| #ifndef _SCSI_SCSI_DEVICE_H |
| #define _SCSI_SCSI_DEVICE_H |
| |
| #include <linux/device.h> |
| #include <linux/list.h> |
| #include <linux/spinlock.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. */ |
| }; |
| |
| 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 devfs_name[256]; /* devfs junk */ |
| 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 */ |
| char * vendor; /* [back_compat] point into 'inquiry' ... */ |
| char * model; /* ... after scan; point to static string */ |
| 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 single_lun:1; /* Indicates we should only allow I/O to |
| * one of the luns for the device at a |
| * time. */ |
| 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 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 retry_hwerror:1; /* Retry HARDWARE_ERROR */ |
| |
| 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; |
| |
| int timeout; |
| |
| struct device sdev_gendev; |
| struct class_device sdev_classdev; |
| |
| enum scsi_device_state sdev_state; |
| 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_classdev) |
| #define transport_class_to_sdev(class_dev) \ |
| to_scsi_device(class_dev->dev) |
| |
| #define sdev_printk(prefix, sdev, fmt, a...) \ |
| dev_printk(prefix, &(sdev)->sdev_gendev, fmt, ##a) |
| |
| /* |
| * 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 long create:1; /* signal that it needs to be added */ |
| char scsi_level; |
| 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->dev) |
| |
| #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 void scsi_remove_device(struct scsi_device *); |
| extern int scsi_device_cancel(struct scsi_device *, int); |
| |
| 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 *)); |
| |
| /* 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: iterator |
| * @host: host whiches devices we want to iterate over |
| * |
| * This traverses over each devices of @shost. The devices have |
| * a reference that must be released by scsi_host_put when breaking |
| * out of the loop. |
| */ |
| #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: iterator |
| * @host: host whiches devices we want to iterate over |
| * |
| * This traverses over each devices of @shost. It does _not_ take a |
| * reference on the scsi_device, thus it the whole loop must be protected |
| * by shost->host_lock. |
| * |
| * Note: The only reason why drivers would want to use this is because |
| * they're need to access the device list in irq 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_test_unit_ready(struct scsi_device *sdev, int timeout, |
| int retries); |
| extern int scsi_device_set_state(struct scsi_device *sdev, |
| enum scsi_device_state state); |
| 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 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); |
| 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); |
| |
| static inline int scsi_device_online(struct scsi_device *sdev) |
| { |
| return sdev->sdev_state != SDEV_OFFLINE; |
| } |
| |
| /* 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; |
| } |
| #endif /* _SCSI_SCSI_DEVICE_H */ |