linux – 如何解释/ proc / bus / pci / devices的内容？

“cat / proc / bus / pci / devices”的前几个字段是可以理解的.

字段1 – BusDevFunc
字段2 – 供应商ID设备标识
字段3 – 中断线
字段4 – BAR 0
和其余的BAR寄存器(0-5)之后.

打印出BAR寄存器后,其他字段是什么？具体来说,打印出PCI配置空间寄存器(偏移量)？

解决方法

这是内核中相应的代码：

static int show_device(struct seq_file *m,void *v)
{
    const struct pci_dev *dev = v;
    const struct pci_driver *drv;
    int i;

    if (dev == NULL)
        return 0;

    drv = pci_dev_driver(dev);
    seq_printf(m,"%02x%02x\t%04x%04x\t%x",dev->bus->number,dev->devfn,dev->vendor,dev->device,dev->irq);
    /* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
    for (i=0; i<7; i++) {
        resource_size_t start,end;
        pci_resource_to_user(dev,i,&dev->resource[i],&start,&end);
        seq_printf(m,"\t%16llx",(unsigned long long)(start |
            (dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
    }
    for (i=0; i<7; i++) {
        resource_size_t start,dev->resource[i].start < dev->resource[i].end ?
            (unsigned long long)(end - start) + 1 : 0);
    }
    seq_putc(m,'\t');
    if (drv)
        seq_printf(m,"%s",drv->name);
    seq_putc(m,'\n');
    return 0;
}

在IRQ之后,它似乎是与前6个资源区域的标志相结合的起始地址,其后是这些资源区域的长度,后面是已声明设备的驱动程序的名称.