Re: [virtio-dev] Re: [PATCH v2 2/5] virtio-mmio: refactor common functionality

["Liu, Jing2" <jing2.liu@linux.intel.com>]

On 2/11/2020 7:19 PM, Michael S. Tsirkin wrote:
> On Mon, Feb 10, 2020 at 05:05:18PM +0800, Zha Bin wrote:
> > From: Liu Jiang <gerry@linux.alibaba.com>
> >
> > Common functionality is refactored into virtio_mmio_common.h
> > in order to MSI support in later patch set.
> >
> > Signed-off-by: Liu Jiang <gerry@linux.alibaba.com>
> > Co-developed-by: Zha Bin <zhabin@linux.alibaba.com>
> > Signed-off-by: Zha Bin <zhabin@linux.alibaba.com>
> > Co-developed-by: Jing Liu <jing2.liu@linux.intel.com>
> > Signed-off-by: Jing Liu <jing2.liu@linux.intel.com>
> > Co-developed-by: Chao Peng <chao.p.peng@linux.intel.com>
> > Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
> What does this proliferation of header files achieve?
> common with what?

We're considering that the virtio mmio structure is useful for virtio 
mmio msi file so refactor out.

e.g. to get the base of virtio_mmio_device from struct msi_desc *desc.

Jing


> > ---
> >   drivers/virtio/virtio_mmio.c        | 21 +--------------------
> >   drivers/virtio/virtio_mmio_common.h | 31 +++++++++++++++++++++++++++++++
> >   2 files changed, 32 insertions(+), 20 deletions(-)
> >   create mode 100644 drivers/virtio/virtio_mmio_common.h
> >
> > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> > index 1733ab97..41e1c93 100644
> > --- a/drivers/virtio/virtio_mmio.c
> > +++ b/drivers/virtio/virtio_mmio.c
> > @@ -61,13 +61,12 @@
> >   #include <linux/io.h>
> >   #include <linux/list.h>
> >   #include <linux/module.h>
> > -#include <linux/platform_device.h>
> >   #include <linux/slab.h>
> >   #include <linux/spinlock.h>
> > -#include <linux/virtio.h>
> >   #include <linux/virtio_config.h>
> >   #include <uapi/linux/virtio_mmio.h>
> >   #include <linux/virtio_ring.h>
> > +#include "virtio_mmio_common.h"
> >   
> >   
> >   
> > @@ -77,24 +76,6 @@
> >   
> >   
> >   
> > -#define to_virtio_mmio_device(_plat_dev) \
> > -	container_of(_plat_dev, struct virtio_mmio_device, vdev)
> > -
> > -struct virtio_mmio_device {
> > -	struct virtio_device vdev;
> > -	struct platform_device *pdev;
> > -
> > -	void __iomem *base;
> > -	unsigned long version;
> > -
> > -	/* a list of queues so we can dispatch IRQs */
> > -	spinlock_t lock;
> > -	struct list_head virtqueues;
> > -
> > -	unsigned short notify_base;
> > -	unsigned short notify_multiplier;
> > -};
> > -
> >   struct virtio_mmio_vq_info {
> >   	/* the actual virtqueue */
> >   	struct virtqueue *vq;
> > diff --git a/drivers/virtio/virtio_mmio_common.h b/drivers/virtio/virtio_mmio_common.h
> > new file mode 100644
> > index 0000000..90cb304
> > --- /dev/null
> > +++ b/drivers/virtio/virtio_mmio_common.h
> > @@ -0,0 +1,31 @@
> > +/* SPDX-License-Identifier: GPL-2.0-or-later */
> > +#ifndef _DRIVERS_VIRTIO_VIRTIO_MMIO_COMMON_H
> > +#define _DRIVERS_VIRTIO_VIRTIO_MMIO_COMMON_H
> > +/*
> > + * Virtio MMIO driver - common functionality for all device versions
> > + *
> > + * This module allows virtio devices to be used over a memory-mapped device.
> > + */
> > +
> > +#include <linux/platform_device.h>
> > +#include <linux/virtio.h>
> > +
> > +#define to_virtio_mmio_device(_plat_dev) \
> > +	container_of(_plat_dev, struct virtio_mmio_device, vdev)
> > +
> > +struct virtio_mmio_device {
> > +	struct virtio_device vdev;
> > +	struct platform_device *pdev;
> > +
> > +	void __iomem *base;
> > +	unsigned long version;
> > +
> > +	/* a list of queues so we can dispatch IRQs */
> > +	spinlock_t lock;
> > +	struct list_head virtqueues;
> > +
> > +	unsigned short notify_base;
> > +	unsigned short notify_multiplier;
> > +};
> > +
> > +#endif
> > --
> > 1.8.3.1
>
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