[PATCH v3 12/20] coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf()

[Mathieu Poirier]

Refactoring function tmc_etr_setup_perf_buf() so that it only deals
with the high level etr_perf_buffer, leaving the allocation of the
backend buffer (i.e etr_buf) to another function.

That way the backend buffer allocation function can decide if it wants
to reuse an existing buffer (CPU-wide trace scenarios) or simply create
a new one.

Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
 .../hwtracing/coresight/coresight-tmc-etr.c   | 39 ++++++++++++++-----
 1 file changed, 30 insertions(+), 9 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c 
b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 00db6a6ce23f..e9c77009188a 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1159,29 +1159,24 @@ static int tmc_enable_etr_sink_sysfs(struct 
coresight_device *csdev)
 }
 
 /*
- * tmc_etr_setup_perf_buf: Allocate ETR buffer for use by perf.
+ * alloc_etr_buf: Allocate ETR buffer for use by perf.
  * The size of the hardware buffer is dependent on the size configured
  * via sysfs and the perf ring buffer size. We prefer to allocate the
  * largest possible size, scaling down the size by half until it
  * reaches a minimum limit (1M), beyond which we give up.
  */
-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)
+static struct etr_buf *
+alloc_etr_buf(struct tmc_drvdata *drvdata, struct perf_event *event,
+             int nr_pages, void **pages, bool snapshot)
 {
        int node, cpu = event->cpu;
        struct etr_buf *etr_buf;
-       struct etr_perf_buffer *etr_perf;
        unsigned long size;
 
        if (cpu == -1)
                cpu = smp_processor_id();
        node = cpu_to_node(cpu);
 
-       etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node);
-       if (!etr_perf)
-               return ERR_PTR(-ENOMEM);
-
        /*
         * Try to match the perf ring buffer size if it is larger
         * than the size requested via sysfs.
@@ -1205,6 +1200,32 @@ tmc_etr_setup_perf_buf(struct tmc_drvdata *drvdata, 
struct perf_event *event,
                size /= 2;
        } while (size >= TMC_ETR_PERF_MIN_BUF_SIZE);
 
+       return ERR_PTR(-ENOMEM);
+
+done:
+       return etr_buf;
+}
+
+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)
+{
+       int node, cpu = event->cpu;
+       struct etr_buf *etr_buf;
+       struct etr_perf_buffer *etr_perf;
+
+       if (cpu == -1)
+               cpu = smp_processor_id();
+       node = cpu_to_node(cpu);
+
+       etr_perf = kzalloc_node(sizeof(*etr_perf), GFP_KERNEL, node);
+       if (!etr_perf)
+               return ERR_PTR(-ENOMEM);
+
+       etr_buf = alloc_etr_buf(drvdata, event, nr_pages, pages, snapshot);
+       if (!IS_ERR(etr_buf))
+               goto done;
+
        kfree(etr_perf);
        return ERR_PTR(-ENOMEM);
 
-- 
2.17.1