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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> | |
57c8a661 | 10 | #include <linux/memblock.h> /* for max_pfn/max_low_pfn */ |
70dd5bf3 | 11 | #include <linux/gcd.h> |
2cda2728 | 12 | #include <linux/lcm.h> |
ad5ebd2f | 13 | #include <linux/jiffies.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
45147fb5 | 15 | #include <linux/dma-mapping.h> |
86db1e29 JA |
16 | |
17 | #include "blk.h" | |
87760e5e | 18 | #include "blk-wbt.h" |
86db1e29 | 19 | |
6728cb0e | 20 | unsigned long blk_max_low_pfn; |
86db1e29 | 21 | EXPORT_SYMBOL(blk_max_low_pfn); |
6728cb0e JA |
22 | |
23 | unsigned long blk_max_pfn; | |
86db1e29 | 24 | |
242f9dcb JA |
25 | void blk_queue_rq_timeout(struct request_queue *q, unsigned int timeout) |
26 | { | |
27 | q->rq_timeout = timeout; | |
28 | } | |
29 | EXPORT_SYMBOL_GPL(blk_queue_rq_timeout); | |
30 | ||
e475bba2 MP |
31 | /** |
32 | * blk_set_default_limits - reset limits to default values | |
f740f5ca | 33 | * @lim: the queue_limits structure to reset |
e475bba2 MP |
34 | * |
35 | * Description: | |
b1bd055d | 36 | * Returns a queue_limit struct to its default state. |
e475bba2 MP |
37 | */ |
38 | void blk_set_default_limits(struct queue_limits *lim) | |
39 | { | |
8a78362c | 40 | lim->max_segments = BLK_MAX_SEGMENTS; |
1e739730 | 41 | lim->max_discard_segments = 1; |
13f05c8d | 42 | lim->max_integrity_segments = 0; |
e475bba2 | 43 | lim->seg_boundary_mask = BLK_SEG_BOUNDARY_MASK; |
03100aad | 44 | lim->virt_boundary_mask = 0; |
eb28d31b | 45 | lim->max_segment_size = BLK_MAX_SEGMENT_SIZE; |
5f009d3f KB |
46 | lim->max_sectors = lim->max_hw_sectors = BLK_SAFE_MAX_SECTORS; |
47 | lim->max_dev_sectors = 0; | |
762380ad | 48 | lim->chunk_sectors = 0; |
4363ac7c | 49 | lim->max_write_same_sectors = 0; |
a6f0788e | 50 | lim->max_write_zeroes_sectors = 0; |
0512a75b | 51 | lim->max_zone_append_sectors = 0; |
86b37281 | 52 | lim->max_discard_sectors = 0; |
0034af03 | 53 | lim->max_hw_discard_sectors = 0; |
86b37281 MP |
54 | lim->discard_granularity = 0; |
55 | lim->discard_alignment = 0; | |
56 | lim->discard_misaligned = 0; | |
e475bba2 | 57 | lim->logical_block_size = lim->physical_block_size = lim->io_min = 512; |
3a02c8e8 | 58 | lim->bounce_pfn = (unsigned long)(BLK_BOUNCE_ANY >> PAGE_SHIFT); |
e475bba2 MP |
59 | lim->alignment_offset = 0; |
60 | lim->io_opt = 0; | |
61 | lim->misaligned = 0; | |
797476b8 | 62 | lim->zoned = BLK_ZONED_NONE; |
e475bba2 MP |
63 | } |
64 | EXPORT_SYMBOL(blk_set_default_limits); | |
65 | ||
b1bd055d MP |
66 | /** |
67 | * blk_set_stacking_limits - set default limits for stacking devices | |
68 | * @lim: the queue_limits structure to reset | |
69 | * | |
70 | * Description: | |
71 | * Returns a queue_limit struct to its default state. Should be used | |
72 | * by stacking drivers like DM that have no internal limits. | |
73 | */ | |
74 | void blk_set_stacking_limits(struct queue_limits *lim) | |
75 | { | |
76 | blk_set_default_limits(lim); | |
77 | ||
78 | /* Inherit limits from component devices */ | |
b1bd055d | 79 | lim->max_segments = USHRT_MAX; |
42c9cdfe | 80 | lim->max_discard_segments = USHRT_MAX; |
b1bd055d | 81 | lim->max_hw_sectors = UINT_MAX; |
d82ae52e | 82 | lim->max_segment_size = UINT_MAX; |
fe86cdce | 83 | lim->max_sectors = UINT_MAX; |
ca369d51 | 84 | lim->max_dev_sectors = UINT_MAX; |
4363ac7c | 85 | lim->max_write_same_sectors = UINT_MAX; |
a6f0788e | 86 | lim->max_write_zeroes_sectors = UINT_MAX; |
0512a75b | 87 | lim->max_zone_append_sectors = UINT_MAX; |
b1bd055d MP |
88 | } |
89 | EXPORT_SYMBOL(blk_set_stacking_limits); | |
90 | ||
86db1e29 JA |
91 | /** |
92 | * blk_queue_bounce_limit - set bounce buffer limit for queue | |
cd0aca2d | 93 | * @q: the request queue for the device |
9f7e45d8 | 94 | * @max_addr: the maximum address the device can handle |
86db1e29 JA |
95 | * |
96 | * Description: | |
97 | * Different hardware can have different requirements as to what pages | |
98 | * it can do I/O directly to. A low level driver can call | |
99 | * blk_queue_bounce_limit to have lower memory pages allocated as bounce | |
9f7e45d8 | 100 | * buffers for doing I/O to pages residing above @max_addr. |
86db1e29 | 101 | **/ |
9f7e45d8 | 102 | void blk_queue_bounce_limit(struct request_queue *q, u64 max_addr) |
86db1e29 | 103 | { |
9f7e45d8 | 104 | unsigned long b_pfn = max_addr >> PAGE_SHIFT; |
86db1e29 JA |
105 | int dma = 0; |
106 | ||
107 | q->bounce_gfp = GFP_NOIO; | |
108 | #if BITS_PER_LONG == 64 | |
cd0aca2d TH |
109 | /* |
110 | * Assume anything <= 4GB can be handled by IOMMU. Actually | |
111 | * some IOMMUs can handle everything, but I don't know of a | |
112 | * way to test this here. | |
113 | */ | |
114 | if (b_pfn < (min_t(u64, 0xffffffffUL, BLK_BOUNCE_HIGH) >> PAGE_SHIFT)) | |
86db1e29 | 115 | dma = 1; |
efb012b3 | 116 | q->limits.bounce_pfn = max(max_low_pfn, b_pfn); |
86db1e29 | 117 | #else |
6728cb0e | 118 | if (b_pfn < blk_max_low_pfn) |
86db1e29 | 119 | dma = 1; |
c49825fa | 120 | q->limits.bounce_pfn = b_pfn; |
260a67a9 | 121 | #endif |
86db1e29 JA |
122 | if (dma) { |
123 | init_emergency_isa_pool(); | |
124 | q->bounce_gfp = GFP_NOIO | GFP_DMA; | |
260a67a9 | 125 | q->limits.bounce_pfn = b_pfn; |
86db1e29 JA |
126 | } |
127 | } | |
86db1e29 JA |
128 | EXPORT_SYMBOL(blk_queue_bounce_limit); |
129 | ||
130 | /** | |
ca369d51 MP |
131 | * blk_queue_max_hw_sectors - set max sectors for a request for this queue |
132 | * @q: the request queue for the device | |
2800aac1 | 133 | * @max_hw_sectors: max hardware sectors in the usual 512b unit |
86db1e29 JA |
134 | * |
135 | * Description: | |
2800aac1 MP |
136 | * Enables a low level driver to set a hard upper limit, |
137 | * max_hw_sectors, on the size of requests. max_hw_sectors is set by | |
4f258a46 MP |
138 | * the device driver based upon the capabilities of the I/O |
139 | * controller. | |
2800aac1 | 140 | * |
ca369d51 MP |
141 | * max_dev_sectors is a hard limit imposed by the storage device for |
142 | * READ/WRITE requests. It is set by the disk driver. | |
143 | * | |
2800aac1 MP |
144 | * max_sectors is a soft limit imposed by the block layer for |
145 | * filesystem type requests. This value can be overridden on a | |
146 | * per-device basis in /sys/block/<device>/queue/max_sectors_kb. | |
147 | * The soft limit can not exceed max_hw_sectors. | |
86db1e29 | 148 | **/ |
ca369d51 | 149 | void blk_queue_max_hw_sectors(struct request_queue *q, unsigned int max_hw_sectors) |
86db1e29 | 150 | { |
ca369d51 MP |
151 | struct queue_limits *limits = &q->limits; |
152 | unsigned int max_sectors; | |
153 | ||
09cbfeaf KS |
154 | if ((max_hw_sectors << 9) < PAGE_SIZE) { |
155 | max_hw_sectors = 1 << (PAGE_SHIFT - 9); | |
24c03d47 | 156 | printk(KERN_INFO "%s: set to minimum %d\n", |
2800aac1 | 157 | __func__, max_hw_sectors); |
86db1e29 JA |
158 | } |
159 | ||
30e2bc08 | 160 | limits->max_hw_sectors = max_hw_sectors; |
ca369d51 MP |
161 | max_sectors = min_not_zero(max_hw_sectors, limits->max_dev_sectors); |
162 | max_sectors = min_t(unsigned int, max_sectors, BLK_DEF_MAX_SECTORS); | |
163 | limits->max_sectors = max_sectors; | |
dc3b17cc | 164 | q->backing_dev_info->io_pages = max_sectors >> (PAGE_SHIFT - 9); |
86db1e29 | 165 | } |
086fa5ff | 166 | EXPORT_SYMBOL(blk_queue_max_hw_sectors); |
86db1e29 | 167 | |
762380ad JA |
168 | /** |
169 | * blk_queue_chunk_sectors - set size of the chunk for this queue | |
170 | * @q: the request queue for the device | |
171 | * @chunk_sectors: chunk sectors in the usual 512b unit | |
172 | * | |
173 | * Description: | |
174 | * If a driver doesn't want IOs to cross a given chunk size, it can set | |
175 | * this limit and prevent merging across chunks. Note that the chunk size | |
58a4915a JA |
176 | * must currently be a power-of-2 in sectors. Also note that the block |
177 | * layer must accept a page worth of data at any offset. So if the | |
178 | * crossing of chunks is a hard limitation in the driver, it must still be | |
179 | * prepared to split single page bios. | |
762380ad JA |
180 | **/ |
181 | void blk_queue_chunk_sectors(struct request_queue *q, unsigned int chunk_sectors) | |
182 | { | |
183 | BUG_ON(!is_power_of_2(chunk_sectors)); | |
184 | q->limits.chunk_sectors = chunk_sectors; | |
185 | } | |
186 | EXPORT_SYMBOL(blk_queue_chunk_sectors); | |
187 | ||
67efc925 CH |
188 | /** |
189 | * blk_queue_max_discard_sectors - set max sectors for a single discard | |
190 | * @q: the request queue for the device | |
c7ebf065 | 191 | * @max_discard_sectors: maximum number of sectors to discard |
67efc925 CH |
192 | **/ |
193 | void blk_queue_max_discard_sectors(struct request_queue *q, | |
194 | unsigned int max_discard_sectors) | |
195 | { | |
0034af03 | 196 | q->limits.max_hw_discard_sectors = max_discard_sectors; |
67efc925 CH |
197 | q->limits.max_discard_sectors = max_discard_sectors; |
198 | } | |
199 | EXPORT_SYMBOL(blk_queue_max_discard_sectors); | |
200 | ||
4363ac7c MP |
201 | /** |
202 | * blk_queue_max_write_same_sectors - set max sectors for a single write same | |
203 | * @q: the request queue for the device | |
204 | * @max_write_same_sectors: maximum number of sectors to write per command | |
205 | **/ | |
206 | void blk_queue_max_write_same_sectors(struct request_queue *q, | |
207 | unsigned int max_write_same_sectors) | |
208 | { | |
209 | q->limits.max_write_same_sectors = max_write_same_sectors; | |
210 | } | |
211 | EXPORT_SYMBOL(blk_queue_max_write_same_sectors); | |
212 | ||
a6f0788e CK |
213 | /** |
214 | * blk_queue_max_write_zeroes_sectors - set max sectors for a single | |
215 | * write zeroes | |
216 | * @q: the request queue for the device | |
217 | * @max_write_zeroes_sectors: maximum number of sectors to write per command | |
218 | **/ | |
219 | void blk_queue_max_write_zeroes_sectors(struct request_queue *q, | |
220 | unsigned int max_write_zeroes_sectors) | |
221 | { | |
222 | q->limits.max_write_zeroes_sectors = max_write_zeroes_sectors; | |
223 | } | |
224 | EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors); | |
225 | ||
0512a75b KB |
226 | /** |
227 | * blk_queue_max_zone_append_sectors - set max sectors for a single zone append | |
228 | * @q: the request queue for the device | |
229 | * @max_zone_append_sectors: maximum number of sectors to write per command | |
230 | **/ | |
231 | void blk_queue_max_zone_append_sectors(struct request_queue *q, | |
232 | unsigned int max_zone_append_sectors) | |
233 | { | |
234 | unsigned int max_sectors; | |
235 | ||
236 | if (WARN_ON(!blk_queue_is_zoned(q))) | |
237 | return; | |
238 | ||
239 | max_sectors = min(q->limits.max_hw_sectors, max_zone_append_sectors); | |
240 | max_sectors = min(q->limits.chunk_sectors, max_sectors); | |
241 | ||
242 | /* | |
243 | * Signal eventual driver bugs resulting in the max_zone_append sectors limit | |
244 | * being 0 due to a 0 argument, the chunk_sectors limit (zone size) not set, | |
245 | * or the max_hw_sectors limit not set. | |
246 | */ | |
247 | WARN_ON(!max_sectors); | |
248 | ||
249 | q->limits.max_zone_append_sectors = max_sectors; | |
250 | } | |
251 | EXPORT_SYMBOL_GPL(blk_queue_max_zone_append_sectors); | |
252 | ||
86db1e29 | 253 | /** |
8a78362c | 254 | * blk_queue_max_segments - set max hw segments for a request for this queue |
86db1e29 JA |
255 | * @q: the request queue for the device |
256 | * @max_segments: max number of segments | |
257 | * | |
258 | * Description: | |
259 | * Enables a low level driver to set an upper limit on the number of | |
8a78362c | 260 | * hw data segments in a request. |
86db1e29 | 261 | **/ |
8a78362c | 262 | void blk_queue_max_segments(struct request_queue *q, unsigned short max_segments) |
86db1e29 JA |
263 | { |
264 | if (!max_segments) { | |
265 | max_segments = 1; | |
24c03d47 HH |
266 | printk(KERN_INFO "%s: set to minimum %d\n", |
267 | __func__, max_segments); | |
86db1e29 JA |
268 | } |
269 | ||
8a78362c | 270 | q->limits.max_segments = max_segments; |
86db1e29 | 271 | } |
8a78362c | 272 | EXPORT_SYMBOL(blk_queue_max_segments); |
86db1e29 | 273 | |
1e739730 CH |
274 | /** |
275 | * blk_queue_max_discard_segments - set max segments for discard requests | |
276 | * @q: the request queue for the device | |
277 | * @max_segments: max number of segments | |
278 | * | |
279 | * Description: | |
280 | * Enables a low level driver to set an upper limit on the number of | |
281 | * segments in a discard request. | |
282 | **/ | |
283 | void blk_queue_max_discard_segments(struct request_queue *q, | |
284 | unsigned short max_segments) | |
285 | { | |
286 | q->limits.max_discard_segments = max_segments; | |
287 | } | |
288 | EXPORT_SYMBOL_GPL(blk_queue_max_discard_segments); | |
289 | ||
86db1e29 JA |
290 | /** |
291 | * blk_queue_max_segment_size - set max segment size for blk_rq_map_sg | |
292 | * @q: the request queue for the device | |
293 | * @max_size: max size of segment in bytes | |
294 | * | |
295 | * Description: | |
296 | * Enables a low level driver to set an upper limit on the size of a | |
297 | * coalesced segment | |
298 | **/ | |
299 | void blk_queue_max_segment_size(struct request_queue *q, unsigned int max_size) | |
300 | { | |
09cbfeaf KS |
301 | if (max_size < PAGE_SIZE) { |
302 | max_size = PAGE_SIZE; | |
24c03d47 HH |
303 | printk(KERN_INFO "%s: set to minimum %d\n", |
304 | __func__, max_size); | |
86db1e29 JA |
305 | } |
306 | ||
09324d32 CH |
307 | /* see blk_queue_virt_boundary() for the explanation */ |
308 | WARN_ON_ONCE(q->limits.virt_boundary_mask); | |
309 | ||
025146e1 | 310 | q->limits.max_segment_size = max_size; |
86db1e29 | 311 | } |
86db1e29 JA |
312 | EXPORT_SYMBOL(blk_queue_max_segment_size); |
313 | ||
314 | /** | |
e1defc4f | 315 | * blk_queue_logical_block_size - set logical block size for the queue |
86db1e29 | 316 | * @q: the request queue for the device |
e1defc4f | 317 | * @size: the logical block size, in bytes |
86db1e29 JA |
318 | * |
319 | * Description: | |
e1defc4f MP |
320 | * This should be set to the lowest possible block size that the |
321 | * storage device can address. The default of 512 covers most | |
322 | * hardware. | |
86db1e29 | 323 | **/ |
ad6bf88a | 324 | void blk_queue_logical_block_size(struct request_queue *q, unsigned int size) |
86db1e29 | 325 | { |
025146e1 | 326 | q->limits.logical_block_size = size; |
c72758f3 MP |
327 | |
328 | if (q->limits.physical_block_size < size) | |
329 | q->limits.physical_block_size = size; | |
330 | ||
331 | if (q->limits.io_min < q->limits.physical_block_size) | |
332 | q->limits.io_min = q->limits.physical_block_size; | |
86db1e29 | 333 | } |
e1defc4f | 334 | EXPORT_SYMBOL(blk_queue_logical_block_size); |
86db1e29 | 335 | |
c72758f3 MP |
336 | /** |
337 | * blk_queue_physical_block_size - set physical block size for the queue | |
338 | * @q: the request queue for the device | |
339 | * @size: the physical block size, in bytes | |
340 | * | |
341 | * Description: | |
342 | * This should be set to the lowest possible sector size that the | |
343 | * hardware can operate on without reverting to read-modify-write | |
344 | * operations. | |
345 | */ | |
892b6f90 | 346 | void blk_queue_physical_block_size(struct request_queue *q, unsigned int size) |
c72758f3 MP |
347 | { |
348 | q->limits.physical_block_size = size; | |
349 | ||
350 | if (q->limits.physical_block_size < q->limits.logical_block_size) | |
351 | q->limits.physical_block_size = q->limits.logical_block_size; | |
352 | ||
353 | if (q->limits.io_min < q->limits.physical_block_size) | |
354 | q->limits.io_min = q->limits.physical_block_size; | |
355 | } | |
356 | EXPORT_SYMBOL(blk_queue_physical_block_size); | |
357 | ||
358 | /** | |
359 | * blk_queue_alignment_offset - set physical block alignment offset | |
360 | * @q: the request queue for the device | |
8ebf9756 | 361 | * @offset: alignment offset in bytes |
c72758f3 MP |
362 | * |
363 | * Description: | |
364 | * Some devices are naturally misaligned to compensate for things like | |
365 | * the legacy DOS partition table 63-sector offset. Low-level drivers | |
366 | * should call this function for devices whose first sector is not | |
367 | * naturally aligned. | |
368 | */ | |
369 | void blk_queue_alignment_offset(struct request_queue *q, unsigned int offset) | |
370 | { | |
371 | q->limits.alignment_offset = | |
372 | offset & (q->limits.physical_block_size - 1); | |
373 | q->limits.misaligned = 0; | |
374 | } | |
375 | EXPORT_SYMBOL(blk_queue_alignment_offset); | |
376 | ||
7c958e32 MP |
377 | /** |
378 | * blk_limits_io_min - set minimum request size for a device | |
379 | * @limits: the queue limits | |
380 | * @min: smallest I/O size in bytes | |
381 | * | |
382 | * Description: | |
383 | * Some devices have an internal block size bigger than the reported | |
384 | * hardware sector size. This function can be used to signal the | |
385 | * smallest I/O the device can perform without incurring a performance | |
386 | * penalty. | |
387 | */ | |
388 | void blk_limits_io_min(struct queue_limits *limits, unsigned int min) | |
389 | { | |
390 | limits->io_min = min; | |
391 | ||
392 | if (limits->io_min < limits->logical_block_size) | |
393 | limits->io_min = limits->logical_block_size; | |
394 | ||
395 | if (limits->io_min < limits->physical_block_size) | |
396 | limits->io_min = limits->physical_block_size; | |
397 | } | |
398 | EXPORT_SYMBOL(blk_limits_io_min); | |
399 | ||
c72758f3 MP |
400 | /** |
401 | * blk_queue_io_min - set minimum request size for the queue | |
402 | * @q: the request queue for the device | |
8ebf9756 | 403 | * @min: smallest I/O size in bytes |
c72758f3 MP |
404 | * |
405 | * Description: | |
7e5f5fb0 MP |
406 | * Storage devices may report a granularity or preferred minimum I/O |
407 | * size which is the smallest request the device can perform without | |
408 | * incurring a performance penalty. For disk drives this is often the | |
409 | * physical block size. For RAID arrays it is often the stripe chunk | |
410 | * size. A properly aligned multiple of minimum_io_size is the | |
411 | * preferred request size for workloads where a high number of I/O | |
412 | * operations is desired. | |
c72758f3 MP |
413 | */ |
414 | void blk_queue_io_min(struct request_queue *q, unsigned int min) | |
415 | { | |
7c958e32 | 416 | blk_limits_io_min(&q->limits, min); |
c72758f3 MP |
417 | } |
418 | EXPORT_SYMBOL(blk_queue_io_min); | |
419 | ||
3c5820c7 MP |
420 | /** |
421 | * blk_limits_io_opt - set optimal request size for a device | |
422 | * @limits: the queue limits | |
423 | * @opt: smallest I/O size in bytes | |
424 | * | |
425 | * Description: | |
426 | * Storage devices may report an optimal I/O size, which is the | |
427 | * device's preferred unit for sustained I/O. This is rarely reported | |
428 | * for disk drives. For RAID arrays it is usually the stripe width or | |
429 | * the internal track size. A properly aligned multiple of | |
430 | * optimal_io_size is the preferred request size for workloads where | |
431 | * sustained throughput is desired. | |
432 | */ | |
433 | void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt) | |
434 | { | |
435 | limits->io_opt = opt; | |
436 | } | |
437 | EXPORT_SYMBOL(blk_limits_io_opt); | |
438 | ||
c72758f3 MP |
439 | /** |
440 | * blk_queue_io_opt - set optimal request size for the queue | |
441 | * @q: the request queue for the device | |
8ebf9756 | 442 | * @opt: optimal request size in bytes |
c72758f3 MP |
443 | * |
444 | * Description: | |
7e5f5fb0 MP |
445 | * Storage devices may report an optimal I/O size, which is the |
446 | * device's preferred unit for sustained I/O. This is rarely reported | |
447 | * for disk drives. For RAID arrays it is usually the stripe width or | |
448 | * the internal track size. A properly aligned multiple of | |
449 | * optimal_io_size is the preferred request size for workloads where | |
450 | * sustained throughput is desired. | |
c72758f3 MP |
451 | */ |
452 | void blk_queue_io_opt(struct request_queue *q, unsigned int opt) | |
453 | { | |
3c5820c7 | 454 | blk_limits_io_opt(&q->limits, opt); |
c72758f3 MP |
455 | } |
456 | EXPORT_SYMBOL(blk_queue_io_opt); | |
457 | ||
c72758f3 MP |
458 | /** |
459 | * blk_stack_limits - adjust queue_limits for stacked devices | |
81744ee4 MP |
460 | * @t: the stacking driver limits (top device) |
461 | * @b: the underlying queue limits (bottom, component device) | |
e03a72e1 | 462 | * @start: first data sector within component device |
c72758f3 MP |
463 | * |
464 | * Description: | |
81744ee4 MP |
465 | * This function is used by stacking drivers like MD and DM to ensure |
466 | * that all component devices have compatible block sizes and | |
467 | * alignments. The stacking driver must provide a queue_limits | |
468 | * struct (top) and then iteratively call the stacking function for | |
469 | * all component (bottom) devices. The stacking function will | |
470 | * attempt to combine the values and ensure proper alignment. | |
471 | * | |
472 | * Returns 0 if the top and bottom queue_limits are compatible. The | |
473 | * top device's block sizes and alignment offsets may be adjusted to | |
474 | * ensure alignment with the bottom device. If no compatible sizes | |
475 | * and alignments exist, -1 is returned and the resulting top | |
476 | * queue_limits will have the misaligned flag set to indicate that | |
477 | * the alignment_offset is undefined. | |
c72758f3 MP |
478 | */ |
479 | int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, | |
e03a72e1 | 480 | sector_t start) |
c72758f3 | 481 | { |
e03a72e1 | 482 | unsigned int top, bottom, alignment, ret = 0; |
86b37281 | 483 | |
c72758f3 MP |
484 | t->max_sectors = min_not_zero(t->max_sectors, b->max_sectors); |
485 | t->max_hw_sectors = min_not_zero(t->max_hw_sectors, b->max_hw_sectors); | |
ca369d51 | 486 | t->max_dev_sectors = min_not_zero(t->max_dev_sectors, b->max_dev_sectors); |
4363ac7c MP |
487 | t->max_write_same_sectors = min(t->max_write_same_sectors, |
488 | b->max_write_same_sectors); | |
a6f0788e CK |
489 | t->max_write_zeroes_sectors = min(t->max_write_zeroes_sectors, |
490 | b->max_write_zeroes_sectors); | |
0512a75b KB |
491 | t->max_zone_append_sectors = min(t->max_zone_append_sectors, |
492 | b->max_zone_append_sectors); | |
77634f33 | 493 | t->bounce_pfn = min_not_zero(t->bounce_pfn, b->bounce_pfn); |
c72758f3 MP |
494 | |
495 | t->seg_boundary_mask = min_not_zero(t->seg_boundary_mask, | |
496 | b->seg_boundary_mask); | |
03100aad KB |
497 | t->virt_boundary_mask = min_not_zero(t->virt_boundary_mask, |
498 | b->virt_boundary_mask); | |
c72758f3 | 499 | |
8a78362c | 500 | t->max_segments = min_not_zero(t->max_segments, b->max_segments); |
1e739730 CH |
501 | t->max_discard_segments = min_not_zero(t->max_discard_segments, |
502 | b->max_discard_segments); | |
13f05c8d MP |
503 | t->max_integrity_segments = min_not_zero(t->max_integrity_segments, |
504 | b->max_integrity_segments); | |
c72758f3 MP |
505 | |
506 | t->max_segment_size = min_not_zero(t->max_segment_size, | |
507 | b->max_segment_size); | |
508 | ||
fe0b393f MP |
509 | t->misaligned |= b->misaligned; |
510 | ||
e03a72e1 | 511 | alignment = queue_limit_alignment_offset(b, start); |
9504e086 | 512 | |
81744ee4 MP |
513 | /* Bottom device has different alignment. Check that it is |
514 | * compatible with the current top alignment. | |
515 | */ | |
9504e086 MP |
516 | if (t->alignment_offset != alignment) { |
517 | ||
518 | top = max(t->physical_block_size, t->io_min) | |
519 | + t->alignment_offset; | |
81744ee4 | 520 | bottom = max(b->physical_block_size, b->io_min) + alignment; |
9504e086 | 521 | |
81744ee4 | 522 | /* Verify that top and bottom intervals line up */ |
b8839b8c | 523 | if (max(top, bottom) % min(top, bottom)) { |
9504e086 | 524 | t->misaligned = 1; |
fe0b393f MP |
525 | ret = -1; |
526 | } | |
9504e086 MP |
527 | } |
528 | ||
c72758f3 MP |
529 | t->logical_block_size = max(t->logical_block_size, |
530 | b->logical_block_size); | |
531 | ||
532 | t->physical_block_size = max(t->physical_block_size, | |
533 | b->physical_block_size); | |
534 | ||
535 | t->io_min = max(t->io_min, b->io_min); | |
e9637415 | 536 | t->io_opt = lcm_not_zero(t->io_opt, b->io_opt); |
22ada802 | 537 | t->chunk_sectors = lcm_not_zero(t->chunk_sectors, b->chunk_sectors); |
9504e086 | 538 | |
81744ee4 | 539 | /* Physical block size a multiple of the logical block size? */ |
9504e086 MP |
540 | if (t->physical_block_size & (t->logical_block_size - 1)) { |
541 | t->physical_block_size = t->logical_block_size; | |
c72758f3 | 542 | t->misaligned = 1; |
fe0b393f | 543 | ret = -1; |
86b37281 MP |
544 | } |
545 | ||
81744ee4 | 546 | /* Minimum I/O a multiple of the physical block size? */ |
9504e086 MP |
547 | if (t->io_min & (t->physical_block_size - 1)) { |
548 | t->io_min = t->physical_block_size; | |
549 | t->misaligned = 1; | |
fe0b393f | 550 | ret = -1; |
c72758f3 MP |
551 | } |
552 | ||
81744ee4 | 553 | /* Optimal I/O a multiple of the physical block size? */ |
9504e086 MP |
554 | if (t->io_opt & (t->physical_block_size - 1)) { |
555 | t->io_opt = 0; | |
556 | t->misaligned = 1; | |
fe0b393f | 557 | ret = -1; |
9504e086 | 558 | } |
c72758f3 | 559 | |
22ada802 MS |
560 | /* chunk_sectors a multiple of the physical block size? */ |
561 | if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) { | |
562 | t->chunk_sectors = 0; | |
563 | t->misaligned = 1; | |
564 | ret = -1; | |
565 | } | |
566 | ||
c78afc62 KO |
567 | t->raid_partial_stripes_expensive = |
568 | max(t->raid_partial_stripes_expensive, | |
569 | b->raid_partial_stripes_expensive); | |
570 | ||
81744ee4 | 571 | /* Find lowest common alignment_offset */ |
e9637415 | 572 | t->alignment_offset = lcm_not_zero(t->alignment_offset, alignment) |
b8839b8c | 573 | % max(t->physical_block_size, t->io_min); |
86b37281 | 574 | |
81744ee4 | 575 | /* Verify that new alignment_offset is on a logical block boundary */ |
fe0b393f | 576 | if (t->alignment_offset & (t->logical_block_size - 1)) { |
c72758f3 | 577 | t->misaligned = 1; |
fe0b393f MP |
578 | ret = -1; |
579 | } | |
c72758f3 | 580 | |
9504e086 MP |
581 | /* Discard alignment and granularity */ |
582 | if (b->discard_granularity) { | |
e03a72e1 | 583 | alignment = queue_limit_discard_alignment(b, start); |
9504e086 MP |
584 | |
585 | if (t->discard_granularity != 0 && | |
586 | t->discard_alignment != alignment) { | |
587 | top = t->discard_granularity + t->discard_alignment; | |
588 | bottom = b->discard_granularity + alignment; | |
70dd5bf3 | 589 | |
9504e086 | 590 | /* Verify that top and bottom intervals line up */ |
8dd2cb7e | 591 | if ((max(top, bottom) % min(top, bottom)) != 0) |
9504e086 MP |
592 | t->discard_misaligned = 1; |
593 | } | |
594 | ||
81744ee4 MP |
595 | t->max_discard_sectors = min_not_zero(t->max_discard_sectors, |
596 | b->max_discard_sectors); | |
0034af03 JA |
597 | t->max_hw_discard_sectors = min_not_zero(t->max_hw_discard_sectors, |
598 | b->max_hw_discard_sectors); | |
9504e086 MP |
599 | t->discard_granularity = max(t->discard_granularity, |
600 | b->discard_granularity); | |
e9637415 | 601 | t->discard_alignment = lcm_not_zero(t->discard_alignment, alignment) % |
8dd2cb7e | 602 | t->discard_granularity; |
9504e086 | 603 | } |
70dd5bf3 | 604 | |
3093a479 | 605 | t->zoned = max(t->zoned, b->zoned); |
fe0b393f | 606 | return ret; |
c72758f3 | 607 | } |
5d85d324 | 608 | EXPORT_SYMBOL(blk_stack_limits); |
c72758f3 MP |
609 | |
610 | /** | |
611 | * disk_stack_limits - adjust queue limits for stacked drivers | |
77634f33 | 612 | * @disk: MD/DM gendisk (top) |
c72758f3 MP |
613 | * @bdev: the underlying block device (bottom) |
614 | * @offset: offset to beginning of data within component device | |
615 | * | |
616 | * Description: | |
e03a72e1 MP |
617 | * Merges the limits for a top level gendisk and a bottom level |
618 | * block_device. | |
c72758f3 MP |
619 | */ |
620 | void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, | |
621 | sector_t offset) | |
622 | { | |
623 | struct request_queue *t = disk->queue; | |
c72758f3 | 624 | |
9efa82ef CH |
625 | if (blk_stack_limits(&t->limits, &bdev_get_queue(bdev)->limits, |
626 | get_start_sect(bdev) + (offset >> 9)) < 0) { | |
c72758f3 MP |
627 | char top[BDEVNAME_SIZE], bottom[BDEVNAME_SIZE]; |
628 | ||
629 | disk_name(disk, 0, top); | |
630 | bdevname(bdev, bottom); | |
631 | ||
632 | printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n", | |
633 | top, bottom); | |
634 | } | |
e74d93e9 KK |
635 | |
636 | t->backing_dev_info->io_pages = | |
637 | t->limits.max_sectors >> (PAGE_SHIFT - 9); | |
c72758f3 MP |
638 | } |
639 | EXPORT_SYMBOL(disk_stack_limits); | |
640 | ||
27f8221a FT |
641 | /** |
642 | * blk_queue_update_dma_pad - update pad mask | |
643 | * @q: the request queue for the device | |
644 | * @mask: pad mask | |
645 | * | |
646 | * Update dma pad mask. | |
647 | * | |
648 | * Appending pad buffer to a request modifies the last entry of a | |
649 | * scatter list such that it includes the pad buffer. | |
650 | **/ | |
651 | void blk_queue_update_dma_pad(struct request_queue *q, unsigned int mask) | |
652 | { | |
653 | if (mask > q->dma_pad_mask) | |
654 | q->dma_pad_mask = mask; | |
655 | } | |
656 | EXPORT_SYMBOL(blk_queue_update_dma_pad); | |
657 | ||
86db1e29 JA |
658 | /** |
659 | * blk_queue_segment_boundary - set boundary rules for segment merging | |
660 | * @q: the request queue for the device | |
661 | * @mask: the memory boundary mask | |
662 | **/ | |
663 | void blk_queue_segment_boundary(struct request_queue *q, unsigned long mask) | |
664 | { | |
09cbfeaf KS |
665 | if (mask < PAGE_SIZE - 1) { |
666 | mask = PAGE_SIZE - 1; | |
24c03d47 HH |
667 | printk(KERN_INFO "%s: set to minimum %lx\n", |
668 | __func__, mask); | |
86db1e29 JA |
669 | } |
670 | ||
025146e1 | 671 | q->limits.seg_boundary_mask = mask; |
86db1e29 | 672 | } |
86db1e29 JA |
673 | EXPORT_SYMBOL(blk_queue_segment_boundary); |
674 | ||
03100aad KB |
675 | /** |
676 | * blk_queue_virt_boundary - set boundary rules for bio merging | |
677 | * @q: the request queue for the device | |
678 | * @mask: the memory boundary mask | |
679 | **/ | |
680 | void blk_queue_virt_boundary(struct request_queue *q, unsigned long mask) | |
681 | { | |
682 | q->limits.virt_boundary_mask = mask; | |
09324d32 CH |
683 | |
684 | /* | |
685 | * Devices that require a virtual boundary do not support scatter/gather | |
686 | * I/O natively, but instead require a descriptor list entry for each | |
687 | * page (which might not be idential to the Linux PAGE_SIZE). Because | |
688 | * of that they are not limited by our notion of "segment size". | |
689 | */ | |
c6c84f78 CH |
690 | if (mask) |
691 | q->limits.max_segment_size = UINT_MAX; | |
03100aad KB |
692 | } |
693 | EXPORT_SYMBOL(blk_queue_virt_boundary); | |
694 | ||
86db1e29 JA |
695 | /** |
696 | * blk_queue_dma_alignment - set dma length and memory alignment | |
697 | * @q: the request queue for the device | |
698 | * @mask: alignment mask | |
699 | * | |
700 | * description: | |
710027a4 | 701 | * set required memory and length alignment for direct dma transactions. |
8feb4d20 | 702 | * this is used when building direct io requests for the queue. |
86db1e29 JA |
703 | * |
704 | **/ | |
705 | void blk_queue_dma_alignment(struct request_queue *q, int mask) | |
706 | { | |
707 | q->dma_alignment = mask; | |
708 | } | |
86db1e29 JA |
709 | EXPORT_SYMBOL(blk_queue_dma_alignment); |
710 | ||
711 | /** | |
712 | * blk_queue_update_dma_alignment - update dma length and memory alignment | |
713 | * @q: the request queue for the device | |
714 | * @mask: alignment mask | |
715 | * | |
716 | * description: | |
710027a4 | 717 | * update required memory and length alignment for direct dma transactions. |
86db1e29 JA |
718 | * If the requested alignment is larger than the current alignment, then |
719 | * the current queue alignment is updated to the new value, otherwise it | |
720 | * is left alone. The design of this is to allow multiple objects | |
721 | * (driver, device, transport etc) to set their respective | |
722 | * alignments without having them interfere. | |
723 | * | |
724 | **/ | |
725 | void blk_queue_update_dma_alignment(struct request_queue *q, int mask) | |
726 | { | |
727 | BUG_ON(mask > PAGE_SIZE); | |
728 | ||
729 | if (mask > q->dma_alignment) | |
730 | q->dma_alignment = mask; | |
731 | } | |
86db1e29 JA |
732 | EXPORT_SYMBOL(blk_queue_update_dma_alignment); |
733 | ||
d278d4a8 JA |
734 | /** |
735 | * blk_set_queue_depth - tell the block layer about the device queue depth | |
736 | * @q: the request queue for the device | |
737 | * @depth: queue depth | |
738 | * | |
739 | */ | |
740 | void blk_set_queue_depth(struct request_queue *q, unsigned int depth) | |
741 | { | |
742 | q->queue_depth = depth; | |
9677a3e0 | 743 | rq_qos_queue_depth_changed(q); |
d278d4a8 JA |
744 | } |
745 | EXPORT_SYMBOL(blk_set_queue_depth); | |
746 | ||
93e9d8e8 JA |
747 | /** |
748 | * blk_queue_write_cache - configure queue's write cache | |
749 | * @q: the request queue for the device | |
750 | * @wc: write back cache on or off | |
751 | * @fua: device supports FUA writes, if true | |
752 | * | |
753 | * Tell the block layer about the write cache of @q. | |
754 | */ | |
755 | void blk_queue_write_cache(struct request_queue *q, bool wc, bool fua) | |
756 | { | |
c888a8f9 | 757 | if (wc) |
57d74df9 | 758 | blk_queue_flag_set(QUEUE_FLAG_WC, q); |
c888a8f9 | 759 | else |
57d74df9 | 760 | blk_queue_flag_clear(QUEUE_FLAG_WC, q); |
c888a8f9 | 761 | if (fua) |
57d74df9 | 762 | blk_queue_flag_set(QUEUE_FLAG_FUA, q); |
c888a8f9 | 763 | else |
57d74df9 | 764 | blk_queue_flag_clear(QUEUE_FLAG_FUA, q); |
87760e5e | 765 | |
a7905043 | 766 | wbt_set_write_cache(q, test_bit(QUEUE_FLAG_WC, &q->queue_flags)); |
93e9d8e8 JA |
767 | } |
768 | EXPORT_SYMBOL_GPL(blk_queue_write_cache); | |
769 | ||
68c43f13 DLM |
770 | /** |
771 | * blk_queue_required_elevator_features - Set a queue required elevator features | |
772 | * @q: the request queue for the target device | |
773 | * @features: Required elevator features OR'ed together | |
774 | * | |
775 | * Tell the block layer that for the device controlled through @q, only the | |
776 | * only elevators that can be used are those that implement at least the set of | |
777 | * features specified by @features. | |
778 | */ | |
779 | void blk_queue_required_elevator_features(struct request_queue *q, | |
780 | unsigned int features) | |
781 | { | |
782 | q->required_elevator_features = features; | |
783 | } | |
784 | EXPORT_SYMBOL_GPL(blk_queue_required_elevator_features); | |
785 | ||
45147fb5 YS |
786 | /** |
787 | * blk_queue_can_use_dma_map_merging - configure queue for merging segments. | |
788 | * @q: the request queue for the device | |
789 | * @dev: the device pointer for dma | |
790 | * | |
791 | * Tell the block layer about merging the segments by dma map of @q. | |
792 | */ | |
793 | bool blk_queue_can_use_dma_map_merging(struct request_queue *q, | |
794 | struct device *dev) | |
795 | { | |
796 | unsigned long boundary = dma_get_merge_boundary(dev); | |
797 | ||
798 | if (!boundary) | |
799 | return false; | |
800 | ||
801 | /* No need to update max_segment_size. see blk_queue_virt_boundary() */ | |
802 | blk_queue_virt_boundary(q, boundary); | |
803 | ||
804 | return true; | |
805 | } | |
806 | EXPORT_SYMBOL_GPL(blk_queue_can_use_dma_map_merging); | |
807 | ||
aeb3d3a8 | 808 | static int __init blk_settings_init(void) |
86db1e29 JA |
809 | { |
810 | blk_max_low_pfn = max_low_pfn - 1; | |
811 | blk_max_pfn = max_pfn - 1; | |
812 | return 0; | |
813 | } | |
814 | subsys_initcall(blk_settings_init); |