1 /* 2 * Copyright (C) 2020, Red Hat Inc, Eric Auger <eric.auger@redhat.com> 3 * 4 * Most of the code is copy-pasted from: 5 * drivers/irqchip/irq-gic-v3-its.c 6 * This work is licensed under the terms of the GNU LGPL, version 2. 7 */ 8 #include <asm/io.h> 9 #include <asm/gic.h> 10 11 #define ITS_ITT_ALIGN SZ_256 12 13 static const char * const its_cmd_string[] = { 14 [GITS_CMD_MAPD] = "MAPD", 15 [GITS_CMD_MAPC] = "MAPC", 16 [GITS_CMD_MAPTI] = "MAPTI", 17 [GITS_CMD_MAPI] = "MAPI", 18 [GITS_CMD_MOVI] = "MOVI", 19 [GITS_CMD_DISCARD] = "DISCARD", 20 [GITS_CMD_INV] = "INV", 21 [GITS_CMD_MOVALL] = "MOVALL", 22 [GITS_CMD_INVALL] = "INVALL", 23 [GITS_CMD_INT] = "INT", 24 [GITS_CMD_CLEAR] = "CLEAR", 25 [GITS_CMD_SYNC] = "SYNC", 26 }; 27 28 struct its_cmd_desc { 29 union { 30 struct { 31 struct its_device *dev; 32 u32 event_id; 33 } its_inv_cmd; 34 35 struct { 36 struct its_device *dev; 37 u32 event_id; 38 } its_int_cmd; 39 40 struct { 41 struct its_device *dev; 42 bool valid; 43 } its_mapd_cmd; 44 45 struct { 46 struct its_collection *col; 47 bool valid; 48 } its_mapc_cmd; 49 50 struct { 51 struct its_device *dev; 52 u32 phys_id; 53 u32 event_id; 54 u32 col_id; 55 } its_mapti_cmd; 56 57 struct { 58 struct its_device *dev; 59 struct its_collection *col; 60 u32 event_id; 61 } its_movi_cmd; 62 63 struct { 64 struct its_device *dev; 65 u32 event_id; 66 } its_discard_cmd; 67 68 struct { 69 struct its_device *dev; 70 u32 event_id; 71 } its_clear_cmd; 72 73 struct { 74 struct its_collection *col; 75 } its_invall_cmd; 76 77 struct { 78 struct its_collection *col; 79 } its_sync_cmd; 80 }; 81 bool verbose; 82 }; 83 84 typedef void (*its_cmd_builder_t)(struct its_cmd_block *, 85 struct its_cmd_desc *); 86 87 /* ITS COMMANDS */ 88 89 static void its_mask_encode(u64 *raw_cmd, u64 val, int h, int l) 90 { 91 u64 mask = GENMASK_ULL(h, l); 92 *raw_cmd &= ~mask; 93 *raw_cmd |= (val << l) & mask; 94 } 95 96 static void its_encode_cmd(struct its_cmd_block *cmd, u8 cmd_nr) 97 { 98 its_mask_encode(&cmd->raw_cmd[0], cmd_nr, 7, 0); 99 } 100 101 static void its_encode_devid(struct its_cmd_block *cmd, u32 devid) 102 { 103 its_mask_encode(&cmd->raw_cmd[0], devid, 63, 32); 104 } 105 106 static void its_encode_event_id(struct its_cmd_block *cmd, u32 id) 107 { 108 its_mask_encode(&cmd->raw_cmd[1], id, 31, 0); 109 } 110 111 static void its_encode_phys_id(struct its_cmd_block *cmd, u32 phys_id) 112 { 113 its_mask_encode(&cmd->raw_cmd[1], phys_id, 63, 32); 114 } 115 116 static void its_encode_size(struct its_cmd_block *cmd, u8 size) 117 { 118 its_mask_encode(&cmd->raw_cmd[1], size, 4, 0); 119 } 120 121 static void its_encode_itt(struct its_cmd_block *cmd, u64 itt_addr) 122 { 123 its_mask_encode(&cmd->raw_cmd[2], itt_addr >> 8, 50, 8); 124 } 125 126 static void its_encode_valid(struct its_cmd_block *cmd, int valid) 127 { 128 its_mask_encode(&cmd->raw_cmd[2], !!valid, 63, 63); 129 } 130 131 static void its_encode_target(struct its_cmd_block *cmd, u64 target_addr) 132 { 133 its_mask_encode(&cmd->raw_cmd[2], target_addr >> 16, 50, 16); 134 } 135 136 static void its_encode_collection(struct its_cmd_block *cmd, u16 col) 137 { 138 its_mask_encode(&cmd->raw_cmd[2], col, 15, 0); 139 } 140 141 static inline void its_fixup_cmd(struct its_cmd_block *cmd) 142 { 143 /* Let's fixup BE commands */ 144 cmd->raw_cmd[0] = cpu_to_le64(cmd->raw_cmd[0]); 145 cmd->raw_cmd[1] = cpu_to_le64(cmd->raw_cmd[1]); 146 cmd->raw_cmd[2] = cpu_to_le64(cmd->raw_cmd[2]); 147 cmd->raw_cmd[3] = cpu_to_le64(cmd->raw_cmd[3]); 148 } 149 150 static u64 its_cmd_ptr_to_offset(struct its_cmd_block *ptr) 151 { 152 return (ptr - its_data.cmd_base) * sizeof(*ptr); 153 } 154 155 static struct its_cmd_block *its_post_commands(void) 156 { 157 u64 wr = its_cmd_ptr_to_offset(its_data.cmd_write); 158 159 writeq(wr, its_data.base + GITS_CWRITER); 160 return its_data.cmd_write; 161 } 162 163 static struct its_cmd_block *its_allocate_entry(void) 164 { 165 struct its_cmd_block *cmd; 166 167 assert((u64)its_data.cmd_write < (u64)its_data.cmd_base + SZ_64K); 168 cmd = its_data.cmd_write++; 169 return cmd; 170 } 171 172 static void its_wait_for_range_completion(struct its_cmd_block *from, 173 struct its_cmd_block *to) 174 { 175 u64 rd_idx, from_idx, to_idx; 176 u32 count = 1000000; /* 1s! */ 177 178 from_idx = its_cmd_ptr_to_offset(from); 179 to_idx = its_cmd_ptr_to_offset(to); 180 while (1) { 181 rd_idx = readq(its_data.base + GITS_CREADR); 182 if (rd_idx >= to_idx || rd_idx < from_idx) 183 break; 184 185 count--; 186 if (!count) { 187 unsigned int cmd_id = from->raw_cmd[0] & 0xFF; 188 189 assert_msg(false, "%s timeout!", 190 cmd_id <= 0xF ? its_cmd_string[cmd_id] : 191 "Unexpected"); 192 } 193 udelay(1); 194 } 195 } 196 197 static void its_send_single_command(its_cmd_builder_t builder, 198 struct its_cmd_desc *desc) 199 { 200 struct its_cmd_block *cmd, *next_cmd; 201 202 cmd = its_allocate_entry(); 203 builder(cmd, desc); 204 next_cmd = its_post_commands(); 205 206 its_wait_for_range_completion(cmd, next_cmd); 207 } 208 209 static void its_build_mapd_cmd(struct its_cmd_block *cmd, 210 struct its_cmd_desc *desc) 211 { 212 unsigned long itt_addr; 213 u8 size = desc->its_mapd_cmd.dev->nr_ites; 214 215 itt_addr = (unsigned long)(virt_to_phys(desc->its_mapd_cmd.dev->itt)); 216 itt_addr = ALIGN(itt_addr, ITS_ITT_ALIGN); 217 218 its_encode_cmd(cmd, GITS_CMD_MAPD); 219 its_encode_devid(cmd, desc->its_mapd_cmd.dev->device_id); 220 its_encode_size(cmd, size - 1); 221 its_encode_itt(cmd, itt_addr); 222 its_encode_valid(cmd, desc->its_mapd_cmd.valid); 223 its_fixup_cmd(cmd); 224 if (desc->verbose) 225 printf("ITS: MAPD devid=%d size = 0x%x itt=0x%lx valid=%d\n", 226 desc->its_mapd_cmd.dev->device_id, 227 size, itt_addr, desc->its_mapd_cmd.valid); 228 } 229 230 static void its_build_mapc_cmd(struct its_cmd_block *cmd, 231 struct its_cmd_desc *desc) 232 { 233 its_encode_cmd(cmd, GITS_CMD_MAPC); 234 its_encode_collection(cmd, desc->its_mapc_cmd.col->col_id); 235 its_encode_target(cmd, desc->its_mapc_cmd.col->target_address); 236 its_encode_valid(cmd, desc->its_mapc_cmd.valid); 237 its_fixup_cmd(cmd); 238 if (desc->verbose) 239 printf("MAPC col_id=%d target_addr = 0x%lx valid=%d\n", 240 desc->its_mapc_cmd.col->col_id, 241 desc->its_mapc_cmd.col->target_address, 242 desc->its_mapc_cmd.valid); 243 } 244 245 static void its_build_mapti_cmd(struct its_cmd_block *cmd, 246 struct its_cmd_desc *desc) 247 { 248 its_encode_cmd(cmd, GITS_CMD_MAPTI); 249 its_encode_devid(cmd, desc->its_mapti_cmd.dev->device_id); 250 its_encode_event_id(cmd, desc->its_mapti_cmd.event_id); 251 its_encode_phys_id(cmd, desc->its_mapti_cmd.phys_id); 252 its_encode_collection(cmd, desc->its_mapti_cmd.col_id); 253 its_fixup_cmd(cmd); 254 if (desc->verbose) 255 printf("MAPTI dev_id=%d event_id=%d -> phys_id=%d, col_id=%d\n", 256 desc->its_mapti_cmd.dev->device_id, 257 desc->its_mapti_cmd.event_id, 258 desc->its_mapti_cmd.phys_id, 259 desc->its_mapti_cmd.col_id); 260 } 261 262 static void its_build_invall_cmd(struct its_cmd_block *cmd, 263 struct its_cmd_desc *desc) 264 { 265 its_encode_cmd(cmd, GITS_CMD_INVALL); 266 its_encode_collection(cmd, desc->its_invall_cmd.col->col_id); 267 its_fixup_cmd(cmd); 268 if (desc->verbose) 269 printf("INVALL col_id=%d\n", desc->its_invall_cmd.col->col_id); 270 } 271 272 static void its_build_clear_cmd(struct its_cmd_block *cmd, 273 struct its_cmd_desc *desc) 274 { 275 its_encode_cmd(cmd, GITS_CMD_CLEAR); 276 its_encode_devid(cmd, desc->its_clear_cmd.dev->device_id); 277 its_encode_event_id(cmd, desc->its_clear_cmd.event_id); 278 its_fixup_cmd(cmd); 279 if (desc->verbose) 280 printf("CLEAR dev_id=%d event_id=%d\n", desc->its_clear_cmd.dev->device_id, desc->its_clear_cmd.event_id); 281 } 282 283 static void its_build_discard_cmd(struct its_cmd_block *cmd, 284 struct its_cmd_desc *desc) 285 { 286 its_encode_cmd(cmd, GITS_CMD_DISCARD); 287 its_encode_devid(cmd, desc->its_discard_cmd.dev->device_id); 288 its_encode_event_id(cmd, desc->its_discard_cmd.event_id); 289 its_fixup_cmd(cmd); 290 if (desc->verbose) 291 printf("DISCARD dev_id=%d event_id=%d\n", 292 desc->its_clear_cmd.dev->device_id, desc->its_clear_cmd.event_id); 293 } 294 295 static void its_build_inv_cmd(struct its_cmd_block *cmd, 296 struct its_cmd_desc *desc) 297 { 298 its_encode_cmd(cmd, GITS_CMD_INV); 299 its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id); 300 its_encode_event_id(cmd, desc->its_inv_cmd.event_id); 301 its_fixup_cmd(cmd); 302 if (desc->verbose) 303 printf("INV dev_id=%d event_id=%d\n", 304 desc->its_inv_cmd.dev->device_id, 305 desc->its_inv_cmd.event_id); 306 } 307 308 static void its_build_int_cmd(struct its_cmd_block *cmd, 309 struct its_cmd_desc *desc) 310 { 311 its_encode_cmd(cmd, GITS_CMD_INT); 312 its_encode_devid(cmd, desc->its_int_cmd.dev->device_id); 313 its_encode_event_id(cmd, desc->its_int_cmd.event_id); 314 its_fixup_cmd(cmd); 315 if (desc->verbose) 316 printf("INT dev_id=%d event_id=%d\n", 317 desc->its_int_cmd.dev->device_id, 318 desc->its_int_cmd.event_id); 319 } 320 321 static void its_build_sync_cmd(struct its_cmd_block *cmd, 322 struct its_cmd_desc *desc) 323 { 324 its_encode_cmd(cmd, GITS_CMD_SYNC); 325 its_encode_target(cmd, desc->its_sync_cmd.col->target_address); 326 its_fixup_cmd(cmd); 327 if (desc->verbose) 328 printf("SYNC target_addr = 0x%lx\n", 329 desc->its_sync_cmd.col->target_address); 330 } 331 332 static void its_build_movi_cmd(struct its_cmd_block *cmd, 333 struct its_cmd_desc *desc) 334 { 335 its_encode_cmd(cmd, GITS_CMD_MOVI); 336 its_encode_devid(cmd, desc->its_movi_cmd.dev->device_id); 337 its_encode_event_id(cmd, desc->its_movi_cmd.event_id); 338 its_encode_collection(cmd, desc->its_movi_cmd.col->col_id); 339 its_fixup_cmd(cmd); 340 if (desc->verbose) 341 printf("MOVI dev_id=%d event_id = %d col_id=%d\n", 342 desc->its_movi_cmd.dev->device_id, 343 desc->its_movi_cmd.event_id, 344 desc->its_movi_cmd.col->col_id); 345 } 346 347 void __its_send_mapd(struct its_device *dev, int valid, bool verbose) 348 { 349 struct its_cmd_desc desc; 350 351 desc.its_mapd_cmd.dev = dev; 352 desc.its_mapd_cmd.valid = !!valid; 353 desc.verbose = verbose; 354 355 its_send_single_command(its_build_mapd_cmd, &desc); 356 } 357 358 void __its_send_mapc(struct its_collection *col, int valid, bool verbose) 359 { 360 struct its_cmd_desc desc; 361 362 desc.its_mapc_cmd.col = col; 363 desc.its_mapc_cmd.valid = !!valid; 364 desc.verbose = verbose; 365 366 its_send_single_command(its_build_mapc_cmd, &desc); 367 } 368 369 void __its_send_mapti(struct its_device *dev, u32 irq_id, 370 u32 event_id, struct its_collection *col, bool verbose) 371 { 372 struct its_cmd_desc desc; 373 374 desc.its_mapti_cmd.dev = dev; 375 desc.its_mapti_cmd.phys_id = irq_id; 376 desc.its_mapti_cmd.event_id = event_id; 377 desc.its_mapti_cmd.col_id = col->col_id; 378 desc.verbose = verbose; 379 380 its_send_single_command(its_build_mapti_cmd, &desc); 381 } 382 383 void __its_send_int(struct its_device *dev, u32 event_id, bool verbose) 384 { 385 struct its_cmd_desc desc; 386 387 desc.its_int_cmd.dev = dev; 388 desc.its_int_cmd.event_id = event_id; 389 desc.verbose = verbose; 390 391 its_send_single_command(its_build_int_cmd, &desc); 392 } 393 394 void __its_send_movi(struct its_device *dev, struct its_collection *col, 395 u32 id, bool verbose) 396 { 397 struct its_cmd_desc desc; 398 399 desc.its_movi_cmd.dev = dev; 400 desc.its_movi_cmd.col = col; 401 desc.its_movi_cmd.event_id = id; 402 desc.verbose = verbose; 403 404 its_send_single_command(its_build_movi_cmd, &desc); 405 } 406 407 void __its_send_invall(struct its_collection *col, bool verbose) 408 { 409 struct its_cmd_desc desc; 410 411 desc.its_invall_cmd.col = col; 412 desc.verbose = verbose; 413 414 its_send_single_command(its_build_invall_cmd, &desc); 415 } 416 417 void __its_send_inv(struct its_device *dev, u32 event_id, bool verbose) 418 { 419 struct its_cmd_desc desc; 420 421 desc.its_inv_cmd.dev = dev; 422 desc.its_inv_cmd.event_id = event_id; 423 desc.verbose = verbose; 424 425 its_send_single_command(its_build_inv_cmd, &desc); 426 } 427 428 void __its_send_discard(struct its_device *dev, u32 event_id, bool verbose) 429 { 430 struct its_cmd_desc desc; 431 432 desc.its_discard_cmd.dev = dev; 433 desc.its_discard_cmd.event_id = event_id; 434 desc.verbose = verbose; 435 436 its_send_single_command(its_build_discard_cmd, &desc); 437 } 438 439 void __its_send_clear(struct its_device *dev, u32 event_id, bool verbose) 440 { 441 struct its_cmd_desc desc; 442 443 desc.its_clear_cmd.dev = dev; 444 desc.its_clear_cmd.event_id = event_id; 445 desc.verbose = verbose; 446 447 its_send_single_command(its_build_clear_cmd, &desc); 448 } 449 450 void __its_send_sync(struct its_collection *col, bool verbose) 451 { 452 struct its_cmd_desc desc; 453 454 desc.its_sync_cmd.col = col; 455 desc.verbose = verbose; 456 457 its_send_single_command(its_build_sync_cmd, &desc); 458 } 459 460