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When operating in CPU-wide mode with an N:1 source/sink HW topology, multiple CPUs can access a sink concurrently. As such reference counting needs to happen when the device's spinlock is held to avoid racing with other operations (start(), update(), stop()), such as: session A Session B ----- ------- enable_sink atomic_inc(refcount) = 1 ... atomic_dec(refcount) = 0 enable_sink if (refcount == 0) disable_sink atomic_inc() Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Tested-by: Leo Yan <leo.yan@linaro.org> Tested-by: Robert Walker <robert.walker@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| .. | ||
| coresight-catu.c | ||
| coresight-catu.h | ||
| coresight-cpu-debug.c | ||
| coresight-etb10.c | ||
| coresight-etm3x-sysfs.c | ||
| coresight-etm3x.c | ||
| coresight-etm4x-sysfs.c | ||
| coresight-etm4x.c | ||
| coresight-etm4x.h | ||
| coresight-etm-cp14.c | ||
| coresight-etm-perf.c | ||
| coresight-etm-perf.h | ||
| coresight-etm.h | ||
| coresight-funnel.c | ||
| coresight-priv.h | ||
| coresight-replicator.c | ||
| coresight-stm.c | ||
| coresight-tmc-etf.c | ||
| coresight-tmc-etr.c | ||
| coresight-tmc.c | ||
| coresight-tmc.h | ||
| coresight-tpiu.c | ||
| coresight.c | ||
| Kconfig | ||
| Makefile | ||
| of_coresight.c | ||