[linux.git] / drivers / staging / android / sync_debug.c

/*
 * drivers/base/sync.c
 *
 * Copyright (C) 2012 Google, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

#include <linux/debugfs.h>
#include <linux/export.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/poll.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/anon_inodes.h>
#include "sync.h"

#ifdef CONFIG_DEBUG_FS

static LIST_HEAD(sync_timeline_list_head);
static DEFINE_SPINLOCK(sync_timeline_list_lock);
static LIST_HEAD(sync_fence_list_head);
static DEFINE_SPINLOCK(sync_fence_list_lock);

void sync_timeline_debug_add(struct sync_timeline *obj)
{
	unsigned long flags;

	spin_lock_irqsave(&sync_timeline_list_lock, flags);
	list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
}

void sync_timeline_debug_remove(struct sync_timeline *obj)
{
	unsigned long flags;

	spin_lock_irqsave(&sync_timeline_list_lock, flags);
	list_del(&obj->sync_timeline_list);
	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
}

void sync_fence_debug_add(struct sync_fence *fence)
{
	unsigned long flags;

	spin_lock_irqsave(&sync_fence_list_lock, flags);
	list_add_tail(&fence->sync_fence_list, &sync_fence_list_head);
	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
}

void sync_fence_debug_remove(struct sync_fence *fence)
{
	unsigned long flags;

	spin_lock_irqsave(&sync_fence_list_lock, flags);
	list_del(&fence->sync_fence_list);
	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
}

static const char *sync_status_str(int status)
{
	if (status == 0)
		return "signaled";
	else if (status > 0)
		return "active";
	else
		return "error";
}

static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence)
{
	int status = 1;
	struct sync_timeline *parent = sync_pt_parent(pt);

	if (fence_is_signaled_locked(&pt->base))
		status = pt->base.status;

	seq_printf(s, "  %s%spt %s",
		   fence ? parent->name : "",
		   fence ? "_" : "",
		   sync_status_str(status));

	if (status <= 0) {
		struct timeval tv = ktime_to_timeval(pt->base.timestamp);
		seq_printf(s, "@%ld.%06ld", tv.tv_sec, tv.tv_usec);
	}

	if (parent->ops->timeline_value_str &&
	    parent->ops->pt_value_str) {
		char value[64];
		parent->ops->pt_value_str(pt, value, sizeof(value));
		seq_printf(s, ": %s", value);
		if (fence) {
			parent->ops->timeline_value_str(parent, value,
						    sizeof(value));
			seq_printf(s, " / %s", value);
		}
	}

	seq_puts(s, "\n");
}

static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
{
	struct list_head *pos;
	unsigned long flags;

	seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);

	if (obj->ops->timeline_value_str) {
		char value[64];
		obj->ops->timeline_value_str(obj, value, sizeof(value));
		seq_printf(s, ": %s", value);
	}

	seq_puts(s, "\n");

	spin_lock_irqsave(&obj->child_list_lock, flags);
	list_for_each(pos, &obj->child_list_head) {
		struct sync_pt *pt =
			container_of(pos, struct sync_pt, child_list);
		sync_print_pt(s, pt, false);
	}
	spin_unlock_irqrestore(&obj->child_list_lock, flags);
}

static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
{
	wait_queue_t *pos;
	unsigned long flags;
	int i;

	seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
		   sync_status_str(atomic_read(&fence->status)));

	for (i = 0; i < fence->num_fences; ++i) {
		struct sync_pt *pt =
			container_of(fence->cbs[i].sync_pt,
				     struct sync_pt, base);

		sync_print_pt(s, pt, true);
	}

	spin_lock_irqsave(&fence->wq.lock, flags);
	list_for_each_entry(pos, &fence->wq.task_list, task_list) {
		struct sync_fence_waiter *waiter;

		if (pos->func != &sync_fence_wake_up_wq)
			continue;

		waiter = container_of(pos, struct sync_fence_waiter, work);

		seq_printf(s, "waiter %pF\n", waiter->callback);
	}
	spin_unlock_irqrestore(&fence->wq.lock, flags);
}

static int sync_debugfs_show(struct seq_file *s, void *unused)
{
	unsigned long flags;
	struct list_head *pos;

	seq_puts(s, "objs:\n--------------\n");

	spin_lock_irqsave(&sync_timeline_list_lock, flags);
	list_for_each(pos, &sync_timeline_list_head) {
		struct sync_timeline *obj =
			container_of(pos, struct sync_timeline,
				     sync_timeline_list);

		sync_print_obj(s, obj);
		seq_puts(s, "\n");
	}
	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);

	seq_puts(s, "fences:\n--------------\n");

	spin_lock_irqsave(&sync_fence_list_lock, flags);
	list_for_each(pos, &sync_fence_list_head) {
		struct sync_fence *fence =
			container_of(pos, struct sync_fence, sync_fence_list);

		sync_print_fence(s, fence);
		seq_puts(s, "\n");
	}
	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
	return 0;
}

static int sync_debugfs_open(struct inode *inode, struct file *file)
{
	return single_open(file, sync_debugfs_show, inode->i_private);
}

static const struct file_operations sync_debugfs_fops = {
	.open           = sync_debugfs_open,
	.read           = seq_read,
	.llseek         = seq_lseek,
	.release        = single_release,
};

static __init int sync_debugfs_init(void)
{
	debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);
	return 0;
}
late_initcall(sync_debugfs_init);

#define DUMP_CHUNK 256
static char sync_dump_buf[64 * 1024];
void sync_dump(void)
{
	struct seq_file s = {
		.buf = sync_dump_buf,
		.size = sizeof(sync_dump_buf) - 1,
	};
	int i;

	sync_debugfs_show(&s, NULL);

	for (i = 0; i < s.count; i += DUMP_CHUNK) {
		if ((s.count - i) > DUMP_CHUNK) {
			char c = s.buf[i + DUMP_CHUNK];
			s.buf[i + DUMP_CHUNK] = 0;
			pr_cont("%s", s.buf + i);
			s.buf[i + DUMP_CHUNK] = c;
		} else {
			s.buf[s.count] = 0;
			pr_cont("%s", s.buf + i);
		}
	}
}

#endif
Commit	Line	Data
0f0d8406 ML	1	/*
	2	* drivers/base/sync.c
	3	*
	4	* Copyright (C) 2012 Google, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	*/
	16
	17	#include <linux/debugfs.h>
	18	#include <linux/export.h>
	19	#include <linux/file.h>
	20	#include <linux/fs.h>
	21	#include <linux/kernel.h>
	22	#include <linux/poll.h>
	23	#include <linux/sched.h>
	24	#include <linux/seq_file.h>
	25	#include <linux/slab.h>
	26	#include <linux/uaccess.h>
	27	#include <linux/anon_inodes.h>
	28	#include "sync.h"
	29
	30	#ifdef CONFIG_DEBUG_FS
	31
	32	static LIST_HEAD(sync_timeline_list_head);
	33	static DEFINE_SPINLOCK(sync_timeline_list_lock);
	34	static LIST_HEAD(sync_fence_list_head);
	35	static DEFINE_SPINLOCK(sync_fence_list_lock);
	36
	37	void sync_timeline_debug_add(struct sync_timeline *obj)
	38	{
	39	unsigned long flags;
	40
	41	spin_lock_irqsave(&sync_timeline_list_lock, flags);
	42	list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
	43	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
	44	}
	45
	46	void sync_timeline_debug_remove(struct sync_timeline *obj)
	47	{
	48	unsigned long flags;
	49
	50	spin_lock_irqsave(&sync_timeline_list_lock, flags);
	51	list_del(&obj->sync_timeline_list);
	52	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
	53	}
	54
	55	void sync_fence_debug_add(struct sync_fence *fence)
	56	{
	57	unsigned long flags;
	58
	59	spin_lock_irqsave(&sync_fence_list_lock, flags);
	60	list_add_tail(&fence->sync_fence_list, &sync_fence_list_head);
	61	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
	62	}
	63
	64	void sync_fence_debug_remove(struct sync_fence *fence)
65	{
66	unsigned long flags;
67
68	spin_lock_irqsave(&sync_fence_list_lock, flags);
69	list_del(&fence->sync_fence_list);
70	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
71	}
72
73	static const char *sync_status_str(int status)
74	{
75	if (status == 0)
76	return "signaled";
77	else if (status > 0)
78	return "active";
79	else
80	return "error";
81	}
82
83	static void sync_print_pt(struct seq_file s, struct sync_pt pt, bool fence)
84	{
85	int status = 1;
86	struct sync_timeline *parent = sync_pt_parent(pt);
87
88	if (fence_is_signaled_locked(&pt->base))
89	status = pt->base.status;
90
91	seq_printf(s, " %s%spt %s",
92	fence ? parent->name : "",
93	fence ? "_" : "",
94	sync_status_str(status));
95
96	if (status <= 0) {
97	struct timeval tv = ktime_to_timeval(pt->base.timestamp);
98	seq_printf(s, "@%ld.%06ld", tv.tv_sec, tv.tv_usec);
99	}
100
101	if (parent->ops->timeline_value_str &&
102	parent->ops->pt_value_str) {
103	char value[64];
104	parent->ops->pt_value_str(pt, value, sizeof(value));
105	seq_printf(s, ": %s", value);
106	if (fence) {
107	parent->ops->timeline_value_str(parent, value,
108	sizeof(value));
109	seq_printf(s, " / %s", value);
110	}
111	}
112
113	seq_puts(s, "\n");
114	}
115
116	static void sync_print_obj(struct seq_file s, struct sync_timeline obj)
117	{
118	struct list_head *pos;
119	unsigned long flags;
120
121	seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
122
123	if (obj->ops->timeline_value_str) {
124	char value[64];
125	obj->ops->timeline_value_str(obj, value, sizeof(value));
126	seq_printf(s, ": %s", value);
127	}
128
129	seq_puts(s, "\n");
130
131	spin_lock_irqsave(&obj->child_list_lock, flags);
132	list_for_each(pos, &obj->child_list_head) {
133	struct sync_pt *pt =
134	container_of(pos, struct sync_pt, child_list);
135	sync_print_pt(s, pt, false);
136	}
137	spin_unlock_irqrestore(&obj->child_list_lock, flags);
138	}
139
140	static void sync_print_fence(struct seq_file s, struct sync_fence fence)
141	{
142	wait_queue_t *pos;
143	unsigned long flags;
144	int i;
145
146	seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
147	sync_status_str(atomic_read(&fence->status)));
148
149	for (i = 0; i < fence->num_fences; ++i) {
150	struct sync_pt *pt =
151	container_of(fence->cbs[i].sync_pt,
152	struct sync_pt, base);
153
154	sync_print_pt(s, pt, true);
155	}
156
157	spin_lock_irqsave(&fence->wq.lock, flags);
158	list_for_each_entry(pos, &fence->wq.task_list, task_list) {
159	struct sync_fence_waiter *waiter;
160
161	if (pos->func != &sync_fence_wake_up_wq)
162	continue;
163
164	waiter = container_of(pos, struct sync_fence_waiter, work);
165
166	seq_printf(s, "waiter %pF\n", waiter->callback);
167	}
168	spin_unlock_irqrestore(&fence->wq.lock, flags);
169	}
170
171	static int sync_debugfs_show(struct seq_file s, void unused)
172	{
173	unsigned long flags;
174	struct list_head *pos;
175
176	seq_puts(s, "objs:\n--------------\n");
177
178	spin_lock_irqsave(&sync_timeline_list_lock, flags);
179	list_for_each(pos, &sync_timeline_list_head) {
180	struct sync_timeline *obj =
181	container_of(pos, struct sync_timeline,
182	sync_timeline_list);
183
184	sync_print_obj(s, obj);
185	seq_puts(s, "\n");
186	}
187	spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
188
189	seq_puts(s, "fences:\n--------------\n");
190
191	spin_lock_irqsave(&sync_fence_list_lock, flags);
192	list_for_each(pos, &sync_fence_list_head) {
193	struct sync_fence *fence =
194	container_of(pos, struct sync_fence, sync_fence_list);
195
196	sync_print_fence(s, fence);
197	seq_puts(s, "\n");
198	}
199	spin_unlock_irqrestore(&sync_fence_list_lock, flags);
200	return 0;
201	}
202
203	static int sync_debugfs_open(struct inode inode, struct file file)
204	{
205	return single_open(file, sync_debugfs_show, inode->i_private);
206	}
207
208	static const struct file_operations sync_debugfs_fops = {
209	.open = sync_debugfs_open,
210	.read = seq_read,
211	.llseek = seq_lseek,
212	.release = single_release,
213	};
214
215	static __init int sync_debugfs_init(void)
216	{
217	debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);
218	return 0;
219	}
220	late_initcall(sync_debugfs_init);
221
222	#define DUMP_CHUNK 256
223	static char sync_dump_buf[64 * 1024];
224	void sync_dump(void)
225	{
226	struct seq_file s = {
227	.buf = sync_dump_buf,
228	.size = sizeof(sync_dump_buf) - 1,
229	};
230	int i;
231
232	sync_debugfs_show(&s, NULL);
233
234	for (i = 0; i < s.count; i += DUMP_CHUNK) {
235	if ((s.count - i) > DUMP_CHUNK) {
236	char c = s.buf[i + DUMP_CHUNK];
237	s.buf[i + DUMP_CHUNK] = 0;
238	pr_cont("%s", s.buf + i);
239	s.buf[i + DUMP_CHUNK] = c;
240	} else {
241	s.buf[s.count] = 0;
242	pr_cont("%s", s.buf + i);
243	}
244	}
245	}
246
247	#endif