[Intel-gfx] [RFC 04/37] drm/i915/error: capture execlist state on error

[John.C.Harrison at Intel.com]

From: Dave Gordon <david.s.gordon at intel.com>

At present, execlist status/ctx_id and CSBs, not the submission queue

For: VIZ-2021
Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |  9 +++++++++
 drivers/gpu/drm/i915/i915_gpu_error.c | 38 +++++++++++++++++++++++++++++++++--
 2 files changed, 45 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 809816a..782591f8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -556,6 +556,15 @@ struct drm_i915_error_state {
 		u32 rc_psmi; /* sleep state */
 		u32 semaphore_mboxes[I915_NUM_RINGS - 1];
 
+		/* Execlists */
+		u32 execlist_status;
+		u32 execlist_ctx_id;
+		u32 execlist_csb_raw_pointer;
+		u32 execlist_csb_write_pointer;
+		u32 execlist_csb_read_pointer;
+		u32 execlist_csb[6];
+		u32 execlist_ctx[6];
+
 		struct drm_i915_error_object {
 			int page_count;
 			u64 gtt_offset;
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 27b6ac9..fcb9487 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -247,6 +247,7 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
 				  int ring_idx)
 {
 	struct drm_i915_error_ring *ring = &error->ring[ring_idx];
+	int i;
 
 	if (!ring->valid)
 		return;
@@ -288,7 +289,6 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
 		err_printf(m, "  GFX_MODE: 0x%08x\n", ring->vm_info.gfx_mode);
 
 		if (INTEL_INFO(dev)->gen >= 8) {
-			int i;
 			for (i = 0; i < 4; i++)
 				err_printf(m, "  PDP%d: 0x%016llx\n",
 					   i, ring->vm_info.pdp[i]);
@@ -304,6 +304,17 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
 	err_printf(m, "  hangcheck: %s [%d]\n",
 		   hangcheck_action_to_str(ring->hangcheck_action),
 		   ring->hangcheck_score);
+
+	err_printf(m, "  EXECLIST_STATUS: 0x%08x\n", ring->execlist_status);
+	err_printf(m, "  EXECLIST_CTX_ID: 0x%08x\n", ring->execlist_ctx_id);
+	err_printf(m, "  EXECLIST_CSBPTR: 0x%08x\n", ring->execlist_csb_raw_pointer);
+	err_printf(m, "  EXECLIST_CSB_WR: 0x%08x\n", ring->execlist_csb_write_pointer);
+	err_printf(m, "  EXECLIST_CSB_RD: 0x%08x\n", ring->execlist_csb_read_pointer);
+
+	for (i = 0; i < 6; i++) {
+		err_printf(m, "  EXECLIST_CSB[%d]: 0x%08x\n", i, ring->execlist_csb[i]);
+		err_printf(m, "  EXECLIST_CTX[%d]: 0x%08x\n", i, ring->execlist_ctx[i]);
+	}
 }
 
 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
@@ -871,6 +882,7 @@ static void i915_record_ring_state(struct drm_device *dev,
 				   struct drm_i915_error_ring *ering)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
+	int i;
 
 	if (INTEL_INFO(dev)->gen >= 6) {
 		ering->rc_psmi = I915_READ(ring->mmio_base + 0x50);
@@ -961,8 +973,26 @@ static void i915_record_ring_state(struct drm_device *dev,
 					I915_READ(GEN8_RING_PDP_LDW(ring, i));
 			}
 	}
-}
 
+	if (i915.enable_execlists) {
+		u32 status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring));
+		u8 write_pointer = status_pointer & 0x07;
+		u8 read_pointer = ring->next_context_status_buffer;
+		if (read_pointer > write_pointer)
+			write_pointer += 6;
+
+		ering->execlist_status = I915_READ(RING_EXECLIST_STATUS_LO(ring));
+		ering->execlist_ctx_id = I915_READ(RING_EXECLIST_STATUS_HI(ring));
+		ering->execlist_csb_raw_pointer = status_pointer;
+		ering->execlist_csb_write_pointer = write_pointer;
+		ering->execlist_csb_read_pointer = read_pointer;
+
+		for (i = 0; i < 6; i++) {
+			ering->execlist_csb[i] = I915_READ(RING_CONTEXT_STATUS_BUF_LO(ring, i));
+			ering->execlist_ctx[i] = I915_READ(RING_CONTEXT_STATUS_BUF_HI(ring, i));
+		}
+	}
+}
 
 static void i915_gem_record_active_context(struct intel_engine_cs *ring,
 					   struct drm_i915_error_state *error,
@@ -1248,6 +1278,10 @@ static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
 	if (HAS_HW_CONTEXTS(dev))
 		error->ccid = I915_READ(CCID);
 
+	if (HAS_LOGICAL_RING_CONTEXTS(dev)) {
+		// Surely something to capture here ...
+	}
+
 	if (INTEL_INFO(dev)->gen >= 8) {
 		error->ier = I915_READ(GEN8_DE_MISC_IER);
 		for (i = 0; i < 4; i++)
-- 
1.9.1