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 static u32 x2apic_max_apicid __ro_after_init;
  17
  18 void __init x2apic_set_max_apicid(u32 apicid)
  19 {
  20         x2apic_max_apicid = apicid;
  21 }
  22
  23 static int __init set_x2apic_phys_mode(char *arg)
  24 {
  25         x2apic_phys = 1;
  26         return 0;
  27 }
  28 early_param("x2apic_phys", set_x2apic_phys_mode);
  29
  30 static bool x2apic_fadt_phys(void)
  31 {
  32 #ifdef CONFIG_ACPI
  33         if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
  34                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
  35                 printk(KERN_DEBUG "System requires x2apic physical mode\n");
  36                 return true;
  37         }
  38 #endif
  39         return false;
  40 }
  41
  42 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  43 {
  44         return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
  45 }
  46
  47 static void x2apic_send_IPI(int cpu, int vector)
  48 {
  49         u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
  50
  51         /* x2apic MSRs are special and need a special fence: */
  52         weak_wrmsr_fence();
  53         __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
  54 }
  55
  56 static void
  57 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  58 {
  59         unsigned long query_cpu;
  60         unsigned long this_cpu;
  61         unsigned long flags;
  62
  63         /* x2apic MSRs are special and need a special fence: */
  64         weak_wrmsr_fence();
  65
  66         local_irq_save(flags);
  67
  68         this_cpu = smp_processor_id();
  69         for_each_cpu(query_cpu, mask) {
  70                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  71                         continue;
  72                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  73                                        vector, APIC_DEST_PHYSICAL);
  74         }
  75         local_irq_restore(flags);
  76 }
  77
  78 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  79 {
  80         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  81 }
  82
  83 static void
  84  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  85 {
  86         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  87 }
  88
  89 static void x2apic_send_IPI_allbutself(int vector)
  90 {
  91         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
  92 }
  93
  94 static void x2apic_send_IPI_all(int vector)
  95 {
  96         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
  97 }
  98
  99 static void init_x2apic_ldr(void)
 100 {
 101 }
 102
 103 static int x2apic_phys_probe(void)
 104 {
 105         if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
 106                 return 1;
 107
 108         return apic == &apic_x2apic_phys;
 109 }
 110
 111 /* Common x2apic functions, also used by x2apic_cluster */
 112 int x2apic_apic_id_valid(u32 apicid)
 113 {
 114         if (x2apic_max_apicid && apicid > x2apic_max_apicid)
 115                 return 0;
 116
 117         return 1;
 118 }
 119
 120 int x2apic_apic_id_registered(void)
 121 {
 122         return 1;
 123 }
 124
 125 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 126 {
 127         unsigned long cfg = __prepare_ICR(0, vector, dest);
 128         native_x2apic_icr_write(cfg, apicid);
 129 }
 130
 131 unsigned int x2apic_get_apic_id(unsigned long id)
 132 {
 133         return id;
 134 }
 135
 136 u32 x2apic_set_apic_id(unsigned int id)
 137 {
 138         return id;
 139 }
 140
 141 int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
 142 {
 143         return initial_apicid >> index_msb;
 144 }
 145
 146 void x2apic_send_IPI_self(int vector)
 147 {
 148         apic_write(APIC_SELF_IPI, vector);
 149 }
 150
 151 static struct apic apic_x2apic_phys __ro_after_init = {
 152
 153         .name                           = "physical x2apic",
 154         .probe                          = x2apic_phys_probe,
 155         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 156         .apic_id_valid                  = x2apic_apic_id_valid,
 157         .apic_id_registered             = x2apic_apic_id_registered,
 158
 159         .irq_delivery_mode              = dest_Fixed,
 160         .irq_dest_mode                  = 0, /* physical */
 161
 162         .disable_esr                    = 0,
 163         .dest_logical                   = 0,
 164         .check_apicid_used              = NULL,
 165
 166         .init_apic_ldr                  = init_x2apic_ldr,
 167
 168         .ioapic_phys_id_map             = NULL,
 169         .setup_apic_routing             = NULL,
 170         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 171         .apicid_to_cpu_present          = NULL,
 172         .check_phys_apicid_present      = default_check_phys_apicid_present,
 173         .phys_pkg_id                    = x2apic_phys_pkg_id,
 174
 175         .get_apic_id                    = x2apic_get_apic_id,
 176         .set_apic_id                    = x2apic_set_apic_id,
 177
 178         .calc_dest_apicid               = apic_default_calc_apicid,
 179
 180         .send_IPI                       = x2apic_send_IPI,
 181         .send_IPI_mask                  = x2apic_send_IPI_mask,
 182         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 183         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 184         .send_IPI_all                   = x2apic_send_IPI_all,
 185         .send_IPI_self                  = x2apic_send_IPI_self,
 186
 187         .inquire_remote_apic            = NULL,
 188
 189         .read                           = native_apic_msr_read,
 190         .write                          = native_apic_msr_write,
 191         .eoi_write                      = native_apic_msr_eoi_write,
 192         .icr_read                       = native_x2apic_icr_read,
 193         .icr_write                      = native_x2apic_icr_write,
 194         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 195         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 196 };
 197
 198 apic_driver(apic_x2apic_phys);