[PATCH v4 02/13] VFIO: platform: registration of a dummy IRQ bypass producer
Eric Auger
eric.auger at linaro.org
Thu Nov 19 06:53:52 PST 2015
Register a dummy producer with void callbacks
Signed-off-by: Eric Auger <eric.auger at linaro.org>
---
v3 -> v3:
- replace WARN_ON by pr_info() in case irq_bypass_register_producer
fails
v2 -> v3:
- rename vfio_platform_irq_bypass_resume into *_start
---
drivers/vfio/platform/vfio_platform_irq.c | 34 +++++++++++++++++++++++++++
drivers/vfio/platform/vfio_platform_private.h | 2 ++
2 files changed, 36 insertions(+)
diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index 46d4750..ab7658a 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)
{
@@ -187,6 +209,7 @@ static int vfio_set_trigger(struct vfio_platform_device *vdev, int index,
if (irq->trigger) {
irq_clear_status_flags(irq->hwirq, IRQ_NOAUTOEN);
free_irq(irq->hwirq, irq);
+ irq_bypass_unregister_producer(&irq->producer);
kfree(irq->name);
eventfd_ctx_put(irq->trigger);
irq->trigger = NULL;
@@ -217,6 +240,17 @@ 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);
+ if (ret)
+ pr_info("irq bypass producer (token %p) registration fails: %d\n",
+ irq->producer.token, 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 42816dd..979c191 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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