On Tue, 04 May 2021 09:52:02 -0600
Alex Williamson <alex.william...@redhat.com> wrote:
> Revert the uAPI changes from the below commit with notice that these
> regions and capabilities are no longer provided.
>
> Fixes: b392a1989170 ("vfio/pci: remove vfio_pci_nvlink2")
> Reported-by: Greg Kurz <gr...@kaod.org>
> Signed-off-by: Alex Williamson <alex.william...@redhat.com>
> ---
>
> Greg (Kurz), please double check this resolves the issue. Thanks!
>
It does. Feel free to add:
Reviewed-by: Greg Kurz <gr...@kaod.org>
and
Tested-by: Greg Kurz <gr...@kaod.org>
Thanks for the quick fix.
Cheers,
--
Greg
> include/uapi/linux/vfio.h | 46
> +++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 42 insertions(+), 4 deletions(-)
>
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 34b1f53a3901..ef33ea002b0b 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -333,10 +333,21 @@ struct vfio_region_info_cap_type {
> #define VFIO_REGION_SUBTYPE_INTEL_IGD_LPC_CFG (3)
>
> /* 10de vendor PCI sub-types */
> -/* subtype 1 was VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM, don't use */
> +/*
> + * NVIDIA GPU NVlink2 RAM is coherent RAM mapped onto the host address space.
> + *
> + * Deprecated, region no longer provided
> + */
> +#define VFIO_REGION_SUBTYPE_NVIDIA_NVLINK2_RAM (1)
>
> /* 1014 vendor PCI sub-types */
> -/* subtype 1 was VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD, don't use */
> +/*
> + * IBM NPU NVlink2 ATSD (Address Translation Shootdown) register of NPU
> + * to do TLB invalidation on a GPU.
> + *
> + * Deprecated, region no longer provided
> + */
> +#define VFIO_REGION_SUBTYPE_IBM_NVLINK2_ATSD (1)
>
> /* sub-types for VFIO_REGION_TYPE_GFX */
> #define VFIO_REGION_SUBTYPE_GFX_EDID (1)
> @@ -630,9 +641,36 @@ struct vfio_device_migration_info {
> */
> #define VFIO_REGION_INFO_CAP_MSIX_MAPPABLE 3
>
> -/* subtype 4 was VFIO_REGION_INFO_CAP_NVLINK2_SSATGT, don't use */
> +/*
> + * Capability with compressed real address (aka SSA - small system address)
> + * where GPU RAM is mapped on a system bus. Used by a GPU for DMA routing
> + * and by the userspace to associate a NVLink bridge with a GPU.
> + *
> + * Deprecated, capability no longer provided
> + */
> +#define VFIO_REGION_INFO_CAP_NVLINK2_SSATGT 4
> +
> +struct vfio_region_info_cap_nvlink2_ssatgt {
> + struct vfio_info_cap_header header;
> + __u64 tgt;
> +};
>
> -/* subtype 5 was VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD, don't use */
> +/*
> + * Capability with an NVLink link speed. The value is read by
> + * the NVlink2 bridge driver from the bridge's "ibm,nvlink-speed"
> + * property in the device tree. The value is fixed in the hardware
> + * and failing to provide the correct value results in the link
> + * not working with no indication from the driver why.
> + *
> + * Deprecated, capability no longer provided
> + */
> +#define VFIO_REGION_INFO_CAP_NVLINK2_LNKSPD 5
> +
> +struct vfio_region_info_cap_nvlink2_lnkspd {
> + struct vfio_info_cap_header header;
> + __u32 link_speed;
> + __u32 __pad;
> +};
>
> /**
> * VFIO_DEVICE_GET_IRQ_INFO - _IOWR(VFIO_TYPE, VFIO_BASE + 9,
>
>
