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 "hw/hw.h"
  20 #include "sysemu/kvm.h"
  21 #include "hw/qdev.h"
  22 #include "kvm_ppc.h"
  23 #include "sysemu/dma.h"
  24 #include "exec/address-spaces.h"
  25 #include "trace.h"
  26
  27 #include "hw/ppc/spapr.h"
  28
  29 #include <libfdt.h>
  30
  31 enum sPAPRTCEAccess {
  32     SPAPR_TCE_FAULT = 0,
  33     SPAPR_TCE_RO = 1,
  34     SPAPR_TCE_WO = 2,
  35     SPAPR_TCE_RW = 3,
  36 };
  37
  38 QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables;
  39
  40 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn)
  41 {
  42     sPAPRTCETable *tcet;
  43
  44     if (liobn & 0xFFFFFFFF00000000ULL) {
  45         hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n",
  46                       liobn);
  47         return NULL;
  48     }
  49
  50     QLIST_FOREACH(tcet, &spapr_tce_tables, list) {
  51         if (tcet->liobn == liobn) {
  52             return tcet;
  53         }
  54     }
  55
  56     return NULL;
  57 }
  58
  59 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr)
  60 {
  61     sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu);
  62     uint64_t tce;
  63     IOMMUTLBEntry ret = {
  64         .target_as = &address_space_memory,
  65         .iova = 0,
  66         .translated_addr = 0,
  67         .addr_mask = ~(hwaddr)0,
  68         .perm = IOMMU_NONE,
  69     };
  70
  71     if (tcet->bypass) {
  72         ret.perm = IOMMU_RW;
  73     } else if (addr < tcet->window_size) {
  74         /* Check if we are in bound */
  75         tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT];
  76         ret.iova = addr & ~SPAPR_TCE_PAGE_MASK;
  77         ret.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
  78         ret.addr_mask = SPAPR_TCE_PAGE_MASK;
  79         ret.perm = tce;
  80     }
  81     trace_spapr_iommu_xlate(tcet->liobn, addr, ret.iova, ret.perm,
  82                             ret.addr_mask);
  83
  84     return ret;
  85 }
  86
  87 static int spapr_tce_table_pre_load(void *opaque)
  88 {
  89     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(opaque);
  90
  91     tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;
  92
  93     return 0;
  94 }
  95
  96 static const VMStateDescription vmstate_spapr_tce_table = {
  97     .name = "spapr_iommu",
  98     .version_id = 1,
  99     .minimum_version_id = 1,
 100     .minimum_version_id_old = 1,
 101     .pre_load = spapr_tce_table_pre_load,
 102     .fields      = (VMStateField []) {
 103         /* Sanity check */
 104         VMSTATE_UINT32_EQUAL(liobn, sPAPRTCETable),
 105         VMSTATE_UINT32_EQUAL(window_size, sPAPRTCETable),
 106
 107         /* IOMMU state */
 108         VMSTATE_BOOL(bypass, sPAPRTCETable),
 109         VMSTATE_VARRAY_UINT32(table, sPAPRTCETable, nb_table, 0, vmstate_info_uint64, uint64_t),
 110
 111         VMSTATE_END_OF_LIST()
 112     },
 113 };
 114
 115 static MemoryRegionIOMMUOps spapr_iommu_ops = {
 116     .translate = spapr_tce_translate_iommu,
 117 };
 118
 119 static int spapr_tce_table_realize(DeviceState *dev)
 120 {
 121     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 122
 123     if (kvm_enabled()) {
 124         tcet->table = kvmppc_create_spapr_tce(tcet->liobn,
 125                                               tcet->window_size,
 126                                               &tcet->fd);
 127     }
 128
 129     if (!tcet->table) {
 130         size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
 131             * sizeof(uint64_t);
 132         tcet->table = g_malloc0(table_size);
 133     }
 134     tcet->nb_table = tcet->window_size >> SPAPR_TCE_PAGE_SHIFT;
 135
 136     trace_spapr_iommu_new_table(tcet->liobn, tcet, tcet->table, tcet->fd);
 137
 138     memory_region_init_iommu(&tcet->iommu, OBJECT(dev), &spapr_iommu_ops,
 139                              "iommu-spapr", UINT64_MAX);
 140
 141     QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list);
 142
 143     return 0;
 144 }
 145
 146 sPAPRTCETable *spapr_tce_new_table(DeviceState *owner, uint32_t liobn, size_t window_size)
 147 {
 148     sPAPRTCETable *tcet;
 149
 150     if (spapr_tce_find_by_liobn(liobn)) {
 151         fprintf(stderr, "Attempted to create TCE table with duplicate"
 152                 " LIOBN 0x%x\n", liobn);
 153         return NULL;
 154     }
 155
 156     if (!window_size) {
 157         return NULL;
 158     }
 159
 160     tcet = SPAPR_TCE_TABLE(object_new(TYPE_SPAPR_TCE_TABLE));
 161     tcet->liobn = liobn;
 162     tcet->window_size = window_size;
 163
 164     object_property_add_child(OBJECT(owner), "tce-table", OBJECT(tcet), NULL);
 165
 166     qdev_init_nofail(DEVICE(tcet));
 167
 168     return tcet;
 169 }
 170
 171 static void spapr_tce_table_finalize(Object *obj)
 172 {
 173     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(obj);
 174
 175     QLIST_REMOVE(tcet, list);
 176
 177     if (!kvm_enabled() ||
 178         (kvmppc_remove_spapr_tce(tcet->table, tcet->fd,
 179                                  tcet->window_size) != 0)) {
 180         g_free(tcet->table);
 181     }
 182 }
 183
 184 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet)
 185 {
 186     return &tcet->iommu;
 187 }
 188
 189 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass)
 190 {
 191     tcet->bypass = bypass;
 192 }
 193
 194 static void spapr_tce_reset(DeviceState *dev)
 195 {
 196     sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev);
 197     size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT)
 198         * sizeof(uint64_t);
 199
 200     tcet->bypass = false;
 201     memset(tcet->table, 0, table_size);
 202 }
 203
 204 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba,
 205                                 target_ulong tce)
 206 {
 207     IOMMUTLBEntry entry;
 208
 209     if (ioba >= tcet->window_size) {
 210         hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x"
 211                       TARGET_FMT_lx "\n", ioba);
 212         return H_PARAMETER;
 213     }
 214
 215     tcet->table[ioba >> SPAPR_TCE_PAGE_SHIFT] = tce;
 216
 217     entry.target_as = &address_space_memory,
 218     entry.iova = ioba & ~SPAPR_TCE_PAGE_MASK;
 219     entry.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK;
 220     entry.addr_mask = SPAPR_TCE_PAGE_MASK;
 221     entry.perm = tce;
 222     memory_region_notify_iommu(&tcet->iommu, entry);
 223
 224     return H_SUCCESS;
 225 }
 226
 227 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr,
 228                               target_ulong opcode, target_ulong *args)
 229 {
 230     target_ulong liobn = args[0];
 231     target_ulong ioba = args[1];
 232     target_ulong tce = args[2];
 233     target_ulong ret = H_PARAMETER;
 234     sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn);
 235
 236     ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1);
 237
 238     if (tcet) {
 239         ret = put_tce_emu(tcet, ioba, tce);
 240     }
 241     trace_spapr_iommu_put(liobn, ioba, tce, ret);
 242
 243     return ret;
 244 }
 245
 246 int spapr_dma_dt(void *fdt, int node_off, const char *propname,
 247                  uint32_t liobn, uint64_t window, uint32_t size)
 248 {
 249     uint32_t dma_prop[5];
 250     int ret;
 251
 252     dma_prop[0] = cpu_to_be32(liobn);
 253     dma_prop[1] = cpu_to_be32(window >> 32);
 254     dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF);
 255     dma_prop[3] = 0; /* window size is 32 bits */
 256     dma_prop[4] = cpu_to_be32(size);
 257
 258     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2);
 259     if (ret < 0) {
 260         return ret;
 261     }
 262
 263     ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2);
 264     if (ret < 0) {
 265         return ret;
 266     }
 267
 268     ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop));
 269     if (ret < 0) {
 270         return ret;
 271     }
 272
 273     return 0;
 274 }
 275
 276 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname,
 277                       sPAPRTCETable *tcet)
 278 {
 279     if (!tcet) {
 280         return 0;
 281     }
 282
 283     return spapr_dma_dt(fdt, node_off, propname,
 284                         tcet->liobn, 0, tcet->window_size);
 285 }
 286
 287 static void spapr_tce_table_class_init(ObjectClass *klass, void *data)
 288 {
 289     DeviceClass *dc = DEVICE_CLASS(klass);
 290     dc->vmsd = &vmstate_spapr_tce_table;
 291     dc->init = spapr_tce_table_realize;
 292     dc->reset = spapr_tce_reset;
 293
 294     QLIST_INIT(&spapr_tce_tables);
 295
 296     /* hcall-tce */
 297     spapr_register_hypercall(H_PUT_TCE, h_put_tce);
 298 }
 299
 300 static TypeInfo spapr_tce_table_info = {
 301     .name = TYPE_SPAPR_TCE_TABLE,
 302     .parent = TYPE_DEVICE,
 303     .instance_size = sizeof(sPAPRTCETable),
 304     .class_init = spapr_tce_table_class_init,
 305     .instance_finalize = spapr_tce_table_finalize,
 306 };
 307
 308 static void register_types(void)
 309 {
 310     type_register_static(&spapr_tce_table_info);
 311 }
 312
 313 type_init(register_types);