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Merge tag 'to-linus' of git://github.com/rustyrussell/linux

* tag 'to-linus' of git://github.com/rustyrussell/linux: (24 commits)
  lguest: Make sure interrupt is allocated ok by lguest_setup_irq
  lguest: move the lguest tool to the tools directory
  lguest: switch segment-voodoo-numbers to readable symbols
  virtio: balloon: Add freeze, restore handlers to support S4
  virtio: balloon: Move vq initialization into separate function
  virtio: net: Add freeze, restore handlers to support S4
  virtio: net: Move vq and vq buf removal into separate function
  virtio: net: Move vq initialization into separate function
  virtio: blk: Add freeze, restore handlers to support S4
  virtio: blk: Move vq initialization to separate function
  virtio: console: Disable callbacks for virtqueues at start of S4 freeze
  virtio: console: Add freeze and restore handlers to support S4
  virtio: console: Move vq and vq buf removal into separate functions
  virtio: pci: add PM notification handlers for restore, freeze, thaw, poweroff
  virtio: pci: switch to new PM API
  virtio_blk: fix config handler race
  virtio: add debugging if driver doesn't kick.
  virtio: expose added descriptors immediately.
  virtio: avoid modulus operation.
  virtio: support unlocked queue kick
  ...
This commit is contained in:
Linus Torvalds 2012-01-12 12:37:27 -08:00
commit bcf8a3dfcb
23 changed files with 761 additions and 251 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

21
arch/x86/lguest/boot.c
View file

@ -856,18 +856,23 @@ static void __init lguest_init_IRQ(void)
}
/*
* With CONFIG_SPARSE_IRQ, interrupt descriptors are allocated as-needed, so
* rather than set them in lguest_init_IRQ we are called here every time an
* lguest device needs an interrupt.
*
* FIXME: irq_alloc_desc_at() can fail due to lack of memory, we should
* pass that up!
* Interrupt descriptors are allocated as-needed, but low-numbered ones are
* reserved by the generic x86 code. So we ignore irq_alloc_desc_at if it
* tells us the irq is already used: other errors (ie. ENOMEM) we take
* seriously.
*/
void lguest_setup_irq(unsigned int irq)
int lguest_setup_irq(unsigned int irq)
{
irq_alloc_desc_at(irq, 0);
int err;
/* Returns -ve error or vector number. */
err = irq_alloc_desc_at(irq, 0);
if (err < 0 && err != -EEXIST)
return err;
irq_set_chip_and_handler_name(irq, &lguest_irq_controller,
handle_level_irq, "level");
return 0;
}
/*

87
drivers/block/virtio_blk.c
View file

@ -4,6 +4,7 @@
#include <linux/blkdev.h>
#include <linux/hdreg.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/virtio.h>
#include <linux/virtio_blk.h>
#include <linux/scatterlist.h>
@ -36,6 +37,12 @@ struct virtio_blk
/* Process context for config space updates */
struct work_struct config_work;
/* Lock for config space updates */
struct mutex config_lock;
/* enable config space updates */
bool config_enable;
/* What host tells us, plus 2 for header & tailer. */
unsigned int sg_elems;
@ -172,7 +179,7 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
}
}
if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) {
if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr, GFP_ATOMIC)<0) {
mempool_free(vbr, vblk->pool);
return false;
}
@ -318,6 +325,10 @@ static void virtblk_config_changed_work(struct work_struct *work)
char cap_str_2[10], cap_str_10[10];
u64 capacity, size;
mutex_lock(&vblk->config_lock);
if (!vblk->config_enable)
goto done;
/* Host must always specify the capacity. */
vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity),
&capacity, sizeof(capacity));
@ -340,6 +351,8 @@ static void virtblk_config_changed_work(struct work_struct *work)
cap_str_10, cap_str_2);
set_capacity(vblk->disk, capacity);
done:
mutex_unlock(&vblk->config_lock);
}
static void virtblk_config_changed(struct virtio_device *vdev)
@ -349,6 +362,18 @@ static void virtblk_config_changed(struct virtio_device *vdev)
queue_work(virtblk_wq, &vblk->config_work);
}
static int init_vq(struct virtio_blk *vblk)
{
int err = 0;
/* We expect one virtqueue, for output. */
vblk->vq = virtio_find_single_vq(vblk->vdev, blk_done, "requests");
if (IS_ERR(vblk->vq))
err = PTR_ERR(vblk->vq);
return err;
}
static int __devinit virtblk_probe(struct virtio_device *vdev)
{
struct virtio_blk *vblk;
@ -388,14 +413,13 @@ static int __devinit virtblk_probe(struct virtio_device *vdev)
vblk->vdev = vdev;
vblk->sg_elems = sg_elems;
sg_init_table(vblk->sg, vblk->sg_elems);
mutex_init(&vblk->config_lock);
INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
vblk->config_enable = true;
/* We expect one virtqueue, for output. */
vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests");
if (IS_ERR(vblk->vq)) {
err = PTR_ERR(vblk->vq);
err = init_vq(vblk);
if (err)
goto out_free_vblk;
}
vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req));
if (!vblk->pool) {
@ -542,7 +566,10 @@ static void __devexit virtblk_remove(struct virtio_device *vdev)
struct virtio_blk *vblk = vdev->priv;
int index = vblk->index;
flush_work(&vblk->config_work);
/* Prevent config work handler from accessing the device. */
mutex_lock(&vblk->config_lock);
vblk->config_enable = false;
mutex_unlock(&vblk->config_lock);
/* Nothing should be pending. */
BUG_ON(!list_empty(&vblk->reqs));
@ -550,6 +577,8 @@ static void __devexit virtblk_remove(struct virtio_device *vdev)
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
flush_work(&vblk->config_work);
del_gendisk(vblk->disk);
blk_cleanup_queue(vblk->disk->queue);
put_disk(vblk->disk);
@ -559,6 +588,46 @@ static void __devexit virtblk_remove(struct virtio_device *vdev)
ida_simple_remove(&vd_index_ida, index);
}
#ifdef CONFIG_PM
static int virtblk_freeze(struct virtio_device *vdev)
{
struct virtio_blk *vblk = vdev->priv;
/* Ensure we don't receive any more interrupts */
vdev->config->reset(vdev);
/* Prevent config work handler from accessing the device. */
mutex_lock(&vblk->config_lock);
vblk->config_enable = false;
mutex_unlock(&vblk->config_lock);
flush_work(&vblk->config_work);
spin_lock_irq(vblk->disk->queue->queue_lock);
blk_stop_queue(vblk->disk->queue);
spin_unlock_irq(vblk->disk->queue->queue_lock);
blk_sync_queue(vblk->disk->queue);
vdev->config->del_vqs(vdev);
return 0;
}
static int virtblk_restore(struct virtio_device *vdev)
{
struct virtio_blk *vblk = vdev->priv;
int ret;
vblk->config_enable = true;
ret = init_vq(vdev->priv);
if (!ret) {
spin_lock_irq(vblk->disk->queue->queue_lock);
blk_start_queue(vblk->disk->queue);
spin_unlock_irq(vblk->disk->queue->queue_lock);
}
return ret;
}
#endif
static const struct virtio_device_id id_table[] = {
{ VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
{ 0 },
@ -584,6 +653,10 @@ static struct virtio_driver __refdata virtio_blk = {
.probe = virtblk_probe,
.remove = __devexit_p(virtblk_remove),
.config_changed = virtblk_config_changed,
#ifdef CONFIG_PM
.freeze = virtblk_freeze,
.restore = virtblk_restore,
#endif
};
static int __init init(void)

2
drivers/char/hw_random/virtio-rng.c
View file

@ -47,7 +47,7 @@ static void register_buffer(u8 *buf, size_t size)
sg_init_one(&sg, buf, size);
/* There should always be room for one buffer. */
if (virtqueue_add_buf(vq, &sg, 0, 1, buf) < 0)
if (virtqueue_add_buf(vq, &sg, 0, 1, buf, GFP_KERNEL) < 0)
BUG();
virtqueue_kick(vq);

140
drivers/char/virtio_console.c
View file

@ -392,7 +392,7 @@ static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
sg_init_one(sg, buf->buf, buf->size);
ret = virtqueue_add_buf(vq, sg, 0, 1, buf);
ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC);
virtqueue_kick(vq);
return ret;
}
@ -457,7 +457,7 @@ static ssize_t __send_control_msg(struct ports_device *portdev, u32 port_id,
vq = portdev->c_ovq;
sg_init_one(sg, &cpkt, sizeof(cpkt));
if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt) >= 0) {
if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) >= 0) {
virtqueue_kick(vq);
while (!virtqueue_get_buf(vq, &len))
cpu_relax();
@ -506,7 +506,7 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count,
reclaim_consumed_buffers(port);
sg_init_one(sg, in_buf, in_count);
ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf);
ret = virtqueue_add_buf(out_vq, sg, 1, 0, in_buf, GFP_ATOMIC);
/* Tell Host to go! */
virtqueue_kick(out_vq);
@ -1271,6 +1271,20 @@ static void remove_port(struct kref *kref)
kfree(port);
}
static void remove_port_data(struct port *port)
{
struct port_buffer *buf;
/* Remove unused data this port might have received. */
discard_port_data(port);
reclaim_consumed_buffers(port);
/* Remove buffers we queued up for the Host to send us data in. */
while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
free_buf(buf);
}
/*
* Port got unplugged. Remove port from portdev's list and drop the
* kref reference. If no userspace has this port opened, it will
@ -1278,8 +1292,6 @@ static void remove_port(struct kref *kref)
*/
static void unplug_port(struct port *port)
{
struct port_buffer *buf;
spin_lock_irq(&port->portdev->ports_lock);
list_del(&port->list);
spin_unlock_irq(&port->portdev->ports_lock);
@ -1300,14 +1312,7 @@ static void unplug_port(struct port *port)
hvc_remove(port->cons.hvc);
}
/* Remove unused data this port might have received. */
discard_port_data(port);
reclaim_consumed_buffers(port);
/* Remove buffers we queued up for the Host to send us data in. */
while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
free_buf(buf);
remove_port_data(port);
/*
* We should just assume the device itself has gone off --
@ -1659,6 +1664,28 @@ static const struct file_operations portdev_fops = {
.owner = THIS_MODULE,
};
static void remove_vqs(struct ports_device *portdev)
{
portdev->vdev->config->del_vqs(portdev->vdev);
kfree(portdev->in_vqs);
kfree(portdev->out_vqs);
}
static void remove_controlq_data(struct ports_device *portdev)
{
struct port_buffer *buf;
unsigned int len;
if (!use_multiport(portdev))
return;
while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
free_buf(buf);
while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
free_buf(buf);
}
/*
* Once we're further in boot, we get probed like any other virtio
* device.
@ -1764,9 +1791,7 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
/* The host might want to notify mgmt sw about device add failure */
__send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
VIRTIO_CONSOLE_DEVICE_READY, 0);
vdev->config->del_vqs(vdev);
kfree(portdev->in_vqs);
kfree(portdev->out_vqs);
remove_vqs(portdev);
free_chrdev:
unregister_chrdev(portdev->chr_major, "virtio-portsdev");
free:
@ -1804,21 +1829,8 @@ static void virtcons_remove(struct virtio_device *vdev)
* have to just stop using the port, as the vqs are going
* away.
*/
if (use_multiport(portdev)) {
struct port_buffer *buf;
unsigned int len;
while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
free_buf(buf);
while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
free_buf(buf);
}
vdev->config->del_vqs(vdev);
kfree(portdev->in_vqs);
kfree(portdev->out_vqs);
remove_controlq_data(portdev);
remove_vqs(portdev);
kfree(portdev);
}
@ -1832,6 +1844,68 @@ static unsigned int features[] = {
VIRTIO_CONSOLE_F_MULTIPORT,
};
#ifdef CONFIG_PM
static int virtcons_freeze(struct virtio_device *vdev)
{
struct ports_device *portdev;
struct port *port;
portdev = vdev->priv;
vdev->config->reset(vdev);
virtqueue_disable_cb(portdev->c_ivq);
cancel_work_sync(&portdev->control_work);
/*
* Once more: if control_work_handler() was running, it would
* enable the cb as the last step.
*/
virtqueue_disable_cb(portdev->c_ivq);
remove_controlq_data(portdev);
list_for_each_entry(port, &portdev->ports, list) {
virtqueue_disable_cb(port->in_vq);
virtqueue_disable_cb(port->out_vq);
/*
* We'll ask the host later if the new invocation has
* the port opened or closed.
*/
port->host_connected = false;
remove_port_data(port);
}
remove_vqs(portdev);
return 0;
}
static int virtcons_restore(struct virtio_device *vdev)
{
struct ports_device *portdev;
struct port *port;
int ret;
portdev = vdev->priv;
ret = init_vqs(portdev);
if (ret)
return ret;
if (use_multiport(portdev))
fill_queue(portdev->c_ivq, &portdev->cvq_lock);
list_for_each_entry(port, &portdev->ports, list) {
port->in_vq = portdev->in_vqs[port->id];
port->out_vq = portdev->out_vqs[port->id];
fill_queue(port->in_vq, &port->inbuf_lock);
/* Get port open/close status on the host */
send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 1);
}
return 0;
}
#endif
static struct virtio_driver virtio_console = {
.feature_table = features,
.feature_table_size = ARRAY_SIZE(features),
@ -1841,6 +1915,10 @@ static struct virtio_driver virtio_console = {
.probe = virtcons_probe,
.remove = virtcons_remove,
.config_changed = config_intr,
#ifdef CONFIG_PM
.freeze = virtcons_freeze,
.restore = virtcons_restore,
#endif
};
static int __init init(void)

2
drivers/lguest/Makefile
View file

@ -18,7 +18,7 @@ Mastery: PREFIX=M
Beer:
@for f in Preparation Guest Drivers Launcher Host Switcher Mastery; do echo "{==- $$f -==}"; make -s $$f; done; echo "{==-==}"
Preparation Preparation! Guest Drivers Launcher Host Switcher Mastery:
@sh ../../Documentation/virtual/lguest/extract $(PREFIX) `find ../../* -name '*.[chS]' -wholename '*lguest*'`
@sh ../../tools/lguest/extract $(PREFIX) `find ../../* -name '*.[chS]' -wholename '*lguest*'`
Puppy:
@clear
@printf " __ \n (___()'\`;\n /, /\`\n \\\\\\\"--\\\\\\ \n"

18
drivers/lguest/lguest_device.c
View file

@ -241,7 +241,7 @@ static void lg_notify(struct virtqueue *vq)
}
/* An extern declaration inside a C file is bad form. Don't do it. */
extern void lguest_setup_irq(unsigned int irq);
extern int lguest_setup_irq(unsigned int irq);
/*
* This routine finds the Nth virtqueue described in the configuration of
@ -292,17 +292,21 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
/*
* OK, tell virtio_ring.c to set up a virtqueue now we know its size
* and we've got a pointer to its pages.
* and we've got a pointer to its pages. Note that we set weak_barriers
* to 'true': the host just a(nother) SMP CPU, so we only need inter-cpu
* barriers.
*/
vq = vring_new_virtqueue(lvq->config.num, LGUEST_VRING_ALIGN,
vdev, lvq->pages, lg_notify, callback, name);
vq = vring_new_virtqueue(lvq->config.num, LGUEST_VRING_ALIGN, vdev,
true, lvq->pages, lg_notify, callback, name);
if (!vq) {
err = -ENOMEM;
goto unmap;
}
/* Make sure the interrupt is allocated. */
lguest_setup_irq(lvq->config.irq);
err = lguest_setup_irq(lvq->config.irq);
if (err)
goto destroy_vring;
/*
* Tell the interrupt for this virtqueue to go to the virtio_ring
@ -315,7 +319,7 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
err = request_irq(lvq->config.irq, vring_interrupt, IRQF_SHARED,
dev_name(&vdev->dev), vq);
if (err)
goto destroy_vring;
goto free_desc;
/*
* Last of all we hook up our 'struct lguest_vq_info" to the
@ -324,6 +328,8 @@ static struct virtqueue *lg_find_vq(struct virtio_device *vdev,
vq->priv = lvq;
return vq;
free_desc:
irq_free_desc(lvq->config.irq);
destroy_vring:
vring_del_virtqueue(vq);
unmap:

28
drivers/lguest/segments.c
View file

@ -81,8 +81,8 @@ static void fixup_gdt_table(struct lg_cpu *cpu, unsigned start, unsigned end)
* sometimes careless and leaves this as 0, even though it's
* running at privilege level 1. If so, we fix it here.
*/
if ((cpu->arch.gdt[i].b & 0x00006000) == 0)
cpu->arch.gdt[i].b |= (GUEST_PL << 13);
if (cpu->arch.gdt[i].dpl == 0)
cpu->arch.gdt[i].dpl |= GUEST_PL;
/*
* Each descriptor has an "accessed" bit. If we don't set it
@ -90,7 +90,7 @@ static void fixup_gdt_table(struct lg_cpu *cpu, unsigned start, unsigned end)
* that entry into a segment register. But the GDT isn't
* writable by the Guest, so bad things can happen.
*/
cpu->arch.gdt[i].b |= 0x00000100;
cpu->arch.gdt[i].type |= 0x1;
}
}
@ -114,13 +114,19 @@ void setup_default_gdt_entries(struct lguest_ro_state *state)
/*
* The TSS segment refers to the TSS entry for this particular CPU.
* Forgive the magic flags: the 0x8900 means the entry is Present, it's
* privilege level 0 Available 386 TSS system segment, and the 0x67
* means Saturn is eclipsed by Mercury in the twelfth house.
*/
gdt[GDT_ENTRY_TSS].a = 0x00000067 | (tss << 16);
gdt[GDT_ENTRY_TSS].b = 0x00008900 | (tss & 0xFF000000)
| ((tss >> 16) & 0x000000FF);
gdt[GDT_ENTRY_TSS].a = 0;
gdt[GDT_ENTRY_TSS].b = 0;
gdt[GDT_ENTRY_TSS].limit0 = 0x67;
gdt[GDT_ENTRY_TSS].base0 = tss & 0xFFFF;
gdt[GDT_ENTRY_TSS].base1 = (tss >> 16) & 0xFF;
gdt[GDT_ENTRY_TSS].base2 = tss >> 24;
gdt[GDT_ENTRY_TSS].type = 0x9; /* 32-bit TSS (available) */
gdt[GDT_ENTRY_TSS].p = 0x1; /* Entry is present */
gdt[GDT_ENTRY_TSS].dpl = 0x0; /* Privilege level 0 */
gdt[GDT_ENTRY_TSS].s = 0x0; /* system segment */
}
/*
@ -135,8 +141,8 @@ void setup_guest_gdt(struct lg_cpu *cpu)
*/
cpu->arch.gdt[GDT_ENTRY_KERNEL_CS] = FULL_EXEC_SEGMENT;
cpu->arch.gdt[GDT_ENTRY_KERNEL_DS] = FULL_SEGMENT;
cpu->arch.gdt[GDT_ENTRY_KERNEL_CS].b |= (GUEST_PL << 13);
cpu->arch.gdt[GDT_ENTRY_KERNEL_DS].b |= (GUEST_PL << 13);
cpu->arch.gdt[GDT_ENTRY_KERNEL_CS].dpl |= GUEST_PL;
cpu->arch.gdt[GDT_ENTRY_KERNEL_DS].dpl |= GUEST_PL;
}
/*H:650

125
drivers/net/virtio_net.c
View file

@ -370,7 +370,7 @@ static int add_recvbuf_small(struct virtnet_info *vi, gfp_t gfp)
skb_to_sgvec(skb, vi->rx_sg + 1, 0, skb->len);
err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 2, skb, gfp);
if (err < 0)
dev_kfree_skb(skb);
@ -415,8 +415,8 @@ static int add_recvbuf_big(struct virtnet_info *vi, gfp_t gfp)
/* chain first in list head */
first->private = (unsigned long)list;
err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
first, gfp);
err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, MAX_SKB_FRAGS + 2,
first, gfp);
if (err < 0)
give_pages(vi, first);
@ -434,7 +434,7 @@ static int add_recvbuf_mergeable(struct virtnet_info *vi, gfp_t gfp)
sg_init_one(vi->rx_sg, page_address(page), PAGE_SIZE);
err = virtqueue_add_buf_gfp(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
err = virtqueue_add_buf(vi->rvq, vi->rx_sg, 0, 1, page, gfp);
if (err < 0)
give_pages(vi, page);
@ -609,7 +609,7 @@ static int xmit_skb(struct virtnet_info *vi, struct sk_buff *skb)
hdr->num_sg = skb_to_sgvec(skb, vi->tx_sg + 1, 0, skb->len) + 1;
return virtqueue_add_buf(vi->svq, vi->tx_sg, hdr->num_sg,
0, skb);
0, skb, GFP_ATOMIC);
}
static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
@ -767,7 +767,7 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
sg_set_buf(&sg[i + 1], sg_virt(s), s->length);
sg_set_buf(&sg[out + in - 1], &status, sizeof(status));
BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi) < 0);
BUG_ON(virtqueue_add_buf(vi->cvq, sg, out, in, vi, GFP_ATOMIC) < 0);
virtqueue_kick(vi->cvq);
@ -985,15 +985,38 @@ static void virtnet_config_changed(struct virtio_device *vdev)
virtnet_update_status(vi);
}
static int init_vqs(struct virtnet_info *vi)
{
struct virtqueue *vqs[3];
vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
const char *names[] = { "input", "output", "control" };
int nvqs, err;
/* We expect two virtqueues, receive then send,
* and optionally control. */
nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
err = vi->vdev->config->find_vqs(vi->vdev, nvqs, vqs, callbacks, names);
if (err)
return err;
vi->rvq = vqs[0];
vi->svq = vqs[1];
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
vi->cvq = vqs[2];
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
vi->dev->features |= NETIF_F_HW_VLAN_FILTER;
}
return 0;
}
static int virtnet_probe(struct virtio_device *vdev)
{
int err;
struct net_device *dev;
struct virtnet_info *vi;
struct virtqueue *vqs[3];
vq_callback_t *callbacks[] = { skb_recv_done, skb_xmit_done, NULL};
const char *names[] = { "input", "output", "control" };
int nvqs;
/* Allocate ourselves a network device with room for our info */
dev = alloc_etherdev(sizeof(struct virtnet_info));
@ -1065,24 +1088,10 @@ static int virtnet_probe(struct virtio_device *vdev)
if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
vi->mergeable_rx_bufs = true;
/* We expect two virtqueues, receive then send,
* and optionally control. */
nvqs = virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ) ? 3 : 2;
err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
err = init_vqs(vi);
if (err)
goto free_stats;
vi->rvq = vqs[0];
vi->svq = vqs[1];
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ)) {
vi->cvq = vqs[2];
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VLAN))
dev->features |= NETIF_F_HW_VLAN_FILTER;
}
err = register_netdev(dev);
if (err) {
pr_debug("virtio_net: registering device failed\n");
@ -1144,27 +1153,73 @@ static void free_unused_bufs(struct virtnet_info *vi)
BUG_ON(vi->num != 0);
}
static void __devexit virtnet_remove(struct virtio_device *vdev)
static void remove_vq_common(struct virtnet_info *vi)
{
struct virtnet_info *vi = vdev->priv;
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
unregister_netdev(vi->dev);
vi->vdev->config->reset(vi->vdev);
/* Free unused buffers in both send and recv, if any. */
free_unused_bufs(vi);
vdev->config->del_vqs(vi->vdev);
vi->vdev->config->del_vqs(vi->vdev);
while (vi->pages)
__free_pages(get_a_page(vi, GFP_KERNEL), 0);
}
static void __devexit virtnet_remove(struct virtio_device *vdev)
{
struct virtnet_info *vi = vdev->priv;
unregister_netdev(vi->dev);
remove_vq_common(vi);
free_percpu(vi->stats);
free_netdev(vi->dev);
}
#ifdef CONFIG_PM
static int virtnet_freeze(struct virtio_device *vdev)
{
struct virtnet_info *vi = vdev->priv;
virtqueue_disable_cb(vi->rvq);
virtqueue_disable_cb(vi->svq);
if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_CTRL_VQ))
virtqueue_disable_cb(vi->cvq);
netif_device_detach(vi->dev);
cancel_delayed_work_sync(&vi->refill);
if (netif_running(vi->dev))
napi_disable(&vi->napi);
remove_vq_common(vi);
return 0;
}
static int virtnet_restore(struct virtio_device *vdev)
{
struct virtnet_info *vi = vdev->priv;
int err;
err = init_vqs(vi);
if (err)
return err;
if (netif_running(vi->dev))
virtnet_napi_enable(vi);
netif_device_attach(vi->dev);
if (!try_fill_recv(vi, GFP_KERNEL))
queue_delayed_work(system_nrt_wq, &vi->refill, 0);
return 0;
}
#endif
static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
{ 0 },
@ -1189,6 +1244,10 @@ static struct virtio_driver virtio_net_driver = {
.probe = virtnet_probe,
.remove = __devexit_p(virtnet_remove),
.config_changed = virtnet_config_changed,
#ifdef CONFIG_PM
.freeze = virtnet_freeze,
.restore = virtnet_restore,
#endif
};
static int __init init(void)

2
drivers/s390/kvm/kvm_virtio.c
View file

@ -198,7 +198,7 @@ static struct virtqueue *kvm_find_vq(struct virtio_device *vdev,
goto out;
vq = vring_new_virtqueue(config->num, KVM_S390_VIRTIO_RING_ALIGN,
vdev, (void *) config->address,
vdev, true, (void *) config->address,
kvm_notify, callback, name);
if (!vq) {
err = -ENOMEM;

114
drivers/virtio/virtio_balloon.c
View file

@ -1,4 +1,5 @@
/* Virtio balloon implementation, inspired by Dor Loar and Marcelo
/*
* Virtio balloon implementation, inspired by Dor Laor and Marcelo
* Tosatti's implementations.
*
* Copyright 2008 Rusty Russell IBM Corporation
@ -17,7 +18,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
//#define DEBUG
#include <linux/virtio.h>
#include <linux/virtio_balloon.h>
#include <linux/swap.h>
@ -87,7 +88,7 @@ static void tell_host(struct virtio_balloon *vb, struct virtqueue *vq)
init_completion(&vb->acked);
/* We should always be able to add one buffer to an empty queue. */
if (virtqueue_add_buf(vq, &sg, 1, 0, vb) < 0)
if (virtqueue_add_buf(vq, &sg, 1, 0, vb, GFP_KERNEL) < 0)
BUG();
virtqueue_kick(vq);
@ -149,7 +150,6 @@ static void leak_balloon(struct virtio_balloon *vb, size_t num)
vb->num_pages--;
}
/*
* Note that if
* virtio_has_feature(vdev, VIRTIO_BALLOON_F_MUST_TELL_HOST);
@ -220,7 +220,7 @@ static void stats_handle_request(struct virtio_balloon *vb)
vq = vb->stats_vq;
sg_init_one(&sg, vb->stats, sizeof(vb->stats));
if (virtqueue_add_buf(vq, &sg, 1, 0, vb) < 0)
if (virtqueue_add_buf(vq, &sg, 1, 0, vb, GFP_KERNEL) < 0)
BUG();
virtqueue_kick(vq);
}
@ -275,14 +275,46 @@ static int balloon(void *_vballoon)
return 0;
}
static int virtballoon_probe(struct virtio_device *vdev)
static int init_vqs(struct virtio_balloon *vb)
{
struct virtio_balloon *vb;
struct virtqueue *vqs[3];
vq_callback_t *callbacks[] = { balloon_ack, balloon_ack, stats_request };
const char *names[] = { "inflate", "deflate", "stats" };
int err, nvqs;
/*
* We expect two virtqueues: inflate and deflate, and
* optionally stat.
*/
nvqs = virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ) ? 3 : 2;
err = vb->vdev->config->find_vqs(vb->vdev, nvqs, vqs, callbacks, names);
if (err)
return err;
vb->inflate_vq = vqs[0];
vb->deflate_vq = vqs[1];
if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) {
struct scatterlist sg;
vb->stats_vq = vqs[2];
/*
* Prime this virtqueue with one buffer so the hypervisor can
* use it to signal us later.
*/
sg_init_one(&sg, vb->stats, sizeof vb->stats);
if (virtqueue_add_buf(vb->stats_vq, &sg, 1, 0, vb, GFP_KERNEL)
< 0)
BUG();
virtqueue_kick(vb->stats_vq);
}
return 0;
}
static int virtballoon_probe(struct virtio_device *vdev)
{
struct virtio_balloon *vb;
int err;
vdev->priv = vb = kmalloc(sizeof(*vb), GFP_KERNEL);
if (!vb) {
err = -ENOMEM;
@ -295,29 +327,10 @@ static int virtballoon_probe(struct virtio_device *vdev)
vb->vdev = vdev;
vb->need_stats_update = 0;
/* We expect two virtqueues: inflate and deflate,
* and optionally stat. */
nvqs = virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ) ? 3 : 2;
err = vdev->config->find_vqs(vdev, nvqs, vqs, callbacks, names);
err = init_vqs(vb);
if (err)
goto out_free_vb;
vb->inflate_vq = vqs[0];
vb->deflate_vq = vqs[1];
if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_STATS_VQ)) {
struct scatterlist sg;
vb->stats_vq = vqs[2];
/*
* Prime this virtqueue with one buffer so the hypervisor can
* use it to signal us later.
*/
sg_init_one(&sg, vb->stats, sizeof vb->stats);
if (virtqueue_add_buf(vb->stats_vq, &sg, 1, 0, vb) < 0)
BUG();
virtqueue_kick(vb->stats_vq);
}
vb->thread = kthread_run(balloon, vb, "vballoon");
if (IS_ERR(vb->thread)) {
err = PTR_ERR(vb->thread);
@ -351,6 +364,48 @@ static void __devexit virtballoon_remove(struct virtio_device *vdev)
kfree(vb);
}
#ifdef CONFIG_PM
static int virtballoon_freeze(struct virtio_device *vdev)
{
/*
* The kthread is already frozen by the PM core before this
* function is called.
*/
/* Ensure we don't get any more requests from the host */
vdev->config->reset(vdev);
vdev->config->del_vqs(vdev);
return 0;
}
static int virtballoon_thaw(struct virtio_device *vdev)
{
return init_vqs(vdev->priv);
}
static int virtballoon_restore(struct virtio_device *vdev)
{
struct virtio_balloon *vb = vdev->priv;
struct page *page, *page2;
/* We're starting from a clean slate */
vb->num_pages = 0;
/*
* If a request wasn't complete at the time of freezing, this
* could have been set.
*/
vb->need_stats_update = 0;
/* We don't have these pages in the balloon anymore! */
list_for_each_entry_safe(page, page2, &vb->pages, lru) {
list_del(&page->lru);
totalram_pages++;
}
return init_vqs(vdev->priv);
}
#endif
static unsigned int features[] = {
VIRTIO_BALLOON_F_MUST_TELL_HOST,
VIRTIO_BALLOON_F_STATS_VQ,
@ -365,6 +420,11 @@ static struct virtio_driver virtio_balloon_driver = {
.probe = virtballoon_probe,
.remove = __devexit_p(virtballoon_remove),
.config_changed = virtballoon_changed,
#ifdef CONFIG_PM
.freeze = virtballoon_freeze,
.restore = virtballoon_restore,
.thaw = virtballoon_thaw,
#endif
};
static int __init init(void)

4
drivers/virtio/virtio_mmio.c
View file

@ -310,8 +310,8 @@ static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned index,
vm_dev->base + VIRTIO_MMIO_QUEUE_PFN);
/* Create the vring */
vq = vring_new_virtqueue(info->num, VIRTIO_MMIO_VRING_ALIGN,
vdev, info->queue, vm_notify, callback, name);
vq = vring_new_virtqueue(info->num, VIRTIO_MMIO_VRING_ALIGN, vdev,
true, info->queue, vm_notify, callback, name);
if (!vq) {
err = -ENOMEM;
goto error_new_virtqueue;

110
drivers/virtio/virtio_pci.c
View file

@ -55,6 +55,10 @@ struct virtio_pci_device
unsigned msix_vectors;
/* Vectors allocated, excluding per-vq vectors if any */
unsigned msix_used_vectors;
/* Status saved during hibernate/restore */
u8 saved_status;
/* Whether we have vector per vq */
bool per_vq_vectors;
};
@ -414,8 +418,8 @@ static struct virtqueue *setup_vq(struct virtio_device *vdev, unsigned index,
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN);
/* create the vring */
vq = vring_new_virtqueue(info->num, VIRTIO_PCI_VRING_ALIGN,
vdev, info->queue, vp_notify, callback, name);
vq = vring_new_virtqueue(info->num, VIRTIO_PCI_VRING_ALIGN, vdev,
true, info->queue, vp_notify, callback, name);
if (!vq) {
err = -ENOMEM;
goto out_activate_queue;
@ -716,19 +720,114 @@ static void __devexit virtio_pci_remove(struct pci_dev *pci_dev)
}
#ifdef CONFIG_PM
static int virtio_pci_suspend(struct pci_dev *pci_dev, pm_message_t state)
static int virtio_pci_suspend(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
pci_save_state(pci_dev);
pci_set_power_state(pci_dev, PCI_D3hot);
return 0;
}
static int virtio_pci_resume(struct pci_dev *pci_dev)
static int virtio_pci_resume(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
pci_restore_state(pci_dev);
pci_set_power_state(pci_dev, PCI_D0);
return 0;
}
static int virtio_pci_freeze(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct virtio_driver *drv;
int ret;
drv = container_of(vp_dev->vdev.dev.driver,
struct virtio_driver, driver);
ret = 0;
vp_dev->saved_status = vp_get_status(&vp_dev->vdev);
if (drv && drv->freeze)
ret = drv->freeze(&vp_dev->vdev);
if (!ret)
pci_disable_device(pci_dev);
return ret;
}
static int restore_common(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
int ret;
ret = pci_enable_device(pci_dev);
if (ret)
return ret;
pci_set_master(pci_dev);
vp_finalize_features(&vp_dev->vdev);
return ret;
}
static int virtio_pci_thaw(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct virtio_driver *drv;
int ret;
ret = restore_common(dev);
if (ret)
return ret;
drv = container_of(vp_dev->vdev.dev.driver,
struct virtio_driver, driver);
if (drv && drv->thaw)
ret = drv->thaw(&vp_dev->vdev);
else if (drv && drv->restore)
ret = drv->restore(&vp_dev->vdev);
/* Finally, tell the device we're all set */
if (!ret)
vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
return ret;
}
static int virtio_pci_restore(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct virtio_driver *drv;
int ret;
drv = container_of(vp_dev->vdev.dev.driver,
struct virtio_driver, driver);
ret = restore_common(dev);
if (!ret && drv && drv->restore)
ret = drv->restore(&vp_dev->vdev);
/* Finally, tell the device we're all set */
if (!ret)
vp_set_status(&vp_dev->vdev, vp_dev->saved_status);
return ret;
}
static const struct dev_pm_ops virtio_pci_pm_ops = {
.suspend = virtio_pci_suspend,
.resume = virtio_pci_resume,
.freeze = virtio_pci_freeze,
.thaw = virtio_pci_thaw,
.restore = virtio_pci_restore,
.poweroff = virtio_pci_suspend,
};
#endif
static struct pci_driver virtio_pci_driver = {
@ -737,8 +836,7 @@ static struct pci_driver virtio_pci_driver = {
.probe = virtio_pci_probe,
.remove = __devexit_p(virtio_pci_remove),
#ifdef CONFIG_PM
.suspend = virtio_pci_suspend,
.resume = virtio_pci_resume,
.driver.pm = &virtio_pci_pm_ops,
#endif
};

245
drivers/virtio/virtio_ring.c
View file

@ -22,23 +22,27 @@
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/hrtimer.h>
/* virtio guest is communicating with a virtual "device" that actually runs on
* a host processor. Memory barriers are used to control SMP effects. */
#ifdef CONFIG_SMP
/* Where possible, use SMP barriers which are more lightweight than mandatory
* barriers, because mandatory barriers control MMIO effects on accesses
* through relaxed memory I/O windows (which virtio does not use). */
#define virtio_mb() smp_mb()
#define virtio_rmb() smp_rmb()
#define virtio_wmb() smp_wmb()
* through relaxed memory I/O windows (which virtio-pci does not use). */
#define virtio_mb(vq) \
do { if ((vq)->weak_barriers) smp_mb(); else mb(); } while(0)
#define virtio_rmb(vq) \
do { if ((vq)->weak_barriers) smp_rmb(); else rmb(); } while(0)
#define virtio_wmb(vq) \
do { if ((vq)->weak_barriers) smp_rmb(); else rmb(); } while(0)
#else
/* We must force memory ordering even if guest is UP since host could be
* running on another CPU, but SMP barriers are defined to barrier() in that
* configuration. So fall back to mandatory barriers instead. */
#define virtio_mb() mb()
#define virtio_rmb() rmb()
#define virtio_wmb() wmb()
#define virtio_mb(vq) mb()
#define virtio_rmb(vq) rmb()
#define virtio_wmb(vq) wmb()
#endif
#ifdef DEBUG
@ -77,6 +81,9 @@ struct vring_virtqueue
/* Actual memory layout for this queue */
struct vring vring;
/* Can we use weak barriers? */
bool weak_barriers;
/* Other side has made a mess, don't try any more. */
bool broken;
@ -102,6 +109,10 @@ struct vring_virtqueue
#ifdef DEBUG
/* They're supposed to lock for us. */
unsigned int in_use;
/* Figure out if their kicks are too delayed. */
bool last_add_time_valid;
ktime_t last_add_time;
#endif
/* Tokens for callbacks. */
@ -160,12 +171,29 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
return head;
}
int virtqueue_add_buf_gfp(struct virtqueue *_vq,
struct scatterlist sg[],
unsigned int out,
unsigned int in,
void *data,
gfp_t gfp)
/**
* virtqueue_add_buf - expose buffer to other end
* @vq: the struct virtqueue we're talking about.
* @sg: the description of the buffer(s).
* @out_num: the number of sg readable by other side
* @in_num: the number of sg which are writable (after readable ones)
* @data: the token identifying the buffer.
* @gfp: how to do memory allocations (if necessary).
*
* Caller must ensure we don't call this with other virtqueue operations
* at the same time (except where noted).
*
* Returns remaining capacity of queue or a negative error
* (ie. ENOSPC). Note that it only really makes sense to treat all
* positive return values as "available": indirect buffers mean that
* we can put an entire sg[] array inside a single queue entry.
*/
int virtqueue_add_buf(struct virtqueue *_vq,
struct scatterlist sg[],
unsigned int out,
unsigned int in,
void *data,
gfp_t gfp)
{
struct vring_virtqueue *vq = to_vvq(_vq);
unsigned int i, avail, uninitialized_var(prev);
@ -175,6 +203,19 @@ int virtqueue_add_buf_gfp(struct virtqueue *_vq,
BUG_ON(data == NULL);
#ifdef DEBUG
{
ktime_t now = ktime_get();
/* No kick or get, with .1 second between? Warn. */
if (vq->last_add_time_valid)
WARN_ON(ktime_to_ms(ktime_sub(now, vq->last_add_time))
> 100);
vq->last_add_time = now;
vq->last_add_time_valid = true;
}
#endif
/* If the host supports indirect descriptor tables, and we have multiple
* buffers, then go indirect. FIXME: tune this threshold */
if (vq->indirect && (out + in) > 1 && vq->num_free) {
@ -227,40 +268,102 @@ int virtqueue_add_buf_gfp(struct virtqueue *_vq,
vq->data[head] = data;
/* Put entry in available array (but don't update avail->idx until they
* do sync). FIXME: avoid modulus here? */
avail = (vq->vring.avail->idx + vq->num_added++) % vq->vring.num;
* do sync). */
avail = (vq->vring.avail->idx & (vq->vring.num-1));
vq->vring.avail->ring[avail] = head;
/* Descriptors and available array need to be set before we expose the
* new available array entries. */
virtio_wmb(vq);
vq->vring.avail->idx++;
vq->num_added++;
/* This is very unlikely, but theoretically possible. Kick
* just in case. */
if (unlikely(vq->num_added == (1 << 16) - 1))
virtqueue_kick(_vq);
pr_debug("Added buffer head %i to %p\n", head, vq);
END_USE(vq);
return vq->num_free;
}
EXPORT_SYMBOL_GPL(virtqueue_add_buf_gfp);
EXPORT_SYMBOL_GPL(virtqueue_add_buf);
void virtqueue_kick(struct virtqueue *_vq)
/**
* virtqueue_kick_prepare - first half of split virtqueue_kick call.
* @vq: the struct virtqueue
*
* Instead of virtqueue_kick(), you can do:
* if (virtqueue_kick_prepare(vq))
* virtqueue_notify(vq);
*
* This is sometimes useful because the virtqueue_kick_prepare() needs
* to be serialized, but the actual virtqueue_notify() call does not.
*/
bool virtqueue_kick_prepare(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
u16 new, old;
bool needs_kick;
START_USE(vq);
/* Descriptors and available array need to be set before we expose the
* new available array entries. */
virtio_wmb();
virtio_wmb(vq);
old = vq->vring.avail->idx;
new = vq->vring.avail->idx = old + vq->num_added;
old = vq->vring.avail->idx - vq->num_added;
new = vq->vring.avail->idx;
vq->num_added = 0;
/* Need to update avail index before checking if we should notify */
virtio_mb();
if (vq->event ?
vring_need_event(vring_avail_event(&vq->vring), new, old) :
!(vq->vring.used->flags & VRING_USED_F_NO_NOTIFY))
/* Prod other side to tell it about changes. */
vq->notify(&vq->vq);
#ifdef DEBUG
if (vq->last_add_time_valid) {
WARN_ON(ktime_to_ms(ktime_sub(ktime_get(),
vq->last_add_time)) > 100);
}
vq->last_add_time_valid = false;
#endif
if (vq->event) {
needs_kick = vring_need_event(vring_avail_event(&vq->vring),
new, old);
} else {
needs_kick = !(vq->vring.used->flags & VRING_USED_F_NO_NOTIFY);
}
END_USE(vq);
return needs_kick;
}
EXPORT_SYMBOL_GPL(virtqueue_kick_prepare);
/**
* virtqueue_notify - second half of split virtqueue_kick call.
* @vq: the struct virtqueue
*
* This does not need to be serialized.
*/
void virtqueue_notify(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
/* Prod other side to tell it about changes. */
vq->notify(_vq);
}
EXPORT_SYMBOL_GPL(virtqueue_notify);
/**
* virtqueue_kick - update after add_buf
* @vq: the struct virtqueue
*
* After one or more virtqueue_add_buf calls, invoke this to kick
* the other side.
*
* Caller must ensure we don't call this with other virtqueue
* operations at the same time (except where noted).
*/
void virtqueue_kick(struct virtqueue *vq)
{
if (virtqueue_kick_prepare(vq))
virtqueue_notify(vq);
}
EXPORT_SYMBOL_GPL(virtqueue_kick);
@ -294,11 +397,28 @@ static inline bool more_used(const struct vring_virtqueue *vq)
return vq->last_used_idx != vq->vring.used->idx;
}
/**
* virtqueue_get_buf - get the next used buffer
* @vq: the struct virtqueue we're talking about.
* @len: the length written into the buffer
*
* If the driver wrote data into the buffer, @len will be set to the
* amount written. This means you don't need to clear the buffer
* beforehand to ensure there's no data leakage in the case of short
* writes.
*
* Caller must ensure we don't call this with other virtqueue
* operations at the same time (except where noted).
*
* Returns NULL if there are no used buffers, or the "data" token
* handed to virtqueue_add_buf().
*/
void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len)
{
struct vring_virtqueue *vq = to_vvq(_vq);
void *ret;
unsigned int i;
u16 last_used;
START_USE(vq);
@ -314,10 +434,11 @@ void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len)
}
/* Only get used array entries after they have been exposed by host. */
virtio_rmb();
virtio_rmb(vq);
i = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].id;
*len = vq->vring.used->ring[vq->last_used_idx%vq->vring.num].len;
last_used = (vq->last_used_idx & (vq->vring.num - 1));
i = vq->vring.used->ring[last_used].id;
*len = vq->vring.used->ring[last_used].len;
if (unlikely(i >= vq->vring.num)) {
BAD_RING(vq, "id %u out of range\n", i);
@ -337,14 +458,27 @@ void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len)
* the read in the next get_buf call. */
if (!(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) {
vring_used_event(&vq->vring) = vq->last_used_idx;
virtio_mb();
virtio_mb(vq);
}
#ifdef DEBUG
vq->last_add_time_valid = false;
#endif
END_USE(vq);
return ret;
}
EXPORT_SYMBOL_GPL(virtqueue_get_buf);
/**
* virtqueue_disable_cb - disable callbacks
* @vq: the struct virtqueue we're talking about.
*
* Note that this is not necessarily synchronous, hence unreliable and only
* useful as an optimization.
*
* Unlike other operations, this need not be serialized.
*/
void virtqueue_disable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
@ -353,6 +487,17 @@ void virtqueue_disable_cb(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_disable_cb);
/**
* virtqueue_enable_cb - restart callbacks after disable_cb.
* @vq: the struct virtqueue we're talking about.
*
* This re-enables callbacks; it returns "false" if there are pending
* buffers in the queue, to detect a possible race between the driver
* checking for more work, and enabling callbacks.
*
* Caller must ensure we don't call this with other virtqueue
* operations at the same time (except where noted).
*/
bool virtqueue_enable_cb(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
@ -366,7 +511,7 @@ bool virtqueue_enable_cb(struct virtqueue *_vq)
* entry. Always do both to keep code simple. */
vq->vring.avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT;
vring_used_event(&vq->vring) = vq->last_used_idx;
virtio_mb();
virtio_mb(vq);
if (unlikely(more_used(vq))) {
END_USE(vq);
return false;
@ -377,6 +522,19 @@ bool virtqueue_enable_cb(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_enable_cb);
/**
* virtqueue_enable_cb_delayed - restart callbacks after disable_cb.
* @vq: the struct virtqueue we're talking about.
*
* This re-enables callbacks but hints to the other side to delay
* interrupts until most of the available buffers have been processed;
* it returns "false" if there are many pending buffers in the queue,
* to detect a possible race between the driver checking for more work,
* and enabling callbacks.
*
* Caller must ensure we don't call this with other virtqueue
* operations at the same time (except where noted).
*/
bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
@ -393,7 +551,7 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
/* TODO: tune this threshold */
bufs = (u16)(vq->vring.avail->idx - vq->last_used_idx) * 3 / 4;
vring_used_event(&vq->vring) = vq->last_used_idx + bufs;
virtio_mb();
virtio_mb(vq);
if (unlikely((u16)(vq->vring.used->idx - vq->last_used_idx) > bufs)) {
END_USE(vq);
return false;
@ -404,6 +562,14 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_enable_cb_delayed);
/**
* virtqueue_detach_unused_buf - detach first unused buffer
* @vq: the struct virtqueue we're talking about.
*
* Returns NULL or the "data" token handed to virtqueue_add_buf().
* This is not valid on an active queue; it is useful only for device
* shutdown.
*/
void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
@ -453,6 +619,7 @@ EXPORT_SYMBOL_GPL(vring_interrupt);
struct virtqueue *vring_new_virtqueue(unsigned int num,
unsigned int vring_align,
struct virtio_device *vdev,
bool weak_barriers,
void *pages,
void (*notify)(struct virtqueue *),
void (*callback)(struct virtqueue *),
@ -476,12 +643,14 @@ struct virtqueue *vring_new_virtqueue(unsigned int num,
vq->vq.vdev = vdev;
vq->vq.name = name;
vq->notify = notify;
vq->weak_barriers = weak_barriers;
vq->broken = false;
vq->last_used_idx = 0;
vq->num_added = 0;
list_add_tail(&vq->vq.list, &vdev->vqs);
#ifdef DEBUG
vq->in_use = false;
vq->last_add_time_valid = false;
#endif
vq->indirect = virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC);
@ -530,7 +699,13 @@ void vring_transport_features(struct virtio_device *vdev)
}
EXPORT_SYMBOL_GPL(vring_transport_features);
/* return the size of the vring within the virtqueue */
/**
* virtqueue_get_vring_size - return the size of the virtqueue's vring
* @vq: the struct virtqueue containing the vring of interest.
*
* Returns the size of the vring. This is mainly used for boasting to
* userspace. Unlike other operations, this need not be serialized.
*/
unsigned int virtqueue_get_vring_size(struct virtqueue *_vq)
{

77
include/linux/virtio.h
View file

@ -25,71 +25,19 @@ struct virtqueue {
void *priv;
};
/**
* operations for virtqueue
* virtqueue_add_buf: expose buffer to other end
* vq: the struct virtqueue we're talking about.
* sg: the description of the buffer(s).
* out_num: the number of sg readable by other side
* in_num: the number of sg which are writable (after readable ones)
* data: the token identifying the buffer.
* gfp: how to do memory allocations (if necessary).
* Returns remaining capacity of queue (sg segments) or a negative error.
* virtqueue_kick: update after add_buf
* vq: the struct virtqueue
* After one or more add_buf calls, invoke this to kick the other side.
* virtqueue_get_buf: get the next used buffer
* vq: the struct virtqueue we're talking about.
* len: the length written into the buffer
* Returns NULL or the "data" token handed to add_buf.
* virtqueue_disable_cb: disable callbacks
* vq: the struct virtqueue we're talking about.
* Note that this is not necessarily synchronous, hence unreliable and only
* useful as an optimization.
* virtqueue_enable_cb: restart callbacks after disable_cb.
* vq: the struct virtqueue we're talking about.
* This re-enables callbacks; it returns "false" if there are pending
* buffers in the queue, to detect a possible race between the driver
* checking for more work, and enabling callbacks.
* virtqueue_enable_cb_delayed: restart callbacks after disable_cb.
* vq: the struct virtqueue we're talking about.
* This re-enables callbacks but hints to the other side to delay
* interrupts until most of the available buffers have been processed;
* it returns "false" if there are many pending buffers in the queue,
* to detect a possible race between the driver checking for more work,
* and enabling callbacks.
* virtqueue_detach_unused_buf: detach first unused buffer
* vq: the struct virtqueue we're talking about.
* Returns NULL or the "data" token handed to add_buf
* virtqueue_get_vring_size: return the size of the virtqueue's vring
* vq: the struct virtqueue containing the vring of interest.
* Returns the size of the vring.
*
* Locking rules are straightforward: the driver is responsible for
* locking. No two operations may be invoked simultaneously, with the exception
* of virtqueue_disable_cb.
*
* All operations can be called in any context.
*/
int virtqueue_add_buf_gfp(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data,
gfp_t gfp);
static inline int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data)
{
return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
}
int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data,
gfp_t gfp);
void virtqueue_kick(struct virtqueue *vq);
bool virtqueue_kick_prepare(struct virtqueue *vq);
void virtqueue_notify(struct virtqueue *vq);
void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
void virtqueue_disable_cb(struct virtqueue *vq);
@ -146,6 +94,11 @@ struct virtio_driver {
int (*probe)(struct virtio_device *dev);
void (*remove)(struct virtio_device *dev);
void (*config_changed)(struct virtio_device *dev);
#ifdef CONFIG_PM
int (*freeze)(struct virtio_device *dev);
int (*thaw)(struct virtio_device *dev);
int (*restore)(struct virtio_device *dev);
#endif
};
int register_virtio_driver(struct virtio_driver *drv);

1
include/linux/virtio_ring.h
View file

@ -168,6 +168,7 @@ struct virtqueue;
struct virtqueue *vring_new_virtqueue(unsigned int num,
unsigned int vring_align,
struct virtio_device *vdev,
bool weak_barriers,
void *pages,
void (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),

6
net/9p/trans_virtio.c
View file

@ -272,7 +272,8 @@ p9_virtio_request(struct p9_client *client, struct p9_req_t *req)
in = pack_sg_list(chan->sg, out,
VIRTQUEUE_NUM, req->rc->sdata, req->rc->capacity);
err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc);
err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc,
GFP_ATOMIC);
if (err < 0) {
if (err == -ENOSPC) {
chan->ring_bufs_avail = 0;
@ -414,7 +415,8 @@ p9_virtio_zc_request(struct p9_client *client, struct p9_req_t *req,
in += pack_sg_list_p(chan->sg, out + in, VIRTQUEUE_NUM,
in_pages, in_nr_pages, uidata, inlen);
err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc);
err = virtqueue_add_buf(chan->vq, chan->sg, out, in, req->tc,
GFP_ATOMIC);
if (err < 0) {
if (err == -ENOSPC) {
chan->ring_bufs_avail = 0;

0
Documentation/virtual/lguest/.gitignore → tools/lguest/.gitignore vendored
View file

0
Documentation/virtual/lguest/Makefile → tools/lguest/Makefile
View file

0
Documentation/virtual/lguest/extract → tools/lguest/extract
View file

2
Documentation/virtual/lguest/lguest.c → tools/lguest/lguest.c
View file

@ -49,7 +49,7 @@
#include <linux/virtio_rng.h>
#include <linux/virtio_ring.h>
#include <asm/bootparam.h>
#include "../../../include/linux/lguest_launcher.h"
#include "../../include/linux/lguest_launcher.h"
/*L:110
* We can ignore the 43 include files we need for this program, but I do want
* to draw attention to the use of kernel-style types.

0
Documentation/virtual/lguest/lguest.txt → tools/lguest/lguest.txt
View file

22
tools/virtio/linux/virtio.h
View file

@ -186,21 +186,12 @@ struct virtqueue {
#endif
/* Interfaces exported by virtio_ring. */
int virtqueue_add_buf_gfp(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data,
gfp_t gfp);
static inline int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data)
{
return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
}
int virtqueue_add_buf(struct virtqueue *vq,
struct scatterlist sg[],
unsigned int out_num,
unsigned int in_num,
void *data,
gfp_t gfp);
void virtqueue_kick(struct virtqueue *vq);
@ -214,6 +205,7 @@ void *virtqueue_detach_unused_buf(struct virtqueue *vq);
struct virtqueue *vring_new_virtqueue(unsigned int num,
unsigned int vring_align,
struct virtio_device *vdev,
bool weak_barriers,
void *pages,
void (*notify)(struct virtqueue *vq),
void (*callback)(struct virtqueue *vq),

6
tools/virtio/virtio_test.c
View file

@ -92,7 +92,8 @@ static void vq_info_add(struct vdev_info *dev, int num)
assert(r >= 0);
memset(info->ring, 0, vring_size(num, 4096));
vring_init(&info->vring, num, info->ring, 4096);
info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev, info->ring,
info->vq = vring_new_virtqueue(info->vring.num, 4096, &dev->vdev,
true, info->ring,
vq_notify, vq_callback, "test");
assert(info->vq);
info->vq->priv = info;
@ -160,7 +161,8 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq, int bufs)
if (started < bufs) {
sg_init_one(&sl, dev->buf, dev->buf_size);
r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
dev->buf + started);
dev->buf + started,
GFP_ATOMIC);
if (likely(r >= 0)) {
++started;
virtqueue_kick(vq->vq);