305 lines
11 KiB
C
305 lines
11 KiB
C
#ifndef _SCSI_SCSI_DEVICE_H
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#define _SCSI_SCSI_DEVICE_H
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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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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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_BLOCK, /* Device blocked by scsi lld. No scsi
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* commands from user or midlayer should be issued
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* to the scsi lld. */
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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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/* this is now protected by the request_queue->queue_lock */
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unsigned int device_busy; /* commands actually active on
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* low-level. protected by queue_lock. */
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spinlock_t list_lock;
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struct list_head cmd_list; /* queue of in use SCSI Command structures */
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struct list_head starved_entry;
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struct scsi_cmnd *current_cmnd; /* currently active command */
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unsigned short queue_depth; /* How deep of a queue we want */
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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;/* don't let QUEUE_FULLs on the same
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jiffie count on our counter, they
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could all be from the same event. */
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unsigned int id, lun, channel;
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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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char devfs_name[256]; /* devfs junk */
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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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unsigned char inquiry_len; /* valid bytes in 'inquiry' */
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unsigned char * inquiry; /* INQUIRY response data */
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char * vendor; /* [back_compat] point into 'inquiry' ... */
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char * model; /* ... after scan; point to static string */
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char * rev; /* ... "nullnullnullnull" before scan */
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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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unsigned int 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 writeable:1;
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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 ordered_tags:1;/* ordered queue tag messages are enabled */
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unsigned single_lun:1; /* Indicates we should only allow I/O to
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* one of the luns for the device at a
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* time. */
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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 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 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 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 retry_hwerror:1; /* Retry HARDWARE_ERROR */
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unsigned int device_blocked; /* Device returned QUEUE_FULL. */
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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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int timeout;
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struct device sdev_gendev;
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struct class_device sdev_classdev;
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enum scsi_device_state sdev_state;
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unsigned long sdev_data[0];
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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_classdev)
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#define transport_class_to_sdev(class_dev) \
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to_scsi_device(class_dev->dev)
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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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unsigned int reap_ref; /* protected by the host lock */
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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 long create:1; /* signal that it needs to be added */
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void *hostdata; /* available to low-level driver */
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unsigned long starget_data[0]; /* 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->dev)
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extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
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uint, uint, uint, void *hostdata);
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extern int scsi_add_device(struct Scsi_Host *host, uint channel,
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uint target, uint lun);
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extern void scsi_remove_device(struct scsi_device *);
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extern int scsi_device_cancel(struct scsi_device *, int);
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extern int 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, uint);
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extern struct scsi_device *__scsi_device_lookup(struct Scsi_Host *,
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uint, uint, uint);
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extern struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *,
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uint);
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extern struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *,
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uint);
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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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/* 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: iterator
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* @host: host whiches devices we want to iterate over
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*
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* This traverses over each devices of @shost. The devices have
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* a reference that must be released by scsi_host_put when breaking
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* out of the loop.
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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: iterator
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* @host: host whiches devices we want to iterate over
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*
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* This traverses over each devices of @shost. It does _not_ take a
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* reference on the scsi_device, thus it the whole loop must be protected
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* by shost->host_lock.
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*
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* Note: The only reason why drivers would want to use this is because
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* they're need to access the device list in irq context. Otherwise you
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* really want to use 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 void scsi_adjust_queue_depth(struct scsi_device *, int, 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_test_unit_ready(struct scsi_device *sdev, int timeout,
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int retries);
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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 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, unsigned int lun, int 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 *);
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extern void scsi_remove_target(struct device *);
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extern void int_to_scsilun(unsigned int, struct scsi_lun *);
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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 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, int timeout, int retries,
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int flag);
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extern int scsi_execute_req(struct scsi_device *sdev, const unsigned char *cmd,
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int data_direction, void *buffer, unsigned bufflen,
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struct scsi_sense_hdr *, int timeout, int retries);
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static inline int scsi_device_online(struct scsi_device *sdev)
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{
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return sdev->sdev_state != SDEV_OFFLINE;
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}
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/* accessor functions for the SCSI parameters */
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static inline int scsi_device_sync(struct scsi_device *sdev)
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{
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return sdev->sdtr;
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}
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static inline int scsi_device_wide(struct scsi_device *sdev)
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{
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return sdev->wdtr;
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}
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static inline int scsi_device_dt(struct scsi_device *sdev)
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{
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return sdev->ppr;
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}
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static inline int scsi_device_dt_only(struct scsi_device *sdev)
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{
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if (sdev->inquiry_len < 57)
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return 0;
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return (sdev->inquiry[56] & 0x0c) == 0x04;
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}
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static inline int scsi_device_ius(struct scsi_device *sdev)
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{
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if (sdev->inquiry_len < 57)
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return 0;
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return sdev->inquiry[56] & 0x01;
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}
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static inline int scsi_device_qas(struct scsi_device *sdev)
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{
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if (sdev->inquiry_len < 57)
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return 0;
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return sdev->inquiry[56] & 0x02;
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}
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#endif /* _SCSI_SCSI_DEVICE_H */
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