drm/i915: Include the last semaphore sync point in the error-state

Should be useful to know what the driver thought the other ring's seqno
was when it last used a semaphore.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

3 files changed, 9 insertions, 4 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 4568e7d8a06..8afc0dd7de6 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -655,10 +655,12 @@ static void i915_ring_error_state(struct seq_file *m,
         if (INTEL_INFO(dev)->gen >= 6) {
                 seq_printf(m, "  RC PSMI: 0x%08x\n", error->rc_psmi[ring]);
                 seq_printf(m, "  FAULT_REG: 0x%08x\n", error->fault_reg[ring]);
-                seq_printf(m, "  SYNC_0: 0x%08x\n",
-                           error->semaphore_mboxes[ring][0]);
-                seq_printf(m, "  SYNC_1: 0x%08x\n",
-                           error->semaphore_mboxes[ring][1]);
+                seq_printf(m, "  SYNC_0: 0x%08x [last synced 0x%08x]\n",
+                           error->semaphore_mboxes[ring][0],
+                           error->semaphore_seqno[ring][0]);
+                seq_printf(m, "  SYNC_1: 0x%08x [last synced 0x%08x]\n",
+                           error->semaphore_mboxes[ring][1],
+                           error->semaphore_seqno[ring][1]);
         }
         seq_printf(m, "  seqno: 0x%08x\n", error->seqno[ring]);
         seq_printf(m, "  waiting: %s\n", yesno(error->waiting[ring]));
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 45491c1ac7d..79589bbff3d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -197,6 +197,7 @@ struct drm_i915_error_state {
         u32 instdone[I915_NUM_RINGS];
         u32 acthd[I915_NUM_RINGS];
         u32 semaphore_mboxes[I915_NUM_RINGS][I915_NUM_RINGS - 1];
+        u32 semaphore_seqno[I915_NUM_RINGS][I915_NUM_RINGS - 1];
         u32 rc_psmi[I915_NUM_RINGS]; /* sleep state */
         /* our own tracking of ring head and tail */
         u32 cpu_ring_head[I915_NUM_RINGS];
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 2604867e6b7..6cd3dc94b47 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1120,6 +1120,8 @@ static void i915_record_ring_state(struct drm_device *dev,
                         = I915_READ(RING_SYNC_0(ring->mmio_base));
                 error->semaphore_mboxes[ring->id][1]
                         = I915_READ(RING_SYNC_1(ring->mmio_base));
+                error->semaphore_seqno[ring->id][0] = ring->sync_seqno[0];
+                error->semaphore_seqno[ring->id][1] = ring->sync_seqno[1];
         }
 
         if (INTEL_INFO(dev)->gen >= 4) {