Sadly we can not read any registers via command stream so we need
to extend the drm_etnaviv_gem_submit struct with performance monitor
requests. Those requests gets process before and/or after the actual
submitted command stream.
The Vivante kernel driver has a special ioctl to read all perfmon
registers at once and return it. There is no connection between
a specifc command stream and the read perf values.
Signed-off-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
---
include/uapi/drm/etnaviv_drm.h | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/include/uapi/drm/etnaviv_drm.h b/include/uapi/drm/etnaviv_drm.h
index 9e488a0..b67a7dd 100644
--- a/include/uapi/drm/etnaviv_drm.h
+++ b/include/uapi/drm/etnaviv_drm.h
@@ -150,6 +150,19 @@ struct drm_etnaviv_gem_submit_bo {
__u64 presumed; /* in/out, presumed buffer address */
};
+/* performance monitor request (pmr) */
+#define ETNA_PM_PROCESS_PRE 0x0001
+#define ETNA_PM_PROCESS_POST 0x0002
+struct drm_etnaviv_gem_submit_pmr {
+ __u32 flags; /* in, when to process request (ETNA_PM_PROCESS_x) */
+ __u8 domain; /* in, pm domain */
+ __u8 signal; /* in, pm signal */
+ __u16 pad[3];
+ __u32 sequence; /* in, sequence number */
+ __u32 read_offset; /* in, offset from read_bo */
+ __u32 read_idx; /* in, index of read_bo buffer */
+};
+
/* Each cmdstream submit consists of a table of buffers involved, and
* one or more cmdstream buffers. This allows for conditional execution
* (context-restore), and IB buffers needed for per tile/bin draw cmds.
@@ -175,6 +188,9 @@ struct drm_etnaviv_gem_submit {
__u64 stream; /* in, ptr to cmdstream */
__u32 flags; /* in, mask of ETNA_SUBMIT_x */
__s32 fence_fd; /* in/out, fence fd (see ETNA_SUBMIT_FENCE_FD_x) */
+ __u64 pmrs; /* in, ptr to array of submit_pmr's */
+ __u32 nr_pmrs; /* in, number of submit_pmr's */
+ __u32 pad;
};
/* The normal way to synchronize with the GPU is just to CPU_PREP on
--
2.9.4
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