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Subject[PATCH v3 01/10] VFIO: platform: registration of a dummy IRQ bypass producer
Date
Register a dummy producer with void callbacks

Signed-off-by: Eric Auger <eric.auger@linaro.org>

---

v2 -> v3:
- rename vfio_platform_irq_bypass_resume into *_start
---
drivers/vfio/platform/vfio_platform_irq.c | 32 +++++++++++++++++++++++++++
drivers/vfio/platform/vfio_platform_private.h | 2 ++
2 files changed, 34 insertions(+)

diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index 88bba57..b5cb8c7 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -20,6 +20,7 @@
#include <linux/types.h>
#include <linux/vfio.h>
#include <linux/irq.h>
+#include <linux/irqbypass.h>

#include "vfio_platform_private.h"

@@ -177,6 +178,27 @@ static irqreturn_t vfio_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}

+static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod)
+{
+}
+
+static void vfio_platform_irq_bypass_start(struct irq_bypass_producer *prod)
+{
+}
+
+static int vfio_platform_irq_bypass_add_consumer(
+ struct irq_bypass_producer *prod,
+ struct irq_bypass_consumer *cons)
+{
+ return 0;
+}
+
+static void vfio_platform_irq_bypass_del_consumer(
+ struct irq_bypass_producer *prod,
+ struct irq_bypass_consumer *cons)
+{
+}
+
static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
int fd, irq_handler_t handler)
{
@@ -186,6 +208,7 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,

if (irq->trigger) {
free_irq(irq->hwirq, irq);
+ irq_bypass_unregister_producer(&irq->producer);
kfree(irq->name);
eventfd_ctx_put(irq->trigger);
irq->trigger = NULL;
@@ -216,6 +239,15 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
return ret;
}

+ irq->producer.token = (void *)trigger;
+ irq->producer.irq = irq->hwirq;
+ irq->producer.add_consumer = vfio_platform_irq_bypass_add_consumer;
+ irq->producer.del_consumer = vfio_platform_irq_bypass_del_consumer;
+ irq->producer.stop = vfio_platform_irq_bypass_stop;
+ irq->producer.start = vfio_platform_irq_bypass_start;
+ ret = irq_bypass_register_producer(&irq->producer);
+ WARN_ON(ret);
+
if (!irq->masked)
enable_irq(irq->hwirq);

diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index 1c9b3d5..1d2d4d6 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -17,6 +17,7 @@

#include <linux/types.h>
#include <linux/interrupt.h>
+#include <linux/irqbypass.h>

#define VFIO_PLATFORM_OFFSET_SHIFT 40
#define VFIO_PLATFORM_OFFSET_MASK (((u64)(1) << VFIO_PLATFORM_OFFSET_SHIFT) - 1)
@@ -37,6 +38,7 @@ struct vfio_platform_irq {
spinlock_t lock;
struct virqfd *unmask;
struct virqfd *mask;
+ struct irq_bypass_producer producer;
};

struct vfio_platform_region {
--
1.9.1


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