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

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Date:   Wed, 12 Feb 2020 10:58:13 +0800
From:   "Liu, Jing2" <jing2.liu@...ux.intel.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Zha Bin <zhabin@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org, jasowang@...hat.com, slp@...hat.com,
        virtio-dev@...ts.oasis-open.org, qemu-devel@...gnu.org,
        gerry@...ux.alibaba.com, chao.p.peng@...ux.intel.com
Subject: Re: [virtio-dev] Re: [PATCH v2 2/5] virtio-mmio: refactor common
 functionality


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@...ux.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@...ux.alibaba.com>
>> Co-developed-by: Zha Bin <zhabin@...ux.alibaba.com>
>> Signed-off-by: Zha Bin <zhabin@...ux.alibaba.com>
>> Co-developed-by: Jing Liu <jing2.liu@...ux.intel.com>
>> Signed-off-by: Jing Liu <jing2.liu@...ux.intel.com>
>> Co-developed-by: Chao Peng <chao.p.peng@...ux.intel.com>
>> Signed-off-by: Chao Peng <chao.p.peng@...ux.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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