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1// SPDX-License-Identifier: GPL-2.02/*3 * Functions related to setting various queue properties from drivers4 */5#include <linux/kernel.h>6#include <linux/module.h>7#include <linux/init.h>8#include <linux/bio.h>9#include <linux/blk-integrity.h>10#include <linux/pagemap.h>11#include <linux/backing-dev-defs.h>12#include <linux/gcd.h>13#include <linux/lcm.h>14#include <linux/jiffies.h>15#include <linux/gfp.h>16#include <linux/dma-mapping.h>17 18#include "blk.h"19#include "blk-rq-qos.h"20#include "blk-wbt.h"21 22void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout)23{24 q->rq_timeout = timeout;25}26EXPORT_SYMBOL_GPL(blk_queue_rq_timeout);27 28/**29 * blk_set_stacking_limits - set default limits for stacking devices30 * @lim: the queue_limits structure to reset31 *32 * Prepare queue limits for applying limits from underlying devices using33 * blk_stack_limits().34 */35void blk_set_stacking_limits(struct queue_limits *lim)36{37 memset(lim, 0, sizeof(*lim));38 lim->logical_block_size = SECTOR_SIZE;39 lim->physical_block_size = SECTOR_SIZE;40 lim->io_min = SECTOR_SIZE;41 lim->discard_granularity = SECTOR_SIZE;42 lim->dma_alignment = SECTOR_SIZE - 1;43 lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;44 45 /* Inherit limits from component devices */46 lim->max_segments = USHRT_MAX;47 lim->max_discard_segments = USHRT_MAX;48 lim->max_hw_sectors = UINT_MAX;49 lim->max_segment_size = UINT_MAX;50 lim->max_sectors = UINT_MAX;51 lim->max_dev_sectors = UINT_MAX;52 lim->max_write_zeroes_sectors = UINT_MAX;53 lim->max_zone_append_sectors = UINT_MAX;54 lim->max_user_discard_sectors = UINT_MAX;55}56EXPORT_SYMBOL(blk_set_stacking_limits);57 58void blk_apply_bdi_limits(struct backing_dev_info *bdi,59 struct queue_limits *lim)60{61 /*62 * For read-ahead of large files to be effective, we need to read ahead63 * at least twice the optimal I/O size.64 */65 bdi->ra_pages = max(lim->io_opt * 2 / PAGE_SIZE, VM_READAHEAD_PAGES);66 bdi->io_pages = lim->max_sectors >> PAGE_SECTORS_SHIFT;67}68 69static int blk_validate_zoned_limits(struct queue_limits *lim)70{71 if (!(lim->features & BLK_FEAT_ZONED)) {72 if (WARN_ON_ONCE(lim->max_open_zones) ||73 WARN_ON_ONCE(lim->max_active_zones) ||74 WARN_ON_ONCE(lim->zone_write_granularity) ||75 WARN_ON_ONCE(lim->max_zone_append_sectors))76 return -EINVAL;77 return 0;78 }79 80 if (WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)))81 return -EINVAL;82 83 /*84 * Given that active zones include open zones, the maximum number of85 * open zones cannot be larger than the maximum number of active zones.86 */87 if (lim->max_active_zones &&88 lim->max_open_zones > lim->max_active_zones)89 return -EINVAL;90 91 if (lim->zone_write_granularity < lim->logical_block_size)92 lim->zone_write_granularity = lim->logical_block_size;93 94 if (lim->max_zone_append_sectors) {95 /*96 * The Zone Append size is limited by the maximum I/O size97 * and the zone size given that it can't span zones.98 */99 lim->max_zone_append_sectors =100 min3(lim->max_hw_sectors,101 lim->max_zone_append_sectors,102 lim->chunk_sectors);103 }104 105 return 0;106}107 108static int blk_validate_integrity_limits(struct queue_limits *lim)109{110 struct blk_integrity *bi = &lim->integrity;111 112 if (!bi->tuple_size) {113 if (bi->csum_type != BLK_INTEGRITY_CSUM_NONE ||114 bi->tag_size || ((bi->flags & BLK_INTEGRITY_REF_TAG))) {115 pr_warn("invalid PI settings.\n");116 return -EINVAL;117 }118 return 0;119 }120 121 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY)) {122 pr_warn("integrity support disabled.\n");123 return -EINVAL;124 }125 126 if (bi->csum_type == BLK_INTEGRITY_CSUM_NONE &&127 (bi->flags & BLK_INTEGRITY_REF_TAG)) {128 pr_warn("ref tag not support without checksum.\n");129 return -EINVAL;130 }131 132 if (!bi->interval_exp)133 bi->interval_exp = ilog2(lim->logical_block_size);134 135 return 0;136}137 138/*139 * Returns max guaranteed bytes which we can fit in a bio.140 *141 * We request that an atomic_write is ITER_UBUF iov_iter (so a single vector),142 * so we assume that we can fit in at least PAGE_SIZE in a segment, apart from143 * the first and last segments.144 */145static unsigned int blk_queue_max_guaranteed_bio(struct queue_limits *lim)146{147 unsigned int max_segments = min(BIO_MAX_VECS, lim->max_segments);148 unsigned int length;149 150 length = min(max_segments, 2) * lim->logical_block_size;151 if (max_segments > 2)152 length += (max_segments - 2) * PAGE_SIZE;153 154 return length;155}156 157static void blk_atomic_writes_update_limits(struct queue_limits *lim)158{159 unsigned int unit_limit = min(lim->max_hw_sectors << SECTOR_SHIFT,160 blk_queue_max_guaranteed_bio(lim));161 162 unit_limit = rounddown_pow_of_two(unit_limit);163 164 lim->atomic_write_max_sectors =165 min(lim->atomic_write_hw_max >> SECTOR_SHIFT,166 lim->max_hw_sectors);167 lim->atomic_write_unit_min =168 min(lim->atomic_write_hw_unit_min, unit_limit);169 lim->atomic_write_unit_max =170 min(lim->atomic_write_hw_unit_max, unit_limit);171 lim->atomic_write_boundary_sectors =172 lim->atomic_write_hw_boundary >> SECTOR_SHIFT;173}174 175static void blk_validate_atomic_write_limits(struct queue_limits *lim)176{177 unsigned int boundary_sectors;178 179 if (!lim->atomic_write_hw_max)180 goto unsupported;181 182 boundary_sectors = lim->atomic_write_hw_boundary >> SECTOR_SHIFT;183 184 if (boundary_sectors) {185 /*186 * A feature of boundary support is that it disallows bios to187 * be merged which would result in a merged request which188 * crosses either a chunk sector or atomic write HW boundary,189 * even though chunk sectors may be just set for performance.190 * For simplicity, disallow atomic writes for a chunk sector191 * which is non-zero and smaller than atomic write HW boundary.192 * Furthermore, chunk sectors must be a multiple of atomic193 * write HW boundary. Otherwise boundary support becomes194 * complicated.195 * Devices which do not conform to these rules can be dealt196 * with if and when they show up.197 */198 if (WARN_ON_ONCE(lim->chunk_sectors % boundary_sectors))199 goto unsupported;200 201 /*202 * The boundary size just needs to be a multiple of unit_max203 * (and not necessarily a power-of-2), so this following check204 * could be relaxed in future.205 * Furthermore, if needed, unit_max could even be reduced so206 * that it is compliant with a !power-of-2 boundary.207 */208 if (!is_power_of_2(boundary_sectors))209 goto unsupported;210 }211 212 blk_atomic_writes_update_limits(lim);213 return;214 215unsupported:216 lim->atomic_write_max_sectors = 0;217 lim->atomic_write_boundary_sectors = 0;218 lim->atomic_write_unit_min = 0;219 lim->atomic_write_unit_max = 0;220}221 222/*223 * Check that the limits in lim are valid, initialize defaults for unset224 * values, and cap values based on others where needed.225 */226static int blk_validate_limits(struct queue_limits *lim)227{228 unsigned int max_hw_sectors;229 unsigned int logical_block_sectors;230 int err;231 232 /*233 * Unless otherwise specified, default to 512 byte logical blocks and a234 * physical block size equal to the logical block size.235 */236 if (!lim->logical_block_size)237 lim->logical_block_size = SECTOR_SIZE;238 else if (blk_validate_block_size(lim->logical_block_size)) {239 pr_warn("Invalid logical block size (%d)\n", lim->logical_block_size);240 return -EINVAL;241 }242 if (lim->physical_block_size < lim->logical_block_size)243 lim->physical_block_size = lim->logical_block_size;244 245 /*246 * The minimum I/O size defaults to the physical block size unless247 * explicitly overridden.248 */249 if (lim->io_min < lim->physical_block_size)250 lim->io_min = lim->physical_block_size;251 252 /*253 * max_hw_sectors has a somewhat weird default for historical reason,254 * but driver really should set their own instead of relying on this255 * value.256 *257 * The block layer relies on the fact that every driver can258 * handle at lest a page worth of data per I/O, and needs the value259 * aligned to the logical block size.260 */261 if (!lim->max_hw_sectors)262 lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS;263 if (WARN_ON_ONCE(lim->max_hw_sectors < PAGE_SECTORS))264 return -EINVAL;265 logical_block_sectors = lim->logical_block_size >> SECTOR_SHIFT;266 if (WARN_ON_ONCE(logical_block_sectors > lim->max_hw_sectors))267 return -EINVAL;268 lim->max_hw_sectors = round_down(lim->max_hw_sectors,269 logical_block_sectors);270 271 /*272 * The actual max_sectors value is a complex beast and also takes the273 * max_dev_sectors value (set by SCSI ULPs) and a user configurable274 * value into account. The ->max_sectors value is always calculated275 * from these, so directly setting it won't have any effect.276 */277 max_hw_sectors = min_not_zero(lim->max_hw_sectors,278 lim->max_dev_sectors);279 if (lim->max_user_sectors) {280 if (lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE)281 return -EINVAL;282 lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors);283 } else if (lim->io_opt > (BLK_DEF_MAX_SECTORS_CAP << SECTOR_SHIFT)) {284 lim->max_sectors =285 min(max_hw_sectors, lim->io_opt >> SECTOR_SHIFT);286 } else if (lim->io_min > (BLK_DEF_MAX_SECTORS_CAP << SECTOR_SHIFT)) {287 lim->max_sectors =288 min(max_hw_sectors, lim->io_min >> SECTOR_SHIFT);289 } else {290 lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP);291 }292 lim->max_sectors = round_down(lim->max_sectors,293 logical_block_sectors);294 295 /*296 * Random default for the maximum number of segments. Driver should not297 * rely on this and set their own.298 */299 if (!lim->max_segments)300 lim->max_segments = BLK_MAX_SEGMENTS;301 302 lim->max_discard_sectors =303 min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors);304 305 if (!lim->max_discard_segments)306 lim->max_discard_segments = 1;307 308 if (lim->discard_granularity < lim->physical_block_size)309 lim->discard_granularity = lim->physical_block_size;310 311 /*312 * By default there is no limit on the segment boundary alignment,313 * but if there is one it can't be smaller than the page size as314 * that would break all the normal I/O patterns.315 */316 if (!lim->seg_boundary_mask)317 lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK;318 if (WARN_ON_ONCE(lim->seg_boundary_mask < PAGE_SIZE - 1))319 return -EINVAL;320 321 /*322 * Stacking device may have both virtual boundary and max segment323 * size limit, so allow this setting now, and long-term the two324 * might need to move out of stacking limits since we have immutable325 * bvec and lower layer bio splitting is supposed to handle the two326 * correctly.327 */328 if (lim->virt_boundary_mask) {329 if (!lim->max_segment_size)330 lim->max_segment_size = UINT_MAX;331 } else {332 /*333 * The maximum segment size has an odd historic 64k default that334 * drivers probably should override. Just like the I/O size we335 * require drivers to at least handle a full page per segment.336 */337 if (!lim->max_segment_size)338 lim->max_segment_size = BLK_MAX_SEGMENT_SIZE;339 if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE))340 return -EINVAL;341 }342 343 /*344 * We require drivers to at least do logical block aligned I/O, but345 * historically could not check for that due to the separate calls346 * to set the limits. Once the transition is finished the check347 * below should be narrowed down to check the logical block size.348 */349 if (!lim->dma_alignment)350 lim->dma_alignment = SECTOR_SIZE - 1;351 if (WARN_ON_ONCE(lim->dma_alignment > PAGE_SIZE))352 return -EINVAL;353 354 if (lim->alignment_offset) {355 lim->alignment_offset &= (lim->physical_block_size - 1);356 lim->flags &= ~BLK_FLAG_MISALIGNED;357 }358 359 if (!(lim->features & BLK_FEAT_WRITE_CACHE))360 lim->features &= ~BLK_FEAT_FUA;361 362 blk_validate_atomic_write_limits(lim);363 364 err = blk_validate_integrity_limits(lim);365 if (err)366 return err;367 return blk_validate_zoned_limits(lim);368}369 370/*371 * Set the default limits for a newly allocated queue. @lim contains the372 * initial limits set by the driver, which could be no limit in which case373 * all fields are cleared to zero.374 */375int blk_set_default_limits(struct queue_limits *lim)376{377 /*378 * Most defaults are set by capping the bounds in blk_validate_limits,379 * but max_user_discard_sectors is special and needs an explicit380 * initialization to the max value here.381 */382 lim->max_user_discard_sectors = UINT_MAX;383 return blk_validate_limits(lim);384}385 386/**387 * queue_limits_commit_update - commit an atomic update of queue limits388 * @q: queue to update389 * @lim: limits to apply390 *391 * Apply the limits in @lim that were obtained from queue_limits_start_update()392 * and updated by the caller to @q.393 *394 * Returns 0 if successful, else a negative error code.395 */396int queue_limits_commit_update(struct request_queue *q,397 struct queue_limits *lim)398{399 int error;400 401 error = blk_validate_limits(lim);402 if (error)403 goto out_unlock;404 405#ifdef CONFIG_BLK_INLINE_ENCRYPTION406 if (q->crypto_profile && lim->integrity.tag_size) {407 pr_warn("blk-integrity: Integrity and hardware inline encryption are not supported together.\n");408 error = -EINVAL;409 goto out_unlock;410 }411#endif412 413 q->limits = *lim;414 if (q->disk)415 blk_apply_bdi_limits(q->disk->bdi, lim);416out_unlock:417 mutex_unlock(&q->limits_lock);418 return error;419}420EXPORT_SYMBOL_GPL(queue_limits_commit_update);421 422/**423 * queue_limits_set - apply queue limits to queue424 * @q: queue to update425 * @lim: limits to apply426 *427 * Apply the limits in @lim that were freshly initialized to @q.428 * To update existing limits use queue_limits_start_update() and429 * queue_limits_commit_update() instead.430 *431 * Returns 0 if successful, else a negative error code.432 */433int queue_limits_set(struct request_queue *q, struct queue_limits *lim)434{435 mutex_lock(&q->limits_lock);436 return queue_limits_commit_update(q, lim);437}438EXPORT_SYMBOL_GPL(queue_limits_set);439 440static int queue_limit_alignment_offset(const struct queue_limits *lim,441 sector_t sector)442{443 unsigned int granularity = max(lim->physical_block_size, lim->io_min);444 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)445 << SECTOR_SHIFT;446 447 return (granularity + lim->alignment_offset - alignment) % granularity;448}449 450static unsigned int queue_limit_discard_alignment(451 const struct queue_limits *lim, sector_t sector)452{453 unsigned int alignment, granularity, offset;454 455 if (!lim->max_discard_sectors)456 return 0;457 458 /* Why are these in bytes, not sectors? */459 alignment = lim->discard_alignment >> SECTOR_SHIFT;460 granularity = lim->discard_granularity >> SECTOR_SHIFT;461 if (!granularity)462 return 0;463 464 /* Offset of the partition start in 'granularity' sectors */465 offset = sector_div(sector, granularity);466 467 /* And why do we do this modulus *again* in blkdev_issue_discard()? */468 offset = (granularity + alignment - offset) % granularity;469 470 /* Turn it back into bytes, gaah */471 return offset << SECTOR_SHIFT;472}473 474static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs)475{476 sectors = round_down(sectors, lbs >> SECTOR_SHIFT);477 if (sectors < PAGE_SIZE >> SECTOR_SHIFT)478 sectors = PAGE_SIZE >> SECTOR_SHIFT;479 return sectors;480}481 482/**483 * blk_stack_limits - adjust queue_limits for stacked devices484 * @t: the stacking driver limits (top device)485 * @b: the underlying queue limits (bottom, component device)486 * @start: first data sector within component device487 *488 * Description:489 * This function is used by stacking drivers like MD and DM to ensure490 * that all component devices have compatible block sizes and491 * alignments. The stacking driver must provide a queue_limits492 * struct (top) and then iteratively call the stacking function for493 * all component (bottom) devices. The stacking function will494 * attempt to combine the values and ensure proper alignment.495 *496 * Returns 0 if the top and bottom queue_limits are compatible. The497 * top device's block sizes and alignment offsets may be adjusted to498 * ensure alignment with the bottom device. If no compatible sizes499 * and alignments exist, -1 is returned and the resulting top500 * queue_limits will have the misaligned flag set to indicate that501 * the alignment_offset is undefined.502 */503int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,504 sector_t start)505{506 unsigned int top, bottom, alignment, ret = 0;507 508 t->features |= (b->features & BLK_FEAT_INHERIT_MASK);509 510 /*511 * BLK_FEAT_NOWAIT and BLK_FEAT_POLL need to be supported both by the512 * stacking driver and all underlying devices. The stacking driver sets513 * the flags before stacking the limits, and this will clear the flags514 * if any of the underlying devices does not support it.515 */516 if (!(b->features & BLK_FEAT_NOWAIT))517 t->features &= ~BLK_FEAT_NOWAIT;518 if (!(b->features & BLK_FEAT_POLL))519 t->features &= ~BLK_FEAT_POLL;520 521 t->flags |= (b->flags & BLK_FLAG_MISALIGNED);522 523 t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors);524 t->max_user_sectors = min_not_zero(t->max_user_sectors,525 b->max_user_sectors);526 t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors);527 t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors);528 t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors,529 b->max_write_zeroes_sectors);530 t->max_zone_append_sectors = min(queue_limits_max_zone_append_sectors(t),531 queue_limits_max_zone_append_sectors(b));532 533 t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask,534 b->seg_boundary_mask);535 t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask,536 b->virt_boundary_mask);537 538 t->max_segments = min_not_zero(t->max_segments, b->max_segments);539 t->max_discard_segments = min_not_zero(t->max_discard_segments,540 b->max_discard_segments);541 t->max_integrity_segments = min_not_zero(t->max_integrity_segments,542 b->max_integrity_segments);543 544 t->max_segment_size = min_not_zero(t->max_segment_size,545 b->max_segment_size);546 547 alignment = queue_limit_alignment_offset(b, start);548 549 /* Bottom device has different alignment. Check that it is550 * compatible with the current top alignment.551 */552 if (t->alignment_offset != alignment) {553 554 top = max(t->physical_block_size, t->io_min)555 + t->alignment_offset;556 bottom = max(b->physical_block_size, b->io_min) + alignment;557 558 /* Verify that top and bottom intervals line up */559 if (max(top, bottom) % min(top, bottom)) {560 t->flags |= BLK_FLAG_MISALIGNED;561 ret = -1;562 }563 }564 565 t->logical_block_size = max(t->logical_block_size,566 b->logical_block_size);567 568 t->physical_block_size = max(t->physical_block_size,569 b->physical_block_size);570 571 t->io_min = max(t->io_min, b->io_min);572 t->io_opt = lcm_not_zero(t->io_opt, b->io_opt);573 t->dma_alignment = max(t->dma_alignment, b->dma_alignment);574 575 /* Set non-power-of-2 compatible chunk_sectors boundary */576 if (b->chunk_sectors)577 t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors);578 579 /* Physical block size a multiple of the logical block size? */580 if (t->physical_block_size & (t->logical_block_size - 1)) {581 t->physical_block_size = t->logical_block_size;582 t->flags |= BLK_FLAG_MISALIGNED;583 ret = -1;584 }585 586 /* Minimum I/O a multiple of the physical block size? */587 if (t->io_min & (t->physical_block_size - 1)) {588 t->io_min = t->physical_block_size;589 t->flags |= BLK_FLAG_MISALIGNED;590 ret = -1;591 }592 593 /* Optimal I/O a multiple of the physical block size? */594 if (t->io_opt & (t->physical_block_size - 1)) {595 t->io_opt = 0;596 t->flags |= BLK_FLAG_MISALIGNED;597 ret = -1;598 }599 600 /* chunk_sectors a multiple of the physical block size? */601 if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) {602 t->chunk_sectors = 0;603 t->flags |= BLK_FLAG_MISALIGNED;604 ret = -1;605 }606 607 /* Find lowest common alignment_offset */608 t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment)609 % max(t->physical_block_size, t->io_min);610 611 /* Verify that new alignment_offset is on a logical block boundary */612 if (t->alignment_offset & (t->logical_block_size - 1)) {613 t->flags |= BLK_FLAG_MISALIGNED;614 ret = -1;615 }616 617 t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size);618 t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size);619 t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size);620 621 /* Discard alignment and granularity */622 if (b->discard_granularity) {623 alignment = queue_limit_discard_alignment(b, start);624 625 t->max_discard_sectors = min_not_zero(t->max_discard_sectors,626 b->max_discard_sectors);627 t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors,628 b->max_hw_discard_sectors);629 t->discard_granularity = max(t->discard_granularity,630 b->discard_granularity);631 t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) %632 t->discard_granularity;633 }634 t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors,635 b->max_secure_erase_sectors);636 t->zone_write_granularity = max(t->zone_write_granularity,637 b->zone_write_granularity);638 if (!(t->features & BLK_FEAT_ZONED)) {639 t->zone_write_granularity = 0;640 t->max_zone_append_sectors = 0;641 }642 return ret;643}644EXPORT_SYMBOL(blk_stack_limits);645 646/**647 * queue_limits_stack_bdev - adjust queue_limits for stacked devices648 * @t: the stacking driver limits (top device)649 * @bdev: the underlying block device (bottom)650 * @offset: offset to beginning of data within component device651 * @pfx: prefix to use for warnings logged652 *653 * Description:654 * This function is used by stacking drivers like MD and DM to ensure655 * that all component devices have compatible block sizes and656 * alignments. The stacking driver must provide a queue_limits657 * struct (top) and then iteratively call the stacking function for658 * all component (bottom) devices. The stacking function will659 * attempt to combine the values and ensure proper alignment.660 */661void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,662 sector_t offset, const char *pfx)663{664 if (blk_stack_limits(t, &bdev_get_queue(bdev)->limits,665 get_start_sect(bdev) + offset))666 pr_notice("%s: Warning: Device %pg is misaligned\n",667 pfx, bdev);668}669EXPORT_SYMBOL_GPL(queue_limits_stack_bdev);670 671/**672 * queue_limits_stack_integrity - stack integrity profile673 * @t: target queue limits674 * @b: base queue limits675 *676 * Check if the integrity profile in the @b can be stacked into the677 * target @t. Stacking is possible if either:678 *679 * a) does not have any integrity information stacked into it yet680 * b) the integrity profile in @b is identical to the one in @t681 *682 * If @b can be stacked into @t, return %true. Else return %false and clear the683 * integrity information in @t.684 */685bool queue_limits_stack_integrity(struct queue_limits *t,686 struct queue_limits *b)687{688 struct blk_integrity *ti = &t->integrity;689 struct blk_integrity *bi = &b->integrity;690 691 if (!IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY))692 return true;693 694 if (!ti->tuple_size) {695 /* inherit the settings from the first underlying device */696 if (!(ti->flags & BLK_INTEGRITY_STACKED)) {697 ti->flags = BLK_INTEGRITY_DEVICE_CAPABLE |698 (bi->flags & BLK_INTEGRITY_REF_TAG);699 ti->csum_type = bi->csum_type;700 ti->tuple_size = bi->tuple_size;701 ti->pi_offset = bi->pi_offset;702 ti->interval_exp = bi->interval_exp;703 ti->tag_size = bi->tag_size;704 goto done;705 }706 if (!bi->tuple_size)707 goto done;708 }709 710 if (ti->tuple_size != bi->tuple_size)711 goto incompatible;712 if (ti->interval_exp != bi->interval_exp)713 goto incompatible;714 if (ti->tag_size != bi->tag_size)715 goto incompatible;716 if (ti->csum_type != bi->csum_type)717 goto incompatible;718 if ((ti->flags & BLK_INTEGRITY_REF_TAG) !=719 (bi->flags & BLK_INTEGRITY_REF_TAG))720 goto incompatible;721 722done:723 ti->flags |= BLK_INTEGRITY_STACKED;724 return true;725 726incompatible:727 memset(ti, 0, sizeof(*ti));728 return false;729}730EXPORT_SYMBOL_GPL(queue_limits_stack_integrity);731 732/**733 * blk_set_queue_depth - tell the block layer about the device queue depth734 * @q: the request queue for the device735 * @depth: queue depth736 *737 */738void blk_set_queue_depth(struct request_queue *q, unsigned int depth)739{740 q->queue_depth = depth;741 rq_qos_queue_depth_changed(q);742}743EXPORT_SYMBOL(blk_set_queue_depth);744 745int bdev_alignment_offset(struct block_device *bdev)746{747 struct request_queue *q = bdev_get_queue(bdev);748 749 if (q->limits.flags & BLK_FLAG_MISALIGNED)750 return -1;751 if (bdev_is_partition(bdev))752 return queue_limit_alignment_offset(&q->limits,753 bdev->bd_start_sect);754 return q->limits.alignment_offset;755}756EXPORT_SYMBOL_GPL(bdev_alignment_offset);757 758unsigned int bdev_discard_alignment(struct block_device *bdev)759{760 struct request_queue *q = bdev_get_queue(bdev);761 762 if (bdev_is_partition(bdev))763 return queue_limit_discard_alignment(&q->limits,764 bdev->bd_start_sect);765 return q->limits.discard_alignment;766}767EXPORT_SYMBOL_GPL(bdev_discard_alignment);768