On 29 May 2018 at 07:15, Suzuki K Poulose <suzuki.poulose@xxxxxxx> wrote: > 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(-) Applied after correcting indentation problems and rectifying the kernel version and date in "sysfs-bus-coresight-devices-tmc". Mathieu > > -- > 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
