Changeset View
Changeset View
Standalone View
Standalone View
sys/dev/drm/core/drm_ioctl.c
- This file was added.
/* | |||||
* 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. | |||||
*/ | |||||
/* FBSD: Linux header polution, we need fs.h and ioctl.h */ | |||||
#include <linux/fs.h> | |||||
#include <linux/ioctl.h> | |||||
#include <linux/export.h> | |||||
#include <linux/nospec.h> | |||||
#include <linux/pci.h> | |||||
#include <linux/uaccess.h> | |||||
#include <drm/drm_agpsupport.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 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 = file_priv->master; | |||||
mutex_lock(&master->dev->master_mutex); | |||||
if (u->unique_len >= master->unique_len) { | |||||
if (copy_to_user(u->unique, master->unique, master->unique_len)) { | |||||
mutex_unlock(&master->dev->master_mutex); | |||||
return -EFAULT; | |||||
} | |||||
} | |||||
u->unique_len = master->unique_len; | |||||
mutex_unlock(&master->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; | |||||
#if defined(__linux__) || defined(CONFIG_PCI) | |||||
int ret; | |||||
#endif | |||||
if (master->unique != NULL) | |||||
drm_unset_busid(dev, master); | |||||
#if defined(__linux__) || defined(CONFIG_PCI) | |||||
#ifdef __linux__ | |||||
if (dev->dev && dev_is_pci(dev->dev)) { | |||||
#else | |||||
// BSDFIXME: Assume it's PCI for now | |||||
if (dev->dev) { | |||||
#endif | |||||
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); | |||||
} | |||||
#else | |||||
WARN_ON(!dev->unique); | |||||
master->unique = kstrdup(dev->unique, GFP_KERNEL); | |||||
if (master->unique) | |||||
master->unique_len = strlen(dev->unique); | |||||
#endif | |||||
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); | |||||
#ifdef __linux__ | |||||
client->uid = overflowuid; | |||||
#else | |||||
client->uid = 0; | |||||
#endif | |||||
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; | |||||
} | |||||
/* 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.allow_fb_modifiers; | |||||
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 implemntation | |||||
* @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 implemntation | |||||
* @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) | |||||
{ | |||||
int len; | |||||
/* 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; | |||||
} | |||||
/** | |||||
* drm_ioctl_permit - Check ioctl permissions against caller | |||||
* | |||||
* @flags: ioctl permission flags. | |||||
* @file_priv: Pointer to struct drm_file identifying the caller. | |||||
* | |||||
* Checks whether the caller is allowed to run an ioctl with the | |||||
* indicated permissions. | |||||
* | |||||
* Returns: | |||||
* Zero if allowed, -EACCES otherwise. | |||||
*/ | |||||
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; | |||||
} | |||||
EXPORT_SYMBOL(drm_ioctl_permit); | |||||
#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_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY), | |||||
DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 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, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_UNLOCKED | 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_UNLOCKED|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, DRM_UNLOCKED|DRM_ROOT_ONLY), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY), | |||||
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_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_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_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_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_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|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_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, | |||||
DRM_UNLOCKED|DRM_RENDER_ALLOW), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, DRM_UNLOCKED), | |||||
#ifdef __linux__ | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER|DRM_UNLOCKED), | |||||
#endif | |||||
}; | |||||
#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/ioctl/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 (!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; | |||||
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); | |||||
#ifdef __linux__ | |||||
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); | |||||
#else | |||||
DRM_DEBUG("%s: pid=%d, auth=%d, %s\n", __func__, task_pid_nr(current), | |||||
file_priv->authenticated, ioctl->name); | |||||
#endif | |||||
/* 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; | |||||
} | |||||
} | |||||
// Some weird stuff is happening in copy_from_user | |||||
#ifdef __linux__ | |||||
if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { | |||||
retcode = -EFAULT; | |||||
goto err_i1; | |||||
} | |||||
#else | |||||
memcpy(kdata, (void __user *)arg, in_size); | |||||
#endif | |||||
if (ksize > in_size) | |||||
memset(kdata + in_size, 0, ksize - in_size); | |||||
retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); | |||||
#ifdef __linux__ | |||||
if (copy_to_user((void __user *)arg, kdata, out_size) != 0) | |||||
retcode = -EFAULT; | |||||
#else | |||||
memcpy((void __user *)arg, kdata, out_size); | |||||
#endif | |||||
err_i1: | |||||
if (!ioctl) | |||||
#ifdef __linux__ | |||||
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); | |||||
#endif | |||||
if (kdata != stack_kdata) | |||||
kfree(kdata); | |||||
if (retcode) | |||||
DRM_DEBUG("pid=%d, ret = %d\n", 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); |