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 unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
  31 {
  32         return 0;
  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 static inline unsigned long calculate_ldr(int cpu)
  42 {
  43         unsigned long val, id;
  44
  45         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  46         id = per_cpu(x86_bios_cpu_apicid, cpu);
  47         val |= SET_APIC_LOGICAL_ID(id);
  48
  49         return val;
  50 }
  51
  52 /*
  53  * Set up the logical destination ID.
  54  *
  55  * Intel recommends to set DFR, LDR and TPR before enabling
  56  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  57  * document number 292116).  So here it goes...
  58  */
  59 static void bigsmp_init_apic_ldr(void)
  60 {
  61         unsigned long val;
  62         int cpu = smp_processor_id();
  63
  64         apic_write(APIC_DFR, APIC_DFR_FLAT);
  65         val = calculate_ldr(cpu);
  66         apic_write(APIC_LDR, val);
  67 }
  68
  69 static void bigsmp_setup_apic_routing(void)
  70 {
  71         printk(KERN_INFO
  72                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  73                 nr_ioapics);
  74 }
  75
  76 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  77 {
  78         if (mps_cpu < nr_cpu_ids)
  79                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  80
  81         return BAD_APICID;
  82 }
  83
  84 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
  85 {
  86         /* For clustered we don't have a good way to do this yet - hack */
  87         physids_promote(0xFFL, retmap);
  88 }
  89
  90 static int bigsmp_check_phys_apicid_present(int phys_apicid)
  91 {
  92         return 1;
  93 }
  94
  95 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
  96 {
  97         return cpuid_apic >> index_msb;
  98 }
  99
 100 static void bigsmp_send_IPI_allbutself(int vector)
 101 {
 102         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 103 }
 104
 105 static void bigsmp_send_IPI_all(int vector)
 106 {
 107         default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
 108 }
 109
 110 static int dmi_bigsmp; /* can be set by dmi scanners */
 111
 112 static int hp_ht_bigsmp(const struct dmi_system_id *d)
 113 {
 114         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
 115         dmi_bigsmp = 1;
 116
 117         return 0;
 118 }
 119
 120
 121 static const struct dmi_system_id bigsmp_dmi_table[] = {
 122         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
 123                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 124                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 125                 }
 126         },
 127
 128         { hp_ht_bigsmp, "HP ProLiant DL740",
 129                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 130                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 131                 }
 132         },
 133         { } /* NULL entry stops DMI scanning */
 134 };
 135
 136 static int probe_bigsmp(void)
 137 {
 138         if (def_to_bigsmp)
 139                 dmi_bigsmp = 1;
 140         else
 141                 dmi_check_system(bigsmp_dmi_table);
 142
 143         return dmi_bigsmp;
 144 }
 145
 146 static struct apic apic_bigsmp __ro_after_init = {
 147
 148         .name                           = "bigsmp",
 149         .probe                          = probe_bigsmp,
 150         .acpi_madt_oem_check            = NULL,
 151         .apic_id_valid                  = default_apic_id_valid,
 152         .apic_id_registered             = bigsmp_apic_id_registered,
 153
 154         .irq_delivery_mode              = dest_Fixed,
 155         /* phys delivery to target CPU: */
 156         .irq_dest_mode                  = 0,
 157
 158         .target_cpus                    = default_target_cpus,
 159         .disable_esr                    = 1,
 160         .dest_logical                   = 0,
 161         .check_apicid_used              = bigsmp_check_apicid_used,
 162
 163         .vector_allocation_domain       = default_vector_allocation_domain,
 164         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 165
 166         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 167         .setup_apic_routing             = bigsmp_setup_apic_routing,
 168         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 169         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 170         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 171         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 172
 173         .get_apic_id                    = bigsmp_get_apic_id,
 174         .set_apic_id                    = NULL,
 175
 176         .cpu_mask_to_apicid             = default_cpu_mask_to_apicid,
 177
 178         .send_IPI                       = default_send_IPI_single_phys,
 179         .send_IPI_mask                  = default_send_IPI_mask_sequence_phys,
 180         .send_IPI_mask_allbutself       = NULL,
 181         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
 182         .send_IPI_all                   = bigsmp_send_IPI_all,
 183         .send_IPI_self                  = default_send_IPI_self,
 184
 185         .inquire_remote_apic            = default_inquire_remote_apic,
 186
 187         .read                           = native_apic_mem_read,
 188         .write                          = native_apic_mem_write,
 189         .eoi_write                      = native_apic_mem_write,
 190         .icr_read                       = native_apic_icr_read,
 191         .icr_write                      = native_apic_icr_write,
 192         .wait_icr_idle                  = native_apic_wait_icr_idle,
 193         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 194
 195         .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 196 };
 197
 198 void __init generic_bigsmp_probe(void)
 199 {
 200         unsigned int cpu;
 201
 202         if (!probe_bigsmp())
 203                 return;
 204
 205         apic = &apic_bigsmp;
 206
 207         for_each_possible_cpu(cpu) {
 208                 if (early_per_cpu(x86_cpu_to_logical_apicid,
 209                                   cpu) == BAD_APICID)
 210                         continue;
 211                 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
 212                         bigsmp_early_logical_apicid(cpu);
 213         }
 214
 215         pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 216 }
 217
 218 apic_driver(apic_bigsmp);