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

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Date:   Wed, 25 Apr 2018 11:11:09 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     kwolf@...hat.com, haozhong zhang <haozhong.zhang@...el.com>,
        lcapitulino@...hat.com, jack@...e.cz,
        xiaoguangrong eric <xiaoguangrong.eric@...il.com>,
        kvm@...r.kernel.org, riel@...riel.com, linux-nvdimm@...1.01.org,
        david@...hat.com, ross zwisler <ross.zwisler@...el.com>,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        hch@...radead.org, linux-mm@...ck.org, imammedo@...hat.com,
        stefanha@...hat.com, niteshnarayanlal@...mail.com,
        marcel@...hat.com, pbonzini@...hat.com,
        dan j williams <dan.j.williams@...el.com>, nilal@...hat.com
Subject: Re: [Qemu-devel] [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.

O.K Will create virtio spec and follow the procedure.
 
> 
> 
> > 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.

o.k

> 
> > +	uint64_t start;
> > +	uint64_t size;
> 
> Used LE fields for everything.

o.k

> 
> > +};
> > +
> > +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.

o.k

> 
> > +
> > +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.

o.k.

Thanks,
Pankaj