> -----Original Message-----
> From: Cheng, Michael <michael.cheng@xxxxxxxxx>
> Sent: Friday, January 28, 2022 2:10 PM
> To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: Cheng, Michael <michael.cheng@xxxxxxxxx>; Bowman, Casey G
> <casey.g.bowman@xxxxxxxxx>; De Marchi, Lucas
> <lucas.demarchi@xxxxxxxxx>; Boyer, Wayne <wayne.boyer@xxxxxxxxx>;
> ville.syrjala@xxxxxxxxxxxxxxx; Kuoppala, Mika <mika.kuoppala@xxxxxxxxx>;
> Auld, Matthew <matthew.auld@xxxxxxxxx>
> Subject: [PATCH v2 4/4] drm/i915/: Re-work clflush_write32
>
> Use drm_clflush_virt_range instead of clflushopt and remove the memory
> barrier, since drm_clflush_virt_range takes care of that.
>
> Signed-off-by: Michael Cheng <michael.cheng@xxxxxxxxx>
Reviewed-by: Casey Bowman <casey.g.bowman@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 8 +++-----
> 1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> index 498b458fd784..0854276ff7ba 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
> @@ -1332,10 +1332,8 @@ static void *reloc_vaddr(struct i915_vma *vma,
> static void clflush_write32(u32 *addr, u32 value, unsigned int flushes) {
> if (unlikely(flushes & (CLFLUSH_BEFORE | CLFLUSH_AFTER))) {
> - if (flushes & CLFLUSH_BEFORE) {
> - clflushopt(addr);
> - mb();
> - }
> + if (flushes & CLFLUSH_BEFORE)
> + drm_clflush_virt_range(addr, sizeof(addr));
>
> *addr = value;
>
> @@ -1347,7 +1345,7 @@ static void clflush_write32(u32 *addr, u32 value,
> unsigned int flushes)
> * to ensure ordering of clflush wrt to the system.
> */
> if (flushes & CLFLUSH_AFTER)
> - clflushopt(addr);
> + drm_clflush_virt_range(addr, sizeof(addr));
> } else
> *addr = value;
> }
> --
> 2.25.1
