arch/x86/kernel/apic/x2apic_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/apic.h>
  11 #include <asm/ipi.h>
  12
  13 static 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         return x2apic_enabled();
  18 }
  19
  20 /*
  21  * need to use more than cpu 0, because we need more vectors when
  22  * MSI-X are used.
  23  */
  24 static const struct cpumask *x2apic_target_cpus(void)
  25 {
  26         return cpu_online_mask;
  27 }
  28
  29 /*
  30  * for now each logical cpu is in its own vector allocation domain.
  31  */
  32 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
  33 {
  34         cpumask_clear(retmask);
  35         cpumask_set_cpu(cpu, retmask);
  36 }
  37
  38 static void
  39  __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
  40 {
  41         unsigned long cfg;
  42
  43         cfg = __prepare_ICR(0, vector, dest);
  44
  45         /*
  46          * send the IPI.
  47          */
  48         native_x2apic_icr_write(cfg, apicid);
  49 }
  50
  51 /*
  52  * for now, we send the IPI's one by one in the cpumask.
  53  * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
  54  * at once. We have 16 cpu's in a cluster. This will minimize IPI register
  55  * writes.
  56  */
  57 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  58 {
  59         unsigned long query_cpu;
  60         unsigned long flags;
  61
  62         x2apic_wrmsr_fence();
  63
  64         local_irq_save(flags);
  65         for_each_cpu(query_cpu, mask) {
  66                 __x2apic_send_IPI_dest(
  67                         per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  68                         vector, apic->dest_logical);
  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                         continue;
  86                 __x2apic_send_IPI_dest(
  87                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  88                                 vector, apic->dest_logical);
  89         }
  90         local_irq_restore(flags);
  91 }
  92
  93 static void x2apic_send_IPI_allbutself(int vector)
  94 {
  95         unsigned long this_cpu = smp_processor_id();
  96         unsigned long query_cpu;
  97         unsigned long flags;
  98
  99         x2apic_wrmsr_fence();
 100
 101         local_irq_save(flags);
 102         for_each_online_cpu(query_cpu) {
 103                 if (query_cpu == this_cpu)
 104                         continue;
 105                 __x2apic_send_IPI_dest(
 106                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
 107                                 vector, apic->dest_logical);
 108         }
 109         local_irq_restore(flags);
 110 }
 111
 112 static void x2apic_send_IPI_all(int vector)
 113 {
 114         x2apic_send_IPI_mask(cpu_online_mask, vector);
 115 }
 116
 117 static int x2apic_apic_id_registered(void)
 118 {
 119         return 1;
 120 }
 121
 122 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 123 {
 124         /*
 125          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 126          * May as well be the first.
 127          */
 128         int cpu = cpumask_first(cpumask);
 129
 130         if ((unsigned)cpu < nr_cpu_ids)
 131                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 132         else
 133                 return BAD_APICID;
 134 }
 135
 136 static unsigned int
 137 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 138                               const struct cpumask *andmask)
 139 {
 140         int cpu;
 141
 142         /*
 143          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 144          * May as well be the first.
 145          */
 146         for_each_cpu_and(cpu, cpumask, andmask) {
 147                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 148                         break;
 149         }
 150
 151         if (cpu < nr_cpu_ids)
 152                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 153
 154         return BAD_APICID;
 155 }
 156
 157 static unsigned int x2apic_cluster_phys_get_apic_id(unsigned long x)
 158 {
 159         unsigned int id;
 160
 161         id = x;
 162         return id;
 163 }
 164
 165 static unsigned long set_apic_id(unsigned int id)
 166 {
 167         unsigned long x;
 168
 169         x = id;
 170         return x;
 171 }
 172
 173 static int x2apic_cluster_phys_pkg_id(int initial_apicid, int index_msb)
 174 {
 175         return initial_apicid >> index_msb;
 176 }
 177
 178 static void x2apic_send_IPI_self(int vector)
 179 {
 180         apic_write(APIC_SELF_IPI, vector);
 181 }
 182
 183 static void init_x2apic_ldr(void)
 184 {
 185         int cpu = smp_processor_id();
 186
 187         per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 188 }
 189
 190 struct apic apic_x2apic_cluster = {
 191
 192         .name                           = "cluster x2apic",
 193         .probe                          = NULL,
 194         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 195         .apic_id_registered             = x2apic_apic_id_registered,
 196
 197         .irq_delivery_mode              = dest_LowestPrio,
 198         .irq_dest_mode                  = 1, /* logical */
 199
 200         .target_cpus                    = x2apic_target_cpus,
 201         .disable_esr                    = 0,
 202         .dest_logical                   = APIC_DEST_LOGICAL,
 203         .check_apicid_used              = NULL,
 204         .check_apicid_present           = NULL,
 205
 206         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 207         .init_apic_ldr                  = init_x2apic_ldr,
 208
 209         .ioapic_phys_id_map             = NULL,
 210         .setup_apic_routing             = NULL,
 211         .multi_timer_check              = NULL,
 212         .apicid_to_node                 = NULL,
 213         .cpu_to_logical_apicid          = NULL,
 214         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 215         .apicid_to_cpu_present          = NULL,
 216         .setup_portio_remap             = NULL,
 217         .check_phys_apicid_present      = default_check_phys_apicid_present,
 218         .enable_apic_mode               = NULL,
 219         .phys_pkg_id                    = x2apic_cluster_phys_pkg_id,
 220         .mps_oem_check                  = NULL,
 221
 222         .get_apic_id                    = x2apic_cluster_phys_get_apic_id,
 223         .set_apic_id                    = set_apic_id,
 224         .apic_id_mask                   = 0xFFFFFFFFu,
 225
 226         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 227         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 228
 229         .send_IPI_mask                  = x2apic_send_IPI_mask,
 230         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 231         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 232         .send_IPI_all                   = x2apic_send_IPI_all,
 233         .send_IPI_self                  = x2apic_send_IPI_self,
 234
 235         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 236         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 237         .wait_for_init_deassert         = NULL,
 238         .smp_callin_clear_local_apic    = NULL,
 239         .inquire_remote_apic            = NULL,
 240
 241         .read                           = native_apic_msr_read,
 242         .write                          = native_apic_msr_write,
 243         .icr_read                       = native_x2apic_icr_read,
 244         .icr_write                      = native_x2apic_icr_write,
 245         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 246         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 247 };