On 3/10/2020 5:19 PM, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Certain workloads need the ability to disable preemption completely so
allow them to do that by whitelisting GEN8_CS_CHICKEN1.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Michal Mrozek <michal.mrozek@xxxxxxxxx>
Cc: Tony Ye <tony.ye@xxxxxxxxx>
Cc: Rafael Antognolli <rafael.antognolli@xxxxxxxxx>
Cc: Jason Ekstrand <jason@xxxxxxxxxxxxxx>
---
We need confirmation and acks from all three userspace components here.
Especially since my impression was some are for and some were against
whitelisting this one.
Media doesn't need this for TGL. But it's acceptable if other userspace
wants to whitelist it.
Acked-by: Tony Ye <tony.ye@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_workarounds.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 391f39b1fb26..37becdf77427 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -1276,6 +1276,9 @@ static void tgl_whitelist_build(struct intel_engine_cs *engine)
/* Wa_1806527549:tgl */
whitelist_reg(w, HIZ_CHICKEN);
+
+ /* WaEnablePreemptionGranularityControlByUMD:tgl */
+ whitelist_reg(w, GEN8_CS_CHICKEN1);
break;
default:
break;
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