1 /* 2 * QEMU sPAPR Dynamic DMA windows support 3 * 4 * Copyright (c) 2015 Alexey Kardashevskiy, IBM Corporation. 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, 9 * or (at your option) any later version. 10 * 11 * This program 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 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/error-report.h" 22 #include "qemu/module.h" 23 #include "hw/ppc/spapr.h" 24 #include "hw/pci-host/spapr.h" 25 #include "trace.h" 26 27 static int spapr_phb_get_active_win_num_cb(Object *child, void *opaque) 28 { 29 SpaprTceTable *tcet; 30 31 tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); 32 if (tcet && tcet->nb_table) { 33 ++*(unsigned *)opaque; 34 } 35 return 0; 36 } 37 38 static unsigned spapr_phb_get_active_win_num(SpaprPhbState *sphb) 39 { 40 unsigned ret = 0; 41 42 object_child_foreach(OBJECT(sphb), spapr_phb_get_active_win_num_cb, &ret); 43 44 return ret; 45 } 46 47 static int spapr_phb_get_free_liobn_cb(Object *child, void *opaque) 48 { 49 SpaprTceTable *tcet; 50 51 tcet = (SpaprTceTable *) object_dynamic_cast(child, TYPE_SPAPR_TCE_TABLE); 52 if (tcet && !tcet->nb_table) { 53 *(uint32_t *)opaque = tcet->liobn; 54 return 1; 55 } 56 return 0; 57 } 58 59 static unsigned spapr_phb_get_free_liobn(SpaprPhbState *sphb) 60 { 61 uint32_t liobn = 0; 62 63 object_child_foreach(OBJECT(sphb), spapr_phb_get_free_liobn_cb, &liobn); 64 65 return liobn; 66 } 67 68 static uint32_t spapr_page_mask_to_query_mask(uint64_t page_mask) 69 { 70 int i; 71 uint32_t mask = 0; 72 const struct { int shift; uint32_t mask; } masks[] = { 73 { 12, RTAS_DDW_PGSIZE_4K }, 74 { 16, RTAS_DDW_PGSIZE_64K }, 75 { 21, RTAS_DDW_PGSIZE_2M }, 76 { 24, RTAS_DDW_PGSIZE_16M }, 77 { 25, RTAS_DDW_PGSIZE_32M }, 78 { 26, RTAS_DDW_PGSIZE_64M }, 79 { 27, RTAS_DDW_PGSIZE_128M }, 80 { 28, RTAS_DDW_PGSIZE_256M }, 81 { 34, RTAS_DDW_PGSIZE_16G }, 82 }; 83 84 for (i = 0; i < ARRAY_SIZE(masks); ++i) { 85 if (page_mask & (1ULL << masks[i].shift)) { 86 mask |= masks[i].mask; 87 } 88 } 89 90 return mask; 91 } 92 93 static void rtas_ibm_query_pe_dma_window(PowerPCCPU *cpu, 94 SpaprMachineState *spapr, 95 uint32_t token, uint32_t nargs, 96 target_ulong args, 97 uint32_t nret, target_ulong rets) 98 { 99 SpaprPhbState *sphb; 100 uint64_t buid; 101 uint32_t avail, addr, pgmask = 0; 102 103 if ((nargs != 3) || (nret != 5)) { 104 goto param_error_exit; 105 } 106 107 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 108 addr = rtas_ld(args, 0); 109 sphb = spapr_pci_find_phb(spapr, buid); 110 if (!sphb || !sphb->ddw_enabled) { 111 goto param_error_exit; 112 } 113 114 /* Translate page mask to LoPAPR format */ 115 pgmask = spapr_page_mask_to_query_mask(sphb->page_size_mask); 116 117 avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb); 118 119 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 120 rtas_st(rets, 1, avail); 121 rtas_st(rets, 2, 0x80000000); /* The largest window we can possibly have */ 122 rtas_st(rets, 3, pgmask); 123 rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ 124 125 trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask); 126 return; 127 128 param_error_exit: 129 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 130 } 131 132 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, 133 SpaprMachineState *spapr, 134 uint32_t token, uint32_t nargs, 135 target_ulong args, 136 uint32_t nret, target_ulong rets) 137 { 138 SpaprPhbState *sphb; 139 SpaprTceTable *tcet = NULL; 140 uint32_t addr, page_shift, window_shift, liobn; 141 uint64_t buid, win_addr; 142 int windows; 143 144 if ((nargs != 5) || (nret != 4)) { 145 goto param_error_exit; 146 } 147 148 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 149 addr = rtas_ld(args, 0); 150 sphb = spapr_pci_find_phb(spapr, buid); 151 if (!sphb || !sphb->ddw_enabled) { 152 goto param_error_exit; 153 } 154 155 page_shift = rtas_ld(args, 3); 156 window_shift = rtas_ld(args, 4); 157 liobn = spapr_phb_get_free_liobn(sphb); 158 windows = spapr_phb_get_active_win_num(sphb); 159 160 if (!(sphb->page_size_mask & (1ULL << page_shift)) || 161 (window_shift < page_shift)) { 162 goto param_error_exit; 163 } 164 165 if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { 166 goto hw_error_exit; 167 } 168 169 tcet = spapr_tce_find_by_liobn(liobn); 170 if (!tcet) { 171 goto hw_error_exit; 172 } 173 174 win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; 175 /* 176 * We have just created a window, we know for the fact that it is empty, 177 * use a hack to avoid iterating over the table as it is quite possible 178 * to have billions of TCEs, all empty. 179 * Note that we cannot delay this to the first H_PUT_TCE as this hcall is 180 * mostly likely to be handled in KVM so QEMU just does not know if it 181 * happened. 182 */ 183 tcet->skipping_replay = true; 184 spapr_tce_table_enable(tcet, page_shift, win_addr, 185 1ULL << (window_shift - page_shift)); 186 tcet->skipping_replay = false; 187 if (!tcet->nb_table) { 188 goto hw_error_exit; 189 } 190 191 trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, 192 1ULL << window_shift, tcet->bus_offset, liobn); 193 194 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 195 rtas_st(rets, 1, liobn); 196 rtas_st(rets, 2, tcet->bus_offset >> 32); 197 rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); 198 199 return; 200 201 hw_error_exit: 202 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 203 return; 204 205 param_error_exit: 206 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 207 } 208 209 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, 210 SpaprMachineState *spapr, 211 uint32_t token, uint32_t nargs, 212 target_ulong args, 213 uint32_t nret, target_ulong rets) 214 { 215 SpaprPhbState *sphb; 216 SpaprTceTable *tcet; 217 uint32_t liobn; 218 bool def_win_removed; 219 220 if ((nargs != 1) || (nret != 1)) { 221 goto param_error_exit; 222 } 223 224 liobn = rtas_ld(args, 0); 225 tcet = spapr_tce_find_by_liobn(liobn); 226 if (!tcet) { 227 goto param_error_exit; 228 } 229 230 sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); 231 if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { 232 goto param_error_exit; 233 } 234 235 def_win_removed = tcet->def_win; 236 spapr_tce_table_disable(tcet); 237 trace_spapr_iommu_ddw_remove(liobn); 238 239 /* 240 * PAPR+/LoPAPR says: 241 * The platform must restore the default DMA window for the PE on a call 242 * to the ibm,remove-pe-dma-window RTAS call when all of the following 243 * are true: 244 * a. The call removes the last DMA window remaining for the PE. 245 * b. The DMA window being removed is not the default window 246 */ 247 if (spapr_phb_get_active_win_num(sphb) == 0 && !def_win_removed) { 248 spapr_phb_dma_reset(sphb); 249 trace_spapr_iommu_ddw_reset(sphb->buid, 0); 250 } 251 252 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 253 return; 254 255 param_error_exit: 256 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 257 } 258 259 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, 260 SpaprMachineState *spapr, 261 uint32_t token, uint32_t nargs, 262 target_ulong args, 263 uint32_t nret, target_ulong rets) 264 { 265 SpaprPhbState *sphb; 266 uint64_t buid; 267 uint32_t addr; 268 269 if ((nargs != 3) || (nret != 1)) { 270 goto param_error_exit; 271 } 272 273 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 274 addr = rtas_ld(args, 0); 275 sphb = spapr_pci_find_phb(spapr, buid); 276 if (!sphb || !sphb->ddw_enabled) { 277 goto param_error_exit; 278 } 279 280 spapr_phb_dma_reset(sphb); 281 trace_spapr_iommu_ddw_reset(buid, addr); 282 283 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 284 285 return; 286 287 param_error_exit: 288 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 289 } 290 291 static void spapr_rtas_ddw_init(void) 292 { 293 spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, 294 "ibm,query-pe-dma-window", 295 rtas_ibm_query_pe_dma_window); 296 spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, 297 "ibm,create-pe-dma-window", 298 rtas_ibm_create_pe_dma_window); 299 spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, 300 "ibm,remove-pe-dma-window", 301 rtas_ibm_remove_pe_dma_window); 302 spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, 303 "ibm,reset-pe-dma-window", 304 rtas_ibm_reset_pe_dma_window); 305 } 306 307 type_init(spapr_rtas_ddw_init) 308