linux-kernel - [PATCH V4 0/2] Add CPU latency QoS support for ufs driver

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Message-ID: <20231213103642.15320-1-quic_mnaresh@quicinc.com>
Date:   Wed, 13 Dec 2023 16:06:40 +0530
From:   Maramaina Naresh <quic_mnaresh@...cinc.com>
To:     "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Peter Wang <peter.wang@...iatek.com>,
        "Matthias Brugger" <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <stanley.chu@...iatek.com>
CC:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        Bart Van Assche <bvanassche@....org>,
        Stanley Jhu <chu.stanley@...il.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>, <quic_cang@...cinc.com>,
        <quic_nguyenb@...cinc.com>
Subject: [PATCH V4 0/2] Add CPU latency QoS support for ufs driver 

Add CPU latency QoS support for ufs driver. This improves random io
performance by 15% for ufs.

tiotest benchmark tool io performance results on sm8550 platform:

1. Without PM QoS support
	Type (Speed in)    | Average of 18 iterations
	Random Read(IPOS)  | 37101.3
	Random Write(IPOS) | 41065.13

2. With PM QoS support
	Type (Speed in)    | Average of 18 iterations
	Random Read(IPOS)  | 42943.4
	Random Write(IPOS) | 46784.9
(Improvement with PM QoS = ~15%).

This patch is based on below patch by Stanley Chu [1]. 
Moving the PM QoS code to ufshcd.c and making it generic.

[1] https://lore.kernel.org/r/20220623035052.18802-8-stanley.chu@mediatek.com

Changes from v3:
- Removed UFSHCD_CAP_PM_QOS capability flag from patch#2.

Changes from v2:
- Addressed bvanassche and mani comments
- Provided sysfs interface to enable/disable PM QoS feature

Changes from v1:
- Addressed bvanassche comments to have the code in core ufshcd

Maramaina Naresh (2):
  ufs: core: Add CPU latency QoS support for ufs driver
  ufs: ufs-mediatek: Enable CPU latency PM QoS support for MEDIATEK SoC

 drivers/ufs/core/ufshcd.c       | 127 ++++++++++++++++++++++++++++++++
 drivers/ufs/host/ufs-mediatek.c |  17 -----
 drivers/ufs/host/ufs-mediatek.h |   3 -
 include/ufs/ufshcd.h            |   6 ++
 4 files changed, 133 insertions(+), 20 deletions(-)

-- 
2.17.1