linux-kernel - [RFC v2 6/9] irq: bypass: add active field on producer side

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Date:	Mon,  6 Jul 2015 15:24:40 +0200
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, christoffer.dall@...aro.org,
	marc.zyngier@....com, avi.kivity@...il.com, mtosatti@...hat.com,
	feng.wu@...el.com, joro@...tes.org, b.reynal@...tualopensystems.com
Cc:	linux-kernel@...r.kernel.org, patches@...aro.org,
	alex.williamson@...hat.com, pbonzini@...hat.com
Subject: [RFC v2 6/9] irq: bypass: add active field on producer side

An active boolean is introduced on producer side: it reflects whether
the source is active (at interrupt controller level or at VFIO level
- automasked -).

This is a temporary hack for ARM IRQ forwarding with vfio platform.
I think the connect and disconnect should become callbacks too.
This would make possible to handle error in the process. Typically
active could be returned by producer->stop and analyzed before going
further. in that case the list_add only if connect returns 0.

Signed-off-by: Eric Auger <eric.auger@...aro.org>
---
 include/linux/irqbypass.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/irqbypass.h b/include/linux/irqbypass.h
index 8f62235..c89c3a8 100644
--- a/include/linux/irqbypass.h
+++ b/include/linux/irqbypass.h
@@ -9,6 +9,8 @@ struct irq_bypass_producer {
 	struct list_head node;
 	void *token;
 	int irq; /* linux irq */
+	/* is irq active at irqchip or VFIO masked? */
+	bool active;
 	void (*stop)(struct irq_bypass_producer *);
 	void (*resume)(struct irq_bypass_producer *);
 	void (*add_consumer)(struct irq_bypass_producer *,
-- 
1.9.1

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