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
  78 DEFINE_STATIC_KEY_FALSE(shared_processor);
  79 EXPORT_SYMBOL(shared_processor);
  80
  81 int CMO_PrPSP = -1;
  82 int CMO_SecPSP = -1;
  83 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K);
  84 EXPORT_SYMBOL(CMO_PageSize);
  85
  86 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
  87 int ibm_nmi_interlock_token;
  88 u32 pseries_security_flavor;
  89
  90 static void pSeries_show_cpuinfo(struct seq_file *m)
  91 {
  92         struct device_node *root;
  93         const char *model = "";
  94
  95         root = of_find_node_by_path("/");
  96         if (root)
  97                 model = of_get_property(root, "model", NULL);
  98         seq_printf(m, "machine\t\t: CHRP %s\n", model);
  99         of_node_put(root);
 100         if (radix_enabled())
 101                 seq_printf(m, "MMU\t\t: Radix\n");
 102         else
 103                 seq_printf(m, "MMU\t\t: Hash\n");
 104 }
 105
 106 /* Initialize firmware assisted non-maskable interrupts if
 107  * the firmware supports this feature.
 108  */
 109 static void __init fwnmi_init(void)
 110 {
 111         unsigned long system_reset_addr, machine_check_addr;
 112         u8 *mce_data_buf;
 113         unsigned int i;
 114         int nr_cpus = num_possible_cpus();
 115 #ifdef CONFIG_PPC_64S_HASH_MMU
 116         struct slb_entry *slb_ptr;
 117         size_t size;
 118 #endif
 119         int ibm_nmi_register_token;
 120
 121         ibm_nmi_register_token = rtas_token("ibm,nmi-register");
 122         if (ibm_nmi_register_token == RTAS_UNKNOWN_SERVICE)
 123                 return;
 124
 125         ibm_nmi_interlock_token = rtas_token("ibm,nmi-interlock");
 126         if (WARN_ON(ibm_nmi_interlock_token == RTAS_UNKNOWN_SERVICE))
 127                 return;
 128
 129         /* If the kernel's not linked at zero we point the firmware at low
 130          * addresses anyway, and use a trampoline to get to the real code. */
 131         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
 132         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
 133
 134         if (0 == rtas_call(ibm_nmi_register_token, 2, 1, NULL,
 135                            system_reset_addr, machine_check_addr))
 136                 fwnmi_active = 1;
 137
 138         /*
 139          * Allocate a chunk for per cpu buffer to hold rtas errorlog.
 140          * It will be used in real mode mce handler, hence it needs to be
 141          * below RMA.
 142          */
 143         mce_data_buf = memblock_alloc_try_nid_raw(RTAS_ERROR_LOG_MAX * nr_cpus,
 144                                         RTAS_ERROR_LOG_MAX, MEMBLOCK_LOW_LIMIT,
 145                                         ppc64_rma_size, NUMA_NO_NODE);
 146         if (!mce_data_buf)
 147                 panic("Failed to allocate %d bytes below %pa for MCE buffer\n",
 148                       RTAS_ERROR_LOG_MAX * nr_cpus, &ppc64_rma_size);
 149
 150         for_each_possible_cpu(i) {
 151                 paca_ptrs[i]->mce_data_buf = mce_data_buf +
 152                                                 (RTAS_ERROR_LOG_MAX * i);
 153         }
 154
 155 #ifdef CONFIG_PPC_64S_HASH_MMU
 156         if (!radix_enabled()) {
 157                 /* Allocate per cpu area to save old slb contents during MCE */
 158                 size = sizeof(struct slb_entry) * mmu_slb_size * nr_cpus;
 159                 slb_ptr = memblock_alloc_try_nid_raw(size,
 160                                 sizeof(struct slb_entry), MEMBLOCK_LOW_LIMIT,
 161                                 ppc64_rma_size, NUMA_NO_NODE);
 162                 if (!slb_ptr)
 163                         panic("Failed to allocate %zu bytes below %pa for slb area\n",
 164                               size, &ppc64_rma_size);
 165
 166                 for_each_possible_cpu(i)
 167                         paca_ptrs[i]->mce_faulty_slbs = slb_ptr + (mmu_slb_size * i);
 168         }
 169 #endif
 170 }
 171
 172 static void pseries_8259_cascade(struct irq_desc *desc)
 173 {
 174         struct irq_chip *chip = irq_desc_get_chip(desc);
 175         unsigned int cascade_irq = i8259_irq();
 176
 177         if (cascade_irq)
 178                 generic_handle_irq(cascade_irq);
 179
 180         chip->irq_eoi(&desc->irq_data);
 181 }
 182
 183 static void __init pseries_setup_i8259_cascade(void)
 184 {
 185         struct device_node *np, *old, *found = NULL;
 186         unsigned int cascade;
 187         const u32 *addrp;
 188         unsigned long intack = 0;
 189         int naddr;
 190
 191         for_each_node_by_type(np, "interrupt-controller") {
 192                 if (of_device_is_compatible(np, "chrp,iic")) {
 193                         found = np;
 194                         break;
 195                 }
 196         }
 197
 198         if (found == NULL) {
 199                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
 200                 return;
 201         }
 202
 203         cascade = irq_of_parse_and_map(found, 0);
 204         if (!cascade) {
 205                 printk(KERN_ERR "pic: failed to map cascade interrupt");
 206                 return;
 207         }
 208         pr_debug("pic: cascade mapped to irq %d\n", cascade);
 209
 210         for (old = of_node_get(found); old != NULL ; old = np) {
 211                 np = of_get_parent(old);
 212                 of_node_put(old);
 213                 if (np == NULL)
 214                         break;
 215                 if (!of_node_name_eq(np, "pci"))
 216                         continue;
 217                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
 218                 if (addrp == NULL)
 219                         continue;
 220                 naddr = of_n_addr_cells(np);
 221                 intack = addrp[naddr-1];
 222                 if (naddr > 1)
 223                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
 224         }
 225         if (intack)
 226                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
 227         i8259_init(found, intack);
 228         of_node_put(found);
 229         irq_set_chained_handler(cascade, pseries_8259_cascade);
 230 }
 231
 232 static void __init pseries_init_irq(void)
 233 {
 234         /* Try using a XIVE if available, otherwise use a XICS */
 235         if (!xive_spapr_init()) {
 236                 xics_init();
 237                 pseries_setup_i8259_cascade();
 238         }
 239 }
 240
 241 static void pseries_lpar_enable_pmcs(void)
 242 {
 243         unsigned long set, reset;
 244
 245         set = 1UL << 63;
 246         reset = 0;
 247         plpar_hcall_norets(H_PERFMON, set, reset);
 248 }
 249
 250 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
 251 {
 252         struct of_reconfig_data *rd = data;
 253         struct device_node *parent, *np = rd->dn;
 254         struct pci_dn *pdn;
 255         int err = NOTIFY_OK;
 256
 257         switch (action) {
 258         case OF_RECONFIG_ATTACH_NODE:
 259                 parent = of_get_parent(np);
 260                 pdn = parent ? PCI_DN(parent) : NULL;
 261                 if (pdn)
 262                         pci_add_device_node_info(pdn->phb, np);
 263
 264                 of_node_put(parent);
 265                 break;
 266         case OF_RECONFIG_DETACH_NODE:
 267                 pdn = PCI_DN(np);
 268                 if (pdn)
 269                         list_del(&pdn->list);
 270                 break;
 271         default:
 272                 err = NOTIFY_DONE;
 273                 break;
 274         }
 275         return err;
 276 }
 277
 278 static struct notifier_block pci_dn_reconfig_nb = {
 279         .notifier_call = pci_dn_reconfig_notifier,
 280 };
 281
 282 struct kmem_cache *dtl_cache;
 283
 284 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 285 /*
 286  * Allocate space for the dispatch trace log for all possible cpus
 287  * and register the buffers with the hypervisor.  This is used for
 288  * computing time stolen by the hypervisor.
 289  */
 290 static int alloc_dispatch_logs(void)
 291 {
 292         if (!firmware_has_feature(FW_FEATURE_SPLPAR))
 293                 return 0;
 294
 295         if (!dtl_cache)
 296                 return 0;
 297
 298         alloc_dtl_buffers(0);
 299
 300         /* Register the DTL for the current (boot) cpu */
 301         register_dtl_buffer(smp_processor_id());
 302
 303         return 0;
 304 }
 305 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 306 static inline int alloc_dispatch_logs(void)
 307 {
 308         return 0;
 309 }
 310 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
 311
 312 static int alloc_dispatch_log_kmem_cache(void)
 313 {
 314         void (*ctor)(void *) = get_dtl_cache_ctor();
 315
 316         dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
 317                                                 DISPATCH_LOG_BYTES, 0, ctor);
 318         if (!dtl_cache) {
 319                 pr_warn("Failed to create dispatch trace log buffer cache\n");
 320                 pr_warn("Stolen time statistics will be unreliable\n");
 321                 return 0;
 322         }
 323
 324         return alloc_dispatch_logs();
 325 }
 326 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
 327
 328 DEFINE_PER_CPU(u64, idle_spurr_cycles);
 329 DEFINE_PER_CPU(u64, idle_entry_purr_snap);
 330 DEFINE_PER_CPU(u64, idle_entry_spurr_snap);
 331 static void pseries_lpar_idle(void)
 332 {
 333         /*
 334          * Default handler to go into low thread priority and possibly
 335          * low power mode by ceding processor to hypervisor
 336          */
 337
 338         if (!prep_irq_for_idle())
 339                 return;
 340
 341         /* Indicate to hypervisor that we are idle. */
 342         pseries_idle_prolog();
 343
 344         /*
 345          * Yield the processor to the hypervisor.  We return if
 346          * an external interrupt occurs (which are driven prior
 347          * to returning here) or if a prod occurs from another
 348          * processor. When returning here, external interrupts
 349          * are enabled.
 350          */
 351         cede_processor();
 352
 353         pseries_idle_epilog();
 354 }
 355
 356 /*
 357  * Enable relocation on during exceptions. This has partition wide scope and
 358  * may take a while to complete, if it takes longer than one second we will
 359  * just give up rather than wasting any more time on this - if that turns out
 360  * to ever be a problem in practice we can move this into a kernel thread to
 361  * finish off the process later in boot.
 362  */
 363 bool pseries_enable_reloc_on_exc(void)
 364 {
 365         long rc;
 366         unsigned int delay, total_delay = 0;
 367
 368         while (1) {
 369                 rc = enable_reloc_on_exceptions();
 370                 if (!H_IS_LONG_BUSY(rc)) {
 371                         if (rc == H_P2) {
 372                                 pr_info("Relocation on exceptions not"
 373                                         " supported\n");
 374                                 return false;
 375                         } else if (rc != H_SUCCESS) {
 376                                 pr_warn("Unable to enable relocation"
 377                                         " on exceptions: %ld\n", rc);
 378                                 return false;
 379                         }
 380                         return true;
 381                 }
 382
 383                 delay = get_longbusy_msecs(rc);
 384                 total_delay += delay;
 385                 if (total_delay > 1000) {
 386                         pr_warn("Warning: Giving up waiting to enable "
 387                                 "relocation on exceptions (%u msec)!\n",
 388                                 total_delay);
 389                         return false;
 390                 }
 391
 392                 mdelay(delay);
 393         }
 394 }
 395 EXPORT_SYMBOL(pseries_enable_reloc_on_exc);
 396
 397 void pseries_disable_reloc_on_exc(void)
 398 {
 399         long rc;
 400
 401         while (1) {
 402                 rc = disable_reloc_on_exceptions();
 403                 if (!H_IS_LONG_BUSY(rc))
 404                         break;
 405                 mdelay(get_longbusy_msecs(rc));
 406         }
 407         if (rc != H_SUCCESS)
 408                 pr_warn("Warning: Failed to disable relocation on exceptions: %ld\n",
 409                         rc);
 410 }
 411 EXPORT_SYMBOL(pseries_disable_reloc_on_exc);
 412
 413 #ifdef CONFIG_KEXEC_CORE
 414 static void pSeries_machine_kexec(struct kimage *image)
 415 {
 416         if (firmware_has_feature(FW_FEATURE_SET_MODE))
 417                 pseries_disable_reloc_on_exc();
 418
 419         default_machine_kexec(image);
 420 }
 421 #endif
 422
 423 #ifdef __LITTLE_ENDIAN__
 424 void pseries_big_endian_exceptions(void)
 425 {
 426         long rc;
 427
 428         while (1) {
 429                 rc = enable_big_endian_exceptions();
 430                 if (!H_IS_LONG_BUSY(rc))
 431                         break;
 432                 mdelay(get_longbusy_msecs(rc));
 433         }
 434
 435         /*
 436          * At this point it is unlikely panic() will get anything
 437          * out to the user, since this is called very late in kexec
 438          * but at least this will stop us from continuing on further
 439          * and creating an even more difficult to debug situation.
 440          *
 441          * There is a known problem when kdump'ing, if cpus are offline
 442          * the above call will fail. Rather than panicking again, keep
 443          * going and hope the kdump kernel is also little endian, which
 444          * it usually is.
 445          */
 446         if (rc && !kdump_in_progress())
 447                 panic("Could not enable big endian exceptions");
 448 }
 449
 450 void __init pseries_little_endian_exceptions(void)
 451 {
 452         long rc;
 453
 454         while (1) {
 455                 rc = enable_little_endian_exceptions();
 456                 if (!H_IS_LONG_BUSY(rc))
 457                         break;
 458                 mdelay(get_longbusy_msecs(rc));
 459         }
 460         if (rc) {
 461                 ppc_md.progress("H_SET_MODE LE exception fail", 0);
 462                 panic("Could not enable little endian exceptions");
 463         }
 464 }
 465 #endif
 466
 467 static void __init pSeries_discover_phbs(void)
 468 {
 469         struct device_node *node;
 470         struct pci_controller *phb;
 471         struct device_node *root = of_find_node_by_path("/");
 472
 473         for_each_child_of_node(root, node) {
 474                 if (!of_node_is_type(node, "pci") &&
 475                     !of_node_is_type(node, "pciex"))
 476                         continue;
 477
 478                 phb = pcibios_alloc_controller(node);
 479                 if (!phb)
 480                         continue;
 481                 rtas_setup_phb(phb);
 482                 pci_process_bridge_OF_ranges(phb, node, 0);
 483                 isa_bridge_find_early(phb);
 484                 phb->controller_ops = pseries_pci_controller_ops;
 485
 486                 /* create pci_dn's for DT nodes under this PHB */
 487                 pci_devs_phb_init_dynamic(phb);
 488
 489                 pseries_msi_allocate_domains(phb);
 490         }
 491
 492         of_node_put(root);
 493
 494         /*
 495          * PCI_PROBE_ONLY and PCI_REASSIGN_ALL_BUS can be set via properties
 496          * in chosen.
 497          */
 498         of_pci_check_probe_only();
 499 }
 500
 501 static void init_cpu_char_feature_flags(struct h_cpu_char_result *result)
 502 {
 503         /*
 504          * The features below are disabled by default, so we instead look to see
 505          * if firmware has *enabled* them, and set them if so.
 506          */
 507         if (result->character & H_CPU_CHAR_SPEC_BAR_ORI31)
 508                 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
 509
 510         if (result->character & H_CPU_CHAR_BCCTRL_SERIALISED)
 511                 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
 512
 513         if (result->character & H_CPU_CHAR_L1D_FLUSH_ORI30)
 514                 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
 515
 516         if (result->character & H_CPU_CHAR_L1D_FLUSH_TRIG2)
 517                 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
 518
 519         if (result->character & H_CPU_CHAR_L1D_THREAD_PRIV)
 520                 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
 521
 522         if (result->character & H_CPU_CHAR_COUNT_CACHE_DISABLED)
 523                 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
 524
 525         if (result->character & H_CPU_CHAR_BCCTR_FLUSH_ASSIST)
 526                 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
 527
 528         if (result->character & H_CPU_CHAR_BCCTR_LINK_FLUSH_ASSIST)
 529                 security_ftr_set(SEC_FTR_BCCTR_LINK_FLUSH_ASSIST);
 530
 531         if (result->behaviour & H_CPU_BEHAV_FLUSH_COUNT_CACHE)
 532                 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
 533
 534         if (result->behaviour & H_CPU_BEHAV_FLUSH_LINK_STACK)
 535                 security_ftr_set(SEC_FTR_FLUSH_LINK_STACK);
 536
 537         /*
 538          * The features below are enabled by default, so we instead look to see
 539          * if firmware has *disabled* them, and clear them if so.
 540          * H_CPU_BEHAV_FAVOUR_SECURITY_H could be set only if
 541          * H_CPU_BEHAV_FAVOUR_SECURITY is.
 542          */
 543         if (!(result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY)) {
 544                 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
 545                 pseries_security_flavor = 0;
 546         } else if (result->behaviour & H_CPU_BEHAV_FAVOUR_SECURITY_H)
 547                 pseries_security_flavor = 1;
 548         else
 549                 pseries_security_flavor = 2;
 550
 551         if (!(result->behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
 552                 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
 553
 554         if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY)
 555                 security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
 556
 557         if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS)
 558                 security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
 559
 560         if (result->behaviour & H_CPU_BEHAV_NO_STF_BARRIER)
 561                 security_ftr_clear(SEC_FTR_STF_BARRIER);
 562
 563         if (!(result->behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))
 564                 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
 565 }
 566
 567 void pseries_setup_security_mitigations(void)
 568 {
 569         struct h_cpu_char_result result;
 570         enum l1d_flush_type types;
 571         bool enable;
 572         long rc;
 573
 574         /*
 575          * Set features to the defaults assumed by init_cpu_char_feature_flags()
 576          * so it can set/clear again any features that might have changed after
 577          * migration, and in case the hypercall fails and it is not even called.
 578          */
 579         powerpc_security_features = SEC_FTR_DEFAULT;
 580
 581         rc = plpar_get_cpu_characteristics(&result);
 582         if (rc == H_SUCCESS)
 583                 init_cpu_char_feature_flags(&result);
 584
 585         /*
 586          * We're the guest so this doesn't apply to us, clear it to simplify
 587          * handling of it elsewhere.
 588          */
 589         security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
 590
 591         types = L1D_FLUSH_FALLBACK;
 592
 593         if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
 594                 types |= L1D_FLUSH_MTTRIG;
 595
 596         if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
 597                 types |= L1D_FLUSH_ORI;
 598
 599         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
 600                  security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR);
 601
 602         setup_rfi_flush(types, enable);
 603         setup_count_cache_flush();
 604
 605         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
 606                  security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
 607         setup_entry_flush(enable);
 608
 609         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
 610                  security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
 611         setup_uaccess_flush(enable);
 612
 613         setup_stf_barrier();
 614 }
 615
 616 #ifdef CONFIG_PCI_IOV
 617 enum rtas_iov_fw_value_map {
 618         NUM_RES_PROPERTY  = 0, /* Number of Resources */
 619         LOW_INT           = 1, /* Lowest 32 bits of Address */
 620         START_OF_ENTRIES  = 2, /* Always start of entry */
 621         APERTURE_PROPERTY = 2, /* Start of entry+ to  Aperture Size */
 622         WDW_SIZE_PROPERTY = 4, /* Start of entry+ to Window Size */
 623         NEXT_ENTRY        = 7  /* Go to next entry on array */
 624 };
 625
 626 enum get_iov_fw_value_index {
 627         BAR_ADDRS     = 1,    /*  Get Bar Address */
 628         APERTURE_SIZE = 2,    /*  Get Aperture Size */
 629         WDW_SIZE      = 3     /*  Get Window Size */
 630 };
 631
 632 static resource_size_t pseries_get_iov_fw_value(struct pci_dev *dev, int resno,
 633                                                 enum get_iov_fw_value_index value)
 634 {
 635         const int *indexes;
 636         struct device_node *dn = pci_device_to_OF_node(dev);
 637         int i, num_res, ret = 0;
 638
 639         indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
 640         if (!indexes)
 641                 return  0;
 642
 643         /*
 644          * First element in the array is the number of Bars
 645          * returned.  Search through the list to find the matching
 646          * bar
 647          */
 648         num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
 649         if (resno >= num_res)
 650                 return 0; /* or an errror */
 651
 652         i = START_OF_ENTRIES + NEXT_ENTRY * resno;
 653         switch (value) {
 654         case BAR_ADDRS:
 655                 ret = of_read_number(&indexes[i], 2);
 656                 break;
 657         case APERTURE_SIZE:
 658                 ret = of_read_number(&indexes[i + APERTURE_PROPERTY], 2);
 659                 break;
 660         case WDW_SIZE:
 661                 ret = of_read_number(&indexes[i + WDW_SIZE_PROPERTY], 2);
 662                 break;
 663         }
 664
 665         return ret;
 666 }
 667
 668 static void of_pci_set_vf_bar_size(struct pci_dev *dev, const int *indexes)
 669 {
 670         struct resource *res;
 671         resource_size_t base, size;
 672         int i, r, num_res;
 673
 674         num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
 675         num_res = min_t(int, num_res, PCI_SRIOV_NUM_BARS);
 676         for (i = START_OF_ENTRIES, r = 0; r < num_res && r < PCI_SRIOV_NUM_BARS;
 677              i += NEXT_ENTRY, r++) {
 678                 res = &dev->resource[r + PCI_IOV_RESOURCES];
 679                 base = of_read_number(&indexes[i], 2);
 680                 size = of_read_number(&indexes[i + APERTURE_PROPERTY], 2);
 681                 res->flags = pci_parse_of_flags(of_read_number
 682                                                 (&indexes[i + LOW_INT], 1), 0);
 683                 res->flags |= (IORESOURCE_MEM_64 | IORESOURCE_PCI_FIXED);
 684                 res->name = pci_name(dev);
 685                 res->start = base;
 686                 res->end = base + size - 1;
 687         }
 688 }
 689
 690 static void of_pci_parse_iov_addrs(struct pci_dev *dev, const int *indexes)
 691 {
 692         struct resource *res, *root, *conflict;
 693         resource_size_t base, size;
 694         int i, r, num_res;
 695
 696         /*
 697          * First element in the array is the number of Bars
 698          * returned.  Search through the list to find the matching
 699          * bars assign them from firmware into resources structure.
 700          */
 701         num_res = of_read_number(&indexes[NUM_RES_PROPERTY], 1);
 702         for (i = START_OF_ENTRIES, r = 0; r < num_res && r < PCI_SRIOV_NUM_BARS;
 703              i += NEXT_ENTRY, r++) {
 704                 res = &dev->resource[r + PCI_IOV_RESOURCES];
 705                 base = of_read_number(&indexes[i], 2);
 706                 size = of_read_number(&indexes[i + WDW_SIZE_PROPERTY], 2);
 707                 res->name = pci_name(dev);
 708                 res->start = base;
 709                 res->end = base + size - 1;
 710                 root = &iomem_resource;
 711                 dev_dbg(&dev->dev,
 712                         "pSeries IOV BAR %d: trying firmware assignment %pR\n",
 713                          r + PCI_IOV_RESOURCES, res);
 714                 conflict = request_resource_conflict(root, res);
 715                 if (conflict) {
 716                         dev_info(&dev->dev,
 717                                  "BAR %d: %pR conflicts with %s %pR\n",
 718                                  r + PCI_IOV_RESOURCES, res,
 719                                  conflict->name, conflict);
 720                         res->flags |= IORESOURCE_UNSET;
 721                 }
 722         }
 723 }
 724
 725 static void pseries_disable_sriov_resources(struct pci_dev *pdev)
 726 {
 727         int i;
 728
 729         pci_warn(pdev, "No hypervisor support for SR-IOV on this device, IOV BARs disabled.\n");
 730         for (i = 0; i < PCI_SRIOV_NUM_BARS; i++)
 731                 pdev->resource[i + PCI_IOV_RESOURCES].flags = 0;
 732 }
 733
 734 static void pseries_pci_fixup_resources(struct pci_dev *pdev)
 735 {
 736         const int *indexes;
 737         struct device_node *dn = pci_device_to_OF_node(pdev);
 738
 739         /*Firmware must support open sriov otherwise dont configure*/
 740         indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
 741         if (indexes)
 742                 of_pci_set_vf_bar_size(pdev, indexes);
 743         else
 744                 pseries_disable_sriov_resources(pdev);
 745 }
 746
 747 static void pseries_pci_fixup_iov_resources(struct pci_dev *pdev)
 748 {
 749         const int *indexes;
 750         struct device_node *dn = pci_device_to_OF_node(pdev);
 751
 752         if (!pdev->is_physfn)
 753                 return;
 754         /*Firmware must support open sriov otherwise dont configure*/
 755         indexes = of_get_property(dn, "ibm,open-sriov-vf-bar-info", NULL);
 756         if (indexes)
 757                 of_pci_parse_iov_addrs(pdev, indexes);
 758         else
 759                 pseries_disable_sriov_resources(pdev);
 760 }
 761
 762 static resource_size_t pseries_pci_iov_resource_alignment(struct pci_dev *pdev,
 763                                                           int resno)
 764 {
 765         const __be32 *reg;
 766         struct device_node *dn = pci_device_to_OF_node(pdev);
 767
 768         /*Firmware must support open sriov otherwise report regular alignment*/
 769         reg = of_get_property(dn, "ibm,is-open-sriov-pf", NULL);
 770         if (!reg)
 771                 return pci_iov_resource_size(pdev, resno);
 772
 773         if (!pdev->is_physfn)
 774                 return 0;
 775         return pseries_get_iov_fw_value(pdev,
 776                                         resno - PCI_IOV_RESOURCES,
 777                                         APERTURE_SIZE);
 778 }
 779 #endif
 780
 781 static void __init pSeries_setup_arch(void)
 782 {
 783         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
 784
 785         /* Discover PIC type and setup ppc_md accordingly */
 786         smp_init_pseries();
 787
 788
 789         if (radix_enabled() && !mmu_has_feature(MMU_FTR_GTSE))
 790                 if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
 791                         panic("BUG: Radix support requires either GTSE or RPT_INVALIDATE\n");
 792
 793
 794         /* openpic global configuration register (64-bit format). */
 795         /* openpic Interrupt Source Unit pointer (64-bit format). */
 796         /* python0 facility area (mmio) (64-bit format) REAL address. */
 797
 798         /* init to some ~sane value until calibrate_delay() runs */
 799         loops_per_jiffy = 50000000;
 800
 801         fwnmi_init();
 802
 803         pseries_setup_security_mitigations();
 804 #ifdef CONFIG_PPC_64S_HASH_MMU
 805         pseries_lpar_read_hblkrm_characteristics();
 806 #endif
 807
 808         /* By default, only probe PCI (can be overridden by rtas_pci) */
 809         pci_add_flags(PCI_PROBE_ONLY);
 810
 811         /* Find and initialize PCI host bridges */
 812         init_pci_config_tokens();
 813         of_reconfig_notifier_register(&pci_dn_reconfig_nb);
 814
 815         pSeries_nvram_init();
 816
 817         if (firmware_has_feature(FW_FEATURE_LPAR)) {
 818                 vpa_init(boot_cpuid);
 819
 820                 if (lppaca_shared_proc(get_lppaca())) {
 821                         static_branch_enable(&shared_processor);
 822                         pv_spinlocks_init();
 823                 }
 824
 825                 ppc_md.power_save = pseries_lpar_idle;
 826                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
 827 #ifdef CONFIG_PCI_IOV
 828                 ppc_md.pcibios_fixup_resources =
 829                         pseries_pci_fixup_resources;
 830                 ppc_md.pcibios_fixup_sriov =
 831                         pseries_pci_fixup_iov_resources;
 832                 ppc_md.pcibios_iov_resource_alignment =
 833                         pseries_pci_iov_resource_alignment;
 834 #endif
 835         } else {
 836                 /* No special idle routine */
 837                 ppc_md.enable_pmcs = power4_enable_pmcs;
 838         }
 839
 840         ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
 841
 842         if (swiotlb_force == SWIOTLB_FORCE)
 843                 ppc_swiotlb_enable = 1;
 844 }
 845
 846 static void pseries_panic(char *str)
 847 {
 848         panic_flush_kmsg_end();
 849         rtas_os_term(str);
 850 }
 851
 852 static int __init pSeries_init_panel(void)
 853 {
 854         /* Manually leave the kernel version on the panel. */
 855 #ifdef __BIG_ENDIAN__
 856         ppc_md.progress("Linux ppc64\n", 0);
 857 #else
 858         ppc_md.progress("Linux ppc64le\n", 0);
 859 #endif
 860         ppc_md.progress(init_utsname()->version, 0);
 861
 862         return 0;
 863 }
 864 machine_arch_initcall(pseries, pSeries_init_panel);
 865
 866 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
 867 {
 868         return plpar_hcall_norets(H_SET_DABR, dabr);
 869 }
 870
 871 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
 872 {
 873         /* Have to set at least one bit in the DABRX according to PAPR */
 874         if (dabrx == 0 && dabr == 0)
 875                 dabrx = DABRX_USER;
 876         /* PAPR says we can only set kernel and user bits */
 877         dabrx &= DABRX_KERNEL | DABRX_USER;
 878
 879         return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
 880 }
 881
 882 static int pseries_set_dawr(int nr, unsigned long dawr, unsigned long dawrx)
 883 {
 884         /* PAPR says we can't set HYP */
 885         dawrx &= ~DAWRX_HYP;
 886
 887         if (nr == 0)
 888                 return plpar_set_watchpoint0(dawr, dawrx);
 889         else
 890                 return plpar_set_watchpoint1(dawr, dawrx);
 891 }
 892
 893 #define CMO_CHARACTERISTICS_TOKEN 44
 894 #define CMO_MAXLENGTH 1026
 895
 896 void pSeries_coalesce_init(void)
 897 {
 898         struct hvcall_mpp_x_data mpp_x_data;
 899
 900         if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
 901                 powerpc_firmware_features |= FW_FEATURE_XCMO;
 902         else
 903                 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
 904 }
 905
 906 /**
 907  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
 908  * handle that here. (Stolen from parse_system_parameter_string)
 909  */
 910 static void __init pSeries_cmo_feature_init(void)
 911 {
 912         char *ptr, *key, *value, *end;
 913         int call_status;
 914         int page_order = IOMMU_PAGE_SHIFT_4K;
 915
 916         pr_debug(" -> fw_cmo_feature_init()\n");
 917         spin_lock(&rtas_data_buf_lock);
 918         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
 919         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
 920                                 NULL,
 921                                 CMO_CHARACTERISTICS_TOKEN,
 922                                 __pa(rtas_data_buf),
 923                                 RTAS_DATA_BUF_SIZE);
 924
 925         if (call_status != 0) {
 926                 spin_unlock(&rtas_data_buf_lock);
 927                 pr_debug("CMO not available\n");
 928                 pr_debug(" <- fw_cmo_feature_init()\n");
 929                 return;
 930         }
 931
 932         end = rtas_data_buf + CMO_MAXLENGTH - 2;
 933         ptr = rtas_data_buf + 2;        /* step over strlen value */
 934         key = value = ptr;
 935
 936         while (*ptr && (ptr <= end)) {
 937                 /* Separate the key and value by replacing '=' with '\0' and
 938                  * point the value at the string after the '='
 939                  */
 940                 if (ptr[0] == '=') {
 941                         ptr[0] = '\0';
 942                         value = ptr + 1;
 943                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
 944                         /* Terminate the string containing the key/value pair */
 945                         ptr[0] = '\0';
 946
 947                         if (key == value) {
 948                                 pr_debug("Malformed key/value pair\n");
 949                                 /* Never found a '=', end processing */
 950                                 break;
 951                         }
 952
 953                         if (0 == strcmp(key, "CMOPageSize"))
 954                                 page_order = simple_strtol(value, NULL, 10);
 955                         else if (0 == strcmp(key, "PrPSP"))
 956                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
 957                         else if (0 == strcmp(key, "SecPSP"))
 958                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
 959                         value = key = ptr + 1;
 960                 }
 961                 ptr++;
 962         }
 963
 964         /* Page size is returned as the power of 2 of the page size,
 965          * convert to the page size in bytes before returning
 966          */
 967         CMO_PageSize = 1 << page_order;
 968         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
 969
 970         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
 971                 pr_info("CMO enabled\n");
 972                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 973                          CMO_SecPSP);
 974                 powerpc_firmware_features |= FW_FEATURE_CMO;
 975                 pSeries_coalesce_init();
 976         } else
 977                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
 978                          CMO_SecPSP);
 979         spin_unlock(&rtas_data_buf_lock);
 980         pr_debug(" <- fw_cmo_feature_init()\n");
 981 }
 982
 983 /*
 984  * Early initialization.  Relocation is on but do not reference unbolted pages
 985  */
 986 static void __init pseries_init(void)
 987 {
 988         pr_debug(" -> pseries_init()\n");
 989
 990 #ifdef CONFIG_HVC_CONSOLE
 991         if (firmware_has_feature(FW_FEATURE_LPAR))
 992                 hvc_vio_init_early();
 993 #endif
 994         if (firmware_has_feature(FW_FEATURE_XDABR))
 995                 ppc_md.set_dabr = pseries_set_xdabr;
 996         else if (firmware_has_feature(FW_FEATURE_DABR))
 997                 ppc_md.set_dabr = pseries_set_dabr;
 998
 999         if (firmware_has_feature(FW_FEATURE_SET_MODE))
1000                 ppc_md.set_dawr = pseries_set_dawr;
1001
1002         pSeries_cmo_feature_init();
1003         iommu_init_early_pSeries();
1004
1005         pr_debug(" <- pseries_init()\n");
1006 }
1007
1008 /**
1009  * pseries_power_off - tell firmware about how to power off the system.
1010  *
1011  * This function calls either the power-off rtas token in normal cases
1012  * or the ibm,power-off-ups token (if present & requested) in case of
1013  * a power failure. If power-off token is used, power on will only be
1014  * possible with power button press. If ibm,power-off-ups token is used
1015  * it will allow auto poweron after power is restored.
1016  */
1017 static void pseries_power_off(void)
1018 {
1019         int rc;
1020         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
1021
1022         if (rtas_flash_term_hook)
1023                 rtas_flash_term_hook(SYS_POWER_OFF);
1024
1025         if (rtas_poweron_auto == 0 ||
1026                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
1027                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
1028                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
1029         } else {
1030                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
1031                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
1032         }
1033         for (;;);
1034 }
1035
1036 static int __init pSeries_probe(void)
1037 {
1038         if (!of_node_is_type(of_root, "chrp"))
1039                 return 0;
1040
1041         /* Cell blades firmware claims to be chrp while it's not. Until this
1042          * is fixed, we need to avoid those here.
1043          */
1044         if (of_machine_is_compatible("IBM,CPBW-1.0") ||
1045             of_machine_is_compatible("IBM,CBEA"))
1046                 return 0;
1047
1048         pm_power_off = pseries_power_off;
1049
1050         pr_debug("Machine is%s LPAR !\n",
1051                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
1052
1053         pseries_init();
1054
1055         return 1;
1056 }
1057
1058 static int pSeries_pci_probe_mode(struct pci_bus *bus)
1059 {
1060         if (firmware_has_feature(FW_FEATURE_LPAR))
1061                 return PCI_PROBE_DEVTREE;
1062         return PCI_PROBE_NORMAL;
1063 }
1064
1065 struct pci_controller_ops pseries_pci_controller_ops = {
1066         .probe_mode             = pSeries_pci_probe_mode,
1067 };
1068
1069 define_machine(pseries) {
1070         .name                   = "pSeries",
1071         .probe                  = pSeries_probe,
1072         .setup_arch             = pSeries_setup_arch,
1073         .init_IRQ               = pseries_init_irq,
1074         .show_cpuinfo           = pSeries_show_cpuinfo,
1075         .log_error              = pSeries_log_error,
1076         .discover_phbs          = pSeries_discover_phbs,
1077         .pcibios_fixup          = pSeries_final_fixup,
1078         .restart                = rtas_restart,
1079         .halt                   = rtas_halt,
1080         .panic                  = pseries_panic,
1081         .get_boot_time          = rtas_get_boot_time,
1082         .get_rtc_time           = rtas_get_rtc_time,
1083         .set_rtc_time           = rtas_set_rtc_time,
1084         .calibrate_decr         = generic_calibrate_decr,
1085         .progress               = rtas_progress,
1086         .system_reset_exception = pSeries_system_reset_exception,
1087         .machine_check_early    = pseries_machine_check_realmode,
1088         .machine_check_exception = pSeries_machine_check_exception,
1089         .machine_check_log_err  = pSeries_machine_check_log_err,
1090 #ifdef CONFIG_KEXEC_CORE
1091         .machine_kexec          = pSeries_machine_kexec,
1092         .kexec_cpu_down         = pseries_kexec_cpu_down,
1093 #endif
1094 #ifdef CONFIG_MEMORY_HOTPLUG
1095         .memory_block_size      = pseries_memory_block_size,
1096 #endif
1097 };