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![Thierry Reding](/assets/img/avatar_default.png)
Add a helper function that allows drivers to statically set the unique name of the device. This will allow platform and USB drivers to get rid of their DRM bus implementations and directly use drm_dev_alloc() and drm_dev_register(). Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reviewed-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
419 lines
10 KiB
C
419 lines
10 KiB
C
/**
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* \file drm_ioctl.c
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* IOCTL processing for DRM
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*
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* \author Rickard E. (Rik) Faith <faith@valinux.com>
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* \author Gareth Hughes <gareth@valinux.com>
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*/
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/*
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* Created: Fri Jan 8 09:01:26 1999 by faith@valinux.com
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*
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* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
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* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_core.h>
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#include <linux/pci.h>
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#include <linux/export.h>
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#ifdef CONFIG_X86
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#include <asm/mtrr.h>
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#endif
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/**
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* Get the bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_unique structure.
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* \return zero on success or a negative number on failure.
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*
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* Copies the bus id from drm_device::unique into user space.
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*/
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int drm_getunique(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_unique *u = data;
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struct drm_master *master = file_priv->master;
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if (u->unique_len >= master->unique_len) {
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if (copy_to_user(u->unique, master->unique, master->unique_len))
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return -EFAULT;
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}
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u->unique_len = master->unique_len;
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return 0;
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}
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static void
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drm_unset_busid(struct drm_device *dev,
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struct drm_master *master)
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{
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kfree(master->unique);
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master->unique = NULL;
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master->unique_len = 0;
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master->unique_size = 0;
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}
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/**
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* Set the bus id.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_unique structure.
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* \return zero on success or a negative number on failure.
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*
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* Copies the bus id from userspace into drm_device::unique, and verifies that
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* it matches the device this DRM is attached to (EINVAL otherwise). Deprecated
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* in interface version 1.1 and will return EBUSY when setversion has requested
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* version 1.1 or greater. Also note that KMS is all version 1.1 and later and
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* UMS was only ever supported on pci devices.
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*/
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int drm_setunique(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_unique *u = data;
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struct drm_master *master = file_priv->master;
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int ret;
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if (master->unique_len || master->unique)
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return -EBUSY;
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if (!u->unique_len || u->unique_len > 1024)
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return -EINVAL;
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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return 0;
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if (WARN_ON(!dev->pdev))
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return -EINVAL;
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ret = drm_pci_set_unique(dev, master, u);
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if (ret)
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goto err;
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return 0;
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err:
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drm_unset_busid(dev, master);
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return ret;
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}
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static int drm_set_busid(struct drm_device *dev, struct drm_file *file_priv)
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{
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struct drm_master *master = file_priv->master;
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int ret;
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if (master->unique != NULL)
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drm_unset_busid(dev, master);
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if (dev->driver->bus && dev->driver->bus->set_busid) {
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ret = dev->driver->bus->set_busid(dev, master);
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if (ret) {
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drm_unset_busid(dev, master);
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return ret;
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}
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} else {
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if (WARN(dev->unique == NULL,
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"No drm_bus.set_busid() implementation provided by "
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"%ps. Use drm_dev_set_unique() to set the unique "
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"name explicitly.", dev->driver))
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return -EINVAL;
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master->unique = kstrdup(dev->unique, GFP_KERNEL);
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if (master->unique)
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master->unique_len = strlen(dev->unique);
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}
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return 0;
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}
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/**
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* Get a mapping information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_map structure.
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*
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* \return zero on success or a negative number on failure.
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*
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* Searches for the mapping with the specified offset and copies its information
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* into userspace
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*/
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int drm_getmap(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_map *map = data;
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struct drm_map_list *r_list = NULL;
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struct list_head *list;
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int idx;
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int i;
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idx = map->offset;
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if (idx < 0)
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return -EINVAL;
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i = 0;
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mutex_lock(&dev->struct_mutex);
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list_for_each(list, &dev->maplist) {
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if (i == idx) {
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r_list = list_entry(list, struct drm_map_list, head);
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break;
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}
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i++;
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}
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if (!r_list || !r_list->map) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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map->offset = r_list->map->offset;
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map->size = r_list->map->size;
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map->type = r_list->map->type;
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map->flags = r_list->map->flags;
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map->handle = (void *)(unsigned long) r_list->user_token;
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#ifdef CONFIG_X86
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/*
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* There appears to be exactly one user of the mtrr index: dritest.
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* It's easy enough to keep it working on non-PAT systems.
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*/
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map->mtrr = phys_wc_to_mtrr_index(r_list->map->mtrr);
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#else
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map->mtrr = -1;
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#endif
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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/**
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* Get client information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_client structure.
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*
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* \return zero on success or a negative number on failure.
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*
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* Searches for the client with the specified index and copies its information
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* into userspace
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*/
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int drm_getclient(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_client *client = data;
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/*
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* Hollowed-out getclient ioctl to keep some dead old drm tests/tools
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* not breaking completely. Userspace tools stop enumerating one they
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* get -EINVAL, hence this is the return value we need to hand back for
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* no clients tracked.
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*
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* Unfortunately some clients (*cough* libva *cough*) use this in a fun
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* attempt to figure out whether they're authenticated or not. Since
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* that's the only thing they care about, give it to the directly
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* instead of walking one giant list.
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*/
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if (client->idx == 0) {
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client->auth = file_priv->authenticated;
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client->pid = pid_vnr(file_priv->pid);
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client->uid = from_kuid_munged(current_user_ns(),
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file_priv->uid);
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client->magic = 0;
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client->iocs = 0;
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return 0;
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} else {
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return -EINVAL;
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}
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}
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/**
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* Get statistics information.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_stats structure.
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*
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* \return zero on success or a negative number on failure.
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*/
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int drm_getstats(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_stats *stats = data;
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/* Clear stats to prevent userspace from eating its stack garbage. */
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memset(stats, 0, sizeof(*stats));
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return 0;
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}
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/**
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* Get device/driver capabilities
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*/
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int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_get_cap *req = data;
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req->value = 0;
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switch (req->capability) {
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case DRM_CAP_DUMB_BUFFER:
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if (dev->driver->dumb_create)
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req->value = 1;
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break;
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case DRM_CAP_VBLANK_HIGH_CRTC:
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req->value = 1;
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break;
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case DRM_CAP_DUMB_PREFERRED_DEPTH:
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req->value = dev->mode_config.preferred_depth;
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break;
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case DRM_CAP_DUMB_PREFER_SHADOW:
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req->value = dev->mode_config.prefer_shadow;
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break;
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case DRM_CAP_PRIME:
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req->value |= dev->driver->prime_fd_to_handle ? DRM_PRIME_CAP_IMPORT : 0;
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req->value |= dev->driver->prime_handle_to_fd ? DRM_PRIME_CAP_EXPORT : 0;
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break;
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case DRM_CAP_TIMESTAMP_MONOTONIC:
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req->value = drm_timestamp_monotonic;
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break;
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case DRM_CAP_ASYNC_PAGE_FLIP:
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req->value = dev->mode_config.async_page_flip;
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break;
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case DRM_CAP_CURSOR_WIDTH:
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if (dev->mode_config.cursor_width)
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req->value = dev->mode_config.cursor_width;
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else
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req->value = 64;
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break;
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case DRM_CAP_CURSOR_HEIGHT:
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if (dev->mode_config.cursor_height)
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req->value = dev->mode_config.cursor_height;
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else
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req->value = 64;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/**
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* Set device/driver capabilities
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*/
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int
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drm_setclientcap(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_set_client_cap *req = data;
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switch (req->capability) {
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case DRM_CLIENT_CAP_STEREO_3D:
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if (req->value > 1)
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return -EINVAL;
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file_priv->stereo_allowed = req->value;
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break;
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case DRM_CLIENT_CAP_UNIVERSAL_PLANES:
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if (!drm_universal_planes)
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return -EINVAL;
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if (req->value > 1)
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return -EINVAL;
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file_priv->universal_planes = req->value;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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/**
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* Setversion ioctl.
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*
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* \param inode device inode.
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* \param file_priv DRM file private.
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* \param cmd command.
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* \param arg user argument, pointing to a drm_lock structure.
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* \return zero on success or negative number on failure.
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*
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* Sets the requested interface version
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*/
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int drm_setversion(struct drm_device *dev, void *data, struct drm_file *file_priv)
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{
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struct drm_set_version *sv = data;
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int if_version, retcode = 0;
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if (sv->drm_di_major != -1) {
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if (sv->drm_di_major != DRM_IF_MAJOR ||
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sv->drm_di_minor < 0 || sv->drm_di_minor > DRM_IF_MINOR) {
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retcode = -EINVAL;
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goto done;
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}
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if_version = DRM_IF_VERSION(sv->drm_di_major,
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sv->drm_di_minor);
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dev->if_version = max(if_version, dev->if_version);
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if (sv->drm_di_minor >= 1) {
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/*
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* Version 1.1 includes tying of DRM to specific device
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* Version 1.4 has proper PCI domain support
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*/
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retcode = drm_set_busid(dev, file_priv);
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if (retcode)
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goto done;
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}
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}
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if (sv->drm_dd_major != -1) {
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if (sv->drm_dd_major != dev->driver->major ||
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sv->drm_dd_minor < 0 || sv->drm_dd_minor >
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dev->driver->minor) {
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retcode = -EINVAL;
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goto done;
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}
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}
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done:
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sv->drm_di_major = DRM_IF_MAJOR;
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sv->drm_di_minor = DRM_IF_MINOR;
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sv->drm_dd_major = dev->driver->major;
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sv->drm_dd_minor = dev->driver->minor;
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return retcode;
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}
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/** No-op ioctl. */
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int drm_noop(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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DRM_DEBUG("\n");
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return 0;
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}
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EXPORT_SYMBOL(drm_noop);
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