drm/i915: Record BLT engine error state

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/i915_debugfs.c

@@ -616,21 +616,28 @@ static int i915_error_state(struct seq_file *m, void *unused)
 	seq_printf(m, "Time: %ld s %ld us\n", error->time.tv_sec,
 		   error->time.tv_usec);
 	seq_printf(m, "PCI ID: 0x%04x\n", dev->pci_device);
+	seq_printf(m, "EIR: 0x%08x\n", error->eir);
+	seq_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
 	if (INTEL_INFO(dev)->gen >= 6) {
 		seq_printf(m, "ERROR: 0x%08x\n", error->error);
+		seq_printf(m, "Blitter command stream:\n");
+		seq_printf(m, "  ACTHD:    0x%08x\n", error->bcs_acthd);
+		seq_printf(m, "  IPEHR:    0x%08x\n", error->bcs_ipehr);
+		seq_printf(m, "  IPEIR:    0x%08x\n", error->bcs_ipeir);
+		seq_printf(m, "  INSTDONE: 0x%08x\n", error->bcs_instdone);
+		seq_printf(m, "  seqno:    0x%08x\n", error->bcs_seqno);
 	}
-	seq_printf(m, "EIR: 0x%08x\n", error->eir);
-	seq_printf(m, "  PGTBL_ER: 0x%08x\n", error->pgtbl_er);
-	seq_printf(m, "  INSTPM: 0x%08x\n", error->instpm);
+	seq_printf(m, "Render command stream:\n");
+	seq_printf(m, "  ACTHD: 0x%08x\n", error->acthd);
 	seq_printf(m, "  IPEIR: 0x%08x\n", error->ipeir);
 	seq_printf(m, "  IPEHR: 0x%08x\n", error->ipehr);
 	seq_printf(m, "  INSTDONE: 0x%08x\n", error->instdone);
-	seq_printf(m, "  ACTHD: 0x%08x\n", error->acthd);
 	if (INTEL_INFO(dev)->gen >= 4) {
-		seq_printf(m, "  INSTPS: 0x%08x\n", error->instps);
 		seq_printf(m, "  INSTDONE1: 0x%08x\n", error->instdone1);
+		seq_printf(m, "  INSTPS: 0x%08x\n", error->instps);
 	}
-	seq_printf(m, "seqno: 0x%08x\n", error->seqno);
+	seq_printf(m, "  INSTPM: 0x%08x\n", error->instpm);
+	seq_printf(m, "  seqno: 0x%08x\n", error->seqno);
 
 	if (error->active_bo_count) {
 		seq_printf(m, "Buffers [%d]:\n", error->active_bo_count);

drivers/gpu/drm/i915/i915_drv.h

@@ -142,13 +142,18 @@ struct sdvo_device_mapping {
 struct drm_i915_error_state {
 	u32 eir;
 	u32 pgtbl_er;
-	u32 error; /* gen6+ */
 	u32 pipeastat;
 	u32 pipebstat;
 	u32 ipeir;
 	u32 ipehr;
 	u32 instdone;
 	u32 acthd;
+	u32 error; /* gen6+ */
+	u32 bcs_acthd; /* gen6+ blt engine */
+	u32 bcs_ipehr;
+	u32 bcs_ipeir;
+	u32 bcs_instdone;
+	u32 bcs_seqno;
 	u32 instpm;
 	u32 instps;
 	u32 instdone1;

drivers/gpu/drm/i915/i915_irq.c

@@ -595,6 +595,13 @@ static void i915_capture_error_state(struct drm_device *dev)
 	error->error = 0;
 	if (INTEL_INFO(dev)->gen >= 6) {
 		error->error = I915_READ(ERROR_GEN6);
+		error->bcs_acthd = I915_READ(BCS_ACTHD);
+		error->bcs_ipehr = I915_READ(BCS_IPEHR);
+		error->bcs_ipeir = I915_READ(BCS_IPEIR);
+		error->bcs_instdone = I915_READ(BCS_INSTDONE);
+		error->bcs_seqno = 0;
+		if (dev_priv->blt_ring.get_seqno)
+			error->bcs_seqno = dev_priv->blt_ring.get_seqno(&dev_priv->blt_ring);
 	}
 	if (INTEL_INFO(dev)->gen >= 4) {
 		error->ipeir = I915_READ(IPEIR_I965);

drivers/gpu/drm/i915/i915_reg.h

@@ -305,6 +305,10 @@
 #define INSTDONE	0x02090
 #define NOPID		0x02094
 #define HWSTAM		0x02098
+#define BCS_INSTDONE	0x2206C
+#define BCS_IPEIR	0x22064
+#define BCS_IPEHR	0x22068
+#define BCS_ACTHD	0x22074
 
 #define ERROR_GEN6	0x040a0