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/*
* 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
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