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/x2apic.h>
  11
  12 int x2apic_phys;
  13
  14 static struct apic apic_x2apic_phys;
  15
  16 static int set_x2apic_phys_mode(char *arg)
  17 {
  18         x2apic_phys = 1;
  19         return 0;
  20 }
  21 early_param("x2apic_phys", set_x2apic_phys_mode);
  22
  23 static bool x2apic_fadt_phys(void)
  24 {
  25 #ifdef CONFIG_ACPI
  26         if ((acpi_gbl_FADT.header.revision >= FADT2_REVISION_ID) &&
  27                 (acpi_gbl_FADT.flags & ACPI_FADT_APIC_PHYSICAL)) {
  28                 printk(KERN_DEBUG "System requires x2apic physical mode\n");
  29                 return true;
  30         }
  31 #endif
  32         return false;
  33 }
  34
  35 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  36 {
  37         return x2apic_enabled() && (x2apic_phys || x2apic_fadt_phys());
  38 }
  39
  40 static void x2apic_send_IPI(int cpu, int vector)
  41 {
  42         u32 dest = per_cpu(x86_cpu_to_apicid, cpu);
  43
  44         /* x2apic MSRs are special and need a special fence: */
  45         weak_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 MSRs are special and need a special fence: */
  57         weak_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_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
  85 }
  86
  87 static void x2apic_send_IPI_all(int vector)
  88 {
  89         __x2apic_send_IPI_mask(cpu_online_mask, 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 static struct apic apic_x2apic_phys __ro_after_init = {
 105
 106         .name                           = "physical x2apic",
 107         .probe                          = x2apic_phys_probe,
 108         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 109         .apic_id_valid                  = x2apic_apic_id_valid,
 110         .apic_id_registered             = x2apic_apic_id_registered,
 111
 112         .irq_delivery_mode              = dest_Fixed,
 113         .irq_dest_mode                  = 0, /* physical */
 114
 115         .target_cpus                    = online_target_cpus,
 116         .disable_esr                    = 0,
 117         .dest_logical                   = 0,
 118         .check_apicid_used              = NULL,
 119
 120         .vector_allocation_domain       = default_vector_allocation_domain,
 121         .init_apic_ldr                  = init_x2apic_ldr,
 122
 123         .ioapic_phys_id_map             = NULL,
 124         .setup_apic_routing             = NULL,
 125         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 126         .apicid_to_cpu_present          = NULL,
 127         .check_phys_apicid_present      = default_check_phys_apicid_present,
 128         .phys_pkg_id                    = x2apic_phys_pkg_id,
 129
 130         .get_apic_id                    = x2apic_get_apic_id,
 131         .set_apic_id                    = x2apic_set_apic_id,
 132
 133         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 134
 135         .send_IPI                       = x2apic_send_IPI,
 136         .send_IPI_mask                  = x2apic_send_IPI_mask,
 137         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 138         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 139         .send_IPI_all                   = x2apic_send_IPI_all,
 140         .send_IPI_self                  = x2apic_send_IPI_self,
 141
 142         .inquire_remote_apic            = NULL,
 143
 144         .read                           = native_apic_msr_read,
 145         .write                          = native_apic_msr_write,
 146         .eoi_write                      = native_apic_msr_eoi_write,
 147         .icr_read                       = native_x2apic_icr_read,
 148         .icr_write                      = native_x2apic_icr_write,
 149         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 150         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 151 };
 152
 153 apic_driver(apic_x2apic_phys);