From: Asutosh Das <quic_asutoshd@quicinc.com>
To: Bart Van Assche <bvanassche@acm.org>
Cc: <quic_cang@quicinc.com>, <martin.petersen@oracle.com>,
<linux-scsi@vger.kernel.org>, <quic_nguyenb@quicinc.com>,
<quic_xiaosenh@quicinc.com>, <stanley.chu@mediatek.com>,
<eddie.huang@mediatek.com>, <daejun7.park@samsung.com>,
<avri.altman@wdc.com>, <mani@kernel.org>, <beanhuo@micron.com>,
<quic_richardp@quicinc.com>, <linux-arm-msm@vger.kernel.org>,
Alim Akhtar <alim.akhtar@samsung.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability
Date: Fri, 28 Oct 2022 09:51:16 -0700 [thread overview]
Message-ID: <20221028165116.GC9077@asutoshd-linux1.qualcomm.com> (raw)
In-Reply-To: <14a5925b-df2b-3f84-ed99-b4157c0a1b21@acm.org>
On Thu, Oct 27 2022 at 14:10 -0700, Bart Van Assche wrote:
>On 10/20/22 11:03, Asutosh Das wrote:
>>+
>>+ /*
>>+ * This capability allows the host controller driver to turn on/off
>>+ * MCQ mode. MCQ mode may be used to increase performance.
>>+ */
>>+ UFSHCD_CAP_MCQ_EN = 1 << 12,
>> };
>
>I prefer that the above flag would only be introduced after a need
>appears to disable MCQ, e.g. discovery of a host controller that is
>too broken to enable MCQ.
>
I think this flag is useful during chip bring-ups &/or debugs.
Considering that this is a fairly new hardware block even though the HC supports
MCQ there could be times to keep it disabled.
>Since UFSHCI 4.0 controllers must support UFSHCI 3.0, shouldn't users
>have a way to disable MCQ, e.g. via a kernel module parameter?
>
I can add a kernel module parameter to disable MCQ.
I think adding it to host driver (e.g. ufs-qcom) would be good.
Please let me know if you have a better place in mind.
>Thanks,
>
>Bart.
next prev parent reply other threads:[~2022-10-28 16:51 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-20 18:03 [PATCH v3 00/17] Add Multi Circular Queue Support Asutosh Das
2022-10-20 18:03 ` [PATCH v3 01/17] ufs: core: Probe for ext_iid support Asutosh Das
2022-10-27 21:02 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 02/17] ufs: core: Optimize duplicate code to read extended feature Asutosh Das
2022-10-27 21:05 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 03/17] ufs: core: Introduce Multi-circular queue capability Asutosh Das
2022-10-27 21:09 ` Bart Van Assche
2022-10-28 16:51 ` Asutosh Das [this message]
2022-10-28 21:44 ` Bart Van Assche
2022-10-30 12:11 ` Avri Altman
2022-10-20 18:03 ` [PATCH v3 04/17] ufs: core: Defer adding host to scsi if mcq is supported Asutosh Das
2022-10-27 21:18 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 05/17] ufs: core: mcq: Introduce Multi Circular Queue Asutosh Das
2022-10-27 21:33 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 06/17] ufs: core: mcq: Configure resource regions Asutosh Das
2022-10-26 9:14 ` Eddie Huang
2022-10-20 18:03 ` [PATCH v3 07/17] ufs: core: mcq: Calculate queue depth Asutosh Das
2022-10-27 21:52 ` Bart Van Assche
2022-10-30 11:43 ` Avri Altman
2022-10-31 19:34 ` Asutosh Das
2022-10-31 19:24 ` Asutosh Das
2022-10-31 19:42 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 08/17] ufs: core: mcq: Allocate memory for mcq mode Asutosh Das
2022-10-27 21:38 ` Bart Van Assche
2022-10-30 12:28 ` Avri Altman
2022-10-31 19:39 ` Asutosh Das
2022-10-20 18:03 ` [PATCH v3 09/17] ufs: core: mcq: Configure operation and runtime interface Asutosh Das
2022-10-27 22:01 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 10/17] ufs: core: mcq: Use shared tags for MCQ mode Asutosh Das
2022-10-28 21:47 ` Bart Van Assche
2022-10-30 13:06 ` Avri Altman
2022-11-01 16:29 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 11/17] ufs: core: Prepare ufshcd_send_command for mcq Asutosh Das
2022-10-28 21:49 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 12/17] ufs: core: mcq: Find hardware queue to queue request Asutosh Das
2022-10-28 21:53 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 13/17] ufs: core: Prepare for completion in mcq Asutosh Das
2022-10-28 21:56 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 14/17] ufs: mcq: Add completion support of a cqe Asutosh Das
2022-10-28 22:05 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 15/17] ufs: core: mcq: Add completion support in poll Asutosh Das
2022-10-28 22:07 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 16/17] ufs: core: mcq: Enable Multi Circular Queue Asutosh Das
2022-10-28 22:07 ` Bart Van Assche
2022-10-20 18:03 ` [PATCH v3 17/17] ufs: qcom-host: Enable multi circular queue capability Asutosh Das
2022-10-28 22:08 ` Bart Van Assche
2022-11-01 18:47 ` Asutosh Das
2022-10-26 9:21 ` [PATCH v3 00/17] Add Multi Circular Queue Support Eddie Huang
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