cregit-Linux how code gets into the kernel

Release 4.14 drivers/scsi/scsi.c

Directory: drivers/scsi
/*
 *  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)); }

Contributors

PersonTokensPropCommitsCommitProp
James Bottomley830.77%222.22%
Christoph Hellwig830.77%333.33%
Martin K. Petersen519.23%111.11%
FUJITA Tomonori311.54%111.11%
Bart Van Assche13.85%111.11%
Luben Tuikov13.85%111.11%
Total26100.00%9100.00%

#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); } } }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mansfield5291.23%120.00%
Hannes Reinecke23.51%240.00%
Martin K. Petersen23.51%120.00%
Christoph Hellwig11.75%120.00%
Total57100.00%5100.00%


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); } } }

Contributors

PersonTokensPropCommitsCommitProp
Patrick Mansfield10984.50%116.67%
Martin K. Petersen118.53%116.67%
Christoph Hellwig64.65%233.33%
Hannes Reinecke32.33%233.33%
Total129100.00%6100.00%

#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++; }

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PersonTokensPropCommitsCommitProp
Andi Kleen41100.00%1100.00%
Total41100.00%1100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig10849.77%531.25%
Linus Torvalds4420.28%16.25%
Linus Torvalds (pre-git)198.76%318.75%
James Bottomley198.76%16.25%
Mike Christie156.91%16.25%
Jeff Garzik52.30%16.25%
Boaz Harrosh31.38%16.25%
Patrick Mansfield20.92%212.50%
Doug Ledford20.92%16.25%
Total217100.00%16100.00%

/** * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig1938.00%440.00%
Jens Axboe1530.00%110.00%
Doug Ledford1020.00%110.00%
Linus Torvalds (pre-git)510.00%330.00%
Mike Christie12.00%110.00%
Total50100.00%10100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Doug Ledford5461.36%125.00%
Christoph Hellwig2932.95%250.00%
Vasu Dev55.68%125.00%
Total88100.00%4100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Matthew Wilcox12885.33%150.00%
Hannes Reinecke2214.67%150.00%
Total150100.00%2100.00%

/** * 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; }

Contributors

PersonTokensPropCommitsCommitProp
Matthew Wilcox9765.10%120.00%
James Bottomley3422.82%120.00%
Martin K. Petersen117.38%240.00%
Hannes Reinecke74.70%120.00%
Total149100.00%5100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Hannes Reinecke7869.03%250.00%
Bart Van Assche3530.97%250.00%
Total113100.00%4100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Bart Van Assche4654.76%250.00%
Hannes Reinecke3845.24%250.00%
Total84100.00%4100.00%

/** * 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); }

Contributors

PersonTokensPropCommitsCommitProp
Bart Van Assche7769.37%250.00%
Hannes Reinecke3430.63%250.00%
Total111100.00%4100.00%

/** * 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; }

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PersonTokensPropCommitsCommitProp
Martin K. Petersen197100.00%2100.00%
Total197100.00%2100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig6179.22%450.00%
Mike Anderson1012.99%112.50%
James Bottomley45.19%225.00%
Patrick Mansfield22.60%112.50%
Total77100.00%8100.00%

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); }

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PersonTokensPropCommitsCommitProp
Christoph Hellwig1344.83%120.00%
James Bottomley827.59%240.00%
Mike Anderson620.69%120.00%
Rusty Russell26.90%120.00%
Total29100.00%5100.00%

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; }

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PersonTokensPropCommitsCommitProp
Christoph Hellwig10786.29%466.67%
Mike Anderson1310.48%116.67%
James Bottomley43.23%116.67%
Total124100.00%6100.00%

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); } }

Contributors

PersonTokensPropCommitsCommitProp
James Bottomley84100.00%1100.00%
Total84100.00%1100.00%

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); } }

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Maciej W. Rozycki84100.00%1100.00%
Total84100.00%1100.00%

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; }

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James Bottomley4381.13%133.33%
Hannes Reinecke1018.87%266.67%
Total53100.00%3100.00%

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; }

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James Bottomley8098.77%150.00%
Hannes Reinecke11.23%150.00%
Total81100.00%2100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig4969.01%125.00%
Mike Anderson1216.90%125.00%
Zhou Zhengping912.68%125.00%
Hannes Reinecke11.41%125.00%
Total71100.00%4100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig6888.31%133.33%
Mike Anderson810.39%133.33%
Hannes Reinecke11.30%133.33%
Total77100.00%3100.00%

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; }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig9672.18%640.00%
James Bottomley1511.28%16.67%
Linus Torvalds (pre-git)139.77%320.00%
Patrick Mansfield43.01%213.33%
James Smart32.26%16.67%
Mike Anderson10.75%16.67%
Mike Sullivan10.75%16.67%
Total133100.00%15100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig1027.78%538.46%
Linus Torvalds (pre-git)822.22%215.38%
Dan J Williams616.67%17.69%
Patrick Mansfield513.89%215.38%
James Smart38.33%17.69%
Linus Torvalds25.56%17.69%
Mike Anderson25.56%17.69%
Total36100.00%13100.00%

subsys_initcall(init_scsi); module_exit(exit_scsi);

Overall Contributors

PersonTokensPropCommitsCommitProp
Christoph Hellwig66526.00%2823.33%
James Bottomley31512.31%1210.00%
Martin K. Petersen2359.19%65.00%
Matthew Wilcox2308.99%10.83%
Patrick Mansfield2007.82%54.17%
Hannes Reinecke1997.78%86.67%
Bart Van Assche1616.29%32.50%
Linus Torvalds (pre-git)943.67%1815.00%
Maciej W. Rozycki893.48%10.83%
Doug Ledford662.58%21.67%
Linus Torvalds602.35%65.00%
Mike Anderson532.07%32.50%
Andi Kleen411.60%10.83%
Dan J Williams301.17%43.33%
Adrian Bunk220.86%10.83%
Mike Christie160.63%21.67%
Jens Axboe150.59%10.83%
Jeff Garzik100.39%21.67%
Zhou Zhengping90.35%10.83%
Rusty Russell80.31%21.67%
Rob Landley80.31%10.83%
Keiichiro Tokunaga60.23%10.83%
James Smart60.23%10.83%
Vasu Dev50.20%10.83%
Arjan van de Ven30.12%10.83%
Boaz Harrosh30.12%10.83%
FUJITA Tomonori30.12%10.83%
Randy Dunlap20.08%21.67%
Mike Sullivan10.04%10.83%
Bartlomiej Zolnierkiewicz10.04%10.83%
Andrew Morton10.04%10.83%
Luben Tuikov10.04%10.83%
Total2558100.00%120100.00%
Directory: drivers/scsi
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