diff options
Diffstat (limited to 'arch/x86/kernel/smpboot.c')
| -rw-r--r-- | arch/x86/kernel/smpboot.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index 24d57f77b3c1..3bf1e0b5f827 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -97,6 +97,14 @@ DEFINE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map); DEFINE_PER_CPU_READ_MOSTLY(struct cpuinfo_x86, cpu_info); EXPORT_PER_CPU_SYMBOL(cpu_info); +/* Logical package management. We might want to allocate that dynamically */ +static int *physical_to_logical_pkg __read_mostly; +static unsigned long *physical_package_map __read_mostly;; +static unsigned long *logical_package_map __read_mostly; +static unsigned int max_physical_pkg_id __read_mostly; +unsigned int __max_logical_packages __read_mostly; +EXPORT_SYMBOL(__max_logical_packages); + static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip) { unsigned long flags; @@ -251,6 +259,97 @@ static void notrace start_secondary(void *unused) cpu_startup_entry(CPUHP_ONLINE); } +int topology_update_package_map(unsigned int apicid, unsigned int cpu) +{ + unsigned int new, pkg = apicid >> boot_cpu_data.x86_coreid_bits; + + /* Called from early boot ? */ + if (!physical_package_map) + return 0; + + if (pkg >= max_physical_pkg_id) + return -EINVAL; + + /* Set the logical package id */ + if (test_and_set_bit(pkg, physical_package_map)) + goto found; + + if (pkg < __max_logical_packages) { + set_bit(pkg, logical_package_map); + physical_to_logical_pkg[pkg] = pkg; + goto found; + } + new = find_first_zero_bit(logical_package_map, __max_logical_packages); + if (new >= __max_logical_packages) { + physical_to_logical_pkg[pkg] = -1; + pr_warn("APIC(%x) Package %u exceeds logical package map\n", + apicid, pkg); + return -ENOSPC; + } + set_bit(new, logical_package_map); + pr_info("APIC(%x) Converting physical %u to logical package %u\n", + apicid, pkg, new); + physical_to_logical_pkg[pkg] = new; + +found: + cpu_data(cpu).logical_proc_id = physical_to_logical_pkg[pkg]; + return 0; +} + +/** + * topology_phys_to_logical_pkg - Map a physical package id to a logical + * + * Returns logical package id or -1 if not found + */ +int topology_phys_to_logical_pkg(unsigned int phys_pkg) +{ + if (phys_pkg >= max_physical_pkg_id) + return -1; + return physical_to_logical_pkg[phys_pkg]; +} +EXPORT_SYMBOL(topology_phys_to_logical_pkg); + +static void __init smp_init_package_map(void) +{ + unsigned int ncpus, cpu; + size_t size; + + /* + * Today neither Intel nor AMD support heterogenous systems. That + * might change in the future.... + */ + ncpus = boot_cpu_data.x86_max_cores * smp_num_siblings; + __max_logical_packages = DIV_ROUND_UP(nr_cpu_ids, ncpus); + + /* + * Possibly larger than what we need as the number of apic ids per + * package can be smaller than the actual used apic ids. + */ + max_physical_pkg_id = DIV_ROUND_UP(MAX_LOCAL_APIC, ncpus); + size = max_physical_pkg_id * sizeof(unsigned int); + physical_to_logical_pkg = kmalloc(size, GFP_KERNEL); + memset(physical_to_logical_pkg, 0xff, size); + size = BITS_TO_LONGS(max_physical_pkg_id) * sizeof(unsigned long); + physical_package_map = kzalloc(size, GFP_KERNEL); + size = BITS_TO_LONGS(__max_logical_packages) * sizeof(unsigned long); + logical_package_map = kzalloc(size, GFP_KERNEL); + + pr_info("Max logical packages: %u\n", __max_logical_packages); + + for_each_present_cpu(cpu) { + unsigned int apicid = apic->cpu_present_to_apicid(cpu); + + if (apicid == BAD_APICID || !apic->apic_id_valid(apicid)) + continue; + if (!topology_update_package_map(apicid, cpu)) + continue; + pr_warn("CPU %u APICId %x disabled\n", cpu, apicid); + per_cpu(x86_bios_cpu_apicid, cpu) = BAD_APICID; + set_cpu_possible(cpu, false); + set_cpu_present(cpu, false); + } +} + void __init smp_store_boot_cpu_info(void) { int id = 0; /* CPU 0 */ @@ -258,6 +357,7 @@ void __init smp_store_boot_cpu_info(void) *c = boot_cpu_data; c->cpu_index = id; + smp_init_package_map(); } /* |