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 u32 x2apic_max_apicid __ro_after_init = UINT_MAX;
  12
  13 void __init x2apic_set_max_apicid(u32 apicid)
  14 {
  15         x2apic_max_apicid = apicid;
  16         if (apic->x2apic_set_max_apicid)
  17                 apic->max_apic_id = apicid;
  18 }
  19
  20 static int __init set_x2apic_phys_mode(char *arg)
  21 {
  22         x2apic_phys = 1;
  23         return 0;
  24 }
  25 early_param("x2apic_phys", set_x2apic_phys_mode);
  26
  27 static bool x2apic_fadt_phys(void)
  28 {
  29 #ifdef CONFIG_ACPI
  30         if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
  31                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
  32                 printk(KERN_DEBUG "System requires x2apic physical mode\n");
  33                 return true;
  34         }
  35 #endif
  36         return false;
  37 }
  38
  39 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  40 {
  41         return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
  42 }
  43
  44 static void x2apic_send_IPI(int cpu, int vector)
  45 {
  46         u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
  47
  48         /* x2apic MSRs are special and need a special fence: */
  49         weak_wrmsr_fence();
  50         __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
  51 }
  52
  53 static void
  54 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  55 {
  56         unsigned long query_cpu;
  57         unsigned long this_cpu;
  58         unsigned long flags;
  59
  60         /* x2apic MSRs are special and need a special fence: */
  61         weak_wrmsr_fence();
  62
  63         local_irq_save(flags);
  64
  65         this_cpu = smp_processor_id();
  66         for_each_cpu(query_cpu, mask) {
  67                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  68                         continue;
  69                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  70                                        vector, APIC_DEST_PHYSICAL);
  71         }
  72         local_irq_restore(flags);
  73 }
  74
  75 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  76 {
  77         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  78 }
  79
  80 static void
  81  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  82 {
  83         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  84 }
  85
  86 static void __x2apic_send_IPI_shorthand(int vector, u32 which)
  87 {
  88         unsigned long cfg = __prepare_ICR(which, vector, 0);
  89
  90         /* x2apic MSRs are special and need a special fence: */
  91         weak_wrmsr_fence();
  92         native_x2apic_icr_write(cfg, 0);
  93 }
  94
  95 void x2apic_send_IPI_allbutself(int vector)
  96 {
  97         __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLBUT);
  98 }
  99
 100 void x2apic_send_IPI_all(int vector)
 101 {
 102         __x2apic_send_IPI_shorthand(vector, APIC_DEST_ALLINC);
 103 }
 104
 105 void x2apic_send_IPI_self(int vector)
 106 {
 107         apic_write(APIC_SELF_IPI, vector);
 108 }
 109
 110 void __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
 111 {
 112         unsigned long cfg = __prepare_ICR(0, vector, dest);
 113         native_x2apic_icr_write(cfg, apicid);
 114 }
 115
 116 static int x2apic_phys_probe(void)
 117 {
 118         if (!x2apic_mode)
 119                 return 0;
 120
 121         if (x2apic_phys || x2apic_fadt_phys())
 122                 return 1;
 123
 124         return apic == &apic_x2apic_phys;
 125 }
 126
 127 u32 x2apic_get_apic_id(u32 id)
 128 {
 129         return id;
 130 }
 131
 132 static struct apic apic_x2apic_phys __ro_after_init = {
 133
 134         .name                           = "physical x2apic",
 135         .probe                          = x2apic_phys_probe,
 136         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 137
 138         .dest_mode_logical              = false,
 139
 140         .disable_esr                    = 0,
 141
 142         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 143
 144         .max_apic_id                    = UINT_MAX,
 145         .x2apic_set_max_apicid          = true,
 146         .get_apic_id                    = x2apic_get_apic_id,
 147
 148         .calc_dest_apicid               = apic_default_calc_apicid,
 149
 150         .send_IPI                       = x2apic_send_IPI,
 151         .send_IPI_mask                  = x2apic_send_IPI_mask,
 152         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 153         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 154         .send_IPI_all                   = x2apic_send_IPI_all,
 155         .send_IPI_self                  = x2apic_send_IPI_self,
 156         .nmi_to_offline_cpu             = true,
 157
 158         .read                           = native_apic_msr_read,
 159         .write                          = native_apic_msr_write,
 160         .eoi                            = native_apic_msr_eoi,
 161         .icr_read                       = native_x2apic_icr_read,
 162         .icr_write                      = native_x2apic_icr_write,
 163 };
 164
 165 apic_driver(apic_x2apic_phys);