Date:   Tue, 28 May 2019 11:32:11 -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 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.

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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