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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 kernel/drivers/acpi/power.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * drivers/acpi/power.c - ACPI Power Resources management.
34  *
....@@ -5,20 +6,6 @@
56  * Author: Andy Grover <andrew.grover@intel.com>
67  * Author: Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
78  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
8
- *
9
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
10
- *
11
- *  This program is free software; you can redistribute it and/or modify
12
- *  it under the terms of the GNU General Public License as published by
13
- *  the Free Software Foundation; either version 2 of the License, or (at
14
- *  your option) any later version.
15
- *
16
- *  This program is distributed in the hope that it will be useful, but
17
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
18
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
19
- *  General Public License for more details.
20
- *
21
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
229  */
2310 
2411 /*
....@@ -26,7 +13,7 @@
2613  * 1. via "Device Specific (D-State) Control"
2714  * 2. via "Power Resource Control".
2815  * The code below deals with ACPI Power Resources control.
29
- * 
16
+ *
3017  * An ACPI "power resource object" represents a software controllable power
3118  * plane, clock plane, or other resource depended on by a device.
3219  *
....@@ -49,11 +36,14 @@
4936 ACPI_MODULE_NAME("power");
5037 #define ACPI_POWER_CLASS		"power_resource"
5138 #define ACPI_POWER_DEVICE_NAME		"Power Resource"
52
-#define ACPI_POWER_FILE_INFO		"info"
53
-#define ACPI_POWER_FILE_STATUS		"state"
5439 #define ACPI_POWER_RESOURCE_STATE_OFF	0x00
5540 #define ACPI_POWER_RESOURCE_STATE_ON	0x01
5641 #define ACPI_POWER_RESOURCE_STATE_UNKNOWN 0xFF
42
+
43
+struct acpi_power_dependent_device {
44
+	struct device *dev;
45
+	struct list_head node;
46
+};
5747 
5848 struct acpi_power_resource {
5949 	struct acpi_device device;
....@@ -64,6 +54,7 @@
6454 	unsigned int ref_count;
6555 	bool wakeup_enabled;
6656 	struct mutex resource_lock;
57
+	struct list_head dependents;
6758 };
6859 
6960 struct acpi_power_resource_entry {
....@@ -245,8 +236,121 @@
245236 	return 0;
246237 }
247238 
239
+static int
240
+acpi_power_resource_add_dependent(struct acpi_power_resource *resource,
241
+				  struct device *dev)
242
+{
243
+	struct acpi_power_dependent_device *dep;
244
+	int ret = 0;
245
+
246
+	mutex_lock(&resource->resource_lock);
247
+	list_for_each_entry(dep, &resource->dependents, node) {
248
+		/* Only add it once */
249
+		if (dep->dev == dev)
250
+			goto unlock;
251
+	}
252
+
253
+	dep = kzalloc(sizeof(*dep), GFP_KERNEL);
254
+	if (!dep) {
255
+		ret = -ENOMEM;
256
+		goto unlock;
257
+	}
258
+
259
+	dep->dev = dev;
260
+	list_add_tail(&dep->node, &resource->dependents);
261
+	dev_dbg(dev, "added power dependency to [%s]\n", resource->name);
262
+
263
+unlock:
264
+	mutex_unlock(&resource->resource_lock);
265
+	return ret;
266
+}
267
+
268
+static void
269
+acpi_power_resource_remove_dependent(struct acpi_power_resource *resource,
270
+				     struct device *dev)
271
+{
272
+	struct acpi_power_dependent_device *dep;
273
+
274
+	mutex_lock(&resource->resource_lock);
275
+	list_for_each_entry(dep, &resource->dependents, node) {
276
+		if (dep->dev == dev) {
277
+			list_del(&dep->node);
278
+			kfree(dep);
279
+			dev_dbg(dev, "removed power dependency to [%s]\n",
280
+				resource->name);
281
+			break;
282
+		}
283
+	}
284
+	mutex_unlock(&resource->resource_lock);
285
+}
286
+
287
+/**
288
+ * acpi_device_power_add_dependent - Add dependent device of this ACPI device
289
+ * @adev: ACPI device pointer
290
+ * @dev: Dependent device
291
+ *
292
+ * If @adev has non-empty _PR0 the @dev is added as dependent device to all
293
+ * power resources returned by it. This means that whenever these power
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+ * resources are turned _ON the dependent devices get runtime resumed. This
295
+ * is needed for devices such as PCI to allow its driver to re-initialize
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+ * it after it went to D0uninitialized.
297
+ *
298
+ * If @adev does not have _PR0 this does nothing.
299
+ *
300
+ * Returns %0 in case of success and negative errno otherwise.
301
+ */
302
+int acpi_device_power_add_dependent(struct acpi_device *adev,
303
+				    struct device *dev)
304
+{
305
+	struct acpi_power_resource_entry *entry;
306
+	struct list_head *resources;
307
+	int ret;
308
+
309
+	if (!adev->flags.power_manageable)
310
+		return 0;
311
+
312
+	resources = &adev->power.states[ACPI_STATE_D0].resources;
313
+	list_for_each_entry(entry, resources, node) {
314
+		ret = acpi_power_resource_add_dependent(entry->resource, dev);
315
+		if (ret)
316
+			goto err;
317
+	}
318
+
319
+	return 0;
320
+
321
+err:
322
+	list_for_each_entry(entry, resources, node)
323
+		acpi_power_resource_remove_dependent(entry->resource, dev);
324
+
325
+	return ret;
326
+}
327
+
328
+/**
329
+ * acpi_device_power_remove_dependent - Remove dependent device
330
+ * @adev: ACPI device pointer
331
+ * @dev: Dependent device
332
+ *
333
+ * Does the opposite of acpi_device_power_add_dependent() and removes the
334
+ * dependent device if it is found. Can be called to @adev that does not
335
+ * have _PR0 as well.
336
+ */
337
+void acpi_device_power_remove_dependent(struct acpi_device *adev,
338
+					struct device *dev)
339
+{
340
+	struct acpi_power_resource_entry *entry;
341
+	struct list_head *resources;
342
+
343
+	if (!adev->flags.power_manageable)
344
+		return;
345
+
346
+	resources = &adev->power.states[ACPI_STATE_D0].resources;
347
+	list_for_each_entry_reverse(entry, resources, node)
348
+		acpi_power_resource_remove_dependent(entry->resource, dev);
349
+}
350
+
248351 static int __acpi_power_on(struct acpi_power_resource *resource)
249352 {
353
+	struct acpi_power_dependent_device *dep;
250354 	acpi_status status = AE_OK;
251355 
252356 	status = acpi_evaluate_object(resource->device.handle, "_ON", NULL, NULL);
....@@ -255,6 +359,21 @@
255359 
256360 	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Power resource [%s] turned on\n",
257361 			  resource->name));
362
+
363
+	/*
364
+	 * If there are other dependents on this power resource we need to
365
+	 * resume them now so that their drivers can re-initialize the
366
+	 * hardware properly after it went back to D0.
367
+	 */
368
+	if (list_empty(&resource->dependents) ||
369
+	    list_is_singular(&resource->dependents))
370
+		return 0;
371
+
372
+	list_for_each_entry(dep, &resource->dependents, node) {
373
+		dev_dbg(dep->dev, "runtime resuming because [%s] turned on\n",
374
+			resource->name);
375
+		pm_request_resume(dep->dev);
376
+	}
258377 
259378 	return 0;
260379 }
....@@ -526,7 +645,7 @@
526645  * -ENODEV if the execution of either _DSW or _PSW has failed
527646  */
528647 int acpi_device_sleep_wake(struct acpi_device *dev,
529
-                           int enable, int sleep_state, int dev_state)
648
+			   int enable, int sleep_state, int dev_state)
530649 {
531650 	union acpi_object in_arg[3];
532651 	struct acpi_object_list arg_list = { 3, in_arg };
....@@ -535,12 +654,12 @@
535654 	/*
536655 	 * Try to execute _DSW first.
537656 	 *
538
-	 * Three agruments are needed for the _DSW object:
657
+	 * Three arguments are needed for the _DSW object:
539658 	 * Argument 0: enable/disable the wake capabilities
540659 	 * Argument 1: target system state
541660 	 * Argument 2: target device state
542661 	 * When _DSW object is called to disable the wake capabilities, maybe
543
-	 * the first argument is filled. The values of the other two agruments
662
+	 * the first argument is filled. The values of the other two arguments
544663 	 * are meaningless.
545664 	 */
546665 	in_arg[0].type = ACPI_TYPE_INTEGER;
....@@ -571,7 +690,7 @@
571690 
572691 /*
573692  * Prepare a wakeup device, two steps (Ref ACPI 2.0:P229):
574
- * 1. Power on the power resources required for the wakeup device 
693
+ * 1. Power on the power resources required for the wakeup device
575694  * 2. Execute _DSW (Device Sleep Wake) or (deprecated in ACPI 3.0) _PSW (Power
576695  *    State Wake) for the device, if present
577696  */
....@@ -767,15 +886,16 @@
767886 	kfree(resource);
768887 }
769888 
770
-static ssize_t acpi_power_in_use_show(struct device *dev,
771
-				      struct device_attribute *attr,
772
-				      char *buf) {
889
+static ssize_t resource_in_use_show(struct device *dev,
890
+				    struct device_attribute *attr,
891
+				    char *buf)
892
+{
773893 	struct acpi_power_resource *resource;
774894 
775895 	resource = to_power_resource(to_acpi_device(dev));
776896 	return sprintf(buf, "%u\n", !!resource->ref_count);
777897 }
778
-static DEVICE_ATTR(resource_in_use, 0444, acpi_power_in_use_show, NULL);
898
+static DEVICE_ATTR_RO(resource_in_use);
779899 
780900 static void acpi_power_sysfs_remove(struct acpi_device *device)
781901 {
....@@ -823,6 +943,7 @@
823943 				ACPI_STA_DEFAULT);
824944 	mutex_init(&resource->resource_lock);
825945 	INIT_LIST_HEAD(&resource->list_node);
946
+	INIT_LIST_HEAD(&resource->dependents);
826947 	resource->name = device->pnp.bus_id;
827948 	strcpy(acpi_device_name(device), ACPI_POWER_DEVICE_NAME);
828949 	strcpy(acpi_device_class(device), ACPI_POWER_CLASS);