diff options
Diffstat (limited to 'include/scsi/scsi_device.h')
| -rw-r--r-- | include/scsi/scsi_device.h | 587 |
1 files changed, 587 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h new file mode 100644 index 000000000..202f4d6a4 --- /dev/null +++ b/include/scsi/scsi_device.h @@ -0,0 +1,587 @@ +/* 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/blkdev.h> +#include <scsi/scsi.h> +#include <linux/atomic.h> + +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[]; +}; + +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 */ + + atomic_t device_busy; /* commands actually active on LLDD */ + atomic_t device_blocked; /* Device returned QUEUE_FULL. */ + + spinlock_t list_lock; + struct list_head cmd_list; /* queue of in use SCSI Command structures */ + 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_VPD_PG_LEN 255 + struct scsi_vpd __rcu *vpd_pg83; + struct scsi_vpd __rcu *vpd_pg80; + unsigned char current_tag; /* current tag */ + struct scsi_target *sdev_target; /* used only for single_lun */ + + 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 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 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 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 */ + + 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; + + struct device sdev_gendev, + sdev_dev; + + struct execute_work ew; /* used to get process context on put */ + struct work_struct requeue_work; + + struct scsi_device_handler *handler; + void *handler_data; + + unsigned char access_state; + struct mutex state_mutex; + enum scsi_device_state sdev_state; + struct task_struct *quiesced_by; + unsigned long sdev_data[0]; +} __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 { \ + if ((scmd)->request->rq_disk) \ + sdev_dbg((scmd)->device, "[%s] " fmt, \ + (scmd)->request->rq_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[0]; /* 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); + +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); + +extern int scsi_mode_sense(struct scsi_device *sdev, int dbd, int modepage, + 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, + int modepage, 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); +extern int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, + unsigned int len, unsigned char opcode); +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 *); +extern void scsi_target_block(struct device *); +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); +extern int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, + int data_direction, void *buffer, unsigned bufflen, + unsigned char *sense, struct scsi_sense_hdr *sshdr, + int timeout, int retries, u64 flags, + req_flags_t rq_flags, int *resid); +/* Make sure any sense buffer is the correct size. */ +#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense, \ + sshdr, timeout, retries, flags, rq_flags, resid) \ +({ \ + BUILD_BUG_ON((sense) != NULL && \ + sizeof(sense) != SCSI_SENSE_BUFFERSIZE); \ + __scsi_execute(sdev, cmd, data_direction, buffer, bufflen, \ + sense, sshdr, timeout, retries, flags, rq_flags, \ + resid); \ +}) +static inline int scsi_execute_req(struct scsi_device *sdev, + const unsigned char *cmd, int data_direction, void *buffer, + unsigned bufflen, struct scsi_sense_hdr *sshdr, int timeout, + int retries, int *resid) +{ + return scsi_execute(sdev, cmd, data_direction, buffer, + bufflen, NULL, sshdr, timeout, retries, 0, 0, resid); +} +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; +} + +#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 */ |