mirror of https://gitee.com/openkylin/linux.git
379 lines
9.4 KiB
C
379 lines
9.4 KiB
C
/*
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* Functions to handle I2O drivers (OSMs) and I2O bus type for sysfs
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*
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* Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Fixes/additions:
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* Markus Lidel <Markus.Lidel@shadowconnect.com>
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* initial version.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/rwsem.h>
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#include <linux/i2o.h>
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#include <linux/workqueue.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include "core.h"
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#define OSM_NAME "i2o"
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/* max_drivers - Maximum I2O drivers (OSMs) which could be registered */
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static unsigned int i2o_max_drivers = I2O_MAX_DRIVERS;
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module_param_named(max_drivers, i2o_max_drivers, uint, 0);
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MODULE_PARM_DESC(max_drivers, "maximum number of OSM's to support");
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/* I2O drivers lock and array */
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static spinlock_t i2o_drivers_lock;
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static struct i2o_driver **i2o_drivers;
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/**
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* i2o_bus_match - Tell if a I2O device class id match the class ids of
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* the I2O driver (OSM)
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*
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* @dev: device which should be verified
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* @drv: the driver to match against
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*
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* Used by the bus to check if the driver wants to handle the device.
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*
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* Returns 1 if the class ids of the driver match the class id of the
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* device, otherwise 0.
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*/
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static int i2o_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct i2o_device *i2o_dev = to_i2o_device(dev);
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struct i2o_driver *i2o_drv = to_i2o_driver(drv);
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struct i2o_class_id *ids = i2o_drv->classes;
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if (ids)
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while (ids->class_id != I2O_CLASS_END) {
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if (ids->class_id == i2o_dev->lct_data.class_id)
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return 1;
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ids++;
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}
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return 0;
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};
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/* I2O bus type */
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struct bus_type i2o_bus_type = {
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.name = "i2o",
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.match = i2o_bus_match,
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.dev_attrs = i2o_device_attrs
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};
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/**
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* i2o_driver_register - Register a I2O driver (OSM) in the I2O core
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* @drv: I2O driver which should be registered
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*
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* Registers the OSM drv in the I2O core and creates an event queues if
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* necessary.
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*
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* Returns 0 on success or negative error code on failure.
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*/
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int i2o_driver_register(struct i2o_driver *drv)
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{
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struct i2o_controller *c;
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int i;
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int rc = 0;
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unsigned long flags;
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osm_debug("Register driver %s\n", drv->name);
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if (drv->event) {
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drv->event_queue = create_workqueue(drv->name);
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if (!drv->event_queue) {
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osm_err("Could not initialize event queue for driver "
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"%s\n", drv->name);
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return -EFAULT;
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}
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osm_debug("Event queue initialized for driver %s\n", drv->name);
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} else
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drv->event_queue = NULL;
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drv->driver.name = drv->name;
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drv->driver.bus = &i2o_bus_type;
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spin_lock_irqsave(&i2o_drivers_lock, flags);
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for (i = 0; i2o_drivers[i]; i++)
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if (i >= i2o_max_drivers) {
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osm_err("too many drivers registered, increase "
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"max_drivers\n");
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spin_unlock_irqrestore(&i2o_drivers_lock, flags);
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return -EFAULT;
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}
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drv->context = i;
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i2o_drivers[i] = drv;
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spin_unlock_irqrestore(&i2o_drivers_lock, flags);
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osm_debug("driver %s gets context id %d\n", drv->name, drv->context);
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list_for_each_entry(c, &i2o_controllers, list) {
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struct i2o_device *i2o_dev;
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i2o_driver_notify_controller_add(drv, c);
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list_for_each_entry(i2o_dev, &c->devices, list)
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i2o_driver_notify_device_add(drv, i2o_dev);
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}
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rc = driver_register(&drv->driver);
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if (rc)
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destroy_workqueue(drv->event_queue);
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return rc;
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};
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/**
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* i2o_driver_unregister - Unregister a I2O driver (OSM) from the I2O core
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* @drv: I2O driver which should be unregistered
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*
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* Unregisters the OSM drv from the I2O core and cleanup event queues if
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* necessary.
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*/
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void i2o_driver_unregister(struct i2o_driver *drv)
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{
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struct i2o_controller *c;
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unsigned long flags;
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osm_debug("unregister driver %s\n", drv->name);
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driver_unregister(&drv->driver);
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list_for_each_entry(c, &i2o_controllers, list) {
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struct i2o_device *i2o_dev;
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list_for_each_entry(i2o_dev, &c->devices, list)
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i2o_driver_notify_device_remove(drv, i2o_dev);
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i2o_driver_notify_controller_remove(drv, c);
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}
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spin_lock_irqsave(&i2o_drivers_lock, flags);
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i2o_drivers[drv->context] = NULL;
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spin_unlock_irqrestore(&i2o_drivers_lock, flags);
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if (drv->event_queue) {
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destroy_workqueue(drv->event_queue);
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drv->event_queue = NULL;
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osm_debug("event queue removed for %s\n", drv->name);
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}
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};
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/**
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* i2o_driver_dispatch - dispatch an I2O reply message
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* @c: I2O controller of the message
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* @m: I2O message number
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* @msg: I2O message to be delivered
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*
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* The reply is delivered to the driver from which the original message
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* was. This function is only called from interrupt context.
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*
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* Returns 0 on success and the message should not be flushed. Returns > 0
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* on success and if the message should be flushed afterwords. Returns
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* negative error code on failure (the message will be flushed too).
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*/
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int i2o_driver_dispatch(struct i2o_controller *c, u32 m)
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{
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struct i2o_driver *drv;
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struct i2o_message *msg = i2o_msg_out_to_virt(c, m);
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u32 context = le32_to_cpu(msg->u.s.icntxt);
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unsigned long flags;
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if (unlikely(context >= i2o_max_drivers)) {
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osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
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context);
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return -EIO;
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}
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spin_lock_irqsave(&i2o_drivers_lock, flags);
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drv = i2o_drivers[context];
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spin_unlock_irqrestore(&i2o_drivers_lock, flags);
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if (unlikely(!drv)) {
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osm_warn("%s: Spurious reply to unknown driver %d\n", c->name,
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context);
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return -EIO;
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}
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if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_UTIL_EVT_REGISTER) {
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struct i2o_device *dev, *tmp;
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struct i2o_event *evt;
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u16 size;
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u16 tid = le32_to_cpu(msg->u.head[1]) & 0xfff;
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osm_debug("event received from device %d\n", tid);
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if (!drv->event)
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return -EIO;
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/* cut of header from message size (in 32-bit words) */
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size = (le32_to_cpu(msg->u.head[0]) >> 16) - 5;
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evt = kzalloc(size * 4 + sizeof(*evt), GFP_ATOMIC);
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if (!evt)
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return -ENOMEM;
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evt->size = size;
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evt->tcntxt = le32_to_cpu(msg->u.s.tcntxt);
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evt->event_indicator = le32_to_cpu(msg->body[0]);
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memcpy(&evt->data, &msg->body[1], size * 4);
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list_for_each_entry_safe(dev, tmp, &c->devices, list)
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if (dev->lct_data.tid == tid) {
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evt->i2o_dev = dev;
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break;
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}
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INIT_WORK(&evt->work, (void (*)(void *))drv->event, evt);
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queue_work(drv->event_queue, &evt->work);
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return 1;
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}
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if (unlikely(!drv->reply)) {
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osm_debug("%s: Reply to driver %s, but no reply function"
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" defined!\n", c->name, drv->name);
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return -EIO;
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}
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return drv->reply(c, m, msg);
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}
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/**
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* i2o_driver_notify_controller_add_all - Send notify of added controller
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* to all I2O drivers
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*
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* Send notifications to all registered drivers that a new controller was
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* added.
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*/
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void i2o_driver_notify_controller_add_all(struct i2o_controller *c)
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{
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int i;
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struct i2o_driver *drv;
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for (i = 0; i < I2O_MAX_DRIVERS; i++) {
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drv = i2o_drivers[i];
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if (drv)
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i2o_driver_notify_controller_add(drv, c);
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}
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}
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/**
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* i2o_driver_notify_controller_remove_all - Send notify of removed
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* controller to all I2O drivers
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*
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* Send notifications to all registered drivers that a controller was
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* removed.
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*/
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void i2o_driver_notify_controller_remove_all(struct i2o_controller *c)
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{
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int i;
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struct i2o_driver *drv;
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for (i = 0; i < I2O_MAX_DRIVERS; i++) {
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drv = i2o_drivers[i];
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if (drv)
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i2o_driver_notify_controller_remove(drv, c);
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}
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}
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/**
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* i2o_driver_notify_device_add_all - Send notify of added device to all
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* I2O drivers
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*
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* Send notifications to all registered drivers that a device was added.
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*/
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void i2o_driver_notify_device_add_all(struct i2o_device *i2o_dev)
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{
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int i;
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struct i2o_driver *drv;
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for (i = 0; i < I2O_MAX_DRIVERS; i++) {
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drv = i2o_drivers[i];
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if (drv)
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i2o_driver_notify_device_add(drv, i2o_dev);
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}
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}
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/**
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* i2o_driver_notify_device_remove_all - Send notify of removed device to
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* all I2O drivers
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*
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* Send notifications to all registered drivers that a device was removed.
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*/
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void i2o_driver_notify_device_remove_all(struct i2o_device *i2o_dev)
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{
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int i;
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struct i2o_driver *drv;
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for (i = 0; i < I2O_MAX_DRIVERS; i++) {
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drv = i2o_drivers[i];
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if (drv)
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i2o_driver_notify_device_remove(drv, i2o_dev);
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}
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}
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/**
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* i2o_driver_init - initialize I2O drivers (OSMs)
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*
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* Registers the I2O bus and allocate memory for the array of OSMs.
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*
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* Returns 0 on success or negative error code on failure.
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*/
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int __init i2o_driver_init(void)
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{
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int rc = 0;
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spin_lock_init(&i2o_drivers_lock);
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if ((i2o_max_drivers < 2) || (i2o_max_drivers > 64) ||
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((i2o_max_drivers ^ (i2o_max_drivers - 1)) !=
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(2 * i2o_max_drivers - 1))) {
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osm_warn("max_drivers set to %d, but must be >=2 and <= 64 and "
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"a power of 2\n", i2o_max_drivers);
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i2o_max_drivers = I2O_MAX_DRIVERS;
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}
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osm_info("max drivers = %d\n", i2o_max_drivers);
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i2o_drivers =
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kzalloc(i2o_max_drivers * sizeof(*i2o_drivers), GFP_KERNEL);
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if (!i2o_drivers)
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return -ENOMEM;
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rc = bus_register(&i2o_bus_type);
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if (rc < 0)
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kfree(i2o_drivers);
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return rc;
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};
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/**
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* i2o_driver_exit - clean up I2O drivers (OSMs)
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*
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* Unregisters the I2O bus and free driver array.
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*/
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void __exit i2o_driver_exit(void)
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{
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bus_unregister(&i2o_bus_type);
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kfree(i2o_drivers);
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};
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EXPORT_SYMBOL(i2o_driver_register);
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EXPORT_SYMBOL(i2o_driver_unregister);
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EXPORT_SYMBOL(i2o_driver_notify_controller_add_all);
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EXPORT_SYMBOL(i2o_driver_notify_controller_remove_all);
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EXPORT_SYMBOL(i2o_driver_notify_device_add_all);
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EXPORT_SYMBOL(i2o_driver_notify_device_remove_all);
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