linux-kernel - Re: [PATCH v35 3/4] scsi: ufs: Prepare HPB read for cached sub-region

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Message-ID: <12392bef-e018-8260-5279-16b7b43f5a8f@acm.org>
Date:   Thu, 3 Jun 2021 13:12:26 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     daejun7.park@...sung.com, Greg KH <gregkh@...uxfoundation.org>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "asutoshd@...eaurora.org" <asutoshd@...eaurora.org>,
        "stanley.chu@...iatek.com" <stanley.chu@...iatek.com>,
        "cang@...eaurora.org" <cang@...eaurora.org>,
        "huobean@...il.com" <huobean@...il.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        JinHwan Park <jh.i.park@...sung.com>,
        Javier Gonzalez <javier.gonz@...sung.com>,
        Sung-Jun Park <sungjun07.park@...sung.com>,
        Jinyoung CHOI <j-young.choi@...sung.com>,
        Dukhyun Kwon <d_hyun.kwon@...sung.com>,
        Keoseong Park <keosung.park@...sung.com>,
        Jaemyung Lee <jaemyung.lee@...sung.com>,
        Jieon Seol <jieon.seol@...sung.com>
Subject: Re: [PATCH v35 3/4] scsi: ufs: Prepare HPB read for cached sub-region

On 5/24/21 1:45 AM, Daejun Park wrote:
> +static void
> +ufshpb_set_hpb_read_to_upiu(struct ufshpb_lu *hpb, struct ufshcd_lrb *lrbp,
> +			    u32 lpn, u64 ppn, u8 transfer_len)
> +{
> +	unsigned char *cdb = lrbp->cmd->cmnd;
> +
> +	cdb[0] = UFSHPB_READ;
> +
> +	/* ppn value is stored as big-endian in the host memory */

I think that that comment means that the type of the 'ppn' argument
should be changed from 'u64' into __be64.

> +	memcpy(&cdb[6], &ppn, sizeof(__be64));
> +	cdb[14] = transfer_len;
> +
> +	lrbp->cmd->cmd_len = UFS_CDB_SIZE;
> +}
> +
> +/*
> + * This function will set up HPB read command using host-side L2P map data.
> + * In HPB v1.0, maximum size of HPB read command is 4KB.
> + */
> +void ufshpb_prep(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
> +{
[ ... ]
> +
> +	ufshpb_set_hpb_read_to_upiu(hpb, lrbp, lpn, ppn, transfer_len);

'transfer_len' has type int and is truncated to type 'u8' when passed as
an argument to ufshpb_set_hpb_read_to_upiu(). Please handle transfer_len
values >= 256 properly.

Thanks,

Bart.