arch/powerpc/platforms/pseries/iommu.c

   1 /*
   2  * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
   3  *
   4  * Rewrite, cleanup:
   5  *
   6  * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
   7  * Copyright (C) 2006 Olof Johansson <olof@lixom.net>
   8  *
   9  * Dynamic DMA mapping support, pSeries-specific parts, both SMP and LPAR.
  10  *
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  25  */
  26
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/mm.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/string.h>
  33 #include <linux/pci.h>
  34 #include <linux/dma-mapping.h>
  35 #include <linux/crash_dump.h>
  36 #include <linux/memory.h>
  37 #include <asm/io.h>
  38 #include <asm/prom.h>
  39 #include <asm/rtas.h>
  40 #include <asm/iommu.h>
  41 #include <asm/pci-bridge.h>
  42 #include <asm/machdep.h>
  43 #include <asm/abs_addr.h>
  44 #include <asm/pSeries_reconfig.h>
  45 #include <asm/firmware.h>
  46 #include <asm/tce.h>
  47 #include <asm/ppc-pci.h>
  48 #include <asm/udbg.h>
  49 #include <asm/mmzone.h>
  50
  51 #include "plpar_wrappers.h"
  52
  53
  54 static int tce_build_pSeries(struct iommu_table *tbl, long index,
  55                               long npages, unsigned long uaddr,
  56                               enum dma_data_direction direction,
  57                               struct dma_attrs *attrs)
  58 {
  59         u64 proto_tce;
  60         u64 *tcep;
  61         u64 rpn;
  62
  63         proto_tce = TCE_PCI_READ; // Read allowed
  64
  65         if (direction != DMA_TO_DEVICE)
  66                 proto_tce |= TCE_PCI_WRITE;
  67
  68         tcep = ((u64 *)tbl->it_base) + index;
  69
  70         while (npages--) {
  71                 /* can't move this out since we might cross MEMBLOCK boundary */
  72                 rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
  73                 *tcep = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
  74
  75                 uaddr += TCE_PAGE_SIZE;
  76                 tcep++;
  77         }
  78         return 0;
  79 }
  80
  81
  82 static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
  83 {
  84         u64 *tcep;
  85
  86         tcep = ((u64 *)tbl->it_base) + index;
  87
  88         while (npages--)
  89                 *(tcep++) = 0;
  90 }
  91
  92 static unsigned long tce_get_pseries(struct iommu_table *tbl, long index)
  93 {
  94         u64 *tcep;
  95
  96         tcep = ((u64 *)tbl->it_base) + index;
  97
  98         return *tcep;
  99 }
 100
 101 static void tce_free_pSeriesLP(struct iommu_table*, long, long);
 102 static void tce_freemulti_pSeriesLP(struct iommu_table*, long, long);
 103
 104 static int tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
 105                                 long npages, unsigned long uaddr,
 106                                 enum dma_data_direction direction,
 107                                 struct dma_attrs *attrs)
 108 {
 109         u64 rc = 0;
 110         u64 proto_tce, tce;
 111         u64 rpn;
 112         int ret = 0;
 113         long tcenum_start = tcenum, npages_start = npages;
 114
 115         rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
 116         proto_tce = TCE_PCI_READ;
 117         if (direction != DMA_TO_DEVICE)
 118                 proto_tce |= TCE_PCI_WRITE;
 119
 120         while (npages--) {
 121                 tce = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
 122                 rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, tce);
 123
 124                 if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
 125                         ret = (int)rc;
 126                         tce_free_pSeriesLP(tbl, tcenum_start,
 127                                            (npages_start - (npages + 1)));
 128                         break;
 129                 }
 130
 131                 if (rc && printk_ratelimit()) {
 132                         printk("tce_build_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc);
 133                         printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
 134                         printk("\ttcenum  = 0x%llx\n", (u64)tcenum);
 135                         printk("\ttce val = 0x%llx\n", tce );
 136                         show_stack(current, (unsigned long *)__get_SP());
 137                 }
 138
 139                 tcenum++;
 140                 rpn++;
 141         }
 142         return ret;
 143 }
 144
 145 static DEFINE_PER_CPU(u64 *, tce_page);
 146
 147 static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
 148                                      long npages, unsigned long uaddr,
 149                                      enum dma_data_direction direction,
 150                                      struct dma_attrs *attrs)
 151 {
 152         u64 rc = 0;
 153         u64 proto_tce;
 154         u64 *tcep;
 155         u64 rpn;
 156         long l, limit;
 157         long tcenum_start = tcenum, npages_start = npages;
 158         int ret = 0;
 159
 160         if (npages == 1) {
 161                 return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
 162                                            direction, attrs);
 163         }
 164
 165         tcep = __get_cpu_var(tce_page);
 166
 167         /* This is safe to do since interrupts are off when we're called
 168          * from iommu_alloc{,_sg}()
 169          */
 170         if (!tcep) {
 171                 tcep = (u64 *)__get_free_page(GFP_ATOMIC);
 172                 /* If allocation fails, fall back to the loop implementation */
 173                 if (!tcep) {
 174                         return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
 175                                             direction, attrs);
 176                 }
 177                 __get_cpu_var(tce_page) = tcep;
 178         }
 179
 180         rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
 181         proto_tce = TCE_PCI_READ;
 182         if (direction != DMA_TO_DEVICE)
 183                 proto_tce |= TCE_PCI_WRITE;
 184
 185         /* We can map max one pageful of TCEs at a time */
 186         do {
 187                 /*
 188                  * Set up the page with TCE data, looping through and setting
 189                  * the values.
 190                  */
 191                 limit = min_t(long, npages, 4096/TCE_ENTRY_SIZE);
 192
 193                 for (l = 0; l < limit; l++) {
 194                         tcep[l] = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
 195                         rpn++;
 196                 }
 197
 198                 rc = plpar_tce_put_indirect((u64)tbl->it_index,
 199                                             (u64)tcenum << 12,
 200                                             (u64)virt_to_abs(tcep),
 201                                             limit);
 202
 203                 npages -= limit;
 204                 tcenum += limit;
 205         } while (npages > 0 && !rc);
 206
 207         if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
 208                 ret = (int)rc;
 209                 tce_freemulti_pSeriesLP(tbl, tcenum_start,
 210                                         (npages_start - (npages + limit)));
 211                 return ret;
 212         }
 213
 214         if (rc && printk_ratelimit()) {
 215                 printk("tce_buildmulti_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc);
 216                 printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
 217                 printk("\tnpages  = 0x%llx\n", (u64)npages);
 218                 printk("\ttce[0] val = 0x%llx\n", tcep[0]);
 219                 show_stack(current, (unsigned long *)__get_SP());
 220         }
 221         return ret;
 222 }
 223
 224 static void tce_free_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
 225 {
 226         u64 rc;
 227
 228         while (npages--) {
 229                 rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, 0);
 230
 231                 if (rc && printk_ratelimit()) {
 232                         printk("tce_free_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc);
 233                         printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
 234                         printk("\ttcenum  = 0x%llx\n", (u64)tcenum);
 235                         show_stack(current, (unsigned long *)__get_SP());
 236                 }
 237
 238                 tcenum++;
 239         }
 240 }
 241
 242
 243 static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
 244 {
 245         u64 rc;
 246
 247         rc = plpar_tce_stuff((u64)tbl->it_index, (u64)tcenum << 12, 0, npages);
 248
 249         if (rc && printk_ratelimit()) {
 250                 printk("tce_freemulti_pSeriesLP: plpar_tce_stuff failed\n");
 251                 printk("\trc      = %lld\n", rc);
 252                 printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
 253                 printk("\tnpages  = 0x%llx\n", (u64)npages);
 254                 show_stack(current, (unsigned long *)__get_SP());
 255         }
 256 }
 257
 258 static unsigned long tce_get_pSeriesLP(struct iommu_table *tbl, long tcenum)
 259 {
 260         u64 rc;
 261         unsigned long tce_ret;
 262
 263         rc = plpar_tce_get((u64)tbl->it_index, (u64)tcenum << 12, &tce_ret);
 264
 265         if (rc && printk_ratelimit()) {
 266                 printk("tce_get_pSeriesLP: plpar_tce_get failed. rc=%lld\n", rc);
 267                 printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
 268                 printk("\ttcenum  = 0x%llx\n", (u64)tcenum);
 269                 show_stack(current, (unsigned long *)__get_SP());
 270         }
 271
 272         return tce_ret;
 273 }
 274
 275 /* this is compatable with cells for the device tree property */
 276 struct dynamic_dma_window_prop {
 277         __be32  liobn;          /* tce table number */
 278         __be64  dma_base;       /* address hi,lo */
 279         __be32  tce_shift;      /* ilog2(tce_page_size) */
 280         __be32  window_shift;   /* ilog2(tce_window_size) */
 281 };
 282
 283 struct direct_window {
 284         struct device_node *device;
 285         const struct dynamic_dma_window_prop *prop;
 286         struct list_head list;
 287 };
 288
 289 /* Dynamic DMA Window support */
 290 struct ddw_query_response {
 291         u32 windows_available;
 292         u32 largest_available_block;
 293         u32 page_size;
 294         u32 migration_capable;
 295 };
 296
 297 struct ddw_create_response {
 298         u32 liobn;
 299         u32 addr_hi;
 300         u32 addr_lo;
 301 };
 302
 303 static LIST_HEAD(direct_window_list);
 304 /* prevents races between memory on/offline and window creation */
 305 static DEFINE_SPINLOCK(direct_window_list_lock);
 306 /* protects initializing window twice for same device */
 307 static DEFINE_MUTEX(direct_window_init_mutex);
 308 #define DIRECT64_PROPNAME "linux,direct64-ddr-window-info"
 309
 310 static int tce_clearrange_multi_pSeriesLP(unsigned long start_pfn,
 311                                         unsigned long num_pfn, const void *arg)
 312 {
 313         const struct dynamic_dma_window_prop *maprange = arg;
 314         int rc;
 315         u64 tce_size, num_tce, dma_offset, next;
 316         u32 tce_shift;
 317         long limit;
 318
 319         tce_shift = be32_to_cpu(maprange->tce_shift);
 320         tce_size = 1ULL << tce_shift;
 321         next = start_pfn << PAGE_SHIFT;
 322         num_tce = num_pfn << PAGE_SHIFT;
 323
 324         /* round back to the beginning of the tce page size */
 325         num_tce += next & (tce_size - 1);
 326         next &= ~(tce_size - 1);
 327
 328         /* covert to number of tces */
 329         num_tce |= tce_size - 1;
 330         num_tce >>= tce_shift;
 331
 332         do {
 333                 /*
 334                  * Set up the page with TCE data, looping through and setting
 335                  * the values.
 336                  */
 337                 limit = min_t(long, num_tce, 512);
 338                 dma_offset = next + be64_to_cpu(maprange->dma_base);
 339
 340                 rc = plpar_tce_stuff((u64)be32_to_cpu(maprange->liobn),
 341                                              dma_offset,
 342                                              0, limit);
 343                 num_tce -= limit;
 344         } while (num_tce > 0 && !rc);
 345
 346         return rc;
 347 }
 348
 349 static int tce_setrange_multi_pSeriesLP(unsigned long start_pfn,
 350                                         unsigned long num_pfn, const void *arg)
 351 {
 352         const struct dynamic_dma_window_prop *maprange = arg;
 353         u64 *tcep, tce_size, num_tce, dma_offset, next, proto_tce, liobn;
 354         u32 tce_shift;
 355         u64 rc = 0;
 356         long l, limit;
 357
 358         local_irq_disable();    /* to protect tcep and the page behind it */
 359         tcep = __get_cpu_var(tce_page);
 360
 361         if (!tcep) {
 362                 tcep = (u64 *)__get_free_page(GFP_ATOMIC);
 363                 if (!tcep) {
 364                         local_irq_enable();
 365                         return -ENOMEM;
 366                 }
 367                 __get_cpu_var(tce_page) = tcep;
 368         }
 369
 370         proto_tce = TCE_PCI_READ | TCE_PCI_WRITE;
 371
 372         liobn = (u64)be32_to_cpu(maprange->liobn);
 373         tce_shift = be32_to_cpu(maprange->tce_shift);
 374         tce_size = 1ULL << tce_shift;
 375         next = start_pfn << PAGE_SHIFT;
 376         num_tce = num_pfn << PAGE_SHIFT;
 377
 378         /* round back to the beginning of the tce page size */
 379         num_tce += next & (tce_size - 1);
 380         next &= ~(tce_size - 1);
 381
 382         /* covert to number of tces */
 383         num_tce |= tce_size - 1;
 384         num_tce >>= tce_shift;
 385
 386         /* We can map max one pageful of TCEs at a time */
 387         do {
 388                 /*
 389                  * Set up the page with TCE data, looping through and setting
 390                  * the values.
 391                  */
 392                 limit = min_t(long, num_tce, 4096/TCE_ENTRY_SIZE);
 393                 dma_offset = next + be64_to_cpu(maprange->dma_base);
 394
 395                 for (l = 0; l < limit; l++) {
 396                         tcep[l] = proto_tce | next;
 397                         next += tce_size;
 398                 }
 399
 400                 rc = plpar_tce_put_indirect(liobn,
 401                                             dma_offset,
 402                                             (u64)virt_to_abs(tcep),
 403                                             limit);
 404
 405                 num_tce -= limit;
 406         } while (num_tce > 0 && !rc);
 407
 408         /* error cleanup: caller will clear whole range */
 409
 410         local_irq_enable();
 411         return rc;
 412 }
 413
 414 static int tce_setrange_multi_pSeriesLP_walk(unsigned long start_pfn,
 415                 unsigned long num_pfn, void *arg)
 416 {
 417         return tce_setrange_multi_pSeriesLP(start_pfn, num_pfn, arg);
 418 }
 419
 420
 421 #ifdef CONFIG_PCI
 422 static void iommu_table_setparms(struct pci_controller *phb,
 423                                  struct device_node *dn,
 424                                  struct iommu_table *tbl)
 425 {
 426         struct device_node *node;
 427         const unsigned long *basep;
 428         const u32 *sizep;
 429
 430         node = phb->dn;
 431
 432         basep = of_get_property(node, "linux,tce-base", NULL);
 433         sizep = of_get_property(node, "linux,tce-size", NULL);
 434         if (basep == NULL || sizep == NULL) {
 435                 printk(KERN_ERR "PCI_DMA: iommu_table_setparms: %s has "
 436                                 "missing tce entries !\n", dn->full_name);
 437                 return;
 438         }
 439
 440         tbl->it_base = (unsigned long)__va(*basep);
 441
 442         if (!is_kdump_kernel())
 443                 memset((void *)tbl->it_base, 0, *sizep);
 444
 445         tbl->it_busno = phb->bus->number;
 446
 447         /* Units of tce entries */
 448         tbl->it_offset = phb->dma_window_base_cur >> IOMMU_PAGE_SHIFT;
 449
 450         /* Test if we are going over 2GB of DMA space */
 451         if (phb->dma_window_base_cur + phb->dma_window_size > 0x80000000ul) {
 452                 udbg_printf("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
 453                 panic("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
 454         }
 455
 456         phb->dma_window_base_cur += phb->dma_window_size;
 457
 458         /* Set the tce table size - measured in entries */
 459         tbl->it_size = phb->dma_window_size >> IOMMU_PAGE_SHIFT;
 460
 461         tbl->it_index = 0;
 462         tbl->it_blocksize = 16;
 463         tbl->it_type = TCE_PCI;
 464 }
 465
 466 /*
 467  * iommu_table_setparms_lpar
 468  *
 469  * Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
 470  */
 471 static void iommu_table_setparms_lpar(struct pci_controller *phb,
 472                                       struct device_node *dn,
 473                                       struct iommu_table *tbl,
 474                                       const void *dma_window)
 475 {
 476         unsigned long offset, size;
 477
 478         of_parse_dma_window(dn, dma_window, &tbl->it_index, &offset, &size);
 479
 480         tbl->it_busno = phb->bus->number;
 481         tbl->it_base   = 0;
 482         tbl->it_blocksize  = 16;
 483         tbl->it_type = TCE_PCI;
 484         tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
 485         tbl->it_size = size >> IOMMU_PAGE_SHIFT;
 486 }
 487
 488 static void pci_dma_bus_setup_pSeries(struct pci_bus *bus)
 489 {
 490         struct device_node *dn;
 491         struct iommu_table *tbl;
 492         struct device_node *isa_dn, *isa_dn_orig;
 493         struct device_node *tmp;
 494         struct pci_dn *pci;
 495         int children;
 496
 497         dn = pci_bus_to_OF_node(bus);
 498
 499         pr_debug("pci_dma_bus_setup_pSeries: setting up bus %s\n", dn->full_name);
 500
 501         if (bus->self) {
 502                 /* This is not a root bus, any setup will be done for the
 503                  * device-side of the bridge in iommu_dev_setup_pSeries().
 504                  */
 505                 return;
 506         }
 507         pci = PCI_DN(dn);
 508
 509         /* Check if the ISA bus on the system is under
 510          * this PHB.
 511          */
 512         isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa");
 513
 514         while (isa_dn && isa_dn != dn)
 515                 isa_dn = isa_dn->parent;
 516
 517         if (isa_dn_orig)
 518                 of_node_put(isa_dn_orig);
 519
 520         /* Count number of direct PCI children of the PHB. */
 521         for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling)
 522                 children++;
 523
 524         pr_debug("Children: %d\n", children);
 525
 526         /* Calculate amount of DMA window per slot. Each window must be
 527          * a power of two (due to pci_alloc_consistent requirements).
 528          *
 529          * Keep 256MB aside for PHBs with ISA.
 530          */
 531
 532         if (!isa_dn) {
 533                 /* No ISA/IDE - just set window size and return */
 534                 pci->phb->dma_window_size = 0x80000000ul; /* To be divided */
 535
 536                 while (pci->phb->dma_window_size * children > 0x80000000ul)
 537                         pci->phb->dma_window_size >>= 1;
 538                 pr_debug("No ISA/IDE, window size is 0x%llx\n",
 539                          pci->phb->dma_window_size);
 540                 pci->phb->dma_window_base_cur = 0;
 541
 542                 return;
 543         }
 544
 545         /* If we have ISA, then we probably have an IDE
 546          * controller too. Allocate a 128MB table but
 547          * skip the first 128MB to avoid stepping on ISA
 548          * space.
 549          */
 550         pci->phb->dma_window_size = 0x8000000ul;
 551         pci->phb->dma_window_base_cur = 0x8000000ul;
 552
 553         tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
 554                            pci->phb->node);
 555
 556         iommu_table_setparms(pci->phb, dn, tbl);
 557         pci->iommu_table = iommu_init_table(tbl, pci->phb->node);
 558
 559         /* Divide the rest (1.75GB) among the children */
 560         pci->phb->dma_window_size = 0x80000000ul;
 561         while (pci->phb->dma_window_size * children > 0x70000000ul)
 562                 pci->phb->dma_window_size >>= 1;
 563
 564         pr_debug("ISA/IDE, window size is 0x%llx\n", pci->phb->dma_window_size);
 565 }
 566
 567
 568 static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 569 {
 570         struct iommu_table *tbl;
 571         struct device_node *dn, *pdn;
 572         struct pci_dn *ppci;
 573         const void *dma_window = NULL;
 574
 575         dn = pci_bus_to_OF_node(bus);
 576
 577         pr_debug("pci_dma_bus_setup_pSeriesLP: setting up bus %s\n",
 578                  dn->full_name);
 579
 580         /* Find nearest ibm,dma-window, walking up the device tree */
 581         for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
 582                 dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
 583                 if (dma_window != NULL)
 584                         break;
 585         }
 586
 587         if (dma_window == NULL) {
 588                 pr_debug("  no ibm,dma-window property !\n");
 589                 return;
 590         }
 591
 592         ppci = PCI_DN(pdn);
 593
 594         pr_debug("  parent is %s, iommu_table: 0x%p\n",
 595                  pdn->full_name, ppci->iommu_table);
 596
 597         if (!ppci->iommu_table) {
 598                 tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
 599                                    ppci->phb->node);
 600                 iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
 601                 ppci->iommu_table = iommu_init_table(tbl, ppci->phb->node);
 602                 pr_debug("  created table: %p\n", ppci->iommu_table);
 603         }
 604 }
 605
 606
 607 static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
 608 {
 609         struct device_node *dn;
 610         struct iommu_table *tbl;
 611
 612         pr_debug("pci_dma_dev_setup_pSeries: %s\n", pci_name(dev));
 613
 614         dn = dev->dev.of_node;
 615
 616         /* If we're the direct child of a root bus, then we need to allocate
 617          * an iommu table ourselves. The bus setup code should have setup
 618          * the window sizes already.
 619          */
 620         if (!dev->bus->self) {
 621                 struct pci_controller *phb = PCI_DN(dn)->phb;
 622
 623                 pr_debug(" --> first child, no bridge. Allocating iommu table.\n");
 624                 tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
 625                                    phb->node);
 626                 iommu_table_setparms(phb, dn, tbl);
 627                 PCI_DN(dn)->iommu_table = iommu_init_table(tbl, phb->node);
 628                 set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
 629                 return;
 630         }
 631
 632         /* If this device is further down the bus tree, search upwards until
 633          * an already allocated iommu table is found and use that.
 634          */
 635
 636         while (dn && PCI_DN(dn) && PCI_DN(dn)->iommu_table == NULL)
 637                 dn = dn->parent;
 638
 639         if (dn && PCI_DN(dn))
 640                 set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
 641         else
 642                 printk(KERN_WARNING "iommu: Device %s has no iommu table\n",
 643                        pci_name(dev));
 644 }
 645
 646 static int __read_mostly disable_ddw;
 647
 648 static int __init disable_ddw_setup(char *str)
 649 {
 650         disable_ddw = 1;
 651         printk(KERN_INFO "ppc iommu: disabling ddw.\n");
 652
 653         return 0;
 654 }
 655
 656 early_param("disable_ddw", disable_ddw_setup);
 657
 658 static void remove_ddw(struct device_node *np)
 659 {
 660         struct dynamic_dma_window_prop *dwp;
 661         struct property *win64;
 662         const u32 *ddr_avail;
 663         u64 liobn;
 664         int len, ret;
 665
 666         ddr_avail = of_get_property(np, "ibm,ddw-applicable", &len);
 667         win64 = of_find_property(np, DIRECT64_PROPNAME, NULL);
 668         if (!win64 || !ddr_avail || len < 3 * sizeof(u32))
 669                 return;
 670
 671         dwp = win64->value;
 672         liobn = (u64)be32_to_cpu(dwp->liobn);
 673
 674         /* clear the whole window, note the arg is in kernel pages */
 675         ret = tce_clearrange_multi_pSeriesLP(0,
 676                 1ULL << (be32_to_cpu(dwp->window_shift) - PAGE_SHIFT), dwp);
 677         if (ret)
 678                 pr_warning("%s failed to clear tces in window.\n",
 679                          np->full_name);
 680         else
 681                 pr_debug("%s successfully cleared tces in window.\n",
 682                          np->full_name);
 683
 684         ret = rtas_call(ddr_avail[2], 1, 1, NULL, liobn);
 685         if (ret)
 686                 pr_warning("%s: failed to remove direct window: rtas returned "
 687                         "%d to ibm,remove-pe-dma-window(%x) %llx\n",
 688                         np->full_name, ret, ddr_avail[2], liobn);
 689         else
 690                 pr_debug("%s: successfully removed direct window: rtas returned "
 691                         "%d to ibm,remove-pe-dma-window(%x) %llx\n",
 692                         np->full_name, ret, ddr_avail[2], liobn);
 693 }
 694
 695
 696 static int dupe_ddw_if_already_created(struct pci_dev *dev, struct device_node *pdn)
 697 {
 698         struct device_node *dn;
 699         struct pci_dn *pcidn;
 700         struct direct_window *window;
 701         const struct dynamic_dma_window_prop *direct64;
 702         u64 dma_addr = 0;
 703
 704         dn = pci_device_to_OF_node(dev);
 705         pcidn = PCI_DN(dn);
 706         spin_lock(&direct_window_list_lock);
 707         /* check if we already created a window and dupe that config if so */
 708         list_for_each_entry(window, &direct_window_list, list) {
 709                 if (window->device == pdn) {
 710                         direct64 = window->prop;
 711                         dma_addr = direct64->dma_base;
 712                         break;
 713                 }
 714         }
 715         spin_unlock(&direct_window_list_lock);
 716
 717         return dma_addr;
 718 }
 719
 720 static u64 dupe_ddw_if_kexec(struct pci_dev *dev, struct device_node *pdn)
 721 {
 722         struct device_node *dn;
 723         struct pci_dn *pcidn;
 724         int len;
 725         struct direct_window *window;
 726         const struct dynamic_dma_window_prop *direct64;
 727         u64 dma_addr = 0;
 728
 729         dn = pci_device_to_OF_node(dev);
 730         pcidn = PCI_DN(dn);
 731         direct64 = of_get_property(pdn, DIRECT64_PROPNAME, &len);
 732         if (direct64) {
 733                 window = kzalloc(sizeof(*window), GFP_KERNEL);
 734                 if (!window) {
 735                         remove_ddw(pdn);
 736                 } else {
 737                         window->device = pdn;
 738                         window->prop = direct64;
 739                         spin_lock(&direct_window_list_lock);
 740                         list_add(&window->list, &direct_window_list);
 741                         spin_unlock(&direct_window_list_lock);
 742                         dma_addr = direct64->dma_base;
 743                 }
 744         }
 745
 746         return dma_addr;
 747 }
 748
 749 static int query_ddw(struct pci_dev *dev, const u32 *ddr_avail,
 750                         struct ddw_query_response *query)
 751 {
 752         struct device_node *dn;
 753         struct pci_dn *pcidn;
 754         u32 cfg_addr;
 755         u64 buid;
 756         int ret;
 757
 758         /*
 759          * Get the config address and phb buid of the PE window.
 760          * Rely on eeh to retrieve this for us.
 761          * Retrieve them from the pci device, not the node with the
 762          * dma-window property
 763          */
 764         dn = pci_device_to_OF_node(dev);
 765         pcidn = PCI_DN(dn);
 766         cfg_addr = pcidn->eeh_config_addr;
 767         if (pcidn->eeh_pe_config_addr)
 768                 cfg_addr = pcidn->eeh_pe_config_addr;
 769         buid = pcidn->phb->buid;
 770         ret = rtas_call(ddr_avail[0], 3, 5, (u32 *)query,
 771                   cfg_addr, BUID_HI(buid), BUID_LO(buid));
 772         dev_info(&dev->dev, "ibm,query-pe-dma-windows(%x) %x %x %x"
 773                 " returned %d\n", ddr_avail[0], cfg_addr, BUID_HI(buid),
 774                 BUID_LO(buid), ret);
 775         return ret;
 776 }
 777
 778 static int create_ddw(struct pci_dev *dev, const u32 *ddr_avail,
 779                         struct ddw_create_response *create, int page_shift,
 780                         int window_shift)
 781 {
 782         struct device_node *dn;
 783         struct pci_dn *pcidn;
 784         u32 cfg_addr;
 785         u64 buid;
 786         int ret;
 787
 788         /*
 789          * Get the config address and phb buid of the PE window.
 790          * Rely on eeh to retrieve this for us.
 791          * Retrieve them from the pci device, not the node with the
 792          * dma-window property
 793          */
 794         dn = pci_device_to_OF_node(dev);
 795         pcidn = PCI_DN(dn);
 796         cfg_addr = pcidn->eeh_config_addr;
 797         if (pcidn->eeh_pe_config_addr)
 798                 cfg_addr = pcidn->eeh_pe_config_addr;
 799         buid = pcidn->phb->buid;
 800
 801         do {
 802                 /* extra outputs are LIOBN and dma-addr (hi, lo) */
 803                 ret = rtas_call(ddr_avail[1], 5, 4, (u32 *)create, cfg_addr,
 804                                 BUID_HI(buid), BUID_LO(buid), page_shift, window_shift);
 805         } while (rtas_busy_delay(ret));
 806         dev_info(&dev->dev,
 807                 "ibm,create-pe-dma-window(%x) %x %x %x %x %x returned %d "
 808                 "(liobn = 0x%x starting addr = %x %x)\n", ddr_avail[1],
 809                  cfg_addr, BUID_HI(buid), BUID_LO(buid), page_shift,
 810                  window_shift, ret, create->liobn, create->addr_hi, create->addr_lo);
 811
 812         return ret;
 813 }
 814
 815 /*
 816  * If the PE supports dynamic dma windows, and there is space for a table
 817  * that can map all pages in a linear offset, then setup such a table,
 818  * and record the dma-offset in the struct device.
 819  *
 820  * dev: the pci device we are checking
 821  * pdn: the parent pe node with the ibm,dma_window property
 822  * Future: also check if we can remap the base window for our base page size
 823  *
 824  * returns the dma offset for use by dma_set_mask
 825  */
 826 static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn)
 827 {
 828         int len, ret;
 829         struct ddw_query_response query;
 830         struct ddw_create_response create;
 831         int page_shift;
 832         u64 dma_addr, max_addr;
 833         struct device_node *dn;
 834         const u32 *uninitialized_var(ddr_avail);
 835         struct direct_window *window;
 836         struct property *uninitialized_var(win64);
 837         struct dynamic_dma_window_prop *ddwprop;
 838
 839         mutex_lock(&direct_window_init_mutex);
 840
 841         dma_addr = dupe_ddw_if_already_created(dev, pdn);
 842         if (dma_addr != 0)
 843                 goto out_unlock;
 844
 845         dma_addr = dupe_ddw_if_kexec(dev, pdn);
 846         if (dma_addr != 0)
 847                 goto out_unlock;
 848
 849         /*
 850          * the ibm,ddw-applicable property holds the tokens for:
 851          * ibm,query-pe-dma-window
 852          * ibm,create-pe-dma-window
 853          * ibm,remove-pe-dma-window
 854          * for the given node in that order.
 855          * the property is actually in the parent, not the PE
 856          */
 857         ddr_avail = of_get_property(pdn, "ibm,ddw-applicable", &len);
 858         if (!ddr_avail || len < 3 * sizeof(u32))
 859                 goto out_unlock;
 860
 861        /*
 862          * Query if there is a second window of size to map the
 863          * whole partition.  Query returns number of windows, largest
 864          * block assigned to PE (partition endpoint), and two bitmasks
 865          * of page sizes: supported and supported for migrate-dma.
 866          */
 867         dn = pci_device_to_OF_node(dev);
 868         ret = query_ddw(dev, ddr_avail, &query);
 869         if (ret != 0)
 870                 goto out_unlock;
 871
 872         if (query.windows_available == 0) {
 873                 /*
 874                  * no additional windows are available for this device.
 875                  * We might be able to reallocate the existing window,
 876                  * trading in for a larger page size.
 877                  */
 878                 dev_dbg(&dev->dev, "no free dynamic windows");
 879                 goto out_unlock;
 880         }
 881         if (query.page_size & 4) {
 882                 page_shift = 24; /* 16MB */
 883         } else if (query.page_size & 2) {
 884                 page_shift = 16; /* 64kB */
 885         } else if (query.page_size & 1) {
 886                 page_shift = 12; /* 4kB */
 887         } else {
 888                 dev_dbg(&dev->dev, "no supported direct page size in mask %x",
 889                           query.page_size);
 890                 goto out_unlock;
 891         }
 892         /* verify the window * number of ptes will map the partition */
 893         /* check largest block * page size > max memory hotplug addr */
 894         max_addr = memory_hotplug_max();
 895         if (query.largest_available_block < (max_addr >> page_shift)) {
 896                 dev_dbg(&dev->dev, "can't map partiton max 0x%llx with %u "
 897                           "%llu-sized pages\n", max_addr,  query.largest_available_block,
 898                           1ULL << page_shift);
 899                 goto out_unlock;
 900         }
 901         len = order_base_2(max_addr);
 902         win64 = kzalloc(sizeof(struct property), GFP_KERNEL);
 903         if (!win64) {
 904                 dev_info(&dev->dev,
 905                         "couldn't allocate property for 64bit dma window\n");
 906                 goto out_unlock;
 907         }
 908         win64->name = kstrdup(DIRECT64_PROPNAME, GFP_KERNEL);
 909         win64->value = ddwprop = kmalloc(sizeof(*ddwprop), GFP_KERNEL);
 910         if (!win64->name || !win64->value) {
 911                 dev_info(&dev->dev,
 912                         "couldn't allocate property name and value\n");
 913                 goto out_free_prop;
 914         }
 915
 916         ret = create_ddw(dev, ddr_avail, &create, page_shift, len);
 917         if (ret != 0)
 918                 goto out_free_prop;
 919
 920         ddwprop->liobn = cpu_to_be32(create.liobn);
 921         ddwprop->dma_base = cpu_to_be64(of_read_number(&create.addr_hi, 2));
 922         ddwprop->tce_shift = cpu_to_be32(page_shift);
 923         ddwprop->window_shift = cpu_to_be32(len);
 924
 925         dev_dbg(&dev->dev, "created tce table LIOBN 0x%x for %s\n",
 926                   create.liobn, dn->full_name);
 927
 928         window = kzalloc(sizeof(*window), GFP_KERNEL);
 929         if (!window)
 930                 goto out_clear_window;
 931
 932         ret = walk_system_ram_range(0, memblock_end_of_DRAM() >> PAGE_SHIFT,
 933                         win64->value, tce_setrange_multi_pSeriesLP_walk);
 934         if (ret) {
 935                 dev_info(&dev->dev, "failed to map direct window for %s: %d\n",
 936                          dn->full_name, ret);
 937                 goto out_clear_window;
 938         }
 939
 940         ret = prom_add_property(pdn, win64);
 941         if (ret) {
 942                 dev_err(&dev->dev, "unable to add dma window property for %s: %d",
 943                          pdn->full_name, ret);
 944                 goto out_clear_window;
 945         }
 946
 947         window->device = pdn;
 948         window->prop = ddwprop;
 949         spin_lock(&direct_window_list_lock);
 950         list_add(&window->list, &direct_window_list);
 951         spin_unlock(&direct_window_list_lock);
 952
 953         dma_addr = of_read_number(&create.addr_hi, 2);
 954         goto out_unlock;
 955
 956 out_clear_window:
 957         remove_ddw(pdn);
 958
 959 out_free_prop:
 960         kfree(win64->name);
 961         kfree(win64->value);
 962         kfree(win64);
 963
 964 out_unlock:
 965         mutex_unlock(&direct_window_init_mutex);
 966         return dma_addr;
 967 }
 968
 969 static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
 970 {
 971         struct device_node *pdn, *dn;
 972         struct iommu_table *tbl;
 973         const void *dma_window = NULL;
 974         struct pci_dn *pci;
 975
 976         pr_debug("pci_dma_dev_setup_pSeriesLP: %s\n", pci_name(dev));
 977
 978         /* dev setup for LPAR is a little tricky, since the device tree might
 979          * contain the dma-window properties per-device and not neccesarily
 980          * for the bus. So we need to search upwards in the tree until we
 981          * either hit a dma-window property, OR find a parent with a table
 982          * already allocated.
 983          */
 984         dn = pci_device_to_OF_node(dev);
 985         pr_debug("  node is %s\n", dn->full_name);
 986
 987         for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table;
 988              pdn = pdn->parent) {
 989                 dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
 990                 if (dma_window)
 991                         break;
 992         }
 993
 994         if (!pdn || !PCI_DN(pdn)) {
 995                 printk(KERN_WARNING "pci_dma_dev_setup_pSeriesLP: "
 996                        "no DMA window found for pci dev=%s dn=%s\n",
 997                                  pci_name(dev), dn? dn->full_name : "<null>");
 998                 return;
 999         }
1000         pr_debug("  parent is %s\n", pdn->full_name);
1001
1002         pci = PCI_DN(pdn);
1003         if (!pci->iommu_table) {
1004                 tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
1005                                    pci->phb->node);
1006                 iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
1007                 pci->iommu_table = iommu_init_table(tbl, pci->phb->node);
1008                 pr_debug("  created table: %p\n", pci->iommu_table);
1009         } else {
1010                 pr_debug("  found DMA window, table: %p\n", pci->iommu_table);
1011         }
1012
1013         set_iommu_table_base(&dev->dev, pci->iommu_table);
1014 }
1015
1016 static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask)
1017 {
1018         bool ddw_enabled = false;
1019         struct device_node *pdn, *dn;
1020         struct pci_dev *pdev;
1021         const void *dma_window = NULL;
1022         u64 dma_offset;
1023
1024         if (!dev->dma_mask || !dma_supported(dev, dma_mask))
1025                 return -EIO;
1026
1027         /* only attempt to use a new window if 64-bit DMA is requested */
1028         if (!disable_ddw && dma_mask == DMA_BIT_MASK(64)) {
1029                 pdev = to_pci_dev(dev);
1030
1031                 dn = pci_device_to_OF_node(pdev);
1032                 dev_dbg(dev, "node is %s\n", dn->full_name);
1033
1034                 /*
1035                  * the device tree might contain the dma-window properties
1036                  * per-device and not neccesarily for the bus. So we need to
1037                  * search upwards in the tree until we either hit a dma-window
1038                  * property, OR find a parent with a table already allocated.
1039                  */
1040                 for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table;
1041                                 pdn = pdn->parent) {
1042                         dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
1043                         if (dma_window)
1044                                 break;
1045                 }
1046                 if (pdn && PCI_DN(pdn)) {
1047                         dma_offset = enable_ddw(pdev, pdn);
1048                         if (dma_offset != 0) {
1049                                 dev_info(dev, "Using 64-bit direct DMA at offset %llx\n", dma_offset);
1050                                 set_dma_offset(dev, dma_offset);
1051                                 set_dma_ops(dev, &dma_direct_ops);
1052                                 ddw_enabled = true;
1053                         }
1054                 }
1055         }
1056
1057         /* fall-through to iommu ops */
1058         if (!ddw_enabled) {
1059                 dev_info(dev, "Using 32-bit DMA via iommu\n");
1060                 set_dma_ops(dev, &dma_iommu_ops);
1061         }
1062
1063         *dev->dma_mask = dma_mask;
1064         return 0;
1065 }
1066
1067 #else  /* CONFIG_PCI */
1068 #define pci_dma_bus_setup_pSeries       NULL
1069 #define pci_dma_dev_setup_pSeries       NULL
1070 #define pci_dma_bus_setup_pSeriesLP     NULL
1071 #define pci_dma_dev_setup_pSeriesLP     NULL
1072 #define dma_set_mask_pSeriesLP          NULL
1073 #endif /* !CONFIG_PCI */
1074
1075 static int iommu_mem_notifier(struct notifier_block *nb, unsigned long action,
1076                 void *data)
1077 {
1078         struct direct_window *window;
1079         struct memory_notify *arg = data;
1080         int ret = 0;
1081
1082         switch (action) {
1083         case MEM_GOING_ONLINE:
1084                 spin_lock(&direct_window_list_lock);
1085                 list_for_each_entry(window, &direct_window_list, list) {
1086                         ret |= tce_setrange_multi_pSeriesLP(arg->start_pfn,
1087                                         arg->nr_pages, window->prop);
1088                         /* XXX log error */
1089                 }
1090                 spin_unlock(&direct_window_list_lock);
1091                 break;
1092         case MEM_CANCEL_ONLINE:
1093         case MEM_OFFLINE:
1094                 spin_lock(&direct_window_list_lock);
1095                 list_for_each_entry(window, &direct_window_list, list) {
1096                         ret |= tce_clearrange_multi_pSeriesLP(arg->start_pfn,
1097                                         arg->nr_pages, window->prop);
1098                         /* XXX log error */
1099                 }
1100                 spin_unlock(&direct_window_list_lock);
1101                 break;
1102         default:
1103                 break;
1104         }
1105         if (ret && action != MEM_CANCEL_ONLINE)
1106                 return NOTIFY_BAD;
1107
1108         return NOTIFY_OK;
1109 }
1110
1111 static struct notifier_block iommu_mem_nb = {
1112         .notifier_call = iommu_mem_notifier,
1113 };
1114
1115 static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
1116 {
1117         int err = NOTIFY_OK;
1118         struct device_node *np = node;
1119         struct pci_dn *pci = PCI_DN(np);
1120         struct direct_window *window;
1121
1122         switch (action) {
1123         case PSERIES_RECONFIG_REMOVE:
1124                 if (pci && pci->iommu_table)
1125                         iommu_free_table(pci->iommu_table, np->full_name);
1126
1127                 spin_lock(&direct_window_list_lock);
1128                 list_for_each_entry(window, &direct_window_list, list) {
1129                         if (window->device == np) {
1130                                 list_del(&window->list);
1131                                 kfree(window);
1132                                 break;
1133                         }
1134                 }
1135                 spin_unlock(&direct_window_list_lock);
1136
1137                 /*
1138                  * Because the notifier runs after isolation of the
1139                  * slot, we are guaranteed any DMA window has already
1140                  * been revoked and the TCEs have been marked invalid,
1141                  * so we don't need a call to remove_ddw(np). However,
1142                  * if an additional notifier action is added before the
1143                  * isolate call, we should update this code for
1144                  * completeness with such a call.
1145                  */
1146                 break;
1147         default:
1148                 err = NOTIFY_DONE;
1149                 break;
1150         }
1151         return err;
1152 }
1153
1154 static struct notifier_block iommu_reconfig_nb = {
1155         .notifier_call = iommu_reconfig_notifier,
1156 };
1157
1158 /* These are called very early. */
1159 void iommu_init_early_pSeries(void)
1160 {
1161         if (of_chosen && of_get_property(of_chosen, "linux,iommu-off", NULL))
1162                 return;
1163
1164         if (firmware_has_feature(FW_FEATURE_LPAR)) {
1165                 if (firmware_has_feature(FW_FEATURE_MULTITCE)) {
1166                         ppc_md.tce_build = tce_buildmulti_pSeriesLP;
1167                         ppc_md.tce_free  = tce_freemulti_pSeriesLP;
1168                 } else {
1169                         ppc_md.tce_build = tce_build_pSeriesLP;
1170                         ppc_md.tce_free  = tce_free_pSeriesLP;
1171                 }
1172                 ppc_md.tce_get   = tce_get_pSeriesLP;
1173                 ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pSeriesLP;
1174                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pSeriesLP;
1175                 ppc_md.dma_set_mask = dma_set_mask_pSeriesLP;
1176         } else {
1177                 ppc_md.tce_build = tce_build_pSeries;
1178                 ppc_md.tce_free  = tce_free_pSeries;
1179                 ppc_md.tce_get   = tce_get_pseries;
1180                 ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pSeries;
1181                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pSeries;
1182         }
1183
1184
1185         pSeries_reconfig_notifier_register(&iommu_reconfig_nb);
1186         register_memory_notifier(&iommu_mem_nb);
1187
1188         set_pci_dma_ops(&dma_iommu_ops);
1189 }
1190
1191 static int __init disable_multitce(char *str)
1192 {
1193         if (strcmp(str, "off") == 0 &&
1194             firmware_has_feature(FW_FEATURE_LPAR) &&
1195             firmware_has_feature(FW_FEATURE_MULTITCE)) {
1196                 printk(KERN_INFO "Disabling MULTITCE firmware feature\n");
1197                 ppc_md.tce_build = tce_build_pSeriesLP;
1198                 ppc_md.tce_free  = tce_free_pSeriesLP;
1199                 powerpc_firmware_features &= ~FW_FEATURE_MULTITCE;
1200         }
1201         return 1;
1202 }
1203
1204 __setup("multitce=", disable_multitce);