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Subject[PATCH 00/11] coresight: tmc-etr Transparent buffer management
This series is split of the Coresight ETR perf support patches posted
here [0]. The CATU support and perf backend support will be posted as
separate series for better management and review of the patches.

This series adds the support for TMC ETR Scatter-Gather mode to allow
using physical non-contiguous buffer for holding the trace data. It
also adds a layer to handle the buffer management in a transparent
manner, independent of the underlying mode used by the TMC ETR.
The layer chooses the ETR mode based on different parameters (size,
re-using a set of pages, presence of an SMMU etc.).

Finally we add a sysfs parameter to tune the buffer size for ETR in

During the testing, we found out that if the TMC ETR is not properly
connected to the memory subsystem, the ETR could lock-up the system
while waiting for the "read" transactions to complete in scatter-gather
mode. So, we do not use the mode on a system unless it is safe to do
so. This is specified by a DT property "arm,scatter-gather".

Applies on v4.17-rc4

Changes since v2 in [0] :
- Split the series in [0]
- Address comments on v2
- Rename DT property "scatter-gather" to "arm,scatter-gather"
- Add ETM PID for Cortex-A35, use macros to make the listing easier

[0] -

Suzuki K Poulose (11):
coresight: ETM: Add support for Arm Cortex-A73 and Cortex-A35
coresight: tmc: Hide trace buffer handling for file read
coresight: tmc-etr: Do not clean trace buffer
coresight: tmc-etr: Disallow perf mode
coresight: Add helper for inserting synchronization packets
dts: bindings: Restrict coresight tmc-etr scatter-gather mode
dts: juno: Add scatter-gather support for all revisions
coresight: Add generic TMC sg table framework
coresight: Add support for TMC ETR SG unit
coresight: tmc-etr: Add transparent buffer management
coresight: tmc: Add configuration support for trace buffer size

.../ABI/testing/sysfs-bus-coresight-devices-tmc | 8 +
.../devicetree/bindings/arm/coresight.txt | 5 +-
arch/arm64/boot/dts/arm/juno-base.dtsi | 1 +
drivers/hwtracing/coresight/coresight-etb10.c | 12 +-
drivers/hwtracing/coresight/coresight-etm4x.c | 32 +-
drivers/hwtracing/coresight/coresight-priv.h | 10 +-
drivers/hwtracing/coresight/coresight-tmc-etf.c | 45 +-
drivers/hwtracing/coresight/coresight-tmc-etr.c | 1032 ++++++++++++++++++--
drivers/hwtracing/coresight/coresight-tmc.c | 83 +-
drivers/hwtracing/coresight/coresight-tmc.h | 111 ++-
drivers/hwtracing/coresight/coresight.c | 3 +-
11 files changed, 1169 insertions(+), 173 deletions(-)


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