scsi: ufs: ufshpb: Add reads counter

In host control mode, reads are the major source of activation trials.
Keep track of those reads counters, for both active as well inactive
regions.

We reset the read counter upon write - we are only interested in "clean"
reads.

Keep those counters normalized, as we are using those reads as a
comparative score, to make various decisions.  If during consecutive
normalizations an active region has exhaust its reads - inactivate it.

While at it, protect the {active,inactive}_count stats by adding them into
the applicable handler.

Link: https://lore.kernel.org/r/20210712095039.8093-5-avri.altman@wdc.com
Reviewed-by: Daejun Park <daejun7.park@samsung.com>
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
index 9ab502f82835..33d163e76d41 100644
--- a/drivers/scsi/ufs/ufshpb.h
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -106,6 +106,10 @@ struct ufshpb_subregion {
 	int rgn_idx;
 	int srgn_idx;
 	bool is_last;
+
+	/* subregion reads - for host mode */
+	unsigned int reads;
+
 	/* below information is used by rsp_list */
 	struct list_head list_act_srgn;
 };
@@ -123,6 +127,10 @@ struct ufshpb_region {
 	struct list_head list_lru_rgn;
 	unsigned long rgn_flags;
 #define RGN_FLAG_DIRTY 0
+
+	/* region reads - for host mode */
+	spinlock_t rgn_lock;
+	unsigned int reads;
 };
 
 #define for_each_sub_region(rgn, i, srgn)				\
@@ -212,6 +220,7 @@ struct ufshpb_lu {
 
 	/* for selecting victim */
 	struct victim_select_info lru_info;
+	struct work_struct ufshpb_normalization_work;
 
 	/* pinned region information */
 	u32 lu_pinned_start;