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 int bigsmp_early_logical_apicid(int cpu)
  35 {
  36         /* on bigsmp, logical apicid is the same as physical */
  37         return early_per_cpu(x86_cpu_to_apicid, cpu);
  38 }
  39
  40 static inline unsigned long calculate_ldr(int cpu)
  41 {
  42         unsigned long val, id;
  43
  44         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  45         id = per_cpu(x86_bios_cpu_apicid, cpu);
  46         val |= SET_APIC_LOGICAL_ID(id);
  47
  48         return val;
  49 }
  50
  51 /*
  52  * Set up the logical destination ID.
  53  *
  54  * Intel recommends to set DFR, LDR and TPR before enabling
  55  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  56  * document number 292116).  So here it goes...
  57  */
  58 static void bigsmp_init_apic_ldr(void)
  59 {
  60         unsigned long val;
  61         int cpu = smp_processor_id();
  62
  63         apic_write(APIC_DFR, APIC_DFR_FLAT);
  64         val = calculate_ldr(cpu);
  65         apic_write(APIC_LDR, val);
  66 }
  67
  68 static void bigsmp_setup_apic_routing(void)
  69 {
  70         printk(KERN_INFO
  71                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  72                 nr_ioapics);
  73 }
  74
  75 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  76 {
  77         if (mps_cpu < nr_cpu_ids)
  78                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  79
  80         return BAD_APICID;
  81 }
  82
  83 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
  84 {
  85         /* For clustered we don't have a good way to do this yet - hack */
  86         physids_promote(0xFFL, retmap);
  87 }
  88
  89 static int bigsmp_check_phys_apicid_present(int phys_apicid)
  90 {
  91         return 1;
  92 }
  93
  94 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
  95 {
  96         return cpuid_apic >> index_msb;
  97 }
  98
  99 static void bigsmp_send_IPI_allbutself(int vector)
 100 {
 101         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 102 }
 103
 104 static void bigsmp_send_IPI_all(int vector)
 105 {
 106         default_send_IPI_mask_sequence_phys(cpu_online_mask, vector);
 107 }
 108
 109 static int dmi_bigsmp; /* can be set by dmi scanners */
 110
 111 static int hp_ht_bigsmp(const struct dmi_system_id *d)
 112 {
 113         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
 114         dmi_bigsmp = 1;
 115
 116         return 0;
 117 }
 118
 119
 120 static const struct dmi_system_id bigsmp_dmi_table[] = {
 121         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
 122                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 123                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 124                 }
 125         },
 126
 127         { hp_ht_bigsmp, "HP ProLiant DL740",
 128                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 129                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 130                 }
 131         },
 132         { } /* NULL entry stops DMI scanning */
 133 };
 134
 135 static int probe_bigsmp(void)
 136 {
 137         if (def_to_bigsmp)
 138                 dmi_bigsmp = 1;
 139         else
 140                 dmi_check_system(bigsmp_dmi_table);
 141
 142         return dmi_bigsmp;
 143 }
 144
 145 static struct apic apic_bigsmp = {
 146
 147         .name                           = "bigsmp",
 148         .probe                          = probe_bigsmp,
 149         .acpi_madt_oem_check            = NULL,
 150         .apic_id_valid                  = default_apic_id_valid,
 151         .apic_id_registered             = bigsmp_apic_id_registered,
 152
 153         .irq_delivery_mode              = dest_Fixed,
 154         /* phys delivery to target CPU: */
 155         .irq_dest_mode                  = 0,
 156
 157         .target_cpus                    = default_target_cpus,
 158         .disable_esr                    = 1,
 159         .dest_logical                   = 0,
 160         .check_apicid_used              = bigsmp_check_apicid_used,
 161
 162         .vector_allocation_domain       = default_vector_allocation_domain,
 163         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 164
 165         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 166         .setup_apic_routing             = bigsmp_setup_apic_routing,
 167         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 168         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 169         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 170         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 171
 172         .get_apic_id                    = bigsmp_get_apic_id,
 173         .set_apic_id                    = NULL,
 174         .apic_id_mask                   = 0xFF << 24,
 175
 176         .cpu_mask_to_apicid_and         = default_cpu_mask_to_apicid_and,
 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);