From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from szxga02-in.huawei.com ([119.145.14.65]:29289 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750921AbcCWDOo (ORCPT ); Tue, 22 Mar 2016 23:14:44 -0400 To: , , linux-arm-kernel , CC: Gabriele Paoloni , Arnd Bergmann , , , Linuxarm , Zhou Wang From: Kefeng Wang Subject: Question about PCI I/O space in ARM64 Message-ID: <56F209A9.4040304@huawei.com> Date: Wed, 23 Mar 2016 11:12:41 +0800 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Sender: linux-pci-owner@vger.kernel.org List-ID: Hi all， If no pci, the PCI I/O space(16M) is mapped into an irrelevant mem space(right ?), 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] ------------------------ 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. Thanks Kefeng From mboxrd@z Thu Jan 1 00:00:00 1970 From: wangkefeng.wang@huawei.com (Kefeng Wang) Date: Wed, 23 Mar 2016 11:12:41 +0800 Subject: Question about PCI I/O space in ARM64 Message-ID: <56F209A9.4040304@huawei.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi all? If no pci, the PCI I/O space(16M) is mapped into an irrelevant mem space(right ?), 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] ------------------------ 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. Thanks Kefeng