/**
* \file drm_proc.c
* /proc support for DRM
*
* \author Rickard E. (Rik) Faith <faith@valinux.com>
* \author Gareth Hughes <gareth@valinux.com>
*
* \par Acknowledgements:
* Matthew J Sottek <matthew.j.sottek@intel.com> sent in a patch to fix
* the problem with the proc files not outputting all their information.
*/
/*
* Created: Mon Jan 11 09:48:47 1999 by faith@valinux.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* 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/seq_file.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <drm/drmP.h>
/***************************************************
* Initialization, etc.
**************************************************/
/**
* Proc file list.
*/
static struct drm_info_list drm_proc_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_PROC_ENTRIES ARRAY_SIZE(drm_proc_list)
static int drm_proc_open(struct inode *inode, struct file *file)
{
struct drm_info_node* node = PDE(inode)->data;
return single_open(file, node->info_ent->show, node);
}
static const struct file_operations drm_proc_fops = {
.owner = THIS_MODULE,
.open = drm_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/**
* Initialize a given set of proc files for a device
*
* \param files The array of files to create
* \param count The number of files given
* \param root DRI proc dir entry.
* \param minor device minor number
* \return Zero on success, non-zero on failure
*
* Create a given set of proc files represented by an array of
* gdm_proc_lists in the given root directory.
*/
static int drm_proc_create_files(struct drm_info_list *files, int count,
struct proc_dir_entry *root, struct drm_minor *minor)
{
struct drm_device *dev = minor->dev;
struct proc_dir_entry *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;
}
tmp->minor = minor;
tmp->info_ent = &files[i];
list_add(&tmp->list, &minor->proc_nodes.list);
ent = proc_create_data(files[i].name, S_IRUGO, root,
&drm_proc_fops, tmp);
if (!ent) {
DRM_ERROR("Cannot create /proc/dri/%s/%s\n",
root->name, files[i].name);
list_del(&tmp->list);
kfree(tmp);
ret = -1;
goto fail;
}
}
return 0;
fail:
for (i = 0; i < count; i++)
remove_proc_entry(drm_proc_list[i].name, minor->proc_root);
return ret;
}
/**
* Initialize the DRI proc filesystem for a device
*
* \param dev DRM device
* \param minor device minor number
* \param root DRI proc dir entry.
* \param dev_root resulting DRI device proc dir entry.
* \return root entry pointer on success, or NULL on failure.
*
* Create the DRI proc root entry "/proc/dri", the device proc root entry
* "/proc/dri/%minor%/", and each entry in proc_list as
* "/proc/dri/%minor%/%name%".
*/
int drm_proc_init(struct drm_minor *minor, int minor_id,
struct proc_dir_entry *root)
{
char name[64];
int ret;
INIT_LIST_HEAD(&minor->proc_nodes.list);
sprintf(name, "%d", minor_id);
minor->proc_root = proc_mkdir(name, root);
if (!minor->proc_root) {
DRM_ERROR("Cannot create /proc/dri/%s\n", name);
return -1;
}
ret = drm_proc_create_files(drm_proc_list, DRM_PROC_ENTRIES,
minor->proc_root, minor);
if (ret) {
remove_proc_entry(name, root);
minor->proc_root = NULL;
DRM_ERROR("Failed to create core drm proc files\n");
return ret;
}
return 0;
}
static int drm_proc_remove_files(struct drm_info_list *files, int count,
struct drm_minor *minor)
{
struct list_head *pos, *q;
struct drm_info_node *tmp;
int i;
for (i = 0; i < count; i++) {
list_for_each_safe(pos, q, &minor->proc_nodes.list) {
tmp = list_entry(pos, struct drm_info_node, list);
if (tmp->info_ent == &files[i]) {
remove_proc_entry(files[i].name,
minor->proc_root);
list_del(pos);
kfree(tmp);
}
}
}
return 0;
}
/**
* Cleanup the proc filesystem resources.
*
* \param minor device minor number.
* \param root DRI proc dir entry.
* \param dev_root DRI device proc dir entry.
* \return always zero.
*
* Remove all proc entries created by proc_init().
*/
int drm_proc_cleanup(struct drm_minor *minor, struct proc_dir_entry *root)
{
char name[64];
if (!root || !minor->proc_root)
return 0;
drm_proc_remove_files(drm_proc_list, DRM_PROC_ENTRIES, minor);
sprintf(name, "%d", minor->index);
remove_proc_entry(name, root);
return 0;
}
