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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

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Pull virtio barrier rework+fixes from Michael Tsirkin:
 "This adds a new kind of barrier, and reworks virtio and xen to use it.

  Plus some fixes here and there"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (44 commits)
  checkpatch: add virt barriers
  checkpatch: check for __smp outside barrier.h
  checkpatch.pl: add missing memory barriers
  virtio: make find_vqs() checkpatch.pl-friendly
  virtio_balloon: fix race between migration and ballooning
  virtio_balloon: fix race by fill and leak
  s390: more efficient smp barriers
  s390: use generic memory barriers
  xen/events: use virt_xxx barriers
  xen/io: use virt_xxx barriers
  xenbus: use virt_xxx barriers
  virtio_ring: use virt_store_mb
  sh: move xchg_cmpxchg to a header by itself
  sh: support 1 and 2 byte xchg
  virtio_ring: update weak barriers to use virt_xxx
  Revert "virtio_ring: Update weak barriers to use dma_wmb/rmb"
  asm-generic: implement virt_xxx memory barriers
  x86: define __smp_xxx
  xtensa: define __smp_xxx
  tile: define __smp_xxx
  ...
This commit is contained in:
Linus Torvalds
2016-01-18 16:44:24 -08:00
parent d05d82f711 43e361f23c
commit a200dcb346
44 changed files with 400 additions and 318 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/virtio_config.h
View File

@@ -70,7 +70,7 @@ struct virtio_config_ops {
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
struct virtqueue *vqs[],
vq_callback_t *callbacks[],
const char *names[]);
const char * const names[]);
void (*del_vqs)(struct virtio_device *);
u64 (*get_features)(struct virtio_device *vdev);
int (*finalize_features)(struct virtio_device *vdev);

21
include/linux/virtio_ring.h
View File

@@ -12,7 +12,7 @@
* anyone care?
*
* For virtio_pci on SMP, we don't need to order with respect to MMIO
* accesses through relaxed memory I/O windows, so smp_mb() et al are
* accesses through relaxed memory I/O windows, so virt_mb() et al are
* sufficient.
*
* For using virtio to talk to real devices (eg. other heterogeneous
@@ -23,18 +23,16 @@
static inline void virtio_mb(bool weak_barriers)
{
#ifdef CONFIG_SMP
if (weak_barriers)
smp_mb();
virt_mb();
else
#endif
mb();
}
static inline void virtio_rmb(bool weak_barriers)
{
if (weak_barriers)
dma_rmb();
virt_rmb();
else
rmb();
}
@@ -42,11 +40,22 @@ static inline void virtio_rmb(bool weak_barriers)
static inline void virtio_wmb(bool weak_barriers)
{
if (weak_barriers)
dma_wmb();
virt_wmb();
else
wmb();
}
static inline void virtio_store_mb(bool weak_barriers,
__virtio16 *p, __virtio16 v)
{
if (weak_barriers) {
virt_store_mb(*p, v);
} else {
WRITE_ONCE(*p, v);
mb();
}
}
struct virtio_device;
struct virtqueue;