| 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) && (nret != 6))) { |
| 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 | if (nret == 6) { |
| 122 | /* |
| 123 | * Set the Max TCE number as 1<<(58-21) = 0x20.0000.0000 |
| 124 | * 1<<59 is the huge window start and 21 is 2M page shift. |
| 125 | */ |
| 126 | rtas_st(rets, 2, 0x00000020); |
| 127 | rtas_st(rets, 3, 0x00000000); |
| 128 | rtas_st(rets, 4, pgmask); |
| 129 | rtas_st(rets, 5, 0); /* DMA migration mask, not supported */ |
| 130 | } else { |
| 131 | rtas_st(rets, 2, 0x80000000); |
| 132 | rtas_st(rets, 3, pgmask); |
| 133 | rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ |
| 134 | } |
| 135 | |
| 136 | trace_spapr_iommu_ddw_query(buid, addr, avail, 0x80000000, pgmask); |
| 137 | return; |
| 138 | |
| 139 | param_error_exit: |
| 140 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| 141 | } |
| 142 | |
| 143 | static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, |
| 144 | SpaprMachineState *spapr, |
| 145 | uint32_t token, uint32_t nargs, |
| 146 | target_ulong args, |
| 147 | uint32_t nret, target_ulong rets) |
| 148 | { |
| 149 | SpaprPhbState *sphb; |
| 150 | SpaprTceTable *tcet = NULL; |
| 151 | uint32_t addr, page_shift, window_shift, liobn; |
| 152 | uint64_t buid, win_addr; |
| 153 | int windows; |
| 154 | |
| 155 | if ((nargs != 5) || (nret != 4)) { |
| 156 | goto param_error_exit; |
| 157 | } |
| 158 | |
| 159 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
| 160 | addr = rtas_ld(args, 0); |
| 161 | sphb = spapr_pci_find_phb(spapr, buid); |
| 162 | if (!sphb || !sphb->ddw_enabled) { |
| 163 | goto param_error_exit; |
| 164 | } |
| 165 | |
| 166 | page_shift = rtas_ld(args, 3); |
| 167 | window_shift = rtas_ld(args, 4); |
| 168 | liobn = spapr_phb_get_free_liobn(sphb); |
| 169 | windows = spapr_phb_get_active_win_num(sphb); |
| 170 | |
| 171 | if (!(sphb->page_size_mask & (1ULL << page_shift)) || |
| 172 | (window_shift < page_shift)) { |
| 173 | goto param_error_exit; |
| 174 | } |
| 175 | |
| 176 | if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { |
| 177 | goto hw_error_exit; |
| 178 | } |
| 179 | |
| 180 | tcet = spapr_tce_find_by_liobn(liobn); |
| 181 | if (!tcet) { |
| 182 | goto hw_error_exit; |
| 183 | } |
| 184 | |
| 185 | win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; |
| 186 | /* |
| 187 | * We have just created a window, we know for the fact that it is empty, |
| 188 | * use a hack to avoid iterating over the table as it is quite possible |
| 189 | * to have billions of TCEs, all empty. |
| 190 | * Note that we cannot delay this to the first H_PUT_TCE as this hcall is |
| 191 | * mostly likely to be handled in KVM so QEMU just does not know if it |
| 192 | * happened. |
| 193 | */ |
| 194 | tcet->skipping_replay = true; |
| 195 | spapr_tce_table_enable(tcet, page_shift, win_addr, |
| 196 | 1ULL << (window_shift - page_shift)); |
| 197 | tcet->skipping_replay = false; |
| 198 | if (!tcet->nb_table) { |
| 199 | goto hw_error_exit; |
| 200 | } |
| 201 | |
| 202 | trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, |
| 203 | 1ULL << window_shift, tcet->bus_offset, liobn); |
| 204 | |
| 205 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| 206 | rtas_st(rets, 1, liobn); |
| 207 | rtas_st(rets, 2, tcet->bus_offset >> 32); |
| 208 | rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); |
| 209 | |
| 210 | return; |
| 211 | |
| 212 | hw_error_exit: |
| 213 | rtas_st(rets, 0, RTAS_OUT_HW_ERROR); |
| 214 | return; |
| 215 | |
| 216 | param_error_exit: |
| 217 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| 218 | } |
| 219 | |
| 220 | static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, |
| 221 | SpaprMachineState *spapr, |
| 222 | uint32_t token, uint32_t nargs, |
| 223 | target_ulong args, |
| 224 | uint32_t nret, target_ulong rets) |
| 225 | { |
| 226 | SpaprPhbState *sphb; |
| 227 | SpaprTceTable *tcet; |
| 228 | uint32_t liobn; |
| 229 | bool def_win_removed; |
| 230 | |
| 231 | if ((nargs != 1) || (nret != 1)) { |
| 232 | goto param_error_exit; |
| 233 | } |
| 234 | |
| 235 | liobn = rtas_ld(args, 0); |
| 236 | tcet = spapr_tce_find_by_liobn(liobn); |
| 237 | if (!tcet) { |
| 238 | goto param_error_exit; |
| 239 | } |
| 240 | |
| 241 | sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); |
| 242 | if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { |
| 243 | goto param_error_exit; |
| 244 | } |
| 245 | |
| 246 | def_win_removed = tcet->def_win; |
| 247 | spapr_tce_table_disable(tcet); |
| 248 | trace_spapr_iommu_ddw_remove(liobn); |
| 249 | |
| 250 | /* |
| 251 | * PAPR+/LoPAPR says: |
| 252 | * The platform must restore the default DMA window for the PE on a call |
| 253 | * to the ibm,remove-pe-dma-window RTAS call when all of the following |
| 254 | * are true: |
| 255 | * a. The call removes the last DMA window remaining for the PE. |
| 256 | * b. The DMA window being removed is not the default window |
| 257 | */ |
| 258 | if (spapr_phb_get_active_win_num(sphb) == 0 && !def_win_removed) { |
| 259 | spapr_phb_dma_reset(sphb); |
| 260 | trace_spapr_iommu_ddw_reset(sphb->buid, 0); |
| 261 | } |
| 262 | |
| 263 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| 264 | return; |
| 265 | |
| 266 | param_error_exit: |
| 267 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| 268 | } |
| 269 | |
| 270 | static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, |
| 271 | SpaprMachineState *spapr, |
| 272 | uint32_t token, uint32_t nargs, |
| 273 | target_ulong args, |
| 274 | uint32_t nret, target_ulong rets) |
| 275 | { |
| 276 | SpaprPhbState *sphb; |
| 277 | uint64_t buid; |
| 278 | uint32_t addr; |
| 279 | |
| 280 | if ((nargs != 3) || (nret != 1)) { |
| 281 | goto param_error_exit; |
| 282 | } |
| 283 | |
| 284 | buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); |
| 285 | addr = rtas_ld(args, 0); |
| 286 | sphb = spapr_pci_find_phb(spapr, buid); |
| 287 | if (!sphb || !sphb->ddw_enabled) { |
| 288 | goto param_error_exit; |
| 289 | } |
| 290 | |
| 291 | spapr_phb_dma_reset(sphb); |
| 292 | trace_spapr_iommu_ddw_reset(buid, addr); |
| 293 | |
| 294 | rtas_st(rets, 0, RTAS_OUT_SUCCESS); |
| 295 | |
| 296 | return; |
| 297 | |
| 298 | param_error_exit: |
| 299 | rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); |
| 300 | } |
| 301 | |
| 302 | static void spapr_rtas_ddw_init(void) |
| 303 | { |
| 304 | spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, |
| 305 | "ibm,query-pe-dma-window", |
| 306 | rtas_ibm_query_pe_dma_window); |
| 307 | spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, |
| 308 | "ibm,create-pe-dma-window", |
| 309 | rtas_ibm_create_pe_dma_window); |
| 310 | spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, |
| 311 | "ibm,remove-pe-dma-window", |
| 312 | rtas_ibm_remove_pe_dma_window); |
| 313 | spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, |
| 314 | "ibm,reset-pe-dma-window", |
| 315 | rtas_ibm_reset_pe_dma_window); |
| 316 | } |
| 317 | |
| 318 | type_init(spapr_rtas_ddw_init) |