linux-kernel - [RFC PATCH 10/12] xen/events: add xen_shutdown

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Message-ID: <20180612205619.28156-11-anchalag@amazon.com>
Date:   Tue, 12 Jun 2018 20:56:17 +0000
From:   Anchal Agarwal <anchalag@...zon.com>
To:     <tglx@...utronix.de>, <mingo@...hat.com>, <hpa@...or.com>,
        <x86@...nel.org>
CC:     <boris.ostrovsky@...cle.com>, <konrad.wilk@...cle.com>,
        <roger.pau@...rix.com>, <netdev@...r.kernel.org>,
        <jgross@...e.com>, <xen-devel@...ts.xenproject.org>,
        <linux-kernel@...r.kernel.org>, <kamatam@...zon.com>,
        <anchalag@...zon.com>, <fllinden@...zon.com>, <vallish@...zon.com>,
        <guruanb@...zon.com>, <eduval@...zon.com>, <rjw@...ysocki.net>,
        <pavel@....cz>, <len.brown@...el.com>, <linux-pm@...r.kernel.org>,
        <cyberax@...zon.com>
Subject: [RFC PATCH 10/12] xen/events: add xen_shutdown_pirqs helper function

From: Munehisa Kamata <kamatam@...zon.com>

Add a simple helper function to "shutdown" active PIRQs, which actually
closes event channels but keeps related IRQ structures intact. PM
suspend/hibernation code will rely on this.

Signed-off-by: Munehisa Kamata <kamatam@...zon.com>
Signed-off-by: Anchal Agarwal <anchalag@...zon.com>
Reviewed-by: Munehisa Kamata <kamatam@...zon.com>
Reviewed-by: Eduardo Valentin <eduval@...zon.com>
---
 drivers/xen/events/events_base.c | 12 ++++++++++++
 include/xen/events.h             |  1 +
 2 files changed, 13 insertions(+)

diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 762378f..88137c8 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1581,6 +1581,18 @@ void xen_irq_resume(void)
 	restore_pirqs();
 }
 
+void xen_shutdown_pirqs(void)
+{
+	struct irq_info *info;
+
+	list_for_each_entry(info, &xen_irq_list_head, list) {
+		if (info->type != IRQT_PIRQ || !VALID_EVTCHN(info->evtchn))
+			continue;
+
+		shutdown_pirq(irq_get_irq_data(info->irq));
+	}
+}
+
 static struct irq_chip xen_dynamic_chip __read_mostly = {
 	.name			= "xen-dyn",
 
diff --git a/include/xen/events.h b/include/xen/events.h
index c3e6bc6..e4d5ccb 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -70,6 +70,7 @@ static inline void notify_remote_via_evtchn(int port)
 void notify_remote_via_irq(int irq);
 
 void xen_irq_resume(void);
+void xen_shutdown_pirqs(void);
 
 /* Clear an irq's pending state, in preparation for polling on it */
 void xen_clear_irq_pending(int irq);
-- 
2.7.4