arch/x86/kernel/genapic_flat_64.c

   1 /*
   2  * Copyright 2004 James Cleverdon, IBM.
   3  * Subject to the GNU Public License, v.2
   4  *
   5  * Flat APIC subarch code.
   6  *
   7  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
   8  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
   9  * James Cleverdon.
  10  */
  11 #include <linux/errno.h>
  12 #include <linux/threads.h>
  13 #include <linux/cpumask.h>
  14 #include <linux/string.h>
  15 #include <linux/kernel.h>
  16 #include <linux/ctype.h>
  17 #include <linux/init.h>
  18 #include <asm/smp.h>
  19 #include <asm/ipi.h>
  20 #include <asm/genapic.h>
  21
  22 static cpumask_t flat_target_cpus(void)
  23 {
  24         return cpu_online_map;
  25 }
  26
  27 static cpumask_t flat_vector_allocation_domain(int cpu)
  28 {
  29         /* Careful. Some cpus do not strictly honor the set of cpus
  30          * specified in the interrupt destination when using lowest
  31          * priority interrupt delivery mode.
  32          *
  33          * In particular there was a hyperthreading cpu observed to
  34          * deliver interrupts to the wrong hyperthread when only one
  35          * hyperthread was specified in the interrupt desitination.
  36          */
  37         cpumask_t domain = { { [0] = APIC_ALL_CPUS, } };
  38         return domain;
  39 }
  40
  41 /*
  42  * Set up the logical destination ID.
  43  *
  44  * Intel recommends to set DFR, LDR and TPR before enabling
  45  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  46  * document number 292116).  So here it goes...
  47  */
  48 static void flat_init_apic_ldr(void)
  49 {
  50         unsigned long val;
  51         unsigned long num, id;
  52
  53         num = smp_processor_id();
  54         id = 1UL << num;
  55         x86_cpu_to_log_apicid[num] = id;
  56         apic_write(APIC_DFR, APIC_DFR_FLAT);
  57         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  58         val |= SET_APIC_LOGICAL_ID(id);
  59         apic_write(APIC_LDR, val);
  60 }
  61
  62 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
  63 {
  64         unsigned long mask = cpus_addr(cpumask)[0];
  65         unsigned long flags;
  66
  67         local_irq_save(flags);
  68         __send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
  69         local_irq_restore(flags);
  70 }
  71
  72 static void flat_send_IPI_allbutself(int vector)
  73 {
  74 #ifdef  CONFIG_HOTPLUG_CPU
  75         int hotplug = 1;
  76 #else
  77         int hotplug = 0;
  78 #endif
  79         if (hotplug || vector == NMI_VECTOR) {
  80                 cpumask_t allbutme = cpu_online_map;
  81
  82                 cpu_clear(smp_processor_id(), allbutme);
  83
  84                 if (!cpus_empty(allbutme))
  85                         flat_send_IPI_mask(allbutme, vector);
  86         } else if (num_online_cpus() > 1) {
  87                 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
  88         }
  89 }
  90
  91 static void flat_send_IPI_all(int vector)
  92 {
  93         if (vector == NMI_VECTOR)
  94                 flat_send_IPI_mask(cpu_online_map, vector);
  95         else
  96                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
  97 }
  98
  99 static int flat_apic_id_registered(void)
 100 {
 101         return physid_isset(GET_APIC_ID(apic_read(APIC_ID)), phys_cpu_present_map);
 102 }
 103
 104 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
 105 {
 106         return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
 107 }
 108
 109 static unsigned int phys_pkg_id(int index_msb)
 110 {
 111         return hard_smp_processor_id() >> index_msb;
 112 }
 113
 114 struct genapic apic_flat =  {
 115         .name = "flat",
 116         .int_delivery_mode = dest_LowestPrio,
 117         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
 118         .target_cpus = flat_target_cpus,
 119         .vector_allocation_domain = flat_vector_allocation_domain,
 120         .apic_id_registered = flat_apic_id_registered,
 121         .init_apic_ldr = flat_init_apic_ldr,
 122         .send_IPI_all = flat_send_IPI_all,
 123         .send_IPI_allbutself = flat_send_IPI_allbutself,
 124         .send_IPI_mask = flat_send_IPI_mask,
 125         .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
 126         .phys_pkg_id = phys_pkg_id,
 127 };
 128
 129 /*
 130  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
 131  * We cannot use logical delivery in this case because the mask
 132  * overflows, so use physical mode.
 133  */
 134
 135 static cpumask_t physflat_target_cpus(void)
 136 {
 137         return cpu_online_map;
 138 }
 139
 140 static cpumask_t physflat_vector_allocation_domain(int cpu)
 141 {
 142         cpumask_t domain = CPU_MASK_NONE;
 143         cpu_set(cpu, domain);
 144         return domain;
 145 }
 146
 147
 148 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
 149 {
 150         send_IPI_mask_sequence(cpumask, vector);
 151 }
 152
 153 static void physflat_send_IPI_allbutself(int vector)
 154 {
 155         cpumask_t allbutme = cpu_online_map;
 156
 157         cpu_clear(smp_processor_id(), allbutme);
 158         physflat_send_IPI_mask(allbutme, vector);
 159 }
 160
 161 static void physflat_send_IPI_all(int vector)
 162 {
 163         physflat_send_IPI_mask(cpu_online_map, vector);
 164 }
 165
 166 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
 167 {
 168         int cpu;
 169
 170         /*
 171          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 172          * May as well be the first.
 173          */
 174         cpu = first_cpu(cpumask);
 175         if ((unsigned)cpu < NR_CPUS)
 176                 return x86_cpu_to_apicid[cpu];
 177         else
 178                 return BAD_APICID;
 179 }
 180
 181 struct genapic apic_physflat =  {
 182         .name = "physical flat",
 183         .int_delivery_mode = dest_Fixed,
 184         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
 185         .target_cpus = physflat_target_cpus,
 186         .vector_allocation_domain = physflat_vector_allocation_domain,
 187         .apic_id_registered = flat_apic_id_registered,
 188         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
 189         .send_IPI_all = physflat_send_IPI_all,
 190         .send_IPI_allbutself = physflat_send_IPI_allbutself,
 191         .send_IPI_mask = physflat_send_IPI_mask,
 192         .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
 193         .phys_pkg_id = phys_pkg_id,
 194 };