Removing maxime.coque...@st.com since it seems an unreachable address
On Tue, Aug 9, 2016 at 2:32 PM, Chunyan Zhang <zhang.chun...@linaro.org> wrote: > IP blocks allowing a variety of trace sources to log debugging > information to a pre-defined area have been introduced on a couple of > architecture [1][2]. These system trace blocks (also known as STM) > typically follow the MIPI STPv2 protocol [3] and provide a system wide > logging facility to any device, running a kernel or not, with access > to the block's log entry port(s). Since each trace message has a > timestamp, it is possible to correlate events happening in the entire > system rather than being confined to the logging facility of a single > entity. > > This patchset is trying to use STM IP blocks to store some function > tracing information produced by Ftrace and I'm taking the Function trace > (TRACE_FN) as the example in this patchset, but other types of traces > also can be supported. > > Logging information generated by the function trace subsystem > and gathered in the coresight sink can be used in conjunction with > trace data from other board components, also collected in the same > trace sink. This example is using ARM coresight STM but the same would > apply to any architecture wishing to do the same. > > In this patchset made many modifications according to the comments on > last patchset, the first two patches of this serial have been midified > completely. This patchset implemented the similar features, but in the > completely different way. > > Comments and advice would be greatly appreciated. > > Thanks, > Chunyan > > [1]. https://lwn.net/Articles/674746/ > [2]. http://lxr.free-electrons.com/source/drivers/hwtracing/intel_th/ > [3]. http://mipi.org/specifications/debug#STP > > Changes v3: > * Rebased on v4.8-rc1. > * Added trace_export class, and make traces can be exported to not only > ring buffer but also other area such as STM. > * Made stm_ftrace as an trace_export. > * More detailed changes are described in change log of each patch. > > Changes v2: > * Addressed comments from Alexander Shishkin: > - Modified some ambiguous change logs. > - Decoupled stm_ftrace and trace_output interface to STM. > - Changed the file name from stm_ftrace.c to stm/ftrace.c. > - Implemented link/unlink hooks for stm_ftrace. > * Removed useless header file include from stm/ftrace.c > * Added Acked-by from Steven Rostedt on 4/4. > > Chunyan Zhang (3): > tracing: add a possibility of exporting function trace to other places > instead of ring buffer only > stm class: ftrace: Add ftrace-export-over-stm driver > stm: Mark the functions of writing buffer with notrace > > drivers/hwtracing/coresight/coresight-stm.c | 2 +- > drivers/hwtracing/intel_th/sth.c | 11 ++- > drivers/hwtracing/stm/Kconfig | 11 +++ > drivers/hwtracing/stm/Makefile | 2 + > drivers/hwtracing/stm/core.c | 7 +- > drivers/hwtracing/stm/dummy_stm.c | 2 +- > drivers/hwtracing/stm/ftrace.c | 87 +++++++++++++++++++ > include/linux/stm.h | 4 +- > include/linux/trace.h | 31 +++++++ > kernel/trace/trace.c | 124 > +++++++++++++++++++++++++++- > kernel/trace/trace.h | 31 +++++++ > 11 files changed, 300 insertions(+), 12 deletions(-) > create mode 100644 drivers/hwtracing/stm/ftrace.c > create mode 100644 include/linux/trace.h > > -- > 2.7.4 >
