This patchset adds support for the CoreSight STM IP block. Changes from V4: - Rebased the whole patch set onto [4] (v4.6-rc1). - Made a few minor modifications according to the code changes since v4.5. - Replaced the original 1/4 with a new patch the Alex provided. - Another new patch 2/4 in this set is for storing path from CS-STM to sink. - Addressed comments from V4. - Removed coresight_simple_func() from CS-STM driver, used the common definition instead. - Modified STM tracer-id from an arbitrary value 0x20 to 0x1. - Replaced module_amba_driver() with builtin_amba_driver() according to [5]. - Used driver->suppress_bind_attr to prevent CS-STM being unbound from the driver. - Updated the kernel version (4.7) and month in sysfs-bus-coresight-devices-stm. - Replaced 'mshared' with 'hw_override' in CS-STM driver. - Initialized sw_start and sw_end with 1. - Returned a size of '1' after processing FLAG packets. - Removed pre-compile option 'CONFIG_64BIT' for the packet size of 8. - Added Michael Williams's Reviewed-by in 4/4. 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 [3] https://lkml.org/lkml/2015/12/22/348 [4] https://git.linaro.org/kernel/coresight.git/shortlog/refs/heads/next [5] http://www.spinics.net/lists/kernel/msg2187320.html Alexander Shishkin (1): stm class: Support devices that override software assigned masters Mathieu Poirier (2): coresight: adding path for STM device 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 ++ Documentation/ABI/testing/sysfs-class-stm | 10 + .../devicetree/bindings/arm/coresight.txt | 28 + Documentation/trace/coresight.txt | 37 +- drivers/hwtracing/coresight/Kconfig | 11 + drivers/hwtracing/coresight/Makefile | 1 + drivers/hwtracing/coresight/coresight-stm.c | 918 +++++++++++++++++++++ drivers/hwtracing/coresight/coresight.c | 106 ++- drivers/hwtracing/stm/core.c | 15 + include/linux/coresight-stm.h | 6 + include/linux/stm.h | 3 + include/uapi/linux/coresight-stm.h | 21 + 12 files changed, 1183 insertions(+), 26 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
