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authorSuresh Siddha <suresh.b.siddha@intel.com>2005-04-25 13:25:06 -0700
committerTony Luck <tony.luck@intel.com>2005-04-25 13:25:06 -0700
commite927ecb05e1ce4bbb1e10f57008c94994e2160f5 (patch)
treebc8256cc074f02d557088696035982fa7ae0b301 /arch
parent6118ec847e8e35393efc0f88394c2f5dd48c3313 (diff)
downloadop-kernel-dev-e927ecb05e1ce4bbb1e10f57008c94994e2160f5.zip
op-kernel-dev-e927ecb05e1ce4bbb1e10f57008c94994e2160f5.tar.gz
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/kernel/setup.c69
-rw-r--r--arch/ia64/kernel/smpboot.c206
2 files changed, 273 insertions, 2 deletions
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index f05650c..8804384 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;
diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index dbc6b61..0d5ee57 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -3,6 +3,11 @@
*
* Copyright (C) 1998-2003, 2005 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2001, 2004-2005 Intel Corp
+ * Rohit Seth <rohit.seth@intel.com>
+ * Suresh Siddha <suresh.b.siddha@intel.com>
+ * Gordon Jin <gordon.jin@intel.com>
+ * Ashok Raj <ashok.raj@intel.com>
*
* 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here.
* 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code.
@@ -10,6 +15,11 @@
* smp_boot_cpus()/smp_commence() is replaced by
* smp_prepare_cpus()/__cpu_up()/smp_cpus_done().
* 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support
+ * 04/12/26 Jin Gordon <gordon.jin@intel.com>
+ * 04/12/26 Rohit Seth <rohit.seth@intel.com>
+ * Add multi-threading and multi-core detection
+ * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com>
+ * Setup cpu_sibling_map and cpu_core_map
*/
#include <linux/config.h>
@@ -122,6 +132,11 @@ EXPORT_SYMBOL(cpu_online_map);
cpumask_t cpu_possible_map;
EXPORT_SYMBOL(cpu_possible_map);
+cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned;
+cpumask_t cpu_sibling_map[NR_CPUS] __cacheline_aligned;
+int smp_num_siblings = 1;
+int smp_num_cpucores = 1;
+
/* which logical CPU number maps to which CPU (physical APIC ID) */
volatile int ia64_cpu_to_sapicid[NR_CPUS];
EXPORT_SYMBOL(ia64_cpu_to_sapicid);
@@ -598,7 +613,68 @@ void __devinit smp_prepare_boot_cpu(void)
cpu_set(smp_processor_id(), cpu_callin_map);
}
+/*
+ * mt_info[] is a temporary store for all info returned by
+ * PAL_LOGICAL_TO_PHYSICAL, to be copied into cpuinfo_ia64 when the
+ * specific cpu comes.
+ */
+static struct {
+ __u32 socket_id;
+ __u16 core_id;
+ __u16 thread_id;
+ __u16 proc_fixed_addr;
+ __u8 valid;
+}mt_info[NR_CPUS] __devinit;
+
#ifdef CONFIG_HOTPLUG_CPU
+static inline void
+remove_from_mtinfo(int cpu)
+{
+ int i;
+
+ for_each_cpu(i)
+ if (mt_info[i].valid && mt_info[i].socket_id ==
+ cpu_data(cpu)->socket_id)
+ mt_info[i].valid = 0;
+}
+
+static inline void
+clear_cpu_sibling_map(int cpu)
+{
+ int i;
+
+ for_each_cpu_mask(i, cpu_sibling_map[cpu])
+ cpu_clear(cpu, cpu_sibling_map[i]);
+ for_each_cpu_mask(i, cpu_core_map[cpu])
+ cpu_clear(cpu, cpu_core_map[i]);
+
+ cpu_sibling_map[cpu] = cpu_core_map[cpu] = CPU_MASK_NONE;
+}
+
+static void
+remove_siblinginfo(int cpu)
+{
+ int last = 0;
+
+ if (cpu_data(cpu)->threads_per_core == 1 &&
+ cpu_data(cpu)->cores_per_socket == 1) {
+ cpu_clear(cpu, cpu_core_map[cpu]);
+ cpu_clear(cpu, cpu_sibling_map[cpu]);
+ return;
+ }
+
+ last = (cpus_weight(cpu_core_map[cpu]) == 1 ? 1 : 0);
+
+ /* remove it from all sibling map's */
+ clear_cpu_sibling_map(cpu);
+
+ /* if this cpu is the last in the core group, remove all its info
+ * from mt_info structure
+ */
+ if (last)
+ remove_from_mtinfo(cpu);
+}
+
extern void fixup_irqs(void);
/* must be called with cpucontrol mutex held */
int __cpu_disable(void)
@@ -611,6 +687,7 @@ int __cpu_disable(void)
if (cpu == 0)
return -EBUSY;
+ remove_siblinginfo(cpu);
fixup_irqs();
local_flush_tlb_all();
cpu_clear(cpu, cpu_callin_map);
@@ -663,6 +740,23 @@ smp_cpus_done (unsigned int dummy)
(int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100);
}
+static inline void __devinit
+set_cpu_sibling_map(int cpu)
+{
+ int i;
+
+ for_each_online_cpu(i) {
+ if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) {
+ cpu_set(i, cpu_core_map[cpu]);
+ cpu_set(cpu, cpu_core_map[i]);
+ if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) {
+ cpu_set(i, cpu_sibling_map[cpu]);
+ cpu_set(cpu, cpu_sibling_map[i]);
+ }
+ }
+ }
+}
+
int __devinit
__cpu_up (unsigned int cpu)
{
@@ -685,6 +779,15 @@ __cpu_up (unsigned int cpu)
if (ret < 0)
return ret;
+ if (cpu_data(cpu)->threads_per_core == 1 &&
+ cpu_data(cpu)->cores_per_socket == 1) {
+ cpu_set(cpu, cpu_sibling_map[cpu]);
+ cpu_set(cpu, cpu_core_map[cpu]);
+ return 0;
+ }
+
+ set_cpu_sibling_map(cpu);
+
return 0;
}
@@ -712,3 +815,106 @@ init_smp_config(void)
ia64_sal_strerror(sal_ret));
}
+static inline int __devinit
+check_for_mtinfo_index(void)
+{
+ int i;
+
+ for_each_cpu(i)
+ if (!mt_info[i].valid)
+ return i;
+
+ return -1;
+}
+
+/*
+ * Search the mt_info to find out if this socket's cid/tid information is
+ * cached or not. If the socket exists, fill in the core_id and thread_id
+ * in cpuinfo
+ */
+static int __devinit
+check_for_new_socket(__u16 logical_address, struct cpuinfo_ia64 *c)
+{
+ int i;
+ __u32 sid = c->socket_id;
+
+ for_each_cpu(i) {
+ if (mt_info[i].valid && mt_info[i].proc_fixed_addr == logical_address
+ && mt_info[i].socket_id == sid) {
+ c->core_id = mt_info[i].core_id;
+ c->thread_id = mt_info[i].thread_id;
+ return 1; /* not a new socket */
+ }
+ }
+ return 0;
+}
+
+/*
+ * identify_siblings(cpu) gets called from identify_cpu. This populates the
+ * information related to logical execution units in per_cpu_data structure.
+ */
+void __devinit
+identify_siblings(struct cpuinfo_ia64 *c)
+{
+ s64 status;
+ u16 pltid;
+ u64 proc_fixed_addr;
+ int count, i;
+ pal_logical_to_physical_t info;
+
+ if (smp_num_cpucores == 1 && smp_num_siblings == 1)
+ return;
+
+ if ((status = ia64_pal_logical_to_phys(0, &info)) != PAL_STATUS_SUCCESS) {
+ printk(KERN_ERR "ia64_pal_logical_to_phys failed with %ld\n",
+ status);
+ return;
+ }
+ if ((status = ia64_sal_physical_id_info(&pltid)) != PAL_STATUS_SUCCESS) {
+ printk(KERN_ERR "ia64_sal_pltid failed with %ld\n", status);
+ return;
+ }
+ if ((status = ia64_pal_fixed_addr(&proc_fixed_addr)) != PAL_STATUS_SUCCESS) {
+ printk(KERN_ERR "ia64_pal_fixed_addr failed with %ld\n", status);
+ return;
+ }
+
+ c->socket_id = (pltid << 8) | info.overview_ppid;
+ c->cores_per_socket = info.overview_cpp;
+ c->threads_per_core = info.overview_tpc;
+ count = c->num_log = info.overview_num_log;
+
+ /* If the thread and core id information is already cached, then
+ * we will simply update cpu_info and return. Otherwise, we will
+ * do the PAL calls and cache core and thread id's of all the siblings.
+ */
+ if (check_for_new_socket(proc_fixed_addr, c))
+ return;
+
+ for (i = 0; i < count; i++) {
+ int index;
+
+ if (i && (status = ia64_pal_logical_to_phys(i, &info))
+ != PAL_STATUS_SUCCESS) {
+ printk(KERN_ERR "ia64_pal_logical_to_phys failed"
+ " with %ld\n", status);
+ return;
+ }
+ if (info.log2_la == proc_fixed_addr) {
+ c->core_id = info.log1_cid;
+ c->thread_id = info.log1_tid;
+ }
+
+ index = check_for_mtinfo_index();
+ /* We will not do the mt_info caching optimization in this case.
+ */
+ if (index < 0)
+ continue;
+
+ mt_info[index].valid = 1;
+ mt_info[index].socket_id = c->socket_id;
+ mt_info[index].core_id = info.log1_cid;
+ mt_info[index].thread_id = info.log1_tid;
+ mt_info[index].proc_fixed_addr = info.log2_la;
+ }
+}
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