From: rishabhb@codeaurora.org
To: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
bjorn.andersson@linaro.org, tsoni@codeaurora.org,
psodagud@codeaurora.org, sidgup@codeaurora.org,
linux-remoteproc-owner@vger.kernel.org
Subject: Re: [PATCH v2 0/3] Expose recovery/coredump configuration from sysfs
Date: Wed, 02 Sep 2020 16:14:19 -0700 [thread overview]
Message-ID: <944061c55a14e28b2a200215c21a9c39@codeaurora.org> (raw)
In-Reply-To: <20200901220542.GA121362@xps15>
On 2020-09-01 15:05, Mathieu Poirier wrote:
> Hi Rishabh,
>
> On Thu, Aug 27, 2020 at 12:48:48PM -0700, Rishabh Bhatnagar wrote:
>> From Android R onwards Google has restricted access to debugfs in user
>> and user-debug builds. This restricts access to most of the features
>> exposed through debugfs. This patch series adds a configurable option
>> to move the recovery/coredump interfaces to sysfs. If the feature
>> flag is selected it would move these interfaces to sysfs and remove
>> the equivalent debugfs interface.
>
> What I meant wast to move the coredump entry from debugfs to sysfs and
> from
> there make it available to user space using a kernel config. But
> thinking
> further on this it may be better to simply provide an API to set the
> coredump
> mode from the platform driver, the same way
> rproc_coredump_set_elf_info() works.
> That will prevent breaking a fair amount of user space code...
>
> Let me know if that can work for you.
>
> Thanks,
> Mathieu
>
Hi Mathieu,
That works for product configuration but that would still limit internal
testing. Since there is also restriction on accessing debugfs through
userspace code, automation won't be able to run recovery/coredump tests.
Only other way for us would be to provide these sysfs entries through
the
platform drivers locally but that would create a lot of mess/redundancy.
>> 'Coredump' and 'Recovery' are critical
>> interfaces that are required for remoteproc to work on Qualcomm
>> Chipsets.
>> Coredump configuration needs to be set to "inline" in debug/test build
>> and "disabled" in production builds. Whereas recovery needs to be
>> "disabled" for debugging purposes and "enabled" on production builds.
>>
>> Changelog:
>>
>> v1 -> v2:
>> - Correct the contact name in the sysfs documentation.
>> - Remove the redundant write documentation for coredump/recovery sysfs
>> - Add a feature flag to make this interface switch configurable.
>>
>> Rishabh Bhatnagar (3):
>> remoteproc: Expose remoteproc configuration through sysfs
>> remoteproc: Add coredump configuration to sysfs
>> remoteproc: Add recovery configuration to sysfs
>>
>> Documentation/ABI/testing/sysfs-class-remoteproc | 44 ++++++++
>> drivers/remoteproc/Kconfig | 12 +++
>> drivers/remoteproc/remoteproc_debugfs.c | 10 +-
>> drivers/remoteproc/remoteproc_sysfs.c | 126
>> +++++++++++++++++++++++
>> 4 files changed, 190 insertions(+), 2 deletions(-)
>>
>> --
>> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora
>> Forum,
>> a Linux Foundation Collaborative Project
>>
next prev parent reply other threads:[~2020-09-02 23:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 19:48 [PATCH v2 0/3] Expose recovery/coredump configuration from sysfs Rishabh Bhatnagar
2020-08-27 19:48 ` [PATCH v2 1/3] remoteproc: Expose remoteproc configuration through sysfs Rishabh Bhatnagar
2020-08-27 19:48 ` [PATCH v2 2/3] remoteproc: Add coredump configuration to sysfs Rishabh Bhatnagar
2020-09-10 17:58 ` Greg KH
2020-08-27 19:48 ` [PATCH v2 3/3] remoteproc: Add recovery " Rishabh Bhatnagar
2020-09-01 22:05 ` [PATCH v2 0/3] Expose recovery/coredump configuration from sysfs Mathieu Poirier
2020-09-02 23:14 ` rishabhb [this message]
2020-09-03 19:45 ` Mathieu Poirier
2020-09-03 23:59 ` Bjorn Andersson
2020-09-04 22:02 ` Mathieu Poirier
2020-09-09 17:27 ` rishabhb
2020-09-09 22:08 ` rishabhb
[not found] ` <0101017473e8b9f1-9c800bfd-d724-473f-96b8-c43920cc8967-000000@us-west-2.amazonses.com>
2020-09-10 17:46 ` Mathieu Poirier
2020-09-10 17:59 ` Greg KH
2020-09-15 9:51 ` Arnaud POULIQUEN
2020-09-26 3:31 ` Bjorn Andersson
2020-09-29 7:43 ` Arnaud POULIQUEN
2020-10-14 0:32 ` Bjorn Andersson
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