Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
tests/Makefile.sources | 3 +
tests/i915/sysfs_defaults.c | 110 ++++++++++++++++++++++++++++++++++++
tests/meson.build | 1 +
3 files changed, 114 insertions(+)
create mode 100644 tests/i915/sysfs_defaults.c
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index ec535ba85..2581c0429 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -111,6 +111,9 @@ TESTS_progs = \
TESTS_progs += api_intel_bb
api_intel_bb_SOURCES = i915/api_intel_bb.c
+TESTS_progs += sysfs_defaults
+sysfs_defaults_SOURCES = i915/sysfs_defaults.c
+
TESTS_progs += sysfs_heartbeat_interval
sysfs_heartbeat_interval_SOURCES = i915/sysfs_heartbeat_interval.c
diff --git a/tests/i915/sysfs_defaults.c b/tests/i915/sysfs_defaults.c
new file mode 100644
index 000000000..64c5eb373
--- /dev/null
+++ b/tests/i915/sysfs_defaults.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright © 2019 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 <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "drmtest.h"
+#include "i915/gem.h"
+#include "i915/gem_engine_topology.h"
+#include "igt_sysfs.h"
+
+static bool may_write(int dir, const char *file)
+{
+ struct stat st;
+
+ igt_assert(fstatat(dir, file, &st, 0) == 0);
+ return st.st_mode & 0222;
+}
+
+static void test_writable(int i915, int engine)
+{
+ struct dirent *de;
+ int defaults;
+ DIR *dir;
+
+ defaults = openat(engine, ".defaults", O_DIRECTORY);
+ igt_require(defaults != -1);
+
+ dir = fdopendir(engine);
+ while ((de = readdir(dir))) {
+ if (!(de->d_type & DT_REG))
+ continue;
+
+ if (!may_write(engine, de->d_name)) {
+ igt_debug("Skipping constant attr '%s'\n", de->d_name);
+ continue;
+ }
+
+ igt_debug("Checking attr '%s'\n", de->d_name);
+
+ /* Every attribute should have a default value */
+ igt_assert_f(faccessat(defaults, de->d_name, F_OK, 0) == 0,
+ "default value for %s not accessible\n",
+ de->d_name);
+
+ /* But no one is allowed to change it */
+ igt_assert_f(!may_write(defaults, de->d_name),
+ "default value for %s writable!\n",
+ de->d_name);
+
+ igt_assert_f(!igt_sysfs_set(defaults, de->d_name, "garbage"),
+ "write into default value of %s succeeded!\n",
+ de->d_name);
+ }
+ closedir(dir);
+}
+
+igt_main
+{
+ int i915 = -1, engines = -1;
+
+ igt_fixture {
+ int sys;
+
+ i915 = drm_open_driver(DRIVER_INTEL);
+ igt_require_gem(i915);
+ igt_allow_hang(i915, 0, 0);
+
+ sys = igt_sysfs_open(i915);
+ igt_require(sys != -1);
+
+ engines = openat(sys, "engine", O_RDONLY);
+ igt_require(engines != -1);
+
+ close(sys);
+ }
+
+ igt_subtest_with_dynamic("writable")
+ dyn_sysfs_engines(i915, engines, NULL, test_writable);
+
+ igt_fixture {
+ close(engines);
+ close(i915);
+ }
+}
diff --git a/tests/meson.build b/tests/meson.build
index 08200f26c..4f765da30 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -235,6 +235,7 @@ i915_progs = [
'i915_query',
'i915_selftest',
'i915_suspend',
+ 'sysfs_defaults',
'sysfs_heartbeat_interval',
'sysfs_preempt_timeout',
'sysfs_timeslice_duration',
--
2.28.0
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