Re: [PATCH v3 00/13] Introduce PECI subsystem

["Winiarska, Iwona" <iwona.winiarska@intel.com>]

On Thu, 2021-11-18 at 14:19 +0200, Tomer Maimon wrote:
> Hi Iwona,
> 
> My name is Tomer I working as a SW engineer in Nuvoton BMC project.
> 
> First, thanks for upstreaming the PECI driver!
> 
> Nuvoton (NPCM) PECI driver was in the PECI patchset that has been handheld by
> Jae.
> https://patchwork.kernel.org/project/linux-arm-kernel/patch/20191211194624.2872-10-jae.hyun.yoo@linux.intel.com/
> 
> Could you add Nuvoton (NPCM) PECI driver to your patch set next time you will
> send upstream patches to Linux vanilla?

Some (relatively small) changes are going to be needed to adapt that driver to
changes that happened in PECI core.
I want to keep this series as small as possible, but once it gets merged,
Nuvoton driver can be added in a separate series.

> If you agree, we will check your patchset in Nuvoton systems in a few days and
> send you NPCM OECI driver and documentation.
> 

I don't have any hardware to test it on so help will definitely be welcome :)

Thanks
-Iwona

> Thanks,
> 
> Tomer
> 
> On Mon, 15 Nov 2021 at 20:28, Iwona Winiarska <iwona.winiarska@intel.com> wrote:
> > Hi,
> > 
> > This is a third round of patches introducing PECI subsystem.
> > Sorry for the delay between v2 and v3.
> > 
> > The Platform Environment Control Interface (PECI) is a communication
> > interface between Intel processors and management controllers (e.g.
> > Baseboard Management Controller, BMC).
> > 
> > This series adds a PECI subsystem and introduces drivers which run in
> > the Linux instance on the management controller (not the main Intel
> > processor) and is intended to be used by the OpenBMC [1], a Linux
> > distribution for BMC devices.
> > The information exposed over PECI (like processor and DIMM
> > temperature) refers to the Intel processor and can be consumed by
> > daemons running on the BMC to, for example, display the processor
> > temperature in its web interface.
> > 
> > The PECI bus is collection of code that provides interface support
> > between PECI devices (that actually represent processors) and PECI
> > controllers (such as the "peci-aspeed" controller) that allow to
> > access physical PECI interface. PECI devices are bound to PECI
> > drivers that provides access to PECI services. This series introduces
> > a generic "peci-cpu" driver that exposes hardware monitoring "cputemp"
> > and "dimmtemp" using the auxiliary bus.
> > 
> > Exposing "raw" PECI to userspace, either to write userspace drivers or
> > for debug/testing purpose was left out of this series to encourage
> > writing kernel drivers instead, but may be pursued in the future.
> > 
> > Introducing PECI to upstream Linux was already attempted before [2].
> > Since it's been over a year since last revision, and the series
> > changed quite a bit in the meantime, I've decided to start from v1.
> > 
> > I would also like to give credit to everyone who helped me with
> > different aspects of preliminary review:
> > - Pierre-Louis Bossart,
> > - Tony Luck, 
> > - Andy Shevchenko,
> > - Dave Hansen.
> > 
> > [1] https://github.com/openbmc/openbmc
> > [2]
> > https://lore.kernel.org/openbmc/20191211194624.2872-1-jae.hyun.yoo@linux.intel.com/
> > 
> > Changes v2 -> v3:
> > 
> > * Dropped x86/cpu patches (Boris)
> > * Dropped pr_fmt() for PECI module (Dan)
> > * Fixed releasing peci controller device flow (Dan) 
> > * Improved peci-aspeed commit-msg and Kconfig help (Dan)
> > * Fixed aspeed_peci_xfer() to use the proper spin_lock function (Dan) 
> > * Wrapped print_hex_dump_bytes() in CONFIG_DYNAMIC_DEBUG (Dan)
> > * Removed debug status logs from aspeed_peci_irq_handler() (Dan)
> > * Renamed functions using devres to start with "devm" (Dan)
> > * Changed request to be allocated on stack in peci_detect (Dan)
> > * Removed redundant WARN_ON on invalid PECI addr (Dan)
> > * Changed peci_device_create() to use device_initialize() + device_add()
> > pattern (Dan)
> > * Fixed peci_device_destroy() to use kill_device() avoiding double-free (Dan)
> > * Renamed functions that perform xfer using "peci_xfer_*" prefix (Dan) 
> > * Renamed peci_request_data_dib(temp) -> peci_request_dib(temp)_read (Dan)
> > * Fixed thermal margin readings for older Intel processors (Zev) 
> > * Misc hwmon simplifications (Guenter)
> > * Used BIT_PER_TYPE to verify macro value constrains (Guenter)
> > * Improved WARN_ON message to print chan_rank_max and idx_dimm_max (Guenter)
> > * Improved dimmtemp to not reattempt probe if no dimms are populated
> > 
> > Changes v1 -> v2:
> > 
> > Biggest changes when it comes to diffstat are locking in HWMON
> > (I decided to clean things up a bit while adding it), switching to
> > devres usage in more places and exposing sysfs interface in separate patch.
> > 
> > * Moved extending X86 ARCHITECTURE MAINTAINERS earlier in series (Dan)
> > * Removed "default n" for GENERIC_LIB_X86 (Dan)
> > * Added vendor prefix for peci-aspeed specific properties (Rob)
> > * Refactored PECI to use devres consistently (Dan)
> > * Added missing sysfs documentation and excluded adding peci-sysfs to
> >   separate patch (Dan)
> > * Used module_init() instead of subsys_init() for peci module initialization
> > (Dan)
> > * Removed redundant struct peci_device member (Dan)
> > * Improved PECI Kconfig help (Randy/Dan)
> > * Fixed/removed log messages (Dan, Guenter)
> > * Refactored peci-cputemp and peci-dimmtemp and added missing locks (Guenter)
> > * Removed unused dev_set_drvdata() in peci-cputemp and peci-dimmtemp (Guenter)
> > * Fixed used types, names, fixed broken and added additional comments
> >   to peci-hwmon (Guenter, Zev)
> > * Refactored peci-dimmtemp to not return -ETIMEDOUT (Guenter)
> > * Added sanity check for min_peci_revision in peci-hwmon drivers (Zev)
> > * Added assert for DIMM_NUMS_MAX and additional warning in peci-dimmtemp (Zev)
> > * Fixed macro names in peci-aspeed (Zev)
> > * Refactored peci-aspeed sanitizing properties to a single helper function
> > (Zev)
> > * Fixed peci_cpu_device_ids definition for Broadwell Xeon D (David)
> > * Refactor peci_request to use a single allocation (Zev)
> > * Used min_t() to improve code readability (Zev)
> > * Added macro for PECI_RDENDPTCFG_MMIO_WR_LEN_BASE and fixed adev type
> >   array name to more descriptive (Zev)
> > * Fixed peci-hwmon commit-msg and documentation (Zev)
> > 
> > Thanks
> > -Iwona
> > 
> > Iwona Winiarska (11):
> >   dt-bindings: Add generic bindings for PECI
> >   dt-bindings: Add bindings for peci-aspeed
> >   ARM: dts: aspeed: Add PECI controller nodes
> >   peci: Add core infrastructure
> >   peci: Add device detection
> >   peci: Add sysfs interface for PECI bus
> >   peci: Add support for PECI device drivers
> >   peci: Add peci-cpu driver
> >   hwmon: peci: Add cputemp driver
> >   hwmon: peci: Add dimmtemp driver
> >   docs: Add PECI documentation
> > 
> > Jae Hyun Yoo (2):
> >   peci: Add peci-aspeed controller driver
> >   docs: hwmon: Document PECI drivers
> > 
> >  Documentation/ABI/testing/sysfs-bus-peci      |  16 +
> >  .../devicetree/bindings/peci/peci-aspeed.yaml | 109 +++
> >  .../bindings/peci/peci-controller.yaml        |  33 +
> >  Documentation/hwmon/index.rst                 |   2 +
> >  Documentation/hwmon/peci-cputemp.rst          |  90 +++
> >  Documentation/hwmon/peci-dimmtemp.rst         |  57 ++
> >  Documentation/index.rst                       |   1 +
> >  Documentation/peci/index.rst                  |  16 +
> >  Documentation/peci/peci.rst                   |  51 ++
> >  MAINTAINERS                                   |  29 +
> >  arch/arm/boot/dts/aspeed-g4.dtsi              |  14 +
> >  arch/arm/boot/dts/aspeed-g5.dtsi              |  14 +
> >  arch/arm/boot/dts/aspeed-g6.dtsi              |  14 +
> >  drivers/Kconfig                               |   3 +
> >  drivers/Makefile                              |   1 +
> >  drivers/hwmon/Kconfig                         |   2 +
> >  drivers/hwmon/Makefile                        |   1 +
> >  drivers/hwmon/peci/Kconfig                    |  31 +
> >  drivers/hwmon/peci/Makefile                   |   7 +
> >  drivers/hwmon/peci/common.h                   |  58 ++
> >  drivers/hwmon/peci/cputemp.c                  | 592 ++++++++++++++++
> >  drivers/hwmon/peci/dimmtemp.c                 | 630 ++++++++++++++++++
> >  drivers/peci/Kconfig                          |  36 +
> >  drivers/peci/Makefile                         |  10 +
> >  drivers/peci/controller/Kconfig               |  17 +
> >  drivers/peci/controller/Makefile              |   3 +
> >  drivers/peci/controller/peci-aspeed.c         | 429 ++++++++++++
> >  drivers/peci/core.c                           | 236 +++++++
> >  drivers/peci/cpu.c                            | 343 ++++++++++
> >  drivers/peci/device.c                         | 249 +++++++
> >  drivers/peci/internal.h                       | 136 ++++
> >  drivers/peci/request.c                        | 482 ++++++++++++++
> >  drivers/peci/sysfs.c                          |  82 +++
> >  include/linux/peci-cpu.h                      |  40 ++
> >  include/linux/peci.h                          | 110 +++
> >  35 files changed, 3944 insertions(+)
> >  create mode 100644 Documentation/ABI/testing/sysfs-bus-peci
> >  create mode 100644 Documentation/devicetree/bindings/peci/peci-aspeed.yaml
> >  create mode 100644 Documentation/devicetree/bindings/peci/peci-
> > controller.yaml
> >  create mode 100644 Documentation/hwmon/peci-cputemp.rst
> >  create mode 100644 Documentation/hwmon/peci-dimmtemp.rst
> >  create mode 100644 Documentation/peci/index.rst
> >  create mode 100644 Documentation/peci/peci.rst
> >  create mode 100644 drivers/hwmon/peci/Kconfig
> >  create mode 100644 drivers/hwmon/peci/Makefile
> >  create mode 100644 drivers/hwmon/peci/common.h
> >  create mode 100644 drivers/hwmon/peci/cputemp.c
> >  create mode 100644 drivers/hwmon/peci/dimmtemp.c
> >  create mode 100644 drivers/peci/Kconfig
> >  create mode 100644 drivers/peci/Makefile
> >  create mode 100644 drivers/peci/controller/Kconfig
> >  create mode 100644 drivers/peci/controller/Makefile
> >  create mode 100644 drivers/peci/controller/peci-aspeed.c
> >  create mode 100644 drivers/peci/core.c
> >  create mode 100644 drivers/peci/cpu.c
> >  create mode 100644 drivers/peci/device.c
> >  create mode 100644 drivers/peci/internal.h
> >  create mode 100644 drivers/peci/request.c
> >  create mode 100644 drivers/peci/sysfs.c
> >  create mode 100644 include/linux/peci-cpu.h
> >  create mode 100644 include/linux/peci.h
> >