diff options
| -rw-r--r-- | drivers/pci/hotplug/pciehp_acpi.c | 80 |
1 files changed, 76 insertions, 4 deletions
diff --git a/drivers/pci/hotplug/pciehp_acpi.c b/drivers/pci/hotplug/pciehp_acpi.c index 0cd49b728045..88a5c57f2e5b 100644 --- a/drivers/pci/hotplug/pciehp_acpi.c +++ b/drivers/pci/hotplug/pciehp_acpi.c @@ -28,15 +28,18 @@ #define PCIEHP_DETECT_PCIE (0) #define PCIEHP_DETECT_ACPI (1) -#define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_PCIE +#define PCIEHP_DETECT_AUTO (2) +#define PCIEHP_DETECT_DEFAULT PCIEHP_DETECT_AUTO static int slot_detection_mode; static char *pciehp_detect_mode; module_param(pciehp_detect_mode, charp, 0444); MODULE_PARM_DESC(pciehp_detect_mode, - "Slot detection mode: pcie, acpi\n" - " pcie - Use PCIe based slot detection (default)\n" - " acpi - Use ACPI for slot detection\n"); + "Slot detection mode: pcie, acpi, auto\n" + " pcie - Use PCIe based slot detection\n" + " acpi - Use ACPI for slot detection\n" + " auto(default) - Auto select mode. Use acpi option if duplicate\n" + " slot ids are found. Otherwise, use pcie option\n"); static int is_ejectable(acpi_handle handle) { @@ -103,12 +106,81 @@ static int __init parse_detect_mode(void) return PCIEHP_DETECT_PCIE; if (!strcmp(pciehp_detect_mode, "acpi")) return PCIEHP_DETECT_ACPI; + if (!strcmp(pciehp_detect_mode, "auto")) + return PCIEHP_DETECT_AUTO; warn("bad specifier '%s' for pciehp_detect_mode. Use default\n", pciehp_detect_mode); return PCIEHP_DETECT_DEFAULT; } +static struct pcie_port_service_id __initdata port_pci_ids[] = { + { + .vendor = PCI_ANY_ID, + .device = PCI_ANY_ID, + .port_type = PCIE_ANY_PORT, + .service_type = PCIE_PORT_SERVICE_HP, + .driver_data = 0, + }, { /* end: all zeroes */ } +}; + +static int __initdata dup_slot_id; +static int __initdata acpi_slot_detected; +static struct list_head __initdata dummy_slots = LIST_HEAD_INIT(dummy_slots); + +/* Dummy driver for dumplicate name detection */ +static int __init dummy_probe(struct pcie_device *dev, + const struct pcie_port_service_id *id) +{ + int pos; + u32 slot_cap; + struct slot *slot, *tmp; + struct pci_dev *pdev = dev->port; + if (!(slot = kzalloc(sizeof(*slot), GFP_KERNEL))) + return -ENOMEM; + /* Note: pciehp_detect_mode != PCIEHP_DETECT_ACPI here */ + if (pciehp_get_hp_hw_control_from_firmware(pdev)) + return -ENODEV; + if (!(pos = pci_find_capability(pdev, PCI_CAP_ID_EXP))) + return -ENODEV; + pci_read_config_dword(pdev, pos + PCI_EXP_SLTCAP, &slot_cap); + slot->number = slot_cap >> 19; + list_for_each_entry(tmp, &dummy_slots, slot_list) { + if (tmp->number == slot->number) + dup_slot_id++; + } + list_add_tail(&slot->slot_list, &dummy_slots); + if (!acpi_slot_detected && pciehp_detect_acpi_slot(pdev->subordinate)) + acpi_slot_detected = 1; + return -ENODEV; /* dummy driver always returns error */ +} + +static struct pcie_port_service_driver __initdata dummy_driver = { + .name = "pciehp_dummy", + .id_table = port_pci_ids, + .probe = dummy_probe, +}; + +static int __init select_detection_mode(void) +{ + struct slot *slot, *tmp; + pcie_port_service_register(&dummy_driver); + pcie_port_service_unregister(&dummy_driver); + list_for_each_entry_safe(slot, tmp, &dummy_slots, slot_list) { + list_del(&slot->slot_list); + kfree(slot); + } + if (acpi_slot_detected && dup_slot_id) + return PCIEHP_DETECT_ACPI; + return PCIEHP_DETECT_PCIE; +} + void __init pciehp_acpi_slot_detection_init(void) { slot_detection_mode = parse_detect_mode(); + if (slot_detection_mode != PCIEHP_DETECT_AUTO) + goto out; + slot_detection_mode = select_detection_mode(); +out: + if (slot_detection_mode == PCIEHP_DETECT_ACPI) + info("Using ACPI for slot detection.\n"); } |