diff options
Diffstat (limited to 'arch/s390/kernel/early.c')
| -rw-r--r-- | arch/s390/kernel/early.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c index 1345ba452c83..f4bcdc01bfc8 100644 --- a/arch/s390/kernel/early.c +++ b/arch/s390/kernel/early.c @@ -215,26 +215,44 @@ static noinline __init void init_kernel_storage_key(void) PAGE_DEFAULT_KEY, 0); } -static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE); +static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE); static noinline __init void detect_machine_type(void) { + struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page; + /* Check current-configuration-level */ if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) { S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR; return; } /* Get virtual-machine cpu information. */ - if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !vmms.count) + if (stsi(vmms, 3, 2, 2) == -ENOSYS || !vmms->count) return; /* Running under KVM? If not we assume z/VM */ - if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3)) + if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3)) S390_lowcore.machine_flags |= MACHINE_FLAG_KVM; else S390_lowcore.machine_flags |= MACHINE_FLAG_VM; } +static __init void setup_topology(void) +{ +#ifdef CONFIG_64BIT + int max_mnest; + + if (!test_facility(11)) + return; + S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; + for (max_mnest = 6; max_mnest > 1; max_mnest--) { + if (stsi(&sysinfo_page, 15, 1, max_mnest) != -ENOSYS) + break; + } + topology_max_mnest = max_mnest; +#endif +} + static void early_pgm_check_handler(void) { unsigned long addr; @@ -364,8 +382,6 @@ static __init void detect_machine_facilities(void) S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE; if (test_facility(8)) S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF; - if (test_facility(11)) - S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY; if (test_facility(27)) S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS; if (test_facility(40)) @@ -467,6 +483,7 @@ void __init startup_init(void) detect_diag44(); detect_machine_facilities(); setup_hpage(); + setup_topology(); sclp_facilities_detect(); detect_memory_layout(memory_chunk); #ifdef CONFIG_DYNAMIC_FTRACE |