[PATCH] ACPI based I/O APIC hot-plug: acpiphp support

This patch adds PCI based I/O xAPIC hot-add support to ACPIPHP
driver. When PCI root bridge is hot-added, all PCI based I/O xAPICs
under the root bridge are hot-added by this patch. Hot-remove support
is TBD.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index b4a921236252cee42eed9f991c610c95824e831c..424e7de181aed457457374830ea059c3be1833fa 100644 (file)
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -552,6 +552,132 @@ static void remove_bridge(acpi_handle handle)
        }
 }
 
+static struct pci_dev * get_apic_pci_info(acpi_handle handle)
+{
+       struct acpi_pci_id id;
+       struct pci_bus *bus;
+       struct pci_dev *dev;
+
+       if (ACPI_FAILURE(acpi_get_pci_id(handle, &id)))
+               return NULL;
+
+       bus = pci_find_bus(id.segment, id.bus);
+       if (!bus)
+               return NULL;
+
+       dev = pci_get_slot(bus, PCI_DEVFN(id.device, id.function));
+       if (!dev)
+               return NULL;
+
+       if ((dev->class != PCI_CLASS_SYSTEM_PIC_IOAPIC) &&
+           (dev->class != PCI_CLASS_SYSTEM_PIC_IOXAPIC))
+       {
+               pci_dev_put(dev);
+               return NULL;
+       }
+
+       return dev;
+}
+
+static int get_gsi_base(acpi_handle handle, u32 *gsi_base)
+{
+       acpi_status status;
+       int result = -1;
+       unsigned long gsb;
+       struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
+       union acpi_object *obj;
+       void *table;
+
+       status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsb);
+       if (ACPI_SUCCESS(status)) {
+               *gsi_base = (u32)gsb;
+               return 0;
+       }
+
+       status = acpi_evaluate_object(handle, "_MAT", NULL, &buffer);
+       if (ACPI_FAILURE(status) || !buffer.length || !buffer.pointer)
+               return -1;
+
+       obj = buffer.pointer;
+       if (obj->type != ACPI_TYPE_BUFFER)
+               goto out;
+
+       table = obj->buffer.pointer;
+       switch (((acpi_table_entry_header *)table)->type) {
+       case ACPI_MADT_IOSAPIC:
+               *gsi_base = ((struct acpi_table_iosapic *)table)->global_irq_base;
+               result = 0;
+               break;
+       case ACPI_MADT_IOAPIC:
+               *gsi_base = ((struct acpi_table_ioapic *)table)->global_irq_base;
+               result = 0;
+               break;
+       default:
+               break;
+       }
+ out:
+       acpi_os_free(buffer.pointer);
+       return result;
+}
+
+static acpi_status
+ioapic_add(acpi_handle handle, u32 lvl, void *context, void **rv)
+{
+       acpi_status status;
+       unsigned long sta;
+       acpi_handle tmp;
+       struct pci_dev *pdev;
+       u32 gsi_base;
+       u64 phys_addr;
+
+       /* Evaluate _STA if present */
+       status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
+       if (ACPI_SUCCESS(status) && sta != ACPI_STA_ALL)
+               return AE_CTRL_DEPTH;
+
+       /* Scan only PCI bus scope */
+       status = acpi_get_handle(handle, "_HID", &tmp);
+       if (ACPI_SUCCESS(status))
+               return AE_CTRL_DEPTH;
+
+       if (get_gsi_base(handle, &gsi_base))
+               return AE_OK;
+
+       pdev = get_apic_pci_info(handle);
+       if (!pdev)
+               return AE_OK;
+
+       if (pci_enable_device(pdev)) {
+               pci_dev_put(pdev);
+               return AE_OK;
+       }
+
+       pci_set_master(pdev);
+
+       if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
+               pci_disable_device(pdev);
+               pci_dev_put(pdev);
+               return AE_OK;
+       }
+
+       phys_addr = pci_resource_start(pdev, 0);
+       if (acpi_register_ioapic(handle, phys_addr, gsi_base)) {
+               pci_release_region(pdev, 0);
+               pci_disable_device(pdev);
+               pci_dev_put(pdev);
+               return AE_OK;
+       }
+
+       return AE_OK;
+}
+
+static int acpiphp_configure_ioapics(acpi_handle handle)
+{
+       acpi_walk_namespace(ACPI_TYPE_DEVICE, handle,
+                           ACPI_UINT32_MAX, ioapic_add, NULL, NULL);
+       return 0;
+}
+
 static int power_on_slot(struct acpiphp_slot *slot)
 {
        acpi_status status;
@@ -942,6 +1068,7 @@ static int acpiphp_configure_bridge (acpi_handle handle)
        acpiphp_sanitize_bus(bus);
        acpiphp_set_hpp_values(handle, bus);
        pci_enable_bridges(bus);
+       acpiphp_configure_ioapics(handle);
        return 0;
 }
 

diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
index bf608808a60c494abe3a65edbcf56ec8f60e3032..810bbbcee404bea049c3b8bbb263f9278da94a48 100644 (file)
--- a/include/linux/pci_ids.h
+++ b/include/linux/pci_ids.h
@@ -62,6 +62,8 @@
 
 #define PCI_BASE_CLASS_SYSTEM          0x08
 #define PCI_CLASS_SYSTEM_PIC           0x0800
+#define PCI_CLASS_SYSTEM_PIC_IOAPIC    0x080010
+#define PCI_CLASS_SYSTEM_PIC_IOXAPIC   0x080020
 #define PCI_CLASS_SYSTEM_DMA           0x0801
 #define PCI_CLASS_SYSTEM_TIMER         0x0802
 #define PCI_CLASS_SYSTEM_RTC           0x0803