一个法国人写的虚拟PCI设备驱动

almeydifer

模块可以加载，但是probe函数不知道怎么回事，还是不能自己调用，不知道要做些什么其他的步骤。

almeydifer

static int pci_probe(struct pci_dev *dev, const struct pci_device_id *id) { &nbsp;&nbsp;&nbsp;&nbsp;int ret, minor; &nbsp;&nbsp;&nbsp;&nbsp;struct cdev *cdev; &nbsp;&nbsp;&nbsp;&nbsp;dev_t devno; &nbsp;&nbsp;&nbsp;&nbsp;/* add this pci device in pci_cdev */ &nbsp;&nbsp;&nbsp;&nbsp;if ((minor = pci_cdev_add(pci_cdev, MAX_DEVICE, dev)) < 0) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;goto error; &nbsp;&nbsp;&nbsp;&nbsp;/* compute major/minor number */ &nbsp;&nbsp;&nbsp;&nbsp;devno = MKDEV(major, minor); &nbsp;&nbsp;&nbsp;&nbsp;/* allocate struct cdev */ &nbsp;&nbsp;&nbsp;&nbsp;cdev = cdev_alloc(); &nbsp;&nbsp;&nbsp;&nbsp;/* initialise struct cdev */ &nbsp;&nbsp;&nbsp;&nbsp;cdev_init(cdev, &pci_ops); &nbsp;&nbsp;&nbsp;&nbsp;cdev->owner = THIS_MODULE; &nbsp;&nbsp;&nbsp;&nbsp;/* register cdev */ &nbsp;&nbsp;&nbsp;&nbsp;ret = cdev_add(cdev, devno, 1); &nbsp;&nbsp;&nbsp;&nbsp;if (ret < 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev_err(&(dev->dev), "Can't register character device\n"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;goto error; &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;pci_cdev[minor].cdev = cdev; &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "%s The major device number is %d (%d).\n", &nbsp;&nbsp;&nbsp;&nbsp;       "Registeration is a success", MAJOR(devno), MINOR(devno)); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "If you want to talk to the device driver,\n"); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "you'll have to create a device file. \n"); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "We suggest you use:\n"); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "mknod %s c %d %d\n", DEVICE_NAME, MAJOR(devno), MINOR(devno)); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "The device file name is important, because\n"); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "the ioctl program assumes that's the\n"); &nbsp;&nbsp;&nbsp;&nbsp;dev_info(&(dev->dev), "file you'll use.\n"); &nbsp;&nbsp;&nbsp;&nbsp;/* enable the device */ &nbsp;&nbsp;&nbsp;&nbsp;pci_enable_device(dev); &nbsp;&nbsp;&nbsp;&nbsp;/* 'alloc' IO to talk with the card */ &nbsp;&nbsp;&nbsp;&nbsp;if (pci_request_region(dev, BAR_IO, "IO-pci") == 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev_err(&(dev->dev), "Can't request BAR2\n"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cdev_del(cdev); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;goto error; &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;/* check that BAR_IO is *really* IO region */ &nbsp;&nbsp;&nbsp;&nbsp;if ((pci_resource_flags(dev, BAR_IO) & IORESOURCE_IO) != IORESOURCE_IO) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;dev_err(&(dev->dev), "BAR2 isn't an IO region\n"); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;cdev_del(cdev); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;goto error; &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;return 1; error: &nbsp;&nbsp;&nbsp;&nbsp;return 0; }

almeydifer

这个应该写的很初级了，probe函数怎么就是调用不起来呢？
盼解答

emmoblin

网卡就是典型的pci设备。probe函数是系统调用的

tonyen

必须注册了device才会调用该driver的probe.

kissGNU

原帖由 tonyen 于 2009-4-10 17:59 发表
必须注册了device才会调用该driver的probe.

是这样的。
不防设想device已经注册挂载到pci_bus上了，然后加载pci 驱动，会做如下的事：
在安装pci驱动的时候，会遍历这个驱动对应的总线上拥有的各个设备，对每个设备分别调用__driver_attach(drv,dev)函数来尝试
将其与驱动匹配绑定，如果能成功就说明那个设备与本驱动match上了。

__driver_attach()函数主要调用driver_probe_device()，其用总线的match()函数来判断drv与dev是否匹配，用really_probe()
引用注册的用户定义的xxx_probe()来完成绑定。