linux-kernel - [PATCH] genirq: Notify clients whenever there is change in affinity

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Message-Id: <1490027777-29130-2-git-send-email-psodagud@codeaurora.org>
Date:   Mon, 20 Mar 2017 09:36:17 -0700
From:   Prasad Sodagudi <psodagud@...eaurora.org>
To:     tglx@...utronix.de
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        james.morse@....com, will.deacon@....com, catalin.marinas@....com,
        Prasad Sodagudi <psodagud@...eaurora.org>
Subject: [PATCH] genirq: Notify clients whenever there is change in affinity

During the cpu hotplug, irq are getting migrated from
hotplugging core but not getting notitfied to client
drivers. So add parameter to irq_do_set_affinity(),
to check and notify client drivers during the cpu hotplug.

Signed-off-by: Prasad Sodagudi <psodagud@...eaurora.org>
---
 kernel/irq/cpuhotplug.c | 2 +-
 kernel/irq/internals.h  | 2 +-
 kernel/irq/manage.c     | 9 ++++++---
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/kernel/irq/cpuhotplug.c b/kernel/irq/cpuhotplug.c
index 011f8c4..e293d9b 100644
--- a/kernel/irq/cpuhotplug.c
+++ b/kernel/irq/cpuhotplug.c
@@ -38,7 +38,7 @@ static bool migrate_one_irq(struct irq_desc *desc)
 	if (!c->irq_set_affinity) {
 		pr_debug("IRQ%u: unable to set affinity\n", d->irq);
 	} else {
-		int r = irq_do_set_affinity(d, affinity, false);
+		int r = irq_do_set_affinity(d, affinity, false, true);
 		if (r)
 			pr_warn_ratelimited("IRQ%u: set affinity failed(%d).\n",
 					    d->irq, r);
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index bc226e7..6abde48 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -114,7 +114,7 @@ static inline void unregister_handler_proc(unsigned int irq,
 extern void irq_set_thread_affinity(struct irq_desc *desc);
 
 extern int irq_do_set_affinity(struct irq_data *data,
-			       const struct cpumask *dest, bool force);
+		const struct cpumask *dest, bool force, bool notify);
 
 /* Inline functions for support of irq chips on slow busses */
 static inline void chip_bus_lock(struct irq_desc *desc)
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index a4afe5c..fea8c8e 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -197,7 +197,7 @@ static inline bool irq_move_pending(struct irq_data *data)
 #endif
 
 int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
-			bool force)
+			bool force, bool notify)
 {
 	struct irq_desc *desc = irq_data_to_desc(data);
 	struct irq_chip *chip = irq_data_get_irq_chip(data);
@@ -209,6 +209,9 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask,
 	case IRQ_SET_MASK_OK_DONE:
 		cpumask_copy(desc->irq_common_data.affinity, mask);
 	case IRQ_SET_MASK_OK_NOCOPY:
+		if (notify && desc->affinity_notify)
+			schedule_work(&desc->affinity_notify->work);
+
 		irq_set_thread_affinity(desc);
 		ret = 0;
 	}
@@ -227,7 +230,7 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
 		return -EINVAL;
 
 	if (irq_can_move_pcntxt(data)) {
-		ret = irq_do_set_affinity(data, mask, force);
+		ret = irq_do_set_affinity(data, mask, force, false);
 	} else {
 		irqd_set_move_pending(data);
 		irq_copy_pending(desc, mask);
@@ -375,7 +378,7 @@ static int setup_affinity(struct irq_desc *desc, struct cpumask *mask)
 		if (cpumask_intersects(mask, nodemask))
 			cpumask_and(mask, mask, nodemask);
 	}
-	irq_do_set_affinity(&desc->irq_data, mask, false);
+	irq_do_set_affinity(&desc->irq_data, mask, false, true);
 	return 0;
 }
 #else
-- 
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