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 static int radeon_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) 89 { 90 return -EINVAL; 91 } 92 93 static void *radeon_gem_prime_vmap(struct dma_buf *dma_buf) 94 { 95 struct radeon_bo *bo = dma_buf->priv; 96 struct drm_device *dev = bo->rdev->ddev; 97 int ret; 98 99 mutex_lock(&dev->struct_mutex); 100 if (bo->vmapping_count) { 101 bo->vmapping_count++; 102 goto out_unlock; 103 } 104 105 ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, 106 &bo->dma_buf_vmap); 107 if (ret) { 108 mutex_unlock(&dev->struct_mutex); 109 return ERR_PTR(ret); 110 } 111 bo->vmapping_count = 1; 112 out_unlock: 113 mutex_unlock(&dev->struct_mutex); 114 return bo->dma_buf_vmap.virtual; 115 } 116 117 static void radeon_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr) 118 { 119 struct radeon_bo *bo = dma_buf->priv; 120 struct drm_device *dev = bo->rdev->ddev; 121 122 mutex_lock(&dev->struct_mutex); 123 bo->vmapping_count--; 124 if (bo->vmapping_count == 0) { 125 ttm_bo_kunmap(&bo->dma_buf_vmap); 126 } 127 mutex_unlock(&dev->struct_mutex); 128 } 129 const static struct dma_buf_ops radeon_dmabuf_ops = { 130 .map_dma_buf = radeon_gem_map_dma_buf, 131 .unmap_dma_buf = radeon_gem_unmap_dma_buf, 132 .release = radeon_gem_dmabuf_release, 133 .kmap = radeon_gem_kmap, 134 .kmap_atomic = radeon_gem_kmap_atomic, 135 .kunmap = radeon_gem_kunmap, 136 .kunmap_atomic = radeon_gem_kunmap_atomic, 137 .mmap = radeon_gem_prime_mmap, 138 .vmap = radeon_gem_prime_vmap, 139 .vunmap = radeon_gem_prime_vunmap, 140 }; 141 142 static int radeon_prime_create(struct drm_device *dev, 143 size_t size, 144 struct sg_table *sg, 145 struct radeon_bo **pbo) 146 { 147 struct radeon_device *rdev = dev->dev_private; 148 struct radeon_bo *bo; 149 int ret; 150 151 ret = radeon_bo_create(rdev, size, PAGE_SIZE, false, 152 RADEON_GEM_DOMAIN_GTT, sg, pbo); 153 if (ret) 154 return ret; 155 bo = *pbo; 156 bo->gem_base.driver_private = bo; 157 158 mutex_lock(&rdev->gem.mutex); 159 list_add_tail(&bo->list, &rdev->gem.objects); 160 mutex_unlock(&rdev->gem.mutex); 161 162 return 0; 163 } 164 165 struct dma_buf *radeon_gem_prime_export(struct drm_device *dev, 166 struct drm_gem_object *obj, 167 int flags) 168 { 169 struct radeon_bo *bo = gem_to_radeon_bo(obj); 170 int ret = 0; 171 172 ret = radeon_bo_reserve(bo, false); 173 if (unlikely(ret != 0)) 174 return ERR_PTR(ret); 175 176 /* pin buffer into GTT */ 177 ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL); 178 if (ret) { 179 radeon_bo_unreserve(bo); 180 return ERR_PTR(ret); 181 } 182 radeon_bo_unreserve(bo); 183 return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags); 184 } 185 186 struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, 187 struct dma_buf *dma_buf) 188 { 189 struct dma_buf_attachment *attach; 190 struct sg_table *sg; 191 struct radeon_bo *bo; 192 int ret; 193 194 if (dma_buf->ops == &radeon_dmabuf_ops) { 195 bo = dma_buf->priv; 196 if (bo->gem_base.dev == dev) { 197 drm_gem_object_reference(&bo->gem_base); 198 return &bo->gem_base; 199 } 200 } 201 202 /* need to attach */ 203 attach = dma_buf_attach(dma_buf, dev->dev); 204 if (IS_ERR(attach)) 205 return ERR_CAST(attach); 206 207 sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); 208 if (IS_ERR(sg)) { 209 ret = PTR_ERR(sg); 210 goto fail_detach; 211 } 212 213 ret = radeon_prime_create(dev, dma_buf->size, sg, &bo); 214 if (ret) 215 goto fail_unmap; 216 217 bo->gem_base.import_attach = attach; 218 219 return &bo->gem_base; 220 221 fail_unmap: 222 dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); 223 fail_detach: 224 dma_buf_detach(dma_buf, attach); 225 return ERR_PTR(ret); 226 } 227