intel: Increase Gen11 compute shader scratch IDs to 64.

From the MEDIA_VFE_STATE docs:

   "Starting with this configuration, the Maximum Number of Threads must
    be set to (#EU * 8) for GPGPU dispatches.

    Although there are only 7 threads per EU in the configuration, the
    FFTID is calculated as if there are 8 threads per EU, which in turn
    requires a larger amount of Scratch Space to be allocated by the
    driver."

It's pretty clear that we need to increase this for scratch address
calculations, because the FFTID has a certain bit-pattern.  The quote
above seems to indicate that we should increase the actual thread count
programmed in MEDIA_VFE_STATE as well, but we think the intention is to
only bump the scratch space.

Fixes GPU hangs in Bioshock Infinite and Synmark's CSDof on Icelake 8x8.

Fixes: 5ac804bd9ac ("intel: Add a preliminary device for Ice Lake")
Reviewed-by: Matt Turner <[email protected]>

1 files changed, 13 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_program.c b/src/mesa/drivers/dri/i965/brw_program.c
index 8d1d576b87d..16762fc661b 100644
--- a/src/mesa/drivers/dri/i965/brw_program.c
+++ b/src/mesa/drivers/dri/i965/brw_program.c
@@ -464,7 +464,19 @@ brw_alloc_stage_scratch(struct brw_context *brw,
          subslices = 4 * brw->screen->devinfo.num_slices;
 
       unsigned scratch_ids_per_subslice;
-      if (devinfo->is_haswell) {
+      if (devinfo->gen >= 11) {
+         /* The MEDIA_VFE_STATE docs say:
+          *
+          *    "Starting with this configuration, the Maximum Number of
+          *     Threads must be set to (#EU * 8) for GPGPU dispatches.
+          *
+          *     Although there are only 7 threads per EU in the configuration,
+          *     the FFTID is calculated as if there are 8 threads per EU,
+          *     which in turn requires a larger amount of Scratch Space to be
+          *     allocated by the driver."
+          */
+         scratch_ids_per_subslice = 8 * 8;
+      } else if (devinfo->is_haswell) {
          /* WaCSScratchSize:hsw
           *
           * Haswell's scratch space address calculation appears to be sparse