LXR linux/drivers/gpu/drm/radeon/radeon

   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
  34struct sg_table *radeon_gem_prime_get_sg_table(struct drm_gem_object *obj)
  35{
  36        struct radeon_bo *bo = gem_to_radeon_bo(obj);
  37        int npages = bo->tbo.num_pages;
  38
  39        return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
  40}
  41
  42void *radeon_gem_prime_vmap(struct drm_gem_object *obj)
  43{
  44        struct radeon_bo *bo = gem_to_radeon_bo(obj);
  45        int ret;
  46
  47        ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
  48                          &bo->dma_buf_vmap);
  49        if (ret)
  50                return ERR_PTR(ret);
  51
  52        return bo->dma_buf_vmap.virtual;
  53}
  54
  55void radeon_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  56{
  57        struct radeon_bo *bo = gem_to_radeon_bo(obj);
  58
  59        ttm_bo_kunmap(&bo->dma_buf_vmap);
  60}
  61
  62struct drm_gem_object *radeon_gem_prime_import_sg_table(struct drm_device *dev,
  63                                                        struct dma_buf_attachment *attach,
  64                                                        struct sg_table *sg)
  65{
  66        struct dma_resv *resv = attach->dmabuf->resv;
  67        struct radeon_device *rdev = dev->dev_private;
  68        struct radeon_bo *bo;
  69        int ret;
  70
  71        dma_resv_lock(resv, NULL);
  72        ret = radeon_bo_create(rdev, attach->dmabuf->size, PAGE_SIZE, false,
  73                               RADEON_GEM_DOMAIN_GTT, 0, sg, resv, &bo);
  74        dma_resv_unlock(resv);
  75        if (ret)
  76                return ERR_PTR(ret);
  77
  78        mutex_lock(&rdev->gem.mutex);
  79        list_add_tail(&bo->list, &rdev->gem.objects);
  80        mutex_unlock(&rdev->gem.mutex);
  81
  82        bo->prime_shared_count = 1;
  83        return &bo->tbo.base;
  84}
  85
  86int radeon_gem_prime_pin(struct drm_gem_object *obj)
  87{
  88        struct radeon_bo *bo = gem_to_radeon_bo(obj);
  89        int ret = 0;
  90
  91        ret = radeon_bo_reserve(bo, false);
  92        if (unlikely(ret != 0))
  93                return ret;
  94
  95        /* pin buffer into GTT */
  96        ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL);
  97        if (likely(ret == 0))
  98                bo->prime_shared_count++;
  99
 100        radeon_bo_unreserve(bo);
 101        return ret;
 102}
 103
 104void radeon_gem_prime_unpin(struct drm_gem_object *obj)
 105{
 106        struct radeon_bo *bo = gem_to_radeon_bo(obj);
 107        int ret = 0;
 108
 109        ret = radeon_bo_reserve(bo, false);
 110        if (unlikely(ret != 0))
 111                return;
 112
 113        radeon_bo_unpin(bo);
 114        if (bo->prime_shared_count)
 115                bo->prime_shared_count--;
 116        radeon_bo_unreserve(bo);
 117}
 118
 119
 120struct dma_buf *radeon_gem_prime_export(struct drm_gem_object *gobj,
 121                                        int flags)
 122{
 123        struct radeon_bo *bo = gem_to_radeon_bo(gobj);
 124        if (radeon_ttm_tt_has_userptr(bo->tbo.ttm))
 125                return ERR_PTR(-EPERM);
 126        return drm_gem_prime_export(gobj, flags);
 127}
 128