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