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Subject: RE: Re: [PATCH v35 3/4] scsi: ufs: Prepare HPB read for cached
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From:   Daejun Park <daejun7.park@samsung.com>
To:     Bart Van Assche <bvanassche@acm.org>,
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        JinHwan Park <jh.i.park@samsung.com>,
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Message-ID: <20210604040636epcms2p7bcf940a2cd060336f79250de0060e08c@epcms2p7>
Date:   Fri, 04 Jun 2021 13:06:36 +0900
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References: <4bf317c8-4c74-2207-95e2-34c59b14c454@acm.org>
        <12392bef-e018-8260-5279-16b7b43f5a8f@acm.org>
        <20210524084345epcms2p63dde85f3fdc127c29d25ada7d7f539cb@epcms2p6>
        <20210524084546epcms2p2c91dc1df482fd593307892825532c6dd@epcms2p2>
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        <CGME20210524084345epcms2p63dde85f3fdc127c29d25ada7d7f539cb@epcms2p7>
Precedence: bulk

>>> +/*
>>>> + * 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.
>> 
>> Before entering the function, ufshpb_is_supported_chunk() checks whether
>> transfer_len <= hpb->pre_req_max_tr_len which is set to
>> HPB_MULTI_CHUNK_HIGH (128) on initalization.
> 
>How about adding a WARN_ON_ONCE() in ufshpb_prep() that verifies that
>transfer_len is <= HPB_MULTI_CHUNK_HIGH?

Sure, I will add WARN_ON_ONCE() just after calling ufshpb_is_supported_chunk().

Thanks

> 
>Thanks,
> 
>Bart.
> 
> 
>