On Thu, Aug 22, 2013 at 12:06:43AM +0200, Rafael J. Wysocki wrote:
> -> the prevailing convention for representing platform options like that
> seems to be to use a pointer to an object containing callback pointers. This
> is what we do for pci_platform_pm and for suspend_ops, hibernation_ops etc.
> I think it is just more flexible, because it allows the pointer to be left
> unset if there is an initialization error of some sort or a command line
> option disabling something is set etc.
Good points. I put merged the error checking into the original patch
and put it in my pci/misc branch. Here's the result; let me know if
anything needs to be tweaked.
PCI: Add pcibios_pm_ops for optional arch-specific hibernate functionality
From: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
Platforms may want to provide architecture-specific functionality when
a PCI device is doing a hibernate transition. Add a weak symbol
pcibios_pm_ops that architectures can override to do so.
[bhelgaas: fold in return value checks from v2 patch]
Signed-off-by: Sebastian Ott <sebott@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
---
drivers/pci/pci-driver.c | 43 +++++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 4 ++++
2 files changed, 47 insertions(+)
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index e6515e2..98f7b9b 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -763,6 +763,13 @@ static int pci_pm_resume(struct device *dev)
#ifdef CONFIG_HIBERNATE_CALLBACKS
+
+/*
+ * pcibios_pm_ops - provide arch-specific hooks when a PCI device is doing
+ * a hibernate transition
+ */
+struct dev_pm_ops __weak pcibios_pm_ops;
+
static int pci_pm_freeze(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
@@ -786,6 +793,9 @@ static int pci_pm_freeze(struct device *dev)
return error;
}
+ if (pcibios_pm_ops.freeze)
+ return pcibios_pm_ops.freeze(dev);
+
return 0;
}
@@ -811,6 +821,9 @@ static int pci_pm_freeze_noirq(struct device *dev)
pci_pm_set_unknown_state(pci_dev);
+ if (pcibios_pm_ops.freeze_noirq)
+ return pcibios_pm_ops.freeze_noirq(dev);
+
return 0;
}
@@ -820,6 +833,12 @@ static int pci_pm_thaw_noirq(struct device *dev)
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pcibios_pm_ops.thaw_noirq) {
+ error = pcibios_pm_ops.thaw_noirq(dev);
+ if (error)
+ return error;
+ }
+
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_resume_early(dev);
@@ -837,6 +856,12 @@ static int pci_pm_thaw(struct device *dev)
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int error = 0;
+ if (pcibios_pm_ops.thaw) {
+ error = pcibios_pm_ops.thaw(dev);
+ if (error)
+ return error;
+ }
+
if (pci_has_legacy_pm_support(pci_dev))
return pci_legacy_resume(dev);
@@ -878,6 +903,9 @@ static int pci_pm_poweroff(struct device *dev)
Fixup:
pci_fixup_device(pci_fixup_suspend, pci_dev);
+ if (pcibios_pm_ops.poweroff)
+ return pcibios_pm_ops.poweroff(dev);
+
return 0;
}
@@ -911,6 +939,9 @@ static int pci_pm_poweroff_noirq(struct device *dev)
if (pci_dev->class == PCI_CLASS_SERIAL_USB_EHCI)
pci_write_config_word(pci_dev, PCI_COMMAND, 0);
+ if (pcibios_pm_ops.poweroff_noirq)
+ return pcibios_pm_ops.poweroff_noirq(dev);
+
return 0;
}
@@ -920,6 +951,12 @@ static int pci_pm_restore_noirq(struct device *dev)
struct device_driver *drv = dev->driver;
int error = 0;
+ if (pcibios_pm_ops.restore_noirq) {
+ error = pcibios_pm_ops.restore_noirq(dev);
+ if (error)
+ return error;
+ }
+
pci_pm_default_resume_early(pci_dev);
if (pci_has_legacy_pm_support(pci_dev))
@@ -937,6 +974,12 @@ static int pci_pm_restore(struct device *dev)
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int error = 0;
+ if (pcibios_pm_ops.restore) {
+ error = pcibios_pm_ops.restore(dev);
+ if (error)
+ return error;
+ }
+
/*
* This is necessary for the hibernation error path in which restore is
* called without restoring the standard config registers of the device.
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 0fd1f15..89ed123 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1648,6 +1648,10 @@ int pcibios_set_pcie_reset_state(struct pci_dev *dev,
int pcibios_add_device(struct pci_dev *dev);
void pcibios_release_device(struct pci_dev *dev);
+#ifdef CONFIG_HIBERNATE_CALLBACKS
+extern struct dev_pm_ops pcibios_pm_ops;
+#endif
+
#ifdef CONFIG_PCI_MMCONFIG
void __init pci_mmcfg_early_init(void);
void __init pci_mmcfg_late_init(void);
--
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