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 static u32 x2apic_max_apicid __ro_after_init;
  12
  13 void __init x2apic_set_max_apicid(u32 apicid)
  14 {
  15         x2apic_max_apicid = apicid;
  16 }
  17
  18 static int __init set_x2apic_phys_mode(char *arg)
  19 {
  20         x2apic_phys = 1;
  21         return 0;
  22 }
  23 early_param("x2apic_phys", set_x2apic_phys_mode);
  24
  25 static bool x2apic_fadt_phys(void)
  26 {
  27 #ifdef CONFIG_ACPI
  28         if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
  29                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
  30                 printk(KERN_DEBUG "System requires x2apic physical mode\n");
  31                 return true;
  32         }
  33 #endif
  34         return false;
  35 }
  36
  37 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  38 {
  39         return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
  40 }
  41
  42 static void x2apic_send_IPI(int cpu, int vector)
  43 {
  44         u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
  45
  46         x2apic_wrmsr_fence();
  47         __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
  48 }
  49
  50 static void
  51 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  52 {
  53         unsigned long query_cpu;
  54         unsigned long this_cpu;
  55         unsigned long flags;
  56
  57         x2apic_wrmsr_fence();
  58
  59         local_irq_save(flags);
  60
  61         this_cpu = smp_processor_id();
  62         for_each_cpu(query_cpu, mask) {
  63                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  64                         continue;
  65                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  66                                        vector, APIC_DEST_PHYSICAL);
  67         }
  68         local_irq_restore(flags);
  69 }
  70
  71 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  72 {
  73         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  74 }
  75
  76 static void
  77  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  78 {
  79         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  80 }
  81
  82 static void x2apic_send_IPI_allbutself(int vector)
  83 {
  84         __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
  85 }
  86
  87 static void x2apic_send_IPI_all(int vector)
  88 {
  89         __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
  90 }
  91
  92 static void init_x2apic_ldr(void)
  93 {
  94 }
  95
  96 static int x2apic_phys_probe(void)
  97 {
  98         if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
  99                 return 1;
 100
 101         return apic == &apic_x2apic_phys;
 102 }
 103
 104 /* Common x2apic functions, also used by x2apic_cluster */
 105 int x2apic_apic_id_valid(u32 apicid)
 106 {
 107         if (x2apic_max_apicid && apicid > x2apic_max_apicid)
 108                 return 0;
 109
 110         return 1;
 111 }
 112
 113 int x2apic_apic_id_registered(void)
 114 {
 115         return 1;
 116 }
 117
 118 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 119 {
 120         unsigned long cfg = __prepare_ICR(0, vector, dest);
 121         native_x2apic_icr_write(cfg, apicid);
 122 }
 123
 124 void __x2apic_send_IPI_shorthand(int vector, u32 which)
 125 {
 126         unsigned long cfg = __prepare_ICR(which, vector, 0);
 127
 128         x2apic_wrmsr_fence();
 129         native_x2apic_icr_write(cfg, 0);
 130 }
 131
 132 unsigned int x2apic_get_apic_id(unsigned long id)
 133 {
 134         return id;
 135 }
 136
 137 u32 x2apic_set_apic_id(unsigned int id)
 138 {
 139         return id;
 140 }
 141
 142 int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
 143 {
 144         return initial_apicid >> index_msb;
 145 }
 146
 147 void x2apic_send_IPI_self(int vector)
 148 {
 149         apic_write(APIC_SELF_IPI, vector);
 150 }
 151
 152 static struct apic apic_x2apic_phys __ro_after_init = {
 153
 154         .name                           = "physical x2apic",
 155         .probe                          = x2apic_phys_probe,
 156         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 157         .apic_id_valid                  = x2apic_apic_id_valid,
 158         .apic_id_registered             = x2apic_apic_id_registered,
 159
 160         .delivery_mode                  = APIC_DELIVERY_MODE_FIXED,
 161         .dest_mode_logical              = false,
 162
 163         .disable_esr                    = 0,
 164
 165         .check_apicid_used              = NULL,
 166         .init_apic_ldr                  = init_x2apic_ldr,
 167         .ioapic_phys_id_map             = NULL,
 168         .setup_apic_routing             = NULL,
 169         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 170         .apicid_to_cpu_present          = NULL,
 171         .check_phys_apicid_present      = default_check_phys_apicid_present,
 172         .phys_pkg_id                    = x2apic_phys_pkg_id,
 173
 174         .get_apic_id                    = x2apic_get_apic_id,
 175         .set_apic_id                    = x2apic_set_apic_id,
 176
 177         .calc_dest_apicid               = apic_default_calc_apicid,
 178
 179         .send_IPI                       = x2apic_send_IPI,
 180         .send_IPI_mask                  = x2apic_send_IPI_mask,
 181         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 182         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 183         .send_IPI_all                   = x2apic_send_IPI_all,
 184         .send_IPI_self                  = x2apic_send_IPI_self,
 185
 186         .inquire_remote_apic            = NULL,
 187
 188         .read                           = native_apic_msr_read,
 189         .write                          = native_apic_msr_write,
 190         .eoi_write                      = native_apic_msr_eoi_write,
 191         .icr_read                       = native_x2apic_icr_read,
 192         .icr_write                      = native_x2apic_icr_write,
 193         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 194         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 195 };
 196
 197 apic_driver(apic_x2apic_phys);