Re: [PATCH 1/1] scsi: ufs: remove redundant HPB unmap

[Peter Wang <peter.wang@mediatek.com>]

Hi Bean,

How about if reset flow not clear hpb mapping?

After device is reset by RST_N pin, if the hpb mapping table still exist?

BTW, Host seem not clear region mapping table in reset flow.

Thanks.


On 4/12/22 11:20 PM, Bean Huo wrote:
> Hi, Po-Wen,
> Previous email did not properly append the patch, this one is better
> for your review and test.
>
>
>
>
> From: Bean Huo <beanhuo@micron.com>
> Date: Tue, 12 Apr 2022 16:56:34 +0200
> Subject: [PATCH] scsi: ufshpb: UFSHPB cleanup
>
> Remove redundant ufshpb_reset*, and merge into a single helper
> ufshbp_state_toggle().
>
> Delete the redundant Inactivation code of all HPB Regions in the cold
> boot stage,
> and add inactivating all HPB Regions when the HPP status changes from
> HPB_RESET
> to HBP_PRESENT.
>
> Signed-off-by: Bean Huo <beanhuo@micron.com>
> ---
>   drivers/scsi/ufs/ufshcd.c |  4 ++--
>   drivers/scsi/ufs/ufshpb.c | 38 +++++++++++++-------------------------
>   drivers/scsi/ufs/ufshpb.h |  6 ++----
>   3 files changed, 17 insertions(+), 31 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 0899d5b8cdad..d8b59d017ce4 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -7223,7 +7223,7 @@ static int ufshcd_host_reset_and_restore(struct
> ufs_hba *hba)
>   	 * Stop the host controller and complete the requests
>   	 * cleared by h/w
>   	 */
> -	ufshpb_reset_host(hba);
> +	ufshpb_state_toggle(hba, HPB_RESET);
>   	ufshcd_hba_stop(hba);
>   	hba->silence_err_logs = true;
>   	ufshcd_complete_requests(hba);
> @@ -8184,7 +8184,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba,
> bool init_dev_params)
>   	/* Enable Auto-Hibernate if configured */
>   	ufshcd_auto_hibern8_enable(hba);
>   
> -	ufshpb_reset(hba);
> +	ufshpb_state_toggle(hba, HPB_PRESENT);
>   out:
>   	spin_lock_irqsave(hba->host->host_lock, flags);
>   	if (ret)
> diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> index 3ca745ad616c..4ed156031413 100644
> --- a/drivers/scsi/ufs/ufshpb.c
> +++ b/drivers/scsi/ufs/ufshpb.c
> @@ -2278,39 +2278,29 @@ static bool ufshpb_check_hpb_reset_query(struct
> ufs_hba *hba)
>   	return flag_res;
>   }
>   
> -void ufshpb_reset(struct ufs_hba *hba)
> +void ufshpb_state_toggle(struct ufs_hba *hba, enum UFSHPB_STATE state)
>   {
>   	struct ufshpb_lu *hpb;
>   	struct scsi_device *sdev;
>   
>   	shost_for_each_device(sdev, hba->host) {
>   		hpb = ufshpb_get_hpb_data(sdev);
> -		if (!hpb)
> -			continue;
>   
> -		if (ufshpb_get_state(hpb) != HPB_RESET)
> +		if (!hpb || ufshpb_get_state(hpb) != state)
>   			continue;
>   
> -		ufshpb_set_state(hpb, HPB_PRESENT);
> -	}
> -}
> -
> -void ufshpb_reset_host(struct ufs_hba *hba)
> -{
> -	struct ufshpb_lu *hpb;
> -	struct scsi_device *sdev;
> -
> -	shost_for_each_device(sdev, hba->host) {
> -		hpb = ufshpb_get_hpb_data(sdev);
> -		if (!hpb)
> -			continue;
> -
> -		if (ufshpb_get_state(hpb) != HPB_PRESENT)
> -			continue;
> -		ufshpb_set_state(hpb, HPB_RESET);
> -		ufshpb_cancel_jobs(hpb);
> -		ufshpb_discard_rsp_lists(hpb);
> +		ufshpb_set_state(hpb, state);
> +		if (state == HPB_RESET) {
> +			ufshpb_cancel_jobs(hpb);
> +			ufshpb_discard_rsp_lists(hpb);
> +		}
>   	}
> +	/*
> +	 * Inactivating all HPB Region in device side in case HPB
> state changed
> +	 * from HPB_RESET to HPB_PRESENT
> +	 */
> +	if (!hpb->is_hcm && state == HPB_PRESENT)

may need check hpb is not null?

> +		ufshpb_issue_umap_all_req(hpb);
>   }
>   
>   void ufshpb_suspend(struct ufs_hba *hba)
> @@ -2456,8 +2446,6 @@ static void ufshpb_hpb_lu_prepared(struct ufs_hba
> *hba)
>   			ufshpb_set_state(hpb, HPB_PRESENT);
>   			if ((hpb->lu_pinned_end - hpb-
>> lu_pinned_start) > 0)
>   				queue_work(ufshpb_wq, &hpb->map_work);
> -			if (!hpb->is_hcm)
> -				ufshpb_issue_umap_all_req(hpb);
>   		} else {
>   			dev_err(hba->dev, "destroy HPB lu %d\n", hpb-
>> lun);
>   			ufshpb_destroy_lu(hba, sdev);
> diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
> index b475dbd78988..a130f0b16c3e 100644
> --- a/drivers/scsi/ufs/ufshpb.h
> +++ b/drivers/scsi/ufs/ufshpb.h
> @@ -288,8 +288,7 @@ static int ufshpb_prep(struct ufs_hba *hba, struct
> ufshcd_lrb *lrbp) { return 0;
>   static void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb
> *lrbp) {}
>   static void ufshpb_resume(struct ufs_hba *hba) {}
>   static void ufshpb_suspend(struct ufs_hba *hba) {}
> -static void ufshpb_reset(struct ufs_hba *hba) {}
> -static void ufshpb_reset_host(struct ufs_hba *hba) {}
> +static void ufshpb_state_toggle(struct ufs_hba *hba, enum UFSHPB_STATE
> state) {}
>   static void ufshpb_init(struct ufs_hba *hba) {}
>   static void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device
> *sdev) {}
>   static void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device
> *sdev) {}
> @@ -303,8 +302,7 @@ int ufshpb_prep(struct ufs_hba *hba, struct
> ufshcd_lrb *lrbp);
>   void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp);
>   void ufshpb_resume(struct ufs_hba *hba);
>   void ufshpb_suspend(struct ufs_hba *hba);
> -void ufshpb_reset(struct ufs_hba *hba);
> -void ufshpb_reset_host(struct ufs_hba *hba);
> +void ufshpb_state_toggle(struct ufs_hba *hba, enum UFSHPB_STATE
> state);
>   void ufshpb_init(struct ufs_hba *hba);
>   void ufshpb_init_hpb_lu(struct ufs_hba *hba, struct scsi_device
> *sdev);
>   void ufshpb_destroy_lu(struct ufs_hba *hba, struct scsi_device *sdev);