Linux-2.6.12-rc2
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!
This commit is contained in:
Linus Torvalds
507
drivers/message/i2o/exec-osm.c
Normal file
507
drivers/message/i2o/exec-osm.c
Normal file
@@ -0,0 +1,507 @@
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/*
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* Executive OSM
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*
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* Copyright (C) 1999-2002 Red Hat Software
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*
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* Written by Alan Cox, Building Number Three Ltd
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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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* A lot of the I2O message side code from this is taken from the Red
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* Creek RCPCI45 adapter driver by Red Creek Communications
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*
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* Fixes/additions:
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* Philipp Rumpf
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* Juha Siev<65>nen <Juha.Sievanen@cs.Helsinki.FI>
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* Auvo H<>kkinen <Auvo.Hakkinen@cs.Helsinki.FI>
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* Deepak Saxena <deepak@plexity.net>
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* Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
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* Alan Cox <alan@redhat.com>:
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* Ported to Linux 2.5.
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* Markus Lidel <Markus.Lidel@shadowconnect.com>:
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* Minor fixes for 2.6.
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* Markus Lidel <Markus.Lidel@shadowconnect.com>:
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* Support for sysfs included.
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*/
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#include <linux/module.h>
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#include <linux/i2o.h>
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#include <linux/delay.h>
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#define OSM_NAME "exec-osm"
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struct i2o_driver i2o_exec_driver;
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static int i2o_exec_lct_notify(struct i2o_controller *c, u32 change_ind);
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/* Module internal functions from other sources */
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extern int i2o_device_parse_lct(struct i2o_controller *);
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/* global wait list for POST WAIT */
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static LIST_HEAD(i2o_exec_wait_list);
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/* Wait struct needed for POST WAIT */
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struct i2o_exec_wait {
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wait_queue_head_t *wq; /* Pointer to Wait queue */
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struct i2o_dma dma; /* DMA buffers to free on failure */
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u32 tcntxt; /* transaction context from reply */
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int complete; /* 1 if reply received otherwise 0 */
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u32 m; /* message id */
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struct i2o_message __iomem *msg; /* pointer to the reply message */
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struct list_head list; /* node in global wait list */
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};
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/* Exec OSM class handling definition */
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static struct i2o_class_id i2o_exec_class_id[] = {
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{I2O_CLASS_EXECUTIVE},
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{I2O_CLASS_END}
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};
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/**
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* i2o_exec_wait_alloc - Allocate a i2o_exec_wait struct an initialize it
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*
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* Allocate the i2o_exec_wait struct and initialize the wait.
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*
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* Returns i2o_exec_wait pointer on success or negative error code on
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* failure.
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*/
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static struct i2o_exec_wait *i2o_exec_wait_alloc(void)
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{
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struct i2o_exec_wait *wait;
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wait = kmalloc(sizeof(*wait), GFP_KERNEL);
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if (!wait)
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return ERR_PTR(-ENOMEM);
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memset(wait, 0, sizeof(*wait));
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INIT_LIST_HEAD(&wait->list);
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return wait;
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};
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/**
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* i2o_exec_wait_free - Free a i2o_exec_wait struct
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* @i2o_exec_wait: I2O wait data which should be cleaned up
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*/
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static void i2o_exec_wait_free(struct i2o_exec_wait *wait)
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{
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kfree(wait);
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};
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/**
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* i2o_msg_post_wait_mem - Post and wait a message with DMA buffers
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* @c: controller
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* @m: message to post
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* @timeout: time in seconds to wait
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* @dma: i2o_dma struct of the DMA buffer to free on failure
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*
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* This API allows an OSM to post a message and then be told whether or
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* not the system received a successful reply. If the message times out
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* then the value '-ETIMEDOUT' is returned. This is a special case. In
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* this situation the message may (should) complete at an indefinite time
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* in the future. When it completes it will use the memory buffer
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* attached to the request. If -ETIMEDOUT is returned then the memory
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* buffer must not be freed. Instead the event completion will free them
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* for you. In all other cases the buffer are your problem.
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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_msg_post_wait_mem(struct i2o_controller *c, u32 m, unsigned long
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timeout, struct i2o_dma *dma)
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{
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DECLARE_WAIT_QUEUE_HEAD(wq);
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struct i2o_exec_wait *wait;
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static u32 tcntxt = 0x80000000;
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struct i2o_message __iomem *msg = c->in_queue.virt + m;
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int rc = 0;
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wait = i2o_exec_wait_alloc();
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if (!wait)
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return -ENOMEM;
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if (tcntxt == 0xffffffff)
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tcntxt = 0x80000000;
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if (dma)
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wait->dma = *dma;
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/*
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* Fill in the message initiator context and transaction context.
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* We will only use transaction contexts >= 0x80000000 for POST WAIT,
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* so we could find a POST WAIT reply easier in the reply handler.
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*/
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writel(i2o_exec_driver.context, &msg->u.s.icntxt);
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wait->tcntxt = tcntxt++;
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writel(wait->tcntxt, &msg->u.s.tcntxt);
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/*
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* Post the message to the controller. At some point later it will
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* return. If we time out before it returns then complete will be zero.
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*/
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i2o_msg_post(c, m);
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if (!wait->complete) {
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wait->wq = &wq;
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/*
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* we add elements add the head, because if a entry in the list
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* will never be removed, we have to iterate over it every time
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*/
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list_add(&wait->list, &i2o_exec_wait_list);
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wait_event_interruptible_timeout(wq, wait->complete,
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timeout * HZ);
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wait->wq = NULL;
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}
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barrier();
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if (wait->complete) {
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if (readl(&wait->msg->body[0]) >> 24)
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rc = readl(&wait->msg->body[0]) & 0xff;
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i2o_flush_reply(c, wait->m);
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i2o_exec_wait_free(wait);
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} else {
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/*
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* We cannot remove it now. This is important. When it does
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* terminate (which it must do if the controller has not
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* died...) then it will otherwise scribble on stuff.
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*
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* FIXME: try abort message
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*/
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if (dma)
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dma->virt = NULL;
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rc = -ETIMEDOUT;
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}
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return rc;
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};
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/**
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* i2o_msg_post_wait_complete - Reply to a i2o_msg_post request from IOP
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* @c: I2O controller which answers
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* @m: message id
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* @msg: pointer to the I2O reply message
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*
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* This function is called in interrupt context only. If the reply reached
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* before the timeout, the i2o_exec_wait struct is filled with the message
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* and the task will be waked up. The task is now responsible for returning
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* the message m back to the controller! If the message reaches us after
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* the timeout clean up the i2o_exec_wait struct (including allocated
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* DMA buffer).
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*
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* Return 0 on success and if the message m should not be given back to the
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* I2O controller, or >0 on success and if the message should be given back
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* afterwords. Returns negative error code on failure. In this case the
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* message must also be given back to the controller.
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*/
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static int i2o_msg_post_wait_complete(struct i2o_controller *c, u32 m,
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struct i2o_message __iomem *msg)
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{
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struct i2o_exec_wait *wait, *tmp;
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static spinlock_t lock;
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int rc = 1;
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u32 context;
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spin_lock_init(&lock);
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context = readl(&msg->u.s.tcntxt);
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/*
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* We need to search through the i2o_exec_wait_list to see if the given
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* message is still outstanding. If not, it means that the IOP took
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* longer to respond to the message than we had allowed and timer has
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* already expired. Not much we can do about that except log it for
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* debug purposes, increase timeout, and recompile.
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*/
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spin_lock(&lock);
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list_for_each_entry_safe(wait, tmp, &i2o_exec_wait_list, list) {
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if (wait->tcntxt == context) {
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list_del(&wait->list);
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wait->m = m;
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wait->msg = msg;
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wait->complete = 1;
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barrier();
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if (wait->wq) {
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wake_up_interruptible(wait->wq);
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rc = 0;
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} else {
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struct device *dev;
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dev = &c->pdev->dev;
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pr_debug("%s: timedout reply received!\n",
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c->name);
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i2o_dma_free(dev, &wait->dma);
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i2o_exec_wait_free(wait);
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rc = -1;
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}
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spin_unlock(&lock);
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return rc;
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}
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}
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spin_unlock(&lock);
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pr_debug("%s: Bogus reply in POST WAIT (tr-context: %08x)!\n", c->name,
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context);
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return -1;
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};
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/**
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* i2o_exec_probe - Called if a new I2O device (executive class) appears
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* @dev: I2O device which should be probed
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*
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* Registers event notification for every event from Executive device. The
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* return is always 0, because we want all devices of class Executive.
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*
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* Returns 0 on success.
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*/
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static int i2o_exec_probe(struct device *dev)
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{
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struct i2o_device *i2o_dev = to_i2o_device(dev);
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i2o_event_register(i2o_dev, &i2o_exec_driver, 0, 0xffffffff);
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i2o_dev->iop->exec = i2o_dev;
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return 0;
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};
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/**
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* i2o_exec_remove - Called on I2O device removal
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* @dev: I2O device which was removed
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*
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* Unregisters event notification from Executive I2O device.
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*
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* Returns 0 on success.
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*/
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static int i2o_exec_remove(struct device *dev)
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{
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i2o_event_register(to_i2o_device(dev), &i2o_exec_driver, 0, 0);
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return 0;
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};
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/**
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* i2o_exec_lct_modified - Called on LCT NOTIFY reply
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* @c: I2O controller on which the LCT has modified
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*
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* This function handles asynchronus LCT NOTIFY replies. It parses the
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* new LCT and if the buffer for the LCT was to small sends a LCT NOTIFY
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* again.
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*/
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static void i2o_exec_lct_modified(struct i2o_controller *c)
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{
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if (i2o_device_parse_lct(c) == -EAGAIN)
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i2o_exec_lct_notify(c, 0);
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};
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/**
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* i2o_exec_reply - I2O Executive reply handler
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* @c: I2O controller from which the reply comes
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* @m: message id
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* @msg: pointer to the I2O reply message
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*
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* This function is always called from interrupt context. If a POST WAIT
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* reply was received, pass it to the complete function. If a LCT NOTIFY
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* reply was received, a new event is created to handle the update.
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*
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* Returns 0 on success and if the reply should not be flushed or > 0
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* on success and if the reply should be flushed. Returns negative error
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* code on failure and if the reply should be flushed.
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*/
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static int i2o_exec_reply(struct i2o_controller *c, u32 m,
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struct i2o_message *msg)
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{
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if (le32_to_cpu(msg->u.head[0]) & MSG_FAIL) { // Fail bit is set
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struct i2o_message __iomem *pmsg; /* preserved message */
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u32 pm;
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pm = le32_to_cpu(msg->body[3]);
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pmsg = i2o_msg_in_to_virt(c, pm);
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i2o_report_status(KERN_INFO, "i2o_core", msg);
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/* Release the preserved msg by resubmitting it as a NOP */
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i2o_msg_nop(c, pm);
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/* If reply to i2o_post_wait failed, return causes a timeout */
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return -1;
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}
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if (le32_to_cpu(msg->u.s.tcntxt) & 0x80000000)
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return i2o_msg_post_wait_complete(c, m, msg);
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if ((le32_to_cpu(msg->u.head[1]) >> 24) == I2O_CMD_LCT_NOTIFY) {
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struct work_struct *work;
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pr_debug("%s: LCT notify received\n", c->name);
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work = kmalloc(sizeof(*work), GFP_ATOMIC);
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if (!work)
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return -ENOMEM;
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INIT_WORK(work, (void (*)(void *))i2o_exec_lct_modified, c);
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queue_work(i2o_exec_driver.event_queue, work);
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return 1;
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}
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/*
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* If this happens, we want to dump the message to the syslog so
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* it can be sent back to the card manufacturer by the end user
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* to aid in debugging.
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*
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*/
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printk(KERN_WARNING "%s: Unsolicited message reply sent to core!"
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"Message dumped to syslog\n", c->name);
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i2o_dump_message(msg);
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return -EFAULT;
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}
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/**
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* i2o_exec_event - Event handling function
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* @evt: Event which occurs
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*
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* Handles events send by the Executive device. At the moment does not do
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* anything useful.
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*/
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static void i2o_exec_event(struct i2o_event *evt)
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{
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osm_info("Event received from device: %d\n",
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evt->i2o_dev->lct_data.tid);
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kfree(evt);
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};
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/**
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* i2o_exec_lct_get - Get the IOP's Logical Configuration Table
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* @c: I2O controller from which the LCT should be fetched
|
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*
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* Send a LCT NOTIFY request to the controller, and wait
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* I2O_TIMEOUT_LCT_GET seconds until arrival of response. If the LCT is
|
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* to large, retry it.
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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_exec_lct_get(struct i2o_controller *c)
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{
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struct i2o_message __iomem *msg;
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u32 m;
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int i = 0;
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int rc = -EAGAIN;
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for (i = 1; i <= I2O_LCT_GET_TRIES; i++) {
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m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
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if (m == I2O_QUEUE_EMPTY)
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return -ETIMEDOUT;
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writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6, &msg->u.head[0]);
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writel(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 | ADAPTER_TID,
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&msg->u.head[1]);
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writel(0xffffffff, &msg->body[0]);
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writel(0x00000000, &msg->body[1]);
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writel(0xd0000000 | c->dlct.len, &msg->body[2]);
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writel(c->dlct.phys, &msg->body[3]);
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rc = i2o_msg_post_wait(c, m, I2O_TIMEOUT_LCT_GET);
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if (rc < 0)
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break;
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rc = i2o_device_parse_lct(c);
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if (rc != -EAGAIN)
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break;
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||||
}
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||||
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return rc;
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}
|
||||
|
||||
/**
|
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* 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 __iomem *msg;
|
||||
u32 m;
|
||||
|
||||
dev = &c->pdev->dev;
|
||||
|
||||
if (i2o_dma_realloc(dev, &c->dlct, sb->expected_lct_size, GFP_KERNEL))
|
||||
return -ENOMEM;
|
||||
|
||||
m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
|
||||
if (m == I2O_QUEUE_EMPTY)
|
||||
return -ETIMEDOUT;
|
||||
|
||||
writel(EIGHT_WORD_MSG_SIZE | SGL_OFFSET_6, &msg->u.head[0]);
|
||||
writel(I2O_CMD_LCT_NOTIFY << 24 | HOST_TID << 12 | ADAPTER_TID,
|
||||
&msg->u.head[1]);
|
||||
writel(i2o_exec_driver.context, &msg->u.s.icntxt);
|
||||
writel(0, &msg->u.s.tcntxt); /* FIXME */
|
||||
writel(0xffffffff, &msg->body[0]);
|
||||
writel(change_ind, &msg->body[1]);
|
||||
writel(0xd0000000 | c->dlct.len, &msg->body[2]);
|
||||
writel(c->dlct.phys, &msg->body[3]);
|
||||
|
||||
i2o_msg_post(c, m);
|
||||
|
||||
return 0;
|
||||
};
|
||||
|
||||
/* 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 __exit i2o_exec_exit(void)
|
||||
{
|
||||
i2o_driver_unregister(&i2o_exec_driver);
|
||||
};
|
||||
|
||||
EXPORT_SYMBOL(i2o_msg_post_wait_mem);
|
||||
EXPORT_SYMBOL(i2o_exec_lct_get);
|
||||
Reference in New Issue
Block a user