+++ /dev/null
-/* krxiod.c: Rx I/O daemon
- *
- * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.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.
- */
-
-#include <linux/sched.h>
-#include <linux/completion.h>
-#include <linux/spinlock.h>
-#include <linux/init.h>
-#include <linux/freezer.h>
-#include <rxrpc/krxiod.h>
-#include <rxrpc/transport.h>
-#include <rxrpc/peer.h>
-#include <rxrpc/call.h>
-#include "internal.h"
-
-static DECLARE_WAIT_QUEUE_HEAD(rxrpc_krxiod_sleepq);
-static DECLARE_COMPLETION(rxrpc_krxiod_dead);
-
-static atomic_t rxrpc_krxiod_qcount = ATOMIC_INIT(0);
-
-static LIST_HEAD(rxrpc_krxiod_transportq);
-static DEFINE_SPINLOCK(rxrpc_krxiod_transportq_lock);
-
-static LIST_HEAD(rxrpc_krxiod_callq);
-static DEFINE_SPINLOCK(rxrpc_krxiod_callq_lock);
-
-static volatile int rxrpc_krxiod_die;
-
-/*****************************************************************************/
-/*
- * Rx I/O daemon
- */
-static int rxrpc_krxiod(void *arg)
-{
- DECLARE_WAITQUEUE(krxiod,current);
-
- printk("Started krxiod %d\n",current->pid);
-
- daemonize("krxiod");
-
- /* loop around waiting for work to do */
- do {
- /* wait for work or to be told to exit */
- _debug("### Begin Wait");
- if (!atomic_read(&rxrpc_krxiod_qcount)) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- add_wait_queue(&rxrpc_krxiod_sleepq, &krxiod);
-
- for (;;) {
- set_current_state(TASK_INTERRUPTIBLE);
- if (atomic_read(&rxrpc_krxiod_qcount) ||
- rxrpc_krxiod_die ||
- signal_pending(current))
- break;
-
- schedule();
- }
-
- remove_wait_queue(&rxrpc_krxiod_sleepq, &krxiod);
- set_current_state(TASK_RUNNING);
- }
- _debug("### End Wait");
-
- /* do work if been given some to do */
- _debug("### Begin Work");
-
- /* see if there's a transport in need of attention */
- if (!list_empty(&rxrpc_krxiod_transportq)) {
- struct rxrpc_transport *trans = NULL;
-
- spin_lock_irq(&rxrpc_krxiod_transportq_lock);
-
- if (!list_empty(&rxrpc_krxiod_transportq)) {
- trans = list_entry(
- rxrpc_krxiod_transportq.next,
- struct rxrpc_transport,
- krxiodq_link);
-
- list_del_init(&trans->krxiodq_link);
- atomic_dec(&rxrpc_krxiod_qcount);
-
- /* make sure it hasn't gone away and doesn't go
- * away */
- if (atomic_read(&trans->usage)>0)
- rxrpc_get_transport(trans);
- else
- trans = NULL;
- }
-
- spin_unlock_irq(&rxrpc_krxiod_transportq_lock);
-
- if (trans) {
- rxrpc_trans_receive_packet(trans);
- rxrpc_put_transport(trans);
- }
- }
-
- /* see if there's a call in need of attention */
- if (!list_empty(&rxrpc_krxiod_callq)) {
- struct rxrpc_call *call = NULL;
-
- spin_lock_irq(&rxrpc_krxiod_callq_lock);
-
- if (!list_empty(&rxrpc_krxiod_callq)) {
- call = list_entry(rxrpc_krxiod_callq.next,
- struct rxrpc_call,
- rcv_krxiodq_lk);
- list_del_init(&call->rcv_krxiodq_lk);
- atomic_dec(&rxrpc_krxiod_qcount);
-
- /* make sure it hasn't gone away and doesn't go
- * away */
- if (atomic_read(&call->usage) > 0) {
- _debug("@@@ KRXIOD"
- " Begin Attend Call %p", call);
- rxrpc_get_call(call);
- }
- else {
- call = NULL;
- }
- }
-
- spin_unlock_irq(&rxrpc_krxiod_callq_lock);
-
- if (call) {
- rxrpc_call_do_stuff(call);
- rxrpc_put_call(call);
- _debug("@@@ KRXIOD End Attend Call %p", call);
- }
- }
-
- _debug("### End Work");
-
- try_to_freeze();
-
- /* discard pending signals */
- rxrpc_discard_my_signals();
-
- } while (!rxrpc_krxiod_die);
-
- /* and that's all */
- complete_and_exit(&rxrpc_krxiod_dead, 0);
-
-} /* end rxrpc_krxiod() */
-
-/*****************************************************************************/
-/*
- * start up a krxiod daemon
- */
-int __init rxrpc_krxiod_init(void)
-{
- return kernel_thread(rxrpc_krxiod, NULL, 0);
-
-} /* end rxrpc_krxiod_init() */
-
-/*****************************************************************************/
-/*
- * kill the krxiod daemon and wait for it to complete
- */
-void rxrpc_krxiod_kill(void)
-{
- rxrpc_krxiod_die = 1;
- wake_up_all(&rxrpc_krxiod_sleepq);
- wait_for_completion(&rxrpc_krxiod_dead);
-
-} /* end rxrpc_krxiod_kill() */
-
-/*****************************************************************************/
-/*
- * queue a transport for attention by krxiod
- */
-void rxrpc_krxiod_queue_transport(struct rxrpc_transport *trans)
-{
- unsigned long flags;
-
- _enter("");
-
- if (list_empty(&trans->krxiodq_link)) {
- spin_lock_irqsave(&rxrpc_krxiod_transportq_lock, flags);
-
- if (list_empty(&trans->krxiodq_link)) {
- if (atomic_read(&trans->usage) > 0) {
- list_add_tail(&trans->krxiodq_link,
- &rxrpc_krxiod_transportq);
- atomic_inc(&rxrpc_krxiod_qcount);
- }
- }
-
- spin_unlock_irqrestore(&rxrpc_krxiod_transportq_lock, flags);
- wake_up_all(&rxrpc_krxiod_sleepq);
- }
-
- _leave("");
-
-} /* end rxrpc_krxiod_queue_transport() */
-
-/*****************************************************************************/
-/*
- * dequeue a transport from krxiod's attention queue
- */
-void rxrpc_krxiod_dequeue_transport(struct rxrpc_transport *trans)
-{
- unsigned long flags;
-
- _enter("");
-
- spin_lock_irqsave(&rxrpc_krxiod_transportq_lock, flags);
- if (!list_empty(&trans->krxiodq_link)) {
- list_del_init(&trans->krxiodq_link);
- atomic_dec(&rxrpc_krxiod_qcount);
- }
- spin_unlock_irqrestore(&rxrpc_krxiod_transportq_lock, flags);
-
- _leave("");
-
-} /* end rxrpc_krxiod_dequeue_transport() */
-
-/*****************************************************************************/
-/*
- * queue a call for attention by krxiod
- */
-void rxrpc_krxiod_queue_call(struct rxrpc_call *call)
-{
- unsigned long flags;
-
- if (list_empty(&call->rcv_krxiodq_lk)) {
- spin_lock_irqsave(&rxrpc_krxiod_callq_lock, flags);
- if (atomic_read(&call->usage) > 0) {
- list_add_tail(&call->rcv_krxiodq_lk,
- &rxrpc_krxiod_callq);
- atomic_inc(&rxrpc_krxiod_qcount);
- }
- spin_unlock_irqrestore(&rxrpc_krxiod_callq_lock, flags);
- }
- wake_up_all(&rxrpc_krxiod_sleepq);
-
-} /* end rxrpc_krxiod_queue_call() */
-
-/*****************************************************************************/
-/*
- * dequeue a call from krxiod's attention queue
- */
-void rxrpc_krxiod_dequeue_call(struct rxrpc_call *call)
-{
- unsigned long flags;
-
- spin_lock_irqsave(&rxrpc_krxiod_callq_lock, flags);
- if (!list_empty(&call->rcv_krxiodq_lk)) {
- list_del_init(&call->rcv_krxiodq_lk);
- atomic_dec(&rxrpc_krxiod_qcount);
- }
- spin_unlock_irqrestore(&rxrpc_krxiod_callq_lock, flags);
-
-} /* end rxrpc_krxiod_dequeue_call() */
projects / powerpc.git / blobdiff