| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Functions related to sysfs handling |
| */ |
| #include <linux/kernel.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <linux/bio.h> |
| #include <linux/blkdev.h> |
| #include <linux/backing-dev.h> |
| #include <linux/blktrace_api.h> |
| #include <linux/blk-mq.h> |
| #include <linux/blk-cgroup.h> |
| |
| #include "blk.h" |
| #include "blk-mq.h" |
| #include "blk-mq-debugfs.h" |
| #include "blk-wbt.h" |
| |
| struct queue_sysfs_entry { |
| struct attribute attr; |
| ssize_t (*show)(struct request_queue *, char *); |
| ssize_t (*store)(struct request_queue *, const char *, size_t); |
| }; |
| |
| static ssize_t |
| queue_var_show(unsigned long var, char *page) |
| { |
| return sprintf(page, "%lu\n", var); |
| } |
| |
| static ssize_t |
| queue_var_store(unsigned long *var, const char *page, size_t count) |
| { |
| int err; |
| unsigned long v; |
| |
| err = kstrtoul(page, 10, &v); |
| if (err || v > UINT_MAX) |
| return -EINVAL; |
| |
| *var = v; |
| |
| return count; |
| } |
| |
| static ssize_t queue_var_store64(s64 *var, const char *page) |
| { |
| int err; |
| s64 v; |
| |
| err = kstrtos64(page, 10, &v); |
| if (err < 0) |
| return err; |
| |
| *var = v; |
| return 0; |
| } |
| |
| static ssize_t queue_requests_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(q->nr_requests, (page)); |
| } |
| |
| static ssize_t |
| queue_requests_store(struct request_queue *q, const char *page, size_t count) |
| { |
| unsigned long nr; |
| int ret, err; |
| |
| if (!q->request_fn && !q->mq_ops) |
| return -EINVAL; |
| |
| ret = queue_var_store(&nr, page, count); |
| if (ret < 0) |
| return ret; |
| |
| if (nr < BLKDEV_MIN_RQ) |
| nr = BLKDEV_MIN_RQ; |
| |
| if (q->request_fn) |
| err = blk_update_nr_requests(q, nr); |
| else |
| err = blk_mq_update_nr_requests(q, nr); |
| |
| if (err) |
| return err; |
| |
| return ret; |
| } |
| |
| static ssize_t queue_ra_show(struct request_queue *q, char *page) |
| { |
| unsigned long ra_kb = q->backing_dev_info->ra_pages << |
| (PAGE_SHIFT - 10); |
| |
| return queue_var_show(ra_kb, (page)); |
| } |
| |
| static ssize_t |
| queue_ra_store(struct request_queue *q, const char *page, size_t count) |
| { |
| unsigned long ra_kb; |
| ssize_t ret = queue_var_store(&ra_kb, page, count); |
| |
| if (ret < 0) |
| return ret; |
| |
| q->backing_dev_info->ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
| |
| return ret; |
| } |
| |
| static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) |
| { |
| int max_sectors_kb = queue_max_sectors(q) >> 1; |
| |
| return queue_var_show(max_sectors_kb, (page)); |
| } |
| |
| static ssize_t queue_max_segments_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(queue_max_segments(q), (page)); |
| } |
| |
| static ssize_t queue_max_discard_segments_show(struct request_queue *q, |
| char *page) |
| { |
| return queue_var_show(queue_max_discard_segments(q), (page)); |
| } |
| |
| static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(q->limits.max_integrity_segments, (page)); |
| } |
| |
| static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(queue_max_segment_size(q), (page)); |
| } |
| |
| static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(queue_logical_block_size(q), page); |
| } |
| |
| static ssize_t queue_physical_block_size_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(queue_physical_block_size(q), page); |
| } |
| |
| static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(q->limits.chunk_sectors, page); |
| } |
| |
| static ssize_t queue_io_min_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(queue_io_min(q), page); |
| } |
| |
| static ssize_t queue_io_opt_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(queue_io_opt(q), page); |
| } |
| |
| static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(q->limits.discard_granularity, page); |
| } |
| |
| static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) |
| { |
| |
| return sprintf(page, "%llu\n", |
| (unsigned long long)q->limits.max_hw_discard_sectors << 9); |
| } |
| |
| static ssize_t queue_discard_max_show(struct request_queue *q, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long)q->limits.max_discard_sectors << 9); |
| } |
| |
| static ssize_t queue_discard_max_store(struct request_queue *q, |
| const char *page, size_t count) |
| { |
| unsigned long max_discard; |
| ssize_t ret = queue_var_store(&max_discard, page, count); |
| |
| if (ret < 0) |
| return ret; |
| |
| if (max_discard & (q->limits.discard_granularity - 1)) |
| return -EINVAL; |
| |
| max_discard >>= 9; |
| if (max_discard > UINT_MAX) |
| return -EINVAL; |
| |
| if (max_discard > q->limits.max_hw_discard_sectors) |
| max_discard = q->limits.max_hw_discard_sectors; |
| |
| q->limits.max_discard_sectors = max_discard; |
| return ret; |
| } |
| |
| static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(0, page); |
| } |
| |
| static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long)q->limits.max_write_same_sectors << 9); |
| } |
| |
| static ssize_t queue_write_zeroes_max_show(struct request_queue *q, char *page) |
| { |
| return sprintf(page, "%llu\n", |
| (unsigned long long)q->limits.max_write_zeroes_sectors << 9); |
| } |
| |
| static ssize_t |
| queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) |
| { |
| unsigned long max_sectors_kb, |
| max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
| page_kb = 1 << (PAGE_SHIFT - 10); |
| ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
| |
| if (ret < 0) |
| return ret; |
| |
| max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) |
| q->limits.max_dev_sectors >> 1); |
| |
| if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) |
| return -EINVAL; |
| |
| spin_lock_irq(q->queue_lock); |
| q->limits.max_sectors = max_sectors_kb << 1; |
| q->backing_dev_info->io_pages = max_sectors_kb >> (PAGE_SHIFT - 10); |
| spin_unlock_irq(q->queue_lock); |
| |
| return ret; |
| } |
| |
| static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) |
| { |
| int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
| |
| return queue_var_show(max_hw_sectors_kb, (page)); |
| } |
| |
| #define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \ |
| static ssize_t \ |
| queue_show_##name(struct request_queue *q, char *page) \ |
| { \ |
| int bit; \ |
| bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \ |
| return queue_var_show(neg ? !bit : bit, page); \ |
| } \ |
| static ssize_t \ |
| queue_store_##name(struct request_queue *q, const char *page, size_t count) \ |
| { \ |
| unsigned long val; \ |
| ssize_t ret; \ |
| ret = queue_var_store(&val, page, count); \ |
| if (ret < 0) \ |
| return ret; \ |
| if (neg) \ |
| val = !val; \ |
| \ |
| if (val) \ |
| blk_queue_flag_set(QUEUE_FLAG_##flag, q); \ |
| else \ |
| blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \ |
| return ret; \ |
| } |
| |
| QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1); |
| QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0); |
| QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0); |
| #undef QUEUE_SYSFS_BIT_FNS |
| |
| static ssize_t queue_zoned_show(struct request_queue *q, char *page) |
| { |
| switch (blk_queue_zoned_model(q)) { |
| case BLK_ZONED_HA: |
| return sprintf(page, "host-aware\n"); |
| case BLK_ZONED_HM: |
| return sprintf(page, "host-managed\n"); |
| default: |
| return sprintf(page, "none\n"); |
| } |
| } |
| |
| static ssize_t queue_nr_zones_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(blk_queue_nr_zones(q), page); |
| } |
| |
| static ssize_t queue_nomerges_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show((blk_queue_nomerges(q) << 1) | |
| blk_queue_noxmerges(q), page); |
| } |
| |
| static ssize_t queue_nomerges_store(struct request_queue *q, const char *page, |
| size_t count) |
| { |
| unsigned long nm; |
| ssize_t ret = queue_var_store(&nm, page, count); |
| |
| if (ret < 0) |
| return ret; |
| |
| spin_lock_irq(q->queue_lock); |
| queue_flag_clear(QUEUE_FLAG_NOMERGES, q); |
| queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); |
| if (nm == 2) |
| queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
| else if (nm) |
| queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
| spin_unlock_irq(q->queue_lock); |
| |
| return ret; |
| } |
| |
| static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) |
| { |
| bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
| bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
| |
| return queue_var_show(set << force, page); |
| } |
| |
| static ssize_t |
| queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) |
| { |
| ssize_t ret = -EINVAL; |
| #ifdef CONFIG_SMP |
| unsigned long val; |
| |
| ret = queue_var_store(&val, page, count); |
| if (ret < 0) |
| return ret; |
| |
| spin_lock_irq(q->queue_lock); |
| if (val == 2) { |
| queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
| queue_flag_set(QUEUE_FLAG_SAME_FORCE, q); |
| } else if (val == 1) { |
| queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
| queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); |
| } else if (val == 0) { |
| queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); |
| queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); |
| } |
| spin_unlock_irq(q->queue_lock); |
| #endif |
| return ret; |
| } |
| |
| static ssize_t queue_poll_delay_show(struct request_queue *q, char *page) |
| { |
| int val; |
| |
| if (q->poll_nsec == -1) |
| val = -1; |
| else |
| val = q->poll_nsec / 1000; |
| |
| return sprintf(page, "%d\n", val); |
| } |
| |
| static ssize_t queue_poll_delay_store(struct request_queue *q, const char *page, |
| size_t count) |
| { |
| int err, val; |
| |
| if (!q->mq_ops || !q->mq_ops->poll) |
| return -EINVAL; |
| |
| err = kstrtoint(page, 10, &val); |
| if (err < 0) |
| return err; |
| |
| if (val == -1) |
| q->poll_nsec = -1; |
| else |
| q->poll_nsec = val * 1000; |
| |
| return count; |
| } |
| |
| static ssize_t queue_poll_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); |
| } |
| |
| static ssize_t queue_poll_store(struct request_queue *q, const char *page, |
| size_t count) |
| { |
| unsigned long poll_on; |
| ssize_t ret; |
| |
| if (!q->mq_ops || !q->mq_ops->poll) |
| return -EINVAL; |
| |
| ret = queue_var_store(&poll_on, page, count); |
| if (ret < 0) |
| return ret; |
| |
| if (poll_on) |
| blk_queue_flag_set(QUEUE_FLAG_POLL, q); |
| else |
| blk_queue_flag_clear(QUEUE_FLAG_POLL, q); |
| |
| return ret; |
| } |
| |
| static ssize_t queue_wb_lat_show(struct request_queue *q, char *page) |
| { |
| if (!wbt_rq_qos(q)) |
| return -EINVAL; |
| |
| return sprintf(page, "%llu\n", div_u64(wbt_get_min_lat(q), 1000)); |
| } |
| |
| static ssize_t queue_wb_lat_store(struct request_queue *q, const char *page, |
| size_t count) |
| { |
| struct rq_qos *rqos; |
| ssize_t ret; |
| s64 val; |
| |
| ret = queue_var_store64(&val, page); |
| if (ret < 0) |
| return ret; |
| if (val < -1) |
| return -EINVAL; |
| |
| rqos = wbt_rq_qos(q); |
| if (!rqos) { |
| ret = wbt_init(q); |
| if (ret) |
| return ret; |
| } |
| |
| if (val == -1) |
| val = wbt_default_latency_nsec(q); |
| else if (val >= 0) |
| val *= 1000ULL; |
| |
| /* |
| * Ensure that the queue is idled, in case the latency update |
| * ends up either enabling or disabling wbt completely. We can't |
| * have IO inflight if that happens. |
| */ |
| if (q->mq_ops) { |
| blk_mq_freeze_queue(q); |
| blk_mq_quiesce_queue(q); |
| } else |
| blk_queue_bypass_start(q); |
| |
| wbt_set_min_lat(q, val); |
| wbt_update_limits(q); |
| |
| if (q->mq_ops) { |
| blk_mq_unquiesce_queue(q); |
| blk_mq_unfreeze_queue(q); |
| } else |
| blk_queue_bypass_end(q); |
| |
| return count; |
| } |
| |
| static ssize_t queue_wc_show(struct request_queue *q, char *page) |
| { |
| if (test_bit(QUEUE_FLAG_WC, &q->queue_flags)) |
| return sprintf(page, "write back\n"); |
| |
| return sprintf(page, "write through\n"); |
| } |
| |
| static ssize_t queue_wc_store(struct request_queue *q, const char *page, |
| size_t count) |
| { |
| int set = -1; |
| |
| if (!strncmp(page, "write back", 10)) |
| set = 1; |
| else if (!strncmp(page, "write through", 13) || |
| !strncmp(page, "none", 4)) |
| set = 0; |
| |
| if (set == -1) |
| return -EINVAL; |
| |
| if (set) |
| blk_queue_flag_set(QUEUE_FLAG_WC, q); |
| else |
| blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
| |
| return count; |
| } |
| |
| static ssize_t queue_fua_show(struct request_queue *q, char *page) |
| { |
| return sprintf(page, "%u\n", test_bit(QUEUE_FLAG_FUA, &q->queue_flags)); |
| } |
| |
| static ssize_t queue_dax_show(struct request_queue *q, char *page) |
| { |
| return queue_var_show(blk_queue_dax(q), page); |
| } |
| |
| static struct queue_sysfs_entry queue_requests_entry = { |
| .attr = {.name = "nr_requests", .mode = 0644 }, |
| .show = queue_requests_show, |
| .store = queue_requests_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_ra_entry = { |
| .attr = {.name = "read_ahead_kb", .mode = 0644 }, |
| .show = queue_ra_show, |
| .store = queue_ra_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_max_sectors_entry = { |
| .attr = {.name = "max_sectors_kb", .mode = 0644 }, |
| .show = queue_max_sectors_show, |
| .store = queue_max_sectors_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_max_hw_sectors_entry = { |
| .attr = {.name = "max_hw_sectors_kb", .mode = 0444 }, |
| .show = queue_max_hw_sectors_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_max_segments_entry = { |
| .attr = {.name = "max_segments", .mode = 0444 }, |
| .show = queue_max_segments_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_max_discard_segments_entry = { |
| .attr = {.name = "max_discard_segments", .mode = 0444 }, |
| .show = queue_max_discard_segments_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_max_integrity_segments_entry = { |
| .attr = {.name = "max_integrity_segments", .mode = 0444 }, |
| .show = queue_max_integrity_segments_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_max_segment_size_entry = { |
| .attr = {.name = "max_segment_size", .mode = 0444 }, |
| .show = queue_max_segment_size_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_iosched_entry = { |
| .attr = {.name = "scheduler", .mode = 0644 }, |
| .show = elv_iosched_show, |
| .store = elv_iosched_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_hw_sector_size_entry = { |
| .attr = {.name = "hw_sector_size", .mode = 0444 }, |
| .show = queue_logical_block_size_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_logical_block_size_entry = { |
| .attr = {.name = "logical_block_size", .mode = 0444 }, |
| .show = queue_logical_block_size_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_physical_block_size_entry = { |
| .attr = {.name = "physical_block_size", .mode = 0444 }, |
| .show = queue_physical_block_size_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_chunk_sectors_entry = { |
| .attr = {.name = "chunk_sectors", .mode = 0444 }, |
| .show = queue_chunk_sectors_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_io_min_entry = { |
| .attr = {.name = "minimum_io_size", .mode = 0444 }, |
| .show = queue_io_min_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_io_opt_entry = { |
| .attr = {.name = "optimal_io_size", .mode = 0444 }, |
| .show = queue_io_opt_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_discard_granularity_entry = { |
| .attr = {.name = "discard_granularity", .mode = 0444 }, |
| .show = queue_discard_granularity_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_discard_max_hw_entry = { |
| .attr = {.name = "discard_max_hw_bytes", .mode = 0444 }, |
| .show = queue_discard_max_hw_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_discard_max_entry = { |
| .attr = {.name = "discard_max_bytes", .mode = 0644 }, |
| .show = queue_discard_max_show, |
| .store = queue_discard_max_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { |
| .attr = {.name = "discard_zeroes_data", .mode = 0444 }, |
| .show = queue_discard_zeroes_data_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_write_same_max_entry = { |
| .attr = {.name = "write_same_max_bytes", .mode = 0444 }, |
| .show = queue_write_same_max_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_write_zeroes_max_entry = { |
| .attr = {.name = "write_zeroes_max_bytes", .mode = 0444 }, |
| .show = queue_write_zeroes_max_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_nonrot_entry = { |
| .attr = {.name = "rotational", .mode = 0644 }, |
| .show = queue_show_nonrot, |
| .store = queue_store_nonrot, |
| }; |
| |
| static struct queue_sysfs_entry queue_zoned_entry = { |
| .attr = {.name = "zoned", .mode = 0444 }, |
| .show = queue_zoned_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_nr_zones_entry = { |
| .attr = {.name = "nr_zones", .mode = 0444 }, |
| .show = queue_nr_zones_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_nomerges_entry = { |
| .attr = {.name = "nomerges", .mode = 0644 }, |
| .show = queue_nomerges_show, |
| .store = queue_nomerges_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_rq_affinity_entry = { |
| .attr = {.name = "rq_affinity", .mode = 0644 }, |
| .show = queue_rq_affinity_show, |
| .store = queue_rq_affinity_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_iostats_entry = { |
| .attr = {.name = "iostats", .mode = 0644 }, |
| .show = queue_show_iostats, |
| .store = queue_store_iostats, |
| }; |
| |
| static struct queue_sysfs_entry queue_random_entry = { |
| .attr = {.name = "add_random", .mode = 0644 }, |
| .show = queue_show_random, |
| .store = queue_store_random, |
| }; |
| |
| static struct queue_sysfs_entry queue_poll_entry = { |
| .attr = {.name = "io_poll", .mode = 0644 }, |
| .show = queue_poll_show, |
| .store = queue_poll_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_poll_delay_entry = { |
| .attr = {.name = "io_poll_delay", .mode = 0644 }, |
| .show = queue_poll_delay_show, |
| .store = queue_poll_delay_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_wc_entry = { |
| .attr = {.name = "write_cache", .mode = 0644 }, |
| .show = queue_wc_show, |
| .store = queue_wc_store, |
| }; |
| |
| static struct queue_sysfs_entry queue_fua_entry = { |
| .attr = {.name = "fua", .mode = 0444 }, |
| .show = queue_fua_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_dax_entry = { |
| .attr = {.name = "dax", .mode = 0444 }, |
| .show = queue_dax_show, |
| }; |
| |
| static struct queue_sysfs_entry queue_wb_lat_entry = { |
| .attr = {.name = "wbt_lat_usec", .mode = 0644 }, |
| .show = queue_wb_lat_show, |
| .store = queue_wb_lat_store, |
| }; |
| |
| #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
| static struct queue_sysfs_entry throtl_sample_time_entry = { |
| .attr = {.name = "throttle_sample_time", .mode = 0644 }, |
| .show = blk_throtl_sample_time_show, |
| .store = blk_throtl_sample_time_store, |
| }; |
| #endif |
| |
| static struct attribute *default_attrs[] = { |
| &queue_requests_entry.attr, |
| &queue_ra_entry.attr, |
| &queue_max_hw_sectors_entry.attr, |
| &queue_max_sectors_entry.attr, |
| &queue_max_segments_entry.attr, |
| &queue_max_discard_segments_entry.attr, |
| &queue_max_integrity_segments_entry.attr, |
| &queue_max_segment_size_entry.attr, |
| &queue_iosched_entry.attr, |
| &queue_hw_sector_size_entry.attr, |
| &queue_logical_block_size_entry.attr, |
| &queue_physical_block_size_entry.attr, |
| &queue_chunk_sectors_entry.attr, |
| &queue_io_min_entry.attr, |
| &queue_io_opt_entry.attr, |
| &queue_discard_granularity_entry.attr, |
| &queue_discard_max_entry.attr, |
| &queue_discard_max_hw_entry.attr, |
| &queue_discard_zeroes_data_entry.attr, |
| &queue_write_same_max_entry.attr, |
| &queue_write_zeroes_max_entry.attr, |
| &queue_nonrot_entry.attr, |
| &queue_zoned_entry.attr, |
| &queue_nr_zones_entry.attr, |
| &queue_nomerges_entry.attr, |
| &queue_rq_affinity_entry.attr, |
| &queue_iostats_entry.attr, |
| &queue_random_entry.attr, |
| &queue_poll_entry.attr, |
| &queue_wc_entry.attr, |
| &queue_fua_entry.attr, |
| &queue_dax_entry.attr, |
| &queue_wb_lat_entry.attr, |
| &queue_poll_delay_entry.attr, |
| #ifdef CONFIG_BLK_DEV_THROTTLING_LOW |
| &throtl_sample_time_entry.attr, |
| #endif |
| NULL, |
| }; |
| |
| #define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr) |
| |
| static ssize_t |
| queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page) |
| { |
| struct queue_sysfs_entry *entry = to_queue(attr); |
| struct request_queue *q = |
| container_of(kobj, struct request_queue, kobj); |
| ssize_t res; |
| |
| if (!entry->show) |
| return -EIO; |
| mutex_lock(&q->sysfs_lock); |
| if (blk_queue_dying(q)) { |
| mutex_unlock(&q->sysfs_lock); |
| return -ENOENT; |
| } |
| res = entry->show(q, page); |
| mutex_unlock(&q->sysfs_lock); |
| return res; |
| } |
| |
| static ssize_t |
| queue_attr_store(struct kobject *kobj, struct attribute *attr, |
| const char *page, size_t length) |
| { |
| struct queue_sysfs_entry *entry = to_queue(attr); |
| struct request_queue *q; |
| ssize_t res; |
| |
| if (!entry->store) |
| return -EIO; |
| |
| q = container_of(kobj, struct request_queue, kobj); |
| mutex_lock(&q->sysfs_lock); |
| if (blk_queue_dying(q)) { |
| mutex_unlock(&q->sysfs_lock); |
| return -ENOENT; |
| } |
| res = entry->store(q, page, length); |
| mutex_unlock(&q->sysfs_lock); |
| return res; |
| } |
| |
| static void blk_free_queue_rcu(struct rcu_head *rcu_head) |
| { |
| struct request_queue *q = container_of(rcu_head, struct request_queue, |
| rcu_head); |
| kmem_cache_free(blk_requestq_cachep, q); |
| } |
| |
| /** |
| * __blk_release_queue - release a request queue when it is no longer needed |
| * @work: pointer to the release_work member of the request queue to be released |
| * |
| * Description: |
| * blk_release_queue is the counterpart of blk_init_queue(). It should be |
| * called when a request queue is being released; typically when a block |
| * device is being de-registered. Its primary task it to free the queue |
| * itself. |
| * |
| * Notes: |
| * The low level driver must have finished any outstanding requests first |
| * via blk_cleanup_queue(). |
| * |
| * Although blk_release_queue() may be called with preemption disabled, |
| * __blk_release_queue() may sleep. |
| */ |
| static void __blk_release_queue(struct work_struct *work) |
| { |
| struct request_queue *q = container_of(work, typeof(*q), release_work); |
| |
| if (test_bit(QUEUE_FLAG_POLL_STATS, &q->queue_flags)) |
| blk_stat_remove_callback(q, q->poll_cb); |
| blk_stat_free_callback(q->poll_cb); |
| |
| if (!blk_queue_dead(q)) { |
| /* |
| * Last reference was dropped without having called |
| * blk_cleanup_queue(). |
| */ |
| WARN_ONCE(blk_queue_init_done(q), |
| "request queue %p has been registered but blk_cleanup_queue() has not been called for that queue\n", |
| q); |
| blk_exit_queue(q); |
| } |
| |
| WARN(blk_queue_root_blkg(q), |
| "request queue %p is being released but it has not yet been removed from the blkcg controller\n", |
| q); |
| |
| blk_free_queue_stats(q->stats); |
| |
| blk_exit_rl(q, &q->root_rl); |
| |
| if (q->queue_tags) |
| __blk_queue_free_tags(q); |
| |
| blk_queue_free_zone_bitmaps(q); |
| |
| if (!q->mq_ops) { |
| if (q->exit_rq_fn) |
| q->exit_rq_fn(q, q->fq->flush_rq); |
| blk_free_flush_queue(q->fq); |
| } else { |
| blk_mq_release(q); |
| } |
| |
| blk_trace_shutdown(q); |
| |
| if (q->mq_ops) |
| blk_mq_debugfs_unregister(q); |
| |
| bioset_exit(&q->bio_split); |
| |
| ida_simple_remove(&blk_queue_ida, q->id); |
| call_rcu(&q->rcu_head, blk_free_queue_rcu); |
| } |
| |
| static void blk_release_queue(struct kobject *kobj) |
| { |
| struct request_queue *q = |
| container_of(kobj, struct request_queue, kobj); |
| |
| INIT_WORK(&q->release_work, __blk_release_queue); |
| schedule_work(&q->release_work); |
| } |
| |
| static const struct sysfs_ops queue_sysfs_ops = { |
| .show = queue_attr_show, |
| .store = queue_attr_store, |
| }; |
| |
| struct kobj_type blk_queue_ktype = { |
| .sysfs_ops = &queue_sysfs_ops, |
| .default_attrs = default_attrs, |
| .release = blk_release_queue, |
| }; |
| |
| /** |
| * blk_register_queue - register a block layer queue with sysfs |
| * @disk: Disk of which the request queue should be registered with sysfs. |
| */ |
| int blk_register_queue(struct gendisk *disk) |
| { |
| int ret; |
| struct device *dev = disk_to_dev(disk); |
| struct request_queue *q = disk->queue; |
| |
| if (WARN_ON(!q)) |
| return -ENXIO; |
| |
| WARN_ONCE(test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags), |
| "%s is registering an already registered queue\n", |
| kobject_name(&dev->kobj)); |
| queue_flag_set_unlocked(QUEUE_FLAG_REGISTERED, q); |
| |
| /* |
| * SCSI probing may synchronously create and destroy a lot of |
| * request_queues for non-existent devices. Shutting down a fully |
| * functional queue takes measureable wallclock time as RCU grace |
| * periods are involved. To avoid excessive latency in these |
| * cases, a request_queue starts out in a degraded mode which is |
| * faster to shut down and is made fully functional here as |
| * request_queues for non-existent devices never get registered. |
| */ |
| if (!blk_queue_init_done(q)) { |
| queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); |
| percpu_ref_switch_to_percpu(&q->q_usage_counter); |
| blk_queue_bypass_end(q); |
| } |
| |
| ret = blk_trace_init_sysfs(dev); |
| if (ret) |
| return ret; |
| |
| /* Prevent changes through sysfs until registration is completed. */ |
| mutex_lock(&q->sysfs_lock); |
| |
| ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
| if (ret < 0) { |
| blk_trace_remove_sysfs(dev); |
| goto unlock; |
| } |
| |
| if (q->mq_ops) { |
| __blk_mq_register_dev(dev, q); |
| blk_mq_debugfs_register(q); |
| } |
| |
| kobject_uevent(&q->kobj, KOBJ_ADD); |
| |
| wbt_enable_default(q); |
| |
| blk_throtl_register_queue(q); |
| |
| if (q->request_fn || (q->mq_ops && q->elevator)) { |
| ret = elv_register_queue(q); |
| if (ret) { |
| mutex_unlock(&q->sysfs_lock); |
| kobject_uevent(&q->kobj, KOBJ_REMOVE); |
| kobject_del(&q->kobj); |
| blk_trace_remove_sysfs(dev); |
| kobject_put(&dev->kobj); |
| return ret; |
| } |
| } |
| ret = 0; |
| unlock: |
| mutex_unlock(&q->sysfs_lock); |
| return ret; |
| } |
| EXPORT_SYMBOL_GPL(blk_register_queue); |
| |
| /** |
| * blk_unregister_queue - counterpart of blk_register_queue() |
| * @disk: Disk of which the request queue should be unregistered from sysfs. |
| * |
| * Note: the caller is responsible for guaranteeing that this function is called |
| * after blk_register_queue() has finished. |
| */ |
| void blk_unregister_queue(struct gendisk *disk) |
| { |
| struct request_queue *q = disk->queue; |
| |
| if (WARN_ON(!q)) |
| return; |
| |
| /* Return early if disk->queue was never registered. */ |
| if (!test_bit(QUEUE_FLAG_REGISTERED, &q->queue_flags)) |
| return; |
| |
| /* |
| * Since sysfs_remove_dir() prevents adding new directory entries |
| * before removal of existing entries starts, protect against |
| * concurrent elv_iosched_store() calls. |
| */ |
| mutex_lock(&q->sysfs_lock); |
| |
| blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q); |
| |
| /* |
| * Remove the sysfs attributes before unregistering the queue data |
| * structures that can be modified through sysfs. |
| */ |
| if (q->mq_ops) |
| blk_mq_unregister_dev(disk_to_dev(disk), q); |
| mutex_unlock(&q->sysfs_lock); |
| |
| kobject_uevent(&q->kobj, KOBJ_REMOVE); |
| kobject_del(&q->kobj); |
| blk_trace_remove_sysfs(disk_to_dev(disk)); |
| |
| mutex_lock(&q->sysfs_lock); |
| if (q->request_fn || (q->mq_ops && q->elevator)) |
| elv_unregister_queue(q); |
| mutex_unlock(&q->sysfs_lock); |
| |
| kobject_put(&disk_to_dev(disk)->kobj); |
| } |