From: Laura Abbott <labbott@redhat.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Warning from AMD IOMMU performance counters
Date: Fri, 19 Feb 2016 14:35:36 -0800 [thread overview]
Message-ID: <56C798B8.6080009@redhat.com> (raw)
Hi,
Since about 4.4, we've been seeing reports of this warning on every boot
from some users:
WARNING: CPU: 2 PID: 1 at drivers/iommu/amd_iommu_init.c:2301 amd_iommu_pc_get_set_reg_val+0xa8/0xe0()
Modules linked in:
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.4.2-300.fc23.x86_64 #1
Hardware name: Hewlett-Packard HP EliteBook 755 G2/221C, BIOS M84 Ver. 01.10 10/20/2015
0000000000000000 0000000026124b43 ffff88042d687d20 ffffffff813b0c9f
0000000000000000 ffff88042d687d58 ffffffff810a2f12 ffff88042f014800
0000000000000040 0000000000000000 ffffffff81d6c73d 0000000000000000
Call Trace:
[<ffffffff813b0c9f>] dump_stack+0x44/0x55
[<ffffffff810a2f12>] warn_slowpath_common+0x82/0xc0
[<ffffffff81d6c73d>] ? memblock_find_dma_reserve+0x16a/0x16a
[<ffffffff810a305a>] warn_slowpath_null+0x1a/0x20
[<ffffffff814d3f48>] amd_iommu_pc_get_set_reg_val+0xa8/0xe0
[<ffffffff81dafda7>] iommu_go_to_state+0x4d6/0x1384
[<ffffffff813c02ea>] ? kvasprintf+0x7a/0xa0
[<ffffffff81d6c73d>] ? memblock_find_dma_reserve+0x16a/0x16a
[<ffffffff81db0cbd>] amd_iommu_init+0x13/0x201
[<ffffffff81d6c74f>] pci_iommu_init+0x12/0x3c
[<ffffffff81002123>] do_one_initcall+0xb3/0x200
[<ffffffff810c0935>] ? parse_args+0x295/0x4b0
[<ffffffff81d621c8>] kernel_init_freeable+0x189/0x223
[<ffffffff8178dc00>] ? rest_init+0x80/0x80
[<ffffffff8178dc0e>] kernel_init+0xe/0xe0
[<ffffffff81799c8f>] ret_from_fork+0x3f/0x70
[<ffffffff8178dc00>] ? rest_init+0x80/0x80
Full bugzilla https://bugzilla.redhat.com/show_bug.cgi?id=1310258
Any idea what might be causing this spew?
Thanks,
Laura
next reply other threads:[~2016-02-19 22:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-19 22:35 Laura Abbott [this message]
[not found] ` <56C798B8.6080009-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-22 1:52 ` Warning from AMD IOMMU performance counters Wan Zongshun
2016-02-22 1:52 ` Wan Zongshun
[not found] ` <56CA69C7.3050508-6ukY98dZOFrYtjvyW6yDsg@public.gmane.org>
2016-02-23 1:36 ` Laura Abbott
2016-02-23 1:36 ` Laura Abbott
2016-02-23 17:26 ` Laura Abbott
[not found] ` <56CC963A.1080607-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-02-23 17:51 ` Borislav Petkov
2016-02-23 17:51 ` Borislav Petkov
[not found] ` <20160223175113.GA3711-fF5Pk5pvG8Y@public.gmane.org>
2016-02-25 14:57 ` Joerg Roedel
2016-02-25 14:57 ` Joerg Roedel
[not found] ` <20160225145716.GA18581-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
2016-02-25 17:47 ` Laura Abbott
2016-02-25 17:47 ` Laura Abbott
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=56C798B8.6080009@redhat.com \
--to=labbott@redhat.com \
--cc=iommu@lists.linux-foundation.org \
--cc=joro@8bytes.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.