Nate & Ali,
Thank you very much, I had to learn the PCI kernel interface (real easy),
and now the device driver and hardware are interacting perfectly. Thanks!
Looking at the ide stuff in (src/dev/ide_ctrl.cc &
src/python/m5/objects/Ide.py) helped a lot.
~Paul
The reason you had a problem with this was IRQ 5 (ipl=25 is a special
level). I can't remember what it is supposed to to do, but that
functionality isn't implemented. You're getting the panic as the
palcode sees this weird interrupt and then tries to access some
processor register that is physically mapped that doesn't exist. Like
Nate said, you should implement PCI config space and not try to add
an interrupt level, there is a great deal of complexity here that
spans the kernel, palcode, and the hardware emulation.
Ali
You should look at how the ethernet and ide devices do this. You
don't need to do these kind of modifications to the devices.
Instead, you should make your device implement the PCI
configuration stuff and allocate an interrupt that way. And in
case you were worried, M5 doesn't actually require that a device
that supports PCI actually be hooked up to some sort of PCI bus.
I've stuck "PCI" devices on the L1-L2 bus.
Nate
I'm trying to create a new device (for alpha full-system) that
interacts with the a device driver, that I wrote, in the linux
kernel via interrupts.
I have cross-compiled a device driver for alpha against the kernel
being used by m5 (2.6.13). I am able to load the kernel and start
the device driver. The device driver does successfully request IRQ 5.
(Here is the request call in the device driver:
result = request_irq(short_irq, short_sh_interrupt,
SA_SHIRQ | SA_INTERRUPT,"short",
short_sh_interrupt);
naturally short_irq=5 and short_sh_interrupt is a function)
I call "tsunami->intrctrl->post(0, TheISA::INTLEVEL_IRQ5, 55);" to
place the interrupt. (I created INTLEVEL_IRQ5 in arch/alpha/
isa_traits.hh to be 25 (right after IRQ 4). Furthermore, I am
using only one CPU (currently) so the first parameter (0) should
be correct.)
Now, after the kernel is loaded, I start the device driver (which,
again, reports that it successfully acquired IRQ 5). Then I have
m5 generate the interrupt via the call to tsunami and I get the
following:
panic: Unable to find responder for address pa = 0XFFFFF00188 va =
0XFFFFF00188 @ cycle 10311544851500
I turned on the "Flow" trace flag and would get:
10311544812000: global: Interrupt! IPLR=0 ipl=25 summary=2000000
right before the panic.
Does something need to be implemented, or am I setting this up wrong?
Thanks,
~Paul
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