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rust: pci: provide access to PCI Class and Class-related items 

Allow callers to write Class::STORAGE_SCSI instead of
bindings::PCI_CLASS_STORAGE_SCSI, for example.

New APIs:
    Class::STORAGE_SCSI, Class::NETWORK_ETHERNET, etc.
    Class::from_raw() -- Only callable from pci module.
    Class::as_raw()
    ClassMask: Full, ClassSubclass
    Device::pci_class()

Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Elle Rhumsaa <elle@weathered-steel.dev>
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Link: https://lore.kernel.org/r/20250829223632.144030-2-jhubbard@nvidia.com
[ Minor doc-comment improvements, align Debug and Display. - Danilo ]
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
John Hubbard 2025-08-29 15:36:27 -07:00 committed by Danilo Krummrich
parent b71763a0a3
commit ed78a01887
3 changed files with 248 additions and 0 deletions
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1
MAINTAINERS
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@ -19575,6 +19575,7 @@ C: irc://irc.oftc.net/linux-pci
T: git git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git
F: rust/helpers/pci.c
F: rust/kernel/pci.rs
F: rust/kernel/pci/
F: samples/rust/rust_driver_pci.rs
PCIE BANDWIDTH CONTROLLER

11
rust/kernel/pci.rs
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@ -24,6 +24,10 @@
};
use kernel::prelude::*;
mod id;
pub use self::id::{Class, ClassMask};
/// An adapter for the registration of PCI drivers.
pub struct Adapter<T: Driver>(T);
@ -459,6 +463,13 @@ pub fn resource_len(&self, bar: u32) -> Result<bindings::resource_size_t> {
// - by its type invariant `self.as_raw` is always a valid pointer to a `struct pci_dev`.
Ok(unsafe { bindings::pci_resource_len(self.as_raw(), bar.try_into()?) })
}
/// Returns the PCI class as a `Class` struct.
#[inline]
pub fn pci_class(&self) -> Class {
// SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`.
Class::from_raw(unsafe { (*self.as_raw()).class })
}
}
impl Device<device::Bound> {

236
rust/kernel/pci/id.rs Normal file
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@ -0,0 +1,236 @@
// SPDX-License-Identifier: GPL-2.0
//! PCI device identifiers and related types.
//!
//! This module contains PCI class codes and supporting types.
use crate::{bindings, error::code::EINVAL, error::Error, prelude::*};
use core::fmt;
/// PCI device class codes.
///
/// Each entry contains the full 24-bit PCI class code (base class in bits
/// 23-16, subclass in bits 15-8, programming interface in bits 7-0).
///
/// # Examples
///
/// ```
/// # use kernel::{device::Core, pci::{self, Class}, prelude::*};
/// fn probe_device(pdev: &pci::Device<Core>) -> Result {
/// let pci_class = pdev.pci_class();
/// dev_info!(
/// pdev.as_ref(),
/// "Detected PCI class: {}\n",
/// pci_class
/// );
/// Ok(())
/// }
/// ```
#[derive(Clone, Copy, PartialEq, Eq)]
#[repr(transparent)]
pub struct Class(u32);
/// PCI class mask constants for matching [`Class`] codes.
#[repr(u32)]
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ClassMask {
/// Match the full 24-bit class code.
Full = 0xffffff,
/// Match the upper 16 bits of the class code (base class and subclass only)
ClassSubclass = 0xffff00,
}
macro_rules! define_all_pci_classes {
(
$($variant:ident = $binding:expr,)+
) => {
impl Class {
$(
#[allow(missing_docs)]
pub const $variant: Self = Self(Self::to_24bit_class($binding));
)+
}
};
}
/// Once constructed, a [`Class`] contains a valid PCI class code.
impl Class {
/// Create a [`Class`] from a raw 24-bit class code.
#[inline]
pub(super) fn from_raw(class_code: u32) -> Self {
Self(class_code)
}
/// Get the raw 24-bit class code value.
#[inline]
pub const fn as_raw(self) -> u32 {
self.0
}
// Converts a PCI class constant to 24-bit format.
//
// Many device drivers use only the upper 16 bits (base class and subclass),
// but some use the full 24 bits. In order to support both cases, store the
// class code as a 24-bit value, where 16-bit values are shifted up 8 bits.
const fn to_24bit_class(val: u32) -> u32 {
if val > 0xFFFF {
val
} else {
val << 8
}
}
}
impl fmt::Debug for Class {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "0x{:06x}", self.0)
}
}
impl fmt::Display for Class {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
<Self as fmt::Debug>::fmt(self, f)
}
}
impl ClassMask {
/// Get the raw mask value.
#[inline]
pub const fn as_raw(self) -> u32 {
self as u32
}
}
impl TryFrom<u32> for ClassMask {
type Error = Error;
fn try_from(value: u32) -> Result<Self, Self::Error> {
match value {
0xffffff => Ok(ClassMask::Full),
0xffff00 => Ok(ClassMask::ClassSubclass),
_ => Err(EINVAL),
}
}
}
define_all_pci_classes! {
NOT_DEFINED = bindings::PCI_CLASS_NOT_DEFINED, // 0x000000
NOT_DEFINED_VGA = bindings::PCI_CLASS_NOT_DEFINED_VGA, // 0x000100
STORAGE_SCSI = bindings::PCI_CLASS_STORAGE_SCSI, // 0x010000
STORAGE_IDE = bindings::PCI_CLASS_STORAGE_IDE, // 0x010100
STORAGE_FLOPPY = bindings::PCI_CLASS_STORAGE_FLOPPY, // 0x010200
STORAGE_IPI = bindings::PCI_CLASS_STORAGE_IPI, // 0x010300
STORAGE_RAID = bindings::PCI_CLASS_STORAGE_RAID, // 0x010400
STORAGE_SATA = bindings::PCI_CLASS_STORAGE_SATA, // 0x010600
STORAGE_SATA_AHCI = bindings::PCI_CLASS_STORAGE_SATA_AHCI, // 0x010601
STORAGE_SAS = bindings::PCI_CLASS_STORAGE_SAS, // 0x010700
STORAGE_EXPRESS = bindings::PCI_CLASS_STORAGE_EXPRESS, // 0x010802
STORAGE_OTHER = bindings::PCI_CLASS_STORAGE_OTHER, // 0x018000
NETWORK_ETHERNET = bindings::PCI_CLASS_NETWORK_ETHERNET, // 0x020000
NETWORK_TOKEN_RING = bindings::PCI_CLASS_NETWORK_TOKEN_RING, // 0x020100
NETWORK_FDDI = bindings::PCI_CLASS_NETWORK_FDDI, // 0x020200
NETWORK_ATM = bindings::PCI_CLASS_NETWORK_ATM, // 0x020300
NETWORK_OTHER = bindings::PCI_CLASS_NETWORK_OTHER, // 0x028000
DISPLAY_VGA = bindings::PCI_CLASS_DISPLAY_VGA, // 0x030000
DISPLAY_XGA = bindings::PCI_CLASS_DISPLAY_XGA, // 0x030100
DISPLAY_3D = bindings::PCI_CLASS_DISPLAY_3D, // 0x030200
DISPLAY_OTHER = bindings::PCI_CLASS_DISPLAY_OTHER, // 0x038000
MULTIMEDIA_VIDEO = bindings::PCI_CLASS_MULTIMEDIA_VIDEO, // 0x040000
MULTIMEDIA_AUDIO = bindings::PCI_CLASS_MULTIMEDIA_AUDIO, // 0x040100
MULTIMEDIA_PHONE = bindings::PCI_CLASS_MULTIMEDIA_PHONE, // 0x040200
MULTIMEDIA_HD_AUDIO = bindings::PCI_CLASS_MULTIMEDIA_HD_AUDIO, // 0x040300
MULTIMEDIA_OTHER = bindings::PCI_CLASS_MULTIMEDIA_OTHER, // 0x048000
MEMORY_RAM = bindings::PCI_CLASS_MEMORY_RAM, // 0x050000
MEMORY_FLASH = bindings::PCI_CLASS_MEMORY_FLASH, // 0x050100
MEMORY_CXL = bindings::PCI_CLASS_MEMORY_CXL, // 0x050200
MEMORY_OTHER = bindings::PCI_CLASS_MEMORY_OTHER, // 0x058000
BRIDGE_HOST = bindings::PCI_CLASS_BRIDGE_HOST, // 0x060000
BRIDGE_ISA = bindings::PCI_CLASS_BRIDGE_ISA, // 0x060100
BRIDGE_EISA = bindings::PCI_CLASS_BRIDGE_EISA, // 0x060200
BRIDGE_MC = bindings::PCI_CLASS_BRIDGE_MC, // 0x060300
BRIDGE_PCI_NORMAL = bindings::PCI_CLASS_BRIDGE_PCI_NORMAL, // 0x060400
BRIDGE_PCI_SUBTRACTIVE = bindings::PCI_CLASS_BRIDGE_PCI_SUBTRACTIVE, // 0x060401
BRIDGE_PCMCIA = bindings::PCI_CLASS_BRIDGE_PCMCIA, // 0x060500
BRIDGE_NUBUS = bindings::PCI_CLASS_BRIDGE_NUBUS, // 0x060600
BRIDGE_CARDBUS = bindings::PCI_CLASS_BRIDGE_CARDBUS, // 0x060700
BRIDGE_RACEWAY = bindings::PCI_CLASS_BRIDGE_RACEWAY, // 0x060800
BRIDGE_OTHER = bindings::PCI_CLASS_BRIDGE_OTHER, // 0x068000
COMMUNICATION_SERIAL = bindings::PCI_CLASS_COMMUNICATION_SERIAL, // 0x070000
COMMUNICATION_PARALLEL = bindings::PCI_CLASS_COMMUNICATION_PARALLEL, // 0x070100
COMMUNICATION_MULTISERIAL = bindings::PCI_CLASS_COMMUNICATION_MULTISERIAL, // 0x070200
COMMUNICATION_MODEM = bindings::PCI_CLASS_COMMUNICATION_MODEM, // 0x070300
COMMUNICATION_OTHER = bindings::PCI_CLASS_COMMUNICATION_OTHER, // 0x078000
SYSTEM_PIC = bindings::PCI_CLASS_SYSTEM_PIC, // 0x080000
SYSTEM_PIC_IOAPIC = bindings::PCI_CLASS_SYSTEM_PIC_IOAPIC, // 0x080010
SYSTEM_PIC_IOXAPIC = bindings::PCI_CLASS_SYSTEM_PIC_IOXAPIC, // 0x080020
SYSTEM_DMA = bindings::PCI_CLASS_SYSTEM_DMA, // 0x080100
SYSTEM_TIMER = bindings::PCI_CLASS_SYSTEM_TIMER, // 0x080200
SYSTEM_RTC = bindings::PCI_CLASS_SYSTEM_RTC, // 0x080300
SYSTEM_PCI_HOTPLUG = bindings::PCI_CLASS_SYSTEM_PCI_HOTPLUG, // 0x080400
SYSTEM_SDHCI = bindings::PCI_CLASS_SYSTEM_SDHCI, // 0x080500
SYSTEM_RCEC = bindings::PCI_CLASS_SYSTEM_RCEC, // 0x080700
SYSTEM_OTHER = bindings::PCI_CLASS_SYSTEM_OTHER, // 0x088000
INPUT_KEYBOARD = bindings::PCI_CLASS_INPUT_KEYBOARD, // 0x090000
INPUT_PEN = bindings::PCI_CLASS_INPUT_PEN, // 0x090100
INPUT_MOUSE = bindings::PCI_CLASS_INPUT_MOUSE, // 0x090200
INPUT_SCANNER = bindings::PCI_CLASS_INPUT_SCANNER, // 0x090300
INPUT_GAMEPORT = bindings::PCI_CLASS_INPUT_GAMEPORT, // 0x090400
INPUT_OTHER = bindings::PCI_CLASS_INPUT_OTHER, // 0x098000
DOCKING_GENERIC = bindings::PCI_CLASS_DOCKING_GENERIC, // 0x0a0000
DOCKING_OTHER = bindings::PCI_CLASS_DOCKING_OTHER, // 0x0a8000
PROCESSOR_386 = bindings::PCI_CLASS_PROCESSOR_386, // 0x0b0000
PROCESSOR_486 = bindings::PCI_CLASS_PROCESSOR_486, // 0x0b0100
PROCESSOR_PENTIUM = bindings::PCI_CLASS_PROCESSOR_PENTIUM, // 0x0b0200
PROCESSOR_ALPHA = bindings::PCI_CLASS_PROCESSOR_ALPHA, // 0x0b1000
PROCESSOR_POWERPC = bindings::PCI_CLASS_PROCESSOR_POWERPC, // 0x0b2000
PROCESSOR_MIPS = bindings::PCI_CLASS_PROCESSOR_MIPS, // 0x0b3000
PROCESSOR_CO = bindings::PCI_CLASS_PROCESSOR_CO, // 0x0b4000
SERIAL_FIREWIRE = bindings::PCI_CLASS_SERIAL_FIREWIRE, // 0x0c0000
SERIAL_FIREWIRE_OHCI = bindings::PCI_CLASS_SERIAL_FIREWIRE_OHCI, // 0x0c0010
SERIAL_ACCESS = bindings::PCI_CLASS_SERIAL_ACCESS, // 0x0c0100
SERIAL_SSA = bindings::PCI_CLASS_SERIAL_SSA, // 0x0c0200
SERIAL_USB_UHCI = bindings::PCI_CLASS_SERIAL_USB_UHCI, // 0x0c0300
SERIAL_USB_OHCI = bindings::PCI_CLASS_SERIAL_USB_OHCI, // 0x0c0310
SERIAL_USB_EHCI = bindings::PCI_CLASS_SERIAL_USB_EHCI, // 0x0c0320
SERIAL_USB_XHCI = bindings::PCI_CLASS_SERIAL_USB_XHCI, // 0x0c0330
SERIAL_USB_CDNS = bindings::PCI_CLASS_SERIAL_USB_CDNS, // 0x0c0380
SERIAL_USB_DEVICE = bindings::PCI_CLASS_SERIAL_USB_DEVICE, // 0x0c03fe
SERIAL_FIBER = bindings::PCI_CLASS_SERIAL_FIBER, // 0x0c0400
SERIAL_SMBUS = bindings::PCI_CLASS_SERIAL_SMBUS, // 0x0c0500
SERIAL_IPMI_SMIC = bindings::PCI_CLASS_SERIAL_IPMI_SMIC, // 0x0c0700
SERIAL_IPMI_KCS = bindings::PCI_CLASS_SERIAL_IPMI_KCS, // 0x0c0701
SERIAL_IPMI_BT = bindings::PCI_CLASS_SERIAL_IPMI_BT, // 0x0c0702
WIRELESS_RF_CONTROLLER = bindings::PCI_CLASS_WIRELESS_RF_CONTROLLER, // 0x0d1000
WIRELESS_WHCI = bindings::PCI_CLASS_WIRELESS_WHCI, // 0x0d1010
INTELLIGENT_I2O = bindings::PCI_CLASS_INTELLIGENT_I2O, // 0x0e0000
SATELLITE_TV = bindings::PCI_CLASS_SATELLITE_TV, // 0x0f0000
SATELLITE_AUDIO = bindings::PCI_CLASS_SATELLITE_AUDIO, // 0x0f0100
SATELLITE_VOICE = bindings::PCI_CLASS_SATELLITE_VOICE, // 0x0f0300
SATELLITE_DATA = bindings::PCI_CLASS_SATELLITE_DATA, // 0x0f0400
CRYPT_NETWORK = bindings::PCI_CLASS_CRYPT_NETWORK, // 0x100000
CRYPT_ENTERTAINMENT = bindings::PCI_CLASS_CRYPT_ENTERTAINMENT, // 0x100100
CRYPT_OTHER = bindings::PCI_CLASS_CRYPT_OTHER, // 0x108000
SP_DPIO = bindings::PCI_CLASS_SP_DPIO, // 0x110000
SP_OTHER = bindings::PCI_CLASS_SP_OTHER, // 0x118000
ACCELERATOR_PROCESSING = bindings::PCI_CLASS_ACCELERATOR_PROCESSING, // 0x120000
OTHERS = bindings::PCI_CLASS_OTHERS, // 0xff0000
}