Hi Maxim,
Here is the link to the kernel VFIO patch you have asked earlier (v4).
https://lore.kernel.org/kvm/20250221224638.1836909-1-wathsala.vithan...@arm.com/T/#me73cf9b9c87da97d7d9461dfb97863b78ca1755b
Thanks
--wathsala
> -----Original Message-----
> From: Wathsala Vithanage <wathsala.vithan...@arm.com>
> Sent: Monday, June 2, 2025 5:38 PM
> To: Chenbo Xia <chen...@nvidia.com>; Nipun Gupta <nipun.gu...@amd.com>;
> Maxime Coquelin <maxime.coque...@redhat.com>
> Cc: dev@dpdk.org; nd <n...@arm.com>; Wathsala Wathawana Vithanage
> <wathsala.vithan...@arm.com>; Dhruv Tripathi <dhruv.tripa...@arm.com>
> Subject: [PATCH v5 1/4] pci: add non-merged Linux uAPI changes
>
> This commit is a hack to prevent build failures the next commit in this patch
> series
> causes due to missing vfio uapi definitions.
> This commit should NEVER BE MERGED.
> Next commit in this patch series depends on additions to vfio uapi that enable
> TPH icotl in the vfio-pci driver in the Linux kernel.
> These additions have not yet been merged into the upstream kernel.
>
> Signed-off-by: Wathsala Vithanage <wathsala.vithan...@arm.com>
> Reviewed-by: Dhruv Tripathi <dhruv.tripa...@arm.com>
> ---
> drivers/bus/pci/linux/pci_init.h | 1 +
> kernel/linux/uapi/linux/vfio_tph.h | 102 +++++++++++++++++++++++++++++
> 2 files changed, 103 insertions(+)
> create mode 100644 kernel/linux/uapi/linux/vfio_tph.h
>
> diff --git a/drivers/bus/pci/linux/pci_init.h
> b/drivers/bus/pci/linux/pci_init.h
> index a4d37c0d0a..25b901f460 100644
> --- a/drivers/bus/pci/linux/pci_init.h
> +++ b/drivers/bus/pci/linux/pci_init.h
> @@ -6,6 +6,7 @@
> #define EAL_PCI_INIT_H_
>
> #include <rte_vfio.h>
> +#include <uapi/linux/vfio_tph.h>
>
> #include "private.h"
>
> diff --git a/kernel/linux/uapi/linux/vfio_tph.h
> b/kernel/linux/uapi/linux/vfio_tph.h
> new file mode 100644
> index 0000000000..9336c2e5af
> --- /dev/null
> +++ b/kernel/linux/uapi/linux/vfio_tph.h
> @@ -0,0 +1,102 @@
> +
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +/*
> + * VFIO API definition
> + *
> + * WARNING: CONTENTS OF THIS HEADER NEEDS TO BE MERGED INTO
> KERNEL'S
> + * uapi/linux/vifo.h IN A FUTURE KERNEL RELEASE. UNTIL THEN IT'S TACKED
> + * ON TO DPDK'S kernel/linux/uapi DIRECTORY TO PREVENT BUILD FAILURES.
> + *
> + * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
> + * Author: Alex Williamson <alex.william...@redhat.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef _UAPIVFIO_TPH_H
> +#define _UAPIVFIO_TPH_H
> +
> +/**
> + * VFIO_DEVICE_PCI_TPH - _IO(VFIO_TYPE, VFIO_BASE + 22)
> + *
> + * This command is used to control PCIe TLP Processing Hints (TPH)
> + * capability in a PCIe device.
> + * It supports following operations on a PCIe device with respect to
> +TPH
> + * capability.
> + *
> + * - Enabling/disabling TPH capability in a PCIe device.
> + *
> + * Setting VFIO_DEVICE_TPH_ENABLE flag enables TPH in no-steering-tag,
> + * interrupt-vector, or device-specific mode defined in the PCIe
> specficiation
> + * when feature flags TPH_ST_NS_MODE, TPH_ST_IV_MODE, and
> TPH_ST_DS_MODE are
> + * set respectively. TPH_ST_xx_MODE macros are defined in
> + * uapi/linux/pci_regs.h.
> + *
> + * VFIO_DEVICE_TPH_DISABLE disables PCIe TPH on the device.
> + *
> + * - Writing STs to MSI-X or ST table in a PCIe device.
> + *
> + * VFIO_DEVICE_TPH_SET_ST flag set steering tags on a device at an index in
> + * MSI-X or ST-table depending on the VFIO_TPH_ST_x_MODE flag used and
> device
> + * capabilities. The caller can set one or more steering tags by passing an
> + * array of vfio_pci_tph_entry objects containing cpu_id, cache_level, and
> + * MSI-X/ST-table index. The caller can also set the intended memory type
> and
> + * the processing hint by setting VFIO_TPH_MEM_TYPE_x and
> VFIO_TPH_HINT_x
> + * flags, respectively.
> + *
> + * - Reading Steering Tags (ST) from the host platform.
> + *
> + * VFIO_DEVICE_TPH_GET_ST flags returns steering tags to the caller. Caller
> + * can request one or more steering tags by passing an array of
> + * vfio_pci_tph_entry objects. Steering Tag for each request is returned
> via
> + * the st field in vfio_pci_tph_entry.
> + */
> +struct vfio_pci_tph_entry {
> + /* in */
> + __u32 cpu_id; /* CPU logical ID */
> + __u32 cache_level; /* Cache level. L1 D= 0, L2D = 2, ...*/
> + __u8 flags;
> +#define VFIO_TPH_MEM_TYPE_MASK 0x1
> +#define VFIO_TPH_MEM_TYPE_SHIFT 0
> +#define VFIO_TPH_MEM_TYPE_VMEM 0 /* Request volatile memory
> ST */
> +#define VFIO_TPH_MEM_TYPE_PMEM 1 /* Request persistent
> memory ST */
> +
> +#define VFIO_TPH_HINT_MASK 0x3
> +#define VFIO_TPH_HINT_SHIFT 1
> +#define VFIO_TPH_HINT_BIDIR 0
> +#define VFIO_TPH_HINT_REQSTR (1 << VFIO_TPH_HINT_SHIFT)
> +#define VFIO_TPH_HINT_TARGET (2 << VFIO_TPH_HINT_SHIFT)
> +#define VFIO_TPH_HINT_TARGET_PRIO (3 << VFIO_TPH_HINT_SHIFT)
> + __u8 pad0;
> + __u16 index; /* MSI-X/ST-table index to set ST */
> + /* out */
> + __u16 st; /* Steering-Tag */
> + __u8 ph_ignore; /* Platform ignored the Processing */
> + __u8 pad1;
> +};
> +
> +struct vfio_pci_tph {
> + __u32 argsz; /* Size of vfio_pci_tph and info[] */
> + __u32 flags;
> +#define VFIO_TPH_ST_MODE_MASK 0x7
> +
> +#define VFIO_DEVICE_TPH_OP_SHIFT 3
> +#define VFIO_DEVICE_TPH_OP_MASK (0x7 <<
> VFIO_DEVICE_TPH_OP_SHIFT)
> +/* Enable TPH on device */
> +#define VFIO_DEVICE_TPH_ENABLE 0
> +/* Disable TPH on device */
> +#define VFIO_DEVICE_TPH_DISABLE (1 <<
> VFIO_DEVICE_TPH_OP_SHIFT)
> +/* Get steering-tags */
> +#define VFIO_DEVICE_TPH_GET_ST (2 <<
> VFIO_DEVICE_TPH_OP_SHIFT)
> +/* Set steering-tags */
> +#define VFIO_DEVICE_TPH_SET_ST (4 <<
> VFIO_DEVICE_TPH_OP_SHIFT)
> + __u32 count; /* Number of entries in ents[] */
> + struct vfio_pci_tph_entry ents[];
> +#define VFIO_TPH_INFO_MAX 2048 /* Max entries in ents[] */
> +};
> +
> +#define VFIO_DEVICE_PCI_TPH _IO(VFIO_TYPE, VFIO_BASE + 22)
> +
> +#endif /* _UAPIVFIO_TPH_H */
> --
> 2.43.0
