git.oblomov.eu Git - linux-2.6/blob - arch/x86/kernel/genx2apic_cluster.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/ipi.h>
  11 #include <asm/genapic.h>
  12
  13 DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
  14
  15 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  16 {
  17         if (cpu_has_x2apic)
  18                 return 1;
  19
  20         return 0;
  21 }
  22
  23 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
  24
  25 static const struct cpumask *x2apic_target_cpus(void)
  26 {
  27         return cpumask_of(0);
  28 }
  29
  30 /*
  31  * for now each logical cpu is in its own vector allocation domain.
  32  */
  33 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
  34 {
  35         cpumask_clear(retmask);
  36         cpumask_set_cpu(cpu, retmask);
  37 }
  38
  39 static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
  40                                    unsigned int dest)
  41 {
  42         unsigned long cfg;
  43
  44         cfg = __prepare_ICR(0, vector, dest);
  45
  46         /*
  47          * send the IPI.
  48          */
  49         x2apic_icr_write(cfg, apicid);
  50 }
  51
  52 /*
  53  * for now, we send the IPI's one by one in the cpumask.
  54  * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
  55  * at once. We have 16 cpu's in a cluster. This will minimize IPI register
  56  * writes.
  57  */
  58 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  59 {
  60         unsigned long flags;
  61         unsigned long query_cpu;
  62
  63         local_irq_save(flags);
  64         for_each_cpu(query_cpu, mask)
  65                 __x2apic_send_IPI_dest(
  66                         per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  67                         vector, apic->dest_logical);
  68         local_irq_restore(flags);
  69 }
  70
  71 static void x2apic_send_IPI_mask_allbutself(const struct cpumask *mask,
  72                                             int vector)
  73 {
  74         unsigned long flags;
  75         unsigned long query_cpu;
  76         unsigned long this_cpu = smp_processor_id();
  77
  78         local_irq_save(flags);
  79         for_each_cpu(query_cpu, mask)
  80                 if (query_cpu != this_cpu)
  81                         __x2apic_send_IPI_dest(
  82                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  83                                 vector, apic->dest_logical);
  84         local_irq_restore(flags);
  85 }
  86
  87 static void x2apic_send_IPI_allbutself(int vector)
  88 {
  89         unsigned long flags;
  90         unsigned long query_cpu;
  91         unsigned long this_cpu = smp_processor_id();
  92
  93         local_irq_save(flags);
  94         for_each_online_cpu(query_cpu)
  95                 if (query_cpu != this_cpu)
  96                         __x2apic_send_IPI_dest(
  97                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  98                                 vector, apic->dest_logical);
  99         local_irq_restore(flags);
 100 }
 101
 102 static void x2apic_send_IPI_all(int vector)
 103 {
 104         x2apic_send_IPI_mask(cpu_online_mask, vector);
 105 }
 106
 107 static int x2apic_apic_id_registered(void)
 108 {
 109         return 1;
 110 }
 111
 112 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 113 {
 114         /*
 115          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 116          * May as well be the first.
 117          */
 118         int cpu = cpumask_first(cpumask);
 119
 120         if ((unsigned)cpu < nr_cpu_ids)
 121                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 122         else
 123                 return BAD_APICID;
 124 }
 125
 126 static unsigned int
 127 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 128                               const struct cpumask *andmask)
 129 {
 130         int cpu;
 131
 132         /*
 133          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 134          * May as well be the first.
 135          */
 136         for_each_cpu_and(cpu, cpumask, andmask) {
 137                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 138                         break;
 139         }
 140
 141         if (cpu < nr_cpu_ids)
 142                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 143
 144         return BAD_APICID;
 145 }
 146
 147 static unsigned int x2apic_cluster_phys_get_apic_id(unsigned long x)
 148 {
 149         unsigned int id;
 150
 151         id = x;
 152         return id;
 153 }
 154
 155 static unsigned long set_apic_id(unsigned int id)
 156 {
 157         unsigned long x;
 158
 159         x = id;
 160         return x;
 161 }
 162
 163 static int x2apic_cluster_phys_pkg_id(int initial_apicid, int index_msb)
 164 {
 165         return current_cpu_data.initial_apicid >> index_msb;
 166 }
 167
 168 static void x2apic_send_IPI_self(int vector)
 169 {
 170         apic_write(APIC_SELF_IPI, vector);
 171 }
 172
 173 static void init_x2apic_ldr(void)
 174 {
 175         int cpu = smp_processor_id();
 176
 177         per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 178         return;
 179 }
 180
 181 struct genapic apic_x2apic_cluster = {
 182
 183         .name                           = "cluster x2apic",
 184         .probe                          = NULL,
 185         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 186         .apic_id_registered             = x2apic_apic_id_registered,
 187
 188         .irq_delivery_mode              = dest_LowestPrio,
 189         .irq_dest_mode                  = 1, /* logical */
 190
 191         .target_cpus                    = x2apic_target_cpus,
 192         .disable_esr                    = 0,
 193         .dest_logical                   = APIC_DEST_LOGICAL,
 194         .check_apicid_used              = NULL,
 195         .check_apicid_present           = NULL,
 196
 197         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 198         .init_apic_ldr                  = init_x2apic_ldr,
 199
 200         .ioapic_phys_id_map             = NULL,
 201         .setup_apic_routing             = NULL,
 202         .multi_timer_check              = NULL,
 203         .apicid_to_node                 = NULL,
 204         .cpu_to_logical_apicid          = NULL,
 205         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 206         .apicid_to_cpu_present          = NULL,
 207         .setup_portio_remap             = NULL,
 208         .check_phys_apicid_present      = default_check_phys_apicid_present,
 209         .enable_apic_mode               = NULL,
 210         .phys_pkg_id                    = x2apic_cluster_phys_pkg_id,
 211         .mps_oem_check                  = NULL,
 212
 213         .get_apic_id                    = x2apic_cluster_phys_get_apic_id,
 214         .set_apic_id                    = set_apic_id,
 215         .apic_id_mask                   = 0xFFFFFFFFu,
 216
 217         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 218         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 219
 220         .send_IPI_mask                  = x2apic_send_IPI_mask,
 221         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 222         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 223         .send_IPI_all                   = x2apic_send_IPI_all,
 224         .send_IPI_self                  = x2apic_send_IPI_self,
 225
 226         .wakeup_cpu                     = NULL,
 227         .trampoline_phys_low            = 0,
 228         .trampoline_phys_high           = 0,
 229         .wait_for_init_deassert         = NULL,
 230         .smp_callin_clear_local_apic    = NULL,
 231         .store_NMI_vector               = NULL,
 232         .restore_NMI_vector             = NULL,
 233         .inquire_remote_apic            = NULL,
 234 };