Alex Deucher | 40f5cf9 | 2012-05-10 18:33:13 -0400 | [diff] [blame^] | 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 | #include "drmP.h" |
| 27 | #include "drm.h" |
| 28 | |
| 29 | #include "radeon.h" |
| 30 | #include "radeon_drm.h" |
| 31 | |
| 32 | #include <linux/dma-buf.h> |
| 33 | |
| 34 | static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment, |
| 35 | enum dma_data_direction dir) |
| 36 | { |
| 37 | struct radeon_bo *bo = attachment->dmabuf->priv; |
| 38 | struct drm_device *dev = bo->rdev->ddev; |
| 39 | int npages = bo->tbo.num_pages; |
| 40 | struct sg_table *sg; |
| 41 | int nents; |
| 42 | |
| 43 | mutex_lock(&dev->struct_mutex); |
| 44 | sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages); |
| 45 | nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| 46 | mutex_unlock(&dev->struct_mutex); |
| 47 | return sg; |
| 48 | } |
| 49 | |
| 50 | static void radeon_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, |
| 51 | struct sg_table *sg, enum dma_data_direction dir) |
| 52 | { |
| 53 | dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); |
| 54 | sg_free_table(sg); |
| 55 | kfree(sg); |
| 56 | } |
| 57 | |
| 58 | static void radeon_gem_dmabuf_release(struct dma_buf *dma_buf) |
| 59 | { |
| 60 | struct radeon_bo *bo = dma_buf->priv; |
| 61 | |
| 62 | if (bo->gem_base.export_dma_buf == dma_buf) { |
| 63 | DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base); |
| 64 | bo->gem_base.export_dma_buf = NULL; |
| 65 | drm_gem_object_unreference_unlocked(&bo->gem_base); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) |
| 70 | { |
| 71 | return NULL; |
| 72 | } |
| 73 | |
| 74 | static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| 75 | { |
| 76 | |
| 77 | } |
| 78 | static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) |
| 79 | { |
| 80 | return NULL; |
| 81 | } |
| 82 | |
| 83 | static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) |
| 84 | { |
| 85 | |
| 86 | } |
| 87 | |
| 88 | struct dma_buf_ops radeon_dmabuf_ops = { |
| 89 | .map_dma_buf = radeon_gem_map_dma_buf, |
| 90 | .unmap_dma_buf = radeon_gem_unmap_dma_buf, |
| 91 | .release = radeon_gem_dmabuf_release, |
| 92 | .kmap = radeon_gem_kmap, |
| 93 | .kmap_atomic = radeon_gem_kmap_atomic, |
| 94 | .kunmap = radeon_gem_kunmap, |
| 95 | .kunmap_atomic = radeon_gem_kunmap_atomic, |
| 96 | }; |
| 97 | |
| 98 | static int radeon_prime_create(struct drm_device *dev, |
| 99 | size_t size, |
| 100 | struct sg_table *sg, |
| 101 | struct radeon_bo **pbo) |
| 102 | { |
| 103 | struct radeon_device *rdev = dev->dev_private; |
| 104 | struct radeon_bo *bo; |
| 105 | int ret; |
| 106 | |
| 107 | ret = radeon_bo_create(rdev, size, PAGE_SIZE, false, |
| 108 | RADEON_GEM_DOMAIN_GTT, sg, pbo); |
| 109 | if (ret) |
| 110 | return ret; |
| 111 | bo = *pbo; |
| 112 | bo->gem_base.driver_private = bo; |
| 113 | |
| 114 | mutex_lock(&rdev->gem.mutex); |
| 115 | list_add_tail(&bo->list, &rdev->gem.objects); |
| 116 | mutex_unlock(&rdev->gem.mutex); |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | struct dma_buf *radeon_gem_prime_export(struct drm_device *dev, |
| 122 | struct drm_gem_object *obj, |
| 123 | int flags) |
| 124 | { |
| 125 | struct radeon_bo *bo = gem_to_radeon_bo(obj); |
| 126 | int ret = 0; |
| 127 | |
| 128 | /* pin buffer into GTT */ |
| 129 | ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL); |
| 130 | if (ret) |
| 131 | return ERR_PTR(ret); |
| 132 | |
| 133 | return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags); |
| 134 | } |
| 135 | |
| 136 | struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, |
| 137 | struct dma_buf *dma_buf) |
| 138 | { |
| 139 | struct dma_buf_attachment *attach; |
| 140 | struct sg_table *sg; |
| 141 | struct radeon_bo *bo; |
| 142 | int ret; |
| 143 | |
| 144 | if (dma_buf->ops == &radeon_dmabuf_ops) { |
| 145 | bo = dma_buf->priv; |
| 146 | if (bo->gem_base.dev == dev) { |
| 147 | drm_gem_object_reference(&bo->gem_base); |
| 148 | return &bo->gem_base; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /* need to attach */ |
| 153 | attach = dma_buf_attach(dma_buf, dev->dev); |
| 154 | if (IS_ERR(attach)) |
| 155 | return ERR_CAST(attach); |
| 156 | |
| 157 | sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); |
| 158 | if (IS_ERR(sg)) { |
| 159 | ret = PTR_ERR(sg); |
| 160 | goto fail_detach; |
| 161 | } |
| 162 | |
| 163 | ret = radeon_prime_create(dev, dma_buf->size, sg, &bo); |
| 164 | if (ret) |
| 165 | goto fail_unmap; |
| 166 | |
| 167 | bo->gem_base.import_attach = attach; |
| 168 | |
| 169 | return &bo->gem_base; |
| 170 | |
| 171 | fail_unmap: |
| 172 | dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); |
| 173 | fail_detach: |
| 174 | dma_buf_detach(dma_buf, attach); |
| 175 | return ERR_PTR(ret); |
| 176 | } |