[IA64] multi-core/multi-thread identification

Version 3 - rediffed to apply on top of Ashok's hotplug cpu
patch.  /proc/cpuinfo output in step with x86.

This is an updated MC/MT identification patch based on the 
previous discussions on list. 

Add the Multi-core and Multi-threading detection for IPF.
  - Add new core and threading related fields in /proc/cpuinfo.
		Physical id
		Core id
		Thread id
		Siblings
  - setup the cpu_core_map and cpu_sibling_map appropriately
  - Handles Hot plug CPU
 
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Gordon Jin <gordon.jin@intel.com>
Signed-off-by: Rohit Seth <rohit.seth@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 67 insertions, 2 deletions

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index f05650c801d2..88043841fb8a 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -4,10 +4,15 @@
  * Copyright (C) 1998-2001, 2003-2004 Hewlett-Packard Co
  *      David Mosberger-Tang <davidm@hpl.hp.com>
  *      Stephane Eranian <eranian@hpl.hp.com>
- * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
+ * Copyright (C) 2000, 2004 Intel Corp
+ *      Rohit Seth <rohit.seth@intel.com>
+ *      Suresh Siddha <suresh.b.siddha@intel.com>
+ *      Gordon Jin <gordon.jin@intel.com>
  * Copyright (C) 1999 VA Linux Systems
  * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
  *
+ * 12/26/04 S.Siddha, G.Jin, R.Seth
+ *                      Add multi-threading and multi-core detection
  * 11/12/01 D.Mosberger Convert get_cpuinfo() to seq_file based show_cpuinfo().
  * 04/04/00 D.Mosberger renamed cpu_initialized to cpu_online_map
  * 03/31/00 R.Seth      cpu_initialized and current->processor fixes
@@ -296,6 +301,34 @@ mark_bsp_online (void)
 #endif
 }
 
+#ifdef CONFIG_SMP
+static void
+check_for_logical_procs (void)
+{
+        pal_logical_to_physical_t info;
+        s64 status;
+
+        status = ia64_pal_logical_to_phys(0, &info);
+        if (status == -1) {
+                printk(KERN_INFO "No logical to physical processor mapping "
+                       "available\n");
+                return;
+        }
+        if (status) {
+                printk(KERN_ERR "ia64_pal_logical_to_phys failed with %ld\n",
+                       status);
+                return;
+        }
+        /*
+         * Total number of siblings that BSP has.  Though not all of them 
+         * may have booted successfully. The correct number of siblings 
+         * booted is in info.overview_num_log.
+         */
+        smp_num_siblings = info.overview_tpc;
+        smp_num_cpucores = info.overview_cpp;
+}
+#endif
+
 void __init
 setup_arch (char **cmdline_p)
 {
@@ -356,6 +389,19 @@ setup_arch (char **cmdline_p)
 
 #ifdef CONFIG_SMP
         cpu_physical_id(0) = hard_smp_processor_id();
+
+        cpu_set(0, cpu_sibling_map[0]);
+        cpu_set(0, cpu_core_map[0]);
+
+        check_for_logical_procs();
+        if (smp_num_cpucores > 1)
+                printk(KERN_INFO
+                       "cpu package is Multi-Core capable: number of cores=%d\n",
+                       smp_num_cpucores);
+        if (smp_num_siblings > 1)
+                printk(KERN_INFO
+                       "cpu package is Multi-Threading capable: number of siblings=%d\n",
+                       smp_num_siblings);
 #endif
 
         cpu_init();     /* initialize the bootstrap CPU */
@@ -459,12 +505,23 @@ show_cpuinfo (struct seq_file *m, void *v)
                    "cpu regs   : %u\n"
                    "cpu MHz    : %lu.%06lu\n"
                    "itc MHz    : %lu.%06lu\n"
-                   "BogoMIPS   : %lu.%02lu\n\n",
+                   "BogoMIPS   : %lu.%02lu\n",
                    cpunum, c->vendor, family, c->model, c->revision, c->archrev,
                    features, c->ppn, c->number,
                    c->proc_freq / 1000000, c->proc_freq % 1000000,
                    c->itc_freq / 1000000, c->itc_freq % 1000000,
                    lpj*HZ/500000, (lpj*HZ/5000) % 100);
+#ifdef CONFIG_SMP
+        if (c->threads_per_core > 1 || c->cores_per_socket > 1)
+                seq_printf(m,
+                           "physical id: %u\n"
+                           "core id    : %u\n"
+                           "thread id  : %u\n",
+                           c->socket_id, c->core_id, c->thread_id);
+        seq_printf(m, "siblings   : %u\n", c->num_log);
+#endif
+        seq_printf(m,"\n");
+
         return 0;
 }
 
@@ -533,6 +590,14 @@ identify_cpu (struct cpuinfo_ia64 *c)
         memcpy(c->vendor, cpuid.field.vendor, 16);
 #ifdef CONFIG_SMP
         c->cpu = smp_processor_id();
+
+        /* below default values will be overwritten  by identify_siblings() 
+         * for Multi-Threading/Multi-Core capable cpu's
+         */
+        c->threads_per_core = c->cores_per_socket = c->num_log = 1;
+        c->socket_id = -1;
+
+        identify_siblings(c);
 #endif
         c->ppn = cpuid.field.ppn;
         c->number = cpuid.field.number;