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linux/include/scsi/scsi_device.h
Damien Le Moal 0a85890559 ata,scsi: do not issue START STOP UNIT on resume 
During system resume, ata_port_pm_resume() triggers ata EH to
1) Resume the controller
2) Reset and rescan the ports
3) Revalidate devices
This EH execution is started asynchronously from ata_port_pm_resume(),
which means that when sd_resume() is executed, none or only part of the
above processing may have been executed. However, sd_resume() issues a
START STOP UNIT to wake up the drive from sleep mode. This command is
translated to ATA with ata_scsi_start_stop_xlat() and issued to the
device. However, depending on the state of execution of the EH process
and revalidation triggerred by ata_port_pm_resume(), two things may
happen:
1) The START STOP UNIT fails if it is received before the controller has
   been reenabled at the beginning of the EH execution. This is visible
   with error messages like:

ata10.00: device reported invalid CHS sector 0
sd 9:0:0:0: [sdc] Start/Stop Unit failed: Result: hostbyte=DID_OK driverbyte=DRIVER_OK
sd 9:0:0:0: [sdc] Sense Key : Illegal Request [current]
sd 9:0:0:0: [sdc] Add. Sense: Unaligned write command
sd 9:0:0:0: PM: dpm_run_callback(): scsi_bus_resume+0x0/0x90 returns -5
sd 9:0:0:0: PM: failed to resume async: error -5

2) The START STOP UNIT command is received while the EH process is
   on-going, which mean that it is stopped and must wait for its
   completion, at which point the command is rather useless as the drive
   is already fully spun up already. This case results also in a
   significant delay in sd_resume() which is observable by users as
   the entire system resume completion is delayed.

Given that ATA devices will be woken up by libata activity on resume,
sd_resume() has no need to issue a START STOP UNIT command, which solves
the above mentioned problems. Do not issue this command by introducing
the new scsi_device flag no_start_on_resume and setting this flag to 1
in ata_scsi_dev_config(). sd_resume() is modified to issue a START STOP
UNIT command only if this flag is not set.

Reported-by: Paul Ausbeck <paula@soe.ucsc.edu>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=215880
Fixes: a19a93e4c6 ("scsi: core: pm: Rely on the device driver core for async power management")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Tested-by: Tanner Watkins <dalzot@gmail.com>
Tested-by: Paul Ausbeck <paula@soe.ucsc.edu>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
2023-08-02 17:01:12 +09:00

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SCSI_SCSI_DEVICE_H
#define _SCSI_SCSI_DEVICE_H
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/blk-mq.h>
#include <scsi/scsi.h>
#include <linux/atomic.h>
#include <linux/sbitmap.h>
struct bsg_device;
struct device;
struct request_queue;
struct scsi_cmnd;
struct scsi_lun;
struct scsi_sense_hdr;
typedef __u64 __bitwise blist_flags_t;
#define SCSI_SENSE_BUFFERSIZE 96
struct scsi_mode_data {
__u32 length;
__u16 block_descriptor_length;
__u8 medium_type;
__u8 device_specific;
__u8 header_length;
__u8 longlba:1;
};
/*
* sdev state: If you alter this, you also need to alter scsi_sysfs.c
* (for the ascii descriptions) and the state model enforcer:
* scsi_lib:scsi_device_set_state().
*/
enum scsi_device_state {
SDEV_CREATED = 1, /* device created but not added to sysfs
* Only internal commands allowed (for inq) */
SDEV_RUNNING, /* device properly configured
* All commands allowed */
SDEV_CANCEL, /* beginning to delete device
* Only error handler commands allowed */
SDEV_DEL, /* device deleted
* no commands allowed */
SDEV_QUIESCE, /* Device quiescent. No block commands
* will be accepted, only specials (which
* originate in the mid-layer) */
SDEV_OFFLINE, /* Device offlined (by error handling or
* user request */
SDEV_TRANSPORT_OFFLINE, /* Offlined by transport class error handler */
SDEV_BLOCK, /* Device blocked by scsi lld. No
* scsi commands from user or midlayer
* should be issued to the scsi
* lld. */
SDEV_CREATED_BLOCK, /* same as above but for created devices */
};
enum scsi_scan_mode {
SCSI_SCAN_INITIAL = 0,
SCSI_SCAN_RESCAN,
SCSI_SCAN_MANUAL,
};
enum scsi_device_event {
SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */
SDEV_EVT_INQUIRY_CHANGE_REPORTED, /* 3F 03 UA reported */
SDEV_EVT_CAPACITY_CHANGE_REPORTED, /* 2A 09 UA reported */
SDEV_EVT_SOFT_THRESHOLD_REACHED_REPORTED, /* 38 07 UA reported */
SDEV_EVT_MODE_PARAMETER_CHANGE_REPORTED, /* 2A 01 UA reported */
SDEV_EVT_LUN_CHANGE_REPORTED, /* 3F 0E UA reported */
SDEV_EVT_ALUA_STATE_CHANGE_REPORTED, /* 2A 06 UA reported */
SDEV_EVT_POWER_ON_RESET_OCCURRED, /* 29 00 UA reported */
SDEV_EVT_FIRST = SDEV_EVT_MEDIA_CHANGE,
SDEV_EVT_LAST = SDEV_EVT_POWER_ON_RESET_OCCURRED,
SDEV_EVT_MAXBITS = SDEV_EVT_LAST + 1
};
struct scsi_event {
enum scsi_device_event evt_type;
struct list_head node;
/* put union of data structures, for non-simple event types,
* here
*/
};
/**
* struct scsi_vpd - SCSI Vital Product Data
* @rcu: For kfree_rcu().
* @len: Length in bytes of @data.
* @data: VPD data as defined in various T10 SCSI standard documents.
*/
struct scsi_vpd {
struct rcu_head rcu;
int len;
unsigned char data[];
};
enum scsi_vpd_parameters {
SCSI_VPD_HEADER_SIZE = 4,
};
struct scsi_device {
struct Scsi_Host *host;
struct request_queue *request_queue;
/* the next two are protected by the host->host_lock */
struct list_head siblings; /* list of all devices on this host */
struct list_head same_target_siblings; /* just the devices sharing same target id */
struct sbitmap budget_map;
atomic_t device_blocked; /* Device returned QUEUE_FULL. */
atomic_t restarts;
spinlock_t list_lock;
struct list_head starved_entry;
unsigned short queue_depth; /* How deep of a queue we want */
unsigned short max_queue_depth; /* max queue depth */
unsigned short last_queue_full_depth; /* These two are used by */
unsigned short last_queue_full_count; /* scsi_track_queue_full() */
unsigned long last_queue_full_time; /* last queue full time */
unsigned long queue_ramp_up_period; /* ramp up period in jiffies */
#define SCSI_DEFAULT_RAMP_UP_PERIOD (120 * HZ)
unsigned long last_queue_ramp_up; /* last queue ramp up time */
unsigned int id, channel;
u64 lun;
unsigned int manufacturer; /* Manufacturer of device, for using
* vendor-specific cmd's */
unsigned sector_size; /* size in bytes */
void *hostdata; /* available to low-level driver */
unsigned char type;
char scsi_level;
char inq_periph_qual; /* PQ from INQUIRY data */
struct mutex inquiry_mutex;
unsigned char inquiry_len; /* valid bytes in 'inquiry' */
unsigned char * inquiry; /* INQUIRY response data */
const char * vendor; /* [back_compat] point into 'inquiry' ... */
const char * model; /* ... after scan; point to static string */
const char * rev; /* ... "nullnullnullnull" before scan */
#define SCSI_DEFAULT_VPD_LEN 255 /* default SCSI VPD page size (max) */
struct scsi_vpd __rcu *vpd_pg0;
struct scsi_vpd __rcu *vpd_pg83;
struct scsi_vpd __rcu *vpd_pg80;
struct scsi_vpd __rcu *vpd_pg89;
struct scsi_vpd __rcu *vpd_pgb0;
struct scsi_vpd __rcu *vpd_pgb1;
struct scsi_vpd __rcu *vpd_pgb2;
struct scsi_target *sdev_target;
blist_flags_t sdev_bflags; /* black/white flags as also found in
* scsi_devinfo.[hc]. For now used only to
* pass settings from slave_alloc to scsi
* core. */
unsigned int eh_timeout; /* Error handling timeout */
unsigned removable:1;
unsigned changed:1; /* Data invalid due to media change */
unsigned busy:1; /* Used to prevent races */
unsigned lockable:1; /* Able to prevent media removal */
unsigned locked:1; /* Media removal disabled */
unsigned borken:1; /* Tell the Seagate driver to be
* painfully slow on this device */
unsigned disconnect:1; /* can disconnect */
unsigned soft_reset:1; /* Uses soft reset option */
unsigned sdtr:1; /* Device supports SDTR messages */
unsigned wdtr:1; /* Device supports WDTR messages */
unsigned ppr:1; /* Device supports PPR messages */
unsigned tagged_supported:1; /* Supports SCSI-II tagged queuing */
unsigned simple_tags:1; /* simple queue tag messages are enabled */
unsigned was_reset:1; /* There was a bus reset on the bus for
* this device */
unsigned expecting_cc_ua:1; /* Expecting a CHECK_CONDITION/UNIT_ATTN
* because we did a bus reset. */
unsigned use_10_for_rw:1; /* first try 10-byte read / write */
unsigned use_10_for_ms:1; /* first try 10-byte mode sense/select */
unsigned set_dbd_for_ms:1; /* Set "DBD" field in mode sense */
unsigned no_report_opcodes:1; /* no REPORT SUPPORTED OPERATION CODES */
unsigned no_write_same:1; /* no WRITE SAME command */
unsigned use_16_for_rw:1; /* Use read/write(16) over read/write(10) */
unsigned use_16_for_sync:1; /* Use sync (16) over sync (10) */
unsigned skip_ms_page_8:1; /* do not use MODE SENSE page 0x08 */
unsigned skip_ms_page_3f:1; /* do not use MODE SENSE page 0x3f */
unsigned skip_vpd_pages:1; /* do not read VPD pages */
unsigned try_vpd_pages:1; /* attempt to read VPD pages */
unsigned use_192_bytes_for_3f:1; /* ask for 192 bytes from page 0x3f */
unsigned no_start_on_add:1; /* do not issue start on add */
unsigned allow_restart:1; /* issue START_UNIT in error handler */
unsigned manage_start_stop:1; /* Let HLD (sd) manage start/stop */
unsigned no_start_on_resume:1; /* Do not issue START_STOP_UNIT on resume */
unsigned start_stop_pwr_cond:1; /* Set power cond. in START_STOP_UNIT */
unsigned no_uld_attach:1; /* disable connecting to upper level drivers */
unsigned select_no_atn:1;
unsigned fix_capacity:1; /* READ_CAPACITY is too high by 1 */
unsigned guess_capacity:1; /* READ_CAPACITY might be too high by 1 */
unsigned retry_hwerror:1; /* Retry HARDWARE_ERROR */
unsigned last_sector_bug:1; /* do not use multisector accesses on
SD_LAST_BUGGY_SECTORS */
unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
unsigned try_rc_10_first:1; /* Try READ_CAPACACITY_10 first */
unsigned security_supported:1; /* Supports Security Protocols */
unsigned is_visible:1; /* is the device visible in sysfs */
unsigned wce_default_on:1; /* Cache is ON by default */
unsigned no_dif:1; /* T10 PI (DIF) should be disabled */
unsigned broken_fua:1; /* Don't set FUA bit */
unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */
unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */
unsigned rpm_autosuspend:1; /* Enable runtime autosuspend at device
* creation time */
unsigned ignore_media_change:1; /* Ignore MEDIA CHANGE on resume */
unsigned silence_suspend:1; /* Do not print runtime PM related messages */
unsigned no_vpd_size:1; /* No VPD size reported in header */
unsigned cdl_supported:1; /* Command duration limits supported */
unsigned cdl_enable:1; /* Enable/disable Command duration limits */
unsigned int queue_stopped; /* request queue is quiesced */
bool offline_already; /* Device offline message logged */
atomic_t disk_events_disable_depth; /* disable depth for disk events */
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
DECLARE_BITMAP(pending_events, SDEV_EVT_MAXBITS); /* pending events */
struct list_head event_list; /* asserted events */
struct work_struct event_work;
unsigned int max_device_blocked; /* what device_blocked counts down from */
#define SCSI_DEFAULT_DEVICE_BLOCKED 3
atomic_t iorequest_cnt;
atomic_t iodone_cnt;
atomic_t ioerr_cnt;
atomic_t iotmo_cnt;
struct device sdev_gendev,
sdev_dev;
struct work_struct requeue_work;
struct scsi_device_handler *handler;
void *handler_data;
size_t dma_drain_len;
void *dma_drain_buf;
unsigned int sg_timeout;
unsigned int sg_reserved_size;
struct bsg_device *bsg_dev;
unsigned char access_state;
struct mutex state_mutex;
enum scsi_device_state sdev_state;
struct task_struct *quiesced_by;
unsigned long sdev_data[];
} __attribute__((aligned(sizeof(unsigned long))));
#define to_scsi_device(d) \
container_of(d, struct scsi_device, sdev_gendev)
#define class_to_sdev(d) \
container_of(d, struct scsi_device, sdev_dev)
#define transport_class_to_sdev(class_dev) \
to_scsi_device(class_dev->parent)
#define sdev_dbg(sdev, fmt, a...) \
dev_dbg(&(sdev)->sdev_gendev, fmt, ##a)
/*
* like scmd_printk, but the device name is passed in
* as a string pointer
*/
__printf(4, 5) void
sdev_prefix_printk(const char *, const struct scsi_device *, const char *,
const char *, ...);
#define sdev_printk(l, sdev, fmt, a...) \
sdev_prefix_printk(l, sdev, NULL, fmt, ##a)
__printf(3, 4) void
scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
#define scmd_dbg(scmd, fmt, a...) \
do { \
struct request *__rq = scsi_cmd_to_rq((scmd)); \
\
if (__rq->q->disk) \
sdev_dbg((scmd)->device, "[%s] " fmt, \
__rq->q->disk->disk_name, ##a); \
else \
sdev_dbg((scmd)->device, fmt, ##a); \
} while (0)
enum scsi_target_state {
STARGET_CREATED = 1,
STARGET_RUNNING,
STARGET_REMOVE,
STARGET_CREATED_REMOVE,
STARGET_DEL,
};
/*
* scsi_target: representation of a scsi target, for now, this is only
* used for single_lun devices. If no one has active IO to the target,
* starget_sdev_user is NULL, else it points to the active sdev.
*/
struct scsi_target {
struct scsi_device *starget_sdev_user;
struct list_head siblings;
struct list_head devices;
struct device dev;
struct kref reap_ref; /* last put renders target invisible */
unsigned int channel;
unsigned int id; /* target id ... replace
* scsi_device.id eventually */
unsigned int create:1; /* signal that it needs to be added */
unsigned int single_lun:1; /* Indicates we should only
* allow I/O to one of the luns
* for the device at a time. */
unsigned int pdt_1f_for_no_lun:1; /* PDT = 0x1f
* means no lun present. */
unsigned int no_report_luns:1; /* Don't use
* REPORT LUNS for scanning. */
unsigned int expecting_lun_change:1; /* A device has reported
* a 3F/0E UA, other devices on
* the same target will also. */
/* commands actually active on LLD. */
atomic_t target_busy;
atomic_t target_blocked;
/*
* LLDs should set this in the slave_alloc host template callout.
* If set to zero then there is not limit.
*/
unsigned int can_queue;
unsigned int max_target_blocked;
#define SCSI_DEFAULT_TARGET_BLOCKED 3
char scsi_level;
enum scsi_target_state state;
void *hostdata; /* available to low-level driver */
unsigned long starget_data[]; /* for the transport */
/* starget_data must be the last element!!!! */
} __attribute__((aligned(sizeof(unsigned long))));
#define to_scsi_target(d) container_of(d, struct scsi_target, dev)
static inline struct scsi_target *scsi_target(struct scsi_device *sdev)
{
return to_scsi_target(sdev->sdev_gendev.parent);
}
#define transport_class_to_starget(class_dev) \
to_scsi_target(class_dev->parent)
#define starget_printk(prefix, starget, fmt, a...) \
dev_printk(prefix, &(starget)->dev, fmt, ##a)
extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
uint, uint, u64, void *hostdata);
extern int scsi_add_device(struct Scsi_Host *host, uint channel,
uint target, u64 lun);
extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
extern void scsi_remove_device(struct scsi_device *);
extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
void scsi_attach_vpd(struct scsi_device *sdev);
void scsi_cdl_check(struct scsi_device *sdev);
int scsi_cdl_enable(struct scsi_device *sdev, bool enable);
extern struct scsi_device *scsi_device_from_queue(struct request_queue *q);
extern int __must_check scsi_device_get(struct scsi_device *);
extern void scsi_device_put(struct scsi_device *);
extern struct scsi_device *scsi_device_lookup(struct Scsi_Host *,
uint, uint, u64);
extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
uint, uint, u64);
extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
u64);
extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
u64);
extern void starget_for_each_device(struct scsi_target *, void *,
void (*fn)(struct scsi_device *, void *));
extern void __starget_for_each_device(struct scsi_target *, void *,
void (*fn)(struct scsi_device *,
void *));
/* only exposed to implement shost_for_each_device */
extern struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *,
struct scsi_device *);
/**
* shost_for_each_device - iterate over all devices of a host
* @sdev: the &struct scsi_device to use as a cursor
* @shost: the &struct scsi_host to iterate over
*
* Iterator that returns each device attached to @shost. This loop
* takes a reference on each device and releases it at the end. If
* you break out of the loop, you must call scsi_device_put(sdev).
*/
#define shost_for_each_device(sdev, shost) \
for ((sdev) = __scsi_iterate_devices((shost), NULL); \
(sdev); \
(sdev) = __scsi_iterate_devices((shost), (sdev)))
/**
* __shost_for_each_device - iterate over all devices of a host (UNLOCKED)
* @sdev: the &struct scsi_device to use as a cursor
* @shost: the &struct scsi_host to iterate over
*
* Iterator that returns each device attached to @shost. 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 to use this is because you need to access the
* device list in interrupt context. Otherwise you really want to use
* shost_for_each_device instead.
*/
#define __shost_for_each_device(sdev, shost) \
list_for_each_entry((sdev), &((shost)->__devices), siblings)
extern int scsi_change_queue_depth(struct scsi_device *, int);
extern int scsi_track_queue_full(struct scsi_device *, int);
extern int scsi_set_medium_removal(struct scsi_device *, char);
int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage,
int subpage, unsigned char *buffer, int len, int timeout,
int retries, struct scsi_mode_data *data,
struct scsi_sense_hdr *);
extern int scsi_mode_select(struct scsi_device *sdev, int pf, int sp,
unsigned char *buffer, int len, int timeout,
int retries, struct scsi_mode_data *data,
struct scsi_sense_hdr *);
extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
int retries, struct scsi_sense_hdr *sshdr);
extern int scsi_get_vpd_page(struct scsi_device *, u8 page, unsigned char *buf,
int buf_len);
int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer,
unsigned int len, unsigned char opcode,
unsigned short sa);
extern int scsi_device_set_state(struct scsi_device *sdev,
enum scsi_device_state state);
extern struct scsi_event *sdev_evt_alloc(enum scsi_device_event evt_type,
gfp_t gfpflags);
extern void sdev_evt_send(struct scsi_device *sdev, struct scsi_event *evt);
extern void sdev_evt_send_simple(struct scsi_device *sdev,
enum scsi_device_event evt_type, gfp_t gfpflags);
extern int scsi_device_quiesce(struct scsi_device *sdev);
extern void scsi_device_resume(struct scsi_device *sdev);
extern void scsi_target_quiesce(struct scsi_target *);
extern void scsi_target_resume(struct scsi_target *);
extern void scsi_scan_target(struct device *parent, unsigned int channel,
unsigned int id, u64 lun,
enum scsi_scan_mode rescan);
extern void scsi_target_reap(struct scsi_target *);
void scsi_block_targets(struct Scsi_Host *shost, struct device *dev);
extern void scsi_target_unblock(struct device *, enum scsi_device_state);
extern void scsi_remove_target(struct device *);
extern const char *scsi_device_state_name(enum scsi_device_state);
extern int scsi_is_sdev_device(const struct device *);
extern int scsi_is_target_device(const struct device *);
extern void scsi_sanitize_inquiry_string(unsigned char *s, int len);
/* Optional arguments to scsi_execute_cmd */
struct scsi_exec_args {
unsigned char *sense; /* sense buffer */
unsigned int sense_len; /* sense buffer len */
struct scsi_sense_hdr *sshdr; /* decoded sense header */
blk_mq_req_flags_t req_flags; /* BLK_MQ_REQ flags */
int scmd_flags; /* SCMD flags */
int *resid; /* residual length */
};
int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
blk_opf_t opf, void *buffer, unsigned int bufflen,
int timeout, int retries,
const struct scsi_exec_args *args);
extern void sdev_disable_disk_events(struct scsi_device *sdev);
extern void sdev_enable_disk_events(struct scsi_device *sdev);
extern int scsi_vpd_lun_id(struct scsi_device *, char *, size_t);
extern int scsi_vpd_tpg_id(struct scsi_device *, int *);
#ifdef CONFIG_PM
extern int scsi_autopm_get_device(struct scsi_device *);
extern void scsi_autopm_put_device(struct scsi_device *);
#else
static inline int scsi_autopm_get_device(struct scsi_device *d) { return 0; }
static inline void scsi_autopm_put_device(struct scsi_device *d) {}
#endif /* CONFIG_PM */
static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
{
return device_reprobe(&sdev->sdev_gendev);
}
static inline unsigned int sdev_channel(struct scsi_device *sdev)
{
return sdev->channel;
}
static inline unsigned int sdev_id(struct scsi_device *sdev)
{
return sdev->id;
}
#define scmd_id(scmd) sdev_id((scmd)->device)
#define scmd_channel(scmd) sdev_channel((scmd)->device)
/*
* checks for positions of the SCSI state machine
*/
static inline int scsi_device_online(struct scsi_device *sdev)
{
return (sdev->sdev_state != SDEV_OFFLINE &&
sdev->sdev_state != SDEV_TRANSPORT_OFFLINE &&
sdev->sdev_state != SDEV_DEL);
}
static inline int scsi_device_blocked(struct scsi_device *sdev)
{
return sdev->sdev_state == SDEV_BLOCK ||
sdev->sdev_state == SDEV_CREATED_BLOCK;
}
static inline int scsi_device_created(struct scsi_device *sdev)
{
return sdev->sdev_state == SDEV_CREATED ||
sdev->sdev_state == SDEV_CREATED_BLOCK;
}
int scsi_internal_device_block_nowait(struct scsi_device *sdev);
int scsi_internal_device_unblock_nowait(struct scsi_device *sdev,
enum scsi_device_state new_state);
/* accessor functions for the SCSI parameters */
static inline int scsi_device_sync(struct scsi_device *sdev)
{
return sdev->sdtr;
}
static inline int scsi_device_wide(struct scsi_device *sdev)
{
return sdev->wdtr;
}
static inline int scsi_device_dt(struct scsi_device *sdev)
{
return sdev->ppr;
}
static inline int scsi_device_dt_only(struct scsi_device *sdev)
{
if (sdev->inquiry_len < 57)
return 0;
return (sdev->inquiry[56] & 0x0c) == 0x04;
}
static inline int scsi_device_ius(struct scsi_device *sdev)
{
if (sdev->inquiry_len < 57)
return 0;
return sdev->inquiry[56] & 0x01;
}
static inline int scsi_device_qas(struct scsi_device *sdev)
{
if (sdev->inquiry_len < 57)
return 0;
return sdev->inquiry[56] & 0x02;
}
static inline int scsi_device_enclosure(struct scsi_device *sdev)
{
return sdev->inquiry ? (sdev->inquiry[6] & (1<<6)) : 1;
}
static inline int scsi_device_protection(struct scsi_device *sdev)
{
if (sdev->no_dif)
return 0;
return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<0);
}
static inline int scsi_device_tpgs(struct scsi_device *sdev)
{
return sdev->inquiry ? (sdev->inquiry[5] >> 4) & 0x3 : 0;
}
/**
* scsi_device_supports_vpd - test if a device supports VPD pages
* @sdev: the &struct scsi_device to test
*
* If the 'try_vpd_pages' flag is set it takes precedence.
* Otherwise we will assume VPD pages are supported if the
* SCSI level is at least SPC-3 and 'skip_vpd_pages' is not set.
*/
static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
{
/* Attempt VPD inquiry if the device blacklist explicitly calls
* for it.
*/
if (sdev->try_vpd_pages)
return 1;
/*
* Although VPD inquiries can go to SCSI-2 type devices,
* some USB ones crash on receiving them, and the pages
* we currently ask for are mandatory for SPC-2 and beyond
*/
if (sdev->scsi_level >= SCSI_SPC_2 && !sdev->skip_vpd_pages)
return 1;
return 0;
}
static inline int scsi_device_busy(struct scsi_device *sdev)
{
return sbitmap_weight(&sdev->budget_map);
}
#define MODULE_ALIAS_SCSI_DEVICE(type) \
MODULE_ALIAS("scsi:t-" __stringify(type) "*")
#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
#endif /* _SCSI_SCSI_DEVICE_H */
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