1359 lines
36 KiB
C
1359 lines
36 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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* Cross Partition Communication (XPC) channel support.
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*
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* This is the part of XPC that manages the channels and
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* sends/receives messages across them to/from other partitions.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/cache.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/completion.h>
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#include <asm/sn/sn_sal.h>
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#include "xpc.h"
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/*
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* Guarantee that the kzalloc'd memory is cacheline aligned.
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*/
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void *
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xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
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{
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/* see if kzalloc will give us cachline aligned memory by default */
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*base = kzalloc(size, flags);
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if (*base == NULL)
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return NULL;
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if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
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return *base;
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kfree(*base);
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/* nope, we'll have to do it ourselves */
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*base = kzalloc(size + L1_CACHE_BYTES, flags);
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if (*base == NULL)
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return NULL;
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return (void *)L1_CACHE_ALIGN((u64)*base);
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}
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/*
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* Allocate the local message queue and the notify queue.
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*/
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static enum xp_retval
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xpc_allocate_local_msgqueue(struct xpc_channel *ch)
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{
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unsigned long irq_flags;
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int nentries;
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size_t nbytes;
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for (nentries = ch->local_nentries; nentries > 0; nentries--) {
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nbytes = nentries * ch->msg_size;
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ch->local_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
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GFP_KERNEL,
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&ch->local_msgqueue_base);
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if (ch->local_msgqueue == NULL)
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continue;
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nbytes = nentries * sizeof(struct xpc_notify);
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ch->notify_queue = kzalloc(nbytes, GFP_KERNEL);
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if (ch->notify_queue == NULL) {
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kfree(ch->local_msgqueue_base);
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ch->local_msgqueue = NULL;
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continue;
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}
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spin_lock_irqsave(&ch->lock, irq_flags);
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if (nentries < ch->local_nentries) {
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dev_dbg(xpc_chan, "nentries=%d local_nentries=%d, "
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"partid=%d, channel=%d\n", nentries,
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ch->local_nentries, ch->partid, ch->number);
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ch->local_nentries = nentries;
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}
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spin_unlock_irqrestore(&ch->lock, irq_flags);
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return xpSuccess;
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}
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dev_dbg(xpc_chan, "can't get memory for local message queue and notify "
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"queue, partid=%d, channel=%d\n", ch->partid, ch->number);
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return xpNoMemory;
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}
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/*
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* Allocate the cached remote message queue.
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*/
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static enum xp_retval
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xpc_allocate_remote_msgqueue(struct xpc_channel *ch)
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{
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unsigned long irq_flags;
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int nentries;
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size_t nbytes;
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DBUG_ON(ch->remote_nentries <= 0);
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for (nentries = ch->remote_nentries; nentries > 0; nentries--) {
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nbytes = nentries * ch->msg_size;
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ch->remote_msgqueue = xpc_kzalloc_cacheline_aligned(nbytes,
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GFP_KERNEL,
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&ch->remote_msgqueue_base);
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if (ch->remote_msgqueue == NULL)
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continue;
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spin_lock_irqsave(&ch->lock, irq_flags);
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if (nentries < ch->remote_nentries) {
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dev_dbg(xpc_chan, "nentries=%d remote_nentries=%d, "
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"partid=%d, channel=%d\n", nentries,
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ch->remote_nentries, ch->partid, ch->number);
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ch->remote_nentries = nentries;
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}
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spin_unlock_irqrestore(&ch->lock, irq_flags);
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return xpSuccess;
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}
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dev_dbg(xpc_chan, "can't get memory for cached remote message queue, "
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"partid=%d, channel=%d\n", ch->partid, ch->number);
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return xpNoMemory;
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}
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/*
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* Allocate message queues and other stuff associated with a channel.
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*
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* Note: Assumes all of the channel sizes are filled in.
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*/
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static enum xp_retval
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xpc_allocate_msgqueues(struct xpc_channel *ch)
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{
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unsigned long irq_flags;
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enum xp_retval ret;
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DBUG_ON(ch->flags & XPC_C_SETUP);
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ret = xpc_allocate_local_msgqueue(ch);
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if (ret != xpSuccess)
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return ret;
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ret = xpc_allocate_remote_msgqueue(ch);
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if (ret != xpSuccess) {
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kfree(ch->local_msgqueue_base);
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ch->local_msgqueue = NULL;
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kfree(ch->notify_queue);
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ch->notify_queue = NULL;
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return ret;
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}
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spin_lock_irqsave(&ch->lock, irq_flags);
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ch->flags |= XPC_C_SETUP;
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spin_unlock_irqrestore(&ch->lock, irq_flags);
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return xpSuccess;
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}
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/*
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* Process a connect message from a remote partition.
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*
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* Note: xpc_process_connect() is expecting to be called with the
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* spin_lock_irqsave held and will leave it locked upon return.
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*/
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static void
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xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
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{
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enum xp_retval ret;
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DBUG_ON(!spin_is_locked(&ch->lock));
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if (!(ch->flags & XPC_C_OPENREQUEST) ||
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!(ch->flags & XPC_C_ROPENREQUEST)) {
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/* nothing more to do for now */
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return;
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}
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DBUG_ON(!(ch->flags & XPC_C_CONNECTING));
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if (!(ch->flags & XPC_C_SETUP)) {
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spin_unlock_irqrestore(&ch->lock, *irq_flags);
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ret = xpc_allocate_msgqueues(ch);
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spin_lock_irqsave(&ch->lock, *irq_flags);
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if (ret != xpSuccess)
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XPC_DISCONNECT_CHANNEL(ch, ret, irq_flags);
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if (ch->flags & (XPC_C_CONNECTED | XPC_C_DISCONNECTING))
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return;
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DBUG_ON(!(ch->flags & XPC_C_SETUP));
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DBUG_ON(ch->local_msgqueue == NULL);
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DBUG_ON(ch->remote_msgqueue == NULL);
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}
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if (!(ch->flags & XPC_C_OPENREPLY)) {
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ch->flags |= XPC_C_OPENREPLY;
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xpc_IPI_send_openreply(ch, irq_flags);
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}
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if (!(ch->flags & XPC_C_ROPENREPLY))
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return;
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DBUG_ON(ch->remote_msgqueue_pa == 0);
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ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP); /* clear all else */
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dev_info(xpc_chan, "channel %d to partition %d connected\n",
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ch->number, ch->partid);
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spin_unlock_irqrestore(&ch->lock, *irq_flags);
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xpc_create_kthreads(ch, 1, 0);
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spin_lock_irqsave(&ch->lock, *irq_flags);
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}
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/*
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* Notify those who wanted to be notified upon delivery of their message.
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*/
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static void
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xpc_notify_senders(struct xpc_channel *ch, enum xp_retval reason, s64 put)
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{
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struct xpc_notify *notify;
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u8 notify_type;
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s64 get = ch->w_remote_GP.get - 1;
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while (++get < put && atomic_read(&ch->n_to_notify) > 0) {
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notify = &ch->notify_queue[get % ch->local_nentries];
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/*
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* See if the notify entry indicates it was associated with
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* a message who's sender wants to be notified. It is possible
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* that it is, but someone else is doing or has done the
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* notification.
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*/
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notify_type = notify->type;
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if (notify_type == 0 ||
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cmpxchg(¬ify->type, notify_type, 0) != notify_type) {
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continue;
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}
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DBUG_ON(notify_type != XPC_N_CALL);
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atomic_dec(&ch->n_to_notify);
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if (notify->func != NULL) {
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dev_dbg(xpc_chan, "notify->func() called, notify=0x%p, "
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"msg_number=%ld, partid=%d, channel=%d\n",
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(void *)notify, get, ch->partid, ch->number);
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notify->func(reason, ch->partid, ch->number,
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notify->key);
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dev_dbg(xpc_chan, "notify->func() returned, "
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"notify=0x%p, msg_number=%ld, partid=%d, "
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"channel=%d\n", (void *)notify, get,
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ch->partid, ch->number);
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}
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}
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}
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/*
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* Free up message queues and other stuff that were allocated for the specified
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* channel.
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*
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* Note: ch->reason and ch->reason_line are left set for debugging purposes,
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* they're cleared when XPC_C_DISCONNECTED is cleared.
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*/
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static void
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xpc_free_msgqueues(struct xpc_channel *ch)
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{
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DBUG_ON(!spin_is_locked(&ch->lock));
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DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
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ch->remote_msgqueue_pa = 0;
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ch->func = NULL;
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ch->key = NULL;
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ch->msg_size = 0;
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ch->local_nentries = 0;
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ch->remote_nentries = 0;
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ch->kthreads_assigned_limit = 0;
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ch->kthreads_idle_limit = 0;
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ch->local_GP->get = 0;
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ch->local_GP->put = 0;
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ch->remote_GP.get = 0;
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ch->remote_GP.put = 0;
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ch->w_local_GP.get = 0;
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ch->w_local_GP.put = 0;
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ch->w_remote_GP.get = 0;
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ch->w_remote_GP.put = 0;
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ch->next_msg_to_pull = 0;
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if (ch->flags & XPC_C_SETUP) {
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ch->flags &= ~XPC_C_SETUP;
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dev_dbg(xpc_chan, "ch->flags=0x%x, partid=%d, channel=%d\n",
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ch->flags, ch->partid, ch->number);
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kfree(ch->local_msgqueue_base);
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ch->local_msgqueue = NULL;
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kfree(ch->remote_msgqueue_base);
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ch->remote_msgqueue = NULL;
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kfree(ch->notify_queue);
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ch->notify_queue = NULL;
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}
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}
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/*
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* spin_lock_irqsave() is expected to be held on entry.
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*/
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static void
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xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
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{
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struct xpc_partition *part = &xpc_partitions[ch->partid];
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u32 channel_was_connected = (ch->flags & XPC_C_WASCONNECTED);
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DBUG_ON(!spin_is_locked(&ch->lock));
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if (!(ch->flags & XPC_C_DISCONNECTING))
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return;
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DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
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/* make sure all activity has settled down first */
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if (atomic_read(&ch->kthreads_assigned) > 0 ||
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atomic_read(&ch->references) > 0) {
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return;
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}
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DBUG_ON((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
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!(ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE));
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if (part->act_state == XPC_P_DEACTIVATING) {
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/* can't proceed until the other side disengages from us */
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if (xpc_partition_engaged(1UL << ch->partid))
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return;
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} else {
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/* as long as the other side is up do the full protocol */
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if (!(ch->flags & XPC_C_RCLOSEREQUEST))
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return;
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if (!(ch->flags & XPC_C_CLOSEREPLY)) {
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ch->flags |= XPC_C_CLOSEREPLY;
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xpc_IPI_send_closereply(ch, irq_flags);
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}
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if (!(ch->flags & XPC_C_RCLOSEREPLY))
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return;
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}
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/* wake those waiting for notify completion */
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if (atomic_read(&ch->n_to_notify) > 0) {
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/* >>> we do callout while holding ch->lock */
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xpc_notify_senders(ch, ch->reason, ch->w_local_GP.put);
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}
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/* both sides are disconnected now */
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if (ch->flags & XPC_C_DISCONNECTINGCALLOUT_MADE) {
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spin_unlock_irqrestore(&ch->lock, *irq_flags);
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xpc_disconnect_callout(ch, xpDisconnected);
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spin_lock_irqsave(&ch->lock, *irq_flags);
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}
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/* it's now safe to free the channel's message queues */
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xpc_free_msgqueues(ch);
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/* mark disconnected, clear all other flags except XPC_C_WDISCONNECT */
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ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
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atomic_dec(&part->nchannels_active);
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if (channel_was_connected) {
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dev_info(xpc_chan, "channel %d to partition %d disconnected, "
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"reason=%d\n", ch->number, ch->partid, ch->reason);
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}
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if (ch->flags & XPC_C_WDISCONNECT) {
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/* we won't lose the CPU since we're holding ch->lock */
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complete(&ch->wdisconnect_wait);
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} else if (ch->delayed_IPI_flags) {
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if (part->act_state != XPC_P_DEACTIVATING) {
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/* time to take action on any delayed IPI flags */
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spin_lock(&part->IPI_lock);
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XPC_SET_IPI_FLAGS(part->local_IPI_amo, ch->number,
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ch->delayed_IPI_flags);
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spin_unlock(&part->IPI_lock);
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}
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ch->delayed_IPI_flags = 0;
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}
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}
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/*
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* Process a change in the channel's remote connection state.
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*/
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static void
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xpc_process_openclose_IPI(struct xpc_partition *part, int ch_number,
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u8 IPI_flags)
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{
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unsigned long irq_flags;
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struct xpc_openclose_args *args =
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&part->remote_openclose_args[ch_number];
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struct xpc_channel *ch = &part->channels[ch_number];
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enum xp_retval reason;
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spin_lock_irqsave(&ch->lock, irq_flags);
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again:
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if ((ch->flags & XPC_C_DISCONNECTED) &&
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(ch->flags & XPC_C_WDISCONNECT)) {
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/*
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* Delay processing IPI flags until thread waiting disconnect
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* has had a chance to see that the channel is disconnected.
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*/
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ch->delayed_IPI_flags |= IPI_flags;
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spin_unlock_irqrestore(&ch->lock, irq_flags);
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return;
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}
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if (IPI_flags & XPC_IPI_CLOSEREQUEST) {
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dev_dbg(xpc_chan, "XPC_IPI_CLOSEREQUEST (reason=%d) received "
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"from partid=%d, channel=%d\n", args->reason,
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ch->partid, ch->number);
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/*
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* If RCLOSEREQUEST is set, we're probably waiting for
|
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* RCLOSEREPLY. We should find it and a ROPENREQUEST packed
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* with this RCLOSEREQUEST in the IPI_flags.
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*/
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if (ch->flags & XPC_C_RCLOSEREQUEST) {
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DBUG_ON(!(ch->flags & XPC_C_DISCONNECTING));
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DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
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DBUG_ON(!(ch->flags & XPC_C_CLOSEREPLY));
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DBUG_ON(ch->flags & XPC_C_RCLOSEREPLY);
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|
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DBUG_ON(!(IPI_flags & XPC_IPI_CLOSEREPLY));
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IPI_flags &= ~XPC_IPI_CLOSEREPLY;
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ch->flags |= XPC_C_RCLOSEREPLY;
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/* both sides have finished disconnecting */
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xpc_process_disconnect(ch, &irq_flags);
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DBUG_ON(!(ch->flags & XPC_C_DISCONNECTED));
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goto again;
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}
|
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|
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if (ch->flags & XPC_C_DISCONNECTED) {
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if (!(IPI_flags & XPC_IPI_OPENREQUEST)) {
|
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if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo,
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ch_number) &
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XPC_IPI_OPENREQUEST)) {
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DBUG_ON(ch->delayed_IPI_flags != 0);
|
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spin_lock(&part->IPI_lock);
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XPC_SET_IPI_FLAGS(part->local_IPI_amo,
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ch_number,
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XPC_IPI_CLOSEREQUEST);
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spin_unlock(&part->IPI_lock);
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}
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spin_unlock_irqrestore(&ch->lock, irq_flags);
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return;
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}
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|
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XPC_SET_REASON(ch, 0, 0);
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ch->flags &= ~XPC_C_DISCONNECTED;
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|
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atomic_inc(&part->nchannels_active);
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ch->flags |= (XPC_C_CONNECTING | XPC_C_ROPENREQUEST);
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}
|
|
|
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IPI_flags &= ~(XPC_IPI_OPENREQUEST | XPC_IPI_OPENREPLY);
|
|
|
|
/*
|
|
* The meaningful CLOSEREQUEST connection state fields are:
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* reason = reason connection is to be closed
|
|
*/
|
|
|
|
ch->flags |= XPC_C_RCLOSEREQUEST;
|
|
|
|
if (!(ch->flags & XPC_C_DISCONNECTING)) {
|
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reason = args->reason;
|
|
if (reason <= xpSuccess || reason > xpUnknownReason)
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|
reason = xpUnknownReason;
|
|
else if (reason == xpUnregistering)
|
|
reason = xpOtherUnregistering;
|
|
|
|
XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
|
|
|
|
DBUG_ON(IPI_flags & XPC_IPI_CLOSEREPLY);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
|
|
xpc_process_disconnect(ch, &irq_flags);
|
|
}
|
|
|
|
if (IPI_flags & XPC_IPI_CLOSEREPLY) {
|
|
|
|
dev_dbg(xpc_chan, "XPC_IPI_CLOSEREPLY received from partid=%d,"
|
|
" channel=%d\n", ch->partid, ch->number);
|
|
|
|
if (ch->flags & XPC_C_DISCONNECTED) {
|
|
DBUG_ON(part->act_state != XPC_P_DEACTIVATING);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
|
|
DBUG_ON(!(ch->flags & XPC_C_CLOSEREQUEST));
|
|
|
|
if (!(ch->flags & XPC_C_RCLOSEREQUEST)) {
|
|
if ((XPC_GET_IPI_FLAGS(part->local_IPI_amo, ch_number)
|
|
& XPC_IPI_CLOSEREQUEST)) {
|
|
|
|
DBUG_ON(ch->delayed_IPI_flags != 0);
|
|
spin_lock(&part->IPI_lock);
|
|
XPC_SET_IPI_FLAGS(part->local_IPI_amo,
|
|
ch_number,
|
|
XPC_IPI_CLOSEREPLY);
|
|
spin_unlock(&part->IPI_lock);
|
|
}
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
|
|
ch->flags |= XPC_C_RCLOSEREPLY;
|
|
|
|
if (ch->flags & XPC_C_CLOSEREPLY) {
|
|
/* both sides have finished disconnecting */
|
|
xpc_process_disconnect(ch, &irq_flags);
|
|
}
|
|
}
|
|
|
|
if (IPI_flags & XPC_IPI_OPENREQUEST) {
|
|
|
|
dev_dbg(xpc_chan, "XPC_IPI_OPENREQUEST (msg_size=%d, "
|
|
"local_nentries=%d) received from partid=%d, "
|
|
"channel=%d\n", args->msg_size, args->local_nentries,
|
|
ch->partid, ch->number);
|
|
|
|
if (part->act_state == XPC_P_DEACTIVATING ||
|
|
(ch->flags & XPC_C_ROPENREQUEST)) {
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
|
|
if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_WDISCONNECT)) {
|
|
ch->delayed_IPI_flags |= XPC_IPI_OPENREQUEST;
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
DBUG_ON(!(ch->flags & (XPC_C_DISCONNECTED |
|
|
XPC_C_OPENREQUEST)));
|
|
DBUG_ON(ch->flags & (XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
|
|
XPC_C_OPENREPLY | XPC_C_CONNECTED));
|
|
|
|
/*
|
|
* The meaningful OPENREQUEST connection state fields are:
|
|
* msg_size = size of channel's messages in bytes
|
|
* local_nentries = remote partition's local_nentries
|
|
*/
|
|
if (args->msg_size == 0 || args->local_nentries == 0) {
|
|
/* assume OPENREQUEST was delayed by mistake */
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
|
|
ch->flags |= (XPC_C_ROPENREQUEST | XPC_C_CONNECTING);
|
|
ch->remote_nentries = args->local_nentries;
|
|
|
|
if (ch->flags & XPC_C_OPENREQUEST) {
|
|
if (args->msg_size != ch->msg_size) {
|
|
XPC_DISCONNECT_CHANNEL(ch, xpUnequalMsgSizes,
|
|
&irq_flags);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
} else {
|
|
ch->msg_size = args->msg_size;
|
|
|
|
XPC_SET_REASON(ch, 0, 0);
|
|
ch->flags &= ~XPC_C_DISCONNECTED;
|
|
|
|
atomic_inc(&part->nchannels_active);
|
|
}
|
|
|
|
xpc_process_connect(ch, &irq_flags);
|
|
}
|
|
|
|
if (IPI_flags & XPC_IPI_OPENREPLY) {
|
|
|
|
dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY (local_msgqueue_pa=0x%lx, "
|
|
"local_nentries=%d, remote_nentries=%d) received from "
|
|
"partid=%d, channel=%d\n", args->local_msgqueue_pa,
|
|
args->local_nentries, args->remote_nentries,
|
|
ch->partid, ch->number);
|
|
|
|
if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED)) {
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
if (!(ch->flags & XPC_C_OPENREQUEST)) {
|
|
XPC_DISCONNECT_CHANNEL(ch, xpOpenCloseError,
|
|
&irq_flags);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return;
|
|
}
|
|
|
|
DBUG_ON(!(ch->flags & XPC_C_ROPENREQUEST));
|
|
DBUG_ON(ch->flags & XPC_C_CONNECTED);
|
|
|
|
/*
|
|
* The meaningful OPENREPLY connection state fields are:
|
|
* local_msgqueue_pa = physical address of remote
|
|
* partition's local_msgqueue
|
|
* local_nentries = remote partition's local_nentries
|
|
* remote_nentries = remote partition's remote_nentries
|
|
*/
|
|
DBUG_ON(args->local_msgqueue_pa == 0);
|
|
DBUG_ON(args->local_nentries == 0);
|
|
DBUG_ON(args->remote_nentries == 0);
|
|
|
|
ch->flags |= XPC_C_ROPENREPLY;
|
|
ch->remote_msgqueue_pa = args->local_msgqueue_pa;
|
|
|
|
if (args->local_nentries < ch->remote_nentries) {
|
|
dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
|
|
"remote_nentries=%d, old remote_nentries=%d, "
|
|
"partid=%d, channel=%d\n",
|
|
args->local_nentries, ch->remote_nentries,
|
|
ch->partid, ch->number);
|
|
|
|
ch->remote_nentries = args->local_nentries;
|
|
}
|
|
if (args->remote_nentries < ch->local_nentries) {
|
|
dev_dbg(xpc_chan, "XPC_IPI_OPENREPLY: new "
|
|
"local_nentries=%d, old local_nentries=%d, "
|
|
"partid=%d, channel=%d\n",
|
|
args->remote_nentries, ch->local_nentries,
|
|
ch->partid, ch->number);
|
|
|
|
ch->local_nentries = args->remote_nentries;
|
|
}
|
|
|
|
xpc_process_connect(ch, &irq_flags);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
}
|
|
|
|
/*
|
|
* Attempt to establish a channel connection to a remote partition.
|
|
*/
|
|
static enum xp_retval
|
|
xpc_connect_channel(struct xpc_channel *ch)
|
|
{
|
|
unsigned long irq_flags;
|
|
struct xpc_registration *registration = &xpc_registrations[ch->number];
|
|
|
|
if (mutex_trylock(®istration->mutex) == 0)
|
|
return xpRetry;
|
|
|
|
if (!XPC_CHANNEL_REGISTERED(ch->number)) {
|
|
mutex_unlock(®istration->mutex);
|
|
return xpUnregistered;
|
|
}
|
|
|
|
spin_lock_irqsave(&ch->lock, irq_flags);
|
|
|
|
DBUG_ON(ch->flags & XPC_C_CONNECTED);
|
|
DBUG_ON(ch->flags & XPC_C_OPENREQUEST);
|
|
|
|
if (ch->flags & XPC_C_DISCONNECTING) {
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
mutex_unlock(®istration->mutex);
|
|
return ch->reason;
|
|
}
|
|
|
|
/* add info from the channel connect registration to the channel */
|
|
|
|
ch->kthreads_assigned_limit = registration->assigned_limit;
|
|
ch->kthreads_idle_limit = registration->idle_limit;
|
|
DBUG_ON(atomic_read(&ch->kthreads_assigned) != 0);
|
|
DBUG_ON(atomic_read(&ch->kthreads_idle) != 0);
|
|
DBUG_ON(atomic_read(&ch->kthreads_active) != 0);
|
|
|
|
ch->func = registration->func;
|
|
DBUG_ON(registration->func == NULL);
|
|
ch->key = registration->key;
|
|
|
|
ch->local_nentries = registration->nentries;
|
|
|
|
if (ch->flags & XPC_C_ROPENREQUEST) {
|
|
if (registration->msg_size != ch->msg_size) {
|
|
/* the local and remote sides aren't the same */
|
|
|
|
/*
|
|
* Because XPC_DISCONNECT_CHANNEL() can block we're
|
|
* forced to up the registration sema before we unlock
|
|
* the channel lock. But that's okay here because we're
|
|
* done with the part that required the registration
|
|
* sema. XPC_DISCONNECT_CHANNEL() requires that the
|
|
* channel lock be locked and will unlock and relock
|
|
* the channel lock as needed.
|
|
*/
|
|
mutex_unlock(®istration->mutex);
|
|
XPC_DISCONNECT_CHANNEL(ch, xpUnequalMsgSizes,
|
|
&irq_flags);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
return xpUnequalMsgSizes;
|
|
}
|
|
} else {
|
|
ch->msg_size = registration->msg_size;
|
|
|
|
XPC_SET_REASON(ch, 0, 0);
|
|
ch->flags &= ~XPC_C_DISCONNECTED;
|
|
|
|
atomic_inc(&xpc_partitions[ch->partid].nchannels_active);
|
|
}
|
|
|
|
mutex_unlock(®istration->mutex);
|
|
|
|
/* initiate the connection */
|
|
|
|
ch->flags |= (XPC_C_OPENREQUEST | XPC_C_CONNECTING);
|
|
xpc_IPI_send_openrequest(ch, &irq_flags);
|
|
|
|
xpc_process_connect(ch, &irq_flags);
|
|
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
|
|
return xpSuccess;
|
|
}
|
|
|
|
/*
|
|
* Clear some of the msg flags in the local message queue.
|
|
*/
|
|
static inline void
|
|
xpc_clear_local_msgqueue_flags(struct xpc_channel *ch)
|
|
{
|
|
struct xpc_msg *msg;
|
|
s64 get;
|
|
|
|
get = ch->w_remote_GP.get;
|
|
do {
|
|
msg = (struct xpc_msg *)((u64)ch->local_msgqueue +
|
|
(get % ch->local_nentries) *
|
|
ch->msg_size);
|
|
msg->flags = 0;
|
|
} while (++get < ch->remote_GP.get);
|
|
}
|
|
|
|
/*
|
|
* Clear some of the msg flags in the remote message queue.
|
|
*/
|
|
static inline void
|
|
xpc_clear_remote_msgqueue_flags(struct xpc_channel *ch)
|
|
{
|
|
struct xpc_msg *msg;
|
|
s64 put;
|
|
|
|
put = ch->w_remote_GP.put;
|
|
do {
|
|
msg = (struct xpc_msg *)((u64)ch->remote_msgqueue +
|
|
(put % ch->remote_nentries) *
|
|
ch->msg_size);
|
|
msg->flags = 0;
|
|
} while (++put < ch->remote_GP.put);
|
|
}
|
|
|
|
static void
|
|
xpc_process_msg_IPI(struct xpc_partition *part, int ch_number)
|
|
{
|
|
struct xpc_channel *ch = &part->channels[ch_number];
|
|
int nmsgs_sent;
|
|
|
|
ch->remote_GP = part->remote_GPs[ch_number];
|
|
|
|
/* See what, if anything, has changed for each connected channel */
|
|
|
|
xpc_msgqueue_ref(ch);
|
|
|
|
if (ch->w_remote_GP.get == ch->remote_GP.get &&
|
|
ch->w_remote_GP.put == ch->remote_GP.put) {
|
|
/* nothing changed since GPs were last pulled */
|
|
xpc_msgqueue_deref(ch);
|
|
return;
|
|
}
|
|
|
|
if (!(ch->flags & XPC_C_CONNECTED)) {
|
|
xpc_msgqueue_deref(ch);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* First check to see if messages recently sent by us have been
|
|
* received by the other side. (The remote GET value will have
|
|
* changed since we last looked at it.)
|
|
*/
|
|
|
|
if (ch->w_remote_GP.get != ch->remote_GP.get) {
|
|
|
|
/*
|
|
* We need to notify any senders that want to be notified
|
|
* that their sent messages have been received by their
|
|
* intended recipients. We need to do this before updating
|
|
* w_remote_GP.get so that we don't allocate the same message
|
|
* queue entries prematurely (see xpc_allocate_msg()).
|
|
*/
|
|
if (atomic_read(&ch->n_to_notify) > 0) {
|
|
/*
|
|
* Notify senders that messages sent have been
|
|
* received and delivered by the other side.
|
|
*/
|
|
xpc_notify_senders(ch, xpMsgDelivered,
|
|
ch->remote_GP.get);
|
|
}
|
|
|
|
/*
|
|
* Clear msg->flags in previously sent messages, so that
|
|
* they're ready for xpc_allocate_msg().
|
|
*/
|
|
xpc_clear_local_msgqueue_flags(ch);
|
|
|
|
ch->w_remote_GP.get = ch->remote_GP.get;
|
|
|
|
dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, "
|
|
"channel=%d\n", ch->w_remote_GP.get, ch->partid,
|
|
ch->number);
|
|
|
|
/*
|
|
* If anyone was waiting for message queue entries to become
|
|
* available, wake them up.
|
|
*/
|
|
if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
|
|
wake_up(&ch->msg_allocate_wq);
|
|
}
|
|
|
|
/*
|
|
* Now check for newly sent messages by the other side. (The remote
|
|
* PUT value will have changed since we last looked at it.)
|
|
*/
|
|
|
|
if (ch->w_remote_GP.put != ch->remote_GP.put) {
|
|
/*
|
|
* Clear msg->flags in previously received messages, so that
|
|
* they're ready for xpc_get_deliverable_msg().
|
|
*/
|
|
xpc_clear_remote_msgqueue_flags(ch);
|
|
|
|
ch->w_remote_GP.put = ch->remote_GP.put;
|
|
|
|
dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, "
|
|
"channel=%d\n", ch->w_remote_GP.put, ch->partid,
|
|
ch->number);
|
|
|
|
nmsgs_sent = ch->w_remote_GP.put - ch->w_local_GP.get;
|
|
if (nmsgs_sent > 0) {
|
|
dev_dbg(xpc_chan, "msgs waiting to be copied and "
|
|
"delivered=%d, partid=%d, channel=%d\n",
|
|
nmsgs_sent, ch->partid, ch->number);
|
|
|
|
if (ch->flags & XPC_C_CONNECTEDCALLOUT_MADE)
|
|
xpc_activate_kthreads(ch, nmsgs_sent);
|
|
}
|
|
}
|
|
|
|
xpc_msgqueue_deref(ch);
|
|
}
|
|
|
|
void
|
|
xpc_process_channel_activity(struct xpc_partition *part)
|
|
{
|
|
unsigned long irq_flags;
|
|
u64 IPI_amo, IPI_flags;
|
|
struct xpc_channel *ch;
|
|
int ch_number;
|
|
u32 ch_flags;
|
|
|
|
IPI_amo = xpc_get_IPI_flags(part);
|
|
|
|
/*
|
|
* Initiate channel connections for registered channels.
|
|
*
|
|
* For each connected channel that has pending messages activate idle
|
|
* kthreads and/or create new kthreads as needed.
|
|
*/
|
|
|
|
for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
|
|
ch = &part->channels[ch_number];
|
|
|
|
/*
|
|
* Process any open or close related IPI flags, and then deal
|
|
* with connecting or disconnecting the channel as required.
|
|
*/
|
|
|
|
IPI_flags = XPC_GET_IPI_FLAGS(IPI_amo, ch_number);
|
|
|
|
if (XPC_ANY_OPENCLOSE_IPI_FLAGS_SET(IPI_flags))
|
|
xpc_process_openclose_IPI(part, ch_number, IPI_flags);
|
|
|
|
ch_flags = ch->flags; /* need an atomic snapshot of flags */
|
|
|
|
if (ch_flags & XPC_C_DISCONNECTING) {
|
|
spin_lock_irqsave(&ch->lock, irq_flags);
|
|
xpc_process_disconnect(ch, &irq_flags);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
continue;
|
|
}
|
|
|
|
if (part->act_state == XPC_P_DEACTIVATING)
|
|
continue;
|
|
|
|
if (!(ch_flags & XPC_C_CONNECTED)) {
|
|
if (!(ch_flags & XPC_C_OPENREQUEST)) {
|
|
DBUG_ON(ch_flags & XPC_C_SETUP);
|
|
(void)xpc_connect_channel(ch);
|
|
} else {
|
|
spin_lock_irqsave(&ch->lock, irq_flags);
|
|
xpc_process_connect(ch, &irq_flags);
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Process any message related IPI flags, this may involve the
|
|
* activation of kthreads to deliver any pending messages sent
|
|
* from the other partition.
|
|
*/
|
|
|
|
if (XPC_ANY_MSG_IPI_FLAGS_SET(IPI_flags))
|
|
xpc_process_msg_IPI(part, ch_number);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* XPC's heartbeat code calls this function to inform XPC that a partition is
|
|
* going down. XPC responds by tearing down the XPartition Communication
|
|
* infrastructure used for the just downed partition.
|
|
*
|
|
* XPC's heartbeat code will never call this function and xpc_partition_up()
|
|
* at the same time. Nor will it ever make multiple calls to either function
|
|
* at the same time.
|
|
*/
|
|
void
|
|
xpc_partition_going_down(struct xpc_partition *part, enum xp_retval reason)
|
|
{
|
|
unsigned long irq_flags;
|
|
int ch_number;
|
|
struct xpc_channel *ch;
|
|
|
|
dev_dbg(xpc_chan, "deactivating partition %d, reason=%d\n",
|
|
XPC_PARTID(part), reason);
|
|
|
|
if (!xpc_part_ref(part)) {
|
|
/* infrastructure for this partition isn't currently set up */
|
|
return;
|
|
}
|
|
|
|
/* disconnect channels associated with the partition going down */
|
|
|
|
for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
|
|
ch = &part->channels[ch_number];
|
|
|
|
xpc_msgqueue_ref(ch);
|
|
spin_lock_irqsave(&ch->lock, irq_flags);
|
|
|
|
XPC_DISCONNECT_CHANNEL(ch, reason, &irq_flags);
|
|
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
xpc_msgqueue_deref(ch);
|
|
}
|
|
|
|
xpc_wakeup_channel_mgr(part);
|
|
|
|
xpc_part_deref(part);
|
|
}
|
|
|
|
/*
|
|
* Called by XP at the time of channel connection registration to cause
|
|
* XPC to establish connections to all currently active partitions.
|
|
*/
|
|
void
|
|
xpc_initiate_connect(int ch_number)
|
|
{
|
|
short partid;
|
|
struct xpc_partition *part;
|
|
struct xpc_channel *ch;
|
|
|
|
DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
|
|
|
|
for (partid = 0; partid < xp_max_npartitions; partid++) {
|
|
part = &xpc_partitions[partid];
|
|
|
|
if (xpc_part_ref(part)) {
|
|
ch = &part->channels[ch_number];
|
|
|
|
/*
|
|
* Initiate the establishment of a connection on the
|
|
* newly registered channel to the remote partition.
|
|
*/
|
|
xpc_wakeup_channel_mgr(part);
|
|
xpc_part_deref(part);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
xpc_connected_callout(struct xpc_channel *ch)
|
|
{
|
|
/* let the registerer know that a connection has been established */
|
|
|
|
if (ch->func != NULL) {
|
|
dev_dbg(xpc_chan, "ch->func() called, reason=xpConnected, "
|
|
"partid=%d, channel=%d\n", ch->partid, ch->number);
|
|
|
|
ch->func(xpConnected, ch->partid, ch->number,
|
|
(void *)(u64)ch->local_nentries, ch->key);
|
|
|
|
dev_dbg(xpc_chan, "ch->func() returned, reason=xpConnected, "
|
|
"partid=%d, channel=%d\n", ch->partid, ch->number);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called by XP at the time of channel connection unregistration to cause
|
|
* XPC to teardown all current connections for the specified channel.
|
|
*
|
|
* Before returning xpc_initiate_disconnect() will wait until all connections
|
|
* on the specified channel have been closed/torndown. So the caller can be
|
|
* assured that they will not be receiving any more callouts from XPC to the
|
|
* function they registered via xpc_connect().
|
|
*
|
|
* Arguments:
|
|
*
|
|
* ch_number - channel # to unregister.
|
|
*/
|
|
void
|
|
xpc_initiate_disconnect(int ch_number)
|
|
{
|
|
unsigned long irq_flags;
|
|
short partid;
|
|
struct xpc_partition *part;
|
|
struct xpc_channel *ch;
|
|
|
|
DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
|
|
|
|
/* initiate the channel disconnect for every active partition */
|
|
for (partid = 0; partid < xp_max_npartitions; partid++) {
|
|
part = &xpc_partitions[partid];
|
|
|
|
if (xpc_part_ref(part)) {
|
|
ch = &part->channels[ch_number];
|
|
xpc_msgqueue_ref(ch);
|
|
|
|
spin_lock_irqsave(&ch->lock, irq_flags);
|
|
|
|
if (!(ch->flags & XPC_C_DISCONNECTED)) {
|
|
ch->flags |= XPC_C_WDISCONNECT;
|
|
|
|
XPC_DISCONNECT_CHANNEL(ch, xpUnregistering,
|
|
&irq_flags);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&ch->lock, irq_flags);
|
|
|
|
xpc_msgqueue_deref(ch);
|
|
xpc_part_deref(part);
|
|
}
|
|
}
|
|
|
|
xpc_disconnect_wait(ch_number);
|
|
}
|
|
|
|
/*
|
|
* To disconnect a channel, and reflect it back to all who may be waiting.
|
|
*
|
|
* An OPEN is not allowed until XPC_C_DISCONNECTING is cleared by
|
|
* xpc_process_disconnect(), and if set, XPC_C_WDISCONNECT is cleared by
|
|
* xpc_disconnect_wait().
|
|
*
|
|
* THE CHANNEL IS TO BE LOCKED BY THE CALLER AND WILL REMAIN LOCKED UPON RETURN.
|
|
*/
|
|
void
|
|
xpc_disconnect_channel(const int line, struct xpc_channel *ch,
|
|
enum xp_retval reason, unsigned long *irq_flags)
|
|
{
|
|
u32 channel_was_connected = (ch->flags & XPC_C_CONNECTED);
|
|
|
|
DBUG_ON(!spin_is_locked(&ch->lock));
|
|
|
|
if (ch->flags & (XPC_C_DISCONNECTING | XPC_C_DISCONNECTED))
|
|
return;
|
|
|
|
DBUG_ON(!(ch->flags & (XPC_C_CONNECTING | XPC_C_CONNECTED)));
|
|
|
|
dev_dbg(xpc_chan, "reason=%d, line=%d, partid=%d, channel=%d\n",
|
|
reason, line, ch->partid, ch->number);
|
|
|
|
XPC_SET_REASON(ch, reason, line);
|
|
|
|
ch->flags |= (XPC_C_CLOSEREQUEST | XPC_C_DISCONNECTING);
|
|
/* some of these may not have been set */
|
|
ch->flags &= ~(XPC_C_OPENREQUEST | XPC_C_OPENREPLY |
|
|
XPC_C_ROPENREQUEST | XPC_C_ROPENREPLY |
|
|
XPC_C_CONNECTING | XPC_C_CONNECTED);
|
|
|
|
xpc_IPI_send_closerequest(ch, irq_flags);
|
|
|
|
if (channel_was_connected)
|
|
ch->flags |= XPC_C_WASCONNECTED;
|
|
|
|
spin_unlock_irqrestore(&ch->lock, *irq_flags);
|
|
|
|
/* wake all idle kthreads so they can exit */
|
|
if (atomic_read(&ch->kthreads_idle) > 0) {
|
|
wake_up_all(&ch->idle_wq);
|
|
|
|
} else if ((ch->flags & XPC_C_CONNECTEDCALLOUT_MADE) &&
|
|
!(ch->flags & XPC_C_DISCONNECTINGCALLOUT)) {
|
|
/* start a kthread that will do the xpDisconnecting callout */
|
|
xpc_create_kthreads(ch, 1, 1);
|
|
}
|
|
|
|
/* wake those waiting to allocate an entry from the local msg queue */
|
|
if (atomic_read(&ch->n_on_msg_allocate_wq) > 0)
|
|
wake_up(&ch->msg_allocate_wq);
|
|
|
|
spin_lock_irqsave(&ch->lock, *irq_flags);
|
|
}
|
|
|
|
void
|
|
xpc_disconnect_callout(struct xpc_channel *ch, enum xp_retval reason)
|
|
{
|
|
/*
|
|
* Let the channel's registerer know that the channel is being
|
|
* disconnected. We don't want to do this if the registerer was never
|
|
* informed of a connection being made.
|
|
*/
|
|
|
|
if (ch->func != NULL) {
|
|
dev_dbg(xpc_chan, "ch->func() called, reason=%d, partid=%d, "
|
|
"channel=%d\n", reason, ch->partid, ch->number);
|
|
|
|
ch->func(reason, ch->partid, ch->number, NULL, ch->key);
|
|
|
|
dev_dbg(xpc_chan, "ch->func() returned, reason=%d, partid=%d, "
|
|
"channel=%d\n", reason, ch->partid, ch->number);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for a message entry to become available for the specified channel,
|
|
* but don't wait any longer than 1 jiffy.
|
|
*/
|
|
enum xp_retval
|
|
xpc_allocate_msg_wait(struct xpc_channel *ch)
|
|
{
|
|
enum xp_retval ret;
|
|
|
|
if (ch->flags & XPC_C_DISCONNECTING) {
|
|
DBUG_ON(ch->reason == xpInterrupted);
|
|
return ch->reason;
|
|
}
|
|
|
|
atomic_inc(&ch->n_on_msg_allocate_wq);
|
|
ret = interruptible_sleep_on_timeout(&ch->msg_allocate_wq, 1);
|
|
atomic_dec(&ch->n_on_msg_allocate_wq);
|
|
|
|
if (ch->flags & XPC_C_DISCONNECTING) {
|
|
ret = ch->reason;
|
|
DBUG_ON(ch->reason == xpInterrupted);
|
|
} else if (ret == 0) {
|
|
ret = xpTimeout;
|
|
} else {
|
|
ret = xpInterrupted;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Send a message that contains the user's payload on the specified channel
|
|
* connected to the specified partition.
|
|
*
|
|
* NOTE that this routine can sleep waiting for a message entry to become
|
|
* available. To not sleep, pass in the XPC_NOWAIT flag.
|
|
*
|
|
* Once sent, this routine will not wait for the message to be received, nor
|
|
* will notification be given when it does happen.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* partid - ID of partition to which the channel is connected.
|
|
* ch_number - channel # to send message on.
|
|
* flags - see xp.h for valid flags.
|
|
* payload - pointer to the payload which is to be sent.
|
|
* payload_size - size of the payload in bytes.
|
|
*/
|
|
enum xp_retval
|
|
xpc_initiate_send(short partid, int ch_number, u32 flags, void *payload,
|
|
u16 payload_size)
|
|
{
|
|
struct xpc_partition *part = &xpc_partitions[partid];
|
|
enum xp_retval ret = xpUnknownReason;
|
|
|
|
dev_dbg(xpc_chan, "payload=0x%p, partid=%d, channel=%d\n", payload,
|
|
partid, ch_number);
|
|
|
|
DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
|
|
DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
|
|
DBUG_ON(payload == NULL);
|
|
|
|
if (xpc_part_ref(part)) {
|
|
ret = xpc_send_msg(&part->channels[ch_number], flags, payload,
|
|
payload_size, 0, NULL, NULL);
|
|
xpc_part_deref(part);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Send a message that contains the user's payload on the specified channel
|
|
* connected to the specified partition.
|
|
*
|
|
* NOTE that this routine can sleep waiting for a message entry to become
|
|
* available. To not sleep, pass in the XPC_NOWAIT flag.
|
|
*
|
|
* This routine will not wait for the message to be sent or received.
|
|
*
|
|
* Once the remote end of the channel has received the message, the function
|
|
* passed as an argument to xpc_initiate_send_notify() will be called. This
|
|
* allows the sender to free up or re-use any buffers referenced by the
|
|
* message, but does NOT mean the message has been processed at the remote
|
|
* end by a receiver.
|
|
*
|
|
* If this routine returns an error, the caller's function will NOT be called.
|
|
*
|
|
* Arguments:
|
|
*
|
|
* partid - ID of partition to which the channel is connected.
|
|
* ch_number - channel # to send message on.
|
|
* flags - see xp.h for valid flags.
|
|
* payload - pointer to the payload which is to be sent.
|
|
* payload_size - size of the payload in bytes.
|
|
* func - function to call with asynchronous notification of message
|
|
* receipt. THIS FUNCTION MUST BE NON-BLOCKING.
|
|
* key - user-defined key to be passed to the function when it's called.
|
|
*/
|
|
enum xp_retval
|
|
xpc_initiate_send_notify(short partid, int ch_number, u32 flags, void *payload,
|
|
u16 payload_size, xpc_notify_func func, void *key)
|
|
{
|
|
struct xpc_partition *part = &xpc_partitions[partid];
|
|
enum xp_retval ret = xpUnknownReason;
|
|
|
|
dev_dbg(xpc_chan, "payload=0x%p, partid=%d, channel=%d\n", payload,
|
|
partid, ch_number);
|
|
|
|
DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
|
|
DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
|
|
DBUG_ON(payload == NULL);
|
|
DBUG_ON(func == NULL);
|
|
|
|
if (xpc_part_ref(part)) {
|
|
ret = xpc_send_msg(&part->channels[ch_number], flags, payload,
|
|
payload_size, XPC_N_CALL, func, key);
|
|
xpc_part_deref(part);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Deliver a message to its intended recipient.
|
|
*/
|
|
void
|
|
xpc_deliver_msg(struct xpc_channel *ch)
|
|
{
|
|
struct xpc_msg *msg;
|
|
|
|
msg = xpc_get_deliverable_msg(ch);
|
|
if (msg != NULL) {
|
|
|
|
/*
|
|
* This ref is taken to protect the payload itself from being
|
|
* freed before the user is finished with it, which the user
|
|
* indicates by calling xpc_initiate_received().
|
|
*/
|
|
xpc_msgqueue_ref(ch);
|
|
|
|
atomic_inc(&ch->kthreads_active);
|
|
|
|
if (ch->func != NULL) {
|
|
dev_dbg(xpc_chan, "ch->func() called, msg=0x%p, "
|
|
"msg_number=%ld, partid=%d, channel=%d\n",
|
|
(void *)msg, msg->number, ch->partid,
|
|
ch->number);
|
|
|
|
/* deliver the message to its intended recipient */
|
|
ch->func(xpMsgReceived, ch->partid, ch->number,
|
|
&msg->payload, ch->key);
|
|
|
|
dev_dbg(xpc_chan, "ch->func() returned, msg=0x%p, "
|
|
"msg_number=%ld, partid=%d, channel=%d\n",
|
|
(void *)msg, msg->number, ch->partid,
|
|
ch->number);
|
|
}
|
|
|
|
atomic_dec(&ch->kthreads_active);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Acknowledge receipt of a delivered message.
|
|
*
|
|
* If a message has XPC_M_INTERRUPT set, send an interrupt to the partition
|
|
* that sent the message.
|
|
*
|
|
* This function, although called by users, does not call xpc_part_ref() to
|
|
* ensure that the partition infrastructure is in place. It relies on the
|
|
* fact that we called xpc_msgqueue_ref() in xpc_deliver_msg().
|
|
*
|
|
* Arguments:
|
|
*
|
|
* partid - ID of partition to which the channel is connected.
|
|
* ch_number - channel # message received on.
|
|
* payload - pointer to the payload area allocated via
|
|
* xpc_initiate_send() or xpc_initiate_send_notify().
|
|
*/
|
|
void
|
|
xpc_initiate_received(short partid, int ch_number, void *payload)
|
|
{
|
|
struct xpc_partition *part = &xpc_partitions[partid];
|
|
struct xpc_channel *ch;
|
|
struct xpc_msg *msg = XPC_MSG_ADDRESS(payload);
|
|
|
|
DBUG_ON(partid < 0 || partid >= xp_max_npartitions);
|
|
DBUG_ON(ch_number < 0 || ch_number >= part->nchannels);
|
|
|
|
ch = &part->channels[ch_number];
|
|
xpc_received_msg(ch, msg);
|
|
|
|
/* the call to xpc_msgqueue_ref() was done by xpc_deliver_msg() */
|
|
xpc_msgqueue_deref(ch);
|
|
}
|