[Intel-gfx] [PATCH 1/4] drm/i915/guc: add doorbell map to debugfs/i915_guc_info

[Dave Gordon]

To properly verify the driver->doorbell->GuC functionality, validation
needs to know how the driver has assigned the doorbell cache lines and
registers, so make them visible through debugfs.

Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index e4f2c55..fbb4b16 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2560,6 +2560,7 @@ static int i915_guc_info(struct seq_file *m, void *data)
 	struct i915_guc_client client = {};
 	struct intel_engine_cs *engine;
 	u64 total = 0;
+	int i;
 
 	if (!HAS_GUC_SCHED(dev_priv))
 		return 0;
@@ -2574,6 +2575,14 @@ static int i915_guc_info(struct seq_file *m, void *data)
 
 	mutex_unlock(&dev->struct_mutex);
 
+	seq_printf(m, "Doorbell map:\n");
+	BUILD_BUG_ON(ARRAY_SIZE(guc.doorbell_bitmap) % 4);
+	for (i = 0; i < ARRAY_SIZE(guc.doorbell_bitmap) - 3; i += 4)
+		seq_printf(m, "\t%016lx %016lx %016lx %016lx\n",
+			guc.doorbell_bitmap[i], guc.doorbell_bitmap[i+1],
+			guc.doorbell_bitmap[i+2], guc.doorbell_bitmap[i+3]);
+	seq_printf(m, "Doorbell next cacheline: 0x%x\n\n", guc.db_cacheline);
+
 	seq_printf(m, "GuC total action count: %llu\n", guc.action_count);
 	seq_printf(m, "GuC action failure count: %u\n", guc.action_fail);
 	seq_printf(m, "GuC last action command: 0x%x\n", guc.action_cmd);
-- 
1.9.1