drm/i915: Only sanitize GEM from late suspend

During testing we encounter a conflict between SUSPEND_TEST_DEVICES and
disabling reset (gem_eio/suspend). This results in the device continuing
on without being reset, but since it has gone through HW sanitization to
account for the suspend/resume cycle, we have to assume the device has
been reset to its defaults. A simple way around this is to skip the
sanitize phase for SUSPEND_TEST_DEVICES by moving it to suspend-late.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180531082246.9763-4-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index fb39e40..fe92665 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -636,6 +636,8 @@ static const struct vga_switcheroo_client_ops i915_switcheroo_ops = {
 
 static void i915_gem_fini(struct drm_i915_private *dev_priv)
 {
+       i915_gem_suspend_late(dev_priv);
+
        /* Flush any outstanding unpin_work. */
        i915_gem_drain_workqueue(dev_priv);
 
@@ -1611,7 +1613,6 @@ static int i915_drm_suspend(struct drm_device *dev)
        opregion_target_state = suspend_to_idle(dev_priv) ? PCI_D1 : PCI_D3cold;
        intel_opregion_notify_adapter(dev_priv, opregion_target_state);
 
-       intel_uncore_suspend(dev_priv);
        intel_opregion_unregister(dev_priv);
 
        intel_fbdev_set_suspend(dev, FBINFO_STATE_SUSPENDED, true);
@@ -1633,7 +1634,10 @@ static int i915_drm_suspend_late(struct drm_device *dev, bool hibernation)
 
        disable_rpm_wakeref_asserts(dev_priv);
 
+       i915_gem_suspend_late(dev_priv);
+
        intel_display_set_init_power(dev_priv, false);
+       intel_uncore_suspend(dev_priv);
 
        /*
         * In case of firmware assisted context save/restore don't manually

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 32a65de..38157df 100644 (file)
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3169,6 +3169,7 @@ void i915_gem_cleanup_engines(struct drm_i915_private *dev_priv);
 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_suspend_late(struct drm_i915_private *dev_priv);
 void 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,

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 9b8fa18..f5c4ef0 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5055,6 +5055,17 @@ 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_runtime_pm_put(dev_priv);
+       return 0;
+
+err_unlock:
+       mutex_unlock(&dev->struct_mutex);
+       intel_runtime_pm_put(dev_priv);
+       return ret;
+}
+
+void i915_gem_suspend_late(struct drm_i915_private *i915)
+{
        /*
         * Neither the BIOS, ourselves or any other kernel
         * expects the system to be in execlists mode on startup,
@@ -5074,16 +5085,9 @@ int i915_gem_suspend(struct drm_i915_private *dev_priv)
         * machines is a good idea, we don't - just in case it leaves the
         * machine in an unusable condition.
         */
-       intel_uc_sanitize(dev_priv);
-       i915_gem_sanitize(dev_priv);
 
-       intel_runtime_pm_put(dev_priv);
-       return 0;
-
-err_unlock:
-       mutex_unlock(&dev->struct_mutex);
-       intel_runtime_pm_put(dev_priv);
-       return ret;
+       intel_uc_sanitize(i915);
+       i915_gem_sanitize(i915);
 }
 
 void i915_gem_resume(struct drm_i915_private *i915)