From: Pankaj Gupta <pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Stefan Hajnoczi <stefanha-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: kwolf-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
jack-AlSwsSmVLrQ@public.gmane.org,
xiaoguangrong eric
<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
<ross.zwisler-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org,
hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
imammedo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
niteshnarayanlal-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org,
lcapitulino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
nilal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
eblake-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
Subject: Re: [RFC v3 2/2] virtio-pmem: Add virtio pmem driver
Date: Wed, 18 Jul 2018 03:05:09 -0400 (EDT) [thread overview]
Message-ID: <2137768776.51859350.1531897509492.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <20180717131156.GA13498-lxVrvc10SDRcolVlb+j0YCZi+YwRKgec@public.gmane.org>
Hi Stefan,
> > + /* The request submission function */
> > +static int virtio_pmem_flush(struct device *dev)
> > +{
> > + int err;
> > + unsigned long flags;
> > + struct scatterlist *sgs[2], sg, ret;
> > + struct virtio_device *vdev = dev_to_virtio(dev->parent->parent);
> > + struct virtio_pmem *vpmem = vdev->priv;
> > + struct virtio_pmem_request *req = kmalloc(sizeof(*req), GFP_KERNEL);
> > +
> > + req->done = false;
> > + init_waitqueue_head(&req->acked);
> > + spin_lock_irqsave(&vpmem->pmem_lock, flags);
> > +
> > + sg_init_one(&sg, req, sizeof(req));
>
> What are you trying to do here?
>
> sizeof(req) == sizeof(struct virtio_pmem_request *) == sizeof(void *)
>
> Did you mean sizeof(*req)?
yes, I meant: sizeof(struct virtio_pmem_request)
Thanks for catching this.
>
> But why map struct virtio_pmem_request to the device? struct
> virtio_pmem_request is the driver-internal request state and is not part
> of the hardware interface.
o.k. I will separate out request from 'virtio_pmem_request' struct
and use that.
>
> > + sgs[0] = &sg;
> > + sg_init_one(&ret, &req->ret, sizeof(req->ret));
> > + sgs[1] = &ret;
> > + err = virtqueue_add_sgs(vpmem->req_vq, sgs, 1, 1, req, GFP_ATOMIC);
> > + if (err) {
> > + dev_err(&vdev->dev, "failed to send command to virtio pmem device\n");
>
> This can happen if the virtqueue is full. Printing a message and
> failing the flush isn't appropriate. This thread needs to wait until
> virtqueue space becomes available.
o.k. I will implement this.
>
> > + spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> > + return -ENOSPC;
>
> req is leaked.
will free req.
>
> > + virtio_device_ready(vdev);
>
> This call isn't needed. Driver use it when they wish to submit buffers
> on virtqueues before ->probe() returns.
o.k. I will remove it.
>
> > diff --git a/include/linux/virtio_pmem.h b/include/linux/virtio_pmem.h
> > new file mode 100644
> > index 0000000..0f83d9c
> > --- /dev/null
> > +++ b/include/linux/virtio_pmem.h
>
> include/ is for declarations (e.g. kernel APIs) needed by other
> compilation units. The contents of this header are internal to the
> virtio_pmem driver implementation and can therefore be in virtio_pmem.c.
> include/linux/virtio_pmem.h isn't necessary since nothing besides
> virtio_pmem.c will need to include it.
Agree. Will move declarations from virtio_pmem.h to virtio_pmem.c
Thanks,
Pankaj
next prev parent reply other threads:[~2018-07-18 7:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-13 7:52 [RFC v3 0/2] kvm "fake DAX" device flushing Pankaj Gupta
2018-07-13 7:52 ` [RFC v3 1/2] libnvdimm: Add flush callback for virtio pmem Pankaj Gupta
2018-07-13 20:35 ` Luiz Capitulino
2018-07-16 8:13 ` Pankaj Gupta
[not found] ` <20180713075232.9575-1-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-13 7:52 ` [RFC v3 2/2] virtio-pmem: Add virtio pmem driver Pankaj Gupta
[not found] ` <20180713075232.9575-3-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-13 20:38 ` Luiz Capitulino
2018-07-16 11:46 ` [Qemu-devel] " Pankaj Gupta
[not found] ` <633297685.51039804.1531741590092.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-16 14:03 ` Luiz Capitulino
2018-07-16 15:11 ` Pankaj Gupta
2018-07-17 13:11 ` Stefan Hajnoczi
[not found] ` <20180717131156.GA13498-lxVrvc10SDRcolVlb+j0YCZi+YwRKgec@public.gmane.org>
2018-07-18 7:05 ` Pankaj Gupta [this message]
2018-08-28 12:13 ` [RFC v3 0/2] kvm "fake DAX" device flushing David Hildenbrand
[not found] ` <1328e543-0276-8f33-1744-8baa053023c4-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-08-28 12:39 ` [Qemu-devel] " Pankaj Gupta
2018-07-13 7:52 ` [RFC v3] qemu: Add virtio pmem device Pankaj Gupta
[not found] ` <20180713075232.9575-4-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-18 12:55 ` Luiz Capitulino
2018-07-19 5:48 ` [Qemu-devel] " Pankaj Gupta
2018-07-19 12:16 ` Stefan Hajnoczi
[not found] ` <20180719121635.GA28107-lxVrvc10SDRcolVlb+j0YCZi+YwRKgec@public.gmane.org>
2018-07-19 12:48 ` Luiz Capitulino
2018-07-19 12:57 ` Luiz Capitulino
2018-07-20 13:04 ` Pankaj Gupta
2018-07-19 13:58 ` David Hildenbrand
[not found] ` <b6ef19f3-7f16-5427-bfed-f352a76e48b7-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-19 15:48 ` Luiz Capitulino
2018-07-20 13:02 ` Pankaj Gupta
[not found] ` <367397176.52317488.1531979293251.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-19 12:39 ` Luiz Capitulino
2018-07-24 16:13 ` Eric Blake
[not found] ` <783786ae-2e85-2376-448c-1e362c3d4d48-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-25 5:01 ` [Qemu-devel] " Pankaj Gupta
[not found] ` <399916154.53931292.1532494899706.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-25 12:19 ` Eric Blake
[not found] ` <d3fe397a-024d-faf7-8854-bb8e9ea17f53-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-07-25 12:47 ` Pankaj Gupta
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