linux-kernel - Re: [PATCH v7 2/5] iommu: Tidy domain for iommu_setup_dma

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Message-ID: <20251125191942.GD520526@nvidia.com>
Date: Tue, 25 Nov 2025 15:19:42 -0400
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: joro@...tes.org, afael@...nel.org, bhelgaas@...gle.com,
	alex@...zbot.org, will@...nel.org, robin.murphy@....com,
	lenb@...nel.org, kevin.tian@...el.com, baolu.lu@...ux.intel.com,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, kvm@...r.kernel.org,
	patches@...ts.linux.dev, pjaroszynski@...dia.com, vsethi@...dia.com,
	helgaas@...nel.org, etzhao1900@...il.com
Subject: Re: [PATCH v7 2/5] iommu: Tidy domain for iommu_setup_dma_ops()

On Fri, Nov 21, 2025 at 05:57:29PM -0800, Nicolin Chen wrote:
> This function can only be called on the default_domain. Trivally pass it
> in. In all three existing cases, the default domain was just attached to
> the device.
> 
> This avoids iommu_setup_dma_ops() calling iommu_get_domain_for_dev() that
> will be used by external callers.
> 
> Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> Reviewed-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
>  drivers/iommu/dma-iommu.h | 5 +++--
>  drivers/iommu/dma-iommu.c | 4 +---
>  drivers/iommu/iommu.c     | 6 +++---
>  3 files changed, 7 insertions(+), 8 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason