[RFC PATCH 04/12] drm/i915: Capture some extra small details in the GPU error state

[Oscar Mateo <oscar.mateo@xxxxxxxxx>]

Namely:
- Capture tiling per drm_i915_error_object
- Capture the LRC descriptor per active request
- Capture the wa_batchbuffer unconditionally
- Capture the GAM_ECOCHK register for all GENs

They don't increase the size greatly, and they can be useful even in
the existing GPU error dump (but I will need them for sure in AubCrash).

Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_drv.h       |  2 ++
 drivers/gpu/drm/i915/i915_gpu_error.c | 25 +++++++++++++++----------
 2 files changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 366ba74..f64871b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -992,6 +992,7 @@ struct i915_gpu_state {
 		struct drm_i915_error_object {
 			u64 gtt_offset;
 			u64 gtt_size;
+			u32 tiling:2;
 			int page_count;
 			int unused;
 			u32 *pages[0];
@@ -1006,6 +1007,7 @@ struct i915_gpu_state {
 			long jiffies;
 			pid_t pid;
 			u32 context;
+			u64 lrc_desc;
 			int priority;
 			int ban_score;
 			u32 seqno;
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 653fb69..befd17c 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -897,6 +897,7 @@ void __i915_gpu_state_free(struct kref *error_ref)
 
 	dst->gtt_offset = vma->node.start;
 	dst->gtt_size = vma->node.size;
+	dst->tiling = i915_gem_object_get_tiling(vma->obj);
 	dst->page_count = 0;
 	dst->unused = 0;
 
@@ -1270,16 +1271,21 @@ static void error_record_engine_registers(struct i915_gpu_state *error,
 static void record_request(struct drm_i915_gem_request *request,
 			   struct drm_i915_error_request *erq)
 {
-	erq->context = request->ctx->hw_id;
+	struct i915_gem_context *ctx = request->ctx;
+	struct intel_engine_cs *engine = request->engine;
+	struct intel_context *ce = &ctx->engine[engine->id];
+
+	erq->context = ctx->hw_id;
+	erq->lrc_desc = ce->lrc_desc;
 	erq->priority = request->priotree.priority;
-	erq->ban_score = atomic_read(&request->ctx->ban_score);
+	erq->ban_score = atomic_read(&ctx->ban_score);
 	erq->seqno = request->global_seqno;
 	erq->jiffies = request->emitted_jiffies;
 	erq->head = request->head;
 	erq->tail = request->tail;
 
 	rcu_read_lock();
-	erq->pid = request->ctx->pid ? pid_nr(request->ctx->pid) : 0;
+	erq->pid = ctx->pid ? pid_nr(ctx->pid) : 0;
 	rcu_read_unlock();
 }
 
@@ -1442,10 +1448,10 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
 				i915_error_object_create(dev_priv,
 							 request->batch);
 
-			if (HAS_BROKEN_CS_TLB(dev_priv))
-				ee->wa_batchbuffer =
-					i915_error_object_create(dev_priv,
-								 engine->scratch);
+			ee->wa_batchbuffer =
+				i915_error_object_create(dev_priv,
+							 engine->scratch);
+
 			request_record_user_bo(request, ee);
 
 			ee->ctx =
@@ -1619,10 +1625,8 @@ static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
 		error->ccid = I915_READ(CCID);
 
 	/* 3: Feature specific registers */
-	if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
-		error->gam_ecochk = I915_READ(GAM_ECOCHK);
+	if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv))
 		error->gac_eco = I915_READ(GAC_ECO_BITS);
-	}
 
 	/* 4: Everything else */
 	if (INTEL_GEN(dev_priv) >= 8) {
@@ -1641,6 +1645,7 @@ static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
 	}
 	error->eir = I915_READ(EIR);
 	error->pgtbl_er = I915_READ(PGTBL_ER);
+	error->gam_ecochk = I915_READ(GAM_ECOCHK);
 }
 
 static void i915_error_capture_msg(struct drm_i915_private *dev_priv,
-- 
1.9.1

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