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dmarc=none (p=none dis=none) header.from=sk.com; spf=pass smtp.mailfrom=sk.com; arc=none smtp.client-ip=166.125.252.92 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sk.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sk.com X-AuditID: a67dfc5b-669ff7000002311f-54-682af77101aa From: Byungchul Park To: linux-kernel@vger.kernel.org Cc: kernel_team@skhynix.com, torvalds@linux-foundation.org, damien.lemoal@opensource.wdc.com, linux-ide@vger.kernel.org, adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, will@kernel.org, tglx@linutronix.de, rostedt@goodmis.org, joel@joelfernandes.org, sashal@kernel.org, daniel.vetter@ffwll.ch, duyuyang@gmail.com, johannes.berg@intel.com, tj@kernel.org, tytso@mit.edu, willy@infradead.org, david@fromorbit.com, amir73il@gmail.com, gregkh@linuxfoundation.org, kernel-team@lge.com, linux-mm@kvack.org, akpm@linux-foundation.org, mhocko@kernel.org, minchan@kernel.org, hannes@cmpxchg.org, vdavydov.dev@gmail.com, sj@kernel.org, jglisse@redhat.com, dennis@kernel.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, vbabka@suse.cz, ngupta@vflare.org, linux-block@vger.kernel.org, josef@toxicpanda.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, jlayton@kernel.org, dan.j.williams@intel.com, hch@infradead.org, djwong@kernel.org, dri-devel@lists.freedesktop.org, rodrigosiqueiramelo@gmail.com, melissa.srw@gmail.com, hamohammed.sa@gmail.com, harry.yoo@oracle.com, chris.p.wilson@intel.com, gwan-gyeong.mun@intel.com, max.byungchul.park@gmail.com, boqun.feng@gmail.com, longman@redhat.com, yskelg@gmail.com, yunseong.kim@ericsson.com, yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v16 41/42] dept: implement a basic unit test for dept Date: Mon, 19 May 2025 18:18:25 +0900 Message-Id: <20250519091826.19752-42-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250519091826.19752-1-byungchul@sk.com> References: <20250519091826.19752-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSeUiTcRzG+/3e09XqZV1vGRWDLrs0Or6d2P0WCEFEdNFWvrShLptpGQme YbMNs3QdZstirbnK3vVHpgtzzLLIrGwe6TKpSLzI2sqyYxr98+XheXg+338ellA8oiayWt1h Ua9TxyppGSnrHlE899C3ME142ePZ4P+aTULhbQcNdbdKEDjupmHo8GyEhkAXgp/PnhNgzq9D cOVdKwF3q30IXLZ0Gl69Hwn1/l4aavJzaMi4epuGF50DGFoK8jCUSFHw1vqRhKe5xRjMHTRc NGfg4PmEod9qZ8CaOg3abRcYGHgXATU+LwWu5tlwvqiFhgpXDQnV99oxvLpfSIPP8YeCp9WP SQiYQqHutJGCmz3FNHQGrARY/b0MvKy0YKi2jIPSzCDwxJffFDwyVmI4ce0OhvqmcgQPstsw SA4vDW5/FwanlE/Aj+seBO2mbgayTvUzcDHNhCAnq4CEzJZF8PN78POlrxGQdrmUhJu/vChy peAociDB3dVLCJnOI8IP/2tacAUspPCkmBfKLrQyQuaDZkawSImC0xYmXK3owMKVPj8lSPaT tCD15TGCobseCz21tcyWSTtlK6LFWG2SqJ+/SiXTGNoycPzZjUcDTiOVijzLDSiE5bmFfLnp DPFff//iGNI0N4NvbOwf0mO4qbzT+JEyIBlLcN7hfMOlJjQYjObW81JZA2NALEty0/g2++pB W84t5m9531D/mFP4ktLKIU5I0G/OcQ9VFdwivr6kiBxk8pw5hDe1euh/hQn8Q1sjmYvkFjTM jhRaXVKcWhu7cJ4mWac9Om//wTgJBedlTRnYdQ/11W2tQhyLlCPkpa5ZGgWlTkpIjqtCPEso x8jtzpkahTxanXxM1B/cq0+MFROqUChLKsfLFwSORCu4A+rDYowoxov6/ylmQyamoqzVk9fE fJiQXTCqJzG30Bd56Np2lW/6wFjP4vRNrTLtUpVZ9p5bVrE2fMON/VpWA0xPJ/N5j8RVhNb8 On4jsq17n5iWcqz8uG73zvPjw4uww7QuMOP3uZTceHrOjgxDumrb8iXuvKxhtoh1qn29bqSe FFMbtWmznDd+jmpvWv9SSSZo1BFhhD5B/Rd3CCqzWgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAAzWSfUzMcRzHfX/PHcdvp/FbabjNJPPQJj6Tp/6wfvO8GYYNt/zmjrq401W2 pvSwuuqWh0TqOsWV6yJ32UJn53JHmkS5kko1okkZ3RGRK/PPe++93/u83v98GFxygwxgFMqT gkopi5ZSIkK0LTx1yYnvIfLl7WX+4BnJJKDolpmC5puVCMw1KRgMOCOhzTuI4Nez5zgU5Dcj uNrbhUONqxuBreIMBS3vpkOrZ5iChvxsClLLblHw4tMYBp0Xz2FQadkKb439BDTmlWJQMEDB lYJUzCcfMRg1mmgwJi+AvopCGsZ6Q6Gh201CfXEDCbaOxXBZ30lBna2BAFdtHwYt94oo6DaP k9DoekKAVxcIzWdzSagaKqXgk9eIg9EzTMNLuwEDl2EWVKf5qBnf/pDwONeOQca12xi0vr6P 4EFmDwYWs5uCes8gBlZLPg4/y50I+nSfaUjPGaXhSooOQXb6RQLSOsPg1w/fcvFIKKSUVBNQ 9duNNqzjzXoz4usHh3E+zRrP//S8onib10DwT0s5/m5hF82nPeigeYMljrdWhPBldQMYf/Wr h+QtpiyKt3w9R/Paz60YP9TURO8I2idac1iIVmgE1bJ1h0RybU8qdvxCZILXmksmI2e4Fvkx HLuC+/HNjE94il3ItbePTnp/dh5nze0ntUjE4Kx7KtdW/BpNFDPZjZzlbhutRQxDsAu4HlPE RCxmV3I33W/If8y5XGW1fZLj58s7susnTyVsGNdaqSfykMiAppiQv0KpiZEposOWqo/JE5WK hKVRsTEW5HsgY9LY2Vo00hLpQCyDpNPE1bZFcgkp06gTYxyIY3Cpv9hkDZZLxIdliacEVexB VVy0oHagQIaQzhZv2iMckrBHZCeFY4JwXFD9bzHGLyAZlfyeE9NlNiXMd2jWF735Mjvq+tic V0XSvfPJ3rWbL+k+DHX2z9j+4f3eoMZZ9w8UxqcEr76dszPPXvxwl/784qPx2xWu2NVRdUJm lpXT6cuDRp6XSac9YpSag/vD28dPl2RVRbSUrsFzHjubIvt3X7I7k+JWOe5s3SP+8vDMM2/W lkApoZbLQkNwlVr2F1s4Efg8AwAA X-CFilter-Loop: Reflected Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Implement CONFIG_DEPT_UNIT_TEST introducing a kernel module that runs basic unit test for dept. Signed-off-by: Byungchul Park --- include/linux/dept_unit_test.h | 67 +++++++++++ kernel/dependency/Makefile | 1 + kernel/dependency/dept.c | 12 ++ kernel/dependency/dept_unit_test.c | 173 +++++++++++++++++++++++++++++ lib/Kconfig.debug | 12 ++ 5 files changed, 265 insertions(+) create mode 100644 include/linux/dept_unit_test.h create mode 100644 kernel/dependency/dept_unit_test.c diff --git a/include/linux/dept_unit_test.h b/include/linux/dept_unit_test.h new file mode 100644 index 000000000000..7612b4e97e69 --- /dev/null +++ b/include/linux/dept_unit_test.h @@ -0,0 +1,67 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * DEPT unit test + * + * Started by Byungchul Park : + * + * Copyright (c) 2025 SK hynix, Inc., Byungchul Park + */ + +#ifndef __LINUX_DEPT_UNIT_TEST_H +#define __LINUX_DEPT_UNIT_TEST_H + +#if defined(CONFIG_DEPT_UNIT_TEST) || defined(CONFIG_DEPT_UNIT_TEST_MODULE) +struct dept_ut { + bool circle_detected; + bool recover_circle_detected; + + int ecxt_stack_total_cnt; + int wait_stack_total_cnt; + int evnt_stack_total_cnt; + int ecxt_stack_valid_cnt; + int wait_stack_valid_cnt; + int evnt_stack_valid_cnt; +}; + +extern struct dept_ut dept_ut_results; + +static inline void dept_ut_circle_detect(void) +{ + dept_ut_results.circle_detected =3D true; +} +static inline void dept_ut_recover_circle_detect(void) +{ + dept_ut_results.recover_circle_detected =3D true; +} +static inline void dept_ut_ecxt_stack_account(bool valid) +{ + dept_ut_results.ecxt_stack_total_cnt++; + + if (valid) + dept_ut_results.ecxt_stack_valid_cnt++; +} +static inline void dept_ut_wait_stack_account(bool valid) +{ + dept_ut_results.wait_stack_total_cnt++; + + if (valid) + dept_ut_results.wait_stack_valid_cnt++; +} +static inline void dept_ut_evnt_stack_account(bool valid) +{ + dept_ut_results.evnt_stack_total_cnt++; + + if (valid) + dept_ut_results.evnt_stack_valid_cnt++; +} +#else +struct dept_ut {}; + +#define dept_ut_circle_detect() do { } while (0) +#define dept_ut_recover_circle_detect() do { } while (0) +#define dept_ut_ecxt_stack_account(v) do { } while (0) +#define dept_ut_wait_stack_account(v) do { } while (0) +#define dept_ut_evnt_stack_account(v) do { } while (0) + +#endif +#endif /* __LINUX_DEPT_UNIT_TEST_H */ diff --git a/kernel/dependency/Makefile b/kernel/dependency/Makefile index 92f165400187..fc584ca87124 100644 --- a/kernel/dependency/Makefile +++ b/kernel/dependency/Makefile @@ -2,3 +2,4 @@ =20 obj-$(CONFIG_DEPT) +=3D dept.o obj-$(CONFIG_DEPT) +=3D dept_proc.o +obj-$(CONFIG_DEPT_UNIT_TEST) +=3D dept_unit_test.o diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c index c65bb0c6dad2..a08d0e16978b 100644 --- a/kernel/dependency/dept.c +++ b/kernel/dependency/dept.c @@ -78,8 +78,12 @@ #include #include #include +#include #include "dept_internal.h" =20 +struct dept_ut dept_ut_results; +EXPORT_SYMBOL_GPL(dept_ut_results); + static int dept_stop; static int dept_per_cpu_ready; =20 @@ -826,6 +830,10 @@ static void print_dep(struct dept_dep *d) pr_warn("(wait to wake up)\n"); print_ip_stack(0, e->ewait_stack); } + + dept_ut_ecxt_stack_account(valid_stack(e->ecxt_stack)); + dept_ut_wait_stack_account(valid_stack(w->wait_stack)); + dept_ut_evnt_stack_account(valid_stack(e->event_stack)); } } =20 @@ -920,6 +928,8 @@ static void print_circle(struct dept_class *c) dump_stack(); =20 dept_outworld_exit(); + + dept_ut_circle_detect(); } =20 /* @@ -1021,6 +1031,8 @@ static void print_recover_circle(struct dept_event_si= te *es) dump_stack(); =20 dept_outworld_exit(); + + dept_ut_recover_circle_detect(); } =20 static void bfs_init_recover(void *node, void *in, void **out) diff --git a/kernel/dependency/dept_unit_test.c b/kernel/dependency/dept_un= it_test.c new file mode 100644 index 000000000000..88e846b9f876 --- /dev/null +++ b/kernel/dependency/dept_unit_test.c @@ -0,0 +1,173 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * DEPT unit test + * + * Started by Byungchul Park : + * + * Copyright (c) 2025 SK hynix, Inc., Byungchul Park + */ + +#include +#include +#include +#include +#include + +MODULE_DESCRIPTION("DEPT unit test"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Byungchul Park "); + +struct unit { + const char *name; + bool (*func)(void); + bool result; +}; + +static DEFINE_SPINLOCK(s1); +static DEFINE_SPINLOCK(s2); +static bool test_spin_lock_deadlock(void) +{ + dept_ut_results.circle_detected =3D false; + + spin_lock(&s1); + spin_lock(&s2); + spin_unlock(&s2); + spin_unlock(&s1); + + spin_lock(&s2); + spin_lock(&s1); + spin_unlock(&s1); + spin_unlock(&s2); + + return dept_ut_results.circle_detected; +} + +static DEFINE_MUTEX(m1); +static DEFINE_MUTEX(m2); +static bool test_mutex_lock_deadlock(void) +{ + dept_ut_results.circle_detected =3D false; + + mutex_lock(&m1); + mutex_lock(&m2); + mutex_unlock(&m2); + mutex_unlock(&m1); + + mutex_lock(&m2); + mutex_lock(&m1); + mutex_unlock(&m1); + mutex_unlock(&m2); + + return dept_ut_results.circle_detected; +} + +static bool test_wait_event_deadlock(void) +{ + struct dept_map dmap1; + struct dept_map dmap2; + + sdt_map_init(&dmap1); + sdt_map_init(&dmap2); + + dept_ut_results.circle_detected =3D false; + + sdt_request_event(&dmap1); /* [S] */ + sdt_wait(&dmap2); /* [W] */ + sdt_event(&dmap1); /* [E] */ + + sdt_request_event(&dmap2); /* [S] */ + sdt_wait(&dmap1); /* [W] */ + sdt_event(&dmap2); /* [E] */ + + return dept_ut_results.circle_detected; +} + +static void dummy_event(void) +{ + /* Do nothing. */ +} + +static DEFINE_DEPT_EVENT_SITE(es1); +static DEFINE_DEPT_EVENT_SITE(es2); +static bool test_recover_deadlock(void) +{ + dept_ut_results.recover_circle_detected =3D false; + + dept_recover_event(&es1, &es2); + dept_recover_event(&es2, &es1); + + event_site(&es1, dummy_event); + event_site(&es2, dummy_event); + + return dept_ut_results.recover_circle_detected; +} + +static struct unit units[] =3D { + { + .name =3D "spin lock deadlock test", + .func =3D test_spin_lock_deadlock, + }, + { + .name =3D "mutex lock deadlock test", + .func =3D test_mutex_lock_deadlock, + }, + { + .name =3D "wait event deadlock test", + .func =3D test_wait_event_deadlock, + }, + { + .name =3D "event recover deadlock test", + .func =3D test_recover_deadlock, + }, +}; + +static int __init dept_ut_init(void) +{ + int i; + + lockdep_off(); + + dept_ut_results.ecxt_stack_valid_cnt =3D 0; + dept_ut_results.ecxt_stack_total_cnt =3D 0; + dept_ut_results.wait_stack_valid_cnt =3D 0; + dept_ut_results.wait_stack_total_cnt =3D 0; + dept_ut_results.evnt_stack_valid_cnt =3D 0; + dept_ut_results.evnt_stack_total_cnt =3D 0; + + for (i =3D 0; i < ARRAY_SIZE(units); i++) + units[i].result =3D units[i].func(); + + pr_info("\n"); + pr_info("******************************************\n"); + pr_info("DEPT unit test results\n"); + pr_info("******************************************\n"); + for (i =3D 0; i < ARRAY_SIZE(units); i++) { + pr_info("(%s) %s\n", units[i].result ? "pass" : "fail", + units[i].name); + } + pr_info("ecxt stack valid count =3D %d/%d\n", + dept_ut_results.ecxt_stack_valid_cnt, + dept_ut_results.ecxt_stack_total_cnt); + pr_info("wait stack valid count =3D %d/%d\n", + dept_ut_results.wait_stack_valid_cnt, + dept_ut_results.wait_stack_total_cnt); + pr_info("event stack valid count =3D %d/%d\n", + dept_ut_results.evnt_stack_valid_cnt, + dept_ut_results.evnt_stack_total_cnt); + pr_info("******************************************\n"); + pr_info("\n"); + + lockdep_on(); + + return 0; +} + +static void dept_ut_cleanup(void) +{ + /* + * Do nothing for now. + */ +} + +module_init(dept_ut_init); +module_exit(dept_ut_cleanup); diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index ec840c672846..8db2a8136418 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1404,6 +1404,18 @@ config DEPT_AGGRESSIVE_TIMEOUT_WAIT that timeout is used to avoid a deadlock. Say N if you'd like to avoid verbose reports. =20 +config DEPT_UNIT_TEST + tristate "unit test for DEPT" + depends on DEBUG_KERNEL && DEPT + default n + help + This option provides a kernel module that runs unit test for + DEPT. + + Say Y if you want DEPT unit test to be built into the kernel. + Say M if you want DEPT unit test to build as a module. + Say N if you are unsure. + config LOCK_DEBUGGING_SUPPORT bool depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT --=20 2.17.1