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().
Testcase: igt/drv_suspend after igt/gem_tiled_swapping
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_drv.c | 43 +++++++++++++++++++++++++++------
1 file changed, 36 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 9c449b8d8eab..256642fb8315 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1553,6 +1553,25 @@ 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);
@@ -1575,13 +1594,6 @@ 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);
@@ -2081,6 +2093,22 @@ 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);
@@ -2731,6 +2759,7 @@ 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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