1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
358 lines
8.1 KiB
C
358 lines
8.1 KiB
C
/*
|
|
* Fake PCI Hot Plug Controller Driver
|
|
*
|
|
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
|
|
* Copyright (C) 2003 IBM Corp.
|
|
* Copyright (C) 2003 Rolf Eike Beer <eike-kernel@sf-tec.de>
|
|
*
|
|
* Based on ideas and code from:
|
|
* Vladimir Kondratiev <vladimir.kondratiev@intel.com>
|
|
* Rolf Eike Beer <eike-kernel@sf-tec.de>
|
|
*
|
|
* 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, version 2 of the License.
|
|
*
|
|
* Send feedback to <greg@kroah.com>
|
|
*/
|
|
|
|
/*
|
|
*
|
|
* This driver will "emulate" removing PCI devices from the system. If
|
|
* the "power" file is written to with "0" then the specified PCI device
|
|
* will be completely removed from the kernel.
|
|
*
|
|
* WARNING, this does NOT turn off the power to the PCI device. This is
|
|
* a "logical" removal, not a physical or electrical removal.
|
|
*
|
|
* Use this module at your own risk, you have been warned!
|
|
*
|
|
* Enabling PCI devices is left as an exercise for the reader...
|
|
*
|
|
*/
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/init.h>
|
|
#include "pci_hotplug.h"
|
|
#include "../pci.h"
|
|
|
|
#if !defined(MODULE)
|
|
#define MY_NAME "fakephp"
|
|
#else
|
|
#define MY_NAME THIS_MODULE->name
|
|
#endif
|
|
|
|
#define dbg(format, arg...) \
|
|
do { \
|
|
if (debug) \
|
|
printk(KERN_DEBUG "%s: " format, \
|
|
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 DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
|
|
#define DRIVER_DESC "Fake PCI Hot Plug Controller Driver"
|
|
|
|
struct dummy_slot {
|
|
struct list_head node;
|
|
struct hotplug_slot *slot;
|
|
struct pci_dev *dev;
|
|
};
|
|
|
|
static int debug;
|
|
static LIST_HEAD(slot_list);
|
|
|
|
static int enable_slot (struct hotplug_slot *slot);
|
|
static int disable_slot (struct hotplug_slot *slot);
|
|
|
|
static struct hotplug_slot_ops dummy_hotplug_slot_ops = {
|
|
.owner = THIS_MODULE,
|
|
.enable_slot = enable_slot,
|
|
.disable_slot = disable_slot,
|
|
};
|
|
|
|
static void dummy_release(struct hotplug_slot *slot)
|
|
{
|
|
struct dummy_slot *dslot = slot->private;
|
|
|
|
list_del(&dslot->node);
|
|
kfree(dslot->slot->info);
|
|
kfree(dslot->slot);
|
|
pci_dev_put(dslot->dev);
|
|
kfree(dslot);
|
|
}
|
|
|
|
static int add_slot(struct pci_dev *dev)
|
|
{
|
|
struct dummy_slot *dslot;
|
|
struct hotplug_slot *slot;
|
|
int retval = -ENOMEM;
|
|
|
|
slot = kmalloc(sizeof(struct hotplug_slot), GFP_KERNEL);
|
|
if (!slot)
|
|
goto error;
|
|
memset(slot, 0, sizeof(*slot));
|
|
|
|
slot->info = kmalloc(sizeof(struct hotplug_slot_info), GFP_KERNEL);
|
|
if (!slot->info)
|
|
goto error_slot;
|
|
memset(slot->info, 0, sizeof(struct hotplug_slot_info));
|
|
|
|
slot->info->power_status = 1;
|
|
slot->info->max_bus_speed = PCI_SPEED_UNKNOWN;
|
|
slot->info->cur_bus_speed = PCI_SPEED_UNKNOWN;
|
|
|
|
slot->name = &dev->dev.bus_id[0];
|
|
dbg("slot->name = %s\n", slot->name);
|
|
|
|
dslot = kmalloc(sizeof(struct dummy_slot), GFP_KERNEL);
|
|
if (!dslot)
|
|
goto error_info;
|
|
|
|
slot->ops = &dummy_hotplug_slot_ops;
|
|
slot->release = &dummy_release;
|
|
slot->private = dslot;
|
|
|
|
retval = pci_hp_register(slot);
|
|
if (retval) {
|
|
err("pci_hp_register failed with error %d\n", retval);
|
|
goto error_dslot;
|
|
}
|
|
|
|
dslot->slot = slot;
|
|
dslot->dev = pci_dev_get(dev);
|
|
list_add (&dslot->node, &slot_list);
|
|
return retval;
|
|
|
|
error_dslot:
|
|
kfree(dslot);
|
|
error_info:
|
|
kfree(slot->info);
|
|
error_slot:
|
|
kfree(slot);
|
|
error:
|
|
return retval;
|
|
}
|
|
|
|
static int __init pci_scan_buses(void)
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
int retval = 0;
|
|
|
|
while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
|
|
retval = add_slot(dev);
|
|
if (retval) {
|
|
pci_dev_put(dev);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
static void remove_slot(struct dummy_slot *dslot)
|
|
{
|
|
int retval;
|
|
|
|
dbg("removing slot %s\n", dslot->slot->name);
|
|
retval = pci_hp_deregister(dslot->slot);
|
|
if (retval)
|
|
err("Problem unregistering a slot %s\n", dslot->slot->name);
|
|
}
|
|
|
|
/**
|
|
* Rescan slot.
|
|
* Tries hard not to re-enable already existing devices
|
|
* also handles scanning of subfunctions
|
|
*
|
|
* @param temp Device template. Should be set: bus and devfn.
|
|
*/
|
|
static void pci_rescan_slot(struct pci_dev *temp)
|
|
{
|
|
struct pci_bus *bus = temp->bus;
|
|
struct pci_dev *dev;
|
|
int func;
|
|
u8 hdr_type;
|
|
if (!pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type)) {
|
|
temp->hdr_type = hdr_type & 0x7f;
|
|
if (!pci_find_slot(bus->number, temp->devfn)) {
|
|
dev = pci_scan_single_device(bus, temp->devfn);
|
|
if (dev) {
|
|
dbg("New device on %s function %x:%x\n",
|
|
bus->name, temp->devfn >> 3,
|
|
temp->devfn & 7);
|
|
pci_bus_add_device(dev);
|
|
add_slot(dev);
|
|
}
|
|
}
|
|
/* multifunction device? */
|
|
if (!(hdr_type & 0x80))
|
|
return;
|
|
|
|
/* continue scanning for other functions */
|
|
for (func = 1, temp->devfn++; func < 8; func++, temp->devfn++) {
|
|
if (pci_read_config_byte(temp, PCI_HEADER_TYPE, &hdr_type))
|
|
continue;
|
|
temp->hdr_type = hdr_type & 0x7f;
|
|
|
|
if (!pci_find_slot(bus->number, temp->devfn)) {
|
|
dev = pci_scan_single_device(bus, temp->devfn);
|
|
if (dev) {
|
|
dbg("New device on %s function %x:%x\n",
|
|
bus->name, temp->devfn >> 3,
|
|
temp->devfn & 7);
|
|
pci_bus_add_device(dev);
|
|
add_slot(dev);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* Rescan PCI bus.
|
|
* call pci_rescan_slot for each possible function of the bus
|
|
*
|
|
* @param bus
|
|
*/
|
|
static void pci_rescan_bus(const struct pci_bus *bus)
|
|
{
|
|
unsigned int devfn;
|
|
struct pci_dev *dev;
|
|
dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
|
|
if (!dev)
|
|
return;
|
|
|
|
memset(dev, 0, sizeof(dev));
|
|
dev->bus = (struct pci_bus*)bus;
|
|
dev->sysdata = bus->sysdata;
|
|
for (devfn = 0; devfn < 0x100; devfn += 8) {
|
|
dev->devfn = devfn;
|
|
pci_rescan_slot(dev);
|
|
}
|
|
kfree(dev);
|
|
}
|
|
|
|
/* recursively scan all buses */
|
|
static void pci_rescan_buses(const struct list_head *list)
|
|
{
|
|
const struct list_head *l;
|
|
list_for_each(l,list) {
|
|
const struct pci_bus *b = pci_bus_b(l);
|
|
pci_rescan_bus(b);
|
|
pci_rescan_buses(&b->children);
|
|
}
|
|
}
|
|
|
|
/* initiate rescan of all pci buses */
|
|
static inline void pci_rescan(void) {
|
|
pci_rescan_buses(&pci_root_buses);
|
|
}
|
|
|
|
|
|
static int enable_slot(struct hotplug_slot *hotplug_slot)
|
|
{
|
|
/* mis-use enable_slot for rescanning of the pci bus */
|
|
pci_rescan();
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* find the hotplug_slot for the pci_dev */
|
|
static struct hotplug_slot *get_slot_from_dev(struct pci_dev *dev)
|
|
{
|
|
struct dummy_slot *dslot;
|
|
|
|
list_for_each_entry(dslot, &slot_list, node) {
|
|
if (dslot->dev == dev)
|
|
return dslot->slot;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static int disable_slot(struct hotplug_slot *slot)
|
|
{
|
|
struct dummy_slot *dslot;
|
|
struct hotplug_slot *hslot;
|
|
struct pci_dev *dev;
|
|
int func;
|
|
|
|
if (!slot)
|
|
return -ENODEV;
|
|
dslot = slot->private;
|
|
|
|
dbg("%s - physical_slot = %s\n", __FUNCTION__, slot->name);
|
|
|
|
/* don't disable bridged devices just yet, we can't handle them easily... */
|
|
if (dslot->dev->subordinate) {
|
|
err("Can't remove PCI devices with other PCI devices behind it yet.\n");
|
|
return -ENODEV;
|
|
}
|
|
/* search for subfunctions and disable them first */
|
|
if (!(dslot->dev->devfn & 7)) {
|
|
for (func = 1; func < 8; func++) {
|
|
dev = pci_find_slot(dslot->dev->bus->number,
|
|
dslot->dev->devfn + func);
|
|
if (dev) {
|
|
hslot = get_slot_from_dev(dev);
|
|
if (hslot)
|
|
disable_slot(hslot);
|
|
else {
|
|
err("Hotplug slot not found for subfunction of PCI device\n");
|
|
return -ENODEV;
|
|
}
|
|
} else
|
|
dbg("No device in slot found\n");
|
|
}
|
|
}
|
|
|
|
/* remove the device from the pci core */
|
|
pci_remove_bus_device(dslot->dev);
|
|
|
|
/* blow away this sysfs entry and other parts. */
|
|
remove_slot(dslot);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void cleanup_slots (void)
|
|
{
|
|
struct list_head *tmp;
|
|
struct list_head *next;
|
|
struct dummy_slot *dslot;
|
|
|
|
list_for_each_safe (tmp, next, &slot_list) {
|
|
dslot = list_entry (tmp, struct dummy_slot, node);
|
|
remove_slot(dslot);
|
|
}
|
|
|
|
}
|
|
|
|
static int __init dummyphp_init(void)
|
|
{
|
|
info(DRIVER_DESC "\n");
|
|
|
|
return pci_scan_buses();
|
|
}
|
|
|
|
|
|
static void __exit dummyphp_exit(void)
|
|
{
|
|
cleanup_slots();
|
|
}
|
|
|
|
module_init(dummyphp_init);
|
|
module_exit(dummyphp_exit);
|
|
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
module_param(debug, bool, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
|
|
|