[PATCH v4 04/13] VFIO: platform: single handler using function pointer

[Eric Auger]

A single handler now is registered whatever the use case: automasked
or not. A function pointer is set according to the wished behavior
and the handler calls this function.

The irq lock is taken/released in the root handler. eventfd_signal can
be called in regions not allowed to sleep.

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

---

v4: creation
---
 drivers/vfio/platform/vfio_platform_irq.c     | 21 +++++++++++++++------
 drivers/vfio/platform/vfio_platform_private.h |  1 +
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/vfio/platform/vfio_platform_irq.c 
b/drivers/vfio/platform/vfio_platform_irq.c
index d4462fd..c58e0ad 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -148,11 +148,8 @@ static int vfio_platform_set_irq_unmask(struct 
vfio_platform_device *vdev,
 static irqreturn_t vfio_automasked_irq_handler(int irq, void *dev_id)
 {
        struct vfio_platform_irq *irq_ctx = dev_id;
-       unsigned long flags;
        int ret = IRQ_NONE;
 
-       spin_lock_irqsave(&irq_ctx->lock, flags);
-
        if (!irq_ctx->masked) {
                ret = IRQ_HANDLED;
 
@@ -161,8 +158,6 @@ static irqreturn_t vfio_automasked_irq_handler(int irq, 
void *dev_id)
                irq_ctx->masked = true;
        }
 
-       spin_unlock_irqrestore(&irq_ctx->lock, flags);
-
        if (ret == IRQ_HANDLED)
                eventfd_signal(irq_ctx->trigger, 1);
 
@@ -178,6 +173,19 @@ static irqreturn_t vfio_irq_handler(int irq, void *dev_id)
        return IRQ_HANDLED;
 }
 
+static irqreturn_t vfio_handler(int irq, void *dev_id)
+{
+       struct vfio_platform_irq *irq_ctx = dev_id;
+       unsigned long flags;
+       irqreturn_t ret;
+
+       spin_lock_irqsave(&irq_ctx->lock, flags);
+       ret = irq_ctx->handler(irq, dev_id);
+       spin_unlock_irqrestore(&irq_ctx->lock, flags);
+
+       return ret;
+}
+
 static void vfio_platform_irq_bypass_stop(struct irq_bypass_producer *prod)
 {
 }
@@ -230,9 +238,10 @@ static int vfio_set_trigger(struct vfio_platform_device 
*vdev, int index,
        }
 
        irq->trigger = trigger;
+       irq->handler = handler;
 
        irq_set_status_flags(irq->hwirq, IRQ_NOAUTOEN);
-       ret = request_irq(irq->hwirq, handler, 0, irq->name, irq);
+       ret = request_irq(irq->hwirq, vfio_handler, 0, irq->name, irq);
        if (ret) {
                kfree(irq->name);
                eventfd_ctx_put(trigger);
diff --git a/drivers/vfio/platform/vfio_platform_private.h 
b/drivers/vfio/platform/vfio_platform_private.h
index 55e8043..8a8c050 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -40,6 +40,7 @@ struct vfio_platform_irq {
        struct virqfd           *mask;
        struct irq_bypass_producer producer;
        bool                    forwarded;
+       irqreturn_t (*handler)(int irq, void *dev_id);
 };
 
 struct vfio_platform_region {
-- 
1.9.1

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