arch/x86/kernel/apic/x2apic_phys.c

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