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901 lines
28 KiB
901 lines
28 KiB
// 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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|
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#include "blk.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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/** |
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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_dev_sectors = 0; |
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lim->chunk_sectors = 0; |
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lim->max_write_same_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->discard_granularity = 0; |
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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 = BLK_ZONED_NONE; |
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lim->zone_write_granularity = 0; |
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} |
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EXPORT_SYMBOL(blk_set_default_limits); |
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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_same_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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printk(KERN_INFO "%s: set to minimum %d\n", |
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__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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max_sectors = min_t(unsigned int, max_sectors, BLK_DEF_MAX_SECTORS); |
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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_write_same_sectors - set max sectors for a single write same |
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* @q: the request queue for the device |
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* @max_write_same_sectors: maximum number of sectors to write per command |
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**/ |
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void blk_queue_max_write_same_sectors(struct request_queue *q, |
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unsigned int max_write_same_sectors) |
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{ |
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q->limits.max_write_same_sectors = max_write_same_sectors; |
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} |
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EXPORT_SYMBOL(blk_queue_max_write_same_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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printk(KERN_INFO "%s: set to minimum %d\n", |
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__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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printk(KERN_INFO "%s: set to minimum %d\n", |
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__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->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.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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/** |
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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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/** |
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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 |
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* sustained throughput is desired. |
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*/ |
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void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) |
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{ |
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limits->io_opt = opt; |
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} |
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EXPORT_SYMBOL(blk_limits_io_opt); |
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|
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/** |
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* blk_queue_io_opt - set optimal request size for the queue |
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* @q: the request queue for the device |
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* @opt: optimal request 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 |
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* sustained throughput is desired. |
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*/ |
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void blk_queue_io_opt(struct request_queue *q, unsigned int opt) |
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{ |
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blk_limits_io_opt(&q->limits, opt); |
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if (!q->disk) |
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return; |
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q->disk->bdi->ra_pages = |
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max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
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} |
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EXPORT_SYMBOL(blk_queue_io_opt); |
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|
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static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs) |
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{ |
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sectors = round_down(sectors, lbs >> SECTOR_SHIFT); |
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if (sectors < PAGE_SIZE >> SECTOR_SHIFT) |
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sectors = PAGE_SIZE >> SECTOR_SHIFT; |
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return sectors; |
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} |
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/** |
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* blk_stack_limits - adjust queue_limits for stacked devices |
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* @t: the stacking driver limits (top device) |
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* @b: the underlying queue limits (bottom, component device) |
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* @start: first data sector within component device |
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* |
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* Description: |
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* This function is used by stacking drivers like MD and DM to ensure |
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* that all component devices have compatible block sizes and |
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* alignments. The stacking driver must provide a queue_limits |
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* struct (top) and then iteratively call the stacking function for |
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* all component (bottom) devices. The stacking function will |
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* attempt to combine the values and ensure proper alignment. |
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* |
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* Returns 0 if the top and bottom queue_limits are compatible. The |
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* top device's block sizes and alignment offsets may be adjusted to |
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* ensure alignment with the bottom device. If no compatible sizes |
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* and alignments exist, -1 is returned and the resulting top |
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* queue_limits will have the misaligned flag set to indicate that |
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* the alignment_offset is undefined. |
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*/ |
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int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
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sector_t start) |
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{ |
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unsigned int top, bottom, alignment, ret = 0; |
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|
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t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
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t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); |
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t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
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t->max_write_same_sectors = min(t->max_write_same_sectors, |
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b->max_write_same_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); |
|
|
|
/* 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->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; |
|
printk(KERN_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->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->dma_alignment) |
|
q->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_WC, q); |
|
else |
|
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); |
|
|
|
wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); |
|
} |
|
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); |
|
|
|
/** |
|
* blk_queue_set_zoned - configure a disk queue zoned model. |
|
* @disk: the gendisk of the queue to configure |
|
* @model: the zoned model to set |
|
* |
|
* Set the zoned model of the request queue of @disk according to @model. |
|
* When @model is BLK_ZONED_HM (host managed), this should be called only |
|
* if zoned block device support is enabled (CONFIG_BLK_DEV_ZONED option). |
|
* If @model specifies BLK_ZONED_HA (host aware), the effective model used |
|
* depends on CONFIG_BLK_DEV_ZONED settings and on the existence of partitions |
|
* on the disk. |
|
*/ |
|
void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model) |
|
{ |
|
struct request_queue *q = disk->queue; |
|
|
|
switch (model) { |
|
case BLK_ZONED_HM: |
|
/* |
|
* Host managed devices are supported only if |
|
* CONFIG_BLK_DEV_ZONED is enabled. |
|
*/ |
|
WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)); |
|
break; |
|
case BLK_ZONED_HA: |
|
/* |
|
* Host aware devices can be treated either as regular block |
|
* devices (similar to drive managed devices) or as zoned block |
|
* devices to take advantage of the zone command set, similarly |
|
* to host managed devices. We try the latter if there are no |
|
* partitions and zoned block device support is enabled, else |
|
* we do nothing special as far as the block layer is concerned. |
|
*/ |
|
if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) || |
|
!xa_empty(&disk->part_tbl)) |
|
model = BLK_ZONED_NONE; |
|
break; |
|
case BLK_ZONED_NONE: |
|
default: |
|
if (WARN_ON_ONCE(model != BLK_ZONED_NONE)) |
|
model = BLK_ZONED_NONE; |
|
break; |
|
} |
|
|
|
q->limits.zoned = model; |
|
if (model != BLK_ZONED_NONE) { |
|
/* |
|
* Set the zone write granularity to the device logical block |
|
* size by default. The driver can change this value if needed. |
|
*/ |
|
blk_queue_zone_write_granularity(q, |
|
queue_logical_block_size(q)); |
|
} else { |
|
blk_queue_clear_zone_settings(q); |
|
} |
|
} |
|
EXPORT_SYMBOL_GPL(blk_queue_set_zoned);
|
|
|