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From: Suzuki K Poulose <suzuki.poulose@arm.com>
To: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org, mathieu.poirier@linaro.org,
	mike.leach@linaro.org, robert.walker@arm.com,
	coresight@lists.linaro.org, devicetree@vger.kernel.org,
	robh@kernel.org, frowand.list@gmail.com,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH v2 00/12] coresight: tmc-etr Transparent buffer management
Date: Tue, 29 May 2018 14:15:25 +0100	[thread overview]
Message-ID: <1527599737-28408-1-git-send-email-suzuki.poulose@arm.com> (raw)

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

             reply	other threads:[~2018-05-29 13:20 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-29 13:15 Suzuki K Poulose [this message]
2018-05-29 13:15 ` [PATCH v2 01/12] coresight: ETM: Add support for Arm Cortex-A73 and Cortex-A35 Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 02/12] coresight: tmc: Hide trace buffer handling for file read Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 03/12] coresight: tmc-etr: Do not clean trace buffer Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 04/12] coresight: tmc-etr: Disallow perf mode Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 05/12] coresight: Add helper for inserting synchronization packets Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 06/12] dts: bindings: Restrict coresight tmc-etr scatter-gather mode Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 07/12] dts: juno: Add scatter-gather support for all revisions Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 08/12] coresight: Add generic TMC sg table framework Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 09/12] coresight: Add support for TMC ETR SG unit Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 10/12] coresight: tmc-etr: Add transparent buffer management Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 11/12] coresight: tmc-etr buf: Add TMC scatter gather mode backend Suzuki K Poulose
2018-05-29 13:15 ` [PATCH v2 12/12] coresight: tmc: Add configuration support for trace buffer size Suzuki K Poulose
2018-05-31  3:55   ` Rob Herring
2018-05-31 15:36 ` [PATCH v2 00/12] coresight: tmc-etr Transparent buffer management Mathieu Poirier
2018-05-31 16:17   ` Suzuki K Poulose

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