我可以在INSMOD或MODPROBE期间将参数传递给驱动程序吗？

Question

I currently worte a USB device driver in which I created a Kthread from probe() function. The general kthread_create() function creates thread on the CPU which is least busy.

What I want to do is create kthread on a particular CPU (kthread_create_on_cpu()), so that I can assign seperate core to device threads dealing with output devices.
How can I pass the CPU number to module when the module/driver is being loaded.

Either I can use a global variable which will be set once when the system boots up and will be read by drivers OR pass CPU number to module while it's being loaded.

Please suggest which method will be more feasible to use and implement.

Thanks and Regards,
Mitesh G

Answer 1

You can pass command line arguments. For this you have to add module_param or module_param_array in module.

Add these lines in your modules of course according to your requirements

int myintdata = 100; module_param(myintdata, int, 0);

char mychardata = 'A'; module_param(mychardata, char, 0);

int myarray[2]; module_param_array(myarray, int, NULL, 0);

static char *name; module_param(name, charp, 0); // here you have to mention charp as data type

or module_param_string(name, string, len, perm); for String

while inserting modules

insmod module_name.ko myintdata=5 mychardata = 'X' name= "xyz" myarray =99,100 `