linux-kernel - Re: [PATCH 0/1] swiotlb: Make IO_TLB

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Message-ID: <fc2e30eb-2ec7-4795-a2a4-077b7fde7fd5@samsung.com>
Date: Tue, 22 Apr 2025 15:36:15 +0200
From: Marek Szyprowski <m.szyprowski@...sung.com>
To: huaqian.li@...mens.com, robin.murphy@....com
Cc: baocheng.su@...mens.com, jan.kiszka@...mens.com, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/1] swiotlb: Make IO_TLB_SEGSIZE Configurable

On 22.04.2025 08:37, huaqian.li@...mens.com wrote:
> From: Li Hua Qian <huaqian.li@...mens.com>
>
> This patchset introduces a change to make the IO_TLB_SEGSIZE parameter
> configurable via a new kernel configuration option (CONFIG_SWIOTLB_SEGSIZE).
>
> In certain applications, the default value of IO_TLB_SEGSIZE (128) may
> not be sufficient for memory allocation, leading to runtime errors. By
> making this parameter configurable, users can adjust the segment size to
> better suit their specific use cases, improving flexibility and system
> stability.

Could You elaborate a bit more what are those certain applications that 
require increasing IO_TLB_SEGSIZE? I'm not against it, but such change 
should be well justified and described, while the above cover-letter 
doesn't provide anything more than is written in the patch description.


> Li Hua Qian (1):
>    swiotlb: Make IO_TLB_SEGSIZE configurable
>
>   include/linux/swiotlb.h | 2 +-
>   kernel/dma/Kconfig      | 7 +++++++
>   2 files changed, 8 insertions(+), 1 deletion(-)
>
Best regards
-- 
Marek Szyprowski, PhD
Samsung R&D Institute Poland