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Subject[PATCH v2 2/4] vfio: vfio_iommu_type1: Define VFIO_IOMMU_INFO_CAPABILITIES
Date
We add a capabilities functionality to VFIO_IOMMU_GET_INFO.

This will allow the VFIO_IOMMU_GET_INFO ioctl to retrieve IOMMU
specific information.

we define a new flag VFIO_IOMMU_INFO_CAPABILITIES in the
vfio_iommu_type1_info structure and two Z-PCI specific
capabilities:
VFIO_IOMMU_INFO_CAP_QFN: to query Z-PCI function information
VFIO_IOMMU_INFO_CAP_QGRP: to query for Z-PCI group information
and we define the associated information structures.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---
include/uapi/linux/vfio.h | 67 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 8f10748..aed0e72 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -715,6 +715,73 @@ struct vfio_iommu_type1_info {
__u32 flags;
#define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */
__u64 iova_pgsizes; /* Bitmap of supported page sizes */
+#define VFIO_IOMMU_INFO_CAPABILITIES (1 << 1) /* support capabilities info */
+ __u64 cap_offset; /* Offset within info struct of first cap */
+};
+
+/*
+ * The VFIO IOMMU INFO PCI function capability allows to retrieve
+ * Z-PCI function specific data needed by the VFIO user to provide
+ * them to the guest function's driver.
+ *
+ * The structures below define version 1 of this capability.
+ */
+#define VFIO_IOMMU_INFO_CAP_QFN 1
+
+struct vfio_iommu_pci_function {
+ __u32 ignored;
+ __u32 format; /* Structure format */
+ __u64 reserved1;
+ __u16 vfn; /* Virtual function number */
+ __u8 u; /* utility string presence */
+ __u8 gid; /* Function group */
+ __u32 fid; /* Function identifier */
+ __u8 bar_size[6]; /* Bar size */
+ __u16 pchid; /* Physical channel ID */
+ __u32 bar[6]; /* PCI Bar address */
+ __u64 reserved2;
+ __u64 sdma; /* Start available DMA */
+ __u64 edma; /* End available DMA */
+ __u32 reserved3[11];
+ __u32 uid; /* User's identifier */
+ __u8 util_str[64]; /* Adapter specific utility string */
+};
+
+struct vfio_iommu_type1_info_pcifn {
+ struct vfio_info_cap_header header;
+ struct vfio_iommu_pci_function response;
+};
+
+/*
+ * The VFIO IOMMU INFO PCI function group capability allows to retrieve
+ * information, specific to a group of Z-PCI functions, needed by
+ * the VFIO user to provide them to the guest function's driver.
+ *
+ * The structures below define version 1 of this capability.
+ */
+#define VFIO_IOMMU_INFO_CAP_QGRP 2
+
+struct vfio_iommu_pci_function_group {
+ __u32 ignored;
+ __u32 format; /* Structure format */
+ __u64 reserved1;
+ __u16 noi; /* Maximum number of interruptions */
+ __u8 version; /* Version */
+ __u8 flags; /* Flags */
+#define VFIO_IOMMU_ZPCI_REFRESH 0x01
+#define VFIO_IOMMU_ZPCI_FRAME 0x02
+ __u16 maxstbl; /* Maximum store-block length */
+ __u16 mui; /* Measurement block update interval */
+ __u64 reserved3;
+ __u64 dasm; /* DMA Address space mask */
+ __u64 msia; /* MSI Address */
+ __u64 reserved4;
+ __u64 reserved5;
+};
+
+struct vfio_iommu_type1_info_pcifg {
+ struct vfio_info_cap_header header;
+ struct vfio_iommu_pci_function_group response;
};

#define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
--
2.7.4
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