arch/x86/kernel/apic/bigsmp_32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
   4  *
   5  * Drives the local APIC in "clustered mode".
   6  */
   7 #include <linux/cpumask.h>
   8 #include <linux/dmi.h>
   9 #include <linux/smp.h>
  10
  11 #include <asm/apic.h>
  12 #include <asm/io_apic.h>
  13
  14 #include "local.h"
  15
  16 static u32 bigsmp_get_apic_id(u32 x)
  17 {
  18         return (x >> 24) & 0xFF;
  19 }
  20
  21 static void bigsmp_send_IPI_allbutself(int vector)
  22 {
  23         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
  24 }
  25
  26 static void bigsmp_send_IPI_all(int vector)
  27 {
  28         default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
  29 }
  30
  31 static int dmi_bigsmp; /* can be set by dmi scanners */
  32
  33 static int hp_ht_bigsmp(const struct dmi_system_id *d)
  34 {
  35         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
  36         dmi_bigsmp = 1;
  37
  38         return 0;
  39 }
  40
  41
  42 static const struct dmi_system_id bigsmp_dmi_table[] = {
  43         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
  44                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
  45                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
  46                 }
  47         },
  48
  49         { hp_ht_bigsmp, "HP ProLiant DL740",
  50                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
  51                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
  52                 }
  53         },
  54         { } /* NULL entry stops DMI scanning */
  55 };
  56
  57 static int probe_bigsmp(void)
  58 {
  59         return dmi_check_system(bigsmp_dmi_table);
  60 }
  61
  62 static struct apic apic_bigsmp __ro_after_init = {
  63
  64         .name                           = "bigsmp",
  65         .probe                          = probe_bigsmp,
  66
  67         .dest_mode_logical              = false,
  68
  69         .disable_esr                    = 1,
  70
  71         .cpu_present_to_apicid          = default_cpu_present_to_apicid,
  72
  73         .max_apic_id                    = 0xFE,
  74         .get_apic_id                    = bigsmp_get_apic_id,
  75         .set_apic_id                    = NULL,
  76
  77         .calc_dest_apicid               = apic_default_calc_apicid,
  78
  79         .send_IPI                       = default_send_IPI_single_phys,
  80         .send_IPI_mask                  = default_send_IPI_mask_sequence_phys,
  81         .send_IPI_mask_allbutself       = NULL,
  82         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
  83         .send_IPI_all                   = bigsmp_send_IPI_all,
  84         .send_IPI_self                  = default_send_IPI_self,
  85
  86         .read                           = native_apic_mem_read,
  87         .write                          = native_apic_mem_write,
  88         .eoi                            = native_apic_mem_eoi,
  89         .icr_read                       = native_apic_icr_read,
  90         .icr_write                      = native_apic_icr_write,
  91         .wait_icr_idle                  = apic_mem_wait_icr_idle,
  92         .safe_wait_icr_idle             = apic_mem_wait_icr_idle_timeout,
  93 };
  94
  95 bool __init apic_bigsmp_possible(bool cmdline_override)
  96 {
  97         return apic == &apic_bigsmp || !cmdline_override;
  98 }
  99
 100 void __init apic_bigsmp_force(void)
 101 {
 102         if (apic != &apic_bigsmp)
 103                 apic_install_driver(&apic_bigsmp);
 104 }
 105
 106 apic_driver(apic_bigsmp);