Christoph Hellwig | 3dcf60bc | 2019-04-30 14:42:43 -0400 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 2 | /* |
| 3 | * Functions related to setting various queue properties from drivers |
| 4 | */ |
| 5 | #include <linux/kernel.h> |
| 6 | #include <linux/module.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/bio.h> |
| 9 | #include <linux/blkdev.h> |
Matthew Wilcox (Oracle) | 4ee60ec | 2021-05-06 18:02:27 -0700 | [diff] [blame] | 10 | #include <linux/pagemap.h> |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 11 | #include <linux/backing-dev-defs.h> |
Martin K. Petersen | 70dd5bf | 2009-07-31 11:49:12 -0400 | [diff] [blame] | 12 | #include <linux/gcd.h> |
Martin K. Petersen | 2cda272 | 2010-03-15 12:46:51 +0100 | [diff] [blame] | 13 | #include <linux/lcm.h> |
Randy Dunlap | ad5ebd2 | 2009-11-11 13:47:45 +0100 | [diff] [blame] | 14 | #include <linux/jiffies.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 15 | #include <linux/gfp.h> |
Yoshihiro Shimoda | 45147fb | 2019-08-28 21:35:42 +0900 | [diff] [blame] | 16 | #include <linux/dma-mapping.h> |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 17 | |
| 18 | #include "blk.h" |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 19 | #include "blk-wbt.h" |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 20 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 21 | void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) |
| 22 | { |
| 23 | q->rq_timeout = timeout; |
| 24 | } |
| 25 | EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); |
| 26 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 27 | /** |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 28 | * blk_set_default_limits - reset limits to default values |
Randy Dunlap | f740f5ca | 2009-06-19 09:18:32 +0200 | [diff] [blame] | 29 | * @lim: the queue_limits structure to reset |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 30 | * |
| 31 | * Description: |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 32 | * Returns a queue_limit struct to its default state. |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 33 | */ |
| 34 | void blk_set_default_limits(struct queue_limits *lim) |
| 35 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 36 | lim->max_segments = BLK_MAX_SEGMENTS; |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 37 | lim->max_discard_segments = 1; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 38 | lim->max_integrity_segments = 0; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 39 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 40 | lim->virt_boundary_mask = 0; |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 41 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
Keith Busch | 5f009d3 | 2016-02-10 16:52:47 -0700 | [diff] [blame] | 42 | lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; |
| 43 | lim->max_dev_sectors = 0; |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 44 | lim->chunk_sectors = 0; |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 45 | lim->max_write_zeroes_sectors = 0; |
Keith Busch | 0512a75 | 2020-05-12 17:55:47 +0900 | [diff] [blame] | 46 | lim->max_zone_append_sectors = 0; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 47 | lim->max_discard_sectors = 0; |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 48 | lim->max_hw_discard_sectors = 0; |
Christoph Hellwig | 44abff2c | 2022-04-15 06:52:57 +0200 | [diff] [blame] | 49 | lim->max_secure_erase_sectors = 0; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 50 | lim->discard_granularity = 0; |
| 51 | lim->discard_alignment = 0; |
| 52 | lim->discard_misaligned = 0; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 53 | lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; |
Christoph Hellwig | 9bb33f2 | 2021-03-31 09:30:00 +0200 | [diff] [blame] | 54 | lim->bounce = BLK_BOUNCE_NONE; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 55 | lim->alignment_offset = 0; |
| 56 | lim->io_opt = 0; |
| 57 | lim->misaligned = 0; |
Damien Le Moal | 797476b | 2016-10-18 15:40:29 +0900 | [diff] [blame] | 58 | lim->zoned = BLK_ZONED_NONE; |
Damien Le Moal | a805a4f | 2021-01-28 13:47:30 +0900 | [diff] [blame] | 59 | lim->zone_write_granularity = 0; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 60 | } |
| 61 | EXPORT_SYMBOL(blk_set_default_limits); |
| 62 | |
| 63 | /** |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 64 | * blk_set_stacking_limits - set default limits for stacking devices |
| 65 | * @lim: the queue_limits structure to reset |
| 66 | * |
| 67 | * Description: |
| 68 | * Returns a queue_limit struct to its default state. Should be used |
| 69 | * by stacking drivers like DM that have no internal limits. |
| 70 | */ |
| 71 | void blk_set_stacking_limits(struct queue_limits *lim) |
| 72 | { |
| 73 | blk_set_default_limits(lim); |
| 74 | |
| 75 | /* Inherit limits from component devices */ |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 76 | lim->max_segments = USHRT_MAX; |
Mike Snitzer | 42c9cdf | 2018-07-20 14:57:38 -0400 | [diff] [blame] | 77 | lim->max_discard_segments = USHRT_MAX; |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 78 | lim->max_hw_sectors = UINT_MAX; |
Mike Snitzer | d82ae52 | 2013-10-18 09:44:49 -0600 | [diff] [blame] | 79 | lim->max_segment_size = UINT_MAX; |
Mike Snitzer | fe86cdc | 2012-08-01 10:44:28 +0200 | [diff] [blame] | 80 | lim->max_sectors = UINT_MAX; |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 81 | lim->max_dev_sectors = UINT_MAX; |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 82 | lim->max_write_zeroes_sectors = UINT_MAX; |
Keith Busch | 0512a75 | 2020-05-12 17:55:47 +0900 | [diff] [blame] | 83 | lim->max_zone_append_sectors = UINT_MAX; |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 84 | } |
| 85 | EXPORT_SYMBOL(blk_set_stacking_limits); |
| 86 | |
| 87 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 88 | * blk_queue_bounce_limit - set bounce buffer limit for queue |
Tejun Heo | cd0aca2 | 2009-04-15 22:10:25 +0900 | [diff] [blame] | 89 | * @q: the request queue for the device |
Christoph Hellwig | 9bb33f2 | 2021-03-31 09:30:00 +0200 | [diff] [blame] | 90 | * @bounce: bounce limit to enforce |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 91 | * |
| 92 | * Description: |
Christoph Hellwig | 9bb33f2 | 2021-03-31 09:30:00 +0200 | [diff] [blame] | 93 | * Force bouncing for ISA DMA ranges or highmem. |
| 94 | * |
| 95 | * DEPRECATED, don't use in new code. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 96 | **/ |
Christoph Hellwig | 9bb33f2 | 2021-03-31 09:30:00 +0200 | [diff] [blame] | 97 | void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 98 | { |
Christoph Hellwig | 9bb33f2 | 2021-03-31 09:30:00 +0200 | [diff] [blame] | 99 | q->limits.bounce = bounce; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 100 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 101 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
| 102 | |
| 103 | /** |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 104 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
| 105 | * @q: the request queue for the device |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 106 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 107 | * |
| 108 | * Description: |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 109 | * Enables a low level driver to set a hard upper limit, |
| 110 | * max_hw_sectors, on the size of requests. max_hw_sectors is set by |
Martin K. Petersen | 4f258a4 | 2015-06-23 12:13:59 -0400 | [diff] [blame] | 111 | * the device driver based upon the capabilities of the I/O |
| 112 | * controller. |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 113 | * |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 114 | * max_dev_sectors is a hard limit imposed by the storage device for |
| 115 | * READ/WRITE requests. It is set by the disk driver. |
| 116 | * |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 117 | * max_sectors is a soft limit imposed by the block layer for |
| 118 | * filesystem type requests. This value can be overridden on a |
| 119 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. |
| 120 | * The soft limit can not exceed max_hw_sectors. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 121 | **/ |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 122 | void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 123 | { |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 124 | struct queue_limits *limits = &q->limits; |
| 125 | unsigned int max_sectors; |
| 126 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 127 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
| 128 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 129 | printk(KERN_INFO "%s: set to minimum %d\n", |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 130 | __func__, max_hw_sectors); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 131 | } |
| 132 | |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 133 | max_hw_sectors = round_down(max_hw_sectors, |
| 134 | limits->logical_block_size >> SECTOR_SHIFT); |
Jeff Moyer | 30e2bc0 | 2015-08-13 14:57:56 -0400 | [diff] [blame] | 135 | limits->max_hw_sectors = max_hw_sectors; |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 136 | |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 137 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
| 138 | max_sectors = min_t(unsigned int, max_sectors, BLK_DEF_MAX_SECTORS); |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 139 | max_sectors = round_down(max_sectors, |
| 140 | limits->logical_block_size >> SECTOR_SHIFT); |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 141 | limits->max_sectors = max_sectors; |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 142 | |
Christoph Hellwig | d152c68 | 2021-08-16 15:46:24 +0200 | [diff] [blame] | 143 | if (!q->disk) |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 144 | return; |
Christoph Hellwig | d152c68 | 2021-08-16 15:46:24 +0200 | [diff] [blame] | 145 | q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 146 | } |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 147 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 148 | |
| 149 | /** |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 150 | * blk_queue_chunk_sectors - set size of the chunk for this queue |
| 151 | * @q: the request queue for the device |
| 152 | * @chunk_sectors: chunk sectors in the usual 512b unit |
| 153 | * |
| 154 | * Description: |
| 155 | * If a driver doesn't want IOs to cross a given chunk size, it can set |
Mike Snitzer | 07d098e | 2020-09-21 22:32:49 -0400 | [diff] [blame] | 156 | * this limit and prevent merging across chunks. Note that the block layer |
| 157 | * must accept a page worth of data at any offset. So if the crossing of |
| 158 | * chunks is a hard limitation in the driver, it must still be prepared |
| 159 | * to split single page bios. |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 160 | **/ |
| 161 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) |
| 162 | { |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 163 | q->limits.chunk_sectors = chunk_sectors; |
| 164 | } |
| 165 | EXPORT_SYMBOL(blk_queue_chunk_sectors); |
| 166 | |
| 167 | /** |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 168 | * blk_queue_max_discard_sectors - set max sectors for a single discard |
| 169 | * @q: the request queue for the device |
Randy Dunlap | c7ebf06 | 2009-10-12 08:20:47 +0200 | [diff] [blame] | 170 | * @max_discard_sectors: maximum number of sectors to discard |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 171 | **/ |
| 172 | void blk_queue_max_discard_sectors(struct request_queue *q, |
| 173 | unsigned int max_discard_sectors) |
| 174 | { |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 175 | q->limits.max_hw_discard_sectors = max_discard_sectors; |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 176 | q->limits.max_discard_sectors = max_discard_sectors; |
| 177 | } |
| 178 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); |
| 179 | |
| 180 | /** |
Christoph Hellwig | 44abff2c | 2022-04-15 06:52:57 +0200 | [diff] [blame] | 181 | * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase |
| 182 | * @q: the request queue for the device |
| 183 | * @max_sectors: maximum number of sectors to secure_erase |
| 184 | **/ |
| 185 | void blk_queue_max_secure_erase_sectors(struct request_queue *q, |
| 186 | unsigned int max_sectors) |
| 187 | { |
| 188 | q->limits.max_secure_erase_sectors = max_sectors; |
| 189 | } |
| 190 | EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors); |
| 191 | |
| 192 | /** |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 193 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single |
| 194 | * write zeroes |
| 195 | * @q: the request queue for the device |
| 196 | * @max_write_zeroes_sectors: maximum number of sectors to write per command |
| 197 | **/ |
| 198 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
| 199 | unsigned int max_write_zeroes_sectors) |
| 200 | { |
| 201 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; |
| 202 | } |
| 203 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); |
| 204 | |
| 205 | /** |
Keith Busch | 0512a75 | 2020-05-12 17:55:47 +0900 | [diff] [blame] | 206 | * blk_queue_max_zone_append_sectors - set max sectors for a single zone append |
| 207 | * @q: the request queue for the device |
| 208 | * @max_zone_append_sectors: maximum number of sectors to write per command |
| 209 | **/ |
| 210 | void blk_queue_max_zone_append_sectors(struct request_queue *q, |
| 211 | unsigned int max_zone_append_sectors) |
| 212 | { |
| 213 | unsigned int max_sectors; |
| 214 | |
| 215 | if (WARN_ON(!blk_queue_is_zoned(q))) |
| 216 | return; |
| 217 | |
| 218 | max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors); |
| 219 | max_sectors = min(q->limits.chunk_sectors, max_sectors); |
| 220 | |
| 221 | /* |
| 222 | * Signal eventual driver bugs resulting in the max_zone_append sectors limit |
| 223 | * being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set, |
| 224 | * or the max_hw_sectors limit not set. |
| 225 | */ |
| 226 | WARN_ON(!max_sectors); |
| 227 | |
| 228 | q->limits.max_zone_append_sectors = max_sectors; |
| 229 | } |
| 230 | EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors); |
| 231 | |
| 232 | /** |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 233 | * blk_queue_max_segments - set max hw segments for a request for this queue |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 234 | * @q: the request queue for the device |
| 235 | * @max_segments: max number of segments |
| 236 | * |
| 237 | * Description: |
| 238 | * Enables a low level driver to set an upper limit on the number of |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 239 | * hw data segments in a request. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 240 | **/ |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 241 | void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 242 | { |
| 243 | if (!max_segments) { |
| 244 | max_segments = 1; |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 245 | printk(KERN_INFO "%s: set to minimum %d\n", |
| 246 | __func__, max_segments); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 247 | } |
| 248 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 249 | q->limits.max_segments = max_segments; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 250 | } |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 251 | EXPORT_SYMBOL(blk_queue_max_segments); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 252 | |
| 253 | /** |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 254 | * blk_queue_max_discard_segments - set max segments for discard requests |
| 255 | * @q: the request queue for the device |
| 256 | * @max_segments: max number of segments |
| 257 | * |
| 258 | * Description: |
| 259 | * Enables a low level driver to set an upper limit on the number of |
| 260 | * segments in a discard request. |
| 261 | **/ |
| 262 | void blk_queue_max_discard_segments(struct request_queue *q, |
| 263 | unsigned short max_segments) |
| 264 | { |
| 265 | q->limits.max_discard_segments = max_segments; |
| 266 | } |
| 267 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); |
| 268 | |
| 269 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 270 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg |
| 271 | * @q: the request queue for the device |
| 272 | * @max_size: max size of segment in bytes |
| 273 | * |
| 274 | * Description: |
| 275 | * Enables a low level driver to set an upper limit on the size of a |
| 276 | * coalesced segment |
| 277 | **/ |
| 278 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) |
| 279 | { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 280 | if (max_size < PAGE_SIZE) { |
| 281 | max_size = PAGE_SIZE; |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 282 | printk(KERN_INFO "%s: set to minimum %d\n", |
| 283 | __func__, max_size); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 284 | } |
| 285 | |
Christoph Hellwig | 09324d3 | 2019-05-21 09:01:41 +0200 | [diff] [blame] | 286 | /* see blk_queue_virt_boundary() for the explanation */ |
| 287 | WARN_ON_ONCE(q->limits.virt_boundary_mask); |
| 288 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 289 | q->limits.max_segment_size = max_size; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 290 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 291 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
| 292 | |
| 293 | /** |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 294 | * blk_queue_logical_block_size - set logical block size for the queue |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 295 | * @q: the request queue for the device |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 296 | * @size: the logical block size, in bytes |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 297 | * |
| 298 | * Description: |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 299 | * This should be set to the lowest possible block size that the |
| 300 | * storage device can address. The default of 512 covers most |
| 301 | * hardware. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 302 | **/ |
Mikulas Patocka | ad6bf88 | 2020-01-15 08:35:25 -0500 | [diff] [blame] | 303 | void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 304 | { |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 305 | struct queue_limits *limits = &q->limits; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 306 | |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 307 | limits->logical_block_size = size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 308 | |
Damien Le Moal | 817046e | 2020-11-20 10:55:13 +0900 | [diff] [blame] | 309 | if (limits->physical_block_size < size) |
| 310 | limits->physical_block_size = size; |
| 311 | |
| 312 | if (limits->io_min < limits->physical_block_size) |
| 313 | limits->io_min = limits->physical_block_size; |
| 314 | |
| 315 | limits->max_hw_sectors = |
| 316 | round_down(limits->max_hw_sectors, size >> SECTOR_SHIFT); |
| 317 | limits->max_sectors = |
| 318 | round_down(limits->max_sectors, size >> SECTOR_SHIFT); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 319 | } |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 320 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 321 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 322 | /** |
| 323 | * blk_queue_physical_block_size - set physical block size for the queue |
| 324 | * @q: the request queue for the device |
| 325 | * @size: the physical block size, in bytes |
| 326 | * |
| 327 | * Description: |
| 328 | * This should be set to the lowest possible sector size that the |
| 329 | * hardware can operate on without reverting to read-modify-write |
| 330 | * operations. |
| 331 | */ |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 332 | void blk_queue_physical_block_size(struct request_queue *q, unsigned int size) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 333 | { |
| 334 | q->limits.physical_block_size = size; |
| 335 | |
| 336 | if (q->limits.physical_block_size < q->limits.logical_block_size) |
| 337 | q->limits.physical_block_size = q->limits.logical_block_size; |
| 338 | |
| 339 | if (q->limits.io_min < q->limits.physical_block_size) |
| 340 | q->limits.io_min = q->limits.physical_block_size; |
| 341 | } |
| 342 | EXPORT_SYMBOL(blk_queue_physical_block_size); |
| 343 | |
| 344 | /** |
Damien Le Moal | a805a4f | 2021-01-28 13:47:30 +0900 | [diff] [blame] | 345 | * blk_queue_zone_write_granularity - set zone write granularity for the queue |
| 346 | * @q: the request queue for the zoned device |
| 347 | * @size: the zone write granularity size, in bytes |
| 348 | * |
| 349 | * Description: |
| 350 | * This should be set to the lowest possible size allowing to write in |
| 351 | * sequential zones of a zoned block device. |
| 352 | */ |
| 353 | void blk_queue_zone_write_granularity(struct request_queue *q, |
| 354 | unsigned int size) |
| 355 | { |
| 356 | if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) |
| 357 | return; |
| 358 | |
| 359 | q->limits.zone_write_granularity = size; |
| 360 | |
| 361 | if (q->limits.zone_write_granularity < q->limits.logical_block_size) |
| 362 | q->limits.zone_write_granularity = q->limits.logical_block_size; |
| 363 | } |
| 364 | EXPORT_SYMBOL_GPL(blk_queue_zone_write_granularity); |
| 365 | |
| 366 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 367 | * blk_queue_alignment_offset - set physical block alignment offset |
| 368 | * @q: the request queue for the device |
Randy Dunlap | 8ebf975 | 2009-06-11 20:00:41 -0700 | [diff] [blame] | 369 | * @offset: alignment offset in bytes |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 370 | * |
| 371 | * Description: |
| 372 | * Some devices are naturally misaligned to compensate for things like |
| 373 | * the legacy DOS partition table 63-sector offset. Low-level drivers |
| 374 | * should call this function for devices whose first sector is not |
| 375 | * naturally aligned. |
| 376 | */ |
| 377 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) |
| 378 | { |
| 379 | q->limits.alignment_offset = |
| 380 | offset & (q->limits.physical_block_size - 1); |
| 381 | q->limits.misaligned = 0; |
| 382 | } |
| 383 | EXPORT_SYMBOL(blk_queue_alignment_offset); |
| 384 | |
Christoph Hellwig | 471aa70 | 2021-08-09 16:17:41 +0200 | [diff] [blame] | 385 | void disk_update_readahead(struct gendisk *disk) |
Christoph Hellwig | c2e4cd5 | 2020-09-24 08:51:34 +0200 | [diff] [blame] | 386 | { |
Christoph Hellwig | 471aa70 | 2021-08-09 16:17:41 +0200 | [diff] [blame] | 387 | struct request_queue *q = disk->queue; |
| 388 | |
Christoph Hellwig | c2e4cd5 | 2020-09-24 08:51:34 +0200 | [diff] [blame] | 389 | /* |
| 390 | * For read-ahead of large files to be effective, we need to read ahead |
| 391 | * at least twice the optimal I/O size. |
| 392 | */ |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 393 | disk->bdi->ra_pages = |
Christoph Hellwig | c2e4cd5 | 2020-09-24 08:51:34 +0200 | [diff] [blame] | 394 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 395 | disk->bdi->io_pages = queue_max_sectors(q) >> (PAGE_SHIFT - 9); |
Christoph Hellwig | c2e4cd5 | 2020-09-24 08:51:34 +0200 | [diff] [blame] | 396 | } |
Christoph Hellwig | 471aa70 | 2021-08-09 16:17:41 +0200 | [diff] [blame] | 397 | EXPORT_SYMBOL_GPL(disk_update_readahead); |
Christoph Hellwig | c2e4cd5 | 2020-09-24 08:51:34 +0200 | [diff] [blame] | 398 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 399 | /** |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 400 | * blk_limits_io_min - set minimum request size for a device |
| 401 | * @limits: the queue limits |
| 402 | * @min: smallest I/O size in bytes |
| 403 | * |
| 404 | * Description: |
| 405 | * Some devices have an internal block size bigger than the reported |
| 406 | * hardware sector size. This function can be used to signal the |
| 407 | * smallest I/O the device can perform without incurring a performance |
| 408 | * penalty. |
| 409 | */ |
| 410 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) |
| 411 | { |
| 412 | limits->io_min = min; |
| 413 | |
| 414 | if (limits->io_min < limits->logical_block_size) |
| 415 | limits->io_min = limits->logical_block_size; |
| 416 | |
| 417 | if (limits->io_min < limits->physical_block_size) |
| 418 | limits->io_min = limits->physical_block_size; |
| 419 | } |
| 420 | EXPORT_SYMBOL(blk_limits_io_min); |
| 421 | |
| 422 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 423 | * blk_queue_io_min - set minimum request size for the queue |
| 424 | * @q: the request queue for the device |
Randy Dunlap | 8ebf975 | 2009-06-11 20:00:41 -0700 | [diff] [blame] | 425 | * @min: smallest I/O size in bytes |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 426 | * |
| 427 | * Description: |
Martin K. Petersen | 7e5f5fb | 2009-07-31 11:49:13 -0400 | [diff] [blame] | 428 | * Storage devices may report a granularity or preferred minimum I/O |
| 429 | * size which is the smallest request the device can perform without |
| 430 | * incurring a performance penalty. For disk drives this is often the |
| 431 | * physical block size. For RAID arrays it is often the stripe chunk |
| 432 | * size. A properly aligned multiple of minimum_io_size is the |
| 433 | * preferred request size for workloads where a high number of I/O |
| 434 | * operations is desired. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 435 | */ |
| 436 | void blk_queue_io_min(struct request_queue *q, unsigned int min) |
| 437 | { |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 438 | blk_limits_io_min(&q->limits, min); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 439 | } |
| 440 | EXPORT_SYMBOL(blk_queue_io_min); |
| 441 | |
| 442 | /** |
Martin K. Petersen | 3c5820c | 2009-09-11 21:54:52 +0200 | [diff] [blame] | 443 | * blk_limits_io_opt - set optimal request size for a device |
| 444 | * @limits: the queue limits |
| 445 | * @opt: smallest I/O size in bytes |
| 446 | * |
| 447 | * Description: |
| 448 | * Storage devices may report an optimal I/O size, which is the |
| 449 | * device's preferred unit for sustained I/O. This is rarely reported |
| 450 | * for disk drives. For RAID arrays it is usually the stripe width or |
| 451 | * the internal track size. A properly aligned multiple of |
| 452 | * optimal_io_size is the preferred request size for workloads where |
| 453 | * sustained throughput is desired. |
| 454 | */ |
| 455 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) |
| 456 | { |
| 457 | limits->io_opt = opt; |
| 458 | } |
| 459 | EXPORT_SYMBOL(blk_limits_io_opt); |
| 460 | |
| 461 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 462 | * blk_queue_io_opt - set optimal request size for the queue |
| 463 | * @q: the request queue for the device |
Randy Dunlap | 8ebf975 | 2009-06-11 20:00:41 -0700 | [diff] [blame] | 464 | * @opt: optimal request size in bytes |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 465 | * |
| 466 | * Description: |
Martin K. Petersen | 7e5f5fb | 2009-07-31 11:49:13 -0400 | [diff] [blame] | 467 | * Storage devices may report an optimal I/O size, which is the |
| 468 | * device's preferred unit for sustained I/O. This is rarely reported |
| 469 | * for disk drives. For RAID arrays it is usually the stripe width or |
| 470 | * the internal track size. A properly aligned multiple of |
| 471 | * optimal_io_size is the preferred request size for workloads where |
| 472 | * sustained throughput is desired. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 473 | */ |
| 474 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) |
| 475 | { |
Martin K. Petersen | 3c5820c | 2009-09-11 21:54:52 +0200 | [diff] [blame] | 476 | blk_limits_io_opt(&q->limits, opt); |
Christoph Hellwig | d152c68 | 2021-08-16 15:46:24 +0200 | [diff] [blame] | 477 | if (!q->disk) |
Christoph Hellwig | edb0872 | 2021-08-09 16:17:43 +0200 | [diff] [blame] | 478 | return; |
Christoph Hellwig | d152c68 | 2021-08-16 15:46:24 +0200 | [diff] [blame] | 479 | q->disk->bdi->ra_pages = |
Christoph Hellwig | c2e4cd5 | 2020-09-24 08:51:34 +0200 | [diff] [blame] | 480 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 481 | } |
| 482 | EXPORT_SYMBOL(blk_queue_io_opt); |
| 483 | |
Christoph Hellwig | 89098b0 | 2022-04-15 06:52:49 +0200 | [diff] [blame] | 484 | static int queue_limit_alignment_offset(struct queue_limits *lim, |
| 485 | sector_t sector) |
| 486 | { |
| 487 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
| 488 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
| 489 | << SECTOR_SHIFT; |
| 490 | |
| 491 | return (granularity + lim->alignment_offset - alignment) % granularity; |
| 492 | } |
| 493 | |
Christoph Hellwig | 5c4b4a5 | 2022-04-15 06:52:52 +0200 | [diff] [blame] | 494 | static unsigned int queue_limit_discard_alignment(struct queue_limits *lim, |
| 495 | sector_t sector) |
| 496 | { |
| 497 | unsigned int alignment, granularity, offset; |
| 498 | |
| 499 | if (!lim->max_discard_sectors) |
| 500 | return 0; |
| 501 | |
| 502 | /* Why are these in bytes, not sectors? */ |
| 503 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
| 504 | granularity = lim->discard_granularity >> SECTOR_SHIFT; |
| 505 | if (!granularity) |
| 506 | return 0; |
| 507 | |
| 508 | /* Offset of the partition start in 'granularity' sectors */ |
| 509 | offset = sector_div(sector, granularity); |
| 510 | |
| 511 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
| 512 | offset = (granularity + alignment - offset) % granularity; |
| 513 | |
| 514 | /* Turn it back into bytes, gaah */ |
| 515 | return offset << SECTOR_SHIFT; |
| 516 | } |
| 517 | |
Mikulas Patocka | 97f433c | 2021-02-23 19:25:30 -0700 | [diff] [blame] | 518 | static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs) |
| 519 | { |
| 520 | sectors = round_down(sectors, lbs >> SECTOR_SHIFT); |
| 521 | if (sectors < PAGE_SIZE >> SECTOR_SHIFT) |
| 522 | sectors = PAGE_SIZE >> SECTOR_SHIFT; |
| 523 | return sectors; |
| 524 | } |
| 525 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 526 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 527 | * blk_stack_limits - adjust queue_limits for stacked devices |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 528 | * @t: the stacking driver limits (top device) |
| 529 | * @b: the underlying queue limits (bottom, component device) |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 530 | * @start: first data sector within component device |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 531 | * |
| 532 | * Description: |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 533 | * This function is used by stacking drivers like MD and DM to ensure |
| 534 | * that all component devices have compatible block sizes and |
| 535 | * alignments. The stacking driver must provide a queue_limits |
| 536 | * struct (top) and then iteratively call the stacking function for |
| 537 | * all component (bottom) devices. The stacking function will |
| 538 | * attempt to combine the values and ensure proper alignment. |
| 539 | * |
| 540 | * Returns 0 if the top and bottom queue_limits are compatible. The |
| 541 | * top device's block sizes and alignment offsets may be adjusted to |
| 542 | * ensure alignment with the bottom device. If no compatible sizes |
| 543 | * and alignments exist, -1 is returned and the resulting top |
| 544 | * queue_limits will have the misaligned flag set to indicate that |
| 545 | * the alignment_offset is undefined. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 546 | */ |
| 547 | int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 548 | sector_t start) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 549 | { |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 550 | unsigned int top, bottom, alignment, ret = 0; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 551 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 552 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
| 553 | t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 554 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 555 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
| 556 | b->max_write_zeroes_sectors); |
Keith Busch | 0512a75 | 2020-05-12 17:55:47 +0900 | [diff] [blame] | 557 | t->max_zone_append_sectors = min(t->max_zone_append_sectors, |
| 558 | b->max_zone_append_sectors); |
Christoph Hellwig | 9bb33f2 | 2021-03-31 09:30:00 +0200 | [diff] [blame] | 559 | t->bounce = max(t->bounce, b->bounce); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 560 | |
| 561 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, |
| 562 | b->seg_boundary_mask); |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 563 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
| 564 | b->virt_boundary_mask); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 565 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 566 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 567 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
| 568 | b->max_discard_segments); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 569 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
| 570 | b->max_integrity_segments); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 571 | |
| 572 | t->max_segment_size = min_not_zero(t->max_segment_size, |
| 573 | b->max_segment_size); |
| 574 | |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 575 | t->misaligned |= b->misaligned; |
| 576 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 577 | alignment = queue_limit_alignment_offset(b, start); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 578 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 579 | /* Bottom device has different alignment. Check that it is |
| 580 | * compatible with the current top alignment. |
| 581 | */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 582 | if (t->alignment_offset != alignment) { |
| 583 | |
| 584 | top = max(t->physical_block_size, t->io_min) |
| 585 | + t->alignment_offset; |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 586 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 587 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 588 | /* Verify that top and bottom intervals line up */ |
Mike Snitzer | b8839b8 | 2014-10-08 18:26:13 -0400 | [diff] [blame] | 589 | if (max(top, bottom) % min(top, bottom)) { |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 590 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 591 | ret = -1; |
| 592 | } |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 593 | } |
| 594 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 595 | t->logical_block_size = max(t->logical_block_size, |
| 596 | b->logical_block_size); |
| 597 | |
| 598 | t->physical_block_size = max(t->physical_block_size, |
| 599 | b->physical_block_size); |
| 600 | |
| 601 | t->io_min = max(t->io_min, b->io_min); |
Mike Snitzer | e963741 | 2015-03-30 13:39:09 -0400 | [diff] [blame] | 602 | t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); |
Mike Snitzer | 7e7986f | 2020-12-01 11:07:09 -0500 | [diff] [blame] | 603 | |
| 604 | /* Set non-power-of-2 compatible chunk_sectors boundary */ |
| 605 | if (b->chunk_sectors) |
| 606 | t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 607 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 608 | /* Physical block size a multiple of the logical block size? */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 609 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
| 610 | t->physical_block_size = t->logical_block_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 611 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 612 | ret = -1; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 613 | } |
| 614 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 615 | /* Minimum I/O a multiple of the physical block size? */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 616 | if (t->io_min & (t->physical_block_size - 1)) { |
| 617 | t->io_min = t->physical_block_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 618 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 619 | ret = -1; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 620 | } |
| 621 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 622 | /* Optimal I/O a multiple of the physical block size? */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 623 | if (t->io_opt & (t->physical_block_size - 1)) { |
| 624 | t->io_opt = 0; |
| 625 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 626 | ret = -1; |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 627 | } |
Martin K. Petersen | 70dd5bf | 2009-07-31 11:49:12 -0400 | [diff] [blame] | 628 | |
Mike Snitzer | 22ada80 | 2020-09-21 22:32:48 -0400 | [diff] [blame] | 629 | /* chunk_sectors a multiple of the physical block size? */ |
| 630 | if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) { |
| 631 | t->chunk_sectors = 0; |
| 632 | t->misaligned = 1; |
| 633 | ret = -1; |
| 634 | } |
| 635 | |
Kent Overstreet | c78afc6 | 2013-07-11 22:39:53 -0700 | [diff] [blame] | 636 | t->raid_partial_stripes_expensive = |
| 637 | max(t->raid_partial_stripes_expensive, |
| 638 | b->raid_partial_stripes_expensive); |
| 639 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 640 | /* Find lowest common alignment_offset */ |
Mike Snitzer | e963741 | 2015-03-30 13:39:09 -0400 | [diff] [blame] | 641 | t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) |
Mike Snitzer | b8839b8 | 2014-10-08 18:26:13 -0400 | [diff] [blame] | 642 | % max(t->physical_block_size, t->io_min); |
Martin K. Petersen | 70dd5bf | 2009-07-31 11:49:12 -0400 | [diff] [blame] | 643 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 644 | /* Verify that new alignment_offset is on a logical block boundary */ |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 645 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 646 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 647 | ret = -1; |
| 648 | } |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 649 | |
Mikulas Patocka | 97f433c | 2021-02-23 19:25:30 -0700 | [diff] [blame] | 650 | t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size); |
| 651 | t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size); |
| 652 | t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size); |
| 653 | |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 654 | /* Discard alignment and granularity */ |
| 655 | if (b->discard_granularity) { |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 656 | alignment = queue_limit_discard_alignment(b, start); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 657 | |
| 658 | if (t->discard_granularity != 0 && |
| 659 | t->discard_alignment != alignment) { |
| 660 | top = t->discard_granularity + t->discard_alignment; |
| 661 | bottom = b->discard_granularity + alignment; |
| 662 | |
| 663 | /* Verify that top and bottom intervals line up */ |
Shaohua Li | 8dd2cb7 | 2012-12-14 11:15:36 +0800 | [diff] [blame] | 664 | if ((max(top, bottom) % min(top, bottom)) != 0) |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 665 | t->discard_misaligned = 1; |
| 666 | } |
| 667 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 668 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
| 669 | b->max_discard_sectors); |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 670 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
| 671 | b->max_hw_discard_sectors); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 672 | t->discard_granularity = max(t->discard_granularity, |
| 673 | b->discard_granularity); |
Mike Snitzer | e963741 | 2015-03-30 13:39:09 -0400 | [diff] [blame] | 674 | t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % |
Shaohua Li | 8dd2cb7 | 2012-12-14 11:15:36 +0800 | [diff] [blame] | 675 | t->discard_granularity; |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 676 | } |
Christoph Hellwig | 44abff2c | 2022-04-15 06:52:57 +0200 | [diff] [blame] | 677 | t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors, |
| 678 | b->max_secure_erase_sectors); |
Damien Le Moal | a805a4f | 2021-01-28 13:47:30 +0900 | [diff] [blame] | 679 | t->zone_write_granularity = max(t->zone_write_granularity, |
| 680 | b->zone_write_granularity); |
Christoph Hellwig | 3093a47 | 2020-07-20 08:12:49 +0200 | [diff] [blame] | 681 | t->zoned = max(t->zoned, b->zoned); |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 682 | return ret; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 683 | } |
Mike Snitzer | 5d85d32 | 2009-05-28 11:04:53 +0200 | [diff] [blame] | 684 | EXPORT_SYMBOL(blk_stack_limits); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 685 | |
| 686 | /** |
| 687 | * disk_stack_limits - adjust queue limits for stacked drivers |
Martin K. Petersen | 77634f3 | 2009-06-09 06:23:22 +0200 | [diff] [blame] | 688 | * @disk: MD/DM gendisk (top) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 689 | * @bdev: the underlying block device (bottom) |
| 690 | * @offset: offset to beginning of data within component device |
| 691 | * |
| 692 | * Description: |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 693 | * Merges the limits for a top level gendisk and a bottom level |
| 694 | * block_device. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 695 | */ |
| 696 | void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 697 | sector_t offset) |
| 698 | { |
| 699 | struct request_queue *t = disk->queue; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 700 | |
Christoph Hellwig | 9efa82e | 2020-07-20 08:12:50 +0200 | [diff] [blame] | 701 | if (blk_stack_limits(&t->limits, &bdev_get_queue(bdev)->limits, |
Christoph Hellwig | 453b8ab | 2021-07-27 08:25:16 +0200 | [diff] [blame] | 702 | get_start_sect(bdev) + (offset >> 9)) < 0) |
| 703 | pr_notice("%s: Warning: Device %pg is misaligned\n", |
| 704 | disk->disk_name, bdev); |
Konstantin Khlebnikov | e74d93e | 2020-02-28 17:51:48 +0300 | [diff] [blame] | 705 | |
Christoph Hellwig | 471aa70 | 2021-08-09 16:17:41 +0200 | [diff] [blame] | 706 | disk_update_readahead(disk); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 707 | } |
| 708 | EXPORT_SYMBOL(disk_stack_limits); |
| 709 | |
| 710 | /** |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 711 | * blk_queue_update_dma_pad - update pad mask |
| 712 | * @q: the request queue for the device |
| 713 | * @mask: pad mask |
| 714 | * |
| 715 | * Update dma pad mask. |
| 716 | * |
| 717 | * Appending pad buffer to a request modifies the last entry of a |
| 718 | * scatter list such that it includes the pad buffer. |
| 719 | **/ |
| 720 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) |
| 721 | { |
| 722 | if (mask > q->dma_pad_mask) |
| 723 | q->dma_pad_mask = mask; |
| 724 | } |
| 725 | EXPORT_SYMBOL(blk_queue_update_dma_pad); |
| 726 | |
| 727 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 728 | * blk_queue_segment_boundary - set boundary rules for segment merging |
| 729 | * @q: the request queue for the device |
| 730 | * @mask: the memory boundary mask |
| 731 | **/ |
| 732 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) |
| 733 | { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 734 | if (mask < PAGE_SIZE - 1) { |
| 735 | mask = PAGE_SIZE - 1; |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 736 | printk(KERN_INFO "%s: set to minimum %lx\n", |
| 737 | __func__, mask); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 738 | } |
| 739 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 740 | q->limits.seg_boundary_mask = mask; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 741 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 742 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
| 743 | |
| 744 | /** |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 745 | * blk_queue_virt_boundary - set boundary rules for bio merging |
| 746 | * @q: the request queue for the device |
| 747 | * @mask: the memory boundary mask |
| 748 | **/ |
| 749 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) |
| 750 | { |
| 751 | q->limits.virt_boundary_mask = mask; |
Christoph Hellwig | 09324d3 | 2019-05-21 09:01:41 +0200 | [diff] [blame] | 752 | |
| 753 | /* |
| 754 | * Devices that require a virtual boundary do not support scatter/gather |
| 755 | * I/O natively, but instead require a descriptor list entry for each |
| 756 | * page (which might not be idential to the Linux PAGE_SIZE). Because |
| 757 | * of that they are not limited by our notion of "segment size". |
| 758 | */ |
Christoph Hellwig | c6c84f7 | 2019-07-24 18:26:56 +0200 | [diff] [blame] | 759 | if (mask) |
| 760 | q->limits.max_segment_size = UINT_MAX; |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 761 | } |
| 762 | EXPORT_SYMBOL(blk_queue_virt_boundary); |
| 763 | |
| 764 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 765 | * blk_queue_dma_alignment - set dma length and memory alignment |
| 766 | * @q: the request queue for the device |
| 767 | * @mask: alignment mask |
| 768 | * |
| 769 | * description: |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 770 | * set required memory and length alignment for direct dma transactions. |
Alan Cox | 8feb4d2 | 2009-04-01 15:01:39 +0100 | [diff] [blame] | 771 | * this is used when building direct io requests for the queue. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 772 | * |
| 773 | **/ |
| 774 | void blk_queue_dma_alignment(struct request_queue *q, int mask) |
| 775 | { |
| 776 | q->dma_alignment = mask; |
| 777 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 778 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
| 779 | |
| 780 | /** |
| 781 | * blk_queue_update_dma_alignment - update dma length and memory alignment |
| 782 | * @q: the request queue for the device |
| 783 | * @mask: alignment mask |
| 784 | * |
| 785 | * description: |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 786 | * update required memory and length alignment for direct dma transactions. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 787 | * If the requested alignment is larger than the current alignment, then |
| 788 | * the current queue alignment is updated to the new value, otherwise it |
| 789 | * is left alone. The design of this is to allow multiple objects |
| 790 | * (driver, device, transport etc) to set their respective |
| 791 | * alignments without having them interfere. |
| 792 | * |
| 793 | **/ |
| 794 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) |
| 795 | { |
| 796 | BUG_ON(mask > PAGE_SIZE); |
| 797 | |
| 798 | if (mask > q->dma_alignment) |
| 799 | q->dma_alignment = mask; |
| 800 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 801 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
| 802 | |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 803 | /** |
Jens Axboe | d278d4a | 2016-03-30 10:21:08 -0600 | [diff] [blame] | 804 | * blk_set_queue_depth - tell the block layer about the device queue depth |
| 805 | * @q: the request queue for the device |
| 806 | * @depth: queue depth |
| 807 | * |
| 808 | */ |
| 809 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) |
| 810 | { |
| 811 | q->queue_depth = depth; |
Tejun Heo | 9677a3e | 2019-08-28 15:05:55 -0700 | [diff] [blame] | 812 | rq_qos_queue_depth_changed(q); |
Jens Axboe | d278d4a | 2016-03-30 10:21:08 -0600 | [diff] [blame] | 813 | } |
| 814 | EXPORT_SYMBOL(blk_set_queue_depth); |
| 815 | |
| 816 | /** |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 817 | * blk_queue_write_cache - configure queue's write cache |
| 818 | * @q: the request queue for the device |
| 819 | * @wc: write back cache on or off |
| 820 | * @fua: device supports FUA writes, if true |
| 821 | * |
| 822 | * Tell the block layer about the write cache of @q. |
| 823 | */ |
| 824 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) |
| 825 | { |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 826 | if (wc) |
Christoph Hellwig | 57d74df | 2018-11-14 17:02:07 +0100 | [diff] [blame] | 827 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 828 | else |
Christoph Hellwig | 57d74df | 2018-11-14 17:02:07 +0100 | [diff] [blame] | 829 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 830 | if (fua) |
Christoph Hellwig | 57d74df | 2018-11-14 17:02:07 +0100 | [diff] [blame] | 831 | blk_queue_flag_set(QUEUE_FLAG_FUA, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 832 | else |
Christoph Hellwig | 57d74df | 2018-11-14 17:02:07 +0100 | [diff] [blame] | 833 | blk_queue_flag_clear(QUEUE_FLAG_FUA, q); |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 834 | |
Josef Bacik | a790504 | 2018-07-03 09:32:35 -0600 | [diff] [blame] | 835 | wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 836 | } |
| 837 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); |
| 838 | |
Damien Le Moal | 68c43f1 | 2019-09-05 18:51:31 +0900 | [diff] [blame] | 839 | /** |
| 840 | * blk_queue_required_elevator_features - Set a queue required elevator features |
| 841 | * @q: the request queue for the target device |
| 842 | * @features: Required elevator features OR'ed together |
| 843 | * |
| 844 | * Tell the block layer that for the device controlled through @q, only the |
| 845 | * only elevators that can be used are those that implement at least the set of |
| 846 | * features specified by @features. |
| 847 | */ |
| 848 | void blk_queue_required_elevator_features(struct request_queue *q, |
| 849 | unsigned int features) |
| 850 | { |
| 851 | q->required_elevator_features = features; |
| 852 | } |
| 853 | EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); |
| 854 | |
Linus Torvalds | 671df18 | 2019-09-19 13:27:23 -0700 | [diff] [blame] | 855 | /** |
Yoshihiro Shimoda | 45147fb | 2019-08-28 21:35:42 +0900 | [diff] [blame] | 856 | * blk_queue_can_use_dma_map_merging - configure queue for merging segments. |
| 857 | * @q: the request queue for the device |
| 858 | * @dev: the device pointer for dma |
| 859 | * |
| 860 | * Tell the block layer about merging the segments by dma map of @q. |
| 861 | */ |
| 862 | bool blk_queue_can_use_dma_map_merging(struct request_queue *q, |
| 863 | struct device *dev) |
| 864 | { |
| 865 | unsigned long boundary = dma_get_merge_boundary(dev); |
| 866 | |
| 867 | if (!boundary) |
| 868 | return false; |
| 869 | |
| 870 | /* No need to update max_segment_size. see blk_queue_virt_boundary() */ |
| 871 | blk_queue_virt_boundary(q, boundary); |
| 872 | |
| 873 | return true; |
| 874 | } |
| 875 | EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); |
| 876 | |
Shin'ichiro Kawasaki | e0c60d0 | 2021-10-26 15:01:15 +0900 | [diff] [blame] | 877 | static bool disk_has_partitions(struct gendisk *disk) |
| 878 | { |
| 879 | unsigned long idx; |
| 880 | struct block_device *part; |
| 881 | bool ret = false; |
| 882 | |
| 883 | rcu_read_lock(); |
| 884 | xa_for_each(&disk->part_tbl, idx, part) { |
| 885 | if (bdev_is_partition(part)) { |
| 886 | ret = true; |
| 887 | break; |
| 888 | } |
| 889 | } |
| 890 | rcu_read_unlock(); |
| 891 | |
| 892 | return ret; |
| 893 | } |
| 894 | |
Damien Le Moal | 27ba3e8 | 2020-09-15 16:33:46 +0900 | [diff] [blame] | 895 | /** |
| 896 | * blk_queue_set_zoned - configure a disk queue zoned model. |
| 897 | * @disk: the gendisk of the queue to configure |
| 898 | * @model: the zoned model to set |
| 899 | * |
| 900 | * Set the zoned model of the request queue of @disk according to @model. |
| 901 | * When @model is BLK_ZONED_HM (host managed), this should be called only |
| 902 | * if zoned block device support is enabled (CONFIG_BLK_DEV_ZONED option). |
| 903 | * If @model specifies BLK_ZONED_HA (host aware), the effective model used |
| 904 | * depends on CONFIG_BLK_DEV_ZONED settings and on the existence of partitions |
| 905 | * on the disk. |
| 906 | */ |
| 907 | void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model) |
| 908 | { |
Damien Le Moal | a805a4f | 2021-01-28 13:47:30 +0900 | [diff] [blame] | 909 | struct request_queue *q = disk->queue; |
| 910 | |
Damien Le Moal | 27ba3e8 | 2020-09-15 16:33:46 +0900 | [diff] [blame] | 911 | switch (model) { |
| 912 | case BLK_ZONED_HM: |
| 913 | /* |
| 914 | * Host managed devices are supported only if |
| 915 | * CONFIG_BLK_DEV_ZONED is enabled. |
| 916 | */ |
| 917 | WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)); |
| 918 | break; |
| 919 | case BLK_ZONED_HA: |
| 920 | /* |
| 921 | * Host aware devices can be treated either as regular block |
| 922 | * devices (similar to drive managed devices) or as zoned block |
| 923 | * devices to take advantage of the zone command set, similarly |
| 924 | * to host managed devices. We try the latter if there are no |
| 925 | * partitions and zoned block device support is enabled, else |
| 926 | * we do nothing special as far as the block layer is concerned. |
| 927 | */ |
| 928 | if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) || |
Shin'ichiro Kawasaki | e0c60d0 | 2021-10-26 15:01:15 +0900 | [diff] [blame] | 929 | disk_has_partitions(disk)) |
Damien Le Moal | 27ba3e8 | 2020-09-15 16:33:46 +0900 | [diff] [blame] | 930 | model = BLK_ZONED_NONE; |
| 931 | break; |
| 932 | case BLK_ZONED_NONE: |
| 933 | default: |
| 934 | if (WARN_ON_ONCE(model != BLK_ZONED_NONE)) |
| 935 | model = BLK_ZONED_NONE; |
| 936 | break; |
| 937 | } |
| 938 | |
Damien Le Moal | a805a4f | 2021-01-28 13:47:30 +0900 | [diff] [blame] | 939 | q->limits.zoned = model; |
| 940 | if (model != BLK_ZONED_NONE) { |
| 941 | /* |
| 942 | * Set the zone write granularity to the device logical block |
| 943 | * size by default. The driver can change this value if needed. |
| 944 | */ |
| 945 | blk_queue_zone_write_granularity(q, |
| 946 | queue_logical_block_size(q)); |
Damien Le Moal | 508aebb | 2021-01-28 13:47:32 +0900 | [diff] [blame] | 947 | } else { |
| 948 | blk_queue_clear_zone_settings(q); |
Damien Le Moal | a805a4f | 2021-01-28 13:47:30 +0900 | [diff] [blame] | 949 | } |
Damien Le Moal | 27ba3e8 | 2020-09-15 16:33:46 +0900 | [diff] [blame] | 950 | } |
| 951 | EXPORT_SYMBOL_GPL(blk_queue_set_zoned); |
Christoph Hellwig | 89098b0 | 2022-04-15 06:52:49 +0200 | [diff] [blame] | 952 | |
| 953 | int bdev_alignment_offset(struct block_device *bdev) |
| 954 | { |
| 955 | struct request_queue *q = bdev_get_queue(bdev); |
| 956 | |
| 957 | if (q->limits.misaligned) |
| 958 | return -1; |
| 959 | if (bdev_is_partition(bdev)) |
| 960 | return queue_limit_alignment_offset(&q->limits, |
| 961 | bdev->bd_start_sect); |
| 962 | return q->limits.alignment_offset; |
| 963 | } |
| 964 | EXPORT_SYMBOL_GPL(bdev_alignment_offset); |
Christoph Hellwig | 5c4b4a5 | 2022-04-15 06:52:52 +0200 | [diff] [blame] | 965 | |
| 966 | unsigned int bdev_discard_alignment(struct block_device *bdev) |
| 967 | { |
| 968 | struct request_queue *q = bdev_get_queue(bdev); |
| 969 | |
| 970 | if (bdev_is_partition(bdev)) |
| 971 | return queue_limit_discard_alignment(&q->limits, |
| 972 | bdev->bd_start_sect); |
| 973 | return q->limits.discard_alignment; |
| 974 | } |
| 975 | EXPORT_SYMBOL_GPL(bdev_discard_alignment); |