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Subject[PATCH 25/32] coresight: tmc-etr: Create per-thread buffer allocation function
Date
Buffer allocation is different when dealing with per-thread and
CPU-wide sessions. In preparation to support CPU-wide trace scenarios
simplify things by keeping allocation functions for both type separate.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
---
.../hwtracing/coresight/coresight-tmc-etr.c | 29 ++++++++++++++++++-
1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index e1d2128ee757..bca1b2d9ef2e 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1207,6 +1207,33 @@ alloc_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
return etr_buf;
}

+static struct etr_buf *
+get_perf_etr_buf_per_thread(struct tmc_drvdata *drvdata,
+ struct perf_event *event, int nr_pages,
+ void **pages, bool snapshot)
+{
+ struct etr_buf *etr_buf;
+
+ /*
+ * In per-thread mode the etr_buf isn't shared, so just go ahead
+ * with memory allocation.
+ */
+ etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot);
+
+ return etr_buf;
+}
+
+static struct etr_buf *
+get_perf_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
+ int nr_pages, void **pages, bool snapshot)
+{
+ if (event->cpu == -1)
+ return get_perf_etr_buf_per_thread(drvdata, event, nr_pages,
+ pages, snapshot);
+
+ return ERR_PTR(-ENOENT);
+}
+
static struct etr_perf_buffer *
tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
int nr_pages, void **pages, bool snapshot)
@@ -1223,7 +1250,7 @@ tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
if (!etr_perf)
return ERR_PTR(-ENOMEM);

- etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot);
+ etr_buf = get_perf_etr_buf(drvdata, event, nr_pages, pages, snapshot);
if (!IS_ERR(etr_buf))
goto done;

--
2.17.1
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