From: tip-bot for Stoney Wang <song-bo.wang@hp.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org,
yinghai@kernel.org, song-bo.wang@hp.com, tglx@linutronix.de
Subject: [tip:x86/urgent] x86/apic: Work around boot failure on HP ProLiant DL980 G7 Server systems
Date: Mon, 11 Feb 2013 04:37:11 -0800 [thread overview]
Message-ID: <tip-cb214ede7657db458fd0b2a25ea0b28dbf900ebc@git.kernel.org> (raw)
In-Reply-To: <1360263182-16226-1-git-send-email-yinghai@kernel.org>
Commit-ID: cb214ede7657db458fd0b2a25ea0b28dbf900ebc
Gitweb: http://git.kernel.org/tip/cb214ede7657db458fd0b2a25ea0b28dbf900ebc
Author: Stoney Wang <song-bo.wang@hp.com>
AuthorDate: Thu, 7 Feb 2013 10:53:02 -0800
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Mon, 11 Feb 2013 11:13:00 +0100
x86/apic: Work around boot failure on HP ProLiant DL980 G7 Server systems
When a HP ProLiant DL980 G7 Server boots a regular kernel,
there will be intermittent lost interrupts which could
result in a hang or (in extreme cases) data loss.
The reason is that this system only supports x2apic physical
mode, while the kernel boots with a logical-cluster default
setting.
This bug can be worked around by specifying the "x2apic_phys" or
"nox2apic" boot option, but we want to handle this system
without requiring manual workarounds.
The BIOS sets ACPI_FADT_APIC_PHYSICAL in FADT table.
As all apicids are smaller than 255, BIOS need to pass the
control to the OS with xapic mode, according to x2apic-spec,
chapter 2.9.
Current code handle x2apic when BIOS pass with xapic mode
enabled:
When user specifies x2apic_phys, or FADT indicates PHYSICAL:
1. During madt oem check, apic driver is set with xapic logical
or xapic phys driver at first.
2. enable_IR_x2apic() will enable x2apic_mode.
3. if user specifies x2apic_phys on the boot line, x2apic_phys_probe()
will install the correct x2apic phys driver and use x2apic phys mode.
Otherwise it will skip the driver will let x2apic_cluster_probe to
take over to install x2apic cluster driver (wrong one) even though FADT
indicates PHYSICAL, because x2apic_phys_probe does not check
FADT PHYSICAL.
Add checking x2apic_fadt_phys in x2apic_phys_probe() to fix the
problem.
Signed-off-by: Stoney Wang <song-bo.wang@hp.com>
[ updated the changelog and simplified the code ]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1360263182-16226-1-git-send-email-yinghai@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
arch/x86/kernel/apic/x2apic_phys.c | 21 +++++++++++----------
1 file changed, 11 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index e03a1e1..562a76d 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -20,18 +20,19 @@ static int set_x2apic_phys_mode(char *arg)
}
early_param("x2apic_phys", set_x2apic_phys_mode);
-static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+static bool x2apic_fadt_phys(void)
{
- if (x2apic_phys)
- return x2apic_enabled();
- else if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
- (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL) &&
- x2apic_enabled()) {
+ if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
+ (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
printk(KERN_DEBUG "System requires x2apic physical mode\n");
- return 1;
+ return true;
}
- else
- return 0;
+ return false;
+}
+
+static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
+{
+ return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
}
static void
@@ -82,7 +83,7 @@ static void init_x2apic_ldr(void)
static int x2apic_phys_probe(void)
{
- if (x2apic_mode && x2apic_phys)
+ if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
return 1;
return apic == &apic_x2apic_phys;
next prev parent reply other threads:[~2013-02-11 12:37 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-15 1:50 [PATCH] x86/apic: check FADT settings after enable x2apic Stoney Wang
2013-01-28 5:05 ` Wang, Song-Bo (Stoney)
2013-01-28 6:57 ` Yinghai Lu
2013-01-28 10:11 ` Ingo Molnar
2013-01-28 18:10 ` Yinghai Lu
2013-01-29 7:47 ` Ingo Molnar
2013-01-29 8:43 ` Wang, Song-Bo (Stoney)
2013-01-29 8:49 ` Ingo Molnar
2013-01-29 21:30 ` Yinghai Lu
2013-01-29 21:52 ` Yinghai Lu
2013-01-31 11:32 ` Ingo Molnar
2013-01-31 15:56 ` Yinghai Lu
2013-02-04 6:41 ` Wang, Song-Bo (Stoney)
2013-02-04 11:03 ` Ingo Molnar
2013-02-04 20:29 ` [PATCH] x86, apic: Check fadt x2apic phys in x2apic_phys_probe() Yinghai Lu
2013-02-05 12:24 ` Ingo Molnar
2013-02-05 16:53 ` Yinghai Lu
2013-02-06 13:16 ` Ingo Molnar
2013-02-06 17:10 ` Yinghai Lu
2013-02-07 18:53 ` [PATCH v4] " Yinghai Lu
2013-02-11 12:37 ` tip-bot for Stoney Wang [this message]
2013-02-18 8:52 ` Lin-Bao Zhang
2013-02-18 17:13 ` Yinghai Lu
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