[Intel-gfx] [PATCH i-g-t 1/2] lib/i915: Report scheduler caps for timeslicing
Chris Wilson
chris at chris-wilson.co.uk
Tue May 5 13:38:35 UTC 2020
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
include/drm-uapi/i915_drm.h | 8 +++++---
lib/i915/gem_scheduler.c | 15 +++++++++++++++
lib/i915/gem_scheduler.h | 1 +
3 files changed, 21 insertions(+), 3 deletions(-)
diff --git a/include/drm-uapi/i915_drm.h b/include/drm-uapi/i915_drm.h
index 2b55af13a..a222b6bfb 100644
--- a/include/drm-uapi/i915_drm.h
+++ b/include/drm-uapi/i915_drm.h
@@ -523,6 +523,7 @@ typedef struct drm_i915_irq_wait {
#define I915_SCHEDULER_CAP_PREEMPTION (1ul << 2)
#define I915_SCHEDULER_CAP_SEMAPHORES (1ul << 3)
#define I915_SCHEDULER_CAP_ENGINE_BUSY_STATS (1ul << 4)
+#define I915_SCHEDULER_CAP_TIMESLICING (1ul << 5)
#define I915_PARAM_HUC_STATUS 42
@@ -1040,9 +1041,10 @@ struct drm_i915_gem_exec_fence {
*/
__u32 handle;
-#define I915_EXEC_FENCE_WAIT (1<<0)
-#define I915_EXEC_FENCE_SIGNAL (1<<1)
-#define __I915_EXEC_FENCE_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_SIGNAL << 1))
+#define I915_EXEC_FENCE_WAIT (1u << 0)
+#define I915_EXEC_FENCE_SIGNAL (1u << 1)
+#define I915_EXEC_FENCE_WAIT_SUBMIT (1u << 2)
+#define __I915_EXEC_FENCE_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_WAIT_SUBMIT << 1))
__u32 flags;
};
diff --git a/lib/i915/gem_scheduler.c b/lib/i915/gem_scheduler.c
index 1beb85dec..a1dc694e5 100644
--- a/lib/i915/gem_scheduler.c
+++ b/lib/i915/gem_scheduler.c
@@ -131,6 +131,19 @@ 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_TIMESLICING;
+}
+
/**
* gem_scheduler_print_capability:
* @fd: open i915 drm file descriptor
@@ -151,6 +164,8 @@ void gem_scheduler_print_capability(int fd)
igt_info(" - With preemption enabled\n");
if (caps & I915_SCHEDULER_CAP_SEMAPHORES)
igt_info(" - With HW semaphores enabled\n");
+ if (caps & I915_SCHEDULER_CAP_TIMESLICING)
+ igt_info(" - With user timeslicing enabled\n");
if (caps & I915_SCHEDULER_CAP_ENGINE_BUSY_STATS)
igt_info(" - With engine busy statistics\n");
}
diff --git a/lib/i915/gem_scheduler.h b/lib/i915/gem_scheduler.h
index 14bd4cac4..d43e84bd2 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 */
--
2.26.2
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