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 MSRs are special and need a special fence: */
  44         weak_wrmsr_fence();
  45         __x2apic_send_IPI_dest(dest, vector, APIC_DEST_PHYSICAL);
  46 }
  47
  48 static void
  49 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  50 {
  51         unsigned long query_cpu;
  52         unsigned long this_cpu;
  53         unsigned long flags;
  54
  55         /* x2apic MSRs are special and need a special fence: */
  56         weak_wrmsr_fence();
  57
  58         local_irq_save(flags);
  59
  60         this_cpu = smp_processor_id();
  61         for_each_cpu(query_cpu, mask) {
  62                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  63                         continue;
  64                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  65                                        vector, APIC_DEST_PHYSICAL);
  66         }
  67         local_irq_restore(flags);
  68 }
  69
  70 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  71 {
  72         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  73 }
  74
  75 static void
  76  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  77 {
  78         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  79 }
  80
  81 static void x2apic_send_IPI_allbutself(int vector)
  82 {
  83         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
  84 }
  85
  86 static void x2apic_send_IPI_all(int vector)
  87 {
  88         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
  89 }
  90
  91 static void init_x2apic_ldr(void)
  92 {
  93 }
  94
  95 static int x2apic_phys_probe(void)
  96 {
  97         if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
  98                 return 1;
  99
 100         return apic == &apic_x2apic_phys;
 101 }
 102
 103 static struct apic apic_x2apic_phys __ro_after_init = {
 104
 105         .name                           = "physical x2apic",
 106         .probe                          = x2apic_phys_probe,
 107         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 108         .apic_id_valid                  = x2apic_apic_id_valid,
 109         .apic_id_registered             = x2apic_apic_id_registered,
 110
 111         .irq_delivery_mode              = dest_Fixed,
 112         .irq_dest_mode                  = 0, /* physical */
 113
 114         .target_cpus                    = online_target_cpus,
 115         .disable_esr                    = 0,
 116         .dest_logical                   = 0,
 117         .check_apicid_used              = NULL,
 118
 119         .vector_allocation_domain       = default_vector_allocation_domain,
 120         .init_apic_ldr                  = init_x2apic_ldr,
 121
 122         .ioapic_phys_id_map             = NULL,
 123         .setup_apic_routing             = NULL,
 124         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 125         .apicid_to_cpu_present          = NULL,
 126         .check_phys_apicid_present      = default_check_phys_apicid_present,
 127         .phys_pkg_id                    = x2apic_phys_pkg_id,
 128
 129         .get_apic_id                    = x2apic_get_apic_id,
 130         .set_apic_id                    = x2apic_set_apic_id,
 131
 132         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 133
 134         .send_IPI                       = x2apic_send_IPI,
 135         .send_IPI_mask                  = x2apic_send_IPI_mask,
 136         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 137         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 138         .send_IPI_all                   = x2apic_send_IPI_all,
 139         .send_IPI_self                  = x2apic_send_IPI_self,
 140
 141         .inquire_remote_apic            = NULL,
 142
 143         .read                           = native_apic_msr_read,
 144         .write                          = native_apic_msr_write,
 145         .eoi_write                      = native_apic_msr_eoi_write,
 146         .icr_read                       = native_x2apic_icr_read,
 147         .icr_write                      = native_x2apic_icr_write,
 148         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 149         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 150 };
 151
 152 apic_driver(apic_x2apic_phys);