linux-kernel - Re: [PATCH v4 1/1] scsi: ufs: core: add device level exception support

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Message-ID: <989e695e-e6a4-4427-9041-e39ecf5b5674@acm.org>
Date: Fri, 28 Mar 2025 07:02:20 -0700
From: Bart Van Assche <bvanassche@....org>
To: "Bao D. Nguyen" <quic_nguyenb@...cinc.com>,
 Arthur Simchaev <Arthur.Simchaev@...disk.com>,
 "quic_cang@...cinc.com" <quic_cang@...cinc.com>,
 "quic_nitirawa@...cinc.com" <quic_nitirawa@...cinc.com>,
 "avri.altman@....com" <avri.altman@....com>,
 "peter.wang@...iatek.com" <peter.wang@...iatek.com>,
 "manivannan.sadhasivam@...aro.org" <manivannan.sadhasivam@...aro.org>,
 "minwoo.im@...sung.com" <minwoo.im@...sung.com>,
 "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
 "martin.petersen@...cle.com" <martin.petersen@...cle.com>
Cc: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
 Alim Akhtar <alim.akhtar@...sung.com>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Bean Huo <beanhuo@...ron.com>, Keoseong Park <keosung.park@...sung.com>,
 Ziqi Chen <quic_ziqichen@...cinc.com>, Al Viro <viro@...iv.linux.org.uk>,
 Gwendal Grignou <gwendal@...omium.org>, Eric Biggers <ebiggers@...gle.com>,
 open list <linux-kernel@...r.kernel.org>,
 "moderated list:ARM/Mediatek SoC support:Keyword:mediatek"
 <linux-arm-kernel@...ts.infradead.org>,
 "moderated list:ARM/Mediatek SoC support:Keyword:mediatek"
 <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v4 1/1] scsi: ufs: core: add device level exception
 support

On 3/27/25 5:45 PM, Bao D. Nguyen wrote:
> Thanks Bart. How about we change the current utp_upiu_query_v4_0 to
> 
> struct utp_upiu_query_v4_0 {
>          __u8 opcode;
>          __u8 idn;
>          __u8 index;
>          __u8 selector;
>          __u8 cmd_specifics[8];
>          /* private: */
>          __be32 reserved;
> };
> 
> Depending on the opcode/transaction, the cmd_specifics[] can be type 
> casted to access the LENGTH, FLAG_VALUE, VALUE[0:63] fields of the QUERY 
> UPIU. The __u8 array[8] would also prevent the compiler padding to the 
> data.

Are there any user space applications that use the osf3/4/5/6/7 member
names? Has it been considered to preserve these by introducing a union?

Thanks,

Bart.