[PATCH v2 10/23] coresight: trbe: Drop redundant disables

[Leo Yan <leo.yan@arm.com>]

The IRQ handler has a common point that disables TRBE before dispatching
the fault action. Once execution reaches the overflow handling or
truncate path, the trace buffer has already been stopped.

The __arm_trbe_enable() error path does not need a disable there either,
as TRBE is already in disabled state.

Remove TRBE disable from the truncate helper and from the overflow
failure path. The truncate helper only needs to mark and end the AUX
output, so rename it to trbe_truncate_event() to reflect its remaining
purpose.

Signed-off-by: Leo Yan <leo.yan@arm.com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index dd9c9330bb0c739795f300dafc6ce34e72fbf280..4a041bbc6e970d72a7d735e15f7221037cb091d6 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -301,18 +301,10 @@ static void trbe_report_wrap_event(struct perf_output_handle *handle)
 	perf_aux_output_flag(handle, PERF_AUX_FLAG_COLLISION);
 }
 
-static void trbe_stop_and_truncate_event(struct perf_output_handle *handle)
+static void trbe_truncate_event(struct perf_output_handle *handle)
 {
 	struct trbe_buf *buf = etm_perf_sink_config(handle);
 
-	/*
-	 * We cannot proceed with the buffer collection and we
-	 * do not have any data for the current session. The
-	 * etm_perf driver expects to close out the aux_buffer
-	 * at event_stop(). So disable the TRBE here and leave
-	 * the update_buffer() to return a 0 size.
-	 */
-	trbe_drain_and_disable_local(buf->cpudata);
 	perf_aux_output_flag(handle, PERF_AUX_FLAG_TRUNCATED);
 	perf_aux_output_end(handle, 0);
 	*this_cpu_ptr(buf->cpudata->drvdata->handle) = NULL;
@@ -1024,7 +1016,7 @@ static int __arm_trbe_enable(struct trbe_buf *buf,
 	trbe_enable_hw(buf);
 	return 0;
 err:
-	trbe_stop_and_truncate_event(handle);
+	trbe_truncate_event(handle);
 	return ret;
 }
 
@@ -1117,7 +1109,6 @@ static int trbe_handle_overflow(struct perf_output_handle *handle)
 		 * is able to detect this with a disconnected handle
 		 * (handle->event = NULL).
 		 */
-		trbe_drain_and_disable_local(buf->cpudata);
 		*this_cpu_ptr(buf->cpudata->drvdata->handle) = NULL;
 		return -EINVAL;
 	}
@@ -1208,7 +1199,7 @@ static irqreturn_t arm_trbe_irq_handler(int irq, void *dev)
 		trbe_handle_spurious(handle);
 		break;
 	case TRBE_FAULT_ACT_FATAL:
-		trbe_stop_and_truncate_event(handle);
+		trbe_truncate_event(handle);
 		truncated = true;
 		break;
 	}

-- 
2.34.1