projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 68a1c3f8 GC |
1 | #include <linux/init.h> |
| 2 | #include <linux/smp.h> | |
| a355352b | 3 | #include <linux/module.h> |
| 68a1c3f8 | 4 | |
| a355352b GC |
5 | /* Number of siblings per CPU package */ |
| 6 | int smp_num_siblings = 1; | |
| 7 | EXPORT_SYMBOL(smp_num_siblings); | |
| 8 | ||
| 9 | /* Last level cache ID of each logical CPU */ | |
| 10 | DEFINE_PER_CPU(u16, cpu_llc_id) = BAD_APICID; | |
| 11 | ||
| 12 | /* bitmap of online cpus */ | |
| 13 | cpumask_t cpu_online_map __read_mostly; | |
| 14 | EXPORT_SYMBOL(cpu_online_map); | |
| 15 | ||
| 16 | cpumask_t cpu_callin_map; | |
| 17 | cpumask_t cpu_callout_map; | |
| 18 | cpumask_t cpu_possible_map; | |
| 19 | EXPORT_SYMBOL(cpu_possible_map); | |
| 20 | ||
| 21 | /* representing HT siblings of each logical CPU */ | |
| 22 | DEFINE_PER_CPU(cpumask_t, cpu_sibling_map); | |
| 23 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); | |
| 24 | ||
| 25 | /* representing HT and core siblings of each logical CPU */ | |
| 26 | DEFINE_PER_CPU(cpumask_t, cpu_core_map); | |
| 27 | EXPORT_PER_CPU_SYMBOL(cpu_core_map); | |
| 28 | ||
| 29 | /* Per CPU bogomips and other parameters */ | |
| 30 | DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info); | |
| 31 | EXPORT_PER_CPU_SYMBOL(cpu_info); | |
| 68a1c3f8 GC |
32 | #ifdef CONFIG_HOTPLUG_CPU |
| 33 | ||
| 34 | int additional_cpus __initdata = -1; | |
| 35 | ||
| 36 | static __init int setup_additional_cpus(char *s) | |
| 37 | { | |
| 38 | return s && get_option(&s, &additional_cpus) ? 0 : -EINVAL; | |
| 39 | } | |
| 40 | early_param("additional_cpus", setup_additional_cpus); | |
| 41 | ||
| 42 | /* | |
| 43 | * cpu_possible_map should be static, it cannot change as cpu's | |
| 44 | * are onlined, or offlined. The reason is per-cpu data-structures | |
| 45 | * are allocated by some modules at init time, and dont expect to | |
| 46 | * do this dynamically on cpu arrival/departure. | |
| 47 | * cpu_present_map on the other hand can change dynamically. | |
| 48 | * In case when cpu_hotplug is not compiled, then we resort to current | |
| 49 | * behaviour, which is cpu_possible == cpu_present. | |
| 50 | * - Ashok Raj | |
| 51 | * | |
| 52 | * Three ways to find out the number of additional hotplug CPUs: | |
| 53 | * - If the BIOS specified disabled CPUs in ACPI/mptables use that. | |
| 54 | * - The user can overwrite it with additional_cpus=NUM | |
| 55 | * - Otherwise don't reserve additional CPUs. | |
| 56 | * We do this because additional CPUs waste a lot of memory. | |
| 57 | * -AK | |
| 58 | */ | |
| 59 | __init void prefill_possible_map(void) | |
| 60 | { | |
| 61 | int i; | |
| 62 | int possible; | |
| 63 | ||
| 64 | if (additional_cpus == -1) { | |
| 65 | if (disabled_cpus > 0) | |
| 66 | additional_cpus = disabled_cpus; | |
| 67 | else | |
| 68 | additional_cpus = 0; | |
| 69 | } | |
| 70 | possible = num_processors + additional_cpus; | |
| 71 | if (possible > NR_CPUS) | |
| 72 | possible = NR_CPUS; | |
| 73 | ||
| 74 | printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n", | |
| 75 | possible, max_t(int, possible - num_processors, 0)); | |
| 76 | ||
| 77 | for (i = 0; i < possible; i++) | |
| 78 | cpu_set(i, cpu_possible_map); | |
| 79 | } | |
| 80 | #endif | |
| 81 |