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 "cpu.h" 22 #include "qemu/error-report.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 { 24, RTAS_DDW_PGSIZE_16M }, 76 { 25, RTAS_DDW_PGSIZE_32M }, 77 { 26, RTAS_DDW_PGSIZE_64M }, 78 { 27, RTAS_DDW_PGSIZE_128M }, 79 { 28, RTAS_DDW_PGSIZE_256M }, 80 { 34, RTAS_DDW_PGSIZE_16G }, 81 }; 82 83 for (i = 0; i < ARRAY_SIZE(masks); ++i) { 84 if (page_mask & (1ULL << masks[i].shift)) { 85 mask |= masks[i].mask; 86 } 87 } 88 89 return mask; 90 } 91 92 static void rtas_ibm_query_pe_dma_window(PowerPCCPU *cpu, 93 sPAPRMachineState *spapr, 94 uint32_t token, uint32_t nargs, 95 target_ulong args, 96 uint32_t nret, target_ulong rets) 97 { 98 sPAPRPHBState *sphb; 99 uint64_t buid, max_window_size; 100 uint32_t avail, addr, pgmask = 0; 101 MachineState *machine = MACHINE(spapr); 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 /* 118 * This is "Largest contiguous block of TCEs allocated specifically 119 * for (that is, are reserved for) this PE". 120 * Return the maximum number as maximum supported RAM size was in 4K pages. 121 */ 122 if (machine->ram_size == machine->maxram_size) { 123 max_window_size = machine->ram_size; 124 } else { 125 max_window_size = machine->device_memory->base + 126 memory_region_size(&machine->device_memory->mr); 127 } 128 129 avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb); 130 131 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 132 rtas_st(rets, 1, avail); 133 rtas_st(rets, 2, max_window_size >> SPAPR_TCE_PAGE_SHIFT); 134 rtas_st(rets, 3, pgmask); 135 rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ 136 137 trace_spapr_iommu_ddw_query(buid, addr, avail, max_window_size, pgmask); 138 return; 139 140 param_error_exit: 141 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 142 } 143 144 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, 145 sPAPRMachineState *spapr, 146 uint32_t token, uint32_t nargs, 147 target_ulong args, 148 uint32_t nret, target_ulong rets) 149 { 150 sPAPRPHBState *sphb; 151 sPAPRTCETable *tcet = NULL; 152 uint32_t addr, page_shift, window_shift, liobn; 153 uint64_t buid, win_addr; 154 int windows; 155 156 if ((nargs != 5) || (nret != 4)) { 157 goto param_error_exit; 158 } 159 160 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 161 addr = rtas_ld(args, 0); 162 sphb = spapr_pci_find_phb(spapr, buid); 163 if (!sphb || !sphb->ddw_enabled) { 164 goto param_error_exit; 165 } 166 167 page_shift = rtas_ld(args, 3); 168 window_shift = rtas_ld(args, 4); 169 liobn = spapr_phb_get_free_liobn(sphb); 170 windows = spapr_phb_get_active_win_num(sphb); 171 172 if (!(sphb->page_size_mask & (1ULL << page_shift)) || 173 (window_shift < page_shift)) { 174 goto param_error_exit; 175 } 176 177 if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { 178 goto hw_error_exit; 179 } 180 181 tcet = spapr_tce_find_by_liobn(liobn); 182 if (!tcet) { 183 goto hw_error_exit; 184 } 185 186 win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; 187 spapr_tce_table_enable(tcet, page_shift, win_addr, 188 1ULL << (window_shift - page_shift)); 189 if (!tcet->nb_table) { 190 goto hw_error_exit; 191 } 192 193 trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, 194 1ULL << window_shift, tcet->bus_offset, liobn); 195 196 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 197 rtas_st(rets, 1, liobn); 198 rtas_st(rets, 2, tcet->bus_offset >> 32); 199 rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); 200 201 return; 202 203 hw_error_exit: 204 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 205 return; 206 207 param_error_exit: 208 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 209 } 210 211 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, 212 sPAPRMachineState *spapr, 213 uint32_t token, uint32_t nargs, 214 target_ulong args, 215 uint32_t nret, target_ulong rets) 216 { 217 sPAPRPHBState *sphb; 218 sPAPRTCETable *tcet; 219 uint32_t liobn; 220 221 if ((nargs != 1) || (nret != 1)) { 222 goto param_error_exit; 223 } 224 225 liobn = rtas_ld(args, 0); 226 tcet = spapr_tce_find_by_liobn(liobn); 227 if (!tcet) { 228 goto param_error_exit; 229 } 230 231 sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); 232 if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { 233 goto param_error_exit; 234 } 235 236 spapr_tce_table_disable(tcet); 237 trace_spapr_iommu_ddw_remove(liobn); 238 239 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 240 return; 241 242 param_error_exit: 243 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 244 } 245 246 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, 247 sPAPRMachineState *spapr, 248 uint32_t token, uint32_t nargs, 249 target_ulong args, 250 uint32_t nret, target_ulong rets) 251 { 252 sPAPRPHBState *sphb; 253 uint64_t buid; 254 uint32_t addr; 255 256 if ((nargs != 3) || (nret != 1)) { 257 goto param_error_exit; 258 } 259 260 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 261 addr = rtas_ld(args, 0); 262 sphb = spapr_pci_find_phb(spapr, buid); 263 if (!sphb || !sphb->ddw_enabled) { 264 goto param_error_exit; 265 } 266 267 spapr_phb_dma_reset(sphb); 268 trace_spapr_iommu_ddw_reset(buid, addr); 269 270 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 271 272 return; 273 274 param_error_exit: 275 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 276 } 277 278 static void spapr_rtas_ddw_init(void) 279 { 280 spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, 281 "ibm,query-pe-dma-window", 282 rtas_ibm_query_pe_dma_window); 283 spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, 284 "ibm,create-pe-dma-window", 285 rtas_ibm_create_pe_dma_window); 286 spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, 287 "ibm,remove-pe-dma-window", 288 rtas_ibm_remove_pe_dma_window); 289 spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, 290 "ibm,reset-pe-dma-window", 291 rtas_ibm_reset_pe_dma_window); 292 } 293 294 type_init(spapr_rtas_ddw_init) 295