linux-kernel - Re: [PATCH v6 7/8] remoteproc: qcom: Add support for memory sandbox

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Message-ID: <3c951582-070c-675f-14c7-ca033ca347b6@quicinc.com>
Date:   Wed, 14 Sep 2022 15:40:33 +0530
From:   Sibi Sankar <quic_sibis@...cinc.com>
To:     Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>,
        <linux-remoteproc@...r.kernel.org>, <agross@...nel.org>,
        <bjorn.andersson@...aro.org>, <lgirdwood@...il.com>,
        <broonie@...nel.org>, <robh+dt@...nel.org>,
        <quic_plai@...cinc.com>, <bgoswami@...cinc.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <srinivas.kandagatla@...aro.org>,
        <quic_rohkumar@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <swboyd@...omium.org>,
        <judyhsiao@...omium.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 7/8] remoteproc: qcom: Add support for memory sandbox



On 9/8/22 6:53 PM, Srinivasa Rao Mandadapu wrote:
> Update pil driver with SMMU mapping for allowing authorised
> memory access to ADSP firmware, by carveout reserved adsp memory
> region from device tree file.
> 
> Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@...cinc.com>
> ---
> Changes since V5:
> 	-- Remove adsp_rproc_unmap_smmu, adsp_of_unmap_smmu, adsp_of_map_smmu and
> 	   adsp_rproc_map_smmu functions.
> 	-- Remove find_loaded_rsc_table call back initialization.
> 	-- Rename adsp_sandbox_needed to has_iommu.
> Changes since V4:
> 	-- Split the code and add appropriate APIs for resource allocation and free.
> 	-- Update adsp_unmap_smmu with missing free ops call.
> 	-- Update normalizing length value in adsp_of_unmap_smmu.
> Changes since V3:
> 	-- Rename is_adsp_sb_needed to adsp_sandbox_needed.
> 	-- Add smmu unmapping in error case and in adsp stop.
> Changes since V2:
> 	-- Replace platform_bus_type with adsp->dev->bus.
> 	-- Use API of_parse_phandle_with_args() instead of of_parse_phandle_with_fixed_args().
> 	-- Replace adsp->is_wpss with adsp->is_adsp.
> 	-- Update error handling in adsp_start().
> 
>   drivers/remoteproc/qcom_q6v5_adsp.c | 55 ++++++++++++++++++++++++++++++++++++-
>   1 file changed, 54 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c
> index ccb5592..e55d593 100644
> --- a/drivers/remoteproc/qcom_q6v5_adsp.c
> +++ b/drivers/remoteproc/qcom_q6v5_adsp.c
> @@ -9,6 +9,7 @@
>   #include <linux/firmware.h>
>   #include <linux/interrupt.h>
>   #include <linux/io.h>
> +#include <linux/iommu.h>
>   #include <linux/iopoll.h>
>   #include <linux/kernel.h>
>   #include <linux/mfd/syscon.h>
> @@ -48,6 +49,8 @@
>   #define LPASS_PWR_ON_REG		0x10
>   #define LPASS_HALTREQ_REG		0x0
>   
> +#define SID_MASK_DEFAULT        0xF
> +
>   #define QDSP6SS_XO_CBCR		0x38
>   #define QDSP6SS_CORE_CBCR	0x20
>   #define QDSP6SS_SLEEP_CBCR	0x3c
> @@ -333,6 +336,42 @@ static int adsp_load(struct rproc *rproc, const struct firmware *fw)
>   	return 0;
>   }
>   
> +static void adsp_unmap_smmu(struct rproc *rproc)
> +{
> +	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> +
> +	iommu_unmap(rproc->domain, adsp->mem_phys, adsp->mem_size);
> +}
> +
> +static int adsp_map_smmu(struct qcom_adsp *adsp, struct rproc *rproc)

you could perhaps name the func to adsp_map_carveout/adsp_unmap_carveout


> +{
> +	struct of_phandle_args args;
> +	long long sid;
> +	unsigned long iova;
> +	int ret;
> +
> +	if (!rproc->domain)
> +		return -EINVAL;
> +
> +	ret = of_parse_phandle_with_args(adsp->dev->of_node, "iommus", "#iommu-cells", 0, &args);
> +	if (ret < 0)
> +		return ret;
> +
> +	sid = args.args[0] & SID_MASK_DEFAULT;
> +
> +	/* Add SID configuration for ADSP Firmware to SMMU */
> +	iova =  adsp->mem_phys | (sid << 32);
> +
> +	ret = iommu_map(rproc->domain, iova, adsp->mem_phys,
> +			adsp->mem_size,	IOMMU_READ | IOMMU_WRITE);
> +	if (ret) {
> +		dev_err(adsp->dev, "Unable to map ADSP Physical Memory\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
>   static int adsp_start(struct rproc *rproc)
>   {
>   	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
> @@ -343,9 +382,17 @@ static int adsp_start(struct rproc *rproc)
>   	if (ret)
>   		return ret;
>   
> +	if (adsp->has_iommu) {
> +		ret = adsp_map_smmu(adsp, rproc);
> +		if (ret) {
> +			dev_err(adsp->dev, "ADSP smmu mapping failed\n");
> +			goto disable_irqs;
> +		}
> +	}
> +
>   	ret = clk_prepare_enable(adsp->xo);
>   	if (ret)
> -		goto disable_irqs;
> +		goto adsp_smmu_unmap;
>   
>   	ret = qcom_rproc_pds_enable(adsp, adsp->proxy_pds,
>   				    adsp->proxy_pd_count);
> @@ -401,6 +448,9 @@ static int adsp_start(struct rproc *rproc)
>   	qcom_rproc_pds_disable(adsp, adsp->proxy_pds, adsp->proxy_pd_count);
>   disable_xo_clk:
>   	clk_disable_unprepare(adsp->xo);
> +adsp_smmu_unmap:
> +	if (adsp->has_iommu)
> +		adsp_unmap_smmu(rproc);
>   disable_irqs:
>   	qcom_q6v5_unprepare(&adsp->q6v5);
>   
> @@ -429,6 +479,9 @@ static int adsp_stop(struct rproc *rproc)
>   	if (ret)
>   		dev_err(adsp->dev, "failed to shutdown: %d\n", ret);
>   
> +	if (adsp->has_iommu)
> +		adsp_unmap_smmu(rproc);
> +
>   	handover = qcom_q6v5_unprepare(&adsp->q6v5);
>   	if (handover)
>   		qcom_adsp_pil_handover(&adsp->q6v5);
>