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PCI: pciehp: add ACPI based slot detection

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There is a problem that some non hot-pluggable PCIe slots are detected
as hot-pluggable by pciehp on some platforms. The immediate cause of
this problem is that hot-plug capable bit in the Slot Capabilities
register is set even for non hot-pluggable slots on those platforms.
It seems a BIOS/hardware problem, but we need workaround about that.

Some of those platforms define hot-pluggable PCIe slots on ACPI
namespace properly, while hot-plug capable bit in the Slot
Capabilities register is set improperly. So using ACPI namespace
information in pciehp to detect PCIe hot-pluggable slots would be a
workaround.

This patch adds 'pciehp_detect_mode' module option. When 'acpi' is
specified, pciehp uses ACPI namespace information to detect PCIe
hot-pluggable slots.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Kenji Kaneshige
2008-12-17 12:07:38 +09:00
committed by Jesse Barnes
parent 873392ca51
commit c9ffa5a586
4 changed files with 132 additions and 1 deletions
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15
drivers/pci/hotplug/pciehp.h
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@@ -220,11 +220,23 @@ struct hpc_ops {
#include <acpi/actypes.h>
#include <linux/pci-acpi.h>
extern void __init pciehp_acpi_slot_detection_init(void);
extern int pciehp_acpi_slot_detection_check(struct pci_dev *dev);
static inline void pciehp_firmware_init(void)
{
pciehp_acpi_slot_detection_init();
}
static inline int pciehp_get_hp_hw_control_from_firmware(struct pci_dev *dev)
{
int retval;
u32 flags = (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
return acpi_get_hp_hw_control_from_firmware(dev, flags);
retval = acpi_get_hp_hw_control_from_firmware(dev, flags);
if (retval)
return retval;
return pciehp_acpi_slot_detection_check(dev);
}
static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev,
@@ -235,6 +247,7 @@ static inline int pciehp_get_hp_params_from_firmware(struct pci_dev *dev,
return 0;
}
#else
#define pciehp_firmware_init() do {} while (0)
#define pciehp_get_hp_hw_control_from_firmware(dev) 0
#define pciehp_get_hp_params_from_firmware(dev, hpp) (-ENODEV)
#endif /* CONFIG_ACPI */