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linux/drivers/pci/hotplug/pci_hotplug_core.c
Kenji Kaneshige b86ec7ed28 Remove unnecessary 'tmp' variable from pci_hp_register(). 
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-06-25 15:58:39 -07:00

708 lines
17 KiB
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>
#include "../pci.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 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);
static DEFINE_SPINLOCK(pci_hotplug_slot_list_lock);
/* 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(max_bus_speed, enum pci_bus_speed)
GET_STATUS(cur_bus_speed, enum pci_bus_speed)
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)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
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)
goto exit;
retval = sprintf(buf, "%d\n", value);
exit:
return retval;
}
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)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
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)
goto exit;
retval = sprintf (buf, "%d\n", value);
exit:
return retval;
}
static struct pci_slot_attribute hotplug_slot_attr_presence = {
.attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
.show = presence_read_file,
};
static char *unknown_speed = "Unknown bus speed";
static ssize_t max_bus_speed_read_file(struct pci_slot *slot, char *buf)
{
char *speed_string;
int retval;
enum pci_bus_speed value;
retval = get_max_bus_speed(slot->hotplug, &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 pci_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 pci_slot *slot, char *buf)
{
char *speed_string;
int retval;
enum pci_bus_speed value;
retval = get_cur_bus_speed(slot->hotplug, &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 pci_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 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 int has_power_file(struct pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
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 pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
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 pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_latch_status)
return 0;
return -ENOENT;
}
static int has_adapter_file(struct pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_adapter_status)
return 0;
return -ENOENT;
}
static int has_max_bus_speed_file(struct pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
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 pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->get_cur_bus_speed)
return 0;
return -ENOENT;
}
static int has_test_file(struct pci_slot *pci_slot)
{
struct hotplug_slot *slot = pci_slot->hotplug;
if ((!slot) || (!slot->ops))
return -ENODEV;
if (slot->ops->hardware_test)
return 0;
return -ENOENT;
}
static int fs_add_slot(struct pci_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_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_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 pci_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_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;
spin_lock(&pci_hotplug_slot_list_lock);
list_for_each (tmp, &pci_hotplug_slot_list) {
slot = list_entry (tmp, struct hotplug_slot, slot_list);
if (strcmp(slot->name, name) == 0)
goto out;
}
slot = NULL;
out:
spin_unlock(&pci_hotplug_slot_list_lock);
return slot;
}
/**
* 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
* @slot_nr: slot number
*
* 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 slot_nr)
{
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;
}
/* Check if we have already registered a slot with the same name. */
if (get_slot_from_name(slot->name))
return -EEXIST;
/*
* 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, slot_nr, slot->name);
if (IS_ERR(pci_slot))
return PTR_ERR(pci_slot);
if (pci_slot->hotplug) {
dbg("%s: already claimed\n", __func__);
pci_destroy_slot(pci_slot);
return -EBUSY;
}
slot->pci_slot = pci_slot;
pci_slot->hotplug = slot;
/*
* Allow pcihp drivers to override the ACPI_PCI_SLOT name.
*/
if (strcmp(kobject_name(&pci_slot->kobj), slot->name)) {
result = kobject_rename(&pci_slot->kobj, slot->name);
if (result) {
pci_destroy_slot(pci_slot);
return result;
}
}
spin_lock(&pci_hotplug_slot_list_lock);
list_add(&slot->slot_list, &pci_hotplug_slot_list);
spin_unlock(&pci_hotplug_slot_list_lock);
result = fs_add_slot(pci_slot);
kobject_uevent(&pci_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
* @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;
temp = get_slot_from_name(hotplug->name);
if (temp != hotplug)
return -ENODEV;
spin_lock(&pci_hotplug_slot_list_lock);
list_del(&hotplug->slot_list);
spin_unlock(&pci_hotplug_slot_list_lock);
slot = hotplug->pci_slot;
fs_remove_slot(slot);
dbg("Removed slot %s from the list\n", hotplug->name);
hotplug->release(hotplug);
slot->hotplug = NULL;
pci_destroy_slot(slot);
return 0;
}
/**
* 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 __must_check pci_hp_change_slot_info(struct hotplug_slot *hotplug,
struct hotplug_slot_info *info)
{
struct pci_slot *slot;
if (!hotplug || !info)
return -ENODEV;
slot = hotplug->pci_slot;
memcpy(hotplug->info, info, sizeof(struct hotplug_slot_info));
return 0;
}
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);
goto err_cpci;
}
info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
err_cpci:
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");
EXPORT_SYMBOL_GPL(pci_hp_register);
EXPORT_SYMBOL_GPL(pci_hp_deregister);
EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
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