On Wed, Mar 23, 2016 at 11:12:41AM +0800, Kefeng Wang wrote: > If no pci, the PCI I/O space(16M) is mapped into an irrelevant mem space(right ?), No. It is not mapped at all. > not a right IO space, > that is, no one call pci_remap_iospace() to remap the memory mapped I/O space, once driver > like f71805f loaded, write value to IO space(see f71805f_init->f71805f_find->superio_enter->outb), > we met following oops, > ------------------------ > Unable to handle kernel paging request at virtual address ffffffbffee0002e > pgd = ffffffc1d68d4000 > [ffffffbffee0002e] *pgd=0000000000000000, *pud=0000000000000000 > Internal error: Oops: 94000046 [#1] PREEMPT SMP > Modules linked in: f71805f(+) hwmon > CPU: 3 PID: 1659 Comm: insmod Not tainted 4.5.0+ #88 > Hardware name: linux,dummy-virt (DT) > task: ffffffc1f6665400 ti: ffffffc1d6418000 task.ti: ffffffc1d6418000 > PC is at f71805f_find+0x6c/0x358 [f71805f] > ------------------------ That's caused by not having a mapped PCI I/O space. > I am not clear about PCI I/O, but if this is indeed a bug, how to solve this issue, > any advice will be appreciated. You need a PCI host controller driver (e.g. drivers/pci/host/pci-host-generic.c) and corresponding bindings in DT or ACPI. -- Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
