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![Daniel Vetter](/assets/img/avatar_default.png)
With the prep patches for i915 all kms drivers either have DRM_UNLOCKED on all their ioctls. Or the ioctl always directly returns with an invariant return value when in modeset mode. But that's only the case for i915 and radeon. The drm core ioctls are unfortunately too much a mess still to dare this. Follow-up patches will remove DRM_UNLOCKED from all kms drivers to prove that this is indeed the case. Also update the documentation. v2: Really only do this for driver ioctls, spotted by David Herrmann. And drop spurious whitespace change. Cc: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
817 lines
26 KiB
C
817 lines
26 KiB
C
/*
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* Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Author Rickard E. (Rik) Faith <faith@valinux.com>
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* Author Gareth Hughes <gareth@valinux.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_core.h>
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#include "drm_legacy.h"
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#include "drm_internal.h"
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#include "drm_crtc_internal.h"
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#include <linux/pci.h>
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#include <linux/export.h>
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static int drm_version(struct drm_device *dev, void *data,
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struct drm_file *file_priv);
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/*
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* Get the bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_unique structure.
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* \return zero on success or a negative number on failure.
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*
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* Copies the bus id from drm_device::unique into user space.
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*/
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static int drm_getunique(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_unique *u = data;
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struct drm_master *master = file_priv->master;
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if (u->unique_len >= master->unique_len) {
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if (copy_to_user(u->unique, master->unique, master->unique_len))
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return -EFAULT;
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}
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u->unique_len = master->unique_len;
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return 0;
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}
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static void
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drm_unset_busid(struct drm_device *dev,
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struct drm_master *master)
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{
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kfree(master->unique);
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master->unique = NULL;
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master->unique_len = 0;
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}
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/*
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* Set the bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_unique structure.
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* \return zero on success or a negative number on failure.
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*
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* Copies the bus id from userspace into drm_device::unique, and verifies that
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* it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
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* in interface version 1.1 and will return EBUSY when setversion has requested
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* version 1.1 or greater. Also note that KMS is all version 1.1 and later and
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* UMS was only ever supported on pci devices.
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*/
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static int drm_setunique(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_unique *u = data;
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struct drm_master *master = file_priv->master;
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int ret;
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if (master->unique_len || master->unique)
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return -EBUSY;
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if (!u->unique_len || u->unique_len > 1024)
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return -EINVAL;
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return 0;
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if (WARN_ON(!dev->pdev))
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return -EINVAL;
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ret = drm_pci_set_unique(dev, master, u);
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if (ret)
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goto err;
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return 0;
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err:
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drm_unset_busid(dev, master);
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return ret;
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}
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static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
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{
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struct drm_master *master = file_priv->master;
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int ret;
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if (master->unique != NULL)
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drm_unset_busid(dev, master);
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if (dev->driver->set_busid) {
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ret = dev->driver->set_busid(dev, master);
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if (ret) {
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drm_unset_busid(dev, master);
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return ret;
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}
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} else {
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if (WARN(dev->unique == NULL,
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"No drm_driver.set_busid() implementation provided by "
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"%ps. Use drm_dev_set_unique() to set the unique "
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"name explicitly.", dev->driver))
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return -EINVAL;
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master->unique = kstrdup(dev->unique, GFP_KERNEL);
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if (master->unique)
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master->unique_len = strlen(dev->unique);
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}
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return 0;
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}
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/*
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* Get a mapping information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_map structure.
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*
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* \return zero on success or a negative number on failure.
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*
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* Searches for the mapping with the specified offset and copies its information
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* into userspace
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*/
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static int drm_getmap(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_map *map = data;
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struct drm_map_list *r_list = NULL;
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struct list_head *list;
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int idx;
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int i;
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idx = map->offset;
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if (idx < 0)
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return -EINVAL;
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i = 0;
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mutex_lock(&dev->struct_mutex);
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list_for_each(list, &dev->maplist) {
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if (i == idx) {
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r_list = list_entry(list, struct drm_map_list, head);
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break;
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}
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i++;
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}
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if (!r_list || !r_list->map) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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map->offset = r_list->map->offset;
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map->size = r_list->map->size;
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map->type = r_list->map->type;
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map->flags = r_list->map->flags;
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map->handle = (void *)(unsigned long) r_list->user_token;
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map->mtrr = arch_phys_wc_index(r_list->map->mtrr);
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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/*
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* Get client information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_client structure.
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*
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* \return zero on success or a negative number on failure.
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*
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* Searches for the client with the specified index and copies its information
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* into userspace
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*/
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static int drm_getclient(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_client *client = data;
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/*
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* Hollowed-out getclient ioctl to keep some dead old drm tests/tools
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* not breaking completely. Userspace tools stop enumerating one they
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* get -EINVAL, hence this is the return value we need to hand back for
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* no clients tracked.
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*
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* Unfortunately some clients (*cough* libva *cough*) use this in a fun
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* attempt to figure out whether they're authenticated or not. Since
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* that's the only thing they care about, give it to the directly
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* instead of walking one giant list.
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*/
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if (client->idx == 0) {
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client->auth = file_priv->authenticated;
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client->pid = pid_vnr(file_priv->pid);
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client->uid = from_kuid_munged(current_user_ns(),
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file_priv->uid);
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client->magic = 0;
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client->iocs = 0;
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return 0;
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} else {
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return -EINVAL;
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}
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}
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/*
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* Get statistics information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_stats structure.
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*
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* \return zero on success or a negative number on failure.
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*/
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static int drm_getstats(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_stats *stats = data;
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/* Clear stats to prevent userspace from eating its stack garbage. */
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memset(stats, 0, sizeof(*stats));
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return 0;
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}
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/*
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* Get device/driver capabilities
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*/
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static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_get_cap *req = data;
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req->value = 0;
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switch (req->capability) {
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case DRM_CAP_DUMB_BUFFER:
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if (dev->driver->dumb_create)
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req->value = 1;
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break;
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case DRM_CAP_VBLANK_HIGH_CRTC:
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req->value = 1;
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break;
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case DRM_CAP_DUMB_PREFERRED_DEPTH:
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req->value = dev->mode_config.preferred_depth;
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break;
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case DRM_CAP_DUMB_PREFER_SHADOW:
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req->value = dev->mode_config.prefer_shadow;
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break;
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case DRM_CAP_PRIME:
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req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
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req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
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break;
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case DRM_CAP_TIMESTAMP_MONOTONIC:
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req->value = drm_timestamp_monotonic;
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break;
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case DRM_CAP_ASYNC_PAGE_FLIP:
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req->value = dev->mode_config.async_page_flip;
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break;
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case DRM_CAP_CURSOR_WIDTH:
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if (dev->mode_config.cursor_width)
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req->value = dev->mode_config.cursor_width;
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else
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req->value = 64;
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break;
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case DRM_CAP_CURSOR_HEIGHT:
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if (dev->mode_config.cursor_height)
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req->value = dev->mode_config.cursor_height;
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else
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req->value = 64;
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break;
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case DRM_CAP_ADDFB2_MODIFIERS:
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req->value = dev->mode_config.allow_fb_modifiers;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Set device/driver capabilities
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*/
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static int
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drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_set_client_cap *req = data;
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switch (req->capability) {
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case DRM_CLIENT_CAP_STEREO_3D:
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if (req->value > 1)
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return -EINVAL;
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file_priv->stereo_allowed = req->value;
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break;
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case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
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if (req->value > 1)
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return -EINVAL;
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file_priv->universal_planes = req->value;
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break;
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case DRM_CLIENT_CAP_ATOMIC:
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if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
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return -EINVAL;
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if (req->value > 1)
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return -EINVAL;
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file_priv->atomic = req->value;
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file_priv->universal_planes = req->value;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/*
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* Setversion ioctl.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_lock structure.
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* \return zero on success or negative number on failure.
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*
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* Sets the requested interface version
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*/
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static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_set_version *sv = data;
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int if_version, retcode = 0;
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if (sv->drm_di_major != -1) {
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if (sv->drm_di_major != DRM_IF_MAJOR ||
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sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
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retcode = -EINVAL;
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goto done;
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}
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if_version = DRM_IF_VERSION(sv->drm_di_major,
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sv->drm_di_minor);
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dev->if_version = max(if_version, dev->if_version);
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if (sv->drm_di_minor >= 1) {
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/*
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* Version 1.1 includes tying of DRM to specific device
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* Version 1.4 has proper PCI domain support
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*/
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retcode = drm_set_busid(dev, file_priv);
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if (retcode)
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goto done;
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}
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}
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if (sv->drm_dd_major != -1) {
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if (sv->drm_dd_major != dev->driver->major ||
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sv->drm_dd_minor < 0 || sv->drm_dd_minor >
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dev->driver->minor) {
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retcode = -EINVAL;
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goto done;
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}
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}
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done:
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sv->drm_di_major = DRM_IF_MAJOR;
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sv->drm_di_minor = DRM_IF_MINOR;
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sv->drm_dd_major = dev->driver->major;
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sv->drm_dd_minor = dev->driver->minor;
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return retcode;
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}
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/**
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* drm_noop - DRM no-op ioctl implemntation
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* @dev: DRM device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: DRM file for the ioctl call
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*
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* This no-op implementation for drm ioctls is useful for deprecated
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* functionality where we can't return a failure code because existing userspace
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* checks the result of the ioctl, but doesn't care about the action.
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*
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* Always returns successfully with 0.
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*/
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int drm_noop(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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DRM_DEBUG("\n");
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return 0;
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}
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EXPORT_SYMBOL(drm_noop);
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/**
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* drm_invalid_op - DRM invalid ioctl implemntation
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* @dev: DRM device for the ioctl
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* @data: data pointer for the ioctl
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* @file_priv: DRM file for the ioctl call
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*
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* This no-op implementation for drm ioctls is useful for deprecated
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* functionality where we really don't want to allow userspace to call the ioctl
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* any more. This is the case for old ums interfaces for drivers that
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* transitioned to kms gradually and so kept the old legacy tables around. This
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* only applies to radeon and i915 kms drivers, other drivers shouldn't need to
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* use this function.
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*
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* Always fails with a return value of -EINVAL.
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*/
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int drm_invalid_op(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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return -EINVAL;
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}
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EXPORT_SYMBOL(drm_invalid_op);
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/*
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* Copy and IOCTL return string to user space
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*/
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static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
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{
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int len;
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/* don't overflow userbuf */
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len = strlen(value);
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if (len > *buf_len)
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len = *buf_len;
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/* let userspace know exact length of driver value (which could be
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* larger than the userspace-supplied buffer) */
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*buf_len = strlen(value);
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/* finally, try filling in the userbuf */
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if (len && buf)
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if (copy_to_user(buf, value, len))
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return -EFAULT;
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return 0;
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}
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/*
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* Get version information
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*
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* \param inode device inode.
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* \param filp file pointer.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_version structure.
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* \return zero on success or negative number on failure.
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*
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* Fills in the version information in \p arg.
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*/
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static int drm_version(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_version *version = data;
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int err;
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version->version_major = dev->driver->major;
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version->version_minor = dev->driver->minor;
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version->version_patchlevel = dev->driver->patchlevel;
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err = drm_copy_field(version->name, &version->name_len,
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dev->driver->name);
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if (!err)
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err = drm_copy_field(version->date, &version->date_len,
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dev->driver->date);
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if (!err)
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err = drm_copy_field(version->desc, &version->desc_len,
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dev->driver->desc);
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return err;
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}
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/*
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* drm_ioctl_permit - Check ioctl permissions against caller
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*
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* @flags: ioctl permission flags.
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* @file_priv: Pointer to struct drm_file identifying the caller.
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*
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* Checks whether the caller is allowed to run an ioctl with the
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* indicated permissions. If so, returns zero. Otherwise returns an
|
|
* error code suitable for ioctl return.
|
|
*/
|
|
int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
|
|
{
|
|
/* ROOT_ONLY is only for CAP_SYS_ADMIN */
|
|
if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
|
|
return -EACCES;
|
|
|
|
/* AUTH is only for authenticated or render client */
|
|
if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
|
|
!file_priv->authenticated))
|
|
return -EACCES;
|
|
|
|
/* MASTER is only for master or control clients */
|
|
if (unlikely((flags & DRM_MASTER) && !file_priv->is_master &&
|
|
!drm_is_control_client(file_priv)))
|
|
return -EACCES;
|
|
|
|
/* Control clients must be explicitly allowed */
|
|
if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
|
|
drm_is_control_client(file_priv)))
|
|
return -EACCES;
|
|
|
|
/* Render clients must be explicitly allowed */
|
|
if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
|
|
drm_is_render_client(file_priv)))
|
|
return -EACCES;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_ioctl_permit);
|
|
|
|
#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
|
|
[DRM_IOCTL_NR(ioctl)] = { \
|
|
.cmd = ioctl, \
|
|
.func = _func, \
|
|
.flags = _flags, \
|
|
.name = #ioctl \
|
|
}
|
|
|
|
/* Ioctl table */
|
|
static const struct drm_ioctl_desc drm_ioctls[] = {
|
|
DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
|
|
DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_getmap, DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_setunique, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_MASTER),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_ROOT_ONLY),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
|
|
#if IS_ENABLED(CONFIG_AGP)
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
#endif
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
|
|
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
|
|
};
|
|
|
|
#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
|
|
|
|
/**
|
|
* drm_ioctl - ioctl callback implementation for DRM drivers
|
|
* @filp: file this ioctl is called on
|
|
* @cmd: ioctl cmd number
|
|
* @arg: user argument
|
|
*
|
|
* Looks up the ioctl function in the ::ioctls table, checking for root
|
|
* previleges if so required, and dispatches to the respective function.
|
|
*
|
|
* Returns:
|
|
* Zero on success, negative error code on failure.
|
|
*/
|
|
long drm_ioctl(struct file *filp,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct drm_file *file_priv = filp->private_data;
|
|
struct drm_device *dev;
|
|
const struct drm_ioctl_desc *ioctl = NULL;
|
|
drm_ioctl_t *func;
|
|
unsigned int nr = DRM_IOCTL_NR(cmd);
|
|
int retcode = -EINVAL;
|
|
char stack_kdata[128];
|
|
char *kdata = NULL;
|
|
unsigned int usize, asize, drv_size;
|
|
bool is_driver_ioctl;
|
|
|
|
dev = file_priv->minor->dev;
|
|
|
|
if (drm_device_is_unplugged(dev))
|
|
return -ENODEV;
|
|
|
|
is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
|
|
|
|
if (is_driver_ioctl) {
|
|
/* driver ioctl */
|
|
if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
|
|
goto err_i1;
|
|
ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
|
|
} else {
|
|
/* core ioctl */
|
|
if (nr >= DRM_CORE_IOCTL_COUNT)
|
|
goto err_i1;
|
|
ioctl = &drm_ioctls[nr];
|
|
}
|
|
|
|
drv_size = _IOC_SIZE(ioctl->cmd);
|
|
usize = _IOC_SIZE(cmd);
|
|
asize = max(usize, drv_size);
|
|
cmd = ioctl->cmd;
|
|
|
|
DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
|
|
task_pid_nr(current),
|
|
(long)old_encode_dev(file_priv->minor->kdev->devt),
|
|
file_priv->authenticated, ioctl->name);
|
|
|
|
/* Do not trust userspace, use our own definition */
|
|
func = ioctl->func;
|
|
|
|
if (unlikely(!func)) {
|
|
DRM_DEBUG("no function\n");
|
|
retcode = -EINVAL;
|
|
goto err_i1;
|
|
}
|
|
|
|
retcode = drm_ioctl_permit(ioctl->flags, file_priv);
|
|
if (unlikely(retcode))
|
|
goto err_i1;
|
|
|
|
if (cmd & (IOC_IN | IOC_OUT)) {
|
|
if (asize <= sizeof(stack_kdata)) {
|
|
kdata = stack_kdata;
|
|
} else {
|
|
kdata = kmalloc(asize, GFP_KERNEL);
|
|
if (!kdata) {
|
|
retcode = -ENOMEM;
|
|
goto err_i1;
|
|
}
|
|
}
|
|
if (asize > usize)
|
|
memset(kdata + usize, 0, asize - usize);
|
|
}
|
|
|
|
if (cmd & IOC_IN) {
|
|
if (copy_from_user(kdata, (void __user *)arg,
|
|
usize) != 0) {
|
|
retcode = -EFAULT;
|
|
goto err_i1;
|
|
}
|
|
} else if (cmd & IOC_OUT) {
|
|
memset(kdata, 0, usize);
|
|
}
|
|
|
|
/* Enforce sane locking for kms driver ioctls. Core ioctls are
|
|
* too messy still. */
|
|
if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) ||
|
|
(ioctl->flags & DRM_UNLOCKED))
|
|
retcode = func(dev, kdata, file_priv);
|
|
else {
|
|
mutex_lock(&drm_global_mutex);
|
|
retcode = func(dev, kdata, file_priv);
|
|
mutex_unlock(&drm_global_mutex);
|
|
}
|
|
|
|
if (cmd & IOC_OUT) {
|
|
if (copy_to_user((void __user *)arg, kdata,
|
|
usize) != 0)
|
|
retcode = -EFAULT;
|
|
}
|
|
|
|
err_i1:
|
|
if (!ioctl)
|
|
DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
|
|
task_pid_nr(current),
|
|
(long)old_encode_dev(file_priv->minor->kdev->devt),
|
|
file_priv->authenticated, cmd, nr);
|
|
|
|
if (kdata != stack_kdata)
|
|
kfree(kdata);
|
|
if (retcode)
|
|
DRM_DEBUG("ret = %d\n", retcode);
|
|
return retcode;
|
|
}
|
|
EXPORT_SYMBOL(drm_ioctl);
|
|
|
|
/**
|
|
* drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
|
|
* @nr: ioctl number
|
|
* @flags: where to return the ioctl permission flags
|
|
*
|
|
* This ioctl is only used by the vmwgfx driver to augment the access checks
|
|
* done by the drm core and insofar a pretty decent layering violation. This
|
|
* shouldn't be used by any drivers.
|
|
*
|
|
* Returns:
|
|
* True if the @nr corresponds to a DRM core ioctl numer, false otherwise.
|
|
*/
|
|
bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
|
|
{
|
|
if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
|
|
return false;
|
|
|
|
if (nr >= DRM_CORE_IOCTL_COUNT)
|
|
return false;
|
|
|
|
*flags = drm_ioctls[nr].flags;
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(drm_ioctl_flags);
|