[igt-dev] [i-g-t V3 1/2] lib/i915: find scheduler caps for timeslicing

[Tejas Upadhyay]

Check scheduler capability for timeslicing in appropriate
way, which requires wrappers to be created for IGT.

V3:
    removed conditional error - petri
V2: has_timeslice = has_semaphore && has_preemption ||
    has_guc_submission - Tvrtko

Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay at intel.com>
---
 lib/i915/gem_scheduler.c | 21 +++++++++++++++++++++
 lib/i915/gem_scheduler.h |  1 +
 2 files changed, 22 insertions(+)

diff --git a/lib/i915/gem_scheduler.c b/lib/i915/gem_scheduler.c
index 184da843..f59c451f 100644
--- a/lib/i915/gem_scheduler.c
+++ b/lib/i915/gem_scheduler.c
@@ -29,6 +29,7 @@
 #include "ioctl_wrappers.h"
 
 #include "i915/gem_scheduler.h"
+#include "i915/gem_submission.h"
 
 /**
  * SECTION:gem_scheduler
@@ -129,6 +130,22 @@ bool gem_scheduler_has_engine_busy_stats(int fd)
 		I915_SCHEDULER_CAP_ENGINE_BUSY_STATS;
 }
 
+/**
+ * gem_scheduler_has_timeslicing:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether the driver supports using HW preemption
+ * to implement timeslicing of userspace batches. This allows userspace to
+ * implement micro-level scheduling within their own batches.
+ */
+bool gem_scheduler_has_timeslicing(int fd)
+{
+	return ((gem_scheduler_capability(fd) &
+	        (I915_SCHEDULER_CAP_PREEMPTION |
+		 I915_SCHEDULER_CAP_SEMAPHORES))
+		|| gem_has_guc_submission(fd));
+}
+
 /**
  * gem_scheduler_print_capability:
  * @fd: open i915 drm file descriptor
@@ -151,4 +168,8 @@ void gem_scheduler_print_capability(int fd)
 		igt_info(" - With HW semaphores enabled\n");
 	if (caps & I915_SCHEDULER_CAP_ENGINE_BUSY_STATS)
 		igt_info(" - With engine busy statistics\n");
+	if ((caps & (I915_SCHEDULER_CAP_PREEMPTION
+		  | I915_SCHEDULER_CAP_SEMAPHORES))
+		|| gem_has_guc_submission(fd))
+		igt_info(" - With user timeslicing enabled\n");
 }
diff --git a/lib/i915/gem_scheduler.h b/lib/i915/gem_scheduler.h
index 14bd4cac..d43e84bd 100644
--- a/lib/i915/gem_scheduler.h
+++ b/lib/i915/gem_scheduler.h
@@ -32,6 +32,7 @@ bool gem_scheduler_has_ctx_priority(int fd);
 bool gem_scheduler_has_preemption(int fd);
 bool gem_scheduler_has_semaphores(int fd);
 bool gem_scheduler_has_engine_busy_stats(int fd);
+bool gem_scheduler_has_timeslicing(int fd);
 void gem_scheduler_print_capability(int fd);
 
 #endif /* GEM_SCHEDULER_H */
-- 
2.31.1