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3dcf60bc | 1 | // SPDX-License-Identifier: GPL-2.0 |
86db1e29 JA |
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> | |
4ee60ec1 | 10 | #include <linux/pagemap.h> |
edb0872f | 11 | #include <linux/backing-dev-defs.h> |
70dd5bf3 | 12 | #include <linux/gcd.h> |
2cda2728 | 13 | #include <linux/lcm.h> |
ad5ebd2f | 14 | #include <linux/jiffies.h> |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
45147fb5 | 16 | #include <linux/dma-mapping.h> |
86db1e29 JA |
17 | |
18 | #include "blk.h" | |
0bc65bd4 | 19 | #include "blk-rq-qos.h" |
87760e5e | 20 | #include "blk-wbt.h" |
86db1e29 | 21 | |
242f9dcb JA |
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 | ||
b1bd055d MP |
28 | /** |
29 | * blk_set_stacking_limits - set default limits for stacking devices | |
30 | * @lim: the queue_limits structure to reset | |
31 | * | |
c490f226 CH |
32 | * Prepare queue limits for applying limits from underlying devices using |
33 | * blk_stack_limits(). | |
b1bd055d MP |
34 | */ |
35 | void blk_set_stacking_limits(struct queue_limits *lim) | |
36 | { | |
c490f226 CH |
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; | |
b1bd055d MP |
44 | |
45 | /* Inherit limits from component devices */ | |
b1bd055d | 46 | lim->max_segments = USHRT_MAX; |
42c9cdfe | 47 | lim->max_discard_segments = USHRT_MAX; |
b1bd055d | 48 | lim->max_hw_sectors = UINT_MAX; |
d82ae52e | 49 | lim->max_segment_size = UINT_MAX; |
fe86cdce | 50 | lim->max_sectors = UINT_MAX; |
ca369d51 | 51 | lim->max_dev_sectors = UINT_MAX; |
a6f0788e | 52 | lim->max_write_zeroes_sectors = UINT_MAX; |
0512a75b | 53 | lim->max_zone_append_sectors = UINT_MAX; |
4f563a64 | 54 | lim->max_user_discard_sectors = UINT_MAX; |
b1bd055d MP |
55 | } |
56 | EXPORT_SYMBOL(blk_set_stacking_limits); | |
57 | ||
b9947297 CH |
58 | static void 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 ahead | |
63 | * 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 | ||
d690cb8a CH |
69 | static int blk_validate_zoned_limits(struct queue_limits *lim) |
70 | { | |
71 | if (!lim->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 | if (lim->zone_write_granularity < lim->logical_block_size) | |
84 | lim->zone_write_granularity = lim->logical_block_size; | |
85 | ||
86 | if (lim->max_zone_append_sectors) { | |
87 | /* | |
88 | * The Zone Append size is limited by the maximum I/O size | |
89 | * and the zone size given that it can't span zones. | |
90 | */ | |
91 | lim->max_zone_append_sectors = | |
92 | min3(lim->max_hw_sectors, | |
93 | lim->max_zone_append_sectors, | |
94 | lim->chunk_sectors); | |
95 | } | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Check that the limits in lim are valid, initialize defaults for unset | |
102 | * values, and cap values based on others where needed. | |
103 | */ | |
104 | static int blk_validate_limits(struct queue_limits *lim) | |
105 | { | |
106 | unsigned int max_hw_sectors; | |
107 | ||
108 | /* | |
109 | * Unless otherwise specified, default to 512 byte logical blocks and a | |
110 | * physical block size equal to the logical block size. | |
111 | */ | |
112 | if (!lim->logical_block_size) | |
113 | lim->logical_block_size = SECTOR_SIZE; | |
114 | if (lim->physical_block_size < lim->logical_block_size) | |
115 | lim->physical_block_size = lim->logical_block_size; | |
116 | ||
117 | /* | |
118 | * The minimum I/O size defaults to the physical block size unless | |
119 | * explicitly overridden. | |
120 | */ | |
121 | if (lim->io_min < lim->physical_block_size) | |
122 | lim->io_min = lim->physical_block_size; | |
123 | ||
124 | /* | |
125 | * max_hw_sectors has a somewhat weird default for historical reason, | |
126 | * but driver really should set their own instead of relying on this | |
127 | * value. | |
128 | * | |
129 | * The block layer relies on the fact that every driver can | |
130 | * handle at lest a page worth of data per I/O, and needs the value | |
131 | * aligned to the logical block size. | |
132 | */ | |
133 | if (!lim->max_hw_sectors) | |
134 | lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; | |
135 | if (WARN_ON_ONCE(lim->max_hw_sectors < PAGE_SECTORS)) | |
136 | return -EINVAL; | |
137 | lim->max_hw_sectors = round_down(lim->max_hw_sectors, | |
138 | lim->logical_block_size >> SECTOR_SHIFT); | |
139 | ||
140 | /* | |
141 | * The actual max_sectors value is a complex beast and also takes the | |
142 | * max_dev_sectors value (set by SCSI ULPs) and a user configurable | |
143 | * value into account. The ->max_sectors value is always calculated | |
144 | * from these, so directly setting it won't have any effect. | |
145 | */ | |
146 | max_hw_sectors = min_not_zero(lim->max_hw_sectors, | |
147 | lim->max_dev_sectors); | |
148 | if (lim->max_user_sectors) { | |
149 | if (lim->max_user_sectors > max_hw_sectors || | |
150 | lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE) | |
151 | return -EINVAL; | |
152 | lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors); | |
153 | } else { | |
154 | lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP); | |
155 | } | |
156 | lim->max_sectors = round_down(lim->max_sectors, | |
157 | lim->logical_block_size >> SECTOR_SHIFT); | |
158 | ||
159 | /* | |
160 | * Random default for the maximum number of segments. Driver should not | |
161 | * rely on this and set their own. | |
162 | */ | |
163 | if (!lim->max_segments) | |
164 | lim->max_segments = BLK_MAX_SEGMENTS; | |
165 | ||
4f563a64 CH |
166 | lim->max_discard_sectors = |
167 | min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors); | |
168 | ||
d690cb8a CH |
169 | if (!lim->max_discard_segments) |
170 | lim->max_discard_segments = 1; | |
171 | ||
172 | if (lim->discard_granularity < lim->physical_block_size) | |
173 | lim->discard_granularity = lim->physical_block_size; | |
174 | ||
175 | /* | |
176 | * By default there is no limit on the segment boundary alignment, | |
177 | * but if there is one it can't be smaller than the page size as | |
178 | * that would break all the normal I/O patterns. | |
179 | */ | |
180 | if (!lim->seg_boundary_mask) | |
181 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; | |
182 | if (WARN_ON_ONCE(lim->seg_boundary_mask < PAGE_SIZE - 1)) | |
183 | return -EINVAL; | |
184 | ||
d690cb8a CH |
185 | /* |
186 | * Devices that require a virtual boundary do not support scatter/gather | |
187 | * I/O natively, but instead require a descriptor list entry for each | |
188 | * page (which might not be identical to the Linux PAGE_SIZE). Because | |
189 | * of that they are not limited by our notion of "segment size". | |
190 | */ | |
191 | if (lim->virt_boundary_mask) { | |
192 | if (WARN_ON_ONCE(lim->max_segment_size && | |
193 | lim->max_segment_size != UINT_MAX)) | |
194 | return -EINVAL; | |
195 | lim->max_segment_size = UINT_MAX; | |
a3911966 CH |
196 | } else { |
197 | /* | |
198 | * The maximum segment size has an odd historic 64k default that | |
199 | * drivers probably should override. Just like the I/O size we | |
200 | * require drivers to at least handle a full page per segment. | |
201 | */ | |
202 | if (!lim->max_segment_size) | |
203 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; | |
204 | if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE)) | |
205 | return -EINVAL; | |
d690cb8a CH |
206 | } |
207 | ||
208 | /* | |
209 | * We require drivers to at least do logical block aligned I/O, but | |
210 | * historically could not check for that due to the separate calls | |
211 | * to set the limits. Once the transition is finished the check | |
212 | * below should be narrowed down to check the logical block size. | |
213 | */ | |
214 | if (!lim->dma_alignment) | |
215 | lim->dma_alignment = SECTOR_SIZE - 1; | |
216 | if (WARN_ON_ONCE(lim->dma_alignment > PAGE_SIZE)) | |
217 | return -EINVAL; | |
218 | ||
219 | if (lim->alignment_offset) { | |
220 | lim->alignment_offset &= (lim->physical_block_size - 1); | |
221 | lim->misaligned = 0; | |
222 | } | |
223 | ||
224 | return blk_validate_zoned_limits(lim); | |
225 | } | |
226 | ||
227 | /* | |
228 | * Set the default limits for a newly allocated queue. @lim contains the | |
229 | * initial limits set by the driver, which could be no limit in which case | |
230 | * all fields are cleared to zero. | |
231 | */ | |
232 | int blk_set_default_limits(struct queue_limits *lim) | |
233 | { | |
4f563a64 CH |
234 | /* |
235 | * Most defaults are set by capping the bounds in blk_validate_limits, | |
236 | * but max_user_discard_sectors is special and needs an explicit | |
237 | * initialization to the max value here. | |
238 | */ | |
239 | lim->max_user_discard_sectors = UINT_MAX; | |
d690cb8a CH |
240 | return blk_validate_limits(lim); |
241 | } | |
242 | ||
243 | /** | |
244 | * queue_limits_commit_update - commit an atomic update of queue limits | |
245 | * @q: queue to update | |
246 | * @lim: limits to apply | |
247 | * | |
248 | * Apply the limits in @lim that were obtained from queue_limits_start_update() | |
249 | * and updated by the caller to @q. | |
250 | * | |
251 | * Returns 0 if successful, else a negative error code. | |
252 | */ | |
253 | int queue_limits_commit_update(struct request_queue *q, | |
254 | struct queue_limits *lim) | |
255 | __releases(q->limits_lock) | |
256 | { | |
257 | int error = blk_validate_limits(lim); | |
258 | ||
259 | if (!error) { | |
260 | q->limits = *lim; | |
261 | if (q->disk) | |
262 | blk_apply_bdi_limits(q->disk->bdi, lim); | |
263 | } | |
264 | mutex_unlock(&q->limits_lock); | |
265 | return error; | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(queue_limits_commit_update); | |
268 | ||
631d4efb | 269 | /** |
4c4ab8ae | 270 | * queue_limits_set - apply queue limits to queue |
631d4efb CH |
271 | * @q: queue to update |
272 | * @lim: limits to apply | |
273 | * | |
274 | * Apply the limits in @lim that were freshly initialized to @q. | |
275 | * To update existing limits use queue_limits_start_update() and | |
276 | * queue_limits_commit_update() instead. | |
277 | * | |
278 | * Returns 0 if successful, else a negative error code. | |
279 | */ | |
280 | int queue_limits_set(struct request_queue *q, struct queue_limits *lim) | |
281 | { | |
282 | mutex_lock(&q->limits_lock); | |
283 | return queue_limits_commit_update(q, lim); | |
284 | } | |
285 | EXPORT_SYMBOL_GPL(queue_limits_set); | |
286 | ||
86db1e29 JA |
287 | /** |
288 | * blk_queue_bounce_limit - set bounce buffer limit for queue | |
cd0aca2d | 289 | * @q: the request queue for the device |
9bb33f24 | 290 | * @bounce: bounce limit to enforce |
86db1e29 JA |
291 | * |
292 | * Description: | |
9bb33f24 CH |
293 | * Force bouncing for ISA DMA ranges or highmem. |
294 | * | |
295 | * DEPRECATED, don't use in new code. | |
86db1e29 | 296 | **/ |
9bb33f24 | 297 | void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce) |
86db1e29 | 298 | { |
9bb33f24 | 299 | q->limits.bounce = bounce; |
86db1e29 | 300 | } |
86db1e29 JA |
301 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
302 | ||
303 | /** | |
ca369d51 MP |
304 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
305 | * @q: the request queue for the device | |
2800aac1 | 306 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
86db1e29 JA |
307 | * |
308 | * Description: | |
2800aac1 MP |
309 | * Enables a low level driver to set a hard upper limit, |
310 | * max_hw_sectors, on the size of requests. max_hw_sectors is set by | |
4f258a46 MP |
311 | * the device driver based upon the capabilities of the I/O |
312 | * controller. | |
2800aac1 | 313 | * |
ca369d51 MP |
314 | * max_dev_sectors is a hard limit imposed by the storage device for |
315 | * READ/WRITE requests. It is set by the disk driver. | |
316 | * | |
2800aac1 MP |
317 | * max_sectors is a soft limit imposed by the block layer for |
318 | * filesystem type requests. This value can be overridden on a | |
319 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. | |
320 | * The soft limit can not exceed max_hw_sectors. | |
86db1e29 | 321 | **/ |
ca369d51 | 322 | void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
86db1e29 | 323 | { |
ca369d51 MP |
324 | struct queue_limits *limits = &q->limits; |
325 | unsigned int max_sectors; | |
326 | ||
09cbfeaf KS |
327 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
328 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); | |
f19d1e3b | 329 | pr_info("%s: set to minimum %u\n", __func__, max_hw_sectors); |
86db1e29 JA |
330 | } |
331 | ||
817046ec DLM |
332 | max_hw_sectors = round_down(max_hw_sectors, |
333 | limits->logical_block_size >> SECTOR_SHIFT); | |
30e2bc08 | 334 | limits->max_hw_sectors = max_hw_sectors; |
817046ec | 335 | |
ca369d51 | 336 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
c9c77418 KB |
337 | |
338 | if (limits->max_user_sectors) | |
339 | max_sectors = min(max_sectors, limits->max_user_sectors); | |
340 | else | |
d6b9f4e6 | 341 | max_sectors = min(max_sectors, BLK_DEF_MAX_SECTORS_CAP); |
c9c77418 | 342 | |
817046ec DLM |
343 | max_sectors = round_down(max_sectors, |
344 | limits->logical_block_size >> SECTOR_SHIFT); | |
ca369d51 | 345 | limits->max_sectors = max_sectors; |
817046ec | 346 | |
d152c682 | 347 | if (!q->disk) |
edb0872f | 348 | return; |
d152c682 | 349 | q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
86db1e29 | 350 | } |
086fa5ff | 351 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
86db1e29 | 352 | |
762380ad JA |
353 | /** |
354 | * blk_queue_chunk_sectors - set size of the chunk for this queue | |
355 | * @q: the request queue for the device | |
356 | * @chunk_sectors: chunk sectors in the usual 512b unit | |
357 | * | |
358 | * Description: | |
359 | * If a driver doesn't want IOs to cross a given chunk size, it can set | |
07d098e6 MS |
360 | * this limit and prevent merging across chunks. Note that the block layer |
361 | * must accept a page worth of data at any offset. So if the crossing of | |
362 | * chunks is a hard limitation in the driver, it must still be prepared | |
363 | * to split single page bios. | |
762380ad JA |
364 | **/ |
365 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) | |
366 | { | |
762380ad JA |
367 | q->limits.chunk_sectors = chunk_sectors; |
368 | } | |
369 | EXPORT_SYMBOL(blk_queue_chunk_sectors); | |
370 | ||
67efc925 CH |
371 | /** |
372 | * blk_queue_max_discard_sectors - set max sectors for a single discard | |
373 | * @q: the request queue for the device | |
c7ebf065 | 374 | * @max_discard_sectors: maximum number of sectors to discard |
67efc925 CH |
375 | **/ |
376 | void blk_queue_max_discard_sectors(struct request_queue *q, | |
377 | unsigned int max_discard_sectors) | |
378 | { | |
4f563a64 CH |
379 | struct queue_limits *lim = &q->limits; |
380 | ||
381 | lim->max_hw_discard_sectors = max_discard_sectors; | |
382 | lim->max_discard_sectors = | |
383 | min(max_discard_sectors, lim->max_user_discard_sectors); | |
67efc925 CH |
384 | } |
385 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); | |
386 | ||
44abff2c CH |
387 | /** |
388 | * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase | |
389 | * @q: the request queue for the device | |
390 | * @max_sectors: maximum number of sectors to secure_erase | |
391 | **/ | |
392 | void blk_queue_max_secure_erase_sectors(struct request_queue *q, | |
393 | unsigned int max_sectors) | |
394 | { | |
395 | q->limits.max_secure_erase_sectors = max_sectors; | |
396 | } | |
397 | EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors); | |
398 | ||
a6f0788e CK |
399 | /** |
400 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single | |
401 | * write zeroes | |
402 | * @q: the request queue for the device | |
403 | * @max_write_zeroes_sectors: maximum number of sectors to write per command | |
404 | **/ | |
405 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, | |
406 | unsigned int max_write_zeroes_sectors) | |
407 | { | |
408 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; | |
409 | } | |
410 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); | |
411 | ||
0512a75b KB |
412 | /** |
413 | * blk_queue_max_zone_append_sectors - set max sectors for a single zone append | |
414 | * @q: the request queue for the device | |
415 | * @max_zone_append_sectors: maximum number of sectors to write per command | |
416 | **/ | |
417 | void blk_queue_max_zone_append_sectors(struct request_queue *q, | |
418 | unsigned int max_zone_append_sectors) | |
419 | { | |
420 | unsigned int max_sectors; | |
421 | ||
422 | if (WARN_ON(!blk_queue_is_zoned(q))) | |
423 | return; | |
424 | ||
425 | max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors); | |
426 | max_sectors = min(q->limits.chunk_sectors, max_sectors); | |
427 | ||
428 | /* | |
429 | * Signal eventual driver bugs resulting in the max_zone_append sectors limit | |
430 | * being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set, | |
431 | * or the max_hw_sectors limit not set. | |
432 | */ | |
433 | WARN_ON(!max_sectors); | |
434 | ||
435 | q->limits.max_zone_append_sectors = max_sectors; | |
436 | } | |
437 | EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors); | |
438 | ||
86db1e29 | 439 | /** |
8a78362c | 440 | * blk_queue_max_segments - set max hw segments for a request for this queue |
86db1e29 JA |
441 | * @q: the request queue for the device |
442 | * @max_segments: max number of segments | |
443 | * | |
444 | * Description: | |
445 | * Enables a low level driver to set an upper limit on the number of | |
8a78362c | 446 | * hw data segments in a request. |
86db1e29 | 447 | **/ |
8a78362c | 448 | void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
86db1e29 JA |
449 | { |
450 | if (!max_segments) { | |
451 | max_segments = 1; | |
f19d1e3b | 452 | pr_info("%s: set to minimum %u\n", __func__, max_segments); |
86db1e29 JA |
453 | } |
454 | ||
8a78362c | 455 | q->limits.max_segments = max_segments; |
86db1e29 | 456 | } |
8a78362c | 457 | EXPORT_SYMBOL(blk_queue_max_segments); |
86db1e29 | 458 | |
1e739730 CH |
459 | /** |
460 | * blk_queue_max_discard_segments - set max segments for discard requests | |
461 | * @q: the request queue for the device | |
462 | * @max_segments: max number of segments | |
463 | * | |
464 | * Description: | |
465 | * Enables a low level driver to set an upper limit on the number of | |
466 | * segments in a discard request. | |
467 | **/ | |
468 | void blk_queue_max_discard_segments(struct request_queue *q, | |
469 | unsigned short max_segments) | |
470 | { | |
471 | q->limits.max_discard_segments = max_segments; | |
472 | } | |
473 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); | |
474 | ||
86db1e29 JA |
475 | /** |
476 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg | |
477 | * @q: the request queue for the device | |
478 | * @max_size: max size of segment in bytes | |
479 | * | |
480 | * Description: | |
481 | * Enables a low level driver to set an upper limit on the size of a | |
482 | * coalesced segment | |
483 | **/ | |
484 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) | |
485 | { | |
09cbfeaf KS |
486 | if (max_size < PAGE_SIZE) { |
487 | max_size = PAGE_SIZE; | |
f19d1e3b | 488 | pr_info("%s: set to minimum %u\n", __func__, max_size); |
86db1e29 JA |
489 | } |
490 | ||
09324d32 CH |
491 | /* see blk_queue_virt_boundary() for the explanation */ |
492 | WARN_ON_ONCE(q->limits.virt_boundary_mask); | |
493 | ||
025146e1 | 494 | q->limits.max_segment_size = max_size; |
86db1e29 | 495 | } |
86db1e29 JA |
496 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
497 | ||
498 | /** | |
e1defc4f | 499 | * blk_queue_logical_block_size - set logical block size for the queue |
86db1e29 | 500 | * @q: the request queue for the device |
e1defc4f | 501 | * @size: the logical block size, in bytes |
86db1e29 JA |
502 | * |
503 | * Description: | |
e1defc4f MP |
504 | * This should be set to the lowest possible block size that the |
505 | * storage device can address. The default of 512 covers most | |
506 | * hardware. | |
86db1e29 | 507 | **/ |
ad6bf88a | 508 | void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) |
86db1e29 | 509 | { |
817046ec DLM |
510 | struct queue_limits *limits = &q->limits; |
511 | ||
512 | limits->logical_block_size = size; | |
513 | ||
3c407dc7 CH |
514 | if (limits->discard_granularity < limits->logical_block_size) |
515 | limits->discard_granularity = limits->logical_block_size; | |
516 | ||
817046ec DLM |
517 | if (limits->physical_block_size < size) |
518 | limits->physical_block_size = size; | |
c72758f3 | 519 | |
817046ec DLM |
520 | if (limits->io_min < limits->physical_block_size) |
521 | limits->io_min = limits->physical_block_size; | |
c72758f3 | 522 | |
817046ec DLM |
523 | limits->max_hw_sectors = |
524 | round_down(limits->max_hw_sectors, size >> SECTOR_SHIFT); | |
525 | limits->max_sectors = | |
526 | round_down(limits->max_sectors, size >> SECTOR_SHIFT); | |
86db1e29 | 527 | } |
e1defc4f | 528 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
86db1e29 | 529 | |
c72758f3 MP |
530 | /** |
531 | * blk_queue_physical_block_size - set physical block size for the queue | |
532 | * @q: the request queue for the device | |
533 | * @size: the physical block size, in bytes | |
534 | * | |
535 | * Description: | |
536 | * This should be set to the lowest possible sector size that the | |
537 | * hardware can operate on without reverting to read-modify-write | |
538 | * operations. | |
539 | */ | |
892b6f90 | 540 | void blk_queue_physical_block_size(struct request_queue *q, unsigned int size) |
c72758f3 MP |
541 | { |
542 | q->limits.physical_block_size = size; | |
543 | ||
544 | if (q->limits.physical_block_size < q->limits.logical_block_size) | |
545 | q->limits.physical_block_size = q->limits.logical_block_size; | |
546 | ||
458aa1a0 CH |
547 | if (q->limits.discard_granularity < q->limits.physical_block_size) |
548 | q->limits.discard_granularity = q->limits.physical_block_size; | |
549 | ||
c72758f3 MP |
550 | if (q->limits.io_min < q->limits.physical_block_size) |
551 | q->limits.io_min = q->limits.physical_block_size; | |
552 | } | |
553 | EXPORT_SYMBOL(blk_queue_physical_block_size); | |
554 | ||
a805a4fa DLM |
555 | /** |
556 | * blk_queue_zone_write_granularity - set zone write granularity for the queue | |
557 | * @q: the request queue for the zoned device | |
558 | * @size: the zone write granularity size, in bytes | |
559 | * | |
560 | * Description: | |
561 | * This should be set to the lowest possible size allowing to write in | |
562 | * sequential zones of a zoned block device. | |
563 | */ | |
564 | void blk_queue_zone_write_granularity(struct request_queue *q, | |
565 | unsigned int size) | |
566 | { | |
567 | if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) | |
568 | return; | |
569 | ||
570 | q->limits.zone_write_granularity = size; | |
571 | ||
572 | if (q->limits.zone_write_granularity < q->limits.logical_block_size) | |
573 | q->limits.zone_write_granularity = q->limits.logical_block_size; | |
574 | } | |
575 | EXPORT_SYMBOL_GPL(blk_queue_zone_write_granularity); | |
576 | ||
c72758f3 MP |
577 | /** |
578 | * blk_queue_alignment_offset - set physical block alignment offset | |
579 | * @q: the request queue for the device | |
8ebf9756 | 580 | * @offset: alignment offset in bytes |
c72758f3 MP |
581 | * |
582 | * Description: | |
583 | * Some devices are naturally misaligned to compensate for things like | |
584 | * the legacy DOS partition table 63-sector offset. Low-level drivers | |
585 | * should call this function for devices whose first sector is not | |
586 | * naturally aligned. | |
587 | */ | |
588 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) | |
589 | { | |
590 | q->limits.alignment_offset = | |
591 | offset & (q->limits.physical_block_size - 1); | |
592 | q->limits.misaligned = 0; | |
593 | } | |
594 | EXPORT_SYMBOL(blk_queue_alignment_offset); | |
595 | ||
471aa704 | 596 | void disk_update_readahead(struct gendisk *disk) |
c2e4cd57 | 597 | { |
b9947297 | 598 | blk_apply_bdi_limits(disk->bdi, &disk->queue->limits); |
c2e4cd57 | 599 | } |
471aa704 | 600 | EXPORT_SYMBOL_GPL(disk_update_readahead); |
c2e4cd57 | 601 | |
7c958e32 MP |
602 | /** |
603 | * blk_limits_io_min - set minimum request size for a device | |
604 | * @limits: the queue limits | |
605 | * @min: smallest I/O size in bytes | |
606 | * | |
607 | * Description: | |
608 | * Some devices have an internal block size bigger than the reported | |
609 | * hardware sector size. This function can be used to signal the | |
610 | * smallest I/O the device can perform without incurring a performance | |
611 | * penalty. | |
612 | */ | |
613 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) | |
614 | { | |
615 | limits->io_min = min; | |
616 | ||
617 | if (limits->io_min < limits->logical_block_size) | |
618 | limits->io_min = limits->logical_block_size; | |
619 | ||
620 | if (limits->io_min < limits->physical_block_size) | |
621 | limits->io_min = limits->physical_block_size; | |
622 | } | |
623 | EXPORT_SYMBOL(blk_limits_io_min); | |
624 | ||
c72758f3 MP |
625 | /** |
626 | * blk_queue_io_min - set minimum request size for the queue | |
627 | * @q: the request queue for the device | |
8ebf9756 | 628 | * @min: smallest I/O size in bytes |
c72758f3 MP |
629 | * |
630 | * Description: | |
7e5f5fb0 MP |
631 | * Storage devices may report a granularity or preferred minimum I/O |
632 | * size which is the smallest request the device can perform without | |
633 | * incurring a performance penalty. For disk drives this is often the | |
634 | * physical block size. For RAID arrays it is often the stripe chunk | |
635 | * size. A properly aligned multiple of minimum_io_size is the | |
636 | * preferred request size for workloads where a high number of I/O | |
637 | * operations is desired. | |
c72758f3 MP |
638 | */ |
639 | void blk_queue_io_min(struct request_queue *q, unsigned int min) | |
640 | { | |
7c958e32 | 641 | blk_limits_io_min(&q->limits, min); |
c72758f3 MP |
642 | } |
643 | EXPORT_SYMBOL(blk_queue_io_min); | |
644 | ||
3c5820c7 MP |
645 | /** |
646 | * blk_limits_io_opt - set optimal request size for a device | |
647 | * @limits: the queue limits | |
648 | * @opt: smallest I/O size in bytes | |
649 | * | |
650 | * Description: | |
651 | * Storage devices may report an optimal I/O size, which is the | |
652 | * device's preferred unit for sustained I/O. This is rarely reported | |
653 | * for disk drives. For RAID arrays it is usually the stripe width or | |
654 | * the internal track size. A properly aligned multiple of | |
655 | * optimal_io_size is the preferred request size for workloads where | |
656 | * sustained throughput is desired. | |
657 | */ | |
658 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) | |
659 | { | |
660 | limits->io_opt = opt; | |
661 | } | |
662 | EXPORT_SYMBOL(blk_limits_io_opt); | |
663 | ||
c72758f3 MP |
664 | /** |
665 | * blk_queue_io_opt - set optimal request size for the queue | |
666 | * @q: the request queue for the device | |
8ebf9756 | 667 | * @opt: optimal request size in bytes |
c72758f3 MP |
668 | * |
669 | * Description: | |
7e5f5fb0 MP |
670 | * Storage devices may report an optimal I/O size, which is the |
671 | * device's preferred unit for sustained I/O. This is rarely reported | |
672 | * for disk drives. For RAID arrays it is usually the stripe width or | |
673 | * the internal track size. A properly aligned multiple of | |
674 | * optimal_io_size is the preferred request size for workloads where | |
675 | * sustained throughput is desired. | |
c72758f3 MP |
676 | */ |
677 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) | |
678 | { | |
3c5820c7 | 679 | blk_limits_io_opt(&q->limits, opt); |
d152c682 | 680 | if (!q->disk) |
edb0872f | 681 | return; |
d152c682 | 682 | q->disk->bdi->ra_pages = |
c2e4cd57 | 683 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
c72758f3 MP |
684 | } |
685 | EXPORT_SYMBOL(blk_queue_io_opt); | |
686 | ||
aa261f20 | 687 | static int queue_limit_alignment_offset(const struct queue_limits *lim, |
89098b07 CH |
688 | sector_t sector) |
689 | { | |
690 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
691 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) | |
692 | << SECTOR_SHIFT; | |
693 | ||
694 | return (granularity + lim->alignment_offset - alignment) % granularity; | |
695 | } | |
696 | ||
aa261f20 BVA |
697 | static unsigned int queue_limit_discard_alignment( |
698 | const struct queue_limits *lim, sector_t sector) | |
5c4b4a5c CH |
699 | { |
700 | unsigned int alignment, granularity, offset; | |
701 | ||
702 | if (!lim->max_discard_sectors) | |
703 | return 0; | |
704 | ||
705 | /* Why are these in bytes, not sectors? */ | |
706 | alignment = lim->discard_alignment >> SECTOR_SHIFT; | |
707 | granularity = lim->discard_granularity >> SECTOR_SHIFT; | |
708 | if (!granularity) | |
709 | return 0; | |
710 | ||
711 | /* Offset of the partition start in 'granularity' sectors */ | |
712 | offset = sector_div(sector, granularity); | |
713 | ||
714 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
715 | offset = (granularity + alignment - offset) % granularity; | |
716 | ||
717 | /* Turn it back into bytes, gaah */ | |
718 | return offset << SECTOR_SHIFT; | |
719 | } | |
720 | ||
97f433c3 MP |
721 | static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs) |
722 | { | |
723 | sectors = round_down(sectors, lbs >> SECTOR_SHIFT); | |
724 | if (sectors < PAGE_SIZE >> SECTOR_SHIFT) | |
725 | sectors = PAGE_SIZE >> SECTOR_SHIFT; | |
726 | return sectors; | |
727 | } | |
728 | ||
c72758f3 MP |
729 | /** |
730 | * blk_stack_limits - adjust queue_limits for stacked devices | |
81744ee4 MP |
731 | * @t: the stacking driver limits (top device) |
732 | * @b: the underlying queue limits (bottom, component device) | |
e03a72e1 | 733 | * @start: first data sector within component device |
c72758f3 MP |
734 | * |
735 | * Description: | |
81744ee4 MP |
736 | * This function is used by stacking drivers like MD and DM to ensure |
737 | * that all component devices have compatible block sizes and | |
738 | * alignments. The stacking driver must provide a queue_limits | |
739 | * struct (top) and then iteratively call the stacking function for | |
740 | * all component (bottom) devices. The stacking function will | |
741 | * attempt to combine the values and ensure proper alignment. | |
742 | * | |
743 | * Returns 0 if the top and bottom queue_limits are compatible. The | |
744 | * top device's block sizes and alignment offsets may be adjusted to | |
745 | * ensure alignment with the bottom device. If no compatible sizes | |
746 | * and alignments exist, -1 is returned and the resulting top | |
747 | * queue_limits will have the misaligned flag set to indicate that | |
748 | * the alignment_offset is undefined. | |
c72758f3 MP |
749 | */ |
750 | int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, | |
e03a72e1 | 751 | sector_t start) |
c72758f3 | 752 | { |
e03a72e1 | 753 | unsigned int top, bottom, alignment, ret = 0; |
86b37281 | 754 | |
c72758f3 MP |
755 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
756 | t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); | |
ca369d51 | 757 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
a6f0788e CK |
758 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
759 | b->max_write_zeroes_sectors); | |
0512a75b KB |
760 | t->max_zone_append_sectors = min(t->max_zone_append_sectors, |
761 | b->max_zone_append_sectors); | |
9bb33f24 | 762 | t->bounce = max(t->bounce, b->bounce); |
c72758f3 MP |
763 | |
764 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, | |
765 | b->seg_boundary_mask); | |
03100aad KB |
766 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
767 | b->virt_boundary_mask); | |
c72758f3 | 768 | |
8a78362c | 769 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
1e739730 CH |
770 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
771 | b->max_discard_segments); | |
13f05c8d MP |
772 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
773 | b->max_integrity_segments); | |
c72758f3 MP |
774 | |
775 | t->max_segment_size = min_not_zero(t->max_segment_size, | |
776 | b->max_segment_size); | |
777 | ||
fe0b393f MP |
778 | t->misaligned |= b->misaligned; |
779 | ||
e03a72e1 | 780 | alignment = queue_limit_alignment_offset(b, start); |
9504e086 | 781 | |
81744ee4 MP |
782 | /* Bottom device has different alignment. Check that it is |
783 | * compatible with the current top alignment. | |
784 | */ | |
9504e086 MP |
785 | if (t->alignment_offset != alignment) { |
786 | ||
787 | top = max(t->physical_block_size, t->io_min) | |
788 | + t->alignment_offset; | |
81744ee4 | 789 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
9504e086 | 790 | |
81744ee4 | 791 | /* Verify that top and bottom intervals line up */ |
b8839b8c | 792 | if (max(top, bottom) % min(top, bottom)) { |
9504e086 | 793 | t->misaligned = 1; |
fe0b393f MP |
794 | ret = -1; |
795 | } | |
9504e086 MP |
796 | } |
797 | ||
c72758f3 MP |
798 | t->logical_block_size = max(t->logical_block_size, |
799 | b->logical_block_size); | |
800 | ||
801 | t->physical_block_size = max(t->physical_block_size, | |
802 | b->physical_block_size); | |
803 | ||
804 | t->io_min = max(t->io_min, b->io_min); | |
e9637415 | 805 | t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); |
c964d62f | 806 | t->dma_alignment = max(t->dma_alignment, b->dma_alignment); |
7e7986f9 MS |
807 | |
808 | /* Set non-power-of-2 compatible chunk_sectors boundary */ | |
809 | if (b->chunk_sectors) | |
810 | t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors); | |
9504e086 | 811 | |
81744ee4 | 812 | /* Physical block size a multiple of the logical block size? */ |
9504e086 MP |
813 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
814 | t->physical_block_size = t->logical_block_size; | |
c72758f3 | 815 | t->misaligned = 1; |
fe0b393f | 816 | ret = -1; |
86b37281 MP |
817 | } |
818 | ||
81744ee4 | 819 | /* Minimum I/O a multiple of the physical block size? */ |
9504e086 MP |
820 | if (t->io_min & (t->physical_block_size - 1)) { |
821 | t->io_min = t->physical_block_size; | |
822 | t->misaligned = 1; | |
fe0b393f | 823 | ret = -1; |
c72758f3 MP |
824 | } |
825 | ||
81744ee4 | 826 | /* Optimal I/O a multiple of the physical block size? */ |
9504e086 MP |
827 | if (t->io_opt & (t->physical_block_size - 1)) { |
828 | t->io_opt = 0; | |
829 | t->misaligned = 1; | |
fe0b393f | 830 | ret = -1; |
9504e086 | 831 | } |
c72758f3 | 832 | |
22ada802 MS |
833 | /* chunk_sectors a multiple of the physical block size? */ |
834 | if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) { | |
835 | t->chunk_sectors = 0; | |
836 | t->misaligned = 1; | |
837 | ret = -1; | |
838 | } | |
839 | ||
c78afc62 KO |
840 | t->raid_partial_stripes_expensive = |
841 | max(t->raid_partial_stripes_expensive, | |
842 | b->raid_partial_stripes_expensive); | |
843 | ||
81744ee4 | 844 | /* Find lowest common alignment_offset */ |
e9637415 | 845 | t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) |
b8839b8c | 846 | % max(t->physical_block_size, t->io_min); |
86b37281 | 847 | |
81744ee4 | 848 | /* Verify that new alignment_offset is on a logical block boundary */ |
fe0b393f | 849 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
c72758f3 | 850 | t->misaligned = 1; |
fe0b393f MP |
851 | ret = -1; |
852 | } | |
c72758f3 | 853 | |
97f433c3 MP |
854 | t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size); |
855 | t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size); | |
856 | t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size); | |
857 | ||
9504e086 MP |
858 | /* Discard alignment and granularity */ |
859 | if (b->discard_granularity) { | |
e03a72e1 | 860 | alignment = queue_limit_discard_alignment(b, start); |
9504e086 MP |
861 | |
862 | if (t->discard_granularity != 0 && | |
863 | t->discard_alignment != alignment) { | |
864 | top = t->discard_granularity + t->discard_alignment; | |
865 | bottom = b->discard_granularity + alignment; | |
70dd5bf3 | 866 | |
9504e086 | 867 | /* Verify that top and bottom intervals line up */ |
8dd2cb7e | 868 | if ((max(top, bottom) % min(top, bottom)) != 0) |
9504e086 MP |
869 | t->discard_misaligned = 1; |
870 | } | |
871 | ||
81744ee4 MP |
872 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
873 | b->max_discard_sectors); | |
0034af03 JA |
874 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
875 | b->max_hw_discard_sectors); | |
9504e086 MP |
876 | t->discard_granularity = max(t->discard_granularity, |
877 | b->discard_granularity); | |
e9637415 | 878 | t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % |
8dd2cb7e | 879 | t->discard_granularity; |
9504e086 | 880 | } |
44abff2c CH |
881 | t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors, |
882 | b->max_secure_erase_sectors); | |
a805a4fa DLM |
883 | t->zone_write_granularity = max(t->zone_write_granularity, |
884 | b->zone_write_granularity); | |
3093a479 | 885 | t->zoned = max(t->zoned, b->zoned); |
c8f6f88d DLM |
886 | if (!t->zoned) { |
887 | t->zone_write_granularity = 0; | |
888 | t->max_zone_append_sectors = 0; | |
889 | } | |
fe0b393f | 890 | return ret; |
c72758f3 | 891 | } |
5d85d324 | 892 | EXPORT_SYMBOL(blk_stack_limits); |
c72758f3 | 893 | |
c1373f1c CH |
894 | /** |
895 | * queue_limits_stack_bdev - adjust queue_limits for stacked devices | |
896 | * @t: the stacking driver limits (top device) | |
897 | * @bdev: the underlying block device (bottom) | |
898 | * @offset: offset to beginning of data within component device | |
899 | * @pfx: prefix to use for warnings logged | |
900 | * | |
901 | * Description: | |
902 | * This function is used by stacking drivers like MD and DM to ensure | |
903 | * that all component devices have compatible block sizes and | |
904 | * alignments. The stacking driver must provide a queue_limits | |
905 | * struct (top) and then iteratively call the stacking function for | |
906 | * all component (bottom) devices. The stacking function will | |
907 | * attempt to combine the values and ensure proper alignment. | |
908 | */ | |
909 | void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, | |
910 | sector_t offset, const char *pfx) | |
911 | { | |
912 | if (blk_stack_limits(t, &bdev_get_queue(bdev)->limits, | |
913 | get_start_sect(bdev) + offset)) | |
914 | pr_notice("%s: Warning: Device %pg is misaligned\n", | |
915 | pfx, bdev); | |
916 | } | |
917 | EXPORT_SYMBOL_GPL(queue_limits_stack_bdev); | |
918 | ||
27f8221a FT |
919 | /** |
920 | * blk_queue_update_dma_pad - update pad mask | |
921 | * @q: the request queue for the device | |
922 | * @mask: pad mask | |
923 | * | |
924 | * Update dma pad mask. | |
925 | * | |
926 | * Appending pad buffer to a request modifies the last entry of a | |
927 | * scatter list such that it includes the pad buffer. | |
928 | **/ | |
929 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) | |
930 | { | |
931 | if (mask > q->dma_pad_mask) | |
932 | q->dma_pad_mask = mask; | |
933 | } | |
934 | EXPORT_SYMBOL(blk_queue_update_dma_pad); | |
935 | ||
86db1e29 JA |
936 | /** |
937 | * blk_queue_segment_boundary - set boundary rules for segment merging | |
938 | * @q: the request queue for the device | |
939 | * @mask: the memory boundary mask | |
940 | **/ | |
941 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) | |
942 | { | |
09cbfeaf KS |
943 | if (mask < PAGE_SIZE - 1) { |
944 | mask = PAGE_SIZE - 1; | |
f19d1e3b | 945 | pr_info("%s: set to minimum %lx\n", __func__, mask); |
86db1e29 JA |
946 | } |
947 | ||
025146e1 | 948 | q->limits.seg_boundary_mask = mask; |
86db1e29 | 949 | } |
86db1e29 JA |
950 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
951 | ||
03100aad KB |
952 | /** |
953 | * blk_queue_virt_boundary - set boundary rules for bio merging | |
954 | * @q: the request queue for the device | |
955 | * @mask: the memory boundary mask | |
956 | **/ | |
957 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) | |
958 | { | |
959 | q->limits.virt_boundary_mask = mask; | |
09324d32 CH |
960 | |
961 | /* | |
962 | * Devices that require a virtual boundary do not support scatter/gather | |
963 | * I/O natively, but instead require a descriptor list entry for each | |
964 | * page (which might not be idential to the Linux PAGE_SIZE). Because | |
965 | * of that they are not limited by our notion of "segment size". | |
966 | */ | |
c6c84f78 CH |
967 | if (mask) |
968 | q->limits.max_segment_size = UINT_MAX; | |
03100aad KB |
969 | } |
970 | EXPORT_SYMBOL(blk_queue_virt_boundary); | |
971 | ||
86db1e29 JA |
972 | /** |
973 | * blk_queue_dma_alignment - set dma length and memory alignment | |
974 | * @q: the request queue for the device | |
975 | * @mask: alignment mask | |
976 | * | |
977 | * description: | |
710027a4 | 978 | * set required memory and length alignment for direct dma transactions. |
8feb4d20 | 979 | * this is used when building direct io requests for the queue. |
86db1e29 JA |
980 | * |
981 | **/ | |
982 | void blk_queue_dma_alignment(struct request_queue *q, int mask) | |
983 | { | |
c964d62f | 984 | q->limits.dma_alignment = mask; |
86db1e29 | 985 | } |
86db1e29 JA |
986 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
987 | ||
988 | /** | |
989 | * blk_queue_update_dma_alignment - update dma length and memory alignment | |
990 | * @q: the request queue for the device | |
991 | * @mask: alignment mask | |
992 | * | |
993 | * description: | |
710027a4 | 994 | * update required memory and length alignment for direct dma transactions. |
86db1e29 JA |
995 | * If the requested alignment is larger than the current alignment, then |
996 | * the current queue alignment is updated to the new value, otherwise it | |
997 | * is left alone. The design of this is to allow multiple objects | |
998 | * (driver, device, transport etc) to set their respective | |
999 | * alignments without having them interfere. | |
1000 | * | |
1001 | **/ | |
1002 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) | |
1003 | { | |
1004 | BUG_ON(mask > PAGE_SIZE); | |
1005 | ||
c964d62f KB |
1006 | if (mask > q->limits.dma_alignment) |
1007 | q->limits.dma_alignment = mask; | |
86db1e29 | 1008 | } |
86db1e29 JA |
1009 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
1010 | ||
d278d4a8 JA |
1011 | /** |
1012 | * blk_set_queue_depth - tell the block layer about the device queue depth | |
1013 | * @q: the request queue for the device | |
1014 | * @depth: queue depth | |
1015 | * | |
1016 | */ | |
1017 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) | |
1018 | { | |
1019 | q->queue_depth = depth; | |
9677a3e0 | 1020 | rq_qos_queue_depth_changed(q); |
d278d4a8 JA |
1021 | } |
1022 | EXPORT_SYMBOL(blk_set_queue_depth); | |
1023 | ||
93e9d8e8 JA |
1024 | /** |
1025 | * blk_queue_write_cache - configure queue's write cache | |
1026 | * @q: the request queue for the device | |
1027 | * @wc: write back cache on or off | |
1028 | * @fua: device supports FUA writes, if true | |
1029 | * | |
1030 | * Tell the block layer about the write cache of @q. | |
1031 | */ | |
1032 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) | |
1033 | { | |
43c9835b CH |
1034 | if (wc) { |
1035 | blk_queue_flag_set(QUEUE_FLAG_HW_WC, q); | |
57d74df9 | 1036 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
43c9835b CH |
1037 | } else { |
1038 | blk_queue_flag_clear(QUEUE_FLAG_HW_WC, q); | |
57d74df9 | 1039 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
43c9835b | 1040 | } |
c888a8f9 | 1041 | if (fua) |
57d74df9 | 1042 | blk_queue_flag_set(QUEUE_FLAG_FUA, q); |
c888a8f9 | 1043 | else |
57d74df9 | 1044 | blk_queue_flag_clear(QUEUE_FLAG_FUA, q); |
93e9d8e8 JA |
1045 | } |
1046 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); | |
1047 | ||
68c43f13 DLM |
1048 | /** |
1049 | * blk_queue_required_elevator_features - Set a queue required elevator features | |
1050 | * @q: the request queue for the target device | |
1051 | * @features: Required elevator features OR'ed together | |
1052 | * | |
1053 | * Tell the block layer that for the device controlled through @q, only the | |
1054 | * only elevators that can be used are those that implement at least the set of | |
1055 | * features specified by @features. | |
1056 | */ | |
1057 | void blk_queue_required_elevator_features(struct request_queue *q, | |
1058 | unsigned int features) | |
1059 | { | |
1060 | q->required_elevator_features = features; | |
1061 | } | |
1062 | EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); | |
1063 | ||
45147fb5 YS |
1064 | /** |
1065 | * blk_queue_can_use_dma_map_merging - configure queue for merging segments. | |
1066 | * @q: the request queue for the device | |
1067 | * @dev: the device pointer for dma | |
1068 | * | |
1069 | * Tell the block layer about merging the segments by dma map of @q. | |
1070 | */ | |
1071 | bool blk_queue_can_use_dma_map_merging(struct request_queue *q, | |
1072 | struct device *dev) | |
1073 | { | |
1074 | unsigned long boundary = dma_get_merge_boundary(dev); | |
1075 | ||
1076 | if (!boundary) | |
1077 | return false; | |
1078 | ||
1079 | /* No need to update max_segment_size. see blk_queue_virt_boundary() */ | |
1080 | blk_queue_virt_boundary(q, boundary); | |
1081 | ||
1082 | return true; | |
1083 | } | |
1084 | EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); | |
1085 | ||
27ba3e8f | 1086 | /** |
d73e93b4 CH |
1087 | * disk_set_zoned - inidicate a zoned device |
1088 | * @disk: gendisk to configure | |
27ba3e8f | 1089 | */ |
d73e93b4 | 1090 | void disk_set_zoned(struct gendisk *disk) |
27ba3e8f | 1091 | { |
a805a4fa DLM |
1092 | struct request_queue *q = disk->queue; |
1093 | ||
d73e93b4 CH |
1094 | WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)); |
1095 | ||
1096 | /* | |
1097 | * Set the zone write granularity to the device logical block | |
1098 | * size by default. The driver can change this value if needed. | |
1099 | */ | |
1100 | q->limits.zoned = true; | |
1101 | blk_queue_zone_write_granularity(q, queue_logical_block_size(q)); | |
27ba3e8f | 1102 | } |
6b2bd274 | 1103 | EXPORT_SYMBOL_GPL(disk_set_zoned); |
89098b07 CH |
1104 | |
1105 | int bdev_alignment_offset(struct block_device *bdev) | |
1106 | { | |
1107 | struct request_queue *q = bdev_get_queue(bdev); | |
1108 | ||
1109 | if (q->limits.misaligned) | |
1110 | return -1; | |
1111 | if (bdev_is_partition(bdev)) | |
1112 | return queue_limit_alignment_offset(&q->limits, | |
1113 | bdev->bd_start_sect); | |
1114 | return q->limits.alignment_offset; | |
1115 | } | |
1116 | EXPORT_SYMBOL_GPL(bdev_alignment_offset); | |
5c4b4a5c CH |
1117 | |
1118 | unsigned int bdev_discard_alignment(struct block_device *bdev) | |
1119 | { | |
1120 | struct request_queue *q = bdev_get_queue(bdev); | |
1121 | ||
1122 | if (bdev_is_partition(bdev)) | |
1123 | return queue_limit_discard_alignment(&q->limits, | |
1124 | bdev->bd_start_sect); | |
1125 | return q->limits.discard_alignment; | |
1126 | } | |
1127 | EXPORT_SYMBOL_GPL(bdev_discard_alignment); |