linux-kernel - Re: [PATCH] remoteproc: qcom: Add fallback mechanism for full coredump collection

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Date:   Tue, 26 Apr 2022 15:45:42 +0530
From:   Yogesh Lal <quic_ylal@...cinc.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     "Sibi Sankar (QUIC)" <quic_sibis@...cinc.com>,
        "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] remoteproc: qcom: Add fallback mechanism for full
 coredump collection


On 4/22/2022 8:52 PM, Bjorn Andersson wrote:
> WARNING: This email originated from outside of Qualcomm. Please be wary of any links or attachments, and do not enable macros.
>
> On Wed 06 Apr 13:27 CDT 2022, Yogesh Lal wrote:
>
>> In case remoteproc's firmware missing minidump support, during crash
>> scenario coredump does not collected. This change adds a fallback
>> mechanism for full coredump collection in the event of a crash.
>>
>> Signed-off-by: Yogesh Lal <quic_ylal@...cinc.com>
>> ---
>>   drivers/remoteproc/qcom_common.c   | 11 ++++++++---
>>   drivers/remoteproc/qcom_q6v5_pas.c |  1 +
>>   2 files changed, 9 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/remoteproc/qcom_common.c b/drivers/remoteproc/qcom_common.c
>> index 4b91e3c..68bd0bc 100644
>> --- a/drivers/remoteproc/qcom_common.c
>> +++ b/drivers/remoteproc/qcom_common.c
>> @@ -162,13 +162,18 @@ void qcom_minidump(struct rproc *rproc, unsigned int minidump_id)
>>         * 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) != MD_SS_ENABLED ||
>> -         le32_to_cpu(subsystem->encryption_status) != MD_SS_ENCR_DONE) {
>> +             le32_to_cpu(subsystem->status) != 1 ||
>> +             le32_to_cpu(subsystem->enabled) != MD_SS_ENABLED) {
>> +                     return rproc_coredump(rproc);
>> +             }
>> +
>> +     if (le32_to_cpu(subsystem->encryption_status) != MD_SS_ENCR_DONE) {
>>                dev_err(&rproc->dev, "Minidump not ready, skipping\n");
>>                return;
>>        }
>>
>> +     rproc_coredump_cleanup(rproc);
> The patch looks good, but could you please explain in the commit message
> why this needs to be added? If the thing described in the message
> happens this code path wouldn't be taken.
>
> Should it be a separate patch, or is it needed because of the fallback
> etc?
>
> Thanks,
> Bjorn

Will push separate patch for it.

Thanks

Yogesh Lal


>> +
>>        ret = qcom_add_minidump_segments(rproc, subsystem);
>>        if (ret) {
>>                dev_err(&rproc->dev, "Failed with error: %d while adding minidump entries\n", ret);
>> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
>> index 1ae47cc..40bf747 100644
>> --- a/drivers/remoteproc/qcom_q6v5_pas.c
>> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
>> @@ -293,6 +293,7 @@ static const struct rproc_ops adsp_minidump_ops = {
>>        .start = adsp_start,
>>        .stop = adsp_stop,
>>        .da_to_va = adsp_da_to_va,
>> +     .parse_fw = qcom_register_dump_segments,
>>        .load = adsp_load,
>>        .panic = adsp_panic,
>>        .coredump = adsp_minidump,
>> --
>> 2.7.4
>>