2008-03-03 10:12:42 -07:00
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#include <linux/init.h>
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#include <linux/smp.h>
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2008-03-03 10:12:58 -07:00
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#include <linux/module.h>
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2008-03-03 10:12:42 -07:00
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2008-03-03 10:12:58 -07:00
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/* Number of siblings per CPU package */
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int smp_num_siblings = 1;
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EXPORT_SYMBOL(smp_num_siblings);
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/* Last level cache ID of each logical CPU */
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DEFINE_PER_CPU(u16, cpu_llc_id) = BAD_APICID;
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/* bitmap of online cpus */
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cpumask_t cpu_online_map __read_mostly;
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EXPORT_SYMBOL(cpu_online_map);
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cpumask_t cpu_callin_map;
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cpumask_t cpu_callout_map;
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cpumask_t cpu_possible_map;
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EXPORT_SYMBOL(cpu_possible_map);
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/* representing HT siblings of each logical CPU */
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DEFINE_PER_CPU(cpumask_t, cpu_sibling_map);
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EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
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/* representing HT and core siblings of each logical CPU */
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DEFINE_PER_CPU(cpumask_t, cpu_core_map);
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EXPORT_PER_CPU_SYMBOL(cpu_core_map);
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/* Per CPU bogomips and other parameters */
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DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
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EXPORT_PER_CPU_SYMBOL(cpu_info);
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2008-03-03 10:13:02 -07:00
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/* representing cpus for which sibling maps can be computed */
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static cpumask_t cpu_sibling_setup_map;
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void __cpuinit set_cpu_sibling_map(int cpu)
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{
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int i;
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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cpu_set(cpu, cpu_sibling_setup_map);
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if (smp_num_siblings > 1) {
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for_each_cpu_mask(i, cpu_sibling_setup_map) {
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if (c->phys_proc_id == cpu_data(i).phys_proc_id &&
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c->cpu_core_id == cpu_data(i).cpu_core_id) {
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cpu_set(i, per_cpu(cpu_sibling_map, cpu));
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cpu_set(cpu, per_cpu(cpu_sibling_map, i));
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cpu_set(i, per_cpu(cpu_core_map, cpu));
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cpu_set(cpu, per_cpu(cpu_core_map, i));
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cpu_set(i, c->llc_shared_map);
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cpu_set(cpu, cpu_data(i).llc_shared_map);
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}
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}
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} else {
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cpu_set(cpu, per_cpu(cpu_sibling_map, cpu));
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}
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cpu_set(cpu, c->llc_shared_map);
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if (current_cpu_data.x86_max_cores == 1) {
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per_cpu(cpu_core_map, cpu) = per_cpu(cpu_sibling_map, cpu);
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c->booted_cores = 1;
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return;
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}
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for_each_cpu_mask(i, cpu_sibling_setup_map) {
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if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
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per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
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cpu_set(i, c->llc_shared_map);
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cpu_set(cpu, cpu_data(i).llc_shared_map);
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}
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if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
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cpu_set(i, per_cpu(cpu_core_map, cpu));
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cpu_set(cpu, per_cpu(cpu_core_map, i));
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/*
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* Does this new cpu bringup a new core?
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*/
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if (cpus_weight(per_cpu(cpu_sibling_map, cpu)) == 1) {
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/*
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* for each core in package, increment
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* the booted_cores for this new cpu
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*/
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if (first_cpu(per_cpu(cpu_sibling_map, i)) == i)
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c->booted_cores++;
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/*
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* increment the core count for all
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* the other cpus in this package
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*/
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if (i != cpu)
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cpu_data(i).booted_cores++;
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} else if (i != cpu && !c->booted_cores)
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c->booted_cores = cpu_data(i).booted_cores;
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}
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}
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}
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2008-03-03 10:12:42 -07:00
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#ifdef CONFIG_HOTPLUG_CPU
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2008-03-03 10:13:02 -07:00
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void remove_siblinginfo(int cpu)
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{
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int sibling;
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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for_each_cpu_mask(sibling, per_cpu(cpu_core_map, cpu)) {
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cpu_clear(cpu, per_cpu(cpu_core_map, sibling));
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/*/
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* last thread sibling in this cpu core going down
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*/
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if (cpus_weight(per_cpu(cpu_sibling_map, cpu)) == 1)
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cpu_data(sibling).booted_cores--;
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}
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for_each_cpu_mask(sibling, per_cpu(cpu_sibling_map, cpu))
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cpu_clear(cpu, per_cpu(cpu_sibling_map, sibling));
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cpus_clear(per_cpu(cpu_sibling_map, cpu));
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cpus_clear(per_cpu(cpu_core_map, cpu));
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c->phys_proc_id = 0;
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c->cpu_core_id = 0;
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cpu_clear(cpu, cpu_sibling_setup_map);
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}
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2008-03-03 10:12:42 -07:00
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int additional_cpus __initdata = -1;
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static __init int setup_additional_cpus(char *s)
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{
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return s && get_option(&s, &additional_cpus) ? 0 : -EINVAL;
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}
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early_param("additional_cpus", setup_additional_cpus);
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/*
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* cpu_possible_map should be static, it cannot change as cpu's
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* are onlined, or offlined. The reason is per-cpu data-structures
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* are allocated by some modules at init time, and dont expect to
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* do this dynamically on cpu arrival/departure.
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* cpu_present_map on the other hand can change dynamically.
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* In case when cpu_hotplug is not compiled, then we resort to current
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* behaviour, which is cpu_possible == cpu_present.
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* - Ashok Raj
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*
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* Three ways to find out the number of additional hotplug CPUs:
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* - If the BIOS specified disabled CPUs in ACPI/mptables use that.
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* - The user can overwrite it with additional_cpus=NUM
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* - Otherwise don't reserve additional CPUs.
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* We do this because additional CPUs waste a lot of memory.
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* -AK
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*/
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__init void prefill_possible_map(void)
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{
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int i;
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int possible;
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if (additional_cpus == -1) {
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if (disabled_cpus > 0)
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additional_cpus = disabled_cpus;
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else
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additional_cpus = 0;
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}
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possible = num_processors + additional_cpus;
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if (possible > NR_CPUS)
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possible = NR_CPUS;
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printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
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possible, max_t(int, possible - num_processors, 0));
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for (i = 0; i < possible; i++)
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cpu_set(i, cpu_possible_map);
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}
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#endif
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