Query whether or not we are in a legal context for using SIMD, before
using SSE4.2 registers.
Suggested-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_memcpy.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_memcpy.c b/drivers/gpu/drm/i915/i915_memcpy.c
index 7b3b83bd5ab8..fc18d6c28d5f 100644
--- a/drivers/gpu/drm/i915/i915_memcpy.c
+++ b/drivers/gpu/drm/i915/i915_memcpy.c
@@ -24,6 +24,7 @@
#include <linux/kernel.h>
#include <asm/fpu/api.h>
+#include <asm/simd.h>
#include "i915_memcpy.h"
@@ -115,6 +116,9 @@ bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len)
if (unlikely(((unsigned long)dst | (unsigned long)src | len) & 15))
return false;
+ if (unlikely(!may_use_simd()))
+ return false;
+
if (static_branch_likely(&has_movntdqa)) {
if (likely(len))
__memcpy_ntdqa(dst, src, len >> 4);
--
2.20.1
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