Merge tag 'drm-for-v4.16' of git://people.freedesktop.org/~airlied/linux

[linux-2.6-block.git] / include / uapi / linux / vfio.h

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 48c0661a826cd5df9e892d0f455556d5c73ac067..c74372163ed2640df882f0e45d695352df370cbb 100644 (file)
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -301,6 +301,16 @@ struct vfio_region_info_cap_type {
 #define VFIO_REGION_SUBTYPE_INTEL_IGD_HOST_CFG (2)
 #define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG  (3)
 
+/*
+ * The MSIX mappable capability informs that MSIX data of a BAR can be mmapped
+ * which allows direct access to non-MSIX registers which happened to be within
+ * the same system page.
+ *
+ * Even though the userspace gets direct access to the MSIX data, the existing
+ * VFIO_DEVICE_SET_IRQS interface must still be used for MSIX configuration.
+ */
+#define VFIO_REGION_INFO_CAP_MSIX_MAPPABLE     3
+
 /**
  * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9,
  *                                 struct vfio_irq_info)