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authorWanlong Gao <gaowanlong@cn.fujitsu.com>2013-04-08 23:01:16 +0930
committerRusty Russell <rusty@rustcorp.com.au>2013-04-08 23:06:47 +0930
commit5c370194df9a97248ca69e05bfbd2d21b4886fe5 (patch)
tree068f626733a03d5100f6c32a7a8bf44bd23b109a
parent3826835ab8bb7eac47f14f279df2bd58ec2bb279 (diff)
downloadblackbird-op-linux-5c370194df9a97248ca69e05bfbd2d21b4886fe5.tar.gz
blackbird-op-linux-5c370194df9a97248ca69e05bfbd2d21b4886fe5.zip
virtio-scsi: redo allocation of target data
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@HansenPartnership.com> Cc: linux-scsi@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Reviewed-by: Asias He <asias@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
-rw-r--r--drivers/scsi/virtio_scsi.c71
1 files changed, 25 insertions, 46 deletions
diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index b53ba9e18f47..ffa03e8cb19c 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
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