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 "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 }