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Date:   Fri, 11 Jun 2021 08:53:46 +0800
From:   Can Guo <cang@codeaurora.org>
To:     Adrian Hunter <adrian.hunter@intel.com>
Cc:     asutoshd@codeaurora.org, nguyenb@codeaurora.org,
        hongwus@codeaurora.org, ziqichen@codeaurora.org,
        linux-scsi@vger.kernel.org, kernel-team@android.com,
        Alim Akhtar <alim.akhtar@samsung.com>,
        Avri Altman <avri.altman@wdc.com>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Stanley Chu <stanley.chu@mediatek.com>,
        Bean Huo <beanhuo@micron.com>,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        Kiwoong Kim <kwmad.kim@samsung.com>,
        Satya Tangirala <satyat@google.com>,
        Bart Van Assche <bvanassche@acm.org>,
        open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 1/9] scsi: ufs: Differentiate status between hba pm ops
 and wl pm ops
In-Reply-To: <7d7a771f-6595-0106-8ee5-4e6407caee56@intel.com>
References: <1623300218-9454-1-git-send-email-cang@codeaurora.org>
 <1623300218-9454-2-git-send-email-cang@codeaurora.org>
 <7d7a771f-6595-0106-8ee5-4e6407caee56@intel.com>
Message-ID: <d53df7c79e6511a1257affefc69f4cf3@codeaurora.org>
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Hi Adrian,

On 2021-06-10 19:15, Adrian Hunter wrote:
> On 10/06/21 7:43 am, Can Guo wrote:
>> Put pm_op_in_progress and is_sys_suspend flags back to ufshcd hba pm 
>> ops,
>> add two new flags, namely wl_pm_op_in_progress and 
>> is_wl_sys_suspended, to
>> track the UFS device W-LU pm ops. This helps us differentiate the 
>> status of
>> hba and wl pm ops when we need to do troubleshooting.
> 
> Really you have 2 changes here:
> 1. Renaming to pm_op_in_progress / is_sys_suspend to
> wl_pm_op_in_progress / is_wl_sys_suspended
> 2. Introducing flags for the status of hba
> 
> So it should really be 2 patches.

Sure I will make it 2 in next version.

> 
> That would show up things like:
> - did you intend not to change hba->is_sys_suspended in 
> ufs_qcom_resume() ?

I missed it - shall change it in next version.

Thanks,
Can Guo.

> 
>> 
>> Signed-off-by: Can Guo <cang@codeaurora.org>
>> ---
>>  drivers/scsi/ufs/ufshcd.c | 42 
>> ++++++++++++++++++++++++++++--------------
>>  drivers/scsi/ufs/ufshcd.h |  4 +++-
>>  2 files changed, 31 insertions(+), 15 deletions(-)
>> 
>> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
>> index 25fe18a..47b2a9a 100644
>> --- a/drivers/scsi/ufs/ufshcd.c
>> +++ b/drivers/scsi/ufs/ufshcd.c
>> @@ -549,7 +549,9 @@ static void ufshcd_print_host_state(struct ufs_hba 
>> *hba)
>>  		hba->saved_err, hba->saved_uic_err);
>>  	dev_err(hba->dev, "Device power mode=%d, UIC link state=%d\n",
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>> -	dev_err(hba->dev, "PM in progress=%d, sys. suspended=%d\n",
>> +	dev_err(hba->dev, "wl_pm_op_in_progress=%d, 
>> is_wl_sys_suspended=%d\n",
>> +		hba->wl_pm_op_in_progress, hba->is_wl_sys_suspended);
>> +	dev_err(hba->dev, "pm_op_in_progress=%d, is_sys_suspended=%d\n",
>>  		hba->pm_op_in_progress, hba->is_sys_suspended);
>>  	dev_err(hba->dev, "Auto BKOPS=%d, Host self-block=%d\n",
>>  		hba->auto_bkops_enabled, hba->host->host_self_blocked);
>> @@ -1999,7 +2001,7 @@ static void ufshcd_clk_scaling_start_busy(struct 
>> ufs_hba *hba)
>>  	if (!hba->clk_scaling.active_reqs++)
>>  		queue_resume_work = true;
>> 
>> -	if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) {
>> +	if (!hba->clk_scaling.is_enabled || hba->wl_pm_op_in_progress) {
>>  		spin_unlock_irqrestore(hba->host->host_lock, flags);
>>  		return;
>>  	}
>> @@ -2734,7 +2736,7 @@ static int ufshcd_queuecommand(struct Scsi_Host 
>> *host, struct scsi_cmnd *cmd)
>>  		 * err handler blocked for too long. So, just fail the scsi cmd
>>  		 * sent from PM ops, err handler can recover PM error anyways.
>>  		 */
>> -		if (hba->pm_op_in_progress) {
>> +		if (hba->wl_pm_op_in_progress) {
>>  			hba->force_reset = true;
>>  			set_host_byte(cmd, DID_BAD_TARGET);
>>  			cmd->scsi_done(cmd);
>> @@ -2767,7 +2769,7 @@ static int ufshcd_queuecommand(struct Scsi_Host 
>> *host, struct scsi_cmnd *cmd)
>>  		(hba->clk_gating.state != CLKS_ON));
>> 
>>  	if (unlikely(test_bit(tag, &hba->outstanding_reqs))) {
>> -		if (hba->pm_op_in_progress)
>> +		if (hba->wl_pm_op_in_progress)
>>  			set_host_byte(cmd, DID_BAD_TARGET);
>>  		else
>>  			err = SCSI_MLQUEUE_HOST_BUSY;
>> @@ -5116,7 +5118,7 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, 
>> struct ufshcd_lrb *lrbp)
>>  			 * solution could be to abort the system suspend if
>>  			 * UFS device needs urgent BKOPs.
>>  			 */
>> -			if (!hba->pm_op_in_progress &&
>> +			if (!hba->wl_pm_op_in_progress &&
>>  			    !ufshcd_eh_in_progress(hba) &&
>>  			    ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
>>  				/* Flushed in suspend */
>> @@ -5916,7 +5918,7 @@ static void ufshcd_err_handling_prepare(struct 
>> ufs_hba *hba)
>>  {
>>  	ufshcd_rpm_get_sync(hba);
>>  	if (pm_runtime_status_suspended(&hba->sdev_ufs_device->sdev_gendev) 
>> ||
>> -	    hba->is_sys_suspended) {
>> +	    hba->is_wl_sys_suspended) {
>>  		enum ufs_pm_op pm_op;
>> 
>>  		/*
>> @@ -5933,7 +5935,7 @@ static void ufshcd_err_handling_prepare(struct 
>> ufs_hba *hba)
>>  		if (!ufshcd_is_clkgating_allowed(hba))
>>  			ufshcd_setup_clocks(hba, true);
>>  		ufshcd_release(hba);
>> -		pm_op = hba->is_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
>> +		pm_op = hba->is_wl_sys_suspended ? UFS_SYSTEM_PM : UFS_RUNTIME_PM;
>>  		ufshcd_vops_resume(hba, pm_op);
>>  	} else {
>>  		ufshcd_hold(hba, false);
>> @@ -5976,7 +5978,7 @@ static void ufshcd_recover_pm_error(struct 
>> ufs_hba *hba)
>>  	struct request_queue *q;
>>  	int ret;
>> 
>> -	hba->is_sys_suspended = false;
>> +	hba->is_wl_sys_suspended = false;
>>  	/*
>>  	 * Set RPM status of wlun device to RPM_ACTIVE,
>>  	 * this also clears its runtime error.
>> @@ -8784,7 +8786,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba 
>> *hba, enum ufs_pm_op pm_op)
>>  	enum ufs_dev_pwr_mode req_dev_pwr_mode;
>>  	enum uic_link_state req_link_state;
>> 
>> -	hba->pm_op_in_progress = true;
>> +	hba->wl_pm_op_in_progress = true;
>>  	if (pm_op != UFS_SHUTDOWN_PM) {
>>  		pm_lvl = pm_op == UFS_RUNTIME_PM ?
>>  			 hba->rpm_lvl : hba->spm_lvl;
>> @@ -8919,7 +8921,7 @@ static int __ufshcd_wl_suspend(struct ufs_hba 
>> *hba, enum ufs_pm_op pm_op)
>>  		hba->clk_gating.is_suspended = false;
>>  		ufshcd_release(hba);
>>  	}
>> -	hba->pm_op_in_progress = false;
>> +	hba->wl_pm_op_in_progress = false;
>>  	return ret;
>>  }
>> 
>> @@ -8928,7 +8930,7 @@ static int __ufshcd_wl_resume(struct ufs_hba 
>> *hba, enum ufs_pm_op pm_op)
>>  	int ret;
>>  	enum uic_link_state old_link_state = hba->uic_link_state;
>> 
>> -	hba->pm_op_in_progress = true;
>> +	hba->wl_pm_op_in_progress = true;
>> 
>>  	/*
>>  	 * Call vendor specific resume callback. As these callbacks may 
>> access
>> @@ -9006,7 +9008,7 @@ static int __ufshcd_wl_resume(struct ufs_hba 
>> *hba, enum ufs_pm_op pm_op)
>>  		ufshcd_update_evt_hist(hba, UFS_EVT_WL_RES_ERR, (u32)ret);
>>  	hba->clk_gating.is_suspended = false;
>>  	ufshcd_release(hba);
>> -	hba->pm_op_in_progress = false;
>> +	hba->wl_pm_op_in_progress = false;
>>  	return ret;
>>  }
>> 
>> @@ -9072,7 +9074,7 @@ static int ufshcd_wl_suspend(struct device *dev)
>> 
>>  out:
>>  	if (!ret)
>> -		hba->is_sys_suspended = true;
>> +		hba->is_wl_sys_suspended = true;
>>  	trace_ufshcd_wl_suspend(dev_name(dev), ret,
>>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>> @@ -9100,7 +9102,7 @@ static int ufshcd_wl_resume(struct device *dev)
>>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>>  	if (!ret)
>> -		hba->is_sys_suspended = false;
>> +		hba->is_wl_sys_suspended = false;
>>  	up(&hba->host_sem);
>>  	return ret;
>>  }
>> @@ -9141,6 +9143,8 @@ static int ufshcd_suspend(struct ufs_hba *hba)
>> 
>>  	if (!hba->is_powered)
>>  		return 0;
>> +
>> +	hba->pm_op_in_progress = true;
>>  	/*
>>  	 * Disable the host irq as host controller as there won't be any
>>  	 * host controller transaction expected till resume.
>> @@ -9160,6 +9164,7 @@ static int ufshcd_suspend(struct ufs_hba *hba)
>>  	ufshcd_vreg_set_lpm(hba);
>>  	/* Put the host controller in low power mode if possible */
>>  	ufshcd_hba_vreg_set_lpm(hba);
>> +	hba->pm_op_in_progress = false;
>>  	return ret;
>>  }
>> 
>> @@ -9179,6 +9184,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
>>  	if (!hba->is_powered)
>>  		return 0;
>> 
>> +	hba->pm_op_in_progress = true;
>>  	ufshcd_hba_vreg_set_hpm(hba);
>>  	ret = ufshcd_vreg_set_hpm(hba);
>>  	if (ret)
>> @@ -9198,6 +9204,7 @@ static int ufshcd_resume(struct ufs_hba *hba)
>>  out:
>>  	if (ret)
>>  		ufshcd_update_evt_hist(hba, UFS_EVT_RESUME_ERR, (u32)ret);
>> +	hba->pm_op_in_progress = false;
>>  	return ret;
>>  }
>> 
>> @@ -9222,6 +9229,10 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
>>  	trace_ufshcd_system_suspend(dev_name(hba->dev), ret,
>>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>> +
>> +	if (!ret)
>> +		hba->is_sys_suspended = true;
>> +
>>  	return ret;
>>  }
>>  EXPORT_SYMBOL(ufshcd_system_suspend);
>> @@ -9248,6 +9259,9 @@ int ufshcd_system_resume(struct ufs_hba *hba)
>>  		ktime_to_us(ktime_sub(ktime_get(), start)),
>>  		hba->curr_dev_pwr_mode, hba->uic_link_state);
>> 
>> +	if (!ret)
>> +		hba->is_sys_suspended = false;
>> +
>>  	return ret;
>>  }
>>  EXPORT_SYMBOL(ufshcd_system_resume);
>> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
>> index c98d540..eaebb4e 100644
>> --- a/drivers/scsi/ufs/ufshcd.h
>> +++ b/drivers/scsi/ufs/ufshcd.h
>> @@ -752,7 +752,8 @@ struct ufs_hba {
>>  	enum ufs_pm_level spm_lvl;
>>  	struct device_attribute rpm_lvl_attr;
>>  	struct device_attribute spm_lvl_attr;
>> -	int pm_op_in_progress;
>> +	bool pm_op_in_progress;
>> +	bool wl_pm_op_in_progress;
>> 
>>  	/* Auto-Hibernate Idle Timer register value */
>>  	u32 ahit;
>> @@ -839,6 +840,7 @@ struct ufs_hba {
>>  	struct devfreq *devfreq;
>>  	struct ufs_clk_scaling clk_scaling;
>>  	bool is_sys_suspended;
>> +	bool is_wl_sys_suspended;
>> 
>>  	enum bkops_status urgent_bkops_lvl;
>>  	bool is_urgent_bkops_lvl_checked;
>>