From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: <linux-pci@vger.kernel.org>, <catalin.marinas@arm.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
<wangkefeng.wang@huawei.com>
Cc: Gabriele Paoloni <gabriele.paoloni@huawei.com>,
Arnd Bergmann <arnd@arndb.de>, <linux-kernel@vger.kernel.org>,
<Lorenzo.Pieralisi@arm.com>, Linuxarm <linuxarm@huawei.com>,
Zhou Wang <wangzhou1@hisilicon.com>
Subject: Question about PCI I/O space in ARM64
Date: Wed, 23 Mar 2016 11:12:41 +0800 [thread overview]
Message-ID: <56F209A9.4040304@huawei.com> (raw)
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
next reply other threads:[~2016-03-23 3:14 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-23 3:12 Kefeng Wang [this message]
2016-03-23 10:18 ` Question about PCI I/O space in ARM64 Catalin Marinas
2016-03-23 12:26 ` Arnd Bergmann
2016-03-24 3:14 ` Kefeng Wang
2016-03-24 17:57 ` Lorenzo Pieralisi
2016-03-25 6:49 ` Kefeng Wang
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