![Christoph Hellwig](/assets/img/avatar_default.png)
Call blk_mq_make_request when no ->make_request_fn is set. This is safe now that blk_alloc_queue always sets up the pointer for make_request based drivers. This avoids an indirect call in the blk-mq driver I/O fast path, which is rather expensive due to spectre mitigations. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
584 lines
18 KiB
C
584 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BLK_MQ_H
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#define BLK_MQ_H
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#include <linux/blkdev.h>
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#include <linux/sbitmap.h>
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#include <linux/srcu.h>
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struct blk_mq_tags;
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struct blk_flush_queue;
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/**
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* struct blk_mq_hw_ctx - State for a hardware queue facing the hardware
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* block device
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*/
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struct blk_mq_hw_ctx {
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struct {
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/** @lock: Protects the dispatch list. */
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spinlock_t lock;
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/**
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* @dispatch: Used for requests that are ready to be
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* dispatched to the hardware but for some reason (e.g. lack of
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* resources) could not be sent to the hardware. As soon as the
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* driver can send new requests, requests at this list will
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* be sent first for a fairer dispatch.
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*/
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struct list_head dispatch;
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/**
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* @state: BLK_MQ_S_* flags. Defines the state of the hw
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* queue (active, scheduled to restart, stopped).
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*/
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unsigned long state;
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} ____cacheline_aligned_in_smp;
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/**
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* @run_work: Used for scheduling a hardware queue run at a later time.
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*/
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struct delayed_work run_work;
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/** @cpumask: Map of available CPUs where this hctx can run. */
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cpumask_var_t cpumask;
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/**
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* @next_cpu: Used by blk_mq_hctx_next_cpu() for round-robin CPU
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* selection from @cpumask.
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*/
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int next_cpu;
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/**
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* @next_cpu_batch: Counter of how many works left in the batch before
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* changing to the next CPU.
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*/
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int next_cpu_batch;
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/** @flags: BLK_MQ_F_* flags. Defines the behaviour of the queue. */
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unsigned long flags;
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/**
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* @sched_data: Pointer owned by the IO scheduler attached to a request
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* queue. It's up to the IO scheduler how to use this pointer.
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*/
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void *sched_data;
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/**
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* @queue: Pointer to the request queue that owns this hardware context.
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*/
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struct request_queue *queue;
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/** @fq: Queue of requests that need to perform a flush operation. */
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struct blk_flush_queue *fq;
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/**
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* @driver_data: Pointer to data owned by the block driver that created
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* this hctx
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*/
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void *driver_data;
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/**
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* @ctx_map: Bitmap for each software queue. If bit is on, there is a
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* pending request in that software queue.
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*/
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struct sbitmap ctx_map;
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/**
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* @dispatch_from: Software queue to be used when no scheduler was
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* selected.
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*/
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struct blk_mq_ctx *dispatch_from;
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/**
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* @dispatch_busy: Number used by blk_mq_update_dispatch_busy() to
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* decide if the hw_queue is busy using Exponential Weighted Moving
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* Average algorithm.
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*/
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unsigned int dispatch_busy;
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/** @type: HCTX_TYPE_* flags. Type of hardware queue. */
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unsigned short type;
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/** @nr_ctx: Number of software queues. */
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unsigned short nr_ctx;
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/** @ctxs: Array of software queues. */
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struct blk_mq_ctx **ctxs;
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/** @dispatch_wait_lock: Lock for dispatch_wait queue. */
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spinlock_t dispatch_wait_lock;
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/**
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* @dispatch_wait: Waitqueue to put requests when there is no tag
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* available at the moment, to wait for another try in the future.
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*/
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wait_queue_entry_t dispatch_wait;
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/**
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* @wait_index: Index of next available dispatch_wait queue to insert
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* requests.
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*/
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atomic_t wait_index;
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/**
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* @tags: Tags owned by the block driver. A tag at this set is only
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* assigned when a request is dispatched from a hardware queue.
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*/
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struct blk_mq_tags *tags;
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/**
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* @sched_tags: Tags owned by I/O scheduler. If there is an I/O
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* scheduler associated with a request queue, a tag is assigned when
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* that request is allocated. Else, this member is not used.
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*/
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struct blk_mq_tags *sched_tags;
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/** @queued: Number of queued requests. */
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unsigned long queued;
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/** @run: Number of dispatched requests. */
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unsigned long run;
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#define BLK_MQ_MAX_DISPATCH_ORDER 7
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/** @dispatched: Number of dispatch requests by queue. */
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unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
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/** @numa_node: NUMA node the storage adapter has been connected to. */
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unsigned int numa_node;
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/** @queue_num: Index of this hardware queue. */
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unsigned int queue_num;
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/**
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* @nr_active: Number of active requests. Only used when a tag set is
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* shared across request queues.
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*/
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atomic_t nr_active;
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/** @cpuhp_dead: List to store request if some CPU die. */
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struct hlist_node cpuhp_dead;
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/** @kobj: Kernel object for sysfs. */
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struct kobject kobj;
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/** @poll_considered: Count times blk_poll() was called. */
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unsigned long poll_considered;
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/** @poll_invoked: Count how many requests blk_poll() polled. */
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unsigned long poll_invoked;
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/** @poll_success: Count how many polled requests were completed. */
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unsigned long poll_success;
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#ifdef CONFIG_BLK_DEBUG_FS
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/**
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* @debugfs_dir: debugfs directory for this hardware queue. Named
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* as cpu<cpu_number>.
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*/
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struct dentry *debugfs_dir;
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/** @sched_debugfs_dir: debugfs directory for the scheduler. */
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struct dentry *sched_debugfs_dir;
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#endif
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/**
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* @hctx_list: if this hctx is not in use, this is an entry in
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* q->unused_hctx_list.
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*/
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struct list_head hctx_list;
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/**
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* @srcu: Sleepable RCU. Use as lock when type of the hardware queue is
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* blocking (BLK_MQ_F_BLOCKING). Must be the last member - see also
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* blk_mq_hw_ctx_size().
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*/
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struct srcu_struct srcu[];
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};
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/**
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* struct blk_mq_queue_map - Map software queues to hardware queues
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* @mq_map: CPU ID to hardware queue index map. This is an array
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* with nr_cpu_ids elements. Each element has a value in the range
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* [@queue_offset, @queue_offset + @nr_queues).
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* @nr_queues: Number of hardware queues to map CPU IDs onto.
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* @queue_offset: First hardware queue to map onto. Used by the PCIe NVMe
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* driver to map each hardware queue type (enum hctx_type) onto a distinct
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* set of hardware queues.
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*/
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struct blk_mq_queue_map {
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unsigned int *mq_map;
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unsigned int nr_queues;
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unsigned int queue_offset;
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};
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/**
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* enum hctx_type - Type of hardware queue
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* @HCTX_TYPE_DEFAULT: All I/O not otherwise accounted for.
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* @HCTX_TYPE_READ: Just for READ I/O.
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* @HCTX_TYPE_POLL: Polled I/O of any kind.
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* @HCTX_MAX_TYPES: Number of types of hctx.
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*/
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enum hctx_type {
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HCTX_TYPE_DEFAULT,
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HCTX_TYPE_READ,
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HCTX_TYPE_POLL,
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HCTX_MAX_TYPES,
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};
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/**
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* struct blk_mq_tag_set - tag set that can be shared between request queues
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* @map: One or more ctx -> hctx mappings. One map exists for each
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* hardware queue type (enum hctx_type) that the driver wishes
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* to support. There are no restrictions on maps being of the
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* same size, and it's perfectly legal to share maps between
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* types.
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* @nr_maps: Number of elements in the @map array. A number in the range
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* [1, HCTX_MAX_TYPES].
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* @ops: Pointers to functions that implement block driver behavior.
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* @nr_hw_queues: Number of hardware queues supported by the block driver that
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* owns this data structure.
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* @queue_depth: Number of tags per hardware queue, reserved tags included.
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* @reserved_tags: Number of tags to set aside for BLK_MQ_REQ_RESERVED tag
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* allocations.
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* @cmd_size: Number of additional bytes to allocate per request. The block
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* driver owns these additional bytes.
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* @numa_node: NUMA node the storage adapter has been connected to.
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* @timeout: Request processing timeout in jiffies.
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* @flags: Zero or more BLK_MQ_F_* flags.
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* @driver_data: Pointer to data owned by the block driver that created this
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* tag set.
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* @tags: Tag sets. One tag set per hardware queue. Has @nr_hw_queues
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* elements.
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* @tag_list_lock: Serializes tag_list accesses.
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* @tag_list: List of the request queues that use this tag set. See also
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* request_queue.tag_set_list.
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*/
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struct blk_mq_tag_set {
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struct blk_mq_queue_map map[HCTX_MAX_TYPES];
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unsigned int nr_maps;
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const struct blk_mq_ops *ops;
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unsigned int nr_hw_queues;
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unsigned int queue_depth;
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unsigned int reserved_tags;
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unsigned int cmd_size;
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int numa_node;
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unsigned int timeout;
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unsigned int flags;
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void *driver_data;
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struct blk_mq_tags **tags;
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struct mutex tag_list_lock;
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struct list_head tag_list;
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};
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/**
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* struct blk_mq_queue_data - Data about a request inserted in a queue
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*
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* @rq: Request pointer.
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* @last: If it is the last request in the queue.
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*/
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struct blk_mq_queue_data {
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struct request *rq;
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bool last;
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};
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typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *,
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const struct blk_mq_queue_data *);
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typedef void (commit_rqs_fn)(struct blk_mq_hw_ctx *);
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typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *);
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typedef void (put_budget_fn)(struct blk_mq_hw_ctx *);
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typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
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typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
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typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
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typedef int (init_request_fn)(struct blk_mq_tag_set *set, struct request *,
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unsigned int, unsigned int);
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typedef void (exit_request_fn)(struct blk_mq_tag_set *set, struct request *,
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unsigned int);
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typedef bool (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
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bool);
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typedef bool (busy_tag_iter_fn)(struct request *, void *, bool);
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typedef int (poll_fn)(struct blk_mq_hw_ctx *);
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typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
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typedef bool (busy_fn)(struct request_queue *);
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typedef void (complete_fn)(struct request *);
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typedef void (cleanup_rq_fn)(struct request *);
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/**
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* struct blk_mq_ops - Callback functions that implements block driver
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* behaviour.
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*/
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struct blk_mq_ops {
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/**
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* @queue_rq: Queue a new request from block IO.
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*/
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queue_rq_fn *queue_rq;
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/**
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* @commit_rqs: If a driver uses bd->last to judge when to submit
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* requests to hardware, it must define this function. In case of errors
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* that make us stop issuing further requests, this hook serves the
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* purpose of kicking the hardware (which the last request otherwise
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* would have done).
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*/
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commit_rqs_fn *commit_rqs;
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/**
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* @get_budget: Reserve budget before queue request, once .queue_rq is
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* run, it is driver's responsibility to release the
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* reserved budget. Also we have to handle failure case
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* of .get_budget for avoiding I/O deadlock.
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*/
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get_budget_fn *get_budget;
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/**
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* @put_budget: Release the reserved budget.
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*/
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put_budget_fn *put_budget;
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/**
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* @timeout: Called on request timeout.
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*/
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timeout_fn *timeout;
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/**
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* @poll: Called to poll for completion of a specific tag.
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*/
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poll_fn *poll;
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/**
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* @complete: Mark the request as complete.
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*/
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complete_fn *complete;
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/**
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* @init_hctx: Called when the block layer side of a hardware queue has
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* been set up, allowing the driver to allocate/init matching
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* structures.
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*/
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init_hctx_fn *init_hctx;
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/**
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* @exit_hctx: Ditto for exit/teardown.
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*/
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exit_hctx_fn *exit_hctx;
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/**
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* @init_request: Called for every command allocated by the block layer
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* to allow the driver to set up driver specific data.
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*
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* Tag greater than or equal to queue_depth is for setting up
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* flush request.
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*/
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init_request_fn *init_request;
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/**
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* @exit_request: Ditto for exit/teardown.
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*/
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exit_request_fn *exit_request;
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/**
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* @initialize_rq_fn: Called from inside blk_get_request().
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*/
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void (*initialize_rq_fn)(struct request *rq);
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/**
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* @cleanup_rq: Called before freeing one request which isn't completed
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* yet, and usually for freeing the driver private data.
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*/
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cleanup_rq_fn *cleanup_rq;
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/**
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* @busy: If set, returns whether or not this queue currently is busy.
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*/
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busy_fn *busy;
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/**
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* @map_queues: This allows drivers specify their own queue mapping by
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* overriding the setup-time function that builds the mq_map.
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*/
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map_queues_fn *map_queues;
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#ifdef CONFIG_BLK_DEBUG_FS
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/**
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* @show_rq: Used by the debugfs implementation to show driver-specific
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* information about a request.
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*/
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void (*show_rq)(struct seq_file *m, struct request *rq);
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#endif
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};
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enum {
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BLK_MQ_F_SHOULD_MERGE = 1 << 0,
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BLK_MQ_F_TAG_SHARED = 1 << 1,
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BLK_MQ_F_BLOCKING = 1 << 5,
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BLK_MQ_F_NO_SCHED = 1 << 6,
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BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
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BLK_MQ_F_ALLOC_POLICY_BITS = 1,
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BLK_MQ_S_STOPPED = 0,
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BLK_MQ_S_TAG_ACTIVE = 1,
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BLK_MQ_S_SCHED_RESTART = 2,
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BLK_MQ_MAX_DEPTH = 10240,
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BLK_MQ_CPU_WORK_BATCH = 8,
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};
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#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
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((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
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((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
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#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
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((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
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<< BLK_MQ_F_ALLOC_POLICY_START_BIT)
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struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
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struct request_queue *blk_mq_init_queue_data(struct blk_mq_tag_set *set,
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void *queuedata);
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struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
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struct request_queue *q,
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bool elevator_init);
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struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,
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const struct blk_mq_ops *ops,
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unsigned int queue_depth,
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unsigned int set_flags);
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void blk_mq_unregister_dev(struct device *, struct request_queue *);
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int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
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void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
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void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
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void blk_mq_free_request(struct request *rq);
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bool blk_mq_queue_inflight(struct request_queue *q);
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enum {
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/* return when out of requests */
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BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0),
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/* allocate from reserved pool */
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BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1),
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/* allocate internal/sched tag */
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BLK_MQ_REQ_INTERNAL = (__force blk_mq_req_flags_t)(1 << 2),
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/* set RQF_PREEMPT */
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BLK_MQ_REQ_PREEMPT = (__force blk_mq_req_flags_t)(1 << 3),
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};
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struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op,
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blk_mq_req_flags_t flags);
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struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
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unsigned int op, blk_mq_req_flags_t flags,
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unsigned int hctx_idx);
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struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
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enum {
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BLK_MQ_UNIQUE_TAG_BITS = 16,
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BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
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};
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u32 blk_mq_unique_tag(struct request *rq);
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static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
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{
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return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
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}
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static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
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{
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return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
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}
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/**
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* blk_mq_rq_state() - read the current MQ_RQ_* state of a request
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* @rq: target request.
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*/
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static inline enum mq_rq_state blk_mq_rq_state(struct request *rq)
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{
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return READ_ONCE(rq->state);
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}
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static inline int blk_mq_request_started(struct request *rq)
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{
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return blk_mq_rq_state(rq) != MQ_RQ_IDLE;
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}
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|
|
|
static inline int blk_mq_request_completed(struct request *rq)
|
|
{
|
|
return blk_mq_rq_state(rq) == MQ_RQ_COMPLETE;
|
|
}
|
|
|
|
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_kick_requeue_list(struct request_queue *q);
|
|
void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs);
|
|
bool blk_mq_complete_request(struct request *rq);
|
|
bool blk_mq_bio_list_merge(struct request_queue *q, struct list_head *list,
|
|
struct bio *bio, unsigned int nr_segs);
|
|
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_run_hw_queues(struct request_queue *q, 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_tagset_wait_completed_request(struct blk_mq_tag_set *tagset);
|
|
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_map_queues(struct blk_mq_queue_map *qmap);
|
|
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);
|
|
|
|
unsigned int blk_mq_rq_cpu(struct request *rq);
|
|
|
|
/**
|
|
* blk_mq_rq_from_pdu - cast a PDU to a request
|
|
* @pdu: the PDU (Protocol Data Unit) to be casted
|
|
*
|
|
* Return: request
|
|
*
|
|
* Driver command data is immediately after the request. So subtract request
|
|
* size to get back to the original request.
|
|
*/
|
|
static inline struct request *blk_mq_rq_from_pdu(void *pdu)
|
|
{
|
|
return pdu - sizeof(struct request);
|
|
}
|
|
|
|
/**
|
|
* blk_mq_rq_to_pdu - cast a request to a PDU
|
|
* @rq: the request to be casted
|
|
*
|
|
* Return: pointer to the PDU
|
|
*
|
|
* Driver command data is immediately after the request. So add request to get
|
|
* the PDU.
|
|
*/
|
|
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)++)
|
|
|
|
static inline blk_qc_t request_to_qc_t(struct blk_mq_hw_ctx *hctx,
|
|
struct request *rq)
|
|
{
|
|
if (rq->tag != -1)
|
|
return rq->tag | (hctx->queue_num << BLK_QC_T_SHIFT);
|
|
|
|
return rq->internal_tag | (hctx->queue_num << BLK_QC_T_SHIFT) |
|
|
BLK_QC_T_INTERNAL;
|
|
}
|
|
|
|
static inline void blk_mq_cleanup_rq(struct request *rq)
|
|
{
|
|
if (rq->q->mq_ops->cleanup_rq)
|
|
rq->q->mq_ops->cleanup_rq(rq);
|
|
}
|
|
|
|
blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio);
|
|
|
|
#endif
|