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ANDROID: futex: Add vendor hook for wait queue

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Add the hook for the waiter list of futex to allow
vendor perform wait queue enhancement

Bug: 163431711

Signed-off-by: JianMin Liu <jian-min.liu@mediatek.com>
Change-Id: I68218b89c35b23aa5529099bb0bbbd031bdeafef
This commit is contained in:
JianMin Liu 2020-08-11 15:24:06 +08:00 committed by Todd Kjos
parent f39f3ac200
commit 3ba4b6d6a3
3 changed files with 33 additions and 1 deletions
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2
drivers/android/vendor_hooks.c
View File

@ -12,6 +12,7 @@
#include <trace/hooks/fpsimd.h>
#include <trace/hooks/binder.h>
#include <trace/hooks/rwsem.h>
#include <trace/hooks/futex.h>
/*
* Export tracepoints that act as a bare tracehook (ie: have no trace event
@ -38,3 +39,4 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_wake);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_write_finished);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_rwsem_list_add);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_alter_futex_plist_add);

26
include/trace/hooks/futex.h Normal file
View File

@ -0,0 +1,26 @@
/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM futex
#undef TRACE_INCLUDE_PATH
#define TRACE_INCLUDE_PATH trace/hooks
#if !defined(_TRACE_HOOK_FUTEX_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_HOOK_FUTEX_H
#include <linux/tracepoint.h>
#include <trace/hooks/vendor_hooks.h>
#include <linux/plist.h>
/*
* Following tracepoints are not exported in tracefs and provide a
* mechanism for vendor modules to hook and extend functionality
*/
#if defined(CONFIG_TRACEPOINTS) && defined(CONFIG_ANDROID_VENDOR_HOOKS)
DECLARE_HOOK(android_vh_alter_futex_plist_add,
TP_PROTO(struct plist_node *node,
struct plist_head *head,
bool *already_on_hb),
TP_ARGS(node, head, already_on_hb));
#else
#define trace_android_vh_alter_futex_plist_add(node, head, already_on_hb)
#endif
#endif /* _TRACE_HOOK_FUTEX_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

6
kernel/futex.c
View File

@ -43,6 +43,7 @@
#include <asm/futex.h>
#include "locking/rtmutex_common.h"
#include <trace/hooks/futex.h>
/*
* READ this before attempting to hack on futexes!
@ -2215,6 +2216,7 @@ queue_unlock(struct futex_hash_bucket *hb)
static inline void __queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
{
int prio;
bool already_on_hb = false;
/*
* The priority used to register this element is
@ -2227,7 +2229,9 @@ static inline void __queue_me(struct futex_q *q, struct futex_hash_bucket *hb)
prio = min(current->normal_prio, MAX_RT_PRIO);
plist_node_init(&q->list, prio);
plist_add(&q->list, &hb->chain);
trace_android_vh_alter_futex_plist_add(&q->list, &hb->chain, &already_on_hb);
if (!already_on_hb)
plist_add(&q->list, &hb->chain);
q->task = current;
}