linux-kernel - Re: [PATCH v9 2/8] remoteproc: qcom: Add secure PIL support

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Date: Sat, 22 Jun 2024 00:17:50 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>
Cc: sboyd@...nel.org, andersson@...nel.org, bjorn.andersson@...aro.org, 
	david.brown@...aro.org, devicetree@...r.kernel.org, jassisinghbrar@...il.com, 
	linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-remoteproc@...r.kernel.org, mark.rutland@....com, mturquette@...libre.com, ohad@...ery.com, 
	robh@...nel.org, sricharan@...eaurora.org, gokulsri@...eaurora.org
Subject: Re: [PATCH v9 2/8] remoteproc: qcom: Add secure PIL support

On Fri, Jun 21, 2024 at 05:16:53PM GMT, Gokul Sriram Palanisamy wrote:
> IPQ8074 uses secure PIL. Hence, adding the support for the same.

See Documentation/process/submitting-patches.rst

> 
> Signed-off-by: Nikhil Prakash V <quic_nprakash@...cinc.com>
> Signed-off-by: Sricharan R <quic_srichara@...cinc.com>
> Signed-off-by: Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>
> ---
>  drivers/remoteproc/qcom_q6v5_wcss.c | 43 +++++++++++++++++++++++++++--
>  1 file changed, 40 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c b/drivers/remoteproc/qcom_q6v5_wcss.c
> index 366b19cbd994..e45e79d80238 100644
> --- a/drivers/remoteproc/qcom_q6v5_wcss.c
> +++ b/drivers/remoteproc/qcom_q6v5_wcss.c
> @@ -18,6 +18,7 @@
>  #include <linux/regulator/consumer.h>
>  #include <linux/reset.h>
>  #include <linux/soc/qcom/mdt_loader.h>
> +#include <linux/firmware/qcom/qcom_scm.h>
>  #include "qcom_common.h"
>  #include "qcom_pil_info.h"
>  #include "qcom_q6v5.h"
> @@ -86,6 +87,9 @@
>  #define TCSR_WCSS_CLK_ENABLE	0x14
>  
>  #define MAX_HALT_REG		3
> +
> +#define WCNSS_PAS_ID		6
> +
>  enum {
>  	WCSS_IPQ8074,
>  	WCSS_QCS404,
> @@ -134,6 +138,7 @@ struct q6v5_wcss {
>  	unsigned int crash_reason_smem;
>  	u32 version;
>  	bool requires_force_stop;
> +	bool need_mem_protection;

needs

>  
>  	struct qcom_rproc_glink glink_subdev;
>  	struct qcom_rproc_ssr ssr_subdev;
> @@ -152,6 +157,7 @@ struct wcss_data {
>  	int ssctl_id;
>  	const struct rproc_ops *ops;
>  	bool requires_force_stop;
> +	bool need_mem_protection;

needs

>  };
>  
>  static int q6v5_wcss_reset(struct q6v5_wcss *wcss)
> @@ -251,6 +257,15 @@ static int q6v5_wcss_start(struct rproc *rproc)
>  
>  	qcom_q6v5_prepare(&wcss->q6v5);
>  
> +	if (wcss->need_mem_protection) {
> +		ret = qcom_scm_pas_auth_and_reset(WCNSS_PAS_ID);
> +		if (ret) {
> +			dev_err(wcss->dev, "wcss_reset failed\n");
> +			return ret;
> +		}
> +		goto wait_for_reset;
> +	}

Use if/else instead of a goto.

> +
>  	/* Release Q6 and WCSS reset */
>  	ret = reset_control_deassert(wcss->wcss_reset);
>  	if (ret) {
> @@ -285,6 +300,7 @@ static int q6v5_wcss_start(struct rproc *rproc)
>  	if (ret)
>  		goto wcss_q6_reset;
>  
> +wait_for_reset:

This is more like wait_for_start

>  	ret = qcom_q6v5_wait_for_start(&wcss->q6v5, 5 * HZ);
>  	if (ret == -ETIMEDOUT)
>  		dev_err(wcss->dev, "start timed out\n");
> @@ -718,6 +734,15 @@ static int q6v5_wcss_stop(struct rproc *rproc)
>  	struct q6v5_wcss *wcss = rproc->priv;
>  	int ret;
>  
> +	if (wcss->need_mem_protection) {
> +		ret = qcom_scm_pas_shutdown(WCNSS_PAS_ID);
> +		if (ret) {
> +			dev_err(wcss->dev, "not able to shutdown\n");
> +			return ret;
> +		}
> +		goto pas_done;
> +	}

if/else. Or abstract this to functions.

> +
>  	/* WCSS powerdown */
>  	if (wcss->requires_force_stop) {
>  		ret = qcom_q6v5_request_stop(&wcss->q6v5, NULL);
> @@ -742,6 +767,7 @@ static int q6v5_wcss_stop(struct rproc *rproc)
>  			return ret;
>  	}
>  
> +pas_done:
>  	clk_disable_unprepare(wcss->prng_clk);
>  	qcom_q6v5_unprepare(&wcss->q6v5);
>  
> @@ -765,9 +791,15 @@ static int q6v5_wcss_load(struct rproc *rproc, const struct firmware *fw)
>  	struct q6v5_wcss *wcss = rproc->priv;
>  	int ret;
>  
> -	ret = qcom_mdt_load_no_init(wcss->dev, fw, rproc->firmware,
> -				    0, wcss->mem_region, wcss->mem_phys,
> -				    wcss->mem_size, &wcss->mem_reloc);
> +	if (wcss->need_mem_protection)
> +		ret = qcom_mdt_load(wcss->dev, fw, rproc->firmware,
> +				    WCNSS_PAS_ID, wcss->mem_region,
> +				    wcss->mem_phys, wcss->mem_size,
> +				    &wcss->mem_reloc);
> +	else
> +		ret = qcom_mdt_load_no_init(wcss->dev, fw, rproc->firmware,
> +					    0, wcss->mem_region, wcss->mem_phys,
> +					    wcss->mem_size, &wcss->mem_reloc);
>  	if (ret)
>  		return ret;
>  
> @@ -1035,6 +1067,9 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
>  	if (!desc)
>  		return -EINVAL;
>  
> +	if (desc->need_mem_protection && !qcom_scm_is_available())
> +		return -EPROBE_DEFER;
> +
>  	rproc = devm_rproc_alloc(&pdev->dev, pdev->name, desc->ops,
>  				 desc->firmware_name, sizeof(*wcss));
>  	if (!rproc) {
> @@ -1048,6 +1083,7 @@ static int q6v5_wcss_probe(struct platform_device *pdev)
>  
>  	wcss->version = desc->version;
>  	wcss->requires_force_stop = desc->requires_force_stop;
> +	wcss->need_mem_protection = desc->need_mem_protection;
>  
>  	ret = q6v5_wcss_init_mmio(wcss, pdev);
>  	if (ret)
> @@ -1111,6 +1147,7 @@ static const struct wcss_data wcss_ipq8074_res_init = {
>  	.wcss_q6_reset_required = true,
>  	.ops = &q6v5_wcss_ipq8074_ops,
>  	.requires_force_stop = true,
> +	.need_mem_protection = true,
>  };
>  
>  static const struct wcss_data wcss_qcs404_res_init = {
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry