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Diffstat (limited to 'include/scsi/scsi_device.h')
| -rw-r--r-- | include/scsi/scsi_device.h | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h new file mode 100644 index 000000000000..07d974051b0c --- /dev/null +++ b/include/scsi/scsi_device.h @@ -0,0 +1,282 @@ +#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_mode_data; + + +/* + * 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 */ + + volatile unsigned short device_busy; /* commands actually active on low-level */ + spinlock_t sdev_lock; /* also the request 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) + +/* + * 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 */ + unsigned long starget_data[0]; +} __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) + +extern struct scsi_device *__scsi_add_device(struct Scsi_Host *, + uint, uint, uint, void *hostdata); +#define scsi_add_device(host, channel, target, lun) \ + __scsi_add_device(host, channel, target, lun, NULL) +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); +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 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 *); +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 */ |