lib/i915: Extract helpers for determining scheduler capabilities

Couple of tests are using either determining scheduler capabilities or
pretty printing. Let's move those to helpers in lib. We can also keep
the value obtained from getparam static.

v2: Break the trend of expanding ioctl_wrappers

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Cc: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Katarzyna Dec <katarzyna.dec@intel.com>
Cc: Petri Latvala <petri.latvala@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Katarzyna Dec <katarzyna.dec@intel.com>
Acked-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>

2 files changed, 162 insertions, 0 deletions

diff --git a/lib/i915/gem_scheduler.c b/lib/i915/gem_scheduler.c
new file mode 100644
index 00000000..ad156306
--- /dev/null
+++ b/lib/i915/gem_scheduler.c
@@ -0,0 +1,125 @@
+/*
+ * 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 <errno.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+#include "igt_core.h"
+#include "ioctl_wrappers.h"
+
+#include "i915/gem_scheduler.h"
+
+#define LOCAL_I915_PARAM_HAS_SCHEDULER		41
+
+/**
+ * SECTION:gem_scheduler
+ * @short_description: Helpers for querying scheduler capabilities
+ * @title: GEM Scheduler
+ *
+ * This helper library contains functions used for getting information on
+ * currently used scheduling model.
+ */
+
+/**
+ * gem_scheduler_capability:
+ * @fd: open i915 drm file descriptor
+ *
+ * Returns: Scheduler capability bitmap.
+ */
+unsigned gem_scheduler_capability(int fd)
+{
+	static int caps = -1;
+
+	if (caps < 0) {
+		struct drm_i915_getparam gp;
+
+		memset(&gp, 0, sizeof(gp));
+		gp.param = LOCAL_I915_PARAM_HAS_SCHEDULER;
+		gp.value = &caps;
+
+		caps = 0;
+		ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp));
+		errno = 0;
+	}
+
+	return caps;
+}
+
+/**
+ * gem_has_scheduler:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether the driver has scheduling capability.
+ */
+bool gem_scheduler_enabled(int fd)
+{
+	return gem_scheduler_capability(fd) &
+	       LOCAL_I915_SCHEDULER_CAP_ENABLED;
+}
+
+/**
+ * gem_has_ctx_priority:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether the driver supports assigning custom
+ * priorities to contexts from userspace.
+ */
+bool gem_scheduler_has_ctx_priority(int fd)
+{
+	return gem_scheduler_capability(fd) &
+	       LOCAL_I915_SCHEDULER_CAP_PRIORITY;
+}
+
+/**
+ * gem_has_preemption:
+ * @fd: open i915 drm file descriptor
+ *
+ * Feature test macro to query whether the driver supports preempting active
+ * (currently executing on HW) workloads.
+ */
+bool gem_scheduler_has_preemption(int fd)
+{
+	return gem_scheduler_capability(fd) &
+	       LOCAL_I915_SCHEDULER_CAP_PREEMPTION;
+}
+
+/**
+ * gem_scheduler_print_capability:
+ * @fd: open i915 drm file descriptor
+ *
+ * Helper for pretty-printing scheduler capability.
+ */
+void gem_scheduler_print_capability(int fd)
+{
+	unsigned caps = gem_scheduler_capability(fd);
+
+	if (!caps)
+		return;
+
+	igt_info("Has kernel scheduler\n");
+	if (caps & LOCAL_I915_SCHEDULER_CAP_PRIORITY)
+		igt_info(" - With priority sorting\n");
+	if (caps & LOCAL_I915_SCHEDULER_CAP_PREEMPTION)
+		igt_info(" - With preemption enabled\n");
+}
diff --git a/lib/i915/gem_scheduler.h b/lib/i915/gem_scheduler.h
new file mode 100644
index 00000000..9fcb0266
--- /dev/null
+++ b/lib/i915/gem_scheduler.h
@@ -0,0 +1,37 @@
+/*
+ * 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.
+ */
+
+#ifndef GEM_SCHEDULER_H
+#define GEM_SCHEDULER_H
+
+#define LOCAL_I915_SCHEDULER_CAP_ENABLED	(1 << 0)
+#define LOCAL_I915_SCHEDULER_CAP_PRIORITY	(1 << 1)
+#define LOCAL_I915_SCHEDULER_CAP_PREEMPTION	(1 << 2)
+
+unsigned gem_scheduler_capability(int fd);
+bool gem_scheduler_enabled(int fd);
+bool gem_scheduler_has_ctx_priority(int fd);
+bool gem_scheduler_has_preemption(int fd);
+void gem_scheduler_print_capability(int fd);
+
+#endif /* GEM_SCHEDULER_H */