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authorSuresh Siddha <suresh.b.siddha@intel.com>2012-06-25 13:38:28 -0700
committerIngo Molnar <mingo@kernel.org>2012-07-06 11:00:22 +0200
commit1ac322d0b169c95ce34d55b3ed6d40ce1a5f3a02 (patch)
tree21a911ca299c18c3c29569af1abf768230c7990a /arch/x86/kernel/vsmp_64.c
parentb39f25a849d7677a7dbf183f2483fd41c201a5ce (diff)
downloadlinux-1ac322d0b169c95ce34d55b3ed6d40ce1a5f3a02.tar.gz
x86/apic/x2apic: Limit the vector reservation to the user specified mask
For the x2apic cluster mode, vector for an interrupt is currently reserved on all the cpu's that are part of the x2apic cluster. But the interrupts will be routed only to the cluster (derived from the first cpu in the mask) members specified in the mask. So there is no need to reserve the vector in the unused cluster members. Modify __assign_irq_vector() to reserve the vectors based on the user specified irq destination mask. If the new mask is a proper subset of the currently used mask, cleanup the vector allocation on the unused cpu members. Also, allow the apic driver to tune the vector domain based on the affinity mask (which in most cases is the user-specified mask). Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Acked-by: Yinghai Lu <yinghai@kernel.org> Acked-by: Alexander Gordeev <agordeev@redhat.com> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Link: http://lkml.kernel.org/r/1340656709-11423-3-git-send-email-suresh.b.siddha@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/vsmp_64.c')
-rw-r--r--arch/x86/kernel/vsmp_64.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/vsmp_64.c b/arch/x86/kernel/vsmp_64.c
index 3f0285ac00f..992f890283e 100644
--- a/arch/x86/kernel/vsmp_64.c
+++ b/arch/x86/kernel/vsmp_64.c
@@ -208,7 +208,8 @@ static int apicid_phys_pkg_id(int initial_apic_id, int index_msb)
* In vSMP, all cpus should be capable of handling interrupts, regardless of
* the APIC used.
*/
-static void fill_vector_allocation_domain(int cpu, struct cpumask *retmask)
+static void fill_vector_allocation_domain(int cpu, struct cpumask *retmask,
+ const struct cpumask *mask)
{
cpumask_setall(retmask);
}