linux-kernel - Re: [RFC v2 1/2] virtio: add pmem driver

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Date:   Wed, 25 Apr 2018 17:52:47 +0300
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Pankaj Gupta <pagupta@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        qemu-devel@...gnu.org, linux-nvdimm@...1.01.org,
        linux-mm@...ck.org, jack@...e.cz, stefanha@...hat.com,
        dan.j.williams@...el.com, riel@...riel.com,
        haozhong.zhang@...el.com, nilal@...hat.com, kwolf@...hat.com,
        pbonzini@...hat.com, ross.zwisler@...el.com, david@...hat.com,
        xiaoguangrong.eric@...il.com, hch@...radead.org, marcel@...hat.com,
        niteshnarayanlal@...mail.com, imammedo@...hat.com,
        lcapitulino@...hat.com
Subject: Re: [RFC v2 1/2] virtio: add pmem driver

On Wed, Apr 25, 2018 at 04:54:13PM +0530, Pankaj Gupta wrote:
> diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h
> index 6d5c3b2..5ebd049 100644
> --- a/include/uapi/linux/virtio_ids.h
> +++ b/include/uapi/linux/virtio_ids.h
> @@ -43,5 +43,6 @@
>  #define VIRTIO_ID_INPUT        18 /* virtio input */
>  #define VIRTIO_ID_VSOCK        19 /* virtio vsock transport */
>  #define VIRTIO_ID_CRYPTO       20 /* virtio crypto */
> +#define VIRTIO_ID_PMEM         21 /* virtio pmem */
>  
>  #endif /* _LINUX_VIRTIO_IDS_H */

Please register the device id with virtio TC.


> diff --git a/include/uapi/linux/virtio_pmem.h b/include/uapi/linux/virtio_pmem.h
> new file mode 100644
> index 0000000..2ec27cb
> --- /dev/null
> +++ b/include/uapi/linux/virtio_pmem.h
> @@ -0,0 +1,58 @@
> +/* Virtio pmem Driver
> + *
> + * Discovers persitent memory range information
> + * from host and provides a virtio based flushing
> + * interface.
> + */
> +
> +#ifndef _LINUX_VIRTIO_PMEM_H
> +#define _LINUX_VIRTIO_PMEM_H
> +
> +#include <linux/types.h>
> +#include <linux/virtio_types.h>
> +#include <linux/virtio_ids.h>
> +#include <linux/virtio_config.h>
> +#include <linux/virtio_ring.h>
> +
> +
> +struct virtio_pmem_config {
> +

don't add empty lines pls.

> +	uint64_t start;
> +	uint64_t size;

Used LE fields for everything.

> +};
> +
> +struct virtio_pmem {
> +
> +	struct virtio_device *vdev;
> +	struct virtqueue *req_vq;
> +
> +	uint64_t start;
> +	uint64_t size;
> +} __packed;

This does not belong in uapi, and should not be packed either.

> +
> +static struct virtio_device_id id_table[] = {
> +	{ VIRTIO_ID_PMEM, VIRTIO_DEV_ANY_ID },
> +	{ 0 },
> +};
> +
> +void virtio_pmem_flush(struct device *dev)
> +{
> +	struct scatterlist sg;
> +	struct virtio_device *vdev  = dev_to_virtio(dev->parent->parent);
> +	struct virtio_pmem   *vpmem = vdev->priv;
> +	char *buf = "FLUSH";
> +	int err;
> +
> +	sg_init_one(&sg, buf, sizeof(buf));
> +
> +	err = virtqueue_add_outbuf(vpmem->req_vq, &sg, 1, buf, GFP_KERNEL);
> +
> +	if (err) {
> +		dev_err(&vdev->dev, "failed to send command to virtio pmem device\n");
> +		return;
> +	}
> +
> +	virtqueue_kick(vpmem->req_vq);
> +};

this doesn't belong in uapi.

> +
> +#endif
> -- 
> 2.9.3