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
  40 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  41 {
  42         unsigned long query_cpu;
  43         unsigned long this_cpu;
  44         unsigned long flags;
  45
  46         x2apic_wrmsr_fence();
  47
  48         local_irq_save(flags);
  49
  50         this_cpu = smp_processor_id();
  51         for_each_cpu(query_cpu, mask) {
  52                 if (apic_dest == APIC_DEST_ALLBUT && this_cpu == query_cpu)
  53                         continue;
  54                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  55                                        vector, APIC_DEST_PHYSICAL);
  56         }
  57         local_irq_restore(flags);
  58 }
  59
  60 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  61 {
  62         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  63 }
  64
  65 static void
  66  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  67 {
  68         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  69 }
  70
  71 static void x2apic_send_IPI_allbutself(int vector)
  72 {
  73         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
  74 }
  75
  76 static void x2apic_send_IPI_all(int vector)
  77 {
  78         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
  79 }
  80
  81 static void init_x2apic_ldr(void)
  82 {
  83 }
  84
  85 static int x2apic_phys_probe(void)
  86 {
  87         if (x2apic_mode && (x2apic_phys || x2apic_fadt_phys()))
  88                 return 1;
  89
  90         return apic == &apic_x2apic_phys;
  91 }
  92
  93 static struct apic apic_x2apic_phys = {
  94
  95         .name                           = "physical x2apic",
  96         .probe                          = x2apic_phys_probe,
  97         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
  98         .apic_id_valid                  = x2apic_apic_id_valid,
  99         .apic_id_registered             = x2apic_apic_id_registered,
 100
 101         .irq_delivery_mode              = dest_Fixed,
 102         .irq_dest_mode                  = 0, /* physical */
 103
 104         .target_cpus                    = online_target_cpus,
 105         .disable_esr                    = 0,
 106         .dest_logical                   = 0,
 107         .check_apicid_used              = NULL,
 108
 109         .vector_allocation_domain       = default_vector_allocation_domain,
 110         .init_apic_ldr                  = init_x2apic_ldr,
 111
 112         .ioapic_phys_id_map             = NULL,
 113         .setup_apic_routing             = NULL,
 114         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 115         .apicid_to_cpu_present          = NULL,
 116         .check_phys_apicid_present      = default_check_phys_apicid_present,
 117         .phys_pkg_id                    = x2apic_phys_pkg_id,
 118
 119         .get_apic_id                    = x2apic_get_apic_id,
 120         .set_apic_id                    = x2apic_set_apic_id,
 121         .apic_id_mask                   = 0xFFFFFFFFu,
 122
 123         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 124
 125         .send_IPI_mask                  = x2apic_send_IPI_mask,
 126         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 127         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 128         .send_IPI_all                   = x2apic_send_IPI_all,
 129         .send_IPI_self                  = x2apic_send_IPI_self,
 130
 131         .wait_for_init_deassert         = false,
 132         .inquire_remote_apic            = NULL,
 133
 134         .read                           = native_apic_msr_read,
 135         .write                          = native_apic_msr_write,
 136         .eoi_write                      = native_apic_msr_eoi_write,
 137         .icr_read                       = native_x2apic_icr_read,
 138         .icr_write                      = native_x2apic_icr_write,
 139         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 140         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 141 };
 142
 143 apic_driver(apic_x2apic_phys);