/* * Sync File validation framework and debug information * * 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 "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 "signaled"; 	if (status > 0)		return "active"; 	return "error";} static void sync_print_fence(struct seq_file *s, struct fence *fence, bool show){	int status = 1;	struct sync_timeline *parent = fence_parent(fence); 	if (fence_is_signaled_locked(fence))		status = fence->status; 	seq_printf(s, "  %s%sfence %s",		   show ? parent->name : "",		   show ? "_" : "",		   sync_status_str(status)); 	if (status <= 0) {		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_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: %d\n", obj->name, obj->value); 	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_fence(s, &pt->base, false);	}	spin_unlock_irqrestore(&obj->child_list_lock, flags);} static void sync_print_sync_file(struct seq_file *s,				  struct sync_file *sync_file){	int i; 	seq_printf(s, "[%p] %s: %s\n", sync_file, sync_file->name,		   sync_status_str(!fence_is_signaled(sync_file->fence))); 	if (fence_is_array(sync_file->fence)) {		struct fence_array *array = to_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_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_file_list_lock, flags);	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_puts(s, "\n");	}	spin_unlock_irqrestore(&sync_file_list_lock, flags);	return 0;} static int sync_info_debugfs_open(struct inode *inode, struct file *file){	return single_open(file, sync_debugfs_show, inode->i_private);} static const struct file_operations sync_info_debugfs_fops = {	.open           = sync_info_debugfs_open,	.read           = seq_read,	.llseek         = seq_lseek,	.release        = single_release,}; 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); #define DUMP_CHUNK 256static 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);		}	}}