arch/powerpc/platforms/pseries/setup.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  64-bit pSeries and RS/6000 setup code.
   4  *
   5  *  Copyright (C) 1995  Linus Torvalds
   6  *  Adapted from 'alpha' version by Gary Thomas
   7  *  Modified by Cort Dougan (cort@cs.nmt.edu)
   8  *  Modified by PPC64 Team, IBM Corp
   9  */
  10
  11 /*
  12  * bootup setup stuff..
  13  */
  14
  15 #include <linux/cpu.h>
  16 #include <linux/errno.h>
  17 #include <linux/sched.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/stddef.h>
  21 #include <linux/unistd.h>
  22 #include <linux/user.h>
  23 #include <linux/tty.h>
  24 #include <linux/major.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/reboot.h>
  27 #include <linux/init.h>
  28 #include <linux/ioport.h>
  29 #include <linux/console.h>
  30 #include <linux/pci.h>
  31 #include <linux/utsname.h>
  32 #include <linux/adb.h>
  33 #include <linux/export.h>
  34 #include <linux/delay.h>
  35 #include <linux/irq.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/root_dev.h>
  38 #include <linux/of.h>
  39 #include <linux/of_pci.h>
  40 #include <linux/memblock.h>
  41 #include <linux/swiotlb.h>
  42
  43 #include <asm/mmu.h>
  44 #include <asm/processor.h>
  45 #include <asm/io.h>
  46 #include <asm/prom.h>
  47 #include <asm/rtas.h>
  48 #include <asm/pci-bridge.h>
  49 #include <asm/iommu.h>
  50 #include <asm/dma.h>
  51 #include <asm/machdep.h>
  52 #include <asm/irq.h>
  53 #include <asm/time.h>
  54 #include <asm/nvram.h>
  55 #include <asm/pmc.h>
  56 #include <asm/xics.h>
  57 #include <asm/xive.h>
  58 #include <asm/ppc-pci.h>
  59 #include <asm/i8259.h>
  60 #include <asm/udbg.h>
  61 #include <asm/smp.h>
  62 #include <asm/firmware.h>
  63 #include <asm/eeh.h>
  64 #include <asm/reg.h>
  65 #include <asm/plpar_wrappers.h>
  66 #include <asm/kexec.h>
  67 #include <asm/isa-bridge.h>
  68 #include <asm/security_features.h>
  69 #include <asm/asm-const.h>
  70 #include <asm/idle.h>
  71 #include <asm/swiotlb.h>
  72 #include <asm/svm.h>
  73 #include <asm/dtl.h>
  74 #include <asm/hvconsole.h>
  75
  76 #include "pseries.h"
  77 #include "../../../../drivers/pci/pci.h"
  78
  79 DEFINE_STATIC_KEY_FALSE(shared_processor);
  80 EXPORT_SYMBOL_GPL(shared_processor);
  81
  82 int CMO_PrPSP = -1;
  83 int CMO_SecPSP = -1;
  84 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
  85 EXPORT_SYMBOL(CMO_PageSize);
  86
  87 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  88 int ibm_nmi_interlock_token;
  89 u32 pseries_security_flavor;
  90
  91 static void pSeries_show_cpuinfo(struct seq_file *m)
  92 {
  93         struct device_node *root;
  94         const char *model = "";
  95
  96         root = of_find_node_by_path("/");
  97         if (root)
  98                 model = of_get_property(root, "model", NULL);
  99         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 100         of_node_put(root);
 101         if (radix_enabled())
 102                 seq_printf(m, "MMU\t\t: Radix\n");
 103         else
 104                 seq_printf(m, "MMU\t\t: Hash\n");
 105 }
 106
 107 /* Initialize firmware assisted non-maskable interrupts if
 108  * the firmware supports this feature.
 109  */
 110 static void __init fwnmi_init(void)
 111 {
 112         unsigned long system_reset_addr, machine_check_addr;
 113         u8 *mce_data_buf;
 114         unsigned int i;
 115         int nr_cpus = num_possible_cpus();
 116 #ifdef CONFIG_PPC_BOOK3S_64
 117         struct slb_entry *slb_ptr;
 118         size_t size;
 119 #endif
 120         int ibm_nmi_register_token;
 121
 122         ibm_nmi_register_token = rtas_token("ibm,nmi-register");
 123         if (ibm_nmi_register_token == RTAS_UNKNOWN_SERVICE)
 124                 return;
 125
 126         ibm_nmi_interlock_token = rtas_token("ibm,nmi-interlock");
 127         if (WARN_ON(ibm_nmi_interlock_token == RTAS_UNKNOWN_SERVICE))
 128                 return;
 129
 130         /* If the kernel's not linked at zero we point the firmware at low
 131          * addresses anyway, and use a trampoline to get to the real code. */
 132         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 133         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 134
 135         if (0 == rtas_call(ibm_nmi_register_token, 2, 1, NULL,
 136                            system_reset_addr, machine_check_addr))
 137                 fwnmi_active = 1;
 138
 139         /*
 140          * Allocate a chunk for per cpu buffer to hold rtas errorlog.
 141          * It will be used in real mode mce handler, hence it needs to be
 142          * below RMA.
 143          */
 144         mce_data_buf = memblock_alloc_try_nid_raw(RTAS_ERROR_LOG_MAX * nr_cpus,
 145                                         RTAS_ERROR_LOG_MAX, MEMBLOCK_LOW_LIMIT,
 146                                         ppc64_rma_size, NUMA_NO_NODE);
 147         if (!mce_data_buf)
 148                 panic("Failed to allocate %d bytes below %pa for MCE buffer\n",
 149                       RTAS_ERROR_LOG_MAX * nr_cpus, &ppc64_rma_size);
 150
 151         for_each_possible_cpu(i) {
 152                 paca_ptrs[i]->mce_data_buf = mce_data_buf +
 153                                                 (RTAS_ERROR_LOG_MAX * i);
 154         }
 155
 156 #ifdef CONFIG_PPC_BOOK3S_64
 157         if (!radix_enabled()) {
 158                 /* Allocate per cpu area to save old slb contents during MCE */
 159                 size = sizeof(struct slb_entry) * mmu_slb_size * nr_cpus;
 160                 slb_ptr = memblock_alloc_try_nid_raw(size,
 161                                 sizeof(struct slb_entry), MEMBLOCK_LOW_LIMIT,
 162                                 ppc64_rma_size, NUMA_NO_NODE);
 163                 if (!slb_ptr)
 164                         panic("Failed to allocate %zu bytes below %pa for slb area\n",
 165                               size, &ppc64_rma_size);
 166
 167                 for_each_possible_cpu(i)
 168                         paca_ptrs[i]->mce_faulty_slbs = slb_ptr + (mmu_slb_size * i);
 169         }
 170 #endif
 171 }
 172
 173 static void pseries_8259_cascade(struct irq_desc *desc)
 174 {
 175         struct irq_chip *chip = irq_desc_get_chip(desc);
 176         unsigned int cascade_irq = i8259_irq();
 177
 178         if (cascade_irq)
 179                 generic_handle_irq(cascade_irq);
 180
 181         chip->irq_eoi(&desc->irq_data);
 182 }
 183
 184 static void __init pseries_setup_i8259_cascade(void)
 185 {
 186         struct device_node *np, *old, *found = NULL;
 187         unsigned int cascade;
 188         const u32 *addrp;
 189         unsigned long intack = 0;
 190         int naddr;
 191
 192         for_each_node_by_type(np, "interrupt-controller") {
 193                 if (of_device_is_compatible(np, "chrp,iic")) {
 194                         found = np;
 195                         break;
 196                 }
 197         }
 198
 199         if (found == NULL) {
 200                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 201                 return;
 202         }
 203
 204         cascade = irq_of_parse_and_map(found, 0);
 205         if (!cascade) {
 206                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 207                 return;
 208         }
 209         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 210
 211         for (old = of_node_get(found); old != NULL ; old = np) {
 212                 np = of_get_parent(old);
 213                 of_node_put(old);
 214                 if (np == NULL)
 215                         break;
 216                 if (!of_node_name_eq(np, "pci"))
 217                         continue;
 218                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 219                 if (addrp == NULL)
 220                         continue;
 221                 naddr = of_n_addr_cells(np);
 222                 intack = addrp[naddr-1];
 223                 if (naddr > 1)
 224                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 225         }
 226         if (intack)
 227                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 228         i8259_init(found, intack);
 229         of_node_put(found);
 230         irq_set_chained_handler(cascade, pseries_8259_cascade);
 231 }
 232
 233 static void __init pseries_init_irq(void)
 234 {
 235         /* Try using a XIVE if available, otherwise use a XICS */
 236         if (!xive_spapr_init()) {
 237                 xics_init();
 238                 pseries_setup_i8259_cascade();
 239         }
 240 }
 241
 242 static void pseries_lpar_enable_pmcs(void)
 243 {
 244         unsigned long set, reset;
 245
 246         set = 1UL << 63;
 247         reset = 0;
 248         plpar_hcall_norets(H_PERFMON, set, reset);
 249 }
 250
 251 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
 252 {
 253         struct of_reconfig_data *rd = data;
 254         struct device_node *parent, *np = rd->dn;
 255         struct pci_dn *pdn;
 256         int err = NOTIFY_OK;
 257
 258         switch (action) {
 259         case OF_RECONFIG_ATTACH_NODE:
 260                 parent = of_get_parent(np);
 261                 pdn = parent ? PCI_DN(parent) : NULL;
 262                 if (pdn)
 263                         pci_add_device_node_info(pdn->phb, np);
 264
 265                 of_node_put(parent);
 266                 break;
 267         case OF_RECONFIG_DETACH_NODE:
 268                 pdn = PCI_DN(np);
 269                 if (pdn)
 270                         list_del(&pdn->list);
 271                 break;
 272         default:
 273                 err = NOTIFY_DONE;
 274                 break;
 275         }
 276         return err;
 277 }
 278
 279 static struct notifier_block pci_dn_reconfig_nb = {
 280         .notifier_call = pci_dn_reconfig_notifier,
 281 };
 282
 283 struct kmem_cache *dtl_cache;
 284
 285 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 286 /*
 287  * Allocate space for the dispatch trace log for all possible cpus
 288  * and register the buffers with the hypervisor.  This is used for
 289  * computing time stolen by the hypervisor.
 290  */
 291 static int alloc_dispatch_logs(void)
 292 {
 293         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 294                 return 0;
 295
 296         if (!dtl_cache)
 297                 return 0;
 298
 299         alloc_dtl_buffers(0);
 300
 301         /* Register the DTL for the current (boot) cpu */
 302         register_dtl_buffer(smp_processor_id());
 303
 304         return 0;
 305 }
 306 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 307 static inline int alloc_dispatch_logs(void)
 308 {
 309         return 0;
 310 }
 311 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 312
 313 static int alloc_dispatch_log_kmem_cache(void)
 314 {
 315         void (*ctor)(void *) = get_dtl_cache_ctor();
 316
 317         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 318                                                 DISPATCH_LOG_BYTES, 0, ctor);
 319         if (!dtl_cache) {
 320                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 321                 pr_warn("Stolen time statistics will be unreliable\n");
 322                 return 0;
 323         }
 324
 325         return alloc_dispatch_logs();
 326 }
 327 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
 328
 329 DEFINE_PER_CPU(u64, idle_spurr_cycles);
 330 DEFINE_PER_CPU(u64, idle_entry_purr_snap);
 331 DEFINE_PER_CPU(u64, idle_entry_spurr_snap);
 332 static void pseries_lpar_idle(void)
 333 {
 334         /*
 335          * Default handler to go into low thread priority and possibly
 336          * low power mode by ceding processor to hypervisor
 337          */
 338
 339         if (!prep_irq_for_idle())
 340                 return;
 341
 342         /* Indicate to hypervisor that we are idle. */
 343         pseries_idle_prolog();
 344
 345         /*
 346          * Yield the processor to the hypervisor.  We return if
 347          * an external interrupt occurs (which are driven prior
 348          * to returning here) or if a prod occurs from another
 349          * processor. When returning here, external interrupts
 350          * are enabled.
 351          */
 352         cede_processor();
 353
 354         pseries_idle_epilog();
 355 }
 356
 357 /*
 358  * Enable relocation on during exceptions. This has partition wide scope and
 359  * may take a while to complete, if it takes longer than one second we will
 360  * just give up rather than wasting any more time on this - if that turns out
 361  * to ever be a problem in practice we can move this into a kernel thread to
 362  * finish off the process later in boot.
 363  */
 364 bool pseries_enable_reloc_on_exc(void)
 365 {
 366         long rc;
 367         unsigned int delay, total_delay = 0;
 368
 369         while (1) {
 370                 rc = enable_reloc_on_exceptions();
 371                 if (!H_IS_LONG_BUSY(rc)) {
 372                         if (rc == H_P2) {
 373                                 pr_info("Relocation on exceptions not"
 374                                         " supported\n");
 375                                 return false;
 376                         } else if (rc != H_SUCCESS) {
 377                                 pr_warn("Unable to enable relocation"
 378                                         " on exceptions: %ld\n", rc);
 379                                 return false;
 380                         }
 381                         return true;
 382                 }
 383
 384                 delay = get_longbusy_msecs(rc);
 385                 total_delay += delay;
 386                 if (total_delay > 1000) {
 387                         pr_warn("Warning: Giving up waiting to enable "
 388                                 "relocation on exceptions (%u msec)!\n",
 389                                 total_delay);
 390                         return false;
 391                 }
 392
 393                 mdelay(delay);
 394         }
 395 }
 396 EXPORT_SYMBOL(pseries_enable_reloc_on_exc);
 397
 398 void pseries_disable_reloc_on_exc(void)
 399 {
 400         long rc;
 401
 402         while (1) {
 403                 rc = disable_reloc_on_exceptions();
 404                 if (!H_IS_LONG_BUSY(rc))
 405                         break;
 406                 mdelay(get_longbusy_msecs(rc));
 407         }
 408         if (rc != H_SUCCESS)
 409                 pr_warn("Warning: Failed to disable relocation on exceptions: %ld\n",
 410                         rc);
 411 }
 412 EXPORT_SYMBOL(pseries_disable_reloc_on_exc);
 413
 414 #ifdef CONFIG_KEXEC_CORE
 415 static void pSeries_machine_kexec(struct kimage *image)
 416 {
 417         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 418                 pseries_disable_reloc_on_exc();
 419
 420         default_machine_kexec(image);
 421 }
 422 #endif
 423
 424 #ifdef __LITTLE_ENDIAN__
 425 void pseries_big_endian_exceptions(void)
 426 {
 427         long rc;
 428
 429         while (1) {
 430                 rc = enable_big_endian_exceptions();
 431                 if (!H_IS_LONG_BUSY(rc))
 432                         break;
 433                 mdelay(get_longbusy_msecs(rc));
 434         }
 435
 436         /*
 437          * At this point it is unlikely panic() will get anything
 438          * out to the user, since this is called very late in kexec
 439          * but at least this will stop us from continuing on further
 440          * and creating an even more difficult to debug situation.
 441          *
 442          * There is a known problem when kdump'ing, if cpus are offline
 443          * the above call will fail. Rather than panicking again, keep
 444          * going and hope the kdump kernel is also little endian, which
 445          * it usually is.
 446          */
 447         if (rc && !kdump_in_progress())
 448                 panic("Could not enable big endian exceptions");
 449 }
 450
 451 void pseries_little_endian_exceptions(void)
 452 {
 453         long rc;
 454
 455         while (1) {
 456                 rc = enable_little_endian_exceptions();
 457                 if (!H_IS_LONG_BUSY(rc))
 458                         break;
 459                 mdelay(get_longbusy_msecs(rc));
 460         }
 461         if (rc) {
 462                 ppc_md.progress("H_SET_MODE LE exception fail", 0);
 463                 panic("Could not enable little endian exceptions");
 464         }
 465 }
 466 #endif
 467
 468 static void __init pSeries_discover_phbs(void)
 469 {
 470         struct device_node *node;
 471         struct pci_controller *phb;
 472         struct device_node *root = of_find_node_by_path("/");
 473
 474         for_each_child_of_node(root, node) {
 475                 if (!of_node_is_type(node, "pci") &&
 476                     !of_node_is_type(node, "pciex"))
 477                         continue;
 478
 479                 phb = pcibios_alloc_controller(node);
 480                 if (!phb)
 481                         continue;
 482                 rtas_setup_phb(phb);
 483                 pci_process_bridge_OF_ranges(phb, node, 0);
 484                 isa_bridge_find_early(phb);
 485                 phb->controller_ops = pseries_pci_controller_ops;
 486
 487                 /* create pci_dn's for DT nodes under this PHB */
 488                 pci_devs_phb_init_dynamic(phb);
 489         }
 490
 491         of_node_put(root);
 492
 493         /*
 494          * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
 495          * in chosen.
 496          */
 497         of_pci_check_probe_only();
 498 }
 499
 500 static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)
 501 {
 502         /*
 503          * The features below are disabled by default, so we instead look to see
 504          * if firmware has *enabled* them, and set them if so.
 505          */
 506         if (result->character & H_CPU_CHAR_SPEC_BAR_ORI31)
 507                 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
 508
 509         if (result->character & H_CPU_CHAR_BCCTRL_SERIALISED)
 510                 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
 511
 512         if (result->character & H_CPU_CHAR_L1D_FLUSH_ORI30)
 513                 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
 514
 515         if (result->character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
 516                 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
 517
 518         if (result->character & H_CPU_CHAR_L1D_THREAD_PRIV)
 519                 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
 520
 521         if (result->character & H_CPU_CHAR_COUNT_CACHE_DISABLED)
 522                 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
 523
 524         if (result->character & H_CPU_CHAR_BCCTR_FLUSH_ASSIST)
 525                 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
 526
 527         if (result->character & H_CPU_CHAR_BCCTR_LINK_FLUSH_ASSIST)
 528                 security_ftr_set(SEC_FTR_BCCTR_LINK_FLUSH_ASSIST);
 529
 530         if (result->behaviour & H_CPU_BEHAV_FLUSH_COUNT_CACHE)
 531                 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
 532
 533         if (result->behaviour & H_CPU_BEHAV_FLUSH_LINK_STACK)
 534                 security_ftr_set(SEC_FTR_FLUSH_LINK_STACK);
 535
 536         /*
 537          * The features below are enabled by default, so we instead look to see
 538          * if firmware has *disabled* them, and clear them if so.
 539          * H_CPU_BEHAV_FAVOUR_SECURITY_H could be set only if
 540          * H_CPU_BEHAV_FAVOUR_SECURITY is.
 541          */
 542         if (!(result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY))
 543                 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
 544         else if (result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY_H)
 545                 pseries_security_flavor = 1;
 546         else
 547                 pseries_security_flavor = 2;
 548
 549         if (!(result->behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
 550                 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
 551
 552         if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY)
 553                 security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
 554
 555         if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS)
 556                 security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
 557
 558         if (result->behaviour & H_CPU_BEHAV_NO_STF_BARRIER)
 559                 security_ftr_clear(SEC_FTR_STF_BARRIER);
 560
 561         if (!(result->behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))
 562                 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
 563 }
 564
 565 void pseries_setup_security_mitigations(void)
 566 {
 567         struct h_cpu_char_result result;
 568         enum l1d_flush_type types;
 569         bool enable;
 570         long rc;
 571
 572         /*
 573          * Set features to the defaults assumed by init_cpu_char_feature_flags()
 574          * so it can set/clear again any features that might have changed after
 575          * migration, and in case the hypercall fails and it is not even called.
 576          */
 577         powerpc_security_features = SEC_FTR_DEFAULT;
 578
 579         rc = plpar_get_cpu_characteristics(&result);
 580         if (rc == H_SUCCESS)
 581                 init_cpu_char_feature_flags(&result);
 582
 583         /*
 584          * We're the guest so this doesn't apply to us, clear it to simplify
 585          * handling of it elsewhere.
 586          */
 587         security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
 588
 589         types = L1D_FLUSH_FALLBACK;
 590
 591         if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
 592                 types |= L1D_FLUSH_MTTRIG;
 593
 594         if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
 595                 types |= L1D_FLUSH_ORI;
 596
 597         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
 598                  security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR);
 599
 600         setup_rfi_flush(types, enable);
 601         setup_count_cache_flush();
 602
 603         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
 604                  security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
 605         setup_entry_flush(enable);
 606
 607         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
 608                  security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
 609         setup_uaccess_flush(enable);
 610
 611         setup_stf_barrier();
 612 }
 613
 614 #ifdef CONFIG_PCI_IOV
 615 enum rtas_iov_fw_value_map {
 616         NUM_RES_PROPERTY  = 0, /* Number of Resources */
 617         LOW_INT           = 1, /* Lowest 32 bits of Address */
 618         START_OF_ENTRIES  = 2, /* Always start of entry */
 619         APERTURE_PROPERTY = 2, /* Start of entry+ to  Aperture Size */
 620         WDW_SIZE_PROPERTY = 4, /* Start of entry+ to Window Size */
 621         NEXT_ENTRY        = 7  /* Go to next entry on array */
 622 };
 623
 624 enum get_iov_fw_value_index {
 625         BAR_ADDRS     = 1,    /*  Get Bar Address */
 626         APERTURE_SIZE = 2,    /*  Get Aperture Size */
 627         WDW_SIZE      = 3     /*  Get Window Size */
 628 };
 629
 630 static resource_size_t pseries_get_iov_fw_value(struct pci_dev *dev, int resno,
 631                                                 enum get_iov_fw_value_index value)
 632 {
 633         const int *indexes;
 634         struct device_node *dn = pci_device_to_OF_node(dev);
 635         int i, num_res, ret = 0;
 636
 637         indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
 638         if (!indexes)
 639                 return  0;
 640
 641         /*
 642          * First element in the array is the number of Bars
 643          * returned.  Search through the list to find the matching
 644          * bar
 645          */
 646         num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
 647         if (resno >= num_res)
 648                 return 0; /* or an errror */
 649
 650         i = START_OF_ENTRIES + NEXT_ENTRY * resno;
 651         switch (value) {
 652         case BAR_ADDRS:
 653                 ret = of_read_number(&indexes[i], 2);
 654                 break;
 655         case APERTURE_SIZE:
 656                 ret = of_read_number(&indexes[i + APERTURE_PROPERTY], 2);
 657                 break;
 658         case WDW_SIZE:
 659                 ret = of_read_number(&indexes[i + WDW_SIZE_PROPERTY], 2);
 660                 break;
 661         }
 662
 663         return ret;
 664 }
 665
 666 static void of_pci_set_vf_bar_size(struct pci_dev *dev, const int *indexes)
 667 {
 668         struct resource *res;
 669         resource_size_t base, size;
 670         int i, r, num_res;
 671
 672         num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
 673         num_res = min_t(int, num_res, PCI_SRIOV_NUM_BARS);
 674         for (i = START_OF_ENTRIES, r = 0; r < num_res && r < PCI_SRIOV_NUM_BARS;
 675              i += NEXT_ENTRY, r++) {
 676                 res = &dev->resource[r + PCI_IOV_RESOURCES];
 677                 base = of_read_number(&indexes[i], 2);
 678                 size = of_read_number(&indexes[i + APERTURE_PROPERTY], 2);
 679                 res->flags = pci_parse_of_flags(of_read_number
 680                                                 (&indexes[i + LOW_INT], 1), 0);
 681                 res->flags |= (IORESOURCE_MEM_64 | IORESOURCE_PCI_FIXED);
 682                 res->name = pci_name(dev);
 683                 res->start = base;
 684                 res->end = base + size - 1;
 685         }
 686 }
 687
 688 static void of_pci_parse_iov_addrs(struct pci_dev *dev, const int *indexes)
 689 {
 690         struct resource *res, *root, *conflict;
 691         resource_size_t base, size;
 692         int i, r, num_res;
 693
 694         /*
 695          * First element in the array is the number of Bars
 696          * returned.  Search through the list to find the matching
 697          * bars assign them from firmware into resources structure.
 698          */
 699         num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
 700         for (i = START_OF_ENTRIES, r = 0; r < num_res && r < PCI_SRIOV_NUM_BARS;
 701              i += NEXT_ENTRY, r++) {
 702                 res = &dev->resource[r + PCI_IOV_RESOURCES];
 703                 base = of_read_number(&indexes[i], 2);
 704                 size = of_read_number(&indexes[i + WDW_SIZE_PROPERTY], 2);
 705                 res->name = pci_name(dev);
 706                 res->start = base;
 707                 res->end = base + size - 1;
 708                 root = &iomem_resource;
 709                 dev_dbg(&dev->dev,
 710                         "pSeries IOV BAR %d: trying firmware assignment %pR\n",
 711                          r + PCI_IOV_RESOURCES, res);
 712                 conflict = request_resource_conflict(root, res);
 713                 if (conflict) {
 714                         dev_info(&dev->dev,
 715                                  "BAR %d: %pR conflicts with %s %pR\n",
 716                                  r + PCI_IOV_RESOURCES, res,
 717                                  conflict->name, conflict);
 718                         res->flags |= IORESOURCE_UNSET;
 719                 }
 720         }
 721 }
 722
 723 static void pseries_disable_sriov_resources(struct pci_dev *pdev)
 724 {
 725         int i;
 726
 727         pci_warn(pdev, "No hypervisor support for SR-IOV on this device, IOV BARs disabled.\n");
 728         for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
 729                 pdev->resource[i + PCI_IOV_RESOURCES].flags = 0;
 730 }
 731
 732 static void pseries_pci_fixup_resources(struct pci_dev *pdev)
 733 {
 734         const int *indexes;
 735         struct device_node *dn = pci_device_to_OF_node(pdev);
 736
 737         /*Firmware must support open sriov otherwise dont configure*/
 738         indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
 739         if (indexes)
 740                 of_pci_set_vf_bar_size(pdev, indexes);
 741         else
 742                 pseries_disable_sriov_resources(pdev);
 743 }
 744
 745 static void pseries_pci_fixup_iov_resources(struct pci_dev *pdev)
 746 {
 747         const int *indexes;
 748         struct device_node *dn = pci_device_to_OF_node(pdev);
 749
 750         if (!pdev->is_physfn || pci_dev_is_added(pdev))
 751                 return;
 752         /*Firmware must support open sriov otherwise dont configure*/
 753         indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
 754         if (indexes)
 755                 of_pci_parse_iov_addrs(pdev, indexes);
 756         else
 757                 pseries_disable_sriov_resources(pdev);
 758 }
 759
 760 static resource_size_t pseries_pci_iov_resource_alignment(struct pci_dev *pdev,
 761                                                           int resno)
 762 {
 763         const __be32 *reg;
 764         struct device_node *dn = pci_device_to_OF_node(pdev);
 765
 766         /*Firmware must support open sriov otherwise report regular alignment*/
 767         reg = of_get_property(dn, "ibm,is-open-sriov-pf", NULL);
 768         if (!reg)
 769                 return pci_iov_resource_size(pdev, resno);
 770
 771         if (!pdev->is_physfn)
 772                 return 0;
 773         return pseries_get_iov_fw_value(pdev,
 774                                         resno - PCI_IOV_RESOURCES,
 775                                         APERTURE_SIZE);
 776 }
 777 #endif
 778
 779 static void __init pSeries_setup_arch(void)
 780 {
 781         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
 782
 783         /* Discover PIC type and setup ppc_md accordingly */
 784         smp_init_pseries();
 785
 786
 787         if (radix_enabled() && !mmu_has_feature(MMU_FTR_GTSE))
 788                 if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
 789                         panic("BUG: Radix support requires either GTSE or RPT_INVALIDATE\n");
 790
 791
 792         /* openpic global configuration register (64-bit format). */
 793         /* openpic Interrupt Source Unit pointer (64-bit format). */
 794         /* python0 facility area (mmio) (64-bit format) REAL address. */
 795
 796         /* init to some ~sane value until calibrate_delay() runs */
 797         loops_per_jiffy = 50000000;
 798
 799         fwnmi_init();
 800
 801         pseries_setup_security_mitigations();
 802         pseries_lpar_read_hblkrm_characteristics();
 803
 804         /* By default, only probe PCI (can be overridden by rtas_pci) */
 805         pci_add_flags(PCI_PROBE_ONLY);
 806
 807         /* Find and initialize PCI host bridges */
 808         init_pci_config_tokens();
 809         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 810
 811         pSeries_nvram_init();
 812
 813         if (firmware_has_feature(FW_FEATURE_LPAR)) {
 814                 vpa_init(boot_cpuid);
 815
 816                 if (lppaca_shared_proc(get_lppaca())) {
 817                         static_branch_enable(&shared_processor);
 818                         pv_spinlocks_init();
 819                 }
 820
 821                 ppc_md.power_save = pseries_lpar_idle;
 822                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 823 #ifdef CONFIG_PCI_IOV
 824                 ppc_md.pcibios_fixup_resources =
 825                         pseries_pci_fixup_resources;
 826                 ppc_md.pcibios_fixup_sriov =
 827                         pseries_pci_fixup_iov_resources;
 828                 ppc_md.pcibios_iov_resource_alignment =
 829                         pseries_pci_iov_resource_alignment;
 830 #endif
 831         } else {
 832                 /* No special idle routine */
 833                 ppc_md.enable_pmcs = power4_enable_pmcs;
 834         }
 835
 836         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
 837
 838         if (swiotlb_force == SWIOTLB_FORCE)
 839                 ppc_swiotlb_enable = 1;
 840 }
 841
 842 static void pseries_panic(char *str)
 843 {
 844         panic_flush_kmsg_end();
 845         rtas_os_term(str);
 846 }
 847
 848 static int __init pSeries_init_panel(void)
 849 {
 850         /* Manually leave the kernel version on the panel. */
 851 #ifdef __BIG_ENDIAN__
 852         ppc_md.progress("Linux ppc64\n", 0);
 853 #else
 854         ppc_md.progress("Linux ppc64le\n", 0);
 855 #endif
 856         ppc_md.progress(init_utsname()->version, 0);
 857
 858         return 0;
 859 }
 860 machine_arch_initcall(pseries, pSeries_init_panel);
 861
 862 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 863 {
 864         return plpar_hcall_norets(H_SET_DABR, dabr);
 865 }
 866
 867 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 868 {
 869         /* Have to set at least one bit in the DABRX according to PAPR */
 870         if (dabrx == 0 && dabr == 0)
 871                 dabrx = DABRX_USER;
 872         /* PAPR says we can only set kernel and user bits */
 873         dabrx &= DABRX_KERNEL | DABRX_USER;
 874
 875         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 876 }
 877
 878 static int pseries_set_dawr(int nr, unsigned long dawr, unsigned long dawrx)
 879 {
 880         /* PAPR says we can't set HYP */
 881         dawrx &= ~DAWRX_HYP;
 882
 883         if (nr == 0)
 884                 return plpar_set_watchpoint0(dawr, dawrx);
 885         else
 886                 return plpar_set_watchpoint1(dawr, dawrx);
 887 }
 888
 889 #define CMO_CHARACTERISTICS_TOKEN 44
 890 #define CMO_MAXLENGTH 1026
 891
 892 void pSeries_coalesce_init(void)
 893 {
 894         struct hvcall_mpp_x_data mpp_x_data;
 895
 896         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 897                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 898         else
 899                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 900 }
 901
 902 /**
 903  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 904  * handle that here. (Stolen from parse_system_parameter_string)
 905  */
 906 static void pSeries_cmo_feature_init(void)
 907 {
 908         char *ptr, *key, *value, *end;
 909         int call_status;
 910         int page_order = IOMMU_PAGE_SHIFT_4K;
 911
 912         pr_debug(" -> fw_cmo_feature_init()\n");
 913         spin_lock(&rtas_data_buf_lock);
 914         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 915         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 916                                 NULL,
 917                                 CMO_CHARACTERISTICS_TOKEN,
 918                                 __pa(rtas_data_buf),
 919                                 RTAS_DATA_BUF_SIZE);
 920
 921         if (call_status != 0) {
 922                 spin_unlock(&rtas_data_buf_lock);
 923                 pr_debug("CMO not available\n");
 924                 pr_debug(" <- fw_cmo_feature_init()\n");
 925                 return;
 926         }
 927
 928         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 929         ptr = rtas_data_buf + 2;        /* step over strlen value */
 930         key = value = ptr;
 931
 932         while (*ptr && (ptr <= end)) {
 933                 /* Separate the key and value by replacing '=' with '\0' and
 934                  * point the value at the string after the '='
 935                  */
 936                 if (ptr[0] == '=') {
 937                         ptr[0] = '\0';
 938                         value = ptr + 1;
 939                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 940                         /* Terminate the string containing the key/value pair */
 941                         ptr[0] = '\0';
 942
 943                         if (key == value) {
 944                                 pr_debug("Malformed key/value pair\n");
 945                                 /* Never found a '=', end processing */
 946                                 break;
 947                         }
 948
 949                         if (0 == strcmp(key, "CMOPageSize"))
 950                                 page_order = simple_strtol(value, NULL, 10);
 951                         else if (0 == strcmp(key, "PrPSP"))
 952                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 953                         else if (0 == strcmp(key, "SecPSP"))
 954                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 955                         value = key = ptr + 1;
 956                 }
 957                 ptr++;
 958         }
 959
 960         /* Page size is returned as the power of 2 of the page size,
 961          * convert to the page size in bytes before returning
 962          */
 963         CMO_PageSize = 1 << page_order;
 964         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 965
 966         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 967                 pr_info("CMO enabled\n");
 968                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 969                          CMO_SecPSP);
 970                 powerpc_firmware_features |= FW_FEATURE_CMO;
 971                 pSeries_coalesce_init();
 972         } else
 973                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 974                          CMO_SecPSP);
 975         spin_unlock(&rtas_data_buf_lock);
 976         pr_debug(" <- fw_cmo_feature_init()\n");
 977 }
 978
 979 /*
 980  * Early initialization.  Relocation is on but do not reference unbolted pages
 981  */
 982 static void __init pseries_init(void)
 983 {
 984         pr_debug(" -> pseries_init()\n");
 985
 986 #ifdef CONFIG_HVC_CONSOLE
 987         if (firmware_has_feature(FW_FEATURE_LPAR))
 988                 hvc_vio_init_early();
 989 #endif
 990         if (firmware_has_feature(FW_FEATURE_XDABR))
 991                 ppc_md.set_dabr = pseries_set_xdabr;
 992         else if (firmware_has_feature(FW_FEATURE_DABR))
 993                 ppc_md.set_dabr = pseries_set_dabr;
 994
 995         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 996                 ppc_md.set_dawr = pseries_set_dawr;
 997
 998         pSeries_cmo_feature_init();
 999         iommu_init_early_pSeries();
1000
1001         pr_debug(" <- pseries_init()\n");
1002 }
1003
1004 /**
1005  * pseries_power_off - tell firmware about how to power off the system.
1006  *
1007  * This function calls either the power-off rtas token in normal cases
1008  * or the ibm,power-off-ups token (if present & requested) in case of
1009  * a power failure. If power-off token is used, power on will only be
1010  * possible with power button press. If ibm,power-off-ups token is used
1011  * it will allow auto poweron after power is restored.
1012  */
1013 static void pseries_power_off(void)
1014 {
1015         int rc;
1016         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
1017
1018         if (rtas_flash_term_hook)
1019                 rtas_flash_term_hook(SYS_POWER_OFF);
1020
1021         if (rtas_poweron_auto == 0 ||
1022                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
1023                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
1024                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
1025         } else {
1026                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
1027                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
1028         }
1029         for (;;);
1030 }
1031
1032 static int __init pSeries_probe(void)
1033 {
1034         if (!of_node_is_type(of_root, "chrp"))
1035                 return 0;
1036
1037         /* Cell blades firmware claims to be chrp while it's not. Until this
1038          * is fixed, we need to avoid those here.
1039          */
1040         if (of_machine_is_compatible("IBM,CPBW-1.0") ||
1041             of_machine_is_compatible("IBM,CBEA"))
1042                 return 0;
1043
1044         pm_power_off = pseries_power_off;
1045
1046         pr_debug("Machine is%s LPAR !\n",
1047                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
1048
1049         pseries_init();
1050
1051         return 1;
1052 }
1053
1054 static int pSeries_pci_probe_mode(struct pci_bus *bus)
1055 {
1056         if (firmware_has_feature(FW_FEATURE_LPAR))
1057                 return PCI_PROBE_DEVTREE;
1058         return PCI_PROBE_NORMAL;
1059 }
1060
1061 struct pci_controller_ops pseries_pci_controller_ops = {
1062         .probe_mode             = pSeries_pci_probe_mode,
1063 };
1064
1065 define_machine(pseries) {
1066         .name                   = "pSeries",
1067         .probe                  = pSeries_probe,
1068         .setup_arch             = pSeries_setup_arch,
1069         .init_IRQ               = pseries_init_irq,
1070         .show_cpuinfo           = pSeries_show_cpuinfo,
1071         .log_error              = pSeries_log_error,
1072         .discover_phbs          = pSeries_discover_phbs,
1073         .pcibios_fixup          = pSeries_final_fixup,
1074         .restart                = rtas_restart,
1075         .halt                   = rtas_halt,
1076         .panic                  = pseries_panic,
1077         .get_boot_time          = rtas_get_boot_time,
1078         .get_rtc_time           = rtas_get_rtc_time,
1079         .set_rtc_time           = rtas_set_rtc_time,
1080         .calibrate_decr         = generic_calibrate_decr,
1081         .progress               = rtas_progress,
1082         .system_reset_exception = pSeries_system_reset_exception,
1083         .machine_check_early    = pseries_machine_check_realmode,
1084         .machine_check_exception = pSeries_machine_check_exception,
1085 #ifdef CONFIG_KEXEC_CORE
1086         .machine_kexec          = pSeries_machine_kexec,
1087         .kexec_cpu_down         = pseries_kexec_cpu_down,
1088 #endif
1089 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
1090         .memory_block_size      = pseries_memory_block_size,
1091 #endif
1092 };