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 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
  21
  22 static const struct cpumask *x2apic_target_cpus(void)
  23 {
  24         return cpumask_of(0);
  25 }
  26
  27 /*
  28  * for now each logical cpu is in its own vector allocation domain.
  29  */
  30 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
  31 {
  32         cpumask_clear(retmask);
  33         cpumask_set_cpu(cpu, retmask);
  34 }
  35
  36 static void
  37  __x2apic_send_IPI_dest(unsigned int apicid, int vector, unsigned int dest)
  38 {
  39         unsigned long cfg;
  40
  41         cfg = __prepare_ICR(0, vector, dest);
  42
  43         /*
  44          * send the IPI.
  45          */
  46         native_x2apic_icr_write(cfg, apicid);
  47 }
  48
  49 /*
  50  * for now, we send the IPI's one by one in the cpumask.
  51  * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
  52  * at once. We have 16 cpu's in a cluster. This will minimize IPI register
  53  * writes.
  54  */
  55 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  56 {
  57         unsigned long query_cpu;
  58         unsigned long flags;
  59
  60         x2apic_wrmsr_fence();
  61
  62         local_irq_save(flags);
  63         for_each_cpu(query_cpu, mask) {
  64                 __x2apic_send_IPI_dest(
  65                         per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  66                         vector, apic->dest_logical);
  67         }
  68         local_irq_restore(flags);
  69 }
  70
  71 static void
  72  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  73 {
  74         unsigned long this_cpu = smp_processor_id();
  75         unsigned long query_cpu;
  76         unsigned long flags;
  77
  78         x2apic_wrmsr_fence();
  79
  80         local_irq_save(flags);
  81         for_each_cpu(query_cpu, mask) {
  82                 if (query_cpu == this_cpu)
  83                         continue;
  84                 __x2apic_send_IPI_dest(
  85                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  86                                 vector, apic->dest_logical);
  87         }
  88         local_irq_restore(flags);
  89 }
  90
  91 static void x2apic_send_IPI_allbutself(int vector)
  92 {
  93         unsigned long this_cpu = smp_processor_id();
  94         unsigned long query_cpu;
  95         unsigned long flags;
  96
  97         x2apic_wrmsr_fence();
  98
  99         local_irq_save(flags);
 100         for_each_online_cpu(query_cpu) {
 101                 if (query_cpu == this_cpu)
 102                         continue;
 103                 __x2apic_send_IPI_dest(
 104                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
 105                                 vector, apic->dest_logical);
 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 logical 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_logical_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 logical 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_logical_apicid, cpu);
 151
 152         return BAD_APICID;
 153 }
 154
 155 static unsigned int x2apic_cluster_phys_get_apic_id(unsigned long x)
 156 {
 157         unsigned int id;
 158
 159         id = x;
 160         return id;
 161 }
 162
 163 static unsigned long set_apic_id(unsigned int id)
 164 {
 165         unsigned long x;
 166
 167         x = id;
 168         return x;
 169 }
 170
 171 static int x2apic_cluster_phys_pkg_id(int initial_apicid, int index_msb)
 172 {
 173         return initial_apicid >> index_msb;
 174 }
 175
 176 static void x2apic_send_IPI_self(int vector)
 177 {
 178         apic_write(APIC_SELF_IPI, vector);
 179 }
 180
 181 static void init_x2apic_ldr(void)
 182 {
 183         int cpu = smp_processor_id();
 184
 185         per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 186 }
 187
 188 struct apic apic_x2apic_cluster = {
 189
 190         .name                           = "cluster x2apic",
 191         .probe                          = NULL,
 192         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 193         .apic_id_registered             = x2apic_apic_id_registered,
 194
 195         .irq_delivery_mode              = dest_LowestPrio,
 196         .irq_dest_mode                  = 1, /* logical */
 197
 198         .target_cpus                    = x2apic_target_cpus,
 199         .disable_esr                    = 0,
 200         .dest_logical                   = APIC_DEST_LOGICAL,
 201         .check_apicid_used              = NULL,
 202         .check_apicid_present           = NULL,
 203
 204         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 205         .init_apic_ldr                  = init_x2apic_ldr,
 206
 207         .ioapic_phys_id_map             = NULL,
 208         .setup_apic_routing             = NULL,
 209         .multi_timer_check              = NULL,
 210         .apicid_to_node                 = NULL,
 211         .cpu_to_logical_apicid          = NULL,
 212         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 213         .apicid_to_cpu_present          = NULL,
 214         .setup_portio_remap             = NULL,
 215         .check_phys_apicid_present      = default_check_phys_apicid_present,
 216         .enable_apic_mode               = NULL,
 217         .phys_pkg_id                    = x2apic_cluster_phys_pkg_id,
 218         .mps_oem_check                  = NULL,
 219
 220         .get_apic_id                    = x2apic_cluster_phys_get_apic_id,
 221         .set_apic_id                    = set_apic_id,
 222         .apic_id_mask                   = 0xFFFFFFFFu,
 223
 224         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 225         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 226
 227         .send_IPI_mask                  = x2apic_send_IPI_mask,
 228         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 229         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 230         .send_IPI_all                   = x2apic_send_IPI_all,
 231         .send_IPI_self                  = x2apic_send_IPI_self,
 232
 233         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 234         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 235         .wait_for_init_deassert         = NULL,
 236         .smp_callin_clear_local_apic    = NULL,
 237         .inquire_remote_apic            = NULL,
 238
 239         .read                           = native_apic_msr_read,
 240         .write                          = native_apic_msr_write,
 241         .icr_read                       = native_x2apic_icr_read,
 242         .icr_write                      = native_x2apic_icr_write,
 243         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 244         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 245 };