linux-kernel - Re: [PATCH v3 01/21] iommu: Add iommu_paging_domain

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Message-ID: <20240619142050.GG791043@ziepe.ca>
Date: Wed, 19 Jun 2024 11:20:50 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Kalle Valo <kvalo@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>,
	Alex Williamson <alex.williamson@...hat.com>, mst@...hat.com,
	Jason Wang <jasowang@...hat.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Jonathan Hunter <jonathanh@...dia.com>,
	Mikko Perttunen <mperttunen@...dia.com>,
	Jeff Johnson <quic_jjohnson@...cinc.com>,
	ath10k@...ts.infradead.org, ath11k@...ts.infradead.org,
	iommu@...ts.linux.dev, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 01/21] iommu: Add iommu_paging_domain_alloc() interface

On Mon, Jun 10, 2024 at 04:55:35PM +0800, Lu Baolu wrote:
> Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from
> bus. The iommu subsystem no longer relies on bus for operations. So the
> bus parameter in iommu_domain_alloc() is no longer relevant.
> 
> Add a new interface named iommu_paging_domain_alloc(), which explicitly
> indicates the allocation of a paging domain for DMA managed by a kernel
> driver. The new interface takes a device pointer as its parameter, that
> better aligns with the current iommu subsystem.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  include/linux/iommu.h |  6 ++++++
>  drivers/iommu/iommu.c | 20 ++++++++++++++++++++
>  2 files changed, 26 insertions(+)

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

Jason