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Diffstat (limited to 'arch/x86_64/kernel/genapic_flat.c')
-rw-r--r--arch/x86_64/kernel/genapic_flat.c62
1 files changed, 61 insertions, 1 deletions
diff --git a/arch/x86_64/kernel/genapic_flat.c b/arch/x86_64/kernel/genapic_flat.c
index fdfa15f5d2e..adc96282a9e 100644
--- a/arch/x86_64/kernel/genapic_flat.c
+++ b/arch/x86_64/kernel/genapic_flat.c
@@ -2,7 +2,7 @@
* Copyright 2004 James Cleverdon, IBM.
* Subject to the GNU Public License, v.2
*
- * Flat APIC subarch code. Maximum 8 CPUs, logical delivery.
+ * Flat APIC subarch code.
*
* Hacked for x86-64 by James Cleverdon from i386 architecture code by
* Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
@@ -119,3 +119,63 @@ struct genapic apic_flat = {
.cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
.phys_pkg_id = phys_pkg_id,
};
+
+/*
+ * Physflat mode is used when there are more than 8 CPUs on a AMD system.
+ * We cannot use logical delivery in this case because the mask
+ * overflows, so use physical mode.
+ */
+
+static cpumask_t physflat_target_cpus(void)
+{
+ return cpumask_of_cpu(0);
+}
+
+static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
+{
+ send_IPI_mask_sequence(cpumask, vector);
+}
+
+static void physflat_send_IPI_allbutself(int vector)
+{
+ cpumask_t allbutme = cpu_online_map;
+ int me = get_cpu();
+ cpu_clear(me, allbutme);
+ physflat_send_IPI_mask(allbutme, vector);
+ put_cpu();
+}
+
+static void physflat_send_IPI_all(int vector)
+{
+ physflat_send_IPI_mask(cpu_online_map, vector);
+}
+
+static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
+{
+ int cpu;
+
+ /*
+ * We're using fixed IRQ delivery, can only return one phys APIC ID.
+ * May as well be the first.
+ */
+ cpu = first_cpu(cpumask);
+ if ((unsigned)cpu < NR_CPUS)
+ return x86_cpu_to_apicid[cpu];
+ else
+ return BAD_APICID;
+}
+
+struct genapic apic_physflat = {
+ .name = "physical flat",
+ .int_delivery_mode = dest_LowestPrio,
+ .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
+ .int_delivery_dest = APIC_DEST_PHYSICAL | APIC_DM_LOWEST,
+ .target_cpus = physflat_target_cpus,
+ .apic_id_registered = flat_apic_id_registered,
+ .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
+ .send_IPI_all = physflat_send_IPI_all,
+ .send_IPI_allbutself = physflat_send_IPI_allbutself,
+ .send_IPI_mask = physflat_send_IPI_mask,
+ .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
+ .phys_pkg_id = phys_pkg_id,
+};