linux-kernel - [PATCH 1/4] scsi: ufshpb: re-wind the read timeout on every read

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Date:   Sun,  8 Aug 2021 12:00:21 +0300
From:   Avri Altman <avri.altman@....com>
To:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bart Van Assche <bvanassche@....org>,
        Daejun Park <daejun7.park@...sung.com>,
        Avri Altman <avri.altman@....com>
Subject: [PATCH 1/4] scsi: ufshpb: re-wind the read timeout on every read

The "cold"-timer purpose is not to hang-on to active regions with no
reads.  Therefore the read-timeout should be re-wind on every read, and
not just when the region is activated.

Fixes: 13c044e91678 (scsi: ufs: ufshpb: Add "cold" regions timer)
Signed-off-by: Avri Altman <avri.altman@....com>
---
 drivers/scsi/ufs/ufshpb.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index d0eb14be47a3..8e92c61ed9d4 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -178,9 +178,19 @@ static void ufshpb_iterate_rgn(struct ufshpb_lu *hpb, int rgn_idx, int srgn_idx,
 		set_bit_len = cnt;
 
 	spin_lock_irqsave(&hpb->rgn_state_lock, flags);
-	if (set_dirty && rgn->rgn_state != HPB_RGN_INACTIVE &&
-	    srgn->srgn_state == HPB_SRGN_VALID)
-		bitmap_set(srgn->mctx->ppn_dirty, srgn_offset, set_bit_len);
+	if (rgn->rgn_state != HPB_RGN_INACTIVE) {
+		if (set_dirty) {
+			if (srgn->srgn_state == HPB_SRGN_VALID)
+				bitmap_set(srgn->mctx->ppn_dirty, srgn_offset,
+					   set_bit_len);
+		} else if (hpb->is_hcm) {
+			 /* rewind the read timer for lru regions */
+			rgn->read_timeout = ktime_add_ms(ktime_get(),
+					rgn->hpb->params.read_timeout_ms);
+			rgn->read_timeout_expiries =
+				rgn->hpb->params.read_timeout_expiries;
+		}
+	}
 	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
 
 	if (hpb->is_hcm && prev_srgn != srgn) {
-- 
2.17.1