[RFC 12/12] drm/i915: Forcefully flush GuC log buffer on reset

[akash.goel@intel.com]

From: Sagar Arun Kamble <sagar.a.kamble@intel.com>

If GuC logs are being captured, there should be a force log buffer flush
action sent to GuC before proceeding with GPU reset and re-initializing
GUC. Those logs would be useful to understand why the GPU reset was
initiated.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Akash Goel <akash.goel@intel.com>
---
 drivers/gpu/drm/i915/i915_guc_submission.c | 18 ++++++++++++++++++
 drivers/gpu/drm/i915/i915_irq.c            |  3 +++
 drivers/gpu/drm/i915/intel_guc.h           |  1 +
 3 files changed, 22 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index f20e352..72506f0 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -1402,6 +1402,24 @@ int intel_guc_resume(struct drm_device *dev)
 	return host2guc_action(guc, data, ARRAY_SIZE(data));
 }
 
+int i915_guc_log_buffer_force_flush(struct drm_device *dev)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_guc *guc = &dev_priv->guc;
+	u32 data[2];
+	int ret = 0;
+
+	data[0] = HOST2GUC_ACTION_FORCE_LOGBUFFERFLUSH;
+	data[1] = 0;
+
+	if (host2guc_action(guc, data, 2)) {
+		ret = -EINVAL;
+		DRM_ERROR("Failed\n");
+	}
+
+	return ret;
+}
+
 void i915_guc_capture_logs(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6cea65b..a78db29 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2812,6 +2812,9 @@ void i915_handle_error(struct drm_i915_private *dev_priv,
 	vscnprintf(error_msg, sizeof(error_msg), fmt, args);
 	va_end(args);
 
+	flush_work(&dev_priv->guc.events_work);
+	i915_guc_log_buffer_force_flush(dev_priv->dev);
+
 	i915_capture_error_state(dev_priv, engine_mask, error_msg);
 	i915_report_and_clear_eir(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/intel_guc.h b/drivers/gpu/drm/i915/intel_guc.h
index 5bb44b5..e3c4e08 100644
--- a/drivers/gpu/drm/i915/intel_guc.h
+++ b/drivers/gpu/drm/i915/intel_guc.h
@@ -188,6 +188,7 @@ int i915_guc_wq_check_space(struct drm_i915_gem_request *rq);
 int i915_guc_submit(struct drm_i915_gem_request *rq);
 void i915_guc_submission_disable(struct drm_device *dev);
 void i915_guc_submission_fini(struct drm_device *dev);
+int i915_guc_log_buffer_force_flush(struct drm_device *dev);
 void i915_guc_capture_logs(struct drm_device *dev);
 ssize_t i915_guc_read_logs(struct intel_guc_log_client *log_client,
 			   size_t count, uint32_t f_flags);
-- 
1.9.2

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