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Some nice cleanups, and even a patch my wife did as a "live" demo for 

Latinoware 2012.
 
 There's a slightly non-trivial merge in virtio-net, as we cleaned up the
 virtio add_buf interface while DaveM accepted the mq virtio-net patches.
 
 You can see my solution in my pending-rebases branch, if that helps, but I
 know you love merging:
 
 https://git.kernel.org/?p=linux/kernel/git/rusty/linux.git;a=commit;h=12e4e64fa66a4c812e4855de32abdb4d819526fe
 
 Cheers,
 Rusty.
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Merge tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

Pull virtio update from Rusty Russell:
 "Some nice cleanups, and even a patch my wife did as a "live" demo for
  Latinoware 2012.

  There's a slightly non-trivial merge in virtio-net, as we cleaned up
  the virtio add_buf interface while DaveM accepted the mq virtio-net
  patches."

* tag 'virtio-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (27 commits)
  virtio_console: Add support for remoteproc serial
  virtio_console: Merge struct buffer_token into struct port_buffer
  virtio: add drv_to_virtio to make code clearly
  virtio: use dev_to_virtio wrapper in virtio
  virtio-mmio: Fix irq parsing in command line parameter
  virtio_console: Free buffers from out-queue upon close
  virtio: Convert dev_printk(KERN_<LEVEL> to dev_<level>(
  virtio_console: Use kmalloc instead of kzalloc
  virtio_console: Free buffer if splice fails
  virtio: tools: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: scsi: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: rpmsg: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: net: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: console: make it clear that virtqueue_add_buf() no longer returns > 0
  virtio: make virtqueue_add_buf() returning 0 on success, not capacity.
  virtio: console: don't rely on virtqueue_add_buf() returning capacity.
  virtio_net: don't rely on virtqueue_add_buf() returning capacity.
  virtio-net: remove unused skb_vnet_hdr->num_sg field
  virtio-net: correct capacity math on ring full
  virtio: move queue_index and num_free fields into core struct virtqueue.
  ...
This commit is contained in:
Linus Torvalds 2012-12-20 08:37:04 -08:00
parent 03c850ec32 1b6370463e
commit b7dfde956d
17 changed files with 411 additions and 275 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

329
drivers/char/virtio_console.c
View File

@ -37,8 +37,12 @@
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/kconfig.h>
#include "../tty/hvc/hvc_console.h"
#define is_rproc_enabled IS_ENABLED(CONFIG_REMOTEPROC)
/*
* This is a global struct for storing common data for all the devices
* this driver handles.
@ -111,6 +115,21 @@ struct port_buffer {
size_t len;
/* offset in the buf from which to consume data */
size_t offset;
/* DMA address of buffer */
dma_addr_t dma;
/* Device we got DMA memory from */
struct device *dev;
/* List of pending dma buffers to free */
struct list_head list;
/* If sgpages == 0 then buf is used */
unsigned int sgpages;
/* sg is used if spages > 0. sg must be the last in is struct */
struct scatterlist sg[0];
};
/*
@ -325,6 +344,11 @@ static bool is_console_port(struct port *port)
return false;
}
static bool is_rproc_serial(const struct virtio_device *vdev)
{
return is_rproc_enabled && vdev->id.device == VIRTIO_ID_RPROC_SERIAL;
}
static inline bool use_multiport(struct ports_device *portdev)
{
/*
@ -336,20 +360,110 @@ static inline bool use_multiport(struct ports_device *portdev)
return portdev->vdev->features[0] & (1 << VIRTIO_CONSOLE_F_MULTIPORT);
}
static void free_buf(struct port_buffer *buf)
static DEFINE_SPINLOCK(dma_bufs_lock);
static LIST_HEAD(pending_free_dma_bufs);
static void free_buf(struct port_buffer *buf, bool can_sleep)
{
kfree(buf->buf);
unsigned int i;
for (i = 0; i < buf->sgpages; i++) {
struct page *page = sg_page(&buf->sg[i]);
if (!page)
break;
put_page(page);
}
if (!buf->dev) {
kfree(buf->buf);
} else if (is_rproc_enabled) {
unsigned long flags;
/* dma_free_coherent requires interrupts to be enabled. */
if (!can_sleep) {
/* queue up dma-buffers to be freed later */
spin_lock_irqsave(&dma_bufs_lock, flags);
list_add_tail(&buf->list, &pending_free_dma_bufs);
spin_unlock_irqrestore(&dma_bufs_lock, flags);
return;
}
dma_free_coherent(buf->dev, buf->size, buf->buf, buf->dma);
/* Release device refcnt and allow it to be freed */
put_device(buf->dev);
}
kfree(buf);
}
static struct port_buffer *alloc_buf(size_t buf_size)
static void reclaim_dma_bufs(void)
{
unsigned long flags;
struct port_buffer *buf, *tmp;
LIST_HEAD(tmp_list);
if (list_empty(&pending_free_dma_bufs))
return;
/* Create a copy of the pending_free_dma_bufs while holding the lock */
spin_lock_irqsave(&dma_bufs_lock, flags);
list_cut_position(&tmp_list, &pending_free_dma_bufs,
pending_free_dma_bufs.prev);
spin_unlock_irqrestore(&dma_bufs_lock, flags);
/* Release the dma buffers, without irqs enabled */
list_for_each_entry_safe(buf, tmp, &tmp_list, list) {
list_del(&buf->list);
free_buf(buf, true);
}
}
static struct port_buffer *alloc_buf(struct virtqueue *vq, size_t buf_size,
int pages)
{
struct port_buffer *buf;
buf = kmalloc(sizeof(*buf), GFP_KERNEL);
reclaim_dma_bufs();
/*
* Allocate buffer and the sg list. The sg list array is allocated
* directly after the port_buffer struct.
*/
buf = kmalloc(sizeof(*buf) + sizeof(struct scatterlist) * pages,
GFP_KERNEL);
if (!buf)
goto fail;
buf->buf = kzalloc(buf_size, GFP_KERNEL);
buf->sgpages = pages;
if (pages > 0) {
buf->dev = NULL;
buf->buf = NULL;
return buf;
}
if (is_rproc_serial(vq->vdev)) {
/*
* Allocate DMA memory from ancestor. When a virtio
* device is created by remoteproc, the DMA memory is
* associated with the grandparent device:
* vdev => rproc => platform-dev.
* The code here would have been less quirky if
* DMA_MEMORY_INCLUDES_CHILDREN had been supported
* in dma-coherent.c
*/
if (!vq->vdev->dev.parent || !vq->vdev->dev.parent->parent)
goto free_buf;
buf->dev = vq->vdev->dev.parent->parent;
/* Increase device refcnt to avoid freeing it */
get_device(buf->dev);
buf->buf = dma_alloc_coherent(buf->dev, buf_size, &buf->dma,
GFP_KERNEL);
} else {
buf->dev = NULL;
buf->buf = kmalloc(buf_size, GFP_KERNEL);
}
if (!buf->buf)
goto free_buf;
buf->len = 0;
@ -396,6 +510,8 @@ static int add_inbuf(struct virtqueue *vq, struct port_buffer *buf)
ret = virtqueue_add_buf(vq, sg, 0, 1, buf, GFP_ATOMIC);
virtqueue_kick(vq);
if (!ret)
ret = vq->num_free;
return ret;
}
@ -416,7 +532,7 @@ static void discard_port_data(struct port *port)
port->stats.bytes_discarded += buf->len - buf->offset;
if (add_inbuf(port->in_vq, buf) < 0) {
err++;
free_buf(buf);
free_buf(buf, false);
}
port->inbuf = NULL;
buf = get_inbuf(port);
@ -459,7 +575,7 @@ 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, GFP_ATOMIC) >= 0) {
if (virtqueue_add_buf(vq, sg, 1, 0, &cpkt, GFP_ATOMIC) == 0) {
virtqueue_kick(vq);
while (!virtqueue_get_buf(vq, &len))
cpu_relax();
@ -476,55 +592,29 @@ static ssize_t send_control_msg(struct port *port, unsigned int event,
return 0;
}
struct buffer_token {
union {
void *buf;
struct scatterlist *sg;
} u;
/* If sgpages == 0 then buf is used, else sg is used */
unsigned int sgpages;
};
static void reclaim_sg_pages(struct scatterlist *sg, unsigned int nrpages)
{
int i;
struct page *page;
for (i = 0; i < nrpages; i++) {
page = sg_page(&sg[i]);
if (!page)
break;
put_page(page);
}
kfree(sg);
}
/* Callers must take the port->outvq_lock */
static void reclaim_consumed_buffers(struct port *port)
{
struct buffer_token *tok;
struct port_buffer *buf;
unsigned int len;
if (!port->portdev) {
/* Device has been unplugged. vqs are already gone. */
return;
}
while ((tok = virtqueue_get_buf(port->out_vq, &len))) {
if (tok->sgpages)
reclaim_sg_pages(tok->u.sg, tok->sgpages);
else
kfree(tok->u.buf);
kfree(tok);
while ((buf = virtqueue_get_buf(port->out_vq, &len))) {
free_buf(buf, false);
port->outvq_full = false;
}
}
static ssize_t __send_to_port(struct port *port, struct scatterlist *sg,
int nents, size_t in_count,
struct buffer_token *tok, bool nonblock)
void *data, bool nonblock)
{
struct virtqueue *out_vq;
ssize_t ret;
int err;
unsigned long flags;
unsigned int len;
@ -534,17 +624,17 @@ static ssize_t __send_to_port(struct port *port, struct scatterlist *sg,
reclaim_consumed_buffers(port);
ret = virtqueue_add_buf(out_vq, sg, nents, 0, tok, GFP_ATOMIC);
err = virtqueue_add_buf(out_vq, sg, nents, 0, data, GFP_ATOMIC);
/* Tell Host to go! */
virtqueue_kick(out_vq);
if (ret < 0) {
if (err) {
in_count = 0;
goto done;
}
if (ret == 0)
if (out_vq->num_free == 0)
port->outvq_full = true;
if (nonblock)
@ -572,37 +662,6 @@ done:
return in_count;
}
static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count,
bool nonblock)
{
struct scatterlist sg[1];
struct buffer_token *tok;
tok = kmalloc(sizeof(*tok), GFP_ATOMIC);
if (!tok)
return -ENOMEM;
tok->sgpages = 0;
tok->u.buf = in_buf;
sg_init_one(sg, in_buf, in_count);
return __send_to_port(port, sg, 1, in_count, tok, nonblock);
}
static ssize_t send_pages(struct port *port, struct scatterlist *sg, int nents,
size_t in_count, bool nonblock)
{
struct buffer_token *tok;
tok = kmalloc(sizeof(*tok), GFP_ATOMIC);
if (!tok)
return -ENOMEM;
tok->sgpages = nents;
tok->u.sg = sg;
return __send_to_port(port, sg, nents, in_count, tok, nonblock);
}
/*
* Give out the data that's requested from the buffer that we have
* queued up.
@ -748,9 +807,10 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *offp)
{
struct port *port;
char *buf;
struct port_buffer *buf;
ssize_t ret;
bool nonblock;
struct scatterlist sg[1];
/* Userspace could be out to fool us */
if (!count)
@ -766,11 +826,11 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
count = min((size_t)(32 * 1024), count);
buf = kmalloc(count, GFP_KERNEL);
buf = alloc_buf(port->out_vq, count, 0);
if (!buf)
return -ENOMEM;
ret = copy_from_user(buf, ubuf, count);
ret = copy_from_user(buf->buf, ubuf, count);
if (ret) {
ret = -EFAULT;
goto free_buf;
@ -784,13 +844,14 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
* through to the host.
*/
nonblock = true;
ret = send_buf(port, buf, count, nonblock);
sg_init_one(sg, buf->buf, count);
ret = __send_to_port(port, sg, 1, count, buf, nonblock);
if (nonblock && ret > 0)
goto out;
free_buf:
kfree(buf);
free_buf(buf, true);
out:
return ret;
}
@ -856,6 +917,7 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe,
struct port *port = filp->private_data;
struct sg_list sgl;
ssize_t ret;
struct port_buffer *buf;
struct splice_desc sd = {
.total_len = len,
.flags = flags,
@ -863,22 +925,34 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe,
.u.data = &sgl,
};
/*
* Rproc_serial does not yet support splice. To support splice
* pipe_to_sg() must allocate dma-buffers and copy content from
* regular pages to dma pages. And alloc_buf and free_buf must
* support allocating and freeing such a list of dma-buffers.
*/
if (is_rproc_serial(port->out_vq->vdev))
return -EINVAL;
ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK);
if (ret < 0)
return ret;
buf = alloc_buf(port->out_vq, 0, pipe->nrbufs);
if (!buf)
return -ENOMEM;
sgl.n = 0;
sgl.len = 0;
sgl.size = pipe->nrbufs;
sgl.sg = kmalloc(sizeof(struct scatterlist) * sgl.size, GFP_KERNEL);
if (unlikely(!sgl.sg))
return -ENOMEM;
sgl.sg = buf->sg;
sg_init_table(sgl.sg, sgl.size);
ret = __splice_from_pipe(pipe, &sd, pipe_to_sg);
if (likely(ret > 0))
ret = send_pages(port, sgl.sg, sgl.n, sgl.len, true);
ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true);
if (unlikely(ret <= 0))
free_buf(buf, true);
return ret;
}
@ -927,6 +1001,7 @@ static int port_fops_release(struct inode *inode, struct file *filp)
reclaim_consumed_buffers(port);
spin_unlock_irq(&port->outvq_lock);
reclaim_dma_bufs();
/*
* Locks aren't necessary here as a port can't be opened after
* unplug, and if a port isn't unplugged, a kref would already
@ -1031,6 +1106,7 @@ static const struct file_operations port_fops = {
static int put_chars(u32 vtermno, const char *buf, int count)
{
struct port *port;
struct scatterlist sg[1];
if (unlikely(early_put_chars))
return early_put_chars(vtermno, buf, count);
@ -1039,7 +1115,8 @@ static int put_chars(u32 vtermno, const char *buf, int count)
if (!port)
return -EPIPE;
return send_buf(port, (void *)buf, count, false);
sg_init_one(sg, buf, count);
return __send_to_port(port, sg, 1, count, (void *)buf, false);
}
/*
@ -1076,7 +1153,10 @@ static void resize_console(struct port *port)
return;
vdev = port->portdev->vdev;
if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
/* Don't test F_SIZE at all if we're rproc: not a valid feature! */
if (!is_rproc_serial(vdev) &&
virtio_has_feature(vdev, VIRTIO_CONSOLE_F_SIZE))
hvc_resize(port->cons.hvc, port->cons.ws);
}
@ -1260,7 +1340,7 @@ static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock)
nr_added_bufs = 0;
do {
buf = alloc_buf(PAGE_SIZE);
buf = alloc_buf(vq, PAGE_SIZE, 0);
if (!buf)
break;
@ -1268,7 +1348,7 @@ static unsigned int fill_queue(struct virtqueue *vq, spinlock_t *lock)
ret = add_inbuf(vq, buf);
if (ret < 0) {
spin_unlock_irq(lock);
free_buf(buf);
free_buf(buf, true);
break;
}
nr_added_bufs++;
@ -1356,10 +1436,18 @@ static int add_port(struct ports_device *portdev, u32 id)
goto free_device;
}
/*
* If we're not using multiport support, this has to be a console port
*/
if (!use_multiport(port->portdev)) {
if (is_rproc_serial(port->portdev->vdev))
/*
* For rproc_serial assume remote processor is connected.
* rproc_serial does not want the console port, only
* the generic port implementation.
*/
port->host_connected = true;
else if (!use_multiport(port->portdev)) {
/*
* If we're not using multiport support,
* this has to be a console port.
*/
err = init_port_console(port);
if (err)
goto free_inbufs;
@ -1392,7 +1480,7 @@ static int add_port(struct ports_device *portdev, u32 id)
free_inbufs:
while ((buf = virtqueue_detach_unused_buf(port->in_vq)))
free_buf(buf);
free_buf(buf, true);
free_device:
device_destroy(pdrvdata.class, port->dev->devt);
free_cdev:
@ -1434,7 +1522,11 @@ static void remove_port_data(struct port *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);
free_buf(buf, true);
/* Free pending buffers from the out-queue. */
while ((buf = virtqueue_detach_unused_buf(port->out_vq)))
free_buf(buf, true);
}
/*
@ -1636,7 +1728,7 @@ static void control_work_handler(struct work_struct *work)
if (add_inbuf(portdev->c_ivq, buf) < 0) {
dev_warn(&portdev->vdev->dev,
"Error adding buffer to queue\n");
free_buf(buf);
free_buf(buf, false);
}
}
spin_unlock(&portdev->cvq_lock);
@ -1832,10 +1924,10 @@ static void remove_controlq_data(struct ports_device *portdev)
return;
while ((buf = virtqueue_get_buf(portdev->c_ivq, &len)))
free_buf(buf);
free_buf(buf, true);
while ((buf = virtqueue_detach_unused_buf(portdev->c_ivq)))
free_buf(buf);
free_buf(buf, true);
}
/*
@ -1882,11 +1974,15 @@ static int virtcons_probe(struct virtio_device *vdev)
multiport = false;
portdev->config.max_nr_ports = 1;
if (virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
offsetof(struct virtio_console_config,
max_nr_ports),
&portdev->config.max_nr_ports) == 0)
/* Don't test MULTIPORT at all if we're rproc: not a valid feature! */
if (!is_rproc_serial(vdev) &&
virtio_config_val(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
offsetof(struct virtio_console_config,
max_nr_ports),
&portdev->config.max_nr_ports) == 0) {
multiport = true;
}
err = init_vqs(portdev);
if (err < 0) {
@ -1996,6 +2092,16 @@ static unsigned int features[] = {
VIRTIO_CONSOLE_F_MULTIPORT,
};
static struct virtio_device_id rproc_serial_id_table[] = {
#if IS_ENABLED(CONFIG_REMOTEPROC)
{ VIRTIO_ID_RPROC_SERIAL, VIRTIO_DEV_ANY_ID },
#endif
{ 0 },
};
static unsigned int rproc_serial_features[] = {
};
#ifdef CONFIG_PM
static int virtcons_freeze(struct virtio_device *vdev)
{
@ -2080,6 +2186,20 @@ static struct virtio_driver virtio_console = {
#endif
};
/*
* virtio_rproc_serial refers to __devinit function which causes
* section mismatch warnings. So use __refdata to silence warnings.
*/
static struct virtio_driver __refdata virtio_rproc_serial = {
.feature_table = rproc_serial_features,
.feature_table_size = ARRAY_SIZE(rproc_serial_features),
.driver.name = "virtio_rproc_serial",
.driver.owner = THIS_MODULE,
.id_table = rproc_serial_id_table,
.probe = virtcons_probe,
.remove = virtcons_remove,
};
static int __init init(void)
{
int err;
@ -2104,7 +2224,15 @@ static int __init init(void)
pr_err("Error %d registering virtio driver\n", err);
goto free;
}
err = register_virtio_driver(&virtio_rproc_serial);
if (err < 0) {
pr_err("Error %d registering virtio rproc serial driver\n",
err);
goto unregister;
}
return 0;
unregister:
unregister_virtio_driver(&virtio_console);
free:
if (pdrvdata.debugfs_dir)
debugfs_remove_recursive(pdrvdata.debugfs_dir);
@ -2114,7 +2242,10 @@ free:
static void __exit fini(void)
{
reclaim_dma_bufs();
unregister_virtio_driver(&virtio_console);
unregister_virtio_driver(&virtio_rproc_serial);
class_destroy(pdrvdata.class);
if (pdrvdata.debugfs_dir)

2
drivers/lguest/core.c
View File

@ -225,7 +225,7 @@ int run_guest(struct lg_cpu *cpu, unsigned long __user *user)
* eventfd (ie. the appropriate virtqueue thread)?
*/
if (!send_notify_to_eventfd(cpu)) {
/* OK, we tell the main Laucher. */
/* OK, we tell the main Launcher. */
if (put_user(cpu->pending_notify, user))
return -EFAULT;
return sizeof(cpu->pending_notify);

46
drivers/net/virtio_net.c
View File

@ -130,7 +130,6 @@ struct skb_vnet_hdr {
struct virtio_net_hdr hdr;
struct virtio_net_hdr_mrg_rxbuf mhdr;
};
unsigned int num_sg;
};
struct padded_vnet_hdr {
@ -530,10 +529,10 @@ static bool try_fill_recv(struct receive_queue *rq, gfp_t gfp)
err = add_recvbuf_small(rq, gfp);
oom = err == -ENOMEM;
if (err < 0)
if (err)
break;
++rq->num;
} while (err > 0);
} while (rq->vq->num_free);
if (unlikely(rq->num > rq->max))
rq->max = rq->num;
virtqueue_kick(rq->vq);
@ -640,10 +639,10 @@ static int virtnet_open(struct net_device *dev)
return 0;
}
static unsigned int free_old_xmit_skbs(struct send_queue *sq)
static void free_old_xmit_skbs(struct send_queue *sq)
{
struct sk_buff *skb;
unsigned int len, tot_sgs = 0;
unsigned int len;
struct virtnet_info *vi = sq->vq->vdev->priv;
struct virtnet_stats *stats = this_cpu_ptr(vi->stats);
@ -655,10 +654,8 @@ static unsigned int free_old_xmit_skbs(struct send_queue *sq)
stats->tx_packets++;
u64_stats_update_end(&stats->tx_syncp);
tot_sgs += skb_vnet_hdr(skb)->num_sg;
dev_kfree_skb_any(skb);
}
return tot_sgs;
}
static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
@ -666,6 +663,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
struct skb_vnet_hdr *hdr = skb_vnet_hdr(skb);
const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
struct virtnet_info *vi = sq->vq->vdev->priv;
unsigned num_sg;
pr_debug("%s: xmit %p %pM\n", vi->dev->name, skb, dest);
@ -704,8 +702,8 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
else
sg_set_buf(sq->sg, &hdr->hdr, sizeof hdr->hdr);
hdr->num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
return virtqueue_add_buf(sq->vq, sq->sg, hdr->num_sg,
num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
return virtqueue_add_buf(sq->vq, sq->sg, num_sg,
0, skb, GFP_ATOMIC);
}
@ -714,28 +712,20 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
struct virtnet_info *vi = netdev_priv(dev);
int qnum = skb_get_queue_mapping(skb);
struct send_queue *sq = &vi->sq[qnum];
int capacity;
int err;
/* Free up any pending old buffers before queueing new ones. */
free_old_xmit_skbs(sq);
/* Try to transmit */
capacity = xmit_skb(sq, skb);
err = xmit_skb(sq, skb);
/* This can happen with OOM and indirect buffers. */
if (unlikely(capacity < 0)) {
if (likely(capacity == -ENOMEM)) {
if (net_ratelimit())
dev_warn(&dev->dev,
"TXQ (%d) failure: out of memory\n",
qnum);
} else {
dev->stats.tx_fifo_errors++;
if (net_ratelimit())
dev_warn(&dev->dev,
"Unexpected TXQ (%d) failure: %d\n",
qnum, capacity);
}
/* This should not happen! */
if (unlikely(err)) {
dev->stats.tx_fifo_errors++;
if (net_ratelimit())
dev_warn(&dev->dev,
"Unexpected TXQ (%d) queue failure: %d\n", qnum, err);
dev->stats.tx_dropped++;
kfree_skb(skb);
return NETDEV_TX_OK;
@ -748,12 +738,12 @@ static netdev_tx_t start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Apparently nice girls don't return TX_BUSY; stop the queue
* before it gets out of hand. Naturally, this wastes entries. */
if (capacity < 2+MAX_SKB_FRAGS) {
if (sq->vq->num_free < 2+MAX_SKB_FRAGS) {
netif_stop_subqueue(dev, qnum);
if (unlikely(!virtqueue_enable_cb_delayed(sq->vq))) {
/* More just got used, free them then recheck. */
capacity += free_old_xmit_skbs(sq);
if (capacity >= 2+MAX_SKB_FRAGS) {
free_old_xmit_skbs(sq);
if (sq->vq->num_free >= 2+MAX_SKB_FRAGS) {
netif_start_subqueue(dev, qnum);
virtqueue_disable_cb(sq->vq);
}

6
drivers/rpmsg/virtio_rpmsg_bus.c
View File

@ -764,7 +764,7 @@ int rpmsg_send_offchannel_raw(struct rpmsg_channel *rpdev, u32 src, u32 dst,
/* add message to the remote processor's virtqueue */
err = virtqueue_add_buf(vrp->svq, &sg, 1, 0, msg, GFP_KERNEL);
if (err < 0) {
if (err) {
/*
* need to reclaim the buffer here, otherwise it's lost
* (memory won't leak, but rpmsg won't use it again for TX).
@ -776,8 +776,6 @@ int rpmsg_send_offchannel_raw(struct rpmsg_channel *rpdev, u32 src, u32 dst,
/* tell the remote processor it has a pending message to read */
virtqueue_kick(vrp->svq);
err = 0;
out:
mutex_unlock(&vrp->tx_lock);
return err;
@ -980,7 +978,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
err = virtqueue_add_buf(vrp->rvq, &sg, 0, 1, cpu_addr,
GFP_KERNEL);
WARN_ON(err < 0); /* sanity check; this can't really happen */
WARN_ON(err); /* sanity check; this can't really happen */
}
/* suppress "tx-complete" interrupts */

24
drivers/scsi/virtio_scsi.c
View File

@ -215,7 +215,7 @@ static void virtscsi_ctrl_done(struct virtqueue *vq)
static int virtscsi_kick_event(struct virtio_scsi *vscsi,
struct virtio_scsi_event_node *event_node)
{
int ret;
int err;
struct scatterlist sg;
unsigned long flags;
@ -223,13 +223,14 @@ static int virtscsi_kick_event(struct virtio_scsi *vscsi,
spin_lock_irqsave(&vscsi->event_vq.vq_lock, flags);
ret = virtqueue_add_buf(vscsi->event_vq.vq, &sg, 0, 1, event_node, GFP_ATOMIC);
if (ret >= 0)
err = virtqueue_add_buf(vscsi->event_vq.vq, &sg, 0, 1, event_node,
GFP_ATOMIC);
if (!err)
virtqueue_kick(vscsi->event_vq.vq);
spin_unlock_irqrestore(&vscsi->event_vq.vq_lock, flags);
return ret;
return err;
}
static int virtscsi_kick_event_all(struct virtio_scsi *vscsi)
@ -410,22 +411,23 @@ static int virtscsi_kick_cmd(struct virtio_scsi_target_state *tgt,
{
unsigned int out_num, in_num;
unsigned long flags;
int ret;
int err;
bool needs_kick = false;
spin_lock_irqsave(&tgt->tgt_lock, flags);
virtscsi_map_cmd(tgt, cmd, &out_num, &in_num, req_size, resp_size);
spin_lock(&vq->vq_lock);
ret = virtqueue_add_buf(vq->vq, tgt->sg, out_num, in_num, cmd, gfp);
err = virtqueue_add_buf(vq->vq, tgt->sg, out_num, in_num, cmd, gfp);
spin_unlock(&tgt->tgt_lock);
if (ret >= 0)
ret = virtqueue_kick_prepare(vq->vq);
if (!err)
needs_kick = virtqueue_kick_prepare(vq->vq);
spin_unlock_irqrestore(&vq->vq_lock, flags);
if (ret > 0)
if (needs_kick)
virtqueue_notify(vq->vq);
return ret;
return err;
}
static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
@ -467,7 +469,7 @@ static int virtscsi_queuecommand(struct Scsi_Host *sh, struct scsi_cmnd *sc)
if (virtscsi_kick_cmd(tgt, &vscsi->req_vq, cmd,
sizeof cmd->req.cmd, sizeof cmd->resp.cmd,
GFP_ATOMIC) >= 0)
GFP_ATOMIC) == 0)
ret = 0;
else
mempool_free(cmd, virtscsi_cmd_pool);

30
drivers/virtio/virtio.c
View File

@ -10,33 +10,32 @@ static DEFINE_IDA(virtio_index_ida);
static ssize_t device_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
struct virtio_device *dev = dev_to_virtio(_d);
return sprintf(buf, "0x%04x\n", dev->id.device);
}
static ssize_t vendor_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
struct virtio_device *dev = dev_to_virtio(_d);
return sprintf(buf, "0x%04x\n", dev->id.vendor);
}
static ssize_t status_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
struct virtio_device *dev = dev_to_virtio(_d);
return sprintf(buf, "0x%08x\n", dev->config->get_status(dev));
}
static ssize_t modalias_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
struct virtio_device *dev = dev_to_virtio(_d);
return sprintf(buf, "virtio:d%08Xv%08X\n",
dev->id.device, dev->id.vendor);
}
static ssize_t features_show(struct device *_d,
struct device_attribute *attr, char *buf)
{
struct virtio_device *dev = container_of(_d, struct virtio_device, dev);
struct virtio_device *dev = dev_to_virtio(_d);
unsigned int i;
ssize_t len = 0;
@ -71,10 +70,10 @@ static inline int virtio_id_match(const struct virtio_device *dev,
static int virtio_dev_match(struct device *_dv, struct device_driver *_dr)
{
unsigned int i;
struct virtio_device *dev = container_of(_dv,struct virtio_device,dev);
struct virtio_device *dev = dev_to_virtio(_dv);
const struct virtio_device_id *ids;
ids = container_of(_dr, struct virtio_driver, driver)->id_table;
ids = drv_to_virtio(_dr)->id_table;
for (i = 0; ids[i].device; i++)
if (virtio_id_match(dev, &ids[i]))
return 1;
@ -83,7 +82,7 @@ static int virtio_dev_match(struct device *_dv, struct device_driver *_dr)
static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env)
{
struct virtio_device *dev = container_of(_dv,struct virtio_device,dev);
struct virtio_device *dev = dev_to_virtio(_dv);
return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X",
dev->id.device, dev->id.vendor);
@ -98,8 +97,7 @@ void virtio_check_driver_offered_feature(const struct virtio_device *vdev,
unsigned int fbit)
{
unsigned int i;
struct virtio_driver *drv = container_of(vdev->dev.driver,
struct virtio_driver, driver);
struct virtio_driver *drv = drv_to_virtio(vdev->dev.driver);
for (i = 0; i < drv->feature_table_size; i++)
if (drv->feature_table[i] == fbit)
@ -111,9 +109,8 @@ EXPORT_SYMBOL_GPL(virtio_check_driver_offered_feature);
static int virtio_dev_probe(struct device *_d)
{
int err, i;
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
struct virtio_driver *drv = container_of(dev->dev.driver,
struct virtio_driver, driver);
struct virtio_device *dev = dev_to_virtio(_d);
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
u32 device_features;
/* We have a driver! */
@ -152,9 +149,8 @@ static int virtio_dev_probe(struct device *_d)
static int virtio_dev_remove(struct device *_d)
{
struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
struct virtio_driver *drv = container_of(dev->dev.driver,
struct virtio_driver, driver);
struct virtio_device *dev = dev_to_virtio(_d);
struct virtio_driver *drv = drv_to_virtio(dev->dev.driver);
drv->remove(dev);

7
drivers/virtio/virtio_balloon.c
View File

@ -139,10 +139,9 @@ static void fill_balloon(struct virtio_balloon *vb, size_t num)
struct page *page = balloon_page_enqueue(vb_dev_info);
if (!page) {
if (printk_ratelimit())
dev_printk(KERN_INFO, &vb->vdev->dev,
"Out of puff! Can't get %u pages\n",
VIRTIO_BALLOON_PAGES_PER_PAGE);
dev_info_ratelimited(&vb->vdev->dev,
"Out of puff! Can't get %u pages\n",
VIRTIO_BALLOON_PAGES_PER_PAGE);
/* Sleep for at least 1/5 of a second before retry. */
msleep(200);
break;

30
drivers/virtio/virtio_mmio.c
View File

@ -225,7 +225,7 @@ static void vm_notify(struct virtqueue *vq)
/* We write the queue's selector into the notification register to
* signal the other end */
writel(virtqueue_get_queue_index(vq), vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
writel(vq->index, vm_dev->base + VIRTIO_MMIO_QUEUE_NOTIFY);
}
/* Notify all virtqueues on an interrupt. */
@ -266,7 +266,7 @@ static void vm_del_vq(struct virtqueue *vq)
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vq->vdev);
struct virtio_mmio_vq_info *info = vq->priv;
unsigned long flags, size;
unsigned int index = virtqueue_get_queue_index(vq);
unsigned int index = vq->index;
spin_lock_irqsave(&vm_dev->lock, flags);
list_del(&info->node);
@ -521,25 +521,33 @@ static int vm_cmdline_set(const char *device,
int err;
struct resource resources[2] = {};
char *str;
long long int base;
long long int base, size;
unsigned int irq;
int processed, consumed = 0;
struct platform_device *pdev;
resources[0].flags = IORESOURCE_MEM;
resources[1].flags = IORESOURCE_IRQ;
resources[0].end = memparse(device, &str) - 1;
/* Consume "size" part of the command line parameter */
size = memparse(device, &str);
/* Get "@<base>:<irq>[:<id>]" chunks */
processed = sscanf(str, "@%lli:%u%n:%d%n",
&base, &resources[1].start, &consumed,
&base, &irq, &consumed,
&vm_cmdline_id, &consumed);
if (processed < 2 || processed > 3 || str[consumed])
/*
* sscanf() must processes at least 2 chunks; also there
* must be no extra characters after the last chunk, so
* str[consumed] must be '\0'
*/
if (processed < 2 || str[consumed])
return -EINVAL;
resources[0].flags = IORESOURCE_MEM;
resources[0].start = base;
resources[0].end += base;
resources[1].end = resources[1].start;
resources[0].end = base + size - 1;
resources[1].flags = IORESOURCE_IRQ;
resources[1].start = resources[1].end = irq;
if (!vm_cmdline_parent_registered) {
err = device_register(&vm_cmdline_parent);

20
drivers/virtio/virtio_pci.c
View File

@ -203,8 +203,7 @@ static void vp_notify(struct virtqueue *vq)
/* we write the queue's selector into the notification register to
* signal the other end */
iowrite16(virtqueue_get_queue_index(vq),
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
}
/* Handle a configuration change: Tell driver if it wants to know. */
@ -479,8 +478,7 @@ static void vp_del_vq(struct virtqueue *vq)
list_del(&info->node);
spin_unlock_irqrestore(&vp_dev->lock, flags);
iowrite16(virtqueue_get_queue_index(vq),
vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
if (vp_dev->msix_enabled) {
iowrite16(VIRTIO_MSI_NO_VECTOR,
@ -830,16 +828,4 @@ static struct pci_driver virtio_pci_driver = {
#endif
};
static int __init virtio_pci_init(void)
{
return pci_register_driver(&virtio_pci_driver);
}
module_init(virtio_pci_init);
static void __exit virtio_pci_exit(void)
{
pci_unregister_driver(&virtio_pci_driver);
}
module_exit(virtio_pci_exit);
module_pci_driver(virtio_pci_driver);

46
drivers/virtio/virtio_ring.c
View File

@ -93,8 +93,6 @@ struct vring_virtqueue
/* Host publishes avail event idx */
bool event;
/* Number of free buffers */
unsigned int num_free;
/* Head of free buffer list. */
unsigned int free_head;
/* Number we've added since last sync. */
@ -106,9 +104,6 @@ struct vring_virtqueue
/* How to notify other side. FIXME: commonalize hcalls! */
void (*notify)(struct virtqueue *vq);
/* Index of the queue */
int queue_index;
#ifdef DEBUG
/* They're supposed to lock for us. */
unsigned int in_use;
@ -135,6 +130,13 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
unsigned head;
int i;
/*
* We require lowmem mappings for the descriptors because
* otherwise virt_to_phys will give us bogus addresses in the
* virtqueue.
*/
gfp &= ~(__GFP_HIGHMEM | __GFP_HIGH);
desc = kmalloc((out + in) * sizeof(struct vring_desc), gfp);
if (!desc)
return -ENOMEM;
@ -160,7 +162,7 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
desc[i-1].next = 0;
/* We're about to use a buffer */
vq->num_free--;
vq->vq.num_free--;
/* Use a single buffer which doesn't continue */
head = vq->free_head;
@ -174,13 +176,6 @@ static int vring_add_indirect(struct vring_virtqueue *vq,
return head;
}
int virtqueue_get_queue_index(struct virtqueue *_vq)
{
struct vring_virtqueue *vq = to_vvq(_vq);
return vq->queue_index;
}
EXPORT_SYMBOL_GPL(virtqueue_get_queue_index);
/**
* virtqueue_add_buf - expose buffer to other end
* @vq: the struct virtqueue we're talking about.
@ -193,10 +188,7 @@ EXPORT_SYMBOL_GPL(virtqueue_get_queue_index);
* 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.
* Returns zero or a negative error (ie. ENOSPC, ENOMEM).
*/
int virtqueue_add_buf(struct virtqueue *_vq,
struct scatterlist sg[],
@ -228,7 +220,7 @@ int virtqueue_add_buf(struct virtqueue *_vq,
/* 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) {
if (vq->indirect && (out + in) > 1 && vq->vq.num_free) {
head = vring_add_indirect(vq, sg, out, in, gfp);
if (likely(head >= 0))
goto add_head;
@ -237,9 +229,9 @@ int virtqueue_add_buf(struct virtqueue *_vq,
BUG_ON(out + in > vq->vring.num);
BUG_ON(out + in == 0);
if (vq->num_free < out + in) {
if (vq->vq.num_free < out + in) {
pr_debug("Can't add buf len %i - avail = %i\n",
out + in, vq->num_free);
out + in, vq->vq.num_free);
/* FIXME: for historical reasons, we force a notify here if
* there are outgoing parts to the buffer. Presumably the
* host should service the ring ASAP. */
@ -250,7 +242,7 @@ int virtqueue_add_buf(struct virtqueue *_vq,
}
/* We're about to use some buffers from the free list. */
vq->num_free -= out + in;
vq->vq.num_free -= out + in;
head = vq->free_head;
for (i = vq->free_head; out; i = vq->vring.desc[i].next, out--) {
@ -296,7 +288,7 @@ add_head:
pr_debug("Added buffer head %i to %p\n", head, vq);
END_USE(vq);
return vq->num_free;
return 0;
}
EXPORT_SYMBOL_GPL(virtqueue_add_buf);
@ -393,13 +385,13 @@ static void detach_buf(struct vring_virtqueue *vq, unsigned int head)
while (vq->vring.desc[i].flags & VRING_DESC_F_NEXT) {
i = vq->vring.desc[i].next;
vq->num_free++;
vq->vq.num_free++;
}
vq->vring.desc[i].next = vq->free_head;
vq->free_head = head;
/* Plus final descriptor */
vq->num_free++;
vq->vq.num_free++;
}
static inline bool more_used(const struct vring_virtqueue *vq)
@ -599,7 +591,7 @@ void *virtqueue_detach_unused_buf(struct virtqueue *_vq)
return buf;
}
/* That should have freed everything. */
BUG_ON(vq->num_free != vq->vring.num);
BUG_ON(vq->vq.num_free != vq->vring.num);
END_USE(vq);
return NULL;
@ -653,12 +645,13 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
vq->vq.callback = callback;
vq->vq.vdev = vdev;
vq->vq.name = name;
vq->vq.num_free = num;
vq->vq.index = index;
vq->notify = notify;
vq->weak_barriers = weak_barriers;
vq->broken = false;
vq->last_used_idx = 0;
vq->num_added = 0;
vq->queue_index = index;
list_add_tail(&vq->vq.list, &vdev->vqs);
#ifdef DEBUG
vq->in_use = false;
@ -673,7 +666,6 @@ struct virtqueue *vring_new_virtqueue(unsigned int index,
vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT;
/* Put everything in free lists. */
vq->num_free = num;
vq->free_head = 0;
for (i = 0; i < num-1; i++) {
vq->vring.desc[i].next = i+1;

25
include/linux/virtio.h
View File

@ -16,12 +16,20 @@
* @name: the name of this virtqueue (mainly for debugging)
* @vdev: the virtio device this queue was created for.
* @priv: a pointer for the virtqueue implementation to use.
* @index: the zero-based ordinal number for this queue.
* @num_free: number of elements we expect to be able to fit.
*
* A note on @num_free: with indirect buffers, each buffer needs one
* element in the queue, otherwise a buffer will need one element per
* sg element.
*/
struct virtqueue {
struct list_head list;
void (*callback)(struct virtqueue *vq);
const char *name;
struct virtio_device *vdev;
unsigned int index;
unsigned int num_free;
void *priv;
};
@ -50,7 +58,11 @@ void *virtqueue_detach_unused_buf(struct virtqueue *vq);
unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
int virtqueue_get_queue_index(struct virtqueue *vq);
/* FIXME: Obsolete accessor, but required for virtio_net merge. */
static inline unsigned int virtqueue_get_queue_index(struct virtqueue *vq)
{
return vq->index;
}
/**
* virtio_device - representation of a device using virtio
@ -73,7 +85,11 @@ struct virtio_device {
void *priv;
};
#define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
static inline struct virtio_device *dev_to_virtio(struct device *_dev)
{
return container_of(_dev, struct virtio_device, dev);
}
int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);
@ -103,6 +119,11 @@ struct virtio_driver {
#endif
};
static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv)
{
return container_of(drv, struct virtio_driver, driver);
}
int register_virtio_driver(struct virtio_driver *drv);
void unregister_virtio_driver(struct virtio_driver *drv);
#endif /* _LINUX_VIRTIO_H */

28
include/linux/virtio_scsi.h
View File

@ -1,7 +1,31 @@
/*
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUX_VIRTIO_SCSI_H
#define _LINUX_VIRTIO_SCSI_H
/* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers. */
#define VIRTIO_SCSI_CDB_SIZE 32
#define VIRTIO_SCSI_SENSE_SIZE 96

1
include/uapi/linux/virtio_ids.h
View File

@ -37,5 +37,6 @@
#define VIRTIO_ID_RPMSG 7 /* virtio remote processor messaging */
#define VIRTIO_ID_SCSI 8 /* virtio scsi */
#define VIRTIO_ID_9P 9 /* 9p virtio console */
#define VIRTIO_ID_RPROC_SERIAL 11 /* virtio remoteproc serial link */
#endif /* _LINUX_VIRTIO_IDS_H */

1
mm/highmem.c
View File

@ -105,6 +105,7 @@ struct page *kmap_to_page(void *vaddr)
return virt_to_page(addr);
}
EXPORT_SYMBOL(kmap_to_page);
static void flush_all_zero_pkmaps(void)
{

3
net/9p/trans_virtio.c
View File

@ -39,6 +39,7 @@
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/file.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <net/9p/9p.h>
#include <linux/parser.h>
@ -325,7 +326,7 @@ static int p9_get_mapped_pages(struct virtio_chan *chan,
int count = nr_pages;
while (nr_pages) {
s = rest_of_page(data);
pages[index++] = virt_to_page(data);
pages[index++] = kmap_to_page(data);
data += s;
nr_pages--;
}

84
tools/lguest/lguest.c
View File

@ -179,29 +179,6 @@ static struct termios orig_term;
#define wmb() __asm__ __volatile__("" : : : "memory")
#define mb() __asm__ __volatile__("" : : : "memory")
/*
* Convert an iovec element to the given type.
*
* This is a fairly ugly trick: we need to know the size of the type and
* alignment requirement to check the pointer is kosher. It's also nice to
* have the name of the type in case we report failure.
*
* Typing those three things all the time is cumbersome and error prone, so we
* have a macro which sets them all up and passes to the real function.
*/
#define convert(iov, type) \
((type *)_convert((iov), sizeof(type), __alignof__(type), #type))
static void *_convert(struct iovec *iov, size_t size, size_t align,
const char *name)
{
if (iov->iov_len != size)
errx(1, "Bad iovec size %zu for %s", iov->iov_len, name);
if ((unsigned long)iov->iov_base % align != 0)
errx(1, "Bad alignment %p for %s", iov->iov_base, name);
return iov->iov_base;
}
/* Wrapper for the last available index. Makes it easier to change. */
#define lg_last_avail(vq) ((vq)->last_avail_idx)
@ -228,7 +205,8 @@ static bool iov_empty(const struct iovec iov[], unsigned int num_iov)
}
/* Take len bytes from the front of this iovec. */
static void iov_consume(struct iovec iov[], unsigned num_iov, unsigned len)
static void iov_consume(struct iovec iov[], unsigned num_iov,
void *dest, unsigned len)
{
unsigned int i;
@ -236,11 +214,16 @@ static void iov_consume(struct iovec iov[], unsigned num_iov, unsigned len)
unsigned int used;
used = iov[i].iov_len < len ? iov[i].iov_len : len;
if (dest) {
memcpy(dest, iov[i].iov_base, used);
dest += used;
}
iov[i].iov_base += used;
iov[i].iov_len -= used;
len -= used;
}
assert(len == 0);
if (len != 0)
errx(1, "iovec too short!");
}
/* The device virtqueue descriptors are followed by feature bitmasks. */
@ -864,7 +847,7 @@ static void console_output(struct virtqueue *vq)
warn("Write to stdout gave %i (%d)", len, errno);
break;
}
iov_consume(iov, out, len);
iov_consume(iov, out, NULL, len);
}
/*
@ -1591,9 +1574,9 @@ static void blk_request(struct virtqueue *vq)
{
struct vblk_info *vblk = vq->dev->priv;
unsigned int head, out_num, in_num, wlen;
int ret;
int ret, i;
u8 *in;
struct virtio_blk_outhdr *out;
struct virtio_blk_outhdr out;
struct iovec iov[vq->vring.num];
off64_t off;
@ -1603,32 +1586,36 @@ static void blk_request(struct virtqueue *vq)
*/
head = wait_for_vq_desc(vq, iov, &out_num, &in_num);
/*
* Every block request should contain at least one output buffer
* (detailing the location on disk and the type of request) and one
* input buffer (to hold the result).
*/
if (out_num == 0 || in_num == 0)
errx(1, "Bad virtblk cmd %u out=%u in=%u",
head, out_num, in_num);
/* Copy the output header from the front of the iov (adjusts iov) */
iov_consume(iov, out_num, &out, sizeof(out));
/* Find and trim end of iov input array, for our status byte. */
in = NULL;
for (i = out_num + in_num - 1; i >= out_num; i--) {
if (iov[i].iov_len > 0) {
in = iov[i].iov_base + iov[i].iov_len - 1;
iov[i].iov_len--;
break;
}
}
if (!in)
errx(1, "Bad virtblk cmd with no room for status");
out = convert(&iov[0], struct virtio_blk_outhdr);
in = convert(&iov[out_num+in_num-1], u8);
/*
* For historical reasons, block operations are expressed in 512 byte
* "sectors".
*/
off = out->sector * 512;
off = out.sector * 512;
/*
* In general the virtio block driver is allowed to try SCSI commands.
* It'd be nice if we supported eject, for example, but we don't.
*/
if (out->type & VIRTIO_BLK_T_SCSI_CMD) {
if (out.type & VIRTIO_BLK_T_SCSI_CMD) {
fprintf(stderr, "Scsi commands unsupported\n");
*in = VIRTIO_BLK_S_UNSUPP;
wlen = sizeof(*in);
} else if (out->type & VIRTIO_BLK_T_OUT) {
} else if (out.type & VIRTIO_BLK_T_OUT) {
/*
* Write
*
@ -1636,10 +1623,10 @@ static void blk_request(struct virtqueue *vq)
* if they try to write past end.
*/
if (lseek64(vblk->fd, off, SEEK_SET) != off)
err(1, "Bad seek to sector %llu", out->sector);
err(1, "Bad seek to sector %llu", out.sector);
ret = writev(vblk->fd, iov+1, out_num-1);
verbose("WRITE to sector %llu: %i\n", out->sector, ret);
ret = writev(vblk->fd, iov, out_num);
verbose("WRITE to sector %llu: %i\n", out.sector, ret);
/*
* Grr... Now we know how long the descriptor they sent was, we
@ -1655,7 +1642,7 @@ static void blk_request(struct virtqueue *vq)
wlen = sizeof(*in);
*in = (ret >= 0 ? VIRTIO_BLK_S_OK : VIRTIO_BLK_S_IOERR);
} else if (out->type & VIRTIO_BLK_T_FLUSH) {
} else if (out.type & VIRTIO_BLK_T_FLUSH) {
/* Flush */
ret = fdatasync(vblk->fd);
verbose("FLUSH fdatasync: %i\n", ret);
@ -1669,10 +1656,9 @@ static void blk_request(struct virtqueue *vq)
* if they try to read past end.
*/
if (lseek64(vblk->fd, off, SEEK_SET) != off)
err(1, "Bad seek to sector %llu", out->sector);
err(1, "Bad seek to sector %llu", out.sector);
ret = readv(vblk->fd, iov+1, in_num-1);
verbose("READ from sector %llu: %i\n", out->sector, ret);
ret = readv(vblk->fd, iov + out_num, in_num);
if (ret >= 0) {
wlen = sizeof(*in) + ret;
*in = VIRTIO_BLK_S_OK;
@ -1758,7 +1744,7 @@ static void rng_input(struct virtqueue *vq)
len = readv(rng_info->rfd, iov, in_num);
if (len <= 0)
err(1, "Read from /dev/random gave %i", len);
iov_consume(iov, in_num, len);
iov_consume(iov, in_num, NULL, len);
totlen += len;
}

4
tools/virtio/virtio_test.c
View File

@ -164,7 +164,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
r = virtqueue_add_buf(vq->vq, &sl, 1, 0,
dev->buf + started,
GFP_ATOMIC);
if (likely(r >= 0)) {
if (likely(r == 0)) {
++started;
virtqueue_kick(vq->vq);
}
@ -177,7 +177,7 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq,
r = 0;
}
} while (r >= 0);
} while (r == 0);
if (completed == completed_before)
++spurious;
assert(completed <= bufs);