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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


WARNING: multiple messages have this Message-ID (diff)
From: wangkefeng.wang@huawei.com (Kefeng Wang)
To: linux-arm-kernel@lists.infradead.org
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

             reply	other threads:[~2016-03-23  3:14 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-23  3:12 Kefeng Wang [this message]
2016-03-23  3:12 ` Question about PCI I/O space in ARM64 Kefeng Wang
2016-03-23 10:18 ` Catalin Marinas
2016-03-23 12:26   ` Arnd Bergmann
2016-03-23 12:26     ` Arnd Bergmann
2016-03-24  3:14     ` Kefeng Wang
2016-03-24  3:14       ` Kefeng Wang
2016-03-24 17:57       ` Lorenzo Pieralisi
2016-03-24 17:57         ` Lorenzo Pieralisi
2016-03-25  6:49         ` Kefeng Wang
2016-03-25  6:49           ` Kefeng Wang

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