Re: [PATCH 2/2] drm/i915: Stop capturing semaphore registers for gen6/7 GPU hangs

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On 05/03/2019 15:09, Chris Wilson wrote:
We no longer use the semaphore sync registers on gen6/7, so including
them in the GPU error state is mere noise.

References: 6faf5916e6be ("drm/i915: Remove HW semaphores for gen7 inter-engine synchronisation")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_gpu_error.c | 25 ++-----------------------
  drivers/gpu/drm/i915/i915_gpu_error.h |  1 -
  2 files changed, 2 insertions(+), 24 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index fa86c60fb56c..ececbfd8ee82 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -502,13 +502,6 @@ static void error_print_engine(struct drm_i915_error_state_buf *m,
  	if (INTEL_GEN(m->i915) >= 6) {
  		err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
  		err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
-		err_printf(m, "  SYNC_0: 0x%08x\n",
-			   ee->semaphore_mboxes[0]);
-		err_printf(m, "  SYNC_1: 0x%08x\n",
-			   ee->semaphore_mboxes[1]);
-		if (HAS_VEBOX(m->i915))
-			err_printf(m, "  SYNC_2: 0x%08x\n",
-				   ee->semaphore_mboxes[2]);
  	}
  	if (HAS_PPGTT(m->i915)) {
  		err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
@@ -1138,18 +1131,6 @@ static void gem_record_fences(struct i915_gpu_state *error)
  	error->nfence = i;
  }
-static void gen6_record_semaphore_state(struct intel_engine_cs *engine,
-					struct drm_i915_error_engine *ee)
-{
-	struct drm_i915_private *dev_priv = engine->i915;
-
-	ee->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(engine->mmio_base));
-	ee->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(engine->mmio_base));
-	if (HAS_VEBOX(dev_priv))
-		ee->semaphore_mboxes[2] =
-			I915_READ(RING_SYNC_2(engine->mmio_base));
-}
-
  static void error_record_engine_registers(struct i915_gpu_state *error,
  					  struct intel_engine_cs *engine,
  					  struct drm_i915_error_engine *ee)
@@ -1158,12 +1139,10 @@ static void error_record_engine_registers(struct i915_gpu_state *error,
if (INTEL_GEN(dev_priv) >= 6) {
  		ee->rc_psmi = I915_READ(RING_PSMI_CTL(engine->mmio_base));
-		if (INTEL_GEN(dev_priv) >= 8) {
+		if (INTEL_GEN(dev_priv) >= 8)
  			ee->fault_reg = I915_READ(GEN8_RING_FAULT_REG);
-		} else {
-			gen6_record_semaphore_state(engine, ee);
+		else
  			ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
-		}
  	}
if (INTEL_GEN(dev_priv) >= 4) {
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.h b/drivers/gpu/drm/i915/i915_gpu_error.h
index 8c1569c1830d..99d6b7b270c2 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.h
+++ b/drivers/gpu/drm/i915/i915_gpu_error.h
@@ -111,7 +111,6 @@ struct i915_gpu_state {
  		u32 fault_reg;
  		u64 faddr;
  		u32 rc_psmi; /* sleep state */
-		u32 semaphore_mboxes[I915_NUM_ENGINES - 1];
  		struct intel_instdone instdone;
struct drm_i915_error_context {


Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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