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From: "Jakub Staroń" <jstaron@google.com>
To: Pankaj Gupta <pagupta@redhat.com>,
	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
Cc: dan.j.williams@intel.com, zwisler@kernel.org,
	vishal.l.verma@intel.com, dave.jiang@intel.com, mst@redhat.com,
	jasowang@redhat.com, willy@infradead.org, rjw@rjwysocki.net,
	hch@infradead.org, lenb@kernel.org, jack@suse.cz, tytso@mit.edu,
	adilger.kernel@dilger.ca, 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@redhat.com,
	david@fromorbit.com, cohuck@redhat.com,
	xiaoguangrong.eric@gmail.com, pbonzini@redhat.com,
	kilobyte@angband.pl, yuval.shaia@oracle.com, smbarber@google.com
Subject: Re: [PATCH v9 2/7] virtio-pmem: Add virtio pmem driver
Date: Thu, 16 May 2019 17:12:36 -0700
Message-ID: <c06514fd-8675-ba74-4b7b-ff0eb4a91605@google.com> (raw)
In-Reply-To: <20190514145422.16923-3-pagupta@redhat.com>

On 5/14/19 7:54 AM, Pankaj Gupta wrote:
> +		if (!list_empty(&vpmem->req_list)) {
> +			req_buf = list_first_entry(&vpmem->req_list,
> +					struct virtio_pmem_request, list);
> +			req_buf->wq_buf_avail = true;
> +			wake_up(&req_buf->wq_buf);
> +			list_del(&req_buf->list);
Yes, this change is the right one, thank you!

> +	 /*
> +	  * If virtqueue_add_sgs returns -ENOSPC then req_vq virtual
> +	  * queue does not have free descriptor. We add the request
> +	  * to req_list and wait for host_ack to wake us up when free
> +	  * slots are available.
> +	  */
> +	while ((err = virtqueue_add_sgs(vpmem->req_vq, sgs, 1, 1, req,
> +					GFP_ATOMIC)) == -ENOSPC) {
> +
> +		dev_err(&vdev->dev, "failed to send command to virtio pmem" \
> +			"device, no free slots in the virtqueue\n");
> +		req->wq_buf_avail = false;
> +		list_add_tail(&req->list, &vpmem->req_list);
> +		spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> +
> +		/* A host response results in "host_ack" getting called */
> +		wait_event(req->wq_buf, req->wq_buf_avail);
> +		spin_lock_irqsave(&vpmem->pmem_lock, flags);
> +	}
> +	err1 = virtqueue_kick(vpmem->req_vq);
> +	spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> +
> +	/*
> +	 * virtqueue_add_sgs failed with error different than -ENOSPC, we can't
> +	 * do anything about that.
> +	 */
> +	if (err || !err1) {
> +		dev_info(&vdev->dev, "failed to send command to virtio pmem device\n");
> +		err = -EIO;
> +	} else {
> +		/* A host repsonse results in "host_ack" getting called */
> +		wait_event(req->host_acked, req->done);
> +		err = req->ret;
> +I confirm that the failures I was facing with the `-ENOSPC` error path are not present in v9.

Best,
Jakub Staron

  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-14 14:54 [PATCH v9 0/7] " 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
2019-05-16 13:59     ` Michael S. Tsirkin
2019-05-17  5:31       ` [Qemu-devel] " Pankaj Gupta
2019-05-17  0:12   ` Jakub Staroń [this message]
2019-05-17  5:35     ` 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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