linux-kernel - [PATCH v2 1/2] virtio: introduce little edian functions for virtio

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Date:   Tue, 22 Nov 2016 16:10:22 +0800
From:   Gonglei <arei.gonglei@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <qemu-devel@...gnu.org>,
        <virtio-dev@...ts.oasis-open.org>,
        <virtualization@...ts.linux-foundation.org>,
        <linux-crypto@...r.kernel.org>
CC:     <luonengjun@...wei.com>, <mst@...hat.com>, <stefanha@...hat.com>,
        <weidong.huang@...wei.com>, <wu.wubin@...wei.com>,
        <xin.zeng@...el.com>, <claudio.fontana@...wei.com>,
        <herbert@...dor.apana.org.au>, <pasic@...ux.vnet.ibm.com>,
        <davem@...emloft.net>, <jianjay.zhou@...wei.com>,
        <hanweidong@...wei.com>, <arei.gonglei@...mail.com>,
        <cornelia.huck@...ibm.com>, <xuquan8@...wei.com>,
        <longpeng2@...wei.com>, <salvatore.benedetto@...el.com>,
        Gonglei <arei.gonglei@...wei.com>
Subject: [PATCH v2 1/2] virtio: introduce little edian functions for virtio_cread/write# family

Virtio modern devices are always little edian, let's introduce
the LE functions for read/write configuration space for
virtio modern devices, which avoid complaint by Sparse when
we use the virtio_creaed/virtio_cwrite in VIRTIO_1 devices.

Signed-off-by: Gonglei <arei.gonglei@...wei.com>
---
 include/linux/virtio_config.h | 45 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 26c155b..de05707 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -414,4 +414,49 @@ static inline void virtio_cwrite64(struct virtio_device *vdev,
 		_r;							\
 	})
 
+static inline __le16 virtio_cread16_le(struct virtio_device *vdev,
+				 unsigned int offset)
+{
+	__le16 ret;
+
+	vdev->config->get(vdev, offset, &ret, sizeof(ret));
+	return ret;
+}
+
+static inline void virtio_cwrite16_le(struct virtio_device *vdev,
+				   unsigned int offset, __le16 val)
+{
+	vdev->config->set(vdev, offset, &val, sizeof(val));
+}
+
+static inline __le32 virtio_cread32_le(struct virtio_device *vdev,
+				 unsigned int offset)
+{
+	__le32 ret;
+
+	vdev->config->get(vdev, offset, &ret, sizeof(ret));
+	return ret;
+}
+
+static inline void virtio_cwrite32_le(struct virtio_device *vdev,
+				   unsigned int offset, __le32 val)
+{
+	vdev->config->set(vdev, offset, &val, sizeof(val));
+}
+
+static inline __le64 virtio_cread64_le(struct virtio_device *vdev,
+				 unsigned int offset)
+{
+	__le64 ret;
+
+	__virtio_cread_many(vdev, offset, &ret, 1, sizeof(ret));
+	return ret;
+}
+
+static inline void virtio_cwrite64_le(struct virtio_device *vdev,
+				   unsigned int offset, __le64 val)
+{
+	vdev->config->set(vdev, offset, &val, sizeof(val));
+}
+
 #endif /* _LINUX_VIRTIO_CONFIG_H */
-- 
1.8.3.1