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.
The last 3 patches in the series also exposes the device connections via sysfs by symlinks to indicate the trace data paths.
Patches 01 - 05 : General cleanups and a fix. Patches 06 - 13 : Cleanup the drivers for tracking the CoreSight device instead of the parent device. Patches 14 - 20 : Introduce platform agnostic APIs for firmware data probing. Patches 21 - 26 : Prepare for reusing and freeing up the platform data description for device connections and references. Patches 27 - 30 : Use fwnode handles and introduce generic naming scheme. Patches 31 - 33 : Introduce ACPI bindings support Patches 34 - 36 : RFC - expose device connections via sysfs
Applies on Mathieu's coresight/next tree.
Tested on a Juno-r0 board with ACPI bindings patch (Patch 37/36) 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-top... [1] https://developer.arm.com/docs/den0067/latest/acpi-for-coresighttm-10-platfo... [2] https://github.com/tianocore/edk2-platforms.git
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.
Suzuki K Poulose (36): coresight: Fix freeing up the coresight connections coresight: etb10: Cleanup power management coresight: tpiu: Cleanup power management coresight: catu: Cleanup power management coresight: tmc: Cleanup power management 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: 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 drivers: Add a generic helper to match device by fwnode handle 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 components [RFC] coresight: Pass coresight_device for coresight_release_platform_data [RFC] coresight: add return value for fixup connections [RFC] coresight: Expose device connections via sysfs
drivers/acpi/acpi_amba.c | 9 + drivers/base/devcon.c | 5 - drivers/base/property.c | 6 + drivers/hwtracing/coresight/Makefile | 3 +- drivers/hwtracing/coresight/coresight-catu.c | 43 +- drivers/hwtracing/coresight/coresight-catu.h | 1 - drivers/hwtracing/coresight/coresight-cpu-debug.c | 3 +- drivers/hwtracing/coresight/coresight-etb10.c | 65 +- 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 | 36 +- drivers/hwtracing/coresight/coresight-etm4x.h | 2 - drivers/hwtracing/coresight/coresight-funnel.c | 27 +- drivers/hwtracing/coresight/coresight-platform.c | 740 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight-priv.h | 3 + drivers/hwtracing/coresight/coresight-replicator.c | 37 +- drivers/hwtracing/coresight/coresight-stm.c | 110 ++- drivers/hwtracing/coresight/coresight-tmc-etf.c | 9 +- drivers/hwtracing/coresight/coresight-tmc-etr.c | 44 +- drivers/hwtracing/coresight/coresight-tmc.c | 100 +-- drivers/hwtracing/coresight/coresight-tmc.h | 1 - drivers/hwtracing/coresight/coresight-tpiu.c | 30 +- drivers/hwtracing/coresight/coresight.c | 291 ++++++-- drivers/hwtracing/coresight/of_coresight.c | 297 --------- include/linux/coresight.h | 65 +- include/linux/property.h | 1 + 27 files changed, 1378 insertions(+), 613 deletions(-) create mode 100644 drivers/hwtracing/coresight/coresight-platform.c delete mode 100644 drivers/hwtracing/coresight/of_coresight.c
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(+)