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 bitmap, 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 inline unsigned long calculate_ldr(int cpu)
  49 {
  50         unsigned long val, id;
  51
  52         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
  53         id = per_cpu(x86_bios_cpu_apicid, cpu);
  54         val |= SET_APIC_LOGICAL_ID(id);
  55
  56         return val;
  57 }
  58
  59 /*
  60  * Set up the logical destination ID.
  61  *
  62  * Intel recommends to set DFR, LDR and TPR before enabling
  63  * an APIC.  See e.g. "AP-388 82489DX User's Manual" (Intel
  64  * document number 292116).  So here it goes...
  65  */
  66 static void bigsmp_init_apic_ldr(void)
  67 {
  68         unsigned long val;
  69         int cpu = smp_processor_id();
  70
  71         apic_write(APIC_DFR, APIC_DFR_FLAT);
  72         val = calculate_ldr(cpu);
  73         apic_write(APIC_LDR, val);
  74 }
  75
  76 static void bigsmp_setup_apic_routing(void)
  77 {
  78         printk(KERN_INFO
  79                 "Enabling APIC mode:  Physflat.  Using %d I/O APICs\n",
  80                 nr_ioapics);
  81 }
  82
  83 static int bigsmp_apicid_to_node(int logical_apicid)
  84 {
  85         return apicid_2_node[hard_smp_processor_id()];
  86 }
  87
  88 static int bigsmp_cpu_present_to_apicid(int mps_cpu)
  89 {
  90         if (mps_cpu < nr_cpu_ids)
  91                 return (int) per_cpu(x86_bios_cpu_apicid, mps_cpu);
  92
  93         return BAD_APICID;
  94 }
  95
  96 static physid_mask_t bigsmp_apicid_to_cpu_present(int phys_apicid)
  97 {
  98         return physid_mask_of_physid(phys_apicid);
  99 }
 100
 101 /* Mapping from cpu number to logical apicid */
 102 static inline int bigsmp_cpu_to_logical_apicid(int cpu)
 103 {
 104         if (cpu >= nr_cpu_ids)
 105                 return BAD_APICID;
 106         return cpu_physical_id(cpu);
 107 }
 108
 109 static physid_mask_t bigsmp_ioapic_phys_id_map(physid_mask_t phys_map)
 110 {
 111         /* For clustered we don't have a good way to do this yet - hack */
 112         return physids_promote(0xFFL);
 113 }
 114
 115 static int bigsmp_check_phys_apicid_present(int boot_cpu_physical_apicid)
 116 {
 117         return 1;
 118 }
 119
 120 /* As we are using single CPU as destination, pick only one CPU here */
 121 static unsigned int bigsmp_cpu_mask_to_apicid(const struct cpumask *cpumask)
 122 {
 123         return bigsmp_cpu_to_logical_apicid(cpumask_first(cpumask));
 124 }
 125
 126 static unsigned int bigsmp_cpu_mask_to_apicid_and(const struct cpumask *cpumask,
 127                               const struct cpumask *andmask)
 128 {
 129         int cpu;
 130
 131         /*
 132          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 133          * May as well be the first.
 134          */
 135         for_each_cpu_and(cpu, cpumask, andmask) {
 136                 if (cpumask_test_cpu(cpu, cpu_online_mask))
 137                         break;
 138         }
 139         if (cpu < nr_cpu_ids)
 140                 return bigsmp_cpu_to_logical_apicid(cpu);
 141
 142         return BAD_APICID;
 143 }
 144
 145 static int bigsmp_phys_pkg_id(int cpuid_apic, int index_msb)
 146 {
 147         return cpuid_apic >> index_msb;
 148 }
 149
 150 static inline void bigsmp_send_IPI_mask(const struct cpumask *mask, int vector)
 151 {
 152         default_send_IPI_mask_sequence_phys(mask, vector);
 153 }
 154
 155 static void bigsmp_send_IPI_allbutself(int vector)
 156 {
 157         default_send_IPI_mask_allbutself_phys(cpu_online_mask, vector);
 158 }
 159
 160 static void bigsmp_send_IPI_all(int vector)
 161 {
 162         bigsmp_send_IPI_mask(cpu_online_mask, vector);
 163 }
 164
 165 static int dmi_bigsmp; /* can be set by dmi scanners */
 166
 167 static int hp_ht_bigsmp(const struct dmi_system_id *d)
 168 {
 169         printk(KERN_NOTICE "%s detected: force use of apic=bigsmp\n", d->ident);
 170         dmi_bigsmp = 1;
 171
 172         return 0;
 173 }
 174
 175
 176 static const struct dmi_system_id bigsmp_dmi_table[] = {
 177         { hp_ht_bigsmp, "HP ProLiant DL760 G2",
 178                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 179                         DMI_MATCH(DMI_BIOS_VERSION, "P44-"),
 180                 }
 181         },
 182
 183         { hp_ht_bigsmp, "HP ProLiant DL740",
 184                 {       DMI_MATCH(DMI_BIOS_VENDOR, "HP"),
 185                         DMI_MATCH(DMI_BIOS_VERSION, "P47-"),
 186                 }
 187         },
 188         { } /* NULL entry stops DMI scanning */
 189 };
 190
 191 static void bigsmp_vector_allocation_domain(int cpu, struct cpumask *retmask)
 192 {
 193         cpumask_clear(retmask);
 194         cpumask_set_cpu(cpu, retmask);
 195 }
 196
 197 static int probe_bigsmp(void)
 198 {
 199         if (def_to_bigsmp)
 200                 dmi_bigsmp = 1;
 201         else
 202                 dmi_check_system(bigsmp_dmi_table);
 203
 204         return dmi_bigsmp;
 205 }
 206
 207 struct apic apic_bigsmp = {
 208
 209         .name                           = "bigsmp",
 210         .probe                          = probe_bigsmp,
 211         .acpi_madt_oem_check            = NULL,
 212         .apic_id_registered             = bigsmp_apic_id_registered,
 213
 214         .irq_delivery_mode              = dest_Fixed,
 215         /* phys delivery to target CPU: */
 216         .irq_dest_mode                  = 0,
 217
 218         .target_cpus                    = bigsmp_target_cpus,
 219         .disable_esr                    = 1,
 220         .dest_logical                   = 0,
 221         .check_apicid_used              = bigsmp_check_apicid_used,
 222         .check_apicid_present           = bigsmp_check_apicid_present,
 223
 224         .vector_allocation_domain       = bigsmp_vector_allocation_domain,
 225         .init_apic_ldr                  = bigsmp_init_apic_ldr,
 226
 227         .ioapic_phys_id_map             = bigsmp_ioapic_phys_id_map,
 228         .setup_apic_routing             = bigsmp_setup_apic_routing,
 229         .multi_timer_check              = NULL,
 230         .apicid_to_node                 = bigsmp_apicid_to_node,
 231         .cpu_to_logical_apicid          = bigsmp_cpu_to_logical_apicid,
 232         .cpu_present_to_apicid          = bigsmp_cpu_present_to_apicid,
 233         .apicid_to_cpu_present          = bigsmp_apicid_to_cpu_present,
 234         .setup_portio_remap             = NULL,
 235         .check_phys_apicid_present      = bigsmp_check_phys_apicid_present,
 236         .enable_apic_mode               = NULL,
 237         .phys_pkg_id                    = bigsmp_phys_pkg_id,
 238         .mps_oem_check                  = NULL,
 239
 240         .get_apic_id                    = bigsmp_get_apic_id,
 241         .set_apic_id                    = NULL,
 242         .apic_id_mask                   = 0xFF << 24,
 243
 244         .cpu_mask_to_apicid             = bigsmp_cpu_mask_to_apicid,
 245         .cpu_mask_to_apicid_and         = bigsmp_cpu_mask_to_apicid_and,
 246
 247         .send_IPI_mask                  = bigsmp_send_IPI_mask,
 248         .send_IPI_mask_allbutself       = NULL,
 249         .send_IPI_allbutself            = bigsmp_send_IPI_allbutself,
 250         .send_IPI_all                   = bigsmp_send_IPI_all,
 251         .send_IPI_self                  = default_send_IPI_self,
 252
 253         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 254         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 255
 256         .wait_for_init_deassert         = default_wait_for_init_deassert,
 257
 258         .smp_callin_clear_local_apic    = NULL,
 259         .inquire_remote_apic            = default_inquire_remote_apic,
 260
 261         .read                           = native_apic_mem_read,
 262         .write                          = native_apic_mem_write,
 263         .icr_read                       = native_apic_icr_read,
 264         .icr_write                      = native_apic_icr_write,
 265         .wait_icr_idle                  = native_apic_wait_icr_idle,
 266         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 267 };