litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

about summary refs log tree commit diff stats

diff options

author	Randy Dunlap <rdunlap@xenotime.net>	2005-10-03 01:41:09 -0400
committer	Jeff Garzik <jgarzik@pobox.com>	2005-10-03 22:01:14 -0400
commit	8cb6108baee9dcd1dc96f476fe217d6a6b53c994 (patch)
tree	09eb68368fe4921c260315a927ddddeb4a6ad217 /drivers
parent	0a1c80f1115b9a1aacf00a312a532ceef49dfa1b (diff)

[PATCH] ieee80211: fix gfp flags type

Fix implicit nocast warnings in ieee80211 code: net/ieee80211/ieee80211_tx.c:215:9: warning: implicit cast to nocast type Signed-off-by: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

Diffstat (limited to 'drivers')

0 files changed, 0 insertions, 0 deletions

f94c1741bdc

24
25

40
41

63
64

69
70

76
77
78

94
95

97
98

99
100

101
102
103

104
105

114
115

127
128

138
139

150
151

184
185
186

/*
 * KVM coalesced MMIO
 *
 * Copyright (c) 2008 Bull S.A.S.
 * Copyright 2009 Red Hat, Inc. and/or its affiliates.
 *
 *  Author: Laurent Vivier <Laurent.Vivier@bull.net>
 *
 */

#include "iodev.h"

#include <linux/kvm_host.h>
#include <linux/slab.h>
#include <linux/kvm.h>

#include "coalesced_mmio.h"

static inline struct kvm_coalesced_mmio_dev *to_mmio(struct kvm_io_device *dev)
{
	return container_of(dev, struct kvm_coalesced_mmio_dev, dev);
}

static int coalesced_mmio_in_range(struct kvm_coalesced_mmio_dev *dev,
				   gpa_t addr, int len)
{
	/* is it in a batchable area ?
	 * (addr,len) is fully included in
	 * (zone->addr, zone->size)
	 */
	if (len < 0)
		return 0;
	if (addr + len < addr)
		return 0;
	if (addr < dev->zone.addr)
		return 0;
	if (addr + len > dev->zone.addr + dev->zone.size)
		return 0;
	return 1;
}

static int coalesced_mmio_has_room(struct kvm_coalesced_mmio_dev *dev)
{
	struct kvm_coalesced_mmio_ring *ring;
	unsigned avail;

	/* Are we able to batch it ? */

	/* last is the first free entry
	 * check if we don't meet the first used entry
	 * there is always one unused entry in the buffer
	 */
	ring = dev->kvm->coalesced_mmio_ring;
	avail = (ring->first - ring->last - 1) % KVM_COALESCED_MMIO_MAX;
	if (avail == 0) {
		/* full */
		return 0;
	}

	return 1;
}

static int coalesced_mmio_write(struct kvm_io_device *this,
				gpa_t addr, int len, const void *val)
{
	struct kvm_coalesced_mmio_dev *dev = to_mmio(this);
	struct kvm_coalesced_mmio_ring *ring = dev->kvm->coalesced_mmio_ring;

	if (!coalesced_mmio_in_range(dev, addr, len))
		return -EOPNOTSUPP;

	spin_lock(&dev->kvm->ring_lock);

	if (!coalesced_mmio_has_room(dev)) {
		spin_unlock(&dev->kvm->ring_lock);
		return -EOPNOTSUPP;
	}

	/* copy data in first free entry of the ring */

	ring->coalesced_mmio[ring->last].phys_addr = addr;
	ring->coalesced_mmio[ring->last].len = len;
	memcpy(ring->coalesced_mmio[ring->last].data, val, len);
	smp_wmb();
	ring->last = (ring->last + 1) % KVM_COALESCED_MMIO_MAX;
	spin_unlock(&dev->kvm->ring_lock);
	return 0;
}

static void coalesced_mmio_destructor(struct kvm_io_device *this)
{
	struct kvm_coalesced_mmio_dev *dev = to_mmio(this);

	list_del(&dev->list);

	kfree(dev);
}

static const struct kvm_io_device_ops coalesced_mmio_ops = {
	.write      = coalesced_mmio_write,
	.destructor = coalesced_mmio_destructor,
};

int kvm_coalesced_mmio_init(struct kvm *kvm)
{
	struct page *page;
	int ret;

	ret = -ENOMEM;
	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
	if (!page)
		goto out_err;

	ret = 0;
	kvm->coalesced_mmio_ring = page_address(page);

	/*
	 * We're using this spinlock to sync access to the coalesced ring.
	 * The list doesn't need it's own lock since device registration and
	 * unregistration should only happen when kvm->slots_lock is held.
	 */
	spin_lock_init(&kvm->ring_lock);
	INIT_LIST_HEAD(&kvm->coalesced_zones);

out_err:
	return ret;
}

void kvm_coalesced_mmio_free(struct kvm *kvm)
{
	if (kvm->coalesced_mmio_ring)
		free_page((unsigned long)kvm->coalesced_mmio_ring);
}

int kvm_vm_ioctl_register_coalesced_mmio(struct kvm *kvm,
					 struct kvm_coalesced_mmio_zone *zone)
{
	int ret;
	struct kvm_coalesced_mmio_dev *dev;

	dev = kzalloc(sizeof(struct kvm_coalesced_mmio_dev), GFP_KERNEL);
	if (!dev)
		return -ENOMEM;

	kvm_iodevice_init(&dev->dev, &coalesced_mmio_ops);
	dev->kvm = kvm;
	dev->zone = *zone;

	mutex_lock(&kvm->slots_lock);
	ret = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS, zone->addr,
				      zone->size, &dev->dev);
	if (ret < 0)
		goto out_free_dev;
	list_add_tail(&dev->list, &kvm->coalesced_zones);
	mutex_unlock(&kvm->slots_lock);

	return ret;

out_free_dev:
	mutex_unlock(&kvm->slots_lock);

	kfree(dev);

	if (dev == NULL)
		return -ENXIO;

	return 0;
}

int kvm_vm_ioctl_unregister_coalesced_mmio(struct kvm *kvm,
					   struct kvm_coalesced_mmio_zone *zone)
{
	struct kvm_coalesced_mmio_dev *dev, *tmp;

	mutex_lock(&kvm->slots_lock);

	list_for_each_entry_safe(dev, tmp, &kvm->coalesced_zones, list)
		if (coalesced_mmio_in_range(dev, zone->addr, zone->size)) {
			kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS, &dev->dev);
			kvm_iodevice_destructor(&dev->dev);
		}

	mutex_unlock(&kvm->slots_lock);

	return 0;
}


context:
space:
mode: