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Date:      Mon, 19 Feb 2018 19:28:24 +0000 (UTC)
From:      Bryan Venteicher <bryanv@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r329601 - head/sys/dev/virtio
Message-ID:  <201802191928.w1JJSOH5091919@repo.freebsd.org>
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Author: bryanv
Date: Mon Feb 19 19:28:24 2018
New Revision: 329601
URL: https://svnweb.freebsd.org/changeset/base/329601

Log:
  Add VirtIO bus config_generation method
  
  VirtIO buses (PCI, MMIO) can provide a generation field so a driver
  can ensure either a 64-bit or array read was stable.
  
  MFC after:	2 weeks

Modified:
  head/sys/dev/virtio/virtio.c
  head/sys/dev/virtio/virtio.h
  head/sys/dev/virtio/virtio_bus_if.m

Modified: head/sys/dev/virtio/virtio.c
==============================================================================
--- head/sys/dev/virtio/virtio.c	Mon Feb 19 19:08:25 2018	(r329600)
+++ head/sys/dev/virtio/virtio.c	Mon Feb 19 19:28:24 2018	(r329601)
@@ -240,6 +240,13 @@ virtio_reinit_complete(device_t dev)
 	VIRTIO_BUS_REINIT_COMPLETE(device_get_parent(dev));
 }
 
+int
+virtio_config_generation(device_t dev)
+{
+
+	return (VIRTIO_BUS_CONFIG_GENERATION(device_get_parent(dev)));
+}
+
 void
 virtio_read_device_config(device_t dev, bus_size_t offset, void *dst, int len)
 {

Modified: head/sys/dev/virtio/virtio.h
==============================================================================
--- head/sys/dev/virtio/virtio.h	Mon Feb 19 19:08:25 2018	(r329600)
+++ head/sys/dev/virtio/virtio.h	Mon Feb 19 19:28:24 2018	(r329601)
@@ -78,6 +78,7 @@ int	 virtio_alloc_virtqueues(device_t dev, int flags, 
 int	 virtio_setup_intr(device_t dev, enum intr_type type);
 int	 virtio_with_feature(device_t dev, uint64_t feature);
 void	 virtio_stop(device_t dev);
+int	 virtio_config_generation(device_t dev);
 int	 virtio_reinit(device_t dev, uint64_t features);
 void	 virtio_reinit_complete(device_t dev);
 

Modified: head/sys/dev/virtio/virtio_bus_if.m
==============================================================================
--- head/sys/dev/virtio/virtio_bus_if.m	Mon Feb 19 19:08:25 2018	(r329600)
+++ head/sys/dev/virtio/virtio_bus_if.m	Mon Feb 19 19:28:24 2018	(r329601)
@@ -34,6 +34,14 @@ HEADER {
 struct vq_alloc_info;
 };
 
+CODE {
+	static int
+	virtio_bus_default_config_generation(device_t dev)
+	{
+		return (0);
+	}
+};
+
 METHOD uint64_t negotiate_features {
 	device_t	dev;
 	uint64_t	child_features;
@@ -73,6 +81,10 @@ METHOD void notify_vq {
 	device_t	dev;
 	uint16_t	queue;
 };
+
+METHOD int config_generation {
+	device_t	dev;
+} DEFAULT virtio_bus_default_config_generation;
 
 METHOD void read_device_config {
 	device_t	dev;

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