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         apic_write(APIC_DFR, APIC_DFR_FLAT);
  56         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  57         val |= SET_APIC_LOGICAL_ID(id);
  58         apic_write(APIC_LDR, val);
  59 }
  60
  61 static void flat_send_IPI_mask(cpumask_t cpumask, int vector)
  62 {
  63         unsigned long mask = cpus_addr(cpumask)[0];
  64         unsigned long flags;
  65
  66         local_irq_save(flags);
  67         __send_IPI_dest_field(mask, vector, APIC_DEST_LOGICAL);
  68         local_irq_restore(flags);
  69 }
  70
  71 static void flat_send_IPI_allbutself(int vector)
  72 {
  73 #ifdef  CONFIG_HOTPLUG_CPU
  74         int hotplug = 1;
  75 #else
  76         int hotplug = 0;
  77 #endif
  78         if (hotplug || vector == NMI_VECTOR) {
  79                 cpumask_t allbutme = cpu_online_map;
  80
  81                 cpu_clear(smp_processor_id(), allbutme);
  82
  83                 if (!cpus_empty(allbutme))
  84                         flat_send_IPI_mask(allbutme, vector);
  85         } else if (num_online_cpus() > 1) {
  86                 __send_IPI_shortcut(APIC_DEST_ALLBUT, vector,APIC_DEST_LOGICAL);
  87         }
  88 }
  89
  90 static void flat_send_IPI_all(int vector)
  91 {
  92         if (vector == NMI_VECTOR)
  93                 flat_send_IPI_mask(cpu_online_map, vector);
  94         else
  95                 __send_IPI_shortcut(APIC_DEST_ALLINC, vector, APIC_DEST_LOGICAL);
  96 }
  97
  98 static int flat_apic_id_registered(void)
  99 {
 100         return physid_isset(GET_APIC_ID(read_apic_id()), phys_cpu_present_map);
 101 }
 102
 103 static unsigned int flat_cpu_mask_to_apicid(cpumask_t cpumask)
 104 {
 105         return cpus_addr(cpumask)[0] & APIC_ALL_CPUS;
 106 }
 107
 108 static unsigned int phys_pkg_id(int index_msb)
 109 {
 110         return hard_smp_processor_id() >> index_msb;
 111 }
 112
 113 struct genapic apic_flat =  {
 114         .name = "flat",
 115         .int_delivery_mode = dest_LowestPrio,
 116         .int_dest_mode = (APIC_DEST_LOGICAL != 0),
 117         .target_cpus = flat_target_cpus,
 118         .vector_allocation_domain = flat_vector_allocation_domain,
 119         .apic_id_registered = flat_apic_id_registered,
 120         .init_apic_ldr = flat_init_apic_ldr,
 121         .send_IPI_all = flat_send_IPI_all,
 122         .send_IPI_allbutself = flat_send_IPI_allbutself,
 123         .send_IPI_mask = flat_send_IPI_mask,
 124         .cpu_mask_to_apicid = flat_cpu_mask_to_apicid,
 125         .phys_pkg_id = phys_pkg_id,
 126 };
 127
 128 /*
 129  * Physflat mode is used when there are more than 8 CPUs on a AMD system.
 130  * We cannot use logical delivery in this case because the mask
 131  * overflows, so use physical mode.
 132  */
 133
 134 static cpumask_t physflat_target_cpus(void)
 135 {
 136         return cpu_online_map;
 137 }
 138
 139 static cpumask_t physflat_vector_allocation_domain(int cpu)
 140 {
 141         return cpumask_of_cpu(cpu);
 142 }
 143
 144 static void physflat_send_IPI_mask(cpumask_t cpumask, int vector)
 145 {
 146         send_IPI_mask_sequence(cpumask, vector);
 147 }
 148
 149 static void physflat_send_IPI_allbutself(int vector)
 150 {
 151         cpumask_t allbutme = cpu_online_map;
 152
 153         cpu_clear(smp_processor_id(), allbutme);
 154         physflat_send_IPI_mask(allbutme, vector);
 155 }
 156
 157 static void physflat_send_IPI_all(int vector)
 158 {
 159         physflat_send_IPI_mask(cpu_online_map, vector);
 160 }
 161
 162 static unsigned int physflat_cpu_mask_to_apicid(cpumask_t cpumask)
 163 {
 164         int cpu;
 165
 166         /*
 167          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 168          * May as well be the first.
 169          */
 170         cpu = first_cpu(cpumask);
 171         if ((unsigned)cpu < NR_CPUS)
 172                 return per_cpu(x86_cpu_to_apicid, cpu);
 173         else
 174                 return BAD_APICID;
 175 }
 176
 177 struct genapic apic_physflat =  {
 178         .name = "physical flat",
 179         .int_delivery_mode = dest_Fixed,
 180         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
 181         .target_cpus = physflat_target_cpus,
 182         .vector_allocation_domain = physflat_vector_allocation_domain,
 183         .apic_id_registered = flat_apic_id_registered,
 184         .init_apic_ldr = flat_init_apic_ldr,/*not needed, but shouldn't hurt*/
 185         .send_IPI_all = physflat_send_IPI_all,
 186         .send_IPI_allbutself = physflat_send_IPI_allbutself,
 187         .send_IPI_mask = physflat_send_IPI_mask,
 188         .cpu_mask_to_apicid = physflat_cpu_mask_to_apicid,
 189         .phys_pkg_id = phys_pkg_id,
 190 };