#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;
* 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_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 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;/* don't let QUEUE_FULLs on the same
- jiffie count on our counter, they
- could all be from the same event. */
+ 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, lun, channel;
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
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 is_visible:1; /* is the device visible in sysfs */
+
+ 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. */
atomic_t iodone_cnt;
atomic_t ioerr_cnt;
- int timeout;
-
- struct device sdev_gendev;
- struct class_device sdev_classdev;
+ 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;
+};
+
+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;
+ 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 *, activate_complete, void *);
+ int (*prep_fn)(struct scsi_device *, struct request *);
+ int (*set_params)(struct scsi_device *, const char *);
+};
+
+struct scsi_dh_data {
+ struct scsi_device_handler *scsi_dh;
+ struct scsi_device *sdev;
+ struct kref kref;
+ 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_classdev)
+ container_of(d, struct scsi_device, sdev_dev)
#define transport_class_to_sdev(class_dev) \
- to_scsi_device(class_dev->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...) \
- dev_printk(prefix, &(scmd)->device->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_RUNNING = 1,
+ STARGET_CREATED = 1,
+ STARGET_RUNNING,
STARGET_DEL,
};
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;
return to_scsi_target(sdev->sdev_gendev.parent);
}
#define transport_class_to_starget(class_dev) \
- to_scsi_target(class_dev->dev)
+ to_scsi_target(class_dev->parent)
#define starget_printk(prefix, starget, fmt, a...) \
dev_printk(prefix, &(starget)->dev, fmt, ##a)
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_device_cancel(struct scsi_device *, int);
+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 *);
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: iterator
- * @host: host whiches devices we want to iterate over
+ * 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
*
- * 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.
+ * 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) = __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
+ * __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
*
- * 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.
+ * 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 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.
+ * 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)
struct scsi_mode_data *data,
struct scsi_sense_hdr *);
extern int scsi_test_unit_ready(struct scsi_device *sdev, int timeout,
- int retries);
+ 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_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_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 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);
-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);
+ struct scsi_sense_hdr *, int timeout, int retries,
+ int *resid);
static inline int __must_check scsi_device_reprobe(struct scsi_device *sdev)
{
#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;
+ 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 */
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 */
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