mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:56:48 +07:00
c87ffbb812
kernel needs to kobject_put on dev->kobj if elv_register_queue fails. Signed-off-by: Xiaotian Feng <dfeng@redhat.com> Cc: "Martin K. Petersen" <martin.petersen@oracle.com> Cc: Stephen Hemminger <shemminger@vyatta.com> Cc: Nikanth Karthikesan <knikanth@suse.de> Cc: David Teigland <teigland@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
536 lines
14 KiB
C
536 lines
14 KiB
C
/*
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* Functions related to sysfs handling
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/blktrace_api.h>
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#include "blk.h"
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struct queue_sysfs_entry {
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struct attribute attr;
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ssize_t (*show)(struct request_queue *, char *);
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ssize_t (*store)(struct request_queue *, const char *, size_t);
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};
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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\n", var);
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}
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static ssize_t
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queue_var_store(unsigned long *var, const char *page, size_t count)
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{
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char *p = (char *) page;
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*var = simple_strtoul(p, &p, 10);
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return count;
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}
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static ssize_t queue_requests_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->nr_requests, (page));
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}
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static ssize_t
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queue_requests_store(struct request_queue *q, const char *page, size_t count)
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{
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struct request_list *rl = &q->rq;
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unsigned long nr;
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int ret;
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if (!q->request_fn)
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return -EINVAL;
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ret = queue_var_store(&nr, page, count);
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if (nr < BLKDEV_MIN_RQ)
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nr = BLKDEV_MIN_RQ;
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spin_lock_irq(q->queue_lock);
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q->nr_requests = nr;
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blk_queue_congestion_threshold(q);
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if (rl->count[BLK_RW_SYNC] >= queue_congestion_on_threshold(q))
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blk_set_queue_congested(q, BLK_RW_SYNC);
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else if (rl->count[BLK_RW_SYNC] < queue_congestion_off_threshold(q))
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blk_clear_queue_congested(q, BLK_RW_SYNC);
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if (rl->count[BLK_RW_ASYNC] >= queue_congestion_on_threshold(q))
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blk_set_queue_congested(q, BLK_RW_ASYNC);
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else if (rl->count[BLK_RW_ASYNC] < queue_congestion_off_threshold(q))
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blk_clear_queue_congested(q, BLK_RW_ASYNC);
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if (rl->count[BLK_RW_SYNC] >= q->nr_requests) {
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blk_set_queue_full(q, BLK_RW_SYNC);
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} else if (rl->count[BLK_RW_SYNC]+1 <= q->nr_requests) {
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blk_clear_queue_full(q, BLK_RW_SYNC);
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wake_up(&rl->wait[BLK_RW_SYNC]);
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}
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if (rl->count[BLK_RW_ASYNC] >= q->nr_requests) {
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blk_set_queue_full(q, BLK_RW_ASYNC);
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} else if (rl->count[BLK_RW_ASYNC]+1 <= q->nr_requests) {
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blk_clear_queue_full(q, BLK_RW_ASYNC);
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wake_up(&rl->wait[BLK_RW_ASYNC]);
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}
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spin_unlock_irq(q->queue_lock);
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return ret;
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}
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static ssize_t queue_ra_show(struct request_queue *q, char *page)
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{
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unsigned long ra_kb = q->backing_dev_info.ra_pages <<
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(PAGE_CACHE_SHIFT - 10);
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return queue_var_show(ra_kb, (page));
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}
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static ssize_t
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queue_ra_store(struct request_queue *q, const char *page, size_t count)
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{
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unsigned long ra_kb;
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ssize_t ret = queue_var_store(&ra_kb, page, count);
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q->backing_dev_info.ra_pages = ra_kb >> (PAGE_CACHE_SHIFT - 10);
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return ret;
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}
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static ssize_t queue_max_sectors_show(struct request_queue *q, char *page)
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{
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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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}
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static ssize_t queue_max_segments_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_max_segments(q), (page));
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}
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static ssize_t queue_max_segment_size_show(struct request_queue *q, char *page)
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{
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if (test_bit(QUEUE_FLAG_CLUSTER, &q->queue_flags))
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return queue_var_show(queue_max_segment_size(q), (page));
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return queue_var_show(PAGE_CACHE_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)
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{
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return queue_var_show(queue_physical_block_size(q), page);
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}
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static ssize_t queue_io_min_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_io_min(q), page);
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}
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static ssize_t queue_io_opt_show(struct request_queue *q, char *page)
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{
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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)
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{
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return queue_var_show(q->limits.discard_granularity, page);
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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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{
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return queue_var_show(q->limits.max_discard_sectors << 9, page);
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}
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static ssize_t queue_discard_zeroes_data_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_discard_zeroes_data(q), page);
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}
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static ssize_t
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queue_max_sectors_store(struct request_queue *q, const char *page, size_t count)
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{
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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_CACHE_SHIFT - 10);
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ssize_t ret = queue_var_store(&max_sectors_kb, page, count);
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if (max_sectors_kb > max_hw_sectors_kb || max_sectors_kb < page_kb)
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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);
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return ret;
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}
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static ssize_t queue_max_hw_sectors_show(struct request_queue *q, char *page)
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{
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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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}
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#define QUEUE_SYSFS_BIT_FNS(name, flag, neg) \
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static ssize_t \
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queue_show_##name(struct request_queue *q, char *page) \
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{ \
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int bit; \
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bit = test_bit(QUEUE_FLAG_##flag, &q->queue_flags); \
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return queue_var_show(neg ? !bit : bit, page); \
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} \
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static ssize_t \
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queue_store_##name(struct request_queue *q, const char *page, size_t count) \
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{ \
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unsigned long val; \
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ssize_t ret; \
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ret = queue_var_store(&val, page, count); \
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if (neg) \
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val = !val; \
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\
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spin_lock_irq(q->queue_lock); \
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if (val) \
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queue_flag_set(QUEUE_FLAG_##flag, q); \
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else \
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queue_flag_clear(QUEUE_FLAG_##flag, q); \
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spin_unlock_irq(q->queue_lock); \
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return ret; \
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}
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QUEUE_SYSFS_BIT_FNS(nonrot, NONROT, 1);
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QUEUE_SYSFS_BIT_FNS(random, ADD_RANDOM, 0);
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QUEUE_SYSFS_BIT_FNS(iostats, IO_STAT, 0);
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#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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{
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return queue_var_show((blk_queue_nomerges(q) << 1) |
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blk_queue_noxmerges(q), page);
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}
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static ssize_t queue_nomerges_store(struct request_queue *q, const char *page,
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size_t count)
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{
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unsigned long nm;
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ssize_t ret = queue_var_store(&nm, page, count);
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spin_lock_irq(q->queue_lock);
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queue_flag_clear(QUEUE_FLAG_NOMERGES, q);
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queue_flag_clear(QUEUE_FLAG_NOXMERGES, q);
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if (nm == 2)
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queue_flag_set(QUEUE_FLAG_NOMERGES, q);
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else if (nm)
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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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}
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static ssize_t queue_rq_affinity_show(struct request_queue *q, char *page)
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{
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bool set = test_bit(QUEUE_FLAG_SAME_COMP, &q->queue_flags);
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return queue_var_show(set, page);
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}
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static ssize_t
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queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
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{
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ssize_t ret = -EINVAL;
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#if defined(CONFIG_USE_GENERIC_SMP_HELPERS)
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unsigned long val;
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ret = queue_var_store(&val, page, count);
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spin_lock_irq(q->queue_lock);
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if (val)
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queue_flag_set(QUEUE_FLAG_SAME_COMP, q);
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else
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queue_flag_clear(QUEUE_FLAG_SAME_COMP, q);
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spin_unlock_irq(q->queue_lock);
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#endif
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return ret;
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}
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static struct queue_sysfs_entry queue_requests_entry = {
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.attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR },
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.show = queue_requests_show,
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.store = queue_requests_store,
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};
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static struct queue_sysfs_entry queue_ra_entry = {
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.attr = {.name = "read_ahead_kb", .mode = S_IRUGO | S_IWUSR },
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.show = queue_ra_show,
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.store = queue_ra_store,
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};
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static struct queue_sysfs_entry queue_max_sectors_entry = {
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.attr = {.name = "max_sectors_kb", .mode = S_IRUGO | S_IWUSR },
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.show = queue_max_sectors_show,
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.store = queue_max_sectors_store,
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};
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static struct queue_sysfs_entry queue_max_hw_sectors_entry = {
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.attr = {.name = "max_hw_sectors_kb", .mode = S_IRUGO },
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.show = queue_max_hw_sectors_show,
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};
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static struct queue_sysfs_entry queue_max_segments_entry = {
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.attr = {.name = "max_segments", .mode = S_IRUGO },
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.show = queue_max_segments_show,
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};
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static struct queue_sysfs_entry queue_max_segment_size_entry = {
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.attr = {.name = "max_segment_size", .mode = S_IRUGO },
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.show = queue_max_segment_size_show,
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};
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static struct queue_sysfs_entry queue_iosched_entry = {
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.attr = {.name = "scheduler", .mode = S_IRUGO | S_IWUSR },
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.show = elv_iosched_show,
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.store = elv_iosched_store,
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};
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static struct queue_sysfs_entry queue_hw_sector_size_entry = {
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.attr = {.name = "hw_sector_size", .mode = S_IRUGO },
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.show = queue_logical_block_size_show,
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};
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static struct queue_sysfs_entry queue_logical_block_size_entry = {
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.attr = {.name = "logical_block_size", .mode = S_IRUGO },
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.show = queue_logical_block_size_show,
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};
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static struct queue_sysfs_entry queue_physical_block_size_entry = {
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.attr = {.name = "physical_block_size", .mode = S_IRUGO },
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.show = queue_physical_block_size_show,
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};
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static struct queue_sysfs_entry queue_io_min_entry = {
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.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
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.show = queue_io_min_show,
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};
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static struct queue_sysfs_entry queue_io_opt_entry = {
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.attr = {.name = "optimal_io_size", .mode = S_IRUGO },
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.show = queue_io_opt_show,
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};
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static struct queue_sysfs_entry queue_discard_granularity_entry = {
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.attr = {.name = "discard_granularity", .mode = S_IRUGO },
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.show = queue_discard_granularity_show,
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};
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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 },
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.show = queue_discard_max_show,
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};
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static struct queue_sysfs_entry queue_discard_zeroes_data_entry = {
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.attr = {.name = "discard_zeroes_data", .mode = S_IRUGO },
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.show = queue_discard_zeroes_data_show,
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};
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static struct queue_sysfs_entry queue_nonrot_entry = {
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.attr = {.name = "rotational", .mode = S_IRUGO | S_IWUSR },
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.show = queue_show_nonrot,
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.store = queue_store_nonrot,
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};
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static struct queue_sysfs_entry queue_nomerges_entry = {
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.attr = {.name = "nomerges", .mode = S_IRUGO | S_IWUSR },
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.show = queue_nomerges_show,
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.store = queue_nomerges_store,
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};
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static struct queue_sysfs_entry queue_rq_affinity_entry = {
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.attr = {.name = "rq_affinity", .mode = S_IRUGO | S_IWUSR },
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.show = queue_rq_affinity_show,
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.store = queue_rq_affinity_store,
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};
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static struct queue_sysfs_entry queue_iostats_entry = {
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.attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
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.show = queue_show_iostats,
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.store = queue_store_iostats,
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};
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static struct queue_sysfs_entry queue_random_entry = {
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.attr = {.name = "add_random", .mode = S_IRUGO | S_IWUSR },
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.show = queue_show_random,
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.store = queue_store_random,
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};
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static struct attribute *default_attrs[] = {
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&queue_requests_entry.attr,
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&queue_ra_entry.attr,
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&queue_max_hw_sectors_entry.attr,
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&queue_max_sectors_entry.attr,
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&queue_max_segments_entry.attr,
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&queue_max_segment_size_entry.attr,
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&queue_iosched_entry.attr,
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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,
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&queue_io_min_entry.attr,
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&queue_io_opt_entry.attr,
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&queue_discard_granularity_entry.attr,
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&queue_discard_max_entry.attr,
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&queue_discard_zeroes_data_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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NULL,
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};
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#define to_queue(atr) container_of((atr), struct queue_sysfs_entry, attr)
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static ssize_t
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queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
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{
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struct queue_sysfs_entry *entry = to_queue(attr);
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struct request_queue *q =
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container_of(kobj, struct request_queue, kobj);
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ssize_t res;
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if (!entry->show)
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return -EIO;
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mutex_lock(&q->sysfs_lock);
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if (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
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mutex_unlock(&q->sysfs_lock);
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return -ENOENT;
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}
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res = entry->show(q, page);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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static ssize_t
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queue_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *page, size_t length)
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{
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struct queue_sysfs_entry *entry = to_queue(attr);
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struct request_queue *q;
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ssize_t res;
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if (!entry->store)
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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 (test_bit(QUEUE_FLAG_DEAD, &q->queue_flags)) {
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mutex_unlock(&q->sysfs_lock);
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return -ENOENT;
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}
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res = entry->store(q, page, length);
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mutex_unlock(&q->sysfs_lock);
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return res;
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}
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/**
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* blk_cleanup_queue: - release a &struct request_queue when it is no longer needed
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* @kobj: the kobj belonging of the request queue to be released
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*
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* Description:
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* blk_cleanup_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
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* being released; typically when a block device is being de-registered.
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* Currently, its primary task it to free all the &struct request
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* structures that were allocated to the queue and the queue itself.
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*
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* Caveat:
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* Hopefully the low level driver will have finished any
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* outstanding requests first...
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**/
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static void blk_release_queue(struct kobject *kobj)
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{
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struct request_queue *q =
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container_of(kobj, struct request_queue, kobj);
|
|
struct request_list *rl = &q->rq;
|
|
|
|
blk_sync_queue(q);
|
|
|
|
if (rl->rq_pool)
|
|
mempool_destroy(rl->rq_pool);
|
|
|
|
if (q->queue_tags)
|
|
__blk_queue_free_tags(q);
|
|
|
|
blk_trace_shutdown(q);
|
|
|
|
bdi_destroy(&q->backing_dev_info);
|
|
kmem_cache_free(blk_requestq_cachep, q);
|
|
}
|
|
|
|
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,
|
|
};
|
|
|
|
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;
|
|
|
|
ret = blk_trace_init_sysfs(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = kobject_add(&q->kobj, kobject_get(&dev->kobj), "%s", "queue");
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
kobject_uevent(&q->kobj, KOBJ_ADD);
|
|
|
|
if (!q->request_fn)
|
|
return 0;
|
|
|
|
ret = elv_register_queue(q);
|
|
if (ret) {
|
|
kobject_uevent(&q->kobj, KOBJ_REMOVE);
|
|
kobject_del(&q->kobj);
|
|
blk_trace_remove_sysfs(disk_to_dev(disk));
|
|
kobject_put(&dev->kobj);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void blk_unregister_queue(struct gendisk *disk)
|
|
{
|
|
struct request_queue *q = disk->queue;
|
|
|
|
if (WARN_ON(!q))
|
|
return;
|
|
|
|
if (q->request_fn)
|
|
elv_unregister_queue(q);
|
|
|
|
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);
|
|
}
|