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authorMathieu Poirier <mathieu.poirier@linaro.org>2019-04-25 13:53:02 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-25 22:00:17 +0200
commit855ab61c16bf70b646fa9c84e7b07d14a003cd42 (patch)
treee832b6b5428c9aea6a225e47d257f93594f5c45b /drivers/hwtracing
parenta0f08a6a9fee0ce3f2d36e3e30799e4c1ec171f4 (diff)
downloadlinux-855ab61c16bf70b646fa9c84e7b07d14a003cd42.tar.bz2
coresight: tmc-etr: Refactor function tmc_etr_setup_perf_buf()
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.poirier@linaro.org> Tested-by: Leo Yan <leo.yan@linaro.org> Tested-by: Robert Walker <robert.walker@arm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c39
1 files changed, 30 insertions, 9 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 55ee0aca321c..e1d2128ee757 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1160,29 +1160,24 @@ out:
}
/*
- * 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.
@@ -1206,6 +1201,32 @@ 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);