linux-kernel - Re: [PATCH v6 12/14] remoteproc: pas: Extend parse_fw callback to fetch resources via SMC call

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Message-ID: <89e65adf-fdd4-4b98-a220-fb0f77dae7c6@oss.qualcomm.com>
Date: Fri, 7 Nov 2025 11:47:02 +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 12/14] remoteproc: pas: Extend parse_fw callback to
 fetch resources via SMC call

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. 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 from SMC call along with dynamic
> resources.

[...]

> +	/*
> +	 * Qualcomm remote processor may rely on static and dynamic resources for
> +	 * it to be functional. 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 present 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 from SMC call along with dynamic resources.

How about:

"""
The resources consumed by Qualcomm remote processors fall into two categories:
static (such as the memory carveouts for the rproc firmware) and dynamic (like
shared memory pools).

Both are managed by a Qualcomm hypervisor (such as QHEE or Gunyah), if one is
present.

Otherwise, a resource table must be retrieved via an SCM call. That table will
list all dynamic resources (if any) and possibly the static ones.
The static resources may also come from a resource table embedded in the rproc
firmware instead.
"""

?

> +	 *
> +	 * Here, we call rproc_elf_load_rsc_table() to check firmware binary has resources
> +	 * or not and if it is not having then we pass NULL and zero as input resource
> +	 * table pointer and size respectively to the argument of qcom_scm_pas_get_rsc_table()
> +	 * and this is even true for Qualcomm remote processor who does follow remoteproc
> +	 * framework.
> +	 */
> +	ret = qcom_scm_pas_get_rsc_table(pas->pas_ctx, table, table_sz, &output_rt,
> +					 &output_rt_size);
> +	if (ret) {
> +		dev_err(pas->dev, "Error in getting resource table: %d\n", ret);
> +		return ret;
> +	}
> +
> +	kfree(rproc->cached_table);

Would this not simply discard the firmware binary table in the "split case"?

Konrad

> +	rproc->cached_table = output_rt;
> +	rproc->table_ptr = rproc->cached_table;
> +	rproc->table_sz = output_rt_size;
> +
> +	return ret;
> +}
> +
>  static unsigned long qcom_pas_panic(struct rproc *rproc)
>  {
>  	struct qcom_pas *pas = rproc->priv;
> @@ -425,7 +481,7 @@ static const struct rproc_ops qcom_pas_ops = {
>  	.start = qcom_pas_start,
>  	.stop = qcom_pas_stop,
>  	.da_to_va = qcom_pas_da_to_va,
> -	.parse_fw = qcom_register_dump_segments,
> +	.parse_fw = qcom_pas_parse_firmware,
>  	.load = qcom_pas_load,
>  	.panic = qcom_pas_panic,
>  };
> @@ -435,7 +491,7 @@ static const struct rproc_ops qcom_pas_minidump_ops = {
>  	.start = qcom_pas_start,
>  	.stop = qcom_pas_stop,
>  	.da_to_va = qcom_pas_da_to_va,
> -	.parse_fw = qcom_register_dump_segments,
> +	.parse_fw = qcom_pas_parse_firmware,
>  	.load = qcom_pas_load,
>  	.panic = qcom_pas_panic,
>  	.coredump = qcom_pas_minidump,
>