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/crash_dump.h> 17 #include <linux/debugfs.h> 18 #include <linux/delay.h> 19 #include <linux/string.h> 20 #include <linux/init.h> 21 #include <linux/bootmem.h> 22 #include <linux/irq.h> 23 #include <linux/io.h> 24 #include <linux/msi.h> 25 #include <linux/memblock.h> 26 #include <linux/iommu.h> 27 #include <linux/rculist.h> 28 #include <linux/sizes.h> 29 30 #include <asm/sections.h> 31 #include <asm/io.h> 32 #include <asm/prom.h> 33 #include <asm/pci-bridge.h> 34 #include <asm/machdep.h> 35 #include <asm/msi_bitmap.h> 36 #include <asm/ppc-pci.h> 37 #include <asm/opal.h> 38 #include <asm/iommu.h> 39 #include <asm/tce.h> 40 #include <asm/xics.h> 41 #include <asm/debug.h> 42 #include <asm/firmware.h> 43 #include <asm/pnv-pci.h> 44 #include <asm/mmzone.h> 45 46 #include <misc/cxl-base.h> 47 48 #include "powernv.h" 49 #include "pci.h" 50 51 #define PNV_IODA1_M64_NUM 16 /* Number of M64 BARs */ 52 #define PNV_IODA1_M64_SEGS 8 /* Segments per M64 BAR */ 53 #define PNV_IODA1_DMA32_SEGSIZE 0x10000000 54 55 #define POWERNV_IOMMU_DEFAULT_LEVELS 1 56 #define POWERNV_IOMMU_MAX_LEVELS 5 57 58 static const char * const pnv_phb_names[] = { "IODA1", "IODA2", "NPU" }; 59 static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl); 60 61 void pe_level_printk(const struct pnv_ioda_pe *pe, const char *level, 62 const char *fmt, ...) 63 { 64 struct va_format vaf; 65 va_list args; 66 char pfix[32]; 67 68 va_start(args, fmt); 69 70 vaf.fmt = fmt; 71 vaf.va = &args; 72 73 if (pe->flags & PNV_IODA_PE_DEV) 74 strlcpy(pfix, dev_name(&pe->pdev->dev), sizeof(pfix)); 75 else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)) 76 sprintf(pfix, "%04x:%02x ", 77 pci_domain_nr(pe->pbus), pe->pbus->number); 78 #ifdef CONFIG_PCI_IOV 79 else if (pe->flags & PNV_IODA_PE_VF) 80 sprintf(pfix, "%04x:%02x:%2x.%d", 81 pci_domain_nr(pe->parent_dev->bus), 82 (pe->rid & 0xff00) >> 8, 83 PCI_SLOT(pe->rid), PCI_FUNC(pe->rid)); 84 #endif /* CONFIG_PCI_IOV*/ 85 86 printk("%spci %s: [PE# %.3d] %pV", 87 level, pfix, pe->pe_number, &vaf); 88 89 va_end(args); 90 } 91 92 static bool pnv_iommu_bypass_disabled __read_mostly; 93 94 static int __init iommu_setup(char *str) 95 { 96 if (!str) 97 return -EINVAL; 98 99 while (*str) { 100 if (!strncmp(str, "nobypass", 8)) { 101 pnv_iommu_bypass_disabled = true; 102 pr_info("PowerNV: IOMMU bypass window disabled.\n"); 103 break; 104 } 105 str += strcspn(str, ","); 106 if (*str == ',') 107 str++; 108 } 109 110 return 0; 111 } 112 early_param("iommu", iommu_setup); 113 114 static inline bool pnv_pci_is_m64(struct pnv_phb *phb, struct resource *r) 115 { 116 /* 117 * WARNING: We cannot rely on the resource flags. The Linux PCI 118 * allocation code sometimes decides to put a 64-bit prefetchable 119 * BAR in the 32-bit window, so we have to compare the addresses. 120 * 121 * For simplicity we only test resource start. 122 */ 123 return (r->start >= phb->ioda.m64_base && 124 r->start < (phb->ioda.m64_base + phb->ioda.m64_size)); 125 } 126 127 static inline bool pnv_pci_is_m64_flags(unsigned long resource_flags) 128 { 129 unsigned long flags = (IORESOURCE_MEM_64 | IORESOURCE_PREFETCH); 130 131 return (resource_flags & flags) == flags; 132 } 133 134 static struct pnv_ioda_pe *pnv_ioda_init_pe(struct pnv_phb *phb, int pe_no) 135 { 136 phb->ioda.pe_array[pe_no].phb = phb; 137 phb->ioda.pe_array[pe_no].pe_number = pe_no; 138 139 return &phb->ioda.pe_array[pe_no]; 140 } 141 142 static void pnv_ioda_reserve_pe(struct pnv_phb *phb, int pe_no) 143 { 144 if (!(pe_no >= 0 && pe_no < phb->ioda.total_pe_num)) { 145 pr_warn("%s: Invalid PE %d on PHB#%x\n", 146 __func__, pe_no, phb->hose->global_number); 147 return; 148 } 149 150 if (test_and_set_bit(pe_no, phb->ioda.pe_alloc)) 151 pr_debug("%s: PE %d was reserved on PHB#%x\n", 152 __func__, pe_no, phb->hose->global_number); 153 154 pnv_ioda_init_pe(phb, pe_no); 155 } 156 157 static struct pnv_ioda_pe *pnv_ioda_alloc_pe(struct pnv_phb *phb) 158 { 159 long pe; 160 161 for (pe = phb->ioda.total_pe_num - 1; pe >= 0; pe--) { 162 if (!test_and_set_bit(pe, phb->ioda.pe_alloc)) 163 return pnv_ioda_init_pe(phb, pe); 164 } 165 166 return NULL; 167 } 168 169 static void pnv_ioda_free_pe(struct pnv_ioda_pe *pe) 170 { 171 struct pnv_phb *phb = pe->phb; 172 unsigned int pe_num = pe->pe_number; 173 174 WARN_ON(pe->pdev); 175 176 memset(pe, 0, sizeof(struct pnv_ioda_pe)); 177 clear_bit(pe_num, phb->ioda.pe_alloc); 178 } 179 180 /* The default M64 BAR is shared by all PEs */ 181 static int pnv_ioda2_init_m64(struct pnv_phb *phb) 182 { 183 const char *desc; 184 struct resource *r; 185 s64 rc; 186 187 /* Configure the default M64 BAR */ 188 rc = opal_pci_set_phb_mem_window(phb->opal_id, 189 OPAL_M64_WINDOW_TYPE, 190 phb->ioda.m64_bar_idx, 191 phb->ioda.m64_base, 192 0, /* unused */ 193 phb->ioda.m64_size); 194 if (rc != OPAL_SUCCESS) { 195 desc = "configuring"; 196 goto fail; 197 } 198 199 /* Enable the default M64 BAR */ 200 rc = opal_pci_phb_mmio_enable(phb->opal_id, 201 OPAL_M64_WINDOW_TYPE, 202 phb->ioda.m64_bar_idx, 203 OPAL_ENABLE_M64_SPLIT); 204 if (rc != OPAL_SUCCESS) { 205 desc = "enabling"; 206 goto fail; 207 } 208 209 /* 210 * Exclude the segments for reserved and root bus PE, which 211 * are first or last two PEs. 212 */ 213 r = &phb->hose->mem_resources[1]; 214 if (phb->ioda.reserved_pe_idx == 0) 215 r->start += (2 * phb->ioda.m64_segsize); 216 else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1)) 217 r->end -= (2 * phb->ioda.m64_segsize); 218 else 219 pr_warn(" Cannot strip M64 segment for reserved PE#%d\n", 220 phb->ioda.reserved_pe_idx); 221 222 return 0; 223 224 fail: 225 pr_warn(" Failure %lld %s M64 BAR#%d\n", 226 rc, desc, phb->ioda.m64_bar_idx); 227 opal_pci_phb_mmio_enable(phb->opal_id, 228 OPAL_M64_WINDOW_TYPE, 229 phb->ioda.m64_bar_idx, 230 OPAL_DISABLE_M64); 231 return -EIO; 232 } 233 234 static void pnv_ioda_reserve_dev_m64_pe(struct pci_dev *pdev, 235 unsigned long *pe_bitmap) 236 { 237 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 238 struct pnv_phb *phb = hose->private_data; 239 struct resource *r; 240 resource_size_t base, sgsz, start, end; 241 int segno, i; 242 243 base = phb->ioda.m64_base; 244 sgsz = phb->ioda.m64_segsize; 245 for (i = 0; i <= PCI_ROM_RESOURCE; i++) { 246 r = &pdev->resource[i]; 247 if (!r->parent || !pnv_pci_is_m64(phb, r)) 248 continue; 249 250 start = _ALIGN_DOWN(r->start - base, sgsz); 251 end = _ALIGN_UP(r->end - base, sgsz); 252 for (segno = start / sgsz; segno < end / sgsz; segno++) { 253 if (pe_bitmap) 254 set_bit(segno, pe_bitmap); 255 else 256 pnv_ioda_reserve_pe(phb, segno); 257 } 258 } 259 } 260 261 static int pnv_ioda1_init_m64(struct pnv_phb *phb) 262 { 263 struct resource *r; 264 int index; 265 266 /* 267 * There are 16 M64 BARs, each of which has 8 segments. So 268 * there are as many M64 segments as the maximum number of 269 * PEs, which is 128. 270 */ 271 for (index = 0; index < PNV_IODA1_M64_NUM; index++) { 272 unsigned long base, segsz = phb->ioda.m64_segsize; 273 int64_t rc; 274 275 base = phb->ioda.m64_base + 276 index * PNV_IODA1_M64_SEGS * segsz; 277 rc = opal_pci_set_phb_mem_window(phb->opal_id, 278 OPAL_M64_WINDOW_TYPE, index, base, 0, 279 PNV_IODA1_M64_SEGS * segsz); 280 if (rc != OPAL_SUCCESS) { 281 pr_warn(" Error %lld setting M64 PHB#%d-BAR#%d\n", 282 rc, phb->hose->global_number, index); 283 goto fail; 284 } 285 286 rc = opal_pci_phb_mmio_enable(phb->opal_id, 287 OPAL_M64_WINDOW_TYPE, index, 288 OPAL_ENABLE_M64_SPLIT); 289 if (rc != OPAL_SUCCESS) { 290 pr_warn(" Error %lld enabling M64 PHB#%d-BAR#%d\n", 291 rc, phb->hose->global_number, index); 292 goto fail; 293 } 294 } 295 296 /* 297 * Exclude the segments for reserved and root bus PE, which 298 * are first or last two PEs. 299 */ 300 r = &phb->hose->mem_resources[1]; 301 if (phb->ioda.reserved_pe_idx == 0) 302 r->start += (2 * phb->ioda.m64_segsize); 303 else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1)) 304 r->end -= (2 * phb->ioda.m64_segsize); 305 else 306 WARN(1, "Wrong reserved PE#%d on PHB#%d\n", 307 phb->ioda.reserved_pe_idx, phb->hose->global_number); 308 309 return 0; 310 311 fail: 312 for ( ; index >= 0; index--) 313 opal_pci_phb_mmio_enable(phb->opal_id, 314 OPAL_M64_WINDOW_TYPE, index, OPAL_DISABLE_M64); 315 316 return -EIO; 317 } 318 319 static void pnv_ioda_reserve_m64_pe(struct pci_bus *bus, 320 unsigned long *pe_bitmap, 321 bool all) 322 { 323 struct pci_dev *pdev; 324 325 list_for_each_entry(pdev, &bus->devices, bus_list) { 326 pnv_ioda_reserve_dev_m64_pe(pdev, pe_bitmap); 327 328 if (all && pdev->subordinate) 329 pnv_ioda_reserve_m64_pe(pdev->subordinate, 330 pe_bitmap, all); 331 } 332 } 333 334 static struct pnv_ioda_pe *pnv_ioda_pick_m64_pe(struct pci_bus *bus, bool all) 335 { 336 struct pci_controller *hose = pci_bus_to_host(bus); 337 struct pnv_phb *phb = hose->private_data; 338 struct pnv_ioda_pe *master_pe, *pe; 339 unsigned long size, *pe_alloc; 340 int i; 341 342 /* Root bus shouldn't use M64 */ 343 if (pci_is_root_bus(bus)) 344 return NULL; 345 346 /* Allocate bitmap */ 347 size = _ALIGN_UP(phb->ioda.total_pe_num / 8, sizeof(unsigned long)); 348 pe_alloc = kzalloc(size, GFP_KERNEL); 349 if (!pe_alloc) { 350 pr_warn("%s: Out of memory !\n", 351 __func__); 352 return NULL; 353 } 354 355 /* Figure out reserved PE numbers by the PE */ 356 pnv_ioda_reserve_m64_pe(bus, pe_alloc, all); 357 358 /* 359 * the current bus might not own M64 window and that's all 360 * contributed by its child buses. For the case, we needn't 361 * pick M64 dependent PE#. 362 */ 363 if (bitmap_empty(pe_alloc, phb->ioda.total_pe_num)) { 364 kfree(pe_alloc); 365 return NULL; 366 } 367 368 /* 369 * Figure out the master PE and put all slave PEs to master 370 * PE's list to form compound PE. 371 */ 372 master_pe = NULL; 373 i = -1; 374 while ((i = find_next_bit(pe_alloc, phb->ioda.total_pe_num, i + 1)) < 375 phb->ioda.total_pe_num) { 376 pe = &phb->ioda.pe_array[i]; 377 378 phb->ioda.m64_segmap[pe->pe_number] = pe->pe_number; 379 if (!master_pe) { 380 pe->flags |= PNV_IODA_PE_MASTER; 381 INIT_LIST_HEAD(&pe->slaves); 382 master_pe = pe; 383 } else { 384 pe->flags |= PNV_IODA_PE_SLAVE; 385 pe->master = master_pe; 386 list_add_tail(&pe->list, &master_pe->slaves); 387 } 388 389 /* 390 * P7IOC supports M64DT, which helps mapping M64 segment 391 * to one particular PE#. However, PHB3 has fixed mapping 392 * between M64 segment and PE#. In order to have same logic 393 * for P7IOC and PHB3, we enforce fixed mapping between M64 394 * segment and PE# on P7IOC. 395 */ 396 if (phb->type == PNV_PHB_IODA1) { 397 int64_t rc; 398 399 rc = opal_pci_map_pe_mmio_window(phb->opal_id, 400 pe->pe_number, OPAL_M64_WINDOW_TYPE, 401 pe->pe_number / PNV_IODA1_M64_SEGS, 402 pe->pe_number % PNV_IODA1_M64_SEGS); 403 if (rc != OPAL_SUCCESS) 404 pr_warn("%s: Error %lld mapping M64 for PHB#%d-PE#%d\n", 405 __func__, rc, phb->hose->global_number, 406 pe->pe_number); 407 } 408 } 409 410 kfree(pe_alloc); 411 return master_pe; 412 } 413 414 static void __init pnv_ioda_parse_m64_window(struct pnv_phb *phb) 415 { 416 struct pci_controller *hose = phb->hose; 417 struct device_node *dn = hose->dn; 418 struct resource *res; 419 u32 m64_range[2], i; 420 const u32 *r; 421 u64 pci_addr; 422 423 if (phb->type != PNV_PHB_IODA1 && phb->type != PNV_PHB_IODA2) { 424 pr_info(" Not support M64 window\n"); 425 return; 426 } 427 428 if (!firmware_has_feature(FW_FEATURE_OPAL)) { 429 pr_info(" Firmware too old to support M64 window\n"); 430 return; 431 } 432 433 r = of_get_property(dn, "ibm,opal-m64-window", NULL); 434 if (!r) { 435 pr_info(" No <ibm,opal-m64-window> on %s\n", 436 dn->full_name); 437 return; 438 } 439 440 /* 441 * Find the available M64 BAR range and pickup the last one for 442 * covering the whole 64-bits space. We support only one range. 443 */ 444 if (of_property_read_u32_array(dn, "ibm,opal-available-m64-ranges", 445 m64_range, 2)) { 446 /* In absence of the property, assume 0..15 */ 447 m64_range[0] = 0; 448 m64_range[1] = 16; 449 } 450 /* We only support 64 bits in our allocator */ 451 if (m64_range[1] > 63) { 452 pr_warn("%s: Limiting M64 range to 63 (from %d) on PHB#%x\n", 453 __func__, m64_range[1], phb->hose->global_number); 454 m64_range[1] = 63; 455 } 456 /* Empty range, no m64 */ 457 if (m64_range[1] <= m64_range[0]) { 458 pr_warn("%s: M64 empty, disabling M64 usage on PHB#%x\n", 459 __func__, phb->hose->global_number); 460 return; 461 } 462 463 /* Configure M64 informations */ 464 res = &hose->mem_resources[1]; 465 res->name = dn->full_name; 466 res->start = of_translate_address(dn, r + 2); 467 res->end = res->start + of_read_number(r + 4, 2) - 1; 468 res->flags = (IORESOURCE_MEM | IORESOURCE_MEM_64 | IORESOURCE_PREFETCH); 469 pci_addr = of_read_number(r, 2); 470 hose->mem_offset[1] = res->start - pci_addr; 471 472 phb->ioda.m64_size = resource_size(res); 473 phb->ioda.m64_segsize = phb->ioda.m64_size / phb->ioda.total_pe_num; 474 phb->ioda.m64_base = pci_addr; 475 476 /* This lines up nicely with the display from processing OF ranges */ 477 pr_info(" MEM 0x%016llx..0x%016llx -> 0x%016llx (M64 #%d..%d)\n", 478 res->start, res->end, pci_addr, m64_range[0], 479 m64_range[0] + m64_range[1] - 1); 480 481 /* Mark all M64 used up by default */ 482 phb->ioda.m64_bar_alloc = (unsigned long)-1; 483 484 /* Use last M64 BAR to cover M64 window */ 485 m64_range[1]--; 486 phb->ioda.m64_bar_idx = m64_range[0] + m64_range[1]; 487 488 pr_info(" Using M64 #%d as default window\n", phb->ioda.m64_bar_idx); 489 490 /* Mark remaining ones free */ 491 for (i = m64_range[0]; i < m64_range[1]; i++) 492 clear_bit(i, &phb->ioda.m64_bar_alloc); 493 494 /* 495 * Setup init functions for M64 based on IODA version, IODA3 uses 496 * the IODA2 code. 497 */ 498 if (phb->type == PNV_PHB_IODA1) 499 phb->init_m64 = pnv_ioda1_init_m64; 500 else 501 phb->init_m64 = pnv_ioda2_init_m64; 502 phb->reserve_m64_pe = pnv_ioda_reserve_m64_pe; 503 phb->pick_m64_pe = pnv_ioda_pick_m64_pe; 504 } 505 506 static void pnv_ioda_freeze_pe(struct pnv_phb *phb, int pe_no) 507 { 508 struct pnv_ioda_pe *pe = &phb->ioda.pe_array[pe_no]; 509 struct pnv_ioda_pe *slave; 510 s64 rc; 511 512 /* Fetch master PE */ 513 if (pe->flags & PNV_IODA_PE_SLAVE) { 514 pe = pe->master; 515 if (WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER))) 516 return; 517 518 pe_no = pe->pe_number; 519 } 520 521 /* Freeze master PE */ 522 rc = opal_pci_eeh_freeze_set(phb->opal_id, 523 pe_no, 524 OPAL_EEH_ACTION_SET_FREEZE_ALL); 525 if (rc != OPAL_SUCCESS) { 526 pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n", 527 __func__, rc, phb->hose->global_number, pe_no); 528 return; 529 } 530 531 /* Freeze slave PEs */ 532 if (!(pe->flags & PNV_IODA_PE_MASTER)) 533 return; 534 535 list_for_each_entry(slave, &pe->slaves, list) { 536 rc = opal_pci_eeh_freeze_set(phb->opal_id, 537 slave->pe_number, 538 OPAL_EEH_ACTION_SET_FREEZE_ALL); 539 if (rc != OPAL_SUCCESS) 540 pr_warn("%s: Failure %lld freezing PHB#%x-PE#%x\n", 541 __func__, rc, phb->hose->global_number, 542 slave->pe_number); 543 } 544 } 545 546 static int pnv_ioda_unfreeze_pe(struct pnv_phb *phb, int pe_no, int opt) 547 { 548 struct pnv_ioda_pe *pe, *slave; 549 s64 rc; 550 551 /* Find master PE */ 552 pe = &phb->ioda.pe_array[pe_no]; 553 if (pe->flags & PNV_IODA_PE_SLAVE) { 554 pe = pe->master; 555 WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER)); 556 pe_no = pe->pe_number; 557 } 558 559 /* Clear frozen state for master PE */ 560 rc = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no, opt); 561 if (rc != OPAL_SUCCESS) { 562 pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n", 563 __func__, rc, opt, phb->hose->global_number, pe_no); 564 return -EIO; 565 } 566 567 if (!(pe->flags & PNV_IODA_PE_MASTER)) 568 return 0; 569 570 /* Clear frozen state for slave PEs */ 571 list_for_each_entry(slave, &pe->slaves, list) { 572 rc = opal_pci_eeh_freeze_clear(phb->opal_id, 573 slave->pe_number, 574 opt); 575 if (rc != OPAL_SUCCESS) { 576 pr_warn("%s: Failure %lld clear %d on PHB#%x-PE#%x\n", 577 __func__, rc, opt, phb->hose->global_number, 578 slave->pe_number); 579 return -EIO; 580 } 581 } 582 583 return 0; 584 } 585 586 static int pnv_ioda_get_pe_state(struct pnv_phb *phb, int pe_no) 587 { 588 struct pnv_ioda_pe *slave, *pe; 589 u8 fstate, state; 590 __be16 pcierr; 591 s64 rc; 592 593 /* Sanity check on PE number */ 594 if (pe_no < 0 || pe_no >= phb->ioda.total_pe_num) 595 return OPAL_EEH_STOPPED_PERM_UNAVAIL; 596 597 /* 598 * Fetch the master PE and the PE instance might be 599 * not initialized yet. 600 */ 601 pe = &phb->ioda.pe_array[pe_no]; 602 if (pe->flags & PNV_IODA_PE_SLAVE) { 603 pe = pe->master; 604 WARN_ON(!pe || !(pe->flags & PNV_IODA_PE_MASTER)); 605 pe_no = pe->pe_number; 606 } 607 608 /* Check the master PE */ 609 rc = opal_pci_eeh_freeze_status(phb->opal_id, pe_no, 610 &state, &pcierr, NULL); 611 if (rc != OPAL_SUCCESS) { 612 pr_warn("%s: Failure %lld getting " 613 "PHB#%x-PE#%x state\n", 614 __func__, rc, 615 phb->hose->global_number, pe_no); 616 return OPAL_EEH_STOPPED_TEMP_UNAVAIL; 617 } 618 619 /* Check the slave PE */ 620 if (!(pe->flags & PNV_IODA_PE_MASTER)) 621 return state; 622 623 list_for_each_entry(slave, &pe->slaves, list) { 624 rc = opal_pci_eeh_freeze_status(phb->opal_id, 625 slave->pe_number, 626 &fstate, 627 &pcierr, 628 NULL); 629 if (rc != OPAL_SUCCESS) { 630 pr_warn("%s: Failure %lld getting " 631 "PHB#%x-PE#%x state\n", 632 __func__, rc, 633 phb->hose->global_number, slave->pe_number); 634 return OPAL_EEH_STOPPED_TEMP_UNAVAIL; 635 } 636 637 /* 638 * Override the result based on the ascending 639 * priority. 640 */ 641 if (fstate > state) 642 state = fstate; 643 } 644 645 return state; 646 } 647 648 /* Currently those 2 are only used when MSIs are enabled, this will change 649 * but in the meantime, we need to protect them to avoid warnings 650 */ 651 #ifdef CONFIG_PCI_MSI 652 struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev) 653 { 654 struct pci_controller *hose = pci_bus_to_host(dev->bus); 655 struct pnv_phb *phb = hose->private_data; 656 struct pci_dn *pdn = pci_get_pdn(dev); 657 658 if (!pdn) 659 return NULL; 660 if (pdn->pe_number == IODA_INVALID_PE) 661 return NULL; 662 return &phb->ioda.pe_array[pdn->pe_number]; 663 } 664 #endif /* CONFIG_PCI_MSI */ 665 666 static int pnv_ioda_set_one_peltv(struct pnv_phb *phb, 667 struct pnv_ioda_pe *parent, 668 struct pnv_ioda_pe *child, 669 bool is_add) 670 { 671 const char *desc = is_add ? "adding" : "removing"; 672 uint8_t op = is_add ? OPAL_ADD_PE_TO_DOMAIN : 673 OPAL_REMOVE_PE_FROM_DOMAIN; 674 struct pnv_ioda_pe *slave; 675 long rc; 676 677 /* Parent PE affects child PE */ 678 rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number, 679 child->pe_number, op); 680 if (rc != OPAL_SUCCESS) { 681 pe_warn(child, "OPAL error %ld %s to parent PELTV\n", 682 rc, desc); 683 return -ENXIO; 684 } 685 686 if (!(child->flags & PNV_IODA_PE_MASTER)) 687 return 0; 688 689 /* Compound case: parent PE affects slave PEs */ 690 list_for_each_entry(slave, &child->slaves, list) { 691 rc = opal_pci_set_peltv(phb->opal_id, parent->pe_number, 692 slave->pe_number, op); 693 if (rc != OPAL_SUCCESS) { 694 pe_warn(slave, "OPAL error %ld %s to parent PELTV\n", 695 rc, desc); 696 return -ENXIO; 697 } 698 } 699 700 return 0; 701 } 702 703 static int pnv_ioda_set_peltv(struct pnv_phb *phb, 704 struct pnv_ioda_pe *pe, 705 bool is_add) 706 { 707 struct pnv_ioda_pe *slave; 708 struct pci_dev *pdev = NULL; 709 int ret; 710 711 /* 712 * Clear PE frozen state. If it's master PE, we need 713 * clear slave PE frozen state as well. 714 */ 715 if (is_add) { 716 opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number, 717 OPAL_EEH_ACTION_CLEAR_FREEZE_ALL); 718 if (pe->flags & PNV_IODA_PE_MASTER) { 719 list_for_each_entry(slave, &pe->slaves, list) 720 opal_pci_eeh_freeze_clear(phb->opal_id, 721 slave->pe_number, 722 OPAL_EEH_ACTION_CLEAR_FREEZE_ALL); 723 } 724 } 725 726 /* 727 * Associate PE in PELT. We need add the PE into the 728 * corresponding PELT-V as well. Otherwise, the error 729 * originated from the PE might contribute to other 730 * PEs. 731 */ 732 ret = pnv_ioda_set_one_peltv(phb, pe, pe, is_add); 733 if (ret) 734 return ret; 735 736 /* For compound PEs, any one affects all of them */ 737 if (pe->flags & PNV_IODA_PE_MASTER) { 738 list_for_each_entry(slave, &pe->slaves, list) { 739 ret = pnv_ioda_set_one_peltv(phb, slave, pe, is_add); 740 if (ret) 741 return ret; 742 } 743 } 744 745 if (pe->flags & (PNV_IODA_PE_BUS_ALL | PNV_IODA_PE_BUS)) 746 pdev = pe->pbus->self; 747 else if (pe->flags & PNV_IODA_PE_DEV) 748 pdev = pe->pdev->bus->self; 749 #ifdef CONFIG_PCI_IOV 750 else if (pe->flags & PNV_IODA_PE_VF) 751 pdev = pe->parent_dev; 752 #endif /* CONFIG_PCI_IOV */ 753 while (pdev) { 754 struct pci_dn *pdn = pci_get_pdn(pdev); 755 struct pnv_ioda_pe *parent; 756 757 if (pdn && pdn->pe_number != IODA_INVALID_PE) { 758 parent = &phb->ioda.pe_array[pdn->pe_number]; 759 ret = pnv_ioda_set_one_peltv(phb, parent, pe, is_add); 760 if (ret) 761 return ret; 762 } 763 764 pdev = pdev->bus->self; 765 } 766 767 return 0; 768 } 769 770 static int pnv_ioda_deconfigure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe) 771 { 772 struct pci_dev *parent; 773 uint8_t bcomp, dcomp, fcomp; 774 int64_t rc; 775 long rid_end, rid; 776 777 /* Currently, we just deconfigure VF PE. Bus PE will always there.*/ 778 if (pe->pbus) { 779 int count; 780 781 dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER; 782 fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER; 783 parent = pe->pbus->self; 784 if (pe->flags & PNV_IODA_PE_BUS_ALL) 785 count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1; 786 else 787 count = 1; 788 789 switch(count) { 790 case 1: bcomp = OpalPciBusAll; break; 791 case 2: bcomp = OpalPciBus7Bits; break; 792 case 4: bcomp = OpalPciBus6Bits; break; 793 case 8: bcomp = OpalPciBus5Bits; break; 794 case 16: bcomp = OpalPciBus4Bits; break; 795 case 32: bcomp = OpalPciBus3Bits; break; 796 default: 797 dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n", 798 count); 799 /* Do an exact match only */ 800 bcomp = OpalPciBusAll; 801 } 802 rid_end = pe->rid + (count << 8); 803 } else { 804 #ifdef CONFIG_PCI_IOV 805 if (pe->flags & PNV_IODA_PE_VF) 806 parent = pe->parent_dev; 807 else 808 #endif 809 parent = pe->pdev->bus->self; 810 bcomp = OpalPciBusAll; 811 dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER; 812 fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER; 813 rid_end = pe->rid + 1; 814 } 815 816 /* Clear the reverse map */ 817 for (rid = pe->rid; rid < rid_end; rid++) 818 phb->ioda.pe_rmap[rid] = IODA_INVALID_PE; 819 820 /* Release from all parents PELT-V */ 821 while (parent) { 822 struct pci_dn *pdn = pci_get_pdn(parent); 823 if (pdn && pdn->pe_number != IODA_INVALID_PE) { 824 rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number, 825 pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN); 826 /* XXX What to do in case of error ? */ 827 } 828 parent = parent->bus->self; 829 } 830 831 opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number, 832 OPAL_EEH_ACTION_CLEAR_FREEZE_ALL); 833 834 /* Disassociate PE in PELT */ 835 rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number, 836 pe->pe_number, OPAL_REMOVE_PE_FROM_DOMAIN); 837 if (rc) 838 pe_warn(pe, "OPAL error %ld remove self from PELTV\n", rc); 839 rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid, 840 bcomp, dcomp, fcomp, OPAL_UNMAP_PE); 841 if (rc) 842 pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc); 843 844 pe->pbus = NULL; 845 pe->pdev = NULL; 846 #ifdef CONFIG_PCI_IOV 847 pe->parent_dev = NULL; 848 #endif 849 850 return 0; 851 } 852 853 static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe) 854 { 855 struct pci_dev *parent; 856 uint8_t bcomp, dcomp, fcomp; 857 long rc, rid_end, rid; 858 859 /* Bus validation ? */ 860 if (pe->pbus) { 861 int count; 862 863 dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER; 864 fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER; 865 parent = pe->pbus->self; 866 if (pe->flags & PNV_IODA_PE_BUS_ALL) 867 count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1; 868 else 869 count = 1; 870 871 switch(count) { 872 case 1: bcomp = OpalPciBusAll; break; 873 case 2: bcomp = OpalPciBus7Bits; break; 874 case 4: bcomp = OpalPciBus6Bits; break; 875 case 8: bcomp = OpalPciBus5Bits; break; 876 case 16: bcomp = OpalPciBus4Bits; break; 877 case 32: bcomp = OpalPciBus3Bits; break; 878 default: 879 dev_err(&pe->pbus->dev, "Number of subordinate buses %d unsupported\n", 880 count); 881 /* Do an exact match only */ 882 bcomp = OpalPciBusAll; 883 } 884 rid_end = pe->rid + (count << 8); 885 } else { 886 #ifdef CONFIG_PCI_IOV 887 if (pe->flags & PNV_IODA_PE_VF) 888 parent = pe->parent_dev; 889 else 890 #endif /* CONFIG_PCI_IOV */ 891 parent = pe->pdev->bus->self; 892 bcomp = OpalPciBusAll; 893 dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER; 894 fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER; 895 rid_end = pe->rid + 1; 896 } 897 898 /* 899 * Associate PE in PELT. We need add the PE into the 900 * corresponding PELT-V as well. Otherwise, the error 901 * originated from the PE might contribute to other 902 * PEs. 903 */ 904 rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid, 905 bcomp, dcomp, fcomp, OPAL_MAP_PE); 906 if (rc) { 907 pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc); 908 return -ENXIO; 909 } 910 911 /* 912 * Configure PELTV. NPUs don't have a PELTV table so skip 913 * configuration on them. 914 */ 915 if (phb->type != PNV_PHB_NPU) 916 pnv_ioda_set_peltv(phb, pe, true); 917 918 /* Setup reverse map */ 919 for (rid = pe->rid; rid < rid_end; rid++) 920 phb->ioda.pe_rmap[rid] = pe->pe_number; 921 922 /* Setup one MVTs on IODA1 */ 923 if (phb->type != PNV_PHB_IODA1) { 924 pe->mve_number = 0; 925 goto out; 926 } 927 928 pe->mve_number = pe->pe_number; 929 rc = opal_pci_set_mve(phb->opal_id, pe->mve_number, pe->pe_number); 930 if (rc != OPAL_SUCCESS) { 931 pe_err(pe, "OPAL error %ld setting up MVE %d\n", 932 rc, pe->mve_number); 933 pe->mve_number = -1; 934 } else { 935 rc = opal_pci_set_mve_enable(phb->opal_id, 936 pe->mve_number, OPAL_ENABLE_MVE); 937 if (rc) { 938 pe_err(pe, "OPAL error %ld enabling MVE %d\n", 939 rc, pe->mve_number); 940 pe->mve_number = -1; 941 } 942 } 943 944 out: 945 return 0; 946 } 947 948 #ifdef CONFIG_PCI_IOV 949 static int pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset) 950 { 951 struct pci_dn *pdn = pci_get_pdn(dev); 952 int i; 953 struct resource *res, res2; 954 resource_size_t size; 955 u16 num_vfs; 956 957 if (!dev->is_physfn) 958 return -EINVAL; 959 960 /* 961 * "offset" is in VFs. The M64 windows are sized so that when they 962 * are segmented, each segment is the same size as the IOV BAR. 963 * Each segment is in a separate PE, and the high order bits of the 964 * address are the PE number. Therefore, each VF's BAR is in a 965 * separate PE, and changing the IOV BAR start address changes the 966 * range of PEs the VFs are in. 967 */ 968 num_vfs = pdn->num_vfs; 969 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 970 res = &dev->resource[i + PCI_IOV_RESOURCES]; 971 if (!res->flags || !res->parent) 972 continue; 973 974 /* 975 * The actual IOV BAR range is determined by the start address 976 * and the actual size for num_vfs VFs BAR. This check is to 977 * make sure that after shifting, the range will not overlap 978 * with another device. 979 */ 980 size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); 981 res2.flags = res->flags; 982 res2.start = res->start + (size * offset); 983 res2.end = res2.start + (size * num_vfs) - 1; 984 985 if (res2.end > res->end) { 986 dev_err(&dev->dev, "VF BAR%d: %pR would extend past %pR (trying to enable %d VFs shifted by %d)\n", 987 i, &res2, res, num_vfs, offset); 988 return -EBUSY; 989 } 990 } 991 992 /* 993 * After doing so, there would be a "hole" in the /proc/iomem when 994 * offset is a positive value. It looks like the device return some 995 * mmio back to the system, which actually no one could use it. 996 */ 997 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 998 res = &dev->resource[i + PCI_IOV_RESOURCES]; 999 if (!res->flags || !res->parent) 1000 continue; 1001 1002 size = pci_iov_resource_size(dev, i + PCI_IOV_RESOURCES); 1003 res2 = *res; 1004 res->start += size * offset; 1005 1006 dev_info(&dev->dev, "VF BAR%d: %pR shifted to %pR (%sabling %d VFs shifted by %d)\n", 1007 i, &res2, res, (offset > 0) ? "En" : "Dis", 1008 num_vfs, offset); 1009 pci_update_resource(dev, i + PCI_IOV_RESOURCES); 1010 } 1011 return 0; 1012 } 1013 #endif /* CONFIG_PCI_IOV */ 1014 1015 static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev) 1016 { 1017 struct pci_controller *hose = pci_bus_to_host(dev->bus); 1018 struct pnv_phb *phb = hose->private_data; 1019 struct pci_dn *pdn = pci_get_pdn(dev); 1020 struct pnv_ioda_pe *pe; 1021 1022 if (!pdn) { 1023 pr_err("%s: Device tree node not associated properly\n", 1024 pci_name(dev)); 1025 return NULL; 1026 } 1027 if (pdn->pe_number != IODA_INVALID_PE) 1028 return NULL; 1029 1030 pe = pnv_ioda_alloc_pe(phb); 1031 if (!pe) { 1032 pr_warning("%s: Not enough PE# available, disabling device\n", 1033 pci_name(dev)); 1034 return NULL; 1035 } 1036 1037 /* NOTE: We get only one ref to the pci_dev for the pdn, not for the 1038 * pointer in the PE data structure, both should be destroyed at the 1039 * same time. However, this needs to be looked at more closely again 1040 * once we actually start removing things (Hotplug, SR-IOV, ...) 1041 * 1042 * At some point we want to remove the PDN completely anyways 1043 */ 1044 pci_dev_get(dev); 1045 pdn->pcidev = dev; 1046 pdn->pe_number = pe->pe_number; 1047 pe->flags = PNV_IODA_PE_DEV; 1048 pe->pdev = dev; 1049 pe->pbus = NULL; 1050 pe->mve_number = -1; 1051 pe->rid = dev->bus->number << 8 | pdn->devfn; 1052 1053 pe_info(pe, "Associated device to PE\n"); 1054 1055 if (pnv_ioda_configure_pe(phb, pe)) { 1056 /* XXX What do we do here ? */ 1057 pnv_ioda_free_pe(pe); 1058 pdn->pe_number = IODA_INVALID_PE; 1059 pe->pdev = NULL; 1060 pci_dev_put(dev); 1061 return NULL; 1062 } 1063 1064 /* Put PE to the list */ 1065 list_add_tail(&pe->list, &phb->ioda.pe_list); 1066 1067 return pe; 1068 } 1069 1070 static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe) 1071 { 1072 struct pci_dev *dev; 1073 1074 list_for_each_entry(dev, &bus->devices, bus_list) { 1075 struct pci_dn *pdn = pci_get_pdn(dev); 1076 1077 if (pdn == NULL) { 1078 pr_warn("%s: No device node associated with device !\n", 1079 pci_name(dev)); 1080 continue; 1081 } 1082 1083 /* 1084 * In partial hotplug case, the PCI device might be still 1085 * associated with the PE and needn't attach it to the PE 1086 * again. 1087 */ 1088 if (pdn->pe_number != IODA_INVALID_PE) 1089 continue; 1090 1091 pe->device_count++; 1092 pdn->pcidev = dev; 1093 pdn->pe_number = pe->pe_number; 1094 if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate) 1095 pnv_ioda_setup_same_PE(dev->subordinate, pe); 1096 } 1097 } 1098 1099 /* 1100 * There're 2 types of PCI bus sensitive PEs: One that is compromised of 1101 * single PCI bus. Another one that contains the primary PCI bus and its 1102 * subordinate PCI devices and buses. The second type of PE is normally 1103 * orgiriated by PCIe-to-PCI bridge or PLX switch downstream ports. 1104 */ 1105 static struct pnv_ioda_pe *pnv_ioda_setup_bus_PE(struct pci_bus *bus, bool all) 1106 { 1107 struct pci_controller *hose = pci_bus_to_host(bus); 1108 struct pnv_phb *phb = hose->private_data; 1109 struct pnv_ioda_pe *pe = NULL; 1110 unsigned int pe_num; 1111 1112 /* 1113 * In partial hotplug case, the PE instance might be still alive. 1114 * We should reuse it instead of allocating a new one. 1115 */ 1116 pe_num = phb->ioda.pe_rmap[bus->number << 8]; 1117 if (pe_num != IODA_INVALID_PE) { 1118 pe = &phb->ioda.pe_array[pe_num]; 1119 pnv_ioda_setup_same_PE(bus, pe); 1120 return NULL; 1121 } 1122 1123 /* PE number for root bus should have been reserved */ 1124 if (pci_is_root_bus(bus) && 1125 phb->ioda.root_pe_idx != IODA_INVALID_PE) 1126 pe = &phb->ioda.pe_array[phb->ioda.root_pe_idx]; 1127 1128 /* Check if PE is determined by M64 */ 1129 if (!pe && phb->pick_m64_pe) 1130 pe = phb->pick_m64_pe(bus, all); 1131 1132 /* The PE number isn't pinned by M64 */ 1133 if (!pe) 1134 pe = pnv_ioda_alloc_pe(phb); 1135 1136 if (!pe) { 1137 pr_warning("%s: Not enough PE# available for PCI bus %04x:%02x\n", 1138 __func__, pci_domain_nr(bus), bus->number); 1139 return NULL; 1140 } 1141 1142 pe->flags |= (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS); 1143 pe->pbus = bus; 1144 pe->pdev = NULL; 1145 pe->mve_number = -1; 1146 pe->rid = bus->busn_res.start << 8; 1147 1148 if (all) 1149 pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n", 1150 bus->busn_res.start, bus->busn_res.end, pe->pe_number); 1151 else 1152 pe_info(pe, "Secondary bus %d associated with PE#%d\n", 1153 bus->busn_res.start, pe->pe_number); 1154 1155 if (pnv_ioda_configure_pe(phb, pe)) { 1156 /* XXX What do we do here ? */ 1157 pnv_ioda_free_pe(pe); 1158 pe->pbus = NULL; 1159 return NULL; 1160 } 1161 1162 /* Associate it with all child devices */ 1163 pnv_ioda_setup_same_PE(bus, pe); 1164 1165 /* Put PE to the list */ 1166 list_add_tail(&pe->list, &phb->ioda.pe_list); 1167 1168 return pe; 1169 } 1170 1171 static struct pnv_ioda_pe *pnv_ioda_setup_npu_PE(struct pci_dev *npu_pdev) 1172 { 1173 int pe_num, found_pe = false, rc; 1174 long rid; 1175 struct pnv_ioda_pe *pe; 1176 struct pci_dev *gpu_pdev; 1177 struct pci_dn *npu_pdn; 1178 struct pci_controller *hose = pci_bus_to_host(npu_pdev->bus); 1179 struct pnv_phb *phb = hose->private_data; 1180 1181 /* 1182 * Due to a hardware errata PE#0 on the NPU is reserved for 1183 * error handling. This means we only have three PEs remaining 1184 * which need to be assigned to four links, implying some 1185 * links must share PEs. 1186 * 1187 * To achieve this we assign PEs such that NPUs linking the 1188 * same GPU get assigned the same PE. 1189 */ 1190 gpu_pdev = pnv_pci_get_gpu_dev(npu_pdev); 1191 for (pe_num = 0; pe_num < phb->ioda.total_pe_num; pe_num++) { 1192 pe = &phb->ioda.pe_array[pe_num]; 1193 if (!pe->pdev) 1194 continue; 1195 1196 if (pnv_pci_get_gpu_dev(pe->pdev) == gpu_pdev) { 1197 /* 1198 * This device has the same peer GPU so should 1199 * be assigned the same PE as the existing 1200 * peer NPU. 1201 */ 1202 dev_info(&npu_pdev->dev, 1203 "Associating to existing PE %d\n", pe_num); 1204 pci_dev_get(npu_pdev); 1205 npu_pdn = pci_get_pdn(npu_pdev); 1206 rid = npu_pdev->bus->number << 8 | npu_pdn->devfn; 1207 npu_pdn->pcidev = npu_pdev; 1208 npu_pdn->pe_number = pe_num; 1209 phb->ioda.pe_rmap[rid] = pe->pe_number; 1210 1211 /* Map the PE to this link */ 1212 rc = opal_pci_set_pe(phb->opal_id, pe_num, rid, 1213 OpalPciBusAll, 1214 OPAL_COMPARE_RID_DEVICE_NUMBER, 1215 OPAL_COMPARE_RID_FUNCTION_NUMBER, 1216 OPAL_MAP_PE); 1217 WARN_ON(rc != OPAL_SUCCESS); 1218 found_pe = true; 1219 break; 1220 } 1221 } 1222 1223 if (!found_pe) 1224 /* 1225 * Could not find an existing PE so allocate a new 1226 * one. 1227 */ 1228 return pnv_ioda_setup_dev_PE(npu_pdev); 1229 else 1230 return pe; 1231 } 1232 1233 static void pnv_ioda_setup_npu_PEs(struct pci_bus *bus) 1234 { 1235 struct pci_dev *pdev; 1236 1237 list_for_each_entry(pdev, &bus->devices, bus_list) 1238 pnv_ioda_setup_npu_PE(pdev); 1239 } 1240 1241 static void pnv_pci_ioda_setup_PEs(void) 1242 { 1243 struct pci_controller *hose, *tmp; 1244 struct pnv_phb *phb; 1245 1246 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 1247 phb = hose->private_data; 1248 if (phb->type == PNV_PHB_NPU) { 1249 /* PE#0 is needed for error reporting */ 1250 pnv_ioda_reserve_pe(phb, 0); 1251 pnv_ioda_setup_npu_PEs(hose->bus); 1252 } 1253 } 1254 } 1255 1256 #ifdef CONFIG_PCI_IOV 1257 static int pnv_pci_vf_release_m64(struct pci_dev *pdev, u16 num_vfs) 1258 { 1259 struct pci_bus *bus; 1260 struct pci_controller *hose; 1261 struct pnv_phb *phb; 1262 struct pci_dn *pdn; 1263 int i, j; 1264 int m64_bars; 1265 1266 bus = pdev->bus; 1267 hose = pci_bus_to_host(bus); 1268 phb = hose->private_data; 1269 pdn = pci_get_pdn(pdev); 1270 1271 if (pdn->m64_single_mode) 1272 m64_bars = num_vfs; 1273 else 1274 m64_bars = 1; 1275 1276 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) 1277 for (j = 0; j < m64_bars; j++) { 1278 if (pdn->m64_map[j][i] == IODA_INVALID_M64) 1279 continue; 1280 opal_pci_phb_mmio_enable(phb->opal_id, 1281 OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 0); 1282 clear_bit(pdn->m64_map[j][i], &phb->ioda.m64_bar_alloc); 1283 pdn->m64_map[j][i] = IODA_INVALID_M64; 1284 } 1285 1286 kfree(pdn->m64_map); 1287 return 0; 1288 } 1289 1290 static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs) 1291 { 1292 struct pci_bus *bus; 1293 struct pci_controller *hose; 1294 struct pnv_phb *phb; 1295 struct pci_dn *pdn; 1296 unsigned int win; 1297 struct resource *res; 1298 int i, j; 1299 int64_t rc; 1300 int total_vfs; 1301 resource_size_t size, start; 1302 int pe_num; 1303 int m64_bars; 1304 1305 bus = pdev->bus; 1306 hose = pci_bus_to_host(bus); 1307 phb = hose->private_data; 1308 pdn = pci_get_pdn(pdev); 1309 total_vfs = pci_sriov_get_totalvfs(pdev); 1310 1311 if (pdn->m64_single_mode) 1312 m64_bars = num_vfs; 1313 else 1314 m64_bars = 1; 1315 1316 pdn->m64_map = kmalloc(sizeof(*pdn->m64_map) * m64_bars, GFP_KERNEL); 1317 if (!pdn->m64_map) 1318 return -ENOMEM; 1319 /* Initialize the m64_map to IODA_INVALID_M64 */ 1320 for (i = 0; i < m64_bars ; i++) 1321 for (j = 0; j < PCI_SRIOV_NUM_BARS; j++) 1322 pdn->m64_map[i][j] = IODA_INVALID_M64; 1323 1324 1325 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 1326 res = &pdev->resource[i + PCI_IOV_RESOURCES]; 1327 if (!res->flags || !res->parent) 1328 continue; 1329 1330 for (j = 0; j < m64_bars; j++) { 1331 do { 1332 win = find_next_zero_bit(&phb->ioda.m64_bar_alloc, 1333 phb->ioda.m64_bar_idx + 1, 0); 1334 1335 if (win >= phb->ioda.m64_bar_idx + 1) 1336 goto m64_failed; 1337 } while (test_and_set_bit(win, &phb->ioda.m64_bar_alloc)); 1338 1339 pdn->m64_map[j][i] = win; 1340 1341 if (pdn->m64_single_mode) { 1342 size = pci_iov_resource_size(pdev, 1343 PCI_IOV_RESOURCES + i); 1344 start = res->start + size * j; 1345 } else { 1346 size = resource_size(res); 1347 start = res->start; 1348 } 1349 1350 /* Map the M64 here */ 1351 if (pdn->m64_single_mode) { 1352 pe_num = pdn->pe_num_map[j]; 1353 rc = opal_pci_map_pe_mmio_window(phb->opal_id, 1354 pe_num, OPAL_M64_WINDOW_TYPE, 1355 pdn->m64_map[j][i], 0); 1356 } 1357 1358 rc = opal_pci_set_phb_mem_window(phb->opal_id, 1359 OPAL_M64_WINDOW_TYPE, 1360 pdn->m64_map[j][i], 1361 start, 1362 0, /* unused */ 1363 size); 1364 1365 1366 if (rc != OPAL_SUCCESS) { 1367 dev_err(&pdev->dev, "Failed to map M64 window #%d: %lld\n", 1368 win, rc); 1369 goto m64_failed; 1370 } 1371 1372 if (pdn->m64_single_mode) 1373 rc = opal_pci_phb_mmio_enable(phb->opal_id, 1374 OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 2); 1375 else 1376 rc = opal_pci_phb_mmio_enable(phb->opal_id, 1377 OPAL_M64_WINDOW_TYPE, pdn->m64_map[j][i], 1); 1378 1379 if (rc != OPAL_SUCCESS) { 1380 dev_err(&pdev->dev, "Failed to enable M64 window #%d: %llx\n", 1381 win, rc); 1382 goto m64_failed; 1383 } 1384 } 1385 } 1386 return 0; 1387 1388 m64_failed: 1389 pnv_pci_vf_release_m64(pdev, num_vfs); 1390 return -EBUSY; 1391 } 1392 1393 static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group, 1394 int num); 1395 static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable); 1396 1397 static void pnv_pci_ioda2_release_dma_pe(struct pci_dev *dev, struct pnv_ioda_pe *pe) 1398 { 1399 struct iommu_table *tbl; 1400 int64_t rc; 1401 1402 tbl = pe->table_group.tables[0]; 1403 rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0); 1404 if (rc) 1405 pe_warn(pe, "OPAL error %ld release DMA window\n", rc); 1406 1407 pnv_pci_ioda2_set_bypass(pe, false); 1408 if (pe->table_group.group) { 1409 iommu_group_put(pe->table_group.group); 1410 BUG_ON(pe->table_group.group); 1411 } 1412 pnv_pci_ioda2_table_free_pages(tbl); 1413 iommu_free_table(tbl, of_node_full_name(dev->dev.of_node)); 1414 } 1415 1416 static void pnv_ioda_release_vf_PE(struct pci_dev *pdev) 1417 { 1418 struct pci_bus *bus; 1419 struct pci_controller *hose; 1420 struct pnv_phb *phb; 1421 struct pnv_ioda_pe *pe, *pe_n; 1422 struct pci_dn *pdn; 1423 1424 bus = pdev->bus; 1425 hose = pci_bus_to_host(bus); 1426 phb = hose->private_data; 1427 pdn = pci_get_pdn(pdev); 1428 1429 if (!pdev->is_physfn) 1430 return; 1431 1432 list_for_each_entry_safe(pe, pe_n, &phb->ioda.pe_list, list) { 1433 if (pe->parent_dev != pdev) 1434 continue; 1435 1436 pnv_pci_ioda2_release_dma_pe(pdev, pe); 1437 1438 /* Remove from list */ 1439 mutex_lock(&phb->ioda.pe_list_mutex); 1440 list_del(&pe->list); 1441 mutex_unlock(&phb->ioda.pe_list_mutex); 1442 1443 pnv_ioda_deconfigure_pe(phb, pe); 1444 1445 pnv_ioda_free_pe(pe); 1446 } 1447 } 1448 1449 void pnv_pci_sriov_disable(struct pci_dev *pdev) 1450 { 1451 struct pci_bus *bus; 1452 struct pci_controller *hose; 1453 struct pnv_phb *phb; 1454 struct pnv_ioda_pe *pe; 1455 struct pci_dn *pdn; 1456 struct pci_sriov *iov; 1457 u16 num_vfs, i; 1458 1459 bus = pdev->bus; 1460 hose = pci_bus_to_host(bus); 1461 phb = hose->private_data; 1462 pdn = pci_get_pdn(pdev); 1463 iov = pdev->sriov; 1464 num_vfs = pdn->num_vfs; 1465 1466 /* Release VF PEs */ 1467 pnv_ioda_release_vf_PE(pdev); 1468 1469 if (phb->type == PNV_PHB_IODA2) { 1470 if (!pdn->m64_single_mode) 1471 pnv_pci_vf_resource_shift(pdev, -*pdn->pe_num_map); 1472 1473 /* Release M64 windows */ 1474 pnv_pci_vf_release_m64(pdev, num_vfs); 1475 1476 /* Release PE numbers */ 1477 if (pdn->m64_single_mode) { 1478 for (i = 0; i < num_vfs; i++) { 1479 if (pdn->pe_num_map[i] == IODA_INVALID_PE) 1480 continue; 1481 1482 pe = &phb->ioda.pe_array[pdn->pe_num_map[i]]; 1483 pnv_ioda_free_pe(pe); 1484 } 1485 } else 1486 bitmap_clear(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs); 1487 /* Releasing pe_num_map */ 1488 kfree(pdn->pe_num_map); 1489 } 1490 } 1491 1492 static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, 1493 struct pnv_ioda_pe *pe); 1494 static void pnv_ioda_setup_vf_PE(struct pci_dev *pdev, u16 num_vfs) 1495 { 1496 struct pci_bus *bus; 1497 struct pci_controller *hose; 1498 struct pnv_phb *phb; 1499 struct pnv_ioda_pe *pe; 1500 int pe_num; 1501 u16 vf_index; 1502 struct pci_dn *pdn; 1503 1504 bus = pdev->bus; 1505 hose = pci_bus_to_host(bus); 1506 phb = hose->private_data; 1507 pdn = pci_get_pdn(pdev); 1508 1509 if (!pdev->is_physfn) 1510 return; 1511 1512 /* Reserve PE for each VF */ 1513 for (vf_index = 0; vf_index < num_vfs; vf_index++) { 1514 if (pdn->m64_single_mode) 1515 pe_num = pdn->pe_num_map[vf_index]; 1516 else 1517 pe_num = *pdn->pe_num_map + vf_index; 1518 1519 pe = &phb->ioda.pe_array[pe_num]; 1520 pe->pe_number = pe_num; 1521 pe->phb = phb; 1522 pe->flags = PNV_IODA_PE_VF; 1523 pe->pbus = NULL; 1524 pe->parent_dev = pdev; 1525 pe->mve_number = -1; 1526 pe->rid = (pci_iov_virtfn_bus(pdev, vf_index) << 8) | 1527 pci_iov_virtfn_devfn(pdev, vf_index); 1528 1529 pe_info(pe, "VF %04d:%02d:%02d.%d associated with PE#%d\n", 1530 hose->global_number, pdev->bus->number, 1531 PCI_SLOT(pci_iov_virtfn_devfn(pdev, vf_index)), 1532 PCI_FUNC(pci_iov_virtfn_devfn(pdev, vf_index)), pe_num); 1533 1534 if (pnv_ioda_configure_pe(phb, pe)) { 1535 /* XXX What do we do here ? */ 1536 pnv_ioda_free_pe(pe); 1537 pe->pdev = NULL; 1538 continue; 1539 } 1540 1541 /* Put PE to the list */ 1542 mutex_lock(&phb->ioda.pe_list_mutex); 1543 list_add_tail(&pe->list, &phb->ioda.pe_list); 1544 mutex_unlock(&phb->ioda.pe_list_mutex); 1545 1546 pnv_pci_ioda2_setup_dma_pe(phb, pe); 1547 } 1548 } 1549 1550 int pnv_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs) 1551 { 1552 struct pci_bus *bus; 1553 struct pci_controller *hose; 1554 struct pnv_phb *phb; 1555 struct pnv_ioda_pe *pe; 1556 struct pci_dn *pdn; 1557 int ret; 1558 u16 i; 1559 1560 bus = pdev->bus; 1561 hose = pci_bus_to_host(bus); 1562 phb = hose->private_data; 1563 pdn = pci_get_pdn(pdev); 1564 1565 if (phb->type == PNV_PHB_IODA2) { 1566 if (!pdn->vfs_expanded) { 1567 dev_info(&pdev->dev, "don't support this SRIOV device" 1568 " with non 64bit-prefetchable IOV BAR\n"); 1569 return -ENOSPC; 1570 } 1571 1572 /* 1573 * When M64 BARs functions in Single PE mode, the number of VFs 1574 * could be enabled must be less than the number of M64 BARs. 1575 */ 1576 if (pdn->m64_single_mode && num_vfs > phb->ioda.m64_bar_idx) { 1577 dev_info(&pdev->dev, "Not enough M64 BAR for VFs\n"); 1578 return -EBUSY; 1579 } 1580 1581 /* Allocating pe_num_map */ 1582 if (pdn->m64_single_mode) 1583 pdn->pe_num_map = kmalloc(sizeof(*pdn->pe_num_map) * num_vfs, 1584 GFP_KERNEL); 1585 else 1586 pdn->pe_num_map = kmalloc(sizeof(*pdn->pe_num_map), GFP_KERNEL); 1587 1588 if (!pdn->pe_num_map) 1589 return -ENOMEM; 1590 1591 if (pdn->m64_single_mode) 1592 for (i = 0; i < num_vfs; i++) 1593 pdn->pe_num_map[i] = IODA_INVALID_PE; 1594 1595 /* Calculate available PE for required VFs */ 1596 if (pdn->m64_single_mode) { 1597 for (i = 0; i < num_vfs; i++) { 1598 pe = pnv_ioda_alloc_pe(phb); 1599 if (!pe) { 1600 ret = -EBUSY; 1601 goto m64_failed; 1602 } 1603 1604 pdn->pe_num_map[i] = pe->pe_number; 1605 } 1606 } else { 1607 mutex_lock(&phb->ioda.pe_alloc_mutex); 1608 *pdn->pe_num_map = bitmap_find_next_zero_area( 1609 phb->ioda.pe_alloc, phb->ioda.total_pe_num, 1610 0, num_vfs, 0); 1611 if (*pdn->pe_num_map >= phb->ioda.total_pe_num) { 1612 mutex_unlock(&phb->ioda.pe_alloc_mutex); 1613 dev_info(&pdev->dev, "Failed to enable VF%d\n", num_vfs); 1614 kfree(pdn->pe_num_map); 1615 return -EBUSY; 1616 } 1617 bitmap_set(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs); 1618 mutex_unlock(&phb->ioda.pe_alloc_mutex); 1619 } 1620 pdn->num_vfs = num_vfs; 1621 1622 /* Assign M64 window accordingly */ 1623 ret = pnv_pci_vf_assign_m64(pdev, num_vfs); 1624 if (ret) { 1625 dev_info(&pdev->dev, "Not enough M64 window resources\n"); 1626 goto m64_failed; 1627 } 1628 1629 /* 1630 * When using one M64 BAR to map one IOV BAR, we need to shift 1631 * the IOV BAR according to the PE# allocated to the VFs. 1632 * Otherwise, the PE# for the VF will conflict with others. 1633 */ 1634 if (!pdn->m64_single_mode) { 1635 ret = pnv_pci_vf_resource_shift(pdev, *pdn->pe_num_map); 1636 if (ret) 1637 goto m64_failed; 1638 } 1639 } 1640 1641 /* Setup VF PEs */ 1642 pnv_ioda_setup_vf_PE(pdev, num_vfs); 1643 1644 return 0; 1645 1646 m64_failed: 1647 if (pdn->m64_single_mode) { 1648 for (i = 0; i < num_vfs; i++) { 1649 if (pdn->pe_num_map[i] == IODA_INVALID_PE) 1650 continue; 1651 1652 pe = &phb->ioda.pe_array[pdn->pe_num_map[i]]; 1653 pnv_ioda_free_pe(pe); 1654 } 1655 } else 1656 bitmap_clear(phb->ioda.pe_alloc, *pdn->pe_num_map, num_vfs); 1657 1658 /* Releasing pe_num_map */ 1659 kfree(pdn->pe_num_map); 1660 1661 return ret; 1662 } 1663 1664 int pcibios_sriov_disable(struct pci_dev *pdev) 1665 { 1666 pnv_pci_sriov_disable(pdev); 1667 1668 /* Release PCI data */ 1669 remove_dev_pci_data(pdev); 1670 return 0; 1671 } 1672 1673 int pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs) 1674 { 1675 /* Allocate PCI data */ 1676 add_dev_pci_data(pdev); 1677 1678 return pnv_pci_sriov_enable(pdev, num_vfs); 1679 } 1680 #endif /* CONFIG_PCI_IOV */ 1681 1682 static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev) 1683 { 1684 struct pci_dn *pdn = pci_get_pdn(pdev); 1685 struct pnv_ioda_pe *pe; 1686 1687 /* 1688 * The function can be called while the PE# 1689 * hasn't been assigned. Do nothing for the 1690 * case. 1691 */ 1692 if (!pdn || pdn->pe_number == IODA_INVALID_PE) 1693 return; 1694 1695 pe = &phb->ioda.pe_array[pdn->pe_number]; 1696 WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops); 1697 set_dma_offset(&pdev->dev, pe->tce_bypass_base); 1698 set_iommu_table_base(&pdev->dev, pe->table_group.tables[0]); 1699 /* 1700 * Note: iommu_add_device() will fail here as 1701 * for physical PE: the device is already added by now; 1702 * for virtual PE: sysfs entries are not ready yet and 1703 * tce_iommu_bus_notifier will add the device to a group later. 1704 */ 1705 } 1706 1707 static int pnv_pci_ioda_dma_set_mask(struct pci_dev *pdev, u64 dma_mask) 1708 { 1709 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 1710 struct pnv_phb *phb = hose->private_data; 1711 struct pci_dn *pdn = pci_get_pdn(pdev); 1712 struct pnv_ioda_pe *pe; 1713 uint64_t top; 1714 bool bypass = false; 1715 1716 if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE)) 1717 return -ENODEV;; 1718 1719 pe = &phb->ioda.pe_array[pdn->pe_number]; 1720 if (pe->tce_bypass_enabled) { 1721 top = pe->tce_bypass_base + memblock_end_of_DRAM() - 1; 1722 bypass = (dma_mask >= top); 1723 } 1724 1725 if (bypass) { 1726 dev_info(&pdev->dev, "Using 64-bit DMA iommu bypass\n"); 1727 set_dma_ops(&pdev->dev, &dma_direct_ops); 1728 } else { 1729 dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n"); 1730 set_dma_ops(&pdev->dev, &dma_iommu_ops); 1731 } 1732 *pdev->dev.dma_mask = dma_mask; 1733 1734 /* Update peer npu devices */ 1735 pnv_npu_try_dma_set_bypass(pdev, bypass); 1736 1737 return 0; 1738 } 1739 1740 static u64 pnv_pci_ioda_dma_get_required_mask(struct pci_dev *pdev) 1741 { 1742 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 1743 struct pnv_phb *phb = hose->private_data; 1744 struct pci_dn *pdn = pci_get_pdn(pdev); 1745 struct pnv_ioda_pe *pe; 1746 u64 end, mask; 1747 1748 if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE)) 1749 return 0; 1750 1751 pe = &phb->ioda.pe_array[pdn->pe_number]; 1752 if (!pe->tce_bypass_enabled) 1753 return __dma_get_required_mask(&pdev->dev); 1754 1755 1756 end = pe->tce_bypass_base + memblock_end_of_DRAM(); 1757 mask = 1ULL << (fls64(end) - 1); 1758 mask += mask - 1; 1759 1760 return mask; 1761 } 1762 1763 static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, 1764 struct pci_bus *bus) 1765 { 1766 struct pci_dev *dev; 1767 1768 list_for_each_entry(dev, &bus->devices, bus_list) { 1769 set_iommu_table_base(&dev->dev, pe->table_group.tables[0]); 1770 set_dma_offset(&dev->dev, pe->tce_bypass_base); 1771 iommu_add_device(&dev->dev); 1772 1773 if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate) 1774 pnv_ioda_setup_bus_dma(pe, dev->subordinate); 1775 } 1776 } 1777 1778 static inline __be64 __iomem *pnv_ioda_get_inval_reg(struct pnv_phb *phb, 1779 bool real_mode) 1780 { 1781 return real_mode ? (__be64 __iomem *)(phb->regs_phys + 0x210) : 1782 (phb->regs + 0x210); 1783 } 1784 1785 static void pnv_pci_p7ioc_tce_invalidate(struct iommu_table *tbl, 1786 unsigned long index, unsigned long npages, bool rm) 1787 { 1788 struct iommu_table_group_link *tgl = list_first_entry_or_null( 1789 &tbl->it_group_list, struct iommu_table_group_link, 1790 next); 1791 struct pnv_ioda_pe *pe = container_of(tgl->table_group, 1792 struct pnv_ioda_pe, table_group); 1793 __be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb, rm); 1794 unsigned long start, end, inc; 1795 1796 start = __pa(((__be64 *)tbl->it_base) + index - tbl->it_offset); 1797 end = __pa(((__be64 *)tbl->it_base) + index - tbl->it_offset + 1798 npages - 1); 1799 1800 /* p7ioc-style invalidation, 2 TCEs per write */ 1801 start |= (1ull << 63); 1802 end |= (1ull << 63); 1803 inc = 16; 1804 end |= inc - 1; /* round up end to be different than start */ 1805 1806 mb(); /* Ensure above stores are visible */ 1807 while (start <= end) { 1808 if (rm) 1809 __raw_rm_writeq(cpu_to_be64(start), invalidate); 1810 else 1811 __raw_writeq(cpu_to_be64(start), invalidate); 1812 start += inc; 1813 } 1814 1815 /* 1816 * The iommu layer will do another mb() for us on build() 1817 * and we don't care on free() 1818 */ 1819 } 1820 1821 static int pnv_ioda1_tce_build(struct iommu_table *tbl, long index, 1822 long npages, unsigned long uaddr, 1823 enum dma_data_direction direction, 1824 unsigned long attrs) 1825 { 1826 int ret = pnv_tce_build(tbl, index, npages, uaddr, direction, 1827 attrs); 1828 1829 if (!ret) 1830 pnv_pci_p7ioc_tce_invalidate(tbl, index, npages, false); 1831 1832 return ret; 1833 } 1834 1835 #ifdef CONFIG_IOMMU_API 1836 static int pnv_ioda1_tce_xchg(struct iommu_table *tbl, long index, 1837 unsigned long *hpa, enum dma_data_direction *direction) 1838 { 1839 long ret = pnv_tce_xchg(tbl, index, hpa, direction); 1840 1841 if (!ret) 1842 pnv_pci_p7ioc_tce_invalidate(tbl, index, 1, false); 1843 1844 return ret; 1845 } 1846 #endif 1847 1848 static void pnv_ioda1_tce_free(struct iommu_table *tbl, long index, 1849 long npages) 1850 { 1851 pnv_tce_free(tbl, index, npages); 1852 1853 pnv_pci_p7ioc_tce_invalidate(tbl, index, npages, false); 1854 } 1855 1856 static struct iommu_table_ops pnv_ioda1_iommu_ops = { 1857 .set = pnv_ioda1_tce_build, 1858 #ifdef CONFIG_IOMMU_API 1859 .exchange = pnv_ioda1_tce_xchg, 1860 #endif 1861 .clear = pnv_ioda1_tce_free, 1862 .get = pnv_tce_get, 1863 }; 1864 1865 #define PHB3_TCE_KILL_INVAL_ALL PPC_BIT(0) 1866 #define PHB3_TCE_KILL_INVAL_PE PPC_BIT(1) 1867 #define PHB3_TCE_KILL_INVAL_ONE PPC_BIT(2) 1868 1869 void pnv_pci_phb3_tce_invalidate_entire(struct pnv_phb *phb, bool rm) 1870 { 1871 __be64 __iomem *invalidate = pnv_ioda_get_inval_reg(phb, rm); 1872 const unsigned long val = PHB3_TCE_KILL_INVAL_ALL; 1873 1874 mb(); /* Ensure previous TCE table stores are visible */ 1875 if (rm) 1876 __raw_rm_writeq(cpu_to_be64(val), invalidate); 1877 else 1878 __raw_writeq(cpu_to_be64(val), invalidate); 1879 } 1880 1881 static inline void pnv_pci_phb3_tce_invalidate_pe(struct pnv_ioda_pe *pe) 1882 { 1883 /* 01xb - invalidate TCEs that match the specified PE# */ 1884 __be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb, false); 1885 unsigned long val = PHB3_TCE_KILL_INVAL_PE | (pe->pe_number & 0xFF); 1886 1887 mb(); /* Ensure above stores are visible */ 1888 __raw_writeq(cpu_to_be64(val), invalidate); 1889 } 1890 1891 static void pnv_pci_phb3_tce_invalidate(struct pnv_ioda_pe *pe, bool rm, 1892 unsigned shift, unsigned long index, 1893 unsigned long npages) 1894 { 1895 __be64 __iomem *invalidate = pnv_ioda_get_inval_reg(pe->phb, rm); 1896 unsigned long start, end, inc; 1897 1898 /* We'll invalidate DMA address in PE scope */ 1899 start = PHB3_TCE_KILL_INVAL_ONE; 1900 start |= (pe->pe_number & 0xFF); 1901 end = start; 1902 1903 /* Figure out the start, end and step */ 1904 start |= (index << shift); 1905 end |= ((index + npages - 1) << shift); 1906 inc = (0x1ull << shift); 1907 mb(); 1908 1909 while (start <= end) { 1910 if (rm) 1911 __raw_rm_writeq(cpu_to_be64(start), invalidate); 1912 else 1913 __raw_writeq(cpu_to_be64(start), invalidate); 1914 start += inc; 1915 } 1916 } 1917 1918 static inline void pnv_pci_ioda2_tce_invalidate_pe(struct pnv_ioda_pe *pe) 1919 { 1920 struct pnv_phb *phb = pe->phb; 1921 1922 if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs) 1923 pnv_pci_phb3_tce_invalidate_pe(pe); 1924 else 1925 opal_pci_tce_kill(phb->opal_id, OPAL_PCI_TCE_KILL_PE, 1926 pe->pe_number, 0, 0, 0); 1927 } 1928 1929 static void pnv_pci_ioda2_tce_invalidate(struct iommu_table *tbl, 1930 unsigned long index, unsigned long npages, bool rm) 1931 { 1932 struct iommu_table_group_link *tgl; 1933 1934 list_for_each_entry_rcu(tgl, &tbl->it_group_list, next) { 1935 struct pnv_ioda_pe *pe = container_of(tgl->table_group, 1936 struct pnv_ioda_pe, table_group); 1937 struct pnv_phb *phb = pe->phb; 1938 unsigned int shift = tbl->it_page_shift; 1939 1940 if (phb->type == PNV_PHB_NPU) { 1941 /* 1942 * The NVLink hardware does not support TCE kill 1943 * per TCE entry so we have to invalidate 1944 * the entire cache for it. 1945 */ 1946 pnv_pci_phb3_tce_invalidate_entire(phb, rm); 1947 continue; 1948 } 1949 if (phb->model == PNV_PHB_MODEL_PHB3 && phb->regs) 1950 pnv_pci_phb3_tce_invalidate(pe, rm, shift, 1951 index, npages); 1952 else if (rm) 1953 opal_rm_pci_tce_kill(phb->opal_id, 1954 OPAL_PCI_TCE_KILL_PAGES, 1955 pe->pe_number, 1u << shift, 1956 index << shift, npages); 1957 else 1958 opal_pci_tce_kill(phb->opal_id, 1959 OPAL_PCI_TCE_KILL_PAGES, 1960 pe->pe_number, 1u << shift, 1961 index << shift, npages); 1962 } 1963 } 1964 1965 static int pnv_ioda2_tce_build(struct iommu_table *tbl, long index, 1966 long npages, unsigned long uaddr, 1967 enum dma_data_direction direction, 1968 unsigned long attrs) 1969 { 1970 int ret = pnv_tce_build(tbl, index, npages, uaddr, direction, 1971 attrs); 1972 1973 if (!ret) 1974 pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false); 1975 1976 return ret; 1977 } 1978 1979 #ifdef CONFIG_IOMMU_API 1980 static int pnv_ioda2_tce_xchg(struct iommu_table *tbl, long index, 1981 unsigned long *hpa, enum dma_data_direction *direction) 1982 { 1983 long ret = pnv_tce_xchg(tbl, index, hpa, direction); 1984 1985 if (!ret) 1986 pnv_pci_ioda2_tce_invalidate(tbl, index, 1, false); 1987 1988 return ret; 1989 } 1990 #endif 1991 1992 static void pnv_ioda2_tce_free(struct iommu_table *tbl, long index, 1993 long npages) 1994 { 1995 pnv_tce_free(tbl, index, npages); 1996 1997 pnv_pci_ioda2_tce_invalidate(tbl, index, npages, false); 1998 } 1999 2000 static void pnv_ioda2_table_free(struct iommu_table *tbl) 2001 { 2002 pnv_pci_ioda2_table_free_pages(tbl); 2003 iommu_free_table(tbl, "pnv"); 2004 } 2005 2006 static struct iommu_table_ops pnv_ioda2_iommu_ops = { 2007 .set = pnv_ioda2_tce_build, 2008 #ifdef CONFIG_IOMMU_API 2009 .exchange = pnv_ioda2_tce_xchg, 2010 #endif 2011 .clear = pnv_ioda2_tce_free, 2012 .get = pnv_tce_get, 2013 .free = pnv_ioda2_table_free, 2014 }; 2015 2016 static int pnv_pci_ioda_dev_dma_weight(struct pci_dev *dev, void *data) 2017 { 2018 unsigned int *weight = (unsigned int *)data; 2019 2020 /* This is quite simplistic. The "base" weight of a device 2021 * is 10. 0 means no DMA is to be accounted for it. 2022 */ 2023 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) 2024 return 0; 2025 2026 if (dev->class == PCI_CLASS_SERIAL_USB_UHCI || 2027 dev->class == PCI_CLASS_SERIAL_USB_OHCI || 2028 dev->class == PCI_CLASS_SERIAL_USB_EHCI) 2029 *weight += 3; 2030 else if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID) 2031 *weight += 15; 2032 else 2033 *weight += 10; 2034 2035 return 0; 2036 } 2037 2038 static unsigned int pnv_pci_ioda_pe_dma_weight(struct pnv_ioda_pe *pe) 2039 { 2040 unsigned int weight = 0; 2041 2042 /* SRIOV VF has same DMA32 weight as its PF */ 2043 #ifdef CONFIG_PCI_IOV 2044 if ((pe->flags & PNV_IODA_PE_VF) && pe->parent_dev) { 2045 pnv_pci_ioda_dev_dma_weight(pe->parent_dev, &weight); 2046 return weight; 2047 } 2048 #endif 2049 2050 if ((pe->flags & PNV_IODA_PE_DEV) && pe->pdev) { 2051 pnv_pci_ioda_dev_dma_weight(pe->pdev, &weight); 2052 } else if ((pe->flags & PNV_IODA_PE_BUS) && pe->pbus) { 2053 struct pci_dev *pdev; 2054 2055 list_for_each_entry(pdev, &pe->pbus->devices, bus_list) 2056 pnv_pci_ioda_dev_dma_weight(pdev, &weight); 2057 } else if ((pe->flags & PNV_IODA_PE_BUS_ALL) && pe->pbus) { 2058 pci_walk_bus(pe->pbus, pnv_pci_ioda_dev_dma_weight, &weight); 2059 } 2060 2061 return weight; 2062 } 2063 2064 static void pnv_pci_ioda1_setup_dma_pe(struct pnv_phb *phb, 2065 struct pnv_ioda_pe *pe) 2066 { 2067 2068 struct page *tce_mem = NULL; 2069 struct iommu_table *tbl; 2070 unsigned int weight, total_weight = 0; 2071 unsigned int tce32_segsz, base, segs, avail, i; 2072 int64_t rc; 2073 void *addr; 2074 2075 /* XXX FIXME: Handle 64-bit only DMA devices */ 2076 /* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */ 2077 /* XXX FIXME: Allocate multi-level tables on PHB3 */ 2078 weight = pnv_pci_ioda_pe_dma_weight(pe); 2079 if (!weight) 2080 return; 2081 2082 pci_walk_bus(phb->hose->bus, pnv_pci_ioda_dev_dma_weight, 2083 &total_weight); 2084 segs = (weight * phb->ioda.dma32_count) / total_weight; 2085 if (!segs) 2086 segs = 1; 2087 2088 /* 2089 * Allocate contiguous DMA32 segments. We begin with the expected 2090 * number of segments. With one more attempt, the number of DMA32 2091 * segments to be allocated is decreased by one until one segment 2092 * is allocated successfully. 2093 */ 2094 do { 2095 for (base = 0; base <= phb->ioda.dma32_count - segs; base++) { 2096 for (avail = 0, i = base; i < base + segs; i++) { 2097 if (phb->ioda.dma32_segmap[i] == 2098 IODA_INVALID_PE) 2099 avail++; 2100 } 2101 2102 if (avail == segs) 2103 goto found; 2104 } 2105 } while (--segs); 2106 2107 if (!segs) { 2108 pe_warn(pe, "No available DMA32 segments\n"); 2109 return; 2110 } 2111 2112 found: 2113 tbl = pnv_pci_table_alloc(phb->hose->node); 2114 iommu_register_group(&pe->table_group, phb->hose->global_number, 2115 pe->pe_number); 2116 pnv_pci_link_table_and_group(phb->hose->node, 0, tbl, &pe->table_group); 2117 2118 /* Grab a 32-bit TCE table */ 2119 pe_info(pe, "DMA weight %d (%d), assigned (%d) %d DMA32 segments\n", 2120 weight, total_weight, base, segs); 2121 pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n", 2122 base * PNV_IODA1_DMA32_SEGSIZE, 2123 (base + segs) * PNV_IODA1_DMA32_SEGSIZE - 1); 2124 2125 /* XXX Currently, we allocate one big contiguous table for the 2126 * TCEs. We only really need one chunk per 256M of TCE space 2127 * (ie per segment) but that's an optimization for later, it 2128 * requires some added smarts with our get/put_tce implementation 2129 * 2130 * Each TCE page is 4KB in size and each TCE entry occupies 8 2131 * bytes 2132 */ 2133 tce32_segsz = PNV_IODA1_DMA32_SEGSIZE >> (IOMMU_PAGE_SHIFT_4K - 3); 2134 tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL, 2135 get_order(tce32_segsz * segs)); 2136 if (!tce_mem) { 2137 pe_err(pe, " Failed to allocate a 32-bit TCE memory\n"); 2138 goto fail; 2139 } 2140 addr = page_address(tce_mem); 2141 memset(addr, 0, tce32_segsz * segs); 2142 2143 /* Configure HW */ 2144 for (i = 0; i < segs; i++) { 2145 rc = opal_pci_map_pe_dma_window(phb->opal_id, 2146 pe->pe_number, 2147 base + i, 1, 2148 __pa(addr) + tce32_segsz * i, 2149 tce32_segsz, IOMMU_PAGE_SIZE_4K); 2150 if (rc) { 2151 pe_err(pe, " Failed to configure 32-bit TCE table," 2152 " err %ld\n", rc); 2153 goto fail; 2154 } 2155 } 2156 2157 /* Setup DMA32 segment mapping */ 2158 for (i = base; i < base + segs; i++) 2159 phb->ioda.dma32_segmap[i] = pe->pe_number; 2160 2161 /* Setup linux iommu table */ 2162 pnv_pci_setup_iommu_table(tbl, addr, tce32_segsz * segs, 2163 base * PNV_IODA1_DMA32_SEGSIZE, 2164 IOMMU_PAGE_SHIFT_4K); 2165 2166 tbl->it_ops = &pnv_ioda1_iommu_ops; 2167 pe->table_group.tce32_start = tbl->it_offset << tbl->it_page_shift; 2168 pe->table_group.tce32_size = tbl->it_size << tbl->it_page_shift; 2169 iommu_init_table(tbl, phb->hose->node); 2170 2171 if (pe->flags & PNV_IODA_PE_DEV) { 2172 /* 2173 * Setting table base here only for carrying iommu_group 2174 * further down to let iommu_add_device() do the job. 2175 * pnv_pci_ioda_dma_dev_setup will override it later anyway. 2176 */ 2177 set_iommu_table_base(&pe->pdev->dev, tbl); 2178 iommu_add_device(&pe->pdev->dev); 2179 } else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)) 2180 pnv_ioda_setup_bus_dma(pe, pe->pbus); 2181 2182 return; 2183 fail: 2184 /* XXX Failure: Try to fallback to 64-bit only ? */ 2185 if (tce_mem) 2186 __free_pages(tce_mem, get_order(tce32_segsz * segs)); 2187 if (tbl) { 2188 pnv_pci_unlink_table_and_group(tbl, &pe->table_group); 2189 iommu_free_table(tbl, "pnv"); 2190 } 2191 } 2192 2193 static long pnv_pci_ioda2_set_window(struct iommu_table_group *table_group, 2194 int num, struct iommu_table *tbl) 2195 { 2196 struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe, 2197 table_group); 2198 struct pnv_phb *phb = pe->phb; 2199 int64_t rc; 2200 const unsigned long size = tbl->it_indirect_levels ? 2201 tbl->it_level_size : tbl->it_size; 2202 const __u64 start_addr = tbl->it_offset << tbl->it_page_shift; 2203 const __u64 win_size = tbl->it_size << tbl->it_page_shift; 2204 2205 pe_info(pe, "Setting up window#%d %llx..%llx pg=%x\n", num, 2206 start_addr, start_addr + win_size - 1, 2207 IOMMU_PAGE_SIZE(tbl)); 2208 2209 /* 2210 * Map TCE table through TVT. The TVE index is the PE number 2211 * shifted by 1 bit for 32-bits DMA space. 2212 */ 2213 rc = opal_pci_map_pe_dma_window(phb->opal_id, 2214 pe->pe_number, 2215 (pe->pe_number << 1) + num, 2216 tbl->it_indirect_levels + 1, 2217 __pa(tbl->it_base), 2218 size << 3, 2219 IOMMU_PAGE_SIZE(tbl)); 2220 if (rc) { 2221 pe_err(pe, "Failed to configure TCE table, err %ld\n", rc); 2222 return rc; 2223 } 2224 2225 pnv_pci_link_table_and_group(phb->hose->node, num, 2226 tbl, &pe->table_group); 2227 pnv_pci_ioda2_tce_invalidate_pe(pe); 2228 2229 return 0; 2230 } 2231 2232 static void pnv_pci_ioda2_set_bypass(struct pnv_ioda_pe *pe, bool enable) 2233 { 2234 uint16_t window_id = (pe->pe_number << 1 ) + 1; 2235 int64_t rc; 2236 2237 pe_info(pe, "%sabling 64-bit DMA bypass\n", enable ? "En" : "Dis"); 2238 if (enable) { 2239 phys_addr_t top = memblock_end_of_DRAM(); 2240 2241 top = roundup_pow_of_two(top); 2242 rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id, 2243 pe->pe_number, 2244 window_id, 2245 pe->tce_bypass_base, 2246 top); 2247 } else { 2248 rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id, 2249 pe->pe_number, 2250 window_id, 2251 pe->tce_bypass_base, 2252 0); 2253 } 2254 if (rc) 2255 pe_err(pe, "OPAL error %lld configuring bypass window\n", rc); 2256 else 2257 pe->tce_bypass_enabled = enable; 2258 } 2259 2260 static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset, 2261 __u32 page_shift, __u64 window_size, __u32 levels, 2262 struct iommu_table *tbl); 2263 2264 static long pnv_pci_ioda2_create_table(struct iommu_table_group *table_group, 2265 int num, __u32 page_shift, __u64 window_size, __u32 levels, 2266 struct iommu_table **ptbl) 2267 { 2268 struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe, 2269 table_group); 2270 int nid = pe->phb->hose->node; 2271 __u64 bus_offset = num ? pe->tce_bypass_base : table_group->tce32_start; 2272 long ret; 2273 struct iommu_table *tbl; 2274 2275 tbl = pnv_pci_table_alloc(nid); 2276 if (!tbl) 2277 return -ENOMEM; 2278 2279 ret = pnv_pci_ioda2_table_alloc_pages(nid, 2280 bus_offset, page_shift, window_size, 2281 levels, tbl); 2282 if (ret) { 2283 iommu_free_table(tbl, "pnv"); 2284 return ret; 2285 } 2286 2287 tbl->it_ops = &pnv_ioda2_iommu_ops; 2288 2289 *ptbl = tbl; 2290 2291 return 0; 2292 } 2293 2294 static long pnv_pci_ioda2_setup_default_config(struct pnv_ioda_pe *pe) 2295 { 2296 struct iommu_table *tbl = NULL; 2297 long rc; 2298 2299 /* 2300 * crashkernel= specifies the kdump kernel's maximum memory at 2301 * some offset and there is no guaranteed the result is a power 2302 * of 2, which will cause errors later. 2303 */ 2304 const u64 max_memory = __rounddown_pow_of_two(memory_hotplug_max()); 2305 2306 /* 2307 * In memory constrained environments, e.g. kdump kernel, the 2308 * DMA window can be larger than available memory, which will 2309 * cause errors later. 2310 */ 2311 const u64 window_size = min((u64)pe->table_group.tce32_size, max_memory); 2312 2313 rc = pnv_pci_ioda2_create_table(&pe->table_group, 0, 2314 IOMMU_PAGE_SHIFT_4K, 2315 window_size, 2316 POWERNV_IOMMU_DEFAULT_LEVELS, &tbl); 2317 if (rc) { 2318 pe_err(pe, "Failed to create 32-bit TCE table, err %ld", 2319 rc); 2320 return rc; 2321 } 2322 2323 iommu_init_table(tbl, pe->phb->hose->node); 2324 2325 rc = pnv_pci_ioda2_set_window(&pe->table_group, 0, tbl); 2326 if (rc) { 2327 pe_err(pe, "Failed to configure 32-bit TCE table, err %ld\n", 2328 rc); 2329 pnv_ioda2_table_free(tbl); 2330 return rc; 2331 } 2332 2333 if (!pnv_iommu_bypass_disabled) 2334 pnv_pci_ioda2_set_bypass(pe, true); 2335 2336 /* 2337 * Setting table base here only for carrying iommu_group 2338 * further down to let iommu_add_device() do the job. 2339 * pnv_pci_ioda_dma_dev_setup will override it later anyway. 2340 */ 2341 if (pe->flags & PNV_IODA_PE_DEV) 2342 set_iommu_table_base(&pe->pdev->dev, tbl); 2343 2344 return 0; 2345 } 2346 2347 #if defined(CONFIG_IOMMU_API) || defined(CONFIG_PCI_IOV) 2348 static long pnv_pci_ioda2_unset_window(struct iommu_table_group *table_group, 2349 int num) 2350 { 2351 struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe, 2352 table_group); 2353 struct pnv_phb *phb = pe->phb; 2354 long ret; 2355 2356 pe_info(pe, "Removing DMA window #%d\n", num); 2357 2358 ret = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number, 2359 (pe->pe_number << 1) + num, 2360 0/* levels */, 0/* table address */, 2361 0/* table size */, 0/* page size */); 2362 if (ret) 2363 pe_warn(pe, "Unmapping failed, ret = %ld\n", ret); 2364 else 2365 pnv_pci_ioda2_tce_invalidate_pe(pe); 2366 2367 pnv_pci_unlink_table_and_group(table_group->tables[num], table_group); 2368 2369 return ret; 2370 } 2371 #endif 2372 2373 #ifdef CONFIG_IOMMU_API 2374 static unsigned long pnv_pci_ioda2_get_table_size(__u32 page_shift, 2375 __u64 window_size, __u32 levels) 2376 { 2377 unsigned long bytes = 0; 2378 const unsigned window_shift = ilog2(window_size); 2379 unsigned entries_shift = window_shift - page_shift; 2380 unsigned table_shift = entries_shift + 3; 2381 unsigned long tce_table_size = max(0x1000UL, 1UL << table_shift); 2382 unsigned long direct_table_size; 2383 2384 if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS) || 2385 (window_size > memory_hotplug_max()) || 2386 !is_power_of_2(window_size)) 2387 return 0; 2388 2389 /* Calculate a direct table size from window_size and levels */ 2390 entries_shift = (entries_shift + levels - 1) / levels; 2391 table_shift = entries_shift + 3; 2392 table_shift = max_t(unsigned, table_shift, PAGE_SHIFT); 2393 direct_table_size = 1UL << table_shift; 2394 2395 for ( ; levels; --levels) { 2396 bytes += _ALIGN_UP(tce_table_size, direct_table_size); 2397 2398 tce_table_size /= direct_table_size; 2399 tce_table_size <<= 3; 2400 tce_table_size = _ALIGN_UP(tce_table_size, direct_table_size); 2401 } 2402 2403 return bytes; 2404 } 2405 2406 static void pnv_ioda2_take_ownership(struct iommu_table_group *table_group) 2407 { 2408 struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe, 2409 table_group); 2410 /* Store @tbl as pnv_pci_ioda2_unset_window() resets it */ 2411 struct iommu_table *tbl = pe->table_group.tables[0]; 2412 2413 pnv_pci_ioda2_set_bypass(pe, false); 2414 pnv_pci_ioda2_unset_window(&pe->table_group, 0); 2415 pnv_ioda2_table_free(tbl); 2416 } 2417 2418 static void pnv_ioda2_release_ownership(struct iommu_table_group *table_group) 2419 { 2420 struct pnv_ioda_pe *pe = container_of(table_group, struct pnv_ioda_pe, 2421 table_group); 2422 2423 pnv_pci_ioda2_setup_default_config(pe); 2424 } 2425 2426 static struct iommu_table_group_ops pnv_pci_ioda2_ops = { 2427 .get_table_size = pnv_pci_ioda2_get_table_size, 2428 .create_table = pnv_pci_ioda2_create_table, 2429 .set_window = pnv_pci_ioda2_set_window, 2430 .unset_window = pnv_pci_ioda2_unset_window, 2431 .take_ownership = pnv_ioda2_take_ownership, 2432 .release_ownership = pnv_ioda2_release_ownership, 2433 }; 2434 2435 static int gpe_table_group_to_npe_cb(struct device *dev, void *opaque) 2436 { 2437 struct pci_controller *hose; 2438 struct pnv_phb *phb; 2439 struct pnv_ioda_pe **ptmppe = opaque; 2440 struct pci_dev *pdev = container_of(dev, struct pci_dev, dev); 2441 struct pci_dn *pdn = pci_get_pdn(pdev); 2442 2443 if (!pdn || pdn->pe_number == IODA_INVALID_PE) 2444 return 0; 2445 2446 hose = pci_bus_to_host(pdev->bus); 2447 phb = hose->private_data; 2448 if (phb->type != PNV_PHB_NPU) 2449 return 0; 2450 2451 *ptmppe = &phb->ioda.pe_array[pdn->pe_number]; 2452 2453 return 1; 2454 } 2455 2456 /* 2457 * This returns PE of associated NPU. 2458 * This assumes that NPU is in the same IOMMU group with GPU and there is 2459 * no other PEs. 2460 */ 2461 static struct pnv_ioda_pe *gpe_table_group_to_npe( 2462 struct iommu_table_group *table_group) 2463 { 2464 struct pnv_ioda_pe *npe = NULL; 2465 int ret = iommu_group_for_each_dev(table_group->group, &npe, 2466 gpe_table_group_to_npe_cb); 2467 2468 BUG_ON(!ret || !npe); 2469 2470 return npe; 2471 } 2472 2473 static long pnv_pci_ioda2_npu_set_window(struct iommu_table_group *table_group, 2474 int num, struct iommu_table *tbl) 2475 { 2476 long ret = pnv_pci_ioda2_set_window(table_group, num, tbl); 2477 2478 if (ret) 2479 return ret; 2480 2481 ret = pnv_npu_set_window(gpe_table_group_to_npe(table_group), num, tbl); 2482 if (ret) 2483 pnv_pci_ioda2_unset_window(table_group, num); 2484 2485 return ret; 2486 } 2487 2488 static long pnv_pci_ioda2_npu_unset_window( 2489 struct iommu_table_group *table_group, 2490 int num) 2491 { 2492 long ret = pnv_pci_ioda2_unset_window(table_group, num); 2493 2494 if (ret) 2495 return ret; 2496 2497 return pnv_npu_unset_window(gpe_table_group_to_npe(table_group), num); 2498 } 2499 2500 static void pnv_ioda2_npu_take_ownership(struct iommu_table_group *table_group) 2501 { 2502 /* 2503 * Detach NPU first as pnv_ioda2_take_ownership() will destroy 2504 * the iommu_table if 32bit DMA is enabled. 2505 */ 2506 pnv_npu_take_ownership(gpe_table_group_to_npe(table_group)); 2507 pnv_ioda2_take_ownership(table_group); 2508 } 2509 2510 static struct iommu_table_group_ops pnv_pci_ioda2_npu_ops = { 2511 .get_table_size = pnv_pci_ioda2_get_table_size, 2512 .create_table = pnv_pci_ioda2_create_table, 2513 .set_window = pnv_pci_ioda2_npu_set_window, 2514 .unset_window = pnv_pci_ioda2_npu_unset_window, 2515 .take_ownership = pnv_ioda2_npu_take_ownership, 2516 .release_ownership = pnv_ioda2_release_ownership, 2517 }; 2518 2519 static void pnv_pci_ioda_setup_iommu_api(void) 2520 { 2521 struct pci_controller *hose, *tmp; 2522 struct pnv_phb *phb; 2523 struct pnv_ioda_pe *pe, *gpe; 2524 2525 /* 2526 * Now we have all PHBs discovered, time to add NPU devices to 2527 * the corresponding IOMMU groups. 2528 */ 2529 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 2530 phb = hose->private_data; 2531 2532 if (phb->type != PNV_PHB_NPU) 2533 continue; 2534 2535 list_for_each_entry(pe, &phb->ioda.pe_list, list) { 2536 gpe = pnv_pci_npu_setup_iommu(pe); 2537 if (gpe) 2538 gpe->table_group.ops = &pnv_pci_ioda2_npu_ops; 2539 } 2540 } 2541 } 2542 #else /* !CONFIG_IOMMU_API */ 2543 static void pnv_pci_ioda_setup_iommu_api(void) { }; 2544 #endif 2545 2546 static __be64 *pnv_pci_ioda2_table_do_alloc_pages(int nid, unsigned shift, 2547 unsigned levels, unsigned long limit, 2548 unsigned long *current_offset, unsigned long *total_allocated) 2549 { 2550 struct page *tce_mem = NULL; 2551 __be64 *addr, *tmp; 2552 unsigned order = max_t(unsigned, shift, PAGE_SHIFT) - PAGE_SHIFT; 2553 unsigned long allocated = 1UL << (order + PAGE_SHIFT); 2554 unsigned entries = 1UL << (shift - 3); 2555 long i; 2556 2557 tce_mem = alloc_pages_node(nid, GFP_KERNEL, order); 2558 if (!tce_mem) { 2559 pr_err("Failed to allocate a TCE memory, order=%d\n", order); 2560 return NULL; 2561 } 2562 addr = page_address(tce_mem); 2563 memset(addr, 0, allocated); 2564 *total_allocated += allocated; 2565 2566 --levels; 2567 if (!levels) { 2568 *current_offset += allocated; 2569 return addr; 2570 } 2571 2572 for (i = 0; i < entries; ++i) { 2573 tmp = pnv_pci_ioda2_table_do_alloc_pages(nid, shift, 2574 levels, limit, current_offset, total_allocated); 2575 if (!tmp) 2576 break; 2577 2578 addr[i] = cpu_to_be64(__pa(tmp) | 2579 TCE_PCI_READ | TCE_PCI_WRITE); 2580 2581 if (*current_offset >= limit) 2582 break; 2583 } 2584 2585 return addr; 2586 } 2587 2588 static void pnv_pci_ioda2_table_do_free_pages(__be64 *addr, 2589 unsigned long size, unsigned level); 2590 2591 static long pnv_pci_ioda2_table_alloc_pages(int nid, __u64 bus_offset, 2592 __u32 page_shift, __u64 window_size, __u32 levels, 2593 struct iommu_table *tbl) 2594 { 2595 void *addr; 2596 unsigned long offset = 0, level_shift, total_allocated = 0; 2597 const unsigned window_shift = ilog2(window_size); 2598 unsigned entries_shift = window_shift - page_shift; 2599 unsigned table_shift = max_t(unsigned, entries_shift + 3, PAGE_SHIFT); 2600 const unsigned long tce_table_size = 1UL << table_shift; 2601 2602 if (!levels || (levels > POWERNV_IOMMU_MAX_LEVELS)) 2603 return -EINVAL; 2604 2605 if ((window_size > memory_hotplug_max()) || !is_power_of_2(window_size)) 2606 return -EINVAL; 2607 2608 /* Adjust direct table size from window_size and levels */ 2609 entries_shift = (entries_shift + levels - 1) / levels; 2610 level_shift = entries_shift + 3; 2611 level_shift = max_t(unsigned, level_shift, PAGE_SHIFT); 2612 2613 /* Allocate TCE table */ 2614 addr = pnv_pci_ioda2_table_do_alloc_pages(nid, level_shift, 2615 levels, tce_table_size, &offset, &total_allocated); 2616 2617 /* addr==NULL means that the first level allocation failed */ 2618 if (!addr) 2619 return -ENOMEM; 2620 2621 /* 2622 * First level was allocated but some lower level failed as 2623 * we did not allocate as much as we wanted, 2624 * release partially allocated table. 2625 */ 2626 if (offset < tce_table_size) { 2627 pnv_pci_ioda2_table_do_free_pages(addr, 2628 1ULL << (level_shift - 3), levels - 1); 2629 return -ENOMEM; 2630 } 2631 2632 /* Setup linux iommu table */ 2633 pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, bus_offset, 2634 page_shift); 2635 tbl->it_level_size = 1ULL << (level_shift - 3); 2636 tbl->it_indirect_levels = levels - 1; 2637 tbl->it_allocated_size = total_allocated; 2638 2639 pr_devel("Created TCE table: ws=%08llx ts=%lx @%08llx\n", 2640 window_size, tce_table_size, bus_offset); 2641 2642 return 0; 2643 } 2644 2645 static void pnv_pci_ioda2_table_do_free_pages(__be64 *addr, 2646 unsigned long size, unsigned level) 2647 { 2648 const unsigned long addr_ul = (unsigned long) addr & 2649 ~(TCE_PCI_READ | TCE_PCI_WRITE); 2650 2651 if (level) { 2652 long i; 2653 u64 *tmp = (u64 *) addr_ul; 2654 2655 for (i = 0; i < size; ++i) { 2656 unsigned long hpa = be64_to_cpu(tmp[i]); 2657 2658 if (!(hpa & (TCE_PCI_READ | TCE_PCI_WRITE))) 2659 continue; 2660 2661 pnv_pci_ioda2_table_do_free_pages(__va(hpa), size, 2662 level - 1); 2663 } 2664 } 2665 2666 free_pages(addr_ul, get_order(size << 3)); 2667 } 2668 2669 static void pnv_pci_ioda2_table_free_pages(struct iommu_table *tbl) 2670 { 2671 const unsigned long size = tbl->it_indirect_levels ? 2672 tbl->it_level_size : tbl->it_size; 2673 2674 if (!tbl->it_size) 2675 return; 2676 2677 pnv_pci_ioda2_table_do_free_pages((__be64 *)tbl->it_base, size, 2678 tbl->it_indirect_levels); 2679 } 2680 2681 static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, 2682 struct pnv_ioda_pe *pe) 2683 { 2684 int64_t rc; 2685 2686 if (!pnv_pci_ioda_pe_dma_weight(pe)) 2687 return; 2688 2689 /* TVE #1 is selected by PCI address bit 59 */ 2690 pe->tce_bypass_base = 1ull << 59; 2691 2692 iommu_register_group(&pe->table_group, phb->hose->global_number, 2693 pe->pe_number); 2694 2695 /* The PE will reserve all possible 32-bits space */ 2696 pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n", 2697 phb->ioda.m32_pci_base); 2698 2699 /* Setup linux iommu table */ 2700 pe->table_group.tce32_start = 0; 2701 pe->table_group.tce32_size = phb->ioda.m32_pci_base; 2702 pe->table_group.max_dynamic_windows_supported = 2703 IOMMU_TABLE_GROUP_MAX_TABLES; 2704 pe->table_group.max_levels = POWERNV_IOMMU_MAX_LEVELS; 2705 pe->table_group.pgsizes = SZ_4K | SZ_64K | SZ_16M; 2706 #ifdef CONFIG_IOMMU_API 2707 pe->table_group.ops = &pnv_pci_ioda2_ops; 2708 #endif 2709 2710 rc = pnv_pci_ioda2_setup_default_config(pe); 2711 if (rc) 2712 return; 2713 2714 if (pe->flags & PNV_IODA_PE_DEV) 2715 iommu_add_device(&pe->pdev->dev); 2716 else if (pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)) 2717 pnv_ioda_setup_bus_dma(pe, pe->pbus); 2718 } 2719 2720 #ifdef CONFIG_PCI_MSI 2721 static void pnv_ioda2_msi_eoi(struct irq_data *d) 2722 { 2723 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); 2724 struct irq_chip *chip = irq_data_get_irq_chip(d); 2725 struct pnv_phb *phb = container_of(chip, struct pnv_phb, 2726 ioda.irq_chip); 2727 int64_t rc; 2728 2729 rc = opal_pci_msi_eoi(phb->opal_id, hw_irq); 2730 WARN_ON_ONCE(rc); 2731 2732 icp_native_eoi(d); 2733 } 2734 2735 2736 void pnv_set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq) 2737 { 2738 struct irq_data *idata; 2739 struct irq_chip *ichip; 2740 2741 /* The MSI EOI OPAL call is only needed on PHB3 */ 2742 if (phb->model != PNV_PHB_MODEL_PHB3) 2743 return; 2744 2745 if (!phb->ioda.irq_chip_init) { 2746 /* 2747 * First time we setup an MSI IRQ, we need to setup the 2748 * corresponding IRQ chip to route correctly. 2749 */ 2750 idata = irq_get_irq_data(virq); 2751 ichip = irq_data_get_irq_chip(idata); 2752 phb->ioda.irq_chip_init = 1; 2753 phb->ioda.irq_chip = *ichip; 2754 phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi; 2755 } 2756 irq_set_chip(virq, &phb->ioda.irq_chip); 2757 } 2758 2759 static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev, 2760 unsigned int hwirq, unsigned int virq, 2761 unsigned int is_64, struct msi_msg *msg) 2762 { 2763 struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev); 2764 unsigned int xive_num = hwirq - phb->msi_base; 2765 __be32 data; 2766 int rc; 2767 2768 /* No PE assigned ? bail out ... no MSI for you ! */ 2769 if (pe == NULL) 2770 return -ENXIO; 2771 2772 /* Check if we have an MVE */ 2773 if (pe->mve_number < 0) 2774 return -ENXIO; 2775 2776 /* Force 32-bit MSI on some broken devices */ 2777 if (dev->no_64bit_msi) 2778 is_64 = 0; 2779 2780 /* Assign XIVE to PE */ 2781 rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num); 2782 if (rc) { 2783 pr_warn("%s: OPAL error %d setting XIVE %d PE\n", 2784 pci_name(dev), rc, xive_num); 2785 return -EIO; 2786 } 2787 2788 if (is_64) { 2789 __be64 addr64; 2790 2791 rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1, 2792 &addr64, &data); 2793 if (rc) { 2794 pr_warn("%s: OPAL error %d getting 64-bit MSI data\n", 2795 pci_name(dev), rc); 2796 return -EIO; 2797 } 2798 msg->address_hi = be64_to_cpu(addr64) >> 32; 2799 msg->address_lo = be64_to_cpu(addr64) & 0xfffffffful; 2800 } else { 2801 __be32 addr32; 2802 2803 rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1, 2804 &addr32, &data); 2805 if (rc) { 2806 pr_warn("%s: OPAL error %d getting 32-bit MSI data\n", 2807 pci_name(dev), rc); 2808 return -EIO; 2809 } 2810 msg->address_hi = 0; 2811 msg->address_lo = be32_to_cpu(addr32); 2812 } 2813 msg->data = be32_to_cpu(data); 2814 2815 pnv_set_msi_irq_chip(phb, virq); 2816 2817 pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d)," 2818 " address=%x_%08x data=%x PE# %d\n", 2819 pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num, 2820 msg->address_hi, msg->address_lo, data, pe->pe_number); 2821 2822 return 0; 2823 } 2824 2825 static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) 2826 { 2827 unsigned int count; 2828 const __be32 *prop = of_get_property(phb->hose->dn, 2829 "ibm,opal-msi-ranges", NULL); 2830 if (!prop) { 2831 /* BML Fallback */ 2832 prop = of_get_property(phb->hose->dn, "msi-ranges", NULL); 2833 } 2834 if (!prop) 2835 return; 2836 2837 phb->msi_base = be32_to_cpup(prop); 2838 count = be32_to_cpup(prop + 1); 2839 if (msi_bitmap_alloc(&phb->msi_bmp, count, phb->hose->dn)) { 2840 pr_err("PCI %d: Failed to allocate MSI bitmap !\n", 2841 phb->hose->global_number); 2842 return; 2843 } 2844 2845 phb->msi_setup = pnv_pci_ioda_msi_setup; 2846 phb->msi32_support = 1; 2847 pr_info(" Allocated bitmap for %d MSIs (base IRQ 0x%x)\n", 2848 count, phb->msi_base); 2849 } 2850 #else 2851 static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { } 2852 #endif /* CONFIG_PCI_MSI */ 2853 2854 #ifdef CONFIG_PCI_IOV 2855 static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev) 2856 { 2857 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 2858 struct pnv_phb *phb = hose->private_data; 2859 const resource_size_t gate = phb->ioda.m64_segsize >> 2; 2860 struct resource *res; 2861 int i; 2862 resource_size_t size, total_vf_bar_sz; 2863 struct pci_dn *pdn; 2864 int mul, total_vfs; 2865 2866 if (!pdev->is_physfn || pdev->is_added) 2867 return; 2868 2869 pdn = pci_get_pdn(pdev); 2870 pdn->vfs_expanded = 0; 2871 pdn->m64_single_mode = false; 2872 2873 total_vfs = pci_sriov_get_totalvfs(pdev); 2874 mul = phb->ioda.total_pe_num; 2875 total_vf_bar_sz = 0; 2876 2877 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 2878 res = &pdev->resource[i + PCI_IOV_RESOURCES]; 2879 if (!res->flags || res->parent) 2880 continue; 2881 if (!pnv_pci_is_m64_flags(res->flags)) { 2882 dev_warn(&pdev->dev, "Don't support SR-IOV with" 2883 " non M64 VF BAR%d: %pR. \n", 2884 i, res); 2885 goto truncate_iov; 2886 } 2887 2888 total_vf_bar_sz += pci_iov_resource_size(pdev, 2889 i + PCI_IOV_RESOURCES); 2890 2891 /* 2892 * If bigger than quarter of M64 segment size, just round up 2893 * power of two. 2894 * 2895 * Generally, one M64 BAR maps one IOV BAR. To avoid conflict 2896 * with other devices, IOV BAR size is expanded to be 2897 * (total_pe * VF_BAR_size). When VF_BAR_size is half of M64 2898 * segment size , the expanded size would equal to half of the 2899 * whole M64 space size, which will exhaust the M64 Space and 2900 * limit the system flexibility. This is a design decision to 2901 * set the boundary to quarter of the M64 segment size. 2902 */ 2903 if (total_vf_bar_sz > gate) { 2904 mul = roundup_pow_of_two(total_vfs); 2905 dev_info(&pdev->dev, 2906 "VF BAR Total IOV size %llx > %llx, roundup to %d VFs\n", 2907 total_vf_bar_sz, gate, mul); 2908 pdn->m64_single_mode = true; 2909 break; 2910 } 2911 } 2912 2913 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 2914 res = &pdev->resource[i + PCI_IOV_RESOURCES]; 2915 if (!res->flags || res->parent) 2916 continue; 2917 2918 size = pci_iov_resource_size(pdev, i + PCI_IOV_RESOURCES); 2919 /* 2920 * On PHB3, the minimum size alignment of M64 BAR in single 2921 * mode is 32MB. 2922 */ 2923 if (pdn->m64_single_mode && (size < SZ_32M)) 2924 goto truncate_iov; 2925 dev_dbg(&pdev->dev, " Fixing VF BAR%d: %pR to\n", i, res); 2926 res->end = res->start + size * mul - 1; 2927 dev_dbg(&pdev->dev, " %pR\n", res); 2928 dev_info(&pdev->dev, "VF BAR%d: %pR (expanded to %d VFs for PE alignment)", 2929 i, res, mul); 2930 } 2931 pdn->vfs_expanded = mul; 2932 2933 return; 2934 2935 truncate_iov: 2936 /* To save MMIO space, IOV BAR is truncated. */ 2937 for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) { 2938 res = &pdev->resource[i + PCI_IOV_RESOURCES]; 2939 res->flags = 0; 2940 res->end = res->start - 1; 2941 } 2942 } 2943 #endif /* CONFIG_PCI_IOV */ 2944 2945 static void pnv_ioda_setup_pe_res(struct pnv_ioda_pe *pe, 2946 struct resource *res) 2947 { 2948 struct pnv_phb *phb = pe->phb; 2949 struct pci_bus_region region; 2950 int index; 2951 int64_t rc; 2952 2953 if (!res || !res->flags || res->start > res->end) 2954 return; 2955 2956 if (res->flags & IORESOURCE_IO) { 2957 region.start = res->start - phb->ioda.io_pci_base; 2958 region.end = res->end - phb->ioda.io_pci_base; 2959 index = region.start / phb->ioda.io_segsize; 2960 2961 while (index < phb->ioda.total_pe_num && 2962 region.start <= region.end) { 2963 phb->ioda.io_segmap[index] = pe->pe_number; 2964 rc = opal_pci_map_pe_mmio_window(phb->opal_id, 2965 pe->pe_number, OPAL_IO_WINDOW_TYPE, 0, index); 2966 if (rc != OPAL_SUCCESS) { 2967 pr_err("%s: Error %lld mapping IO segment#%d to PE#%d\n", 2968 __func__, rc, index, pe->pe_number); 2969 break; 2970 } 2971 2972 region.start += phb->ioda.io_segsize; 2973 index++; 2974 } 2975 } else if ((res->flags & IORESOURCE_MEM) && 2976 !pnv_pci_is_m64(phb, res)) { 2977 region.start = res->start - 2978 phb->hose->mem_offset[0] - 2979 phb->ioda.m32_pci_base; 2980 region.end = res->end - 2981 phb->hose->mem_offset[0] - 2982 phb->ioda.m32_pci_base; 2983 index = region.start / phb->ioda.m32_segsize; 2984 2985 while (index < phb->ioda.total_pe_num && 2986 region.start <= region.end) { 2987 phb->ioda.m32_segmap[index] = pe->pe_number; 2988 rc = opal_pci_map_pe_mmio_window(phb->opal_id, 2989 pe->pe_number, OPAL_M32_WINDOW_TYPE, 0, index); 2990 if (rc != OPAL_SUCCESS) { 2991 pr_err("%s: Error %lld mapping M32 segment#%d to PE#%d", 2992 __func__, rc, index, pe->pe_number); 2993 break; 2994 } 2995 2996 region.start += phb->ioda.m32_segsize; 2997 index++; 2998 } 2999 } 3000 } 3001 3002 /* 3003 * This function is supposed to be called on basis of PE from top 3004 * to bottom style. So the the I/O or MMIO segment assigned to 3005 * parent PE could be overrided by its child PEs if necessary. 3006 */ 3007 static void pnv_ioda_setup_pe_seg(struct pnv_ioda_pe *pe) 3008 { 3009 struct pci_dev *pdev; 3010 int i; 3011 3012 /* 3013 * NOTE: We only care PCI bus based PE for now. For PCI 3014 * device based PE, for example SRIOV sensitive VF should 3015 * be figured out later. 3016 */ 3017 BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL))); 3018 3019 list_for_each_entry(pdev, &pe->pbus->devices, bus_list) { 3020 for (i = 0; i <= PCI_ROM_RESOURCE; i++) 3021 pnv_ioda_setup_pe_res(pe, &pdev->resource[i]); 3022 3023 /* 3024 * If the PE contains all subordinate PCI buses, the 3025 * windows of the child bridges should be mapped to 3026 * the PE as well. 3027 */ 3028 if (!(pe->flags & PNV_IODA_PE_BUS_ALL) || !pci_is_bridge(pdev)) 3029 continue; 3030 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) 3031 pnv_ioda_setup_pe_res(pe, 3032 &pdev->resource[PCI_BRIDGE_RESOURCES + i]); 3033 } 3034 } 3035 3036 static void pnv_pci_ioda_create_dbgfs(void) 3037 { 3038 #ifdef CONFIG_DEBUG_FS 3039 struct pci_controller *hose, *tmp; 3040 struct pnv_phb *phb; 3041 char name[16]; 3042 3043 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) { 3044 phb = hose->private_data; 3045 3046 /* Notify initialization of PHB done */ 3047 phb->initialized = 1; 3048 3049 sprintf(name, "PCI%04x", hose->global_number); 3050 phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root); 3051 if (!phb->dbgfs) 3052 pr_warning("%s: Error on creating debugfs on PHB#%x\n", 3053 __func__, hose->global_number); 3054 } 3055 #endif /* CONFIG_DEBUG_FS */ 3056 } 3057 3058 static void pnv_pci_ioda_fixup(void) 3059 { 3060 pnv_pci_ioda_setup_PEs(); 3061 pnv_pci_ioda_setup_iommu_api(); 3062 pnv_pci_ioda_create_dbgfs(); 3063 3064 #ifdef CONFIG_EEH 3065 eeh_init(); 3066 eeh_addr_cache_build(); 3067 #endif 3068 } 3069 3070 /* 3071 * Returns the alignment for I/O or memory windows for P2P 3072 * bridges. That actually depends on how PEs are segmented. 3073 * For now, we return I/O or M32 segment size for PE sensitive 3074 * P2P bridges. Otherwise, the default values (4KiB for I/O, 3075 * 1MiB for memory) will be returned. 3076 * 3077 * The current PCI bus might be put into one PE, which was 3078 * create against the parent PCI bridge. For that case, we 3079 * needn't enlarge the alignment so that we can save some 3080 * resources. 3081 */ 3082 static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus, 3083 unsigned long type) 3084 { 3085 struct pci_dev *bridge; 3086 struct pci_controller *hose = pci_bus_to_host(bus); 3087 struct pnv_phb *phb = hose->private_data; 3088 int num_pci_bridges = 0; 3089 3090 bridge = bus->self; 3091 while (bridge) { 3092 if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) { 3093 num_pci_bridges++; 3094 if (num_pci_bridges >= 2) 3095 return 1; 3096 } 3097 3098 bridge = bridge->bus->self; 3099 } 3100 3101 /* 3102 * We fall back to M32 if M64 isn't supported. We enforce the M64 3103 * alignment for any 64-bit resource, PCIe doesn't care and 3104 * bridges only do 64-bit prefetchable anyway. 3105 */ 3106 if (phb->ioda.m64_segsize && pnv_pci_is_m64_flags(type)) 3107 return phb->ioda.m64_segsize; 3108 if (type & IORESOURCE_MEM) 3109 return phb->ioda.m32_segsize; 3110 3111 return phb->ioda.io_segsize; 3112 } 3113 3114 /* 3115 * We are updating root port or the upstream port of the 3116 * bridge behind the root port with PHB's windows in order 3117 * to accommodate the changes on required resources during 3118 * PCI (slot) hotplug, which is connected to either root 3119 * port or the downstream ports of PCIe switch behind the 3120 * root port. 3121 */ 3122 static void pnv_pci_fixup_bridge_resources(struct pci_bus *bus, 3123 unsigned long type) 3124 { 3125 struct pci_controller *hose = pci_bus_to_host(bus); 3126 struct pnv_phb *phb = hose->private_data; 3127 struct pci_dev *bridge = bus->self; 3128 struct resource *r, *w; 3129 bool msi_region = false; 3130 int i; 3131 3132 /* Check if we need apply fixup to the bridge's windows */ 3133 if (!pci_is_root_bus(bridge->bus) && 3134 !pci_is_root_bus(bridge->bus->self->bus)) 3135 return; 3136 3137 /* Fixup the resources */ 3138 for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) { 3139 r = &bridge->resource[PCI_BRIDGE_RESOURCES + i]; 3140 if (!r->flags || !r->parent) 3141 continue; 3142 3143 w = NULL; 3144 if (r->flags & type & IORESOURCE_IO) 3145 w = &hose->io_resource; 3146 else if (pnv_pci_is_m64(phb, r) && 3147 (type & IORESOURCE_PREFETCH) && 3148 phb->ioda.m64_segsize) 3149 w = &hose->mem_resources[1]; 3150 else if (r->flags & type & IORESOURCE_MEM) { 3151 w = &hose->mem_resources[0]; 3152 msi_region = true; 3153 } 3154 3155 r->start = w->start; 3156 r->end = w->end; 3157 3158 /* The 64KB 32-bits MSI region shouldn't be included in 3159 * the 32-bits bridge window. Otherwise, we can see strange 3160 * issues. One of them is EEH error observed on Garrison. 3161 * 3162 * Exclude top 1MB region which is the minimal alignment of 3163 * 32-bits bridge window. 3164 */ 3165 if (msi_region) { 3166 r->end += 0x10000; 3167 r->end -= 0x100000; 3168 } 3169 } 3170 } 3171 3172 static void pnv_pci_setup_bridge(struct pci_bus *bus, unsigned long type) 3173 { 3174 struct pci_controller *hose = pci_bus_to_host(bus); 3175 struct pnv_phb *phb = hose->private_data; 3176 struct pci_dev *bridge = bus->self; 3177 struct pnv_ioda_pe *pe; 3178 bool all = (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE); 3179 3180 /* Extend bridge's windows if necessary */ 3181 pnv_pci_fixup_bridge_resources(bus, type); 3182 3183 /* The PE for root bus should be realized before any one else */ 3184 if (!phb->ioda.root_pe_populated) { 3185 pe = pnv_ioda_setup_bus_PE(phb->hose->bus, false); 3186 if (pe) { 3187 phb->ioda.root_pe_idx = pe->pe_number; 3188 phb->ioda.root_pe_populated = true; 3189 } 3190 } 3191 3192 /* Don't assign PE to PCI bus, which doesn't have subordinate devices */ 3193 if (list_empty(&bus->devices)) 3194 return; 3195 3196 /* Reserve PEs according to used M64 resources */ 3197 if (phb->reserve_m64_pe) 3198 phb->reserve_m64_pe(bus, NULL, all); 3199 3200 /* 3201 * Assign PE. We might run here because of partial hotplug. 3202 * For the case, we just pick up the existing PE and should 3203 * not allocate resources again. 3204 */ 3205 pe = pnv_ioda_setup_bus_PE(bus, all); 3206 if (!pe) 3207 return; 3208 3209 pnv_ioda_setup_pe_seg(pe); 3210 switch (phb->type) { 3211 case PNV_PHB_IODA1: 3212 pnv_pci_ioda1_setup_dma_pe(phb, pe); 3213 break; 3214 case PNV_PHB_IODA2: 3215 pnv_pci_ioda2_setup_dma_pe(phb, pe); 3216 break; 3217 default: 3218 pr_warn("%s: No DMA for PHB#%d (type %d)\n", 3219 __func__, phb->hose->global_number, phb->type); 3220 } 3221 } 3222 3223 #ifdef CONFIG_PCI_IOV 3224 static resource_size_t pnv_pci_iov_resource_alignment(struct pci_dev *pdev, 3225 int resno) 3226 { 3227 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 3228 struct pnv_phb *phb = hose->private_data; 3229 struct pci_dn *pdn = pci_get_pdn(pdev); 3230 resource_size_t align; 3231 3232 /* 3233 * On PowerNV platform, IOV BAR is mapped by M64 BAR to enable the 3234 * SR-IOV. While from hardware perspective, the range mapped by M64 3235 * BAR should be size aligned. 3236 * 3237 * When IOV BAR is mapped with M64 BAR in Single PE mode, the extra 3238 * powernv-specific hardware restriction is gone. But if just use the 3239 * VF BAR size as the alignment, PF BAR / VF BAR may be allocated with 3240 * in one segment of M64 #15, which introduces the PE conflict between 3241 * PF and VF. Based on this, the minimum alignment of an IOV BAR is 3242 * m64_segsize. 3243 * 3244 * This function returns the total IOV BAR size if M64 BAR is in 3245 * Shared PE mode or just VF BAR size if not. 3246 * If the M64 BAR is in Single PE mode, return the VF BAR size or 3247 * M64 segment size if IOV BAR size is less. 3248 */ 3249 align = pci_iov_resource_size(pdev, resno); 3250 if (!pdn->vfs_expanded) 3251 return align; 3252 if (pdn->m64_single_mode) 3253 return max(align, (resource_size_t)phb->ioda.m64_segsize); 3254 3255 return pdn->vfs_expanded * align; 3256 } 3257 #endif /* CONFIG_PCI_IOV */ 3258 3259 /* Prevent enabling devices for which we couldn't properly 3260 * assign a PE 3261 */ 3262 bool pnv_pci_enable_device_hook(struct pci_dev *dev) 3263 { 3264 struct pci_controller *hose = pci_bus_to_host(dev->bus); 3265 struct pnv_phb *phb = hose->private_data; 3266 struct pci_dn *pdn; 3267 3268 /* The function is probably called while the PEs have 3269 * not be created yet. For example, resource reassignment 3270 * during PCI probe period. We just skip the check if 3271 * PEs isn't ready. 3272 */ 3273 if (!phb->initialized) 3274 return true; 3275 3276 pdn = pci_get_pdn(dev); 3277 if (!pdn || pdn->pe_number == IODA_INVALID_PE) 3278 return false; 3279 3280 return true; 3281 } 3282 3283 static long pnv_pci_ioda1_unset_window(struct iommu_table_group *table_group, 3284 int num) 3285 { 3286 struct pnv_ioda_pe *pe = container_of(table_group, 3287 struct pnv_ioda_pe, table_group); 3288 struct pnv_phb *phb = pe->phb; 3289 unsigned int idx; 3290 long rc; 3291 3292 pe_info(pe, "Removing DMA window #%d\n", num); 3293 for (idx = 0; idx < phb->ioda.dma32_count; idx++) { 3294 if (phb->ioda.dma32_segmap[idx] != pe->pe_number) 3295 continue; 3296 3297 rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number, 3298 idx, 0, 0ul, 0ul, 0ul); 3299 if (rc != OPAL_SUCCESS) { 3300 pe_warn(pe, "Failure %ld unmapping DMA32 segment#%d\n", 3301 rc, idx); 3302 return rc; 3303 } 3304 3305 phb->ioda.dma32_segmap[idx] = IODA_INVALID_PE; 3306 } 3307 3308 pnv_pci_unlink_table_and_group(table_group->tables[num], table_group); 3309 return OPAL_SUCCESS; 3310 } 3311 3312 static void pnv_pci_ioda1_release_pe_dma(struct pnv_ioda_pe *pe) 3313 { 3314 unsigned int weight = pnv_pci_ioda_pe_dma_weight(pe); 3315 struct iommu_table *tbl = pe->table_group.tables[0]; 3316 int64_t rc; 3317 3318 if (!weight) 3319 return; 3320 3321 rc = pnv_pci_ioda1_unset_window(&pe->table_group, 0); 3322 if (rc != OPAL_SUCCESS) 3323 return; 3324 3325 pnv_pci_p7ioc_tce_invalidate(tbl, tbl->it_offset, tbl->it_size, false); 3326 if (pe->table_group.group) { 3327 iommu_group_put(pe->table_group.group); 3328 WARN_ON(pe->table_group.group); 3329 } 3330 3331 free_pages(tbl->it_base, get_order(tbl->it_size << 3)); 3332 iommu_free_table(tbl, "pnv"); 3333 } 3334 3335 static void pnv_pci_ioda2_release_pe_dma(struct pnv_ioda_pe *pe) 3336 { 3337 struct iommu_table *tbl = pe->table_group.tables[0]; 3338 unsigned int weight = pnv_pci_ioda_pe_dma_weight(pe); 3339 #ifdef CONFIG_IOMMU_API 3340 int64_t rc; 3341 #endif 3342 3343 if (!weight) 3344 return; 3345 3346 #ifdef CONFIG_IOMMU_API 3347 rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0); 3348 if (rc) 3349 pe_warn(pe, "OPAL error %ld release DMA window\n", rc); 3350 #endif 3351 3352 pnv_pci_ioda2_set_bypass(pe, false); 3353 if (pe->table_group.group) { 3354 iommu_group_put(pe->table_group.group); 3355 WARN_ON(pe->table_group.group); 3356 } 3357 3358 pnv_pci_ioda2_table_free_pages(tbl); 3359 iommu_free_table(tbl, "pnv"); 3360 } 3361 3362 static void pnv_ioda_free_pe_seg(struct pnv_ioda_pe *pe, 3363 unsigned short win, 3364 unsigned int *map) 3365 { 3366 struct pnv_phb *phb = pe->phb; 3367 int idx; 3368 int64_t rc; 3369 3370 for (idx = 0; idx < phb->ioda.total_pe_num; idx++) { 3371 if (map[idx] != pe->pe_number) 3372 continue; 3373 3374 if (win == OPAL_M64_WINDOW_TYPE) 3375 rc = opal_pci_map_pe_mmio_window(phb->opal_id, 3376 phb->ioda.reserved_pe_idx, win, 3377 idx / PNV_IODA1_M64_SEGS, 3378 idx % PNV_IODA1_M64_SEGS); 3379 else 3380 rc = opal_pci_map_pe_mmio_window(phb->opal_id, 3381 phb->ioda.reserved_pe_idx, win, 0, idx); 3382 3383 if (rc != OPAL_SUCCESS) 3384 pe_warn(pe, "Error %ld unmapping (%d) segment#%d\n", 3385 rc, win, idx); 3386 3387 map[idx] = IODA_INVALID_PE; 3388 } 3389 } 3390 3391 static void pnv_ioda_release_pe_seg(struct pnv_ioda_pe *pe) 3392 { 3393 struct pnv_phb *phb = pe->phb; 3394 3395 if (phb->type == PNV_PHB_IODA1) { 3396 pnv_ioda_free_pe_seg(pe, OPAL_IO_WINDOW_TYPE, 3397 phb->ioda.io_segmap); 3398 pnv_ioda_free_pe_seg(pe, OPAL_M32_WINDOW_TYPE, 3399 phb->ioda.m32_segmap); 3400 pnv_ioda_free_pe_seg(pe, OPAL_M64_WINDOW_TYPE, 3401 phb->ioda.m64_segmap); 3402 } else if (phb->type == PNV_PHB_IODA2) { 3403 pnv_ioda_free_pe_seg(pe, OPAL_M32_WINDOW_TYPE, 3404 phb->ioda.m32_segmap); 3405 } 3406 } 3407 3408 static void pnv_ioda_release_pe(struct pnv_ioda_pe *pe) 3409 { 3410 struct pnv_phb *phb = pe->phb; 3411 struct pnv_ioda_pe *slave, *tmp; 3412 3413 list_del(&pe->list); 3414 switch (phb->type) { 3415 case PNV_PHB_IODA1: 3416 pnv_pci_ioda1_release_pe_dma(pe); 3417 break; 3418 case PNV_PHB_IODA2: 3419 pnv_pci_ioda2_release_pe_dma(pe); 3420 break; 3421 default: 3422 WARN_ON(1); 3423 } 3424 3425 pnv_ioda_release_pe_seg(pe); 3426 pnv_ioda_deconfigure_pe(pe->phb, pe); 3427 3428 /* Release slave PEs in the compound PE */ 3429 if (pe->flags & PNV_IODA_PE_MASTER) { 3430 list_for_each_entry_safe(slave, tmp, &pe->slaves, list) { 3431 list_del(&slave->list); 3432 pnv_ioda_free_pe(slave); 3433 } 3434 } 3435 3436 /* 3437 * The PE for root bus can be removed because of hotplug in EEH 3438 * recovery for fenced PHB error. We need to mark the PE dead so 3439 * that it can be populated again in PCI hot add path. The PE 3440 * shouldn't be destroyed as it's the global reserved resource. 3441 */ 3442 if (phb->ioda.root_pe_populated && 3443 phb->ioda.root_pe_idx == pe->pe_number) 3444 phb->ioda.root_pe_populated = false; 3445 else 3446 pnv_ioda_free_pe(pe); 3447 } 3448 3449 static void pnv_pci_release_device(struct pci_dev *pdev) 3450 { 3451 struct pci_controller *hose = pci_bus_to_host(pdev->bus); 3452 struct pnv_phb *phb = hose->private_data; 3453 struct pci_dn *pdn = pci_get_pdn(pdev); 3454 struct pnv_ioda_pe *pe; 3455 3456 if (pdev->is_virtfn) 3457 return; 3458 3459 if (!pdn || pdn->pe_number == IODA_INVALID_PE) 3460 return; 3461 3462 /* 3463 * PCI hotplug can happen as part of EEH error recovery. The @pdn 3464 * isn't removed and added afterwards in this scenario. We should 3465 * set the PE number in @pdn to an invalid one. Otherwise, the PE's 3466 * device count is decreased on removing devices while failing to 3467 * be increased on adding devices. It leads to unbalanced PE's device 3468 * count and eventually make normal PCI hotplug path broken. 3469 */ 3470 pe = &phb->ioda.pe_array[pdn->pe_number]; 3471 pdn->pe_number = IODA_INVALID_PE; 3472 3473 WARN_ON(--pe->device_count < 0); 3474 if (pe->device_count == 0) 3475 pnv_ioda_release_pe(pe); 3476 } 3477 3478 static void pnv_pci_ioda_shutdown(struct pci_controller *hose) 3479 { 3480 struct pnv_phb *phb = hose->private_data; 3481 3482 opal_pci_reset(phb->opal_id, OPAL_RESET_PCI_IODA_TABLE, 3483 OPAL_ASSERT_RESET); 3484 } 3485 3486 static const struct pci_controller_ops pnv_pci_ioda_controller_ops = { 3487 .dma_dev_setup = pnv_pci_dma_dev_setup, 3488 .dma_bus_setup = pnv_pci_dma_bus_setup, 3489 #ifdef CONFIG_PCI_MSI 3490 .setup_msi_irqs = pnv_setup_msi_irqs, 3491 .teardown_msi_irqs = pnv_teardown_msi_irqs, 3492 #endif 3493 .enable_device_hook = pnv_pci_enable_device_hook, 3494 .release_device = pnv_pci_release_device, 3495 .window_alignment = pnv_pci_window_alignment, 3496 .setup_bridge = pnv_pci_setup_bridge, 3497 .reset_secondary_bus = pnv_pci_reset_secondary_bus, 3498 .dma_set_mask = pnv_pci_ioda_dma_set_mask, 3499 .dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask, 3500 .shutdown = pnv_pci_ioda_shutdown, 3501 }; 3502 3503 static int pnv_npu_dma_set_mask(struct pci_dev *npdev, u64 dma_mask) 3504 { 3505 dev_err_once(&npdev->dev, 3506 "%s operation unsupported for NVLink devices\n", 3507 __func__); 3508 return -EPERM; 3509 } 3510 3511 static const struct pci_controller_ops pnv_npu_ioda_controller_ops = { 3512 .dma_dev_setup = pnv_pci_dma_dev_setup, 3513 #ifdef CONFIG_PCI_MSI 3514 .setup_msi_irqs = pnv_setup_msi_irqs, 3515 .teardown_msi_irqs = pnv_teardown_msi_irqs, 3516 #endif 3517 .enable_device_hook = pnv_pci_enable_device_hook, 3518 .window_alignment = pnv_pci_window_alignment, 3519 .reset_secondary_bus = pnv_pci_reset_secondary_bus, 3520 .dma_set_mask = pnv_npu_dma_set_mask, 3521 .shutdown = pnv_pci_ioda_shutdown, 3522 }; 3523 3524 #ifdef CONFIG_CXL_BASE 3525 const struct pci_controller_ops pnv_cxl_cx4_ioda_controller_ops = { 3526 .dma_dev_setup = pnv_pci_dma_dev_setup, 3527 .dma_bus_setup = pnv_pci_dma_bus_setup, 3528 #ifdef CONFIG_PCI_MSI 3529 .setup_msi_irqs = pnv_cxl_cx4_setup_msi_irqs, 3530 .teardown_msi_irqs = pnv_cxl_cx4_teardown_msi_irqs, 3531 #endif 3532 .enable_device_hook = pnv_cxl_enable_device_hook, 3533 .disable_device = pnv_cxl_disable_device, 3534 .release_device = pnv_pci_release_device, 3535 .window_alignment = pnv_pci_window_alignment, 3536 .setup_bridge = pnv_pci_setup_bridge, 3537 .reset_secondary_bus = pnv_pci_reset_secondary_bus, 3538 .dma_set_mask = pnv_pci_ioda_dma_set_mask, 3539 .dma_get_required_mask = pnv_pci_ioda_dma_get_required_mask, 3540 .shutdown = pnv_pci_ioda_shutdown, 3541 }; 3542 #endif 3543 3544 static void __init pnv_pci_init_ioda_phb(struct device_node *np, 3545 u64 hub_id, int ioda_type) 3546 { 3547 struct pci_controller *hose; 3548 struct pnv_phb *phb; 3549 unsigned long size, m64map_off, m32map_off, pemap_off; 3550 unsigned long iomap_off = 0, dma32map_off = 0; 3551 struct resource r; 3552 const __be64 *prop64; 3553 const __be32 *prop32; 3554 int len; 3555 unsigned int segno; 3556 u64 phb_id; 3557 void *aux; 3558 long rc; 3559 3560 if (!of_device_is_available(np)) 3561 return; 3562 3563 pr_info("Initializing %s PHB (%s)\n", 3564 pnv_phb_names[ioda_type], of_node_full_name(np)); 3565 3566 prop64 = of_get_property(np, "ibm,opal-phbid", NULL); 3567 if (!prop64) { 3568 pr_err(" Missing \"ibm,opal-phbid\" property !\n"); 3569 return; 3570 } 3571 phb_id = be64_to_cpup(prop64); 3572 pr_debug(" PHB-ID : 0x%016llx\n", phb_id); 3573 3574 phb = memblock_virt_alloc(sizeof(struct pnv_phb), 0); 3575 3576 /* Allocate PCI controller */ 3577 phb->hose = hose = pcibios_alloc_controller(np); 3578 if (!phb->hose) { 3579 pr_err(" Can't allocate PCI controller for %s\n", 3580 np->full_name); 3581 memblock_free(__pa(phb), sizeof(struct pnv_phb)); 3582 return; 3583 } 3584 3585 spin_lock_init(&phb->lock); 3586 prop32 = of_get_property(np, "bus-range", &len); 3587 if (prop32 && len == 8) { 3588 hose->first_busno = be32_to_cpu(prop32[0]); 3589 hose->last_busno = be32_to_cpu(prop32[1]); 3590 } else { 3591 pr_warn(" Broken <bus-range> on %s\n", np->full_name); 3592 hose->first_busno = 0; 3593 hose->last_busno = 0xff; 3594 } 3595 hose->private_data = phb; 3596 phb->hub_id = hub_id; 3597 phb->opal_id = phb_id; 3598 phb->type = ioda_type; 3599 mutex_init(&phb->ioda.pe_alloc_mutex); 3600 3601 /* Detect specific models for error handling */ 3602 if (of_device_is_compatible(np, "ibm,p7ioc-pciex")) 3603 phb->model = PNV_PHB_MODEL_P7IOC; 3604 else if (of_device_is_compatible(np, "ibm,power8-pciex")) 3605 phb->model = PNV_PHB_MODEL_PHB3; 3606 else if (of_device_is_compatible(np, "ibm,power8-npu-pciex")) 3607 phb->model = PNV_PHB_MODEL_NPU; 3608 else 3609 phb->model = PNV_PHB_MODEL_UNKNOWN; 3610 3611 /* Parse 32-bit and IO ranges (if any) */ 3612 pci_process_bridge_OF_ranges(hose, np, !hose->global_number); 3613 3614 /* Get registers */ 3615 if (!of_address_to_resource(np, 0, &r)) { 3616 phb->regs_phys = r.start; 3617 phb->regs = ioremap(r.start, resource_size(&r)); 3618 if (phb->regs == NULL) 3619 pr_err(" Failed to map registers !\n"); 3620 } 3621 3622 /* Initialize more IODA stuff */ 3623 phb->ioda.total_pe_num = 1; 3624 prop32 = of_get_property(np, "ibm,opal-num-pes", NULL); 3625 if (prop32) 3626 phb->ioda.total_pe_num = be32_to_cpup(prop32); 3627 prop32 = of_get_property(np, "ibm,opal-reserved-pe", NULL); 3628 if (prop32) 3629 phb->ioda.reserved_pe_idx = be32_to_cpup(prop32); 3630 3631 /* Invalidate RID to PE# mapping */ 3632 for (segno = 0; segno < ARRAY_SIZE(phb->ioda.pe_rmap); segno++) 3633 phb->ioda.pe_rmap[segno] = IODA_INVALID_PE; 3634 3635 /* Parse 64-bit MMIO range */ 3636 pnv_ioda_parse_m64_window(phb); 3637 3638 phb->ioda.m32_size = resource_size(&hose->mem_resources[0]); 3639 /* FW Has already off top 64k of M32 space (MSI space) */ 3640 phb->ioda.m32_size += 0x10000; 3641 3642 phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe_num; 3643 phb->ioda.m32_pci_base = hose->mem_resources[0].start - hose->mem_offset[0]; 3644 phb->ioda.io_size = hose->pci_io_size; 3645 phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe_num; 3646 phb->ioda.io_pci_base = 0; /* XXX calculate this ? */ 3647 3648 /* Calculate how many 32-bit TCE segments we have */ 3649 phb->ioda.dma32_count = phb->ioda.m32_pci_base / 3650 PNV_IODA1_DMA32_SEGSIZE; 3651 3652 /* Allocate aux data & arrays. We don't have IO ports on PHB3 */ 3653 size = _ALIGN_UP(max_t(unsigned, phb->ioda.total_pe_num, 8) / 8, 3654 sizeof(unsigned long)); 3655 m64map_off = size; 3656 size += phb->ioda.total_pe_num * sizeof(phb->ioda.m64_segmap[0]); 3657 m32map_off = size; 3658 size += phb->ioda.total_pe_num * sizeof(phb->ioda.m32_segmap[0]); 3659 if (phb->type == PNV_PHB_IODA1) { 3660 iomap_off = size; 3661 size += phb->ioda.total_pe_num * sizeof(phb->ioda.io_segmap[0]); 3662 dma32map_off = size; 3663 size += phb->ioda.dma32_count * 3664 sizeof(phb->ioda.dma32_segmap[0]); 3665 } 3666 pemap_off = size; 3667 size += phb->ioda.total_pe_num * sizeof(struct pnv_ioda_pe); 3668 aux = memblock_virt_alloc(size, 0); 3669 phb->ioda.pe_alloc = aux; 3670 phb->ioda.m64_segmap = aux + m64map_off; 3671 phb->ioda.m32_segmap = aux + m32map_off; 3672 for (segno = 0; segno < phb->ioda.total_pe_num; segno++) { 3673 phb->ioda.m64_segmap[segno] = IODA_INVALID_PE; 3674 phb->ioda.m32_segmap[segno] = IODA_INVALID_PE; 3675 } 3676 if (phb->type == PNV_PHB_IODA1) { 3677 phb->ioda.io_segmap = aux + iomap_off; 3678 for (segno = 0; segno < phb->ioda.total_pe_num; segno++) 3679 phb->ioda.io_segmap[segno] = IODA_INVALID_PE; 3680 3681 phb->ioda.dma32_segmap = aux + dma32map_off; 3682 for (segno = 0; segno < phb->ioda.dma32_count; segno++) 3683 phb->ioda.dma32_segmap[segno] = IODA_INVALID_PE; 3684 } 3685 phb->ioda.pe_array = aux + pemap_off; 3686 3687 /* 3688 * Choose PE number for root bus, which shouldn't have 3689 * M64 resources consumed by its child devices. To pick 3690 * the PE number adjacent to the reserved one if possible. 3691 */ 3692 pnv_ioda_reserve_pe(phb, phb->ioda.reserved_pe_idx); 3693 if (phb->ioda.reserved_pe_idx == 0) { 3694 phb->ioda.root_pe_idx = 1; 3695 pnv_ioda_reserve_pe(phb, phb->ioda.root_pe_idx); 3696 } else if (phb->ioda.reserved_pe_idx == (phb->ioda.total_pe_num - 1)) { 3697 phb->ioda.root_pe_idx = phb->ioda.reserved_pe_idx - 1; 3698 pnv_ioda_reserve_pe(phb, phb->ioda.root_pe_idx); 3699 } else { 3700 phb->ioda.root_pe_idx = IODA_INVALID_PE; 3701 } 3702 3703 INIT_LIST_HEAD(&phb->ioda.pe_list); 3704 mutex_init(&phb->ioda.pe_list_mutex); 3705 3706 /* Calculate how many 32-bit TCE segments we have */ 3707 phb->ioda.dma32_count = phb->ioda.m32_pci_base / 3708 PNV_IODA1_DMA32_SEGSIZE; 3709 3710 #if 0 /* We should really do that ... */ 3711 rc = opal_pci_set_phb_mem_window(opal->phb_id, 3712 window_type, 3713 window_num, 3714 starting_real_address, 3715 starting_pci_address, 3716 segment_size); 3717 #endif 3718 3719 pr_info(" %03d (%03d) PE's M32: 0x%x [segment=0x%x]\n", 3720 phb->ioda.total_pe_num, phb->ioda.reserved_pe_idx, 3721 phb->ioda.m32_size, phb->ioda.m32_segsize); 3722 if (phb->ioda.m64_size) 3723 pr_info(" M64: 0x%lx [segment=0x%lx]\n", 3724 phb->ioda.m64_size, phb->ioda.m64_segsize); 3725 if (phb->ioda.io_size) 3726 pr_info(" IO: 0x%x [segment=0x%x]\n", 3727 phb->ioda.io_size, phb->ioda.io_segsize); 3728 3729 3730 phb->hose->ops = &pnv_pci_ops; 3731 phb->get_pe_state = pnv_ioda_get_pe_state; 3732 phb->freeze_pe = pnv_ioda_freeze_pe; 3733 phb->unfreeze_pe = pnv_ioda_unfreeze_pe; 3734 3735 /* Setup MSI support */ 3736 pnv_pci_init_ioda_msis(phb); 3737 3738 /* 3739 * We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here 3740 * to let the PCI core do resource assignment. It's supposed 3741 * that the PCI core will do correct I/O and MMIO alignment 3742 * for the P2P bridge bars so that each PCI bus (excluding 3743 * the child P2P bridges) can form individual PE. 3744 */ 3745 ppc_md.pcibios_fixup = pnv_pci_ioda_fixup; 3746 3747 if (phb->type == PNV_PHB_NPU) { 3748 hose->controller_ops = pnv_npu_ioda_controller_ops; 3749 } else { 3750 phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup; 3751 hose->controller_ops = pnv_pci_ioda_controller_ops; 3752 } 3753 3754 #ifdef CONFIG_PCI_IOV 3755 ppc_md.pcibios_fixup_sriov = pnv_pci_ioda_fixup_iov_resources; 3756 ppc_md.pcibios_iov_resource_alignment = pnv_pci_iov_resource_alignment; 3757 #endif 3758 3759 pci_add_flags(PCI_REASSIGN_ALL_RSRC); 3760 3761 /* Reset IODA tables to a clean state */ 3762 rc = opal_pci_reset(phb_id, OPAL_RESET_PCI_IODA_TABLE, OPAL_ASSERT_RESET); 3763 if (rc) 3764 pr_warning(" OPAL Error %ld performing IODA table reset !\n", rc); 3765 3766 /* If we're running in kdump kerenl, the previous kerenl never 3767 * shutdown PCI devices correctly. We already got IODA table 3768 * cleaned out. So we have to issue PHB reset to stop all PCI 3769 * transactions from previous kerenl. 3770 */ 3771 if (is_kdump_kernel()) { 3772 pr_info(" Issue PHB reset ...\n"); 3773 pnv_eeh_phb_reset(hose, EEH_RESET_FUNDAMENTAL); 3774 pnv_eeh_phb_reset(hose, EEH_RESET_DEACTIVATE); 3775 } 3776 3777 /* Remove M64 resource if we can't configure it successfully */ 3778 if (!phb->init_m64 || phb->init_m64(phb)) 3779 hose->mem_resources[1].flags = 0; 3780 } 3781 3782 void __init pnv_pci_init_ioda2_phb(struct device_node *np) 3783 { 3784 pnv_pci_init_ioda_phb(np, 0, PNV_PHB_IODA2); 3785 } 3786 3787 void __init pnv_pci_init_npu_phb(struct device_node *np) 3788 { 3789 pnv_pci_init_ioda_phb(np, 0, PNV_PHB_NPU); 3790 } 3791 3792 void __init pnv_pci_init_ioda_hub(struct device_node *np) 3793 { 3794 struct device_node *phbn; 3795 const __be64 *prop64; 3796 u64 hub_id; 3797 3798 pr_info("Probing IODA IO-Hub %s\n", np->full_name); 3799 3800 prop64 = of_get_property(np, "ibm,opal-hubid", NULL); 3801 if (!prop64) { 3802 pr_err(" Missing \"ibm,opal-hubid\" property !\n"); 3803 return; 3804 } 3805 hub_id = be64_to_cpup(prop64); 3806 pr_devel(" HUB-ID : 0x%016llx\n", hub_id); 3807 3808 /* Count child PHBs */ 3809 for_each_child_of_node(np, phbn) { 3810 /* Look for IODA1 PHBs */ 3811 if (of_device_is_compatible(phbn, "ibm,ioda-phb")) 3812 pnv_pci_init_ioda_phb(phbn, hub_id, PNV_PHB_IODA1); 3813 } 3814 } 3815
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