From: sashiko-bot@kernel.org
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
Cc: "Vasily Gorbik" <gor@linux.ibm.com>,
"Alexander Gordeev" <agordeev@linux.ibm.com>,
linux-s390@vger.kernel.org, "Heiko Carstens" <hca@linux.ibm.com>,
"Christian Borntraeger" <borntraeger@linux.ibm.com>
Subject: Re: [PATCH v3 2/4] dma: swiotlb: Centralize minimal pool sizing
Date: Fri, 04 Sep 2026 10:31:50 +0000 [thread overview]
Message-ID: <20260904103151.64C6B1F00A3D@smtp.kernel.org> (raw)
In-Reply-To: <20260904101810.1193505-3-aneesh.kumar@kernel.org>
> A default SWIOTLB pool used only for unaligned kmalloc bouncing can be
> smaller than one required for limited DMA addressing. Arm64 and RISC-V
> currently implement this sizing independently, using 1 MiB of SWIOTLB
> space per GiB of RAM.
>
> The SWIOTLB core now identifies this case with SWIOTLB_POOL_MINIMAL.
> Size that policy in swiotlb_adjust_pool_size() and remove the
> architecture-specific adjustments.
>
> Explicit swiotlb= sizing remains unchanged because swiotlb_adjust_size()
> preserves a user-configured size.
>
> NOTE: We lose the RISC-V SWIOTLB_ANY setting in this patch. It will be
> reinstated in a follow-up patch where we make SWIOTLB_ANY redundant.
>
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.dev/#/patchset/20260904101810.1193505-1-aneesh.kumar@kernel.org?part=2
next prev parent reply other threads:[~2026-09-04 10:31 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-04 10:18 [PATCH v3 0/4] dma: swiotlb: Centralize default pool policy and sizing Aneesh Kumar K.V (Arm)
2026-09-04 10:18 ` Aneesh Kumar K.V (Arm)
2026-09-04 10:18 ` [PATCH v3 1/4] dma: swiotlb: Centralize default pool policy selection Aneesh Kumar K.V (Arm)
2026-09-04 10:18 ` Aneesh Kumar K.V (Arm)
2026-09-04 10:40 ` sashiko-bot
2026-09-04 10:18 ` [PATCH v3 2/4] dma: swiotlb: Centralize minimal pool sizing Aneesh Kumar K.V (Arm)
2026-09-04 10:18 ` Aneesh Kumar K.V (Arm)
2026-09-04 10:31 ` sashiko-bot [this message]
2026-09-04 10:18 ` [PATCH v3 3/4] dma: swiotlb: Centralize memory-encryption " Aneesh Kumar K.V (Arm)
2026-09-04 10:18 ` Aneesh Kumar K.V (Arm)
2026-09-04 10:36 ` sashiko-bot
2026-09-09 9:28 ` Aneesh Kumar K.V
2026-09-04 10:18 ` [PATCH v3 4/4] dma: swiotlb: Remove SWIOTLB_ANY Aneesh Kumar K.V (Arm)
2026-09-04 10:18 ` Aneesh Kumar K.V (Arm)
2026-09-04 10:35 ` sashiko-bot
2026-09-09 6:28 ` Aneesh Kumar K.V
2026-09-09 6:31 ` Aneesh Kumar K.V
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