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

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Date:   Thu, 29 Jun 2023 14:50:34 +0530
From:   Mukesh Ojha <quic_mojha@...cinc.com>
To:     Pavan Kondeti <quic_pkondeti@...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 6/28/2023 9:21 PM, Pavan Kondeti wrote:
> 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..

It was ending up with circular dependency due to
rproc_coredump_add_custom_segment()


rproc_coredump => qcom_common => qcom_minidump_smem => rproc_coredump

-Mukesh

> 
> Thanks,
> Pavan
>