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 const struct cpumask *bigsmp_target_cpus(void)
  30 {
  31 #ifdef CONFIG_SMP
  32         return cpu_online_mask;
  33 #else
  34         return cpumask_of(0);
  35 #endif
  36 }
  37
  38 static unsigned long bigsmp_check_apicid_used(physid_mask_t *map, int apicid)
  39 {
  40         return 0;
  41 }
  42
  43 static unsigned long bigsmp_check_apicid_present(int bit)
  44 {
  45         return 1;
  46 }
  47
  48 static int bigsmp_early_logical_apicid(int cpu)
  49 {
  50         /* on bigsmp, logical apicid is the same as physical */
  51         return early_per_cpu(x86_cpu_to_apicid, cpu);
  52 }
  53
  54 static inline unsigned long calculate_ldr(int cpu)
  55 {
  56         unsigned long val, id;
  57
  58         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  59         id = per_cpu(x86_bios_cpu_apicid, cpu);
  60         val |= SET_APIC_LOGICAL_ID(id);
  61
  62         return val;
  63 }
  64
  65 /*
  66  * Set up the logical destination ID.
  67  *
  68  * Intel recommends to set DFR, LDR and TPR before enabling
  69  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  70  * document number 292116).  So here it goes...
  71  */
  72 static void bigsmp_init_apic_ldr(void)
  73 {
  74         unsigned long val;
  75         int cpu = smp_processor_id();
  76
  77         apic_write(APIC_DFR, APIC_DFR_FLAT);
  78         val = calculate_ldr(cpu);
  79         apic_write(APIC_LDR, val);
  80 }
  81
  82 static void bigsmp_setup_apic_routing(void)
  83 {
  84         printk(KERN_INFO
  85                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  86                 nr_ioapics);
  87 }
  88
  89 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  90 {
  91         if (mps_cpu < nr_cpu_ids)
  92                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  93
  94         return BAD_APICID;
  95 }
  96
  97 static void bigsmp_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap)
  98 {
  99         /* For clustered we don't have a good way to do this yet - hack */
 100         physids_promote(0xFFL, retmap);
 101 }
 102
 103 static int bigsmp_check_phys_apicid_present(int phys_apicid)
 104 {
 105         return 1;
 106 }
 107
 108 /* As we are using single CPU as destination, pick only one CPU here */
 109 static unsigned int bigsmp_cpu_mask_to_apicid(const struct cpumask *cpumask)
 110 {
 111         int cpu = cpumask_first(cpumask);
 112
 113         if (cpu < nr_cpu_ids)
 114                 return cpu_physical_id(cpu);
 115         return BAD_APICID;
 116 }
 117
 118 static unsigned int bigsmp_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 119                               const struct cpumask *andmask)
 120 {
 121         int cpu;
 122
 123         /*
 124          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 125          * May as well be the first.
 126          */
 127         for_each_cpu_and(cpu, cpumask, andmask) {
 128                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 129                         return cpu_physical_id(cpu);
 130         }
 131         return BAD_APICID;
 132 }
 133
 134 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 135 {
 136         return cpuid_apic >> index_msb;
 137 }
 138
 139 static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector)
 140 {
 141         default_send_IPI_mask_sequence_phys(mask, vector);
 142 }
 143
 144 static void bigsmp_send_IPI_allbutself(int vector)
 145 {
 146         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 147 }
 148
 149 static void bigsmp_send_IPI_all(int vector)
 150 {
 151         bigsmp_send_IPI_mask(cpu_online_mask, vector);
 152 }
 153
 154 static int dmi_bigsmp; /* can be set by dmi scanners */
 155
 156 static int hp_ht_bigsmp(const struct dmi_system_id *d)
 157 {
 158         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
 159         dmi_bigsmp = 1;
 160
 161         return 0;
 162 }
 163
 164
 165 static const struct dmi_system_id bigsmp_dmi_table[] = {
 166         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
 167                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 168                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 169                 }
 170         },
 171
 172         { hp_ht_bigsmp, "HP ProLiant DL740",
 173                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 174                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 175                 }
 176         },
 177         { } /* NULL entry stops DMI scanning */
 178 };
 179
 180 static void bigsmp_vector_allocation_domain(int cpu, struct cpumask *retmask)
 181 {
 182         cpumask_clear(retmask);
 183         cpumask_set_cpu(cpu, retmask);
 184 }
 185
 186 static int probe_bigsmp(void)
 187 {
 188         if (def_to_bigsmp)
 189                 dmi_bigsmp = 1;
 190         else
 191                 dmi_check_system(bigsmp_dmi_table);
 192
 193         return dmi_bigsmp;
 194 }
 195
 196 static struct apic apic_bigsmp = {
 197
 198         .name                           = "bigsmp",
 199         .probe                          = probe_bigsmp,
 200         .acpi_madt_oem_check            = NULL,
 201         .apic_id_registered             = bigsmp_apic_id_registered,
 202
 203         .irq_delivery_mode              = dest_Fixed,
 204         /* phys delivery to target CPU: */
 205         .irq_dest_mode                  = 0,
 206
 207         .target_cpus                    = bigsmp_target_cpus,
 208         .disable_esr                    = 1,
 209         .dest_logical                   = 0,
 210         .check_apicid_used              = bigsmp_check_apicid_used,
 211         .check_apicid_present           = bigsmp_check_apicid_present,
 212
 213         .vector_allocation_domain       = bigsmp_vector_allocation_domain,
 214         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 215
 216         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 217         .setup_apic_routing             = bigsmp_setup_apic_routing,
 218         .multi_timer_check              = NULL,
 219         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 220         .apicid_to_cpu_present          = physid_set_mask_of_physid,
 221         .setup_portio_remap             = NULL,
 222         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 223         .enable_apic_mode               = NULL,
 224         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 225         .mps_oem_check                  = NULL,
 226
 227         .get_apic_id                    = bigsmp_get_apic_id,
 228         .set_apic_id                    = NULL,
 229         .apic_id_mask                   = 0xFF << 24,
 230
 231         .cpu_mask_to_apicid             = bigsmp_cpu_mask_to_apicid,
 232         .cpu_mask_to_apicid_and         = bigsmp_cpu_mask_to_apicid_and,
 233
 234         .send_IPI_mask                  = bigsmp_send_IPI_mask,
 235         .send_IPI_mask_allbutself       = NULL,
 236         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
 237         .send_IPI_all                   = bigsmp_send_IPI_all,
 238         .send_IPI_self                  = default_send_IPI_self,
 239
 240         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 241         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 242
 243         .wait_for_init_deassert         = default_wait_for_init_deassert,
 244
 245         .smp_callin_clear_local_apic    = NULL,
 246         .inquire_remote_apic            = default_inquire_remote_apic,
 247
 248         .read                           = native_apic_mem_read,
 249         .write                          = native_apic_mem_write,
 250         .icr_read                       = native_apic_icr_read,
 251         .icr_write                      = native_apic_icr_write,
 252         .wait_icr_idle                  = native_apic_wait_icr_idle,
 253         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 254
 255         .x86_32_early_logical_apicid    = bigsmp_early_logical_apicid,
 256 };
 257
 258 void __init generic_bigsmp_probe(void)
 259 {
 260         unsigned int cpu;
 261
 262         if (!probe_bigsmp())
 263                 return;
 264
 265         apic = &apic_bigsmp;
 266
 267         for_each_possible_cpu(cpu) {
 268                 if (early_per_cpu(x86_cpu_to_logical_apicid,
 269                                   cpu) == BAD_APICID)
 270                         continue;
 271                 early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
 272                         bigsmp_early_logical_apicid(cpu);
 273         }
 274
 275         pr_info("Overriding APIC driver with %s\n", apic_bigsmp.name);
 276 }
 277
 278 apic_driver(apic_bigsmp);