus Torvalds */ 5041da177e4SLinus Torvalds timeout = host->last_reset + MIN_RESET_DELAY; 5051da177e4SLinus Torvalds 5061da177e4SLinus Torvalds if (host->resetting && time_before(jiffies, timeout)) { 5071da177e4SLinus Torvalds int ticks_remaining = timeout - jiffies; 5081da177e4SLinus Torvalds /* 5091da177e4SLinus Torvalds * NOTE: This may be executed from within an interrupt 5101da177e4SLinus Torvalds * handler! This is bad, but for now, it'll do. The irq 5111da177e4SLinus Torvalds * level of the interrupt handler has been masked out by the 5121da177e4SLinus Torvalds * platform dependent interrupt handling code already, so the 5131da177e4SLinus Torvalds * sti() here will not cause another call to the SCSI host's 5141da177e4SLinus Torvalds * interrupt handler (assuming there is one irq-level per 5151da177e4SLinus Torvalds * host). 5161da177e4SLinus Torvalds */ 5171da177e4SLinus Torvalds while (--ticks_remaining >= 0) 5181da177e4SLinus Torvalds mdelay(1 + 999 / HZ); 5191da177e4SLinus Torvalds host->resetting = 0; 5201da177e4SLinus Torvalds } 5211da177e4SLinus Torvalds 5221da177e4SLinus Torvalds /* 5231da177e4SLinus Torvalds * AK: unlikely race here: for some reason the timer could 5241da177e4SLinus Torvalds * expire before the serial number is set up below. 5251da177e4SLinus Torvalds */ 5261da177e4SLinus Torvalds scsi_add_timer(cmd, cmd->timeout_per_command, scsi_times_out); 5271da177e4SLinus Torvalds 5281da177e4SLinus Torvalds scsi_log_send(cmd); 5291da177e4SLinus Torvalds 5301da177e4SLinus Torvalds /* 5311da177e4SLinus Torvalds * We will use a queued command if possible, otherwise we will 5321da177e4SLinus Torvalds * emulate the queuing and calling of completion function ourselves. 5331da177e4SLinus Torvalds */ 5341da177e4SLinus Torvalds atomic_inc(&cmd->device->iorequest_cnt); 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvalds /* 5371da177e4SLinus Torvalds * Before we queue this command, check if the command 5381da177e4SLinus Torvalds * length exceeds what the host adapter can handle. 5391da177e4SLinus Torvalds */ 5401da177e4SLinus Torvalds if (CDB_SIZE(cmd) > cmd->device->host->max_cmd_len) { 5411da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, 5421da177e4SLinus Torvalds printk("queuecommand : command too long.\n")); 5431da177e4SLinus Torvalds cmd->result = (DID_ABORT << 16); 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds scsi_done(cmd); 5461da177e4SLinus Torvalds goto out; 5471da177e4SLinus Torvalds } 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvalds spin_lock_irqsave(host->host_lock, flags); 5501da177e4SLinus Torvalds scsi_cmd_get_serial(host, cmd); 5511da177e4SLinus Torvalds 552d2c9d9eaSMike Anderson if (unlikely(host->shost_state == SHOST_DEL)) { 5531da177e4SLinus Torvalds cmd->result = (DID_NO_CONNECT << 16); 5541da177e4SLinus Torvalds scsi_done(cmd); 5551da177e4SLinus Torvalds } else { 5561da177e4SLinus Torvalds rtn = host->hostt->queuecommand(cmd, scsi_done); 5571da177e4SLinus Torvalds } 5581da177e4SLinus Torvalds spin_unlock_irqrestore(host->host_lock, flags); 5591da177e4SLinus Torvalds if (rtn) { 560d8c37e7bSTejun Heo if (scsi_delete_timer(cmd)) { 5611da177e4SLinus Torvalds atomic_inc(&cmd->device->iodone_cnt); 5621da177e4SLinus Torvalds scsi_queue_insert(cmd, 5631da177e4SLinus Torvalds (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ? 5641da177e4SLinus Torvalds rtn : SCSI_MLQUEUE_HOST_BUSY); 565d8c37e7bSTejun Heo } 5661da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, 5671da177e4SLinus Torvalds printk("queuecommand : request rejected\n")); 5681da177e4SLinus Torvalds } 5691da177e4SLinus Torvalds 5701da177e4SLinus Torvalds out: 5711da177e4SLinus Torvalds SCSI_LOG_MLQUEUE(3, printk("leaving scsi_dispatch_cmnd()\n")); 5721da177e4SLinus Torvalds return rtn; 5731da177e4SLinus Torvalds } 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds /* 5771da177e4SLinus Torvalds * Per-CPU I/O completion queue. 5781da177e4SLinus Torvalds */ 5791da177e4SLinus Torvalds static DEFINE_PER_CPU(struct list_head, scsi_done_q); 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvalds /** 58289f48c4dSLuben Tuikov * scsi_req_abort_cmd -- Request command recovery for the specified command 58389f48c4dSLuben Tuikov * cmd: pointer to the SCSI command of interest 58489f48c4dSLuben Tuikov * 58589f48c4dSLuben Tuikov * This function requests that SCSI Core start recovery for the 58689f48c4dSLuben Tuikov * command by deleting the timer and adding the command to the eh 58789f48c4dSLuben Tuikov * queue. It can be called by either LLDDs or SCSI Core. LLDDs who 58889f48c4dSLuben Tuikov * implement their own error recovery MAY ignore the timeout event if 58989f48c4dSLuben Tuikov * they generated scsi_req_abort_cmd. 59089f48c4dSLuben Tuikov */ 59189f48c4dSLuben Tuikov void scsi_req_abort_cmd(struct scsi_cmnd *cmd) 59289f48c4dSLuben Tuikov { 59389f48c4dSLuben Tuikov if (!scsi_delete_timer(cmd)) 59489f48c4dSLuben Tuikov return; 59589f48c4dSLuben Tuikov scsi_times_out(cmd); 59689f48c4dSLuben Tuikov } 59789f48c4dSLuben Tuikov EXPORT_SYMBOL(scsi_req_abort_cmd); 59889f48c4dSLuben Tuikov 59989f48c4dSLuben Tuikov /** 6001da177e4SLinus Torvalds * scsi_done - Enqueue the finished SCSI command into the done queue. 6011da177e4SLinus Torvalds * @cmd: The SCSI Command for which a low-level device driver (LLDD) gives 6021da177e4SLinus Torvalds * ownership back to SCSI Core -- i.e. the LLDD has finished with it. 6031da177e4SLinus Torvalds * 6041da177e4SLinus Torvalds * This function is the mid-level's (SCSI Core) interrupt routine, which 6051da177e4SLinus Torvalds * regains ownership of the SCSI command (de facto) from a LLDD, and enqueues 6061da177e4SLinus Torvalds * the command to the done queue for further processing. 6071da177e4SLinus Torvalds * 6081da177e4SLinus Torvalds * This is the producer of the done queue who enqueues at the tail. 6091da177e4SLinus Torvalds * 6101da177e4SLinus Torvalds * This function is interrupt context safe. 6111da177e4SLinus Torvalds */ 61252c1da39SAdrian Bunk static void scsi_done(struct scsi_cmnd *cmd) 6131da177e4SLinus Torvalds { 6141da177e4SLinus Torvalds /* 6151da177e4SLinus Torvalds * We don't have to worry about this one timing out any more. 6161da177e4SLinus Torvalds * If we are unable to remove the timer, then the command 6171da177e4SLinus Torvalds * has already timed out. In which case, we have no choice but to 6181da177e4SLinus Torvalds * let the timeout function run, as we have no idea where in fact 6191da177e4SLinus Torvalds * that function could really be. It might be on another processor, 6201da177e4SLinus Torvalds * etc, etc. 6211da177e4SLinus Torvalds */ 6221da177e4SLinus Torvalds if (!scsi_delete_timer(cmd)) 6231da177e4SLinus Torvalds return; 6241da177e4SLinus Torvalds __scsi_done(cmd); 6251da177e4SLinus Torvalds } 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvalds /* Private entry to scsi_done() to complete a command when the timer 6281da177e4SLinus Torvalds * isn't running --- used by scsi_times_out */ 6291da177e4SLinus Torvalds void __scsi_done(struct scsi_cmnd *cmd) 6301da177e4SLinus Torvalds { 6311aea6434SJens Axboe struct request *rq = cmd->request; 6321da177e4SLinus Torvalds 6331da177e4SLinus Torvalds /* 6341da177e4SLinus Torvalds * Set the serial numbers back to zero 6351da177e4SLinus Torvalds */ 6361da177e4SLinus Torvalds cmd->serial_number = 0; 6371da177e4SLinus Torvalds 6381da177e4SLinus Torvalds atomic_inc(&cmd->device->iodone_cnt); 6391da177e4SLinus Torvalds if (cmd->result) 6401da177e4SLinus Torvalds atomic_inc(&cmd->device->ioerr_cnt); 6411da177e4SLinus Torvalds 6421aea6434SJens Axboe BUG_ON(!rq); 6431aea6434SJens Axboe 6441da177e4SLinus Torvalds /* 6451aea6434SJens Axboe * The uptodate/nbytes values don't matter, as we allow partial 6461aea6434SJens Axboe * completes and thus will check this in the softirq callback 6471da177e4SLinus Torvalds */ 6481aea6434SJens Axboe rq->completion_data = cmd; 6491aea6434SJens Axboe blk_complete_request(rq); 6501da177e4SLinus Torvalds } 6511da177e4SLinus Torvalds 6521da177e4SLinus Torvalds /* 6531da177e4SLinus Torvalds * Function: scsi_retry_command 6541da177e4SLinus Torvalds * 6551da177e4SLinus Torvalds * Purpose: Send a command back to the low level to be retried. 6561da177e4SLinus Torvalds * 6571da177e4SLinus Torvalds * Notes: This command is always executed in the context of the 6581da177e4SLinus Torvalds * bottom half handler, or the error handler thread. Low 6591da177e4SLinus Torvalds * level drivers should not become re-entrant as a result of 6601da177e4SLinus Torvalds * this. 6611da177e4SLinus Torvalds */ 6621aea6434SJens Axboe int scsi_retry_command(struct scsi_cmnd *cmd) 6631da177e4SLinus Torvalds { 6641da177e4SLinus Torvalds /* 6651da177e4SLinus Torvalds * Zero the sense information from the last time we tried 6661da177e4SLinus Torvalds * this command. 6671da177e4SLinus Torvalds */ 6681da177e4SLinus Torvalds memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer)); 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvalds return scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY); 6711da177e4SLinus Torvalds } 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvalds /* 6741da177e4SLinus Torvalds * Function: scsi_finish_command 6751da177e4SLinus Torvalds * 6761da177e4SLinus Torvalds * Purpose: Pass command off to upper layer for finishing of I/O 6771da177e4SLinus Torvalds * request, waking processes that are waiting on results, 6781da177e4SLinus Torvalds * etc. 6791da177e4SLinus Torvalds */ 6801da177e4SLinus Torvalds void scsi_finish_command(struct scsi_cmnd *cmd) 6811da177e4SLinus Torvalds { 6821da177e4SLinus Torvalds struct scsi_device *sdev = cmd->device; 6831da177e4SLinus Torvalds struct Scsi_Host *shost = sdev->host; 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvalds scsi_device_unbusy(sdev); 6861da177e4SLinus Torvalds 6871da177e4SLinus Torvalds /* 6881da177e4SLinus Torvalds * Clear the flags which say that the device/host is no longer 6891da177e4SLinus Torvalds * capable of accepting new commands. These are set in scsi_queue.c 6901da177e4SLinus Torvalds * for both the queue full condition on a device, and for a 6911da177e4SLinus Torvalds * host full condition on the host. 6921da177e4SLinus Torvalds * 6931da177e4SLinus Torvalds * XXX(hch): What about locking? 6941da177e4SLinus Torvalds */ 6951da177e4SLinus Torvalds shost->host_blocked = 0; 6961da177e4SLinus Torvalds sdev->device_blocked = 0; 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvalds /* 6991da177e4SLinus Torvalds * If we have valid sense information, then some kind of recovery 7001da177e4SLinus Torvalds * must have taken place. Make a note of this. 7011da177e4SLinus Torvalds */ 7021da177e4SLinus Torvalds if (SCSI_SENSE_VALID(cmd)) 7031da177e4SLinus Torvalds cmd->result |= (DRIVER_SENSE << 24); 7041da177e4SLinus Torvalds 7053bf743e7SJeff Garzik SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, 7063bf743e7SJeff Garzik "Notifying upper driver of completion " 7073bf743e7SJeff Garzik "(result %x)\n", cmd->result)); 7081da177e4SLinus Torvalds 7091da177e4SLinus Torvalds cmd->done(cmd); 7101da177e4SLinus Torvalds } 7111da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_finish_command); 7121da177e4SLinus Torvalds 7131da177e4SLinus Torvalds /* 7141da177e4SLinus Torvalds * Function: scsi_adjust_queue_depth() 7151da177e4SLinus Torvalds * 7161da177e4SLinus Torvalds * Purpose: Allow low level drivers to tell us to change the queue depth 7171da177e4SLinus Torvalds * on a specific SCSI device 7181da177e4SLinus Torvalds * 7191da177e4SLinus Torvalds * Arguments: sdev - SCSI Device in question 7201da177e4SLinus Torvalds * tagged - Do we use tagged queueing (non-0) or do we treat 7211da177e4SLinus Torvalds * this device as an untagged device (0) 7221da177e4SLinus Torvalds * tags - Number of tags allowed if tagged queueing enabled, 7231da177e4SLinus Torvalds * or number of commands the low level driver can 7241da177e4SLinus Torvalds * queue up in non-tagged mode (as per cmd_per_lun). 7251da177e4SLinus Torvalds * 7261da177e4SLinus Torvalds * Returns: Nothing 7271da177e4SLinus Torvalds * 7281da177e4SLinus Torvalds * Lock Status: None held on entry 7291da177e4SLinus Torvalds * 7301da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 7311da177e4SLinus Torvalds * the right thing depending on whether or not the device is 7321da177e4SLinus Torvalds * currently active and whether or not it even has the 7331da177e4SLinus Torvalds * command blocks built yet. 7341da177e4SLinus Torvalds */ 7351da177e4SLinus Torvalds void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) 7361da177e4SLinus Torvalds { 7371da177e4SLinus Torvalds unsigned long flags; 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvalds /* 7401da177e4SLinus Torvalds * refuse to set tagged depth to an unworkable size 7411da177e4SLinus Torvalds */ 7421da177e4SLinus Torvalds if (tags <= 0) 7431da177e4SLinus Torvalds return; 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvalds spin_lock_irqsave(sdev->request_queue->queue_lock, flags); 7461da177e4SLinus Torvalds 7471da177e4SLinus Torvalds /* Check to see if the queue is managed by the block layer 7481da177e4SLinus Torvalds * if it is, and we fail to adjust the depth, exit */ 7491da177e4SLinus Torvalds if (blk_queue_tagged(sdev->request_queue) && 7501da177e4SLinus Torvalds blk_queue_resize_tags(sdev->request_queue, tags) != 0) 7511da177e4SLinus Torvalds goto out; 7521da177e4SLinus Torvalds 7531da177e4SLinus Torvalds sdev->queue_depth = tags; 7541da177e4SLinus Torvalds switch (tagged) { 7551da177e4SLinus Torvalds case MSG_ORDERED_TAG: 7561da177e4SLinus Torvalds sdev->ordered_tags = 1; 7571da177e4SLinus Torvalds sdev->simple_tags = 1; 7581da177e4SLinus Torvalds break; 7591da177e4SLinus Torvalds case MSG_SIMPLE_TAG: 7601da177e4SLinus Torvalds sdev->ordered_tags = 0; 7611da177e4SLinus Torvalds sdev->simple_tags = 1; 7621da177e4SLinus Torvalds break; 7631da177e4SLinus Torvalds default: 7649ccfc756SJames Bottomley sdev_printk(KERN_WARNING, sdev, 7651da177e4SLinus Torvalds "scsi_adjust_queue_depth, bad queue type, " 7669ccfc756SJames Bottomley "disabled\n"); 7671da177e4SLinus Torvalds case 0: 7681da177e4SLinus Torvalds sdev->ordered_tags = sdev->simple_tags = 0; 7691da177e4SLinus Torvalds sdev->queue_depth = tags; 7701da177e4SLinus Torvalds break; 7711da177e4SLinus Torvalds } 7721da177e4SLinus Torvalds out: 7731da177e4SLinus Torvalds spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); 7741da177e4SLinus Torvalds } 7751da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_adjust_queue_depth); 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvalds /* 7781da177e4SLinus Torvalds * Function: scsi_track_queue_full() 7791da177e4SLinus Torvalds * 7801da177e4SLinus Torvalds * Purpose: This function will track successive QUEUE_FULL events on a 7811da177e4SLinus Torvalds * specific SCSI device to determine if and when there is a 7821da177e4SLinus Torvalds * need to adjust the queue depth on the device. 7831da177e4SLinus Torvalds * 7841da177e4SLinus Torvalds * Arguments: sdev - SCSI Device in question 7851da177e4SLinus Torvalds * depth - Current number of outstanding SCSI commands on 7861da177e4SLinus Torvalds * this device, not counting the one returned as 7871da177e4SLinus Torvalds * QUEUE_FULL. 7881da177e4SLinus Torvalds * 7891da177e4SLinus Torvalds * Returns: 0 - No change needed 7901da177e4SLinus Torvalds * >0 - Adjust queue depth to this new depth 7911da177e4SLinus Torvalds * -1 - Drop back to untagged operation using host->cmd_per_lun 7921da177e4SLinus Torvalds * as the untagged command depth 7931da177e4SLinus Torvalds * 7941da177e4SLinus Torvalds * Lock Status: None held on entry 7951da177e4SLinus Torvalds * 7961da177e4SLinus Torvalds * Notes: Low level drivers may call this at any time and we will do 7971da177e4SLinus Torvalds * "The Right Thing." We are interrupt context safe. 7981da177e4SLinus Torvalds */ 7991da177e4SLinus Torvalds int scsi_track_queue_full(struct scsi_device *sdev, int depth) 8001da177e4SLinus Torvalds { 8011da177e4SLinus Torvalds if ((jiffies >> 4) == sdev->last_queue_full_time) 8021da177e4SLinus Torvalds return 0; 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvalds sdev->last_queue_full_time = (jiffies >> 4); 8051da177e4SLinus Torvalds if (sdev->last_queue_full_depth != depth) { 8061da177e4SLinus Torvalds sdev->last_queue_full_count = 1; 8071da177e4SLinus Torvalds sdev->last_queue_full_depth = depth; 8081da177e4SLinus Torvalds } else { 8091da177e4SLinus Torvalds sdev->last_queue_full_count++; 8101da177e4SLinus Torvalds } 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds if (sdev->last_queue_full_count <= 10) 8131da177e4SLinus Torvalds return 0; 8141da177e4SLinus Torvalds if (sdev->last_queue_full_depth < 8) { 8151da177e4SLinus Torvalds /* Drop back to untagged */ 8161da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); 8171da177e4SLinus Torvalds return -1; 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 8201da177e4SLinus Torvalds if (sdev->ordered_tags) 8211da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth); 8221da177e4SLinus Torvalds else 8231da177e4SLinus Torvalds scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); 8241da177e4SLinus Torvalds return depth; 8251da177e4SLinus Torvalds } 8261da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_track_queue_full); 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvalds /** 8291da177e4SLinus Torvalds * scsi_device_get - get an addition reference to a scsi_device 8301da177e4SLinus Torvalds * @sdev: device to get a reference to 8311da177e4SLinus Torvalds * 8321da177e4SLinus Torvalds * Gets a reference to the scsi_device and increments the use count 8331da177e4SLinus Torvalds * of the underlying LLDD module. You must hold host_lock of the 8341da177e4SLinus Torvalds * parent Scsi_Host or already have a reference when calling this. 8351da177e4SLinus Torvalds */ 8361da177e4SLinus Torvalds int scsi_device_get(struct scsi_device *sdev) 8371da177e4SLinus Torvalds { 8381da177e4SLinus Torvalds if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL) 8391da177e4SLinus Torvalds return -ENXIO; 8401da177e4SLinus Torvalds if (!get_device(&sdev->sdev_gendev)) 8411da177e4SLinus Torvalds return -ENXIO; 8421da177e4SLinus Torvalds if (!try_module_get(sdev->host->hostt->module)) { 8431da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 8441da177e4SLinus Torvalds return -ENXIO; 8451da177e4SLinus Torvalds } 8461da177e4SLinus Torvalds return 0; 8471da177e4SLinus Torvalds } 8481da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_get); 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvalds /** 8511da177e4SLinus Torvalds * scsi_device_put - release a reference to a scsi_device 8521da177e4SLinus Torvalds * @sdev: device to release a reference on. 8531da177e4SLinus Torvalds * 8541da177e4SLinus Torvalds * Release a reference to the scsi_device and decrements the use count 8551da177e4SLinus Torvalds * of the underlying LLDD module. The device is freed once the last 8561da177e4SLinus Torvalds * user vanishes. 8571da177e4SLinus Torvalds */ 8581da177e4SLinus Torvalds void scsi_device_put(struct scsi_device *sdev) 8591da177e4SLinus Torvalds { 8601da177e4SLinus Torvalds module_put(sdev->host->hostt->module); 8611da177e4SLinus Torvalds put_device(&sdev->sdev_gendev); 8621da177e4SLinus Torvalds } 8631da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_put); 8641da177e4SLinus Torvalds 8651da177e4SLinus Torvalds /* helper for shost_for_each_device, thus not documented */ 8661da177e4SLinus Torvalds struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, 8671da177e4SLinus Torvalds struct scsi_device *prev) 8681da177e4SLinus Torvalds { 8691da177e4SLinus Torvalds struct list_head *list = (prev ? &prev->siblings : &shost->__devices); 8701da177e4SLinus Torvalds struct scsi_device *next = NULL; 8711da177e4SLinus Torvalds unsigned long flags; 8721da177e4SLinus Torvalds 8731da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 8741da177e4SLinus Torvalds while (list->next != &shost->__devices) { 8751da177e4SLinus Torvalds next = list_entry(list->next, struct scsi_device, siblings); 8761da177e4SLinus Torvalds /* skip devices that we can't get a reference to */ 8771da177e4SLinus Torvalds if (!scsi_device_get(next)) 8781da177e4SLinus Torvalds break; 8791da177e4SLinus Torvalds next = NULL; 8801da177e4SLinus Torvalds list = list->next; 8811da177e4SLinus Torvalds } 8821da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds if (prev) 8851da177e4SLinus Torvalds scsi_device_put(prev); 8861da177e4SLinus Torvalds return next; 8871da177e4SLinus Torvalds } 8881da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_iterate_devices); 8891da177e4SLinus Torvalds 8901da177e4SLinus Torvalds /** 8911da177e4SLinus Torvalds * starget_for_each_device - helper to walk all devices of a target 8921da177e4SLinus Torvalds * @starget: target whose devices we want to iterate over. 8931da177e4SLinus Torvalds * 8941da177e4SLinus Torvalds * This traverses over each devices of @shost. The devices have 8951da177e4SLinus Torvalds * a reference that must be released by scsi_host_put when breaking 8961da177e4SLinus Torvalds * out of the loop. 8971da177e4SLinus Torvalds */ 8981da177e4SLinus Torvalds void starget_for_each_device(struct scsi_target *starget, void * data, 8991da177e4SLinus Torvalds void (*fn)(struct scsi_device *, void *)) 9001da177e4SLinus Torvalds { 9011da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 9021da177e4SLinus Torvalds struct scsi_device *sdev; 9031da177e4SLinus Torvalds 9041da177e4SLinus Torvalds shost_for_each_device(sdev, shost) { 9051da177e4SLinus Torvalds if ((sdev->channel == starget->channel) && 9061da177e4SLinus Torvalds (sdev->id == starget->id)) 9071da177e4SLinus Torvalds fn(sdev, data); 9081da177e4SLinus Torvalds } 9091da177e4SLinus Torvalds } 9101da177e4SLinus Torvalds EXPORT_SYMBOL(starget_for_each_device); 9111da177e4SLinus Torvalds 9121da177e4SLinus Torvalds /** 9131da177e4SLinus Torvalds * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) 9141da177e4SLinus Torvalds * @starget: SCSI target pointer 9151da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 9161da177e4SLinus Torvalds * 9171da177e4SLinus Torvalds * Looks up the scsi_device with the specified @lun for a give 9181da177e4SLinus Torvalds * @starget. The returned scsi_device does not have an additional 9191da177e4SLinus Torvalds * reference. You must hold the host's host_lock over this call and 9201da177e4SLinus Torvalds * any access to the returned scsi_device. 9211da177e4SLinus Torvalds * 9221da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 9231da177e4SLinus Torvalds * they're need to access the device list in irq context. Otherwise you 9241da177e4SLinus Torvalds * really want to use scsi_device_lookup_by_target instead. 9251da177e4SLinus Torvalds **/ 9261da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, 9271da177e4SLinus Torvalds uint lun) 9281da177e4SLinus Torvalds { 9291da177e4SLinus Torvalds struct scsi_device *sdev; 9301da177e4SLinus Torvalds 9311da177e4SLinus Torvalds list_for_each_entry(sdev, &starget->devices, same_target_siblings) { 9321da177e4SLinus Torvalds if (sdev->lun ==lun) 9331da177e4SLinus Torvalds return sdev; 9341da177e4SLinus Torvalds } 9351da177e4SLinus Torvalds 9361da177e4SLinus Torvalds return NULL; 9371da177e4SLinus Torvalds } 9381da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup_by_target); 9391da177e4SLinus Torvalds 9401da177e4SLinus Torvalds /** 9411da177e4SLinus Torvalds * scsi_device_lookup_by_target - find a device given the target 9421da177e4SLinus Torvalds * @starget: SCSI target pointer 9431da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 9441da177e4SLinus Torvalds * 9451da177e4SLinus Torvalds * Looks up the scsi_device with the specified @channel, @id, @lun for a 9461da177e4SLinus Torvalds * give host. The returned scsi_device has an additional reference that 9471da177e4SLinus Torvalds * needs to be release with scsi_host_put once you're done with it. 9481da177e4SLinus Torvalds **/ 9491da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, 9501da177e4SLinus Torvalds uint lun) 9511da177e4SLinus Torvalds { 9521da177e4SLinus Torvalds struct scsi_device *sdev; 9531da177e4SLinus Torvalds struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 9541da177e4SLinus Torvalds unsigned long flags; 9551da177e4SLinus Torvalds 9561da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 9571da177e4SLinus Torvalds sdev = __scsi_device_lookup_by_target(starget, lun); 9581da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 9591da177e4SLinus Torvalds sdev = NULL; 9601da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 9611da177e4SLinus Torvalds 9621da177e4SLinus Torvalds return sdev; 9631da177e4SLinus Torvalds } 9641da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup_by_target); 9651da177e4SLinus Torvalds 9661da177e4SLinus Torvalds /** 9671da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host (UNLOCKED) 9681da177e4SLinus Torvalds * @shost: SCSI host pointer 9691da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 9701da177e4SLinus Torvalds * @pun: SCSI target number (physical unit number) 9711da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 9721da177e4SLinus Torvalds * 9731da177e4SLinus Torvalds * Looks up the scsi_device with the specified @channel, @id, @lun for a 9741da177e4SLinus Torvalds * give host. The returned scsi_device does not have an additional reference. 9751da177e4SLinus Torvalds * You must hold the host's host_lock over this call and any access to the 9761da177e4SLinus Torvalds * returned scsi_device. 9771da177e4SLinus Torvalds * 9781da177e4SLinus Torvalds * Note: The only reason why drivers would want to use this is because 9791da177e4SLinus Torvalds * they're need to access the device list in irq context. Otherwise you 9801da177e4SLinus Torvalds * really want to use scsi_device_lookup instead. 9811da177e4SLinus Torvalds **/ 9821da177e4SLinus Torvalds struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, 9831da177e4SLinus Torvalds uint channel, uint id, uint lun) 9841da177e4SLinus Torvalds { 9851da177e4SLinus Torvalds struct scsi_device *sdev; 9861da177e4SLinus Torvalds 9871da177e4SLinus Torvalds list_for_each_entry(sdev, &shost->__devices, siblings) { 9881da177e4SLinus Torvalds if (sdev->channel == channel && sdev->id == id && 9891da177e4SLinus Torvalds sdev->lun ==lun) 9901da177e4SLinus Torvalds return sdev; 9911da177e4SLinus Torvalds } 9921da177e4SLinus Torvalds 9931da177e4SLinus Torvalds return NULL; 9941da177e4SLinus Torvalds } 9951da177e4SLinus Torvalds EXPORT_SYMBOL(__scsi_device_lookup); 9961da177e4SLinus Torvalds 9971da177e4SLinus Torvalds /** 9981da177e4SLinus Torvalds * scsi_device_lookup - find a device given the host 9991da177e4SLinus Torvalds * @shost: SCSI host pointer 10001da177e4SLinus Torvalds * @channel: SCSI channel (zero if only one channel) 10011da177e4SLinus Torvalds * @id: SCSI target number (physical unit number) 10021da177e4SLinus Torvalds * @lun: SCSI Logical Unit Number 10031da177e4SLinus Torvalds * 10041da177e4SLinus Torvalds * Looks up the scsi_device with the specified @channel, @id, @lun for a 10051da177e4SLinus Torvalds * give host. The returned scsi_device has an additional reference that 10061da177e4SLinus Torvalds * needs to be release with scsi_host_put once you're done with it. 10071da177e4SLinus Torvalds **/ 10081da177e4SLinus Torvalds struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, 10091da177e4SLinus Torvalds uint channel, uint id, uint lun) 10101da177e4SLinus Torvalds { 10111da177e4SLinus Torvalds struct scsi_device *sdev; 10121da177e4SLinus Torvalds unsigned long flags; 10131da177e4SLinus Torvalds 10141da177e4SLinus Torvalds spin_lock_irqsave(shost->host_lock, flags); 10151da177e4SLinus Torvalds sdev = __scsi_device_lookup(shost, channel, id, lun); 10161da177e4SLinus Torvalds if (sdev && scsi_device_get(sdev)) 10171da177e4SLinus Torvalds sdev = NULL; 10181da177e4SLinus Torvalds spin_unlock_irqrestore(shost->host_lock, flags); 10191da177e4SLinus Torvalds 10201da177e4SLinus Torvalds return sdev; 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_lookup); 10231da177e4SLinus Torvalds 10241da177e4SLinus Torvalds /** 10251da177e4SLinus Torvalds * scsi_device_cancel - cancel outstanding IO to this device 10261da177e4SLinus Torvalds * @sdev: Pointer to struct scsi_device 10271da177e4SLinus Torvalds * @recovery: Boolean instructing function to recover device or not. 10281da177e4SLinus Torvalds * 10291da177e4SLinus Torvalds **/ 10301da177e4SLinus Torvalds int scsi_device_cancel(struct scsi_device *sdev, int recovery) 10311da177e4SLinus Torvalds { 10321da177e4SLinus Torvalds struct scsi_cmnd *scmd; 10331da177e4SLinus Torvalds LIST_HEAD(active_list); 10341da177e4SLinus Torvalds struct list_head *lh, *lh_sf; 10351da177e4SLinus Torvalds unsigned long flags; 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds scsi_device_set_state(sdev, SDEV_CANCEL); 10381da177e4SLinus Torvalds 10391da177e4SLinus Torvalds spin_lock_irqsave(&sdev->list_lock, flags); 10401da177e4SLinus Torvalds list_for_each_entry(scmd, &sdev->cmd_list, list) { 10411da177e4SLinus Torvalds if (scmd->request && scmd->request->rq_status != RQ_INACTIVE) { 10421da177e4SLinus Torvalds /* 10431da177e4SLinus Torvalds * If we are unable to remove the timer, it means 10441da177e4SLinus Torvalds * that the command has already timed out or 10451da177e4SLinus Torvalds * finished. 10461da177e4SLinus Torvalds */ 10471da177e4SLinus Torvalds if (!scsi_delete_timer(scmd)) 10481da177e4SLinus Torvalds continue; 10491da177e4SLinus Torvalds list_add_tail(&scmd->eh_entry, &active_list); 10501da177e4SLinus Torvalds } 10511da177e4SLinus Torvalds } 10521da177e4SLinus Torvalds spin_unlock_irqrestore(&sdev->list_lock, flags); 10531da177e4SLinus Torvalds 10541da177e4SLinus Torvalds if (!list_empty(&active_list)) { 10551da177e4SLinus Torvalds list_for_each_safe(lh, lh_sf, &active_list) { 10561da177e4SLinus Torvalds scmd = list_entry(lh, struct scsi_cmnd, eh_entry); 10571da177e4SLinus Torvalds list_del_init(lh); 1058939647eeSJames Bottomley if (recovery && 1059939647eeSJames Bottomley !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) { 10601da177e4SLinus Torvalds scmd->result = (DID_ABORT << 16); 10611da177e4SLinus Torvalds scsi_finish_command(scmd); 10621da177e4SLinus Torvalds } 10631da177e4SLinus Torvalds } 10641da177e4SLinus Torvalds } 10651da177e4SLinus Torvalds 10661da177e4SLinus Torvalds return 0; 10671da177e4SLinus Torvalds } 10681da177e4SLinus Torvalds EXPORT_SYMBOL(scsi_device_cancel); 10691da177e4SLinus Torvalds 10701da177e4SLinus Torvalds MODULE_DESCRIPTION("SCSI core"); 10711da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 10721da177e4SLinus Torvalds 10731da177e4SLinus Torvalds module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); 10741da177e4SLinus Torvalds MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); 10751da177e4SLinus Torvalds 10761da177e4SLinus Torvalds static int __init init_scsi(void) 10771da177e4SLinus Torvalds { 10781da177e4SLinus Torvalds int error, i; 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds error = scsi_init_queue(); 10811da177e4SLinus Torvalds if (error) 10821da177e4SLinus Torvalds return error; 10831da177e4SLinus Torvalds error = scsi_init_procfs(); 10841da177e4SLinus Torvalds if (error) 10851da177e4SLinus Torvalds goto cleanup_queue; 10861da177e4SLinus Torvalds error = scsi_init_devinfo(); 10871da177e4SLinus Torvalds if (error) 10881da177e4SLinus Torvalds goto cleanup_procfs; 10891da177e4SLinus Torvalds error = scsi_init_hosts(); 10901da177e4SLinus Torvalds if (error) 10911da177e4SLinus Torvalds goto cleanup_devlist; 10921da177e4SLinus Torvalds error = scsi_init_sysctl(); 10931da177e4SLinus Torvalds if (error) 10941da177e4SLinus Torvalds goto cleanup_hosts; 10951da177e4SLinus Torvalds error = scsi_sysfs_register(); 10961da177e4SLinus Torvalds if (error) 10971da177e4SLinus Torvalds goto cleanup_sysctl; 10981da177e4SLinus Torvalds 1099530bba6fSKAMEZAWA Hiroyuki for_each_possible_cpu(i) 11001da177e4SLinus Torvalds INIT_LIST_HEAD(&per_cpu(scsi_done_q, i)); 11011da177e4SLinus Torvalds 11021da177e4SLinus Torvalds printk(KERN_NOTICE "SCSI subsystem initialized\n"); 11031da177e4SLinus Torvalds return 0; 11041da177e4SLinus Torvalds 11051da177e4SLinus Torvalds cleanup_sysctl: 11061da177e4SLinus Torvalds scsi_exit_sysctl(); 11071da177e4SLinus Torvalds cleanup_hosts: 11081da177e4SLinus Torvalds scsi_exit_hosts(); 11091da177e4SLinus Torvalds cleanup_devlist: 11101da177e4SLinus Torvalds scsi_exit_devinfo(); 11111da177e4SLinus Torvalds cleanup_procfs: 11121da177e4SLinus Torvalds scsi_exit_procfs(); 11131da177e4SLinus Torvalds cleanup_queue: 11141da177e4SLinus Torvalds scsi_exit_queue(); 11151da177e4SLinus Torvalds printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", 11161da177e4SLinus Torvalds -error); 11171da177e4SLinus Torvalds return error; 11181da177e4SLinus Torvalds } 11191da177e4SLinus Torvalds 11201da177e4SLinus Torvalds static void __exit exit_scsi(void) 11211da177e4SLinus Torvalds { 11221da177e4SLinus Torvalds scsi_sysfs_unregister(); 11231da177e4SLinus Torvalds scsi_exit_sysctl(); 11241da177e4SLinus Torvalds scsi_exit_hosts(); 11251da177e4SLinus Torvalds scsi_exit_devinfo(); 11261da177e4SLinus Torvalds scsi_exit_procfs(); 11271da177e4SLinus Torvalds scsi_exit_queue(); 11281da177e4SLinus Torvalds } 11291da177e4SLinus Torvalds 11301da177e4SLinus Torvalds subsys_initcall(init_scsi); 11311da177e4SLinus Torvalds module_exit(exit_scsi); 1132