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s390/smp: initialize cpu_present_mask in setup_arch

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In order to be able to setup the cpu to node mappings early it is a
prerequisite to know which cpus are present. Therefore cpus must be
detected much earlier than before.

For sclp based cpu detection this requires yet another early sclp
call, since the system is not ready to use the regular interrupt and
memory allocations.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
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
2016-12-03 09:48:01 +01:00
committed by Martin Schwidefsky
parent ebb299a510
commit af51160ebd
7 changed files with 76 additions and 38 deletions
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10
arch/s390/include/asm/sclp.h
View File

@@ -101,7 +101,8 @@ struct zpci_report_error_header {
u8 data[0]; /* Subsequent Data passed verbatim to SCLP ET 24 */
} __packed;
int sclp_get_core_info(struct sclp_core_info *info);
int _sclp_get_core_info_early(struct sclp_core_info *info);
int _sclp_get_core_info(struct sclp_core_info *info);
int sclp_core_configure(u8 core);
int sclp_core_deconfigure(u8 core);
int sclp_sdias_blk_count(void);
@@ -119,4 +120,11 @@ void sclp_early_detect(void);
void _sclp_print_early(const char *);
void sclp_ocf_cpc_name_copy(char *dst);
static inline int sclp_get_core_info(struct sclp_core_info *info, int early)
{
if (early)
return _sclp_get_core_info_early(info);
return _sclp_get_core_info(info);
}
#endif /* _ASM_S390_SCLP_H */

2
arch/s390/include/asm/smp.h
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@@ -36,6 +36,7 @@ extern void smp_yield_cpu(int cpu);
extern void smp_cpu_set_polarization(int cpu, int val);
extern int smp_cpu_get_polarization(int cpu);
extern void smp_fill_possible_mask(void);
extern void smp_detect_cpus(void);
#else /* CONFIG_SMP */
@@ -56,6 +57,7 @@ static inline int smp_store_status(int cpu) { return 0; }
static inline int smp_vcpu_scheduled(int cpu) { return 1; }
static inline void smp_yield_cpu(int cpu) { }
static inline void smp_fill_possible_mask(void) { }
static inline void smp_detect_cpus(void) { }
#endif /* CONFIG_SMP */

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

@@ -923,6 +923,7 @@ void __init setup_arch(char **cmdline_p)
cpu_detect_mhz_feature();
cpu_init();
numa_setup();
smp_detect_cpus();
/*
* Create kernel page tables and switch to virtual addressing.

22
arch/s390/kernel/smp.c
View File

@@ -19,6 +19,7 @@
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/workqueue.h>
#include <linux/bootmem.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/mm.h>
@@ -655,14 +656,12 @@ int smp_cpu_get_polarization(int cpu)
return pcpu_devices[cpu].polarization;
}
static struct sclp_core_info *smp_get_core_info(void)
static void __ref smp_get_core_info(struct sclp_core_info *info, int early)
{
static int use_sigp_detection;
struct sclp_core_info *info;
int address;
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (info && (use_sigp_detection || sclp_get_core_info(info))) {
if (use_sigp_detection || sclp_get_core_info(info, early)) {
use_sigp_detection = 1;
for (address = 0;
address < (SCLP_MAX_CORES << smp_cpu_mt_shift);
@@ -676,7 +675,6 @@ static struct sclp_core_info *smp_get_core_info(void)
}
info->combined = info->configured;
}
return info;
}
static int smp_add_present_cpu(int cpu);
@@ -717,17 +715,15 @@ static int __smp_rescan_cpus(struct sclp_core_info *info, int sysfs_add)
return nr;
}
static void __init smp_detect_cpus(void)
void __init smp_detect_cpus(void)
{
unsigned int cpu, mtid, c_cpus, s_cpus;
struct sclp_core_info *info;
u16 address;
/* Get CPU information */
info = smp_get_core_info();
if (!info)
panic("smp_detect_cpus failed to allocate memory\n");
info = memblock_virt_alloc(sizeof(*info), 8);
smp_get_core_info(info, 1);
/* Find boot CPU type */
if (sclp.has_core_type) {
address = stap();
@@ -763,7 +759,7 @@ static void __init smp_detect_cpus(void)
get_online_cpus();
__smp_rescan_cpus(info, 0);
put_online_cpus();
kfree(info);
memblock_free_early((unsigned long)info, sizeof(*info));
}
/*
@@ -900,7 +896,6 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
/* request the 0x1202 external call external interrupt */
if (register_external_irq(EXT_IRQ_EXTERNAL_CALL, do_ext_call_interrupt))
panic("Couldn't request external interrupt 0x1202");
smp_detect_cpus();
}
void __init smp_prepare_boot_cpu(void)
@@ -1111,9 +1106,10 @@ int __ref smp_rescan_cpus(void)
struct sclp_core_info *info;
int nr;
info = smp_get_core_info();
info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
smp_get_core_info(info, 0);
get_online_cpus();
mutex_lock(&smp_cpu_state_mutex);
nr = __smp_rescan_cpus(info, 1);