On 21/09/2017 14:54, Chris Wilson wrote:
Since we inherited the context image setup from gen8 which needed a
per-bb workaround (for GPGPU), we are submitting an empty per-bb buffer
on gen9. Now that we can skip adding the buffer to the context image,
remove the dangling per-bb. This slightly improves execution latency,
most notably on an idle engine.
References: https://bugs.freedesktop.org/show_bug.cgi?id=87725
How much of the 7% we get back? :)
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_lrc.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 297c9c1564e5..91a5411bb9da 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1171,13 +1171,6 @@ static u32 *gen9_init_indirectctx_bb(struct intel_engine_cs *engine, u32 *batch)
return batch;
}
-static u32 *gen9_init_perctx_bb(struct intel_engine_cs *engine, u32 *batch)
-{
- *batch++ = MI_BATCH_BUFFER_END;
-
- return batch;
-}
-
#define CTX_WA_BB_OBJ_SIZE (PAGE_SIZE)
static int lrc_setup_wa_ctx(struct intel_engine_cs *engine)
@@ -1234,7 +1227,7 @@ static int intel_init_workaround_bb(struct intel_engine_cs *engine)
return 0;
case 9:
wa_bb_fn[0] = gen9_init_indirectctx_bb;
- wa_bb_fn[1] = gen9_init_perctx_bb;
+ wa_bb_fn[1] = NULL;
break;
case 8:
wa_bb_fn[0] = gen8_init_indirectctx_bb;
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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