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From: Will Deacon <will@kernel.org>
To: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Rob Clark <robdclark@chromium.org>,
	linux-arm-msm@vger.kernel.org, iommu@lists.linux-foundation.org,
	linux-kernel@vger.kernel.org, Sibi Sankar <sibis@codeaurora.org>,
	Robin Murphy <robin.murphy@arm.com>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings
Date: Mon, 21 Sep 2020 22:08:15 +0100	[thread overview]
Message-ID: <20200921210814.GE3811@willie-the-truck> (raw)
In-Reply-To: <20200913032559.GT3715@yoga>

On Sat, Sep 12, 2020 at 10:25:59PM -0500, Bjorn Andersson wrote:
> On Fri 11 Sep 12:13 CDT 2020, Robin Murphy wrote:
> > On 2020-09-04 16:55, Bjorn Andersson wrote:
> > > Add a new operation to allow platform implementations to inherit any
> > > stream mappings from the boot loader.
> > 
> > Is there a reason we need an explicit step for this? The aim of the
> > cfg_probe hook is that the SMMU software state should all be set up by then,
> > and you can mess about with it however you like before arm_smmu_reset()
> > actually commits anything to hardware. I would have thought you could
> > permanently steal a context bank, configure it as your bypass hole, read out
> > the previous SME configuration and tweak smmu->smrs and smmu->s2crs
> > appropriately all together "invisibly" at that point.
> 
> I did this because as of 6a79a5a3842b ("iommu/arm-smmu: Call
> configuration impl hook before consuming features") we no longer have
> setup pgsize_bitmap as we hit cfg_probe, which means that I need to
> replicate this logic to set up the iommu_domain.
> 
> If I avoid setting up an iommu_domain for the identity context, as you
> request in patch 8, this shouldn't be needed anymore.
> 
> > If that can't work, I'm very curious as to what I've overlooked.
> > 
> 
> I believe that will work, I will rework the patches and try it out.

Did you get a chance to rework this?

Will
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  reply	other threads:[~2020-09-21 21:08 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-04 15:55 [PATCH v3 0/8] iommu/arm-smmu: Support maintaining bootloader mappings Bjorn Andersson
2020-09-04 15:55 ` [PATCH v3 1/8] iommu/arm-smmu: Refactor context bank allocation Bjorn Andersson
2020-09-08 18:42   ` Jordan Crouse
2020-09-08 18:46     ` Jordan Crouse
2020-09-11  8:18   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 2/8] iommu/arm-smmu: Delay modifying domain during init Bjorn Andersson
2020-09-11  8:20   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 3/8] iommu/arm-smmu: Consult context bank allocator for identify domains Bjorn Andersson
2020-09-11  8:21   ` Sai Prakash Ranjan
2020-09-11  8:24   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 4/8] iommu/arm-smmu-qcom: Emulate bypass by using context banks Bjorn Andersson
2020-09-11  8:25   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 5/8] iommu/arm-smmu-qcom: Consistently initialize stream mappings Bjorn Andersson
2020-09-11  8:26   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 6/8] iommu/arm-smmu: Add impl hook for inherit boot mappings Bjorn Andersson
2020-09-11  8:27   ` Sai Prakash Ranjan
2020-09-11 17:13   ` Robin Murphy
2020-09-13  3:25     ` Bjorn Andersson
2020-09-21 21:08       ` Will Deacon [this message]
2020-09-24 15:55         ` Bjorn Andersson
2020-10-12  7:31         ` Bjorn Andersson
2020-10-13 16:47           ` Robin Murphy
2020-09-04 15:55 ` [PATCH v3 7/8] iommu/arm-smmu: Provide helper for allocating identity domain Bjorn Andersson
2020-09-11  8:28   ` Sai Prakash Ranjan
2020-09-04 15:55 ` [PATCH v3 8/8] iommu/arm-smmu-qcom: Setup identity domain for boot mappings Bjorn Andersson
2020-09-11  8:29   ` Sai Prakash Ranjan
2020-09-11 17:29   ` Robin Murphy
2020-09-05 22:27 ` [PATCH v3 0/8] iommu/arm-smmu: Support maintaining bootloader mappings Rob Clark
2020-09-09 14:46 ` Laurentiu Tudor
2020-09-10 22:56 ` John Stultz
2020-09-11  8:16 ` Sai Prakash Ranjan
2020-09-11 16:10 ` Amit Pundir
2020-09-16 10:09 ` Laurentiu Tudor

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