From: Avri Altman <avri.altman@wdc.com>
To: "James E . J . Bottomley" <jejb@linux.vnet.ibm.com>,
"Martin K . Petersen" <martin.petersen@oracle.com>,
linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: gregkh@linuxfoundation.org, Bart Van Assche <bvanassche@acm.org>,
yongmyung lee <ymhungry.lee@samsung.com>,
Daejun Park <daejun7.park@samsung.com>,
alim.akhtar@samsung.com, asutoshd@codeaurora.org,
Zang Leigang <zangleigang@hisilicon.com>,
Avi Shchislowski <avi.shchislowski@wdc.com>,
Bean Huo <beanhuo@micron.com>,
cang@codeaurora.org, stanley.chu@mediatek.com,
Avri Altman <avri.altman@wdc.com>
Subject: [PATCH v3 4/9] scsi: ufshpb: Make eviction depends on region's reads
Date: Thu, 18 Feb 2021 15:19:27 +0200 [thread overview]
Message-ID: <20210218131932.106997-5-avri.altman@wdc.com> (raw)
In-Reply-To: <20210218131932.106997-1-avri.altman@wdc.com>
In host mode, eviction is considered an extreme measure.
verify that the entering region has enough reads, and the exiting
region has much less reads.
Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
drivers/scsi/ufs/ufshpb.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 348185964c32..9cb17c97cf93 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -17,6 +17,7 @@
#include "../sd.h"
#define ACTIVATION_THRESHOLD 4 /* 4 IOs */
+#define EVICTION_THRESHOLD (ACTIVATION_THRESHOLD << 6) /* 256 IOs */
/* memory management */
static struct kmem_cache *ufshpb_mctx_cache;
@@ -995,6 +996,13 @@ static struct ufshpb_region *ufshpb_victim_lru_info(struct ufshpb_lu *hpb)
if (ufshpb_check_srgns_issue_state(hpb, rgn))
continue;
+ /*
+ * in host control mode, verify that the exiting region
+ * has less reads
+ */
+ if (hpb->is_hcm && rgn->reads > (EVICTION_THRESHOLD >> 1))
+ continue;
+
victim_rgn = rgn;
break;
}
@@ -1150,7 +1158,7 @@ static int ufshpb_issue_map_req(struct ufshpb_lu *hpb,
static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
{
- struct ufshpb_region *victim_rgn;
+ struct ufshpb_region *victim_rgn = NULL;
struct victim_select_info *lru_info = &hpb->lru_info;
unsigned long flags;
int ret = 0;
@@ -1178,6 +1186,16 @@ static int ufshpb_add_region(struct ufshpb_lu *hpb, struct ufshpb_region *rgn)
* because the device could detect this region
* by not issuing HPB_READ
*/
+
+ /*
+ * in host control mode, verify that the entering
+ * region has enough reads
+ */
+ if (hpb->is_hcm && rgn->reads < EVICTION_THRESHOLD) {
+ ret = -EACCES;
+ goto out;
+ }
+
victim_rgn = ufshpb_victim_lru_info(hpb);
if (!victim_rgn) {
dev_warn(&hpb->sdev_ufs_lu->sdev_dev,
--
2.25.1
next prev parent reply other threads:[~2021-02-18 15:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-18 13:19 [PATCH v3 0/9] Add Host control mode to HPB Avri Altman
2021-02-18 13:19 ` [PATCH v3 1/9] scsi: ufshpb: Cache HPB Control mode on init Avri Altman
2021-02-18 13:19 ` [PATCH v3 2/9] scsi: ufshpb: Add host control mode support to rsp_upiu Avri Altman
2021-02-18 13:19 ` [PATCH v3 3/9] scsi: ufshpb: Add region's reads counter Avri Altman
2021-02-18 13:19 ` Avri Altman [this message]
2021-02-18 13:19 ` [PATCH v3 5/9] scsi: ufshpb: Region inactivation in host mode Avri Altman
2021-02-18 13:19 ` [PATCH v3 6/9] scsi: ufshpb: Add hpb dev reset response Avri Altman
2021-02-18 13:19 ` [PATCH v3 7/9] scsi: ufshpb: Add "Cold" regions timer Avri Altman
2021-02-18 13:19 ` [PATCH v3 8/9] scsi: ufshpb: Add support for host control mode Avri Altman
2021-02-18 13:19 ` [PATCH v3 9/9] scsi: ufshpb: Make host mode parameters configurable Avri Altman
2021-02-18 13:48 ` Greg KH
2021-02-18 14:09 ` Avri Altman
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