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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 v4 4/5] dma: swiotlb: Add an overridable architecture pool opt-out
Date: Thu, 17 Sep 2026 17:05:53 +0100	[thread overview]
Message-ID: <aqwP4ZKugUpFezV7@arm.com> (raw)
In-Reply-To: <20260914070135.313337-5-aneesh.kumar@kernel.org>

On Mon, Sep 14, 2026 at 12:31:33PM +0530, Aneesh Kumar K.V (Arm) wrote:
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index be3962a33fc6..ef7a776ee508 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -20,6 +20,8 @@ struct scatterlist;
>  #define SWIOTLB_INIT_ADDRESSING_LIMIT	(1 << 2)
>  /* Initialize a default-sized pool that requires architecture remapping. */
>  #define SWIOTLB_INIT_REMAP		(1 << 3)
> +/* Do not initialize a pool unless SWIOTLB is explicitly required. */
> +#define SWIOTLB_INIT_FORCE_DISABLE	(1 << 4)

Nit: maybe better as SWIOTLB_INIT_DEFAULT_OFF. "Force" sounds too
drastic and it can be overridden on the command line to re-enable.

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 v4 4/5] dma: swiotlb: Add an overridable architecture pool opt-out
Date: Thu, 17 Sep 2026 17:05:53 +0100	[thread overview]
Message-ID: <aqwP4ZKugUpFezV7@arm.com> (raw)
In-Reply-To: <20260914070135.313337-5-aneesh.kumar@kernel.org>

On Mon, Sep 14, 2026 at 12:31:33PM +0530, Aneesh Kumar K.V (Arm) wrote:
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index be3962a33fc6..ef7a776ee508 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -20,6 +20,8 @@ struct scatterlist;
>  #define SWIOTLB_INIT_ADDRESSING_LIMIT	(1 << 2)
>  /* Initialize a default-sized pool that requires architecture remapping. */
>  #define SWIOTLB_INIT_REMAP		(1 << 3)
> +/* Do not initialize a pool unless SWIOTLB is explicitly required. */
> +#define SWIOTLB_INIT_FORCE_DISABLE	(1 << 4)

Nit: maybe better as SWIOTLB_INIT_DEFAULT_OFF. "Force" sounds too
drastic and it can be overridden on the command line to re-enable.

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

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

  parent reply	other threads:[~2026-09-17 16:06 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-14  7:01 [PATCH v4 0/5] dma: swiotlb: Centralize default pool policy and sizing Aneesh Kumar K.V (Arm)
2026-09-14  7:01 ` Aneesh Kumar K.V (Arm)
2026-09-14  7:01 ` [PATCH v4 1/5] dma: swiotlb: Centralize default pool policy selection Aneesh Kumar K.V (Arm)
2026-09-14  7:01   ` Aneesh Kumar K.V (Arm)
2026-09-14  7:24   ` sashiko-bot
2026-09-17 14:47   ` Catalin Marinas
2026-09-17 14:47     ` Catalin Marinas
2026-09-14  7:01 ` [PATCH v4 2/5] dma: swiotlb: Centralize minimal pool sizing Aneesh Kumar K.V (Arm)
2026-09-14  7:01   ` Aneesh Kumar K.V (Arm)
2026-09-14  7:34   ` sashiko-bot
2026-09-17 15:47   ` Catalin Marinas
2026-09-17 15:47     ` Catalin Marinas
2026-09-18  7:05     ` Aneesh Kumar K.V
2026-09-18  7:05       ` Aneesh Kumar K.V
2026-09-14  7:01 ` [PATCH v4 3/5] dma: swiotlb: Centralize memory-encryption " Aneesh Kumar K.V (Arm)
2026-09-14  7:01   ` Aneesh Kumar K.V (Arm)
2026-09-14  7:41   ` sashiko-bot
2026-09-17 16:02   ` Catalin Marinas
2026-09-17 16:02     ` Catalin Marinas
2026-09-18  7:13     ` Aneesh Kumar K.V
2026-09-18  7:13       ` Aneesh Kumar K.V
2026-09-14  7:01 ` [PATCH v4 4/5] dma: swiotlb: Add an overridable architecture pool opt-out Aneesh Kumar K.V (Arm)
2026-09-14  7:01   ` Aneesh Kumar K.V (Arm)
2026-09-14  7:50   ` sashiko-bot
2026-09-17 16:05   ` Catalin Marinas [this message]
2026-09-17 16:05     ` Catalin Marinas
2026-09-14  7:01 ` [PATCH v4 5/5] dma: swiotlb: Remove SWIOTLB_ANY Aneesh Kumar K.V (Arm)
2026-09-14  7:01   ` Aneesh Kumar K.V (Arm)
2026-09-14  7:59   ` sashiko-bot
2026-09-15  8:46     ` Aneesh Kumar K.V
2026-09-17 16:08   ` Catalin Marinas
2026-09-17 16:08     ` Catalin Marinas

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