mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
90ab5ee941
module_param(bool) used to counter-intuitively take an int. In
fddd5201
(mid-2009) we allowed bool or int/unsigned int using a messy
trick.
It's time to remove the int/unsigned int option. For this version
it'll simply give a warning, but it'll break next kernel version.
Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
573 lines
14 KiB
C
573 lines
14 KiB
C
/*
|
|
* 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"
|
|
|
|
#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);
|
|
|
|
#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)) \
|
|
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)
|
|
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 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;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|