cregit-Linux how code gets into the kernel

Release 4.7 include/linux/blk-mq.h

Directory: include/linux
#ifndef BLK_MQ_H

#define BLK_MQ_H

#include <linux/blkdev.h>

struct blk_mq_tags;
struct blk_flush_queue;


struct blk_mq_cpu_notifier {
	
struct list_head list;
	
void *data;
	
int (*notify)(void *data, unsigned long action, unsigned int cpu);
};


struct blk_mq_ctxmap {
	
unsigned int size;
	
unsigned int bits_per_word;
	
struct blk_align_bitmap *map;
};


struct blk_mq_hw_ctx {
	struct {
		
spinlock_t		lock;
		
struct list_head	dispatch;
	} 
____cacheline_aligned_in_smp;

	
unsigned long		state;		/* BLK_MQ_S_* flags */
	
struct delayed_work	run_work;
	
struct delayed_work	delay_work;
	
cpumask_var_t		cpumask;
	
int			next_cpu;
	
int			next_cpu_batch;

	
unsigned long		flags;		/* BLK_MQ_F_* flags */

	
struct request_queue	*queue;
	
struct blk_flush_queue	*fq;

	
void			*driver_data;

	
struct blk_mq_ctxmap	ctx_map;

	
unsigned int		nr_ctx;
	
struct blk_mq_ctx	**ctxs;

	
atomic_t		wait_index;

	
struct blk_mq_tags	*tags;

	
unsigned long		queued;
	
unsigned long		run;

#define BLK_MQ_MAX_DISPATCH_ORDER	10
	
unsigned long		dispatched[BLK_MQ_MAX_DISPATCH_ORDER];

	
unsigned int		numa_node;
	
unsigned int		queue_num;

	
atomic_t		nr_active;

	
struct blk_mq_cpu_notifier	cpu_notifier;
	
struct kobject		kobj;

	
unsigned long		poll_invoked;
	
unsigned long		poll_success;
};


struct blk_mq_tag_set {
	
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;
	
struct list_head *list;
	
bool last;
};


typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);

typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);

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)(void *, struct request *, unsigned int,
		unsigned int, unsigned int);

typedef void (exit_request_fn)(void *, struct request *, unsigned int,
		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);



struct blk_mq_ops {
	/*
         * Queue request
         */
	
queue_rq_fn		*queue_rq;

	/*
         * Map to specific hardware queue
         */
	
map_queue_fn		*map_queue;

	/*
         * 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;
};

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_DEFER_ISSUE	= 1 << 4,
	
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_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_disk(struct gendisk *);
void blk_mq_unregister_disk(struct gendisk *);

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_insert_request(struct request *, bool, bool, bool);
void blk_mq_free_request(struct request *rq);
void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, 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 */
};

struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
		unsigned int flags);
struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags);

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; }

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

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struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int); 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); void blk_mq_add_to_requeue_list(struct request *rq, bool at_head); void blk_mq_cancel_requeue_work(struct request_queue *q); void blk_mq_kick_requeue_list(struct request_queue *q); void blk_mq_abort_requeue_list(struct request_queue *q); void blk_mq_complete_request(struct request *rq, int error); 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_queues(struct request_queue *q, 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_mq_freeze_queue_start(struct request_queue *q); 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); }

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

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#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

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Directory: include/linux
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