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![James Bottomley](/assets/img/avatar_default.png)
hostt->name might contain space, so use the ->proc_name short name instead when creating per-driver command slabs. Signed-off-by: James Bottomley <JBottomley@Parallels.com> Reported-by: poma <pomidorabelisima@gmail.com> Tested-by: poma <pomidorabelisima@gmail.com> Reviewed-by: Vladimir Davydov <vdavydov@parallels.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Cc: stable@vger.kernel.org Signed-off-by: Christoph Hellwig <hch@lst.de>
1425 lines
38 KiB
C
1425 lines
38 KiB
C
/*
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* scsi.c Copyright (C) 1992 Drew Eckhardt
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* Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
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* Copyright (C) 2002, 2003 Christoph Hellwig
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*
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* generic mid-level SCSI driver
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* Initial versions: Drew Eckhardt
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* Subsequent revisions: Eric Youngdale
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*
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* <drew@colorado.edu>
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*
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* Bug correction thanks go to :
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* Rik Faith <faith@cs.unc.edu>
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* Tommy Thorn <tthorn>
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* Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de>
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*
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* Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to
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* add scatter-gather, multiple outstanding request, and other
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* enhancements.
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*
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* Native multichannel, wide scsi, /proc/scsi and hot plugging
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* support added by Michael Neuffer <mike@i-connect.net>
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*
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* Added request_module("scsi_hostadapter") for kerneld:
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* (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf)
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* Bjorn Ekwall <bj0rn@blox.se>
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* (changed to kmod)
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*
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* Major improvements to the timeout, abort, and reset processing,
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* as well as performance modifications for large queue depths by
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* Leonard N. Zubkoff <lnz@dandelion.com>
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*
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* Converted cli() code to spinlocks, Ingo Molnar
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*
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* Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
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*
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* out_of_space hacks, D. Gilbert (dpg) 990608
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/completion.h>
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#include <linux/unistd.h>
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#include <linux/spinlock.h>
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#include <linux/kmod.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#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>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_dbg.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_driver.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tcq.h>
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#include "scsi_priv.h"
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#include "scsi_logging.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/scsi.h>
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/*
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* Definitions and constants.
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*/
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/*
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* Note - the initial logging level can be set here to log events at boot time.
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* After the system is up, you may enable logging via the /proc interface.
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*/
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unsigned int scsi_logging_level;
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#if defined(CONFIG_SCSI_LOGGING)
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EXPORT_SYMBOL(scsi_logging_level);
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#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
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* asynchronous system resume operations. It is marked 'exclusive' to avoid
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* being included in the async_synchronize_full() that is invoked by
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* dpm_resume()
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*/
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ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain);
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EXPORT_SYMBOL(scsi_sd_pm_domain);
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/* NB: These are exposed through /proc/scsi/scsi and form part of the ABI.
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* You may not alter any existing entry (although adding new ones is
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* encouraged once assigned by ANSI/INCITS T10
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*/
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static const char *const scsi_device_types[] = {
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"Direct-Access ",
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"Sequential-Access",
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"Printer ",
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"Processor ",
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"WORM ",
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"CD-ROM ",
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"Scanner ",
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"Optical Device ",
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"Medium Changer ",
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"Communications ",
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"ASC IT8 ",
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"ASC IT8 ",
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"RAID ",
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"Enclosure ",
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"Direct-Access-RBC",
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"Optical card ",
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"Bridge controller",
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"Object storage ",
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"Automation/Drive ",
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"Security Manager ",
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"Direct-Access-ZBC",
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};
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/**
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* scsi_device_type - Return 17 char string indicating device type.
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* @type: type number to look up
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*/
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const char * scsi_device_type(unsigned type)
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{
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if (type == 0x1e)
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return "Well-known LUN ";
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if (type == 0x1f)
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return "No Device ";
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if (type >= ARRAY_SIZE(scsi_device_types))
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return "Unknown ";
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return scsi_device_types[type];
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}
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EXPORT_SYMBOL(scsi_device_type);
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struct scsi_host_cmd_pool {
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struct kmem_cache *cmd_slab;
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struct kmem_cache *sense_slab;
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unsigned int users;
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char *cmd_name;
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char *sense_name;
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unsigned int slab_flags;
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gfp_t gfp_mask;
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};
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static struct scsi_host_cmd_pool scsi_cmd_pool = {
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.cmd_name = "scsi_cmd_cache",
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.sense_name = "scsi_sense_cache",
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.slab_flags = SLAB_HWCACHE_ALIGN,
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};
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static struct scsi_host_cmd_pool scsi_cmd_dma_pool = {
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.cmd_name = "scsi_cmd_cache(DMA)",
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.sense_name = "scsi_sense_cache(DMA)",
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.slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA,
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.gfp_mask = __GFP_DMA,
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};
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static DEFINE_MUTEX(host_cmd_pool_mutex);
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/**
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* scsi_host_free_command - internal function to release a command
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* @shost: host to free the command for
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* @cmd: command to release
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*
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* the command must previously have been allocated by
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* scsi_host_alloc_command.
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*/
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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)
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kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb);
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kmem_cache_free(pool->sense_slab, cmd->sense_buffer);
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kmem_cache_free(pool->cmd_slab, cmd);
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}
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/**
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* scsi_host_alloc_command - internal function to allocate command
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* @shost: SCSI host whose pool to allocate from
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* @gfp_mask: mask for the allocation
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*
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* Returns a fully allocated command with sense buffer and protection
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* data buffer (where applicable) or NULL on failure
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*/
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static struct scsi_cmnd *
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scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask)
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{
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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;
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cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab,
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gfp_mask | pool->gfp_mask);
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if (!cmd->sense_buffer)
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goto fail_free_cmd;
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if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) {
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cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask);
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if (!cmd->prot_sdb)
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goto fail_free_sense;
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}
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return cmd;
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fail_free_sense:
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kmem_cache_free(pool->sense_slab, cmd->sense_buffer);
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fail_free_cmd:
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kmem_cache_free(pool->cmd_slab, cmd);
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fail:
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return NULL;
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}
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/**
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* __scsi_get_command - Allocate a struct scsi_cmnd
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* @shost: host to transmit command
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* @gfp_mask: allocation mask
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*
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* Description: allocate a struct scsi_cmd from host's slab, recycling from the
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* host's free_list if necessary.
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*/
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static struct scsi_cmnd *
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__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)) {
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unsigned long flags;
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spin_lock_irqsave(&shost->free_list_lock, flags);
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if (likely(!list_empty(&shost->free_list))) {
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cmd = list_entry(shost->free_list.next,
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struct scsi_cmnd, list);
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list_del_init(&cmd->list);
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}
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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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}
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return cmd;
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}
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/**
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* scsi_get_command - Allocate and setup a scsi command block
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* @dev: parent scsi device
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* @gfp_mask: allocator flags
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*
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* Returns: The allocated scsi command structure.
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*/
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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);
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unsigned long flags;
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if (unlikely(cmd == NULL))
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return NULL;
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cmd->device = dev;
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INIT_LIST_HEAD(&cmd->list);
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INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
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spin_lock_irqsave(&dev->list_lock, flags);
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list_add_tail(&cmd->list, &dev->cmd_list);
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spin_unlock_irqrestore(&dev->list_lock, flags);
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cmd->jiffies_at_alloc = jiffies;
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return cmd;
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}
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/**
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* __scsi_put_command - Free a struct scsi_cmnd
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* @shost: dev->host
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* @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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{
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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);
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if (list_empty(&shost->free_list)) {
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list_add(&cmd->list, &shost->free_list);
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cmd = NULL;
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}
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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
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* @cmd: command block to free
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*
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* Returns: Nothing.
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*
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* Notes: The command must not belong to any lists.
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*/
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void scsi_put_command(struct scsi_cmnd *cmd)
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{
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unsigned long flags;
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/* serious error if the command hasn't come from a device list */
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spin_lock_irqsave(&cmd->device->list_lock, flags);
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BUG_ON(list_empty(&cmd->list));
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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 *
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scsi_find_host_cmd_pool(struct Scsi_Host *shost)
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{
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if (shost->hostt->cmd_size)
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return shost->hostt->cmd_pool;
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if (shost->unchecked_isa_dma)
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return &scsi_cmd_dma_pool;
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return &scsi_cmd_pool;
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}
|
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|
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static void
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scsi_free_host_cmd_pool(struct scsi_host_cmd_pool *pool)
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{
|
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kfree(pool->sense_name);
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kfree(pool->cmd_name);
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kfree(pool);
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}
|
|
|
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static struct scsi_host_cmd_pool *
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scsi_alloc_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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pool = kzalloc(sizeof(*pool), GFP_KERNEL);
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if (!pool)
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return NULL;
|
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|
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pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->proc_name);
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pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->proc_name);
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if (!pool->cmd_name || !pool->sense_name) {
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scsi_free_host_cmd_pool(pool);
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return NULL;
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}
|
|
|
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pool->slab_flags = SLAB_HWCACHE_ALIGN;
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if (shost->unchecked_isa_dma) {
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pool->slab_flags |= SLAB_CACHE_DMA;
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pool->gfp_mask = __GFP_DMA;
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}
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return pool;
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}
|
|
|
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static struct scsi_host_cmd_pool *
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scsi_get_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 *retval = NULL, *pool;
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size_t cmd_size = sizeof(struct scsi_cmnd) + hostt->cmd_size;
|
|
|
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/*
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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);
|
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if (!pool) {
|
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pool = scsi_alloc_host_cmd_pool(shost);
|
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if (!pool)
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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);
|
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if (!pool->cmd_slab)
|
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goto out_free_pool;
|
|
|
|
pool->sense_slab = kmem_cache_create(pool->sense_name,
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SCSI_SENSE_BUFFERSIZE, 0,
|
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pool->slab_flags, NULL);
|
|
if (!pool->sense_slab)
|
|
goto out_free_slab;
|
|
}
|
|
|
|
pool->users++;
|
|
retval = pool;
|
|
out:
|
|
mutex_unlock(&host_cmd_pool_mutex);
|
|
return retval;
|
|
|
|
out_free_slab:
|
|
kmem_cache_destroy(pool->cmd_slab);
|
|
out_free_pool:
|
|
if (hostt->cmd_size)
|
|
scsi_free_host_cmd_pool(pool);
|
|
goto out;
|
|
}
|
|
|
|
static void scsi_put_host_cmd_pool(struct Scsi_Host *shost)
|
|
{
|
|
struct scsi_host_template *hostt = shost->hostt;
|
|
struct scsi_host_cmd_pool *pool;
|
|
|
|
mutex_lock(&host_cmd_pool_mutex);
|
|
pool = scsi_find_host_cmd_pool(shost);
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
BUG_ON(pool->users == 0);
|
|
|
|
if (!--pool->users) {
|
|
kmem_cache_destroy(pool->cmd_slab);
|
|
kmem_cache_destroy(pool->sense_slab);
|
|
if (hostt->cmd_size)
|
|
scsi_free_host_cmd_pool(pool);
|
|
}
|
|
mutex_unlock(&host_cmd_pool_mutex);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
const gfp_t gfp_mask = shost->unchecked_isa_dma ? GFP_DMA : GFP_KERNEL;
|
|
struct scsi_cmnd *cmd;
|
|
|
|
spin_lock_init(&shost->free_list_lock);
|
|
INIT_LIST_HEAD(&shost->free_list);
|
|
|
|
shost->cmd_pool = scsi_get_host_cmd_pool(shost);
|
|
if (!shost->cmd_pool)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Get one backup command for this host.
|
|
*/
|
|
cmd = scsi_host_alloc_command(shost, gfp_mask);
|
|
if (!cmd) {
|
|
scsi_put_host_cmd_pool(shost);
|
|
shost->cmd_pool = NULL;
|
|
return -ENOMEM;
|
|
}
|
|
list_add(&cmd->list, &shost->free_list);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* scsi_destroy_command_freelist - Release the command freelist for a scsi host.
|
|
* @shost: host whose freelist is going to be destroyed
|
|
*/
|
|
void scsi_destroy_command_freelist(struct Scsi_Host *shost)
|
|
{
|
|
/*
|
|
* If cmd_pool is NULL the free list was not initialized, so
|
|
* do not attempt to release resources.
|
|
*/
|
|
if (!shost->cmd_pool)
|
|
return;
|
|
|
|
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);
|
|
scsi_host_free_command(shost, cmd);
|
|
}
|
|
shost->cmd_pool = NULL;
|
|
scsi_put_host_cmd_pool(shost);
|
|
}
|
|
|
|
#ifdef CONFIG_SCSI_LOGGING
|
|
void scsi_log_send(struct scsi_cmnd *cmd)
|
|
{
|
|
unsigned int level;
|
|
|
|
/*
|
|
* If ML QUEUE log level is greater than or equal to:
|
|
*
|
|
* 1: nothing (match completion)
|
|
*
|
|
* 2: log opcode + command of all commands
|
|
*
|
|
* 3: same as 2 plus dump cmd address
|
|
*
|
|
* 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) {
|
|
scmd_printk(KERN_INFO, cmd, "Send: ");
|
|
if (level > 2)
|
|
printk("0x%p ", cmd);
|
|
printk("\n");
|
|
scsi_print_command(cmd);
|
|
if (level > 3) {
|
|
printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"
|
|
" queuecommand 0x%p\n",
|
|
scsi_sglist(cmd), scsi_bufflen(cmd),
|
|
cmd->device->host->hostt->queuecommand);
|
|
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
|
|
{
|
|
unsigned int level;
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* 3: same as 2 plus dump cmd address
|
|
*
|
|
* 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)) {
|
|
scmd_printk(KERN_INFO, cmd, "Done: ");
|
|
if (level > 2)
|
|
printk("0x%p ", cmd);
|
|
/*
|
|
* Dump truncated values, so we usually fit within
|
|
* 80 chars.
|
|
*/
|
|
switch (disposition) {
|
|
case SUCCESS:
|
|
printk("SUCCESS\n");
|
|
break;
|
|
case NEEDS_RETRY:
|
|
printk("RETRY\n");
|
|
break;
|
|
case ADD_TO_MLQUEUE:
|
|
printk("MLQUEUE\n");
|
|
break;
|
|
case FAILED:
|
|
printk("FAILED\n");
|
|
break;
|
|
case TIMEOUT_ERROR:
|
|
/*
|
|
* If called via scsi_times_out.
|
|
*/
|
|
printk("TIMEOUT\n");
|
|
break;
|
|
default:
|
|
printk("UNKNOWN\n");
|
|
}
|
|
scsi_print_result(cmd);
|
|
scsi_print_command(cmd);
|
|
if (status_byte(cmd->result) & CHECK_CONDITION)
|
|
scsi_print_sense("", cmd);
|
|
if (level > 3)
|
|
scmd_printk(KERN_INFO, cmd,
|
|
"scsi host busy %d failed %d\n",
|
|
atomic_read(&cmd->device->host->host_busy),
|
|
cmd->device->host->host_failed);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* 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
|
|
* and debugging purposes. Protected by the Host_Lock of host.
|
|
*/
|
|
void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd)
|
|
{
|
|
cmd->serial_number = host->cmd_serial_number++;
|
|
if (cmd->serial_number == 0)
|
|
cmd->serial_number = host->cmd_serial_number++;
|
|
}
|
|
EXPORT_SYMBOL(scsi_cmd_get_serial);
|
|
|
|
/**
|
|
* scsi_dispatch_command - Dispatch a command to the low-level driver.
|
|
* @cmd: command block we are dispatching.
|
|
*
|
|
* Return: nonzero return request was rejected and device's queue needs to be
|
|
* plugged.
|
|
*/
|
|
int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
|
|
{
|
|
struct Scsi_Host *host = cmd->device->host;
|
|
int rtn = 0;
|
|
|
|
atomic_inc(&cmd->device->iorequest_cnt);
|
|
|
|
/* check if the device is still usable */
|
|
if (unlikely(cmd->device->sdev_state == SDEV_DEL)) {
|
|
/* in SDEV_DEL we error all commands. DID_NO_CONNECT
|
|
* returns an immediate error upwards, and signals
|
|
* that the device is no longer present */
|
|
cmd->result = DID_NO_CONNECT << 16;
|
|
goto done;
|
|
}
|
|
|
|
/* Check to see if the scsi lld made this device blocked. */
|
|
if (unlikely(scsi_device_blocked(cmd->device))) {
|
|
/*
|
|
* in blocked state, the command is just put back on
|
|
* the device queue. The suspend state has already
|
|
* blocked the queue so future requests should not
|
|
* occur until the device transitions out of the
|
|
* suspend state.
|
|
*/
|
|
SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd,
|
|
"queuecommand : device blocked\n"));
|
|
return SCSI_MLQUEUE_DEVICE_BUSY;
|
|
}
|
|
|
|
/*
|
|
* If SCSI-2 or lower, store the LUN value in cmnd.
|
|
*/
|
|
if (cmd->device->scsi_level <= SCSI_2 &&
|
|
cmd->device->scsi_level != SCSI_UNKNOWN) {
|
|
cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
|
|
(cmd->device->lun << 5 & 0xe0);
|
|
}
|
|
|
|
scsi_log_send(cmd);
|
|
|
|
/*
|
|
* Before we queue this command, check if the command
|
|
* length exceeds what the host adapter can handle.
|
|
*/
|
|
if (cmd->cmd_len > cmd->device->host->max_cmd_len) {
|
|
SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd,
|
|
"queuecommand : command too long. "
|
|
"cdb_size=%d host->max_cmd_len=%d\n",
|
|
cmd->cmd_len, cmd->device->host->max_cmd_len));
|
|
cmd->result = (DID_ABORT << 16);
|
|
goto done;
|
|
}
|
|
|
|
if (unlikely(host->shost_state == SHOST_DEL)) {
|
|
cmd->result = (DID_NO_CONNECT << 16);
|
|
goto done;
|
|
|
|
}
|
|
|
|
trace_scsi_dispatch_cmd_start(cmd);
|
|
rtn = host->hostt->queuecommand(host, cmd);
|
|
if (rtn) {
|
|
trace_scsi_dispatch_cmd_error(cmd, rtn);
|
|
if (rtn != SCSI_MLQUEUE_DEVICE_BUSY &&
|
|
rtn != SCSI_MLQUEUE_TARGET_BUSY)
|
|
rtn = SCSI_MLQUEUE_HOST_BUSY;
|
|
|
|
SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd,
|
|
"queuecommand : request rejected\n"));
|
|
}
|
|
|
|
return rtn;
|
|
done:
|
|
cmd->scsi_done(cmd);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* scsi_finish_command - cleanup and pass command back to upper layer
|
|
* @cmd: the command
|
|
*
|
|
* Description: Pass command off to upper layer for finishing of I/O
|
|
* request, waking processes that are waiting on results,
|
|
* etc.
|
|
*/
|
|
void scsi_finish_command(struct scsi_cmnd *cmd)
|
|
{
|
|
struct scsi_device *sdev = cmd->device;
|
|
struct scsi_target *starget = scsi_target(sdev);
|
|
struct Scsi_Host *shost = sdev->host;
|
|
struct scsi_driver *drv;
|
|
unsigned int good_bytes;
|
|
|
|
scsi_device_unbusy(sdev);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
/*
|
|
* 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);
|
|
|
|
SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev,
|
|
"Notifying upper driver of completion "
|
|
"(result %x)\n", cmd->result));
|
|
|
|
good_bytes = scsi_bufflen(cmd);
|
|
if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {
|
|
int old_good_bytes = good_bytes;
|
|
drv = scsi_cmd_to_driver(cmd);
|
|
if (drv->done)
|
|
good_bytes = drv->done(cmd);
|
|
/*
|
|
* 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);
|
|
}
|
|
scsi_io_completion(cmd, good_bytes);
|
|
}
|
|
|
|
/**
|
|
* scsi_adjust_queue_depth - Let low level drivers change a device's queue depth
|
|
* @sdev: SCSI Device in question
|
|
* @tagged: Do we use tagged queueing (non-0) or do we treat
|
|
* this device as an untagged device (0)
|
|
* @tags: Number of tags allowed if tagged queueing enabled,
|
|
* or number of commands the low level driver can
|
|
* queue up in non-tagged mode (as per cmd_per_lun).
|
|
*
|
|
* Returns: Nothing
|
|
*
|
|
* Lock Status: None held on entry
|
|
*
|
|
* Notes: Low level drivers may call this at any time and we will do
|
|
* the right thing depending on whether or not the device is
|
|
* currently active and whether or not it even has the
|
|
* command blocks built yet.
|
|
*/
|
|
void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags)
|
|
{
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* refuse to set tagged depth to an unworkable size
|
|
*/
|
|
if (tags <= 0)
|
|
return;
|
|
|
|
spin_lock_irqsave(sdev->request_queue->queue_lock, flags);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (!shost_use_blk_mq(sdev->host) && !sdev->host->bqt) {
|
|
if (blk_queue_tagged(sdev->request_queue) &&
|
|
blk_queue_resize_tags(sdev->request_queue, tags) != 0)
|
|
goto out;
|
|
}
|
|
|
|
sdev->queue_depth = tags;
|
|
switch (tagged) {
|
|
case 0:
|
|
sdev->ordered_tags = 0;
|
|
sdev->simple_tags = 0;
|
|
break;
|
|
case MSG_ORDERED_TAG:
|
|
sdev->ordered_tags = 1;
|
|
sdev->simple_tags = 1;
|
|
break;
|
|
case MSG_SIMPLE_TAG:
|
|
sdev->ordered_tags = 0;
|
|
sdev->simple_tags = 1;
|
|
break;
|
|
default:
|
|
sdev->ordered_tags = 0;
|
|
sdev->simple_tags = 0;
|
|
sdev_printk(KERN_WARNING, sdev,
|
|
"scsi_adjust_queue_depth, bad queue type, "
|
|
"disabled\n");
|
|
}
|
|
out:
|
|
spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
|
|
}
|
|
EXPORT_SYMBOL(scsi_adjust_queue_depth);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Description: This function will track successive QUEUE_FULL events on a
|
|
* specific SCSI device to determine if and when there is a
|
|
* need to adjust the queue depth on the device.
|
|
*
|
|
* Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth,
|
|
* -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)
|
|
{
|
|
|
|
/*
|
|
* 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))
|
|
return 0;
|
|
|
|
sdev->last_queue_full_time = jiffies;
|
|
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;
|
|
if (sdev->last_queue_full_depth < 8) {
|
|
/* Drop back to untagged */
|
|
scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun);
|
|
return -1;
|
|
}
|
|
|
|
if (sdev->ordered_tags)
|
|
scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth);
|
|
else
|
|
scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth);
|
|
return depth;
|
|
}
|
|
EXPORT_SYMBOL(scsi_track_queue_full);
|
|
|
|
/**
|
|
* 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.
|
|
*
|
|
* Returns size of the vpd page on success or a negative error number.
|
|
*/
|
|
static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer,
|
|
u8 page, unsigned len)
|
|
{
|
|
int result;
|
|
unsigned char cmd[16];
|
|
|
|
if (len < 4)
|
|
return -EINVAL;
|
|
|
|
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,
|
|
len, NULL, 30 * HZ, 3, NULL);
|
|
if (result)
|
|
return -EIO;
|
|
|
|
/* Sanity check that we got the page back that we asked for */
|
|
if (buffer[1] != page)
|
|
return -EIO;
|
|
|
|
return get_unaligned_be16(&buffer[2]) + 4;
|
|
}
|
|
|
|
/**
|
|
* scsi_get_vpd_page - Get Vital Product Data from a SCSI device
|
|
* @sdev: The device to ask
|
|
* @page: Which Vital Product Data to return
|
|
* @buf: where to store the VPD
|
|
* @buf_len: number of bytes in the VPD buffer area
|
|
*
|
|
* 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.
|
|
*/
|
|
int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf,
|
|
int buf_len)
|
|
{
|
|
int i, result;
|
|
|
|
if (sdev->skip_vpd_pages)
|
|
goto fail;
|
|
|
|
/* Ask for all the pages supported by this device */
|
|
result = scsi_vpd_inquiry(sdev, buf, 0, buf_len);
|
|
if (result < 4)
|
|
goto fail;
|
|
|
|
/* If the user actually wanted this page, we can skip the rest */
|
|
if (page == 0)
|
|
return 0;
|
|
|
|
for (i = 4; i < min(result, buf_len); i++)
|
|
if (buf[i] == page)
|
|
goto found;
|
|
|
|
if (i < result && i >= buf_len)
|
|
/* ran off the end of the buffer, give us benefit of doubt */
|
|
goto found;
|
|
/* The device claims it doesn't support the requested page */
|
|
goto fail;
|
|
|
|
found:
|
|
result = scsi_vpd_inquiry(sdev, buf, page, buf_len);
|
|
if (result < 0)
|
|
goto fail;
|
|
|
|
return 0;
|
|
|
|
fail:
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(scsi_get_vpd_page);
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is
|
|
* unsupported and 1 if the device claims to support the command.
|
|
*/
|
|
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)
|
|
return -EINVAL;
|
|
|
|
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)
|
|
return -EINVAL;
|
|
|
|
if ((buffer[1] & 3) == 3) /* Command supported */
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(scsi_report_opcode);
|
|
|
|
/**
|
|
* scsi_device_get - get an additional reference to a scsi_device
|
|
* @sdev: device to get a reference to
|
|
*
|
|
* Description: Gets a reference to the scsi_device and increments the use count
|
|
* 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)
|
|
{
|
|
if (sdev->sdev_state == SDEV_DEL)
|
|
return -ENXIO;
|
|
if (!get_device(&sdev->sdev_gendev))
|
|
return -ENXIO;
|
|
/* We can fail this if we're doing SCSI operations
|
|
* from module exit (like cache flush) */
|
|
try_module_get(sdev->host->hostt->module);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(scsi_device_get);
|
|
|
|
/**
|
|
* scsi_device_put - release a reference to a scsi_device
|
|
* @sdev: device to release a reference on.
|
|
*
|
|
* 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
|
|
* user vanishes.
|
|
*/
|
|
void scsi_device_put(struct scsi_device *sdev)
|
|
{
|
|
#ifdef CONFIG_MODULE_UNLOAD
|
|
struct module *module = sdev->host->hostt->module;
|
|
|
|
/* The module refcount will be zero if scsi_device_get()
|
|
* was called from a module removal routine */
|
|
if (module && module_refcount(module) != 0)
|
|
module_put(module);
|
|
#endif
|
|
put_device(&sdev->sdev_gendev);
|
|
}
|
|
EXPORT_SYMBOL(scsi_device_put);
|
|
|
|
/* helper for shost_for_each_device, see that for documentation */
|
|
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.
|
|
* @data: Opaque passed to each function call.
|
|
* @fn: Function to call on each device
|
|
*
|
|
* This traverses over each device of @starget. The devices have
|
|
* a reference that must be released by scsi_host_put when breaking
|
|
* out of the loop.
|
|
*/
|
|
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);
|
|
|
|
/**
|
|
* __starget_for_each_device - helper to walk all devices of a target (UNLOCKED)
|
|
* @starget: target whose devices we want to iterate over.
|
|
* @data: parameter for callback @fn()
|
|
* @fn: callback function that is invoked for each device
|
|
*
|
|
* 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);
|
|
|
|
/**
|
|
* __scsi_device_lookup_by_target - find a device given the target (UNLOCKED)
|
|
* @starget: SCSI target pointer
|
|
* @lun: SCSI Logical Unit Number
|
|
*
|
|
* Description: Looks up the scsi_device with the specified @lun for a given
|
|
* @starget. 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. A scsi_device in state
|
|
* SDEV_DEL is skipped.
|
|
*
|
|
* Note: The only reason why drivers should use this is because
|
|
* they need to access the device list in irq context. Otherwise you
|
|
* really want to use scsi_device_lookup_by_target instead.
|
|
**/
|
|
struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget,
|
|
u64 lun)
|
|
{
|
|
struct scsi_device *sdev;
|
|
|
|
list_for_each_entry(sdev, &starget->devices, same_target_siblings) {
|
|
if (sdev->sdev_state == SDEV_DEL)
|
|
continue;
|
|
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
|
|
*
|
|
* Description: Looks up the scsi_device with the specified @lun for a given
|
|
* @starget. The returned scsi_device has an additional reference that
|
|
* needs to be released with scsi_device_put once you're done with it.
|
|
**/
|
|
struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget,
|
|
u64 lun)
|
|
{
|
|
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);
|
|
|
|
/**
|
|
* __scsi_device_lookup - find a device given the host (UNLOCKED)
|
|
* @shost: SCSI host pointer
|
|
* @channel: SCSI channel (zero if only one channel)
|
|
* @id: SCSI target number (physical unit number)
|
|
* @lun: SCSI Logical Unit Number
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 scsi_device_lookup instead.
|
|
**/
|
|
struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost,
|
|
uint channel, uint id, u64 lun)
|
|
{
|
|
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
|
|
*
|
|
* 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.
|
|
**/
|
|
struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost,
|
|
uint channel, uint id, u64 lun)
|
|
{
|
|
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);
|
|
|
|
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");
|
|
|
|
bool scsi_use_blk_mq = false;
|
|
module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO);
|
|
|
|
static int __init init_scsi(void)
|
|
{
|
|
int error;
|
|
|
|
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;
|
|
|
|
scsi_netlink_init();
|
|
|
|
printk(KERN_NOTICE "SCSI subsystem initialized\n");
|
|
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\n",
|
|
-error);
|
|
return error;
|
|
}
|
|
|
|
static void __exit exit_scsi(void)
|
|
{
|
|
scsi_netlink_exit();
|
|
scsi_sysfs_unregister();
|
|
scsi_exit_sysctl();
|
|
scsi_exit_hosts();
|
|
scsi_exit_devinfo();
|
|
scsi_exit_procfs();
|
|
scsi_exit_queue();
|
|
async_unregister_domain(&scsi_sd_probe_domain);
|
|
}
|
|
|
|
subsys_initcall(init_scsi);
|
|
module_exit(exit_scsi);
|