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e53e97ce DM |
1 | /* ldc.c: Logical Domain Channel link-layer protocol driver. |
2 | * | |
b7c2a757 | 3 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
e53e97ce DM |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
066bcaca | 7 | #include <linux/export.h> |
e53e97ce DM |
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> | |
e756fd80 | 17 | #include <linux/bitmap.h> |
0ae53ed1 | 18 | #include <linux/iommu-common.h> |
e53e97ce DM |
19 | |
20 | #include <asm/hypervisor.h> | |
21 | #include <asm/iommu.h> | |
22 | #include <asm/page.h> | |
23 | #include <asm/ldc.h> | |
24 | #include <asm/mdesc.h> | |
25 | ||
26 | #define DRV_MODULE_NAME "ldc" | |
27 | #define PFX DRV_MODULE_NAME ": " | |
b7c2a757 DM |
28 | #define DRV_MODULE_VERSION "1.1" |
29 | #define DRV_MODULE_RELDATE "July 22, 2008" | |
e53e97ce | 30 | |
0ae53ed1 SV |
31 | #define COOKIE_PGSZ_CODE 0xf000000000000000ULL |
32 | #define COOKIE_PGSZ_CODE_SHIFT 60ULL | |
33 | ||
34 | ||
7c9503b8 | 35 | static char version[] = |
e53e97ce DM |
36 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
37 | #define LDC_PACKET_SIZE 64 | |
38 | ||
39 | /* Packet header layout for unreliable and reliable mode frames. | |
40 | * When in RAW mode, packets are simply straight 64-byte payloads | |
41 | * with no headers. | |
42 | */ | |
43 | struct ldc_packet { | |
44 | u8 type; | |
45 | #define LDC_CTRL 0x01 | |
46 | #define LDC_DATA 0x02 | |
47 | #define LDC_ERR 0x10 | |
48 | ||
49 | u8 stype; | |
50 | #define LDC_INFO 0x01 | |
51 | #define LDC_ACK 0x02 | |
52 | #define LDC_NACK 0x04 | |
53 | ||
54 | u8 ctrl; | |
55 | #define LDC_VERS 0x01 /* Link Version */ | |
56 | #define LDC_RTS 0x02 /* Request To Send */ | |
57 | #define LDC_RTR 0x03 /* Ready To Receive */ | |
58 | #define LDC_RDX 0x04 /* Ready for Data eXchange */ | |
59 | #define LDC_CTRL_MSK 0x0f | |
60 | ||
61 | u8 env; | |
62 | #define LDC_LEN 0x3f | |
63 | #define LDC_FRAG_MASK 0xc0 | |
64 | #define LDC_START 0x40 | |
65 | #define LDC_STOP 0x80 | |
66 | ||
67 | u32 seqid; | |
68 | ||
69 | union { | |
70 | u8 u_data[LDC_PACKET_SIZE - 8]; | |
71 | struct { | |
72 | u32 pad; | |
73 | u32 ackid; | |
74 | u8 r_data[LDC_PACKET_SIZE - 8 - 8]; | |
75 | } r; | |
76 | } u; | |
77 | }; | |
78 | ||
79 | struct ldc_version { | |
80 | u16 major; | |
81 | u16 minor; | |
82 | }; | |
83 | ||
84 | /* Ordered from largest major to lowest. */ | |
85 | static struct ldc_version ver_arr[] = { | |
86 | { .major = 1, .minor = 0 }, | |
87 | }; | |
88 | ||
89 | #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE) | |
90 | #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE) | |
91 | ||
92 | struct ldc_channel; | |
93 | ||
94 | struct ldc_mode_ops { | |
95 | int (*write)(struct ldc_channel *, const void *, unsigned int); | |
96 | int (*read)(struct ldc_channel *, void *, unsigned int); | |
97 | }; | |
98 | ||
99 | static const struct ldc_mode_ops raw_ops; | |
100 | static const struct ldc_mode_ops nonraw_ops; | |
101 | static const struct ldc_mode_ops stream_ops; | |
102 | ||
103 | int ldom_domaining_enabled; | |
104 | ||
105 | struct ldc_iommu { | |
0ae53ed1 | 106 | /* Protects ldc_unmap. */ |
e53e97ce | 107 | spinlock_t lock; |
e53e97ce | 108 | struct ldc_mtable_entry *page_table; |
0ae53ed1 | 109 | struct iommu_map_table iommu_map_table; |
e53e97ce DM |
110 | }; |
111 | ||
112 | struct ldc_channel { | |
113 | /* Protects all operations that depend upon channel state. */ | |
114 | spinlock_t lock; | |
115 | ||
116 | unsigned long id; | |
117 | ||
118 | u8 *mssbuf; | |
119 | u32 mssbuf_len; | |
120 | u32 mssbuf_off; | |
121 | ||
122 | struct ldc_packet *tx_base; | |
123 | unsigned long tx_head; | |
124 | unsigned long tx_tail; | |
125 | unsigned long tx_num_entries; | |
126 | unsigned long tx_ra; | |
127 | ||
128 | unsigned long tx_acked; | |
129 | ||
130 | struct ldc_packet *rx_base; | |
131 | unsigned long rx_head; | |
132 | unsigned long rx_tail; | |
133 | unsigned long rx_num_entries; | |
134 | unsigned long rx_ra; | |
135 | ||
136 | u32 rcv_nxt; | |
137 | u32 snd_nxt; | |
138 | ||
139 | unsigned long chan_state; | |
140 | ||
141 | struct ldc_channel_config cfg; | |
142 | void *event_arg; | |
143 | ||
144 | const struct ldc_mode_ops *mops; | |
145 | ||
146 | struct ldc_iommu iommu; | |
147 | ||
148 | struct ldc_version ver; | |
149 | ||
150 | u8 hs_state; | |
151 | #define LDC_HS_CLOSED 0x00 | |
152 | #define LDC_HS_OPEN 0x01 | |
153 | #define LDC_HS_GOTVERS 0x02 | |
154 | #define LDC_HS_SENTRTR 0x03 | |
155 | #define LDC_HS_GOTRTR 0x04 | |
156 | #define LDC_HS_COMPLETE 0x10 | |
157 | ||
158 | u8 flags; | |
159 | #define LDC_FLAG_ALLOCED_QUEUES 0x01 | |
160 | #define LDC_FLAG_REGISTERED_QUEUES 0x02 | |
161 | #define LDC_FLAG_REGISTERED_IRQS 0x04 | |
162 | #define LDC_FLAG_RESET 0x10 | |
163 | ||
164 | u8 mss; | |
165 | u8 state; | |
166 | ||
133f09a1 DM |
167 | #define LDC_IRQ_NAME_MAX 32 |
168 | char rx_irq_name[LDC_IRQ_NAME_MAX]; | |
169 | char tx_irq_name[LDC_IRQ_NAME_MAX]; | |
170 | ||
e53e97ce DM |
171 | struct hlist_head mh_list; |
172 | ||
173 | struct hlist_node list; | |
174 | }; | |
175 | ||
176 | #define ldcdbg(TYPE, f, a...) \ | |
177 | do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \ | |
178 | printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \ | |
179 | } while (0) | |
180 | ||
181 | static const char *state_to_str(u8 state) | |
182 | { | |
183 | switch (state) { | |
184 | case LDC_STATE_INVALID: | |
185 | return "INVALID"; | |
186 | case LDC_STATE_INIT: | |
187 | return "INIT"; | |
188 | case LDC_STATE_BOUND: | |
189 | return "BOUND"; | |
190 | case LDC_STATE_READY: | |
191 | return "READY"; | |
192 | case LDC_STATE_CONNECTED: | |
193 | return "CONNECTED"; | |
194 | default: | |
195 | return "<UNKNOWN>"; | |
196 | } | |
197 | } | |
198 | ||
199 | static void ldc_set_state(struct ldc_channel *lp, u8 state) | |
200 | { | |
201 | ldcdbg(STATE, "STATE (%s) --> (%s)\n", | |
202 | state_to_str(lp->state), | |
203 | state_to_str(state)); | |
204 | ||
205 | lp->state = state; | |
206 | } | |
207 | ||
208 | static unsigned long __advance(unsigned long off, unsigned long num_entries) | |
209 | { | |
210 | off += LDC_PACKET_SIZE; | |
211 | if (off == (num_entries * LDC_PACKET_SIZE)) | |
212 | off = 0; | |
213 | ||
214 | return off; | |
215 | } | |
216 | ||
217 | static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off) | |
218 | { | |
219 | return __advance(off, lp->rx_num_entries); | |
220 | } | |
221 | ||
222 | static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off) | |
223 | { | |
224 | return __advance(off, lp->tx_num_entries); | |
225 | } | |
226 | ||
227 | static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp, | |
228 | unsigned long *new_tail) | |
229 | { | |
230 | struct ldc_packet *p; | |
231 | unsigned long t; | |
232 | ||
233 | t = tx_advance(lp, lp->tx_tail); | |
234 | if (t == lp->tx_head) | |
235 | return NULL; | |
236 | ||
237 | *new_tail = t; | |
238 | ||
239 | p = lp->tx_base; | |
240 | return p + (lp->tx_tail / LDC_PACKET_SIZE); | |
241 | } | |
242 | ||
243 | /* When we are in reliable or stream mode, have to track the next packet | |
244 | * we haven't gotten an ACK for in the TX queue using tx_acked. We have | |
245 | * to be careful not to stomp over the queue past that point. During | |
246 | * the handshake, we don't have TX data packets pending in the queue | |
247 | * and that's why handshake_get_tx_packet() need not be mindful of | |
248 | * lp->tx_acked. | |
249 | */ | |
250 | static unsigned long head_for_data(struct ldc_channel *lp) | |
251 | { | |
cb481235 | 252 | if (lp->cfg.mode == LDC_MODE_STREAM) |
e53e97ce DM |
253 | return lp->tx_acked; |
254 | return lp->tx_head; | |
255 | } | |
256 | ||
257 | static int tx_has_space_for(struct ldc_channel *lp, unsigned int size) | |
258 | { | |
259 | unsigned long limit, tail, new_tail, diff; | |
260 | unsigned int mss; | |
261 | ||
262 | limit = head_for_data(lp); | |
263 | tail = lp->tx_tail; | |
264 | new_tail = tx_advance(lp, tail); | |
265 | if (new_tail == limit) | |
266 | return 0; | |
267 | ||
268 | if (limit > new_tail) | |
269 | diff = limit - new_tail; | |
270 | else | |
271 | diff = (limit + | |
272 | ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail)); | |
273 | diff /= LDC_PACKET_SIZE; | |
274 | mss = lp->mss; | |
275 | ||
276 | if (diff * mss < size) | |
277 | return 0; | |
278 | ||
279 | return 1; | |
280 | } | |
281 | ||
282 | static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp, | |
283 | unsigned long *new_tail) | |
284 | { | |
285 | struct ldc_packet *p; | |
286 | unsigned long h, t; | |
287 | ||
288 | h = head_for_data(lp); | |
289 | t = tx_advance(lp, lp->tx_tail); | |
290 | if (t == h) | |
291 | return NULL; | |
292 | ||
293 | *new_tail = t; | |
294 | ||
295 | p = lp->tx_base; | |
296 | return p + (lp->tx_tail / LDC_PACKET_SIZE); | |
297 | } | |
298 | ||
299 | static int set_tx_tail(struct ldc_channel *lp, unsigned long tail) | |
300 | { | |
301 | unsigned long orig_tail = lp->tx_tail; | |
302 | int limit = 1000; | |
303 | ||
304 | lp->tx_tail = tail; | |
305 | while (limit-- > 0) { | |
306 | unsigned long err; | |
307 | ||
308 | err = sun4v_ldc_tx_set_qtail(lp->id, tail); | |
309 | if (!err) | |
310 | return 0; | |
311 | ||
312 | if (err != HV_EWOULDBLOCK) { | |
313 | lp->tx_tail = orig_tail; | |
314 | return -EINVAL; | |
315 | } | |
316 | udelay(1); | |
317 | } | |
318 | ||
319 | lp->tx_tail = orig_tail; | |
320 | return -EBUSY; | |
321 | } | |
322 | ||
323 | /* This just updates the head value in the hypervisor using | |
324 | * a polling loop with a timeout. The caller takes care of | |
325 | * upating software state representing the head change, if any. | |
326 | */ | |
327 | static int __set_rx_head(struct ldc_channel *lp, unsigned long head) | |
328 | { | |
329 | int limit = 1000; | |
330 | ||
331 | while (limit-- > 0) { | |
332 | unsigned long err; | |
333 | ||
334 | err = sun4v_ldc_rx_set_qhead(lp->id, head); | |
335 | if (!err) | |
336 | return 0; | |
337 | ||
338 | if (err != HV_EWOULDBLOCK) | |
339 | return -EINVAL; | |
340 | ||
341 | udelay(1); | |
342 | } | |
343 | ||
344 | return -EBUSY; | |
345 | } | |
346 | ||
347 | static int send_tx_packet(struct ldc_channel *lp, | |
348 | struct ldc_packet *p, | |
349 | unsigned long new_tail) | |
350 | { | |
351 | BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE))); | |
352 | ||
353 | return set_tx_tail(lp, new_tail); | |
354 | } | |
355 | ||
356 | static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp, | |
357 | u8 stype, u8 ctrl, | |
358 | void *data, int dlen, | |
359 | unsigned long *new_tail) | |
360 | { | |
361 | struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail); | |
362 | ||
363 | if (p) { | |
364 | memset(p, 0, sizeof(*p)); | |
365 | p->type = LDC_CTRL; | |
366 | p->stype = stype; | |
367 | p->ctrl = ctrl; | |
368 | if (data) | |
369 | memcpy(p->u.u_data, data, dlen); | |
370 | } | |
371 | return p; | |
372 | } | |
373 | ||
374 | static int start_handshake(struct ldc_channel *lp) | |
375 | { | |
376 | struct ldc_packet *p; | |
377 | struct ldc_version *ver; | |
378 | unsigned long new_tail; | |
379 | ||
380 | ver = &ver_arr[0]; | |
381 | ||
382 | ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n", | |
383 | ver->major, ver->minor); | |
384 | ||
385 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, | |
386 | ver, sizeof(*ver), &new_tail); | |
387 | if (p) { | |
388 | int err = send_tx_packet(lp, p, new_tail); | |
389 | if (!err) | |
390 | lp->flags &= ~LDC_FLAG_RESET; | |
391 | return err; | |
392 | } | |
393 | return -EBUSY; | |
394 | } | |
395 | ||
396 | static int send_version_nack(struct ldc_channel *lp, | |
397 | u16 major, u16 minor) | |
398 | { | |
399 | struct ldc_packet *p; | |
400 | struct ldc_version ver; | |
401 | unsigned long new_tail; | |
402 | ||
403 | ver.major = major; | |
404 | ver.minor = minor; | |
405 | ||
406 | p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS, | |
407 | &ver, sizeof(ver), &new_tail); | |
408 | if (p) { | |
409 | ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n", | |
410 | ver.major, ver.minor); | |
411 | ||
412 | return send_tx_packet(lp, p, new_tail); | |
413 | } | |
414 | return -EBUSY; | |
415 | } | |
416 | ||
417 | static int send_version_ack(struct ldc_channel *lp, | |
418 | struct ldc_version *vp) | |
419 | { | |
420 | struct ldc_packet *p; | |
421 | unsigned long new_tail; | |
422 | ||
423 | p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS, | |
424 | vp, sizeof(*vp), &new_tail); | |
425 | if (p) { | |
426 | ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n", | |
427 | vp->major, vp->minor); | |
428 | ||
429 | return send_tx_packet(lp, p, new_tail); | |
430 | } | |
431 | return -EBUSY; | |
432 | } | |
433 | ||
434 | static int send_rts(struct ldc_channel *lp) | |
435 | { | |
436 | struct ldc_packet *p; | |
437 | unsigned long new_tail; | |
438 | ||
439 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0, | |
440 | &new_tail); | |
441 | if (p) { | |
442 | p->env = lp->cfg.mode; | |
443 | p->seqid = 0; | |
444 | lp->rcv_nxt = 0; | |
445 | ||
446 | ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n", | |
447 | p->env, p->seqid); | |
448 | ||
449 | return send_tx_packet(lp, p, new_tail); | |
450 | } | |
451 | return -EBUSY; | |
452 | } | |
453 | ||
454 | static int send_rtr(struct ldc_channel *lp) | |
455 | { | |
456 | struct ldc_packet *p; | |
457 | unsigned long new_tail; | |
458 | ||
459 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0, | |
460 | &new_tail); | |
461 | if (p) { | |
462 | p->env = lp->cfg.mode; | |
463 | p->seqid = 0; | |
464 | ||
465 | ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n", | |
466 | p->env, p->seqid); | |
467 | ||
468 | return send_tx_packet(lp, p, new_tail); | |
469 | } | |
470 | return -EBUSY; | |
471 | } | |
472 | ||
473 | static int send_rdx(struct ldc_channel *lp) | |
474 | { | |
475 | struct ldc_packet *p; | |
476 | unsigned long new_tail; | |
477 | ||
478 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0, | |
479 | &new_tail); | |
480 | if (p) { | |
481 | p->env = 0; | |
482 | p->seqid = ++lp->snd_nxt; | |
483 | p->u.r.ackid = lp->rcv_nxt; | |
484 | ||
485 | ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n", | |
486 | p->env, p->seqid, p->u.r.ackid); | |
487 | ||
488 | return send_tx_packet(lp, p, new_tail); | |
489 | } | |
490 | return -EBUSY; | |
491 | } | |
492 | ||
493 | static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt) | |
494 | { | |
495 | struct ldc_packet *p; | |
496 | unsigned long new_tail; | |
497 | int err; | |
498 | ||
499 | p = data_get_tx_packet(lp, &new_tail); | |
500 | if (!p) | |
501 | return -EBUSY; | |
502 | memset(p, 0, sizeof(*p)); | |
503 | p->type = data_pkt->type; | |
504 | p->stype = LDC_NACK; | |
505 | p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK; | |
cb481235 | 506 | p->seqid = lp->snd_nxt + 1; |
e53e97ce DM |
507 | p->u.r.ackid = lp->rcv_nxt; |
508 | ||
509 | ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n", | |
510 | p->type, p->ctrl, p->seqid, p->u.r.ackid); | |
511 | ||
512 | err = send_tx_packet(lp, p, new_tail); | |
513 | if (!err) | |
514 | lp->snd_nxt++; | |
515 | ||
516 | return err; | |
517 | } | |
518 | ||
519 | static int ldc_abort(struct ldc_channel *lp) | |
520 | { | |
521 | unsigned long hv_err; | |
522 | ||
523 | ldcdbg(STATE, "ABORT\n"); | |
524 | ||
525 | /* We report but do not act upon the hypervisor errors because | |
526 | * there really isn't much we can do if they fail at this point. | |
527 | */ | |
528 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
529 | if (hv_err) | |
530 | printk(KERN_ERR PFX "ldc_abort: " | |
531 | "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n", | |
532 | lp->id, lp->tx_ra, lp->tx_num_entries, hv_err); | |
533 | ||
534 | hv_err = sun4v_ldc_tx_get_state(lp->id, | |
535 | &lp->tx_head, | |
536 | &lp->tx_tail, | |
537 | &lp->chan_state); | |
538 | if (hv_err) | |
539 | printk(KERN_ERR PFX "ldc_abort: " | |
540 | "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n", | |
541 | lp->id, hv_err); | |
542 | ||
543 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); | |
544 | if (hv_err) | |
545 | printk(KERN_ERR PFX "ldc_abort: " | |
546 | "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n", | |
547 | lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); | |
548 | ||
549 | /* Refetch the RX queue state as well, because we could be invoked | |
550 | * here in the queue processing context. | |
551 | */ | |
552 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
553 | &lp->rx_head, | |
554 | &lp->rx_tail, | |
555 | &lp->chan_state); | |
556 | if (hv_err) | |
557 | printk(KERN_ERR PFX "ldc_abort: " | |
558 | "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n", | |
559 | lp->id, hv_err); | |
560 | ||
561 | return -ECONNRESET; | |
562 | } | |
563 | ||
564 | static struct ldc_version *find_by_major(u16 major) | |
565 | { | |
566 | struct ldc_version *ret = NULL; | |
567 | int i; | |
568 | ||
569 | for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { | |
570 | struct ldc_version *v = &ver_arr[i]; | |
571 | if (v->major <= major) { | |
572 | ret = v; | |
573 | break; | |
574 | } | |
575 | } | |
576 | return ret; | |
577 | } | |
578 | ||
579 | static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) | |
580 | { | |
581 | struct ldc_version *vap; | |
582 | int err; | |
583 | ||
584 | ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n", | |
585 | vp->major, vp->minor); | |
586 | ||
587 | if (lp->hs_state == LDC_HS_GOTVERS) { | |
588 | lp->hs_state = LDC_HS_OPEN; | |
589 | memset(&lp->ver, 0, sizeof(lp->ver)); | |
590 | } | |
591 | ||
592 | vap = find_by_major(vp->major); | |
593 | if (!vap) { | |
594 | err = send_version_nack(lp, 0, 0); | |
595 | } else if (vap->major != vp->major) { | |
596 | err = send_version_nack(lp, vap->major, vap->minor); | |
597 | } else { | |
598 | struct ldc_version ver = *vp; | |
599 | if (ver.minor > vap->minor) | |
600 | ver.minor = vap->minor; | |
601 | err = send_version_ack(lp, &ver); | |
602 | if (!err) { | |
603 | lp->ver = ver; | |
604 | lp->hs_state = LDC_HS_GOTVERS; | |
605 | } | |
606 | } | |
607 | if (err) | |
608 | return ldc_abort(lp); | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp) | |
614 | { | |
615 | ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n", | |
616 | vp->major, vp->minor); | |
617 | ||
618 | if (lp->hs_state == LDC_HS_GOTVERS) { | |
619 | if (lp->ver.major != vp->major || | |
620 | lp->ver.minor != vp->minor) | |
621 | return ldc_abort(lp); | |
622 | } else { | |
623 | lp->ver = *vp; | |
624 | lp->hs_state = LDC_HS_GOTVERS; | |
625 | } | |
626 | if (send_rts(lp)) | |
627 | return ldc_abort(lp); | |
628 | return 0; | |
629 | } | |
630 | ||
631 | static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp) | |
632 | { | |
633 | struct ldc_version *vap; | |
b2c0805f SR |
634 | struct ldc_packet *p; |
635 | unsigned long new_tail; | |
e53e97ce | 636 | |
b2c0805f SR |
637 | if (vp->major == 0 && vp->minor == 0) |
638 | return ldc_abort(lp); | |
639 | ||
640 | vap = find_by_major(vp->major); | |
641 | if (!vap) | |
e53e97ce | 642 | return ldc_abort(lp); |
e53e97ce | 643 | |
b2c0805f | 644 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
e53e97ce DM |
645 | vap, sizeof(*vap), |
646 | &new_tail); | |
b2c0805f SR |
647 | if (!p) |
648 | return ldc_abort(lp); | |
649 | ||
650 | return send_tx_packet(lp, p, new_tail); | |
e53e97ce DM |
651 | } |
652 | ||
653 | static int process_version(struct ldc_channel *lp, | |
654 | struct ldc_packet *p) | |
655 | { | |
656 | struct ldc_version *vp; | |
657 | ||
658 | vp = (struct ldc_version *) p->u.u_data; | |
659 | ||
660 | switch (p->stype) { | |
661 | case LDC_INFO: | |
662 | return process_ver_info(lp, vp); | |
663 | ||
664 | case LDC_ACK: | |
665 | return process_ver_ack(lp, vp); | |
666 | ||
667 | case LDC_NACK: | |
668 | return process_ver_nack(lp, vp); | |
669 | ||
670 | default: | |
671 | return ldc_abort(lp); | |
672 | } | |
673 | } | |
674 | ||
675 | static int process_rts(struct ldc_channel *lp, | |
676 | struct ldc_packet *p) | |
677 | { | |
678 | ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n", | |
679 | p->stype, p->seqid, p->env); | |
680 | ||
681 | if (p->stype != LDC_INFO || | |
682 | lp->hs_state != LDC_HS_GOTVERS || | |
683 | p->env != lp->cfg.mode) | |
684 | return ldc_abort(lp); | |
685 | ||
686 | lp->snd_nxt = p->seqid; | |
687 | lp->rcv_nxt = p->seqid; | |
688 | lp->hs_state = LDC_HS_SENTRTR; | |
689 | if (send_rtr(lp)) | |
690 | return ldc_abort(lp); | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static int process_rtr(struct ldc_channel *lp, | |
696 | struct ldc_packet *p) | |
697 | { | |
698 | ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n", | |
699 | p->stype, p->seqid, p->env); | |
700 | ||
701 | if (p->stype != LDC_INFO || | |
702 | p->env != lp->cfg.mode) | |
703 | return ldc_abort(lp); | |
704 | ||
705 | lp->snd_nxt = p->seqid; | |
706 | lp->hs_state = LDC_HS_COMPLETE; | |
707 | ldc_set_state(lp, LDC_STATE_CONNECTED); | |
708 | send_rdx(lp); | |
709 | ||
710 | return LDC_EVENT_UP; | |
711 | } | |
712 | ||
713 | static int rx_seq_ok(struct ldc_channel *lp, u32 seqid) | |
714 | { | |
715 | return lp->rcv_nxt + 1 == seqid; | |
716 | } | |
717 | ||
718 | static int process_rdx(struct ldc_channel *lp, | |
719 | struct ldc_packet *p) | |
720 | { | |
721 | ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n", | |
722 | p->stype, p->seqid, p->env, p->u.r.ackid); | |
723 | ||
724 | if (p->stype != LDC_INFO || | |
725 | !(rx_seq_ok(lp, p->seqid))) | |
726 | return ldc_abort(lp); | |
727 | ||
728 | lp->rcv_nxt = p->seqid; | |
729 | ||
730 | lp->hs_state = LDC_HS_COMPLETE; | |
731 | ldc_set_state(lp, LDC_STATE_CONNECTED); | |
732 | ||
733 | return LDC_EVENT_UP; | |
734 | } | |
735 | ||
736 | static int process_control_frame(struct ldc_channel *lp, | |
737 | struct ldc_packet *p) | |
738 | { | |
739 | switch (p->ctrl) { | |
740 | case LDC_VERS: | |
741 | return process_version(lp, p); | |
742 | ||
743 | case LDC_RTS: | |
744 | return process_rts(lp, p); | |
745 | ||
746 | case LDC_RTR: | |
747 | return process_rtr(lp, p); | |
748 | ||
749 | case LDC_RDX: | |
750 | return process_rdx(lp, p); | |
751 | ||
752 | default: | |
753 | return ldc_abort(lp); | |
754 | } | |
755 | } | |
756 | ||
757 | static int process_error_frame(struct ldc_channel *lp, | |
758 | struct ldc_packet *p) | |
759 | { | |
760 | return ldc_abort(lp); | |
761 | } | |
762 | ||
763 | static int process_data_ack(struct ldc_channel *lp, | |
764 | struct ldc_packet *ack) | |
765 | { | |
766 | unsigned long head = lp->tx_acked; | |
767 | u32 ackid = ack->u.r.ackid; | |
768 | ||
769 | while (1) { | |
770 | struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE); | |
771 | ||
772 | head = tx_advance(lp, head); | |
773 | ||
774 | if (p->seqid == ackid) { | |
775 | lp->tx_acked = head; | |
776 | return 0; | |
777 | } | |
cb481235 | 778 | if (head == lp->tx_tail) |
e53e97ce DM |
779 | return ldc_abort(lp); |
780 | } | |
781 | ||
782 | return 0; | |
783 | } | |
784 | ||
785 | static void send_events(struct ldc_channel *lp, unsigned int event_mask) | |
786 | { | |
787 | if (event_mask & LDC_EVENT_RESET) | |
788 | lp->cfg.event(lp->event_arg, LDC_EVENT_RESET); | |
789 | if (event_mask & LDC_EVENT_UP) | |
790 | lp->cfg.event(lp->event_arg, LDC_EVENT_UP); | |
791 | if (event_mask & LDC_EVENT_DATA_READY) | |
792 | lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY); | |
793 | } | |
794 | ||
795 | static irqreturn_t ldc_rx(int irq, void *dev_id) | |
796 | { | |
797 | struct ldc_channel *lp = dev_id; | |
c6fee081 | 798 | unsigned long orig_state, flags; |
e53e97ce DM |
799 | unsigned int event_mask; |
800 | ||
801 | spin_lock_irqsave(&lp->lock, flags); | |
802 | ||
803 | orig_state = lp->chan_state; | |
c6fee081 DM |
804 | |
805 | /* We should probably check for hypervisor errors here and | |
806 | * reset the LDC channel if we get one. | |
807 | */ | |
808 | sun4v_ldc_rx_get_state(lp->id, | |
809 | &lp->rx_head, | |
810 | &lp->rx_tail, | |
811 | &lp->chan_state); | |
e53e97ce DM |
812 | |
813 | ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", | |
814 | orig_state, lp->chan_state, lp->rx_head, lp->rx_tail); | |
815 | ||
816 | event_mask = 0; | |
817 | ||
818 | if (lp->cfg.mode == LDC_MODE_RAW && | |
819 | lp->chan_state == LDC_CHANNEL_UP) { | |
820 | lp->hs_state = LDC_HS_COMPLETE; | |
821 | ldc_set_state(lp, LDC_STATE_CONNECTED); | |
822 | ||
823 | event_mask |= LDC_EVENT_UP; | |
824 | ||
825 | orig_state = lp->chan_state; | |
826 | } | |
827 | ||
828 | /* If we are in reset state, flush the RX queue and ignore | |
829 | * everything. | |
830 | */ | |
831 | if (lp->flags & LDC_FLAG_RESET) { | |
832 | (void) __set_rx_head(lp, lp->rx_tail); | |
833 | goto out; | |
834 | } | |
835 | ||
836 | /* Once we finish the handshake, we let the ldc_read() | |
837 | * paths do all of the control frame and state management. | |
838 | * Just trigger the callback. | |
839 | */ | |
840 | if (lp->hs_state == LDC_HS_COMPLETE) { | |
841 | handshake_complete: | |
842 | if (lp->chan_state != orig_state) { | |
843 | unsigned int event = LDC_EVENT_RESET; | |
844 | ||
845 | if (lp->chan_state == LDC_CHANNEL_UP) | |
846 | event = LDC_EVENT_UP; | |
847 | ||
848 | event_mask |= event; | |
849 | } | |
850 | if (lp->rx_head != lp->rx_tail) | |
851 | event_mask |= LDC_EVENT_DATA_READY; | |
852 | ||
853 | goto out; | |
854 | } | |
855 | ||
856 | if (lp->chan_state != orig_state) | |
857 | goto out; | |
858 | ||
859 | while (lp->rx_head != lp->rx_tail) { | |
860 | struct ldc_packet *p; | |
861 | unsigned long new; | |
862 | int err; | |
863 | ||
864 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); | |
865 | ||
866 | switch (p->type) { | |
867 | case LDC_CTRL: | |
868 | err = process_control_frame(lp, p); | |
869 | if (err > 0) | |
870 | event_mask |= err; | |
871 | break; | |
872 | ||
873 | case LDC_DATA: | |
874 | event_mask |= LDC_EVENT_DATA_READY; | |
875 | err = 0; | |
876 | break; | |
877 | ||
878 | case LDC_ERR: | |
879 | err = process_error_frame(lp, p); | |
880 | break; | |
881 | ||
882 | default: | |
883 | err = ldc_abort(lp); | |
884 | break; | |
885 | } | |
886 | ||
887 | if (err < 0) | |
888 | break; | |
889 | ||
890 | new = lp->rx_head; | |
891 | new += LDC_PACKET_SIZE; | |
892 | if (new == (lp->rx_num_entries * LDC_PACKET_SIZE)) | |
893 | new = 0; | |
894 | lp->rx_head = new; | |
895 | ||
896 | err = __set_rx_head(lp, new); | |
897 | if (err < 0) { | |
898 | (void) ldc_abort(lp); | |
899 | break; | |
900 | } | |
901 | if (lp->hs_state == LDC_HS_COMPLETE) | |
902 | goto handshake_complete; | |
903 | } | |
904 | ||
905 | out: | |
906 | spin_unlock_irqrestore(&lp->lock, flags); | |
907 | ||
908 | send_events(lp, event_mask); | |
909 | ||
910 | return IRQ_HANDLED; | |
911 | } | |
912 | ||
913 | static irqreturn_t ldc_tx(int irq, void *dev_id) | |
914 | { | |
915 | struct ldc_channel *lp = dev_id; | |
c6fee081 | 916 | unsigned long flags, orig_state; |
e53e97ce DM |
917 | unsigned int event_mask = 0; |
918 | ||
919 | spin_lock_irqsave(&lp->lock, flags); | |
920 | ||
921 | orig_state = lp->chan_state; | |
c6fee081 DM |
922 | |
923 | /* We should probably check for hypervisor errors here and | |
924 | * reset the LDC channel if we get one. | |
925 | */ | |
926 | sun4v_ldc_tx_get_state(lp->id, | |
927 | &lp->tx_head, | |
928 | &lp->tx_tail, | |
929 | &lp->chan_state); | |
e53e97ce DM |
930 | |
931 | ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n", | |
932 | orig_state, lp->chan_state, lp->tx_head, lp->tx_tail); | |
933 | ||
934 | if (lp->cfg.mode == LDC_MODE_RAW && | |
935 | lp->chan_state == LDC_CHANNEL_UP) { | |
936 | lp->hs_state = LDC_HS_COMPLETE; | |
937 | ldc_set_state(lp, LDC_STATE_CONNECTED); | |
938 | ||
939 | event_mask |= LDC_EVENT_UP; | |
940 | } | |
941 | ||
942 | spin_unlock_irqrestore(&lp->lock, flags); | |
943 | ||
944 | send_events(lp, event_mask); | |
945 | ||
946 | return IRQ_HANDLED; | |
947 | } | |
948 | ||
949 | /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so | |
950 | * XXX that addition and removal from the ldc_channel_list has | |
951 | * XXX atomicity, otherwise the __ldc_channel_exists() check is | |
952 | * XXX totally pointless as another thread can slip into ldc_alloc() | |
953 | * XXX and add a channel with the same ID. There also needs to be | |
954 | * XXX a spinlock for ldc_channel_list. | |
955 | */ | |
956 | static HLIST_HEAD(ldc_channel_list); | |
957 | ||
958 | static int __ldc_channel_exists(unsigned long id) | |
959 | { | |
960 | struct ldc_channel *lp; | |
e53e97ce | 961 | |
b67bfe0d | 962 | hlist_for_each_entry(lp, &ldc_channel_list, list) { |
e53e97ce DM |
963 | if (lp->id == id) |
964 | return 1; | |
965 | } | |
966 | return 0; | |
967 | } | |
968 | ||
969 | static int alloc_queue(const char *name, unsigned long num_entries, | |
970 | struct ldc_packet **base, unsigned long *ra) | |
971 | { | |
972 | unsigned long size, order; | |
973 | void *q; | |
974 | ||
975 | size = num_entries * LDC_PACKET_SIZE; | |
976 | order = get_order(size); | |
977 | ||
978 | q = (void *) __get_free_pages(GFP_KERNEL, order); | |
979 | if (!q) { | |
980 | printk(KERN_ERR PFX "Alloc of %s queue failed with " | |
981 | "size=%lu order=%lu\n", name, size, order); | |
982 | return -ENOMEM; | |
983 | } | |
984 | ||
985 | memset(q, 0, PAGE_SIZE << order); | |
986 | ||
987 | *base = q; | |
988 | *ra = __pa(q); | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | static void free_queue(unsigned long num_entries, struct ldc_packet *q) | |
994 | { | |
995 | unsigned long size, order; | |
996 | ||
997 | if (!q) | |
998 | return; | |
999 | ||
1000 | size = num_entries * LDC_PACKET_SIZE; | |
1001 | order = get_order(size); | |
1002 | ||
1003 | free_pages((unsigned long)q, order); | |
1004 | } | |
1005 | ||
0ae53ed1 SV |
1006 | static unsigned long ldc_cookie_to_index(u64 cookie, void *arg) |
1007 | { | |
1008 | u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; | |
1009 | /* struct ldc_iommu *ldc_iommu = (struct ldc_iommu *)arg; */ | |
1010 | ||
1011 | cookie &= ~COOKIE_PGSZ_CODE; | |
1012 | ||
1013 | return (cookie >> (13ULL + (szcode * 3ULL))); | |
1014 | } | |
1015 | ||
1016 | static void ldc_demap(struct ldc_iommu *iommu, unsigned long id, u64 cookie, | |
1017 | unsigned long entry, unsigned long npages) | |
1018 | { | |
1019 | struct ldc_mtable_entry *base; | |
1020 | unsigned long i, shift; | |
1021 | ||
1022 | shift = (cookie >> COOKIE_PGSZ_CODE_SHIFT) * 3; | |
1023 | base = iommu->page_table + entry; | |
1024 | for (i = 0; i < npages; i++) { | |
1025 | if (base->cookie) | |
1026 | sun4v_ldc_revoke(id, cookie + (i << shift), | |
1027 | base->cookie); | |
1028 | base->mte = 0; | |
1029 | } | |
1030 | } | |
1031 | ||
e53e97ce DM |
1032 | /* XXX Make this configurable... XXX */ |
1033 | #define LDC_IOTABLE_SIZE (8 * 1024) | |
1034 | ||
0ae53ed1 | 1035 | static int ldc_iommu_init(const char *name, struct ldc_channel *lp) |
e53e97ce DM |
1036 | { |
1037 | unsigned long sz, num_tsb_entries, tsbsize, order; | |
0ae53ed1 SV |
1038 | struct ldc_iommu *ldc_iommu = &lp->iommu; |
1039 | struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; | |
e53e97ce DM |
1040 | struct ldc_mtable_entry *table; |
1041 | unsigned long hv_err; | |
1042 | int err; | |
1043 | ||
1044 | num_tsb_entries = LDC_IOTABLE_SIZE; | |
1045 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); | |
0ae53ed1 | 1046 | spin_lock_init(&ldc_iommu->lock); |
e53e97ce DM |
1047 | |
1048 | sz = num_tsb_entries / 8; | |
1049 | sz = (sz + 7UL) & ~7UL; | |
0ae53ed1 SV |
1050 | iommu->map = kzalloc(sz, GFP_KERNEL); |
1051 | if (!iommu->map) { | |
e53e97ce DM |
1052 | printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); |
1053 | return -ENOMEM; | |
1054 | } | |
0ae53ed1 SV |
1055 | iommu_tbl_pool_init(iommu, num_tsb_entries, PAGE_SHIFT, |
1056 | NULL, false /* no large pool */, | |
1057 | 1 /* npools */, | |
1058 | true /* skip span boundary check */); | |
e53e97ce DM |
1059 | |
1060 | order = get_order(tsbsize); | |
1061 | ||
1062 | table = (struct ldc_mtable_entry *) | |
1063 | __get_free_pages(GFP_KERNEL, order); | |
1064 | err = -ENOMEM; | |
1065 | if (!table) { | |
1066 | printk(KERN_ERR PFX "Alloc of MTE table failed, " | |
1067 | "size=%lu order=%lu\n", tsbsize, order); | |
1068 | goto out_free_map; | |
1069 | } | |
1070 | ||
1071 | memset(table, 0, PAGE_SIZE << order); | |
1072 | ||
0ae53ed1 | 1073 | ldc_iommu->page_table = table; |
e53e97ce DM |
1074 | |
1075 | hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), | |
1076 | num_tsb_entries); | |
1077 | err = -EINVAL; | |
1078 | if (hv_err) | |
1079 | goto out_free_table; | |
1080 | ||
1081 | return 0; | |
1082 | ||
1083 | out_free_table: | |
1084 | free_pages((unsigned long) table, order); | |
0ae53ed1 | 1085 | ldc_iommu->page_table = NULL; |
e53e97ce DM |
1086 | |
1087 | out_free_map: | |
0ae53ed1 SV |
1088 | kfree(iommu->map); |
1089 | iommu->map = NULL; | |
e53e97ce DM |
1090 | |
1091 | return err; | |
1092 | } | |
1093 | ||
1094 | static void ldc_iommu_release(struct ldc_channel *lp) | |
1095 | { | |
0ae53ed1 SV |
1096 | struct ldc_iommu *ldc_iommu = &lp->iommu; |
1097 | struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; | |
e53e97ce DM |
1098 | unsigned long num_tsb_entries, tsbsize, order; |
1099 | ||
1100 | (void) sun4v_ldc_set_map_table(lp->id, 0, 0); | |
1101 | ||
0ae53ed1 | 1102 | num_tsb_entries = iommu->poolsize * iommu->nr_pools; |
e53e97ce DM |
1103 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
1104 | order = get_order(tsbsize); | |
1105 | ||
0ae53ed1 SV |
1106 | free_pages((unsigned long) ldc_iommu->page_table, order); |
1107 | ldc_iommu->page_table = NULL; | |
e53e97ce | 1108 | |
0ae53ed1 SV |
1109 | kfree(iommu->map); |
1110 | iommu->map = NULL; | |
e53e97ce DM |
1111 | } |
1112 | ||
1113 | struct ldc_channel *ldc_alloc(unsigned long id, | |
1114 | const struct ldc_channel_config *cfgp, | |
c21c4ab0 SV |
1115 | void *event_arg, |
1116 | const char *name) | |
e53e97ce DM |
1117 | { |
1118 | struct ldc_channel *lp; | |
1119 | const struct ldc_mode_ops *mops; | |
1120 | unsigned long dummy1, dummy2, hv_err; | |
1121 | u8 mss, *mssbuf; | |
1122 | int err; | |
1123 | ||
1124 | err = -ENODEV; | |
1125 | if (!ldom_domaining_enabled) | |
1126 | goto out_err; | |
1127 | ||
1128 | err = -EINVAL; | |
1129 | if (!cfgp) | |
1130 | goto out_err; | |
c21c4ab0 SV |
1131 | if (!name) |
1132 | goto out_err; | |
e53e97ce DM |
1133 | |
1134 | switch (cfgp->mode) { | |
1135 | case LDC_MODE_RAW: | |
1136 | mops = &raw_ops; | |
1137 | mss = LDC_PACKET_SIZE; | |
1138 | break; | |
1139 | ||
1140 | case LDC_MODE_UNRELIABLE: | |
1141 | mops = &nonraw_ops; | |
1142 | mss = LDC_PACKET_SIZE - 8; | |
1143 | break; | |
1144 | ||
e53e97ce DM |
1145 | case LDC_MODE_STREAM: |
1146 | mops = &stream_ops; | |
1147 | mss = LDC_PACKET_SIZE - 8 - 8; | |
1148 | break; | |
1149 | ||
1150 | default: | |
1151 | goto out_err; | |
1152 | } | |
1153 | ||
1154 | if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) | |
1155 | goto out_err; | |
1156 | ||
1157 | hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); | |
1158 | err = -ENODEV; | |
1159 | if (hv_err == HV_ECHANNEL) | |
1160 | goto out_err; | |
1161 | ||
1162 | err = -EEXIST; | |
1163 | if (__ldc_channel_exists(id)) | |
1164 | goto out_err; | |
1165 | ||
1166 | mssbuf = NULL; | |
1167 | ||
1168 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); | |
1169 | err = -ENOMEM; | |
1170 | if (!lp) | |
1171 | goto out_err; | |
1172 | ||
1173 | spin_lock_init(&lp->lock); | |
1174 | ||
1175 | lp->id = id; | |
1176 | ||
0ae53ed1 | 1177 | err = ldc_iommu_init(name, lp); |
e53e97ce DM |
1178 | if (err) |
1179 | goto out_free_ldc; | |
1180 | ||
1181 | lp->mops = mops; | |
1182 | lp->mss = mss; | |
1183 | ||
1184 | lp->cfg = *cfgp; | |
1185 | if (!lp->cfg.mtu) | |
1186 | lp->cfg.mtu = LDC_DEFAULT_MTU; | |
1187 | ||
1188 | if (lp->cfg.mode == LDC_MODE_STREAM) { | |
1189 | mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL); | |
1190 | if (!mssbuf) { | |
1191 | err = -ENOMEM; | |
1192 | goto out_free_iommu; | |
1193 | } | |
1194 | lp->mssbuf = mssbuf; | |
1195 | } | |
1196 | ||
1197 | lp->event_arg = event_arg; | |
1198 | ||
1199 | /* XXX allow setting via ldc_channel_config to override defaults | |
1200 | * XXX or use some formula based upon mtu | |
1201 | */ | |
1202 | lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; | |
1203 | lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; | |
1204 | ||
1205 | err = alloc_queue("TX", lp->tx_num_entries, | |
1206 | &lp->tx_base, &lp->tx_ra); | |
1207 | if (err) | |
1208 | goto out_free_mssbuf; | |
1209 | ||
1210 | err = alloc_queue("RX", lp->rx_num_entries, | |
1211 | &lp->rx_base, &lp->rx_ra); | |
1212 | if (err) | |
1213 | goto out_free_txq; | |
1214 | ||
1215 | lp->flags |= LDC_FLAG_ALLOCED_QUEUES; | |
1216 | ||
1217 | lp->hs_state = LDC_HS_CLOSED; | |
1218 | ldc_set_state(lp, LDC_STATE_INIT); | |
1219 | ||
1220 | INIT_HLIST_NODE(&lp->list); | |
1221 | hlist_add_head(&lp->list, &ldc_channel_list); | |
1222 | ||
1223 | INIT_HLIST_HEAD(&lp->mh_list); | |
1224 | ||
c21c4ab0 SV |
1225 | snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); |
1226 | snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); | |
1227 | ||
1228 | err = request_irq(lp->cfg.rx_irq, ldc_rx, 0, | |
1229 | lp->rx_irq_name, lp); | |
1230 | if (err) | |
1231 | goto out_free_txq; | |
1232 | ||
1233 | err = request_irq(lp->cfg.tx_irq, ldc_tx, 0, | |
1234 | lp->tx_irq_name, lp); | |
1235 | if (err) { | |
1236 | free_irq(lp->cfg.rx_irq, lp); | |
1237 | goto out_free_txq; | |
1238 | } | |
1239 | ||
e53e97ce DM |
1240 | return lp; |
1241 | ||
1242 | out_free_txq: | |
1243 | free_queue(lp->tx_num_entries, lp->tx_base); | |
1244 | ||
1245 | out_free_mssbuf: | |
ed247e12 | 1246 | kfree(mssbuf); |
e53e97ce DM |
1247 | |
1248 | out_free_iommu: | |
1249 | ldc_iommu_release(lp); | |
1250 | ||
1251 | out_free_ldc: | |
1252 | kfree(lp); | |
1253 | ||
1254 | out_err: | |
1255 | return ERR_PTR(err); | |
1256 | } | |
1257 | EXPORT_SYMBOL(ldc_alloc); | |
1258 | ||
1678c2bd | 1259 | void ldc_unbind(struct ldc_channel *lp) |
e53e97ce DM |
1260 | { |
1261 | if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { | |
1262 | free_irq(lp->cfg.rx_irq, lp); | |
1263 | free_irq(lp->cfg.tx_irq, lp); | |
1678c2bd | 1264 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
e53e97ce DM |
1265 | } |
1266 | ||
1267 | if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { | |
1268 | sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1269 | sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1270 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; | |
1271 | } | |
1272 | if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { | |
1273 | free_queue(lp->tx_num_entries, lp->tx_base); | |
1274 | free_queue(lp->rx_num_entries, lp->rx_base); | |
1275 | lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; | |
1276 | } | |
1277 | ||
1678c2bd DE |
1278 | ldc_set_state(lp, LDC_STATE_INIT); |
1279 | } | |
1280 | EXPORT_SYMBOL(ldc_unbind); | |
e53e97ce | 1281 | |
1678c2bd DE |
1282 | void ldc_free(struct ldc_channel *lp) |
1283 | { | |
1284 | ldc_unbind(lp); | |
1285 | hlist_del(&lp->list); | |
ed247e12 | 1286 | kfree(lp->mssbuf); |
e53e97ce DM |
1287 | ldc_iommu_release(lp); |
1288 | ||
1289 | kfree(lp); | |
1290 | } | |
1291 | EXPORT_SYMBOL(ldc_free); | |
1292 | ||
1293 | /* Bind the channel. This registers the LDC queues with | |
1294 | * the hypervisor and puts the channel into a pseudo-listening | |
1295 | * state. This does not initiate a handshake, ldc_connect() does | |
1296 | * that. | |
1297 | */ | |
c21c4ab0 | 1298 | int ldc_bind(struct ldc_channel *lp) |
e53e97ce DM |
1299 | { |
1300 | unsigned long hv_err, flags; | |
1301 | int err = -EINVAL; | |
1302 | ||
c21c4ab0 | 1303 | if (lp->state != LDC_STATE_INIT) |
b7c2a757 | 1304 | return -EINVAL; |
e53e97ce | 1305 | |
b7c2a757 DM |
1306 | spin_lock_irqsave(&lp->lock, flags); |
1307 | ||
1308 | enable_irq(lp->cfg.rx_irq); | |
1309 | enable_irq(lp->cfg.tx_irq); | |
e53e97ce DM |
1310 | |
1311 | lp->flags |= LDC_FLAG_REGISTERED_IRQS; | |
1312 | ||
1313 | err = -ENODEV; | |
1314 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1315 | if (hv_err) | |
b7c2a757 | 1316 | goto out_free_irqs; |
e53e97ce DM |
1317 | |
1318 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
1319 | if (hv_err) | |
b7c2a757 | 1320 | goto out_free_irqs; |
e53e97ce DM |
1321 | |
1322 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1323 | if (hv_err) | |
1324 | goto out_unmap_tx; | |
1325 | ||
1326 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); | |
1327 | if (hv_err) | |
1328 | goto out_unmap_tx; | |
1329 | ||
1330 | lp->flags |= LDC_FLAG_REGISTERED_QUEUES; | |
1331 | ||
1332 | hv_err = sun4v_ldc_tx_get_state(lp->id, | |
1333 | &lp->tx_head, | |
1334 | &lp->tx_tail, | |
1335 | &lp->chan_state); | |
1336 | err = -EBUSY; | |
1337 | if (hv_err) | |
1338 | goto out_unmap_rx; | |
1339 | ||
1340 | lp->tx_acked = lp->tx_head; | |
1341 | ||
1342 | lp->hs_state = LDC_HS_OPEN; | |
1343 | ldc_set_state(lp, LDC_STATE_BOUND); | |
1344 | ||
1345 | spin_unlock_irqrestore(&lp->lock, flags); | |
1346 | ||
1347 | return 0; | |
1348 | ||
1349 | out_unmap_rx: | |
1350 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; | |
1351 | sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1352 | ||
1353 | out_unmap_tx: | |
1354 | sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1355 | ||
b7c2a757 | 1356 | out_free_irqs: |
e53e97ce DM |
1357 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
1358 | free_irq(lp->cfg.tx_irq, lp); | |
e53e97ce DM |
1359 | free_irq(lp->cfg.rx_irq, lp); |
1360 | ||
e53e97ce DM |
1361 | spin_unlock_irqrestore(&lp->lock, flags); |
1362 | ||
1363 | return err; | |
1364 | } | |
1365 | EXPORT_SYMBOL(ldc_bind); | |
1366 | ||
1367 | int ldc_connect(struct ldc_channel *lp) | |
1368 | { | |
1369 | unsigned long flags; | |
1370 | int err; | |
1371 | ||
1372 | if (lp->cfg.mode == LDC_MODE_RAW) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | spin_lock_irqsave(&lp->lock, flags); | |
1376 | ||
1377 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || | |
1378 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) || | |
1379 | lp->hs_state != LDC_HS_OPEN) | |
4ec1b010 | 1380 | err = ((lp->hs_state > LDC_HS_OPEN) ? 0 : -EINVAL); |
e53e97ce DM |
1381 | else |
1382 | err = start_handshake(lp); | |
1383 | ||
1384 | spin_unlock_irqrestore(&lp->lock, flags); | |
1385 | ||
1386 | return err; | |
1387 | } | |
1388 | EXPORT_SYMBOL(ldc_connect); | |
1389 | ||
1390 | int ldc_disconnect(struct ldc_channel *lp) | |
1391 | { | |
1392 | unsigned long hv_err, flags; | |
1393 | int err; | |
1394 | ||
1395 | if (lp->cfg.mode == LDC_MODE_RAW) | |
1396 | return -EINVAL; | |
1397 | ||
1398 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || | |
1399 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES)) | |
1400 | return -EINVAL; | |
1401 | ||
1402 | spin_lock_irqsave(&lp->lock, flags); | |
1403 | ||
1404 | err = -ENODEV; | |
1405 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1406 | if (hv_err) | |
1407 | goto out_err; | |
1408 | ||
1409 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
1410 | if (hv_err) | |
1411 | goto out_err; | |
1412 | ||
1413 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1414 | if (hv_err) | |
1415 | goto out_err; | |
1416 | ||
1417 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); | |
1418 | if (hv_err) | |
1419 | goto out_err; | |
1420 | ||
1421 | ldc_set_state(lp, LDC_STATE_BOUND); | |
1422 | lp->hs_state = LDC_HS_OPEN; | |
1423 | lp->flags |= LDC_FLAG_RESET; | |
1424 | ||
1425 | spin_unlock_irqrestore(&lp->lock, flags); | |
1426 | ||
1427 | return 0; | |
1428 | ||
1429 | out_err: | |
1430 | sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1431 | sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1432 | free_irq(lp->cfg.tx_irq, lp); | |
1433 | free_irq(lp->cfg.rx_irq, lp); | |
1434 | lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS | | |
1435 | LDC_FLAG_REGISTERED_QUEUES); | |
1436 | ldc_set_state(lp, LDC_STATE_INIT); | |
1437 | ||
1438 | spin_unlock_irqrestore(&lp->lock, flags); | |
1439 | ||
1440 | return err; | |
1441 | } | |
1442 | EXPORT_SYMBOL(ldc_disconnect); | |
1443 | ||
1444 | int ldc_state(struct ldc_channel *lp) | |
1445 | { | |
1446 | return lp->state; | |
1447 | } | |
1448 | EXPORT_SYMBOL(ldc_state); | |
1449 | ||
1450 | static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) | |
1451 | { | |
1452 | struct ldc_packet *p; | |
1453 | unsigned long new_tail; | |
1454 | int err; | |
1455 | ||
1456 | if (size > LDC_PACKET_SIZE) | |
1457 | return -EMSGSIZE; | |
1458 | ||
1459 | p = data_get_tx_packet(lp, &new_tail); | |
1460 | if (!p) | |
1461 | return -EAGAIN; | |
1462 | ||
1463 | memcpy(p, buf, size); | |
1464 | ||
1465 | err = send_tx_packet(lp, p, new_tail); | |
1466 | if (!err) | |
1467 | err = size; | |
1468 | ||
1469 | return err; | |
1470 | } | |
1471 | ||
1472 | static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size) | |
1473 | { | |
1474 | struct ldc_packet *p; | |
1475 | unsigned long hv_err, new; | |
1476 | int err; | |
1477 | ||
1478 | if (size < LDC_PACKET_SIZE) | |
1479 | return -EINVAL; | |
1480 | ||
1481 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
1482 | &lp->rx_head, | |
1483 | &lp->rx_tail, | |
1484 | &lp->chan_state); | |
1485 | if (hv_err) | |
1486 | return ldc_abort(lp); | |
1487 | ||
1488 | if (lp->chan_state == LDC_CHANNEL_DOWN || | |
1489 | lp->chan_state == LDC_CHANNEL_RESETTING) | |
1490 | return -ECONNRESET; | |
1491 | ||
1492 | if (lp->rx_head == lp->rx_tail) | |
1493 | return 0; | |
1494 | ||
1495 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); | |
1496 | memcpy(buf, p, LDC_PACKET_SIZE); | |
1497 | ||
1498 | new = rx_advance(lp, lp->rx_head); | |
1499 | lp->rx_head = new; | |
1500 | ||
1501 | err = __set_rx_head(lp, new); | |
1502 | if (err < 0) | |
1503 | err = -ECONNRESET; | |
1504 | else | |
1505 | err = LDC_PACKET_SIZE; | |
1506 | ||
1507 | return err; | |
1508 | } | |
1509 | ||
1510 | static const struct ldc_mode_ops raw_ops = { | |
1511 | .write = write_raw, | |
1512 | .read = read_raw, | |
1513 | }; | |
1514 | ||
1515 | static int write_nonraw(struct ldc_channel *lp, const void *buf, | |
1516 | unsigned int size) | |
1517 | { | |
1518 | unsigned long hv_err, tail; | |
1519 | unsigned int copied; | |
1520 | u32 seq; | |
1521 | int err; | |
1522 | ||
1523 | hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, | |
1524 | &lp->chan_state); | |
1525 | if (unlikely(hv_err)) | |
1526 | return -EBUSY; | |
1527 | ||
1528 | if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) | |
1529 | return ldc_abort(lp); | |
1530 | ||
1531 | if (!tx_has_space_for(lp, size)) | |
1532 | return -EAGAIN; | |
1533 | ||
1534 | seq = lp->snd_nxt; | |
1535 | copied = 0; | |
1536 | tail = lp->tx_tail; | |
1537 | while (copied < size) { | |
1538 | struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE); | |
1539 | u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ? | |
1540 | p->u.u_data : | |
1541 | p->u.r.r_data); | |
1542 | int data_len; | |
1543 | ||
1544 | p->type = LDC_DATA; | |
1545 | p->stype = LDC_INFO; | |
1546 | p->ctrl = 0; | |
1547 | ||
1548 | data_len = size - copied; | |
1549 | if (data_len > lp->mss) | |
1550 | data_len = lp->mss; | |
1551 | ||
1552 | BUG_ON(data_len > LDC_LEN); | |
1553 | ||
1554 | p->env = (data_len | | |
1555 | (copied == 0 ? LDC_START : 0) | | |
1556 | (data_len == size - copied ? LDC_STOP : 0)); | |
1557 | ||
1558 | p->seqid = ++seq; | |
1559 | ||
1560 | ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n", | |
1561 | p->type, | |
1562 | p->stype, | |
1563 | p->ctrl, | |
1564 | p->env, | |
1565 | p->seqid); | |
1566 | ||
1567 | memcpy(data, buf, data_len); | |
1568 | buf += data_len; | |
1569 | copied += data_len; | |
1570 | ||
1571 | tail = tx_advance(lp, tail); | |
1572 | } | |
1573 | ||
1574 | err = set_tx_tail(lp, tail); | |
1575 | if (!err) { | |
1576 | lp->snd_nxt = seq; | |
1577 | err = size; | |
1578 | } | |
1579 | ||
1580 | return err; | |
1581 | } | |
1582 | ||
1583 | static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p, | |
1584 | struct ldc_packet *first_frag) | |
1585 | { | |
1586 | int err; | |
1587 | ||
1588 | if (first_frag) | |
1589 | lp->rcv_nxt = first_frag->seqid - 1; | |
1590 | ||
1591 | err = send_data_nack(lp, p); | |
1592 | if (err) | |
1593 | return err; | |
1594 | ||
1595 | err = __set_rx_head(lp, lp->rx_tail); | |
1596 | if (err < 0) | |
1597 | return ldc_abort(lp); | |
1598 | ||
1599 | return 0; | |
1600 | } | |
1601 | ||
1602 | static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p) | |
1603 | { | |
1604 | if (p->stype & LDC_ACK) { | |
1605 | int err = process_data_ack(lp, p); | |
1606 | if (err) | |
1607 | return err; | |
1608 | } | |
1609 | if (p->stype & LDC_NACK) | |
1610 | return ldc_abort(lp); | |
1611 | ||
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head) | |
1616 | { | |
1617 | unsigned long dummy; | |
1618 | int limit = 1000; | |
1619 | ||
1620 | ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n", | |
1621 | cur_head, lp->rx_head, lp->rx_tail); | |
1622 | while (limit-- > 0) { | |
1623 | unsigned long hv_err; | |
1624 | ||
1625 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
1626 | &dummy, | |
1627 | &lp->rx_tail, | |
1628 | &lp->chan_state); | |
1629 | if (hv_err) | |
1630 | return ldc_abort(lp); | |
1631 | ||
e53e97ce DM |
1632 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
1633 | lp->chan_state == LDC_CHANNEL_RESETTING) | |
1634 | return -ECONNRESET; | |
1635 | ||
1636 | if (cur_head != lp->rx_tail) { | |
cb481235 DM |
1637 | ldcdbg(DATA, "DATA WAIT DONE " |
1638 | "head[%lx] tail[%lx] chan_state[%lx]\n", | |
1639 | dummy, lp->rx_tail, lp->chan_state); | |
e53e97ce DM |
1640 | return 0; |
1641 | } | |
1642 | ||
1643 | udelay(1); | |
1644 | } | |
1645 | return -EAGAIN; | |
1646 | } | |
1647 | ||
1648 | static int rx_set_head(struct ldc_channel *lp, unsigned long head) | |
1649 | { | |
1650 | int err = __set_rx_head(lp, head); | |
1651 | ||
1652 | if (err < 0) | |
1653 | return ldc_abort(lp); | |
1654 | ||
1655 | lp->rx_head = head; | |
1656 | return 0; | |
1657 | } | |
1658 | ||
cb481235 DM |
1659 | static void send_data_ack(struct ldc_channel *lp) |
1660 | { | |
1661 | unsigned long new_tail; | |
1662 | struct ldc_packet *p; | |
1663 | ||
1664 | p = data_get_tx_packet(lp, &new_tail); | |
1665 | if (likely(p)) { | |
1666 | int err; | |
1667 | ||
1668 | memset(p, 0, sizeof(*p)); | |
1669 | p->type = LDC_DATA; | |
1670 | p->stype = LDC_ACK; | |
1671 | p->ctrl = 0; | |
1672 | p->seqid = lp->snd_nxt + 1; | |
1673 | p->u.r.ackid = lp->rcv_nxt; | |
1674 | ||
1675 | err = send_tx_packet(lp, p, new_tail); | |
1676 | if (!err) | |
1677 | lp->snd_nxt++; | |
1678 | } | |
1679 | } | |
1680 | ||
e53e97ce DM |
1681 | static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size) |
1682 | { | |
1683 | struct ldc_packet *first_frag; | |
1684 | unsigned long hv_err, new; | |
1685 | int err, copied; | |
1686 | ||
1687 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
1688 | &lp->rx_head, | |
1689 | &lp->rx_tail, | |
1690 | &lp->chan_state); | |
1691 | if (hv_err) | |
1692 | return ldc_abort(lp); | |
1693 | ||
1694 | if (lp->chan_state == LDC_CHANNEL_DOWN || | |
1695 | lp->chan_state == LDC_CHANNEL_RESETTING) | |
1696 | return -ECONNRESET; | |
1697 | ||
1698 | if (lp->rx_head == lp->rx_tail) | |
1699 | return 0; | |
1700 | ||
1701 | first_frag = NULL; | |
1702 | copied = err = 0; | |
1703 | new = lp->rx_head; | |
1704 | while (1) { | |
1705 | struct ldc_packet *p; | |
1706 | int pkt_len; | |
1707 | ||
1708 | BUG_ON(new == lp->rx_tail); | |
1709 | p = lp->rx_base + (new / LDC_PACKET_SIZE); | |
1710 | ||
cb481235 | 1711 | ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " |
e53e97ce DM |
1712 | "rcv_nxt[%08x]\n", |
1713 | p->type, | |
1714 | p->stype, | |
1715 | p->ctrl, | |
1716 | p->env, | |
1717 | p->seqid, | |
cb481235 | 1718 | p->u.r.ackid, |
e53e97ce DM |
1719 | lp->rcv_nxt); |
1720 | ||
1721 | if (unlikely(!rx_seq_ok(lp, p->seqid))) { | |
1722 | err = rx_bad_seq(lp, p, first_frag); | |
1723 | copied = 0; | |
1724 | break; | |
1725 | } | |
1726 | ||
1727 | if (p->type & LDC_CTRL) { | |
1728 | err = process_control_frame(lp, p); | |
1729 | if (err < 0) | |
1730 | break; | |
1731 | err = 0; | |
1732 | } | |
1733 | ||
1734 | lp->rcv_nxt = p->seqid; | |
1735 | ||
1736 | if (!(p->type & LDC_DATA)) { | |
1737 | new = rx_advance(lp, new); | |
1738 | goto no_data; | |
1739 | } | |
1740 | if (p->stype & (LDC_ACK | LDC_NACK)) { | |
1741 | err = data_ack_nack(lp, p); | |
1742 | if (err) | |
1743 | break; | |
1744 | } | |
1745 | if (!(p->stype & LDC_INFO)) { | |
1746 | new = rx_advance(lp, new); | |
cb481235 DM |
1747 | err = rx_set_head(lp, new); |
1748 | if (err) | |
1749 | break; | |
e53e97ce DM |
1750 | goto no_data; |
1751 | } | |
1752 | ||
1753 | pkt_len = p->env & LDC_LEN; | |
1754 | ||
1755 | /* Every initial packet starts with the START bit set. | |
1756 | * | |
1757 | * Singleton packets will have both START+STOP set. | |
1758 | * | |
1759 | * Fragments will have START set in the first frame, STOP | |
1760 | * set in the last frame, and neither bit set in middle | |
1761 | * frames of the packet. | |
1762 | * | |
1763 | * Therefore if we are at the beginning of a packet and | |
1764 | * we don't see START, or we are in the middle of a fragmented | |
1765 | * packet and do see START, we are unsynchronized and should | |
1766 | * flush the RX queue. | |
1767 | */ | |
1768 | if ((first_frag == NULL && !(p->env & LDC_START)) || | |
1769 | (first_frag != NULL && (p->env & LDC_START))) { | |
1770 | if (!first_frag) | |
1771 | new = rx_advance(lp, new); | |
1772 | ||
1773 | err = rx_set_head(lp, new); | |
1774 | if (err) | |
1775 | break; | |
1776 | ||
1777 | if (!first_frag) | |
1778 | goto no_data; | |
1779 | } | |
1780 | if (!first_frag) | |
1781 | first_frag = p; | |
1782 | ||
1783 | if (pkt_len > size - copied) { | |
1784 | /* User didn't give us a big enough buffer, | |
1785 | * what to do? This is a pretty serious error. | |
1786 | * | |
1787 | * Since we haven't updated the RX ring head to | |
1788 | * consume any of the packets, signal the error | |
1789 | * to the user and just leave the RX ring alone. | |
1790 | * | |
1791 | * This seems the best behavior because this allows | |
1792 | * a user of the LDC layer to start with a small | |
1793 | * RX buffer for ldc_read() calls and use -EMSGSIZE | |
1794 | * as a cue to enlarge it's read buffer. | |
1795 | */ | |
1796 | err = -EMSGSIZE; | |
1797 | break; | |
1798 | } | |
1799 | ||
1800 | /* Ok, we are gonna eat this one. */ | |
1801 | new = rx_advance(lp, new); | |
1802 | ||
1803 | memcpy(buf, | |
1804 | (lp->cfg.mode == LDC_MODE_UNRELIABLE ? | |
1805 | p->u.u_data : p->u.r.r_data), pkt_len); | |
1806 | buf += pkt_len; | |
1807 | copied += pkt_len; | |
1808 | ||
1809 | if (p->env & LDC_STOP) | |
1810 | break; | |
1811 | ||
1812 | no_data: | |
1813 | if (new == lp->rx_tail) { | |
1814 | err = rx_data_wait(lp, new); | |
1815 | if (err) | |
1816 | break; | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | if (!err) | |
1821 | err = rx_set_head(lp, new); | |
1822 | ||
1823 | if (err && first_frag) | |
1824 | lp->rcv_nxt = first_frag->seqid - 1; | |
1825 | ||
cb481235 | 1826 | if (!err) { |
e53e97ce | 1827 | err = copied; |
cb481235 DM |
1828 | if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) |
1829 | send_data_ack(lp); | |
1830 | } | |
e53e97ce DM |
1831 | |
1832 | return err; | |
1833 | } | |
1834 | ||
1835 | static const struct ldc_mode_ops nonraw_ops = { | |
1836 | .write = write_nonraw, | |
1837 | .read = read_nonraw, | |
1838 | }; | |
1839 | ||
1840 | static int write_stream(struct ldc_channel *lp, const void *buf, | |
1841 | unsigned int size) | |
1842 | { | |
1843 | if (size > lp->cfg.mtu) | |
1844 | size = lp->cfg.mtu; | |
1845 | return write_nonraw(lp, buf, size); | |
1846 | } | |
1847 | ||
1848 | static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size) | |
1849 | { | |
1850 | if (!lp->mssbuf_len) { | |
cb481235 | 1851 | int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); |
e53e97ce DM |
1852 | if (err < 0) |
1853 | return err; | |
1854 | ||
1855 | lp->mssbuf_len = err; | |
1856 | lp->mssbuf_off = 0; | |
1857 | } | |
1858 | ||
1859 | if (size > lp->mssbuf_len) | |
1860 | size = lp->mssbuf_len; | |
1861 | memcpy(buf, lp->mssbuf + lp->mssbuf_off, size); | |
1862 | ||
1863 | lp->mssbuf_off += size; | |
1864 | lp->mssbuf_len -= size; | |
1865 | ||
1866 | return size; | |
1867 | } | |
1868 | ||
1869 | static const struct ldc_mode_ops stream_ops = { | |
1870 | .write = write_stream, | |
1871 | .read = read_stream, | |
1872 | }; | |
1873 | ||
1874 | int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size) | |
1875 | { | |
1876 | unsigned long flags; | |
1877 | int err; | |
1878 | ||
1879 | if (!buf) | |
1880 | return -EINVAL; | |
1881 | ||
1882 | if (!size) | |
1883 | return 0; | |
1884 | ||
1885 | spin_lock_irqsave(&lp->lock, flags); | |
1886 | ||
1887 | if (lp->hs_state != LDC_HS_COMPLETE) | |
1888 | err = -ENOTCONN; | |
1889 | else | |
1890 | err = lp->mops->write(lp, buf, size); | |
1891 | ||
1892 | spin_unlock_irqrestore(&lp->lock, flags); | |
1893 | ||
1894 | return err; | |
1895 | } | |
1896 | EXPORT_SYMBOL(ldc_write); | |
1897 | ||
1898 | int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size) | |
1899 | { | |
1900 | unsigned long flags; | |
1901 | int err; | |
1902 | ||
1903 | if (!buf) | |
1904 | return -EINVAL; | |
1905 | ||
1906 | if (!size) | |
1907 | return 0; | |
1908 | ||
1909 | spin_lock_irqsave(&lp->lock, flags); | |
1910 | ||
1911 | if (lp->hs_state != LDC_HS_COMPLETE) | |
1912 | err = -ENOTCONN; | |
1913 | else | |
1914 | err = lp->mops->read(lp, buf, size); | |
1915 | ||
1916 | spin_unlock_irqrestore(&lp->lock, flags); | |
1917 | ||
1918 | return err; | |
1919 | } | |
1920 | EXPORT_SYMBOL(ldc_read); | |
1921 | ||
e53e97ce DM |
1922 | static u64 pagesize_code(void) |
1923 | { | |
1924 | switch (PAGE_SIZE) { | |
1925 | default: | |
1926 | case (8ULL * 1024ULL): | |
1927 | return 0; | |
1928 | case (64ULL * 1024ULL): | |
1929 | return 1; | |
1930 | case (512ULL * 1024ULL): | |
1931 | return 2; | |
1932 | case (4ULL * 1024ULL * 1024ULL): | |
1933 | return 3; | |
1934 | case (32ULL * 1024ULL * 1024ULL): | |
1935 | return 4; | |
1936 | case (256ULL * 1024ULL * 1024ULL): | |
1937 | return 5; | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) | |
1942 | { | |
1943 | return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | | |
1944 | (index << PAGE_SHIFT) | | |
1945 | page_offset); | |
1946 | } | |
1947 | ||
e53e97ce DM |
1948 | |
1949 | static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, | |
1950 | unsigned long npages) | |
1951 | { | |
1952 | long entry; | |
1953 | ||
0ae53ed1 SV |
1954 | entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table, |
1955 | npages, NULL, (unsigned long)-1, 0); | |
d618382b | 1956 | if (unlikely(entry == IOMMU_ERROR_CODE)) |
e53e97ce DM |
1957 | return NULL; |
1958 | ||
1959 | return iommu->page_table + entry; | |
1960 | } | |
1961 | ||
1962 | static u64 perm_to_mte(unsigned int map_perm) | |
1963 | { | |
1964 | u64 mte_base; | |
1965 | ||
1966 | mte_base = pagesize_code(); | |
1967 | ||
1968 | if (map_perm & LDC_MAP_SHADOW) { | |
1969 | if (map_perm & LDC_MAP_R) | |
1970 | mte_base |= LDC_MTE_COPY_R; | |
1971 | if (map_perm & LDC_MAP_W) | |
1972 | mte_base |= LDC_MTE_COPY_W; | |
1973 | } | |
1974 | if (map_perm & LDC_MAP_DIRECT) { | |
1975 | if (map_perm & LDC_MAP_R) | |
1976 | mte_base |= LDC_MTE_READ; | |
1977 | if (map_perm & LDC_MAP_W) | |
1978 | mte_base |= LDC_MTE_WRITE; | |
1979 | if (map_perm & LDC_MAP_X) | |
1980 | mte_base |= LDC_MTE_EXEC; | |
1981 | } | |
1982 | if (map_perm & LDC_MAP_IO) { | |
1983 | if (map_perm & LDC_MAP_R) | |
1984 | mte_base |= LDC_MTE_IOMMU_R; | |
1985 | if (map_perm & LDC_MAP_W) | |
1986 | mte_base |= LDC_MTE_IOMMU_W; | |
1987 | } | |
1988 | ||
1989 | return mte_base; | |
1990 | } | |
1991 | ||
1992 | static int pages_in_region(unsigned long base, long len) | |
1993 | { | |
1994 | int count = 0; | |
1995 | ||
1996 | do { | |
1997 | unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; | |
1998 | ||
1999 | len -= (new - base); | |
2000 | base = new; | |
2001 | count++; | |
2002 | } while (len > 0); | |
2003 | ||
2004 | return count; | |
2005 | } | |
2006 | ||
2007 | struct cookie_state { | |
2008 | struct ldc_mtable_entry *page_table; | |
2009 | struct ldc_trans_cookie *cookies; | |
2010 | u64 mte_base; | |
2011 | u64 prev_cookie; | |
2012 | u32 pte_idx; | |
2013 | u32 nc; | |
2014 | }; | |
2015 | ||
2016 | static void fill_cookies(struct cookie_state *sp, unsigned long pa, | |
2017 | unsigned long off, unsigned long len) | |
2018 | { | |
2019 | do { | |
2020 | unsigned long tlen, new = pa + PAGE_SIZE; | |
2021 | u64 this_cookie; | |
2022 | ||
2023 | sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; | |
2024 | ||
2025 | tlen = PAGE_SIZE; | |
2026 | if (off) | |
2027 | tlen = PAGE_SIZE - off; | |
2028 | if (tlen > len) | |
2029 | tlen = len; | |
2030 | ||
2031 | this_cookie = make_cookie(sp->pte_idx, | |
2032 | pagesize_code(), off); | |
2033 | ||
2034 | off = 0; | |
2035 | ||
2036 | if (this_cookie == sp->prev_cookie) { | |
2037 | sp->cookies[sp->nc - 1].cookie_size += tlen; | |
2038 | } else { | |
2039 | sp->cookies[sp->nc].cookie_addr = this_cookie; | |
2040 | sp->cookies[sp->nc].cookie_size = tlen; | |
2041 | sp->nc++; | |
2042 | } | |
2043 | sp->prev_cookie = this_cookie + tlen; | |
2044 | ||
2045 | sp->pte_idx++; | |
2046 | ||
2047 | len -= tlen; | |
2048 | pa = new; | |
2049 | } while (len > 0); | |
2050 | } | |
2051 | ||
2052 | static int sg_count_one(struct scatterlist *sg) | |
2053 | { | |
58b053e4 | 2054 | unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; |
e53e97ce DM |
2055 | long len = sg->length; |
2056 | ||
2057 | if ((sg->offset | len) & (8UL - 1)) | |
2058 | return -EFAULT; | |
2059 | ||
2060 | return pages_in_region(base + sg->offset, len); | |
2061 | } | |
2062 | ||
2063 | static int sg_count_pages(struct scatterlist *sg, int num_sg) | |
2064 | { | |
2065 | int count; | |
2066 | int i; | |
2067 | ||
2068 | count = 0; | |
2069 | for (i = 0; i < num_sg; i++) { | |
2070 | int err = sg_count_one(sg + i); | |
2071 | if (err < 0) | |
2072 | return err; | |
2073 | count += err; | |
2074 | } | |
2075 | ||
2076 | return count; | |
2077 | } | |
2078 | ||
2079 | int ldc_map_sg(struct ldc_channel *lp, | |
2080 | struct scatterlist *sg, int num_sg, | |
2081 | struct ldc_trans_cookie *cookies, int ncookies, | |
2082 | unsigned int map_perm) | |
2083 | { | |
0ae53ed1 | 2084 | unsigned long i, npages; |
e53e97ce DM |
2085 | struct ldc_mtable_entry *base; |
2086 | struct cookie_state state; | |
2087 | struct ldc_iommu *iommu; | |
2088 | int err; | |
8c07a308 | 2089 | struct scatterlist *s; |
e53e97ce DM |
2090 | |
2091 | if (map_perm & ~LDC_MAP_ALL) | |
2092 | return -EINVAL; | |
2093 | ||
2094 | err = sg_count_pages(sg, num_sg); | |
2095 | if (err < 0) | |
2096 | return err; | |
2097 | ||
2098 | npages = err; | |
2099 | if (err > ncookies) | |
2100 | return -EMSGSIZE; | |
2101 | ||
2102 | iommu = &lp->iommu; | |
2103 | ||
e53e97ce | 2104 | base = alloc_npages(iommu, npages); |
e53e97ce DM |
2105 | |
2106 | if (!base) | |
2107 | return -ENOMEM; | |
2108 | ||
2109 | state.page_table = iommu->page_table; | |
2110 | state.cookies = cookies; | |
2111 | state.mte_base = perm_to_mte(map_perm); | |
2112 | state.prev_cookie = ~(u64)0; | |
2113 | state.pte_idx = (base - iommu->page_table); | |
2114 | state.nc = 0; | |
2115 | ||
8c07a308 AM |
2116 | for_each_sg(sg, s, num_sg, i) { |
2117 | fill_cookies(&state, page_to_pfn(sg_page(s)) << PAGE_SHIFT, | |
2118 | s->offset, s->length); | |
2119 | } | |
e53e97ce DM |
2120 | |
2121 | return state.nc; | |
2122 | } | |
2123 | EXPORT_SYMBOL(ldc_map_sg); | |
2124 | ||
2125 | int ldc_map_single(struct ldc_channel *lp, | |
2126 | void *buf, unsigned int len, | |
2127 | struct ldc_trans_cookie *cookies, int ncookies, | |
2128 | unsigned int map_perm) | |
2129 | { | |
0ae53ed1 | 2130 | unsigned long npages, pa; |
e53e97ce DM |
2131 | struct ldc_mtable_entry *base; |
2132 | struct cookie_state state; | |
2133 | struct ldc_iommu *iommu; | |
2134 | ||
2135 | if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) | |
2136 | return -EINVAL; | |
2137 | ||
2138 | pa = __pa(buf); | |
2139 | if ((pa | len) & (8UL - 1)) | |
2140 | return -EFAULT; | |
2141 | ||
2142 | npages = pages_in_region(pa, len); | |
2143 | ||
2144 | iommu = &lp->iommu; | |
2145 | ||
e53e97ce | 2146 | base = alloc_npages(iommu, npages); |
e53e97ce DM |
2147 | |
2148 | if (!base) | |
2149 | return -ENOMEM; | |
2150 | ||
2151 | state.page_table = iommu->page_table; | |
2152 | state.cookies = cookies; | |
2153 | state.mte_base = perm_to_mte(map_perm); | |
2154 | state.prev_cookie = ~(u64)0; | |
2155 | state.pte_idx = (base - iommu->page_table); | |
2156 | state.nc = 0; | |
2157 | fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); | |
42db672d | 2158 | BUG_ON(state.nc > ncookies); |
e53e97ce DM |
2159 | |
2160 | return state.nc; | |
2161 | } | |
2162 | EXPORT_SYMBOL(ldc_map_single); | |
2163 | ||
0ae53ed1 | 2164 | |
e53e97ce DM |
2165 | static void free_npages(unsigned long id, struct ldc_iommu *iommu, |
2166 | u64 cookie, u64 size) | |
2167 | { | |
0ae53ed1 | 2168 | unsigned long npages, entry; |
e53e97ce | 2169 | |
671d7732 | 2170 | npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; |
c12f048f | 2171 | |
0ae53ed1 SV |
2172 | entry = ldc_cookie_to_index(cookie, iommu); |
2173 | ldc_demap(iommu, id, cookie, entry, npages); | |
2174 | iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry); | |
e53e97ce DM |
2175 | } |
2176 | ||
2177 | void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, | |
2178 | int ncookies) | |
2179 | { | |
2180 | struct ldc_iommu *iommu = &lp->iommu; | |
c12f048f | 2181 | int i; |
0ae53ed1 | 2182 | unsigned long flags; |
e53e97ce DM |
2183 | |
2184 | spin_lock_irqsave(&iommu->lock, flags); | |
2185 | for (i = 0; i < ncookies; i++) { | |
2186 | u64 addr = cookies[i].cookie_addr; | |
2187 | u64 size = cookies[i].cookie_size; | |
2188 | ||
2189 | free_npages(lp->id, iommu, addr, size); | |
2190 | } | |
2191 | spin_unlock_irqrestore(&iommu->lock, flags); | |
2192 | } | |
2193 | EXPORT_SYMBOL(ldc_unmap); | |
2194 | ||
2195 | int ldc_copy(struct ldc_channel *lp, int copy_dir, | |
2196 | void *buf, unsigned int len, unsigned long offset, | |
2197 | struct ldc_trans_cookie *cookies, int ncookies) | |
2198 | { | |
2199 | unsigned int orig_len; | |
2200 | unsigned long ra; | |
2201 | int i; | |
2202 | ||
2203 | if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { | |
2204 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n", | |
2205 | lp->id, copy_dir); | |
2206 | return -EINVAL; | |
2207 | } | |
2208 | ||
2209 | ra = __pa(buf); | |
2210 | if ((ra | len | offset) & (8UL - 1)) { | |
2211 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " | |
2212 | "ra[%lx] len[%x] offset[%lx]\n", | |
2213 | lp->id, ra, len, offset); | |
2214 | return -EFAULT; | |
2215 | } | |
2216 | ||
2217 | if (lp->hs_state != LDC_HS_COMPLETE || | |
2218 | (lp->flags & LDC_FLAG_RESET)) { | |
2219 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " | |
2220 | "flags[%x]\n", lp->id, lp->hs_state, lp->flags); | |
2221 | return -ECONNRESET; | |
2222 | } | |
2223 | ||
2224 | orig_len = len; | |
2225 | for (i = 0; i < ncookies; i++) { | |
2226 | unsigned long cookie_raddr = cookies[i].cookie_addr; | |
2227 | unsigned long this_len = cookies[i].cookie_size; | |
2228 | unsigned long actual_len; | |
2229 | ||
2230 | if (unlikely(offset)) { | |
2231 | unsigned long this_off = offset; | |
2232 | ||
2233 | if (this_off > this_len) | |
2234 | this_off = this_len; | |
2235 | ||
2236 | offset -= this_off; | |
2237 | this_len -= this_off; | |
2238 | if (!this_len) | |
2239 | continue; | |
2240 | cookie_raddr += this_off; | |
2241 | } | |
2242 | ||
2243 | if (this_len > len) | |
2244 | this_len = len; | |
2245 | ||
2246 | while (1) { | |
2247 | unsigned long hv_err; | |
2248 | ||
2249 | hv_err = sun4v_ldc_copy(lp->id, copy_dir, | |
2250 | cookie_raddr, ra, | |
2251 | this_len, &actual_len); | |
2252 | if (unlikely(hv_err)) { | |
2253 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] " | |
2254 | "HV error %lu\n", | |
2255 | lp->id, hv_err); | |
2256 | if (lp->hs_state != LDC_HS_COMPLETE || | |
2257 | (lp->flags & LDC_FLAG_RESET)) | |
2258 | return -ECONNRESET; | |
2259 | else | |
2260 | return -EFAULT; | |
2261 | } | |
2262 | ||
2263 | cookie_raddr += actual_len; | |
2264 | ra += actual_len; | |
2265 | len -= actual_len; | |
2266 | if (actual_len == this_len) | |
2267 | break; | |
2268 | ||
2269 | this_len -= actual_len; | |
2270 | } | |
2271 | ||
2272 | if (!len) | |
2273 | break; | |
2274 | } | |
2275 | ||
2276 | /* It is caller policy what to do about short copies. | |
2277 | * For example, a networking driver can declare the | |
2278 | * packet a runt and drop it. | |
2279 | */ | |
2280 | ||
2281 | return orig_len - len; | |
2282 | } | |
2283 | EXPORT_SYMBOL(ldc_copy); | |
2284 | ||
2285 | void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, | |
2286 | struct ldc_trans_cookie *cookies, int *ncookies, | |
2287 | unsigned int map_perm) | |
2288 | { | |
2289 | void *buf; | |
2290 | int err; | |
2291 | ||
2292 | if (len & (8UL - 1)) | |
2293 | return ERR_PTR(-EINVAL); | |
2294 | ||
0edfad59 | 2295 | buf = kzalloc(len, GFP_ATOMIC); |
e53e97ce DM |
2296 | if (!buf) |
2297 | return ERR_PTR(-ENOMEM); | |
2298 | ||
2299 | err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); | |
2300 | if (err < 0) { | |
2301 | kfree(buf); | |
2302 | return ERR_PTR(err); | |
2303 | } | |
2304 | *ncookies = err; | |
2305 | ||
2306 | return buf; | |
2307 | } | |
2308 | EXPORT_SYMBOL(ldc_alloc_exp_dring); | |
2309 | ||
2310 | void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, | |
2311 | struct ldc_trans_cookie *cookies, int ncookies) | |
2312 | { | |
2313 | ldc_unmap(lp, cookies, ncookies); | |
2314 | kfree(buf); | |
2315 | } | |
2316 | EXPORT_SYMBOL(ldc_free_exp_dring); | |
2317 | ||
2318 | static int __init ldc_init(void) | |
2319 | { | |
e53e97ce | 2320 | unsigned long major, minor; |
43fdf274 | 2321 | struct mdesc_handle *hp; |
e53e97ce | 2322 | const u64 *v; |
6fab2600 | 2323 | int err; |
43fdf274 | 2324 | u64 mp; |
e53e97ce | 2325 | |
43fdf274 DM |
2326 | hp = mdesc_grab(); |
2327 | if (!hp) | |
e53e97ce DM |
2328 | return -ENODEV; |
2329 | ||
43fdf274 | 2330 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); |
6fab2600 | 2331 | err = -ENODEV; |
43fdf274 | 2332 | if (mp == MDESC_NODE_NULL) |
6fab2600 | 2333 | goto out; |
43fdf274 DM |
2334 | |
2335 | v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); | |
e53e97ce | 2336 | if (!v) |
6fab2600 | 2337 | goto out; |
e53e97ce DM |
2338 | |
2339 | major = 1; | |
2340 | minor = 0; | |
2341 | if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { | |
2342 | printk(KERN_INFO PFX "Could not register LDOM hvapi.\n"); | |
6fab2600 | 2343 | goto out; |
e53e97ce DM |
2344 | } |
2345 | ||
2346 | printk(KERN_INFO "%s", version); | |
2347 | ||
2348 | if (!*v) { | |
2349 | printk(KERN_INFO PFX "Domaining disabled.\n"); | |
6fab2600 | 2350 | goto out; |
e53e97ce DM |
2351 | } |
2352 | ldom_domaining_enabled = 1; | |
6fab2600 | 2353 | err = 0; |
e53e97ce | 2354 | |
6fab2600 DM |
2355 | out: |
2356 | mdesc_release(hp); | |
2357 | return err; | |
e53e97ce DM |
2358 | } |
2359 | ||
2360 | core_initcall(ldc_init); |