Date:   Tue, 28 May 2019 11:36:07 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Coresight ML <coresight@...ts.linaro.org>
Subject: Re: [PATCH v4 00/30] coresight: Support for ACPI bindings

On Tue, 28 May 2019 at 11:32, Mathieu Poirier
<mathieu.poirier@...aro.org> wrote:
>
> On Wed, 22 May 2019 at 04:35, Suzuki K Poulose <suzuki.poulose@....com> wrote:
> >
> > This series adds the support for CoreSight devices on ACPI based
> > platforms. The device connections are encoded as _DSD graph property[0],
> > with CoreSight specific extensions to indicate the direction of data
> > flow as described in [1]. Components attached to CPUs are listed
> > as child devices of the corresponding CPU, removing explicit links
> > to the CPU like we do in the DT.
> >
> > The majority of the series cleans up the driver and prepares the subsystem
> > for platform agnostic firwmare probing, naming scheme, searching etc.
> >
> > We introduce platform independent helpers to parse the platform supplied
> > information. Thus we rename the platform handling code from:
> >         of_coresight.c  => coresight-platform.c
> >
> > The CoreSight driver creates shadow devices that appear on the Coresight
> > bus, in addition to the real devices (e.g, AMBA bus devices). The name
> > of these devices match the real device. This makes the device name
> > a bit cryptic for ACPI platform. So this series also introduces a generic
> > platform agnostic device naming scheme for the shadow Coresight devices.
> > Towards this we also make changes to the way we lookup devices to resolve
> > the connections, as we can't use the names to identify the devices. So,
> > we use the "fwnode_handle" of the real device for the device lookups.
> > Towards that we clean up the drivers to keep track of the "CoreSight"
> > device rather than the "real" device. However, all real operations,
> > like DMA allocation, Power management etc. must be performed on
> > the real device which is the parent of the shadow device.
> >
> > Finally we add the support for parsing the ACPI platform data. The power
> > management support is missing in the ACPI (and this is not specific to
> > CoreSight). The firmware must ensure that the respective power domains
> > are turned on.
> >
> > Applies on v5.2-rc1
> >
> > Tested on a Juno-r0 board with ACPI bindings patch (Patch 31/30) added on
> > top of [2]. You would need to make sure that the debug power domain is
> > turned on before the Linux kernel boots. (e.g, connect the DS-5 to the
> > Juno board while at UEFI). arm32 code is only compile tested.
> >
> > [0] ACPI Device Graphs using _DSD (Not available online yet, approved but
> >     awaiting publish and eventually should be linked at).
> >     https://uefi.org/sites/default/files/resources/_DSD-implementation-guide-toplevel-1_1.htm
> > [1] https://developer.arm.com/docs/den0067/latest/acpi-for-coresighttm-10-platform-design-document
> > [2] https://github.com/tianocore/edk2-platforms.git
> >
> > Changes since v3:
> >  - Add tags from Mathieu
> >
> > Changes since v2:
> >  - Fix the symlink name for ETM devices under cs_etm PMU (Patch by Mathieu)
> >  - Drop patches merged already in the tree.
> >  - Add the tags from Mathieu
> >  - More documentation with examples of ACPI graph in ACPI bindings support.
> >  - Fix ETM4 error return path (Mathieu)
> >  - Drop the patches exposing device links via sysfs, to be posted as separate
> >    series.
> >  - Drop the generic helper for device search by fwnode for a better cleanup
> >    later.
> >  - Split the ACPI bindings support patch for AMBA and platform devices.
> >  - Return integer error for <platform>_get_platform_data() helpers.
> >  - Fix comment about the return code for acpi_get_coresight_cpu().
> >  - Ensure we don't have devices part of multiple graphs (Mathieu).
> >
> > Changes since v1:
> >
> >  [ http://lists.infradead.org/pipermail/linux-arm-kernel/2019-March/639963.html ]
> >
> >   - Dropped the replicator driver merge changes as they were pulled already.
> >   - Cleanups for Power management in the drivers.
> >   - Reuse platform description for connection information. Also introduce
> >     routines to clean up the platform description to make sure we drop
> >     the references (fwnode_handle).
> >   - Add RFC patches for exposing the device-links via sysfs.
> >   - Drop tracking the device in favour of coresight_device.
> >   - Name etb10 as "etb"
> >   - Fix other comments in v1.
> >   - Use a generic helper for searching with fwnode_handle rather than adding
> >     one for CoreSight.
> >
> >
> > Mathieu Poirier (1):
> >   coresight: Use coresight device names for sinks in PMU attribute
> >
> > Suzuki K Poulose (29):
> >   coresight: funnel: Clean up device book keeping
> >   coresight: replicator: Cleanup device tracking
> >   coresight: tmc: Clean up device specific data
> >   coresight: catu: Cleanup device specific data
> >   coresight: tpiu: Clean up device specific data
> >   coresight: stm: Cleanup device specific data
> >   coresight: etm: Clean up device specific data
> >   coresight: etb10: Clean up device specific data
> >   coresight: Rename of_coresight to coresight-platform
> >   coresight: etm3x: Rearrange cp14 access detection
> >   coresight: stm: Rearrange probing the stimulus area
> >   coresight: tmc-etr: Rearrange probing default buffer size
> >   coresight: platform: Make memory allocation helper generic
> >   coresight: Make sure device uses DT for obsolete compatible check
> >   coresight: Introduce generic platform data helper
> >   coresight: Make device to CPU mapping generic
> >   coresight: Remove cpu field from platform data
> >   coresight: Remove name from platform description
> >   coresight: Cleanup coresight_remove_conns
> >   coresight: Reuse platform data structure for connection tracking
> >   coresight: Rearrange platform data probing
> >   coresight: Add support for releasing platform specific data
> >   coresight: platform: Use fwnode handle for device search
> >   coresight: Use fwnode handle instead of device names
> >   coresight: Use platform agnostic names
> >   coresight: stm: ACPI support for parsing stimulus base
> >   coresight: Support for ACPI bindings
> >   coresight: acpi: Support for AMBA components
> >   coresight: acpi: Support for platform devices
> >
> >  drivers/acpi/acpi_amba.c                           |   9 +
> >  drivers/hwtracing/coresight/Makefile               |   3 +-
> >  drivers/hwtracing/coresight/coresight-catu.c       |  40 +-
> >  drivers/hwtracing/coresight/coresight-catu.h       |   1 -
> >  drivers/hwtracing/coresight/coresight-cpu-debug.c  |   3 +-
> >  drivers/hwtracing/coresight/coresight-etb10.c      |  51 +-
> >  drivers/hwtracing/coresight/coresight-etm-perf.c   |   8 +-
> >  drivers/hwtracing/coresight/coresight-etm.h        |   6 +-
> >  .../hwtracing/coresight/coresight-etm3x-sysfs.c    |  12 +-
> >  drivers/hwtracing/coresight/coresight-etm3x.c      |  45 +-
> >  drivers/hwtracing/coresight/coresight-etm4x.c      |  37 +-
> >  drivers/hwtracing/coresight/coresight-etm4x.h      |   2 -
> >  drivers/hwtracing/coresight/coresight-funnel.c     |  35 +-
> >  drivers/hwtracing/coresight/coresight-platform.c   | 810 +++++++++++++++++++++
> >  drivers/hwtracing/coresight/coresight-priv.h       |   4 +
> >  drivers/hwtracing/coresight/coresight-replicator.c |  42 +-
> >  drivers/hwtracing/coresight/coresight-stm.c        | 118 ++-
> >  drivers/hwtracing/coresight/coresight-tmc-etf.c    |   9 +-
> >  drivers/hwtracing/coresight/coresight-tmc-etr.c    |  44 +-
> >  drivers/hwtracing/coresight/coresight-tmc.c        |  96 +--
> >  drivers/hwtracing/coresight/coresight-tmc.h        |   2 -
> >  drivers/hwtracing/coresight/coresight-tpiu.c       |  24 +-
> >  drivers/hwtracing/coresight/coresight.c            | 164 ++++-
> >  drivers/hwtracing/coresight/of_coresight.c         | 297 --------
> >  include/linux/coresight.h                          |  61 +-
> >  25 files changed, 1332 insertions(+), 591 deletions(-)
> >  create mode 100644 drivers/hwtracing/coresight/coresight-platform.c
> >  delete mode 100644 drivers/hwtracing/coresight/of_coresight.c
>
> I have applied this set.

As Leo pointed out it would be interesting to update the documentation
in "Documentation/trace/coresight.txt".

>
> Thanks,
> Mathieu
>
> >
> > ACPI bindings for Juno-r0 (applies on [2] above)
> >
> > Suzuki K Poulose (1):
> >   edk2-platform: juno: Update ACPI CoreSight Bindings
> >
> >  Platform/ARM/JunoPkg/AcpiTables/Dsdt.asl | 241 +++++++++++++++++++++++++++++++
> >  1 file changed, 241 insertions(+)
> >
> > --
> > 2.7.4
> >

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