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coresight: Add helper for atomically taking the device
Now that mode is in struct coresight_device, this pattern can be wrapped in a helper. Signed-off-by: James Clark <james.clark@arm.com> Link: https://lore.kernel.org/r/20240129154050.569566-11-james.clark@arm.com Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
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@ -556,14 +556,12 @@ static int etm_enable(struct coresight_device *csdev, struct perf_event *event,
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enum cs_mode mode)
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{
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int ret;
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u32 val;
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struct etm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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val = local_cmpxchg(&drvdata->csdev->mode, CS_MODE_DISABLED, mode);
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/* Someone is already using the tracer */
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if (val)
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if (!coresight_take_mode(csdev, mode)) {
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/* Someone is already using the tracer */
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return -EBUSY;
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}
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switch (mode) {
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case CS_MODE_SYSFS:
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@ -840,13 +840,11 @@ static int etm4_enable(struct coresight_device *csdev, struct perf_event *event,
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enum cs_mode mode)
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{
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int ret;
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u32 val;
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val = local_cmpxchg(&csdev->mode, CS_MODE_DISABLED, mode);
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/* Someone is already using the tracer */
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if (val)
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if (!coresight_take_mode(csdev, mode)) {
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/* Someone is already using the tracer */
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return -EBUSY;
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}
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switch (mode) {
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case CS_MODE_SYSFS:
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@ -193,17 +193,15 @@ static void stm_enable_hw(struct stm_drvdata *drvdata)
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static int stm_enable(struct coresight_device *csdev, struct perf_event *event,
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enum cs_mode mode)
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{
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u32 val;
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struct stm_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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if (mode != CS_MODE_SYSFS)
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return -EINVAL;
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val = local_cmpxchg(&csdev->mode, CS_MODE_DISABLED, mode);
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/* Someone is already using the tracer */
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if (val)
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if (!coresight_take_mode(csdev, mode)) {
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/* Someone is already using the tracer */
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return -EBUSY;
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}
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pm_runtime_get_sync(csdev->dev.parent);
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@ -580,6 +580,17 @@ static inline bool coresight_is_percpu_sink(struct coresight_device *csdev)
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(csdev->subtype.sink_subtype == CORESIGHT_DEV_SUBTYPE_SINK_PERCPU_SYSMEM);
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}
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/*
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* Atomically try to take the device and set a new mode. Returns true on
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* success, false if the device is already taken by someone else.
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*/
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static inline bool coresight_take_mode(struct coresight_device *csdev,
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enum cs_mode new_mode)
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{
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return local_cmpxchg(&csdev->mode, CS_MODE_DISABLED, new_mode) ==
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CS_MODE_DISABLED;
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}
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extern struct coresight_device *
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coresight_register(struct coresight_desc *desc);
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extern void coresight_unregister(struct coresight_device *csdev);
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