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SubjectRe: Do not suspend PCI devices twice [PATCH for testing]
Hi!

> PCI devices are suspendend twice; once using pm_send_all() and once
> because of driver model (when using ACPI). That's bad.
>
> If I kill pm_send_all() hook, they will not be suspended at all with
> APM, because APM does not call device_suspend(...,
> SUSPEND_SAVE_STATE). This patch fixes both of these.
>
> Ouch, no it does not. You should > drivers/pci/power.c. Its no longer
> needed.
>
> It compiles, and I'd like someone to test it ;-).

Here's the right patch. You no longer need to > power.c.

Pavel

--- /usr/src/tmp/linux/arch/i386/kernel/apm.c 2003-05-27 13:42:28.000000000 +0200
+++ /usr/src/linux/arch/i386/kernel/apm.c 2003-08-04 23:11:06.000000000 +0200
@@ -1185,19 +1185,23 @@
int err;
struct apm_user *as;

+ if (device_suspend(3, SUSPEND_NOTIFY))
+ if (vetoable)
+ goto veto;
+ if (device_suspend(3, SUSPEND_SAVE_STATE)) {
+ if (vetoable) {
+ device_resume(RESUME_RESTORE_STATE);
+ goto veto;
+ }
+ }
if (pm_send_all(PM_SUSPEND, (void *)3)) {
/* Vetoed */
if (vetoable) {
- if (apm_info.connection_version > 0x100)
- set_system_power_state(APM_STATE_REJECT);
- err = -EBUSY;
- ignore_sys_suspend = 0;
- printk(KERN_WARNING "apm: suspend was vetoed.\n");
- goto out;
+ device_resume(RESUME_RESTORE_STATE);
+ goto veto;
}
printk(KERN_CRIT "apm: suspend was vetoed, but suspending anyway.\n");
}
-
device_suspend(3, SUSPEND_POWER_DOWN);

/* serialize with the timer interrupt */
@@ -1234,7 +1238,17 @@
err = (err == APM_SUCCESS) ? 0 : -EIO;
device_resume(RESUME_POWER_ON);
pm_send_all(PM_RESUME, (void *)0);
+ device_resume(RESUME_RESTORE_STATE);
queue_event(APM_NORMAL_RESUME, NULL);
+
+ if (0) {
+ veto:
+ if (apm_info.connection_version > 0x100)
+ set_system_power_state(APM_STATE_REJECT);
+ err = -EBUSY;
+ ignore_sys_suspend = 0;
+ printk(KERN_WARNING "apm: suspend was vetoed.\n");
+ }
out:
spin_lock(&user_list_lock);
for (as = user_list; as != NULL; as = as->next) {
--- /usr/src/tmp/linux/drivers/pci/power.c 2003-06-15 22:42:54.000000000 +0200
+++ /usr/src/linux/drivers/pci/power.c 2003-08-04 23:25:37.000000000 +0200
@@ -1,159 +0,0 @@
-#include <linux/pci.h>
-#include <linux/pm.h>
-#include <linux/init.h>
-
-/*
- * PCI Power management..
- *
- * This needs to be done centralized, so that we power manage PCI
- * devices in the right order: we should not shut down PCI bridges
- * before we've shut down the devices behind them, and we should
- * not wake up devices before we've woken up the bridge to the
- * device.. Eh?
- *
- * We do not touch devices that don't have a driver that exports
- * a suspend/resume function. That is just too dangerous. If the default
- * PCI suspend/resume functions work for a device, the driver can
- * easily implement them (ie just have a suspend function that calls
- * the pci_set_power_state() function).
- */
-
-static int pci_pm_save_state_device(struct pci_dev *dev, u32 state)
-{
- int error = 0;
- if (dev) {
- struct pci_driver *driver = dev->driver;
- if (driver && driver->save_state)
- error = driver->save_state(dev,state);
- }
- return error;
-}
-
-static int pci_pm_suspend_device(struct pci_dev *dev, u32 state)
-{
- int error = 0;
- if (dev) {
- struct pci_driver *driver = dev->driver;
- if (driver && driver->suspend)
- error = driver->suspend(dev,state);
- }
- return error;
-}
-
-static int pci_pm_resume_device(struct pci_dev *dev)
-{
- int error = 0;
- if (dev) {
- struct pci_driver *driver = dev->driver;
- if (driver && driver->resume)
- error = driver->resume(dev);
- }
- return error;
-}
-
-static int pci_pm_save_state_bus(struct pci_bus *bus, u32 state)
-{
- struct list_head *list;
- int error = 0;
-
- list_for_each(list, &bus->children) {
- error = pci_pm_save_state_bus(pci_bus_b(list),state);
- if (error) return error;
- }
- list_for_each(list, &bus->devices) {
- error = pci_pm_save_state_device(pci_dev_b(list),state);
- if (error) return error;
- }
- return 0;
-}
-
-static int pci_pm_suspend_bus(struct pci_bus *bus, u32 state)
-{
- struct list_head *list;
-
- /* Walk the bus children list */
- list_for_each(list, &bus->children)
- pci_pm_suspend_bus(pci_bus_b(list),state);
-
- /* Walk the device children list */
- list_for_each(list, &bus->devices)
- pci_pm_suspend_device(pci_dev_b(list),state);
- return 0;
-}
-
-static int pci_pm_resume_bus(struct pci_bus *bus)
-{
- struct list_head *list;
-
- /* Walk the device children list */
- list_for_each(list, &bus->devices)
- pci_pm_resume_device(pci_dev_b(list));
-
- /* And then walk the bus children */
- list_for_each(list, &bus->children)
- pci_pm_resume_bus(pci_bus_b(list));
- return 0;
-}
-
-static int pci_pm_save_state(u32 state)
-{
- struct pci_bus *bus = NULL;
- int error = 0;
-
- while ((bus = pci_find_next_bus(bus)) != NULL) {
- error = pci_pm_save_state_bus(bus,state);
- if (!error)
- error = pci_pm_save_state_device(bus->self,state);
- }
- return error;
-}
-
-static int pci_pm_suspend(u32 state)
-{
- struct pci_bus *bus = NULL;
-
- while ((bus = pci_find_next_bus(bus)) != NULL) {
- pci_pm_suspend_bus(bus,state);
- pci_pm_suspend_device(bus->self,state);
- }
- return 0;
-}
-
-static int pci_pm_resume(void)
-{
- struct pci_bus *bus = NULL;
-
- while ((bus = pci_find_next_bus(bus)) != NULL) {
- pci_pm_resume_device(bus->self);
- pci_pm_resume_bus(bus);
- }
- return 0;
-}
-
-static int
-pci_pm_callback(struct pm_dev *pm_device, pm_request_t rqst, void *data)
-{
- int error = 0;
-
- switch (rqst) {
- case PM_SAVE_STATE:
- error = pci_pm_save_state((unsigned long)data);
- break;
- case PM_SUSPEND:
- error = pci_pm_suspend((unsigned long)data);
- break;
- case PM_RESUME:
- error = pci_pm_resume();
- break;
- default: break;
- }
- return error;
-}
-
-static int __init pci_pm_init(void)
-{
- pm_register(PM_PCI_DEV, 0, pci_pm_callback);
- return 0;
-}
-
-subsys_initcall(pci_pm_init);
--- /usr/src/tmp/linux/kernel/suspend.c 2003-08-04 23:28:06.000000000 +0200
+++ /usr/src/linux/kernel/suspend.c 2003-08-04 23:07:11.000000000 +0200
@@ -630,16 +630,20 @@
static void drivers_unsuspend(void)
{
device_resume(RESUME_RESTORE_STATE);
+ pm_send_all(PM_RESUME, (void *)0);
device_resume(RESUME_ENABLE);
}

/* Called from process context */
static int drivers_suspend(void)
{
- device_suspend(4, SUSPEND_NOTIFY);
- device_suspend(4, SUSPEND_SAVE_STATE);
- device_suspend(4, SUSPEND_DISABLE);
- if(!pm_suspend_state) {
+ if (device_suspend(4, SUSPEND_NOTIFY))
+ return -EIO;
+ if (device_suspend(4, SUSPEND_SAVE_STATE)) {
+ device_resume(RESUME_RESTORE_STATE);
+ return -EIO;
+ }
+ if (!pm_suspend_state) {
if(pm_send_all(PM_SUSPEND,(void *)3)) {
printk(KERN_WARNING "Problem while sending suspend event\n");
return(1);
@@ -647,6 +651,7 @@
pm_suspend_state=1;
} else
printk(KERN_WARNING "PM suspend state already raised\n");
+ device_suspend(4, SUSPEND_DISABLE);

return(0);
}
@@ -868,7 +873,7 @@
blk_run_queues();

/* Save state of all device drivers, and stop them. */
- if(drivers_suspend()==0)
+ if (drivers_suspend()==0)
/* If stopping device drivers worked, we proceed basically into
* suspend_save_image.
*
--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
-
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