+++ /dev/null
-/*
- * Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
- *
- * Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com>
- *
- * 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.
- *
- * Fixes/additions:
- * Markus Lidel <Markus.Lidel@shadowconnect.com>
- * initial version.
- */
-
-#include <linux/device.h>
-#include <linux/module.h>
-#include <linux/rwsem.h>
-#include "i2o.h"
-#include <linux/workqueue.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include "core.h"
-
-#define OSM_NAME "i2o"
-
-/* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
-static unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
-module_param_named(max_drivers, i2o_max_drivers, uint, 0);
-MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
-
-/* I2O drivers lock and array */
-static spinlock_t i2o_drivers_lock;
-static struct i2o_driver **i2o_drivers;
-
-/**
- * i2o_bus_match - Tell if I2O device class id matches the class ids of the I2O driver (OSM)
- * @dev: device which should be verified
- * @drv: the driver to match against
- *
- * Used by the bus to check if the driver wants to handle the device.
- *
- * Returns 1 if the class ids of the driver match the class id of the
- * device, otherwise 0.
- */
-static int i2o_bus_match(struct device *dev, struct device_driver *drv)
-{
- struct i2o_device *i2o_dev = to_i2o_device(dev);
- struct i2o_driver *i2o_drv = to_i2o_driver(drv);
- struct i2o_class_id *ids = i2o_drv->classes;
-
- if (ids)
- while (ids->class_id != I2O_CLASS_END) {
- if (ids->class_id == i2o_dev->lct_data.class_id)
- return 1;
- ids++;
- }
- return 0;
-};
-
-/* I2O bus type */
-struct bus_type i2o_bus_type = {
- .name = "i2o",
- .match = i2o_bus_match,
- .dev_groups = i2o_device_groups,
-};
-
-/**
- * i2o_driver_register - Register a I2O driver (OSM) in the I2O core
- * @drv: I2O driver which should be registered
- *
- * Registers the OSM drv in the I2O core and creates an event queues if
- * necessary.
- *
- * Returns 0 on success or negative error code on failure.
- */
-int i2o_driver_register(struct i2o_driver *drv)
-{
- struct i2o_controller *c;
- int i;
- int rc = 0;
- unsigned long flags;
-
- osm_debug("Register driver %s\n", drv->name);
-
- if (drv->event) {
- drv->event_queue = alloc_workqueue("%s", WQ_MEM_RECLAIM, 1,
- drv->name);
- if (!drv->event_queue) {
- osm_err("Could not initialize event queue for driver "
- "%s\n", drv->name);
- return -EFAULT;
- }
- osm_debug("Event queue initialized for driver %s\n", drv->name);
- } else
- drv->event_queue = NULL;
-
- drv->driver.name = drv->name;
- drv->driver.bus = &i2o_bus_type;
-
- spin_lock_irqsave(&i2o_drivers_lock, flags);
-
- for (i = 0; i2o_drivers[i]; i++)
- if (i >= i2o_max_drivers) {
- osm_err("too many drivers registered, increase max_drivers\n");
- spin_unlock_irqrestore(&i2o_drivers_lock, flags);
- rc = -EFAULT;
- goto out;
- }
-
- drv->context = i;
- i2o_drivers[i] = drv;
-
- spin_unlock_irqrestore(&i2o_drivers_lock, flags);
-
- osm_debug("driver %s gets context id %d\n", drv->name, drv->context);
-
- list_for_each_entry(c, &i2o_controllers, list) {
- struct i2o_device *i2o_dev;
-
- i2o_driver_notify_controller_add(drv, c);
- list_for_each_entry(i2o_dev, &c->devices, list)
- i2o_driver_notify_device_add(drv, i2o_dev);
- }
-
- rc = driver_register(&drv->driver);
- if (rc)
- goto out;
-
- return 0;
-out:
- if (drv->event_queue) {
- destroy_workqueue(drv->event_queue);
- drv->event_queue = NULL;
- }
-
- return rc;
-};
-
-/**
- * i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
- * @drv: I2O driver which should be unregistered
- *
- * Unregisters the OSM drv from the I2O core and cleanup event queues if
- * necessary.
- */
-void i2o_driver_unregister(struct i2o_driver *drv)
-{
- struct i2o_controller *c;
- unsigned long flags;
-
- osm_debug("unregister driver %s\n", drv->name);
-
- driver_unregister(&drv->driver);
-
- list_for_each_entry(c, &i2o_controllers, list) {
- struct i2o_device *i2o_dev;
-
- list_for_each_entry(i2o_dev, &c->devices, list)
- i2o_driver_notify_device_remove(drv, i2o_dev);
-
- i2o_driver_notify_controller_remove(drv, c);
- }
-
- spin_lock_irqsave(&i2o_drivers_lock, flags);
- i2o_drivers[drv->context] = NULL;
- spin_unlock_irqrestore(&i2o_drivers_lock, flags);
-
- if (drv->event_queue) {
- destroy_workqueue(drv->event_queue);
- drv->event_queue = NULL;
- osm_debug("event queue removed for %s\n", drv->name);
- }
-};
-
-/**
- * i2o_driver_dispatch - dispatch an I2O reply message
- * @c: I2O controller of the message
- * @m: I2O message number
- *
- * The reply is delivered to the driver from which the original message
- * was. This function is only called from interrupt context.
- *
- * Returns 0 on success and the message should not be flushed. Returns > 0
- * on success and if the message should be flushed afterwords. Returns
- * negative error code on failure (the message will be flushed too).
- */
-int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
-{
- struct i2o_driver *drv;
- struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
- u32 context = le32_to_cpu(msg->u.s.icntxt);
- unsigned long flags;
-
- if (unlikely(context >= i2o_max_drivers)) {
- osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
- context);
- return -EIO;
- }
-
- spin_lock_irqsave(&i2o_drivers_lock, flags);
- drv = i2o_drivers[context];
- spin_unlock_irqrestore(&i2o_drivers_lock, flags);
-
- if (unlikely(!drv)) {
- osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
- context);
- return -EIO;
- }
-
- if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
- struct i2o_device *dev, *tmp;
- struct i2o_event *evt;
- u16 size;
- u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;
-
- osm_debug("event received from device %d\n", tid);
-
- if (!drv->event)
- return -EIO;
-
- /* cut of header from message size (in 32-bit words) */
- size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;
-
- evt = kzalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
- if (!evt)
- return -ENOMEM;
-
- evt->size = size;
- evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
- evt->event_indicator = le32_to_cpu(msg->body[0]);
- memcpy(&evt->data, &msg->body[1], size * 4);
-
- list_for_each_entry_safe(dev, tmp, &c->devices, list)
- if (dev->lct_data.tid == tid) {
- evt->i2o_dev = dev;
- break;
- }
-
- INIT_WORK(&evt->work, drv->event);
- queue_work(drv->event_queue, &evt->work);
- return 1;
- }
-
- if (unlikely(!drv->reply)) {
- osm_debug("%s: Reply to driver %s, but no reply function defined!\n",
- c->name, drv->name);
- return -EIO;
- }
-
- return drv->reply(c, m, msg);
-}
-
-/**
- * i2o_driver_notify_controller_add_all - Send notify of added controller
- * @c: newly added controller
- *
- * Send notifications to all registered drivers that a new controller was
- * added.
- */
-void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
-{
- int i;
- struct i2o_driver *drv;
-
- for (i = 0; i < i2o_max_drivers; i++) {
- drv = i2o_drivers[i];
-
- if (drv)
- i2o_driver_notify_controller_add(drv, c);
- }
-}
-
-/**
- * i2o_driver_notify_controller_remove_all - Send notify of removed controller
- * @c: controller that is being removed
- *
- * Send notifications to all registered drivers that a controller was
- * removed.
- */
-void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
-{
- int i;
- struct i2o_driver *drv;
-
- for (i = 0; i < i2o_max_drivers; i++) {
- drv = i2o_drivers[i];
-
- if (drv)
- i2o_driver_notify_controller_remove(drv, c);
- }
-}
-
-/**
- * i2o_driver_notify_device_add_all - Send notify of added device
- * @i2o_dev: newly added I2O device
- *
- * Send notifications to all registered drivers that a device was added.
- */
-void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
-{
- int i;
- struct i2o_driver *drv;
-
- for (i = 0; i < i2o_max_drivers; i++) {
- drv = i2o_drivers[i];
-
- if (drv)
- i2o_driver_notify_device_add(drv, i2o_dev);
- }
-}
-
-/**
- * i2o_driver_notify_device_remove_all - Send notify of removed device
- * @i2o_dev: device that is being removed
- *
- * Send notifications to all registered drivers that a device was removed.
- */
-void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
-{
- int i;
- struct i2o_driver *drv;
-
- for (i = 0; i < i2o_max_drivers; i++) {
- drv = i2o_drivers[i];
-
- if (drv)
- i2o_driver_notify_device_remove(drv, i2o_dev);
- }
-}
-
-/**
- * i2o_driver_init - initialize I2O drivers (OSMs)
- *
- * Registers the I2O bus and allocate memory for the array of OSMs.
- *
- * Returns 0 on success or negative error code on failure.
- */
-int __init i2o_driver_init(void)
-{
- int rc = 0;
-
- spin_lock_init(&i2o_drivers_lock);
-
- if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64)) {
- osm_warn("max_drivers set to %d, but must be >=2 and <= 64\n",
- i2o_max_drivers);
- i2o_max_drivers = I2O_MAX_DRIVERS;
- }
- osm_info("max drivers = %d\n", i2o_max_drivers);
-
- i2o_drivers =
- kcalloc(i2o_max_drivers, sizeof(*i2o_drivers), GFP_KERNEL);
- if (!i2o_drivers)
- return -ENOMEM;
-
- rc = bus_register(&i2o_bus_type);
-
- if (rc < 0)
- kfree(i2o_drivers);
-
- return rc;
-};
-
-/**
- * i2o_driver_exit - clean up I2O drivers (OSMs)
- *
- * Unregisters the I2O bus and frees driver array.
- */
-void i2o_driver_exit(void)
-{
- bus_unregister(&i2o_bus_type);
- kfree(i2o_drivers);
-};
-
-EXPORT_SYMBOL(i2o_driver_register);
-EXPORT_SYMBOL(i2o_driver_unregister);
-EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
-EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
-EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
-EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);
Code Review / kvmfornfv.git / blobdiff