i965: Add a debug flag for counting cycles spent in each compiled shader.

This can be used for two purposes: Using hand-coded shaders to determine
per-instruction timings, or figuring out which shader to optimize in a
whole application.

Note that this doesn't cover the instructions that set up the message to
the URB/FB write -- we'd need to convert the MRF usage in these
instructions to GRFs so that our offsets/times don't overwrite our
shader outputs.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> (v1)

v2: Check the timestamp reset flag in the VS, which is apparently
    getting set fairly regularly in the range we watch, resulting in
    negative numbers getting added to our 32-bit counter, and thus large
    values added to our uint64_t.
v3: Rebase on reladdr changes, removing a new safety check that proved
    impossible to satisfy.  Add a comment to the AOP defs from Ken's
    review, and put them in a slightly more sensible spot.
v4: Check timestamp reset in the FS as well.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_vs_surface_state.c b/src/mesa/drivers/dri/i965/brw_vs_surface_state.c
index d70c36e..3985b48 100644
--- a/src/mesa/drivers/dri/i965/brw_vs_surface_state.c
+++ b/src/mesa/drivers/dri/i965/brw_vs_surface_state.c
@@ -138,9 +138,19 @@ const struct brw_tracked_state brw_vs_ubo_surfaces = {
 static void
 brw_vs_upload_binding_table(struct brw_context *brw)
 {
+   struct intel_context *intel = &brw->intel;
    uint32_t *bind;
    int i;
 
+   if (INTEL_DEBUG & DEBUG_SHADER_TIME) {
+      intel->vtbl.create_constant_surface(brw, brw->shader_time.bo, 0,
+                                          brw->shader_time.bo->size,
+                                          &brw->vs.surf_offset[SURF_INDEX_VS_SHADER_TIME]);
+
+      assert(brw->vs.prog_data->num_surfaces <= SURF_INDEX_VS_SHADER_TIME);
+      brw->vs.prog_data->num_surfaces = SURF_INDEX_VS_SHADER_TIME;
+   }
+
    /* CACHE_NEW_VS_PROG: Skip making a binding table if we don't use textures or
     * pull constants.
     */