pci_hotplug_util.c
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上传日期:2013-02-24
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- /*
- * PCI HotPlug Utility functions
- *
- * Copyright (c) 1995,2001 Compaq Computer Corporation
- * Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
- * Copyright (c) 2001 IBM Corp.
- *
- * All rights reserved.
- *
- * 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, GOOD TITLE or
- * NON INFRINGEMENT. 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * Send feedback to <greg@kroah.com>
- *
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <linux/slab.h>
- #include <linux/pci.h>
- #include "pci_hotplug.h"
- #if !defined(CONFIG_HOTPLUG_PCI_MODULE)
- #define MY_NAME "pci_hotplug"
- #else
- #define MY_NAME THIS_MODULE->name
- #endif
- #define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: "__FUNCTION__": " fmt , MY_NAME , ## arg); } while (0)
- #define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
- #define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
- #define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
- /* local variables */
- static int debug;
- static int build_dev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, struct pci_dev **pci_dev)
- {
- struct pci_dev *my_dev;
- struct pci_bus *my_bus;
- /* Some validity checks. */
- if ((function > 7) ||
- (slot > 31) ||
- (pci_dev == NULL) ||
- (ops == NULL))
- return -ENODEV;
- my_dev = kmalloc (sizeof (struct pci_dev), GFP_KERNEL);
- if (!my_dev)
- return -ENOMEM;
- my_bus = kmalloc (sizeof (struct pci_bus), GFP_KERNEL);
- if (!my_bus) {
- kfree (my_dev);
- return -ENOMEM;
- }
- memset(my_dev, 0, sizeof(struct pci_dev));
- memset(my_bus, 0, sizeof(struct pci_bus));
- my_bus->number = bus;
- my_bus->ops = ops;
- my_dev->devfn = PCI_DEVFN(slot, function);
- my_dev->bus = my_bus;
- *pci_dev = my_dev;
- return 0;
- }
- /**
- * pci_read_config_byte_nodev - read a byte from a pci device
- * @ops: pointer to a &struct pci_ops that will be used to read from the pci device
- * @bus: the bus of the pci device to read from
- * @slot: the pci slot number of the pci device to read from
- * @function: the function of the pci device to read from
- * @where: the location on the pci address space to read from
- * @value: pointer to where to place the data read
- *
- * Like pci_read_config_byte() but works for pci devices that do not have a
- * pci_dev structure set up yet.
- * Returns 0 on success.
- */
- int pci_read_config_byte_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u8 *value)
- {
- struct pci_dev *dev = NULL;
- int result;
- dbg("%p, %d, %d, %d, %d, %pn", ops, bus, slot, function, where, value);
- dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
- if (dev) {
- dbg("using native pci_devn");
- return pci_read_config_byte (dev, where, value);
- }
-
- result = build_dev (ops, bus, slot, function, &dev);
- if (result)
- return result;
- result = pci_read_config_byte(dev, where, value);
- kfree (dev->bus);
- kfree (dev);
- return result;
- }
- /**
- * pci_read_config_word_nodev - read a word from a pci device
- * @ops: pointer to a &struct pci_ops that will be used to read from the pci device
- * @bus: the bus of the pci device to read from
- * @slot: the pci slot number of the pci device to read from
- * @function: the function of the pci device to read from
- * @where: the location on the pci address space to read from
- * @value: pointer to where to place the data read
- *
- * Like pci_read_config_word() but works for pci devices that do not have a
- * pci_dev structure set up yet.
- * Returns 0 on success.
- */
- int pci_read_config_word_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u16 *value)
- {
- struct pci_dev *dev = NULL;
- int result;
- dbg("%p, %d, %d, %d, %d, %pn", ops, bus, slot, function, where, value);
- dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
- if (dev) {
- dbg("using native pci_devn");
- return pci_read_config_word (dev, where, value);
- }
-
- result = build_dev (ops, bus, slot, function, &dev);
- if (result)
- return result;
- result = pci_read_config_word(dev, where, value);
- kfree (dev->bus);
- kfree (dev);
- return result;
- }
- /**
- * pci_read_config_dword_nodev - read a dword from a pci device
- * @ops: pointer to a &struct pci_ops that will be used to read from the pci
- * device
- * @bus: the bus of the pci device to read from
- * @slot: the pci slot number of the pci device to read from
- * @function: the function of the pci device to read from
- * @where: the location on the pci address space to read from
- * @value: pointer to where to place the data read
- *
- * Like pci_read_config_dword() but works for pci devices that do not have a
- * pci_dev structure set up yet.
- * Returns 0 on success.
- */
- int pci_read_config_dword_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u32 *value)
- {
- struct pci_dev *dev = NULL;
- int result;
- dbg("%p, %d, %d, %d, %d, %pn", ops, bus, slot, function, where, value);
- dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
- if (dev) {
- dbg("using native pci_devn");
- return pci_read_config_dword (dev, where, value);
- }
-
- result = build_dev (ops, bus, slot, function, &dev);
- if (result)
- return result;
- result = pci_read_config_dword(dev, where, value);
- kfree (dev->bus);
- kfree (dev);
- return result;
- }
- /**
- * pci_write_config_byte_nodev - write a byte to a pci device
- * @ops: pointer to a &struct pci_ops that will be used to write to the pci
- * device
- * @bus: the bus of the pci device to write to
- * @slot: the pci slot number of the pci device to write to
- * @function: the function of the pci device to write to
- * @where: the location on the pci address space to write to
- * @value: the value to write to the pci device
- *
- * Like pci_write_config_byte() but works for pci devices that do not have a
- * pci_dev structure set up yet.
- * Returns 0 on success.
- */
- int pci_write_config_byte_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u8 value)
- {
- struct pci_dev *dev = NULL;
- int result;
- dbg("%p, %d, %d, %d, %d, %dn", ops, bus, slot, function, where, value);
- dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
- if (dev) {
- dbg("using native pci_devn");
- return pci_write_config_byte (dev, where, value);
- }
-
- result = build_dev (ops, bus, slot, function, &dev);
- if (result)
- return result;
- result = pci_write_config_byte(dev, where, value);
- kfree (dev->bus);
- kfree (dev);
- return result;
- }
- /**
- * pci_write_config_word_nodev - write a word to a pci device
- * @ops: pointer to a &struct pci_ops that will be used to write to the pci
- * device
- * @bus: the bus of the pci device to write to
- * @slot: the pci slot number of the pci device to write to
- * @function: the function of the pci device to write to
- * @where: the location on the pci address space to write to
- * @value: the value to write to the pci device
- *
- * Like pci_write_config_word() but works for pci devices that do not have a
- * pci_dev structure set up yet.
- * Returns 0 on success.
- */
- int pci_write_config_word_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u16 value)
- {
- struct pci_dev *dev = NULL;
- int result;
- dbg("%p, %d, %d, %d, %d, %dn", ops, bus, slot, function, where, value);
- dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
- if (dev) {
- dbg("using native pci_devn");
- return pci_write_config_word (dev, where, value);
- }
-
- result = build_dev (ops, bus, slot, function, &dev);
- if (result)
- return result;
- result = pci_write_config_word(dev, where, value);
- kfree (dev->bus);
- kfree (dev);
- return result;
- }
- /**
- * pci_write_config_dword_nodev - write a dword to a pci device
- * @ops: pointer to a &struct pci_ops that will be used to write to the pci
- * device
- * @bus: the bus of the pci device to write to
- * @slot: the pci slot number of the pci device to write to
- * @function: the function of the pci device to write to
- * @where: the location on the pci address space to write to
- * @value: the value to write to the pci device
- *
- * Like pci_write_config_dword() but works for pci devices that do not have a
- * pci_dev structure set up yet.
- * Returns 0 on success.
- */
- int pci_write_config_dword_nodev (struct pci_ops *ops, u8 bus, u8 slot, u8 function, int where, u32 value)
- {
- struct pci_dev *dev = NULL;
- int result;
- dbg("%p, %d, %d, %d, %d, %dn", ops, bus, slot, function, where, value);
- dev = pci_find_slot(bus, PCI_DEVFN(slot, function));
- if (dev) {
- dbg("using native pci_devn");
- return pci_write_config_dword (dev, where, value);
- }
-
- result = build_dev (ops, bus, slot, function, &dev);
- if (result)
- return result;
- result = pci_write_config_dword(dev, where, value);
- kfree (dev->bus);
- kfree (dev);
- return result;
- }
- /*
- * This is code that scans the pci buses.
- * Every bus and every function is presented to a custom
- * function that can act upon it.
- */
- static int pci_visit_bus (struct pci_visit * fn, struct pci_bus_wrapped *wrapped_bus, struct pci_dev_wrapped *wrapped_parent)
- {
- struct list_head *ln;
- struct pci_dev *dev;
- struct pci_dev_wrapped wrapped_dev;
- int result = 0;
- dbg("scanning bus %02xn", wrapped_bus->bus->number);
- if (fn->pre_visit_pci_bus) {
- result = fn->pre_visit_pci_bus(wrapped_bus, wrapped_parent);
- if (result)
- return result;
- }
- ln = wrapped_bus->bus->devices.next;
- while (ln != &wrapped_bus->bus->devices) {
- dev = pci_dev_b(ln);
- ln = ln->next;
- memset(&wrapped_dev, 0, sizeof(struct pci_dev_wrapped));
- wrapped_dev.dev = dev;
- result = pci_visit_dev(fn, &wrapped_dev, wrapped_bus);
- if (result)
- return result;
- }
- if (fn->post_visit_pci_bus)
- result = fn->post_visit_pci_bus(wrapped_bus, wrapped_parent);
- return result;
- }
- static int pci_visit_bridge (struct pci_visit * fn, struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_parent)
- {
- struct pci_bus *bus = wrapped_dev->dev->subordinate;
- struct pci_bus_wrapped wrapped_bus;
- int result;
- memset(&wrapped_bus, 0, sizeof(struct pci_bus_wrapped));
- wrapped_bus.bus = bus;
- dbg("scanning bridge %02x, %02xn", wrapped_dev->dev->devfn >> 3,
- wrapped_dev->dev->devfn & 0x7);
- if (fn->visit_pci_dev) {
- result = fn->visit_pci_dev(wrapped_dev, wrapped_parent);
- if (result)
- return result;
- }
- result = pci_visit_bus(fn, &wrapped_bus, wrapped_dev);
- return result;
- }
- int pci_visit_dev (struct pci_visit *fn, struct pci_dev_wrapped *wrapped_dev, struct pci_bus_wrapped *wrapped_parent)
- {
- struct pci_dev* dev = wrapped_dev ? wrapped_dev->dev : NULL;
- int result = 0;
- if (!dev)
- return 0;
- if (fn->pre_visit_pci_dev) {
- result = fn->pre_visit_pci_dev(wrapped_dev, wrapped_parent);
- if (result)
- return result;
- }
- switch (dev->class >> 8) {
- case PCI_CLASS_BRIDGE_PCI:
- result = pci_visit_bridge(fn, wrapped_dev,
- wrapped_parent);
- if (result)
- return result;
- break;
- default:
- dbg("scanning device %02x, %02xn",
- PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
- if (fn->visit_pci_dev) {
- result = fn->visit_pci_dev (wrapped_dev,
- wrapped_parent);
- if (result)
- return result;
- }
- }
- if (fn->post_visit_pci_dev)
- result = fn->post_visit_pci_dev(wrapped_dev, wrapped_parent);
- return result;
- }
- EXPORT_SYMBOL(pci_visit_dev);
- EXPORT_SYMBOL(pci_read_config_byte_nodev);
- EXPORT_SYMBOL(pci_read_config_word_nodev);
- EXPORT_SYMBOL(pci_read_config_dword_nodev);
- EXPORT_SYMBOL(pci_write_config_byte_nodev);
- EXPORT_SYMBOL(pci_write_config_word_nodev);
- EXPORT_SYMBOL(pci_write_config_dword_nodev);