drivers/gpu/drm/radeon/radeon_prime.c

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