drm/amdgpu: use more than 64KB fragment size if possible

We align to 64KB, but when userspace aligns even more we can easily use more.
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c

@@ -818,13 +818,13 @@ static void amdgpu_vm_frag_ptes(struct amdgpu_pte_update_params	*params,
 	 * allocation size to the fragment size.
 	 */
 
-	/* 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;
+	const 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 || params->pages_addr || !(flags & AMDGPU_PTE_VALID) ||
 	    (frag_start >= frag_end)) {
@@ -833,6 +833,10 @@ 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,
@@ -842,7 +846,7 @@ 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 | frag_flags);
+			      flags | AMDGPU_PTE_FRAG(frag));
 
 	/* handle the 4K area at the end */
 	if (frag_end != end) {