lib: Provide an accelerated routine for readback from WC

Reading from WC is awfully slow as each access is uncached and so
performed synchronously, stalling for the memory load. x86 did introduce
some new instructions in SSE 4.1 to provide a small internal buffer to
accelerate reading back a cacheline at a time from uncached memory, for
this purpose.

v2: Don't be lazy and handle misalignment.
v3: Switch out of sse41 before emitting the generic memcpy routine
v4: Replace opencoded memcpy_from_wc
v5: Always flush the internal buffer before use (Eric)
v6: Assume bulk moves, so check for dst alignment.
v7: Use _mm_fence for _buitlin_ia32_mfence for consistency, remove
superfluous defines (Ville)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Eric Anholt <eric@anholt.net>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

1 files changed, 2 insertions, 61 deletions

diff --git a/tests/gem_fence_thrash.c b/tests/gem_fence_thrash.c
index c8ff961d..2d7fb2ff 100644
--- a/tests/gem_fence_thrash.c
+++ b/tests/gem_fence_thrash.c
@@ -107,75 +107,16 @@ bo_copy (void *_arg)
 	return NULL;
 }
 
-#if defined(__x86_64__) && !defined(__clang__)
-
-#pragma GCC push_options
-#pragma GCC target("sse4.1")
-
-#include <smmintrin.h>
-
-#define MOVNT 512
-
-__attribute__((noinline))
-static void copy_wc_page(void *dst, void *src)
-{
-	if (igt_x86_features() & SSE4_1) {
-		__m128i *S = (__m128i *)src;
-		__m128i *D = (__m128i *)dst;
-
-		for (int i = 0; i < PAGE_SIZE/CACHELINE; i++) {
-			__m128i tmp[4];
-
-			tmp[0] = _mm_stream_load_si128(S++);
-			tmp[1] = _mm_stream_load_si128(S++);
-			tmp[2] = _mm_stream_load_si128(S++);
-			tmp[3] = _mm_stream_load_si128(S++);
-
-			_mm_store_si128(D++, tmp[0]);
-			_mm_store_si128(D++, tmp[1]);
-			_mm_store_si128(D++, tmp[2]);
-			_mm_store_si128(D++, tmp[3]);
-		}
-	} else
-		memcpy(dst, src, PAGE_SIZE);
-}
-
-static void copy_wc_cacheline(void *dst, void *src)
-{
-	if (igt_x86_features() & SSE4_1) {
-		__m128i *S = (__m128i *)src;
-		__m128i *D = (__m128i *)dst;
-		__m128i tmp[4];
-
-		tmp[0] = _mm_stream_load_si128(S++);
-		tmp[1] = _mm_stream_load_si128(S++);
-		tmp[2] = _mm_stream_load_si128(S++);
-		tmp[3] = _mm_stream_load_si128(S++);
-
-		_mm_store_si128(D++, tmp[0]);
-		_mm_store_si128(D++, tmp[1]);
-		_mm_store_si128(D++, tmp[2]);
-		_mm_store_si128(D++, tmp[3]);
-	} else
-		memcpy(dst, src, CACHELINE);
-}
-
-#pragma GCC pop_options
-
-#else
-
 static void copy_wc_page(void *dst, const void *src)
 {
-	memcpy(dst, src, PAGE_SIZE);
+	igt_memcpy_from_wc(dst, src, PAGE_SIZE);
 }
 
 static void copy_wc_cacheline(void *dst, const void *src)
 {
-	memcpy(dst, src, CACHELINE);
+	igt_memcpy_from_wc(dst, src, CACHELINE);
 }
 
-#endif
-
 static void
 _bo_write_verify(struct test *t)
 {