RedBear-OS/audio/ihdad/src/main.rs

extern crate bitflags;
extern crate event;
extern crate spin;
extern crate syscall;

use libredox::flag;
use std::fs::File;
use std::io::{ErrorKind, Read, Write};
use std::os::unix::io::{AsRawFd, FromRawFd, RawFd};
use std::usize;
use syscall::{Packet, SchemeBlockMut};

use event::{user_data, EventQueue};
#[cfg(target_arch = "x86_64")]
use pcid_interface::irq_helpers::allocate_single_interrupt_vector_for_msi;
use pcid_interface::irq_helpers::read_bsp_apic_id;
use pcid_interface::{
    MsiSetFeatureInfo, PciFeature, PciFeatureInfo, PciFunctionHandle, SetFeatureInfo,
};

pub mod hda;

/*
VEND:PROD
Virtualbox   8086:2668
QEMU ICH9    8086:293E
82801H ICH8  8086:284B
*/

#[cfg(target_arch = "x86_64")]
fn get_int_method(pcid_handle: &mut PciFunctionHandle) -> File {
    let pci_config = pcid_handle.config();

    let all_pci_features = pcid_handle.fetch_all_features();
    log::debug!("PCI FEATURES: {:?}", all_pci_features);

    let has_msi = all_pci_features.iter().any(|feature| feature.is_msi());
    let has_msix = all_pci_features.iter().any(|feature| feature.is_msix());

    if has_msi && !has_msix {
        let capability = match pcid_handle.feature_info(PciFeature::Msi) {
            PciFeatureInfo::Msi(s) => s,
            PciFeatureInfo::MsiX(_) => panic!(),
        };
        // TODO: Allow allocation of up to 32 vectors.

        // TODO: Find a way to abstract this away, potantially as a helper module for
        // pcid_interface, so that this can be shared between nvmed, xhcid, ixgebd, etc..

        let destination_id = read_bsp_apic_id().expect("ihdad: failed to read BSP apic id");
        let (msg_addr_and_data, interrupt_handle) =
            allocate_single_interrupt_vector_for_msi(destination_id);

        let set_feature_info = MsiSetFeatureInfo {
            multi_message_enable: Some(0),
            message_address_and_data: Some(msg_addr_and_data),
            mask_bits: None,
        };
        pcid_handle.set_feature_info(SetFeatureInfo::Msi(set_feature_info));

        pcid_handle.enable_feature(PciFeature::Msi);
        log::debug!("Enabled MSI");

        interrupt_handle
    } else if let Some(irq) = pci_config.func.legacy_interrupt_line {
        log::debug!("Legacy IRQ {}", irq);

        // legacy INTx# interrupt pins.
        irq.irq_handle("ihdad")
    } else {
        panic!("ihdad: no interrupts supported at all")
    }
}

//TODO: MSI on non-x86_64?
#[cfg(not(target_arch = "x86_64"))]
fn get_int_method(pcid_handle: &mut PciFunctionHandle) -> File {
    let pci_config = pcid_handle.config();

    if let Some(irq) = pci_config.func.legacy_interrupt_line {
        // legacy INTx# interrupt pins.
        irq.irq_handle("ihdad")
    } else {
        panic!("ihdad: no interrupts supported at all")
    }
}

fn daemon(daemon: redox_daemon::Daemon) -> ! {
    common::setup_logging(
        "audio",
        "pcie",
        "ihda",
        log::LevelFilter::Info,
        log::LevelFilter::Info,
    );

    let mut pcid_handle = PciFunctionHandle::connect_default();

    let pci_config = pcid_handle.config();

    let mut name = pci_config.func.name();
    name.push_str("_ihda");

    log::info!(" + IHDA {}", pci_config.func.display());

    let address = unsafe { pcid_handle.map_bar(0) }.ptr.as_ptr() as usize;

    //TODO: MSI-X
    let mut irq_file = get_int_method(&mut pcid_handle);

    {
        let vend_prod: u32 = ((pci_config.func.full_device_id.vendor_id as u32) << 16)
            | (pci_config.func.full_device_id.device_id as u32);

        user_data! {
            enum Source {
                Irq,
                Scheme,
            }
        }

        let event_queue =
            EventQueue::<Source>::new().expect("ihdad: Could not create event queue.");
        let mut device = unsafe {
            hda::IntelHDA::new(address, vend_prod).expect("ihdad: failed to allocate device")
        };
        let socket_fd = libredox::call::open(
            ":audiohw",
            flag::O_RDWR | flag::O_CREAT | flag::O_NONBLOCK,
            0,
        )
        .expect("ihdad: failed to create hda scheme");
        let mut socket = unsafe { File::from_raw_fd(socket_fd as RawFd) };

        event_queue
            .subscribe(socket_fd, Source::Scheme, event::EventFlags::READ)
            .unwrap();
        event_queue
            .subscribe(
                irq_file.as_raw_fd() as usize,
                Source::Irq,
                event::EventFlags::READ,
            )
            .unwrap();

        daemon.ready().expect("ihdad: failed to signal readiness");

        libredox::call::setrens(0, 0).expect("ihdad: failed to enter null namespace");

        let mut todo = Vec::<Packet>::new();

        let all = [Source::Irq, Source::Scheme];

        'events: for event in all
            .into_iter()
            .chain(event_queue.map(|e| e.expect("failed to get next event").user_data))
        {
            match event {
                Source::Irq => {
                    let mut irq = [0; 8];
                    irq_file.read(&mut irq).unwrap();

                    if device.irq() {
                        irq_file.write(&mut irq).unwrap();

                        let mut i = 0;
                        while i < todo.len() {
                            if let Some(a) = device.handle(&mut todo[i]) {
                                let mut packet = todo.remove(i);
                                packet.a = a;
                                socket.write(&packet).unwrap();
                            } else {
                                i += 1;
                            }
                        }

                        /*
                        let next_read = device_irq.next_read();
                        if next_read > 0 {
                        return Ok(Some(next_read));
                        }
                        */
                    }
                }
                Source::Scheme => {
                    loop {
                        let mut packet = Packet::default();
                        match socket.read(&mut packet) {
                            Ok(0) => break 'events,
                            Ok(_) => (),
                            Err(err) => {
                                if err.kind() == ErrorKind::WouldBlock {
                                    break;
                                } else {
                                    panic!("ihdad: failed to read from socket: {err}");
                                }
                            }
                        }

                        if let Some(a) = device.handle(&mut packet) {
                            packet.a = a;
                            socket.write(&packet).unwrap();
                        } else {
                            todo.push(packet);
                        }
                    }

                    /*
                    let next_read = device.borrow().next_read();
                    if next_read > 0 {
                    return Ok(Some(next_read));
                    }
                    */
                }
            }
        }

        std::process::exit(0);
    }
}

fn main() {
    // Daemonize
    redox_daemon::Daemon::new(daemon).expect("ihdad: failed to daemonize");
}