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Linux/block/blk-mq-sysfs.c

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  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 
 16 static void blk_mq_sysfs_release(struct kobject *kobj)
 17 {
 18 }
 19 
 20 static void blk_mq_hw_sysfs_release(struct kobject *kobj)
 21 {
 22         struct blk_mq_hw_ctx *hctx = container_of(kobj, struct blk_mq_hw_ctx,
 23                                                   kobj);
 24         free_cpumask_var(hctx->cpumask);
 25         kfree(hctx->ctxs);
 26         kfree(hctx);
 27 }
 28 
 29 struct blk_mq_ctx_sysfs_entry {
 30         struct attribute attr;
 31         ssize_t (*show)(struct blk_mq_ctx *, char *);
 32         ssize_t (*store)(struct blk_mq_ctx *, const char *, size_t);
 33 };
 34 
 35 struct blk_mq_hw_ctx_sysfs_entry {
 36         struct attribute attr;
 37         ssize_t (*show)(struct blk_mq_hw_ctx *, char *);
 38         ssize_t (*store)(struct blk_mq_hw_ctx *, const char *, size_t);
 39 };
 40 
 41 static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
 42                                  char *page)
 43 {
 44         struct blk_mq_ctx_sysfs_entry *entry;
 45         struct blk_mq_ctx *ctx;
 46         struct request_queue *q;
 47         ssize_t res;
 48 
 49         entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
 50         ctx = container_of(kobj, struct blk_mq_ctx, kobj);
 51         q = ctx->queue;
 52 
 53         if (!entry->show)
 54                 return -EIO;
 55 
 56         res = -ENOENT;
 57         mutex_lock(&q->sysfs_lock);
 58         if (!blk_queue_dying(q))
 59                 res = entry->show(ctx, page);
 60         mutex_unlock(&q->sysfs_lock);
 61         return res;
 62 }
 63 
 64 static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
 65                                   const char *page, size_t length)
 66 {
 67         struct blk_mq_ctx_sysfs_entry *entry;
 68         struct blk_mq_ctx *ctx;
 69         struct request_queue *q;
 70         ssize_t res;
 71 
 72         entry = container_of(attr, struct blk_mq_ctx_sysfs_entry, attr);
 73         ctx = container_of(kobj, struct blk_mq_ctx, kobj);
 74         q = ctx->queue;
 75 
 76         if (!entry->store)
 77                 return -EIO;
 78 
 79         res = -ENOENT;
 80         mutex_lock(&q->sysfs_lock);
 81         if (!blk_queue_dying(q))
 82                 res = entry->store(ctx, page, length);
 83         mutex_unlock(&q->sysfs_lock);
 84         return res;
 85 }
 86 
 87 static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
 88                                     struct attribute *attr, char *page)
 89 {
 90         struct blk_mq_hw_ctx_sysfs_entry *entry;
 91         struct blk_mq_hw_ctx *hctx;
 92         struct request_queue *q;
 93         ssize_t res;
 94 
 95         entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
 96         hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
 97         q = hctx->queue;
 98 
 99         if (!entry->show)
100                 return -EIO;
101 
102         res = -ENOENT;
103         mutex_lock(&q->sysfs_lock);
104         if (!blk_queue_dying(q))
105                 res = entry->show(hctx, page);
106         mutex_unlock(&q->sysfs_lock);
107         return res;
108 }
109 
110 static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
111                                      struct attribute *attr, const char *page,
112                                      size_t length)
113 {
114         struct blk_mq_hw_ctx_sysfs_entry *entry;
115         struct blk_mq_hw_ctx *hctx;
116         struct request_queue *q;
117         ssize_t res;
118 
119         entry = container_of(attr, struct blk_mq_hw_ctx_sysfs_entry, attr);
120         hctx = container_of(kobj, struct blk_mq_hw_ctx, kobj);
121         q = hctx->queue;
122 
123         if (!entry->store)
124                 return -EIO;
125 
126         res = -ENOENT;
127         mutex_lock(&q->sysfs_lock);
128         if (!blk_queue_dying(q))
129                 res = entry->store(hctx, page, length);
130         mutex_unlock(&q->sysfs_lock);
131         return res;
132 }
133 
134 static ssize_t blk_mq_hw_sysfs_nr_tags_show(struct blk_mq_hw_ctx *hctx,
135                                             char *page)
136 {
137         return sprintf(page, "%u\n", hctx->tags->nr_tags);
138 }
139 
140 static ssize_t blk_mq_hw_sysfs_nr_reserved_tags_show(struct blk_mq_hw_ctx *hctx,
141                                                      char *page)
142 {
143         return sprintf(page, "%u\n", hctx->tags->nr_reserved_tags);
144 }
145 
146 static ssize_t blk_mq_hw_sysfs_cpus_show(struct blk_mq_hw_ctx *hctx, char *page)
147 {
148         unsigned int i, first = 1;
149         ssize_t ret = 0;
150 
151         for_each_cpu(i, hctx->cpumask) {
152                 if (first)
153                         ret += sprintf(ret + page, "%u", i);
154                 else
155                         ret += sprintf(ret + page, ", %u", i);
156 
157                 first = 0;
158         }
159 
160         ret += sprintf(ret + page, "\n");
161         return ret;
162 }
163 
164 static struct attribute *default_ctx_attrs[] = {
165         NULL,
166 };
167 
168 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
169         .attr = {.name = "nr_tags", .mode = S_IRUGO },
170         .show = blk_mq_hw_sysfs_nr_tags_show,
171 };
172 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_reserved_tags = {
173         .attr = {.name = "nr_reserved_tags", .mode = S_IRUGO },
174         .show = blk_mq_hw_sysfs_nr_reserved_tags_show,
175 };
176 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
177         .attr = {.name = "cpu_list", .mode = S_IRUGO },
178         .show = blk_mq_hw_sysfs_cpus_show,
179 };
180 
181 static struct attribute *default_hw_ctx_attrs[] = {
182         &blk_mq_hw_sysfs_nr_tags.attr,
183         &blk_mq_hw_sysfs_nr_reserved_tags.attr,
184         &blk_mq_hw_sysfs_cpus.attr,
185         NULL,
186 };
187 
188 static const struct sysfs_ops blk_mq_sysfs_ops = {
189         .show   = blk_mq_sysfs_show,
190         .store  = blk_mq_sysfs_store,
191 };
192 
193 static const struct sysfs_ops blk_mq_hw_sysfs_ops = {
194         .show   = blk_mq_hw_sysfs_show,
195         .store  = blk_mq_hw_sysfs_store,
196 };
197 
198 static struct kobj_type blk_mq_ktype = {
199         .sysfs_ops      = &blk_mq_sysfs_ops,
200         .release        = blk_mq_sysfs_release,
201 };
202 
203 static struct kobj_type blk_mq_ctx_ktype = {
204         .sysfs_ops      = &blk_mq_sysfs_ops,
205         .default_attrs  = default_ctx_attrs,
206         .release        = blk_mq_sysfs_release,
207 };
208 
209 static struct kobj_type blk_mq_hw_ktype = {
210         .sysfs_ops      = &blk_mq_hw_sysfs_ops,
211         .default_attrs  = default_hw_ctx_attrs,
212         .release        = blk_mq_hw_sysfs_release,
213 };
214 
215 static void blk_mq_unregister_hctx(struct blk_mq_hw_ctx *hctx)
216 {
217         struct blk_mq_ctx *ctx;
218         int i;
219 
220         if (!hctx->nr_ctx)
221                 return;
222 
223         hctx_for_each_ctx(hctx, ctx, i)
224                 kobject_del(&ctx->kobj);
225 
226         kobject_del(&hctx->kobj);
227 }
228 
229 static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
230 {
231         struct request_queue *q = hctx->queue;
232         struct blk_mq_ctx *ctx;
233         int i, ret;
234 
235         if (!hctx->nr_ctx)
236                 return 0;
237 
238         ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
239         if (ret)
240                 return ret;
241 
242         hctx_for_each_ctx(hctx, ctx, i) {
243                 ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
244                 if (ret)
245                         break;
246         }
247 
248         return ret;
249 }
250 
251 static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
252 {
253         struct blk_mq_hw_ctx *hctx;
254         int i;
255 
256         lockdep_assert_held(&q->sysfs_lock);
257 
258         queue_for_each_hw_ctx(q, hctx, i)
259                 blk_mq_unregister_hctx(hctx);
260 
261         kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
262         kobject_del(&q->mq_kobj);
263         kobject_put(&dev->kobj);
264 
265         q->mq_sysfs_init_done = false;
266 }
267 
268 void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
269 {
270         mutex_lock(&q->sysfs_lock);
271         __blk_mq_unregister_dev(dev, q);
272         mutex_unlock(&q->sysfs_lock);
273 }
274 
275 void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx)
276 {
277         kobject_init(&hctx->kobj, &blk_mq_hw_ktype);
278 }
279 
280 void blk_mq_sysfs_deinit(struct request_queue *q)
281 {
282         struct blk_mq_ctx *ctx;
283         int cpu;
284 
285         for_each_possible_cpu(cpu) {
286                 ctx = per_cpu_ptr(q->queue_ctx, cpu);
287                 kobject_put(&ctx->kobj);
288         }
289         kobject_put(&q->mq_kobj);
290 }
291 
292 void blk_mq_sysfs_init(struct request_queue *q)
293 {
294         struct blk_mq_ctx *ctx;
295         int cpu;
296 
297         kobject_init(&q->mq_kobj, &blk_mq_ktype);
298 
299         for_each_possible_cpu(cpu) {
300                 ctx = per_cpu_ptr(q->queue_ctx, cpu);
301                 kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
302         }
303 }
304 
305 int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
306 {
307         struct blk_mq_hw_ctx *hctx;
308         int ret, i;
309 
310         WARN_ON_ONCE(!q->kobj.parent);
311         lockdep_assert_held(&q->sysfs_lock);
312 
313         ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
314         if (ret < 0)
315                 goto out;
316 
317         kobject_uevent(&q->mq_kobj, KOBJ_ADD);
318 
319         queue_for_each_hw_ctx(q, hctx, i) {
320                 ret = blk_mq_register_hctx(hctx);
321                 if (ret)
322                         goto unreg;
323         }
324 
325         q->mq_sysfs_init_done = true;
326 
327 out:
328         return ret;
329 
330 unreg:
331         while (--i >= 0)
332                 blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
333 
334         kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
335         kobject_del(&q->mq_kobj);
336         kobject_put(&dev->kobj);
337         return ret;
338 }
339 
340 int blk_mq_register_dev(struct device *dev, struct request_queue *q)
341 {
342         int ret;
343 
344         mutex_lock(&q->sysfs_lock);
345         ret = __blk_mq_register_dev(dev, q);
346         mutex_unlock(&q->sysfs_lock);
347 
348         return ret;
349 }
350 EXPORT_SYMBOL_GPL(blk_mq_register_dev);
351 
352 void blk_mq_sysfs_unregister(struct request_queue *q)
353 {
354         struct blk_mq_hw_ctx *hctx;
355         int i;
356 
357         mutex_lock(&q->sysfs_lock);
358         if (!q->mq_sysfs_init_done)
359                 goto unlock;
360 
361         queue_for_each_hw_ctx(q, hctx, i)
362                 blk_mq_unregister_hctx(hctx);
363 
364 unlock:
365         mutex_unlock(&q->sysfs_lock);
366 }
367 
368 int blk_mq_sysfs_register(struct request_queue *q)
369 {
370         struct blk_mq_hw_ctx *hctx;
371         int i, ret = 0;
372 
373         mutex_lock(&q->sysfs_lock);
374         if (!q->mq_sysfs_init_done)
375                 goto unlock;
376 
377         queue_for_each_hw_ctx(q, hctx, i) {
378                 ret = blk_mq_register_hctx(hctx);
379                 if (ret)
380                         break;
381         }
382 
383 unlock:
384         mutex_unlock(&q->sysfs_lock);
385 
386         return ret;
387 }
388 

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