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         struct amdgpu_bo_param bp;
 106         int ret;
 107
 108         memset(&bp, 0, sizeof(bp));
 109         bp.size = attach->dmabuf->size;
 110         bp.byte_align = PAGE_SIZE;
 111         bp.domain = AMDGPU_GEM_DOMAIN_CPU;
 112         bp.flags = 0;
 113         bp.type = ttm_bo_type_sg;
 114         bp.resv = resv;
 115         ww_mutex_lock(&resv->lock, NULL);
 116         ret = amdgpu_bo_create(adev, &bp, &bo);
 117         if (ret)
 118                 goto error;
 119
 120         bo->tbo.sg = sg;
 121         bo->tbo.ttm->sg = sg;
 122         bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
 123         bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
 124         if (attach->dmabuf->ops != &amdgpu_dmabuf_ops)
 125                 bo->prime_shared_count = 1;
 126
 127         ww_mutex_unlock(&resv->lock);
 128         return &bo->gem_base;
 129
 130 error:
 131         ww_mutex_unlock(&resv->lock);
 132         return ERR_PTR(ret);
 133 }
 134
 135 static int amdgpu_gem_map_attach(struct dma_buf *dma_buf,
 136                                  struct device *target_dev,
 137                                  struct dma_buf_attachment *attach)
 138 {
 139         struct drm_gem_object *obj = dma_buf->priv;
 140         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 141         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 142         long r;
 143
 144         r = drm_gem_map_attach(dma_buf, target_dev, attach);
 145         if (r)
 146                 return r;
 147
 148         r = amdgpu_bo_reserve(bo, false);
 149         if (unlikely(r != 0))
 150                 goto error_detach;
 151
 152
 153         if (attach->dev->driver != adev->dev->driver) {
 154                 /*
 155                  * Wait for all shared fences to complete before we switch to future
 156                  * use of exclusive fence on this prime shared bo.
 157                  */
 158                 r = reservation_object_wait_timeout_rcu(bo->tbo.resv,
 159                                                         true, false,
 160                                                         MAX_SCHEDULE_TIMEOUT);
 161                 if (unlikely(r < 0)) {
 162                         DRM_DEBUG_PRIME("Fence wait failed: %li\n", r);
 163                         goto error_unreserve;
 164                 }
 165         }
 166
 167         /* pin buffer into GTT */
 168         r = amdgpu_bo_pin(bo, AMDGPU_GEM_DOMAIN_GTT, NULL);
 169         if (r)
 170                 goto error_unreserve;
 171
 172         if (attach->dev->driver != adev->dev->driver)
 173                 bo->prime_shared_count++;
 174
 175 error_unreserve:
 176         amdgpu_bo_unreserve(bo);
 177
 178 error_detach:
 179         if (r)
 180                 drm_gem_map_detach(dma_buf, attach);
 181         return r;
 182 }
 183
 184 static void amdgpu_gem_map_detach(struct dma_buf *dma_buf,
 185                                   struct dma_buf_attachment *attach)
 186 {
 187         struct drm_gem_object *obj = dma_buf->priv;
 188         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 189         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 190         int ret = 0;
 191
 192         ret = amdgpu_bo_reserve(bo, true);
 193         if (unlikely(ret != 0))
 194                 goto error;
 195
 196         amdgpu_bo_unpin(bo);
 197         if (attach->dev->driver != adev->dev->driver && bo->prime_shared_count)
 198                 bo->prime_shared_count--;
 199         amdgpu_bo_unreserve(bo);
 200
 201 error:
 202         drm_gem_map_detach(dma_buf, attach);
 203 }
 204
 205 struct reservation_object *amdgpu_gem_prime_res_obj(struct drm_gem_object *obj)
 206 {
 207         struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
 208
 209         return bo->tbo.resv;
 210 }
 211
 212 static int amdgpu_gem_begin_cpu_access(struct dma_buf *dma_buf,
 213                                        enum dma_data_direction direction)
 214 {
 215         struct amdgpu_bo *bo = gem_to_amdgpu_bo(dma_buf->priv);
 216         struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
 217         struct ttm_operation_ctx ctx = { true, false };
 218         u32 domain = amdgpu_display_supported_domains(adev);
 219         int ret;
 220         bool reads = (direction == DMA_BIDIRECTIONAL ||
 221                       direction == DMA_FROM_DEVICE);
 222
 223         if (!reads || !(domain & AMDGPU_GEM_DOMAIN_GTT))
 224                 return 0;
 225
 226         /* move to gtt */
 227         ret = amdgpu_bo_reserve(bo, false);
 228         if (unlikely(ret != 0))
 229                 return ret;
 230
 231         if (!bo->pin_count && (bo->allowed_domains & AMDGPU_GEM_DOMAIN_GTT)) {
 232                 amdgpu_ttm_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
 233                 ret = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
 234         }
 235
 236         amdgpu_bo_unreserve(bo);
 237         return ret;
 238 }
 239
 240 static const struct dma_buf_ops amdgpu_dmabuf_ops = {
 241         .attach = amdgpu_gem_map_attach,
 242         .detach = amdgpu_gem_map_detach,
 243         .map_dma_buf = drm_gem_map_dma_buf,
 244         .unmap_dma_buf = drm_gem_unmap_dma_buf,
 245         .release = drm_gem_dmabuf_release,
 246         .begin_cpu_access = amdgpu_gem_begin_cpu_access,
 247         .map = drm_gem_dmabuf_kmap,
 248         .map_atomic = drm_gem_dmabuf_kmap_atomic,
 249         .unmap = drm_gem_dmabuf_kunmap,
 250         .unmap_atomic = drm_gem_dmabuf_kunmap_atomic,
 251         .mmap = drm_gem_dmabuf_mmap,
 252         .vmap = drm_gem_dmabuf_vmap,
 253         .vunmap = drm_gem_dmabuf_vunmap,
 254 };
 255
 256 struct dma_buf *amdgpu_gem_prime_export(struct drm_device *dev,
 257                                         struct drm_gem_object *gobj,
 258                                         int flags)
 259 {
 260         struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
 261         struct dma_buf *buf;
 262
 263         if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm) ||
 264             bo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
 265                 return ERR_PTR(-EPERM);
 266
 267         buf = drm_gem_prime_export(dev, gobj, flags);
 268         if (!IS_ERR(buf)) {
 269                 buf->file->f_mapping = dev->anon_inode->i_mapping;
 270                 buf->ops = &amdgpu_dmabuf_ops;
 271         }
 272
 273         return buf;
 274 }
 275
 276 struct drm_gem_object *amdgpu_gem_prime_import(struct drm_device *dev,
 277                                             struct dma_buf *dma_buf)
 278 {
 279         struct drm_gem_object *obj;
 280
 281         if (dma_buf->ops == &amdgpu_dmabuf_ops) {
 282                 obj = dma_buf->priv;
 283                 if (obj->dev == dev) {
 284                         /*
 285                          * Importing dmabuf exported from out own gem increases
 286                          * refcount on gem itself instead of f_count of dmabuf.
 287                          */
 288                         drm_gem_object_get(obj);
 289                         return obj;
 290                 }
 291         }
 292
 293         return drm_gem_prime_import(dev, dma_buf);
 294 }