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linux-next/arch/ia64/kernel/topology.c
Rafael J. Wysocki 8bb7844286 Add suspend-related notifications for CPU hotplug
Since nonboot CPUs are now disabled after tasks and devices have been
frozen and the CPU hotplug infrastructure is used for this purpose, we need
special CPU hotplug notifications that will help the CPU-hotplug-aware
subsystems distinguish normal CPU hotplug events from CPU hotplug events
related to a system-wide suspend or resume operation in progress.  This
patch introduces such notifications and causes them to be used during
suspend and resume transitions.  It also changes all of the
CPU-hotplug-aware subsystems to take these notifications into consideration
(for now they are handled in the same way as the corresponding "normal"
ones).

[oleg@tv-sign.ru: cleanups]
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Gautham R Shenoy <ego@in.ibm.com>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-09 12:30:56 -07:00

447 lines
10 KiB
C

/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* This file contains NUMA specific variables and functions which can
* be split away from DISCONTIGMEM and are used on NUMA machines with
* contiguous memory.
* 2002/08/07 Erich Focht <efocht@ess.nec.de>
* Populate cpu entries in sysfs for non-numa systems as well
* Intel Corporation - Ashok Raj
* 02/27/2006 Zhang, Yanmin
* Populate cpu cache entries in sysfs for cpu cache info
*/
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/node.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/nodemask.h>
#include <linux/notifier.h>
#include <asm/mmzone.h>
#include <asm/numa.h>
#include <asm/cpu.h>
static struct ia64_cpu *sysfs_cpus;
int arch_register_cpu(int num)
{
#if defined (CONFIG_ACPI) && defined (CONFIG_HOTPLUG_CPU)
/*
* If CPEI can be re-targetted or if this is not
* CPEI target, then it is hotpluggable
*/
if (can_cpei_retarget() || !is_cpu_cpei_target(num))
sysfs_cpus[num].cpu.hotpluggable = 1;
map_cpu_to_node(num, node_cpuid[num].nid);
#endif
return register_cpu(&sysfs_cpus[num].cpu, num);
}
#ifdef CONFIG_HOTPLUG_CPU
void arch_unregister_cpu(int num)
{
unregister_cpu(&sysfs_cpus[num].cpu);
unmap_cpu_from_node(num, cpu_to_node(num));
}
EXPORT_SYMBOL(arch_register_cpu);
EXPORT_SYMBOL(arch_unregister_cpu);
#endif /*CONFIG_HOTPLUG_CPU*/
static int __init topology_init(void)
{
int i, err = 0;
#ifdef CONFIG_NUMA
/*
* MCD - Do we want to register all ONLINE nodes, or all POSSIBLE nodes?
*/
for_each_online_node(i) {
if ((err = register_one_node(i)))
goto out;
}
#endif
sysfs_cpus = kzalloc(sizeof(struct ia64_cpu) * NR_CPUS, GFP_KERNEL);
if (!sysfs_cpus)
panic("kzalloc in topology_init failed - NR_CPUS too big?");
for_each_present_cpu(i) {
if((err = arch_register_cpu(i)))
goto out;
}
out:
return err;
}
subsys_initcall(topology_init);
/*
* Export cpu cache information through sysfs
*/
/*
* A bunch of string array to get pretty printing
*/
static const char *cache_types[] = {
"", /* not used */
"Instruction",
"Data",
"Unified" /* unified */
};
static const char *cache_mattrib[]={
"WriteThrough",
"WriteBack",
"", /* reserved */
"" /* reserved */
};
struct cache_info {
pal_cache_config_info_t cci;
cpumask_t shared_cpu_map;
int level;
int type;
struct kobject kobj;
};
struct cpu_cache_info {
struct cache_info *cache_leaves;
int num_cache_leaves;
struct kobject kobj;
};
static struct cpu_cache_info all_cpu_cache_info[NR_CPUS];
#define LEAF_KOBJECT_PTR(x,y) (&all_cpu_cache_info[x].cache_leaves[y])
#ifdef CONFIG_SMP
static void cache_shared_cpu_map_setup( unsigned int cpu,
struct cache_info * this_leaf)
{
pal_cache_shared_info_t csi;
int num_shared, i = 0;
unsigned int j;
if (cpu_data(cpu)->threads_per_core <= 1 &&
cpu_data(cpu)->cores_per_socket <= 1) {
cpu_set(cpu, this_leaf->shared_cpu_map);
return;
}
if (ia64_pal_cache_shared_info(this_leaf->level,
this_leaf->type,
0,
&csi) != PAL_STATUS_SUCCESS)
return;
num_shared = (int) csi.num_shared;
do {
for_each_possible_cpu(j)
if (cpu_data(cpu)->socket_id == cpu_data(j)->socket_id
&& cpu_data(j)->core_id == csi.log1_cid
&& cpu_data(j)->thread_id == csi.log1_tid)
cpu_set(j, this_leaf->shared_cpu_map);
i++;
} while (i < num_shared &&
ia64_pal_cache_shared_info(this_leaf->level,
this_leaf->type,
i,
&csi) == PAL_STATUS_SUCCESS);
}
#else
static void cache_shared_cpu_map_setup(unsigned int cpu,
struct cache_info * this_leaf)
{
cpu_set(cpu, this_leaf->shared_cpu_map);
return;
}
#endif
static ssize_t show_coherency_line_size(struct cache_info *this_leaf,
char *buf)
{
return sprintf(buf, "%u\n", 1 << this_leaf->cci.pcci_line_size);
}
static ssize_t show_ways_of_associativity(struct cache_info *this_leaf,
char *buf)
{
return sprintf(buf, "%u\n", this_leaf->cci.pcci_assoc);
}
static ssize_t show_attributes(struct cache_info *this_leaf, char *buf)
{
return sprintf(buf,
"%s\n",
cache_mattrib[this_leaf->cci.pcci_cache_attr]);
}
static ssize_t show_size(struct cache_info *this_leaf, char *buf)
{
return sprintf(buf, "%uK\n", this_leaf->cci.pcci_cache_size / 1024);
}
static ssize_t show_number_of_sets(struct cache_info *this_leaf, char *buf)
{
unsigned number_of_sets = this_leaf->cci.pcci_cache_size;
number_of_sets /= this_leaf->cci.pcci_assoc;
number_of_sets /= 1 << this_leaf->cci.pcci_line_size;
return sprintf(buf, "%u\n", number_of_sets);
}
static ssize_t show_shared_cpu_map(struct cache_info *this_leaf, char *buf)
{
ssize_t len;
cpumask_t shared_cpu_map;
cpus_and(shared_cpu_map, this_leaf->shared_cpu_map, cpu_online_map);
len = cpumask_scnprintf(buf, NR_CPUS+1, shared_cpu_map);
len += sprintf(buf+len, "\n");
return len;
}
static ssize_t show_type(struct cache_info *this_leaf, char *buf)
{
int type = this_leaf->type + this_leaf->cci.pcci_unified;
return sprintf(buf, "%s\n", cache_types[type]);
}
static ssize_t show_level(struct cache_info *this_leaf, char *buf)
{
return sprintf(buf, "%u\n", this_leaf->level);
}
struct cache_attr {
struct attribute attr;
ssize_t (*show)(struct cache_info *, char *);
ssize_t (*store)(struct cache_info *, const char *, size_t count);
};
#ifdef define_one_ro
#undef define_one_ro
#endif
#define define_one_ro(_name) \
static struct cache_attr _name = \
__ATTR(_name, 0444, show_##_name, NULL)
define_one_ro(level);
define_one_ro(type);
define_one_ro(coherency_line_size);
define_one_ro(ways_of_associativity);
define_one_ro(size);
define_one_ro(number_of_sets);
define_one_ro(shared_cpu_map);
define_one_ro(attributes);
static struct attribute * cache_default_attrs[] = {
&type.attr,
&level.attr,
&coherency_line_size.attr,
&ways_of_associativity.attr,
&attributes.attr,
&size.attr,
&number_of_sets.attr,
&shared_cpu_map.attr,
NULL
};
#define to_object(k) container_of(k, struct cache_info, kobj)
#define to_attr(a) container_of(a, struct cache_attr, attr)
static ssize_t cache_show(struct kobject * kobj, struct attribute * attr, char * buf)
{
struct cache_attr *fattr = to_attr(attr);
struct cache_info *this_leaf = to_object(kobj);
ssize_t ret;
ret = fattr->show ? fattr->show(this_leaf, buf) : 0;
return ret;
}
static struct sysfs_ops cache_sysfs_ops = {
.show = cache_show
};
static struct kobj_type cache_ktype = {
.sysfs_ops = &cache_sysfs_ops,
.default_attrs = cache_default_attrs,
};
static struct kobj_type cache_ktype_percpu_entry = {
.sysfs_ops = &cache_sysfs_ops,
};
static void __cpuinit cpu_cache_sysfs_exit(unsigned int cpu)
{
kfree(all_cpu_cache_info[cpu].cache_leaves);
all_cpu_cache_info[cpu].cache_leaves = NULL;
all_cpu_cache_info[cpu].num_cache_leaves = 0;
memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
return;
}
static int __cpuinit cpu_cache_sysfs_init(unsigned int cpu)
{
u64 i, levels, unique_caches;
pal_cache_config_info_t cci;
int j;
s64 status;
struct cache_info *this_cache;
int num_cache_leaves = 0;
if ((status = ia64_pal_cache_summary(&levels, &unique_caches)) != 0) {
printk(KERN_ERR "ia64_pal_cache_summary=%ld\n", status);
return -1;
}
this_cache=kzalloc(sizeof(struct cache_info)*unique_caches,
GFP_KERNEL);
if (this_cache == NULL)
return -ENOMEM;
for (i=0; i < levels; i++) {
for (j=2; j >0 ; j--) {
if ((status=ia64_pal_cache_config_info(i,j, &cci)) !=
PAL_STATUS_SUCCESS)
continue;
this_cache[num_cache_leaves].cci = cci;
this_cache[num_cache_leaves].level = i + 1;
this_cache[num_cache_leaves].type = j;
cache_shared_cpu_map_setup(cpu,
&this_cache[num_cache_leaves]);
num_cache_leaves ++;
}
}
all_cpu_cache_info[cpu].cache_leaves = this_cache;
all_cpu_cache_info[cpu].num_cache_leaves = num_cache_leaves;
memset(&all_cpu_cache_info[cpu].kobj, 0, sizeof(struct kobject));
return 0;
}
/* Add cache interface for CPU device */
static int __cpuinit cache_add_dev(struct sys_device * sys_dev)
{
unsigned int cpu = sys_dev->id;
unsigned long i, j;
struct cache_info *this_object;
int retval = 0;
cpumask_t oldmask;
if (all_cpu_cache_info[cpu].kobj.parent)
return 0;
oldmask = current->cpus_allowed;
retval = set_cpus_allowed(current, cpumask_of_cpu(cpu));
if (unlikely(retval))
return retval;
retval = cpu_cache_sysfs_init(cpu);
set_cpus_allowed(current, oldmask);
if (unlikely(retval < 0))
return retval;
all_cpu_cache_info[cpu].kobj.parent = &sys_dev->kobj;
kobject_set_name(&all_cpu_cache_info[cpu].kobj, "%s", "cache");
all_cpu_cache_info[cpu].kobj.ktype = &cache_ktype_percpu_entry;
retval = kobject_register(&all_cpu_cache_info[cpu].kobj);
for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++) {
this_object = LEAF_KOBJECT_PTR(cpu,i);
this_object->kobj.parent = &all_cpu_cache_info[cpu].kobj;
kobject_set_name(&(this_object->kobj), "index%1lu", i);
this_object->kobj.ktype = &cache_ktype;
retval = kobject_register(&(this_object->kobj));
if (unlikely(retval)) {
for (j = 0; j < i; j++) {
kobject_unregister(
&(LEAF_KOBJECT_PTR(cpu,j)->kobj));
}
kobject_unregister(&all_cpu_cache_info[cpu].kobj);
cpu_cache_sysfs_exit(cpu);
break;
}
}
return retval;
}
/* Remove cache interface for CPU device */
static int __cpuinit cache_remove_dev(struct sys_device * sys_dev)
{
unsigned int cpu = sys_dev->id;
unsigned long i;
for (i = 0; i < all_cpu_cache_info[cpu].num_cache_leaves; i++)
kobject_unregister(&(LEAF_KOBJECT_PTR(cpu,i)->kobj));
if (all_cpu_cache_info[cpu].kobj.parent) {
kobject_unregister(&all_cpu_cache_info[cpu].kobj);
memset(&all_cpu_cache_info[cpu].kobj,
0,
sizeof(struct kobject));
}
cpu_cache_sysfs_exit(cpu);
return 0;
}
/*
* When a cpu is hot-plugged, do a check and initiate
* cache kobject if necessary
*/
static int __cpuinit cache_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
struct sys_device *sys_dev;
sys_dev = get_cpu_sysdev(cpu);
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
cache_add_dev(sys_dev);
break;
case CPU_DEAD:
case CPU_DEAD_FROZEN:
cache_remove_dev(sys_dev);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __cpuinitdata cache_cpu_notifier =
{
.notifier_call = cache_cpu_callback
};
static int __cpuinit cache_sysfs_init(void)
{
int i;
for_each_online_cpu(i) {
cache_cpu_callback(&cache_cpu_notifier, CPU_ONLINE,
(void *)(long)i);
}
register_hotcpu_notifier(&cache_cpu_notifier);
return 0;
}
device_initcall(cache_sysfs_init);