linux-kernel - RE: [PATCH] scsi: ufs: introduce dev_cmd

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Date:   Wed, 27 Jul 2022 05:16:22 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Gyunghoon Kwon <goodjob.kwon@...sung.com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "alim.akhtar@...sung.com" <alim.akhtar@...sung.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] scsi: ufs: introduce dev_cmd_notify callback

> 
> Some UFS host controller may need to synchronize dev command among UFS
> host controllers.
> 
> Signed-off-by: Gyunghoon Kwon <goodjob.kwon@...sung.com>
You need to include at least one implementation of this vop,
Otherwise, its just a piece of dead code.

Thanks,
Avri

> ---
>  drivers/ufs/core/ufshcd.c |  2 ++
>  include/ufs/ufshcd.h      | 10 ++++++++++
>  2 files changed, 12 insertions(+)
> 
> diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index
> c7b337480e3e..fb642c5e73a3 100644
> --- a/drivers/ufs/core/ufshcd.c
> +++ b/drivers/ufs/core/ufshcd.c
> @@ -3021,8 +3021,10 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba
> *hba,
> 
>         ufshcd_add_query_upiu_trace(hba, UFS_QUERY_SEND, lrbp-
> >ucd_req_ptr);
> 
> +       ufshcd_vops_dev_cmd_notify(hba, PRE_CHANGE);
>         ufshcd_send_command(hba, tag);
>         err = ufshcd_wait_for_dev_cmd(hba, lrbp, timeout);
> +       ufshcd_vops_dev_cmd_notify(hba, POST_CHANGE);
>         ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR :
> UFS_QUERY_COMP,
>                                     (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
> 
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index
> a92271421718..376babf71432 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -293,6 +293,7 @@ struct ufs_pwr_mode_info {
>   * @config_scaling_param: called to configure clock scaling parameters
>   * @program_key: program or evict an inline encryption key
>   * @event_notify: called to notify important events
> + * @dev_cmd_notify: called to notify device management request is
> + issued
>   */
>  struct ufs_hba_variant_ops {
>         const char *name;
> @@ -331,6 +332,8 @@ struct ufs_hba_variant_ops {
>                                const union ufs_crypto_cfg_entry *cfg, int slot);
>         void    (*event_notify)(struct ufs_hba *hba,
>                                 enum ufs_event_type evt, void *data);
> +       void    (*dev_cmd_notify)(struct ufs_hba *hba,
> +                                 enum ufs_notify_change_status);
>  };
> 
>  /* clock gating state  */
> @@ -1217,6 +1220,13 @@ static inline int
> ufshcd_vops_phy_initialization(struct ufs_hba *hba)
>         return 0;
>  }
> 
> +static inline void ufshcd_vops_dev_cmd_notify(struct ufs_hba *hba,
> +                                       enum ufs_notify_change_status
> +status) {
> +       if (hba->vops && hba->vops->dev_cmd_notify)
> +               hba->vops->dev_cmd_notify(hba, status); }
> +
>  extern struct ufs_pm_lvl_states ufs_pm_lvl_states[];
> 
>  int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
> --
> 2.37.1