drivers/gpu/drm/amd/amdgpu/amdgpu_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 "amdgpu.h"
  29 #include "amdgpu_display.h"
  30 #include <drm/amdgpu_drm.h>
  31 #include <linux/dma-buf.h>
  32
  33 static const struct dma_buf_ops amdgpu_dmabuf_ops;
  34
  35 struct sg_table *amdgpu_gem_prime_get_sg_table(struct drm_gem_object *obj)
  36 {
  37         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  38         int npages = bo->tbo.num_pages;
  39
  40         return drm_prime_pages_to_sg(bo->tbo.ttm->pages, npages);
  41 }
  42
  43 void *amdgpu_gem_prime_vmap(struct drm_gem_object *obj)
  44 {
  45         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  46         int ret;
  47
  48         ret = ttm_bo_kmap(&bo->tbo, 0, bo->tbo.num_pages,
  49                           &bo->dma_buf_vmap);
  50         if (ret)
  51                 return ERR_PTR(ret);
  52
  53         return bo->dma_buf_vmap.virtual;
  54 }
  55
  56 void amdgpu_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
  57 {
  58         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  59
  60         ttm_bo_kunmap(&bo->dma_buf_vmap);
  61 }
  62
  63 int amdgpu_gem_prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
  64 {
  65         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
  66         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
  67         unsigned asize = amdgpu_bo_size(bo);
  68         int ret;
  69
  70         if (!vma->vm_file)
  71                 return -ENODEV;
  72
  73         if (adev == NULL)
  74                 return -ENODEV;
  75
  76         /* Check for valid size. */
  77         if (asize < vma->vm_end - vma->vm_start)
  78                 return -EINVAL;
  79
  80         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
  81             (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
  82                 return -EPERM;
  83         }
  84         vma->vm_pgoff += amdgpu_bo_mmap_offset(bo) >> PAGE_SHIFT;
  85
  86         /* prime mmap does not need to check access, so allow here */
  87         ret = drm_vma_node_allow(&obj->vma_node, vma->vm_file->private_data);
  88         if (ret)
  89                 return ret;
  90
  91         ret = ttm_bo_mmap(vma->vm_file, vma, &adev->mman.bdev);
  92         drm_vma_node_revoke(&obj->vma_node, vma->vm_file->private_data);
  93
  94         return ret;
  95 }
  96
  97 struct drm_gem_object *
  98 amdgpu_gem_prime_import_sg_table(struct drm_device *dev,
  99                                  struct dma_buf_attachment *attach,
 100                                  struct sg_table *sg)
 101 {
 102         struct reservation_object *resv = attach->dmabuf->resv;
 103         struct amdgpu_device *adev = dev->dev_private;
 104         struct amdgpu_bo *bo;
 105         int ret;
 106
 107         ww_mutex_lock(&resv->lock, NULL);
 108         ret = amdgpu_bo_create(adev, attach->dmabuf->size, PAGE_SIZE,
 109                                AMDGPU_GEM_DOMAIN_CPU, 0, ttm_bo_type_sg,
 110                                resv, &bo);
 111         if (ret)
 112                 goto error;
 113
 114         bo->tbo.sg = sg;
 115         bo->tbo.ttm->sg = sg;
 116         bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
 117         bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
 118         if (attach->dmabuf->ops != &amdgpu_dmabuf_ops)
 119                 bo->prime_shared_count = 1;
 120
 121         ww_mutex_unlock(&resv->lock);
 122         return &bo->gem_base;
 123
 124 error:
 125         ww_mutex_unlock(&resv->lock);
 126         return ERR_PTR(ret);
 127 }
 128
 129 static int amdgpu_gem_map_attach(struct dma_buf *dma_buf,
 130                                  struct device *target_dev,
 131                                  struct dma_buf_attachment *attach)
 132 {
 133         struct drm_gem_object *obj = dma_buf->priv;
 134         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 135         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 136         long r;
 137
 138         r = drm_gem_map_attach(dma_buf, target_dev, attach);
 139         if (r)
 140                 return r;
 141
 142         r = amdgpu_bo_reserve(bo, false);
 143         if (unlikely(r != 0))
 144                 goto error_detach;
 145
 146
 147         if (attach->dev->driver != adev->dev->driver) {
 148                 /*
 149                  * Wait for all shared fences to complete before we switch to future
 150                  * use of exclusive fence on this prime shared bo.
 151                  */
 152                 r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
 153                                                         true, false,
 154                                                         MAX_SCHEDULE_TIMEOUT);
 155                 if (unlikely(r < 0)) {
 156                         DRM_DEBUG_PRIME("Fence wait failed: %li\n", r);
 157                         goto error_unreserve;
 158                 }
 159         }
 160
 161         /* pin buffer into GTT */
 162         r = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT, NULL);
 163         if (r)
 164                 goto error_unreserve;
 165
 166         if (attach->dev->driver != adev->dev->driver)
 167                 bo->prime_shared_count++;
 168
 169 error_unreserve:
 170         amdgpu_bo_unreserve(bo);
 171
 172 error_detach:
 173         if (r)
 174                 drm_gem_map_detach(dma_buf, attach);
 175         return r;
 176 }
 177
 178 static void amdgpu_gem_map_detach(struct dma_buf *dma_buf,
 179                                   struct dma_buf_attachment *attach)
 180 {
 181         struct drm_gem_object *obj = dma_buf->priv;
 182         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 183         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 184         int ret = 0;
 185
 186         ret = amdgpu_bo_reserve(bo, true);
 187         if (unlikely(ret != 0))
 188                 goto error;
 189
 190         amdgpu_bo_unpin(bo);
 191         if (attach->dev->driver != adev->dev->driver && bo->prime_shared_count)
 192                 bo->prime_shared_count--;
 193         amdgpu_bo_unreserve(bo);
 194
 195 error:
 196         drm_gem_map_detach(dma_buf, attach);
 197 }
 198
 199 struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj)
 200 {
 201         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 202
 203         return bo->tbo.resv;
 204 }
 205
 206 static int amdgpu_gem_begin_cpu_access(struct dma_buf *dma_buf,
 207                                        enum dma_data_direction direction)
 208 {
 209         struct amdgpu_bo *bo = gem_to_amdgpu_bo(dma_buf->priv);
 210         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 211         struct ttm_operation_ctx ctx = { true, false };
 212         u32 domain = amdgpu_display_framebuffer_domains(adev);
 213         int ret;
 214         bool reads = (direction == DMA_BIDIRECTIONAL ||
 215                       direction == DMA_FROM_DEVICE);
 216
 217         if (!reads || !(domain & AMDGPU_GEM_DOMAIN_GTT))
 218                 return 0;
 219
 220         /* move to gtt */
 221         ret = amdgpu_bo_reserve(bo, false);
 222         if (unlikely(ret != 0))
 223                 return ret;
 224
 225         if (!bo->pin_count && (bo->allowed_domains & AMDGPU_GEM_DOMAIN_GTT)) {
 226                 amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
 227                 ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 228         }
 229
 230         amdgpu_bo_unreserve(bo);
 231         return ret;
 232 }
 233
 234 static const struct dma_buf_ops amdgpu_dmabuf_ops = {
 235         .attach = amdgpu_gem_map_attach,
 236         .detach = amdgpu_gem_map_detach,
 237         .map_dma_buf = drm_gem_map_dma_buf,
 238         .unmap_dma_buf = drm_gem_unmap_dma_buf,
 239         .release = drm_gem_dmabuf_release,
 240         .begin_cpu_access = amdgpu_gem_begin_cpu_access,
 241         .map = drm_gem_dmabuf_kmap,
 242         .map_atomic = drm_gem_dmabuf_kmap_atomic,
 243         .unmap = drm_gem_dmabuf_kunmap,
 244         .unmap_atomic = drm_gem_dmabuf_kunmap_atomic,
 245         .mmap = drm_gem_dmabuf_mmap,
 246         .vmap = drm_gem_dmabuf_vmap,
 247         .vunmap = drm_gem_dmabuf_vunmap,
 248 };
 249
 250 struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
 251                                         struct drm_gem_object *gobj,
 252                                         int flags)
 253 {
 254         struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
 255         struct dma_buf *buf;
 256
 257         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
 258             bo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
 259                 return ERR_PTR(-EPERM);
 260
 261         buf = drm_gem_prime_export(dev, gobj, flags);
 262         if (!IS_ERR(buf)) {
 263                 buf->file->f_mapping = dev->anon_inode->i_mapping;
 264                 buf->ops = &amdgpu_dmabuf_ops;
 265         }
 266
 267         return buf;
 268 }
 269
 270 struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
 271                                             struct dma_buf *dma_buf)
 272 {
 273         struct drm_gem_object *obj;
 274
 275         if (dma_buf->ops == &amdgpu_dmabuf_ops) {
 276                 obj = dma_buf->priv;
 277                 if (obj->dev == dev) {
 278                         /*
 279                          * Importing dmabuf exported from out own gem increases
 280                          * refcount on gem itself instead of f_count of dmabuf.
 281                          */
 282                         drm_gem_object_get(obj);
 283                         return obj;
 284                 }
 285         }
 286
 287         return drm_gem_prime_import(dev, dma_buf);
 288 }