linux-hardening - Re: [PATCH v4 13/21] remoterproc: qcom: refactor to leverage exported minidump symbol

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Message-ID: <f1581356-97ba-4faa-8e1c-0d5c7ba994e3@quicinc.com>
Date:   Wed, 28 Jun 2023 21:21:44 +0530
From:   Pavan Kondeti <quic_pkondeti@...cinc.com>
To:     Mukesh Ojha <quic_mojha@...cinc.com>
CC:     <corbet@....net>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <keescook@...omium.org>, <tony.luck@...el.com>,
        <gpiccoli@...lia.com>, <mathieu.poirier@...aro.org>,
        <catalin.marinas@....com>, <will@...nel.org>,
        <linus.walleij@...aro.org>, <andy.shevchenko@...il.com>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-hardening@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-gpio@...r.kernel.org>
Subject: Re: [PATCH v4 13/21] remoterproc: qcom: refactor to leverage
 exported minidump symbol

On Wed, Jun 28, 2023 at 06:04:40PM +0530, Mukesh Ojha wrote:
> -static int qcom_add_minidump_segments(struct rproc *rproc, struct minidump_subsystem *subsystem,
> -			void (*rproc_dumpfn_t)(struct rproc *rproc, struct rproc_dump_segment *segment,
> -				void *dest, size_t offset, size_t size))
> +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))
>  {
> -	struct minidump_region __iomem *ptr;
> -	struct minidump_region region;
> -	int seg_cnt, i;
>  	dma_addr_t da;
>  	size_t size;
> +	int seg_cnt;
>  	char *name;
> +	void *ptr;
> +	int ret;
> +	int i;
>  
>  	if (WARN_ON(!list_empty(&rproc->dump_segments))) {
>  		dev_err(&rproc->dev, "dump segment list already populated\n");
> -		return -EUCLEAN;
> +		return;
>  	}
>  
> -	seg_cnt = le32_to_cpu(subsystem->region_count);
> -	ptr = ioremap((unsigned long)le64_to_cpu(subsystem->regions_baseptr),
> -		      seg_cnt * sizeof(struct minidump_region));
> +	ptr = qcom_ss_md_mapped_base(minidump_id, &seg_cnt);
>  	if (!ptr)
> -		return -EFAULT;
> +		return;
>  
>  	for (i = 0; i < seg_cnt; i++) {
> -		memcpy_fromio(&region, ptr + i, sizeof(region));
> -		if (le32_to_cpu(region.valid) == MINIDUMP_REGION_VALID) {
> -			name = kstrndup(region.name, MAX_REGION_NAME_LENGTH - 1, GFP_KERNEL);
> -			if (!name) {
> -				iounmap(ptr);
> -				return -ENOMEM;
> -			}
> -			da = le64_to_cpu(region.address);
> -			size = le64_to_cpu(region.size);
> -			rproc_coredump_add_custom_segment(rproc, da, size, rproc_dumpfn_t, name);
> +		ret = qcom_ss_valid_segment_info(ptr, i, &name, &da, &size);
> +		if (ret < 0) {
> +			iounmap(ptr);
> +			dev_err(&rproc->dev,
> +				"Failed with error: %d while adding minidump entries\n",
> +				ret);
> +			goto clean_minidump;
>  		}
> -	}
> -
> -	iounmap(ptr);
> -	return 0;
> -}
> -
> -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 ||
> -	    le32_to_cpu(subsystem->encryption_status) != MINIDUMP_SS_ENCR_DONE) {
> -		dev_err(&rproc->dev, "Minidump not ready, skipping\n");
> -		return;
> +		/* if it is a valid segment */
> +		if (!ret)
> +			rproc_coredump_add_custom_segment(rproc, da, size,
> +							  rproc_dumpfn_t, name);
>  	}
>  
> -	ret = qcom_add_minidump_segments(rproc, subsystem, rproc_dumpfn_t);
> -	if (ret) {
> -		dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
> -		goto clean_minidump;
> -	}
> +	iounmap(ptr);
>  	rproc_coredump_using_sections(rproc);
> +
>  clean_minidump:
>  	qcom_minidump_cleanup(rproc);
>  }

I like the idea of moving minidump pieces to drivers/soc/qcom/*minidump*.

Is it possible to accept one function callback from remoteproc and do
all of this in one function exported by minidump? 

qcom_ss_valid_segment_info() seems a low level function to be exported..

Thanks,
Pavan