Commit cb214ede authored by Stoney Wang's avatar Stoney Wang Committed by Ingo Molnar

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: default avatarStoney Wang <song-bo.wang@hp.com>
[ updated the changelog and simplified the code ]
Signed-off-by: default avatarYinghai Lu <yinghai@kernel.org>
Cc: stable@kernel.org
Link: http://lkml.kernel.org/r/1360263182-16226-1-git-send-email-yinghai@kernel.orgSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 686966d8
...@@ -20,18 +20,19 @@ static int set_x2apic_phys_mode(char *arg) ...@@ -20,18 +20,19 @@ static int set_x2apic_phys_mode(char *arg)
} }
early_param("x2apic_phys", set_x2apic_phys_mode); 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) if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
return x2apic_enabled(); (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
else if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
(acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL) &&
x2apic_enabled()) {
printk(KERN_DEBUG "System requires x2apic physical mode\n"); printk(KERN_DEBUG "System requires x2apic physical mode\n");
return 1; return true;
} }
else return false;
return 0; }
static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
} }
static void static void
...@@ -82,7 +83,7 @@ static void init_x2apic_ldr(void) ...@@ -82,7 +83,7 @@ static void init_x2apic_ldr(void)
static int x2apic_phys_probe(void) static int x2apic_phys_probe(void)
{ {
if (x2apic_mode && x2apic_phys) if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
return 1; return 1;
return apic == &apic_x2apic_phys; return apic == &apic_x2apic_phys;
......
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