From: Christian König <christian.koe...@amd.com>
Write the PTEs at the end of the IB instead of directly into the SDMA commands.
This can save quite some CPU cycles building the entries.
Signed-off-by: Christian König <christian.koe...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 26 +++++++++++++++++++++-----
1 file changed, 21 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 2843132..7efcbe3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -910,15 +910,15 @@ static int amdgpu_vm_bo_update_mapping(struct
amdgpu_device *adev,
/* padding, etc. */
ndw = 64;
- if (params.src) {
+ if (src) {
/* only copy commands needed */
ndw += ncmds * 7;
- } else if (params.pages_addr) {
- /* header for write data commands */
- ndw += ncmds * 4;
+ } else if (pages_addr) {
+ /* copy commands needed */
+ ndw += ncmds * 7;
- /* body of write data command */
+ /* and also PTEs */
ndw += nptes * 2;
} else {
@@ -935,6 +935,22 @@ static int amdgpu_vm_bo_update_mapping(struct
amdgpu_device *adev,
params.ib = &job->ibs[0];
+ if (!src && pages_addr) {
+ uint64_t *pte;
+ unsigned i;
+
+ /* Put the PTEs at the end of the IB. */
+ i = ndw - nptes * 2;
+ pte= (uint64_t *)&(job->ibs->ptr[i]);
+ params.src = job->ibs->gpu_addr + i * 4;
+
+ for (i = 0; i < nptes; ++i) {
+ pte[i] = amdgpu_vm_map_gart(pages_addr, addr + i *
+ AMDGPU_GPU_PAGE_SIZE);
+ pte[i] |= flags;
+ }
+ }
+
r = amdgpu_sync_fence(adev, &job->sync, exclusive);
if (r)
goto error_free;
--
2.5.0
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