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![Linus Torvalds](/assets/img/avatar_default.png)
-----BEGIN PGP SIGNATURE----- iQJEBAABCAAuFiEEwPw5LcreJtl1+l5K99NY+ylx4KYFAl0jrIMQHGF4Ym9lQGtl cm5lbC5kawAKCRD301j7KXHgptlFD/9CNsBX+Aap2lO6wKNr6QISwNAK76GMzEay s4LSY2kGkXvzv8i89mCuY+8UVNI8WH2/22WnU+8CBAJOjWyFQMsIwH/mrq0oZWRD J6STJE8rTr6Fc2MvJUWryp/xdBh3+eDIsAdIZVHVAkIzqYPBnpIAwEIeIw8t0xsm v9ngpQ3WD6ep8tOj9pnG1DGKFg1CmukZCC/Y4CQV1vZtmm2I935zUwNV/TB+Egfx G8JSC0cSV02LMK88HCnA6MnC/XSUC0qgfXbnmP+TpKlgjVX+P/fuB3oIYcZEu2Rk 3YBpIkhsQytKYbF42KRLsmBH72u6oB9G+tNZTgB1STUDrZqdtD9xwX1rjDlY0ZzP EUDnk48jl/cxbs+VZrHoE2TcNonLiymV7Kb92juHXdIYmKFQStprGcQUbMaTkMfB 6BYrYLifWx0leu1JJ1i7qhNmug94BYCSCxcRmH0p6kPazPcY9LXNmDWMfMuBPZT7 z79VLZnHF2wNXJyT1cBluwRYYJRT4osWZ3XUaBWFKDgf1qyvXJfrN/4zmgkEIyW7 ivXC+KLlGkhntDlWo2pLKbbyOIKY1HmU6aROaI11k5Zyh0ixKB7tHKavK39l+NOo YB41+4l6VEpQEyxyRk8tO0sbHpKaKB+evVIK3tTwbY+Q0qTExErxjfWUtOgRWhjx iXJssPRo4w== =VSYT -----END PGP SIGNATURE----- Merge tag 'for-5.3/block-20190708' of git://git.kernel.dk/linux-block Pull block updates from Jens Axboe: "This is the main block updates for 5.3. Nothing earth shattering or major in here, just fixes, additions, and improvements all over the map. This contains: - Series of documentation fixes (Bart) - Optimization of the blk-mq ctx get/put (Bart) - null_blk removal race condition fix (Bob) - req/bio_op() cleanups (Chaitanya) - Series cleaning up the segment accounting, and request/bio mapping (Christoph) - Series cleaning up the page getting/putting for bios (Christoph) - block cgroup cleanups and moving it to where it is used (Christoph) - block cgroup fixes (Tejun) - Series of fixes and improvements to bcache, most notably a write deadlock fix (Coly) - blk-iolatency STS_AGAIN and accounting fixes (Dennis) - Series of improvements and fixes to BFQ (Douglas, Paolo) - debugfs_create() return value check removal for drbd (Greg) - Use struct_size(), where appropriate (Gustavo) - Two lighnvm fixes (Heiner, Geert) - MD fixes, including a read balance and corruption fix (Guoqing, Marcos, Xiao, Yufen) - block opal shadow mbr additions (Jonas, Revanth) - sbitmap compare-and-exhange improvemnts (Pavel) - Fix for potential bio->bi_size overflow (Ming) - NVMe pull requests: - improved PCIe suspent support (Keith Busch) - error injection support for the admin queue (Akinobu Mita) - Fibre Channel discovery improvements (James Smart) - tracing improvements including nvmetc tracing support (Minwoo Im) - misc fixes and cleanups (Anton Eidelman, Minwoo Im, Chaitanya Kulkarni)" - Various little fixes and improvements to drivers and core" * tag 'for-5.3/block-20190708' of git://git.kernel.dk/linux-block: (153 commits) blk-iolatency: fix STS_AGAIN handling block: nr_phys_segments needs to be zero for REQ_OP_WRITE_ZEROES blk-mq: simplify blk_mq_make_request() blk-mq: remove blk_mq_put_ctx() sbitmap: Replace cmpxchg with xchg block: fix .bi_size overflow block: sed-opal: check size of shadow mbr block: sed-opal: ioctl for writing to shadow mbr block: sed-opal: add ioctl for done-mark of shadow mbr block: never take page references for ITER_BVEC direct-io: use bio_release_pages in dio_bio_complete block_dev: use bio_release_pages in bio_unmap_user block_dev: use bio_release_pages in blkdev_bio_end_io iomap: use bio_release_pages in iomap_dio_bio_end_io block: use bio_release_pages in bio_map_user_iov block: use bio_release_pages in bio_unmap_user block: optionally mark pages dirty in bio_release_pages block: move the BIO_NO_PAGE_REF check into bio_release_pages block: skd_main.c: Remove call to memset after dma_alloc_coherent block: mtip32xx: Remove call to memset after dma_alloc_coherent ...
990 lines
24 KiB
C
990 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2017 Facebook
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*/
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/debugfs.h>
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#include <linux/blk-mq.h>
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#include "blk.h"
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#include "blk-mq.h"
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#include "blk-mq-debugfs.h"
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#include "blk-mq-tag.h"
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#include "blk-rq-qos.h"
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static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
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{
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if (stat->nr_samples) {
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seq_printf(m, "samples=%d, mean=%llu, min=%llu, max=%llu",
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stat->nr_samples, stat->mean, stat->min, stat->max);
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} else {
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seq_puts(m, "samples=0");
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}
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}
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static int queue_poll_stat_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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int bucket;
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for (bucket = 0; bucket < (BLK_MQ_POLL_STATS_BKTS / 2); bucket++) {
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seq_printf(m, "read (%d Bytes): ", 1 << (9 + bucket));
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print_stat(m, &q->poll_stat[2 * bucket]);
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seq_puts(m, "\n");
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seq_printf(m, "write (%d Bytes): ", 1 << (9 + bucket));
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print_stat(m, &q->poll_stat[2 * bucket + 1]);
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seq_puts(m, "\n");
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}
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return 0;
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}
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static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
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__acquires(&q->requeue_lock)
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{
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struct request_queue *q = m->private;
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spin_lock_irq(&q->requeue_lock);
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return seq_list_start(&q->requeue_list, *pos);
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}
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static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct request_queue *q = m->private;
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return seq_list_next(v, &q->requeue_list, pos);
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}
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static void queue_requeue_list_stop(struct seq_file *m, void *v)
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__releases(&q->requeue_lock)
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{
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struct request_queue *q = m->private;
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spin_unlock_irq(&q->requeue_lock);
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}
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static const struct seq_operations queue_requeue_list_seq_ops = {
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.start = queue_requeue_list_start,
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.next = queue_requeue_list_next,
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.stop = queue_requeue_list_stop,
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.show = blk_mq_debugfs_rq_show,
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};
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static int blk_flags_show(struct seq_file *m, const unsigned long flags,
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const char *const *flag_name, int flag_name_count)
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{
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bool sep = false;
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int i;
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for (i = 0; i < sizeof(flags) * BITS_PER_BYTE; i++) {
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if (!(flags & BIT(i)))
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continue;
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if (sep)
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seq_puts(m, "|");
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sep = true;
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if (i < flag_name_count && flag_name[i])
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seq_puts(m, flag_name[i]);
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else
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seq_printf(m, "%d", i);
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}
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return 0;
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}
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static int queue_pm_only_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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seq_printf(m, "%d\n", atomic_read(&q->pm_only));
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return 0;
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}
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#define QUEUE_FLAG_NAME(name) [QUEUE_FLAG_##name] = #name
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static const char *const blk_queue_flag_name[] = {
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QUEUE_FLAG_NAME(STOPPED),
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QUEUE_FLAG_NAME(DYING),
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QUEUE_FLAG_NAME(NOMERGES),
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QUEUE_FLAG_NAME(SAME_COMP),
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QUEUE_FLAG_NAME(FAIL_IO),
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QUEUE_FLAG_NAME(NONROT),
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QUEUE_FLAG_NAME(IO_STAT),
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QUEUE_FLAG_NAME(DISCARD),
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QUEUE_FLAG_NAME(NOXMERGES),
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QUEUE_FLAG_NAME(ADD_RANDOM),
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QUEUE_FLAG_NAME(SECERASE),
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QUEUE_FLAG_NAME(SAME_FORCE),
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QUEUE_FLAG_NAME(DEAD),
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QUEUE_FLAG_NAME(INIT_DONE),
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QUEUE_FLAG_NAME(POLL),
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QUEUE_FLAG_NAME(WC),
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QUEUE_FLAG_NAME(FUA),
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QUEUE_FLAG_NAME(DAX),
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QUEUE_FLAG_NAME(STATS),
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QUEUE_FLAG_NAME(POLL_STATS),
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QUEUE_FLAG_NAME(REGISTERED),
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QUEUE_FLAG_NAME(SCSI_PASSTHROUGH),
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QUEUE_FLAG_NAME(QUIESCED),
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};
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#undef QUEUE_FLAG_NAME
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static int queue_state_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
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ARRAY_SIZE(blk_queue_flag_name));
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seq_puts(m, "\n");
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return 0;
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}
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static ssize_t queue_state_write(void *data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct request_queue *q = data;
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char opbuf[16] = { }, *op;
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/*
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* The "state" attribute is removed after blk_cleanup_queue() has called
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* blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid
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* triggering a use-after-free.
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*/
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if (blk_queue_dead(q))
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return -ENOENT;
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if (count >= sizeof(opbuf)) {
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pr_err("%s: operation too long\n", __func__);
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goto inval;
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}
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if (copy_from_user(opbuf, buf, count))
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return -EFAULT;
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op = strstrip(opbuf);
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if (strcmp(op, "run") == 0) {
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blk_mq_run_hw_queues(q, true);
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} else if (strcmp(op, "start") == 0) {
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blk_mq_start_stopped_hw_queues(q, true);
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} else if (strcmp(op, "kick") == 0) {
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blk_mq_kick_requeue_list(q);
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} else {
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pr_err("%s: unsupported operation '%s'\n", __func__, op);
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inval:
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pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
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return -EINVAL;
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}
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return count;
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}
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static int queue_write_hint_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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int i;
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for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
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seq_printf(m, "hint%d: %llu\n", i, q->write_hints[i]);
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return 0;
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}
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static ssize_t queue_write_hint_store(void *data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct request_queue *q = data;
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int i;
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for (i = 0; i < BLK_MAX_WRITE_HINTS; i++)
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q->write_hints[i] = 0;
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return count;
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}
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static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
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{ "poll_stat", 0400, queue_poll_stat_show },
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{ "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
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{ "pm_only", 0600, queue_pm_only_show, NULL },
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{ "state", 0600, queue_state_show, queue_state_write },
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{ "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
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{ "zone_wlock", 0400, queue_zone_wlock_show, NULL },
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{ },
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};
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#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
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static const char *const hctx_state_name[] = {
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HCTX_STATE_NAME(STOPPED),
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HCTX_STATE_NAME(TAG_ACTIVE),
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HCTX_STATE_NAME(SCHED_RESTART),
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};
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#undef HCTX_STATE_NAME
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static int hctx_state_show(void *data, struct seq_file *m)
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{
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struct blk_mq_hw_ctx *hctx = data;
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blk_flags_show(m, hctx->state, hctx_state_name,
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ARRAY_SIZE(hctx_state_name));
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seq_puts(m, "\n");
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return 0;
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}
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#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
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static const char *const alloc_policy_name[] = {
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BLK_TAG_ALLOC_NAME(FIFO),
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BLK_TAG_ALLOC_NAME(RR),
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};
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#undef BLK_TAG_ALLOC_NAME
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#define HCTX_FLAG_NAME(name) [ilog2(BLK_MQ_F_##name)] = #name
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static const char *const hctx_flag_name[] = {
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HCTX_FLAG_NAME(SHOULD_MERGE),
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HCTX_FLAG_NAME(TAG_SHARED),
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HCTX_FLAG_NAME(BLOCKING),
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HCTX_FLAG_NAME(NO_SCHED),
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};
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#undef HCTX_FLAG_NAME
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static int hctx_flags_show(void *data, struct seq_file *m)
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{
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struct blk_mq_hw_ctx *hctx = data;
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const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
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seq_puts(m, "alloc_policy=");
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if (alloc_policy < ARRAY_SIZE(alloc_policy_name) &&
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alloc_policy_name[alloc_policy])
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seq_puts(m, alloc_policy_name[alloc_policy]);
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else
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seq_printf(m, "%d", alloc_policy);
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seq_puts(m, " ");
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blk_flags_show(m,
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hctx->flags ^ BLK_ALLOC_POLICY_TO_MQ_FLAG(alloc_policy),
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hctx_flag_name, ARRAY_SIZE(hctx_flag_name));
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seq_puts(m, "\n");
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return 0;
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}
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#define CMD_FLAG_NAME(name) [__REQ_##name] = #name
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static const char *const cmd_flag_name[] = {
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CMD_FLAG_NAME(FAILFAST_DEV),
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CMD_FLAG_NAME(FAILFAST_TRANSPORT),
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CMD_FLAG_NAME(FAILFAST_DRIVER),
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CMD_FLAG_NAME(SYNC),
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CMD_FLAG_NAME(META),
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CMD_FLAG_NAME(PRIO),
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CMD_FLAG_NAME(NOMERGE),
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CMD_FLAG_NAME(IDLE),
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CMD_FLAG_NAME(INTEGRITY),
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CMD_FLAG_NAME(FUA),
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CMD_FLAG_NAME(PREFLUSH),
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CMD_FLAG_NAME(RAHEAD),
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CMD_FLAG_NAME(BACKGROUND),
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CMD_FLAG_NAME(NOWAIT),
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CMD_FLAG_NAME(NOUNMAP),
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CMD_FLAG_NAME(HIPRI),
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};
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#undef CMD_FLAG_NAME
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#define RQF_NAME(name) [ilog2((__force u32)RQF_##name)] = #name
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static const char *const rqf_name[] = {
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RQF_NAME(SORTED),
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RQF_NAME(STARTED),
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RQF_NAME(SOFTBARRIER),
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RQF_NAME(FLUSH_SEQ),
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RQF_NAME(MIXED_MERGE),
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RQF_NAME(MQ_INFLIGHT),
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RQF_NAME(DONTPREP),
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RQF_NAME(PREEMPT),
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RQF_NAME(COPY_USER),
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RQF_NAME(FAILED),
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RQF_NAME(QUIET),
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RQF_NAME(ELVPRIV),
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RQF_NAME(IO_STAT),
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RQF_NAME(ALLOCED),
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RQF_NAME(PM),
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RQF_NAME(HASHED),
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RQF_NAME(STATS),
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RQF_NAME(SPECIAL_PAYLOAD),
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RQF_NAME(ZONE_WRITE_LOCKED),
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RQF_NAME(MQ_POLL_SLEPT),
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};
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#undef RQF_NAME
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static const char *const blk_mq_rq_state_name_array[] = {
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[MQ_RQ_IDLE] = "idle",
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[MQ_RQ_IN_FLIGHT] = "in_flight",
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[MQ_RQ_COMPLETE] = "complete",
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};
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static const char *blk_mq_rq_state_name(enum mq_rq_state rq_state)
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{
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if (WARN_ON_ONCE((unsigned int)rq_state >=
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ARRAY_SIZE(blk_mq_rq_state_name_array)))
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return "(?)";
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return blk_mq_rq_state_name_array[rq_state];
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}
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int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
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{
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const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
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const unsigned int op = req_op(rq);
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const char *op_str = blk_op_str(op);
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seq_printf(m, "%p {.op=", rq);
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if (strcmp(op_str, "UNKNOWN") == 0)
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seq_printf(m, "%u", op);
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else
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seq_printf(m, "%s", op_str);
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seq_puts(m, ", .cmd_flags=");
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blk_flags_show(m, rq->cmd_flags & ~REQ_OP_MASK, cmd_flag_name,
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ARRAY_SIZE(cmd_flag_name));
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seq_puts(m, ", .rq_flags=");
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blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
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ARRAY_SIZE(rqf_name));
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seq_printf(m, ", .state=%s", blk_mq_rq_state_name(blk_mq_rq_state(rq)));
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seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
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rq->internal_tag);
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if (mq_ops->show_rq)
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mq_ops->show_rq(m, rq);
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seq_puts(m, "}\n");
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return 0;
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}
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EXPORT_SYMBOL_GPL(__blk_mq_debugfs_rq_show);
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int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
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{
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return __blk_mq_debugfs_rq_show(m, list_entry_rq(v));
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}
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EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
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static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
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__acquires(&hctx->lock)
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{
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struct blk_mq_hw_ctx *hctx = m->private;
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spin_lock(&hctx->lock);
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return seq_list_start(&hctx->dispatch, *pos);
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}
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static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos)
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{
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struct blk_mq_hw_ctx *hctx = m->private;
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return seq_list_next(v, &hctx->dispatch, pos);
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}
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static void hctx_dispatch_stop(struct seq_file *m, void *v)
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__releases(&hctx->lock)
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{
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struct blk_mq_hw_ctx *hctx = m->private;
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spin_unlock(&hctx->lock);
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}
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static const struct seq_operations hctx_dispatch_seq_ops = {
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.start = hctx_dispatch_start,
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.next = hctx_dispatch_next,
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.stop = hctx_dispatch_stop,
|
|
.show = blk_mq_debugfs_rq_show,
|
|
};
|
|
|
|
struct show_busy_params {
|
|
struct seq_file *m;
|
|
struct blk_mq_hw_ctx *hctx;
|
|
};
|
|
|
|
/*
|
|
* Note: the state of a request may change while this function is in progress,
|
|
* e.g. due to a concurrent blk_mq_finish_request() call. Returns true to
|
|
* keep iterating requests.
|
|
*/
|
|
static bool hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
|
|
{
|
|
const struct show_busy_params *params = data;
|
|
|
|
if (rq->mq_hctx == params->hctx)
|
|
__blk_mq_debugfs_rq_show(params->m,
|
|
list_entry_rq(&rq->queuelist));
|
|
|
|
return true;
|
|
}
|
|
|
|
static int hctx_busy_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
struct show_busy_params params = { .m = m, .hctx = hctx };
|
|
|
|
blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
|
|
¶ms);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char *const hctx_types[] = {
|
|
[HCTX_TYPE_DEFAULT] = "default",
|
|
[HCTX_TYPE_READ] = "read",
|
|
[HCTX_TYPE_POLL] = "poll",
|
|
};
|
|
|
|
static int hctx_type_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
BUILD_BUG_ON(ARRAY_SIZE(hctx_types) != HCTX_MAX_TYPES);
|
|
seq_printf(m, "%s\n", hctx_types[hctx->type]);
|
|
return 0;
|
|
}
|
|
|
|
static int hctx_ctx_map_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
sbitmap_bitmap_show(&hctx->ctx_map, m);
|
|
return 0;
|
|
}
|
|
|
|
static void blk_mq_debugfs_tags_show(struct seq_file *m,
|
|
struct blk_mq_tags *tags)
|
|
{
|
|
seq_printf(m, "nr_tags=%u\n", tags->nr_tags);
|
|
seq_printf(m, "nr_reserved_tags=%u\n", tags->nr_reserved_tags);
|
|
seq_printf(m, "active_queues=%d\n",
|
|
atomic_read(&tags->active_queues));
|
|
|
|
seq_puts(m, "\nbitmap_tags:\n");
|
|
sbitmap_queue_show(&tags->bitmap_tags, m);
|
|
|
|
if (tags->nr_reserved_tags) {
|
|
seq_puts(m, "\nbreserved_tags:\n");
|
|
sbitmap_queue_show(&tags->breserved_tags, m);
|
|
}
|
|
}
|
|
|
|
static int hctx_tags_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
struct request_queue *q = hctx->queue;
|
|
int res;
|
|
|
|
res = mutex_lock_interruptible(&q->sysfs_lock);
|
|
if (res)
|
|
goto out;
|
|
if (hctx->tags)
|
|
blk_mq_debugfs_tags_show(m, hctx->tags);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
struct request_queue *q = hctx->queue;
|
|
int res;
|
|
|
|
res = mutex_lock_interruptible(&q->sysfs_lock);
|
|
if (res)
|
|
goto out;
|
|
if (hctx->tags)
|
|
sbitmap_bitmap_show(&hctx->tags->bitmap_tags.sb, m);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static int hctx_sched_tags_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
struct request_queue *q = hctx->queue;
|
|
int res;
|
|
|
|
res = mutex_lock_interruptible(&q->sysfs_lock);
|
|
if (res)
|
|
goto out;
|
|
if (hctx->sched_tags)
|
|
blk_mq_debugfs_tags_show(m, hctx->sched_tags);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
struct request_queue *q = hctx->queue;
|
|
int res;
|
|
|
|
res = mutex_lock_interruptible(&q->sysfs_lock);
|
|
if (res)
|
|
goto out;
|
|
if (hctx->sched_tags)
|
|
sbitmap_bitmap_show(&hctx->sched_tags->bitmap_tags.sb, m);
|
|
mutex_unlock(&q->sysfs_lock);
|
|
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static int hctx_io_poll_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
seq_printf(m, "considered=%lu\n", hctx->poll_considered);
|
|
seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
|
|
seq_printf(m, "success=%lu\n", hctx->poll_success);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
|
|
return count;
|
|
}
|
|
|
|
static int hctx_dispatched_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
int i;
|
|
|
|
seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
|
|
|
|
for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER - 1; i++) {
|
|
unsigned int d = 1U << (i - 1);
|
|
|
|
seq_printf(m, "%8u\t%lu\n", d, hctx->dispatched[i]);
|
|
}
|
|
|
|
seq_printf(m, "%8u+\t%lu\n", 1U << (i - 1), hctx->dispatched[i]);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
int i;
|
|
|
|
for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
|
|
hctx->dispatched[i] = 0;
|
|
return count;
|
|
}
|
|
|
|
static int hctx_queued_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
seq_printf(m, "%lu\n", hctx->queued);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hctx_queued_write(void *data, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
hctx->queued = 0;
|
|
return count;
|
|
}
|
|
|
|
static int hctx_run_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
seq_printf(m, "%lu\n", hctx->run);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
|
|
loff_t *ppos)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
hctx->run = 0;
|
|
return count;
|
|
}
|
|
|
|
static int hctx_active_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
|
|
return 0;
|
|
}
|
|
|
|
static int hctx_dispatch_busy_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx = data;
|
|
|
|
seq_printf(m, "%u\n", hctx->dispatch_busy);
|
|
return 0;
|
|
}
|
|
|
|
#define CTX_RQ_SEQ_OPS(name, type) \
|
|
static void *ctx_##name##_rq_list_start(struct seq_file *m, loff_t *pos) \
|
|
__acquires(&ctx->lock) \
|
|
{ \
|
|
struct blk_mq_ctx *ctx = m->private; \
|
|
\
|
|
spin_lock(&ctx->lock); \
|
|
return seq_list_start(&ctx->rq_lists[type], *pos); \
|
|
} \
|
|
\
|
|
static void *ctx_##name##_rq_list_next(struct seq_file *m, void *v, \
|
|
loff_t *pos) \
|
|
{ \
|
|
struct blk_mq_ctx *ctx = m->private; \
|
|
\
|
|
return seq_list_next(v, &ctx->rq_lists[type], pos); \
|
|
} \
|
|
\
|
|
static void ctx_##name##_rq_list_stop(struct seq_file *m, void *v) \
|
|
__releases(&ctx->lock) \
|
|
{ \
|
|
struct blk_mq_ctx *ctx = m->private; \
|
|
\
|
|
spin_unlock(&ctx->lock); \
|
|
} \
|
|
\
|
|
static const struct seq_operations ctx_##name##_rq_list_seq_ops = { \
|
|
.start = ctx_##name##_rq_list_start, \
|
|
.next = ctx_##name##_rq_list_next, \
|
|
.stop = ctx_##name##_rq_list_stop, \
|
|
.show = blk_mq_debugfs_rq_show, \
|
|
}
|
|
|
|
CTX_RQ_SEQ_OPS(default, HCTX_TYPE_DEFAULT);
|
|
CTX_RQ_SEQ_OPS(read, HCTX_TYPE_READ);
|
|
CTX_RQ_SEQ_OPS(poll, HCTX_TYPE_POLL);
|
|
|
|
static int ctx_dispatched_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_ctx *ctx = data;
|
|
|
|
seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct blk_mq_ctx *ctx = data;
|
|
|
|
ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
|
|
return count;
|
|
}
|
|
|
|
static int ctx_merged_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_ctx *ctx = data;
|
|
|
|
seq_printf(m, "%lu\n", ctx->rq_merged);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ctx_merged_write(void *data, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct blk_mq_ctx *ctx = data;
|
|
|
|
ctx->rq_merged = 0;
|
|
return count;
|
|
}
|
|
|
|
static int ctx_completed_show(void *data, struct seq_file *m)
|
|
{
|
|
struct blk_mq_ctx *ctx = data;
|
|
|
|
seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t ctx_completed_write(void *data, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct blk_mq_ctx *ctx = data;
|
|
|
|
ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
|
|
return count;
|
|
}
|
|
|
|
static int blk_mq_debugfs_show(struct seq_file *m, void *v)
|
|
{
|
|
const struct blk_mq_debugfs_attr *attr = m->private;
|
|
void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
|
|
|
|
return attr->show(data, m);
|
|
}
|
|
|
|
static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct seq_file *m = file->private_data;
|
|
const struct blk_mq_debugfs_attr *attr = m->private;
|
|
void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
|
|
|
|
/*
|
|
* Attributes that only implement .seq_ops are read-only and 'attr' is
|
|
* the same with 'data' in this case.
|
|
*/
|
|
if (attr == data || !attr->write)
|
|
return -EPERM;
|
|
|
|
return attr->write(data, buf, count, ppos);
|
|
}
|
|
|
|
static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
|
|
{
|
|
const struct blk_mq_debugfs_attr *attr = inode->i_private;
|
|
void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
|
|
struct seq_file *m;
|
|
int ret;
|
|
|
|
if (attr->seq_ops) {
|
|
ret = seq_open(file, attr->seq_ops);
|
|
if (!ret) {
|
|
m = file->private_data;
|
|
m->private = data;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
if (WARN_ON_ONCE(!attr->show))
|
|
return -EPERM;
|
|
|
|
return single_open(file, blk_mq_debugfs_show, inode->i_private);
|
|
}
|
|
|
|
static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
|
|
{
|
|
const struct blk_mq_debugfs_attr *attr = inode->i_private;
|
|
|
|
if (attr->show)
|
|
return single_release(inode, file);
|
|
|
|
return seq_release(inode, file);
|
|
}
|
|
|
|
static const struct file_operations blk_mq_debugfs_fops = {
|
|
.open = blk_mq_debugfs_open,
|
|
.read = seq_read,
|
|
.write = blk_mq_debugfs_write,
|
|
.llseek = seq_lseek,
|
|
.release = blk_mq_debugfs_release,
|
|
};
|
|
|
|
static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
|
|
{"state", 0400, hctx_state_show},
|
|
{"flags", 0400, hctx_flags_show},
|
|
{"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
|
|
{"busy", 0400, hctx_busy_show},
|
|
{"ctx_map", 0400, hctx_ctx_map_show},
|
|
{"tags", 0400, hctx_tags_show},
|
|
{"tags_bitmap", 0400, hctx_tags_bitmap_show},
|
|
{"sched_tags", 0400, hctx_sched_tags_show},
|
|
{"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
|
|
{"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
|
|
{"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
|
|
{"queued", 0600, hctx_queued_show, hctx_queued_write},
|
|
{"run", 0600, hctx_run_show, hctx_run_write},
|
|
{"active", 0400, hctx_active_show},
|
|
{"dispatch_busy", 0400, hctx_dispatch_busy_show},
|
|
{"type", 0400, hctx_type_show},
|
|
{},
|
|
};
|
|
|
|
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
|
|
{"default_rq_list", 0400, .seq_ops = &ctx_default_rq_list_seq_ops},
|
|
{"read_rq_list", 0400, .seq_ops = &ctx_read_rq_list_seq_ops},
|
|
{"poll_rq_list", 0400, .seq_ops = &ctx_poll_rq_list_seq_ops},
|
|
{"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
|
|
{"merged", 0600, ctx_merged_show, ctx_merged_write},
|
|
{"completed", 0600, ctx_completed_show, ctx_completed_write},
|
|
{},
|
|
};
|
|
|
|
static void debugfs_create_files(struct dentry *parent, void *data,
|
|
const struct blk_mq_debugfs_attr *attr)
|
|
{
|
|
if (IS_ERR_OR_NULL(parent))
|
|
return;
|
|
|
|
d_inode(parent)->i_private = data;
|
|
|
|
for (; attr->name; attr++)
|
|
debugfs_create_file(attr->name, attr->mode, parent,
|
|
(void *)attr, &blk_mq_debugfs_fops);
|
|
}
|
|
|
|
void blk_mq_debugfs_register(struct request_queue *q)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx;
|
|
int i;
|
|
|
|
q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
|
|
blk_debugfs_root);
|
|
|
|
debugfs_create_files(q->debugfs_dir, q, blk_mq_debugfs_queue_attrs);
|
|
|
|
/*
|
|
* blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
|
|
* didn't exist yet (because we don't know what to name the directory
|
|
* until the queue is registered to a gendisk).
|
|
*/
|
|
if (q->elevator && !q->sched_debugfs_dir)
|
|
blk_mq_debugfs_register_sched(q);
|
|
|
|
/* Similarly, blk_mq_init_hctx() couldn't do this previously. */
|
|
queue_for_each_hw_ctx(q, hctx, i) {
|
|
if (!hctx->debugfs_dir)
|
|
blk_mq_debugfs_register_hctx(q, hctx);
|
|
if (q->elevator && !hctx->sched_debugfs_dir)
|
|
blk_mq_debugfs_register_sched_hctx(q, hctx);
|
|
}
|
|
|
|
if (q->rq_qos) {
|
|
struct rq_qos *rqos = q->rq_qos;
|
|
|
|
while (rqos) {
|
|
blk_mq_debugfs_register_rqos(rqos);
|
|
rqos = rqos->next;
|
|
}
|
|
}
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister(struct request_queue *q)
|
|
{
|
|
debugfs_remove_recursive(q->debugfs_dir);
|
|
q->sched_debugfs_dir = NULL;
|
|
q->debugfs_dir = NULL;
|
|
}
|
|
|
|
static void blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
|
|
struct blk_mq_ctx *ctx)
|
|
{
|
|
struct dentry *ctx_dir;
|
|
char name[20];
|
|
|
|
snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
|
|
ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
|
|
|
|
debugfs_create_files(ctx_dir, ctx, blk_mq_debugfs_ctx_attrs);
|
|
}
|
|
|
|
void blk_mq_debugfs_register_hctx(struct request_queue *q,
|
|
struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
struct blk_mq_ctx *ctx;
|
|
char name[20];
|
|
int i;
|
|
|
|
snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
|
|
hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
|
|
|
|
debugfs_create_files(hctx->debugfs_dir, hctx, blk_mq_debugfs_hctx_attrs);
|
|
|
|
hctx_for_each_ctx(hctx, ctx, i)
|
|
blk_mq_debugfs_register_ctx(hctx, ctx);
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
debugfs_remove_recursive(hctx->debugfs_dir);
|
|
hctx->sched_debugfs_dir = NULL;
|
|
hctx->debugfs_dir = NULL;
|
|
}
|
|
|
|
void blk_mq_debugfs_register_hctxs(struct request_queue *q)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx;
|
|
int i;
|
|
|
|
queue_for_each_hw_ctx(q, hctx, i)
|
|
blk_mq_debugfs_register_hctx(q, hctx);
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
|
|
{
|
|
struct blk_mq_hw_ctx *hctx;
|
|
int i;
|
|
|
|
queue_for_each_hw_ctx(q, hctx, i)
|
|
blk_mq_debugfs_unregister_hctx(hctx);
|
|
}
|
|
|
|
void blk_mq_debugfs_register_sched(struct request_queue *q)
|
|
{
|
|
struct elevator_type *e = q->elevator->type;
|
|
|
|
/*
|
|
* If the parent directory has not been created yet, return, we will be
|
|
* called again later on and the directory/files will be created then.
|
|
*/
|
|
if (!q->debugfs_dir)
|
|
return;
|
|
|
|
if (!e->queue_debugfs_attrs)
|
|
return;
|
|
|
|
q->sched_debugfs_dir = debugfs_create_dir("sched", q->debugfs_dir);
|
|
|
|
debugfs_create_files(q->sched_debugfs_dir, q, e->queue_debugfs_attrs);
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister_sched(struct request_queue *q)
|
|
{
|
|
debugfs_remove_recursive(q->sched_debugfs_dir);
|
|
q->sched_debugfs_dir = NULL;
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister_rqos(struct rq_qos *rqos)
|
|
{
|
|
debugfs_remove_recursive(rqos->debugfs_dir);
|
|
rqos->debugfs_dir = NULL;
|
|
}
|
|
|
|
void blk_mq_debugfs_register_rqos(struct rq_qos *rqos)
|
|
{
|
|
struct request_queue *q = rqos->q;
|
|
const char *dir_name = rq_qos_id_to_name(rqos->id);
|
|
|
|
if (rqos->debugfs_dir || !rqos->ops->debugfs_attrs)
|
|
return;
|
|
|
|
if (!q->rqos_debugfs_dir)
|
|
q->rqos_debugfs_dir = debugfs_create_dir("rqos",
|
|
q->debugfs_dir);
|
|
|
|
rqos->debugfs_dir = debugfs_create_dir(dir_name,
|
|
rqos->q->rqos_debugfs_dir);
|
|
|
|
debugfs_create_files(rqos->debugfs_dir, rqos, rqos->ops->debugfs_attrs);
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister_queue_rqos(struct request_queue *q)
|
|
{
|
|
debugfs_remove_recursive(q->rqos_debugfs_dir);
|
|
q->rqos_debugfs_dir = NULL;
|
|
}
|
|
|
|
void blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
|
|
struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
struct elevator_type *e = q->elevator->type;
|
|
|
|
if (!e->hctx_debugfs_attrs)
|
|
return;
|
|
|
|
hctx->sched_debugfs_dir = debugfs_create_dir("sched",
|
|
hctx->debugfs_dir);
|
|
debugfs_create_files(hctx->sched_debugfs_dir, hctx,
|
|
e->hctx_debugfs_attrs);
|
|
}
|
|
|
|
void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
debugfs_remove_recursive(hctx->sched_debugfs_dir);
|
|
hctx->sched_debugfs_dir = NULL;
|
|
}
|