From: Pankaj Gupta <pagupta@redhat.com>
To: David Hildenbrand <david@redhat.com>
Cc: linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-acpi@vger.kernel.org,
qemu-devel@nongnu.org, linux-ext4@vger.kernel.org,
linux-xfs@vger.kernel.org, mst@redhat.com,
dan j williams <dan.j.williams@intel.com>,
zwisler@kernel.org, vishal l verma <vishal.l.verma@intel.com>,
dave jiang <dave.jiang@intel.com>,
jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net,
hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu,
adilger kernel <adilger.kernel@dilger.ca>,
darrick wong <darrick.wong@oracle.com>,
lcapitulino@redhat.com, kwolf@redhat.com, imammedo@redhat.com,
jmoyer@redhat.com, nilal@redhat.com, riel@surriel.com,
stefanha@redhat.com, aarcange@redhat.com, david@fromorbit.com,
cohuck@redhat.com,
xiaoguangrong eric <xiaoguangrong.eric@gmail.com>,
pbonzini@redhat.com, kilobyte@angband.pl,
yuval shaia <yuval.shaia@oracle.com>,
jstaron@google.com
Subject: Re: [PATCH v9 2/7] virtio-pmem: Add virtio pmem driver
Date: Thu, 16 May 2019 03:49:05 -0400 (EDT) [thread overview]
Message-ID: <1441757090.29182398.1557992945173.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <9f6b1d8e-ef90-7d8b-56da-61a426953ba3@redhat.com>
>
> > + vpmem->vdev = vdev;
> > + vdev->priv = vpmem;
> > + err = init_vq(vpmem);
> > + if (err) {
> > + dev_err(&vdev->dev, "failed to initialize virtio pmem vq's\n");
> > + goto out_err;
> > + }
> > +
> > + virtio_cread(vpmem->vdev, struct virtio_pmem_config,
> > + start, &vpmem->start);
> > + virtio_cread(vpmem->vdev, struct virtio_pmem_config,
> > + size, &vpmem->size);
> > +
> > + res.start = vpmem->start;
> > + res.end = vpmem->start + vpmem->size-1;
>
> nit: " - 1;"
Sure.
>
> > + vpmem->nd_desc.provider_name = "virtio-pmem";
> > + vpmem->nd_desc.module = THIS_MODULE;
> > +
> > + vpmem->nvdimm_bus = nvdimm_bus_register(&vdev->dev,
> > + &vpmem->nd_desc);
> > + if (!vpmem->nvdimm_bus) {
> > + dev_err(&vdev->dev, "failed to register device with nvdimm_bus\n");
> > + err = -ENXIO;
> > + goto out_vq;
> > + }
> > +
> > + dev_set_drvdata(&vdev->dev, vpmem->nvdimm_bus);
> > +
> > + ndr_desc.res = &res;
> > + ndr_desc.numa_node = nid;
> > + ndr_desc.flush = async_pmem_flush;
> > + set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
> > + set_bit(ND_REGION_ASYNC, &ndr_desc.flags);
> > + nd_region = nvdimm_pmem_region_create(vpmem->nvdimm_bus, &ndr_desc);
> > + if (!nd_region) {
> > + dev_err(&vdev->dev, "failed to create nvdimm region\n");
> > + err = -ENXIO;
> > + goto out_nd;
> > + }
> > + nd_region->provider_data = dev_to_virtio(nd_region->dev.parent->parent);
> > + return 0;
> > +out_nd:
> > + nvdimm_bus_unregister(vpmem->nvdimm_bus);
> > +out_vq:
> > + vdev->config->del_vqs(vdev);
> > +out_err:
> > + return err;
> > +}
> > +
> > +static void virtio_pmem_remove(struct virtio_device *vdev)
> > +{
> > + struct nvdimm_bus *nvdimm_bus = dev_get_drvdata(&vdev->dev);
> > +
> > + nvdimm_bus_unregister(nvdimm_bus);
> > + vdev->config->del_vqs(vdev);
> > + vdev->config->reset(vdev);
> > +}
> > +
> > +static struct virtio_driver virtio_pmem_driver = {
> > + .driver.name = KBUILD_MODNAME,
> > + .driver.owner = THIS_MODULE,
> > + .id_table = id_table,
> > + .probe = virtio_pmem_probe,
> > + .remove = virtio_pmem_remove,
> > +};
> > +
> > +module_virtio_driver(virtio_pmem_driver);
> > +MODULE_DEVICE_TABLE(virtio, id_table);
> > +MODULE_DESCRIPTION("Virtio pmem driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/nvdimm/virtio_pmem.h b/drivers/nvdimm/virtio_pmem.h
> > new file mode 100644
> > index 000000000000..ab1da877575d
> > --- /dev/null
> > +++ b/drivers/nvdimm/virtio_pmem.h
> > @@ -0,0 +1,60 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * virtio_pmem.h: virtio pmem Driver
> > + *
> > + * Discovers persistent memory range information
> > + * from host and provides a virtio based flushing
> > + * interface.
> > + **/
> > +
> > +#ifndef _LINUX_VIRTIO_PMEM_H
> > +#define _LINUX_VIRTIO_PMEM_H
> > +
> > +#include <linux/virtio_ids.h>
> > +#include <linux/module.h>
> > +#include <linux/virtio_config.h>
> > +#include <uapi/linux/virtio_pmem.h>
> > +#include <linux/libnvdimm.h>
> > +#include <linux/spinlock.h>
> > +
> > +struct virtio_pmem_request {
> > + /* Host return status corresponding to flush request */
> > + int ret;
> > +
> > + /* command name*/
> > + char name[16];
>
> So ... why are we sending string commands and expect native-endianess
> integers and don't define a proper request/response structure + request
> types in include/uapi/linux/virtio_pmem.h like
>
> struct virtio_pmem_resp {
> __virtio32 ret;
> }
>
> #define VIRTIO_PMEM_REQ_TYPE_FLUSH 1
> struct virtio_pmem_req {
> __virtio16 type;
> }
>
> ... and this way we also define a proper endianess format for exchange
> and keep it extensible
Done the suggested change.
Thank you,
Pankaj
>
> @MST, what's your take on this?
>
>
> --
>
> Thanks,
>
> David / dhildenb
>
next prev parent reply other threads:[~2019-05-16 7:49 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 14:54 [PATCH v9 0/7] virtio pmem driver Pankaj Gupta
2019-05-14 14:54 ` [PATCH v9 1/7] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-05-15 21:07 ` Dan Williams
2019-05-16 6:28 ` Pankaj Gupta
2019-05-14 14:54 ` [PATCH v9 2/7] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-05-14 15:09 ` Randy Dunlap
2019-05-14 15:25 ` [Qemu-devel] " Pankaj Gupta
2019-05-15 20:46 ` Dan Williams
2019-05-15 20:46 ` David Hildenbrand
2019-05-15 20:52 ` David Hildenbrand
2019-05-16 7:54 ` Pankaj Gupta
2019-05-16 7:49 ` Pankaj Gupta [this message]
2019-05-16 13:59 ` Michael S. Tsirkin
2019-05-17 5:31 ` [Qemu-devel] " Pankaj Gupta
2019-05-17 0:12 ` Jakub Staroń
2019-05-17 5:35 ` [Qemu-devel] " Pankaj Gupta
2019-05-18 1:10 ` Jakub Staroń
2019-05-20 3:46 ` Pankaj Gupta
2019-05-20 3:47 ` Pankaj Gupta
2019-05-14 14:54 ` [PATCH v9 3/7] libnvdimm: add dax_dev sync flag Pankaj Gupta
2019-05-14 14:54 ` [PATCH v9 4/7] dm: enable synchronous dax Pankaj Gupta
2019-05-15 20:48 ` Dan Williams
2019-05-14 14:54 ` [PATCH v9 5/7] dax: check synchronous mapping is supported Pankaj Gupta
2019-05-14 14:54 ` [PATCH v9 6/7] ext4: disable map_sync for async flush Pankaj Gupta
2019-05-14 14:54 ` [PATCH v9 7/7] xfs: " Pankaj Gupta
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