1 files changed, 93 insertions, 42 deletions

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 11bd267fc137..7f47bb72bf30 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -680,17 +680,13 @@ static int pci_pm_prepare(struct device *dev)
 {
 	struct device_driver *drv = dev->driver;
 
-	/*
-	 * Devices having power.ignore_children set may still be necessary for
-	 * suspending their children in the next phase of device suspend.
-	 */
-	if (dev->power.ignore_children)
-		pm_runtime_resume(dev);
-
 	if (drv && drv->pm && drv->pm->prepare) {
 		int error = drv->pm->prepare(dev);
-		if (error)
+		if (error < 0)
 			return error;
+
+		if (!error && dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_PREPARE))
+			return 0;
 	}
 	return pci_dev_keep_suspended(to_pci_dev(dev));
 }
@@ -731,18 +727,25 @@ static int pci_pm_suspend(struct device *dev)
 
 	if (!pm) {
 		pci_pm_default_suspend(pci_dev);
-		goto Fixup;
+		return 0;
 	}
 
 	/*
-	 * PCI devices suspended at run time need to be resumed at this point,
-	 * because in general it is necessary to reconfigure them for system
-	 * suspend.  Namely, if the device is supposed to wake up the system
-	 * from the sleep state, we may need to reconfigure it for this purpose.
-	 * In turn, if the device is not supposed to wake up the system from the
-	 * sleep state, we'll have to prevent it from signaling wake-up.
+	 * PCI devices suspended at run time may need to be resumed at this
+	 * point, because in general it may be necessary to reconfigure them for
+	 * system suspend.  Namely, if the device is expected to wake up the
+	 * system from the sleep state, it may have to be reconfigured for this
+	 * purpose, or if the device is not expected to wake up the system from
+	 * the sleep state, it should be prevented from signaling wakeup events
+	 * going forward.
+	 *
+	 * Also if the driver of the device does not indicate that its system
+	 * suspend callbacks can cope with runtime-suspended devices, it is
+	 * better to resume the device from runtime suspend here.
 	 */
-	pm_runtime_resume(dev);
+	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
+	    !pci_dev_keep_suspended(pci_dev))
+		pm_runtime_resume(dev);
 
 	pci_dev->state_saved = false;
 	if (pm->suspend) {
@@ -762,17 +765,27 @@ static int pci_pm_suspend(struct device *dev)
 		}
 	}
 
- Fixup:
-	pci_fixup_device(pci_fixup_suspend, pci_dev);
-
 	return 0;
 }
 
+static int pci_pm_suspend_late(struct device *dev)
+{
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		return 0;
+
+	pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
+
+	return pm_generic_suspend_late(dev);
+}
+
 static int pci_pm_suspend_noirq(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		return 0;
+
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend_late(dev, PMSG_SUSPEND);
 
@@ -805,6 +818,9 @@ static int pci_pm_suspend_noirq(struct device *dev)
 			pci_prepare_to_sleep(pci_dev);
 	}
 
+	dev_dbg(dev, "PCI PM: Suspend power state: %s\n",
+		pci_power_name(pci_dev->current_state));
+
 	pci_pm_set_unknown_state(pci_dev);
 
 	/*
@@ -831,6 +847,14 @@ static int pci_pm_resume_noirq(struct device *dev)
 	struct device_driver *drv = dev->driver;
 	int error = 0;
 
+	/*
+	 * Devices with DPM_FLAG_SMART_SUSPEND may be left in runtime suspend
+	 * during system suspend, so update their runtime PM status to "active"
+	 * as they are going to be put into D0 shortly.
+	 */
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		pm_runtime_set_active(dev);
+
 	pci_pm_default_resume_early(pci_dev);
 
 	if (pci_has_legacy_pm_support(pci_dev))
@@ -873,6 +897,7 @@ static int pci_pm_resume(struct device *dev)
 #else /* !CONFIG_SUSPEND */
 
 #define pci_pm_suspend		NULL
+#define pci_pm_suspend_late	NULL
 #define pci_pm_suspend_noirq	NULL
 #define pci_pm_resume		NULL
 #define pci_pm_resume_noirq	NULL
@@ -907,7 +932,8 @@ static int pci_pm_freeze(struct device *dev)
 	 * devices should not be touched during freeze/thaw transitions,
 	 * however.
 	 */
-	pm_runtime_resume(dev);
+	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND))
+		pm_runtime_resume(dev);
 
 	pci_dev->state_saved = false;
 	if (pm->freeze) {
@@ -919,17 +945,25 @@ static int pci_pm_freeze(struct device *dev)
 			return error;
 	}
 
-	if (pcibios_pm_ops.freeze)
-		return pcibios_pm_ops.freeze(dev);
-
 	return 0;
 }
 
+static int pci_pm_freeze_late(struct device *dev)
+{
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		return 0;
+
+	return pm_generic_freeze_late(dev);;
+}
+
 static int pci_pm_freeze_noirq(struct device *dev)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);
 	struct device_driver *drv = dev->driver;
 
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		return 0;
+
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_suspend_late(dev, PMSG_FREEZE);
 
@@ -959,6 +993,16 @@ static int pci_pm_thaw_noirq(struct device *dev)
 	struct device_driver *drv = dev->driver;
 	int error = 0;
 
+	/*
+	 * If the device is in runtime suspend, the code below may not work
+	 * correctly with it, so skip that code and make the PM core skip all of
+	 * the subsequent "thaw" callbacks for the device.
+	 */
+	if (dev_pm_smart_suspend_and_suspended(dev)) {
+		dev->power.direct_complete = true;
+		return 0;
+	}
+
 	if (pcibios_pm_ops.thaw_noirq) {
 		error = pcibios_pm_ops.thaw_noirq(dev);
 		if (error)
@@ -983,12 +1027,6 @@ static int pci_pm_thaw(struct device *dev)
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int error = 0;
 
-	if (pcibios_pm_ops.thaw) {
-		error = pcibios_pm_ops.thaw(dev);
-		if (error)
-			return error;
-	}
-
 	if (pci_has_legacy_pm_support(pci_dev))
 		return pci_legacy_resume(dev);
 
@@ -1014,11 +1052,13 @@ static int pci_pm_poweroff(struct device *dev)
 
 	if (!pm) {
 		pci_pm_default_suspend(pci_dev);
-		goto Fixup;
+		return 0;
 	}
 
 	/* The reason to do that is the same as in pci_pm_suspend(). */
-	pm_runtime_resume(dev);
+	if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) ||
+	    !pci_dev_keep_suspended(pci_dev))
+		pm_runtime_resume(dev);
 
 	pci_dev->state_saved = false;
 	if (pm->poweroff) {
@@ -1030,13 +1070,17 @@ static int pci_pm_poweroff(struct device *dev)
 			return error;
 	}
 
- Fixup:
-	pci_fixup_device(pci_fixup_suspend, pci_dev);
+	return 0;
+}
 
-	if (pcibios_pm_ops.poweroff)
-		return pcibios_pm_ops.poweroff(dev);
+static int pci_pm_poweroff_late(struct device *dev)
+{
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		return 0;
 
-	return 0;
+	pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
+
+	return pm_generic_poweroff_late(dev);
 }
 
 static int pci_pm_poweroff_noirq(struct device *dev)
@@ -1044,6 +1088,9 @@ static int pci_pm_poweroff_noirq(struct device *dev)
 	struct pci_dev *pci_dev = to_pci_dev(dev);
 	struct device_driver *drv = dev->driver;
 
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		return 0;
+
 	if (pci_has_legacy_pm_support(to_pci_dev(dev)))
 		return pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
 
@@ -1085,6 +1132,10 @@ static int pci_pm_restore_noirq(struct device *dev)
 	struct device_driver *drv = dev->driver;
 	int error = 0;
 
+	/* This is analogous to the pci_pm_resume_noirq() case. */
+	if (dev_pm_smart_suspend_and_suspended(dev))
+		pm_runtime_set_active(dev);
+
 	if (pcibios_pm_ops.restore_noirq) {
 		error = pcibios_pm_ops.restore_noirq(dev);
 		if (error)
@@ -1108,12 +1159,6 @@ static int pci_pm_restore(struct device *dev)
 	const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
 	int error = 0;
 
-	if (pcibios_pm_ops.restore) {
-		error = pcibios_pm_ops.restore(dev);
-		if (error)
-			return error;
-	}
-
 	/*
 	 * This is necessary for the hibernation error path in which restore is
 	 * called without restoring the standard config registers of the device.
@@ -1139,10 +1184,12 @@ static int pci_pm_restore(struct device *dev)
 #else /* !CONFIG_HIBERNATE_CALLBACKS */
 
 #define pci_pm_freeze		NULL
+#define pci_pm_freeze_late	NULL
 #define pci_pm_freeze_noirq	NULL
 #define pci_pm_thaw		NULL
 #define pci_pm_thaw_noirq	NULL
 #define pci_pm_poweroff		NULL
+#define pci_pm_poweroff_late	NULL
 #define pci_pm_poweroff_noirq	NULL
 #define pci_pm_restore		NULL
 #define pci_pm_restore_noirq	NULL
@@ -1258,10 +1305,13 @@ static const struct dev_pm_ops pci_dev_pm_ops = {
 	.prepare = pci_pm_prepare,
 	.complete = pci_pm_complete,
 	.suspend = pci_pm_suspend,
+	.suspend_late = pci_pm_suspend_late,
 	.resume = pci_pm_resume,
 	.freeze = pci_pm_freeze,
+	.freeze_late = pci_pm_freeze_late,
 	.thaw = pci_pm_thaw,
 	.poweroff = pci_pm_poweroff,
+	.poweroff_late = pci_pm_poweroff_late,
 	.restore = pci_pm_restore,
 	.suspend_noirq = pci_pm_suspend_noirq,
 	.resume_noirq = pci_pm_resume_noirq,
@@ -1466,6 +1516,7 @@ struct bus_type pci_bus_type = {
 	.drv_groups	= pci_drv_groups,
 	.pm		= PCI_PM_OPS_PTR,
 	.num_vf		= pci_bus_num_vf,
+	.force_dma	= true,
 };
 EXPORT_SYMBOL(pci_bus_type);