1 use super::transport_pci::PciTransport; 2 use super::virtio_impl::HalImpl; 3 use crate::driver::net::virtio_net::virtio_net; 4 use crate::driver::pci::pci::{ 5 get_pci_device_structure_mut, PciDeviceStructure, PciDeviceStructureGeneralDevice, 6 PCI_DEVICE_LINKEDLIST, 7 }; 8 use crate::libs::rwlock::RwLockWriteGuard; 9 use crate::{kdebug, kerror, kwarn}; 10 use alloc::{boxed::Box, collections::LinkedList}; 11 use virtio_drivers::transport::{DeviceType, Transport}; 12 const NETWORK_CLASS: u8 = 0x2; 13 const ETHERNET_SUBCLASS: u8 = 0x0; 14 15 //Virtio设备寻找过程中出现的问题 16 enum VirtioError { 17 VirtioNetNotFound, 18 NetDeviceNotFound, 19 } 20 21 ///@brief 寻找并加载所有virtio设备的驱动（目前只有virtio-net，但其他virtio设备也可添加） 22 pub fn virtio_probe() { 23 let mut list = PCI_DEVICE_LINKEDLIST.write(); 24 if let Ok(virtio_list) = virtio_device_search(&mut list) { 25 for virtio_device in virtio_list { 26 match PciTransport::new::<HalImpl>(virtio_device) { 27 Ok(mut transport) => { 28 kdebug!( 29 "Detected virtio PCI device with device type {:?}, features {:#018x}", 30 transport.device_type(), 31 transport.read_device_features(), 32 ); 33 virtio_device_init(transport); 34 } 35 Err(err) => { 36 kerror!("Pci transport create failed because of error: {}", err); 37 } 38 } 39 } 40 } else { 41 kerror!("Error occured when finding virtio device!"); 42 } 43 } 44 45 ///@brief 为virtio设备寻找对应的驱动进行初始化 46 fn virtio_device_init(transport: impl Transport + 'static) { 47 match transport.device_type() { 48 DeviceType::Block => { 49 kwarn!("Not support virtio_block device for now"); 50 } 51 DeviceType::GPU => { 52 kwarn!("Not support virtio_gpu device for now"); 53 } 54 DeviceType::Input => { 55 kwarn!("Not support virtio_input device for now"); 56 } 57 DeviceType::Network => virtio_net(transport), 58 t => { 59 kwarn!("Unrecognized virtio device: {:?}", t); 60 } 61 } 62 } 63 64 /// @brief 寻找所有的virtio设备 65 /// @param list 链表的写锁 66 /// @return Result<LinkedList<&'a mut Pci_Device_Structure_General_Device>, VirtioError> 成功则返回包含所有virtio设备结构体的可变引用的链表，失败则返回err 67 /// 该函数主要是为其他virtio设备预留支持 68 fn virtio_device_search<'a>( 69 list: &'a mut RwLockWriteGuard<'_, LinkedList<Box<dyn PciDeviceStructure>>>, 70 ) -> Result<LinkedList<&'a mut PciDeviceStructureGeneralDevice>, VirtioError> { 71 let mut virtio_list: LinkedList<&mut PciDeviceStructureGeneralDevice> = LinkedList::new(); 72 let virtio_net_device = get_virtio_net_device(list)?; 73 virtio_list.push_back(virtio_net_device); 74 Ok(virtio_list) 75 } 76 77 /// @brief 寻找virtio-net设备 78 /// @param list 链表的写锁 79 /// @return Result<&'a mut Pci_Device_Structure_General_Device, VirtioError> 成功则返回virtio设备结构体的可变引用，失败则返回err 80 fn get_virtio_net_device<'a>( 81 list: &'a mut RwLockWriteGuard<'_, LinkedList<Box<dyn PciDeviceStructure>>>, 82 ) -> Result<&'a mut PciDeviceStructureGeneralDevice, VirtioError> { 83 let result = get_pci_device_structure_mut(list, NETWORK_CLASS, ETHERNET_SUBCLASS); 84 if result.is_empty() { 85 return Err(VirtioError::NetDeviceNotFound); 86 } 87 for device in result { 88 let standard_device = device.as_standard_device_mut().unwrap(); 89 let header = &standard_device.common_header; 90 if header.vendor_id == 0x1AF4 91 && header.device_id >= 0x1000 92 && header.device_id <= 0x103F 93 && standard_device.subsystem_id == 1 94 { 95 return Ok(standard_device); 96 } 97 } 98 Err(VirtioError::VirtioNetNotFound) 99 } 100