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virtio, vhost: optimizations, fixes 

Looks like a quiet cycle for vhost/virtio, just a couple of minor
 tweaks. Most notable is automatic interrupt affinity for blk and scsi.
 Hopefully other devices are not far behind.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull vhost updates from Michael Tsirkin:
 "virtio, vhost: optimizations, fixes

  Looks like a quiet cycle for vhost/virtio, just a couple of minor
  tweaks. Most notable is automatic interrupt affinity for blk and scsi.
  Hopefully other devices are not far behind"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio-console: avoid DMA from stack
  vhost: introduce O(1) vq metadata cache
  virtio_scsi: use virtio IRQ affinity
  virtio_blk: use virtio IRQ affinity
  blk-mq: provide a default queue mapping for virtio device
  virtio: provide a method to get the IRQ affinity mask for a virtqueue
  virtio: allow drivers to request IRQ affinity when creating VQs
  virtio_pci: simplify MSI-X setup
  virtio_pci: don't duplicate the msix_enable flag in struct pci_dev
  virtio_pci: use shared interrupts for virtqueues
  virtio_pci: remove struct virtio_pci_vq_info
  vhost: try avoiding avail index access when getting descriptor
  virtio_mmio: expose header to userspace
This commit is contained in:
Linus Torvalds 2017-03-02 13:53:13 -08:00
parent 0f221a3102 c4baad5029
commit 54d7989f47
31 changed files with 460 additions and 458 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
block/Kconfig
View File

@ -189,4 +189,9 @@ config BLK_MQ_PCI
depends on BLOCK && PCI
default y
config BLK_MQ_VIRTIO
bool
depends on BLOCK && VIRTIO
default y
source block/Kconfig.iosched

1
block/Makefile
View File

@ -25,6 +25,7 @@ obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o
obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o
obj-$(CONFIG_BLK_MQ_PCI) += blk-mq-pci.o
obj-$(CONFIG_BLK_MQ_VIRTIO) += blk-mq-virtio.o
obj-$(CONFIG_BLK_DEV_ZONED) += blk-zoned.o
obj-$(CONFIG_BLK_WBT) += blk-wbt.o
obj-$(CONFIG_BLK_DEBUG_FS) += blk-mq-debugfs.o

54
block/blk-mq-virtio.c Normal file
View File

@ -0,0 +1,54 @@
/*
* Copyright (c) 2016 Christoph Hellwig.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/device.h>
#include <linux/blk-mq.h>
#include <linux/blk-mq-virtio.h>
#include <linux/virtio_config.h>
#include <linux/module.h>
#include "blk-mq.h"
/**
* blk_mq_virtio_map_queues - provide a default queue mapping for virtio device
* @set: tagset to provide the mapping for
* @vdev: virtio device associated with @set.
* @first_vec: first interrupt vectors to use for queues (usually 0)
*
* This function assumes the virtio device @vdev has at least as many available
* interrupt vetors as @set has queues. It will then queuery the vector
* corresponding to each queue for it's affinity mask and built queue mapping
* that maps a queue to the CPUs that have irq affinity for the corresponding
* vector.
*/
int blk_mq_virtio_map_queues(struct blk_mq_tag_set *set,
struct virtio_device *vdev, int first_vec)
{
const struct cpumask *mask;
unsigned int queue, cpu;
if (!vdev->config->get_vq_affinity)
goto fallback;
for (queue = 0; queue < set->nr_hw_queues; queue++) {
mask = vdev->config->get_vq_affinity(vdev, first_vec + queue);
if (!mask)
goto fallback;
for_each_cpu(cpu, mask)
set->mq_map[cpu] = queue;
}
return 0;
fallback:
return blk_mq_map_queues(set);
}
EXPORT_SYMBOL_GPL(blk_mq_virtio_map_queues);

14
drivers/block/virtio_blk.c
View File

@ -5,6 +5,7 @@
#include <linux/hdreg.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/virtio.h>
#include <linux/virtio_blk.h>
#include <linux/scatterlist.h>
@ -12,6 +13,7 @@
#include <scsi/scsi_cmnd.h>
#include <linux/idr.h>
#include <linux/blk-mq.h>
#include <linux/blk-mq-virtio.h>
#include <linux/numa.h>
#define PART_BITS 4
@ -426,6 +428,7 @@ static int init_vq(struct virtio_blk *vblk)
struct virtqueue **vqs;
unsigned short num_vqs;
struct virtio_device *vdev = vblk->vdev;
struct irq_affinity desc = { 0, };
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
struct virtio_blk_config, num_queues,
@ -452,7 +455,8 @@ static int init_vq(struct virtio_blk *vblk)
}
/* Discover virtqueues and write information to configuration. */
err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names,
&desc);
if (err)
goto out;
@ -586,10 +590,18 @@ static int virtblk_init_request(void *data, struct request *rq,
return 0;
}
static int virtblk_map_queues(struct blk_mq_tag_set *set)
{
struct virtio_blk *vblk = set->driver_data;
return blk_mq_virtio_map_queues(set, vblk->vdev, 0);
}
static struct blk_mq_ops virtio_mq_ops = {
.queue_rq = virtio_queue_rq,
.complete = virtblk_request_done,
.init_request = virtblk_init_request,
.map_queues = virtblk_map_queues,
};
static unsigned int virtblk_queue_depth;

14
drivers/char/virtio_console.c
View File

@ -1136,6 +1136,8 @@ static int put_chars(u32 vtermno, const char *buf, int count)
{
struct port *port;
struct scatterlist sg[1];
void *data;
int ret;
if (unlikely(early_put_chars))
return early_put_chars(vtermno, buf, count);
@ -1144,8 +1146,14 @@ static int put_chars(u32 vtermno, const char *buf, int count)
if (!port)
return -EPIPE;
sg_init_one(sg, buf, count);
return __send_to_port(port, sg, 1, count, (void *)buf, false);
data = kmemdup(buf, count, GFP_ATOMIC);
if (!data)
return -ENOMEM;
sg_init_one(sg, data, count);
ret = __send_to_port(port, sg, 1, count, data, false);
kfree(data);
return ret;
}
/*
@ -1939,7 +1947,7 @@ static int init_vqs(struct ports_device *portdev)
/* Find the queues. */
err = portdev->vdev->config->find_vqs(portdev->vdev, nr_queues, vqs,
io_callbacks,
(const char **)io_names);
(const char **)io_names, NULL);
if (err)
goto free;

2
drivers/crypto/virtio/virtio_crypto_core.c
View File

@ -120,7 +120,7 @@ static int virtcrypto_find_vqs(struct virtio_crypto *vi)
}
ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
names);
names, NULL);
if (ret)
goto err_find;

2
drivers/gpu/drm/virtio/virtgpu_kms.c
View File

@ -176,7 +176,7 @@ int virtio_gpu_driver_load(struct drm_device *dev, unsigned long flags)
#endif
ret = vgdev->vdev->config->find_vqs(vgdev->vdev, 2, vqs,
callbacks, names);
callbacks, names, NULL);
if (ret) {
DRM_ERROR("failed to find virt queues\n");
goto err_vqs;

2
drivers/misc/mic/vop/vop_main.c
View File

@ -374,7 +374,7 @@ unmap:
static int vop_find_vqs(struct virtio_device *dev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
const char * const names[], struct irq_affinity *desc)
{
struct _vop_vdev *vdev = to_vopvdev(dev);
struct vop_device *vpdev = vdev->vpdev;

3
drivers/net/caif/caif_virtio.c
View File

@ -679,7 +679,8 @@ static int cfv_probe(struct virtio_device *vdev)
goto err;
/* Get the TX virtio ring. This is a "guest side vring". */
err = vdev->config->find_vqs(vdev, 1, &cfv->vq_tx, &vq_cbs, &names);
err = vdev->config->find_vqs(vdev, 1, &cfv->vq_tx, &vq_cbs, &names,
NULL);
if (err)
goto err;

2
drivers/net/virtio_net.c
View File

@ -2080,7 +2080,7 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
}
ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
names);
names, NULL);
if (ret)
goto err_find;

3
drivers/remoteproc/remoteproc_virtio.c
View File

@ -137,7 +137,8 @@ static void rproc_virtio_del_vqs(struct virtio_device *vdev)
static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
const char * const names[],
struct irq_affinity *desc)
{
int i, ret;

2
drivers/rpmsg/virtio_rpmsg_bus.c
View File

@ -869,7 +869,7 @@ static int rpmsg_probe(struct virtio_device *vdev)
init_waitqueue_head(&vrp->sendq);
/* We expect two virtqueues, rx and tx (and in this order) */
err = vdev->config->find_vqs(vdev, 2, vqs, vq_cbs, names);
err = vdev->config->find_vqs(vdev, 2, vqs, vq_cbs, names, NULL);
if (err)
goto free_vrp;

3
drivers/s390/virtio/kvm_virtio.c
View File

@ -255,7 +255,8 @@ static void kvm_del_vqs(struct virtio_device *vdev)
static int kvm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
const char * const names[],
struct irq_affinity *desc)
{
struct kvm_device *kdev = to_kvmdev(vdev);
int i;

3
drivers/s390/virtio/virtio_ccw.c
View File

@ -628,7 +628,8 @@ out:
static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
const char * const names[],
struct irq_affinity *desc)
{
struct virtio_ccw_device *vcdev = to_vc_device(vdev);
unsigned long *indicatorp = NULL;

127
drivers/scsi/virtio_scsi.c
View File

@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mempool.h>
#include <linux/interrupt.h>
#include <linux/virtio.h>
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
@ -29,6 +30,7 @@
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_tcq.h>
#include <linux/seqlock.h>
#include <linux/blk-mq-virtio.h>
#define VIRTIO_SCSI_MEMPOOL_SZ 64
#define VIRTIO_SCSI_EVENT_LEN 8
@ -108,7 +110,6 @@ struct virtio_scsi {
bool affinity_hint_set;
struct hlist_node node;
struct hlist_node node_dead;
/* Protected by event_vq lock */
bool stop_events;
@ -118,7 +119,6 @@ struct virtio_scsi {
struct virtio_scsi_vq req_vqs[];
};
static enum cpuhp_state virtioscsi_online;
static struct kmem_cache *virtscsi_cmd_cache;
static mempool_t *virtscsi_cmd_pool;
@ -766,6 +766,13 @@ static void virtscsi_target_destroy(struct scsi_target *starget)
kfree(tgt);
}
static int virtscsi_map_queues(struct Scsi_Host *shost)
{
struct virtio_scsi *vscsi = shost_priv(shost);
return blk_mq_virtio_map_queues(&shost->tag_set, vscsi->vdev, 2);
}
static struct scsi_host_template virtscsi_host_template_single = {
.module = THIS_MODULE,
.name = "Virtio SCSI HBA",
@ -801,6 +808,7 @@ static struct scsi_host_template virtscsi_host_template_multi = {
.use_clustering = ENABLE_CLUSTERING,
.target_alloc = virtscsi_target_alloc,
.target_destroy = virtscsi_target_destroy,
.map_queues = virtscsi_map_queues,
.track_queue_depth = 1,
};
@ -817,80 +825,6 @@ static struct scsi_host_template virtscsi_host_template_multi = {
virtio_cwrite(vdev, struct virtio_scsi_config, fld, &__val); \
} while(0)
static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity)
{
int i;
int cpu;
/* In multiqueue mode, when the number of cpu is equal
* to the number of request queues, we let the qeueues
* to be private to one cpu by setting the affinity hint
* to eliminate the contention.
*/
if ((vscsi->num_queues == 1 ||
vscsi->num_queues != num_online_cpus()) && affinity) {
if (vscsi->affinity_hint_set)
affinity = false;
else
return;
}
if (affinity) {
i = 0;
for_each_online_cpu(cpu) {
virtqueue_set_affinity(vscsi->req_vqs[i].vq, cpu);
i++;
}
vscsi->affinity_hint_set = true;
} else {
for (i = 0; i < vscsi->num_queues; i++) {
if (!vscsi->req_vqs[i].vq)
continue;
virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1);
}
vscsi->affinity_hint_set = false;
}
}
static void virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity)
{
get_online_cpus();
__virtscsi_set_affinity(vscsi, affinity);
put_online_cpus();
}
static int virtscsi_cpu_online(unsigned int cpu, struct hlist_node *node)
{
struct virtio_scsi *vscsi = hlist_entry_safe(node, struct virtio_scsi,
node);
__virtscsi_set_affinity(vscsi, true);
return 0;
}
static int virtscsi_cpu_notif_add(struct virtio_scsi *vi)
{
int ret;
ret = cpuhp_state_add_instance(virtioscsi_online, &vi->node);
if (ret)
return ret;
ret = cpuhp_state_add_instance(CPUHP_VIRT_SCSI_DEAD, &vi->node_dead);
if (ret)
cpuhp_state_remove_instance(virtioscsi_online, &vi->node);
return ret;
}
static void virtscsi_cpu_notif_remove(struct virtio_scsi *vi)
{
cpuhp_state_remove_instance_nocalls(virtioscsi_online, &vi->node);
cpuhp_state_remove_instance_nocalls(CPUHP_VIRT_SCSI_DEAD,
&vi->node_dead);
}
static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
struct virtqueue *vq)
{
@ -900,14 +834,8 @@ static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
static void virtscsi_remove_vqs(struct virtio_device *vdev)
{
struct Scsi_Host *sh = virtio_scsi_host(vdev);
struct virtio_scsi *vscsi = shost_priv(sh);
virtscsi_set_affinity(vscsi, false);
/* Stop all the virtqueues. */
vdev->config->reset(vdev);
vdev->config->del_vqs(vdev);
}
@ -920,6 +848,7 @@ static int virtscsi_init(struct virtio_device *vdev,
vq_callback_t **callbacks;
const char **names;
struct virtqueue **vqs;
struct irq_affinity desc = { .pre_vectors = 2 };
num_vqs = vscsi->num_queues + VIRTIO_SCSI_VQ_BASE;
vqs = kmalloc(num_vqs * sizeof(struct virtqueue *), GFP_KERNEL);
@ -941,7 +870,8 @@ static int virtscsi_init(struct virtio_device *vdev,
}
/* Discover virtqueues and write information to configuration. */
err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names,
&desc);
if (err)
goto out;
@ -1007,10 +937,6 @@ static int virtscsi_probe(struct virtio_device *vdev)
if (err)
goto virtscsi_init_failed;
err = virtscsi_cpu_notif_add(vscsi);
if (err)
goto scsi_add_host_failed;
cmd_per_lun = virtscsi_config_get(vdev, cmd_per_lun) ?: 1;
shost->cmd_per_lun = min_t(u32, cmd_per_lun, shost->can_queue);
shost->max_sectors = virtscsi_config_get(vdev, max_sectors) ?: 0xFFFF;
@ -1065,9 +991,6 @@ static void virtscsi_remove(struct virtio_device *vdev)
virtscsi_cancel_event_work(vscsi);
scsi_remove_host(shost);
virtscsi_cpu_notif_remove(vscsi);
virtscsi_remove_vqs(vdev);
scsi_host_put(shost);
}
@ -1075,10 +998,6 @@ static void virtscsi_remove(struct virtio_device *vdev)
#ifdef CONFIG_PM_SLEEP
static int virtscsi_freeze(struct virtio_device *vdev)
{
struct Scsi_Host *sh = virtio_scsi_host(vdev);
struct virtio_scsi *vscsi = shost_priv(sh);
virtscsi_cpu_notif_remove(vscsi);
virtscsi_remove_vqs(vdev);
return 0;
}
@ -1093,11 +1012,6 @@ static int virtscsi_restore(struct virtio_device *vdev)
if (err)
return err;
err = virtscsi_cpu_notif_add(vscsi);
if (err) {
vdev->config->del_vqs(vdev);
return err;
}
virtio_device_ready(vdev);
if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
@ -1152,16 +1066,6 @@ static int __init init(void)
pr_err("mempool_create() for virtscsi_cmd_pool failed\n");
goto error;
}
ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN,
"scsi/virtio:online",
virtscsi_cpu_online, NULL);
if (ret < 0)
goto error;
virtioscsi_online = ret;
ret = cpuhp_setup_state_multi(CPUHP_VIRT_SCSI_DEAD, "scsi/virtio:dead",
NULL, virtscsi_cpu_online);
if (ret)
goto error;
ret = register_virtio_driver(&virtio_scsi_driver);
if (ret < 0)
goto error;
@ -1177,17 +1081,12 @@ error:
kmem_cache_destroy(virtscsi_cmd_cache);
virtscsi_cmd_cache = NULL;
}
if (virtioscsi_online)
cpuhp_remove_multi_state(virtioscsi_online);
cpuhp_remove_multi_state(CPUHP_VIRT_SCSI_DEAD);
return ret;
}
static void __exit fini(void)
{
unregister_virtio_driver(&virtio_scsi_driver);
cpuhp_remove_multi_state(virtioscsi_online);
cpuhp_remove_multi_state(CPUHP_VIRT_SCSI_DEAD);
mempool_destroy(virtscsi_cmd_pool);
kmem_cache_destroy(virtscsi_cmd_cache);
}

177
drivers/vhost/vhost.c
View File

@ -282,6 +282,22 @@ void vhost_poll_queue(struct vhost_poll *poll)
}
EXPORT_SYMBOL_GPL(vhost_poll_queue);
static void __vhost_vq_meta_reset(struct vhost_virtqueue *vq)
{
int j;
for (j = 0; j < VHOST_NUM_ADDRS; j++)
vq->meta_iotlb[j] = NULL;
}
static void vhost_vq_meta_reset(struct vhost_dev *d)
{
int i;
for (i = 0; i < d->nvqs; ++i)
__vhost_vq_meta_reset(d->vqs[i]);
}
static void vhost_vq_reset(struct vhost_dev *dev,
struct vhost_virtqueue *vq)
{
@ -312,6 +328,7 @@ static void vhost_vq_reset(struct vhost_dev *dev,
vq->busyloop_timeout = 0;
vq->umem = NULL;
vq->iotlb = NULL;
__vhost_vq_meta_reset(vq);
}
static int vhost_worker(void *data)
@ -691,6 +708,18 @@ static int vq_memory_access_ok(void __user *log_base, struct vhost_umem *umem,
return 1;
}
static inline void __user *vhost_vq_meta_fetch(struct vhost_virtqueue *vq,
u64 addr, unsigned int size,
int type)
{
const struct vhost_umem_node *node = vq->meta_iotlb[type];
if (!node)
return NULL;
return (void *)(uintptr_t)(node->userspace_addr + addr - node->start);
}
/* Can we switch to this memory table? */
/* Caller should have device mutex but not vq mutex */
static int memory_access_ok(struct vhost_dev *d, struct vhost_umem *umem,
@ -733,8 +762,14 @@ static int vhost_copy_to_user(struct vhost_virtqueue *vq, void __user *to,
* could be access through iotlb. So -EAGAIN should
* not happen in this case.
*/
/* TODO: more fast path */
struct iov_iter t;
void __user *uaddr = vhost_vq_meta_fetch(vq,
(u64)(uintptr_t)to, size,
VHOST_ADDR_DESC);
if (uaddr)
return __copy_to_user(uaddr, from, size);
ret = translate_desc(vq, (u64)(uintptr_t)to, size, vq->iotlb_iov,
ARRAY_SIZE(vq->iotlb_iov),
VHOST_ACCESS_WO);
@ -762,8 +797,14 @@ static int vhost_copy_from_user(struct vhost_virtqueue *vq, void *to,
* could be access through iotlb. So -EAGAIN should
* not happen in this case.
*/
/* TODO: more fast path */
void __user *uaddr = vhost_vq_meta_fetch(vq,
(u64)(uintptr_t)from, size,
VHOST_ADDR_DESC);
struct iov_iter f;
if (uaddr)
return __copy_from_user(to, uaddr, size);
ret = translate_desc(vq, (u64)(uintptr_t)from, size, vq->iotlb_iov,
ARRAY_SIZE(vq->iotlb_iov),
VHOST_ACCESS_RO);
@ -783,17 +824,12 @@ out:
return ret;
}
static void __user *__vhost_get_user(struct vhost_virtqueue *vq,
void __user *addr, unsigned size)
static void __user *__vhost_get_user_slow(struct vhost_virtqueue *vq,
void __user *addr, unsigned int size,
int type)
{
int ret;
/* This function should be called after iotlb
* prefetch, which means we're sure that vq
* could be access through iotlb. So -EAGAIN should
* not happen in this case.
*/
/* TODO: more fast path */
ret = translate_desc(vq, (u64)(uintptr_t)addr, size, vq->iotlb_iov,
ARRAY_SIZE(vq->iotlb_iov),
VHOST_ACCESS_RO);
@ -814,14 +850,32 @@ static void __user *__vhost_get_user(struct vhost_virtqueue *vq,
return vq->iotlb_iov[0].iov_base;
}
#define vhost_put_user(vq, x, ptr) \
/* This function should be called after iotlb
* prefetch, which means we're sure that vq
* could be access through iotlb. So -EAGAIN should
* not happen in this case.
*/
static inline void __user *__vhost_get_user(struct vhost_virtqueue *vq,
void *addr, unsigned int size,
int type)
{
void __user *uaddr = vhost_vq_meta_fetch(vq,
(u64)(uintptr_t)addr, size, type);
if (uaddr)
return uaddr;
return __vhost_get_user_slow(vq, addr, size, type);
}
#define vhost_put_user(vq, x, ptr) \
({ \
int ret = -EFAULT; \
if (!vq->iotlb) { \
ret = __put_user(x, ptr); \
} else { \
__typeof__(ptr) to = \
(__typeof__(ptr)) __vhost_get_user(vq, ptr, sizeof(*ptr)); \
(__typeof__(ptr)) __vhost_get_user(vq, ptr, \
sizeof(*ptr), VHOST_ADDR_USED); \
if (to != NULL) \
ret = __put_user(x, to); \
else \
@ -830,14 +884,16 @@ static void __user *__vhost_get_user(struct vhost_virtqueue *vq,
ret; \
})
#define vhost_get_user(vq, x, ptr) \
#define vhost_get_user(vq, x, ptr, type) \
({ \
int ret; \
if (!vq->iotlb) { \
ret = __get_user(x, ptr); \
} else { \
__typeof__(ptr) from = \
(__typeof__(ptr)) __vhost_get_user(vq, ptr, sizeof(*ptr)); \
(__typeof__(ptr)) __vhost_get_user(vq, ptr, \
sizeof(*ptr), \
type); \
if (from != NULL) \
ret = __get_user(x, from); \
else \
@ -846,6 +902,12 @@ static void __user *__vhost_get_user(struct vhost_virtqueue *vq,
ret; \
})
#define vhost_get_avail(vq, x, ptr) \
vhost_get_user(vq, x, ptr, VHOST_ADDR_AVAIL)
#define vhost_get_used(vq, x, ptr) \
vhost_get_user(vq, x, ptr, VHOST_ADDR_USED)
static void vhost_dev_lock_vqs(struct vhost_dev *d)
{
int i = 0;
@ -951,6 +1013,7 @@ static int vhost_process_iotlb_msg(struct vhost_dev *dev,
ret = -EFAULT;
break;
}
vhost_vq_meta_reset(dev);
if (vhost_new_umem_range(dev->iotlb, msg->iova, msg->size,
msg->iova + msg->size - 1,
msg->uaddr, msg->perm)) {
@ -960,6 +1023,7 @@ static int vhost_process_iotlb_msg(struct vhost_dev *dev,
vhost_iotlb_notify_vq(dev, msg);
break;
case VHOST_IOTLB_INVALIDATE:
vhost_vq_meta_reset(dev);
vhost_del_umem_range(dev->iotlb, msg->iova,
msg->iova + msg->size - 1);
break;
@ -1103,12 +1167,26 @@ static int vq_access_ok(struct vhost_virtqueue *vq, unsigned int num,
sizeof *used + num * sizeof *used->ring + s);
}
static void vhost_vq_meta_update(struct vhost_virtqueue *vq,
const struct vhost_umem_node *node,
int type)
{
int access = (type == VHOST_ADDR_USED) ?
VHOST_ACCESS_WO : VHOST_ACCESS_RO;
if (likely(node->perm & access))
vq->meta_iotlb[type] = node;
}
static int iotlb_access_ok(struct vhost_virtqueue *vq,
int access, u64 addr, u64 len)
int access, u64 addr, u64 len, int type)
{
const struct vhost_umem_node *node;
struct vhost_umem *umem = vq->iotlb;
u64 s = 0, size;
u64 s = 0, size, orig_addr = addr;
if (vhost_vq_meta_fetch(vq, addr, len, type))
return true;
while (len > s) {
node = vhost_umem_interval_tree_iter_first(&umem->umem_tree,
@ -1125,6 +1203,10 @@ static int iotlb_access_ok(struct vhost_virtqueue *vq,
}
size = node->size - addr + node->start;
if (orig_addr == addr && size >= len)
vhost_vq_meta_update(vq, node, type);
s += size;
addr += size;
}
@ -1141,13 +1223,15 @@ int vq_iotlb_prefetch(struct vhost_virtqueue *vq)
return 1;
return iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->desc,
num * sizeof *vq->desc) &&
num * sizeof(*vq->desc), VHOST_ADDR_DESC) &&
iotlb_access_ok(vq, VHOST_ACCESS_RO, (u64)(uintptr_t)vq->avail,
sizeof *vq->avail +
num * sizeof *vq->avail->ring + s) &&
num * sizeof(*vq->avail->ring) + s,
VHOST_ADDR_AVAIL) &&
iotlb_access_ok(vq, VHOST_ACCESS_WO, (u64)(uintptr_t)vq->used,
sizeof *vq->used +
num * sizeof *vq->used->ring + s);
num * sizeof(*vq->used->ring) + s,
VHOST_ADDR_USED);
}
EXPORT_SYMBOL_GPL(vq_iotlb_prefetch);
@ -1728,7 +1812,7 @@ int vhost_vq_init_access(struct vhost_virtqueue *vq)
r = -EFAULT;
goto err;
}
r = vhost_get_user(vq, last_used_idx, &vq->used->idx);
r = vhost_get_used(vq, last_used_idx, &vq->used->idx);
if (r) {
vq_err(vq, "Can't access used idx at %p\n",
&vq->used->idx);
@ -1930,29 +2014,36 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
/* Check it isn't doing very strange things with descriptor numbers. */
last_avail_idx = vq->last_avail_idx;
if (unlikely(vhost_get_user(vq, avail_idx, &vq->avail->idx))) {
vq_err(vq, "Failed to access avail idx at %p\n",
&vq->avail->idx);
return -EFAULT;
if (vq->avail_idx == vq->last_avail_idx) {
if (unlikely(vhost_get_avail(vq, avail_idx, &vq->avail->idx))) {
vq_err(vq, "Failed to access avail idx at %p\n",
&vq->avail->idx);
return -EFAULT;
}
vq->avail_idx = vhost16_to_cpu(vq, avail_idx);
if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) {
vq_err(vq, "Guest moved used index from %u to %u",
last_avail_idx, vq->avail_idx);
return -EFAULT;
}
/* If there's nothing new since last we looked, return
* invalid.
*/
if (vq->avail_idx == last_avail_idx)
return vq->num;
/* Only get avail ring entries after they have been
* exposed by guest.
*/
smp_rmb();
}
vq->avail_idx = vhost16_to_cpu(vq, avail_idx);
if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) {
vq_err(vq, "Guest moved used index from %u to %u",
last_avail_idx, vq->avail_idx);
return -EFAULT;
}
/* If there's nothing new since last we looked, return invalid. */
if (vq->avail_idx == last_avail_idx)
return vq->num;
/* Only get avail ring entries after they have been exposed by guest. */
smp_rmb();
/* Grab the next descriptor number they're advertising, and increment
* the index we've seen. */
if (unlikely(vhost_get_user(vq, ring_head,
if (unlikely(vhost_get_avail(vq, ring_head,
&vq->avail->ring[last_avail_idx & (vq->num - 1)]))) {
vq_err(vq, "Failed to read head: idx %d address %p\n",
last_avail_idx,
@ -2168,7 +2259,7 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
* with the barrier that the Guest executes when enabling
* interrupts. */
smp_mb();
if (vhost_get_user(vq, flags, &vq->avail->flags)) {
if (vhost_get_avail(vq, flags, &vq->avail->flags)) {
vq_err(vq, "Failed to get flags");
return true;
}
@ -2195,7 +2286,7 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
* interrupts. */
smp_mb();
if (vhost_get_user(vq, event, vhost_used_event(vq))) {
if (vhost_get_avail(vq, event, vhost_used_event(vq))) {
vq_err(vq, "Failed to get used event idx");
return true;
}
@ -2242,7 +2333,7 @@ bool vhost_vq_avail_empty(struct vhost_dev *dev, struct vhost_virtqueue *vq)
if (vq->avail_idx != vq->last_avail_idx)
return false;
r = vhost_get_user(vq, avail_idx, &vq->avail->idx);
r = vhost_get_avail(vq, avail_idx, &vq->avail->idx);
if (unlikely(r))
return false;
vq->avail_idx = vhost16_to_cpu(vq, avail_idx);
@ -2278,7 +2369,7 @@ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
/* They could have slipped one in as we were doing that: make
* sure it's written, then check again. */
smp_mb();
r = vhost_get_user(vq, avail_idx, &vq->avail->idx);
r = vhost_get_avail(vq, avail_idx, &vq->avail->idx);
if (r) {
vq_err(vq, "Failed to check avail idx at %p: %d\n",
&vq->avail->idx, r);

8
drivers/vhost/vhost.h
View File

@ -76,6 +76,13 @@ struct vhost_umem {
int numem;
};
enum vhost_uaddr_type {
VHOST_ADDR_DESC = 0,
VHOST_ADDR_AVAIL = 1,
VHOST_ADDR_USED = 2,
VHOST_NUM_ADDRS = 3,
};
/* The virtqueue structure describes a queue attached to a device. */
struct vhost_virtqueue {
struct vhost_dev *dev;
@ -86,6 +93,7 @@ struct vhost_virtqueue {
struct vring_desc __user *desc;
struct vring_avail __user *avail;
struct vring_used __user *used;
const struct vhost_umem_node *meta_iotlb[VHOST_NUM_ADDRS];
struct file *kick;
struct file *call;
struct file *error;

3
drivers/virtio/virtio_balloon.c
View File

@ -413,7 +413,8 @@ static int init_vqs(struct virtio_balloon *vb)
* 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);
err = vb->vdev->config->find_vqs(vb->vdev, nvqs, vqs, callbacks, names,
NULL);
if (err)
return err;

3
drivers/virtio/virtio_input.c
View File

@ -173,7 +173,8 @@ static int virtinput_init_vqs(struct virtio_input *vi)
static const char * const names[] = { "events", "status" };
int err;
err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names);
err = vi->vdev->config->find_vqs(vi->vdev, 2, vqs, cbs, names,
NULL);
if (err)
return err;
vi->evt = vqs[0];

5
drivers/virtio/virtio_mmio.c
View File

@ -70,7 +70,7 @@
#include <linux/spinlock.h>
#include <linux/virtio.h>
#include <linux/virtio_config.h>
#include <linux/virtio_mmio.h>
#include <uapi/linux/virtio_mmio.h>
#include <linux/virtio_ring.h>
@ -446,7 +446,8 @@ error_available:
static int vm_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
const char * const names[],
struct irq_affinity *desc)
{
struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
unsigned int irq = platform_get_irq(vm_dev->pdev, 0);

380
drivers/virtio/virtio_pci_common.c
View File

@ -33,10 +33,8 @@ void vp_synchronize_vectors(struct virtio_device *vdev)
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled)
synchronize_irq(vp_dev->pci_dev->irq);
for (i = 0; i < vp_dev->msix_vectors; ++i)
synchronize_irq(pci_irq_vector(vp_dev->pci_dev, 0));
for (i = 1; i < vp_dev->msix_vectors; i++)
synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i));
}
@ -62,16 +60,13 @@ static irqreturn_t vp_config_changed(int irq, void *opaque)
static irqreturn_t vp_vring_interrupt(int irq, void *opaque)
{
struct virtio_pci_device *vp_dev = opaque;
struct virtio_pci_vq_info *info;
irqreturn_t ret = IRQ_NONE;
unsigned long flags;
struct virtqueue *vq;
spin_lock_irqsave(&vp_dev->lock, flags);
list_for_each_entry(info, &vp_dev->virtqueues, node) {
if (vring_interrupt(irq, info->vq) == IRQ_HANDLED)
list_for_each_entry(vq, &vp_dev->vdev.vqs, list) {
if (vq->callback && vring_interrupt(irq, vq) == IRQ_HANDLED)
ret = IRQ_HANDLED;
}
spin_unlock_irqrestore(&vp_dev->lock, flags);
return ret;
}
@ -102,237 +97,185 @@ static irqreturn_t vp_interrupt(int irq, void *opaque)
return vp_vring_interrupt(irq, opaque);
}
static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
bool per_vq_vectors)
static void vp_remove_vqs(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev);
unsigned i, v;
int err = -ENOMEM;
struct virtqueue *vq, *n;
vp_dev->msix_vectors = nvectors;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
if (vp_dev->msix_vector_map) {
int v = vp_dev->msix_vector_map[vq->index];
vp_dev->msix_names = kmalloc(nvectors * sizeof *vp_dev->msix_names,
GFP_KERNEL);
if (!vp_dev->msix_names)
goto error;
vp_dev->msix_affinity_masks
= kzalloc(nvectors * sizeof *vp_dev->msix_affinity_masks,
GFP_KERNEL);
if (!vp_dev->msix_affinity_masks)
goto error;
for (i = 0; i < nvectors; ++i)
if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
GFP_KERNEL))
goto error;
err = pci_alloc_irq_vectors(vp_dev->pci_dev, nvectors, nvectors,
PCI_IRQ_MSIX);
if (err < 0)
goto error;
vp_dev->msix_enabled = 1;
/* Set the vector used for configuration */
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-config", name);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
vp_config_changed, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
++vp_dev->msix_used_vectors;
v = vp_dev->config_vector(vp_dev, v);
/* Verify we had enough resources to assign the vector */
if (v == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto error;
if (v != VIRTIO_MSI_NO_VECTOR)
free_irq(pci_irq_vector(vp_dev->pci_dev, v),
vq);
}
vp_dev->del_vq(vq);
}
if (!per_vq_vectors) {
/* Shared vector for all VQs */
v = vp_dev->msix_used_vectors;
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-virtqueues", name);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
vp_vring_interrupt, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
++vp_dev->msix_used_vectors;
}
return 0;
error:
return err;
}
static struct virtqueue *vp_setup_vq(struct virtio_device *vdev, unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info = kmalloc(sizeof *info, GFP_KERNEL);
struct virtqueue *vq;
unsigned long flags;
/* fill out our structure that represents an active queue */
if (!info)
return ERR_PTR(-ENOMEM);
vq = vp_dev->setup_vq(vp_dev, info, index, callback, name, msix_vec);
if (IS_ERR(vq))
goto out_info;
info->vq = vq;
if (callback) {
spin_lock_irqsave(&vp_dev->lock, flags);
list_add(&info->node, &vp_dev->virtqueues);
spin_unlock_irqrestore(&vp_dev->lock, flags);
} else {
INIT_LIST_HEAD(&info->node);
}
vp_dev->vqs[index] = info;
return vq;
out_info:
kfree(info);
return vq;
}
static void vp_del_vq(struct virtqueue *vq)
{
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
unsigned long flags;
spin_lock_irqsave(&vp_dev->lock, flags);
list_del(&info->node);
spin_unlock_irqrestore(&vp_dev->lock, flags);
vp_dev->del_vq(info);
kfree(info);
}
/* the config->del_vqs() implementation */
void vp_del_vqs(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtqueue *vq, *n;
int i;
list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
if (vp_dev->per_vq_vectors) {
int v = vp_dev->vqs[vq->index]->msix_vector;
if (WARN_ON_ONCE(list_empty_careful(&vdev->vqs)))
return;
if (v != VIRTIO_MSI_NO_VECTOR)
free_irq(pci_irq_vector(vp_dev->pci_dev, v),
vq);
}
vp_del_vq(vq);
}
vp_dev->per_vq_vectors = false;
vp_remove_vqs(vdev);
if (vp_dev->intx_enabled) {
free_irq(vp_dev->pci_dev->irq, vp_dev);
vp_dev->intx_enabled = 0;
}
for (i = 0; i < vp_dev->msix_used_vectors; ++i)
free_irq(pci_irq_vector(vp_dev->pci_dev, i), vp_dev);
for (i = 0; i < vp_dev->msix_vectors; i++)
if (vp_dev->msix_affinity_masks[i])
if (vp_dev->pci_dev->msix_enabled) {
for (i = 0; i < vp_dev->msix_vectors; i++)
free_cpumask_var(vp_dev->msix_affinity_masks[i]);
if (vp_dev->msix_enabled) {
/* Disable the vector used for configuration */
vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
pci_free_irq_vectors(vp_dev->pci_dev);
vp_dev->msix_enabled = 0;
kfree(vp_dev->msix_affinity_masks);
kfree(vp_dev->msix_names);
kfree(vp_dev->msix_vector_map);
}
vp_dev->msix_vectors = 0;
vp_dev->msix_used_vectors = 0;
kfree(vp_dev->msix_names);
vp_dev->msix_names = NULL;
kfree(vp_dev->msix_affinity_masks);
vp_dev->msix_affinity_masks = NULL;
kfree(vp_dev->vqs);
vp_dev->vqs = NULL;
free_irq(pci_irq_vector(vp_dev->pci_dev, 0), vp_dev);
pci_free_irq_vectors(vp_dev->pci_dev);
}
static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[],
bool per_vq_vectors)
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], struct irq_affinity *desc)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
const char *name = dev_name(&vp_dev->vdev.dev);
int i, err = -ENOMEM, allocated_vectors, nvectors;
unsigned flags = PCI_IRQ_MSIX;
bool shared = false;
u16 msix_vec;
int i, err, nvectors, allocated_vectors;
vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
if (!vp_dev->vqs)
return -ENOMEM;
if (per_vq_vectors) {
/* Best option: one for change interrupt, one per vq. */
nvectors = 1;
for (i = 0; i < nvqs; ++i)
if (callbacks[i])
++nvectors;
} else {
/* Second best: one for change, shared for all vqs. */
nvectors = 2;
if (desc) {
flags |= PCI_IRQ_AFFINITY;
desc->pre_vectors++; /* virtio config vector */
}
err = vp_request_msix_vectors(vdev, nvectors, per_vq_vectors);
if (err)
goto error_find;
nvectors = 1;
for (i = 0; i < nvqs; i++)
if (callbacks[i])
nvectors++;
vp_dev->per_vq_vectors = per_vq_vectors;
allocated_vectors = vp_dev->msix_used_vectors;
/* Try one vector per queue first. */
err = pci_alloc_irq_vectors_affinity(vp_dev->pci_dev, nvectors,
nvectors, flags, desc);
if (err < 0) {
/* Fallback to one vector for config, one shared for queues. */
shared = true;
err = pci_alloc_irq_vectors(vp_dev->pci_dev, 2, 2,
PCI_IRQ_MSIX);
if (err < 0)
return err;
}
if (err < 0)
return err;
vp_dev->msix_vectors = nvectors;
vp_dev->msix_names = kmalloc_array(nvectors,
sizeof(*vp_dev->msix_names), GFP_KERNEL);
if (!vp_dev->msix_names)
goto out_free_irq_vectors;
vp_dev->msix_affinity_masks = kcalloc(nvectors,
sizeof(*vp_dev->msix_affinity_masks), GFP_KERNEL);
if (!vp_dev->msix_affinity_masks)
goto out_free_msix_names;
for (i = 0; i < nvectors; ++i) {
if (!alloc_cpumask_var(&vp_dev->msix_affinity_masks[i],
GFP_KERNEL))
goto out_free_msix_affinity_masks;
}
/* Set the vector used for configuration */
snprintf(vp_dev->msix_names[0], sizeof(*vp_dev->msix_names),
"%s-config", name);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, 0), vp_config_changed,
0, vp_dev->msix_names[0], vp_dev);
if (err)
goto out_free_msix_affinity_masks;
/* Verify we had enough resources to assign the vector */
if (vp_dev->config_vector(vp_dev, 0) == VIRTIO_MSI_NO_VECTOR) {
err = -EBUSY;
goto out_free_config_irq;
}
vp_dev->msix_vector_map = kmalloc_array(nvqs,
sizeof(*vp_dev->msix_vector_map), GFP_KERNEL);
if (!vp_dev->msix_vector_map)
goto out_disable_config_irq;
allocated_vectors = 1; /* vector 0 is the config interrupt */
for (i = 0; i < nvqs; ++i) {
if (!names[i]) {
vqs[i] = NULL;
continue;
}
if (!callbacks[i])
msix_vec = VIRTIO_MSI_NO_VECTOR;
else if (vp_dev->per_vq_vectors)
msix_vec = allocated_vectors++;
if (callbacks[i])
msix_vec = allocated_vectors;
else
msix_vec = VP_MSIX_VQ_VECTOR;
vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i], msix_vec);
msix_vec = VIRTIO_MSI_NO_VECTOR;
vqs[i] = vp_dev->setup_vq(vp_dev, i, callbacks[i], names[i],
msix_vec);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto error_find;
goto out_remove_vqs;
}
if (!vp_dev->per_vq_vectors || msix_vec == VIRTIO_MSI_NO_VECTOR)
if (msix_vec == VIRTIO_MSI_NO_VECTOR) {
vp_dev->msix_vector_map[i] = VIRTIO_MSI_NO_VECTOR;
continue;
}
/* allocate per-vq irq if available and necessary */
snprintf(vp_dev->msix_names[msix_vec],
sizeof *vp_dev->msix_names,
"%s-%s",
snprintf(vp_dev->msix_names[i + 1],
sizeof(*vp_dev->msix_names), "%s-%s",
dev_name(&vp_dev->vdev.dev), names[i]);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
vring_interrupt, 0,
vp_dev->msix_names[msix_vec],
vqs[i]);
if (err)
goto error_find;
vring_interrupt, IRQF_SHARED,
vp_dev->msix_names[i + 1], vqs[i]);
if (err) {
/* don't free this irq on error */
vp_dev->msix_vector_map[i] = VIRTIO_MSI_NO_VECTOR;
goto out_remove_vqs;
}
vp_dev->msix_vector_map[i] = msix_vec;
/*
* Use a different vector for each queue if they are available,
* else share the same vector for all VQs.
*/
if (!shared)
allocated_vectors++;
}
return 0;
error_find:
vp_del_vqs(vdev);
out_remove_vqs:
vp_remove_vqs(vdev);
kfree(vp_dev->msix_vector_map);
out_disable_config_irq:
vp_dev->config_vector(vp_dev, VIRTIO_MSI_NO_VECTOR);
out_free_config_irq:
free_irq(pci_irq_vector(vp_dev->pci_dev, 0), vp_dev);
out_free_msix_affinity_masks:
for (i = 0; i < nvectors; i++) {
if (vp_dev->msix_affinity_masks[i])
free_cpumask_var(vp_dev->msix_affinity_masks[i]);
}
kfree(vp_dev->msix_affinity_masks);
out_free_msix_names:
kfree(vp_dev->msix_names);
out_free_irq_vectors:
pci_free_irq_vectors(vp_dev->pci_dev);
return err;
}
@ -343,53 +286,42 @@ static int vp_find_vqs_intx(struct virtio_device *vdev, unsigned nvqs,
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i, err;
vp_dev->vqs = kcalloc(nvqs, sizeof(*vp_dev->vqs), GFP_KERNEL);
if (!vp_dev->vqs)
return -ENOMEM;
err = request_irq(vp_dev->pci_dev->irq, vp_interrupt, IRQF_SHARED,
dev_name(&vdev->dev), vp_dev);
if (err)
goto out_del_vqs;
return err;
vp_dev->intx_enabled = 1;
vp_dev->per_vq_vectors = false;
for (i = 0; i < nvqs; ++i) {
if (!names[i]) {
vqs[i] = NULL;
continue;
}
vqs[i] = vp_setup_vq(vdev, i, callbacks[i], names[i],
vqs[i] = vp_dev->setup_vq(vp_dev, i, callbacks[i], names[i],
VIRTIO_MSI_NO_VECTOR);
if (IS_ERR(vqs[i])) {
err = PTR_ERR(vqs[i]);
goto out_del_vqs;
goto out_remove_vqs;
}
}
return 0;
out_del_vqs:
vp_del_vqs(vdev);
out_remove_vqs:
vp_remove_vqs(vdev);
free_irq(pci_irq_vector(vp_dev->pci_dev, 0), vp_dev);
return err;
}
/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], struct irq_affinity *desc)
{
int err;
/* Try MSI-X with one vector per queue. */
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, true);
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, desc);
if (!err)
return 0;
/* Fallback: MSI-X with one vector for config, one shared for queues. */
err = vp_find_vqs_msix(vdev, nvqs, vqs, callbacks, names, false);
if (!err)
return 0;
/* Finally fall back to regular interrupts. */
return vp_find_vqs_intx(vdev, nvqs, vqs, callbacks, names);
}
@ -409,16 +341,15 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
{
struct virtio_device *vdev = vq->vdev;
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
struct cpumask *mask;
unsigned int irq;
if (!vq->callback)
return -EINVAL;
if (vp_dev->msix_enabled) {
mask = vp_dev->msix_affinity_masks[info->msix_vector];
irq = pci_irq_vector(vp_dev->pci_dev, info->msix_vector);
if (vp_dev->pci_dev->msix_enabled) {
int vec = vp_dev->msix_vector_map[vq->index];
struct cpumask *mask = vp_dev->msix_affinity_masks[vec];
unsigned int irq = pci_irq_vector(vp_dev->pci_dev, vec);
if (cpu == -1)
irq_set_affinity_hint(irq, NULL);
else {
@ -430,6 +361,17 @@ int vp_set_vq_affinity(struct virtqueue *vq, int cpu)
return 0;
}
const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
unsigned int *map = vp_dev->msix_vector_map;
if (!map || map[index] == VIRTIO_MSI_NO_VECTOR)
return NULL;
return pci_irq_get_affinity(vp_dev->pci_dev, map[index]);
}
#ifdef CONFIG_PM_SLEEP
static int virtio_pci_freeze(struct device *dev)
{
@ -498,8 +440,6 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
vp_dev->vdev.dev.parent = &pci_dev->dev;
vp_dev->vdev.dev.release = virtio_pci_release_dev;
vp_dev->pci_dev = pci_dev;
INIT_LIST_HEAD(&vp_dev->virtqueues);
spin_lock_init(&vp_dev->lock);
/* enable the device */
rc = pci_enable_device(pci_dev);

50
drivers/virtio/virtio_pci_common.h
View File

@ -31,17 +31,6 @@
#include <linux/highmem.h>
#include <linux/spinlock.h>
struct virtio_pci_vq_info {
/* the actual virtqueue */
struct virtqueue *vq;
/* the list node for the virtqueues list */
struct list_head node;
/* MSI-X vector (or none) */
unsigned msix_vector;
};
/* Our device structure */
struct virtio_pci_device {
struct virtio_device vdev;
@ -75,47 +64,25 @@ struct virtio_pci_device {
/* the IO mapping for the PCI config space */
void __iomem *ioaddr;
/* a list of queues so we can dispatch IRQs */
spinlock_t lock;
struct list_head virtqueues;
/* array of all queues for house-keeping */
struct virtio_pci_vq_info **vqs;
/* MSI-X support */
int msix_enabled;
int intx_enabled;
cpumask_var_t *msix_affinity_masks;
/* Name strings for interrupts. This size should be enough,
* and I'm too lazy to allocate each name separately. */
char (*msix_names)[256];
/* Number of available vectors */
unsigned msix_vectors;
/* Vectors allocated, excluding per-vq vectors if any */
unsigned msix_used_vectors;
/* Whether we have vector per vq */
bool per_vq_vectors;
/* Total Number of MSI-X vectors (including per-VQ ones). */
int msix_vectors;
/* Map of per-VQ MSI-X vectors, may be NULL */
unsigned *msix_vector_map;
struct virtqueue *(*setup_vq)(struct virtio_pci_device *vp_dev,
struct virtio_pci_vq_info *info,
unsigned idx,
void (*callback)(struct virtqueue *vq),
const char *name,
u16 msix_vec);
void (*del_vq)(struct virtio_pci_vq_info *info);
void (*del_vq)(struct virtqueue *vq);
u16 (*config_vector)(struct virtio_pci_device *vp_dev, u16 vector);
};
/* Constants for MSI-X */
/* Use first vector for configuration changes, second and the rest for
* virtqueues Thus, we need at least 2 vectors for MSI. */
enum {
VP_MSIX_CONFIG_VECTOR = 0,
VP_MSIX_VQ_VECTOR = 1,
};
/* Convert a generic virtio device to our structure */
static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev)
{
@ -130,9 +97,8 @@ bool vp_notify(struct virtqueue *vq);
void vp_del_vqs(struct virtio_device *vdev);
/* the config->find_vqs() implementation */
int vp_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[]);
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], struct irq_affinity *desc);
const char *vp_bus_name(struct virtio_device *vdev);
/* Setup the affinity for a virtqueue:
@ -142,6 +108,8 @@ const char *vp_bus_name(struct virtio_device *vdev);
*/
int vp_set_vq_affinity(struct virtqueue *vq, int cpu);
const struct cpumask *vp_get_vq_affinity(struct virtio_device *vdev, int index);
#if IS_ENABLED(CONFIG_VIRTIO_PCI_LEGACY)
int virtio_pci_legacy_probe(struct virtio_pci_device *);
void virtio_pci_legacy_remove(struct virtio_pci_device *);

9
drivers/virtio/virtio_pci_legacy.c
View File

@ -112,7 +112,6 @@ static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
}
static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
struct virtio_pci_vq_info *info,
unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
@ -130,8 +129,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
if (!num || ioread32(vp_dev->ioaddr + VIRTIO_PCI_QUEUE_PFN))
return ERR_PTR(-ENOENT);
info->msix_vector = msix_vec;
/* create the vring */
vq = vring_create_virtqueue(index, num,
VIRTIO_PCI_VRING_ALIGN, &vp_dev->vdev,
@ -162,14 +159,13 @@ out_deactivate:
return ERR_PTR(err);
}
static void del_vq(struct virtio_pci_vq_info *info)
static void del_vq(struct virtqueue *vq)
{
struct virtqueue *vq = info->vq;
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
iowrite16(vq->index, vp_dev->ioaddr + VIRTIO_PCI_QUEUE_SEL);
if (vp_dev->msix_enabled) {
if (vp_dev->pci_dev->msix_enabled) {
iowrite16(VIRTIO_MSI_NO_VECTOR,
vp_dev->ioaddr + VIRTIO_MSI_QUEUE_VECTOR);
/* Flush the write out to device */
@ -194,6 +190,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
.get_vq_affinity = vp_get_vq_affinity,
};
/* the PCI probing function */

17
drivers/virtio/virtio_pci_modern.c
View File

@ -293,7 +293,6 @@ static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
}
static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
struct virtio_pci_vq_info *info,
unsigned index,
void (*callback)(struct virtqueue *vq),
const char *name,
@ -323,8 +322,6 @@ static struct virtqueue *setup_vq(struct virtio_pci_device *vp_dev,
/* get offset of notification word for this vq */
off = vp_ioread16(&cfg->queue_notify_off);
info->msix_vector = msix_vec;
/* create the vring */
vq = vring_create_virtqueue(index, num,
SMP_CACHE_BYTES, &vp_dev->vdev,
@ -387,13 +384,12 @@ err_map_notify:
}
static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[])
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], struct irq_affinity *desc)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
struct virtqueue *vq;
int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names);
int rc = vp_find_vqs(vdev, nvqs, vqs, callbacks, names, desc);
if (rc)
return rc;
@ -409,14 +405,13 @@ static int vp_modern_find_vqs(struct virtio_device *vdev, unsigned nvqs,
return 0;
}
static void del_vq(struct virtio_pci_vq_info *info)
static void del_vq(struct virtqueue *vq)
{
struct virtqueue *vq = info->vq;
struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
vp_iowrite16(vq->index, &vp_dev->common->queue_select);
if (vp_dev->msix_enabled) {
if (vp_dev->pci_dev->msix_enabled) {
vp_iowrite16(VIRTIO_MSI_NO_VECTOR,
&vp_dev->common->queue_msix_vector);
/* Flush the write out to device */
@ -442,6 +437,7 @@ static const struct virtio_config_ops virtio_pci_config_nodev_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
.get_vq_affinity = vp_get_vq_affinity,
};
static const struct virtio_config_ops virtio_pci_config_ops = {
@ -457,6 +453,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.finalize_features = vp_finalize_features,
.bus_name = vp_bus_name,
.set_vq_affinity = vp_set_vq_affinity,
.get_vq_affinity = vp_get_vq_affinity,
};
/**

10
include/linux/blk-mq-virtio.h Normal file
View File

@ -0,0 +1,10 @@
#ifndef _LINUX_BLK_MQ_VIRTIO_H
#define _LINUX_BLK_MQ_VIRTIO_H
struct blk_mq_tag_set;
struct virtio_device;
int blk_mq_virtio_map_queues(struct blk_mq_tag_set *set,
struct virtio_device *vdev, int first_vec);
#endif /* _LINUX_BLK_MQ_VIRTIO_H */

1
include/linux/cpuhotplug.h
View File

@ -26,7 +26,6 @@ enum cpuhp_state {
CPUHP_ARM_OMAP_WAKE_DEAD,
CPUHP_IRQ_POLL_DEAD,
CPUHP_BLOCK_SOFTIRQ_DEAD,
CPUHP_VIRT_SCSI_DEAD,
CPUHP_ACPI_CPUDRV_DEAD,
CPUHP_S390_PFAULT_DEAD,
CPUHP_BLK_MQ_DEAD,

12
include/linux/virtio_config.h
View File

@ -7,6 +7,8 @@
#include <linux/virtio_byteorder.h>
#include <uapi/linux/virtio_config.h>
struct irq_affinity;
/**
* virtio_config_ops - operations for configuring a virtio device
* @get: read the value of a configuration field
@ -56,6 +58,7 @@
* This returns a pointer to the bus name a la pci_name from which
* the caller can then copy.
* @set_vq_affinity: set the affinity for a virtqueue.
* @get_vq_affinity: get the affinity for a virtqueue (optional).
*/
typedef void vq_callback_t(struct virtqueue *);
struct virtio_config_ops {
@ -68,14 +71,15 @@ struct virtio_config_ops {
void (*set_status)(struct virtio_device *vdev, u8 status);
void (*reset)(struct virtio_device *vdev);
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char * const names[]);
struct virtqueue *vqs[], vq_callback_t *callbacks[],
const char * const names[], struct irq_affinity *desc);
void (*del_vqs)(struct virtio_device *);
u64 (*get_features)(struct virtio_device *vdev);
int (*finalize_features)(struct virtio_device *vdev);
const char *(*bus_name)(struct virtio_device *vdev);
int (*set_vq_affinity)(struct virtqueue *vq, int cpu);
const struct cpumask *(*get_vq_affinity)(struct virtio_device *vdev,
int index);
};
/* If driver didn't advertise the feature, it will never appear. */
@ -169,7 +173,7 @@ struct virtqueue *virtio_find_single_vq(struct virtio_device *vdev,
vq_callback_t *callbacks[] = { c };
const char *names[] = { n };
struct virtqueue *vq;
int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names);
int err = vdev->config->find_vqs(vdev, 1, &vq, callbacks, names, NULL);
if (err < 0)
return ERR_PTR(err);
return vq;

1
include/uapi/linux/Kbuild
View File

@ -466,6 +466,7 @@ header-y += virtio_console.h
header-y += virtio_gpu.h
header-y += virtio_ids.h
header-y += virtio_input.h
header-y += virtio_mmio.h
header-y += virtio_net.h
header-y += virtio_pci.h
header-y += virtio_ring.h

0
include/linux/virtio_mmio.h → include/uapi/linux/virtio_mmio.h
View File

2
include/uapi/linux/virtio_pci.h
View File

@ -79,7 +79,7 @@
* configuration space */
#define VIRTIO_PCI_CONFIG_OFF(msix_enabled) ((msix_enabled) ? 24 : 20)
/* Deprecated: please use VIRTIO_PCI_CONFIG_OFF instead */
#define VIRTIO_PCI_CONFIG(dev) VIRTIO_PCI_CONFIG_OFF((dev)->msix_enabled)
#define VIRTIO_PCI_CONFIG(dev) VIRTIO_PCI_CONFIG_OFF((dev)->pci_dev->msix_enabled)
/* Virtio ABI version, this must match exactly */
#define VIRTIO_PCI_ABI_VERSION 0

3
net/vmw_vsock/virtio_transport.c
View File

@ -532,7 +532,8 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
vsock->vdev = vdev;
ret = vsock->vdev->config->find_vqs(vsock->vdev, VSOCK_VQ_MAX,
vsock->vqs, callbacks, names);
vsock->vqs, callbacks, names,
NULL);
if (ret < 0)
goto out;