/* * 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" /** * 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 voiddrm_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 = DRM_PRIME_CAP_IMPORT | DRM_PRIME_CAP_EXPORT; 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; case DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP: req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) && dev->mode_config.async_page_flip; break; default: return -EINVAL; } return 0;} /* * Set device/driver capabilities */static intdrm_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; case DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT: if (!drm_core_check_feature(dev, DRIVER_CURSOR_HOTSPOT)) return -EOPNOTSUPP; if (!file_priv->atomic) return -EINVAL; if (req->value > 1) return -EINVAL; file_priv->supports_virtualized_cursor_plane = req->value; break; case DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE: { struct drm_plane *plane; bool has_plane_with_color_pipeline = false; if (!file_priv->atomic) return -EINVAL; if (req->value > 1) return -EINVAL; drm_for_each_plane(plane, dev) { if (plane->color_pipeline_property) { has_plane_with_color_pipeline = true; break; } } if (!has_plane_with_color_pipeline) return -EOPNOTSUPP; file_priv->plane_color_pipeline = 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_dbg_core(dev, "\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); /*Lines 1–500 of 959. Load more
/* * 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" /** * 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 = DRM_PRIME_CAP_IMPORT | DRM_PRIME_CAP_EXPORT; 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; case DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP: req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) && dev->mode_config.async_page_flip; 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; case DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT: if (!drm_core_check_feature(dev, DRIVER_CURSOR_HOTSPOT)) return -EOPNOTSUPP; if (!file_priv->atomic) return -EINVAL; if (req->value > 1) return -EINVAL; file_priv->supports_virtualized_cursor_plane = req->value; break; case DRM_CLIENT_CAP_PLANE_COLOR_PIPELINE: { struct drm_plane *plane; bool has_plane_with_color_pipeline = false; if (!file_priv->atomic) return -EINVAL; if (req->value > 1) return -EINVAL; drm_for_each_plane(plane, dev) { if (plane->color_pipeline_property) { has_plane_with_color_pipeline = true; break; } } if (!has_plane_with_color_pipeline) return -EOPNOTSUPP; file_priv->plane_color_pipeline = 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_dbg_core(dev, "\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); /*