linux-kernel - Re: [PATCH v10] remoteproc: qcom: Move minidump related layout and API to soc/qcom directory

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Date: Tue, 28 May 2024 16:27:11 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Mukesh Ojha <quic_mojha@...cinc.com>
Cc: mathieu.poirier@...aro.org, konrad.dybcio@...aro.org, 
	linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v10] remoteproc: qcom: Move minidump related layout and
 API to soc/qcom directory

On Fri, May 03, 2024 at 01:48:07PM GMT, Mukesh Ojha wrote:
> Currently, Qualcomm Minidump is being used to collect mini version of
> remoteproc coredump with the help of boot firmware however, Minidump
> as a feature is not limited to be used only for remote processor and
> can also be used for Application processors. So, in preparation of
> using it move the Minidump related data structure and its function
> to its own file under drivers/soc/qcom with qcom_rproc_minidump.c
> which clearly says it is only for remoteproc minidump.
> 
> Extra changes made apart from the movement is,
> 1. Adds new config, kernel headers and module macros to get this
>    module compiled.
> 2. Guards the qcom_minidump() with CONFIG_QCOM_RPROC_MINIDUMP.
> 3. Selects this QCOM_RPROC_MINIDUMP config when QCOM_RPROC_COMMON
>    enabled.
> 4. Added new header qcom_minidump.h .
> 
> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>

I wouldn't be able to merge this without anything depending on it...

[..]
> diff --git a/drivers/soc/qcom/qcom_rproc_minidump.c b/drivers/soc/qcom/qcom_rproc_minidump.c
[..]
> +void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
> +		void (*rproc_dumpfn_t)(struct rproc *rproc,
> +		struct rproc_dump_segment *segment, void *dest, size_t offset,
> +		size_t size))
> +{
> +	int ret;
> +	struct minidump_subsystem *subsystem;
> +	struct minidump_global_toc *toc;
> +
> +	/* Get Global minidump ToC*/
> +	toc = qcom_smem_get(QCOM_SMEM_HOST_ANY, SBL_MINIDUMP_SMEM_ID, NULL);
> +
> +	/* check if global table pointer exists and init is set */
> +	if (IS_ERR(toc) || !toc->status) {
> +		dev_err(&rproc->dev, "Minidump TOC not found in SMEM\n");
> +		return;
> +	}
> +
> +	/* Get subsystem table of contents using the minidump id */
> +	subsystem = &toc->subsystems[minidump_id];
> +
> +	/**
> +	 * Collect minidump if SS ToC is valid and segment table
> +	 * is initialized in memory and encryption status is set.
> +	 */
> +	if (subsystem->regions_baseptr == 0 ||
> +	    le32_to_cpu(subsystem->status) != 1 ||
> +	    le32_to_cpu(subsystem->enabled) != MINIDUMP_SS_ENABLED) {
> +		return rproc_coredump(rproc);
> +	}
> +
> +	if (le32_to_cpu(subsystem->encryption_status) != MINIDUMP_SS_ENCR_DONE) {
> +		dev_err(&rproc->dev, "Minidump not ready, skipping\n");
> +		return;
> +	}
> +
> +	/**
> +	 * Clear out the dump segments populated by parse_fw before
> +	 * re-populating them with minidump segments.
> +	 */
> +	rproc_coredump_cleanup(rproc);

I don't think this should be invoked outside drivers/remoteproc, and the
comment talks about a remoteproc-internal concern...

> +
> +	ret = qcom_add_minidump_segments(rproc, subsystem, rproc_dumpfn_t);

This function changes the internal state of the remoteproc and relies on
other operations to clean things up.

I think we could come up with a better design of this, and I don't think
we should spread this outside of the remoteproc framework.

Regards,
Bjorn

> +	if (ret) {
> +		dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
> +		goto clean_minidump;
> +	}
> +	rproc_coredump_using_sections(rproc);
> +clean_minidump:
> +	qcom_minidump_cleanup(rproc);
> +}
> +EXPORT_SYMBOL_GPL(qcom_minidump);
> +
> +MODULE_DESCRIPTION("Qualcomm Remoteproc Minidump helper module");
> +MODULE_LICENSE("GPL");
> diff --git a/include/soc/qcom/qcom_minidump.h b/include/soc/qcom/qcom_minidump.h
> new file mode 100644
> index 000000000000..0fe156066bc0
> --- /dev/null
> +++ b/include/soc/qcom/qcom_minidump.h
> @@ -0,0 +1,23 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
> + */
> +
> +#ifndef _QCOM_MINIDUMP_H_
> +#define _QCOM_MINIDUMP_H_
> +
> +struct rproc;
> +struct rproc_dump_segment;
> +
> +#if IS_ENABLED(CONFIG_QCOM_RPROC_MINIDUMP)
> +void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
> +		   void (*rproc_dumpfn_t)(struct rproc *rproc,
> +		   struct rproc_dump_segment *segment, void *dest, size_t offset,
> +		   size_t size));
> +#else
> +static inline void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
> +		   void (*rproc_dumpfn_t)(struct rproc *rproc,
> +		   struct rproc_dump_segment *segment, void *dest, size_t offset,
> +		   size_t size)) { }
> +#endif /* CONFIG_QCOM_RPROC_MINIDUMP */
> +#endif /* _QCOM_MINIDUMP_H_ */
> -- 
> 2.7.4
>