linux-kernel - RE: [PATCH v2 5/6] ufs: core: Pass EHS length into ufshcd_prepare_req_desc

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Date:   Tue, 22 Nov 2022 09:41:56 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Bean Huo <beanhuo@...pp.de>,
        "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "tomas.winkler@...el.com" <tomas.winkler@...el.com>,
        "daejun7.park@...sung.com" <daejun7.park@...sung.com>,
        "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
        "quic_nguyenb@...cinc.com" <quic_nguyenb@...cinc.com>,
        "quic_xiaosenh@...cinc.com" <quic_xiaosenh@...cinc.com>,
        "quic_richardp@...cinc.com" <quic_richardp@...cinc.com>,
        "quic_asutoshd@...cinc.com" <quic_asutoshd@...cinc.com>,
        "hare@...e.de" <hare@...e.de>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 5/6] ufs: core: Pass EHS length into
 ufshcd_prepare_req_desc_hdr()

 
> From: Bean Huo <beanhuo@...ron.com>
> 
> We need to fill in the total EHS length in UTP Transfer Request Descriptor,
> add this functionality to ufshcd_prepare_req_desc_hdr().
> 
> Signed-off-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Avri Altman <avri.altman@....com>

> ---
>  drivers/ufs/core/ufshcd.c | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index
> 311172578fd8..2936e1e583c3 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -2508,14 +2508,15 @@ static void ufshcd_disable_intr(struct ufs_hba
> *hba, u32 intrs)  }
> 
>  /**
> - * ufshcd_prepare_req_desc_hdr() - Fills the requests header
> + * ufshcd_prepare_req_desc_hdr - Fill UTP Transfer request descriptor
> + header according to request
>   * descriptor according to request
>   * @lrbp: pointer to local reference block
>   * @upiu_flags: flags required in the header
>   * @cmd_dir: requests data direction
> + * @ehs_length: Total EHS Length (in 32‐bytes units of all Extra Header
> + Segments)
>   */
> -static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp,
> -                       u8 *upiu_flags, enum dma_data_direction cmd_dir)
> +static void ufshcd_prepare_req_desc_hdr(struct ufshcd_lrb *lrbp, u8
> *upiu_flags,
> +                                       enum dma_data_direction cmd_dir,
> +int ehs_length)
>  {
>         struct utp_transfer_req_desc *req_desc = lrbp->utr_descriptor_ptr;
>         u32 data_direction;
> @@ -2534,8 +2535,8 @@ static void ufshcd_prepare_req_desc_hdr(struct
> ufshcd_lrb *lrbp,
>                 *upiu_flags = UPIU_CMD_FLAGS_NONE;
>         }
> 
> -       dword_0 = data_direction | (lrbp->command_type
> -                               << UPIU_COMMAND_TYPE_OFFSET);
> +       dword_0 = data_direction | (lrbp->command_type <<
> UPIU_COMMAND_TYPE_OFFSET) |
> +               ehs_length << 8;
>         if (lrbp->intr_cmd)
>                 dword_0 |= UTP_REQ_DESC_INT_CMD;
> 
> @@ -2590,8 +2591,7 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct
> ufshcd_lrb *lrbp, u8 upiu_flags)  }
> 
>  /**
> - * ufshcd_prepare_utp_query_req_upiu() - fills the utp_transfer_req_desc,
> - * for query requsts
> + * ufshcd_prepare_utp_query_req_upiu() - fill the utp_transfer_req_desc
> + for query request
>   * @hba: UFS hba
>   * @lrbp: local reference block pointer
>   * @upiu_flags: flags
> @@ -2662,7 +2662,7 @@ static int ufshcd_compose_devman_upiu(struct
> ufs_hba *hba,
>         else
>                 lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
> 
> -       ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
> +       ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE, 0);
>         if (hba->dev_cmd.type == DEV_CMD_TYPE_QUERY)
>                 ufshcd_prepare_utp_query_req_upiu(hba, lrbp, upiu_flags);
>         else if (hba->dev_cmd.type == DEV_CMD_TYPE_NOP) @@ -2690,8
> +2690,7 @@ static int ufshcd_comp_scsi_upiu(struct ufs_hba *hba, struct
> ufshcd_lrb *lrbp)
>                 lrbp->command_type = UTP_CMD_TYPE_UFS_STORAGE;
> 
>         if (likely(lrbp->cmd)) {
> -               ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
> -                                               lrbp->cmd->sc_data_direction);
> +               ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags,
> + lrbp->cmd->sc_data_direction, 0);
>                 ufshcd_prepare_utp_scsi_cmd_upiu(lrbp, upiu_flags);
>         } else {
>                 ret = -EINVAL;
> @@ -6862,7 +6861,7 @@ static int ufshcd_issue_devman_upiu_cmd(struct
> ufs_hba *hba,
>         /* update the task tag in the request upiu */
>         req_upiu->header.dword_0 |= cpu_to_be32(tag);
> 
> -       ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE);
> +       ufshcd_prepare_req_desc_hdr(lrbp, &upiu_flags, DMA_NONE, 0);
> 
>         /* just copy the upiu request as it is */
>         memcpy(lrbp->ucd_req_ptr, req_upiu, sizeof(*lrbp->ucd_req_ptr));
> --
> 2.25.1