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Message-ID: <d157eb91-74e1-b6e7-c95a-3b69f06f2270@quicinc.com>
Date: Wed, 31 Jan 2024 16:35:02 +0530
From: Mukesh Ojha <quic_mojha@...cinc.com>
To: <corbet@....net>, <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>, <vigneshr@...com>,
<nm@...com>, <matthias.bgg@...il.com>, <kgene@...nel.org>,
<alim.akhtar@...sung.com>, <bmasney@...hat.com>
CC: <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v8 00/10] Add Qualcomm APSS Minidump driver related
support
Please ignore the series; looks like it got missed quite a few people
and mailing lists. I will resend this.
-Mukesh
On 1/31/2024 4:27 PM, Mukesh Ojha wrote:
> Abstract and PDF here:
> https://lpc.events/event/17/contributions/1468/
>
> Video:
> https://www.youtube.com/watch?v=3vL3gtAu84s
>
> Patch 1 deals in detail documentation on minidump.
> Patch 2-4 refactors minidump existing layout and separate it from remoteproc files.
> Patch 6 is the Qualcomm APSS minidump driver.
> Patch 7-10 Enable support to reserve dynamic ramoops and the support to
> register ramoops region with minidump.
>
> Detail about Minidump is discussed in documentation patch (1/10) and also briefly
> discussed after below changelog.
>
> Changes in v8:
> - Addressed documentation comment made by Randy Dunlap.
> - Rebased on linux-next tag next-20240130
>
> Changes in v7:
> - Addressed comment made by [Pavan.K] to use generic notifiers.
> - Addresses comment made on Dynamic ramoops about error handling.
> - Significant change minidump documentation suggested by [Bryan O'Donoghue]
> - Added Reviewed by from [Bagas]
> - Renamed ramoops notifiers.
>
> Changes in v6: https://lore.kernel.org/lkml/1700864395-1479-1-git-send-email-quic_mojha@quicinc.com/
> - Accumalated the feedback received on v5 and rebase v5 versions in v6.
> - Removed the exported function as there is no current users of them.
> - Applied [Pavan.K] suggestion on caller/callee placement of dynamic ramoops reserve memory.
> - Addressed [krzysztof] comment on sizeof() and to have qcom_apss_md_table_exit().
> - Addressed [Bagas.S] comment on minidump doc.
> - Tried to implement [Kees] suggestion in slight different way with callback registration
> with ramoops instead of pstore core.
>
> Change in rebase v5: https://lore.kernel.org/lkml/1694429639-21484-1-git-send-email-quic_mojha@quicinc.com/
> - Rebased it on latest tag available on linux-next
> - Added missed Poovendhan sign-off on 15/17 and tested-by tag from
> Kathiravan. Thanks to him for testing and reminding me of missing sign-off.
>
> Changes in v5: https://lore.kernel.org/lkml/1694290578-17733-1-git-send-email-quic_mojha@quicinc.com/
> - On suggestion from Pavan.k, to have single function call for minidump collection
> from remoteproc driver, separated the logic to have separate minidump file called
> qcom_rproc_minidump.c and also renamed the function from qcom_minidump() to
> qcom_rproc_minidump(); however, dropped his suggestion about rework on lazy deletion
> during region unregister in this series, will pursue it in next series.
>
> - To simplify the minidump driver, removed the complication for frontend and different
> backend from Greg suggestion, will pursue this once main driver gets mainlined.
>
> - Move the dynamic ramoops region allocation from Device tree approach to command line
> approch with the introduction command line parsing and memblock reservation during
> early boot up; Not added documentation about it yet, will add if it gets positive
> response.
>
> - Exporting linux banner from kernel to make minidump build also as module, however,
> minidump is a debug module and should be kernel built to get most debug information
> from kernel.
>
> - Tried to address comments given on dload patch series.
>
> Changes in v4: https://lore.kernel.org/lkml/1687955688-20809-1-git-send-email-quic_mojha@quicinc.com/
> - Redesigned the driver and divided the driver into front end and backend (smem) so
> that any new backend can be attached easily to avoid code duplication.
> - Patch reordering as per the driver and subsystem to easier review of the code.
> - Removed minidump specific code from remoteproc to minidump smem based driver.
> - Enabled the all the driver as modules.
> - Address comments made on documentation and yaml and Device tree file [Krzysztof/Konrad]
> - Address comments made qcom_pstore_minidump driver and given its Device tree
> same set of properties as ramoops. [Luca/Kees]
> - Added patch for MAINTAINER file.
> - Include defconfig change as one patch as per [Krzysztof] suggestion.
> - Tried to remove the redundant file scope variables from the module as per [Krzysztof] suggestion.
> - Addressed comments made on dload mode patch v6 version
> https://lore.kernel.org/lkml/1680076012-10785-1-git-send-email-quic_mojha@quicinc.com/
>
> Changes in v3: https://lore.kernel.org/lkml/1683133352-10046-1-git-send-email-quic_mojha@quicinc.com/
> - Addressed most of the comments by Srini on v2 and refactored the minidump driver.
> - Added platform device support
> - Unregister region support.
> - Added update region for clients.
> - Added pending region support.
> - Modified the documentation guide accordingly.
> - Added qcom_pstore_ramdump client driver which happen to add ramoops platform
> device and also registers ramoops region with minidump.
> - Added download mode patch series with this minidump series.
> https://lore.kernel.org/lkml/1680076012-10785-1-git-send-email-quic_mojha@quicinc.com/
>
> Changes in v2: https://lore.kernel.org/lkml/1679491817-2498-1-git-send-email-quic_mojha@quicinc.com/
> - Addressed review comment made by [quic_tsoni/bmasney] to add documentation.
> - Addressed comments made by [srinivas.kandagatla]
> - Dropped pstore 6/6 from the last series, till i get conclusion to get pstore
> region in minidump.
> - Fixed issue reported by kernel test robot.
>
> Changes in v1: https://lore.kernel.org/lkml/1676978713-7394-1-git-send-email-quic_mojha@quicinc.com/
>
> Minidump is a best effort mechanism to collect useful and predefined data
> for first level of debugging on end user devices running on Qualcomm SoCs.
> It is built on the premise that System on Chip (SoC) or subsystem part of
> SoC crashes, due to a range of hardware and software bugs.
>
> Qualcomm devices in engineering mode provides a mechanism for generating
> full system ramdumps for post mortem debugging. But in some cases it's
> however not feasible to capture the entire content of RAM. The minidump
> mechanism provides the means for selecting which snippets should be
> included in the ramdump.
>
> The core of SMEM based minidump feature is part of Qualcomm's boot
> firmware code. It initializes shared memory (SMEM), which is a part of
> DDR and allocates a small section of SMEM to minidump table i.e also
> called global table of content (G-ToC). Each subsystem (APSS, ADSP, ...)
> has their own table of segments to be included in the minidump and all
> get their reference from G-ToC. Each segment/region has some details
> like name, physical address and it's size etc. and it could be anywhere
> scattered in the DDR.
>
> Existing upstream Qualcomm remoteproc driver[1] already supports SMEM
> based minidump feature for remoteproc instances like ADSP, MODEM, ...
> where predefined selective segments of subsystem region can be dumped
> as part of coredump collection which generates smaller size artifacts
> compared to complete coredump of subsystem on crash.
>
> [1]
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/drivers/remoteproc/qcom_common.c#n142
>
> In addition to managing and querying the APSS minidump description,
> the Linux driver maintains a ELF header in a segment. This segment
> gets updated with section/program header whenever a new entry gets
> registered.
>
> Support for Minidump enablement on Qualcomm SoCs is pursued separately and
> can be done via below series of changes. For testing, these patches can be
> applied
>
> https://lore.kernel.org/lkml/1704727654-13999-1-git-send-email-quic_mojha@quicinc.com/
>
> https://lore.kernel.org/lkml/20240109153200.12848-12-quic_mojha@quicinc.com/
> https://lore.kernel.org/lkml/20240109153200.12848-13-quic_mojha@quicinc.com/
>
> Testing of these patches has been done on sm8450 target after enabling kernel
> config like CONFIG_PSTORE_RAM/CONFIG_PSTORE_CONSOLE and once the device boots
> up. Below command can be executed from sysfs to enable minidump in the firmware.
>
> echo mini > /sys/module/qcom_scm/parameters/download_mode
>
> Try crashing it via devmem2 0xf11c000(this is known command to create xpu violation
> and put the device crash dump mode) on command prompt.
>
> Default storage type is set to via USB, so Minidump would be downloaded with the
> help of x86_64 machine (running PCAT tool) attached to Qualcomm product which has
> backed Minidump boot firmware support.
>
> After that we will see a bunch of predefined registered region as binary blobs files
> starts with md_* downloaded on the x86 machine at configured/default location in PCAT
> tool from the product, more about this can be found in qualcomm minidump guide
> patch.
>
> Mukesh Ojha (10):
> docs: qcom: Add qualcomm minidump guide
> soc: qcom: Add qcom_rproc_minidump module
> remoteproc: qcom_q6v5_pas: Use qcom_rproc_minidump()
> remoteproc: qcom: Remove minidump related data from qcom_common.c
> init: export linux_banner data variable
> soc: qcom: Add Qualcomm APSS minidump kernel driver
> MAINTAINERS: Add entry for minidump related files
> pstore/ram: Add dynamic ramoops region support through commandline
> pstore/ram: Add ramoops information notifier support
> soc: qcom: register ramoops region with APSS minidump
>
> Documentation/admin-guide/index.rst | 1 +
> Documentation/admin-guide/qcom_minidump.rst | 318 +++++++++
> Documentation/admin-guide/ramoops.rst | 23 +-
> MAINTAINERS | 10 +
> drivers/remoteproc/Kconfig | 1 +
> drivers/remoteproc/qcom_common.c | 160 -----
> drivers/remoteproc/qcom_q6v5_pas.c | 3 +-
> drivers/soc/qcom/Kconfig | 23 +
> drivers/soc/qcom/Makefile | 2 +
> drivers/soc/qcom/qcom_minidump.c | 690 ++++++++++++++++++++
> drivers/soc/qcom/qcom_minidump_internal.h | 74 +++
> drivers/soc/qcom/qcom_rproc_minidump.c | 111 ++++
> drivers/soc/qcom/smem.c | 20 +
> fs/pstore/Kconfig | 15 +
> fs/pstore/ram.c | 180 ++++-
> include/linux/init.h | 3 +
> include/linux/pstore_ram.h | 20 +
> include/linux/soc/qcom/smem.h | 2 +
> include/soc/qcom/qcom_minidump.h | 41 ++
> init/main.c | 3 +
> init/version-timestamp.c | 3 +
> 21 files changed, 1538 insertions(+), 165 deletions(-)
> create mode 100644 Documentation/admin-guide/qcom_minidump.rst
> create mode 100644 drivers/soc/qcom/qcom_minidump.c
> create mode 100644 drivers/soc/qcom/qcom_minidump_internal.h
> create mode 100644 drivers/soc/qcom/qcom_rproc_minidump.c
> create mode 100644 include/soc/qcom/qcom_minidump.h
>
>
> base-commit: 41d66f96d0f15a0a2ad6fa2208f6bac1a66cbd52
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