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

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Message-ID: <9eb910d4-e521-4c14-8e73-8fd3d5ff9573@linaro.org>
Date: Mon, 7 Oct 2024 10:05:08 +0200
From: neil.armstrong@...aro.org
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 04/10/2024 23:23, 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.
> 
> Enable the support required to run Qualcomm remoteprocs on non-QHEE
> hypervisors.
> 
> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
> ---
>   drivers/remoteproc/qcom_q6v5_pas.c | 41 +++++++++++++++++++++++++++++-
>   1 file changed, 40 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index ac339145e072..13bd13f1b989 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -122,6 +122,7 @@ struct qcom_adsp {
>   
>   	struct qcom_devmem_table *devmem;
>   	struct qcom_tzmem_area *tzmem;
> +	unsigned long sid;
>   };
>   
>   static void adsp_segment_dump(struct rproc *rproc, struct rproc_dump_segment *segment,
> @@ -310,9 +311,21 @@ static int adsp_start(struct rproc *rproc)
>   	if (ret)
>   		return ret;
>   
> +	ret = qcom_map_unmap_carveout(rproc, adsp->mem_phys, adsp->mem_size, true, true, adsp->sid);
> +	if (ret) {
> +		dev_err(adsp->dev, "iommu mapping failed, ret: %d\n", ret);
> +		goto disable_irqs;
> +	}
> +
> +	ret = qcom_map_devmem(rproc, adsp->devmem, true, adsp->sid);
> +	if (ret) {
> +		dev_err(adsp->dev, "devmem iommu mapping failed, ret: %d\n", ret);
> +		goto unmap_carveout;
> +	}
> +
>   	ret = adsp_pds_enable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
>   	if (ret < 0)
> -		goto disable_irqs;
> +		goto unmap_devmem;
>   
>   	ret = clk_prepare_enable(adsp->xo);
>   	if (ret)
> @@ -400,6 +413,10 @@ static int adsp_start(struct rproc *rproc)
>   	clk_disable_unprepare(adsp->xo);
>   disable_proxy_pds:
>   	adsp_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
> +unmap_devmem:
> +	qcom_unmap_devmem(rproc, adsp->devmem, adsp->sid);
> +unmap_carveout:
> +	qcom_map_unmap_carveout(rproc, adsp->mem_phys, adsp->mem_size, false, true, adsp->sid);
>   disable_irqs:
>   	qcom_q6v5_unprepare(&adsp->q6v5);
>   
> @@ -445,6 +462,9 @@ static int adsp_stop(struct rproc *rproc)
>   			dev_err(adsp->dev, "failed to shutdown dtb: %d\n", ret);
>   	}
>   
> +	qcom_unmap_devmem(rproc, adsp->devmem, adsp->sid);
> +	qcom_map_unmap_carveout(rproc, adsp->mem_phys, adsp->mem_size, false, true, adsp->sid);
> +
>   	handover = qcom_q6v5_unprepare(&adsp->q6v5);
>   	if (handover)
>   		qcom_pas_handover(&adsp->q6v5);
> @@ -844,6 +864,25 @@ static int adsp_probe(struct platform_device *pdev)
>   	}
>   	platform_set_drvdata(pdev, adsp);
>   
> +	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];
> +		of_node_put(args.np);
> +		ret = adsp_devmem_init(adsp);
> +		if (ret)
> +			return ret;

Why don't you get this table from the firmware like presumably QHEE does ?

Neil

> +
> +		adsp->pas_metadata.shm_bridge_needed = true;
> +	} else {
> +		rproc->has_iommu = false;
> +	}
> +
>   	ret = device_init_wakeup(adsp->dev, true);
>   	if (ret)
>   		goto free_rproc;