David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1 | /* ldc.c: Logical Domain Channel link-layer protocol driver. |
| 2 | * |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 4 | */ |
| 5 | |
| 6 | #include <linux/kernel.h> |
Paul Gortmaker | 066bcac | 2011-07-22 13:18:16 -0400 | [diff] [blame] | 7 | #include <linux/export.h> |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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> |
Akinobu Mita | e756fd8 | 2009-12-15 16:48:30 -0800 | [diff] [blame] | 17 | #include <linux/bitmap.h> |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 ": " |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 27 | #define DRV_MODULE_VERSION "1.1" |
| 28 | #define DRV_MODULE_RELDATE "July 22, 2008" |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 29 | |
Greg Kroah-Hartman | 7c9503b | 2012-12-21 14:03:26 -0800 | [diff] [blame] | 30 | static char version[] = |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 | |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 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 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 | { |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 247 | if (lp->cfg.mode == LDC_MODE_STREAM) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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; |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 501 | p->seqid = lp->snd_nxt + 1; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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; |
Steven Rostedt | b2c0805 | 2009-01-06 10:02:38 -0800 | [diff] [blame] | 629 | struct ldc_packet *p; |
| 630 | unsigned long new_tail; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 631 | |
Steven Rostedt | b2c0805 | 2009-01-06 10:02:38 -0800 | [diff] [blame] | 632 | if (vp->major == 0 && vp->minor == 0) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 633 | return ldc_abort(lp); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 634 | |
Steven Rostedt | b2c0805 | 2009-01-06 10:02:38 -0800 | [diff] [blame] | 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, |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 640 | vap, sizeof(*vap), |
| 641 | &new_tail); |
Steven Rostedt | b2c0805 | 2009-01-06 10:02:38 -0800 | [diff] [blame] | 642 | if (!p) |
| 643 | return ldc_abort(lp); |
| 644 | |
| 645 | return send_tx_packet(lp, p, new_tail); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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 | } |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 773 | if (head == lp->tx_tail) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 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; |
David S. Miller | c6fee08 | 2011-02-26 23:40:02 -0800 | [diff] [blame] | 793 | unsigned long orig_state, flags; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 794 | unsigned int event_mask; |
| 795 | |
| 796 | spin_lock_irqsave(&lp->lock, flags); |
| 797 | |
| 798 | orig_state = lp->chan_state; |
David S. Miller | c6fee08 | 2011-02-26 23:40:02 -0800 | [diff] [blame] | 799 | |
| 800 | /* We should probably check for hypervisor errors here and |
| 801 | * reset the LDC channel if we get one. |
| 802 | */ |
| 803 | sun4v_ldc_rx_get_state(lp->id, |
| 804 | &lp->rx_head, |
| 805 | &lp->rx_tail, |
| 806 | &lp->chan_state); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 807 | |
| 808 | ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", |
| 809 | orig_state, lp->chan_state, lp->rx_head, lp->rx_tail); |
| 810 | |
| 811 | event_mask = 0; |
| 812 | |
| 813 | if (lp->cfg.mode == LDC_MODE_RAW && |
| 814 | lp->chan_state == LDC_CHANNEL_UP) { |
| 815 | lp->hs_state = LDC_HS_COMPLETE; |
| 816 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
| 817 | |
| 818 | event_mask |= LDC_EVENT_UP; |
| 819 | |
| 820 | orig_state = lp->chan_state; |
| 821 | } |
| 822 | |
| 823 | /* If we are in reset state, flush the RX queue and ignore |
| 824 | * everything. |
| 825 | */ |
| 826 | if (lp->flags & LDC_FLAG_RESET) { |
| 827 | (void) __set_rx_head(lp, lp->rx_tail); |
| 828 | goto out; |
| 829 | } |
| 830 | |
| 831 | /* Once we finish the handshake, we let the ldc_read() |
| 832 | * paths do all of the control frame and state management. |
| 833 | * Just trigger the callback. |
| 834 | */ |
| 835 | if (lp->hs_state == LDC_HS_COMPLETE) { |
| 836 | handshake_complete: |
| 837 | if (lp->chan_state != orig_state) { |
| 838 | unsigned int event = LDC_EVENT_RESET; |
| 839 | |
| 840 | if (lp->chan_state == LDC_CHANNEL_UP) |
| 841 | event = LDC_EVENT_UP; |
| 842 | |
| 843 | event_mask |= event; |
| 844 | } |
| 845 | if (lp->rx_head != lp->rx_tail) |
| 846 | event_mask |= LDC_EVENT_DATA_READY; |
| 847 | |
| 848 | goto out; |
| 849 | } |
| 850 | |
| 851 | if (lp->chan_state != orig_state) |
| 852 | goto out; |
| 853 | |
| 854 | while (lp->rx_head != lp->rx_tail) { |
| 855 | struct ldc_packet *p; |
| 856 | unsigned long new; |
| 857 | int err; |
| 858 | |
| 859 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); |
| 860 | |
| 861 | switch (p->type) { |
| 862 | case LDC_CTRL: |
| 863 | err = process_control_frame(lp, p); |
| 864 | if (err > 0) |
| 865 | event_mask |= err; |
| 866 | break; |
| 867 | |
| 868 | case LDC_DATA: |
| 869 | event_mask |= LDC_EVENT_DATA_READY; |
| 870 | err = 0; |
| 871 | break; |
| 872 | |
| 873 | case LDC_ERR: |
| 874 | err = process_error_frame(lp, p); |
| 875 | break; |
| 876 | |
| 877 | default: |
| 878 | err = ldc_abort(lp); |
| 879 | break; |
| 880 | } |
| 881 | |
| 882 | if (err < 0) |
| 883 | break; |
| 884 | |
| 885 | new = lp->rx_head; |
| 886 | new += LDC_PACKET_SIZE; |
| 887 | if (new == (lp->rx_num_entries * LDC_PACKET_SIZE)) |
| 888 | new = 0; |
| 889 | lp->rx_head = new; |
| 890 | |
| 891 | err = __set_rx_head(lp, new); |
| 892 | if (err < 0) { |
| 893 | (void) ldc_abort(lp); |
| 894 | break; |
| 895 | } |
| 896 | if (lp->hs_state == LDC_HS_COMPLETE) |
| 897 | goto handshake_complete; |
| 898 | } |
| 899 | |
| 900 | out: |
| 901 | spin_unlock_irqrestore(&lp->lock, flags); |
| 902 | |
| 903 | send_events(lp, event_mask); |
| 904 | |
| 905 | return IRQ_HANDLED; |
| 906 | } |
| 907 | |
| 908 | static irqreturn_t ldc_tx(int irq, void *dev_id) |
| 909 | { |
| 910 | struct ldc_channel *lp = dev_id; |
David S. Miller | c6fee08 | 2011-02-26 23:40:02 -0800 | [diff] [blame] | 911 | unsigned long flags, orig_state; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 912 | unsigned int event_mask = 0; |
| 913 | |
| 914 | spin_lock_irqsave(&lp->lock, flags); |
| 915 | |
| 916 | orig_state = lp->chan_state; |
David S. Miller | c6fee08 | 2011-02-26 23:40:02 -0800 | [diff] [blame] | 917 | |
| 918 | /* We should probably check for hypervisor errors here and |
| 919 | * reset the LDC channel if we get one. |
| 920 | */ |
| 921 | sun4v_ldc_tx_get_state(lp->id, |
| 922 | &lp->tx_head, |
| 923 | &lp->tx_tail, |
| 924 | &lp->chan_state); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 925 | |
| 926 | ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", |
| 927 | orig_state, lp->chan_state, lp->tx_head, lp->tx_tail); |
| 928 | |
| 929 | if (lp->cfg.mode == LDC_MODE_RAW && |
| 930 | lp->chan_state == LDC_CHANNEL_UP) { |
| 931 | lp->hs_state = LDC_HS_COMPLETE; |
| 932 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
| 933 | |
| 934 | event_mask |= LDC_EVENT_UP; |
| 935 | } |
| 936 | |
| 937 | spin_unlock_irqrestore(&lp->lock, flags); |
| 938 | |
| 939 | send_events(lp, event_mask); |
| 940 | |
| 941 | return IRQ_HANDLED; |
| 942 | } |
| 943 | |
| 944 | /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so |
| 945 | * XXX that addition and removal from the ldc_channel_list has |
| 946 | * XXX atomicity, otherwise the __ldc_channel_exists() check is |
| 947 | * XXX totally pointless as another thread can slip into ldc_alloc() |
| 948 | * XXX and add a channel with the same ID. There also needs to be |
| 949 | * XXX a spinlock for ldc_channel_list. |
| 950 | */ |
| 951 | static HLIST_HEAD(ldc_channel_list); |
| 952 | |
| 953 | static int __ldc_channel_exists(unsigned long id) |
| 954 | { |
| 955 | struct ldc_channel *lp; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 956 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 957 | hlist_for_each_entry(lp, &ldc_channel_list, list) { |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 958 | if (lp->id == id) |
| 959 | return 1; |
| 960 | } |
| 961 | return 0; |
| 962 | } |
| 963 | |
| 964 | static int alloc_queue(const char *name, unsigned long num_entries, |
| 965 | struct ldc_packet **base, unsigned long *ra) |
| 966 | { |
| 967 | unsigned long size, order; |
| 968 | void *q; |
| 969 | |
| 970 | size = num_entries * LDC_PACKET_SIZE; |
| 971 | order = get_order(size); |
| 972 | |
| 973 | q = (void *) __get_free_pages(GFP_KERNEL, order); |
| 974 | if (!q) { |
| 975 | printk(KERN_ERR PFX "Alloc of %s queue failed with " |
| 976 | "size=%lu order=%lu\n", name, size, order); |
| 977 | return -ENOMEM; |
| 978 | } |
| 979 | |
| 980 | memset(q, 0, PAGE_SIZE << order); |
| 981 | |
| 982 | *base = q; |
| 983 | *ra = __pa(q); |
| 984 | |
| 985 | return 0; |
| 986 | } |
| 987 | |
| 988 | static void free_queue(unsigned long num_entries, struct ldc_packet *q) |
| 989 | { |
| 990 | unsigned long size, order; |
| 991 | |
| 992 | if (!q) |
| 993 | return; |
| 994 | |
| 995 | size = num_entries * LDC_PACKET_SIZE; |
| 996 | order = get_order(size); |
| 997 | |
| 998 | free_pages((unsigned long)q, order); |
| 999 | } |
| 1000 | |
| 1001 | /* XXX Make this configurable... XXX */ |
| 1002 | #define LDC_IOTABLE_SIZE (8 * 1024) |
| 1003 | |
| 1004 | static int ldc_iommu_init(struct ldc_channel *lp) |
| 1005 | { |
| 1006 | unsigned long sz, num_tsb_entries, tsbsize, order; |
| 1007 | struct ldc_iommu *iommu = &lp->iommu; |
| 1008 | struct ldc_mtable_entry *table; |
| 1009 | unsigned long hv_err; |
| 1010 | int err; |
| 1011 | |
| 1012 | num_tsb_entries = LDC_IOTABLE_SIZE; |
| 1013 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
| 1014 | |
| 1015 | spin_lock_init(&iommu->lock); |
| 1016 | |
| 1017 | sz = num_tsb_entries / 8; |
| 1018 | sz = (sz + 7UL) & ~7UL; |
| 1019 | iommu->arena.map = kzalloc(sz, GFP_KERNEL); |
| 1020 | if (!iommu->arena.map) { |
| 1021 | printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); |
| 1022 | return -ENOMEM; |
| 1023 | } |
| 1024 | |
| 1025 | iommu->arena.limit = num_tsb_entries; |
| 1026 | |
| 1027 | order = get_order(tsbsize); |
| 1028 | |
| 1029 | table = (struct ldc_mtable_entry *) |
| 1030 | __get_free_pages(GFP_KERNEL, order); |
| 1031 | err = -ENOMEM; |
| 1032 | if (!table) { |
| 1033 | printk(KERN_ERR PFX "Alloc of MTE table failed, " |
| 1034 | "size=%lu order=%lu\n", tsbsize, order); |
| 1035 | goto out_free_map; |
| 1036 | } |
| 1037 | |
| 1038 | memset(table, 0, PAGE_SIZE << order); |
| 1039 | |
| 1040 | iommu->page_table = table; |
| 1041 | |
| 1042 | hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), |
| 1043 | num_tsb_entries); |
| 1044 | err = -EINVAL; |
| 1045 | if (hv_err) |
| 1046 | goto out_free_table; |
| 1047 | |
| 1048 | return 0; |
| 1049 | |
| 1050 | out_free_table: |
| 1051 | free_pages((unsigned long) table, order); |
| 1052 | iommu->page_table = NULL; |
| 1053 | |
| 1054 | out_free_map: |
| 1055 | kfree(iommu->arena.map); |
| 1056 | iommu->arena.map = NULL; |
| 1057 | |
| 1058 | return err; |
| 1059 | } |
| 1060 | |
| 1061 | static void ldc_iommu_release(struct ldc_channel *lp) |
| 1062 | { |
| 1063 | struct ldc_iommu *iommu = &lp->iommu; |
| 1064 | unsigned long num_tsb_entries, tsbsize, order; |
| 1065 | |
| 1066 | (void) sun4v_ldc_set_map_table(lp->id, 0, 0); |
| 1067 | |
| 1068 | num_tsb_entries = iommu->arena.limit; |
| 1069 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
| 1070 | order = get_order(tsbsize); |
| 1071 | |
| 1072 | free_pages((unsigned long) iommu->page_table, order); |
| 1073 | iommu->page_table = NULL; |
| 1074 | |
| 1075 | kfree(iommu->arena.map); |
| 1076 | iommu->arena.map = NULL; |
| 1077 | } |
| 1078 | |
| 1079 | struct ldc_channel *ldc_alloc(unsigned long id, |
| 1080 | const struct ldc_channel_config *cfgp, |
| 1081 | void *event_arg) |
| 1082 | { |
| 1083 | struct ldc_channel *lp; |
| 1084 | const struct ldc_mode_ops *mops; |
| 1085 | unsigned long dummy1, dummy2, hv_err; |
| 1086 | u8 mss, *mssbuf; |
| 1087 | int err; |
| 1088 | |
| 1089 | err = -ENODEV; |
| 1090 | if (!ldom_domaining_enabled) |
| 1091 | goto out_err; |
| 1092 | |
| 1093 | err = -EINVAL; |
| 1094 | if (!cfgp) |
| 1095 | goto out_err; |
| 1096 | |
| 1097 | switch (cfgp->mode) { |
| 1098 | case LDC_MODE_RAW: |
| 1099 | mops = &raw_ops; |
| 1100 | mss = LDC_PACKET_SIZE; |
| 1101 | break; |
| 1102 | |
| 1103 | case LDC_MODE_UNRELIABLE: |
| 1104 | mops = &nonraw_ops; |
| 1105 | mss = LDC_PACKET_SIZE - 8; |
| 1106 | break; |
| 1107 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1108 | case LDC_MODE_STREAM: |
| 1109 | mops = &stream_ops; |
| 1110 | mss = LDC_PACKET_SIZE - 8 - 8; |
| 1111 | break; |
| 1112 | |
| 1113 | default: |
| 1114 | goto out_err; |
| 1115 | } |
| 1116 | |
| 1117 | if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) |
| 1118 | goto out_err; |
| 1119 | |
| 1120 | hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); |
| 1121 | err = -ENODEV; |
| 1122 | if (hv_err == HV_ECHANNEL) |
| 1123 | goto out_err; |
| 1124 | |
| 1125 | err = -EEXIST; |
| 1126 | if (__ldc_channel_exists(id)) |
| 1127 | goto out_err; |
| 1128 | |
| 1129 | mssbuf = NULL; |
| 1130 | |
| 1131 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); |
| 1132 | err = -ENOMEM; |
| 1133 | if (!lp) |
| 1134 | goto out_err; |
| 1135 | |
| 1136 | spin_lock_init(&lp->lock); |
| 1137 | |
| 1138 | lp->id = id; |
| 1139 | |
| 1140 | err = ldc_iommu_init(lp); |
| 1141 | if (err) |
| 1142 | goto out_free_ldc; |
| 1143 | |
| 1144 | lp->mops = mops; |
| 1145 | lp->mss = mss; |
| 1146 | |
| 1147 | lp->cfg = *cfgp; |
| 1148 | if (!lp->cfg.mtu) |
| 1149 | lp->cfg.mtu = LDC_DEFAULT_MTU; |
| 1150 | |
| 1151 | if (lp->cfg.mode == LDC_MODE_STREAM) { |
| 1152 | mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL); |
| 1153 | if (!mssbuf) { |
| 1154 | err = -ENOMEM; |
| 1155 | goto out_free_iommu; |
| 1156 | } |
| 1157 | lp->mssbuf = mssbuf; |
| 1158 | } |
| 1159 | |
| 1160 | lp->event_arg = event_arg; |
| 1161 | |
| 1162 | /* XXX allow setting via ldc_channel_config to override defaults |
| 1163 | * XXX or use some formula based upon mtu |
| 1164 | */ |
| 1165 | lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; |
| 1166 | lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; |
| 1167 | |
| 1168 | err = alloc_queue("TX", lp->tx_num_entries, |
| 1169 | &lp->tx_base, &lp->tx_ra); |
| 1170 | if (err) |
| 1171 | goto out_free_mssbuf; |
| 1172 | |
| 1173 | err = alloc_queue("RX", lp->rx_num_entries, |
| 1174 | &lp->rx_base, &lp->rx_ra); |
| 1175 | if (err) |
| 1176 | goto out_free_txq; |
| 1177 | |
| 1178 | lp->flags |= LDC_FLAG_ALLOCED_QUEUES; |
| 1179 | |
| 1180 | lp->hs_state = LDC_HS_CLOSED; |
| 1181 | ldc_set_state(lp, LDC_STATE_INIT); |
| 1182 | |
| 1183 | INIT_HLIST_NODE(&lp->list); |
| 1184 | hlist_add_head(&lp->list, &ldc_channel_list); |
| 1185 | |
| 1186 | INIT_HLIST_HEAD(&lp->mh_list); |
| 1187 | |
| 1188 | return lp; |
| 1189 | |
| 1190 | out_free_txq: |
| 1191 | free_queue(lp->tx_num_entries, lp->tx_base); |
| 1192 | |
| 1193 | out_free_mssbuf: |
Wei Yongjun | ed247e1 | 2009-04-15 03:04:56 -0700 | [diff] [blame] | 1194 | kfree(mssbuf); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1195 | |
| 1196 | out_free_iommu: |
| 1197 | ldc_iommu_release(lp); |
| 1198 | |
| 1199 | out_free_ldc: |
| 1200 | kfree(lp); |
| 1201 | |
| 1202 | out_err: |
| 1203 | return ERR_PTR(err); |
| 1204 | } |
| 1205 | EXPORT_SYMBOL(ldc_alloc); |
| 1206 | |
| 1207 | void ldc_free(struct ldc_channel *lp) |
| 1208 | { |
| 1209 | if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { |
| 1210 | free_irq(lp->cfg.rx_irq, lp); |
| 1211 | free_irq(lp->cfg.tx_irq, lp); |
| 1212 | } |
| 1213 | |
| 1214 | if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { |
| 1215 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1216 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1217 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; |
| 1218 | } |
| 1219 | if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { |
| 1220 | free_queue(lp->tx_num_entries, lp->tx_base); |
| 1221 | free_queue(lp->rx_num_entries, lp->rx_base); |
| 1222 | lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; |
| 1223 | } |
| 1224 | |
| 1225 | hlist_del(&lp->list); |
| 1226 | |
Wei Yongjun | ed247e1 | 2009-04-15 03:04:56 -0700 | [diff] [blame] | 1227 | kfree(lp->mssbuf); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1228 | |
| 1229 | ldc_iommu_release(lp); |
| 1230 | |
| 1231 | kfree(lp); |
| 1232 | } |
| 1233 | EXPORT_SYMBOL(ldc_free); |
| 1234 | |
| 1235 | /* Bind the channel. This registers the LDC queues with |
| 1236 | * the hypervisor and puts the channel into a pseudo-listening |
| 1237 | * state. This does not initiate a handshake, ldc_connect() does |
| 1238 | * that. |
| 1239 | */ |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1240 | int ldc_bind(struct ldc_channel *lp, const char *name) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1241 | { |
| 1242 | unsigned long hv_err, flags; |
| 1243 | int err = -EINVAL; |
| 1244 | |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1245 | if (!name || |
| 1246 | (lp->state != LDC_STATE_INIT)) |
| 1247 | return -EINVAL; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1248 | |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1249 | snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); |
| 1250 | snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); |
| 1251 | |
Theodore Ts'o | 71ba8d4 | 2012-07-17 14:10:26 -0400 | [diff] [blame] | 1252 | err = request_irq(lp->cfg.rx_irq, ldc_rx, IRQF_DISABLED, |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1253 | lp->rx_irq_name, lp); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1254 | if (err) |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1255 | return err; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1256 | |
Theodore Ts'o | 71ba8d4 | 2012-07-17 14:10:26 -0400 | [diff] [blame] | 1257 | err = request_irq(lp->cfg.tx_irq, ldc_tx, IRQF_DISABLED, |
David S. Miller | 133f09a | 2007-07-11 23:22:55 -0700 | [diff] [blame] | 1258 | lp->tx_irq_name, lp); |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1259 | if (err) { |
| 1260 | free_irq(lp->cfg.rx_irq, lp); |
| 1261 | return err; |
| 1262 | } |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1263 | |
| 1264 | |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1265 | spin_lock_irqsave(&lp->lock, flags); |
| 1266 | |
| 1267 | enable_irq(lp->cfg.rx_irq); |
| 1268 | enable_irq(lp->cfg.tx_irq); |
| 1269 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1270 | lp->flags |= LDC_FLAG_REGISTERED_IRQS; |
| 1271 | |
| 1272 | err = -ENODEV; |
| 1273 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1274 | if (hv_err) |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1275 | goto out_free_irqs; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1276 | |
| 1277 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
| 1278 | if (hv_err) |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1279 | goto out_free_irqs; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1280 | |
| 1281 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1282 | if (hv_err) |
| 1283 | goto out_unmap_tx; |
| 1284 | |
| 1285 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
| 1286 | if (hv_err) |
| 1287 | goto out_unmap_tx; |
| 1288 | |
| 1289 | lp->flags |= LDC_FLAG_REGISTERED_QUEUES; |
| 1290 | |
| 1291 | hv_err = sun4v_ldc_tx_get_state(lp->id, |
| 1292 | &lp->tx_head, |
| 1293 | &lp->tx_tail, |
| 1294 | &lp->chan_state); |
| 1295 | err = -EBUSY; |
| 1296 | if (hv_err) |
| 1297 | goto out_unmap_rx; |
| 1298 | |
| 1299 | lp->tx_acked = lp->tx_head; |
| 1300 | |
| 1301 | lp->hs_state = LDC_HS_OPEN; |
| 1302 | ldc_set_state(lp, LDC_STATE_BOUND); |
| 1303 | |
| 1304 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1305 | |
| 1306 | return 0; |
| 1307 | |
| 1308 | out_unmap_rx: |
| 1309 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; |
| 1310 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1311 | |
| 1312 | out_unmap_tx: |
| 1313 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1314 | |
David S. Miller | b7c2a75 | 2008-07-22 22:34:29 -0700 | [diff] [blame] | 1315 | out_free_irqs: |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1316 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
| 1317 | free_irq(lp->cfg.tx_irq, lp); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1318 | free_irq(lp->cfg.rx_irq, lp); |
| 1319 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1320 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1321 | |
| 1322 | return err; |
| 1323 | } |
| 1324 | EXPORT_SYMBOL(ldc_bind); |
| 1325 | |
| 1326 | int ldc_connect(struct ldc_channel *lp) |
| 1327 | { |
| 1328 | unsigned long flags; |
| 1329 | int err; |
| 1330 | |
| 1331 | if (lp->cfg.mode == LDC_MODE_RAW) |
| 1332 | return -EINVAL; |
| 1333 | |
| 1334 | spin_lock_irqsave(&lp->lock, flags); |
| 1335 | |
| 1336 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || |
| 1337 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) || |
| 1338 | lp->hs_state != LDC_HS_OPEN) |
| 1339 | err = -EINVAL; |
| 1340 | else |
| 1341 | err = start_handshake(lp); |
| 1342 | |
| 1343 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1344 | |
| 1345 | return err; |
| 1346 | } |
| 1347 | EXPORT_SYMBOL(ldc_connect); |
| 1348 | |
| 1349 | int ldc_disconnect(struct ldc_channel *lp) |
| 1350 | { |
| 1351 | unsigned long hv_err, flags; |
| 1352 | int err; |
| 1353 | |
| 1354 | if (lp->cfg.mode == LDC_MODE_RAW) |
| 1355 | return -EINVAL; |
| 1356 | |
| 1357 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || |
| 1358 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES)) |
| 1359 | return -EINVAL; |
| 1360 | |
| 1361 | spin_lock_irqsave(&lp->lock, flags); |
| 1362 | |
| 1363 | err = -ENODEV; |
| 1364 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1365 | if (hv_err) |
| 1366 | goto out_err; |
| 1367 | |
| 1368 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
| 1369 | if (hv_err) |
| 1370 | goto out_err; |
| 1371 | |
| 1372 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1373 | if (hv_err) |
| 1374 | goto out_err; |
| 1375 | |
| 1376 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
| 1377 | if (hv_err) |
| 1378 | goto out_err; |
| 1379 | |
| 1380 | ldc_set_state(lp, LDC_STATE_BOUND); |
| 1381 | lp->hs_state = LDC_HS_OPEN; |
| 1382 | lp->flags |= LDC_FLAG_RESET; |
| 1383 | |
| 1384 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1385 | |
| 1386 | return 0; |
| 1387 | |
| 1388 | out_err: |
| 1389 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
| 1390 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
| 1391 | free_irq(lp->cfg.tx_irq, lp); |
| 1392 | free_irq(lp->cfg.rx_irq, lp); |
| 1393 | lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS | |
| 1394 | LDC_FLAG_REGISTERED_QUEUES); |
| 1395 | ldc_set_state(lp, LDC_STATE_INIT); |
| 1396 | |
| 1397 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1398 | |
| 1399 | return err; |
| 1400 | } |
| 1401 | EXPORT_SYMBOL(ldc_disconnect); |
| 1402 | |
| 1403 | int ldc_state(struct ldc_channel *lp) |
| 1404 | { |
| 1405 | return lp->state; |
| 1406 | } |
| 1407 | EXPORT_SYMBOL(ldc_state); |
| 1408 | |
| 1409 | static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) |
| 1410 | { |
| 1411 | struct ldc_packet *p; |
| 1412 | unsigned long new_tail; |
| 1413 | int err; |
| 1414 | |
| 1415 | if (size > LDC_PACKET_SIZE) |
| 1416 | return -EMSGSIZE; |
| 1417 | |
| 1418 | p = data_get_tx_packet(lp, &new_tail); |
| 1419 | if (!p) |
| 1420 | return -EAGAIN; |
| 1421 | |
| 1422 | memcpy(p, buf, size); |
| 1423 | |
| 1424 | err = send_tx_packet(lp, p, new_tail); |
| 1425 | if (!err) |
| 1426 | err = size; |
| 1427 | |
| 1428 | return err; |
| 1429 | } |
| 1430 | |
| 1431 | static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size) |
| 1432 | { |
| 1433 | struct ldc_packet *p; |
| 1434 | unsigned long hv_err, new; |
| 1435 | int err; |
| 1436 | |
| 1437 | if (size < LDC_PACKET_SIZE) |
| 1438 | return -EINVAL; |
| 1439 | |
| 1440 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
| 1441 | &lp->rx_head, |
| 1442 | &lp->rx_tail, |
| 1443 | &lp->chan_state); |
| 1444 | if (hv_err) |
| 1445 | return ldc_abort(lp); |
| 1446 | |
| 1447 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
| 1448 | lp->chan_state == LDC_CHANNEL_RESETTING) |
| 1449 | return -ECONNRESET; |
| 1450 | |
| 1451 | if (lp->rx_head == lp->rx_tail) |
| 1452 | return 0; |
| 1453 | |
| 1454 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); |
| 1455 | memcpy(buf, p, LDC_PACKET_SIZE); |
| 1456 | |
| 1457 | new = rx_advance(lp, lp->rx_head); |
| 1458 | lp->rx_head = new; |
| 1459 | |
| 1460 | err = __set_rx_head(lp, new); |
| 1461 | if (err < 0) |
| 1462 | err = -ECONNRESET; |
| 1463 | else |
| 1464 | err = LDC_PACKET_SIZE; |
| 1465 | |
| 1466 | return err; |
| 1467 | } |
| 1468 | |
| 1469 | static const struct ldc_mode_ops raw_ops = { |
| 1470 | .write = write_raw, |
| 1471 | .read = read_raw, |
| 1472 | }; |
| 1473 | |
| 1474 | static int write_nonraw(struct ldc_channel *lp, const void *buf, |
| 1475 | unsigned int size) |
| 1476 | { |
| 1477 | unsigned long hv_err, tail; |
| 1478 | unsigned int copied; |
| 1479 | u32 seq; |
| 1480 | int err; |
| 1481 | |
| 1482 | hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, |
| 1483 | &lp->chan_state); |
| 1484 | if (unlikely(hv_err)) |
| 1485 | return -EBUSY; |
| 1486 | |
| 1487 | if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) |
| 1488 | return ldc_abort(lp); |
| 1489 | |
| 1490 | if (!tx_has_space_for(lp, size)) |
| 1491 | return -EAGAIN; |
| 1492 | |
| 1493 | seq = lp->snd_nxt; |
| 1494 | copied = 0; |
| 1495 | tail = lp->tx_tail; |
| 1496 | while (copied < size) { |
| 1497 | struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE); |
| 1498 | u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ? |
| 1499 | p->u.u_data : |
| 1500 | p->u.r.r_data); |
| 1501 | int data_len; |
| 1502 | |
| 1503 | p->type = LDC_DATA; |
| 1504 | p->stype = LDC_INFO; |
| 1505 | p->ctrl = 0; |
| 1506 | |
| 1507 | data_len = size - copied; |
| 1508 | if (data_len > lp->mss) |
| 1509 | data_len = lp->mss; |
| 1510 | |
| 1511 | BUG_ON(data_len > LDC_LEN); |
| 1512 | |
| 1513 | p->env = (data_len | |
| 1514 | (copied == 0 ? LDC_START : 0) | |
| 1515 | (data_len == size - copied ? LDC_STOP : 0)); |
| 1516 | |
| 1517 | p->seqid = ++seq; |
| 1518 | |
| 1519 | ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n", |
| 1520 | p->type, |
| 1521 | p->stype, |
| 1522 | p->ctrl, |
| 1523 | p->env, |
| 1524 | p->seqid); |
| 1525 | |
| 1526 | memcpy(data, buf, data_len); |
| 1527 | buf += data_len; |
| 1528 | copied += data_len; |
| 1529 | |
| 1530 | tail = tx_advance(lp, tail); |
| 1531 | } |
| 1532 | |
| 1533 | err = set_tx_tail(lp, tail); |
| 1534 | if (!err) { |
| 1535 | lp->snd_nxt = seq; |
| 1536 | err = size; |
| 1537 | } |
| 1538 | |
| 1539 | return err; |
| 1540 | } |
| 1541 | |
| 1542 | static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p, |
| 1543 | struct ldc_packet *first_frag) |
| 1544 | { |
| 1545 | int err; |
| 1546 | |
| 1547 | if (first_frag) |
| 1548 | lp->rcv_nxt = first_frag->seqid - 1; |
| 1549 | |
| 1550 | err = send_data_nack(lp, p); |
| 1551 | if (err) |
| 1552 | return err; |
| 1553 | |
| 1554 | err = __set_rx_head(lp, lp->rx_tail); |
| 1555 | if (err < 0) |
| 1556 | return ldc_abort(lp); |
| 1557 | |
| 1558 | return 0; |
| 1559 | } |
| 1560 | |
| 1561 | static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p) |
| 1562 | { |
| 1563 | if (p->stype & LDC_ACK) { |
| 1564 | int err = process_data_ack(lp, p); |
| 1565 | if (err) |
| 1566 | return err; |
| 1567 | } |
| 1568 | if (p->stype & LDC_NACK) |
| 1569 | return ldc_abort(lp); |
| 1570 | |
| 1571 | return 0; |
| 1572 | } |
| 1573 | |
| 1574 | static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head) |
| 1575 | { |
| 1576 | unsigned long dummy; |
| 1577 | int limit = 1000; |
| 1578 | |
| 1579 | ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n", |
| 1580 | cur_head, lp->rx_head, lp->rx_tail); |
| 1581 | while (limit-- > 0) { |
| 1582 | unsigned long hv_err; |
| 1583 | |
| 1584 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
| 1585 | &dummy, |
| 1586 | &lp->rx_tail, |
| 1587 | &lp->chan_state); |
| 1588 | if (hv_err) |
| 1589 | return ldc_abort(lp); |
| 1590 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1591 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
| 1592 | lp->chan_state == LDC_CHANNEL_RESETTING) |
| 1593 | return -ECONNRESET; |
| 1594 | |
| 1595 | if (cur_head != lp->rx_tail) { |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1596 | ldcdbg(DATA, "DATA WAIT DONE " |
| 1597 | "head[%lx] tail[%lx] chan_state[%lx]\n", |
| 1598 | dummy, lp->rx_tail, lp->chan_state); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1599 | return 0; |
| 1600 | } |
| 1601 | |
| 1602 | udelay(1); |
| 1603 | } |
| 1604 | return -EAGAIN; |
| 1605 | } |
| 1606 | |
| 1607 | static int rx_set_head(struct ldc_channel *lp, unsigned long head) |
| 1608 | { |
| 1609 | int err = __set_rx_head(lp, head); |
| 1610 | |
| 1611 | if (err < 0) |
| 1612 | return ldc_abort(lp); |
| 1613 | |
| 1614 | lp->rx_head = head; |
| 1615 | return 0; |
| 1616 | } |
| 1617 | |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1618 | static void send_data_ack(struct ldc_channel *lp) |
| 1619 | { |
| 1620 | unsigned long new_tail; |
| 1621 | struct ldc_packet *p; |
| 1622 | |
| 1623 | p = data_get_tx_packet(lp, &new_tail); |
| 1624 | if (likely(p)) { |
| 1625 | int err; |
| 1626 | |
| 1627 | memset(p, 0, sizeof(*p)); |
| 1628 | p->type = LDC_DATA; |
| 1629 | p->stype = LDC_ACK; |
| 1630 | p->ctrl = 0; |
| 1631 | p->seqid = lp->snd_nxt + 1; |
| 1632 | p->u.r.ackid = lp->rcv_nxt; |
| 1633 | |
| 1634 | err = send_tx_packet(lp, p, new_tail); |
| 1635 | if (!err) |
| 1636 | lp->snd_nxt++; |
| 1637 | } |
| 1638 | } |
| 1639 | |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1640 | static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size) |
| 1641 | { |
| 1642 | struct ldc_packet *first_frag; |
| 1643 | unsigned long hv_err, new; |
| 1644 | int err, copied; |
| 1645 | |
| 1646 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
| 1647 | &lp->rx_head, |
| 1648 | &lp->rx_tail, |
| 1649 | &lp->chan_state); |
| 1650 | if (hv_err) |
| 1651 | return ldc_abort(lp); |
| 1652 | |
| 1653 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
| 1654 | lp->chan_state == LDC_CHANNEL_RESETTING) |
| 1655 | return -ECONNRESET; |
| 1656 | |
| 1657 | if (lp->rx_head == lp->rx_tail) |
| 1658 | return 0; |
| 1659 | |
| 1660 | first_frag = NULL; |
| 1661 | copied = err = 0; |
| 1662 | new = lp->rx_head; |
| 1663 | while (1) { |
| 1664 | struct ldc_packet *p; |
| 1665 | int pkt_len; |
| 1666 | |
| 1667 | BUG_ON(new == lp->rx_tail); |
| 1668 | p = lp->rx_base + (new / LDC_PACKET_SIZE); |
| 1669 | |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1670 | ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1671 | "rcv_nxt[%08x]\n", |
| 1672 | p->type, |
| 1673 | p->stype, |
| 1674 | p->ctrl, |
| 1675 | p->env, |
| 1676 | p->seqid, |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1677 | p->u.r.ackid, |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1678 | lp->rcv_nxt); |
| 1679 | |
| 1680 | if (unlikely(!rx_seq_ok(lp, p->seqid))) { |
| 1681 | err = rx_bad_seq(lp, p, first_frag); |
| 1682 | copied = 0; |
| 1683 | break; |
| 1684 | } |
| 1685 | |
| 1686 | if (p->type & LDC_CTRL) { |
| 1687 | err = process_control_frame(lp, p); |
| 1688 | if (err < 0) |
| 1689 | break; |
| 1690 | err = 0; |
| 1691 | } |
| 1692 | |
| 1693 | lp->rcv_nxt = p->seqid; |
| 1694 | |
| 1695 | if (!(p->type & LDC_DATA)) { |
| 1696 | new = rx_advance(lp, new); |
| 1697 | goto no_data; |
| 1698 | } |
| 1699 | if (p->stype & (LDC_ACK | LDC_NACK)) { |
| 1700 | err = data_ack_nack(lp, p); |
| 1701 | if (err) |
| 1702 | break; |
| 1703 | } |
| 1704 | if (!(p->stype & LDC_INFO)) { |
| 1705 | new = rx_advance(lp, new); |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1706 | err = rx_set_head(lp, new); |
| 1707 | if (err) |
| 1708 | break; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1709 | goto no_data; |
| 1710 | } |
| 1711 | |
| 1712 | pkt_len = p->env & LDC_LEN; |
| 1713 | |
| 1714 | /* Every initial packet starts with the START bit set. |
| 1715 | * |
| 1716 | * Singleton packets will have both START+STOP set. |
| 1717 | * |
| 1718 | * Fragments will have START set in the first frame, STOP |
| 1719 | * set in the last frame, and neither bit set in middle |
| 1720 | * frames of the packet. |
| 1721 | * |
| 1722 | * Therefore if we are at the beginning of a packet and |
| 1723 | * we don't see START, or we are in the middle of a fragmented |
| 1724 | * packet and do see START, we are unsynchronized and should |
| 1725 | * flush the RX queue. |
| 1726 | */ |
| 1727 | if ((first_frag == NULL && !(p->env & LDC_START)) || |
| 1728 | (first_frag != NULL && (p->env & LDC_START))) { |
| 1729 | if (!first_frag) |
| 1730 | new = rx_advance(lp, new); |
| 1731 | |
| 1732 | err = rx_set_head(lp, new); |
| 1733 | if (err) |
| 1734 | break; |
| 1735 | |
| 1736 | if (!first_frag) |
| 1737 | goto no_data; |
| 1738 | } |
| 1739 | if (!first_frag) |
| 1740 | first_frag = p; |
| 1741 | |
| 1742 | if (pkt_len > size - copied) { |
| 1743 | /* User didn't give us a big enough buffer, |
| 1744 | * what to do? This is a pretty serious error. |
| 1745 | * |
| 1746 | * Since we haven't updated the RX ring head to |
| 1747 | * consume any of the packets, signal the error |
| 1748 | * to the user and just leave the RX ring alone. |
| 1749 | * |
| 1750 | * This seems the best behavior because this allows |
| 1751 | * a user of the LDC layer to start with a small |
| 1752 | * RX buffer for ldc_read() calls and use -EMSGSIZE |
| 1753 | * as a cue to enlarge it's read buffer. |
| 1754 | */ |
| 1755 | err = -EMSGSIZE; |
| 1756 | break; |
| 1757 | } |
| 1758 | |
| 1759 | /* Ok, we are gonna eat this one. */ |
| 1760 | new = rx_advance(lp, new); |
| 1761 | |
| 1762 | memcpy(buf, |
| 1763 | (lp->cfg.mode == LDC_MODE_UNRELIABLE ? |
| 1764 | p->u.u_data : p->u.r.r_data), pkt_len); |
| 1765 | buf += pkt_len; |
| 1766 | copied += pkt_len; |
| 1767 | |
| 1768 | if (p->env & LDC_STOP) |
| 1769 | break; |
| 1770 | |
| 1771 | no_data: |
| 1772 | if (new == lp->rx_tail) { |
| 1773 | err = rx_data_wait(lp, new); |
| 1774 | if (err) |
| 1775 | break; |
| 1776 | } |
| 1777 | } |
| 1778 | |
| 1779 | if (!err) |
| 1780 | err = rx_set_head(lp, new); |
| 1781 | |
| 1782 | if (err && first_frag) |
| 1783 | lp->rcv_nxt = first_frag->seqid - 1; |
| 1784 | |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1785 | if (!err) { |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1786 | err = copied; |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1787 | if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) |
| 1788 | send_data_ack(lp); |
| 1789 | } |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1790 | |
| 1791 | return err; |
| 1792 | } |
| 1793 | |
| 1794 | static const struct ldc_mode_ops nonraw_ops = { |
| 1795 | .write = write_nonraw, |
| 1796 | .read = read_nonraw, |
| 1797 | }; |
| 1798 | |
| 1799 | static int write_stream(struct ldc_channel *lp, const void *buf, |
| 1800 | unsigned int size) |
| 1801 | { |
| 1802 | if (size > lp->cfg.mtu) |
| 1803 | size = lp->cfg.mtu; |
| 1804 | return write_nonraw(lp, buf, size); |
| 1805 | } |
| 1806 | |
| 1807 | static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size) |
| 1808 | { |
| 1809 | if (!lp->mssbuf_len) { |
David S. Miller | cb48123 | 2007-07-11 18:14:41 -0700 | [diff] [blame] | 1810 | int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1811 | if (err < 0) |
| 1812 | return err; |
| 1813 | |
| 1814 | lp->mssbuf_len = err; |
| 1815 | lp->mssbuf_off = 0; |
| 1816 | } |
| 1817 | |
| 1818 | if (size > lp->mssbuf_len) |
| 1819 | size = lp->mssbuf_len; |
| 1820 | memcpy(buf, lp->mssbuf + lp->mssbuf_off, size); |
| 1821 | |
| 1822 | lp->mssbuf_off += size; |
| 1823 | lp->mssbuf_len -= size; |
| 1824 | |
| 1825 | return size; |
| 1826 | } |
| 1827 | |
| 1828 | static const struct ldc_mode_ops stream_ops = { |
| 1829 | .write = write_stream, |
| 1830 | .read = read_stream, |
| 1831 | }; |
| 1832 | |
| 1833 | int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size) |
| 1834 | { |
| 1835 | unsigned long flags; |
| 1836 | int err; |
| 1837 | |
| 1838 | if (!buf) |
| 1839 | return -EINVAL; |
| 1840 | |
| 1841 | if (!size) |
| 1842 | return 0; |
| 1843 | |
| 1844 | spin_lock_irqsave(&lp->lock, flags); |
| 1845 | |
| 1846 | if (lp->hs_state != LDC_HS_COMPLETE) |
| 1847 | err = -ENOTCONN; |
| 1848 | else |
| 1849 | err = lp->mops->write(lp, buf, size); |
| 1850 | |
| 1851 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1852 | |
| 1853 | return err; |
| 1854 | } |
| 1855 | EXPORT_SYMBOL(ldc_write); |
| 1856 | |
| 1857 | int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size) |
| 1858 | { |
| 1859 | unsigned long flags; |
| 1860 | int err; |
| 1861 | |
| 1862 | if (!buf) |
| 1863 | return -EINVAL; |
| 1864 | |
| 1865 | if (!size) |
| 1866 | return 0; |
| 1867 | |
| 1868 | spin_lock_irqsave(&lp->lock, flags); |
| 1869 | |
| 1870 | if (lp->hs_state != LDC_HS_COMPLETE) |
| 1871 | err = -ENOTCONN; |
| 1872 | else |
| 1873 | err = lp->mops->read(lp, buf, size); |
| 1874 | |
| 1875 | spin_unlock_irqrestore(&lp->lock, flags); |
| 1876 | |
| 1877 | return err; |
| 1878 | } |
| 1879 | EXPORT_SYMBOL(ldc_read); |
| 1880 | |
| 1881 | static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages) |
| 1882 | { |
| 1883 | struct iommu_arena *arena = &iommu->arena; |
Akinobu Mita | e756fd8 | 2009-12-15 16:48:30 -0800 | [diff] [blame] | 1884 | unsigned long n, start, end, limit; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1885 | int pass; |
| 1886 | |
| 1887 | limit = arena->limit; |
| 1888 | start = arena->hint; |
| 1889 | pass = 0; |
| 1890 | |
| 1891 | again: |
Akinobu Mita | e756fd8 | 2009-12-15 16:48:30 -0800 | [diff] [blame] | 1892 | n = bitmap_find_next_zero_area(arena->map, limit, start, npages, 0); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1893 | end = n + npages; |
| 1894 | if (unlikely(end >= limit)) { |
| 1895 | if (likely(pass < 1)) { |
| 1896 | limit = start; |
| 1897 | start = 0; |
| 1898 | pass++; |
| 1899 | goto again; |
| 1900 | } else { |
| 1901 | /* Scanned the whole thing, give up. */ |
| 1902 | return -1; |
| 1903 | } |
| 1904 | } |
Akinobu Mita | e756fd8 | 2009-12-15 16:48:30 -0800 | [diff] [blame] | 1905 | bitmap_set(arena->map, n, npages); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 1906 | |
| 1907 | arena->hint = end; |
| 1908 | |
| 1909 | return n; |
| 1910 | } |
| 1911 | |
| 1912 | #define COOKIE_PGSZ_CODE 0xf000000000000000ULL |
| 1913 | #define COOKIE_PGSZ_CODE_SHIFT 60ULL |
| 1914 | |
| 1915 | static u64 pagesize_code(void) |
| 1916 | { |
| 1917 | switch (PAGE_SIZE) { |
| 1918 | default: |
| 1919 | case (8ULL * 1024ULL): |
| 1920 | return 0; |
| 1921 | case (64ULL * 1024ULL): |
| 1922 | return 1; |
| 1923 | case (512ULL * 1024ULL): |
| 1924 | return 2; |
| 1925 | case (4ULL * 1024ULL * 1024ULL): |
| 1926 | return 3; |
| 1927 | case (32ULL * 1024ULL * 1024ULL): |
| 1928 | return 4; |
| 1929 | case (256ULL * 1024ULL * 1024ULL): |
| 1930 | return 5; |
| 1931 | } |
| 1932 | } |
| 1933 | |
| 1934 | static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) |
| 1935 | { |
| 1936 | return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | |
| 1937 | (index << PAGE_SHIFT) | |
| 1938 | page_offset); |
| 1939 | } |
| 1940 | |
| 1941 | static u64 cookie_to_index(u64 cookie, unsigned long *shift) |
| 1942 | { |
| 1943 | u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; |
| 1944 | |
| 1945 | cookie &= ~COOKIE_PGSZ_CODE; |
| 1946 | |
| 1947 | *shift = szcode * 3; |
| 1948 | |
| 1949 | return (cookie >> (13ULL + (szcode * 3ULL))); |
| 1950 | } |
| 1951 | |
| 1952 | static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, |
| 1953 | unsigned long npages) |
| 1954 | { |
| 1955 | long entry; |
| 1956 | |
| 1957 | entry = arena_alloc(iommu, npages); |
| 1958 | if (unlikely(entry < 0)) |
| 1959 | return NULL; |
| 1960 | |
| 1961 | return iommu->page_table + entry; |
| 1962 | } |
| 1963 | |
| 1964 | static u64 perm_to_mte(unsigned int map_perm) |
| 1965 | { |
| 1966 | u64 mte_base; |
| 1967 | |
| 1968 | mte_base = pagesize_code(); |
| 1969 | |
| 1970 | if (map_perm & LDC_MAP_SHADOW) { |
| 1971 | if (map_perm & LDC_MAP_R) |
| 1972 | mte_base |= LDC_MTE_COPY_R; |
| 1973 | if (map_perm & LDC_MAP_W) |
| 1974 | mte_base |= LDC_MTE_COPY_W; |
| 1975 | } |
| 1976 | if (map_perm & LDC_MAP_DIRECT) { |
| 1977 | if (map_perm & LDC_MAP_R) |
| 1978 | mte_base |= LDC_MTE_READ; |
| 1979 | if (map_perm & LDC_MAP_W) |
| 1980 | mte_base |= LDC_MTE_WRITE; |
| 1981 | if (map_perm & LDC_MAP_X) |
| 1982 | mte_base |= LDC_MTE_EXEC; |
| 1983 | } |
| 1984 | if (map_perm & LDC_MAP_IO) { |
| 1985 | if (map_perm & LDC_MAP_R) |
| 1986 | mte_base |= LDC_MTE_IOMMU_R; |
| 1987 | if (map_perm & LDC_MAP_W) |
| 1988 | mte_base |= LDC_MTE_IOMMU_W; |
| 1989 | } |
| 1990 | |
| 1991 | return mte_base; |
| 1992 | } |
| 1993 | |
| 1994 | static int pages_in_region(unsigned long base, long len) |
| 1995 | { |
| 1996 | int count = 0; |
| 1997 | |
| 1998 | do { |
| 1999 | unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; |
| 2000 | |
| 2001 | len -= (new - base); |
| 2002 | base = new; |
| 2003 | count++; |
| 2004 | } while (len > 0); |
| 2005 | |
| 2006 | return count; |
| 2007 | } |
| 2008 | |
| 2009 | struct cookie_state { |
| 2010 | struct ldc_mtable_entry *page_table; |
| 2011 | struct ldc_trans_cookie *cookies; |
| 2012 | u64 mte_base; |
| 2013 | u64 prev_cookie; |
| 2014 | u32 pte_idx; |
| 2015 | u32 nc; |
| 2016 | }; |
| 2017 | |
| 2018 | static void fill_cookies(struct cookie_state *sp, unsigned long pa, |
| 2019 | unsigned long off, unsigned long len) |
| 2020 | { |
| 2021 | do { |
| 2022 | unsigned long tlen, new = pa + PAGE_SIZE; |
| 2023 | u64 this_cookie; |
| 2024 | |
| 2025 | sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; |
| 2026 | |
| 2027 | tlen = PAGE_SIZE; |
| 2028 | if (off) |
| 2029 | tlen = PAGE_SIZE - off; |
| 2030 | if (tlen > len) |
| 2031 | tlen = len; |
| 2032 | |
| 2033 | this_cookie = make_cookie(sp->pte_idx, |
| 2034 | pagesize_code(), off); |
| 2035 | |
| 2036 | off = 0; |
| 2037 | |
| 2038 | if (this_cookie == sp->prev_cookie) { |
| 2039 | sp->cookies[sp->nc - 1].cookie_size += tlen; |
| 2040 | } else { |
| 2041 | sp->cookies[sp->nc].cookie_addr = this_cookie; |
| 2042 | sp->cookies[sp->nc].cookie_size = tlen; |
| 2043 | sp->nc++; |
| 2044 | } |
| 2045 | sp->prev_cookie = this_cookie + tlen; |
| 2046 | |
| 2047 | sp->pte_idx++; |
| 2048 | |
| 2049 | len -= tlen; |
| 2050 | pa = new; |
| 2051 | } while (len > 0); |
| 2052 | } |
| 2053 | |
| 2054 | static int sg_count_one(struct scatterlist *sg) |
| 2055 | { |
Jens Axboe | 58b053e | 2007-10-22 20:02:46 +0200 | [diff] [blame] | 2056 | unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2057 | long len = sg->length; |
| 2058 | |
| 2059 | if ((sg->offset | len) & (8UL - 1)) |
| 2060 | return -EFAULT; |
| 2061 | |
| 2062 | return pages_in_region(base + sg->offset, len); |
| 2063 | } |
| 2064 | |
| 2065 | static int sg_count_pages(struct scatterlist *sg, int num_sg) |
| 2066 | { |
| 2067 | int count; |
| 2068 | int i; |
| 2069 | |
| 2070 | count = 0; |
| 2071 | for (i = 0; i < num_sg; i++) { |
| 2072 | int err = sg_count_one(sg + i); |
| 2073 | if (err < 0) |
| 2074 | return err; |
| 2075 | count += err; |
| 2076 | } |
| 2077 | |
| 2078 | return count; |
| 2079 | } |
| 2080 | |
| 2081 | int ldc_map_sg(struct ldc_channel *lp, |
| 2082 | struct scatterlist *sg, int num_sg, |
| 2083 | struct ldc_trans_cookie *cookies, int ncookies, |
| 2084 | unsigned int map_perm) |
| 2085 | { |
| 2086 | unsigned long i, npages, flags; |
| 2087 | struct ldc_mtable_entry *base; |
| 2088 | struct cookie_state state; |
| 2089 | struct ldc_iommu *iommu; |
| 2090 | int err; |
| 2091 | |
| 2092 | if (map_perm & ~LDC_MAP_ALL) |
| 2093 | return -EINVAL; |
| 2094 | |
| 2095 | err = sg_count_pages(sg, num_sg); |
| 2096 | if (err < 0) |
| 2097 | return err; |
| 2098 | |
| 2099 | npages = err; |
| 2100 | if (err > ncookies) |
| 2101 | return -EMSGSIZE; |
| 2102 | |
| 2103 | iommu = &lp->iommu; |
| 2104 | |
| 2105 | spin_lock_irqsave(&iommu->lock, flags); |
| 2106 | base = alloc_npages(iommu, npages); |
| 2107 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 2108 | |
| 2109 | if (!base) |
| 2110 | return -ENOMEM; |
| 2111 | |
| 2112 | state.page_table = iommu->page_table; |
| 2113 | state.cookies = cookies; |
| 2114 | state.mte_base = perm_to_mte(map_perm); |
| 2115 | state.prev_cookie = ~(u64)0; |
| 2116 | state.pte_idx = (base - iommu->page_table); |
| 2117 | state.nc = 0; |
| 2118 | |
| 2119 | for (i = 0; i < num_sg; i++) |
David Miller | d91c5e8 | 2007-10-24 08:46:01 +0200 | [diff] [blame] | 2120 | 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] | 2121 | sg[i].offset, sg[i].length); |
| 2122 | |
| 2123 | return state.nc; |
| 2124 | } |
| 2125 | EXPORT_SYMBOL(ldc_map_sg); |
| 2126 | |
| 2127 | int ldc_map_single(struct ldc_channel *lp, |
| 2128 | void *buf, unsigned int len, |
| 2129 | struct ldc_trans_cookie *cookies, int ncookies, |
| 2130 | unsigned int map_perm) |
| 2131 | { |
| 2132 | unsigned long npages, pa, flags; |
| 2133 | struct ldc_mtable_entry *base; |
| 2134 | struct cookie_state state; |
| 2135 | struct ldc_iommu *iommu; |
| 2136 | |
| 2137 | if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) |
| 2138 | return -EINVAL; |
| 2139 | |
| 2140 | pa = __pa(buf); |
| 2141 | if ((pa | len) & (8UL - 1)) |
| 2142 | return -EFAULT; |
| 2143 | |
| 2144 | npages = pages_in_region(pa, len); |
| 2145 | |
| 2146 | iommu = &lp->iommu; |
| 2147 | |
| 2148 | spin_lock_irqsave(&iommu->lock, flags); |
| 2149 | base = alloc_npages(iommu, npages); |
| 2150 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 2151 | |
| 2152 | if (!base) |
| 2153 | return -ENOMEM; |
| 2154 | |
| 2155 | state.page_table = iommu->page_table; |
| 2156 | state.cookies = cookies; |
| 2157 | state.mte_base = perm_to_mte(map_perm); |
| 2158 | state.prev_cookie = ~(u64)0; |
| 2159 | state.pte_idx = (base - iommu->page_table); |
| 2160 | state.nc = 0; |
| 2161 | fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); |
| 2162 | BUG_ON(state.nc != 1); |
| 2163 | |
| 2164 | return state.nc; |
| 2165 | } |
| 2166 | EXPORT_SYMBOL(ldc_map_single); |
| 2167 | |
| 2168 | static void free_npages(unsigned long id, struct ldc_iommu *iommu, |
| 2169 | u64 cookie, u64 size) |
| 2170 | { |
| 2171 | struct iommu_arena *arena = &iommu->arena; |
| 2172 | unsigned long i, shift, index, npages; |
| 2173 | struct ldc_mtable_entry *base; |
| 2174 | |
| 2175 | npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; |
| 2176 | index = cookie_to_index(cookie, &shift); |
| 2177 | base = iommu->page_table + index; |
| 2178 | |
| 2179 | BUG_ON(index > arena->limit || |
| 2180 | (index + npages) > arena->limit); |
| 2181 | |
| 2182 | for (i = 0; i < npages; i++) { |
| 2183 | if (base->cookie) |
| 2184 | sun4v_ldc_revoke(id, cookie + (i << shift), |
| 2185 | base->cookie); |
| 2186 | base->mte = 0; |
| 2187 | __clear_bit(index + i, arena->map); |
| 2188 | } |
| 2189 | } |
| 2190 | |
| 2191 | void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, |
| 2192 | int ncookies) |
| 2193 | { |
| 2194 | struct ldc_iommu *iommu = &lp->iommu; |
| 2195 | unsigned long flags; |
| 2196 | int i; |
| 2197 | |
| 2198 | spin_lock_irqsave(&iommu->lock, flags); |
| 2199 | for (i = 0; i < ncookies; i++) { |
| 2200 | u64 addr = cookies[i].cookie_addr; |
| 2201 | u64 size = cookies[i].cookie_size; |
| 2202 | |
| 2203 | free_npages(lp->id, iommu, addr, size); |
| 2204 | } |
| 2205 | spin_unlock_irqrestore(&iommu->lock, flags); |
| 2206 | } |
| 2207 | EXPORT_SYMBOL(ldc_unmap); |
| 2208 | |
| 2209 | int ldc_copy(struct ldc_channel *lp, int copy_dir, |
| 2210 | void *buf, unsigned int len, unsigned long offset, |
| 2211 | struct ldc_trans_cookie *cookies, int ncookies) |
| 2212 | { |
| 2213 | unsigned int orig_len; |
| 2214 | unsigned long ra; |
| 2215 | int i; |
| 2216 | |
| 2217 | if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { |
| 2218 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n", |
| 2219 | lp->id, copy_dir); |
| 2220 | return -EINVAL; |
| 2221 | } |
| 2222 | |
| 2223 | ra = __pa(buf); |
| 2224 | if ((ra | len | offset) & (8UL - 1)) { |
| 2225 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " |
| 2226 | "ra[%lx] len[%x] offset[%lx]\n", |
| 2227 | lp->id, ra, len, offset); |
| 2228 | return -EFAULT; |
| 2229 | } |
| 2230 | |
| 2231 | if (lp->hs_state != LDC_HS_COMPLETE || |
| 2232 | (lp->flags & LDC_FLAG_RESET)) { |
| 2233 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " |
| 2234 | "flags[%x]\n", lp->id, lp->hs_state, lp->flags); |
| 2235 | return -ECONNRESET; |
| 2236 | } |
| 2237 | |
| 2238 | orig_len = len; |
| 2239 | for (i = 0; i < ncookies; i++) { |
| 2240 | unsigned long cookie_raddr = cookies[i].cookie_addr; |
| 2241 | unsigned long this_len = cookies[i].cookie_size; |
| 2242 | unsigned long actual_len; |
| 2243 | |
| 2244 | if (unlikely(offset)) { |
| 2245 | unsigned long this_off = offset; |
| 2246 | |
| 2247 | if (this_off > this_len) |
| 2248 | this_off = this_len; |
| 2249 | |
| 2250 | offset -= this_off; |
| 2251 | this_len -= this_off; |
| 2252 | if (!this_len) |
| 2253 | continue; |
| 2254 | cookie_raddr += this_off; |
| 2255 | } |
| 2256 | |
| 2257 | if (this_len > len) |
| 2258 | this_len = len; |
| 2259 | |
| 2260 | while (1) { |
| 2261 | unsigned long hv_err; |
| 2262 | |
| 2263 | hv_err = sun4v_ldc_copy(lp->id, copy_dir, |
| 2264 | cookie_raddr, ra, |
| 2265 | this_len, &actual_len); |
| 2266 | if (unlikely(hv_err)) { |
| 2267 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] " |
| 2268 | "HV error %lu\n", |
| 2269 | lp->id, hv_err); |
| 2270 | if (lp->hs_state != LDC_HS_COMPLETE || |
| 2271 | (lp->flags & LDC_FLAG_RESET)) |
| 2272 | return -ECONNRESET; |
| 2273 | else |
| 2274 | return -EFAULT; |
| 2275 | } |
| 2276 | |
| 2277 | cookie_raddr += actual_len; |
| 2278 | ra += actual_len; |
| 2279 | len -= actual_len; |
| 2280 | if (actual_len == this_len) |
| 2281 | break; |
| 2282 | |
| 2283 | this_len -= actual_len; |
| 2284 | } |
| 2285 | |
| 2286 | if (!len) |
| 2287 | break; |
| 2288 | } |
| 2289 | |
| 2290 | /* It is caller policy what to do about short copies. |
| 2291 | * For example, a networking driver can declare the |
| 2292 | * packet a runt and drop it. |
| 2293 | */ |
| 2294 | |
| 2295 | return orig_len - len; |
| 2296 | } |
| 2297 | EXPORT_SYMBOL(ldc_copy); |
| 2298 | |
| 2299 | void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, |
| 2300 | struct ldc_trans_cookie *cookies, int *ncookies, |
| 2301 | unsigned int map_perm) |
| 2302 | { |
| 2303 | void *buf; |
| 2304 | int err; |
| 2305 | |
| 2306 | if (len & (8UL - 1)) |
| 2307 | return ERR_PTR(-EINVAL); |
| 2308 | |
| 2309 | buf = kzalloc(len, GFP_KERNEL); |
| 2310 | if (!buf) |
| 2311 | return ERR_PTR(-ENOMEM); |
| 2312 | |
| 2313 | err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); |
| 2314 | if (err < 0) { |
| 2315 | kfree(buf); |
| 2316 | return ERR_PTR(err); |
| 2317 | } |
| 2318 | *ncookies = err; |
| 2319 | |
| 2320 | return buf; |
| 2321 | } |
| 2322 | EXPORT_SYMBOL(ldc_alloc_exp_dring); |
| 2323 | |
| 2324 | void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, |
| 2325 | struct ldc_trans_cookie *cookies, int ncookies) |
| 2326 | { |
| 2327 | ldc_unmap(lp, cookies, ncookies); |
| 2328 | kfree(buf); |
| 2329 | } |
| 2330 | EXPORT_SYMBOL(ldc_free_exp_dring); |
| 2331 | |
| 2332 | static int __init ldc_init(void) |
| 2333 | { |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2334 | unsigned long major, minor; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2335 | struct mdesc_handle *hp; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2336 | const u64 *v; |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2337 | int err; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2338 | u64 mp; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2339 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2340 | hp = mdesc_grab(); |
| 2341 | if (!hp) |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2342 | return -ENODEV; |
| 2343 | |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2344 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2345 | err = -ENODEV; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2346 | if (mp == MDESC_NODE_NULL) |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2347 | goto out; |
David S. Miller | 43fdf27 | 2007-07-12 13:47:50 -0700 | [diff] [blame] | 2348 | |
| 2349 | v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2350 | if (!v) |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2351 | goto out; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2352 | |
| 2353 | major = 1; |
| 2354 | minor = 0; |
| 2355 | if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { |
| 2356 | printk(KERN_INFO PFX "Could not register LDOM hvapi.\n"); |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2357 | goto out; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2358 | } |
| 2359 | |
| 2360 | printk(KERN_INFO "%s", version); |
| 2361 | |
| 2362 | if (!*v) { |
| 2363 | printk(KERN_INFO PFX "Domaining disabled.\n"); |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2364 | goto out; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2365 | } |
| 2366 | ldom_domaining_enabled = 1; |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2367 | err = 0; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2368 | |
David S. Miller | 6fab260 | 2007-11-14 20:17:24 -0800 | [diff] [blame] | 2369 | out: |
| 2370 | mdesc_release(hp); |
| 2371 | return err; |
David S. Miller | e53e97c | 2007-07-09 22:22:44 -0700 | [diff] [blame] | 2372 | } |
| 2373 | |
| 2374 | core_initcall(ldc_init); |