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 struct cpumask *x2apic_target_cpus(void)
  33 {
  34         return cpumask_of(0);
  35 }
  36
  37 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
  38 {
  39         cpumask_clear(retmask);
  40         cpumask_set_cpu(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 struct cpumask *mask, int vector)
  57 {
  58         unsigned long flags;
  59         unsigned long query_cpu;
  60
  61         local_irq_save(flags);
  62         for_each_cpu(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 struct cpumask *mask,
  70                                             int vector)
  71 {
  72         unsigned long flags;
  73         unsigned long query_cpu;
  74         unsigned long this_cpu = smp_processor_id();
  75
  76         local_irq_save(flags);
  77         for_each_cpu(query_cpu, mask) {
  78                 if (query_cpu != this_cpu)
  79                         __x2apic_send_IPI_dest(
  80                                 per_cpu(x86_cpu_to_apicid, query_cpu),
  81                                 vector, APIC_DEST_PHYSICAL);
  82         }
  83         local_irq_restore(flags);
  84 }
  85
  86 static void x2apic_send_IPI_allbutself(int vector)
  87 {
  88         unsigned long flags;
  89         unsigned long query_cpu;
  90         unsigned long this_cpu = smp_processor_id();
  91
  92         local_irq_save(flags);
  93         for_each_online_cpu(query_cpu)
  94                 if (query_cpu != this_cpu)
  95                         __x2apic_send_IPI_dest(
  96                                 per_cpu(x86_cpu_to_apicid, query_cpu),
  97                                 vector, APIC_DEST_PHYSICAL);
  98         local_irq_restore(flags);
  99 }
 100
 101 static void x2apic_send_IPI_all(int vector)
 102 {
 103         x2apic_send_IPI_mask(cpu_online_mask, vector);
 104 }
 105
 106 static int x2apic_apic_id_registered(void)
 107 {
 108         return 1;
 109 }
 110
 111 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 112 {
 113         int cpu;
 114
 115         /*
 116          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 117          * May as well be the first.
 118          */
 119         cpu = cpumask_first(cpumask);
 120         if ((unsigned)cpu < nr_cpu_ids)
 121                 return per_cpu(x86_cpu_to_apicid, cpu);
 122         else
 123                 return BAD_APICID;
 124 }
 125
 126 static unsigned int x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 127                                                   const struct cpumask *andmask)
 128 {
 129         int cpu;
 130
 131         /*
 132          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 133          * May as well be the first.
 134          */
 135         for_each_cpu_and(cpu, cpumask, andmask)
 136                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 137                         break;
 138         if (cpu < nr_cpu_ids)
 139                 return per_cpu(x86_cpu_to_apicid, cpu);
 140         return BAD_APICID;
 141 }
 142
 143 static unsigned int get_apic_id(unsigned long x)
 144 {
 145         unsigned int id;
 146
 147         id = x;
 148         return id;
 149 }
 150
 151 static unsigned long set_apic_id(unsigned int id)
 152 {
 153         unsigned long x;
 154
 155         x = id;
 156         return x;
 157 }
 158
 159 static unsigned int phys_pkg_id(int index_msb)
 160 {
 161         return current_cpu_data.initial_apicid >> index_msb;
 162 }
 163
 164 static void x2apic_send_IPI_self(int vector)
 165 {
 166         apic_write(APIC_SELF_IPI, vector);
 167 }
 168
 169 static void init_x2apic_ldr(void)
 170 {
 171         return;
 172 }
 173
 174 struct genapic apic_x2apic_phys = {
 175         .name = "physical x2apic",
 176         .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
 177         .int_delivery_mode = dest_Fixed,
 178         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
 179         .target_cpus = x2apic_target_cpus,
 180         .vector_allocation_domain = x2apic_vector_allocation_domain,
 181         .apic_id_registered = x2apic_apic_id_registered,
 182         .init_apic_ldr = init_x2apic_ldr,
 183         .send_IPI_all = x2apic_send_IPI_all,
 184         .send_IPI_allbutself = x2apic_send_IPI_allbutself,
 185         .send_IPI_mask = x2apic_send_IPI_mask,
 186         .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
 187         .send_IPI_self = x2apic_send_IPI_self,
 188         .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
 189         .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
 190         .phys_pkg_id = phys_pkg_id,
 191         .get_apic_id = get_apic_id,
 192         .set_apic_id = set_apic_id,
 193         .apic_id_mask = (0xFFFFFFFFu),
 194 };