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 sysfs-mode. 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 coreisght-next tree from Mathieu Changes since previous version [1]: - Rebased to Mathieu's coresight-next tree to resolve a conflict. - Added tags for DT changes from Rob and Mathieu - Split the SG mode backend support patch from the ETR-BUF patch. - Address other comments from Mathieu Changes since splitted series [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] - http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/574875.html [1] - http://lists.infradead.org/pipermail/linux-arm-kernel/2018-May/579135.html Suzuki K Poulose (12): 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-etr buf: Add TMC scatter gather mode backend 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 | 31 +- drivers/hwtracing/coresight/coresight-priv.h | 10 +- drivers/hwtracing/coresight/coresight-tmc-etf.c | 45 +- drivers/hwtracing/coresight/coresight-tmc-etr.c | 1010 ++++++++++++++++++-- drivers/hwtracing/coresight/coresight-tmc.c | 83 +- drivers/hwtracing/coresight/coresight-tmc.h | 110 ++- drivers/hwtracing/coresight/coresight.c | 3 +- 11 files changed, 1144 insertions(+), 174 deletions(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
