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