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SubjectRe: [PATCH] More PCI fixes for 2.5.73
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Date
ChangeSet 1.1429.2.8, 2003/06/25 17:24:47-07:00, greg@kroah.com

PCI Hotplug: add fake PCI hotplug driver.

Useful for testing hotplug issues with pci drivers.


drivers/pci/hotplug/Kconfig | 25 ++++
drivers/pci/hotplug/Makefile | 1
drivers/pci/hotplug/fakephp.c | 232 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 258 insertions(+)

diff -Nru a/drivers/pci/hotplug/Kconfig b/drivers/pci/hotplug/Kconfig
--- a/drivers/pci/hotplug/Kconfig Wed Jun 25 17:37:39 2003
+++ b/drivers/pci/hotplug/Kconfig Wed Jun 25 17:37:39 2003
@@ -21,6 +21,31 @@

When in doubt, say N.

+config HOTPLUG_PCI_FAKE
+ tristate "Fake PCI Hotplug driver"
+ depends on HOTPLUG_PCI
+ help
+ Say Y here if you want to use the fake PCI hotplug driver. It can
+ be used to simulate PCI hotplug events if even if your system is
+ not PCI hotplug capable.
+
+ 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!
+
+ This code is also available as a module ( = code which can be
+ inserted in and removed from the running kernel whenever you want).
+ The module will be called fakephp. If you want to compile it
+ as a module, say M here and read <file:Documentation/modules.txt>.
+
+ When in doubt, say N.
+
config HOTPLUG_PCI_COMPAQ
tristate "Compaq PCI Hotplug driver"
depends on HOTPLUG_PCI && X86
diff -Nru a/drivers/pci/hotplug/Makefile b/drivers/pci/hotplug/Makefile
--- a/drivers/pci/hotplug/Makefile Wed Jun 25 17:37:39 2003
+++ b/drivers/pci/hotplug/Makefile Wed Jun 25 17:37:39 2003
@@ -3,6 +3,7 @@
#

obj-$(CONFIG_HOTPLUG_PCI) += pci_hotplug.o
+obj-$(CONFIG_HOTPLUG_PCI_FAKE) += fakephp.o
obj-$(CONFIG_HOTPLUG_PCI_COMPAQ) += cpqphp.o
obj-$(CONFIG_HOTPLUG_PCI_IBM) += ibmphp.o
obj-$(CONFIG_HOTPLUG_PCI_ACPI) += acpiphp.o
diff -Nru a/drivers/pci/hotplug/fakephp.c b/drivers/pci/hotplug/fakephp.c
--- /dev/null Wed Dec 31 16:00:00 1969
+++ b/drivers/pci/hotplug/fakephp.c Wed Jun 25 17:37:39 2003
@@ -0,0 +1,232 @@
+/*
+ * 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(CONFIG_HOTPLUG_PCI_FAKE_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);
+}
+
+static int enable_slot(struct hotplug_slot *hotplug_slot)
+{
+ return -ENODEV;
+}
+
+static int disable_slot(struct hotplug_slot *slot)
+{
+ struct dummy_slot *dslot;
+
+ 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;
+ }
+
+ /* 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_PARM(debug, "i");
+MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
+
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