arch/x86/kernel/genx2apic_uv_x.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * SGI UV APIC functions (note: not an Intel compatible APIC)
   7  *
   8  * Copyright (C) 2007-2008 Silicon Graphics, Inc. All rights reserved.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/threads.h>
  13 #include <linux/cpumask.h>
  14 #include <linux/string.h>
  15 #include <linux/ctype.h>
  16 #include <linux/init.h>
  17 #include <linux/sched.h>
  18 #include <linux/module.h>
  19 #include <linux/hardirq.h>
  20 #include <asm/smp.h>
  21 #include <asm/ipi.h>
  22 #include <asm/genapic.h>
  23 #include <asm/pgtable.h>
  24 #include <asm/uv/uv_mmrs.h>
  25 #include <asm/uv/uv_hub.h>
  26 #include <asm/uv/bios.h>
  27
  28 DEFINE_PER_CPU(int, x2apic_extra_bits);
  29
  30 static enum uv_system_type uv_system_type;
  31
  32 static int uv_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  33 {
  34         if (!strcmp(oem_id, "SGI")) {
  35                 if (!strcmp(oem_table_id, "UVL"))
  36                         uv_system_type = UV_LEGACY_APIC;
  37                 else if (!strcmp(oem_table_id, "UVX"))
  38                         uv_system_type = UV_X2APIC;
  39                 else if (!strcmp(oem_table_id, "UVH")) {
  40                         uv_system_type = UV_NON_UNIQUE_APIC;
  41                         return 1;
  42                 }
  43         }
  44         return 0;
  45 }
  46
  47 enum uv_system_type get_uv_system_type(void)
  48 {
  49         return uv_system_type;
  50 }
  51
  52 int is_uv_system(void)
  53 {
  54         return uv_system_type != UV_NONE;
  55 }
  56 EXPORT_SYMBOL_GPL(is_uv_system);
  57
  58 DEFINE_PER_CPU(struct uv_hub_info_s, __uv_hub_info);
  59 EXPORT_PER_CPU_SYMBOL_GPL(__uv_hub_info);
  60
  61 struct uv_blade_info *uv_blade_info;
  62 EXPORT_SYMBOL_GPL(uv_blade_info);
  63
  64 short *uv_node_to_blade;
  65 EXPORT_SYMBOL_GPL(uv_node_to_blade);
  66
  67 short *uv_cpu_to_blade;
  68 EXPORT_SYMBOL_GPL(uv_cpu_to_blade);
  69
  70 short uv_possible_blades;
  71 EXPORT_SYMBOL_GPL(uv_possible_blades);
  72
  73 unsigned long sn_rtc_cycles_per_second;
  74 EXPORT_SYMBOL(sn_rtc_cycles_per_second);
  75
  76 /* Start with all IRQs pointing to boot CPU.  IRQ balancing will shift them. */
  77
  78 static cpumask_t uv_target_cpus(void)
  79 {
  80         return cpumask_of_cpu(0);
  81 }
  82
  83 static cpumask_t uv_vector_allocation_domain(int cpu)
  84 {
  85         cpumask_t domain = CPU_MASK_NONE;
  86         cpu_set(cpu, domain);
  87         return domain;
  88 }
  89
  90 int uv_wakeup_secondary(int phys_apicid, unsigned int start_rip)
  91 {
  92         unsigned long val;
  93         int pnode;
  94
  95         pnode = uv_apicid_to_pnode(phys_apicid);
  96         val = (1UL << UVH_IPI_INT_SEND_SHFT) |
  97             (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
  98             (((long)start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
  99             APIC_DM_INIT;
 100         uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 101         mdelay(10);
 102
 103         val = (1UL << UVH_IPI_INT_SEND_SHFT) |
 104             (phys_apicid << UVH_IPI_INT_APIC_ID_SHFT) |
 105             (((long)start_rip << UVH_IPI_INT_VECTOR_SHFT) >> 12) |
 106             APIC_DM_STARTUP;
 107         uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 108         return 0;
 109 }
 110
 111 static void uv_send_IPI_one(int cpu, int vector)
 112 {
 113         unsigned long val, apicid, lapicid;
 114         int pnode;
 115
 116         apicid = per_cpu(x86_cpu_to_apicid, cpu);
 117         lapicid = apicid & 0x3f;                /* ZZZ macro needed */
 118         pnode = uv_apicid_to_pnode(apicid);
 119         val =
 120             (1UL << UVH_IPI_INT_SEND_SHFT) | (lapicid <<
 121                                               UVH_IPI_INT_APIC_ID_SHFT) |
 122             (vector << UVH_IPI_INT_VECTOR_SHFT);
 123         uv_write_global_mmr64(pnode, UVH_IPI_INT, val);
 124 }
 125
 126 static void uv_send_IPI_mask(cpumask_t mask, int vector)
 127 {
 128         unsigned int cpu;
 129
 130         for_each_possible_cpu(cpu)
 131                 if (cpu_isset(cpu, mask))
 132                         uv_send_IPI_one(cpu, vector);
 133 }
 134
 135 static void uv_send_IPI_allbutself(int vector)
 136 {
 137         cpumask_t mask = cpu_online_map;
 138
 139         cpu_clear(smp_processor_id(), mask);
 140
 141         if (!cpus_empty(mask))
 142                 uv_send_IPI_mask(mask, vector);
 143 }
 144
 145 static void uv_send_IPI_all(int vector)
 146 {
 147         uv_send_IPI_mask(cpu_online_map, vector);
 148 }
 149
 150 static int uv_apic_id_registered(void)
 151 {
 152         return 1;
 153 }
 154
 155 static void uv_init_apic_ldr(void)
 156 {
 157 }
 158
 159 static unsigned int uv_cpu_mask_to_apicid(cpumask_t cpumask)
 160 {
 161         int cpu;
 162
 163         /*
 164          * We're using fixed IRQ delivery, can only return one phys APIC ID.
 165          * May as well be the first.
 166          */
 167         cpu = first_cpu(cpumask);
 168         if ((unsigned)cpu < nr_cpu_ids)
 169                 return per_cpu(x86_cpu_to_apicid, cpu);
 170         else
 171                 return BAD_APICID;
 172 }
 173
 174 static unsigned int get_apic_id(unsigned long x)
 175 {
 176         unsigned int id;
 177
 178         WARN_ON(preemptible() && num_online_cpus() > 1);
 179         id = x | __get_cpu_var(x2apic_extra_bits);
 180
 181         return id;
 182 }
 183
 184 static unsigned long set_apic_id(unsigned int id)
 185 {
 186         unsigned long x;
 187
 188         /* maskout x2apic_extra_bits ? */
 189         x = id;
 190         return x;
 191 }
 192
 193 static unsigned int uv_read_apic_id(void)
 194 {
 195
 196         return get_apic_id(apic_read(APIC_ID));
 197 }
 198
 199 static unsigned int phys_pkg_id(int index_msb)
 200 {
 201         return uv_read_apic_id() >> index_msb;
 202 }
 203
 204 static void uv_send_IPI_self(int vector)
 205 {
 206         apic_write(APIC_SELF_IPI, vector);
 207 }
 208
 209 struct genapic apic_x2apic_uv_x = {
 210         .name = "UV large system",
 211         .acpi_madt_oem_check = uv_acpi_madt_oem_check,
 212         .int_delivery_mode = dest_Fixed,
 213         .int_dest_mode = (APIC_DEST_PHYSICAL != 0),
 214         .target_cpus = uv_target_cpus,
 215         .vector_allocation_domain = uv_vector_allocation_domain,
 216         .apic_id_registered = uv_apic_id_registered,
 217         .init_apic_ldr = uv_init_apic_ldr,
 218         .send_IPI_all = uv_send_IPI_all,
 219         .send_IPI_allbutself = uv_send_IPI_allbutself,
 220         .send_IPI_mask = uv_send_IPI_mask,
 221         .send_IPI_self = uv_send_IPI_self,
 222         .cpu_mask_to_apicid = uv_cpu_mask_to_apicid,
 223         .phys_pkg_id = phys_pkg_id,
 224         .get_apic_id = get_apic_id,
 225         .set_apic_id = set_apic_id,
 226         .apic_id_mask = (0xFFFFFFFFu),
 227 };
 228
 229 static __cpuinit void set_x2apic_extra_bits(int pnode)
 230 {
 231         __get_cpu_var(x2apic_extra_bits) = (pnode << 6);
 232 }
 233
 234 /*
 235  * Called on boot cpu.
 236  */
 237 static __init int boot_pnode_to_blade(int pnode)
 238 {
 239         int blade;
 240
 241         for (blade = 0; blade < uv_num_possible_blades(); blade++)
 242                 if (pnode == uv_blade_info[blade].pnode)
 243                         return blade;
 244         BUG();
 245 }
 246
 247 struct redir_addr {
 248         unsigned long redirect;
 249         unsigned long alias;
 250 };
 251
 252 #define DEST_SHIFT UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR_DEST_BASE_SHFT
 253
 254 static __initdata struct redir_addr redir_addrs[] = {
 255         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_0_MMR, UVH_SI_ALIAS0_OVERLAY_CONFIG},
 256         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_1_MMR, UVH_SI_ALIAS1_OVERLAY_CONFIG},
 257         {UVH_RH_GAM_ALIAS210_REDIRECT_CONFIG_2_MMR, UVH_SI_ALIAS2_OVERLAY_CONFIG},
 258 };
 259
 260 static __init void get_lowmem_redirect(unsigned long *base, unsigned long *size)
 261 {
 262         union uvh_si_alias0_overlay_config_u alias;
 263         union uvh_rh_gam_alias210_redirect_config_2_mmr_u redirect;
 264         int i;
 265
 266         for (i = 0; i < ARRAY_SIZE(redir_addrs); i++) {
 267                 alias.v = uv_read_local_mmr(redir_addrs[i].alias);
 268                 if (alias.s.base == 0) {
 269                         *size = (1UL << alias.s.m_alias);
 270                         redirect.v = uv_read_local_mmr(redir_addrs[i].redirect);
 271                         *base = (unsigned long)redirect.s.dest_base << DEST_SHIFT;
 272                         return;
 273                 }
 274         }
 275         BUG();
 276 }
 277
 278 static __init void map_low_mmrs(void)
 279 {
 280         init_extra_mapping_uc(UV_GLOBAL_MMR32_BASE, UV_GLOBAL_MMR32_SIZE);
 281         init_extra_mapping_uc(UV_LOCAL_MMR_BASE, UV_LOCAL_MMR_SIZE);
 282 }
 283
 284 enum map_type {map_wb, map_uc};
 285
 286 static __init void map_high(char *id, unsigned long base, int shift,
 287                             int max_pnode, enum map_type map_type)
 288 {
 289         unsigned long bytes, paddr;
 290
 291         paddr = base << shift;
 292         bytes = (1UL << shift) * (max_pnode + 1);
 293         printk(KERN_INFO "UV: Map %s_HI 0x%lx - 0x%lx\n", id, paddr,
 294                                                 paddr + bytes);
 295         if (map_type == map_uc)
 296                 init_extra_mapping_uc(paddr, bytes);
 297         else
 298                 init_extra_mapping_wb(paddr, bytes);
 299
 300 }
 301 static __init void map_gru_high(int max_pnode)
 302 {
 303         union uvh_rh_gam_gru_overlay_config_mmr_u gru;
 304         int shift = UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR_BASE_SHFT;
 305
 306         gru.v = uv_read_local_mmr(UVH_RH_GAM_GRU_OVERLAY_CONFIG_MMR);
 307         if (gru.s.enable)
 308                 map_high("GRU", gru.s.base, shift, max_pnode, map_wb);
 309 }
 310
 311 static __init void map_config_high(int max_pnode)
 312 {
 313         union uvh_rh_gam_cfg_overlay_config_mmr_u cfg;
 314         int shift = UVH_RH_GAM_CFG_OVERLAY_CONFIG_MMR_BASE_SHFT;
 315
 316         cfg.v = uv_read_local_mmr(UVH_RH_GAM_CFG_OVERLAY_CONFIG_MMR);
 317         if (cfg.s.enable)
 318                 map_high("CONFIG", cfg.s.base, shift, max_pnode, map_uc);
 319 }
 320
 321 static __init void map_mmr_high(int max_pnode)
 322 {
 323         union uvh_rh_gam_mmr_overlay_config_mmr_u mmr;
 324         int shift = UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR_BASE_SHFT;
 325
 326         mmr.v = uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR);
 327         if (mmr.s.enable)
 328                 map_high("MMR", mmr.s.base, shift, max_pnode, map_uc);
 329 }
 330
 331 static __init void map_mmioh_high(int max_pnode)
 332 {
 333         union uvh_rh_gam_mmioh_overlay_config_mmr_u mmioh;
 334         int shift = UVH_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR_BASE_SHFT;
 335
 336         mmioh.v = uv_read_local_mmr(UVH_RH_GAM_MMIOH_OVERLAY_CONFIG_MMR);
 337         if (mmioh.s.enable)
 338                 map_high("MMIOH", mmioh.s.base, shift, max_pnode, map_uc);
 339 }
 340
 341 static __init void uv_rtc_init(void)
 342 {
 343         long status;
 344         u64 ticks_per_sec;
 345
 346         status = uv_bios_freq_base(BIOS_FREQ_BASE_REALTIME_CLOCK,
 347                                         &ticks_per_sec);
 348         if (status != BIOS_STATUS_SUCCESS || ticks_per_sec < 100000) {
 349                 printk(KERN_WARNING
 350                         "unable to determine platform RTC clock frequency, "
 351                         "guessing.\n");
 352                 /* BIOS gives wrong value for clock freq. so guess */
 353                 sn_rtc_cycles_per_second = 1000000000000UL / 30000UL;
 354         } else
 355                 sn_rtc_cycles_per_second = ticks_per_sec;
 356 }
 357
 358 /*
 359  * Called on each cpu to initialize the per_cpu UV data area.
 360  *      ZZZ hotplug not supported yet
 361  */
 362 void __cpuinit uv_cpu_init(void)
 363 {
 364         /* CPU 0 initilization will be done via uv_system_init. */
 365         if (!uv_blade_info)
 366                 return;
 367
 368         uv_blade_info[uv_numa_blade_id()].nr_online_cpus++;
 369
 370         if (get_uv_system_type() == UV_NON_UNIQUE_APIC)
 371                 set_x2apic_extra_bits(uv_hub_info->pnode);
 372 }
 373
 374
 375 void __init uv_system_init(void)
 376 {
 377         union uvh_si_addr_map_config_u m_n_config;
 378         union uvh_node_id_u node_id;
 379         unsigned long gnode_upper, lowmem_redir_base, lowmem_redir_size;
 380         int bytes, nid, cpu, lcpu, pnode, blade, i, j, m_val, n_val;
 381         int max_pnode = 0;
 382         unsigned long mmr_base, present;
 383
 384         map_low_mmrs();
 385
 386         m_n_config.v = uv_read_local_mmr(UVH_SI_ADDR_MAP_CONFIG);
 387         m_val = m_n_config.s.m_skt;
 388         n_val = m_n_config.s.n_skt;
 389         mmr_base =
 390             uv_read_local_mmr(UVH_RH_GAM_MMR_OVERLAY_CONFIG_MMR) &
 391             ~UV_MMR_ENABLE;
 392         printk(KERN_DEBUG "UV: global MMR base 0x%lx\n", mmr_base);
 393
 394         for(i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++)
 395                 uv_possible_blades +=
 396                   hweight64(uv_read_local_mmr( UVH_NODE_PRESENT_TABLE + i * 8));
 397         printk(KERN_DEBUG "UV: Found %d blades\n", uv_num_possible_blades());
 398
 399         bytes = sizeof(struct uv_blade_info) * uv_num_possible_blades();
 400         uv_blade_info = kmalloc(bytes, GFP_KERNEL);
 401
 402         get_lowmem_redirect(&lowmem_redir_base, &lowmem_redir_size);
 403
 404         bytes = sizeof(uv_node_to_blade[0]) * num_possible_nodes();
 405         uv_node_to_blade = kmalloc(bytes, GFP_KERNEL);
 406         memset(uv_node_to_blade, 255, bytes);
 407
 408         bytes = sizeof(uv_cpu_to_blade[0]) * num_possible_cpus();
 409         uv_cpu_to_blade = kmalloc(bytes, GFP_KERNEL);
 410         memset(uv_cpu_to_blade, 255, bytes);
 411
 412         blade = 0;
 413         for (i = 0; i < UVH_NODE_PRESENT_TABLE_DEPTH; i++) {
 414                 present = uv_read_local_mmr(UVH_NODE_PRESENT_TABLE + i * 8);
 415                 for (j = 0; j < 64; j++) {
 416                         if (!test_bit(j, &present))
 417                                 continue;
 418                         uv_blade_info[blade].pnode = (i * 64 + j);
 419                         uv_blade_info[blade].nr_possible_cpus = 0;
 420                         uv_blade_info[blade].nr_online_cpus = 0;
 421                         blade++;
 422                 }
 423         }
 424
 425         node_id.v = uv_read_local_mmr(UVH_NODE_ID);
 426         gnode_upper = (((unsigned long)node_id.s.node_id) &
 427                        ~((1 << n_val) - 1)) << m_val;
 428
 429         uv_bios_init();
 430         uv_bios_get_sn_info(0, &uv_type, &sn_partition_id,
 431                             &uv_coherency_id, &uv_region_size);
 432         uv_rtc_init();
 433
 434         for_each_present_cpu(cpu) {
 435                 nid = cpu_to_node(cpu);
 436                 pnode = uv_apicid_to_pnode(per_cpu(x86_cpu_to_apicid, cpu));
 437                 blade = boot_pnode_to_blade(pnode);
 438                 lcpu = uv_blade_info[blade].nr_possible_cpus;
 439                 uv_blade_info[blade].nr_possible_cpus++;
 440
 441                 uv_cpu_hub_info(cpu)->lowmem_remap_base = lowmem_redir_base;
 442                 uv_cpu_hub_info(cpu)->lowmem_remap_top =
 443                                         lowmem_redir_base + lowmem_redir_size;
 444                 uv_cpu_hub_info(cpu)->m_val = m_val;
 445                 uv_cpu_hub_info(cpu)->n_val = m_val;
 446                 uv_cpu_hub_info(cpu)->numa_blade_id = blade;
 447                 uv_cpu_hub_info(cpu)->blade_processor_id = lcpu;
 448                 uv_cpu_hub_info(cpu)->pnode = pnode;
 449                 uv_cpu_hub_info(cpu)->pnode_mask = (1 << n_val) - 1;
 450                 uv_cpu_hub_info(cpu)->gpa_mask = (1 << (m_val + n_val)) - 1;
 451                 uv_cpu_hub_info(cpu)->gnode_upper = gnode_upper;
 452                 uv_cpu_hub_info(cpu)->global_mmr_base = mmr_base;
 453                 uv_cpu_hub_info(cpu)->coherency_domain_number = uv_coherency_id;
 454                 uv_node_to_blade[nid] = blade;
 455                 uv_cpu_to_blade[cpu] = blade;
 456                 max_pnode = max(pnode, max_pnode);
 457
 458                 printk(KERN_DEBUG "UV: cpu %d, apicid 0x%x, pnode %d, nid %d, "
 459                         "lcpu %d, blade %d\n",
 460                         cpu, per_cpu(x86_cpu_to_apicid, cpu), pnode, nid,
 461                         lcpu, blade);
 462         }
 463
 464         map_gru_high(max_pnode);
 465         map_mmr_high(max_pnode);
 466         map_config_high(max_pnode);
 467         map_mmioh_high(max_pnode);
 468
 469         uv_cpu_init();
 470 }