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drm: Add some kselftests for the DRM range manager (struct drm_mm)
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> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161222083641.2691-7-chris@chris-wilson.co.uk
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7 changed files with 247 additions and 0 deletions
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@ -48,6 +48,21 @@ config DRM_DEBUG_MM
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If in doubt, say "N".
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config DRM_DEBUG_MM_SELFTEST
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tristate "kselftests for DRM range manager (struct drm_mm)"
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depends on DRM
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depends on DEBUG_KERNEL
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select PRIME_NUMBERS
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select DRM_LIB_RANDOM
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default n
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help
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This option provides a kernel module that can be used to test
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the DRM range manager (drm_mm) and its API. This option is not
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useful for distributions or general kernels, but only for kernel
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developers working on DRM and associated drivers.
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If in doubt, say "N".
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config DRM_KMS_HELPER
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tristate
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depends on DRM
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@ -38,6 +38,7 @@ drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o
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drm_kms_helper-$(CONFIG_DRM_DP_AUX_CHARDEV) += drm_dp_aux_dev.o
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obj-$(CONFIG_DRM_KMS_HELPER) += drm_kms_helper.o
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obj-$(CONFIG_DRM_DEBUG_MM_SELFTEST) += selftests/test-drm_mm.o
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CFLAGS_drm_trace_points.o := -I$(src)
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8
drivers/gpu/drm/selftests/drm_mm_selftests.h
Normal file
8
drivers/gpu/drm/selftests/drm_mm_selftests.h
Normal file
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@ -0,0 +1,8 @@
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/* List each unit test as selftest(name, function)
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*
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* The name is used as both an enum and expanded as igt__name to create
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* a module parameter. It must be unique and legal for a C identifier.
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*
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* Tests are executed in order by igt/drm_mm
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*/
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selftest(sanitycheck, igt_sanitycheck) /* keep first (selfcheck for igt) */
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109
drivers/gpu/drm/selftests/drm_selftest.c
Normal file
109
drivers/gpu/drm/selftests/drm_selftest.c
Normal file
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@ -0,0 +1,109 @@
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/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include <linux/compiler.h>
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#define selftest(name, func) __idx_##name,
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enum {
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#include TESTS
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};
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#undef selftest
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#define selftest(n, f) [__idx_##n] = { .name = #n, .func = f },
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static struct drm_selftest {
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bool enabled;
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const char *name;
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int (*func)(void *);
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} selftests[] = {
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#include TESTS
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};
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#undef selftest
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/* Embed the line number into the parameter name so that we can order tests */
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#define param(n) __PASTE(igt__, __PASTE(__PASTE(__LINE__, __), n))
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#define selftest_0(n, func, id) \
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module_param_named(id, selftests[__idx_##n].enabled, bool, 0400);
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#define selftest(n, func) selftest_0(n, func, param(n))
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#include TESTS
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#undef selftest
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static void set_default_test_all(struct drm_selftest *st, unsigned long count)
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{
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unsigned long i;
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for (i = 0; i < count; i++)
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if (st[i].enabled)
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return;
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for (i = 0; i < count; i++)
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st[i].enabled = true;
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}
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static int run_selftests(struct drm_selftest *st,
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unsigned long count,
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void *data)
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{
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int err = 0;
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set_default_test_all(st, count);
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/* Tests are listed in natural order in drm_*_selftests.h */
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for (; count--; st++) {
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if (!st->enabled)
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continue;
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pr_debug("drm: Running %s\n", st->name);
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err = st->func(data);
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if (err)
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break;
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}
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if (WARN(err > 0 || err == -ENOTTY,
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"%s returned %d, conflicting with selftest's magic values!\n",
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st->name, err))
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err = -1;
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rcu_barrier();
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return err;
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}
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static int __maybe_unused
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__drm_subtests(const char *caller,
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const struct drm_subtest *st,
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int count,
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void *data)
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{
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int err;
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for (; count--; st++) {
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pr_debug("Running %s/%s\n", caller, st->name);
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err = st->func(data);
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if (err) {
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pr_err("%s: %s failed with error %d\n",
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caller, st->name, err);
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return err;
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}
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}
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return 0;
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}
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41
drivers/gpu/drm/selftests/drm_selftest.h
Normal file
41
drivers/gpu/drm/selftests/drm_selftest.h
Normal file
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@ -0,0 +1,41 @@
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/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef __DRM_SELFTEST_H__
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#define __DRM_SELFTEST_H__
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struct drm_subtest {
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int (*func)(void *data);
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const char *name;
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};
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static int __drm_subtests(const char *caller,
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const struct drm_subtest *st,
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int count,
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void *data);
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#define drm_subtests(T, data) \
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__drm_subtests(__func__, T, ARRAY_SIZE(T), data)
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#define SUBTEST(x) { x, #x }
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#endif /* __DRM_SELFTEST_H__ */
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58
drivers/gpu/drm/selftests/test-drm_mm.c
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58
drivers/gpu/drm/selftests/test-drm_mm.c
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/*
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* Test cases for the drm_mm range manager
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*/
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#define pr_fmt(fmt) "drm_mm: " fmt
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#include <linux/module.h>
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#include <linux/prime_numbers.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/vmalloc.h>
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#include <drm/drm_mm.h>
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#include "../lib/drm_random.h"
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#define TESTS "drm_mm_selftests.h"
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#include "drm_selftest.h"
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static unsigned int random_seed;
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static unsigned int max_iterations = 8192;
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static unsigned int max_prime = 128;
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static int igt_sanitycheck(void *ignored)
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{
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pr_info("%s - ok!\n", __func__);
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return 0;
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}
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#include "drm_selftest.c"
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static int __init test_drm_mm_init(void)
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{
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int err;
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while (!random_seed)
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random_seed = get_random_int();
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pr_info("Testing DRM range manger (struct drm_mm), with random_seed=0x%x max_iterations=%u max_prime=%u\n",
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random_seed, max_iterations, max_prime);
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err = run_selftests(selftests, ARRAY_SIZE(selftests), NULL);
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return err > 0 ? 0 : err;
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}
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static void __exit test_drm_mm_exit(void)
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{
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}
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module_init(test_drm_mm_init);
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module_exit(test_drm_mm_exit);
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module_param(random_seed, uint, 0400);
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module_param(max_iterations, uint, 0400);
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module_param(max_prime, uint, 0400);
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL");
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15
tools/testing/selftests/drivers/gpu/drm_mm.sh
Executable file
15
tools/testing/selftests/drivers/gpu/drm_mm.sh
Executable file
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#!/bin/sh
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# Runs API tests for struct drm_mm (DRM range manager)
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if ! /sbin/modprobe -n -q test-drm_mm; then
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echo "drivers/gpu/drm_mm: [skip]"
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exit 77
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fi
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if /sbin/modprobe -q test-drm_mm; then
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/sbin/modprobe -q -r test-drm_mm
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echo "drivers/gpu/drm_mm: ok"
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else
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echo "drivers/gpu/drm_mm: [FAIL]"
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exit 1
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fi
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