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![Thomas Zimmermann](/assets/img/avatar_default.png)
Remove nouveau's support for legacy contexts and buffers. It was required by libdrm earlier than 2.4.33, released in March 2012. A previous attempt in 2013 to remove the functionality [1] had to be reverted [2] as there were still users left. Libdrm 2.4.33 is now almost 11 years old and it is time for userspace to move on. With the nouveau code gone, we can also remove the driver-feature bit DRIVER_KMS_LEGACY_CONTEXT. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Karol Herbst <kherbst@redhat.com> Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7c510133d93dd6f15ca040733ba7b2891ed61fd1 # 1 Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c21eb21cb50d58e7cbdcb8b9e7ff68b85cfa5095 # 2 Link: https://patchwork.freedesktop.org/patch/msgid/20230112133858.17087-1-tzimmermann@suse.de
513 lines
13 KiB
C
513 lines
13 KiB
C
/*
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* Legacy: Generic DRM Contexts
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*
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* Copyright 1999, 2000 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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* 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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* 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 <linux/slab.h>
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#include <linux/uaccess.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_print.h>
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#include "drm_legacy.h"
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struct drm_ctx_list {
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struct list_head head;
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drm_context_t handle;
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struct drm_file *tag;
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};
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/******************************************************************/
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/** \name Context bitmap support */
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/*@{*/
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/*
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* Free a handle from the context bitmap.
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*
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* \param dev DRM device.
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* \param ctx_handle context handle.
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*
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* Clears the bit specified by \p ctx_handle in drm_device::ctx_bitmap and the entry
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* in drm_device::ctx_idr, while holding the drm_device::struct_mutex
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* lock.
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*/
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void drm_legacy_ctxbitmap_free(struct drm_device * dev, int ctx_handle)
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{
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return;
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mutex_lock(&dev->struct_mutex);
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idr_remove(&dev->ctx_idr, ctx_handle);
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mutex_unlock(&dev->struct_mutex);
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}
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/*
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* Context bitmap allocation.
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*
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* \param dev DRM device.
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* \return (non-negative) context handle on success or a negative number on failure.
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*
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* Allocate a new idr from drm_device::ctx_idr while holding the
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* drm_device::struct_mutex lock.
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*/
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static int drm_legacy_ctxbitmap_next(struct drm_device * dev)
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{
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int ret;
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mutex_lock(&dev->struct_mutex);
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ret = idr_alloc(&dev->ctx_idr, NULL, DRM_RESERVED_CONTEXTS, 0,
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GFP_KERNEL);
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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/*
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* Context bitmap initialization.
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*
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* \param dev DRM device.
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*
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* Initialise the drm_device::ctx_idr
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*/
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void drm_legacy_ctxbitmap_init(struct drm_device * dev)
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{
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return;
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idr_init(&dev->ctx_idr);
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}
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/*
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* Context bitmap cleanup.
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*
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* \param dev DRM device.
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*
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* Free all idr members using drm_ctx_sarea_free helper function
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* while holding the drm_device::struct_mutex lock.
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*/
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void drm_legacy_ctxbitmap_cleanup(struct drm_device * dev)
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{
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return;
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mutex_lock(&dev->struct_mutex);
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idr_destroy(&dev->ctx_idr);
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mutex_unlock(&dev->struct_mutex);
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}
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/**
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* drm_legacy_ctxbitmap_flush() - Flush all contexts owned by a file
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* @dev: DRM device to operate on
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* @file: Open file to flush contexts for
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*
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* This iterates over all contexts on @dev and drops them if they're owned by
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* @file. Note that after this call returns, new contexts might be added if
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* the file is still alive.
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*/
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void drm_legacy_ctxbitmap_flush(struct drm_device *dev, struct drm_file *file)
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{
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struct drm_ctx_list *pos, *tmp;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return;
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mutex_lock(&dev->ctxlist_mutex);
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list_for_each_entry_safe(pos, tmp, &dev->ctxlist, head) {
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if (pos->tag == file &&
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pos->handle != DRM_KERNEL_CONTEXT) {
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if (dev->driver->context_dtor)
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dev->driver->context_dtor(dev, pos->handle);
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drm_legacy_ctxbitmap_free(dev, pos->handle);
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list_del(&pos->head);
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kfree(pos);
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}
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}
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mutex_unlock(&dev->ctxlist_mutex);
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}
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/*@}*/
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/******************************************************************/
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/** \name Per Context SAREA Support */
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/*@{*/
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/*
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* Get per-context SAREA.
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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_ctx_priv_map structure.
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* \return zero on success or a negative number on failure.
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*
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* Gets the map from drm_device::ctx_idr with the handle specified and
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* returns its handle.
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*/
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int drm_legacy_getsareactx(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_ctx_priv_map *request = data;
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struct drm_local_map *map;
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struct drm_map_list *_entry;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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mutex_lock(&dev->struct_mutex);
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map = idr_find(&dev->ctx_idr, request->ctx_id);
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if (!map) {
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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request->handle = NULL;
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list_for_each_entry(_entry, &dev->maplist, head) {
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if (_entry->map == map) {
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request->handle =
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(void *)(unsigned long)_entry->user_token;
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break;
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}
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}
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mutex_unlock(&dev->struct_mutex);
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if (request->handle == NULL)
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return -EINVAL;
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return 0;
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}
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/*
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* Set per-context SAREA.
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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_ctx_priv_map structure.
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* \return zero on success or a negative number on failure.
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*
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* Searches the mapping specified in \p arg and update the entry in
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* drm_device::ctx_idr with it.
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*/
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int drm_legacy_setsareactx(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_ctx_priv_map *request = data;
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struct drm_local_map *map = NULL;
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struct drm_map_list *r_list = NULL;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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mutex_lock(&dev->struct_mutex);
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list_for_each_entry(r_list, &dev->maplist, head) {
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if (r_list->map
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&& r_list->user_token == (unsigned long) request->handle)
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goto found;
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}
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bad:
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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found:
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map = r_list->map;
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if (!map)
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goto bad;
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if (IS_ERR(idr_replace(&dev->ctx_idr, map, request->ctx_id)))
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goto bad;
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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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/******************************************************************/
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/** \name The actual DRM context handling routines */
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/*@{*/
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/*
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* Switch context.
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*
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* \param dev DRM device.
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* \param old old context handle.
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* \param new new context handle.
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* \return zero on success or a negative number on failure.
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*
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* Attempt to set drm_device::context_flag.
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*/
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static int drm_context_switch(struct drm_device * dev, int old, int new)
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{
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if (test_and_set_bit(0, &dev->context_flag)) {
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DRM_ERROR("Reentering -- FIXME\n");
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return -EBUSY;
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}
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DRM_DEBUG("Context switch from %d to %d\n", old, new);
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if (new == dev->last_context) {
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clear_bit(0, &dev->context_flag);
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return 0;
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}
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return 0;
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}
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/*
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* Complete context switch.
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*
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* \param dev DRM device.
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* \param new new context handle.
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* \return zero on success or a negative number on failure.
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*
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* Updates drm_device::last_context and drm_device::last_switch. Verifies the
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* hardware lock is held, clears the drm_device::context_flag and wakes up
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* drm_device::context_wait.
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*/
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static int drm_context_switch_complete(struct drm_device *dev,
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struct drm_file *file_priv, int new)
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{
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dev->last_context = new; /* PRE/POST: This is the _only_ writer. */
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if (!_DRM_LOCK_IS_HELD(file_priv->master->lock.hw_lock->lock)) {
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DRM_ERROR("Lock isn't held after context switch\n");
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}
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/* If a context switch is ever initiated
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when the kernel holds the lock, release
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that lock here.
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*/
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clear_bit(0, &dev->context_flag);
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return 0;
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}
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/*
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* Reserve contexts.
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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_ctx_res structure.
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* \return zero on success or a negative number on failure.
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*/
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int drm_legacy_resctx(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_ctx_res *res = data;
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struct drm_ctx ctx;
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int i;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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if (res->count >= DRM_RESERVED_CONTEXTS) {
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memset(&ctx, 0, sizeof(ctx));
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for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
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ctx.handle = i;
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if (copy_to_user(&res->contexts[i], &ctx, sizeof(ctx)))
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return -EFAULT;
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}
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}
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res->count = DRM_RESERVED_CONTEXTS;
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return 0;
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}
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/*
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* Add context.
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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_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* Get a new handle for the context and copy to userspace.
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*/
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int drm_legacy_addctx(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_ctx_list *ctx_entry;
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struct drm_ctx *ctx = data;
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int tmp_handle;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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tmp_handle = drm_legacy_ctxbitmap_next(dev);
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if (tmp_handle == DRM_KERNEL_CONTEXT) {
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/* Skip kernel's context and get a new one. */
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tmp_handle = drm_legacy_ctxbitmap_next(dev);
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}
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DRM_DEBUG("%d\n", tmp_handle);
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if (tmp_handle < 0) {
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DRM_DEBUG("Not enough free contexts.\n");
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/* Should this return -EBUSY instead? */
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return tmp_handle;
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}
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ctx->handle = tmp_handle;
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ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
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if (!ctx_entry) {
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DRM_DEBUG("out of memory\n");
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return -ENOMEM;
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}
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INIT_LIST_HEAD(&ctx_entry->head);
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ctx_entry->handle = ctx->handle;
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ctx_entry->tag = file_priv;
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mutex_lock(&dev->ctxlist_mutex);
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list_add(&ctx_entry->head, &dev->ctxlist);
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mutex_unlock(&dev->ctxlist_mutex);
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return 0;
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}
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/*
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* Get context.
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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_ctx structure.
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* \return zero on success or a negative number on failure.
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*/
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int drm_legacy_getctx(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_ctx *ctx = data;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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/* This is 0, because we don't handle any context flags */
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ctx->flags = 0;
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return 0;
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}
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/*
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* Switch context.
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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_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* Calls context_switch().
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*/
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int drm_legacy_switchctx(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_ctx *ctx = data;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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DRM_DEBUG("%d\n", ctx->handle);
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return drm_context_switch(dev, dev->last_context, ctx->handle);
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}
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/*
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* New context.
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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_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* Calls context_switch_complete().
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*/
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int drm_legacy_newctx(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_ctx *ctx = data;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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DRM_DEBUG("%d\n", ctx->handle);
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drm_context_switch_complete(dev, file_priv, ctx->handle);
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return 0;
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}
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/*
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* Remove context.
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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_ctx structure.
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* \return zero on success or a negative number on failure.
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*
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* If not the special kernel context, calls ctxbitmap_free() to free the specified context.
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*/
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int drm_legacy_rmctx(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_ctx *ctx = data;
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if (!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EOPNOTSUPP;
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DRM_DEBUG("%d\n", ctx->handle);
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if (ctx->handle != DRM_KERNEL_CONTEXT) {
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if (dev->driver->context_dtor)
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dev->driver->context_dtor(dev, ctx->handle);
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drm_legacy_ctxbitmap_free(dev, ctx->handle);
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}
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mutex_lock(&dev->ctxlist_mutex);
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if (!list_empty(&dev->ctxlist)) {
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struct drm_ctx_list *pos, *n;
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list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
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if (pos->handle == ctx->handle) {
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list_del(&pos->head);
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kfree(pos);
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}
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}
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}
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mutex_unlock(&dev->ctxlist_mutex);
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return 0;
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}
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/*@}*/
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