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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/drivers/gpu/drm/msm/msm_rd.c
....@@ -1,18 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  * Copyright (C) 2013 Red Hat
34  * Author: Rob Clark <robdclark@gmail.com>
4
- *
5
- * This program is free software; you can redistribute it and/or modify it
6
- * under the terms of the GNU General Public License version 2 as published by
7
- * the Free Software Foundation.
8
- *
9
- * This program is distributed in the hope that it will be useful, but WITHOUT
10
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
12
- * more details.
13
- *
14
- * You should have received a copy of the GNU General Public License along with
15
- * this program.  If not, see <http://www.gnu.org/licenses/>.
165  */
176 
187 /* For debugging crashes, userspace can:
....@@ -40,20 +29,23 @@
4029  * or shader programs (if not emitted inline in cmdstream).
4130  */
4231 
43
-#ifdef CONFIG_DEBUG_FS
44
-
45
-#include <linux/kfifo.h>
46
-#include <linux/debugfs.h>
4732 #include <linux/circ_buf.h>
33
+#include <linux/debugfs.h>
34
+#include <linux/kfifo.h>
35
+#include <linux/uaccess.h>
4836 #include <linux/wait.h>
37
+
38
+#include <drm/drm_file.h>
4939 
5040 #include "msm_drv.h"
5141 #include "msm_gpu.h"
5242 #include "msm_gem.h"
5343 
54
-static bool rd_full = false;
44
+bool rd_full = false;
5545 MODULE_PARM_DESC(rd_full, "If true, $debugfs/.../rd will snapshot all buffer contents");
5646 module_param_named(rd_full, rd_full, bool, 0600);
47
+
48
+#ifdef CONFIG_DEBUG_FS
5749 
5850 enum rd_sect_type {
5951 	RD_NONE,
....@@ -199,6 +191,9 @@
199191 	file->private_data = rd;
200192 	rd->open = true;
201193 
194
+	/* Reset fifo to clear any previously unread data: */
195
+	rd->fifo.head = rd->fifo.tail = 0;
196
+
202197 	/* the parsing tools need to know gpu-id to know which
203198 	 * register database to load.
204199 	 */
....@@ -244,8 +239,6 @@
244239 static struct msm_rd_state *rd_init(struct drm_minor *minor, const char *name)
245240 {
246241 	struct msm_rd_state *rd;
247
-	struct dentry *ent;
248
-	int ret = 0;
249242 
250243 	rd = kzalloc(sizeof(*rd), GFP_KERNEL);
251244 	if (!rd)
....@@ -258,20 +251,10 @@
258251 
259252 	init_waitqueue_head(&rd->fifo_event);
260253 
261
-	ent = debugfs_create_file(name, S_IFREG | S_IRUGO,
262
-			minor->debugfs_root, rd, &rd_debugfs_fops);
263
-	if (!ent) {
264
-		DRM_ERROR("Cannot create /sys/kernel/debug/dri/%pd/%s\n",
265
-				minor->debugfs_root, name);
266
-		ret = -ENOMEM;
267
-		goto fail;
268
-	}
254
+	debugfs_create_file(name, S_IFREG | S_IRUGO, minor->debugfs_root, rd,
255
+			    &rd_debugfs_fops);
269256 
270257 	return rd;
271
-
272
-fail:
273
-	rd_cleanup(rd);
274
-	return ERR_PTR(ret);
275258 }
276259 
277260 int msm_rd_debugfs_init(struct drm_minor *minor)
....@@ -318,7 +301,7 @@
318301 
319302 static void snapshot_buf(struct msm_rd_state *rd,
320303 		struct msm_gem_submit *submit, int idx,
321
-		uint64_t iova, uint32_t size)
304
+		uint64_t iova, uint32_t size, bool full)
322305 {
323306 	struct msm_gem_object *obj = submit->bos[idx].obj;
324307 	unsigned offset = 0;
....@@ -337,6 +320,9 @@
337320 	 */
338321 	rd_write_section(rd, RD_GPUADDR,
339322 			(uint32_t[3]){ iova, size, iova >> 32 }, 12);
323
+
324
+	if (!full)
325
+		return;
340326 
341327 	/* But only dump the contents of buffers marked READ */
342328 	if (!(submit->bos[idx].flags & MSM_SUBMIT_BO_READ))
....@@ -374,7 +360,7 @@
374360 		va_list args;
375361 
376362 		va_start(args, fmt);
377
-		n = vsnprintf(msg, sizeof(msg), fmt, args);
363
+		n = vscnprintf(msg, sizeof(msg), fmt, args);
378364 		va_end(args);
379365 
380366 		rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4));
....@@ -383,29 +369,33 @@
383369 	rcu_read_lock();
384370 	task = pid_task(submit->pid, PIDTYPE_PID);
385371 	if (task) {
386
-		n = snprintf(msg, sizeof(msg), "%.*s/%d: fence=%u",
372
+		n = scnprintf(msg, sizeof(msg), "%.*s/%d: fence=%u",
387373 				TASK_COMM_LEN, task->comm,
388374 				pid_nr(submit->pid), submit->seqno);
389375 	} else {
390
-		n = snprintf(msg, sizeof(msg), "???/%d: fence=%u",
376
+		n = scnprintf(msg, sizeof(msg), "???/%d: fence=%u",
391377 				pid_nr(submit->pid), submit->seqno);
392378 	}
393379 	rcu_read_unlock();
394380 
395381 	rd_write_section(rd, RD_CMD, msg, ALIGN(n, 4));
396382 
397
-	for (i = 0; rd_full && i < submit->nr_bos; i++)
398
-		snapshot_buf(rd, submit, i, 0, 0);
383
+	for (i = 0; i < submit->nr_bos; i++)
384
+		snapshot_buf(rd, submit, i, 0, 0, should_dump(submit, i));
385
+
386
+	for (i = 0; i < submit->nr_cmds; i++) {
387
+		uint32_t szd  = submit->cmd[i].size; /* in dwords */
388
+
389
+		/* snapshot cmdstream bo's (if we haven't already): */
390
+		if (!should_dump(submit, i)) {
391
+			snapshot_buf(rd, submit, submit->cmd[i].idx,
392
+					submit->cmd[i].iova, szd * 4, true);
393
+		}
394
+	}
399395 
400396 	for (i = 0; i < submit->nr_cmds; i++) {
401397 		uint64_t iova = submit->cmd[i].iova;
402398 		uint32_t szd  = submit->cmd[i].size; /* in dwords */
403
-
404
-		/* snapshot cmdstream bo's (if we haven't already): */
405
-		if (!rd_full) {
406
-			snapshot_buf(rd, submit, submit->cmd[i].idx,
407
-					submit->cmd[i].iova, szd * 4);
408
-		}
409399 
410400 		switch (submit->cmd[i].type) {
411401 		case MSM_SUBMIT_CMD_IB_TARGET_BUF: