linux-kernel - [RFC 2/2] pmem: device flush over VIRTIO

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Message-Id: <20180405104834.10457-3-pagupta@redhat.com>
Date:   Thu,  5 Apr 2018 16:18:33 +0530
From:   Pankaj Gupta <pagupta@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        qemu-devel@...gnu.org, linux-nvdimm@...1.01.org
Cc:     jack@...e.cz, stefanha@...hat.com, dan.j.williams@...el.com,
        riel@...riel.com, haozhong.zhang@...el.com, nilal@...hat.com,
        kwolf@...hat.com, pbonzini@...hat.com, ross.zwisler@...el.com,
        david@...hat.com, xiaoguangrong.eric@...il.com, hch@...radead.org,
        marcel@...hat.com, mst@...hat.com, niteshnarayanlal@...mail.com,
        imammedo@...hat.com, pagupta@...hat.com
Subject: [RFC 2/2] pmem: device flush over VIRTIO

 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@...hat.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