Linux-2.6.12-rc2

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!

1 files changed, 358 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
new file mode 100644
index 00000000000..8e47fa66e25
--- /dev/null
+++ b/drivers/pci/hotplug/fakephp.c
@@ -0,0 +1,358 @@
+/*
+ * 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");
+