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

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To: John Garry <john.garry@xxxxxxxxxx>, damien.lemoal@xxxxxxxxxxxxxxxxxx, joro@xxxxxxxxxx, will@xxxxxxxxxx, jejb@xxxxxxxxxxxxx, martin.petersen@xxxxxxxxxx, hch@xxxxxx, m.szyprowski@xxxxxxxxxxx, robin.murphy@xxxxxxx
Subject: Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits
From: Bart Van Assche <bvanassche@xxxxxxx>
Date: Wed, 8 Jun 2022 14:07:05 -0700
Cc: linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-ide@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-scsi@xxxxxxxxxxxxxxx, liyihang6@xxxxxxxxxxxxx, chenxiang66@xxxxxxxxxxxxx, thunder.leizhen@xxxxxxxxxx
In-reply-to: <31417477-953d-283e-808e-cf8701e820a8@huawei.com>
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On 6/8/22 10:50, John Garry wrote:

Please note that this limit only applies if we have an IOMMU enabled forthe scsi host dma device. Otherwise we are limited by dma direct orswiotlb max mapping size, as before.

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


Thanks,

Bart.

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References:
- [PATCH v3 0/4] DMA mapping changes for SCSI core
  - From: John Garry
- [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits
  - From: John Garry
- Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits
  - From: Bart Van Assche
- Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits
  - From: John Garry

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