[PATCH v12 07/13] vfio: Use capability chains to handle device specific irq
From: Eric Auger <eric.auger@redhat.com>
Date: 2021-02-23 21:15:07
Also in:
kvmarm, linux-iommu, lkml
Subsystem:
the rest, vfio driver · Maintainers:
Linus Torvalds, Alex Williamson
From: Tina Zhang <redacted> Caps the number of irqs with fixed indexes and uses capability chains to chain device specific irqs. Signed-off-by: Tina Zhang <redacted> Signed-off-by: Eric Auger <eric.auger@redhat.com> [Eric: Put cap_offset at the end of the vfio_irq_info struct, remove GFX IRQ at the moment and remove any reference to this latter in the commit message] --- --- include/uapi/linux/vfio.h | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index bc46e5d6daa4..3688215843fe 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h@@ -702,11 +702,27 @@ struct vfio_irq_info { #define VFIO_IRQ_INFO_MASKABLE (1 << 1) #define VFIO_IRQ_INFO_AUTOMASKED (1 << 2) #define VFIO_IRQ_INFO_NORESIZE (1 << 3) +#define VFIO_IRQ_INFO_FLAG_CAPS (1 << 4) /* Info supports caps */ __u32 index; /* IRQ index */ __u32 count; /* Number of IRQs within this index */ + __u32 cap_offset; /* Offset within info struct of first cap */ }; #define VFIO_DEVICE_GET_IRQ_INFO _IO(VFIO_TYPE, VFIO_BASE + 9) +/* + * The irq type capability allows IRQs unique to a specific device or + * class of devices to be exposed. + * + * The structures below define version 1 of this capability. + */ +#define VFIO_IRQ_INFO_CAP_TYPE 3 + +struct vfio_irq_info_cap_type { + struct vfio_info_cap_header header; + __u32 type; /* global per bus driver */ + __u32 subtype; /* type specific */ +}; + /** * VFIO_DEVICE_SET_IRQS - _IOW(VFIO_TYPE, VFIO_BASE + 10, struct vfio_irq_set) *
@@ -808,7 +824,8 @@ enum { VFIO_PCI_MSIX_IRQ_INDEX, VFIO_PCI_ERR_IRQ_INDEX, VFIO_PCI_REQ_IRQ_INDEX, - VFIO_PCI_NUM_IRQS + VFIO_PCI_NUM_IRQS = 5 /* Fixed user ABI, IRQ indexes >=5 use */ + /* device specific cap to define content */ }; /*
--
2.26.2