drm/i915: Extract reading INSTDONE

INSTDONE is used in many places, and it varies from generation to
generation. This provides a good reason for us to extract the logic to
read the relevant information.

The patch has no functional change. It's prep for some new stuff.

v2: move the memset inside of i915_get_extra_instdone (Jani)
v3,4: bugs caught by (Jani)
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_irq.c

@@ -1070,6 +1070,23 @@ i915_error_first_batchbuffer(struct drm_i915_private *dev_priv,
 	return NULL;
 }
 
+/* NB: please notice the memset */
+static void i915_get_extra_instdone(struct drm_device *dev,
+				    uint32_t *instdone)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	memset(instdone, 0, sizeof(*instdone) * I915_NUM_INSTDONE_REG);
+
+	if (INTEL_INFO(dev)->gen < 4) {
+		instdone[0] = I915_READ(INSTDONE);
+		instdone[1] = 0;
+	} else {
+		instdone[0] = I915_READ(INSTDONE_I965);
+		instdone[1] = I915_READ(INSTDONE1);
+	}
+}
+
+
 static void i915_record_ring_state(struct drm_device *dev,
 				   struct drm_i915_error_state *error,
 				   struct intel_ring_buffer *ring)
@@ -1288,6 +1305,7 @@ void i915_destroy_error_state(struct drm_device *dev)
 static void i915_report_and_clear_eir(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	uint32_t instdone[I915_NUM_INSTDONE_REG];
 	u32 eir = I915_READ(EIR);
 	int pipe;
 
@@ -1296,16 +1314,17 @@ static void i915_report_and_clear_eir(struct drm_device *dev)
 
 	pr_err("render error detected, EIR: 0x%08x\n", eir);
 
+	i915_get_extra_instdone(dev, instdone);
+
 	if (IS_G4X(dev)) {
 		if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
 			u32 ipeir = I915_READ(IPEIR_I965);
 
 			pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
 			pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
-			pr_err("  INSTDONE: 0x%08x\n",
-			       I915_READ(INSTDONE_I965));
+			pr_err("  INSTDONE: 0x%08x\n", instdone[0]);
 			pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
-			pr_err("  INSTDONE1: 0x%08x\n", I915_READ(INSTDONE1));
+			pr_err("  INSTDONE1: 0x%08x\n", instdone[1]);
 			pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
 			I915_WRITE(IPEIR_I965, ipeir);
 			POSTING_READ(IPEIR_I965);
@@ -1344,7 +1363,7 @@ static void i915_report_and_clear_eir(struct drm_device *dev)
 
 			pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR));
 			pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR));
-			pr_err("  INSTDONE: 0x%08x\n", I915_READ(INSTDONE));
+			pr_err("  INSTDONE: 0x%08x\n", instdone[0]);
 			pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD));
 			I915_WRITE(IPEIR, ipeir);
 			POSTING_READ(IPEIR);
@@ -1353,10 +1372,9 @@ static void i915_report_and_clear_eir(struct drm_device *dev)
 
 			pr_err("  IPEIR: 0x%08x\n", I915_READ(IPEIR_I965));
 			pr_err("  IPEHR: 0x%08x\n", I915_READ(IPEHR_I965));
-			pr_err("  INSTDONE: 0x%08x\n",
-			       I915_READ(INSTDONE_I965));
+			pr_err("  INSTDONE: 0x%08x\n", instdone[0]);
 			pr_err("  INSTPS: 0x%08x\n", I915_READ(INSTPS));
-			pr_err("  INSTDONE1: 0x%08x\n", I915_READ(INSTDONE1));
+			pr_err("  INSTDONE1: 0x%08x\n", instdone[1]);
 			pr_err("  ACTHD: 0x%08x\n", I915_READ(ACTHD_I965));
 			I915_WRITE(IPEIR_I965, ipeir);
 			POSTING_READ(IPEIR_I965);
@@ -1671,7 +1689,7 @@ void i915_hangcheck_elapsed(unsigned long data)
 {
 	struct drm_device *dev = (struct drm_device *)data;
 	drm_i915_private_t *dev_priv = dev->dev_private;
-	uint32_t acthd[I915_NUM_RINGS], instdone, instdone1;
+	uint32_t acthd[I915_NUM_RINGS], instdone[I915_NUM_INSTDONE_REG];
 	struct intel_ring_buffer *ring;
 	bool err = false, idle;
 	int i;
@@ -1699,25 +1717,19 @@ void i915_hangcheck_elapsed(unsigned long data)
 		return;
 	}
 
-	if (INTEL_INFO(dev)->gen < 4) {
-		instdone = I915_READ(INSTDONE);
-		instdone1 = 0;
-	} else {
-		instdone = I915_READ(INSTDONE_I965);
-		instdone1 = I915_READ(INSTDONE1);
-	}
+	i915_get_extra_instdone(dev, instdone);
 
 	if (memcmp(dev_priv->last_acthd, acthd, sizeof(acthd)) == 0 &&
-	    dev_priv->last_instdone == instdone &&
-	    dev_priv->last_instdone1 == instdone1) {
+	    dev_priv->last_instdone == instdone[0] &&
+	    dev_priv->last_instdone1 == instdone[1]) {
 		if (i915_hangcheck_hung(dev))
 			return;
 	} else {
 		dev_priv->hangcheck_count = 0;
 
 		memcpy(dev_priv->last_acthd, acthd, sizeof(acthd));
-		dev_priv->last_instdone = instdone;
-		dev_priv->last_instdone1 = instdone1;
+		dev_priv->last_instdone = instdone[0];
+		dev_priv->last_instdone1 = instdone[1];
 	}
 
 repeat:

drivers/gpu/drm/i915/i915_reg.h

@@ -478,6 +478,7 @@
 #define IPEIR_I965	0x02064
 #define IPEHR_I965	0x02068
 #define INSTDONE_I965	0x0206c
+#define I915_NUM_INSTDONE_REG	2
 #define RING_IPEIR(base)	((base)+0x64)
 #define RING_IPEHR(base)	((base)+0x68)
 #define RING_INSTDONE(base)	((base)+0x6c)