linux-kernel - Re: [PATCH 0/5] iommu/arm-smmu: Support maintaining bootloader mappings

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Message-ID: <20200709073330.GI34333@vkoul-mobl>
Date:   Thu, 9 Jul 2020 13:03:30 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jonathan Marek <jonathan@...ek.ca>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 0/5] iommu/arm-smmu: Support maintaining bootloader
 mappings

On 08-07-20, 22:01, Bjorn Andersson wrote:
> Based on previous attempts and discussions this is the latest attempt at
> inheriting stream mappings set up by the bootloader, for e.g. boot splash or
> efifb.
> 
> The first patch is an implementation of Robin's suggestion that we should just
> mark the relevant stream mappings as BYPASS. Relying on something else to set
> up the stream mappings wanted - e.g. by reading it back in platform specific
> implementation code.
> 
> The series then tackles the problem seen in most versions of Qualcomm firmware,
> that the hypervisor intercepts BYPASS writes and turn them into FAULTs. It does
> this by allocating context banks for identity domains as well, with translation
> disabled.
> 
> Lastly it amends the stream mapping initialization code to allocate a specific
> identity domain that is used for any mappings inherited from the bootloader, if
> above Qualcomm quirk is required.
> 
> 
> The series has been tested and shown to allow booting SDM845, SDM850, SM8150,
> SM8250 with boot splash screen setup by the bootloader. Specifically it also
> allows the Lenovo Yoga C630 to boot with SMMU and efifb enabled.

This resolves issue on RB3 for me so:

Tested-by: Vinod Koul <vkoul@...nel.org>

-- 
~Vinod