linux-kernel - [PATCH v4 18/24] dept: Distinguish each work from another

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Message-Id: <1646377603-19730-19-git-send-email-byungchul.park@lge.com>
Date:   Fri,  4 Mar 2022 16:06:37 +0900
From:   Byungchul Park <byungchul.park@....com>
To:     torvalds@...ux-foundation.org
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Subject: [PATCH v4 18/24] dept: Distinguish each work from another

Workqueue already provides concurrency control. By that, any wait in a
work doesn't prevents events in other works with the control enabled.
Thus, each work would better be considered a different context.

So let Dept assign a different context id to each work.

Signed-off-by: Byungchul Park <byungchul.park@....com>
---
 include/linux/dept.h     |  2 ++
 kernel/dependency/dept.c | 10 ++++++++++
 kernel/workqueue.c       |  3 +++
 3 files changed, 15 insertions(+)

diff --git a/include/linux/dept.h b/include/linux/dept.h
index 1a1c307..55c5ed5 100644
--- a/include/linux/dept.h
+++ b/include/linux/dept.h
@@ -486,6 +486,7 @@ struct dept_task {
 extern void dept_event_split_map(struct dept_map_each *me, struct dept_map_common *mc, unsigned long ip, const char *e_fn);
 extern void dept_ask_event_split_map(struct dept_map_each *me, struct dept_map_common *mc);
 extern void dept_kernel_enter(void);
+extern void dept_work_enter(void);
 
 /*
  * for users who want to manage external keys
@@ -527,6 +528,7 @@ struct dept_task {
 #define dept_event_split_map(me, mc, ip, e_fn)		do { } while (0)
 #define dept_ask_event_split_map(me, mc)		do { } while (0)
 #define dept_kernel_enter()				do { } while (0)
+#define dept_work_enter()				do { } while (0)
 #define dept_key_init(k)				do { (void)(k); } while (0)
 #define dept_key_destroy(k)				do { (void)(k); } while (0)
 #endif
diff --git a/kernel/dependency/dept.c b/kernel/dependency/dept.c
index 8f962ae..5d4efc3 100644
--- a/kernel/dependency/dept.c
+++ b/kernel/dependency/dept.c
@@ -1873,6 +1873,16 @@ void dept_disable_hardirq(unsigned long ip)
 	dept_exit(flags);
 }
 
+/*
+ * Assign a different context id to each work.
+ */
+void dept_work_enter(void)
+{
+	struct dept_task *dt = dept_task();
+
+	dt->cxt_id[DEPT_CXT_PROCESS] += (1UL << DEPT_CXTS_NR);
+}
+
 void dept_kernel_enter(void)
 {
 	struct dept_task *dt = dept_task();
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 33f1106..f5d762c 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -51,6 +51,7 @@
 #include <linux/sched/isolation.h>
 #include <linux/nmi.h>
 #include <linux/kvm_para.h>
+#include <linux/dept.h>
 
 #include "workqueue_internal.h"
 
@@ -2217,6 +2218,8 @@ static void process_one_work(struct worker *worker, struct work_struct *work)
 
 	lockdep_copy_map(&lockdep_map, &work->lockdep_map);
 #endif
+	dept_work_enter();
+
 	/* ensure we're on the correct CPU */
 	WARN_ON_ONCE(!(pool->flags & POOL_DISASSOCIATED) &&
 		     raw_smp_processor_id() != pool->cpu);
-- 
1.9.1