With this patch the VFIO user will be able to set an eventfd that can be
used in order to mask and unmask IRQs of platform devices.
Signed-off-by: Antonios Motakis <a.mota...@virtualopensystems.com>
---
drivers/vfio/platform/vfio_platform_irq.c | 48 +++++++++++++++++++++++++--
drivers/vfio/platform/vfio_platform_private.h | 2 ++
2 files changed, 48 insertions(+), 2 deletions(-)
diff --git a/drivers/vfio/platform/vfio_platform_irq.c
b/drivers/vfio/platform/vfio_platform_irq.c
index 90fa25a..4ea3d5a 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -45,11 +45,21 @@ static void vfio_platform_mask(struct vfio_platform_irq
*irq_ctx)
spin_unlock_irqrestore(&irq_ctx->lock, flags);
}
+static int vfio_platform_mask_handler(void *opaque, void *unused)
+{
+ struct vfio_platform_irq *irq_ctx = opaque;
+
+ vfio_platform_mask(irq_ctx);
+
+ return 0;
+}
+
static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev,
unsigned index, unsigned start,
unsigned count, uint32_t flags, void *data)
{
uint8_t irq_bitmap;
+ int32_t fd;
if (start != 0 || count != 1)
return -EINVAL;
@@ -75,7 +85,19 @@ static int vfio_platform_set_irq_mask(struct
vfio_platform_device *vdev,
vfio_platform_mask(&vdev->irqs[index]);
return 0;
- case VFIO_IRQ_SET_DATA_EVENTFD: /* XXX not implemented yet */
+ case VFIO_IRQ_SET_DATA_EVENTFD:
+ if (copy_from_user(&fd, data, sizeof(int32_t)))
+ return -EFAULT;
+
+ if (fd >= 0)
+ return virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_mask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].mask, fd);
+
+ virqfd_disable(&vdev->irqs[index].mask);
+ return 0;
+
default:
return -ENOTTY;
}
@@ -97,11 +119,21 @@ static void vfio_platform_unmask(struct vfio_platform_irq
*irq_ctx)
spin_unlock_irqrestore(&irq_ctx->lock, flags);
}
+static int vfio_platform_unmask_handler(void *opaque, void *unused)
+{
+ struct vfio_platform_irq *irq_ctx = opaque;
+
+ vfio_platform_unmask(irq_ctx);
+
+ return 0;
+}
+
static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev,
unsigned index, unsigned start,
unsigned count, uint32_t flags, void *data)
{
uint8_t irq_bitmap;
+ int32_t fd;
if (start != 0 || count != 1)
return -EINVAL;
@@ -123,7 +155,19 @@ static int vfio_platform_set_irq_unmask(struct
vfio_platform_device *vdev,
vfio_platform_unmask(&vdev->irqs[index]);
return 0;
- case VFIO_IRQ_SET_DATA_EVENTFD: /* XXX not implemented yet */
+ case VFIO_IRQ_SET_DATA_EVENTFD:
+ if (copy_from_user(&fd, data, sizeof(int32_t)))
+ return -EFAULT;
+
+ if (fd >= 0)
+ return virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_unmask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].unmask, fd);
+
+ virqfd_disable(&vdev->irqs[index].unmask);
+ return 0;
+
default:
return -ENOTTY;
}
diff --git a/drivers/vfio/platform/vfio_platform_private.h
b/drivers/vfio/platform/vfio_platform_private.h
index 500e299..dd1beda 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -32,6 +32,8 @@ struct vfio_platform_irq {
struct eventfd_ctx *trigger;
bool masked;
spinlock_t lock;
+ struct virqfd *unmask;
+ struct virqfd *mask;
};
struct vfio_platform_region {
--
1.8.3.2
--
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