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![rajesh.shah@intel.com](/assets/img/avatar_default.png)
This patch further tweaks how we request control of hotplug controller hardware from BIOS. We first search the ACPI namespace corresponding to a specific hotplug controller looking for an _OSC or OSHP method. On failure, we successively move to the ACPI parent object, till we hit the highest level host bridge in the hierarchy. This allows for different types of BIOS's which place the _OSC/OSHP methods at various places in the acpi namespace, while still not encroaching on the namespace of some other root level host bridge. This patch also introduces a new load time option (pciehp_force) that allows us to bypass all _OSC/OSHP checking. Not supporting these methods seems to be be the most common ACPI firmware problem we've run into. This will still _not_ allow the pciehp driver to work correctly if the BIOS really doesn't support pciehp (i.e. if it doesn't generate a hotplug interrupt). Use this option with caution. Some BIOS's may deliberately not build any _OSC/OSHP methods to make sure it retains control the hotplug hardware. Using the pciehp_force parameter for such systems can lead to two separate entities trying to control the same hardware. Signed-off-by: Rajesh Shah <rajesh.shah@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
360 lines
8.4 KiB
C
360 lines
8.4 KiB
C
/*
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* Link physical devices with ACPI devices support
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*
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* Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com>
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* Copyright (c) 2005 Intel Corp.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/device.h>
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#include <linux/rwsem.h>
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#include <linux/acpi.h>
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#define ACPI_GLUE_DEBUG 0
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#if ACPI_GLUE_DEBUG
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#define DBG(x...) printk(PREFIX x)
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#else
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#define DBG(x...)
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#endif
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static LIST_HEAD(bus_type_list);
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static DECLARE_RWSEM(bus_type_sem);
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int register_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return -ENODEV;
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if (type && type->bus && type->find_device) {
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down_write(&bus_type_sem);
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list_add_tail(&type->list, &bus_type_list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "bus type %s registered\n",
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type->bus->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(register_acpi_bus_type);
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int unregister_acpi_bus_type(struct acpi_bus_type *type)
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{
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if (acpi_disabled)
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return 0;
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if (type) {
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down_write(&bus_type_sem);
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list_del_init(&type->list);
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up_write(&bus_type_sem);
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printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
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type->bus->name);
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return 0;
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}
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return -ENODEV;
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}
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EXPORT_SYMBOL(unregister_acpi_bus_type);
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static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
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{
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struct acpi_bus_type *tmp, *ret = NULL;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->bus == type) {
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ret = tmp;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
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{
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struct acpi_bus_type *tmp;
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int ret = -ENODEV;
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down_read(&bus_type_sem);
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list_for_each_entry(tmp, &bus_type_list, list) {
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if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
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ret = 0;
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break;
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}
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}
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up_read(&bus_type_sem);
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return ret;
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}
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/* Get PCI root bridge's handle from its segment and bus number */
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struct acpi_find_pci_root {
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unsigned int seg;
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unsigned int bus;
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acpi_handle handle;
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};
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static acpi_status
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do_root_bridge_busnr_callback(struct acpi_resource *resource, void *data)
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{
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unsigned long *busnr = (unsigned long *)data;
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struct acpi_resource_address64 address;
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if (resource->id != ACPI_RSTYPE_ADDRESS16 &&
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resource->id != ACPI_RSTYPE_ADDRESS32 &&
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resource->id != ACPI_RSTYPE_ADDRESS64)
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return AE_OK;
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acpi_resource_to_address64(resource, &address);
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if ((address.address_length > 0) &&
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(address.resource_type == ACPI_BUS_NUMBER_RANGE))
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*busnr = address.min_address_range;
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return AE_OK;
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}
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static int get_root_bridge_busnr(acpi_handle handle)
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{
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acpi_status status;
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unsigned long bus, bbn;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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status = acpi_evaluate_integer(handle, METHOD_NAME__BBN, NULL,
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&bbn);
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if (status == AE_NOT_FOUND) {
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/* Assume bus = 0 */
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printk(KERN_INFO PREFIX
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"Assume root bridge [%s] bus is 0\n",
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(char *)buffer.pointer);
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status = AE_OK;
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bbn = 0;
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}
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if (ACPI_FAILURE(status)) {
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bbn = -ENODEV;
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goto exit;
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}
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if (bbn > 0)
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goto exit;
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/* _BBN in some systems return 0 for all root bridges */
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bus = -1;
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status = acpi_walk_resources(handle, METHOD_NAME__CRS,
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do_root_bridge_busnr_callback, &bus);
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/* If _CRS failed, we just use _BBN */
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if (ACPI_FAILURE(status) || (bus == -1))
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goto exit;
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/* We select _CRS */
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if (bbn != bus) {
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printk(KERN_INFO PREFIX
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"_BBN and _CRS returns different value for %s. Select _CRS\n",
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(char *)buffer.pointer);
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bbn = bus;
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}
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exit:
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acpi_os_free(buffer.pointer);
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return (int)bbn;
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}
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static acpi_status
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find_pci_rootbridge(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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struct acpi_find_pci_root *find = (struct acpi_find_pci_root *)context;
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unsigned long seg, bus;
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acpi_status status;
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int tmp;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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status = acpi_evaluate_integer(handle, METHOD_NAME__SEG, NULL, &seg);
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if (status == AE_NOT_FOUND) {
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/* Assume seg = 0 */
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status = AE_OK;
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seg = 0;
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}
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if (ACPI_FAILURE(status)) {
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status = AE_CTRL_DEPTH;
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goto exit;
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}
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tmp = get_root_bridge_busnr(handle);
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if (tmp < 0) {
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printk(KERN_ERR PREFIX
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"Find root bridge failed for %s\n",
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(char *)buffer.pointer);
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status = AE_CTRL_DEPTH;
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goto exit;
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}
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bus = tmp;
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if (seg == find->seg && bus == find->bus)
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find->handle = handle;
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status = AE_OK;
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exit:
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acpi_os_free(buffer.pointer);
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return status;
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}
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acpi_handle acpi_get_pci_rootbridge_handle(unsigned int seg, unsigned int bus)
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{
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struct acpi_find_pci_root find = { seg, bus, NULL };
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acpi_get_devices(PCI_ROOT_HID_STRING, find_pci_rootbridge, &find, NULL);
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return find.handle;
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}
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EXPORT_SYMBOL_GPL(acpi_get_pci_rootbridge_handle);
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/* Get device's handler per its address under its parent */
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struct acpi_find_child {
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acpi_handle handle;
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acpi_integer address;
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};
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static acpi_status
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do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
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{
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acpi_status status;
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struct acpi_device_info *info;
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_find_child *find = (struct acpi_find_child *)context;
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status = acpi_get_object_info(handle, &buffer);
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if (ACPI_SUCCESS(status)) {
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info = buffer.pointer;
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if (info->address == find->address)
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find->handle = handle;
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acpi_os_free(buffer.pointer);
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}
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return AE_OK;
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}
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acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
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{
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struct acpi_find_child find = { NULL, address };
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if (!parent)
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return NULL;
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acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
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1, do_acpi_find_child, &find, NULL);
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return find.handle;
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}
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EXPORT_SYMBOL(acpi_get_child);
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/* Link ACPI devices with physical devices */
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static void acpi_glue_data_handler(acpi_handle handle,
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u32 function, void *context)
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{
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/* we provide an empty handler */
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}
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/* Note: a success call will increase reference count by one */
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struct device *acpi_get_physical_device(acpi_handle handle)
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{
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acpi_status status;
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struct device *dev;
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status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
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if (ACPI_SUCCESS(status))
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return get_device(dev);
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return NULL;
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}
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EXPORT_SYMBOL(acpi_get_physical_device);
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static int acpi_bind_one(struct device *dev, acpi_handle handle)
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{
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acpi_status status;
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if (dev->firmware_data) {
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printk(KERN_WARNING PREFIX
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"Drivers changed 'firmware_data' for %s\n", dev->bus_id);
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return -EINVAL;
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}
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get_device(dev);
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status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
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if (ACPI_FAILURE(status)) {
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put_device(dev);
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return -EINVAL;
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}
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dev->firmware_data = handle;
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return 0;
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}
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static int acpi_unbind_one(struct device *dev)
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{
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if (!dev->firmware_data)
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return 0;
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if (dev == acpi_get_physical_device(dev->firmware_data)) {
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/* acpi_get_physical_device increase refcnt by one */
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put_device(dev);
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acpi_detach_data(dev->firmware_data, acpi_glue_data_handler);
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dev->firmware_data = NULL;
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/* acpi_bind_one increase refcnt by one */
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put_device(dev);
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} else {
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printk(KERN_ERR PREFIX
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"Oops, 'firmware_data' corrupt for %s\n", dev->bus_id);
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}
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return 0;
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}
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static int acpi_platform_notify(struct device *dev)
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{
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struct acpi_bus_type *type;
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acpi_handle handle;
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int ret = -EINVAL;
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if (!dev->bus || !dev->parent) {
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/* bridge devices genernally haven't bus or parent */
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ret = acpi_find_bridge_device(dev, &handle);
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goto end;
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}
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type = acpi_get_bus_type(dev->bus);
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if (!type) {
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DBG("No ACPI bus support for %s\n", dev->bus_id);
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ret = -EINVAL;
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goto end;
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}
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if ((ret = type->find_device(dev, &handle)) != 0)
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DBG("Can't get handler for %s\n", dev->bus_id);
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end:
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if (!ret)
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acpi_bind_one(dev, handle);
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#if ACPI_GLUE_DEBUG
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if (!ret) {
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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acpi_get_name(dev->firmware_data, ACPI_FULL_PATHNAME, &buffer);
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DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
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acpi_os_free(buffer.pointer);
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} else
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DBG("Device %s -> No ACPI support\n", dev->bus_id);
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#endif
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return ret;
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}
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static int acpi_platform_notify_remove(struct device *dev)
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{
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acpi_unbind_one(dev);
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return 0;
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}
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static int __init init_acpi_device_notify(void)
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{
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if (acpi_disabled)
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return 0;
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if (platform_notify || platform_notify_remove) {
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printk(KERN_ERR PREFIX "Can't use platform_notify\n");
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return 0;
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}
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platform_notify = acpi_platform_notify;
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platform_notify_remove = acpi_platform_notify_remove;
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return 0;
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}
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arch_initcall(init_acpi_device_notify);
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