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gustavo@padovan.org, christian.koenig@amd.com, andi.shyti@kernel.org, arnd@arndb.de, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, surenb@google.com, mcgrof@kernel.org, petr.pavlu@suse.com, da.gomez@kernel.org, samitolvanen@google.com, paulmck@kernel.org, frederic@kernel.org, neeraj.upadhyay@kernel.org, joelagnelf@nvidia.com, josh@joshtriplett.org, urezki@gmail.com, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, qiang.zhang@linux.dev, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, chuck.lever@oracle.com, neil@brown.name, okorniev@redhat.com, Dai.Ngo@oracle.com, tom@talpey.com, trondmy@kernel.org, anna@kernel.org, kees@kernel.org, bigeasy@linutronix.de, clrkwllms@kernel.org, mark.rutland@arm.com, ada.coupriediaz@arm.com, kristina.martsenko@arm.com, wangkefeng.wang@huawei.com, broonie@kernel.org, kevin.brodsky@arm.com, dwmw@amazon.co.uk, shakeel.butt@linux.dev, ast@kernel.org, ziy@nvidia.com, yuzhao@google.com, baolin.wang@linux.alibaba.com, usamaarif642@gmail.com, joel.granados@kernel.org, richard.weiyang@gmail.com, geert+renesas@glider.be, tim.c.chen@linux.intel.com, linux@treblig.org, alexander.shishkin@linux.intel.com, lillian@star-ark.net, chenhuacai@kernel.org, francesco@valla.it, guoweikang.kernel@gmail.com, link@vivo.com, jpoimboe@kernel.org, masahiroy@kernel.org, brauner@kernel.org, thomas.weissschuh@linutronix.de, oleg@redhat.com, mjguzik@gmail.com, andrii@kernel.org, wangfushuai@baidu.com, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, linux-i2c@vger.kernel.org, linux-arch@vger.kernel.org, linux-modules@vger.kernel.org, rcu@vger.kernel.org, linux-nfs@vger.kernel.org, linux-rt-devel@lists.linux.dev Subject: [PATCH v17 07/47] dept: distinguish each kernel context from another Date: Thu, 2 Oct 2025 17:12:07 +0900 Message-Id: <20251002081247.51255-8-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20251002081247.51255-1-byungchul@sk.com> References: <20251002081247.51255-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSb0xTZxSH99773ntLQ81dNfFOjVsaCYnzz2bYOB+I0UTi/UJC5oxhc9Fq L7YBqraC1sRYpCCiso6kGCkRKLN0LQi20VFmF8DZDYuxBcXCiliCYkUgwRZSFLSw+e05v/Pk 5JzkiEhpiFojUqlPCBq1PF9Gi7F4Mrlhc3LaU+VX1sUMGCjuxBCLlmOobW2modx5lQL/DQeC ubdmEkrd7zEsVHkZiMb/ZaA6UEXCxN0ZBKbwGA1XIsUYpq2XENS8MDMQubcbrGOLBIx1nkew UJ0HdRZXwjL5ETSEh0l42ZbI+8dWQI/pIg2TgVoC6s95KChpbKXB/ayDgcDEOwJC1VUEOJxZ 4DNaCDBfKSHA1PIHAXGrnYHexhAGqz4FzA/6KRi11TDgdYwzcGPyIQU9TwcoGPm7jILf9c8Y cA7eQxB9FCagvCOGwTP0JTSU/YrhjqcHQ/lCFIG3fZSA/o5aGi613aJAb55LXN/po6DP4cfQ Oh4kwOf9B8P1JwEC/L9cpiBofI6gZcpC71Dwdtdtgm++1oz4t/NViI9eLyH5UmOivPt6muQN rpO8Z7Ye8+6aYYY3/DnE8PXOQt7w1yTFu2wb+cY7EYJvmIlRvNN+gc5O+UGcoRDyVUWCZuv2 g2Jl0BBDx0b3nXIMllF6ZM2sQEkijk3jfrtvIj+yZf4mvcQ0m8oFg/HlfBX7Bee6/IJaYpL1 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Gw3e0yYCbnS9JJNMiOvTFxBchaMG4/Svhyiu8mIl4gb6jYjrvarFOb0hvD7u7ME5nWMfd9Xd SXH9wbcU5/xtIbhnZSx3pmkWV1vipTndw4/0uoVbxIt38enKbF49Z0myWNGiC6I9bZv32z4c JXORsOw4ihKxTCJb1l9NRZhiprEtLSE8wrHMFNZxqp2MMM64J7HvPDMjHMOsYWsKXo/eCSaB /RWyEhGWMPPZa9dc5L/Myaytqm40J4pZwDb73aMeadij79FhBiS2oDEVKFapys6QK9Pnz9ak KXJUyv2zd2Zm2FH4m4SDg2fuot7mFfWIESHZOIknwauQkvJsTU5GPWJFuCxWkmxtVUglu+Q5 B3h15g713nReU48mighZnGTVZj5ZyqTIs/g0nt/Dq/+rmCgqPhedC3Q/zeh+uml5caPKtN5y Z2rCRsb2wk52SK4krqSt/akGXWrfHdHqY7sPJRZuKNVHQ/Thwg0xDcPTv/gaU293rC6PKqxe v+hnjDBt68PxzpNJ2y8ef+Bp8BGhBY40cBfUC2fHfthmT+k7kaIYs1GeFP8o19Iw+U/t0ved 0ja/cpuM0Cjk82bgao38Lwy29yNJAwAA 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" Each unique kernel context, in dept's point of view, should be identified on every entrance to kernel mode e.g. system call or user oriented fault. Otherwise, dept may track meaningless dependencies across different kernel context. Plus, in order to update kernel context id at the very beginning of each entrance, arch code support is required, that could be configured by CONFIG_ARCH_HAS_DEPT_SUPPORT. Signed-off-by: Byungchul Park --- include/linux/dept.h | 29 ++++++++++------- include/linux/sched.h | 10 +++--- kernel/dependency/dept.c | 67 ++++++++++++++++++++-------------------- lib/Kconfig.debug | 5 ++- 4 files changed, 61 insertions(+), 50 deletions(-) diff --git a/include/linux/dept.h b/include/linux/dept.h index 5f0d2d8c8cbe..cb1b1beea077 100644 --- a/include/linux/dept.h +++ b/include/linux/dept.h @@ -26,11 +26,16 @@ struct task_struct; #define DEPT_MAX_SUBCLASSES_USR (DEPT_MAX_SUBCLASSES / DEPT_MAX_SUBCLASSE= S_EVT) #define DEPT_MAX_SUBCLASSES_CACHE 2 =20 -#define DEPT_SIRQ 0 -#define DEPT_HIRQ 1 -#define DEPT_IRQS_NR 2 -#define DEPT_SIRQF (1UL << DEPT_SIRQ) -#define DEPT_HIRQF (1UL << DEPT_HIRQ) +enum { + DEPT_CXT_SIRQ =3D 0, + DEPT_CXT_HIRQ, + DEPT_CXT_IRQS_NR, + DEPT_CXT_PROCESS =3D DEPT_CXT_IRQS_NR, + DEPT_CXTS_NR +}; + +#define DEPT_SIRQF (1UL << DEPT_CXT_SIRQ) +#define DEPT_HIRQF (1UL << DEPT_CXT_HIRQ) =20 struct dept_ecxt; struct dept_iecxt { @@ -95,8 +100,8 @@ struct dept_class { /* * for tracking IRQ dependencies */ - struct dept_iecxt iecxt[DEPT_IRQS_NR]; - struct dept_iwait iwait[DEPT_IRQS_NR]; + struct dept_iecxt iecxt[DEPT_CXT_IRQS_NR]; + struct dept_iwait iwait[DEPT_CXT_IRQS_NR]; =20 /* * classified by a map embedded in task_struct, @@ -208,8 +213,8 @@ struct dept_ecxt { /* * where the IRQ-enabled happened */ - unsigned long enirq_ip[DEPT_IRQS_NR]; - struct dept_stack *enirq_stack[DEPT_IRQS_NR]; + unsigned long enirq_ip[DEPT_CXT_IRQS_NR]; + struct dept_stack *enirq_stack[DEPT_CXT_IRQS_NR]; =20 /* * where the event context started @@ -253,8 +258,8 @@ struct dept_wait { /* * where the IRQ wait happened */ - unsigned long irq_ip[DEPT_IRQS_NR]; - struct dept_stack *irq_stack[DEPT_IRQS_NR]; + unsigned long irq_ip[DEPT_CXT_IRQS_NR]; + struct dept_stack *irq_stack[DEPT_CXT_IRQS_NR]; =20 /* * where the wait happened @@ -384,6 +389,7 @@ extern void dept_event(struct dept_map *m, unsigned lon= g e_f, unsigned long ip, extern void dept_ecxt_exit(struct dept_map *m, unsigned long e_f, unsigned= long ip); extern void dept_sched_enter(void); extern void dept_sched_exit(void); +extern void dept_update_cxt(void); =20 static inline void dept_ecxt_enter_nokeep(struct dept_map *m) { @@ -431,6 +437,7 @@ struct dept_map { }; #define dept_ecxt_exit(m, e_f, ip) do { } while (0) #define dept_sched_enter() do { } while (0) #define dept_sched_exit() do { } while (0) +#define dept_update_cxt() do { } while (0) #define dept_ecxt_enter_nokeep(m) do { } while (0) #define dept_key_init(k) do { (void)(k); } while (0) #define dept_key_destroy(k) do { (void)(k); } while (0) diff --git a/include/linux/sched.h b/include/linux/sched.h index ddb162201ba1..05c3f8a45405 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -830,19 +830,19 @@ struct dept_task { int wait_hist_pos; =20 /* - * sequential id to identify each IRQ context + * sequential id to identify each context */ - unsigned int irq_id[DEPT_IRQS_NR]; + unsigned int cxt_id[DEPT_CXTS_NR]; =20 /* * for tracking IRQ-enabled points with cross-event */ - unsigned int wgen_enirq[DEPT_IRQS_NR]; + unsigned int wgen_enirq[DEPT_CXT_IRQS_NR]; =20 /* * for keeping up-to-date IRQ-enabled points */ - unsigned long enirq_ip[DEPT_IRQS_NR]; + unsigned long enirq_ip[DEPT_CXT_IRQS_NR]; =20 /* * for reserving a current stack instance at each operation @@ -896,7 +896,7 @@ struct dept_task { .wait_hist =3D { { .wait =3D NULL, } }, \ .ecxt_held_pos =3D 0, \ .wait_hist_pos =3D 0, \ - .irq_id =3D { 0U }, \ + .cxt_id =3D { 0U }, \ .wgen_enirq =3D { 0U }, \ .enirq_ip =3D { 0UL }, \ .stack =3D NULL, \ diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c index dfe9dfdb6991..953e1b81a81f 100644 --- a/kernel/dependency/dept.c +++ b/kernel/dependency/dept.c @@ -230,9 +230,9 @@ static struct dept_class *dep_tc(struct dept_dep *d) =20 static const char *irq_str(int irq) { - if (irq =3D=3D DEPT_SIRQ) + if (irq =3D=3D DEPT_CXT_SIRQ) return "softirq"; - if (irq =3D=3D DEPT_HIRQ) + if (irq =3D=3D DEPT_CXT_HIRQ) return "hardirq"; return "(unknown)"; } @@ -410,7 +410,7 @@ static void initialize_class(struct dept_class *c) { int i; =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) { + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) { struct dept_iecxt *ie =3D &c->iecxt[i]; struct dept_iwait *iw =3D &c->iwait[i]; =20 @@ -436,7 +436,7 @@ static void initialize_ecxt(struct dept_ecxt *e) { int i; =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) { + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) { e->enirq_stack[i] =3D NULL; e->enirq_ip[i] =3D 0UL; } @@ -452,7 +452,7 @@ static void initialize_wait(struct dept_wait *w) { int i; =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) { + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) { w->irq_stack[i] =3D NULL; w->irq_ip[i] =3D 0UL; } @@ -491,7 +491,7 @@ static void destroy_ecxt(struct dept_ecxt *e) { int i; =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) if (e->enirq_stack[i]) put_stack(e->enirq_stack[i]); if (e->class) @@ -507,7 +507,7 @@ static void destroy_wait(struct dept_wait *w) { int i; =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) if (w->irq_stack[i]) put_stack(w->irq_stack[i]); if (w->class) @@ -665,7 +665,7 @@ static void print_diagram(struct dept_dep *d) const char *tc_n =3D tc->sched_map ? "" : (tc->name ?: "(unknown)"= ); =20 irqf =3D e->enirqf & w->irqf; - for_each_set_bit(irq, &irqf, DEPT_IRQS_NR) { + for_each_set_bit(irq, &irqf, DEPT_CXT_IRQS_NR) { if (!firstline) pr_warn("\nor\n\n"); firstline =3D false; @@ -698,7 +698,7 @@ static void print_dep(struct dept_dep *d) const char *tc_n =3D tc->sched_map ? "" : (tc->name ?: "(unknown)"= ); =20 irqf =3D e->enirqf & w->irqf; - for_each_set_bit(irq, &irqf, DEPT_IRQS_NR) { + for_each_set_bit(irq, &irqf, DEPT_CXT_IRQS_NR) { pr_warn("%s has been enabled:\n", irq_str(irq)); print_ip_stack(e->enirq_ip[irq], e->enirq_stack[irq]); pr_warn("\n"); @@ -866,7 +866,7 @@ static void bfs(void *root, struct bfs_ops *ops, void *= in, void **out) */ =20 static unsigned long cur_enirqf(void); -static int cur_irq(void); +static int cur_cxt(void); static unsigned int cur_ctxt_id(void); =20 static struct dept_iecxt *iecxt(struct dept_class *c, int irq) @@ -1443,7 +1443,7 @@ static void add_dep(struct dept_ecxt *e, struct dept_= wait *w) if (d) { check_dl_bfs(d); =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) { + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) { struct dept_iwait *fiw =3D iwait(fc, i); struct dept_iecxt *found_ie; struct dept_iwait *found_iw; @@ -1487,7 +1487,7 @@ static void add_wait(struct dept_class *c, unsigned l= ong ip, struct dept_task *dt =3D dept_task(); struct dept_wait *w; unsigned int wg; - int irq; + int cxt; int i; =20 if (DEPT_WARN_ON(!valid_class(c))) @@ -1503,9 +1503,9 @@ static void add_wait(struct dept_class *c, unsigned l= ong ip, w->wait_stack =3D get_current_stack(); w->sched_sleep =3D sched_sleep; =20 - irq =3D cur_irq(); - if (irq < DEPT_IRQS_NR) - add_iwait(c, irq, w); + cxt =3D cur_cxt(); + if (cxt =3D=3D DEPT_CXT_HIRQ || cxt =3D=3D DEPT_CXT_SIRQ) + add_iwait(c, cxt, w); =20 /* * Avoid adding dependency between user aware nested ecxt and @@ -1579,7 +1579,7 @@ static struct dept_ecxt_held *add_ecxt(struct dept_ma= p *m, eh->sub_l =3D sub_l; =20 irqf =3D cur_enirqf(); - for_each_set_bit(irq, &irqf, DEPT_IRQS_NR) + for_each_set_bit(irq, &irqf, DEPT_CXT_IRQS_NR) add_iecxt(c, irq, e, false); =20 del_ecxt(e); @@ -1728,7 +1728,7 @@ static void do_event(struct dept_map *m, struct dept_= map *real_m, add_dep(eh->ecxt, wh->wait); } =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) { + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) { struct dept_ecxt *e; =20 if (before(dt->wgen_enirq[i], wg)) @@ -1775,7 +1775,7 @@ static void disconnect_class(struct dept_class *c) call_rcu(&d->rh, del_dep_rcu); } =20 - for (i =3D 0; i < DEPT_IRQS_NR; i++) { + for (i =3D 0; i < DEPT_CXT_IRQS_NR; i++) { stale_iecxt(iecxt(c, i)); stale_iwait(iwait(c, i)); } @@ -1800,27 +1800,21 @@ static unsigned long cur_enirqf(void) return 0UL; } =20 -static int cur_irq(void) +static int cur_cxt(void) { if (lockdep_softirq_context(current)) - return DEPT_SIRQ; + return DEPT_CXT_SIRQ; if (lockdep_hardirq_context()) - return DEPT_HIRQ; - return DEPT_IRQS_NR; + return DEPT_CXT_HIRQ; + return DEPT_CXT_PROCESS; } =20 static unsigned int cur_ctxt_id(void) { struct dept_task *dt =3D dept_task(); - int irq =3D cur_irq(); + int cxt =3D cur_cxt(); =20 - /* - * Normal process context - */ - if (irq =3D=3D DEPT_IRQS_NR) - return 0U; - - return dt->irq_id[irq] | (1UL << irq); + return dt->cxt_id[cxt] | (1UL << cxt); } =20 static void enirq_transition(int irq) @@ -1877,7 +1871,7 @@ static void dept_enirq(unsigned long ip) =20 flags =3D dept_enter(); =20 - for_each_set_bit(irq, &irqf, DEPT_IRQS_NR) { + for_each_set_bit(irq, &irqf, DEPT_CXT_IRQS_NR) { dt->enirq_ip[irq] =3D ip; enirq_transition(irq); } @@ -1923,6 +1917,13 @@ void noinstr dept_hardirqs_off(void) dept_task()->hardirqs_enabled =3D false; } =20 +void noinstr dept_update_cxt(void) +{ + struct dept_task *dt =3D dept_task(); + + dt->cxt_id[DEPT_CXT_PROCESS] +=3D 1UL << DEPT_CXTS_NR; +} + /* * Ensure it's the outmost softirq context. */ @@ -1930,7 +1931,7 @@ void dept_softirq_enter(void) { struct dept_task *dt =3D dept_task(); =20 - dt->irq_id[DEPT_SIRQ] +=3D 1UL << DEPT_IRQS_NR; + dt->cxt_id[DEPT_CXT_SIRQ] +=3D 1UL << DEPT_CXTS_NR; } =20 /* @@ -1940,7 +1941,7 @@ void noinstr dept_hardirq_enter(void) { struct dept_task *dt =3D dept_task(); =20 - dt->irq_id[DEPT_HIRQ] +=3D 1UL << DEPT_IRQS_NR; + dt->cxt_id[DEPT_CXT_HIRQ] +=3D 1UL << DEPT_CXTS_NR; } =20 void dept_sched_enter(void) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index b9cff0bec6f2..3669b069337b 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1365,9 +1365,12 @@ config DEBUG_PREEMPT =20 menu "Lock Debugging (spinlocks, mutexes, etc...)" =20 +config ARCH_HAS_DEPT_SUPPORT + bool + config DEPT bool "Dependency tracking (EXPERIMENTAL)" - depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT + depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT && ARCH_HAS_DEPT_SUPPORT select DEBUG_SPINLOCK select DEBUG_MUTEXES if !PREEMPT_RT select DEBUG_RT_MUTEXES if RT_MUTEXES --=20 2.17.1