From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [RFC v2 1/2] virtio: add pmem driver Date: Wed, 25 Apr 2018 17:52:47 +0300 Message-ID: <20180425174705-mutt-send-email-mst@kernel.org> References: <20180425112415.12327-1-pagupta@redhat.com> <20180425112415.12327-2-pagupta@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20180425112415.12327-2-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: Pankaj Gupta Cc: kwolf-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, lcapitulino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, jack-AlSwsSmVLrQ@public.gmane.org, xiaoguangrong.eric-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, riel-ebMLmSuQjDVBDgjK7y7TUQ@public.gmane.org, linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org, david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, ross.zwisler-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org, hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, imammedo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, stefanha-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, niteshnarayanlal-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org, marcel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, nilal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org List-Id: linux-nvdimm@lists.01.org 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 > +#include > +#include > +#include > +#include > + > + > +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