arch/x86/kernel/genx2apic_phys.c

   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
  13 static int x2apic_phys;
  14
  15 static int set_x2apic_phys_mode(char *arg)
  16 {
  17         x2apic_phys = 1;
  18         return 0;
  19 }
  20 early_param("x2apic_phys", set_x2apic_phys_mode);
  21
  22 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  23 {
  24         if (cpu_has_x2apic && x2apic_phys)
  25                 return 1;
  26
  27         return 0;
  28 }
  29
  30 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
  31
  32 static const cpumask_t *x2apic_target_cpus(void)
  33 {
  34         return &cpumask_of_cpu(0);
  35 }
  36
  37 static void x2apic_vector_allocation_domain(int cpu, cpumask_t *retmask)
  38 {
  39         cpus_clear(*retmask);
  40         cpu_set(cpu, *retmask);
  41 }
  42
  43 static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
  44                                    unsigned int dest)
  45 {
  46         unsigned long cfg;
  47
  48         cfg = __prepare_ICR(0, vector, dest);
  49
  50         /*
  51          * send the IPI.
  52          */
  53         x2apic_icr_write(cfg, apicid);
  54 }
  55
  56 static void x2apic_send_IPI_mask(const cpumask_t *mask, int vector)
  57 {
  58         unsigned long flags;
  59         unsigned long query_cpu;
  60
  61         local_irq_save(flags);
  62         for_each_cpu_mask_nr(query_cpu, *mask) {
  63                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  64                                        vector, APIC_DEST_PHYSICAL);
  65         }
  66         local_irq_restore(flags);
  67 }
  68
  69 static void x2apic_send_IPI_mask_allbutself(const cpumask_t *mask, int vector)
  70 {
  71         unsigned long flags;
  72         unsigned long query_cpu;
  73         unsigned long this_cpu = smp_processor_id();
  74
  75         local_irq_save(flags);
  76         for_each_cpu_mask_nr(query_cpu, *mask) {
  77                 if (query_cpu != this_cpu)
  78                         __x2apic_send_IPI_dest(
  79                                 per_cpu(x86_cpu_to_apicid, query_cpu),
  80                                 vector, APIC_DEST_PHYSICAL);
  81         }
  82         local_irq_restore(flags);
  83 }
  84
  85 static void x2apic_send_IPI_allbutself(int vector)
  86 {
  87         unsigned long flags;
  88         unsigned long query_cpu;
  89         unsigned long this_cpu = smp_processor_id();
  90
  91         local_irq_save(flags);
  92         for_each_online_cpu(query_cpu)
  93                 if (query_cpu != this_cpu)
  94                         __x2apic_send_IPI_dest(
  95                                 per_cpu(x86_cpu_to_apicid, query_cpu),
  96                                 vector, APIC_DEST_PHYSICAL);
  97         local_irq_restore(flags);
  98 }
  99
 100 static void x2apic_send_IPI_all(int vector)
 101 {
 102         x2apic_send_IPI_mask(&cpu_online_map, vector);
 103 }
 104
 105 static int x2apic_apic_id_registered(void)
 106 {
 107         return 1;
 108 }
 109
 110 static unsigned int x2apic_cpu_mask_to_apicid(const cpumask_t *cpumask)
 111 {
 112         int cpu;
 113
 114         /*
 115          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 116          * May as well be the first.
 117          */
 118         cpu = first_cpu(*cpumask);
 119         if ((unsigned)cpu < nr_cpu_ids)
 120                 return per_cpu(x86_cpu_to_apicid, cpu);
 121         else
 122                 return BAD_APICID;
 123 }
 124
 125 static unsigned int get_apic_id(unsigned long x)
 126 {
 127         unsigned int id;
 128
 129         id = x;
 130         return id;
 131 }
 132
 133 static unsigned long set_apic_id(unsigned int id)
 134 {
 135         unsigned long x;
 136
 137         x = id;
 138         return x;
 139 }
 140
 141 static unsigned int phys_pkg_id(int index_msb)
 142 {
 143         return current_cpu_data.initial_apicid >> index_msb;
 144 }
 145
 146 void x2apic_send_IPI_self(int vector)
 147 {
 148         apic_write(APIC_SELF_IPI, vector);
 149 }
 150
 151 void init_x2apic_ldr(void)
 152 {
 153         return;
 154 }
 155
 156 struct genapic apic_x2apic_phys = {
 157         .name = "physical x2apic",
 158         .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
 159         .int_delivery_mode = dest_Fixed,
 160         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
 161         .target_cpus = x2apic_target_cpus,
 162         .vector_allocation_domain = x2apic_vector_allocation_domain,
 163         .apic_id_registered = x2apic_apic_id_registered,
 164         .init_apic_ldr = init_x2apic_ldr,
 165         .send_IPI_all = x2apic_send_IPI_all,
 166         .send_IPI_allbutself = x2apic_send_IPI_allbutself,
 167         .send_IPI_mask = x2apic_send_IPI_mask,
 168         .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
 169         .send_IPI_self = x2apic_send_IPI_self,
 170         .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
 171         .phys_pkg_id = phys_pkg_id,
 172         .get_apic_id = get_apic_id,
 173         .set_apic_id = set_apic_id,
 174         .apic_id_mask = (0xFFFFFFFFu),
 175 };