1 /* ldc.c: Logical Domain Channel link-layer protocol driver. 2 * 3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/export.h> 8 #include <linux/slab.h> 9 #include <linux/spinlock.h> 10 #include <linux/delay.h> 11 #include <linux/errno.h> 12 #include <linux/string.h> 13 #include <linux/scatterlist.h> 14 #include <linux/interrupt.h> 15 #include <linux/list.h> 16 #include <linux/init.h> 17 #include <linux/bitmap.h> 18 #include <linux/iommu-common.h> 19 20 #include <asm/hypervisor.h> 21 #include <asm/iommu.h> 22 #include <asm/page.h> 23 #include <asm/ldc.h> 24 #include <asm/mdesc.h> 25 26 #define DRV_MODULE_NAME "ldc" 27 #define PFX DRV_MODULE_NAME ": " 28 #define DRV_MODULE_VERSION "1.1" 29 #define DRV_MODULE_RELDATE "July 22, 2008" 30 31 #define COOKIE_PGSZ_CODE 0xf000000000000000ULL 32 #define COOKIE_PGSZ_CODE_SHIFT 60ULL 33 34 35 static char version[] = 36 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 37 #define LDC_PACKET_SIZE 64 38 39 /* Packet header layout for unreliable and reliable mode frames. 40 * When in RAW mode, packets are simply straight 64-byte payloads 41 * with no headers. 42 */ 43 struct ldc_packet { 44 u8 type; 45 #define LDC_CTRL 0x01 46 #define LDC_DATA 0x02 47 #define LDC_ERR 0x10 48 49 u8 stype; 50 #define LDC_INFO 0x01 51 #define LDC_ACK 0x02 52 #define LDC_NACK 0x04 53 54 u8 ctrl; 55 #define LDC_VERS 0x01 /* Link Version */ 56 #define LDC_RTS 0x02 /* Request To Send */ 57 #define LDC_RTR 0x03 /* Ready To Receive */ 58 #define LDC_RDX 0x04 /* Ready for Data eXchange */ 59 #define LDC_CTRL_MSK 0x0f 60 61 u8 env; 62 #define LDC_LEN 0x3f 63 #define LDC_FRAG_MASK 0xc0 64 #define LDC_START 0x40 65 #define LDC_STOP 0x80 66 67 u32 seqid; 68 69 union { 70 u8 u_data[LDC_PACKET_SIZE - 8]; 71 struct { 72 u32 pad; 73 u32 ackid; 74 u8 r_data[LDC_PACKET_SIZE - 8 - 8]; 75 } r; 76 } u; 77 }; 78 79 struct ldc_version { 80 u16 major; 81 u16 minor; 82 }; 83 84 /* Ordered from largest major to lowest. */ 85 static struct ldc_version ver_arr[] = { 86 { .major = 1, .minor = 0 }, 87 }; 88 89 #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE) 90 #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE) 91 92 struct ldc_channel; 93 94 struct ldc_mode_ops { 95 int (*write)(struct ldc_channel *, const void *, unsigned int); 96 int (*read)(struct ldc_channel *, void *, unsigned int); 97 }; 98 99 static const struct ldc_mode_ops raw_ops; 100 static const struct ldc_mode_ops nonraw_ops; 101 static const struct ldc_mode_ops stream_ops; 102 103 int ldom_domaining_enabled; 104 105 struct ldc_iommu { 106 /* Protects ldc_unmap. */ 107 spinlock_t lock; 108 struct ldc_mtable_entry *page_table; 109 struct iommu_map_table iommu_map_table; 110 }; 111 112 struct ldc_channel { 113 /* Protects all operations that depend upon channel state. */ 114 spinlock_t lock; 115 116 unsigned long id; 117 118 u8 *mssbuf; 119 u32 mssbuf_len; 120 u32 mssbuf_off; 121 122 struct ldc_packet *tx_base; 123 unsigned long tx_head; 124 unsigned long tx_tail; 125 unsigned long tx_num_entries; 126 unsigned long tx_ra; 127 128 unsigned long tx_acked; 129 130 struct ldc_packet *rx_base; 131 unsigned long rx_head; 132 unsigned long rx_tail; 133 unsigned long rx_num_entries; 134 unsigned long rx_ra; 135 136 u32 rcv_nxt; 137 u32 snd_nxt; 138 139 unsigned long chan_state; 140 141 struct ldc_channel_config cfg; 142 void *event_arg; 143 144 const struct ldc_mode_ops *mops; 145 146 struct ldc_iommu iommu; 147 148 struct ldc_version ver; 149 150 u8 hs_state; 151 #define LDC_HS_CLOSED 0x00 152 #define LDC_HS_OPEN 0x01 153 #define LDC_HS_GOTVERS 0x02 154 #define LDC_HS_SENTRTR 0x03 155 #define LDC_HS_GOTRTR 0x04 156 #define LDC_HS_COMPLETE 0x10 157 158 u8 flags; 159 #define LDC_FLAG_ALLOCED_QUEUES 0x01 160 #define LDC_FLAG_REGISTERED_QUEUES 0x02 161 #define LDC_FLAG_REGISTERED_IRQS 0x04 162 #define LDC_FLAG_RESET 0x10 163 164 u8 mss; 165 u8 state; 166 167 #define LDC_IRQ_NAME_MAX 32 168 char rx_irq_name[LDC_IRQ_NAME_MAX]; 169 char tx_irq_name[LDC_IRQ_NAME_MAX]; 170 171 struct hlist_head mh_list; 172 173 struct hlist_node list; 174 }; 175 176 #define ldcdbg(TYPE, f, a...) \ 177 do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \ 178 printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \ 179 } while (0) 180 181 static const char *state_to_str(u8 state) 182 { 183 switch (state) { 184 case LDC_STATE_INVALID: 185 return "INVALID"; 186 case LDC_STATE_INIT: 187 return "INIT"; 188 case LDC_STATE_BOUND: 189 return "BOUND"; 190 case LDC_STATE_READY: 191 return "READY"; 192 case LDC_STATE_CONNECTED: 193 return "CONNECTED"; 194 default: 195 return "<UNKNOWN>"; 196 } 197 } 198 199 static void ldc_set_state(struct ldc_channel *lp, u8 state) 200 { 201 ldcdbg(STATE, "STATE (%s) --> (%s)\n", 202 state_to_str(lp->state), 203 state_to_str(state)); 204 205 lp->state = state; 206 } 207 208 static unsigned long __advance(unsigned long off, unsigned long num_entries) 209 { 210 off += LDC_PACKET_SIZE; 211 if (off == (num_entries * LDC_PACKET_SIZE)) 212 off = 0; 213 214 return off; 215 } 216 217 static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off) 218 { 219 return __advance(off, lp->rx_num_entries); 220 } 221 222 static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off) 223 { 224 return __advance(off, lp->tx_num_entries); 225 } 226 227 static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp, 228 unsigned long *new_tail) 229 { 230 struct ldc_packet *p; 231 unsigned long t; 232 233 t = tx_advance(lp, lp->tx_tail); 234 if (t == lp->tx_head) 235 return NULL; 236 237 *new_tail = t; 238 239 p = lp->tx_base; 240 return p + (lp->tx_tail / LDC_PACKET_SIZE); 241 } 242 243 /* When we are in reliable or stream mode, have to track the next packet 244 * we haven't gotten an ACK for in the TX queue using tx_acked. We have 245 * to be careful not to stomp over the queue past that point. During 246 * the handshake, we don't have TX data packets pending in the queue 247 * and that's why handshake_get_tx_packet() need not be mindful of 248 * lp->tx_acked. 249 */ 250 static unsigned long head_for_data(struct ldc_channel *lp) 251 { 252 if (lp->cfg.mode == LDC_MODE_STREAM) 253 return lp->tx_acked; 254 return lp->tx_head; 255 } 256 257 static int tx_has_space_for(struct ldc_channel *lp, unsigned int size) 258 { 259 unsigned long limit, tail, new_tail, diff; 260 unsigned int mss; 261 262 limit = head_for_data(lp); 263 tail = lp->tx_tail; 264 new_tail = tx_advance(lp, tail); 265 if (new_tail == limit) 266 return 0; 267 268 if (limit > new_tail) 269 diff = limit - new_tail; 270 else 271 diff = (limit + 272 ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail)); 273 diff /= LDC_PACKET_SIZE; 274 mss = lp->mss; 275 276 if (diff * mss < size) 277 return 0; 278 279 return 1; 280 } 281 282 static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp, 283 unsigned long *new_tail) 284 { 285 struct ldc_packet *p; 286 unsigned long h, t; 287 288 h = head_for_data(lp); 289 t = tx_advance(lp, lp->tx_tail); 290 if (t == h) 291 return NULL; 292 293 *new_tail = t; 294 295 p = lp->tx_base; 296 return p + (lp->tx_tail / LDC_PACKET_SIZE); 297 } 298 299 static int set_tx_tail(struct ldc_channel *lp, unsigned long tail) 300 { 301 unsigned long orig_tail = lp->tx_tail; 302 int limit = 1000; 303 304 lp->tx_tail = tail; 305 while (limit-- > 0) { 306 unsigned long err; 307 308 err = sun4v_ldc_tx_set_qtail(lp->id, tail); 309 if (!err) 310 return 0; 311 312 if (err != HV_EWOULDBLOCK) { 313 lp->tx_tail = orig_tail; 314 return -EINVAL; 315 } 316 udelay(1); 317 } 318 319 lp->tx_tail = orig_tail; 320 return -EBUSY; 321 } 322 323 /* This just updates the head value in the hypervisor using 324 * a polling loop with a timeout. The caller takes care of 325 * upating software state representing the head change, if any. 326 */ 327 static int __set_rx_head(struct ldc_channel *lp, unsigned long head) 328 { 329 int limit = 1000; 330 331 while (limit-- > 0) { 332 unsigned long err; 333 334 err = sun4v_ldc_rx_set_qhead(lp->id, head); 335 if (!err) 336 return 0; 337 338 if (err != HV_EWOULDBLOCK) 339 return -EINVAL; 340 341 udelay(1); 342 } 343 344 return -EBUSY; 345 } 346 347 static int send_tx_packet(struct ldc_channel *lp, 348 struct ldc_packet *p, 349 unsigned long new_tail) 350 { 351 BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE))); 352 353 return set_tx_tail(lp, new_tail); 354 } 355 356 static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp, 357 u8 stype, u8 ctrl, 358 void *data, int dlen, 359 unsigned long *new_tail) 360 { 361 struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail); 362 363 if (p) { 364 memset(p, 0, sizeof(*p)); 365 p->type = LDC_CTRL; 366 p->stype = stype; 367 p->ctrl = ctrl; 368 if (data) 369 memcpy(p->u.u_data, data, dlen); 370 } 371 return p; 372 } 373 374 static int start_handshake(struct ldc_channel *lp) 375 { 376 struct ldc_packet *p; 377 struct ldc_version *ver; 378 unsigned long new_tail; 379 380 ver = &ver_arr[0]; 381 382 ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n", 383 ver->major, ver->minor); 384 385 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, 386 ver, sizeof(*ver), &new_tail); 387 if (p) { 388 int err = send_tx_packet(lp, p, new_tail); 389 if (!err) 390 lp->flags &= ~LDC_FLAG_RESET; 391 return err; 392 } 393 return -EBUSY; 394 } 395 396 static int send_version_nack(struct ldc_channel *lp, 397 u16 major, u16 minor) 398 { 399 struct ldc_packet *p; 400 struct ldc_version ver; 401 unsigned long new_tail; 402 403 ver.major = major; 404 ver.minor = minor; 405 406 p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS, 407 &ver, sizeof(ver), &new_tail); 408 if (p) { 409 ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n", 410 ver.major, ver.minor); 411 412 return send_tx_packet(lp, p, new_tail); 413 } 414 return -EBUSY; 415 } 416 417 static int send_version_ack(struct ldc_channel *lp, 418 struct ldc_version *vp) 419 { 420 struct ldc_packet *p; 421 unsigned long new_tail; 422 423 p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS, 424 vp, sizeof(*vp), &new_tail); 425 if (p) { 426 ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n", 427 vp->major, vp->minor); 428 429 return send_tx_packet(lp, p, new_tail); 430 } 431 return -EBUSY; 432 } 433 434 static int send_rts(struct ldc_channel *lp) 435 { 436 struct ldc_packet *p; 437 unsigned long new_tail; 438 439 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0, 440 &new_tail); 441 if (p) { 442 p->env = lp->cfg.mode; 443 p->seqid = 0; 444 lp->rcv_nxt = 0; 445 446 ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n", 447 p->env, p->seqid); 448 449 return send_tx_packet(lp, p, new_tail); 450 } 451 return -EBUSY; 452 } 453 454 static int send_rtr(struct ldc_channel *lp) 455 { 456 struct ldc_packet *p; 457 unsigned long new_tail; 458 459 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0, 460 &new_tail); 461 if (p) { 462 p->env = lp->cfg.mode; 463 p->seqid = 0; 464 465 ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n", 466 p->env, p->seqid); 467 468 return send_tx_packet(lp, p, new_tail); 469 } 470 return -EBUSY; 471 } 472 473 static int send_rdx(struct ldc_channel *lp) 474 { 475 struct ldc_packet *p; 476 unsigned long new_tail; 477 478 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0, 479 &new_tail); 480 if (p) { 481 p->env = 0; 482 p->seqid = ++lp->snd_nxt; 483 p->u.r.ackid = lp->rcv_nxt; 484 485 ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n", 486 p->env, p->seqid, p->u.r.ackid); 487 488 return send_tx_packet(lp, p, new_tail); 489 } 490 return -EBUSY; 491 } 492 493 static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt) 494 { 495 struct ldc_packet *p; 496 unsigned long new_tail; 497 int err; 498 499 p = data_get_tx_packet(lp, &new_tail); 500 if (!p) 501 return -EBUSY; 502 memset(p, 0, sizeof(*p)); 503 p->type = data_pkt->type; 504 p->stype = LDC_NACK; 505 p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK; 506 p->seqid = lp->snd_nxt + 1; 507 p->u.r.ackid = lp->rcv_nxt; 508 509 ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n", 510 p->type, p->ctrl, p->seqid, p->u.r.ackid); 511 512 err = send_tx_packet(lp, p, new_tail); 513 if (!err) 514 lp->snd_nxt++; 515 516 return err; 517 } 518 519 static int ldc_abort(struct ldc_channel *lp) 520 { 521 unsigned long hv_err; 522 523 ldcdbg(STATE, "ABORT\n"); 524 525 /* We report but do not act upon the hypervisor errors because 526 * there really isn't much we can do if they fail at this point. 527 */ 528 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); 529 if (hv_err) 530 printk(KERN_ERR PFX "ldc_abort: " 531 "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n", 532 lp->id, lp->tx_ra, lp->tx_num_entries, hv_err); 533 534 hv_err = sun4v_ldc_tx_get_state(lp->id, 535 &lp->tx_head, 536 &lp->tx_tail, 537 &lp->chan_state); 538 if (hv_err) 539 printk(KERN_ERR PFX "ldc_abort: " 540 "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n", 541 lp->id, hv_err); 542 543 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); 544 if (hv_err) 545 printk(KERN_ERR PFX "ldc_abort: " 546 "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n", 547 lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); 548 549 /* Refetch the RX queue state as well, because we could be invoked 550 * here in the queue processing context. 551 */ 552 hv_err = sun4v_ldc_rx_get_state(lp->id, 553 &lp->rx_head, 554 &lp->rx_tail, 555 &lp->chan_state); 556 if (hv_err) 557 printk(KERN_ERR PFX "ldc_abort: " 558 "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n", 559 lp->id, hv_err); 560 561 return -ECONNRESET; 562 } 563 564 static struct ldc_version *find_by_major(u16 major) 565 { 566 struct ldc_version *ret = NULL; 567 int i; 568 569 for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { 570 struct ldc_version *v = &ver_arr[i]; 571 if (v->major <= major) { 572 ret = v; 573 break; 574 } 575 } 576 return ret; 577 } 578 579 static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) 580 { 581 struct ldc_version *vap; 582 int err; 583 584 ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n", 585 vp->major, vp->minor); 586 587 if (lp->hs_state == LDC_HS_GOTVERS) { 588 lp->hs_state = LDC_HS_OPEN; 589 memset(&lp->ver, 0, sizeof(lp->ver)); 590 } 591 592 vap = find_by_major(vp->major); 593 if (!vap) { 594 err = send_version_nack(lp, 0, 0); 595 } else if (vap->major != vp->major) { 596 err = send_version_nack(lp, vap->major, vap->minor); 597 } else { 598 struct ldc_version ver = *vp; 599 if (ver.minor > vap->minor) 600 ver.minor = vap->minor; 601 err = send_version_ack(lp, &ver); 602 if (!err) { 603 lp->ver = ver; 604 lp->hs_state = LDC_HS_GOTVERS; 605 } 606 } 607 if (err) 608 return ldc_abort(lp); 609 610 return 0; 611 } 612 613 static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp) 614 { 615 ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n", 616 vp->major, vp->minor); 617 618 if (lp->hs_state == LDC_HS_GOTVERS) { 619 if (lp->ver.major != vp->major || 620 lp->ver.minor != vp->minor) 621 return ldc_abort(lp); 622 } else { 623 lp->ver = *vp; 624 lp->hs_state = LDC_HS_GOTVERS; 625 } 626 if (send_rts(lp)) 627 return ldc_abort(lp); 628 return 0; 629 } 630 631 static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp) 632 { 633 struct ldc_version *vap; 634 struct ldc_packet *p; 635 unsigned long new_tail; 636 637 if (vp->major == 0 && vp->minor == 0) 638 return ldc_abort(lp); 639 640 vap = find_by_major(vp->major); 641 if (!vap) 642 return ldc_abort(lp); 643 644 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, 645 vap, sizeof(*vap), 646 &new_tail); 647 if (!p) 648 return ldc_abort(lp); 649 650 return send_tx_packet(lp, p, new_tail); 651 } 652 653 static int process_version(struct ldc_channel *lp, 654 struct ldc_packet *p) 655 { 656 struct ldc_version *vp; 657 658 vp = (struct ldc_version *) p->u.u_data; 659 660 switch (p->stype) { 661 case LDC_INFO: 662 return process_ver_info(lp, vp); 663 664 case LDC_ACK: 665 return process_ver_ack(lp, vp); 666 667 case LDC_NACK: 668 return process_ver_nack(lp, vp); 669 670 default: 671 return ldc_abort(lp); 672 } 673 } 674 675 static int process_rts(struct ldc_channel *lp, 676 struct ldc_packet *p) 677 { 678 ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n", 679 p->stype, p->seqid, p->env); 680 681 if (p->stype != LDC_INFO || 682 lp->hs_state != LDC_HS_GOTVERS || 683 p->env != lp->cfg.mode) 684 return ldc_abort(lp); 685 686 lp->snd_nxt = p->seqid; 687 lp->rcv_nxt = p->seqid; 688 lp->hs_state = LDC_HS_SENTRTR; 689 if (send_rtr(lp)) 690 return ldc_abort(lp); 691 692 return 0; 693 } 694 695 static int process_rtr(struct ldc_channel *lp, 696 struct ldc_packet *p) 697 { 698 ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n", 699 p->stype, p->seqid, p->env); 700 701 if (p->stype != LDC_INFO || 702 p->env != lp->cfg.mode) 703 return ldc_abort(lp); 704 705 lp->snd_nxt = p->seqid; 706 lp->hs_state = LDC_HS_COMPLETE; 707 ldc_set_state(lp, LDC_STATE_CONNECTED); 708 send_rdx(lp); 709 710 return LDC_EVENT_UP; 711 } 712 713 static int rx_seq_ok(struct ldc_channel *lp, u32 seqid) 714 { 715 return lp->rcv_nxt + 1 == seqid; 716 } 717 718 static int process_rdx(struct ldc_channel *lp, 719 struct ldc_packet *p) 720 { 721 ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n", 722 p->stype, p->seqid, p->env, p->u.r.ackid); 723 724 if (p->stype != LDC_INFO || 725 !(rx_seq_ok(lp, p->seqid))) 726 return ldc_abort(lp); 727 728 lp->rcv_nxt = p->seqid; 729 730 lp->hs_state = LDC_HS_COMPLETE; 731 ldc_set_state(lp, LDC_STATE_CONNECTED); 732 733 return LDC_EVENT_UP; 734 } 735 736 static int process_control_frame(struct ldc_channel *lp, 737 struct ldc_packet *p) 738 { 739 switch (p->ctrl) { 740 case LDC_VERS: 741 return process_version(lp, p); 742 743 case LDC_RTS: 744 return process_rts(lp, p); 745 746 case LDC_RTR: 747 return process_rtr(lp, p); 748 749 case LDC_RDX: 750 return process_rdx(lp, p); 751 752 default: 753 return ldc_abort(lp); 754 } 755 } 756 757 static int process_error_frame(struct ldc_channel *lp, 758 struct ldc_packet *p) 759 { 760 return ldc_abort(lp); 761 } 762 763 static int process_data_ack(struct ldc_channel *lp, 764 struct ldc_packet *ack) 765 { 766 unsigned long head = lp->tx_acked; 767 u32 ackid = ack->u.r.ackid; 768 769 while (1) { 770 struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE); 771 772 head = tx_advance(lp, head); 773 774 if (p->seqid == ackid) { 775 lp->tx_acked = head; 776 return 0; 777 } 778 if (head == lp->tx_tail) 779 return ldc_abort(lp); 780 } 781 782 return 0; 783 } 784 785 static void send_events(struct ldc_channel *lp, unsigned int event_mask) 786 { 787 if (event_mask & LDC_EVENT_RESET) 788 lp->cfg.event(lp->event_arg, LDC_EVENT_RESET); 789 if (event_mask & LDC_EVENT_UP) 790 lp->cfg.event(lp->event_arg, LDC_EVENT_UP); 791 if (event_mask & LDC_EVENT_DATA_READY) 792 lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY); 793 } 794 795 static irqreturn_t ldc_rx(int irq, void *dev_id) 796 { 797 struct ldc_channel *lp = dev_id; 798 unsigned long orig_state, flags; 799 unsigned int event_mask; 800 801 spin_lock_irqsave(&lp->lock, flags); 802 803 orig_state = lp->chan_state; 804 805 /* We should probably check for hypervisor errors here and 806 * reset the LDC channel if we get one. 807 */ 808 sun4v_ldc_rx_get_state(lp->id, 809 &lp->rx_head, 810 &lp->rx_tail, 811 &lp->chan_state); 812 813 ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", 814 orig_state, lp->chan_state, lp->rx_head, lp->rx_tail); 815 816 event_mask = 0; 817 818 if (lp->cfg.mode == LDC_MODE_RAW && 819 lp->chan_state == LDC_CHANNEL_UP) { 820 lp->hs_state = LDC_HS_COMPLETE; 821 ldc_set_state(lp, LDC_STATE_CONNECTED); 822 823 event_mask |= LDC_EVENT_UP; 824 825 orig_state = lp->chan_state; 826 } 827 828 /* If we are in reset state, flush the RX queue and ignore 829 * everything. 830 */ 831 if (lp->flags & LDC_FLAG_RESET) { 832 (void) __set_rx_head(lp, lp->rx_tail); 833 goto out; 834 } 835 836 /* Once we finish the handshake, we let the ldc_read() 837 * paths do all of the control frame and state management. 838 * Just trigger the callback. 839 */ 840 if (lp->hs_state == LDC_HS_COMPLETE) { 841 handshake_complete: 842 if (lp->chan_state != orig_state) { 843 unsigned int event = LDC_EVENT_RESET; 844 845 if (lp->chan_state == LDC_CHANNEL_UP) 846 event = LDC_EVENT_UP; 847 848 event_mask |= event; 849 } 850 if (lp->rx_head != lp->rx_tail) 851 event_mask |= LDC_EVENT_DATA_READY; 852 853 goto out; 854 } 855 856 if (lp->chan_state != orig_state) 857 goto out; 858 859 while (lp->rx_head != lp->rx_tail) { 860 struct ldc_packet *p; 861 unsigned long new; 862 int err; 863 864 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); 865 866 switch (p->type) { 867 case LDC_CTRL: 868 err = process_control_frame(lp, p); 869 if (err > 0) 870 event_mask |= err; 871 break; 872 873 case LDC_DATA: 874 event_mask |= LDC_EVENT_DATA_READY; 875 err = 0; 876 break; 877 878 case LDC_ERR: 879 err = process_error_frame(lp, p); 880 break; 881 882 default: 883 err = ldc_abort(lp); 884 break; 885 } 886 887 if (err < 0) 888 break; 889 890 new = lp->rx_head; 891 new += LDC_PACKET_SIZE; 892 if (new == (lp->rx_num_entries * LDC_PACKET_SIZE)) 893 new = 0; 894 lp->rx_head = new; 895 896 err = __set_rx_head(lp, new); 897 if (err < 0) { 898 (void) ldc_abort(lp); 899 break; 900 } 901 if (lp->hs_state == LDC_HS_COMPLETE) 902 goto handshake_complete; 903 } 904 905 out: 906 spin_unlock_irqrestore(&lp->lock, flags); 907 908 send_events(lp, event_mask); 909 910 return IRQ_HANDLED; 911 } 912 913 static irqreturn_t ldc_tx(int irq, void *dev_id) 914 { 915 struct ldc_channel *lp = dev_id; 916 unsigned long flags, orig_state; 917 unsigned int event_mask = 0; 918 919 spin_lock_irqsave(&lp->lock, flags); 920 921 orig_state = lp->chan_state; 922 923 /* We should probably check for hypervisor errors here and 924 * reset the LDC channel if we get one. 925 */ 926 sun4v_ldc_tx_get_state(lp->id, 927 &lp->tx_head, 928 &lp->tx_tail, 929 &lp->chan_state); 930 931 ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", 932 orig_state, lp->chan_state, lp->tx_head, lp->tx_tail); 933 934 if (lp->cfg.mode == LDC_MODE_RAW && 935 lp->chan_state == LDC_CHANNEL_UP) { 936 lp->hs_state = LDC_HS_COMPLETE; 937 ldc_set_state(lp, LDC_STATE_CONNECTED); 938 939 event_mask |= LDC_EVENT_UP; 940 } 941 942 spin_unlock_irqrestore(&lp->lock, flags); 943 944 send_events(lp, event_mask); 945 946 return IRQ_HANDLED; 947 } 948 949 /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so 950 * XXX that addition and removal from the ldc_channel_list has 951 * XXX atomicity, otherwise the __ldc_channel_exists() check is 952 * XXX totally pointless as another thread can slip into ldc_alloc() 953 * XXX and add a channel with the same ID. There also needs to be 954 * XXX a spinlock for ldc_channel_list. 955 */ 956 static HLIST_HEAD(ldc_channel_list); 957 958 static int __ldc_channel_exists(unsigned long id) 959 { 960 struct ldc_channel *lp; 961 962 hlist_for_each_entry(lp, &ldc_channel_list, list) { 963 if (lp->id == id) 964 return 1; 965 } 966 return 0; 967 } 968 969 static int alloc_queue(const char *name, unsigned long num_entries, 970 struct ldc_packet **base, unsigned long *ra) 971 { 972 unsigned long size, order; 973 void *q; 974 975 size = num_entries * LDC_PACKET_SIZE; 976 order = get_order(size); 977 978 q = (void *) __get_free_pages(GFP_KERNEL, order); 979 if (!q) { 980 printk(KERN_ERR PFX "Alloc of %s queue failed with " 981 "size=%lu order=%lu\n", name, size, order); 982 return -ENOMEM; 983 } 984 985 memset(q, 0, PAGE_SIZE << order); 986 987 *base = q; 988 *ra = __pa(q); 989 990 return 0; 991 } 992 993 static void free_queue(unsigned long num_entries, struct ldc_packet *q) 994 { 995 unsigned long size, order; 996 997 if (!q) 998 return; 999 1000 size = num_entries * LDC_PACKET_SIZE; 1001 order = get_order(size); 1002 1003 free_pages((unsigned long)q, order); 1004 } 1005 1006 static unsigned long ldc_cookie_to_index(u64 cookie, void *arg) 1007 { 1008 u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; 1009 /* struct ldc_iommu *ldc_iommu = (struct ldc_iommu *)arg; */ 1010 1011 cookie &= ~COOKIE_PGSZ_CODE; 1012 1013 return (cookie >> (13ULL + (szcode * 3ULL))); 1014 } 1015 1016 static void ldc_demap(struct ldc_iommu *iommu, unsigned long id, u64 cookie, 1017 unsigned long entry, unsigned long npages) 1018 { 1019 struct ldc_mtable_entry *base; 1020 unsigned long i, shift; 1021 1022 shift = (cookie >> COOKIE_PGSZ_CODE_SHIFT) * 3; 1023 base = iommu->page_table + entry; 1024 for (i = 0; i < npages; i++) { 1025 if (base->cookie) 1026 sun4v_ldc_revoke(id, cookie + (i << shift), 1027 base->cookie); 1028 base->mte = 0; 1029 } 1030 } 1031 1032 /* XXX Make this configurable... XXX */ 1033 #define LDC_IOTABLE_SIZE (8 * 1024) 1034 1035 static int ldc_iommu_init(const char *name, struct ldc_channel *lp) 1036 { 1037 unsigned long sz, num_tsb_entries, tsbsize, order; 1038 struct ldc_iommu *ldc_iommu = &lp->iommu; 1039 struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; 1040 struct ldc_mtable_entry *table; 1041 unsigned long hv_err; 1042 int err; 1043 1044 num_tsb_entries = LDC_IOTABLE_SIZE; 1045 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); 1046 spin_lock_init(&ldc_iommu->lock); 1047 1048 sz = num_tsb_entries / 8; 1049 sz = (sz + 7UL) & ~7UL; 1050 iommu->map = kzalloc(sz, GFP_KERNEL); 1051 if (!iommu->map) { 1052 printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); 1053 return -ENOMEM; 1054 } 1055 iommu_tbl_pool_init(iommu, num_tsb_entries, PAGE_SHIFT, 1056 NULL, false /* no large pool */, 1057 1 /* npools */, 1058 true /* skip span boundary check */); 1059 1060 order = get_order(tsbsize); 1061 1062 table = (struct ldc_mtable_entry *) 1063 __get_free_pages(GFP_KERNEL, order); 1064 err = -ENOMEM; 1065 if (!table) { 1066 printk(KERN_ERR PFX "Alloc of MTE table failed, " 1067 "size=%lu order=%lu\n", tsbsize, order); 1068 goto out_free_map; 1069 } 1070 1071 memset(table, 0, PAGE_SIZE << order); 1072 1073 ldc_iommu->page_table = table; 1074 1075 hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), 1076 num_tsb_entries); 1077 err = -EINVAL; 1078 if (hv_err) 1079 goto out_free_table; 1080 1081 return 0; 1082 1083 out_free_table: 1084 free_pages((unsigned long) table, order); 1085 ldc_iommu->page_table = NULL; 1086 1087 out_free_map: 1088 kfree(iommu->map); 1089 iommu->map = NULL; 1090 1091 return err; 1092 } 1093 1094 static void ldc_iommu_release(struct ldc_channel *lp) 1095 { 1096 struct ldc_iommu *ldc_iommu = &lp->iommu; 1097 struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; 1098 unsigned long num_tsb_entries, tsbsize, order; 1099 1100 (void) sun4v_ldc_set_map_table(lp->id, 0, 0); 1101 1102 num_tsb_entries = iommu->poolsize * iommu->nr_pools; 1103 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); 1104 order = get_order(tsbsize); 1105 1106 free_pages((unsigned long) ldc_iommu->page_table, order); 1107 ldc_iommu->page_table = NULL; 1108 1109 kfree(iommu->map); 1110 iommu->map = NULL; 1111 } 1112 1113 struct ldc_channel *ldc_alloc(unsigned long id, 1114 const struct ldc_channel_config *cfgp, 1115 void *event_arg, 1116 const char *name) 1117 { 1118 struct ldc_channel *lp; 1119 const struct ldc_mode_ops *mops; 1120 unsigned long dummy1, dummy2, hv_err; 1121 u8 mss, *mssbuf; 1122 int err; 1123 1124 err = -ENODEV; 1125 if (!ldom_domaining_enabled) 1126 goto out_err; 1127 1128 err = -EINVAL; 1129 if (!cfgp) 1130 goto out_err; 1131 if (!name) 1132 goto out_err; 1133 1134 switch (cfgp->mode) { 1135 case LDC_MODE_RAW: 1136 mops = &raw_ops; 1137 mss = LDC_PACKET_SIZE; 1138 break; 1139 1140 case LDC_MODE_UNRELIABLE: 1141 mops = &nonraw_ops; 1142 mss = LDC_PACKET_SIZE - 8; 1143 break; 1144 1145 case LDC_MODE_STREAM: 1146 mops = &stream_ops; 1147 mss = LDC_PACKET_SIZE - 8 - 8; 1148 break; 1149 1150 default: 1151 goto out_err; 1152 } 1153 1154 if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) 1155 goto out_err; 1156 1157 hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); 1158 err = -ENODEV; 1159 if (hv_err == HV_ECHANNEL) 1160 goto out_err; 1161 1162 err = -EEXIST; 1163 if (__ldc_channel_exists(id)) 1164 goto out_err; 1165 1166 mssbuf = NULL; 1167 1168 lp = kzalloc(sizeof(*lp), GFP_KERNEL); 1169 err = -ENOMEM; 1170 if (!lp) 1171 goto out_err; 1172 1173 spin_lock_init(&lp->lock); 1174 1175 lp->id = id; 1176 1177 err = ldc_iommu_init(name, lp); 1178 if (err) 1179 goto out_free_ldc; 1180 1181 lp->mops = mops; 1182 lp->mss = mss; 1183 1184 lp->cfg = *cfgp; 1185 if (!lp->cfg.mtu) 1186 lp->cfg.mtu = LDC_DEFAULT_MTU; 1187 1188 if (lp->cfg.mode == LDC_MODE_STREAM) { 1189 mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL); 1190 if (!mssbuf) { 1191 err = -ENOMEM; 1192 goto out_free_iommu; 1193 } 1194 lp->mssbuf = mssbuf; 1195 } 1196 1197 lp->event_arg = event_arg; 1198 1199 /* XXX allow setting via ldc_channel_config to override defaults 1200 * XXX or use some formula based upon mtu 1201 */ 1202 lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; 1203 lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; 1204 1205 err = alloc_queue("TX", lp->tx_num_entries, 1206 &lp->tx_base, &lp->tx_ra); 1207 if (err) 1208 goto out_free_mssbuf; 1209 1210 err = alloc_queue("RX", lp->rx_num_entries, 1211 &lp->rx_base, &lp->rx_ra); 1212 if (err) 1213 goto out_free_txq; 1214 1215 lp->flags |= LDC_FLAG_ALLOCED_QUEUES; 1216 1217 lp->hs_state = LDC_HS_CLOSED; 1218 ldc_set_state(lp, LDC_STATE_INIT); 1219 1220 INIT_HLIST_NODE(&lp->list); 1221 hlist_add_head(&lp->list, &ldc_channel_list); 1222 1223 INIT_HLIST_HEAD(&lp->mh_list); 1224 1225 snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); 1226 snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); 1227 1228 err = request_irq(lp->cfg.rx_irq, ldc_rx, 0, 1229 lp->rx_irq_name, lp); 1230 if (err) 1231 goto out_free_txq; 1232 1233 err = request_irq(lp->cfg.tx_irq, ldc_tx, 0, 1234 lp->tx_irq_name, lp); 1235 if (err) { 1236 free_irq(lp->cfg.rx_irq, lp); 1237 goto out_free_txq; 1238 } 1239 1240 return lp; 1241 1242 out_free_txq: 1243 free_queue(lp->tx_num_entries, lp->tx_base); 1244 1245 out_free_mssbuf: 1246 kfree(mssbuf); 1247 1248 out_free_iommu: 1249 ldc_iommu_release(lp); 1250 1251 out_free_ldc: 1252 kfree(lp); 1253 1254 out_err: 1255 return ERR_PTR(err); 1256 } 1257 EXPORT_SYMBOL(ldc_alloc); 1258 1259 void ldc_unbind(struct ldc_channel *lp) 1260 { 1261 if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { 1262 free_irq(lp->cfg.rx_irq, lp); 1263 free_irq(lp->cfg.tx_irq, lp); 1264 lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; 1265 } 1266 1267 if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { 1268 sun4v_ldc_tx_qconf(lp->id, 0, 0); 1269 sun4v_ldc_rx_qconf(lp->id, 0, 0); 1270 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; 1271 } 1272 if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { 1273 free_queue(lp->tx_num_entries, lp->tx_base); 1274 free_queue(lp->rx_num_entries, lp->rx_base); 1275 lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; 1276 } 1277 1278 ldc_set_state(lp, LDC_STATE_INIT); 1279 } 1280 EXPORT_SYMBOL(ldc_unbind); 1281 1282 void ldc_free(struct ldc_channel *lp) 1283 { 1284 ldc_unbind(lp); 1285 hlist_del(&lp->list); 1286 kfree(lp->mssbuf); 1287 ldc_iommu_release(lp); 1288 1289 kfree(lp); 1290 } 1291 EXPORT_SYMBOL(ldc_free); 1292 1293 /* Bind the channel. This registers the LDC queues with 1294 * the hypervisor and puts the channel into a pseudo-listening 1295 * state. This does not initiate a handshake, ldc_connect() does 1296 * that. 1297 */ 1298 int ldc_bind(struct ldc_channel *lp) 1299 { 1300 unsigned long hv_err, flags; 1301 int err = -EINVAL; 1302 1303 if (lp->state != LDC_STATE_INIT) 1304 return -EINVAL; 1305 1306 spin_lock_irqsave(&lp->lock, flags); 1307 1308 enable_irq(lp->cfg.rx_irq); 1309 enable_irq(lp->cfg.tx_irq); 1310 1311 lp->flags |= LDC_FLAG_REGISTERED_IRQS; 1312 1313 err = -ENODEV; 1314 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); 1315 if (hv_err) 1316 goto out_free_irqs; 1317 1318 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); 1319 if (hv_err) 1320 goto out_free_irqs; 1321 1322 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); 1323 if (hv_err) 1324 goto out_unmap_tx; 1325 1326 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); 1327 if (hv_err) 1328 goto out_unmap_tx; 1329 1330 lp->flags |= LDC_FLAG_REGISTERED_QUEUES; 1331 1332 hv_err = sun4v_ldc_tx_get_state(lp->id, 1333 &lp->tx_head, 1334 &lp->tx_tail, 1335 &lp->chan_state); 1336 err = -EBUSY; 1337 if (hv_err) 1338 goto out_unmap_rx; 1339 1340 lp->tx_acked = lp->tx_head; 1341 1342 lp->hs_state = LDC_HS_OPEN; 1343 ldc_set_state(lp, LDC_STATE_BOUND); 1344 1345 spin_unlock_irqrestore(&lp->lock, flags); 1346 1347 return 0; 1348 1349 out_unmap_rx: 1350 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; 1351 sun4v_ldc_rx_qconf(lp->id, 0, 0); 1352 1353 out_unmap_tx: 1354 sun4v_ldc_tx_qconf(lp->id, 0, 0); 1355 1356 out_free_irqs: 1357 lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; 1358 free_irq(lp->cfg.tx_irq, lp); 1359 free_irq(lp->cfg.rx_irq, lp); 1360 1361 spin_unlock_irqrestore(&lp->lock, flags); 1362 1363 return err; 1364 } 1365 EXPORT_SYMBOL(ldc_bind); 1366 1367 int ldc_connect(struct ldc_channel *lp) 1368 { 1369 unsigned long flags; 1370 int err; 1371 1372 if (lp->cfg.mode == LDC_MODE_RAW) 1373 return -EINVAL; 1374 1375 spin_lock_irqsave(&lp->lock, flags); 1376 1377 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || 1378 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) || 1379 lp->hs_state != LDC_HS_OPEN) 1380 err = ((lp->hs_state > LDC_HS_OPEN) ? 0 : -EINVAL); 1381 else 1382 err = start_handshake(lp); 1383 1384 spin_unlock_irqrestore(&lp->lock, flags); 1385 1386 return err; 1387 } 1388 EXPORT_SYMBOL(ldc_connect); 1389 1390 int ldc_disconnect(struct ldc_channel *lp) 1391 { 1392 unsigned long hv_err, flags; 1393 int err; 1394 1395 if (lp->cfg.mode == LDC_MODE_RAW) 1396 return -EINVAL; 1397 1398 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || 1399 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES)) 1400 return -EINVAL; 1401 1402 spin_lock_irqsave(&lp->lock, flags); 1403 1404 err = -ENODEV; 1405 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); 1406 if (hv_err) 1407 goto out_err; 1408 1409 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); 1410 if (hv_err) 1411 goto out_err; 1412 1413 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); 1414 if (hv_err) 1415 goto out_err; 1416 1417 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); 1418 if (hv_err) 1419 goto out_err; 1420 1421 ldc_set_state(lp, LDC_STATE_BOUND); 1422 lp->hs_state = LDC_HS_OPEN; 1423 lp->flags |= LDC_FLAG_RESET; 1424 1425 spin_unlock_irqrestore(&lp->lock, flags); 1426 1427 return 0; 1428 1429 out_err: 1430 sun4v_ldc_tx_qconf(lp->id, 0, 0); 1431 sun4v_ldc_rx_qconf(lp->id, 0, 0); 1432 free_irq(lp->cfg.tx_irq, lp); 1433 free_irq(lp->cfg.rx_irq, lp); 1434 lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS | 1435 LDC_FLAG_REGISTERED_QUEUES); 1436 ldc_set_state(lp, LDC_STATE_INIT); 1437 1438 spin_unlock_irqrestore(&lp->lock, flags); 1439 1440 return err; 1441 } 1442 EXPORT_SYMBOL(ldc_disconnect); 1443 1444 int ldc_state(struct ldc_channel *lp) 1445 { 1446 return lp->state; 1447 } 1448 EXPORT_SYMBOL(ldc_state); 1449 1450 static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) 1451 { 1452 struct ldc_packet *p; 1453 unsigned long new_tail; 1454 int err; 1455 1456 if (size > LDC_PACKET_SIZE) 1457 return -EMSGSIZE; 1458 1459 p = data_get_tx_packet(lp, &new_tail); 1460 if (!p) 1461 return -EAGAIN; 1462 1463 memcpy(p, buf, size); 1464 1465 err = send_tx_packet(lp, p, new_tail); 1466 if (!err) 1467 err = size; 1468 1469 return err; 1470 } 1471 1472 static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size) 1473 { 1474 struct ldc_packet *p; 1475 unsigned long hv_err, new; 1476 int err; 1477 1478 if (size < LDC_PACKET_SIZE) 1479 return -EINVAL; 1480 1481 hv_err = sun4v_ldc_rx_get_state(lp->id, 1482 &lp->rx_head, 1483 &lp->rx_tail, 1484 &lp->chan_state); 1485 if (hv_err) 1486 return ldc_abort(lp); 1487 1488 if (lp->chan_state == LDC_CHANNEL_DOWN || 1489 lp->chan_state == LDC_CHANNEL_RESETTING) 1490 return -ECONNRESET; 1491 1492 if (lp->rx_head == lp->rx_tail) 1493 return 0; 1494 1495 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); 1496 memcpy(buf, p, LDC_PACKET_SIZE); 1497 1498 new = rx_advance(lp, lp->rx_head); 1499 lp->rx_head = new; 1500 1501 err = __set_rx_head(lp, new); 1502 if (err < 0) 1503 err = -ECONNRESET; 1504 else 1505 err = LDC_PACKET_SIZE; 1506 1507 return err; 1508 } 1509 1510 static const struct ldc_mode_ops raw_ops = { 1511 .write = write_raw, 1512 .read = read_raw, 1513 }; 1514 1515 static int write_nonraw(struct ldc_channel *lp, const void *buf, 1516 unsigned int size) 1517 { 1518 unsigned long hv_err, tail; 1519 unsigned int copied; 1520 u32 seq; 1521 int err; 1522 1523 hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, 1524 &lp->chan_state); 1525 if (unlikely(hv_err)) 1526 return -EBUSY; 1527 1528 if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) 1529 return ldc_abort(lp); 1530 1531 if (!tx_has_space_for(lp, size)) 1532 return -EAGAIN; 1533 1534 seq = lp->snd_nxt; 1535 copied = 0; 1536 tail = lp->tx_tail; 1537 while (copied < size) { 1538 struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE); 1539 u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ? 1540 p->u.u_data : 1541 p->u.r.r_data); 1542 int data_len; 1543 1544 p->type = LDC_DATA; 1545 p->stype = LDC_INFO; 1546 p->ctrl = 0; 1547 1548 data_len = size - copied; 1549 if (data_len > lp->mss) 1550 data_len = lp->mss; 1551 1552 BUG_ON(data_len > LDC_LEN); 1553 1554 p->env = (data_len | 1555 (copied == 0 ? LDC_START : 0) | 1556 (data_len == size - copied ? LDC_STOP : 0)); 1557 1558 p->seqid = ++seq; 1559 1560 ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n", 1561 p->type, 1562 p->stype, 1563 p->ctrl, 1564 p->env, 1565 p->seqid); 1566 1567 memcpy(data, buf, data_len); 1568 buf += data_len; 1569 copied += data_len; 1570 1571 tail = tx_advance(lp, tail); 1572 } 1573 1574 err = set_tx_tail(lp, tail); 1575 if (!err) { 1576 lp->snd_nxt = seq; 1577 err = size; 1578 } 1579 1580 return err; 1581 } 1582 1583 static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p, 1584 struct ldc_packet *first_frag) 1585 { 1586 int err; 1587 1588 if (first_frag) 1589 lp->rcv_nxt = first_frag->seqid - 1; 1590 1591 err = send_data_nack(lp, p); 1592 if (err) 1593 return err; 1594 1595 err = __set_rx_head(lp, lp->rx_tail); 1596 if (err < 0) 1597 return ldc_abort(lp); 1598 1599 return 0; 1600 } 1601 1602 static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p) 1603 { 1604 if (p->stype & LDC_ACK) { 1605 int err = process_data_ack(lp, p); 1606 if (err) 1607 return err; 1608 } 1609 if (p->stype & LDC_NACK) 1610 return ldc_abort(lp); 1611 1612 return 0; 1613 } 1614 1615 static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head) 1616 { 1617 unsigned long dummy; 1618 int limit = 1000; 1619 1620 ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n", 1621 cur_head, lp->rx_head, lp->rx_tail); 1622 while (limit-- > 0) { 1623 unsigned long hv_err; 1624 1625 hv_err = sun4v_ldc_rx_get_state(lp->id, 1626 &dummy, 1627 &lp->rx_tail, 1628 &lp->chan_state); 1629 if (hv_err) 1630 return ldc_abort(lp); 1631 1632 if (lp->chan_state == LDC_CHANNEL_DOWN || 1633 lp->chan_state == LDC_CHANNEL_RESETTING) 1634 return -ECONNRESET; 1635 1636 if (cur_head != lp->rx_tail) { 1637 ldcdbg(DATA, "DATA WAIT DONE " 1638 "head[%lx] tail[%lx] chan_state[%lx]\n", 1639 dummy, lp->rx_tail, lp->chan_state); 1640 return 0; 1641 } 1642 1643 udelay(1); 1644 } 1645 return -EAGAIN; 1646 } 1647 1648 static int rx_set_head(struct ldc_channel *lp, unsigned long head) 1649 { 1650 int err = __set_rx_head(lp, head); 1651 1652 if (err < 0) 1653 return ldc_abort(lp); 1654 1655 lp->rx_head = head; 1656 return 0; 1657 } 1658 1659 static void send_data_ack(struct ldc_channel *lp) 1660 { 1661 unsigned long new_tail; 1662 struct ldc_packet *p; 1663 1664 p = data_get_tx_packet(lp, &new_tail); 1665 if (likely(p)) { 1666 int err; 1667 1668 memset(p, 0, sizeof(*p)); 1669 p->type = LDC_DATA; 1670 p->stype = LDC_ACK; 1671 p->ctrl = 0; 1672 p->seqid = lp->snd_nxt + 1; 1673 p->u.r.ackid = lp->rcv_nxt; 1674 1675 err = send_tx_packet(lp, p, new_tail); 1676 if (!err) 1677 lp->snd_nxt++; 1678 } 1679 } 1680 1681 static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size) 1682 { 1683 struct ldc_packet *first_frag; 1684 unsigned long hv_err, new; 1685 int err, copied; 1686 1687 hv_err = sun4v_ldc_rx_get_state(lp->id, 1688 &lp->rx_head, 1689 &lp->rx_tail, 1690 &lp->chan_state); 1691 if (hv_err) 1692 return ldc_abort(lp); 1693 1694 if (lp->chan_state == LDC_CHANNEL_DOWN || 1695 lp->chan_state == LDC_CHANNEL_RESETTING) 1696 return -ECONNRESET; 1697 1698 if (lp->rx_head == lp->rx_tail) 1699 return 0; 1700 1701 first_frag = NULL; 1702 copied = err = 0; 1703 new = lp->rx_head; 1704 while (1) { 1705 struct ldc_packet *p; 1706 int pkt_len; 1707 1708 BUG_ON(new == lp->rx_tail); 1709 p = lp->rx_base + (new / LDC_PACKET_SIZE); 1710 1711 ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " 1712 "rcv_nxt[%08x]\n", 1713 p->type, 1714 p->stype, 1715 p->ctrl, 1716 p->env, 1717 p->seqid, 1718 p->u.r.ackid, 1719 lp->rcv_nxt); 1720 1721 if (unlikely(!rx_seq_ok(lp, p->seqid))) { 1722 err = rx_bad_seq(lp, p, first_frag); 1723 copied = 0; 1724 break; 1725 } 1726 1727 if (p->type & LDC_CTRL) { 1728 err = process_control_frame(lp, p); 1729 if (err < 0) 1730 break; 1731 err = 0; 1732 } 1733 1734 lp->rcv_nxt = p->seqid; 1735 1736 if (!(p->type & LDC_DATA)) { 1737 new = rx_advance(lp, new); 1738 goto no_data; 1739 } 1740 if (p->stype & (LDC_ACK | LDC_NACK)) { 1741 err = data_ack_nack(lp, p); 1742 if (err) 1743 break; 1744 } 1745 if (!(p->stype & LDC_INFO)) { 1746 new = rx_advance(lp, new); 1747 err = rx_set_head(lp, new); 1748 if (err) 1749 break; 1750 goto no_data; 1751 } 1752 1753 pkt_len = p->env & LDC_LEN; 1754 1755 /* Every initial packet starts with the START bit set. 1756 * 1757 * Singleton packets will have both START+STOP set. 1758 * 1759 * Fragments will have START set in the first frame, STOP 1760 * set in the last frame, and neither bit set in middle 1761 * frames of the packet. 1762 * 1763 * Therefore if we are at the beginning of a packet and 1764 * we don't see START, or we are in the middle of a fragmented 1765 * packet and do see START, we are unsynchronized and should 1766 * flush the RX queue. 1767 */ 1768 if ((first_frag == NULL && !(p->env & LDC_START)) || 1769 (first_frag != NULL && (p->env & LDC_START))) { 1770 if (!first_frag) 1771 new = rx_advance(lp, new); 1772 1773 err = rx_set_head(lp, new); 1774 if (err) 1775 break; 1776 1777 if (!first_frag) 1778 goto no_data; 1779 } 1780 if (!first_frag) 1781 first_frag = p; 1782 1783 if (pkt_len > size - copied) { 1784 /* User didn't give us a big enough buffer, 1785 * what to do? This is a pretty serious error. 1786 * 1787 * Since we haven't updated the RX ring head to 1788 * consume any of the packets, signal the error 1789 * to the user and just leave the RX ring alone. 1790 * 1791 * This seems the best behavior because this allows 1792 * a user of the LDC layer to start with a small 1793 * RX buffer for ldc_read() calls and use -EMSGSIZE 1794 * as a cue to enlarge it's read buffer. 1795 */ 1796 err = -EMSGSIZE; 1797 break; 1798 } 1799 1800 /* Ok, we are gonna eat this one. */ 1801 new = rx_advance(lp, new); 1802 1803 memcpy(buf, 1804 (lp->cfg.mode == LDC_MODE_UNRELIABLE ? 1805 p->u.u_data : p->u.r.r_data), pkt_len); 1806 buf += pkt_len; 1807 copied += pkt_len; 1808 1809 if (p->env & LDC_STOP) 1810 break; 1811 1812 no_data: 1813 if (new == lp->rx_tail) { 1814 err = rx_data_wait(lp, new); 1815 if (err) 1816 break; 1817 } 1818 } 1819 1820 if (!err) 1821 err = rx_set_head(lp, new); 1822 1823 if (err && first_frag) 1824 lp->rcv_nxt = first_frag->seqid - 1; 1825 1826 if (!err) { 1827 err = copied; 1828 if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) 1829 send_data_ack(lp); 1830 } 1831 1832 return err; 1833 } 1834 1835 static const struct ldc_mode_ops nonraw_ops = { 1836 .write = write_nonraw, 1837 .read = read_nonraw, 1838 }; 1839 1840 static int write_stream(struct ldc_channel *lp, const void *buf, 1841 unsigned int size) 1842 { 1843 if (size > lp->cfg.mtu) 1844 size = lp->cfg.mtu; 1845 return write_nonraw(lp, buf, size); 1846 } 1847 1848 static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size) 1849 { 1850 if (!lp->mssbuf_len) { 1851 int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); 1852 if (err < 0) 1853 return err; 1854 1855 lp->mssbuf_len = err; 1856 lp->mssbuf_off = 0; 1857 } 1858 1859 if (size > lp->mssbuf_len) 1860 size = lp->mssbuf_len; 1861 memcpy(buf, lp->mssbuf + lp->mssbuf_off, size); 1862 1863 lp->mssbuf_off += size; 1864 lp->mssbuf_len -= size; 1865 1866 return size; 1867 } 1868 1869 static const struct ldc_mode_ops stream_ops = { 1870 .write = write_stream, 1871 .read = read_stream, 1872 }; 1873 1874 int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size) 1875 { 1876 unsigned long flags; 1877 int err; 1878 1879 if (!buf) 1880 return -EINVAL; 1881 1882 if (!size) 1883 return 0; 1884 1885 spin_lock_irqsave(&lp->lock, flags); 1886 1887 if (lp->hs_state != LDC_HS_COMPLETE) 1888 err = -ENOTCONN; 1889 else 1890 err = lp->mops->write(lp, buf, size); 1891 1892 spin_unlock_irqrestore(&lp->lock, flags); 1893 1894 return err; 1895 } 1896 EXPORT_SYMBOL(ldc_write); 1897 1898 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size) 1899 { 1900 unsigned long flags; 1901 int err; 1902 1903 if (!buf) 1904 return -EINVAL; 1905 1906 if (!size) 1907 return 0; 1908 1909 spin_lock_irqsave(&lp->lock, flags); 1910 1911 if (lp->hs_state != LDC_HS_COMPLETE) 1912 err = -ENOTCONN; 1913 else 1914 err = lp->mops->read(lp, buf, size); 1915 1916 spin_unlock_irqrestore(&lp->lock, flags); 1917 1918 return err; 1919 } 1920 EXPORT_SYMBOL(ldc_read); 1921 1922 static u64 pagesize_code(void) 1923 { 1924 switch (PAGE_SIZE) { 1925 default: 1926 case (8ULL * 1024ULL): 1927 return 0; 1928 case (64ULL * 1024ULL): 1929 return 1; 1930 case (512ULL * 1024ULL): 1931 return 2; 1932 case (4ULL * 1024ULL * 1024ULL): 1933 return 3; 1934 case (32ULL * 1024ULL * 1024ULL): 1935 return 4; 1936 case (256ULL * 1024ULL * 1024ULL): 1937 return 5; 1938 } 1939 } 1940 1941 static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) 1942 { 1943 return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | 1944 (index << PAGE_SHIFT) | 1945 page_offset); 1946 } 1947 1948 1949 static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, 1950 unsigned long npages) 1951 { 1952 long entry; 1953 1954 entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table, 1955 npages, NULL, (unsigned long)-1, 0); 1956 if (unlikely(entry < 0)) 1957 return NULL; 1958 1959 return iommu->page_table + entry; 1960 } 1961 1962 static u64 perm_to_mte(unsigned int map_perm) 1963 { 1964 u64 mte_base; 1965 1966 mte_base = pagesize_code(); 1967 1968 if (map_perm & LDC_MAP_SHADOW) { 1969 if (map_perm & LDC_MAP_R) 1970 mte_base |= LDC_MTE_COPY_R; 1971 if (map_perm & LDC_MAP_W) 1972 mte_base |= LDC_MTE_COPY_W; 1973 } 1974 if (map_perm & LDC_MAP_DIRECT) { 1975 if (map_perm & LDC_MAP_R) 1976 mte_base |= LDC_MTE_READ; 1977 if (map_perm & LDC_MAP_W) 1978 mte_base |= LDC_MTE_WRITE; 1979 if (map_perm & LDC_MAP_X) 1980 mte_base |= LDC_MTE_EXEC; 1981 } 1982 if (map_perm & LDC_MAP_IO) { 1983 if (map_perm & LDC_MAP_R) 1984 mte_base |= LDC_MTE_IOMMU_R; 1985 if (map_perm & LDC_MAP_W) 1986 mte_base |= LDC_MTE_IOMMU_W; 1987 } 1988 1989 return mte_base; 1990 } 1991 1992 static int pages_in_region(unsigned long base, long len) 1993 { 1994 int count = 0; 1995 1996 do { 1997 unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; 1998 1999 len -= (new - base); 2000 base = new; 2001 count++; 2002 } while (len > 0); 2003 2004 return count; 2005 } 2006 2007 struct cookie_state { 2008 struct ldc_mtable_entry *page_table; 2009 struct ldc_trans_cookie *cookies; 2010 u64 mte_base; 2011 u64 prev_cookie; 2012 u32 pte_idx; 2013 u32 nc; 2014 }; 2015 2016 static void fill_cookies(struct cookie_state *sp, unsigned long pa, 2017 unsigned long off, unsigned long len) 2018 { 2019 do { 2020 unsigned long tlen, new = pa + PAGE_SIZE; 2021 u64 this_cookie; 2022 2023 sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; 2024 2025 tlen = PAGE_SIZE; 2026 if (off) 2027 tlen = PAGE_SIZE - off; 2028 if (tlen > len) 2029 tlen = len; 2030 2031 this_cookie = make_cookie(sp->pte_idx, 2032 pagesize_code(), off); 2033 2034 off = 0; 2035 2036 if (this_cookie == sp->prev_cookie) { 2037 sp->cookies[sp->nc - 1].cookie_size += tlen; 2038 } else { 2039 sp->cookies[sp->nc].cookie_addr = this_cookie; 2040 sp->cookies[sp->nc].cookie_size = tlen; 2041 sp->nc++; 2042 } 2043 sp->prev_cookie = this_cookie + tlen; 2044 2045 sp->pte_idx++; 2046 2047 len -= tlen; 2048 pa = new; 2049 } while (len > 0); 2050 } 2051 2052 static int sg_count_one(struct scatterlist *sg) 2053 { 2054 unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; 2055 long len = sg->length; 2056 2057 if ((sg->offset | len) & (8UL - 1)) 2058 return -EFAULT; 2059 2060 return pages_in_region(base + sg->offset, len); 2061 } 2062 2063 static int sg_count_pages(struct scatterlist *sg, int num_sg) 2064 { 2065 int count; 2066 int i; 2067 2068 count = 0; 2069 for (i = 0; i < num_sg; i++) { 2070 int err = sg_count_one(sg + i); 2071 if (err < 0) 2072 return err; 2073 count += err; 2074 } 2075 2076 return count; 2077 } 2078 2079 int ldc_map_sg(struct ldc_channel *lp, 2080 struct scatterlist *sg, int num_sg, 2081 struct ldc_trans_cookie *cookies, int ncookies, 2082 unsigned int map_perm) 2083 { 2084 unsigned long i, npages; 2085 struct ldc_mtable_entry *base; 2086 struct cookie_state state; 2087 struct ldc_iommu *iommu; 2088 int err; 2089 2090 if (map_perm & ~LDC_MAP_ALL) 2091 return -EINVAL; 2092 2093 err = sg_count_pages(sg, num_sg); 2094 if (err < 0) 2095 return err; 2096 2097 npages = err; 2098 if (err > ncookies) 2099 return -EMSGSIZE; 2100 2101 iommu = &lp->iommu; 2102 2103 base = alloc_npages(iommu, npages); 2104 2105 if (!base) 2106 return -ENOMEM; 2107 2108 state.page_table = iommu->page_table; 2109 state.cookies = cookies; 2110 state.mte_base = perm_to_mte(map_perm); 2111 state.prev_cookie = ~(u64)0; 2112 state.pte_idx = (base - iommu->page_table); 2113 state.nc = 0; 2114 2115 for (i = 0; i < num_sg; i++) 2116 fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT, 2117 sg[i].offset, sg[i].length); 2118 2119 return state.nc; 2120 } 2121 EXPORT_SYMBOL(ldc_map_sg); 2122 2123 int ldc_map_single(struct ldc_channel *lp, 2124 void *buf, unsigned int len, 2125 struct ldc_trans_cookie *cookies, int ncookies, 2126 unsigned int map_perm) 2127 { 2128 unsigned long npages, pa; 2129 struct ldc_mtable_entry *base; 2130 struct cookie_state state; 2131 struct ldc_iommu *iommu; 2132 2133 if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) 2134 return -EINVAL; 2135 2136 pa = __pa(buf); 2137 if ((pa | len) & (8UL - 1)) 2138 return -EFAULT; 2139 2140 npages = pages_in_region(pa, len); 2141 2142 iommu = &lp->iommu; 2143 2144 base = alloc_npages(iommu, npages); 2145 2146 if (!base) 2147 return -ENOMEM; 2148 2149 state.page_table = iommu->page_table; 2150 state.cookies = cookies; 2151 state.mte_base = perm_to_mte(map_perm); 2152 state.prev_cookie = ~(u64)0; 2153 state.pte_idx = (base - iommu->page_table); 2154 state.nc = 0; 2155 fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); 2156 BUG_ON(state.nc > ncookies); 2157 2158 return state.nc; 2159 } 2160 EXPORT_SYMBOL(ldc_map_single); 2161 2162 2163 static void free_npages(unsigned long id, struct ldc_iommu *iommu, 2164 u64 cookie, u64 size) 2165 { 2166 unsigned long npages, entry; 2167 2168 npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; 2169 2170 entry = ldc_cookie_to_index(cookie, iommu); 2171 ldc_demap(iommu, id, cookie, entry, npages); 2172 iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry); 2173 } 2174 2175 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, 2176 int ncookies) 2177 { 2178 struct ldc_iommu *iommu = &lp->iommu; 2179 int i; 2180 unsigned long flags; 2181 2182 spin_lock_irqsave(&iommu->lock, flags); 2183 for (i = 0; i < ncookies; i++) { 2184 u64 addr = cookies[i].cookie_addr; 2185 u64 size = cookies[i].cookie_size; 2186 2187 free_npages(lp->id, iommu, addr, size); 2188 } 2189 spin_unlock_irqrestore(&iommu->lock, flags); 2190 } 2191 EXPORT_SYMBOL(ldc_unmap); 2192 2193 int ldc_copy(struct ldc_channel *lp, int copy_dir, 2194 void *buf, unsigned int len, unsigned long offset, 2195 struct ldc_trans_cookie *cookies, int ncookies) 2196 { 2197 unsigned int orig_len; 2198 unsigned long ra; 2199 int i; 2200 2201 if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { 2202 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n", 2203 lp->id, copy_dir); 2204 return -EINVAL; 2205 } 2206 2207 ra = __pa(buf); 2208 if ((ra | len | offset) & (8UL - 1)) { 2209 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " 2210 "ra[%lx] len[%x] offset[%lx]\n", 2211 lp->id, ra, len, offset); 2212 return -EFAULT; 2213 } 2214 2215 if (lp->hs_state != LDC_HS_COMPLETE || 2216 (lp->flags & LDC_FLAG_RESET)) { 2217 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " 2218 "flags[%x]\n", lp->id, lp->hs_state, lp->flags); 2219 return -ECONNRESET; 2220 } 2221 2222 orig_len = len; 2223 for (i = 0; i < ncookies; i++) { 2224 unsigned long cookie_raddr = cookies[i].cookie_addr; 2225 unsigned long this_len = cookies[i].cookie_size; 2226 unsigned long actual_len; 2227 2228 if (unlikely(offset)) { 2229 unsigned long this_off = offset; 2230 2231 if (this_off > this_len) 2232 this_off = this_len; 2233 2234 offset -= this_off; 2235 this_len -= this_off; 2236 if (!this_len) 2237 continue; 2238 cookie_raddr += this_off; 2239 } 2240 2241 if (this_len > len) 2242 this_len = len; 2243 2244 while (1) { 2245 unsigned long hv_err; 2246 2247 hv_err = sun4v_ldc_copy(lp->id, copy_dir, 2248 cookie_raddr, ra, 2249 this_len, &actual_len); 2250 if (unlikely(hv_err)) { 2251 printk(KERN_ERR PFX "ldc_copy: ID[%lu] " 2252 "HV error %lu\n", 2253 lp->id, hv_err); 2254 if (lp->hs_state != LDC_HS_COMPLETE || 2255 (lp->flags & LDC_FLAG_RESET)) 2256 return -ECONNRESET; 2257 else 2258 return -EFAULT; 2259 } 2260 2261 cookie_raddr += actual_len; 2262 ra += actual_len; 2263 len -= actual_len; 2264 if (actual_len == this_len) 2265 break; 2266 2267 this_len -= actual_len; 2268 } 2269 2270 if (!len) 2271 break; 2272 } 2273 2274 /* It is caller policy what to do about short copies. 2275 * For example, a networking driver can declare the 2276 * packet a runt and drop it. 2277 */ 2278 2279 return orig_len - len; 2280 } 2281 EXPORT_SYMBOL(ldc_copy); 2282 2283 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, 2284 struct ldc_trans_cookie *cookies, int *ncookies, 2285 unsigned int map_perm) 2286 { 2287 void *buf; 2288 int err; 2289 2290 if (len & (8UL - 1)) 2291 return ERR_PTR(-EINVAL); 2292 2293 buf = kzalloc(len, GFP_KERNEL); 2294 if (!buf) 2295 return ERR_PTR(-ENOMEM); 2296 2297 err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); 2298 if (err < 0) { 2299 kfree(buf); 2300 return ERR_PTR(err); 2301 } 2302 *ncookies = err; 2303 2304 return buf; 2305 } 2306 EXPORT_SYMBOL(ldc_alloc_exp_dring); 2307 2308 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, 2309 struct ldc_trans_cookie *cookies, int ncookies) 2310 { 2311 ldc_unmap(lp, cookies, ncookies); 2312 kfree(buf); 2313 } 2314 EXPORT_SYMBOL(ldc_free_exp_dring); 2315 2316 static int __init ldc_init(void) 2317 { 2318 unsigned long major, minor; 2319 struct mdesc_handle *hp; 2320 const u64 *v; 2321 int err; 2322 u64 mp; 2323 2324 hp = mdesc_grab(); 2325 if (!hp) 2326 return -ENODEV; 2327 2328 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); 2329 err = -ENODEV; 2330 if (mp == MDESC_NODE_NULL) 2331 goto out; 2332 2333 v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); 2334 if (!v) 2335 goto out; 2336 2337 major = 1; 2338 minor = 0; 2339 if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { 2340 printk(KERN_INFO PFX "Could not register LDOM hvapi.\n"); 2341 goto out; 2342 } 2343 2344 printk(KERN_INFO "%s", version); 2345 2346 if (!*v) { 2347 printk(KERN_INFO PFX "Domaining disabled.\n"); 2348 goto out; 2349 } 2350 ldom_domaining_enabled = 1; 2351 err = 0; 2352 2353 out: 2354 mdesc_release(hp); 2355 return err; 2356 } 2357 2358 core_initcall(ldc_init); 2359