mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
6f3b0e8bcf
We already have the reserved flag, and a nowait flag awkwardly encoded as a gfp_t. Add a real flags argument to make the scheme more extensible and allow for a nicer calling convention. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
#ifndef INT_BLK_MQ_H
|
|
#define INT_BLK_MQ_H
|
|
|
|
struct blk_mq_tag_set;
|
|
|
|
struct blk_mq_ctx {
|
|
struct {
|
|
spinlock_t lock;
|
|
struct list_head rq_list;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
unsigned int cpu;
|
|
unsigned int index_hw;
|
|
|
|
unsigned int last_tag ____cacheline_aligned_in_smp;
|
|
|
|
/* incremented at dispatch time */
|
|
unsigned long rq_dispatched[2];
|
|
unsigned long rq_merged;
|
|
|
|
/* incremented at completion time */
|
|
unsigned long ____cacheline_aligned_in_smp rq_completed[2];
|
|
|
|
struct request_queue *queue;
|
|
struct kobject kobj;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
|
|
void blk_mq_freeze_queue(struct request_queue *q);
|
|
void blk_mq_free_queue(struct request_queue *q);
|
|
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
|
|
void blk_mq_wake_waiters(struct request_queue *q);
|
|
|
|
/*
|
|
* CPU hotplug helpers
|
|
*/
|
|
struct blk_mq_cpu_notifier;
|
|
void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
|
|
int (*fn)(void *, unsigned long, unsigned int),
|
|
void *data);
|
|
void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
|
|
void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
|
|
void blk_mq_cpu_init(void);
|
|
void blk_mq_enable_hotplug(void);
|
|
void blk_mq_disable_hotplug(void);
|
|
|
|
/*
|
|
* CPU -> queue mappings
|
|
*/
|
|
extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
|
|
extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
|
|
const struct cpumask *online_mask);
|
|
extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
|
|
|
|
/*
|
|
* sysfs helpers
|
|
*/
|
|
extern int blk_mq_sysfs_register(struct request_queue *q);
|
|
extern void blk_mq_sysfs_unregister(struct request_queue *q);
|
|
|
|
extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
|
|
|
|
void blk_mq_release(struct request_queue *q);
|
|
|
|
/*
|
|
* Basic implementation of sparser bitmap, allowing the user to spread
|
|
* the bits over more cachelines.
|
|
*/
|
|
struct blk_align_bitmap {
|
|
unsigned long word;
|
|
unsigned long depth;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
|
|
unsigned int cpu)
|
|
{
|
|
return per_cpu_ptr(q->queue_ctx, cpu);
|
|
}
|
|
|
|
/*
|
|
* This assumes per-cpu software queueing queues. They could be per-node
|
|
* as well, for instance. For now this is hardcoded as-is. Note that we don't
|
|
* care about preemption, since we know the ctx's are persistent. This does
|
|
* mean that we can't rely on ctx always matching the currently running CPU.
|
|
*/
|
|
static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
|
|
{
|
|
return __blk_mq_get_ctx(q, get_cpu());
|
|
}
|
|
|
|
static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
|
|
{
|
|
put_cpu();
|
|
}
|
|
|
|
struct blk_mq_alloc_data {
|
|
/* input parameter */
|
|
struct request_queue *q;
|
|
unsigned int flags;
|
|
|
|
/* input & output parameter */
|
|
struct blk_mq_ctx *ctx;
|
|
struct blk_mq_hw_ctx *hctx;
|
|
};
|
|
|
|
static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
|
|
struct request_queue *q, unsigned int flags,
|
|
struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
data->q = q;
|
|
data->flags = flags;
|
|
data->ctx = ctx;
|
|
data->hctx = hctx;
|
|
}
|
|
|
|
static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
return hctx->nr_ctx && hctx->tags;
|
|
}
|
|
|
|
#endif
|