PCI: implement new suspend/resume callbacks

Implement new suspend and hibernation callbacks for the PCI bus type.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 346 insertions, 46 deletions

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 677fd9d6db12..8eb8a3091dc7 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -274,7 +274,57 @@ static int pci_device_remove(struct device * dev)
         return 0;
 }
 
-static int pci_device_suspend(struct device * dev, pm_message_t state)
+static void pci_device_shutdown(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = pci_dev->driver;
+
+        if (drv && drv->shutdown)
+                drv->shutdown(pci_dev);
+        pci_msi_shutdown(pci_dev);
+        pci_msix_shutdown(pci_dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+
+/*
+ * Default "suspend" method for devices that have no driver provided suspend,
+ * or not even a driver at all.
+ */
+static void pci_default_pm_suspend(struct pci_dev *pci_dev)
+{
+        pci_save_state(pci_dev);
+        /*
+         * mark its power state as "unknown", since we don't know if
+         * e.g. the BIOS will change its device state when we suspend.
+         */
+        if (pci_dev->current_state == PCI_D0)
+                pci_dev->current_state = PCI_UNKNOWN;
+}
+
+/*
+ * Default "resume" method for devices that have no driver provided resume,
+ * or not even a driver at all.
+ */
+static int pci_default_pm_resume(struct pci_dev *pci_dev)
+{
+        int retval = 0;
+
+        /* restore the PCI config space */
+        pci_restore_state(pci_dev);
+        /* if the device was enabled before suspend, reenable */
+        retval = pci_reenable_device(pci_dev);
+        /*
+         * if the device was busmaster before the suspend, make it busmaster
+         * again
+         */
+        if (pci_dev->is_busmaster)
+                pci_set_master(pci_dev);
+
+        return retval;
+}
+
+static int pci_legacy_suspend(struct device *dev, pm_message_t state)
 {
         struct pci_dev * pci_dev = to_pci_dev(dev);
         struct pci_driver * drv = pci_dev->driver;
@@ -284,21 +334,12 @@ static int pci_device_suspend(struct device * dev, pm_message_t state)
                 i = drv->suspend(pci_dev, state);
                 suspend_report_result(drv->suspend, i);
         } else {
-                pci_save_state(pci_dev);
-                /*
-                 * mark its power state as "unknown", since we don't know if
-                 * e.g. the BIOS will change its device state when we suspend.
-                 */
-                if (pci_dev->current_state == PCI_D0)
-                        pci_dev->current_state = PCI_UNKNOWN;
+                pci_default_pm_suspend(pci_dev);
         }
-
-        pci_fixup_device(pci_fixup_suspend, pci_dev);
-
         return i;
 }
 
-static int pci_device_suspend_late(struct device * dev, pm_message_t state)
+static int pci_legacy_suspend_late(struct device *dev, pm_message_t state)
 {
         struct pci_dev * pci_dev = to_pci_dev(dev);
         struct pci_driver * drv = pci_dev->driver;
@@ -311,26 +352,7 @@ static int pci_device_suspend_late(struct device * dev, pm_message_t state)
         return i;
 }
 
-/*
- * Default resume method for devices that have no driver provided resume,
- * or not even a driver at all.
- */
-static int pci_default_resume(struct pci_dev *pci_dev)
-{
-        int retval = 0;
-
-        /* restore the PCI config space */
-        pci_restore_state(pci_dev);
-        /* if the device was enabled before suspend, reenable */
-        retval = pci_reenable_device(pci_dev);
-        /* if the device was busmaster before the suspend, make it busmaster again */
-        if (pci_dev->is_busmaster)
-                pci_set_master(pci_dev);
-
-        return retval;
-}
-
-static int pci_device_resume(struct device * dev)
+static int pci_legacy_resume(struct device *dev)
 {
         int error;
         struct pci_dev * pci_dev = to_pci_dev(dev);
@@ -339,35 +361,313 @@ static int pci_device_resume(struct device * dev)
         if (drv && drv->resume)
                 error = drv->resume(pci_dev);
         else
-                error = pci_default_resume(pci_dev);
-        pci_fixup_device(pci_fixup_resume, pci_dev);
+                error = pci_default_pm_resume(pci_dev);
         return error;
 }
 
-static int pci_device_resume_early(struct device * dev)
+static int pci_legacy_resume_early(struct device *dev)
 {
         int error = 0;
         struct pci_dev * pci_dev = to_pci_dev(dev);
         struct pci_driver * drv = pci_dev->driver;
 
-        pci_fixup_device(pci_fixup_resume_early, pci_dev);
-
         if (drv && drv->resume_early)
                 error = drv->resume_early(pci_dev);
         return error;
 }
 
-static void pci_device_shutdown(struct device *dev)
+static int pci_pm_prepare(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm && drv->pm->prepare)
+                error = drv->pm->prepare(dev);
+
+        return error;
+}
+
+static void pci_pm_complete(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+
+        if (drv && drv->pm && drv->pm->complete)
+                drv->pm->complete(dev);
+}
+
+#ifdef CONFIG_SUSPEND
+
+static int pci_pm_suspend(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct device_driver *drv = dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm) {
+                if (drv->pm->suspend) {
+                        error = drv->pm->suspend(dev);
+                        suspend_report_result(drv->pm->suspend, error);
+                } else {
+                        pci_default_pm_suspend(pci_dev);
+                }
+        } else {
+                error = pci_legacy_suspend(dev, PMSG_SUSPEND);
+        }
+        pci_fixup_device(pci_fixup_suspend, pci_dev);
+
+        return error;
+}
+
+static int pci_pm_suspend_noirq(struct device *dev)
 {
         struct pci_dev *pci_dev = to_pci_dev(dev);
         struct pci_driver *drv = pci_dev->driver;
+        int error = 0;
 
-        if (drv && drv->shutdown)
-                drv->shutdown(pci_dev);
-        pci_msi_shutdown(pci_dev);
-        pci_msix_shutdown(pci_dev);
+        if (drv && drv->pm) {
+                if (drv->pm->suspend_noirq) {
+                        error = drv->pm->suspend_noirq(dev);
+                        suspend_report_result(drv->pm->suspend_noirq, error);
+                }
+        } else {
+                error = pci_legacy_suspend_late(dev, PMSG_SUSPEND);
+        }
+
+        return error;
+}
+
+static int pci_pm_resume(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct device_driver *drv = dev->driver;
+        int error;
+
+        pci_fixup_device(pci_fixup_resume, pci_dev);
+
+        if (drv && drv->pm) {
+                error = drv->pm->resume ? drv->pm->resume(dev) :
+                        pci_default_pm_resume(pci_dev);
+        } else {
+                error = pci_legacy_resume(dev);
+        }
+
+        return error;
+}
+
+static int pci_pm_resume_noirq(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = pci_dev->driver;
+        int error = 0;
+
+        pci_fixup_device(pci_fixup_resume_early, pci_dev);
+
+        if (drv && drv->pm) {
+                if (drv->pm->resume_noirq)
+                        error = drv->pm->resume_noirq(dev);
+        } else {
+                error = pci_legacy_resume_early(dev);
+        }
+
+        return error;
+}
+
+#else /* !CONFIG_SUSPEND */
+
+#define pci_pm_suspend          NULL
+#define pci_pm_suspend_noirq    NULL
+#define pci_pm_resume           NULL
+#define pci_pm_resume_noirq     NULL
+
+#endif /* !CONFIG_SUSPEND */
+
+#ifdef CONFIG_HIBERNATION
+
+static int pci_pm_freeze(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct device_driver *drv = dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm) {
+                if (drv->pm->freeze) {
+                        error = drv->pm->freeze(dev);
+                        suspend_report_result(drv->pm->freeze, error);
+                } else {
+                        pci_default_pm_suspend(pci_dev);
+                }
+        } else {
+                error = pci_legacy_suspend(dev, PMSG_FREEZE);
+                pci_fixup_device(pci_fixup_suspend, pci_dev);
+        }
+
+        return error;
+}
+
+static int pci_pm_freeze_noirq(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = pci_dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm) {
+                if (drv->pm->freeze_noirq) {
+                        error = drv->pm->freeze_noirq(dev);
+                        suspend_report_result(drv->pm->freeze_noirq, error);
+                }
+        } else {
+                error = pci_legacy_suspend_late(dev, PMSG_FREEZE);
+        }
+
+        return error;
+}
+
+static int pci_pm_thaw(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm) {
+                if (drv->pm->thaw)
+                        error =  drv->pm->thaw(dev);
+        } else {
+                pci_fixup_device(pci_fixup_resume, to_pci_dev(dev));
+                error = pci_legacy_resume(dev);
+        }
+
+        return error;
+}
+
+static int pci_pm_thaw_noirq(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = pci_dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm) {
+                if (drv->pm->thaw_noirq)
+                        error = drv->pm->thaw_noirq(dev);
+        } else {
+                pci_fixup_device(pci_fixup_resume_early, pci_dev);
+                error = pci_legacy_resume_early(dev);
+        }
+
+        return error;
+}
+
+static int pci_pm_poweroff(struct device *dev)
+{
+        struct device_driver *drv = dev->driver;
+        int error = 0;
+
+        pci_fixup_device(pci_fixup_suspend, to_pci_dev(dev));
+
+        if (drv && drv->pm) {
+                if (drv->pm->poweroff) {
+                        error = drv->pm->poweroff(dev);
+                        suspend_report_result(drv->pm->poweroff, error);
+                }
+        } else {
+                error = pci_legacy_suspend(dev, PMSG_HIBERNATE);
+        }
+
+        return error;
+}
+
+static int pci_pm_poweroff_noirq(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = pci_dev->driver;
+        int error = 0;
+
+        if (drv && drv->pm) {
+                if (drv->pm->poweroff_noirq) {
+                        error = drv->pm->poweroff_noirq(dev);
+                        suspend_report_result(drv->pm->poweroff_noirq, error);
+                }
+        } else {
+                error = pci_legacy_suspend_late(dev, PMSG_HIBERNATE);
+        }
+
+        return error;
+}
+
+static int pci_pm_restore(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct device_driver *drv = dev->driver;
+        int error;
+
+        if (drv && drv->pm) {
+                error = drv->pm->restore ? drv->pm->restore(dev) :
+                        pci_default_pm_resume(pci_dev);
+        } else {
+                error = pci_legacy_resume(dev);
+        }
+        pci_fixup_device(pci_fixup_resume, pci_dev);
+
+        return error;
+}
+
+static int pci_pm_restore_noirq(struct device *dev)
+{
+        struct pci_dev *pci_dev = to_pci_dev(dev);
+        struct pci_driver *drv = pci_dev->driver;
+        int error = 0;
+
+        pci_fixup_device(pci_fixup_resume, pci_dev);
+
+        if (drv && drv->pm) {
+                if (drv->pm->restore_noirq)
+                        error = drv->pm->restore_noirq(dev);
+        } else {
+                error = pci_legacy_resume_early(dev);
+        }
+        pci_fixup_device(pci_fixup_resume_early, pci_dev);
+
+        return error;
 }
 
+#else /* !CONFIG_HIBERNATION */
+
+#define pci_pm_freeze           NULL
+#define pci_pm_freeze_noirq     NULL
+#define pci_pm_thaw             NULL
+#define pci_pm_thaw_noirq       NULL
+#define pci_pm_poweroff         NULL
+#define pci_pm_poweroff_noirq   NULL
+#define pci_pm_restore          NULL
+#define pci_pm_restore_noirq    NULL
+
+#endif /* !CONFIG_HIBERNATION */
+
+struct pm_ext_ops pci_pm_ops = {
+        .base = {
+                .prepare = pci_pm_prepare,
+                .complete = pci_pm_complete,
+                .suspend = pci_pm_suspend,
+                .resume = pci_pm_resume,
+                .freeze = pci_pm_freeze,
+                .thaw = pci_pm_thaw,
+                .poweroff = pci_pm_poweroff,
+                .restore = pci_pm_restore,
+        },
+        .suspend_noirq = pci_pm_suspend_noirq,
+        .resume_noirq = pci_pm_resume_noirq,
+        .freeze_noirq = pci_pm_freeze_noirq,
+        .thaw_noirq = pci_pm_thaw_noirq,
+        .poweroff_noirq = pci_pm_poweroff_noirq,
+        .restore_noirq = pci_pm_restore_noirq,
+};
+
+#define PCI_PM_OPS_PTR  &pci_pm_ops
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define PCI_PM_OPS_PTR  NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
 /**
  * __pci_register_driver - register a new pci driver
  * @drv: the driver structure to register
@@ -390,6 +690,9 @@ int __pci_register_driver(struct pci_driver *drv, struct module *owner,
         drv->driver.owner = owner;
         drv->driver.mod_name = mod_name;
 
+        if (drv->pm)
+                drv->driver.pm = &drv->pm->base;
+
         spin_lock_init(&drv->dynids.lock);
         INIT_LIST_HEAD(&drv->dynids.list);
 
@@ -515,12 +818,9 @@ struct bus_type pci_bus_type = {
         .uevent         = pci_uevent,
         .probe          = pci_device_probe,
         .remove         = pci_device_remove,
-        .suspend        = pci_device_suspend,
-        .suspend_late   = pci_device_suspend_late,
-        .resume_early   = pci_device_resume_early,
-        .resume         = pci_device_resume,
         .shutdown       = pci_device_shutdown,
         .dev_attrs      = pci_dev_attrs,
+        .pm             = PCI_PM_OPS_PTR,
 };
 
 static int __init pci_driver_init(void)