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linux-sg2042/drivers/pci/hotplug/pci_hotplug_core.c

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/*
* 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/slab.h>
#include <linux/init.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/uaccess.h>
#define MY_NAME "pci_hotplug"
#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __FUNCTION__ , ## 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 int 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);
struct kset *pci_hotplug_slots_kset;
static ssize_t hotplug_slot_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct hotplug_slot *slot = to_hotplug_slot(kobj);
struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
return attribute->show ? attribute->show(slot, buf) : -EIO;
}
static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
struct attribute *attr, const char *buf, size_t len)
{
struct hotplug_slot *slot = to_hotplug_slot(kobj);
struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
return attribute->store ? attribute->store(slot, buf, len) : -EIO;
}
static struct sysfs_ops hotplug_slot_sysfs_ops = {
.show = hotplug_slot_attr_show,
.store = hotplug_slot_attr_store,
};
static void hotplug_slot_release(struct kobject *kobj)
{
struct hotplug_slot *slot = to_hotplug_slot(kobj);
if (slot->release)
slot->release(slot);
}
static struct kobj_type hotplug_slot_ktype = {
.sysfs_ops = &hotplug_slot_sysfs_ops,
.release = &hotplug_slot_release,
};
/* these strings match up with the values in pci_bus_speed */
static char *pci_bus_speed_strings[] = {
"33 MHz PCI", /* 0x00 */
"66 MHz PCI", /* 0x01 */
"66 MHz PCIX", /* 0x02 */
"100 MHz PCIX", /* 0x03 */
"133 MHz PCIX", /* 0x04 */
NULL, /* 0x05 */
NULL, /* 0x06 */
NULL, /* 0x07 */
NULL, /* 0x08 */
"66 MHz PCIX 266", /* 0x09 */
"100 MHz PCIX 266", /* 0x0a */
"133 MHz PCIX 266", /* 0x0b */
NULL, /* 0x0c */
NULL, /* 0x0d */
NULL, /* 0x0e */
NULL, /* 0x0f */
NULL, /* 0x10 */
"66 MHz PCIX 533", /* 0x11 */
"100 MHz PCIX 533", /* 0x12 */
"133 MHz PCIX 533", /* 0x13 */
"25 GBps PCI-E", /* 0x14 */
};
#ifdef CONFIG_HOTPLUG_PCI_CPCI
extern int cpci_hotplug_init(int debug);
extern void cpci_hotplug_exit(void);
#else
static inline int cpci_hotplug_init(int debug) { return 0; }
static inline void cpci_hotplug_exit(void) { }
#endif
/* 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)) { \
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)
GET_STATUS(address, u32)
GET_STATUS(max_bus_speed, enum pci_bus_speed)
GET_STATUS(cur_bus_speed, enum pci_bus_speed)
static ssize_t power_read_file (struct hotplug_slot *slot, char *buf)
{
int retval;
u8 value;
retval = get_power_status (slot, &value);
if (retval)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
static ssize_t power_write_file (struct hotplug_slot *slot, const char *buf,
size_t count)
{
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 hotplug_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 hotplug_slot *slot, char *buf)
{
int retval;
u8 value;
retval = get_attention_status (slot, &value);
if (retval)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
static ssize_t attention_write_file (struct hotplug_slot *slot, const char *buf,
size_t count)
{
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(slot->ops->owner)) {
retval = -ENODEV;
goto exit;
}
if (slot->ops->set_attention_status)
retval = slot->ops->set_attention_status(slot, attention);
module_put(slot->ops->owner);
exit:
if (retval)
return retval;
return count;
}
static struct hotplug_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 hotplug_slot *slot, char *buf)
{
int retval;
u8 value;
retval = get_latch_status (slot, &value);
if (retval)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
static struct hotplug_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 hotplug_slot *slot, char *buf)
{
int retval;
u8 value;
retval = get_adapter_status (slot, &value);
if (retval)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
static struct hotplug_slot_attribute hotplug_slot_attr_presence = {
.attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
.show = presence_read_file,
};
static ssize_t address_read_file (struct hotplug_slot *slot, char *buf)
{
int retval;
u32 address;
retval = get_address (slot, &address);
if (retval)
goto exit;
retval = sprintf (buf, "%04x:%02x:%02x\n",
(address >> 16) & 0xffff,
(address >> 8) & 0xff,
address & 0xff);
exit:
return retval;
}
static struct hotplug_slot_attribute hotplug_slot_attr_address = {
.attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
.show = address_read_file,
};
static char *unknown_speed = "Unknown bus speed";
static ssize_t max_bus_speed_read_file (struct hotplug_slot *slot, char *buf)
{
char *speed_string;
int retval;
enum pci_bus_speed value;
retval = get_max_bus_speed (slot, &value);
if (retval)
goto exit;
if (value == PCI_SPEED_UNKNOWN)
speed_string = unknown_speed;
else
speed_string = pci_bus_speed_strings[value];
retval = sprintf (buf, "%s\n", speed_string);
exit:
return retval;
}
static struct hotplug_slot_attribute hotplug_slot_attr_max_bus_speed = {
.attr = {.name = "max_bus_speed", .mode = S_IFREG | S_IRUGO},
.show = max_bus_speed_read_file,
};
static ssize_t cur_bus_speed_read_file (struct hotplug_slot *slot, char *buf)
{
char *speed_string;
int retval;
enum pci_bus_speed value;
retval = get_cur_bus_speed (slot, &value);
if (retval)
goto exit;
if (value == PCI_SPEED_UNKNOWN)
speed_string = unknown_speed;
else
speed_string = pci_bus_speed_strings[value];
retval = sprintf (buf, "%s\n", speed_string);
exit:
return retval;
}
static struct hotplug_slot_attribute hotplug_slot_attr_cur_bus_speed = {
.attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO},
.show = cur_bus_speed_read_file,
};
static ssize_t test_write_file (struct hotplug_slot *slot, const char *buf,
size_t count)
{
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 hotplug_slot_attribute hotplug_slot_attr_test = {
.attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
.store = test_write_file
};
static int has_power_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if ((slot->ops->enable_slot) ||
(slot->ops->disable_slot) ||
(slot->ops->get_power_status))
return 0;
return -ENOENT;
}
static int has_attention_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if ((slot->ops->set_attention_status) ||
(slot->ops->get_attention_status))
return 0;
return -ENOENT;
}
static int has_latch_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_latch_status)
return 0;
return -ENOENT;
}
static int has_adapter_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_adapter_status)
return 0;
return -ENOENT;
}
static int has_address_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_address)
return 0;
return -ENOENT;
}
static int has_max_bus_speed_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_max_bus_speed)
return 0;
return -ENOENT;
}
static int has_cur_bus_speed_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_cur_bus_speed)
return 0;
return -ENOENT;
}
static int has_test_file (struct hotplug_slot *slot)
{
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->hardware_test)
return 0;
return -ENOENT;
}
static int fs_add_slot (struct hotplug_slot *slot)
{
int retval = 0;
if (has_power_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);
if (retval)
goto exit_power;
}
if (has_attention_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_attention.attr);
if (retval)
goto exit_attention;
}
if (has_latch_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_latch.attr);
if (retval)
goto exit_latch;
}
if (has_adapter_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_presence.attr);
if (retval)
goto exit_adapter;
}
if (has_address_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_address.attr);
if (retval)
goto exit_address;
}
if (has_max_bus_speed_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_max_bus_speed.attr);
if (retval)
goto exit_max_speed;
}
if (has_cur_bus_speed_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_cur_bus_speed.attr);
if (retval)
goto exit_cur_speed;
}
if (has_test_file(slot) == 0) {
retval = sysfs_create_file(&slot->kobj,
&hotplug_slot_attr_test.attr);
if (retval)
goto exit_test;
}
goto exit;
exit_test:
if (has_cur_bus_speed_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
exit_cur_speed:
if (has_max_bus_speed_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
exit_max_speed:
if (has_address_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_address.attr);
exit_address:
if (has_adapter_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
exit_adapter:
if (has_latch_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
exit_latch:
if (has_attention_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
exit_attention:
if (has_power_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
exit_power:
exit:
return retval;
}
static void fs_remove_slot (struct hotplug_slot *slot)
{
if (has_power_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
if (has_attention_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
if (has_latch_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
if (has_adapter_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
if (has_address_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_address.attr);
if (has_max_bus_speed_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
if (has_cur_bus_speed_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
if (has_test_file(slot) == 0)
sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
}
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(slot->name, name) == 0)
return slot;
}
return NULL;
}
/**
* pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
* @slot: pointer to the &struct hotplug_slot to register
*
* 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)
{
int result;
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;
}
/* this can fail if we have already registered a slot with the same name */
slot->kobj.kset = pci_hotplug_slots_kset;
result = kobject_init_and_add(&slot->kobj, &hotplug_slot_ktype, NULL,
"%s", slot->name);
if (result) {
err("Unable to register kobject '%s'", slot->name);
return -EINVAL;
}
list_add (&slot->slot_list, &pci_hotplug_slot_list);
result = fs_add_slot (slot);
kobject_uevent(&slot->kobj, KOBJ_ADD);
dbg ("Added slot %s to the list\n", slot->name);
return result;
}
/**
* pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
* @slot: 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 *slot)
{
struct hotplug_slot *temp;
if (slot == NULL)
return -ENODEV;
temp = get_slot_from_name (slot->name);
if (temp != slot) {
return -ENODEV;
}
list_del (&slot->slot_list);
fs_remove_slot (slot);
dbg ("Removed slot %s from the list\n", slot->name);
kobject_put(&slot->kobj);
return 0;
}
/**
* pci_hp_change_slot_info - changes the slot's information structure in the core
* @slot: 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 __must_check pci_hp_change_slot_info(struct hotplug_slot *slot,
struct hotplug_slot_info *info)
{
if ((slot == NULL) || (info == NULL))
return -ENODEV;
memcpy (slot->info, info, sizeof (struct hotplug_slot_info));
return 0;
}
static int __init pci_hotplug_init (void)
{
int result;
struct kset *pci_bus_kset;
pci_bus_kset = bus_get_kset(&pci_bus_type);
pci_hotplug_slots_kset = kset_create_and_add("slots", NULL,
&pci_bus_kset->kobj);
if (!pci_hotplug_slots_kset) {
result = -ENOMEM;
err("Register subsys error\n");
goto exit;
}
result = cpci_hotplug_init(debug);
if (result) {
err ("cpci_hotplug_init with error %d\n", result);
goto err_subsys;
}
info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
goto exit;
err_subsys:
kset_unregister(pci_hotplug_slots_kset);
exit:
return result;
}
static void __exit pci_hotplug_exit (void)
{
cpci_hotplug_exit();
kset_unregister(pci_hotplug_slots_kset);
}
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");
EXPORT_SYMBOL_GPL(pci_hotplug_slots_kset);
EXPORT_SYMBOL_GPL(pci_hp_register);
EXPORT_SYMBOL_GPL(pci_hp_deregister);
EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
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