修改GPIO导出默认初始值

hc

2024-10-16 50a212ec906f7524620675f0c57357691c26c81f

 kernel/block/blk-mq-sysfs.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0
1
2
 #include <linux/kernel.h>
2
3
 #include <linux/module.h>
3
4
 #include <linux/backing-dev.h>
..
..
@@ -16,6 +17,18 @@
16
17
 
17
18
 static void blk_mq_sysfs_release(struct kobject *kobj)
18
19
 {
20
+	struct blk_mq_ctxs *ctxs = container_of(kobj, struct blk_mq_ctxs, kobj);
21
+
22
+	free_percpu(ctxs->queue_ctx);
23
+	kfree(ctxs);
24
+}
25
+
26
+static void blk_mq_ctx_sysfs_release(struct kobject *kobj)
27
+{
28
+	struct blk_mq_ctx *ctx = container_of(kobj, struct blk_mq_ctx, kobj);
29
+
30
+	/* ctx->ctxs won't be released until all ctx are freed */
31
+	kobject_put(&ctx->ctxs->kobj);
19
32
 }
20
33
 
21
34
 static void blk_mq_hw_sysfs_release(struct kobject *kobj)
..
..
@@ -59,10 +72,8 @@
59
72
 	if (!entry->show)
60
73
 		return -EIO;
61
74
 
62
-	res = -ENOENT;
63
75
 	mutex_lock(&q->sysfs_lock);
64
-	if (!blk_queue_dying(q))
65
-		res = entry->show(ctx, page);
76
+	res = entry->show(ctx, page);
66
77
 	mutex_unlock(&q->sysfs_lock);
67
78
 	return res;
68
79
 }
..
..
@@ -82,10 +93,8 @@
82
93
 	if (!entry->store)
83
94
 		return -EIO;
84
95
 
85
-	res = -ENOENT;
86
96
 	mutex_lock(&q->sysfs_lock);
87
-	if (!blk_queue_dying(q))
88
-		res = entry->store(ctx, page, length);
97
+	res = entry->store(ctx, page, length);
89
98
 	mutex_unlock(&q->sysfs_lock);
90
99
 	return res;
91
100
 }
..
..
@@ -105,10 +114,8 @@
105
114
 	if (!entry->show)
106
115
 		return -EIO;
107
116
 
108
-	res = -ENOENT;
109
117
 	mutex_lock(&q->sysfs_lock);
110
-	if (!blk_queue_dying(q))
111
-		res = entry->show(hctx, page);
118
+	res = entry->show(hctx, page);
112
119
 	mutex_unlock(&q->sysfs_lock);
113
120
 	return res;
114
121
 }
..
..
@@ -129,10 +136,8 @@
129
136
 	if (!entry->store)
130
137
 		return -EIO;
131
138
 
132
-	res = -ENOENT;
133
139
 	mutex_lock(&q->sysfs_lock);
134
-	if (!blk_queue_dying(q))
135
-		res = entry->store(hctx, page, length);
140
+	res = entry->store(hctx, page, length);
136
141
 	mutex_unlock(&q->sysfs_lock);
137
142
 	return res;
138
143
 }
..
..
@@ -172,10 +177,6 @@
172
177
 	return pos + ret;
173
178
 }
174
179
 
175
-static struct attribute *default_ctx_attrs[] = {
176
-	NULL,
177
-};
178
-
179
180
 static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_nr_tags = {
180
181
 	.attr = {.name = "nr_tags", .mode = 0444 },
181
182
 	.show = blk_mq_hw_sysfs_nr_tags_show,
..
..
@@ -195,6 +196,7 @@
195
196
 	&blk_mq_hw_sysfs_cpus.attr,
196
197
 	NULL,
197
198
 };
199
+ATTRIBUTE_GROUPS(default_hw_ctx);
198
200
 
199
201
 static const struct sysfs_ops blk_mq_sysfs_ops = {
200
202
 	.show	= blk_mq_sysfs_show,
..
..
@@ -213,13 +215,12 @@
213
215
 
214
216
 static struct kobj_type blk_mq_ctx_ktype = {
215
217
 	.sysfs_ops	= &blk_mq_sysfs_ops,
216
-	.default_attrs	= default_ctx_attrs,
217
-	.release	= blk_mq_sysfs_release,
218
+	.release	= blk_mq_ctx_sysfs_release,
218
219
 };
219
220
 
220
221
 static struct kobj_type blk_mq_hw_ktype = {
221
222
 	.sysfs_ops	= &blk_mq_hw_sysfs_ops,
222
-	.default_attrs	= default_hw_ctx_attrs,
223
+	.default_groups = default_hw_ctx_groups,
223
224
 	.release	= blk_mq_hw_sysfs_release,
224
225
 };
225
226
 
..
..
@@ -241,21 +242,28 @@
241
242
 {
242
243
 	struct request_queue *q = hctx->queue;
243
244
 	struct blk_mq_ctx *ctx;
244
-	int i, ret;
245
+	int i, j, ret;
245
246
 
246
247
 	if (!hctx->nr_ctx)
247
248
 		return 0;
248
249
 
249
-	ret = kobject_add(&hctx->kobj, &q->mq_kobj, "%u", hctx->queue_num);
250
+	ret = kobject_add(&hctx->kobj, q->mq_kobj, "%u", hctx->queue_num);
250
251
 	if (ret)
251
252
 		return ret;
252
253
 
253
254
 	hctx_for_each_ctx(hctx, ctx, i) {
254
255
 		ret = kobject_add(&ctx->kobj, &hctx->kobj, "cpu%u", ctx->cpu);
255
256
 		if (ret)
256
-			break;
257
+			goto out;
257
258
 	}
258
259
 
260
+	return 0;
261
+out:
262
+	hctx_for_each_ctx(hctx, ctx, j) {
263
+		if (j < i)
264
+			kobject_del(&ctx->kobj);
265
+	}
266
+	kobject_del(&hctx->kobj);
259
267
 	return ret;
260
268
 }
261
269
 
..
..
@@ -264,13 +272,13 @@
264
272
 	struct blk_mq_hw_ctx *hctx;
265
273
 	int i;
266
274
 
267
-	lockdep_assert_held(&q->sysfs_lock);
275
+	lockdep_assert_held(&q->sysfs_dir_lock);
268
276
 
269
277
 	queue_for_each_hw_ctx(q, hctx, i)
270
278
 		blk_mq_unregister_hctx(hctx);
271
279
 
272
-	kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
273
-	kobject_del(&q->mq_kobj);
280
+	kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
281
+	kobject_del(q->mq_kobj);
274
282
 	kobject_put(&dev->kobj);
275
283
 
276
284
 	q->mq_sysfs_init_done = false;
..
..
@@ -290,7 +298,7 @@
290
298
 		ctx = per_cpu_ptr(q->queue_ctx, cpu);
291
299
 		kobject_put(&ctx->kobj);
292
300
 	}
293
-	kobject_put(&q->mq_kobj);
301
+	kobject_put(q->mq_kobj);
294
302
 }
295
303
 
296
304
 void blk_mq_sysfs_init(struct request_queue *q)
..
..
@@ -298,10 +306,12 @@
298
306
 	struct blk_mq_ctx *ctx;
299
307
 	int cpu;
300
308
 
301
-	kobject_init(&q->mq_kobj, &blk_mq_ktype);
309
+	kobject_init(q->mq_kobj, &blk_mq_ktype);
302
310
 
303
311
 	for_each_possible_cpu(cpu) {
304
312
 		ctx = per_cpu_ptr(q->queue_ctx, cpu);
313
+
314
+		kobject_get(q->mq_kobj);
305
315
 		kobject_init(&ctx->kobj, &blk_mq_ctx_ktype);
306
316
 	}
307
317
 }
..
..
@@ -312,13 +322,13 @@
312
322
 	int ret, i;
313
323
 
314
324
 	WARN_ON_ONCE(!q->kobj.parent);
315
-	lockdep_assert_held(&q->sysfs_lock);
325
+	lockdep_assert_held(&q->sysfs_dir_lock);
316
326
 
317
-	ret = kobject_add(&q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
327
+	ret = kobject_add(q->mq_kobj, kobject_get(&dev->kobj), "%s", "mq");
318
328
 	if (ret < 0)
319
329
 		goto out;
320
330
 
321
-	kobject_uevent(&q->mq_kobj, KOBJ_ADD);
331
+	kobject_uevent(q->mq_kobj, KOBJ_ADD);
322
332
 
323
333
 	queue_for_each_hw_ctx(q, hctx, i) {
324
334
 		ret = blk_mq_register_hctx(hctx);
..
..
@@ -335,30 +345,18 @@
335
345
 	while (--i >= 0)
336
346
 		blk_mq_unregister_hctx(q->queue_hw_ctx[i]);
337
347
 
338
-	kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
339
-	kobject_del(&q->mq_kobj);
348
+	kobject_uevent(q->mq_kobj, KOBJ_REMOVE);
349
+	kobject_del(q->mq_kobj);
340
350
 	kobject_put(&dev->kobj);
341
351
 	return ret;
342
352
 }
343
-
344
-int blk_mq_register_dev(struct device *dev, struct request_queue *q)
345
-{
346
-	int ret;
347
-
348
-	mutex_lock(&q->sysfs_lock);
349
-	ret = __blk_mq_register_dev(dev, q);
350
-	mutex_unlock(&q->sysfs_lock);
351
-
352
-	return ret;
353
-}
354
-EXPORT_SYMBOL_GPL(blk_mq_register_dev);
355
353
 
356
354
 void blk_mq_sysfs_unregister(struct request_queue *q)
357
355
 {
358
356
 	struct blk_mq_hw_ctx *hctx;
359
357
 	int i;
360
358
 
361
-	mutex_lock(&q->sysfs_lock);
359
+	mutex_lock(&q->sysfs_dir_lock);
362
360
 	if (!q->mq_sysfs_init_done)
363
361
 		goto unlock;
364
362
 
..
..
@@ -366,7 +364,7 @@
366
364
 		blk_mq_unregister_hctx(hctx);
367
365
 
368
366
 unlock:
369
-	mutex_unlock(&q->sysfs_lock);
367
+	mutex_unlock(&q->sysfs_dir_lock);
370
368
 }
371
369
 
372
370
 int blk_mq_sysfs_register(struct request_queue *q)
..
..
@@ -374,7 +372,7 @@
374
372
 	struct blk_mq_hw_ctx *hctx;
375
373
 	int i, ret = 0;
376
374
 
377
-	mutex_lock(&q->sysfs_lock);
375
+	mutex_lock(&q->sysfs_dir_lock);
378
376
 	if (!q->mq_sysfs_init_done)
379
377
 		goto unlock;
380
378
 
..
..
@@ -385,7 +383,7 @@
385
383
 	}
386
384
 
387
385
 unlock:
388
-	mutex_unlock(&q->sysfs_lock);
386
+	mutex_unlock(&q->sysfs_dir_lock);
389
387
 
390
388
 	return ret;
391
389
 }