Implement the fault handler ourself using the provided TTM functions.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 20 +++++------
drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 40 +++++++++++++++++++---
3 files changed, 46 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 63e9c5793c30..80bc7177cd45 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -1341,19 +1341,14 @@ void amdgpu_bo_release_notify(struct ttm_buffer_object *bo)
* Returns:
* 0 for success or a negative error code on failure.
*/
-int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
+vm_fault_t amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
{
struct amdgpu_device *adev = amdgpu_ttm_adev(bo->bdev);
struct ttm_operation_ctx ctx = { false, false };
- struct amdgpu_bo *abo;
+ struct amdgpu_bo *abo = ttm_to_amdgpu_bo(bo);
unsigned long offset, size;
int r;
- if (!amdgpu_bo_is_amdgpu_bo(bo))
- return 0;
-
- abo = ttm_to_amdgpu_bo(bo);
-
/* Remember that this BO was accessed by the CPU */
abo->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
@@ -1367,7 +1362,7 @@ int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
/* Can't move a pinned BO to visible VRAM */
if (abo->tbo.pin_count > 0)
- return -EINVAL;
+ return VM_FAULT_SIGBUS;
/* hurrah the memory is not visible ! */
atomic64_inc(&adev->num_vram_cpu_page_faults);
@@ -1379,15 +1374,18 @@ int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo)
abo->placement.busy_placement = &abo->placements[1];
r = ttm_bo_validate(bo, &abo->placement, &ctx);
- if (unlikely(r != 0))
- return r;
+ if (unlikely(r == -EBUSY || r == -ERESTARTSYS))
+ return VM_FAULT_NOPAGE;
+ else if (unlikely(r))
+ return VM_FAULT_SIGBUS;
offset = bo->mem.start << PAGE_SHIFT;
/* this should never happen */
if (bo->mem.mem_type == TTM_PL_VRAM &&
(offset + size) > adev->gmc.visible_vram_size)
- return -EINVAL;
+ return VM_FAULT_SIGBUS;
+ ttm_bo_move_to_lru_tail_unlocked(bo);
return 0;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index e91750e43448..132e5f955180 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -284,7 +284,7 @@ void amdgpu_bo_move_notify(struct ttm_buffer_object *bo,
bool evict,
struct ttm_resource *new_mem);
void amdgpu_bo_release_notify(struct ttm_buffer_object *bo);
-int amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo);
+vm_fault_t amdgpu_bo_fault_reserve_notify(struct ttm_buffer_object *bo);
void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
bool shared);
int amdgpu_bo_sync_wait_resv(struct amdgpu_device *adev, struct dma_resv *resv,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index d3bd2fd448be..399961035ae6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1708,7 +1708,6 @@ static struct ttm_bo_driver amdgpu_bo_driver = {
.verify_access = &amdgpu_verify_access,
.move_notify = &amdgpu_bo_move_notify,
.release_notify = &amdgpu_bo_release_notify,
- .fault_reserve_notify = &amdgpu_bo_fault_reserve_notify,
.io_mem_reserve = &amdgpu_ttm_io_mem_reserve,
.io_mem_pfn = amdgpu_ttm_io_mem_pfn,
.access_memory = &amdgpu_ttm_access_memory,
@@ -2088,15 +2087,48 @@ void amdgpu_ttm_set_buffer_funcs_status(struct amdgpu_device *adev, bool enable)
adev->mman.buffer_funcs_enabled = enable;
}
+static vm_fault_t amdgpu_ttm_fault(struct vm_fault *vmf)
+{
+ struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
+ vm_fault_t ret;
+
+ ret = ttm_bo_vm_reserve(bo, vmf);
+ if (ret)
+ return ret;
+
+ ret = amdgpu_bo_fault_reserve_notify(bo);
+ if (ret)
+ goto unlock;
+
+ ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
+ TTM_BO_VM_NUM_PREFAULT, 1);
+ if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
+ return ret;
+
+unlock:
+ dma_resv_unlock(bo->base.resv);
+ return ret;
+}
+
+static struct vm_operations_struct amdgpu_ttm_vm_ops = {
+ .fault = amdgpu_ttm_fault,
+ .open = ttm_bo_vm_open,
+ .close = ttm_bo_vm_close,
+ .access = ttm_bo_vm_access
+};
+
int amdgpu_mmap(struct file *filp, struct vm_area_struct *vma)
{
struct drm_file *file_priv = filp->private_data;
struct amdgpu_device *adev = drm_to_adev(file_priv->minor->dev);
+ int r;
- if (adev == NULL)
- return -EINVAL;
+ r = ttm_bo_mmap(filp, vma, &adev->mman.bdev);
+ if (unlikely(r != 0))
+ return r;
- return ttm_bo_mmap(filp, vma, &adev->mman.bdev);
+ vma->vm_ops = &amdgpu_ttm_vm_ops;
+ return 0;
}
int amdgpu_copy_buffer(struct amdgpu_ring *ring, uint64_t src_offset,
