[PATCH v11 05/15] drm/i915/guc: Introduce intel_uc_sanitize

[Sagar Arun Kamble]

Currently GPU is reset at the end of suspend via i915_gem_sanitize.
On resume, GuC will not be loaded until intel_uc_init_hw happens
during GEM resume flow but action to exit sleep can be sent to GuC
considering the FW load status. To make sure we don't invoke that
action update GuC FW load status at the end of GPU reset as NONE.
load_status indicates HW state and it is sanitized through this new
function intel_uc_sanitize.

v2: Rebase.

v3: Removed intel_guc_sanitize. Marking load status as NONE at the
GPU reset point. (Chris/Michal)

v4: Reinstated the uC function intel_uc_sanitize. (Michal Wajdeczko)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_uc.c     | 12 ++++++++++++
 drivers/gpu/drm/i915/intel_uc.h     |  1 +
 drivers/gpu/drm/i915/intel_uncore.c |  3 +++
 3 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 80251ec..ab26232 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -508,6 +508,18 @@ int intel_uc_resume(struct drm_i915_private *dev_priv)
 	return intel_guc_resume(dev_priv);
 }
 
+void intel_uc_sanitize(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * FIXME: intel_uc_resume currently depends on load_status to resume
+	 * GuC. Since we are resetting Full GPU at the end of suspend, let us
+	 * mark the load status as NONE. Once intel_uc_resume is updated to take
+	 * into consideration GuC load state based on WOPCM, we can skip this
+	 * state update.
+	 */
+	dev_priv->guc.fw.load_status = INTEL_UC_FIRMWARE_NONE;
+}
+
 int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len)
 {
 	WARN(1, "Unexpected send: action=%#x\n", *action);
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 0a79e17..ce3cea5 100644
--- a/drivers/gpu/drm/i915/intel_uc.h
+++ b/drivers/gpu/drm/i915/intel_uc.h
@@ -212,6 +212,7 @@ struct intel_huc {
 int intel_uc_runtime_resume(struct drm_i915_private *dev_priv);
 int intel_uc_suspend(struct drm_i915_private *dev_priv);
 int intel_uc_resume(struct drm_i915_private *dev_priv);
+void intel_uc_sanitize(struct drm_i915_private *dev_priv);
 int intel_guc_sample_forcewake(struct intel_guc *guc);
 int intel_guc_send_nop(struct intel_guc *guc, const u32 *action, u32 len);
 int intel_guc_send_mmio(struct intel_guc *guc, const u32 *action, u32 len);
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index b3c3f94..acab013 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1763,6 +1763,9 @@ int intel_gpu_reset(struct drm_i915_private *dev_priv, unsigned engine_mask)
 	}
 	intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
 
+	if (engine_mask == ALL_ENGINES)
+		intel_uc_sanitize(dev_priv);
+
 	return ret;
 }
 
-- 
1.9.1