PM: Introduce PM_EVENT_HIBERNATE callback state
During the last step of hibernation in the "platform" mode (with the
help of ACPI) we use the suspend code, including the devices'
->suspend() methods, to prepare the system for entering the ACPI S4
system sleep state.
But at least for some devices the operations performed by the
->suspend() callback in that case must be different from its operations
during regular suspend.
For this reason, introduce the new PM event type PM_EVENT_HIBERNATE and
pass it to the device drivers' ->suspend() methods during the last phase
of hibernation, so that they can distinguish this case and handle it as
appropriate. Modify the drivers that handle PM_EVENT_SUSPEND in a
special way and need to handle PM_EVENT_HIBERNATE in the same way.
These changes are necessary to fix a hibernation regression related
to the i915 driver (ref. http://lkml.org/lkml/2008/2/22/488).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt
index c53d263..461e4f1 100644
--- a/Documentation/power/devices.txt
+++ b/Documentation/power/devices.txt
@@ -310,9 +310,12 @@
PM_EVENT_SUSPEND -- quiesce the driver and put hardware into a low-power
state. When used with system sleep states like "suspend-to-RAM" or
"standby", the upcoming resume() call will often be able to rely on
- state kept in hardware, or issue system wakeup events. When used
- instead with suspend-to-disk, few devices support this capability;
- most are completely powered off.
+ state kept in hardware, or issue system wakeup events.
+
+ PM_EVENT_HIBERNATE -- Put hardware into a low-power state and enable wakeup
+ events as appropriate. It is only used with hibernation
+ (suspend-to-disk) and few devices are able to wake up the system from
+ this state; most are completely powered off.
PM_EVENT_FREEZE -- quiesce the driver, but don't necessarily change into
any low power mode. A system snapshot is about to be taken, often
@@ -329,8 +332,8 @@
wakeup events nor DMA are allowed.
To enter "standby" (ACPI S1) or "Suspend to RAM" (STR, ACPI S3) states, or
-the similarly named APM states, only PM_EVENT_SUSPEND is used; for "Suspend
-to Disk" (STD, hibernate, ACPI S4), all of those event codes are used.
+the similarly named APM states, only PM_EVENT_SUSPEND is used; the other event
+codes are used for hibernation ("Suspend to Disk", STD, ACPI S4).
There's also PM_EVENT_ON, a value which never appears as a suspend event
but is sometimes used to record the "not suspended" device state.
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 3c06e45..6dd12f7 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1932,7 +1932,7 @@
void __iomem *mmio = host->iomap[AHCI_PCI_BAR];
u32 ctl;
- if (mesg.event == PM_EVENT_SUSPEND) {
+ if (mesg.event & PM_EVENT_SLEEP) {
/* AHCI spec rev1.1 section 8.3.3:
* Software must disable interrupts prior to requesting a
* transition of the HBA to D3 state.
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 752e7d2..fae8404 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -1339,7 +1339,7 @@
* cycles and power trying to do something to the sleeping
* beauty.
*/
- if (piix_broken_suspend() && mesg.event == PM_EVENT_SUSPEND) {
+ if (piix_broken_suspend() && (mesg.event & PM_EVENT_SLEEP)) {
pci_save_state(pdev);
/* mark its power state as "unknown", since we don't
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 60d1bb5..4cf8662 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -7368,7 +7368,7 @@
pci_save_state(pdev);
pci_disable_device(pdev);
- if (mesg.event == PM_EVENT_SUSPEND)
+ if (mesg.event & PM_EVENT_SLEEP)
pci_set_power_state(pdev, PCI_D3hot);
}
diff --git a/drivers/ide/ppc/pmac.c b/drivers/ide/ppc/pmac.c
index 12ac3bf..78c9eeb 100644
--- a/drivers/ide/ppc/pmac.c
+++ b/drivers/ide/ppc/pmac.c
@@ -1254,7 +1254,7 @@
int rc = 0;
if (mesg.event != mdev->ofdev.dev.power.power_state.event
- && mesg.event == PM_EVENT_SUSPEND) {
+ && (mesg.event & PM_EVENT_SLEEP)) {
rc = pmac_ide_do_suspend(hwif);
if (rc == 0)
mdev->ofdev.dev.power.power_state = mesg;
@@ -1364,7 +1364,7 @@
int rc = 0;
if (mesg.event != pdev->dev.power.power_state.event
- && mesg.event == PM_EVENT_SUSPEND) {
+ && (mesg.event & PM_EVENT_SLEEP)) {
rc = pmac_ide_do_suspend(hwif);
if (rc == 0)
pdev->dev.power.power_state = mesg;
diff --git a/drivers/macintosh/mediabay.c b/drivers/macintosh/mediabay.c
index 51a1128..bd8a1d1 100644
--- a/drivers/macintosh/mediabay.c
+++ b/drivers/macintosh/mediabay.c
@@ -698,7 +698,8 @@
{
struct media_bay_info *bay = macio_get_drvdata(mdev);
- if (state.event != mdev->ofdev.dev.power.power_state.event && state.event == PM_EVENT_SUSPEND) {
+ if (state.event != mdev->ofdev.dev.power.power_state.event
+ && (state.event & PM_EVENT_SLEEP)) {
down(&bay->lock);
bay->sleeping = 1;
set_mb_power(bay, 0);
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index ae3df46..183fdda 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -554,6 +554,7 @@
case PM_EVENT_PRETHAW:
/* REVISIT both freeze and pre-thaw "should" use D0 */
case PM_EVENT_SUSPEND:
+ case PM_EVENT_HIBERNATE:
return PCI_D3hot;
default:
printk("Unrecognized suspend event %d\n", state.event);
diff --git a/drivers/scsi/aic7xxx/aic79xx_osm_pci.c b/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
index 4150c8a..dfaaae5 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm_pci.c
@@ -89,7 +89,7 @@
pci_save_state(pdev);
pci_disable_device(pdev);
- if (mesg.event == PM_EVENT_SUSPEND)
+ if (mesg.event & PM_EVENT_SLEEP)
pci_set_power_state(pdev, PCI_D3hot);
return rc;
diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
index dd6e21d..3d3eaef 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm_pci.c
@@ -134,7 +134,7 @@
pci_save_state(pdev);
pci_disable_device(pdev);
- if (mesg.event == PM_EVENT_SUSPEND)
+ if (mesg.event & PM_EVENT_SLEEP)
pci_set_power_state(pdev, PCI_D3hot);
return rc;
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index 651d09b..fd63b06 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -1759,6 +1759,7 @@
switch (mesg.event) {
case PM_EVENT_SUSPEND:
+ case PM_EVENT_HIBERNATE:
case PM_EVENT_FREEZE:
break;
default:
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 37df8bb..7aee64d 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1835,8 +1835,7 @@
goto done;
}
- if (mesg.event == PM_EVENT_SUSPEND &&
- sdkp->device->manage_start_stop) {
+ if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
ret = sd_start_stop_device(sdkp, 0);
}
diff --git a/drivers/usb/host/sl811-hcd.c b/drivers/usb/host/sl811-hcd.c
index ba370c5..59be276 100644
--- a/drivers/usb/host/sl811-hcd.c
+++ b/drivers/usb/host/sl811-hcd.c
@@ -1766,6 +1766,7 @@
retval = sl811h_bus_suspend(hcd);
break;
case PM_EVENT_SUSPEND:
+ case PM_EVENT_HIBERNATE:
case PM_EVENT_PRETHAW: /* explicitly discard hw state */
port_power(sl811, 0);
break;
diff --git a/drivers/usb/host/u132-hcd.c b/drivers/usb/host/u132-hcd.c
index ac283b0..6fca069 100644
--- a/drivers/usb/host/u132-hcd.c
+++ b/drivers/usb/host/u132-hcd.c
@@ -3214,14 +3214,19 @@
return -ESHUTDOWN;
} else {
int retval = 0;
- if (state.event == PM_EVENT_FREEZE) {
+
+ switch (state.event) {
+ case PM_EVENT_FREEZE:
retval = u132_bus_suspend(hcd);
- } else if (state.event == PM_EVENT_SUSPEND) {
+ break;
+ case PM_EVENT_SUSPEND:
+ case PM_EVENT_HIBERNATE:
int ports = MAX_U132_PORTS;
while (ports-- > 0) {
port_power(u132, ports, 0);
}
- }
+ break;
+ }
if (retval == 0)
pdev->dev.power.power_state = state;
return retval;
diff --git a/drivers/video/chipsfb.c b/drivers/video/chipsfb.c
index 6796ba6..777389c 100644
--- a/drivers/video/chipsfb.c
+++ b/drivers/video/chipsfb.c
@@ -459,7 +459,7 @@
if (state.event == pdev->dev.power.power_state.event)
return 0;
- if (state.event != PM_EVENT_SUSPEND)
+ if (!(state.event & PM_EVENT_SLEEP))
goto done;
acquire_console_sem();
diff --git a/drivers/video/nvidia/nvidia.c b/drivers/video/nvidia/nvidia.c
index 74517b1..596652d 100644
--- a/drivers/video/nvidia/nvidia.c
+++ b/drivers/video/nvidia/nvidia.c
@@ -1066,7 +1066,7 @@
acquire_console_sem();
par->pm_state = mesg.event;
- if (mesg.event == PM_EVENT_SUSPEND) {
+ if (mesg.event & PM_EVENT_SLEEP) {
fb_set_suspend(info, 1);
nvidiafb_blank(FB_BLANK_POWERDOWN, info);
nvidia_write_regs(par, &par->SavedReg);
diff --git a/include/linux/pm.h b/include/linux/pm.h
index eccf59e..015b735 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -143,6 +143,9 @@
* the upcoming system state (such as PCI_D3hot), and enable
* wakeup events as appropriate.
*
+ * HIBERNATE Enter a low power device state appropriate for the hibernation
+ * state (eg. ACPI S4) and enable wakeup events as appropriate.
+ *
* FREEZE Quiesce operations so that a consistent image can be saved;
* but do NOT otherwise enter a low power device state, and do
* NOT emit system wakeup events.
@@ -166,11 +169,15 @@
#define PM_EVENT_ON 0
#define PM_EVENT_FREEZE 1
#define PM_EVENT_SUSPEND 2
-#define PM_EVENT_PRETHAW 3
+#define PM_EVENT_HIBERNATE 4
+#define PM_EVENT_PRETHAW 8
+
+#define PM_EVENT_SLEEP (PM_EVENT_SUSPEND | PM_EVENT_HIBERNATE)
#define PMSG_FREEZE ((struct pm_message){ .event = PM_EVENT_FREEZE, })
#define PMSG_PRETHAW ((struct pm_message){ .event = PM_EVENT_PRETHAW, })
#define PMSG_SUSPEND ((struct pm_message){ .event = PM_EVENT_SUSPEND, })
+#define PMSG_HIBERNATE ((struct pm_message){ .event = PM_EVENT_HIBERNATE, })
#define PMSG_ON ((struct pm_message){ .event = PM_EVENT_ON, })
struct dev_pm_info {
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 859a8e5..14a656c 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -391,7 +391,7 @@
goto Close;
suspend_console();
- error = device_suspend(PMSG_SUSPEND);
+ error = device_suspend(PMSG_HIBERNATE);
if (error)
goto Resume_console;
@@ -404,7 +404,7 @@
goto Finish;
local_irq_disable();
- error = device_power_down(PMSG_SUSPEND);
+ error = device_power_down(PMSG_HIBERNATE);
if (!error) {
hibernation_ops->enter();
/* We should never get here */
diff --git a/net/rfkill/rfkill.c b/net/rfkill/rfkill.c
index 1a47f5d..140a0a8 100644
--- a/net/rfkill/rfkill.c
+++ b/net/rfkill/rfkill.c
@@ -232,7 +232,7 @@
struct rfkill *rfkill = to_rfkill(dev);
if (dev->power.power_state.event != state.event) {
- if (state.event == PM_EVENT_SUSPEND) {
+ if (state.event & PM_EVENT_SLEEP) {
mutex_lock(&rfkill->mutex);
if (rfkill->state == RFKILL_STATE_ON)