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         int cpu = cpumask_first(cpumask);
 102         u32 dest = 0;
 103         int i;
 104
 105         if (cpu > nr_cpu_ids)
 106                 return BAD_APICID;
 107
 108         for_each_cpu_and(i, cpumask, per_cpu(cpus_in_cluster, cpu))
 109                 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
 110
 111         return dest;
 112 }
 113
 114 static unsigned int
 115 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 116                               const struct cpumask *andmask)
 117 {
 118         u32 dest = 0;
 119         u16 cluster;
 120         int i;
 121
 122         for_each_cpu_and(i, cpumask, andmask) {
 123                 if (!cpumask_test_cpu(i, cpu_online_mask))
 124                         continue;
 125                 dest = per_cpu(x86_cpu_to_logical_apicid, i);
 126                 cluster = x2apic_cluster(i);
 127                 break;
 128         }
 129
 130         if (!dest)
 131                 return BAD_APICID;
 132
 133         for_each_cpu_and(i, cpumask, andmask) {
 134                 if (!cpumask_test_cpu(i, cpu_online_mask))
 135                         continue;
 136                 if (cluster != x2apic_cluster(i))
 137                         continue;
 138                 dest |= per_cpu(x86_cpu_to_logical_apicid, i);
 139         }
 140
 141         return dest;
 142 }
 143
 144 static void init_x2apic_ldr(void)
 145 {
 146         unsigned int this_cpu = smp_processor_id();
 147         unsigned int cpu;
 148
 149         per_cpu(x86_cpu_to_logical_apicid, this_cpu) = apic_read(APIC_LDR);
 150
 151         __cpu_set(this_cpu, per_cpu(cpus_in_cluster, this_cpu));
 152         for_each_online_cpu(cpu) {
 153                 if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
 154                         continue;
 155                 __cpu_set(this_cpu, per_cpu(cpus_in_cluster, cpu));
 156                 __cpu_set(cpu, per_cpu(cpus_in_cluster, this_cpu));
 157         }
 158 }
 159
 160  /*
 161   * At CPU state changes, update the x2apic cluster sibling info.
 162   */
 163 static int __cpuinit
 164 update_clusterinfo(struct notifier_block *nfb, unsigned long action, void *hcpu)
 165 {
 166         unsigned int this_cpu = (unsigned long)hcpu;
 167         unsigned int cpu;
 168         int err = 0;
 169
 170         switch (action) {
 171         case CPU_UP_PREPARE:
 172                 if (!zalloc_cpumask_var(&per_cpu(cpus_in_cluster, this_cpu),
 173                                         GFP_KERNEL)) {
 174                         err = -ENOMEM;
 175                 } else if (!zalloc_cpumask_var(&per_cpu(ipi_mask, this_cpu),
 176                                                GFP_KERNEL)) {
 177                         free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
 178                         err = -ENOMEM;
 179                 }
 180                 break;
 181         case CPU_UP_CANCELED:
 182         case CPU_UP_CANCELED_FROZEN:
 183         case CPU_DEAD:
 184                 for_each_online_cpu(cpu) {
 185                         if (x2apic_cluster(this_cpu) != x2apic_cluster(cpu))
 186                                 continue;
 187                         __cpu_clear(this_cpu, per_cpu(cpus_in_cluster, cpu));
 188                         __cpu_clear(cpu, per_cpu(cpus_in_cluster, this_cpu));
 189                 }
 190                 free_cpumask_var(per_cpu(cpus_in_cluster, this_cpu));
 191                 free_cpumask_var(per_cpu(ipi_mask, this_cpu));
 192                 break;
 193         }
 194
 195         return notifier_from_errno(err);
 196 }
 197
 198 static struct notifier_block __refdata x2apic_cpu_notifier = {
 199         .notifier_call = update_clusterinfo,
 200 };
 201
 202 static int x2apic_init_cpu_notifier(void)
 203 {
 204         int cpu = smp_processor_id();
 205
 206         zalloc_cpumask_var(&per_cpu(cpus_in_cluster, cpu), GFP_KERNEL);
 207         zalloc_cpumask_var(&per_cpu(ipi_mask, cpu), GFP_KERNEL);
 208
 209         BUG_ON(!per_cpu(cpus_in_cluster, cpu) || !per_cpu(ipi_mask, cpu));
 210
 211         __cpu_set(cpu, per_cpu(cpus_in_cluster, cpu));
 212         register_hotcpu_notifier(&x2apic_cpu_notifier);
 213         return 1;
 214 }
 215
 216 static int x2apic_cluster_probe(void)
 217 {
 218         if (x2apic_mode)
 219                 return x2apic_init_cpu_notifier();
 220         else
 221                 return 0;
 222 }
 223
 224 /*
 225  * Each x2apic cluster is an allocation domain.
 226  */
 227 static void cluster_vector_allocation_domain(int cpu, struct cpumask *retmask)
 228 {
 229         cpumask_clear(retmask);
 230         cpumask_copy(retmask, per_cpu(cpus_in_cluster, cpu));
 231 }
 232
 233 static struct apic apic_x2apic_cluster = {
 234
 235         .name                           = "cluster x2apic",
 236         .probe                          = x2apic_cluster_probe,
 237         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 238         .apic_id_valid                  = x2apic_apic_id_valid,
 239         .apic_id_registered             = x2apic_apic_id_registered,
 240
 241         .irq_delivery_mode              = dest_LowestPrio,
 242         .irq_dest_mode                  = 1, /* logical */
 243
 244         .target_cpus                    = x2apic_target_cpus,
 245         .disable_esr                    = 0,
 246         .dest_logical                   = APIC_DEST_LOGICAL,
 247         .check_apicid_used              = NULL,
 248         .check_apicid_present           = NULL,
 249
 250         .vector_allocation_domain       = cluster_vector_allocation_domain,
 251         .init_apic_ldr                  = init_x2apic_ldr,
 252
 253         .ioapic_phys_id_map             = NULL,
 254         .setup_apic_routing             = NULL,
 255         .multi_timer_check              = NULL,
 256         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 257         .apicid_to_cpu_present          = NULL,
 258         .setup_portio_remap             = NULL,
 259         .check_phys_apicid_present      = default_check_phys_apicid_present,
 260         .enable_apic_mode               = NULL,
 261         .phys_pkg_id                    = x2apic_phys_pkg_id,
 262         .mps_oem_check                  = NULL,
 263
 264         .get_apic_id                    = x2apic_get_apic_id,
 265         .set_apic_id                    = x2apic_set_apic_id,
 266         .apic_id_mask                   = 0xFFFFFFFFu,
 267
 268         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 269         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 270
 271         .send_IPI_mask                  = x2apic_send_IPI_mask,
 272         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 273         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 274         .send_IPI_all                   = x2apic_send_IPI_all,
 275         .send_IPI_self                  = x2apic_send_IPI_self,
 276
 277         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 278         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 279         .wait_for_init_deassert         = NULL,
 280         .smp_callin_clear_local_apic    = NULL,
 281         .inquire_remote_apic            = NULL,
 282
 283         .read                           = native_apic_msr_read,
 284         .write                          = native_apic_msr_write,
 285         .eoi_write                      = native_apic_msr_eoi_write,
 286         .icr_read                       = native_x2apic_icr_read,
 287         .icr_write                      = native_x2apic_icr_write,
 288         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 289         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 290 };
 291
 292 apic_driver(apic_x2apic_cluster);