On 05/06/2015 15:48, Ville Syrjälä wrote:
On Fri, Jun 05, 2015 at 02:56:48PM +0100, Arun Siluvery wrote:
In Indirect context w/a batch buffer,
+WaFlushCoherentL3CacheLinesAtContextSwitch
Signed-off-by: Rafael Barbalho <rafael.barba...@intel.com>
Signed-off-by: Arun Siluvery <arun.siluv...@linux.intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 1 +
drivers/gpu/drm/i915/intel_lrc.c | 8 ++++++++
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 84af255..5203c79 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -426,6 +426,7 @@
#define PIPE_CONTROL_INDIRECT_STATE_DISABLE (1<<9)
#define PIPE_CONTROL_NOTIFY (1<<8)
#define PIPE_CONTROL_FLUSH_ENABLE (1<<7) /* gen7+ */
+#define PIPE_CONTROL_DC_FLUSH_ENABLE (1<<5)
#define PIPE_CONTROL_VF_CACHE_INVALIDATE (1<<4)
#define PIPE_CONTROL_CONST_CACHE_INVALIDATE (1<<3)
#define PIPE_CONTROL_STATE_CACHE_INVALIDATE (1<<2)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index a71eb81..9d8cf65c 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1101,6 +1101,14 @@ static int gen8_init_indirectctx_bb(struct
intel_engine_cs *ring)
/* WaDisableCtxRestoreArbitration:bdw,chv */
cmd[index++] = MI_ARB_ON_OFF | MI_ARB_DISABLE;
+ /* WaFlushCoherentL3CacheLinesAtContextSwitch:bdw,chv */
+ cmd[index++] = GFX_OP_PIPE_CONTROL(6);
+ cmd[index++] = PIPE_CONTROL_DC_FLUSH_ENABLE;
+ cmd[index++] = 0;
+ cmd[index++] = 0;
+ cmd[index++] = 0;
+ cmd[index++] = 0;
+
This looks incomplete. Seems like you should have LRIs around this
guy to enable/disable the L3SQCREG4 coherent line flush bit.
And chv shouldn't do coherent L3, so this might not be needed there.
I checked with HW team and yes I need to add LRIs to enable/disable
L3SQCREG4 coherent line flush bit.
As you mentioned, it is not required for CHV.
Also do we need a CS stall here too?
"DC Flush Enable 5 Requires stall bit ([20] of DW) set for all GPGPU and Media
Workloads."
I didn't check the restrictions of this bit, will check again and correc
this.
regards
Arun
Supposedly we should add the DC flush to the normal ring flush hooks
too. But that's a separate issue.
/* padding */
while (index < end)
cmd[index++] = MI_NOOP;
--
2.3.0
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