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 unsigned bigsmp_get_apic_id(unsigned long x)
  17 {
  18         return (x >> 24) & 0xFF;
  19 }
  20
  21 static int bigsmp_apic_id_registered(void)
  22 {
  23         return 1;
  24 }
  25
  26 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
  27 {
  28         return false;
  29 }
  30
  31 static int bigsmp_early_logical_apicid(int cpu)
  32 {
  33         /* on bigsmp, logical apicid is the same as physical */
  34         return early_per_cpu(x86_cpu_to_apicid, cpu);
  35 }
  36
  37 /*
  38  * bigsmp enables physical destination mode
  39  * and doesn't use LDR and DFR
  40  */
  41 static void bigsmp_init_apic_ldr(void)
  42 {
  43 }
  44
  45 static void bigsmp_setup_apic_routing(void)
  46 {
  47         printk(KERN_INFO
  48                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  49                 nr_ioapics);
  50 }
  51
  52 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  53 {
  54         if (mps_cpu < nr_cpu_ids)
  55                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  56
  57         return BAD_APICID;
  58 }
  59
  60 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
  61 {
  62         /* For clustered we don't have a good way to do this yet - hack */
  63         physids_promote(0xFFL, retmap);
  64 }
  65
  66 static int bigsmp_check_phys_apicid_present(int phys_apicid)
  67 {
  68         return 1;
  69 }
  70
  71 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
  72 {
  73         return cpuid_apic >> index_msb;
  74 }
  75
  76 static void bigsmp_send_IPI_allbutself(int vector)
  77 {
  78         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
  79 }
  80
  81 static void bigsmp_send_IPI_all(int vector)
  82 {
  83         default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
  84 }
  85
  86 static int dmi_bigsmp; /* can be set by dmi scanners */
  87
  88 static int hp_ht_bigsmp(const struct dmi_system_id *d)
  89 {
  90         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
  91         dmi_bigsmp = 1;
  92
  93         return 0;
  94 }
  95
  96
  97 static const struct dmi_system_id bigsmp_dmi_table[] = {
  98         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
  99                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 100                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 101                 }
 102         },
 103
 104         { hp_ht_bigsmp, "HP ProLiant DL740",
 105                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 106                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 107                 }
 108         },
 109         { } /* NULL entry stops DMI scanning */
 110 };
 111
 112 static int probe_bigsmp(void)
 113 {
 114         if (def_to_bigsmp)
 115                 dmi_bigsmp = 1;
 116         else
 117                 dmi_check_system(bigsmp_dmi_table);
 118
 119         return dmi_bigsmp;
 120 }
 121
 122 static struct apic apic_bigsmp __ro_after_init = {
 123
 124         .name                           = "bigsmp",
 125         .probe                          = probe_bigsmp,
 126         .acpi_madt_oem_check            = NULL,
 127         .apic_id_valid                  = default_apic_id_valid,
 128         .apic_id_registered             = bigsmp_apic_id_registered,
 129
 130         .delivery_mode                  = APIC_DELIVERY_MODE_FIXED,
 131         .dest_mode_logical              = false,
 132
 133         .disable_esr                    = 1,
 134
 135         .check_apicid_used              = bigsmp_check_apicid_used,
 136         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 137         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 138         .setup_apic_routing             = bigsmp_setup_apic_routing,
 139         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 140         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 141         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 142         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 143
 144         .get_apic_id                    = bigsmp_get_apic_id,
 145         .set_apic_id                    = NULL,
 146
 147         .calc_dest_apicid               = apic_default_calc_apicid,
 148
 149         .send_IPI                       = default_send_IPI_single_phys,
 150         .send_IPI_mask                  = default_send_IPI_mask_sequence_phys,
 151         .send_IPI_mask_allbutself       = NULL,
 152         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
 153         .send_IPI_all                   = bigsmp_send_IPI_all,
 154         .send_IPI_self                  = default_send_IPI_self,
 155
 156         .inquire_remote_apic            = default_inquire_remote_apic,
 157
 158         .read                           = native_apic_mem_read,
 159         .write                          = native_apic_mem_write,
 160         .eoi_write                      = native_apic_mem_write,
 161         .icr_read                       = native_apic_icr_read,
 162         .icr_write                      = native_apic_icr_write,
 163         .wait_icr_idle                  = native_apic_wait_icr_idle,
 164         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 165
 166         .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 167 };
 168
 169 void __init generic_bigsmp_probe(void)
 170 {
 171         unsigned int cpu;
 172
 173         if (!probe_bigsmp())
 174                 return;
 175
 176         apic = &apic_bigsmp;
 177
 178         for_each_possible_cpu(cpu) {
 179                 if (early_per_cpu(x86_cpu_to_logical_apicid,
 180                                   cpu) == BAD_APICID)
 181                         continue;
 182                 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
 183                         bigsmp_early_logical_apicid(cpu);
 184         }
 185
 186         pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 187 }
 188
 189 apic_driver(apic_bigsmp);