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/init.h>
   7 #include <linux/dmar.h>
   8
   9 #include <asm/smp.h>
  10 #include <asm/apic.h>
  11 #include <asm/ipi.h>
  12
  13 int 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 int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  23 {
  24         if (x2apic_phys)
  25                 return x2apic_enabled();
  26         else
  27                 return 0;
  28 }
  29
  30 /*
  31  * need to use more than cpu 0, because we need more vectors when
  32  * MSI-X are used.
  33  */
  34 static const struct cpumask *x2apic_target_cpus(void)
  35 {
  36         return cpu_online_mask;
  37 }
  38
  39 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
  40 {
  41         cpumask_clear(retmask);
  42         cpumask_set_cpu(cpu, retmask);
  43 }
  44
  45 static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
  46                                    unsigned int dest)
  47 {
  48         unsigned long cfg;
  49
  50         cfg = __prepare_ICR(0, vector, dest);
  51
  52         /*
  53          * send the IPI.
  54          */
  55         native_x2apic_icr_write(cfg, apicid);
  56 }
  57
  58 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  59 {
  60         unsigned long query_cpu;
  61         unsigned long flags;
  62
  63         x2apic_wrmsr_fence();
  64
  65         local_irq_save(flags);
  66         for_each_cpu(query_cpu, mask) {
  67                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
  68                                        vector, APIC_DEST_PHYSICAL);
  69         }
  70         local_irq_restore(flags);
  71 }
  72
  73 static void
  74  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  75 {
  76         unsigned long this_cpu = smp_processor_id();
  77         unsigned long query_cpu;
  78         unsigned long flags;
  79
  80         x2apic_wrmsr_fence();
  81
  82         local_irq_save(flags);
  83         for_each_cpu(query_cpu, mask) {
  84                 if (query_cpu != this_cpu)
  85                         __x2apic_send_IPI_dest(
  86                                 per_cpu(x86_cpu_to_apicid, query_cpu),
  87                                 vector, APIC_DEST_PHYSICAL);
  88         }
  89         local_irq_restore(flags);
  90 }
  91
  92 static void x2apic_send_IPI_allbutself(int vector)
  93 {
  94         unsigned long this_cpu = smp_processor_id();
  95         unsigned long query_cpu;
  96         unsigned long flags;
  97
  98         x2apic_wrmsr_fence();
  99
 100         local_irq_save(flags);
 101         for_each_online_cpu(query_cpu) {
 102                 if (query_cpu == this_cpu)
 103                         continue;
 104                 __x2apic_send_IPI_dest(per_cpu(x86_cpu_to_apicid, query_cpu),
 105                                        vector, APIC_DEST_PHYSICAL);
 106         }
 107         local_irq_restore(flags);
 108 }
 109
 110 static void x2apic_send_IPI_all(int vector)
 111 {
 112         x2apic_send_IPI_mask(cpu_online_mask, vector);
 113 }
 114
 115 static int x2apic_apic_id_registered(void)
 116 {
 117         return 1;
 118 }
 119
 120 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 121 {
 122         /*
 123          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 124          * May as well be the first.
 125          */
 126         int cpu = cpumask_first(cpumask);
 127
 128         if ((unsigned)cpu < nr_cpu_ids)
 129                 return per_cpu(x86_cpu_to_apicid, cpu);
 130         else
 131                 return BAD_APICID;
 132 }
 133
 134 static unsigned int
 135 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 136                               const struct cpumask *andmask)
 137 {
 138         int cpu;
 139
 140         /*
 141          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 142          * May as well be the first.
 143          */
 144         for_each_cpu_and(cpu, cpumask, andmask) {
 145                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 146                         break;
 147         }
 148
 149         if (cpu < nr_cpu_ids)
 150                 return per_cpu(x86_cpu_to_apicid, cpu);
 151
 152         return BAD_APICID;
 153 }
 154
 155 static unsigned int x2apic_phys_get_apic_id(unsigned long x)
 156 {
 157         return x;
 158 }
 159
 160 static unsigned long set_apic_id(unsigned int id)
 161 {
 162         return id;
 163 }
 164
 165 static int x2apic_phys_pkg_id(int initial_apicid, int index_msb)
 166 {
 167         return initial_apicid >> index_msb;
 168 }
 169
 170 static void x2apic_send_IPI_self(int vector)
 171 {
 172         apic_write(APIC_SELF_IPI, vector);
 173 }
 174
 175 static void init_x2apic_ldr(void)
 176 {
 177 }
 178
 179 struct apic apic_x2apic_phys = {
 180
 181         .name                           = "physical x2apic",
 182         .probe                          = NULL,
 183         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 184         .apic_id_registered             = x2apic_apic_id_registered,
 185
 186         .irq_delivery_mode              = dest_Fixed,
 187         .irq_dest_mode                  = 0, /* physical */
 188
 189         .target_cpus                    = x2apic_target_cpus,
 190         .disable_esr                    = 0,
 191         .dest_logical                   = 0,
 192         .check_apicid_used              = NULL,
 193         .check_apicid_present           = NULL,
 194
 195         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 196         .init_apic_ldr                  = init_x2apic_ldr,
 197
 198         .ioapic_phys_id_map             = NULL,
 199         .setup_apic_routing             = NULL,
 200         .multi_timer_check              = NULL,
 201         .apicid_to_node                 = NULL,
 202         .cpu_to_logical_apicid          = NULL,
 203         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 204         .apicid_to_cpu_present          = NULL,
 205         .setup_portio_remap             = NULL,
 206         .check_phys_apicid_present      = default_check_phys_apicid_present,
 207         .enable_apic_mode               = NULL,
 208         .phys_pkg_id                    = x2apic_phys_pkg_id,
 209         .mps_oem_check                  = NULL,
 210
 211         .get_apic_id                    = x2apic_phys_get_apic_id,
 212         .set_apic_id                    = set_apic_id,
 213         .apic_id_mask                   = 0xFFFFFFFFu,
 214
 215         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 216         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 217
 218         .send_IPI_mask                  = x2apic_send_IPI_mask,
 219         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 220         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 221         .send_IPI_all                   = x2apic_send_IPI_all,
 222         .send_IPI_self                  = x2apic_send_IPI_self,
 223
 224         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 225         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 226         .wait_for_init_deassert         = NULL,
 227         .smp_callin_clear_local_apic    = NULL,
 228         .inquire_remote_apic            = NULL,
 229
 230         .read                           = native_apic_msr_read,
 231         .write                          = native_apic_msr_write,
 232         .icr_read                       = native_x2apic_icr_read,
 233         .icr_write                      = native_x2apic_icr_write,
 234         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 235         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 236 };