[Mesa-dev] [PATCH] [v2] i965/skl: Disable partial resolve in VC

[Ben Widawsky]

Recomendation [sic] is to set this field to 1 always. Programming it to default
value of 0, may have -ve impact on performance for MSAA WLs.

Another don't suck bit which needs to get set.

Totally untested.

v2: v1 was a mix of two patches. Since 0x7004 is masked, we only need to set it
once at initialization and make sure the pma workaround doesn't set the mask bit
(which it doesn't).
Move LRI to init gpu state (Ken)
Add a comment.

... still untested.

Cc: Kenneth Graunke <kenneth at whitecape.org>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
 src/mesa/drivers/dri/i965/brw_state_upload.c | 10 ++++++++++
 src/mesa/drivers/dri/i965/intel_reg.h        |  1 +
 2 files changed, 11 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_state_upload.c b/src/mesa/drivers/dri/i965/brw_state_upload.c
index 1b84859..c90a34f 100644
--- a/src/mesa/drivers/dri/i965/brw_state_upload.c
+++ b/src/mesa/drivers/dri/i965/brw_state_upload.c
@@ -337,6 +337,16 @@ brw_upload_initial_gpu_state(struct brw_context *brw)
 
    brw_upload_invariant_state(brw);
 
+   /* Recommended optimization for Victim Cache eviction in pixel backend. */
+   if (brw->gen >= 9) {
+      BEGIN_BATCH(3);
+      OUT_BATCH(MI_LOAD_REGISTER_IMM | (3 - 2));
+      OUT_BATCH(GEN7_CACHE_MODE_1);
+      OUT_BATCH((GEN9_PARTIAL_RESOLVE_DISABLE_IN_VC << 16) |
+                GEN9_PARTIAL_RESOLVE_DISABLE_IN_VC);
+      ADVANCE_BATCH();
+   }
+
    if (brw->gen >= 8) {
       gen8_emit_3dstate_sample_pattern(brw);
    }
diff --git a/src/mesa/drivers/dri/i965/intel_reg.h b/src/mesa/drivers/dri/i965/intel_reg.h
index af1c1df..a4bcf3d 100644
--- a/src/mesa/drivers/dri/i965/intel_reg.h
+++ b/src/mesa/drivers/dri/i965/intel_reg.h
@@ -144,5 +144,6 @@
 #define GEN7_CACHE_MODE_1               0x7004
 # define GEN8_HIZ_NP_PMA_FIX_ENABLE        (1 << 11)
 # define GEN8_HIZ_NP_EARLY_Z_FAILS_DISABLE (1 << 13)
+# define GEN9_PARTIAL_RESOLVE_DISABLE_IN_VC (1 << 1)
 # define GEN8_HIZ_PMA_MASK_BITS \
    ((GEN8_HIZ_NP_PMA_FIX_ENABLE | GEN8_HIZ_NP_EARLY_Z_FAILS_DISABLE) << 16)
-- 
2.3.1