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Date: Thu, 10 Jun 2021 14:15:29 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Can Guo <cang@...eaurora.org>, asutoshd@...eaurora.org,
nguyenb@...eaurora.org, hongwus@...eaurora.org,
ziqichen@...eaurora.org, linux-scsi@...r.kernel.org,
kernel-team@...roid.com
Cc: Alim Akhtar <alim.akhtar@...sung.com>,
Avri Altman <avri.altman@....com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Stanley Chu <stanley.chu@...iatek.com>,
Bean Huo <beanhuo@...ron.com>,
Jaegeuk Kim <jaegeuk@...nel.org>,
Kiwoong Kim <kwmad.kim@...sung.com>,
Satya Tangirala <satyat@...gle.com>,
Bart Van Assche <bvanassche@....org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/9] scsi: ufs: Differentiate status between hba pm ops
and wl pm ops
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@...eaurora.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;
>
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