linux-kernel - Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits

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Message-ID: <bccbcc9b-4750-a1a7-130f-69eeea5dcb23@acm.org>
Date:   Wed, 8 Jun 2022 14:07:05 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     John Garry <john.garry@...wei.com>,
        damien.lemoal@...nsource.wdc.com, joro@...tes.org, will@...nel.org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-ide@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-scsi@...r.kernel.org, liyihang6@...ilicon.com,
        chenxiang66@...ilicon.com, thunder.leizhen@...wei.com
Subject: Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA
 optimum mapping limits

On 6/8/22 10:50, John Garry wrote:
> Please note that this limit only applies if we have an IOMMU enabled for 
> the scsi host dma device. Otherwise we are limited by dma direct or 
> swiotlb max mapping size, as before.

SCSI host bus adapters that support 64-bit DMA may support much larger 
transfer sizes than 128 KiB.

Thanks,

Bart.