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/module.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 19 #include <asm/hypervisor.h> 20 #include <asm/iommu.h> 21 #include <asm/page.h> 22 #include <asm/ldc.h> 23 #include <asm/mdesc.h> 24 25 #define DRV_MODULE_NAME "ldc" 26 #define PFX DRV_MODULE_NAME ": " 27 #define DRV_MODULE_VERSION "1.1" 28 #define DRV_MODULE_RELDATE "July 22, 2008" 29 30 static char version[] __devinitdata = 31 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; 32 #define LDC_PACKET_SIZE 64 33 34 /* Packet header layout for unreliable and reliable mode frames. 35 * When in RAW mode, packets are simply straight 64-byte payloads 36 * with no headers. 37 */ 38 struct ldc_packet { 39 u8 type; 40 #define LDC_CTRL 0x01 41 #define LDC_DATA 0x02 42 #define LDC_ERR 0x10 43 44 u8 stype; 45 #define LDC_INFO 0x01 46 #define LDC_ACK 0x02 47 #define LDC_NACK 0x04 48 49 u8 ctrl; 50 #define LDC_VERS 0x01 /* Link Version */ 51 #define LDC_RTS 0x02 /* Request To Send */ 52 #define LDC_RTR 0x03 /* Ready To Receive */ 53 #define LDC_RDX 0x04 /* Ready for Data eXchange */ 54 #define LDC_CTRL_MSK 0x0f 55 56 u8 env; 57 #define LDC_LEN 0x3f 58 #define LDC_FRAG_MASK 0xc0 59 #define LDC_START 0x40 60 #define LDC_STOP 0x80 61 62 u32 seqid; 63 64 union { 65 u8 u_data[LDC_PACKET_SIZE - 8]; 66 struct { 67 u32 pad; 68 u32 ackid; 69 u8 r_data[LDC_PACKET_SIZE - 8 - 8]; 70 } r; 71 } u; 72 }; 73 74 struct ldc_version { 75 u16 major; 76 u16 minor; 77 }; 78 79 /* Ordered from largest major to lowest. */ 80 static struct ldc_version ver_arr[] = { 81 { .major = 1, .minor = 0 }, 82 }; 83 84 #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE) 85 #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE) 86 87 struct ldc_channel; 88 89 struct ldc_mode_ops { 90 int (*write)(struct ldc_channel *, const void *, unsigned int); 91 int (*read)(struct ldc_channel *, void *, unsigned int); 92 }; 93 94 static const struct ldc_mode_ops raw_ops; 95 static const struct ldc_mode_ops nonraw_ops; 96 static const struct ldc_mode_ops stream_ops; 97 98 int ldom_domaining_enabled; 99 100 struct ldc_iommu { 101 /* Protects arena alloc/free. */ 102 spinlock_t lock; 103 struct iommu_arena arena; 104 struct ldc_mtable_entry *page_table; 105 }; 106 107 struct ldc_channel { 108 /* Protects all operations that depend upon channel state. */ 109 spinlock_t lock; 110 111 unsigned long id; 112 113 u8 *mssbuf; 114 u32 mssbuf_len; 115 u32 mssbuf_off; 116 117 struct ldc_packet *tx_base; 118 unsigned long tx_head; 119 unsigned long tx_tail; 120 unsigned long tx_num_entries; 121 unsigned long tx_ra; 122 123 unsigned long tx_acked; 124 125 struct ldc_packet *rx_base; 126 unsigned long rx_head; 127 unsigned long rx_tail; 128 unsigned long rx_num_entries; 129 unsigned long rx_ra; 130 131 u32 rcv_nxt; 132 u32 snd_nxt; 133 134 unsigned long chan_state; 135 136 struct ldc_channel_config cfg; 137 void *event_arg; 138 139 const struct ldc_mode_ops *mops; 140 141 struct ldc_iommu iommu; 142 143 struct ldc_version ver; 144 145 u8 hs_state; 146 #define LDC_HS_CLOSED 0x00 147 #define LDC_HS_OPEN 0x01 148 #define LDC_HS_GOTVERS 0x02 149 #define LDC_HS_SENTRTR 0x03 150 #define LDC_HS_GOTRTR 0x04 151 #define LDC_HS_COMPLETE 0x10 152 153 u8 flags; 154 #define LDC_FLAG_ALLOCED_QUEUES 0x01 155 #define LDC_FLAG_REGISTERED_QUEUES 0x02 156 #define LDC_FLAG_REGISTERED_IRQS 0x04 157 #define LDC_FLAG_RESET 0x10 158 159 u8 mss; 160 u8 state; 161 162 #define LDC_IRQ_NAME_MAX 32 163 char rx_irq_name[LDC_IRQ_NAME_MAX]; 164 char tx_irq_name[LDC_IRQ_NAME_MAX]; 165 166 struct hlist_head mh_list; 167 168 struct hlist_node list; 169 }; 170 171 #define ldcdbg(TYPE, f, a...) \ 172 do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \ 173 printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \ 174 } while (0) 175 176 static const char *state_to_str(u8 state) 177 { 178 switch (state) { 179 case LDC_STATE_INVALID: 180 return "INVALID"; 181 case LDC_STATE_INIT: 182 return "INIT"; 183 case LDC_STATE_BOUND: 184 return "BOUND"; 185 case LDC_STATE_READY: 186 return "READY"; 187 case LDC_STATE_CONNECTED: 188 return "CONNECTED"; 189 default: 190 return "<UNKNOWN>"; 191 } 192 } 193 194 static void ldc_set_state(struct ldc_channel *lp, u8 state) 195 { 196 ldcdbg(STATE, "STATE (%s) --> (%s)\n", 197 state_to_str(lp->state), 198 state_to_str(state)); 199 200 lp->state = state; 201 } 202 203 static unsigned long __advance(unsigned long off, unsigned long num_entries) 204 { 205 off += LDC_PACKET_SIZE; 206 if (off == (num_entries * LDC_PACKET_SIZE)) 207 off = 0; 208 209 return off; 210 } 211 212 static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off) 213 { 214 return __advance(off, lp->rx_num_entries); 215 } 216 217 static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off) 218 { 219 return __advance(off, lp->tx_num_entries); 220 } 221 222 static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp, 223 unsigned long *new_tail) 224 { 225 struct ldc_packet *p; 226 unsigned long t; 227 228 t = tx_advance(lp, lp->tx_tail); 229 if (t == lp->tx_head) 230 return NULL; 231 232 *new_tail = t; 233 234 p = lp->tx_base; 235 return p + (lp->tx_tail / LDC_PACKET_SIZE); 236 } 237 238 /* When we are in reliable or stream mode, have to track the next packet 239 * we haven't gotten an ACK for in the TX queue using tx_acked. We have 240 * to be careful not to stomp over the queue past that point. During 241 * the handshake, we don't have TX data packets pending in the queue 242 * and that's why handshake_get_tx_packet() need not be mindful of 243 * lp->tx_acked. 244 */ 245 static unsigned long head_for_data(struct ldc_channel *lp) 246 { 247 if (lp->cfg.mode == LDC_MODE_STREAM) 248 return lp->tx_acked; 249 return lp->tx_head; 250 } 251 252 static int tx_has_space_for(struct ldc_channel *lp, unsigned int size) 253 { 254 unsigned long limit, tail, new_tail, diff; 255 unsigned int mss; 256 257 limit = head_for_data(lp); 258 tail = lp->tx_tail; 259 new_tail = tx_advance(lp, tail); 260 if (new_tail == limit) 261 return 0; 262 263 if (limit > new_tail) 264 diff = limit - new_tail; 265 else 266 diff = (limit + 267 ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail)); 268 diff /= LDC_PACKET_SIZE; 269 mss = lp->mss; 270 271 if (diff * mss < size) 272 return 0; 273 274 return 1; 275 } 276 277 static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp, 278 unsigned long *new_tail) 279 { 280 struct ldc_packet *p; 281 unsigned long h, t; 282 283 h = head_for_data(lp); 284 t = tx_advance(lp, lp->tx_tail); 285 if (t == h) 286 return NULL; 287 288 *new_tail = t; 289 290 p = lp->tx_base; 291 return p + (lp->tx_tail / LDC_PACKET_SIZE); 292 } 293 294 static int set_tx_tail(struct ldc_channel *lp, unsigned long tail) 295 { 296 unsigned long orig_tail = lp->tx_tail; 297 int limit = 1000; 298 299 lp->tx_tail = tail; 300 while (limit-- > 0) { 301 unsigned long err; 302 303 err = sun4v_ldc_tx_set_qtail(lp->id, tail); 304 if (!err) 305 return 0; 306 307 if (err != HV_EWOULDBLOCK) { 308 lp->tx_tail = orig_tail; 309 return -EINVAL; 310 } 311 udelay(1); 312 } 313 314 lp->tx_tail = orig_tail; 315 return -EBUSY; 316 } 317 318 /* This just updates the head value in the hypervisor using 319 * a polling loop with a timeout. The caller takes care of 320 * upating software state representing the head change, if any. 321 */ 322 static int __set_rx_head(struct ldc_channel *lp, unsigned long head) 323 { 324 int limit = 1000; 325 326 while (limit-- > 0) { 327 unsigned long err; 328 329 err = sun4v_ldc_rx_set_qhead(lp->id, head); 330 if (!err) 331 return 0; 332 333 if (err != HV_EWOULDBLOCK) 334 return -EINVAL; 335 336 udelay(1); 337 } 338 339 return -EBUSY; 340 } 341 342 static int send_tx_packet(struct ldc_channel *lp, 343 struct ldc_packet *p, 344 unsigned long new_tail) 345 { 346 BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE))); 347 348 return set_tx_tail(lp, new_tail); 349 } 350 351 static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp, 352 u8 stype, u8 ctrl, 353 void *data, int dlen, 354 unsigned long *new_tail) 355 { 356 struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail); 357 358 if (p) { 359 memset(p, 0, sizeof(*p)); 360 p->type = LDC_CTRL; 361 p->stype = stype; 362 p->ctrl = ctrl; 363 if (data) 364 memcpy(p->u.u_data, data, dlen); 365 } 366 return p; 367 } 368 369 static int start_handshake(struct ldc_channel *lp) 370 { 371 struct ldc_packet *p; 372 struct ldc_version *ver; 373 unsigned long new_tail; 374 375 ver = &ver_arr[0]; 376 377 ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n", 378 ver->major, ver->minor); 379 380 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, 381 ver, sizeof(*ver), &new_tail); 382 if (p) { 383 int err = send_tx_packet(lp, p, new_tail); 384 if (!err) 385 lp->flags &= ~LDC_FLAG_RESET; 386 return err; 387 } 388 return -EBUSY; 389 } 390 391 static int send_version_nack(struct ldc_channel *lp, 392 u16 major, u16 minor) 393 { 394 struct ldc_packet *p; 395 struct ldc_version ver; 396 unsigned long new_tail; 397 398 ver.major = major; 399 ver.minor = minor; 400 401 p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS, 402 &ver, sizeof(ver), &new_tail); 403 if (p) { 404 ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n", 405 ver.major, ver.minor); 406 407 return send_tx_packet(lp, p, new_tail); 408 } 409 return -EBUSY; 410 } 411 412 static int send_version_ack(struct ldc_channel *lp, 413 struct ldc_version *vp) 414 { 415 struct ldc_packet *p; 416 unsigned long new_tail; 417 418 p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS, 419 vp, sizeof(*vp), &new_tail); 420 if (p) { 421 ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n", 422 vp->major, vp->minor); 423 424 return send_tx_packet(lp, p, new_tail); 425 } 426 return -EBUSY; 427 } 428 429 static int send_rts(struct ldc_channel *lp) 430 { 431 struct ldc_packet *p; 432 unsigned long new_tail; 433 434 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0, 435 &new_tail); 436 if (p) { 437 p->env = lp->cfg.mode; 438 p->seqid = 0; 439 lp->rcv_nxt = 0; 440 441 ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n", 442 p->env, p->seqid); 443 444 return send_tx_packet(lp, p, new_tail); 445 } 446 return -EBUSY; 447 } 448 449 static int send_rtr(struct ldc_channel *lp) 450 { 451 struct ldc_packet *p; 452 unsigned long new_tail; 453 454 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0, 455 &new_tail); 456 if (p) { 457 p->env = lp->cfg.mode; 458 p->seqid = 0; 459 460 ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n", 461 p->env, p->seqid); 462 463 return send_tx_packet(lp, p, new_tail); 464 } 465 return -EBUSY; 466 } 467 468 static int send_rdx(struct ldc_channel *lp) 469 { 470 struct ldc_packet *p; 471 unsigned long new_tail; 472 473 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0, 474 &new_tail); 475 if (p) { 476 p->env = 0; 477 p->seqid = ++lp->snd_nxt; 478 p->u.r.ackid = lp->rcv_nxt; 479 480 ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n", 481 p->env, p->seqid, p->u.r.ackid); 482 483 return send_tx_packet(lp, p, new_tail); 484 } 485 return -EBUSY; 486 } 487 488 static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt) 489 { 490 struct ldc_packet *p; 491 unsigned long new_tail; 492 int err; 493 494 p = data_get_tx_packet(lp, &new_tail); 495 if (!p) 496 return -EBUSY; 497 memset(p, 0, sizeof(*p)); 498 p->type = data_pkt->type; 499 p->stype = LDC_NACK; 500 p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK; 501 p->seqid = lp->snd_nxt + 1; 502 p->u.r.ackid = lp->rcv_nxt; 503 504 ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n", 505 p->type, p->ctrl, p->seqid, p->u.r.ackid); 506 507 err = send_tx_packet(lp, p, new_tail); 508 if (!err) 509 lp->snd_nxt++; 510 511 return err; 512 } 513 514 static int ldc_abort(struct ldc_channel *lp) 515 { 516 unsigned long hv_err; 517 518 ldcdbg(STATE, "ABORT\n"); 519 520 /* We report but do not act upon the hypervisor errors because 521 * there really isn't much we can do if they fail at this point. 522 */ 523 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); 524 if (hv_err) 525 printk(KERN_ERR PFX "ldc_abort: " 526 "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n", 527 lp->id, lp->tx_ra, lp->tx_num_entries, hv_err); 528 529 hv_err = sun4v_ldc_tx_get_state(lp->id, 530 &lp->tx_head, 531 &lp->tx_tail, 532 &lp->chan_state); 533 if (hv_err) 534 printk(KERN_ERR PFX "ldc_abort: " 535 "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n", 536 lp->id, hv_err); 537 538 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); 539 if (hv_err) 540 printk(KERN_ERR PFX "ldc_abort: " 541 "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n", 542 lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); 543 544 /* Refetch the RX queue state as well, because we could be invoked 545 * here in the queue processing context. 546 */ 547 hv_err = sun4v_ldc_rx_get_state(lp->id, 548 &lp->rx_head, 549 &lp->rx_tail, 550 &lp->chan_state); 551 if (hv_err) 552 printk(KERN_ERR PFX "ldc_abort: " 553 "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n", 554 lp->id, hv_err); 555 556 return -ECONNRESET; 557 } 558 559 static struct ldc_version *find_by_major(u16 major) 560 { 561 struct ldc_version *ret = NULL; 562 int i; 563 564 for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { 565 struct ldc_version *v = &ver_arr[i]; 566 if (v->major <= major) { 567 ret = v; 568 break; 569 } 570 } 571 return ret; 572 } 573 574 static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) 575 { 576 struct ldc_version *vap; 577 int err; 578 579 ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n", 580 vp->major, vp->minor); 581 582 if (lp->hs_state == LDC_HS_GOTVERS) { 583 lp->hs_state = LDC_HS_OPEN; 584 memset(&lp->ver, 0, sizeof(lp->ver)); 585 } 586 587 vap = find_by_major(vp->major); 588 if (!vap) { 589 err = send_version_nack(lp, 0, 0); 590 } else if (vap->major != vp->major) { 591 err = send_version_nack(lp, vap->major, vap->minor); 592 } else { 593 struct ldc_version ver = *vp; 594 if (ver.minor > vap->minor) 595 ver.minor = vap->minor; 596 err = send_version_ack(lp, &ver); 597 if (!err) { 598 lp->ver = ver; 599 lp->hs_state = LDC_HS_GOTVERS; 600 } 601 } 602 if (err) 603 return ldc_abort(lp); 604 605 return 0; 606 } 607 608 static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp) 609 { 610 ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n", 611 vp->major, vp->minor); 612 613 if (lp->hs_state == LDC_HS_GOTVERS) { 614 if (lp->ver.major != vp->major || 615 lp->ver.minor != vp->minor) 616 return ldc_abort(lp); 617 } else { 618 lp->ver = *vp; 619 lp->hs_state = LDC_HS_GOTVERS; 620 } 621 if (send_rts(lp)) 622 return ldc_abort(lp); 623 return 0; 624 } 625 626 static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp) 627 { 628 struct ldc_version *vap; 629 struct ldc_packet *p; 630 unsigned long new_tail; 631 632 if (vp->major == 0 && vp->minor == 0) 633 return ldc_abort(lp); 634 635 vap = find_by_major(vp->major); 636 if (!vap) 637 return ldc_abort(lp); 638 639 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, 640 vap, sizeof(*vap), 641 &new_tail); 642 if (!p) 643 return ldc_abort(lp); 644 645 return send_tx_packet(lp, p, new_tail); 646 } 647 648 static int process_version(struct ldc_channel *lp, 649 struct ldc_packet *p) 650 { 651 struct ldc_version *vp; 652 653 vp = (struct ldc_version *) p->u.u_data; 654 655 switch (p->stype) { 656 case LDC_INFO: 657 return process_ver_info(lp, vp); 658 659 case LDC_ACK: 660 return process_ver_ack(lp, vp); 661 662 case LDC_NACK: 663 return process_ver_nack(lp, vp); 664 665 default: 666 return ldc_abort(lp); 667 } 668 } 669 670 static int process_rts(struct ldc_channel *lp, 671 struct ldc_packet *p) 672 { 673 ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n", 674 p->stype, p->seqid, p->env); 675 676 if (p->stype != LDC_INFO || 677 lp->hs_state != LDC_HS_GOTVERS || 678 p->env != lp->cfg.mode) 679 return ldc_abort(lp); 680 681 lp->snd_nxt = p->seqid; 682 lp->rcv_nxt = p->seqid; 683 lp->hs_state = LDC_HS_SENTRTR; 684 if (send_rtr(lp)) 685 return ldc_abort(lp); 686 687 return 0; 688 } 689 690 static int process_rtr(struct ldc_channel *lp, 691 struct ldc_packet *p) 692 { 693 ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n", 694 p->stype, p->seqid, p->env); 695 696 if (p->stype != LDC_INFO || 697 p->env != lp->cfg.mode) 698 return ldc_abort(lp); 699 700 lp->snd_nxt = p->seqid; 701 lp->hs_state = LDC_HS_COMPLETE; 702 ldc_set_state(lp, LDC_STATE_CONNECTED); 703 send_rdx(lp); 704 705 return LDC_EVENT_UP; 706 } 707 708 static int rx_seq_ok(struct ldc_channel *lp, u32 seqid) 709 { 710 return lp->rcv_nxt + 1 == seqid; 711 } 712 713 static int process_rdx(struct ldc_channel *lp, 714 struct ldc_packet *p) 715 { 716 ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n", 717 p->stype, p->seqid, p->env, p->u.r.ackid); 718 719 if (p->stype != LDC_INFO || 720 !(rx_seq_ok(lp, p->seqid))) 721 return ldc_abort(lp); 722 723 lp->rcv_nxt = p->seqid; 724 725 lp->hs_state = LDC_HS_COMPLETE; 726 ldc_set_state(lp, LDC_STATE_CONNECTED); 727 728 return LDC_EVENT_UP; 729 } 730 731 static int process_control_frame(struct ldc_channel *lp, 732 struct ldc_packet *p) 733 { 734 switch (p->ctrl) { 735 case LDC_VERS: 736 return process_version(lp, p); 737 738 case LDC_RTS: 739 return process_rts(lp, p); 740 741 case LDC_RTR: 742 return process_rtr(lp, p); 743 744 case LDC_RDX: 745 return process_rdx(lp, p); 746 747 default: 748 return ldc_abort(lp); 749 } 750 } 751 752 static int process_error_frame(struct ldc_channel *lp, 753 struct ldc_packet *p) 754 { 755 return ldc_abort(lp); 756 } 757 758 static int process_data_ack(struct ldc_channel *lp, 759 struct ldc_packet *ack) 760 { 761 unsigned long head = lp->tx_acked; 762 u32 ackid = ack->u.r.ackid; 763 764 while (1) { 765 struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE); 766 767 head = tx_advance(lp, head); 768 769 if (p->seqid == ackid) { 770 lp->tx_acked = head; 771 return 0; 772 } 773 if (head == lp->tx_tail) 774 return ldc_abort(lp); 775 } 776 777 return 0; 778 } 779 780 static void send_events(struct ldc_channel *lp, unsigned int event_mask) 781 { 782 if (event_mask & LDC_EVENT_RESET) 783 lp->cfg.event(lp->event_arg, LDC_EVENT_RESET); 784 if (event_mask & LDC_EVENT_UP) 785 lp->cfg.event(lp->event_arg, LDC_EVENT_UP); 786 if (event_mask & LDC_EVENT_DATA_READY) 787 lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY); 788 } 789 790 static irqreturn_t ldc_rx(int irq, void *dev_id) 791 { 792 struct ldc_channel *lp = dev_id; 793 unsigned long orig_state, hv_err, flags; 794 unsigned int event_mask; 795 796 spin_lock_irqsave(&lp->lock, flags); 797 798 orig_state = lp->chan_state; 799 hv_err = sun4v_ldc_rx_get_state(lp->id, 800 &lp->rx_head, 801 &lp->rx_tail, 802 &lp->chan_state); 803 804 ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", 805 orig_state, lp->chan_state, lp->rx_head, lp->rx_tail); 806 807 event_mask = 0; 808 809 if (lp->cfg.mode == LDC_MODE_RAW && 810 lp->chan_state == LDC_CHANNEL_UP) { 811 lp->hs_state = LDC_HS_COMPLETE; 812 ldc_set_state(lp, LDC_STATE_CONNECTED); 813 814 event_mask |= LDC_EVENT_UP; 815 816 orig_state = lp->chan_state; 817 } 818 819 /* If we are in reset state, flush the RX queue and ignore 820 * everything. 821 */ 822 if (lp->flags & LDC_FLAG_RESET) { 823 (void) __set_rx_head(lp, lp->rx_tail); 824 goto out; 825 } 826 827 /* Once we finish the handshake, we let the ldc_read() 828 * paths do all of the control frame and state management. 829 * Just trigger the callback. 830 */ 831 if (lp->hs_state == LDC_HS_COMPLETE) { 832 handshake_complete: 833 if (lp->chan_state != orig_state) { 834 unsigned int event = LDC_EVENT_RESET; 835 836 if (lp->chan_state == LDC_CHANNEL_UP) 837 event = LDC_EVENT_UP; 838 839 event_mask |= event; 840 } 841 if (lp->rx_head != lp->rx_tail) 842 event_mask |= LDC_EVENT_DATA_READY; 843 844 goto out; 845 } 846 847 if (lp->chan_state != orig_state) 848 goto out; 849 850 while (lp->rx_head != lp->rx_tail) { 851 struct ldc_packet *p; 852 unsigned long new; 853 int err; 854 855 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); 856 857 switch (p->type) { 858 case LDC_CTRL: 859 err = process_control_frame(lp, p); 860 if (err > 0) 861 event_mask |= err; 862 break; 863 864 case LDC_DATA: 865 event_mask |= LDC_EVENT_DATA_READY; 866 err = 0; 867 break; 868 869 case LDC_ERR: 870 err = process_error_frame(lp, p); 871 break; 872 873 default: 874 err = ldc_abort(lp); 875 break; 876 } 877 878 if (err < 0) 879 break; 880 881 new = lp->rx_head; 882 new += LDC_PACKET_SIZE; 883 if (new == (lp->rx_num_entries * LDC_PACKET_SIZE)) 884 new = 0; 885 lp->rx_head = new; 886 887 err = __set_rx_head(lp, new); 888 if (err < 0) { 889 (void) ldc_abort(lp); 890 break; 891 } 892 if (lp->hs_state == LDC_HS_COMPLETE) 893 goto handshake_complete; 894 } 895 896 out: 897 spin_unlock_irqrestore(&lp->lock, flags); 898 899 send_events(lp, event_mask); 900 901 return IRQ_HANDLED; 902 } 903 904 static irqreturn_t ldc_tx(int irq, void *dev_id) 905 { 906 struct ldc_channel *lp = dev_id; 907 unsigned long flags, hv_err, orig_state; 908 unsigned int event_mask = 0; 909 910 spin_lock_irqsave(&lp->lock, flags); 911 912 orig_state = lp->chan_state; 913 hv_err = sun4v_ldc_tx_get_state(lp->id, 914 &lp->tx_head, 915 &lp->tx_tail, 916 &lp->chan_state); 917 918 ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", 919 orig_state, lp->chan_state, lp->tx_head, lp->tx_tail); 920 921 if (lp->cfg.mode == LDC_MODE_RAW && 922 lp->chan_state == LDC_CHANNEL_UP) { 923 lp->hs_state = LDC_HS_COMPLETE; 924 ldc_set_state(lp, LDC_STATE_CONNECTED); 925 926 event_mask |= LDC_EVENT_UP; 927 } 928 929 spin_unlock_irqrestore(&lp->lock, flags); 930 931 send_events(lp, event_mask); 932 933 return IRQ_HANDLED; 934 } 935 936 /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so 937 * XXX that addition and removal from the ldc_channel_list has 938 * XXX atomicity, otherwise the __ldc_channel_exists() check is 939 * XXX totally pointless as another thread can slip into ldc_alloc() 940 * XXX and add a channel with the same ID. There also needs to be 941 * XXX a spinlock for ldc_channel_list. 942 */ 943 static HLIST_HEAD(ldc_channel_list); 944 945 static int __ldc_channel_exists(unsigned long id) 946 { 947 struct ldc_channel *lp; 948 struct hlist_node *n; 949 950 hlist_for_each_entry(lp, n, &ldc_channel_list, list) { 951 if (lp->id == id) 952 return 1; 953 } 954 return 0; 955 } 956 957 static int alloc_queue(const char *name, unsigned long num_entries, 958 struct ldc_packet **base, unsigned long *ra) 959 { 960 unsigned long size, order; 961 void *q; 962 963 size = num_entries * LDC_PACKET_SIZE; 964 order = get_order(size); 965 966 q = (void *) __get_free_pages(GFP_KERNEL, order); 967 if (!q) { 968 printk(KERN_ERR PFX "Alloc of %s queue failed with " 969 "size=%lu order=%lu\n", name, size, order); 970 return -ENOMEM; 971 } 972 973 memset(q, 0, PAGE_SIZE << order); 974 975 *base = q; 976 *ra = __pa(q); 977 978 return 0; 979 } 980 981 static void free_queue(unsigned long num_entries, struct ldc_packet *q) 982 { 983 unsigned long size, order; 984 985 if (!q) 986 return; 987 988 size = num_entries * LDC_PACKET_SIZE; 989 order = get_order(size); 990 991 free_pages((unsigned long)q, order); 992 } 993 994 /* XXX Make this configurable... XXX */ 995 #define LDC_IOTABLE_SIZE (8 * 1024) 996 997 static int ldc_iommu_init(struct ldc_channel *lp) 998 { 999 unsigned long sz, num_tsb_entries, tsbsize, order; 1000 struct ldc_iommu *iommu = &lp->iommu; 1001 struct ldc_mtable_entry *table; 1002 unsigned long hv_err; 1003 int err; 1004 1005 num_tsb_entries = LDC_IOTABLE_SIZE; 1006 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); 1007 1008 spin_lock_init(&iommu->lock); 1009 1010 sz = num_tsb_entries / 8; 1011 sz = (sz + 7UL) & ~7UL; 1012 iommu->arena.map = kzalloc(sz, GFP_KERNEL); 1013 if (!iommu->arena.map) { 1014 printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); 1015 return -ENOMEM; 1016 } 1017 1018 iommu->arena.limit = num_tsb_entries; 1019 1020 order = get_order(tsbsize); 1021 1022 table = (struct ldc_mtable_entry *) 1023 __get_free_pages(GFP_KERNEL, order); 1024 err = -ENOMEM; 1025 if (!table) { 1026 printk(KERN_ERR PFX "Alloc of MTE table failed, " 1027 "size=%lu order=%lu\n", tsbsize, order); 1028 goto out_free_map; 1029 } 1030 1031 memset(table, 0, PAGE_SIZE << order); 1032 1033 iommu->page_table = table; 1034 1035 hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), 1036 num_tsb_entries); 1037 err = -EINVAL; 1038 if (hv_err) 1039 goto out_free_table; 1040 1041 return 0; 1042 1043 out_free_table: 1044 free_pages((unsigned long) table, order); 1045 iommu->page_table = NULL; 1046 1047 out_free_map: 1048 kfree(iommu->arena.map); 1049 iommu->arena.map = NULL; 1050 1051 return err; 1052 } 1053 1054 static void ldc_iommu_release(struct ldc_channel *lp) 1055 { 1056 struct ldc_iommu *iommu = &lp->iommu; 1057 unsigned long num_tsb_entries, tsbsize, order; 1058 1059 (void) sun4v_ldc_set_map_table(lp->id, 0, 0); 1060 1061 num_tsb_entries = iommu->arena.limit; 1062 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); 1063 order = get_order(tsbsize); 1064 1065 free_pages((unsigned long) iommu->page_table, order); 1066 iommu->page_table = NULL; 1067 1068 kfree(iommu->arena.map); 1069 iommu->arena.map = NULL; 1070 } 1071 1072 struct ldc_channel *ldc_alloc(unsigned long id, 1073 const struct ldc_channel_config *cfgp, 1074 void *event_arg) 1075 { 1076 struct ldc_channel *lp; 1077 const struct ldc_mode_ops *mops; 1078 unsigned long dummy1, dummy2, hv_err; 1079 u8 mss, *mssbuf; 1080 int err; 1081 1082 err = -ENODEV; 1083 if (!ldom_domaining_enabled) 1084 goto out_err; 1085 1086 err = -EINVAL; 1087 if (!cfgp) 1088 goto out_err; 1089 1090 switch (cfgp->mode) { 1091 case LDC_MODE_RAW: 1092 mops = &raw_ops; 1093 mss = LDC_PACKET_SIZE; 1094 break; 1095 1096 case LDC_MODE_UNRELIABLE: 1097 mops = &nonraw_ops; 1098 mss = LDC_PACKET_SIZE - 8; 1099 break; 1100 1101 case LDC_MODE_STREAM: 1102 mops = &stream_ops; 1103 mss = LDC_PACKET_SIZE - 8 - 8; 1104 break; 1105 1106 default: 1107 goto out_err; 1108 } 1109 1110 if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) 1111 goto out_err; 1112 1113 hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); 1114 err = -ENODEV; 1115 if (hv_err == HV_ECHANNEL) 1116 goto out_err; 1117 1118 err = -EEXIST; 1119 if (__ldc_channel_exists(id)) 1120 goto out_err; 1121 1122 mssbuf = NULL; 1123 1124 lp = kzalloc(sizeof(*lp), GFP_KERNEL); 1125 err = -ENOMEM; 1126 if (!lp) 1127 goto out_err; 1128 1129 spin_lock_init(&lp->lock); 1130 1131 lp->id = id; 1132 1133 err = ldc_iommu_init(lp); 1134 if (err) 1135 goto out_free_ldc; 1136 1137 lp->mops = mops; 1138 lp->mss = mss; 1139 1140 lp->cfg = *cfgp; 1141 if (!lp->cfg.mtu) 1142 lp->cfg.mtu = LDC_DEFAULT_MTU; 1143 1144 if (lp->cfg.mode == LDC_MODE_STREAM) { 1145 mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL); 1146 if (!mssbuf) { 1147 err = -ENOMEM; 1148 goto out_free_iommu; 1149 } 1150 lp->mssbuf = mssbuf; 1151 } 1152 1153 lp->event_arg = event_arg; 1154 1155 /* XXX allow setting via ldc_channel_config to override defaults 1156 * XXX or use some formula based upon mtu 1157 */ 1158 lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; 1159 lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; 1160 1161 err = alloc_queue("TX", lp->tx_num_entries, 1162 &lp->tx_base, &lp->tx_ra); 1163 if (err) 1164 goto out_free_mssbuf; 1165 1166 err = alloc_queue("RX", lp->rx_num_entries, 1167 &lp->rx_base, &lp->rx_ra); 1168 if (err) 1169 goto out_free_txq; 1170 1171 lp->flags |= LDC_FLAG_ALLOCED_QUEUES; 1172 1173 lp->hs_state = LDC_HS_CLOSED; 1174 ldc_set_state(lp, LDC_STATE_INIT); 1175 1176 INIT_HLIST_NODE(&lp->list); 1177 hlist_add_head(&lp->list, &ldc_channel_list); 1178 1179 INIT_HLIST_HEAD(&lp->mh_list); 1180 1181 return lp; 1182 1183 out_free_txq: 1184 free_queue(lp->tx_num_entries, lp->tx_base); 1185 1186 out_free_mssbuf: 1187 kfree(mssbuf); 1188 1189 out_free_iommu: 1190 ldc_iommu_release(lp); 1191 1192 out_free_ldc: 1193 kfree(lp); 1194 1195 out_err: 1196 return ERR_PTR(err); 1197 } 1198 EXPORT_SYMBOL(ldc_alloc); 1199 1200 void ldc_free(struct ldc_channel *lp) 1201 { 1202 if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { 1203 free_irq(lp->cfg.rx_irq, lp); 1204 free_irq(lp->cfg.tx_irq, lp); 1205 } 1206 1207 if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { 1208 sun4v_ldc_tx_qconf(lp->id, 0, 0); 1209 sun4v_ldc_rx_qconf(lp->id, 0, 0); 1210 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; 1211 } 1212 if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { 1213 free_queue(lp->tx_num_entries, lp->tx_base); 1214 free_queue(lp->rx_num_entries, lp->rx_base); 1215 lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; 1216 } 1217 1218 hlist_del(&lp->list); 1219 1220 kfree(lp->mssbuf); 1221 1222 ldc_iommu_release(lp); 1223 1224 kfree(lp); 1225 } 1226 EXPORT_SYMBOL(ldc_free); 1227 1228 /* Bind the channel. This registers the LDC queues with 1229 * the hypervisor and puts the channel into a pseudo-listening 1230 * state. This does not initiate a handshake, ldc_connect() does 1231 * that. 1232 */ 1233 int ldc_bind(struct ldc_channel *lp, const char *name) 1234 { 1235 unsigned long hv_err, flags; 1236 int err = -EINVAL; 1237 1238 if (!name || 1239 (lp->state != LDC_STATE_INIT)) 1240 return -EINVAL; 1241 1242 snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); 1243 snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); 1244 1245 err = request_irq(lp->cfg.rx_irq, ldc_rx, 1246 IRQF_SAMPLE_RANDOM | IRQF_DISABLED, 1247 lp->rx_irq_name, lp); 1248 if (err) 1249 return err; 1250 1251 err = request_irq(lp->cfg.tx_irq, ldc_tx, 1252 IRQF_SAMPLE_RANDOM | IRQF_DISABLED, 1253 lp->tx_irq_name, lp); 1254 if (err) { 1255 free_irq(lp->cfg.rx_irq, lp); 1256 return err; 1257 } 1258 1259 1260 spin_lock_irqsave(&lp->lock, flags); 1261 1262 enable_irq(lp->cfg.rx_irq); 1263 enable_irq(lp->cfg.tx_irq); 1264 1265 lp->flags |= LDC_FLAG_REGISTERED_IRQS; 1266 1267 err = -ENODEV; 1268 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); 1269 if (hv_err) 1270 goto out_free_irqs; 1271 1272 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); 1273 if (hv_err) 1274 goto out_free_irqs; 1275 1276 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); 1277 if (hv_err) 1278 goto out_unmap_tx; 1279 1280 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); 1281 if (hv_err) 1282 goto out_unmap_tx; 1283 1284 lp->flags |= LDC_FLAG_REGISTERED_QUEUES; 1285 1286 hv_err = sun4v_ldc_tx_get_state(lp->id, 1287 &lp->tx_head, 1288 &lp->tx_tail, 1289 &lp->chan_state); 1290 err = -EBUSY; 1291 if (hv_err) 1292 goto out_unmap_rx; 1293 1294 lp->tx_acked = lp->tx_head; 1295 1296 lp->hs_state = LDC_HS_OPEN; 1297 ldc_set_state(lp, LDC_STATE_BOUND); 1298 1299 spin_unlock_irqrestore(&lp->lock, flags); 1300 1301 return 0; 1302 1303 out_unmap_rx: 1304 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; 1305 sun4v_ldc_rx_qconf(lp->id, 0, 0); 1306 1307 out_unmap_tx: 1308 sun4v_ldc_tx_qconf(lp->id, 0, 0); 1309 1310 out_free_irqs: 1311 lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; 1312 free_irq(lp->cfg.tx_irq, lp); 1313 free_irq(lp->cfg.rx_irq, lp); 1314 1315 spin_unlock_irqrestore(&lp->lock, flags); 1316 1317 return err; 1318 } 1319 EXPORT_SYMBOL(ldc_bind); 1320 1321 int ldc_connect(struct ldc_channel *lp) 1322 { 1323 unsigned long flags; 1324 int err; 1325 1326 if (lp->cfg.mode == LDC_MODE_RAW) 1327 return -EINVAL; 1328 1329 spin_lock_irqsave(&lp->lock, flags); 1330 1331 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || 1332 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) || 1333 lp->hs_state != LDC_HS_OPEN) 1334 err = -EINVAL; 1335 else 1336 err = start_handshake(lp); 1337 1338 spin_unlock_irqrestore(&lp->lock, flags); 1339 1340 return err; 1341 } 1342 EXPORT_SYMBOL(ldc_connect); 1343 1344 int ldc_disconnect(struct ldc_channel *lp) 1345 { 1346 unsigned long hv_err, flags; 1347 int err; 1348 1349 if (lp->cfg.mode == LDC_MODE_RAW) 1350 return -EINVAL; 1351 1352 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || 1353 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES)) 1354 return -EINVAL; 1355 1356 spin_lock_irqsave(&lp->lock, flags); 1357 1358 err = -ENODEV; 1359 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); 1360 if (hv_err) 1361 goto out_err; 1362 1363 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); 1364 if (hv_err) 1365 goto out_err; 1366 1367 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); 1368 if (hv_err) 1369 goto out_err; 1370 1371 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); 1372 if (hv_err) 1373 goto out_err; 1374 1375 ldc_set_state(lp, LDC_STATE_BOUND); 1376 lp->hs_state = LDC_HS_OPEN; 1377 lp->flags |= LDC_FLAG_RESET; 1378 1379 spin_unlock_irqrestore(&lp->lock, flags); 1380 1381 return 0; 1382 1383 out_err: 1384 sun4v_ldc_tx_qconf(lp->id, 0, 0); 1385 sun4v_ldc_rx_qconf(lp->id, 0, 0); 1386 free_irq(lp->cfg.tx_irq, lp); 1387 free_irq(lp->cfg.rx_irq, lp); 1388 lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS | 1389 LDC_FLAG_REGISTERED_QUEUES); 1390 ldc_set_state(lp, LDC_STATE_INIT); 1391 1392 spin_unlock_irqrestore(&lp->lock, flags); 1393 1394 return err; 1395 } 1396 EXPORT_SYMBOL(ldc_disconnect); 1397 1398 int ldc_state(struct ldc_channel *lp) 1399 { 1400 return lp->state; 1401 } 1402 EXPORT_SYMBOL(ldc_state); 1403 1404 static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) 1405 { 1406 struct ldc_packet *p; 1407 unsigned long new_tail; 1408 int err; 1409 1410 if (size > LDC_PACKET_SIZE) 1411 return -EMSGSIZE; 1412 1413 p = data_get_tx_packet(lp, &new_tail); 1414 if (!p) 1415 return -EAGAIN; 1416 1417 memcpy(p, buf, size); 1418 1419 err = send_tx_packet(lp, p, new_tail); 1420 if (!err) 1421 err = size; 1422 1423 return err; 1424 } 1425 1426 static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size) 1427 { 1428 struct ldc_packet *p; 1429 unsigned long hv_err, new; 1430 int err; 1431 1432 if (size < LDC_PACKET_SIZE) 1433 return -EINVAL; 1434 1435 hv_err = sun4v_ldc_rx_get_state(lp->id, 1436 &lp->rx_head, 1437 &lp->rx_tail, 1438 &lp->chan_state); 1439 if (hv_err) 1440 return ldc_abort(lp); 1441 1442 if (lp->chan_state == LDC_CHANNEL_DOWN || 1443 lp->chan_state == LDC_CHANNEL_RESETTING) 1444 return -ECONNRESET; 1445 1446 if (lp->rx_head == lp->rx_tail) 1447 return 0; 1448 1449 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); 1450 memcpy(buf, p, LDC_PACKET_SIZE); 1451 1452 new = rx_advance(lp, lp->rx_head); 1453 lp->rx_head = new; 1454 1455 err = __set_rx_head(lp, new); 1456 if (err < 0) 1457 err = -ECONNRESET; 1458 else 1459 err = LDC_PACKET_SIZE; 1460 1461 return err; 1462 } 1463 1464 static const struct ldc_mode_ops raw_ops = { 1465 .write = write_raw, 1466 .read = read_raw, 1467 }; 1468 1469 static int write_nonraw(struct ldc_channel *lp, const void *buf, 1470 unsigned int size) 1471 { 1472 unsigned long hv_err, tail; 1473 unsigned int copied; 1474 u32 seq; 1475 int err; 1476 1477 hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, 1478 &lp->chan_state); 1479 if (unlikely(hv_err)) 1480 return -EBUSY; 1481 1482 if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) 1483 return ldc_abort(lp); 1484 1485 if (!tx_has_space_for(lp, size)) 1486 return -EAGAIN; 1487 1488 seq = lp->snd_nxt; 1489 copied = 0; 1490 tail = lp->tx_tail; 1491 while (copied < size) { 1492 struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE); 1493 u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ? 1494 p->u.u_data : 1495 p->u.r.r_data); 1496 int data_len; 1497 1498 p->type = LDC_DATA; 1499 p->stype = LDC_INFO; 1500 p->ctrl = 0; 1501 1502 data_len = size - copied; 1503 if (data_len > lp->mss) 1504 data_len = lp->mss; 1505 1506 BUG_ON(data_len > LDC_LEN); 1507 1508 p->env = (data_len | 1509 (copied == 0 ? LDC_START : 0) | 1510 (data_len == size - copied ? LDC_STOP : 0)); 1511 1512 p->seqid = ++seq; 1513 1514 ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n", 1515 p->type, 1516 p->stype, 1517 p->ctrl, 1518 p->env, 1519 p->seqid); 1520 1521 memcpy(data, buf, data_len); 1522 buf += data_len; 1523 copied += data_len; 1524 1525 tail = tx_advance(lp, tail); 1526 } 1527 1528 err = set_tx_tail(lp, tail); 1529 if (!err) { 1530 lp->snd_nxt = seq; 1531 err = size; 1532 } 1533 1534 return err; 1535 } 1536 1537 static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p, 1538 struct ldc_packet *first_frag) 1539 { 1540 int err; 1541 1542 if (first_frag) 1543 lp->rcv_nxt = first_frag->seqid - 1; 1544 1545 err = send_data_nack(lp, p); 1546 if (err) 1547 return err; 1548 1549 err = __set_rx_head(lp, lp->rx_tail); 1550 if (err < 0) 1551 return ldc_abort(lp); 1552 1553 return 0; 1554 } 1555 1556 static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p) 1557 { 1558 if (p->stype & LDC_ACK) { 1559 int err = process_data_ack(lp, p); 1560 if (err) 1561 return err; 1562 } 1563 if (p->stype & LDC_NACK) 1564 return ldc_abort(lp); 1565 1566 return 0; 1567 } 1568 1569 static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head) 1570 { 1571 unsigned long dummy; 1572 int limit = 1000; 1573 1574 ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n", 1575 cur_head, lp->rx_head, lp->rx_tail); 1576 while (limit-- > 0) { 1577 unsigned long hv_err; 1578 1579 hv_err = sun4v_ldc_rx_get_state(lp->id, 1580 &dummy, 1581 &lp->rx_tail, 1582 &lp->chan_state); 1583 if (hv_err) 1584 return ldc_abort(lp); 1585 1586 if (lp->chan_state == LDC_CHANNEL_DOWN || 1587 lp->chan_state == LDC_CHANNEL_RESETTING) 1588 return -ECONNRESET; 1589 1590 if (cur_head != lp->rx_tail) { 1591 ldcdbg(DATA, "DATA WAIT DONE " 1592 "head[%lx] tail[%lx] chan_state[%lx]\n", 1593 dummy, lp->rx_tail, lp->chan_state); 1594 return 0; 1595 } 1596 1597 udelay(1); 1598 } 1599 return -EAGAIN; 1600 } 1601 1602 static int rx_set_head(struct ldc_channel *lp, unsigned long head) 1603 { 1604 int err = __set_rx_head(lp, head); 1605 1606 if (err < 0) 1607 return ldc_abort(lp); 1608 1609 lp->rx_head = head; 1610 return 0; 1611 } 1612 1613 static void send_data_ack(struct ldc_channel *lp) 1614 { 1615 unsigned long new_tail; 1616 struct ldc_packet *p; 1617 1618 p = data_get_tx_packet(lp, &new_tail); 1619 if (likely(p)) { 1620 int err; 1621 1622 memset(p, 0, sizeof(*p)); 1623 p->type = LDC_DATA; 1624 p->stype = LDC_ACK; 1625 p->ctrl = 0; 1626 p->seqid = lp->snd_nxt + 1; 1627 p->u.r.ackid = lp->rcv_nxt; 1628 1629 err = send_tx_packet(lp, p, new_tail); 1630 if (!err) 1631 lp->snd_nxt++; 1632 } 1633 } 1634 1635 static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size) 1636 { 1637 struct ldc_packet *first_frag; 1638 unsigned long hv_err, new; 1639 int err, copied; 1640 1641 hv_err = sun4v_ldc_rx_get_state(lp->id, 1642 &lp->rx_head, 1643 &lp->rx_tail, 1644 &lp->chan_state); 1645 if (hv_err) 1646 return ldc_abort(lp); 1647 1648 if (lp->chan_state == LDC_CHANNEL_DOWN || 1649 lp->chan_state == LDC_CHANNEL_RESETTING) 1650 return -ECONNRESET; 1651 1652 if (lp->rx_head == lp->rx_tail) 1653 return 0; 1654 1655 first_frag = NULL; 1656 copied = err = 0; 1657 new = lp->rx_head; 1658 while (1) { 1659 struct ldc_packet *p; 1660 int pkt_len; 1661 1662 BUG_ON(new == lp->rx_tail); 1663 p = lp->rx_base + (new / LDC_PACKET_SIZE); 1664 1665 ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " 1666 "rcv_nxt[%08x]\n", 1667 p->type, 1668 p->stype, 1669 p->ctrl, 1670 p->env, 1671 p->seqid, 1672 p->u.r.ackid, 1673 lp->rcv_nxt); 1674 1675 if (unlikely(!rx_seq_ok(lp, p->seqid))) { 1676 err = rx_bad_seq(lp, p, first_frag); 1677 copied = 0; 1678 break; 1679 } 1680 1681 if (p->type & LDC_CTRL) { 1682 err = process_control_frame(lp, p); 1683 if (err < 0) 1684 break; 1685 err = 0; 1686 } 1687 1688 lp->rcv_nxt = p->seqid; 1689 1690 if (!(p->type & LDC_DATA)) { 1691 new = rx_advance(lp, new); 1692 goto no_data; 1693 } 1694 if (p->stype & (LDC_ACK | LDC_NACK)) { 1695 err = data_ack_nack(lp, p); 1696 if (err) 1697 break; 1698 } 1699 if (!(p->stype & LDC_INFO)) { 1700 new = rx_advance(lp, new); 1701 err = rx_set_head(lp, new); 1702 if (err) 1703 break; 1704 goto no_data; 1705 } 1706 1707 pkt_len = p->env & LDC_LEN; 1708 1709 /* Every initial packet starts with the START bit set. 1710 * 1711 * Singleton packets will have both START+STOP set. 1712 * 1713 * Fragments will have START set in the first frame, STOP 1714 * set in the last frame, and neither bit set in middle 1715 * frames of the packet. 1716 * 1717 * Therefore if we are at the beginning of a packet and 1718 * we don't see START, or we are in the middle of a fragmented 1719 * packet and do see START, we are unsynchronized and should 1720 * flush the RX queue. 1721 */ 1722 if ((first_frag == NULL && !(p->env & LDC_START)) || 1723 (first_frag != NULL && (p->env & LDC_START))) { 1724 if (!first_frag) 1725 new = rx_advance(lp, new); 1726 1727 err = rx_set_head(lp, new); 1728 if (err) 1729 break; 1730 1731 if (!first_frag) 1732 goto no_data; 1733 } 1734 if (!first_frag) 1735 first_frag = p; 1736 1737 if (pkt_len > size - copied) { 1738 /* User didn't give us a big enough buffer, 1739 * what to do? This is a pretty serious error. 1740 * 1741 * Since we haven't updated the RX ring head to 1742 * consume any of the packets, signal the error 1743 * to the user and just leave the RX ring alone. 1744 * 1745 * This seems the best behavior because this allows 1746 * a user of the LDC layer to start with a small 1747 * RX buffer for ldc_read() calls and use -EMSGSIZE 1748 * as a cue to enlarge it's read buffer. 1749 */ 1750 err = -EMSGSIZE; 1751 break; 1752 } 1753 1754 /* Ok, we are gonna eat this one. */ 1755 new = rx_advance(lp, new); 1756 1757 memcpy(buf, 1758 (lp->cfg.mode == LDC_MODE_UNRELIABLE ? 1759 p->u.u_data : p->u.r.r_data), pkt_len); 1760 buf += pkt_len; 1761 copied += pkt_len; 1762 1763 if (p->env & LDC_STOP) 1764 break; 1765 1766 no_data: 1767 if (new == lp->rx_tail) { 1768 err = rx_data_wait(lp, new); 1769 if (err) 1770 break; 1771 } 1772 } 1773 1774 if (!err) 1775 err = rx_set_head(lp, new); 1776 1777 if (err && first_frag) 1778 lp->rcv_nxt = first_frag->seqid - 1; 1779 1780 if (!err) { 1781 err = copied; 1782 if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) 1783 send_data_ack(lp); 1784 } 1785 1786 return err; 1787 } 1788 1789 static const struct ldc_mode_ops nonraw_ops = { 1790 .write = write_nonraw, 1791 .read = read_nonraw, 1792 }; 1793 1794 static int write_stream(struct ldc_channel *lp, const void *buf, 1795 unsigned int size) 1796 { 1797 if (size > lp->cfg.mtu) 1798 size = lp->cfg.mtu; 1799 return write_nonraw(lp, buf, size); 1800 } 1801 1802 static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size) 1803 { 1804 if (!lp->mssbuf_len) { 1805 int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); 1806 if (err < 0) 1807 return err; 1808 1809 lp->mssbuf_len = err; 1810 lp->mssbuf_off = 0; 1811 } 1812 1813 if (size > lp->mssbuf_len) 1814 size = lp->mssbuf_len; 1815 memcpy(buf, lp->mssbuf + lp->mssbuf_off, size); 1816 1817 lp->mssbuf_off += size; 1818 lp->mssbuf_len -= size; 1819 1820 return size; 1821 } 1822 1823 static const struct ldc_mode_ops stream_ops = { 1824 .write = write_stream, 1825 .read = read_stream, 1826 }; 1827 1828 int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size) 1829 { 1830 unsigned long flags; 1831 int err; 1832 1833 if (!buf) 1834 return -EINVAL; 1835 1836 if (!size) 1837 return 0; 1838 1839 spin_lock_irqsave(&lp->lock, flags); 1840 1841 if (lp->hs_state != LDC_HS_COMPLETE) 1842 err = -ENOTCONN; 1843 else 1844 err = lp->mops->write(lp, buf, size); 1845 1846 spin_unlock_irqrestore(&lp->lock, flags); 1847 1848 return err; 1849 } 1850 EXPORT_SYMBOL(ldc_write); 1851 1852 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size) 1853 { 1854 unsigned long flags; 1855 int err; 1856 1857 if (!buf) 1858 return -EINVAL; 1859 1860 if (!size) 1861 return 0; 1862 1863 spin_lock_irqsave(&lp->lock, flags); 1864 1865 if (lp->hs_state != LDC_HS_COMPLETE) 1866 err = -ENOTCONN; 1867 else 1868 err = lp->mops->read(lp, buf, size); 1869 1870 spin_unlock_irqrestore(&lp->lock, flags); 1871 1872 return err; 1873 } 1874 EXPORT_SYMBOL(ldc_read); 1875 1876 static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages) 1877 { 1878 struct iommu_arena *arena = &iommu->arena; 1879 unsigned long n, start, end, limit; 1880 int pass; 1881 1882 limit = arena->limit; 1883 start = arena->hint; 1884 pass = 0; 1885 1886 again: 1887 n = bitmap_find_next_zero_area(arena->map, limit, start, npages, 0); 1888 end = n + npages; 1889 if (unlikely(end >= limit)) { 1890 if (likely(pass < 1)) { 1891 limit = start; 1892 start = 0; 1893 pass++; 1894 goto again; 1895 } else { 1896 /* Scanned the whole thing, give up. */ 1897 return -1; 1898 } 1899 } 1900 bitmap_set(arena->map, n, npages); 1901 1902 arena->hint = end; 1903 1904 return n; 1905 } 1906 1907 #define COOKIE_PGSZ_CODE 0xf000000000000000ULL 1908 #define COOKIE_PGSZ_CODE_SHIFT 60ULL 1909 1910 static u64 pagesize_code(void) 1911 { 1912 switch (PAGE_SIZE) { 1913 default: 1914 case (8ULL * 1024ULL): 1915 return 0; 1916 case (64ULL * 1024ULL): 1917 return 1; 1918 case (512ULL * 1024ULL): 1919 return 2; 1920 case (4ULL * 1024ULL * 1024ULL): 1921 return 3; 1922 case (32ULL * 1024ULL * 1024ULL): 1923 return 4; 1924 case (256ULL * 1024ULL * 1024ULL): 1925 return 5; 1926 } 1927 } 1928 1929 static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) 1930 { 1931 return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | 1932 (index << PAGE_SHIFT) | 1933 page_offset); 1934 } 1935 1936 static u64 cookie_to_index(u64 cookie, unsigned long *shift) 1937 { 1938 u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; 1939 1940 cookie &= ~COOKIE_PGSZ_CODE; 1941 1942 *shift = szcode * 3; 1943 1944 return (cookie >> (13ULL + (szcode * 3ULL))); 1945 } 1946 1947 static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, 1948 unsigned long npages) 1949 { 1950 long entry; 1951 1952 entry = arena_alloc(iommu, npages); 1953 if (unlikely(entry < 0)) 1954 return NULL; 1955 1956 return iommu->page_table + entry; 1957 } 1958 1959 static u64 perm_to_mte(unsigned int map_perm) 1960 { 1961 u64 mte_base; 1962 1963 mte_base = pagesize_code(); 1964 1965 if (map_perm & LDC_MAP_SHADOW) { 1966 if (map_perm & LDC_MAP_R) 1967 mte_base |= LDC_MTE_COPY_R; 1968 if (map_perm & LDC_MAP_W) 1969 mte_base |= LDC_MTE_COPY_W; 1970 } 1971 if (map_perm & LDC_MAP_DIRECT) { 1972 if (map_perm & LDC_MAP_R) 1973 mte_base |= LDC_MTE_READ; 1974 if (map_perm & LDC_MAP_W) 1975 mte_base |= LDC_MTE_WRITE; 1976 if (map_perm & LDC_MAP_X) 1977 mte_base |= LDC_MTE_EXEC; 1978 } 1979 if (map_perm & LDC_MAP_IO) { 1980 if (map_perm & LDC_MAP_R) 1981 mte_base |= LDC_MTE_IOMMU_R; 1982 if (map_perm & LDC_MAP_W) 1983 mte_base |= LDC_MTE_IOMMU_W; 1984 } 1985 1986 return mte_base; 1987 } 1988 1989 static int pages_in_region(unsigned long base, long len) 1990 { 1991 int count = 0; 1992 1993 do { 1994 unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; 1995 1996 len -= (new - base); 1997 base = new; 1998 count++; 1999 } while (len > 0); 2000 2001 return count; 2002 } 2003 2004 struct cookie_state { 2005 struct ldc_mtable_entry *page_table; 2006 struct ldc_trans_cookie *cookies; 2007 u64 mte_base; 2008 u64 prev_cookie; 2009 u32 pte_idx; 2010 u32 nc; 2011 }; 2012 2013 static void fill_cookies(struct cookie_state *sp, unsigned long pa, 2014 unsigned long off, unsigned long len) 2015 { 2016 do { 2017 unsigned long tlen, new = pa + PAGE_SIZE; 2018 u64 this_cookie; 2019 2020 sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; 2021 2022 tlen = PAGE_SIZE; 2023 if (off) 2024 tlen = PAGE_SIZE - off; 2025 if (tlen > len) 2026 tlen = len; 2027 2028 this_cookie = make_cookie(sp->pte_idx, 2029 pagesize_code(), off); 2030 2031 off = 0; 2032 2033 if (this_cookie == sp->prev_cookie) { 2034 sp->cookies[sp->nc - 1].cookie_size += tlen; 2035 } else { 2036 sp->cookies[sp->nc].cookie_addr = this_cookie; 2037 sp->cookies[sp->nc].cookie_size = tlen; 2038 sp->nc++; 2039 } 2040 sp->prev_cookie = this_cookie + tlen; 2041 2042 sp->pte_idx++; 2043 2044 len -= tlen; 2045 pa = new; 2046 } while (len > 0); 2047 } 2048 2049 static int sg_count_one(struct scatterlist *sg) 2050 { 2051 unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; 2052 long len = sg->length; 2053 2054 if ((sg->offset | len) & (8UL - 1)) 2055 return -EFAULT; 2056 2057 return pages_in_region(base + sg->offset, len); 2058 } 2059 2060 static int sg_count_pages(struct scatterlist *sg, int num_sg) 2061 { 2062 int count; 2063 int i; 2064 2065 count = 0; 2066 for (i = 0; i < num_sg; i++) { 2067 int err = sg_count_one(sg + i); 2068 if (err < 0) 2069 return err; 2070 count += err; 2071 } 2072 2073 return count; 2074 } 2075 2076 int ldc_map_sg(struct ldc_channel *lp, 2077 struct scatterlist *sg, int num_sg, 2078 struct ldc_trans_cookie *cookies, int ncookies, 2079 unsigned int map_perm) 2080 { 2081 unsigned long i, npages, flags; 2082 struct ldc_mtable_entry *base; 2083 struct cookie_state state; 2084 struct ldc_iommu *iommu; 2085 int err; 2086 2087 if (map_perm & ~LDC_MAP_ALL) 2088 return -EINVAL; 2089 2090 err = sg_count_pages(sg, num_sg); 2091 if (err < 0) 2092 return err; 2093 2094 npages = err; 2095 if (err > ncookies) 2096 return -EMSGSIZE; 2097 2098 iommu = &lp->iommu; 2099 2100 spin_lock_irqsave(&iommu->lock, flags); 2101 base = alloc_npages(iommu, npages); 2102 spin_unlock_irqrestore(&iommu->lock, flags); 2103 2104 if (!base) 2105 return -ENOMEM; 2106 2107 state.page_table = iommu->page_table; 2108 state.cookies = cookies; 2109 state.mte_base = perm_to_mte(map_perm); 2110 state.prev_cookie = ~(u64)0; 2111 state.pte_idx = (base - iommu->page_table); 2112 state.nc = 0; 2113 2114 for (i = 0; i < num_sg; i++) 2115 fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT, 2116 sg[i].offset, sg[i].length); 2117 2118 return state.nc; 2119 } 2120 EXPORT_SYMBOL(ldc_map_sg); 2121 2122 int ldc_map_single(struct ldc_channel *lp, 2123 void *buf, unsigned int len, 2124 struct ldc_trans_cookie *cookies, int ncookies, 2125 unsigned int map_perm) 2126 { 2127 unsigned long npages, pa, flags; 2128 struct ldc_mtable_entry *base; 2129 struct cookie_state state; 2130 struct ldc_iommu *iommu; 2131 2132 if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) 2133 return -EINVAL; 2134 2135 pa = __pa(buf); 2136 if ((pa | len) & (8UL - 1)) 2137 return -EFAULT; 2138 2139 npages = pages_in_region(pa, len); 2140 2141 iommu = &lp->iommu; 2142 2143 spin_lock_irqsave(&iommu->lock, flags); 2144 base = alloc_npages(iommu, npages); 2145 spin_unlock_irqrestore(&iommu->lock, flags); 2146 2147 if (!base) 2148 return -ENOMEM; 2149 2150 state.page_table = iommu->page_table; 2151 state.cookies = cookies; 2152 state.mte_base = perm_to_mte(map_perm); 2153 state.prev_cookie = ~(u64)0; 2154 state.pte_idx = (base - iommu->page_table); 2155 state.nc = 0; 2156 fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); 2157 BUG_ON(state.nc != 1); 2158 2159 return state.nc; 2160 } 2161 EXPORT_SYMBOL(ldc_map_single); 2162 2163 static void free_npages(unsigned long id, struct ldc_iommu *iommu, 2164 u64 cookie, u64 size) 2165 { 2166 struct iommu_arena *arena = &iommu->arena; 2167 unsigned long i, shift, index, npages; 2168 struct ldc_mtable_entry *base; 2169 2170 npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; 2171 index = cookie_to_index(cookie, &shift); 2172 base = iommu->page_table + index; 2173 2174 BUG_ON(index > arena->limit || 2175 (index + npages) > arena->limit); 2176 2177 for (i = 0; i < npages; i++) { 2178 if (base->cookie) 2179 sun4v_ldc_revoke(id, cookie + (i << shift), 2180 base->cookie); 2181 base->mte = 0; 2182 __clear_bit(index + i, arena->map); 2183 } 2184 } 2185 2186 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, 2187 int ncookies) 2188 { 2189 struct ldc_iommu *iommu = &lp->iommu; 2190 unsigned long flags; 2191 int i; 2192 2193 spin_lock_irqsave(&iommu->lock, flags); 2194 for (i = 0; i < ncookies; i++) { 2195 u64 addr = cookies[i].cookie_addr; 2196 u64 size = cookies[i].cookie_size; 2197 2198 free_npages(lp->id, iommu, addr, size); 2199 } 2200 spin_unlock_irqrestore(&iommu->lock, flags); 2201 } 2202 EXPORT_SYMBOL(ldc_unmap); 2203 2204 int ldc_copy(struct ldc_channel *lp, int copy_dir, 2205 void *buf, unsigned int len, unsigned long offset, 2206 struct ldc_trans_cookie *cookies, int ncookies) 2207 { 2208 unsigned int orig_len; 2209 unsigned long ra; 2210 int i; 2211 2212 if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { 2213 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n", 2214 lp->id, copy_dir); 2215 return -EINVAL; 2216 } 2217 2218 ra = __pa(buf); 2219 if ((ra | len | offset) & (8UL - 1)) { 2220 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " 2221 "ra[%lx] len[%x] offset[%lx]\n", 2222 lp->id, ra, len, offset); 2223 return -EFAULT; 2224 } 2225 2226 if (lp->hs_state != LDC_HS_COMPLETE || 2227 (lp->flags & LDC_FLAG_RESET)) { 2228 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " 2229 "flags[%x]\n", lp->id, lp->hs_state, lp->flags); 2230 return -ECONNRESET; 2231 } 2232 2233 orig_len = len; 2234 for (i = 0; i < ncookies; i++) { 2235 unsigned long cookie_raddr = cookies[i].cookie_addr; 2236 unsigned long this_len = cookies[i].cookie_size; 2237 unsigned long actual_len; 2238 2239 if (unlikely(offset)) { 2240 unsigned long this_off = offset; 2241 2242 if (this_off > this_len) 2243 this_off = this_len; 2244 2245 offset -= this_off; 2246 this_len -= this_off; 2247 if (!this_len) 2248 continue; 2249 cookie_raddr += this_off; 2250 } 2251 2252 if (this_len > len) 2253 this_len = len; 2254 2255 while (1) { 2256 unsigned long hv_err; 2257 2258 hv_err = sun4v_ldc_copy(lp->id, copy_dir, 2259 cookie_raddr, ra, 2260 this_len, &actual_len); 2261 if (unlikely(hv_err)) { 2262 printk(KERN_ERR PFX "ldc_copy: ID[%lu] " 2263 "HV error %lu\n", 2264 lp->id, hv_err); 2265 if (lp->hs_state != LDC_HS_COMPLETE || 2266 (lp->flags & LDC_FLAG_RESET)) 2267 return -ECONNRESET; 2268 else 2269 return -EFAULT; 2270 } 2271 2272 cookie_raddr += actual_len; 2273 ra += actual_len; 2274 len -= actual_len; 2275 if (actual_len == this_len) 2276 break; 2277 2278 this_len -= actual_len; 2279 } 2280 2281 if (!len) 2282 break; 2283 } 2284 2285 /* It is caller policy what to do about short copies. 2286 * For example, a networking driver can declare the 2287 * packet a runt and drop it. 2288 */ 2289 2290 return orig_len - len; 2291 } 2292 EXPORT_SYMBOL(ldc_copy); 2293 2294 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, 2295 struct ldc_trans_cookie *cookies, int *ncookies, 2296 unsigned int map_perm) 2297 { 2298 void *buf; 2299 int err; 2300 2301 if (len & (8UL - 1)) 2302 return ERR_PTR(-EINVAL); 2303 2304 buf = kzalloc(len, GFP_KERNEL); 2305 if (!buf) 2306 return ERR_PTR(-ENOMEM); 2307 2308 err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); 2309 if (err < 0) { 2310 kfree(buf); 2311 return ERR_PTR(err); 2312 } 2313 *ncookies = err; 2314 2315 return buf; 2316 } 2317 EXPORT_SYMBOL(ldc_alloc_exp_dring); 2318 2319 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, 2320 struct ldc_trans_cookie *cookies, int ncookies) 2321 { 2322 ldc_unmap(lp, cookies, ncookies); 2323 kfree(buf); 2324 } 2325 EXPORT_SYMBOL(ldc_free_exp_dring); 2326 2327 static int __init ldc_init(void) 2328 { 2329 unsigned long major, minor; 2330 struct mdesc_handle *hp; 2331 const u64 *v; 2332 int err; 2333 u64 mp; 2334 2335 hp = mdesc_grab(); 2336 if (!hp) 2337 return -ENODEV; 2338 2339 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); 2340 err = -ENODEV; 2341 if (mp == MDESC_NODE_NULL) 2342 goto out; 2343 2344 v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); 2345 if (!v) 2346 goto out; 2347 2348 major = 1; 2349 minor = 0; 2350 if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { 2351 printk(KERN_INFO PFX "Could not register LDOM hvapi.\n"); 2352 goto out; 2353 } 2354 2355 printk(KERN_INFO "%s", version); 2356 2357 if (!*v) { 2358 printk(KERN_INFO PFX "Domaining disabled.\n"); 2359 goto out; 2360 } 2361 ldom_domaining_enabled = 1; 2362 err = 0; 2363 2364 out: 2365 mdesc_release(hp); 2366 return err; 2367 } 2368 2369 core_initcall(ldc_init); 2370