[PATCH v2 3/5] vfio-pci/zdev: define the vfio_zdev header

Matthew Rosato
2020-10-02T20:01:16Z

We define a new device region in vfio.h to be able to get the ZPCI CLP
information by reading this region from userspace.

We create a new file, vfio_zdev.h to define the structure of the new
region defined in vfio.h

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
include/uapi/linux/vfio.h | 5 ++
include/uapi/linux/vfio_zdev.h | 118 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 123 insertions(+)
create mode 100644 include/uapi/linux/vfio_zdev.h

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 9204705..65eb367 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -326,6 +326,11 @@ struct vfio_region_info_cap_type {
* to do TLB invalidation on a GPU.
*/
#define VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD (1)
+/*
+ * IBM zPCI specific hardware feature information for a devcie. The contents
+ * of this region are mapped by struct vfio_region_zpci_info.
+ */
+#define VFIO_REGION_SUBTYPE_IBM_ZPCI_CLP (2)

/* sub-types for VFIO_REGION_TYPE_GFX */
#define VFIO_REGION_SUBTYPE_GFX_EDID (1)
diff --git a/include/uapi/linux/vfio_zdev.h b/include/uapi/linux/vfio_zdev.h
new file mode 100644
index 0000000..1c8fb62
--- /dev/null
+++ b/include/uapi/linux/vfio_zdev.h
@@ -0,0 +1,118 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Region definition for ZPCI devices
+ *
+ * Copyright IBM Corp. 2020
+ *
+ * Author(s): Pierre Morel <pmorel@linux.ibm.com>
+ * Matthew Rosato <mjrosato@linux.ibm.com>
+ */
+
+#ifndef _VFIO_ZDEV_H_
+#define _VFIO_ZDEV_H_
+
+#include <linux/types.h>
+
+/**
+ * struct vfio_region_zpci_info - ZPCI information
+ *
+ * This region provides zPCI specific hardware feature information for a
+ * device.
+ *
+ * The ZPCI information structure is presented as a chain of CLP features
+ * defined below. argsz provides the size of the entire region, and offset
+ * provides the location of the first CLP feature in the chain.
+ *
+ */
+struct vfio_region_zpci_info {
+ __u32 argsz; /* Size of entire payload */
+ __u32 offset; /* Location of first entry */
+};
+
+/**
+ * struct vfio_region_zpci_info_hdr - ZPCI header information
+ *
+ * This structure is included at the top of each CLP feature to define what
+ * type of CLP feature is presented / the structure version. The next value
+ * defines the offset of the next CLP feature, and is an offset from the very
+ * beginning of the region (vfio_region_zpci_info).
+ *
+ * Each CLP feature must have it's own unique 'id'.
+ */
+struct vfio_region_zpci_info_hdr {
+ __u16 id; /* Identifies the CLP type */
+ __u16 version; /* version of the CLP data */
+ __u32 next; /* Offset of next entry */
+};
+
+/**
+ * struct vfio_region_zpci_info_pci - Base PCI Function information
+ *
+ * This region provides a set of descriptive information about the associated
+ * PCI function.
+ */
+#define VFIO_REGION_ZPCI_INFO_BASE 1
+
+struct vfio_region_zpci_info_base {
+ struct vfio_region_zpci_info_hdr hdr;
+ __u64 start_dma; /* Start of available DMA addresses */
+ __u64 end_dma; /* End of available DMA addresses */
+ __u16 pchid; /* Physical Channel ID */
+ __u16 vfn; /* Virtual function number */
+ __u16 fmb_length; /* Measurement Block Length (in bytes) */
+ __u8 pft; /* PCI Function Type */
+ __u8 gid; /* PCI function group ID */
+};
+
+
+/**
+ * struct vfio_region_zpci_info_group - Base PCI Function Group information
+ *
+ * This region provides a set of descriptive information about the group of PCI
+ * functions that the associated device belongs to.
+ */
+#define VFIO_REGION_ZPCI_INFO_GROUP 2
+
+struct vfio_region_zpci_info_group {
+ struct vfio_region_zpci_info_hdr hdr;
+ __u64 dasm; /* DMA Address space mask */
+ __u64 msi_addr; /* MSI address */
+ __u64 flags;
+#define VFIO_PCI_ZDEV_FLAGS_REFRESH 1 /* Use program-specified TLB refresh */
+ __u16 mui; /* Measurement Block Update Interval */
+ __u16 noi; /* Maximum number of MSIs */
+ __u16 maxstbl; /* Maximum Store Block Length */
+ __u8 version; /* Supported PCI Version */
+};
+
+/**
+ * struct vfio_region_zpci_info_util - Utility String
+ *
+ * This region provides the utility string for the associated device, which is
+ * a device identifier string made up of EBCDID characters. 'size' specifies
+ * the length of 'util_str'.
+ */
+#define VFIO_REGION_ZPCI_INFO_UTIL 3
+
+struct vfio_region_zpci_info_util {
+ struct vfio_region_zpci_info_hdr hdr;
+ __u32 size;
+ __u8 util_str[];
+};
+
+/**
+ * struct vfio_region_zpci_info_pfip - PCI Function Path
+ *
+ * This region provides the PCI function path string, which is an identifier
+ * that describes the internal hardware path of the device. 'size' specifies
+ * the length of 'pfip'.
+ */
+#define VFIO_REGION_ZPCI_INFO_PFIP 4
+
+struct vfio_region_zpci_info_pfip {
+struct vfio_region_zpci_info_hdr hdr;
+ __u32 size;
+ __u8 pfip[];
+};
+
+#endif
--
1.8.3.1