[PATCH v6 05/10] scsi: ufshpb: Region inactivation in host mode

[Avri Altman]

In host mode, the host is expected to send HPB-WRITE-BUFFER with
buffer-id = 0x1 when it inactivates a region.

Use the map-requests pool as there is no point in assigning a
designated cache for umap-requests.

Signed-off-by: Avri Altman <avri.altman@xxxxxxx>
---
 drivers/scsi/ufs/ufshpb.c | 35 +++++++++++++++++++++++++++++++----
 drivers/scsi/ufs/ufshpb.h |  1 +
 2 files changed, 32 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 5e757220d66a..1f0344eaa546 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -904,6 +904,7 @@ static int ufshpb_execute_umap_req(struct ufshpb_lu *hpb,
 
 	blk_execute_rq_nowait(NULL, req, 1, ufshpb_umap_req_compl_fn);
 
+	hpb->stats.umap_req_cnt++;
 	return 0;
 }
 
@@ -1100,18 +1101,37 @@ static int ufshpb_issue_umap_req(struct ufshpb_lu *hpb,
 	return -EAGAIN;
 }
 
+static int ufshpb_issue_umap_single_req(struct ufshpb_lu *hpb,
+					struct ufshpb_region *rgn)
+{
+	return ufshpb_issue_umap_req(hpb, rgn, false);
+}
+
 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)
+static int __ufshpb_evict_region(struct ufshpb_lu *hpb,
+				 struct ufshpb_region *rgn)
 {
 	struct victim_select_info *lru_info;
 	struct ufshpb_subregion *srgn;
 	int srgn_idx;
 
+	lockdep_assert_held(&hpb->rgn_state_lock);
+
+	if (hpb->is_hcm) {
+		unsigned long flags;
+		int ret;
+
+		spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
+		ret = ufshpb_issue_umap_single_req(hpb, rgn);
+		spin_lock_irqsave(&hpb->rgn_state_lock, flags);
+		if (ret)
+			return ret;
+	}
+
 	lru_info = &hpb->lru_info;
 
 	dev_dbg(&hpb->sdev_ufs_lu->sdev_dev, "evict region %d\n", rgn->rgn_idx);
@@ -1120,6 +1140,8 @@ static void __ufshpb_evict_region(struct ufshpb_lu *hpb,
 
 	for_each_sub_region(rgn, srgn_idx, srgn)
 		ufshpb_purge_active_subregion(hpb, srgn);
+
+	return 0;
 }
 
 static int ufshpb_evict_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
@@ -1141,7 +1163,7 @@ static int ufshpb_evict_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
 			goto out;
 		}
 
-		__ufshpb_evict_region(hpb, rgn);
+		ret = __ufshpb_evict_region(hpb, rgn);
 	}
 out:
 	spin_unlock_irqrestore(&hpb->rgn_state_lock, flags);
@@ -1275,7 +1297,9 @@ static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
 				"LRU full (%d), choose victim %d\n",
 				atomic_read(&lru_info->active_cnt),
 				victim_rgn->rgn_idx);
-			__ufshpb_evict_region(hpb, victim_rgn);
+			ret = __ufshpb_evict_region(hpb, victim_rgn);
+			if (ret)
+				goto out;
 		}
 
 		/*
@@ -1839,6 +1863,7 @@ ufshpb_sysfs_attr_show_func(rb_noti_cnt);
 ufshpb_sysfs_attr_show_func(rb_active_cnt);
 ufshpb_sysfs_attr_show_func(rb_inactive_cnt);
 ufshpb_sysfs_attr_show_func(map_req_cnt);
+ufshpb_sysfs_attr_show_func(umap_req_cnt);
 
 static struct attribute *hpb_dev_stat_attrs[] = {
 	&dev_attr_hit_cnt.attr,
@@ -1847,6 +1872,7 @@ static struct attribute *hpb_dev_stat_attrs[] = {
 	&dev_attr_rb_active_cnt.attr,
 	&dev_attr_rb_inactive_cnt.attr,
 	&dev_attr_map_req_cnt.attr,
+	&dev_attr_umap_req_cnt.attr,
 	NULL,
 };
 
@@ -1971,6 +1997,7 @@ static void ufshpb_stat_init(struct ufshpb_lu *hpb)
 	hpb->stats.rb_active_cnt = 0;
 	hpb->stats.rb_inactive_cnt = 0;
 	hpb->stats.map_req_cnt = 0;
+	hpb->stats.umap_req_cnt = 0;
 }
 
 static void ufshpb_param_init(struct ufshpb_lu *hpb)
diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
index 32d72c46c57a..7afc98e61c0a 100644
--- a/drivers/scsi/ufs/ufshpb.h
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -187,6 +187,7 @@ struct ufshpb_stats {
 	u64 rb_inactive_cnt;
 	u64 map_req_cnt;
 	u64 pre_req_cnt;
+	u64 umap_req_cnt;
 };
 
 struct ufshpb_lu {
-- 
2.25.1