[Intel-gfx] [PATCH v10 1/9] drm/i915: Create GEM runtime resume helper and handle GEM suspend/resume errors

[Sagar Arun Kamble]

These changes are preparation to handle GuC suspend/resume. Prepared
helper i915_gem_runtime_resume to reinitialize suspended gem setup.
Returning status from i915_gem_runtime_suspend and i915_gem_resume.
This will be placeholder for handling any errors from uC suspend/resume
in upcoming patches. Restructured the suspend/resume routines w.r.t setup
creation and rollback order.
This also fixes issue of ordering of i915_gem_runtime_resume with
intel_runtime_pm_enable_interrupts.

v2: Fixed return from intel_runtime_resume. (Michał Winiarski)

v3: Not returning status from gem_runtime_resume. (Chris)

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Imre Deak <imre.deak at intel.com>
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Michał Winiarski <michal.winiarski at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c | 22 +++++++++++++---------
 drivers/gpu/drm/i915/i915_drv.h |  5 +++--
 drivers/gpu/drm/i915/i915_gem.c | 18 ++++++++++++++++--
 3 files changed, 32 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 7056bb2..d0a710d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1655,6 +1655,7 @@ static int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state)
 static int i915_drm_resume(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct pci_dev *pdev = dev_priv->drm.pdev;
 	int ret;
 
 	disable_rpm_wakeref_asserts(dev_priv);
@@ -1666,7 +1667,9 @@ static int i915_drm_resume(struct drm_device *dev)
 
 	intel_csr_ucode_resume(dev_priv);
 
-	i915_gem_resume(dev_priv);
+	ret = i915_gem_resume(dev_priv);
+	if (ret)
+		dev_err(&pdev->dev, "GEM resume failed\n");
 
 	i915_restore_state(dev_priv);
 	intel_pps_unlock_regs_wa(dev_priv);
@@ -2495,7 +2498,11 @@ static int intel_runtime_suspend(struct device *kdev)
 	 * We are safe here against re-faults, since the fault handler takes
 	 * an RPM reference.
 	 */
-	i915_gem_runtime_suspend(dev_priv);
+	ret = i915_gem_runtime_suspend(dev_priv);
+	if (ret) {
+		enable_rpm_wakeref_asserts(dev_priv);
+		return ret;
+	}
 
 	intel_guc_suspend(dev_priv);
 
@@ -2515,6 +2522,8 @@ static int intel_runtime_suspend(struct device *kdev)
 		DRM_ERROR("Runtime suspend failed, disabling it (%d)\n", ret);
 		intel_runtime_pm_enable_interrupts(dev_priv);
 
+		intel_guc_resume(dev_priv);
+		i915_gem_runtime_resume(dev_priv);
 		enable_rpm_wakeref_asserts(dev_priv);
 
 		return ret;
@@ -2596,13 +2605,6 @@ static int intel_runtime_resume(struct device *kdev)
 		ret = vlv_resume_prepare(dev_priv, true);
 	}
 
-	/*
-	 * No point of rolling back things in case of an error, as the best
-	 * we can do is to hope that things will still work (and disable RPM).
-	 */
-	i915_gem_init_swizzling(dev_priv);
-	i915_gem_restore_fences(dev_priv);
-
 	intel_runtime_pm_enable_interrupts(dev_priv);
 
 	/*
@@ -2615,6 +2617,8 @@ static int intel_runtime_resume(struct device *kdev)
 
 	intel_enable_ipc(dev_priv);
 
+	i915_gem_runtime_resume(dev_priv);
+
 	enable_rpm_wakeref_asserts(dev_priv);
 
 	if (ret)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b7cba89..42f3d89 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3479,7 +3479,8 @@ struct i915_vma * __must_check
 int i915_gem_object_unbind(struct drm_i915_gem_object *obj);
 void i915_gem_release_mmap(struct drm_i915_gem_object *obj);
 
-void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv);
+int i915_gem_runtime_suspend(struct drm_i915_private *dev_priv);
+void i915_gem_runtime_resume(struct drm_i915_private *dev_priv);
 
 static inline int __sg_page_count(const struct scatterlist *sg)
 {
@@ -3682,7 +3683,7 @@ void i915_gem_reset_engine(struct intel_engine_cs *engine,
 int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv,
 			   unsigned int flags);
 int __must_check i915_gem_suspend(struct drm_i915_private *dev_priv);
-void i915_gem_resume(struct drm_i915_private *dev_priv);
+int i915_gem_resume(struct drm_i915_private *dev_priv);
 int i915_gem_fault(struct vm_fault *vmf);
 int i915_gem_object_wait(struct drm_i915_gem_object *obj,
 			 unsigned int flags,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 73eeb6b..59a88f2 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2022,7 +2022,7 @@ int i915_gem_fault(struct vm_fault *vmf)
 	intel_runtime_pm_put(i915);
 }
 
-void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
+int i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
 {
 	struct drm_i915_gem_object *obj, *on;
 	int i;
@@ -2065,6 +2065,18 @@ void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
 		GEM_BUG_ON(!list_empty(&reg->vma->obj->userfault_link));
 		reg->dirty = true;
 	}
+
+	return 0;
+}
+
+void i915_gem_runtime_resume(struct drm_i915_private *dev_priv)
+{
+	/*
+	 * No point of rolling back things in case of an error, as the best
+	 * we can do is to hope that things will still work (and disable RPM).
+	 */
+	i915_gem_init_swizzling(dev_priv);
+	i915_gem_restore_fences(dev_priv);
 }
 
 static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
@@ -4587,7 +4599,7 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
 	return ret;
 }
 
-void i915_gem_resume(struct drm_i915_private *dev_priv)
+int i915_gem_resume(struct drm_i915_private *dev_priv)
 {
 	struct drm_device *dev = &dev_priv->drm;
 
@@ -4603,6 +4615,8 @@ void i915_gem_resume(struct drm_i915_private *dev_priv)
 	dev_priv->gt.resume(dev_priv);
 
 	mutex_unlock(&dev->struct_mutex);
+
+	return 0;
 }
 
 void i915_gem_init_swizzling(struct drm_i915_private *dev_priv)
-- 
1.9.1