1 files changed, 49 insertions, 19 deletions

diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c
index d071abe78ab1..b5b2b1103de8 100644
--- a/arch/powerpc/platforms/pseries/xics.c
+++ b/arch/powerpc/platforms/pseries/xics.c
@@ -656,13 +656,38 @@ static void __init xics_setup_8259_cascade(void)
         set_irq_chained_handler(cascade, pseries_8259_cascade);
 }
 
+static struct device_node *cpuid_to_of_node(int cpu)
+{
+        struct device_node *np;
+        u32 hcpuid = get_hard_smp_processor_id(cpu);
+
+        for_each_node_by_type(np, "cpu") {
+                int i, len;
+                const u32 *intserv;
+
+                intserv = get_property(np, "ibm,ppc-interrupt-server#s", &len);
+
+                if (!intserv)
+                        intserv = get_property(np, "reg", &len);
+
+                i = len / sizeof(u32);
+
+                while (i--)
+                        if (intserv[i] == hcpuid)
+                                return np;
+        }
+
+        return NULL;
+}
+
 void __init xics_init_IRQ(void)
 {
-        int i;
+        int i, j;
         struct device_node *np;
         u32 ilen, indx = 0;
-        const u32 *ireg;
+        const u32 *ireg, *isize;
         int found = 0;
+        u32 hcpuid;
 
         ppc64_boot_msg(0x20, "XICS Init");
 
@@ -683,26 +708,31 @@ void __init xics_init_IRQ(void)
         xics_init_host();
 
         /* Find the server numbers for the boot cpu. */
-        for (np = of_find_node_by_type(NULL, "cpu");
-             np;
-             np = of_find_node_by_type(np, "cpu")) {
-                ireg = get_property(np, "reg", &ilen);
-                if (ireg && ireg[0] == get_hard_smp_processor_id(boot_cpuid)) {
-                        ireg = get_property(np,
-                                        "ibm,ppc-interrupt-gserver#s", &ilen);
-                        i = ilen / sizeof(int);
-                        if (ireg && i > 0) {
-                                default_server = ireg[0];
-                                /* take last element */
-                                default_distrib_server = ireg[i-1];
-                        }
-                        ireg = get_property(np,
+        np = cpuid_to_of_node(boot_cpuid);
+        BUG_ON(!np);
+        ireg = get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen);
+        if (!ireg)
+                goto skip_gserver_check;
+        i = ilen / sizeof(int);
+        hcpuid = get_hard_smp_processor_id(boot_cpuid);
+
+        /* Global interrupt distribution server is specified in the last
+         * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last
+         * entry fom this property for current boot cpu id and use it as
+         * default distribution server
+         */
+        for (j = 0; j < i; j += 2) {
+                if (ireg[j] == hcpuid) {
+                        default_server = hcpuid;
+                        default_distrib_server = ireg[j+1];
+
+                        isize = get_property(np,
                                         "ibm,interrupt-server#-size", NULL);
-                        if (ireg)
-                                interrupt_server_size = *ireg;
-                        break;
+                        if (isize)
+                                interrupt_server_size = *isize;
                 }
         }
+skip_gserver_check:
         of_node_put(np);
 
         if (firmware_has_feature(FW_FEATURE_LPAR))