// 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); 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);} 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);	} 	seq_printf(s, ": %lld", fence->seqno);	seq_printf(s, " / %d", parent->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(&obj->lock); /* Caller already disabled IRQ. */	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(&obj->lock);} 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"); 	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);