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From: Maramaina Naresh <quic_mnaresh@quicinc.com>
To: "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen"
	<martin.petersen@oracle.com>,
        Peter Wang <peter.wang@mediatek.com>,
        "Matthias
 Brugger" <matthias.bgg@gmail.com>,
        AngeloGioacchino Del Regno
	<angelogioacchino.delregno@collabora.com>
CC: Alim Akhtar <alim.akhtar@samsung.com>, Avri Altman <avri.altman@wdc.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Stanley Jhu <chu.stanley@gmail.com>, <linux-scsi@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>, <linux-mediatek@lists.infradead.org>,
        <linux-arm-kernel@lists.infradead.org>, <quic_cang@quicinc.com>,
        <quic_nguyenb@quicinc.com>
Subject: [PATCH V6 0/2] Add CPU latency QoS support for ufs driver
Date: Tue, 19 Dec 2023 18:07:04 +0530
Message-ID: <20231219123706.6463-1-quic_mnaresh@quicinc.com>
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MIME-Version: 1.0
Content-Type: text/plain

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 v5:
- Addressed bvanassche comment to use kstrtobool instead kstrtou32
- Addressed bvanassche comment to add sys attribute into an existing group

Changes from v4:
- Addressed angelogioacchino's comment to update commit text
- Addressed angelogioacchino's comment to code alignment

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
- Design is changed from per-device PM QoS to CPU latency QoS based support
- Reverted existing PM QoS feature from MEDIATEK UFS driver
- Added PM QoS capability for both QCOM and MEDIATEK SoCs

Maramaina Naresh (2):
  ufs: core: Add CPU latency QoS support for ufs driver
  ufs: ufs-mediatek: Migrate to UFSHCD generic CPU latency PM QoS
    support

 drivers/ufs/core/ufs-sysfs.c    | 49 ++++++++++++++++++++++++++++++++
 drivers/ufs/core/ufshcd.c       | 50 +++++++++++++++++++++++++++++++++
 drivers/ufs/host/ufs-mediatek.c | 17 -----------
 drivers/ufs/host/ufs-mediatek.h |  3 --
 include/ufs/ufshcd.h            |  6 ++++
 5 files changed, 105 insertions(+), 20 deletions(-)

-- 
2.17.1