David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1 | /* ldc.c: Logical Domain Channel link-layer protocol driver. |
| 2 | * |
| 3 | * Copyright (C) 2007 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 | |
| 18 | #include <asm/hypervisor.h> |
| 19 | #include <asm/iommu.h> |
| 20 | #include <asm/page.h> |
| 21 | #include <asm/ldc.h> |
| 22 | #include <asm/mdesc.h> |
| 23 | |
| 24 | #define DRV_MODULE_NAME "ldc" |
| 25 | #define PFX DRV_MODULE_NAME ": " |
| 26 | #define DRV_MODULE_VERSION "1.0" |
| 27 | #define DRV_MODULE_RELDATE "June 25, 2007" |
| 28 | |
| 29 | static char version[] __devinitdata = |
| 30 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
| 31 | #define LDC_PACKET_SIZE 64 |
| 32 | |
| 33 | /* Packet header layout for unreliable and reliable mode frames. |
| 34 | * When in RAW mode, packets are simply straight 64-byte payloads |
| 35 | * with no headers. |
| 36 | */ |
| 37 | struct ldc_packet { |
| 38 | u8 type; |
| 39 | #define LDC_CTRL 0x01 |
| 40 | #define LDC_DATA 0x02 |
| 41 | #define LDC_ERR 0x10 |
| 42 | |
| 43 | u8 stype; |
| 44 | #define LDC_INFO 0x01 |
| 45 | #define LDC_ACK 0x02 |
| 46 | #define LDC_NACK 0x04 |
| 47 | |
| 48 | u8 ctrl; |
| 49 | #define LDC_VERS 0x01 /* Link Version */ |
| 50 | #define LDC_RTS 0x02 /* Request To Send */ |
| 51 | #define LDC_RTR 0x03 /* Ready To Receive */ |
| 52 | #define LDC_RDX 0x04 /* Ready for Data eXchange */ |
| 53 | #define LDC_CTRL_MSK 0x0f |
| 54 | |
| 55 | u8 env; |
| 56 | #define LDC_LEN 0x3f |
| 57 | #define LDC_FRAG_MASK 0xc0 |
| 58 | #define LDC_START 0x40 |
| 59 | #define LDC_STOP 0x80 |
| 60 | |
| 61 | u32 seqid; |
| 62 | |
| 63 | union { |
| 64 | u8 u_data[LDC_PACKET_SIZE - 8]; |
| 65 | struct { |
| 66 | u32 pad; |
| 67 | u32 ackid; |
| 68 | u8 r_data[LDC_PACKET_SIZE - 8 - 8]; |
| 69 | } r; |
| 70 | } u; |
| 71 | }; |
| 72 | |
| 73 | struct ldc_version { |
| 74 | u16 major; |
| 75 | u16 minor; |
| 76 | }; |
| 77 | |
| 78 | /* Ordered from largest major to lowest. */ |
| 79 | static struct ldc_version ver_arr[] = { |
| 80 | { .major = 1, .minor = 0 }, |
| 81 | }; |
| 82 | |
| 83 | #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE) |
| 84 | #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE) |
| 85 | |
| 86 | struct ldc_channel; |
| 87 | |
| 88 | struct ldc_mode_ops { |
| 89 | int (*write)(struct ldc_channel *, const void *, unsigned int); |
| 90 | int (*read)(struct ldc_channel *, void *, unsigned int); |
| 91 | }; |
| 92 | |
| 93 | static const struct ldc_mode_ops raw_ops; |
| 94 | static const struct ldc_mode_ops nonraw_ops; |
| 95 | static const struct ldc_mode_ops stream_ops; |
| 96 | |
| 97 | int ldom_domaining_enabled; |
| 98 | |
| 99 | struct ldc_iommu { |
| 100 | /* Protects arena alloc/free. */ |
| 101 | spinlock_t lock; |
| 102 | struct iommu_arena arena; |
| 103 | struct ldc_mtable_entry *page_table; |
| 104 | }; |
| 105 | |
| 106 | struct ldc_channel { |
| 107 | /* Protects all operations that depend upon channel state. */ |
| 108 | spinlock_t lock; |
| 109 | |
| 110 | unsigned long id; |
| 111 | |
| 112 | u8 *mssbuf; |
| 113 | u32 mssbuf_len; |
| 114 | u32 mssbuf_off; |
| 115 | |
| 116 | struct ldc_packet *tx_base; |
| 117 | unsigned long tx_head; |
| 118 | unsigned long tx_tail; |
| 119 | unsigned long tx_num_entries; |
| 120 | unsigned long tx_ra; |
| 121 | |
| 122 | unsigned long tx_acked; |
| 123 | |
| 124 | struct ldc_packet *rx_base; |
| 125 | unsigned long rx_head; |
| 126 | unsigned long rx_tail; |
| 127 | unsigned long rx_num_entries; |
| 128 | unsigned long rx_ra; |
| 129 | |
| 130 | u32 rcv_nxt; |
| 131 | u32 snd_nxt; |
| 132 | |
| 133 | unsigned long chan_state; |
| 134 | |
| 135 | struct ldc_channel_config cfg; |
| 136 | void *event_arg; |
| 137 | |
| 138 | const struct ldc_mode_ops *mops; |
| 139 | |
| 140 | struct ldc_iommu iommu; |
| 141 | |
| 142 | struct ldc_version ver; |
| 143 | |
| 144 | u8 hs_state; |
| 145 | #define LDC_HS_CLOSED 0x00 |
| 146 | #define LDC_HS_OPEN 0x01 |
| 147 | #define LDC_HS_GOTVERS 0x02 |
| 148 | #define LDC_HS_SENTRTR 0x03 |
| 149 | #define LDC_HS_GOTRTR 0x04 |
| 150 | #define LDC_HS_COMPLETE 0x10 |
| 151 | |
| 152 | u8 flags; |
| 153 | #define LDC_FLAG_ALLOCED_QUEUES 0x01 |
| 154 | #define LDC_FLAG_REGISTERED_QUEUES 0x02 |
| 155 | #define LDC_FLAG_REGISTERED_IRQS 0x04 |
| 156 | #define LDC_FLAG_RESET 0x10 |
| 157 | |
| 158 | u8 mss; |
| 159 | u8 state; |
| 160 | |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 161 | #define LDC_IRQ_NAME_MAX 32 |
| 162 | char rx_irq_name[LDC_IRQ_NAME_MAX]; |
| 163 | char tx_irq_name[LDC_IRQ_NAME_MAX]; |
| 164 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 165 | struct hlist_head mh_list; |
| 166 | |
| 167 | struct hlist_node list; |
| 168 | }; |
| 169 | |
| 170 | #define ldcdbg(TYPE, f, a...) \ |
| 171 | do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \ |
| 172 | printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \ |
| 173 | } while (0) |
| 174 | |
| 175 | static const char *state_to_str(u8 state) |
| 176 | { |
| 177 | switch (state) { |
| 178 | case LDC_STATE_INVALID: |
| 179 | return "INVALID"; |
| 180 | case LDC_STATE_INIT: |
| 181 | return "INIT"; |
| 182 | case LDC_STATE_BOUND: |
| 183 | return "BOUND"; |
| 184 | case LDC_STATE_READY: |
| 185 | return "READY"; |
| 186 | case LDC_STATE_CONNECTED: |
| 187 | return "CONNECTED"; |
| 188 | default: |
| 189 | return "<UNKNOWN>"; |
| 190 | } |
| 191 | } |
| 192 | |
| 193 | static void ldc_set_state(struct ldc_channel *lp, u8 state) |
| 194 | { |
| 195 | ldcdbg(STATE, "STATE (%s) --> (%s)\n", |
| 196 | state_to_str(lp->state), |
| 197 | state_to_str(state)); |
| 198 | |
| 199 | lp->state = state; |
| 200 | } |
| 201 | |
| 202 | static unsigned long __advance(unsigned long off, unsigned long num_entries) |
| 203 | { |
| 204 | off += LDC_PACKET_SIZE; |
| 205 | if (off == (num_entries * LDC_PACKET_SIZE)) |
| 206 | off = 0; |
| 207 | |
| 208 | return off; |
| 209 | } |
| 210 | |
| 211 | static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off) |
| 212 | { |
| 213 | return __advance(off, lp->rx_num_entries); |
| 214 | } |
| 215 | |
| 216 | static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off) |
| 217 | { |
| 218 | return __advance(off, lp->tx_num_entries); |
| 219 | } |
| 220 | |
| 221 | static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp, |
| 222 | unsigned long *new_tail) |
| 223 | { |
| 224 | struct ldc_packet *p; |
| 225 | unsigned long t; |
| 226 | |
| 227 | t = tx_advance(lp, lp->tx_tail); |
| 228 | if (t == lp->tx_head) |
| 229 | return NULL; |
| 230 | |
| 231 | *new_tail = t; |
| 232 | |
| 233 | p = lp->tx_base; |
| 234 | return p + (lp->tx_tail / LDC_PACKET_SIZE); |
| 235 | } |
| 236 | |
| 237 | /* When we are in reliable or stream mode, have to track the next packet |
| 238 | * we haven't gotten an ACK for in the TX queue using tx_acked. We have |
| 239 | * to be careful not to stomp over the queue past that point. During |
| 240 | * the handshake, we don't have TX data packets pending in the queue |
| 241 | * and that's why handshake_get_tx_packet() need not be mindful of |
| 242 | * lp->tx_acked. |
| 243 | */ |
| 244 | static unsigned long head_for_data(struct ldc_channel *lp) |
| 245 | { |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 246 | if (lp->cfg.mode == LDC_MODE_STREAM) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 247 | return lp->tx_acked; |
| 248 | return lp->tx_head; |
| 249 | } |
| 250 | |
| 251 | static int tx_has_space_for(struct ldc_channel *lp, unsigned int size) |
| 252 | { |
| 253 | unsigned long limit, tail, new_tail, diff; |
| 254 | unsigned int mss; |
| 255 | |
| 256 | limit = head_for_data(lp); |
| 257 | tail = lp->tx_tail; |
| 258 | new_tail = tx_advance(lp, tail); |
| 259 | if (new_tail == limit) |
| 260 | return 0; |
| 261 | |
| 262 | if (limit > new_tail) |
| 263 | diff = limit - new_tail; |
| 264 | else |
| 265 | diff = (limit + |
| 266 | ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail)); |
| 267 | diff /= LDC_PACKET_SIZE; |
| 268 | mss = lp->mss; |
| 269 | |
| 270 | if (diff * mss < size) |
| 271 | return 0; |
| 272 | |
| 273 | return 1; |
| 274 | } |
| 275 | |
| 276 | static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp, |
| 277 | unsigned long *new_tail) |
| 278 | { |
| 279 | struct ldc_packet *p; |
| 280 | unsigned long h, t; |
| 281 | |
| 282 | h = head_for_data(lp); |
| 283 | t = tx_advance(lp, lp->tx_tail); |
| 284 | if (t == h) |
| 285 | return NULL; |
| 286 | |
| 287 | *new_tail = t; |
| 288 | |
| 289 | p = lp->tx_base; |
| 290 | return p + (lp->tx_tail / LDC_PACKET_SIZE); |
| 291 | } |
| 292 | |
| 293 | static int set_tx_tail(struct ldc_channel *lp, unsigned long tail) |
| 294 | { |
| 295 | unsigned long orig_tail = lp->tx_tail; |
| 296 | int limit = 1000; |
| 297 | |
| 298 | lp->tx_tail = tail; |
| 299 | while (limit-- > 0) { |
| 300 | unsigned long err; |
| 301 | |
| 302 | err = sun4v_ldc_tx_set_qtail(lp->id, tail); |
| 303 | if (!err) |
| 304 | return 0; |
| 305 | |
| 306 | if (err != HV_EWOULDBLOCK) { |
| 307 | lp->tx_tail = orig_tail; |
| 308 | return -EINVAL; |
| 309 | } |
| 310 | udelay(1); |
| 311 | } |
| 312 | |
| 313 | lp->tx_tail = orig_tail; |
| 314 | return -EBUSY; |
| 315 | } |
| 316 | |
| 317 | /* This just updates the head value in the hypervisor using |
| 318 | * a polling loop with a timeout. The caller takes care of |
| 319 | * upating software state representing the head change, if any. |
| 320 | */ |
| 321 | static int __set_rx_head(struct ldc_channel *lp, unsigned long head) |
| 322 | { |
| 323 | int limit = 1000; |
| 324 | |
| 325 | while (limit-- > 0) { |
| 326 | unsigned long err; |
| 327 | |
| 328 | err = sun4v_ldc_rx_set_qhead(lp->id, head); |
| 329 | if (!err) |
| 330 | return 0; |
| 331 | |
| 332 | if (err != HV_EWOULDBLOCK) |
| 333 | return -EINVAL; |
| 334 | |
| 335 | udelay(1); |
| 336 | } |
| 337 | |
| 338 | return -EBUSY; |
| 339 | } |
| 340 | |
| 341 | static int send_tx_packet(struct ldc_channel *lp, |
| 342 | struct ldc_packet *p, |
| 343 | unsigned long new_tail) |
| 344 | { |
| 345 | BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE))); |
| 346 | |
| 347 | return set_tx_tail(lp, new_tail); |
| 348 | } |
| 349 | |
| 350 | static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp, |
| 351 | u8 stype, u8 ctrl, |
| 352 | void *data, int dlen, |
| 353 | unsigned long *new_tail) |
| 354 | { |
| 355 | struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail); |
| 356 | |
| 357 | if (p) { |
| 358 | memset(p, 0, sizeof(*p)); |
| 359 | p->type = LDC_CTRL; |
| 360 | p->stype = stype; |
| 361 | p->ctrl = ctrl; |
| 362 | if (data) |
| 363 | memcpy(p->u.u_data, data, dlen); |
| 364 | } |
| 365 | return p; |
| 366 | } |
| 367 | |
| 368 | static int start_handshake(struct ldc_channel *lp) |
| 369 | { |
| 370 | struct ldc_packet *p; |
| 371 | struct ldc_version *ver; |
| 372 | unsigned long new_tail; |
| 373 | |
| 374 | ver = &ver_arr[0]; |
| 375 | |
| 376 | ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n", |
| 377 | ver->major, ver->minor); |
| 378 | |
| 379 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
| 380 | ver, sizeof(*ver), &new_tail); |
| 381 | if (p) { |
| 382 | int err = send_tx_packet(lp, p, new_tail); |
| 383 | if (!err) |
| 384 | lp->flags &= ~LDC_FLAG_RESET; |
| 385 | return err; |
| 386 | } |
| 387 | return -EBUSY; |
| 388 | } |
| 389 | |
| 390 | static int send_version_nack(struct ldc_channel *lp, |
| 391 | u16 major, u16 minor) |
| 392 | { |
| 393 | struct ldc_packet *p; |
| 394 | struct ldc_version ver; |
| 395 | unsigned long new_tail; |
| 396 | |
| 397 | ver.major = major; |
| 398 | ver.minor = minor; |
| 399 | |
| 400 | p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS, |
| 401 | &ver, sizeof(ver), &new_tail); |
| 402 | if (p) { |
| 403 | ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n", |
| 404 | ver.major, ver.minor); |
| 405 | |
| 406 | return send_tx_packet(lp, p, new_tail); |
| 407 | } |
| 408 | return -EBUSY; |
| 409 | } |
| 410 | |
| 411 | static int send_version_ack(struct ldc_channel *lp, |
| 412 | struct ldc_version *vp) |
| 413 | { |
| 414 | struct ldc_packet *p; |
| 415 | unsigned long new_tail; |
| 416 | |
| 417 | p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS, |
| 418 | vp, sizeof(*vp), &new_tail); |
| 419 | if (p) { |
| 420 | ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n", |
| 421 | vp->major, vp->minor); |
| 422 | |
| 423 | return send_tx_packet(lp, p, new_tail); |
| 424 | } |
| 425 | return -EBUSY; |
| 426 | } |
| 427 | |
| 428 | static int send_rts(struct ldc_channel *lp) |
| 429 | { |
| 430 | struct ldc_packet *p; |
| 431 | unsigned long new_tail; |
| 432 | |
| 433 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0, |
| 434 | &new_tail); |
| 435 | if (p) { |
| 436 | p->env = lp->cfg.mode; |
| 437 | p->seqid = 0; |
| 438 | lp->rcv_nxt = 0; |
| 439 | |
| 440 | ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n", |
| 441 | p->env, p->seqid); |
| 442 | |
| 443 | return send_tx_packet(lp, p, new_tail); |
| 444 | } |
| 445 | return -EBUSY; |
| 446 | } |
| 447 | |
| 448 | static int send_rtr(struct ldc_channel *lp) |
| 449 | { |
| 450 | struct ldc_packet *p; |
| 451 | unsigned long new_tail; |
| 452 | |
| 453 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0, |
| 454 | &new_tail); |
| 455 | if (p) { |
| 456 | p->env = lp->cfg.mode; |
| 457 | p->seqid = 0; |
| 458 | |
| 459 | ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n", |
| 460 | p->env, p->seqid); |
| 461 | |
| 462 | return send_tx_packet(lp, p, new_tail); |
| 463 | } |
| 464 | return -EBUSY; |
| 465 | } |
| 466 | |
| 467 | static int send_rdx(struct ldc_channel *lp) |
| 468 | { |
| 469 | struct ldc_packet *p; |
| 470 | unsigned long new_tail; |
| 471 | |
| 472 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0, |
| 473 | &new_tail); |
| 474 | if (p) { |
| 475 | p->env = 0; |
| 476 | p->seqid = ++lp->snd_nxt; |
| 477 | p->u.r.ackid = lp->rcv_nxt; |
| 478 | |
| 479 | ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n", |
| 480 | p->env, p->seqid, p->u.r.ackid); |
| 481 | |
| 482 | return send_tx_packet(lp, p, new_tail); |
| 483 | } |
| 484 | return -EBUSY; |
| 485 | } |
| 486 | |
| 487 | static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt) |
| 488 | { |
| 489 | struct ldc_packet *p; |
| 490 | unsigned long new_tail; |
| 491 | int err; |
| 492 | |
| 493 | p = data_get_tx_packet(lp, &new_tail); |
| 494 | if (!p) |
| 495 | return -EBUSY; |
| 496 | memset(p, 0, sizeof(*p)); |
| 497 | p->type = data_pkt->type; |
| 498 | p->stype = LDC_NACK; |
| 499 | p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK; |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 500 | p->seqid = lp->snd_nxt + 1; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 501 | p->u.r.ackid = lp->rcv_nxt; |
| 502 | |
| 503 | ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n", |
| 504 | p->type, p->ctrl, p->seqid, p->u.r.ackid); |
| 505 | |
| 506 | err = send_tx_packet(lp, p, new_tail); |
| 507 | if (!err) |
| 508 | lp->snd_nxt++; |
| 509 | |
| 510 | return err; |
| 511 | } |
| 512 | |
| 513 | static int ldc_abort(struct ldc_channel *lp) |
| 514 | { |
| 515 | unsigned long hv_err; |
| 516 | |
| 517 | ldcdbg(STATE, "ABORT\n"); |
| 518 | |
| 519 | /* We report but do not act upon the hypervisor errors because |
| 520 | * there really isn't much we can do if they fail at this point. |
| 521 | */ |
| 522 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
| 523 | if (hv_err) |
| 524 | printk(KERN_ERR PFX "ldc_abort: " |
| 525 | "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n", |
| 526 | lp->id, lp->tx_ra, lp->tx_num_entries, hv_err); |
| 527 | |
| 528 | hv_err = sun4v_ldc_tx_get_state(lp->id, |
| 529 | &lp->tx_head, |
| 530 | &lp->tx_tail, |
| 531 | &lp->chan_state); |
| 532 | if (hv_err) |
| 533 | printk(KERN_ERR PFX "ldc_abort: " |
| 534 | "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n", |
| 535 | lp->id, hv_err); |
| 536 | |
| 537 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
| 538 | if (hv_err) |
| 539 | printk(KERN_ERR PFX "ldc_abort: " |
| 540 | "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n", |
| 541 | lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); |
| 542 | |
| 543 | /* Refetch the RX queue state as well, because we could be invoked |
| 544 | * here in the queue processing context. |
| 545 | */ |
| 546 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
| 547 | &lp->rx_head, |
| 548 | &lp->rx_tail, |
| 549 | &lp->chan_state); |
| 550 | if (hv_err) |
| 551 | printk(KERN_ERR PFX "ldc_abort: " |
| 552 | "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n", |
| 553 | lp->id, hv_err); |
| 554 | |
| 555 | return -ECONNRESET; |
| 556 | } |
| 557 | |
| 558 | static struct ldc_version *find_by_major(u16 major) |
| 559 | { |
| 560 | struct ldc_version *ret = NULL; |
| 561 | int i; |
| 562 | |
| 563 | for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { |
| 564 | struct ldc_version *v = &ver_arr[i]; |
| 565 | if (v->major <= major) { |
| 566 | ret = v; |
| 567 | break; |
| 568 | } |
| 569 | } |
| 570 | return ret; |
| 571 | } |
| 572 | |
| 573 | static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) |
| 574 | { |
| 575 | struct ldc_version *vap; |
| 576 | int err; |
| 577 | |
| 578 | ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n", |
| 579 | vp->major, vp->minor); |
| 580 | |
| 581 | if (lp->hs_state == LDC_HS_GOTVERS) { |
| 582 | lp->hs_state = LDC_HS_OPEN; |
| 583 | memset(&lp->ver, 0, sizeof(lp->ver)); |
| 584 | } |
| 585 | |
| 586 | vap = find_by_major(vp->major); |
| 587 | if (!vap) { |
| 588 | err = send_version_nack(lp, 0, 0); |
| 589 | } else if (vap->major != vp->major) { |
| 590 | err = send_version_nack(lp, vap->major, vap->minor); |
| 591 | } else { |
| 592 | struct ldc_version ver = *vp; |
| 593 | if (ver.minor > vap->minor) |
| 594 | ver.minor = vap->minor; |
| 595 | err = send_version_ack(lp, &ver); |
| 596 | if (!err) { |
| 597 | lp->ver = ver; |
| 598 | lp->hs_state = LDC_HS_GOTVERS; |
| 599 | } |
| 600 | } |
| 601 | if (err) |
| 602 | return ldc_abort(lp); |
| 603 | |
| 604 | return 0; |
| 605 | } |
| 606 | |
| 607 | static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp) |
| 608 | { |
| 609 | ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n", |
| 610 | vp->major, vp->minor); |
| 611 | |
| 612 | if (lp->hs_state == LDC_HS_GOTVERS) { |
| 613 | if (lp->ver.major != vp->major || |
| 614 | lp->ver.minor != vp->minor) |
| 615 | return ldc_abort(lp); |
| 616 | } else { |
| 617 | lp->ver = *vp; |
| 618 | lp->hs_state = LDC_HS_GOTVERS; |
| 619 | } |
| 620 | if (send_rts(lp)) |
| 621 | return ldc_abort(lp); |
| 622 | return 0; |
| 623 | } |
| 624 | |
| 625 | static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp) |
| 626 | { |
| 627 | struct ldc_version *vap; |
| 628 | |
| 629 | if ((vp->major == 0 && vp->minor == 0) || |
| 630 | !(vap = find_by_major(vp->major))) { |
| 631 | return ldc_abort(lp); |
| 632 | } else { |
| 633 | struct ldc_packet *p; |
| 634 | unsigned long new_tail; |
| 635 | |
| 636 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
| 637 | vap, sizeof(*vap), |
| 638 | &new_tail); |
| 639 | if (p) |
| 640 | return send_tx_packet(lp, p, new_tail); |
| 641 | else |
| 642 | return ldc_abort(lp); |
| 643 | } |
| 644 | } |
| 645 | |
| 646 | static int process_version(struct ldc_channel *lp, |
| 647 | struct ldc_packet *p) |
| 648 | { |
| 649 | struct ldc_version *vp; |
| 650 | |
| 651 | vp = (struct ldc_version *) p->u.u_data; |
| 652 | |
| 653 | switch (p->stype) { |
| 654 | case LDC_INFO: |
| 655 | return process_ver_info(lp, vp); |
| 656 | |
| 657 | case LDC_ACK: |
| 658 | return process_ver_ack(lp, vp); |
| 659 | |
| 660 | case LDC_NACK: |
| 661 | return process_ver_nack(lp, vp); |
| 662 | |
| 663 | default: |
| 664 | return ldc_abort(lp); |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | static int process_rts(struct ldc_channel *lp, |
| 669 | struct ldc_packet *p) |
| 670 | { |
| 671 | ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n", |
| 672 | p->stype, p->seqid, p->env); |
| 673 | |
| 674 | if (p->stype != LDC_INFO || |
| 675 | lp->hs_state != LDC_HS_GOTVERS || |
| 676 | p->env != lp->cfg.mode) |
| 677 | return ldc_abort(lp); |
| 678 | |
| 679 | lp->snd_nxt = p->seqid; |
| 680 | lp->rcv_nxt = p->seqid; |
| 681 | lp->hs_state = LDC_HS_SENTRTR; |
| 682 | if (send_rtr(lp)) |
| 683 | return ldc_abort(lp); |
| 684 | |
| 685 | return 0; |
| 686 | } |
| 687 | |
| 688 | static int process_rtr(struct ldc_channel *lp, |
| 689 | struct ldc_packet *p) |
| 690 | { |
| 691 | ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n", |
| 692 | p->stype, p->seqid, p->env); |
| 693 | |
| 694 | if (p->stype != LDC_INFO || |
| 695 | p->env != lp->cfg.mode) |
| 696 | return ldc_abort(lp); |
| 697 | |
| 698 | lp->snd_nxt = p->seqid; |
| 699 | lp->hs_state = LDC_HS_COMPLETE; |
| 700 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
| 701 | send_rdx(lp); |
| 702 | |
| 703 | return LDC_EVENT_UP; |
| 704 | } |
| 705 | |
| 706 | static int rx_seq_ok(struct ldc_channel *lp, u32 seqid) |
| 707 | { |
| 708 | return lp->rcv_nxt + 1 == seqid; |
| 709 | } |
| 710 | |
| 711 | static int process_rdx(struct ldc_channel *lp, |
| 712 | struct ldc_packet *p) |
| 713 | { |
| 714 | ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n", |
| 715 | p->stype, p->seqid, p->env, p->u.r.ackid); |
| 716 | |
| 717 | if (p->stype != LDC_INFO || |
| 718 | !(rx_seq_ok(lp, p->seqid))) |
| 719 | return ldc_abort(lp); |
| 720 | |
| 721 | lp->rcv_nxt = p->seqid; |
| 722 | |
| 723 | lp->hs_state = LDC_HS_COMPLETE; |
| 724 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
| 725 | |
| 726 | return LDC_EVENT_UP; |
| 727 | } |
| 728 | |
| 729 | static int process_control_frame(struct ldc_channel *lp, |
| 730 | struct ldc_packet *p) |
| 731 | { |
| 732 | switch (p->ctrl) { |
| 733 | case LDC_VERS: |
| 734 | return process_version(lp, p); |
| 735 | |
| 736 | case LDC_RTS: |
| 737 | return process_rts(lp, p); |
| 738 | |
| 739 | case LDC_RTR: |
| 740 | return process_rtr(lp, p); |
| 741 | |
| 742 | case LDC_RDX: |
| 743 | return process_rdx(lp, p); |
| 744 | |
| 745 | default: |
| 746 | return ldc_abort(lp); |
| 747 | } |
| 748 | } |
| 749 | |
| 750 | static int process_error_frame(struct ldc_channel *lp, |
| 751 | struct ldc_packet *p) |
| 752 | { |
| 753 | return ldc_abort(lp); |
| 754 | } |
| 755 | |
| 756 | static int process_data_ack(struct ldc_channel *lp, |
| 757 | struct ldc_packet *ack) |
| 758 | { |
| 759 | unsigned long head = lp->tx_acked; |
| 760 | u32 ackid = ack->u.r.ackid; |
| 761 | |
| 762 | while (1) { |
| 763 | struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE); |
| 764 | |
| 765 | head = tx_advance(lp, head); |
| 766 | |
| 767 | if (p->seqid == ackid) { |
| 768 | lp->tx_acked = head; |
| 769 | return 0; |
| 770 | } |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 771 | if (head == lp->tx_tail) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 772 | return ldc_abort(lp); |
| 773 | } |
| 774 | |
| 775 | return 0; |
| 776 | } |
| 777 | |
| 778 | static void send_events(struct ldc_channel *lp, unsigned int event_mask) |
| 779 | { |
| 780 | if (event_mask & LDC_EVENT_RESET) |
| 781 | lp->cfg.event(lp->event_arg, LDC_EVENT_RESET); |
| 782 | if (event_mask & LDC_EVENT_UP) |
| 783 | lp->cfg.event(lp->event_arg, LDC_EVENT_UP); |
| 784 | if (event_mask & LDC_EVENT_DATA_READY) |
| 785 | lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY); |
| 786 | } |
| 787 | |
| 788 | static irqreturn_t ldc_rx(int irq, void *dev_id) |
| 789 | { |
| 790 | struct ldc_channel *lp = dev_id; |
| 791 | unsigned long orig_state, hv_err, flags; |
| 792 | unsigned int event_mask; |
| 793 | |
| 794 | spin_lock_irqsave(&lp->lock, flags); |
| 795 | |
| 796 | orig_state = lp->chan_state; |
| 797 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
| 798 | &lp->rx_head, |
| 799 | &lp->rx_tail, |
| 800 | &lp->chan_state); |
| 801 | |
| 802 | ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", |
| 803 | orig_state, lp->chan_state, lp->rx_head, lp->rx_tail); |
| 804 | |
| 805 | event_mask = 0; |
| 806 | |
| 807 | if (lp->cfg.mode == LDC_MODE_RAW && |
| 808 | lp->chan_state == LDC_CHANNEL_UP) { |
| 809 | lp->hs_state = LDC_HS_COMPLETE; |
| 810 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
| 811 | |
| 812 | event_mask |= LDC_EVENT_UP; |
| 813 | |
| 814 | orig_state = lp->chan_state; |
| 815 | } |
| 816 | |
| 817 | /* If we are in reset state, flush the RX queue and ignore |
| 818 | * everything. |
| 819 | */ |
| 820 | if (lp->flags & LDC_FLAG_RESET) { |
| 821 | (void) __set_rx_head(lp, lp->rx_tail); |
| 822 | goto out; |
| 823 | } |
| 824 | |
| 825 | /* Once we finish the handshake, we let the ldc_read() |
| 826 | * paths do all of the control frame and state management. |
| 827 | * Just trigger the callback. |
| 828 | */ |
| 829 | if (lp->hs_state == LDC_HS_COMPLETE) { |
| 830 | handshake_complete: |
| 831 | if (lp->chan_state != orig_state) { |
| 832 | unsigned int event = LDC_EVENT_RESET; |
| 833 | |
| 834 | if (lp->chan_state == LDC_CHANNEL_UP) |
| 835 | event = LDC_EVENT_UP; |
| 836 | |
| 837 | event_mask |= event; |
| 838 | } |
| 839 | if (lp->rx_head != lp->rx_tail) |
| 840 | event_mask |= LDC_EVENT_DATA_READY; |
| 841 | |
| 842 | goto out; |
| 843 | } |
| 844 | |
| 845 | if (lp->chan_state != orig_state) |
| 846 | goto out; |
| 847 | |
| 848 | while (lp->rx_head != lp->rx_tail) { |
| 849 | struct ldc_packet *p; |
| 850 | unsigned long new; |
| 851 | int err; |
| 852 | |
| 853 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); |
| 854 | |
| 855 | switch (p->type) { |
| 856 | case LDC_CTRL: |
| 857 | err = process_control_frame(lp, p); |
| 858 | if (err > 0) |
| 859 | event_mask |= err; |
| 860 | break; |
| 861 | |
| 862 | case LDC_DATA: |
| 863 | event_mask |= LDC_EVENT_DATA_READY; |
| 864 | err = 0; |
| 865 | break; |
| 866 | |
| 867 | case LDC_ERR: |
| 868 | err = process_error_frame(lp, p); |
| 869 | break; |
| 870 | |
| 871 | default: |
| 872 | err = ldc_abort(lp); |
| 873 | break; |
| 874 | } |
| 875 | |
| 876 | if (err < 0) |
| 877 | break; |
| 878 | |
| 879 | new = lp->rx_head; |
| 880 | new += LDC_PACKET_SIZE; |
| 881 | if (new == (lp->rx_num_entries * LDC_PACKET_SIZE)) |
| 882 | new = 0; |
| 883 | lp->rx_head = new; |
| 884 | |
| 885 | err = __set_rx_head(lp, new); |
| 886 | if (err < 0) { |
| 887 | (void) ldc_abort(lp); |
| 888 | break; |
| 889 | } |
| 890 | if (lp->hs_state == LDC_HS_COMPLETE) |
| 891 | goto handshake_complete; |
| 892 | } |
| 893 | |
| 894 | out: |
| 895 | spin_unlock_irqrestore(&lp->lock, flags); |
| 896 | |
| 897 | send_events(lp, event_mask); |
| 898 | |
| 899 | return IRQ_HANDLED; |
| 900 | } |
| 901 | |
| 902 | static irqreturn_t ldc_tx(int irq, void *dev_id) |
| 903 | { |
| 904 | struct ldc_channel *lp = dev_id; |
| 905 | unsigned long flags, hv_err, orig_state; |
| 906 | unsigned int event_mask = 0; |
| 907 | |
| 908 | spin_lock_irqsave(&lp->lock, flags); |
| 909 | |
| 910 | orig_state = lp->chan_state; |
| 911 | hv_err = sun4v_ldc_tx_get_state(lp->id, |
| 912 | &lp->tx_head, |
| 913 | &lp->tx_tail, |
| 914 | &lp->chan_state); |
| 915 | |
| 916 | ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", |
| 917 | orig_state, lp->chan_state, lp->tx_head, lp->tx_tail); |
| 918 | |
| 919 | if (lp->cfg.mode == LDC_MODE_RAW && |
| 920 | lp->chan_state == LDC_CHANNEL_UP) { |
| 921 | lp->hs_state = LDC_HS_COMPLETE; |
| 922 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
| 923 | |
| 924 | event_mask |= LDC_EVENT_UP; |
| 925 | } |
| 926 | |
| 927 | spin_unlock_irqrestore(&lp->lock, flags); |
| 928 | |
| 929 | send_events(lp, event_mask); |
| 930 | |
| 931 | return IRQ_HANDLED; |
| 932 | } |
| 933 | |
| 934 | /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so |
| 935 | * XXX that addition and removal from the ldc_channel_list has |
| 936 | * XXX atomicity, otherwise the __ldc_channel_exists() check is |
| 937 | * XXX totally pointless as another thread can slip into ldc_alloc() |
| 938 | * XXX and add a channel with the same ID. There also needs to be |
| 939 | * XXX a spinlock for ldc_channel_list. |
| 940 | */ |
| 941 | static HLIST_HEAD(ldc_channel_list); |
| 942 | |
| 943 | static int __ldc_channel_exists(unsigned long id) |
| 944 | { |
| 945 | struct ldc_channel *lp; |
| 946 | struct hlist_node *n; |
| 947 | |
| 948 | hlist_for_each_entry(lp, n, &ldc_channel_list, list) { |
| 949 | if (lp->id == id) |
| 950 | return 1; |
| 951 | } |
| 952 | return 0; |
| 953 | } |
| 954 | |
| 955 | static int alloc_queue(const char *name, unsigned long num_entries, |
| 956 | struct ldc_packet **base, unsigned long *ra) |
| 957 | { |
| 958 | unsigned long size, order; |
| 959 | void *q; |
| 960 | |
| 961 | size = num_entries * LDC_PACKET_SIZE; |
| 962 | order = get_order(size); |
| 963 | |
| 964 | q = (void *) __get_free_pages(GFP_KERNEL, order); |
| 965 | if (!q) { |
| 966 | printk(KERN_ERR PFX "Alloc of %s queue failed with " |
| 967 | "size=%lu order=%lu\n", name, size, order); |
| 968 | return -ENOMEM; |
| 969 | } |
| 970 | |
| 971 | memset(q, 0, PAGE_SIZE << order); |
| 972 | |
| 973 | *base = q; |
| 974 | *ra = __pa(q); |
| 975 | |
| 976 | return 0; |
| 977 | } |
| 978 | |
| 979 | static void free_queue(unsigned long num_entries, struct ldc_packet *q) |
| 980 | { |
| 981 | unsigned long size, order; |
| 982 | |
| 983 | if (!q) |
| 984 | return; |
| 985 | |
| 986 | size = num_entries * LDC_PACKET_SIZE; |
| 987 | order = get_order(size); |
| 988 | |
| 989 | free_pages((unsigned long)q, order); |
| 990 | } |
| 991 | |
| 992 | /* XXX Make this configurable... XXX */ |
| 993 | #define LDC_IOTABLE_SIZE (8 * 1024) |
| 994 | |
| 995 | static int ldc_iommu_init(struct ldc_channel *lp) |
| 996 | { |
| 997 | unsigned long sz, num_tsb_entries, tsbsize, order; |
| 998 | struct ldc_iommu *iommu = &lp->iommu; |
| 999 | struct ldc_mtable_entry *table; |
| 1000 | unsigned long hv_err; |
| 1001 | int err; |
| 1002 | |
| 1003 | num_tsb_entries = LDC_IOTABLE_SIZE; |
| 1004 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
| 1005 | |
| 1006 | spin_lock_init(&iommu->lock); |
| 1007 | |
| 1008 | sz = num_tsb_entries / 8; |
| 1009 | sz = (sz + 7UL) & ~7UL; |
| 1010 | iommu->arena.map = kzalloc(sz, GFP_KERNEL); |
| 1011 | if (!iommu->arena.map) { |
| 1012 | printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); |
| 1013 | return -ENOMEM; |
| 1014 | } |
| 1015 | |
| 1016 | iommu->arena.limit = num_tsb_entries; |
| 1017 | |
| 1018 | order = get_order(tsbsize); |
| 1019 | |
| 1020 | table = (struct ldc_mtable_entry *) |
| 1021 | __get_free_pages(GFP_KERNEL, order); |
| 1022 | err = -ENOMEM; |
| 1023 | if (!table) { |
| 1024 | printk(KERN_ERR PFX "Alloc of MTE table failed, " |
| 1025 | "size=%lu order=%lu\n", tsbsize, order); |
| 1026 | goto out_free_map; |
| 1027 | } |
| 1028 | |
| 1029 | memset(table, 0, PAGE_SIZE << order); |
| 1030 | |
| 1031 | iommu->page_table = table; |
| 1032 | |
| 1033 | hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), |
| 1034 | num_tsb_entries); |
| 1035 | err = -EINVAL; |
| 1036 | if (hv_err) |
| 1037 | goto out_free_table; |
| 1038 | |
| 1039 | return 0; |
| 1040 | |
| 1041 | out_free_table: |
| 1042 | free_pages((unsigned long) table, order); |
| 1043 | iommu->page_table = NULL; |
| 1044 | |
| 1045 | out_free_map: |
| 1046 | kfree(iommu->arena.map); |
| 1047 | iommu->arena.map = NULL; |
| 1048 | |
| 1049 | return err; |
| 1050 | } |
| 1051 | |
| 1052 | static void ldc_iommu_release(struct ldc_channel *lp) |
| 1053 | { |
| 1054 | struct ldc_iommu *iommu = &lp->iommu; |
| 1055 | unsigned long num_tsb_entries, tsbsize, order; |
| 1056 | |
| 1057 | (void) sun4v_ldc_set_map_table(lp->id, 0, 0); |
| 1058 | |
| 1059 | num_tsb_entries = iommu->arena.limit; |
| 1060 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
| 1061 | order = get_order(tsbsize); |
| 1062 | |
| 1063 | free_pages((unsigned long) iommu->page_table, order); |
| 1064 | iommu->page_table = NULL; |
| 1065 | |
| 1066 | kfree(iommu->arena.map); |
| 1067 | iommu->arena.map = NULL; |
| 1068 | } |
| 1069 | |
| 1070 | struct ldc_channel *ldc_alloc(unsigned long id, |
| 1071 | const struct ldc_channel_config *cfgp, |
| 1072 | void *event_arg) |
| 1073 | { |
| 1074 | struct ldc_channel *lp; |
| 1075 | const struct ldc_mode_ops *mops; |
| 1076 | unsigned long dummy1, dummy2, hv_err; |
| 1077 | u8 mss, *mssbuf; |
| 1078 | int err; |
| 1079 | |
| 1080 | err = -ENODEV; |
| 1081 | if (!ldom_domaining_enabled) |
| 1082 | goto out_err; |
| 1083 | |
| 1084 | err = -EINVAL; |
| 1085 | if (!cfgp) |
| 1086 | goto out_err; |
| 1087 | |
| 1088 | switch (cfgp->mode) { |
| 1089 | case LDC_MODE_RAW: |
| 1090 | mops = &raw_ops; |
| 1091 | mss = LDC_PACKET_SIZE; |
| 1092 | break; |
| 1093 | |
| 1094 | case LDC_MODE_UNRELIABLE: |
| 1095 | mops = &nonraw_ops; |
| 1096 | mss = LDC_PACKET_SIZE - 8; |
| 1097 | break; |
| 1098 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1099 | case LDC_MODE_STREAM: |
| 1100 | mops = &stream_ops; |
| 1101 | mss = LDC_PACKET_SIZE - 8 - 8; |
| 1102 | break; |
| 1103 | |
| 1104 | default: |
| 1105 | goto out_err; |
| 1106 | } |
| 1107 | |
| 1108 | if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) |
| 1109 | goto out_err; |
| 1110 | |
| 1111 | hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); |
| 1112 | err = -ENODEV; |
| 1113 | if (hv_err == HV_ECHANNEL) |
| 1114 | goto out_err; |
| 1115 | |
| 1116 | err = -EEXIST; |
| 1117 | if (__ldc_channel_exists(id)) |
| 1118 | goto out_err; |
| 1119 | |
| 1120 | mssbuf = NULL; |
| 1121 | |
| 1122 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); |
| 1123 | err = -ENOMEM; |
| 1124 | if (!lp) |
| 1125 | goto out_err; |
| 1126 | |
| 1127 | spin_lock_init(&lp->lock); |
| 1128 | |
| 1129 | lp->id = id; |
| 1130 | |
| 1131 | err = ldc_iommu_init(lp); |
| 1132 | if (err) |
| 1133 | goto out_free_ldc; |
| 1134 | |
| 1135 | lp->mops = mops; |
| 1136 | lp->mss = mss; |
| 1137 | |
| 1138 | lp->cfg = *cfgp; |
| 1139 | if (!lp->cfg.mtu) |
| 1140 | lp->cfg.mtu = LDC_DEFAULT_MTU; |
| 1141 | |
| 1142 | if (lp->cfg.mode == LDC_MODE_STREAM) { |
| 1143 | mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL); |
| 1144 | if (!mssbuf) { |
| 1145 | err = -ENOMEM; |
| 1146 | goto out_free_iommu; |
| 1147 | } |
| 1148 | lp->mssbuf = mssbuf; |
| 1149 | } |
| 1150 | |
| 1151 | lp->event_arg = event_arg; |
| 1152 | |
| 1153 | /* XXX allow setting via ldc_channel_config to override defaults |
| 1154 | * XXX or use some formula based upon mtu |
| 1155 | */ |
| 1156 | lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; |
| 1157 | lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; |
| 1158 | |
| 1159 | err = alloc_queue("TX", lp->tx_num_entries, |
| 1160 | &lp->tx_base, &lp->tx_ra); |
| 1161 | if (err) |
| 1162 | goto out_free_mssbuf; |
| 1163 | |
| 1164 | err = alloc_queue("RX", lp->rx_num_entries, |
| 1165 | &lp->rx_base, &lp->rx_ra); |
| 1166 | if (err) |
| 1167 | goto out_free_txq; |
| 1168 | |
| 1169 | lp->flags |= LDC_FLAG_ALLOCED_QUEUES; |
| 1170 | |
| 1171 | lp->hs_state = LDC_HS_CLOSED; |
| 1172 | ldc_set_state(lp, LDC_STATE_INIT); |
| 1173 | |
| 1174 | INIT_HLIST_NODE(&lp->list); |
| 1175 | hlist_add_head(&lp->list, &ldc_channel_list); |
| 1176 | |
| 1177 | INIT_HLIST_HEAD(&lp->mh_list); |
| 1178 | |
| 1179 | return lp; |
| 1180 | |
| 1181 | out_free_txq: |
| 1182 | free_queue(lp->tx_num_entries, lp->tx_base); |
| 1183 | |
| 1184 | out_free_mssbuf: |
| 1185 | if (mssbuf) |
| 1186 | kfree(mssbuf); |
| 1187 | |
| 1188 | out_free_iommu: |
| 1189 | ldc_iommu_release(lp); |
| 1190 | |
| 1191 | out_free_ldc: |
| 1192 | kfree(lp); |
| 1193 | |
| 1194 | out_err: |
| 1195 | return ERR_PTR(err); |
| 1196 | } |
| 1197 | EXPORT_SYMBOL(ldc_alloc); |
| 1198 | |
| 1199 | void ldc_free(struct ldc_channel *lp) |
| 1200 | { |
| 1201 | if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { |
| 1202 | free_irq(lp->cfg.rx_irq, lp); |
| 1203 | free_irq(lp->cfg.tx_irq, lp); |
| 1204 | } |
| 1205 | |
| 1206 | if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { |
| 1207 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1208 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1209 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; |
| 1210 | } |
| 1211 | if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { |
| 1212 | free_queue(lp->tx_num_entries, lp->tx_base); |
| 1213 | free_queue(lp->rx_num_entries, lp->rx_base); |
| 1214 | lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; |
| 1215 | } |
| 1216 | |
| 1217 | hlist_del(&lp->list); |
| 1218 | |
| 1219 | if (lp->mssbuf) |
| 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 | */ |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1233 | int ldc_bind(struct ldc_channel *lp, const char *name) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1234 | { |
| 1235 | unsigned long hv_err, flags; |
| 1236 | int err = -EINVAL; |
| 1237 | |
| 1238 | spin_lock_irqsave(&lp->lock, flags); |
| 1239 | |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1240 | if (!name) |
| 1241 | goto out_err; |
| 1242 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1243 | if (lp->state != LDC_STATE_INIT) |
| 1244 | goto out_err; |
| 1245 | |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1246 | snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); |
| 1247 | snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); |
| 1248 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1249 | err = request_irq(lp->cfg.rx_irq, ldc_rx, |
| 1250 | IRQF_SAMPLE_RANDOM | IRQF_SHARED, |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1251 | lp->rx_irq_name, lp); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1252 | if (err) |
| 1253 | goto out_err; |
| 1254 | |
| 1255 | err = request_irq(lp->cfg.tx_irq, ldc_tx, |
| 1256 | IRQF_SAMPLE_RANDOM | IRQF_SHARED, |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1257 | lp->tx_irq_name, lp); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1258 | if (err) |
| 1259 | goto out_free_rx_irq; |
| 1260 | |
| 1261 | |
| 1262 | lp->flags |= LDC_FLAG_REGISTERED_IRQS; |
| 1263 | |
| 1264 | err = -ENODEV; |
| 1265 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1266 | if (hv_err) |
| 1267 | goto out_free_tx_irq; |
| 1268 | |
| 1269 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
| 1270 | if (hv_err) |
| 1271 | goto out_free_tx_irq; |
| 1272 | |
| 1273 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1274 | if (hv_err) |
| 1275 | goto out_unmap_tx; |
| 1276 | |
| 1277 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
| 1278 | if (hv_err) |
| 1279 | goto out_unmap_tx; |
| 1280 | |
| 1281 | lp->flags |= LDC_FLAG_REGISTERED_QUEUES; |
| 1282 | |
| 1283 | hv_err = sun4v_ldc_tx_get_state(lp->id, |
| 1284 | &lp->tx_head, |
| 1285 | &lp->tx_tail, |
| 1286 | &lp->chan_state); |
| 1287 | err = -EBUSY; |
| 1288 | if (hv_err) |
| 1289 | goto out_unmap_rx; |
| 1290 | |
| 1291 | lp->tx_acked = lp->tx_head; |
| 1292 | |
| 1293 | lp->hs_state = LDC_HS_OPEN; |
| 1294 | ldc_set_state(lp, LDC_STATE_BOUND); |
| 1295 | |
| 1296 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1297 | |
| 1298 | return 0; |
| 1299 | |
| 1300 | out_unmap_rx: |
| 1301 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; |
| 1302 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1303 | |
| 1304 | out_unmap_tx: |
| 1305 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1306 | |
| 1307 | out_free_tx_irq: |
| 1308 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
| 1309 | free_irq(lp->cfg.tx_irq, lp); |
| 1310 | |
| 1311 | out_free_rx_irq: |
| 1312 | free_irq(lp->cfg.rx_irq, lp); |
| 1313 | |
| 1314 | out_err: |
| 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 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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) { |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1591 | ldcdbg(DATA, "DATA WAIT DONE " |
| 1592 | "head[%lx] tail[%lx] chan_state[%lx]\n", |
| 1593 | dummy, lp->rx_tail, lp->chan_state); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 | |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 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 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 | |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1665 | ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1666 | "rcv_nxt[%08x]\n", |
| 1667 | p->type, |
| 1668 | p->stype, |
| 1669 | p->ctrl, |
| 1670 | p->env, |
| 1671 | p->seqid, |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1672 | p->u.r.ackid, |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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); |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1701 | err = rx_set_head(lp, new); |
| 1702 | if (err) |
| 1703 | break; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 | |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1780 | if (!err) { |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1781 | err = copied; |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1782 | if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) |
| 1783 | send_data_ack(lp); |
| 1784 | } |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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) { |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1805 | int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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, i, start, end, limit; |
| 1880 | int pass; |
| 1881 | |
| 1882 | limit = arena->limit; |
| 1883 | start = arena->hint; |
| 1884 | pass = 0; |
| 1885 | |
| 1886 | again: |
| 1887 | n = find_next_zero_bit(arena->map, limit, start); |
| 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 | |
| 1901 | for (i = n; i < end; i++) { |
| 1902 | if (test_bit(i, arena->map)) { |
| 1903 | start = i + 1; |
| 1904 | goto again; |
| 1905 | } |
| 1906 | } |
| 1907 | |
| 1908 | for (i = n; i < end; i++) |
| 1909 | __set_bit(i, arena->map); |
| 1910 | |
| 1911 | arena->hint = end; |
| 1912 | |
| 1913 | return n; |
| 1914 | } |
| 1915 | |
| 1916 | #define COOKIE_PGSZ_CODE 0xf000000000000000ULL |
| 1917 | #define COOKIE_PGSZ_CODE_SHIFT 60ULL |
| 1918 | |
| 1919 | static u64 pagesize_code(void) |
| 1920 | { |
| 1921 | switch (PAGE_SIZE) { |
| 1922 | default: |
| 1923 | case (8ULL * 1024ULL): |
| 1924 | return 0; |
| 1925 | case (64ULL * 1024ULL): |
| 1926 | return 1; |
| 1927 | case (512ULL * 1024ULL): |
| 1928 | return 2; |
| 1929 | case (4ULL * 1024ULL * 1024ULL): |
| 1930 | return 3; |
| 1931 | case (32ULL * 1024ULL * 1024ULL): |
| 1932 | return 4; |
| 1933 | case (256ULL * 1024ULL * 1024ULL): |
| 1934 | return 5; |
| 1935 | } |
| 1936 | } |
| 1937 | |
| 1938 | static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) |
| 1939 | { |
| 1940 | return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | |
| 1941 | (index << PAGE_SHIFT) | |
| 1942 | page_offset); |
| 1943 | } |
| 1944 | |
| 1945 | static u64 cookie_to_index(u64 cookie, unsigned long *shift) |
| 1946 | { |
| 1947 | u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; |
| 1948 | |
| 1949 | cookie &= ~COOKIE_PGSZ_CODE; |
| 1950 | |
| 1951 | *shift = szcode * 3; |
| 1952 | |
| 1953 | return (cookie >> (13ULL + (szcode * 3ULL))); |
| 1954 | } |
| 1955 | |
| 1956 | static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, |
| 1957 | unsigned long npages) |
| 1958 | { |
| 1959 | long entry; |
| 1960 | |
| 1961 | entry = arena_alloc(iommu, npages); |
| 1962 | if (unlikely(entry < 0)) |
| 1963 | return NULL; |
| 1964 | |
| 1965 | return iommu->page_table + entry; |
| 1966 | } |
| 1967 | |
| 1968 | static u64 perm_to_mte(unsigned int map_perm) |
| 1969 | { |
| 1970 | u64 mte_base; |
| 1971 | |
| 1972 | mte_base = pagesize_code(); |
| 1973 | |
| 1974 | if (map_perm & LDC_MAP_SHADOW) { |
| 1975 | if (map_perm & LDC_MAP_R) |
| 1976 | mte_base |= LDC_MTE_COPY_R; |
| 1977 | if (map_perm & LDC_MAP_W) |
| 1978 | mte_base |= LDC_MTE_COPY_W; |
| 1979 | } |
| 1980 | if (map_perm & LDC_MAP_DIRECT) { |
| 1981 | if (map_perm & LDC_MAP_R) |
| 1982 | mte_base |= LDC_MTE_READ; |
| 1983 | if (map_perm & LDC_MAP_W) |
| 1984 | mte_base |= LDC_MTE_WRITE; |
| 1985 | if (map_perm & LDC_MAP_X) |
| 1986 | mte_base |= LDC_MTE_EXEC; |
| 1987 | } |
| 1988 | if (map_perm & LDC_MAP_IO) { |
| 1989 | if (map_perm & LDC_MAP_R) |
| 1990 | mte_base |= LDC_MTE_IOMMU_R; |
| 1991 | if (map_perm & LDC_MAP_W) |
| 1992 | mte_base |= LDC_MTE_IOMMU_W; |
| 1993 | } |
| 1994 | |
| 1995 | return mte_base; |
| 1996 | } |
| 1997 | |
| 1998 | static int pages_in_region(unsigned long base, long len) |
| 1999 | { |
| 2000 | int count = 0; |
| 2001 | |
| 2002 | do { |
| 2003 | unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; |
| 2004 | |
| 2005 | len -= (new - base); |
| 2006 | base = new; |
| 2007 | count++; |
| 2008 | } while (len > 0); |
| 2009 | |
| 2010 | return count; |
| 2011 | } |
| 2012 | |
| 2013 | struct cookie_state { |
| 2014 | struct ldc_mtable_entry *page_table; |
| 2015 | struct ldc_trans_cookie *cookies; |
| 2016 | u64 mte_base; |
| 2017 | u64 prev_cookie; |
| 2018 | u32 pte_idx; |
| 2019 | u32 nc; |
| 2020 | }; |
| 2021 | |
| 2022 | static void fill_cookies(struct cookie_state *sp, unsigned long pa, |
| 2023 | unsigned long off, unsigned long len) |
| 2024 | { |
| 2025 | do { |
| 2026 | unsigned long tlen, new = pa + PAGE_SIZE; |
| 2027 | u64 this_cookie; |
| 2028 | |
| 2029 | sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; |
| 2030 | |
| 2031 | tlen = PAGE_SIZE; |
| 2032 | if (off) |
| 2033 | tlen = PAGE_SIZE - off; |
| 2034 | if (tlen > len) |
| 2035 | tlen = len; |
| 2036 | |
| 2037 | this_cookie = make_cookie(sp->pte_idx, |
| 2038 | pagesize_code(), off); |
| 2039 | |
| 2040 | off = 0; |
| 2041 | |
| 2042 | if (this_cookie == sp->prev_cookie) { |
| 2043 | sp->cookies[sp->nc - 1].cookie_size += tlen; |
| 2044 | } else { |
| 2045 | sp->cookies[sp->nc].cookie_addr = this_cookie; |
| 2046 | sp->cookies[sp->nc].cookie_size = tlen; |
| 2047 | sp->nc++; |
| 2048 | } |
| 2049 | sp->prev_cookie = this_cookie + tlen; |
| 2050 | |
| 2051 | sp->pte_idx++; |
| 2052 | |
| 2053 | len -= tlen; |
| 2054 | pa = new; |
| 2055 | } while (len > 0); |
| 2056 | } |
| 2057 | |
| 2058 | static int sg_count_one(struct scatterlist *sg) |
| 2059 | { |
Jens Axboe | 58b053e | 2007-10-22 20:02:46 +0200 | [diff] [blame] | 2060 | unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2061 | long len = sg->length; |
| 2062 | |
| 2063 | if ((sg->offset | len) & (8UL - 1)) |
| 2064 | return -EFAULT; |
| 2065 | |
| 2066 | return pages_in_region(base + sg->offset, len); |
| 2067 | } |
| 2068 | |
| 2069 | static int sg_count_pages(struct scatterlist *sg, int num_sg) |
| 2070 | { |
| 2071 | int count; |
| 2072 | int i; |
| 2073 | |
| 2074 | count = 0; |
| 2075 | for (i = 0; i < num_sg; i++) { |
| 2076 | int err = sg_count_one(sg + i); |
| 2077 | if (err < 0) |
| 2078 | return err; |
| 2079 | count += err; |
| 2080 | } |
| 2081 | |
| 2082 | return count; |
| 2083 | } |
| 2084 | |
| 2085 | int ldc_map_sg(struct ldc_channel *lp, |
| 2086 | struct scatterlist *sg, int num_sg, |
| 2087 | struct ldc_trans_cookie *cookies, int ncookies, |
| 2088 | unsigned int map_perm) |
| 2089 | { |
| 2090 | unsigned long i, npages, flags; |
| 2091 | struct ldc_mtable_entry *base; |
| 2092 | struct cookie_state state; |
| 2093 | struct ldc_iommu *iommu; |
| 2094 | int err; |
| 2095 | |
| 2096 | if (map_perm & ~LDC_MAP_ALL) |
| 2097 | return -EINVAL; |
| 2098 | |
| 2099 | err = sg_count_pages(sg, num_sg); |
| 2100 | if (err < 0) |
| 2101 | return err; |
| 2102 | |
| 2103 | npages = err; |
| 2104 | if (err > ncookies) |
| 2105 | return -EMSGSIZE; |
| 2106 | |
| 2107 | iommu = &lp->iommu; |
| 2108 | |
| 2109 | spin_lock_irqsave(&iommu->lock, flags); |
| 2110 | base = alloc_npages(iommu, npages); |
| 2111 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 2112 | |
| 2113 | if (!base) |
| 2114 | return -ENOMEM; |
| 2115 | |
| 2116 | state.page_table = iommu->page_table; |
| 2117 | state.cookies = cookies; |
| 2118 | state.mte_base = perm_to_mte(map_perm); |
| 2119 | state.prev_cookie = ~(u64)0; |
| 2120 | state.pte_idx = (base - iommu->page_table); |
| 2121 | state.nc = 0; |
| 2122 | |
| 2123 | for (i = 0; i < num_sg; i++) |
David Miller | d91c5e8 | 2007-10-24 08:46:01 +0200 | [diff] [blame^] | 2124 | fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT, |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2125 | sg[i].offset, sg[i].length); |
| 2126 | |
| 2127 | return state.nc; |
| 2128 | } |
| 2129 | EXPORT_SYMBOL(ldc_map_sg); |
| 2130 | |
| 2131 | int ldc_map_single(struct ldc_channel *lp, |
| 2132 | void *buf, unsigned int len, |
| 2133 | struct ldc_trans_cookie *cookies, int ncookies, |
| 2134 | unsigned int map_perm) |
| 2135 | { |
| 2136 | unsigned long npages, pa, flags; |
| 2137 | struct ldc_mtable_entry *base; |
| 2138 | struct cookie_state state; |
| 2139 | struct ldc_iommu *iommu; |
| 2140 | |
| 2141 | if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) |
| 2142 | return -EINVAL; |
| 2143 | |
| 2144 | pa = __pa(buf); |
| 2145 | if ((pa | len) & (8UL - 1)) |
| 2146 | return -EFAULT; |
| 2147 | |
| 2148 | npages = pages_in_region(pa, len); |
| 2149 | |
| 2150 | iommu = &lp->iommu; |
| 2151 | |
| 2152 | spin_lock_irqsave(&iommu->lock, flags); |
| 2153 | base = alloc_npages(iommu, npages); |
| 2154 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 2155 | |
| 2156 | if (!base) |
| 2157 | return -ENOMEM; |
| 2158 | |
| 2159 | state.page_table = iommu->page_table; |
| 2160 | state.cookies = cookies; |
| 2161 | state.mte_base = perm_to_mte(map_perm); |
| 2162 | state.prev_cookie = ~(u64)0; |
| 2163 | state.pte_idx = (base - iommu->page_table); |
| 2164 | state.nc = 0; |
| 2165 | fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); |
| 2166 | BUG_ON(state.nc != 1); |
| 2167 | |
| 2168 | return state.nc; |
| 2169 | } |
| 2170 | EXPORT_SYMBOL(ldc_map_single); |
| 2171 | |
| 2172 | static void free_npages(unsigned long id, struct ldc_iommu *iommu, |
| 2173 | u64 cookie, u64 size) |
| 2174 | { |
| 2175 | struct iommu_arena *arena = &iommu->arena; |
| 2176 | unsigned long i, shift, index, npages; |
| 2177 | struct ldc_mtable_entry *base; |
| 2178 | |
| 2179 | npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; |
| 2180 | index = cookie_to_index(cookie, &shift); |
| 2181 | base = iommu->page_table + index; |
| 2182 | |
| 2183 | BUG_ON(index > arena->limit || |
| 2184 | (index + npages) > arena->limit); |
| 2185 | |
| 2186 | for (i = 0; i < npages; i++) { |
| 2187 | if (base->cookie) |
| 2188 | sun4v_ldc_revoke(id, cookie + (i << shift), |
| 2189 | base->cookie); |
| 2190 | base->mte = 0; |
| 2191 | __clear_bit(index + i, arena->map); |
| 2192 | } |
| 2193 | } |
| 2194 | |
| 2195 | void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, |
| 2196 | int ncookies) |
| 2197 | { |
| 2198 | struct ldc_iommu *iommu = &lp->iommu; |
| 2199 | unsigned long flags; |
| 2200 | int i; |
| 2201 | |
| 2202 | spin_lock_irqsave(&iommu->lock, flags); |
| 2203 | for (i = 0; i < ncookies; i++) { |
| 2204 | u64 addr = cookies[i].cookie_addr; |
| 2205 | u64 size = cookies[i].cookie_size; |
| 2206 | |
| 2207 | free_npages(lp->id, iommu, addr, size); |
| 2208 | } |
| 2209 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 2210 | } |
| 2211 | EXPORT_SYMBOL(ldc_unmap); |
| 2212 | |
| 2213 | int ldc_copy(struct ldc_channel *lp, int copy_dir, |
| 2214 | void *buf, unsigned int len, unsigned long offset, |
| 2215 | struct ldc_trans_cookie *cookies, int ncookies) |
| 2216 | { |
| 2217 | unsigned int orig_len; |
| 2218 | unsigned long ra; |
| 2219 | int i; |
| 2220 | |
| 2221 | if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { |
| 2222 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n", |
| 2223 | lp->id, copy_dir); |
| 2224 | return -EINVAL; |
| 2225 | } |
| 2226 | |
| 2227 | ra = __pa(buf); |
| 2228 | if ((ra | len | offset) & (8UL - 1)) { |
| 2229 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " |
| 2230 | "ra[%lx] len[%x] offset[%lx]\n", |
| 2231 | lp->id, ra, len, offset); |
| 2232 | return -EFAULT; |
| 2233 | } |
| 2234 | |
| 2235 | if (lp->hs_state != LDC_HS_COMPLETE || |
| 2236 | (lp->flags & LDC_FLAG_RESET)) { |
| 2237 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " |
| 2238 | "flags[%x]\n", lp->id, lp->hs_state, lp->flags); |
| 2239 | return -ECONNRESET; |
| 2240 | } |
| 2241 | |
| 2242 | orig_len = len; |
| 2243 | for (i = 0; i < ncookies; i++) { |
| 2244 | unsigned long cookie_raddr = cookies[i].cookie_addr; |
| 2245 | unsigned long this_len = cookies[i].cookie_size; |
| 2246 | unsigned long actual_len; |
| 2247 | |
| 2248 | if (unlikely(offset)) { |
| 2249 | unsigned long this_off = offset; |
| 2250 | |
| 2251 | if (this_off > this_len) |
| 2252 | this_off = this_len; |
| 2253 | |
| 2254 | offset -= this_off; |
| 2255 | this_len -= this_off; |
| 2256 | if (!this_len) |
| 2257 | continue; |
| 2258 | cookie_raddr += this_off; |
| 2259 | } |
| 2260 | |
| 2261 | if (this_len > len) |
| 2262 | this_len = len; |
| 2263 | |
| 2264 | while (1) { |
| 2265 | unsigned long hv_err; |
| 2266 | |
| 2267 | hv_err = sun4v_ldc_copy(lp->id, copy_dir, |
| 2268 | cookie_raddr, ra, |
| 2269 | this_len, &actual_len); |
| 2270 | if (unlikely(hv_err)) { |
| 2271 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] " |
| 2272 | "HV error %lu\n", |
| 2273 | lp->id, hv_err); |
| 2274 | if (lp->hs_state != LDC_HS_COMPLETE || |
| 2275 | (lp->flags & LDC_FLAG_RESET)) |
| 2276 | return -ECONNRESET; |
| 2277 | else |
| 2278 | return -EFAULT; |
| 2279 | } |
| 2280 | |
| 2281 | cookie_raddr += actual_len; |
| 2282 | ra += actual_len; |
| 2283 | len -= actual_len; |
| 2284 | if (actual_len == this_len) |
| 2285 | break; |
| 2286 | |
| 2287 | this_len -= actual_len; |
| 2288 | } |
| 2289 | |
| 2290 | if (!len) |
| 2291 | break; |
| 2292 | } |
| 2293 | |
| 2294 | /* It is caller policy what to do about short copies. |
| 2295 | * For example, a networking driver can declare the |
| 2296 | * packet a runt and drop it. |
| 2297 | */ |
| 2298 | |
| 2299 | return orig_len - len; |
| 2300 | } |
| 2301 | EXPORT_SYMBOL(ldc_copy); |
| 2302 | |
| 2303 | void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, |
| 2304 | struct ldc_trans_cookie *cookies, int *ncookies, |
| 2305 | unsigned int map_perm) |
| 2306 | { |
| 2307 | void *buf; |
| 2308 | int err; |
| 2309 | |
| 2310 | if (len & (8UL - 1)) |
| 2311 | return ERR_PTR(-EINVAL); |
| 2312 | |
| 2313 | buf = kzalloc(len, GFP_KERNEL); |
| 2314 | if (!buf) |
| 2315 | return ERR_PTR(-ENOMEM); |
| 2316 | |
| 2317 | err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); |
| 2318 | if (err < 0) { |
| 2319 | kfree(buf); |
| 2320 | return ERR_PTR(err); |
| 2321 | } |
| 2322 | *ncookies = err; |
| 2323 | |
| 2324 | return buf; |
| 2325 | } |
| 2326 | EXPORT_SYMBOL(ldc_alloc_exp_dring); |
| 2327 | |
| 2328 | void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, |
| 2329 | struct ldc_trans_cookie *cookies, int ncookies) |
| 2330 | { |
| 2331 | ldc_unmap(lp, cookies, ncookies); |
| 2332 | kfree(buf); |
| 2333 | } |
| 2334 | EXPORT_SYMBOL(ldc_free_exp_dring); |
| 2335 | |
| 2336 | static int __init ldc_init(void) |
| 2337 | { |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2338 | unsigned long major, minor; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2339 | struct mdesc_handle *hp; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2340 | const u64 *v; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2341 | u64 mp; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2342 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2343 | hp = mdesc_grab(); |
| 2344 | if (!hp) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2345 | return -ENODEV; |
| 2346 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2347 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); |
| 2348 | if (mp == MDESC_NODE_NULL) |
| 2349 | return -ENODEV; |
| 2350 | |
| 2351 | v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2352 | if (!v) |
| 2353 | return -ENODEV; |
| 2354 | |
| 2355 | major = 1; |
| 2356 | minor = 0; |
| 2357 | if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { |
| 2358 | printk(KERN_INFO PFX "Could not register LDOM hvapi.\n"); |
| 2359 | return -ENODEV; |
| 2360 | } |
| 2361 | |
| 2362 | printk(KERN_INFO "%s", version); |
| 2363 | |
| 2364 | if (!*v) { |
| 2365 | printk(KERN_INFO PFX "Domaining disabled.\n"); |
| 2366 | return -ENODEV; |
| 2367 | } |
| 2368 | ldom_domaining_enabled = 1; |
| 2369 | |
| 2370 | return 0; |
| 2371 | } |
| 2372 | |
| 2373 | core_initcall(ldc_init); |