[PATCH V5 0/4] Introduce CoreSight STM support

[Chunyan Zhang]

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