loongarch 3a6000 ivc通信

目录

• hvisor 与ivc相关的加载步骤
• 修改 ivc_driver.c
• 修改了linux1/2/3.dts的设备树
• ivc.ko 要用两个不同版本的 linux 源码来编译
• 修改board.rs
• 中断部分调用链

hvisor 与ivc相关的加载步骤

rust_main（src/main.rs)--->primary_init_early(src/main.rs)--->zone_create(src/main.rs->src/zone.rs)--->arch_zone_pre_configuration(src/arch/loongarch64/zone.rs)--->ivc_init(src/arch/loongarch64/ivc.rs)

其中 platform_root_zone_config 读取 ROOT_ZONE_IVC_CONFIG 和 ROOT_ZONE_IRQS

pub struct Zone {
    pub name: [u8; CONFIG_NAME_MAXLEN],
    pub id: usize,
    pub mmio: Vec<MMIOConfig>,
    pub cpu_num: usize,
    pub cpu_set: CpuSet,
    pub irq_bitmap: [u32; 1024 / 32],
    pub gpm: MemorySet<Stage2PageTable>,
    pub pciroot: PciRoot,
    pub iommu_pt: Option<MemorySet<Stage2PageTable>>,
    pub is_err: bool,
}

pub struct HvZoneConfig {
    pub zone_id: u32,
    cpus: u64,
    num_memory_regions: u32,
    memory_regions: [HvConfigMemoryRegion; CONFIG_MAX_MEMORY_REGIONS],
    num_interrupts: u32,
    interrupts: [u32; CONFIG_MAX_INTERRUPTS],
    num_ivc_configs: u32,
    ivc_configs: [HvIvcConfig; CONFIG_MAX_IVC_CONFIGS],
    pub entry_point: u64,
    pub kernel_load_paddr: u64,
    pub kernel_size: u64,
    pub dtb_load_paddr: u64,
    pub dtb_size: u64,
    pub name: [u8; CONFIG_NAME_MAXLEN],
    pub arch_config: HvArchZoneConfig,
    pub pci_config: HvPciConfig,
    pub num_pci_devs: u64,
    pub alloc_pci_devs: [u64; CONFIG_MAX_PCI_DEV],
}

HvZoneConfig::new(
        0,
        ROOT_ZONE_CPUS,
        ROOT_ZONE_MEMORY_REGIONS.len() as u32,
        memory_regions,
        ROOT_ZONE_IRQS.len() as u32,
        interrupts,
        _num_ivc_configs as _,
        ivc_configs,
        ROOT_ZONE_ENTRY,
        ROOT_ZONE_KERNEL_ADDR,
        INVALID_ADDRESS as _,
        ROOT_ZONE_DTB_ADDR,
        INVALID_ADDRESS as _,
        name,
        ROOT_ARCH_ZONE_CONFIG,
        _root_pci_cfg,
        _num_pci_devs,
        pci_devs,
    )

修改 ivc_driver.c

本来只有arm64架构的相关接口代码，添加了loongarch架构的代码

在 hvisor-tool 目录下执行：

make all ARCH=loongarch LOG=LOG_WARN KDIR=对应的linux源码目录

修改了linux1/2/3.dts的设备树

添加了如下

    hvisor_ivc_device {
        compatible = "hvisor";
        interrupts = <0x00 0x22 0x01>;
    };

ivc.ko 要用两个不同版本的 linux 源码来编译

修改board.rs

pub const ROOT_ZONE_IVC_CONFIG: [HvIvcConfig; 1] = [
    HvIvcConfig {
    	ivc_id: 0,
    	peer_id: 0,
    	control_table_ipa: 0x1400_0000,   
    	shared_mem_ipa:  0x1400_1000,   
    	rw_sec_size:     0,    
    	out_sec_size:    0x1000,    
    	interrupt_num:   65,            
    	max_peers:       4,
	},
];

pub const ZONE1_IVC_CONFIG: [HvIvcConfig; 1] = [
    HvIvcConfig {
    	ivc_id: 0,
    	peer_id: 1,
    	control_table_ipa: 0x1408_0000,
    	shared_mem_ipa:  0x1408_1000,
    	rw_sec_size:     0,
    	out_sec_size:    0x1000,
    	interrupt_num:   66,
    	max_peers:       4,
    	},
];

中断部分调用链

_hyp_trap_vector
trap_handler
handle_exception
handle_interrupt(is)
clear_hwi_injected_irq
gintc::set_hwis(0)
check_events
arch_check_events(event)
clear_hwi_injected_irq
gintc::set_hwis(0)