/** * \file drm_debugfs.c * debugfs support for DRM * * \author Ben Gamari <bgamari@gmail.com> */ /* * Created: Sun Dec 21 13:08:50 2008 by bgamari@gmail.com * * Copyright 2008 Ben Gamari <bgamari@gmail.com> * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. */ #include <linux/debugfs.h>#include <linux/seq_file.h>#include <linux/slab.h>#include <linux/export.h>#include <drm/drmP.h> #if defined(CONFIG_DEBUG_FS) /*************************************************** * Initialization, etc. **************************************************/ static const struct drm_info_list drm_debugfs_list[] = {	{"name", drm_name_info, 0},	{"vm", drm_vm_info, 0},	{"clients", drm_clients_info, 0},	{"bufs", drm_bufs_info, 0},	{"gem_names", drm_gem_name_info, DRIVER_GEM},#if DRM_DEBUG_CODE	{"vma", drm_vma_info, 0},#endif};#define DRM_DEBUGFS_ENTRIES ARRAY_SIZE(drm_debugfs_list)  static int drm_debugfs_open(struct inode *inode, struct file *file){	struct drm_info_node *node = inode->i_private; 	return single_open(file, node->info_ent->show, node);}  static const struct file_operations drm_debugfs_fops = {	.owner = THIS_MODULE,	.open = drm_debugfs_open,	.read = seq_read,	.llseek = seq_lseek,	.release = single_release,};  /** * Initialize a given set of debugfs files for a device * * \param files The array of files to create * \param count The number of files given * \param root DRI debugfs dir entry. * \param minor device minor number * \return Zero on success, non-zero on failure * * Create a given set of debugfs files represented by an array of * gdm_debugfs_lists in the given root directory. */int drm_debugfs_create_files(const struct drm_info_list *files, int count,			     struct dentry *root, struct drm_minor *minor){	struct drm_device *dev = minor->dev;	struct dentry *ent;	struct drm_info_node *tmp;	int i, ret; 	for (i = 0; i < count; i++) {		u32 features = files[i].driver_features; 		if (features != 0 &&		    (dev->driver->driver_features & features) != features)			continue; 		tmp = kmalloc(sizeof(struct drm_info_node), GFP_KERNEL);		if (tmp == NULL) {			ret = -1;			goto fail;		}		ent = debugfs_create_file(files[i].name, S_IFREG | S_IRUGO,					  root, tmp, &drm_debugfs_fops);		if (!ent) {			DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s/%s\n",				  root->d_name.name, files[i].name);			kfree(tmp);			ret = -1;			goto fail;		} 		tmp->minor = minor;		tmp->dent = ent;		tmp->info_ent = &files[i]; 		mutex_lock(&minor->debugfs_lock);		list_add(&tmp->list, &minor->debugfs_list);		mutex_unlock(&minor->debugfs_lock);	}	return 0; fail:	drm_debugfs_remove_files(files, count, minor);	return ret;}EXPORT_SYMBOL(drm_debugfs_create_files); /** * Initialize the DRI debugfs filesystem for a device * * \param dev DRM device * \param minor device minor number * \param root DRI debugfs dir entry. * * Create the DRI debugfs root entry "/sys/kernel/debug/dri", the device debugfs root entry * "/sys/kernel/debug/dri/%minor%/", and each entry in debugfs_list as * "/sys/kernel/debug/dri/%minor%/%name%". */int drm_debugfs_init(struct drm_minor *minor, int minor_id,		     struct dentry *root){	struct drm_device *dev = minor->dev;	char name[64];	int ret; 	INIT_LIST_HEAD(&minor->debugfs_list);	mutex_init(&minor->debugfs_lock);	sprintf(name, "%d", minor_id);	minor->debugfs_root = debugfs_create_dir(name, root);	if (!minor->debugfs_root) {		DRM_ERROR("Cannot create /sys/kernel/debug/dri/%s\n", name);		return -1;	} 	ret = drm_debugfs_create_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES,				       minor->debugfs_root, minor);	if (ret) {		debugfs_remove(minor->debugfs_root);		minor->debugfs_root = NULL;		DRM_ERROR("Failed to create core drm debugfs files\n");		return ret;	} 	if (dev->driver->debugfs_init) {		ret = dev->driver->debugfs_init(minor);		if (ret) {			DRM_ERROR("DRM: Driver failed to initialize "				  "/sys/kernel/debug/dri.\n");			return ret;		}	}	return 0;}  /** * Remove a list of debugfs files * * \param files The list of files * \param count The number of files * \param minor The minor of which we should remove the files * \return always zero. * * Remove all debugfs entries created by debugfs_init(). */int drm_debugfs_remove_files(const struct drm_info_list *files, int count,			     struct drm_minor *minor){	struct list_head *pos, *q;	struct drm_info_node *tmp;	int i; 	mutex_lock(&minor->debugfs_lock);	for (i = 0; i < count; i++) {		list_for_each_safe(pos, q, &minor->debugfs_list) {			tmp = list_entry(pos, struct drm_info_node, list);			if (tmp->info_ent == &files[i]) {				debugfs_remove(tmp->dent);				list_del(pos);				kfree(tmp);			}		}	}	mutex_unlock(&minor->debugfs_lock);	return 0;}EXPORT_SYMBOL(drm_debugfs_remove_files); /** * Cleanup the debugfs filesystem resources. * * \param minor device minor number. * \return always zero. * * Remove all debugfs entries created by debugfs_init(). */int drm_debugfs_cleanup(struct drm_minor *minor){	struct drm_device *dev = minor->dev; 	if (!minor->debugfs_root)		return 0; 	if (dev->driver->debugfs_cleanup)		dev->driver->debugfs_cleanup(minor); 	drm_debugfs_remove_files(drm_debugfs_list, DRM_DEBUGFS_ENTRIES, minor); 	debugfs_remove(minor->debugfs_root);	minor->debugfs_root = NULL; 	return 0;} #endif /* CONFIG_DEBUG_FS */