[PATCH v3 13/20] coresight: tmc-etr: Create per-thread buffer allocation function

[Mathieu Poirier]

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.poir...@linaro.org>
---
 .../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 e9c77009188a..ac1efdfc0d07 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1206,6 +1206,33 @@ 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)
@@ -1222,7 +1249,7 @@ 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