drm/radeon/kms: remove benchmarks shorter than one page

copy_blit operation works only on integral number of pages
so benchmarks shorter than one page size (4K) do not make sense

v2: use RADEON_GPU_PAGE_SIZE instead of "magic" 1024 number and
    sweep sizes between 1 * <page_size> to 16K * <page_size> doubling
    the size in each iteration; we get the same coverage, as
    in the original benchmark, but guarantee integer multiples
    of page size

v3: add whitespace between '*' operator per review received from
    zajec5@gmail.com

Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon_benchmark.c

@@ -208,22 +208,22 @@ void radeon_benchmark(struct radeon_device *rdev, int test_number)
 		break;
 	case 3:
 		/* GTT to VRAM, buffer size sweep, powers of 2 */
-		for (i = 1; i <= 65536; i <<= 1)
-			radeon_benchmark_move(rdev, i*1024,
+		for (i = 1; i <= 16384; i <<= 1)
+			radeon_benchmark_move(rdev, i * RADEON_GPU_PAGE_SIZE,
 					      RADEON_GEM_DOMAIN_GTT,
 					      RADEON_GEM_DOMAIN_VRAM);
 		break;
 	case 4:
 		/* VRAM to GTT, buffer size sweep, powers of 2 */
-		for (i = 1; i <= 65536; i <<= 1)
-			radeon_benchmark_move(rdev, i*1024,
+		for (i = 1; i <= 16384; i <<= 1)
+			radeon_benchmark_move(rdev, i * RADEON_GPU_PAGE_SIZE,
 					      RADEON_GEM_DOMAIN_VRAM,
 					      RADEON_GEM_DOMAIN_GTT);
 		break;
 	case 5:
 		/* VRAM to VRAM, buffer size sweep, powers of 2 */
-		for (i = 1; i <= 65536; i <<= 1)
-			radeon_benchmark_move(rdev, i*1024,
+		for (i = 1; i <= 16384; i <<= 1)
+			radeon_benchmark_move(rdev, i * RADEON_GPU_PAGE_SIZE,
 					      RADEON_GEM_DOMAIN_VRAM,
 					      RADEON_GEM_DOMAIN_VRAM);
 		break;