linux-kernel - [RFC Patch] virtio: export model and type in /sys

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Date:	Mon, 31 Jan 2011 10:53:00 +0800
From:	Amerigo Wang <amwang@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	WANG Cong <amwang@...hat.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Anthony Liguori <aliguori@...ibm.com>,
	Jamie Lokier <jamie@...reable.org>,
	Thomas Weber <swirl@....li>,
	Ben Hutchings <ben@...adent.org.uk>,
	David Woodhouse <David.Woodhouse@...el.com>,
	Andy Fleming <afleming@...escale.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [RFC Patch] virtio: export model and type in /sys

Our kdump script needs /sys/block/X/device/{vendor, model, type},
but virtio devices don't have {model, type}, this patch adds them.
Actually, I don't know how to fill the model field, other block devices
seem read it from SCSI. Any comments?

Signed-off-by: WANG Cong <amwang@...hat.com>

---
diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index efb35aa..5ce70b7 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -17,6 +17,18 @@ static ssize_t vendor_show(struct device *_d,
 	struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
 	return sprintf(buf, "0x%04x\n", dev->id.vendor);
 }
+static ssize_t model_show(struct device *_d,
+			   struct device_attribute *attr, char *buf)
+{
+	struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
+	return sprintf(buf, "0x%04x\n", dev->id.model);
+}
+static ssize_t type_show(struct device *_d,
+			   struct device_attribute *attr, char *buf)
+{
+	struct virtio_device *dev = container_of(_d,struct virtio_device,dev);
+	return sprintf(buf, "0x%04x\n", dev->id.type);
+}
 static ssize_t status_show(struct device *_d,
 			   struct device_attribute *attr, char *buf)
 {
@@ -49,6 +61,8 @@ static ssize_t features_show(struct device *_d,
 static struct device_attribute virtio_dev_attrs[] = {
 	__ATTR_RO(device),
 	__ATTR_RO(vendor),
+	__ATTR_RO(model),
+	__ATTR_RO(type),
 	__ATTR_RO(status),
 	__ATTR_RO(modalias),
 	__ATTR_RO(features),
diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c
index 4fb5b2b..3bde99d 100644
--- a/drivers/virtio/virtio_pci.c
+++ b/drivers/virtio/virtio_pci.c
@@ -656,6 +656,7 @@ static int __devinit virtio_pci_probe(struct pci_dev *pci_dev,
 	 * the subsystem ids */
 	vp_dev->vdev.id.vendor = pci_dev->subsystem_vendor;
 	vp_dev->vdev.id.device = pci_dev->subsystem_device;
+	vp_dev->vdev.id.type = pci_dev->pcie_type;
 
 	/* finally register the virtio device */
 	err = register_virtio_device(&vp_dev->vdev);
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 48c007d..b72cd50 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -385,6 +385,8 @@ struct ssb_device_id {
 struct virtio_device_id {
 	__u32 device;
 	__u32 vendor;
+	__u32 model;
+	__u32 type;
 };
 #define VIRTIO_DEV_ANY_ID	0xffffffff
 
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