[PATCH 0/9 v2] Coresight framework and drivers
mathieu.poirier at linaro.org
Wed Jul 2 12:32:42 PDT 2014
On 1 July 2014 04:32, Al Grant <Al.Grant at arm.com> wrote:
>> This set is addressing comments received after the May 30th
>> submission. More specifically:
>> .All drivers have been converted to use the AMBA bus
>> .Debugfs entries are now created with a macro.
>> .A header file was created for the ETM driver to allow
>> for the reuse of constant definition.
>> .Error path on some drivers have been corrected.
>> .All types converted from uintX_t to uX.
>> .All numeric constant have been replaced with #defines and
>> comments added where necessary.
>> .Removal of "coresight-id" and "coresigh-name" DT bindings.
>> .Move all DT connections specification to use the generic
>> graph bindings.
>> .The removal of the replicator driver since it doesn't show
>> on the AMBA bus. Drivers for enhanced replicators that have
>> a configuration space can be added when the need arises.
> So now any source or link can have multiple output ports. But you
> still have a device type CORESIGHT_DEV_SUBTYPE_LINK_SPLIT, which is
> now unused. Is CORESIGHT_DEV_SUBTYPE_LINK_SPLIT there just for
> future programmable replicators?
I kept it to guide the way to future implementation. I currently have
a target with a programmable replicator on it but simply haven't had
the time to provide the necessary support.
> It would be simpler if you kept the separate replicator component,
> even for non-programmable replicators.
I agree with your position - doing so would certainly highlight that a
replicator is present and would shed light on why components with a
single output suddenly appear to have multiples. I removed
non-programmable replicators because they don't show on the AMBA bus.
Russell, given that all other coresight drivers go through AMBA for
their registration, would you agree to have non-programmable
replicators show up in DT specifications even if they don't get
registered via the AMBA interface? From a computational point of view
the end result is the same - is it strictly on the basis of
>Then a node can be a merge
> node (multiple inputs) or split node (multiple outputs) but not both.
> Also, the global curr_sink limits you to one trace sink device.
> It will need changing for systems with multiple ETBs, or where
> people want to route one trace source to an ETB and another to a TPIU.
Very good point - I did not think about that.
> One way to support this (without exposing the full topology to the
> user) would be to have a trace sink per trace source. So instead of
> switching the sink system-wide, the user would switch the sink for
> each source. You would then run into the problem that some valid
> end states cannot be reached by individually changing the sink of
> each source, but the sources would have to be changed as a group.
> For example:
> cpu #0 --funnel--replicator--tpiu
> cpu #1 -/ \-etb
> stm ---------etf-------------etr
> CPU #0 and CPU #1 have to go to the same place (unless you have a
> programmable filtering replicator) but STM goes to a different place.
> You need an interface that lets you set the destination for multiple
> devices, either to a specific trace sink, or expressed in terms of
> intent (on-chip vs. off-chip) with the ability to read back to find
> out where you'll actually find the trace for any given source.
Ok, let me look into that. I may have to get back to you in order to
iron out some corner cases but as a whole I get the concept.
>> . http://thread.gmane.org/gmane.linux.kernel/1714785
>> Mathieu Poirier (3):
>> coresight: adding support for beagle and beagleXM
>> coresight: adding basic support for Vexpress TC2
>> ARM: removing support for etb/etm in "arch/arm/kernel/"
>> Pratik Patel (6):
>> coresight: add CoreSight core layer framework
>> coresight-tmc: add CoreSight TMC driver
>> coresight-tpiu: add CoreSight TPIU driver
>> coresight-etb: add CoreSight ETB driver
>> coresight-funnel: add CoreSight Funnel driver
>> coresight-etm: add CoreSight ETM/PTM driver
>> .../devicetree/bindings/arm/coresight.txt | 141 ++
>> arch/arm/boot/dts/omap3-beagle-xm.dts | 28 +
>> arch/arm/boot/dts/omap3-beagle.dts | 28 +
>> arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts | 174 +++
>> arch/arm/include/asm/hardware/coresight.h | 157 --
>> arch/arm/include/asm/hardware/cp14.h | 540 +++++++
>> arch/arm/kernel/Makefile | 1 -
>> arch/arm/kernel/etm.c | 654 ---------
>> arch/arm/kernel/hw_breakpoint.c | 4 +-
>> arch/arm/mach-omap2/Kconfig | 8 -
>> arch/arm/mach-omap2/Makefile | 1 -
>> arch/arm/mach-omap2/emu.c | 50 -
>> drivers/Kconfig | 2 +
>> drivers/Makefile | 1 +
>> drivers/amba/bus.c | 2 +-
>> drivers/coresight/Kconfig | 39 +
>> drivers/coresight/Makefile | 8 +
>> drivers/coresight/coresight-etb.c | 557 ++++++++
>> drivers/coresight/coresight-etm-cp14.c | 506 +++++++
>> drivers/coresight/coresight-etm.c | 1507
>> drivers/coresight/coresight-etm.h | 192 +++
>> drivers/coresight/coresight-funnel.c | 252 ++++
>> drivers/coresight/coresight-priv.h | 69 +
>> drivers/coresight/coresight-tmc.c | 791
>> drivers/coresight/coresight-tpiu.c | 223 +++
>> drivers/coresight/coresight.c | 680 +++++++++
>> drivers/coresight/of_coresight.c | 207 +++
>> include/linux/amba/bus.h | 1 +
>> include/linux/coresight.h | 190 +++
>> include/linux/of_coresight.h | 27 +
>> 30 files changed, 6166 insertions(+), 874 deletions(-)
>> create mode 100644
>> delete mode 100644 arch/arm/include/asm/hardware/coresight.h
>> create mode 100644 arch/arm/include/asm/hardware/cp14.h
>> delete mode 100644 arch/arm/kernel/etm.c
>> delete mode 100644 arch/arm/mach-omap2/emu.c
>> create mode 100644 drivers/coresight/Kconfig
>> create mode 100644 drivers/coresight/Makefile
>> create mode 100644 drivers/coresight/coresight-etb.c
>> create mode 100644 drivers/coresight/coresight-etm-cp14.c
>> create mode 100644 drivers/coresight/coresight-etm.c
>> create mode 100644 drivers/coresight/coresight-etm.h
>> create mode 100644 drivers/coresight/coresight-funnel.c
>> create mode 100644 drivers/coresight/coresight-priv.h
>> create mode 100644 drivers/coresight/coresight-tmc.c
>> create mode 100644 drivers/coresight/coresight-tpiu.c
>> create mode 100644 drivers/coresight/coresight.c
>> create mode 100644 drivers/coresight/of_coresight.c
>> create mode 100644 include/linux/coresight.h
>> create mode 100644 include/linux/of_coresight.h
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