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2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777 
 kernel/drivers/remoteproc/qcom_common.c
....@@ -1,18 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Qualcomm Peripheral Image Loader helpers
34  *
45  * Copyright (C) 2016 Linaro Ltd
56  * Copyright (C) 2015 Sony Mobile Communications Inc
67  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
7
- *
8
- * This program is free software; you can redistribute it and/or
9
- * modify it under the terms of the GNU General Public License
10
- * version 2 as published by the Free Software Foundation.
11
- *
12
- * This program is distributed in the hope that it will be useful,
13
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15
- * GNU General Public License for more details.
168  */
179 
1810 #include <linux/firmware.h>
....@@ -20,8 +12,10 @@
2012 #include <linux/module.h>
2113 #include <linux/notifier.h>
2214 #include <linux/remoteproc.h>
15
+#include <linux/remoteproc/qcom_rproc.h>
2316 #include <linux/rpmsg/qcom_glink.h>
2417 #include <linux/rpmsg/qcom_smd.h>
18
+#include <linux/slab.h>
2519 #include <linux/soc/qcom/mdt_loader.h>
2620 
2721 #include "remoteproc_internal.h"
....@@ -31,7 +25,14 @@
3125 #define to_smd_subdev(d) container_of(d, struct qcom_rproc_subdev, subdev)
3226 #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr, subdev)
3327 
34
-static BLOCKING_NOTIFIER_HEAD(ssr_notifiers);
28
+struct qcom_ssr_subsystem {
29
+	const char *name;
30
+	struct srcu_notifier_head notifier_list;
31
+	struct list_head list;
32
+};
33
+
34
+static LIST_HEAD(qcom_ssr_subsystem_list);
35
+static DEFINE_MUTEX(qcom_ssr_subsys_lock);
3536 
3637 static int glink_subdev_start(struct rproc_subdev *subdev)
3738 {
....@@ -50,12 +51,21 @@
5051 	glink->edge = NULL;
5152 }
5253 
54
+static void glink_subdev_unprepare(struct rproc_subdev *subdev)
55
+{
56
+	struct qcom_rproc_glink *glink = to_glink_subdev(subdev);
57
+
58
+	qcom_glink_ssr_notify(glink->ssr_name);
59
+}
60
+
5361 /**
5462  * qcom_add_glink_subdev() - try to add a GLINK subdevice to rproc
5563  * @rproc:	rproc handle to parent the subdevice
5664  * @glink:	reference to a GLINK subdev context
65
+ * @ssr_name:	identifier of the associated remoteproc for ssr notifications
5766  */
58
-void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink)
67
+void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
68
+			   const char *ssr_name)
5969 {
6070 	struct device *dev = &rproc->dev;
6171 
....@@ -63,9 +73,14 @@
6373 	if (!glink->node)
6474 		return;
6575 
76
+	glink->ssr_name = kstrdup_const(ssr_name, GFP_KERNEL);
77
+	if (!glink->ssr_name)
78
+		return;
79
+
6680 	glink->dev = dev;
6781 	glink->subdev.start = glink_subdev_start;
6882 	glink->subdev.stop = glink_subdev_stop;
83
+	glink->subdev.unprepare = glink_subdev_unprepare;
6984 
7085 	rproc_add_subdev(rproc, &glink->subdev);
7186 }
....@@ -82,6 +97,7 @@
8297 		return;
8398 
8499 	rproc_remove_subdev(rproc, &glink->subdev);
100
+	kfree_const(glink->ssr_name);
85101 	of_node_put(glink->node);
86102 }
87103 EXPORT_SYMBOL_GPL(qcom_remove_glink_subdev);
....@@ -182,37 +198,122 @@
182198 }
183199 EXPORT_SYMBOL_GPL(qcom_remove_smd_subdev);
184200 
201
+static struct qcom_ssr_subsystem *qcom_ssr_get_subsys(const char *name)
202
+{
203
+	struct qcom_ssr_subsystem *info;
204
+
205
+	mutex_lock(&qcom_ssr_subsys_lock);
206
+	/* Match in the global qcom_ssr_subsystem_list with name */
207
+	list_for_each_entry(info, &qcom_ssr_subsystem_list, list)
208
+		if (!strcmp(info->name, name))
209
+			goto out;
210
+
211
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
212
+	if (!info) {
213
+		info = ERR_PTR(-ENOMEM);
214
+		goto out;
215
+	}
216
+	info->name = kstrdup_const(name, GFP_KERNEL);
217
+	srcu_init_notifier_head(&info->notifier_list);
218
+
219
+	/* Add to global notification list */
220
+	list_add_tail(&info->list, &qcom_ssr_subsystem_list);
221
+
222
+out:
223
+	mutex_unlock(&qcom_ssr_subsys_lock);
224
+	return info;
225
+}
226
+
185227 /**
186228  * qcom_register_ssr_notifier() - register SSR notification handler
187
- * @nb:		notifier_block to notify for restart notifications
229
+ * @name:	Subsystem's SSR name
230
+ * @nb:		notifier_block to be invoked upon subsystem's state change
188231  *
189
- * Returns 0 on success, negative errno on failure.
232
+ * This registers the @nb notifier block as part the notifier chain for a
233
+ * remoteproc associated with @name. The notifier block's callback
234
+ * will be invoked when the remote processor's SSR events occur
235
+ * (pre/post startup and pre/post shutdown).
190236  *
191
- * This register the @notify function as handler for restart notifications. As
192
- * remote processors are stopped this function will be called, with the SSR
193
- * name passed as a parameter.
237
+ * Return: a subsystem cookie on success, ERR_PTR on failure.
194238  */
195
-int qcom_register_ssr_notifier(struct notifier_block *nb)
239
+void *qcom_register_ssr_notifier(const char *name, struct notifier_block *nb)
196240 {
197
-	return blocking_notifier_chain_register(&ssr_notifiers, nb);
241
+	struct qcom_ssr_subsystem *info;
242
+
243
+	info = qcom_ssr_get_subsys(name);
244
+	if (IS_ERR(info))
245
+		return info;
246
+
247
+	srcu_notifier_chain_register(&info->notifier_list, nb);
248
+
249
+	return &info->notifier_list;
198250 }
199251 EXPORT_SYMBOL_GPL(qcom_register_ssr_notifier);
200252 
201253 /**
202254  * qcom_unregister_ssr_notifier() - unregister SSR notification handler
255
+ * @notify:	subsystem cookie returned from qcom_register_ssr_notifier
203256  * @nb:		notifier_block to unregister
257
+ *
258
+ * This function will unregister the notifier from the particular notifier
259
+ * chain.
260
+ *
261
+ * Return: 0 on success, %ENOENT otherwise.
204262  */
205
-void qcom_unregister_ssr_notifier(struct notifier_block *nb)
263
+int qcom_unregister_ssr_notifier(void *notify, struct notifier_block *nb)
206264 {
207
-	blocking_notifier_chain_unregister(&ssr_notifiers, nb);
265
+	return srcu_notifier_chain_unregister(notify, nb);
208266 }
209267 EXPORT_SYMBOL_GPL(qcom_unregister_ssr_notifier);
268
+
269
+static int ssr_notify_prepare(struct rproc_subdev *subdev)
270
+{
271
+	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
272
+	struct qcom_ssr_notify_data data = {
273
+		.name = ssr->info->name,
274
+		.crashed = false,
275
+	};
276
+
277
+	srcu_notifier_call_chain(&ssr->info->notifier_list,
278
+				 QCOM_SSR_BEFORE_POWERUP, &data);
279
+	return 0;
280
+}
281
+
282
+static int ssr_notify_start(struct rproc_subdev *subdev)
283
+{
284
+	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
285
+	struct qcom_ssr_notify_data data = {
286
+		.name = ssr->info->name,
287
+		.crashed = false,
288
+	};
289
+
290
+	srcu_notifier_call_chain(&ssr->info->notifier_list,
291
+				 QCOM_SSR_AFTER_POWERUP, &data);
292
+	return 0;
293
+}
210294 
211295 static void ssr_notify_stop(struct rproc_subdev *subdev, bool crashed)
212296 {
213297 	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
298
+	struct qcom_ssr_notify_data data = {
299
+		.name = ssr->info->name,
300
+		.crashed = crashed,
301
+	};
214302 
215
-	blocking_notifier_call_chain(&ssr_notifiers, 0, (void *)ssr->name);
303
+	srcu_notifier_call_chain(&ssr->info->notifier_list,
304
+				 QCOM_SSR_BEFORE_SHUTDOWN, &data);
305
+}
306
+
307
+static void ssr_notify_unprepare(struct rproc_subdev *subdev)
308
+{
309
+	struct qcom_rproc_ssr *ssr = to_ssr_subdev(subdev);
310
+	struct qcom_ssr_notify_data data = {
311
+		.name = ssr->info->name,
312
+		.crashed = false,
313
+	};
314
+
315
+	srcu_notifier_call_chain(&ssr->info->notifier_list,
316
+				 QCOM_SSR_AFTER_SHUTDOWN, &data);
216317 }
217318 
218319 /**
....@@ -222,13 +323,25 @@
222323  * @ssr_name:	identifier to use for notifications originating from @rproc
223324  *
224325  * As the @ssr is registered with the @rproc SSR events will be sent to all
225
- * registered listeners in the system as the remoteproc is shut down.
326
+ * registered listeners for the remoteproc when it's SSR events occur
327
+ * (pre/post startup and pre/post shutdown).
226328  */
227329 void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
228330 			 const char *ssr_name)
229331 {
230
-	ssr->name = ssr_name;
332
+	struct qcom_ssr_subsystem *info;
333
+
334
+	info = qcom_ssr_get_subsys(ssr_name);
335
+	if (IS_ERR(info)) {
336
+		dev_err(&rproc->dev, "Failed to add ssr subdevice\n");
337
+		return;
338
+	}
339
+
340
+	ssr->info = info;
341
+	ssr->subdev.prepare = ssr_notify_prepare;
342
+	ssr->subdev.start = ssr_notify_start;
231343 	ssr->subdev.stop = ssr_notify_stop;
344
+	ssr->subdev.unprepare = ssr_notify_unprepare;
232345 
233346 	rproc_add_subdev(rproc, &ssr->subdev);
234347 }
....@@ -242,6 +355,7 @@
242355 void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr)
243356 {
244357 	rproc_remove_subdev(rproc, &ssr->subdev);
358
+	ssr->info = NULL;
245359 }
246360 EXPORT_SYMBOL_GPL(qcom_remove_ssr_subdev);
247361