248 lines
6.0 KiB
C
248 lines
6.0 KiB
C
![]() |
/*
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* drivers/base/sync.c
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*
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* Copyright (C) 2012 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/debugfs.h>
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#include <linux/export.h>
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/kernel.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/anon_inodes.h>
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#include "sync.h"
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#ifdef CONFIG_DEBUG_FS
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static LIST_HEAD(sync_timeline_list_head);
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static DEFINE_SPINLOCK(sync_timeline_list_lock);
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static LIST_HEAD(sync_fence_list_head);
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static DEFINE_SPINLOCK(sync_fence_list_lock);
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void sync_timeline_debug_add(struct sync_timeline *obj)
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{
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unsigned long flags;
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spin_lock_irqsave(&sync_timeline_list_lock, flags);
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list_add_tail(&obj->sync_timeline_list, &sync_timeline_list_head);
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spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
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}
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void sync_timeline_debug_remove(struct sync_timeline *obj)
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{
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unsigned long flags;
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spin_lock_irqsave(&sync_timeline_list_lock, flags);
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list_del(&obj->sync_timeline_list);
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spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
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}
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void sync_fence_debug_add(struct sync_fence *fence)
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{
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unsigned long flags;
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spin_lock_irqsave(&sync_fence_list_lock, flags);
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list_add_tail(&fence->sync_fence_list, &sync_fence_list_head);
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spin_unlock_irqrestore(&sync_fence_list_lock, flags);
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}
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void sync_fence_debug_remove(struct sync_fence *fence)
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{
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unsigned long flags;
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spin_lock_irqsave(&sync_fence_list_lock, flags);
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list_del(&fence->sync_fence_list);
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spin_unlock_irqrestore(&sync_fence_list_lock, flags);
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}
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static const char *sync_status_str(int status)
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{
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if (status == 0)
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return "signaled";
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else if (status > 0)
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return "active";
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else
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return "error";
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}
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static void sync_print_pt(struct seq_file *s, struct sync_pt *pt, bool fence)
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{
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int status = 1;
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struct sync_timeline *parent = sync_pt_parent(pt);
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if (fence_is_signaled_locked(&pt->base))
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status = pt->base.status;
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seq_printf(s, " %s%spt %s",
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fence ? parent->name : "",
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fence ? "_" : "",
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sync_status_str(status));
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if (status <= 0) {
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struct timeval tv = ktime_to_timeval(pt->base.timestamp);
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seq_printf(s, "@%ld.%06ld", tv.tv_sec, tv.tv_usec);
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}
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if (parent->ops->timeline_value_str &&
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parent->ops->pt_value_str) {
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char value[64];
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parent->ops->pt_value_str(pt, value, sizeof(value));
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seq_printf(s, ": %s", value);
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if (fence) {
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parent->ops->timeline_value_str(parent, value,
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sizeof(value));
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seq_printf(s, " / %s", value);
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}
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}
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seq_puts(s, "\n");
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}
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static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
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{
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struct list_head *pos;
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unsigned long flags;
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seq_printf(s, "%s %s", obj->name, obj->ops->driver_name);
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if (obj->ops->timeline_value_str) {
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char value[64];
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obj->ops->timeline_value_str(obj, value, sizeof(value));
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seq_printf(s, ": %s", value);
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}
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seq_puts(s, "\n");
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spin_lock_irqsave(&obj->child_list_lock, flags);
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list_for_each(pos, &obj->child_list_head) {
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struct sync_pt *pt =
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container_of(pos, struct sync_pt, child_list);
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sync_print_pt(s, pt, false);
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}
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spin_unlock_irqrestore(&obj->child_list_lock, flags);
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}
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static void sync_print_fence(struct seq_file *s, struct sync_fence *fence)
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{
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wait_queue_t *pos;
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unsigned long flags;
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int i;
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seq_printf(s, "[%p] %s: %s\n", fence, fence->name,
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sync_status_str(atomic_read(&fence->status)));
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for (i = 0; i < fence->num_fences; ++i) {
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struct sync_pt *pt =
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container_of(fence->cbs[i].sync_pt,
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struct sync_pt, base);
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sync_print_pt(s, pt, true);
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}
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spin_lock_irqsave(&fence->wq.lock, flags);
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list_for_each_entry(pos, &fence->wq.task_list, task_list) {
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struct sync_fence_waiter *waiter;
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if (pos->func != &sync_fence_wake_up_wq)
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continue;
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waiter = container_of(pos, struct sync_fence_waiter, work);
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seq_printf(s, "waiter %pF\n", waiter->callback);
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}
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spin_unlock_irqrestore(&fence->wq.lock, flags);
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}
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static int sync_debugfs_show(struct seq_file *s, void *unused)
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{
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unsigned long flags;
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struct list_head *pos;
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seq_puts(s, "objs:\n--------------\n");
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spin_lock_irqsave(&sync_timeline_list_lock, flags);
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list_for_each(pos, &sync_timeline_list_head) {
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struct sync_timeline *obj =
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container_of(pos, struct sync_timeline,
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sync_timeline_list);
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sync_print_obj(s, obj);
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seq_puts(s, "\n");
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}
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spin_unlock_irqrestore(&sync_timeline_list_lock, flags);
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seq_puts(s, "fences:\n--------------\n");
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spin_lock_irqsave(&sync_fence_list_lock, flags);
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list_for_each(pos, &sync_fence_list_head) {
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struct sync_fence *fence =
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container_of(pos, struct sync_fence, sync_fence_list);
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sync_print_fence(s, fence);
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seq_puts(s, "\n");
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}
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spin_unlock_irqrestore(&sync_fence_list_lock, flags);
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return 0;
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}
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static int sync_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, sync_debugfs_show, inode->i_private);
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}
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static const struct file_operations sync_debugfs_fops = {
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.open = sync_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static __init int sync_debugfs_init(void)
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{
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debugfs_create_file("sync", S_IRUGO, NULL, NULL, &sync_debugfs_fops);
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return 0;
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}
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late_initcall(sync_debugfs_init);
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#define DUMP_CHUNK 256
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static char sync_dump_buf[64 * 1024];
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void sync_dump(void)
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{
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struct seq_file s = {
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.buf = sync_dump_buf,
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.size = sizeof(sync_dump_buf) - 1,
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};
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int i;
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sync_debugfs_show(&s, NULL);
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for (i = 0; i < s.count; i += DUMP_CHUNK) {
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if ((s.count - i) > DUMP_CHUNK) {
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char c = s.buf[i + DUMP_CHUNK];
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s.buf[i + DUMP_CHUNK] = 0;
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pr_cont("%s", s.buf + i);
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s.buf[i + DUMP_CHUNK] = c;
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} else {
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s.buf[s.count] = 0;
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pr_cont("%s", s.buf + i);
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}
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}
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}
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#endif
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