1 /* 2 * QEMU Sun4m iommu emulation 3 * 4 * Copyright (c) 2003-2005 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/irq.h" 27 #include "hw/qdev-properties.h" 28 #include "hw/sparc/sun4m_iommu.h" 29 #include "hw/sysbus.h" 30 #include "migration/vmstate.h" 31 #include "qemu/module.h" 32 #include "exec/address-spaces.h" 33 #include "trace.h" 34 35 /* 36 * I/O MMU used by Sun4m systems 37 * 38 * Chipset docs: 39 * "Sun-4M System Architecture (revision 2.0) by Chuck Narad", 950-1373-01, 40 * http://mediacast.sun.com/users/Barton808/media/Sun4M_SystemArchitecture_edited2.pdf 41 */ 42 43 #define IOMMU_CTRL (0x0000 >> 2) 44 #define IOMMU_CTRL_IMPL 0xf0000000 /* Implementation */ 45 #define IOMMU_CTRL_VERS 0x0f000000 /* Version */ 46 #define IOMMU_CTRL_RNGE 0x0000001c /* Mapping RANGE */ 47 #define IOMMU_RNGE_16MB 0x00000000 /* 0xff000000 -> 0xffffffff */ 48 #define IOMMU_RNGE_32MB 0x00000004 /* 0xfe000000 -> 0xffffffff */ 49 #define IOMMU_RNGE_64MB 0x00000008 /* 0xfc000000 -> 0xffffffff */ 50 #define IOMMU_RNGE_128MB 0x0000000c /* 0xf8000000 -> 0xffffffff */ 51 #define IOMMU_RNGE_256MB 0x00000010 /* 0xf0000000 -> 0xffffffff */ 52 #define IOMMU_RNGE_512MB 0x00000014 /* 0xe0000000 -> 0xffffffff */ 53 #define IOMMU_RNGE_1GB 0x00000018 /* 0xc0000000 -> 0xffffffff */ 54 #define IOMMU_RNGE_2GB 0x0000001c /* 0x80000000 -> 0xffffffff */ 55 #define IOMMU_CTRL_ENAB 0x00000001 /* IOMMU Enable */ 56 #define IOMMU_CTRL_MASK 0x0000001d 57 58 #define IOMMU_BASE (0x0004 >> 2) 59 #define IOMMU_BASE_MASK 0x07fffc00 60 61 #define IOMMU_TLBFLUSH (0x0014 >> 2) 62 #define IOMMU_TLBFLUSH_MASK 0xffffffff 63 64 #define IOMMU_PGFLUSH (0x0018 >> 2) 65 #define IOMMU_PGFLUSH_MASK 0xffffffff 66 67 #define IOMMU_AFSR (0x1000 >> 2) 68 #define IOMMU_AFSR_ERR 0x80000000 /* LE, TO, or BE asserted */ 69 #define IOMMU_AFSR_LE 0x40000000 /* SBUS reports error after 70 transaction */ 71 #define IOMMU_AFSR_TO 0x20000000 /* Write access took more than 72 12.8 us. */ 73 #define IOMMU_AFSR_BE 0x10000000 /* Write access received error 74 acknowledge */ 75 #define IOMMU_AFSR_SIZE 0x0e000000 /* Size of transaction causing error */ 76 #define IOMMU_AFSR_S 0x01000000 /* Sparc was in supervisor mode */ 77 #define IOMMU_AFSR_RESV 0x00800000 /* Reserved, forced to 0x8 by 78 hardware */ 79 #define IOMMU_AFSR_ME 0x00080000 /* Multiple errors occurred */ 80 #define IOMMU_AFSR_RD 0x00040000 /* A read operation was in progress */ 81 #define IOMMU_AFSR_FAV 0x00020000 /* IOMMU afar has valid contents */ 82 #define IOMMU_AFSR_MASK 0xff0fffff 83 84 #define IOMMU_AFAR (0x1004 >> 2) 85 86 #define IOMMU_AER (0x1008 >> 2) /* Arbiter Enable Register */ 87 #define IOMMU_AER_EN_P0_ARB 0x00000001 /* MBus master 0x8 (Always 1) */ 88 #define IOMMU_AER_EN_P1_ARB 0x00000002 /* MBus master 0x9 */ 89 #define IOMMU_AER_EN_P2_ARB 0x00000004 /* MBus master 0xa */ 90 #define IOMMU_AER_EN_P3_ARB 0x00000008 /* MBus master 0xb */ 91 #define IOMMU_AER_EN_0 0x00010000 /* SBus slot 0 */ 92 #define IOMMU_AER_EN_1 0x00020000 /* SBus slot 1 */ 93 #define IOMMU_AER_EN_2 0x00040000 /* SBus slot 2 */ 94 #define IOMMU_AER_EN_3 0x00080000 /* SBus slot 3 */ 95 #define IOMMU_AER_EN_F 0x00100000 /* SBus on-board */ 96 #define IOMMU_AER_SBW 0x80000000 /* S-to-M asynchronous writes */ 97 #define IOMMU_AER_MASK 0x801f000f 98 99 #define IOMMU_SBCFG0 (0x1010 >> 2) /* SBUS configration per-slot */ 100 #define IOMMU_SBCFG1 (0x1014 >> 2) /* SBUS configration per-slot */ 101 #define IOMMU_SBCFG2 (0x1018 >> 2) /* SBUS configration per-slot */ 102 #define IOMMU_SBCFG3 (0x101c >> 2) /* SBUS configration per-slot */ 103 #define IOMMU_SBCFG_SAB30 0x00010000 /* Phys-address bit 30 when 104 bypass enabled */ 105 #define IOMMU_SBCFG_BA16 0x00000004 /* Slave supports 16 byte bursts */ 106 #define IOMMU_SBCFG_BA8 0x00000002 /* Slave supports 8 byte bursts */ 107 #define IOMMU_SBCFG_BYPASS 0x00000001 /* Bypass IOMMU, treat all addresses 108 produced by this device as pure 109 physical. */ 110 #define IOMMU_SBCFG_MASK 0x00010003 111 112 #define IOMMU_ARBEN (0x2000 >> 2) /* SBUS arbitration enable */ 113 #define IOMMU_ARBEN_MASK 0x001f0000 114 #define IOMMU_MID 0x00000008 115 116 #define IOMMU_MASK_ID (0x3018 >> 2) /* Mask ID */ 117 #define IOMMU_MASK_ID_MASK 0x00ffffff 118 119 #define IOMMU_MSII_MASK 0x26000000 /* microSPARC II mask number */ 120 #define IOMMU_TS_MASK 0x23000000 /* turboSPARC mask number */ 121 122 /* The format of an iopte in the page tables */ 123 #define IOPTE_PAGE 0xffffff00 /* Physical page number (PA[35:12]) */ 124 #define IOPTE_CACHE 0x00000080 /* Cached (in vme IOCACHE or 125 Viking/MXCC) */ 126 #define IOPTE_WRITE 0x00000004 /* Writable */ 127 #define IOPTE_VALID 0x00000002 /* IOPTE is valid */ 128 #define IOPTE_WAZ 0x00000001 /* Write as zeros */ 129 130 #define IOMMU_PAGE_SHIFT 12 131 #define IOMMU_PAGE_SIZE (1 << IOMMU_PAGE_SHIFT) 132 #define IOMMU_PAGE_MASK (~(IOMMU_PAGE_SIZE - 1)) 133 134 static uint64_t iommu_mem_read(void *opaque, hwaddr addr, 135 unsigned size) 136 { 137 IOMMUState *s = opaque; 138 hwaddr saddr; 139 uint32_t ret; 140 141 saddr = addr >> 2; 142 switch (saddr) { 143 default: 144 ret = s->regs[saddr]; 145 break; 146 case IOMMU_AFAR: 147 case IOMMU_AFSR: 148 ret = s->regs[saddr]; 149 qemu_irq_lower(s->irq); 150 break; 151 } 152 trace_sun4m_iommu_mem_readl(saddr, ret); 153 return ret; 154 } 155 156 static void iommu_mem_write(void *opaque, hwaddr addr, 157 uint64_t val, unsigned size) 158 { 159 IOMMUState *s = opaque; 160 hwaddr saddr; 161 162 saddr = addr >> 2; 163 trace_sun4m_iommu_mem_writel(saddr, val); 164 switch (saddr) { 165 case IOMMU_CTRL: 166 switch (val & IOMMU_CTRL_RNGE) { 167 case IOMMU_RNGE_16MB: 168 s->iostart = 0xffffffffff000000ULL; 169 break; 170 case IOMMU_RNGE_32MB: 171 s->iostart = 0xfffffffffe000000ULL; 172 break; 173 case IOMMU_RNGE_64MB: 174 s->iostart = 0xfffffffffc000000ULL; 175 break; 176 case IOMMU_RNGE_128MB: 177 s->iostart = 0xfffffffff8000000ULL; 178 break; 179 case IOMMU_RNGE_256MB: 180 s->iostart = 0xfffffffff0000000ULL; 181 break; 182 case IOMMU_RNGE_512MB: 183 s->iostart = 0xffffffffe0000000ULL; 184 break; 185 case IOMMU_RNGE_1GB: 186 s->iostart = 0xffffffffc0000000ULL; 187 break; 188 default: 189 case IOMMU_RNGE_2GB: 190 s->iostart = 0xffffffff80000000ULL; 191 break; 192 } 193 trace_sun4m_iommu_mem_writel_ctrl(s->iostart); 194 s->regs[saddr] = ((val & IOMMU_CTRL_MASK) | s->version); 195 break; 196 case IOMMU_BASE: 197 s->regs[saddr] = val & IOMMU_BASE_MASK; 198 break; 199 case IOMMU_TLBFLUSH: 200 trace_sun4m_iommu_mem_writel_tlbflush(val); 201 s->regs[saddr] = val & IOMMU_TLBFLUSH_MASK; 202 break; 203 case IOMMU_PGFLUSH: 204 trace_sun4m_iommu_mem_writel_pgflush(val); 205 s->regs[saddr] = val & IOMMU_PGFLUSH_MASK; 206 break; 207 case IOMMU_AFAR: 208 s->regs[saddr] = val; 209 qemu_irq_lower(s->irq); 210 break; 211 case IOMMU_AER: 212 s->regs[saddr] = (val & IOMMU_AER_MASK) | IOMMU_AER_EN_P0_ARB; 213 break; 214 case IOMMU_AFSR: 215 s->regs[saddr] = (val & IOMMU_AFSR_MASK) | IOMMU_AFSR_RESV; 216 qemu_irq_lower(s->irq); 217 break; 218 case IOMMU_SBCFG0: 219 case IOMMU_SBCFG1: 220 case IOMMU_SBCFG2: 221 case IOMMU_SBCFG3: 222 s->regs[saddr] = val & IOMMU_SBCFG_MASK; 223 break; 224 case IOMMU_ARBEN: 225 /* XXX implement SBus probing: fault when reading unmapped 226 addresses, fault cause and address stored to MMU/IOMMU */ 227 s->regs[saddr] = (val & IOMMU_ARBEN_MASK) | IOMMU_MID; 228 break; 229 case IOMMU_MASK_ID: 230 s->regs[saddr] |= val & IOMMU_MASK_ID_MASK; 231 break; 232 default: 233 s->regs[saddr] = val; 234 break; 235 } 236 } 237 238 static const MemoryRegionOps iommu_mem_ops = { 239 .read = iommu_mem_read, 240 .write = iommu_mem_write, 241 .endianness = DEVICE_NATIVE_ENDIAN, 242 .valid = { 243 .min_access_size = 4, 244 .max_access_size = 4, 245 }, 246 }; 247 248 static uint32_t iommu_page_get_flags(IOMMUState *s, hwaddr addr) 249 { 250 uint32_t ret; 251 hwaddr iopte; 252 hwaddr pa = addr; 253 254 iopte = s->regs[IOMMU_BASE] << 4; 255 addr &= ~s->iostart; 256 iopte += (addr >> (IOMMU_PAGE_SHIFT - 2)) & ~3; 257 ret = address_space_ldl_be(&address_space_memory, iopte, 258 MEMTXATTRS_UNSPECIFIED, NULL); 259 trace_sun4m_iommu_page_get_flags(pa, iopte, ret); 260 return ret; 261 } 262 263 static hwaddr iommu_translate_pa(hwaddr addr, 264 uint32_t pte) 265 { 266 hwaddr pa; 267 268 pa = ((pte & IOPTE_PAGE) << 4) + (addr & ~IOMMU_PAGE_MASK); 269 trace_sun4m_iommu_translate_pa(addr, pa, pte); 270 return pa; 271 } 272 273 static void iommu_bad_addr(IOMMUState *s, hwaddr addr, 274 int is_write) 275 { 276 trace_sun4m_iommu_bad_addr(addr); 277 s->regs[IOMMU_AFSR] = IOMMU_AFSR_ERR | IOMMU_AFSR_LE | IOMMU_AFSR_RESV | 278 IOMMU_AFSR_FAV; 279 if (!is_write) { 280 s->regs[IOMMU_AFSR] |= IOMMU_AFSR_RD; 281 } 282 s->regs[IOMMU_AFAR] = addr; 283 qemu_irq_raise(s->irq); 284 } 285 286 /* Called from RCU critical section */ 287 static IOMMUTLBEntry sun4m_translate_iommu(IOMMUMemoryRegion *iommu, 288 hwaddr addr, 289 IOMMUAccessFlags flags, 290 int iommu_idx) 291 { 292 IOMMUState *is = container_of(iommu, IOMMUState, iommu); 293 hwaddr page, pa; 294 int is_write = (flags & IOMMU_WO) ? 1 : 0; 295 uint32_t pte; 296 IOMMUTLBEntry ret = { 297 .target_as = &address_space_memory, 298 .iova = 0, 299 .translated_addr = 0, 300 .addr_mask = ~(hwaddr)0, 301 .perm = IOMMU_NONE, 302 }; 303 304 page = addr & IOMMU_PAGE_MASK; 305 pte = iommu_page_get_flags(is, page); 306 if (!(pte & IOPTE_VALID)) { 307 iommu_bad_addr(is, page, is_write); 308 return ret; 309 } 310 311 pa = iommu_translate_pa(addr, pte); 312 if (is_write && !(pte & IOPTE_WRITE)) { 313 iommu_bad_addr(is, page, is_write); 314 return ret; 315 } 316 317 if (pte & IOPTE_WRITE) { 318 ret.perm = IOMMU_RW; 319 } else { 320 ret.perm = IOMMU_RO; 321 } 322 323 ret.iova = page; 324 ret.translated_addr = pa; 325 ret.addr_mask = ~IOMMU_PAGE_MASK; 326 327 return ret; 328 } 329 330 static const VMStateDescription vmstate_iommu = { 331 .name = "iommu", 332 .version_id = 2, 333 .minimum_version_id = 2, 334 .fields = (VMStateField[]) { 335 VMSTATE_UINT32_ARRAY(regs, IOMMUState, IOMMU_NREGS), 336 VMSTATE_UINT64(iostart, IOMMUState), 337 VMSTATE_END_OF_LIST() 338 } 339 }; 340 341 static void iommu_reset(DeviceState *d) 342 { 343 IOMMUState *s = SUN4M_IOMMU(d); 344 345 memset(s->regs, 0, IOMMU_NREGS * 4); 346 s->iostart = 0; 347 s->regs[IOMMU_CTRL] = s->version; 348 s->regs[IOMMU_ARBEN] = IOMMU_MID; 349 s->regs[IOMMU_AFSR] = IOMMU_AFSR_RESV; 350 s->regs[IOMMU_AER] = IOMMU_AER_EN_P0_ARB | IOMMU_AER_EN_P1_ARB; 351 s->regs[IOMMU_MASK_ID] = IOMMU_TS_MASK; 352 } 353 354 static void iommu_init(Object *obj) 355 { 356 IOMMUState *s = SUN4M_IOMMU(obj); 357 SysBusDevice *dev = SYS_BUS_DEVICE(obj); 358 359 memory_region_init_iommu(&s->iommu, sizeof(s->iommu), 360 TYPE_SUN4M_IOMMU_MEMORY_REGION, OBJECT(dev), 361 "iommu-sun4m", UINT64_MAX); 362 address_space_init(&s->iommu_as, MEMORY_REGION(&s->iommu), "iommu-as"); 363 364 sysbus_init_irq(dev, &s->irq); 365 366 memory_region_init_io(&s->iomem, obj, &iommu_mem_ops, s, "iommu", 367 IOMMU_NREGS * sizeof(uint32_t)); 368 sysbus_init_mmio(dev, &s->iomem); 369 } 370 371 static Property iommu_properties[] = { 372 DEFINE_PROP_UINT32("version", IOMMUState, version, 0), 373 DEFINE_PROP_END_OF_LIST(), 374 }; 375 376 static void iommu_class_init(ObjectClass *klass, void *data) 377 { 378 DeviceClass *dc = DEVICE_CLASS(klass); 379 380 dc->reset = iommu_reset; 381 dc->vmsd = &vmstate_iommu; 382 dc->props = iommu_properties; 383 } 384 385 static const TypeInfo iommu_info = { 386 .name = TYPE_SUN4M_IOMMU, 387 .parent = TYPE_SYS_BUS_DEVICE, 388 .instance_size = sizeof(IOMMUState), 389 .instance_init = iommu_init, 390 .class_init = iommu_class_init, 391 }; 392 393 static void sun4m_iommu_memory_region_class_init(ObjectClass *klass, void *data) 394 { 395 IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_CLASS(klass); 396 397 imrc->translate = sun4m_translate_iommu; 398 } 399 400 static const TypeInfo sun4m_iommu_memory_region_info = { 401 .parent = TYPE_IOMMU_MEMORY_REGION, 402 .name = TYPE_SUN4M_IOMMU_MEMORY_REGION, 403 .class_init = sun4m_iommu_memory_region_class_init, 404 }; 405 406 static void iommu_register_types(void) 407 { 408 type_register_static(&iommu_info); 409 type_register_static(&sun4m_iommu_memory_region_info); 410 } 411 412 type_init(iommu_register_types) 413