/* pci_get_hp_params
*
* @dev - the pci_dev for which we want parameters
* @hpp - allocated by the caller
*/
int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
{
acpi_status status;
acpi_handle handle, phandle;
struct pci_bus *pbus;
handle = NULL;
for (pbus = dev->bus; pbus; pbus = pbus->parent) {
handle = acpi_pci_get_bridge_handle(pbus);
if (handle)
break;
}
/*
* _HPP settings apply to all child buses, until another _HPP is
* encountered. If we don't find an _HPP for the input pci dev,
* look for it in the parent device scope since that would apply to
* this pci dev.
*/
while (handle) {
status = acpi_run_hpx(handle, hpp);
if (ACPI_SUCCESS(status))
return 0;
status = acpi_run_hpp(handle, hpp);
if (ACPI_SUCCESS(status))
return 0;
if (acpi_is_root_bridge(handle))
break;
status = acpi_get_parent(handle, &phandle);
if (ACPI_FAILURE(status))
break;
handle = phandle;
}
return -ENODEV;
}
/* acpi_get_hp_params_from_firmware
*
* @bus - the pci_bus of the bus on which the device is newly added
* @hpp - allocated by the caller
*/
acpi_status acpi_get_hp_params_from_firmware(struct pci_bus *bus,
struct hotplug_params *hpp)
{
acpi_status status = AE_NOT_FOUND;
acpi_handle handle, phandle;
struct pci_bus *pbus = bus;
struct pci_dev *pdev;
do {
pdev = pbus->self;
if (!pdev) {
handle = acpi_get_pci_rootbridge_handle(
pci_domain_nr(pbus), pbus->number);
break;
}
handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
pbus = pbus->parent;
} while (!handle);
/*
* _HPP settings apply to all child buses, until another _HPP is
* encountered. If we don't find an _HPP for the input pci dev,
* look for it in the parent device scope since that would apply to
* this pci dev. If we don't find any _HPP, use hardcoded defaults
*/
while (handle) {
status = acpi_run_hpx(handle, hpp);
if (ACPI_SUCCESS(status))
break;
status = acpi_run_hpp(handle, hpp);
if (ACPI_SUCCESS(status))
break;
if (acpi_root_bridge(handle))
break;
status = acpi_get_parent(handle, &phandle);
if (ACPI_FAILURE(status))
break;
handle = phandle;
}
return status;
}
void pciehp_get_hp_params_from_firmware(struct pci_dev *dev,
struct hotplug_params *hpp)
{
acpi_status status = AE_NOT_FOUND;
struct pci_dev *pdev = dev;
/*
* _HPP settings apply to all child buses, until another _HPP is
* encountered. If we don't find an _HPP for the input pci dev,
* look for it in the parent device scope since that would apply to
* this pci dev. If we don't find any _HPP, use hardcoded defaults
*/
while (pdev && (ACPI_FAILURE(status))) {
acpi_handle handle = DEVICE_ACPI_HANDLE(&(pdev->dev));
if (!handle)
break;
status = acpi_run_hpp(handle, hpp);
if (!(pdev->bus->parent))
break;
/* Check if a parent object supports _HPP */
pdev = pdev->bus->parent->self;
}
}
