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anv: Enable dynamic stack ID control on Xe3+
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This patch enables dynamic stack ID control on Xe3+.

Programmed values are the recommended settings from the Bspec.

Signed-off-by: Sagar Ghuge <sagar.ghuge@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/41066>
This commit is contained in:
Sagar Ghuge 2026-04-20 13:24:44 -07:00 • committed by Marge Bot
parent acecc0f1b3
commit 12f81eaa88
1 changed files with 31 additions and 0 deletions
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31
src/intel/vulkan/genX_cmd_compute.c
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@ -71,6 +71,10 @@ genX(cmd_buffer_ensure_cfe_state)(struct anv_cmd_buffer *cmd_buffer,
}
#endif
#if GFX_VER >= 30
cfe.DynamicStackIDControl = true;
#endif
cfe.OverDispatchControl = 2; /* 50% overdispatch */
}
@ -1125,6 +1129,28 @@ cmd_buffer_emit_rt_dispatch_globals_indirect(struct anv_cmd_buffer *cmd_buffer,
return rtdg_state;
}
static uint8_t
get_stack_id_reduction_cap(uint32_t stack_ids)
{
/* Bspec 57497: Dynamic stack management mechanism - REDUCTION_CAP
* bitfield states:
*
* This value must always be smaller than value given by
* CFE_STATE.Stack_ID_Control.
*/
#if GFX_VER >= 30
switch (stack_ids) {
case 2048: return REDUCTION_CAP_1024;
case 1024: return REDUCTION_CAP_512;
case 512: return REDUCTION_CAP_256;
case 256: return REDUCTION_CAP_128;
default: UNREACHABLE("Invalid stack_ids value");
}
#endif
return 0;
}
static void
cmd_buffer_trace_rays(struct anv_cmd_buffer *cmd_buffer,
struct trace_params *params)
@ -1309,6 +1335,11 @@ cmd_buffer_trace_rays(struct anv_cmd_buffer *cmd_buffer,
#endif
#if GFX_VER >= 30
btd.RTMemStructures64bModeEnable = true;
btd.DynamicstackmanagementmechanismMISSPENALTY = MISS_PENALTY_16;
btd.DynamicstackmanagementmechanismHITREWARD = HIT_REWARD_1;
btd.DynamicstackmanagementmechanismSCALINGFACTOR = SCALING_FACTOR_4;
btd.DynamicstackmanagementmechanismREDUCTIONCAP =
get_stack_id_reduction_cap(cmd_buffer->device->physical->instance->stack_ids);
#endif
}