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From: K Prateek Nayak <kprateek.nayak@amd.com>
To: <linux-kernel@vger.kernel.org>
CC: "Gautham R. Shenoy" <gautham.shenoy@amd.com>, K Prateek Nayak
	<kprateek.nayak@amd.com>, Dinh Nguyen <dinguyen@kernel.org>, "Rafael J.
 Wysocki" <rafael@kernel.org>, Daniel Lezcano <daniel.lezcano@linaro.org>,
	Ingo Molnar <mingo@redhat.com>, Peter Zijlstra <peterz@infradead.org>, "Juri
 Lelli" <juri.lelli@redhat.com>, Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>, Steven Rostedt
	<rostedt@goodmis.org>, Ben Segall <bsegall@google.com>, Mel Gorman
	<mgorman@suse.de>, Daniel Bristot de Oliveira <bristot@redhat.com>, "Valentin
 Schneider" <vschneid@redhat.com>, Al Viro <viro@zeniv.linux.org.uk>,
	<linux-pm@vger.kernel.org>
Subject: [RFC PATCH 13/14] nios2/thread_info: Introduce TIF_NOTIFY_IPI flag
Date: Tue, 20 Feb 2024 22:44:56 +0530
Message-ID: <20240220171457.703-14-kprateek.nayak@amd.com>
In-Reply-To: <20240220171457.703-1-kprateek.nayak@amd.com>
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Add support for TIF_NOTIFY_IPI on Nios II. 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: Dinh Nguyen <dinguyen@kernel.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Vincent Guittot <vincent.guittot@linaro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ben Segall <bsegall@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Cc: linux-pm@vger.kernel.org
Signed-off-by: K Prateek Nayak <kprateek.nayak@amd.com>
---
 arch/nios2/include/asm/thread_info.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/nios2/include/asm/thread_info.h b/arch/nios2/include/asm/thread_info.h
index 5abac9893b32..24882fd5ad11 100644
--- a/arch/nios2/include/asm/thread_info.h
+++ b/arch/nios2/include/asm/thread_info.h
@@ -79,6 +79,7 @@ static inline struct thread_info *current_thread_info(void)
 #define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
 #define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
 #define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal() */
+#define TIF_NOTIFY_IPI		10	/* Pending IPI on TIF_POLLLING idle CPU */
 
 #define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling
 					   TIF_NEED_RESCHED */
@@ -91,6 +92,7 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
+#define _TIF_NOTIFY_IPI		(1 << TIF_NOTIFY_IPI)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 
 /* work to do on interrupt/exception return */
-- 
2.34.1