![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
716 lines
18 KiB
C
716 lines
18 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 <greg@kroah.com>
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*
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* Filesystem portion based on work done by Pat Mochel on ddfs/driverfs
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*
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*/
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#include <linux/config.h>
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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/pagemap.h>
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#include <linux/slab.h>
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#include <linux/smp_lock.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/pci.h>
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#include <asm/uaccess.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include "pci_hotplug.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 , __FUNCTION__ , ## 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 int 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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struct subsystem pci_hotplug_slots_subsys;
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static ssize_t hotplug_slot_attr_show(struct kobject *kobj,
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struct attribute *attr, char *buf)
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{
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struct hotplug_slot *slot = to_hotplug_slot(kobj);
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struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
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return attribute->show ? attribute->show(slot, buf) : 0;
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}
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static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
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struct attribute *attr, const char *buf, size_t len)
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{
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struct hotplug_slot *slot = to_hotplug_slot(kobj);
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struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
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return attribute->store ? attribute->store(slot, buf, len) : 0;
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}
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static struct sysfs_ops hotplug_slot_sysfs_ops = {
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.show = hotplug_slot_attr_show,
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.store = hotplug_slot_attr_store,
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};
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static void hotplug_slot_release(struct kobject *kobj)
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{
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struct hotplug_slot *slot = to_hotplug_slot(kobj);
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if (slot->release)
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slot->release(slot);
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}
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static struct kobj_type hotplug_slot_ktype = {
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.sysfs_ops = &hotplug_slot_sysfs_ops,
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.release = &hotplug_slot_release,
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};
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decl_subsys_name(pci_hotplug_slots, slots, &hotplug_slot_ktype, NULL);
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/* these strings match up with the values in pci_bus_speed */
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static char *pci_bus_speed_strings[] = {
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"33 MHz PCI", /* 0x00 */
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"66 MHz PCI", /* 0x01 */
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"66 MHz PCIX", /* 0x02 */
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"100 MHz PCIX", /* 0x03 */
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"133 MHz PCIX", /* 0x04 */
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NULL, /* 0x05 */
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NULL, /* 0x06 */
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NULL, /* 0x07 */
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NULL, /* 0x08 */
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"66 MHz PCIX 266", /* 0x09 */
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"100 MHz PCIX 266", /* 0x0a */
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"133 MHz PCIX 266", /* 0x0b */
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NULL, /* 0x0c */
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NULL, /* 0x0d */
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NULL, /* 0x0e */
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NULL, /* 0x0f */
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NULL, /* 0x10 */
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"66 MHz PCIX 533", /* 0x11 */
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"100 MHz PCIX 533", /* 0x12 */
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"133 MHz PCIX 533", /* 0x13 */
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"25 GBps PCI-E", /* 0x14 */
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};
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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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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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} \
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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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GET_STATUS(address, u32)
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GET_STATUS(max_bus_speed, enum pci_bus_speed)
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GET_STATUS(cur_bus_speed, enum pci_bus_speed)
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static ssize_t power_read_file (struct hotplug_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, &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 hotplug_slot *slot, const char *buf,
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size_t count)
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{
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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 hotplug_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 hotplug_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, &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 hotplug_slot *slot, const char *buf,
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size_t count)
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{
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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(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->set_attention_status)
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retval = slot->ops->set_attention_status(slot, attention);
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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 hotplug_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 hotplug_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, &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 hotplug_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 hotplug_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, &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 hotplug_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 address_read_file (struct hotplug_slot *slot, char *buf)
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{
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int retval;
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u32 address;
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retval = get_address (slot, &address);
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if (retval)
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goto exit;
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retval = sprintf (buf, "%04x:%02x:%02x\n",
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(address >> 16) & 0xffff,
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(address >> 8) & 0xff,
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address & 0xff);
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exit:
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return retval;
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}
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static struct hotplug_slot_attribute hotplug_slot_attr_address = {
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.attr = {.name = "address", .mode = S_IFREG | S_IRUGO},
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.show = address_read_file,
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};
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static char *unknown_speed = "Unknown bus speed";
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static ssize_t max_bus_speed_read_file (struct hotplug_slot *slot, char *buf)
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{
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char *speed_string;
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int retval;
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enum pci_bus_speed value;
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retval = get_max_bus_speed (slot, &value);
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if (retval)
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goto exit;
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if (value == PCI_SPEED_UNKNOWN)
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speed_string = unknown_speed;
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else
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speed_string = pci_bus_speed_strings[value];
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retval = sprintf (buf, "%s\n", speed_string);
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exit:
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return retval;
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}
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static struct hotplug_slot_attribute hotplug_slot_attr_max_bus_speed = {
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.attr = {.name = "max_bus_speed", .mode = S_IFREG | S_IRUGO},
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.show = max_bus_speed_read_file,
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};
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static ssize_t cur_bus_speed_read_file (struct hotplug_slot *slot, char *buf)
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{
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char *speed_string;
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int retval;
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enum pci_bus_speed value;
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retval = get_cur_bus_speed (slot, &value);
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if (retval)
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goto exit;
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if (value == PCI_SPEED_UNKNOWN)
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speed_string = unknown_speed;
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else
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speed_string = pci_bus_speed_strings[value];
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retval = sprintf (buf, "%s\n", speed_string);
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exit:
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return retval;
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}
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static struct hotplug_slot_attribute hotplug_slot_attr_cur_bus_speed = {
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.attr = {.name = "cur_bus_speed", .mode = S_IFREG | S_IRUGO},
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.show = cur_bus_speed_read_file,
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};
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static ssize_t test_write_file (struct hotplug_slot *slot, const char *buf,
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size_t count)
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{
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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 hotplug_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 int has_power_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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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 0;
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return -ENOENT;
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}
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static int has_attention_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if ((slot->ops->set_attention_status) ||
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(slot->ops->get_attention_status))
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return 0;
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return -ENOENT;
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}
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static int has_latch_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if (slot->ops->get_latch_status)
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return 0;
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return -ENOENT;
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}
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static int has_adapter_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if (slot->ops->get_adapter_status)
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return 0;
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return -ENOENT;
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}
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static int has_address_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if (slot->ops->get_address)
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return 0;
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return -ENOENT;
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}
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static int has_max_bus_speed_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if (slot->ops->get_max_bus_speed)
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return 0;
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return -ENOENT;
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}
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static int has_cur_bus_speed_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if (slot->ops->get_cur_bus_speed)
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return 0;
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return -ENOENT;
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}
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static int has_test_file (struct hotplug_slot *slot)
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{
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if ((!slot) || (!slot->ops))
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return -ENODEV;
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if (slot->ops->hardware_test)
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return 0;
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return -ENOENT;
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}
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static int fs_add_slot (struct hotplug_slot *slot)
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{
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if (has_power_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_power.attr);
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if (has_attention_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
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if (has_latch_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
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if (has_adapter_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
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if (has_address_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_address.attr);
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if (has_max_bus_speed_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
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if (has_cur_bus_speed_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
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if (has_test_file(slot) == 0)
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sysfs_create_file(&slot->kobj, &hotplug_slot_attr_test.attr);
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return 0;
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}
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static void fs_remove_slot (struct hotplug_slot *slot)
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{
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if (has_power_file(slot) == 0)
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sysfs_remove_file(&slot->kobj, &hotplug_slot_attr_power.attr);
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if (has_attention_file(slot) == 0)
|
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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;
|
|
}
|
|
|
|
kobject_set_name(&slot->kobj, "%s", slot->name);
|
|
kobj_set_kset_s(slot, pci_hotplug_slots_subsys);
|
|
|
|
/* this can fail if we have already registered a slot with the same name */
|
|
if (kobject_register(&slot->kobj)) {
|
|
err("Unable to register kobject");
|
|
return -EINVAL;
|
|
}
|
|
|
|
list_add (&slot->slot_list, &pci_hotplug_slot_list);
|
|
|
|
result = fs_add_slot (slot);
|
|
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_unregister(&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 pci_hp_change_slot_info (struct hotplug_slot *slot, struct hotplug_slot_info *info)
|
|
{
|
|
if ((slot == NULL) || (info == NULL))
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* check all fields in the info structure, and update timestamps
|
|
* for the files referring to the fields that have now changed.
|
|
*/
|
|
if ((has_power_file(slot) == 0) &&
|
|
(slot->info->power_status != info->power_status))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_power.attr);
|
|
|
|
if ((has_attention_file(slot) == 0) &&
|
|
(slot->info->attention_status != info->attention_status))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_attention.attr);
|
|
|
|
if ((has_latch_file(slot) == 0) &&
|
|
(slot->info->latch_status != info->latch_status))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_latch.attr);
|
|
|
|
if ((has_adapter_file(slot) == 0) &&
|
|
(slot->info->adapter_status != info->adapter_status))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_presence.attr);
|
|
|
|
if ((has_address_file(slot) == 0) &&
|
|
(slot->info->address != info->address))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_address.attr);
|
|
|
|
if ((has_max_bus_speed_file(slot) == 0) &&
|
|
(slot->info->max_bus_speed != info->max_bus_speed))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_max_bus_speed.attr);
|
|
|
|
if ((has_cur_bus_speed_file(slot) == 0) &&
|
|
(slot->info->cur_bus_speed != info->cur_bus_speed))
|
|
sysfs_update_file(&slot->kobj, &hotplug_slot_attr_cur_bus_speed.attr);
|
|
|
|
memcpy (slot->info, info, sizeof (struct hotplug_slot_info));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init pci_hotplug_init (void)
|
|
{
|
|
int result;
|
|
|
|
kset_set_kset_s(&pci_hotplug_slots_subsys, pci_bus_type.subsys);
|
|
result = subsystem_register(&pci_hotplug_slots_subsys);
|
|
if (result) {
|
|
err("Register subsys with error %d\n", result);
|
|
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:
|
|
subsystem_unregister(&pci_hotplug_slots_subsys);
|
|
exit:
|
|
return result;
|
|
}
|
|
|
|
static void __exit pci_hotplug_exit (void)
|
|
{
|
|
cpci_hotplug_exit();
|
|
subsystem_unregister(&pci_hotplug_slots_subsys);
|
|
}
|
|
|
|
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_subsys);
|
|
EXPORT_SYMBOL_GPL(pci_hp_register);
|
|
EXPORT_SYMBOL_GPL(pci_hp_deregister);
|
|
EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
|