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// SPDX-License-Identifier: GPL-2.0
// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
//! MCTP/NVDM protocol types for NVIDIA GPU firmware communication.
//!
//! MCTP (Management Component Transport Protocol) carries NVDM (NVIDIA
//! Data Model) messages between the kernel driver and GPU firmware processors
//! such as FSP and GSP.
use kernel::{
bitfield,
pci::Vendor,
prelude::*, //
};
use crate::{
bounded_enum,
num, //
};
bounded_enum! {
/// NVDM message type identifiers carried over MCTP.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum NvdmType with TryFrom<Bounded<u32, 8>> {
/// PRC (Product Reconfiguration Control) message.
Prc = 0x13,
/// Chain of Trust boot message.
Cot = 0x14,
/// FSP command response.
FspResponse = 0x15,
}
}
bitfield! {
/// MCTP transport header for NVIDIA firmware messages.
pub(crate) struct MctpHeader(u32) {
/// Start-of-message bit.
31:31 som;
/// End-of-message bit.
30:30 eom;
/// Packet sequence number.
29:28 seq;
/// Source endpoint ID.
23:16 seid;
}
}
impl MctpHeader {
/// Builds a single-packet MCTP header (`SOM=1`, `EOM=1`, `SEQ=0`, `SEID=0`).
pub(crate) fn single_packet() -> Self {
Self::zeroed().with_som(true).with_eom(true)
}
/// Returns whether this is a complete single-packet message (`SOM=1` and `EOM=1`).
pub(crate) fn is_single_packet(self) -> bool {
self.som().into_bool() && self.eom().into_bool()
}
}
/// MCTP message type for PCI vendor-defined messages.
const MSG_TYPE_VENDOR_PCI: u8 = 0x7e;
bitfield! {
/// NVIDIA Vendor-Defined Message header over MCTP.
pub(crate) struct NvdmHeader(u32) {
/// NVDM message type.
31:24 nvdm_type ?=> NvdmType;
/// PCI vendor ID.
23:8 vendor_id;
/// MCTP vendor-defined message type.
6:0 msg_type;
}
}
impl NvdmHeader {
/// Builds an NVDM header for the given message type.
pub(crate) fn new(nvdm_type: NvdmType) -> Self {
Self::zeroed()
.with_const_msg_type::<{ num::u8_as_u32(MSG_TYPE_VENDOR_PCI) }>()
.with_vendor_id(Vendor::NVIDIA.as_raw())
.with_nvdm_type(nvdm_type)
}
/// Validates this header against the expected NVIDIA NVDM format and type.
pub(crate) fn validate(self, expected_type: NvdmType) -> bool {
u8::from(self.msg_type()) == MSG_TYPE_VENDOR_PCI
&& u16::from(self.vendor_id()) == Vendor::NVIDIA.as_raw()
&& matches!(self.nvdm_type(), Ok(nvdm_type) if nvdm_type == expected_type)
}
}
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