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 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.
Changes from v1 -> v2: - use a 16 bit value for signals - fix padding issues
Signed-off-by: Christian Gmeiner christian.gmeiner@gmail.com --- 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 c065c8308bbd..110cc73bf549 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 pad; + __u16 signal; /* in, pm signal */ + __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