Linux核心数据结构--pci_dev

最新推荐文章于 2025-05-18 09:32:42 发布

最新推荐文章于 2025-05-18 09:32:42 发布 · 426 阅读

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本文介绍了系统中PCI设备的结构定义，包括PCI-PCI和PCI-PCI桥接器等。详细解释了pci_dev结构中的各个字段含义，如bus、vendor、device、irq等，并说明了这些字段如何帮助操作系统识别和管理PCI设备。

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表示系统中的每个PCI设备，包括PCI-PCI和PCI-PCI桥接器。

[i]/*

* There is one pci_dev structure for each slot-number/function-number

* combination:

*/[/i]

[b]struct pci_dev {

struct pci_bus *bus;[/b] [i] /* bus this device is on */[/i]

[b]struct pci_dev *sibling;[/b] [i]/* next device on this bus */[/i]
[b] struct pci_dev *next; [/b] [i]/* chain of all devices */[/i]

[b]void *sysdata;[/b] [i]/* hook for sys-specific extension */[/i]

[b]unsigned int devfn;[/b] [i]/* encoded device & function index */[/i]

[b] unsigned short vendor;

unsigned short device;

unsigned int class; [/b] [i]/* 3 bytes: (base,sub,prog-if) */[/i]
[b]unsigned int master : 1;[/b] [i]/* set if device is master capable */[/i]

[i] /*

* In theory, the irq level can be read from configuration

* space and all would be fine. However, old PCI chips don't

* support these registers and return 0 instead. For example,

* the Vision864-P rev 0 chip can uses INTA, but returns 0 in

* the interrupt line and pin registers. pci_init()

* initializes this field with the value at PCI_INTERRUPT_LINE

* and it is the job of pcibios_fixup() to change it if

* necessary. The field must not be 0 unless the device

* cannot generate interrupts at all.

*/[/i]

[b]unsigned char irq;[/b] [i]/* irq generated by this device */[/i]
[b]
};[/b]