gem_wsim: Fence support

Add sync fence dependency support to workload steps.

Only one sync fence dependency per step is supported at the
moment.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/benchmarks/wsim/README b/benchmarks/wsim/README
index 5d2a90b2..617b1338 100644
--- a/benchmarks/wsim/README
+++ b/benchmarks/wsim/README
@@ -55,4 +55,30 @@ The above workload described in human language works like this:
 When workload descriptors are provided on the command line, commas must be used
 instead of new lines.
 
-Multiple dependencies can be given separated by forward slashes.
\ No newline at end of file
+Multiple dependencies can be given separated by forward slashes.
+
+Example:
+
+  1.VCS1.3000.0.1
+  1.RCS.3700.0.0
+  1.VCS2.2300.-1/-2.0
+
+I this case the last step has a data dependency on both first and second steps.
+
+Sync (fd) fences
+----------------
+
+Sync fences are also supported as dependencies.
+
+To use them put a "f<N>" token in the step dependecy list. N is this case the
+same relative step offset to the dependee batch, but instead of the data
+dependency an output fence will be emitted at the dependee step, and passed in
+as a dependency in the current step.
+
+Example:
+
+  1.VCS1.3000.0.1
+  1.RCS.500-1000.-1/f-1.0
+
+In this case the second step will have both a data dependency and a sync fence
+dependency on the previous step.