[PATCH v8 2/8] drm/i915: Update GEM suspend/resume flows considering GuC and GEM fences

[Sagar Arun Kamble <sagar.a.kamble@intel.com>]

This patch moves GuC suspend/resume handlers to corresponding GEM handlers
and orders them properly in the runtime and system suspend/resume flows.
It also adds documentation for GEM suspend/resume handlers.
i915_gem_restore_fences is GEM resumption task hence it is moved to
i915_gem_resume from i915_restore_state.

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c     |  6 -----
 drivers/gpu/drm/i915/i915_gem.c     | 47 ++++++++++++++++++++++++++++++++++---
 drivers/gpu/drm/i915/i915_suspend.c |  2 --
 3 files changed, 44 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index a3bbf18..8d67b8c 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1698,8 +1698,6 @@ static int i915_drm_resume(struct drm_device *dev)
 	}
 	mutex_unlock(&dev->struct_mutex);
 
-	intel_guc_resume(dev_priv);
-
 	intel_modeset_init_hw(dev);
 
 	spin_lock_irq(&dev_priv->irq_lock);
@@ -2504,8 +2502,6 @@ static int intel_runtime_suspend(struct device *kdev)
 		return ret;
 	}
 
-	intel_guc_suspend(dev_priv);
-
 	intel_runtime_pm_disable_interrupts(dev_priv);
 
 	ret = 0;
@@ -2591,8 +2587,6 @@ static int intel_runtime_resume(struct device *kdev)
 	if (intel_uncore_unclaimed_mmio(dev_priv))
 		DRM_DEBUG_DRIVER("Unclaimed access during suspend, bios?\n");
 
-	intel_guc_resume(dev_priv);
-
 	if (IS_GEN9_LP(dev_priv)) {
 		bxt_disable_dc9(dev_priv);
 		bxt_display_core_init(dev_priv, true);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dbe181b..5dcd8c0 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2022,11 +2022,22 @@ int i915_gem_fault(struct vm_fault *vmf)
 	intel_runtime_pm_put(i915);
 }
 
+/**
+ * i915_gem_runtime_suspend() - Finish GEM suspend
+ * @dev_priv: i915 device private
+ *
+ * This function suspends GuC, removes userspace mappings for all GEM obejcts
+ * currently on userfault list and marks fences if any being used as lost.
+ *
+ * Return:	non-zero code on error
+ */
 int i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
 {
 	struct drm_i915_gem_object *obj, *on;
 	int i;
 
+	intel_guc_suspend(dev_priv);
+
 	/*
 	 * Only called during RPM suspend. All users of the userfault_list
 	 * must be holding an RPM wakeref to ensure that this can not
@@ -2069,6 +2080,14 @@ int i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
 	return 0;
 }
 
+/**
+ * i915_gem_runtime_resume() - Restore GEM state
+ * @dev_priv: i915 device private
+ *
+ * This function inits swizzling, restores fences and resumes GuC.
+ *
+ * Return:	non-zero code on error
+ */
 int i915_gem_runtime_resume(struct drm_i915_private *dev_priv)
 {
 	/*
@@ -2078,6 +2097,8 @@ int i915_gem_runtime_resume(struct drm_i915_private *dev_priv)
 	i915_gem_init_swizzling(dev_priv);
 	i915_gem_restore_fences(dev_priv);
 
+	intel_guc_resume(dev_priv);
+
 	return 0;
 }
 
@@ -4521,6 +4542,16 @@ void i915_gem_sanitize(struct drm_i915_private *i915)
 	}
 }
 
+/**
+ * i915_gem_suspend() - Suspend all GT activity.
+ * @dev_priv: i915 device private
+ *
+ * This function disables RPS, flushes all executing context ensuring
+ * GEM/GT/Engines idleness, cancels all work that needs GT access and suspends
+ * GuC. In the end currently, it also reset the GEM state and GPU HW.
+ *
+ * Return:	non-zero code on error
+ */
 int i915_gem_suspend(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = &dev_priv->drm;
@@ -4553,8 +4584,6 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	i915_gem_contexts_lost(dev_priv);
 	mutex_unlock(&dev->struct_mutex);
 
-	intel_guc_suspend(dev_priv);
-
 	cancel_delayed_work_sync(&dev_priv->gpu_error.hangcheck_work);
 	cancel_delayed_work_sync(&dev_priv->gt.retire_work);
 
@@ -4571,6 +4600,8 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	if (WARN_ON(!intel_engines_are_idle(dev_priv)))
 		i915_gem_set_wedged(dev_priv); /* no hope, discard everything */
 
+	intel_guc_suspend(dev_priv);
+
 	/*
 	 * Neither the BIOS, ourselves or any other kernel
 	 * expects the system to be in execlists mode on startup,
@@ -4601,6 +4632,15 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	return ret;
 }
 
+/**
+ * i915_gem_resume() - Resume GT activity.
+ * @dev_priv: i915 device private
+ *
+ * This function restores GTT mappings, restores fences and resets the
+ * context images and resumes GuC.
+ *
+ * Return:	non-zero code on error
+ */
 int i915_gem_resume(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = &dev_priv->drm;
@@ -4609,13 +4649,14 @@ int i915_gem_resume(struct drm_i915_private *dev_priv)
 
 	mutex_lock(&dev->struct_mutex);
 	i915_gem_restore_gtt_mappings(dev_priv);
+	i915_gem_restore_fences(dev_priv);
 
 	/* As we didn't flush the kernel context before suspend, we cannot
 	 * guarantee that the context image is complete. So let's just reset
 	 * it and start again.
 	 */
 	dev_priv->gt.resume(dev_priv);
-
+	intel_guc_resume(dev_priv);
 	mutex_unlock(&dev->struct_mutex);
 
 	return 0;
diff --git a/drivers/gpu/drm/i915/i915_suspend.c b/drivers/gpu/drm/i915/i915_suspend.c
index 5c86925a..8f3aa4d 100644
--- a/drivers/gpu/drm/i915/i915_suspend.c
+++ b/drivers/gpu/drm/i915/i915_suspend.c
@@ -108,8 +108,6 @@ int i915_restore_state(struct drm_i915_private *dev_priv)
 
 	mutex_lock(&dev_priv->drm.struct_mutex);
 
-	i915_gem_restore_fences(dev_priv);
-
 	if (IS_GEN4(dev_priv))
 		pci_write_config_word(pdev, GCDGMBUS,
 				      dev_priv->regfile.saveGCDGMBUS);
-- 
1.9.1

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