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| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2010-11-30 22:22:28 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-01-07 14:43:11 -0800 |
| commit | 3e300d45b2802dfc7ba8ff7d02463857e718bc4f (patch) | |
| tree | f0d8151988f9e5d11d0a7cd43e5d4b0bf37c2fcb | |
| parent | ed215240d3a6a99573660e33e3034202368d025e (diff) | |
| download | lwn-3e300d45b2802dfc7ba8ff7d02463857e718bc4f.tar.gz lwn-3e300d45b2802dfc7ba8ff7d02463857e718bc4f.zip | |
x86: Enable the intr-remap fault handling after local APIC setup
commit 7f7fbf45c6b748074546f7f16b9488ca71de99c1 upstream.
Interrupt-remapping gets enabled very early in the boot, as it determines the
apic mode that the processor can use. And the current code enables the vt-d
fault handling before the setup_local_APIC(). And hence the APIC LDR registers
and data structure in the memory may not be initialized. So the vt-d fault
handling in logical xapic/x2apic modes were broken.
Fix this by enabling the vt-d fault handling in the end_local_APIC_setup()
A cleaner fix of enabling fault handling while enabling intr-remapping
will be addressed for v2.6.38. [ Enabling intr-remapping determines the
usage of x2apic mode and the apic mode determines the fault-handling
configuration. ]
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
LKML-Reference: <20101201062244.541996375@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 8 | ||||
| -rw-r--r-- | arch/x86/kernel/apic/probe_64.c | 7 |
2 files changed, 8 insertions, 7 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 6702ab74c58c..1d2d6704f5d1 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1361,6 +1361,14 @@ void __cpuinit end_local_APIC_setup(void) setup_apic_nmi_watchdog(NULL); apic_pm_activate(); + + /* + * Now that local APIC setup is completed for BP, configure the fault + * handling for interrupt remapping. + */ + if (!smp_processor_id() && intr_remapping_enabled) + enable_drhd_fault_handling(); + } #ifdef CONFIG_X86_X2APIC diff --git a/arch/x86/kernel/apic/probe_64.c b/arch/x86/kernel/apic/probe_64.c index 4c56f544f167..9924e72069e5 100644 --- a/arch/x86/kernel/apic/probe_64.c +++ b/arch/x86/kernel/apic/probe_64.c @@ -76,13 +76,6 @@ void __init default_setup_apic_routing(void) /* need to update phys_pkg_id */ apic->phys_pkg_id = apicid_phys_pkg_id; } - - /* - * Now that apic routing model is selected, configure the - * fault handling for intr remapping. - */ - if (intr_remapping_enabled) - enable_drhd_fault_handling(); } /* Same for both flat and physical. */ |