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Date: Wed, 20 Mar 2013 15:33:30 +0800
From: Asias He <asias@...hat.com>
To: Wanlong Gao <gaowanlong@...fujitsu.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-scsi@...r.kernel.org,
virtualization@...ts.linux-foundation.org, rusty@...tcorp.com.au,
mst@...hat.com, JBottomley@...allels.com, venkateshs@...gle.com,
pbonzini@...hat.com,
James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH V6 1/5] virtio-scsi: redo allocation of target data
On Wed, Mar 20, 2013 at 03:01:20PM +0800, Wanlong Gao wrote:
> virtio_scsi_target_state is now empty. We will find new uses for it in
> the next few patches, so this patch does not drop it completely.
>
> And as James suggested, we use entries target_alloc and target_destroy
> in the host template to allocate and destroy the virtio_scsi_target_state
> of each target, attach this struct to scsi_target->hostdata. Now
> we can get at it from the sdev with scsi_target(sdev)->hostdata.
> No messing around with fixed size arrays and bulk memory allocation
> and no need to pass in the maximum target size as a parameter because
> everything should now happen dynamically.
>
> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> Cc: linux-scsi@...r.kernel.org
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Wanlong Gao <gaowanlong@...fujitsu.com>
Reviewed-by: Asias He <asias@...hat.com>
> ---
> drivers/scsi/virtio_scsi.c | 71 ++++++++++++++++------------------------------
> 1 file changed, 25 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index b53ba9e..ffa03e8 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -75,8 +75,6 @@ struct virtio_scsi {
>
> /* Get some buffers ready for event vq */
> struct virtio_scsi_event_node event_list[VIRTIO_SCSI_EVENT_LEN];
> -
> - struct virtio_scsi_target_state *tgt[];
> };
>
> static struct kmem_cache *virtscsi_cmd_cache;
> @@ -530,6 +528,25 @@ static int virtscsi_abort(struct scsi_cmnd *sc)
> return virtscsi_tmf(vscsi, cmd);
> }
>
> +static int virtscsi_target_alloc(struct scsi_target *starget)
> +{
> + struct virtio_scsi_target_state *tgt =
> + kmalloc(sizeof(*tgt), GFP_KERNEL);
> + if (!tgt)
> + return -ENOMEM;
> +
> + spin_lock_init(&tgt->tgt_lock);
> +
> + starget->hostdata = tgt;
> + return 0;
> +}
> +
> +static void virtscsi_target_destroy(struct scsi_target *starget)
> +{
> + struct virtio_scsi_target_state *tgt = starget->hostdata;
> + kfree(tgt);
> +}
> +
> static struct scsi_host_template virtscsi_host_template = {
> .module = THIS_MODULE,
> .name = "Virtio SCSI HBA",
> @@ -542,6 +559,8 @@ static struct scsi_host_template virtscsi_host_template = {
> .can_queue = 1024,
> .dma_boundary = UINT_MAX,
> .use_clustering = ENABLE_CLUSTERING,
> + .target_alloc = virtscsi_target_alloc,
> + .target_destroy = virtscsi_target_destroy,
> };
>
> #define virtscsi_config_get(vdev, fld) \
> @@ -568,20 +587,6 @@ static void virtscsi_init_vq(struct virtio_scsi_vq *virtscsi_vq,
> virtscsi_vq->vq = vq;
> }
>
> -static struct virtio_scsi_target_state *virtscsi_alloc_tgt(
> - struct virtio_device *vdev)
> -{
> - struct virtio_scsi_target_state *tgt;
> - gfp_t gfp_mask = GFP_KERNEL;
> -
> - tgt = kmalloc(sizeof(*tgt), gfp_mask);
> - if (!tgt)
> - return NULL;
> -
> - spin_lock_init(&tgt->tgt_lock);
> - return tgt;
> -}
> -
> static void virtscsi_scan(struct virtio_device *vdev)
> {
> struct Scsi_Host *shost = (struct Scsi_Host *)vdev->priv;
> @@ -591,28 +596,17 @@ static void virtscsi_scan(struct virtio_device *vdev)
>
> static void virtscsi_remove_vqs(struct virtio_device *vdev)
> {
> - struct Scsi_Host *sh = virtio_scsi_host(vdev);
> - struct virtio_scsi *vscsi = shost_priv(sh);
> - u32 i, num_targets;
> -
> /* Stop all the virtqueues. */
> vdev->config->reset(vdev);
>
> - num_targets = sh->max_id;
> - for (i = 0; i < num_targets; i++) {
> - kfree(vscsi->tgt[i]);
> - vscsi->tgt[i] = NULL;
> - }
> -
> vdev->config->del_vqs(vdev);
> }
>
> static int virtscsi_init(struct virtio_device *vdev,
> - struct virtio_scsi *vscsi, int num_targets)
> + struct virtio_scsi *vscsi)
> {
> int err;
> struct virtqueue *vqs[3];
> - u32 i;
>
> vq_callback_t *callbacks[] = {
> virtscsi_ctrl_done,
> @@ -640,18 +634,6 @@ static int virtscsi_init(struct virtio_device *vdev,
> if (virtio_has_feature(vdev, VIRTIO_SCSI_F_HOTPLUG))
> virtscsi_kick_event_all(vscsi);
>
> - for (i = 0; i < num_targets; i++) {
> - vscsi->tgt[i] = virtscsi_alloc_tgt(vdev);
> - if (!vscsi->tgt[i]) {
> - err = -ENOMEM;
> - goto out;
> - }
> - }
> - err = 0;
> -
> -out:
> - if (err)
> - virtscsi_remove_vqs(vdev);
> return err;
> }
>
> @@ -663,12 +645,9 @@ static int virtscsi_probe(struct virtio_device *vdev)
> u32 sg_elems, num_targets;
> u32 cmd_per_lun;
>
> - /* Allocate memory and link the structs together. */
> num_targets = virtscsi_config_get(vdev, max_target) + 1;
> - shost = scsi_host_alloc(&virtscsi_host_template,
> - sizeof(*vscsi)
> - + num_targets * sizeof(struct virtio_scsi_target_state));
>
> + shost = scsi_host_alloc(&virtscsi_host_template, sizeof(*vscsi));
> if (!shost)
> return -ENOMEM;
>
> @@ -678,7 +657,7 @@ static int virtscsi_probe(struct virtio_device *vdev)
> vscsi->vdev = vdev;
> vdev->priv = shost;
>
> - err = virtscsi_init(vdev, vscsi, num_targets);
> + err = virtscsi_init(vdev, vscsi);
> if (err)
> goto virtscsi_init_failed;
>
> @@ -735,7 +714,7 @@ static int virtscsi_restore(struct virtio_device *vdev)
> struct Scsi_Host *sh = virtio_scsi_host(vdev);
> struct virtio_scsi *vscsi = shost_priv(sh);
>
> - return virtscsi_init(vdev, vscsi, sh->max_id);
> + return virtscsi_init(vdev, vscsi);
> }
> #endif
>
> --
> 1.8.2.rc2
>
--
Asias
--
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