From: Jiang Liu <jiang.liu@linux.intel.com> To: Borislav Petkov <bp@alien8.de>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Thomas Gleixner <tglx@linutronix.de>, Joerg Roedel <joro@8bytes.org> Cc: Jiang Liu <jiang.liu@linux.intel.com>, x86-ml <x86@kernel.org>, lkml <linux-kernel@vger.kernel.org>, iommu@lists.linux-foundation.org Subject: [PATCH] iommu/amd: Implement syscore_ops.shutdown() Date: Sat, 2 Aug 2014 10:25:39 +0800 [thread overview] Message-ID: <1406946339-4297-1-git-send-email-jiang.liu@linux.intel.com> (raw) In-Reply-To: <20140801225049.GC4553@pd.tnic> During hibernation or shutdown, AMD iommu generates warnings on some platforms as below: [ 89.089832] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x0000000000000080 flags=0x0020] [ 89.102239] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x0000000000000000 flags=0x0000] [ 89.114684] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.127162] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.139576] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.152017] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.164481] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] It may be caused by that the firmware takes back the device after the OS released it and now the legacy emulation tries to do DMA with it. But since there is an IOMMU the physical addresses it tries to DMA to is not mapped and it generated IO page faults. So explicitly shutdown IOMMU units during hibernation or poweroff. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> --- Hi Borislav, Could you please help to verify whether this patch help to minimize the race window and reduce IOMMU warning messages? Regards! Gerry --- drivers/iommu/amd_iommu_init.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 0e08545d7298..4d1752fe12e1 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1687,9 +1687,16 @@ static int amd_iommu_suspend(void) return 0; } +static void amd_iommu_shutdown(void) +{ + /* disable IOMMUs to go out of the way for BIOS */ + disable_iommus(); +} + static struct syscore_ops amd_iommu_syscore_ops = { .suspend = amd_iommu_suspend, .resume = amd_iommu_resume, + .shutdown = amd_iommu_shutdown, }; static void __init free_on_init_error(void) -- 1.7.10.4
WARNING: multiple messages have this Message-ID (diff)
From: Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> To: Borislav Petkov <bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org>, "Rafael J . Wysocki" <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> Cc: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, x86-ml <x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, lkml <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> Subject: [PATCH] iommu/amd: Implement syscore_ops.shutdown() Date: Sat, 2 Aug 2014 10:25:39 +0800 [thread overview] Message-ID: <1406946339-4297-1-git-send-email-jiang.liu@linux.intel.com> (raw) In-Reply-To: <20140801225049.GC4553-fF5Pk5pvG8Y@public.gmane.org> During hibernation or shutdown, AMD iommu generates warnings on some platforms as below: [ 89.089832] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x0000000000000080 flags=0x0020] [ 89.102239] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x0000000000000000 flags=0x0000] [ 89.114684] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.127162] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.139576] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.152017] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] [ 89.164481] AMD-Vi: Event logged [IO_PAGE_FAULT device=00:12.0 domain=0x0009 address=0x00000000ffffffc0 flags=0x0010] It may be caused by that the firmware takes back the device after the OS released it and now the legacy emulation tries to do DMA with it. But since there is an IOMMU the physical addresses it tries to DMA to is not mapped and it generated IO page faults. So explicitly shutdown IOMMU units during hibernation or poweroff. Signed-off-by: Jiang Liu <jiang.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org> --- Hi Borislav, Could you please help to verify whether this patch help to minimize the race window and reduce IOMMU warning messages? Regards! Gerry --- drivers/iommu/amd_iommu_init.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index 0e08545d7298..4d1752fe12e1 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1687,9 +1687,16 @@ static int amd_iommu_suspend(void) return 0; } +static void amd_iommu_shutdown(void) +{ + /* disable IOMMUs to go out of the way for BIOS */ + disable_iommus(); +} + static struct syscore_ops amd_iommu_syscore_ops = { .suspend = amd_iommu_suspend, .resume = amd_iommu_resume, + .shutdown = amd_iommu_shutdown, }; static void __init free_on_init_error(void) -- 1.7.10.4
next prev parent reply other threads:[~2014-08-02 2:22 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top [not found] <20140728175326.GA7100@pd.tnic> 2014-07-28 20:59 ` rc7 + tip/master suspend fun Rafael J. Wysocki 2014-07-28 21:02 ` Thomas Gleixner 2014-07-28 22:02 ` Rafael J. Wysocki 2014-07-29 2:17 ` Jiang Liu 2014-07-30 9:37 ` [PATCH] x86, irq: Keep IRQ assignment for PCI devices during suspend/hibernation Jiang Liu 2014-07-30 17:58 ` Borislav Petkov 2014-07-31 0:33 ` Jiang Liu 2014-07-31 10:39 ` Borislav Petkov 2014-07-31 14:41 ` Jiang Liu 2014-07-31 14:41 ` Jiang Liu 2014-07-31 15:21 ` Borislav Petkov 2014-07-31 15:21 ` Borislav Petkov 2014-07-31 16:36 ` Jiang Liu 2014-07-31 16:56 ` Borislav Petkov 2014-08-01 10:56 ` [PATCH] x86, irq: Keep IRQ assignment for PCI devices during suspend/hibernation, bisected Borislav Petkov 2014-08-01 12:27 ` Jiang Liu 2014-08-01 14:39 ` Borislav Petkov 2014-08-01 16:11 ` Borislav Petkov 2014-08-01 22:14 ` Jörg Rödel 2014-08-01 22:50 ` Borislav Petkov 2014-08-02 2:25 ` Jiang Liu [this message] 2014-08-02 2:25 ` [PATCH] iommu/amd: Implement syscore_ops.shutdown() Jiang Liu 2014-08-04 10:12 ` Borislav Petkov 2014-08-04 10:12 ` Borislav Petkov
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=1406946339-4297-1-git-send-email-jiang.liu@linux.intel.com \ --to=jiang.liu@linux.intel.com \ --cc=bp@alien8.de \ --cc=iommu@lists.linux-foundation.org \ --cc=joro@8bytes.org \ --cc=linux-kernel@vger.kernel.org \ --cc=rjw@rjwysocki.net \ --cc=tglx@linutronix.de \ --cc=x86@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: linkBe 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.