Linux-2.6.33.2/drivers/message/i2o/exec-osm.c
/*
* Executive OSM
*
* Copyright (C) 1999-2002 Red Hat Software
*
* Written by Alan Cox, Building Number Three Ltd
*
* 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.
*
* A lot of the I2O message side code from this is taken from the Red
* Creek RCPCI45 adapter driver by Red Creek Communications
*
* Fixes/additions:
* Philipp Rumpf
* Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
* Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
* Deepak Saxena <deepak@plexity.net>
* Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
* Alan Cox <alan@lxorguk.ukuu.org.uk>:
* Ported to Linux 2.5.
* Markus Lidel <Markus.Lidel@shadowconnect.com>:
* Minor fixes for 2.6.
* Markus Lidel <Markus.Lidel@shadowconnect.com>:
* Support for sysfs included.
*/
#include <linux/module.h>
#include <linux/i2o.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/sched.h> /* wait_event_interruptible_timeout() needs this */
#include <asm/param.h> /* HZ */
#include "core.h"
#define OSM_NAME "exec-osm"
struct i2o_driver i2o_exec_driver;
/* global wait list for POST WAIT */
static LIST_HEAD(i2o_exec_wait_list);
/* Wait struct needed for POST WAIT */
struct i2o_exec_wait {
wait_queue_head_t *wq; /* Pointer to Wait queue */
struct i2o_dma dma; /* DMA buffers to free on failure */
u32 tcntxt; /* transaction context from reply */
int complete; /* 1 if reply received otherwise 0 */
u32 m; /* message id */
struct i2o_message *msg; /* pointer to the reply message */
struct list_head list; /* node in global wait list */
spinlock_t lock; /* lock before modifying */
};
/* Work struct needed to handle LCT NOTIFY replies */
struct i2o_exec_lct_notify_work {
struct work_struct work; /* work struct */
struct i2o_controller *c; /* controller on which the LCT NOTIFY
was received */
};
/* Exec OSM class handling definition */
static struct i2o_class_id i2o_exec_class_id[] = {
{I2O_CLASS_EXECUTIVE},
{I2O_CLASS_END}
};
/**
* i2o_exec_wait_alloc - Allocate a i2o_exec_wait struct an initialize it
*
* Allocate the i2o_exec_wait struct and initialize the wait.
*
* Returns i2o_exec_wait pointer on success or negative error code on
* failure.
*/
static struct i2o_exec_wait *i2o_exec_wait_alloc(void)
{
struct i2o_exec_wait *wait;
wait = kzalloc(sizeof(*wait), GFP_KERNEL);
if (!wait)
return NULL;
INIT_LIST_HEAD(&wait->list);
spin_lock_init(&wait->lock);
return wait;
};
/**
* i2o_exec_wait_free - Free an i2o_exec_wait struct
* @wait: I2O wait data which should be cleaned up
*/
static void i2o_exec_wait_free(struct i2o_exec_wait *wait)
{
kfree(wait);
};
/**
* i2o_msg_post_wait_mem - Post and wait a message with DMA buffers
* @c: controller
* @msg: message to post
* @timeout: time in seconds to wait
* @dma: i2o_dma struct of the DMA buffer to free on failure
*
* This API allows an OSM to post a message and then be told whether or
* not the system received a successful reply. If the message times out
* then the value '-ETIMEDOUT' is returned. This is a special case. In
* this situation the message may (should) complete at an indefinite time
* in the future. When it completes it will use the memory buffer
* attached to the request. If -ETIMEDOUT is returned then the memory
* buffer must not be freed. Instead the event completion will free them
* for you. In all other cases the buffer are your problem.
*
* Returns 0 on success, negative error code on timeout or positive error
* code from reply.
*/
int i2o_msg_post_wait_mem(struct i2o_controller *c, struct i2o_message *msg,
unsigned long timeout, struct i2o_dma *dma)
{
DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
struct i2o_exec_wait *wait;
static u32 tcntxt = 0x80000000;
unsigned long flags;
int rc = 0;
wait = i2o_exec_wait_alloc();
if (!wait) {
i2o_msg_nop(c, msg);
return -ENOMEM;
}
if (tcntxt == 0xffffffff)
tcntxt = 0x80000000;
if (dma)
wait->dma = *dma;
/*
* Fill in the message initiator context and transaction context.
* We will only use transaction contexts >= 0x80000000 for POST WAIT,
* so we could find a POST WAIT reply easier in the reply handler.
*/
msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
wait->tcntxt = tcntxt++;
msg->u.s.tcntxt = cpu_to_le32(wait->tcntxt);
wait->wq = &wq;
/*
* we add elements to the head, because if a entry in the list will
* never be removed, we have to iterate over it every time
*/
list_add(&wait->list, &i2o_exec_wait_list);
/*
* Post the message to the controller. At some point later it will
* return. If we time out before it returns then complete will be zero.
*/
i2o_msg_post(c, msg);
wait_event_interruptible_timeout(wq, wait->complete, timeout * HZ);
spin_lock_irqsave(&wait->lock, flags);
wait->wq = NULL;
if (wait->complete)
rc = le32_to_cpu(wait->msg->body[0]) >> 24;
else {
/*
* We cannot remove it now. This is important. When it does
* terminate (which it must do if the controller has not
* died...) then it will otherwise scribble on stuff.
*
* FIXME: try abort message
*/
if (dma)
dma->virt = NULL;
rc = -ETIMEDOUT;
}
spin_unlock_irqrestore(&wait->lock, flags);
if (rc != -ETIMEDOUT) {
i2o_flush_reply(c, wait->m);
i2o_exec_wait_free(wait);
}
return rc;
};
/**
* i2o_msg_post_wait_complete - Reply to a i2o_msg_post request from IOP
* @c: I2O controller which answers
* @m: message id
* @msg: pointer to the I2O reply message
* @context: transaction context of request
*
* This function is called in interrupt context only. If the reply reached
* before the timeout, the i2o_exec_wait struct is filled with the message
* and the task will be waked up. The task is now responsible for returning
* the message m back to the controller! If the message reaches us after
* the timeout clean up the i2o_exec_wait struct (including allocated
* DMA buffer).
*
* Return 0 on success and if the message m should not be given back to the
* I2O controller, or >0 on success and if the message should be given back
* afterwords. Returns negative error code on failure. In this case the
* message must also be given back to the controller.
*/
static int i2o_msg_post_wait_complete(struct i2o_controller *c, u32 m,
struct i2o_message *msg, u32 context)
{
struct i2o_exec_wait *wait, *tmp;
unsigned long flags;
int rc = 1;
/*
* We need to search through the i2o_exec_wait_list to see if the given
* message is still outstanding. If not, it means that the IOP took
* longer to respond to the message than we had allowed and timer has
* already expired. Not much we can do about that except log it for
* debug purposes, increase timeout, and recompile.
*/
list_for_each_entry_safe(wait, tmp, &i2o_exec_wait_list, list) {
if (wait->tcntxt == context) {
spin_lock_irqsave(&wait->lock, flags);
list_del(&wait->list);
wait->m = m;
wait->msg = msg;
wait->complete = 1;
if (wait->wq)
rc = 0;
else
rc = -1;
spin_unlock_irqrestore(&wait->lock, flags);
if (rc) {
struct device *dev;
dev = &c->pdev->dev;
pr_debug("%s: timedout reply received!\n",
c->name);
i2o_dma_free(dev, &wait->dma);
i2o_exec_wait_free(wait);
} else
wake_up_interruptible(wait->wq);
return rc;
}
}
osm_warn("%s: Bogus reply in POST WAIT (tr-context: %08x)!\n", c->name,
context);
return -1;
};
/**
* i2o_exec_show_vendor_id - Displays Vendor ID of controller
* @d: device of which the Vendor ID should be displayed
* @attr: device_attribute to display
* @buf: buffer into which the Vendor ID should be printed
*
* Returns number of bytes printed into buffer.
*/
static ssize_t i2o_exec_show_vendor_id(struct device *d,
struct device_attribute *attr, char *buf)
{
struct i2o_device *dev = to_i2o_device(d);
u16 id;
if (!i2o_parm_field_get(dev, 0x0000, 0, &id, 2)) {
sprintf(buf, "0x%04x", le16_to_cpu(id));
return strlen(buf) + 1;
}
return 0;
};
/**
* i2o_exec_show_product_id - Displays Product ID of controller
* @d: device of which the Product ID should be displayed
* @attr: device_attribute to display
* @buf: buffer into which the Product ID should be printed
*
* Returns number of bytes printed into buffer.
*/
static ssize_t i2o_exec_show_product_id(struct device *d,
struct device_attribute *attr,
char *buf)
{
struct i2o_device *dev = to_i2o_device(d);
u16 id;
if (!i2o_parm_field_get(dev, 0x0000, 1, &id, 2)) {
sprintf(buf, "0x%04x", le16_to_cpu(id));
return strlen(buf) + 1;
}
return 0;
};
/* Exec-OSM device attributes */
static DEVICE_ATTR(vendor_id, S_IRUGO, i2o_exec_show_vendor_id, NULL);
static DEVICE_ATTR(product_id, S_IRUGO, i2o_exec_show_product_id, NULL);
/**
* i2o_exec_probe - Called if a new I2O device (executive class) appears
* @dev: I2O device which should be probed
*
* Registers event notification for every event from Executive device. The
* return is always 0, because we want all devices of class Executive.
*
* Returns 0 on success.
*/
static int i2o_exec_probe(struct device *dev)
{
struct i2o_device *i2o_dev = to_i2o_device(dev);
int rc;
rc = i2o_event_register(i2o_dev, &i2o_exec_driver, 0, 0xffffffff);
if (rc) goto err_out;
rc = device_create_file(dev, &dev_attr_vendor_id);
if (rc) goto err_evtreg;
rc = device_create_file(dev, &dev_attr_product_id);
if (rc) goto err_vid;
i2o_dev->iop->exec = i2o_dev;
return 0;
err_vid:
device_remove_file(dev, &dev_attr_vendor_id);
err_evtreg:
i2o_event_register(to_i2o_device(dev), &i2o_exec_driver, 0, 0);
err_out:
return rc;
};
/**
* i2o_exec_remove - Called on I2O device removal
* @dev: I2O device which was removed
*
* Unregisters event notification from Executive I2O device.
*
* Returns 0 on success.
*/
static int i2o_exec_remove(struct device *dev)
{
device_remove_file(dev, &dev_attr_product_id);
device_remove_file(dev, &dev_attr_vendor_id);
i2o_event_register(to_i2o_device(dev), &i2o_exec_driver, 0, 0);
return 0;
};
#ifdef CONFIG_I2O_LCT_NOTIFY_ON_CHANGES
/**
* i2o_exec_lct_notify - Send a asynchronus LCT NOTIFY request
* @c: I2O controller to which the request should be send
* @change_ind: change indicator
*
* This function sends a LCT NOTIFY request to the I2O controller with
* the change indicator change_ind. If the change_ind == 0 the controller
* replies immediately after the request. If change_ind > 0 the reply is
* send after change indicator of the LCT is > change_ind.
*/
static int i2o_exec_lct_notify(struct i2o_controller *c, u32 change_ind)
{
i2o_status_block *sb = c->status_block.virt;
struct device *dev;
struct i2o_message *msg;
mutex_lock(&c->lct_lock);
dev = &c->pdev->dev;
if (i2o_dma_realloc(dev, &c->dlct,
le32_to_cpu(sb->expected_lct_size)))
return -ENOMEM;
msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
if (IS_ERR(msg))
return PTR_ERR(msg);
msg->u.head[0] = cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6);
msg->u.head[1] = cpu_to_le32(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 |
ADAPTER_TID);
msg->u.s.icntxt = cpu_to_le32(i2o_exec_driver.context);
msg->u.s.tcntxt = cpu_to_le32(0x00000000);
msg->body[0] = cpu_to_le32(0xffffffff);
msg->body[1] = cpu_to_le32(change_ind);
msg->body[2] = cpu_to_le32(0xd0000000 | c->dlct.len);
msg->body[3] = cpu_to_le32(c->dlct.phys);
i2o_msg_post(c, msg);
mutex_unlock(&c->lct_lock);
return 0;
}
#endif
/**
* i2o_exec_lct_modified - Called on LCT NOTIFY reply
* @_work: work struct for a specific controller
*
* This function handles asynchronus LCT NOTIFY replies. It parses the
* new LCT and if the buffer for the LCT was to small sends a LCT NOTIFY
* again, otherwise send LCT NOTIFY to get informed on next LCT change.
*/
static void i2o_exec_lct_modified(struct work_struct *_work)
{
struct i2o_exec_lct_notify_work *work =
container_of(_work, struct i2o_exec_lct_notify_work, work);
u32 change_ind = 0;
struct i2o_controller *c = work->c;
kfree(work);
if (i2o_device_parse_lct(c) != -EAGAIN)
change_ind = c->lct->change_ind + 1;
#ifdef CONFIG_I2O_LCT_NOTIFY_ON_CHANGES
i2o_exec_lct_notify(c, change_ind);
#endif
};
/**
* i2o_exec_reply - I2O Executive reply handler
* @c: I2O controller from which the reply comes
* @m: message id
* @msg: pointer to the I2O reply message
*
* This function is always called from interrupt context. If a POST WAIT
* reply was received, pass it to the complete function. If a LCT NOTIFY
* reply was received, a new event is created to handle the update.
*
* Returns 0 on success and if the reply should not be flushed or > 0
* on success and if the reply should be flushed. Returns negative error
* code on failure and if the reply should be flushed.
*/
static int i2o_exec_reply(struct i2o_controller *c, u32 m,
struct i2o_message *msg)
{
u32 context;
if (le32_to_cpu(msg->u.head[0]) & MSG_FAIL) {
struct i2o_message __iomem *pmsg;
u32 pm;
/*
* If Fail bit is set we must take the transaction context of
* the preserved message to find the right request again.
*/
pm = le32_to_cpu(msg->body[3]);
pmsg = i2o_msg_in_to_virt(c, pm);
context = readl(&pmsg->u.s.tcntxt);
i2o_report_status(KERN_INFO, "i2o_core", msg);
/* Release the preserved msg */
i2o_msg_nop_mfa(c, pm);
} else
context = le32_to_cpu(msg->u.s.tcntxt);
if (context & 0x80000000)
return i2o_msg_post_wait_complete(c, m, msg, context);
if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_LCT_NOTIFY) {
struct i2o_exec_lct_notify_work *work;
pr_debug("%s: LCT notify received\n", c->name);
work = kmalloc(sizeof(*work), GFP_ATOMIC);
if (!work)
return -ENOMEM;
work->c = c;
INIT_WORK(&work->work, i2o_exec_lct_modified);
queue_work(i2o_exec_driver.event_queue, &work->work);
return 1;
}
/*
* If this happens, we want to dump the message to the syslog so
* it can be sent back to the card manufacturer by the end user
* to aid in debugging.
*
*/
printk(KERN_WARNING "%s: Unsolicited message reply sent to core!"
"Message dumped to syslog\n", c->name);
i2o_dump_message(msg);
return -EFAULT;
}
/**
* i2o_exec_event - Event handling function
* @work: Work item in occurring event
*
* Handles events send by the Executive device. At the moment does not do
* anything useful.
*/
static void i2o_exec_event(struct work_struct *work)
{
struct i2o_event *evt = container_of(work, struct i2o_event, work);
if (likely(evt->i2o_dev))
osm_debug("Event received from device: %d\n",
evt->i2o_dev->lct_data.tid);
kfree(evt);
};
/**
* i2o_exec_lct_get - Get the IOP's Logical Configuration Table
* @c: I2O controller from which the LCT should be fetched
*
* Send a LCT NOTIFY request to the controller, and wait
* I2O_TIMEOUT_LCT_GET seconds until arrival of response. If the LCT is
* to large, retry it.
*
* Returns 0 on success or negative error code on failure.
*/
int i2o_exec_lct_get(struct i2o_controller *c)
{
struct i2o_message *msg;
int i = 0;
int rc = -EAGAIN;
for (i = 1; i <= I2O_LCT_GET_TRIES; i++) {
msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
if (IS_ERR(msg))
return PTR_ERR(msg);
msg->u.head[0] =
cpu_to_le32(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6);
msg->u.head[1] =
cpu_to_le32(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 |
ADAPTER_TID);
msg->body[0] = cpu_to_le32(0xffffffff);
msg->body[1] = cpu_to_le32(0x00000000);
msg->body[2] = cpu_to_le32(0xd0000000 | c->dlct.len);
msg->body[3] = cpu_to_le32(c->dlct.phys);
rc = i2o_msg_post_wait(c, msg, I2O_TIMEOUT_LCT_GET);
if (rc < 0)
break;
rc = i2o_device_parse_lct(c);
if (rc != -EAGAIN)
break;
}
return rc;
}
/* Exec OSM driver struct */
struct i2o_driver i2o_exec_driver = {
.name = OSM_NAME,
.reply = i2o_exec_reply,
.event = i2o_exec_event,
.classes = i2o_exec_class_id,
.driver = {
.probe = i2o_exec_probe,
.remove = i2o_exec_remove,
},
};
/**
* i2o_exec_init - Registers the Exec OSM
*
* Registers the Exec OSM in the I2O core.
*
* Returns 0 on success or negative error code on failure.
*/
int __init i2o_exec_init(void)
{
return i2o_driver_register(&i2o_exec_driver);
};
/**
* i2o_exec_exit - Removes the Exec OSM
*
* Unregisters the Exec OSM from the I2O core.
*/
void i2o_exec_exit(void)
{
i2o_driver_unregister(&i2o_exec_driver);
};
EXPORT_SYMBOL(i2o_msg_post_wait_mem);
EXPORT_SYMBOL(i2o_exec_lct_get);