1/*- 2 * Copyright (c) 2016-2017 Alexander Motin <mav@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: stable/11/sys/dev/ntb/ntb.c 355152 2019-11-28 00:41:42Z mav $"); 29 30#include <sys/param.h> 31#include <sys/kernel.h> 32#include <sys/systm.h> 33#include <sys/bus.h> 34#include <sys/rmlock.h> 35#include <sys/malloc.h> 36#include <sys/module.h> 37#include <sys/sysctl.h> 38 39#include "ntb.h" 40 41devclass_t ntb_hw_devclass; 42SYSCTL_NODE(_hw, OID_AUTO, ntb, CTLFLAG_RW, 0, "NTB sysctls"); 43 44struct ntb_child { 45 device_t dev; 46 int function; 47 int enabled; 48 int mwoff; 49 int mwcnt; 50 int spadoff; 51 int spadcnt; 52 int dboff; 53 int dbcnt; 54 uint64_t dbmask; 55 void *ctx; 56 const struct ntb_ctx_ops *ctx_ops; 57 struct rmlock ctx_lock; 58 struct ntb_child *next; 59}; 60 61int 62ntb_register_device(device_t dev) 63{ 64 struct ntb_child **cpp = device_get_softc(dev); 65 struct ntb_child *nc; 66 int i, mw, mwu, mwt, spad, spadu, spadt, db, dbu, dbt; 67 char cfg[128] = ""; 68 char buf[32]; 69 char *n, *np, *c, *p, *name; 70 71 mwu = 0; 72 mwt = NTB_MW_COUNT(dev); 73 spadu = 0; 74 spadt = NTB_SPAD_COUNT(dev); 75 dbu = 0; 76 dbt = flsll(NTB_DB_VALID_MASK(dev)); 77 78 device_printf(dev, "%d memory windows, %d scratchpads, " 79 "%d doorbells\n", mwt, spadt, dbt); 80 81 snprintf(buf, sizeof(buf), "hint.%s.%d.config", device_get_name(dev), 82 device_get_unit(dev)); 83 TUNABLE_STR_FETCH(buf, cfg, sizeof(cfg)); 84 n = cfg; 85 i = 0; 86 while ((c = strsep(&n, ",")) != NULL) { 87 np = c; 88 name = strsep(&np, ":"); 89 if (name != NULL && name[0] == 0) 90 name = NULL; 91 p = strsep(&np, ":"); 92 mw = (p && p[0] != 0) ? strtol(p, NULL, 10) : mwt - mwu; 93 p = strsep(&np, ":"); 94 spad = (p && p[0] != 0) ? strtol(p, NULL, 10) : spadt - spadu; 95 db = (np && np[0] != 0) ? strtol(np, NULL, 10) : dbt - dbu; 96 97 if (mw > mwt - mwu || spad > spadt - spadu || db > dbt - dbu) { 98 device_printf(dev, "Not enough resources for config\n"); 99 break; 100 } 101 102 nc = malloc(sizeof(*nc), M_DEVBUF, M_WAITOK | M_ZERO); 103 nc->function = i; 104 nc->mwoff = mwu; 105 nc->mwcnt = mw; 106 nc->spadoff = spadu; 107 nc->spadcnt = spad; 108 nc->dboff = dbu; 109 nc->dbcnt = db; 110 nc->dbmask = (db == 0) ? 0 : (0xffffffffffffffff >> (64 - db)); 111 rm_init(&nc->ctx_lock, "ntb ctx"); 112 nc->dev = device_add_child(dev, name, -1); 113 if (nc->dev == NULL) { 114 ntb_unregister_device(dev); 115 return (ENOMEM); 116 } 117 device_set_ivars(nc->dev, nc); 118 *cpp = nc; 119 cpp = &nc->next; 120 121 if (bootverbose) { 122 device_printf(dev, "%d \"%s\":", i, name); 123 if (mw > 0) { 124 printf(" memory windows %d", mwu); 125 if (mw > 1) 126 printf("-%d", mwu + mw - 1); 127 } 128 if (spad > 0) { 129 printf(" scratchpads %d", spadu); 130 if (spad > 1) 131 printf("-%d", spadu + spad - 1); 132 } 133 if (db > 0) { 134 printf(" doorbells %d", dbu); 135 if (db > 1) 136 printf("-%d", dbu + db - 1); 137 } 138 printf("\n"); 139 } 140 141 mwu += mw; 142 spadu += spad; 143 dbu += db; 144 i++; 145 } 146 147 bus_generic_attach(dev); 148 return (0); 149} 150 151int 152ntb_unregister_device(device_t dev) 153{ 154 struct ntb_child **cpp = device_get_softc(dev); 155 struct ntb_child *nc; 156 int error = 0; 157 158 while ((nc = *cpp) != NULL) { 159 *cpp = (*cpp)->next; 160 error = device_delete_child(dev, nc->dev); 161 if (error) 162 break; 163 rm_destroy(&nc->ctx_lock); 164 free(nc, M_DEVBUF); 165 } 166 return (error); 167} 168 169int 170ntb_child_location_str(device_t dev, device_t child, char *buf, 171 size_t buflen) 172{ 173 struct ntb_child *nc = device_get_ivars(child); 174 175 snprintf(buf, buflen, "function=%d", nc->function); 176 return (0); 177} 178 179int 180ntb_print_child(device_t dev, device_t child) 181{ 182 struct ntb_child *nc = device_get_ivars(child); 183 int retval; 184 185 retval = bus_print_child_header(dev, child); 186 if (nc->mwcnt > 0) { 187 printf(" mw %d", nc->mwoff); 188 if (nc->mwcnt > 1) 189 printf("-%d", nc->mwoff + nc->mwcnt - 1); 190 } 191 if (nc->spadcnt > 0) { 192 printf(" spad %d", nc->spadoff); 193 if (nc->spadcnt > 1) 194 printf("-%d", nc->spadoff + nc->spadcnt - 1); 195 } 196 if (nc->dbcnt > 0) { 197 printf(" db %d", nc->dboff); 198 if (nc->dbcnt > 1) 199 printf("-%d", nc->dboff + nc->dbcnt - 1); 200 } 201 retval += printf(" at function %d", nc->function); 202 retval += bus_print_child_domain(dev, child); 203 retval += bus_print_child_footer(dev, child); 204 205 return (retval); 206} 207 208bus_dma_tag_t 209ntb_get_dma_tag(device_t bus, device_t child) 210{ 211 212 return (bus_get_dma_tag(bus)); 213} 214 215void 216ntb_link_event(device_t dev) 217{ 218 struct ntb_child **cpp = device_get_softc(dev); 219 struct ntb_child *nc; 220 struct rm_priotracker ctx_tracker; 221 enum ntb_speed speed; 222 enum ntb_width width; 223 224 if (NTB_LINK_IS_UP(dev, &speed, &width)) { 225 device_printf(dev, "Link is up (PCIe %d.x / x%d)\n", 226 (int)speed, (int)width); 227 } else { 228 device_printf(dev, "Link is down\n"); 229 } 230 for (nc = *cpp; nc != NULL; nc = nc->next) { 231 rm_rlock(&nc->ctx_lock, &ctx_tracker); 232 if (nc->ctx_ops != NULL && nc->ctx_ops->link_event != NULL) 233 nc->ctx_ops->link_event(nc->ctx); 234 rm_runlock(&nc->ctx_lock, &ctx_tracker); 235 } 236} 237 238void 239ntb_db_event(device_t dev, uint32_t vec) 240{ 241 struct ntb_child **cpp = device_get_softc(dev); 242 struct ntb_child *nc; 243 struct rm_priotracker ctx_tracker; 244 245 for (nc = *cpp; nc != NULL; nc = nc->next) { 246 rm_rlock(&nc->ctx_lock, &ctx_tracker); 247 if (nc->ctx_ops != NULL && nc->ctx_ops->db_event != NULL) 248 nc->ctx_ops->db_event(nc->ctx, vec); 249 rm_runlock(&nc->ctx_lock, &ctx_tracker); 250 } 251} 252 253bool 254ntb_link_is_up(device_t ntb, enum ntb_speed *speed, enum ntb_width *width) 255{ 256 257 return (NTB_LINK_IS_UP(device_get_parent(ntb), speed, width)); 258} 259 260int 261ntb_link_enable(device_t ntb, enum ntb_speed speed, enum ntb_width width) 262{ 263 struct ntb_child *nc = device_get_ivars(ntb); 264 struct ntb_child **cpp = device_get_softc(device_get_parent(nc->dev)); 265 struct ntb_child *nc1; 266 267 for (nc1 = *cpp; nc1 != NULL; nc1 = nc1->next) { 268 if (nc1->enabled) { 269 nc->enabled = 1; 270 return (0); 271 } 272 } 273 nc->enabled = 1; 274 return (NTB_LINK_ENABLE(device_get_parent(ntb), speed, width)); 275} 276 277int 278ntb_link_disable(device_t ntb) 279{ 280 struct ntb_child *nc = device_get_ivars(ntb); 281 struct ntb_child **cpp = device_get_softc(device_get_parent(nc->dev)); 282 struct ntb_child *nc1; 283 284 if (!nc->enabled) 285 return (0); 286 nc->enabled = 0; 287 for (nc1 = *cpp; nc1 != NULL; nc1 = nc1->next) { 288 if (nc1->enabled) 289 return (0); 290 } 291 return (NTB_LINK_DISABLE(device_get_parent(ntb))); 292} 293 294bool 295ntb_link_enabled(device_t ntb) 296{ 297 struct ntb_child *nc = device_get_ivars(ntb); 298 299 return (nc->enabled && NTB_LINK_ENABLED(device_get_parent(ntb))); 300} 301 302int 303ntb_set_ctx(device_t ntb, void *ctx, const struct ntb_ctx_ops *ctx_ops) 304{ 305 struct ntb_child *nc = device_get_ivars(ntb); 306 307 if (ctx == NULL || ctx_ops == NULL) 308 return (EINVAL); 309 310 rm_wlock(&nc->ctx_lock); 311 if (nc->ctx_ops != NULL) { 312 rm_wunlock(&nc->ctx_lock); 313 return (EINVAL); 314 } 315 nc->ctx = ctx; 316 nc->ctx_ops = ctx_ops; 317 318 /* 319 * If applicaiton driver asks for link events, generate fake one now 320 * to let it update link state without races while we hold the lock. 321 */ 322 if (ctx_ops->link_event != NULL) 323 ctx_ops->link_event(ctx); 324 rm_wunlock(&nc->ctx_lock); 325 326 return (0); 327} 328 329void * 330ntb_get_ctx(device_t ntb, const struct ntb_ctx_ops **ctx_ops) 331{ 332 struct ntb_child *nc = device_get_ivars(ntb); 333 334 KASSERT(nc->ctx != NULL && nc->ctx_ops != NULL, ("bogus")); 335 if (ctx_ops != NULL) 336 *ctx_ops = nc->ctx_ops; 337 return (nc->ctx); 338} 339 340void 341ntb_clear_ctx(device_t ntb) 342{ 343 struct ntb_child *nc = device_get_ivars(ntb); 344 345 rm_wlock(&nc->ctx_lock); 346 nc->ctx = NULL; 347 nc->ctx_ops = NULL; 348 rm_wunlock(&nc->ctx_lock); 349} 350 351uint8_t 352ntb_mw_count(device_t ntb) 353{ 354 struct ntb_child *nc = device_get_ivars(ntb); 355 356 return (nc->mwcnt); 357} 358 359int 360ntb_mw_get_range(device_t ntb, unsigned mw_idx, vm_paddr_t *base, 361 caddr_t *vbase, size_t *size, size_t *align, size_t *align_size, 362 bus_addr_t *plimit) 363{ 364 struct ntb_child *nc = device_get_ivars(ntb); 365 366 return (NTB_MW_GET_RANGE(device_get_parent(ntb), mw_idx + nc->mwoff, 367 base, vbase, size, align, align_size, plimit)); 368} 369 370int 371ntb_mw_set_trans(device_t ntb, unsigned mw_idx, bus_addr_t addr, size_t size) 372{ 373 struct ntb_child *nc = device_get_ivars(ntb); 374 375 return (NTB_MW_SET_TRANS(device_get_parent(ntb), mw_idx + nc->mwoff, 376 addr, size)); 377} 378 379int 380ntb_mw_clear_trans(device_t ntb, unsigned mw_idx) 381{ 382 struct ntb_child *nc = device_get_ivars(ntb); 383 384 return (NTB_MW_CLEAR_TRANS(device_get_parent(ntb), mw_idx + nc->mwoff)); 385} 386 387int 388ntb_mw_get_wc(device_t ntb, unsigned mw_idx, vm_memattr_t *mode) 389{ 390 struct ntb_child *nc = device_get_ivars(ntb); 391 392 return (NTB_MW_GET_WC(device_get_parent(ntb), mw_idx + nc->mwoff, mode)); 393} 394 395int 396ntb_mw_set_wc(device_t ntb, unsigned mw_idx, vm_memattr_t mode) 397{ 398 struct ntb_child *nc = device_get_ivars(ntb); 399 400 return (NTB_MW_SET_WC(device_get_parent(ntb), mw_idx + nc->mwoff, mode)); 401} 402 403uint8_t 404ntb_spad_count(device_t ntb) 405{ 406 struct ntb_child *nc = device_get_ivars(ntb); 407 408 return (nc->spadcnt); 409} 410 411void 412ntb_spad_clear(device_t ntb) 413{ 414 struct ntb_child *nc = device_get_ivars(ntb); 415 unsigned i; 416 417 for (i = 0; i < nc->spadcnt; i++) 418 NTB_SPAD_WRITE(device_get_parent(ntb), i + nc->spadoff, 0); 419} 420 421int 422ntb_spad_write(device_t ntb, unsigned int idx, uint32_t val) 423{ 424 struct ntb_child *nc = device_get_ivars(ntb); 425 426 return (NTB_SPAD_WRITE(device_get_parent(ntb), idx + nc->spadoff, val)); 427} 428 429int 430ntb_spad_read(device_t ntb, unsigned int idx, uint32_t *val) 431{ 432 struct ntb_child *nc = device_get_ivars(ntb); 433 434 return (NTB_SPAD_READ(device_get_parent(ntb), idx + nc->spadoff, val)); 435} 436 437int 438ntb_peer_spad_write(device_t ntb, unsigned int idx, uint32_t val) 439{ 440 struct ntb_child *nc = device_get_ivars(ntb); 441 442 return (NTB_PEER_SPAD_WRITE(device_get_parent(ntb), idx + nc->spadoff, 443 val)); 444} 445 446int 447ntb_peer_spad_read(device_t ntb, unsigned int idx, uint32_t *val) 448{ 449 struct ntb_child *nc = device_get_ivars(ntb); 450 451 return (NTB_PEER_SPAD_READ(device_get_parent(ntb), idx + nc->spadoff, 452 val)); 453} 454 455uint64_t 456ntb_db_valid_mask(device_t ntb) 457{ 458 struct ntb_child *nc = device_get_ivars(ntb); 459 460 return (nc->dbmask); 461} 462 463int 464ntb_db_vector_count(device_t ntb) 465{ 466 467 return (NTB_DB_VECTOR_COUNT(device_get_parent(ntb))); 468} 469 470uint64_t 471ntb_db_vector_mask(device_t ntb, uint32_t vector) 472{ 473 struct ntb_child *nc = device_get_ivars(ntb); 474 475 return ((NTB_DB_VECTOR_MASK(device_get_parent(ntb), vector) 476 >> nc->dboff) & nc->dbmask); 477} 478 479int 480ntb_peer_db_addr(device_t ntb, bus_addr_t *db_addr, vm_size_t *db_size) 481{ 482 483 return (NTB_PEER_DB_ADDR(device_get_parent(ntb), db_addr, db_size)); 484} 485 486void 487ntb_db_clear(device_t ntb, uint64_t bits) 488{ 489 struct ntb_child *nc = device_get_ivars(ntb); 490 491 return (NTB_DB_CLEAR(device_get_parent(ntb), bits << nc->dboff)); 492} 493 494void 495ntb_db_clear_mask(device_t ntb, uint64_t bits) 496{ 497 struct ntb_child *nc = device_get_ivars(ntb); 498 499 return (NTB_DB_CLEAR_MASK(device_get_parent(ntb), bits << nc->dboff)); 500} 501 502uint64_t 503ntb_db_read(device_t ntb) 504{ 505 struct ntb_child *nc = device_get_ivars(ntb); 506 507 return ((NTB_DB_READ(device_get_parent(ntb)) >> nc->dboff) 508 & nc->dbmask); 509} 510 511void 512ntb_db_set_mask(device_t ntb, uint64_t bits) 513{ 514 struct ntb_child *nc = device_get_ivars(ntb); 515 516 return (NTB_DB_SET_MASK(device_get_parent(ntb), bits << nc->dboff)); 517} 518 519void 520ntb_peer_db_set(device_t ntb, uint64_t bits) 521{ 522 struct ntb_child *nc = device_get_ivars(ntb); 523 524 return (NTB_PEER_DB_SET(device_get_parent(ntb), bits << nc->dboff)); 525} 526 527MODULE_VERSION(ntb, 1); 528