linux-kernel - Re: [PATCH 6/6] remoteproc: qcom: Enable map/unmap and SHM bridge support

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Message-ID: <345b1aa7-1cd5-45b9-9699-d77a83d6760d@oss.qualcomm.com>
Date: Fri, 25 Oct 2024 21:07:34 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Mukesh Ojha <quic_mojha@...cinc.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] remoteproc: qcom: Enable map/unmap and SHM bridge
 support

On 4.10.2024 11:23 PM, Mukesh Ojha wrote:
> For Qualcomm SoCs runnning with Qualcomm EL2 hypervisor(QHEE), IOMMU
> translation for remote processors is managed by QHEE and if the same SoC
> run under KVM, remoteproc carveout and devmem region should be IOMMU
> mapped from Linux PAS driver before remoteproc is brought up and
> unmapped once it is tear down and apart from this, SHM bridge also need
> to set up to enable memory protection on both remoteproc meta data
> memory as well as for the carveout region.

!Gunyah != KVM

> Enable the support required to run Qualcomm remoteprocs on non-QHEE
> hypervisors.
> 
> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> ---

[...]

>  
> +	if (of_property_present(pdev->dev.of_node, "iommus")) {
> +		struct of_phandle_args args;
> +
> +		ret = of_parse_phandle_with_args(pdev->dev.of_node, "iommus", "#iommu-cells", 0, &args);
> +		if (ret < 0)
> +			return ret;
> +
> +		rproc->has_iommu = true;
> +		adsp->sid = args.args[0];

Do we ignore the SMR mask completely?

This ties the implementation very closely to arm-smmu-v2. While I don't
expect any changes in there, this is something to keep in mind..

Konrad