linux-kernel - Re: [PATCH v2] iommu/rockchip: Add missing set_platform_dma

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Date:   Wed, 29 Mar 2023 20:42:00 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Steven Price <steven.price@....com>
Cc:     Heiko Stuebner <heiko@...ech.de>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v2] iommu/rockchip: Add missing set_platform_dma_ops
 callback

On Fri, Mar 24, 2023 at 11:11:27AM +0000, Steven Price wrote:
> Similar to exynos, we need a set_platform_dma_ops() callback for proper
> operation on ARM 32 bit after recent changes in the IOMMU framework
> (detach ops removal). But also the use of a NULL domain is confusing.
> 
> Rework the code to have a singleton rk_identity_domain which is assigned
> to domain when using an identity mapping rather than "detaching". This
> makes the code easier to reason about.
> 
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v1[1]:
> 
>  * Reworked the code to avoid a NULL domain, instead a singleton
>    rk_identity_domain is used instead. The 'detach' language is no
>    longer used.
> 
> [1] https://lore.kernel.org/r/20230315164152.333251-1-steven.price%40arm.com
> 
>  drivers/iommu/rockchip-iommu.c | 50 ++++++++++++++++++++++++++--------
>  1 file changed, 39 insertions(+), 11 deletions(-)

Aside from the pm stuff this looks OK to me

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

Thanks,
Jason