[Intel-gfx] [PATCH] drm/i915: collect more per ring error state

[Daniel Vetter]

Based on a patch by Ben Widawsky, but with different colors
for the bikeshed.

In contrast to Ben's patch this one doesn't add the fault regs.
Afaics they're for the optional page fault support which
- we're not enabling
- and which seems to be unsupported by the hw team. Recent bspec
  lacks tons of information about this that the public docs released
  half a year back still contain.

Also dump ring HEAD/TAIL registers - I've recently seen a few
error_state where just guessing these is not good enough.

v2: Also dump INSTPM for every ring.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/i915_debugfs.c |   13 +++++++------
 drivers/gpu/drm/i915/i915_drv.h     |    7 +++++--
 drivers/gpu/drm/i915/i915_irq.c     |    9 +++++++--
 drivers/gpu/drm/i915/i915_reg.h     |    3 +++
 4 files changed, 22 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index d618f78..043fc52 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -734,17 +734,18 @@ static void i915_ring_error_state(struct seq_file *m,
 				  unsigned ring)
 {
 	seq_printf(m, "%s command stream:\n", ring_str(ring));
+	seq_printf(m, "  HEAD: 0x%08x\n", error->head[ring]);
+	seq_printf(m, "  TAIL: 0x%08x\n", error->tail[ring]);
 	seq_printf(m, "  ACTHD: 0x%08x\n", error->acthd[ring]);
 	seq_printf(m, "  IPEIR: 0x%08x\n", error->ipeir[ring]);
 	seq_printf(m, "  IPEHR: 0x%08x\n", error->ipehr[ring]);
 	seq_printf(m, "  INSTDONE: 0x%08x\n", error->instdone[ring]);
-	if (ring == RCS) {
-		if (INTEL_INFO(dev)->gen >= 4) {
-			seq_printf(m, "  INSTDONE1: 0x%08x\n", error->instdone1);
-			seq_printf(m, "  INSTPS: 0x%08x\n", error->instps);
-		}
-		seq_printf(m, "  INSTPM: 0x%08x\n", error->instpm);
+	if (ring == RCS && INTEL_INFO(dev)->gen >= 4) {
+		seq_printf(m, "  INSTDONE1: 0x%08x\n", error->instdone1);
 	}
+	seq_printf(m, "  INSTPS: 0x%08x\n", error->instps[ring]);
+	seq_printf(m, "  INSTPM: 0x%08x\n", error->instpm[ring]);
+	seq_printf(m, "  FADDR: 0x%08x\n", error->faddr[ring]);
 	seq_printf(m, "  seqno: 0x%08x\n", error->seqno[ring]);
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5f3ff9d..2abd6fd 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -149,16 +149,19 @@ struct drm_i915_error_state {
 	u32 eir;
 	u32 pgtbl_er;
 	u32 pipestat[I915_MAX_PIPES];
+	u32 tail[I915_MAX_PIPES];
+	u32 head[I915_MAX_PIPES];
 	u32 ipeir[I915_NUM_RINGS];
 	u32 ipehr[I915_NUM_RINGS];
 	u32 instdone[I915_NUM_RINGS];
 	u32 acthd[I915_NUM_RINGS];
 	u32 error; /* gen6+ */
-	u32 instpm;
-	u32 instps;
+	u32 instpm[I915_NUM_RINGS];
+	u32 instps[I915_NUM_RINGS];
 	u32 instdone1;
 	u32 seqno[I915_NUM_RINGS];
 	u64 bbaddr;
+	u32 faddr[I915_NUM_RINGS];
 	u64 fence[16];
 	struct timeval time;
 	struct drm_i915_error_object {
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 79aba7f..aa70981 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -878,12 +878,15 @@ static void i915_record_ring_state(struct drm_device *dev,
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 
+	if (INTEL_INFO(dev)->gen >= 6) {
+		error->faddr[ring->id] = I915_READ(RING_DMA_FADD(ring->mmio_base));
+	}
 	if (INTEL_INFO(dev)->gen >= 4) {
 		error->ipeir[ring->id] = I915_READ(RING_IPEIR(ring->mmio_base));
 		error->ipehr[ring->id] = I915_READ(RING_IPEHR(ring->mmio_base));
 		error->instdone[ring->id] = I915_READ(RING_INSTDONE(ring->mmio_base));
+		error->instps[ring->id] = I915_READ(RING_INSTPS(ring->mmio_base));
 		if (ring->id == RCS) {
-			error->instps = I915_READ(INSTPS);
 			error->instdone1 = I915_READ(INSTDONE1);
 			error->bbaddr = I915_READ64(BB_ADDR);
 		}
@@ -894,8 +897,11 @@ static void i915_record_ring_state(struct drm_device *dev,
 		error->bbaddr = 0;
 	}
 
+	error->instpm[ring->id] = I915_READ(RING_INSTPM(ring->mmio_base));
 	error->seqno[ring->id] = dev_priv->ring->get_seqno(ring);
 	error->acthd[ring->id] = intel_ring_get_active_head(ring);
+	error->head[ring->id] = I915_READ_HEAD(ring);
+	error->tail[ring->id] = I915_READ_TAIL(ring);
 }
 
 /**
@@ -935,7 +941,6 @@ static void i915_capture_error_state(struct drm_device *dev)
 	error->pgtbl_er = I915_READ(PGTBL_ER);
 	for_each_pipe(pipe)
 		error->pipestat[pipe] = I915_READ(PIPESTAT(pipe));
-	error->instpm = I915_READ(INSTPM);
 
 	if (INTEL_INFO(dev)->gen >= 6)
 		error->error = I915_READ(ERROR_GEN6);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index bf7923c..d228fab 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -349,6 +349,9 @@
 #define RING_IPEIR(base)	((base)+0x64)
 #define RING_IPEHR(base)	((base)+0x68)
 #define RING_INSTDONE(base)	((base)+0x6c)
+#define RING_INSTPS(base)	((base)+0x70)
+#define RING_DMA_FADD(base)	((base)+0x78)
+#define RING_INSTPM(base)	((base)+0xc0)
 #define INSTPS		0x02070 /* 965+ only */
 #define INSTDONE1	0x0207c /* 965+ only */
 #define ACTHD_I965	0x02074
-- 
1.7.6.4