gallium/ddebug: new pipe for hang detection and driver state dumping (v2)

v2: lots of improvements

This is like identity or trace, but simpler. It doesn't wrap most states.

Run with:
  GALLIUM_DDEBUG=1000 [executable]
where "executable" is the app and "1000" is in miliseconds, meaning that
the context will be considered hung if a fence fails to signal in 1000 ms.

If that happens, all shaders, context states, bound resources, draw
parameters, and driver debug information (if any) will be dumped into:
  /home/$username/dd_dumps/$processname_$pid_$index.

Note that the context is flushed after every draw/clear/copy/blit operation
and then waited for to find the exact call that hangs.

You can also do:
  GALLIUM_DDEBUG=always
to do the dumping after every draw/clear/copy/blit operation without
flushing and waiting.

Examples of driver states that can be dumped are:
- Hardware status registers saying which hw block is busy (hung).
- Disassembled shaders in a human-readable form.
- The last submitted command buffer in a human-readable form.

v2: drop pipe-loader changes, drop SConscript
    rename dd.h -> dd_pipe.h

Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/target-helpers/inline_debug_helper.h b/src/gallium/auxiliary/target-helpers/inline_debug_helper.h
index d353ab8..2443bf2 100644
--- a/src/gallium/auxiliary/target-helpers/inline_debug_helper.h
+++ b/src/gallium/auxiliary/target-helpers/inline_debug_helper.h
@@ -11,6 +11,10 @@
  * one or more debug driver: rbug, trace.
  */
 
+#ifdef GALLIUM_DDEBUG
+#include "ddebug/dd_public.h"
+#endif
+
 #ifdef GALLIUM_TRACE
 #include "trace/tr_public.h"
 #endif
@@ -30,6 +34,10 @@
 static inline struct pipe_screen *
 debug_screen_wrap(struct pipe_screen *screen)
 {
+#if defined(GALLIUM_DDEBUG)
+   screen = ddebug_screen_create(screen);
+#endif
+
 #if defined(GALLIUM_RBUG)
    screen = rbug_screen_create(screen);
 #endif