Mesa (master): i965: Set subslice_total on Gen7/7.5 platforms.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 9cd8f95809c21330e4ccbfbe80ee2eea0f7906ae
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=9cd8f95809c21330e4ccbfbe80ee2eea0f7906ae

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Wed Jun  8 23:36:16 2016 -0700

i965: Set subslice_total on Gen7/7.5 platforms.

We'll use this for compute shader thread counts and scratch space
calculations shortly.

Note that subslices are referred to as "half slices" on Ivybridge.

Cc: "12.0" <mesa-stable at lists.freedesktop.org>
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Francisco Jerez <currojerez at riseup.net>
Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

---

 src/mesa/drivers/dri/i965/intel_screen.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/mesa/drivers/dri/i965/intel_screen.c b/src/mesa/drivers/dri/i965/intel_screen.c
index aa072fa..869119b 100644
--- a/src/mesa/drivers/dri/i965/intel_screen.c
+++ b/src/mesa/drivers/dri/i965/intel_screen.c
@@ -1567,8 +1567,11 @@ __DRIconfig **intelInitScreen2(__DRIscreen *psp)
    intelScreen->hw_has_timestamp = intel_detect_timestamp(intelScreen);
 
    /* GENs prior to 8 do not support EU/Subslice info */
-   if (intelScreen->devinfo->gen >= 8)
+   if (intelScreen->devinfo->gen >= 8) {
       intel_detect_sseu(intelScreen);
+   } else if (intelScreen->devinfo->gen == 7) {
+      intelScreen->subslice_total = 1 << (intelScreen->devinfo->gt - 1);
+   }
 
    const char *force_msaa = getenv("INTEL_FORCE_MSAA");
    if (force_msaa) {