[IGT PATCH RFC] tools: Introduce intel_cgroup tool

[Matt Roper <matthew.d.roper@intel.com>]

intel_cgroup is used to modify i915 cgroup parameters.  At the moment only a
single parameter is supported (GPU priority offset).  In the future the driver
may support additional parameters as well (e.g., limits on memory usage).

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
---
 tools/Makefile.sources |   1 +
 tools/intel_cgroup.c   | 103 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 tools/intel_cgroup.c

diff --git a/tools/Makefile.sources b/tools/Makefile.sources
index abd23a0f..b30216c4 100644
--- a/tools/Makefile.sources
+++ b/tools/Makefile.sources
@@ -11,6 +11,7 @@ tools_prog_lists =		\
 	intel_reg		\
 	intel_backlight		\
 	intel_bios_dumper	\
+	intel_cgroup		\
 	intel_display_crc	\
 	intel_display_poller	\
 	intel_forcewaked	\
diff --git a/tools/intel_cgroup.c b/tools/intel_cgroup.c
new file mode 100644
index 00000000..ce781b08
--- /dev/null
+++ b/tools/intel_cgroup.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright © 2018 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 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 <fcntl.h>
+#include <getopt.h>
+#include <i915_drm.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "igt.h"
+#include "xf86drm.h"
+#include "xf86drmMode.h"
+
+#define I915_CGROUP_PARAM_PRIORITY_OFFSET       0x1
+
+char short_opts[] = "p:";
+struct option long_opts[] = {
+	{ "set-prio",	required_argument, NULL, 'p'},
+	{ 0 },
+};
+
+static void usage(void)
+{
+	puts("Usage:");
+	printf("  intel_cgroup --set-prio=<val> <cgroup-v2>\n");
+}
+
+int main(int argc, char **argv)
+{
+	int drm_fd, cgrp_fd;
+	struct drm_i915_cgroup_param req;
+	int opt, ret;
+	struct {
+		bool do_prio;
+		int prio_val;
+	} updates = { 0 };
+
+	while ((opt = getopt_long(argc, argv, short_opts, long_opts, NULL)) != -1) {
+		switch (opt) {
+		case 'p':
+			updates.do_prio = true;
+			updates.prio_val = atoi(optarg);
+			break;
+		default:
+			igt_assert(false);
+		}
+	}
+
+	if (argc - optind != 1) {
+		usage();
+		return 1;
+	}
+
+	drm_fd = drm_open_driver(DRIVER_INTEL);
+	if (drm_fd < 0) {
+		perror("Invalid DRM device");
+		return 1;
+	}
+
+	cgrp_fd = open(argv[optind], O_RDONLY|O_DIRECTORY, 0);
+	if (cgrp_fd < 0) {
+		perror("Invalid cgroup directory");
+		return 1;
+	}
+
+	req.cgroup_fd = cgrp_fd;
+	req.flags = 0;
+
+	if (updates.do_prio) {
+		req.param = I915_CGROUP_PARAM_PRIORITY_OFFSET;
+		req.value = updates.prio_val;
+
+		ret = drmIoctl(drm_fd, DRM_IOCTL_I915_CGROUP_SETPARAM, &req);
+		if (ret)
+			perror("Failed to set cgroup parameter");
+	}
+
+	close(cgrp_fd);
+	close(drm_fd);
+
+	return ret;
+}
-- 
2.14.3

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