arch/x86/kernel/apic/x2apic_phys.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/cpumask.h>
   4 #include <linux/acpi.h>
   5
   6 #include "local.h"
   7
   8 int x2apic_phys;
   9
  10 static struct apic apic_x2apic_phys;
  11
  12 static int __init set_x2apic_phys_mode(char *arg)
  13 {
  14         x2apic_phys = 1;
  15         return 0;
  16 }
  17 early_param("x2apic_phys", set_x2apic_phys_mode);
  18
  19 static bool x2apic_fadt_phys(void)
  20 {
  21 #ifdef CONFIG_ACPI
  22         if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
  23                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
  24                 printk(KERN_DEBUG "System requires x2apic physical mode\n");
  25                 return true;
  26         }
  27 #endif
  28         return false;
  29 }
  30
  31 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  32 {
  33         return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
  34 }
  35
  36 static void x2apic_send_IPI(int cpu, int vector)
  37 {
  38         u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
  39
  40         x2apic_wrmsr_fence();
  41         __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
  42 }
  43
  44 static void
  45 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  46 {
  47         unsigned long query_cpu;
  48         unsigned long this_cpu;
  49         unsigned long flags;
  50
  51         x2apic_wrmsr_fence();
  52
  53         local_irq_save(flags);
  54
  55         this_cpu = smp_processor_id();
  56         for_each_cpu(query_cpu, mask) {
  57                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  58                         continue;
  59                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  60                                        vector, APIC_DEST_PHYSICAL);
  61         }
  62         local_irq_restore(flags);
  63 }
  64
  65 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  66 {
  67         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  68 }
  69
  70 static void
  71  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  72 {
  73         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  74 }
  75
  76 static void x2apic_send_IPI_allbutself(int vector)
  77 {
  78         __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
  79 }
  80
  81 static void x2apic_send_IPI_all(int vector)
  82 {
  83         __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
  84 }
  85
  86 static void init_x2apic_ldr(void)
  87 {
  88 }
  89
  90 static int x2apic_phys_probe(void)
  91 {
  92         if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
  93                 return 1;
  94
  95         return apic == &apic_x2apic_phys;
  96 }
  97
  98 /* Common x2apic functions, also used by x2apic_cluster */
  99 int x2apic_apic_id_valid(u32 apicid)
 100 {
 101         return 1;
 102 }
 103
 104 int x2apic_apic_id_registered(void)
 105 {
 106         return 1;
 107 }
 108
 109 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 110 {
 111         unsigned long cfg = __prepare_ICR(0, vector, dest);
 112         native_x2apic_icr_write(cfg, apicid);
 113 }
 114
 115 void __x2apic_send_IPI_shorthand(int vector, u32 which)
 116 {
 117         unsigned long cfg = __prepare_ICR(which, vector, 0);
 118
 119         x2apic_wrmsr_fence();
 120         native_x2apic_icr_write(cfg, 0);
 121 }
 122
 123 unsigned int x2apic_get_apic_id(unsigned long id)
 124 {
 125         return id;
 126 }
 127
 128 u32 x2apic_set_apic_id(unsigned int id)
 129 {
 130         return id;
 131 }
 132
 133 int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
 134 {
 135         return initial_apicid >> index_msb;
 136 }
 137
 138 void x2apic_send_IPI_self(int vector)
 139 {
 140         apic_write(APIC_SELF_IPI, vector);
 141 }
 142
 143 static struct apic apic_x2apic_phys __ro_after_init = {
 144
 145         .name                           = "physical x2apic",
 146         .probe                          = x2apic_phys_probe,
 147         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 148         .apic_id_valid                  = x2apic_apic_id_valid,
 149         .apic_id_registered             = x2apic_apic_id_registered,
 150
 151         .irq_delivery_mode              = dest_Fixed,
 152         .irq_dest_mode                  = 0, /* physical */
 153
 154         .disable_esr                    = 0,
 155         .dest_logical                   = 0,
 156         .check_apicid_used              = NULL,
 157
 158         .init_apic_ldr                  = init_x2apic_ldr,
 159
 160         .ioapic_phys_id_map             = NULL,
 161         .setup_apic_routing             = NULL,
 162         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 163         .apicid_to_cpu_present          = NULL,
 164         .check_phys_apicid_present      = default_check_phys_apicid_present,
 165         .phys_pkg_id                    = x2apic_phys_pkg_id,
 166
 167         .get_apic_id                    = x2apic_get_apic_id,
 168         .set_apic_id                    = x2apic_set_apic_id,
 169
 170         .calc_dest_apicid               = apic_default_calc_apicid,
 171
 172         .send_IPI                       = x2apic_send_IPI,
 173         .send_IPI_mask                  = x2apic_send_IPI_mask,
 174         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 175         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 176         .send_IPI_all                   = x2apic_send_IPI_all,
 177         .send_IPI_self                  = x2apic_send_IPI_self,
 178
 179         .inquire_remote_apic            = NULL,
 180
 181         .read                           = native_apic_msr_read,
 182         .write                          = native_apic_msr_write,
 183         .eoi_write                      = native_apic_msr_eoi_write,
 184         .icr_read                       = native_x2apic_icr_read,
 185         .icr_write                      = native_x2apic_icr_write,
 186         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 187         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 188 };
 189
 190 apic_driver(apic_x2apic_phys);