Initial import

1 files changed, 1272 insertions, 0 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
new file mode 100644
index 000000000..3833bf59f
--- /dev/null
+++ b/drivers/scsi/scsi.c
@@ -0,0 +1,1272 @@
+/*
+ *  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>
+#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>
+#include <linux/unistd.h>
+#include <linux/spinlock.h>
+#include <linux/kmod.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
+#include <linux/mutex.h>
+#include <linux/async.h>
+#include <asm/unaligned.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+
+#include "scsi_priv.h"
+#include "scsi_logging.h"
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/scsi.h>
+
+/*
+ * Definitions and constants.
+ */
+
+/*
+ * 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
+
+/* sd, scsi core and power management need to coordinate flushing async actions */
+ASYNC_DOMAIN(scsi_sd_probe_domain);
+EXPORT_SYMBOL(scsi_sd_probe_domain);
+
+/*
+ * 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);
+
+/* 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
+ */
+static const char *const scsi_device_types[] = {
+	"Direct-Access    ",
+	"Sequential-Access",
+	"Printer          ",
+	"Processor        ",
+	"WORM             ",
+	"CD-ROM           ",
+	"Scanner          ",
+	"Optical Device   ",
+	"Medium Changer   ",
+	"Communications   ",
+	"ASC IT8          ",
+	"ASC IT8          ",
+	"RAID             ",
+	"Enclosure        ",
+	"Direct-Access-RBC",
+	"Optical card     ",
+	"Bridge controller",
+	"Object storage   ",
+	"Automation/Drive ",
+	"Security Manager ",
+	"Direct-Access-ZBC",
+};
+
+/**
+ * scsi_device_type - Return 17 char string indicating device type.
+ * @type: type number to look up
+ */
+
+const char * scsi_device_type(unsigned type)
+{
+	if (type == 0x1e)
+		return "Well-known LUN   ";
+	if (type == 0x1f)
+		return "No Device        ";
+	if (type >= ARRAY_SIZE(scsi_device_types))
+		return "Unknown          ";
+	return scsi_device_types[type];
+}
+
+EXPORT_SYMBOL(scsi_device_type);
+
+struct scsi_host_cmd_pool {
+	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;
+};
+
+static struct scsi_host_cmd_pool scsi_cmd_pool = {
+	.cmd_name	= "scsi_cmd_cache",
+	.sense_name	= "scsi_sense_cache",
+	.slab_flags	= SLAB_HWCACHE_ALIGN,
+};
+
+static struct scsi_host_cmd_pool scsi_cmd_dma_pool = {
+	.cmd_name	= "scsi_cmd_cache(DMA)",
+	.sense_name	= "scsi_sense_cache(DMA)",
+	.slab_flags	= SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA,
+	.gfp_mask	= __GFP_DMA,
+};
+
+static DEFINE_MUTEX(host_cmd_pool_mutex);
+
+/**
+ * scsi_host_free_command - internal function to release a command
+ * @shost:	host to free the command for
+ * @cmd:	command to release
+ *
+ * the command must previously have been allocated by
+ * scsi_host_alloc_command.
+ */
+static void
+scsi_host_free_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
+{
+	struct scsi_host_cmd_pool *pool = shost->cmd_pool;
+
+	if (cmd->prot_sdb)
+		kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb);
+	kmem_cache_free(pool->sense_slab, cmd->sense_buffer);
+	kmem_cache_free(pool->cmd_slab, cmd);
+}
+
+/**
+ * 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)
+{
+	struct scsi_host_cmd_pool *pool = shost->cmd_pool;
+	struct scsi_cmnd *cmd;
+
+	cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask | pool->gfp_mask);
+	if (!cmd)
+		goto fail;
+
+	cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab,
+					     gfp_mask | pool->gfp_mask);
+	if (!cmd->sense_buffer)
+		goto fail_free_cmd;
+
+	if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) {
+		cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask);
+		if (!cmd->prot_sdb)
+			goto fail_free_sense;
+	}
+
+	return cmd;
+
+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;
+}
+
+/**
+ * __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.
+ */
+static struct scsi_cmnd *
+__scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask)
+{
+	struct scsi_cmnd *cmd = scsi_host_alloc_command(shost, gfp_mask);
+
+	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);
+
+		if (cmd) {
+			void *buf, *prot;
+
+			buf = cmd->sense_buffer;
+			prot = cmd->prot_sdb;
+
+			memset(cmd, 0, sizeof(*cmd));
+
+			cmd->sense_buffer = buf;
+			cmd->prot_sdb = prot;
+		}
+	}
+
+	return cmd;
+}
+
+/**
+ * scsi_get_command - Allocate and setup a scsi command block
+ * @dev: parent scsi device
+ * @gfp_mask: allocator flags
+ *
+ * Returns:	The allocated scsi command structure.
+ */
+struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask)
+{
+	struct scsi_cmnd *cmd = __scsi_get_command(dev->host, gfp_mask);
+	unsigned long flags;
+
+	if (unlikely(cmd == NULL))
+		return NULL;
+
+	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;
+	return cmd;
+}
+
+/**
+ * __scsi_put_command - Free a struct scsi_cmnd
+ * @shost: dev->host
+ * @cmd: Command to free
+ */
+static void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
+{
+	unsigned long flags;
+
+	if (unlikely(list_empty(&shost->free_list))) {
+		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);
+	}
+
+	if (likely(cmd != NULL))
+		scsi_host_free_command(shost, cmd);
+}
+
+/**
+ * scsi_put_command - Free a scsi command block
+ * @cmd: command block to free
+ *
+ * Returns:	Nothing.
+ *
+ * Notes:	The command must not belong to any lists.
+ */
+void scsi_put_command(struct scsi_cmnd *cmd)
+{
+	unsigned long flags;
+
+	/* 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);
+	spin_unlock_irqrestore(&cmd->device->list_lock, flags);
+
+	BUG_ON(delayed_work_pending(&cmd->abort_work));
+
+	__scsi_put_command(cmd->device->host, cmd);
+}
+
+static struct scsi_host_cmd_pool *
+scsi_find_host_cmd_pool(struct Scsi_Host *shost)
+{
+	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;
+
+	pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->proc_name);
+	pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->proc_name);
+	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;
+	}
+
+	if (hostt->cmd_size)
+		hostt->cmd_pool = pool;
+
+	return pool;
+}
+
+static struct scsi_host_cmd_pool *
+scsi_get_host_cmd_pool(struct Scsi_Host *shost)
+{
+	struct scsi_host_template *hostt = shost->hostt;
+	struct scsi_host_cmd_pool *retval = NULL, *pool;
+	size_t cmd_size = sizeof(struct scsi_cmnd) + hostt->cmd_size;
+
+	/*
+	 * Select a command slab for this host and create it if not
+	 * yet existent.
+	 */
+	mutex_lock(&host_cmd_pool_mutex);
+	pool = scsi_find_host_cmd_pool(shost);
+	if (!pool) {
+		pool = scsi_alloc_host_cmd_pool(shost);
+		if (!pool)
+			goto out;
+	}
+
+	if (!pool->users) {
+		pool->cmd_slab = kmem_cache_create(pool->cmd_name, cmd_size, 0,
+						   pool->slab_flags, NULL);
+		if (!pool->cmd_slab)
+			goto out_free_pool;
+
+		pool->sense_slab = kmem_cache_create(pool->sense_name,
+						     SCSI_SENSE_BUFFERSIZE, 0,
+						     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);
+		hostt->cmd_pool = NULL;
+	}
+	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);
+			hostt->cmd_pool = NULL;
+		}
+	}
+	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 + cmd address
+	 *
+	 * 3: same as 2
+	 *
+	 * 4: same as 3
+	 */
+	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: scmd 0x%p\n", cmd);
+			scsi_print_command(cmd);
+		}
+	}
+}
+
+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
+	 *
+	 * 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)) {
+			scsi_print_result(cmd, "Done", disposition);
+			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_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_change_queue_depth - change a device's queue depth
+ * @sdev: SCSI Device in question
+ * @depth: number of commands allowed to be queued to the driver
+ *
+ * Sets the device queue depth and returns the new value.
+ */
+int scsi_change_queue_depth(struct scsi_device *sdev, int depth)
+{
+	unsigned long flags;
+
+	if (depth <= 0)
+		goto out;
+
+	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, depth) != 0)
+			goto out_unlock;
+	}
+
+	sdev->queue_depth = depth;
+out_unlock:
+	spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags);
+out:
+	return sdev->queue_depth;
+}
+EXPORT_SYMBOL(scsi_change_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;
+
+	return scsi_change_queue_depth(sdev, 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.
+ *
+ * This will fail if a device is deleted or cancelled, or when the LLD module
+ * is in the process of being unloaded.
+ */
+int scsi_device_get(struct scsi_device *sdev)
+{
+	if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)
+		goto fail;
+	if (!get_device(&sdev->sdev_gendev))
+		goto fail;
+	if (!try_module_get(sdev->host->hostt->module))
+		goto fail_put_device;
+	return 0;
+
+fail_put_device:
+	put_device(&sdev->sdev_gendev);
+fail:
+	return -ENXIO;
+}
+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)
+{
+	module_put(sdev->host->hostt->module);
+	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");
+
+#ifdef CONFIG_SCSI_MQ_DEFAULT
+bool scsi_use_blk_mq = true;
+#else
+bool scsi_use_blk_mq = false;
+#endif
+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);