root/arch/x86/kernel/genx2apic_cluster.c

DEFINITIONS

1. x2apic_acpi_madt_oem_check
2. x2apic_target_cpus
3. x2apic_vector_allocation_domain
4. __x2apic_send_IPI_dest
5. x2apic_send_IPI_mask
6. x2apic_send_IPI_allbutself
7. x2apic_send_IPI_all
8. x2apic_apic_id_registered
9. x2apic_cpu_mask_to_apicid
10. get_apic_id
11. set_apic_id
12. phys_pkg_id
13. x2apic_send_IPI_self
14. init_x2apic_ldr

#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/dmar.h>

#include <asm/smp.h>
#include <asm/ipi.h>
#include <asm/genapic.h>

DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);

static int __init x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
        if (cpu_has_x2apic)
                return 1;

        return 0;
}

/* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */

static cpumask_t x2apic_target_cpus(void)
{
        return cpumask_of_cpu(0);
}

/*
 * for now each logical cpu is in its own vector allocation domain.
 */
static cpumask_t x2apic_vector_allocation_domain(int cpu)
{
        cpumask_t domain = CPU_MASK_NONE;
        cpu_set(cpu, domain);
        return domain;
}

static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
                                   unsigned int dest)
{
        unsigned long cfg;

        cfg = __prepare_ICR(0, vector, dest);

        /*
         * send the IPI.
         */
        x2apic_icr_write(cfg, apicid);
}

/*
 * for now, we send the IPI's one by one in the cpumask.
 * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
 * at once. We have 16 cpu's in a cluster. This will minimize IPI register
 * writes.
 */
static void x2apic_send_IPI_mask(cpumask_t mask, int vector)
{
        unsigned long flags;
        unsigned long query_cpu;

        local_irq_save(flags);
        for_each_cpu_mask(query_cpu, mask) {
                __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_logical_apicid, query_cpu),
                                       vector, APIC_DEST_LOGICAL);
        }
        local_irq_restore(flags);
}

static void x2apic_send_IPI_allbutself(int vector)
{
        cpumask_t mask = cpu_online_map;

        cpu_clear(smp_processor_id(), mask);

        if (!cpus_empty(mask))
                x2apic_send_IPI_mask(mask, vector);
}

static void x2apic_send_IPI_all(int vector)
{
        x2apic_send_IPI_mask(cpu_online_map, vector);
}

static int x2apic_apic_id_registered(void)
{
        return 1;
}

static unsigned int x2apic_cpu_mask_to_apicid(cpumask_t cpumask)
{
        int cpu;

        /*
         * We're using fixed IRQ delivery, can only return one phys APIC ID.
         * May as well be the first.
         */
        cpu = first_cpu(cpumask);
        if ((unsigned)cpu < NR_CPUS)
                return per_cpu(x86_cpu_to_logical_apicid, cpu);
        else
                return BAD_APICID;
}

static unsigned int get_apic_id(unsigned long x)
{
        unsigned int id;

        id = x;
        return id;
}

static unsigned long set_apic_id(unsigned int id)
{
        unsigned long x;

        x = id;
        return x;
}

static unsigned int phys_pkg_id(int index_msb)
{
        return current_cpu_data.initial_apicid >> index_msb;
}

static void x2apic_send_IPI_self(int vector)
{
        apic_write(APIC_SELF_IPI, vector);
}

static void init_x2apic_ldr(void)
{
        int cpu = smp_processor_id();

        per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
        return;
}

struct genapic apic_x2apic_cluster = {
        .name = "cluster x2apic",
        .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
        .int_delivery_mode = dest_LowestPrio,
        .int_dest_mode = (APIC_DEST_LOGICAL != 0),
        .target_cpus = x2apic_target_cpus,
        .vector_allocation_domain = x2apic_vector_allocation_domain,
        .apic_id_registered = x2apic_apic_id_registered,
        .init_apic_ldr = init_x2apic_ldr,
        .send_IPI_all = x2apic_send_IPI_all,
        .send_IPI_allbutself = x2apic_send_IPI_allbutself,
        .send_IPI_mask = x2apic_send_IPI_mask,
        .send_IPI_self = x2apic_send_IPI_self,
        .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
        .phys_pkg_id = phys_pkg_id,
        .get_apic_id = get_apic_id,
        .set_apic_id = set_apic_id,
        .apic_id_mask = (0xFFFFFFFFu),
};