include/linux/blk-mq.h - arm/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #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_entry_t		dispatch_wait;
 	atomic_t		wait_index;

 	struct blk_mq_tags	*tags;
 	struct blk_mq_tags	*sched_tags;

 	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

 	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
 	struct srcu_struct	queue_rq_srcu[0];
 };

 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 blk_status_t (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 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;
 	/* Called from inside blk_get_request() */
 	void (*initialize_rq_fn)(struct request *rq);

 	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_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, unsigned int op,
 		unsigned int flags);
 struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
 		unsigned 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;
 }

 static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
 {
 	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
 }


 int blk_mq_request_started(struct request *rq);
 void blk_mq_start_request(struct request *rq);
 void blk_mq_end_request(struct request *rq, blk_status_t error);
 void __blk_mq_end_request(struct request *rq, blk_status_t 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_quiesce_queue(struct request_queue *q);
 void blk_mq_unquiesce_queue(struct request_queue *q);
 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 (reinit_request)(void *, struct request *));

 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);

 void blk_mq_quiesce_queue_nowait(struct request_queue *q);

 /*
  * 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);
 }
 static inline void *blk_mq_rq_to_pdu(struct request *rq)
 {
 	return rq + 1;
 }

 #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
	/* SPDX-License-Identifier: GPL-2.0 */
	#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_entry_t dispatch_wait;
	atomic_t wait_index;

	struct blk_mq_tags *tags;
	struct blk_mq_tags *sched_tags;

	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

	/* Must be the last member - see also blk_mq_hw_ctx_size(). */
	struct srcu_struct queue_rq_srcu[0];
	};

	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 blk_status_t (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 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;
	/* Called from inside blk_get_request() */
	void (initialize_rq_fn)(struct request rq);

	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_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, unsigned int op,
	unsigned int flags);
	struct request blk_mq_alloc_request_hctx(struct request_queue q,
	unsigned 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;
	}

	static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
	{
	return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
	}


	int blk_mq_request_started(struct request *rq);
	void blk_mq_start_request(struct request *rq);
	void blk_mq_end_request(struct request *rq, blk_status_t error);
	void __blk_mq_end_request(struct request *rq, blk_status_t 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_quiesce_queue(struct request_queue *q);
	void blk_mq_unquiesce_queue(struct request_queue *q);
	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 (reinit_request)(void , struct request ));

	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);

	void blk_mq_quiesce_queue_nowait(struct request_queue *q);

	/*
	* 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);
	}
	static inline void blk_mq_rq_to_pdu(struct request rq)
	{
	return rq + 1;
	}

	#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