Re: [PATCH v3 1/9] scsi: ufs: Differentiate status between hba pm ops and wl pm ops

[Adrian Hunter <adrian.hunter@intel.com>]

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.

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

> 
> 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;
>