-/*
- * Fake PCI Hot Plug Controller Driver
+/* Works like the fakephp driver used to, except a little better.
*
- * 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>
+ * - It's possible to remove devices with subordinate busses.
+ * - New PCI devices that appear via any method, not just a fakephp triggered
+ * rescan, will be noticed.
+ * - Devices that are removed via any method, not just a fakephp triggered
+ * removal, will also be noticed.
*
- * Based on ideas and code from:
- * Vladimir Kondratiev <vladimir.kondratiev@intel.com>
- * Rolf Eike Beer <eike-kernel@sf-tec.de>
+ * Uses nothing from the pci-hotplug subsystem.
*
- * 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/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include "pci_hotplug.h"
+#include <linux/pci.h>
+#include <linux/device.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;
+struct legacy_slot {
+ struct kobject kobj;
+ struct pci_dev *dev;
+ struct list_head list;
};
-static int debug;
-static LIST_HEAD(slot_list);
+static LIST_HEAD(legacy_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)
+static ssize_t legacy_show(struct kobject *kobj, struct attribute *attr,
+ char *buf)
{
- struct dummy_slot *dslot = slot->private;
-
- list_del(&dslot->node);
- kfree(dslot->slot->info);
- kfree(dslot->slot);
- pci_dev_put(dslot->dev);
- kfree(dslot);
+ struct legacy_slot *slot = container_of(kobj, typeof(*slot), kobj);
+ strcpy(buf, "1\n");
+ return 2;
}
-static int add_slot(struct pci_dev *dev)
+static void remove_callback(void *data)
{
- 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;
+ pci_remove_bus_device((struct pci_dev *)data);
}
-static int __init pci_scan_buses(void)
+static ssize_t legacy_store(struct kobject *kobj, struct attribute *attr,
+ const char *buf, size_t len)
{
- 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;
+ struct legacy_slot *slot = container_of(kobj, typeof(*slot), kobj);
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val) < 0)
+ return -EINVAL;
+
+ if (val)
+ pci_rescan_bus(slot->dev->bus);
+ else
+ sysfs_schedule_callback(&slot->dev->dev.kobj, remove_callback,
+ slot->dev, THIS_MODULE);
+ return len;
}
-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);
-}
+static struct attribute *legacy_attrs[] = {
+ &(struct attribute){ .name = "power", .mode = 0644 },
+ NULL,
+};
-/**
- * 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)
+static void legacy_release(struct kobject *kobj)
{
- 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;
+ struct legacy_slot *slot = container_of(kobj, typeof(*slot), kobj);
- 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);
- }
- }
- }
- }
+ pci_dev_put(slot->dev);
+ kfree(slot);
}
+static struct kobj_type legacy_ktype = {
+ .sysfs_ops = &(struct sysfs_ops){
+ .store = legacy_store, .show = legacy_show
+ },
+ .release = &legacy_release,
+ .default_attrs = legacy_attrs,
+};
-/**
- * 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)
+static int legacy_add_slot(struct pci_dev *pdev)
{
- unsigned int devfn;
- struct pci_dev *dev;
- dev = kmalloc(sizeof(struct pci_dev), GFP_KERNEL);
- if (!dev)
- return;
+ struct legacy_slot *slot = kzalloc(sizeof(*slot), GFP_KERNEL);
- 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);
-}
+ if (!slot)
+ return -ENOMEM;
-/* 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);
+ if (kobject_init_and_add(&slot->kobj, &legacy_ktype,
+ &pci_slots_kset->kobj, "%s",
+ dev_name(&pdev->dev))) {
+ dev_warn(&pdev->dev, "Failed to created legacy fake slot\n");
+ return -EINVAL;
}
-}
-
-/* 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;
-}
+ slot->dev = pci_dev_get(pdev);
-/* 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_add(&slot->list, &legacy_list);
- list_for_each_entry(dslot, &slot_list, node) {
- if (dslot->dev == dev)
- return dslot->slot;
- }
- return NULL;
+ return 0;
}
-
-static int disable_slot(struct hotplug_slot *slot)
+static int legacy_notify(struct notifier_block *nb,
+ unsigned long action, void *data)
{
- struct dummy_slot *dslot;
- struct hotplug_slot *hslot;
- struct pci_dev *dev;
- int func;
+ struct pci_dev *pdev = to_pci_dev(data);
- if (!slot)
- return -ENODEV;
- dslot = slot->private;
+ if (action == BUS_NOTIFY_ADD_DEVICE) {
+ legacy_add_slot(pdev);
+ } else if (action == BUS_NOTIFY_DEL_DEVICE) {
+ struct legacy_slot *slot;
- dbg("%s - physical_slot = %s\n", __FUNCTION__, slot->name);
+ list_for_each_entry(slot, &legacy_list, list)
+ if (slot->dev == pdev)
+ goto found;
- /* 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");
+ dev_warn(&pdev->dev, "Missing legacy fake slot?");
return -ENODEV;
+found:
+ kobject_del(&slot->kobj);
+ list_del(&slot->list);
+ kobject_put(&slot->kobj);
}
- /* 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)
+static struct notifier_block legacy_notifier = {
+ .notifier_call = legacy_notify
+};
+
+static int __init init_legacy(void)
{
- struct list_head *tmp;
- struct list_head *next;
- struct dummy_slot *dslot;
+ struct pci_dev *pdev = NULL;
- list_for_each_safe (tmp, next, &slot_list) {
- dslot = list_entry (tmp, struct dummy_slot, node);
- remove_slot(dslot);
- }
-
+ /* Add existing devices */
+ while ((pdev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pdev)))
+ legacy_add_slot(pdev);
+
+ /* Be alerted of any new ones */
+ bus_register_notifier(&pci_bus_type, &legacy_notifier);
+ return 0;
}
+module_init(init_legacy);
-static int __init dummyphp_init(void)
+static void __exit remove_legacy(void)
{
- info(DRIVER_DESC "\n");
+ struct legacy_slot *slot, *tmp;
- return pci_scan_buses();
-}
+ bus_unregister_notifier(&pci_bus_type, &legacy_notifier);
-
-static void __exit dummyphp_exit(void)
-{
- cleanup_slots();
+ list_for_each_entry_safe(slot, tmp, &legacy_list, list) {
+ list_del(&slot->list);
+ kobject_del(&slot->kobj);
+ kobject_put(&slot->kobj);
+ }
}
+module_exit(remove_legacy);
-module_init(dummyphp_init);
-module_exit(dummyphp_exit);
-MODULE_AUTHOR(DRIVER_AUTHOR);
-MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_AUTHOR("Trent Piepho <xyzzy@speakeasy.org>");
+MODULE_DESCRIPTION("Legacy version of the fakephp interface");
MODULE_LICENSE("GPL");
-module_param(debug, bool, S_IRUGO | S_IWUSR);
-MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
-
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff