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/x2apic.h>
  11
  12 int x2apic_phys;
  13
  14 static int set_x2apic_phys_mode(char *arg)
  15 {
  16         x2apic_phys = 1;
  17         return 0;
  18 }
  19 early_param("x2apic_phys", set_x2apic_phys_mode);
  20
  21 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  22 {
  23         if (x2apic_phys)
  24                 return x2apic_enabled();
  25         else
  26                 return 0;
  27 }
  28
  29 static void
  30 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  31 {
  32         unsigned long query_cpu;
  33         unsigned long this_cpu;
  34         unsigned long flags;
  35
  36         x2apic_wrmsr_fence();
  37
  38         local_irq_save(flags);
  39
  40         this_cpu = smp_processor_id();
  41         for_each_cpu(query_cpu, mask) {
  42                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  43                         continue;
  44                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  45                                        vector, APIC_DEST_PHYSICAL);
  46         }
  47         local_irq_restore(flags);
  48 }
  49
  50 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  51 {
  52         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  53 }
  54
  55 static void
  56  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  57 {
  58         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  59 }
  60
  61 static void x2apic_send_IPI_allbutself(int vector)
  62 {
  63         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
  64 }
  65
  66 static void x2apic_send_IPI_all(int vector)
  67 {
  68         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
  69 }
  70
  71 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
  72 {
  73         /*
  74          * We're using fixed IRQ delivery, can only return one phys APIC ID.
  75          * May as well be the first.
  76          */
  77         int cpu = cpumask_first(cpumask);
  78
  79         if ((unsigned)cpu < nr_cpu_ids)
  80                 return per_cpu(x86_cpu_to_apicid, cpu);
  81         else
  82                 return BAD_APICID;
  83 }
  84
  85 static unsigned int
  86 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
  87                               const struct cpumask *andmask)
  88 {
  89         int cpu;
  90
  91         /*
  92          * We're using fixed IRQ delivery, can only return one phys APIC ID.
  93          * May as well be the first.
  94          */
  95         for_each_cpu_and(cpu, cpumask, andmask) {
  96                 if (cpumask_test_cpu(cpu, cpu_online_mask))
  97                         break;
  98         }
  99
 100         return per_cpu(x86_cpu_to_apicid, cpu);
 101 }
 102
 103 static void init_x2apic_ldr(void)
 104 {
 105 }
 106
 107 static int x2apic_phys_probe(void)
 108 {
 109         if (x2apic_mode && x2apic_phys)
 110                 return 1;
 111
 112         return apic == &apic_x2apic_phys;
 113 }
 114
 115 struct apic apic_x2apic_phys = {
 116
 117         .name                           = "physical x2apic",
 118         .probe                          = x2apic_phys_probe,
 119         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 120         .apic_id_registered             = x2apic_apic_id_registered,
 121
 122         .irq_delivery_mode              = dest_Fixed,
 123         .irq_dest_mode                  = 0, /* physical */
 124
 125         .target_cpus                    = x2apic_target_cpus,
 126         .disable_esr                    = 0,
 127         .dest_logical                   = 0,
 128         .check_apicid_used              = NULL,
 129         .check_apicid_present           = NULL,
 130
 131         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 132         .init_apic_ldr                  = init_x2apic_ldr,
 133
 134         .ioapic_phys_id_map             = NULL,
 135         .setup_apic_routing             = NULL,
 136         .multi_timer_check              = NULL,
 137         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 138         .apicid_to_cpu_present          = NULL,
 139         .setup_portio_remap             = NULL,
 140         .check_phys_apicid_present      = default_check_phys_apicid_present,
 141         .enable_apic_mode               = NULL,
 142         .phys_pkg_id                    = x2apic_phys_pkg_id,
 143         .mps_oem_check                  = NULL,
 144
 145         .get_apic_id                    = x2apic_get_apic_id,
 146         .set_apic_id                    = x2apic_set_apic_id,
 147         .apic_id_mask                   = 0xFFFFFFFFu,
 148
 149         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 150         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 151
 152         .send_IPI_mask                  = x2apic_send_IPI_mask,
 153         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 154         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 155         .send_IPI_all                   = x2apic_send_IPI_all,
 156         .send_IPI_self                  = x2apic_send_IPI_self,
 157
 158         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 159         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 160         .wait_for_init_deassert         = NULL,
 161         .smp_callin_clear_local_apic    = NULL,
 162         .inquire_remote_apic            = NULL,
 163
 164         .read                           = native_apic_msr_read,
 165         .write                          = native_apic_msr_write,
 166         .icr_read                       = native_x2apic_icr_read,
 167         .icr_write                      = native_x2apic_icr_write,
 168         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 169         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 170 };
 171
 172 apic_driver(apic_x2apic_phys);