| #ifndef _SCSI_SCSI_DEVICE_H |
| #define _SCSI_SCSI_DEVICE_H |
| |
| #include <linux/device.h> |
| #include <linux/list.h> |
| #include <linux/spinlock.h> |
| #include <linux/workqueue.h> |
| #include <linux/blkdev.h> |
| #include <scsi/scsi.h> |
| #include <asm/atomic.h> |
| |
| struct request_queue; |
| struct scsi_cmnd; |
| struct scsi_lun; |
| struct scsi_sense_hdr; |
| |
| 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_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_device_event { |
| SDEV_EVT_MEDIA_CHANGE = 1, /* media has changed */ |
| |
| SDEV_EVT_LAST = SDEV_EVT_MEDIA_CHANGE, |
| 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_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 */ |
| |
| /* this is now protected by the request_queue->queue_lock */ |
| unsigned int device_busy; /* commands actually active on |
| * low-level. protected by queue_lock. */ |
| spinlock_t list_lock; |
| struct list_head cmd_list; /* queue of in use SCSI Command structures */ |
| struct list_head starved_entry; |
| struct scsi_cmnd *current_cmnd; /* currently active command */ |
| unsigned short queue_depth; /* How deep of a queue we want */ |
| 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;/* don't let QUEUE_FULLs on the same |
| jiffie count on our counter, they |
| could all be from the same event. */ |
| |
| unsigned int id, lun, channel; |
| |
| 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 */ |
| char type; |
| char scsi_level; |
| char inq_periph_qual; /* PQ from INQUIRY data */ |
| 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 */ |
| unsigned char current_tag; /* current tag */ |
| struct scsi_target *sdev_target; /* used only for single_lun */ |
| |
| unsigned int 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 writeable:1; |
| 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 ordered_tags:1;/* ordered 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 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 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 */ |
| |
| DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */ |
| struct list_head event_list; /* asserted events */ |
| struct work_struct event_work; |
| |
| unsigned int device_blocked; /* Device returned QUEUE_FULL. */ |
| |
| 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 scsi_dh_data *scsi_dh_data; |
| enum scsi_device_state sdev_state; |
| unsigned long sdev_data[0]; |
| } __attribute__((aligned(sizeof(unsigned long)))); |
| |
| struct scsi_dh_devlist { |
| char *vendor; |
| char *model; |
| }; |
| |
| struct scsi_device_handler { |
| /* Used by the infrastructure */ |
| struct list_head list; /* list of scsi_device_handlers */ |
| |
| /* Filled by the hardware handler */ |
| struct module *module; |
| const char *name; |
| const struct scsi_dh_devlist *devlist; |
| int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *); |
| int (*attach)(struct scsi_device *); |
| void (*detach)(struct scsi_device *); |
| int (*activate)(struct scsi_device *); |
| int (*prep_fn)(struct scsi_device *, struct request *); |
| }; |
| |
| struct scsi_dh_data { |
| struct scsi_device_handler *scsi_dh; |
| char buf[0]; |
| }; |
| |
| #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_printk(prefix, sdev, fmt, a...) \ |
| dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a) |
| |
| #define scmd_printk(prefix, scmd, fmt, a...) \ |
| (scmd)->request->rq_disk ? \ |
| sdev_printk(prefix, (scmd)->device, "[%s] " fmt, \ |
| (scmd)->request->rq_disk->disk_name, ##a) : \ |
| sdev_printk(prefix, (scmd)->device, fmt, ##a) |
| |
| enum scsi_target_state { |
| STARGET_CREATED = 1, |
| STARGET_RUNNING, |
| 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; |
| unsigned int reap_ref; /* protected by the host lock */ |
| 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; /* PDT = 0x1f */ |
| /* means no lun present */ |
| /* commands actually active on LLD. protected by host lock. */ |
| unsigned int target_busy; |
| /* |
| * 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 target_blocked; |
| unsigned int max_target_blocked; |
| #define SCSI_DEFAULT_TARGET_BLOCKED 3 |
| |
| char scsi_level; |
| struct execute_work ew; |
| 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, uint, void *hostdata); |
| extern int scsi_add_device(struct Scsi_Host *host, uint channel, |
| uint target, uint 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); |
| |
| extern int 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, uint); |
| extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *, |
| uint, uint, uint); |
| extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *, |
| uint); |
| extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *, |
| uint); |
| 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 void scsi_adjust_queue_depth(struct scsi_device *, int, 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 unsigned char *scsi_get_vpd_page(struct scsi_device *, u8 page); |
| 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, unsigned int lun, int rescan); |
| extern void scsi_target_reap(struct scsi_target *); |
| extern void scsi_target_block(struct device *); |
| extern void scsi_target_unblock(struct device *); |
| extern void scsi_remove_target(struct device *); |
| extern void int_to_scsilun(unsigned int, struct scsi_lun *); |
| extern int scsilun_to_int(struct scsi_lun *); |
| 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 int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, |
| int data_direction, void *buffer, unsigned bufflen, |
| unsigned char *sense, int timeout, int retries, |
| int flag, int *resid); |
| extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd, |
| int data_direction, void *buffer, unsigned bufflen, |
| struct scsi_sense_hdr *, int timeout, int retries, |
| int *resid); |
| extern int scsi_execute_async(struct scsi_device *sdev, |
| const unsigned char *cmd, int cmd_len, int data_direction, |
| void *buffer, unsigned bufflen, int use_sg, |
| int timeout, int retries, void *privdata, |
| void (*done)(void *, char *, int, int), |
| gfp_t gfp); |
| |
| 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_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; |
| } |
| |
| /* 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[6] & (1<<6); |
| } |
| |
| static inline int scsi_device_protection(struct scsi_device *sdev) |
| { |
| return sdev->scsi_level > SCSI_2 && sdev->inquiry[5] & (1<<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 */ |