1 files changed, 128 insertions, 0 deletions
diff --git a/lib/i915/gem_submission.c b/lib/i915/gem_submission.c
new file mode 100644
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+++ b/lib/i915/gem_submission.c
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+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <stdbool.h>
+
+#include "igt_core.h"
+#include "igt_sysfs.h"
+
+#include "i915/gem_submission.h"
+
+/**
+ * SECTION:gem_submission
+ * @short_description: Helpers for determining submission method
+ * @title: GEM Submission
+ *
+ * This helper library contains functions used for getting information on
+ * currently used hardware submission method. Different generations of hardware
+ * support different submission backends, currently we're distinguishing 3
+ * different methods: legacy ringbuffer submission, execlists, GuC submission.
+ * For legacy ringbuffer submission, there's also a variation where we're using
+ * semaphores for synchronization between engines.
+ */
+
+/**
+ * gem_submission_method:
+ * @fd: open i915 drm file descriptor
+ *
+ * Returns: Submission method bitmap.
+ */
+unsigned gem_submission_method(int fd)
+{
+	unsigned flags = 0;
+	bool active;
+	int dir;
+
+	dir = igt_sysfs_open_parameters(fd);
+	if (dir < 0)
+		return 0;
+
+	active = igt_sysfs_get_boolean(dir, "enable_guc_submission");
+	if (active) {
+		flags |= GEM_SUBMISSION_GUC | GEM_SUBMISSION_EXECLISTS;
+		goto out;
+	}
+
+	active = igt_sysfs_get_boolean(dir, "enable_execlists");
+	if (active) {
+		flags |= GEM_SUBMISSION_EXECLISTS;
+		goto out;
+	}
+
+	active = igt_sysfs_get_boolean(dir, "semaphores");
+	if (active) {
+		flags |= GEM_SUBMISSION_SEMAPHORES;
+	}
+
+out:
+	close(dir);
+	return flags;
+}
+
+/**
+ * gem_submission_print_method:
+ * @fd: open i915 drm file descriptor
+ *
+ * Helper for pretty-printing currently used submission method
+ */
+void gem_submission_print_method(int fd)
+{
+	const unsigned flags = gem_submission_method(fd);
+
+	if (flags & GEM_SUBMISSION_GUC) {
+		igt_info("Using GuC submission\n");
+		return;
+	}
+
+	if (flags & GEM_SUBMISSION_EXECLISTS) {
+		igt_info("Using Execlists submission\n");
+		return;
+	}
+
+	igt_info("Using Legacy submission%s\n",
+		 flags & GEM_SUBMISSION_SEMAPHORES ? ", with semaphores" : "");
+}
+
+/**
+ * gem_has_semaphores:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether the driver is using semaphores for
+ * synchronization between engines.
+ */
+bool gem_has_semaphores(int fd)
+{
+	return gem_submission_method(fd) & GEM_SUBMISSION_SEMAPHORES;
+}
+
+/**
+ * gem_has_execlists:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether the driver is using execlists as a
+ * hardware submission method.
+ */
+bool gem_has_execlists(int fd)
+{
+	return gem_submission_method(fd) & GEM_SUBMISSION_EXECLISTS;
+}