[PATCH 00/11 v6] Coresight framework and drivers

mathieu.poirier
2014-09-11T15:49:40Z

From: Mathieu Poirier <mathieu.poirier@linaro.org>

Coresight is an umbrella of technologies allowing for the debugging of ARM
based SoCs. It includes solutions for JTAG and HW assisted tracing. This
patchset is concerned with the latter.

Coresight components are cathegorised as source, link and sinks and are
(usually) discovered using the AMBA bus.

"Sources" generate a compressed stream representing the processor instruction
path based on tracing scenarios as configured by users. From there the stream
flows through the coresight system (via ATB bus) using links that are connecting
the emanating source to a sink(s). Sinks serve as endpoints to the coresight
implementation, either storing the compressed stream in a memory buffer or
creating an interface to the outside world where data can be transfered to a
host without fear of filling up the onboard coresight memory buffer.

At typical coresight system would look like this:

*****************************************************************
**************************** AMBA AXI ****************************===||
***************************************************************** ||
^ ^ | ||
| | * **
0000000 ::::: 0000000 ::::: ::::: @@@@@@@ ||||||||||||
0 CPU 0<-->: C : 0 CPU 0<-->: C : : C : @ STM @ || System ||
|->0000000 : T : |->0000000 : T : : T :<--->@@@@@ || Memory ||
| #######<-->: I : | #######<-->: I : : I : @@@<-| ||||||||||||
| # ETM # ::::: | # PTM # ::::: ::::: @ |
| ##### ^ ^ | ##### ^ ! ^ ! . | |||||||||
| |->### | ! | |->### | ! | ! . | || DAP ||
| | # | ! | | # | ! | ! . | |||||||||
| | . | ! | | . | ! | ! . | | |
| | . | ! | | . | ! | ! . | | *
| | . | ! | | . | ! | ! . | | SWD/
| | . | ! | | . | ! | ! . | | JTAG
*****************************************************************<-|
*************************** AMBA Debug ABP ************************
*****************************************************************
| . ! . ! ! . |
| . * . * * . |
*****************************************************************
******************** Cross Trigger Matrix (CTM) *******************
*****************************************************************
| . ^ . . |
| * ! * * |
*****************************************************************
****************** AMBA Advanced Trace Bus (ATB) ******************
*****************************************************************
| ! =============== |
| * ===== F =====<---------|
| ::::::::: ==== U ====
|-->:: CTI ::<!! === N ===
| ::::::::: ! == N ==
| ^ * == E ==
| ! &&&&&&&&& IIIIIII == L ==
|------>&& ETB &&<......II I =======
| ! &&&&&&&&& II I .
| ! I I .
| ! I REP I<..........
| ! I I
| !!>&&&&&&&&& II I *Source: ARM ltd.
|------>& TPIU &<......II I DAP = Debug Access Port
&&&&&&&&& IIIIIII ETM = Embedded Trace Macrocell
; PTM = Program Trace Macrocell
; CTI = Cross Trigger Interface
* ETB = Embedded Trace Buffer
To trace port TPIU= Trace Port Interface Unit
SWD = Serial Wire Debug

While on target configuration of the components is done via the ABP bus,
all trace data are carried out-of-band on the ATB bus. The CTM provides
a way to aggregate and distribute signals between CoreSight components.

The coresight framework provides a central point to represent, configure and
manage coresight devices on a platform. This first wave centers on the basic
tracing functionnality, enabling components such ETM/PTM, funnel, replicator, TMC,
TPIU and ETB. Subsequent submissions will enable more intricate IP blocks such
as STM and CTI.

Generated traces are encoded in a PFTv1.1 format and can be interpreted
using the procedure detailed here [1] or ptm2human [2]. STM abides to the
widely available STPv2 standard.

Bindings for the driver have been sent separately to the devicetree list.

[1].https://wiki.linaro.org/WorklingGroups/Kernel/Coresight/traceDecodingWithDS5
[2].https://github.com/hwangcc23/ptm2human

New in this patchset:
. Using krefs for reference accounting
. New kerneldocs for *all* structures
. Removal of @of_coresight_is_input_port
. Removal of @coresight_is_bit_set
. Code cleanup, specifically related to error paths
. Simplification of CP14 access methods
. Standardisation of error messages with @pr_fmt
. Improved Documentation/tracing/coresight.txt

Mathieu Poirier (4):
coresight: adding documentation for coresight
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 (7):
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-replicator: add CoreSight Replicator driver
coresight-etm: add CoreSight ETM/PTM driver

Documentation/trace/coresight.txt | 300 +++++
arch/arm/Kconfig.debug | 35 +-
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 | 199 ++++
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/Makefile | 1 +
drivers/amba/bus.c | 2 +-
drivers/coresight/Makefile | 9 +
drivers/coresight/coresight-etb10.c | 536 +++++++++
drivers/coresight/coresight-etm-cp14.c | 496 ++++++++
drivers/coresight/coresight-etm.h | 250 ++++
drivers/coresight/coresight-etm3x.c | 1722 ++++++++++++++++++++++++++++
drivers/coresight/coresight-funnel.c | 258 +++++
drivers/coresight/coresight-priv.h | 63 +
drivers/coresight/coresight-replicator.c | 153 +++
drivers/coresight/coresight-tmc.c | 756 ++++++++++++
drivers/coresight/coresight-tpiu.c | 218 ++++
drivers/coresight/coresight.c | 663 +++++++++++
drivers/coresight/of_coresight.c | 201 ++++
include/linux/amba/bus.h | 1 +
include/linux/coresight.h | 275 +++++
29 files changed, 6727 insertions(+), 882 deletions(-)
create mode 100644 Documentation/trace/coresight.txt
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/Makefile
create mode 100644 drivers/coresight/coresight-etb10.c
create mode 100644 drivers/coresight/coresight-etm-cp14.c
create mode 100644 drivers/coresight/coresight-etm.h
create mode 100644 drivers/coresight/coresight-etm3x.c
create mode 100644 drivers/coresight/coresight-funnel.c
create mode 100644 drivers/coresight/coresight-priv.h
create mode 100644 drivers/coresight/coresight-replicator.c
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

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1.9.1