hw/ppc/spapr_iommu.c

   1 /*
   2  * QEMU sPAPR IOMMU (TCE) code
   3  *
   4  * Copyright (c) 2010 David Gibson, IBM Corporation <dwg@au1.ibm.com>
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #include "qemu/osdep.h"
  20 #include "hw/hw.h"
  21 #include "qemu/log.h"
  22 #include "sysemu/kvm.h"
  23 #include "hw/qdev.h"
  24 #include "kvm_ppc.h"
  25 #include "sysemu/dma.h"
  26 #include "exec/address-spaces.h"
  27 #include "trace.h"
  28
  29 #include "hw/ppc/spapr.h"
  30 #include "hw/ppc/spapr_vio.h"
  31
  32 #include <libfdt.h>
  33
  34 enum sPAPRTCEAccess {
  35     SPAPR_TCE_FAULT = 0,
  36     SPAPR_TCE_RO = 1,
  37     SPAPR_TCE_WO = 2,
  38     SPAPR_TCE_RW = 3,
  39 };
  40
  41 #define IOMMU_PAGE_SIZE(shift)      (1ULL << (shift))
  42 #define IOMMU_PAGE_MASK(shift)      (~(IOMMU_PAGE_SIZE(shift) - 1))
  43
  44 static QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
  45
  46 sPAPRTCETable *spapr_tce_find_by_liobn(target_ulong liobn)
  47 {
  48     sPAPRTCETable *tcet;
  49
  50     if (liobn & 0xFFFFFFFF00000000ULL) {
  51         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
  52                       liobn);
  53         return NULL;
  54     }
  55
  56     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
  57         if (tcet->liobn == (uint32_t)liobn) {
  58             return tcet;
  59         }
  60     }
  61
  62     return NULL;
  63 }
  64
  65 static IOMMUAccessFlags spapr_tce_iommu_access_flags(uint64_t tce)
  66 {
  67     switch (tce & SPAPR_TCE_RW) {
  68     case SPAPR_TCE_FAULT:
  69         return IOMMU_NONE;
  70     case SPAPR_TCE_RO:
  71         return IOMMU_RO;
  72     case SPAPR_TCE_WO:
  73         return IOMMU_WO;
  74     default: /* SPAPR_TCE_RW */
  75         return IOMMU_RW;
  76     }
  77 }
  78
  79 /* Called from RCU critical section */
  80 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr,
  81                                                bool is_write)
  82 {
  83     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
  84     uint64_t tce;
  85     IOMMUTLBEntry ret = {
  86         .target_as = &address_space_memory,
  87         .iova = 0,
  88         .translated_addr = 0,
  89         .addr_mask = ~(hwaddr)0,
  90         .perm = IOMMU_NONE,
  91     };
  92
  93     if ((addr >> tcet->page_shift) < tcet->nb_table) {
  94         /* Check if we are in bound */
  95         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
  96
  97         tce = tcet->table[addr >> tcet->page_shift];
  98         ret.iova = addr & page_mask;
  99         ret.translated_addr = tce & page_mask;
 100         ret.addr_mask = ~page_mask;
 101         ret.perm = spapr_tce_iommu_access_flags(tce);
 102     }
 103     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
 104                             ret.addr_mask);
 105
 106     return ret;
 107 }
 108
 109 static int spapr_tce_table_post_load(void *opaque, int version_id)
 110 {
 111     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
 112
 113     if (tcet->vdev) {
 114         spapr_vio_set_bypass(tcet->vdev, tcet->bypass);
 115     }
 116
 117     return 0;
 118 }
 119
 120 static const VMStateDescription vmstate_spapr_tce_table = {
 121     .name = "spapr_iommu",
 122     .version_id = 2,
 123     .minimum_version_id = 2,
 124     .post_load = spapr_tce_table_post_load,
 125     .fields      = (VMStateField []) {
 126         /* Sanity check */
 127         VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
 128         VMSTATE_UINT32_EQUAL(nb_table, sPAPRTCETable),
 129
 130         /* IOMMU state */
 131         VMSTATE_BOOL(bypass, sPAPRTCETable),
 132         VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
 133
 134         VMSTATE_END_OF_LIST()
 135     },
 136 };
 137
 138 static MemoryRegionIOMMUOps spapr_iommu_ops = {
 139     .translate = spapr_tce_translate_iommu,
 140 };
 141
 142 static int spapr_tce_table_realize(DeviceState *dev)
 143 {
 144     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 145     uint64_t window_size = (uint64_t)tcet->nb_table << tcet->page_shift;
 146
 147     if (kvm_enabled() && !(window_size >> 32)) {
 148         tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
 149                                               window_size,
 150                                               &tcet->fd,
 151                                               tcet->need_vfio);
 152     }
 153
 154     if (!tcet->table) {
 155         size_t table_size = tcet->nb_table * sizeof(uint64_t);
 156         tcet->table = g_malloc0(table_size);
 157     }
 158
 159     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
 160
 161     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
 162                              "iommu-spapr",
 163                              (uint64_t)tcet->nb_table << tcet->page_shift);
 164
 165     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 166
 167     vmstate_register(DEVICE(tcet), tcet->liobn, &vmstate_spapr_tce_table,
 168                      tcet);
 169
 170     return 0;
 171 }
 172
 173 void spapr_tce_set_need_vfio(sPAPRTCETable *tcet, bool need_vfio)
 174 {
 175     size_t table_size = tcet->nb_table * sizeof(uint64_t);
 176     void *newtable;
 177
 178     if (need_vfio == tcet->need_vfio) {
 179         /* Nothing to do */
 180         return;
 181     }
 182
 183     if (!need_vfio) {
 184         /* FIXME: We don't support transition back to KVM accelerated
 185          * TCEs yet */
 186         return;
 187     }
 188
 189     tcet->need_vfio = true;
 190
 191     if (tcet->fd < 0) {
 192         /* Table is already in userspace, nothing to be do */
 193         return;
 194     }
 195
 196     newtable = g_malloc(table_size);
 197     memcpy(newtable, tcet->table, table_size);
 198
 199     kvmppc_remove_spapr_tce(tcet->table, tcet->fd, tcet->nb_table);
 200
 201     tcet->fd = -1;
 202     tcet->table = newtable;
 203 }
 204
 205 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn,
 206                                    uint64_t bus_offset,
 207                                    uint32_t page_shift,
 208                                    uint32_t nb_table,
 209                                    bool need_vfio)
 210 {
 211     sPAPRTCETable *tcet;
 212     char tmp[64];
 213
 214     if (spapr_tce_find_by_liobn(liobn)) {
 215         fprintf(stderr, "Attempted to create TCE table with duplicate"
 216                 " LIOBN 0x%x\n", liobn);
 217         return NULL;
 218     }
 219
 220     if (!nb_table) {
 221         return NULL;
 222     }
 223
 224     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
 225     tcet->liobn = liobn;
 226     tcet->bus_offset = bus_offset;
 227     tcet->page_shift = page_shift;
 228     tcet->nb_table = nb_table;
 229     tcet->need_vfio = need_vfio;
 230
 231     snprintf(tmp, sizeof(tmp), "tce-table-%x", liobn);
 232     object_property_add_child(OBJECT(owner), tmp, OBJECT(tcet), NULL);
 233
 234     object_property_set_bool(OBJECT(tcet), true, "realized", NULL);
 235
 236     return tcet;
 237 }
 238
 239 static void spapr_tce_table_unrealize(DeviceState *dev, Error **errp)
 240 {
 241     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 242
 243     QLIST_REMOVE(tcet, list);
 244
 245     if (!kvm_enabled() ||
 246         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 247                                  tcet->nb_table) != 0)) {
 248         g_free(tcet->table);
 249     }
 250 }
 251
 252 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 253 {
 254     return &tcet->iommu;
 255 }
 256
 257 static void spapr_tce_reset(DeviceState *dev)
 258 {
 259     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 260     size_t table_size = tcet->nb_table * sizeof(uint64_t);
 261
 262     memset(tcet->table, 0, table_size);
 263 }
 264
 265 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 266                                 target_ulong tce)
 267 {
 268     IOMMUTLBEntry entry;
 269     hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 270     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 271
 272     if (index >= tcet->nb_table) {
 273         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 274                       TARGET_FMT_lx "\n", ioba);
 275         return H_PARAMETER;
 276     }
 277
 278     tcet->table[index] = tce;
 279
 280     entry.target_as = &address_space_memory,
 281     entry.iova = ioba & page_mask;
 282     entry.translated_addr = tce & page_mask;
 283     entry.addr_mask = ~page_mask;
 284     entry.perm = spapr_tce_iommu_access_flags(tce);
 285     memory_region_notify_iommu(&tcet->iommu, entry);
 286
 287     return H_SUCCESS;
 288 }
 289
 290 static target_ulong h_put_tce_indirect(PowerPCCPU *cpu,
 291                                        sPAPRMachineState *spapr,
 292                                        target_ulong opcode, target_ulong *args)
 293 {
 294     int i;
 295     target_ulong liobn = args[0];
 296     target_ulong ioba = args[1];
 297     target_ulong ioba1 = ioba;
 298     target_ulong tce_list = args[2];
 299     target_ulong npages = args[3];
 300     target_ulong ret = H_PARAMETER, tce = 0;
 301     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 302     CPUState *cs = CPU(cpu);
 303     hwaddr page_mask, page_size;
 304
 305     if (!tcet) {
 306         return H_PARAMETER;
 307     }
 308
 309     if ((npages > 512) || (tce_list & SPAPR_TCE_PAGE_MASK)) {
 310         return H_PARAMETER;
 311     }
 312
 313     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 314     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 315     ioba &= page_mask;
 316
 317     for (i = 0; i < npages; ++i, ioba += page_size) {
 318         tce = ldq_be_phys(cs->as, tce_list + i * sizeof(target_ulong));
 319
 320         ret = put_tce_emu(tcet, ioba, tce);
 321         if (ret) {
 322             break;
 323         }
 324     }
 325
 326     /* Trace last successful or the first problematic entry */
 327     i = i ? (i - 1) : 0;
 328     if (SPAPR_IS_PCI_LIOBN(liobn)) {
 329         trace_spapr_iommu_pci_indirect(liobn, ioba1, tce_list, i, tce, ret);
 330     } else {
 331         trace_spapr_iommu_indirect(liobn, ioba1, tce_list, i, tce, ret);
 332     }
 333     return ret;
 334 }
 335
 336 static target_ulong h_stuff_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 337                               target_ulong opcode, target_ulong *args)
 338 {
 339     int i;
 340     target_ulong liobn = args[0];
 341     target_ulong ioba = args[1];
 342     target_ulong tce_value = args[2];
 343     target_ulong npages = args[3];
 344     target_ulong ret = H_PARAMETER;
 345     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 346     hwaddr page_mask, page_size;
 347
 348     if (!tcet) {
 349         return H_PARAMETER;
 350     }
 351
 352     if (npages > tcet->nb_table) {
 353         return H_PARAMETER;
 354     }
 355
 356     page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 357     page_size = IOMMU_PAGE_SIZE(tcet->page_shift);
 358     ioba &= page_mask;
 359
 360     for (i = 0; i < npages; ++i, ioba += page_size) {
 361         ret = put_tce_emu(tcet, ioba, tce_value);
 362         if (ret) {
 363             break;
 364         }
 365     }
 366     if (SPAPR_IS_PCI_LIOBN(liobn)) {
 367         trace_spapr_iommu_pci_stuff(liobn, ioba, tce_value, npages, ret);
 368     } else {
 369         trace_spapr_iommu_stuff(liobn, ioba, tce_value, npages, ret);
 370     }
 371
 372     return ret;
 373 }
 374
 375 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 376                               target_ulong opcode, target_ulong *args)
 377 {
 378     target_ulong liobn = args[0];
 379     target_ulong ioba = args[1];
 380     target_ulong tce = args[2];
 381     target_ulong ret = H_PARAMETER;
 382     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 383
 384     if (tcet) {
 385         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 386
 387         ioba &= page_mask;
 388
 389         ret = put_tce_emu(tcet, ioba, tce);
 390     }
 391     if (SPAPR_IS_PCI_LIOBN(liobn)) {
 392         trace_spapr_iommu_pci_put(liobn, ioba, tce, ret);
 393     } else {
 394         trace_spapr_iommu_put(liobn, ioba, tce, ret);
 395     }
 396
 397     return ret;
 398 }
 399
 400 static target_ulong get_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 401                                 target_ulong *tce)
 402 {
 403     unsigned long index = (ioba - tcet->bus_offset) >> tcet->page_shift;
 404
 405     if (index >= tcet->nb_table) {
 406         hcall_dprintf("spapr_iommu_get_tce on out-of-bounds IOBA 0x"
 407                       TARGET_FMT_lx "\n", ioba);
 408         return H_PARAMETER;
 409     }
 410
 411     *tce = tcet->table[index];
 412
 413     return H_SUCCESS;
 414 }
 415
 416 static target_ulong h_get_tce(PowerPCCPU *cpu, sPAPRMachineState *spapr,
 417                               target_ulong opcode, target_ulong *args)
 418 {
 419     target_ulong liobn = args[0];
 420     target_ulong ioba = args[1];
 421     target_ulong tce = 0;
 422     target_ulong ret = H_PARAMETER;
 423     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 424
 425     if (tcet) {
 426         hwaddr page_mask = IOMMU_PAGE_MASK(tcet->page_shift);
 427
 428         ioba &= page_mask;
 429
 430         ret = get_tce_emu(tcet, ioba, &tce);
 431         if (!ret) {
 432             args[0] = tce;
 433         }
 434     }
 435     if (SPAPR_IS_PCI_LIOBN(liobn)) {
 436         trace_spapr_iommu_pci_get(liobn, ioba, ret, tce);
 437     } else {
 438         trace_spapr_iommu_get(liobn, ioba, ret, tce);
 439     }
 440
 441     return ret;
 442 }
 443
 444 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 445                  uint32_t liobn, uint64_t window, uint32_t size)
 446 {
 447     uint32_t dma_prop[5];
 448     int ret;
 449
 450     dma_prop[0] = cpu_to_be32(liobn);
 451     dma_prop[1] = cpu_to_be32(window >> 32);
 452     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 453     dma_prop[3] = 0; /* window size is 32 bits */
 454     dma_prop[4] = cpu_to_be32(size);
 455
 456     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 457     if (ret < 0) {
 458         return ret;
 459     }
 460
 461     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 462     if (ret < 0) {
 463         return ret;
 464     }
 465
 466     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 467     if (ret < 0) {
 468         return ret;
 469     }
 470
 471     return 0;
 472 }
 473
 474 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 475                       sPAPRTCETable *tcet)
 476 {
 477     if (!tcet) {
 478         return 0;
 479     }
 480
 481     return spapr_dma_dt(fdt, node_off, propname,
 482                         tcet->liobn, 0, tcet->nb_table << tcet->page_shift);
 483 }
 484
 485 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 486 {
 487     DeviceClass *dc = DEVICE_CLASS(klass);
 488     dc->init = spapr_tce_table_realize;
 489     dc->reset = spapr_tce_reset;
 490     dc->unrealize = spapr_tce_table_unrealize;
 491
 492     QLIST_INIT(&spapr_tce_tables);
 493
 494     /* hcall-tce */
 495     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 496     spapr_register_hypercall(H_GET_TCE, h_get_tce);
 497     spapr_register_hypercall(H_PUT_TCE_INDIRECT, h_put_tce_indirect);
 498     spapr_register_hypercall(H_STUFF_TCE, h_stuff_tce);
 499 }
 500
 501 static TypeInfo spapr_tce_table_info = {
 502     .name = TYPE_SPAPR_TCE_TABLE,
 503     .parent = TYPE_DEVICE,
 504     .instance_size = sizeof(sPAPRTCETable),
 505     .class_init = spapr_tce_table_class_init,
 506 };
 507
 508 static void register_types(void)
 509 {
 510     type_register_static(&spapr_tce_table_info);
 511 }
 512
 513 type_init(register_types);