arch/x86/kernel/genx2apic_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/ipi.h>
  11 #include <asm/genapic.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         if (cpu_has_x2apic)
  18                 return 1;
  19
  20         return 0;
  21 }
  22
  23 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
  24
  25 static const struct cpumask *x2apic_target_cpus(void)
  26 {
  27         return cpumask_of(0);
  28 }
  29
  30 /*
  31  * for now each logical cpu is in its own vector allocation domain.
  32  */
  33 static void x2apic_vector_allocation_domain(int cpu, struct cpumask *retmask)
  34 {
  35         cpumask_clear(retmask);
  36         cpumask_set_cpu(cpu, retmask);
  37 }
  38
  39 static void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
  40                                    unsigned int dest)
  41 {
  42         unsigned long cfg;
  43
  44         cfg = __prepare_ICR(0, vector, dest);
  45
  46         /*
  47          * send the IPI.
  48          */
  49         x2apic_icr_write(cfg, apicid);
  50 }
  51
  52 /*
  53  * for now, we send the IPI's one by one in the cpumask.
  54  * TBD: Based on the cpu mask, we can send the IPI's to the cluster group
  55  * at once. We have 16 cpu's in a cluster. This will minimize IPI register
  56  * writes.
  57  */
  58 static void x2apic_send_IPI_mask(const struct cpumask *mask, int vector)
  59 {
  60         unsigned long flags;
  61         unsigned long query_cpu;
  62
  63         local_irq_save(flags);
  64         for_each_cpu(query_cpu, mask)
  65                 __x2apic_send_IPI_dest(
  66                         per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  67                         vector, APIC_DEST_LOGICAL);
  68         local_irq_restore(flags);
  69 }
  70
  71 static void x2apic_send_IPI_mask_allbutself(const struct cpumask *mask,
  72                                             int vector)
  73 {
  74         unsigned long flags;
  75         unsigned long query_cpu;
  76         unsigned long this_cpu = smp_processor_id();
  77
  78         local_irq_save(flags);
  79         for_each_cpu(query_cpu, mask)
  80                 if (query_cpu != this_cpu)
  81                         __x2apic_send_IPI_dest(
  82                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  83                                 vector, APIC_DEST_LOGICAL);
  84         local_irq_restore(flags);
  85 }
  86
  87 static void x2apic_send_IPI_allbutself(int vector)
  88 {
  89         unsigned long flags;
  90         unsigned long query_cpu;
  91         unsigned long this_cpu = smp_processor_id();
  92
  93         local_irq_save(flags);
  94         for_each_online_cpu(query_cpu)
  95                 if (query_cpu != this_cpu)
  96                         __x2apic_send_IPI_dest(
  97                                 per_cpu(x86_cpu_to_logical_apicid, query_cpu),
  98                                 vector, APIC_DEST_LOGICAL);
  99         local_irq_restore(flags);
 100 }
 101
 102 static void x2apic_send_IPI_all(int vector)
 103 {
 104         x2apic_send_IPI_mask(cpu_online_mask, vector);
 105 }
 106
 107 static int x2apic_apic_id_registered(void)
 108 {
 109         return 1;
 110 }
 111
 112 static unsigned int x2apic_cpu_mask_to_apicid(const struct cpumask *cpumask)
 113 {
 114         int cpu;
 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         cpu = cpumask_first(cpumask);
 121         if ((unsigned)cpu < nr_cpu_ids)
 122                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 123         else
 124                 return BAD_APICID;
 125 }
 126
 127 static unsigned int x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 128                                                   const struct cpumask *andmask)
 129 {
 130         int cpu;
 131
 132         /*
 133          * We're using fixed IRQ delivery, can only return one logical APIC ID.
 134          * May as well be the first.
 135          */
 136         for_each_cpu_and(cpu, cpumask, andmask)
 137                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 138                         break;
 139         if (cpu < nr_cpu_ids)
 140                 return per_cpu(x86_cpu_to_logical_apicid, cpu);
 141         return BAD_APICID;
 142 }
 143
 144 static unsigned int get_apic_id(unsigned long x)
 145 {
 146         unsigned int id;
 147
 148         id = x;
 149         return id;
 150 }
 151
 152 static unsigned long set_apic_id(unsigned int id)
 153 {
 154         unsigned long x;
 155
 156         x = id;
 157         return x;
 158 }
 159
 160 static unsigned int phys_pkg_id(int index_msb)
 161 {
 162         return current_cpu_data.initial_apicid >> index_msb;
 163 }
 164
 165 static void x2apic_send_IPI_self(int vector)
 166 {
 167         apic_write(APIC_SELF_IPI, vector);
 168 }
 169
 170 static void init_x2apic_ldr(void)
 171 {
 172         int cpu = smp_processor_id();
 173
 174         per_cpu(x86_cpu_to_logical_apicid, cpu) = apic_read(APIC_LDR);
 175         return;
 176 }
 177
 178 struct genapic apic_x2apic_cluster = {
 179         .name = "cluster x2apic",
 180         .acpi_madt_oem_check = x2apic_acpi_madt_oem_check,
 181         .int_delivery_mode = dest_LowestPrio,
 182         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
 183         .target_cpus = x2apic_target_cpus,
 184         .vector_allocation_domain = x2apic_vector_allocation_domain,
 185         .apic_id_registered = x2apic_apic_id_registered,
 186         .init_apic_ldr = init_x2apic_ldr,
 187         .send_IPI_all = x2apic_send_IPI_all,
 188         .send_IPI_allbutself = x2apic_send_IPI_allbutself,
 189         .send_IPI_mask = x2apic_send_IPI_mask,
 190         .send_IPI_mask_allbutself = x2apic_send_IPI_mask_allbutself,
 191         .send_IPI_self = x2apic_send_IPI_self,
 192         .cpu_mask_to_apicid = x2apic_cpu_mask_to_apicid,
 193         .cpu_mask_to_apicid_and = x2apic_cpu_mask_to_apicid_and,
 194         .phys_pkg_id = phys_pkg_id,
 195         .get_apic_id = get_apic_id,
 196         .set_apic_id = set_apic_id,
 197         .apic_id_mask = (0xFFFFFFFFu),
 198 };