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From: Catalin Marinas <catalin.marinas@arm.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	Robin Murphy <robin.murphy@arm.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Steven Price <steven.price@arm.com>,
	Suzuki K Poulose <Suzuki.Poulose@arm.com>,
	Jiri Pirko <jiri@resnulli.us>, Jason Gunthorpe <jgg@ziepe.ca>,
	Mostafa Saleh <smostafa@google.com>,
	Petr Tesarik <ptesarik@suse.com>,
	Alexey Kardashevskiy <aik@amd.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Xu Yilun <yilun.xu@linux.intel.com>,
	Madhavan Srinivasan <maddy@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Russell King <linux@armlinux.org.uk>,
	Huacai Chen <chenhuacai@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
	linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
	x86@kernel.org
Subject: Re: [PATCH v5 3/6] dma: swiotlb: Centralize minimal pool sizing
Date: Mon, 21 Sep 2026 13:52:28 +0100	[thread overview]
Message-ID: <arEojDWvwtMZnmBx@arm.com> (raw)
In-Reply-To: <20260921063628.362078-4-aneesh.kumar@kernel.org>

On Mon, Sep 21, 2026 at 12:06:25PM +0530, Aneesh Kumar K.V (Arm) wrote:
> 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.
> 
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: "Aneesh Kumar K.V (Arm)" <aneesh.kumar@kernel.org>
Cc: iommu@lists.linux.dev, linux-kernel@vger.kernel.org,
	Robin Murphy <robin.murphy@arm.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Steven Price <steven.price@arm.com>,
	Suzuki K Poulose <Suzuki.Poulose@arm.com>,
	Jiri Pirko <jiri@resnulli.us>, Jason Gunthorpe <jgg@ziepe.ca>,
	Mostafa Saleh <smostafa@google.com>,
	Petr Tesarik <ptesarik@suse.com>,
	Alexey Kardashevskiy <aik@amd.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Xu Yilun <yilun.xu@linux.intel.com>,
	Madhavan Srinivasan <maddy@linux.ibm.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	"Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
	Alexander Gordeev <agordeev@linux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
	Heiko Carstens <hca@linux.ibm.com>,
	Vasily Gorbik <gor@linux.ibm.com>,
	Christian Borntraeger <borntraeger@linux.ibm.com>,
	Sven Schnelle <svens@linux.ibm.com>,
	Russell King <linux@armlinux.org.uk>,
	Huacai Chen <chenhuacai@kernel.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	Jiaxun Yang <jiaxun.yang@flygoat.com>,
	Paul Walmsley <pjw@kernel.org>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	linux-arm-kernel@lists.infradead.org, loongarch@lists.linux.dev,
	linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
	x86@kernel.org
Subject: Re: [PATCH v5 3/6] dma: swiotlb: Centralize minimal pool sizing
Date: Mon, 21 Sep 2026 13:52:28 +0100	[thread overview]
Message-ID: <arEojDWvwtMZnmBx@arm.com> (raw)
In-Reply-To: <20260921063628.362078-4-aneesh.kumar@kernel.org>

On Mon, Sep 21, 2026 at 12:06:25PM +0530, Aneesh Kumar K.V (Arm) wrote:
> 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.
> 
> Signed-off-by: Aneesh Kumar K.V (Arm) <aneesh.kumar@kernel.org>

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>

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linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

  parent reply	other threads:[~2026-09-21 12:52 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-21  6:36 [PATCH v5 0/6] dma: swiotlb: Centralize default pool policy and sizing Aneesh Kumar K.V (Arm)
2026-09-21  6:36 ` Aneesh Kumar K.V (Arm)
2026-09-21  6:36 ` [PATCH v5 1/6] dma: swiotlb: Centralize default pool policy selection Aneesh Kumar K.V (Arm)
2026-09-21  6:36   ` Aneesh Kumar K.V (Arm)
2026-09-21  6:56   ` sashiko-bot
2026-09-21 15:25   ` Robin Murphy
2026-09-21 15:25     ` Robin Murphy
2026-09-22  5:32     ` Aneesh Kumar K.V
2026-09-22  5:32       ` Aneesh Kumar K.V
2026-09-21  6:36 ` [PATCH v5 2/6] dma: swiotlb: Track whether the pool size was explicitly set Aneesh Kumar K.V (Arm)
2026-09-21  6:36   ` Aneesh Kumar K.V (Arm)
2026-09-21  6:44   ` sashiko-bot
2026-09-21 12:50   ` Catalin Marinas
2026-09-21 12:50     ` Catalin Marinas
2026-09-21 15:45   ` Robin Murphy
2026-09-21 15:45     ` Robin Murphy
2026-09-22  5:42     ` Aneesh Kumar K.V
2026-09-22  5:42       ` Aneesh Kumar K.V
2026-09-21  6:36 ` [PATCH v5 3/6] dma: swiotlb: Centralize minimal pool sizing Aneesh Kumar K.V (Arm)
2026-09-21  6:36   ` Aneesh Kumar K.V (Arm)
2026-09-21  6:45   ` sashiko-bot
2026-09-21 12:52   ` Catalin Marinas [this message]
2026-09-21 12:52     ` Catalin Marinas
2026-09-21 16:49   ` Robin Murphy
2026-09-21 16:49     ` Robin Murphy
2026-09-22  6:56     ` Aneesh Kumar K.V
2026-09-22  6:56       ` Aneesh Kumar K.V
2026-09-21  6:36 ` [PATCH v5 4/6] dma: swiotlb: Centralize memory-encryption " Aneesh Kumar K.V (Arm)
2026-09-21  6:36   ` Aneesh Kumar K.V (Arm)
2026-09-21  6:52   ` sashiko-bot
2026-09-22  7:02     ` Aneesh Kumar K.V
2026-09-23 12:47   ` Robin Murphy
2026-09-23 12:47     ` Robin Murphy
2026-09-23 14:28     ` Aneesh Kumar K.V
2026-09-23 14:28       ` Aneesh Kumar K.V
2026-09-21  6:36 ` [PATCH v5 5/6] dma: swiotlb: Add an overridable architecture pool opt-out Aneesh Kumar K.V (Arm)
2026-09-21  6:36   ` Aneesh Kumar K.V (Arm)
2026-09-21  6:51   ` sashiko-bot
2026-09-22  7:04     ` Aneesh Kumar K.V
2026-09-23 13:04   ` Robin Murphy
2026-09-23 13:04     ` Robin Murphy
2026-09-23 14:18     ` Aneesh Kumar K.V
2026-09-23 14:18       ` Aneesh Kumar K.V
2026-09-21  6:36 ` [PATCH v5 6/6] dma: swiotlb: Remove SWIOTLB_ANY Aneesh Kumar K.V (Arm)
2026-09-21  6:36   ` Aneesh Kumar K.V (Arm)
2026-09-21  6:48   ` sashiko-bot
2026-09-23 13:12   ` Robin Murphy
2026-09-23 13:12     ` Robin Murphy

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