This patchset adds support for the CoreSight STM IP block. In this fourth version, comments from various people have been addressed. Representing configurations where channels are shared between multiple masterIDs has been kept unchanged from the previous version because a viable alternative hasn't been suggested. Changes from V3: - Removed ioctl get_options interface from the generic STM code and CoreSight STM driver. - Removed 'write_max' from the structure 'stm_drvdata', and changed 'write_64bit' to 'write_bytes'. - Revised stm_fundamental_data_size() to return the fundamental data size instead of 0/1. - Removed stm_remove() from the driver. - Revised the return value of ::packet() callback function according to [2]. - Modified stm_send() to send one STP packet at a time. - Added comments to invariant/guaranteed CoreSight STM transaction mode. Changes from V2: - Changed to return -EFAULT if failed on the command STP_GET_OPTIONS. - Used Alex's patch [1] instead of the last 2/6. - Removed the while loop from stm_send(), since the packet size passed to it isn't larger than 4 bytes on 32-bit system and 8 bytes on 64-bit system. - Removed stm_send_64bit(), since the process of packets on 64-bit CS-STM should be basically the same with on 32-bit system, except the maximum length of writing STM at a time. - Removed the support of writing 64-bit to CoreSight STM buffer at a time on 32-bit ARM architecture according to an ARM engineer suggestion. As he said that the STM might receive a 64-bit write, or might receive a pair of 32-bit writes to the two addressed words in either order. So 64-bit write isn't guaranteed to work on the ARM 32-bit architecture. Changes from v1: - Added a definition of coresight_simple_func() in CS-STM driver to avoid the kbuild test robot error for the time being. This modification will be removed when merging the code in which the coresight_simple_func() has been moved to the header file. - Calculate the channel number according to the channel memory space size. Thanks, Chunyan [1] https://lkml.org/lkml/2016/2/4/652 [2] https://lkml.org/lkml/2016/2/12/397 Chunyan Zhang (1): Documentations: Add explanations of the case for non-configurable masters Mathieu Poirier (2): stm class: provision for statically assigned masterIDs coresight-stm: Bindings for System Trace Macrocell Pratik Patel (1): coresight-stm: adding driver for CoreSight STM component .../ABI/testing/sysfs-bus-coresight-devices-stm | 53 ++ .../devicetree/bindings/arm/coresight.txt | 28 + Documentation/trace/coresight.txt | 37 +- Documentation/trace/stm.txt | 6 + drivers/hwtracing/coresight/Kconfig | 11 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-stm.c | 890 +++++++++++++++++++++ drivers/hwtracing/stm/core.c | 18 +- drivers/hwtracing/stm/policy.c | 18 +- include/linux/coresight-stm.h | 6 + include/linux/stm.h | 8 + include/uapi/linux/coresight-stm.h | 21 + 12 files changed, 1091 insertions(+), 6 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-bus-coresight-devices-stm create mode 100644 drivers/hwtracing/coresight/coresight-stm.c create mode 100644 include/linux/coresight-stm.h create mode 100644 include/uapi/linux/coresight-stm.h -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
