--- /dev/null
+#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;
+
+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_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_FIRST = SDEV_EVT_MEDIA_CHANGE,
+ SDEV_EVT_LAST = SDEV_EVT_LUN_CHANGE_REPORTED,
+
+ 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 */
+
+ 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;
+ struct scsi_cmnd *current_cmnd; /* currently active command */
+ 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 */
+ 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 */
+
+#define SCSI_VPD_PG_LEN 255
+ int vpd_pg83_len;
+ unsigned char *vpd_pg83;
+ int vpd_pg80_len;
+ unsigned char *vpd_pg80;
+ 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 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 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] */
+
+ 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_dh_data *scsi_dh_data;
+ enum scsi_device_state sdev_state;
+ unsigned long sdev_data[0];
+} __attribute__((aligned(sizeof(unsigned long))));
+
+typedef void (*activate_complete)(void *, int);
+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;
+ int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
+ struct scsi_dh_data *(*attach)(struct scsi_device *);
+ void (*detach)(struct scsi_device *);
+ int (*activate)(struct scsi_device *, activate_complete, void *);
+ int (*prep_fn)(struct scsi_device *, struct request *);
+ int (*set_params)(struct scsi_device *, const char *);
+ bool (*match)(struct scsi_device *);
+};
+
+struct scsi_dh_data {
+ struct scsi_device_handler *scsi_dh;
+ struct scsi_device *sdev;
+ struct kref kref;
+};
+
+#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_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 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, 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, int 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 void int_to_scsilun(u64, struct scsi_lun *);
+extern u64 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,
+ u64 flags, int *resid);
+extern int scsi_execute_req_flags(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, u64 flags);
+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_req_flags(sdev, cmd, data_direction, buffer,
+ bufflen, sshdr, timeout, retries, resid, 0);
+}
+extern void sdev_disable_disk_events(struct scsi_device *sdev);
+extern void sdev_enable_disk_events(struct scsi_device *sdev);
+
+#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;
+}
+
+/* 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;
+}
+
+#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 */
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