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Message-ID: <20240220171457.703-13-kprateek.nayak@amd.com>
Date: Tue, 20 Feb 2024 22:44:55 +0530
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>, "James E.J. Bottomley"
<James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>,
"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-parisc@...r.kernel.org>,
<linux-pm@...r.kernel.org>
Subject: [RFC PATCH 12/14] parisc/thread_info: Introduce TIF_NOTIFY_IPI flag
Add support for TIF_NOTIFY_IPI on PA-RISC. 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: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Cc: Helge Deller <deller@....de>
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-parisc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-pm@...r.kernel.org
Signed-off-by: K Prateek Nayak <kprateek.nayak@....com>
---
arch/parisc/include/asm/thread_info.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/parisc/include/asm/thread_info.h b/arch/parisc/include/asm/thread_info.h
index 1a58795f785c..35f1deeb8f36 100644
--- a/arch/parisc/include/asm/thread_info.h
+++ b/arch/parisc/include/asm/thread_info.h
@@ -52,6 +52,7 @@ struct thread_info {
#define TIF_SECCOMP 11 /* secure computing */
#define TIF_SYSCALL_TRACEPOINT 12 /* syscall tracepoint instrumentation */
#define TIF_NONBLOCK_WARNING 13 /* warned about wrong O_NONBLOCK usage */
+#define TIF_NOTIFY_IPI 14 /* Pending IPI on TIF_POLLLING idle CPU */
#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
@@ -65,6 +66,7 @@ struct thread_info {
#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
#define _TIF_SECCOMP (1 << TIF_SECCOMP)
#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
+#define _TIF_NOTIFY_IPI (1 << TIF_NOTIFY_IPI)
#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | \
_TIF_NEED_RESCHED | _TIF_NOTIFY_SIGNAL)
--
2.34.1
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