516 lines
13 KiB
C
516 lines
13 KiB
C
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/*
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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 <drm/drmP.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_KMS_LEGACY_CONTEXT) &&
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!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_KMS_LEGACY_CONTEXT) &&
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!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_KMS_LEGACY_CONTEXT) &&
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!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_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_KMS_LEGACY_CONTEXT) &&
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!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_KMS_LEGACY_CONTEXT) &&
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!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EINVAL;
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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_KMS_LEGACY_CONTEXT) &&
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!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EINVAL;
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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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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_KMS_LEGACY_CONTEXT) &&
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!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EINVAL;
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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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if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
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!drm_core_check_feature(dev, DRIVER_LEGACY))
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return -EINVAL;
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ctx->handle = drm_legacy_ctxbitmap_next(dev);
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if (ctx->handle == DRM_KERNEL_CONTEXT) {
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/* Skip kernel's context and get a new one. */
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ctx->handle = drm_legacy_ctxbitmap_next(dev);
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}
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DRM_DEBUG("%d\n", ctx->handle);
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if (ctx->handle == -1) {
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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 -ENOMEM;
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}
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ctx_entry = kmalloc(sizeof(*ctx_entry), GFP_KERNEL);
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|
if (!ctx_entry) {
|
||
|
|
DRM_DEBUG("out of memory\n");
|
||
|
|
return -ENOMEM;
|
||
|
|
}
|
||
|
|
|
||
|
|
INIT_LIST_HEAD(&ctx_entry->head);
|
||
|
|
ctx_entry->handle = ctx->handle;
|
||
|
|
ctx_entry->tag = file_priv;
|
||
|
|
|
||
|
|
mutex_lock(&dev->ctxlist_mutex);
|
||
|
|
list_add(&ctx_entry->head, &dev->ctxlist);
|
||
|
|
mutex_unlock(&dev->ctxlist_mutex);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Get context.
|
||
|
|
*
|
||
|
|
* \param inode device inode.
|
||
|
|
* \param file_priv DRM file private.
|
||
|
|
* \param cmd command.
|
||
|
|
* \param arg user argument pointing to a drm_ctx structure.
|
||
|
|
* \return zero on success or a negative number on failure.
|
||
|
|
*/
|
||
|
|
int drm_legacy_getctx(struct drm_device *dev, void *data,
|
||
|
|
struct drm_file *file_priv)
|
||
|
|
{
|
||
|
|
struct drm_ctx *ctx = data;
|
||
|
|
|
||
|
|
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
|
||
|
|
!drm_core_check_feature(dev, DRIVER_LEGACY))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
/* This is 0, because we don't handle any context flags */
|
||
|
|
ctx->flags = 0;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Switch context.
|
||
|
|
*
|
||
|
|
* \param inode device inode.
|
||
|
|
* \param file_priv DRM file private.
|
||
|
|
* \param cmd command.
|
||
|
|
* \param arg user argument pointing to a drm_ctx structure.
|
||
|
|
* \return zero on success or a negative number on failure.
|
||
|
|
*
|
||
|
|
* Calls context_switch().
|
||
|
|
*/
|
||
|
|
int drm_legacy_switchctx(struct drm_device *dev, void *data,
|
||
|
|
struct drm_file *file_priv)
|
||
|
|
{
|
||
|
|
struct drm_ctx *ctx = data;
|
||
|
|
|
||
|
|
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
|
||
|
|
!drm_core_check_feature(dev, DRIVER_LEGACY))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
DRM_DEBUG("%d\n", ctx->handle);
|
||
|
|
return drm_context_switch(dev, dev->last_context, ctx->handle);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* New context.
|
||
|
|
*
|
||
|
|
* \param inode device inode.
|
||
|
|
* \param file_priv DRM file private.
|
||
|
|
* \param cmd command.
|
||
|
|
* \param arg user argument pointing to a drm_ctx structure.
|
||
|
|
* \return zero on success or a negative number on failure.
|
||
|
|
*
|
||
|
|
* Calls context_switch_complete().
|
||
|
|
*/
|
||
|
|
int drm_legacy_newctx(struct drm_device *dev, void *data,
|
||
|
|
struct drm_file *file_priv)
|
||
|
|
{
|
||
|
|
struct drm_ctx *ctx = data;
|
||
|
|
|
||
|
|
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
|
||
|
|
!drm_core_check_feature(dev, DRIVER_LEGACY))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
DRM_DEBUG("%d\n", ctx->handle);
|
||
|
|
drm_context_switch_complete(dev, file_priv, ctx->handle);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Remove context.
|
||
|
|
*
|
||
|
|
* \param inode device inode.
|
||
|
|
* \param file_priv DRM file private.
|
||
|
|
* \param cmd command.
|
||
|
|
* \param arg user argument pointing to a drm_ctx structure.
|
||
|
|
* \return zero on success or a negative number on failure.
|
||
|
|
*
|
||
|
|
* If not the special kernel context, calls ctxbitmap_free() to free the specified context.
|
||
|
|
*/
|
||
|
|
int drm_legacy_rmctx(struct drm_device *dev, void *data,
|
||
|
|
struct drm_file *file_priv)
|
||
|
|
{
|
||
|
|
struct drm_ctx *ctx = data;
|
||
|
|
|
||
|
|
if (!drm_core_check_feature(dev, DRIVER_KMS_LEGACY_CONTEXT) &&
|
||
|
|
!drm_core_check_feature(dev, DRIVER_LEGACY))
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
DRM_DEBUG("%d\n", ctx->handle);
|
||
|
|
if (ctx->handle != DRM_KERNEL_CONTEXT) {
|
||
|
|
if (dev->driver->context_dtor)
|
||
|
|
dev->driver->context_dtor(dev, ctx->handle);
|
||
|
|
drm_legacy_ctxbitmap_free(dev, ctx->handle);
|
||
|
|
}
|
||
|
|
|
||
|
|
mutex_lock(&dev->ctxlist_mutex);
|
||
|
|
if (!list_empty(&dev->ctxlist)) {
|
||
|
|
struct drm_ctx_list *pos, *n;
|
||
|
|
|
||
|
|
list_for_each_entry_safe(pos, n, &dev->ctxlist, head) {
|
||
|
|
if (pos->handle == ctx->handle) {
|
||
|
|
list_del(&pos->head);
|
||
|
|
kfree(pos);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
mutex_unlock(&dev->ctxlist_mutex);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*@}*/
|