linux/drivers/acpi/pci_bind.c
Rajesh Shah c431ada45d [PATCH] acpi bridge hotadd: ACPI based root bridge hot-add
When you hot-plug a (root) bridge hierarchy, it may have p2p bridges and
devices attached to it that have not been configured by firmware.  In this
case, we need to configure the devices before starting them.  This patch
separates device start from device scan so that we can introduce the
configuration step in the middle.

I kept the existing semantics for pci_scan_bus() since there are a huge number
of callers to that function.

Also, I have no way of testing the changes I made to the parisc files, so this
needs review by those folks.  Sorry for the massive cross-post, this touches
files in many different places.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-06-27 21:52:39 -07:00

399 lines
10 KiB
C

/*
* pci_bind.c - ACPI PCI Device Binding ($Revision: 2 $)
*
* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/acpi.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
#define _COMPONENT ACPI_PCI_COMPONENT
ACPI_MODULE_NAME ("pci_bind")
struct acpi_pci_data {
struct acpi_pci_id id;
struct pci_bus *bus;
struct pci_dev *dev;
};
void
acpi_pci_data_handler (
acpi_handle handle,
u32 function,
void *context)
{
ACPI_FUNCTION_TRACE("acpi_pci_data_handler");
/* TBD: Anything we need to do here? */
return_VOID;
}
/**
* acpi_os_get_pci_id
* ------------------
* This function is used by the ACPI Interpreter (a.k.a. Core Subsystem)
* to resolve PCI information for ACPI-PCI devices defined in the namespace.
* This typically occurs when resolving PCI operation region information.
*/
#ifdef ACPI_FUTURE_USAGE
acpi_status
acpi_os_get_pci_id (
acpi_handle handle,
struct acpi_pci_id *id)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_device *device = NULL;
struct acpi_pci_data *data = NULL;
ACPI_FUNCTION_TRACE("acpi_os_get_pci_id");
if (!id)
return_ACPI_STATUS(AE_BAD_PARAMETER);
result = acpi_bus_get_device(handle, &device);
if (result) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid ACPI Bus context for device %s\n",
acpi_device_bid(device)));
return_ACPI_STATUS(AE_NOT_EXIST);
}
status = acpi_get_data(handle, acpi_pci_data_handler, (void**) &data);
if (ACPI_FAILURE(status) || !data || !data->dev) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid ACPI-PCI context for device %s\n",
acpi_device_bid(device)));
return_ACPI_STATUS(status);
}
*id = data->id;
/*
id->segment = data->id.segment;
id->bus = data->id.bus;
id->device = data->id.device;
id->function = data->id.function;
*/
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Device %s has PCI address %02x:%02x:%02x.%02x\n",
acpi_device_bid(device), id->segment, id->bus,
id->device, id->function));
return_ACPI_STATUS(AE_OK);
}
#endif /* ACPI_FUTURE_USAGE */
int
acpi_pci_bind (
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_pci_data *data = NULL;
struct acpi_pci_data *pdata = NULL;
char *pathname = NULL;
struct acpi_buffer buffer = {0, NULL};
acpi_handle handle = NULL;
struct pci_dev *dev;
struct pci_bus *bus;
ACPI_FUNCTION_TRACE("acpi_pci_bind");
if (!device || !device->parent)
return_VALUE(-EINVAL);
pathname = kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if(!pathname)
return_VALUE(-ENOMEM);
memset(pathname, 0, ACPI_PATHNAME_MAX);
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
if (!data){
kfree (pathname);
return_VALUE(-ENOMEM);
}
memset(data, 0, sizeof(struct acpi_pci_data));
acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI device [%s]...\n",
pathname));
/*
* Segment & Bus
* -------------
* These are obtained via the parent device's ACPI-PCI context.
*/
status = acpi_get_data(device->parent->handle, acpi_pci_data_handler,
(void**) &pdata);
if (ACPI_FAILURE(status) || !pdata || !pdata->bus) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Invalid ACPI-PCI context for parent device %s\n",
acpi_device_bid(device->parent)));
result = -ENODEV;
goto end;
}
data->id.segment = pdata->id.segment;
data->id.bus = pdata->bus->number;
/*
* Device & Function
* -----------------
* These are simply obtained from the device's _ADR method. Note
* that a value of zero is valid.
*/
data->id.device = device->pnp.bus_address >> 16;
data->id.function = device->pnp.bus_address & 0xFFFF;
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "...to %02x:%02x:%02x.%02x\n",
data->id.segment, data->id.bus, data->id.device,
data->id.function));
/*
* TBD: Support slot devices (e.g. function=0xFFFF).
*/
/*
* Locate PCI Device
* -----------------
* Locate matching device in PCI namespace. If it doesn't exist
* this typically means that the device isn't currently inserted
* (e.g. docking station, port replicator, etc.).
* We cannot simply search the global pci device list, since
* PCI devices are added to the global pci list when the root
* bridge start ops are run, which may not have happened yet.
*/
bus = pci_find_bus(data->id.segment, data->id.bus);
if (bus) {
list_for_each_entry(dev, &bus->devices, bus_list) {
if (dev->devfn == PCI_DEVFN(data->id.device,
data->id.function)) {
data->dev = dev;
break;
}
}
}
if (!data->dev) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Device %02x:%02x:%02x.%02x not present in PCI namespace\n",
data->id.segment, data->id.bus,
data->id.device, data->id.function));
result = -ENODEV;
goto end;
}
if (!data->dev->bus) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Device %02x:%02x:%02x.%02x has invalid 'bus' field\n",
data->id.segment, data->id.bus,
data->id.device, data->id.function));
result = -ENODEV;
goto end;
}
/*
* PCI Bridge?
* -----------
* If so, set the 'bus' field and install the 'bind' function to
* facilitate callbacks for all of its children.
*/
if (data->dev->subordinate) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Device %02x:%02x:%02x.%02x is a PCI bridge\n",
data->id.segment, data->id.bus,
data->id.device, data->id.function));
data->bus = data->dev->subordinate;
device->ops.bind = acpi_pci_bind;
device->ops.unbind = acpi_pci_unbind;
}
/*
* Attach ACPI-PCI Context
* -----------------------
* Thus binding the ACPI and PCI devices.
*/
status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to attach ACPI-PCI context to device %s\n",
acpi_device_bid(device)));
result = -ENODEV;
goto end;
}
/*
* PCI Routing Table
* -----------------
* Evaluate and parse _PRT, if exists. This code is independent of
* PCI bridges (above) to allow parsing of _PRT objects within the
* scope of non-bridge devices. Note that _PRTs within the scope of
* a PCI bridge assume the bridge's subordinate bus number.
*
* TBD: Can _PRTs exist within the scope of non-bridge PCI devices?
*/
status = acpi_get_handle(device->handle, METHOD_NAME__PRT, &handle);
if (ACPI_SUCCESS(status)) {
if (data->bus) /* PCI-PCI bridge */
acpi_pci_irq_add_prt(device->handle, data->id.segment,
data->bus->number);
else /* non-bridge PCI device */
acpi_pci_irq_add_prt(device->handle, data->id.segment,
data->id.bus);
}
end:
kfree(pathname);
if (result)
kfree(data);
return_VALUE(result);
}
int acpi_pci_unbind(
struct acpi_device *device)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_pci_data *data = NULL;
char *pathname = NULL;
struct acpi_buffer buffer = {0, NULL};
ACPI_FUNCTION_TRACE("acpi_pci_unbind");
if (!device || !device->parent)
return_VALUE(-EINVAL);
pathname = (char *) kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if(!pathname)
return_VALUE(-ENOMEM);
memset(pathname, 0, ACPI_PATHNAME_MAX);
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unbinding PCI device [%s]...\n",
pathname));
kfree(pathname);
status = acpi_get_data(device->handle, acpi_pci_data_handler, (void**)&data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to get data from device %s\n",
acpi_device_bid(device)));
result = -ENODEV;
goto end;
}
status = acpi_detach_data(device->handle, acpi_pci_data_handler);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to detach data from device %s\n",
acpi_device_bid(device)));
result = -ENODEV;
goto end;
}
if (data->dev->subordinate) {
acpi_pci_irq_del_prt(data->id.segment, data->bus->number);
}
kfree(data);
end:
return_VALUE(result);
}
int
acpi_pci_bind_root (
struct acpi_device *device,
struct acpi_pci_id *id,
struct pci_bus *bus)
{
int result = 0;
acpi_status status = AE_OK;
struct acpi_pci_data *data = NULL;
char *pathname = NULL;
struct acpi_buffer buffer = {0, NULL};
ACPI_FUNCTION_TRACE("acpi_pci_bind_root");
pathname = (char *)kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
if(!pathname)
return_VALUE(-ENOMEM);
memset(pathname, 0, ACPI_PATHNAME_MAX);
buffer.length = ACPI_PATHNAME_MAX;
buffer.pointer = pathname;
if (!device || !id || !bus){
kfree(pathname);
return_VALUE(-EINVAL);
}
data = kmalloc(sizeof(struct acpi_pci_data), GFP_KERNEL);
if (!data){
kfree(pathname);
return_VALUE(-ENOMEM);
}
memset(data, 0, sizeof(struct acpi_pci_data));
data->id = *id;
data->bus = bus;
device->ops.bind = acpi_pci_bind;
device->ops.unbind = acpi_pci_unbind;
acpi_get_name(device->handle, ACPI_FULL_PATHNAME, &buffer);
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Binding PCI root bridge [%s] to "
"%02x:%02x\n", pathname, id->segment, id->bus));
status = acpi_attach_data(device->handle, acpi_pci_data_handler, data);
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
"Unable to attach ACPI-PCI context to device %s\n",
pathname));
result = -ENODEV;
goto end;
}
end:
kfree(pathname);
if (result != 0)
kfree(data);
return_VALUE(result);
}