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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 v5 08/10] scsi: ufshpb: Limit the number of inflight map requests
Date: Tue,  2 Mar 2021 15:25:01 +0200	[thread overview]
Message-ID: <20210302132503.224670-9-avri.altman@wdc.com> (raw)
In-Reply-To: <20210302132503.224670-1-avri.altman@wdc.com>

in host control mode the host is the originator of map requests. To not
flood the device with map requests, use a simple throttling mechanism
that limits the number of inflight map requests.

Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
 drivers/scsi/ufs/ufshpb.c | 11 +++++++++++
 drivers/scsi/ufs/ufshpb.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
index 89a930e72cff..74da69727340 100644
--- a/drivers/scsi/ufs/ufshpb.c
+++ b/drivers/scsi/ufs/ufshpb.c
@@ -21,6 +21,7 @@
 #define READ_TO_MS 1000
 #define READ_TO_EXPIRIES 100
 #define POLLING_INTERVAL_MS 200
+#define THROTTLE_MAP_REQ_DEFAULT 1
 
 /* memory management */
 static struct kmem_cache *ufshpb_mctx_cache;
@@ -750,6 +751,14 @@ static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
 	struct ufshpb_req *map_req;
 	struct bio *bio;
 
+	if (hpb->is_hcm &&
+	    hpb->num_inflight_map_req >= THROTTLE_MAP_REQ_DEFAULT) {
+		dev_info(&hpb->sdev_ufs_lu->sdev_dev,
+			 "map_req throttle. inflight %d throttle %d",
+			 hpb->num_inflight_map_req, THROTTLE_MAP_REQ_DEFAULT);
+		return NULL;
+	}
+
 	map_req = ufshpb_get_req(hpb, srgn->rgn_idx, REQ_OP_SCSI_IN);
 	if (!map_req)
 		return NULL;
@@ -764,6 +773,7 @@ static struct ufshpb_req *ufshpb_get_map_req(struct ufshpb_lu *hpb,
 
 	map_req->rb.srgn_idx = srgn->srgn_idx;
 	map_req->rb.mctx = srgn->mctx;
+	hpb->num_inflight_map_req++;
 
 	return map_req;
 }
@@ -773,6 +783,7 @@ static void ufshpb_put_map_req(struct ufshpb_lu *hpb,
 {
 	bio_put(map_req->bio);
 	ufshpb_put_req(hpb, map_req);
+	hpb->num_inflight_map_req--;
 }
 
 static int ufshpb_clear_dirty_bitmap(struct ufshpb_lu *hpb,
diff --git a/drivers/scsi/ufs/ufshpb.h b/drivers/scsi/ufs/ufshpb.h
index b49e9a34267f..d83ab488688a 100644
--- a/drivers/scsi/ufs/ufshpb.h
+++ b/drivers/scsi/ufs/ufshpb.h
@@ -212,6 +212,7 @@ struct ufshpb_lu {
 	struct ufshpb_req *pre_req;
 	int num_inflight_pre_req;
 	int throttle_pre_req;
+	int num_inflight_map_req;
 	struct list_head lh_pre_req_free;
 	int cur_read_id;
 	int pre_req_min_tr_len;
-- 
2.25.1


  parent reply	other threads:[~2021-03-02 16:18 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-02 13:24 [PATCH v5 00/10] Add Host control mode to HPB Avri Altman
2021-03-02 13:24 ` [PATCH v5 01/10] scsi: ufshpb: Cache HPB Control mode on init Avri Altman
2021-03-02 13:24 ` [PATCH v5 02/10] scsi: ufshpb: Add host control mode support to rsp_upiu Avri Altman
2021-03-02 13:24 ` [PATCH v5 03/10] scsi: ufshpb: Add region's reads counter Avri Altman
2021-03-11  7:52   ` Can Guo
2021-03-11  8:04     ` Avri Altman
2021-03-11  8:07       ` Can Guo
2021-03-15  3:16   ` Can Guo
2021-03-15  9:20     ` Avri Altman
2021-03-15  9:31       ` Can Guo
2021-03-17  9:19         ` Avri Altman
2021-03-15  8:40   ` Can Guo
2021-03-15  9:22     ` Avri Altman
2021-03-02 13:24 ` [PATCH v5 04/10] scsi: ufshpb: Make eviction depends on region's reads Avri Altman
2021-03-11  7:53   ` Can Guo
2021-03-11  8:06     ` Avri Altman
2021-03-15  8:30   ` Can Guo
2021-03-16  8:34     ` Avri Altman
2021-03-02 13:24 ` [PATCH v5 05/10] scsi: ufshpb: Region inactivation in host mode Avri Altman
2021-03-11  8:20   ` Can Guo
2021-03-11  9:03     ` Avri Altman
2021-03-15  4:02   ` Can Guo
2021-03-15  7:33     ` Can Guo
2021-03-16  8:30       ` Avri Altman
2021-03-17  1:23         ` Can Guo
     [not found]       ` <CGME20210316083014epcas2p32d6b84e689cdbe06ee065c870b236d65@epcms2p3>
2021-03-17  2:28         ` Daejun Park
2021-03-17  4:41           ` Can Guo
2021-03-17  7:59             ` Avri Altman
     [not found]           ` <CGME20210316083014epcas2p32d6b84e689cdbe06ee065c870b236d65@epcms2p4>
2021-03-17  5:19             ` Daejun Park
2021-03-17  5:34               ` Can Guo
     [not found]               ` <CGME20210316083014epcas2p32d6b84e689cdbe06ee065c870b236d65@epcms2p6>
2021-03-17  5:42                 ` Daejun Park
2021-03-02 13:24 ` [PATCH v5 06/10] scsi: ufshpb: Add hpb dev reset response Avri Altman
2021-03-15  1:34   ` Can Guo
2021-03-15  6:40     ` Can Guo
2021-03-15  7:42     ` Avri Altman
2021-03-17 10:56   ` Can Guo
2021-03-17 11:23     ` Avri Altman
2021-03-17 12:12       ` Can Guo
2021-03-17 12:22         ` Avri Altman
2021-03-17 13:50           ` Can Guo
2021-03-17 14:22             ` Avri Altman
2021-03-17 14:36               ` Can Guo
2021-03-17 15:46                 ` Avri Altman
2021-03-18  1:00                   ` Can Guo
2021-03-18  8:04                     ` Avri Altman
2021-03-02 13:25 ` [PATCH v5 07/10] scsi: ufshpb: Add "Cold" regions timer Avri Altman
2021-03-15  1:37   ` Can Guo
2021-03-15  7:54     ` Avri Altman
2021-03-15  9:36   ` Can Guo
2021-03-16  9:21     ` Avri Altman
2021-03-17  2:45       ` Can Guo
2021-03-17  7:55         ` Avri Altman
2021-06-01 16:22           ` Bart Van Assche
2021-03-02 13:25 ` Avri Altman [this message]
2021-03-15  8:31   ` [PATCH v5 08/10] scsi: ufshpb: Limit the number of inflight map requests Can Guo
2021-03-16  8:32     ` Avri Altman
2021-03-02 13:25 ` [PATCH v5 09/10] scsi: ufshpb: Add support for host control mode Avri Altman
2021-03-02 13:25 ` [PATCH v5 10/10] scsi: ufshpb: Make host mode parameters configurable Avri Altman

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