First we introduce a smattering of infrastructure for writing selftests. The idea is that we have a test module that exercises a particular portion of the exported API, and that module provides a set of tests that can either be run as an ensemble via kselftest or individually via an igt harness (in this case igt/drm_mm). To accommodate selecting individual tests, we export a boolean parameter to control selection of each test - that is hidden inside a bunch of reusable boilerplate macros to keep writing the tests simple.
v2: Choose a random random_seed unless one is specified by the user. v3: More parameters to control max_iterations and max_prime of the tests.
Testcase: igt/drm_mm Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Acked-by: Christian König christian.koenig@amd.com Reviewed-by: Joonas Lahtinen joonas.lahtinen@linux.intel.com --- drivers/gpu/drm/Kconfig | 15 ++++ drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/selftests/drm_mm_selftests.h | 8 ++ drivers/gpu/drm/selftests/drm_selftest.c | 109 ++++++++++++++++++++++++++ drivers/gpu/drm/selftests/drm_selftest.h | 41 ++++++++++ drivers/gpu/drm/selftests/test-drm_mm.c | 58 ++++++++++++++ tools/testing/selftests/drivers/gpu/drm_mm.sh | 15 ++++ 7 files changed, 247 insertions(+) create mode 100644 drivers/gpu/drm/selftests/drm_mm_selftests.h create mode 100644 drivers/gpu/drm/selftests/drm_selftest.c create mode 100644 drivers/gpu/drm/selftests/drm_selftest.h create mode 100644 drivers/gpu/drm/selftests/test-drm_mm.c create mode 100755 tools/testing/selftests/drivers/gpu/drm_mm.sh
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 45a1c7468e88..29146fa83001 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -48,6 +48,21 @@ config DRM_DEBUG_MM
If in doubt, say "N".
+config DRM_DEBUG_MM_SELFTEST + tristate "kselftests for DRM range manager (struct drm_mm)" + depends on DRM + depends on DEBUG_KERNEL + select PRIME_NUMBERS + select DRM_LIB_RANDOM + default n + help + This option provides a kernel module that can be used to test + the DRM range manager (drm_mm) and its API. This option is not + useful for distributions or general kernels, but only for kernel + developers working on DRM and associated drivers. + + If in doubt, say "N". + config DRM_KMS_HELPER tristate depends on DRM diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 6bb416360ae4..c0d1aed8588b 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -38,6 +38,7 @@ drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o drm_kms_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o +obj-$(CONFIG_DRM_DEBUG_MM_SELFTEST) += selftests/test-drm_mm.o
CFLAGS_drm_trace_points.o := -I$(src)
diff --git a/drivers/gpu/drm/selftests/drm_mm_selftests.h b/drivers/gpu/drm/selftests/drm_mm_selftests.h new file mode 100644 index 000000000000..1610e0a63a5b --- /dev/null +++ b/drivers/gpu/drm/selftests/drm_mm_selftests.h @@ -0,0 +1,8 @@ +/* List each unit test as selftest(name, function) + * + * The name is used as both an enum and expanded as igt__name to create + * a module parameter. It must be unique and legal for a C identifier. + * + * Tests are executed in order by igt/drm_mm + */ +selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */ diff --git a/drivers/gpu/drm/selftests/drm_selftest.c b/drivers/gpu/drm/selftests/drm_selftest.c new file mode 100644 index 000000000000..e29ed9faef5b --- /dev/null +++ b/drivers/gpu/drm/selftests/drm_selftest.c @@ -0,0 +1,109 @@ +/* + * Copyright © 2016 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 <linux/compiler.h> + +#define selftest(name, func) __idx_##name, +enum { +#include TESTS +}; +#undef selftest + +#define selftest(n, f) [__idx_##n] = { .name = #n, .func = f }, +static struct drm_selftest { + bool enabled; + const char *name; + int (*func)(void *); +} selftests[] = { +#include TESTS +}; +#undef selftest + +/* Embed the line number into the parameter name so that we can order tests */ +#define param(n) __PASTE(igt__, __PASTE(__PASTE(__LINE__, __), n)) +#define selftest_0(n, func, id) \ +module_param_named(id, selftests[__idx_##n].enabled, bool, 0400); +#define selftest(n, func) selftest_0(n, func, param(n)) +#include TESTS +#undef selftest + +static void set_default_test_all(struct drm_selftest *st, unsigned long count) +{ + unsigned long i; + + for (i = 0; i < count; i++) + if (st[i].enabled) + return; + + for (i = 0; i < count; i++) + st[i].enabled = true; +} + +static int run_selftests(struct drm_selftest *st, + unsigned long count, + void *data) +{ + int err = 0; + + set_default_test_all(st, count); + + /* Tests are listed in natural order in drm_*_selftests.h */ + for (; count--; st++) { + if (!st->enabled) + continue; + + pr_debug("drm: Running %s\n", st->name); + err = st->func(data); + if (err) + break; + } + + if (WARN(err > 0 || err == -ENOTTY, + "%s returned %d, conflicting with selftest's magic values!\n", + st->name, err)) + err = -1; + + rcu_barrier(); + return err; +} + +static int __maybe_unused +__drm_subtests(const char *caller, + const struct drm_subtest *st, + int count, + void *data) +{ + int err; + + for (; count--; st++) { + pr_debug("Running %s/%s\n", caller, st->name); + err = st->func(data); + if (err) { + pr_err("%s: %s failed with error %d\n", + caller, st->name, err); + return err; + } + } + + return 0; +} diff --git a/drivers/gpu/drm/selftests/drm_selftest.h b/drivers/gpu/drm/selftests/drm_selftest.h new file mode 100644 index 000000000000..c784ec02ff53 --- /dev/null +++ b/drivers/gpu/drm/selftests/drm_selftest.h @@ -0,0 +1,41 @@ +/* + * Copyright © 2016 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 __DRM_SELFTEST_H__ +#define __DRM_SELFTEST_H__ + +struct drm_subtest { + int (*func)(void *data); + const char *name; +}; + +static int __drm_subtests(const char *caller, + const struct drm_subtest *st, + int count, + void *data); +#define drm_subtests(T, data) \ + __drm_subtests(__func__, T, ARRAY_SIZE(T), data) + +#define SUBTEST(x) { x, #x } + +#endif /* __DRM_SELFTEST_H__ */ diff --git a/drivers/gpu/drm/selftests/test-drm_mm.c b/drivers/gpu/drm/selftests/test-drm_mm.c new file mode 100644 index 000000000000..682f5f86f465 --- /dev/null +++ b/drivers/gpu/drm/selftests/test-drm_mm.c @@ -0,0 +1,58 @@ +/* + * Test cases for the drm_mm range manager + */ + +#define pr_fmt(fmt) "drm_mm: " fmt + +#include <linux/module.h> +#include <linux/prime_numbers.h> +#include <linux/slab.h> +#include <linux/random.h> +#include <linux/vmalloc.h> + +#include <drm/drm_mm.h> + +#include "../lib/drm_random.h" + +#define TESTS "drm_mm_selftests.h" +#include "drm_selftest.h" + +static unsigned int random_seed; +static unsigned int max_iterations = 8192; +static unsigned int max_prime = 128; + +static int igt_sanitycheck(void *ignored) +{ + pr_info("%s - ok!\n", __func__); + return 0; +} + +#include "drm_selftest.c" + +static int __init test_drm_mm_init(void) +{ + int err; + + while (!random_seed) + random_seed = get_random_int(); + + pr_info("Testing DRM range manger (struct drm_mm), with random_seed=0x%x max_iterations=%u max_prime=%u\n", + random_seed, max_iterations, max_prime); + err = run_selftests(selftests, ARRAY_SIZE(selftests), NULL); + + return err > 0 ? 0 : err; +} + +static void __exit test_drm_mm_exit(void) +{ +} + +module_init(test_drm_mm_init); +module_exit(test_drm_mm_exit); + +module_param(random_seed, uint, 0400); +module_param(max_iterations, uint, 0400); +module_param(max_prime, uint, 0400); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_LICENSE("GPL"); diff --git a/tools/testing/selftests/drivers/gpu/drm_mm.sh b/tools/testing/selftests/drivers/gpu/drm_mm.sh new file mode 100755 index 000000000000..96dd55c92799 --- /dev/null +++ b/tools/testing/selftests/drivers/gpu/drm_mm.sh @@ -0,0 +1,15 @@ +#!/bin/sh +# Runs API tests for struct drm_mm (DRM range manager) + +if ! /sbin/modprobe -n -q test-drm_mm; then + echo "drivers/gpu/drm_mm: [skip]" + exit 77 +fi + +if /sbin/modprobe -q test-drm_mm; then + /sbin/modprobe -q -r test-drm_mm + echo "drivers/gpu/drm_mm: ok" +else + echo "drivers/gpu/drm_mm: [FAIL]" + exit 1 +fi