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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e53e97ce DM |
2 | /* ldc.c: Logical Domain Channel link-layer protocol driver. |
3 | * | |
b7c2a757 | 4 | * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net> |
e53e97ce DM |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
066bcaca | 8 | #include <linux/export.h> |
e53e97ce DM |
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> | |
e756fd80 | 18 | #include <linux/bitmap.h> |
0ae53ed1 | 19 | #include <linux/iommu-common.h> |
e53e97ce DM |
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 ": " | |
b7c2a757 DM |
29 | #define DRV_MODULE_VERSION "1.1" |
30 | #define DRV_MODULE_RELDATE "July 22, 2008" | |
e53e97ce | 31 | |
0ae53ed1 SV |
32 | #define COOKIE_PGSZ_CODE 0xf000000000000000ULL |
33 | #define COOKIE_PGSZ_CODE_SHIFT 60ULL | |
34 | ||
35 | ||
7c9503b8 | 36 | static char version[] = |
e53e97ce | 37 | DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n"; |
e53e97ce DM |
38 | |
39 | /* Packet header layout for unreliable and reliable mode frames. | |
40 | * When in RAW mode, packets are simply straight 64-byte payloads | |
41 | * with no headers. | |
42 | */ | |
43 | struct ldc_packet { | |
44 | u8 type; | |
45 | #define LDC_CTRL 0x01 | |
46 | #define LDC_DATA 0x02 | |
47 | #define LDC_ERR 0x10 | |
48 | ||
49 | u8 stype; | |
50 | #define LDC_INFO 0x01 | |
51 | #define LDC_ACK 0x02 | |
52 | #define LDC_NACK 0x04 | |
53 | ||
54 | u8 ctrl; | |
55 | #define LDC_VERS 0x01 /* Link Version */ | |
56 | #define LDC_RTS 0x02 /* Request To Send */ | |
57 | #define LDC_RTR 0x03 /* Ready To Receive */ | |
58 | #define LDC_RDX 0x04 /* Ready for Data eXchange */ | |
59 | #define LDC_CTRL_MSK 0x0f | |
60 | ||
61 | u8 env; | |
62 | #define LDC_LEN 0x3f | |
63 | #define LDC_FRAG_MASK 0xc0 | |
64 | #define LDC_START 0x40 | |
65 | #define LDC_STOP 0x80 | |
66 | ||
67 | u32 seqid; | |
68 | ||
69 | union { | |
70 | u8 u_data[LDC_PACKET_SIZE - 8]; | |
71 | struct { | |
72 | u32 pad; | |
73 | u32 ackid; | |
74 | u8 r_data[LDC_PACKET_SIZE - 8 - 8]; | |
75 | } r; | |
76 | } u; | |
77 | }; | |
78 | ||
79 | struct ldc_version { | |
80 | u16 major; | |
81 | u16 minor; | |
82 | }; | |
83 | ||
84 | /* Ordered from largest major to lowest. */ | |
85 | static struct ldc_version ver_arr[] = { | |
86 | { .major = 1, .minor = 0 }, | |
87 | }; | |
88 | ||
89 | #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE) | |
90 | #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE) | |
91 | ||
92 | struct ldc_channel; | |
93 | ||
94 | struct ldc_mode_ops { | |
95 | int (*write)(struct ldc_channel *, const void *, unsigned int); | |
96 | int (*read)(struct ldc_channel *, void *, unsigned int); | |
97 | }; | |
98 | ||
99 | static const struct ldc_mode_ops raw_ops; | |
100 | static const struct ldc_mode_ops nonraw_ops; | |
101 | static const struct ldc_mode_ops stream_ops; | |
102 | ||
103 | int ldom_domaining_enabled; | |
104 | ||
105 | struct ldc_iommu { | |
0ae53ed1 | 106 | /* Protects ldc_unmap. */ |
e53e97ce | 107 | spinlock_t lock; |
e53e97ce | 108 | struct ldc_mtable_entry *page_table; |
0ae53ed1 | 109 | struct iommu_map_table iommu_map_table; |
e53e97ce DM |
110 | }; |
111 | ||
112 | struct ldc_channel { | |
113 | /* Protects all operations that depend upon channel state. */ | |
114 | spinlock_t lock; | |
115 | ||
116 | unsigned long id; | |
117 | ||
118 | u8 *mssbuf; | |
119 | u32 mssbuf_len; | |
120 | u32 mssbuf_off; | |
121 | ||
122 | struct ldc_packet *tx_base; | |
123 | unsigned long tx_head; | |
124 | unsigned long tx_tail; | |
125 | unsigned long tx_num_entries; | |
126 | unsigned long tx_ra; | |
127 | ||
128 | unsigned long tx_acked; | |
129 | ||
130 | struct ldc_packet *rx_base; | |
131 | unsigned long rx_head; | |
132 | unsigned long rx_tail; | |
133 | unsigned long rx_num_entries; | |
134 | unsigned long rx_ra; | |
135 | ||
136 | u32 rcv_nxt; | |
137 | u32 snd_nxt; | |
138 | ||
139 | unsigned long chan_state; | |
140 | ||
141 | struct ldc_channel_config cfg; | |
142 | void *event_arg; | |
143 | ||
144 | const struct ldc_mode_ops *mops; | |
145 | ||
146 | struct ldc_iommu iommu; | |
147 | ||
148 | struct ldc_version ver; | |
149 | ||
150 | u8 hs_state; | |
151 | #define LDC_HS_CLOSED 0x00 | |
152 | #define LDC_HS_OPEN 0x01 | |
153 | #define LDC_HS_GOTVERS 0x02 | |
154 | #define LDC_HS_SENTRTR 0x03 | |
155 | #define LDC_HS_GOTRTR 0x04 | |
156 | #define LDC_HS_COMPLETE 0x10 | |
157 | ||
158 | u8 flags; | |
159 | #define LDC_FLAG_ALLOCED_QUEUES 0x01 | |
160 | #define LDC_FLAG_REGISTERED_QUEUES 0x02 | |
161 | #define LDC_FLAG_REGISTERED_IRQS 0x04 | |
162 | #define LDC_FLAG_RESET 0x10 | |
163 | ||
164 | u8 mss; | |
165 | u8 state; | |
166 | ||
133f09a1 DM |
167 | #define LDC_IRQ_NAME_MAX 32 |
168 | char rx_irq_name[LDC_IRQ_NAME_MAX]; | |
169 | char tx_irq_name[LDC_IRQ_NAME_MAX]; | |
170 | ||
e53e97ce DM |
171 | struct hlist_head mh_list; |
172 | ||
173 | struct hlist_node list; | |
174 | }; | |
175 | ||
176 | #define ldcdbg(TYPE, f, a...) \ | |
177 | do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \ | |
178 | printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \ | |
179 | } while (0) | |
180 | ||
29693e75 JR |
181 | #define LDC_ABORT(lp) ldc_abort((lp), __func__) |
182 | ||
e53e97ce DM |
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 | ||
e53e97ce DM |
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, lp->rx_num_entries); | |
213 | } | |
214 | ||
215 | static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off) | |
216 | { | |
217 | return __advance(off, 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, 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 | { | |
cb481235 | 245 | if (lp->cfg.mode == LDC_MODE_STREAM) |
e53e97ce DM |
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, 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, 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, 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 | ver, sizeof(*ver), &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 | &ver, sizeof(ver), &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 | vp, sizeof(*vp), &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, 0, | |
433 | &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, 0, | |
453 | &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, 0, | |
472 | &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); | |
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; | |
cb481235 | 499 | p->seqid = lp->snd_nxt + 1; |
e53e97ce DM |
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 | ||
29693e75 | 512 | static int ldc_abort(struct ldc_channel *lp, const char *msg) |
e53e97ce DM |
513 | { |
514 | unsigned long hv_err; | |
515 | ||
29693e75 JR |
516 | ldcdbg(STATE, "ABORT[%s]\n", msg); |
517 | ldc_print(lp); | |
e53e97ce DM |
518 | |
519 | /* We report but do not act upon the hypervisor errors because | |
520 | * there really isn't much we can do if they fail at this point. | |
521 | */ | |
522 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
523 | if (hv_err) | |
524 | printk(KERN_ERR PFX "ldc_abort: " | |
525 | "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n", | |
526 | lp->id, lp->tx_ra, lp->tx_num_entries, hv_err); | |
527 | ||
528 | hv_err = sun4v_ldc_tx_get_state(lp->id, | |
529 | &lp->tx_head, | |
530 | &lp->tx_tail, | |
531 | &lp->chan_state); | |
532 | if (hv_err) | |
533 | printk(KERN_ERR PFX "ldc_abort: " | |
534 | "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n", | |
535 | lp->id, hv_err); | |
536 | ||
537 | hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries); | |
538 | if (hv_err) | |
539 | printk(KERN_ERR PFX "ldc_abort: " | |
540 | "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n", | |
541 | lp->id, lp->rx_ra, lp->rx_num_entries, hv_err); | |
542 | ||
543 | /* Refetch the RX queue state as well, because we could be invoked | |
544 | * here in the queue processing context. | |
545 | */ | |
546 | hv_err = sun4v_ldc_rx_get_state(lp->id, | |
547 | &lp->rx_head, | |
548 | &lp->rx_tail, | |
549 | &lp->chan_state); | |
550 | if (hv_err) | |
551 | printk(KERN_ERR PFX "ldc_abort: " | |
552 | "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n", | |
553 | lp->id, hv_err); | |
554 | ||
555 | return -ECONNRESET; | |
556 | } | |
557 | ||
558 | static struct ldc_version *find_by_major(u16 major) | |
559 | { | |
560 | struct ldc_version *ret = NULL; | |
561 | int i; | |
562 | ||
563 | for (i = 0; i < ARRAY_SIZE(ver_arr); i++) { | |
564 | struct ldc_version *v = &ver_arr[i]; | |
565 | if (v->major <= major) { | |
566 | ret = v; | |
567 | break; | |
568 | } | |
569 | } | |
570 | return ret; | |
571 | } | |
572 | ||
573 | static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp) | |
574 | { | |
575 | struct ldc_version *vap; | |
576 | int err; | |
577 | ||
578 | ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n", | |
579 | vp->major, vp->minor); | |
580 | ||
581 | if (lp->hs_state == LDC_HS_GOTVERS) { | |
582 | lp->hs_state = LDC_HS_OPEN; | |
583 | memset(&lp->ver, 0, sizeof(lp->ver)); | |
584 | } | |
585 | ||
586 | vap = find_by_major(vp->major); | |
587 | if (!vap) { | |
588 | err = send_version_nack(lp, 0, 0); | |
589 | } else if (vap->major != vp->major) { | |
590 | err = send_version_nack(lp, vap->major, vap->minor); | |
591 | } else { | |
592 | struct ldc_version ver = *vp; | |
593 | if (ver.minor > vap->minor) | |
594 | ver.minor = vap->minor; | |
595 | err = send_version_ack(lp, &ver); | |
596 | if (!err) { | |
597 | lp->ver = ver; | |
598 | lp->hs_state = LDC_HS_GOTVERS; | |
599 | } | |
600 | } | |
601 | if (err) | |
29693e75 | 602 | return LDC_ABORT(lp); |
e53e97ce DM |
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) | |
29693e75 | 615 | return LDC_ABORT(lp); |
e53e97ce DM |
616 | } else { |
617 | lp->ver = *vp; | |
618 | lp->hs_state = LDC_HS_GOTVERS; | |
619 | } | |
620 | if (send_rts(lp)) | |
29693e75 | 621 | return LDC_ABORT(lp); |
e53e97ce DM |
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; | |
b2c0805f SR |
628 | struct ldc_packet *p; |
629 | unsigned long new_tail; | |
e53e97ce | 630 | |
b2c0805f | 631 | if (vp->major == 0 && vp->minor == 0) |
29693e75 | 632 | return LDC_ABORT(lp); |
b2c0805f SR |
633 | |
634 | vap = find_by_major(vp->major); | |
635 | if (!vap) | |
29693e75 | 636 | return LDC_ABORT(lp); |
e53e97ce | 637 | |
b2c0805f | 638 | p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS, |
e53e97ce DM |
639 | vap, sizeof(*vap), |
640 | &new_tail); | |
b2c0805f | 641 | if (!p) |
29693e75 | 642 | return LDC_ABORT(lp); |
b2c0805f SR |
643 | |
644 | return send_tx_packet(lp, p, new_tail); | |
e53e97ce DM |
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: | |
29693e75 | 665 | return LDC_ABORT(lp); |
e53e97ce DM |
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) | |
29693e75 | 678 | return LDC_ABORT(lp); |
e53e97ce DM |
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)) | |
29693e75 | 684 | return LDC_ABORT(lp); |
e53e97ce DM |
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) | |
29693e75 | 697 | return LDC_ABORT(lp); |
e53e97ce DM |
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, p->seqid))) | |
29693e75 | 720 | return LDC_ABORT(lp); |
e53e97ce DM |
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: | |
29693e75 | 747 | return LDC_ABORT(lp); |
e53e97ce DM |
748 | } |
749 | } | |
750 | ||
751 | static int process_error_frame(struct ldc_channel *lp, | |
752 | struct ldc_packet *p) | |
753 | { | |
29693e75 | 754 | return LDC_ABORT(lp); |
e53e97ce DM |
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, head); | |
767 | ||
768 | if (p->seqid == ackid) { | |
769 | lp->tx_acked = head; | |
770 | return 0; | |
771 | } | |
cb481235 | 772 | if (head == lp->tx_tail) |
29693e75 | 773 | return LDC_ABORT(lp); |
e53e97ce DM |
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; | |
c6fee081 | 792 | unsigned long orig_state, flags; |
e53e97ce DM |
793 | unsigned int event_mask; |
794 | ||
795 | spin_lock_irqsave(&lp->lock, flags); | |
796 | ||
797 | orig_state = lp->chan_state; | |
c6fee081 DM |
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); | |
e53e97ce DM |
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 | ||
fc43b978 JR |
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 | } | |
e53e97ce DM |
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) { | |
85762a65 | 831 | (void) ldc_rx_reset(lp); |
e53e97ce DM |
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: | |
29693e75 | 882 | err = LDC_ABORT(lp); |
e53e97ce DM |
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, new); | |
896 | if (err < 0) { | |
29693e75 | 897 | (void) LDC_ABORT(lp); |
e53e97ce DM |
898 | break; |
899 | } | |
900 | if (lp->hs_state == LDC_HS_COMPLETE) | |
901 | goto handshake_complete; | |
902 | } | |
903 | ||
904 | out: | |
905 | spin_unlock_irqrestore(&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; | |
c6fee081 | 915 | unsigned long flags, orig_state; |
e53e97ce DM |
916 | unsigned int event_mask = 0; |
917 | ||
918 | spin_lock_irqsave(&lp->lock, flags); | |
919 | ||
920 | orig_state = lp->chan_state; | |
c6fee081 DM |
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); | |
e53e97ce DM |
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 | ||
fc43b978 JR |
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 | } | |
e53e97ce DM |
946 | } |
947 | ||
948 | spin_unlock_irqrestore(&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; | |
e53e97ce | 967 | |
b67bfe0d | 968 | hlist_for_each_entry(lp, &ldc_channel_list, list) { |
e53e97ce DM |
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((unsigned long)q, order); | |
1010 | } | |
1011 | ||
0ae53ed1 SV |
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 | ||
e53e97ce DM |
1038 | /* XXX Make this configurable... XXX */ |
1039 | #define LDC_IOTABLE_SIZE (8 * 1024) | |
1040 | ||
0ae53ed1 | 1041 | static int ldc_iommu_init(const char *name, struct ldc_channel *lp) |
e53e97ce DM |
1042 | { |
1043 | unsigned long sz, num_tsb_entries, tsbsize, order; | |
0ae53ed1 SV |
1044 | struct ldc_iommu *ldc_iommu = &lp->iommu; |
1045 | struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; | |
e53e97ce DM |
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); | |
0ae53ed1 | 1052 | spin_lock_init(&ldc_iommu->lock); |
e53e97ce DM |
1053 | |
1054 | sz = num_tsb_entries / 8; | |
1055 | sz = (sz + 7UL) & ~7UL; | |
0ae53ed1 SV |
1056 | iommu->map = kzalloc(sz, GFP_KERNEL); |
1057 | if (!iommu->map) { | |
e53e97ce DM |
1058 | printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz); |
1059 | return -ENOMEM; | |
1060 | } | |
0ae53ed1 SV |
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 */); | |
e53e97ce DM |
1065 | |
1066 | order = get_order(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 | ||
0ae53ed1 | 1079 | ldc_iommu->page_table = table; |
e53e97ce DM |
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((unsigned long) table, order); | |
0ae53ed1 | 1091 | ldc_iommu->page_table = NULL; |
e53e97ce DM |
1092 | |
1093 | out_free_map: | |
0ae53ed1 SV |
1094 | kfree(iommu->map); |
1095 | iommu->map = NULL; | |
e53e97ce DM |
1096 | |
1097 | return err; | |
1098 | } | |
1099 | ||
1100 | static void ldc_iommu_release(struct ldc_channel *lp) | |
1101 | { | |
0ae53ed1 SV |
1102 | struct ldc_iommu *ldc_iommu = &lp->iommu; |
1103 | struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table; | |
e53e97ce DM |
1104 | unsigned long num_tsb_entries, tsbsize, order; |
1105 | ||
1106 | (void) sun4v_ldc_set_map_table(lp->id, 0, 0); | |
1107 | ||
0ae53ed1 | 1108 | num_tsb_entries = iommu->poolsize * iommu->nr_pools; |
e53e97ce DM |
1109 | tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry); |
1110 | order = get_order(tsbsize); | |
1111 | ||
0ae53ed1 SV |
1112 | free_pages((unsigned long) ldc_iommu->page_table, order); |
1113 | ldc_iommu->page_table = NULL; | |
e53e97ce | 1114 | |
0ae53ed1 SV |
1115 | kfree(iommu->map); |
1116 | iommu->map = NULL; | |
e53e97ce DM |
1117 | } |
1118 | ||
1119 | struct ldc_channel *ldc_alloc(unsigned long id, | |
1120 | const struct ldc_channel_config *cfgp, | |
c21c4ab0 SV |
1121 | void *event_arg, |
1122 | const char *name) | |
e53e97ce DM |
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; | |
c21c4ab0 SV |
1137 | if (!name) |
1138 | goto out_err; | |
e53e97ce DM |
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 | ||
e53e97ce DM |
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(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 | ||
0ae53ed1 | 1183 | err = ldc_iommu_init(name, lp); |
e53e97ce DM |
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(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("TX", lp->tx_num_entries, | |
1212 | &lp->tx_base, &lp->tx_ra); | |
1213 | if (err) | |
1214 | goto out_free_mssbuf; | |
1215 | ||
1216 | err = alloc_queue("RX", lp->rx_num_entries, | |
1217 | &lp->rx_base, &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(&lp->list); | |
1227 | hlist_add_head(&lp->list, &ldc_channel_list); | |
1228 | ||
1229 | INIT_HLIST_HEAD(&lp->mh_list); | |
1230 | ||
c21c4ab0 SV |
1231 | snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name); |
1232 | snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name); | |
1233 | ||
1234 | err = request_irq(lp->cfg.rx_irq, ldc_rx, 0, | |
1235 | lp->rx_irq_name, lp); | |
1236 | if (err) | |
1237 | goto out_free_txq; | |
1238 | ||
1239 | err = request_irq(lp->cfg.tx_irq, ldc_tx, 0, | |
1240 | lp->tx_irq_name, lp); | |
1241 | if (err) { | |
1242 | free_irq(lp->cfg.rx_irq, lp); | |
1243 | goto out_free_txq; | |
1244 | } | |
1245 | ||
e53e97ce DM |
1246 | return lp; |
1247 | ||
1248 | out_free_txq: | |
1249 | free_queue(lp->tx_num_entries, lp->tx_base); | |
1250 | ||
1251 | out_free_mssbuf: | |
ed247e12 | 1252 | kfree(mssbuf); |
e53e97ce DM |
1253 | |
1254 | out_free_iommu: | |
1255 | ldc_iommu_release(lp); | |
1256 | ||
1257 | out_free_ldc: | |
1258 | kfree(lp); | |
1259 | ||
1260 | out_err: | |
1261 | return ERR_PTR(err); | |
1262 | } | |
1263 | EXPORT_SYMBOL(ldc_alloc); | |
1264 | ||
1678c2bd | 1265 | void ldc_unbind(struct ldc_channel *lp) |
e53e97ce DM |
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); | |
1678c2bd | 1270 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
e53e97ce DM |
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(lp->tx_num_entries, lp->tx_base); | |
1280 | free_queue(lp->rx_num_entries, lp->rx_base); | |
1281 | lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES; | |
1282 | } | |
1283 | ||
1678c2bd DE |
1284 | ldc_set_state(lp, LDC_STATE_INIT); |
1285 | } | |
1286 | EXPORT_SYMBOL(ldc_unbind); | |
e53e97ce | 1287 | |
1678c2bd DE |
1288 | void ldc_free(struct ldc_channel *lp) |
1289 | { | |
1290 | ldc_unbind(lp); | |
1291 | hlist_del(&lp->list); | |
ed247e12 | 1292 | kfree(lp->mssbuf); |
e53e97ce DM |
1293 | ldc_iommu_release(lp); |
1294 | ||
1295 | kfree(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 | */ | |
c21c4ab0 | 1304 | int ldc_bind(struct ldc_channel *lp) |
e53e97ce DM |
1305 | { |
1306 | unsigned long hv_err, flags; | |
1307 | int err = -EINVAL; | |
1308 | ||
c21c4ab0 | 1309 | if (lp->state != LDC_STATE_INIT) |
b7c2a757 | 1310 | return -EINVAL; |
e53e97ce | 1311 | |
b7c2a757 DM |
1312 | spin_lock_irqsave(&lp->lock, flags); |
1313 | ||
1314 | enable_irq(lp->cfg.rx_irq); | |
1315 | enable_irq(lp->cfg.tx_irq); | |
e53e97ce DM |
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) | |
b7c2a757 | 1322 | goto out_free_irqs; |
e53e97ce DM |
1323 | |
1324 | hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries); | |
1325 | if (hv_err) | |
b7c2a757 | 1326 | goto out_free_irqs; |
e53e97ce DM |
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 | ||
01b7a471 JR |
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 | ||
e53e97ce DM |
1359 | spin_unlock_irqrestore(&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 | ||
b7c2a757 | 1370 | out_free_irqs: |
e53e97ce DM |
1371 | lp->flags &= ~LDC_FLAG_REGISTERED_IRQS; |
1372 | free_irq(lp->cfg.tx_irq, lp); | |
e53e97ce DM |
1373 | free_irq(lp->cfg.rx_irq, lp); |
1374 | ||
e53e97ce DM |
1375 | spin_unlock_irqrestore(&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) | |
4ec1b010 | 1394 | err = ((lp->hs_state > LDC_HS_OPEN) ? 0 : -EINVAL); |
e53e97ce DM |
1395 | else |
1396 | err = start_handshake(lp); | |
1397 | ||
1398 | spin_unlock_irqrestore(&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(&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(&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 | ||
85762a65 JR |
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 | } | |
01b7a471 | 1472 | EXPORT_SYMBOL(ldc_set_state); |
85762a65 JR |
1473 | |
1474 | int ldc_mode(struct ldc_channel *lp) | |
1475 | { | |
1476 | return lp->cfg.mode; | |
1477 | } | |
01b7a471 | 1478 | EXPORT_SYMBOL(ldc_mode); |
85762a65 JR |
1479 | |
1480 | int ldc_rx_reset(struct ldc_channel *lp) | |
1481 | { | |
1482 | return __set_rx_head(lp, lp->rx_tail); | |
1483 | } | |
f8c55335 | 1484 | EXPORT_SYMBOL(ldc_rx_reset); |
85762a65 JR |
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 | } | |
f283ebd5 | 1498 | EXPORT_SYMBOL(__ldc_print); |
85762a65 | 1499 | |
e53e97ce DM |
1500 | static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size) |
1501 | { | |
1502 | struct ldc_packet *p; | |
fc43b978 | 1503 | unsigned long new_tail, hv_err; |
e53e97ce DM |
1504 | int err; |
1505 | ||
fc43b978 JR |
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 | ||
e53e97ce DM |
1514 | if (size > LDC_PACKET_SIZE) |
1515 | return -EMSGSIZE; | |
1516 | ||
1517 | p = data_get_tx_packet(lp, &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) | |
29693e75 | 1544 | return LDC_ABORT(lp); |
e53e97ce DM |
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, lp->rx_head); | |
1557 | lp->rx_head = new; | |
1558 | ||
1559 | err = __set_rx_head(lp, 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)) | |
29693e75 | 1587 | return LDC_ABORT(lp); |
e53e97ce DM |
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, 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, p); | |
1650 | if (err) | |
1651 | return err; | |
1652 | ||
85762a65 | 1653 | err = ldc_rx_reset(lp); |
e53e97ce | 1654 | if (err < 0) |
29693e75 | 1655 | return LDC_ABORT(lp); |
e53e97ce DM |
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, p); | |
1664 | if (err) | |
1665 | return err; | |
1666 | } | |
1667 | if (p->stype & LDC_NACK) | |
29693e75 | 1668 | return LDC_ABORT(lp); |
e53e97ce DM |
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) | |
29693e75 | 1688 | return LDC_ABORT(lp); |
e53e97ce | 1689 | |
e53e97ce DM |
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) { | |
cb481235 DM |
1695 | ldcdbg(DATA, "DATA WAIT DONE " |
1696 | "head[%lx] tail[%lx] chan_state[%lx]\n", | |
1697 | dummy, lp->rx_tail, lp->chan_state); | |
e53e97ce DM |
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) | |
29693e75 | 1711 | return LDC_ABORT(lp); |
e53e97ce DM |
1712 | |
1713 | lp->rx_head = head; | |
1714 | return 0; | |
1715 | } | |
1716 | ||
cb481235 DM |
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); | |
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 | ||
e53e97ce DM |
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) | |
29693e75 | 1750 | return LDC_ABORT(lp); |
e53e97ce DM |
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 | ||
cb481235 | 1769 | ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] " |
e53e97ce DM |
1770 | "rcv_nxt[%08x]\n", |
1771 | p->type, | |
1772 | p->stype, | |
1773 | p->ctrl, | |
1774 | p->env, | |
1775 | p->seqid, | |
cb481235 | 1776 | p->u.r.ackid, |
e53e97ce DM |
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 | ||
6c95483b JR |
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 | */ | |
e53e97ce DM |
1799 | if (!(p->type & LDC_DATA)) { |
1800 | new = rx_advance(lp, new); | |
6c95483b | 1801 | break; |
e53e97ce DM |
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, new); | |
cb481235 DM |
1810 | err = rx_set_head(lp, new); |
1811 | if (err) | |
1812 | break; | |
e53e97ce DM |
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, new); | |
1835 | ||
1836 | err = rx_set_head(lp, 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 it's read buffer. | |
1858 | */ | |
1859 | err = -EMSGSIZE; | |
1860 | break; | |
1861 | } | |
1862 | ||
1863 | /* Ok, we are gonna eat this one. */ | |
1864 | new = rx_advance(lp, 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, new); | |
1878 | if (err) | |
1879 | break; | |
1880 | } | |
1881 | } | |
1882 | ||
1883 | if (!err) | |
1884 | err = rx_set_head(lp, new); | |
1885 | ||
1886 | if (err && first_frag) | |
1887 | lp->rcv_nxt = first_frag->seqid - 1; | |
1888 | ||
cb481235 | 1889 | if (!err) { |
e53e97ce | 1890 | err = copied; |
cb481235 DM |
1891 | if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE) |
1892 | send_data_ack(lp); | |
1893 | } | |
e53e97ce DM |
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) { | |
cb481235 | 1914 | int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu); |
e53e97ce DM |
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(&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 | ||
93ec4a82 JR |
1966 | ldcdbg(RX, "%s: entered size=%d\n", __func__, size); |
1967 | ||
e53e97ce DM |
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(&lp->lock, flags); | |
1982 | ||
93ec4a82 JR |
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 | ||
e53e97ce DM |
1986 | return err; |
1987 | } | |
1988 | EXPORT_SYMBOL(ldc_read); | |
1989 | ||
e53e97ce DM |
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 | ||
e53e97ce DM |
2016 | |
2017 | static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu, | |
2018 | unsigned long npages) | |
2019 | { | |
2020 | long entry; | |
2021 | ||
0ae53ed1 SV |
2022 | entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table, |
2023 | npages, NULL, (unsigned long)-1, 0); | |
d618382b | 2024 | if (unlikely(entry == IOMMU_ERROR_CODE)) |
e53e97ce DM |
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(sp->pte_idx, | |
2100 | pagesize_code(), 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 | { | |
58b053e4 | 2122 | unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT; |
e53e97ce DM |
2123 | long len = sg->length; |
2124 | ||
2125 | if ((sg->offset | len) & (8UL - 1)) | |
2126 | return -EFAULT; | |
2127 | ||
2128 | return pages_in_region(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 + 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 | { | |
0ae53ed1 | 2152 | unsigned long i, npages; |
e53e97ce DM |
2153 | struct ldc_mtable_entry *base; |
2154 | struct cookie_state state; | |
2155 | struct ldc_iommu *iommu; | |
2156 | int err; | |
8c07a308 | 2157 | struct scatterlist *s; |
e53e97ce DM |
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 | ||
e53e97ce | 2172 | base = alloc_npages(iommu, npages); |
e53e97ce DM |
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 | ||
8c07a308 AM |
2184 | for_each_sg(sg, s, num_sg, i) { |
2185 | fill_cookies(&state, page_to_pfn(sg_page(s)) << PAGE_SHIFT, | |
2186 | s->offset, s->length); | |
2187 | } | |
e53e97ce DM |
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 | { | |
0ae53ed1 | 2198 | unsigned long npages, pa; |
e53e97ce DM |
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(pa, len); | |
2211 | ||
2212 | iommu = &lp->iommu; | |
2213 | ||
e53e97ce | 2214 | base = alloc_npages(iommu, npages); |
e53e97ce DM |
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(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len); | |
42db672d | 2226 | BUG_ON(state.nc > ncookies); |
e53e97ce DM |
2227 | |
2228 | return state.nc; | |
2229 | } | |
2230 | EXPORT_SYMBOL(ldc_map_single); | |
2231 | ||
0ae53ed1 | 2232 | |
e53e97ce DM |
2233 | static void free_npages(unsigned long id, struct ldc_iommu *iommu, |
2234 | u64 cookie, u64 size) | |
2235 | { | |
0ae53ed1 | 2236 | unsigned long npages, entry; |
e53e97ce | 2237 | |
671d7732 | 2238 | npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT; |
c12f048f | 2239 | |
0ae53ed1 SV |
2240 | entry = ldc_cookie_to_index(cookie, iommu); |
2241 | ldc_demap(iommu, id, cookie, entry, npages); | |
2242 | iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry); | |
e53e97ce DM |
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; | |
c12f048f | 2249 | int i; |
0ae53ed1 | 2250 | unsigned long flags; |
e53e97ce DM |
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(lp->id, iommu, addr, size); | |
2258 | } | |
2259 | spin_unlock_irqrestore(&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(-EINVAL); | |
2362 | ||
0edfad59 | 2363 | buf = kzalloc(len, GFP_ATOMIC); |
e53e97ce DM |
2364 | if (!buf) |
2365 | return ERR_PTR(-ENOMEM); | |
2366 | ||
2367 | err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm); | |
2368 | if (err < 0) { | |
2369 | kfree(buf); | |
2370 | return ERR_PTR(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(buf); | |
2383 | } | |
2384 | EXPORT_SYMBOL(ldc_free_exp_dring); | |
2385 | ||
2386 | static int __init ldc_init(void) | |
2387 | { | |
e53e97ce | 2388 | unsigned long major, minor; |
43fdf274 | 2389 | struct mdesc_handle *hp; |
e53e97ce | 2390 | const u64 *v; |
6fab2600 | 2391 | int err; |
43fdf274 | 2392 | u64 mp; |
e53e97ce | 2393 | |
43fdf274 DM |
2394 | hp = mdesc_grab(); |
2395 | if (!hp) | |
e53e97ce DM |
2396 | return -ENODEV; |
2397 | ||
43fdf274 | 2398 | mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform"); |
6fab2600 | 2399 | err = -ENODEV; |
43fdf274 | 2400 | if (mp == MDESC_NODE_NULL) |
6fab2600 | 2401 | goto out; |
43fdf274 DM |
2402 | |
2403 | v = mdesc_get_property(hp, mp, "domaining-enabled", NULL); | |
e53e97ce | 2404 | if (!v) |
6fab2600 | 2405 | goto out; |
e53e97ce DM |
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"); | |
6fab2600 | 2411 | goto out; |
e53e97ce DM |
2412 | } |
2413 | ||
2414 | printk(KERN_INFO "%s", version); | |
2415 | ||
2416 | if (!*v) { | |
2417 | printk(KERN_INFO PFX "Domaining disabled.\n"); | |
6fab2600 | 2418 | goto out; |
e53e97ce DM |
2419 | } |
2420 | ldom_domaining_enabled = 1; | |
6fab2600 | 2421 | err = 0; |
e53e97ce | 2422 | |
6fab2600 DM |
2423 | out: |
2424 | mdesc_release(hp); | |
2425 | return err; | |
e53e97ce DM |
2426 | } |
2427 | ||
2428 | core_initcall(ldc_init); |