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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> |
e53e97ce DM |
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 ": " | |
b7c2a757 DM |
27 | #define DRV_MODULE_VERSION "1.1" |
28 | #define DRV_MODULE_RELDATE "July 22, 2008" | |
e53e97ce | 29 | |
7c9503b8 | 30 | static char version[] = |
e53e97ce DM |
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 | ||
133f09a1 DM |
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 | ||
e53e97ce DM |
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 | { | |
cb481235 | 247 | if (lp->cfg.mode == LDC_MODE_STREAM) |
e53e97ce DM |
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; | |
cb481235 | 501 | p->seqid = lp->snd_nxt + 1; |
e53e97ce DM |
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; | |
b2c0805f SR |
629 | struct ldc_packet *p; |
630 | unsigned long new_tail; | |
e53e97ce | 631 | |
b2c0805f SR |
632 | if (vp->major == 0 && vp->minor == 0) |
633 | return ldc_abort(lp); | |
634 | ||
635 | vap = find_by_major(vp->major); | |
636 | if (!vap) | |
e53e97ce | 637 | return ldc_abort(lp); |
e53e97ce | 638 | |
b2c0805f | 639 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
e53e97ce DM |
640 | vap, sizeof(*vap), |
641 | &new_tail); | |
b2c0805f SR |
642 | if (!p) |
643 | return ldc_abort(lp); | |
644 | ||
645 | return send_tx_packet(lp, p, new_tail); | |
e53e97ce DM |
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 | } | |
cb481235 | 773 | if (head == lp->tx_tail) |
e53e97ce DM |
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; | |
c6fee081 | 793 | unsigned long orig_state, flags; |
e53e97ce DM |
794 | unsigned int event_mask; |
795 | ||
796 | spin_lock_irqsave(&lp->lock, flags); | |
797 | ||
798 | orig_state = lp->chan_state; | |
c6fee081 DM |
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); | |
e53e97ce DM |
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; | |
c6fee081 | 911 | unsigned long flags, orig_state; |
e53e97ce DM |
912 | unsigned int event_mask = 0; |
913 | ||
914 | spin_lock_irqsave(&lp->lock, flags); | |
915 | ||
916 | orig_state = lp->chan_state; | |
c6fee081 DM |
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); | |
e53e97ce DM |
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; | |
956 | struct hlist_node *n; | |
957 | ||
958 | hlist_for_each_entry(lp, n, &ldc_channel_list, list) { | |
959 | if (lp->id == id) | |
960 | return 1; | |
961 | } | |
962 | return 0; | |
963 | } | |
964 | ||
965 | static int alloc_queue(const char *name, unsigned long num_entries, | |
966 | struct ldc_packet **base, unsigned long *ra) | |
967 | { | |
968 | unsigned long size, order; | |
969 | void *q; | |
970 | ||
971 | size = num_entries * LDC_PACKET_SIZE; | |
972 | order = get_order(size); | |
973 | ||
974 | q = (void *) __get_free_pages(GFP_KERNEL, order); | |
975 | if (!q) { | |
976 | printk(KERN_ERR PFX "Alloc of %s queue failed with " | |
977 | "size=%lu order=%lu\n", name, size, order); | |
978 | return -ENOMEM; | |
979 | } | |
980 | ||
981 | memset(q, 0, PAGE_SIZE << order); | |
982 | ||
983 | *base = q; | |
984 | *ra = __pa(q); | |
985 | ||
986 | return 0; | |
987 | } | |
988 | ||
989 | static void free_queue(unsigned long num_entries, struct ldc_packet *q) | |
990 | { | |
991 | unsigned long size, order; | |
992 | ||
993 | if (!q) | |
994 | return; | |
995 | ||
996 | size = num_entries * LDC_PACKET_SIZE; | |
997 | order = get_order(size); | |
998 | ||
999 | free_pages((unsigned long)q, order); | |
1000 | } | |
1001 | ||
1002 | /* XXX Make this configurable... XXX */ | |
1003 | #define LDC_IOTABLE_SIZE (8 * 1024) | |
1004 | ||
1005 | static int ldc_iommu_init(struct ldc_channel *lp) | |
1006 | { | |
1007 | unsigned long sz, num_tsb_entries, tsbsize, order; | |
1008 | struct ldc_iommu *iommu = &lp->iommu; | |
1009 | struct ldc_mtable_entry *table; | |
1010 | unsigned long hv_err; | |
1011 | int err; | |
1012 | ||
1013 | num_tsb_entries = LDC_IOTABLE_SIZE; | |
1014 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); | |
1015 | ||
1016 | spin_lock_init(&iommu->lock); | |
1017 | ||
1018 | sz = num_tsb_entries / 8; | |
1019 | sz = (sz + 7UL) & ~7UL; | |
1020 | iommu->arena.map = kzalloc(sz, GFP_KERNEL); | |
1021 | if (!iommu->arena.map) { | |
1022 | printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); | |
1023 | return -ENOMEM; | |
1024 | } | |
1025 | ||
1026 | iommu->arena.limit = num_tsb_entries; | |
1027 | ||
1028 | order = get_order(tsbsize); | |
1029 | ||
1030 | table = (struct ldc_mtable_entry *) | |
1031 | __get_free_pages(GFP_KERNEL, order); | |
1032 | err = -ENOMEM; | |
1033 | if (!table) { | |
1034 | printk(KERN_ERR PFX "Alloc of MTE table failed, " | |
1035 | "size=%lu order=%lu\n", tsbsize, order); | |
1036 | goto out_free_map; | |
1037 | } | |
1038 | ||
1039 | memset(table, 0, PAGE_SIZE << order); | |
1040 | ||
1041 | iommu->page_table = table; | |
1042 | ||
1043 | hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), | |
1044 | num_tsb_entries); | |
1045 | err = -EINVAL; | |
1046 | if (hv_err) | |
1047 | goto out_free_table; | |
1048 | ||
1049 | return 0; | |
1050 | ||
1051 | out_free_table: | |
1052 | free_pages((unsigned long) table, order); | |
1053 | iommu->page_table = NULL; | |
1054 | ||
1055 | out_free_map: | |
1056 | kfree(iommu->arena.map); | |
1057 | iommu->arena.map = NULL; | |
1058 | ||
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | static void ldc_iommu_release(struct ldc_channel *lp) | |
1063 | { | |
1064 | struct ldc_iommu *iommu = &lp->iommu; | |
1065 | unsigned long num_tsb_entries, tsbsize, order; | |
1066 | ||
1067 | (void) sun4v_ldc_set_map_table(lp->id, 0, 0); | |
1068 | ||
1069 | num_tsb_entries = iommu->arena.limit; | |
1070 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); | |
1071 | order = get_order(tsbsize); | |
1072 | ||
1073 | free_pages((unsigned long) iommu->page_table, order); | |
1074 | iommu->page_table = NULL; | |
1075 | ||
1076 | kfree(iommu->arena.map); | |
1077 | iommu->arena.map = NULL; | |
1078 | } | |
1079 | ||
1080 | struct ldc_channel *ldc_alloc(unsigned long id, | |
1081 | const struct ldc_channel_config *cfgp, | |
1082 | void *event_arg) | |
1083 | { | |
1084 | struct ldc_channel *lp; | |
1085 | const struct ldc_mode_ops *mops; | |
1086 | unsigned long dummy1, dummy2, hv_err; | |
1087 | u8 mss, *mssbuf; | |
1088 | int err; | |
1089 | ||
1090 | err = -ENODEV; | |
1091 | if (!ldom_domaining_enabled) | |
1092 | goto out_err; | |
1093 | ||
1094 | err = -EINVAL; | |
1095 | if (!cfgp) | |
1096 | goto out_err; | |
1097 | ||
1098 | switch (cfgp->mode) { | |
1099 | case LDC_MODE_RAW: | |
1100 | mops = &raw_ops; | |
1101 | mss = LDC_PACKET_SIZE; | |
1102 | break; | |
1103 | ||
1104 | case LDC_MODE_UNRELIABLE: | |
1105 | mops = &nonraw_ops; | |
1106 | mss = LDC_PACKET_SIZE - 8; | |
1107 | break; | |
1108 | ||
e53e97ce DM |
1109 | case LDC_MODE_STREAM: |
1110 | mops = &stream_ops; | |
1111 | mss = LDC_PACKET_SIZE - 8 - 8; | |
1112 | break; | |
1113 | ||
1114 | default: | |
1115 | goto out_err; | |
1116 | } | |
1117 | ||
1118 | if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) | |
1119 | goto out_err; | |
1120 | ||
1121 | hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); | |
1122 | err = -ENODEV; | |
1123 | if (hv_err == HV_ECHANNEL) | |
1124 | goto out_err; | |
1125 | ||
1126 | err = -EEXIST; | |
1127 | if (__ldc_channel_exists(id)) | |
1128 | goto out_err; | |
1129 | ||
1130 | mssbuf = NULL; | |
1131 | ||
1132 | lp = kzalloc(sizeof(*lp), GFP_KERNEL); | |
1133 | err = -ENOMEM; | |
1134 | if (!lp) | |
1135 | goto out_err; | |
1136 | ||
1137 | spin_lock_init(&lp->lock); | |
1138 | ||
1139 | lp->id = id; | |
1140 | ||
1141 | err = ldc_iommu_init(lp); | |
1142 | if (err) | |
1143 | goto out_free_ldc; | |
1144 | ||
1145 | lp->mops = mops; | |
1146 | lp->mss = mss; | |
1147 | ||
1148 | lp->cfg = *cfgp; | |
1149 | if (!lp->cfg.mtu) | |
1150 | lp->cfg.mtu = LDC_DEFAULT_MTU; | |
1151 | ||
1152 | if (lp->cfg.mode == LDC_MODE_STREAM) { | |
1153 | mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL); | |
1154 | if (!mssbuf) { | |
1155 | err = -ENOMEM; | |
1156 | goto out_free_iommu; | |
1157 | } | |
1158 | lp->mssbuf = mssbuf; | |
1159 | } | |
1160 | ||
1161 | lp->event_arg = event_arg; | |
1162 | ||
1163 | /* XXX allow setting via ldc_channel_config to override defaults | |
1164 | * XXX or use some formula based upon mtu | |
1165 | */ | |
1166 | lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; | |
1167 | lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; | |
1168 | ||
1169 | err = alloc_queue("TX", lp->tx_num_entries, | |
1170 | &lp->tx_base, &lp->tx_ra); | |
1171 | if (err) | |
1172 | goto out_free_mssbuf; | |
1173 | ||
1174 | err = alloc_queue("RX", lp->rx_num_entries, | |
1175 | &lp->rx_base, &lp->rx_ra); | |
1176 | if (err) | |
1177 | goto out_free_txq; | |
1178 | ||
1179 | lp->flags |= LDC_FLAG_ALLOCED_QUEUES; | |
1180 | ||
1181 | lp->hs_state = LDC_HS_CLOSED; | |
1182 | ldc_set_state(lp, LDC_STATE_INIT); | |
1183 | ||
1184 | INIT_HLIST_NODE(&lp->list); | |
1185 | hlist_add_head(&lp->list, &ldc_channel_list); | |
1186 | ||
1187 | INIT_HLIST_HEAD(&lp->mh_list); | |
1188 | ||
1189 | return lp; | |
1190 | ||
1191 | out_free_txq: | |
1192 | free_queue(lp->tx_num_entries, lp->tx_base); | |
1193 | ||
1194 | out_free_mssbuf: | |
ed247e12 | 1195 | kfree(mssbuf); |
e53e97ce DM |
1196 | |
1197 | out_free_iommu: | |
1198 | ldc_iommu_release(lp); | |
1199 | ||
1200 | out_free_ldc: | |
1201 | kfree(lp); | |
1202 | ||
1203 | out_err: | |
1204 | return ERR_PTR(err); | |
1205 | } | |
1206 | EXPORT_SYMBOL(ldc_alloc); | |
1207 | ||
1208 | void ldc_free(struct ldc_channel *lp) | |
1209 | { | |
1210 | if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { | |
1211 | free_irq(lp->cfg.rx_irq, lp); | |
1212 | free_irq(lp->cfg.tx_irq, lp); | |
1213 | } | |
1214 | ||
1215 | if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { | |
1216 | sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1217 | sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1218 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; | |
1219 | } | |
1220 | if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { | |
1221 | free_queue(lp->tx_num_entries, lp->tx_base); | |
1222 | free_queue(lp->rx_num_entries, lp->rx_base); | |
1223 | lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; | |
1224 | } | |
1225 | ||
1226 | hlist_del(&lp->list); | |
1227 | ||
ed247e12 | 1228 | kfree(lp->mssbuf); |
e53e97ce DM |
1229 | |
1230 | ldc_iommu_release(lp); | |
1231 | ||
1232 | kfree(lp); | |
1233 | } | |
1234 | EXPORT_SYMBOL(ldc_free); | |
1235 | ||
1236 | /* Bind the channel. This registers the LDC queues with | |
1237 | * the hypervisor and puts the channel into a pseudo-listening | |
1238 | * state. This does not initiate a handshake, ldc_connect() does | |
1239 | * that. | |
1240 | */ | |
133f09a1 | 1241 | int ldc_bind(struct ldc_channel *lp, const char *name) |
e53e97ce DM |
1242 | { |
1243 | unsigned long hv_err, flags; | |
1244 | int err = -EINVAL; | |
1245 | ||
b7c2a757 DM |
1246 | if (!name || |
1247 | (lp->state != LDC_STATE_INIT)) | |
1248 | return -EINVAL; | |
e53e97ce | 1249 | |
133f09a1 DM |
1250 | snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); |
1251 | snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); | |
1252 | ||
71ba8d44 | 1253 | err = request_irq(lp->cfg.rx_irq, ldc_rx, IRQF_DISABLED, |
133f09a1 | 1254 | lp->rx_irq_name, lp); |
e53e97ce | 1255 | if (err) |
b7c2a757 | 1256 | return err; |
e53e97ce | 1257 | |
71ba8d44 | 1258 | err = request_irq(lp->cfg.tx_irq, ldc_tx, IRQF_DISABLED, |
133f09a1 | 1259 | lp->tx_irq_name, lp); |
b7c2a757 DM |
1260 | if (err) { |
1261 | free_irq(lp->cfg.rx_irq, lp); | |
1262 | return err; | |
1263 | } | |
1264 | ||
e53e97ce | 1265 | |
b7c2a757 DM |
1266 | spin_lock_irqsave(&lp->lock, flags); |
1267 | ||
1268 | enable_irq(lp->cfg.rx_irq); | |
1269 | enable_irq(lp->cfg.tx_irq); | |
e53e97ce DM |
1270 | |
1271 | lp->flags |= LDC_FLAG_REGISTERED_IRQS; | |
1272 | ||
1273 | err = -ENODEV; | |
1274 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1275 | if (hv_err) | |
b7c2a757 | 1276 | goto out_free_irqs; |
e53e97ce DM |
1277 | |
1278 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
1279 | if (hv_err) | |
b7c2a757 | 1280 | goto out_free_irqs; |
e53e97ce DM |
1281 | |
1282 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1283 | if (hv_err) | |
1284 | goto out_unmap_tx; | |
1285 | ||
1286 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); | |
1287 | if (hv_err) | |
1288 | goto out_unmap_tx; | |
1289 | ||
1290 | lp->flags |= LDC_FLAG_REGISTERED_QUEUES; | |
1291 | ||
1292 | hv_err = sun4v_ldc_tx_get_state(lp->id, | |
1293 | &lp->tx_head, | |
1294 | &lp->tx_tail, | |
1295 | &lp->chan_state); | |
1296 | err = -EBUSY; | |
1297 | if (hv_err) | |
1298 | goto out_unmap_rx; | |
1299 | ||
1300 | lp->tx_acked = lp->tx_head; | |
1301 | ||
1302 | lp->hs_state = LDC_HS_OPEN; | |
1303 | ldc_set_state(lp, LDC_STATE_BOUND); | |
1304 | ||
1305 | spin_unlock_irqrestore(&lp->lock, flags); | |
1306 | ||
1307 | return 0; | |
1308 | ||
1309 | out_unmap_rx: | |
1310 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; | |
1311 | sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1312 | ||
1313 | out_unmap_tx: | |
1314 | sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1315 | ||
b7c2a757 | 1316 | out_free_irqs: |
e53e97ce DM |
1317 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
1318 | free_irq(lp->cfg.tx_irq, lp); | |
e53e97ce DM |
1319 | free_irq(lp->cfg.rx_irq, lp); |
1320 | ||
e53e97ce DM |
1321 | spin_unlock_irqrestore(&lp->lock, flags); |
1322 | ||
1323 | return err; | |
1324 | } | |
1325 | EXPORT_SYMBOL(ldc_bind); | |
1326 | ||
1327 | int ldc_connect(struct ldc_channel *lp) | |
1328 | { | |
1329 | unsigned long flags; | |
1330 | int err; | |
1331 | ||
1332 | if (lp->cfg.mode == LDC_MODE_RAW) | |
1333 | return -EINVAL; | |
1334 | ||
1335 | spin_lock_irqsave(&lp->lock, flags); | |
1336 | ||
1337 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || | |
1338 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) || | |
1339 | lp->hs_state != LDC_HS_OPEN) | |
1340 | err = -EINVAL; | |
1341 | else | |
1342 | err = start_handshake(lp); | |
1343 | ||
1344 | spin_unlock_irqrestore(&lp->lock, flags); | |
1345 | ||
1346 | return err; | |
1347 | } | |
1348 | EXPORT_SYMBOL(ldc_connect); | |
1349 | ||
1350 | int ldc_disconnect(struct ldc_channel *lp) | |
1351 | { | |
1352 | unsigned long hv_err, flags; | |
1353 | int err; | |
1354 | ||
1355 | if (lp->cfg.mode == LDC_MODE_RAW) | |
1356 | return -EINVAL; | |
1357 | ||
1358 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || | |
1359 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES)) | |
1360 | return -EINVAL; | |
1361 | ||
1362 | spin_lock_irqsave(&lp->lock, flags); | |
1363 | ||
1364 | err = -ENODEV; | |
1365 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1366 | if (hv_err) | |
1367 | goto out_err; | |
1368 | ||
1369 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
1370 | if (hv_err) | |
1371 | goto out_err; | |
1372 | ||
1373 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1374 | if (hv_err) | |
1375 | goto out_err; | |
1376 | ||
1377 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); | |
1378 | if (hv_err) | |
1379 | goto out_err; | |
1380 | ||
1381 | ldc_set_state(lp, LDC_STATE_BOUND); | |
1382 | lp->hs_state = LDC_HS_OPEN; | |
1383 | lp->flags |= LDC_FLAG_RESET; | |
1384 | ||
1385 | spin_unlock_irqrestore(&lp->lock, flags); | |
1386 | ||
1387 | return 0; | |
1388 | ||
1389 | out_err: | |
1390 | sun4v_ldc_tx_qconf(lp->id, 0, 0); | |
1391 | sun4v_ldc_rx_qconf(lp->id, 0, 0); | |
1392 | free_irq(lp->cfg.tx_irq, lp); | |
1393 | free_irq(lp->cfg.rx_irq, lp); | |
1394 | lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS | | |
1395 | LDC_FLAG_REGISTERED_QUEUES); | |
1396 | ldc_set_state(lp, LDC_STATE_INIT); | |
1397 | ||
1398 | spin_unlock_irqrestore(&lp->lock, flags); | |
1399 | ||
1400 | return err; | |
1401 | } | |
1402 | EXPORT_SYMBOL(ldc_disconnect); | |
1403 | ||
1404 | int ldc_state(struct ldc_channel *lp) | |
1405 | { | |
1406 | return lp->state; | |
1407 | } | |
1408 | EXPORT_SYMBOL(ldc_state); | |
1409 | ||
1410 | static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) | |
1411 | { | |
1412 | struct ldc_packet *p; | |
1413 | unsigned long new_tail; | |
1414 | int err; | |
1415 | ||
1416 | if (size > LDC_PACKET_SIZE) | |
1417 | return -EMSGSIZE; | |
1418 | ||
1419 | p = data_get_tx_packet(lp, &new_tail); | |
1420 | if (!p) | |
1421 | return -EAGAIN; | |
1422 | ||
1423 | memcpy(p, buf, size); | |
1424 | ||
1425 | err = send_tx_packet(lp, p, new_tail); | |
1426 | if (!err) | |
1427 | err = size; | |
1428 | ||
1429 | return err; | |
1430 | } | |
1431 | ||
1432 | static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size) | |
1433 | { | |
1434 | struct ldc_packet *p; | |
1435 | unsigned long hv_err, new; | |
1436 | int err; | |
1437 | ||
1438 | if (size < LDC_PACKET_SIZE) | |
1439 | return -EINVAL; | |
1440 | ||
1441 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
1442 | &lp->rx_head, | |
1443 | &lp->rx_tail, | |
1444 | &lp->chan_state); | |
1445 | if (hv_err) | |
1446 | return ldc_abort(lp); | |
1447 | ||
1448 | if (lp->chan_state == LDC_CHANNEL_DOWN || | |
1449 | lp->chan_state == LDC_CHANNEL_RESETTING) | |
1450 | return -ECONNRESET; | |
1451 | ||
1452 | if (lp->rx_head == lp->rx_tail) | |
1453 | return 0; | |
1454 | ||
1455 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); | |
1456 | memcpy(buf, p, LDC_PACKET_SIZE); | |
1457 | ||
1458 | new = rx_advance(lp, lp->rx_head); | |
1459 | lp->rx_head = new; | |
1460 | ||
1461 | err = __set_rx_head(lp, new); | |
1462 | if (err < 0) | |
1463 | err = -ECONNRESET; | |
1464 | else | |
1465 | err = LDC_PACKET_SIZE; | |
1466 | ||
1467 | return err; | |
1468 | } | |
1469 | ||
1470 | static const struct ldc_mode_ops raw_ops = { | |
1471 | .write = write_raw, | |
1472 | .read = read_raw, | |
1473 | }; | |
1474 | ||
1475 | static int write_nonraw(struct ldc_channel *lp, const void *buf, | |
1476 | unsigned int size) | |
1477 | { | |
1478 | unsigned long hv_err, tail; | |
1479 | unsigned int copied; | |
1480 | u32 seq; | |
1481 | int err; | |
1482 | ||
1483 | hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, | |
1484 | &lp->chan_state); | |
1485 | if (unlikely(hv_err)) | |
1486 | return -EBUSY; | |
1487 | ||
1488 | if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) | |
1489 | return ldc_abort(lp); | |
1490 | ||
1491 | if (!tx_has_space_for(lp, size)) | |
1492 | return -EAGAIN; | |
1493 | ||
1494 | seq = lp->snd_nxt; | |
1495 | copied = 0; | |
1496 | tail = lp->tx_tail; | |
1497 | while (copied < size) { | |
1498 | struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE); | |
1499 | u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ? | |
1500 | p->u.u_data : | |
1501 | p->u.r.r_data); | |
1502 | int data_len; | |
1503 | ||
1504 | p->type = LDC_DATA; | |
1505 | p->stype = LDC_INFO; | |
1506 | p->ctrl = 0; | |
1507 | ||
1508 | data_len = size - copied; | |
1509 | if (data_len > lp->mss) | |
1510 | data_len = lp->mss; | |
1511 | ||
1512 | BUG_ON(data_len > LDC_LEN); | |
1513 | ||
1514 | p->env = (data_len | | |
1515 | (copied == 0 ? LDC_START : 0) | | |
1516 | (data_len == size - copied ? LDC_STOP : 0)); | |
1517 | ||
1518 | p->seqid = ++seq; | |
1519 | ||
1520 | ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n", | |
1521 | p->type, | |
1522 | p->stype, | |
1523 | p->ctrl, | |
1524 | p->env, | |
1525 | p->seqid); | |
1526 | ||
1527 | memcpy(data, buf, data_len); | |
1528 | buf += data_len; | |
1529 | copied += data_len; | |
1530 | ||
1531 | tail = tx_advance(lp, tail); | |
1532 | } | |
1533 | ||
1534 | err = set_tx_tail(lp, tail); | |
1535 | if (!err) { | |
1536 | lp->snd_nxt = seq; | |
1537 | err = size; | |
1538 | } | |
1539 | ||
1540 | return err; | |
1541 | } | |
1542 | ||
1543 | static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p, | |
1544 | struct ldc_packet *first_frag) | |
1545 | { | |
1546 | int err; | |
1547 | ||
1548 | if (first_frag) | |
1549 | lp->rcv_nxt = first_frag->seqid - 1; | |
1550 | ||
1551 | err = send_data_nack(lp, p); | |
1552 | if (err) | |
1553 | return err; | |
1554 | ||
1555 | err = __set_rx_head(lp, lp->rx_tail); | |
1556 | if (err < 0) | |
1557 | return ldc_abort(lp); | |
1558 | ||
1559 | return 0; | |
1560 | } | |
1561 | ||
1562 | static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p) | |
1563 | { | |
1564 | if (p->stype & LDC_ACK) { | |
1565 | int err = process_data_ack(lp, p); | |
1566 | if (err) | |
1567 | return err; | |
1568 | } | |
1569 | if (p->stype & LDC_NACK) | |
1570 | return ldc_abort(lp); | |
1571 | ||
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head) | |
1576 | { | |
1577 | unsigned long dummy; | |
1578 | int limit = 1000; | |
1579 | ||
1580 | ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n", | |
1581 | cur_head, lp->rx_head, lp->rx_tail); | |
1582 | while (limit-- > 0) { | |
1583 | unsigned long hv_err; | |
1584 | ||
1585 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
1586 | &dummy, | |
1587 | &lp->rx_tail, | |
1588 | &lp->chan_state); | |
1589 | if (hv_err) | |
1590 | return ldc_abort(lp); | |
1591 | ||
e53e97ce DM |
1592 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
1593 | lp->chan_state == LDC_CHANNEL_RESETTING) | |
1594 | return -ECONNRESET; | |
1595 | ||
1596 | if (cur_head != lp->rx_tail) { | |
cb481235 DM |
1597 | ldcdbg(DATA, "DATA WAIT DONE " |
1598 | "head[%lx] tail[%lx] chan_state[%lx]\n", | |
1599 | dummy, lp->rx_tail, lp->chan_state); | |
e53e97ce DM |
1600 | return 0; |
1601 | } | |
1602 | ||
1603 | udelay(1); | |
1604 | } | |
1605 | return -EAGAIN; | |
1606 | } | |
1607 | ||
1608 | static int rx_set_head(struct ldc_channel *lp, unsigned long head) | |
1609 | { | |
1610 | int err = __set_rx_head(lp, head); | |
1611 | ||
1612 | if (err < 0) | |
1613 | return ldc_abort(lp); | |
1614 | ||
1615 | lp->rx_head = head; | |
1616 | return 0; | |
1617 | } | |
1618 | ||
cb481235 DM |
1619 | static void send_data_ack(struct ldc_channel *lp) |
1620 | { | |
1621 | unsigned long new_tail; | |
1622 | struct ldc_packet *p; | |
1623 | ||
1624 | p = data_get_tx_packet(lp, &new_tail); | |
1625 | if (likely(p)) { | |
1626 | int err; | |
1627 | ||
1628 | memset(p, 0, sizeof(*p)); | |
1629 | p->type = LDC_DATA; | |
1630 | p->stype = LDC_ACK; | |
1631 | p->ctrl = 0; | |
1632 | p->seqid = lp->snd_nxt + 1; | |
1633 | p->u.r.ackid = lp->rcv_nxt; | |
1634 | ||
1635 | err = send_tx_packet(lp, p, new_tail); | |
1636 | if (!err) | |
1637 | lp->snd_nxt++; | |
1638 | } | |
1639 | } | |
1640 | ||
e53e97ce DM |
1641 | static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size) |
1642 | { | |
1643 | struct ldc_packet *first_frag; | |
1644 | unsigned long hv_err, new; | |
1645 | int err, copied; | |
1646 | ||
1647 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
1648 | &lp->rx_head, | |
1649 | &lp->rx_tail, | |
1650 | &lp->chan_state); | |
1651 | if (hv_err) | |
1652 | return ldc_abort(lp); | |
1653 | ||
1654 | if (lp->chan_state == LDC_CHANNEL_DOWN || | |
1655 | lp->chan_state == LDC_CHANNEL_RESETTING) | |
1656 | return -ECONNRESET; | |
1657 | ||
1658 | if (lp->rx_head == lp->rx_tail) | |
1659 | return 0; | |
1660 | ||
1661 | first_frag = NULL; | |
1662 | copied = err = 0; | |
1663 | new = lp->rx_head; | |
1664 | while (1) { | |
1665 | struct ldc_packet *p; | |
1666 | int pkt_len; | |
1667 | ||
1668 | BUG_ON(new == lp->rx_tail); | |
1669 | p = lp->rx_base + (new / LDC_PACKET_SIZE); | |
1670 | ||
cb481235 | 1671 | ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " |
e53e97ce DM |
1672 | "rcv_nxt[%08x]\n", |
1673 | p->type, | |
1674 | p->stype, | |
1675 | p->ctrl, | |
1676 | p->env, | |
1677 | p->seqid, | |
cb481235 | 1678 | p->u.r.ackid, |
e53e97ce DM |
1679 | lp->rcv_nxt); |
1680 | ||
1681 | if (unlikely(!rx_seq_ok(lp, p->seqid))) { | |
1682 | err = rx_bad_seq(lp, p, first_frag); | |
1683 | copied = 0; | |
1684 | break; | |
1685 | } | |
1686 | ||
1687 | if (p->type & LDC_CTRL) { | |
1688 | err = process_control_frame(lp, p); | |
1689 | if (err < 0) | |
1690 | break; | |
1691 | err = 0; | |
1692 | } | |
1693 | ||
1694 | lp->rcv_nxt = p->seqid; | |
1695 | ||
1696 | if (!(p->type & LDC_DATA)) { | |
1697 | new = rx_advance(lp, new); | |
1698 | goto no_data; | |
1699 | } | |
1700 | if (p->stype & (LDC_ACK | LDC_NACK)) { | |
1701 | err = data_ack_nack(lp, p); | |
1702 | if (err) | |
1703 | break; | |
1704 | } | |
1705 | if (!(p->stype & LDC_INFO)) { | |
1706 | new = rx_advance(lp, new); | |
cb481235 DM |
1707 | err = rx_set_head(lp, new); |
1708 | if (err) | |
1709 | break; | |
e53e97ce DM |
1710 | goto no_data; |
1711 | } | |
1712 | ||
1713 | pkt_len = p->env & LDC_LEN; | |
1714 | ||
1715 | /* Every initial packet starts with the START bit set. | |
1716 | * | |
1717 | * Singleton packets will have both START+STOP set. | |
1718 | * | |
1719 | * Fragments will have START set in the first frame, STOP | |
1720 | * set in the last frame, and neither bit set in middle | |
1721 | * frames of the packet. | |
1722 | * | |
1723 | * Therefore if we are at the beginning of a packet and | |
1724 | * we don't see START, or we are in the middle of a fragmented | |
1725 | * packet and do see START, we are unsynchronized and should | |
1726 | * flush the RX queue. | |
1727 | */ | |
1728 | if ((first_frag == NULL && !(p->env & LDC_START)) || | |
1729 | (first_frag != NULL && (p->env & LDC_START))) { | |
1730 | if (!first_frag) | |
1731 | new = rx_advance(lp, new); | |
1732 | ||
1733 | err = rx_set_head(lp, new); | |
1734 | if (err) | |
1735 | break; | |
1736 | ||
1737 | if (!first_frag) | |
1738 | goto no_data; | |
1739 | } | |
1740 | if (!first_frag) | |
1741 | first_frag = p; | |
1742 | ||
1743 | if (pkt_len > size - copied) { | |
1744 | /* User didn't give us a big enough buffer, | |
1745 | * what to do? This is a pretty serious error. | |
1746 | * | |
1747 | * Since we haven't updated the RX ring head to | |
1748 | * consume any of the packets, signal the error | |
1749 | * to the user and just leave the RX ring alone. | |
1750 | * | |
1751 | * This seems the best behavior because this allows | |
1752 | * a user of the LDC layer to start with a small | |
1753 | * RX buffer for ldc_read() calls and use -EMSGSIZE | |
1754 | * as a cue to enlarge it's read buffer. | |
1755 | */ | |
1756 | err = -EMSGSIZE; | |
1757 | break; | |
1758 | } | |
1759 | ||
1760 | /* Ok, we are gonna eat this one. */ | |
1761 | new = rx_advance(lp, new); | |
1762 | ||
1763 | memcpy(buf, | |
1764 | (lp->cfg.mode == LDC_MODE_UNRELIABLE ? | |
1765 | p->u.u_data : p->u.r.r_data), pkt_len); | |
1766 | buf += pkt_len; | |
1767 | copied += pkt_len; | |
1768 | ||
1769 | if (p->env & LDC_STOP) | |
1770 | break; | |
1771 | ||
1772 | no_data: | |
1773 | if (new == lp->rx_tail) { | |
1774 | err = rx_data_wait(lp, new); | |
1775 | if (err) | |
1776 | break; | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | if (!err) | |
1781 | err = rx_set_head(lp, new); | |
1782 | ||
1783 | if (err && first_frag) | |
1784 | lp->rcv_nxt = first_frag->seqid - 1; | |
1785 | ||
cb481235 | 1786 | if (!err) { |
e53e97ce | 1787 | err = copied; |
cb481235 DM |
1788 | if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) |
1789 | send_data_ack(lp); | |
1790 | } | |
e53e97ce DM |
1791 | |
1792 | return err; | |
1793 | } | |
1794 | ||
1795 | static const struct ldc_mode_ops nonraw_ops = { | |
1796 | .write = write_nonraw, | |
1797 | .read = read_nonraw, | |
1798 | }; | |
1799 | ||
1800 | static int write_stream(struct ldc_channel *lp, const void *buf, | |
1801 | unsigned int size) | |
1802 | { | |
1803 | if (size > lp->cfg.mtu) | |
1804 | size = lp->cfg.mtu; | |
1805 | return write_nonraw(lp, buf, size); | |
1806 | } | |
1807 | ||
1808 | static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size) | |
1809 | { | |
1810 | if (!lp->mssbuf_len) { | |
cb481235 | 1811 | int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); |
e53e97ce DM |
1812 | if (err < 0) |
1813 | return err; | |
1814 | ||
1815 | lp->mssbuf_len = err; | |
1816 | lp->mssbuf_off = 0; | |
1817 | } | |
1818 | ||
1819 | if (size > lp->mssbuf_len) | |
1820 | size = lp->mssbuf_len; | |
1821 | memcpy(buf, lp->mssbuf + lp->mssbuf_off, size); | |
1822 | ||
1823 | lp->mssbuf_off += size; | |
1824 | lp->mssbuf_len -= size; | |
1825 | ||
1826 | return size; | |
1827 | } | |
1828 | ||
1829 | static const struct ldc_mode_ops stream_ops = { | |
1830 | .write = write_stream, | |
1831 | .read = read_stream, | |
1832 | }; | |
1833 | ||
1834 | int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size) | |
1835 | { | |
1836 | unsigned long flags; | |
1837 | int err; | |
1838 | ||
1839 | if (!buf) | |
1840 | return -EINVAL; | |
1841 | ||
1842 | if (!size) | |
1843 | return 0; | |
1844 | ||
1845 | spin_lock_irqsave(&lp->lock, flags); | |
1846 | ||
1847 | if (lp->hs_state != LDC_HS_COMPLETE) | |
1848 | err = -ENOTCONN; | |
1849 | else | |
1850 | err = lp->mops->write(lp, buf, size); | |
1851 | ||
1852 | spin_unlock_irqrestore(&lp->lock, flags); | |
1853 | ||
1854 | return err; | |
1855 | } | |
1856 | EXPORT_SYMBOL(ldc_write); | |
1857 | ||
1858 | int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size) | |
1859 | { | |
1860 | unsigned long flags; | |
1861 | int err; | |
1862 | ||
1863 | if (!buf) | |
1864 | return -EINVAL; | |
1865 | ||
1866 | if (!size) | |
1867 | return 0; | |
1868 | ||
1869 | spin_lock_irqsave(&lp->lock, flags); | |
1870 | ||
1871 | if (lp->hs_state != LDC_HS_COMPLETE) | |
1872 | err = -ENOTCONN; | |
1873 | else | |
1874 | err = lp->mops->read(lp, buf, size); | |
1875 | ||
1876 | spin_unlock_irqrestore(&lp->lock, flags); | |
1877 | ||
1878 | return err; | |
1879 | } | |
1880 | EXPORT_SYMBOL(ldc_read); | |
1881 | ||
1882 | static long arena_alloc(struct ldc_iommu *iommu, unsigned long npages) | |
1883 | { | |
1884 | struct iommu_arena *arena = &iommu->arena; | |
e756fd80 | 1885 | unsigned long n, start, end, limit; |
e53e97ce DM |
1886 | int pass; |
1887 | ||
1888 | limit = arena->limit; | |
1889 | start = arena->hint; | |
1890 | pass = 0; | |
1891 | ||
1892 | again: | |
e756fd80 | 1893 | n = bitmap_find_next_zero_area(arena->map, limit, start, npages, 0); |
e53e97ce DM |
1894 | end = n + npages; |
1895 | if (unlikely(end >= limit)) { | |
1896 | if (likely(pass < 1)) { | |
1897 | limit = start; | |
1898 | start = 0; | |
1899 | pass++; | |
1900 | goto again; | |
1901 | } else { | |
1902 | /* Scanned the whole thing, give up. */ | |
1903 | return -1; | |
1904 | } | |
1905 | } | |
e756fd80 | 1906 | bitmap_set(arena->map, n, npages); |
e53e97ce DM |
1907 | |
1908 | arena->hint = end; | |
1909 | ||
1910 | return n; | |
1911 | } | |
1912 | ||
1913 | #define COOKIE_PGSZ_CODE 0xf000000000000000ULL | |
1914 | #define COOKIE_PGSZ_CODE_SHIFT 60ULL | |
1915 | ||
1916 | static u64 pagesize_code(void) | |
1917 | { | |
1918 | switch (PAGE_SIZE) { | |
1919 | default: | |
1920 | case (8ULL * 1024ULL): | |
1921 | return 0; | |
1922 | case (64ULL * 1024ULL): | |
1923 | return 1; | |
1924 | case (512ULL * 1024ULL): | |
1925 | return 2; | |
1926 | case (4ULL * 1024ULL * 1024ULL): | |
1927 | return 3; | |
1928 | case (32ULL * 1024ULL * 1024ULL): | |
1929 | return 4; | |
1930 | case (256ULL * 1024ULL * 1024ULL): | |
1931 | return 5; | |
1932 | } | |
1933 | } | |
1934 | ||
1935 | static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) | |
1936 | { | |
1937 | return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | | |
1938 | (index << PAGE_SHIFT) | | |
1939 | page_offset); | |
1940 | } | |
1941 | ||
1942 | static u64 cookie_to_index(u64 cookie, unsigned long *shift) | |
1943 | { | |
1944 | u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; | |
1945 | ||
1946 | cookie &= ~COOKIE_PGSZ_CODE; | |
1947 | ||
1948 | *shift = szcode * 3; | |
1949 | ||
1950 | return (cookie >> (13ULL + (szcode * 3ULL))); | |
1951 | } | |
1952 | ||
1953 | static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, | |
1954 | unsigned long npages) | |
1955 | { | |
1956 | long entry; | |
1957 | ||
1958 | entry = arena_alloc(iommu, npages); | |
1959 | if (unlikely(entry < 0)) | |
1960 | return NULL; | |
1961 | ||
1962 | return iommu->page_table + entry; | |
1963 | } | |
1964 | ||
1965 | static u64 perm_to_mte(unsigned int map_perm) | |
1966 | { | |
1967 | u64 mte_base; | |
1968 | ||
1969 | mte_base = pagesize_code(); | |
1970 | ||
1971 | if (map_perm & LDC_MAP_SHADOW) { | |
1972 | if (map_perm & LDC_MAP_R) | |
1973 | mte_base |= LDC_MTE_COPY_R; | |
1974 | if (map_perm & LDC_MAP_W) | |
1975 | mte_base |= LDC_MTE_COPY_W; | |
1976 | } | |
1977 | if (map_perm & LDC_MAP_DIRECT) { | |
1978 | if (map_perm & LDC_MAP_R) | |
1979 | mte_base |= LDC_MTE_READ; | |
1980 | if (map_perm & LDC_MAP_W) | |
1981 | mte_base |= LDC_MTE_WRITE; | |
1982 | if (map_perm & LDC_MAP_X) | |
1983 | mte_base |= LDC_MTE_EXEC; | |
1984 | } | |
1985 | if (map_perm & LDC_MAP_IO) { | |
1986 | if (map_perm & LDC_MAP_R) | |
1987 | mte_base |= LDC_MTE_IOMMU_R; | |
1988 | if (map_perm & LDC_MAP_W) | |
1989 | mte_base |= LDC_MTE_IOMMU_W; | |
1990 | } | |
1991 | ||
1992 | return mte_base; | |
1993 | } | |
1994 | ||
1995 | static int pages_in_region(unsigned long base, long len) | |
1996 | { | |
1997 | int count = 0; | |
1998 | ||
1999 | do { | |
2000 | unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; | |
2001 | ||
2002 | len -= (new - base); | |
2003 | base = new; | |
2004 | count++; | |
2005 | } while (len > 0); | |
2006 | ||
2007 | return count; | |
2008 | } | |
2009 | ||
2010 | struct cookie_state { | |
2011 | struct ldc_mtable_entry *page_table; | |
2012 | struct ldc_trans_cookie *cookies; | |
2013 | u64 mte_base; | |
2014 | u64 prev_cookie; | |
2015 | u32 pte_idx; | |
2016 | u32 nc; | |
2017 | }; | |
2018 | ||
2019 | static void fill_cookies(struct cookie_state *sp, unsigned long pa, | |
2020 | unsigned long off, unsigned long len) | |
2021 | { | |
2022 | do { | |
2023 | unsigned long tlen, new = pa + PAGE_SIZE; | |
2024 | u64 this_cookie; | |
2025 | ||
2026 | sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; | |
2027 | ||
2028 | tlen = PAGE_SIZE; | |
2029 | if (off) | |
2030 | tlen = PAGE_SIZE - off; | |
2031 | if (tlen > len) | |
2032 | tlen = len; | |
2033 | ||
2034 | this_cookie = make_cookie(sp->pte_idx, | |
2035 | pagesize_code(), off); | |
2036 | ||
2037 | off = 0; | |
2038 | ||
2039 | if (this_cookie == sp->prev_cookie) { | |
2040 | sp->cookies[sp->nc - 1].cookie_size += tlen; | |
2041 | } else { | |
2042 | sp->cookies[sp->nc].cookie_addr = this_cookie; | |
2043 | sp->cookies[sp->nc].cookie_size = tlen; | |
2044 | sp->nc++; | |
2045 | } | |
2046 | sp->prev_cookie = this_cookie + tlen; | |
2047 | ||
2048 | sp->pte_idx++; | |
2049 | ||
2050 | len -= tlen; | |
2051 | pa = new; | |
2052 | } while (len > 0); | |
2053 | } | |
2054 | ||
2055 | static int sg_count_one(struct scatterlist *sg) | |
2056 | { | |
58b053e4 | 2057 | unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; |
e53e97ce DM |
2058 | long len = sg->length; |
2059 | ||
2060 | if ((sg->offset | len) & (8UL - 1)) | |
2061 | return -EFAULT; | |
2062 | ||
2063 | return pages_in_region(base + sg->offset, len); | |
2064 | } | |
2065 | ||
2066 | static int sg_count_pages(struct scatterlist *sg, int num_sg) | |
2067 | { | |
2068 | int count; | |
2069 | int i; | |
2070 | ||
2071 | count = 0; | |
2072 | for (i = 0; i < num_sg; i++) { | |
2073 | int err = sg_count_one(sg + i); | |
2074 | if (err < 0) | |
2075 | return err; | |
2076 | count += err; | |
2077 | } | |
2078 | ||
2079 | return count; | |
2080 | } | |
2081 | ||
2082 | int ldc_map_sg(struct ldc_channel *lp, | |
2083 | struct scatterlist *sg, int num_sg, | |
2084 | struct ldc_trans_cookie *cookies, int ncookies, | |
2085 | unsigned int map_perm) | |
2086 | { | |
2087 | unsigned long i, npages, flags; | |
2088 | struct ldc_mtable_entry *base; | |
2089 | struct cookie_state state; | |
2090 | struct ldc_iommu *iommu; | |
2091 | int err; | |
2092 | ||
2093 | if (map_perm & ~LDC_MAP_ALL) | |
2094 | return -EINVAL; | |
2095 | ||
2096 | err = sg_count_pages(sg, num_sg); | |
2097 | if (err < 0) | |
2098 | return err; | |
2099 | ||
2100 | npages = err; | |
2101 | if (err > ncookies) | |
2102 | return -EMSGSIZE; | |
2103 | ||
2104 | iommu = &lp->iommu; | |
2105 | ||
2106 | spin_lock_irqsave(&iommu->lock, flags); | |
2107 | base = alloc_npages(iommu, npages); | |
2108 | spin_unlock_irqrestore(&iommu->lock, flags); | |
2109 | ||
2110 | if (!base) | |
2111 | return -ENOMEM; | |
2112 | ||
2113 | state.page_table = iommu->page_table; | |
2114 | state.cookies = cookies; | |
2115 | state.mte_base = perm_to_mte(map_perm); | |
2116 | state.prev_cookie = ~(u64)0; | |
2117 | state.pte_idx = (base - iommu->page_table); | |
2118 | state.nc = 0; | |
2119 | ||
2120 | for (i = 0; i < num_sg; i++) | |
d91c5e88 | 2121 | fill_cookies(&state, page_to_pfn(sg_page(&sg[i])) << PAGE_SHIFT, |
e53e97ce DM |
2122 | sg[i].offset, sg[i].length); |
2123 | ||
2124 | return state.nc; | |
2125 | } | |
2126 | EXPORT_SYMBOL(ldc_map_sg); | |
2127 | ||
2128 | int ldc_map_single(struct ldc_channel *lp, | |
2129 | void *buf, unsigned int len, | |
2130 | struct ldc_trans_cookie *cookies, int ncookies, | |
2131 | unsigned int map_perm) | |
2132 | { | |
2133 | unsigned long npages, pa, flags; | |
2134 | struct ldc_mtable_entry *base; | |
2135 | struct cookie_state state; | |
2136 | struct ldc_iommu *iommu; | |
2137 | ||
2138 | if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) | |
2139 | return -EINVAL; | |
2140 | ||
2141 | pa = __pa(buf); | |
2142 | if ((pa | len) & (8UL - 1)) | |
2143 | return -EFAULT; | |
2144 | ||
2145 | npages = pages_in_region(pa, len); | |
2146 | ||
2147 | iommu = &lp->iommu; | |
2148 | ||
2149 | spin_lock_irqsave(&iommu->lock, flags); | |
2150 | base = alloc_npages(iommu, npages); | |
2151 | spin_unlock_irqrestore(&iommu->lock, flags); | |
2152 | ||
2153 | if (!base) | |
2154 | return -ENOMEM; | |
2155 | ||
2156 | state.page_table = iommu->page_table; | |
2157 | state.cookies = cookies; | |
2158 | state.mte_base = perm_to_mte(map_perm); | |
2159 | state.prev_cookie = ~(u64)0; | |
2160 | state.pte_idx = (base - iommu->page_table); | |
2161 | state.nc = 0; | |
2162 | fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); | |
2163 | BUG_ON(state.nc != 1); | |
2164 | ||
2165 | return state.nc; | |
2166 | } | |
2167 | EXPORT_SYMBOL(ldc_map_single); | |
2168 | ||
2169 | static void free_npages(unsigned long id, struct ldc_iommu *iommu, | |
2170 | u64 cookie, u64 size) | |
2171 | { | |
2172 | struct iommu_arena *arena = &iommu->arena; | |
2173 | unsigned long i, shift, index, npages; | |
2174 | struct ldc_mtable_entry *base; | |
2175 | ||
2176 | npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; | |
2177 | index = cookie_to_index(cookie, &shift); | |
2178 | base = iommu->page_table + index; | |
2179 | ||
2180 | BUG_ON(index > arena->limit || | |
2181 | (index + npages) > arena->limit); | |
2182 | ||
2183 | for (i = 0; i < npages; i++) { | |
2184 | if (base->cookie) | |
2185 | sun4v_ldc_revoke(id, cookie + (i << shift), | |
2186 | base->cookie); | |
2187 | base->mte = 0; | |
2188 | __clear_bit(index + i, arena->map); | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, | |
2193 | int ncookies) | |
2194 | { | |
2195 | struct ldc_iommu *iommu = &lp->iommu; | |
2196 | unsigned long flags; | |
2197 | int i; | |
2198 | ||
2199 | spin_lock_irqsave(&iommu->lock, flags); | |
2200 | for (i = 0; i < ncookies; i++) { | |
2201 | u64 addr = cookies[i].cookie_addr; | |
2202 | u64 size = cookies[i].cookie_size; | |
2203 | ||
2204 | free_npages(lp->id, iommu, addr, size); | |
2205 | } | |
2206 | spin_unlock_irqrestore(&iommu->lock, flags); | |
2207 | } | |
2208 | EXPORT_SYMBOL(ldc_unmap); | |
2209 | ||
2210 | int ldc_copy(struct ldc_channel *lp, int copy_dir, | |
2211 | void *buf, unsigned int len, unsigned long offset, | |
2212 | struct ldc_trans_cookie *cookies, int ncookies) | |
2213 | { | |
2214 | unsigned int orig_len; | |
2215 | unsigned long ra; | |
2216 | int i; | |
2217 | ||
2218 | if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { | |
2219 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n", | |
2220 | lp->id, copy_dir); | |
2221 | return -EINVAL; | |
2222 | } | |
2223 | ||
2224 | ra = __pa(buf); | |
2225 | if ((ra | len | offset) & (8UL - 1)) { | |
2226 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " | |
2227 | "ra[%lx] len[%x] offset[%lx]\n", | |
2228 | lp->id, ra, len, offset); | |
2229 | return -EFAULT; | |
2230 | } | |
2231 | ||
2232 | if (lp->hs_state != LDC_HS_COMPLETE || | |
2233 | (lp->flags & LDC_FLAG_RESET)) { | |
2234 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " | |
2235 | "flags[%x]\n", lp->id, lp->hs_state, lp->flags); | |
2236 | return -ECONNRESET; | |
2237 | } | |
2238 | ||
2239 | orig_len = len; | |
2240 | for (i = 0; i < ncookies; i++) { | |
2241 | unsigned long cookie_raddr = cookies[i].cookie_addr; | |
2242 | unsigned long this_len = cookies[i].cookie_size; | |
2243 | unsigned long actual_len; | |
2244 | ||
2245 | if (unlikely(offset)) { | |
2246 | unsigned long this_off = offset; | |
2247 | ||
2248 | if (this_off > this_len) | |
2249 | this_off = this_len; | |
2250 | ||
2251 | offset -= this_off; | |
2252 | this_len -= this_off; | |
2253 | if (!this_len) | |
2254 | continue; | |
2255 | cookie_raddr += this_off; | |
2256 | } | |
2257 | ||
2258 | if (this_len > len) | |
2259 | this_len = len; | |
2260 | ||
2261 | while (1) { | |
2262 | unsigned long hv_err; | |
2263 | ||
2264 | hv_err = sun4v_ldc_copy(lp->id, copy_dir, | |
2265 | cookie_raddr, ra, | |
2266 | this_len, &actual_len); | |
2267 | if (unlikely(hv_err)) { | |
2268 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] " | |
2269 | "HV error %lu\n", | |
2270 | lp->id, hv_err); | |
2271 | if (lp->hs_state != LDC_HS_COMPLETE || | |
2272 | (lp->flags & LDC_FLAG_RESET)) | |
2273 | return -ECONNRESET; | |
2274 | else | |
2275 | return -EFAULT; | |
2276 | } | |
2277 | ||
2278 | cookie_raddr += actual_len; | |
2279 | ra += actual_len; | |
2280 | len -= actual_len; | |
2281 | if (actual_len == this_len) | |
2282 | break; | |
2283 | ||
2284 | this_len -= actual_len; | |
2285 | } | |
2286 | ||
2287 | if (!len) | |
2288 | break; | |
2289 | } | |
2290 | ||
2291 | /* It is caller policy what to do about short copies. | |
2292 | * For example, a networking driver can declare the | |
2293 | * packet a runt and drop it. | |
2294 | */ | |
2295 | ||
2296 | return orig_len - len; | |
2297 | } | |
2298 | EXPORT_SYMBOL(ldc_copy); | |
2299 | ||
2300 | void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, | |
2301 | struct ldc_trans_cookie *cookies, int *ncookies, | |
2302 | unsigned int map_perm) | |
2303 | { | |
2304 | void *buf; | |
2305 | int err; | |
2306 | ||
2307 | if (len & (8UL - 1)) | |
2308 | return ERR_PTR(-EINVAL); | |
2309 | ||
2310 | buf = kzalloc(len, GFP_KERNEL); | |
2311 | if (!buf) | |
2312 | return ERR_PTR(-ENOMEM); | |
2313 | ||
2314 | err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); | |
2315 | if (err < 0) { | |
2316 | kfree(buf); | |
2317 | return ERR_PTR(err); | |
2318 | } | |
2319 | *ncookies = err; | |
2320 | ||
2321 | return buf; | |
2322 | } | |
2323 | EXPORT_SYMBOL(ldc_alloc_exp_dring); | |
2324 | ||
2325 | void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, | |
2326 | struct ldc_trans_cookie *cookies, int ncookies) | |
2327 | { | |
2328 | ldc_unmap(lp, cookies, ncookies); | |
2329 | kfree(buf); | |
2330 | } | |
2331 | EXPORT_SYMBOL(ldc_free_exp_dring); | |
2332 | ||
2333 | static int __init ldc_init(void) | |
2334 | { | |
e53e97ce | 2335 | unsigned long major, minor; |
43fdf274 | 2336 | struct mdesc_handle *hp; |
e53e97ce | 2337 | const u64 *v; |
6fab2600 | 2338 | int err; |
43fdf274 | 2339 | u64 mp; |
e53e97ce | 2340 | |
43fdf274 DM |
2341 | hp = mdesc_grab(); |
2342 | if (!hp) | |
e53e97ce DM |
2343 | return -ENODEV; |
2344 | ||
43fdf274 | 2345 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); |
6fab2600 | 2346 | err = -ENODEV; |
43fdf274 | 2347 | if (mp == MDESC_NODE_NULL) |
6fab2600 | 2348 | goto out; |
43fdf274 DM |
2349 | |
2350 | v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); | |
e53e97ce | 2351 | if (!v) |
6fab2600 | 2352 | goto out; |
e53e97ce DM |
2353 | |
2354 | major = 1; | |
2355 | minor = 0; | |
2356 | if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { | |
2357 | printk(KERN_INFO PFX "Could not register LDOM hvapi.\n"); | |
6fab2600 | 2358 | goto out; |
e53e97ce DM |
2359 | } |
2360 | ||
2361 | printk(KERN_INFO "%s", version); | |
2362 | ||
2363 | if (!*v) { | |
2364 | printk(KERN_INFO PFX "Domaining disabled.\n"); | |
6fab2600 | 2365 | goto out; |
e53e97ce DM |
2366 | } |
2367 | ldom_domaining_enabled = 1; | |
6fab2600 | 2368 | err = 0; |
e53e97ce | 2369 | |
6fab2600 DM |
2370 | out: |
2371 | mdesc_release(hp); | |
2372 | return err; | |
e53e97ce DM |
2373 | } |
2374 | ||
2375 | core_initcall(ldc_init); |