[PATCH] drm/i915: Prepare GEM for suspend earlier

* [PATCH] drm/i915: Prepare GEM for suspend earlier
@ 2018-05-22 15:49 Chris Wilson
  2018-05-22 16:31 ` ✗ Fi.CI.BAT: failure for drm/i915: Prepare GEM for suspend earlier (rev3) Patchwork
  2018-05-22 16:55 ` [PATCH] drm/i915: Prepare GEM for suspend earlier Chris Wilson
  0 siblings, 2 replies; 11+ messages in thread
From: Chris Wilson @ 2018-05-22 15:49 UTC (permalink / raw)
  To: intel-gfx

In order to prepare the GPU for sleeping, we may want to submit commands
to it. This is a complicated process that may even require some swapping
in from shmemfs, if the GPU was in the wrong state. As such, we need to
do this preparation step synchronously before the rest of the system has
started to turn off (e.g. swapin fails if scsi is suspended).
Fortunately, we are provided with a such a hook, pm_ops.prepare().

v2: Compile cleanup
v3: Add manual calls to i915_drm_prepare() before i915_drm_suspend().

Testcase: igt/drv_suspend after igt/gem_tiled_swapping
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/i915_drv.c | 55 +++++++++++++++++++++++++++------
 1 file changed, 45 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 9c449b8d8eab..8642f9a1aff2 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1553,12 +1553,30 @@ static bool suspend_to_idle(struct drm_i915_private *dev_priv)
 	return false;
 }
 
+static int i915_drm_prepare(struct drm_device *dev)
+{
+	struct drm_i915_private *i915 = to_i915(dev);
+	int err;
+
+	disable_rpm_wakeref_asserts(i915);
+
+	err = i915_gem_suspend(i915);
+	if (err) {
+		dev_err(&i915->drm.pdev->dev,
+			"GEM idle failed, suspend/resume might fail\n");
+		goto out;
+	}
+out:
+	enable_rpm_wakeref_asserts(i915);
+
+	return err;
+}
+
 static int i915_drm_suspend(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct pci_dev *pdev = dev_priv->drm.pdev;
 	pci_power_t opregion_target_state;
-	int error;
 
 	/* ignore lid events during suspend */
 	mutex_lock(&dev_priv->modeset_restore_lock);
@@ -1575,13 +1593,6 @@ static int i915_drm_suspend(struct drm_device *dev)
 
 	pci_save_state(pdev);
 
-	error = i915_gem_suspend(dev_priv);
-	if (error) {
-		dev_err(&pdev->dev,
-			"GEM idle failed, resume might fail\n");
-		goto out;
-	}
-
 	intel_display_suspend(dev);
 
 	intel_dp_mst_suspend(dev);
@@ -1609,10 +1620,9 @@ static int i915_drm_suspend(struct drm_device *dev)
 
 	intel_csr_ucode_suspend(dev_priv);
 
-out:
 	enable_rpm_wakeref_asserts(dev_priv);
 
-	return error;
+	return 0;
 }
 
 static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
@@ -1695,6 +1705,10 @@ static int i915_suspend_switcheroo(struct drm_device *dev, pm_message_t state)
 	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
 		return 0;
 
+	error = i915_drm_prepare(dev);
+	if (error)
+		return error;
+
 	error = i915_drm_suspend(dev);
 	if (error)
 		return error;
@@ -2081,6 +2095,22 @@ int i915_reset_engine(struct intel_engine_cs *engine, const char *msg)
 	return ret;
 }
 
+static int i915_pm_prepare(struct device *kdev)
+{
+	struct pci_dev *pdev = to_pci_dev(kdev);
+	struct drm_device *dev = pci_get_drvdata(pdev);
+
+	if (!dev) {
+		dev_err(kdev, "DRM not initialized, aborting suspend.\n");
+		return -ENODEV;
+	}
+
+	if (dev->switch_power_state == DRM_SWITCH_POWER_OFF)
+		return 0;
+
+	return i915_drm_prepare(dev);
+}
+
 static int i915_pm_suspend(struct device *kdev)
 {
 	struct pci_dev *pdev = to_pci_dev(kdev);
@@ -2153,6 +2183,10 @@ static int i915_pm_freeze(struct device *kdev)
 	int ret;
 
 	if (dev->switch_power_state != DRM_SWITCH_POWER_OFF) {
+		ret = i915_drm_prepare(dev);
+		if (ret)
+			return ret;
+
 		ret = i915_drm_suspend(dev);
 		if (ret)
 			return ret;
@@ -2731,6 +2765,7 @@ const struct dev_pm_ops i915_pm_ops = {
 	 * S0ix (via system suspend) and S3 event handlers [PMSG_SUSPEND,
 	 * PMSG_RESUME]
 	 */
+	.prepare = i915_pm_prepare,
 	.suspend = i915_pm_suspend,
 	.suspend_late = i915_pm_suspend_late,
 	.resume_early = i915_pm_resume_early,
-- 
2.17.0

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