Add support for the Coresight Address Translation Unit (CATU), which provides improved scatter-gather functionality for TMC-ETR. The CATU performs address translation for ETR based on a page table, which contains address of 4KB sized data pages, but uses a different format from that of the TMC-ETR SG table. The page table format is described in the code. See patch "coresight: catu: Add support for scatter gather tables" The CATU devices do not appear on the "software" path for given trace session, to leave the management of the device to the driving TMC-ETR, depending on the mode of the buffer. Towards this we introduce a new class of coresight device_type, helper devices. These helper devices are managed by the master devices. The build-path operation takes care of making sure that any helper device associated with a device is turned on. Applies on Mathieu's coresight/next tree. This series is, part 2 of the split of the series [0]. Changes since v1: - Rename the variables in CATU page table populate for better readability. - Fix broken commit description. - Fix the order of "wait for ready" & "disable hw" in catu_disable_hw. Changes since [0] : - Remove "restore" buf support and trim down the page table populate code to get rid of "range" updates. - Do not create a circular table by default. - Fix style issues - Set DMA mask for CATU based on the address width. - Rename : coresight_prepare_device => coresight_grab_device coresight_release_device => coresight_drop_device to avoid confusing with coresight_device_release(). [0] - TMC ETR perf support - http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/574875.html Suzuki K Poulose (6): coresight: Cleanup device subtype struct coresight: Add helper device type coresight: Introduce support for Coresight Address Translation Unit dts: bindings: Document device tree binding for CATU coresight: catu: Add support for scatter gather tables coresight: catu: Plug in CATU as a backend for ETR buffer .../devicetree/bindings/arm/coresight.txt | 53 ++ drivers/hwtracing/coresight/Kconfig | 11 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-catu.c | 577 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight-catu.h | 120 +++++ drivers/hwtracing/coresight/coresight-tmc-etr.c | 71 ++- drivers/hwtracing/coresight/coresight-tmc.h | 3 + drivers/hwtracing/coresight/coresight.c | 43 +- include/linux/coresight.h | 46 +- 9 files changed, 911 insertions(+), 14 deletions(-) create mode 100644 drivers/hwtracing/coresight/coresight-catu.c create mode 100644 drivers/hwtracing/coresight/coresight-catu.h -- 2.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
