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drivers/scsi/scsi.c
33.6 KB
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/* * scsi.c Copyright (C) 1992 Drew Eckhardt * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale * Copyright (C) 2002, 2003 Christoph Hellwig * * generic mid-level SCSI driver * Initial versions: Drew Eckhardt * Subsequent revisions: Eric Youngdale * * <drew@colorado.edu> * * Bug correction thanks go to : * Rik Faith <faith@cs.unc.edu> * Tommy Thorn <tthorn> * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de> * * Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to * add scatter-gather, multiple outstanding request, and other * enhancements. * * Native multichannel, wide scsi, /proc/scsi and hot plugging * support added by Michael Neuffer <mike@i-connect.net> * * Added request_module("scsi_hostadapter") for kerneld: * (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf) * Bjorn Ekwall <bj0rn@blox.se> * (changed to kmod) * * Major improvements to the timeout, abort, and reset processing, * as well as performance modifications for large queue depths by * Leonard N. Zubkoff <lnz@dandelion.com> * * Converted cli() code to spinlocks, Ingo Molnar * * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli * * out_of_space hacks, D. Gilbert (dpg) 990608 */ #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/kernel.h> |
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#include <linux/timer.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/completion.h> |
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#include <linux/unistd.h> #include <linux/spinlock.h> #include <linux/kmod.h> #include <linux/interrupt.h> #include <linux/notifier.h> #include <linux/cpu.h> |
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#include <linux/mutex.h> |
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#include <linux/async.h> |
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#include <asm/unaligned.h> |
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#include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_dbg.h> #include <scsi/scsi_device.h> |
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#include <scsi/scsi_driver.h> |
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#include <scsi/scsi_eh.h> #include <scsi/scsi_host.h> #include <scsi/scsi_tcq.h> |
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#include "scsi_priv.h" #include "scsi_logging.h" |
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#define CREATE_TRACE_POINTS #include <trace/events/scsi.h> |
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/* * Definitions and constants. */ |
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/* |
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* Note - the initial logging level can be set here to log events at boot time. * After the system is up, you may enable logging via the /proc interface. */ unsigned int scsi_logging_level; #if defined(CONFIG_SCSI_LOGGING) EXPORT_SYMBOL(scsi_logging_level); #endif |
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/* sd, scsi core and power management need to coordinate flushing async actions */ |
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ASYNC_DOMAIN(scsi_sd_probe_domain); |
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EXPORT_SYMBOL(scsi_sd_probe_domain); |
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|
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/* * Separate domain (from scsi_sd_probe_domain) to maximize the benefit of * asynchronous system resume operations. It is marked 'exclusive' to avoid * being included in the async_synchronize_full() that is invoked by * dpm_resume() */ ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain); EXPORT_SYMBOL(scsi_sd_pm_domain); |
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/* NB: These are exposed through /proc/scsi/scsi and form part of the ABI. * You may not alter any existing entry (although adding new ones is * encouraged once assigned by ANSI/INCITS T10 */ |
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static const char *const scsi_device_types[] = { |
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"Direct-Access ", "Sequential-Access", |
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"Printer ", "Processor ", "WORM ", |
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"CD-ROM ", |
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"Scanner ", |
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"Optical Device ", "Medium Changer ", |
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"Communications ", |
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"ASC IT8 ", "ASC IT8 ", |
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"RAID ", "Enclosure ", |
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"Direct-Access-RBC", |
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"Optical card ", "Bridge controller", "Object storage ", "Automation/Drive ", |
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"Security Manager ", "Direct-Access-ZBC", |
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}; |
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/** * scsi_device_type - Return 17 char string indicating device type. * @type: type number to look up */ |
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const char * scsi_device_type(unsigned type) { if (type == 0x1e) return "Well-known LUN "; if (type == 0x1f) return "No Device "; |
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if (type >= ARRAY_SIZE(scsi_device_types)) |
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return "Unknown "; return scsi_device_types[type]; } EXPORT_SYMBOL(scsi_device_type); |
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|
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struct scsi_host_cmd_pool { |
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struct kmem_cache *cmd_slab; struct kmem_cache *sense_slab; unsigned int users; char *cmd_name; char *sense_name; unsigned int slab_flags; gfp_t gfp_mask; |
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}; static struct scsi_host_cmd_pool scsi_cmd_pool = { |
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.cmd_name = "scsi_cmd_cache", .sense_name = "scsi_sense_cache", |
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.slab_flags = SLAB_HWCACHE_ALIGN, }; static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { |
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.cmd_name = "scsi_cmd_cache(DMA)", .sense_name = "scsi_sense_cache(DMA)", |
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.slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, .gfp_mask = __GFP_DMA, }; |
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static DEFINE_MUTEX(host_cmd_pool_mutex); |
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|
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/** |
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* scsi_host_free_command - internal function to release a command * @shost: host to free the command for |
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* @cmd: command to release * * the command must previously have been allocated by |
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* scsi_host_alloc_command. |
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*/ static void |
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scsi_host_free_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
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{ |
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struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
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if (cmd->prot_sdb) kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb); |
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kmem_cache_free(pool->sense_slab, cmd->sense_buffer); kmem_cache_free(pool->cmd_slab, cmd); } /** |
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* scsi_host_alloc_command - internal function to allocate command * @shost: SCSI host whose pool to allocate from * @gfp_mask: mask for the allocation * * Returns a fully allocated command with sense buffer and protection * data buffer (where applicable) or NULL on failure */ static struct scsi_cmnd * scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask) { |
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struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
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struct scsi_cmnd *cmd; |
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cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask | pool->gfp_mask); |
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if (!cmd) |
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goto fail; cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab, gfp_mask | pool->gfp_mask); if (!cmd->sense_buffer) goto fail_free_cmd; |
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if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) { cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask); |
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if (!cmd->prot_sdb) goto fail_free_sense; |
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} return cmd; |
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fail_free_sense: kmem_cache_free(pool->sense_slab, cmd->sense_buffer); fail_free_cmd: kmem_cache_free(pool->cmd_slab, cmd); fail: return NULL; |
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} /** |
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* __scsi_get_command - Allocate a struct scsi_cmnd * @shost: host to transmit command * @gfp_mask: allocation mask * * Description: allocate a struct scsi_cmd from host's slab, recycling from the * host's free_list if necessary. */ |
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static struct scsi_cmnd * __scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask) |
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{ |
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struct scsi_cmnd *cmd = scsi_host_alloc_command(shost, gfp_mask); |
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if (unlikely(!cmd)) { unsigned long flags; spin_lock_irqsave(&shost->free_list_lock, flags); if (likely(!list_empty(&shost->free_list))) { cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); list_del_init(&cmd->list); } spin_unlock_irqrestore(&shost->free_list_lock, flags); |
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if (cmd) { |
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void *buf, *prot; |
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buf = cmd->sense_buffer; |
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prot = cmd->prot_sdb; |
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memset(cmd, 0, sizeof(*cmd)); |
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cmd->sense_buffer = buf; |
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cmd->prot_sdb = prot; |
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} |
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} return cmd; } |
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/** * scsi_get_command - Allocate and setup a scsi command block * @dev: parent scsi device * @gfp_mask: allocator flags |
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* * Returns: The allocated scsi command structure. */ |
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struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) |
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{ |
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struct scsi_cmnd *cmd = __scsi_get_command(dev->host, gfp_mask); unsigned long flags; |
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if (unlikely(cmd == NULL)) |
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return NULL; |
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cmd->device = dev; INIT_LIST_HEAD(&cmd->list); INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); spin_lock_irqsave(&dev->list_lock, flags); list_add_tail(&cmd->list, &dev->cmd_list); spin_unlock_irqrestore(&dev->list_lock, flags); cmd->jiffies_at_alloc = jiffies; |
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return cmd; |
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} |
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/** * __scsi_put_command - Free a struct scsi_cmnd * @shost: dev->host * @cmd: Command to free |
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*/ |
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static void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
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{ unsigned long flags; |
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if (unlikely(list_empty(&shost->free_list))) { |
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spin_lock_irqsave(&shost->free_list_lock, flags); if (list_empty(&shost->free_list)) { list_add(&cmd->list, &shost->free_list); cmd = NULL; } spin_unlock_irqrestore(&shost->free_list_lock, flags); |
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} |
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if (likely(cmd != NULL)) |
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scsi_host_free_command(shost, cmd); |
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} |
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|
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/** * scsi_put_command - Free a scsi command block * @cmd: command block to free |
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* * Returns: Nothing. * * Notes: The command must not belong to any lists. */ void scsi_put_command(struct scsi_cmnd *cmd) { |
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unsigned long flags; |
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|
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/* serious error if the command hasn't come from a device list */ spin_lock_irqsave(&cmd->device->list_lock, flags); BUG_ON(list_empty(&cmd->list)); list_del_init(&cmd->list); |
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spin_unlock_irqrestore(&cmd->device->list_lock, flags); |
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BUG_ON(delayed_work_pending(&cmd->abort_work)); |
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__scsi_put_command(cmd->device->host, cmd); |
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} |
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static struct scsi_host_cmd_pool * scsi_find_host_cmd_pool(struct Scsi_Host *shost) |
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{ |
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if (shost->hostt->cmd_size) return shost->hostt->cmd_pool; if (shost->unchecked_isa_dma) return &scsi_cmd_dma_pool; return &scsi_cmd_pool; } static void scsi_free_host_cmd_pool(struct scsi_host_cmd_pool *pool) { kfree(pool->sense_name); kfree(pool->cmd_name); kfree(pool); } static struct scsi_host_cmd_pool * scsi_alloc_host_cmd_pool(struct Scsi_Host *shost) { struct scsi_host_template *hostt = shost->hostt; struct scsi_host_cmd_pool *pool; pool = kzalloc(sizeof(*pool), GFP_KERNEL); if (!pool) return NULL; |
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pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->proc_name); pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->proc_name); |
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if (!pool->cmd_name || !pool->sense_name) { scsi_free_host_cmd_pool(pool); return NULL; } pool->slab_flags = SLAB_HWCACHE_ALIGN; if (shost->unchecked_isa_dma) { pool->slab_flags |= SLAB_CACHE_DMA; pool->gfp_mask = __GFP_DMA; } |
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if (hostt->cmd_size) hostt->cmd_pool = pool; |
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return pool; } static struct scsi_host_cmd_pool * scsi_get_host_cmd_pool(struct Scsi_Host *shost) { struct scsi_host_template *hostt = shost->hostt; |
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struct scsi_host_cmd_pool *retval = NULL, *pool; |
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size_t cmd_size = sizeof(struct scsi_cmnd) + hostt->cmd_size; |
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/* * Select a command slab for this host and create it if not |
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* yet existent. |
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*/ |
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mutex_lock(&host_cmd_pool_mutex); |
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pool = scsi_find_host_cmd_pool(shost); if (!pool) { pool = scsi_alloc_host_cmd_pool(shost); if (!pool) goto out; } |
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if (!pool->users) { |
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pool->cmd_slab = kmem_cache_create(pool->cmd_name, cmd_size, 0, |
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pool->slab_flags, NULL); if (!pool->cmd_slab) |
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goto out_free_pool; |
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pool->sense_slab = kmem_cache_create(pool->sense_name, SCSI_SENSE_BUFFERSIZE, 0, pool->slab_flags, NULL); |
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if (!pool->sense_slab) goto out_free_slab; |
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} pool->users++; |
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retval = pool; |
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out: |
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mutex_unlock(&host_cmd_pool_mutex); |
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return retval; |
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out_free_slab: kmem_cache_destroy(pool->cmd_slab); out_free_pool: |
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if (hostt->cmd_size) { |
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scsi_free_host_cmd_pool(pool); |
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hostt->cmd_pool = NULL; } |
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goto out; |
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} |
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static void scsi_put_host_cmd_pool(struct Scsi_Host *shost) |
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{ |
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struct scsi_host_template *hostt = shost->hostt; |
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struct scsi_host_cmd_pool *pool; |
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|
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mutex_lock(&host_cmd_pool_mutex); |
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pool = scsi_find_host_cmd_pool(shost); |
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/* |
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* This may happen if a driver has a mismatched get and put * of the command pool; the driver should be implicated in * the stack trace |
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*/ |
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BUG_ON(pool->users == 0); |
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if (!--pool->users) { kmem_cache_destroy(pool->cmd_slab); kmem_cache_destroy(pool->sense_slab); |
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if (hostt->cmd_size) { |
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scsi_free_host_cmd_pool(pool); |
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hostt->cmd_pool = NULL; } |
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} |
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mutex_unlock(&host_cmd_pool_mutex); |
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} /** |
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* scsi_setup_command_freelist - Setup the command freelist for a scsi host. * @shost: host to allocate the freelist for. * * Description: The command freelist protects against system-wide out of memory * deadlock by preallocating one SCSI command structure for each host, so the * system can always write to a swap file on a device associated with that host. * * Returns: Nothing. */ int scsi_setup_command_freelist(struct Scsi_Host *shost) { |
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const gfp_t gfp_mask = shost->unchecked_isa_dma ? GFP_DMA : GFP_KERNEL; |
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struct scsi_cmnd *cmd; |
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spin_lock_init(&shost->free_list_lock); INIT_LIST_HEAD(&shost->free_list); |
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shost->cmd_pool = scsi_get_host_cmd_pool(shost); |
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if (!shost->cmd_pool) return -ENOMEM; /* * Get one backup command for this host. */ |
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cmd = scsi_host_alloc_command(shost, gfp_mask); |
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if (!cmd) { |
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scsi_put_host_cmd_pool(shost); |
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shost->cmd_pool = NULL; |
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return -ENOMEM; } list_add(&cmd->list, &shost->free_list); return 0; |
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} |
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/** * scsi_destroy_command_freelist - Release the command freelist for a scsi host. * @shost: host whose freelist is going to be destroyed |
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*/ void scsi_destroy_command_freelist(struct Scsi_Host *shost) { |
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/* * If cmd_pool is NULL the free list was not initialized, so * do not attempt to release resources. */ if (!shost->cmd_pool) return; |
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while (!list_empty(&shost->free_list)) { struct scsi_cmnd *cmd; cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); list_del_init(&cmd->list); |
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scsi_host_free_command(shost, cmd); |
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} |
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shost->cmd_pool = NULL; |
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scsi_put_host_cmd_pool(shost); |
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} |
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#ifdef CONFIG_SCSI_LOGGING void scsi_log_send(struct scsi_cmnd *cmd) { unsigned int level; |
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/* * If ML QUEUE log level is greater than or equal to: * * 1: nothing (match completion) * |
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* 2: log opcode + command of all commands + cmd address |
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* |
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* 3: same as 2 |
1da177e4c
|
509 510 511 512 513 514 515 |
* * 4: same as 3 plus dump extra junk */ if (unlikely(scsi_logging_level)) { level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, SCSI_LOG_MLQUEUE_BITS); if (level > 1) { |
c11c004b1
|
516 517 518 |
scmd_printk(KERN_INFO, cmd, "Send: scmd 0x%p ", cmd); |
1da177e4c
|
519 520 521 |
scsi_print_command(cmd); if (level > 3) { printk(KERN_INFO "buffer = 0x%p, bufflen = %d," |
7b3d9545f
|
522 523 |
" queuecommand 0x%p ", |
a73e45b3d
|
524 |
scsi_sglist(cmd), scsi_bufflen(cmd), |
a4d04a4cd
|
525 |
cmd->device->host->hostt->queuecommand); |
1da177e4c
|
526 527 528 529 530 531 532 533 534 |
} } } } void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) { unsigned int level; |
1da177e4c
|
535 536 537 538 539 540 541 542 543 |
/* * If ML COMPLETE log level is greater than or equal to: * * 1: log disposition, result, opcode + command, and conditionally * sense data for failures or non SUCCESS dispositions. * * 2: same as 1 but for all command completions. * |
c11c004b1
|
544 |
* 3: same as 2 |
1da177e4c
|
545 546 547 548 549 550 551 552 |
* * 4: same as 3 plus dump extra junk */ if (unlikely(scsi_logging_level)) { level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, SCSI_LOG_MLCOMPLETE_BITS); if (((level > 0) && (cmd->result || disposition != SUCCESS)) || (level > 1)) { |
c11c004b1
|
553 |
scsi_print_result(cmd, "Done: ", disposition); |
1da177e4c
|
554 |
scsi_print_command(cmd); |
a4d04a4cd
|
555 |
if (status_byte(cmd->result) & CHECK_CONDITION) |
d811b848e
|
556 |
scsi_print_sense(cmd); |
a4d04a4cd
|
557 558 559 560 |
if (level > 3) scmd_printk(KERN_INFO, cmd, "scsi host busy %d failed %d ", |
746650160
|
561 |
atomic_read(&cmd->device->host->host_busy), |
a4d04a4cd
|
562 |
cmd->device->host->host_failed); |
1da177e4c
|
563 564 565 566 |
} } } #endif |
eb44820c2
|
567 568 569 570 571 572 |
/** * scsi_cmd_get_serial - Assign a serial number to a command * @host: the scsi host * @cmd: command to assign serial number to * * Description: a serial number identifies a request for error recovery |
1da177e4c
|
573 574 |
* and debugging purposes. Protected by the Host_Lock of host. */ |
f281233d3
|
575 |
void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) |
1da177e4c
|
576 577 578 579 |
{ cmd->serial_number = host->cmd_serial_number++; if (cmd->serial_number == 0) cmd->serial_number = host->cmd_serial_number++; |
1da177e4c
|
580 |
} |
f281233d3
|
581 |
EXPORT_SYMBOL(scsi_cmd_get_serial); |
1da177e4c
|
582 |
|
eb44820c2
|
583 |
/** |
eb44820c2
|
584 585 |
* scsi_finish_command - cleanup and pass command back to upper layer * @cmd: the command |
1da177e4c
|
586 |
* |
eb44820c2
|
587 |
* Description: Pass command off to upper layer for finishing of I/O |
1da177e4c
|
588 589 590 591 592 593 |
* request, waking processes that are waiting on results, * etc. */ void scsi_finish_command(struct scsi_cmnd *cmd) { struct scsi_device *sdev = cmd->device; |
f0c0a376d
|
594 |
struct scsi_target *starget = scsi_target(sdev); |
1da177e4c
|
595 |
struct Scsi_Host *shost = sdev->host; |
7b3d9545f
|
596 597 |
struct scsi_driver *drv; unsigned int good_bytes; |
1da177e4c
|
598 599 |
scsi_device_unbusy(sdev); |
cd9070c9c
|
600 601 602 603 604 605 606 607 608 609 |
/* * Clear the flags that say that the device/target/host is no longer * capable of accepting new commands. */ if (atomic_read(&shost->host_blocked)) atomic_set(&shost->host_blocked, 0); if (atomic_read(&starget->target_blocked)) atomic_set(&starget->target_blocked, 0); if (atomic_read(&sdev->device_blocked)) atomic_set(&sdev->device_blocked, 0); |
1da177e4c
|
610 611 612 613 614 615 616 |
/* * If we have valid sense information, then some kind of recovery * must have taken place. Make a note of this. */ if (SCSI_SENSE_VALID(cmd)) cmd->result |= (DRIVER_SENSE << 24); |
3bf743e7c
|
617 618 619 620 |
SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, "Notifying upper driver of completion " "(result %x) ", cmd->result)); |
1da177e4c
|
621 |
|
f18573abc
|
622 |
good_bytes = scsi_bufflen(cmd); |
7b3d9545f
|
623 |
if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
427e59f09
|
624 |
int old_good_bytes = good_bytes; |
7b3d9545f
|
625 626 627 |
drv = scsi_cmd_to_driver(cmd); if (drv->done) good_bytes = drv->done(cmd); |
427e59f09
|
628 629 630 631 632 633 634 635 |
/* * USB may not give sense identifying bad sector and * simply return a residue instead, so subtract off the * residue if drv->done() error processing indicates no * change to the completion length. */ if (good_bytes == old_good_bytes) good_bytes -= scsi_get_resid(cmd); |
7b3d9545f
|
636 637 |
} scsi_io_completion(cmd, good_bytes); |
1da177e4c
|
638 |
} |
1da177e4c
|
639 |
|
eb44820c2
|
640 |
/** |
db5ed4dfd
|
641 |
* scsi_change_queue_depth - change a device's queue depth |
eb44820c2
|
642 |
* @sdev: SCSI Device in question |
db5ed4dfd
|
643 |
* @depth: number of commands allowed to be queued to the driver |
1da177e4c
|
644 |
* |
db5ed4dfd
|
645 |
* Sets the device queue depth and returns the new value. |
1da177e4c
|
646 |
*/ |
db5ed4dfd
|
647 |
int scsi_change_queue_depth(struct scsi_device *sdev, int depth) |
1da177e4c
|
648 649 |
{ unsigned long flags; |
db5ed4dfd
|
650 651 |
if (depth <= 0) goto out; |
1da177e4c
|
652 653 |
spin_lock_irqsave(sdev->request_queue->queue_lock, flags); |
885ace9e2
|
654 655 656 657 658 659 660 661 662 |
/* * Check to see if the queue is managed by the block layer. * If it is, and we fail to adjust the depth, exit. * * Do not resize the tag map if it is a host wide share bqt, * because the size should be the hosts's can_queue. If there * is more IO than the LLD's can_queue (so there are not enuogh * tags) request_fn's host queue ready check will handle it. */ |
d285203cf
|
663 |
if (!shost_use_blk_mq(sdev->host) && !sdev->host->bqt) { |
885ace9e2
|
664 |
if (blk_queue_tagged(sdev->request_queue) && |
db5ed4dfd
|
665 666 |
blk_queue_resize_tags(sdev->request_queue, depth) != 0) goto out_unlock; |
885ace9e2
|
667 |
} |
1da177e4c
|
668 |
|
db5ed4dfd
|
669 670 |
sdev->queue_depth = depth; out_unlock: |
1da177e4c
|
671 |
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); |
db5ed4dfd
|
672 673 |
out: return sdev->queue_depth; |
1da177e4c
|
674 |
} |
db5ed4dfd
|
675 |
EXPORT_SYMBOL(scsi_change_queue_depth); |
1da177e4c
|
676 |
|
eb44820c2
|
677 678 679 680 681 |
/** * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth * @sdev: SCSI Device in question * @depth: Current number of outstanding SCSI commands on this device, * not counting the one returned as QUEUE_FULL. |
1da177e4c
|
682 |
* |
eb44820c2
|
683 |
* Description: This function will track successive QUEUE_FULL events on a |
1da177e4c
|
684 685 686 |
* specific SCSI device to determine if and when there is a * need to adjust the queue depth on the device. * |
eb44820c2
|
687 |
* Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, |
1da177e4c
|
688 689 690 691 692 693 694 695 696 697 |
* -1 - Drop back to untagged operation using host->cmd_per_lun * as the untagged command depth * * Lock Status: None held on entry * * Notes: Low level drivers may call this at any time and we will do * "The Right Thing." We are interrupt context safe. */ int scsi_track_queue_full(struct scsi_device *sdev, int depth) { |
4a84067db
|
698 699 700 701 702 703 704 |
/* * Don't let QUEUE_FULLs on the same * jiffies count, they could all be from * same event. */ if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) |
1da177e4c
|
705 |
return 0; |
4a84067db
|
706 |
sdev->last_queue_full_time = jiffies; |
1da177e4c
|
707 708 709 710 711 712 713 714 715 |
if (sdev->last_queue_full_depth != depth) { sdev->last_queue_full_count = 1; sdev->last_queue_full_depth = depth; } else { sdev->last_queue_full_count++; } if (sdev->last_queue_full_count <= 10) return 0; |
609aa22f3
|
716 |
|
db5ed4dfd
|
717 |
return scsi_change_queue_depth(sdev, depth); |
1da177e4c
|
718 719 720 721 |
} EXPORT_SYMBOL(scsi_track_queue_full); /** |
881a256d8
|
722 723 724 725 726 727 728 729 730 |
* scsi_vpd_inquiry - Request a device provide us with a VPD page * @sdev: The device to ask * @buffer: Where to put the result * @page: Which Vital Product Data to return * @len: The length of the buffer * * This is an internal helper function. You probably want to use * scsi_get_vpd_page instead. * |
bc8945df3
|
731 |
* Returns size of the vpd page on success or a negative error number. |
881a256d8
|
732 733 734 735 736 737 |
*/ static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, u8 page, unsigned len) { int result; unsigned char cmd[16]; |
bc8945df3
|
738 739 |
if (len < 4) return -EINVAL; |
881a256d8
|
740 741 742 743 744 745 746 747 748 749 750 751 |
cmd[0] = INQUIRY; cmd[1] = 1; /* EVPD */ cmd[2] = page; cmd[3] = len >> 8; cmd[4] = len & 0xff; cmd[5] = 0; /* Control byte */ /* * I'm not convinced we need to try quite this hard to get VPD, but * all the existing users tried this hard. */ result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, |
95a3639e2
|
752 |
len, NULL, 30 * HZ, 3, NULL); |
881a256d8
|
753 |
if (result) |
bc8945df3
|
754 |
return -EIO; |
881a256d8
|
755 756 757 758 |
/* Sanity check that we got the page back that we asked for */ if (buffer[1] != page) return -EIO; |
bc8945df3
|
759 |
return get_unaligned_be16(&buffer[2]) + 4; |
881a256d8
|
760 761 762 763 764 765 |
} /** * scsi_get_vpd_page - Get Vital Product Data from a SCSI device * @sdev: The device to ask * @page: Which Vital Product Data to return |
786f8ba2e
|
766 767 |
* @buf: where to store the VPD * @buf_len: number of bytes in the VPD buffer area |
881a256d8
|
768 769 770 771 772 773 774 775 |
* * SCSI devices may optionally supply Vital Product Data. Each 'page' * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). * If the device supports this VPD page, this routine returns a pointer * to a buffer containing the data from that page. The caller is * responsible for calling kfree() on this pointer when it is no longer * needed. If we cannot retrieve the VPD page this routine returns %NULL. */ |
e3deec090
|
776 777 |
int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, int buf_len) |
881a256d8
|
778 779 |
{ int i, result; |
881a256d8
|
780 |
|
7562523e8
|
781 782 |
if (sdev->skip_vpd_pages) goto fail; |
881a256d8
|
783 |
/* Ask for all the pages supported by this device */ |
e3deec090
|
784 |
result = scsi_vpd_inquiry(sdev, buf, 0, buf_len); |
bc8945df3
|
785 |
if (result < 4) |
881a256d8
|
786 787 788 789 |
goto fail; /* If the user actually wanted this page, we can skip the rest */ if (page == 0) |
16d3ea26f
|
790 |
return 0; |
881a256d8
|
791 |
|
bc8945df3
|
792 793 |
for (i = 4; i < min(result, buf_len); i++) if (buf[i] == page) |
881a256d8
|
794 |
goto found; |
e3deec090
|
795 |
|
bc8945df3
|
796 |
if (i < result && i >= buf_len) |
e3deec090
|
797 798 |
/* ran off the end of the buffer, give us benefit of doubt */ goto found; |
881a256d8
|
799 800 801 802 |
/* The device claims it doesn't support the requested page */ goto fail; found: |
e3deec090
|
803 |
result = scsi_vpd_inquiry(sdev, buf, page, buf_len); |
bc8945df3
|
804 |
if (result < 0) |
881a256d8
|
805 |
goto fail; |
e3deec090
|
806 |
return 0; |
881a256d8
|
807 808 |
fail: |
e3deec090
|
809 |
return -EINVAL; |
881a256d8
|
810 811 812 813 |
} EXPORT_SYMBOL_GPL(scsi_get_vpd_page); /** |
b3ae8780b
|
814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 |
* scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure * @sdev: The device to ask * * Attach the 'Device Identification' VPD page (0x83) and the * 'Unit Serial Number' VPD page (0x80) to a SCSI device * structure. This information can be used to identify the device * uniquely. */ void scsi_attach_vpd(struct scsi_device *sdev) { int result, i; int vpd_len = SCSI_VPD_PG_LEN; int pg80_supported = 0; int pg83_supported = 0; unsigned char *vpd_buf; if (sdev->skip_vpd_pages) return; retry_pg0: vpd_buf = kmalloc(vpd_len, GFP_KERNEL); if (!vpd_buf) return; /* Ask for all the pages supported by this device */ result = scsi_vpd_inquiry(sdev, vpd_buf, 0, vpd_len); if (result < 0) { kfree(vpd_buf); return; } if (result > vpd_len) { vpd_len = result; kfree(vpd_buf); goto retry_pg0; } for (i = 4; i < result; i++) { if (vpd_buf[i] == 0x80) pg80_supported = 1; if (vpd_buf[i] == 0x83) pg83_supported = 1; } kfree(vpd_buf); vpd_len = SCSI_VPD_PG_LEN; if (pg80_supported) { retry_pg80: vpd_buf = kmalloc(vpd_len, GFP_KERNEL); if (!vpd_buf) return; result = scsi_vpd_inquiry(sdev, vpd_buf, 0x80, vpd_len); if (result < 0) { kfree(vpd_buf); return; } if (result > vpd_len) { vpd_len = result; kfree(vpd_buf); goto retry_pg80; } sdev->vpd_pg80_len = result; sdev->vpd_pg80 = vpd_buf; vpd_len = SCSI_VPD_PG_LEN; } if (pg83_supported) { retry_pg83: vpd_buf = kmalloc(vpd_len, GFP_KERNEL); if (!vpd_buf) return; result = scsi_vpd_inquiry(sdev, vpd_buf, 0x83, vpd_len); if (result < 0) { kfree(vpd_buf); return; } if (result > vpd_len) { vpd_len = result; kfree(vpd_buf); goto retry_pg83; } sdev->vpd_pg83_len = result; sdev->vpd_pg83 = vpd_buf; } } /** |
3c6bdaeab
|
901 902 903 904 905 906 907 |
* scsi_report_opcode - Find out if a given command opcode is supported * @sdev: scsi device to query * @buffer: scratch buffer (must be at least 20 bytes long) * @len: length of buffer * @opcode: opcode for command to look up * * Uses the REPORT SUPPORTED OPERATION CODES to look up the given |
66c28f971
|
908 909 |
* opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is * unsupported and 1 if the device claims to support the command. |
3c6bdaeab
|
910 911 912 913 914 915 916 917 918 |
*/ int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, unsigned int len, unsigned char opcode) { unsigned char cmd[16]; struct scsi_sense_hdr sshdr; int result; if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) |
66c28f971
|
919 |
return -EINVAL; |
3c6bdaeab
|
920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 |
memset(cmd, 0, 16); cmd[0] = MAINTENANCE_IN; cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; cmd[2] = 1; /* One command format */ cmd[3] = opcode; put_unaligned_be32(len, &cmd[6]); memset(buffer, 0, len); result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, &sshdr, 30 * HZ, 3, NULL); if (result && scsi_sense_valid(&sshdr) && sshdr.sense_key == ILLEGAL_REQUEST && (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) |
66c28f971
|
935 |
return -EINVAL; |
3c6bdaeab
|
936 937 938 939 940 941 942 943 944 |
if ((buffer[1] & 3) == 3) /* Command supported */ return 1; return 0; } EXPORT_SYMBOL(scsi_report_opcode); /** |
eb44820c2
|
945 |
* scsi_device_get - get an additional reference to a scsi_device |
1da177e4c
|
946 947 |
* @sdev: device to get a reference to * |
eb44820c2
|
948 |
* Description: Gets a reference to the scsi_device and increments the use count |
1da177e4c
|
949 950 951 952 953 |
* of the underlying LLDD module. You must hold host_lock of the * parent Scsi_Host or already have a reference when calling this. */ int scsi_device_get(struct scsi_device *sdev) { |
85b6c720b
|
954 |
if (sdev->sdev_state == SDEV_DEL) |
1da177e4c
|
955 956 957 |
return -ENXIO; if (!get_device(&sdev->sdev_gendev)) return -ENXIO; |
dc4515ea2
|
958 |
/* We can fail try_module_get if we're doing SCSI operations |
85b6c720b
|
959 |
* from module exit (like cache flush) */ |
dc4515ea2
|
960 |
__module_get(sdev->host->hostt->module); |
85b6c720b
|
961 |
|
1da177e4c
|
962 963 964 965 966 967 968 969 |
return 0; } EXPORT_SYMBOL(scsi_device_get); /** * scsi_device_put - release a reference to a scsi_device * @sdev: device to release a reference on. * |
eb44820c2
|
970 971 |
* Description: Release a reference to the scsi_device and decrements the use * count of the underlying LLDD module. The device is freed once the last |
1da177e4c
|
972 973 974 975 |
* user vanishes. */ void scsi_device_put(struct scsi_device *sdev) { |
dc4515ea2
|
976 |
module_put(sdev->host->hostt->module); |
1da177e4c
|
977 978 979 |
put_device(&sdev->sdev_gendev); } EXPORT_SYMBOL(scsi_device_put); |
eb44820c2
|
980 |
/* helper for shost_for_each_device, see that for documentation */ |
1da177e4c
|
981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 |
struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, struct scsi_device *prev) { struct list_head *list = (prev ? &prev->siblings : &shost->__devices); struct scsi_device *next = NULL; unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); while (list->next != &shost->__devices) { next = list_entry(list->next, struct scsi_device, siblings); /* skip devices that we can't get a reference to */ if (!scsi_device_get(next)) break; next = NULL; list = list->next; } spin_unlock_irqrestore(shost->host_lock, flags); if (prev) scsi_device_put(prev); return next; } EXPORT_SYMBOL(__scsi_iterate_devices); /** * starget_for_each_device - helper to walk all devices of a target * @starget: target whose devices we want to iterate over. |
eb44820c2
|
1008 1009 |
* @data: Opaque passed to each function call. * @fn: Function to call on each device |
1da177e4c
|
1010 |
* |
522939d45
|
1011 |
* This traverses over each device of @starget. The devices have |
1da177e4c
|
1012 1013 1014 |
* a reference that must be released by scsi_host_put when breaking * out of the loop. */ |
522939d45
|
1015 |
void starget_for_each_device(struct scsi_target *starget, void *data, |
1da177e4c
|
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
void (*fn)(struct scsi_device *, void *)) { struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct scsi_device *sdev; shost_for_each_device(sdev, shost) { if ((sdev->channel == starget->channel) && (sdev->id == starget->id)) fn(sdev, data); } } EXPORT_SYMBOL(starget_for_each_device); /** |
14f501a4b
|
1030 |
* __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) |
522939d45
|
1031 |
* @starget: target whose devices we want to iterate over. |
14f501a4b
|
1032 1033 |
* @data: parameter for callback @fn() * @fn: callback function that is invoked for each device |
522939d45
|
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 |
* * This traverses over each device of @starget. It does _not_ * take a reference on the scsi_device, so the whole loop must be * protected by shost->host_lock. * * Note: The only reason why drivers would want to use this is because * they need to access the device list in irq context. Otherwise you * really want to use starget_for_each_device instead. **/ void __starget_for_each_device(struct scsi_target *starget, void *data, void (*fn)(struct scsi_device *, void *)) { struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); struct scsi_device *sdev; __shost_for_each_device(sdev, shost) { if ((sdev->channel == starget->channel) && (sdev->id == starget->id)) fn(sdev, data); } } EXPORT_SYMBOL(__starget_for_each_device); /** |
1da177e4c
|
1058 1059 1060 1061 |
* __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) * @starget: SCSI target pointer * @lun: SCSI Logical Unit Number * |
eb44820c2
|
1062 1063 |
* Description: Looks up the scsi_device with the specified @lun for a given * @starget. The returned scsi_device does not have an additional |
1da177e4c
|
1064 |
* reference. You must hold the host's host_lock over this call and |
32aeef605
|
1065 1066 |
* any access to the returned scsi_device. A scsi_device in state * SDEV_DEL is skipped. |
1da177e4c
|
1067 |
* |
dc8875e10
|
1068 |
* Note: The only reason why drivers should use this is because |
eb44820c2
|
1069 |
* they need to access the device list in irq context. Otherwise you |
1da177e4c
|
1070 1071 1072 |
* really want to use scsi_device_lookup_by_target instead. **/ struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, |
9cb78c16f
|
1073 |
u64 lun) |
1da177e4c
|
1074 1075 1076 1077 |
{ struct scsi_device *sdev; list_for_each_entry(sdev, &starget->devices, same_target_siblings) { |
32aeef605
|
1078 1079 |
if (sdev->sdev_state == SDEV_DEL) continue; |
1da177e4c
|
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 |
if (sdev->lun ==lun) return sdev; } return NULL; } EXPORT_SYMBOL(__scsi_device_lookup_by_target); /** * scsi_device_lookup_by_target - find a device given the target * @starget: SCSI target pointer * @lun: SCSI Logical Unit Number * |
477e608c0
|
1093 1094 |
* Description: Looks up the scsi_device with the specified @lun for a given * @starget. The returned scsi_device has an additional reference that |
eb44820c2
|
1095 |
* needs to be released with scsi_device_put once you're done with it. |
1da177e4c
|
1096 1097 |
**/ struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, |
9cb78c16f
|
1098 |
u64 lun) |
1da177e4c
|
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 |
{ struct scsi_device *sdev; struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); sdev = __scsi_device_lookup_by_target(starget, lun); if (sdev && scsi_device_get(sdev)) sdev = NULL; spin_unlock_irqrestore(shost->host_lock, flags); return sdev; } EXPORT_SYMBOL(scsi_device_lookup_by_target); /** |
eb44820c2
|
1115 |
* __scsi_device_lookup - find a device given the host (UNLOCKED) |
1da177e4c
|
1116 1117 |
* @shost: SCSI host pointer * @channel: SCSI channel (zero if only one channel) |
eb44820c2
|
1118 |
* @id: SCSI target number (physical unit number) |
1da177e4c
|
1119 1120 |
* @lun: SCSI Logical Unit Number * |
eb44820c2
|
1121 1122 1123 1124 |
* Description: Looks up the scsi_device with the specified @channel, @id, @lun * for a given host. The returned scsi_device does not have an additional * reference. You must hold the host's host_lock over this call and any access * to the returned scsi_device. |
1da177e4c
|
1125 1126 |
* * Note: The only reason why drivers would want to use this is because |
eb44820c2
|
1127 |
* they need to access the device list in irq context. Otherwise you |
1da177e4c
|
1128 1129 1130 |
* really want to use scsi_device_lookup instead. **/ struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, |
9cb78c16f
|
1131 |
uint channel, uint id, u64 lun) |
1da177e4c
|
1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 |
{ struct scsi_device *sdev; list_for_each_entry(sdev, &shost->__devices, siblings) { if (sdev->channel == channel && sdev->id == id && sdev->lun ==lun) return sdev; } return NULL; } EXPORT_SYMBOL(__scsi_device_lookup); /** * scsi_device_lookup - find a device given the host * @shost: SCSI host pointer * @channel: SCSI channel (zero if only one channel) * @id: SCSI target number (physical unit number) * @lun: SCSI Logical Unit Number * |
eb44820c2
|
1152 1153 1154 |
* Description: Looks up the scsi_device with the specified @channel, @id, @lun * for a given host. The returned scsi_device has an additional reference that * needs to be released with scsi_device_put once you're done with it. |
1da177e4c
|
1155 1156 |
**/ struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, |
9cb78c16f
|
1157 |
uint channel, uint id, u64 lun) |
1da177e4c
|
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 |
{ struct scsi_device *sdev; unsigned long flags; spin_lock_irqsave(shost->host_lock, flags); sdev = __scsi_device_lookup(shost, channel, id, lun); if (sdev && scsi_device_get(sdev)) sdev = NULL; spin_unlock_irqrestore(shost->host_lock, flags); return sdev; } EXPORT_SYMBOL(scsi_device_lookup); |
1da177e4c
|
1171 1172 1173 1174 1175 |
MODULE_DESCRIPTION("SCSI core"); MODULE_LICENSE("GPL"); module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); |
24c20f105
|
1176 1177 1178 |
#ifdef CONFIG_SCSI_MQ_DEFAULT bool scsi_use_blk_mq = true; #else |
d285203cf
|
1179 |
bool scsi_use_blk_mq = false; |
24c20f105
|
1180 |
#endif |
d285203cf
|
1181 |
module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO); |
1da177e4c
|
1182 1183 |
static int __init init_scsi(void) { |
9bf09c238
|
1184 |
int error; |
1da177e4c
|
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
error = scsi_init_queue(); if (error) return error; error = scsi_init_procfs(); if (error) goto cleanup_queue; error = scsi_init_devinfo(); if (error) goto cleanup_procfs; error = scsi_init_hosts(); if (error) goto cleanup_devlist; error = scsi_init_sysctl(); if (error) goto cleanup_hosts; error = scsi_sysfs_register(); if (error) goto cleanup_sysctl; |
84314fd47
|
1204 |
scsi_netlink_init(); |
1da177e4c
|
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 |
printk(KERN_NOTICE "SCSI subsystem initialized "); return 0; cleanup_sysctl: scsi_exit_sysctl(); cleanup_hosts: scsi_exit_hosts(); cleanup_devlist: scsi_exit_devinfo(); cleanup_procfs: scsi_exit_procfs(); cleanup_queue: scsi_exit_queue(); printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d ", -error); return error; } static void __exit exit_scsi(void) { |
84314fd47
|
1227 |
scsi_netlink_exit(); |
1da177e4c
|
1228 1229 1230 1231 |
scsi_sysfs_unregister(); scsi_exit_sysctl(); scsi_exit_hosts(); scsi_exit_devinfo(); |
1da177e4c
|
1232 1233 |
scsi_exit_procfs(); scsi_exit_queue(); |
a4683487f
|
1234 |
async_unregister_domain(&scsi_sd_probe_domain); |
1da177e4c
|
1235 1236 1237 1238 |
} subsys_initcall(init_scsi); module_exit(exit_scsi); |