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Subject[RFC 2/2] pmem: device flush over VIRTIO
Date
 This patch adds functionality to perform flush
from guest to host over VIRTIO when 'ND_REGION_VIRTIO'
flag is set on nd_negion. This flag is set by 'virtio-pmem'
driver for virtio flush operation.

Signed-off-by: Pankaj Gupta <pagupta@redhat.com>
---
drivers/nvdimm/region_devs.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index abaf38c..1c6cd2a 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -20,6 +20,7 @@
#include <linux/nd.h>
#include "nd-core.h"
#include "nd.h"
+#include <linux/virtio_pmem.h>

/*
* For readq() and writeq() on 32-bit builds, the hi-lo, lo-hi order is
@@ -1043,6 +1044,12 @@ void nvdimm_flush(struct nd_region *nd_region)
struct nd_region_data *ndrd = dev_get_drvdata(&nd_region->dev);
int i, idx;

+ /* call PV device flush */
+ if (test_bit(ND_REGION_VIRTIO, &nd_region->flags)) {
+ virtio_pmem_flush(&nd_region->dev);
+ return;
+ }
+
/*
* Try to encourage some diversity in flush hint addresses
* across cpus assuming a limited number of flush hints.
--
2.9.3
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