On Wed, 2006-08-30 at 17:30 +0800, Ed Lin wrote:
> +stex_slave_alloc(struct scsi_device *sdev)
> +{
> + struct st_hba *hba = (struct st_hba *) sdev->host->hostdata;
> + unsigned long flags;
> +
> + /*
> + * this should be done in slave_configure routine. but we need
> + * tagging ever since the first command. we can't wait...
> + */
> + spin_lock_irqsave(hba->host->host_lock, flags);
> + if (hba->devnum++ == 0) {
> + if (blk_queue_init_tags(sdev->request_queue,
> + hba->host->can_queue, NULL) == 0) {
> + hba->ref = 1;
> + hba->shared_queue = sdev->request_queue;
> + }
> + } else if (hba->ref) {
> + blk_queue_init_tags(sdev->request_queue,
> + hba->host->can_queue,
> hba->shared_queue->queue_tags);
> + hba->ref++;
> + }
> +
> + if (hba->ref) {
> + sdev->tagged_supported = 1;
> + scsi_set_tag_type(sdev, MSG_SIMPLE_TAG);
> + scsi_adjust_queue_depth(sdev,
> + scsi_get_tag_type(sdev),
> hba->host->can_queue);
> + } else
> + sdev->tagged_supported = 0;
> + spin_unlock_irqrestore(hba->host->host_lock, flags);
OK, this is indicating an inherent problem in using the shared tag maps.
I talked a bit with Jens and we think there's a way to eliminate most of
this and collapse it down to a simple SCSI helper. I'll post the two
patches separately, but basically when its done your slave alloc should
become a simple scsi_activate_tcq().
James
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