We need to readout some registers _after_ the submited command
buffer got executed in order to support perf counters.
There is no way to read register via command stream - even the
Vivante kernel driver does it via a special ioctl.
Signed-off-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
---
include/uapi/drm/etnaviv_drm.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/include/uapi/drm/etnaviv_drm.h b/include/uapi/drm/etnaviv_drm.h
index 2584c1c..0d30604 100644
--- a/include/uapi/drm/etnaviv_drm.h
+++ b/include/uapi/drm/etnaviv_drm.h
@@ -150,6 +150,13 @@ struct drm_etnaviv_gem_submit_bo {
__u64 presumed; /* in/out, presumed buffer address */
};
+struct drm_etnaviv_gem_submit_readback {
+ __u32 readback_offset;/* in, offset from readback_bo */
+ __u32 readback_idx; /* in, index of readback_bo buffer */
+ __u32 reg; /* in, register to read */
+ __u32 flags; /* in, needs to be 0 */
+};
+
/* 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.
@@ -167,6 +174,9 @@ struct drm_etnaviv_gem_submit {
__u64 bos; /* in, ptr to array of submit_bo's */
__u64 relocs; /* in, ptr to array of submit_reloc's */
__u64 stream; /* in, ptr to cmdstream */
+ __u64 readbacks; /* in, ptr to array of submit_readback's */
+ __u32 nr_readbacks; /* in, number of submit_readback's */
+ __u32 padding;
};
/* The normal way to synchronize with the GPU is just to CPU_PREP on
--
2.9.3
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