[RFC PATCH] drm/amdgpu: move ttm bo->offset to amdgpu_bo
Christian König
christian.koenig at amd.com
Tue Feb 11 12:17:27 UTC 2020
Am 11.02.20 um 13:06 schrieb Nirmoy:
> Hi Christian
>
> On 2/11/20 12:50 PM, Christian König wrote:
>> Am 11.02.20 um 12:17 schrieb Nirmoy Das:
>>> GPU address should belong to driver not in memory management.
>>> This patch moves ttm bo.offset and gpu_offset calculation to amdgpu
>>> driver.
>>
>> Actually for amdgpu we should be able to get completely rid of
>> bo->offset. All we need to do is to change amdgpu_bo_gpu_offset() and
>> do the correct offset calculation there.
>
> If I am not wrong with this patch amdgpu completly got rid of ttm's
> bo->offset and ttm_mem_type_manager->gpu_offset. Do you mean we don't
> even need amdgpu_bo->offset(added by this patch) as well ?
Yes exactly. IIRC we shouldn't have those many cases left using that and
we can just use a helper for those which calculated the offset from the
mem->start address.
Christian.
>
>
>
> Regards,
>
> Nirmoy
>
>>
>> Apart from that looks good to me.
>>
>> Regards,
>> Christian.
>>
>>>
>>> Signed-off-by: Nirmoy Das <nirmoy.das at amd.com>
>>> ---
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c | 4 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 22 ++++++++--
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 3 ++
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_test.c | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 40
>>> +++++++++----------
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h | 2 +-
>>> drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 8 ++--
>>> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 2 +-
>>> 12 files changed, 55 insertions(+), 38 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
>>> index 8609287620ea..613047ea9065 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
>>> @@ -263,7 +263,7 @@ int amdgpu_amdkfd_alloc_gtt_mem(struct kgd_dev
>>> *kgd, size_t size,
>>> goto allocate_mem_pin_bo_failed;
>>> }
>>> - r = amdgpu_ttm_alloc_gart(&bo->tbo);
>>> + r = amdgpu_ttm_alloc_gart(bo);
>>> if (r) {
>>> dev_err(adev->dev, "%p bind failed\n", bo);
>>> goto allocate_mem_kmap_bo_failed;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
>>> index d9b35df33806..f29986231b27 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_benchmark.c
>>> @@ -98,7 +98,7 @@ static void amdgpu_benchmark_move(struct
>>> amdgpu_device *adev, unsigned size,
>>> amdgpu_bo_unreserve(sobj);
>>> goto out_cleanup;
>>> }
>>> - r = amdgpu_ttm_alloc_gart(&sobj->tbo);
>>> + r = amdgpu_ttm_alloc_gart(sobj);
>>> amdgpu_bo_unreserve(sobj);
>>> if (r) {
>>> goto out_cleanup;
>>> @@ -117,7 +117,7 @@ static void amdgpu_benchmark_move(struct
>>> amdgpu_device *adev, unsigned size,
>>> amdgpu_bo_unreserve(sobj);
>>> goto out_cleanup;
>>> }
>>> - r = amdgpu_ttm_alloc_gart(&dobj->tbo);
>>> + r = amdgpu_ttm_alloc_gart(dobj);
>>> amdgpu_bo_unreserve(dobj);
>>> if (r) {
>>> goto out_cleanup;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>> index 80ba6dfc54e2..921719d92ab1 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
>>> @@ -642,7 +642,7 @@ static int amdgpu_cs_parser_bos(struct
>>> amdgpu_cs_parser *p,
>>> if (!r && p->uf_entry.tv.bo) {
>>> struct amdgpu_bo *uf = ttm_to_amdgpu_bo(p->uf_entry.tv.bo);
>>> - r = amdgpu_ttm_alloc_gart(&uf->tbo);
>>> + r = amdgpu_ttm_alloc_gart(uf);
>>> p->job->uf_addr += amdgpu_bo_gpu_offset(uf);
>>> }
>>> @@ -1676,5 +1676,5 @@ int amdgpu_cs_find_mapping(struct
>>> amdgpu_cs_parser *parser,
>>> return r;
>>> }
>>> - return amdgpu_ttm_alloc_gart(&(*bo)->tbo);
>>> + return amdgpu_ttm_alloc_gart(*bo);
>>> }
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
>>> index ca9056b0472a..3d0aa2b2926f 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
>>> @@ -199,7 +199,7 @@ int amdgpu_display_crtc_page_flip_target(struct
>>> drm_crtc *crtc,
>>> }
>>> }
>>> - r = amdgpu_ttm_alloc_gart(&new_abo->tbo);
>>> + r = amdgpu_ttm_alloc_gart(new_abo);
>>> if (unlikely(r != 0)) {
>>> DRM_ERROR("%p bind failed\n", new_abo);
>>> goto unpin;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
>>> index 143753d237e7..a02b1cbd006d 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fb.c
>>> @@ -174,7 +174,7 @@ static int amdgpufb_create_pinned_object(struct
>>> amdgpu_fbdev *rfbdev,
>>> goto out_unref;
>>> }
>>> - ret = amdgpu_ttm_alloc_gart(&abo->tbo);
>>> + ret = amdgpu_ttm_alloc_gart(abo);
>>> if (ret) {
>>> amdgpu_bo_unreserve(abo);
>>> dev_err(adev->dev, "%p bind failed\n", abo);
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> index 6f60a581e3ba..650758a5b3aa 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
>>> @@ -274,7 +274,7 @@ int amdgpu_bo_create_reserved(struct
>>> amdgpu_device *adev,
>>> goto error_unreserve;
>>> }
>>> - r = amdgpu_ttm_alloc_gart(&(*bo_ptr)->tbo);
>>> + r = amdgpu_ttm_alloc_gart(*bo_ptr);
>>> if (r) {
>>> dev_err(adev->dev, "%p bind failed\n", *bo_ptr);
>>> goto error_unpin;
>>> @@ -917,7 +917,7 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo
>>> *bo, u32 domain,
>>> bo->pin_count++;
>>> if (max_offset != 0) {
>>> - u64 domain_start = bo->tbo.bdev->man[mem_type].gpu_offset;
>>> + u64 domain_start = amdgpu_bo_gpu_start(adev, mem_type);
>>> WARN_ON_ONCE(max_offset <
>>> (amdgpu_bo_gpu_offset(bo) - domain_start));
>>> }
>>> @@ -1248,6 +1248,18 @@ int amdgpu_bo_get_metadata(struct amdgpu_bo
>>> *bo, void *buffer,
>>> return 0;
>>> }
>>> +uint64_t amdgpu_bo_gpu_start(struct amdgpu_device *adev, uint32_t
>>> type)
>>> +{
>>> + switch(type) {
>>> + case TTM_PL_TT:
>>> + return adev->gmc.gart_start;
>>> + case TTM_PL_VRAM:
>>> + return adev->gmc.vram_start;
>>> + }
>>> +
>>> + return 0;
>>> +}
>>> +
>>> /**
>>> * amdgpu_bo_move_notify - notification about a memory move
>>> * @bo: pointer to a buffer object
>>> @@ -1278,6 +1290,10 @@ void amdgpu_bo_move_notify(struct
>>> ttm_buffer_object *bo,
>>> if (evict)
>>> atomic64_inc(&adev->num_evictions);
>>> + if (new_mem)
>>> + abo->offset = (new_mem->start << PAGE_SHIFT) +
>>> + amdgpu_bo_gpu_start(amdgpu_ttm_adev(bo->bdev), new_mem->mem_type);
>>> +
>>> /* update statistics */
>>> if (!new_mem)
>>> return;
>>> @@ -1467,7 +1483,7 @@ u64 amdgpu_bo_gpu_offset(struct amdgpu_bo *bo)
>>> WARN_ON_ONCE(bo->tbo.mem.mem_type == TTM_PL_VRAM &&
>>> !(bo->flags & AMDGPU_GEM_CREATE_VRAM_CONTIGUOUS));
>>> - return amdgpu_gmc_sign_extend(bo->tbo.offset);
>>> + return amdgpu_gmc_sign_extend(bo->offset);
>>> }
>>> /**
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> index 96d805889e8d..c7e1028fd31f 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
>>> @@ -94,6 +94,8 @@ struct amdgpu_bo {
>>> unsigned prime_shared_count;
>>> /* per VM structure for page tables and with virtual addresses */
>>> struct amdgpu_vm_bo_base *vm_bo;
>>> + /* GPU address space is independent of CPU word size */
>>> + uint64_t offset;
>>> /* Constant after initialization */
>>> struct amdgpu_bo *parent;
>>> struct amdgpu_bo *shadow;
>>> @@ -294,6 +296,7 @@ int amdgpu_bo_restore_shadow(struct amdgpu_bo
>>> *shadow,
>>> uint32_t amdgpu_bo_get_preferred_pin_domain(struct amdgpu_device
>>> *adev,
>>> uint32_t domain);
>>> +uint64_t amdgpu_bo_gpu_start(struct amdgpu_device *adev, uint32_t
>>> type);
>>> /*
>>> * sub allocation
>>> */
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
>>> index 476f1f89aaad..dfab64bbb5fa 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_test.c
>>> @@ -103,7 +103,7 @@ static void amdgpu_do_test_moves(struct
>>> amdgpu_device *adev)
>>> DRM_ERROR("Failed to pin GTT object %d\n", i);
>>> goto out_lclean_unres;
>>> }
>>> - r = amdgpu_ttm_alloc_gart(>t_obj[i]->tbo);
>>> + r = amdgpu_ttm_alloc_gart(gtt_obj[i]);
>>> if (r) {
>>> DRM_ERROR("%p bind failed\n", gtt_obj[i]);
>>> goto out_lclean_unpin;
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> index 2c1d1eb1a7e1..15d9e8f807b9 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
>>> @@ -103,7 +103,6 @@ static int amdgpu_init_mem_type(struct
>>> ttm_bo_device *bdev, uint32_t type,
>>> case TTM_PL_TT:
>>> /* GTT memory */
>>> man->func = &amdgpu_gtt_mgr_func;
>>> - man->gpu_offset = adev->gmc.gart_start;
>>> man->available_caching = TTM_PL_MASK_CACHING;
>>> man->default_caching = TTM_PL_FLAG_CACHED;
>>> man->flags = TTM_MEMTYPE_FLAG_MAPPABLE |
>>> TTM_MEMTYPE_FLAG_CMA;
>>> @@ -111,7 +110,6 @@ static int amdgpu_init_mem_type(struct
>>> ttm_bo_device *bdev, uint32_t type,
>>> case TTM_PL_VRAM:
>>> /* "On-card" video ram */
>>> man->func = &amdgpu_vram_mgr_func;
>>> - man->gpu_offset = adev->gmc.vram_start;
>>> man->flags = TTM_MEMTYPE_FLAG_FIXED |
>>> TTM_MEMTYPE_FLAG_MAPPABLE;
>>> man->available_caching = TTM_PL_FLAG_UNCACHED |
>>> TTM_PL_FLAG_WC;
>>> @@ -122,7 +120,6 @@ static int amdgpu_init_mem_type(struct
>>> ttm_bo_device *bdev, uint32_t type,
>>> case AMDGPU_PL_OA:
>>> /* On-chip GDS memory*/
>>> man->func = &ttm_bo_manager_func;
>>> - man->gpu_offset = 0;
>>> man->flags = TTM_MEMTYPE_FLAG_FIXED | TTM_MEMTYPE_FLAG_CMA;
>>> man->available_caching = TTM_PL_FLAG_UNCACHED;
>>> man->default_caching = TTM_PL_FLAG_UNCACHED;
>>> @@ -270,7 +267,7 @@ static uint64_t amdgpu_mm_node_addr(struct
>>> ttm_buffer_object *bo,
>>> if (mm_node->start != AMDGPU_BO_INVALID_OFFSET) {
>>> addr = mm_node->start << PAGE_SHIFT;
>>> - addr += bo->bdev->man[mem->mem_type].gpu_offset;
>>> + addr += amdgpu_bo_gpu_start(amdgpu_ttm_adev(bo->bdev),
>>> mem->mem_type);
>>> }
>>> return addr;
>>> }
>>> @@ -1086,27 +1083,28 @@ static int amdgpu_ttm_backend_bind(struct
>>> ttm_tt *ttm,
>>> /**
>>> * amdgpu_ttm_alloc_gart - Allocate GART memory for buffer object
>>> */
>>> -int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo)
>>> +int amdgpu_ttm_alloc_gart(struct amdgpu_bo *bo)
>>> {
>>> - struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
>>> + struct ttm_buffer_object *tbo = &bo->tbo;
>>> + struct amdgpu_device *adev = amdgpu_ttm_adev(tbo->bdev);
>>> struct ttm_operation_ctx ctx = { false, false };
>>> - struct amdgpu_ttm_tt *gtt = (void*)bo->ttm;
>>> + struct amdgpu_ttm_tt *gtt = (void*)tbo->ttm;
>>> struct ttm_mem_reg tmp;
>>> struct ttm_placement placement;
>>> struct ttm_place placements;
>>> uint64_t addr, flags;
>>> int r;
>>> - if (bo->mem.start != AMDGPU_BO_INVALID_OFFSET)
>>> + if (tbo->mem.start != AMDGPU_BO_INVALID_OFFSET)
>>> return 0;
>>> - addr = amdgpu_gmc_agp_addr(bo);
>>> + addr = amdgpu_gmc_agp_addr(tbo);
>>> if (addr != AMDGPU_BO_INVALID_OFFSET) {
>>> - bo->mem.start = addr >> PAGE_SHIFT;
>>> + tbo->mem.start = addr >> PAGE_SHIFT;
>>> } else {
>>> /* allocate GART space */
>>> - tmp = bo->mem;
>>> + tmp = tbo->mem;
>>> tmp.mm_node = NULL;
>>> placement.num_placement = 1;
>>> placement.placement = &placements;
>>> @@ -1114,30 +1112,30 @@ int amdgpu_ttm_alloc_gart(struct
>>> ttm_buffer_object *bo)
>>> placement.busy_placement = &placements;
>>> placements.fpfn = 0;
>>> placements.lpfn = adev->gmc.gart_size >> PAGE_SHIFT;
>>> - placements.flags = (bo->mem.placement & ~TTM_PL_MASK_MEM) |
>>> + placements.flags = (tbo->mem.placement & ~TTM_PL_MASK_MEM) |
>>> TTM_PL_FLAG_TT;
>>> - r = ttm_bo_mem_space(bo, &placement, &tmp, &ctx);
>>> + r = ttm_bo_mem_space(tbo, &placement, &tmp, &ctx);
>>> if (unlikely(r))
>>> return r;
>>> /* compute PTE flags for this buffer object */
>>> - flags = amdgpu_ttm_tt_pte_flags(adev, bo->ttm, &tmp);
>>> + flags = amdgpu_ttm_tt_pte_flags(adev, tbo->ttm, &tmp);
>>> /* Bind pages */
>>> gtt->offset = (u64)tmp.start << PAGE_SHIFT;
>>> - r = amdgpu_ttm_gart_bind(adev, bo, flags);
>>> + r = amdgpu_ttm_gart_bind(adev, tbo, flags);
>>> if (unlikely(r)) {
>>> - ttm_bo_mem_put(bo, &tmp);
>>> + ttm_bo_mem_put(tbo, &tmp);
>>> return r;
>>> }
>>> - ttm_bo_mem_put(bo, &bo->mem);
>>> - bo->mem = tmp;
>>> + ttm_bo_mem_put(tbo, &tbo->mem);
>>> + tbo->mem = tmp;
>>> }
>>> - bo->offset = (bo->mem.start << PAGE_SHIFT) +
>>> - bo->bdev->man[bo->mem.mem_type].gpu_offset;
>>> + bo->offset = (tbo->mem.start << PAGE_SHIFT) +
>>> + amdgpu_bo_gpu_start(adev, tbo->mem.mem_type);
>>> return 0;
>>> }
>>> @@ -2149,7 +2147,7 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
>>> }
>>> if (bo->tbo.mem.mem_type == TTM_PL_TT) {
>>> - r = amdgpu_ttm_alloc_gart(&bo->tbo);
>>> + r = amdgpu_ttm_alloc_gart(bo);
>>> if (r)
>>> return r;
>>> }
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>> index f1ebd424510c..4f6e7ef2b004 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h
>>> @@ -100,7 +100,7 @@ int amdgpu_fill_buffer(struct amdgpu_bo *bo,
>>> struct dma_fence **fence);
>>> int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma);
>>> -int amdgpu_ttm_alloc_gart(struct ttm_buffer_object *bo);
>>> +int amdgpu_ttm_alloc_gart(struct amdgpu_bo *bo);
>>> int amdgpu_ttm_recover_gart(struct ttm_buffer_object *tbo);
>>> #if IS_ENABLED(CONFIG_DRM_AMDGPU_USERPTR)
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
>>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
>>> index 4cc7881f438c..c810cda7a06e 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
>>> @@ -37,12 +37,12 @@ static int amdgpu_vm_sdma_map_table(struct
>>> amdgpu_bo *table)
>>> {
>>> int r;
>>> - r = amdgpu_ttm_alloc_gart(&table->tbo);
>>> + r = amdgpu_ttm_alloc_gart(table);
>>> if (r)
>>> return r;
>>> if (table->shadow)
>>> - r = amdgpu_ttm_alloc_gart(&table->shadow->tbo);
>>> + r = amdgpu_ttm_alloc_gart(table->shadow);
>>> return r;
>>> }
>>> @@ -140,7 +140,7 @@ static void amdgpu_vm_sdma_copy_ptes(struct
>>> amdgpu_vm_update_params *p,
>>> src += p->num_dw_left * 4;
>>> - pe += amdgpu_gmc_sign_extend(bo->tbo.offset);
>>> + pe += amdgpu_gmc_sign_extend(bo->offset);
>>> trace_amdgpu_vm_copy_ptes(pe, src, count, p->direct);
>>> amdgpu_vm_copy_pte(p->adev, ib, pe, src, count);
>>> @@ -167,7 +167,7 @@ static void amdgpu_vm_sdma_set_ptes(struct
>>> amdgpu_vm_update_params *p,
>>> {
>>> struct amdgpu_ib *ib = p->job->ibs;
>>> - pe += amdgpu_gmc_sign_extend(bo->tbo.offset);
>>> + pe += amdgpu_gmc_sign_extend(bo->offset);
>>> trace_amdgpu_vm_set_ptes(pe, addr, count, incr, flags,
>>> p->direct);
>>> if (count < 3) {
>>> amdgpu_vm_write_pte(p->adev, ib, pe, addr | flags,
>>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> index 6786d34f7d04..277dbc6ba8ec 100644
>>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>>> @@ -5212,7 +5212,7 @@ static int dm_plane_helper_prepare_fb(struct
>>> drm_plane *plane,
>>> return r;
>>> }
>>> - r = amdgpu_ttm_alloc_gart(&rbo->tbo);
>>> + r = amdgpu_ttm_alloc_gart(rbo);
>>> if (unlikely(r != 0)) {
>>> amdgpu_bo_unpin(rbo);
>>> ttm_eu_backoff_reservation(&ticket, &list);
>>
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