Secondary video cards need to be reset before they will work. How can we get the kernel to do this? I can not come up with a good solution for triggering this from a device driver.
One sequence I tried: modprobe driver driver registers sysfs class and triggers hotplug probe code fail because HW is not reset user space hotplug reset app runs when reset is finished poke a sysfs attribute in attribute handler reprobe the card The sequence needs to be tolerant of the user space hotplug app failing It also has to handle a rmmod of the driver while the user space app is running An alternative is to put a emu86 execution module into the kernel. That will allow the reset to occur synchronously. The linuxbios people have one that is about 40-50K in size. Another solution would be to have the PCI subsystem track devices that have not been reset yet. modprobe of a driver would trigger a hotplug reset event and fail the modprobe. The user space reset app would tell the PCI subsystem when the hardware was successfully reset. After that the modprobe would be allow to procede like normal. I haven't been able to come up with a reliable way to call a user space reset program from a driver's probe function except with an in-kernel emu86. Is there another way? I'd also like to try an find a solution that doesn't need to modify the 73 existing framebuffer drivers. -- Jon Smirl [EMAIL PROTECTED] - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
