linux-kernel - Re: [PATCH v6 11/14] firmware: qcom_scm: Add qcom_scm_pas_get_rsc

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Message-ID: <5239980b-f74c-4458-a7e3-a5e7f6927449@oss.qualcomm.com>
Date: Fri, 7 Nov 2025 11:20:20 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Mukesh Ojha <mukesh.ojha@....qualcomm.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>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.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 v6 11/14] firmware: qcom_scm: Add
 qcom_scm_pas_get_rsc_table() to get resource table

On 11/4/25 8:35 AM, Mukesh Ojha wrote:
> Qualcomm remote processor may rely on Static and Dynamic resources for
> it to be functional. Static resources are fixed like for example,
> memory-mapped addresses required by the subsystem and dynamic
> resources, such as shared memory in DDR etc., are determined at
> runtime during the boot process.
> 
> For most of the Qualcomm SoCs, when run with Gunyah or older QHEE
> hypervisor, all the resources whether it is static or dynamic, is
> managed by the hypervisor. Dynamic resources if it is present for a
> remote processor will always be coming from secure world via SMC call
> while static resources may be present in remote processor firmware
> binary or it may be coming qcom_scm_pas_get_rsc_table() SMC call along
> with dynamic resources.

[...]


> +	/*
> +	 * TrustZone can not accept buffer as NULL value as argument Hence,
> +	 * we need to pass a input buffer indicating that subsystem firmware
> +	 * does not have resource table by filling resource table structure.
> +	 */
> +	if (!input_rt)
> +		input_rt_size = sizeof(*rsc);

Would the expected size of the received data ever be any different
than sizeof(*rsc) anyway?

[...]

> +int qcom_scm_pas_get_rsc_table(struct qcom_scm_pas_context *ctx, void *input_rt,
> +			       size_t input_rt_size, void **output_rt,
> +			       size_t *output_rt_size)
> +{
> +	int ret;
> +
> +	do {
> +		*output_rt = kzalloc(*output_rt_size, GFP_KERNEL);
> +		if (!*output_rt)
> +			return -ENOMEM;
> +
> +		ret = __qcom_scm_pas_get_rsc_table(ctx->pas_id, input_rt,
> +						   input_rt_size, output_rt,
> +						   output_rt_size);
> +		if (ret)
> +			kfree(*output_rt);
> +
> +	} while (ret == -EAGAIN);

This should at the very least be limited to a number of retries

Konrad