There is no need for the destination address to be aligned to 16 byte boundary to be able to use the non-temporal instructions while copying. Non-temporal instructions are used only for loading from the source address which has alignment constraints. We only need to take care of using the right instructions, based on whether destination address is aligned or not, while storing the data to the destination address.
__memcpy_ntdqu is copied from i915/i915_memcpy.c
Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Cc: Maxime Ripard mripard@kernel.org Cc: Thomas Zimmermann tzimmermann@suse.de Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Cc: Chris Wilson chris.p.wilson@intel.com
Signed-off-by: Balasubramani Vivekanandan balasubramani.vivekanandan@intel.com Reviewed-by: Lucas De Marchi lucas.demarchi@intel.com Reviewed-by: Nirmoy Das nirmoy.das@intel.com --- drivers/gpu/drm/drm_cache.c | 44 ++++++++++++++++++++++++++++++++----- 1 file changed, 38 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/drm_cache.c b/drivers/gpu/drm/drm_cache.c index 7051c9c909c2..2e2545df3310 100644 --- a/drivers/gpu/drm/drm_cache.c +++ b/drivers/gpu/drm/drm_cache.c @@ -278,18 +278,50 @@ static void __memcpy_ntdqa(void *dst, const void *src, unsigned long len) kernel_fpu_end(); }
+static void __memcpy_ntdqu(void *dst, const void *src, unsigned long len) +{ + kernel_fpu_begin(); + + while (len >= 4) { + asm("movntdqa (%0), %%xmm0\n" + "movntdqa 16(%0), %%xmm1\n" + "movntdqa 32(%0), %%xmm2\n" + "movntdqa 48(%0), %%xmm3\n" + "movups %%xmm0, (%1)\n" + "movups %%xmm1, 16(%1)\n" + "movups %%xmm2, 32(%1)\n" + "movups %%xmm3, 48(%1)\n" + :: "r" (src), "r" (dst) : "memory"); + src += 64; + dst += 64; + len -= 4; + } + while (len--) { + asm("movntdqa (%0), %%xmm0\n" + "movups %%xmm0, (%1)\n" + :: "r" (src), "r" (dst) : "memory"); + src += 16; + dst += 16; + } + + kernel_fpu_end(); +} + /* * __drm_memcpy_from_wc copies @len bytes from @src to @dst using - * non-temporal instructions where available. Note that all arguments - * (@src, @dst) must be aligned to 16 bytes and @len must be a multiple - * of 16. + * non-temporal instructions where available. Note that @src must be aligned to + * 16 bytes and @len must be a multiple of 16. */ static void __drm_memcpy_from_wc(void *dst, const void *src, unsigned long len) { - if (unlikely(((unsigned long)dst | (unsigned long)src | len) & 15)) + if (unlikely(((unsigned long)src | len) & 15)) { memcpy(dst, src, len); - else if (likely(len)) - __memcpy_ntdqa(dst, src, len >> 4); + } else if (likely(len)) { + if (IS_ALIGNED((unsigned long)dst, 16)) + __memcpy_ntdqa(dst, src, len >> 4); + else + __memcpy_ntdqu(dst, src, len >> 4); + } }
/**