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

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Message-ID: <ZBnBU9OU4iV6CV0W@ziepe.ca>
Date:   Tue, 21 Mar 2023 11:38:11 -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,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: Re: [PATCH] iommu/rockchip: Add missing set_platform_dma_ops callback

On Wed, Mar 15, 2023 at 04:41:52PM +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).
> 
> Fixes: c1fe9119ee70 ("iommu: Add set_platform_dma_ops callbacks")
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> This fixes a splat I was seeing on a Firefly-RK3288, more details here:
> https://lore.kernel.org/all/26a5d1b8-40b3-b1e4-bc85-740409c26838@arm.com/

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

Do you know what state the iommu is left in after
rk_iommu_detach_device()? Ie is it blocking DMA or doing identity or
something else?

Jason