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coresight: perf: Remove set_buffer call back

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In coresight perf mode, we need to prepare the sink before
starting a session, which is done via set_buffer call back.
We then proceed to enable the tracing. If we fail to start
the session successfully, we leave the sink configuration
unchanged.  In order to make the operation atomic and to
avoid yet another call back to clear the buffer, we get
rid of the "set_buffer" call back and pass the buffer details
via enable() call back to the sink.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:17:56 -06:00 • committed by Greg Kroah-Hartman
parent d25054ee8d
commit 3d6e893575
8 changed files with 59 additions and 38 deletions
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6
include/linux/coresight.h
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@ -185,18 +185,14 @@ struct coresight_device {
* @disable: disables the sink.
* @alloc_buffer: initialises perf's ring buffer for trace collection.
* @free_buffer: release memory allocated in @get_config.
* @set_buffer: initialises buffer mechanic before a trace session.
* @update_buffer: update buffer pointers after a trace session.
*/
struct coresight_ops_sink {
int (*enable)(struct coresight_device *csdev, u32 mode);
int (*enable)(struct coresight_device *csdev, u32 mode, void *data);
void (*disable)(struct coresight_device *csdev);
void *(*alloc_buffer)(struct coresight_device *csdev, int cpu,
void **pages, int nr_pages, bool overwrite);
void (*free_buffer)(void *config);
int (*set_buffer)(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config);
unsigned long (*update_buffer)(struct coresight_device *csdev,
struct perf_output_handle *handle,
void *sink_config);