2 * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
4 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
5 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
8 * Author Rickard E. (Rik) Faith <faith@valinux.com>
9 * Author Gareth Hughes <gareth@valinux.com>
11 * Permission is hereby granted, free of charge, to any person obtaining a
12 * copy of this software and associated documentation files (the "Software"),
13 * to deal in the Software without restriction, including without limitation
14 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
15 * and/or sell copies of the Software, and to permit persons to whom the
16 * Software is furnished to do so, subject to the following conditions:
18 * The above copyright notice and this permission notice (including the next
19 * paragraph) shall be included in all copies or substantial portions of the
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
23 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
25 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
32 #include <drm/drm_auth.h>
33 #include "drm_legacy.h"
34 #include "drm_internal.h"
35 #include "drm_crtc_internal.h"
37 #include <linux/pci.h>
38 #include <linux/export.h>
41 * DOC: getunique and setversion story
43 * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
45 * In an attempt to warn anyone else who's trying to figure out what's going
46 * on here, I'll try to summarize the story. First things first, let's clear up
47 * the names, because the kernel internals, libdrm and the ioctls are all named
50 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
51 * through the drmGetBusid function.
52 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
53 * that code is nerved in the kernel with drm_invalid_op().
54 * - The internal set_busid kernel functions and driver callbacks are
55 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
56 * nerved) allowed userspace to set the busid through the above ioctl.
57 * - Other ioctls and functions involved are named consistently.
59 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
60 * handling pci domains in the busid on ppc. Doing this correctly was only
61 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
62 * special with drm 1.2 and 1.3.
64 * Now the actual horror story of how device lookup in drm works. At large,
65 * there's 2 different ways, either by busid, or by device driver name.
67 * Opening by busid is fairly simple:
69 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
70 * side-effect this fills out the unique name in the master structure.
71 * 2. Call GET_UNIQUE to read out the unique name from the master structure,
72 * which matches the busid thanks to step 1. If it doesn't, proceed to try
73 * the next device node.
75 * Opening by name is slightly different:
77 * 1. Directly call VERSION to get the version and to match against the driver
78 * name returned by that ioctl. Note that SET_VERSION is not called, which
79 * means the the unique name for the master node just opening is _not_ filled
80 * out. This despite that with current drm device nodes are always bound to
81 * one device, and can't be runtime assigned like with drm 1.0.
82 * 2. Match driver name. If it mismatches, proceed to the next device node.
83 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
84 * checking that the first byte in the string is 0). If that's not the case
85 * libdrm skips and proceeds to the next device node. Probably this is just
86 * copypasta from drm 1.0 times where a set unique name meant that the driver
87 * was in use already, but that's just conjecture.
89 * Long story short: To keep the open by name logic working, GET_UNIQUE must
90 * _not_ return a unique string when SET_VERSION hasn't been called yet,
91 * otherwise libdrm breaks. Even when that unique string can't ever change, and
92 * is totally irrelevant for actually opening the device because runtime
93 * assignable device instances were only support in drm 1.0, which is long dead.
94 * But the libdrm code in drmOpenByName somehow survived, hence this can't be
101 * \param inode device inode.
102 * \param file_priv DRM file private.
103 * \param cmd command.
104 * \param arg user argument, pointing to a drm_unique structure.
105 * \return zero on success or a negative number on failure.
107 * Copies the bus id from drm_device::unique into user space.
109 static int drm_getunique(struct drm_device
*dev
, void *data
,
110 struct drm_file
*file_priv
)
112 struct drm_unique
*u
= data
;
113 struct drm_master
*master
= file_priv
->master
;
115 mutex_lock(&master
->dev
->master_mutex
);
116 if (u
->unique_len
>= master
->unique_len
) {
117 if (copy_to_user(u
->unique
, master
->unique
, master
->unique_len
)) {
118 mutex_unlock(&master
->dev
->master_mutex
);
122 u
->unique_len
= master
->unique_len
;
123 mutex_unlock(&master
->dev
->master_mutex
);
129 drm_unset_busid(struct drm_device
*dev
,
130 struct drm_master
*master
)
132 kfree(master
->unique
);
133 master
->unique
= NULL
;
134 master
->unique_len
= 0;
137 static int drm_set_busid(struct drm_device
*dev
, struct drm_file
*file_priv
)
139 struct drm_master
*master
= file_priv
->master
;
142 if (master
->unique
!= NULL
)
143 drm_unset_busid(dev
, master
);
145 if (dev
->driver
->set_busid
) {
146 ret
= dev
->driver
->set_busid(dev
, master
);
148 drm_unset_busid(dev
, master
);
152 WARN_ON(!dev
->unique
);
153 master
->unique
= kstrdup(dev
->unique
, GFP_KERNEL
);
155 master
->unique_len
= strlen(dev
->unique
);
162 * Get client information.
164 * \param inode device inode.
165 * \param file_priv DRM file private.
166 * \param cmd command.
167 * \param arg user argument, pointing to a drm_client structure.
169 * \return zero on success or a negative number on failure.
171 * Searches for the client with the specified index and copies its information
174 static int drm_getclient(struct drm_device
*dev
, void *data
,
175 struct drm_file
*file_priv
)
177 struct drm_client
*client
= data
;
180 * Hollowed-out getclient ioctl to keep some dead old drm tests/tools
181 * not breaking completely. Userspace tools stop enumerating one they
182 * get -EINVAL, hence this is the return value we need to hand back for
183 * no clients tracked.
185 * Unfortunately some clients (*cough* libva *cough*) use this in a fun
186 * attempt to figure out whether they're authenticated or not. Since
187 * that's the only thing they care about, give it to the directly
188 * instead of walking one giant list.
190 if (client
->idx
== 0) {
191 client
->auth
= file_priv
->authenticated
;
192 client
->pid
= task_pid_vnr(current
);
193 client
->uid
= overflowuid
;
204 * Get statistics information.
206 * \param inode device inode.
207 * \param file_priv DRM file private.
208 * \param cmd command.
209 * \param arg user argument, pointing to a drm_stats structure.
211 * \return zero on success or a negative number on failure.
213 static int drm_getstats(struct drm_device
*dev
, void *data
,
214 struct drm_file
*file_priv
)
216 struct drm_stats
*stats
= data
;
218 /* Clear stats to prevent userspace from eating its stack garbage. */
219 memset(stats
, 0, sizeof(*stats
));
225 * Get device/driver capabilities
227 static int drm_getcap(struct drm_device
*dev
, void *data
, struct drm_file
*file_priv
)
229 struct drm_get_cap
*req
= data
;
230 struct drm_crtc
*crtc
;
234 /* Only some caps make sense with UMS/render-only drivers. */
235 switch (req
->capability
) {
236 case DRM_CAP_TIMESTAMP_MONOTONIC
:
237 req
->value
= drm_timestamp_monotonic
;
240 req
->value
|= dev
->driver
->prime_fd_to_handle
? DRM_PRIME_CAP_IMPORT
: 0;
241 req
->value
|= dev
->driver
->prime_handle_to_fd
? DRM_PRIME_CAP_EXPORT
: 0;
245 /* Other caps only work with KMS drivers */
246 if (!drm_core_check_feature(dev
, DRIVER_MODESET
))
249 switch (req
->capability
) {
250 case DRM_CAP_DUMB_BUFFER
:
251 if (dev
->driver
->dumb_create
)
254 case DRM_CAP_VBLANK_HIGH_CRTC
:
257 case DRM_CAP_DUMB_PREFERRED_DEPTH
:
258 req
->value
= dev
->mode_config
.preferred_depth
;
260 case DRM_CAP_DUMB_PREFER_SHADOW
:
261 req
->value
= dev
->mode_config
.prefer_shadow
;
263 case DRM_CAP_ASYNC_PAGE_FLIP
:
264 req
->value
= dev
->mode_config
.async_page_flip
;
266 case DRM_CAP_PAGE_FLIP_TARGET
:
268 drm_for_each_crtc(crtc
, dev
) {
269 if (!crtc
->funcs
->page_flip_target
)
273 case DRM_CAP_CURSOR_WIDTH
:
274 if (dev
->mode_config
.cursor_width
)
275 req
->value
= dev
->mode_config
.cursor_width
;
279 case DRM_CAP_CURSOR_HEIGHT
:
280 if (dev
->mode_config
.cursor_height
)
281 req
->value
= dev
->mode_config
.cursor_height
;
285 case DRM_CAP_ADDFB2_MODIFIERS
:
286 req
->value
= dev
->mode_config
.allow_fb_modifiers
;
295 * Set device/driver capabilities
298 drm_setclientcap(struct drm_device
*dev
, void *data
, struct drm_file
*file_priv
)
300 struct drm_set_client_cap
*req
= data
;
302 switch (req
->capability
) {
303 case DRM_CLIENT_CAP_STEREO_3D
:
306 file_priv
->stereo_allowed
= req
->value
;
308 case DRM_CLIENT_CAP_UNIVERSAL_PLANES
:
311 file_priv
->universal_planes
= req
->value
;
313 case DRM_CLIENT_CAP_ATOMIC
:
314 if (!drm_core_check_feature(dev
, DRIVER_ATOMIC
))
318 file_priv
->atomic
= req
->value
;
319 file_priv
->universal_planes
= req
->value
;
331 * \param inode device inode.
332 * \param file_priv DRM file private.
333 * \param cmd command.
334 * \param arg user argument, pointing to a drm_lock structure.
335 * \return zero on success or negative number on failure.
337 * Sets the requested interface version
339 static int drm_setversion(struct drm_device
*dev
, void *data
, struct drm_file
*file_priv
)
341 struct drm_set_version
*sv
= data
;
342 int if_version
, retcode
= 0;
344 mutex_lock(&dev
->master_mutex
);
345 if (sv
->drm_di_major
!= -1) {
346 if (sv
->drm_di_major
!= DRM_IF_MAJOR
||
347 sv
->drm_di_minor
< 0 || sv
->drm_di_minor
> DRM_IF_MINOR
) {
351 if_version
= DRM_IF_VERSION(sv
->drm_di_major
,
353 dev
->if_version
= max(if_version
, dev
->if_version
);
354 if (sv
->drm_di_minor
>= 1) {
356 * Version 1.1 includes tying of DRM to specific device
357 * Version 1.4 has proper PCI domain support
359 retcode
= drm_set_busid(dev
, file_priv
);
365 if (sv
->drm_dd_major
!= -1) {
366 if (sv
->drm_dd_major
!= dev
->driver
->major
||
367 sv
->drm_dd_minor
< 0 || sv
->drm_dd_minor
>
368 dev
->driver
->minor
) {
375 sv
->drm_di_major
= DRM_IF_MAJOR
;
376 sv
->drm_di_minor
= DRM_IF_MINOR
;
377 sv
->drm_dd_major
= dev
->driver
->major
;
378 sv
->drm_dd_minor
= dev
->driver
->minor
;
379 mutex_unlock(&dev
->master_mutex
);
385 * drm_noop - DRM no-op ioctl implemntation
386 * @dev: DRM device for the ioctl
387 * @data: data pointer for the ioctl
388 * @file_priv: DRM file for the ioctl call
390 * This no-op implementation for drm ioctls is useful for deprecated
391 * functionality where we can't return a failure code because existing userspace
392 * checks the result of the ioctl, but doesn't care about the action.
394 * Always returns successfully with 0.
396 int drm_noop(struct drm_device
*dev
, void *data
,
397 struct drm_file
*file_priv
)
402 EXPORT_SYMBOL(drm_noop
);
405 * drm_invalid_op - DRM invalid ioctl implemntation
406 * @dev: DRM device for the ioctl
407 * @data: data pointer for the ioctl
408 * @file_priv: DRM file for the ioctl call
410 * This no-op implementation for drm ioctls is useful for deprecated
411 * functionality where we really don't want to allow userspace to call the ioctl
412 * any more. This is the case for old ums interfaces for drivers that
413 * transitioned to kms gradually and so kept the old legacy tables around. This
414 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
417 * Always fails with a return value of -EINVAL.
419 int drm_invalid_op(struct drm_device
*dev
, void *data
,
420 struct drm_file
*file_priv
)
424 EXPORT_SYMBOL(drm_invalid_op
);
427 * Copy and IOCTL return string to user space
429 static int drm_copy_field(char __user
*buf
, size_t *buf_len
, const char *value
)
433 /* don't overflow userbuf */
438 /* let userspace know exact length of driver value (which could be
439 * larger than the userspace-supplied buffer) */
440 *buf_len
= strlen(value
);
442 /* finally, try filling in the userbuf */
444 if (copy_to_user(buf
, value
, len
))
450 * Get version information
452 * \param inode device inode.
453 * \param filp file pointer.
454 * \param cmd command.
455 * \param arg user argument, pointing to a drm_version structure.
456 * \return zero on success or negative number on failure.
458 * Fills in the version information in \p arg.
460 static int drm_version(struct drm_device
*dev
, void *data
,
461 struct drm_file
*file_priv
)
463 struct drm_version
*version
= data
;
466 version
->version_major
= dev
->driver
->major
;
467 version
->version_minor
= dev
->driver
->minor
;
468 version
->version_patchlevel
= dev
->driver
->patchlevel
;
469 err
= drm_copy_field(version
->name
, &version
->name_len
,
472 err
= drm_copy_field(version
->date
, &version
->date_len
,
475 err
= drm_copy_field(version
->desc
, &version
->desc_len
,
482 * drm_ioctl_permit - Check ioctl permissions against caller
484 * @flags: ioctl permission flags.
485 * @file_priv: Pointer to struct drm_file identifying the caller.
487 * Checks whether the caller is allowed to run an ioctl with the
488 * indicated permissions. If so, returns zero. Otherwise returns an
489 * error code suitable for ioctl return.
491 int drm_ioctl_permit(u32 flags
, struct drm_file
*file_priv
)
493 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
494 if (unlikely((flags
& DRM_ROOT_ONLY
) && !capable(CAP_SYS_ADMIN
)))
497 /* AUTH is only for authenticated or render client */
498 if (unlikely((flags
& DRM_AUTH
) && !drm_is_render_client(file_priv
) &&
499 !file_priv
->authenticated
))
502 /* MASTER is only for master or control clients */
503 if (unlikely((flags
& DRM_MASTER
) &&
504 !drm_is_current_master(file_priv
) &&
505 !drm_is_control_client(file_priv
)))
508 /* Control clients must be explicitly allowed */
509 if (unlikely(!(flags
& DRM_CONTROL_ALLOW
) &&
510 drm_is_control_client(file_priv
)))
513 /* Render clients must be explicitly allowed */
514 if (unlikely(!(flags
& DRM_RENDER_ALLOW
) &&
515 drm_is_render_client(file_priv
)))
520 EXPORT_SYMBOL(drm_ioctl_permit
);
522 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
523 [DRM_IOCTL_NR(ioctl)] = { \
531 static const struct drm_ioctl_desc drm_ioctls
[] = {
532 DRM_IOCTL_DEF(DRM_IOCTL_VERSION
, drm_version
,
533 DRM_UNLOCKED
|DRM_RENDER_ALLOW
|DRM_CONTROL_ALLOW
),
534 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE
, drm_getunique
, DRM_UNLOCKED
),
535 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC
, drm_getmagic
, DRM_UNLOCKED
),
536 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID
, drm_irq_by_busid
, DRM_MASTER
|DRM_ROOT_ONLY
),
537 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP
, drm_legacy_getmap_ioctl
, DRM_UNLOCKED
),
538 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT
, drm_getclient
, DRM_UNLOCKED
),
539 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS
, drm_getstats
, DRM_UNLOCKED
),
540 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP
, drm_getcap
, DRM_UNLOCKED
|DRM_RENDER_ALLOW
),
541 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP
, drm_setclientcap
, DRM_UNLOCKED
),
542 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION
, drm_setversion
, DRM_UNLOCKED
| DRM_MASTER
),
544 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE
, drm_invalid_op
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
545 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK
, drm_noop
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
546 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK
, drm_noop
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
547 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC
, drm_authmagic
, DRM_AUTH
|DRM_UNLOCKED
|DRM_MASTER
),
549 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP
, drm_legacy_addmap_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
550 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP
, drm_legacy_rmmap_ioctl
, DRM_AUTH
),
552 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX
, drm_legacy_setsareactx
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
553 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX
, drm_legacy_getsareactx
, DRM_AUTH
),
555 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER
, drm_setmaster_ioctl
, DRM_UNLOCKED
|DRM_ROOT_ONLY
),
556 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER
, drm_dropmaster_ioctl
, DRM_UNLOCKED
|DRM_ROOT_ONLY
),
558 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX
, drm_legacy_addctx
, DRM_AUTH
|DRM_ROOT_ONLY
),
559 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX
, drm_legacy_rmctx
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
560 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX
, drm_noop
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
561 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX
, drm_legacy_getctx
, DRM_AUTH
),
562 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX
, drm_legacy_switchctx
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
563 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX
, drm_legacy_newctx
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
564 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX
, drm_legacy_resctx
, DRM_AUTH
),
566 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW
, drm_noop
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
567 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW
, drm_noop
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
569 DRM_IOCTL_DEF(DRM_IOCTL_LOCK
, drm_legacy_lock
, DRM_AUTH
),
570 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK
, drm_legacy_unlock
, DRM_AUTH
),
572 DRM_IOCTL_DEF(DRM_IOCTL_FINISH
, drm_noop
, DRM_AUTH
),
574 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS
, drm_legacy_addbufs
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
575 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS
, drm_legacy_markbufs
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
576 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS
, drm_legacy_infobufs
, DRM_AUTH
),
577 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS
, drm_legacy_mapbufs
, DRM_AUTH
),
578 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS
, drm_legacy_freebufs
, DRM_AUTH
),
579 DRM_IOCTL_DEF(DRM_IOCTL_DMA
, drm_legacy_dma_ioctl
, DRM_AUTH
),
581 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL
, drm_legacy_irq_control
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
583 #if IS_ENABLED(CONFIG_AGP)
584 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE
, drm_agp_acquire_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
585 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE
, drm_agp_release_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
586 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE
, drm_agp_enable_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
587 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO
, drm_agp_info_ioctl
, DRM_AUTH
),
588 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC
, drm_agp_alloc_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
589 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE
, drm_agp_free_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
590 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND
, drm_agp_bind_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
591 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND
, drm_agp_unbind_ioctl
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
594 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC
, drm_legacy_sg_alloc
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
595 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE
, drm_legacy_sg_free
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
597 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK
, drm_wait_vblank
, DRM_UNLOCKED
),
599 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL
, drm_legacy_modeset_ctl
, 0),
601 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW
, drm_noop
, DRM_AUTH
|DRM_MASTER
|DRM_ROOT_ONLY
),
603 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE
, drm_gem_close_ioctl
, DRM_UNLOCKED
|DRM_RENDER_ALLOW
),
604 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK
, drm_gem_flink_ioctl
, DRM_AUTH
|DRM_UNLOCKED
),
605 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN
, drm_gem_open_ioctl
, DRM_AUTH
|DRM_UNLOCKED
),
607 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES
, drm_mode_getresources
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
609 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD
, drm_prime_handle_to_fd_ioctl
, DRM_AUTH
|DRM_UNLOCKED
|DRM_RENDER_ALLOW
),
610 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE
, drm_prime_fd_to_handle_ioctl
, DRM_AUTH
|DRM_UNLOCKED
|DRM_RENDER_ALLOW
),
612 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES
, drm_mode_getplane_res
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
613 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC
, drm_mode_getcrtc
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC
, drm_mode_setcrtc
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE
, drm_mode_getplane
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE
, drm_mode_setplane
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR
, drm_mode_cursor_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA
, drm_mode_gamma_get_ioctl
, DRM_UNLOCKED
),
619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA
, drm_mode_gamma_set_ioctl
, DRM_MASTER
|DRM_UNLOCKED
),
620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER
, drm_mode_getencoder
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR
, drm_mode_getconnector
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE
, drm_noop
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE
, drm_noop
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
624 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY
, drm_mode_getproperty_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
625 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY
, drm_mode_connector_property_set_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
626 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB
, drm_mode_getblob_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
627 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB
, drm_mode_getfb
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
628 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB
, drm_mode_addfb
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
629 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2
, drm_mode_addfb2
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
630 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB
, drm_mode_rmfb
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP
, drm_mode_page_flip_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
632 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB
, drm_mode_dirtyfb_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
633 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB
, drm_mode_create_dumb_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
634 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB
, drm_mode_mmap_dumb_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
635 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB
, drm_mode_destroy_dumb_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES
, drm_mode_obj_get_properties_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY
, drm_mode_obj_set_property_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2
, drm_mode_cursor2_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
639 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC
, drm_mode_atomic_ioctl
, DRM_MASTER
|DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
640 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB
, drm_mode_createblob_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
641 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB
, drm_mode_destroyblob_ioctl
, DRM_CONTROL_ALLOW
|DRM_UNLOCKED
),
644 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
647 * drm_ioctl - ioctl callback implementation for DRM drivers
648 * @filp: file this ioctl is called on
649 * @cmd: ioctl cmd number
650 * @arg: user argument
652 * Looks up the ioctl function in the ::ioctls table, checking for root
653 * previleges if so required, and dispatches to the respective function.
656 * Zero on success, negative error code on failure.
658 long drm_ioctl(struct file
*filp
,
659 unsigned int cmd
, unsigned long arg
)
661 struct drm_file
*file_priv
= filp
->private_data
;
662 struct drm_device
*dev
;
663 const struct drm_ioctl_desc
*ioctl
= NULL
;
665 unsigned int nr
= DRM_IOCTL_NR(cmd
);
666 int retcode
= -EINVAL
;
667 char stack_kdata
[128];
669 unsigned int in_size
, out_size
, drv_size
, ksize
;
670 bool is_driver_ioctl
;
672 dev
= file_priv
->minor
->dev
;
674 if (drm_device_is_unplugged(dev
))
677 is_driver_ioctl
= nr
>= DRM_COMMAND_BASE
&& nr
< DRM_COMMAND_END
;
679 if (is_driver_ioctl
) {
681 if (nr
- DRM_COMMAND_BASE
>= dev
->driver
->num_ioctls
)
683 ioctl
= &dev
->driver
->ioctls
[nr
- DRM_COMMAND_BASE
];
686 if (nr
>= DRM_CORE_IOCTL_COUNT
)
688 ioctl
= &drm_ioctls
[nr
];
691 drv_size
= _IOC_SIZE(ioctl
->cmd
);
692 out_size
= in_size
= _IOC_SIZE(cmd
);
693 if ((cmd
& ioctl
->cmd
& IOC_IN
) == 0)
695 if ((cmd
& ioctl
->cmd
& IOC_OUT
) == 0)
697 ksize
= max(max(in_size
, out_size
), drv_size
);
699 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
700 task_pid_nr(current
),
701 (long)old_encode_dev(file_priv
->minor
->kdev
->devt
),
702 file_priv
->authenticated
, ioctl
->name
);
704 /* Do not trust userspace, use our own definition */
707 if (unlikely(!func
)) {
708 DRM_DEBUG("no function\n");
713 retcode
= drm_ioctl_permit(ioctl
->flags
, file_priv
);
714 if (unlikely(retcode
))
717 if (ksize
<= sizeof(stack_kdata
)) {
720 kdata
= kmalloc(ksize
, GFP_KERNEL
);
727 if (copy_from_user(kdata
, (void __user
*)arg
, in_size
) != 0) {
733 memset(kdata
+ in_size
, 0, ksize
- in_size
);
735 /* Enforce sane locking for modern driver ioctls. */
736 if (!drm_core_check_feature(dev
, DRIVER_LEGACY
) ||
737 (ioctl
->flags
& DRM_UNLOCKED
))
738 retcode
= func(dev
, kdata
, file_priv
);
740 mutex_lock(&drm_global_mutex
);
741 retcode
= func(dev
, kdata
, file_priv
);
742 mutex_unlock(&drm_global_mutex
);
745 if (copy_to_user((void __user
*)arg
, kdata
, out_size
) != 0)
750 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
751 task_pid_nr(current
),
752 (long)old_encode_dev(file_priv
->minor
->kdev
->devt
),
753 file_priv
->authenticated
, cmd
, nr
);
755 if (kdata
!= stack_kdata
)
758 DRM_DEBUG("ret = %d\n", retcode
);
761 EXPORT_SYMBOL(drm_ioctl
);
764 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
766 * @flags: where to return the ioctl permission flags
768 * This ioctl is only used by the vmwgfx driver to augment the access checks
769 * done by the drm core and insofar a pretty decent layering violation. This
770 * shouldn't be used by any drivers.
773 * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
775 bool drm_ioctl_flags(unsigned int nr
, unsigned int *flags
)
777 if (nr
>= DRM_COMMAND_BASE
&& nr
< DRM_COMMAND_END
)
780 if (nr
>= DRM_CORE_IOCTL_COUNT
)
783 *flags
= drm_ioctls
[nr
].flags
;
786 EXPORT_SYMBOL(drm_ioctl_flags
);