Initial import

1 files changed, 555 insertions, 0 deletions

diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
new file mode 100644
index 000000000..56d8486dc
--- /dev/null
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -0,0 +1,555 @@
+/*
+ * PCI HotPlug Controller Core
+ *
+ * Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
+ * Copyright (C) 2001-2002 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 <kristen.c.accardi@intel.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
+#include <linux/pagemap.h>
+#include <linux/init.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+#include <asm/uaccess.h>
+#include "../pci.h"
+#include "cpci_hotplug.h"
+
+#define MY_NAME	"pci_hotplug"
+
+#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## 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 bool debug;
+
+#define DRIVER_VERSION	"0.5"
+#define DRIVER_AUTHOR	"Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
+#define DRIVER_DESC	"PCI Hot Plug PCI Core"
+
+
+static LIST_HEAD(pci_hotplug_slot_list);
+static DEFINE_MUTEX(pci_hp_mutex);
+
+/* Weee, fun with macros... */
+#define GET_STATUS(name, type)	\
+static int get_##name(struct hotplug_slot *slot, type *value)		\
+{									\
+	struct hotplug_slot_ops *ops = slot->ops;			\
+	int retval = 0;							\
+	if (!try_module_get(ops->owner))				\
+		return -ENODEV;						\
+	if (ops->get_##name)						\
+		retval = ops->get_##name(slot, value);			\
+	else								\
+		*value = slot->info->name;				\
+	module_put(ops->owner);						\
+	return retval;							\
+}
+
+GET_STATUS(power_status, u8)
+GET_STATUS(attention_status, u8)
+GET_STATUS(latch_status, u8)
+GET_STATUS(adapter_status, u8)
+
+static ssize_t power_read_file(struct pci_slot *slot, char *buf)
+{
+	int retval;
+	u8 value;
+
+	retval = get_power_status(slot->hotplug, &value);
+	if (retval)
+		return retval;
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
+				size_t count)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+	unsigned long lpower;
+	u8 power;
+	int retval = 0;
+
+	lpower = simple_strtoul(buf, NULL, 10);
+	power = (u8)(lpower & 0xff);
+	dbg("power = %d\n", power);
+
+	if (!try_module_get(slot->ops->owner)) {
+		retval = -ENODEV;
+		goto exit;
+	}
+	switch (power) {
+	case 0:
+		if (slot->ops->disable_slot)
+			retval = slot->ops->disable_slot(slot);
+		break;
+
+	case 1:
+		if (slot->ops->enable_slot)
+			retval = slot->ops->enable_slot(slot);
+		break;
+
+	default:
+		err("Illegal value specified for power\n");
+		retval = -EINVAL;
+	}
+	module_put(slot->ops->owner);
+
+exit:
+	if (retval)
+		return retval;
+	return count;
+}
+
+static struct pci_slot_attribute hotplug_slot_attr_power = {
+	.attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+	.show = power_read_file,
+	.store = power_write_file
+};
+
+static ssize_t attention_read_file(struct pci_slot *slot, char *buf)
+{
+	int retval;
+	u8 value;
+
+	retval = get_attention_status(slot->hotplug, &value);
+	if (retval)
+		return retval;
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
+				    size_t count)
+{
+	struct hotplug_slot_ops *ops = slot->hotplug->ops;
+	unsigned long lattention;
+	u8 attention;
+	int retval = 0;
+
+	lattention = simple_strtoul(buf, NULL, 10);
+	attention = (u8)(lattention & 0xff);
+	dbg(" - attention = %d\n", attention);
+
+	if (!try_module_get(ops->owner)) {
+		retval = -ENODEV;
+		goto exit;
+	}
+	if (ops->set_attention_status)
+		retval = ops->set_attention_status(slot->hotplug, attention);
+	module_put(ops->owner);
+
+exit:
+	if (retval)
+		return retval;
+	return count;
+}
+
+static struct pci_slot_attribute hotplug_slot_attr_attention = {
+	.attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+	.show = attention_read_file,
+	.store = attention_write_file
+};
+
+static ssize_t latch_read_file(struct pci_slot *slot, char *buf)
+{
+	int retval;
+	u8 value;
+
+	retval = get_latch_status(slot->hotplug, &value);
+	if (retval)
+		return retval;
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static struct pci_slot_attribute hotplug_slot_attr_latch = {
+	.attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
+	.show = latch_read_file,
+};
+
+static ssize_t presence_read_file(struct pci_slot *slot, char *buf)
+{
+	int retval;
+	u8 value;
+
+	retval = get_adapter_status(slot->hotplug, &value);
+	if (retval)
+		return retval;
+
+	return sprintf(buf, "%d\n", value);
+}
+
+static struct pci_slot_attribute hotplug_slot_attr_presence = {
+	.attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
+	.show = presence_read_file,
+};
+
+static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
+			       size_t count)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+	unsigned long ltest;
+	u32 test;
+	int retval = 0;
+
+	ltest = simple_strtoul (buf, NULL, 10);
+	test = (u32)(ltest & 0xffffffff);
+	dbg("test = %d\n", test);
+
+	if (!try_module_get(slot->ops->owner)) {
+		retval = -ENODEV;
+		goto exit;
+	}
+	if (slot->ops->hardware_test)
+		retval = slot->ops->hardware_test(slot, test);
+	module_put(slot->ops->owner);
+
+exit:
+	if (retval)
+		return retval;
+	return count;
+}
+
+static struct pci_slot_attribute hotplug_slot_attr_test = {
+	.attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
+	.store = test_write_file
+};
+
+static bool has_power_file(struct pci_slot *pci_slot)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+
+	if ((!slot) || (!slot->ops))
+		return false;
+	if ((slot->ops->enable_slot) ||
+	    (slot->ops->disable_slot) ||
+	    (slot->ops->get_power_status))
+		return true;
+	return false;
+}
+
+static bool has_attention_file(struct pci_slot *pci_slot)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+
+	if ((!slot) || (!slot->ops))
+		return false;
+	if ((slot->ops->set_attention_status) ||
+	    (slot->ops->get_attention_status))
+		return true;
+	return false;
+}
+
+static bool has_latch_file(struct pci_slot *pci_slot)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+
+	if ((!slot) || (!slot->ops))
+		return false;
+	if (slot->ops->get_latch_status)
+		return true;
+	return false;
+}
+
+static bool has_adapter_file(struct pci_slot *pci_slot)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+
+	if ((!slot) || (!slot->ops))
+		return false;
+	if (slot->ops->get_adapter_status)
+		return true;
+	return false;
+}
+
+static bool has_test_file(struct pci_slot *pci_slot)
+{
+	struct hotplug_slot *slot = pci_slot->hotplug;
+
+	if ((!slot) || (!slot->ops))
+		return false;
+	if (slot->ops->hardware_test)
+		return true;
+	return false;
+}
+
+static int fs_add_slot(struct pci_slot *slot)
+{
+	int retval = 0;
+
+	/* Create symbolic link to the hotplug driver module */
+	pci_hp_create_module_link(slot);
+
+	if (has_power_file(slot)) {
+		retval = sysfs_create_file(&slot->kobj,
+					   &hotplug_slot_attr_power.attr);
+		if (retval)
+			goto exit_power;
+	}
+
+	if (has_attention_file(slot)) {
+		retval = sysfs_create_file(&slot->kobj,
+					   &hotplug_slot_attr_attention.attr);
+		if (retval)
+			goto exit_attention;
+	}
+
+	if (has_latch_file(slot)) {
+		retval = sysfs_create_file(&slot->kobj,
+					   &hotplug_slot_attr_latch.attr);
+		if (retval)
+			goto exit_latch;
+	}
+
+	if (has_adapter_file(slot)) {
+		retval = sysfs_create_file(&slot->kobj,
+					   &hotplug_slot_attr_presence.attr);
+		if (retval)
+			goto exit_adapter;
+	}
+
+	if (has_test_file(slot)) {
+		retval = sysfs_create_file(&slot->kobj,
+					   &hotplug_slot_attr_test.attr);
+		if (retval)
+			goto exit_test;
+	}
+
+	goto exit;
+
+exit_test:
+	if (has_adapter_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_presence.attr);
+exit_adapter:
+	if (has_latch_file(slot))
+		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
+exit_latch:
+	if (has_attention_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_attention.attr);
+exit_attention:
+	if (has_power_file(slot))
+		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
+exit_power:
+	pci_hp_remove_module_link(slot);
+exit:
+	return retval;
+}
+
+static void fs_remove_slot(struct pci_slot *slot)
+{
+	if (has_power_file(slot))
+		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
+
+	if (has_attention_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_attention.attr);
+
+	if (has_latch_file(slot))
+		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
+
+	if (has_adapter_file(slot))
+		sysfs_remove_file(&slot->kobj,
+				  &hotplug_slot_attr_presence.attr);
+
+	if (has_test_file(slot))
+		sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
+
+	pci_hp_remove_module_link(slot);
+}
+
+static struct hotplug_slot *get_slot_from_name(const char *name)
+{
+	struct hotplug_slot *slot;
+	struct list_head *tmp;
+
+	list_for_each(tmp, &pci_hotplug_slot_list) {
+		slot = list_entry(tmp, struct hotplug_slot, slot_list);
+		if (strcmp(hotplug_slot_name(slot), name) == 0)
+			return slot;
+	}
+	return NULL;
+}
+
+/**
+ * __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
+ * @bus: bus this slot is on
+ * @slot: pointer to the &struct hotplug_slot to register
+ * @devnr: device number
+ * @name: name registered with kobject core
+ * @owner: caller module owner
+ * @mod_name: caller module name
+ *
+ * Registers a hotplug slot with the pci hotplug subsystem, which will allow
+ * userspace interaction to the slot.
+ *
+ * Returns 0 if successful, anything else for an error.
+ */
+int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
+		      int devnr, const char *name,
+		      struct module *owner, const char *mod_name)
+{
+	int result;
+	struct pci_slot *pci_slot;
+
+	if (slot == NULL)
+		return -ENODEV;
+	if ((slot->info == NULL) || (slot->ops == NULL))
+		return -EINVAL;
+	if (slot->release == NULL) {
+		dbg("Why are you trying to register a hotplug slot without a proper release function?\n");
+		return -EINVAL;
+	}
+
+	slot->ops->owner = owner;
+	slot->ops->mod_name = mod_name;
+
+	mutex_lock(&pci_hp_mutex);
+	/*
+	 * No problems if we call this interface from both ACPI_PCI_SLOT
+	 * driver and call it here again. If we've already created the
+	 * pci_slot, the interface will simply bump the refcount.
+	 */
+	pci_slot = pci_create_slot(bus, devnr, name, slot);
+	if (IS_ERR(pci_slot)) {
+		result = PTR_ERR(pci_slot);
+		goto out;
+	}
+
+	slot->pci_slot = pci_slot;
+	pci_slot->hotplug = slot;
+
+	list_add(&slot->slot_list, &pci_hotplug_slot_list);
+
+	result = fs_add_slot(pci_slot);
+	kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
+	dbg("Added slot %s to the list\n", name);
+out:
+	mutex_unlock(&pci_hp_mutex);
+	return result;
+}
+EXPORT_SYMBOL_GPL(__pci_hp_register);
+
+/**
+ * pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
+ * @hotplug: pointer to the &struct hotplug_slot to deregister
+ *
+ * The @slot must have been registered with the pci hotplug subsystem
+ * previously with a call to pci_hp_register().
+ *
+ * Returns 0 if successful, anything else for an error.
+ */
+int pci_hp_deregister(struct hotplug_slot *hotplug)
+{
+	struct hotplug_slot *temp;
+	struct pci_slot *slot;
+
+	if (!hotplug)
+		return -ENODEV;
+
+	mutex_lock(&pci_hp_mutex);
+	temp = get_slot_from_name(hotplug_slot_name(hotplug));
+	if (temp != hotplug) {
+		mutex_unlock(&pci_hp_mutex);
+		return -ENODEV;
+	}
+
+	list_del(&hotplug->slot_list);
+
+	slot = hotplug->pci_slot;
+	fs_remove_slot(slot);
+	dbg("Removed slot %s from the list\n", hotplug_slot_name(hotplug));
+
+	hotplug->release(hotplug);
+	slot->hotplug = NULL;
+	pci_destroy_slot(slot);
+	mutex_unlock(&pci_hp_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_hp_deregister);
+
+/**
+ * pci_hp_change_slot_info - changes the slot's information structure in the core
+ * @hotplug: pointer to the slot whose info has changed
+ * @info: pointer to the info copy into the slot's info structure
+ *
+ * @slot must have been registered with the pci
+ * hotplug subsystem previously with a call to pci_hp_register().
+ *
+ * Returns 0 if successful, anything else for an error.
+ */
+int pci_hp_change_slot_info(struct hotplug_slot *hotplug,
+			    struct hotplug_slot_info *info)
+{
+	if (!hotplug || !info)
+		return -ENODEV;
+
+	memcpy(hotplug->info, info, sizeof(struct hotplug_slot_info));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
+
+static int __init pci_hotplug_init(void)
+{
+	int result;
+
+	result = cpci_hotplug_init(debug);
+	if (result) {
+		err("cpci_hotplug_init with error %d\n", result);
+		return result;
+	}
+
+	info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+	return result;
+}
+
+static void __exit pci_hotplug_exit(void)
+{
+	cpci_hotplug_exit();
+}
+
+module_init(pci_hotplug_init);
+module_exit(pci_hotplug_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debugging mode enabled or not");