[PATCH rfc 25/30] nvme: move control plane handling to nvme core

[Christoph Hellwig]

> +static void nvme_free_io_queues(struct nvme_ctrl *ctrl)
> +{
> +	int i;
> +
> +	for (i = 1; i < ctrl->queue_count; i++)
> +		ctrl->ops->free_hw_queue(ctrl, i);
> +}
> +
> +void nvme_stop_io_queues(struct nvme_ctrl *ctrl)
> +{
> +	int i;
> +
> +	for (i = 1; i < ctrl->queue_count; i++)
> +		ctrl->ops->stop_hw_queue(ctrl, i);
> +}
> +EXPORT_SYMBOL_GPL(nvme_stop_io_queues);

At leasr for PCIe this is going to work very differently, so I'm not
sure this part make so much sense in the core.  Maybe in Fabrics?
Or at least make the callouts operate on all I/O queues, which would
suite PCIe a lot more.

> +	error = ctrl->ops->start_hw_queue(ctrl, 0);
> +	if (error)
> +		goto out_cleanup_connect_queue;
> +
> +	error = ctrl->ops->reg_read64(ctrl, NVME_REG_CAP, &ctrl->cap);
> +	if (error) {
> +		dev_err(ctrl->device,
> +			"prop_get NVME_REG_CAP failed\n");
> +		goto out_cleanup_connect_queue;
> +	}
> +
> +	ctrl->sqsize = min_t(int, NVME_CAP_MQES(ctrl->cap), ctrl->sqsize);
> +
> +	error = nvme_enable_ctrl(ctrl, ctrl->cap);
> +	if (error)
> +		goto out_cleanup_connect_queue;

I'm not sure this ordering is going to work for PCIe..