linux-kernel - Re: [PATCH v4] scsi: libsas: Allocation SMP request is aligned to ARCH_DMA

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Date: Mon,  1 Apr 2024 21:48:37 -0400
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: john.g.garry@...cle.com, yanaijie@...wei.com, jejb@...ux.ibm.com,
        dlemoal@...nel.org, chenxiang66@...ilicon.com,
        Yihang Li <liyihang9@...wei.com>
Cc: "Martin K . Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxarm@...wei.com, prime.zeng@...wei.com, yangxingui@...wei.com
Subject: Re: [PATCH v4] scsi: libsas: Allocation SMP request is aligned to ARCH_DMA_MINALIGN

On Thu, 28 Mar 2024 17:06:26 +0800, Yihang Li wrote:

> This series [1] reducing the kmalloc() minimum alignment on arm64 to 8
> (from 128). In libsas, this will cause SMP requests to be 8-byte-aligned
> through kmalloc() allocation. However, for the hisi_sas hardware, all
> commands address must be 16-byte-aligned. Otherwise, the commands fail to
> be executed.
> 
> ARCH_DMA_MINALIGN represents the minimum (static) alignment for safe DMA
> operations, so use ARCH_DMA_MINALIGN as the alignment for SMP request.
> 
> [...]

Applied to 6.9/scsi-fixes, thanks!

[1/1] scsi: libsas: Allocation SMP request is aligned to ARCH_DMA_MINALIGN
      https://git.kernel.org/mkp/scsi/c/e675a4fd6d1f

-- 
Martin K. Petersen	Oracle Linux Engineering