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authorAntonios Motakis <a.motakis@virtualopensystems.com>2015-03-16 23:08:55 +0300
committerAlex Williamson <alex.williamson@redhat.com>2015-03-16 23:08:55 +0300
commita7fa7c77cf15fb22d0f33fcc88770de0246c5588 (patch)
tree36d38f48496c5f67f73bbbe15d30a7cf11a99b51 /drivers/vfio
parent42ac9bd18d4fc28c36c7927847f0f6e90ecd7710 (diff)
downloadlinux-a7fa7c77cf15fb22d0f33fcc88770de0246c5588.tar.xz
vfio/platform: implement IRQ masking/unmasking via an eventfd
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.motakis@virtualopensystems.com> Signed-off-by: Baptiste Reynal <b.reynal@virtualopensystems.com> Reviewed-by: Eric Auger <eric.auger@linaro.org> Tested-by: Eric Auger <eric.auger@linaro.org> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio')
-rw-r--r--drivers/vfio/platform/vfio_platform_irq.c47
-rw-r--r--drivers/vfio/platform/vfio_platform_private.h2
2 files changed, 45 insertions, 4 deletions
diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
index e0e638841d0b..88bba57b30a8 100644
--- a/drivers/vfio/platform/vfio_platform_irq.c
+++ b/drivers/vfio/platform/vfio_platform_irq.c
@@ -37,6 +37,15 @@ 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,
@@ -48,8 +57,18 @@ static int vfio_platform_set_irq_mask(struct vfio_platform_device *vdev,
if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
return -EINVAL;
- if (flags & VFIO_IRQ_SET_DATA_EVENTFD)
- return -EINVAL; /* not implemented yet */
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_mask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].mask, fd);
+
+ vfio_virqfd_disable(&vdev->irqs[index].mask);
+ return 0;
+ }
if (flags & VFIO_IRQ_SET_DATA_NONE) {
vfio_platform_mask(&vdev->irqs[index]);
@@ -78,6 +97,15 @@ 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,
@@ -89,8 +117,19 @@ static int vfio_platform_set_irq_unmask(struct vfio_platform_device *vdev,
if (!(vdev->irqs[index].flags & VFIO_IRQ_INFO_MASKABLE))
return -EINVAL;
- if (flags & VFIO_IRQ_SET_DATA_EVENTFD)
- return -EINVAL; /* not implemented yet */
+ if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
+ int32_t fd = *(int32_t *)data;
+
+ if (fd >= 0)
+ return vfio_virqfd_enable((void *) &vdev->irqs[index],
+ vfio_platform_unmask_handler,
+ NULL, NULL,
+ &vdev->irqs[index].unmask,
+ fd);
+
+ vfio_virqfd_disable(&vdev->irqs[index].unmask);
+ return 0;
+ }
if (flags & VFIO_IRQ_SET_DATA_NONE) {
vfio_platform_unmask(&vdev->irqs[index]);
diff --git a/drivers/vfio/platform/vfio_platform_private.h b/drivers/vfio/platform/vfio_platform_private.h
index ff2db1d20a26..5d31e0473406 100644
--- a/drivers/vfio/platform/vfio_platform_private.h
+++ b/drivers/vfio/platform/vfio_platform_private.h
@@ -35,6 +35,8 @@ struct vfio_platform_irq {
struct eventfd_ctx *trigger;
bool masked;
spinlock_t lock;
+ struct virqfd *unmask;
+ struct virqfd *mask;
};
struct vfio_platform_region {