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vfio/pci-core: Add capability for AtomicOp completer support

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Test and enable PCIe AtomicOp completer support of various widths and
report via device-info capability to userspace.

Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Robin Voetter <robin@streamhpc.com>
Tested-by: Robin Voetter <robin@streamhpc.com>
Link: https://lore.kernel.org/r/20230519214748.402003-1-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2023-05-19 15:47:48 -06:00
parent d9824f70e5
commit a5bfe22db2
2 changed files with 52 additions and 0 deletions
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14
include/uapi/linux/vfio.h
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@ -240,6 +240,20 @@ struct vfio_device_info {
#define VFIO_DEVICE_INFO_CAP_ZPCI_UTIL 3
#define VFIO_DEVICE_INFO_CAP_ZPCI_PFIP 4
/*
* The following VFIO_DEVICE_INFO capability reports support for PCIe AtomicOp
* completion to the root bus with supported widths provided via flags.
*/
#define VFIO_DEVICE_INFO_CAP_PCI_ATOMIC_COMP 5
struct vfio_device_info_cap_pci_atomic_comp {
struct vfio_info_cap_header header;
__u32 flags;
#define VFIO_PCI_ATOMIC_COMP32 (1 << 0)
#define VFIO_PCI_ATOMIC_COMP64 (1 << 1)
#define VFIO_PCI_ATOMIC_COMP128 (1 << 2)
__u32 reserved;
};
/**
* VFIO_DEVICE_GET_REGION_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 8,
* struct vfio_region_info)