cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

radeon_prime.c (3185B)

      1/*
      2 * Copyright 2012 Advanced Micro Devices, Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * based on nouveau_prime.c
     23 *
     24 * Authors: Alex Deucher
     25 */
     26
     27#include <linux/dma-buf.h>
     28
     29#include <drm/drm_prime.h>
     30#include <drm/radeon_drm.h>
     31
     32#include "radeon.h"
     33#include "radeon_prime.h"
     34
     35struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
     36{
     37	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     38
     39	return drm_prime_pages_to_sg(obj->dev, bo->tbo.ttm->pages,
     40				     bo->tbo.ttm->num_pages);
     41}
     42
     43struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
     44							struct dma_buf_attachment *attach,
     45							struct sg_table *sg)
     46{
     47	struct dma_resv *resv = attach->dmabuf->resv;
     48	struct radeon_device *rdev = dev->dev_private;
     49	struct radeon_bo *bo;
     50	int ret;
     51
     52	dma_resv_lock(resv, NULL);
     53	ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
     54			       RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
     55	dma_resv_unlock(resv);
     56	if (ret)
     57		return ERR_PTR(ret);
     58
     59	bo->tbo.base.funcs = &radeon_gem_object_funcs;
     60
     61	mutex_lock(&rdev->gem.mutex);
     62	list_add_tail(&bo->list, &rdev->gem.objects);
     63	mutex_unlock(&rdev->gem.mutex);
     64
     65	bo->prime_shared_count = 1;
     66	return &bo->tbo.base;
     67}
     68
     69int radeon_gem_prime_pin(struct drm_gem_object *obj)
     70{
     71	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     72	int ret = 0;
     73
     74	ret = radeon_bo_reserve(bo, false);
     75	if (unlikely(ret != 0))
     76		return ret;
     77
     78	/* pin buffer into GTT */
     79	ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
     80	if (likely(ret == 0))
     81		bo->prime_shared_count++;
     82
     83	radeon_bo_unreserve(bo);
     84	return ret;
     85}
     86
     87void radeon_gem_prime_unpin(struct drm_gem_object *obj)
     88{
     89	struct radeon_bo *bo = gem_to_radeon_bo(obj);
     90	int ret = 0;
     91
     92	ret = radeon_bo_reserve(bo, false);
     93	if (unlikely(ret != 0))
     94		return;
     95
     96	radeon_bo_unpin(bo);
     97	if (bo->prime_shared_count)
     98		bo->prime_shared_count--;
     99	radeon_bo_unreserve(bo);
    100}
    101
    102
    103struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
    104					int flags)
    105{
    106	struct radeon_bo *bo = gem_to_radeon_bo(gobj);
    107	if (radeon_ttm_tt_has_userptr(bo->rdev, bo->tbo.ttm))
    108		return ERR_PTR(-EPERM);
    109	return drm_gem_prime_export(gobj, flags);
    110}