[0/9] coresight: change some driver' spinlock type to raw_spinlock_t

Message

Yeoreum Yun Nov. 25, 2024, 9:48 a.m. UTC

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.

Levi 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 cti_drvdata spinlock's type to
    raw_spinlock_t

 .../hwtracing/coresight/coresight-config.c    |  21 +-
 .../hwtracing/coresight/coresight-config.h    |   2 +-
 drivers/hwtracing/coresight/coresight-core.c  |   2 +-
 .../hwtracing/coresight/coresight-cti-core.c  |  65 +-
 .../hwtracing/coresight/coresight-cti-sysfs.c | 135 +++--
 drivers/hwtracing/coresight/coresight-cti.h   |   2 +-
 drivers/hwtracing/coresight/coresight-etb10.c |  62 +-
 .../coresight/coresight-etm4x-core.c          |  71 ++-
 .../coresight/coresight-etm4x-sysfs.c         | 566 +++++++++---------
 drivers/hwtracing/coresight/coresight-etm4x.h |   2 +-
 .../hwtracing/coresight/coresight-funnel.c    |  34 +-
 .../coresight/coresight-replicator.c          |  36 +-
 .../hwtracing/coresight/coresight-syscfg.c    |  75 ++-
 .../hwtracing/coresight/coresight-tmc-core.c  |   9 +-
 .../hwtracing/coresight/coresight-tmc-etf.c   | 195 +++---
 .../hwtracing/coresight/coresight-tmc-etr.c   | 199 +++---
 drivers/hwtracing/coresight/coresight-tmc.h   |   2 +-
 .../hwtracing/coresight/coresight-trace-id.c  |  93 ++-
 drivers/hwtracing/coresight/ultrasoc-smb.c    |  12 +-
 drivers/hwtracing/coresight/ultrasoc-smb.h    |   2 +-
 include/linux/coresight.h                     |   4 +-
 21 files changed, 751 insertions(+), 838 deletions(-)

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