linux-kernel - RE: [RFC PATCH v3 1/1] scsi: ufs: Enable power management for wlun

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Message-ID: <DM6PR04MB65758E0EBF4171FD6E1CF0CFFC8A9@DM6PR04MB6575.namprd04.prod.outlook.com>
Date:   Sat, 13 Feb 2021 21:37:29 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Asutosh Das <asutoshd@...eaurora.org>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "stern@...land.harvard.edu" <stern@...land.harvard.edu>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Kiwoong Kim <kwmad.kim@...sung.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Satya Tangirala <satyat@...gle.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH v3 1/1] scsi: ufs: Enable power management for wlun

> +       } else {
Is it possible to get here?
Scsi_scan_host is called only after successful add_wluns

> +               /* device wlun is probed */
> +               hba->luns_avail--;
> +       }
> +}
> +


> 
>  /**
> @@ -7254,6 +7312,14 @@ static int ufshcd_scsi_add_wlus(struct ufs_hba
> *hba)
>                 goto out;
>         }
>         ufshcd_blk_pm_runtime_init(hba->sdev_ufs_device);
> +       /*
> +        * A pm_runtime_put_sync is invoked when this device enables
> blk_pm_runtime
> +        * & would suspend the device-wlun upon timer expiry.
> +        * But suspending device wlun _may_ put the ufs device in the pre-defined
> +        * low power mode (SSU <rpm_lvl>). Probing of other luns may fail then.
> +        * Don't allow this suspend until all the luns have been probed.
Maybe add one more sentence: see pm_runtime_mark_last_busy in ufshcd_setup_links



> -       ufshcd_clear_ua_wluns(hba);
Are there any callers left to ufshcd_clear_ua_wluns?
Can it be removed?

> +       if (hba->wlun_dev_clr_ua)
> +               ufshcd_clear_ua_wlun(hba, UFS_UPIU_UFS_DEVICE_WLUN);
> 
>         cmd[4] = pwr_mode << 4;