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ANDROID: Add a vendor hook that allow a module to modify the wake flag

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android_vh_do_wake_up_sync:
  To modify the mode value of __wake_up_sync_key

 android_vh_set_wake_flags:
  To modify the wake flag from a module

Bug: 181743516
Signed-off-by: Namkyu Kim <namkyu78.kim@samsung.com>
Change-Id: I972e2469c3f139373d21f1e8c85974763388a693
This commit is contained in:
Namkyu Kim 2021-03-04 09:31:56 +09:00 committed by Todd Kjos
parent 16f20ce5ae
commit 97368fc2dc
4 changed files with 27 additions and 2 deletions
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2
drivers/android/vendor_hooks.c
View File

@ -164,3 +164,5 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ufs_prepare_command);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ufs_update_sysfs);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ufs_send_command);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_ufs_compl_command);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_wake_up_sync);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_set_wake_flags);

8
include/trace/hooks/sched.h
View File

@ -260,6 +260,14 @@ DECLARE_RESTRICTED_HOOK(android_rvh_check_preempt_wakeup,
TP_PROTO(struct rq *rq, struct task_struct *p, bool *preempt),
TP_ARGS(rq, p, preempt), 1);
DECLARE_HOOK(android_vh_do_wake_up_sync,
TP_PROTO(struct wait_queue_head *wq_head, int *done),
TP_ARGS(wq_head, done));
DECLARE_HOOK(android_vh_set_wake_flags,
TP_PROTO(int *wake_flags, unsigned int *mode),
TP_ARGS(wake_flags, mode));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_SCHED_H */

6
kernel/sched/wait.c
View File

@ -5,6 +5,7 @@
* (C) 2004 Nadia Yvette Chambers, Oracle
*/
#include "sched.h"
#include <trace/hooks/sched.h>
void __init_waitqueue_head(struct wait_queue_head *wq_head, const char *name, struct lock_class_key *key)
{
@ -184,10 +185,13 @@ EXPORT_SYMBOL_GPL(__wake_up_locked_key_bookmark);
void __wake_up_sync_key(struct wait_queue_head *wq_head, unsigned int mode,
void *key)
{
int wake_flags = WF_SYNC;
if (unlikely(!wq_head))
return;
__wake_up_common_lock(wq_head, mode, 1, WF_SYNC, key);
trace_android_vh_set_wake_flags(&wake_flags, &mode);
__wake_up_common_lock(wq_head, mode, 1, wake_flags, key);
}
EXPORT_SYMBOL_GPL(__wake_up_sync_key);

13
net/core/sock.c
View File

@ -135,6 +135,7 @@
#include <net/bpf_sk_storage.h>
#include <trace/events/sock.h>
#include <trace/hooks/sched.h>
#include <net/tcp.h>
#include <net/busy_poll.h>
@ -2885,9 +2886,19 @@ void sock_def_readable(struct sock *sk)
rcu_read_lock();
wq = rcu_dereference(sk->sk_wq);
if (skwq_has_sleeper(wq))
if (skwq_has_sleeper(wq)) {
int done = 0;
trace_android_vh_do_wake_up_sync(&wq->wait, &done);
if (done)
goto out;
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI |
EPOLLRDNORM | EPOLLRDBAND);
}
out:
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
rcu_read_unlock();
}