f17bb74fb9
Adds the Virtual Services framework and core protocol code. The Virtual Services framework provides a bus for generic inter-vm communications using a high level abstract model. The vservices bus provides support for both HLOS and embedded C clients and servers, allowing VMs to communicate in a common OS independent manner. The vservices bus and services over it are hot-plug capable and can support a wide variety of use cases, including device virtualization using virtual device protocol (classes) and drivers, similar in concept to USB or virtio. Change-Id: I7a696354f59730e0ad340fb92dc85661a7376dee Signed-off-by: Carl van Schaik <carl@cog.systems> Git-commit: 42814676e8bf5fb34060ee80e05e2175ae146292 Git-repo: https://github.com/CogSystems/linux-msm/commits/msm-4.9-hyp [mnalajal@codeaurora: Resolve trivial merge conflicts] Signed-off-by: Murali Nalajala <mnalajal@codeaurora.org> Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
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* drivers/vservices/compat.h
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*
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* Copyright (c) 2012-2018 General Dynamics
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* Copyright (c) 2014 Open Kernel Labs, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Wrapper functions/definitions for compatibility between differnet kernel
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* versions.
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*/
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#ifndef _VSERVICES_COMPAT_H
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#define _VSERVICES_COMPAT_H
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#include <linux/workqueue.h>
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#include <linux/version.h>
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/* The INIT_WORK_ONSTACK macro has a slightly different name in older kernels */
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#ifndef INIT_WORK_ONSTACK
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#define INIT_WORK_ONSTACK(_work, _func) INIT_WORK_ON_STACK(_work, _func)
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#endif
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/*
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* We require a workqueue with no concurrency. This is provided by
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* create_singlethread_workqueue() in kernel prior to 2.6.36.
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* In later versions, create_singlethread_workqueue() enables WQ_MEM_RECLAIM and
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* thus WQ_RESCUER, which allows work items to be grabbed by a rescuer thread
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* and run concurrently if the queue is running too slowly. We must use
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* alloc_ordered_workqueue() instead, to disable the rescuer.
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*/
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static inline struct workqueue_struct *
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vs_create_workqueue(const char *name)
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{
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
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return create_singlethread_workqueue(name);
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#else
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return alloc_ordered_workqueue(name, 0);
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#endif
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}
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/*
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* The max3 macro has only been present from 2.6.37
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* (commit: f27c85c56b32c42bcc54a43189c1e00fdceb23ec)
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*/
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37)
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#define max3(x, y, z) ({ \
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typeof(x) _max1 = (x); \
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typeof(y) _max2 = (y); \
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typeof(z) _max3 = (z); \
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(void) (&_max1 == &_max2); \
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(void) (&_max1 == &_max3); \
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_max1 > _max2 ? (_max1 > _max3 ? _max1 : _max3) : \
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(_max2 > _max3 ? _max2 : _max3); })
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#endif
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#endif /* _VSERVICES_COMPAT_H */
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