RE: [PATCH 2/2] ufs: don't use the fair tag sharings

[Avri Altman]

> The tags allocation is limited by the fair sharing algorithm. It hurts
> the performance for UFS devices, because the queue depth of general I/O
> is reduced by half once the UFS send a control command.
Ack.

However, I think the decision of that should be of the platform owner,
And not in the core driver.

Thanks,
Avri

> 
> Signed-off-by: Ed Tsai <ed.tsai@xxxxxxxxxxxx>
> ---
>  drivers/ufs/core/ufshcd.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> index 17d7bb875fee..e96a50265285 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -5149,6 +5149,9 @@ static int ufshcd_slave_configure(struct scsi_device
> *sdev)
>         blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
>         if (hba->quirks & UFSHCD_QUIRK_4KB_DMA_ALIGNMENT)
>                 blk_queue_update_dma_alignment(q, 4096 - 1);
> +
> +       blk_queue_flag_clear(QUEUE_FLAG_FAIR_TAG_SHARING, q);
> +
>         /*
>          * Block runtime-pm until all consumers are added.
>          * Refer ufshcd_setup_links().
> --
> 2.18.0