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drm/amdgpu: Make pin_size values atomic 

Concurrent execution of the non-atomic arithmetic could result in
completely bogus values.

v2:
* Rebased on v2 of the previous patch

Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/106872
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Michel Dänzer 2018-07-11 12:00:40 +02:00 committed by Alex Deucher
parent ddc21af4d0
commit a5ccfe5c20
4 changed files with 23 additions and 21 deletions
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6
drivers/gpu/drm/amd/amdgpu/amdgpu.h
View File

@ -1589,9 +1589,9 @@ struct amdgpu_device {
DECLARE_HASHTABLE(mn_hash, 7);
/* tracking pinned memory */
u64 vram_pin_size;
u64 visible_pin_size;
u64 gart_pin_size;
atomic64_t vram_pin_size;
atomic64_t visible_pin_size;
atomic64_t gart_pin_size;
/* amdkfd interface */
struct kfd_dev *kfd;

2
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
View File

@ -262,7 +262,7 @@ static void amdgpu_cs_get_threshold_for_moves(struct amdgpu_device *adev,
return;
}
total_vram = adev->gmc.real_vram_size - adev->vram_pin_size;
total_vram = adev->gmc.real_vram_size - atomic64_read(&adev->vram_pin_size);
used_vram = amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
free_vram = used_vram >= total_vram ? 0 : total_vram - used_vram;

22
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
View File

@ -501,13 +501,13 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
case AMDGPU_INFO_VRAM_GTT: {
struct drm_amdgpu_info_vram_gtt vram_gtt;
vram_gtt.vram_size = adev->gmc.real_vram_size;
vram_gtt.vram_size -= adev->vram_pin_size;
vram_gtt.vram_cpu_accessible_size = adev->gmc.visible_vram_size;
vram_gtt.vram_cpu_accessible_size -= adev->visible_pin_size;
vram_gtt.vram_size = adev->gmc.real_vram_size -
atomic64_read(&adev->vram_pin_size);
vram_gtt.vram_cpu_accessible_size = adev->gmc.visible_vram_size -
atomic64_read(&adev->visible_pin_size);
vram_gtt.gtt_size = adev->mman.bdev.man[TTM_PL_TT].size;
vram_gtt.gtt_size *= PAGE_SIZE;
vram_gtt.gtt_size -= adev->gart_pin_size;
vram_gtt.gtt_size -= atomic64_read(&adev->gart_pin_size);
return copy_to_user(out, &vram_gtt,
min((size_t)size, sizeof(vram_gtt))) ? -EFAULT : 0;
}
@ -516,16 +516,16 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
memset(&mem, 0, sizeof(mem));
mem.vram.total_heap_size = adev->gmc.real_vram_size;
mem.vram.usable_heap_size =
adev->gmc.real_vram_size - adev->vram_pin_size;
mem.vram.usable_heap_size = adev->gmc.real_vram_size -
atomic64_read(&adev->vram_pin_size);
mem.vram.heap_usage =
amdgpu_vram_mgr_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
mem.vram.max_allocation = mem.vram.usable_heap_size * 3 / 4;
mem.cpu_accessible_vram.total_heap_size =
adev->gmc.visible_vram_size;
mem.cpu_accessible_vram.usable_heap_size =
adev->gmc.visible_vram_size - adev->visible_pin_size;
mem.cpu_accessible_vram.usable_heap_size = adev->gmc.visible_vram_size -
atomic64_read(&adev->visible_pin_size);
mem.cpu_accessible_vram.heap_usage =
amdgpu_vram_mgr_vis_usage(&adev->mman.bdev.man[TTM_PL_VRAM]);
mem.cpu_accessible_vram.max_allocation =
@ -533,8 +533,8 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
mem.gtt.total_heap_size = adev->mman.bdev.man[TTM_PL_TT].size;
mem.gtt.total_heap_size *= PAGE_SIZE;
mem.gtt.usable_heap_size = mem.gtt.total_heap_size
- adev->gart_pin_size;
mem.gtt.usable_heap_size = mem.gtt.total_heap_size -
atomic64_read(&adev->gart_pin_size);
mem.gtt.heap_usage =
amdgpu_gtt_mgr_usage(&adev->mman.bdev.man[TTM_PL_TT]);
mem.gtt.max_allocation = mem.gtt.usable_heap_size * 3 / 4;

14
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
View File

@ -916,10 +916,11 @@ int amdgpu_bo_pin_restricted(struct amdgpu_bo *bo, u32 domain,
domain = amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type);
if (domain == AMDGPU_GEM_DOMAIN_VRAM) {
adev->vram_pin_size += amdgpu_bo_size(bo);
adev->visible_pin_size += amdgpu_vram_mgr_bo_visible_size(bo);
atomic64_add(amdgpu_bo_size(bo), &adev->vram_pin_size);
atomic64_add(amdgpu_vram_mgr_bo_visible_size(bo),
&adev->visible_pin_size);
} else if (domain == AMDGPU_GEM_DOMAIN_GTT) {
adev->gart_pin_size += amdgpu_bo_size(bo);
atomic64_add(amdgpu_bo_size(bo), &adev->gart_pin_size);
}
error:
@ -968,10 +969,11 @@ int amdgpu_bo_unpin(struct amdgpu_bo *bo)
return 0;
if (bo->tbo.mem.mem_type == TTM_PL_VRAM) {
adev->vram_pin_size -= amdgpu_bo_size(bo);
adev->visible_pin_size -= amdgpu_vram_mgr_bo_visible_size(bo);
atomic64_sub(amdgpu_bo_size(bo), &adev->vram_pin_size);
atomic64_sub(amdgpu_vram_mgr_bo_visible_size(bo),
&adev->visible_pin_size);
} else if (bo->tbo.mem.mem_type == TTM_PL_TT) {
adev->gart_pin_size -= amdgpu_bo_size(bo);
atomic64_sub(amdgpu_bo_size(bo), &adev->gart_pin_size);
}
for (i = 0; i < bo->placement.num_placement; i++) {