2 files changed, 33 insertions, 0 deletions

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 401554074de9..5a94f6d6fa91 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -284,6 +284,18 @@ struct pmu {
          * Return the count value for a counter.
          */
         u64 (*count)                    (struct perf_event *event); /*optional*/
+
+        /*
+         * Set up pmu-private data structures for an AUX area
+         */
+        void *(*setup_aux)              (int cpu, void **pages,
+                                         int nr_pages, bool overwrite);
+                                        /* optional */
+
+        /*
+         * Free pmu-private AUX data structures
+         */
+        void (*free_aux)                (void *aux); /* optional */
 };
 
 /**
@@ -862,6 +874,11 @@ static inline bool needs_branch_stack(struct perf_event *event)
         return event->attr.branch_sample_type != 0;
 }
 
+static inline bool has_aux(struct perf_event *event)
+{
+        return event->pmu->setup_aux;
+}
+
 extern int perf_output_begin(struct perf_output_handle *handle,
                              struct perf_event *event, unsigned int size);
 extern void perf_output_end(struct perf_output_handle *handle);
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 86c44ae66d43..6c5013a71714 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -530,6 +530,22 @@ struct perf_event_mmap_page {
         __u64   data_tail;              /* user-space written tail */
         __u64   data_offset;            /* where the buffer starts */
         __u64   data_size;              /* data buffer size */
+
+        /*
+         * AUX area is defined by aux_{offset,size} fields that should be set
+         * by the userspace, so that
+         *
+         *   aux_offset >= data_offset + data_size
+         *
+         * prior to mmap()ing it. Size of the mmap()ed area should be aux_size.
+         *
+         * Ring buffer pointers aux_{head,tail} have the same semantics as
+         * data_{head,tail} and same ordering rules apply.
+         */
+        __u64   aux_head;
+        __u64   aux_tail;
+        __u64   aux_offset;
+        __u64   aux_size;
 };
 
 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)