[Mesa-dev] [PATCH v2 27/27] i965: Advertise the CCS modifier

[Jason Ekstrand]

From: Ben Widawsky <ben at bwidawsk.net>

v2: Rename modifier to be more smart (Jason)

FINISHME: Use the kernel's final choice for the fb modifier

bwidawsk at norris2:~/intel-gfx/kmscube (modifiers $) ~/scripts/measure_bandwidth.sh ./kmscube none
Read bandwidth: 603.91 MiB/s
Write bandwidth: 615.28 MiB/s
bwidawsk at norris2:~/intel-gfx/kmscube (modifiers $) ~/scripts/measure_bandwidth.sh ./kmscube ytile
Read bandwidth: 571.13 MiB/s
Write bandwidth: 555.51 MiB/s
bwidawsk at norris2:~/intel-gfx/kmscube (modifiers $) ~/scripts/measure_bandwidth.sh ./kmscube ccs
Read bandwidth: 259.34 MiB/s
Write bandwidth: 337.83 MiB/s

v2: Move all references to the new fourcc code(s) to this patch.
v3: Rebase, remove Yf_CCS (Daniel)

Cc: Jason Ekstrand <jason at jlekstrand.net>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Acked-by: Daniel Stone <daniels at collabora.com>
---
 src/mesa/drivers/dri/i965/intel_screen.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index 323cd5a..1729f6a 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -51,6 +51,10 @@
 #define DRM_FORMAT_MOD_LINEAR 0
 #endif
 
+#ifndef I915_FORMAT_MOD_Y_TILED_CCS
+#define I915_FORMAT_MOD_Y_TILED_CCS fourcc_mod_code(INTEL, 4)
+#endif
+
 static const __DRIconfigOptionsExtension brw_config_options = {
    .base = { __DRI_CONFIG_OPTIONS, 1 },
    .xml =
@@ -303,6 +307,8 @@ static const struct {
      .since_gen = 1 },
    { .tiling = I915_TILING_Y, .modifier = I915_FORMAT_MOD_Y_TILED,
      .since_gen = 6 },
+   { .tiling = I915_TILING_Y, .modifier = I915_FORMAT_MOD_Y_TILED_CCS,
+     .since_gen = 9 },
 };
 
 static bool
@@ -566,6 +572,7 @@ enum modifier_priority {
    MODIFIER_PRIORITY_LINEAR,
    MODIFIER_PRIORITY_X,
    MODIFIER_PRIORITY_Y,
+   MODIFIER_PRIORITY_Y_CCS,
 };
 
 const uint64_t priority_to_modifier[] = {
@@ -573,6 +580,7 @@ const uint64_t priority_to_modifier[] = {
    [MODIFIER_PRIORITY_LINEAR] = DRM_FORMAT_MOD_LINEAR,
    [MODIFIER_PRIORITY_X] = I915_FORMAT_MOD_X_TILED,
    [MODIFIER_PRIORITY_Y] = I915_FORMAT_MOD_Y_TILED,
+   [MODIFIER_PRIORITY_Y_CCS] =  /* I915_FORMAT_MOD_Y_TILED_CCS */ fourcc_mod_code(INTEL, 4),
 };
 
 static uint64_t
@@ -584,6 +592,9 @@ select_best_modifier(struct gen_device_info *devinfo,
 
    for (int i = 0; i < count; i++) {
       switch (modifiers[i]) {
+      case /* I915_FORMAT_MOD_Y_TILED_CCS */ fourcc_mod_code(INTEL, 4):
+         prio = MAX2(prio, MODIFIER_PRIORITY_Y_CCS);
+         break;
       case I915_FORMAT_MOD_Y_TILED:
          prio = MAX2(prio, MODIFIER_PRIORITY_Y);
          break;
-- 
2.5.0.400.gff86faf