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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/gpu/drm/drm_ioctl.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/drm_ioctl.c')
-rw-r--r--drivers/gpu/drm/drm_ioctl.c935
1 files changed, 935 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
new file mode 100644
index 000000000..ca2a6e610
--- /dev/null
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -0,0 +1,935 @@
+/*
+ * 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 <linux/export.h>
+#include <linux/nospec.h>
+#include <linux/pci.h>
+#include <linux/uaccess.h>
+
+#include <drm/drm_auth.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_file.h>
+#include <drm/drm_ioctl.h>
+#include <drm/drm_print.h>
+
+#include "drm_crtc_internal.h"
+#include "drm_internal.h"
+#include "drm_legacy.h"
+
+/**
+ * DOC: getunique and setversion story
+ *
+ * BEWARE THE DRAGONS! MIND THE TRAPDOORS!
+ *
+ * In an attempt to warn anyone else who's trying to figure out what's going
+ * on here, I'll try to summarize the story. First things first, let's clear up
+ * the names, because the kernel internals, libdrm and the ioctls are all named
+ * differently:
+ *
+ * - GET_UNIQUE ioctl, implemented by drm_getunique is wrapped up in libdrm
+ * through the drmGetBusid function.
+ * - The libdrm drmSetBusid function is backed by the SET_UNIQUE ioctl. All
+ * that code is nerved in the kernel with drm_invalid_op().
+ * - The internal set_busid kernel functions and driver callbacks are
+ * exclusively use by the SET_VERSION ioctl, because only drm 1.0 (which is
+ * nerved) allowed userspace to set the busid through the above ioctl.
+ * - Other ioctls and functions involved are named consistently.
+ *
+ * For anyone wondering what's the difference between drm 1.1 and 1.4: Correctly
+ * handling pci domains in the busid on ppc. Doing this correctly was only
+ * implemented in libdrm in 2010, hence can't be nerved yet. No one knows what's
+ * special with drm 1.2 and 1.3.
+ *
+ * Now the actual horror story of how device lookup in drm works. At large,
+ * there's 2 different ways, either by busid, or by device driver name.
+ *
+ * Opening by busid is fairly simple:
+ *
+ * 1. First call SET_VERSION to make sure pci domains are handled properly. As a
+ * side-effect this fills out the unique name in the master structure.
+ * 2. Call GET_UNIQUE to read out the unique name from the master structure,
+ * which matches the busid thanks to step 1. If it doesn't, proceed to try
+ * the next device node.
+ *
+ * Opening by name is slightly different:
+ *
+ * 1. Directly call VERSION to get the version and to match against the driver
+ * name returned by that ioctl. Note that SET_VERSION is not called, which
+ * means the 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;
+
+ mutex_lock(&dev->master_mutex);
+ master = file_priv->master;
+ if (u->unique_len >= master->unique_len) {
+ if (copy_to_user(u->unique, master->unique, master->unique_len)) {
+ mutex_unlock(&dev->master_mutex);
+ return -EFAULT;
+ }
+ }
+ u->unique_len = master->unique_len;
+ mutex_unlock(&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 = 1;
+ return 0;
+ case DRM_CAP_PRIME:
+ req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
+ req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
+ return 0;
+ case DRM_CAP_SYNCOBJ:
+ req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ);
+ return 0;
+ case DRM_CAP_SYNCOBJ_TIMELINE:
+ req->value = drm_core_check_feature(dev, DRIVER_SYNCOBJ_TIMELINE);
+ return 0;
+ }
+
+ /* Other caps only work with KMS drivers */
+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EOPNOTSUPP;
+
+ switch (req->capability) {
+ case DRM_CAP_DUMB_BUFFER:
+ if (dev->driver->dumb_create)
+ req->value = 1;
+ break;
+ case DRM_CAP_VBLANK_HIGH_CRTC:
+ req->value = 1;
+ break;
+ case DRM_CAP_DUMB_PREFERRED_DEPTH:
+ req->value = dev->mode_config.preferred_depth;
+ break;
+ case DRM_CAP_DUMB_PREFER_SHADOW:
+ req->value = dev->mode_config.prefer_shadow;
+ break;
+ case DRM_CAP_ASYNC_PAGE_FLIP:
+ req->value = dev->mode_config.async_page_flip;
+ break;
+ case DRM_CAP_PAGE_FLIP_TARGET:
+ req->value = 1;
+ drm_for_each_crtc(crtc, dev) {
+ if (!crtc->funcs->page_flip_target)
+ req->value = 0;
+ }
+ break;
+ case DRM_CAP_CURSOR_WIDTH:
+ if (dev->mode_config.cursor_width)
+ req->value = dev->mode_config.cursor_width;
+ else
+ req->value = 64;
+ break;
+ case DRM_CAP_CURSOR_HEIGHT:
+ if (dev->mode_config.cursor_height)
+ req->value = dev->mode_config.cursor_height;
+ else
+ req->value = 64;
+ break;
+ case DRM_CAP_ADDFB2_MODIFIERS:
+ req->value = !dev->mode_config.fb_modifiers_not_supported;
+ break;
+ case DRM_CAP_CRTC_IN_VBLANK_EVENT:
+ req->value = 1;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * Set device/driver capabilities
+ */
+static int
+drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+ struct drm_set_client_cap *req = data;
+
+ /* No render-only settable capabilities for now */
+
+ /* Below caps that only works with KMS drivers */
+ if (!drm_core_check_feature(dev, DRIVER_MODESET))
+ return -EOPNOTSUPP;
+
+ switch (req->capability) {
+ case DRM_CLIENT_CAP_STEREO_3D:
+ if (req->value > 1)
+ return -EINVAL;
+ file_priv->stereo_allowed = req->value;
+ break;
+ case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
+ if (req->value > 1)
+ return -EINVAL;
+ file_priv->universal_planes = req->value;
+ break;
+ case DRM_CLIENT_CAP_ATOMIC:
+ if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
+ return -EOPNOTSUPP;
+ /* The modesetting DDX has a totally broken idea of atomic. */
+ if (current->comm[0] == 'X' && req->value == 1) {
+ pr_info("broken atomic modeset userspace detected, disabling atomic\n");
+ return -EOPNOTSUPP;
+ }
+ if (req->value > 2)
+ return -EINVAL;
+ file_priv->atomic = req->value;
+ file_priv->universal_planes = req->value;
+ /*
+ * No atomic user-space blows up on aspect ratio mode bits.
+ */
+ file_priv->aspect_ratio_allowed = req->value;
+ break;
+ case DRM_CLIENT_CAP_ASPECT_RATIO:
+ if (req->value > 1)
+ return -EINVAL;
+ file_priv->aspect_ratio_allowed = req->value;
+ break;
+ case DRM_CLIENT_CAP_WRITEBACK_CONNECTORS:
+ if (!file_priv->atomic)
+ return -EINVAL;
+ if (req->value > 1)
+ return -EINVAL;
+ file_priv->writeback_connectors = req->value;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * Setversion ioctl.
+ *
+ * \param inode device inode.
+ * \param file_priv DRM file private.
+ * \param cmd command.
+ * \param arg user argument, pointing to a drm_lock structure.
+ * \return zero on success or negative number on failure.
+ *
+ * Sets the requested interface version
+ */
+static int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
+{
+ struct drm_set_version *sv = data;
+ int if_version, retcode = 0;
+
+ mutex_lock(&dev->master_mutex);
+ if (sv->drm_di_major != -1) {
+ if (sv->drm_di_major != DRM_IF_MAJOR ||
+ sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
+ retcode = -EINVAL;
+ goto done;
+ }
+ if_version = DRM_IF_VERSION(sv->drm_di_major,
+ sv->drm_di_minor);
+ dev->if_version = max(if_version, dev->if_version);
+ if (sv->drm_di_minor >= 1) {
+ /*
+ * Version 1.1 includes tying of DRM to specific device
+ * Version 1.4 has proper PCI domain support
+ */
+ retcode = drm_set_busid(dev, file_priv);
+ if (retcode)
+ goto done;
+ }
+ }
+
+ if (sv->drm_dd_major != -1) {
+ if (sv->drm_dd_major != dev->driver->major ||
+ sv->drm_dd_minor < 0 || sv->drm_dd_minor >
+ dev->driver->minor) {
+ retcode = -EINVAL;
+ goto done;
+ }
+ }
+
+done:
+ sv->drm_di_major = DRM_IF_MAJOR;
+ sv->drm_di_minor = DRM_IF_MINOR;
+ sv->drm_dd_major = dev->driver->major;
+ sv->drm_dd_minor = dev->driver->minor;
+ mutex_unlock(&dev->master_mutex);
+
+ return retcode;
+}
+
+/**
+ * drm_noop - DRM no-op ioctl implementation
+ * @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 implementation
+ * @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)
+{
+ size_t len;
+
+ /* don't attempt to copy a NULL pointer */
+ if (WARN_ONCE(!value, "BUG: the value to copy was not set!")) {
+ *buf_len = 0;
+ return 0;
+ }
+
+ /* 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;
+}
+
+static int drm_ioctl_permit(u32 flags, struct drm_file *file_priv)
+{
+ /* ROOT_ONLY is only for CAP_SYS_ADMIN */
+ if (unlikely((flags & DRM_ROOT_ONLY) && !capable(CAP_SYS_ADMIN)))
+ return -EACCES;
+
+ /* AUTH is only for authenticated or render client */
+ if (unlikely((flags & DRM_AUTH) && !drm_is_render_client(file_priv) &&
+ !file_priv->authenticated))
+ return -EACCES;
+
+ /* MASTER is only for master or control clients */
+ if (unlikely((flags & DRM_MASTER) &&
+ !drm_is_current_master(file_priv)))
+ return -EACCES;
+
+ /* Render clients must be explicitly allowed */
+ if (unlikely(!(flags & DRM_RENDER_ALLOW) &&
+ drm_is_render_client(file_priv)))
+ return -EACCES;
+
+ return 0;
+}
+
+#define DRM_IOCTL_DEF(ioctl, _func, _flags) \
+ [DRM_IOCTL_NR(ioctl)] = { \
+ .cmd = ioctl, \
+ .func = _func, \
+ .flags = _flags, \
+ .name = #ioctl \
+ }
+
+#if IS_ENABLED(CONFIG_DRM_LEGACY)
+#define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, _func, _flags)
+#else
+#define DRM_LEGACY_IOCTL_DEF(ioctl, _func, _flags) DRM_IOCTL_DEF(ioctl, drm_invalid_op, _flags)
+#endif
+
+/* Ioctl table */
+static const struct drm_ioctl_desc drm_ioctls[] = {
+ DRM_IOCTL_DEF(DRM_IOCTL_VERSION, drm_version, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_GET_UNIQUE, drm_getunique, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_GET_MAGIC, drm_getmagic, 0),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_IRQ_BUSID, drm_legacy_irq_by_busid,
+ DRM_MASTER|DRM_ROOT_ONLY),
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_MAP, drm_legacy_getmap_ioctl, 0),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_GET_CLIENT, drm_getclient, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_GET_STATS, drm_getstats, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_GET_CAP, drm_getcap, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SET_CLIENT_CAP, drm_setclientcap, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_SET_VERSION, drm_setversion, 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_MASTER),
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_MAP, drm_legacy_addmap_ioctl, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_MAP, drm_legacy_rmmap_ioctl, DRM_AUTH),
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SET_SAREA_CTX, drm_legacy_setsareactx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_SAREA_CTX, drm_legacy_getsareactx, DRM_AUTH),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_SET_MASTER, drm_setmaster_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_DROP_MASTER, drm_dropmaster_ioctl, 0),
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_CTX, drm_legacy_addctx, DRM_AUTH|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RM_CTX, drm_legacy_rmctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MOD_CTX, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_GET_CTX, drm_legacy_getctx, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SWITCH_CTX, drm_legacy_switchctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_NEW_CTX, drm_legacy_newctx, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_RES_CTX, drm_legacy_resctx, DRM_AUTH),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_ADD_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_IOCTL_DEF(DRM_IOCTL_RM_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_LOCK, drm_legacy_lock, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_UNLOCK, drm_legacy_unlock, DRM_AUTH),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_FINISH, drm_noop, DRM_AUTH),
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_ADD_BUFS, drm_legacy_addbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MARK_BUFS, drm_legacy_markbufs, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_INFO_BUFS, drm_legacy_infobufs, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_MAP_BUFS, drm_legacy_mapbufs, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_FREE_BUFS, drm_legacy_freebufs, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_DMA, drm_legacy_dma_ioctl, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_CONTROL, drm_legacy_irq_control, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+#if IS_ENABLED(CONFIG_AGP)
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ACQUIRE, drm_legacy_agp_acquire_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_RELEASE, drm_legacy_agp_release_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ENABLE, drm_legacy_agp_enable_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_INFO, drm_legacy_agp_info_ioctl, DRM_AUTH),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_ALLOC, drm_legacy_agp_alloc_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_FREE, drm_legacy_agp_free_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_BIND, drm_legacy_agp_bind_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_AGP_UNBIND, drm_legacy_agp_unbind_ioctl,
+ DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+#endif
+
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_ALLOC, drm_legacy_sg_alloc, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+ DRM_LEGACY_IOCTL_DEF(DRM_IOCTL_SG_FREE, drm_legacy_sg_free, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_WAIT_VBLANK, drm_wait_vblank_ioctl, DRM_UNLOCKED),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_MODESET_CTL, drm_legacy_modeset_ctl_ioctl, 0),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_UPDATE_DRAW, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_GEM_CLOSE, drm_gem_close_ioctl, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_GEM_FLINK, drm_gem_flink_ioctl, DRM_AUTH),
+ DRM_IOCTL_DEF(DRM_IOCTL_GEM_OPEN, drm_gem_open_ioctl, DRM_AUTH),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETRESOURCES, drm_mode_getresources, 0),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_PRIME_HANDLE_TO_FD, drm_prime_handle_to_fd_ioctl, DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_PRIME_FD_TO_HANDLE, drm_prime_fd_to_handle_ioctl, DRM_RENDER_ALLOW),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANERESOURCES, drm_mode_getplane_res, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCRTC, drm_mode_getcrtc, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETCRTC, drm_mode_setcrtc, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPLANE, drm_mode_getplane, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPLANE, drm_mode_setplane, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR, drm_mode_cursor_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETGAMMA, drm_mode_gamma_get_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETGAMMA, drm_mode_gamma_set_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETENCODER, drm_mode_getencoder, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETCONNECTOR, drm_mode_getconnector, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATTACHMODE, drm_noop, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_DETACHMODE, drm_noop, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPERTY, drm_mode_getproperty_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_SETPROPERTY, drm_connector_property_set_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETPROPBLOB, drm_mode_getblob_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB, drm_mode_getfb, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GETFB2, drm_mode_getfb2_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB, drm_mode_addfb_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_ADDFB2, drm_mode_addfb2_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_RMFB, drm_mode_rmfb_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_PAGE_FLIP, drm_mode_page_flip_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_DIRTYFB, drm_mode_dirtyfb_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_DUMB, drm_mode_create_dumb_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_MAP_DUMB, drm_mode_mmap_dumb_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROY_DUMB, drm_mode_destroy_dumb_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_GETPROPERTIES, drm_mode_obj_get_properties_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_OBJ_SETPROPERTY, drm_mode_obj_set_property_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_CURSOR2, drm_mode_cursor2_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_ATOMIC, drm_mode_atomic_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATEPROPBLOB, drm_mode_createblob_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_DESTROYPROPBLOB, drm_mode_destroyblob_ioctl, 0),
+
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_CREATE, drm_syncobj_create_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_DESTROY, drm_syncobj_destroy_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_HANDLE_TO_FD, drm_syncobj_handle_to_fd_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_FD_TO_HANDLE, drm_syncobj_fd_to_handle_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TRANSFER, drm_syncobj_transfer_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_WAIT, drm_syncobj_wait_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT, drm_syncobj_timeline_wait_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_TIMELINE_SIGNAL, drm_syncobj_timeline_signal_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_QUERY, drm_syncobj_query_ioctl,
+ DRM_RENDER_ALLOW),
+ DRM_IOCTL_DEF(DRM_IOCTL_CRTC_GET_SEQUENCE, drm_crtc_get_sequence_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_CRTC_QUEUE_SEQUENCE, drm_crtc_queue_sequence_ioctl, 0),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_CREATE_LEASE, drm_mode_create_lease_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_LIST_LESSEES, drm_mode_list_lessees_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_GET_LEASE, drm_mode_get_lease_ioctl, DRM_MASTER),
+ DRM_IOCTL_DEF(DRM_IOCTL_MODE_REVOKE_LEASE, drm_mode_revoke_lease_ioctl, DRM_MASTER),
+};
+
+#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/process/botching-up-ioctls.rst``. Note that drm_ioctl()
+ * automatically zero-extends structures, hence make sure you can add more stuff
+ * at the end, i.e. don't put a variable sized array there.
+ *
+ * Then you need to define your IOCTL number, using one of DRM_IO(), DRM_IOR(),
+ * DRM_IOW() or DRM_IOWR(). It must start with the DRM_IOCTL\_ prefix::
+ *
+ * ##define DRM_IOCTL_MY_DRIVER_OPERATION \
+ * DRM_IOW(DRM_COMMAND_BASE, struct my_driver_operation)
+ *
+ * DRM driver private IOCTL must be in the range from DRM_COMMAND_BASE to
+ * DRM_COMMAND_END. Finally you need an array of &struct drm_ioctl_desc to wire
+ * up the handlers and set the access rights::
+ *
+ * static const struct drm_ioctl_desc my_driver_ioctls[] = {
+ * DRM_IOCTL_DEF_DRV(MY_DRIVER_OPERATION, my_driver_operation,
+ * DRM_AUTH|DRM_RENDER_ALLOW),
+ * };
+ *
+ * And then assign this to the &drm_driver.ioctls field in your driver
+ * structure.
+ *
+ * See the separate chapter on :ref:`file operations<drm_driver_fops>` for how
+ * the driver-specific IOCTLs are wired up.
+ */
+
+long drm_ioctl_kernel(struct file *file, drm_ioctl_t *func, void *kdata,
+ u32 flags)
+{
+ struct drm_file *file_priv = file->private_data;
+ struct drm_device *dev = file_priv->minor->dev;
+ int retcode;
+
+ if (drm_dev_is_unplugged(dev))
+ return -ENODEV;
+
+ retcode = drm_ioctl_permit(flags, file_priv);
+ if (unlikely(retcode))
+ return retcode;
+
+ /* Enforce sane locking for modern driver ioctls. */
+ if (likely(!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;
+
+ if (DRM_IOCTL_TYPE(cmd) != DRM_IOCTL_BASE)
+ return -ENOTTY;
+
+ 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("comm=\"%s\" pid=%d, dev=0x%lx, auth=%d, %s\n",
+ current->comm, 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: comm=\"%s\", pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
+ current->comm, 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("comm=\"%s\", pid=%d, ret=%d\n", current->comm,
+ task_pid_nr(current), retcode);
+ return retcode;
+}
+EXPORT_SYMBOL(drm_ioctl);
+
+/**
+ * drm_ioctl_flags - Check for core ioctl and return ioctl permission flags
+ * @nr: ioctl number
+ * @flags: where to return the ioctl permission flags
+ *
+ * This ioctl is only used by the vmwgfx driver to augment the access checks
+ * done by the drm core and insofar a pretty decent layering violation. This
+ * shouldn't be used by any drivers.
+ *
+ * Returns:
+ * True if the @nr corresponds to a DRM core ioctl number, false otherwise.
+ */
+bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
+{
+ if (nr >= DRM_COMMAND_BASE && nr < DRM_COMMAND_END)
+ return false;
+
+ if (nr >= DRM_CORE_IOCTL_COUNT)
+ return false;
+ nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
+
+ *flags = drm_ioctls[nr].flags;
+ return true;
+}
+EXPORT_SYMBOL(drm_ioctl_flags);