linux-kernel - [PATCH v8 03/11] scsi: ufshpb: Transform set_dirty to iterate

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Date:   Sun, 11 Apr 2021 09:27:13 +0300
From:   Avri Altman <avri.altman@....com>
To:     "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, Bart Van Assche <bvanassche@....org>,
        yongmyung lee <ymhungry.lee@...sung.com>,
        Daejun Park <daejun7.park@...sung.com>,
        alim.akhtar@...sung.com, asutoshd@...eaurora.org,
        Zang Leigang <zangleigang@...ilicon.com>,
        Avi Shchislowski <avi.shchislowski@....com>,
        Bean Huo <beanhuo@...ron.com>, cang@...eaurora.org,
        stanley.chu@...iatek.com, Avri Altman <avri.altman@....com>
Subject: [PATCH v8 03/11] scsi: ufshpb: Transform set_dirty to iterate_rgn

Given a transfer length, set_dirty meticulously runs over all the
entries, across subregions and regions if needed. Currently its only use
is to mark dirty blocks, but soon HCM may profit from it as well, when
managing its read counters.

Signed-off-by: Avri Altman <avri.altman@....com>
Reviewed-by: Daejun Park <daejun7.park@...sung.com>
---
 drivers/scsi/ufs/ufshpb.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 6111019ca31a..252fcfb48862 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -144,13 +144,14 @@ static bool ufshpb_is_hpb_rsp_valid(struct ufs_hba *hba,
 	return true;
 }
 
-static void ufshpb_set_ppn_dirty(struct ufshpb_lu *hpb, int rgn_idx,
-				 int srgn_idx, int srgn_offset, int cnt)
+static void ufshpb_iterate_rgn(struct ufshpb_lu *hpb, int rgn_idx, int srgn_idx,
+			       int srgn_offset, int cnt, bool set_dirty)
 {
 	struct ufshpb_region *rgn;
 	struct ufshpb_subregion *srgn;
 	int set_bit_len;
 	int bitmap_len;
+	unsigned long flags;
 
 next_srgn:
 	rgn = hpb->rgn_tbl + rgn_idx;
@@ -166,11 +167,14 @@ static void ufshpb_set_ppn_dirty(struct ufshpb_lu *hpb, int rgn_idx,
 	else
 		set_bit_len = cnt;
 
-	set_bit(RGN_FLAG_DIRTY, &rgn->rgn_flags);
+	if (set_dirty)
+		set_bit(RGN_FLAG_DIRTY, &rgn->rgn_flags);
 
-	if (rgn->rgn_state != HPB_RGN_INACTIVE &&
+	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);
+	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
 
 	srgn_offset = 0;
 	if (++srgn_idx == hpb->srgns_per_rgn) {
@@ -592,10 +596,8 @@ int ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 
 	/* If command type is WRITE or DISCARD, set bitmap as drity */
 	if (ufshpb_is_write_or_discard_cmd(cmd)) {
-		spin_lock_irqsave(&hpb->rgn_state_lock, flags);
-		ufshpb_set_ppn_dirty(hpb, rgn_idx, srgn_idx, srgn_offset,
-				 transfer_len);
-		spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+		ufshpb_iterate_rgn(hpb, rgn_idx, srgn_idx, srgn_offset,
+				   transfer_len, true);
 		return 0;
 	}
 
-- 
2.25.1