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_core.h>
33 #include <drm/drm_auth.h>
34 #include "drm_legacy.h"
35 #include "drm_internal.h"
36 #include "drm_crtc_internal.h"
38 #include <linux/pci.h>
39 #include <linux/export.h>
42 * DOC: getunique and setversion story
44 * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
46 * In an attempt to warn anyone else who's trying to figure out what's going
47 * on here, I'll try to summarize the story. First things first, let's clear up
48 * the names, because the kernel internals, libdrm and the ioctls are all named
51 * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
52 * through the drmGetBusid function.
53 * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
54 * that code is nerved in the kernel with drm_invalid_op().
55 * - The internal set_busid kernel functions and driver callbacks are
56 * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
57 * nerved) allowed userspace to set the busid through the above ioctl.
58 * - Other ioctls and functions involved are named consistently.
60 * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
61 * handling pci domains in the busid on ppc. Doing this correctly was only
62 * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
63 * special with drm 1.2 and 1.3.
65 * Now the actual horror story of how device lookup in drm works. At large,
66 * there's 2 different ways, either by busid, or by device driver name.
68 * Opening by busid is fairly simple:
70 * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
71 * side-effect this fills out the unique name in the master structure.
72 * 2. Call GET_UNIQUE to read out the unique name from the master structure,
73 * which matches the busid thanks to step 1. If it doesn't, proceed to try
74 * the next device node.
76 * Opening by name is slightly different:
78 * 1. Directly call VERSION to get the version and to match against the driver
79 * name returned by that ioctl. Note that SET_VERSION is not called, which
80 * means the the unique name for the master node just opening is _not_ filled
81 * out. This despite that with current drm device nodes are always bound to
82 * one device, and can't be runtime assigned like with drm 1.0.
83 * 2. Match driver name. If it mismatches, proceed to the next device node.
84 * 3. Call GET_UNIQUE, and check whether the unique name has length zero (by
85 * checking that the first byte in the string is 0). If that's not the case
86 * libdrm skips and proceeds to the next device node. Probably this is just
87 * copypasta from drm 1.0 times where a set unique name meant that the driver
88 * was in use already, but that's just conjecture.
90 * Long story short: To keep the open by name logic working, GET_UNIQUE must
91 * _not_ return a unique string when SET_VERSION hasn't been called yet,
92 * otherwise libdrm breaks. Even when that unique string can't ever change, and
93 * is totally irrelevant for actually opening the device because runtime
94 * assignable device instances were only support in drm 1.0, which is long dead.
95 * But the libdrm code in drmOpenByName somehow survived, hence this can't be
99 static int drm_version(struct drm_device *dev, void *data,
100 struct drm_file *file_priv);
105 * \param inode device inode.
106 * \param file_priv DRM file private.
107 * \param cmd command.
108 * \param arg user argument, pointing to a drm_unique structure.
109 * \return zero on success or a negative number on failure.
111 * Copies the bus id from drm_device::unique into user space.
113 static int drm_getunique(struct drm_device *dev, void *data,
114 struct drm_file *file_priv)
116 struct drm_unique *u = data;
117 struct drm_master *master = file_priv->master;
119 if (u->unique_len >= master->unique_len) {
120 if (copy_to_user(u->unique, master->unique, master->unique_len))
123 u->unique_len = master->unique_len;
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 = pid_vnr(file_priv->pid);
193 client->uid = from_kuid_munged(current_user_ns(),
205 * Get statistics information.
207 * \param inode device inode.
208 * \param file_priv DRM file private.
209 * \param cmd command.
210 * \param arg user argument, pointing to a drm_stats structure.
212 * \return zero on success or a negative number on failure.
214 static int drm_getstats(struct drm_device *dev, void *data,
215 struct drm_file *file_priv)
217 struct drm_stats *stats = data;
219 /* Clear stats to prevent userspace from eating its stack garbage. */
220 memset(stats, 0, sizeof(*stats));
226 * Get device/driver capabilities
228 static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
230 struct drm_get_cap *req = data;
233 switch (req->capability) {
234 case DRM_CAP_DUMB_BUFFER:
235 if (dev->driver->dumb_create)
238 case DRM_CAP_VBLANK_HIGH_CRTC:
241 case DRM_CAP_DUMB_PREFERRED_DEPTH:
242 req->value = dev->mode_config.preferred_depth;
244 case DRM_CAP_DUMB_PREFER_SHADOW:
245 req->value = dev->mode_config.prefer_shadow;
248 req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
249 req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
251 case DRM_CAP_TIMESTAMP_MONOTONIC:
252 req->value = drm_timestamp_monotonic;
254 case DRM_CAP_ASYNC_PAGE_FLIP:
255 req->value = dev->mode_config.async_page_flip;
257 case DRM_CAP_CURSOR_WIDTH:
258 if (dev->mode_config.cursor_width)
259 req->value = dev->mode_config.cursor_width;
263 case DRM_CAP_CURSOR_HEIGHT:
264 if (dev->mode_config.cursor_height)
265 req->value = dev->mode_config.cursor_height;
269 case DRM_CAP_ADDFB2_MODIFIERS:
270 req->value = dev->mode_config.allow_fb_modifiers;
279 * Set device/driver capabilities
282 drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
284 struct drm_set_client_cap *req = data;
286 switch (req->capability) {
287 case DRM_CLIENT_CAP_STEREO_3D:
290 file_priv->stereo_allowed = req->value;
292 case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
295 file_priv->universal_planes = req->value;
297 case DRM_CLIENT_CAP_ATOMIC:
298 if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
302 file_priv->atomic = req->value;
303 file_priv->universal_planes = req->value;
315 * \param inode device inode.
316 * \param file_priv DRM file private.
317 * \param cmd command.
318 * \param arg user argument, pointing to a drm_lock structure.
319 * \return zero on success or negative number on failure.
321 * Sets the requested interface version
323 static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
325 struct drm_set_version *sv = data;
326 int if_version, retcode = 0;
328 if (sv->drm_di_major != -1) {
329 if (sv->drm_di_major != DRM_IF_MAJOR ||
330 sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
334 if_version = DRM_IF_VERSION(sv->drm_di_major,
336 dev->if_version = max(if_version, dev->if_version);
337 if (sv->drm_di_minor >= 1) {
339 * Version 1.1 includes tying of DRM to specific device
340 * Version 1.4 has proper PCI domain support
342 retcode = drm_set_busid(dev, file_priv);
348 if (sv->drm_dd_major != -1) {
349 if (sv->drm_dd_major != dev->driver->major ||
350 sv->drm_dd_minor < 0 || sv->drm_dd_minor >
351 dev->driver->minor) {
358 sv->drm_di_major = DRM_IF_MAJOR;
359 sv->drm_di_minor = DRM_IF_MINOR;
360 sv->drm_dd_major = dev->driver->major;
361 sv->drm_dd_minor = dev->driver->minor;
367 * drm_noop - DRM no-op ioctl implemntation
368 * @dev: DRM device for the ioctl
369 * @data: data pointer for the ioctl
370 * @file_priv: DRM file for the ioctl call
372 * This no-op implementation for drm ioctls is useful for deprecated
373 * functionality where we can't return a failure code because existing userspace
374 * checks the result of the ioctl, but doesn't care about the action.
376 * Always returns successfully with 0.
378 int drm_noop(struct drm_device *dev, void *data,
379 struct drm_file *file_priv)
384 EXPORT_SYMBOL(drm_noop);
387 * drm_invalid_op - DRM invalid ioctl implemntation
388 * @dev: DRM device for the ioctl
389 * @data: data pointer for the ioctl
390 * @file_priv: DRM file for the ioctl call
392 * This no-op implementation for drm ioctls is useful for deprecated
393 * functionality where we really don't want to allow userspace to call the ioctl
394 * any more. This is the case for old ums interfaces for drivers that
395 * transitioned to kms gradually and so kept the old legacy tables around. This
396 * only applies to radeon and i915 kms drivers, other drivers shouldn't need to
399 * Always fails with a return value of -EINVAL.
401 int drm_invalid_op(struct drm_device *dev, void *data,
402 struct drm_file *file_priv)
406 EXPORT_SYMBOL(drm_invalid_op);
409 * Copy and IOCTL return string to user space
411 static int drm_copy_field(char __user *buf, size_t *buf_len, const char *value)
415 /* don't overflow userbuf */
420 /* let userspace know exact length of driver value (which could be
421 * larger than the userspace-supplied buffer) */
422 *buf_len = strlen(value);
424 /* finally, try filling in the userbuf */
426 if (copy_to_user(buf, value, len))
432 * Get version information
434 * \param inode device inode.
435 * \param filp file pointer.
436 * \param cmd command.
437 * \param arg user argument, pointing to a drm_version structure.
438 * \return zero on success or negative number on failure.
440 * Fills in the version information in \p arg.
442 static int drm_version(struct drm_device *dev, void *data,
443 struct drm_file *file_priv)
445 struct drm_version *version = data;
448 version->version_major = dev->driver->major;
449 version->version_minor = dev->driver->minor;
450 version->version_patchlevel = dev->driver->patchlevel;
451 err = drm_copy_field(version->name, &version->name_len,
454 err = drm_copy_field(version->date, &version->date_len,
457 err = drm_copy_field(version->desc, &version->desc_len,
464 * drm_ioctl_permit - Check ioctl permissions against caller
466 * @flags: ioctl permission flags.
467 * @file_priv: Pointer to struct drm_file identifying the caller.
469 * Checks whether the caller is allowed to run an ioctl with the
470 * indicated permissions. If so, returns zero. Otherwise returns an
471 * error code suitable for ioctl return.
473 int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
475 /* ROOT_ONLY is only for CAP_SYS_ADMIN */
476 if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
479 /* AUTH is only for authenticated or render client */
480 if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
481 !file_priv->authenticated))
484 /* MASTER is only for master or control clients */
485 if (unlikely((flags & DRM_MASTER) &&
486 !drm_is_current_master(file_priv) &&
487 !drm_is_control_client(file_priv)))
490 /* Control clients must be explicitly allowed */
491 if (unlikely(!(flags & DRM_CONTROL_ALLOW) &&
492 drm_is_control_client(file_priv)))
495 /* Render clients must be explicitly allowed */
496 if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
497 drm_is_render_client(file_priv)))
502 EXPORT_SYMBOL(drm_ioctl_permit);
504 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
505 [DRM_IOCTL_NR(ioctl)] = { \
513 static const struct drm_ioctl_desc drm_ioctls[] = {
514 DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version,
515 DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_ALLOW),
516 DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
517 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, DRM_UNLOCKED),
518 DRM_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_irq_by_busid, DRM_MASTER|DRM_ROOT_ONLY),
519 DRM_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, DRM_UNLOCKED),
520 DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, DRM_UNLOCKED),
521 DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, DRM_UNLOCKED),
522 DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_UNLOCKED|DRM_RENDER_ALLOW),
523 DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
524 DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, DRM_MASTER),
526 DRM_IOCTL_DEF(DRM_IOCTL_SET_UNIQUE, drm_invalid_op, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
527 DRM_IOCTL_DEF(DRM_IOCTL_BLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
528 DRM_IOCTL_DEF(DRM_IOCTL_UNBLOCK, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
529 DRM_IOCTL_DEF(DRM_IOCTL_AUTH_MAGIC, drm_authmagic, DRM_AUTH|DRM_UNLOCKED|DRM_MASTER),
531 DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
532 DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
534 DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
535 DRM_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
537 DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY),
538 DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, DRM_UNLOCKED|DRM_ROOT_ONLY),
540 DRM_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
541 DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
542 DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
543 DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
544 DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
545 DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
546 DRM_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
548 DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
549 DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
551 DRM_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
552 DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
554 DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
556 DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
557 DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
558 DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
559 DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
560 DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
561 DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
563 DRM_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
565 #if IS_ENABLED(CONFIG_AGP)
566 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_agp_acquire_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
567 DRM_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_agp_release_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
568 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_agp_enable_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
569 DRM_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_agp_info_ioctl, DRM_AUTH),
570 DRM_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_agp_alloc_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
571 DRM_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_agp_free_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
572 DRM_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_agp_bind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
573 DRM_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_agp_unbind_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
576 DRM_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
577 DRM_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
579 DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank, DRM_UNLOCKED),
581 DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_modeset_ctl, 0),
583 DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
585 DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW),
586 DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH|DRM_UNLOCKED),
587 DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH|DRM_UNLOCKED),
589 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
591 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
592 DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_AUTH|DRM_UNLOCKED|DRM_RENDER_ALLOW),
594 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
595 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
596 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
597 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
598 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
599 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
600 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, DRM_UNLOCKED),
601 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER|DRM_UNLOCKED),
602 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
603 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
604 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
605 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
606 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
607 DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
608 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
609 DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
610 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
611 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
612 DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
613 DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
614 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
615 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
616 DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
617 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
618 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
619 DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
620 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
621 DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED),
622 DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
623 DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED),
626 #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls )
629 * drm_ioctl - ioctl callback implementation for DRM drivers
630 * @filp: file this ioctl is called on
631 * @cmd: ioctl cmd number
632 * @arg: user argument
634 * Looks up the ioctl function in the ::ioctls table, checking for root
635 * previleges if so required, and dispatches to the respective function.
638 * Zero on success, negative error code on failure.
640 long drm_ioctl(struct file *filp,
641 unsigned int cmd, unsigned long arg)
643 struct drm_file *file_priv = filp->private_data;
644 struct drm_device *dev;
645 const struct drm_ioctl_desc *ioctl = NULL;
647 unsigned int nr = DRM_IOCTL_NR(cmd);
648 int retcode = -EINVAL;
649 char stack_kdata[128];
651 unsigned int usize, asize, drv_size;
652 bool is_driver_ioctl;
654 dev = file_priv->minor->dev;
656 if (drm_device_is_unplugged(dev))
659 is_driver_ioctl = nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END;
661 if (is_driver_ioctl) {
663 if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
665 ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
668 if (nr >= DRM_CORE_IOCTL_COUNT)
670 ioctl = &drm_ioctls[nr];
673 drv_size = _IOC_SIZE(ioctl->cmd);
674 usize = _IOC_SIZE(cmd);
675 asize = max(usize, drv_size);
678 DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
679 task_pid_nr(current),
680 (long)old_encode_dev(file_priv->minor->kdev->devt),
681 file_priv->authenticated, ioctl->name);
683 /* Do not trust userspace, use our own definition */
686 if (unlikely(!func)) {
687 DRM_DEBUG("no function\n");
692 retcode = drm_ioctl_permit(ioctl->flags, file_priv);
693 if (unlikely(retcode))
696 if (cmd & (IOC_IN | IOC_OUT)) {
697 if (asize <= sizeof(stack_kdata)) {
700 kdata = kmalloc(asize, GFP_KERNEL);
707 memset(kdata + usize, 0, asize - usize);
711 if (copy_from_user(kdata, (void __user *)arg,
716 } else if (cmd & IOC_OUT) {
717 memset(kdata, 0, usize);
720 /* Enforce sane locking for kms driver ioctls. Core ioctls are
721 * too messy still. */
722 if ((drm_core_check_feature(dev, DRIVER_MODESET) && is_driver_ioctl) ||
723 (ioctl->flags & DRM_UNLOCKED))
724 retcode = func(dev, kdata, file_priv);
726 mutex_lock(&drm_global_mutex);
727 retcode = func(dev, kdata, file_priv);
728 mutex_unlock(&drm_global_mutex);
732 if (copy_to_user((void __user *)arg, kdata,
739 DRM_DEBUG("invalid ioctl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
740 task_pid_nr(current),
741 (long)old_encode_dev(file_priv->minor->kdev->devt),
742 file_priv->authenticated, cmd, nr);
744 if (kdata != stack_kdata)
747 DRM_DEBUG("ret = %d\n", retcode);
750 EXPORT_SYMBOL(drm_ioctl);
753 * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
755 * @flags: where to return the ioctl permission flags
757 * This ioctl is only used by the vmwgfx driver to augment the access checks
758 * done by the drm core and insofar a pretty decent layering violation. This
759 * shouldn't be used by any drivers.
762 * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
764 bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
766 if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
769 if (nr >= DRM_CORE_IOCTL_COUNT)
772 *flags = drm_ioctls[nr].flags;
775 EXPORT_SYMBOL(drm_ioctl_flags);