linux-kernel - [PATCH 4/6] xenbus: process otherend_watch event at 'state' entry in xenwatch multithreading

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Date:   Fri, 14 Sep 2018 15:34:14 +0800
From:   Dongli Zhang <dongli.zhang@...cle.com>
To:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     boris.ostrovsky@...cle.com, jgross@...e.com,
        paul.durrant@...rix.com, wei.liu2@...rix.com,
        konrad.wilk@...cle.com, roger.pau@...rix.com,
        srinivas.eeda@...cle.com
Subject: [PATCH 4/6] xenbus: process otherend_watch event at 'state' entry in xenwatch multithreading

This is the 4th patch of a (6-patch) patch set.

With this patch, watch event in absolute path pattern
'/local/domain/<domid>/device/<pvdev>/<handle>/state' can be processed in
per-domU xenwatch thread.

Signed-off-by: Dongli Zhang <dongli.zhang@...cle.com>
---
 drivers/xen/xenbus/xenbus_probe.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/xen/xenbus/xenbus_probe.c b/drivers/xen/xenbus/xenbus_probe.c
index 5755596..ba0644c 100644
--- a/drivers/xen/xenbus/xenbus_probe.c
+++ b/drivers/xen/xenbus/xenbus_probe.c
@@ -129,11 +129,27 @@ static int talk_to_otherend(struct xenbus_device *dev)
 }
 
 
+static domid_t otherend_get_domid(struct xenbus_watch *watch,
+				  const char *path,
+				  const char *token)
+{
+	struct xenbus_device *xendev =
+		container_of(watch, struct xenbus_device, otherend_watch);
+
+	return xendev->otherend_id;
+}
+
 
 static int watch_otherend(struct xenbus_device *dev)
 {
 	struct xen_bus_type *bus =
 		container_of(dev->dev.bus, struct xen_bus_type, bus);
+	struct xenbus_driver *drv = to_xenbus_driver(dev->dev.driver);
+
+	if (xen_mtwatch && drv->use_mtwatch) {
+		dev->otherend_watch.get_domid = otherend_get_domid;
+		dev->otherend_watch.owner_id = dev->otherend_id;
+	}
 
 	return xenbus_watch_pathfmt(dev, &dev->otherend_watch,
 				    bus->otherend_changed,
-- 
2.7.4