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virtio: barrier rework+fixes

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This adds a new kind of barrier, and reworks virtio and xen
 to use it.
 Plus some fixes here and there.
 
 Signed-off-by: Michael S. Tsirkin <[email protected]>
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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

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
commit a200dcb346
44 changed files with 401 additions and 319 deletions
Download patch file Download diff file Expand all files Collapse all files

3
drivers/xen/events/events_fifo.c
View file

@ -41,6 +41,7 @@
#include <linux/percpu.h>
#include <linux/cpu.h>
#include <asm/barrier.h>
#include <asm/sync_bitops.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
@ -296,7 +297,7 @@ static void consume_one_event(unsigned cpu,
* control block.
*/
if (head == 0) {
rmb(); /* Ensure word is up-to-date before reading head. */
virt_rmb(); /* Ensure word is up-to-date before reading head. */
head = control_block->head[priority];
}

8
drivers/xen/xenbus/xenbus_comms.c
View file

@ -123,14 +123,14 @@ int xb_write(const void *data, unsigned len)
avail = len;
/* Must write data /after/ reading the consumer index. */
mb();
virt_mb();
memcpy(dst, data, avail);
data += avail;
len -= avail;
/* Other side must not see new producer until data is there. */
wmb();
virt_wmb();
intf->req_prod += avail;
/* Implies mb(): other side will see the updated producer. */
@ -180,14 +180,14 @@ int xb_read(void *data, unsigned len)
avail = len;
/* Must read data /after/ reading the producer index. */
rmb();
virt_rmb();
memcpy(data, src, avail);
data += avail;
len -= avail;
/* Other side must not see free space until we've copied out */
mb();
virt_mb();
intf->rsp_cons += avail;
pr_debug("Finished read of %i bytes (%i to go)\n", avail, len);