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 26 #include "hw/ppc/spapr.h" 27 28 #include <libfdt.h> 29 30 /* #define DEBUG_TCE */ 31 32 enum sPAPRTCEAccess { 33 SPAPR_TCE_FAULT = 0, 34 SPAPR_TCE_RO = 1, 35 SPAPR_TCE_WO = 2, 36 SPAPR_TCE_RW = 3, 37 }; 38 39 struct sPAPRTCETable { 40 uint32_t liobn; 41 uint32_t window_size; 42 sPAPRTCE *table; 43 bool bypass; 44 int fd; 45 MemoryRegion iommu; 46 QLIST_ENTRY(sPAPRTCETable) list; 47 }; 48 49 50 QLIST_HEAD(spapr_tce_tables, sPAPRTCETable) spapr_tce_tables; 51 52 static sPAPRTCETable *spapr_tce_find_by_liobn(uint32_t liobn) 53 { 54 sPAPRTCETable *tcet; 55 56 if (liobn & 0xFFFFFFFF00000000ULL) { 57 hcall_dprintf("Request for out-of-bounds LIOBN 0x" TARGET_FMT_lx "\n", 58 liobn); 59 return NULL; 60 } 61 62 QLIST_FOREACH(tcet, &spapr_tce_tables, list) { 63 if (tcet->liobn == liobn) { 64 return tcet; 65 } 66 } 67 68 return NULL; 69 } 70 71 static IOMMUTLBEntry spapr_tce_translate_iommu(MemoryRegion *iommu, hwaddr addr) 72 { 73 sPAPRTCETable *tcet = container_of(iommu, sPAPRTCETable, iommu); 74 uint64_t tce; 75 76 #ifdef DEBUG_TCE 77 fprintf(stderr, "spapr_tce_translate liobn=0x%" PRIx32 " addr=0x" 78 DMA_ADDR_FMT "\n", tcet->liobn, addr); 79 #endif 80 81 if (tcet->bypass) { 82 return (IOMMUTLBEntry) { 83 .target_as = &address_space_memory, 84 .iova = 0, 85 .translated_addr = 0, 86 .addr_mask = ~(hwaddr)0, 87 .perm = IOMMU_RW, 88 }; 89 } 90 91 /* Check if we are in bound */ 92 if (addr >= tcet->window_size) { 93 #ifdef DEBUG_TCE 94 fprintf(stderr, "spapr_tce_translate out of bounds\n"); 95 #endif 96 return (IOMMUTLBEntry) { .perm = IOMMU_NONE }; 97 } 98 99 tce = tcet->table[addr >> SPAPR_TCE_PAGE_SHIFT].tce; 100 101 #ifdef DEBUG_TCE 102 fprintf(stderr, " -> *paddr=0x%llx, *len=0x%llx\n", 103 (tce & ~SPAPR_TCE_PAGE_MASK), SPAPR_TCE_PAGE_MASK + 1); 104 #endif 105 106 return (IOMMUTLBEntry) { 107 .target_as = &address_space_memory, 108 .iova = addr & ~SPAPR_TCE_PAGE_MASK, 109 .translated_addr = tce & ~SPAPR_TCE_PAGE_MASK, 110 .addr_mask = SPAPR_TCE_PAGE_MASK, 111 .perm = tce, 112 }; 113 } 114 115 static MemoryRegionIOMMUOps spapr_iommu_ops = { 116 .translate = spapr_tce_translate_iommu, 117 }; 118 119 sPAPRTCETable *spapr_tce_new_table(uint32_t liobn, size_t window_size) 120 { 121 sPAPRTCETable *tcet; 122 123 if (spapr_tce_find_by_liobn(liobn)) { 124 fprintf(stderr, "Attempted to create TCE table with duplicate" 125 " LIOBN 0x%x\n", liobn); 126 return NULL; 127 } 128 129 if (!window_size) { 130 return NULL; 131 } 132 133 tcet = g_malloc0(sizeof(*tcet)); 134 tcet->liobn = liobn; 135 tcet->window_size = window_size; 136 137 if (kvm_enabled()) { 138 tcet->table = kvmppc_create_spapr_tce(liobn, 139 window_size, 140 &tcet->fd); 141 } 142 143 if (!tcet->table) { 144 size_t table_size = (window_size >> SPAPR_TCE_PAGE_SHIFT) 145 * sizeof(sPAPRTCE); 146 tcet->table = g_malloc0(table_size); 147 } 148 149 #ifdef DEBUG_TCE 150 fprintf(stderr, "spapr_iommu: New TCE table @ %p, liobn=0x%x, " 151 "table @ %p, fd=%d\n", tcet, liobn, tcet->table, tcet->fd); 152 #endif 153 154 memory_region_init_iommu(&tcet->iommu, &spapr_iommu_ops, 155 "iommu-spapr", UINT64_MAX); 156 157 QLIST_INSERT_HEAD(&spapr_tce_tables, tcet, list); 158 159 return tcet; 160 } 161 162 void spapr_tce_free(sPAPRTCETable *tcet) 163 { 164 QLIST_REMOVE(tcet, list); 165 166 if (!kvm_enabled() || 167 (kvmppc_remove_spapr_tce(tcet->table, tcet->fd, 168 tcet->window_size) != 0)) { 169 g_free(tcet->table); 170 } 171 172 g_free(tcet); 173 } 174 175 MemoryRegion *spapr_tce_get_iommu(sPAPRTCETable *tcet) 176 { 177 return &tcet->iommu; 178 } 179 180 void spapr_tce_set_bypass(sPAPRTCETable *tcet, bool bypass) 181 { 182 tcet->bypass = bypass; 183 } 184 185 void spapr_tce_reset(sPAPRTCETable *tcet) 186 { 187 size_t table_size = (tcet->window_size >> SPAPR_TCE_PAGE_SHIFT) 188 * sizeof(sPAPRTCE); 189 190 tcet->bypass = false; 191 memset(tcet->table, 0, table_size); 192 } 193 194 static target_ulong put_tce_emu(sPAPRTCETable *tcet, target_ulong ioba, 195 target_ulong tce) 196 { 197 sPAPRTCE *tcep; 198 IOMMUTLBEntry entry; 199 200 if (ioba >= tcet->window_size) { 201 hcall_dprintf("spapr_vio_put_tce on out-of-bounds IOBA 0x" 202 TARGET_FMT_lx "\n", ioba); 203 return H_PARAMETER; 204 } 205 206 tcep = tcet->table + (ioba >> SPAPR_TCE_PAGE_SHIFT); 207 tcep->tce = tce; 208 209 entry.target_as = &address_space_memory, 210 entry.iova = ioba & ~SPAPR_TCE_PAGE_MASK; 211 entry.translated_addr = tce & ~SPAPR_TCE_PAGE_MASK; 212 entry.addr_mask = SPAPR_TCE_PAGE_MASK; 213 entry.perm = tce; 214 memory_region_notify_iommu(&tcet->iommu, entry); 215 216 return H_SUCCESS; 217 } 218 219 static target_ulong h_put_tce(PowerPCCPU *cpu, sPAPREnvironment *spapr, 220 target_ulong opcode, target_ulong *args) 221 { 222 target_ulong liobn = args[0]; 223 target_ulong ioba = args[1]; 224 target_ulong tce = args[2]; 225 sPAPRTCETable *tcet = spapr_tce_find_by_liobn(liobn); 226 227 ioba &= ~(SPAPR_TCE_PAGE_SIZE - 1); 228 229 if (tcet) { 230 return put_tce_emu(tcet, ioba, tce); 231 } 232 #ifdef DEBUG_TCE 233 fprintf(stderr, "%s on liobn=" TARGET_FMT_lx /*%s*/ 234 " ioba 0x" TARGET_FMT_lx " TCE 0x" TARGET_FMT_lx "\n", 235 __func__, liobn, /*dev->qdev.id, */ioba, tce); 236 #endif 237 238 return H_PARAMETER; 239 } 240 241 void spapr_iommu_init(void) 242 { 243 QLIST_INIT(&spapr_tce_tables); 244 245 /* hcall-tce */ 246 spapr_register_hypercall(H_PUT_TCE, h_put_tce); 247 } 248 249 int spapr_dma_dt(void *fdt, int node_off, const char *propname, 250 uint32_t liobn, uint64_t window, uint32_t size) 251 { 252 uint32_t dma_prop[5]; 253 int ret; 254 255 dma_prop[0] = cpu_to_be32(liobn); 256 dma_prop[1] = cpu_to_be32(window >> 32); 257 dma_prop[2] = cpu_to_be32(window & 0xFFFFFFFF); 258 dma_prop[3] = 0; /* window size is 32 bits */ 259 dma_prop[4] = cpu_to_be32(size); 260 261 ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-address-cells", 2); 262 if (ret < 0) { 263 return ret; 264 } 265 266 ret = fdt_setprop_cell(fdt, node_off, "ibm,#dma-size-cells", 2); 267 if (ret < 0) { 268 return ret; 269 } 270 271 ret = fdt_setprop(fdt, node_off, propname, dma_prop, sizeof(dma_prop)); 272 if (ret < 0) { 273 return ret; 274 } 275 276 return 0; 277 } 278 279 int spapr_tcet_dma_dt(void *fdt, int node_off, const char *propname, 280 sPAPRTCETable *tcet) 281 { 282 if (!tcet) { 283 return 0; 284 } 285 286 return spapr_dma_dt(fdt, node_off, propname, 287 tcet->liobn, 0, tcet->window_size); 288 } 289