arch/x86/kernel/apic/bigsmp_32.c

   1 /*
   2  * APIC driver for "bigsmp" xAPIC machines with more than 8 virtual CPUs.
   3  *
   4  * Drives the local APIC in "clustered mode".
   5  */
   6 #include <linux/threads.h>
   7 #include <linux/cpumask.h>
   8 #include <linux/kernel.h>
   9 #include <linux/init.h>
  10 #include <linux/dmi.h>
  11 #include <linux/smp.h>
  12
  13 #include <asm/apicdef.h>
  14 #include <asm/fixmap.h>
  15 #include <asm/mpspec.h>
  16 #include <asm/apic.h>
  17 #include <asm/ipi.h>
  18
  19 static unsigned bigsmp_get_apic_id(unsigned long x)
  20 {
  21         return (x >> 24) & 0xFF;
  22 }
  23
  24 static int bigsmp_apic_id_registered(void)
  25 {
  26         return 1;
  27 }
  28
  29 static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
  30 {
  31         return 0;
  32 }
  33
  34 static unsigned long bigsmp_check_apicid_present(int bit)
  35 {
  36         return 1;
  37 }
  38
  39 static int bigsmp_early_logical_apicid(int cpu)
  40 {
  41         /* on bigsmp, logical apicid is the same as physical */
  42         return early_per_cpu(x86_cpu_to_apicid, cpu);
  43 }
  44
  45 static inline unsigned long calculate_ldr(int cpu)
  46 {
  47         unsigned long val, id;
  48
  49         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  50         id = per_cpu(x86_bios_cpu_apicid, cpu);
  51         val |= SET_APIC_LOGICAL_ID(id);
  52
  53         return val;
  54 }
  55
  56 /*
  57  * Set up the logical destination ID.
  58  *
  59  * Intel recommends to set DFR, LDR and TPR before enabling
  60  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  61  * document number 292116).  So here it goes...
  62  */
  63 static void bigsmp_init_apic_ldr(void)
  64 {
  65         unsigned long val;
  66         int cpu = smp_processor_id();
  67
  68         apic_write(APIC_DFR, APIC_DFR_FLAT);
  69         val = calculate_ldr(cpu);
  70         apic_write(APIC_LDR, val);
  71 }
  72
  73 static void bigsmp_setup_apic_routing(void)
  74 {
  75         printk(KERN_INFO
  76                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  77                 nr_ioapics);
  78 }
  79
  80 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  81 {
  82         if (mps_cpu < nr_cpu_ids)
  83                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  84
  85         return BAD_APICID;
  86 }
  87
  88 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
  89 {
  90         /* For clustered we don't have a good way to do this yet - hack */
  91         physids_promote(0xFFL, retmap);
  92 }
  93
  94 static int bigsmp_check_phys_apicid_present(int phys_apicid)
  95 {
  96         return 1;
  97 }
  98
  99 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 100 {
 101         return cpuid_apic >> index_msb;
 102 }
 103
 104 static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector)
 105 {
 106         default_send_IPI_mask_sequence_phys(mask, vector);
 107 }
 108
 109 static void bigsmp_send_IPI_allbutself(int vector)
 110 {
 111         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 112 }
 113
 114 static void bigsmp_send_IPI_all(int vector)
 115 {
 116         bigsmp_send_IPI_mask(cpu_online_mask, vector);
 117 }
 118
 119 static int dmi_bigsmp; /* can be set by dmi scanners */
 120
 121 static int hp_ht_bigsmp(const struct dmi_system_id *d)
 122 {
 123         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
 124         dmi_bigsmp = 1;
 125
 126         return 0;
 127 }
 128
 129
 130 static const struct dmi_system_id bigsmp_dmi_table[] = {
 131         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
 132                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 133                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 134                 }
 135         },
 136
 137         { hp_ht_bigsmp, "HP ProLiant DL740",
 138                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 139                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 140                 }
 141         },
 142         { } /* NULL entry stops DMI scanning */
 143 };
 144
 145 static int probe_bigsmp(void)
 146 {
 147         if (def_to_bigsmp)
 148                 dmi_bigsmp = 1;
 149         else
 150                 dmi_check_system(bigsmp_dmi_table);
 151
 152         return dmi_bigsmp;
 153 }
 154
 155 static struct apic apic_bigsmp = {
 156
 157         .name                           = "bigsmp",
 158         .probe                          = probe_bigsmp,
 159         .acpi_madt_oem_check            = NULL,
 160         .apic_id_valid                  = default_apic_id_valid,
 161         .apic_id_registered             = bigsmp_apic_id_registered,
 162
 163         .irq_delivery_mode              = dest_Fixed,
 164         /* phys delivery to target CPU: */
 165         .irq_dest_mode                  = 0,
 166
 167         .target_cpus                    = default_target_cpus,
 168         .disable_esr                    = 1,
 169         .dest_logical                   = 0,
 170         .check_apicid_used              = bigsmp_check_apicid_used,
 171         .check_apicid_present           = bigsmp_check_apicid_present,
 172
 173         .vector_allocation_domain       = default_vector_allocation_domain,
 174         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 175
 176         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 177         .setup_apic_routing             = bigsmp_setup_apic_routing,
 178         .multi_timer_check              = NULL,
 179         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 180         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 181         .setup_portio_remap             = NULL,
 182         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 183         .enable_apic_mode               = NULL,
 184         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 185         .mps_oem_check                  = NULL,
 186
 187         .get_apic_id                    = bigsmp_get_apic_id,
 188         .set_apic_id                    = NULL,
 189         .apic_id_mask                   = 0xFF << 24,
 190
 191         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 192
 193         .send_IPI_mask                  = bigsmp_send_IPI_mask,
 194         .send_IPI_mask_allbutself       = NULL,
 195         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
 196         .send_IPI_all                   = bigsmp_send_IPI_all,
 197         .send_IPI_self                  = default_send_IPI_self,
 198
 199         .wait_for_init_deassert         = true,
 200         .smp_callin_clear_local_apic    = NULL,
 201         .inquire_remote_apic            = default_inquire_remote_apic,
 202
 203         .read                           = native_apic_mem_read,
 204         .write                          = native_apic_mem_write,
 205         .eoi_write                      = native_apic_mem_write,
 206         .icr_read                       = native_apic_icr_read,
 207         .icr_write                      = native_apic_icr_write,
 208         .wait_icr_idle                  = native_apic_wait_icr_idle,
 209         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 210
 211         .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 212 };
 213
 214 void __init generic_bigsmp_probe(void)
 215 {
 216         unsigned int cpu;
 217
 218         if (!probe_bigsmp())
 219                 return;
 220
 221         apic = &apic_bigsmp;
 222
 223         for_each_possible_cpu(cpu) {
 224                 if (early_per_cpu(x86_cpu_to_logical_apicid,
 225                                   cpu) == BAD_APICID)
 226                         continue;
 227                 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
 228                         bigsmp_early_logical_apicid(cpu);
 229         }
 230
 231         pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 232 }
 233
 234 apic_driver(apic_bigsmp);