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 MemoryHotplugState *hpms = &spapr->hotplug_memory; 126 127 max_window_size = hpms->base + memory_region_size(&hpms->mr); 128 } 129 130 avail = SPAPR_PCI_DMA_MAX_WINDOWS - spapr_phb_get_active_win_num(sphb); 131 132 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 133 rtas_st(rets, 1, avail); 134 rtas_st(rets, 2, max_window_size >> SPAPR_TCE_PAGE_SHIFT); 135 rtas_st(rets, 3, pgmask); 136 rtas_st(rets, 4, 0); /* DMA migration mask, not supported */ 137 138 trace_spapr_iommu_ddw_query(buid, addr, avail, max_window_size, pgmask); 139 return; 140 141 param_error_exit: 142 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 143 } 144 145 static void rtas_ibm_create_pe_dma_window(PowerPCCPU *cpu, 146 sPAPRMachineState *spapr, 147 uint32_t token, uint32_t nargs, 148 target_ulong args, 149 uint32_t nret, target_ulong rets) 150 { 151 sPAPRPHBState *sphb; 152 sPAPRTCETable *tcet = NULL; 153 uint32_t addr, page_shift, window_shift, liobn; 154 uint64_t buid, win_addr; 155 int windows; 156 157 if ((nargs != 5) || (nret != 4)) { 158 goto param_error_exit; 159 } 160 161 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 162 addr = rtas_ld(args, 0); 163 sphb = spapr_pci_find_phb(spapr, buid); 164 if (!sphb || !sphb->ddw_enabled) { 165 goto param_error_exit; 166 } 167 168 page_shift = rtas_ld(args, 3); 169 window_shift = rtas_ld(args, 4); 170 liobn = spapr_phb_get_free_liobn(sphb); 171 windows = spapr_phb_get_active_win_num(sphb); 172 173 if (!(sphb->page_size_mask & (1ULL << page_shift)) || 174 (window_shift < page_shift)) { 175 goto param_error_exit; 176 } 177 178 if (!liobn || !sphb->ddw_enabled || windows == SPAPR_PCI_DMA_MAX_WINDOWS) { 179 goto hw_error_exit; 180 } 181 182 tcet = spapr_tce_find_by_liobn(liobn); 183 if (!tcet) { 184 goto hw_error_exit; 185 } 186 187 win_addr = (windows == 0) ? sphb->dma_win_addr : sphb->dma64_win_addr; 188 spapr_tce_table_enable(tcet, page_shift, win_addr, 189 1ULL << (window_shift - page_shift)); 190 if (!tcet->nb_table) { 191 goto hw_error_exit; 192 } 193 194 trace_spapr_iommu_ddw_create(buid, addr, 1ULL << page_shift, 195 1ULL << window_shift, tcet->bus_offset, liobn); 196 197 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 198 rtas_st(rets, 1, liobn); 199 rtas_st(rets, 2, tcet->bus_offset >> 32); 200 rtas_st(rets, 3, tcet->bus_offset & ((uint32_t) -1)); 201 202 return; 203 204 hw_error_exit: 205 rtas_st(rets, 0, RTAS_OUT_HW_ERROR); 206 return; 207 208 param_error_exit: 209 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 210 } 211 212 static void rtas_ibm_remove_pe_dma_window(PowerPCCPU *cpu, 213 sPAPRMachineState *spapr, 214 uint32_t token, uint32_t nargs, 215 target_ulong args, 216 uint32_t nret, target_ulong rets) 217 { 218 sPAPRPHBState *sphb; 219 sPAPRTCETable *tcet; 220 uint32_t liobn; 221 222 if ((nargs != 1) || (nret != 1)) { 223 goto param_error_exit; 224 } 225 226 liobn = rtas_ld(args, 0); 227 tcet = spapr_tce_find_by_liobn(liobn); 228 if (!tcet) { 229 goto param_error_exit; 230 } 231 232 sphb = SPAPR_PCI_HOST_BRIDGE(OBJECT(tcet)->parent); 233 if (!sphb || !sphb->ddw_enabled || !tcet->nb_table) { 234 goto param_error_exit; 235 } 236 237 spapr_tce_table_disable(tcet); 238 trace_spapr_iommu_ddw_remove(liobn); 239 240 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 241 return; 242 243 param_error_exit: 244 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 245 } 246 247 static void rtas_ibm_reset_pe_dma_window(PowerPCCPU *cpu, 248 sPAPRMachineState *spapr, 249 uint32_t token, uint32_t nargs, 250 target_ulong args, 251 uint32_t nret, target_ulong rets) 252 { 253 sPAPRPHBState *sphb; 254 uint64_t buid; 255 uint32_t addr; 256 257 if ((nargs != 3) || (nret != 1)) { 258 goto param_error_exit; 259 } 260 261 buid = ((uint64_t)rtas_ld(args, 1) << 32) | rtas_ld(args, 2); 262 addr = rtas_ld(args, 0); 263 sphb = spapr_pci_find_phb(spapr, buid); 264 if (!sphb || !sphb->ddw_enabled) { 265 goto param_error_exit; 266 } 267 268 spapr_phb_dma_reset(sphb); 269 trace_spapr_iommu_ddw_reset(buid, addr); 270 271 rtas_st(rets, 0, RTAS_OUT_SUCCESS); 272 273 return; 274 275 param_error_exit: 276 rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); 277 } 278 279 static void spapr_rtas_ddw_init(void) 280 { 281 spapr_rtas_register(RTAS_IBM_QUERY_PE_DMA_WINDOW, 282 "ibm,query-pe-dma-window", 283 rtas_ibm_query_pe_dma_window); 284 spapr_rtas_register(RTAS_IBM_CREATE_PE_DMA_WINDOW, 285 "ibm,create-pe-dma-window", 286 rtas_ibm_create_pe_dma_window); 287 spapr_rtas_register(RTAS_IBM_REMOVE_PE_DMA_WINDOW, 288 "ibm,remove-pe-dma-window", 289 rtas_ibm_remove_pe_dma_window); 290 spapr_rtas_register(RTAS_IBM_RESET_PE_DMA_WINDOW, 291 "ibm,reset-pe-dma-window", 292 rtas_ibm_reset_pe_dma_window); 293 } 294 295 type_init(spapr_rtas_ddw_init) 296