LXR linux/arch/x86/kernel/genx2apic

   1#include <linux/threads.h>
   2#include <linux/cpumask.h>
   3#include <linux/string.h>
   4#include <linux/kernel.h>
   5#include <linux/ctype.h>
   6#include <linux/init.h>
   7#include <linux/dmar.h>
   8
   9#include <asm/smp.h>
  10#include <asm/ipi.h>
  11#include <asm/genapic.h>
  12
  13DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
  14
  15static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  16{
  17        if (cpu_has_x2apic)
  18                return 1;
  19
  20        return 0;
  21}
  22
  23/* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
  24
  25static cpumask_t x2apic_target_cpus(void)
  26{
  27        return cpumask_of_cpu(0);
  28}
  29
  30/*
  31 * for now each logical cpu is in its own vector allocation domain.
  32 */
  33static cpumask_t x2apic_vector_allocation_domain(int cpu)
  34{
  35        cpumask_t domain = CPU_MASK_NONE;
  36        cpu_set(cpu, domain);
  37        return domain;
  38}
  39
  40static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
  41                                   unsigned int dest)
  42{
  43        unsigned long cfg;
  44
  45        cfg = __prepare_ICR(0, vector, dest);
  46
  47        /*
  48         * send the IPI.
  49         */
  50        x2apic_icr_write(cfg, apicid);
  51}
  52
  53/*
  54 * for now, we send the IPI's one by one in the cpumask.
  55 * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
  56 * at once. We have 16 cpu's in a cluster. This will minimize IPI register
  57 * writes.
  58 */
  59static void x2apic_send_IPI_mask(cpumask_t mask, int vector)
  60{
  61        unsigned long flags;
  62        unsigned long query_cpu;
  63
  64        local_irq_save(flags);
  65        for_each_cpu_mask(query_cpu, mask) {
  66                __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  67                                       vector, APIC_DEST_LOGICAL);
  68        }
  69        local_irq_restore(flags);
  70}
  71
  72static void x2apic_send_IPI_allbutself(int vector)
  73{
  74        cpumask_t mask = cpu_online_map;
  75
  76        cpu_clear(smp_processor_id(), mask);
  77
  78        if (!cpus_empty(mask))
  79                x2apic_send_IPI_mask(mask, vector);
  80}
  81
  82static void x2apic_send_IPI_all(int vector)
  83{
  84        x2apic_send_IPI_mask(cpu_online_map, vector);
  85}
  86
  87static int x2apic_apic_id_registered(void)
  88{
  89        return 1;
  90}
  91
  92static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask)
  93{
  94        int cpu;
  95
  96        /*
  97         * We're using fixed IRQ delivery, can only return one phys APIC ID.
  98         * May as well be the first.
  99         */
 100        cpu = first_cpu(cpumask);
 101        if ((unsigned)cpu < NR_CPUS)
 102                return per_cpu(x86_cpu_to_logical_apicid, cpu);
 103        else
 104                return BAD_APICID;
 105}
 106
 107static unsigned int get_apic_id(unsigned long x)
 108{
 109        unsigned int id;
 110
 111        id = x;
 112        return id;
 113}
 114
 115static unsigned long set_apic_id(unsigned int id)
 116{
 117        unsigned long x;
 118
 119        x = id;
 120        return x;
 121}
 122
 123static unsigned int phys_pkg_id(int index_msb)
 124{
 125        return current_cpu_data.initial_apicid >> index_msb;
 126}
 127
 128static void x2apic_send_IPI_self(int vector)
 129{
 130        apic_write(APIC_SELF_IPI, vector);
 131}
 132
 133static void init_x2apic_ldr(void)
 134{
 135        int cpu = smp_processor_id();
 136
 137        per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 138        return;
 139}
 140
 141struct genapic apic_x2apic_cluster = {
 142        .name = "cluster x2apic",
 143        .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
 144        .int_delivery_mode = dest_LowestPrio,
 145        .int_dest_mode = (APIC_DEST_LOGICAL != 0),
 146        .target_cpus = x2apic_target_cpus,
 147        .vector_allocation_domain = x2apic_vector_allocation_domain,
 148        .apic_id_registered = x2apic_apic_id_registered,
 149        .init_apic_ldr = init_x2apic_ldr,
 150        .send_IPI_all = x2apic_send_IPI_all,
 151        .send_IPI_allbutself = x2apic_send_IPI_allbutself,
 152        .send_IPI_mask = x2apic_send_IPI_mask,
 153        .send_IPI_self = x2apic_send_IPI_self,
 154        .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
 155        .phys_pkg_id = phys_pkg_id,
 156        .get_apic_id = get_apic_id,
 157        .set_apic_id = set_apic_id,
 158        .apic_id_mask = (0xFFFFFFFFu),
 159};
 160