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 * $FreeBSD: head/sys/dev/drm2/radeon/radeon_prime.c 254885 2013-08-25 19:37:15Z dumbbell $ 27 */ 28 29 #include <drm/drmP.h> 30 31 #include "radeon.h" 32 #include <drm/radeon_drm.h> 33 34 #include <linux/dma-buf.h> 35 36 static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment, 37 enum dma_data_direction dir) 38 { 39 struct radeon_bo *bo = attachment->dmabuf->priv; 40 struct drm_device *dev = bo->rdev->ddev; 41 int npages = bo->tbo.num_pages; 42 struct sg_table *sg; 43 int nents; 44 45 mutex_lock(&dev->struct_mutex); 46 sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages); 47 nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); 48 mutex_unlock(&dev->struct_mutex); 49 return sg; 50 } 51 52 static void radeon_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, 53 struct sg_table *sg, enum dma_data_direction dir) 54 { 55 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); 56 sg_free_table(sg); 57 kfree(sg); 58 } 59 60 static void radeon_gem_dmabuf_release(struct dma_buf *dma_buf) 61 { 62 struct radeon_bo *bo = dma_buf->priv; 63 64 if (bo->gem_base.export_dma_buf == dma_buf) { 65 DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base); 66 bo->gem_base.export_dma_buf = NULL; 67 drm_gem_object_unreference_unlocked(&bo->gem_base); 68 } 69 } 70 71 static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) 72 { 73 return NULL; 74 } 75 76 static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) 77 { 78 79 } 80 static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) 81 { 82 return NULL; 83 } 84 85 static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) 86 { 87 88 } 89 90 static int radeon_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) 91 { 92 return -EINVAL; 93 } 94 95 static void *radeon_gem_prime_vmap(struct dma_buf *dma_buf) 96 { 97 struct radeon_bo *bo = dma_buf->priv; 98 struct drm_device *dev = bo->rdev->ddev; 99 int ret; 100 101 mutex_lock(&dev->struct_mutex); 102 if (bo->vmapping_count) { 103 bo->vmapping_count++; 104 goto out_unlock; 105 } 106 107 ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, 108 &bo->dma_buf_vmap); 109 if (ret) { 110 mutex_unlock(&dev->struct_mutex); 111 return ERR_PTR(ret); 112 } 113 bo->vmapping_count = 1; 114 out_unlock: 115 mutex_unlock(&dev->struct_mutex); 116 return bo->dma_buf_vmap.virtual; 117 } 118 119 static void radeon_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr) 120 { 121 struct radeon_bo *bo = dma_buf->priv; 122 struct drm_device *dev = bo->rdev->ddev; 123 124 mutex_lock(&dev->struct_mutex); 125 bo->vmapping_count--; 126 if (bo->vmapping_count == 0) { 127 ttm_bo_kunmap(&bo->dma_buf_vmap); 128 } 129 mutex_unlock(&dev->struct_mutex); 130 } 131 const static struct dma_buf_ops radeon_dmabuf_ops = { 132 .map_dma_buf = radeon_gem_map_dma_buf, 133 .unmap_dma_buf = radeon_gem_unmap_dma_buf, 134 .release = radeon_gem_dmabuf_release, 135 .kmap = radeon_gem_kmap, 136 .kmap_atomic = radeon_gem_kmap_atomic, 137 .kunmap = radeon_gem_kunmap, 138 .kunmap_atomic = radeon_gem_kunmap_atomic, 139 .mmap = radeon_gem_prime_mmap, 140 .vmap = radeon_gem_prime_vmap, 141 .vunmap = radeon_gem_prime_vunmap, 142 }; 143 144 static int radeon_prime_create(struct drm_device *dev, 145 size_t size, 146 struct sg_table *sg, 147 struct radeon_bo **pbo) 148 { 149 struct radeon_device *rdev = dev->dev_private; 150 struct radeon_bo *bo; 151 int ret; 152 153 ret = radeon_bo_create(rdev, size, PAGE_SIZE, false, 154 RADEON_GEM_DOMAIN_GTT, sg, pbo); 155 if (ret) 156 return ret; 157 bo = *pbo; 158 bo->gem_base.driver_private = bo; 159 160 mutex_lock(&rdev->gem.mutex); 161 list_add_tail(&bo->list, &rdev->gem.objects); 162 mutex_unlock(&rdev->gem.mutex); 163 164 return 0; 165 } 166 167 struct dma_buf *radeon_gem_prime_export(struct drm_device *dev, 168 struct drm_gem_object *obj, 169 int flags) 170 { 171 struct radeon_bo *bo = gem_to_radeon_bo(obj); 172 int ret = 0; 173 174 ret = radeon_bo_reserve(bo, false); 175 if (unlikely(ret != 0)) 176 return ERR_PTR(ret); 177 178 /* pin buffer into GTT */ 179 ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL); 180 if (ret) { 181 radeon_bo_unreserve(bo); 182 return ERR_PTR(ret); 183 } 184 radeon_bo_unreserve(bo); 185 return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags); 186 } 187 188 struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, 189 struct dma_buf *dma_buf) 190 { 191 struct dma_buf_attachment *attach; 192 struct sg_table *sg; 193 struct radeon_bo *bo; 194 int ret; 195 196 if (dma_buf->ops == &radeon_dmabuf_ops) { 197 bo = dma_buf->priv; 198 if (bo->gem_base.dev == dev) { 199 drm_gem_object_reference(&bo->gem_base); 200 dma_buf_put(dma_buf); 201 return &bo->gem_base; 202 } 203 } 204 205 /* need to attach */ 206 attach = dma_buf_attach(dma_buf, dev->dev); 207 if (IS_ERR(attach)) 208 return ERR_CAST(attach); 209 210 sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); 211 if (IS_ERR(sg)) { 212 ret = PTR_ERR(sg); 213 goto fail_detach; 214 } 215 216 ret = radeon_prime_create(dev, dma_buf->size, sg, &bo); 217 if (ret) 218 goto fail_unmap; 219 220 bo->gem_base.import_attach = attach; 221 222 return &bo->gem_base; 223 224 fail_unmap: 225 dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); 226 fail_detach: 227 dma_buf_detach(dma_buf, attach); 228 return ERR_PTR(ret); 229 } 230