drm/i915/gen9: add WaClearFlowControlGpgpuContextSave
This allows writes to EU flow control registers. Together
with SIP code from the user-mode driver this resolves a
hang seen in some pre-emption scenarios. Note that this
patch is just the kernel mode part of this workaround.
v2. Oops, add FLOW_CONTROL_ENABLE macro to i915_reg.h.
Signed-off-by: Tim Gore <tim.gore@intel.com>
Reviewed-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458144826-17269-1-git-send-email-tim.gore@intel.com
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 07e0449..264885f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7105,6 +7105,7 @@
#define GEN9_CCS_TLB_PREFETCH_ENABLE (1<<3)
#define GEN8_ROW_CHICKEN _MMIO(0xe4f0)
+#define FLOW_CONTROL_ENABLE (1<<15)
#define PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE (1<<8)
#define STALL_DOP_GATING_DISABLE (1<<5)
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index b7c8fc1..9c59ede 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -925,8 +925,10 @@
I915_WRITE(GAM_ECOCHK, I915_READ(GAM_ECOCHK) |
ECOCHK_DIS_TLB);
+ /* WaClearFlowControlGpgpuContextSave:skl,bxt */
/* WaDisablePartialInstShootdown:skl,bxt */
WA_SET_BIT_MASKED(GEN8_ROW_CHICKEN,
+ FLOW_CONTROL_ENABLE |
PARTIAL_INSTRUCTION_SHOOTDOWN_DISABLE);
/* Syncing dependencies between camera and graphics:skl,bxt */