PM / ACPI: Take device PM QoS flags into account

Make ACPI power management routines and PCI power management
routines depending on ACPI take device PM QoS flags into account
when deciding what power state to put the device into.

In particular, after this change acpi_pm_device_sleep_state() will
not return ACPI_STATE_D3_COLD as the deepest available low-power
state if PM_QOS_FLAG_NO_POWER_OFF is requested for the device and it
will not require remote wakeup to work for the device in the returned
low-power state if there is at least one PM QoS flags request for the
device, but PM_QOS_FLAG_REMOTE_WAKEUP is not requested for it.

Accordingly, acpi_pci_set_power_state() will refuse to put the
device into D3cold if PM_QOS_FLAG_NO_POWER_OFF is requested for it.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Huang Ying <ying.huang@intel.com>

2 files changed, 24 insertions, 5 deletions

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index fdcdbb652915..69134653909c 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -19,6 +19,7 @@
 #include <linux/acpi.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
 
 #include <asm/io.h>
 
@@ -711,6 +712,7 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 	struct acpi_device *adev;
 	char acpi_method[] = "_SxD";
 	unsigned long long d_min, d_max;
+	bool wakeup = false;
 
 	if (d_max_in < ACPI_STATE_D0 || d_max_in > ACPI_STATE_D3)
 		return -EINVAL;
@@ -718,6 +720,13 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 		printk(KERN_DEBUG "ACPI handle has no context!\n");
 		return -ENODEV;
 	}
+	if (d_max_in > ACPI_STATE_D3_HOT) {
+		enum pm_qos_flags_status stat;
+
+		stat = dev_pm_qos_flags(dev, PM_QOS_FLAG_NO_POWER_OFF);
+		if (stat == PM_QOS_FLAGS_ALL)
+			d_max_in = ACPI_STATE_D3_HOT;
+	}
 
 	acpi_method[2] = '0' + acpi_target_sleep_state;
 	/*
@@ -737,8 +746,14 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 	 * NOTE: We rely on acpi_evaluate_integer() not clobbering the integer
 	 * provided -- that's our fault recovery, we ignore retval.
 	 */
-	if (acpi_target_sleep_state > ACPI_STATE_S0)
+	if (acpi_target_sleep_state > ACPI_STATE_S0) {
 		acpi_evaluate_integer(handle, acpi_method, NULL, &d_min);
+		wakeup = device_may_wakeup(dev) && adev->wakeup.flags.valid
+			&& adev->wakeup.sleep_state >= acpi_target_sleep_state;
+	} else if (dev_pm_qos_flags(dev, PM_QOS_FLAG_REMOTE_WAKEUP) !=
+			PM_QOS_FLAGS_NONE) {
+		wakeup = adev->wakeup.flags.valid;
+	}
 
 	/*
 	 * If _PRW says we can wake up the system from the target sleep state,
@@ -747,9 +762,7 @@ int acpi_pm_device_sleep_state(struct device *dev, int *d_min_p, int d_max_in)
 	 * (ACPI 3.x), it should return the maximum (lowest power) D-state that
 	 * can wake the system.  _S0W may be valid, too.
 	 */
-	if (acpi_target_sleep_state == ACPI_STATE_S0 ||
-	    (device_may_wakeup(dev) && adev->wakeup.flags.valid &&
-	     adev->wakeup.sleep_state >= acpi_target_sleep_state)) {
+	if (wakeup) {
 		acpi_status status;
 
 		acpi_method[3] = 'W';
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index c5792d622dc4..63d6618a4804 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -17,6 +17,7 @@
 
 #include <linux/pci-acpi.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_qos.h>
 #include "pci.h"
 
 static DEFINE_MUTEX(pci_acpi_pm_notify_mtx);
@@ -257,11 +258,16 @@ static int acpi_pci_set_power_state(struct pci_dev *dev, pci_power_t state)
 		return -ENODEV;
 
 	switch (state) {
+	case PCI_D3cold:
+		if (dev_pm_qos_flags(&dev->dev, PM_QOS_FLAG_NO_POWER_OFF) ==
+				PM_QOS_FLAGS_ALL) {
+			error = -EBUSY;
+			break;
+		}
 	case PCI_D0:
 	case PCI_D1:
 	case PCI_D2:
 	case PCI_D3hot:
-	case PCI_D3cold:
 		error = acpi_bus_set_power(handle, state_conv[state]);
 	}