pci_find_next_bus(判断是否扫描过)->pci_scan_bus_parented(扫描pci父总线) pci_create_bus( 创建总线对象,添加到pci_root_buese链表,以及建立资源管理对象Ioport、Iomem) pci_scan_child_bus(扫描子总线)->pci_scan_bridge(根据设备的类型进一次扫面,对桥的扫面)-> pci_read_config_dword(读取pci配置空间...
如上图所示:所有的根总线都链接在pci_root_buses链表中. Pci_bus ->device链表链接着该总线下的所有设备.而pci_bus->children链表链接着它的下层总线. 对于pci_dev来说,pci_dev->bus指向它所属的pci_bus. Pci_dev->bus_list链接在它所属bus的device链表上.此外,所有pci设备都链接在pci_device链表中. 三:...
>>> bus_register(&pci_bus_type) >>> bus_register(&pci_bus_type) >>> pci_bus_match() >>> pci_match_device() >>> pci_match_id() >>> pci_match_one_device() ### id->vendor == dev->vendor, id->device == dev->device >>> pci_uevent() >>> add_uevent_var() ### add...
{structbus_type *bus = bus_get(drv->bus);//找到驱动所在总线structdevice *dev;interr = -ENODEV; dev= bus_find_device_by_name(bus, NULL, buf);//通过buf中存放的设备名字找到其在内核中对应的deviceif(dev && dev->driver == drv) {//确认设备的驱动就是自己if(dev->parent)/*Needed for U...
每个PCI总线都有一个pci_bus结构与之对应。 系统中所有的根总线的pci_bus结构通过node连接起来; parent指向该总线的父总线即上一级总线; children描述这条PCI总线的子总线链表的表头; devices描述了这条PCI总线的逻辑设备链表的表头; self指向引出这条PCI总线的桥设备的pci_dev结构; ...
3.6 PCIe Reset – Cold Reset: PCI A15 pin RST – Warm Reset (LTSSM) – Hot Reset (LTSSM): PCIe Type1 Header config space offset 0x3E 16-bit Bridge Control register bit6 Secondary Bus Reset, bit6 can retrigger LTSSM Link Training from Rx.Detect – FLR (Function Level Reset): find Syn...
pci_find_capability(dev, PCI_CAP_ID_VNDR) pos = __pci_bus_find_cap_start // 判断入口点,如果是普通pci设备,返回0x34,这个地方存放cap链表的入口偏移 pos = __pci_find_next_cap // 依次搜索每一条cap,找到类型为PCI_CAP_ID_VNDR的第一个cap,返回它在配置空间的偏移 __pci_find_next_cap_ttl ...
Gazettabyte (January 19, 2022) PCI-SIG releases the next PCI Express bus specification ZDNet (January 13, 2022) SSDs and GPUs heading for a speed boost as new standard doubles bandwidth Ars Technica (January 12, 2022) PCIe 5.0 is just beginning to come to new PCs, but version 6.0 is ...
struct pci_bus * __devinit pcibios_scan_root(int busnum) { struct pci_bus *bus = NULL; struct pci_sysdata *sd; dmi_check_system(pciprobe_dmi_table); while ((bus = pci_find_next_bus(bus)) != NULL) { if (bus->number == busnum) { ...
PCI Express is like the next-gen superhero of the PCI world. It's faster, more efficient, and supports a wider bandwidth. While original PCI had a shared bus for data, PCIe uses individual lanes, like dedicated highways for data traffic, reducing congestion and speeding up communication. ...