[PATCH 5/5] drm/radeon: clear the page directory using the DMA

[Christian König]

From: Christian K?nig <christian.koe...@amd.com>

Signed-off-by: Christian K?nig <christian.koenig at amd.com>
---
 drivers/gpu/drm/radeon/radeon_gart.c | 34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_gart.c 
b/drivers/gpu/drm/radeon/radeon_gart.c
index fd109d3..8a83b89 100644
--- a/drivers/gpu/drm/radeon/radeon_gart.c
+++ b/drivers/gpu/drm/radeon/radeon_gart.c
@@ -607,8 +607,8 @@ static int radeon_vm_evict(struct radeon_device *rdev, 
struct radeon_vm *vm)
  */
 int radeon_vm_alloc_pt(struct radeon_device *rdev, struct radeon_vm *vm)
 {
-       unsigned pd_size, pts_size;
-       u64 *pd_addr;
+       unsigned pd_size, pd_entries, pts_size;
+       struct radeon_ib ib;
        int r;

        if (vm == NULL) {
@@ -619,8 +619,10 @@ int radeon_vm_alloc_pt(struct radeon_device *rdev, struct 
radeon_vm *vm)
                return 0;
        }

-retry:
        pd_size = radeon_vm_directory_size(rdev);
+       pd_entries = radeon_vm_num_pdes(rdev);
+
+retry:
        r = radeon_sa_bo_new(rdev, &rdev->vm_manager.sa_manager,
                             &vm->page_directory, pd_size,
                             RADEON_VM_PTB_ALIGN_SIZE, false);
@@ -637,9 +639,31 @@ retry:
        vm->pd_gpu_addr = radeon_sa_bo_gpu_addr(vm->page_directory);

        /* Initially clear the page directory */
-       pd_addr = radeon_sa_bo_cpu_addr(vm->page_directory);
-       memset(pd_addr, 0, pd_size);
+       r = radeon_ib_get(rdev, R600_RING_TYPE_DMA_INDEX, &ib,
+                         NULL, pd_entries * 2 + 64);
+       if (r) {
+               radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
+               return r;
+       }
+
+       ib.length_dw = 0;
+
+       radeon_asic_vm_set_page(rdev, &ib, vm->pd_gpu_addr,
+                               0, pd_entries, 0, 0);
+
+       radeon_ib_sync_to(&ib, vm->fence);
+       r = radeon_ib_schedule(rdev, &ib, NULL);
+       if (r) {
+               radeon_ib_free(rdev, &ib);
+               radeon_sa_bo_free(rdev, &vm->page_directory, vm->fence);
+               return r;
+       }
+       radeon_fence_unref(&vm->fence);
+       vm->fence = radeon_fence_ref(ib.fence);
+       radeon_ib_free(rdev, &ib);
+       radeon_fence_unref(&vm->last_flush);

+       /* allocate page table array */
        pts_size = radeon_vm_num_pdes(rdev) * sizeof(struct radeon_sa_bo *);
        vm->page_tables = kzalloc(pts_size, GFP_KERNEL);

-- 
1.8.1.2