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f46753c5e3
linux/drivers/pci/hotplug/pci_hotplug_core.c
Alex Chiang f46753c5e3 PCI: introduce pci_slot 
Currently, /sys/bus/pci/slots/ only exposes hotplug attributes when a
hotplug driver is loaded, but PCI slots have attributes such as address,
speed, width, etc.  that are not related to hotplug at all.

Introduce pci_slot as the primary data structure and kobject model.
Hotplug attributes described in hotplug_slot become a secondary
structure associated with the pci_slot.

This patch only creates the infrastructure that allows the separation of
PCI slot attributes and hotplug attributes.  In this patch, the PCI
hotplug core remains the only user of this infrastructure, and thus,
/sys/bus/pci/slots/ will still only become populated when a hotplug
driver is loaded.

A later patch in this series will add a second user of this new
infrastructure and demonstrate splitting the task of exposing pci_slot
attributes from hotplug_slot attributes.

  - Make pci_slot the primary sysfs entity. hotplug_slot becomes a
    subsidiary structure.
    o pci_create_slot() creates and registers a slot with the PCI core
    o pci_slot_add_hotplug() gives it hotplug capability

  - Change the prototype of pci_hp_register() to take the bus and
    slot number (on parent bus) as parameters.

  - Remove all the ->get_address methods since this functionality is
    now handled by pci_slot directly.

[achiang@hp.com: rpaphp-correctly-pci_hp_register-for-empty-pci-slots]
Tested-by: Badari Pulavarty <pbadari@us.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: make headers_check happy]
[akpm@linux-foundation.org: nuther build fix]
[akpm@linux-foundation.org: fix typo in #include]
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Cc: Greg KH <greg@kroah.com>
Cc: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Cc: Len Brown <lenb@kernel.org>
Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2008-06-10 14:37:03 -07:00

692 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
* @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, struct pci_bus *bus, int slot_nr)
{
int result;
struct pci_slot *pci_slot;
struct hotplug_slot *tmp;
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. */
tmp = get_slot_from_name(slot->name);
if (tmp)
return -EEXIST;
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;
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
* @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 *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
* @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 *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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