1#include <linux/kernel.h> 2#include <linux/module.h> 3#include <linux/backing-dev.h> 4#include <linux/bio.h> 5#include <linux/blkdev.h> 6#include <linux/mm.h> 7#include <linux/init.h> 8#include <linux/slab.h> 9#include <linux/workqueue.h> 10#include <linux/smp.h> 11 12#include <linux/blk-mq.h> 13#include "blk-mq.h" 14#include "blk-mq-tag.h" 15 16static void blk_mq_sysfs_release(struct kobject *kobj) 17{ 18} 19 20struct blk_mq_ctx_sysfs_entry { 21 struct attribute attr; 22 ssize_t (*show)(struct blk_mq_ctx *, char *); 23 ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t); 24}; 25 26struct blk_mq_hw_ctx_sysfs_entry { 27 struct attribute attr; 28 ssize_t (*show)(struct blk_mq_hw_ctx *, char *); 29 ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t); 30}; 31 32static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr, 33 char *page) 34{ 35 struct blk_mq_ctx_sysfs_entry *entry; 36 struct blk_mq_ctx *ctx; 37 struct request_queue *q; 38 ssize_t res; 39 40 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); 41 ctx = container_of(kobj, struct blk_mq_ctx, kobj); 42 q = ctx->queue; 43 44 if (!entry->show) 45 return -EIO; 46 47 res = -ENOENT; 48 mutex_lock(&q->sysfs_lock); 49 if (!blk_queue_dying(q)) 50 res = entry->show(ctx, page); 51 mutex_unlock(&q->sysfs_lock); 52 return res; 53} 54 55static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr, 56 const char *page, size_t length) 57{ 58 struct blk_mq_ctx_sysfs_entry *entry; 59 struct blk_mq_ctx *ctx; 60 struct request_queue *q; 61 ssize_t res; 62 63 entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr); 64 ctx = container_of(kobj, struct blk_mq_ctx, kobj); 65 q = ctx->queue; 66 67 if (!entry->store) 68 return -EIO; 69 70 res = -ENOENT; 71 mutex_lock(&q->sysfs_lock); 72 if (!blk_queue_dying(q)) 73 res = entry->store(ctx, page, length); 74 mutex_unlock(&q->sysfs_lock); 75 return res; 76} 77 78static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj, 79 struct attribute *attr, char *page) 80{ 81 struct blk_mq_hw_ctx_sysfs_entry *entry; 82 struct blk_mq_hw_ctx *hctx; 83 struct request_queue *q; 84 ssize_t res; 85 86 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); 87 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); 88 q = hctx->queue; 89 90 if (!entry->show) 91 return -EIO; 92 93 res = -ENOENT; 94 mutex_lock(&q->sysfs_lock); 95 if (!blk_queue_dying(q)) 96 res = entry->show(hctx, page); 97 mutex_unlock(&q->sysfs_lock); 98 return res; 99} 100 101static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj, 102 struct attribute *attr, const char *page, 103 size_t length) 104{ 105 struct blk_mq_hw_ctx_sysfs_entry *entry; 106 struct blk_mq_hw_ctx *hctx; 107 struct request_queue *q; 108 ssize_t res; 109 110 entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr); 111 hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj); 112 q = hctx->queue; 113 114 if (!entry->store) 115 return -EIO; 116 117 res = -ENOENT; 118 mutex_lock(&q->sysfs_lock); 119 if (!blk_queue_dying(q)) 120 res = entry->store(hctx, page, length); 121 mutex_unlock(&q->sysfs_lock); 122 return res; 123} 124 125static ssize_t blk_mq_sysfs_dispatched_show(struct blk_mq_ctx *ctx, char *page) 126{ 127 return sprintf(page, "%lu %lu\n", ctx->rq_dispatched[1], 128 ctx->rq_dispatched[0]); 129} 130 131static ssize_t blk_mq_sysfs_merged_show(struct blk_mq_ctx *ctx, char *page) 132{ 133 return sprintf(page, "%lu\n", ctx->rq_merged); 134} 135 136static ssize_t blk_mq_sysfs_completed_show(struct blk_mq_ctx *ctx, char *page) 137{ 138 return sprintf(page, "%lu %lu\n", ctx->rq_completed[1], 139 ctx->rq_completed[0]); 140} 141 142static ssize_t sysfs_list_show(char *page, struct list_head *list, char *msg) 143{ 144 char *start_page = page; 145 struct request *rq; 146 147 page += sprintf(page, "%s:\n", msg); 148 149 list_for_each_entry(rq, list, queuelist) 150 page += sprintf(page, "\t%p\n", rq); 151 152 return page - start_page; 153} 154 155static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page) 156{ 157 ssize_t ret; 158 159 spin_lock(&ctx->lock); 160 ret = sysfs_list_show(page, &ctx->rq_list, "CTX pending"); 161 spin_unlock(&ctx->lock); 162 163 return ret; 164} 165 166static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx, 167 char *page) 168{ 169 return sprintf(page, "%lu\n", hctx->queued); 170} 171 172static ssize_t blk_mq_hw_sysfs_run_show(struct blk_mq_hw_ctx *hctx, char *page) 173{ 174 return sprintf(page, "%lu\n", hctx->run); 175} 176 177static ssize_t blk_mq_hw_sysfs_dispatched_show(struct blk_mq_hw_ctx *hctx, 178 char *page) 179{ 180 char *start_page = page; 181 int i; 182 183 page += sprintf(page, "%8u\t%lu\n", 0U, hctx->dispatched[0]); 184 185 for (i = 1; i < BLK_MQ_MAX_DISPATCH_ORDER; i++) { 186 unsigned long d = 1U << (i - 1); 187 188 page += sprintf(page, "%8lu\t%lu\n", d, hctx->dispatched[i]); 189 } 190 191 return page - start_page; 192} 193 194static ssize_t blk_mq_hw_sysfs_rq_list_show(struct blk_mq_hw_ctx *hctx, 195 char *page) 196{ 197 ssize_t ret; 198 199 spin_lock(&hctx->lock); 200 ret = sysfs_list_show(page, &hctx->dispatch, "HCTX pending"); 201 spin_unlock(&hctx->lock); 202 203 return ret; 204} 205 206static ssize_t blk_mq_hw_sysfs_ipi_show(struct blk_mq_hw_ctx *hctx, char *page) 207{ 208 ssize_t ret; 209 210 spin_lock(&hctx->lock); 211 ret = sprintf(page, "%u\n", !!(hctx->flags & BLK_MQ_F_SHOULD_IPI)); 212 spin_unlock(&hctx->lock); 213 214 return ret; 215} 216 217static ssize_t blk_mq_hw_sysfs_ipi_store(struct blk_mq_hw_ctx *hctx, 218 const char *page, size_t len) 219{ 220 struct blk_mq_ctx *ctx; 221 unsigned long ret; 222 unsigned int i; 223 224 if (kstrtoul(page, 10, &ret)) { 225 pr_err("blk-mq-sysfs: invalid input '%s'\n", page); 226 return -EINVAL; 227 } 228 229 spin_lock(&hctx->lock); 230 if (ret) 231 hctx->flags |= BLK_MQ_F_SHOULD_IPI; 232 else 233 hctx->flags &= ~BLK_MQ_F_SHOULD_IPI; 234 spin_unlock(&hctx->lock); 235 236 hctx_for_each_ctx(hctx, ctx, i) 237 ctx->ipi_redirect = !!ret; 238 239 return len; 240} 241 242static ssize_t blk_mq_hw_sysfs_tags_show(struct blk_mq_hw_ctx *hctx, char *page) 243{ 244 return blk_mq_tag_sysfs_show(hctx->tags, page); 245} 246 247static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_dispatched = { 248 .attr = {.name = "dispatched", .mode = S_IRUGO }, 249 .show = blk_mq_sysfs_dispatched_show, 250}; 251static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_merged = { 252 .attr = {.name = "merged", .mode = S_IRUGO }, 253 .show = blk_mq_sysfs_merged_show, 254}; 255static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_completed = { 256 .attr = {.name = "completed", .mode = S_IRUGO }, 257 .show = blk_mq_sysfs_completed_show, 258}; 259static struct blk_mq_ctx_sysfs_entry blk_mq_sysfs_rq_list = { 260 .attr = {.name = "rq_list", .mode = S_IRUGO }, 261 .show = blk_mq_sysfs_rq_list_show, 262}; 263 264static struct attribute *default_ctx_attrs[] = { 265 &blk_mq_sysfs_dispatched.attr, 266 &blk_mq_sysfs_merged.attr, 267 &blk_mq_sysfs_completed.attr, 268 &blk_mq_sysfs_rq_list.attr, 269 NULL, 270}; 271 272static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_queued = { 273 .attr = {.name = "queued", .mode = S_IRUGO }, 274 .show = blk_mq_hw_sysfs_queued_show, 275}; 276static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_run = { 277 .attr = {.name = "run", .mode = S_IRUGO }, 278 .show = blk_mq_hw_sysfs_run_show, 279}; 280static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_dispatched = { 281 .attr = {.name = "dispatched", .mode = S_IRUGO }, 282 .show = blk_mq_hw_sysfs_dispatched_show, 283}; 284static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_pending = { 285 .attr = {.name = "pending", .mode = S_IRUGO }, 286 .show = blk_mq_hw_sysfs_rq_list_show, 287}; 288static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_ipi = { 289 .attr = {.name = "ipi_redirect", .mode = S_IRUGO | S_IWUSR}, 290 .show = blk_mq_hw_sysfs_ipi_show, 291 .store = blk_mq_hw_sysfs_ipi_store, 292}; 293static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_tags = { 294 .attr = {.name = "tags", .mode = S_IRUGO }, 295 .show = blk_mq_hw_sysfs_tags_show, 296}; 297 298static struct attribute *default_hw_ctx_attrs[] = { 299 &blk_mq_hw_sysfs_queued.attr, 300 &blk_mq_hw_sysfs_run.attr, 301 &blk_mq_hw_sysfs_dispatched.attr, 302 &blk_mq_hw_sysfs_pending.attr, 303 &blk_mq_hw_sysfs_ipi.attr, 304 &blk_mq_hw_sysfs_tags.attr, 305 NULL, 306}; 307 308static const struct sysfs_ops blk_mq_sysfs_ops = { 309 .show = blk_mq_sysfs_show, 310 .store = blk_mq_sysfs_store, 311}; 312 313static const struct sysfs_ops blk_mq_hw_sysfs_ops = { 314 .show = blk_mq_hw_sysfs_show, 315 .store = blk_mq_hw_sysfs_store, 316}; 317 318static struct kobj_type blk_mq_ktype = { 319 .sysfs_ops = &blk_mq_sysfs_ops, 320 .release = blk_mq_sysfs_release, 321}; 322 323static struct kobj_type blk_mq_ctx_ktype = { 324 .sysfs_ops = &blk_mq_sysfs_ops, 325 .default_attrs = default_ctx_attrs, 326 .release = blk_mq_sysfs_release, 327}; 328 329static struct kobj_type blk_mq_hw_ktype = { 330 .sysfs_ops = &blk_mq_hw_sysfs_ops, 331 .default_attrs = default_hw_ctx_attrs, 332 .release = blk_mq_sysfs_release, 333}; 334 335void blk_mq_unregister_disk(struct gendisk *disk) 336{ 337 struct request_queue *q = disk->queue; 338 struct blk_mq_hw_ctx *hctx; 339 struct blk_mq_ctx *ctx; 340 int i, j; 341 342 queue_for_each_hw_ctx(q, hctx, i) { 343 hctx_for_each_ctx(hctx, ctx, j) { 344 kobject_del(&ctx->kobj); 345 kobject_put(&ctx->kobj); 346 } 347 kobject_del(&hctx->kobj); 348 kobject_put(&hctx->kobj); 349 } 350 351 kobject_uevent(&q->mq_kobj, KOBJ_REMOVE); 352 kobject_del(&q->mq_kobj); 353 kobject_put(&q->mq_kobj); 354 355 kobject_put(&disk_to_dev(disk)->kobj); 356} 357 358int blk_mq_register_disk(struct gendisk *disk) 359{ 360 struct device *dev = disk_to_dev(disk); 361 struct request_queue *q = disk->queue; 362 struct blk_mq_hw_ctx *hctx; 363 struct blk_mq_ctx *ctx; 364 int ret, i, j; 365 366 kobject_init(&q->mq_kobj, &blk_mq_ktype); 367 368 ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq"); 369 if (ret < 0) 370 return ret; 371 372 kobject_uevent(&q->mq_kobj, KOBJ_ADD); 373 374 queue_for_each_hw_ctx(q, hctx, i) { 375 kobject_init(&hctx->kobj, &blk_mq_hw_ktype); 376 ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", i); 377 if (ret) 378 break; 379 380 if (!hctx->nr_ctx) 381 continue; 382 383 hctx_for_each_ctx(hctx, ctx, j) { 384 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype); 385 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu); 386 if (ret) 387 break; 388 } 389 } 390 391 if (ret) { 392 blk_mq_unregister_disk(disk); 393 return ret; 394 } 395 396 return 0; 397} 398