| /* |
| * Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com |
| * |
| * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
| * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
| * All Rights Reserved. |
| * |
| * Author Rickard E. (Rik) Faith <faith@valinux.com> |
| * Author Gareth Hughes <gareth@valinux.com> |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice (including the next |
| * paragraph) shall be included in all copies or substantial portions of the |
| * Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
| * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
| * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
| * OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <drm/drm_ioctl.h> |
| #include <drm/drmP.h> |
| #include <drm/drm_auth.h> |
| #include "drm_legacy.h" |
| #include "drm_internal.h" |
| #include "drm_crtc_internal.h" |
| |
| #include <linux/pci.h> |
| #include <linux/export.h> |
| #include <linux/nospec.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; |
| int ret; |
| |
| if (master->unique != NULL) |
| drm_unset_busid(dev, master); |
| |
| if (dev->dev && dev_is_pci(dev->dev)) { |
| ret = drm_pci_set_busid(dev, master); |
| if (ret) { |
| drm_unset_busid(dev, master); |
| return ret; |
| } |
| } else { |
| WARN_ON(!dev->unique); |
| master->unique = kstrdup(dev->unique, GFP_KERNEL); |
| if (master->unique) |
| master->unique_len = strlen(dev->unique); |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Get client information. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument, pointing to a drm_client structure. |
| * |
| * \return zero on success or a negative number on failure. |
| * |
| * Searches for the client with the specified index and copies its information |
| * into userspace |
| */ |
| int drm_getclient(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_client *client = data; |
| |
| /* |
| * Hollowed-out getclient ioctl to keep some dead old drm tests/tools |
| * not breaking completely. Userspace tools stop enumerating one they |
| * get -EINVAL, hence this is the return value we need to hand back for |
| * no clients tracked. |
| * |
| * Unfortunately some clients (*cough* libva *cough*) use this in a fun |
| * attempt to figure out whether they're authenticated or not. Since |
| * that's the only thing they care about, give it to the directly |
| * instead of walking one giant list. |
| */ |
| if (client->idx == 0) { |
| client->auth = file_priv->authenticated; |
| client->pid = task_pid_vnr(current); |
| client->uid = overflowuid; |
| client->magic = 0; |
| client->iocs = 0; |
| |
| return 0; |
| } else { |
| return -EINVAL; |
| } |
| } |
| |
| /* |
| * Get statistics information. |
| * |
| * \param inode device inode. |
| * \param file_priv DRM file private. |
| * \param cmd command. |
| * \param arg user argument, pointing to a drm_stats structure. |
| * |
| * \return zero on success or a negative number on failure. |
| */ |
| static int drm_getstats(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_stats *stats = data; |
| |
| /* Clear stats to prevent userspace from eating its stack garbage. */ |
| memset(stats, 0, sizeof(*stats)); |
| |
| return 0; |
| } |
| |
| /* |
| * Get device/driver capabilities |
| */ |
| static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv) |
| { |
| struct drm_get_cap *req = data; |
| struct drm_crtc *crtc; |
| |
| req->value = 0; |
| |
| /* Only some caps make sense with UMS/render-only drivers. */ |
| switch (req->capability) { |
| case DRM_CAP_TIMESTAMP_MONOTONIC: |
| req->value = drm_timestamp_monotonic; |
| 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 -ENOTSUPP; |
| |
| 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; |
| |
| 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 -EINVAL; |
| if (req->value > 1) |
| return -EINVAL; |
| file_priv->atomic = req->value; |
| file_priv->universal_planes = 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) && |
| !drm_is_control_client(file_priv))) |
| return -EACCES; |
| |
| /* Control clients must be explicitly allowed */ |
| if (unlikely(!(flags & DRM_CONTROL_ALLOW) && |
| drm_is_control_client(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 \ |
| } |
| |
| /* Ioctl table */ |
| static const struct drm_ioctl_desc drm_ioctls[] = { |
| DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, |
| DRM_UNLOCKED|DRM_RENDER_ALLOW|DRM_CONTROL_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_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_AUTH|DRM_UNLOCKED|DRM_MASTER), |
| |
| DRM_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH), |
| |
| DRM_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_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_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH), |
| DRM_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_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_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH), |
| DRM_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH), |
| |
| DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH), |
| |
| DRM_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH), |
| DRM_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH), |
| DRM_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH), |
| DRM_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH), |
| |
| DRM_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_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), |
| DRM_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_CONTROL_ALLOW|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_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|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_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_mode_connector_property_set_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, DRM_CONTROL_ALLOW|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_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER|DRM_CONTROL_ALLOW|DRM_UNLOCKED), |
| }; |
| |
| #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.txt``. 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); |
| |
| 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); |
| |
| /* Do not trust userspace, use our own definition */ |
| func = ioctl->func; |
| |
| if (unlikely(!func)) { |
| DRM_DEBUG("no function\n"); |
| retcode = -EINVAL; |
| goto err_i1; |
| } |
| |
| if (ksize <= sizeof(stack_kdata)) { |
| kdata = stack_kdata; |
| } else { |
| kdata = kmalloc(ksize, GFP_KERNEL); |
| if (!kdata) { |
| retcode = -ENOMEM; |
| goto err_i1; |
| } |
| } |
| |
| if (copy_from_user(kdata, (void __user *)arg, in_size) != 0) { |
| retcode = -EFAULT; |
| goto err_i1; |
| } |
| |
| if (ksize > in_size) |
| memset(kdata + in_size, 0, ksize - in_size); |
| |
| retcode = drm_ioctl_kernel(filp, func, kdata, ioctl->flags); |
| if (copy_to_user((void __user *)arg, kdata, out_size) != 0) |
| retcode = -EFAULT; |
| |
| err_i1: |
| if (!ioctl) |
| DRM_DEBUG("invalid ioctl: 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); |
| |
| if (kdata != stack_kdata) |
| kfree(kdata); |
| if (retcode) |
| DRM_DEBUG("ret = %d\n", 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); |