arch/powerpc/platforms/powernv/pci-ioda.c

   1 /*
   2  * Support PCI/PCIe on PowerNV platforms
   3  *
   4  * Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #undef DEBUG
  13
  14 #include <linux/kernel.h>
  15 #include <linux/pci.h>
  16 #include <linux/debugfs.h>
  17 #include <linux/delay.h>
  18 #include <linux/string.h>
  19 #include <linux/init.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/irq.h>
  22 #include <linux/io.h>
  23 #include <linux/msi.h>
  24 #include <linux/memblock.h>
  25
  26 #include <asm/sections.h>
  27 #include <asm/io.h>
  28 #include <asm/prom.h>
  29 #include <asm/pci-bridge.h>
  30 #include <asm/machdep.h>
  31 #include <asm/msi_bitmap.h>
  32 #include <asm/ppc-pci.h>
  33 #include <asm/opal.h>
  34 #include <asm/iommu.h>
  35 #include <asm/tce.h>
  36 #include <asm/xics.h>
  37 #include <asm/debug.h>
  38
  39 #include "powernv.h"
  40 #include "pci.h"
  41
  42 #define define_pe_printk_level(func, kern_level)                \
  43 static int func(const struct pnv_ioda_pe *pe, const char *fmt, ...)     \
  44 {                                                               \
  45         struct va_format vaf;                                   \
  46         va_list args;                                           \
  47         char pfix[32];                                          \
  48         int r;                                                  \
  49                                                                 \
  50         va_start(args, fmt);                                    \
  51                                                                 \
  52         vaf.fmt = fmt;                                          \
  53         vaf.va = &args;                                         \
  54                                                                 \
  55         if (pe->pdev)                                           \
  56                 strlcpy(pfix, dev_name(&pe->pdev->dev),         \
  57                         sizeof(pfix));                          \
  58         else                                                    \
  59                 sprintf(pfix, "%04x:%02x     ",                 \
  60                         pci_domain_nr(pe->pbus),                \
  61                         pe->pbus->number);                      \
  62         r = printk(kern_level "pci %s: [PE# %.3d] %pV",         \
  63                    pfix, pe->pe_number, &vaf);                  \
  64                                                                 \
  65         va_end(args);                                           \
  66                                                                 \
  67         return r;                                               \
  68 }                                                               \
  69
  70 define_pe_printk_level(pe_err, KERN_ERR);
  71 define_pe_printk_level(pe_warn, KERN_WARNING);
  72 define_pe_printk_level(pe_info, KERN_INFO);
  73
  74 /*
  75  * stdcix is only supposed to be used in hypervisor real mode as per
  76  * the architecture spec
  77  */
  78 static inline void __raw_rm_writeq(u64 val, volatile void __iomem *paddr)
  79 {
  80         __asm__ __volatile__("stdcix %0,0,%1"
  81                 : : "r" (val), "r" (paddr) : "memory");
  82 }
  83
  84 static int pnv_ioda_alloc_pe(struct pnv_phb *phb)
  85 {
  86         unsigned long pe;
  87
  88         do {
  89                 pe = find_next_zero_bit(phb->ioda.pe_alloc,
  90                                         phb->ioda.total_pe, 0);
  91                 if (pe >= phb->ioda.total_pe)
  92                         return IODA_INVALID_PE;
  93         } while(test_and_set_bit(pe, phb->ioda.pe_alloc));
  94
  95         phb->ioda.pe_array[pe].phb = phb;
  96         phb->ioda.pe_array[pe].pe_number = pe;
  97         return pe;
  98 }
  99
 100 static void pnv_ioda_free_pe(struct pnv_phb *phb, int pe)
 101 {
 102         WARN_ON(phb->ioda.pe_array[pe].pdev);
 103
 104         memset(&phb->ioda.pe_array[pe], 0, sizeof(struct pnv_ioda_pe));
 105         clear_bit(pe, phb->ioda.pe_alloc);
 106 }
 107
 108 /* Currently those 2 are only used when MSIs are enabled, this will change
 109  * but in the meantime, we need to protect them to avoid warnings
 110  */
 111 #ifdef CONFIG_PCI_MSI
 112 static struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
 113 {
 114         struct pci_controller *hose = pci_bus_to_host(dev->bus);
 115         struct pnv_phb *phb = hose->private_data;
 116         struct pci_dn *pdn = pci_get_pdn(dev);
 117
 118         if (!pdn)
 119                 return NULL;
 120         if (pdn->pe_number == IODA_INVALID_PE)
 121                 return NULL;
 122         return &phb->ioda.pe_array[pdn->pe_number];
 123 }
 124 #endif /* CONFIG_PCI_MSI */
 125
 126 static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
 127 {
 128         struct pci_dev *parent;
 129         uint8_t bcomp, dcomp, fcomp;
 130         long rc, rid_end, rid;
 131
 132         /* Bus validation ? */
 133         if (pe->pbus) {
 134                 int count;
 135
 136                 dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER;
 137                 fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER;
 138                 parent = pe->pbus->self;
 139                 if (pe->flags & PNV_IODA_PE_BUS_ALL)
 140                         count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1;
 141                 else
 142                         count = 1;
 143
 144                 switch(count) {
 145                 case  1: bcomp = OpalPciBusAll;         break;
 146                 case  2: bcomp = OpalPciBus7Bits;       break;
 147                 case  4: bcomp = OpalPciBus6Bits;       break;
 148                 case  8: bcomp = OpalPciBus5Bits;       break;
 149                 case 16: bcomp = OpalPciBus4Bits;       break;
 150                 case 32: bcomp = OpalPciBus3Bits;       break;
 151                 default:
 152                         pr_err("%s: Number of subordinate busses %d"
 153                                " unsupported\n",
 154                                pci_name(pe->pbus->self), count);
 155                         /* Do an exact match only */
 156                         bcomp = OpalPciBusAll;
 157                 }
 158                 rid_end = pe->rid + (count << 8);
 159         } else {
 160                 parent = pe->pdev->bus->self;
 161                 bcomp = OpalPciBusAll;
 162                 dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
 163                 fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
 164                 rid_end = pe->rid + 1;
 165         }
 166
 167         /*
 168          * Associate PE in PELT. We need add the PE into the
 169          * corresponding PELT-V as well. Otherwise, the error
 170          * originated from the PE might contribute to other
 171          * PEs.
 172          */
 173         rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
 174                              bcomp, dcomp, fcomp, OPAL_MAP_PE);
 175         if (rc) {
 176                 pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);
 177                 return -ENXIO;
 178         }
 179
 180         rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
 181                                 pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
 182         if (rc)
 183                 pe_warn(pe, "OPAL error %d adding self to PELTV\n", rc);
 184         opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
 185                                   OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
 186
 187         /* Add to all parents PELT-V */
 188         while (parent) {
 189                 struct pci_dn *pdn = pci_get_pdn(parent);
 190                 if (pdn && pdn->pe_number != IODA_INVALID_PE) {
 191                         rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number,
 192                                                 pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
 193                         /* XXX What to do in case of error ? */
 194                 }
 195                 parent = parent->bus->self;
 196         }
 197         /* Setup reverse map */
 198         for (rid = pe->rid; rid < rid_end; rid++)
 199                 phb->ioda.pe_rmap[rid] = pe->pe_number;
 200
 201         /* Setup one MVTs on IODA1 */
 202         if (phb->type == PNV_PHB_IODA1) {
 203                 pe->mve_number = pe->pe_number;
 204                 rc = opal_pci_set_mve(phb->opal_id, pe->mve_number,
 205                                       pe->pe_number);
 206                 if (rc) {
 207                         pe_err(pe, "OPAL error %ld setting up MVE %d\n",
 208                                rc, pe->mve_number);
 209                         pe->mve_number = -1;
 210                 } else {
 211                         rc = opal_pci_set_mve_enable(phb->opal_id,
 212                                                      pe->mve_number, OPAL_ENABLE_MVE);
 213                         if (rc) {
 214                                 pe_err(pe, "OPAL error %ld enabling MVE %d\n",
 215                                        rc, pe->mve_number);
 216                                 pe->mve_number = -1;
 217                         }
 218                 }
 219         } else if (phb->type == PNV_PHB_IODA2)
 220                 pe->mve_number = 0;
 221
 222         return 0;
 223 }
 224
 225 static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb,
 226                                        struct pnv_ioda_pe *pe)
 227 {
 228         struct pnv_ioda_pe *lpe;
 229
 230         list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) {
 231                 if (lpe->dma_weight < pe->dma_weight) {
 232                         list_add_tail(&pe->dma_link, &lpe->dma_link);
 233                         return;
 234                 }
 235         }
 236         list_add_tail(&pe->dma_link, &phb->ioda.pe_dma_list);
 237 }
 238
 239 static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
 240 {
 241         /* This is quite simplistic. The "base" weight of a device
 242          * is 10. 0 means no DMA is to be accounted for it.
 243          */
 244
 245         /* If it's a bridge, no DMA */
 246         if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
 247                 return 0;
 248
 249         /* Reduce the weight of slow USB controllers */
 250         if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
 251             dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
 252             dev->class == PCI_CLASS_SERIAL_USB_EHCI)
 253                 return 3;
 254
 255         /* Increase the weight of RAID (includes Obsidian) */
 256         if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
 257                 return 15;
 258
 259         /* Default */
 260         return 10;
 261 }
 262
 263 #if 0
 264 static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
 265 {
 266         struct pci_controller *hose = pci_bus_to_host(dev->bus);
 267         struct pnv_phb *phb = hose->private_data;
 268         struct pci_dn *pdn = pci_get_pdn(dev);
 269         struct pnv_ioda_pe *pe;
 270         int pe_num;
 271
 272         if (!pdn) {
 273                 pr_err("%s: Device tree node not associated properly\n",
 274                            pci_name(dev));
 275                 return NULL;
 276         }
 277         if (pdn->pe_number != IODA_INVALID_PE)
 278                 return NULL;
 279
 280         /* PE#0 has been pre-set */
 281         if (dev->bus->number == 0)
 282                 pe_num = 0;
 283         else
 284                 pe_num = pnv_ioda_alloc_pe(phb);
 285         if (pe_num == IODA_INVALID_PE) {
 286                 pr_warning("%s: Not enough PE# available, disabling device\n",
 287                            pci_name(dev));
 288                 return NULL;
 289         }
 290
 291         /* NOTE: We get only one ref to the pci_dev for the pdn, not for the
 292          * pointer in the PE data structure, both should be destroyed at the
 293          * same time. However, this needs to be looked at more closely again
 294          * once we actually start removing things (Hotplug, SR-IOV, ...)
 295          *
 296          * At some point we want to remove the PDN completely anyways
 297          */
 298         pe = &phb->ioda.pe_array[pe_num];
 299         pci_dev_get(dev);
 300         pdn->pcidev = dev;
 301         pdn->pe_number = pe_num;
 302         pe->pdev = dev;
 303         pe->pbus = NULL;
 304         pe->tce32_seg = -1;
 305         pe->mve_number = -1;
 306         pe->rid = dev->bus->number << 8 | pdn->devfn;
 307
 308         pe_info(pe, "Associated device to PE\n");
 309
 310         if (pnv_ioda_configure_pe(phb, pe)) {
 311                 /* XXX What do we do here ? */
 312                 if (pe_num)
 313                         pnv_ioda_free_pe(phb, pe_num);
 314                 pdn->pe_number = IODA_INVALID_PE;
 315                 pe->pdev = NULL;
 316                 pci_dev_put(dev);
 317                 return NULL;
 318         }
 319
 320         /* Assign a DMA weight to the device */
 321         pe->dma_weight = pnv_ioda_dma_weight(dev);
 322         if (pe->dma_weight != 0) {
 323                 phb->ioda.dma_weight += pe->dma_weight;
 324                 phb->ioda.dma_pe_count++;
 325         }
 326
 327         /* Link the PE */
 328         pnv_ioda_link_pe_by_weight(phb, pe);
 329
 330         return pe;
 331 }
 332 #endif /* Useful for SRIOV case */
 333
 334 static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe)
 335 {
 336         struct pci_dev *dev;
 337
 338         list_for_each_entry(dev, &bus->devices, bus_list) {
 339                 struct pci_dn *pdn = pci_get_pdn(dev);
 340
 341                 if (pdn == NULL) {
 342                         pr_warn("%s: No device node associated with device !\n",
 343                                 pci_name(dev));
 344                         continue;
 345                 }
 346                 pci_dev_get(dev);
 347                 pdn->pcidev = dev;
 348                 pdn->pe_number = pe->pe_number;
 349                 pe->dma_weight += pnv_ioda_dma_weight(dev);
 350                 if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
 351                         pnv_ioda_setup_same_PE(dev->subordinate, pe);
 352         }
 353 }
 354
 355 /*
 356  * There're 2 types of PCI bus sensitive PEs: One that is compromised of
 357  * single PCI bus. Another one that contains the primary PCI bus and its
 358  * subordinate PCI devices and buses. The second type of PE is normally
 359  * orgiriated by PCIe-to-PCI bridge or PLX switch downstream ports.
 360  */
 361 static void pnv_ioda_setup_bus_PE(struct pci_bus *bus, int all)
 362 {
 363         struct pci_controller *hose = pci_bus_to_host(bus);
 364         struct pnv_phb *phb = hose->private_data;
 365         struct pnv_ioda_pe *pe;
 366         int pe_num;
 367
 368         pe_num = pnv_ioda_alloc_pe(phb);
 369         if (pe_num == IODA_INVALID_PE) {
 370                 pr_warning("%s: Not enough PE# available for PCI bus %04x:%02x\n",
 371                         __func__, pci_domain_nr(bus), bus->number);
 372                 return;
 373         }
 374
 375         pe = &phb->ioda.pe_array[pe_num];
 376         pe->flags = (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS);
 377         pe->pbus = bus;
 378         pe->pdev = NULL;
 379         pe->tce32_seg = -1;
 380         pe->mve_number = -1;
 381         pe->rid = bus->busn_res.start << 8;
 382         pe->dma_weight = 0;
 383
 384         if (all)
 385                 pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n",
 386                         bus->busn_res.start, bus->busn_res.end, pe_num);
 387         else
 388                 pe_info(pe, "Secondary bus %d associated with PE#%d\n",
 389                         bus->busn_res.start, pe_num);
 390
 391         if (pnv_ioda_configure_pe(phb, pe)) {
 392                 /* XXX What do we do here ? */
 393                 if (pe_num)
 394                         pnv_ioda_free_pe(phb, pe_num);
 395                 pe->pbus = NULL;
 396                 return;
 397         }
 398
 399         /* Associate it with all child devices */
 400         pnv_ioda_setup_same_PE(bus, pe);
 401
 402         /* Put PE to the list */
 403         list_add_tail(&pe->list, &phb->ioda.pe_list);
 404
 405         /* Account for one DMA PE if at least one DMA capable device exist
 406          * below the bridge
 407          */
 408         if (pe->dma_weight != 0) {
 409                 phb->ioda.dma_weight += pe->dma_weight;
 410                 phb->ioda.dma_pe_count++;
 411         }
 412
 413         /* Link the PE */
 414         pnv_ioda_link_pe_by_weight(phb, pe);
 415 }
 416
 417 static void pnv_ioda_setup_PEs(struct pci_bus *bus)
 418 {
 419         struct pci_dev *dev;
 420
 421         pnv_ioda_setup_bus_PE(bus, 0);
 422
 423         list_for_each_entry(dev, &bus->devices, bus_list) {
 424                 if (dev->subordinate) {
 425                         if (pci_pcie_type(dev) == PCI_EXP_TYPE_PCI_BRIDGE)
 426                                 pnv_ioda_setup_bus_PE(dev->subordinate, 1);
 427                         else
 428                                 pnv_ioda_setup_PEs(dev->subordinate);
 429                 }
 430         }
 431 }
 432
 433 /*
 434  * Configure PEs so that the downstream PCI buses and devices
 435  * could have their associated PE#. Unfortunately, we didn't
 436  * figure out the way to identify the PLX bridge yet. So we
 437  * simply put the PCI bus and the subordinate behind the root
 438  * port to PE# here. The game rule here is expected to be changed
 439  * as soon as we can detected PLX bridge correctly.
 440  */
 441 static void pnv_pci_ioda_setup_PEs(void)
 442 {
 443         struct pci_controller *hose, *tmp;
 444
 445         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
 446                 pnv_ioda_setup_PEs(hose->bus);
 447         }
 448 }
 449
 450 static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev)
 451 {
 452         struct pci_dn *pdn = pci_get_pdn(pdev);
 453         struct pnv_ioda_pe *pe;
 454
 455         /*
 456          * The function can be called while the PE#
 457          * hasn't been assigned. Do nothing for the
 458          * case.
 459          */
 460         if (!pdn || pdn->pe_number == IODA_INVALID_PE)
 461                 return;
 462
 463         pe = &phb->ioda.pe_array[pdn->pe_number];
 464         WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
 465         set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
 466 }
 467
 468 static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
 469                                      struct pci_dev *pdev, u64 dma_mask)
 470 {
 471         struct pci_dn *pdn = pci_get_pdn(pdev);
 472         struct pnv_ioda_pe *pe;
 473         uint64_t top;
 474         bool bypass = false;
 475
 476         if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
 477                 return -ENODEV;;
 478
 479         pe = &phb->ioda.pe_array[pdn->pe_number];
 480         if (pe->tce_bypass_enabled) {
 481                 top = pe->tce_bypass_base + memblock_end_of_DRAM() - 1;
 482                 bypass = (dma_mask >= top);
 483         }
 484
 485         if (bypass) {
 486                 dev_info(&pdev->dev, "Using 64-bit DMA iommu bypass\n");
 487                 set_dma_ops(&pdev->dev, &dma_direct_ops);
 488                 set_dma_offset(&pdev->dev, pe->tce_bypass_base);
 489         } else {
 490                 dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
 491                 set_dma_ops(&pdev->dev, &dma_iommu_ops);
 492                 set_iommu_table_base(&pdev->dev, &pe->tce32_table);
 493         }
 494         *pdev->dev.dma_mask = dma_mask;
 495         return 0;
 496 }
 497
 498 static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
 499 {
 500         struct pci_dev *dev;
 501
 502         list_for_each_entry(dev, &bus->devices, bus_list) {
 503                 set_iommu_table_base_and_group(&dev->dev, &pe->tce32_table);
 504                 if (dev->subordinate)
 505                         pnv_ioda_setup_bus_dma(pe, dev->subordinate);
 506         }
 507 }
 508
 509 static void pnv_pci_ioda1_tce_invalidate(struct pnv_ioda_pe *pe,
 510                                          struct iommu_table *tbl,
 511                                          __be64 *startp, __be64 *endp, bool rm)
 512 {
 513         __be64 __iomem *invalidate = rm ?
 514                 (__be64 __iomem *)pe->tce_inval_reg_phys :
 515                 (__be64 __iomem *)tbl->it_index;
 516         unsigned long start, end, inc;
 517
 518         start = __pa(startp);
 519         end = __pa(endp);
 520
 521         /* BML uses this case for p6/p7/galaxy2: Shift addr and put in node */
 522         if (tbl->it_busno) {
 523                 start <<= 12;
 524                 end <<= 12;
 525                 inc = 128 << 12;
 526                 start |= tbl->it_busno;
 527                 end |= tbl->it_busno;
 528         } else if (tbl->it_type & TCE_PCI_SWINV_PAIR) {
 529                 /* p7ioc-style invalidation, 2 TCEs per write */
 530                 start |= (1ull << 63);
 531                 end |= (1ull << 63);
 532                 inc = 16;
 533         } else {
 534                 /* Default (older HW) */
 535                 inc = 128;
 536         }
 537
 538         end |= inc - 1; /* round up end to be different than start */
 539
 540         mb(); /* Ensure above stores are visible */
 541         while (start <= end) {
 542                 if (rm)
 543                         __raw_rm_writeq(cpu_to_be64(start), invalidate);
 544                 else
 545                         __raw_writeq(cpu_to_be64(start), invalidate);
 546                 start += inc;
 547         }
 548
 549         /*
 550          * The iommu layer will do another mb() for us on build()
 551          * and we don't care on free()
 552          */
 553 }
 554
 555 static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
 556                                          struct iommu_table *tbl,
 557                                          __be64 *startp, __be64 *endp, bool rm)
 558 {
 559         unsigned long start, end, inc;
 560         __be64 __iomem *invalidate = rm ?
 561                 (__be64 __iomem *)pe->tce_inval_reg_phys :
 562                 (__be64 __iomem *)tbl->it_index;
 563
 564         /* We'll invalidate DMA address in PE scope */
 565         start = 0x2ul << 60;
 566         start |= (pe->pe_number & 0xFF);
 567         end = start;
 568
 569         /* Figure out the start, end and step */
 570         inc = tbl->it_offset + (((u64)startp - tbl->it_base) / sizeof(u64));
 571         start |= (inc << 12);
 572         inc = tbl->it_offset + (((u64)endp - tbl->it_base) / sizeof(u64));
 573         end |= (inc << 12);
 574         inc = (0x1ul << 12);
 575         mb();
 576
 577         while (start <= end) {
 578                 if (rm)
 579                         __raw_rm_writeq(cpu_to_be64(start), invalidate);
 580                 else
 581                         __raw_writeq(cpu_to_be64(start), invalidate);
 582                 start += inc;
 583         }
 584 }
 585
 586 void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
 587                                  __be64 *startp, __be64 *endp, bool rm)
 588 {
 589         struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
 590                                               tce32_table);
 591         struct pnv_phb *phb = pe->phb;
 592
 593         if (phb->type == PNV_PHB_IODA1)
 594                 pnv_pci_ioda1_tce_invalidate(pe, tbl, startp, endp, rm);
 595         else
 596                 pnv_pci_ioda2_tce_invalidate(pe, tbl, startp, endp, rm);
 597 }
 598
 599 static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
 600                                       struct pnv_ioda_pe *pe, unsigned int base,
 601                                       unsigned int segs)
 602 {
 603
 604         struct page *tce_mem = NULL;
 605         const __be64 *swinvp;
 606         struct iommu_table *tbl;
 607         unsigned int i;
 608         int64_t rc;
 609         void *addr;
 610
 611         /* 256M DMA window, 4K TCE pages, 8 bytes TCE */
 612 #define TCE32_TABLE_SIZE        ((0x10000000 / 0x1000) * 8)
 613
 614         /* XXX FIXME: Handle 64-bit only DMA devices */
 615         /* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */
 616         /* XXX FIXME: Allocate multi-level tables on PHB3 */
 617
 618         /* We shouldn't already have a 32-bit DMA associated */
 619         if (WARN_ON(pe->tce32_seg >= 0))
 620                 return;
 621
 622         /* Grab a 32-bit TCE table */
 623         pe->tce32_seg = base;
 624         pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
 625                 (base << 28), ((base + segs) << 28) - 1);
 626
 627         /* XXX Currently, we allocate one big contiguous table for the
 628          * TCEs. We only really need one chunk per 256M of TCE space
 629          * (ie per segment) but that's an optimization for later, it
 630          * requires some added smarts with our get/put_tce implementation
 631          */
 632         tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
 633                                    get_order(TCE32_TABLE_SIZE * segs));
 634         if (!tce_mem) {
 635                 pe_err(pe, " Failed to allocate a 32-bit TCE memory\n");
 636                 goto fail;
 637         }
 638         addr = page_address(tce_mem);
 639         memset(addr, 0, TCE32_TABLE_SIZE * segs);
 640
 641         /* Configure HW */
 642         for (i = 0; i < segs; i++) {
 643                 rc = opal_pci_map_pe_dma_window(phb->opal_id,
 644                                               pe->pe_number,
 645                                               base + i, 1,
 646                                               __pa(addr) + TCE32_TABLE_SIZE * i,
 647                                               TCE32_TABLE_SIZE, 0x1000);
 648                 if (rc) {
 649                         pe_err(pe, " Failed to configure 32-bit TCE table,"
 650                                " err %ld\n", rc);
 651                         goto fail;
 652                 }
 653         }
 654
 655         /* Setup linux iommu table */
 656         tbl = &pe->tce32_table;
 657         pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
 658                                   base << 28);
 659
 660         /* OPAL variant of P7IOC SW invalidated TCEs */
 661         swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
 662         if (swinvp) {
 663                 /* We need a couple more fields -- an address and a data
 664                  * to or.  Since the bus is only printed out on table free
 665                  * errors, and on the first pass the data will be a relative
 666                  * bus number, print that out instead.
 667                  */
 668                 tbl->it_busno = 0;
 669                 pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
 670                 tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
 671                                 8);
 672                 tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE |
 673                                TCE_PCI_SWINV_PAIR;
 674         }
 675         iommu_init_table(tbl, phb->hose->node);
 676         iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
 677
 678         if (pe->pdev)
 679                 set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
 680         else
 681                 pnv_ioda_setup_bus_dma(pe, pe->pbus);
 682
 683         return;
 684  fail:
 685         /* XXX Failure: Try to fallback to 64-bit only ? */
 686         if (pe->tce32_seg >= 0)
 687                 pe->tce32_seg = -1;
 688         if (tce_mem)
 689                 __free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
 690 }
 691
 692 static void pnv_pci_ioda2_set_bypass(struct iommu_table *tbl, bool enable)
 693 {
 694         struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
 695                                               tce32_table);
 696         uint16_t window_id = (pe->pe_number << 1 ) + 1;
 697         int64_t rc;
 698
 699         pe_info(pe, "%sabling 64-bit DMA bypass\n", enable ? "En" : "Dis");
 700         if (enable) {
 701                 phys_addr_t top = memblock_end_of_DRAM();
 702
 703                 top = roundup_pow_of_two(top);
 704                 rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
 705                                                      pe->pe_number,
 706                                                      window_id,
 707                                                      pe->tce_bypass_base,
 708                                                      top);
 709         } else {
 710                 rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
 711                                                      pe->pe_number,
 712                                                      window_id,
 713                                                      pe->tce_bypass_base,
 714                                                      0);
 715
 716                 /*
 717                  * We might want to reset the DMA ops of all devices on
 718                  * this PE. However in theory, that shouldn't be necessary
 719                  * as this is used for VFIO/KVM pass-through and the device
 720                  * hasn't yet been returned to its kernel driver
 721                  */
 722         }
 723         if (rc)
 724                 pe_err(pe, "OPAL error %lld configuring bypass window\n", rc);
 725         else
 726                 pe->tce_bypass_enabled = enable;
 727 }
 728
 729 static void pnv_pci_ioda2_setup_bypass_pe(struct pnv_phb *phb,
 730                                           struct pnv_ioda_pe *pe)
 731 {
 732         /* TVE #1 is selected by PCI address bit 59 */
 733         pe->tce_bypass_base = 1ull << 59;
 734
 735         /* Install set_bypass callback for VFIO */
 736         pe->tce32_table.set_bypass = pnv_pci_ioda2_set_bypass;
 737
 738         /* Enable bypass by default */
 739         pnv_pci_ioda2_set_bypass(&pe->tce32_table, true);
 740 }
 741
 742 static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
 743                                        struct pnv_ioda_pe *pe)
 744 {
 745         struct page *tce_mem = NULL;
 746         void *addr;
 747         const __be64 *swinvp;
 748         struct iommu_table *tbl;
 749         unsigned int tce_table_size, end;
 750         int64_t rc;
 751
 752         /* We shouldn't already have a 32-bit DMA associated */
 753         if (WARN_ON(pe->tce32_seg >= 0))
 754                 return;
 755
 756         /* The PE will reserve all possible 32-bits space */
 757         pe->tce32_seg = 0;
 758         end = (1 << ilog2(phb->ioda.m32_pci_base));
 759         tce_table_size = (end / 0x1000) * 8;
 760         pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
 761                 end);
 762
 763         /* Allocate TCE table */
 764         tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
 765                                    get_order(tce_table_size));
 766         if (!tce_mem) {
 767                 pe_err(pe, "Failed to allocate a 32-bit TCE memory\n");
 768                 goto fail;
 769         }
 770         addr = page_address(tce_mem);
 771         memset(addr, 0, tce_table_size);
 772
 773         /*
 774          * Map TCE table through TVT. The TVE index is the PE number
 775          * shifted by 1 bit for 32-bits DMA space.
 776          */
 777         rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
 778                                         pe->pe_number << 1, 1, __pa(addr),
 779                                         tce_table_size, 0x1000);
 780         if (rc) {
 781                 pe_err(pe, "Failed to configure 32-bit TCE table,"
 782                        " err %ld\n", rc);
 783                 goto fail;
 784         }
 785
 786         /* Setup linux iommu table */
 787         tbl = &pe->tce32_table;
 788         pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0);
 789
 790         /* OPAL variant of PHB3 invalidated TCEs */
 791         swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
 792         if (swinvp) {
 793                 /* We need a couple more fields -- an address and a data
 794                  * to or.  Since the bus is only printed out on table free
 795                  * errors, and on the first pass the data will be a relative
 796                  * bus number, print that out instead.
 797                  */
 798                 tbl->it_busno = 0;
 799                 pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
 800                 tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
 801                                 8);
 802                 tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
 803         }
 804         iommu_init_table(tbl, phb->hose->node);
 805         iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
 806
 807         if (pe->pdev)
 808                 set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
 809         else
 810                 pnv_ioda_setup_bus_dma(pe, pe->pbus);
 811
 812         /* Also create a bypass window */
 813         pnv_pci_ioda2_setup_bypass_pe(phb, pe);
 814         return;
 815 fail:
 816         if (pe->tce32_seg >= 0)
 817                 pe->tce32_seg = -1;
 818         if (tce_mem)
 819                 __free_pages(tce_mem, get_order(tce_table_size));
 820 }
 821
 822 static void pnv_ioda_setup_dma(struct pnv_phb *phb)
 823 {
 824         struct pci_controller *hose = phb->hose;
 825         unsigned int residual, remaining, segs, tw, base;
 826         struct pnv_ioda_pe *pe;
 827
 828         /* If we have more PE# than segments available, hand out one
 829          * per PE until we run out and let the rest fail. If not,
 830          * then we assign at least one segment per PE, plus more based
 831          * on the amount of devices under that PE
 832          */
 833         if (phb->ioda.dma_pe_count > phb->ioda.tce32_count)
 834                 residual = 0;
 835         else
 836                 residual = phb->ioda.tce32_count -
 837                         phb->ioda.dma_pe_count;
 838
 839         pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n",
 840                 hose->global_number, phb->ioda.tce32_count);
 841         pr_info("PCI: %d PE# for a total weight of %d\n",
 842                 phb->ioda.dma_pe_count, phb->ioda.dma_weight);
 843
 844         /* Walk our PE list and configure their DMA segments, hand them
 845          * out one base segment plus any residual segments based on
 846          * weight
 847          */
 848         remaining = phb->ioda.tce32_count;
 849         tw = phb->ioda.dma_weight;
 850         base = 0;
 851         list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
 852                 if (!pe->dma_weight)
 853                         continue;
 854                 if (!remaining) {
 855                         pe_warn(pe, "No DMA32 resources available\n");
 856                         continue;
 857                 }
 858                 segs = 1;
 859                 if (residual) {
 860                         segs += ((pe->dma_weight * residual)  + (tw / 2)) / tw;
 861                         if (segs > remaining)
 862                                 segs = remaining;
 863                 }
 864
 865                 /*
 866                  * For IODA2 compliant PHB3, we needn't care about the weight.
 867                  * The all available 32-bits DMA space will be assigned to
 868                  * the specific PE.
 869                  */
 870                 if (phb->type == PNV_PHB_IODA1) {
 871                         pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
 872                                 pe->dma_weight, segs);
 873                         pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
 874                 } else {
 875                         pe_info(pe, "Assign DMA32 space\n");
 876                         segs = 0;
 877                         pnv_pci_ioda2_setup_dma_pe(phb, pe);
 878                 }
 879
 880                 remaining -= segs;
 881                 base += segs;
 882         }
 883 }
 884
 885 #ifdef CONFIG_PCI_MSI
 886 static void pnv_ioda2_msi_eoi(struct irq_data *d)
 887 {
 888         unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
 889         struct irq_chip *chip = irq_data_get_irq_chip(d);
 890         struct pnv_phb *phb = container_of(chip, struct pnv_phb,
 891                                            ioda.irq_chip);
 892         int64_t rc;
 893
 894         rc = opal_pci_msi_eoi(phb->opal_id, hw_irq);
 895         WARN_ON_ONCE(rc);
 896
 897         icp_native_eoi(d);
 898 }
 899
 900 static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
 901                                   unsigned int hwirq, unsigned int virq,
 902                                   unsigned int is_64, struct msi_msg *msg)
 903 {
 904         struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
 905         struct irq_data *idata;
 906         struct irq_chip *ichip;
 907         unsigned int xive_num = hwirq - phb->msi_base;
 908         __be32 data;
 909         int rc;
 910
 911         /* No PE assigned ? bail out ... no MSI for you ! */
 912         if (pe == NULL)
 913                 return -ENXIO;
 914
 915         /* Check if we have an MVE */
 916         if (pe->mve_number < 0)
 917                 return -ENXIO;
 918
 919         /* Force 32-bit MSI on some broken devices */
 920         if (dev->no_64bit_msi)
 921                 is_64 = 0;
 922
 923         /* Assign XIVE to PE */
 924         rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
 925         if (rc) {
 926                 pr_warn("%s: OPAL error %d setting XIVE %d PE\n",
 927                         pci_name(dev), rc, xive_num);
 928                 return -EIO;
 929         }
 930
 931         if (is_64) {
 932                 __be64 addr64;
 933
 934                 rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1,
 935                                      &addr64, &data);
 936                 if (rc) {
 937                         pr_warn("%s: OPAL error %d getting 64-bit MSI data\n",
 938                                 pci_name(dev), rc);
 939                         return -EIO;
 940                 }
 941                 msg->address_hi = be64_to_cpu(addr64) >> 32;
 942                 msg->address_lo = be64_to_cpu(addr64) & 0xfffffffful;
 943         } else {
 944                 __be32 addr32;
 945
 946                 rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1,
 947                                      &addr32, &data);
 948                 if (rc) {
 949                         pr_warn("%s: OPAL error %d getting 32-bit MSI data\n",
 950                                 pci_name(dev), rc);
 951                         return -EIO;
 952                 }
 953                 msg->address_hi = 0;
 954                 msg->address_lo = be32_to_cpu(addr32);
 955         }
 956         msg->data = be32_to_cpu(data);
 957
 958         /*
 959          * Change the IRQ chip for the MSI interrupts on PHB3.
 960          * The corresponding IRQ chip should be populated for
 961          * the first time.
 962          */
 963         if (phb->type == PNV_PHB_IODA2) {
 964                 if (!phb->ioda.irq_chip_init) {
 965                         idata = irq_get_irq_data(virq);
 966                         ichip = irq_data_get_irq_chip(idata);
 967                         phb->ioda.irq_chip_init = 1;
 968                         phb->ioda.irq_chip = *ichip;
 969                         phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi;
 970                 }
 971
 972                 irq_set_chip(virq, &phb->ioda.irq_chip);
 973         }
 974
 975         pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d),"
 976                  " address=%x_%08x data=%x PE# %d\n",
 977                  pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num,
 978                  msg->address_hi, msg->address_lo, data, pe->pe_number);
 979
 980         return 0;
 981 }
 982
 983 static void pnv_pci_init_ioda_msis(struct pnv_phb *phb)
 984 {
 985         unsigned int count;
 986         const __be32 *prop = of_get_property(phb->hose->dn,
 987                                              "ibm,opal-msi-ranges", NULL);
 988         if (!prop) {
 989                 /* BML Fallback */
 990                 prop = of_get_property(phb->hose->dn, "msi-ranges", NULL);
 991         }
 992         if (!prop)
 993                 return;
 994
 995         phb->msi_base = be32_to_cpup(prop);
 996         count = be32_to_cpup(prop + 1);
 997         if (msi_bitmap_alloc(&phb->msi_bmp, count, phb->hose->dn)) {
 998                 pr_err("PCI %d: Failed to allocate MSI bitmap !\n",
 999                        phb->hose->global_number);
1000                 return;
1001         }
1002
1003         phb->msi_setup = pnv_pci_ioda_msi_setup;
1004         phb->msi32_support = 1;
1005         pr_info("  Allocated bitmap for %d MSIs (base IRQ 0x%x)\n",
1006                 count, phb->msi_base);
1007 }
1008 #else
1009 static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { }
1010 #endif /* CONFIG_PCI_MSI */
1011
1012 /*
1013  * This function is supposed to be called on basis of PE from top
1014  * to bottom style. So the the I/O or MMIO segment assigned to
1015  * parent PE could be overrided by its child PEs if necessary.
1016  */
1017 static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
1018                                   struct pnv_ioda_pe *pe)
1019 {
1020         struct pnv_phb *phb = hose->private_data;
1021         struct pci_bus_region region;
1022         struct resource *res;
1023         int i, index;
1024         int rc;
1025
1026         /*
1027          * NOTE: We only care PCI bus based PE for now. For PCI
1028          * device based PE, for example SRIOV sensitive VF should
1029          * be figured out later.
1030          */
1031         BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));
1032
1033         pci_bus_for_each_resource(pe->pbus, res, i) {
1034                 if (!res || !res->flags ||
1035                     res->start > res->end)
1036                         continue;
1037
1038                 if (res->flags & IORESOURCE_IO) {
1039                         region.start = res->start - phb->ioda.io_pci_base;
1040                         region.end   = res->end - phb->ioda.io_pci_base;
1041                         index = region.start / phb->ioda.io_segsize;
1042
1043                         while (index < phb->ioda.total_pe &&
1044                                region.start <= region.end) {
1045                                 phb->ioda.io_segmap[index] = pe->pe_number;
1046                                 rc = opal_pci_map_pe_mmio_window(phb->opal_id,
1047                                         pe->pe_number, OPAL_IO_WINDOW_TYPE, 0, index);
1048                                 if (rc != OPAL_SUCCESS) {
1049                                         pr_err("%s: OPAL error %d when mapping IO "
1050                                                "segment #%d to PE#%d\n",
1051                                                __func__, rc, index, pe->pe_number);
1052                                         break;
1053                                 }
1054
1055                                 region.start += phb->ioda.io_segsize;
1056                                 index++;
1057                         }
1058                 } else if (res->flags & IORESOURCE_MEM) {
1059                         /* WARNING: Assumes M32 is mem region 0 in PHB. We need to
1060                          * harden that algorithm when we start supporting M64
1061                          */
1062                         region.start = res->start -
1063                                        hose->mem_offset[0] -
1064                                        phb->ioda.m32_pci_base;
1065                         region.end   = res->end -
1066                                        hose->mem_offset[0] -
1067                                        phb->ioda.m32_pci_base;
1068                         index = region.start / phb->ioda.m32_segsize;
1069
1070                         while (index < phb->ioda.total_pe &&
1071                                region.start <= region.end) {
1072                                 phb->ioda.m32_segmap[index] = pe->pe_number;
1073                                 rc = opal_pci_map_pe_mmio_window(phb->opal_id,
1074                                         pe->pe_number, OPAL_M32_WINDOW_TYPE, 0, index);
1075                                 if (rc != OPAL_SUCCESS) {
1076                                         pr_err("%s: OPAL error %d when mapping M32 "
1077                                                "segment#%d to PE#%d",
1078                                                __func__, rc, index, pe->pe_number);
1079                                         break;
1080                                 }
1081
1082                                 region.start += phb->ioda.m32_segsize;
1083                                 index++;
1084                         }
1085                 }
1086         }
1087 }
1088
1089 static void pnv_pci_ioda_setup_seg(void)
1090 {
1091         struct pci_controller *tmp, *hose;
1092         struct pnv_phb *phb;
1093         struct pnv_ioda_pe *pe;
1094
1095         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
1096                 phb = hose->private_data;
1097                 list_for_each_entry(pe, &phb->ioda.pe_list, list) {
1098                         pnv_ioda_setup_pe_seg(hose, pe);
1099                 }
1100         }
1101 }
1102
1103 static void pnv_pci_ioda_setup_DMA(void)
1104 {
1105         struct pci_controller *hose, *tmp;
1106         struct pnv_phb *phb;
1107
1108         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
1109                 pnv_ioda_setup_dma(hose->private_data);
1110
1111                 /* Mark the PHB initialization done */
1112                 phb = hose->private_data;
1113                 phb->initialized = 1;
1114         }
1115 }
1116
1117 static void pnv_pci_ioda_create_dbgfs(void)
1118 {
1119 #ifdef CONFIG_DEBUG_FS
1120         struct pci_controller *hose, *tmp;
1121         struct pnv_phb *phb;
1122         char name[16];
1123
1124         list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
1125                 phb = hose->private_data;
1126
1127                 sprintf(name, "PCI%04x", hose->global_number);
1128                 phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
1129                 if (!phb->dbgfs)
1130                         pr_warning("%s: Error on creating debugfs on PHB#%x\n",
1131                                 __func__, hose->global_number);
1132         }
1133 #endif /* CONFIG_DEBUG_FS */
1134 }
1135
1136 static void pnv_pci_ioda_fixup(void)
1137 {
1138         pnv_pci_ioda_setup_PEs();
1139         pnv_pci_ioda_setup_seg();
1140         pnv_pci_ioda_setup_DMA();
1141
1142         pnv_pci_ioda_create_dbgfs();
1143
1144 #ifdef CONFIG_EEH
1145         eeh_probe_mode_set(EEH_PROBE_MODE_DEV);
1146         eeh_addr_cache_build();
1147         eeh_init();
1148 #endif
1149 }
1150
1151 /*
1152  * Returns the alignment for I/O or memory windows for P2P
1153  * bridges. That actually depends on how PEs are segmented.
1154  * For now, we return I/O or M32 segment size for PE sensitive
1155  * P2P bridges. Otherwise, the default values (4KiB for I/O,
1156  * 1MiB for memory) will be returned.
1157  *
1158  * The current PCI bus might be put into one PE, which was
1159  * create against the parent PCI bridge. For that case, we
1160  * needn't enlarge the alignment so that we can save some
1161  * resources.
1162  */
1163 static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
1164                                                 unsigned long type)
1165 {
1166         struct pci_dev *bridge;
1167         struct pci_controller *hose = pci_bus_to_host(bus);
1168         struct pnv_phb *phb = hose->private_data;
1169         int num_pci_bridges = 0;
1170
1171         bridge = bus->self;
1172         while (bridge) {
1173                 if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) {
1174                         num_pci_bridges++;
1175                         if (num_pci_bridges >= 2)
1176                                 return 1;
1177                 }
1178
1179                 bridge = bridge->bus->self;
1180         }
1181
1182         /* We need support prefetchable memory window later */
1183         if (type & IORESOURCE_MEM)
1184                 return phb->ioda.m32_segsize;
1185
1186         return phb->ioda.io_segsize;
1187 }
1188
1189 /* Prevent enabling devices for which we couldn't properly
1190  * assign a PE
1191  */
1192 static int pnv_pci_enable_device_hook(struct pci_dev *dev)
1193 {
1194         struct pci_controller *hose = pci_bus_to_host(dev->bus);
1195         struct pnv_phb *phb = hose->private_data;
1196         struct pci_dn *pdn;
1197
1198         /* The function is probably called while the PEs have
1199          * not be created yet. For example, resource reassignment
1200          * during PCI probe period. We just skip the check if
1201          * PEs isn't ready.
1202          */
1203         if (!phb->initialized)
1204                 return 0;
1205
1206         pdn = pci_get_pdn(dev);
1207         if (!pdn || pdn->pe_number == IODA_INVALID_PE)
1208                 return -EINVAL;
1209
1210         return 0;
1211 }
1212
1213 static u32 pnv_ioda_bdfn_to_pe(struct pnv_phb *phb, struct pci_bus *bus,
1214                                u32 devfn)
1215 {
1216         return phb->ioda.pe_rmap[(bus->number << 8) | devfn];
1217 }
1218
1219 static void pnv_pci_ioda_shutdown(struct pnv_phb *phb)
1220 {
1221         opal_pci_reset(phb->opal_id, OPAL_PCI_IODA_TABLE_RESET,
1222                        OPAL_ASSERT_RESET);
1223 }
1224
1225 void __init pnv_pci_init_ioda_phb(struct device_node *np,
1226                                   u64 hub_id, int ioda_type)
1227 {
1228         struct pci_controller *hose;
1229         struct pnv_phb *phb;
1230         unsigned long size, m32map_off, pemap_off, iomap_off = 0;
1231         const __be64 *prop64;
1232         const __be32 *prop32;
1233         int len;
1234         u64 phb_id;
1235         void *aux;
1236         long rc;
1237
1238         pr_info("Initializing IODA%d OPAL PHB %s\n", ioda_type, np->full_name);
1239
1240         prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
1241         if (!prop64) {
1242                 pr_err("  Missing \"ibm,opal-phbid\" property !\n");
1243                 return;
1244         }
1245         phb_id = be64_to_cpup(prop64);
1246         pr_debug("  PHB-ID  : 0x%016llx\n", phb_id);
1247
1248         phb = alloc_bootmem(sizeof(struct pnv_phb));
1249         if (!phb) {
1250                 pr_err("  Out of memory !\n");
1251                 return;
1252         }
1253
1254         /* Allocate PCI controller */
1255         memset(phb, 0, sizeof(struct pnv_phb));
1256         phb->hose = hose = pcibios_alloc_controller(np);
1257         if (!phb->hose) {
1258                 pr_err("  Can't allocate PCI controller for %s\n",
1259                        np->full_name);
1260                 free_bootmem((unsigned long)phb, sizeof(struct pnv_phb));
1261                 return;
1262         }
1263
1264         spin_lock_init(&phb->lock);
1265         prop32 = of_get_property(np, "bus-range", &len);
1266         if (prop32 && len == 8) {
1267                 hose->first_busno = be32_to_cpu(prop32[0]);
1268                 hose->last_busno = be32_to_cpu(prop32[1]);
1269         } else {
1270                 pr_warn("  Broken <bus-range> on %s\n", np->full_name);
1271                 hose->first_busno = 0;
1272                 hose->last_busno = 0xff;
1273         }
1274         hose->private_data = phb;
1275         phb->hub_id = hub_id;
1276         phb->opal_id = phb_id;
1277         phb->type = ioda_type;
1278
1279         /* Detect specific models for error handling */
1280         if (of_device_is_compatible(np, "ibm,p7ioc-pciex"))
1281                 phb->model = PNV_PHB_MODEL_P7IOC;
1282         else if (of_device_is_compatible(np, "ibm,power8-pciex"))
1283                 phb->model = PNV_PHB_MODEL_PHB3;
1284         else
1285                 phb->model = PNV_PHB_MODEL_UNKNOWN;
1286
1287         /* Parse 32-bit and IO ranges (if any) */
1288         pci_process_bridge_OF_ranges(hose, np, !hose->global_number);
1289
1290         /* Get registers */
1291         phb->regs = of_iomap(np, 0);
1292         if (phb->regs == NULL)
1293                 pr_err("  Failed to map registers !\n");
1294
1295         /* Initialize more IODA stuff */
1296         phb->ioda.total_pe = 1;
1297         prop32 = of_get_property(np, "ibm,opal-num-pes", NULL);
1298         if (prop32)
1299                 phb->ioda.total_pe = be32_to_cpup(prop32);
1300         prop32 = of_get_property(np, "ibm,opal-reserved-pe", NULL);
1301         if (prop32)
1302                 phb->ioda.reserved_pe = be32_to_cpup(prop32);
1303         phb->ioda.m32_size = resource_size(&hose->mem_resources[0]);
1304         /* FW Has already off top 64k of M32 space (MSI space) */
1305         phb->ioda.m32_size += 0x10000;
1306
1307         phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe;
1308         phb->ioda.m32_pci_base = hose->mem_resources[0].start - hose->mem_offset[0];
1309         phb->ioda.io_size = hose->pci_io_size;
1310         phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe;
1311         phb->ioda.io_pci_base = 0; /* XXX calculate this ? */
1312
1313         /* Allocate aux data & arrays. We don't have IO ports on PHB3 */
1314         size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
1315         m32map_off = size;
1316         size += phb->ioda.total_pe * sizeof(phb->ioda.m32_segmap[0]);
1317         if (phb->type == PNV_PHB_IODA1) {
1318                 iomap_off = size;
1319                 size += phb->ioda.total_pe * sizeof(phb->ioda.io_segmap[0]);
1320         }
1321         pemap_off = size;
1322         size += phb->ioda.total_pe * sizeof(struct pnv_ioda_pe);
1323         aux = alloc_bootmem(size);
1324         memset(aux, 0, size);
1325         phb->ioda.pe_alloc = aux;
1326         phb->ioda.m32_segmap = aux + m32map_off;
1327         if (phb->type == PNV_PHB_IODA1)
1328                 phb->ioda.io_segmap = aux + iomap_off;
1329         phb->ioda.pe_array = aux + pemap_off;
1330         set_bit(phb->ioda.reserved_pe, phb->ioda.pe_alloc);
1331
1332         INIT_LIST_HEAD(&phb->ioda.pe_dma_list);
1333         INIT_LIST_HEAD(&phb->ioda.pe_list);
1334
1335         /* Calculate how many 32-bit TCE segments we have */
1336         phb->ioda.tce32_count = phb->ioda.m32_pci_base >> 28;
1337
1338         /* Clear unusable m64 */
1339         hose->mem_resources[1].flags = 0;
1340         hose->mem_resources[1].start = 0;
1341         hose->mem_resources[1].end = 0;
1342         hose->mem_resources[2].flags = 0;
1343         hose->mem_resources[2].start = 0;
1344         hose->mem_resources[2].end = 0;
1345
1346 #if 0 /* We should really do that ... */
1347         rc = opal_pci_set_phb_mem_window(opal->phb_id,
1348                                          window_type,
1349                                          window_num,
1350                                          starting_real_address,
1351                                          starting_pci_address,
1352                                          segment_size);
1353 #endif
1354
1355         pr_info("  %d (%d) PE's M32: 0x%x [segment=0x%x]"
1356                 " IO: 0x%x [segment=0x%x]\n",
1357                 phb->ioda.total_pe,
1358                 phb->ioda.reserved_pe,
1359                 phb->ioda.m32_size, phb->ioda.m32_segsize,
1360                 phb->ioda.io_size, phb->ioda.io_segsize);
1361
1362         phb->hose->ops = &pnv_pci_ops;
1363 #ifdef CONFIG_EEH
1364         phb->eeh_ops = &ioda_eeh_ops;
1365 #endif
1366
1367         /* Setup RID -> PE mapping function */
1368         phb->bdfn_to_pe = pnv_ioda_bdfn_to_pe;
1369
1370         /* Setup TCEs */
1371         phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
1372         phb->dma_set_mask = pnv_pci_ioda_dma_set_mask;
1373
1374         /* Setup shutdown function for kexec */
1375         phb->shutdown = pnv_pci_ioda_shutdown;
1376
1377         /* Setup MSI support */
1378         pnv_pci_init_ioda_msis(phb);
1379
1380         /*
1381          * We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here
1382          * to let the PCI core do resource assignment. It's supposed
1383          * that the PCI core will do correct I/O and MMIO alignment
1384          * for the P2P bridge bars so that each PCI bus (excluding
1385          * the child P2P bridges) can form individual PE.
1386          */
1387         ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;
1388         ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
1389         ppc_md.pcibios_window_alignment = pnv_pci_window_alignment;
1390         pci_add_flags(PCI_REASSIGN_ALL_RSRC);
1391
1392         /* Reset IODA tables to a clean state */
1393         rc = opal_pci_reset(phb_id, OPAL_PCI_IODA_TABLE_RESET, OPAL_ASSERT_RESET);
1394         if (rc)
1395                 pr_warning("  OPAL Error %ld performing IODA table reset !\n", rc);
1396 }
1397
1398 void __init pnv_pci_init_ioda2_phb(struct device_node *np)
1399 {
1400         pnv_pci_init_ioda_phb(np, 0, PNV_PHB_IODA2);
1401 }
1402
1403 void __init pnv_pci_init_ioda_hub(struct device_node *np)
1404 {
1405         struct device_node *phbn;
1406         const __be64 *prop64;
1407         u64 hub_id;
1408
1409         pr_info("Probing IODA IO-Hub %s\n", np->full_name);
1410
1411         prop64 = of_get_property(np, "ibm,opal-hubid", NULL);
1412         if (!prop64) {
1413                 pr_err(" Missing \"ibm,opal-hubid\" property !\n");
1414                 return;
1415         }
1416         hub_id = be64_to_cpup(prop64);
1417         pr_devel(" HUB-ID : 0x%016llx\n", hub_id);
1418
1419         /* Count child PHBs */
1420         for_each_child_of_node(np, phbn) {
1421                 /* Look for IODA1 PHBs */
1422                 if (of_device_is_compatible(phbn, "ibm,ioda-phb"))
1423                         pnv_pci_init_ioda_phb(phbn, hub_id, PNV_PHB_IODA1);
1424         }
1425 }