Release 4.12 include/linux/blk-mq.h
#ifndef BLK_MQ_H
#define BLK_MQ_H
#include <linux/blkdev.h>
#include <linux/sbitmap.h>
#include <linux/srcu.h>
struct blk_mq_tags;
struct blk_flush_queue;
struct blk_mq_hw_ctx {
struct {
spinlock_t lock;
struct list_head dispatch;
unsigned long state; /* BLK_MQ_S_* flags */
} ____cacheline_aligned_in_smp;
struct delayed_work run_work;
cpumask_var_t cpumask;
int next_cpu;
int next_cpu_batch;
unsigned long flags; /* BLK_MQ_F_* flags */
void *sched_data;
struct request_queue *queue;
struct blk_flush_queue *fq;
void *driver_data;
struct sbitmap ctx_map;
struct blk_mq_ctx **ctxs;
unsigned int nr_ctx;
wait_queue_t dispatch_wait;
atomic_t wait_index;
struct blk_mq_tags *tags;
struct blk_mq_tags *sched_tags;
struct srcu_struct queue_rq_srcu;
unsigned long queued;
unsigned long run;
#define BLK_MQ_MAX_DISPATCH_ORDER 7
unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
unsigned int numa_node;
unsigned int queue_num;
atomic_t nr_active;
struct hlist_node cpuhp_dead;
struct kobject kobj;
unsigned long poll_considered;
unsigned long poll_invoked;
unsigned long poll_success;
#ifdef CONFIG_BLK_DEBUG_FS
struct dentry *debugfs_dir;
struct dentry *sched_debugfs_dir;
#endif
};
struct blk_mq_tag_set {
unsigned int *mq_map;
const struct blk_mq_ops *ops;
unsigned int nr_hw_queues;
unsigned int queue_depth; /* max hw supported */
unsigned int reserved_tags;
unsigned int cmd_size; /* per-request extra data */
int numa_node;
unsigned int timeout;
unsigned int flags; /* BLK_MQ_F_* */
void *driver_data;
struct blk_mq_tags **tags;
struct mutex tag_list_lock;
struct list_head tag_list;
};
struct blk_mq_queue_data {
struct request *rq;
bool last;
};
typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (init_request_fn)(struct blk_mq_tag_set *set, struct request *,
unsigned int, unsigned int);
typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
unsigned int);
typedef int (reinit_request_fn)(void *, struct request *);
typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
bool);
typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
struct blk_mq_ops {
/*
* Queue request
*/
queue_rq_fn *queue_rq;
/*
* Called on request timeout
*/
timeout_fn *timeout;
/*
* Called to poll for completion of a specific tag.
*/
poll_fn *poll;
softirq_done_fn *complete;
/*
* Called when the block layer side of a hardware queue has been
* set up, allowing the driver to allocate/init matching structures.
* Ditto for exit/teardown.
*/
init_hctx_fn *init_hctx;
exit_hctx_fn *exit_hctx;
/*
* Called for every command allocated by the block layer to allow
* the driver to set up driver specific data.
*
* Tag greater than or equal to queue_depth is for setting up
* flush request.
*
* Ditto for exit/teardown.
*/
init_request_fn *init_request;
exit_request_fn *exit_request;
reinit_request_fn *reinit_request;
map_queues_fn *map_queues;
#ifdef CONFIG_BLK_DEBUG_FS
/*
* Used by the debugfs implementation to show driver-specific
* information about a request.
*/
void (*show_rq)(struct seq_file *m, struct request *rq);
#endif
};
enum {
BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
BLK_MQ_F_SHOULD_MERGE = 1 << 0,
BLK_MQ_F_TAG_SHARED = 1 << 1,
BLK_MQ_F_SG_MERGE = 1 << 2,
BLK_MQ_F_BLOCKING = 1 << 5,
BLK_MQ_F_NO_SCHED = 1 << 6,
BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
BLK_MQ_F_ALLOC_POLICY_BITS = 1,
BLK_MQ_S_STOPPED = 0,
BLK_MQ_S_TAG_ACTIVE = 1,
BLK_MQ_S_SCHED_RESTART = 2,
BLK_MQ_S_TAG_WAITING = 3,
BLK_MQ_S_START_ON_RUN = 4,
BLK_MQ_MAX_DEPTH = 10240,
BLK_MQ_CPU_WORK_BATCH = 8,
};
#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
struct request_queue *q);
int blk_mq_register_dev(struct device *, struct request_queue *);
void blk_mq_unregister_dev(struct device *, struct request_queue *);
int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
enum {
BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */
BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */
BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */
};
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
unsigned int flags);
struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op,
unsigned int flags, unsigned int hctx_idx);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
enum {
BLK_MQ_UNIQUE_TAG_BITS = 16,
BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
};
u32 blk_mq_unique_tag(struct request *rq);
static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
{
return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Bart Van Assche | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
{
return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Bart Van Assche | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
int blk_mq_request_started(struct request *rq);
void blk_mq_start_request(struct request *rq);
void blk_mq_end_request(struct request *rq, int error);
void __blk_mq_end_request(struct request *rq, int error);
void blk_mq_requeue_request(struct request *rq, bool kick_requeue_list);
void blk_mq_add_to_requeue_list(struct request *rq, bool at_head,
bool kick_requeue_list);
void blk_mq_kick_requeue_list(struct request_queue *q);
void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
void blk_mq_complete_request(struct request *rq);
bool blk_mq_queue_stopped(struct request_queue *q);
void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_stop_hw_queues(struct request_queue *q);
void blk_mq_start_hw_queues(struct request_queue *q);
void blk_mq_start_stopped_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
void blk_mq_run_hw_queues(struct request_queue *q, bool async);
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
busy_tag_iter_fn *fn, void *priv);
void blk_mq_freeze_queue(struct request_queue *q);
void blk_mq_unfreeze_queue(struct request_queue *q);
void blk_freeze_queue_start(struct request_queue *q);
void blk_mq_freeze_queue_wait(struct request_queue *q);
int blk_mq_freeze_queue_wait_timeout(struct request_queue *q,
unsigned long timeout);
int blk_mq_reinit_tagset(struct blk_mq_tag_set *set);
int blk_mq_map_queues(struct blk_mq_tag_set *set);
void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues);
/*
* Driver command data is immediately after the request. So subtract request
* size to get back to the original request, add request size to get the PDU.
*/
static inline struct request *blk_mq_rq_from_pdu(void *pdu)
{
return pdu - sizeof(struct request);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jens Axboe | 22 | 100.00% | 1 | 100.00% |
| Total | 22 | 100.00% | 1 | 100.00% |
static inline void *blk_mq_rq_to_pdu(struct request *rq)
{
return rq + 1;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jens Axboe | 18 | 100.00% | 2 | 100.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
#define queue_for_each_hw_ctx(q, hctx, i) \
for ((i) = 0; (i) < (q)->nr_hw_queues && \
({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
#define hctx_for_each_ctx(hctx, ctx, i) \
for ((i) = 0; (i) < (hctx)->nr_ctx && \
({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
#endif
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Jens Axboe | 566 | 46.13% | 25 | 32.47% |
| Christoph Hellwig | 271 | 22.09% | 20 | 25.97% |
| Bart Van Assche | 114 | 9.29% | 6 | 7.79% |
| Keith Busch | 75 | 6.11% | 6 | 7.79% |
| Sagi Grimberg | 44 | 3.59% | 2 | 2.60% |
| Mike Snitzer | 41 | 3.34% | 3 | 3.90% |
| Omar Sandoval | 38 | 3.10% | 5 | 6.49% |
| Shaohua Li | 24 | 1.96% | 1 | 1.30% |
| Ming Lin | 22 | 1.79% | 1 | 1.30% |
| Matias Björling | 12 | 0.98% | 1 | 1.30% |
| Ming Lei | 9 | 0.73% | 1 | 1.30% |
| Stephen Bates | 4 | 0.33% | 1 | 1.30% |
| Jose Alonso | 2 | 0.16% | 1 | 1.30% |
| Thomas Gleixner | 2 | 0.16% | 1 | 1.30% |
| Alexander Gordeev | 1 | 0.08% | 1 | 1.30% |
| Sam Bradshaw | 1 | 0.08% | 1 | 1.30% |
| Lei Ming | 1 | 0.08% | 1 | 1.30% |
| Total | 1227 | 100.00% | 77 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.