arch/x86/kernel/apic/summit_32.c

   1 /*
   2  * IBM Summit-Specific Code
   3  *
   4  * Written By: Matthew Dobson, IBM Corporation
   5  *
   6  * Copyright (c) 2003 IBM Corp.
   7  *
   8  * All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or (at
  13  * your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  18  * NON INFRINGEMENT.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  24  *
  25  * Send feedback to <colpatch@us.ibm.com>
  26  *
  27  */
  28
  29 #include <linux/mm.h>
  30 #include <linux/init.h>
  31 #include <asm/io.h>
  32 #include <asm/bios_ebda.h>
  33
  34 /*
  35  * APIC driver for the IBM "Summit" chipset.
  36  */
  37 #include <linux/threads.h>
  38 #include <linux/cpumask.h>
  39 #include <asm/mpspec.h>
  40 #include <asm/apic.h>
  41 #include <asm/smp.h>
  42 #include <asm/fixmap.h>
  43 #include <asm/apicdef.h>
  44 #include <asm/ipi.h>
  45 #include <linux/kernel.h>
  46 #include <linux/string.h>
  47 #include <linux/init.h>
  48 #include <linux/gfp.h>
  49 #include <linux/smp.h>
  50
  51 static unsigned summit_get_apic_id(unsigned long x)
  52 {
  53         return (x >> 24) & 0xFF;
  54 }
  55
  56 static inline void summit_send_IPI_mask(const struct cpumask *mask, int vector)
  57 {
  58         default_send_IPI_mask_sequence_logical(mask, vector);
  59 }
  60
  61 static void summit_send_IPI_allbutself(int vector)
  62 {
  63         default_send_IPI_mask_allbutself_logical(cpu_online_mask, vector);
  64 }
  65
  66 static void summit_send_IPI_all(int vector)
  67 {
  68         summit_send_IPI_mask(cpu_online_mask, vector);
  69 }
  70
  71 #include <asm/tsc.h>
  72
  73 extern int use_cyclone;
  74
  75 #ifdef CONFIG_X86_SUMMIT_NUMA
  76 static void setup_summit(void);
  77 #else
  78 static inline void setup_summit(void) {}
  79 #endif
  80
  81 static int summit_mps_oem_check(struct mpc_table *mpc, char *oem,
  82                 char *productid)
  83 {
  84         if (!strncmp(oem, "IBM ENSW", 8) &&
  85                         (!strncmp(productid, "VIGIL SMP", 9)
  86                          || !strncmp(productid, "EXA", 3)
  87                          || !strncmp(productid, "RUTHLESS SMP", 12))){
  88                 mark_tsc_unstable("Summit based system");
  89                 use_cyclone = 1; /*enable cyclone-timer*/
  90                 setup_summit();
  91                 return 1;
  92         }
  93         return 0;
  94 }
  95
  96 /* Hook from generic ACPI tables.c */
  97 static int summit_acpi_madt_oem_check(char *oem_id, char *oem_table_id)
  98 {
  99         if (!strncmp(oem_id, "IBM", 3) &&
 100             (!strncmp(oem_table_id, "SERVIGIL", 8)
 101              || !strncmp(oem_table_id, "EXA", 3))){
 102                 mark_tsc_unstable("Summit based system");
 103                 use_cyclone = 1; /*enable cyclone-timer*/
 104                 setup_summit();
 105                 return 1;
 106         }
 107         return 0;
 108 }
 109
 110 struct rio_table_hdr {
 111         unsigned char version;      /* Version number of this data structure           */
 112                                     /* Version 3 adds chassis_num & WP_index           */
 113         unsigned char num_scal_dev; /* # of Scalability devices (Twisters for Vigil)   */
 114         unsigned char num_rio_dev;  /* # of RIO I/O devices (Cyclones and Winnipegs)   */
 115 } __attribute__((packed));
 116
 117 struct scal_detail {
 118         unsigned char node_id;      /* Scalability Node ID                             */
 119         unsigned long CBAR;         /* Address of 1MB register space                   */
 120         unsigned char port0node;    /* Node ID port connected to: 0xFF=None            */
 121         unsigned char port0port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
 122         unsigned char port1node;    /* Node ID port connected to: 0xFF = None          */
 123         unsigned char port1port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
 124         unsigned char port2node;    /* Node ID port connected to: 0xFF = None          */
 125         unsigned char port2port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
 126         unsigned char chassis_num;  /* 1 based Chassis number (1 = boot node)          */
 127 } __attribute__((packed));
 128
 129 struct rio_detail {
 130         unsigned char node_id;      /* RIO Node ID                                     */
 131         unsigned long BBAR;         /* Address of 1MB register space                   */
 132         unsigned char type;         /* Type of device                                  */
 133         unsigned char owner_id;     /* For WPEG: Node ID of Cyclone that owns this WPEG*/
 134                                     /* For CYC:  Node ID of Twister that owns this CYC */
 135         unsigned char port0node;    /* Node ID port connected to: 0xFF=None            */
 136         unsigned char port0port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
 137         unsigned char port1node;    /* Node ID port connected to: 0xFF=None            */
 138         unsigned char port1port;    /* Port num port connected to: 0,1,2, or 0xFF=None */
 139         unsigned char first_slot;   /* For WPEG: Lowest slot number below this WPEG    */
 140                                     /* For CYC:  0                                     */
 141         unsigned char status;       /* For WPEG: Bit 0 = 1 : the XAPIC is used         */
 142                                     /*                 = 0 : the XAPIC is not used, ie:*/
 143                                     /*                     ints fwded to another XAPIC */
 144                                     /*           Bits1:7 Reserved                      */
 145                                     /* For CYC:  Bits0:7 Reserved                      */
 146         unsigned char WP_index;     /* For WPEG: WPEG instance index - lower ones have */
 147                                     /*           lower slot numbers/PCI bus numbers    */
 148                                     /* For CYC:  No meaning                            */
 149         unsigned char chassis_num;  /* 1 based Chassis number                          */
 150                                     /* For LookOut WPEGs this field indicates the      */
 151                                     /* Expansion Chassis #, enumerated from Boot       */
 152                                     /* Node WPEG external port, then Boot Node CYC     */
 153                                     /* external port, then Next Vigil chassis WPEG     */
 154                                     /* external port, etc.                             */
 155                                     /* Shared Lookouts have only 1 chassis number (the */
 156                                     /* first one assigned)                             */
 157 } __attribute__((packed));
 158
 159
 160 typedef enum {
 161         CompatTwister = 0,  /* Compatibility Twister               */
 162         AltTwister    = 1,  /* Alternate Twister of internal 8-way */
 163         CompatCyclone = 2,  /* Compatibility Cyclone               */
 164         AltCyclone    = 3,  /* Alternate Cyclone of internal 8-way */
 165         CompatWPEG    = 4,  /* Compatibility WPEG                  */
 166         AltWPEG       = 5,  /* Second Planar WPEG                  */
 167         LookOutAWPEG  = 6,  /* LookOut WPEG                        */
 168         LookOutBWPEG  = 7,  /* LookOut WPEG                        */
 169 } node_type;
 170
 171 static inline int is_WPEG(struct rio_detail *rio){
 172         return (rio->type == CompatWPEG || rio->type == AltWPEG ||
 173                 rio->type == LookOutAWPEG || rio->type == LookOutBWPEG);
 174 }
 175
 176
 177 /* In clustered mode, the high nibble of APIC ID is a cluster number.
 178  * The low nibble is a 4-bit bitmap. */
 179 #define XAPIC_DEST_CPUS_SHIFT   4
 180 #define XAPIC_DEST_CPUS_MASK    ((1u << XAPIC_DEST_CPUS_SHIFT) - 1)
 181 #define XAPIC_DEST_CLUSTER_MASK (XAPIC_DEST_CPUS_MASK << XAPIC_DEST_CPUS_SHIFT)
 182
 183 #define SUMMIT_APIC_DFR_VALUE   (APIC_DFR_CLUSTER)
 184
 185 static const struct cpumask *summit_target_cpus(void)
 186 {
 187         /* CPU_MASK_ALL (0xff) has undefined behaviour with
 188          * dest_LowestPrio mode logical clustered apic interrupt routing
 189          * Just start on cpu 0.  IRQ balancing will spread load
 190          */
 191         return cpumask_of(0);
 192 }
 193
 194 static unsigned long summit_check_apicid_used(physid_mask_t bitmap, int apicid)
 195 {
 196         return 0;
 197 }
 198
 199 /* we don't use the phys_cpu_present_map to indicate apicid presence */
 200 static unsigned long summit_check_apicid_present(int bit)
 201 {
 202         return 1;
 203 }
 204
 205 static void summit_init_apic_ldr(void)
 206 {
 207         unsigned long val, id;
 208         int count = 0;
 209         u8 my_id = (u8)hard_smp_processor_id();
 210         u8 my_cluster = APIC_CLUSTER(my_id);
 211 #ifdef CONFIG_SMP
 212         u8 lid;
 213         int i;
 214
 215         /* Create logical APIC IDs by counting CPUs already in cluster. */
 216         for (count = 0, i = nr_cpu_ids; --i >= 0; ) {
 217                 lid = cpu_2_logical_apicid[i];
 218                 if (lid != BAD_APICID && APIC_CLUSTER(lid) == my_cluster)
 219                         ++count;
 220         }
 221 #endif
 222         /* We only have a 4 wide bitmap in cluster mode.  If a deranged
 223          * BIOS puts 5 CPUs in one APIC cluster, we're hosed. */
 224         BUG_ON(count >= XAPIC_DEST_CPUS_SHIFT);
 225         id = my_cluster | (1UL << count);
 226         apic_write(APIC_DFR, SUMMIT_APIC_DFR_VALUE);
 227         val = apic_read(APIC_LDR) & ~APIC_LDR_MASK;
 228         val |= SET_APIC_LOGICAL_ID(id);
 229         apic_write(APIC_LDR, val);
 230 }
 231
 232 static int summit_apic_id_registered(void)
 233 {
 234         return 1;
 235 }
 236
 237 static void summit_setup_apic_routing(void)
 238 {
 239         printk("Enabling APIC mode:  Summit.  Using %d I/O APICs\n",
 240                                                 nr_ioapics);
 241 }
 242
 243 static int summit_apicid_to_node(int logical_apicid)
 244 {
 245 #ifdef CONFIG_SMP
 246         return apicid_2_node[hard_smp_processor_id()];
 247 #else
 248         return 0;
 249 #endif
 250 }
 251
 252 /* Mapping from cpu number to logical apicid */
 253 static inline int summit_cpu_to_logical_apicid(int cpu)
 254 {
 255 #ifdef CONFIG_SMP
 256         if (cpu >= nr_cpu_ids)
 257                 return BAD_APICID;
 258         return cpu_2_logical_apicid[cpu];
 259 #else
 260         return logical_smp_processor_id();
 261 #endif
 262 }
 263
 264 static int summit_cpu_present_to_apicid(int mps_cpu)
 265 {
 266         if (mps_cpu < nr_cpu_ids)
 267                 return (int)per_cpu(x86_bios_cpu_apicid, mps_cpu);
 268         else
 269                 return BAD_APICID;
 270 }
 271
 272 static physid_mask_t summit_ioapic_phys_id_map(physid_mask_t phys_id_map)
 273 {
 274         /* For clustered we don't have a good way to do this yet - hack */
 275         return physids_promote(0x0F);
 276 }
 277
 278 static physid_mask_t summit_apicid_to_cpu_present(int apicid)
 279 {
 280         return physid_mask_of_physid(0);
 281 }
 282
 283 static int summit_check_phys_apicid_present(int boot_cpu_physical_apicid)
 284 {
 285         return 1;
 286 }
 287
 288 static unsigned int summit_cpu_mask_to_apicid(const struct cpumask *cpumask)
 289 {
 290         unsigned int round = 0;
 291         int cpu, apicid = 0;
 292
 293         /*
 294          * The cpus in the mask must all be on the apic cluster.
 295          */
 296         for_each_cpu(cpu, cpumask) {
 297                 int new_apicid = summit_cpu_to_logical_apicid(cpu);
 298
 299                 if (round && APIC_CLUSTER(apicid) != APIC_CLUSTER(new_apicid)) {
 300                         printk("%s: Not a valid mask!\n", __func__);
 301                         return BAD_APICID;
 302                 }
 303                 apicid |= new_apicid;
 304                 round++;
 305         }
 306         return apicid;
 307 }
 308
 309 static unsigned int summit_cpu_mask_to_apicid_and(const struct cpumask *inmask,
 310                               const struct cpumask *andmask)
 311 {
 312         int apicid = summit_cpu_to_logical_apicid(0);
 313         cpumask_var_t cpumask;
 314
 315         if (!alloc_cpumask_var(&cpumask, GFP_ATOMIC))
 316                 return apicid;
 317
 318         cpumask_and(cpumask, inmask, andmask);
 319         cpumask_and(cpumask, cpumask, cpu_online_mask);
 320         apicid = summit_cpu_mask_to_apicid(cpumask);
 321
 322         free_cpumask_var(cpumask);
 323
 324         return apicid;
 325 }
 326
 327 /*
 328  * cpuid returns the value latched in the HW at reset, not the APIC ID
 329  * register's value.  For any box whose BIOS changes APIC IDs, like
 330  * clustered APIC systems, we must use hard_smp_processor_id.
 331  *
 332  * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID.
 333  */
 334 static int summit_phys_pkg_id(int cpuid_apic, int index_msb)
 335 {
 336         return hard_smp_processor_id() >> index_msb;
 337 }
 338
 339 static int probe_summit(void)
 340 {
 341         /* probed later in mptable/ACPI hooks */
 342         return 0;
 343 }
 344
 345 static void summit_vector_allocation_domain(int cpu, struct cpumask *retmask)
 346 {
 347         /* Careful. Some cpus do not strictly honor the set of cpus
 348          * specified in the interrupt destination when using lowest
 349          * priority interrupt delivery mode.
 350          *
 351          * In particular there was a hyperthreading cpu observed to
 352          * deliver interrupts to the wrong hyperthread when only one
 353          * hyperthread was specified in the interrupt desitination.
 354          */
 355         cpumask_clear(retmask);
 356         cpumask_bits(retmask)[0] = APIC_ALL_CPUS;
 357 }
 358
 359 #ifdef CONFIG_X86_SUMMIT_NUMA
 360 static struct rio_table_hdr *rio_table_hdr;
 361 static struct scal_detail   *scal_devs[MAX_NUMNODES];
 362 static struct rio_detail    *rio_devs[MAX_NUMNODES*4];
 363
 364 #ifndef CONFIG_X86_NUMAQ
 365 static int mp_bus_id_to_node[MAX_MP_BUSSES];
 366 #endif
 367
 368 static int setup_pci_node_map_for_wpeg(int wpeg_num, int last_bus)
 369 {
 370         int twister = 0, node = 0;
 371         int i, bus, num_buses;
 372
 373         for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
 374                 if (rio_devs[i]->node_id == rio_devs[wpeg_num]->owner_id) {
 375                         twister = rio_devs[i]->owner_id;
 376                         break;
 377                 }
 378         }
 379         if (i == rio_table_hdr->num_rio_dev) {
 380                 printk(KERN_ERR "%s: Couldn't find owner Cyclone for Winnipeg!\n", __func__);
 381                 return last_bus;
 382         }
 383
 384         for (i = 0; i < rio_table_hdr->num_scal_dev; i++) {
 385                 if (scal_devs[i]->node_id == twister) {
 386                         node = scal_devs[i]->node_id;
 387                         break;
 388                 }
 389         }
 390         if (i == rio_table_hdr->num_scal_dev) {
 391                 printk(KERN_ERR "%s: Couldn't find owner Twister for Cyclone!\n", __func__);
 392                 return last_bus;
 393         }
 394
 395         switch (rio_devs[wpeg_num]->type) {
 396         case CompatWPEG:
 397                 /*
 398                  * The Compatibility Winnipeg controls the 2 legacy buses,
 399                  * the 66MHz PCI bus [2 slots] and the 2 "extra" buses in case
 400                  * a PCI-PCI bridge card is used in either slot: total 5 buses.
 401                  */
 402                 num_buses = 5;
 403                 break;
 404         case AltWPEG:
 405                 /*
 406                  * The Alternate Winnipeg controls the 2 133MHz buses [1 slot
 407                  * each], their 2 "extra" buses, the 100MHz bus [2 slots] and
 408                  * the "extra" buses for each of those slots: total 7 buses.
 409                  */
 410                 num_buses = 7;
 411                 break;
 412         case LookOutAWPEG:
 413         case LookOutBWPEG:
 414                 /*
 415                  * A Lookout Winnipeg controls 3 100MHz buses [2 slots each]
 416                  * & the "extra" buses for each of those slots: total 9 buses.
 417                  */
 418                 num_buses = 9;
 419                 break;
 420         default:
 421                 printk(KERN_INFO "%s: Unsupported Winnipeg type!\n", __func__);
 422                 return last_bus;
 423         }
 424
 425         for (bus = last_bus; bus < last_bus + num_buses; bus++)
 426                 mp_bus_id_to_node[bus] = node;
 427         return bus;
 428 }
 429
 430 static int build_detail_arrays(void)
 431 {
 432         unsigned long ptr;
 433         int i, scal_detail_size, rio_detail_size;
 434
 435         if (rio_table_hdr->num_scal_dev > MAX_NUMNODES) {
 436                 printk(KERN_WARNING "%s: MAX_NUMNODES too low!  Defined as %d, but system has %d nodes.\n", __func__, MAX_NUMNODES, rio_table_hdr->num_scal_dev);
 437                 return 0;
 438         }
 439
 440         switch (rio_table_hdr->version) {
 441         default:
 442                 printk(KERN_WARNING "%s: Invalid Rio Grande Table Version: %d\n", __func__, rio_table_hdr->version);
 443                 return 0;
 444         case 2:
 445                 scal_detail_size = 11;
 446                 rio_detail_size = 13;
 447                 break;
 448         case 3:
 449                 scal_detail_size = 12;
 450                 rio_detail_size = 15;
 451                 break;
 452         }
 453
 454         ptr = (unsigned long)rio_table_hdr + 3;
 455         for (i = 0; i < rio_table_hdr->num_scal_dev; i++, ptr += scal_detail_size)
 456                 scal_devs[i] = (struct scal_detail *)ptr;
 457
 458         for (i = 0; i < rio_table_hdr->num_rio_dev; i++, ptr += rio_detail_size)
 459                 rio_devs[i] = (struct rio_detail *)ptr;
 460
 461         return 1;
 462 }
 463
 464 void setup_summit(void)
 465 {
 466         unsigned long           ptr;
 467         unsigned short          offset;
 468         int                     i, next_wpeg, next_bus = 0;
 469
 470         /* The pointer to the EBDA is stored in the word @ phys 0x40E(40:0E) */
 471         ptr = get_bios_ebda();
 472         ptr = (unsigned long)phys_to_virt(ptr);
 473
 474         rio_table_hdr = NULL;
 475         offset = 0x180;
 476         while (offset) {
 477                 /* The block id is stored in the 2nd word */
 478                 if (*((unsigned short *)(ptr + offset + 2)) == 0x4752) {
 479                         /* set the pointer past the offset & block id */
 480                         rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
 481                         break;
 482                 }
 483                 /* The next offset is stored in the 1st word.  0 means no more */
 484                 offset = *((unsigned short *)(ptr + offset));
 485         }
 486         if (!rio_table_hdr) {
 487                 printk(KERN_ERR "%s: Unable to locate Rio Grande Table in EBDA - bailing!\n", __func__);
 488                 return;
 489         }
 490
 491         if (!build_detail_arrays())
 492                 return;
 493
 494         /* The first Winnipeg we're looking for has an index of 0 */
 495         next_wpeg = 0;
 496         do {
 497                 for (i = 0; i < rio_table_hdr->num_rio_dev; i++) {
 498                         if (is_WPEG(rio_devs[i]) && rio_devs[i]->WP_index == next_wpeg) {
 499                                 /* It's the Winnipeg we're looking for! */
 500                                 next_bus = setup_pci_node_map_for_wpeg(i, next_bus);
 501                                 next_wpeg++;
 502                                 break;
 503                         }
 504                 }
 505                 /*
 506                  * If we go through all Rio devices and don't find one with
 507                  * the next index, it means we've found all the Winnipegs,
 508                  * and thus all the PCI buses.
 509                  */
 510                 if (i == rio_table_hdr->num_rio_dev)
 511                         next_wpeg = 0;
 512         } while (next_wpeg != 0);
 513 }
 514 #endif
 515
 516 struct apic apic_summit = {
 517
 518         .name                           = "summit",
 519         .probe                          = probe_summit,
 520         .acpi_madt_oem_check            = summit_acpi_madt_oem_check,
 521         .apic_id_registered             = summit_apic_id_registered,
 522
 523         .irq_delivery_mode              = dest_LowestPrio,
 524         /* logical delivery broadcast to all CPUs: */
 525         .irq_dest_mode                  = 1,
 526
 527         .target_cpus                    = summit_target_cpus,
 528         .disable_esr                    = 1,
 529         .dest_logical                   = APIC_DEST_LOGICAL,
 530         .check_apicid_used              = summit_check_apicid_used,
 531         .check_apicid_present           = summit_check_apicid_present,
 532
 533         .vector_allocation_domain       = summit_vector_allocation_domain,
 534         .init_apic_ldr                  = summit_init_apic_ldr,
 535
 536         .ioapic_phys_id_map             = summit_ioapic_phys_id_map,
 537         .setup_apic_routing             = summit_setup_apic_routing,
 538         .multi_timer_check              = NULL,
 539         .apicid_to_node                 = summit_apicid_to_node,
 540         .cpu_to_logical_apicid          = summit_cpu_to_logical_apicid,
 541         .cpu_present_to_apicid          = summit_cpu_present_to_apicid,
 542         .apicid_to_cpu_present          = summit_apicid_to_cpu_present,
 543         .setup_portio_remap             = NULL,
 544         .check_phys_apicid_present      = summit_check_phys_apicid_present,
 545         .enable_apic_mode               = NULL,
 546         .phys_pkg_id                    = summit_phys_pkg_id,
 547         .mps_oem_check                  = summit_mps_oem_check,
 548
 549         .get_apic_id                    = summit_get_apic_id,
 550         .set_apic_id                    = NULL,
 551         .apic_id_mask                   = 0xFF << 24,
 552
 553         .cpu_mask_to_apicid             = summit_cpu_mask_to_apicid,
 554         .cpu_mask_to_apicid_and         = summit_cpu_mask_to_apicid_and,
 555
 556         .send_IPI_mask                  = summit_send_IPI_mask,
 557         .send_IPI_mask_allbutself       = NULL,
 558         .send_IPI_allbutself            = summit_send_IPI_allbutself,
 559         .send_IPI_all                   = summit_send_IPI_all,
 560         .send_IPI_self                  = default_send_IPI_self,
 561
 562         .trampoline_phys_low            = DEFAULT_TRAMPOLINE_PHYS_LOW,
 563         .trampoline_phys_high           = DEFAULT_TRAMPOLINE_PHYS_HIGH,
 564
 565         .wait_for_init_deassert         = default_wait_for_init_deassert,
 566
 567         .smp_callin_clear_local_apic    = NULL,
 568         .inquire_remote_apic            = default_inquire_remote_apic,
 569
 570         .read                           = native_apic_mem_read,
 571         .write                          = native_apic_mem_write,
 572         .icr_read                       = native_apic_icr_read,
 573         .icr_write                      = native_apic_icr_write,
 574         .wait_icr_idle                  = native_apic_wait_icr_idle,
 575         .safe_wait_icr_idle             = native_safe_apic_wait_icr_idle,
 576 };