[PATCH 0/2] PCI / PM: Updates related to wakeup events

[PATCH 0/2] PCI / PM: Updates related to wakeup events

[Rafael J. Wysocki]

Hi,

The following two patches modify the PCI power management core's handling
of wakeup events:

[1/2] - Replace pci_wakeup_event() with a static inline function.

[2/2] - Report PCI wakeup events before resuming the involved devices.

The patches have been tested on multiple machines.

Please apply.

Thanks,
Rafael

[PATCH 1/2] PCI / PM: Use pm_wakeup_event() directly for reporting wakeup events

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.pl>

After recent changes related to wakeup events pm_wakeup_event()
automatically checks if the given device is configured to signal
wakeup, so pci_wakeup_event() may be a static inline function
calling pm_wakeup_event() directly.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 drivers/pci/pci.c   |   16 ----------------
 drivers/pci/pci.h   |    6 ++++++
 include/linux/pci.h |    1 -
 3 files changed, 6 insertions(+), 17 deletions(-)

Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -1300,22 +1300,6 @@ bool pci_check_pme_status(struct pci_dev
 	return ret;
 }
 
-/*
- * Time to wait before the system can be put into a sleep state after reporting
- * a wakeup event signaled by a PCI device.
- */
-#define PCI_WAKEUP_COOLDOWN	100
-
-/**
- * pci_wakeup_event - Report a wakeup event related to a given PCI device.
- * @dev: Device to report the wakeup event for.
- */
-void pci_wakeup_event(struct pci_dev *dev)
-{
-	if (device_may_wakeup(&dev->dev))
-		pm_wakeup_event(&dev->dev, PCI_WAKEUP_COOLDOWN);
-}
-
 /**
  * pci_pme_wakeup - Wake up a PCI device if its PME Status bit is set.
  * @dev: Device to handle.
Index: linux-2.6/drivers/pci/pci.h
===================================================================
--- linux-2.6.orig/drivers/pci/pci.h
+++ linux-2.6/drivers/pci/pci.h
@@ -74,6 +74,12 @@ extern void pci_pm_init(struct pci_dev *
 extern void platform_pci_wakeup_init(struct pci_dev *dev);
 extern void pci_allocate_cap_save_buffers(struct pci_dev *dev);
 
+static inline void pci_wakeup_event(struct pci_dev *dev)
+{
+	/* Wait 100 ms before the system can be put into a sleep state. */
+	pm_wakeup_event(&dev->dev, 100);
+}
+
 static inline bool pci_is_bridge(struct pci_dev *pci_dev)
 {
 	return !!(pci_dev->subordinate);
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -820,7 +820,6 @@ int pci_prepare_to_sleep(struct pci_dev 
 int pci_back_from_sleep(struct pci_dev *dev);
 bool pci_dev_run_wake(struct pci_dev *dev);
 bool pci_check_pme_status(struct pci_dev *dev);
-void pci_wakeup_event(struct pci_dev *dev);
 void pci_pme_wakeup_bus(struct pci_bus *bus);
 
 static inline int pci_enable_wake(struct pci_dev *dev, pci_power_t state,

[PATCH 2/2] PCI / PM: Report wakeup events before resuming devices

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.pl>

Make wakeup events be reported by the PCI subsystem before attempting
to resume devices or queuing up runtime resume requests for them,
because wakeup events should be reported as soon as they have been
detected.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 drivers/pci/pci-acpi.c |    2 +-
 drivers/pci/pci.c      |    2 +-
 drivers/pci/pcie/pme.c |    4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

Index: linux-2.6/drivers/pci/pci-acpi.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci-acpi.c
+++ linux-2.6/drivers/pci/pci-acpi.c
@@ -46,9 +46,9 @@ static void pci_acpi_wake_dev(acpi_handl
 	struct pci_dev *pci_dev = context;
 
 	if (event == ACPI_NOTIFY_DEVICE_WAKE && pci_dev) {
+		pci_wakeup_event(pci_dev);
 		pci_check_pme_status(pci_dev);
 		pm_runtime_resume(&pci_dev->dev);
-		pci_wakeup_event(pci_dev);
 		if (pci_dev->subordinate)
 			pci_pme_wakeup_bus(pci_dev->subordinate);
 	}
Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -1311,8 +1311,8 @@ bool pci_check_pme_status(struct pci_dev
 static int pci_pme_wakeup(struct pci_dev *dev, void *ign)
 {
 	if (pci_check_pme_status(dev)) {
-		pm_request_resume(&dev->dev);
 		pci_wakeup_event(dev);
+		pm_request_resume(&dev->dev);
 	}
 	return 0;
 }
Index: linux-2.6/drivers/pci/pcie/pme.c
===================================================================
--- linux-2.6.orig/drivers/pci/pcie/pme.c
+++ linux-2.6/drivers/pci/pcie/pme.c
@@ -103,8 +103,8 @@ static bool pcie_pme_walk_bus(struct pci
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		/* Skip PCIe devices in case we started from a root port. */
 		if (!pci_is_pcie(dev) && pci_check_pme_status(dev)) {
-			pm_request_resume(&dev->dev);
 			pci_wakeup_event(dev);
+			pm_request_resume(&dev->dev);
 			ret = true;
 		}
 
@@ -206,8 +206,8 @@ static void pcie_pme_handle_request(stru
 		/* The device is there, but we have to check its PME status. */
 		found = pci_check_pme_status(dev);
 		if (found) {
-			pm_request_resume(&dev->dev);
 			pci_wakeup_event(dev);
+			pm_request_resume(&dev->dev);
 		}
 		pci_dev_put(dev);
 	} else if (devfn) {

Re: [PATCH 1/2] PCI / PM: Use pm_wakeup_event() directly for reporting wakeup events

[Jesse Barnes]

On Wed, 29 Dec 2010 13:21:23 +0100
"Rafael J. Wysocki" <rjw@sisk.pl> wrote:

> From: Rafael J. Wysocki <rjw@sisk.pl>
> 
> After recent changes related to wakeup events pm_wakeup_event()
> automatically checks if the given device is configured to signal
> wakeup, so pci_wakeup_event() may be a static inline function
> calling pm_wakeup_event() directly.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> ---

Applied these two, thanks.

-- 
Jesse Barnes, Intel Open Source Technology Center