[RFC/PATCH 3/3] ACPI based I/O APIC hot-plug

Kenji Kaneshige
2005-04-21T13:39:45Z

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>

---

linux-2.6.12-rc2-mm3-kanesige/drivers/pci/hotplug/acpiphp_glue.c | 120 ++++++++++
1 files changed, 120 insertions(+)

diff -puN drivers/pci/hotplug/acpiphp_glue.c~acpiphp_ioapic_add drivers/pci/hotplug/acpiphp_glue.c
--- linux-2.6.12-rc2-mm3/drivers/pci/hotplug/acpiphp_glue.c~acpiphp_ioapic_add 2005-04-20 10:51:56.000000000 +0900
+++ linux-2.6.12-rc2-mm3-kanesige/drivers/pci/hotplug/acpiphp_glue.c 2005-04-21 19:18:05.000000000 +0900
@@ -552,6 +552,125 @@ static void remove_bridge(acpi_handle ha
}
}

+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;
+
+ list_for_each_entry(dev, &bus->devices, bus_list) {
+ if (dev->devfn != PCI_DEVFN(id.device, id.function))
+ continue;
+ if ((dev->class >> 8) != PCI_CLASS_SYSTEM_PIC)
+ continue;
+ if ((dev->class & 0xff) == 0x10 || (dev->class & 0xff) == 0x20)
+ return dev;
+ }
+ return NULL;
+}
+
+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 result;
+
+ 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;
+
+ pdev = get_apic_pci_info(handle);
+ if (!pdev)
+ return AE_OK;
+
+ if (get_gsi_base(handle, &gsi_base))
+ return AE_OK;
+
+ if (pci_enable_device(pdev))
+ return AE_OK;
+
+ pci_set_master(pdev);
+
+ if (pci_request_region(pdev, 0, "I/O APIC(acpiphp)")) {
+ pci_disable_device(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);
+ 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 +1061,7 @@ static int acpiphp_configure_bridge (acp
acpiphp_sanitize_bus(bus);
acpiphp_set_hpp_values(handle, bus);
pci_enable_bridges(bus);
+ acpiphp_configure_ioapics(handle);
return 0;
}

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