@@ -24,6 +24,7 @@
#include <linux/kernel.h>
#include <asm/fpu/api.h>
+#include <asm/simd.h>
#include "i915_memcpy.h"
@@ -38,6 +39,12 @@ static DEFINE_STATIC_KEY_FALSE(has_movntdqa);
#ifdef CONFIG_AS_MOVNTDQA
static void __memcpy_ntdqa(void *dst, const void *src, unsigned long len)
{
+ if (unlikely(!may_use_simd())) {
+ memcpy(dst, src, len);
+ return;
+ }
+
+
kernel_fpu_begin();
while (len >= 4) {
@@ -67,6 +74,11 @@ static void __memcpy_ntdqa(void *dst, const void *src, unsigned long len)
static void __memcpy_ntdqu(void *dst, const void *src, unsigned long len)
{
+ if (unlikely(!may_use_simd())) {
+ memcpy(dst, src, len);
+ return;
+ }
+
kernel_fpu_begin();
while (len >= 4) {
Sometimes it's not okay to use SIMD registers, the conditions for which have changed subtly from kernel release to kernel release. Usually the pattern is to check for may_use_simd() and then fallback to using something slower in the unlikely case SIMD registers aren't available. So, this patch fixes up i915's accelerated memcpy routines to fallback to boring memcpy if may_use_simd() is false. Cc: stable@vger.kernel.org Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> --- drivers/gpu/drm/i915/i915_memcpy.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)