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block/blk-sysfs.c
18.5 KB
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/* * Functions related to sysfs handling */ #include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/module.h> #include <linux/bio.h> #include <linux/blkdev.h> |
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#include <linux/backing-dev.h> |
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#include <linux/blktrace_api.h> |
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#include <linux/blk-mq.h> |
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#include <linux/blk-cgroup.h> |
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#include "blk.h" |
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#include "blk-mq.h" |
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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 |
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queue_var_show(unsigned long var, char *page) |
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{ |
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return sprintf(page, "%lu ", var); |
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} static ssize_t queue_var_store(unsigned long *var, const char *page, size_t count) { |
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int err; unsigned long v; |
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err = kstrtoul(page, 10, &v); |
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if (err || v > UINT_MAX) return -EINVAL; *var = v; |
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return count; } 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) { |
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unsigned long nr; |
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int ret, err; |
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if (!q->request_fn && !q->mq_ops) |
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return -EINVAL; ret = queue_var_store(&nr, page, count); |
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if (ret < 0) return ret; |
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if (nr < BLKDEV_MIN_RQ) nr = BLKDEV_MIN_RQ; |
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if (q->request_fn) err = blk_update_nr_requests(q, nr); else err = blk_mq_update_nr_requests(q, nr); if (err) return err; |
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return ret; } static ssize_t queue_ra_show(struct request_queue *q, char *page) { |
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unsigned long ra_kb = q->backing_dev_info.ra_pages << |
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(PAGE_SHIFT - 10); |
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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); |
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if (ret < 0) return ret; |
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q->backing_dev_info.ra_pages = ra_kb >> (PAGE_SHIFT - 10); |
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return ret; } static ssize_t queue_max_sectors_show(struct request_queue *q, char *page) { |
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int max_sectors_kb = queue_max_sectors(q) >> 1; |
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return queue_var_show(max_sectors_kb, (page)); } |
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static ssize_t queue_max_segments_show(struct request_queue *q, char *page) { return queue_var_show(queue_max_segments(q), (page)); } |
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static ssize_t queue_max_integrity_segments_show(struct request_queue *q, char *page) { return queue_var_show(q->limits.max_integrity_segments, (page)); } |
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static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page) { |
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if (blk_queue_cluster(q)) |
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return queue_var_show(queue_max_segment_size(q), (page)); |
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return queue_var_show(PAGE_SIZE, (page)); |
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} |
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static ssize_t queue_logical_block_size_show(struct request_queue *q, char *page) |
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{ |
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return queue_var_show(queue_logical_block_size(q), page); |
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} |
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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_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); |
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} |
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static ssize_t queue_discard_granularity_show(struct request_queue *q, char *page) { return queue_var_show(q->limits.discard_granularity, page); } |
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static ssize_t queue_discard_max_hw_show(struct request_queue *q, char *page) { |
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|
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return sprintf(page, "%llu ", (unsigned long long)q->limits.max_hw_discard_sectors << 9); |
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} |
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static ssize_t queue_discard_max_show(struct request_queue *q, char *page) { |
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return sprintf(page, "%llu ", (unsigned long long)q->limits.max_discard_sectors << 9); |
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} |
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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; } |
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static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page) { return queue_var_show(queue_discard_zeroes_data(q), page); } |
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static ssize_t queue_write_same_max_show(struct request_queue *q, char *page) { return sprintf(page, "%llu ", (unsigned long long)q->limits.max_write_same_sectors << 9); } |
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static ssize_t queue_max_sectors_store(struct request_queue *q, const char *page, size_t count) { unsigned long max_sectors_kb, |
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max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1, |
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page_kb = 1 << (PAGE_SHIFT - 10); |
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ssize_t ret = queue_var_store(&max_sectors_kb, page, count); |
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if (ret < 0) return ret; |
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max_hw_sectors_kb = min_not_zero(max_hw_sectors_kb, (unsigned long) q->limits.max_dev_sectors >> 1); |
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if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb) return -EINVAL; |
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spin_lock_irq(q->queue_lock); |
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q->limits.max_sectors = max_sectors_kb << 1; |
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spin_unlock_irq(q->queue_lock); return ret; } static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page) { |
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int max_hw_sectors_kb = queue_max_hw_sectors(q) >> 1; |
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return queue_var_show(max_hw_sectors_kb, (page)); } |
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#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); \ |
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if (ret < 0) \ return ret; \ |
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if (neg) \ val = !val; \ \ spin_lock_irq(q->queue_lock); \ if (val) \ queue_flag_set(QUEUE_FLAG_##flag, q); \ else \ queue_flag_clear(QUEUE_FLAG_##flag, q); \ spin_unlock_irq(q->queue_lock); \ return ret; \ |
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} |
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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 |
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static ssize_t queue_nomerges_show(struct request_queue *q, char *page) { |
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return queue_var_show((blk_queue_nomerges(q) << 1) | blk_queue_noxmerges(q), page); |
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} 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); |
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if (ret < 0) return ret; |
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spin_lock_irq(q->queue_lock); |
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queue_flag_clear(QUEUE_FLAG_NOMERGES, q); queue_flag_clear(QUEUE_FLAG_NOXMERGES, q); if (nm == 2) |
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queue_flag_set(QUEUE_FLAG_NOMERGES, q); |
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else if (nm) queue_flag_set(QUEUE_FLAG_NOXMERGES, q); |
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spin_unlock_irq(q->queue_lock); |
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return ret; } |
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static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page) { |
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bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags); |
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bool force = test_bit(QUEUE_FLAG_SAME_FORCE, &q->queue_flags); |
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return queue_var_show(set << force, page); |
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} static ssize_t queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) { ssize_t ret = -EINVAL; |
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#ifdef CONFIG_SMP |
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unsigned long val; ret = queue_var_store(&val, page, count); |
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if (ret < 0) return ret; |
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spin_lock_irq(q->queue_lock); |
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if (val == 2) { |
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queue_flag_set(QUEUE_FLAG_SAME_COMP, q); |
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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) { |
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queue_flag_clear(QUEUE_FLAG_SAME_COMP, q); queue_flag_clear(QUEUE_FLAG_SAME_FORCE, q); } |
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spin_unlock_irq(q->queue_lock); #endif return ret; } |
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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; spin_lock_irq(q->queue_lock); if (poll_on) queue_flag_set(QUEUE_FLAG_POLL, q); else queue_flag_clear(QUEUE_FLAG_POLL, q); spin_unlock_irq(q->queue_lock); return ret; } |
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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 "); return sprintf(page, "write through "); } 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; spin_lock_irq(q->queue_lock); if (set) queue_flag_set(QUEUE_FLAG_WC, q); else queue_flag_clear(QUEUE_FLAG_WC, q); spin_unlock_irq(q->queue_lock); return count; } |
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static ssize_t queue_dax_show(struct request_queue *q, char *page) { return queue_var_show(blk_queue_dax(q), page); } |
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static struct queue_sysfs_entry queue_requests_entry = { .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, .show = queue_requests_show, .store = queue_requests_store, }; static struct queue_sysfs_entry queue_ra_entry = { .attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR }, .show = queue_ra_show, .store = queue_ra_store, }; static struct queue_sysfs_entry queue_max_sectors_entry = { .attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR }, .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 = S_IRUGO }, .show = queue_max_hw_sectors_show, }; |
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static struct queue_sysfs_entry queue_max_segments_entry = { .attr = {.name = "max_segments", .mode = S_IRUGO }, .show = queue_max_segments_show, }; |
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static struct queue_sysfs_entry queue_max_integrity_segments_entry = { .attr = {.name = "max_integrity_segments", .mode = S_IRUGO }, .show = queue_max_integrity_segments_show, }; |
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static struct queue_sysfs_entry queue_max_segment_size_entry = { .attr = {.name = "max_segment_size", .mode = S_IRUGO }, .show = queue_max_segment_size_show, }; |
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static struct queue_sysfs_entry queue_iosched_entry = { .attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR }, .show = elv_iosched_show, .store = elv_iosched_store, }; |
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static struct queue_sysfs_entry queue_hw_sector_size_entry = { .attr = {.name = "hw_sector_size", .mode = S_IRUGO }, |
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.show = queue_logical_block_size_show, }; static struct queue_sysfs_entry queue_logical_block_size_entry = { .attr = {.name = "logical_block_size", .mode = S_IRUGO }, .show = queue_logical_block_size_show, |
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}; |
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static struct queue_sysfs_entry queue_physical_block_size_entry = { .attr = {.name = "physical_block_size", .mode = S_IRUGO }, .show = queue_physical_block_size_show, }; static struct queue_sysfs_entry queue_io_min_entry = { .attr = {.name = "minimum_io_size", .mode = S_IRUGO }, .show = queue_io_min_show, }; static struct queue_sysfs_entry queue_io_opt_entry = { .attr = {.name = "optimal_io_size", .mode = S_IRUGO }, .show = queue_io_opt_show, |
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}; |
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static struct queue_sysfs_entry queue_discard_granularity_entry = { .attr = {.name = "discard_granularity", .mode = S_IRUGO }, .show = queue_discard_granularity_show, }; |
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static struct queue_sysfs_entry queue_discard_max_hw_entry = { .attr = {.name = "discard_max_hw_bytes", .mode = S_IRUGO }, .show = queue_discard_max_hw_show, }; |
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static struct queue_sysfs_entry queue_discard_max_entry = { |
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.attr = {.name = "discard_max_bytes", .mode = S_IRUGO | S_IWUSR }, |
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.show = queue_discard_max_show, |
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.store = queue_discard_max_store, |
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}; |
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static struct queue_sysfs_entry queue_discard_zeroes_data_entry = { .attr = {.name = "discard_zeroes_data", .mode = S_IRUGO }, .show = queue_discard_zeroes_data_show, }; |
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static struct queue_sysfs_entry queue_write_same_max_entry = { .attr = {.name = "write_same_max_bytes", .mode = S_IRUGO }, .show = queue_write_same_max_show, }; |
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static struct queue_sysfs_entry queue_nonrot_entry = { .attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR }, |
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.show = queue_show_nonrot, .store = queue_store_nonrot, |
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}; |
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static struct queue_sysfs_entry queue_nomerges_entry = { .attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR }, .show = queue_nomerges_show, .store = queue_nomerges_store, }; |
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static struct queue_sysfs_entry queue_rq_affinity_entry = { .attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR }, .show = queue_rq_affinity_show, .store = queue_rq_affinity_store, }; |
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static struct queue_sysfs_entry queue_iostats_entry = { .attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR }, |
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.show = queue_show_iostats, .store = queue_store_iostats, |
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}; |
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static struct queue_sysfs_entry queue_random_entry = { .attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR }, |
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.show = queue_show_random, .store = queue_store_random, |
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}; |
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static struct queue_sysfs_entry queue_poll_entry = { .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR }, .show = queue_poll_show, .store = queue_poll_store, }; |
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static struct queue_sysfs_entry queue_wc_entry = { .attr = {.name = "write_cache", .mode = S_IRUGO | S_IWUSR }, .show = queue_wc_show, .store = queue_wc_store, }; |
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static struct queue_sysfs_entry queue_dax_entry = { .attr = {.name = "dax", .mode = S_IRUGO }, .show = queue_dax_show, }; |
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static struct attribute *default_attrs[] = { &queue_requests_entry.attr, &queue_ra_entry.attr, &queue_max_hw_sectors_entry.attr, &queue_max_sectors_entry.attr, |
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&queue_max_segments_entry.attr, |
13f05c8d8 block/scsi: Provi... |
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&queue_max_integrity_segments_entry.attr, |
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&queue_max_segment_size_entry.attr, |
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&queue_iosched_entry.attr, |
e68b903c6 Expose hardware s... |
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&queue_hw_sector_size_entry.attr, |
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&queue_logical_block_size_entry.attr, |
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&queue_physical_block_size_entry.attr, &queue_io_min_entry.attr, &queue_io_opt_entry.attr, |
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&queue_discard_granularity_entry.attr, &queue_discard_max_entry.attr, |
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&queue_discard_max_hw_entry.attr, |
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&queue_discard_zeroes_data_entry.attr, |
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&queue_write_same_max_entry.attr, |
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&queue_nonrot_entry.attr, |
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&queue_nomerges_entry.attr, |
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&queue_rq_affinity_entry.attr, |
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&queue_iostats_entry.attr, |
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&queue_random_entry.attr, |
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&queue_poll_entry.attr, |
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&queue_wc_entry.attr, |
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&queue_dax_entry.attr, |
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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); |
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if (blk_queue_dying(q)) { |
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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); |
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struct request_queue *q; |
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ssize_t res; if (!entry->store) return -EIO; |
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q = container_of(kobj, struct request_queue, kobj); |
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mutex_lock(&q->sysfs_lock); |
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if (blk_queue_dying(q)) { |
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mutex_unlock(&q->sysfs_lock); return -ENOENT; } res = entry->store(q, page, length); mutex_unlock(&q->sysfs_lock); return res; } |
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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); } |
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/** |
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* blk_release_queue: - release a &struct request_queue when it is no longer needed * @kobj: the kobj belonging to the request queue to be released |
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* * Description: |
499337bb6 block/blk-sysfs.c... |
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* blk_release_queue is the pair to blk_init_queue() or |
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* blk_queue_make_request(). It should be called when a request queue is * being released; typically when a block device is being de-registered. * Currently, its primary task it to free all the &struct request * structures that were allocated to the queue and the queue itself. * |
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* Note: * The low level driver must have finished any outstanding requests first * via blk_cleanup_queue(). |
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**/ static void blk_release_queue(struct kobject *kobj) { struct request_queue *q = container_of(kobj, struct request_queue, kobj); |
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|
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bdi_exit(&q->backing_dev_info); |
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blkcg_exit_queue(q); |
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if (q->elevator) { spin_lock_irq(q->queue_lock); ioc_clear_queue(q); spin_unlock_irq(q->queue_lock); |
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elevator_exit(q->elevator); |
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} |
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|
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blk_exit_rl(&q->root_rl); |
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if (q->queue_tags) __blk_queue_free_tags(q); |
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if (!q->mq_ops) |
f70ced091 blk-mq: support p... |
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blk_free_flush_queue(q->fq); |
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else blk_mq_release(q); |
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|
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blk_trace_shutdown(q); |
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if (q->bio_split) bioset_free(q->bio_split); |
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ida_simple_remove(&blk_queue_ida, q->id); |
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call_rcu(&q->rcu_head, blk_free_queue_rcu); |
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} |
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static const struct sysfs_ops queue_sysfs_ops = { |
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.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, }; int blk_register_queue(struct gendisk *disk) { int ret; |
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struct device *dev = disk_to_dev(disk); |
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struct request_queue *q = disk->queue; |
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if (WARN_ON(!q)) |
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return -ENXIO; |
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/* |
17497acbd blk-mq, percpu_re... |
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* 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. |
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*/ |
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if (!blk_queue_init_done(q)) { queue_flag_set_unlocked(QUEUE_FLAG_INIT_DONE, q); |
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percpu_ref_switch_to_percpu(&q->q_usage_counter); |
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blk_queue_bypass_end(q); } |
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|
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ret = blk_trace_init_sysfs(dev); if (ret) return ret; |
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ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue"); |
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if (ret < 0) { blk_trace_remove_sysfs(dev); |
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return ret; |
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} |
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kobject_uevent(&q->kobj, KOBJ_ADD); |
320ae51fe blk-mq: new multi... |
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if (q->mq_ops) |
b21d5b301 blk-mq: register ... |
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blk_mq_register_dev(dev, q); |
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|
cd43e26f0 block: Expose sta... |
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if (!q->request_fn) return 0; |
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ret = elv_register_queue(q); if (ret) { kobject_uevent(&q->kobj, KOBJ_REMOVE); kobject_del(&q->kobj); |
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blk_trace_remove_sysfs(dev); |
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kobject_put(&dev->kobj); |
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return ret; } return 0; } void blk_unregister_queue(struct gendisk *disk) { struct request_queue *q = disk->queue; |
fb1997463 block: fix blk_re... |
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if (WARN_ON(!q)) return; |
320ae51fe blk-mq: new multi... |
671 |
if (q->mq_ops) |
b21d5b301 blk-mq: register ... |
672 |
blk_mq_unregister_dev(disk_to_dev(disk), q); |
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|
48c0d4d4c Add missing blk_t... |
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if (q->request_fn) |
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elv_unregister_queue(q); |
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kobject_uevent(&q->kobj, KOBJ_REMOVE); kobject_del(&q->kobj); blk_trace_remove_sysfs(disk_to_dev(disk)); kobject_put(&disk_to_dev(disk)->kobj); |
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} |