Commit a0d399a8 authored by Kenji Kaneshige's avatar Kenji Kaneshige Committed by Greg Kroah-Hartman
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[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: default avatarKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 0e888adc
......@@ -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;
}
......
......@@ -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
......
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