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 #include <linux/cpu.h>
   9
  10 #include <asm/smp.h>
  11 #include <asm/x2apic.h>
  12
  13 static DEFINE_PER_CPU(u32, x86_cpu_to_logical_apicid);
  14 static DEFINE_PER_CPU(cpumask_var_t, cpus_in_cluster);
  15 static DEFINE_PER_CPU(cpumask_var_t, ipi_mask);
  16
  17 static int x2apic_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  18 {
  19         return x2apic_enabled();
  20 }
  21
  22 static inline u32 x2apic_cluster(int cpu)
  23 {
  24         return per_cpu(x86_cpu_to_logical_apicid, cpu) >> 16;
  25 }
  26
  27 static void
  28 __x2apic_send_IPI_mask(const struct cpumask *mask, int vector, int apic_dest)
  29 {
  30         struct cpumask *cpus_in_cluster_ptr;
  31         struct cpumask *ipi_mask_ptr;
  32         unsigned int cpu, this_cpu;
  33         unsigned long flags;
  34         u32 dest;
  35
  36         x2apic_wrmsr_fence();
  37
  38         local_irq_save(flags);
  39
  40         this_cpu = smp_processor_id();
  41
  42         /*
  43          * We are to modify mask, so we need an own copy
  44          * and be sure it's manipulated with irq off.
  45          */
  46         ipi_mask_ptr = __raw_get_cpu_var(ipi_mask);
  47         cpumask_copy(ipi_mask_ptr, mask);
  48
  49         /*
  50          * The idea is to send one IPI per cluster.
  51          */
  52         for_each_cpu(cpu, ipi_mask_ptr) {
  53                 unsigned long i;
  54
  55                 cpus_in_cluster_ptr = per_cpu(cpus_in_cluster, cpu);
  56                 dest = 0;
  57
  58                 /* Collect cpus in cluster. */
  59                 for_each_cpu_and(i, ipi_mask_ptr, cpus_in_cluster_ptr) {
  60                         if (apic_dest == APIC_DEST_ALLINC || i != this_cpu)
  61                                 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
  62                 }
  63
  64                 if (!dest)
  65                         continue;
  66
  67                 __x2apic_send_IPI_dest(dest, vector, apic->dest_logical);
  68                 /*
  69                  * Cluster sibling cpus should be discared now so
  70                  * we would not send IPI them second time.
  71                  */
  72                 cpumask_andnot(ipi_mask_ptr, ipi_mask_ptr, cpus_in_cluster_ptr);
  73         }
  74
  75         local_irq_restore(flags);
  76 }
  77
  78 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  79 {
  80         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLINC);
  81 }
  82
  83 static void
  84  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  85 {
  86         __x2apic_send_IPI_mask(mask, vector, APIC_DEST_ALLBUT);
  87 }
  88
  89 static void x2apic_send_IPI_allbutself(int vector)
  90 {
  91         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLBUT);
  92 }
  93
  94 static void x2apic_send_IPI_all(int vector)
  95 {
  96         __x2apic_send_IPI_mask(cpu_online_mask, vector, APIC_DEST_ALLINC);
  97 }
  98
  99 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 100 {
 101         /*
 102          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 103          * May as well be the first.
 104          */
 105         int cpu = cpumask_first(cpumask);
 106
 107         if ((unsigned)cpu < nr_cpu_ids)
 108                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 109         else
 110                 return BAD_APICID;
 111 }
 112
 113 static unsigned int
 114 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 115                               const struct cpumask *andmask)
 116 {
 117         int cpu;
 118
 119         /*
 120          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 121          * May as well be the first.
 122          */
 123         for_each_cpu_and(cpu, cpumask, andmask) {
 124                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 125                         break;
 126         }
 127
 128         return per_cpu(x86_cpu_to_logical_apicid, cpu);
 129 }
 130
 131 static void init_x2apic_ldr(void)
 132 {
 133         unsigned int this_cpu = smp_processor_id();
 134         unsigned int cpu;
 135
 136         per_cpu(x86_cpu_to_logical_apicid, this_cpu) = apic_read(APIC_LDR);
 137
 138         __cpu_set(this_cpu, per_cpu(cpus_in_cluster, this_cpu));
 139         for_each_online_cpu(cpu) {
 140                 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
 141                         continue;
 142                 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, cpu));
 143                 __cpu_set(cpu, per_cpu(cpus_in_cluster, this_cpu));
 144         }
 145 }
 146
 147  /*
 148   * At CPU state changes, update the x2apic cluster sibling info.
 149   */
 150 static int __cpuinit
 151 update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
 152 {
 153         unsigned int this_cpu = (unsigned long)hcpu;
 154         unsigned int cpu;
 155         int err = 0;
 156
 157         switch (action) {
 158         case CPU_UP_PREPARE:
 159                 if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
 160                                         GFP_KERNEL)) {
 161                         err = -ENOMEM;
 162                 } else if (!zalloc_cpumask_var(&per_cpu(ipi_mask, this_cpu),
 163                                                GFP_KERNEL)) {
 164                         free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
 165                         err = -ENOMEM;
 166                 }
 167                 break;
 168         case CPU_UP_CANCELED:
 169         case CPU_UP_CANCELED_FROZEN:
 170         case CPU_DEAD:
 171                 for_each_online_cpu(cpu) {
 172                         if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
 173                                 continue;
 174                         __cpu_clear(this_cpu, per_cpu(cpus_in_cluster, cpu));
 175                         __cpu_clear(cpu, per_cpu(cpus_in_cluster, this_cpu));
 176                 }
 177                 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
 178                 free_cpumask_var(per_cpu(ipi_mask, this_cpu));
 179                 break;
 180         }
 181
 182         return notifier_from_errno(err);
 183 }
 184
 185 static struct notifier_block __refdata x2apic_cpu_notifier = {
 186         .notifier_call = update_clusterinfo,
 187 };
 188
 189 static int x2apic_init_cpu_notifier(void)
 190 {
 191         int cpu = smp_processor_id();
 192
 193         zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
 194         zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
 195
 196         BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
 197
 198         __cpu_set(cpu, per_cpu(cpus_in_cluster, cpu));
 199         register_hotcpu_notifier(&x2apic_cpu_notifier);
 200         return 1;
 201 }
 202
 203 static int x2apic_cluster_probe(void)
 204 {
 205         if (x2apic_mode)
 206                 return x2apic_init_cpu_notifier();
 207         else
 208                 return 0;
 209 }
 210
 211 static struct apic apic_x2apic_cluster = {
 212
 213         .name                           = "cluster x2apic",
 214         .probe                          = x2apic_cluster_probe,
 215         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 216         .apic_id_registered             = x2apic_apic_id_registered,
 217
 218         .irq_delivery_mode              = dest_LowestPrio,
 219         .irq_dest_mode                  = 1, /* logical */
 220
 221         .target_cpus                    = x2apic_target_cpus,
 222         .disable_esr                    = 0,
 223         .dest_logical                   = APIC_DEST_LOGICAL,
 224         .check_apicid_used              = NULL,
 225         .check_apicid_present           = NULL,
 226
 227         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 228         .init_apic_ldr                  = init_x2apic_ldr,
 229
 230         .ioapic_phys_id_map             = NULL,
 231         .setup_apic_routing             = NULL,
 232         .multi_timer_check              = NULL,
 233         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 234         .apicid_to_cpu_present          = NULL,
 235         .setup_portio_remap             = NULL,
 236         .check_phys_apicid_present      = default_check_phys_apicid_present,
 237         .enable_apic_mode               = NULL,
 238         .phys_pkg_id                    = x2apic_phys_pkg_id,
 239         .mps_oem_check                  = NULL,
 240
 241         .get_apic_id                    = x2apic_get_apic_id,
 242         .set_apic_id                    = x2apic_set_apic_id,
 243         .apic_id_mask                   = 0xFFFFFFFFu,
 244
 245         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 246         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 247
 248         .send_IPI_mask                  = x2apic_send_IPI_mask,
 249         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 250         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 251         .send_IPI_all                   = x2apic_send_IPI_all,
 252         .send_IPI_self                  = x2apic_send_IPI_self,
 253
 254         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 255         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 256         .wait_for_init_deassert         = NULL,
 257         .smp_callin_clear_local_apic    = NULL,
 258         .inquire_remote_apic            = NULL,
 259
 260         .read                           = native_apic_msr_read,
 261         .write                          = native_apic_msr_write,
 262         .icr_read                       = native_x2apic_icr_read,
 263         .icr_write                      = native_x2apic_icr_write,
 264         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 265         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 266 };
 267
 268 apic_driver(apic_x2apic_cluster);