v4.19.13 snapshot.
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
new file mode 100644
index 0000000..fc1356d
--- /dev/null
+++ b/drivers/scsi/scsi.c
@@ -0,0 +1,846 @@
+/*
+ * 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);
+
+/**
+ * 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)
+{
+ scsi_del_cmd_from_list(cmd);
+ BUG_ON(delayed_work_pending(&cmd->abort_work));
+}
+
+#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",
+ scsi_host_busy(cmd->device->host),
+ 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 (!blk_rq_is_passthrough(cmd->request)) {
+ 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)
+{
+ if (depth > 0) {
+ sdev->queue_depth = depth;
+ wmb();
+ }
+
+ if (sdev->request_queue)
+ blk_set_queue_depth(sdev->request_queue, depth);
+
+ 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_get_vpd_buf - Get Vital Product Data from a SCSI device
+ * @sdev: The device to ask
+ * @page: Which Vital Product Data to return
+ *
+ * Returns %NULL upon failure.
+ */
+static struct scsi_vpd *scsi_get_vpd_buf(struct scsi_device *sdev, u8 page)
+{
+ struct scsi_vpd *vpd_buf;
+ int vpd_len = SCSI_VPD_PG_LEN, result;
+
+retry_pg:
+ vpd_buf = kmalloc(sizeof(*vpd_buf) + vpd_len, GFP_KERNEL);
+ if (!vpd_buf)
+ return NULL;
+
+ result = scsi_vpd_inquiry(sdev, vpd_buf->data, page, vpd_len);
+ if (result < 0) {
+ kfree(vpd_buf);
+ return NULL;
+ }
+ if (result > vpd_len) {
+ vpd_len = result;
+ kfree(vpd_buf);
+ goto retry_pg;
+ }
+
+ vpd_buf->len = result;
+
+ return vpd_buf;
+}
+
+static void scsi_update_vpd_page(struct scsi_device *sdev, u8 page,
+ struct scsi_vpd __rcu **sdev_vpd_buf)
+{
+ struct scsi_vpd *vpd_buf;
+
+ vpd_buf = scsi_get_vpd_buf(sdev, page);
+ if (!vpd_buf)
+ return;
+
+ mutex_lock(&sdev->inquiry_mutex);
+ rcu_swap_protected(*sdev_vpd_buf, vpd_buf,
+ lockdep_is_held(&sdev->inquiry_mutex));
+ mutex_unlock(&sdev->inquiry_mutex);
+
+ if (vpd_buf)
+ kfree_rcu(vpd_buf, rcu);
+}
+
+/**
+ * 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 i;
+ struct scsi_vpd *vpd_buf;
+
+ if (!scsi_device_supports_vpd(sdev))
+ return;
+
+ /* Ask for all the pages supported by this device */
+ vpd_buf = scsi_get_vpd_buf(sdev, 0);
+ if (!vpd_buf)
+ return;
+
+ for (i = 4; i < vpd_buf->len; i++) {
+ if (vpd_buf->data[i] == 0x80)
+ scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80);
+ if (vpd_buf->data[i] == 0x83)
+ scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83);
+ }
+ kfree(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->sdev_state == SDEV_DEL)
+ continue;
+ 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);