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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Sync File validation framework and debug information
- *
- * Copyright (C) 2012 Google, Inc.
- */
- #include <linux/debugfs.h>
- #include "sync_debug.h"
- static struct dentry *dbgfs;
- static LIST_HEAD(sync_timeline_list_head);
- static DEFINE_SPINLOCK(sync_timeline_list_lock);
- static LIST_HEAD(sync_file_list_head);
- static DEFINE_SPINLOCK(sync_file_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_file_debug_add(struct sync_file *sync_file)
- {
- unsigned long flags;
- spin_lock_irqsave(&sync_file_list_lock, flags);
- list_add_tail(&sync_file->sync_file_list, &sync_file_list_head);
- spin_unlock_irqrestore(&sync_file_list_lock, flags);
- }
- void sync_file_debug_remove(struct sync_file *sync_file)
- {
- unsigned long flags;
- spin_lock_irqsave(&sync_file_list_lock, flags);
- list_del(&sync_file->sync_file_list);
- spin_unlock_irqrestore(&sync_file_list_lock, flags);
- }
- static const char *sync_status_str(int status)
- {
- if (status < 0)
- return "error";
- if (status > 0)
- return "signaled";
- return "active";
- }
- static void sync_print_fence(struct seq_file *s,
- struct dma_fence *fence, bool show)
- {
- struct sync_timeline *parent = dma_fence_parent(fence);
- int status;
- status = dma_fence_get_status_locked(fence);
- seq_printf(s, " %s%sfence %s",
- show ? parent->name : "",
- show ? "_" : "",
- sync_status_str(status));
- if (test_bit(DMA_FENCE_FLAG_TIMESTAMP_BIT, &fence->flags)) {
- struct timespec64 ts64 =
- ktime_to_timespec64(fence->timestamp);
- seq_printf(s, "@%lld.%09ld", (s64)ts64.tv_sec, ts64.tv_nsec);
- }
- if (fence->ops->timeline_value_str &&
- fence->ops->fence_value_str) {
- char value[64];
- bool success;
- fence->ops->fence_value_str(fence, value, sizeof(value));
- success = strlen(value);
- if (success) {
- seq_printf(s, ": %s", value);
- fence->ops->timeline_value_str(fence, value,
- sizeof(value));
- if (strlen(value))
- seq_printf(s, " / %s", value);
- }
- }
- seq_putc(s, '\n');
- }
- static void sync_print_obj(struct seq_file *s, struct sync_timeline *obj)
- {
- struct list_head *pos;
- seq_printf(s, "%s: %d\n", obj->name, obj->value);
- spin_lock_irq(&obj->lock);
- list_for_each(pos, &obj->pt_list) {
- struct sync_pt *pt = container_of(pos, struct sync_pt, link);
- sync_print_fence(s, &pt->base, false);
- }
- spin_unlock_irq(&obj->lock);
- }
- static void sync_print_sync_file(struct seq_file *s,
- struct sync_file *sync_file)
- {
- char buf[128];
- int i;
- seq_printf(s, "[%p] %s: %s\n", sync_file,
- sync_file_get_name(sync_file, buf, sizeof(buf)),
- sync_status_str(dma_fence_get_status(sync_file->fence)));
- if (dma_fence_is_array(sync_file->fence)) {
- struct dma_fence_array *array = to_dma_fence_array(sync_file->fence);
- for (i = 0; i < array->num_fences; ++i)
- sync_print_fence(s, array->fences[i], true);
- } else {
- sync_print_fence(s, sync_file->fence, true);
- }
- }
- static int sync_info_debugfs_show(struct seq_file *s, void *unused)
- {
- struct list_head *pos;
- seq_puts(s, "objs:\n--------------\n");
- spin_lock_irq(&sync_timeline_list_lock);
- 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_putc(s, '\n');
- }
- spin_unlock_irq(&sync_timeline_list_lock);
- seq_puts(s, "fences:\n--------------\n");
- spin_lock_irq(&sync_file_list_lock);
- list_for_each(pos, &sync_file_list_head) {
- struct sync_file *sync_file =
- container_of(pos, struct sync_file, sync_file_list);
- sync_print_sync_file(s, sync_file);
- seq_putc(s, '\n');
- }
- spin_unlock_irq(&sync_file_list_lock);
- return 0;
- }
- DEFINE_SHOW_ATTRIBUTE(sync_info_debugfs);
- static __init int sync_debugfs_init(void)
- {
- dbgfs = debugfs_create_dir("sync", NULL);
- /*
- * The debugfs files won't ever get removed and thus, there is
- * no need to protect it against removal races. The use of
- * debugfs_create_file_unsafe() is actually safe here.
- */
- debugfs_create_file_unsafe("info", 0444, dbgfs, NULL,
- &sync_info_debugfs_fops);
- debugfs_create_file_unsafe("sw_sync", 0644, dbgfs, NULL,
- &sw_sync_debugfs_fops);
- return 0;
- }
- late_initcall(sync_debugfs_init);
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