Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Functions related to setting various queue properties from drivers |
| 3 | */ |
| 4 | #include <linux/kernel.h> |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/bio.h> |
| 8 | #include <linux/blkdev.h> |
| 9 | #include <linux/bootmem.h> /* for max_pfn/max_low_pfn */ |
Martin K. Petersen | 70dd5bf | 2009-07-31 11:49:12 -0400 | [diff] [blame] | 10 | #include <linux/gcd.h> |
Martin K. Petersen | 2cda272 | 2010-03-15 12:46:51 +0100 | [diff] [blame] | 11 | #include <linux/lcm.h> |
Randy Dunlap | ad5ebd2 | 2009-11-11 13:47:45 +0100 | [diff] [blame] | 12 | #include <linux/jiffies.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/gfp.h> |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 14 | |
| 15 | #include "blk.h" |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 16 | #include "blk-wbt.h" |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 17 | |
Jens Axboe | 6728cb0 | 2008-01-31 13:03:55 +0100 | [diff] [blame] | 18 | unsigned long blk_max_low_pfn; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 19 | EXPORT_SYMBOL(blk_max_low_pfn); |
Jens Axboe | 6728cb0 | 2008-01-31 13:03:55 +0100 | [diff] [blame] | 20 | |
| 21 | unsigned long blk_max_pfn; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 22 | |
| 23 | /** |
| 24 | * blk_queue_prep_rq - set a prepare_request function for queue |
| 25 | * @q: queue |
| 26 | * @pfn: prepare_request function |
| 27 | * |
| 28 | * It's possible for a queue to register a prepare_request callback which |
| 29 | * is invoked before the request is handed to the request_fn. The goal of |
| 30 | * the function is to prepare a request for I/O, it can be used to build a |
| 31 | * cdb from the request data for instance. |
| 32 | * |
| 33 | */ |
| 34 | void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn) |
| 35 | { |
| 36 | q->prep_rq_fn = pfn; |
| 37 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 38 | EXPORT_SYMBOL(blk_queue_prep_rq); |
| 39 | |
| 40 | /** |
James Bottomley | 28018c2 | 2010-07-01 19:49:17 +0900 | [diff] [blame] | 41 | * blk_queue_unprep_rq - set an unprepare_request function for queue |
| 42 | * @q: queue |
| 43 | * @ufn: unprepare_request function |
| 44 | * |
| 45 | * It's possible for a queue to register an unprepare_request callback |
| 46 | * which is invoked before the request is finally completed. The goal |
| 47 | * of the function is to deallocate any data that was allocated in the |
| 48 | * prepare_request callback. |
| 49 | * |
| 50 | */ |
| 51 | void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn) |
| 52 | { |
| 53 | q->unprep_rq_fn = ufn; |
| 54 | } |
| 55 | EXPORT_SYMBOL(blk_queue_unprep_rq); |
| 56 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 57 | void blk_queue_softirq_done(struct request_queue *q, softirq_done_fn *fn) |
| 58 | { |
| 59 | q->softirq_done_fn = fn; |
| 60 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 61 | EXPORT_SYMBOL(blk_queue_softirq_done); |
| 62 | |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 63 | void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) |
| 64 | { |
| 65 | q->rq_timeout = timeout; |
| 66 | } |
| 67 | EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); |
| 68 | |
| 69 | void blk_queue_rq_timed_out(struct request_queue *q, rq_timed_out_fn *fn) |
| 70 | { |
Bart Van Assche | 130d733 | 2017-08-23 10:56:29 -0700 | [diff] [blame] | 71 | WARN_ON_ONCE(q->mq_ops); |
Jens Axboe | 242f9dc | 2008-09-14 05:55:09 -0700 | [diff] [blame] | 72 | q->rq_timed_out_fn = fn; |
| 73 | } |
| 74 | EXPORT_SYMBOL_GPL(blk_queue_rq_timed_out); |
| 75 | |
Kiyoshi Ueda | ef9e3fa | 2008-10-01 16:12:15 +0200 | [diff] [blame] | 76 | void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn) |
| 77 | { |
| 78 | q->lld_busy_fn = fn; |
| 79 | } |
| 80 | EXPORT_SYMBOL_GPL(blk_queue_lld_busy); |
| 81 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 82 | /** |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 83 | * blk_set_default_limits - reset limits to default values |
Randy Dunlap | f740f5ca | 2009-06-19 09:18:32 +0200 | [diff] [blame] | 84 | * @lim: the queue_limits structure to reset |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 85 | * |
| 86 | * Description: |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 87 | * Returns a queue_limit struct to its default state. |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 88 | */ |
| 89 | void blk_set_default_limits(struct queue_limits *lim) |
| 90 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 91 | lim->max_segments = BLK_MAX_SEGMENTS; |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 92 | lim->max_discard_segments = 1; |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 93 | lim->max_integrity_segments = 0; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 94 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 95 | lim->virt_boundary_mask = 0; |
Martin K. Petersen | eb28d31 | 2010-02-26 00:20:37 -0500 | [diff] [blame] | 96 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
Keith Busch | 5f009d3 | 2016-02-10 16:52:47 -0700 | [diff] [blame] | 97 | lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; |
| 98 | lim->max_dev_sectors = 0; |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 99 | lim->chunk_sectors = 0; |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 100 | lim->max_write_same_sectors = 0; |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 101 | lim->max_write_zeroes_sectors = 0; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 102 | lim->max_discard_sectors = 0; |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 103 | lim->max_hw_discard_sectors = 0; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 104 | lim->discard_granularity = 0; |
| 105 | lim->discard_alignment = 0; |
| 106 | lim->discard_misaligned = 0; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 107 | lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; |
Martin K. Petersen | 3a02c8e | 2009-06-18 09:56:03 +0200 | [diff] [blame] | 108 | lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 109 | lim->alignment_offset = 0; |
| 110 | lim->io_opt = 0; |
| 111 | lim->misaligned = 0; |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 112 | lim->cluster = 1; |
Damien Le Moal | 797476b | 2016-10-18 15:40:29 +0900 | [diff] [blame] | 113 | lim->zoned = BLK_ZONED_NONE; |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 114 | } |
| 115 | EXPORT_SYMBOL(blk_set_default_limits); |
| 116 | |
| 117 | /** |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 118 | * blk_set_stacking_limits - set default limits for stacking devices |
| 119 | * @lim: the queue_limits structure to reset |
| 120 | * |
| 121 | * Description: |
| 122 | * Returns a queue_limit struct to its default state. Should be used |
| 123 | * by stacking drivers like DM that have no internal limits. |
| 124 | */ |
| 125 | void blk_set_stacking_limits(struct queue_limits *lim) |
| 126 | { |
| 127 | blk_set_default_limits(lim); |
| 128 | |
| 129 | /* Inherit limits from component devices */ |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 130 | lim->max_segments = USHRT_MAX; |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 131 | lim->max_discard_segments = 1; |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 132 | lim->max_hw_sectors = UINT_MAX; |
Mike Snitzer | d82ae52 | 2013-10-18 09:44:49 -0600 | [diff] [blame] | 133 | lim->max_segment_size = UINT_MAX; |
Mike Snitzer | fe86cdc | 2012-08-01 10:44:28 +0200 | [diff] [blame] | 134 | lim->max_sectors = UINT_MAX; |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 135 | lim->max_dev_sectors = UINT_MAX; |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 136 | lim->max_write_same_sectors = UINT_MAX; |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 137 | lim->max_write_zeroes_sectors = UINT_MAX; |
Martin K. Petersen | b1bd055 | 2012-01-11 16:27:11 +0100 | [diff] [blame] | 138 | } |
| 139 | EXPORT_SYMBOL(blk_set_stacking_limits); |
| 140 | |
| 141 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 142 | * blk_queue_make_request - define an alternate make_request function for a device |
| 143 | * @q: the request queue for the device to be affected |
| 144 | * @mfn: the alternate make_request function |
| 145 | * |
| 146 | * Description: |
| 147 | * The normal way for &struct bios to be passed to a device |
| 148 | * driver is for them to be collected into requests on a request |
| 149 | * queue, and then to allow the device driver to select requests |
| 150 | * off that queue when it is ready. This works well for many block |
| 151 | * devices. However some block devices (typically virtual devices |
| 152 | * such as md or lvm) do not benefit from the processing on the |
| 153 | * request queue, and are served best by having the requests passed |
| 154 | * directly to them. This can be achieved by providing a function |
| 155 | * to blk_queue_make_request(). |
| 156 | * |
| 157 | * Caveat: |
| 158 | * The driver that does this *must* be able to deal appropriately |
| 159 | * with buffers in "highmemory". This can be accomplished by either calling |
Christoph Hellwig | d004a5e7 | 2017-11-08 19:13:48 +0100 | [diff] [blame] | 160 | * kmap_atomic() to get a temporary kernel mapping, or by calling |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 161 | * blk_queue_bounce() to create a buffer in normal memory. |
| 162 | **/ |
Jens Axboe | 6728cb0 | 2008-01-31 13:03:55 +0100 | [diff] [blame] | 163 | void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 164 | { |
| 165 | /* |
| 166 | * set defaults |
| 167 | */ |
| 168 | q->nr_requests = BLKDEV_MAX_RQ; |
Milan Broz | 0e435ac | 2008-12-03 12:55:08 +0100 | [diff] [blame] | 169 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 170 | q->make_request_fn = mfn; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 171 | blk_queue_dma_alignment(q, 511); |
| 172 | blk_queue_congestion_threshold(q); |
| 173 | q->nr_batching = BLK_BATCH_REQ; |
| 174 | |
Martin K. Petersen | e475bba | 2009-06-16 08:23:52 +0200 | [diff] [blame] | 175 | blk_set_default_limits(&q->limits); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 176 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 177 | EXPORT_SYMBOL(blk_queue_make_request); |
| 178 | |
| 179 | /** |
| 180 | * blk_queue_bounce_limit - set bounce buffer limit for queue |
Tejun Heo | cd0aca2 | 2009-04-15 22:10:25 +0900 | [diff] [blame] | 181 | * @q: the request queue for the device |
Santosh Shilimkar | 9f7e45d | 2013-07-29 14:17:54 +0100 | [diff] [blame] | 182 | * @max_addr: the maximum address the device can handle |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 183 | * |
| 184 | * Description: |
| 185 | * Different hardware can have different requirements as to what pages |
| 186 | * it can do I/O directly to. A low level driver can call |
| 187 | * blk_queue_bounce_limit to have lower memory pages allocated as bounce |
Santosh Shilimkar | 9f7e45d | 2013-07-29 14:17:54 +0100 | [diff] [blame] | 188 | * buffers for doing I/O to pages residing above @max_addr. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 189 | **/ |
Santosh Shilimkar | 9f7e45d | 2013-07-29 14:17:54 +0100 | [diff] [blame] | 190 | void blk_queue_bounce_limit(struct request_queue *q, u64 max_addr) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 191 | { |
Santosh Shilimkar | 9f7e45d | 2013-07-29 14:17:54 +0100 | [diff] [blame] | 192 | unsigned long b_pfn = max_addr >> PAGE_SHIFT; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 193 | int dma = 0; |
| 194 | |
| 195 | q->bounce_gfp = GFP_NOIO; |
| 196 | #if BITS_PER_LONG == 64 |
Tejun Heo | cd0aca2 | 2009-04-15 22:10:25 +0900 | [diff] [blame] | 197 | /* |
| 198 | * Assume anything <= 4GB can be handled by IOMMU. Actually |
| 199 | * some IOMMUs can handle everything, but I don't know of a |
| 200 | * way to test this here. |
| 201 | */ |
| 202 | if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 203 | dma = 1; |
Malahal Naineni | efb012b | 2010-10-01 14:45:27 +0200 | [diff] [blame] | 204 | q->limits.bounce_pfn = max(max_low_pfn, b_pfn); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 205 | #else |
Jens Axboe | 6728cb0 | 2008-01-31 13:03:55 +0100 | [diff] [blame] | 206 | if (b_pfn < blk_max_low_pfn) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 207 | dma = 1; |
Malahal Naineni | c49825f | 2010-09-24 20:25:49 +0200 | [diff] [blame] | 208 | q->limits.bounce_pfn = b_pfn; |
Jens Axboe | 260a67a | 2010-10-01 14:42:43 +0200 | [diff] [blame] | 209 | #endif |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 210 | if (dma) { |
| 211 | init_emergency_isa_pool(); |
| 212 | q->bounce_gfp = GFP_NOIO | GFP_DMA; |
Jens Axboe | 260a67a | 2010-10-01 14:42:43 +0200 | [diff] [blame] | 213 | q->limits.bounce_pfn = b_pfn; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 214 | } |
| 215 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 216 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
| 217 | |
| 218 | /** |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 219 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
| 220 | * @q: the request queue for the device |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 221 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 222 | * |
| 223 | * Description: |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 224 | * Enables a low level driver to set a hard upper limit, |
| 225 | * 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] | 226 | * the device driver based upon the capabilities of the I/O |
| 227 | * controller. |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 228 | * |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 229 | * max_dev_sectors is a hard limit imposed by the storage device for |
| 230 | * READ/WRITE requests. It is set by the disk driver. |
| 231 | * |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 232 | * max_sectors is a soft limit imposed by the block layer for |
| 233 | * filesystem type requests. This value can be overridden on a |
| 234 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. |
| 235 | * The soft limit can not exceed max_hw_sectors. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 236 | **/ |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 237 | 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] | 238 | { |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 239 | struct queue_limits *limits = &q->limits; |
| 240 | unsigned int max_sectors; |
| 241 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 242 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
| 243 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 244 | printk(KERN_INFO "%s: set to minimum %d\n", |
Martin K. Petersen | 2800aac | 2010-02-26 00:20:35 -0500 | [diff] [blame] | 245 | __func__, max_hw_sectors); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 246 | } |
| 247 | |
Jeff Moyer | 30e2bc0 | 2015-08-13 14:57:56 -0400 | [diff] [blame] | 248 | limits->max_hw_sectors = max_hw_sectors; |
Martin K. Petersen | ca369d5 | 2015-11-13 16:46:48 -0500 | [diff] [blame] | 249 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
| 250 | max_sectors = min_t(unsigned int, max_sectors, BLK_DEF_MAX_SECTORS); |
| 251 | limits->max_sectors = max_sectors; |
Jan Kara | dc3b17c | 2017-02-02 15:56:50 +0100 | [diff] [blame] | 252 | q->backing_dev_info->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 253 | } |
Martin K. Petersen | 086fa5f | 2010-02-26 00:20:38 -0500 | [diff] [blame] | 254 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 255 | |
| 256 | /** |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 257 | * blk_queue_chunk_sectors - set size of the chunk for this queue |
| 258 | * @q: the request queue for the device |
| 259 | * @chunk_sectors: chunk sectors in the usual 512b unit |
| 260 | * |
| 261 | * Description: |
| 262 | * If a driver doesn't want IOs to cross a given chunk size, it can set |
| 263 | * this limit and prevent merging across chunks. Note that the chunk size |
Jens Axboe | 58a4915 | 2014-06-10 12:53:56 -0600 | [diff] [blame] | 264 | * must currently be a power-of-2 in sectors. Also note that the block |
| 265 | * layer must accept a page worth of data at any offset. So if the |
| 266 | * crossing of chunks is a hard limitation in the driver, it must still be |
| 267 | * prepared to split single page bios. |
Jens Axboe | 762380a | 2014-06-05 13:38:39 -0600 | [diff] [blame] | 268 | **/ |
| 269 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) |
| 270 | { |
| 271 | BUG_ON(!is_power_of_2(chunk_sectors)); |
| 272 | q->limits.chunk_sectors = chunk_sectors; |
| 273 | } |
| 274 | EXPORT_SYMBOL(blk_queue_chunk_sectors); |
| 275 | |
| 276 | /** |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 277 | * blk_queue_max_discard_sectors - set max sectors for a single discard |
| 278 | * @q: the request queue for the device |
Randy Dunlap | c7ebf06 | 2009-10-12 08:20:47 +0200 | [diff] [blame] | 279 | * @max_discard_sectors: maximum number of sectors to discard |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 280 | **/ |
| 281 | void blk_queue_max_discard_sectors(struct request_queue *q, |
| 282 | unsigned int max_discard_sectors) |
| 283 | { |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 284 | q->limits.max_hw_discard_sectors = max_discard_sectors; |
Christoph Hellwig | 67efc92 | 2009-09-30 13:54:20 +0200 | [diff] [blame] | 285 | q->limits.max_discard_sectors = max_discard_sectors; |
| 286 | } |
| 287 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); |
| 288 | |
| 289 | /** |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 290 | * blk_queue_max_write_same_sectors - set max sectors for a single write same |
| 291 | * @q: the request queue for the device |
| 292 | * @max_write_same_sectors: maximum number of sectors to write per command |
| 293 | **/ |
| 294 | void blk_queue_max_write_same_sectors(struct request_queue *q, |
| 295 | unsigned int max_write_same_sectors) |
| 296 | { |
| 297 | q->limits.max_write_same_sectors = max_write_same_sectors; |
| 298 | } |
| 299 | EXPORT_SYMBOL(blk_queue_max_write_same_sectors); |
| 300 | |
| 301 | /** |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 302 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single |
| 303 | * write zeroes |
| 304 | * @q: the request queue for the device |
| 305 | * @max_write_zeroes_sectors: maximum number of sectors to write per command |
| 306 | **/ |
| 307 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
| 308 | unsigned int max_write_zeroes_sectors) |
| 309 | { |
| 310 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; |
| 311 | } |
| 312 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); |
| 313 | |
| 314 | /** |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 315 | * 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] | 316 | * @q: the request queue for the device |
| 317 | * @max_segments: max number of segments |
| 318 | * |
| 319 | * Description: |
| 320 | * 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] | 321 | * hw data segments in a request. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 322 | **/ |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 323 | 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] | 324 | { |
| 325 | if (!max_segments) { |
| 326 | max_segments = 1; |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 327 | printk(KERN_INFO "%s: set to minimum %d\n", |
| 328 | __func__, max_segments); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 329 | } |
| 330 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 331 | q->limits.max_segments = max_segments; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 332 | } |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 333 | EXPORT_SYMBOL(blk_queue_max_segments); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 334 | |
| 335 | /** |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 336 | * blk_queue_max_discard_segments - set max segments for discard requests |
| 337 | * @q: the request queue for the device |
| 338 | * @max_segments: max number of segments |
| 339 | * |
| 340 | * Description: |
| 341 | * Enables a low level driver to set an upper limit on the number of |
| 342 | * segments in a discard request. |
| 343 | **/ |
| 344 | void blk_queue_max_discard_segments(struct request_queue *q, |
| 345 | unsigned short max_segments) |
| 346 | { |
| 347 | q->limits.max_discard_segments = max_segments; |
| 348 | } |
| 349 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); |
| 350 | |
| 351 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 352 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg |
| 353 | * @q: the request queue for the device |
| 354 | * @max_size: max size of segment in bytes |
| 355 | * |
| 356 | * Description: |
| 357 | * Enables a low level driver to set an upper limit on the size of a |
| 358 | * coalesced segment |
| 359 | **/ |
| 360 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) |
| 361 | { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 362 | if (max_size < PAGE_SIZE) { |
| 363 | max_size = PAGE_SIZE; |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 364 | printk(KERN_INFO "%s: set to minimum %d\n", |
| 365 | __func__, max_size); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 366 | } |
| 367 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 368 | q->limits.max_segment_size = max_size; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 369 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 370 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
| 371 | |
| 372 | /** |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 373 | * blk_queue_logical_block_size - set logical block size for the queue |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 374 | * @q: the request queue for the device |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 375 | * @size: the logical block size, in bytes |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 376 | * |
| 377 | * Description: |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 378 | * This should be set to the lowest possible block size that the |
| 379 | * storage device can address. The default of 512 covers most |
| 380 | * hardware. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 381 | **/ |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 382 | void blk_queue_logical_block_size(struct request_queue *q, unsigned short size) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 383 | { |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 384 | q->limits.logical_block_size = size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 385 | |
| 386 | if (q->limits.physical_block_size < size) |
| 387 | q->limits.physical_block_size = size; |
| 388 | |
| 389 | if (q->limits.io_min < q->limits.physical_block_size) |
| 390 | q->limits.io_min = q->limits.physical_block_size; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 391 | } |
Martin K. Petersen | e1defc4 | 2009-05-22 17:17:49 -0400 | [diff] [blame] | 392 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 393 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 394 | /** |
| 395 | * blk_queue_physical_block_size - set physical block size for the queue |
| 396 | * @q: the request queue for the device |
| 397 | * @size: the physical block size, in bytes |
| 398 | * |
| 399 | * Description: |
| 400 | * This should be set to the lowest possible sector size that the |
| 401 | * hardware can operate on without reverting to read-modify-write |
| 402 | * operations. |
| 403 | */ |
Martin K. Petersen | 892b6f9 | 2010-10-13 21:18:03 +0200 | [diff] [blame] | 404 | 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] | 405 | { |
| 406 | q->limits.physical_block_size = size; |
| 407 | |
| 408 | if (q->limits.physical_block_size < q->limits.logical_block_size) |
| 409 | q->limits.physical_block_size = q->limits.logical_block_size; |
| 410 | |
| 411 | if (q->limits.io_min < q->limits.physical_block_size) |
| 412 | q->limits.io_min = q->limits.physical_block_size; |
| 413 | } |
| 414 | EXPORT_SYMBOL(blk_queue_physical_block_size); |
| 415 | |
| 416 | /** |
| 417 | * blk_queue_alignment_offset - set physical block alignment offset |
| 418 | * @q: the request queue for the device |
Randy Dunlap | 8ebf975 | 2009-06-11 20:00:41 -0700 | [diff] [blame] | 419 | * @offset: alignment offset in bytes |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 420 | * |
| 421 | * Description: |
| 422 | * Some devices are naturally misaligned to compensate for things like |
| 423 | * the legacy DOS partition table 63-sector offset. Low-level drivers |
| 424 | * should call this function for devices whose first sector is not |
| 425 | * naturally aligned. |
| 426 | */ |
| 427 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) |
| 428 | { |
| 429 | q->limits.alignment_offset = |
| 430 | offset & (q->limits.physical_block_size - 1); |
| 431 | q->limits.misaligned = 0; |
| 432 | } |
| 433 | EXPORT_SYMBOL(blk_queue_alignment_offset); |
| 434 | |
| 435 | /** |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 436 | * blk_limits_io_min - set minimum request size for a device |
| 437 | * @limits: the queue limits |
| 438 | * @min: smallest I/O size in bytes |
| 439 | * |
| 440 | * Description: |
| 441 | * Some devices have an internal block size bigger than the reported |
| 442 | * hardware sector size. This function can be used to signal the |
| 443 | * smallest I/O the device can perform without incurring a performance |
| 444 | * penalty. |
| 445 | */ |
| 446 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) |
| 447 | { |
| 448 | limits->io_min = min; |
| 449 | |
| 450 | if (limits->io_min < limits->logical_block_size) |
| 451 | limits->io_min = limits->logical_block_size; |
| 452 | |
| 453 | if (limits->io_min < limits->physical_block_size) |
| 454 | limits->io_min = limits->physical_block_size; |
| 455 | } |
| 456 | EXPORT_SYMBOL(blk_limits_io_min); |
| 457 | |
| 458 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 459 | * blk_queue_io_min - set minimum request size for the queue |
| 460 | * @q: the request queue for the device |
Randy Dunlap | 8ebf975 | 2009-06-11 20:00:41 -0700 | [diff] [blame] | 461 | * @min: smallest I/O size in bytes |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 462 | * |
| 463 | * Description: |
Martin K. Petersen | 7e5f5fb | 2009-07-31 11:49:13 -0400 | [diff] [blame] | 464 | * Storage devices may report a granularity or preferred minimum I/O |
| 465 | * size which is the smallest request the device can perform without |
| 466 | * incurring a performance penalty. For disk drives this is often the |
| 467 | * physical block size. For RAID arrays it is often the stripe chunk |
| 468 | * size. A properly aligned multiple of minimum_io_size is the |
| 469 | * preferred request size for workloads where a high number of I/O |
| 470 | * operations is desired. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 471 | */ |
| 472 | void blk_queue_io_min(struct request_queue *q, unsigned int min) |
| 473 | { |
Martin K. Petersen | 7c958e3 | 2009-07-31 11:49:11 -0400 | [diff] [blame] | 474 | blk_limits_io_min(&q->limits, min); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 475 | } |
| 476 | EXPORT_SYMBOL(blk_queue_io_min); |
| 477 | |
| 478 | /** |
Martin K. Petersen | 3c5820c | 2009-09-11 21:54:52 +0200 | [diff] [blame] | 479 | * blk_limits_io_opt - set optimal request size for a device |
| 480 | * @limits: the queue limits |
| 481 | * @opt: smallest I/O size in bytes |
| 482 | * |
| 483 | * Description: |
| 484 | * Storage devices may report an optimal I/O size, which is the |
| 485 | * device's preferred unit for sustained I/O. This is rarely reported |
| 486 | * for disk drives. For RAID arrays it is usually the stripe width or |
| 487 | * the internal track size. A properly aligned multiple of |
| 488 | * optimal_io_size is the preferred request size for workloads where |
| 489 | * sustained throughput is desired. |
| 490 | */ |
| 491 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) |
| 492 | { |
| 493 | limits->io_opt = opt; |
| 494 | } |
| 495 | EXPORT_SYMBOL(blk_limits_io_opt); |
| 496 | |
| 497 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 498 | * blk_queue_io_opt - set optimal request size for the queue |
| 499 | * @q: the request queue for the device |
Randy Dunlap | 8ebf975 | 2009-06-11 20:00:41 -0700 | [diff] [blame] | 500 | * @opt: optimal request size in bytes |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 501 | * |
| 502 | * Description: |
Martin K. Petersen | 7e5f5fb | 2009-07-31 11:49:13 -0400 | [diff] [blame] | 503 | * Storage devices may report an optimal I/O size, which is the |
| 504 | * device's preferred unit for sustained I/O. This is rarely reported |
| 505 | * for disk drives. For RAID arrays it is usually the stripe width or |
| 506 | * the internal track size. A properly aligned multiple of |
| 507 | * optimal_io_size is the preferred request size for workloads where |
| 508 | * sustained throughput is desired. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 509 | */ |
| 510 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) |
| 511 | { |
Martin K. Petersen | 3c5820c | 2009-09-11 21:54:52 +0200 | [diff] [blame] | 512 | blk_limits_io_opt(&q->limits, opt); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 513 | } |
| 514 | EXPORT_SYMBOL(blk_queue_io_opt); |
| 515 | |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 516 | /** |
| 517 | * blk_queue_stack_limits - inherit underlying queue limits for stacked drivers |
| 518 | * @t: the stacking driver (top) |
| 519 | * @b: the underlying device (bottom) |
| 520 | **/ |
| 521 | void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b) |
| 522 | { |
Martin K. Petersen | fef2466 | 2009-07-31 11:49:10 -0400 | [diff] [blame] | 523 | blk_stack_limits(&t->limits, &b->limits, 0); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 524 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 525 | EXPORT_SYMBOL(blk_queue_stack_limits); |
| 526 | |
| 527 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 528 | * blk_stack_limits - adjust queue_limits for stacked devices |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 529 | * @t: the stacking driver limits (top device) |
| 530 | * @b: the underlying queue limits (bottom, component device) |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 531 | * @start: first data sector within component device |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 532 | * |
| 533 | * Description: |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 534 | * This function is used by stacking drivers like MD and DM to ensure |
| 535 | * that all component devices have compatible block sizes and |
| 536 | * alignments. The stacking driver must provide a queue_limits |
| 537 | * struct (top) and then iteratively call the stacking function for |
| 538 | * all component (bottom) devices. The stacking function will |
| 539 | * attempt to combine the values and ensure proper alignment. |
| 540 | * |
| 541 | * Returns 0 if the top and bottom queue_limits are compatible. The |
| 542 | * top device's block sizes and alignment offsets may be adjusted to |
| 543 | * ensure alignment with the bottom device. If no compatible sizes |
| 544 | * and alignments exist, -1 is returned and the resulting top |
| 545 | * queue_limits will have the misaligned flag set to indicate that |
| 546 | * the alignment_offset is undefined. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 547 | */ |
| 548 | 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] | 549 | sector_t start) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 550 | { |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 551 | unsigned int top, bottom, alignment, ret = 0; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 552 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 553 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
| 554 | 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] | 555 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
Martin K. Petersen | 4363ac7 | 2012-09-18 12:19:27 -0400 | [diff] [blame] | 556 | t->max_write_same_sectors = min(t->max_write_same_sectors, |
| 557 | b->max_write_same_sectors); |
Chaitanya Kulkarni | a6f0788 | 2016-11-30 12:28:59 -0800 | [diff] [blame] | 558 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
| 559 | b->max_write_zeroes_sectors); |
Martin K. Petersen | 77634f3 | 2009-06-09 06:23:22 +0200 | [diff] [blame] | 560 | t->bounce_pfn = min_not_zero(t->bounce_pfn, b->bounce_pfn); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 561 | |
| 562 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, |
| 563 | b->seg_boundary_mask); |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 564 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
| 565 | b->virt_boundary_mask); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 566 | |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 567 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
Christoph Hellwig | 1e73973 | 2017-02-08 14:46:49 +0100 | [diff] [blame] | 568 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
| 569 | b->max_discard_segments); |
Martin K. Petersen | 13f05c8 | 2010-09-10 20:50:10 +0200 | [diff] [blame] | 570 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
| 571 | b->max_integrity_segments); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 572 | |
| 573 | t->max_segment_size = min_not_zero(t->max_segment_size, |
| 574 | b->max_segment_size); |
| 575 | |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 576 | t->misaligned |= b->misaligned; |
| 577 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 578 | alignment = queue_limit_alignment_offset(b, start); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 579 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 580 | /* Bottom device has different alignment. Check that it is |
| 581 | * compatible with the current top alignment. |
| 582 | */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 583 | if (t->alignment_offset != alignment) { |
| 584 | |
| 585 | top = max(t->physical_block_size, t->io_min) |
| 586 | + t->alignment_offset; |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 587 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 588 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 589 | /* Verify that top and bottom intervals line up */ |
Mike Snitzer | b8839b8 | 2014-10-08 18:26:13 -0400 | [diff] [blame] | 590 | if (max(top, bottom) % min(top, bottom)) { |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 591 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 592 | ret = -1; |
| 593 | } |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 594 | } |
| 595 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 596 | t->logical_block_size = max(t->logical_block_size, |
| 597 | b->logical_block_size); |
| 598 | |
| 599 | t->physical_block_size = max(t->physical_block_size, |
| 600 | b->physical_block_size); |
| 601 | |
| 602 | t->io_min = max(t->io_min, b->io_min); |
Mike Snitzer | e963741 | 2015-03-30 13:39:09 -0400 | [diff] [blame] | 603 | t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 604 | |
Martin K. Petersen | e692cb6 | 2010-12-01 19:41:49 +0100 | [diff] [blame] | 605 | t->cluster &= b->cluster; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 606 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 607 | /* Physical block size a multiple of the logical block size? */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 608 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
| 609 | t->physical_block_size = t->logical_block_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 610 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 611 | ret = -1; |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 612 | } |
| 613 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 614 | /* Minimum I/O a multiple of the physical block size? */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 615 | if (t->io_min & (t->physical_block_size - 1)) { |
| 616 | t->io_min = t->physical_block_size; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 617 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 618 | ret = -1; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 619 | } |
| 620 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 621 | /* Optimal I/O a multiple of the physical block size? */ |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 622 | if (t->io_opt & (t->physical_block_size - 1)) { |
| 623 | t->io_opt = 0; |
| 624 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 625 | ret = -1; |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 626 | } |
Martin K. Petersen | 70dd5bf | 2009-07-31 11:49:12 -0400 | [diff] [blame] | 627 | |
Kent Overstreet | c78afc6 | 2013-07-11 22:39:53 -0700 | [diff] [blame] | 628 | t->raid_partial_stripes_expensive = |
| 629 | max(t->raid_partial_stripes_expensive, |
| 630 | b->raid_partial_stripes_expensive); |
| 631 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 632 | /* Find lowest common alignment_offset */ |
Mike Snitzer | e963741 | 2015-03-30 13:39:09 -0400 | [diff] [blame] | 633 | t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) |
Mike Snitzer | b8839b8 | 2014-10-08 18:26:13 -0400 | [diff] [blame] | 634 | % max(t->physical_block_size, t->io_min); |
Martin K. Petersen | 70dd5bf | 2009-07-31 11:49:12 -0400 | [diff] [blame] | 635 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 636 | /* Verify that new alignment_offset is on a logical block boundary */ |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 637 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 638 | t->misaligned = 1; |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 639 | ret = -1; |
| 640 | } |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 641 | |
| 642 | /* Discard alignment and granularity */ |
| 643 | if (b->discard_granularity) { |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 644 | alignment = queue_limit_discard_alignment(b, start); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 645 | |
| 646 | if (t->discard_granularity != 0 && |
| 647 | t->discard_alignment != alignment) { |
| 648 | top = t->discard_granularity + t->discard_alignment; |
| 649 | bottom = b->discard_granularity + alignment; |
| 650 | |
| 651 | /* Verify that top and bottom intervals line up */ |
Shaohua Li | 8dd2cb7 | 2012-12-14 11:15:36 +0800 | [diff] [blame] | 652 | if ((max(top, bottom) % min(top, bottom)) != 0) |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 653 | t->discard_misaligned = 1; |
| 654 | } |
| 655 | |
Martin K. Petersen | 81744ee | 2009-12-29 08:35:35 +0100 | [diff] [blame] | 656 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
| 657 | b->max_discard_sectors); |
Jens Axboe | 0034af0 | 2015-07-16 09:14:26 -0600 | [diff] [blame] | 658 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
| 659 | b->max_hw_discard_sectors); |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 660 | t->discard_granularity = max(t->discard_granularity, |
| 661 | b->discard_granularity); |
Mike Snitzer | e963741 | 2015-03-30 13:39:09 -0400 | [diff] [blame] | 662 | t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % |
Shaohua Li | 8dd2cb7 | 2012-12-14 11:15:36 +0800 | [diff] [blame] | 663 | t->discard_granularity; |
Martin K. Petersen | 9504e08 | 2009-12-21 15:55:51 +0100 | [diff] [blame] | 664 | } |
| 665 | |
Hannes Reinecke | 987b3b2 | 2016-10-18 15:40:31 +0900 | [diff] [blame] | 666 | if (b->chunk_sectors) |
| 667 | t->chunk_sectors = min_not_zero(t->chunk_sectors, |
| 668 | b->chunk_sectors); |
| 669 | |
Martin K. Petersen | fe0b393 | 2010-01-11 03:21:47 -0500 | [diff] [blame] | 670 | return ret; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 671 | } |
Mike Snitzer | 5d85d32 | 2009-05-28 11:04:53 +0200 | [diff] [blame] | 672 | EXPORT_SYMBOL(blk_stack_limits); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 673 | |
| 674 | /** |
Martin K. Petersen | 17be8c2 | 2010-01-11 03:21:49 -0500 | [diff] [blame] | 675 | * bdev_stack_limits - adjust queue limits for stacked drivers |
| 676 | * @t: the stacking driver limits (top device) |
| 677 | * @bdev: the component block_device (bottom) |
| 678 | * @start: first data sector within component device |
| 679 | * |
| 680 | * Description: |
| 681 | * Merges queue limits for a top device and a block_device. Returns |
| 682 | * 0 if alignment didn't change. Returns -1 if adding the bottom |
| 683 | * device caused misalignment. |
| 684 | */ |
| 685 | int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
| 686 | sector_t start) |
| 687 | { |
| 688 | struct request_queue *bq = bdev_get_queue(bdev); |
| 689 | |
| 690 | start += get_start_sect(bdev); |
| 691 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 692 | return blk_stack_limits(t, &bq->limits, start); |
Martin K. Petersen | 17be8c2 | 2010-01-11 03:21:49 -0500 | [diff] [blame] | 693 | } |
| 694 | EXPORT_SYMBOL(bdev_stack_limits); |
| 695 | |
| 696 | /** |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 697 | * disk_stack_limits - adjust queue limits for stacked drivers |
Martin K. Petersen | 77634f3 | 2009-06-09 06:23:22 +0200 | [diff] [blame] | 698 | * @disk: MD/DM gendisk (top) |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 699 | * @bdev: the underlying block device (bottom) |
| 700 | * @offset: offset to beginning of data within component device |
| 701 | * |
| 702 | * Description: |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 703 | * Merges the limits for a top level gendisk and a bottom level |
| 704 | * block_device. |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 705 | */ |
| 706 | void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
| 707 | sector_t offset) |
| 708 | { |
| 709 | struct request_queue *t = disk->queue; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 710 | |
Martin K. Petersen | e03a72e | 2010-01-11 03:21:51 -0500 | [diff] [blame] | 711 | if (bdev_stack_limits(&t->limits, bdev, offset >> 9) < 0) { |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 712 | char top[BDEVNAME_SIZE], bottom[BDEVNAME_SIZE]; |
| 713 | |
| 714 | disk_name(disk, 0, top); |
| 715 | bdevname(bdev, bottom); |
| 716 | |
| 717 | printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n", |
| 718 | top, bottom); |
| 719 | } |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 720 | } |
| 721 | EXPORT_SYMBOL(disk_stack_limits); |
| 722 | |
| 723 | /** |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 724 | * blk_queue_dma_pad - set pad mask |
| 725 | * @q: the request queue for the device |
| 726 | * @mask: pad mask |
| 727 | * |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 728 | * Set dma pad mask. |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 729 | * |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 730 | * Appending pad buffer to a request modifies the last entry of a |
| 731 | * scatter list such that it includes the pad buffer. |
Tejun Heo | e3790c7 | 2008-03-04 11:18:17 +0100 | [diff] [blame] | 732 | **/ |
| 733 | void blk_queue_dma_pad(struct request_queue *q, unsigned int mask) |
| 734 | { |
| 735 | q->dma_pad_mask = mask; |
| 736 | } |
| 737 | EXPORT_SYMBOL(blk_queue_dma_pad); |
| 738 | |
| 739 | /** |
FUJITA Tomonori | 27f8221 | 2008-07-04 09:30:03 +0200 | [diff] [blame] | 740 | * blk_queue_update_dma_pad - update pad mask |
| 741 | * @q: the request queue for the device |
| 742 | * @mask: pad mask |
| 743 | * |
| 744 | * Update dma pad mask. |
| 745 | * |
| 746 | * Appending pad buffer to a request modifies the last entry of a |
| 747 | * scatter list such that it includes the pad buffer. |
| 748 | **/ |
| 749 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) |
| 750 | { |
| 751 | if (mask > q->dma_pad_mask) |
| 752 | q->dma_pad_mask = mask; |
| 753 | } |
| 754 | EXPORT_SYMBOL(blk_queue_update_dma_pad); |
| 755 | |
| 756 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 757 | * blk_queue_dma_drain - Set up a drain buffer for excess dma. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 758 | * @q: the request queue for the device |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 759 | * @dma_drain_needed: fn which returns non-zero if drain is necessary |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 760 | * @buf: physically contiguous buffer |
| 761 | * @size: size of the buffer in bytes |
| 762 | * |
| 763 | * Some devices have excess DMA problems and can't simply discard (or |
| 764 | * zero fill) the unwanted piece of the transfer. They have to have a |
| 765 | * real area of memory to transfer it into. The use case for this is |
| 766 | * ATAPI devices in DMA mode. If the packet command causes a transfer |
| 767 | * bigger than the transfer size some HBAs will lock up if there |
| 768 | * aren't DMA elements to contain the excess transfer. What this API |
| 769 | * does is adjust the queue so that the buf is always appended |
| 770 | * silently to the scatterlist. |
| 771 | * |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 772 | * Note: This routine adjusts max_hw_segments to make room for appending |
| 773 | * the drain buffer. If you call blk_queue_max_segments() after calling |
| 774 | * this routine, you must set the limit to one fewer than your device |
| 775 | * can support otherwise there won't be room for the drain buffer. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 776 | */ |
Harvey Harrison | 448da4d | 2008-03-04 11:30:18 +0100 | [diff] [blame] | 777 | int blk_queue_dma_drain(struct request_queue *q, |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 778 | dma_drain_needed_fn *dma_drain_needed, |
| 779 | void *buf, unsigned int size) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 780 | { |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 781 | if (queue_max_segments(q) < 2) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 782 | return -EINVAL; |
| 783 | /* make room for appending the drain */ |
Martin K. Petersen | 8a78362 | 2010-02-26 00:20:39 -0500 | [diff] [blame] | 784 | blk_queue_max_segments(q, queue_max_segments(q) - 1); |
Tejun Heo | 2fb98e8 | 2008-02-19 11:36:53 +0100 | [diff] [blame] | 785 | q->dma_drain_needed = dma_drain_needed; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 786 | q->dma_drain_buffer = buf; |
| 787 | q->dma_drain_size = size; |
| 788 | |
| 789 | return 0; |
| 790 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 791 | EXPORT_SYMBOL_GPL(blk_queue_dma_drain); |
| 792 | |
| 793 | /** |
| 794 | * blk_queue_segment_boundary - set boundary rules for segment merging |
| 795 | * @q: the request queue for the device |
| 796 | * @mask: the memory boundary mask |
| 797 | **/ |
| 798 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) |
| 799 | { |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 800 | if (mask < PAGE_SIZE - 1) { |
| 801 | mask = PAGE_SIZE - 1; |
Harvey Harrison | 24c03d4 | 2008-05-01 04:35:17 -0700 | [diff] [blame] | 802 | printk(KERN_INFO "%s: set to minimum %lx\n", |
| 803 | __func__, mask); |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 804 | } |
| 805 | |
Martin K. Petersen | 025146e | 2009-05-22 17:17:51 -0400 | [diff] [blame] | 806 | q->limits.seg_boundary_mask = mask; |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 807 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 808 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
| 809 | |
| 810 | /** |
Keith Busch | 03100aa | 2015-08-19 14:24:05 -0700 | [diff] [blame] | 811 | * blk_queue_virt_boundary - set boundary rules for bio merging |
| 812 | * @q: the request queue for the device |
| 813 | * @mask: the memory boundary mask |
| 814 | **/ |
| 815 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) |
| 816 | { |
| 817 | q->limits.virt_boundary_mask = mask; |
| 818 | } |
| 819 | EXPORT_SYMBOL(blk_queue_virt_boundary); |
| 820 | |
| 821 | /** |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 822 | * blk_queue_dma_alignment - set dma length and memory alignment |
| 823 | * @q: the request queue for the device |
| 824 | * @mask: alignment mask |
| 825 | * |
| 826 | * description: |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 827 | * set required memory and length alignment for direct dma transactions. |
Alan Cox | 8feb4d2 | 2009-04-01 15:01:39 +0100 | [diff] [blame] | 828 | * this is used when building direct io requests for the queue. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 829 | * |
| 830 | **/ |
| 831 | void blk_queue_dma_alignment(struct request_queue *q, int mask) |
| 832 | { |
| 833 | q->dma_alignment = mask; |
| 834 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 835 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
| 836 | |
| 837 | /** |
| 838 | * blk_queue_update_dma_alignment - update dma length and memory alignment |
| 839 | * @q: the request queue for the device |
| 840 | * @mask: alignment mask |
| 841 | * |
| 842 | * description: |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 843 | * update required memory and length alignment for direct dma transactions. |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 844 | * If the requested alignment is larger than the current alignment, then |
| 845 | * the current queue alignment is updated to the new value, otherwise it |
| 846 | * is left alone. The design of this is to allow multiple objects |
| 847 | * (driver, device, transport etc) to set their respective |
| 848 | * alignments without having them interfere. |
| 849 | * |
| 850 | **/ |
| 851 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) |
| 852 | { |
| 853 | BUG_ON(mask > PAGE_SIZE); |
| 854 | |
| 855 | if (mask > q->dma_alignment) |
| 856 | q->dma_alignment = mask; |
| 857 | } |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 858 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
| 859 | |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 860 | void blk_queue_flush_queueable(struct request_queue *q, bool queueable) |
| 861 | { |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 862 | if (queueable) |
Bart Van Assche | 8814ce8 | 2018-03-07 17:10:04 -0800 | [diff] [blame] | 863 | blk_queue_flag_clear(QUEUE_FLAG_FLUSH_NQ, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 864 | else |
Bart Van Assche | 8814ce8 | 2018-03-07 17:10:04 -0800 | [diff] [blame] | 865 | blk_queue_flag_set(QUEUE_FLAG_FLUSH_NQ, q); |
shaohua.li@intel.com | f387693 | 2011-05-06 11:34:32 -0600 | [diff] [blame] | 866 | } |
| 867 | EXPORT_SYMBOL_GPL(blk_queue_flush_queueable); |
| 868 | |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 869 | /** |
Jens Axboe | d278d4a | 2016-03-30 10:21:08 -0600 | [diff] [blame] | 870 | * blk_set_queue_depth - tell the block layer about the device queue depth |
| 871 | * @q: the request queue for the device |
| 872 | * @depth: queue depth |
| 873 | * |
| 874 | */ |
| 875 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) |
| 876 | { |
| 877 | q->queue_depth = depth; |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 878 | wbt_set_queue_depth(q->rq_wb, depth); |
Jens Axboe | d278d4a | 2016-03-30 10:21:08 -0600 | [diff] [blame] | 879 | } |
| 880 | EXPORT_SYMBOL(blk_set_queue_depth); |
| 881 | |
| 882 | /** |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 883 | * blk_queue_write_cache - configure queue's write cache |
| 884 | * @q: the request queue for the device |
| 885 | * @wc: write back cache on or off |
| 886 | * @fua: device supports FUA writes, if true |
| 887 | * |
| 888 | * Tell the block layer about the write cache of @q. |
| 889 | */ |
| 890 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) |
| 891 | { |
| 892 | spin_lock_irq(q->queue_lock); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 893 | if (wc) |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 894 | queue_flag_set(QUEUE_FLAG_WC, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 895 | else |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 896 | queue_flag_clear(QUEUE_FLAG_WC, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 897 | if (fua) |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 898 | queue_flag_set(QUEUE_FLAG_FUA, q); |
Jens Axboe | c888a8f | 2016-04-13 13:33:19 -0600 | [diff] [blame] | 899 | else |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 900 | queue_flag_clear(QUEUE_FLAG_FUA, q); |
| 901 | spin_unlock_irq(q->queue_lock); |
Jens Axboe | 87760e5 | 2016-11-09 12:38:14 -0700 | [diff] [blame] | 902 | |
| 903 | wbt_set_write_cache(q->rq_wb, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); |
Jens Axboe | 93e9d8e | 2016-04-12 12:32:46 -0600 | [diff] [blame] | 904 | } |
| 905 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); |
| 906 | |
Harvey Harrison | aeb3d3a | 2008-08-28 09:27:42 +0200 | [diff] [blame] | 907 | static int __init blk_settings_init(void) |
Jens Axboe | 86db1e2 | 2008-01-29 14:53:40 +0100 | [diff] [blame] | 908 | { |
| 909 | blk_max_low_pfn = max_low_pfn - 1; |
| 910 | blk_max_pfn = max_pfn - 1; |
| 911 | return 0; |
| 912 | } |
| 913 | subsys_initcall(blk_settings_init); |