Commit | Line | Data |
---|---|---|
8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
00e04393 OS |
2 | /* |
3 | * The Kyber I/O scheduler. Controls latency by throttling queue depths using | |
4 | * scalable techniques. | |
5 | * | |
6 | * Copyright (C) 2017 Facebook | |
00e04393 OS |
7 | */ |
8 | ||
9 | #include <linux/kernel.h> | |
10 | #include <linux/blkdev.h> | |
11 | #include <linux/blk-mq.h> | |
00e04393 OS |
12 | #include <linux/module.h> |
13 | #include <linux/sbitmap.h> | |
14 | ||
b357e4a6 CK |
15 | #include <trace/events/block.h> |
16 | ||
2e9bc346 | 17 | #include "elevator.h" |
00e04393 OS |
18 | #include "blk.h" |
19 | #include "blk-mq.h" | |
16b738f6 | 20 | #include "blk-mq-debugfs.h" |
00e04393 OS |
21 | #include "blk-mq-sched.h" |
22 | #include "blk-mq-tag.h" | |
00e04393 | 23 | |
6c3b7af1 OS |
24 | #define CREATE_TRACE_POINTS |
25 | #include <trace/events/kyber.h> | |
26 | ||
6e25cb01 OS |
27 | /* |
28 | * Scheduling domains: the device is divided into multiple domains based on the | |
29 | * request type. | |
30 | */ | |
00e04393 OS |
31 | enum { |
32 | KYBER_READ, | |
6e25cb01 OS |
33 | KYBER_WRITE, |
34 | KYBER_DISCARD, | |
35 | KYBER_OTHER, | |
00e04393 OS |
36 | KYBER_NUM_DOMAINS, |
37 | }; | |
38 | ||
6c3b7af1 OS |
39 | static const char *kyber_domain_names[] = { |
40 | [KYBER_READ] = "READ", | |
41 | [KYBER_WRITE] = "WRITE", | |
42 | [KYBER_DISCARD] = "DISCARD", | |
43 | [KYBER_OTHER] = "OTHER", | |
44 | }; | |
45 | ||
00e04393 | 46 | enum { |
00e04393 OS |
47 | /* |
48 | * In order to prevent starvation of synchronous requests by a flood of | |
49 | * asynchronous requests, we reserve 25% of requests for synchronous | |
50 | * operations. | |
51 | */ | |
52 | KYBER_ASYNC_PERCENT = 75, | |
53 | }; | |
54 | ||
55 | /* | |
6e25cb01 | 56 | * Maximum device-wide depth for each scheduling domain. |
00e04393 | 57 | * |
6e25cb01 OS |
58 | * Even for fast devices with lots of tags like NVMe, you can saturate the |
59 | * device with only a fraction of the maximum possible queue depth. So, we cap | |
60 | * these to a reasonable value. | |
00e04393 OS |
61 | */ |
62 | static const unsigned int kyber_depth[] = { | |
63 | [KYBER_READ] = 256, | |
6e25cb01 OS |
64 | [KYBER_WRITE] = 128, |
65 | [KYBER_DISCARD] = 64, | |
66 | [KYBER_OTHER] = 16, | |
00e04393 OS |
67 | }; |
68 | ||
69 | /* | |
6e25cb01 OS |
70 | * Default latency targets for each scheduling domain. |
71 | */ | |
72 | static const u64 kyber_latency_targets[] = { | |
f0a0cddd OS |
73 | [KYBER_READ] = 2ULL * NSEC_PER_MSEC, |
74 | [KYBER_WRITE] = 10ULL * NSEC_PER_MSEC, | |
75 | [KYBER_DISCARD] = 5ULL * NSEC_PER_SEC, | |
6e25cb01 OS |
76 | }; |
77 | ||
78 | /* | |
79 | * Batch size (number of requests we'll dispatch in a row) for each scheduling | |
80 | * domain. | |
00e04393 OS |
81 | */ |
82 | static const unsigned int kyber_batch_size[] = { | |
83 | [KYBER_READ] = 16, | |
6e25cb01 OS |
84 | [KYBER_WRITE] = 8, |
85 | [KYBER_DISCARD] = 1, | |
86 | [KYBER_OTHER] = 1, | |
87 | }; | |
88 | ||
89 | /* | |
90 | * Requests latencies are recorded in a histogram with buckets defined relative | |
91 | * to the target latency: | |
92 | * | |
93 | * <= 1/4 * target latency | |
94 | * <= 1/2 * target latency | |
95 | * <= 3/4 * target latency | |
96 | * <= target latency | |
97 | * <= 1 1/4 * target latency | |
98 | * <= 1 1/2 * target latency | |
99 | * <= 1 3/4 * target latency | |
100 | * > 1 3/4 * target latency | |
101 | */ | |
102 | enum { | |
103 | /* | |
104 | * The width of the latency histogram buckets is | |
105 | * 1 / (1 << KYBER_LATENCY_SHIFT) * target latency. | |
106 | */ | |
107 | KYBER_LATENCY_SHIFT = 2, | |
108 | /* | |
109 | * The first (1 << KYBER_LATENCY_SHIFT) buckets are <= target latency, | |
110 | * thus, "good". | |
111 | */ | |
112 | KYBER_GOOD_BUCKETS = 1 << KYBER_LATENCY_SHIFT, | |
113 | /* There are also (1 << KYBER_LATENCY_SHIFT) "bad" buckets. */ | |
114 | KYBER_LATENCY_BUCKETS = 2 << KYBER_LATENCY_SHIFT, | |
115 | }; | |
116 | ||
117 | /* | |
118 | * We measure both the total latency and the I/O latency (i.e., latency after | |
119 | * submitting to the device). | |
120 | */ | |
121 | enum { | |
122 | KYBER_TOTAL_LATENCY, | |
123 | KYBER_IO_LATENCY, | |
124 | }; | |
125 | ||
6c3b7af1 OS |
126 | static const char *kyber_latency_type_names[] = { |
127 | [KYBER_TOTAL_LATENCY] = "total", | |
128 | [KYBER_IO_LATENCY] = "I/O", | |
129 | }; | |
130 | ||
6e25cb01 OS |
131 | /* |
132 | * Per-cpu latency histograms: total latency and I/O latency for each scheduling | |
133 | * domain except for KYBER_OTHER. | |
134 | */ | |
135 | struct kyber_cpu_latency { | |
136 | atomic_t buckets[KYBER_OTHER][2][KYBER_LATENCY_BUCKETS]; | |
00e04393 OS |
137 | }; |
138 | ||
a6088845 JW |
139 | /* |
140 | * There is a same mapping between ctx & hctx and kcq & khd, | |
141 | * we use request->mq_ctx->index_hw to index the kcq in khd. | |
142 | */ | |
143 | struct kyber_ctx_queue { | |
144 | /* | |
145 | * Used to ensure operations on rq_list and kcq_map to be an atmoic one. | |
146 | * Also protect the rqs on rq_list when merge. | |
147 | */ | |
148 | spinlock_t lock; | |
149 | struct list_head rq_list[KYBER_NUM_DOMAINS]; | |
150 | } ____cacheline_aligned_in_smp; | |
151 | ||
00e04393 | 152 | struct kyber_queue_data { |
6c3b7af1 | 153 | struct request_queue *q; |
c4110804 | 154 | dev_t dev; |
6c3b7af1 | 155 | |
00e04393 | 156 | /* |
6e25cb01 OS |
157 | * Each scheduling domain has a limited number of in-flight requests |
158 | * device-wide, limited by these tokens. | |
00e04393 OS |
159 | */ |
160 | struct sbitmap_queue domain_tokens[KYBER_NUM_DOMAINS]; | |
161 | ||
162 | /* | |
163 | * Async request percentage, converted to per-word depth for | |
164 | * sbitmap_get_shallow(). | |
165 | */ | |
166 | unsigned int async_depth; | |
167 | ||
6e25cb01 OS |
168 | struct kyber_cpu_latency __percpu *cpu_latency; |
169 | ||
170 | /* Timer for stats aggregation and adjusting domain tokens. */ | |
171 | struct timer_list timer; | |
172 | ||
173 | unsigned int latency_buckets[KYBER_OTHER][2][KYBER_LATENCY_BUCKETS]; | |
174 | ||
175 | unsigned long latency_timeout[KYBER_OTHER]; | |
176 | ||
177 | int domain_p99[KYBER_OTHER]; | |
178 | ||
00e04393 | 179 | /* Target latencies in nanoseconds. */ |
6e25cb01 | 180 | u64 latency_targets[KYBER_OTHER]; |
00e04393 OS |
181 | }; |
182 | ||
183 | struct kyber_hctx_data { | |
184 | spinlock_t lock; | |
185 | struct list_head rqs[KYBER_NUM_DOMAINS]; | |
186 | unsigned int cur_domain; | |
187 | unsigned int batching; | |
a6088845 JW |
188 | struct kyber_ctx_queue *kcqs; |
189 | struct sbitmap kcq_map[KYBER_NUM_DOMAINS]; | |
00203ba4 | 190 | struct sbq_wait domain_wait[KYBER_NUM_DOMAINS]; |
fcf38cdf | 191 | struct sbq_wait_state *domain_ws[KYBER_NUM_DOMAINS]; |
00e04393 OS |
192 | atomic_t wait_index[KYBER_NUM_DOMAINS]; |
193 | }; | |
194 | ||
fcf38cdf OS |
195 | static int kyber_domain_wake(wait_queue_entry_t *wait, unsigned mode, int flags, |
196 | void *key); | |
197 | ||
a6088845 | 198 | static unsigned int kyber_sched_domain(unsigned int op) |
00e04393 | 199 | { |
6e25cb01 OS |
200 | switch (op & REQ_OP_MASK) { |
201 | case REQ_OP_READ: | |
00e04393 | 202 | return KYBER_READ; |
6e25cb01 OS |
203 | case REQ_OP_WRITE: |
204 | return KYBER_WRITE; | |
205 | case REQ_OP_DISCARD: | |
206 | return KYBER_DISCARD; | |
207 | default: | |
00e04393 | 208 | return KYBER_OTHER; |
6e25cb01 | 209 | } |
00e04393 OS |
210 | } |
211 | ||
6e25cb01 OS |
212 | static void flush_latency_buckets(struct kyber_queue_data *kqd, |
213 | struct kyber_cpu_latency *cpu_latency, | |
214 | unsigned int sched_domain, unsigned int type) | |
00e04393 | 215 | { |
6e25cb01 OS |
216 | unsigned int *buckets = kqd->latency_buckets[sched_domain][type]; |
217 | atomic_t *cpu_buckets = cpu_latency->buckets[sched_domain][type]; | |
218 | unsigned int bucket; | |
00e04393 | 219 | |
6e25cb01 OS |
220 | for (bucket = 0; bucket < KYBER_LATENCY_BUCKETS; bucket++) |
221 | buckets[bucket] += atomic_xchg(&cpu_buckets[bucket], 0); | |
00e04393 OS |
222 | } |
223 | ||
224 | /* | |
6e25cb01 OS |
225 | * Calculate the histogram bucket with the given percentile rank, or -1 if there |
226 | * aren't enough samples yet. | |
00e04393 | 227 | */ |
6e25cb01 OS |
228 | static int calculate_percentile(struct kyber_queue_data *kqd, |
229 | unsigned int sched_domain, unsigned int type, | |
230 | unsigned int percentile) | |
00e04393 | 231 | { |
6e25cb01 OS |
232 | unsigned int *buckets = kqd->latency_buckets[sched_domain][type]; |
233 | unsigned int bucket, samples = 0, percentile_samples; | |
234 | ||
235 | for (bucket = 0; bucket < KYBER_LATENCY_BUCKETS; bucket++) | |
236 | samples += buckets[bucket]; | |
237 | ||
238 | if (!samples) | |
239 | return -1; | |
00e04393 OS |
240 | |
241 | /* | |
6e25cb01 OS |
242 | * We do the calculation once we have 500 samples or one second passes |
243 | * since the first sample was recorded, whichever comes first. | |
00e04393 | 244 | */ |
6e25cb01 OS |
245 | if (!kqd->latency_timeout[sched_domain]) |
246 | kqd->latency_timeout[sched_domain] = max(jiffies + HZ, 1UL); | |
247 | if (samples < 500 && | |
248 | time_is_after_jiffies(kqd->latency_timeout[sched_domain])) { | |
249 | return -1; | |
250 | } | |
251 | kqd->latency_timeout[sched_domain] = 0; | |
00e04393 | 252 | |
6e25cb01 OS |
253 | percentile_samples = DIV_ROUND_UP(samples * percentile, 100); |
254 | for (bucket = 0; bucket < KYBER_LATENCY_BUCKETS - 1; bucket++) { | |
255 | if (buckets[bucket] >= percentile_samples) | |
00e04393 | 256 | break; |
6e25cb01 | 257 | percentile_samples -= buckets[bucket]; |
00e04393 | 258 | } |
6e25cb01 | 259 | memset(buckets, 0, sizeof(kqd->latency_buckets[sched_domain][type])); |
00e04393 | 260 | |
c4110804 | 261 | trace_kyber_latency(kqd->dev, kyber_domain_names[sched_domain], |
6c3b7af1 OS |
262 | kyber_latency_type_names[type], percentile, |
263 | bucket + 1, 1 << KYBER_LATENCY_SHIFT, samples); | |
264 | ||
6e25cb01 OS |
265 | return bucket; |
266 | } | |
267 | ||
268 | static void kyber_resize_domain(struct kyber_queue_data *kqd, | |
269 | unsigned int sched_domain, unsigned int depth) | |
270 | { | |
00e04393 | 271 | depth = clamp(depth, 1U, kyber_depth[sched_domain]); |
6c3b7af1 | 272 | if (depth != kqd->domain_tokens[sched_domain].sb.depth) { |
00e04393 | 273 | sbitmap_queue_resize(&kqd->domain_tokens[sched_domain], depth); |
c4110804 | 274 | trace_kyber_adjust(kqd->dev, kyber_domain_names[sched_domain], |
6c3b7af1 OS |
275 | depth); |
276 | } | |
00e04393 OS |
277 | } |
278 | ||
6e25cb01 OS |
279 | static void kyber_timer_fn(struct timer_list *t) |
280 | { | |
281 | struct kyber_queue_data *kqd = from_timer(kqd, t, timer); | |
282 | unsigned int sched_domain; | |
283 | int cpu; | |
284 | bool bad = false; | |
285 | ||
286 | /* Sum all of the per-cpu latency histograms. */ | |
287 | for_each_online_cpu(cpu) { | |
288 | struct kyber_cpu_latency *cpu_latency; | |
289 | ||
290 | cpu_latency = per_cpu_ptr(kqd->cpu_latency, cpu); | |
291 | for (sched_domain = 0; sched_domain < KYBER_OTHER; sched_domain++) { | |
292 | flush_latency_buckets(kqd, cpu_latency, sched_domain, | |
293 | KYBER_TOTAL_LATENCY); | |
294 | flush_latency_buckets(kqd, cpu_latency, sched_domain, | |
295 | KYBER_IO_LATENCY); | |
00e04393 OS |
296 | } |
297 | } | |
298 | ||
6e25cb01 OS |
299 | /* |
300 | * Check if any domains have a high I/O latency, which might indicate | |
301 | * congestion in the device. Note that we use the p90; we don't want to | |
302 | * be too sensitive to outliers here. | |
303 | */ | |
304 | for (sched_domain = 0; sched_domain < KYBER_OTHER; sched_domain++) { | |
305 | int p90; | |
00e04393 | 306 | |
6e25cb01 OS |
307 | p90 = calculate_percentile(kqd, sched_domain, KYBER_IO_LATENCY, |
308 | 90); | |
309 | if (p90 >= KYBER_GOOD_BUCKETS) | |
310 | bad = true; | |
311 | } | |
00e04393 OS |
312 | |
313 | /* | |
6e25cb01 OS |
314 | * Adjust the scheduling domain depths. If we determined that there was |
315 | * congestion, we throttle all domains with good latencies. Either way, | |
316 | * we ease up on throttling domains with bad latencies. | |
00e04393 | 317 | */ |
6e25cb01 OS |
318 | for (sched_domain = 0; sched_domain < KYBER_OTHER; sched_domain++) { |
319 | unsigned int orig_depth, depth; | |
320 | int p99; | |
321 | ||
322 | p99 = calculate_percentile(kqd, sched_domain, | |
323 | KYBER_TOTAL_LATENCY, 99); | |
324 | /* | |
325 | * This is kind of subtle: different domains will not | |
326 | * necessarily have enough samples to calculate the latency | |
327 | * percentiles during the same window, so we have to remember | |
328 | * the p99 for the next time we observe congestion; once we do, | |
329 | * we don't want to throttle again until we get more data, so we | |
330 | * reset it to -1. | |
331 | */ | |
332 | if (bad) { | |
333 | if (p99 < 0) | |
334 | p99 = kqd->domain_p99[sched_domain]; | |
335 | kqd->domain_p99[sched_domain] = -1; | |
336 | } else if (p99 >= 0) { | |
337 | kqd->domain_p99[sched_domain] = p99; | |
338 | } | |
339 | if (p99 < 0) | |
340 | continue; | |
341 | ||
342 | /* | |
343 | * If this domain has bad latency, throttle less. Otherwise, | |
344 | * throttle more iff we determined that there is congestion. | |
345 | * | |
346 | * The new depth is scaled linearly with the p99 latency vs the | |
347 | * latency target. E.g., if the p99 is 3/4 of the target, then | |
348 | * we throttle down to 3/4 of the current depth, and if the p99 | |
349 | * is 2x the target, then we double the depth. | |
350 | */ | |
351 | if (bad || p99 >= KYBER_GOOD_BUCKETS) { | |
352 | orig_depth = kqd->domain_tokens[sched_domain].sb.depth; | |
353 | depth = (orig_depth * (p99 + 1)) >> KYBER_LATENCY_SHIFT; | |
354 | kyber_resize_domain(kqd, sched_domain, depth); | |
355 | } | |
356 | } | |
00e04393 OS |
357 | } |
358 | ||
00e04393 OS |
359 | static struct kyber_queue_data *kyber_queue_data_alloc(struct request_queue *q) |
360 | { | |
361 | struct kyber_queue_data *kqd; | |
00e04393 OS |
362 | int ret = -ENOMEM; |
363 | int i; | |
364 | ||
6e25cb01 | 365 | kqd = kzalloc_node(sizeof(*kqd), GFP_KERNEL, q->node); |
00e04393 OS |
366 | if (!kqd) |
367 | goto err; | |
00e04393 | 368 | |
6c3b7af1 | 369 | kqd->q = q; |
c4110804 | 370 | kqd->dev = disk_devt(q->disk); |
6c3b7af1 | 371 | |
6e25cb01 OS |
372 | kqd->cpu_latency = alloc_percpu_gfp(struct kyber_cpu_latency, |
373 | GFP_KERNEL | __GFP_ZERO); | |
374 | if (!kqd->cpu_latency) | |
00e04393 OS |
375 | goto err_kqd; |
376 | ||
6e25cb01 OS |
377 | timer_setup(&kqd->timer, kyber_timer_fn, 0); |
378 | ||
00e04393 OS |
379 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) { |
380 | WARN_ON(!kyber_depth[i]); | |
381 | WARN_ON(!kyber_batch_size[i]); | |
382 | ret = sbitmap_queue_init_node(&kqd->domain_tokens[i], | |
fa2a1f60 OS |
383 | kyber_depth[i], -1, false, |
384 | GFP_KERNEL, q->node); | |
00e04393 OS |
385 | if (ret) { |
386 | while (--i >= 0) | |
387 | sbitmap_queue_free(&kqd->domain_tokens[i]); | |
6e25cb01 | 388 | goto err_buckets; |
00e04393 | 389 | } |
00e04393 OS |
390 | } |
391 | ||
6e25cb01 OS |
392 | for (i = 0; i < KYBER_OTHER; i++) { |
393 | kqd->domain_p99[i] = -1; | |
394 | kqd->latency_targets[i] = kyber_latency_targets[i]; | |
395 | } | |
00e04393 | 396 | |
00e04393 OS |
397 | return kqd; |
398 | ||
6e25cb01 OS |
399 | err_buckets: |
400 | free_percpu(kqd->cpu_latency); | |
00e04393 OS |
401 | err_kqd: |
402 | kfree(kqd); | |
403 | err: | |
404 | return ERR_PTR(ret); | |
405 | } | |
406 | ||
407 | static int kyber_init_sched(struct request_queue *q, struct elevator_type *e) | |
408 | { | |
409 | struct kyber_queue_data *kqd; | |
410 | struct elevator_queue *eq; | |
411 | ||
412 | eq = elevator_alloc(q, e); | |
413 | if (!eq) | |
414 | return -ENOMEM; | |
415 | ||
416 | kqd = kyber_queue_data_alloc(q); | |
417 | if (IS_ERR(kqd)) { | |
418 | kobject_put(&eq->kobj); | |
419 | return PTR_ERR(kqd); | |
420 | } | |
421 | ||
6e25cb01 OS |
422 | blk_stat_enable_accounting(q); |
423 | ||
00e04393 OS |
424 | eq->elevator_data = kqd; |
425 | q->elevator = eq; | |
426 | ||
00e04393 OS |
427 | return 0; |
428 | } | |
429 | ||
430 | static void kyber_exit_sched(struct elevator_queue *e) | |
431 | { | |
432 | struct kyber_queue_data *kqd = e->elevator_data; | |
00e04393 OS |
433 | int i; |
434 | ||
6e25cb01 | 435 | del_timer_sync(&kqd->timer); |
00e04393 OS |
436 | |
437 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) | |
438 | sbitmap_queue_free(&kqd->domain_tokens[i]); | |
6e25cb01 | 439 | free_percpu(kqd->cpu_latency); |
00e04393 OS |
440 | kfree(kqd); |
441 | } | |
442 | ||
a6088845 JW |
443 | static void kyber_ctx_queue_init(struct kyber_ctx_queue *kcq) |
444 | { | |
445 | unsigned int i; | |
446 | ||
447 | spin_lock_init(&kcq->lock); | |
448 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) | |
449 | INIT_LIST_HEAD(&kcq->rq_list[i]); | |
450 | } | |
451 | ||
ffa772cf | 452 | static void kyber_depth_updated(struct blk_mq_hw_ctx *hctx) |
00e04393 | 453 | { |
28820640 | 454 | struct kyber_queue_data *kqd = hctx->queue->elevator->elevator_data; |
ffa772cf YY |
455 | struct blk_mq_tags *tags = hctx->sched_tags; |
456 | unsigned int shift = tags->bitmap_tags->sb.shift; | |
457 | ||
458 | kqd->async_depth = (1U << shift) * KYBER_ASYNC_PERCENT / 100U; | |
459 | ||
460 | sbitmap_queue_min_shallow_depth(tags->bitmap_tags, kqd->async_depth); | |
461 | } | |
462 | ||
463 | static int kyber_init_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) | |
464 | { | |
00e04393 OS |
465 | struct kyber_hctx_data *khd; |
466 | int i; | |
467 | ||
468 | khd = kmalloc_node(sizeof(*khd), GFP_KERNEL, hctx->numa_node); | |
469 | if (!khd) | |
470 | return -ENOMEM; | |
471 | ||
a6088845 JW |
472 | khd->kcqs = kmalloc_array_node(hctx->nr_ctx, |
473 | sizeof(struct kyber_ctx_queue), | |
474 | GFP_KERNEL, hctx->numa_node); | |
475 | if (!khd->kcqs) | |
476 | goto err_khd; | |
477 | ||
478 | for (i = 0; i < hctx->nr_ctx; i++) | |
479 | kyber_ctx_queue_init(&khd->kcqs[i]); | |
480 | ||
481 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) { | |
482 | if (sbitmap_init_node(&khd->kcq_map[i], hctx->nr_ctx, | |
efe1f3a1 | 483 | ilog2(8), GFP_KERNEL, hctx->numa_node, |
c548e62b | 484 | false, false)) { |
a6088845 JW |
485 | while (--i >= 0) |
486 | sbitmap_free(&khd->kcq_map[i]); | |
487 | goto err_kcqs; | |
488 | } | |
489 | } | |
490 | ||
00e04393 OS |
491 | spin_lock_init(&khd->lock); |
492 | ||
493 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) { | |
494 | INIT_LIST_HEAD(&khd->rqs[i]); | |
00203ba4 JA |
495 | khd->domain_wait[i].sbq = NULL; |
496 | init_waitqueue_func_entry(&khd->domain_wait[i].wait, | |
fcf38cdf | 497 | kyber_domain_wake); |
00203ba4 JA |
498 | khd->domain_wait[i].wait.private = hctx; |
499 | INIT_LIST_HEAD(&khd->domain_wait[i].wait.entry); | |
00e04393 OS |
500 | atomic_set(&khd->wait_index[i], 0); |
501 | } | |
502 | ||
503 | khd->cur_domain = 0; | |
504 | khd->batching = 0; | |
505 | ||
506 | hctx->sched_data = khd; | |
ffa772cf | 507 | kyber_depth_updated(hctx); |
00e04393 OS |
508 | |
509 | return 0; | |
a6088845 JW |
510 | |
511 | err_kcqs: | |
512 | kfree(khd->kcqs); | |
513 | err_khd: | |
514 | kfree(khd); | |
515 | return -ENOMEM; | |
00e04393 OS |
516 | } |
517 | ||
518 | static void kyber_exit_hctx(struct blk_mq_hw_ctx *hctx, unsigned int hctx_idx) | |
519 | { | |
a6088845 JW |
520 | struct kyber_hctx_data *khd = hctx->sched_data; |
521 | int i; | |
522 | ||
523 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) | |
524 | sbitmap_free(&khd->kcq_map[i]); | |
525 | kfree(khd->kcqs); | |
00e04393 OS |
526 | kfree(hctx->sched_data); |
527 | } | |
528 | ||
529 | static int rq_get_domain_token(struct request *rq) | |
530 | { | |
531 | return (long)rq->elv.priv[0]; | |
532 | } | |
533 | ||
534 | static void rq_set_domain_token(struct request *rq, int token) | |
535 | { | |
536 | rq->elv.priv[0] = (void *)(long)token; | |
537 | } | |
538 | ||
539 | static void rq_clear_domain_token(struct kyber_queue_data *kqd, | |
540 | struct request *rq) | |
541 | { | |
542 | unsigned int sched_domain; | |
543 | int nr; | |
544 | ||
545 | nr = rq_get_domain_token(rq); | |
546 | if (nr != -1) { | |
a6088845 | 547 | sched_domain = kyber_sched_domain(rq->cmd_flags); |
00e04393 OS |
548 | sbitmap_queue_clear(&kqd->domain_tokens[sched_domain], nr, |
549 | rq->mq_ctx->cpu); | |
550 | } | |
551 | } | |
552 | ||
5bbf4e5a | 553 | static void kyber_limit_depth(unsigned int op, struct blk_mq_alloc_data *data) |
00e04393 | 554 | { |
00e04393 OS |
555 | /* |
556 | * We use the scheduler tags as per-hardware queue queueing tokens. | |
557 | * Async requests can be limited at this stage. | |
558 | */ | |
5bbf4e5a CH |
559 | if (!op_is_sync(op)) { |
560 | struct kyber_queue_data *kqd = data->q->elevator->elevator_data; | |
561 | ||
00e04393 | 562 | data->shallow_depth = kqd->async_depth; |
5bbf4e5a CH |
563 | } |
564 | } | |
00e04393 | 565 | |
efed9a33 | 566 | static bool kyber_bio_merge(struct request_queue *q, struct bio *bio, |
14ccb66b | 567 | unsigned int nr_segs) |
a6088845 | 568 | { |
efed9a33 OS |
569 | struct blk_mq_ctx *ctx = blk_mq_get_ctx(q); |
570 | struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, bio->bi_opf, ctx); | |
a6088845 | 571 | struct kyber_hctx_data *khd = hctx->sched_data; |
f31967f0 | 572 | struct kyber_ctx_queue *kcq = &khd->kcqs[ctx->index_hw[hctx->type]]; |
a6088845 JW |
573 | unsigned int sched_domain = kyber_sched_domain(bio->bi_opf); |
574 | struct list_head *rq_list = &kcq->rq_list[sched_domain]; | |
575 | bool merged; | |
576 | ||
577 | spin_lock(&kcq->lock); | |
bdc6a287 | 578 | merged = blk_bio_list_merge(hctx->queue, rq_list, bio, nr_segs); |
a6088845 | 579 | spin_unlock(&kcq->lock); |
a6088845 JW |
580 | |
581 | return merged; | |
582 | } | |
583 | ||
5d9c305b | 584 | static void kyber_prepare_request(struct request *rq) |
5bbf4e5a CH |
585 | { |
586 | rq_set_domain_token(rq, -1); | |
00e04393 OS |
587 | } |
588 | ||
a6088845 JW |
589 | static void kyber_insert_requests(struct blk_mq_hw_ctx *hctx, |
590 | struct list_head *rq_list, bool at_head) | |
591 | { | |
592 | struct kyber_hctx_data *khd = hctx->sched_data; | |
593 | struct request *rq, *next; | |
594 | ||
595 | list_for_each_entry_safe(rq, next, rq_list, queuelist) { | |
596 | unsigned int sched_domain = kyber_sched_domain(rq->cmd_flags); | |
f31967f0 | 597 | struct kyber_ctx_queue *kcq = &khd->kcqs[rq->mq_ctx->index_hw[hctx->type]]; |
a6088845 JW |
598 | struct list_head *head = &kcq->rq_list[sched_domain]; |
599 | ||
600 | spin_lock(&kcq->lock); | |
fb7b9b02 | 601 | trace_block_rq_insert(rq); |
a6088845 JW |
602 | if (at_head) |
603 | list_move(&rq->queuelist, head); | |
604 | else | |
605 | list_move_tail(&rq->queuelist, head); | |
606 | sbitmap_set_bit(&khd->kcq_map[sched_domain], | |
f31967f0 | 607 | rq->mq_ctx->index_hw[hctx->type]); |
a6088845 JW |
608 | spin_unlock(&kcq->lock); |
609 | } | |
610 | } | |
611 | ||
7b9e9361 | 612 | static void kyber_finish_request(struct request *rq) |
00e04393 | 613 | { |
7b9e9361 | 614 | struct kyber_queue_data *kqd = rq->q->elevator->elevator_data; |
00e04393 OS |
615 | |
616 | rq_clear_domain_token(kqd, rq); | |
00e04393 OS |
617 | } |
618 | ||
6e25cb01 OS |
619 | static void add_latency_sample(struct kyber_cpu_latency *cpu_latency, |
620 | unsigned int sched_domain, unsigned int type, | |
621 | u64 target, u64 latency) | |
00e04393 | 622 | { |
6e25cb01 OS |
623 | unsigned int bucket; |
624 | u64 divisor; | |
00e04393 | 625 | |
6e25cb01 OS |
626 | if (latency > 0) { |
627 | divisor = max_t(u64, target >> KYBER_LATENCY_SHIFT, 1); | |
628 | bucket = min_t(unsigned int, div64_u64(latency - 1, divisor), | |
629 | KYBER_LATENCY_BUCKETS - 1); | |
630 | } else { | |
631 | bucket = 0; | |
00e04393 OS |
632 | } |
633 | ||
6e25cb01 OS |
634 | atomic_inc(&cpu_latency->buckets[sched_domain][type][bucket]); |
635 | } | |
00e04393 | 636 | |
6e25cb01 OS |
637 | static void kyber_completed_request(struct request *rq, u64 now) |
638 | { | |
639 | struct kyber_queue_data *kqd = rq->q->elevator->elevator_data; | |
640 | struct kyber_cpu_latency *cpu_latency; | |
641 | unsigned int sched_domain; | |
642 | u64 target; | |
643 | ||
644 | sched_domain = kyber_sched_domain(rq->cmd_flags); | |
645 | if (sched_domain == KYBER_OTHER) | |
00e04393 OS |
646 | return; |
647 | ||
6e25cb01 OS |
648 | cpu_latency = get_cpu_ptr(kqd->cpu_latency); |
649 | target = kqd->latency_targets[sched_domain]; | |
650 | add_latency_sample(cpu_latency, sched_domain, KYBER_TOTAL_LATENCY, | |
651 | target, now - rq->start_time_ns); | |
652 | add_latency_sample(cpu_latency, sched_domain, KYBER_IO_LATENCY, target, | |
653 | now - rq->io_start_time_ns); | |
654 | put_cpu_ptr(kqd->cpu_latency); | |
00e04393 | 655 | |
6e25cb01 | 656 | timer_reduce(&kqd->timer, jiffies + HZ / 10); |
00e04393 OS |
657 | } |
658 | ||
a6088845 JW |
659 | struct flush_kcq_data { |
660 | struct kyber_hctx_data *khd; | |
661 | unsigned int sched_domain; | |
662 | struct list_head *list; | |
663 | }; | |
664 | ||
665 | static bool flush_busy_kcq(struct sbitmap *sb, unsigned int bitnr, void *data) | |
00e04393 | 666 | { |
a6088845 JW |
667 | struct flush_kcq_data *flush_data = data; |
668 | struct kyber_ctx_queue *kcq = &flush_data->khd->kcqs[bitnr]; | |
00e04393 | 669 | |
a6088845 JW |
670 | spin_lock(&kcq->lock); |
671 | list_splice_tail_init(&kcq->rq_list[flush_data->sched_domain], | |
672 | flush_data->list); | |
673 | sbitmap_clear_bit(sb, bitnr); | |
674 | spin_unlock(&kcq->lock); | |
00e04393 | 675 | |
a6088845 JW |
676 | return true; |
677 | } | |
678 | ||
679 | static void kyber_flush_busy_kcqs(struct kyber_hctx_data *khd, | |
680 | unsigned int sched_domain, | |
681 | struct list_head *list) | |
682 | { | |
683 | struct flush_kcq_data data = { | |
684 | .khd = khd, | |
685 | .sched_domain = sched_domain, | |
686 | .list = list, | |
687 | }; | |
688 | ||
689 | sbitmap_for_each_set(&khd->kcq_map[sched_domain], | |
690 | flush_busy_kcq, &data); | |
00e04393 OS |
691 | } |
692 | ||
00203ba4 | 693 | static int kyber_domain_wake(wait_queue_entry_t *wqe, unsigned mode, int flags, |
00e04393 OS |
694 | void *key) |
695 | { | |
00203ba4 JA |
696 | struct blk_mq_hw_ctx *hctx = READ_ONCE(wqe->private); |
697 | struct sbq_wait *wait = container_of(wqe, struct sbq_wait, wait); | |
00e04393 | 698 | |
00203ba4 | 699 | sbitmap_del_wait_queue(wait); |
00e04393 OS |
700 | blk_mq_run_hw_queue(hctx, true); |
701 | return 1; | |
702 | } | |
703 | ||
704 | static int kyber_get_domain_token(struct kyber_queue_data *kqd, | |
705 | struct kyber_hctx_data *khd, | |
706 | struct blk_mq_hw_ctx *hctx) | |
707 | { | |
708 | unsigned int sched_domain = khd->cur_domain; | |
709 | struct sbitmap_queue *domain_tokens = &kqd->domain_tokens[sched_domain]; | |
00203ba4 | 710 | struct sbq_wait *wait = &khd->domain_wait[sched_domain]; |
00e04393 OS |
711 | struct sbq_wait_state *ws; |
712 | int nr; | |
713 | ||
714 | nr = __sbitmap_queue_get(domain_tokens); | |
00e04393 OS |
715 | |
716 | /* | |
717 | * If we failed to get a domain token, make sure the hardware queue is | |
718 | * run when one becomes available. Note that this is serialized on | |
719 | * khd->lock, but we still need to be careful about the waker. | |
720 | */ | |
00203ba4 | 721 | if (nr < 0 && list_empty_careful(&wait->wait.entry)) { |
00e04393 OS |
722 | ws = sbq_wait_ptr(domain_tokens, |
723 | &khd->wait_index[sched_domain]); | |
fcf38cdf | 724 | khd->domain_ws[sched_domain] = ws; |
00203ba4 | 725 | sbitmap_add_wait_queue(domain_tokens, ws, wait); |
00e04393 OS |
726 | |
727 | /* | |
728 | * Try again in case a token was freed before we got on the wait | |
fcf38cdf | 729 | * queue. |
00e04393 OS |
730 | */ |
731 | nr = __sbitmap_queue_get(domain_tokens); | |
fcf38cdf | 732 | } |
8cf46660 | 733 | |
fcf38cdf OS |
734 | /* |
735 | * If we got a token while we were on the wait queue, remove ourselves | |
736 | * from the wait queue to ensure that all wake ups make forward | |
737 | * progress. It's possible that the waker already deleted the entry | |
738 | * between the !list_empty_careful() check and us grabbing the lock, but | |
739 | * list_del_init() is okay with that. | |
740 | */ | |
00203ba4 | 741 | if (nr >= 0 && !list_empty_careful(&wait->wait.entry)) { |
fcf38cdf OS |
742 | ws = khd->domain_ws[sched_domain]; |
743 | spin_lock_irq(&ws->wait.lock); | |
00203ba4 | 744 | sbitmap_del_wait_queue(wait); |
fcf38cdf | 745 | spin_unlock_irq(&ws->wait.lock); |
00e04393 | 746 | } |
fcf38cdf | 747 | |
00e04393 OS |
748 | return nr; |
749 | } | |
750 | ||
751 | static struct request * | |
752 | kyber_dispatch_cur_domain(struct kyber_queue_data *kqd, | |
753 | struct kyber_hctx_data *khd, | |
a6088845 | 754 | struct blk_mq_hw_ctx *hctx) |
00e04393 OS |
755 | { |
756 | struct list_head *rqs; | |
757 | struct request *rq; | |
758 | int nr; | |
759 | ||
760 | rqs = &khd->rqs[khd->cur_domain]; | |
00e04393 OS |
761 | |
762 | /* | |
a6088845 JW |
763 | * If we already have a flushed request, then we just need to get a |
764 | * token for it. Otherwise, if there are pending requests in the kcqs, | |
765 | * flush the kcqs, but only if we can get a token. If not, we should | |
766 | * leave the requests in the kcqs so that they can be merged. Note that | |
767 | * khd->lock serializes the flushes, so if we observed any bit set in | |
768 | * the kcq_map, we will always get a request. | |
00e04393 | 769 | */ |
a6088845 | 770 | rq = list_first_entry_or_null(rqs, struct request, queuelist); |
00e04393 OS |
771 | if (rq) { |
772 | nr = kyber_get_domain_token(kqd, khd, hctx); | |
773 | if (nr >= 0) { | |
774 | khd->batching++; | |
775 | rq_set_domain_token(rq, nr); | |
776 | list_del_init(&rq->queuelist); | |
777 | return rq; | |
6c3b7af1 | 778 | } else { |
c4110804 | 779 | trace_kyber_throttled(kqd->dev, |
6c3b7af1 | 780 | kyber_domain_names[khd->cur_domain]); |
00e04393 | 781 | } |
a6088845 JW |
782 | } else if (sbitmap_any_bit_set(&khd->kcq_map[khd->cur_domain])) { |
783 | nr = kyber_get_domain_token(kqd, khd, hctx); | |
784 | if (nr >= 0) { | |
785 | kyber_flush_busy_kcqs(khd, khd->cur_domain, rqs); | |
786 | rq = list_first_entry(rqs, struct request, queuelist); | |
787 | khd->batching++; | |
788 | rq_set_domain_token(rq, nr); | |
789 | list_del_init(&rq->queuelist); | |
790 | return rq; | |
6c3b7af1 | 791 | } else { |
c4110804 | 792 | trace_kyber_throttled(kqd->dev, |
6c3b7af1 | 793 | kyber_domain_names[khd->cur_domain]); |
a6088845 | 794 | } |
00e04393 OS |
795 | } |
796 | ||
797 | /* There were either no pending requests or no tokens. */ | |
798 | return NULL; | |
799 | } | |
800 | ||
801 | static struct request *kyber_dispatch_request(struct blk_mq_hw_ctx *hctx) | |
802 | { | |
803 | struct kyber_queue_data *kqd = hctx->queue->elevator->elevator_data; | |
804 | struct kyber_hctx_data *khd = hctx->sched_data; | |
00e04393 OS |
805 | struct request *rq; |
806 | int i; | |
807 | ||
808 | spin_lock(&khd->lock); | |
809 | ||
810 | /* | |
811 | * First, if we are still entitled to batch, try to dispatch a request | |
812 | * from the batch. | |
813 | */ | |
814 | if (khd->batching < kyber_batch_size[khd->cur_domain]) { | |
a6088845 | 815 | rq = kyber_dispatch_cur_domain(kqd, khd, hctx); |
00e04393 OS |
816 | if (rq) |
817 | goto out; | |
818 | } | |
819 | ||
820 | /* | |
821 | * Either, | |
822 | * 1. We were no longer entitled to a batch. | |
823 | * 2. The domain we were batching didn't have any requests. | |
824 | * 3. The domain we were batching was out of tokens. | |
825 | * | |
826 | * Start another batch. Note that this wraps back around to the original | |
827 | * domain if no other domains have requests or tokens. | |
828 | */ | |
829 | khd->batching = 0; | |
830 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) { | |
831 | if (khd->cur_domain == KYBER_NUM_DOMAINS - 1) | |
832 | khd->cur_domain = 0; | |
833 | else | |
834 | khd->cur_domain++; | |
835 | ||
a6088845 | 836 | rq = kyber_dispatch_cur_domain(kqd, khd, hctx); |
00e04393 OS |
837 | if (rq) |
838 | goto out; | |
839 | } | |
840 | ||
841 | rq = NULL; | |
842 | out: | |
843 | spin_unlock(&khd->lock); | |
844 | return rq; | |
845 | } | |
846 | ||
847 | static bool kyber_has_work(struct blk_mq_hw_ctx *hctx) | |
848 | { | |
849 | struct kyber_hctx_data *khd = hctx->sched_data; | |
850 | int i; | |
851 | ||
852 | for (i = 0; i < KYBER_NUM_DOMAINS; i++) { | |
a6088845 JW |
853 | if (!list_empty_careful(&khd->rqs[i]) || |
854 | sbitmap_any_bit_set(&khd->kcq_map[i])) | |
00e04393 OS |
855 | return true; |
856 | } | |
a6088845 JW |
857 | |
858 | return false; | |
00e04393 OS |
859 | } |
860 | ||
6e25cb01 OS |
861 | #define KYBER_LAT_SHOW_STORE(domain, name) \ |
862 | static ssize_t kyber_##name##_lat_show(struct elevator_queue *e, \ | |
863 | char *page) \ | |
00e04393 OS |
864 | { \ |
865 | struct kyber_queue_data *kqd = e->elevator_data; \ | |
866 | \ | |
6e25cb01 | 867 | return sprintf(page, "%llu\n", kqd->latency_targets[domain]); \ |
00e04393 OS |
868 | } \ |
869 | \ | |
6e25cb01 OS |
870 | static ssize_t kyber_##name##_lat_store(struct elevator_queue *e, \ |
871 | const char *page, size_t count) \ | |
00e04393 OS |
872 | { \ |
873 | struct kyber_queue_data *kqd = e->elevator_data; \ | |
874 | unsigned long long nsec; \ | |
875 | int ret; \ | |
876 | \ | |
877 | ret = kstrtoull(page, 10, &nsec); \ | |
878 | if (ret) \ | |
879 | return ret; \ | |
880 | \ | |
6e25cb01 | 881 | kqd->latency_targets[domain] = nsec; \ |
00e04393 OS |
882 | \ |
883 | return count; \ | |
884 | } | |
6e25cb01 OS |
885 | KYBER_LAT_SHOW_STORE(KYBER_READ, read); |
886 | KYBER_LAT_SHOW_STORE(KYBER_WRITE, write); | |
00e04393 OS |
887 | #undef KYBER_LAT_SHOW_STORE |
888 | ||
889 | #define KYBER_LAT_ATTR(op) __ATTR(op##_lat_nsec, 0644, kyber_##op##_lat_show, kyber_##op##_lat_store) | |
890 | static struct elv_fs_entry kyber_sched_attrs[] = { | |
891 | KYBER_LAT_ATTR(read), | |
892 | KYBER_LAT_ATTR(write), | |
893 | __ATTR_NULL | |
894 | }; | |
895 | #undef KYBER_LAT_ATTR | |
896 | ||
16b738f6 OS |
897 | #ifdef CONFIG_BLK_DEBUG_FS |
898 | #define KYBER_DEBUGFS_DOMAIN_ATTRS(domain, name) \ | |
899 | static int kyber_##name##_tokens_show(void *data, struct seq_file *m) \ | |
900 | { \ | |
901 | struct request_queue *q = data; \ | |
902 | struct kyber_queue_data *kqd = q->elevator->elevator_data; \ | |
903 | \ | |
904 | sbitmap_queue_show(&kqd->domain_tokens[domain], m); \ | |
905 | return 0; \ | |
906 | } \ | |
907 | \ | |
908 | static void *kyber_##name##_rqs_start(struct seq_file *m, loff_t *pos) \ | |
909 | __acquires(&khd->lock) \ | |
910 | { \ | |
911 | struct blk_mq_hw_ctx *hctx = m->private; \ | |
912 | struct kyber_hctx_data *khd = hctx->sched_data; \ | |
913 | \ | |
914 | spin_lock(&khd->lock); \ | |
915 | return seq_list_start(&khd->rqs[domain], *pos); \ | |
916 | } \ | |
917 | \ | |
918 | static void *kyber_##name##_rqs_next(struct seq_file *m, void *v, \ | |
919 | loff_t *pos) \ | |
920 | { \ | |
921 | struct blk_mq_hw_ctx *hctx = m->private; \ | |
922 | struct kyber_hctx_data *khd = hctx->sched_data; \ | |
923 | \ | |
924 | return seq_list_next(v, &khd->rqs[domain], pos); \ | |
925 | } \ | |
926 | \ | |
927 | static void kyber_##name##_rqs_stop(struct seq_file *m, void *v) \ | |
928 | __releases(&khd->lock) \ | |
929 | { \ | |
930 | struct blk_mq_hw_ctx *hctx = m->private; \ | |
931 | struct kyber_hctx_data *khd = hctx->sched_data; \ | |
932 | \ | |
933 | spin_unlock(&khd->lock); \ | |
934 | } \ | |
935 | \ | |
936 | static const struct seq_operations kyber_##name##_rqs_seq_ops = { \ | |
937 | .start = kyber_##name##_rqs_start, \ | |
938 | .next = kyber_##name##_rqs_next, \ | |
939 | .stop = kyber_##name##_rqs_stop, \ | |
940 | .show = blk_mq_debugfs_rq_show, \ | |
941 | }; \ | |
942 | \ | |
943 | static int kyber_##name##_waiting_show(void *data, struct seq_file *m) \ | |
944 | { \ | |
945 | struct blk_mq_hw_ctx *hctx = data; \ | |
946 | struct kyber_hctx_data *khd = hctx->sched_data; \ | |
00203ba4 | 947 | wait_queue_entry_t *wait = &khd->domain_wait[domain].wait; \ |
16b738f6 | 948 | \ |
2055da97 | 949 | seq_printf(m, "%d\n", !list_empty_careful(&wait->entry)); \ |
16b738f6 OS |
950 | return 0; \ |
951 | } | |
952 | KYBER_DEBUGFS_DOMAIN_ATTRS(KYBER_READ, read) | |
6e25cb01 OS |
953 | KYBER_DEBUGFS_DOMAIN_ATTRS(KYBER_WRITE, write) |
954 | KYBER_DEBUGFS_DOMAIN_ATTRS(KYBER_DISCARD, discard) | |
16b738f6 OS |
955 | KYBER_DEBUGFS_DOMAIN_ATTRS(KYBER_OTHER, other) |
956 | #undef KYBER_DEBUGFS_DOMAIN_ATTRS | |
957 | ||
958 | static int kyber_async_depth_show(void *data, struct seq_file *m) | |
959 | { | |
960 | struct request_queue *q = data; | |
961 | struct kyber_queue_data *kqd = q->elevator->elevator_data; | |
962 | ||
963 | seq_printf(m, "%u\n", kqd->async_depth); | |
964 | return 0; | |
965 | } | |
966 | ||
967 | static int kyber_cur_domain_show(void *data, struct seq_file *m) | |
968 | { | |
969 | struct blk_mq_hw_ctx *hctx = data; | |
970 | struct kyber_hctx_data *khd = hctx->sched_data; | |
971 | ||
6c3b7af1 | 972 | seq_printf(m, "%s\n", kyber_domain_names[khd->cur_domain]); |
16b738f6 OS |
973 | return 0; |
974 | } | |
975 | ||
976 | static int kyber_batching_show(void *data, struct seq_file *m) | |
977 | { | |
978 | struct blk_mq_hw_ctx *hctx = data; | |
979 | struct kyber_hctx_data *khd = hctx->sched_data; | |
980 | ||
981 | seq_printf(m, "%u\n", khd->batching); | |
982 | return 0; | |
983 | } | |
984 | ||
985 | #define KYBER_QUEUE_DOMAIN_ATTRS(name) \ | |
986 | {#name "_tokens", 0400, kyber_##name##_tokens_show} | |
987 | static const struct blk_mq_debugfs_attr kyber_queue_debugfs_attrs[] = { | |
988 | KYBER_QUEUE_DOMAIN_ATTRS(read), | |
6e25cb01 OS |
989 | KYBER_QUEUE_DOMAIN_ATTRS(write), |
990 | KYBER_QUEUE_DOMAIN_ATTRS(discard), | |
16b738f6 OS |
991 | KYBER_QUEUE_DOMAIN_ATTRS(other), |
992 | {"async_depth", 0400, kyber_async_depth_show}, | |
993 | {}, | |
994 | }; | |
995 | #undef KYBER_QUEUE_DOMAIN_ATTRS | |
996 | ||
997 | #define KYBER_HCTX_DOMAIN_ATTRS(name) \ | |
998 | {#name "_rqs", 0400, .seq_ops = &kyber_##name##_rqs_seq_ops}, \ | |
999 | {#name "_waiting", 0400, kyber_##name##_waiting_show} | |
1000 | static const struct blk_mq_debugfs_attr kyber_hctx_debugfs_attrs[] = { | |
1001 | KYBER_HCTX_DOMAIN_ATTRS(read), | |
6e25cb01 OS |
1002 | KYBER_HCTX_DOMAIN_ATTRS(write), |
1003 | KYBER_HCTX_DOMAIN_ATTRS(discard), | |
16b738f6 OS |
1004 | KYBER_HCTX_DOMAIN_ATTRS(other), |
1005 | {"cur_domain", 0400, kyber_cur_domain_show}, | |
1006 | {"batching", 0400, kyber_batching_show}, | |
1007 | {}, | |
1008 | }; | |
1009 | #undef KYBER_HCTX_DOMAIN_ATTRS | |
1010 | #endif | |
1011 | ||
00e04393 | 1012 | static struct elevator_type kyber_sched = { |
f9cd4bfe | 1013 | .ops = { |
00e04393 OS |
1014 | .init_sched = kyber_init_sched, |
1015 | .exit_sched = kyber_exit_sched, | |
1016 | .init_hctx = kyber_init_hctx, | |
1017 | .exit_hctx = kyber_exit_hctx, | |
5bbf4e5a | 1018 | .limit_depth = kyber_limit_depth, |
a6088845 | 1019 | .bio_merge = kyber_bio_merge, |
5bbf4e5a | 1020 | .prepare_request = kyber_prepare_request, |
a6088845 | 1021 | .insert_requests = kyber_insert_requests, |
7b9e9361 | 1022 | .finish_request = kyber_finish_request, |
ba989a01 | 1023 | .requeue_request = kyber_finish_request, |
00e04393 OS |
1024 | .completed_request = kyber_completed_request, |
1025 | .dispatch_request = kyber_dispatch_request, | |
1026 | .has_work = kyber_has_work, | |
ffa772cf | 1027 | .depth_updated = kyber_depth_updated, |
00e04393 | 1028 | }, |
16b738f6 OS |
1029 | #ifdef CONFIG_BLK_DEBUG_FS |
1030 | .queue_debugfs_attrs = kyber_queue_debugfs_attrs, | |
1031 | .hctx_debugfs_attrs = kyber_hctx_debugfs_attrs, | |
1032 | #endif | |
00e04393 OS |
1033 | .elevator_attrs = kyber_sched_attrs, |
1034 | .elevator_name = "kyber", | |
b6e68ee8 | 1035 | .elevator_features = ELEVATOR_F_MQ_AWARE, |
00e04393 OS |
1036 | .elevator_owner = THIS_MODULE, |
1037 | }; | |
1038 | ||
1039 | static int __init kyber_init(void) | |
1040 | { | |
1041 | return elv_register(&kyber_sched); | |
1042 | } | |
1043 | ||
1044 | static void __exit kyber_exit(void) | |
1045 | { | |
1046 | elv_unregister(&kyber_sched); | |
1047 | } | |
1048 | ||
1049 | module_init(kyber_init); | |
1050 | module_exit(kyber_exit); | |
1051 | ||
1052 | MODULE_AUTHOR("Omar Sandoval"); | |
1053 | MODULE_LICENSE("GPL"); | |
1054 | MODULE_DESCRIPTION("Kyber I/O scheduler"); |