Mesa (master): intel/devinfo: Compute the correct L3$ size for Gen12

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Module: Mesa
Branch: master
Commit: 86f67952d31554b8b4b5a9943b43ace988c6401f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=86f67952d31554b8b4b5a9943b43ace988c6401f

Author: Jason Ekstrand <jason at jlekstrand.net>
Date:   Mon Apr 27 22:43:42 2020 -0500

intel/devinfo: Compute the correct L3$ size for Gen12

Fixes: 8125d7960b6 "intel/dev: Add preliminary device info for Tigerlake"
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Tested-by: Clayton Craft <clayton.a.craft at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4782>

---

 src/intel/dev/gen_device_info.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/intel/dev/gen_device_info.c b/src/intel/dev/gen_device_info.c
index ef444016e37..299d33f9501 100644
--- a/src/intel/dev/gen_device_info.c
+++ b/src/intel/dev/gen_device_info.c
@@ -1201,6 +1201,17 @@ update_from_topology(struct gen_device_info *devinfo,
       }
    }
 
+   if (devinfo->gen == 12 && devinfo->num_slices == 1) {
+      if (n_subslices >= 6) {
+         assert(n_subslices == 6);
+         devinfo->l3_banks = 8;
+      } else if (n_subslices > 2) {
+         devinfo->l3_banks = 6;
+      } else {
+         devinfo->l3_banks = 4;
+      }
+   }
+
    uint32_t eu_mask_len =
       topology->eu_stride * topology->max_subslices * topology->max_slices;
    assert(sizeof(devinfo->eu_masks) >= eu_mask_len);