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.
491 * Zero if allowed, -EACCES otherwise.
493 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
495 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
496 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
499 /* AUTH is only for authenticated or render client */
500 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
501 !file_priv->authenticated))
504 /* MASTER is only for master or control clients */
505 if (unlikely((flags & DRM_MASTER) &&
506 !drm_is_current_master(file_priv) &&
507 !drm_is_control_client(file_priv)))
510 /* Control clients must be explicitly allowed */
511 if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
512 drm_is_control_client(file_priv)))
515 /* Render clients must be explicitly allowed */
516 if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
517 drm_is_render_client(file_priv)))
522 EXPORT_SYMBOL(drm_ioctl_permit);
524 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
525 [DRM_IOCTL_NR(ioctl)] = { \
533 static const struct drm_ioctl_desc drm_ioctls[] = {
534 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
535 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
536 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, DRM_UNLOCKED),
537 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED),
538 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
539 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED),
540 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
541 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
542 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
543 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, DRM_UNLOCKED),
544 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_UNLOCKED | DRM_MASTER),
546 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
547 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
548 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
549 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER),
551 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
552 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
554 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
555 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
557 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY),
558 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY),
560 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
561 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
562 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
563 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
564 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
565 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
566 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
568 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
569 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
571 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
572 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
574 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
576 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
577 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
578 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
579 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
580 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
581 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
583 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
585 #if IS_ENABLED(CONFIG_AGP)
586 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
587 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
588 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
589 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
590 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
591 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
592 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
593 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
596 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
597 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
599 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
601 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl, 0),
603 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
605 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
606 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
607 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
609 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
611 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
612 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
624 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
625 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
626 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
627 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
628 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
629 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
630 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
631 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
632 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
633 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
634 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
635 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
636 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
637 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
638 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
639 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
640 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
641 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
642 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
643 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
646 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
649 * drm_ioctl - ioctl callback implementation for DRM drivers
650 * @filp: file this ioctl is called on
651 * @cmd: ioctl cmd number
652 * @arg: user argument
654 * Looks up the ioctl function in the ::ioctls table, checking for root
655 * previleges if so required, and dispatches to the respective function.
658 * Zero on success, negative error code on failure.
660 long drm_ioctl(struct file *filp,
661 unsigned int cmd, unsigned long arg)
663 struct drm_file *file_priv = filp->private_data;
664 struct drm_device *dev;
665 const struct drm_ioctl_desc *ioctl = NULL;
667 unsigned int nr = DRM_IOCTL_NR(cmd);
668 int retcode = -EINVAL;
669 char stack_kdata[128];
671 unsigned int in_size, out_size, drv_size, ksize;
672 bool is_driver_ioctl;
674 dev = file_priv->minor->dev;
676 if (drm_device_is_unplugged(dev))
679 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
681 if (is_driver_ioctl) {
683 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
685 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
688 if (nr >= DRM_CORE_IOCTL_COUNT)
690 ioctl = &drm_ioctls[nr];
693 drv_size = _IOC_SIZE(ioctl->cmd);
694 out_size = in_size = _IOC_SIZE(cmd);
695 if ((cmd & ioctl->cmd & IOC_IN) == 0)
697 if ((cmd & ioctl->cmd & IOC_OUT) == 0)
699 ksize = max(max(in_size, out_size), drv_size);
701 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
702 task_pid_nr(current),
703 (long)old_encode_dev(file_priv->minor->kdev->devt),
704 file_priv->authenticated, ioctl->name);
706 /* Do not trust userspace, use our own definition */
709 if (unlikely(!func)) {
710 DRM_DEBUG("no function\n");
715 retcode = drm_ioctl_permit(ioctl->flags, file_priv);
716 if (unlikely(retcode))
719 if (ksize <= sizeof(stack_kdata)) {
722 kdata = kmalloc(ksize, GFP_KERNEL);
729 if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) {
735 memset(kdata + in_size, 0, ksize - in_size);
737 /* Enforce sane locking for modern driver ioctls. */
738 if (!drm_core_check_feature(dev, DRIVER_LEGACY) ||
739 (ioctl->flags & DRM_UNLOCKED))
740 retcode = func(dev, kdata, file_priv);
742 mutex_lock(&drm_global_mutex);
743 retcode = func(dev, kdata, file_priv);
744 mutex_unlock(&drm_global_mutex);
747 if (copy_to_user((void __user *)arg, kdata, out_size) != 0)
752 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
753 task_pid_nr(current),
754 (long)old_encode_dev(file_priv->minor->kdev->devt),
755 file_priv->authenticated, cmd, nr);
757 if (kdata != stack_kdata)
760 DRM_DEBUG("ret = %d\n", retcode);
763 EXPORT_SYMBOL(drm_ioctl);
766 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
768 * @flags: where to return the ioctl permission flags
770 * This ioctl is only used by the vmwgfx driver to augment the access checks
771 * done by the drm core and insofar a pretty decent layering violation. This
772 * shouldn't be used by any drivers.
775 * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
777 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
779 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
782 if (nr >= DRM_CORE_IOCTL_COUNT)
785 *flags = drm_ioctls[nr].flags;
788 EXPORT_SYMBOL(drm_ioctl_flags);