linux-kernel - Re: [PATCH] scsi: hisi_sas: Limit max hw sectors for v3 HW

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Message-Id: <165638664146.7677.5674015792755876546.b4-ty@oracle.com>
Date:   Mon, 27 Jun 2022 23:24:07 -0400
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     jejb@...ux.ibm.com, John Garry <john.garry@...wei.com>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>, hch@....de,
        linux-scsi@...r.kernel.org, linuxarm@...wei.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: hisi_sas: Limit max hw sectors for v3 HW

On Thu, 23 Jun 2022 20:41:59 +0800, John Garry wrote:

> If the controller is behind an IOMMU then the IOMMU IOVA caching range can
> affect performance, as discussed in [0].
> 
> Limit the max HW sectors to not exceed this limit. We need to hardcode
> the value until a proper DMA mapping API is available.
> 
> [0] https://lore.kernel.org/linux-iommu/20210129092120.1482-1-thunder.leizhen@huawei.com/
> 
> [...]

Applied to 5.19/scsi-fixes, thanks!

[1/1] scsi: hisi_sas: Limit max hw sectors for v3 HW
      https://git.kernel.org/mkp/scsi/c/fce54ed02757

-- 
Martin K. Petersen	Oracle Linux Engineering