[PATCH] drm/amdgpu: revert "use more than 64KB fragment size if possible"

[Christian König]

From: Christian König <christian.koenig at amd.com>

This reverts commit 1dcd32fb9c54334ec948a0f18174a748d6b14364.

The block size is indeed an equal match, so this can cause performance regressions.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 5d9b108..f4b78b6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -882,13 +882,13 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params	*params,
 	 * allocation size to the fragment size.
 	 */
 
-	const uint64_t frag_align = 1 << AMDGPU_LOG2_PAGES_PER_FRAG;
+	/* SI and newer are optimized for 64KB */
+	uint64_t frag_flags = AMDGPU_PTE_FRAG(AMDGPU_LOG2_PAGES_PER_FRAG);
+	uint64_t frag_align = 1 << AMDGPU_LOG2_PAGES_PER_FRAG;
 
 	uint64_t frag_start = ALIGN(start, frag_align);
 	uint64_t frag_end = end & ~(frag_align - 1);
 
-	uint32_t frag;
-
 	/* system pages are non continuously */
 	if (params->src || !(flags & AMDGPU_PTE_VALID) ||
 	    (frag_start >= frag_end)) {
@@ -897,10 +897,6 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params	*params,
 		return;
 	}
 
-	/* use more than 64KB fragment size if possible */
-	frag = lower_32_bits(frag_start | frag_end);
-	frag = likely(frag) ? __ffs(frag) : 31;
-
 	/* handle the 4K area at the beginning */
 	if (start != frag_start) {
 		amdgpu_vm_update_ptes(params, vm, start, frag_start,
@@ -910,7 +906,7 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params	*params,
 
 	/* handle the area in the middle */
 	amdgpu_vm_update_ptes(params, vm, frag_start, frag_end, dst,
-			      flags | AMDGPU_PTE_FRAG(frag));
+			      flags | frag_flags);
 
 	/* handle the 4K area at the end */
 	if (frag_end != end) {
-- 
2.5.0