[Intel-gfx] [PATCH v4 5/9] drm/i915/guc: Disable GuC submission and suspend it prior to i915 reset

[Sagar Arun Kamble]

Before i915 reset we need to disable GuC submission and suspend GuC
operarions as it is recreated during intel_uc_init_hw. We can't reuse the
intel_uc_suspend functionality as reset path already holds struct_mutex.

v2: Rebase w.r.t removal of GuC code restructuring. Updated reset_prepare
function as struct_mutex is not needed.

Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
---
 drivers/gpu/drm/i915/i915_gem.c |  2 ++
 drivers/gpu/drm/i915/intel_uc.c | 14 ++++++++++++++
 drivers/gpu/drm/i915/intel_uc.h |  1 +
 3 files changed, 17 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dd56d45..76e1bb2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2847,6 +2847,8 @@ int i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
 
 	i915_gem_revoke_fences(dev_priv);
 
+	intel_uc_reset_prepare(dev_priv);
+
 	return err;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_uc.c b/drivers/gpu/drm/i915/intel_uc.c
index 0c7e45c7..aac8526 100644
--- a/drivers/gpu/drm/i915/intel_uc.c
+++ b/drivers/gpu/drm/i915/intel_uc.c
@@ -671,3 +671,17 @@ int intel_uc_resume(struct drm_i915_private *dev_priv)
 {
 	return 0;
 }
+
+int intel_uc_reset_prepare(struct drm_i915_private *dev_priv)
+{
+	int ret;
+
+	if (i915.enable_guc_submission)
+		i915_guc_submission_disable(dev_priv);
+
+	ret = intel_uc_runtime_suspend(dev_priv);
+	if (ret)
+		return ret;
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/i915/intel_uc.h b/drivers/gpu/drm/i915/intel_uc.h
index 5f49d13..069c2b2 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);
+int intel_uc_reset_prepare(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);
-- 
1.9.1