if (!dev->pme_support)
return false;
+ /* PME-capable in principle, but not from the intended sleep state */
+ if (!pci_pme_capable(dev, pci_target_state(dev)))
+ return false;
+
while (bus->parent) {
struct pci_dev *bridge = bus->self;
* This function checks if it is possible to move the bridge to D3.
* Currently we only allow D3 for recent enough PCIe ports.
*/
-static bool pci_bridge_d3_possible(struct pci_dev *bridge)
+bool pci_bridge_d3_possible(struct pci_dev *bridge)
{
unsigned int year;
case PCI_EXP_TYPE_DOWNSTREAM:
if (pci_bridge_d3_disable)
return false;
+
+ /*
+ * Hotplug ports handled by firmware in System Management Mode
+ * may not be put into D3 by the OS (Thunderbolt on non-Macs).
+ */
+ if (bridge->is_hotplug_bridge && !pciehp_is_native(bridge))
+ return false;
+
if (pci_bridge_d3_force)
return true;
static int pci_dev_check_d3cold(struct pci_dev *dev, void *data)
{
bool *d3cold_ok = data;
- bool no_d3cold;
- /*
- * The device needs to be allowed to go D3cold and if it is wake
- * capable to do so from D3cold.
- */
- no_d3cold = dev->no_d3cold || !dev->d3cold_allowed ||
- (device_may_wakeup(&dev->dev) && !pci_pme_capable(dev, PCI_D3cold)) ||
- !pci_power_manageable(dev);
+ if (/* The device needs to be allowed to go D3cold ... */
+ dev->no_d3cold || !dev->d3cold_allowed ||
- *d3cold_ok = !no_d3cold;
+ /* ... and if it is wakeup capable to do so from D3cold. */
+ (device_may_wakeup(&dev->dev) &&
+ !pci_pme_capable(dev, PCI_D3cold)) ||
- return no_d3cold;
+ /* If it is a bridge it must be allowed to go to D3. */
+ !pci_power_manageable(dev) ||
+
+ /* Hotplug interrupts cannot be delivered if the link is down. */
+ dev->is_hotplug_bridge)
+
+ *d3cold_ok = false;
+
+ return !*d3cold_ok;
}
/*
* pci_bridge_d3_update - Update bridge D3 capabilities
* @dev: PCI device which is changed
- * @remove: Is the device being removed
*
* Update upstream bridge PM capabilities accordingly depending on if the
* device PM configuration was changed or the device is being removed. The
* change is also propagated upstream.
*/
-static void pci_bridge_d3_update(struct pci_dev *dev, bool remove)
+void pci_bridge_d3_update(struct pci_dev *dev)
{
+ bool remove = !device_is_registered(&dev->dev);
struct pci_dev *bridge;
bool d3cold_ok = true;
if (!bridge || !pci_bridge_d3_possible(bridge))
return;
- pci_dev_get(bridge);
/*
- * If the device is removed we do not care about its D3cold
- * capabilities.
+ * If D3 is currently allowed for the bridge, removing one of its
+ * children won't change that.
+ */
+ if (remove && bridge->bridge_d3)
+ return;
+
+ /*
+ * If D3 is currently allowed for the bridge and a child is added or
+ * changed, disallowance of D3 can only be caused by that child, so
+ * we only need to check that single device, not any of its siblings.
+ *
+ * If D3 is currently not allowed for the bridge, checking the device
+ * first may allow us to skip checking its siblings.
*/
if (!remove)
pci_dev_check_d3cold(dev, &d3cold_ok);
- if (d3cold_ok) {
- /*
- * We need to go through all children to find out if all of
- * them can still go to D3cold.
- */
+ /*
+ * If D3 is currently not allowed for the bridge, this may be caused
+ * either by the device being changed/removed or any of its siblings,
+ * so we need to go through all children to find out if one of them
+ * continues to block D3.
+ */
+ if (d3cold_ok && !bridge->bridge_d3)
pci_walk_bus(bridge->subordinate, pci_dev_check_d3cold,
&d3cold_ok);
- }
if (bridge->bridge_d3 != d3cold_ok) {
bridge->bridge_d3 = d3cold_ok;
/* Propagate change to upstream bridges */
- pci_bridge_d3_update(bridge, false);
+ pci_bridge_d3_update(bridge);
}
-
- pci_dev_put(bridge);
-}
-
-/**
- * pci_bridge_d3_device_changed - Update bridge D3 capabilities on change
- * @dev: PCI device that was changed
- *
- * If a device is added or its PM configuration, such as is it allowed to
- * enter D3cold, is changed this function updates upstream bridge PM
- * capabilities accordingly.
- */
-void pci_bridge_d3_device_changed(struct pci_dev *dev)
-{
- pci_bridge_d3_update(dev, false);
-}
-
-/**
- * pci_bridge_d3_device_removed - Update bridge D3 capabilities on remove
- * @dev: PCI device being removed
- *
- * Function updates upstream bridge PM capabilities based on other devices
- * still left on the bus.
- */
-void pci_bridge_d3_device_removed(struct pci_dev *dev)
-{
- pci_bridge_d3_update(dev, true);
}
/**
{
if (dev->no_d3cold) {
dev->no_d3cold = false;
- pci_bridge_d3_device_changed(dev);
+ pci_bridge_d3_update(dev);
}
}
EXPORT_SYMBOL_GPL(pci_d3cold_enable);
{
if (!dev->no_d3cold) {
dev->no_d3cold = true;
- pci_bridge_d3_device_changed(dev);
+ pci_bridge_d3_update(dev);
}
}
EXPORT_SYMBOL_GPL(pci_d3cold_disable);
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