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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) { | |
038105a2 | 149 | if (lim->max_user_sectors < PAGE_SIZE / SECTOR_SIZE) |
d690cb8a CH |
150 | return -EINVAL; |
151 | lim->max_sectors = min(max_hw_sectors, lim->max_user_sectors); | |
152 | } else { | |
153 | lim->max_sectors = min(max_hw_sectors, BLK_DEF_MAX_SECTORS_CAP); | |
154 | } | |
155 | lim->max_sectors = round_down(lim->max_sectors, | |
156 | lim->logical_block_size >> SECTOR_SHIFT); | |
157 | ||
158 | /* | |
159 | * Random default for the maximum number of segments. Driver should not | |
160 | * rely on this and set their own. | |
161 | */ | |
162 | if (!lim->max_segments) | |
163 | lim->max_segments = BLK_MAX_SEGMENTS; | |
164 | ||
4f563a64 CH |
165 | lim->max_discard_sectors = |
166 | min(lim->max_hw_discard_sectors, lim->max_user_discard_sectors); | |
167 | ||
d690cb8a CH |
168 | if (!lim->max_discard_segments) |
169 | lim->max_discard_segments = 1; | |
170 | ||
171 | if (lim->discard_granularity < lim->physical_block_size) | |
172 | lim->discard_granularity = lim->physical_block_size; | |
173 | ||
174 | /* | |
175 | * By default there is no limit on the segment boundary alignment, | |
176 | * but if there is one it can't be smaller than the page size as | |
177 | * that would break all the normal I/O patterns. | |
178 | */ | |
179 | if (!lim->seg_boundary_mask) | |
180 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; | |
181 | if (WARN_ON_ONCE(lim->seg_boundary_mask < PAGE_SIZE - 1)) | |
182 | return -EINVAL; | |
183 | ||
d690cb8a CH |
184 | /* |
185 | * Devices that require a virtual boundary do not support scatter/gather | |
186 | * I/O natively, but instead require a descriptor list entry for each | |
187 | * page (which might not be identical to the Linux PAGE_SIZE). Because | |
188 | * of that they are not limited by our notion of "segment size". | |
189 | */ | |
190 | if (lim->virt_boundary_mask) { | |
191 | if (WARN_ON_ONCE(lim->max_segment_size && | |
192 | lim->max_segment_size != UINT_MAX)) | |
193 | return -EINVAL; | |
194 | lim->max_segment_size = UINT_MAX; | |
a3911966 CH |
195 | } else { |
196 | /* | |
197 | * The maximum segment size has an odd historic 64k default that | |
198 | * drivers probably should override. Just like the I/O size we | |
199 | * require drivers to at least handle a full page per segment. | |
200 | */ | |
201 | if (!lim->max_segment_size) | |
202 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; | |
203 | if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE)) | |
204 | return -EINVAL; | |
d690cb8a CH |
205 | } |
206 | ||
207 | /* | |
208 | * We require drivers to at least do logical block aligned I/O, but | |
209 | * historically could not check for that due to the separate calls | |
210 | * to set the limits. Once the transition is finished the check | |
211 | * below should be narrowed down to check the logical block size. | |
212 | */ | |
213 | if (!lim->dma_alignment) | |
214 | lim->dma_alignment = SECTOR_SIZE - 1; | |
215 | if (WARN_ON_ONCE(lim->dma_alignment > PAGE_SIZE)) | |
216 | return -EINVAL; | |
217 | ||
218 | if (lim->alignment_offset) { | |
219 | lim->alignment_offset &= (lim->physical_block_size - 1); | |
220 | lim->misaligned = 0; | |
221 | } | |
222 | ||
223 | return blk_validate_zoned_limits(lim); | |
224 | } | |
225 | ||
226 | /* | |
227 | * Set the default limits for a newly allocated queue. @lim contains the | |
228 | * initial limits set by the driver, which could be no limit in which case | |
229 | * all fields are cleared to zero. | |
230 | */ | |
231 | int blk_set_default_limits(struct queue_limits *lim) | |
232 | { | |
4f563a64 CH |
233 | /* |
234 | * Most defaults are set by capping the bounds in blk_validate_limits, | |
235 | * but max_user_discard_sectors is special and needs an explicit | |
236 | * initialization to the max value here. | |
237 | */ | |
238 | lim->max_user_discard_sectors = UINT_MAX; | |
d690cb8a CH |
239 | return blk_validate_limits(lim); |
240 | } | |
241 | ||
242 | /** | |
243 | * queue_limits_commit_update - commit an atomic update of queue limits | |
244 | * @q: queue to update | |
245 | * @lim: limits to apply | |
246 | * | |
247 | * Apply the limits in @lim that were obtained from queue_limits_start_update() | |
248 | * and updated by the caller to @q. | |
249 | * | |
250 | * Returns 0 if successful, else a negative error code. | |
251 | */ | |
252 | int queue_limits_commit_update(struct request_queue *q, | |
253 | struct queue_limits *lim) | |
254 | __releases(q->limits_lock) | |
255 | { | |
256 | int error = blk_validate_limits(lim); | |
257 | ||
258 | if (!error) { | |
259 | q->limits = *lim; | |
260 | if (q->disk) | |
261 | blk_apply_bdi_limits(q->disk->bdi, lim); | |
262 | } | |
263 | mutex_unlock(&q->limits_lock); | |
264 | return error; | |
265 | } | |
266 | EXPORT_SYMBOL_GPL(queue_limits_commit_update); | |
267 | ||
631d4efb | 268 | /** |
4c4ab8ae | 269 | * queue_limits_set - apply queue limits to queue |
631d4efb CH |
270 | * @q: queue to update |
271 | * @lim: limits to apply | |
272 | * | |
273 | * Apply the limits in @lim that were freshly initialized to @q. | |
274 | * To update existing limits use queue_limits_start_update() and | |
275 | * queue_limits_commit_update() instead. | |
276 | * | |
277 | * Returns 0 if successful, else a negative error code. | |
278 | */ | |
279 | int queue_limits_set(struct request_queue *q, struct queue_limits *lim) | |
280 | { | |
281 | mutex_lock(&q->limits_lock); | |
282 | return queue_limits_commit_update(q, lim); | |
283 | } | |
284 | EXPORT_SYMBOL_GPL(queue_limits_set); | |
285 | ||
86db1e29 JA |
286 | /** |
287 | * blk_queue_bounce_limit - set bounce buffer limit for queue | |
cd0aca2d | 288 | * @q: the request queue for the device |
9bb33f24 | 289 | * @bounce: bounce limit to enforce |
86db1e29 JA |
290 | * |
291 | * Description: | |
9bb33f24 CH |
292 | * Force bouncing for ISA DMA ranges or highmem. |
293 | * | |
294 | * DEPRECATED, don't use in new code. | |
86db1e29 | 295 | **/ |
9bb33f24 | 296 | void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce bounce) |
86db1e29 | 297 | { |
9bb33f24 | 298 | q->limits.bounce = bounce; |
86db1e29 | 299 | } |
86db1e29 JA |
300 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
301 | ||
302 | /** | |
ca369d51 MP |
303 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
304 | * @q: the request queue for the device | |
2800aac1 | 305 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
86db1e29 JA |
306 | * |
307 | * Description: | |
2800aac1 MP |
308 | * Enables a low level driver to set a hard upper limit, |
309 | * max_hw_sectors, on the size of requests. max_hw_sectors is set by | |
4f258a46 MP |
310 | * the device driver based upon the capabilities of the I/O |
311 | * controller. | |
2800aac1 | 312 | * |
ca369d51 MP |
313 | * max_dev_sectors is a hard limit imposed by the storage device for |
314 | * READ/WRITE requests. It is set by the disk driver. | |
315 | * | |
2800aac1 MP |
316 | * max_sectors is a soft limit imposed by the block layer for |
317 | * filesystem type requests. This value can be overridden on a | |
318 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. | |
319 | * The soft limit can not exceed max_hw_sectors. | |
86db1e29 | 320 | **/ |
ca369d51 | 321 | void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
86db1e29 | 322 | { |
ca369d51 MP |
323 | struct queue_limits *limits = &q->limits; |
324 | unsigned int max_sectors; | |
325 | ||
09cbfeaf KS |
326 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
327 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); | |
f19d1e3b | 328 | pr_info("%s: set to minimum %u\n", __func__, max_hw_sectors); |
86db1e29 JA |
329 | } |
330 | ||
817046ec DLM |
331 | max_hw_sectors = round_down(max_hw_sectors, |
332 | limits->logical_block_size >> SECTOR_SHIFT); | |
30e2bc08 | 333 | limits->max_hw_sectors = max_hw_sectors; |
817046ec | 334 | |
ca369d51 | 335 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
c9c77418 KB |
336 | |
337 | if (limits->max_user_sectors) | |
338 | max_sectors = min(max_sectors, limits->max_user_sectors); | |
339 | else | |
d6b9f4e6 | 340 | max_sectors = min(max_sectors, BLK_DEF_MAX_SECTORS_CAP); |
c9c77418 | 341 | |
817046ec DLM |
342 | max_sectors = round_down(max_sectors, |
343 | limits->logical_block_size >> SECTOR_SHIFT); | |
ca369d51 | 344 | limits->max_sectors = max_sectors; |
817046ec | 345 | |
d152c682 | 346 | if (!q->disk) |
edb0872f | 347 | return; |
d152c682 | 348 | q->disk->bdi->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
86db1e29 | 349 | } |
086fa5ff | 350 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
86db1e29 | 351 | |
762380ad JA |
352 | /** |
353 | * blk_queue_chunk_sectors - set size of the chunk for this queue | |
354 | * @q: the request queue for the device | |
355 | * @chunk_sectors: chunk sectors in the usual 512b unit | |
356 | * | |
357 | * Description: | |
358 | * If a driver doesn't want IOs to cross a given chunk size, it can set | |
07d098e6 MS |
359 | * this limit and prevent merging across chunks. Note that the block layer |
360 | * must accept a page worth of data at any offset. So if the crossing of | |
361 | * chunks is a hard limitation in the driver, it must still be prepared | |
362 | * to split single page bios. | |
762380ad JA |
363 | **/ |
364 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) | |
365 | { | |
762380ad JA |
366 | q->limits.chunk_sectors = chunk_sectors; |
367 | } | |
368 | EXPORT_SYMBOL(blk_queue_chunk_sectors); | |
369 | ||
67efc925 CH |
370 | /** |
371 | * blk_queue_max_discard_sectors - set max sectors for a single discard | |
372 | * @q: the request queue for the device | |
c7ebf065 | 373 | * @max_discard_sectors: maximum number of sectors to discard |
67efc925 CH |
374 | **/ |
375 | void blk_queue_max_discard_sectors(struct request_queue *q, | |
376 | unsigned int max_discard_sectors) | |
377 | { | |
4f563a64 CH |
378 | struct queue_limits *lim = &q->limits; |
379 | ||
380 | lim->max_hw_discard_sectors = max_discard_sectors; | |
381 | lim->max_discard_sectors = | |
382 | min(max_discard_sectors, lim->max_user_discard_sectors); | |
67efc925 CH |
383 | } |
384 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); | |
385 | ||
44abff2c CH |
386 | /** |
387 | * blk_queue_max_secure_erase_sectors - set max sectors for a secure erase | |
388 | * @q: the request queue for the device | |
389 | * @max_sectors: maximum number of sectors to secure_erase | |
390 | **/ | |
391 | void blk_queue_max_secure_erase_sectors(struct request_queue *q, | |
392 | unsigned int max_sectors) | |
393 | { | |
394 | q->limits.max_secure_erase_sectors = max_sectors; | |
395 | } | |
396 | EXPORT_SYMBOL(blk_queue_max_secure_erase_sectors); | |
397 | ||
a6f0788e CK |
398 | /** |
399 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single | |
400 | * write zeroes | |
401 | * @q: the request queue for the device | |
402 | * @max_write_zeroes_sectors: maximum number of sectors to write per command | |
403 | **/ | |
404 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, | |
405 | unsigned int max_write_zeroes_sectors) | |
406 | { | |
407 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; | |
408 | } | |
409 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); | |
410 | ||
0512a75b KB |
411 | /** |
412 | * blk_queue_max_zone_append_sectors - set max sectors for a single zone append | |
413 | * @q: the request queue for the device | |
414 | * @max_zone_append_sectors: maximum number of sectors to write per command | |
415 | **/ | |
416 | void blk_queue_max_zone_append_sectors(struct request_queue *q, | |
417 | unsigned int max_zone_append_sectors) | |
418 | { | |
419 | unsigned int max_sectors; | |
420 | ||
421 | if (WARN_ON(!blk_queue_is_zoned(q))) | |
422 | return; | |
423 | ||
424 | max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors); | |
425 | max_sectors = min(q->limits.chunk_sectors, max_sectors); | |
426 | ||
427 | /* | |
428 | * Signal eventual driver bugs resulting in the max_zone_append sectors limit | |
429 | * being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set, | |
430 | * or the max_hw_sectors limit not set. | |
431 | */ | |
432 | WARN_ON(!max_sectors); | |
433 | ||
434 | q->limits.max_zone_append_sectors = max_sectors; | |
435 | } | |
436 | EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors); | |
437 | ||
86db1e29 | 438 | /** |
8a78362c | 439 | * blk_queue_max_segments - set max hw segments for a request for this queue |
86db1e29 JA |
440 | * @q: the request queue for the device |
441 | * @max_segments: max number of segments | |
442 | * | |
443 | * Description: | |
444 | * Enables a low level driver to set an upper limit on the number of | |
8a78362c | 445 | * hw data segments in a request. |
86db1e29 | 446 | **/ |
8a78362c | 447 | void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
86db1e29 JA |
448 | { |
449 | if (!max_segments) { | |
450 | max_segments = 1; | |
f19d1e3b | 451 | pr_info("%s: set to minimum %u\n", __func__, max_segments); |
86db1e29 JA |
452 | } |
453 | ||
8a78362c | 454 | q->limits.max_segments = max_segments; |
86db1e29 | 455 | } |
8a78362c | 456 | EXPORT_SYMBOL(blk_queue_max_segments); |
86db1e29 | 457 | |
1e739730 CH |
458 | /** |
459 | * blk_queue_max_discard_segments - set max segments for discard requests | |
460 | * @q: the request queue for the device | |
461 | * @max_segments: max number of segments | |
462 | * | |
463 | * Description: | |
464 | * Enables a low level driver to set an upper limit on the number of | |
465 | * segments in a discard request. | |
466 | **/ | |
467 | void blk_queue_max_discard_segments(struct request_queue *q, | |
468 | unsigned short max_segments) | |
469 | { | |
470 | q->limits.max_discard_segments = max_segments; | |
471 | } | |
472 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); | |
473 | ||
86db1e29 JA |
474 | /** |
475 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg | |
476 | * @q: the request queue for the device | |
477 | * @max_size: max size of segment in bytes | |
478 | * | |
479 | * Description: | |
480 | * Enables a low level driver to set an upper limit on the size of a | |
481 | * coalesced segment | |
482 | **/ | |
483 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) | |
484 | { | |
09cbfeaf KS |
485 | if (max_size < PAGE_SIZE) { |
486 | max_size = PAGE_SIZE; | |
f19d1e3b | 487 | pr_info("%s: set to minimum %u\n", __func__, max_size); |
86db1e29 JA |
488 | } |
489 | ||
09324d32 CH |
490 | /* see blk_queue_virt_boundary() for the explanation */ |
491 | WARN_ON_ONCE(q->limits.virt_boundary_mask); | |
492 | ||
025146e1 | 493 | q->limits.max_segment_size = max_size; |
86db1e29 | 494 | } |
86db1e29 JA |
495 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
496 | ||
497 | /** | |
e1defc4f | 498 | * blk_queue_logical_block_size - set logical block size for the queue |
86db1e29 | 499 | * @q: the request queue for the device |
e1defc4f | 500 | * @size: the logical block size, in bytes |
86db1e29 JA |
501 | * |
502 | * Description: | |
e1defc4f MP |
503 | * This should be set to the lowest possible block size that the |
504 | * storage device can address. The default of 512 covers most | |
505 | * hardware. | |
86db1e29 | 506 | **/ |
ad6bf88a | 507 | void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) |
86db1e29 | 508 | { |
817046ec DLM |
509 | struct queue_limits *limits = &q->limits; |
510 | ||
511 | limits->logical_block_size = size; | |
512 | ||
3c407dc7 CH |
513 | if (limits->discard_granularity < limits->logical_block_size) |
514 | limits->discard_granularity = limits->logical_block_size; | |
515 | ||
817046ec DLM |
516 | if (limits->physical_block_size < size) |
517 | limits->physical_block_size = size; | |
c72758f3 | 518 | |
817046ec DLM |
519 | if (limits->io_min < limits->physical_block_size) |
520 | limits->io_min = limits->physical_block_size; | |
c72758f3 | 521 | |
817046ec DLM |
522 | limits->max_hw_sectors = |
523 | round_down(limits->max_hw_sectors, size >> SECTOR_SHIFT); | |
524 | limits->max_sectors = | |
525 | round_down(limits->max_sectors, size >> SECTOR_SHIFT); | |
86db1e29 | 526 | } |
e1defc4f | 527 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
86db1e29 | 528 | |
c72758f3 MP |
529 | /** |
530 | * blk_queue_physical_block_size - set physical block size for the queue | |
531 | * @q: the request queue for the device | |
532 | * @size: the physical block size, in bytes | |
533 | * | |
534 | * Description: | |
535 | * This should be set to the lowest possible sector size that the | |
536 | * hardware can operate on without reverting to read-modify-write | |
537 | * operations. | |
538 | */ | |
892b6f90 | 539 | void blk_queue_physical_block_size(struct request_queue *q, unsigned int size) |
c72758f3 MP |
540 | { |
541 | q->limits.physical_block_size = size; | |
542 | ||
543 | if (q->limits.physical_block_size < q->limits.logical_block_size) | |
544 | q->limits.physical_block_size = q->limits.logical_block_size; | |
545 | ||
458aa1a0 CH |
546 | if (q->limits.discard_granularity < q->limits.physical_block_size) |
547 | q->limits.discard_granularity = q->limits.physical_block_size; | |
548 | ||
c72758f3 MP |
549 | if (q->limits.io_min < q->limits.physical_block_size) |
550 | q->limits.io_min = q->limits.physical_block_size; | |
551 | } | |
552 | EXPORT_SYMBOL(blk_queue_physical_block_size); | |
553 | ||
a805a4fa DLM |
554 | /** |
555 | * blk_queue_zone_write_granularity - set zone write granularity for the queue | |
556 | * @q: the request queue for the zoned device | |
557 | * @size: the zone write granularity size, in bytes | |
558 | * | |
559 | * Description: | |
560 | * This should be set to the lowest possible size allowing to write in | |
561 | * sequential zones of a zoned block device. | |
562 | */ | |
563 | void blk_queue_zone_write_granularity(struct request_queue *q, | |
564 | unsigned int size) | |
565 | { | |
566 | if (WARN_ON_ONCE(!blk_queue_is_zoned(q))) | |
567 | return; | |
568 | ||
569 | q->limits.zone_write_granularity = size; | |
570 | ||
571 | if (q->limits.zone_write_granularity < q->limits.logical_block_size) | |
572 | q->limits.zone_write_granularity = q->limits.logical_block_size; | |
573 | } | |
574 | EXPORT_SYMBOL_GPL(blk_queue_zone_write_granularity); | |
575 | ||
c72758f3 MP |
576 | /** |
577 | * blk_queue_alignment_offset - set physical block alignment offset | |
578 | * @q: the request queue for the device | |
8ebf9756 | 579 | * @offset: alignment offset in bytes |
c72758f3 MP |
580 | * |
581 | * Description: | |
582 | * Some devices are naturally misaligned to compensate for things like | |
583 | * the legacy DOS partition table 63-sector offset. Low-level drivers | |
584 | * should call this function for devices whose first sector is not | |
585 | * naturally aligned. | |
586 | */ | |
587 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) | |
588 | { | |
589 | q->limits.alignment_offset = | |
590 | offset & (q->limits.physical_block_size - 1); | |
591 | q->limits.misaligned = 0; | |
592 | } | |
593 | EXPORT_SYMBOL(blk_queue_alignment_offset); | |
594 | ||
471aa704 | 595 | void disk_update_readahead(struct gendisk *disk) |
c2e4cd57 | 596 | { |
b9947297 | 597 | blk_apply_bdi_limits(disk->bdi, &disk->queue->limits); |
c2e4cd57 | 598 | } |
471aa704 | 599 | EXPORT_SYMBOL_GPL(disk_update_readahead); |
c2e4cd57 | 600 | |
7c958e32 MP |
601 | /** |
602 | * blk_limits_io_min - set minimum request size for a device | |
603 | * @limits: the queue limits | |
604 | * @min: smallest I/O size in bytes | |
605 | * | |
606 | * Description: | |
607 | * Some devices have an internal block size bigger than the reported | |
608 | * hardware sector size. This function can be used to signal the | |
609 | * smallest I/O the device can perform without incurring a performance | |
610 | * penalty. | |
611 | */ | |
612 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) | |
613 | { | |
614 | limits->io_min = min; | |
615 | ||
616 | if (limits->io_min < limits->logical_block_size) | |
617 | limits->io_min = limits->logical_block_size; | |
618 | ||
619 | if (limits->io_min < limits->physical_block_size) | |
620 | limits->io_min = limits->physical_block_size; | |
621 | } | |
622 | EXPORT_SYMBOL(blk_limits_io_min); | |
623 | ||
c72758f3 MP |
624 | /** |
625 | * blk_queue_io_min - set minimum request size for the queue | |
626 | * @q: the request queue for the device | |
8ebf9756 | 627 | * @min: smallest I/O size in bytes |
c72758f3 MP |
628 | * |
629 | * Description: | |
7e5f5fb0 MP |
630 | * Storage devices may report a granularity or preferred minimum I/O |
631 | * size which is the smallest request the device can perform without | |
632 | * incurring a performance penalty. For disk drives this is often the | |
633 | * physical block size. For RAID arrays it is often the stripe chunk | |
634 | * size. A properly aligned multiple of minimum_io_size is the | |
635 | * preferred request size for workloads where a high number of I/O | |
636 | * operations is desired. | |
c72758f3 MP |
637 | */ |
638 | void blk_queue_io_min(struct request_queue *q, unsigned int min) | |
639 | { | |
7c958e32 | 640 | blk_limits_io_min(&q->limits, min); |
c72758f3 MP |
641 | } |
642 | EXPORT_SYMBOL(blk_queue_io_min); | |
643 | ||
3c5820c7 MP |
644 | /** |
645 | * blk_limits_io_opt - set optimal request size for a device | |
646 | * @limits: the queue limits | |
647 | * @opt: smallest I/O size in bytes | |
648 | * | |
649 | * Description: | |
650 | * Storage devices may report an optimal I/O size, which is the | |
651 | * device's preferred unit for sustained I/O. This is rarely reported | |
652 | * for disk drives. For RAID arrays it is usually the stripe width or | |
653 | * the internal track size. A properly aligned multiple of | |
654 | * optimal_io_size is the preferred request size for workloads where | |
655 | * sustained throughput is desired. | |
656 | */ | |
657 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) | |
658 | { | |
659 | limits->io_opt = opt; | |
660 | } | |
661 | EXPORT_SYMBOL(blk_limits_io_opt); | |
662 | ||
c72758f3 MP |
663 | /** |
664 | * blk_queue_io_opt - set optimal request size for the queue | |
665 | * @q: the request queue for the device | |
8ebf9756 | 666 | * @opt: optimal request size in bytes |
c72758f3 MP |
667 | * |
668 | * Description: | |
7e5f5fb0 MP |
669 | * Storage devices may report an optimal I/O size, which is the |
670 | * device's preferred unit for sustained I/O. This is rarely reported | |
671 | * for disk drives. For RAID arrays it is usually the stripe width or | |
672 | * the internal track size. A properly aligned multiple of | |
673 | * optimal_io_size is the preferred request size for workloads where | |
674 | * sustained throughput is desired. | |
c72758f3 MP |
675 | */ |
676 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) | |
677 | { | |
3c5820c7 | 678 | blk_limits_io_opt(&q->limits, opt); |
d152c682 | 679 | if (!q->disk) |
edb0872f | 680 | return; |
d152c682 | 681 | q->disk->bdi->ra_pages = |
c2e4cd57 | 682 | max(queue_io_opt(q) * 2 / PAGE_SIZE, VM_READAHEAD_PAGES); |
c72758f3 MP |
683 | } |
684 | EXPORT_SYMBOL(blk_queue_io_opt); | |
685 | ||
aa261f20 | 686 | static int queue_limit_alignment_offset(const struct queue_limits *lim, |
89098b07 CH |
687 | sector_t sector) |
688 | { | |
689 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
690 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) | |
691 | << SECTOR_SHIFT; | |
692 | ||
693 | return (granularity + lim->alignment_offset - alignment) % granularity; | |
694 | } | |
695 | ||
aa261f20 BVA |
696 | static unsigned int queue_limit_discard_alignment( |
697 | const struct queue_limits *lim, sector_t sector) | |
5c4b4a5c CH |
698 | { |
699 | unsigned int alignment, granularity, offset; | |
700 | ||
701 | if (!lim->max_discard_sectors) | |
702 | return 0; | |
703 | ||
704 | /* Why are these in bytes, not sectors? */ | |
705 | alignment = lim->discard_alignment >> SECTOR_SHIFT; | |
706 | granularity = lim->discard_granularity >> SECTOR_SHIFT; | |
707 | if (!granularity) | |
708 | return 0; | |
709 | ||
710 | /* Offset of the partition start in 'granularity' sectors */ | |
711 | offset = sector_div(sector, granularity); | |
712 | ||
713 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
714 | offset = (granularity + alignment - offset) % granularity; | |
715 | ||
716 | /* Turn it back into bytes, gaah */ | |
717 | return offset << SECTOR_SHIFT; | |
718 | } | |
719 | ||
97f433c3 MP |
720 | static unsigned int blk_round_down_sectors(unsigned int sectors, unsigned int lbs) |
721 | { | |
722 | sectors = round_down(sectors, lbs >> SECTOR_SHIFT); | |
723 | if (sectors < PAGE_SIZE >> SECTOR_SHIFT) | |
724 | sectors = PAGE_SIZE >> SECTOR_SHIFT; | |
725 | return sectors; | |
726 | } | |
727 | ||
c72758f3 MP |
728 | /** |
729 | * blk_stack_limits - adjust queue_limits for stacked devices | |
81744ee4 MP |
730 | * @t: the stacking driver limits (top device) |
731 | * @b: the underlying queue limits (bottom, component device) | |
e03a72e1 | 732 | * @start: first data sector within component device |
c72758f3 MP |
733 | * |
734 | * Description: | |
81744ee4 MP |
735 | * This function is used by stacking drivers like MD and DM to ensure |
736 | * that all component devices have compatible block sizes and | |
737 | * alignments. The stacking driver must provide a queue_limits | |
738 | * struct (top) and then iteratively call the stacking function for | |
739 | * all component (bottom) devices. The stacking function will | |
740 | * attempt to combine the values and ensure proper alignment. | |
741 | * | |
742 | * Returns 0 if the top and bottom queue_limits are compatible. The | |
743 | * top device's block sizes and alignment offsets may be adjusted to | |
744 | * ensure alignment with the bottom device. If no compatible sizes | |
745 | * and alignments exist, -1 is returned and the resulting top | |
746 | * queue_limits will have the misaligned flag set to indicate that | |
747 | * the alignment_offset is undefined. | |
c72758f3 MP |
748 | */ |
749 | int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, | |
e03a72e1 | 750 | sector_t start) |
c72758f3 | 751 | { |
e03a72e1 | 752 | unsigned int top, bottom, alignment, ret = 0; |
86b37281 | 753 | |
c72758f3 MP |
754 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
755 | t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); | |
ca369d51 | 756 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
a6f0788e CK |
757 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
758 | b->max_write_zeroes_sectors); | |
0512a75b KB |
759 | t->max_zone_append_sectors = min(t->max_zone_append_sectors, |
760 | b->max_zone_append_sectors); | |
9bb33f24 | 761 | t->bounce = max(t->bounce, b->bounce); |
c72758f3 MP |
762 | |
763 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, | |
764 | b->seg_boundary_mask); | |
03100aad KB |
765 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
766 | b->virt_boundary_mask); | |
c72758f3 | 767 | |
8a78362c | 768 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
1e739730 CH |
769 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
770 | b->max_discard_segments); | |
13f05c8d MP |
771 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
772 | b->max_integrity_segments); | |
c72758f3 MP |
773 | |
774 | t->max_segment_size = min_not_zero(t->max_segment_size, | |
775 | b->max_segment_size); | |
776 | ||
fe0b393f MP |
777 | t->misaligned |= b->misaligned; |
778 | ||
e03a72e1 | 779 | alignment = queue_limit_alignment_offset(b, start); |
9504e086 | 780 | |
81744ee4 MP |
781 | /* Bottom device has different alignment. Check that it is |
782 | * compatible with the current top alignment. | |
783 | */ | |
9504e086 MP |
784 | if (t->alignment_offset != alignment) { |
785 | ||
786 | top = max(t->physical_block_size, t->io_min) | |
787 | + t->alignment_offset; | |
81744ee4 | 788 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
9504e086 | 789 | |
81744ee4 | 790 | /* Verify that top and bottom intervals line up */ |
b8839b8c | 791 | if (max(top, bottom) % min(top, bottom)) { |
9504e086 | 792 | t->misaligned = 1; |
fe0b393f MP |
793 | ret = -1; |
794 | } | |
9504e086 MP |
795 | } |
796 | ||
c72758f3 MP |
797 | t->logical_block_size = max(t->logical_block_size, |
798 | b->logical_block_size); | |
799 | ||
800 | t->physical_block_size = max(t->physical_block_size, | |
801 | b->physical_block_size); | |
802 | ||
803 | t->io_min = max(t->io_min, b->io_min); | |
e9637415 | 804 | t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); |
c964d62f | 805 | t->dma_alignment = max(t->dma_alignment, b->dma_alignment); |
7e7986f9 MS |
806 | |
807 | /* Set non-power-of-2 compatible chunk_sectors boundary */ | |
808 | if (b->chunk_sectors) | |
809 | t->chunk_sectors = gcd(t->chunk_sectors, b->chunk_sectors); | |
9504e086 | 810 | |
81744ee4 | 811 | /* Physical block size a multiple of the logical block size? */ |
9504e086 MP |
812 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
813 | t->physical_block_size = t->logical_block_size; | |
c72758f3 | 814 | t->misaligned = 1; |
fe0b393f | 815 | ret = -1; |
86b37281 MP |
816 | } |
817 | ||
81744ee4 | 818 | /* Minimum I/O a multiple of the physical block size? */ |
9504e086 MP |
819 | if (t->io_min & (t->physical_block_size - 1)) { |
820 | t->io_min = t->physical_block_size; | |
821 | t->misaligned = 1; | |
fe0b393f | 822 | ret = -1; |
c72758f3 MP |
823 | } |
824 | ||
81744ee4 | 825 | /* Optimal I/O a multiple of the physical block size? */ |
9504e086 MP |
826 | if (t->io_opt & (t->physical_block_size - 1)) { |
827 | t->io_opt = 0; | |
828 | t->misaligned = 1; | |
fe0b393f | 829 | ret = -1; |
9504e086 | 830 | } |
c72758f3 | 831 | |
22ada802 MS |
832 | /* chunk_sectors a multiple of the physical block size? */ |
833 | if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) { | |
834 | t->chunk_sectors = 0; | |
835 | t->misaligned = 1; | |
836 | ret = -1; | |
837 | } | |
838 | ||
c78afc62 KO |
839 | t->raid_partial_stripes_expensive = |
840 | max(t->raid_partial_stripes_expensive, | |
841 | b->raid_partial_stripes_expensive); | |
842 | ||
81744ee4 | 843 | /* Find lowest common alignment_offset */ |
e9637415 | 844 | t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) |
b8839b8c | 845 | % max(t->physical_block_size, t->io_min); |
86b37281 | 846 | |
81744ee4 | 847 | /* Verify that new alignment_offset is on a logical block boundary */ |
fe0b393f | 848 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
c72758f3 | 849 | t->misaligned = 1; |
fe0b393f MP |
850 | ret = -1; |
851 | } | |
c72758f3 | 852 | |
97f433c3 MP |
853 | t->max_sectors = blk_round_down_sectors(t->max_sectors, t->logical_block_size); |
854 | t->max_hw_sectors = blk_round_down_sectors(t->max_hw_sectors, t->logical_block_size); | |
855 | t->max_dev_sectors = blk_round_down_sectors(t->max_dev_sectors, t->logical_block_size); | |
856 | ||
9504e086 MP |
857 | /* Discard alignment and granularity */ |
858 | if (b->discard_granularity) { | |
e03a72e1 | 859 | alignment = queue_limit_discard_alignment(b, start); |
9504e086 MP |
860 | |
861 | if (t->discard_granularity != 0 && | |
862 | t->discard_alignment != alignment) { | |
863 | top = t->discard_granularity + t->discard_alignment; | |
864 | bottom = b->discard_granularity + alignment; | |
70dd5bf3 | 865 | |
9504e086 | 866 | /* Verify that top and bottom intervals line up */ |
8dd2cb7e | 867 | if ((max(top, bottom) % min(top, bottom)) != 0) |
9504e086 MP |
868 | t->discard_misaligned = 1; |
869 | } | |
870 | ||
81744ee4 MP |
871 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
872 | b->max_discard_sectors); | |
0034af03 JA |
873 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
874 | b->max_hw_discard_sectors); | |
9504e086 MP |
875 | t->discard_granularity = max(t->discard_granularity, |
876 | b->discard_granularity); | |
e9637415 | 877 | t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % |
8dd2cb7e | 878 | t->discard_granularity; |
9504e086 | 879 | } |
44abff2c CH |
880 | t->max_secure_erase_sectors = min_not_zero(t->max_secure_erase_sectors, |
881 | b->max_secure_erase_sectors); | |
a805a4fa DLM |
882 | t->zone_write_granularity = max(t->zone_write_granularity, |
883 | b->zone_write_granularity); | |
3093a479 | 884 | t->zoned = max(t->zoned, b->zoned); |
c8f6f88d DLM |
885 | if (!t->zoned) { |
886 | t->zone_write_granularity = 0; | |
887 | t->max_zone_append_sectors = 0; | |
888 | } | |
fe0b393f | 889 | return ret; |
c72758f3 | 890 | } |
5d85d324 | 891 | EXPORT_SYMBOL(blk_stack_limits); |
c72758f3 | 892 | |
c1373f1c CH |
893 | /** |
894 | * queue_limits_stack_bdev - adjust queue_limits for stacked devices | |
895 | * @t: the stacking driver limits (top device) | |
896 | * @bdev: the underlying block device (bottom) | |
897 | * @offset: offset to beginning of data within component device | |
898 | * @pfx: prefix to use for warnings logged | |
899 | * | |
900 | * Description: | |
901 | * This function is used by stacking drivers like MD and DM to ensure | |
902 | * that all component devices have compatible block sizes and | |
903 | * alignments. The stacking driver must provide a queue_limits | |
904 | * struct (top) and then iteratively call the stacking function for | |
905 | * all component (bottom) devices. The stacking function will | |
906 | * attempt to combine the values and ensure proper alignment. | |
907 | */ | |
908 | void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, | |
909 | sector_t offset, const char *pfx) | |
910 | { | |
911 | if (blk_stack_limits(t, &bdev_get_queue(bdev)->limits, | |
912 | get_start_sect(bdev) + offset)) | |
913 | pr_notice("%s: Warning: Device %pg is misaligned\n", | |
914 | pfx, bdev); | |
915 | } | |
916 | EXPORT_SYMBOL_GPL(queue_limits_stack_bdev); | |
917 | ||
27f8221a FT |
918 | /** |
919 | * blk_queue_update_dma_pad - update pad mask | |
920 | * @q: the request queue for the device | |
921 | * @mask: pad mask | |
922 | * | |
923 | * Update dma pad mask. | |
924 | * | |
925 | * Appending pad buffer to a request modifies the last entry of a | |
926 | * scatter list such that it includes the pad buffer. | |
927 | **/ | |
928 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) | |
929 | { | |
930 | if (mask > q->dma_pad_mask) | |
931 | q->dma_pad_mask = mask; | |
932 | } | |
933 | EXPORT_SYMBOL(blk_queue_update_dma_pad); | |
934 | ||
86db1e29 JA |
935 | /** |
936 | * blk_queue_segment_boundary - set boundary rules for segment merging | |
937 | * @q: the request queue for the device | |
938 | * @mask: the memory boundary mask | |
939 | **/ | |
940 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) | |
941 | { | |
09cbfeaf KS |
942 | if (mask < PAGE_SIZE - 1) { |
943 | mask = PAGE_SIZE - 1; | |
f19d1e3b | 944 | pr_info("%s: set to minimum %lx\n", __func__, mask); |
86db1e29 JA |
945 | } |
946 | ||
025146e1 | 947 | q->limits.seg_boundary_mask = mask; |
86db1e29 | 948 | } |
86db1e29 JA |
949 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
950 | ||
03100aad KB |
951 | /** |
952 | * blk_queue_virt_boundary - set boundary rules for bio merging | |
953 | * @q: the request queue for the device | |
954 | * @mask: the memory boundary mask | |
955 | **/ | |
956 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) | |
957 | { | |
958 | q->limits.virt_boundary_mask = mask; | |
09324d32 CH |
959 | |
960 | /* | |
961 | * Devices that require a virtual boundary do not support scatter/gather | |
962 | * I/O natively, but instead require a descriptor list entry for each | |
963 | * page (which might not be idential to the Linux PAGE_SIZE). Because | |
964 | * of that they are not limited by our notion of "segment size". | |
965 | */ | |
c6c84f78 CH |
966 | if (mask) |
967 | q->limits.max_segment_size = UINT_MAX; | |
03100aad KB |
968 | } |
969 | EXPORT_SYMBOL(blk_queue_virt_boundary); | |
970 | ||
86db1e29 JA |
971 | /** |
972 | * blk_queue_dma_alignment - set dma length and memory alignment | |
973 | * @q: the request queue for the device | |
974 | * @mask: alignment mask | |
975 | * | |
976 | * description: | |
710027a4 | 977 | * set required memory and length alignment for direct dma transactions. |
8feb4d20 | 978 | * this is used when building direct io requests for the queue. |
86db1e29 JA |
979 | * |
980 | **/ | |
981 | void blk_queue_dma_alignment(struct request_queue *q, int mask) | |
982 | { | |
c964d62f | 983 | q->limits.dma_alignment = mask; |
86db1e29 | 984 | } |
86db1e29 JA |
985 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
986 | ||
987 | /** | |
988 | * blk_queue_update_dma_alignment - update dma length and memory alignment | |
989 | * @q: the request queue for the device | |
990 | * @mask: alignment mask | |
991 | * | |
992 | * description: | |
710027a4 | 993 | * update required memory and length alignment for direct dma transactions. |
86db1e29 JA |
994 | * If the requested alignment is larger than the current alignment, then |
995 | * the current queue alignment is updated to the new value, otherwise it | |
996 | * is left alone. The design of this is to allow multiple objects | |
997 | * (driver, device, transport etc) to set their respective | |
998 | * alignments without having them interfere. | |
999 | * | |
1000 | **/ | |
1001 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) | |
1002 | { | |
1003 | BUG_ON(mask > PAGE_SIZE); | |
1004 | ||
c964d62f KB |
1005 | if (mask > q->limits.dma_alignment) |
1006 | q->limits.dma_alignment = mask; | |
86db1e29 | 1007 | } |
86db1e29 JA |
1008 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
1009 | ||
d278d4a8 JA |
1010 | /** |
1011 | * blk_set_queue_depth - tell the block layer about the device queue depth | |
1012 | * @q: the request queue for the device | |
1013 | * @depth: queue depth | |
1014 | * | |
1015 | */ | |
1016 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) | |
1017 | { | |
1018 | q->queue_depth = depth; | |
9677a3e0 | 1019 | rq_qos_queue_depth_changed(q); |
d278d4a8 JA |
1020 | } |
1021 | EXPORT_SYMBOL(blk_set_queue_depth); | |
1022 | ||
93e9d8e8 JA |
1023 | /** |
1024 | * blk_queue_write_cache - configure queue's write cache | |
1025 | * @q: the request queue for the device | |
1026 | * @wc: write back cache on or off | |
1027 | * @fua: device supports FUA writes, if true | |
1028 | * | |
1029 | * Tell the block layer about the write cache of @q. | |
1030 | */ | |
1031 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) | |
1032 | { | |
43c9835b CH |
1033 | if (wc) { |
1034 | blk_queue_flag_set(QUEUE_FLAG_HW_WC, q); | |
57d74df9 | 1035 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
43c9835b CH |
1036 | } else { |
1037 | blk_queue_flag_clear(QUEUE_FLAG_HW_WC, q); | |
57d74df9 | 1038 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
43c9835b | 1039 | } |
c888a8f9 | 1040 | if (fua) |
57d74df9 | 1041 | blk_queue_flag_set(QUEUE_FLAG_FUA, q); |
c888a8f9 | 1042 | else |
57d74df9 | 1043 | blk_queue_flag_clear(QUEUE_FLAG_FUA, q); |
93e9d8e8 JA |
1044 | } |
1045 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); | |
1046 | ||
68c43f13 DLM |
1047 | /** |
1048 | * blk_queue_required_elevator_features - Set a queue required elevator features | |
1049 | * @q: the request queue for the target device | |
1050 | * @features: Required elevator features OR'ed together | |
1051 | * | |
1052 | * Tell the block layer that for the device controlled through @q, only the | |
1053 | * only elevators that can be used are those that implement at least the set of | |
1054 | * features specified by @features. | |
1055 | */ | |
1056 | void blk_queue_required_elevator_features(struct request_queue *q, | |
1057 | unsigned int features) | |
1058 | { | |
1059 | q->required_elevator_features = features; | |
1060 | } | |
1061 | EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); | |
1062 | ||
45147fb5 YS |
1063 | /** |
1064 | * blk_queue_can_use_dma_map_merging - configure queue for merging segments. | |
1065 | * @q: the request queue for the device | |
1066 | * @dev: the device pointer for dma | |
1067 | * | |
1068 | * Tell the block layer about merging the segments by dma map of @q. | |
1069 | */ | |
1070 | bool blk_queue_can_use_dma_map_merging(struct request_queue *q, | |
1071 | struct device *dev) | |
1072 | { | |
1073 | unsigned long boundary = dma_get_merge_boundary(dev); | |
1074 | ||
1075 | if (!boundary) | |
1076 | return false; | |
1077 | ||
1078 | /* No need to update max_segment_size. see blk_queue_virt_boundary() */ | |
1079 | blk_queue_virt_boundary(q, boundary); | |
1080 | ||
1081 | return true; | |
1082 | } | |
1083 | EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); | |
1084 | ||
27ba3e8f | 1085 | /** |
d73e93b4 CH |
1086 | * disk_set_zoned - inidicate a zoned device |
1087 | * @disk: gendisk to configure | |
27ba3e8f | 1088 | */ |
d73e93b4 | 1089 | void disk_set_zoned(struct gendisk *disk) |
27ba3e8f | 1090 | { |
a805a4fa DLM |
1091 | struct request_queue *q = disk->queue; |
1092 | ||
d73e93b4 CH |
1093 | WARN_ON_ONCE(!IS_ENABLED(CONFIG_BLK_DEV_ZONED)); |
1094 | ||
1095 | /* | |
1096 | * Set the zone write granularity to the device logical block | |
1097 | * size by default. The driver can change this value if needed. | |
1098 | */ | |
1099 | q->limits.zoned = true; | |
1100 | blk_queue_zone_write_granularity(q, queue_logical_block_size(q)); | |
27ba3e8f | 1101 | } |
6b2bd274 | 1102 | EXPORT_SYMBOL_GPL(disk_set_zoned); |
89098b07 CH |
1103 | |
1104 | int bdev_alignment_offset(struct block_device *bdev) | |
1105 | { | |
1106 | struct request_queue *q = bdev_get_queue(bdev); | |
1107 | ||
1108 | if (q->limits.misaligned) | |
1109 | return -1; | |
1110 | if (bdev_is_partition(bdev)) | |
1111 | return queue_limit_alignment_offset(&q->limits, | |
1112 | bdev->bd_start_sect); | |
1113 | return q->limits.alignment_offset; | |
1114 | } | |
1115 | EXPORT_SYMBOL_GPL(bdev_alignment_offset); | |
5c4b4a5c CH |
1116 | |
1117 | unsigned int bdev_discard_alignment(struct block_device *bdev) | |
1118 | { | |
1119 | struct request_queue *q = bdev_get_queue(bdev); | |
1120 | ||
1121 | if (bdev_is_partition(bdev)) | |
1122 | return queue_limit_discard_alignment(&q->limits, | |
1123 | bdev->bd_start_sect); | |
1124 | return q->limits.discard_alignment; | |
1125 | } | |
1126 | EXPORT_SYMBOL_GPL(bdev_discard_alignment); |