573 lines
14 KiB
C
573 lines
14 KiB
C
/*
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* PCI HotPlug Controller Core
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*
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* Copyright (C) 2001-2002 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001-2002 IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <kristen.c.accardi@intel.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <linux/pagemap.h>
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#include <linux/init.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <linux/pci_hotplug.h>
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#include <asm/uaccess.h>
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#include "../pci.h"
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#define MY_NAME "pci_hotplug"
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#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
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#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
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#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
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#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
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/* local variables */
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static bool debug;
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#define DRIVER_VERSION "0.5"
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#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Scott Murray <scottm@somanetworks.com>"
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#define DRIVER_DESC "PCI Hot Plug PCI Core"
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//////////////////////////////////////////////////////////////////
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static LIST_HEAD(pci_hotplug_slot_list);
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static DEFINE_MUTEX(pci_hp_mutex);
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#ifdef CONFIG_HOTPLUG_PCI_CPCI
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extern int cpci_hotplug_init(int debug);
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extern void cpci_hotplug_exit(void);
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#else
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static inline int cpci_hotplug_init(int debug) { return 0; }
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static inline void cpci_hotplug_exit(void) { }
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#endif
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/* Weee, fun with macros... */
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#define GET_STATUS(name,type) \
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static int get_##name (struct hotplug_slot *slot, type *value) \
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{ \
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struct hotplug_slot_ops *ops = slot->ops; \
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int retval = 0; \
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if (!try_module_get(ops->owner)) \
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return -ENODEV; \
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if (ops->get_##name) \
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retval = ops->get_##name(slot, value); \
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else \
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*value = slot->info->name; \
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module_put(ops->owner); \
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return retval; \
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}
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GET_STATUS(power_status, u8)
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GET_STATUS(attention_status, u8)
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GET_STATUS(latch_status, u8)
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GET_STATUS(adapter_status, u8)
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static ssize_t power_read_file(struct pci_slot *slot, char *buf)
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{
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int retval;
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u8 value;
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retval = get_power_status(slot->hotplug, &value);
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if (retval)
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goto exit;
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retval = sprintf (buf, "%d\n", value);
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exit:
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return retval;
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}
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static ssize_t power_write_file(struct pci_slot *pci_slot, const char *buf,
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size_t count)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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unsigned long lpower;
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u8 power;
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int retval = 0;
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lpower = simple_strtoul (buf, NULL, 10);
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power = (u8)(lpower & 0xff);
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dbg ("power = %d\n", power);
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if (!try_module_get(slot->ops->owner)) {
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retval = -ENODEV;
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goto exit;
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}
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switch (power) {
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case 0:
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if (slot->ops->disable_slot)
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retval = slot->ops->disable_slot(slot);
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break;
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case 1:
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if (slot->ops->enable_slot)
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retval = slot->ops->enable_slot(slot);
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break;
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default:
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err ("Illegal value specified for power\n");
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retval = -EINVAL;
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}
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module_put(slot->ops->owner);
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exit:
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if (retval)
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return retval;
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return count;
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}
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static struct pci_slot_attribute hotplug_slot_attr_power = {
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.attr = {.name = "power", .mode = S_IFREG | S_IRUGO | S_IWUSR},
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.show = power_read_file,
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.store = power_write_file
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};
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static ssize_t attention_read_file(struct pci_slot *slot, char *buf)
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{
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int retval;
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u8 value;
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retval = get_attention_status(slot->hotplug, &value);
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if (retval)
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goto exit;
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retval = sprintf(buf, "%d\n", value);
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exit:
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return retval;
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}
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static ssize_t attention_write_file(struct pci_slot *slot, const char *buf,
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size_t count)
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{
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struct hotplug_slot_ops *ops = slot->hotplug->ops;
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unsigned long lattention;
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u8 attention;
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int retval = 0;
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lattention = simple_strtoul (buf, NULL, 10);
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attention = (u8)(lattention & 0xff);
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dbg (" - attention = %d\n", attention);
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if (!try_module_get(ops->owner)) {
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retval = -ENODEV;
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goto exit;
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}
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if (ops->set_attention_status)
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retval = ops->set_attention_status(slot->hotplug, attention);
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module_put(ops->owner);
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exit:
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if (retval)
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return retval;
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return count;
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}
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static struct pci_slot_attribute hotplug_slot_attr_attention = {
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.attr = {.name = "attention", .mode = S_IFREG | S_IRUGO | S_IWUSR},
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.show = attention_read_file,
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.store = attention_write_file
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};
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static ssize_t latch_read_file(struct pci_slot *slot, char *buf)
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{
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int retval;
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u8 value;
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retval = get_latch_status(slot->hotplug, &value);
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if (retval)
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goto exit;
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retval = sprintf (buf, "%d\n", value);
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exit:
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return retval;
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}
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static struct pci_slot_attribute hotplug_slot_attr_latch = {
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.attr = {.name = "latch", .mode = S_IFREG | S_IRUGO},
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.show = latch_read_file,
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};
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static ssize_t presence_read_file(struct pci_slot *slot, char *buf)
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{
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int retval;
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u8 value;
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retval = get_adapter_status(slot->hotplug, &value);
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if (retval)
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goto exit;
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retval = sprintf (buf, "%d\n", value);
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exit:
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return retval;
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}
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static struct pci_slot_attribute hotplug_slot_attr_presence = {
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.attr = {.name = "adapter", .mode = S_IFREG | S_IRUGO},
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.show = presence_read_file,
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};
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static ssize_t test_write_file(struct pci_slot *pci_slot, const char *buf,
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size_t count)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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unsigned long ltest;
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u32 test;
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int retval = 0;
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ltest = simple_strtoul (buf, NULL, 10);
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test = (u32)(ltest & 0xffffffff);
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dbg ("test = %d\n", test);
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if (!try_module_get(slot->ops->owner)) {
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retval = -ENODEV;
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goto exit;
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}
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if (slot->ops->hardware_test)
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retval = slot->ops->hardware_test(slot, test);
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module_put(slot->ops->owner);
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exit:
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if (retval)
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return retval;
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return count;
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}
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static struct pci_slot_attribute hotplug_slot_attr_test = {
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.attr = {.name = "test", .mode = S_IFREG | S_IRUGO | S_IWUSR},
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.store = test_write_file
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};
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static bool has_power_file(struct pci_slot *pci_slot)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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if ((!slot) || (!slot->ops))
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return false;
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if ((slot->ops->enable_slot) ||
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(slot->ops->disable_slot) ||
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(slot->ops->get_power_status))
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return true;
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return false;
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}
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static bool has_attention_file(struct pci_slot *pci_slot)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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if ((!slot) || (!slot->ops))
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return false;
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if ((slot->ops->set_attention_status) ||
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(slot->ops->get_attention_status))
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return true;
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return false;
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}
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static bool has_latch_file(struct pci_slot *pci_slot)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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if ((!slot) || (!slot->ops))
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return false;
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if (slot->ops->get_latch_status)
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return true;
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return false;
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}
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static bool has_adapter_file(struct pci_slot *pci_slot)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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if ((!slot) || (!slot->ops))
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return false;
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if (slot->ops->get_adapter_status)
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return true;
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return false;
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}
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static bool has_test_file(struct pci_slot *pci_slot)
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{
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struct hotplug_slot *slot = pci_slot->hotplug;
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if ((!slot) || (!slot->ops))
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return false;
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if (slot->ops->hardware_test)
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return true;
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return false;
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}
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static int fs_add_slot(struct pci_slot *slot)
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{
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int retval = 0;
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/* Create symbolic link to the hotplug driver module */
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pci_hp_create_module_link(slot);
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if (has_power_file(slot)) {
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retval = sysfs_create_file(&slot->kobj,
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&hotplug_slot_attr_power.attr);
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if (retval)
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goto exit_power;
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}
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if (has_attention_file(slot)) {
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retval = sysfs_create_file(&slot->kobj,
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&hotplug_slot_attr_attention.attr);
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if (retval)
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goto exit_attention;
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}
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if (has_latch_file(slot)) {
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retval = sysfs_create_file(&slot->kobj,
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&hotplug_slot_attr_latch.attr);
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if (retval)
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goto exit_latch;
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}
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if (has_adapter_file(slot)) {
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retval = sysfs_create_file(&slot->kobj,
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&hotplug_slot_attr_presence.attr);
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if (retval)
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goto exit_adapter;
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}
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if (has_test_file(slot)) {
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retval = sysfs_create_file(&slot->kobj,
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&hotplug_slot_attr_test.attr);
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if (retval)
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goto exit_test;
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}
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goto exit;
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exit_test:
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if (has_adapter_file(slot))
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sysfs_remove_file(&slot->kobj,
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&hotplug_slot_attr_presence.attr);
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exit_adapter:
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if (has_latch_file(slot))
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sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
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exit_latch:
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if (has_attention_file(slot))
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sysfs_remove_file(&slot->kobj,
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&hotplug_slot_attr_attention.attr);
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exit_attention:
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if (has_power_file(slot))
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sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
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exit_power:
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pci_hp_remove_module_link(slot);
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exit:
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return retval;
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}
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static void fs_remove_slot(struct pci_slot *slot)
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{
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if (has_power_file(slot))
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sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
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if (has_attention_file(slot))
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sysfs_remove_file(&slot->kobj,
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&hotplug_slot_attr_attention.attr);
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if (has_latch_file(slot))
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sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
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if (has_adapter_file(slot))
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sysfs_remove_file(&slot->kobj,
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&hotplug_slot_attr_presence.attr);
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if (has_test_file(slot))
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sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_test.attr);
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pci_hp_remove_module_link(slot);
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}
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static struct hotplug_slot *get_slot_from_name (const char *name)
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{
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struct hotplug_slot *slot;
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struct list_head *tmp;
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list_for_each (tmp, &pci_hotplug_slot_list) {
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slot = list_entry (tmp, struct hotplug_slot, slot_list);
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if (strcmp(hotplug_slot_name(slot), name) == 0)
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return slot;
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}
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return NULL;
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}
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/**
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* __pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
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* @bus: bus this slot is on
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* @slot: pointer to the &struct hotplug_slot to register
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* @devnr: device number
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* @name: name registered with kobject core
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* @owner: caller module owner
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* @mod_name: caller module name
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*
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* Registers a hotplug slot with the pci hotplug subsystem, which will allow
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* userspace interaction to the slot.
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*
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* Returns 0 if successful, anything else for an error.
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*/
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int __pci_hp_register(struct hotplug_slot *slot, struct pci_bus *bus,
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int devnr, const char *name,
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struct module *owner, const char *mod_name)
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{
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int result;
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struct pci_slot *pci_slot;
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if (slot == NULL)
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return -ENODEV;
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if ((slot->info == NULL) || (slot->ops == NULL))
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return -EINVAL;
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if (slot->release == NULL) {
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dbg("Why are you trying to register a hotplug slot "
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"without a proper release function?\n");
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return -EINVAL;
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}
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slot->ops->owner = owner;
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slot->ops->mod_name = mod_name;
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mutex_lock(&pci_hp_mutex);
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/*
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* No problems if we call this interface from both ACPI_PCI_SLOT
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* driver and call it here again. If we've already created the
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* pci_slot, the interface will simply bump the refcount.
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*/
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pci_slot = pci_create_slot(bus, devnr, name, slot);
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if (IS_ERR(pci_slot)) {
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result = PTR_ERR(pci_slot);
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goto out;
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}
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slot->pci_slot = pci_slot;
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pci_slot->hotplug = slot;
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list_add(&slot->slot_list, &pci_hotplug_slot_list);
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result = fs_add_slot(pci_slot);
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kobject_uevent(&pci_slot->kobj, KOBJ_ADD);
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dbg("Added slot %s to the list\n", name);
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out:
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mutex_unlock(&pci_hp_mutex);
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return result;
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}
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/**
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* pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
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* @hotplug: pointer to the &struct hotplug_slot to deregister
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*
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* The @slot must have been registered with the pci hotplug subsystem
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* previously with a call to pci_hp_register().
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*
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* Returns 0 if successful, anything else for an error.
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*/
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int pci_hp_deregister(struct hotplug_slot *hotplug)
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{
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struct hotplug_slot *temp;
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struct pci_slot *slot;
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if (!hotplug)
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return -ENODEV;
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mutex_lock(&pci_hp_mutex);
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temp = get_slot_from_name(hotplug_slot_name(hotplug));
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if (temp != hotplug) {
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mutex_unlock(&pci_hp_mutex);
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return -ENODEV;
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}
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list_del(&hotplug->slot_list);
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slot = hotplug->pci_slot;
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fs_remove_slot(slot);
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dbg("Removed slot %s from the list\n", hotplug_slot_name(hotplug));
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hotplug->release(hotplug);
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slot->hotplug = NULL;
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pci_destroy_slot(slot);
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mutex_unlock(&pci_hp_mutex);
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return 0;
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}
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/**
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* pci_hp_change_slot_info - changes the slot's information structure in the core
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* @hotplug: pointer to the slot whose info has changed
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* @info: pointer to the info copy into the slot's info structure
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*
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* @slot must have been registered with the pci
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* hotplug subsystem previously with a call to pci_hp_register().
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*
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* Returns 0 if successful, anything else for an error.
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*/
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int __must_check pci_hp_change_slot_info(struct hotplug_slot *hotplug,
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struct hotplug_slot_info *info)
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{
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struct pci_slot *slot;
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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);
|