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SubjectRe: [PATCH v29 4/4] scsi: ufs: Add HPB 2.0 support
On 2021-03-15 09:31, Daejun Park wrote:
> This patch supports the HPB 2.0.
>
> The HPB 2.0 supports read of varying sizes from 4KB to 512KB.
> In the case of Read (<= 32KB) is supported as single HPB read.
> In the case of Read (36KB ~ 512KB) is supported by as a combination of
> write buffer command and HPB read command to deliver more PPN.
> The write buffer commands may not be issued immediately due to busy
> tags.
> To use HPB read more aggressively, the driver can requeue the write
> buffer
> command. The requeue threshold is implemented as timeout and can be
> modified with requeue_timeout_ms entry in sysfs.
>
> Signed-off-by: Daejun Park <daejun7.park@samsung.com>
> ---
> +static int ufshpb_issue_pre_req(struct ufshpb_lu *hpb, struct
> scsi_cmnd *cmd,
> + int *read_id)
> +{
> + struct ufshpb_req *pre_req;
> + struct request *req = NULL;
> + struct bio *bio = NULL;
> + unsigned long flags;
> + int _read_id;
> + int ret = 0;
> +
> + req = blk_get_request(cmd->device->request_queue,

To keep symmetry with ufshpb_get_req(), can we use
hpb->sdev_ufs_lu->request_queue?

Thanks,
Can Guo.

> + REQ_OP_SCSI_OUT | REQ_SYNC, BLK_MQ_REQ_NOWAIT);
> + if (IS_ERR(req))
> + return -EAGAIN;
> +
> + bio = bio_alloc(GFP_ATOMIC, 1);
> + if (!bio) {
> + blk_put_request(req);
> + return -EAGAIN;
> + }
> +
> + spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> + pre_req = ufshpb_get_pre_req(hpb);
> + if (!pre_req) {
> + ret = -EAGAIN;
> + goto unlock_out;
> + }
> + _read_id = ufshpb_get_read_id(hpb);
> + spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> +
> + pre_req->req = req;
> + pre_req->bio = bio;
> +
> + ret = ufshpb_execute_pre_req(hpb, cmd, pre_req, _read_id);
> + if (ret)
> + goto free_pre_req;
> +
> + *read_id = _read_id;
> +
> + return ret;
> +free_pre_req:
> + spin_lock_irqsave(&hpb->rgn_state_lock, flags);
> + ufshpb_put_pre_req(hpb, pre_req);
> +unlock_out:
> + spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
> + bio_put(bio);
> + blk_put_request(req);
> + return ret;
> +}
> +

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