sync: add ioctl to get fence data
Change-Id: I71410aef7e03a52562f7cb15b993ac8441b1fa12
Signed-off-by: Erik Gilling <konkers@android.com>
diff --git a/include/linux/sync.h b/include/linux/sync.h
index d64271b..4f19938 100644
--- a/include/linux/sync.h
+++ b/include/linux/sync.h
@@ -43,6 +43,10 @@
* should not print a newline
* @print_pt: print aditional debug information about sync_pt.
* should not print a newline
+ * @fill_driver_data: write implmentation specific driver data to data.
+ * should return an error if there is not enough room
+ * as specified by size. This information is returned
+ * to userspace by SYNC_IOC_FENCE_INFO.
*/
struct sync_timeline_ops {
const char *driver_name;
@@ -68,6 +72,9 @@
/* optional */
void (*print_pt)(struct seq_file *s, struct sync_pt *sync_pt);
+
+ /* optional */
+ int (*fill_driver_data)(struct sync_pt *syncpt, void *data, int size);
};
/**
@@ -312,6 +319,42 @@
__s32 fence; /* fd on newly created fence */
};
+/**
+ * struct sync_pt_info - detailed sync_pt information
+ * @len: length of sync_pt_info including any driver_data
+ * @obj_name: name of parent sync_timeline
+ * @driver_name: name of driver implmenting the parent
+ * @status: status of the sync_pt 0:active 1:signaled <0:error
+ * @timestamp_ns: timestamp of status change in nanoseconds
+ * @driver_data: any driver dependant data
+ */
+struct sync_pt_info {
+ __u32 len;
+ char obj_name[32];
+ char driver_name[32];
+ __s32 status;
+ __u64 timestamp_ns;
+
+ __u8 driver_data[0];
+};
+
+/**
+ * struct sync_fence_info_data - data returned from fence info ioctl
+ * @len: ioctl caller writes the size of the buffer its passing in.
+ * ioctl returns length of sync_fence_data reutnred to userspace
+ * including pt_info.
+ * @name: name of fence
+ * @status: status of fence. 1: signaled 0:active <0:error
+ * @pt_info: a sync_pt_info struct for every sync_pt in the fence
+ */
+struct sync_fence_info_data {
+ __u32 len;
+ char name[32];
+ __s32 status;
+
+ __u8 pt_info[0];
+};
+
#define SYNC_IOC_MAGIC '>'
/**
@@ -330,4 +373,18 @@
*/
#define SYNC_IOC_MERGE _IOWR(SYNC_IOC_MAGIC, 1, struct sync_merge_data)
+/**
+ * DOC: SYNC_IOC_FENCE_INFO - get detailed information on a fence
+ *
+ * Takes a struct sync_fence_info_data with extra space allocated for pt_info.
+ * Caller should write the size of the buffer into len. On return, len is
+ * updated to reflect the total size of the sync_fence_info_data including
+ * pt_info.
+ *
+ * pt_info is a buffer containing sync_pt_infos for every sync_pt in the fence.
+ * To itterate over the sync_pt_infos, use the sync_pt_info.len field.
+ */
+#define SYNC_IOC_FENCE_INFO _IOWR(SYNC_IOC_MAGIC, 2,\
+ struct sync_fence_info_data)
+
#endif /* _LINUX_SYNC_H */