linux-kernel - [PATCH v4 0/9] coresight: change some driver' spinlock type to raw_spinlock

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Message-Id: <20241220104521.809071-1-yeoreum.yun@arm.com>
Date: Fri, 20 Dec 2024 10:45:11 +0000
From: Yeoreum Yun <yeoreum.yun@....com>
To: suzuki.poulose@....com,
	james.clark@...aro.org,
	alexander.shishkin@...ux.intel.com,
	bigeasy@...utronix.de,
	clrkwllms@...nel.org,
	rostedt@...dmis.org,
	mike.leach@...aro.org
Cc: coresight@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-rt-devel@...ts.linux.dev,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v4 0/9] coresight: change some driver' spinlock type to raw_spinlock_t

In some coresight drivers, drvdata->spinlock can be held during __schedule()
by perf_event_task_sched_out()/in().

Since drvdata->spinlock type is spinlock_t and
perf_event_task_sched_out()/in() is called after acquiring rq_lock,
which is raw_spinlock_t (an unsleepable lock),
this poses an issue in PREEMPT_RT kernel where spinlock_t is sleepable.

To address this,change type drvdata->spinlock in some coresight drivers,
which can be called by perf_event_task_sched_out()/in(),
from spinlock_t to raw_spinlock_t.

Reviewed-by: James Clark <james.clark@...aro.org>

Yeoreum Yun (9):
  coresight: change coresight_device lock type to  raw_spinlock_t
  coresight-etm4x: change etmv4_drvdata spinlock type to  raw_spinlock_t
  coresight: change coresight_trace_id_map's lock type to
    raw_spinlock_t
  coresight-cti: change cti_drvdata spinlock's type to raw_spinlock_t
  coresight-etb10: change etb_drvdata spinlock's type to raw_spinlock_t
  coresight-funnel: change funnel_drvdata spinlock's type to
    raw_spinlock_t
  coresight-replicator: change replicator_drvdata spinlock's type to
    raw_spinlock_t
  coresight-tmc: change tmc_drvdata spinlock's type to raw_spinlock_t
  coresight/ultrasoc: change smb_drv_data spinlock's type to
    raw_spinlock_t

 .../hwtracing/coresight/coresight-config.c    |   8 +-
 .../hwtracing/coresight/coresight-config.h    |   2 +-
 drivers/hwtracing/coresight/coresight-core.c  |   2 +-
 .../hwtracing/coresight/coresight-cti-core.c  |  44 +--
 .../hwtracing/coresight/coresight-cti-sysfs.c |  76 +++---
 drivers/hwtracing/coresight/coresight-cti.h   |   2 +-
 drivers/hwtracing/coresight/coresight-etb10.c |  26 +-
 .../coresight/coresight-etm4x-core.c          |  18 +-
 .../coresight/coresight-etm4x-sysfs.c         | 250 +++++++++---------
 drivers/hwtracing/coresight/coresight-etm4x.h |   2 +-
 .../hwtracing/coresight/coresight-funnel.c    |  12 +-
 .../coresight/coresight-replicator.c          |  12 +-
 .../hwtracing/coresight/coresight-syscfg.c    |  26 +-
 .../hwtracing/coresight/coresight-tmc-core.c  |   6 +-
 .../hwtracing/coresight/coresight-tmc-etf.c   |  48 ++--
 .../hwtracing/coresight/coresight-tmc-etr.c   |  40 +--
 drivers/hwtracing/coresight/coresight-tmc.h   |   2 +-
 .../hwtracing/coresight/coresight-trace-id.c  |  22 +-
 drivers/hwtracing/coresight/ultrasoc-smb.c    |  12 +-
 drivers/hwtracing/coresight/ultrasoc-smb.h    |   2 +-
 include/linux/coresight.h                     |   4 +-
 21 files changed, 308 insertions(+), 308 deletions(-)

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