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Message-ID: <20240613181613.4329-12-kprateek.nayak@amd.com>
Date: Thu, 13 Jun 2024 18:16:10 +0000
From: K Prateek Nayak <kprateek.nayak@....com>
To: <linux-kernel@...r.kernel.org>
CC: "Gautham R. Shenoy" <gautham.shenoy@....com>, K Prateek Nayak
<kprateek.nayak@....com>, Guo Ren <guoren@...nel.org>, "Rafael J. Wysocki"
<rafael@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>, Ingo Molnar
<mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Juri Lelli
<juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>,
Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt
<rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman
<mgorman@...e.de>, Daniel Bristot de Oliveira <bristot@...hat.com>, "Valentin
Schneider" <vschneid@...hat.com>, <linux-csky@...r.kernel.org>,
<linux-pm@...r.kernel.org>
Subject: [PATCH v2 11/14] csky/thread_info: Introduce TIF_NOTIFY_IPI flag
Add support for TIF_NOTIFY_IPI on C-SKY. With TIF_NOTIFY_IPI, a sender
sending an IPI to an idle CPU in TIF_POLLING mode will set the
TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the
CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This
avoids spurious calls to schedule_idle() in cases where an IPI does not
necessarily wake up a task on the idle CPU.
Cc: Guo Ren <guoren@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Daniel Bristot de Oliveira <bristot@...hat.com>
Cc: Valentin Schneider <vschneid@...hat.com>
Cc: K Prateek Nayak <kprateek.nayak@....com>
Cc: linux-csky@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-pm@...r.kernel.org
Acked-by: Guo Ren <guoren@...nel.org>
Signed-off-by: K Prateek Nayak <kprateek.nayak@....com>
---
v1..v2:
o Collected the ack. Thank you :)
---
arch/csky/include/asm/thread_info.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h
index b5ed788f0c68..9bc7a037c476 100644
--- a/arch/csky/include/asm/thread_info.h
+++ b/arch/csky/include/asm/thread_info.h
@@ -61,6 +61,7 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_SYSCALL_TRACEPOINT 5 /* syscall tracepoint instrumentation */
#define TIF_SYSCALL_AUDIT 6 /* syscall auditing */
#define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */
+#define TIF_NOTIFY_IPI 8 /* Pending IPI on TIF_POLLLING idle CPU */
#define TIF_POLLING_NRFLAG 16 /* poll_idle() is TIF_NEED_RESCHED */
#define TIF_MEMDIE 18 /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK 20 /* restore signal mask in do_signal() */
@@ -73,6 +74,7 @@ static inline struct thread_info *current_thread_info(void)
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
+#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI)
#define _TIF_UPROBE (1 << TIF_UPROBE)
#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
#define _TIF_MEMDIE (1 << TIF_MEMDIE)
--
2.34.1
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