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