^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * scsi.c Copyright (C) 1992 Drew Eckhardt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2002, 2003 Christoph Hellwig
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * generic mid-level SCSI driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Initial versions: Drew Eckhardt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Subsequent revisions: Eric Youngdale
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * <drew@colorado.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Bug correction thanks go to :
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Rik Faith <faith@cs.unc.edu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Tommy Thorn <tthorn>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * add scatter-gather, multiple outstanding request, and other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * enhancements.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Native multichannel, wide scsi, /proc/scsi and hot plugging
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * support added by Michael Neuffer <mike@i-connect.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Added request_module("scsi_hostadapter") for kerneld:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Bjorn Ekwall <bj0rn@blox.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * (changed to kmod)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * Major improvements to the timeout, abort, and reset processing,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * as well as performance modifications for large queue depths by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * Leonard N. Zubkoff <lnz@dandelion.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * Converted cli() code to spinlocks, Ingo Molnar
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * out_of_space hacks, D. Gilbert (dpg) 990608
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/timer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #include <linux/completion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #include <linux/kmod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #include <linux/notifier.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #include <linux/cpu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #include <linux/async.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #include <asm/unaligned.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) #include <scsi/scsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #include <scsi/scsi_cmnd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #include <scsi/scsi_dbg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #include <scsi/scsi_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) #include <scsi/scsi_driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #include <scsi/scsi_eh.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #include <scsi/scsi_host.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #include <scsi/scsi_tcq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #include "scsi_priv.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #include "scsi_logging.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #define CREATE_TRACE_POINTS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) #include <trace/events/scsi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * Definitions and constants.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * Note - the initial logging level can be set here to log events at boot time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * After the system is up, you may enable logging via the /proc interface.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned int scsi_logging_level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) #if defined(CONFIG_SCSI_LOGGING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) EXPORT_SYMBOL(scsi_logging_level);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * Domain for asynchronous system resume operations. It is marked 'exclusive'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * to avoid being included in the async_synchronize_full() that is invoked by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * dpm_resume().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) EXPORT_SYMBOL(scsi_sd_pm_domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) #ifdef CONFIG_SCSI_LOGGING
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) void scsi_log_send(struct scsi_cmnd *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) unsigned int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * If ML QUEUE log level is greater than or equal to:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) * 1: nothing (match completion)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) * 2: log opcode + command of all commands + cmd address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) * 3: same as 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) * 4: same as 3
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) if (unlikely(scsi_logging_level)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) SCSI_LOG_MLQUEUE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (level > 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) scmd_printk(KERN_INFO, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) "Send: scmd 0x%p\n", cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) scsi_print_command(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) unsigned int level;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) * If ML COMPLETE log level is greater than or equal to:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * 1: log disposition, result, opcode + command, and conditionally
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * sense data for failures or non SUCCESS dispositions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) * 2: same as 1 but for all command completions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) * 3: same as 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * 4: same as 3 plus dump extra junk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) if (unlikely(scsi_logging_level)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) SCSI_LOG_MLCOMPLETE_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (((level > 0) && (cmd->result || disposition != SUCCESS)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) (level > 1)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) scsi_print_result(cmd, "Done", disposition);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) scsi_print_command(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (status_byte(cmd->result) == CHECK_CONDITION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) scsi_print_sense(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (level > 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) scmd_printk(KERN_INFO, cmd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) "scsi host busy %d failed %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) scsi_host_busy(cmd->device->host),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) cmd->device->host->host_failed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) * scsi_finish_command - cleanup and pass command back to upper layer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) * @cmd: the command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) * Description: Pass command off to upper layer for finishing of I/O
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) * request, waking processes that are waiting on results,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) * etc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) void scsi_finish_command(struct scsi_cmnd *cmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct scsi_device *sdev = cmd->device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct scsi_target *starget = scsi_target(sdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct Scsi_Host *shost = sdev->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct scsi_driver *drv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) unsigned int good_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) scsi_device_unbusy(sdev, cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * Clear the flags that say that the device/target/host is no longer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) * capable of accepting new commands.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (atomic_read(&shost->host_blocked))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) atomic_set(&shost->host_blocked, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (atomic_read(&starget->target_blocked))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) atomic_set(&starget->target_blocked, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) if (atomic_read(&sdev->device_blocked))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) atomic_set(&sdev->device_blocked, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * If we have valid sense information, then some kind of recovery
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * must have taken place. Make a note of this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) if (SCSI_SENSE_VALID(cmd))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) cmd->result |= (DRIVER_SENSE << 24);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) "Notifying upper driver of completion "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) "(result %x)\n", cmd->result));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) good_bytes = scsi_bufflen(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) if (!blk_rq_is_passthrough(cmd->request)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) int old_good_bytes = good_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) drv = scsi_cmd_to_driver(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (drv->done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) good_bytes = drv->done(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * USB may not give sense identifying bad sector and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) * simply return a residue instead, so subtract off the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * residue if drv->done() error processing indicates no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * change to the completion length.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) if (good_bytes == old_good_bytes)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) good_bytes -= scsi_get_resid(cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) scsi_io_completion(cmd, good_bytes);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * scsi_change_queue_depth - change a device's queue depth
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * @sdev: SCSI Device in question
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) * @depth: number of commands allowed to be queued to the driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) * Sets the device queue depth and returns the new value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) int scsi_change_queue_depth(struct scsi_device *sdev, int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) if (depth > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) sdev->queue_depth = depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) wmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (sdev->request_queue)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) blk_set_queue_depth(sdev->request_queue, depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return sdev->queue_depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) EXPORT_SYMBOL(scsi_change_queue_depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) * @sdev: SCSI Device in question
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) * @depth: Current number of outstanding SCSI commands on this device,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) * not counting the one returned as QUEUE_FULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) * Description: This function will track successive QUEUE_FULL events on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) * specific SCSI device to determine if and when there is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) * need to adjust the queue depth on the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) * -1 - Drop back to untagged operation using host->cmd_per_lun
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * as the untagged command depth
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * Lock Status: None held on entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) * Notes: Low level drivers may call this at any time and we will do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * "The Right Thing." We are interrupt context safe.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int scsi_track_queue_full(struct scsi_device *sdev, int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * Don't let QUEUE_FULLs on the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) * jiffies count, they could all be from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) * same event.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) sdev->last_queue_full_time = jiffies;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) if (sdev->last_queue_full_depth != depth) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) sdev->last_queue_full_count = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) sdev->last_queue_full_depth = depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) sdev->last_queue_full_count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (sdev->last_queue_full_count <= 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return scsi_change_queue_depth(sdev, depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) EXPORT_SYMBOL(scsi_track_queue_full);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * scsi_vpd_inquiry - Request a device provide us with a VPD page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * @sdev: The device to ask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * @buffer: Where to put the result
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * @page: Which Vital Product Data to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) * @len: The length of the buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) * This is an internal helper function. You probably want to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) * scsi_get_vpd_page instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) * Returns size of the vpd page on success or a negative error number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) u8 page, unsigned len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) unsigned char cmd[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (len < 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) cmd[0] = INQUIRY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) cmd[1] = 1; /* EVPD */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) cmd[2] = page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) cmd[3] = len >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) cmd[4] = len & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) cmd[5] = 0; /* Control byte */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * I'm not convinced we need to try quite this hard to get VPD, but
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) * all the existing users tried this hard.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) len, NULL, 30 * HZ, 3, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) if (result)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) /* Sanity check that we got the page back that we asked for */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (buffer[1] != page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) return get_unaligned_be16(&buffer[2]) + 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) * scsi_get_vpd_page - Get Vital Product Data from a SCSI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) * @sdev: The device to ask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) * @page: Which Vital Product Data to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) * @buf: where to store the VPD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) * @buf_len: number of bytes in the VPD buffer area
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) * SCSI devices may optionally supply Vital Product Data. Each 'page'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) * of VPD is defined in the appropriate SCSI document (eg SPC, SBC).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) * If the device supports this VPD page, this routine returns a pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) * to a buffer containing the data from that page. The caller is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * responsible for calling kfree() on this pointer when it is no longer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * needed. If we cannot retrieve the VPD page this routine returns %NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) int buf_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) int i, result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) if (sdev->skip_vpd_pages)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) /* Ask for all the pages supported by this device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) result = scsi_vpd_inquiry(sdev, buf, 0, buf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (result < 4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) /* If the user actually wanted this page, we can skip the rest */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) if (page == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) for (i = 4; i < min(result, buf_len); i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (buf[i] == page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) if (i < result && i >= buf_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) /* ran off the end of the buffer, give us benefit of doubt */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) goto found;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) /* The device claims it doesn't support the requested page */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) found:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) result = scsi_vpd_inquiry(sdev, buf, page, buf_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) if (result < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) EXPORT_SYMBOL_GPL(scsi_get_vpd_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) * scsi_get_vpd_buf - Get Vital Product Data from a SCSI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * @sdev: The device to ask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * @page: Which Vital Product Data to return
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * Returns %NULL upon failure.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) static struct scsi_vpd *scsi_get_vpd_buf(struct scsi_device *sdev, u8 page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) struct scsi_vpd *vpd_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) int vpd_len = SCSI_VPD_PG_LEN, result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) retry_pg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) vpd_buf = kmalloc(sizeof(*vpd_buf) + vpd_len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (!vpd_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) result = scsi_vpd_inquiry(sdev, vpd_buf->data, page, vpd_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (result < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) kfree(vpd_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) if (result > vpd_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) vpd_len = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) kfree(vpd_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) goto retry_pg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) vpd_buf->len = result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return vpd_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static void scsi_update_vpd_page(struct scsi_device *sdev, u8 page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) struct scsi_vpd __rcu **sdev_vpd_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) struct scsi_vpd *vpd_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) vpd_buf = scsi_get_vpd_buf(sdev, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) if (!vpd_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) mutex_lock(&sdev->inquiry_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) vpd_buf = rcu_replace_pointer(*sdev_vpd_buf, vpd_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) lockdep_is_held(&sdev->inquiry_mutex));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) mutex_unlock(&sdev->inquiry_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) if (vpd_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) kfree_rcu(vpd_buf, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) * @sdev: The device to ask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * Attach the 'Device Identification' VPD page (0x83) and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * 'Unit Serial Number' VPD page (0x80) to a SCSI device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * structure. This information can be used to identify the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) * uniquely.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) void scsi_attach_vpd(struct scsi_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct scsi_vpd *vpd_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (!scsi_device_supports_vpd(sdev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) /* Ask for all the pages supported by this device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) vpd_buf = scsi_get_vpd_buf(sdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) if (!vpd_buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) for (i = 4; i < vpd_buf->len; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) if (vpd_buf->data[i] == 0x0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) scsi_update_vpd_page(sdev, 0x0, &sdev->vpd_pg0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (vpd_buf->data[i] == 0x80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) if (vpd_buf->data[i] == 0x83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) if (vpd_buf->data[i] == 0x89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) kfree(vpd_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * scsi_report_opcode - Find out if a given command opcode is supported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * @sdev: scsi device to query
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * @buffer: scratch buffer (must be at least 20 bytes long)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) * @len: length of buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) * @opcode: opcode for command to look up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * Uses the REPORT SUPPORTED OPERATION CODES to look up the given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) * unsupported and 1 if the device claims to support the command.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) unsigned int len, unsigned char opcode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) unsigned char cmd[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) struct scsi_sense_hdr sshdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) int result;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) memset(cmd, 0, 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) cmd[0] = MAINTENANCE_IN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) cmd[2] = 1; /* One command format */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) cmd[3] = opcode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) put_unaligned_be32(len, &cmd[6]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) memset(buffer, 0, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) &sshdr, 30 * HZ, 3, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (result && scsi_sense_valid(&sshdr) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) sshdr.sense_key == ILLEGAL_REQUEST &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) if ((buffer[1] & 3) == 3) /* Command supported */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) EXPORT_SYMBOL(scsi_report_opcode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) * scsi_device_get - get an additional reference to a scsi_device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) * @sdev: device to get a reference to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) * Description: Gets a reference to the scsi_device and increments the use count
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) * of the underlying LLDD module. You must hold host_lock of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) * parent Scsi_Host or already have a reference when calling this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) * This will fail if a device is deleted or cancelled, or when the LLD module
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) * is in the process of being unloaded.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) int scsi_device_get(struct scsi_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) if (!get_device(&sdev->sdev_gendev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) if (!try_module_get(sdev->host->hostt->module))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) goto fail_put_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) fail_put_device:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) put_device(&sdev->sdev_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) return -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) EXPORT_SYMBOL(scsi_device_get);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) * scsi_device_put - release a reference to a scsi_device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) * @sdev: device to release a reference on.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) * Description: Release a reference to the scsi_device and decrements the use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) * count of the underlying LLDD module. The device is freed once the last
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) * user vanishes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) void scsi_device_put(struct scsi_device *sdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) struct module *mod = sdev->host->hostt->module;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) put_device(&sdev->sdev_gendev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) module_put(mod);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) EXPORT_SYMBOL(scsi_device_put);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) /* helper for shost_for_each_device, see that for documentation */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) struct scsi_device *prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) struct list_head *list = (prev ? &prev->siblings : &shost->__devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) struct scsi_device *next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) spin_lock_irqsave(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) while (list->next != &shost->__devices) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) next = list_entry(list->next, struct scsi_device, siblings);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) /* skip devices that we can't get a reference to */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) if (!scsi_device_get(next))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) next = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) list = list->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) spin_unlock_irqrestore(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) if (prev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) scsi_device_put(prev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) return next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) EXPORT_SYMBOL(__scsi_iterate_devices);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) * starget_for_each_device - helper to walk all devices of a target
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) * @starget: target whose devices we want to iterate over.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) * @data: Opaque passed to each function call.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) * @fn: Function to call on each device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) * This traverses over each device of @starget. The devices have
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) * a reference that must be released by scsi_host_put when breaking
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * out of the loop.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) void starget_for_each_device(struct scsi_target *starget, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) void (*fn)(struct scsi_device *, void *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) shost_for_each_device(sdev, shost) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if ((sdev->channel == starget->channel) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) (sdev->id == starget->id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) fn(sdev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) EXPORT_SYMBOL(starget_for_each_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) * @starget: target whose devices we want to iterate over.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) * @data: parameter for callback @fn()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) * @fn: callback function that is invoked for each device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) * This traverses over each device of @starget. It does _not_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) * take a reference on the scsi_device, so the whole loop must be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) * protected by shost->host_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) * Note: The only reason why drivers would want to use this is because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) * they need to access the device list in irq context. Otherwise you
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) * really want to use starget_for_each_device instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) void __starget_for_each_device(struct scsi_target *starget, void *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) void (*fn)(struct scsi_device *, void *))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) __shost_for_each_device(sdev, shost) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) if ((sdev->channel == starget->channel) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) (sdev->id == starget->id))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) fn(sdev, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) EXPORT_SYMBOL(__starget_for_each_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) * @starget: SCSI target pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) * @lun: SCSI Logical Unit Number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) * Description: Looks up the scsi_device with the specified @lun for a given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) * @starget. The returned scsi_device does not have an additional
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) * reference. You must hold the host's host_lock over this call and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) * any access to the returned scsi_device. A scsi_device in state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) * SDEV_DEL is skipped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) * Note: The only reason why drivers should use this is because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) * they need to access the device list in irq context. Otherwise you
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) * really want to use scsi_device_lookup_by_target instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) u64 lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) list_for_each_entry(sdev, &starget->devices, same_target_siblings) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) if (sdev->sdev_state == SDEV_DEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) if (sdev->lun ==lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) return sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) EXPORT_SYMBOL(__scsi_device_lookup_by_target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) * scsi_device_lookup_by_target - find a device given the target
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) * @starget: SCSI target pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) * @lun: SCSI Logical Unit Number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * Description: Looks up the scsi_device with the specified @lun for a given
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) * @starget. The returned scsi_device has an additional reference that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) * needs to be released with scsi_device_put once you're done with it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) u64 lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) spin_lock_irqsave(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) sdev = __scsi_device_lookup_by_target(starget, lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) if (sdev && scsi_device_get(sdev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) sdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) spin_unlock_irqrestore(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) return sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) EXPORT_SYMBOL(scsi_device_lookup_by_target);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) * __scsi_device_lookup - find a device given the host (UNLOCKED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) * @shost: SCSI host pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) * @channel: SCSI channel (zero if only one channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) * @id: SCSI target number (physical unit number)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) * @lun: SCSI Logical Unit Number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) * Description: Looks up the scsi_device with the specified @channel, @id, @lun
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) * for a given host. The returned scsi_device does not have an additional
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) * reference. You must hold the host's host_lock over this call and any access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) * to the returned scsi_device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) * Note: The only reason why drivers would want to use this is because
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) * they need to access the device list in irq context. Otherwise you
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) * really want to use scsi_device_lookup instead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) uint channel, uint id, u64 lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) list_for_each_entry(sdev, &shost->__devices, siblings) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) if (sdev->sdev_state == SDEV_DEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) if (sdev->channel == channel && sdev->id == id &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) sdev->lun ==lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) return sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) EXPORT_SYMBOL(__scsi_device_lookup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) * scsi_device_lookup - find a device given the host
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) * @shost: SCSI host pointer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) * @channel: SCSI channel (zero if only one channel)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) * @id: SCSI target number (physical unit number)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) * @lun: SCSI Logical Unit Number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) * Description: Looks up the scsi_device with the specified @channel, @id, @lun
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) * for a given host. The returned scsi_device has an additional reference that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) * needs to be released with scsi_device_put once you're done with it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) **/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) uint channel, uint id, u64 lun)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) struct scsi_device *sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) spin_lock_irqsave(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) sdev = __scsi_device_lookup(shost, channel, id, lun);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) if (sdev && scsi_device_get(sdev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) sdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) spin_unlock_irqrestore(shost->host_lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) return sdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) EXPORT_SYMBOL(scsi_device_lookup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) MODULE_DESCRIPTION("SCSI core");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) static int __init init_scsi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) error = scsi_init_procfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) goto cleanup_queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) error = scsi_init_devinfo();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) goto cleanup_procfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) error = scsi_init_hosts();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) goto cleanup_devlist;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) error = scsi_init_sysctl();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) goto cleanup_hosts;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) error = scsi_sysfs_register();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) goto cleanup_sysctl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) scsi_netlink_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) printk(KERN_NOTICE "SCSI subsystem initialized\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) cleanup_sysctl:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) scsi_exit_sysctl();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) cleanup_hosts:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) scsi_exit_hosts();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) cleanup_devlist:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) scsi_exit_devinfo();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) cleanup_procfs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) scsi_exit_procfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) cleanup_queue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) scsi_exit_queue();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) -error);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) static void __exit exit_scsi(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) scsi_netlink_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) scsi_sysfs_unregister();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) scsi_exit_sysctl();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) scsi_exit_hosts();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) scsi_exit_devinfo();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) scsi_exit_procfs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) scsi_exit_queue();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) subsys_initcall(init_scsi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) module_exit(exit_scsi);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags