Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

[pandora-kernel.git] / arch / x86 / kernel / apic / x2apic_uv_x.c

diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c
index 194539a..c1c52c3 100644 (file)
--- a/arch/x86/kernel/apic/x2apic_uv_x.c
+++ b/arch/x86/kernel/apic/x2apic_uv_x.c
@@ -44,6 +44,8 @@ static u64 gru_start_paddr, gru_end_paddr;
 static union uvh_apicid uvh_apicid;
 int uv_min_hub_revision_id;
 EXPORT_SYMBOL_GPL(uv_min_hub_revision_id);
+unsigned int uv_apicid_hibits;
+EXPORT_SYMBOL_GPL(uv_apicid_hibits);
 static DEFINE_SPINLOCK(uv_nmi_lock);
 
 static inline bool is_GRU_range(u64 start, u64 end)
@@ -85,6 +87,23 @@ static void __init early_get_apic_pnode_shift(void)
                uvh_apicid.s.pnode_shift = UV_APIC_PNODE_SHIFT;
 }
 
+/*
+ * Add an extra bit as dictated by bios to the destination apicid of
+ * interrupts potentially passing through the UV HUB.  This prevents
+ * a deadlock between interrupts and IO port operations.
+ */
+static void __init uv_set_apicid_hibit(void)
+{
+       union uvh_lb_target_physical_apic_id_mask_u apicid_mask;
+       unsigned long *mmr;
+
+       mmr = early_ioremap(UV_LOCAL_MMR_BASE |
+               UVH_LB_TARGET_PHYSICAL_APIC_ID_MASK, sizeof(*mmr));
+       apicid_mask.v = *mmr;
+       early_iounmap(mmr, sizeof(*mmr));
+       uv_apicid_hibits = apicid_mask.s.bit_enables & UV_APICID_HIBIT_MASK;
+}
+
 static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
 {
        int nodeid;
@@ -102,6 +121,7 @@ static int __init uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
                        __get_cpu_var(x2apic_extra_bits) =
                                nodeid << (uvh_apicid.s.pnode_shift - 1);
                        uv_system_type = UV_NON_UNIQUE_APIC;
+                       uv_set_apicid_hibit();
                        return 1;
                }
        }
@@ -155,6 +175,7 @@ static int __cpuinit uv_wakeup_secondary(int phys_apicid, unsigned long start_ri
        int pnode;
 
        pnode = uv_apicid_to_pnode(phys_apicid);
+       phys_apicid |= uv_apicid_hibits;
        val = (1UL << UVH_IPI_INT_SEND_SHFT) |
            (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
            ((start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
@@ -236,7 +257,7 @@ static unsigned int uv_cpu_mask_to_apicid(const struct cpumask *cpumask)
        int cpu = cpumask_first(cpumask);
 
        if ((unsigned)cpu < nr_cpu_ids)
-               return per_cpu(x86_cpu_to_apicid, cpu);
+               return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
        else
                return BAD_APICID;
 }
@@ -255,7 +276,7 @@ uv_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
                if (cpumask_test_cpu(cpu, cpu_online_mask))
                        break;
        }
-       return per_cpu(x86_cpu_to_apicid, cpu);
+       return per_cpu(x86_cpu_to_apicid, cpu) | uv_apicid_hibits;
 }
 
 static unsigned int x2apic_get_apic_id(unsigned long x)