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/threads.h>
   8 #include <linux/cpumask.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/dmi.h>
  12 #include <linux/smp.h>
  13
  14 #include <asm/apicdef.h>
  15 #include <asm/fixmap.h>
  16 #include <asm/mpspec.h>
  17 #include <asm/apic.h>
  18 #include <asm/ipi.h>
  19
  20 static unsigned bigsmp_get_apic_id(unsigned long x)
  21 {
  22         return (x >> 24) & 0xFF;
  23 }
  24
  25 static int bigsmp_apic_id_registered(void)
  26 {
  27         return 1;
  28 }
  29
  30 static bool bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
  31 {
  32         return false;
  33 }
  34
  35 static int bigsmp_early_logical_apicid(int cpu)
  36 {
  37         /* on bigsmp, logical apicid is the same as physical */
  38         return early_per_cpu(x86_cpu_to_apicid, cpu);
  39 }
  40
  41 /*
  42  * bigsmp enables physical destination mode
  43  * and doesn't use LDR and DFR
  44  */
  45 static void bigsmp_init_apic_ldr(void)
  46 {
  47 }
  48
  49 static void bigsmp_setup_apic_routing(void)
  50 {
  51         printk(KERN_INFO
  52                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  53                 nr_ioapics);
  54 }
  55
  56 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  57 {
  58         if (mps_cpu < nr_cpu_ids)
  59                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  60
  61         return BAD_APICID;
  62 }
  63
  64 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
  65 {
  66         /* For clustered we don't have a good way to do this yet - hack */
  67         physids_promote(0xFFL, retmap);
  68 }
  69
  70 static int bigsmp_check_phys_apicid_present(int phys_apicid)
  71 {
  72         return 1;
  73 }
  74
  75 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
  76 {
  77         return cpuid_apic >> index_msb;
  78 }
  79
  80 static void bigsmp_send_IPI_allbutself(int vector)
  81 {
  82         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
  83 }
  84
  85 static void bigsmp_send_IPI_all(int vector)
  86 {
  87         default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
  88 }
  89
  90 static int dmi_bigsmp; /* can be set by dmi scanners */
  91
  92 static int hp_ht_bigsmp(const struct dmi_system_id *d)
  93 {
  94         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
  95         dmi_bigsmp = 1;
  96
  97         return 0;
  98 }
  99
 100
 101 static const struct dmi_system_id bigsmp_dmi_table[] = {
 102         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
 103                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 104                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 105                 }
 106         },
 107
 108         { hp_ht_bigsmp, "HP ProLiant DL740",
 109                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 110                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 111                 }
 112         },
 113         { } /* NULL entry stops DMI scanning */
 114 };
 115
 116 static int probe_bigsmp(void)
 117 {
 118         if (def_to_bigsmp)
 119                 dmi_bigsmp = 1;
 120         else
 121                 dmi_check_system(bigsmp_dmi_table);
 122
 123         return dmi_bigsmp;
 124 }
 125
 126 static struct apic apic_bigsmp __ro_after_init = {
 127
 128         .name                           = "bigsmp",
 129         .probe                          = probe_bigsmp,
 130         .acpi_madt_oem_check            = NULL,
 131         .apic_id_valid                  = default_apic_id_valid,
 132         .apic_id_registered             = bigsmp_apic_id_registered,
 133
 134         .irq_delivery_mode              = dest_Fixed,
 135         /* phys delivery to target CPU: */
 136         .irq_dest_mode                  = 0,
 137
 138         .disable_esr                    = 1,
 139         .dest_logical                   = 0,
 140         .check_apicid_used              = bigsmp_check_apicid_used,
 141
 142         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 143
 144         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 145         .setup_apic_routing             = bigsmp_setup_apic_routing,
 146         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 147         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 148         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 149         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 150
 151         .get_apic_id                    = bigsmp_get_apic_id,
 152         .set_apic_id                    = NULL,
 153
 154         .calc_dest_apicid               = apic_default_calc_apicid,
 155
 156         .send_IPI                       = default_send_IPI_single_phys,
 157         .send_IPI_mask                  = default_send_IPI_mask_sequence_phys,
 158         .send_IPI_mask_allbutself       = NULL,
 159         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
 160         .send_IPI_all                   = bigsmp_send_IPI_all,
 161         .send_IPI_self                  = default_send_IPI_self,
 162
 163         .inquire_remote_apic            = default_inquire_remote_apic,
 164
 165         .read                           = native_apic_mem_read,
 166         .write                          = native_apic_mem_write,
 167         .eoi_write                      = native_apic_mem_write,
 168         .icr_read                       = native_apic_icr_read,
 169         .icr_write                      = native_apic_icr_write,
 170         .wait_icr_idle                  = native_apic_wait_icr_idle,
 171         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 172
 173         .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 174 };
 175
 176 void __init generic_bigsmp_probe(void)
 177 {
 178         unsigned int cpu;
 179
 180         if (!probe_bigsmp())
 181                 return;
 182
 183         apic = &apic_bigsmp;
 184
 185         for_each_possible_cpu(cpu) {
 186                 if (early_per_cpu(x86_cpu_to_logical_apicid,
 187                                   cpu) == BAD_APICID)
 188                         continue;
 189                 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
 190                         bigsmp_early_logical_apicid(cpu);
 191         }
 192
 193         pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 194 }
 195
 196 apic_driver(apic_bigsmp);