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From: Andrew Murray <andrew.murray@arm.com>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v1 0/5] coresight: etm4x: save/restore ETMv4 context across CPU low power states
Date: Tue, 18 Jun 2019 13:54:28 +0100	[thread overview]
Message-ID: <20190618125433.9739-1-andrew.murray@arm.com> (raw)

Some hardware will ignore bit TRCPDCR.PU which is used to signal
to hardware that power should not be removed from the trace unit.
Let's mitigate against this by saving and restoring the trace
unit state when the CPU enters low power states.

To provide a benefit to both self-hosted and external debuggers
we save/restore the entire state which includes etmv4_config data
and dynamic data such as inflight counter values, sequencer
states, etc.


Andrew Murray (5):
  coresight: etm4x: remove superfluous setting of os_unlock
  coresight: etm4x: use explicit barriers on enable/disable
  coresight: etm4x: use octal permissions for module_params
  coresight: etm4x: improve clarity of etm4_os_unlock comment
  coresight: etm4x: save/restore state across CPU low power states

 drivers/hwtracing/coresight/coresight-etm4x.c | 260 +++++++++++++++++-
 drivers/hwtracing/coresight/coresight-etm4x.h |  66 ++++-
 drivers/hwtracing/coresight/coresight.c       |   2 +-
 include/linux/coresight.h                     |   7 +
 4 files changed, 327 insertions(+), 8 deletions(-)

-- 
2.21.0


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             reply	other threads:[~2019-06-18 12:54 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-18 12:54 Andrew Murray [this message]
2019-06-18 12:54 ` [PATCH v1 1/5] coresight: etm4x: remove superfluous setting of os_unlock Andrew Murray
2019-06-19 10:42   ` Suzuki K Poulose
2019-06-18 12:54 ` [PATCH v1 2/5] coresight: etm4x: use explicit barriers on enable/disable Andrew Murray
2019-06-18 22:34   ` Mathieu Poirier
2019-06-19  8:32     ` Suzuki K Poulose
2019-06-20 10:25       ` Andrew Murray
2019-06-18 12:54 ` [PATCH v1 3/5] coresight: etm4x: use octal permissions for module_params Andrew Murray
2019-06-19 10:43   ` Suzuki K Poulose
2019-06-18 12:54 ` [PATCH v1 4/5] coresight: etm4x: improve clarity of etm4_os_unlock comment Andrew Murray
2019-06-19 10:46   ` Suzuki K Poulose
2019-06-20 10:29     ` Andrew Murray
2019-06-18 12:54 ` [PATCH v1 5/5] coresight: etm4x: save/restore state across CPU low power states Andrew Murray
2019-06-18 13:21   ` Sudeep Holla
2019-06-19 10:38     ` Suzuki K Poulose
2019-06-19 11:07       ` Sudeep Holla
2019-06-19 16:22         ` Mathieu Poirier
2019-06-20 11:41           ` Andrew Murray
2019-06-20 14:55             ` Mathieu Poirier
2019-06-20 15:41             ` Sudeep Holla
2019-06-20 16:14               ` Mathieu Poirier
2019-06-20 16:34                 ` Sudeep Holla
2019-06-20 16:47                   ` Mathieu Poirier
2019-06-20 16:52                     ` Sudeep Holla
2019-06-20 16:54                     ` Andrew Murray
2019-06-20 17:00                       ` Suzuki K Poulose
2019-06-20 17:10                         ` Mathieu Poirier
2019-06-21  9:29                           ` Andrew Murray
2019-06-21 15:30                             ` Mathieu Poirier
2019-06-20 17:11                         ` Sudeep Holla
2019-06-20 18:00                           ` Mathieu Poirier
2019-06-20 16:48       ` Sudeep Holla
2019-06-18 22:55   ` Mathieu Poirier
2019-06-20 11:07     ` Andrew Murray
2019-06-20 14:49       ` Mathieu Poirier
2019-06-20 15:11         ` Andrew Murray
2019-06-20 15:26           ` Mathieu Poirier
2019-06-25 10:07     ` Suzuki K Poulose
2019-06-25 19:57       ` Mathieu Poirier
2019-06-26 10:21         ` Mike Leach
2019-06-26 16:57           ` Mathieu Poirier
2019-06-27  8:12             ` Andrew Murray
2019-06-27  8:17           ` Andrew Murray
2019-06-20 16:45 ` [PATCH v1 0/5] coresight: etm4x: save/restore ETMv4 context " Suzuki K Poulose
2019-06-20 16:57   ` Andrew Murray

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