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

[Bean Huo <huobean@gmail.com>]

On Tue, 2022-04-12 at 15:31 +0800, Po-Wen Kao wrote:
> Since the HPB mapping is already reset in ufshpb_init by setting
> flag QUERY_FLAG_IDN_HPB_RESET, there is no need doing so again in
> ufshpb_hpb_lu_prepared.
> 
> This would also resolve the issue where HPB WRTIE BUFFER is issued
> before UAC being cleared.
> 
> Signed-off-by: Po-Wen Kao <powen.kao@mediatek.com>
> ---
>  drivers/scsi/ufs/ufshpb.c | 7 -------
>  1 file changed, 7 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> index a86d0cc50de2..5c09d44c4bd5 100644
> --- a/drivers/scsi/ufs/ufshpb.c
> +++ b/drivers/scsi/ufs/ufshpb.c
> @@ -934,11 +934,6 @@ static int ufshpb_issue_umap_single_req(struct
> ufshpb_lu *hpb,
>         return ufshpb_issue_umap_req(hpb, rgn, true);
>  }
>  
> -static int ufshpb_issue_umap_all_req(struct ufshpb_lu *hpb)
> -{
> -       return ufshpb_issue_umap_req(hpb, NULL, false);
> -}
> -
>  static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
>                                  struct ufshpb_region *rgn)
>  {
> @@ -2459,8 +2454,6 @@ 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);


Hi Po-Wen,
Yes, it is redundant in this flow, but it is needed in the reset flow,
I built this cleanup patch, but don't know if it can fix the issue
where HPB WRTIE BUFFER is issued before UAC being cleared. would you
test on your platform? I will verify it on our UFS later.



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)
+		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);