1 | // SPDX-License-Identifier: GPL-2.0 |
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> |
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 | |
22 | void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) |
23 | { |
24 | q->rq_timeout = timeout; |
25 | } |
26 | EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); |
27 | |
28 | /** |
29 | * blk_set_default_limits - reset limits to default values |
30 | * @lim: the queue_limits structure to reset |
31 | * |
32 | * Description: |
33 | * Returns a queue_limit struct to its default state. |
34 | */ |
35 | void blk_set_default_limits(struct queue_limits *lim) |
36 | { |
37 | lim->max_segments = BLK_MAX_SEGMENTS; |
38 | lim->max_discard_segments = 1; |
39 | lim->max_integrity_segments = 0; |
40 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; |
41 | lim->virt_boundary_mask = 0; |
42 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
43 | lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; |
44 | lim->max_user_sectors = lim->max_dev_sectors = 0; |
45 | lim->chunk_sectors = 0; |
46 | lim->max_write_zeroes_sectors = 0; |
47 | lim->max_zone_append_sectors = 0; |
48 | lim->max_discard_sectors = 0; |
49 | lim->max_hw_discard_sectors = 0; |
50 | lim->max_secure_erase_sectors = 0; |
51 | lim->discard_granularity = 0; |
52 | lim->discard_alignment = 0; |
53 | lim->discard_misaligned = 0; |
54 | lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; |
55 | lim->bounce = BLK_BOUNCE_NONE; |
56 | lim->alignment_offset = 0; |
57 | lim->io_opt = 0; |
58 | lim->misaligned = 0; |
59 | lim->zoned = BLK_ZONED_NONE; |
60 | lim->zone_write_granularity = 0; |
61 | lim->dma_alignment = 511; |
62 | } |
63 | |
64 | /** |
65 | * blk_set_stacking_limits - set default limits for stacking devices |
66 | * @lim: the queue_limits structure to reset |
67 | * |
68 | * Description: |
69 | * Returns a queue_limit struct to its default state. Should be used |
70 | * by stacking drivers like DM that have no internal limits. |
71 | */ |
72 | void blk_set_stacking_limits(struct queue_limits *lim) |
73 | { |
74 | blk_set_default_limits(lim); |
75 | |
76 | /* Inherit limits from component devices */ |
77 | lim->max_segments = USHRT_MAX; |
78 | lim->max_discard_segments = USHRT_MAX; |
79 | lim->max_hw_sectors = UINT_MAX; |
80 | lim->max_segment_size = UINT_MAX; |
81 | lim->max_sectors = UINT_MAX; |
82 | lim->max_dev_sectors = UINT_MAX; |
83 | lim->max_write_zeroes_sectors = UINT_MAX; |
84 | lim->max_zone_append_sectors = UINT_MAX; |
85 | } |
86 | EXPORT_SYMBOL(blk_set_stacking_limits); |
87 | |
88 | /** |
89 | * blk_queue_bounce_limit - set bounce buffer limit for queue |
90 | * @q: the request queue for the device |
91 | * @bounce: bounce limit to enforce |
92 | * |
93 | * Description: |
94 | * Force bouncing for ISA DMA ranges or highmem. |
95 | * |
96 | * DEPRECATED, don't use in new code. |
97 | **/ |
98 | void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce) |
99 | { |
100 | q->limits.bounce = bounce; |
101 | } |
102 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
103 | |
104 | /** |
105 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
106 | * @q: the request queue for the device |
107 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
108 | * |
109 | * Description: |
110 | * Enables a low level driver to set a hard upper limit, |
111 | * max_hw_sectors, on the size of requests. max_hw_sectors is set by |
112 | * the device driver based upon the capabilities of the I/O |
113 | * controller. |
114 | * |
115 | * max_dev_sectors is a hard limit imposed by the storage device for |
116 | * READ/WRITE requests. It is set by the disk driver. |
117 | * |
118 | * max_sectors is a soft limit imposed by the block layer for |
119 | * filesystem type requests. This value can be overridden on a |
120 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. |
121 | * The soft limit can not exceed max_hw_sectors. |
122 | **/ |
123 | void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
124 | { |
125 | struct queue_limits *limits = &q->limits; |
126 | unsigned int max_sectors; |
127 | |
128 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
129 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); |
130 | printk(KERN_INFO "%s: set to minimum %d\n" , |
131 | __func__, max_hw_sectors); |
132 | } |
133 | |
134 | max_hw_sectors = round_down(max_hw_sectors, |
135 | limits->logical_block_size >> SECTOR_SHIFT); |
136 | limits->max_hw_sectors = max_hw_sectors; |
137 | |
138 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
139 | |
140 | if (limits->max_user_sectors) |
141 | max_sectors = min(max_sectors, limits->max_user_sectors); |
142 | else |
143 | max_sectors = min(max_sectors, BLK_DEF_MAX_SECTORS); |
144 | |
145 | max_sectors = round_down(max_sectors, |
146 | limits->logical_block_size >> SECTOR_SHIFT); |
147 | limits->max_sectors = max_sectors; |
148 | |
149 | if (!q->disk) |
150 | return; |
151 | q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
152 | } |
153 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
154 | |
155 | /** |
156 | * blk_queue_chunk_sectors - set size of the chunk for this queue |
157 | * @q: the request queue for the device |
158 | * @chunk_sectors: chunk sectors in the usual 512b unit |
159 | * |
160 | * Description: |
161 | * If a driver doesn't want IOs to cross a given chunk size, it can set |
162 | * this limit and prevent merging across chunks. Note that the block layer |
163 | * must accept a page worth of data at any offset. So if the crossing of |
164 | * chunks is a hard limitation in the driver, it must still be prepared |
165 | * to split single page bios. |
166 | **/ |
167 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) |
168 | { |
169 | q->limits.chunk_sectors = chunk_sectors; |
170 | } |
171 | EXPORT_SYMBOL(blk_queue_chunk_sectors); |
172 | |
173 | /** |
174 | * blk_queue_max_discard_sectors - set max sectors for a single discard |
175 | * @q: the request queue for the device |
176 | * @max_discard_sectors: maximum number of sectors to discard |
177 | **/ |
178 | void blk_queue_max_discard_sectors(struct request_queue *q, |
179 | unsigned int max_discard_sectors) |
180 | { |
181 | q->limits.max_hw_discard_sectors = max_discard_sectors; |
182 | q->limits.max_discard_sectors = max_discard_sectors; |
183 | } |
184 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); |
185 | |
186 | /** |
187 | * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase |
188 | * @q: the request queue for the device |
189 | * @max_sectors: maximum number of sectors to secure_erase |
190 | **/ |
191 | void blk_queue_max_secure_erase_sectors(struct request_queue *q, |
192 | unsigned int max_sectors) |
193 | { |
194 | q->limits.max_secure_erase_sectors = max_sectors; |
195 | } |
196 | EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors); |
197 | |
198 | /** |
199 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single |
200 | * write zeroes |
201 | * @q: the request queue for the device |
202 | * @max_write_zeroes_sectors: maximum number of sectors to write per command |
203 | **/ |
204 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
205 | unsigned int max_write_zeroes_sectors) |
206 | { |
207 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; |
208 | } |
209 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); |
210 | |
211 | /** |
212 | * blk_queue_max_zone_append_sectors - set max sectors for a single zone append |
213 | * @q: the request queue for the device |
214 | * @max_zone_append_sectors: maximum number of sectors to write per command |
215 | **/ |
216 | void blk_queue_max_zone_append_sectors(struct request_queue *q, |
217 | unsigned int max_zone_append_sectors) |
218 | { |
219 | unsigned int max_sectors; |
220 | |
221 | if (WARN_ON(!blk_queue_is_zoned(q))) |
222 | return; |
223 | |
224 | max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors); |
225 | max_sectors = min(q->limits.chunk_sectors, max_sectors); |
226 | |
227 | /* |
228 | * Signal eventual driver bugs resulting in the max_zone_append sectors limit |
229 | * being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set, |
230 | * or the max_hw_sectors limit not set. |
231 | */ |
232 | WARN_ON(!max_sectors); |
233 | |
234 | q->limits.max_zone_append_sectors = max_sectors; |
235 | } |
236 | EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors); |
237 | |
238 | /** |
239 | * blk_queue_max_segments - set max hw segments for a request for this queue |
240 | * @q: the request queue for the device |
241 | * @max_segments: max number of segments |
242 | * |
243 | * Description: |
244 | * Enables a low level driver to set an upper limit on the number of |
245 | * hw data segments in a request. |
246 | **/ |
247 | void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
248 | { |
249 | if (!max_segments) { |
250 | max_segments = 1; |
251 | printk(KERN_INFO "%s: set to minimum %d\n" , |
252 | __func__, max_segments); |
253 | } |
254 | |
255 | q->limits.max_segments = max_segments; |
256 | } |
257 | EXPORT_SYMBOL(blk_queue_max_segments); |
258 | |
259 | /** |
260 | * blk_queue_max_discard_segments - set max segments for discard requests |
261 | * @q: the request queue for the device |
262 | * @max_segments: max number of segments |
263 | * |
264 | * Description: |
265 | * Enables a low level driver to set an upper limit on the number of |
266 | * segments in a discard request. |
267 | **/ |
268 | void blk_queue_max_discard_segments(struct request_queue *q, |
269 | unsigned short max_segments) |
270 | { |
271 | q->limits.max_discard_segments = max_segments; |
272 | } |
273 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); |
274 | |
275 | /** |
276 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg |
277 | * @q: the request queue for the device |
278 | * @max_size: max size of segment in bytes |
279 | * |
280 | * Description: |
281 | * Enables a low level driver to set an upper limit on the size of a |
282 | * coalesced segment |
283 | **/ |
284 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) |
285 | { |
286 | if (max_size < PAGE_SIZE) { |
287 | max_size = PAGE_SIZE; |
288 | printk(KERN_INFO "%s: set to minimum %d\n" , |
289 | __func__, max_size); |
290 | } |
291 | |
292 | /* see blk_queue_virt_boundary() for the explanation */ |
293 | WARN_ON_ONCE(q->limits.virt_boundary_mask); |
294 | |
295 | q->limits.max_segment_size = max_size; |
296 | } |
297 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
298 | |
299 | /** |
300 | * blk_queue_logical_block_size - set logical block size for the queue |
301 | * @q: the request queue for the device |
302 | * @size: the logical block size, in bytes |
303 | * |
304 | * Description: |
305 | * This should be set to the lowest possible block size that the |
306 | * storage device can address. The default of 512 covers most |
307 | * hardware. |
308 | **/ |
309 | void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) |
310 | { |
311 | struct queue_limits *limits = &q->limits; |
312 | |
313 | limits->logical_block_size = size; |
314 | |
315 | if (limits->physical_block_size < size) |
316 | limits->physical_block_size = size; |
317 | |
318 | if (limits->io_min < limits->physical_block_size) |
319 | limits->io_min = limits->physical_block_size; |
320 | |
321 | limits->max_hw_sectors = |
322 | round_down(limits->max_hw_sectors, size >> SECTOR_SHIFT); |
323 | limits->max_sectors = |
324 | round_down(limits->max_sectors, size >> SECTOR_SHIFT); |
325 | } |
326 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
327 | |
328 | /** |
329 | * blk_queue_physical_block_size - set physical block size for the queue |
330 | * @q: the request queue for the device |
331 | * @size: the physical block size, in bytes |
332 | * |
333 | * Description: |
334 | * This should be set to the lowest possible sector size that the |
335 | * hardware can operate on without reverting to read-modify-write |
336 | * operations. |
337 | */ |
338 | void blk_queue_physical_block_size(struct request_queue *q, unsigned int size) |
339 | { |
340 | q->limits.physical_block_size = size; |
341 | |
342 | if (q->limits.physical_block_size < q->limits.logical_block_size) |
343 | q->limits.physical_block_size = q->limits.logical_block_size; |
344 | |
345 | if (q->limits.io_min < q->limits.physical_block_size) |
346 | q->limits.io_min = q->limits.physical_block_size; |
347 | } |
348 | EXPORT_SYMBOL(blk_queue_physical_block_size); |
349 | |
350 | /** |
351 | * blk_queue_zone_write_granularity - set zone write granularity for the queue |
352 | * @q: the request queue for the zoned device |
353 | * @size: the zone write granularity size, in bytes |
354 | * |
355 | * Description: |
356 | * This should be set to the lowest possible size allowing to write in |
357 | * sequential zones of a zoned block device. |
358 | */ |
359 | void blk_queue_zone_write_granularity(struct request_queue *q, |
360 | unsigned int size) |
361 | { |
362 | if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) |
363 | return; |
364 | |
365 | q->limits.zone_write_granularity = size; |
366 | |
367 | if (q->limits.zone_write_granularity < q->limits.logical_block_size) |
368 | q->limits.zone_write_granularity = q->limits.logical_block_size; |
369 | } |
370 | EXPORT_SYMBOL_GPL(blk_queue_zone_write_granularity); |
371 | |
372 | /** |
373 | * blk_queue_alignment_offset - set physical block alignment offset |
374 | * @q: the request queue for the device |
375 | * @offset: alignment offset in bytes |
376 | * |
377 | * Description: |
378 | * Some devices are naturally misaligned to compensate for things like |
379 | * the legacy DOS partition table 63-sector offset. Low-level drivers |
380 | * should call this function for devices whose first sector is not |
381 | * naturally aligned. |
382 | */ |
383 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) |
384 | { |
385 | q->limits.alignment_offset = |
386 | offset & (q->limits.physical_block_size - 1); |
387 | q->limits.misaligned = 0; |
388 | } |
389 | EXPORT_SYMBOL(blk_queue_alignment_offset); |
390 | |
391 | void disk_update_readahead(struct gendisk *disk) |
392 | { |
393 | struct request_queue *q = disk->queue; |
394 | |
395 | /* |
396 | * For read-ahead of large files to be effective, we need to read ahead |
397 | * at least twice the optimal I/O size. |
398 | */ |
399 | disk->bdi->ra_pages = |
400 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
401 | disk->bdi->io_pages = queue_max_sectors(q) >> (PAGE_SHIFT - 9); |
402 | } |
403 | EXPORT_SYMBOL_GPL(disk_update_readahead); |
404 | |
405 | /** |
406 | * blk_limits_io_min - set minimum request size for a device |
407 | * @limits: the queue limits |
408 | * @min: smallest I/O size in bytes |
409 | * |
410 | * Description: |
411 | * Some devices have an internal block size bigger than the reported |
412 | * hardware sector size. This function can be used to signal the |
413 | * smallest I/O the device can perform without incurring a performance |
414 | * penalty. |
415 | */ |
416 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) |
417 | { |
418 | limits->io_min = min; |
419 | |
420 | if (limits->io_min < limits->logical_block_size) |
421 | limits->io_min = limits->logical_block_size; |
422 | |
423 | if (limits->io_min < limits->physical_block_size) |
424 | limits->io_min = limits->physical_block_size; |
425 | } |
426 | EXPORT_SYMBOL(blk_limits_io_min); |
427 | |
428 | /** |
429 | * blk_queue_io_min - set minimum request size for the queue |
430 | * @q: the request queue for the device |
431 | * @min: smallest I/O size in bytes |
432 | * |
433 | * Description: |
434 | * Storage devices may report a granularity or preferred minimum I/O |
435 | * size which is the smallest request the device can perform without |
436 | * incurring a performance penalty. For disk drives this is often the |
437 | * physical block size. For RAID arrays it is often the stripe chunk |
438 | * size. A properly aligned multiple of minimum_io_size is the |
439 | * preferred request size for workloads where a high number of I/O |
440 | * operations is desired. |
441 | */ |
442 | void blk_queue_io_min(struct request_queue *q, unsigned int min) |
443 | { |
444 | blk_limits_io_min(&q->limits, min); |
445 | } |
446 | EXPORT_SYMBOL(blk_queue_io_min); |
447 | |
448 | /** |
449 | * blk_limits_io_opt - set optimal request size for a device |
450 | * @limits: the queue limits |
451 | * @opt: smallest I/O size in bytes |
452 | * |
453 | * Description: |
454 | * Storage devices may report an optimal I/O size, which is the |
455 | * device's preferred unit for sustained I/O. This is rarely reported |
456 | * for disk drives. For RAID arrays it is usually the stripe width or |
457 | * the internal track size. A properly aligned multiple of |
458 | * optimal_io_size is the preferred request size for workloads where |
459 | * sustained throughput is desired. |
460 | */ |
461 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) |
462 | { |
463 | limits->io_opt = opt; |
464 | } |
465 | EXPORT_SYMBOL(blk_limits_io_opt); |
466 | |
467 | /** |
468 | * blk_queue_io_opt - set optimal request size for the queue |
469 | * @q: the request queue for the device |
470 | * @opt: optimal request size in bytes |
471 | * |
472 | * Description: |
473 | * Storage devices may report an optimal I/O size, which is the |
474 | * device's preferred unit for sustained I/O. This is rarely reported |
475 | * for disk drives. For RAID arrays it is usually the stripe width or |
476 | * the internal track size. A properly aligned multiple of |
477 | * optimal_io_size is the preferred request size for workloads where |
478 | * sustained throughput is desired. |
479 | */ |
480 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) |
481 | { |
482 | blk_limits_io_opt(&q->limits, opt); |
483 | if (!q->disk) |
484 | return; |
485 | q->disk->bdi->ra_pages = |
486 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
487 | } |
488 | EXPORT_SYMBOL(blk_queue_io_opt); |
489 | |
490 | static int queue_limit_alignment_offset(const struct queue_limits *lim, |
491 | sector_t sector) |
492 | { |
493 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); |
494 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
495 | << SECTOR_SHIFT; |
496 | |
497 | return (granularity + lim->alignment_offset - alignment) % granularity; |
498 | } |
499 | |
500 | static unsigned int queue_limit_discard_alignment( |
501 | const struct queue_limits *lim, sector_t sector) |
502 | { |
503 | unsigned int alignment, granularity, offset; |
504 | |
505 | if (!lim->max_discard_sectors) |
506 | return 0; |
507 | |
508 | /* Why are these in bytes, not sectors? */ |
509 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
510 | granularity = lim->discard_granularity >> SECTOR_SHIFT; |
511 | if (!granularity) |
512 | return 0; |
513 | |
514 | /* Offset of the partition start in 'granularity' sectors */ |
515 | offset = sector_div(sector, granularity); |
516 | |
517 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ |
518 | offset = (granularity + alignment - offset) % granularity; |
519 | |
520 | /* Turn it back into bytes, gaah */ |
521 | return offset << SECTOR_SHIFT; |
522 | } |
523 | |
524 | static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs) |
525 | { |
526 | sectors = round_down(sectors, lbs >> SECTOR_SHIFT); |
527 | if (sectors < PAGE_SIZE >> SECTOR_SHIFT) |
528 | sectors = PAGE_SIZE >> SECTOR_SHIFT; |
529 | return sectors; |
530 | } |
531 | |
532 | /** |
533 | * blk_stack_limits - adjust queue_limits for stacked devices |
534 | * @t: the stacking driver limits (top device) |
535 | * @b: the underlying queue limits (bottom, component device) |
536 | * @start: first data sector within component device |
537 | * |
538 | * Description: |
539 | * This function is used by stacking drivers like MD and DM to ensure |
540 | * that all component devices have compatible block sizes and |
541 | * alignments. The stacking driver must provide a queue_limits |
542 | * struct (top) and then iteratively call the stacking function for |
543 | * all component (bottom) devices. The stacking function will |
544 | * attempt to combine the values and ensure proper alignment. |
545 | * |
546 | * Returns 0 if the top and bottom queue_limits are compatible. The |
547 | * top device's block sizes and alignment offsets may be adjusted to |
548 | * ensure alignment with the bottom device. If no compatible sizes |
549 | * and alignments exist, -1 is returned and the resulting top |
550 | * queue_limits will have the misaligned flag set to indicate that |
551 | * the alignment_offset is undefined. |
552 | */ |
553 | int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
554 | sector_t start) |
555 | { |
556 | unsigned int top, bottom, alignment, ret = 0; |
557 | |
558 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
559 | t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); |
560 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
561 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
562 | b->max_write_zeroes_sectors); |
563 | t->max_zone_append_sectors = min(t->max_zone_append_sectors, |
564 | b->max_zone_append_sectors); |
565 | t->bounce = max(t->bounce, b->bounce); |
566 | |
567 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, |
568 | b->seg_boundary_mask); |
569 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
570 | b->virt_boundary_mask); |
571 | |
572 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
573 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
574 | b->max_discard_segments); |
575 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
576 | b->max_integrity_segments); |
577 | |
578 | t->max_segment_size = min_not_zero(t->max_segment_size, |
579 | b->max_segment_size); |
580 | |
581 | t->misaligned |= b->misaligned; |
582 | |
583 | alignment = queue_limit_alignment_offset(lim: b, sector: start); |
584 | |
585 | /* Bottom device has different alignment. Check that it is |
586 | * compatible with the current top alignment. |
587 | */ |
588 | if (t->alignment_offset != alignment) { |
589 | |
590 | top = max(t->physical_block_size, t->io_min) |
591 | + t->alignment_offset; |
592 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
593 | |
594 | /* Verify that top and bottom intervals line up */ |
595 | if (max(top, bottom) % min(top, bottom)) { |
596 | t->misaligned = 1; |
597 | ret = -1; |
598 | } |
599 | } |
600 | |
601 | t->logical_block_size = max(t->logical_block_size, |
602 | b->logical_block_size); |
603 | |
604 | t->physical_block_size = max(t->physical_block_size, |
605 | b->physical_block_size); |
606 | |
607 | t->io_min = max(t->io_min, b->io_min); |
608 | t->io_opt = lcm_not_zero(a: t->io_opt, b: b->io_opt); |
609 | t->dma_alignment = max(t->dma_alignment, b->dma_alignment); |
610 | |
611 | /* Set non-power-of-2 compatible chunk_sectors boundary */ |
612 | if (b->chunk_sectors) |
613 | t->chunk_sectors = gcd(a: t->chunk_sectors, b: b->chunk_sectors); |
614 | |
615 | /* Physical block size a multiple of the logical block size? */ |
616 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
617 | t->physical_block_size = t->logical_block_size; |
618 | t->misaligned = 1; |
619 | ret = -1; |
620 | } |
621 | |
622 | /* Minimum I/O a multiple of the physical block size? */ |
623 | if (t->io_min & (t->physical_block_size - 1)) { |
624 | t->io_min = t->physical_block_size; |
625 | t->misaligned = 1; |
626 | ret = -1; |
627 | } |
628 | |
629 | /* Optimal I/O a multiple of the physical block size? */ |
630 | if (t->io_opt & (t->physical_block_size - 1)) { |
631 | t->io_opt = 0; |
632 | t->misaligned = 1; |
633 | ret = -1; |
634 | } |
635 | |
636 | /* chunk_sectors a multiple of the physical block size? */ |
637 | if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) { |
638 | t->chunk_sectors = 0; |
639 | t->misaligned = 1; |
640 | ret = -1; |
641 | } |
642 | |
643 | t->raid_partial_stripes_expensive = |
644 | max(t->raid_partial_stripes_expensive, |
645 | b->raid_partial_stripes_expensive); |
646 | |
647 | /* Find lowest common alignment_offset */ |
648 | t->alignment_offset = lcm_not_zero(a: t->alignment_offset, b: alignment) |
649 | % max(t->physical_block_size, t->io_min); |
650 | |
651 | /* Verify that new alignment_offset is on a logical block boundary */ |
652 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
653 | t->misaligned = 1; |
654 | ret = -1; |
655 | } |
656 | |
657 | t->max_sectors = blk_round_down_sectors(sectors: t->max_sectors, lbs: t->logical_block_size); |
658 | t->max_hw_sectors = blk_round_down_sectors(sectors: t->max_hw_sectors, lbs: t->logical_block_size); |
659 | t->max_dev_sectors = blk_round_down_sectors(sectors: t->max_dev_sectors, lbs: t->logical_block_size); |
660 | |
661 | /* Discard alignment and granularity */ |
662 | if (b->discard_granularity) { |
663 | alignment = queue_limit_discard_alignment(lim: b, sector: start); |
664 | |
665 | if (t->discard_granularity != 0 && |
666 | t->discard_alignment != alignment) { |
667 | top = t->discard_granularity + t->discard_alignment; |
668 | bottom = b->discard_granularity + alignment; |
669 | |
670 | /* Verify that top and bottom intervals line up */ |
671 | if ((max(top, bottom) % min(top, bottom)) != 0) |
672 | t->discard_misaligned = 1; |
673 | } |
674 | |
675 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
676 | b->max_discard_sectors); |
677 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
678 | b->max_hw_discard_sectors); |
679 | t->discard_granularity = max(t->discard_granularity, |
680 | b->discard_granularity); |
681 | t->discard_alignment = lcm_not_zero(a: t->discard_alignment, b: alignment) % |
682 | t->discard_granularity; |
683 | } |
684 | t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors, |
685 | b->max_secure_erase_sectors); |
686 | t->zone_write_granularity = max(t->zone_write_granularity, |
687 | b->zone_write_granularity); |
688 | t->zoned = max(t->zoned, b->zoned); |
689 | return ret; |
690 | } |
691 | EXPORT_SYMBOL(blk_stack_limits); |
692 | |
693 | /** |
694 | * disk_stack_limits - adjust queue limits for stacked drivers |
695 | * @disk: MD/DM gendisk (top) |
696 | * @bdev: the underlying block device (bottom) |
697 | * @offset: offset to beginning of data within component device |
698 | * |
699 | * Description: |
700 | * Merges the limits for a top level gendisk and a bottom level |
701 | * block_device. |
702 | */ |
703 | void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
704 | sector_t offset) |
705 | { |
706 | struct request_queue *t = disk->queue; |
707 | |
708 | if (blk_stack_limits(&t->limits, &bdev_get_queue(bdev)->limits, |
709 | get_start_sect(bdev) + (offset >> 9)) < 0) |
710 | pr_notice("%s: Warning: Device %pg is misaligned\n" , |
711 | disk->disk_name, bdev); |
712 | |
713 | disk_update_readahead(disk); |
714 | } |
715 | EXPORT_SYMBOL(disk_stack_limits); |
716 | |
717 | /** |
718 | * blk_queue_update_dma_pad - update pad mask |
719 | * @q: the request queue for the device |
720 | * @mask: pad mask |
721 | * |
722 | * Update dma pad mask. |
723 | * |
724 | * Appending pad buffer to a request modifies the last entry of a |
725 | * scatter list such that it includes the pad buffer. |
726 | **/ |
727 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) |
728 | { |
729 | if (mask > q->dma_pad_mask) |
730 | q->dma_pad_mask = mask; |
731 | } |
732 | EXPORT_SYMBOL(blk_queue_update_dma_pad); |
733 | |
734 | /** |
735 | * blk_queue_segment_boundary - set boundary rules for segment merging |
736 | * @q: the request queue for the device |
737 | * @mask: the memory boundary mask |
738 | **/ |
739 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) |
740 | { |
741 | if (mask < PAGE_SIZE - 1) { |
742 | mask = PAGE_SIZE - 1; |
743 | printk(KERN_INFO "%s: set to minimum %lx\n" , |
744 | __func__, mask); |
745 | } |
746 | |
747 | q->limits.seg_boundary_mask = mask; |
748 | } |
749 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
750 | |
751 | /** |
752 | * blk_queue_virt_boundary - set boundary rules for bio merging |
753 | * @q: the request queue for the device |
754 | * @mask: the memory boundary mask |
755 | **/ |
756 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) |
757 | { |
758 | q->limits.virt_boundary_mask = mask; |
759 | |
760 | /* |
761 | * Devices that require a virtual boundary do not support scatter/gather |
762 | * I/O natively, but instead require a descriptor list entry for each |
763 | * page (which might not be idential to the Linux PAGE_SIZE). Because |
764 | * of that they are not limited by our notion of "segment size". |
765 | */ |
766 | if (mask) |
767 | q->limits.max_segment_size = UINT_MAX; |
768 | } |
769 | EXPORT_SYMBOL(blk_queue_virt_boundary); |
770 | |
771 | /** |
772 | * blk_queue_dma_alignment - set dma length and memory alignment |
773 | * @q: the request queue for the device |
774 | * @mask: alignment mask |
775 | * |
776 | * description: |
777 | * set required memory and length alignment for direct dma transactions. |
778 | * this is used when building direct io requests for the queue. |
779 | * |
780 | **/ |
781 | void blk_queue_dma_alignment(struct request_queue *q, int mask) |
782 | { |
783 | q->limits.dma_alignment = mask; |
784 | } |
785 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
786 | |
787 | /** |
788 | * blk_queue_update_dma_alignment - update dma length and memory alignment |
789 | * @q: the request queue for the device |
790 | * @mask: alignment mask |
791 | * |
792 | * description: |
793 | * update required memory and length alignment for direct dma transactions. |
794 | * If the requested alignment is larger than the current alignment, then |
795 | * the current queue alignment is updated to the new value, otherwise it |
796 | * is left alone. The design of this is to allow multiple objects |
797 | * (driver, device, transport etc) to set their respective |
798 | * alignments without having them interfere. |
799 | * |
800 | **/ |
801 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) |
802 | { |
803 | BUG_ON(mask > PAGE_SIZE); |
804 | |
805 | if (mask > q->limits.dma_alignment) |
806 | q->limits.dma_alignment = mask; |
807 | } |
808 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
809 | |
810 | /** |
811 | * blk_set_queue_depth - tell the block layer about the device queue depth |
812 | * @q: the request queue for the device |
813 | * @depth: queue depth |
814 | * |
815 | */ |
816 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) |
817 | { |
818 | q->queue_depth = depth; |
819 | rq_qos_queue_depth_changed(q); |
820 | } |
821 | EXPORT_SYMBOL(blk_set_queue_depth); |
822 | |
823 | /** |
824 | * blk_queue_write_cache - configure queue's write cache |
825 | * @q: the request queue for the device |
826 | * @wc: write back cache on or off |
827 | * @fua: device supports FUA writes, if true |
828 | * |
829 | * Tell the block layer about the write cache of @q. |
830 | */ |
831 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) |
832 | { |
833 | if (wc) { |
834 | blk_queue_flag_set(QUEUE_FLAG_HW_WC, q); |
835 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
836 | } else { |
837 | blk_queue_flag_clear(QUEUE_FLAG_HW_WC, q); |
838 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
839 | } |
840 | if (fua) |
841 | blk_queue_flag_set(QUEUE_FLAG_FUA, q); |
842 | else |
843 | blk_queue_flag_clear(QUEUE_FLAG_FUA, q); |
844 | |
845 | wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); |
846 | } |
847 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); |
848 | |
849 | /** |
850 | * blk_queue_required_elevator_features - Set a queue required elevator features |
851 | * @q: the request queue for the target device |
852 | * @features: Required elevator features OR'ed together |
853 | * |
854 | * Tell the block layer that for the device controlled through @q, only the |
855 | * only elevators that can be used are those that implement at least the set of |
856 | * features specified by @features. |
857 | */ |
858 | void blk_queue_required_elevator_features(struct request_queue *q, |
859 | unsigned int features) |
860 | { |
861 | q->required_elevator_features = features; |
862 | } |
863 | EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); |
864 | |
865 | /** |
866 | * blk_queue_can_use_dma_map_merging - configure queue for merging segments. |
867 | * @q: the request queue for the device |
868 | * @dev: the device pointer for dma |
869 | * |
870 | * Tell the block layer about merging the segments by dma map of @q. |
871 | */ |
872 | bool blk_queue_can_use_dma_map_merging(struct request_queue *q, |
873 | struct device *dev) |
874 | { |
875 | unsigned long boundary = dma_get_merge_boundary(dev); |
876 | |
877 | if (!boundary) |
878 | return false; |
879 | |
880 | /* No need to update max_segment_size. see blk_queue_virt_boundary() */ |
881 | blk_queue_virt_boundary(q, boundary); |
882 | |
883 | return true; |
884 | } |
885 | EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); |
886 | |
887 | static bool disk_has_partitions(struct gendisk *disk) |
888 | { |
889 | unsigned long idx; |
890 | struct block_device *part; |
891 | bool ret = false; |
892 | |
893 | rcu_read_lock(); |
894 | xa_for_each(&disk->part_tbl, idx, part) { |
895 | if (bdev_is_partition(bdev: part)) { |
896 | ret = true; |
897 | break; |
898 | } |
899 | } |
900 | rcu_read_unlock(); |
901 | |
902 | return ret; |
903 | } |
904 | |
905 | /** |
906 | * disk_set_zoned - configure the zoned model for a disk |
907 | * @disk: the gendisk of the queue to configure |
908 | * @model: the zoned model to set |
909 | * |
910 | * Set the zoned model of @disk to @model. |
911 | * |
912 | * When @model is BLK_ZONED_HM (host managed), this should be called only |
913 | * if zoned block device support is enabled (CONFIG_BLK_DEV_ZONED option). |
914 | * If @model specifies BLK_ZONED_HA (host aware), the effective model used |
915 | * depends on CONFIG_BLK_DEV_ZONED settings and on the existence of partitions |
916 | * on the disk. |
917 | */ |
918 | void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model) |
919 | { |
920 | struct request_queue *q = disk->queue; |
921 | unsigned int old_model = q->limits.zoned; |
922 | |
923 | switch (model) { |
924 | case BLK_ZONED_HM: |
925 | /* |
926 | * Host managed devices are supported only if |
927 | * CONFIG_BLK_DEV_ZONED is enabled. |
928 | */ |
929 | WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)); |
930 | break; |
931 | case BLK_ZONED_HA: |
932 | /* |
933 | * Host aware devices can be treated either as regular block |
934 | * devices (similar to drive managed devices) or as zoned block |
935 | * devices to take advantage of the zone command set, similarly |
936 | * to host managed devices. We try the latter if there are no |
937 | * partitions and zoned block device support is enabled, else |
938 | * we do nothing special as far as the block layer is concerned. |
939 | */ |
940 | if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED) || |
941 | disk_has_partitions(disk)) |
942 | model = BLK_ZONED_NONE; |
943 | break; |
944 | case BLK_ZONED_NONE: |
945 | default: |
946 | if (WARN_ON_ONCE(model != BLK_ZONED_NONE)) |
947 | model = BLK_ZONED_NONE; |
948 | break; |
949 | } |
950 | |
951 | q->limits.zoned = model; |
952 | if (model != BLK_ZONED_NONE) { |
953 | /* |
954 | * Set the zone write granularity to the device logical block |
955 | * size by default. The driver can change this value if needed. |
956 | */ |
957 | blk_queue_zone_write_granularity(q, |
958 | queue_logical_block_size(q)); |
959 | } else if (old_model != BLK_ZONED_NONE) { |
960 | disk_clear_zone_settings(disk); |
961 | } |
962 | } |
963 | EXPORT_SYMBOL_GPL(disk_set_zoned); |
964 | |
965 | int bdev_alignment_offset(struct block_device *bdev) |
966 | { |
967 | struct request_queue *q = bdev_get_queue(bdev); |
968 | |
969 | if (q->limits.misaligned) |
970 | return -1; |
971 | if (bdev_is_partition(bdev)) |
972 | return queue_limit_alignment_offset(lim: &q->limits, |
973 | sector: bdev->bd_start_sect); |
974 | return q->limits.alignment_offset; |
975 | } |
976 | EXPORT_SYMBOL_GPL(bdev_alignment_offset); |
977 | |
978 | unsigned int bdev_discard_alignment(struct block_device *bdev) |
979 | { |
980 | struct request_queue *q = bdev_get_queue(bdev); |
981 | |
982 | if (bdev_is_partition(bdev)) |
983 | return queue_limit_discard_alignment(lim: &q->limits, |
984 | sector: bdev->bd_start_sect); |
985 | return q->limits.discard_alignment; |
986 | } |
987 | EXPORT_SYMBOL_GPL(bdev_discard_alignment); |
988 | |