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From: Avri Altman <Avri.Altman@wdc.com>
To: "daejun7.park@samsung.com" <daejun7.park@samsung.com>,
	"James E . J . Bottomley" <jejb@linux.vnet.ibm.com>,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	Bart Van Assche <bvanassche@acm.org>,
	yongmyung lee <ymhungry.lee@samsung.com>,
	ALIM AKHTAR <alim.akhtar@samsung.com>,
	"asutoshd@codeaurora.org" <asutoshd@codeaurora.org>,
	Zang Leigang <zangleigang@hisilicon.com>,
	Avi Shchislowski <Avi.Shchislowski@wdc.com>,
	Bean Huo <beanhuo@micron.com>,
	"cang@codeaurora.org" <cang@codeaurora.org>,
	"stanley.chu@mediatek.com" <stanley.chu@mediatek.com>
Subject: RE: [PATCH v11 12/12] scsi: ufshpb: Make host mode parameters configurable
Date: Mon, 21 Jun 2021 06:43:11 +0000	[thread overview]
Message-ID: <DM6PR04MB6575BF2A411BDDF7832A844AFC0A9@DM6PR04MB6575.namprd04.prod.outlook.com> (raw)
In-Reply-To: <2038148563.21624252502579.JavaMail.epsvc@epcpadp3>

> Hi Avri,
> 
> >diff --git a/Documentation/ABI/testing/sysfs-driver-ufs
> b/Documentation/ABI/testing/sysfs-driver-ufs
> >index d001f008312b..b10cecb286df 100644
> >--- a/Documentation/ABI/testing/sysfs-driver-ufs
> >+++ b/Documentation/ABI/testing/sysfs-driver-ufs
> >@@ -1449,7 +1449,7 @@ Description:        This entry shows the maximum
> HPB data size for using single HPB
> >
> >                 The file is read only.
> >
> >-What:                /sys/bus/platform/drivers/ufshcd/*/flags/wb_enable
> >+What:                /sys/bus/platform/drivers/ufshcd/*/flags/hpb_enable
> 
> This part seems to be the problem with my patch. I will correct it.
Maybe if just another spin is really required?

> 
> ...
> 
> >diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
> >index ab66919f4065..6f2ded8c63b0 100644
> >--- a/drivers/scsi/ufs/ufshpb.c
> >+++ b/drivers/scsi/ufs/ufshpb.c
> 
> ...
> 
> >@@ -1697,6 +1704,7 @@ static void
> ufshpb_normalization_work_handler(struct work_struct *work)
> >         struct ufshpb_lu *hpb = container_of(work, struct ufshpb_lu,
> >                                              ufshpb_normalization_work);
> >         int rgn_idx;
> >+        u8 factor = hpb->params.normalization_factor;
> >
> >         for (rgn_idx = 0; rgn_idx < hpb->rgns_per_lu; rgn_idx++) {
> >                 struct ufshpb_region *rgn = hpb->rgn_tbl + rgn_idx;
> >@@ -1707,7 +1715,7 @@ static void
> ufshpb_normalization_work_handler(struct work_struct *work)
> >                 for (srgn_idx = 0; srgn_idx < hpb->srgns_per_rgn; srgn_idx++) {
> >                         struct ufshpb_subregion *srgn = rgn->srgn_tbl + srgn_idx;
> >
> >-                        srgn->reads >>= 1;
> >+                        srgn->reads >>= factor;
> >                         rgn->reads += srgn->reads;
> 
> How about changing it to "rgn->read >>=factor" and placing it outside the
> for statement?
I think zeroing rgn->reads before the loop and then rgn->reads += srgn->reads
Making it clear, even as far as doc, that the region reads is the sum over its subregions.

Anyway, this code was introduced in patch 4, so I will fix it there only if you find it really necessary.

Thanks,
Avri

  reply	other threads:[~2021-06-21  6:43 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-16 11:27 [PATCH v11 00/12] Add Host control mode to HPB Avri Altman
2021-06-16 11:27 ` [PATCH v11 01/12] scsi: ufshpb: Cache HPB Control mode on init Avri Altman
2021-06-16 11:27 ` [PATCH v11 02/12] scsi: ufshpb: Add host control mode support to rsp_upiu Avri Altman
2021-06-16 11:27 ` [PATCH v11 03/12] scsi: ufshpb: Transform set_dirty to iterate_rgn Avri Altman
2021-06-16 11:27 ` [PATCH v11 04/12] scsi: ufshpb: Add reads counter Avri Altman
2021-06-16 11:27 ` [PATCH v11 05/12] scsi: ufshpb: Make eviction depends on region's reads Avri Altman
2021-06-16 11:27 ` [PATCH v11 06/12] scsi: ufshpb: Region inactivation in host mode Avri Altman
2021-06-16 11:27 ` [PATCH v11 07/12] scsi: ufshpb: Add hpb dev reset response Avri Altman
2021-06-16 11:27 ` [PATCH v11 08/12] scsi: ufshpb: Add "Cold" regions timer Avri Altman
2021-06-16 11:27 ` [PATCH v11 09/12] scsi: ufshpb: Limit the number of inflight map requests Avri Altman
2021-06-16 11:27 ` [PATCH v11 10/12] scsi: ufshpb: Do not send umap_all in host control mode Avri Altman
2021-06-16 11:27 ` [PATCH v11 11/12] scsi: ufshpb: Add support for " Avri Altman
2021-06-16 11:28 ` [PATCH v11 12/12] scsi: ufshpb: Make host mode parameters configurable Avri Altman
     [not found] ` <CGME20210616113004epcas2p41cf111449e118965ae71aaaee1d3bd5c@epcms2p8>
2021-06-21  5:12   ` Daejun Park
2021-06-21  6:43     ` Avri Altman [this message]
     [not found]     ` <CGME20210616113004epcas2p41cf111449e118965ae71aaaee1d3bd5c@epcms2p4>
2021-06-21  7:25       ` Daejun Park
     [not found] ` <CGME20210616112925epcas2p1267d33aee5fa552333a0503207e262f2@epcms2p1>
2021-06-21  5:17   ` [PATCH v11 08/12] scsi: ufshpb: Add "Cold" regions timer Daejun Park
2021-06-21  7:03     ` Avri Altman
     [not found]     ` <CGME20210616112925epcas2p1267d33aee5fa552333a0503207e262f2@epcms2p8>
2021-06-21  7:33       ` Daejun Park

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