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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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458aa1a099
Discarding less than a physical block doesn't make sense. This fixes
the existing behavior for zram before the recent changes to default
the discard granularity to the logical block size, and is also a
generally useful sanity check.
Fixes: 3753039def
("zram: use the default discard granularity")
Reported-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20240103081622.508754-1-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
929 lines
29 KiB
C
929 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Functions related to setting various queue properties from drivers
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/pagemap.h>
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#include <linux/backing-dev-defs.h>
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#include <linux/gcd.h>
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#include <linux/lcm.h>
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#include <linux/jiffies.h>
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#include <linux/gfp.h>
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#include <linux/dma-mapping.h>
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#include "blk.h"
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#include "blk-rq-qos.h"
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#include "blk-wbt.h"
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void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout)
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{
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q->rq_timeout = timeout;
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}
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EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);
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/**
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* blk_set_default_limits - reset limits to default values
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* @lim: the queue_limits structure to reset
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*
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* Description:
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* Returns a queue_limit struct to its default state.
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*/
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void blk_set_default_limits(struct queue_limits *lim)
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{
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lim->max_segments = BLK_MAX_SEGMENTS;
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lim->max_discard_segments = 1;
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lim->max_integrity_segments = 0;
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lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;
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lim->virt_boundary_mask = 0;
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lim->max_segment_size = BLK_MAX_SEGMENT_SIZE;
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lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS;
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lim->max_user_sectors = lim->max_dev_sectors = 0;
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lim->chunk_sectors = 0;
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lim->max_write_zeroes_sectors = 0;
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lim->max_zone_append_sectors = 0;
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lim->max_discard_sectors = 0;
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lim->max_hw_discard_sectors = 0;
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lim->max_secure_erase_sectors = 0;
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lim->discard_granularity = 512;
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lim->discard_alignment = 0;
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lim->discard_misaligned = 0;
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lim->logical_block_size = lim->physical_block_size = lim->io_min = 512;
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lim->bounce = BLK_BOUNCE_NONE;
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lim->alignment_offset = 0;
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lim->io_opt = 0;
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lim->misaligned = 0;
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lim->zoned = false;
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lim->zone_write_granularity = 0;
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lim->dma_alignment = 511;
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}
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/**
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* blk_set_stacking_limits - set default limits for stacking devices
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* @lim: the queue_limits structure to reset
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*
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* Description:
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* Returns a queue_limit struct to its default state. Should be used
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* by stacking drivers like DM that have no internal limits.
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*/
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void blk_set_stacking_limits(struct queue_limits *lim)
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{
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blk_set_default_limits(lim);
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/* Inherit limits from component devices */
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lim->max_segments = USHRT_MAX;
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lim->max_discard_segments = USHRT_MAX;
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lim->max_hw_sectors = UINT_MAX;
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lim->max_segment_size = UINT_MAX;
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lim->max_sectors = UINT_MAX;
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lim->max_dev_sectors = UINT_MAX;
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lim->max_write_zeroes_sectors = UINT_MAX;
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lim->max_zone_append_sectors = UINT_MAX;
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}
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EXPORT_SYMBOL(blk_set_stacking_limits);
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/**
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* blk_queue_bounce_limit - set bounce buffer limit for queue
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* @q: the request queue for the device
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* @bounce: bounce limit to enforce
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*
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* Description:
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* Force bouncing for ISA DMA ranges or highmem.
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*
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* DEPRECATED, don't use in new code.
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**/
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void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce)
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{
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q->limits.bounce = bounce;
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}
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EXPORT_SYMBOL(blk_queue_bounce_limit);
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/**
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* blk_queue_max_hw_sectors - set max sectors for a request for this queue
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* @q: the request queue for the device
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* @max_hw_sectors: max hardware sectors in the usual 512b unit
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*
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* Description:
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* Enables a low level driver to set a hard upper limit,
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* max_hw_sectors, on the size of requests. max_hw_sectors is set by
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* the device driver based upon the capabilities of the I/O
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* controller.
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*
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* max_dev_sectors is a hard limit imposed by the storage device for
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* READ/WRITE requests. It is set by the disk driver.
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*
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* max_sectors is a soft limit imposed by the block layer for
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* filesystem type requests. This value can be overridden on a
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* per-device basis in /sys/block/<device>/queue/max_sectors_kb.
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* The soft limit can not exceed max_hw_sectors.
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**/
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void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors)
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{
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struct queue_limits *limits = &q->limits;
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unsigned int max_sectors;
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if ((max_hw_sectors << 9) < PAGE_SIZE) {
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max_hw_sectors = 1 << (PAGE_SHIFT - 9);
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pr_info("%s: set to minimum %u\n", __func__, max_hw_sectors);
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}
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max_hw_sectors = round_down(max_hw_sectors,
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limits->logical_block_size >> SECTOR_SHIFT);
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limits->max_hw_sectors = max_hw_sectors;
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max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors);
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if (limits->max_user_sectors)
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max_sectors = min(max_sectors, limits->max_user_sectors);
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else
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max_sectors = min(max_sectors, BLK_DEF_MAX_SECTORS_CAP);
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max_sectors = round_down(max_sectors,
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limits->logical_block_size >> SECTOR_SHIFT);
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limits->max_sectors = max_sectors;
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if (!q->disk)
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return;
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q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9);
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}
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EXPORT_SYMBOL(blk_queue_max_hw_sectors);
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/**
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* blk_queue_chunk_sectors - set size of the chunk for this queue
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* @q: the request queue for the device
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* @chunk_sectors: chunk sectors in the usual 512b unit
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*
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* Description:
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* If a driver doesn't want IOs to cross a given chunk size, it can set
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* this limit and prevent merging across chunks. Note that the block layer
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* must accept a page worth of data at any offset. So if the crossing of
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* chunks is a hard limitation in the driver, it must still be prepared
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* to split single page bios.
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**/
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void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors)
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{
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q->limits.chunk_sectors = chunk_sectors;
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}
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EXPORT_SYMBOL(blk_queue_chunk_sectors);
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/**
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* blk_queue_max_discard_sectors - set max sectors for a single discard
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* @q: the request queue for the device
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* @max_discard_sectors: maximum number of sectors to discard
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**/
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void blk_queue_max_discard_sectors(struct request_queue *q,
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unsigned int max_discard_sectors)
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{
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q->limits.max_hw_discard_sectors = max_discard_sectors;
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q->limits.max_discard_sectors = max_discard_sectors;
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}
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EXPORT_SYMBOL(blk_queue_max_discard_sectors);
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/**
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* blk_queue_max_secure_erase_sectors - set max sectors for a secure erase
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* @q: the request queue for the device
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* @max_sectors: maximum number of sectors to secure_erase
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**/
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void blk_queue_max_secure_erase_sectors(struct request_queue *q,
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unsigned int max_sectors)
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{
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q->limits.max_secure_erase_sectors = max_sectors;
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}
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EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors);
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/**
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* blk_queue_max_write_zeroes_sectors - set max sectors for a single
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* write zeroes
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* @q: the request queue for the device
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* @max_write_zeroes_sectors: maximum number of sectors to write per command
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**/
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void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
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unsigned int max_write_zeroes_sectors)
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{
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q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors;
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}
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EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors);
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/**
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* blk_queue_max_zone_append_sectors - set max sectors for a single zone append
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* @q: the request queue for the device
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* @max_zone_append_sectors: maximum number of sectors to write per command
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**/
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void blk_queue_max_zone_append_sectors(struct request_queue *q,
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unsigned int max_zone_append_sectors)
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{
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unsigned int max_sectors;
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if (WARN_ON(!blk_queue_is_zoned(q)))
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return;
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max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors);
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max_sectors = min(q->limits.chunk_sectors, max_sectors);
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/*
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* Signal eventual driver bugs resulting in the max_zone_append sectors limit
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* being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set,
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* or the max_hw_sectors limit not set.
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*/
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WARN_ON(!max_sectors);
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q->limits.max_zone_append_sectors = max_sectors;
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}
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EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors);
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/**
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* blk_queue_max_segments - set max hw segments for a request for this queue
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* @q: the request queue for the device
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* @max_segments: max number of segments
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*
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* Description:
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* Enables a low level driver to set an upper limit on the number of
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* hw data segments in a request.
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**/
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void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments)
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{
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if (!max_segments) {
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max_segments = 1;
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pr_info("%s: set to minimum %u\n", __func__, max_segments);
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}
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q->limits.max_segments = max_segments;
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}
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EXPORT_SYMBOL(blk_queue_max_segments);
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/**
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* blk_queue_max_discard_segments - set max segments for discard requests
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* @q: the request queue for the device
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* @max_segments: max number of segments
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*
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* Description:
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* Enables a low level driver to set an upper limit on the number of
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* segments in a discard request.
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**/
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void blk_queue_max_discard_segments(struct request_queue *q,
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unsigned short max_segments)
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{
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q->limits.max_discard_segments = max_segments;
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}
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EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments);
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/**
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* blk_queue_max_segment_size - set max segment size for blk_rq_map_sg
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* @q: the request queue for the device
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* @max_size: max size of segment in bytes
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*
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* Description:
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* Enables a low level driver to set an upper limit on the size of a
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* coalesced segment
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**/
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void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size)
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{
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if (max_size < PAGE_SIZE) {
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max_size = PAGE_SIZE;
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pr_info("%s: set to minimum %u\n", __func__, max_size);
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}
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/* see blk_queue_virt_boundary() for the explanation */
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WARN_ON_ONCE(q->limits.virt_boundary_mask);
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q->limits.max_segment_size = max_size;
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}
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EXPORT_SYMBOL(blk_queue_max_segment_size);
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/**
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* blk_queue_logical_block_size - set logical block size for the queue
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* @q: the request queue for the device
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* @size: the logical block size, in bytes
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*
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* Description:
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* This should be set to the lowest possible block size that the
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* storage device can address. The default of 512 covers most
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* hardware.
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**/
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void blk_queue_logical_block_size(struct request_queue *q, unsigned int size)
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{
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struct queue_limits *limits = &q->limits;
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limits->logical_block_size = size;
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if (limits->discard_granularity < limits->logical_block_size)
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limits->discard_granularity = limits->logical_block_size;
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if (limits->physical_block_size < size)
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limits->physical_block_size = size;
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if (limits->io_min < limits->physical_block_size)
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limits->io_min = limits->physical_block_size;
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limits->max_hw_sectors =
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round_down(limits->max_hw_sectors, size >> SECTOR_SHIFT);
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limits->max_sectors =
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round_down(limits->max_sectors, size >> SECTOR_SHIFT);
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}
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EXPORT_SYMBOL(blk_queue_logical_block_size);
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/**
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* blk_queue_physical_block_size - set physical block size for the queue
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* @q: the request queue for the device
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* @size: the physical block size, in bytes
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*
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* Description:
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* This should be set to the lowest possible sector size that the
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* hardware can operate on without reverting to read-modify-write
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* operations.
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*/
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void blk_queue_physical_block_size(struct request_queue *q, unsigned int size)
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{
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q->limits.physical_block_size = size;
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if (q->limits.physical_block_size < q->limits.logical_block_size)
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q->limits.physical_block_size = q->limits.logical_block_size;
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if (q->limits.discard_granularity < q->limits.physical_block_size)
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q->limits.discard_granularity = q->limits.physical_block_size;
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if (q->limits.io_min < q->limits.physical_block_size)
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q->limits.io_min = q->limits.physical_block_size;
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}
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EXPORT_SYMBOL(blk_queue_physical_block_size);
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/**
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* blk_queue_zone_write_granularity - set zone write granularity for the queue
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* @q: the request queue for the zoned device
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* @size: the zone write granularity size, in bytes
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*
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* Description:
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* This should be set to the lowest possible size allowing to write in
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* sequential zones of a zoned block device.
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*/
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void blk_queue_zone_write_granularity(struct request_queue *q,
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unsigned int size)
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{
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if (WARN_ON_ONCE(!blk_queue_is_zoned(q)))
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return;
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q->limits.zone_write_granularity = size;
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if (q->limits.zone_write_granularity < q->limits.logical_block_size)
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q->limits.zone_write_granularity = q->limits.logical_block_size;
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}
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EXPORT_SYMBOL_GPL(blk_queue_zone_write_granularity);
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/**
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* blk_queue_alignment_offset - set physical block alignment offset
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* @q: the request queue for the device
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* @offset: alignment offset in bytes
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*
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* Description:
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* Some devices are naturally misaligned to compensate for things like
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* the legacy DOS partition table 63-sector offset. Low-level drivers
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* should call this function for devices whose first sector is not
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* naturally aligned.
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*/
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void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset)
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{
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q->limits.alignment_offset =
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offset & (q->limits.physical_block_size - 1);
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q->limits.misaligned = 0;
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}
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EXPORT_SYMBOL(blk_queue_alignment_offset);
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void disk_update_readahead(struct gendisk *disk)
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{
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struct request_queue *q = disk->queue;
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/*
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* For read-ahead of large files to be effective, we need to read ahead
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* at least twice the optimal I/O size.
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*/
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disk->bdi->ra_pages =
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max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES);
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disk->bdi->io_pages = queue_max_sectors(q) >> (PAGE_SHIFT - 9);
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}
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EXPORT_SYMBOL_GPL(disk_update_readahead);
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/**
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* blk_limits_io_min - set minimum request size for a device
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* @limits: the queue limits
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* @min: smallest I/O size in bytes
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*
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* Description:
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* Some devices have an internal block size bigger than the reported
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* hardware sector size. This function can be used to signal the
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* smallest I/O the device can perform without incurring a performance
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* penalty.
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*/
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void blk_limits_io_min(struct queue_limits *limits, unsigned int min)
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{
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limits->io_min = min;
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if (limits->io_min < limits->logical_block_size)
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limits->io_min = limits->logical_block_size;
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if (limits->io_min < limits->physical_block_size)
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limits->io_min = limits->physical_block_size;
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}
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EXPORT_SYMBOL(blk_limits_io_min);
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/**
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* blk_queue_io_min - set minimum request size for the queue
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* @q: the request queue for the device
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* @min: smallest I/O size in bytes
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*
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* Description:
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* Storage devices may report a granularity or preferred minimum I/O
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* size which is the smallest request the device can perform without
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* incurring a performance penalty. For disk drives this is often the
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* physical block size. For RAID arrays it is often the stripe chunk
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* size. A properly aligned multiple of minimum_io_size is the
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* preferred request size for workloads where a high number of I/O
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* operations is desired.
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*/
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void blk_queue_io_min(struct request_queue *q, unsigned int min)
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{
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blk_limits_io_min(&q->limits, min);
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}
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EXPORT_SYMBOL(blk_queue_io_min);
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/**
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* blk_limits_io_opt - set optimal request size for a device
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* @limits: the queue limits
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* @opt: smallest I/O size in bytes
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*
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* Description:
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* Storage devices may report an optimal I/O size, which is the
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* device's preferred unit for sustained I/O. This is rarely reported
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* for disk drives. For RAID arrays it is usually the stripe width or
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* the internal track size. A properly aligned multiple of
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|
* optimal_io_size is the preferred request size for workloads where
|
|
* sustained throughput is desired.
|
|
*/
|
|
void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt)
|
|
{
|
|
limits->io_opt = opt;
|
|
}
|
|
EXPORT_SYMBOL(blk_limits_io_opt);
|
|
|
|
/**
|
|
* blk_queue_io_opt - set optimal request size for the queue
|
|
* @q: the request queue for the device
|
|
* @opt: optimal request size in bytes
|
|
*
|
|
* Description:
|
|
* Storage devices may report an optimal I/O size, which is the
|
|
* device's preferred unit for sustained I/O. This is rarely reported
|
|
* for disk drives. For RAID arrays it is usually the stripe width or
|
|
* the internal track size. A properly aligned multiple of
|
|
* optimal_io_size is the preferred request size for workloads where
|
|
* sustained throughput is desired.
|
|
*/
|
|
void blk_queue_io_opt(struct request_queue *q, unsigned int opt)
|
|
{
|
|
blk_limits_io_opt(&q->limits, opt);
|
|
if (!q->disk)
|
|
return;
|
|
q->disk->bdi->ra_pages =
|
|
max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES);
|
|
}
|
|
EXPORT_SYMBOL(blk_queue_io_opt);
|
|
|
|
static int queue_limit_alignment_offset(const struct queue_limits *lim,
|
|
sector_t sector)
|
|
{
|
|
unsigned int granularity = max(lim->physical_block_size, lim->io_min);
|
|
unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
|
|
<< SECTOR_SHIFT;
|
|
|
|
return (granularity + lim->alignment_offset - alignment) % granularity;
|
|
}
|
|
|
|
static unsigned int queue_limit_discard_alignment(
|
|
const struct queue_limits *lim, sector_t sector)
|
|
{
|
|
unsigned int alignment, granularity, offset;
|
|
|
|
if (!lim->max_discard_sectors)
|
|
return 0;
|
|
|
|
/* Why are these in bytes, not sectors? */
|
|
alignment = lim->discard_alignment >> SECTOR_SHIFT;
|
|
granularity = lim->discard_granularity >> SECTOR_SHIFT;
|
|
if (!granularity)
|
|
return 0;
|
|
|
|
/* Offset of the partition start in 'granularity' sectors */
|
|
offset = sector_div(sector, granularity);
|
|
|
|
/* And why do we do this modulus *again* in blkdev_issue_discard()? */
|
|
offset = (granularity + alignment - offset) % granularity;
|
|
|
|
/* Turn it back into bytes, gaah */
|
|
return offset << SECTOR_SHIFT;
|
|
}
|
|
|
|
static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs)
|
|
{
|
|
sectors = round_down(sectors, lbs >> SECTOR_SHIFT);
|
|
if (sectors < PAGE_SIZE >> SECTOR_SHIFT)
|
|
sectors = PAGE_SIZE >> SECTOR_SHIFT;
|
|
return sectors;
|
|
}
|
|
|
|
/**
|
|
* blk_stack_limits - adjust queue_limits for stacked devices
|
|
* @t: the stacking driver limits (top device)
|
|
* @b: the underlying queue limits (bottom, component device)
|
|
* @start: first data sector within component device
|
|
*
|
|
* Description:
|
|
* This function is used by stacking drivers like MD and DM to ensure
|
|
* that all component devices have compatible block sizes and
|
|
* alignments. The stacking driver must provide a queue_limits
|
|
* struct (top) and then iteratively call the stacking function for
|
|
* all component (bottom) devices. The stacking function will
|
|
* attempt to combine the values and ensure proper alignment.
|
|
*
|
|
* Returns 0 if the top and bottom queue_limits are compatible. The
|
|
* top device's block sizes and alignment offsets may be adjusted to
|
|
* ensure alignment with the bottom device. If no compatible sizes
|
|
* and alignments exist, -1 is returned and the resulting top
|
|
* queue_limits will have the misaligned flag set to indicate that
|
|
* the alignment_offset is undefined.
|
|
*/
|
|
int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
|
|
sector_t start)
|
|
{
|
|
unsigned int top, bottom, alignment, ret = 0;
|
|
|
|
t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);
|
|
t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors);
|
|
t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors);
|
|
t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors,
|
|
b->max_write_zeroes_sectors);
|
|
t->max_zone_append_sectors = min(t->max_zone_append_sectors,
|
|
b->max_zone_append_sectors);
|
|
t->bounce = max(t->bounce, b->bounce);
|
|
|
|
t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask,
|
|
b->seg_boundary_mask);
|
|
t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask,
|
|
b->virt_boundary_mask);
|
|
|
|
t->max_segments = min_not_zero(t->max_segments, b->max_segments);
|
|
t->max_discard_segments = min_not_zero(t->max_discard_segments,
|
|
b->max_discard_segments);
|
|
t->max_integrity_segments = min_not_zero(t->max_integrity_segments,
|
|
b->max_integrity_segments);
|
|
|
|
t->max_segment_size = min_not_zero(t->max_segment_size,
|
|
b->max_segment_size);
|
|
|
|
t->misaligned |= b->misaligned;
|
|
|
|
alignment = queue_limit_alignment_offset(b, start);
|
|
|
|
/* Bottom device has different alignment. Check that it is
|
|
* compatible with the current top alignment.
|
|
*/
|
|
if (t->alignment_offset != alignment) {
|
|
|
|
top = max(t->physical_block_size, t->io_min)
|
|
+ t->alignment_offset;
|
|
bottom = max(b->physical_block_size, b->io_min) + alignment;
|
|
|
|
/* Verify that top and bottom intervals line up */
|
|
if (max(top, bottom) % min(top, bottom)) {
|
|
t->misaligned = 1;
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
t->logical_block_size = max(t->logical_block_size,
|
|
b->logical_block_size);
|
|
|
|
t->physical_block_size = max(t->physical_block_size,
|
|
b->physical_block_size);
|
|
|
|
t->io_min = max(t->io_min, b->io_min);
|
|
t->io_opt = lcm_not_zero(t->io_opt, b->io_opt);
|
|
t->dma_alignment = max(t->dma_alignment, b->dma_alignment);
|
|
|
|
/* Set non-power-of-2 compatible chunk_sectors boundary */
|
|
if (b->chunk_sectors)
|
|
t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors);
|
|
|
|
/* Physical block size a multiple of the logical block size? */
|
|
if (t->physical_block_size & (t->logical_block_size - 1)) {
|
|
t->physical_block_size = t->logical_block_size;
|
|
t->misaligned = 1;
|
|
ret = -1;
|
|
}
|
|
|
|
/* Minimum I/O a multiple of the physical block size? */
|
|
if (t->io_min & (t->physical_block_size - 1)) {
|
|
t->io_min = t->physical_block_size;
|
|
t->misaligned = 1;
|
|
ret = -1;
|
|
}
|
|
|
|
/* Optimal I/O a multiple of the physical block size? */
|
|
if (t->io_opt & (t->physical_block_size - 1)) {
|
|
t->io_opt = 0;
|
|
t->misaligned = 1;
|
|
ret = -1;
|
|
}
|
|
|
|
/* chunk_sectors a multiple of the physical block size? */
|
|
if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) {
|
|
t->chunk_sectors = 0;
|
|
t->misaligned = 1;
|
|
ret = -1;
|
|
}
|
|
|
|
t->raid_partial_stripes_expensive =
|
|
max(t->raid_partial_stripes_expensive,
|
|
b->raid_partial_stripes_expensive);
|
|
|
|
/* Find lowest common alignment_offset */
|
|
t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment)
|
|
% max(t->physical_block_size, t->io_min);
|
|
|
|
/* Verify that new alignment_offset is on a logical block boundary */
|
|
if (t->alignment_offset & (t->logical_block_size - 1)) {
|
|
t->misaligned = 1;
|
|
ret = -1;
|
|
}
|
|
|
|
t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size);
|
|
t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size);
|
|
t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size);
|
|
|
|
/* Discard alignment and granularity */
|
|
if (b->discard_granularity) {
|
|
alignment = queue_limit_discard_alignment(b, start);
|
|
|
|
if (t->discard_granularity != 0 &&
|
|
t->discard_alignment != alignment) {
|
|
top = t->discard_granularity + t->discard_alignment;
|
|
bottom = b->discard_granularity + alignment;
|
|
|
|
/* Verify that top and bottom intervals line up */
|
|
if ((max(top, bottom) % min(top, bottom)) != 0)
|
|
t->discard_misaligned = 1;
|
|
}
|
|
|
|
t->max_discard_sectors = min_not_zero(t->max_discard_sectors,
|
|
b->max_discard_sectors);
|
|
t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors,
|
|
b->max_hw_discard_sectors);
|
|
t->discard_granularity = max(t->discard_granularity,
|
|
b->discard_granularity);
|
|
t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) %
|
|
t->discard_granularity;
|
|
}
|
|
t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors,
|
|
b->max_secure_erase_sectors);
|
|
t->zone_write_granularity = max(t->zone_write_granularity,
|
|
b->zone_write_granularity);
|
|
t->zoned = max(t->zoned, b->zoned);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(blk_stack_limits);
|
|
|
|
/**
|
|
* disk_stack_limits - adjust queue limits for stacked drivers
|
|
* @disk: MD/DM gendisk (top)
|
|
* @bdev: the underlying block device (bottom)
|
|
* @offset: offset to beginning of data within component device
|
|
*
|
|
* Description:
|
|
* Merges the limits for a top level gendisk and a bottom level
|
|
* block_device.
|
|
*/
|
|
void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
|
|
sector_t offset)
|
|
{
|
|
struct request_queue *t = disk->queue;
|
|
|
|
if (blk_stack_limits(&t->limits, &bdev_get_queue(bdev)->limits,
|
|
get_start_sect(bdev) + (offset >> 9)) < 0)
|
|
pr_notice("%s: Warning: Device %pg is misaligned\n",
|
|
disk->disk_name, bdev);
|
|
|
|
disk_update_readahead(disk);
|
|
}
|
|
EXPORT_SYMBOL(disk_stack_limits);
|
|
|
|
/**
|
|
* blk_queue_update_dma_pad - update pad mask
|
|
* @q: the request queue for the device
|
|
* @mask: pad mask
|
|
*
|
|
* Update dma pad mask.
|
|
*
|
|
* Appending pad buffer to a request modifies the last entry of a
|
|
* scatter list such that it includes the pad buffer.
|
|
**/
|
|
void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask)
|
|
{
|
|
if (mask > q->dma_pad_mask)
|
|
q->dma_pad_mask = mask;
|
|
}
|
|
EXPORT_SYMBOL(blk_queue_update_dma_pad);
|
|
|
|
/**
|
|
* blk_queue_segment_boundary - set boundary rules for segment merging
|
|
* @q: the request queue for the device
|
|
* @mask: the memory boundary mask
|
|
**/
|
|
void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask)
|
|
{
|
|
if (mask < PAGE_SIZE - 1) {
|
|
mask = PAGE_SIZE - 1;
|
|
pr_info("%s: set to minimum %lx\n", __func__, mask);
|
|
}
|
|
|
|
q->limits.seg_boundary_mask = mask;
|
|
}
|
|
EXPORT_SYMBOL(blk_queue_segment_boundary);
|
|
|
|
/**
|
|
* blk_queue_virt_boundary - set boundary rules for bio merging
|
|
* @q: the request queue for the device
|
|
* @mask: the memory boundary mask
|
|
**/
|
|
void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask)
|
|
{
|
|
q->limits.virt_boundary_mask = mask;
|
|
|
|
/*
|
|
* Devices that require a virtual boundary do not support scatter/gather
|
|
* I/O natively, but instead require a descriptor list entry for each
|
|
* page (which might not be idential to the Linux PAGE_SIZE). Because
|
|
* of that they are not limited by our notion of "segment size".
|
|
*/
|
|
if (mask)
|
|
q->limits.max_segment_size = UINT_MAX;
|
|
}
|
|
EXPORT_SYMBOL(blk_queue_virt_boundary);
|
|
|
|
/**
|
|
* blk_queue_dma_alignment - set dma length and memory alignment
|
|
* @q: the request queue for the device
|
|
* @mask: alignment mask
|
|
*
|
|
* description:
|
|
* set required memory and length alignment for direct dma transactions.
|
|
* this is used when building direct io requests for the queue.
|
|
*
|
|
**/
|
|
void blk_queue_dma_alignment(struct request_queue *q, int mask)
|
|
{
|
|
q->limits.dma_alignment = mask;
|
|
}
|
|
EXPORT_SYMBOL(blk_queue_dma_alignment);
|
|
|
|
/**
|
|
* blk_queue_update_dma_alignment - update dma length and memory alignment
|
|
* @q: the request queue for the device
|
|
* @mask: alignment mask
|
|
*
|
|
* description:
|
|
* update required memory and length alignment for direct dma transactions.
|
|
* If the requested alignment is larger than the current alignment, then
|
|
* the current queue alignment is updated to the new value, otherwise it
|
|
* is left alone. The design of this is to allow multiple objects
|
|
* (driver, device, transport etc) to set their respective
|
|
* alignments without having them interfere.
|
|
*
|
|
**/
|
|
void blk_queue_update_dma_alignment(struct request_queue *q, int mask)
|
|
{
|
|
BUG_ON(mask > PAGE_SIZE);
|
|
|
|
if (mask > q->limits.dma_alignment)
|
|
q->limits.dma_alignment = mask;
|
|
}
|
|
EXPORT_SYMBOL(blk_queue_update_dma_alignment);
|
|
|
|
/**
|
|
* blk_set_queue_depth - tell the block layer about the device queue depth
|
|
* @q: the request queue for the device
|
|
* @depth: queue depth
|
|
*
|
|
*/
|
|
void blk_set_queue_depth(struct request_queue *q, unsigned int depth)
|
|
{
|
|
q->queue_depth = depth;
|
|
rq_qos_queue_depth_changed(q);
|
|
}
|
|
EXPORT_SYMBOL(blk_set_queue_depth);
|
|
|
|
/**
|
|
* blk_queue_write_cache - configure queue's write cache
|
|
* @q: the request queue for the device
|
|
* @wc: write back cache on or off
|
|
* @fua: device supports FUA writes, if true
|
|
*
|
|
* Tell the block layer about the write cache of @q.
|
|
*/
|
|
void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua)
|
|
{
|
|
if (wc) {
|
|
blk_queue_flag_set(QUEUE_FLAG_HW_WC, q);
|
|
blk_queue_flag_set(QUEUE_FLAG_WC, q);
|
|
} else {
|
|
blk_queue_flag_clear(QUEUE_FLAG_HW_WC, q);
|
|
blk_queue_flag_clear(QUEUE_FLAG_WC, q);
|
|
}
|
|
if (fua)
|
|
blk_queue_flag_set(QUEUE_FLAG_FUA, q);
|
|
else
|
|
blk_queue_flag_clear(QUEUE_FLAG_FUA, q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_queue_write_cache);
|
|
|
|
/**
|
|
* blk_queue_required_elevator_features - Set a queue required elevator features
|
|
* @q: the request queue for the target device
|
|
* @features: Required elevator features OR'ed together
|
|
*
|
|
* Tell the block layer that for the device controlled through @q, only the
|
|
* only elevators that can be used are those that implement at least the set of
|
|
* features specified by @features.
|
|
*/
|
|
void blk_queue_required_elevator_features(struct request_queue *q,
|
|
unsigned int features)
|
|
{
|
|
q->required_elevator_features = features;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features);
|
|
|
|
/**
|
|
* blk_queue_can_use_dma_map_merging - configure queue for merging segments.
|
|
* @q: the request queue for the device
|
|
* @dev: the device pointer for dma
|
|
*
|
|
* Tell the block layer about merging the segments by dma map of @q.
|
|
*/
|
|
bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
|
|
struct device *dev)
|
|
{
|
|
unsigned long boundary = dma_get_merge_boundary(dev);
|
|
|
|
if (!boundary)
|
|
return false;
|
|
|
|
/* No need to update max_segment_size. see blk_queue_virt_boundary() */
|
|
blk_queue_virt_boundary(q, boundary);
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging);
|
|
|
|
/**
|
|
* disk_set_zoned - inidicate a zoned device
|
|
* @disk: gendisk to configure
|
|
*/
|
|
void disk_set_zoned(struct gendisk *disk)
|
|
{
|
|
struct request_queue *q = disk->queue;
|
|
|
|
WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED));
|
|
|
|
/*
|
|
* Set the zone write granularity to the device logical block
|
|
* size by default. The driver can change this value if needed.
|
|
*/
|
|
q->limits.zoned = true;
|
|
blk_queue_zone_write_granularity(q, queue_logical_block_size(q));
|
|
}
|
|
EXPORT_SYMBOL_GPL(disk_set_zoned);
|
|
|
|
int bdev_alignment_offset(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q->limits.misaligned)
|
|
return -1;
|
|
if (bdev_is_partition(bdev))
|
|
return queue_limit_alignment_offset(&q->limits,
|
|
bdev->bd_start_sect);
|
|
return q->limits.alignment_offset;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bdev_alignment_offset);
|
|
|
|
unsigned int bdev_discard_alignment(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (bdev_is_partition(bdev))
|
|
return queue_limit_discard_alignment(&q->limits,
|
|
bdev->bd_start_sect);
|
|
return q->limits.discard_alignment;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bdev_discard_alignment);
|