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linuxdebug/drivers/gpu/drm/drm_ioctl.c

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2024-07-16 15:50:57 +02:00
/*
* Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
*
* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
* All Rights Reserved.
*
* Author Rickard E. (Rik) Faith <faith@valinux.com>
* Author Gareth Hughes <gareth@valinux.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/export.h>
#include <linux/nospec.h>
#include <linux/pci.h>
#include <linux/uaccess.h>
#include <drm/drm_auth.h>
#include <drm/drm_crtc.h>
#include <drm/drm_drv.h>
#include <drm/drm_file.h>
#include <drm/drm_ioctl.h>
#include <drm/drm_print.h>
#include "drm_crtc_internal.h"
#include "drm_internal.h"
#include "drm_legacy.h"
/**
* DOC: getunique and setversion story
*
* BEWARE THE DRAGONS! MIND THE TRAPDOORS!
*
* In an attempt to warn anyone else who's trying to figure out what's going
* on here, I'll try to summarize the story. First things first, let's clear up
* the names, because the kernel internals, libdrm and the ioctls are all named
* differently:
*
* - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
* through the drmGetBusid function.
* - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
* that code is nerved in the kernel with drm_invalid_op().
* - The internal set_busid kernel functions and driver callbacks are
* exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
* nerved) allowed userspace to set the busid through the above ioctl.
* - Other ioctls and functions involved are named consistently.
*
* For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
* handling pci domains in the busid on ppc. Doing this correctly was only
* implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
* special with drm 1.2 and 1.3.
*
* Now the actual horror story of how device lookup in drm works. At large,
* there's 2 different ways, either by busid, or by device driver name.
*
* Opening by busid is fairly simple:
*
* 1. First call SET_VERSION to make sure pci domains are handled properly. As a
* side-effect this fills out the unique name in the master structure.
* 2. Call GET_UNIQUE to read out the unique name from the master structure,
* which matches the busid thanks to step 1. If it doesn't, proceed to try
* the next device node.
*
* Opening by name is slightly different:
*
* 1. Directly call VERSION to get the version and to match against the driver
* name returned by that ioctl. Note that SET_VERSION is not called, which
* means the unique name for the master node just opening is _not_ filled
* out. This despite that with current drm device nodes are always bound to
* one device, and can't be runtime assigned like with drm 1.0.
* 2. Match driver name. If it mismatches, proceed to the next device node.
* 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
* checking that the first byte in the string is 0). If that's not the case
* libdrm skips and proceeds to the next device node. Probably this is just
* copypasta from drm 1.0 times where a set unique name meant that the driver
* was in use already, but that's just conjecture.
*
* Long story short: To keep the open by name logic working, GET_UNIQUE must
* _not_ return a unique string when SET_VERSION hasn't been called yet,
* otherwise libdrm breaks. Even when that unique string can't ever change, and
* is totally irrelevant for actually opening the device because runtime
* assignable device instances were only support in drm 1.0, which is long dead.
* But the libdrm code in drmOpenByName somehow survived, hence this can't be
* broken.
*/
/*
* Get the bus id.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_unique structure.
* \return zero on success or a negative number on failure.
*
* Copies the bus id from drm_device::unique into user space.
*/
int drm_getunique(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_unique *u = data;
struct drm_master *master;
mutex_lock(&dev->master_mutex);
master = file_priv->master;
if (u->unique_len >= master->unique_len) {
if (copy_to_user(u->unique, master->unique, master->unique_len)) {
mutex_unlock(&dev->master_mutex);
return -EFAULT;
}
}
u->unique_len = master->unique_len;
mutex_unlock(&dev->master_mutex);
return 0;
}
static void
drm_unset_busid(struct drm_device *dev,
struct drm_master *master)
{
kfree(master->unique);
master->unique = NULL;
master->unique_len = 0;
}
static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
{
struct drm_master *master = file_priv->master;
int ret;
if (master->unique != NULL)
drm_unset_busid(dev, master);
if (dev->dev && dev_is_pci(dev->dev)) {
ret = drm_pci_set_busid(dev, master);
if (ret) {
drm_unset_busid(dev, master);
return ret;
}
} else {
WARN_ON(!dev->unique);
master->unique = kstrdup(dev->unique, GFP_KERNEL);
if (master->unique)
master->unique_len = strlen(dev->unique);
}
return 0;
}
/*
* Get client information.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_client structure.
*
* \return zero on success or a negative number on failure.
*
* Searches for the client with the specified index and copies its information
* into userspace
*/
int drm_getclient(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_client *client = data;
/*
* Hollowed-out getclient ioctl to keep some dead old drm tests/tools
* not breaking completely. Userspace tools stop enumerating one they
* get -EINVAL, hence this is the return value we need to hand back for
* no clients tracked.
*
* Unfortunately some clients (*cough* libva *cough*) use this in a fun
* attempt to figure out whether they're authenticated or not. Since
* that's the only thing they care about, give it to the directly
* instead of walking one giant list.
*/
if (client->idx == 0) {
client->auth = file_priv->authenticated;
client->pid = task_pid_vnr(current);
client->uid = overflowuid;
client->magic = 0;
client->iocs = 0;
return 0;
} else {
return -EINVAL;
}
}
/*
* Get statistics information.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_stats structure.
*
* \return zero on success or a negative number on failure.
*/
static int drm_getstats(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_stats *stats = data;
/* Clear stats to prevent userspace from eating its stack garbage. */
memset(stats, 0, sizeof(*stats));
return 0;
}
/*
* Get device/driver capabilities
*/
static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_get_cap *req = data;
struct drm_crtc *crtc;
req->value = 0;
/* Only some caps make sense with UMS/render-only drivers. */
switch (req->capability) {
case DRM_CAP_TIMESTAMP_MONOTONIC:
req->value = 1;
return 0;
case DRM_CAP_PRIME:
req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
return 0;
case DRM_CAP_SYNCOBJ:
req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);
return 0;
case DRM_CAP_SYNCOBJ_TIMELINE:
req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);
return 0;
}
/* Other caps only work with KMS drivers */
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
switch (req->capability) {
case DRM_CAP_DUMB_BUFFER:
if (dev->driver->dumb_create)
req->value = 1;
break;
case DRM_CAP_VBLANK_HIGH_CRTC:
req->value = 1;
break;
case DRM_CAP_DUMB_PREFERRED_DEPTH:
req->value = dev->mode_config.preferred_depth;
break;
case DRM_CAP_DUMB_PREFER_SHADOW:
req->value = dev->mode_config.prefer_shadow;
break;
case DRM_CAP_ASYNC_PAGE_FLIP:
req->value = dev->mode_config.async_page_flip;
break;
case DRM_CAP_PAGE_FLIP_TARGET:
req->value = 1;
drm_for_each_crtc(crtc, dev) {
if (!crtc->funcs->page_flip_target)
req->value = 0;
}
break;
case DRM_CAP_CURSOR_WIDTH:
if (dev->mode_config.cursor_width)
req->value = dev->mode_config.cursor_width;
else
req->value = 64;
break;
case DRM_CAP_CURSOR_HEIGHT:
if (dev->mode_config.cursor_height)
req->value = dev->mode_config.cursor_height;
else
req->value = 64;
break;
case DRM_CAP_ADDFB2_MODIFIERS:
req->value = !dev->mode_config.fb_modifiers_not_supported;
break;
case DRM_CAP_CRTC_IN_VBLANK_EVENT:
req->value = 1;
break;
default:
return -EINVAL;
}
return 0;
}
/*
* Set device/driver capabilities
*/
static int
drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_set_client_cap *req = data;
/* No render-only settable capabilities for now */
/* Below caps that only works with KMS drivers */
if (!drm_core_check_feature(dev, DRIVER_MODESET))
return -EOPNOTSUPP;
switch (req->capability) {
case DRM_CLIENT_CAP_STEREO_3D:
if (req->value > 1)
return -EINVAL;
file_priv->stereo_allowed = req->value;
break;
case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
if (req->value > 1)
return -EINVAL;
file_priv->universal_planes = req->value;
break;
case DRM_CLIENT_CAP_ATOMIC:
if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
return -EOPNOTSUPP;
/* The modesetting DDX has a totally broken idea of atomic. */
if (current->comm[0] == 'X' && req->value == 1) {
pr_info("broken atomic modeset userspace detected, disabling atomic\n");
return -EOPNOTSUPP;
}
if (req->value > 2)
return -EINVAL;
file_priv->atomic = req->value;
file_priv->universal_planes = req->value;
/*
* No atomic user-space blows up on aspect ratio mode bits.
*/
file_priv->aspect_ratio_allowed = req->value;
break;
case DRM_CLIENT_CAP_ASPECT_RATIO:
if (req->value > 1)
return -EINVAL;
file_priv->aspect_ratio_allowed = req->value;
break;
case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS:
if (!file_priv->atomic)
return -EINVAL;
if (req->value > 1)
return -EINVAL;
file_priv->writeback_connectors = req->value;
break;
default:
return -EINVAL;
}
return 0;
}
/*
* Setversion ioctl.
*
* \param inode device inode.
* \param file_priv DRM file private.
* \param cmd command.
* \param arg user argument, pointing to a drm_lock structure.
* \return zero on success or negative number on failure.
*
* Sets the requested interface version
*/
static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_set_version *sv = data;
int if_version, retcode = 0;
mutex_lock(&dev->master_mutex);
if (sv->drm_di_major != -1) {
if (sv->drm_di_major != DRM_IF_MAJOR ||
sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
retcode = -EINVAL;
goto done;
}
if_version = DRM_IF_VERSION(sv->drm_di_major,
sv->drm_di_minor);
dev->if_version = max(if_version, dev->if_version);
if (sv->drm_di_minor >= 1) {
/*
* Version 1.1 includes tying of DRM to specific device
* Version 1.4 has proper PCI domain support
*/
retcode = drm_set_busid(dev, file_priv);
if (retcode)
goto done;
}
}
if (sv->drm_dd_major != -1) {
if (sv->drm_dd_major != dev->driver->major ||
sv->drm_dd_minor < 0 || sv->drm_dd_minor >
dev->driver->minor) {
retcode = -EINVAL;
goto done;
}
}
done:
sv->drm_di_major = DRM_IF_MAJOR;
sv->drm_di_minor = DRM_IF_MINOR;
sv->drm_dd_major = dev->driver->major;
sv->drm_dd_minor = dev->driver->minor;
mutex_unlock(&dev->master_mutex);
return retcode;
}
/**
* drm_noop - DRM no-op ioctl implementation
* @dev: DRM device for the ioctl
* @data: data pointer for the ioctl
* @file_priv: DRM file for the ioctl call
*
* This no-op implementation for drm ioctls is useful for deprecated
* functionality where we can't return a failure code because existing userspace
* checks the result of the ioctl, but doesn't care about the action.
*
* Always returns successfully with 0.
*/
int drm_noop(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
DRM_DEBUG("\n");
return 0;
}
EXPORT_SYMBOL(drm_noop);
/**
* drm_invalid_op - DRM invalid ioctl implementation
* @dev: DRM device for the ioctl
* @data: data pointer for the ioctl
* @file_priv: DRM file for the ioctl call
*
* This no-op implementation for drm ioctls is useful for deprecated
* functionality where we really don't want to allow userspace to call the ioctl
* any more. This is the case for old ums interfaces for drivers that
* transitioned to kms gradually and so kept the old legacy tables around. This
* only applies to radeon and i915 kms drivers, other drivers shouldn't need to
* use this function.
*
* Always fails with a return value of -EINVAL.
*/
int drm_invalid_op(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
return -EINVAL;
}
EXPORT_SYMBOL(drm_invalid_op);
/*
* Copy and IOCTL return string to user space
*/
static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
{
size_t len;
/* don't attempt to copy a NULL pointer */
if (WARN_ONCE(!value, "BUG: the value to copy was not set!")) {
*buf_len = 0;
return 0;
}
/* don't overflow userbuf */
len = strlen(value);
if (len > *buf_len)
len = *buf_len;
/* let userspace know exact length of driver value (which could be
* larger than the userspace-supplied buffer) */
*buf_len = strlen(value);
/* finally, try filling in the userbuf */
if (len && buf)
if (copy_to_user(buf, value, len))
return -EFAULT;
return 0;
}
/*
* Get version information
*
* \param inode device inode.
* \param filp file pointer.
* \param cmd command.
* \param arg user argument, pointing to a drm_version structure.
* \return zero on success or negative number on failure.
*
* Fills in the version information in \p arg.
*/
int drm_version(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_version *version = data;
int err;
version->version_major = dev->driver->major;
version->version_minor = dev->driver->minor;
version->version_patchlevel = dev->driver->patchlevel;
err = drm_copy_field(version->name, &version->name_len,
dev->driver->name);
if (!err)
err = drm_copy_field(version->date, &version->date_len,
dev->driver->date);
if (!err)
err = drm_copy_field(version->desc, &version->desc_len,
dev->driver->desc);
return err;
}
static 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) &&
!drm_is_current_master(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;
}
#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
[DRM_IOCTL_NR(ioctl)] = { \
.cmd = ioctl, \
.func = _func, \
.flags = _flags, \
.name = #ioctl \
}
#if IS_ENABLED(CONFIG_DRM_LEGACY)
#define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags)
#else
#define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags)
#endif
/* Ioctl table */
static const struct drm_ioctl_desc drm_ioctls[] = {
DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_legacy_irq_by_busid,
DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, 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_invalid_op, 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_MASTER),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, 0),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_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_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
#if IS_ENABLED(CONFIG_AGP)
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_legacy_agp_acquire_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_legacy_agp_release_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_legacy_agp_enable_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_legacy_agp_info_ioctl, DRM_AUTH),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_legacy_agp_alloc_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_legacy_agp_free_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_legacy_agp_bind_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_legacy_agp_unbind_ioctl,
DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
#endif
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
DRM_LEGACY_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_ioctl, DRM_UNLOCKED),
DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 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_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0),
DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB2, drm_mode_getfb2_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl,
DRM_RENDER_ALLOW),
DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER),
DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER),
};
#define DRM_CORE_IOCTL_COUNT ARRAY_SIZE(drm_ioctls)
/**
* DOC: driver specific ioctls
*
* First things first, driver private IOCTLs should only be needed for drivers
* supporting rendering. Kernel modesetting is all standardized, and extended
* through properties. There are a few exceptions in some existing drivers,
* which define IOCTL for use by the display DRM master, but they all predate
* properties.
*
* Now if you do have a render driver you always have to support it through
* driver private properties. There's a few steps needed to wire all the things
* up.
*
* First you need to define the structure for your IOCTL in your driver private
* UAPI header in ``include/uapi/drm/my_driver_drm.h``::
*
* struct my_driver_operation {
* u32 some_thing;
* u32 another_thing;
* };
*
* Please make sure that you follow all the best practices from
* ``Documentation/process/botching-up-ioctls.rst``. Note that drm_ioctl()
* automatically zero-extends structures, hence make sure you can add more stuff
* at the end, i.e. don't put a variable sized array there.
*
* Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
* DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
*
* ##define DRM_IOCTL_MY_DRIVER_OPERATION \
* DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
*
* DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
* DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
* up the handlers and set the access rights::
*
* static const struct drm_ioctl_desc my_driver_ioctls[] = {
* DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
* DRM_AUTH|DRM_RENDER_ALLOW),
* };
*
* And then assign this to the &drm_driver.ioctls field in your driver
* structure.
*
* See the separate chapter on :ref:`file operations<drm_driver_fops>` for how
* the driver-specific IOCTLs are wired up.
*/
long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
u32 flags)
{
struct drm_file *file_priv = file->private_data;
struct drm_device *dev = file_priv->minor->dev;
int retcode;
if (drm_dev_is_unplugged(dev))
return -ENODEV;
retcode = drm_ioctl_permit(flags, file_priv);
if (unlikely(retcode))
return retcode;
/* Enforce sane locking for modern driver ioctls. */
if (likely(!drm_core_check_feature(dev, DRIVER_LEGACY)) ||
(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);
}
return retcode;
}
EXPORT_SYMBOL(drm_ioctl_kernel);
/**
* 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 DRM core and the driver dispatch table,
* stored in &drm_driver.ioctls. It checks for necessary permission by calling
* drm_ioctl_permit(), 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 in_size, out_size, drv_size, ksize;
bool is_driver_ioctl;
dev = file_priv->minor->dev;
if (drm_dev_is_unplugged(dev))
return -ENODEV;
if (DRM_IOCTL_TYPE(cmd) != DRM_IOCTL_BASE)
return -ENOTTY;
is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
if (is_driver_ioctl) {
/* driver ioctl */
unsigned int index = nr - DRM_COMMAND_BASE;
if (index >= dev->driver->num_ioctls)
goto err_i1;
index = array_index_nospec(index, dev->driver->num_ioctls);
ioctl = &dev->driver->ioctls[index];
} else {
/* core ioctl */
if (nr >= DRM_CORE_IOCTL_COUNT)
goto err_i1;
nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
ioctl = &drm_ioctls[nr];
}
drv_size = _IOC_SIZE(ioctl->cmd);
out_size = in_size = _IOC_SIZE(cmd);
if ((cmd & ioctl->cmd & IOC_IN) == 0)
in_size = 0;
if ((cmd & ioctl->cmd & IOC_OUT) == 0)
out_size = 0;
ksize = max(max(in_size, out_size), drv_size);
DRM_DEBUG("comm=\"%s\" pid=%d, dev=0x%lx, auth=%d, %s\n",
current->comm, 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;
}
if (ksize <= sizeof(stack_kdata)) {
kdata = stack_kdata;
} else {
kdata = kmalloc(ksize, GFP_KERNEL);
if (!kdata) {
retcode = -ENOMEM;
goto err_i1;
}
}
if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
retcode = -EFAULT;
goto err_i1;
}
if (ksize > in_size)
memset(kdata + in_size, 0, ksize - in_size);
retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags);
if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
retcode = -EFAULT;
err_i1:
if (!ioctl)
DRM_DEBUG("invalid ioctl: comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
current->comm, 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("comm=\"%s\", pid=%d, ret=%d\n", current->comm,
task_pid_nr(current), 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 number, 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;
nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
*flags = drm_ioctls[nr].flags;
return true;
}
EXPORT_SYMBOL(drm_ioctl_flags);