arch/x86/kernel/apic/x2apic_phys.c

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