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 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         local_irq_save(flags);
  61         for_each_cpu(query_cpu, mask) {
  62                 __x2apic_send_IPI_dest(
  63                         per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  64                         vector, apic->dest_logical);
  65         }
  66         local_irq_restore(flags);
  67 }
  68
  69 static void
  70  x2apic_send_IPI_mask_allbutself(const struct cpumask *mask, int vector)
  71 {
  72         unsigned long this_cpu = smp_processor_id();
  73         unsigned long query_cpu;
  74         unsigned long flags;
  75
  76         local_irq_save(flags);
  77         for_each_cpu(query_cpu, mask) {
  78                 if (query_cpu == this_cpu)
  79                         continue;
  80                 __x2apic_send_IPI_dest(
  81                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  82                                 vector, apic->dest_logical);
  83         }
  84         local_irq_restore(flags);
  85 }
  86
  87 static void x2apic_send_IPI_allbutself(int vector)
  88 {
  89         unsigned long this_cpu = smp_processor_id();
  90         unsigned long query_cpu;
  91         unsigned long flags;
  92
  93         local_irq_save(flags);
  94         for_each_online_cpu(query_cpu) {
  95                 if (query_cpu == this_cpu)
  96                         continue;
  97                 __x2apic_send_IPI_dest(
  98                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  99                                 vector, apic->dest_logical);
 100         }
 101         local_irq_restore(flags);
 102 }
 103
 104 static void x2apic_send_IPI_all(int vector)
 105 {
 106         x2apic_send_IPI_mask(cpu_online_mask, vector);
 107 }
 108
 109 static int x2apic_apic_id_registered(void)
 110 {
 111         return 1;
 112 }
 113
 114 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 115 {
 116         /*
 117          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 118          * May as well be the first.
 119          */
 120         int cpu = cpumask_first(cpumask);
 121
 122         if ((unsigned)cpu < nr_cpu_ids)
 123                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 124         else
 125                 return BAD_APICID;
 126 }
 127
 128 static unsigned int
 129 x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 130                               const struct cpumask *andmask)
 131 {
 132         int cpu;
 133
 134         /*
 135          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 136          * May as well be the first.
 137          */
 138         for_each_cpu_and(cpu, cpumask, andmask) {
 139                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 140                         break;
 141         }
 142
 143         if (cpu < nr_cpu_ids)
 144                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 145
 146         return BAD_APICID;
 147 }
 148
 149 static unsigned int x2apic_cluster_phys_get_apic_id(unsigned long x)
 150 {
 151         unsigned int id;
 152
 153         id = x;
 154         return id;
 155 }
 156
 157 static unsigned long set_apic_id(unsigned int id)
 158 {
 159         unsigned long x;
 160
 161         x = id;
 162         return x;
 163 }
 164
 165 static int x2apic_cluster_phys_pkg_id(int initial_apicid, int index_msb)
 166 {
 167         return current_cpu_data.initial_apicid >> index_msb;
 168 }
 169
 170 static void x2apic_send_IPI_self(int vector)
 171 {
 172         apic_write(APIC_SELF_IPI, vector);
 173 }
 174
 175 static void init_x2apic_ldr(void)
 176 {
 177         int cpu = smp_processor_id();
 178
 179         per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 180 }
 181
 182 struct apic apic_x2apic_cluster = {
 183
 184         .name                           = "cluster x2apic",
 185         .probe                          = NULL,
 186         .acpi_madt_oem_check            = x2apic_acpi_madt_oem_check,
 187         .apic_id_registered             = x2apic_apic_id_registered,
 188
 189         .irq_delivery_mode              = dest_LowestPrio,
 190         .irq_dest_mode                  = 1, /* logical */
 191
 192         .target_cpus                    = x2apic_target_cpus,
 193         .disable_esr                    = 0,
 194         .dest_logical                   = APIC_DEST_LOGICAL,
 195         .check_apicid_used              = NULL,
 196         .check_apicid_present           = NULL,
 197
 198         .vector_allocation_domain       = x2apic_vector_allocation_domain,
 199         .init_apic_ldr                  = init_x2apic_ldr,
 200
 201         .ioapic_phys_id_map             = NULL,
 202         .setup_apic_routing             = NULL,
 203         .multi_timer_check              = NULL,
 204         .apicid_to_node                 = NULL,
 205         .cpu_to_logical_apicid          = NULL,
 206         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
 207         .apicid_to_cpu_present          = NULL,
 208         .setup_portio_remap             = NULL,
 209         .check_phys_apicid_present      = default_check_phys_apicid_present,
 210         .enable_apic_mode               = NULL,
 211         .phys_pkg_id                    = x2apic_cluster_phys_pkg_id,
 212         .mps_oem_check                  = NULL,
 213
 214         .get_apic_id                    = x2apic_cluster_phys_get_apic_id,
 215         .set_apic_id                    = set_apic_id,
 216         .apic_id_mask                   = 0xFFFFFFFFu,
 217
 218         .cpu_mask_to_apicid             = x2apic_cpu_mask_to_apicid,
 219         .cpu_mask_to_apicid_and         = x2apic_cpu_mask_to_apicid_and,
 220
 221         .send_IPI_mask                  = x2apic_send_IPI_mask,
 222         .send_IPI_mask_allbutself       = x2apic_send_IPI_mask_allbutself,
 223         .send_IPI_allbutself            = x2apic_send_IPI_allbutself,
 224         .send_IPI_all                   = x2apic_send_IPI_all,
 225         .send_IPI_self                  = x2apic_send_IPI_self,
 226
 227         .wakeup_cpu                     = wakeup_secondary_cpu_via_init,
 228         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 229         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 230         .wait_for_init_deassert         = NULL,
 231         .smp_callin_clear_local_apic    = NULL,
 232         .inquire_remote_apic            = NULL,
 233
 234         .read                           = native_apic_msr_read,
 235         .write                          = native_apic_msr_write,
 236         .icr_read                       = native_x2apic_icr_read,
 237         .icr_write                      = native_x2apic_icr_write,
 238         .wait_icr_idle                  = native_x2apic_wait_icr_idle,
 239         .safe_wait_icr_idle             = native_safe_x2apic_wait_icr_idle,
 240 };