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s390/topology: delay initialization of topology cpu masks 

There is no reason to initialize the topology cpu masks already while
setup_arch() is being called. It is sufficient to initialize the masks
before the scheduler becomes SMP aware.
Therefore a pre-SMP initcall aka early_initcall is suffucient.

This also allows to convert the cpu_topology array into a per cpu
variable with a later patch. Without this patch this wouldn't be
possible since the per cpu memory areas are not allocated while setup_arch
is executed.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2015-02-04 14:21:31 +01:00 committed by Martin Schwidefsky
parent 49253925c0
commit d05d15da18
3 changed files with 47 additions and 62 deletions
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8
arch/s390/include/asm/topology.h
View File

@ -51,14 +51,6 @@ static inline void topology_expect_change(void) { }
#define POLARIZATION_VM (2)
#define POLARIZATION_VH (3)
#ifdef CONFIG_SCHED_BOOK
void s390_init_cpu_topology(void);
#else
static inline void s390_init_cpu_topology(void)
{
};
#endif
#include <asm-generic/topology.h>
#endif /* _ASM_S390_TOPOLOGY_H */

1
arch/s390/kernel/setup.c
View File

@ -909,7 +909,6 @@ void __init setup_arch(char **cmdline_p)
setup_lowcore();
smp_fill_possible_mask();
cpu_init();
s390_init_cpu_topology();
/*
* Setup capabilities (ELF_HWCAP & ELF_PLATFORM).

100
arch/s390/kernel/topology.c
View File

@ -7,14 +7,14 @@
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/workqueue.h>
#include <linux/bootmem.h>
#include <linux/cpuset.h>
#include <linux/device.h>
#include <linux/export.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/mm.h>
@ -334,50 +334,6 @@ void topology_expect_change(void)
set_topology_timer();
}
static int __init early_parse_topology(char *p)
{
if (strncmp(p, "off", 3))
return 0;
topology_enabled = 0;
return 0;
}
early_param("topology", early_parse_topology);
static void __init alloc_masks(struct sysinfo_15_1_x *info,
struct mask_info *mask, int offset)
{
int i, nr_masks;
nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
for (i = 0; i < info->mnest - offset; i++)
nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
nr_masks = max(nr_masks, 1);
for (i = 0; i < nr_masks; i++) {
mask->next = alloc_bootmem_align(
roundup_pow_of_two(sizeof(struct mask_info)),
roundup_pow_of_two(sizeof(struct mask_info)));
mask = mask->next;
}
}
void __init s390_init_cpu_topology(void)
{
struct sysinfo_15_1_x *info;
int i;
if (!MACHINE_HAS_TOPOLOGY)
return;
tl_info = alloc_bootmem_pages(PAGE_SIZE);
info = tl_info;
store_topology(info);
pr_info("The CPU configuration topology of the machine is:");
for (i = 0; i < TOPOLOGY_NR_MAG; i++)
printk(KERN_CONT " %d", info->mag[i]);
printk(KERN_CONT " / %d\n", info->mnest);
alloc_masks(info, &socket_info, 1);
alloc_masks(info, &book_info, 2);
}
static int cpu_management;
static ssize_t dispatching_show(struct device *dev,
@ -481,6 +437,15 @@ static const struct cpumask *cpu_book_mask(int cpu)
return &cpu_topology[cpu].book_mask;
}
static int __init early_parse_topology(char *p)
{
if (strncmp(p, "off", 3))
return 0;
topology_enabled = 0;
return 0;
}
early_param("topology", early_parse_topology);
static struct sched_domain_topology_level s390_topology[] = {
{ cpu_thread_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
@ -489,6 +454,42 @@ static struct sched_domain_topology_level s390_topology[] = {
{ NULL, },
};
static void __init alloc_masks(struct sysinfo_15_1_x *info,
struct mask_info *mask, int offset)
{
int i, nr_masks;
nr_masks = info->mag[TOPOLOGY_NR_MAG - offset];
for (i = 0; i < info->mnest - offset; i++)
nr_masks *= info->mag[TOPOLOGY_NR_MAG - offset - 1 - i];
nr_masks = max(nr_masks, 1);
for (i = 0; i < nr_masks; i++) {
mask->next = kzalloc(sizeof(*mask->next), GFP_KERNEL);
mask = mask->next;
}
}
static int __init s390_topology_init(void)
{
struct sysinfo_15_1_x *info;
int i;
if (!MACHINE_HAS_TOPOLOGY)
return 0;
tl_info = (struct sysinfo_15_1_x *)__get_free_page(GFP_KERNEL);
info = tl_info;
store_topology(info);
pr_info("The CPU configuration topology of the machine is:");
for (i = 0; i < TOPOLOGY_NR_MAG; i++)
printk(KERN_CONT " %d", info->mag[i]);
printk(KERN_CONT " / %d\n", info->mnest);
alloc_masks(info, &socket_info, 1);
alloc_masks(info, &book_info, 2);
set_sched_topology(s390_topology);
return 0;
}
early_initcall(s390_topology_init);
static int __init topology_init(void)
{
if (MACHINE_HAS_TOPOLOGY)
@ -498,10 +499,3 @@ static int __init topology_init(void)
return device_create_file(cpu_subsys.dev_root, &dev_attr_dispatching);
}
device_initcall(topology_init);
static int __init early_topology_init(void)
{
set_sched_topology(s390_topology);
return 0;
}
early_initcall(early_topology_init);