/*
 * VFIO based driver for Mediated device
 *
 * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
 *     Author: Neo Jia <cjia@nvidia.com>
 *             Kirti Wankhede <kwankhede@nvidia.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/vfio.h>
#include <linux/mdev.h>

#include "mdev_private.h"

#define DRIVER_VERSION  "0.1"
#define DRIVER_AUTHOR   "NVIDIA Corporation"
#define DRIVER_DESC     "VFIO based driver for Mediated device"

static int vfio_mdev_open(void *device_data)
{
	struct mdev_device *mdev = device_data;
	struct mdev_parent *parent = mdev->parent;
	int ret;

	if (unlikely(!parent->ops->open))
		return -EINVAL;

	if (!try_module_get(THIS_MODULE))
		return -ENODEV;

	ret = parent->ops->open(mdev);
	if (ret)
		module_put(THIS_MODULE);

	return ret;
}

static void vfio_mdev_release(void *device_data)
{
	struct mdev_device *mdev = device_data;
	struct mdev_parent *parent = mdev->parent;

	if (likely(parent->ops->release))
		parent->ops->release(mdev);

	module_put(THIS_MODULE);
}

static long vfio_mdev_unlocked_ioctl(void *device_data,
				     unsigned int cmd, unsigned long arg)
{
	struct mdev_device *mdev = device_data;
	struct mdev_parent *parent = mdev->parent;

	if (unlikely(!parent->ops->ioctl))
		return -EINVAL;

	return parent->ops->ioctl(mdev, cmd, arg);
}

static ssize_t vfio_mdev_read(void *device_data, char __user *buf,
			      size_t count, loff_t *ppos)
{
	struct mdev_device *mdev = device_data;
	struct mdev_parent *parent = mdev->parent;

	if (unlikely(!parent->ops->read))
		return -EINVAL;

	return parent->ops->read(mdev, buf, count, ppos);
}

static ssize_t vfio_mdev_write(void *device_data, const char __user *buf,
			       size_t count, loff_t *ppos)
{
	struct mdev_device *mdev = device_data;
	struct mdev_parent *parent = mdev->parent;

	if (unlikely(!parent->ops->write))
		return -EINVAL;

	return parent->ops->write(mdev, buf, count, ppos);
}

static int vfio_mdev_mmap(void *device_data, struct vm_area_struct *vma)
{
	struct mdev_device *mdev = device_data;
	struct mdev_parent *parent = mdev->parent;

	if (unlikely(!parent->ops->mmap))
		return -EINVAL;

	return parent->ops->mmap(mdev, vma);
}

static const struct vfio_device_ops vfio_mdev_dev_ops = {
	.name		= "vfio-mdev",
	.open		= vfio_mdev_open,
	.release	= vfio_mdev_release,
	.ioctl		= vfio_mdev_unlocked_ioctl,
	.read		= vfio_mdev_read,
	.write		= vfio_mdev_write,
	.mmap		= vfio_mdev_mmap,
};

int vfio_mdev_probe(struct device *dev)
{
	struct mdev_device *mdev = to_mdev_device(dev);

	return vfio_add_group_dev(dev, &vfio_mdev_dev_ops, mdev);
}

void vfio_mdev_remove(struct device *dev)
{
	vfio_del_group_dev(dev);
}

struct mdev_driver vfio_mdev_driver = {
	.name	= "vfio_mdev",
	.probe	= vfio_mdev_probe,
	.remove	= vfio_mdev_remove,
};

static int __init vfio_mdev_init(void)
{
	return mdev_register_driver(&vfio_mdev_driver, THIS_MODULE);
}

static void __exit vfio_mdev_exit(void)
{
	mdev_unregister_driver(&vfio_mdev_driver);
}

module_init(vfio_mdev_init)
module_exit(vfio_mdev_exit)

MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Borislav Petkov &lt;bp@suse.de&gt;</td><td class='right'>2017-01-20 21:29:40 +0100</td></tr>
<tr><th>committer</th><td>Thomas Gleixner &lt;tglx@linutronix.de&gt;</td><td class='right'>2017-01-23 09:39:55 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth?id=c26665ab5c49ad3e142e0f054ca3204f259ba09c'>c26665ab5c49ad3e142e0f054ca3204f259ba09c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/bluetooth?id=c26665ab5c49ad3e142e0f054ca3204f259ba09c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=c26665ab5c49ad3e142e0f054ca3204f259ba09c'>3bab11918e18e9d25ef7544dba05cdf39d1abec5</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/bluetooth?id=c26665ab5c49ad3e142e0f054ca3204f259ba09c'>net/bluetooth</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth?id=7a308bb3016f57e5be11a677d15b821536419d36'>7a308bb3016f57e5be11a677d15b821536419d36</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth?id=c26665ab5c49ad3e142e0f054ca3204f259ba09c&amp;id2=7a308bb3016f57e5be11a677d15b821536419d36'>diff</a>)</td></tr></table>
<div class='commit-subject'>x86/microcode/intel: Drop stashed AP patch pointer optimization</div><div class='commit-msg'>This was meant to save us the scanning of the microcode containter in
the initrd since the first AP had already done that but it can also hurt
us:

Imagine a single hyperthreaded CPU (Intel(R) Atom(TM) CPU N270, for
example) which updates the microcode on the BSP but since the microcode
engine is shared between the two threads, the update on CPU1 doesn't
happen because it has already happened on CPU0 and we don't find a newer
microcode revision on CPU1.

Which doesn't set the intel_ucode_patch pointer and at initrd
jettisoning time we don't save the microcode patch for later
application.

Now, when we suspend to RAM, the loaded microcode gets cleared so we
need to reload but there's no patch saved in the cache.

Removing the optimization fixes this issue and all is fine and dandy.

Fixes: 06b8534cb728 ("x86/microcode: Rework microcode loading")
Signed-off-by: Borislav Petkov &lt;bp@suse.de&gt;
Reviewed-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: http://lkml.kernel.org/r/20170120202955.4091-2-bp@alien8.de
Signed-off-by: Thomas Gleixner &lt;tglx@linutronix.de&gt;

</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=c26665ab5c49ad3e142e0f054ca3204f259ba09c'>Diffstat</a> (limited to 'net/bluetooth')</div><table summary='diffstat' class='diffstat'>