arch/x86/kernel/apic/x2apic_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/apic.h>
  11 #include <asm/ipi.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         native_x2apic_icr_write(cfg, apicid);
  54 }
  55
  56 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  57 {
  58         unsigned long query_cpu;
  59         unsigned long flags;
  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
  70  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  71 {
  72         unsigned long this_cpu = smp_processor_id();
  73         unsigned long query_cpu;
  74         unsigned long flags;
  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 this_cpu = smp_processor_id();
  89         unsigned long query_cpu;
  90         unsigned long flags;
  91
  92         local_irq_save(flags);
  93         for_each_online_cpu(query_cpu) {
  94                 if (query_cpu == this_cpu)
  95                         continue;
  96                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  97                                        vector, APIC_DEST_PHYSICAL);
  98         }
  99         local_irq_restore(flags);
 100 }
 101
 102 static void x2apic_send_IPI_all(int vector)
 103 {
 104         x2apic_send_IPI_mask(cpu_online_mask, vector);
 105 }
 106
 107 static int x2apic_apic_id_registered(void)
 108 {
 109         return 1;
 110 }
 111
 112 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 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         int cpu = cpumask_first(cpumask);
 119
 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
 127 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 128                               const struct cpumask *andmask)
 129 {
 130         int cpu;
 131
 132         /*
 133          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 134          * May as well be the first.
 135          */
 136         for_each_cpu_and(cpu, cpumask, andmask) {
 137                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 138                         break;
 139         }
 140
 141         if (cpu < nr_cpu_ids)
 142                 return per_cpu(x86_cpu_to_apicid, cpu);
 143
 144         return BAD_APICID;
 145 }
 146
 147 static unsigned int x2apic_phys_get_apic_id(unsigned long x)
 148 {
 149         return x;
 150 }
 151
 152 static unsigned long set_apic_id(unsigned int id)
 153 {
 154         return id;
 155 }
 156
 157 static int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
 158 {
 159         return current_cpu_data.initial_apicid >> index_msb;
 160 }
 161
 162 static void x2apic_send_IPI_self(int vector)
 163 {
 164         apic_write(APIC_SELF_IPI, vector);
 165 }
 166
 167 static void init_x2apic_ldr(void)
 168 {
 169 }
 170
 171 struct apic apic_x2apic_phys = {
 172
 173         .name                           = "physical x2apic",
 174         .probe                          = NULL,
 175         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 176         .apic_id_registered             = x2apic_apic_id_registered,
 177
 178         .irq_delivery_mode              = dest_Fixed,
 179         .irq_dest_mode                  = 0, /* physical */
 180
 181         .target_cpus                    = x2apic_target_cpus,
 182         .disable_esr                    = 0,
 183         .dest_logical                   = 0,
 184         .check_apicid_used              = NULL,
 185         .check_apicid_present           = NULL,
 186
 187         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 188         .init_apic_ldr                  = init_x2apic_ldr,
 189
 190         .ioapic_phys_id_map             = NULL,
 191         .setup_apic_routing             = NULL,
 192         .multi_timer_check              = NULL,
 193         .apicid_to_node                 = NULL,
 194         .cpu_to_logical_apicid          = NULL,
 195         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 196         .apicid_to_cpu_present          = NULL,
 197         .setup_portio_remap             = NULL,
 198         .check_phys_apicid_present      = default_check_phys_apicid_present,
 199         .enable_apic_mode               = NULL,
 200         .phys_pkg_id                    = x2apic_phys_pkg_id,
 201         .mps_oem_check                  = NULL,
 202
 203         .get_apic_id                    = x2apic_phys_get_apic_id,
 204         .set_apic_id                    = set_apic_id,
 205         .apic_id_mask                   = 0xFFFFFFFFu,
 206
 207         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 208         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 209
 210         .send_IPI_mask                  = x2apic_send_IPI_mask,
 211         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 212         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 213         .send_IPI_all                   = x2apic_send_IPI_all,
 214         .send_IPI_self                  = x2apic_send_IPI_self,
 215
 216         .wakeup_cpu                     = NULL,
 217         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 218         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 219         .wait_for_init_deassert         = NULL,
 220         .smp_callin_clear_local_apic    = NULL,
 221         .inquire_remote_apic            = NULL,
 222
 223         .read                           = native_apic_msr_read,
 224         .write                          = native_apic_msr_write,
 225         .icr_read                       = native_x2apic_icr_read,
 226         .icr_write                      = native_x2apic_icr_write,
 227         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 228         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 229 };