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 <sys/cdefs.h> 28__FBSDID("$FreeBSD: releng/10.3/sys/dev/drm2/radeon/radeon_prime.c 254885 2013-08-25 19:37:15Z dumbbell $"); 29 30#include <drm/drmP.h> 31 32#include "radeon.h" 33#include <drm/radeon_drm.h> 34 35#include <linux/dma-buf.h> 36 37static struct sg_table *radeon_gem_map_dma_buf(struct dma_buf_attachment *attachment, 38 enum dma_data_direction dir) 39{ 40 struct radeon_bo *bo = attachment->dmabuf->priv; 41 struct drm_device *dev = bo->rdev->ddev; 42 int npages = bo->tbo.num_pages; 43 struct sg_table *sg; 44 int nents; 45 46 mutex_lock(&dev->struct_mutex); 47 sg = drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages); 48 nents = dma_map_sg(attachment->dev, sg->sgl, sg->nents, dir); 49 mutex_unlock(&dev->struct_mutex); 50 return sg; 51} 52 53static void radeon_gem_unmap_dma_buf(struct dma_buf_attachment *attachment, 54 struct sg_table *sg, enum dma_data_direction dir) 55{ 56 dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir); 57 sg_free_table(sg); 58 kfree(sg); 59} 60 61static void radeon_gem_dmabuf_release(struct dma_buf *dma_buf) 62{ 63 struct radeon_bo *bo = dma_buf->priv; 64 65 if (bo->gem_base.export_dma_buf == dma_buf) { 66 DRM_ERROR("unreference dmabuf %p\n", &bo->gem_base); 67 bo->gem_base.export_dma_buf = NULL; 68 drm_gem_object_unreference_unlocked(&bo->gem_base); 69 } 70} 71 72static void *radeon_gem_kmap_atomic(struct dma_buf *dma_buf, unsigned long page_num) 73{ 74 return NULL; 75} 76 77static void radeon_gem_kunmap_atomic(struct dma_buf *dma_buf, unsigned long page_num, void *addr) 78{ 79 80} 81static void *radeon_gem_kmap(struct dma_buf *dma_buf, unsigned long page_num) 82{ 83 return NULL; 84} 85 86static void radeon_gem_kunmap(struct dma_buf *dma_buf, unsigned long page_num, void *addr) 87{ 88 89} 90 91static int radeon_gem_prime_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma) 92{ 93 return -EINVAL; 94} 95 96static void *radeon_gem_prime_vmap(struct dma_buf *dma_buf) 97{ 98 struct radeon_bo *bo = dma_buf->priv; 99 struct drm_device *dev = bo->rdev->ddev; 100 int ret; 101 102 mutex_lock(&dev->struct_mutex); 103 if (bo->vmapping_count) { 104 bo->vmapping_count++; 105 goto out_unlock; 106 } 107 108 ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages, 109 &bo->dma_buf_vmap); 110 if (ret) { 111 mutex_unlock(&dev->struct_mutex); 112 return ERR_PTR(ret); 113 } 114 bo->vmapping_count = 1; 115out_unlock: 116 mutex_unlock(&dev->struct_mutex); 117 return bo->dma_buf_vmap.virtual; 118} 119 120static void radeon_gem_prime_vunmap(struct dma_buf *dma_buf, void *vaddr) 121{ 122 struct radeon_bo *bo = dma_buf->priv; 123 struct drm_device *dev = bo->rdev->ddev; 124 125 mutex_lock(&dev->struct_mutex); 126 bo->vmapping_count--; 127 if (bo->vmapping_count == 0) { 128 ttm_bo_kunmap(&bo->dma_buf_vmap); 129 } 130 mutex_unlock(&dev->struct_mutex); 131} 132const static struct dma_buf_ops radeon_dmabuf_ops = { 133 .map_dma_buf = radeon_gem_map_dma_buf, 134 .unmap_dma_buf = radeon_gem_unmap_dma_buf, 135 .release = radeon_gem_dmabuf_release, 136 .kmap = radeon_gem_kmap, 137 .kmap_atomic = radeon_gem_kmap_atomic, 138 .kunmap = radeon_gem_kunmap, 139 .kunmap_atomic = radeon_gem_kunmap_atomic, 140 .mmap = radeon_gem_prime_mmap, 141 .vmap = radeon_gem_prime_vmap, 142 .vunmap = radeon_gem_prime_vunmap, 143}; 144 145static int radeon_prime_create(struct drm_device *dev, 146 size_t size, 147 struct sg_table *sg, 148 struct radeon_bo **pbo) 149{ 150 struct radeon_device *rdev = dev->dev_private; 151 struct radeon_bo *bo; 152 int ret; 153 154 ret = radeon_bo_create(rdev, size, PAGE_SIZE, false, 155 RADEON_GEM_DOMAIN_GTT, sg, pbo); 156 if (ret) 157 return ret; 158 bo = *pbo; 159 bo->gem_base.driver_private = bo; 160 161 mutex_lock(&rdev->gem.mutex); 162 list_add_tail(&bo->list, &rdev->gem.objects); 163 mutex_unlock(&rdev->gem.mutex); 164 165 return 0; 166} 167 168struct dma_buf *radeon_gem_prime_export(struct drm_device *dev, 169 struct drm_gem_object *obj, 170 int flags) 171{ 172 struct radeon_bo *bo = gem_to_radeon_bo(obj); 173 int ret = 0; 174 175 ret = radeon_bo_reserve(bo, false); 176 if (unlikely(ret != 0)) 177 return ERR_PTR(ret); 178 179 /* pin buffer into GTT */ 180 ret = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_GTT, NULL); 181 if (ret) { 182 radeon_bo_unreserve(bo); 183 return ERR_PTR(ret); 184 } 185 radeon_bo_unreserve(bo); 186 return dma_buf_export(bo, &radeon_dmabuf_ops, obj->size, flags); 187} 188 189struct drm_gem_object *radeon_gem_prime_import(struct drm_device *dev, 190 struct dma_buf *dma_buf) 191{ 192 struct dma_buf_attachment *attach; 193 struct sg_table *sg; 194 struct radeon_bo *bo; 195 int ret; 196 197 if (dma_buf->ops == &radeon_dmabuf_ops) { 198 bo = dma_buf->priv; 199 if (bo->gem_base.dev == dev) { 200 drm_gem_object_reference(&bo->gem_base); 201 dma_buf_put(dma_buf); 202 return &bo->gem_base; 203 } 204 } 205 206 /* need to attach */ 207 attach = dma_buf_attach(dma_buf, dev->dev); 208 if (IS_ERR(attach)) 209 return ERR_CAST(attach); 210 211 sg = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL); 212 if (IS_ERR(sg)) { 213 ret = PTR_ERR(sg); 214 goto fail_detach; 215 } 216 217 ret = radeon_prime_create(dev, dma_buf->size, sg, &bo); 218 if (ret) 219 goto fail_unmap; 220 221 bo->gem_base.import_attach = attach; 222 223 return &bo->gem_base; 224 225fail_unmap: 226 dma_buf_unmap_attachment(attach, sg, DMA_BIDIRECTIONAL); 227fail_detach: 228 dma_buf_detach(dma_buf, attach); 229 return ERR_PTR(ret); 230} 231