1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* ldc.c: Logical Domain Channel link-layer protocol driver. |
3 | * |
4 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
5 | */ |
6 | |
7 | #include <linux/kernel.h> |
8 | #include <linux/export.h> |
9 | #include <linux/slab.h> |
10 | #include <linux/spinlock.h> |
11 | #include <linux/delay.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/string.h> |
14 | #include <linux/scatterlist.h> |
15 | #include <linux/interrupt.h> |
16 | #include <linux/list.h> |
17 | #include <linux/init.h> |
18 | #include <linux/bitmap.h> |
19 | #include <asm/iommu-common.h> |
20 | |
21 | #include <asm/hypervisor.h> |
22 | #include <asm/iommu.h> |
23 | #include <asm/page.h> |
24 | #include <asm/ldc.h> |
25 | #include <asm/mdesc.h> |
26 | |
27 | #define DRV_MODULE_NAME "ldc" |
28 | #define PFX DRV_MODULE_NAME ": " |
29 | #define DRV_MODULE_VERSION "1.1" |
30 | #define DRV_MODULE_RELDATE "July 22, 2008" |
31 | |
32 | #define COOKIE_PGSZ_CODE 0xf000000000000000ULL |
33 | #define COOKIE_PGSZ_CODE_SHIFT 60ULL |
34 | |
35 | |
36 | static char version[] = |
37 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n" ; |
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 { |
106 | /* Protects ldc_unmap. */ |
107 | spinlock_t lock; |
108 | struct ldc_mtable_entry *page_table; |
109 | struct iommu_map_table iommu_map_table; |
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 | |
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 | |
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 | #define LDC_ABORT(lp) ldc_abort((lp), __func__) |
182 | |
183 | static const char *state_to_str(u8 state) |
184 | { |
185 | switch (state) { |
186 | case LDC_STATE_INVALID: |
187 | return "INVALID" ; |
188 | case LDC_STATE_INIT: |
189 | return "INIT" ; |
190 | case LDC_STATE_BOUND: |
191 | return "BOUND" ; |
192 | case LDC_STATE_READY: |
193 | return "READY" ; |
194 | case LDC_STATE_CONNECTED: |
195 | return "CONNECTED" ; |
196 | default: |
197 | return "<UNKNOWN>" ; |
198 | } |
199 | } |
200 | |
201 | static unsigned long __advance(unsigned long off, unsigned long num_entries) |
202 | { |
203 | off += LDC_PACKET_SIZE; |
204 | if (off == (num_entries * LDC_PACKET_SIZE)) |
205 | off = 0; |
206 | |
207 | return off; |
208 | } |
209 | |
210 | static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off) |
211 | { |
212 | return __advance(off, num_entries: lp->rx_num_entries); |
213 | } |
214 | |
215 | static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off) |
216 | { |
217 | return __advance(off, num_entries: lp->tx_num_entries); |
218 | } |
219 | |
220 | static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp, |
221 | unsigned long *new_tail) |
222 | { |
223 | struct ldc_packet *p; |
224 | unsigned long t; |
225 | |
226 | t = tx_advance(lp, off: lp->tx_tail); |
227 | if (t == lp->tx_head) |
228 | return NULL; |
229 | |
230 | *new_tail = t; |
231 | |
232 | p = lp->tx_base; |
233 | return p + (lp->tx_tail / LDC_PACKET_SIZE); |
234 | } |
235 | |
236 | /* When we are in reliable or stream mode, have to track the next packet |
237 | * we haven't gotten an ACK for in the TX queue using tx_acked. We have |
238 | * to be careful not to stomp over the queue past that point. During |
239 | * the handshake, we don't have TX data packets pending in the queue |
240 | * and that's why handshake_get_tx_packet() need not be mindful of |
241 | * lp->tx_acked. |
242 | */ |
243 | static unsigned long head_for_data(struct ldc_channel *lp) |
244 | { |
245 | if (lp->cfg.mode == LDC_MODE_STREAM) |
246 | return lp->tx_acked; |
247 | return lp->tx_head; |
248 | } |
249 | |
250 | static int tx_has_space_for(struct ldc_channel *lp, unsigned int size) |
251 | { |
252 | unsigned long limit, tail, new_tail, diff; |
253 | unsigned int mss; |
254 | |
255 | limit = head_for_data(lp); |
256 | tail = lp->tx_tail; |
257 | new_tail = tx_advance(lp, off: tail); |
258 | if (new_tail == limit) |
259 | return 0; |
260 | |
261 | if (limit > new_tail) |
262 | diff = limit - new_tail; |
263 | else |
264 | diff = (limit + |
265 | ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail)); |
266 | diff /= LDC_PACKET_SIZE; |
267 | mss = lp->mss; |
268 | |
269 | if (diff * mss < size) |
270 | return 0; |
271 | |
272 | return 1; |
273 | } |
274 | |
275 | static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp, |
276 | unsigned long *new_tail) |
277 | { |
278 | struct ldc_packet *p; |
279 | unsigned long h, t; |
280 | |
281 | h = head_for_data(lp); |
282 | t = tx_advance(lp, off: lp->tx_tail); |
283 | if (t == h) |
284 | return NULL; |
285 | |
286 | *new_tail = t; |
287 | |
288 | p = lp->tx_base; |
289 | return p + (lp->tx_tail / LDC_PACKET_SIZE); |
290 | } |
291 | |
292 | static int set_tx_tail(struct ldc_channel *lp, unsigned long tail) |
293 | { |
294 | unsigned long orig_tail = lp->tx_tail; |
295 | int limit = 1000; |
296 | |
297 | lp->tx_tail = tail; |
298 | while (limit-- > 0) { |
299 | unsigned long err; |
300 | |
301 | err = sun4v_ldc_tx_set_qtail(lp->id, tail); |
302 | if (!err) |
303 | return 0; |
304 | |
305 | if (err != HV_EWOULDBLOCK) { |
306 | lp->tx_tail = orig_tail; |
307 | return -EINVAL; |
308 | } |
309 | udelay(1); |
310 | } |
311 | |
312 | lp->tx_tail = orig_tail; |
313 | return -EBUSY; |
314 | } |
315 | |
316 | /* This just updates the head value in the hypervisor using |
317 | * a polling loop with a timeout. The caller takes care of |
318 | * upating software state representing the head change, if any. |
319 | */ |
320 | static int __set_rx_head(struct ldc_channel *lp, unsigned long head) |
321 | { |
322 | int limit = 1000; |
323 | |
324 | while (limit-- > 0) { |
325 | unsigned long err; |
326 | |
327 | err = sun4v_ldc_rx_set_qhead(lp->id, head); |
328 | if (!err) |
329 | return 0; |
330 | |
331 | if (err != HV_EWOULDBLOCK) |
332 | return -EINVAL; |
333 | |
334 | udelay(1); |
335 | } |
336 | |
337 | return -EBUSY; |
338 | } |
339 | |
340 | static int send_tx_packet(struct ldc_channel *lp, |
341 | struct ldc_packet *p, |
342 | unsigned long new_tail) |
343 | { |
344 | BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE))); |
345 | |
346 | return set_tx_tail(lp, tail: new_tail); |
347 | } |
348 | |
349 | static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp, |
350 | u8 stype, u8 ctrl, |
351 | void *data, int dlen, |
352 | unsigned long *new_tail) |
353 | { |
354 | struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail); |
355 | |
356 | if (p) { |
357 | memset(p, 0, sizeof(*p)); |
358 | p->type = LDC_CTRL; |
359 | p->stype = stype; |
360 | p->ctrl = ctrl; |
361 | if (data) |
362 | memcpy(p->u.u_data, data, dlen); |
363 | } |
364 | return p; |
365 | } |
366 | |
367 | static int start_handshake(struct ldc_channel *lp) |
368 | { |
369 | struct ldc_packet *p; |
370 | struct ldc_version *ver; |
371 | unsigned long new_tail; |
372 | |
373 | ver = &ver_arr[0]; |
374 | |
375 | ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n" , |
376 | ver->major, ver->minor); |
377 | |
378 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
379 | data: ver, dlen: sizeof(*ver), new_tail: &new_tail); |
380 | if (p) { |
381 | int err = send_tx_packet(lp, p, new_tail); |
382 | if (!err) |
383 | lp->flags &= ~LDC_FLAG_RESET; |
384 | return err; |
385 | } |
386 | return -EBUSY; |
387 | } |
388 | |
389 | static int send_version_nack(struct ldc_channel *lp, |
390 | u16 major, u16 minor) |
391 | { |
392 | struct ldc_packet *p; |
393 | struct ldc_version ver; |
394 | unsigned long new_tail; |
395 | |
396 | ver.major = major; |
397 | ver.minor = minor; |
398 | |
399 | p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS, |
400 | data: &ver, dlen: sizeof(ver), new_tail: &new_tail); |
401 | if (p) { |
402 | ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n" , |
403 | ver.major, ver.minor); |
404 | |
405 | return send_tx_packet(lp, p, new_tail); |
406 | } |
407 | return -EBUSY; |
408 | } |
409 | |
410 | static int send_version_ack(struct ldc_channel *lp, |
411 | struct ldc_version *vp) |
412 | { |
413 | struct ldc_packet *p; |
414 | unsigned long new_tail; |
415 | |
416 | p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS, |
417 | data: vp, dlen: sizeof(*vp), new_tail: &new_tail); |
418 | if (p) { |
419 | ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n" , |
420 | vp->major, vp->minor); |
421 | |
422 | return send_tx_packet(lp, p, new_tail); |
423 | } |
424 | return -EBUSY; |
425 | } |
426 | |
427 | static int send_rts(struct ldc_channel *lp) |
428 | { |
429 | struct ldc_packet *p; |
430 | unsigned long new_tail; |
431 | |
432 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, dlen: 0, |
433 | new_tail: &new_tail); |
434 | if (p) { |
435 | p->env = lp->cfg.mode; |
436 | p->seqid = 0; |
437 | lp->rcv_nxt = 0; |
438 | |
439 | ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n" , |
440 | p->env, p->seqid); |
441 | |
442 | return send_tx_packet(lp, p, new_tail); |
443 | } |
444 | return -EBUSY; |
445 | } |
446 | |
447 | static int send_rtr(struct ldc_channel *lp) |
448 | { |
449 | struct ldc_packet *p; |
450 | unsigned long new_tail; |
451 | |
452 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, dlen: 0, |
453 | new_tail: &new_tail); |
454 | if (p) { |
455 | p->env = lp->cfg.mode; |
456 | p->seqid = 0; |
457 | |
458 | ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n" , |
459 | p->env, p->seqid); |
460 | |
461 | return send_tx_packet(lp, p, new_tail); |
462 | } |
463 | return -EBUSY; |
464 | } |
465 | |
466 | static int send_rdx(struct ldc_channel *lp) |
467 | { |
468 | struct ldc_packet *p; |
469 | unsigned long new_tail; |
470 | |
471 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, dlen: 0, |
472 | new_tail: &new_tail); |
473 | if (p) { |
474 | p->env = 0; |
475 | p->seqid = ++lp->snd_nxt; |
476 | p->u.r.ackid = lp->rcv_nxt; |
477 | |
478 | ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n" , |
479 | p->env, p->seqid, p->u.r.ackid); |
480 | |
481 | return send_tx_packet(lp, p, new_tail); |
482 | } |
483 | return -EBUSY; |
484 | } |
485 | |
486 | static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt) |
487 | { |
488 | struct ldc_packet *p; |
489 | unsigned long new_tail; |
490 | int err; |
491 | |
492 | p = data_get_tx_packet(lp, new_tail: &new_tail); |
493 | if (!p) |
494 | return -EBUSY; |
495 | memset(p, 0, sizeof(*p)); |
496 | p->type = data_pkt->type; |
497 | p->stype = LDC_NACK; |
498 | p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK; |
499 | p->seqid = lp->snd_nxt + 1; |
500 | p->u.r.ackid = lp->rcv_nxt; |
501 | |
502 | ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n" , |
503 | p->type, p->ctrl, p->seqid, p->u.r.ackid); |
504 | |
505 | err = send_tx_packet(lp, p, new_tail); |
506 | if (!err) |
507 | lp->snd_nxt++; |
508 | |
509 | return err; |
510 | } |
511 | |
512 | static int ldc_abort(struct ldc_channel *lp, const char *msg) |
513 | { |
514 | unsigned long hv_err; |
515 | |
516 | ldcdbg(STATE, "ABORT[%s]\n" , msg); |
517 | ldc_print(lp); |
518 | |
519 | /* We report but do not act upon the hypervisor errors because |
520 | * there really isn't much we can do if they fail at this point. |
521 | */ |
522 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
523 | if (hv_err) |
524 | printk(KERN_ERR PFX "ldc_abort: " |
525 | "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n" , |
526 | lp->id, lp->tx_ra, lp->tx_num_entries, hv_err); |
527 | |
528 | hv_err = sun4v_ldc_tx_get_state(lp->id, |
529 | &lp->tx_head, |
530 | &lp->tx_tail, |
531 | &lp->chan_state); |
532 | if (hv_err) |
533 | printk(KERN_ERR PFX "ldc_abort: " |
534 | "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n" , |
535 | lp->id, hv_err); |
536 | |
537 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
538 | if (hv_err) |
539 | printk(KERN_ERR PFX "ldc_abort: " |
540 | "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n" , |
541 | lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); |
542 | |
543 | /* Refetch the RX queue state as well, because we could be invoked |
544 | * here in the queue processing context. |
545 | */ |
546 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
547 | &lp->rx_head, |
548 | &lp->rx_tail, |
549 | &lp->chan_state); |
550 | if (hv_err) |
551 | printk(KERN_ERR PFX "ldc_abort: " |
552 | "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n" , |
553 | lp->id, hv_err); |
554 | |
555 | return -ECONNRESET; |
556 | } |
557 | |
558 | static struct ldc_version *find_by_major(u16 major) |
559 | { |
560 | struct ldc_version *ret = NULL; |
561 | int i; |
562 | |
563 | for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { |
564 | struct ldc_version *v = &ver_arr[i]; |
565 | if (v->major <= major) { |
566 | ret = v; |
567 | break; |
568 | } |
569 | } |
570 | return ret; |
571 | } |
572 | |
573 | static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) |
574 | { |
575 | struct ldc_version *vap; |
576 | int err; |
577 | |
578 | ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n" , |
579 | vp->major, vp->minor); |
580 | |
581 | if (lp->hs_state == LDC_HS_GOTVERS) { |
582 | lp->hs_state = LDC_HS_OPEN; |
583 | memset(&lp->ver, 0, sizeof(lp->ver)); |
584 | } |
585 | |
586 | vap = find_by_major(major: vp->major); |
587 | if (!vap) { |
588 | err = send_version_nack(lp, major: 0, minor: 0); |
589 | } else if (vap->major != vp->major) { |
590 | err = send_version_nack(lp, major: vap->major, minor: vap->minor); |
591 | } else { |
592 | struct ldc_version ver = *vp; |
593 | if (ver.minor > vap->minor) |
594 | ver.minor = vap->minor; |
595 | err = send_version_ack(lp, vp: &ver); |
596 | if (!err) { |
597 | lp->ver = ver; |
598 | lp->hs_state = LDC_HS_GOTVERS; |
599 | } |
600 | } |
601 | if (err) |
602 | return LDC_ABORT(lp); |
603 | |
604 | return 0; |
605 | } |
606 | |
607 | static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp) |
608 | { |
609 | ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n" , |
610 | vp->major, vp->minor); |
611 | |
612 | if (lp->hs_state == LDC_HS_GOTVERS) { |
613 | if (lp->ver.major != vp->major || |
614 | lp->ver.minor != vp->minor) |
615 | return LDC_ABORT(lp); |
616 | } else { |
617 | lp->ver = *vp; |
618 | lp->hs_state = LDC_HS_GOTVERS; |
619 | } |
620 | if (send_rts(lp)) |
621 | return LDC_ABORT(lp); |
622 | return 0; |
623 | } |
624 | |
625 | static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp) |
626 | { |
627 | struct ldc_version *vap; |
628 | struct ldc_packet *p; |
629 | unsigned long new_tail; |
630 | |
631 | if (vp->major == 0 && vp->minor == 0) |
632 | return LDC_ABORT(lp); |
633 | |
634 | vap = find_by_major(major: vp->major); |
635 | if (!vap) |
636 | return LDC_ABORT(lp); |
637 | |
638 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
639 | data: vap, dlen: sizeof(*vap), |
640 | new_tail: &new_tail); |
641 | if (!p) |
642 | return LDC_ABORT(lp); |
643 | |
644 | return send_tx_packet(lp, p, new_tail); |
645 | } |
646 | |
647 | static int process_version(struct ldc_channel *lp, |
648 | struct ldc_packet *p) |
649 | { |
650 | struct ldc_version *vp; |
651 | |
652 | vp = (struct ldc_version *) p->u.u_data; |
653 | |
654 | switch (p->stype) { |
655 | case LDC_INFO: |
656 | return process_ver_info(lp, vp); |
657 | |
658 | case LDC_ACK: |
659 | return process_ver_ack(lp, vp); |
660 | |
661 | case LDC_NACK: |
662 | return process_ver_nack(lp, vp); |
663 | |
664 | default: |
665 | return LDC_ABORT(lp); |
666 | } |
667 | } |
668 | |
669 | static int process_rts(struct ldc_channel *lp, |
670 | struct ldc_packet *p) |
671 | { |
672 | ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n" , |
673 | p->stype, p->seqid, p->env); |
674 | |
675 | if (p->stype != LDC_INFO || |
676 | lp->hs_state != LDC_HS_GOTVERS || |
677 | p->env != lp->cfg.mode) |
678 | return LDC_ABORT(lp); |
679 | |
680 | lp->snd_nxt = p->seqid; |
681 | lp->rcv_nxt = p->seqid; |
682 | lp->hs_state = LDC_HS_SENTRTR; |
683 | if (send_rtr(lp)) |
684 | return LDC_ABORT(lp); |
685 | |
686 | return 0; |
687 | } |
688 | |
689 | static int process_rtr(struct ldc_channel *lp, |
690 | struct ldc_packet *p) |
691 | { |
692 | ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n" , |
693 | p->stype, p->seqid, p->env); |
694 | |
695 | if (p->stype != LDC_INFO || |
696 | p->env != lp->cfg.mode) |
697 | return LDC_ABORT(lp); |
698 | |
699 | lp->snd_nxt = p->seqid; |
700 | lp->hs_state = LDC_HS_COMPLETE; |
701 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
702 | send_rdx(lp); |
703 | |
704 | return LDC_EVENT_UP; |
705 | } |
706 | |
707 | static int rx_seq_ok(struct ldc_channel *lp, u32 seqid) |
708 | { |
709 | return lp->rcv_nxt + 1 == seqid; |
710 | } |
711 | |
712 | static int process_rdx(struct ldc_channel *lp, |
713 | struct ldc_packet *p) |
714 | { |
715 | ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n" , |
716 | p->stype, p->seqid, p->env, p->u.r.ackid); |
717 | |
718 | if (p->stype != LDC_INFO || |
719 | !(rx_seq_ok(lp, seqid: p->seqid))) |
720 | return LDC_ABORT(lp); |
721 | |
722 | lp->rcv_nxt = p->seqid; |
723 | |
724 | lp->hs_state = LDC_HS_COMPLETE; |
725 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
726 | |
727 | return LDC_EVENT_UP; |
728 | } |
729 | |
730 | static int process_control_frame(struct ldc_channel *lp, |
731 | struct ldc_packet *p) |
732 | { |
733 | switch (p->ctrl) { |
734 | case LDC_VERS: |
735 | return process_version(lp, p); |
736 | |
737 | case LDC_RTS: |
738 | return process_rts(lp, p); |
739 | |
740 | case LDC_RTR: |
741 | return process_rtr(lp, p); |
742 | |
743 | case LDC_RDX: |
744 | return process_rdx(lp, p); |
745 | |
746 | default: |
747 | return LDC_ABORT(lp); |
748 | } |
749 | } |
750 | |
751 | static int process_error_frame(struct ldc_channel *lp, |
752 | struct ldc_packet *p) |
753 | { |
754 | return LDC_ABORT(lp); |
755 | } |
756 | |
757 | static int process_data_ack(struct ldc_channel *lp, |
758 | struct ldc_packet *ack) |
759 | { |
760 | unsigned long head = lp->tx_acked; |
761 | u32 ackid = ack->u.r.ackid; |
762 | |
763 | while (1) { |
764 | struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE); |
765 | |
766 | head = tx_advance(lp, off: head); |
767 | |
768 | if (p->seqid == ackid) { |
769 | lp->tx_acked = head; |
770 | return 0; |
771 | } |
772 | if (head == lp->tx_tail) |
773 | return LDC_ABORT(lp); |
774 | } |
775 | |
776 | return 0; |
777 | } |
778 | |
779 | static void send_events(struct ldc_channel *lp, unsigned int event_mask) |
780 | { |
781 | if (event_mask & LDC_EVENT_RESET) |
782 | lp->cfg.event(lp->event_arg, LDC_EVENT_RESET); |
783 | if (event_mask & LDC_EVENT_UP) |
784 | lp->cfg.event(lp->event_arg, LDC_EVENT_UP); |
785 | if (event_mask & LDC_EVENT_DATA_READY) |
786 | lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY); |
787 | } |
788 | |
789 | static irqreturn_t ldc_rx(int irq, void *dev_id) |
790 | { |
791 | struct ldc_channel *lp = dev_id; |
792 | unsigned long orig_state, flags; |
793 | unsigned int event_mask; |
794 | |
795 | spin_lock_irqsave(&lp->lock, flags); |
796 | |
797 | orig_state = lp->chan_state; |
798 | |
799 | /* We should probably check for hypervisor errors here and |
800 | * reset the LDC channel if we get one. |
801 | */ |
802 | sun4v_ldc_rx_get_state(lp->id, |
803 | &lp->rx_head, |
804 | &lp->rx_tail, |
805 | &lp->chan_state); |
806 | |
807 | ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n" , |
808 | orig_state, lp->chan_state, lp->rx_head, lp->rx_tail); |
809 | |
810 | event_mask = 0; |
811 | |
812 | if (lp->cfg.mode == LDC_MODE_RAW && |
813 | lp->chan_state == LDC_CHANNEL_UP) { |
814 | lp->hs_state = LDC_HS_COMPLETE; |
815 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
816 | |
817 | /* |
818 | * Generate an LDC_EVENT_UP event if the channel |
819 | * was not already up. |
820 | */ |
821 | if (orig_state != LDC_CHANNEL_UP) { |
822 | event_mask |= LDC_EVENT_UP; |
823 | orig_state = lp->chan_state; |
824 | } |
825 | } |
826 | |
827 | /* If we are in reset state, flush the RX queue and ignore |
828 | * everything. |
829 | */ |
830 | if (lp->flags & LDC_FLAG_RESET) { |
831 | (void) ldc_rx_reset(lp); |
832 | goto out; |
833 | } |
834 | |
835 | /* Once we finish the handshake, we let the ldc_read() |
836 | * paths do all of the control frame and state management. |
837 | * Just trigger the callback. |
838 | */ |
839 | if (lp->hs_state == LDC_HS_COMPLETE) { |
840 | handshake_complete: |
841 | if (lp->chan_state != orig_state) { |
842 | unsigned int event = LDC_EVENT_RESET; |
843 | |
844 | if (lp->chan_state == LDC_CHANNEL_UP) |
845 | event = LDC_EVENT_UP; |
846 | |
847 | event_mask |= event; |
848 | } |
849 | if (lp->rx_head != lp->rx_tail) |
850 | event_mask |= LDC_EVENT_DATA_READY; |
851 | |
852 | goto out; |
853 | } |
854 | |
855 | if (lp->chan_state != orig_state) |
856 | goto out; |
857 | |
858 | while (lp->rx_head != lp->rx_tail) { |
859 | struct ldc_packet *p; |
860 | unsigned long new; |
861 | int err; |
862 | |
863 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); |
864 | |
865 | switch (p->type) { |
866 | case LDC_CTRL: |
867 | err = process_control_frame(lp, p); |
868 | if (err > 0) |
869 | event_mask |= err; |
870 | break; |
871 | |
872 | case LDC_DATA: |
873 | event_mask |= LDC_EVENT_DATA_READY; |
874 | err = 0; |
875 | break; |
876 | |
877 | case LDC_ERR: |
878 | err = process_error_frame(lp, p); |
879 | break; |
880 | |
881 | default: |
882 | err = LDC_ABORT(lp); |
883 | break; |
884 | } |
885 | |
886 | if (err < 0) |
887 | break; |
888 | |
889 | new = lp->rx_head; |
890 | new += LDC_PACKET_SIZE; |
891 | if (new == (lp->rx_num_entries * LDC_PACKET_SIZE)) |
892 | new = 0; |
893 | lp->rx_head = new; |
894 | |
895 | err = __set_rx_head(lp, head: new); |
896 | if (err < 0) { |
897 | (void) LDC_ABORT(lp); |
898 | break; |
899 | } |
900 | if (lp->hs_state == LDC_HS_COMPLETE) |
901 | goto handshake_complete; |
902 | } |
903 | |
904 | out: |
905 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
906 | |
907 | send_events(lp, event_mask); |
908 | |
909 | return IRQ_HANDLED; |
910 | } |
911 | |
912 | static irqreturn_t ldc_tx(int irq, void *dev_id) |
913 | { |
914 | struct ldc_channel *lp = dev_id; |
915 | unsigned long flags, orig_state; |
916 | unsigned int event_mask = 0; |
917 | |
918 | spin_lock_irqsave(&lp->lock, flags); |
919 | |
920 | orig_state = lp->chan_state; |
921 | |
922 | /* We should probably check for hypervisor errors here and |
923 | * reset the LDC channel if we get one. |
924 | */ |
925 | sun4v_ldc_tx_get_state(lp->id, |
926 | &lp->tx_head, |
927 | &lp->tx_tail, |
928 | &lp->chan_state); |
929 | |
930 | ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n" , |
931 | orig_state, lp->chan_state, lp->tx_head, lp->tx_tail); |
932 | |
933 | if (lp->cfg.mode == LDC_MODE_RAW && |
934 | lp->chan_state == LDC_CHANNEL_UP) { |
935 | lp->hs_state = LDC_HS_COMPLETE; |
936 | ldc_set_state(lp, LDC_STATE_CONNECTED); |
937 | |
938 | /* |
939 | * Generate an LDC_EVENT_UP event if the channel |
940 | * was not already up. |
941 | */ |
942 | if (orig_state != LDC_CHANNEL_UP) { |
943 | event_mask |= LDC_EVENT_UP; |
944 | orig_state = lp->chan_state; |
945 | } |
946 | } |
947 | |
948 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
949 | |
950 | send_events(lp, event_mask); |
951 | |
952 | return IRQ_HANDLED; |
953 | } |
954 | |
955 | /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so |
956 | * XXX that addition and removal from the ldc_channel_list has |
957 | * XXX atomicity, otherwise the __ldc_channel_exists() check is |
958 | * XXX totally pointless as another thread can slip into ldc_alloc() |
959 | * XXX and add a channel with the same ID. There also needs to be |
960 | * XXX a spinlock for ldc_channel_list. |
961 | */ |
962 | static HLIST_HEAD(ldc_channel_list); |
963 | |
964 | static int __ldc_channel_exists(unsigned long id) |
965 | { |
966 | struct ldc_channel *lp; |
967 | |
968 | hlist_for_each_entry(lp, &ldc_channel_list, list) { |
969 | if (lp->id == id) |
970 | return 1; |
971 | } |
972 | return 0; |
973 | } |
974 | |
975 | static int alloc_queue(const char *name, unsigned long num_entries, |
976 | struct ldc_packet **base, unsigned long *ra) |
977 | { |
978 | unsigned long size, order; |
979 | void *q; |
980 | |
981 | size = num_entries * LDC_PACKET_SIZE; |
982 | order = get_order(size); |
983 | |
984 | q = (void *) __get_free_pages(GFP_KERNEL, order); |
985 | if (!q) { |
986 | printk(KERN_ERR PFX "Alloc of %s queue failed with " |
987 | "size=%lu order=%lu\n" , name, size, order); |
988 | return -ENOMEM; |
989 | } |
990 | |
991 | memset(q, 0, PAGE_SIZE << order); |
992 | |
993 | *base = q; |
994 | *ra = __pa(q); |
995 | |
996 | return 0; |
997 | } |
998 | |
999 | static void free_queue(unsigned long num_entries, struct ldc_packet *q) |
1000 | { |
1001 | unsigned long size, order; |
1002 | |
1003 | if (!q) |
1004 | return; |
1005 | |
1006 | size = num_entries * LDC_PACKET_SIZE; |
1007 | order = get_order(size); |
1008 | |
1009 | free_pages(addr: (unsigned long)q, order); |
1010 | } |
1011 | |
1012 | static unsigned long ldc_cookie_to_index(u64 cookie, void *arg) |
1013 | { |
1014 | u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT; |
1015 | /* struct ldc_iommu *ldc_iommu = (struct ldc_iommu *)arg; */ |
1016 | |
1017 | cookie &= ~COOKIE_PGSZ_CODE; |
1018 | |
1019 | return (cookie >> (13ULL + (szcode * 3ULL))); |
1020 | } |
1021 | |
1022 | static void ldc_demap(struct ldc_iommu *iommu, unsigned long id, u64 cookie, |
1023 | unsigned long entry, unsigned long npages) |
1024 | { |
1025 | struct ldc_mtable_entry *base; |
1026 | unsigned long i, shift; |
1027 | |
1028 | shift = (cookie >> COOKIE_PGSZ_CODE_SHIFT) * 3; |
1029 | base = iommu->page_table + entry; |
1030 | for (i = 0; i < npages; i++) { |
1031 | if (base->cookie) |
1032 | sun4v_ldc_revoke(id, cookie + (i << shift), |
1033 | base->cookie); |
1034 | base->mte = 0; |
1035 | } |
1036 | } |
1037 | |
1038 | /* XXX Make this configurable... XXX */ |
1039 | #define LDC_IOTABLE_SIZE (8 * 1024) |
1040 | |
1041 | static int ldc_iommu_init(const char *name, struct ldc_channel *lp) |
1042 | { |
1043 | unsigned long sz, num_tsb_entries, tsbsize, order; |
1044 | struct ldc_iommu *ldc_iommu = &lp->iommu; |
1045 | struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; |
1046 | struct ldc_mtable_entry *table; |
1047 | unsigned long hv_err; |
1048 | int err; |
1049 | |
1050 | num_tsb_entries = LDC_IOTABLE_SIZE; |
1051 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
1052 | spin_lock_init(&ldc_iommu->lock); |
1053 | |
1054 | sz = num_tsb_entries / 8; |
1055 | sz = (sz + 7UL) & ~7UL; |
1056 | iommu->map = kzalloc(size: sz, GFP_KERNEL); |
1057 | if (!iommu->map) { |
1058 | printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n" , sz); |
1059 | return -ENOMEM; |
1060 | } |
1061 | iommu_tbl_pool_init(iommu, num_tsb_entries, PAGE_SHIFT, |
1062 | NULL, false /* no large pool */, |
1063 | 1 /* npools */, |
1064 | true /* skip span boundary check */); |
1065 | |
1066 | order = get_order(size: tsbsize); |
1067 | |
1068 | table = (struct ldc_mtable_entry *) |
1069 | __get_free_pages(GFP_KERNEL, order); |
1070 | err = -ENOMEM; |
1071 | if (!table) { |
1072 | printk(KERN_ERR PFX "Alloc of MTE table failed, " |
1073 | "size=%lu order=%lu\n" , tsbsize, order); |
1074 | goto out_free_map; |
1075 | } |
1076 | |
1077 | memset(table, 0, PAGE_SIZE << order); |
1078 | |
1079 | ldc_iommu->page_table = table; |
1080 | |
1081 | hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table), |
1082 | num_tsb_entries); |
1083 | err = -EINVAL; |
1084 | if (hv_err) |
1085 | goto out_free_table; |
1086 | |
1087 | return 0; |
1088 | |
1089 | out_free_table: |
1090 | free_pages(addr: (unsigned long) table, order); |
1091 | ldc_iommu->page_table = NULL; |
1092 | |
1093 | out_free_map: |
1094 | kfree(objp: iommu->map); |
1095 | iommu->map = NULL; |
1096 | |
1097 | return err; |
1098 | } |
1099 | |
1100 | static void ldc_iommu_release(struct ldc_channel *lp) |
1101 | { |
1102 | struct ldc_iommu *ldc_iommu = &lp->iommu; |
1103 | struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; |
1104 | unsigned long num_tsb_entries, tsbsize, order; |
1105 | |
1106 | (void) sun4v_ldc_set_map_table(lp->id, 0, 0); |
1107 | |
1108 | num_tsb_entries = iommu->poolsize * iommu->nr_pools; |
1109 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
1110 | order = get_order(size: tsbsize); |
1111 | |
1112 | free_pages(addr: (unsigned long) ldc_iommu->page_table, order); |
1113 | ldc_iommu->page_table = NULL; |
1114 | |
1115 | kfree(objp: iommu->map); |
1116 | iommu->map = NULL; |
1117 | } |
1118 | |
1119 | struct ldc_channel *ldc_alloc(unsigned long id, |
1120 | const struct ldc_channel_config *cfgp, |
1121 | void *event_arg, |
1122 | const char *name) |
1123 | { |
1124 | struct ldc_channel *lp; |
1125 | const struct ldc_mode_ops *mops; |
1126 | unsigned long dummy1, dummy2, hv_err; |
1127 | u8 mss, *mssbuf; |
1128 | int err; |
1129 | |
1130 | err = -ENODEV; |
1131 | if (!ldom_domaining_enabled) |
1132 | goto out_err; |
1133 | |
1134 | err = -EINVAL; |
1135 | if (!cfgp) |
1136 | goto out_err; |
1137 | if (!name) |
1138 | goto out_err; |
1139 | |
1140 | switch (cfgp->mode) { |
1141 | case LDC_MODE_RAW: |
1142 | mops = &raw_ops; |
1143 | mss = LDC_PACKET_SIZE; |
1144 | break; |
1145 | |
1146 | case LDC_MODE_UNRELIABLE: |
1147 | mops = &nonraw_ops; |
1148 | mss = LDC_PACKET_SIZE - 8; |
1149 | break; |
1150 | |
1151 | case LDC_MODE_STREAM: |
1152 | mops = &stream_ops; |
1153 | mss = LDC_PACKET_SIZE - 8 - 8; |
1154 | break; |
1155 | |
1156 | default: |
1157 | goto out_err; |
1158 | } |
1159 | |
1160 | if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq) |
1161 | goto out_err; |
1162 | |
1163 | hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2); |
1164 | err = -ENODEV; |
1165 | if (hv_err == HV_ECHANNEL) |
1166 | goto out_err; |
1167 | |
1168 | err = -EEXIST; |
1169 | if (__ldc_channel_exists(id)) |
1170 | goto out_err; |
1171 | |
1172 | mssbuf = NULL; |
1173 | |
1174 | lp = kzalloc(size: sizeof(*lp), GFP_KERNEL); |
1175 | err = -ENOMEM; |
1176 | if (!lp) |
1177 | goto out_err; |
1178 | |
1179 | spin_lock_init(&lp->lock); |
1180 | |
1181 | lp->id = id; |
1182 | |
1183 | err = ldc_iommu_init(name, lp); |
1184 | if (err) |
1185 | goto out_free_ldc; |
1186 | |
1187 | lp->mops = mops; |
1188 | lp->mss = mss; |
1189 | |
1190 | lp->cfg = *cfgp; |
1191 | if (!lp->cfg.mtu) |
1192 | lp->cfg.mtu = LDC_DEFAULT_MTU; |
1193 | |
1194 | if (lp->cfg.mode == LDC_MODE_STREAM) { |
1195 | mssbuf = kzalloc(size: lp->cfg.mtu, GFP_KERNEL); |
1196 | if (!mssbuf) { |
1197 | err = -ENOMEM; |
1198 | goto out_free_iommu; |
1199 | } |
1200 | lp->mssbuf = mssbuf; |
1201 | } |
1202 | |
1203 | lp->event_arg = event_arg; |
1204 | |
1205 | /* XXX allow setting via ldc_channel_config to override defaults |
1206 | * XXX or use some formula based upon mtu |
1207 | */ |
1208 | lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES; |
1209 | lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES; |
1210 | |
1211 | err = alloc_queue(name: "TX" , num_entries: lp->tx_num_entries, |
1212 | base: &lp->tx_base, ra: &lp->tx_ra); |
1213 | if (err) |
1214 | goto out_free_mssbuf; |
1215 | |
1216 | err = alloc_queue(name: "RX" , num_entries: lp->rx_num_entries, |
1217 | base: &lp->rx_base, ra: &lp->rx_ra); |
1218 | if (err) |
1219 | goto out_free_txq; |
1220 | |
1221 | lp->flags |= LDC_FLAG_ALLOCED_QUEUES; |
1222 | |
1223 | lp->hs_state = LDC_HS_CLOSED; |
1224 | ldc_set_state(lp, LDC_STATE_INIT); |
1225 | |
1226 | INIT_HLIST_NODE(h: &lp->list); |
1227 | hlist_add_head(n: &lp->list, h: &ldc_channel_list); |
1228 | |
1229 | INIT_HLIST_HEAD(&lp->mh_list); |
1230 | |
1231 | snprintf(buf: lp->rx_irq_name, LDC_IRQ_NAME_MAX, fmt: "%s RX" , name); |
1232 | snprintf(buf: lp->tx_irq_name, LDC_IRQ_NAME_MAX, fmt: "%s TX" , name); |
1233 | |
1234 | err = request_irq(irq: lp->cfg.rx_irq, handler: ldc_rx, flags: 0, |
1235 | name: lp->rx_irq_name, dev: lp); |
1236 | if (err) |
1237 | goto out_free_txq; |
1238 | |
1239 | err = request_irq(irq: lp->cfg.tx_irq, handler: ldc_tx, flags: 0, |
1240 | name: lp->tx_irq_name, dev: lp); |
1241 | if (err) { |
1242 | free_irq(lp->cfg.rx_irq, lp); |
1243 | goto out_free_txq; |
1244 | } |
1245 | |
1246 | return lp; |
1247 | |
1248 | out_free_txq: |
1249 | free_queue(num_entries: lp->tx_num_entries, q: lp->tx_base); |
1250 | |
1251 | out_free_mssbuf: |
1252 | kfree(objp: mssbuf); |
1253 | |
1254 | out_free_iommu: |
1255 | ldc_iommu_release(lp); |
1256 | |
1257 | out_free_ldc: |
1258 | kfree(objp: lp); |
1259 | |
1260 | out_err: |
1261 | return ERR_PTR(error: err); |
1262 | } |
1263 | EXPORT_SYMBOL(ldc_alloc); |
1264 | |
1265 | void ldc_unbind(struct ldc_channel *lp) |
1266 | { |
1267 | if (lp->flags & LDC_FLAG_REGISTERED_IRQS) { |
1268 | free_irq(lp->cfg.rx_irq, lp); |
1269 | free_irq(lp->cfg.tx_irq, lp); |
1270 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
1271 | } |
1272 | |
1273 | if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) { |
1274 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
1275 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
1276 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; |
1277 | } |
1278 | if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) { |
1279 | free_queue(num_entries: lp->tx_num_entries, q: lp->tx_base); |
1280 | free_queue(num_entries: lp->rx_num_entries, q: lp->rx_base); |
1281 | lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; |
1282 | } |
1283 | |
1284 | ldc_set_state(lp, LDC_STATE_INIT); |
1285 | } |
1286 | EXPORT_SYMBOL(ldc_unbind); |
1287 | |
1288 | void ldc_free(struct ldc_channel *lp) |
1289 | { |
1290 | ldc_unbind(lp); |
1291 | hlist_del(n: &lp->list); |
1292 | kfree(objp: lp->mssbuf); |
1293 | ldc_iommu_release(lp); |
1294 | |
1295 | kfree(objp: lp); |
1296 | } |
1297 | EXPORT_SYMBOL(ldc_free); |
1298 | |
1299 | /* Bind the channel. This registers the LDC queues with |
1300 | * the hypervisor and puts the channel into a pseudo-listening |
1301 | * state. This does not initiate a handshake, ldc_connect() does |
1302 | * that. |
1303 | */ |
1304 | int ldc_bind(struct ldc_channel *lp) |
1305 | { |
1306 | unsigned long hv_err, flags; |
1307 | int err = -EINVAL; |
1308 | |
1309 | if (lp->state != LDC_STATE_INIT) |
1310 | return -EINVAL; |
1311 | |
1312 | spin_lock_irqsave(&lp->lock, flags); |
1313 | |
1314 | enable_irq(irq: lp->cfg.rx_irq); |
1315 | enable_irq(irq: lp->cfg.tx_irq); |
1316 | |
1317 | lp->flags |= LDC_FLAG_REGISTERED_IRQS; |
1318 | |
1319 | err = -ENODEV; |
1320 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); |
1321 | if (hv_err) |
1322 | goto out_free_irqs; |
1323 | |
1324 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
1325 | if (hv_err) |
1326 | goto out_free_irqs; |
1327 | |
1328 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); |
1329 | if (hv_err) |
1330 | goto out_unmap_tx; |
1331 | |
1332 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
1333 | if (hv_err) |
1334 | goto out_unmap_tx; |
1335 | |
1336 | lp->flags |= LDC_FLAG_REGISTERED_QUEUES; |
1337 | |
1338 | hv_err = sun4v_ldc_tx_get_state(lp->id, |
1339 | &lp->tx_head, |
1340 | &lp->tx_tail, |
1341 | &lp->chan_state); |
1342 | err = -EBUSY; |
1343 | if (hv_err) |
1344 | goto out_unmap_rx; |
1345 | |
1346 | lp->tx_acked = lp->tx_head; |
1347 | |
1348 | lp->hs_state = LDC_HS_OPEN; |
1349 | ldc_set_state(lp, LDC_STATE_BOUND); |
1350 | |
1351 | if (lp->cfg.mode == LDC_MODE_RAW) { |
1352 | /* |
1353 | * There is no handshake in RAW mode, so handshake |
1354 | * is completed. |
1355 | */ |
1356 | lp->hs_state = LDC_HS_COMPLETE; |
1357 | } |
1358 | |
1359 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1360 | |
1361 | return 0; |
1362 | |
1363 | out_unmap_rx: |
1364 | lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES; |
1365 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
1366 | |
1367 | out_unmap_tx: |
1368 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
1369 | |
1370 | out_free_irqs: |
1371 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
1372 | free_irq(lp->cfg.tx_irq, lp); |
1373 | free_irq(lp->cfg.rx_irq, lp); |
1374 | |
1375 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1376 | |
1377 | return err; |
1378 | } |
1379 | EXPORT_SYMBOL(ldc_bind); |
1380 | |
1381 | int ldc_connect(struct ldc_channel *lp) |
1382 | { |
1383 | unsigned long flags; |
1384 | int err; |
1385 | |
1386 | if (lp->cfg.mode == LDC_MODE_RAW) |
1387 | return -EINVAL; |
1388 | |
1389 | spin_lock_irqsave(&lp->lock, flags); |
1390 | |
1391 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || |
1392 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) || |
1393 | lp->hs_state != LDC_HS_OPEN) |
1394 | err = ((lp->hs_state > LDC_HS_OPEN) ? 0 : -EINVAL); |
1395 | else |
1396 | err = start_handshake(lp); |
1397 | |
1398 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1399 | |
1400 | return err; |
1401 | } |
1402 | EXPORT_SYMBOL(ldc_connect); |
1403 | |
1404 | int ldc_disconnect(struct ldc_channel *lp) |
1405 | { |
1406 | unsigned long hv_err, flags; |
1407 | int err; |
1408 | |
1409 | if (lp->cfg.mode == LDC_MODE_RAW) |
1410 | return -EINVAL; |
1411 | |
1412 | if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) || |
1413 | !(lp->flags & LDC_FLAG_REGISTERED_QUEUES)) |
1414 | return -EINVAL; |
1415 | |
1416 | spin_lock_irqsave(&lp->lock, flags); |
1417 | |
1418 | err = -ENODEV; |
1419 | hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0); |
1420 | if (hv_err) |
1421 | goto out_err; |
1422 | |
1423 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); |
1424 | if (hv_err) |
1425 | goto out_err; |
1426 | |
1427 | hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0); |
1428 | if (hv_err) |
1429 | goto out_err; |
1430 | |
1431 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); |
1432 | if (hv_err) |
1433 | goto out_err; |
1434 | |
1435 | ldc_set_state(lp, LDC_STATE_BOUND); |
1436 | lp->hs_state = LDC_HS_OPEN; |
1437 | lp->flags |= LDC_FLAG_RESET; |
1438 | |
1439 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1440 | |
1441 | return 0; |
1442 | |
1443 | out_err: |
1444 | sun4v_ldc_tx_qconf(lp->id, 0, 0); |
1445 | sun4v_ldc_rx_qconf(lp->id, 0, 0); |
1446 | free_irq(lp->cfg.tx_irq, lp); |
1447 | free_irq(lp->cfg.rx_irq, lp); |
1448 | lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS | |
1449 | LDC_FLAG_REGISTERED_QUEUES); |
1450 | ldc_set_state(lp, LDC_STATE_INIT); |
1451 | |
1452 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1453 | |
1454 | return err; |
1455 | } |
1456 | EXPORT_SYMBOL(ldc_disconnect); |
1457 | |
1458 | int ldc_state(struct ldc_channel *lp) |
1459 | { |
1460 | return lp->state; |
1461 | } |
1462 | EXPORT_SYMBOL(ldc_state); |
1463 | |
1464 | void ldc_set_state(struct ldc_channel *lp, u8 state) |
1465 | { |
1466 | ldcdbg(STATE, "STATE (%s) --> (%s)\n" , |
1467 | state_to_str(lp->state), |
1468 | state_to_str(state)); |
1469 | |
1470 | lp->state = state; |
1471 | } |
1472 | EXPORT_SYMBOL(ldc_set_state); |
1473 | |
1474 | int ldc_mode(struct ldc_channel *lp) |
1475 | { |
1476 | return lp->cfg.mode; |
1477 | } |
1478 | EXPORT_SYMBOL(ldc_mode); |
1479 | |
1480 | int ldc_rx_reset(struct ldc_channel *lp) |
1481 | { |
1482 | return __set_rx_head(lp, head: lp->rx_tail); |
1483 | } |
1484 | EXPORT_SYMBOL(ldc_rx_reset); |
1485 | |
1486 | void __ldc_print(struct ldc_channel *lp, const char *caller) |
1487 | { |
1488 | pr_info("%s: id=0x%lx flags=0x%x state=%s cstate=0x%lx hsstate=0x%x\n" |
1489 | "\trx_h=0x%lx rx_t=0x%lx rx_n=%ld\n" |
1490 | "\ttx_h=0x%lx tx_t=0x%lx tx_n=%ld\n" |
1491 | "\trcv_nxt=%u snd_nxt=%u\n" , |
1492 | caller, lp->id, lp->flags, state_to_str(lp->state), |
1493 | lp->chan_state, lp->hs_state, |
1494 | lp->rx_head, lp->rx_tail, lp->rx_num_entries, |
1495 | lp->tx_head, lp->tx_tail, lp->tx_num_entries, |
1496 | lp->rcv_nxt, lp->snd_nxt); |
1497 | } |
1498 | EXPORT_SYMBOL(__ldc_print); |
1499 | |
1500 | static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) |
1501 | { |
1502 | struct ldc_packet *p; |
1503 | unsigned long new_tail, hv_err; |
1504 | int err; |
1505 | |
1506 | hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, |
1507 | &lp->chan_state); |
1508 | if (unlikely(hv_err)) |
1509 | return -EBUSY; |
1510 | |
1511 | if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) |
1512 | return LDC_ABORT(lp); |
1513 | |
1514 | if (size > LDC_PACKET_SIZE) |
1515 | return -EMSGSIZE; |
1516 | |
1517 | p = data_get_tx_packet(lp, new_tail: &new_tail); |
1518 | if (!p) |
1519 | return -EAGAIN; |
1520 | |
1521 | memcpy(p, buf, size); |
1522 | |
1523 | err = send_tx_packet(lp, p, new_tail); |
1524 | if (!err) |
1525 | err = size; |
1526 | |
1527 | return err; |
1528 | } |
1529 | |
1530 | static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size) |
1531 | { |
1532 | struct ldc_packet *p; |
1533 | unsigned long hv_err, new; |
1534 | int err; |
1535 | |
1536 | if (size < LDC_PACKET_SIZE) |
1537 | return -EINVAL; |
1538 | |
1539 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
1540 | &lp->rx_head, |
1541 | &lp->rx_tail, |
1542 | &lp->chan_state); |
1543 | if (hv_err) |
1544 | return LDC_ABORT(lp); |
1545 | |
1546 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
1547 | lp->chan_state == LDC_CHANNEL_RESETTING) |
1548 | return -ECONNRESET; |
1549 | |
1550 | if (lp->rx_head == lp->rx_tail) |
1551 | return 0; |
1552 | |
1553 | p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE); |
1554 | memcpy(buf, p, LDC_PACKET_SIZE); |
1555 | |
1556 | new = rx_advance(lp, off: lp->rx_head); |
1557 | lp->rx_head = new; |
1558 | |
1559 | err = __set_rx_head(lp, head: new); |
1560 | if (err < 0) |
1561 | err = -ECONNRESET; |
1562 | else |
1563 | err = LDC_PACKET_SIZE; |
1564 | |
1565 | return err; |
1566 | } |
1567 | |
1568 | static const struct ldc_mode_ops raw_ops = { |
1569 | .write = write_raw, |
1570 | .read = read_raw, |
1571 | }; |
1572 | |
1573 | static int write_nonraw(struct ldc_channel *lp, const void *buf, |
1574 | unsigned int size) |
1575 | { |
1576 | unsigned long hv_err, tail; |
1577 | unsigned int copied; |
1578 | u32 seq; |
1579 | int err; |
1580 | |
1581 | hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail, |
1582 | &lp->chan_state); |
1583 | if (unlikely(hv_err)) |
1584 | return -EBUSY; |
1585 | |
1586 | if (unlikely(lp->chan_state != LDC_CHANNEL_UP)) |
1587 | return LDC_ABORT(lp); |
1588 | |
1589 | if (!tx_has_space_for(lp, size)) |
1590 | return -EAGAIN; |
1591 | |
1592 | seq = lp->snd_nxt; |
1593 | copied = 0; |
1594 | tail = lp->tx_tail; |
1595 | while (copied < size) { |
1596 | struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE); |
1597 | u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ? |
1598 | p->u.u_data : |
1599 | p->u.r.r_data); |
1600 | int data_len; |
1601 | |
1602 | p->type = LDC_DATA; |
1603 | p->stype = LDC_INFO; |
1604 | p->ctrl = 0; |
1605 | |
1606 | data_len = size - copied; |
1607 | if (data_len > lp->mss) |
1608 | data_len = lp->mss; |
1609 | |
1610 | BUG_ON(data_len > LDC_LEN); |
1611 | |
1612 | p->env = (data_len | |
1613 | (copied == 0 ? LDC_START : 0) | |
1614 | (data_len == size - copied ? LDC_STOP : 0)); |
1615 | |
1616 | p->seqid = ++seq; |
1617 | |
1618 | ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n" , |
1619 | p->type, |
1620 | p->stype, |
1621 | p->ctrl, |
1622 | p->env, |
1623 | p->seqid); |
1624 | |
1625 | memcpy(data, buf, data_len); |
1626 | buf += data_len; |
1627 | copied += data_len; |
1628 | |
1629 | tail = tx_advance(lp, off: tail); |
1630 | } |
1631 | |
1632 | err = set_tx_tail(lp, tail); |
1633 | if (!err) { |
1634 | lp->snd_nxt = seq; |
1635 | err = size; |
1636 | } |
1637 | |
1638 | return err; |
1639 | } |
1640 | |
1641 | static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p, |
1642 | struct ldc_packet *first_frag) |
1643 | { |
1644 | int err; |
1645 | |
1646 | if (first_frag) |
1647 | lp->rcv_nxt = first_frag->seqid - 1; |
1648 | |
1649 | err = send_data_nack(lp, data_pkt: p); |
1650 | if (err) |
1651 | return err; |
1652 | |
1653 | err = ldc_rx_reset(lp); |
1654 | if (err < 0) |
1655 | return LDC_ABORT(lp); |
1656 | |
1657 | return 0; |
1658 | } |
1659 | |
1660 | static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p) |
1661 | { |
1662 | if (p->stype & LDC_ACK) { |
1663 | int err = process_data_ack(lp, ack: p); |
1664 | if (err) |
1665 | return err; |
1666 | } |
1667 | if (p->stype & LDC_NACK) |
1668 | return LDC_ABORT(lp); |
1669 | |
1670 | return 0; |
1671 | } |
1672 | |
1673 | static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head) |
1674 | { |
1675 | unsigned long dummy; |
1676 | int limit = 1000; |
1677 | |
1678 | ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n" , |
1679 | cur_head, lp->rx_head, lp->rx_tail); |
1680 | while (limit-- > 0) { |
1681 | unsigned long hv_err; |
1682 | |
1683 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
1684 | &dummy, |
1685 | &lp->rx_tail, |
1686 | &lp->chan_state); |
1687 | if (hv_err) |
1688 | return LDC_ABORT(lp); |
1689 | |
1690 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
1691 | lp->chan_state == LDC_CHANNEL_RESETTING) |
1692 | return -ECONNRESET; |
1693 | |
1694 | if (cur_head != lp->rx_tail) { |
1695 | ldcdbg(DATA, "DATA WAIT DONE " |
1696 | "head[%lx] tail[%lx] chan_state[%lx]\n" , |
1697 | dummy, lp->rx_tail, lp->chan_state); |
1698 | return 0; |
1699 | } |
1700 | |
1701 | udelay(1); |
1702 | } |
1703 | return -EAGAIN; |
1704 | } |
1705 | |
1706 | static int rx_set_head(struct ldc_channel *lp, unsigned long head) |
1707 | { |
1708 | int err = __set_rx_head(lp, head); |
1709 | |
1710 | if (err < 0) |
1711 | return LDC_ABORT(lp); |
1712 | |
1713 | lp->rx_head = head; |
1714 | return 0; |
1715 | } |
1716 | |
1717 | static void send_data_ack(struct ldc_channel *lp) |
1718 | { |
1719 | unsigned long new_tail; |
1720 | struct ldc_packet *p; |
1721 | |
1722 | p = data_get_tx_packet(lp, new_tail: &new_tail); |
1723 | if (likely(p)) { |
1724 | int err; |
1725 | |
1726 | memset(p, 0, sizeof(*p)); |
1727 | p->type = LDC_DATA; |
1728 | p->stype = LDC_ACK; |
1729 | p->ctrl = 0; |
1730 | p->seqid = lp->snd_nxt + 1; |
1731 | p->u.r.ackid = lp->rcv_nxt; |
1732 | |
1733 | err = send_tx_packet(lp, p, new_tail); |
1734 | if (!err) |
1735 | lp->snd_nxt++; |
1736 | } |
1737 | } |
1738 | |
1739 | static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size) |
1740 | { |
1741 | struct ldc_packet *first_frag; |
1742 | unsigned long hv_err, new; |
1743 | int err, copied; |
1744 | |
1745 | hv_err = sun4v_ldc_rx_get_state(lp->id, |
1746 | &lp->rx_head, |
1747 | &lp->rx_tail, |
1748 | &lp->chan_state); |
1749 | if (hv_err) |
1750 | return LDC_ABORT(lp); |
1751 | |
1752 | if (lp->chan_state == LDC_CHANNEL_DOWN || |
1753 | lp->chan_state == LDC_CHANNEL_RESETTING) |
1754 | return -ECONNRESET; |
1755 | |
1756 | if (lp->rx_head == lp->rx_tail) |
1757 | return 0; |
1758 | |
1759 | first_frag = NULL; |
1760 | copied = err = 0; |
1761 | new = lp->rx_head; |
1762 | while (1) { |
1763 | struct ldc_packet *p; |
1764 | int pkt_len; |
1765 | |
1766 | BUG_ON(new == lp->rx_tail); |
1767 | p = lp->rx_base + (new / LDC_PACKET_SIZE); |
1768 | |
1769 | ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " |
1770 | "rcv_nxt[%08x]\n" , |
1771 | p->type, |
1772 | p->stype, |
1773 | p->ctrl, |
1774 | p->env, |
1775 | p->seqid, |
1776 | p->u.r.ackid, |
1777 | lp->rcv_nxt); |
1778 | |
1779 | if (unlikely(!rx_seq_ok(lp, p->seqid))) { |
1780 | err = rx_bad_seq(lp, p, first_frag); |
1781 | copied = 0; |
1782 | break; |
1783 | } |
1784 | |
1785 | if (p->type & LDC_CTRL) { |
1786 | err = process_control_frame(lp, p); |
1787 | if (err < 0) |
1788 | break; |
1789 | err = 0; |
1790 | } |
1791 | |
1792 | lp->rcv_nxt = p->seqid; |
1793 | |
1794 | /* |
1795 | * If this is a control-only packet, there is nothing |
1796 | * else to do but advance the rx queue since the packet |
1797 | * was already processed above. |
1798 | */ |
1799 | if (!(p->type & LDC_DATA)) { |
1800 | new = rx_advance(lp, off: new); |
1801 | break; |
1802 | } |
1803 | if (p->stype & (LDC_ACK | LDC_NACK)) { |
1804 | err = data_ack_nack(lp, p); |
1805 | if (err) |
1806 | break; |
1807 | } |
1808 | if (!(p->stype & LDC_INFO)) { |
1809 | new = rx_advance(lp, off: new); |
1810 | err = rx_set_head(lp, head: new); |
1811 | if (err) |
1812 | break; |
1813 | goto no_data; |
1814 | } |
1815 | |
1816 | pkt_len = p->env & LDC_LEN; |
1817 | |
1818 | /* Every initial packet starts with the START bit set. |
1819 | * |
1820 | * Singleton packets will have both START+STOP set. |
1821 | * |
1822 | * Fragments will have START set in the first frame, STOP |
1823 | * set in the last frame, and neither bit set in middle |
1824 | * frames of the packet. |
1825 | * |
1826 | * Therefore if we are at the beginning of a packet and |
1827 | * we don't see START, or we are in the middle of a fragmented |
1828 | * packet and do see START, we are unsynchronized and should |
1829 | * flush the RX queue. |
1830 | */ |
1831 | if ((first_frag == NULL && !(p->env & LDC_START)) || |
1832 | (first_frag != NULL && (p->env & LDC_START))) { |
1833 | if (!first_frag) |
1834 | new = rx_advance(lp, off: new); |
1835 | |
1836 | err = rx_set_head(lp, head: new); |
1837 | if (err) |
1838 | break; |
1839 | |
1840 | if (!first_frag) |
1841 | goto no_data; |
1842 | } |
1843 | if (!first_frag) |
1844 | first_frag = p; |
1845 | |
1846 | if (pkt_len > size - copied) { |
1847 | /* User didn't give us a big enough buffer, |
1848 | * what to do? This is a pretty serious error. |
1849 | * |
1850 | * Since we haven't updated the RX ring head to |
1851 | * consume any of the packets, signal the error |
1852 | * to the user and just leave the RX ring alone. |
1853 | * |
1854 | * This seems the best behavior because this allows |
1855 | * a user of the LDC layer to start with a small |
1856 | * RX buffer for ldc_read() calls and use -EMSGSIZE |
1857 | * as a cue to enlarge its read buffer. |
1858 | */ |
1859 | err = -EMSGSIZE; |
1860 | break; |
1861 | } |
1862 | |
1863 | /* Ok, we are gonna eat this one. */ |
1864 | new = rx_advance(lp, off: new); |
1865 | |
1866 | memcpy(buf, |
1867 | (lp->cfg.mode == LDC_MODE_UNRELIABLE ? |
1868 | p->u.u_data : p->u.r.r_data), pkt_len); |
1869 | buf += pkt_len; |
1870 | copied += pkt_len; |
1871 | |
1872 | if (p->env & LDC_STOP) |
1873 | break; |
1874 | |
1875 | no_data: |
1876 | if (new == lp->rx_tail) { |
1877 | err = rx_data_wait(lp, cur_head: new); |
1878 | if (err) |
1879 | break; |
1880 | } |
1881 | } |
1882 | |
1883 | if (!err) |
1884 | err = rx_set_head(lp, head: new); |
1885 | |
1886 | if (err && first_frag) |
1887 | lp->rcv_nxt = first_frag->seqid - 1; |
1888 | |
1889 | if (!err) { |
1890 | err = copied; |
1891 | if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) |
1892 | send_data_ack(lp); |
1893 | } |
1894 | |
1895 | return err; |
1896 | } |
1897 | |
1898 | static const struct ldc_mode_ops nonraw_ops = { |
1899 | .write = write_nonraw, |
1900 | .read = read_nonraw, |
1901 | }; |
1902 | |
1903 | static int write_stream(struct ldc_channel *lp, const void *buf, |
1904 | unsigned int size) |
1905 | { |
1906 | if (size > lp->cfg.mtu) |
1907 | size = lp->cfg.mtu; |
1908 | return write_nonraw(lp, buf, size); |
1909 | } |
1910 | |
1911 | static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size) |
1912 | { |
1913 | if (!lp->mssbuf_len) { |
1914 | int err = read_nonraw(lp, buf: lp->mssbuf, size: lp->cfg.mtu); |
1915 | if (err < 0) |
1916 | return err; |
1917 | |
1918 | lp->mssbuf_len = err; |
1919 | lp->mssbuf_off = 0; |
1920 | } |
1921 | |
1922 | if (size > lp->mssbuf_len) |
1923 | size = lp->mssbuf_len; |
1924 | memcpy(buf, lp->mssbuf + lp->mssbuf_off, size); |
1925 | |
1926 | lp->mssbuf_off += size; |
1927 | lp->mssbuf_len -= size; |
1928 | |
1929 | return size; |
1930 | } |
1931 | |
1932 | static const struct ldc_mode_ops stream_ops = { |
1933 | .write = write_stream, |
1934 | .read = read_stream, |
1935 | }; |
1936 | |
1937 | int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size) |
1938 | { |
1939 | unsigned long flags; |
1940 | int err; |
1941 | |
1942 | if (!buf) |
1943 | return -EINVAL; |
1944 | |
1945 | if (!size) |
1946 | return 0; |
1947 | |
1948 | spin_lock_irqsave(&lp->lock, flags); |
1949 | |
1950 | if (lp->hs_state != LDC_HS_COMPLETE) |
1951 | err = -ENOTCONN; |
1952 | else |
1953 | err = lp->mops->write(lp, buf, size); |
1954 | |
1955 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1956 | |
1957 | return err; |
1958 | } |
1959 | EXPORT_SYMBOL(ldc_write); |
1960 | |
1961 | int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size) |
1962 | { |
1963 | unsigned long flags; |
1964 | int err; |
1965 | |
1966 | ldcdbg(RX, "%s: entered size=%d\n" , __func__, size); |
1967 | |
1968 | if (!buf) |
1969 | return -EINVAL; |
1970 | |
1971 | if (!size) |
1972 | return 0; |
1973 | |
1974 | spin_lock_irqsave(&lp->lock, flags); |
1975 | |
1976 | if (lp->hs_state != LDC_HS_COMPLETE) |
1977 | err = -ENOTCONN; |
1978 | else |
1979 | err = lp->mops->read(lp, buf, size); |
1980 | |
1981 | spin_unlock_irqrestore(lock: &lp->lock, flags); |
1982 | |
1983 | ldcdbg(RX, "%s: mode=%d, head=%lu, tail=%lu rv=%d\n" , __func__, |
1984 | lp->cfg.mode, lp->rx_head, lp->rx_tail, err); |
1985 | |
1986 | return err; |
1987 | } |
1988 | EXPORT_SYMBOL(ldc_read); |
1989 | |
1990 | static u64 pagesize_code(void) |
1991 | { |
1992 | switch (PAGE_SIZE) { |
1993 | default: |
1994 | case (8ULL * 1024ULL): |
1995 | return 0; |
1996 | case (64ULL * 1024ULL): |
1997 | return 1; |
1998 | case (512ULL * 1024ULL): |
1999 | return 2; |
2000 | case (4ULL * 1024ULL * 1024ULL): |
2001 | return 3; |
2002 | case (32ULL * 1024ULL * 1024ULL): |
2003 | return 4; |
2004 | case (256ULL * 1024ULL * 1024ULL): |
2005 | return 5; |
2006 | } |
2007 | } |
2008 | |
2009 | static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset) |
2010 | { |
2011 | return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) | |
2012 | (index << PAGE_SHIFT) | |
2013 | page_offset); |
2014 | } |
2015 | |
2016 | |
2017 | static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, |
2018 | unsigned long npages) |
2019 | { |
2020 | long entry; |
2021 | |
2022 | entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table, |
2023 | npages, NULL, (unsigned long)-1, 0); |
2024 | if (unlikely(entry == IOMMU_ERROR_CODE)) |
2025 | return NULL; |
2026 | |
2027 | return iommu->page_table + entry; |
2028 | } |
2029 | |
2030 | static u64 perm_to_mte(unsigned int map_perm) |
2031 | { |
2032 | u64 mte_base; |
2033 | |
2034 | mte_base = pagesize_code(); |
2035 | |
2036 | if (map_perm & LDC_MAP_SHADOW) { |
2037 | if (map_perm & LDC_MAP_R) |
2038 | mte_base |= LDC_MTE_COPY_R; |
2039 | if (map_perm & LDC_MAP_W) |
2040 | mte_base |= LDC_MTE_COPY_W; |
2041 | } |
2042 | if (map_perm & LDC_MAP_DIRECT) { |
2043 | if (map_perm & LDC_MAP_R) |
2044 | mte_base |= LDC_MTE_READ; |
2045 | if (map_perm & LDC_MAP_W) |
2046 | mte_base |= LDC_MTE_WRITE; |
2047 | if (map_perm & LDC_MAP_X) |
2048 | mte_base |= LDC_MTE_EXEC; |
2049 | } |
2050 | if (map_perm & LDC_MAP_IO) { |
2051 | if (map_perm & LDC_MAP_R) |
2052 | mte_base |= LDC_MTE_IOMMU_R; |
2053 | if (map_perm & LDC_MAP_W) |
2054 | mte_base |= LDC_MTE_IOMMU_W; |
2055 | } |
2056 | |
2057 | return mte_base; |
2058 | } |
2059 | |
2060 | static int pages_in_region(unsigned long base, long len) |
2061 | { |
2062 | int count = 0; |
2063 | |
2064 | do { |
2065 | unsigned long new = (base + PAGE_SIZE) & PAGE_MASK; |
2066 | |
2067 | len -= (new - base); |
2068 | base = new; |
2069 | count++; |
2070 | } while (len > 0); |
2071 | |
2072 | return count; |
2073 | } |
2074 | |
2075 | struct cookie_state { |
2076 | struct ldc_mtable_entry *page_table; |
2077 | struct ldc_trans_cookie *cookies; |
2078 | u64 mte_base; |
2079 | u64 prev_cookie; |
2080 | u32 pte_idx; |
2081 | u32 nc; |
2082 | }; |
2083 | |
2084 | static void fill_cookies(struct cookie_state *sp, unsigned long pa, |
2085 | unsigned long off, unsigned long len) |
2086 | { |
2087 | do { |
2088 | unsigned long tlen, new = pa + PAGE_SIZE; |
2089 | u64 this_cookie; |
2090 | |
2091 | sp->page_table[sp->pte_idx].mte = sp->mte_base | pa; |
2092 | |
2093 | tlen = PAGE_SIZE; |
2094 | if (off) |
2095 | tlen = PAGE_SIZE - off; |
2096 | if (tlen > len) |
2097 | tlen = len; |
2098 | |
2099 | this_cookie = make_cookie(index: sp->pte_idx, |
2100 | pgsz_code: pagesize_code(), page_offset: off); |
2101 | |
2102 | off = 0; |
2103 | |
2104 | if (this_cookie == sp->prev_cookie) { |
2105 | sp->cookies[sp->nc - 1].cookie_size += tlen; |
2106 | } else { |
2107 | sp->cookies[sp->nc].cookie_addr = this_cookie; |
2108 | sp->cookies[sp->nc].cookie_size = tlen; |
2109 | sp->nc++; |
2110 | } |
2111 | sp->prev_cookie = this_cookie + tlen; |
2112 | |
2113 | sp->pte_idx++; |
2114 | |
2115 | len -= tlen; |
2116 | pa = new; |
2117 | } while (len > 0); |
2118 | } |
2119 | |
2120 | static int sg_count_one(struct scatterlist *sg) |
2121 | { |
2122 | unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; |
2123 | long len = sg->length; |
2124 | |
2125 | if ((sg->offset | len) & (8UL - 1)) |
2126 | return -EFAULT; |
2127 | |
2128 | return pages_in_region(base: base + sg->offset, len); |
2129 | } |
2130 | |
2131 | static int sg_count_pages(struct scatterlist *sg, int num_sg) |
2132 | { |
2133 | int count; |
2134 | int i; |
2135 | |
2136 | count = 0; |
2137 | for (i = 0; i < num_sg; i++) { |
2138 | int err = sg_count_one(sg: sg + i); |
2139 | if (err < 0) |
2140 | return err; |
2141 | count += err; |
2142 | } |
2143 | |
2144 | return count; |
2145 | } |
2146 | |
2147 | int ldc_map_sg(struct ldc_channel *lp, |
2148 | struct scatterlist *sg, int num_sg, |
2149 | struct ldc_trans_cookie *cookies, int ncookies, |
2150 | unsigned int map_perm) |
2151 | { |
2152 | unsigned long i, npages; |
2153 | struct ldc_mtable_entry *base; |
2154 | struct cookie_state state; |
2155 | struct ldc_iommu *iommu; |
2156 | int err; |
2157 | struct scatterlist *s; |
2158 | |
2159 | if (map_perm & ~LDC_MAP_ALL) |
2160 | return -EINVAL; |
2161 | |
2162 | err = sg_count_pages(sg, num_sg); |
2163 | if (err < 0) |
2164 | return err; |
2165 | |
2166 | npages = err; |
2167 | if (err > ncookies) |
2168 | return -EMSGSIZE; |
2169 | |
2170 | iommu = &lp->iommu; |
2171 | |
2172 | base = alloc_npages(iommu, npages); |
2173 | |
2174 | if (!base) |
2175 | return -ENOMEM; |
2176 | |
2177 | state.page_table = iommu->page_table; |
2178 | state.cookies = cookies; |
2179 | state.mte_base = perm_to_mte(map_perm); |
2180 | state.prev_cookie = ~(u64)0; |
2181 | state.pte_idx = (base - iommu->page_table); |
2182 | state.nc = 0; |
2183 | |
2184 | for_each_sg(sg, s, num_sg, i) { |
2185 | fill_cookies(sp: &state, page_to_pfn(sg_page(s)) << PAGE_SHIFT, |
2186 | off: s->offset, len: s->length); |
2187 | } |
2188 | |
2189 | return state.nc; |
2190 | } |
2191 | EXPORT_SYMBOL(ldc_map_sg); |
2192 | |
2193 | int ldc_map_single(struct ldc_channel *lp, |
2194 | void *buf, unsigned int len, |
2195 | struct ldc_trans_cookie *cookies, int ncookies, |
2196 | unsigned int map_perm) |
2197 | { |
2198 | unsigned long npages, pa; |
2199 | struct ldc_mtable_entry *base; |
2200 | struct cookie_state state; |
2201 | struct ldc_iommu *iommu; |
2202 | |
2203 | if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1)) |
2204 | return -EINVAL; |
2205 | |
2206 | pa = __pa(buf); |
2207 | if ((pa | len) & (8UL - 1)) |
2208 | return -EFAULT; |
2209 | |
2210 | npages = pages_in_region(base: pa, len); |
2211 | |
2212 | iommu = &lp->iommu; |
2213 | |
2214 | base = alloc_npages(iommu, npages); |
2215 | |
2216 | if (!base) |
2217 | return -ENOMEM; |
2218 | |
2219 | state.page_table = iommu->page_table; |
2220 | state.cookies = cookies; |
2221 | state.mte_base = perm_to_mte(map_perm); |
2222 | state.prev_cookie = ~(u64)0; |
2223 | state.pte_idx = (base - iommu->page_table); |
2224 | state.nc = 0; |
2225 | fill_cookies(sp: &state, pa: (pa & PAGE_MASK), off: (pa & ~PAGE_MASK), len); |
2226 | BUG_ON(state.nc > ncookies); |
2227 | |
2228 | return state.nc; |
2229 | } |
2230 | EXPORT_SYMBOL(ldc_map_single); |
2231 | |
2232 | |
2233 | static void free_npages(unsigned long id, struct ldc_iommu *iommu, |
2234 | u64 cookie, u64 size) |
2235 | { |
2236 | unsigned long npages, entry; |
2237 | |
2238 | npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; |
2239 | |
2240 | entry = ldc_cookie_to_index(cookie, arg: iommu); |
2241 | ldc_demap(iommu, id, cookie, entry, npages); |
2242 | iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry); |
2243 | } |
2244 | |
2245 | void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies, |
2246 | int ncookies) |
2247 | { |
2248 | struct ldc_iommu *iommu = &lp->iommu; |
2249 | int i; |
2250 | unsigned long flags; |
2251 | |
2252 | spin_lock_irqsave(&iommu->lock, flags); |
2253 | for (i = 0; i < ncookies; i++) { |
2254 | u64 addr = cookies[i].cookie_addr; |
2255 | u64 size = cookies[i].cookie_size; |
2256 | |
2257 | free_npages(id: lp->id, iommu, cookie: addr, size); |
2258 | } |
2259 | spin_unlock_irqrestore(lock: &iommu->lock, flags); |
2260 | } |
2261 | EXPORT_SYMBOL(ldc_unmap); |
2262 | |
2263 | int ldc_copy(struct ldc_channel *lp, int copy_dir, |
2264 | void *buf, unsigned int len, unsigned long offset, |
2265 | struct ldc_trans_cookie *cookies, int ncookies) |
2266 | { |
2267 | unsigned int orig_len; |
2268 | unsigned long ra; |
2269 | int i; |
2270 | |
2271 | if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) { |
2272 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n" , |
2273 | lp->id, copy_dir); |
2274 | return -EINVAL; |
2275 | } |
2276 | |
2277 | ra = __pa(buf); |
2278 | if ((ra | len | offset) & (8UL - 1)) { |
2279 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer " |
2280 | "ra[%lx] len[%x] offset[%lx]\n" , |
2281 | lp->id, ra, len, offset); |
2282 | return -EFAULT; |
2283 | } |
2284 | |
2285 | if (lp->hs_state != LDC_HS_COMPLETE || |
2286 | (lp->flags & LDC_FLAG_RESET)) { |
2287 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] " |
2288 | "flags[%x]\n" , lp->id, lp->hs_state, lp->flags); |
2289 | return -ECONNRESET; |
2290 | } |
2291 | |
2292 | orig_len = len; |
2293 | for (i = 0; i < ncookies; i++) { |
2294 | unsigned long cookie_raddr = cookies[i].cookie_addr; |
2295 | unsigned long this_len = cookies[i].cookie_size; |
2296 | unsigned long actual_len; |
2297 | |
2298 | if (unlikely(offset)) { |
2299 | unsigned long this_off = offset; |
2300 | |
2301 | if (this_off > this_len) |
2302 | this_off = this_len; |
2303 | |
2304 | offset -= this_off; |
2305 | this_len -= this_off; |
2306 | if (!this_len) |
2307 | continue; |
2308 | cookie_raddr += this_off; |
2309 | } |
2310 | |
2311 | if (this_len > len) |
2312 | this_len = len; |
2313 | |
2314 | while (1) { |
2315 | unsigned long hv_err; |
2316 | |
2317 | hv_err = sun4v_ldc_copy(lp->id, copy_dir, |
2318 | cookie_raddr, ra, |
2319 | this_len, &actual_len); |
2320 | if (unlikely(hv_err)) { |
2321 | printk(KERN_ERR PFX "ldc_copy: ID[%lu] " |
2322 | "HV error %lu\n" , |
2323 | lp->id, hv_err); |
2324 | if (lp->hs_state != LDC_HS_COMPLETE || |
2325 | (lp->flags & LDC_FLAG_RESET)) |
2326 | return -ECONNRESET; |
2327 | else |
2328 | return -EFAULT; |
2329 | } |
2330 | |
2331 | cookie_raddr += actual_len; |
2332 | ra += actual_len; |
2333 | len -= actual_len; |
2334 | if (actual_len == this_len) |
2335 | break; |
2336 | |
2337 | this_len -= actual_len; |
2338 | } |
2339 | |
2340 | if (!len) |
2341 | break; |
2342 | } |
2343 | |
2344 | /* It is caller policy what to do about short copies. |
2345 | * For example, a networking driver can declare the |
2346 | * packet a runt and drop it. |
2347 | */ |
2348 | |
2349 | return orig_len - len; |
2350 | } |
2351 | EXPORT_SYMBOL(ldc_copy); |
2352 | |
2353 | void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len, |
2354 | struct ldc_trans_cookie *cookies, int *ncookies, |
2355 | unsigned int map_perm) |
2356 | { |
2357 | void *buf; |
2358 | int err; |
2359 | |
2360 | if (len & (8UL - 1)) |
2361 | return ERR_PTR(error: -EINVAL); |
2362 | |
2363 | buf = kzalloc(size: len, GFP_ATOMIC); |
2364 | if (!buf) |
2365 | return ERR_PTR(error: -ENOMEM); |
2366 | |
2367 | err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); |
2368 | if (err < 0) { |
2369 | kfree(objp: buf); |
2370 | return ERR_PTR(error: err); |
2371 | } |
2372 | *ncookies = err; |
2373 | |
2374 | return buf; |
2375 | } |
2376 | EXPORT_SYMBOL(ldc_alloc_exp_dring); |
2377 | |
2378 | void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len, |
2379 | struct ldc_trans_cookie *cookies, int ncookies) |
2380 | { |
2381 | ldc_unmap(lp, cookies, ncookies); |
2382 | kfree(objp: buf); |
2383 | } |
2384 | EXPORT_SYMBOL(ldc_free_exp_dring); |
2385 | |
2386 | static int __init ldc_init(void) |
2387 | { |
2388 | unsigned long major, minor; |
2389 | struct mdesc_handle *hp; |
2390 | const u64 *v; |
2391 | int err; |
2392 | u64 mp; |
2393 | |
2394 | hp = mdesc_grab(); |
2395 | if (!hp) |
2396 | return -ENODEV; |
2397 | |
2398 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform" ); |
2399 | err = -ENODEV; |
2400 | if (mp == MDESC_NODE_NULL) |
2401 | goto out; |
2402 | |
2403 | v = mdesc_get_property(hp, mp, "domaining-enabled" , NULL); |
2404 | if (!v) |
2405 | goto out; |
2406 | |
2407 | major = 1; |
2408 | minor = 0; |
2409 | if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) { |
2410 | printk(KERN_INFO PFX "Could not register LDOM hvapi.\n" ); |
2411 | goto out; |
2412 | } |
2413 | |
2414 | printk(KERN_INFO "%s" , version); |
2415 | |
2416 | if (!*v) { |
2417 | printk(KERN_INFO PFX "Domaining disabled.\n" ); |
2418 | goto out; |
2419 | } |
2420 | ldom_domaining_enabled = 1; |
2421 | err = 0; |
2422 | |
2423 | out: |
2424 | mdesc_release(hp); |
2425 | return err; |
2426 | } |
2427 | |
2428 | core_initcall(ldc_init); |
2429 | |