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Linux 4.13.16
[linux/fpc-iii.git] / arch / sparc / kernel / ldc.c
blob840e0b21bfe31addc817bcbbf6a8cb70d6f9f72f
1 /* ldc.c: Logical Domain Channel link-layer protocol driver.
2 *
3 * Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/export.h>
8 #include <linux/slab.h>
9 #include <linux/spinlock.h>
10 #include <linux/delay.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/scatterlist.h>
14 #include <linux/interrupt.h>
15 #include <linux/list.h>
16 #include <linux/init.h>
17 #include <linux/bitmap.h>
18 #include <linux/iommu-common.h>
19
20 #include <asm/hypervisor.h>
21 #include <asm/iommu.h>
22 #include <asm/page.h>
23 #include <asm/ldc.h>
24 #include <asm/mdesc.h>
25
26 #define DRV_MODULE_NAME "ldc"
27 #define PFX DRV_MODULE_NAME ": "
28 #define DRV_MODULE_VERSION "1.1"
29 #define DRV_MODULE_RELDATE "July 22, 2008"
30
31 #define COOKIE_PGSZ_CODE 0xf000000000000000ULL
32 #define COOKIE_PGSZ_CODE_SHIFT 60ULL
33
34
35 static char version[] =
36 DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
37
38 /* Packet header layout for unreliable and reliable mode frames.
39 * When in RAW mode, packets are simply straight 64-byte payloads
40 * with no headers.
41 */
42 struct ldc_packet {
43 u8 type;
44 #define LDC_CTRL 0x01
45 #define LDC_DATA 0x02
46 #define LDC_ERR 0x10
47
48 u8 stype;
49 #define LDC_INFO 0x01
50 #define LDC_ACK 0x02
51 #define LDC_NACK 0x04
52
53 u8 ctrl;
54 #define LDC_VERS 0x01 /* Link Version */
55 #define LDC_RTS 0x02 /* Request To Send */
56 #define LDC_RTR 0x03 /* Ready To Receive */
57 #define LDC_RDX 0x04 /* Ready for Data eXchange */
58 #define LDC_CTRL_MSK 0x0f
59
60 u8 env;
61 #define LDC_LEN 0x3f
62 #define LDC_FRAG_MASK 0xc0
63 #define LDC_START 0x40
64 #define LDC_STOP 0x80
65
66 u32 seqid;
67
68 union {
69 u8 u_data[LDC_PACKET_SIZE - 8];
70 struct {
71 u32 pad;
72 u32 ackid;
73 u8 r_data[LDC_PACKET_SIZE - 8 - 8];
74 } r;
75 } u;
76 };
77
78 struct ldc_version {
79 u16 major;
80 u16 minor;
81 };
82
83 /* Ordered from largest major to lowest. */
84 static struct ldc_version ver_arr[] = {
85 { .major = 1, .minor = 0 },
86 };
87
88 #define LDC_DEFAULT_MTU (4 * LDC_PACKET_SIZE)
89 #define LDC_DEFAULT_NUM_ENTRIES (PAGE_SIZE / LDC_PACKET_SIZE)
90
91 struct ldc_channel;
92
93 struct ldc_mode_ops {
94 int (*write)(struct ldc_channel *, const void *, unsigned int);
95 int (*read)(struct ldc_channel *, void *, unsigned int);
96 };
97
98 static const struct ldc_mode_ops raw_ops;
99 static const struct ldc_mode_ops nonraw_ops;
100 static const struct ldc_mode_ops stream_ops;
101
102 int ldom_domaining_enabled;
103
104 struct ldc_iommu {
105 /* Protects ldc_unmap. */
106 spinlock_t lock;
107 struct ldc_mtable_entry *page_table;
108 struct iommu_map_table iommu_map_table;
109 };
110
111 struct ldc_channel {
112 /* Protects all operations that depend upon channel state. */
113 spinlock_t lock;
114
115 unsigned long id;
116
117 u8 *mssbuf;
118 u32 mssbuf_len;
119 u32 mssbuf_off;
120
121 struct ldc_packet *tx_base;
122 unsigned long tx_head;
123 unsigned long tx_tail;
124 unsigned long tx_num_entries;
125 unsigned long tx_ra;
126
127 unsigned long tx_acked;
128
129 struct ldc_packet *rx_base;
130 unsigned long rx_head;
131 unsigned long rx_tail;
132 unsigned long rx_num_entries;
133 unsigned long rx_ra;
134
135 u32 rcv_nxt;
136 u32 snd_nxt;
137
138 unsigned long chan_state;
139
140 struct ldc_channel_config cfg;
141 void *event_arg;
142
143 const struct ldc_mode_ops *mops;
144
145 struct ldc_iommu iommu;
146
147 struct ldc_version ver;
148
149 u8 hs_state;
150 #define LDC_HS_CLOSED 0x00
151 #define LDC_HS_OPEN 0x01
152 #define LDC_HS_GOTVERS 0x02
153 #define LDC_HS_SENTRTR 0x03
154 #define LDC_HS_GOTRTR 0x04
155 #define LDC_HS_COMPLETE 0x10
156
157 u8 flags;
158 #define LDC_FLAG_ALLOCED_QUEUES 0x01
159 #define LDC_FLAG_REGISTERED_QUEUES 0x02
160 #define LDC_FLAG_REGISTERED_IRQS 0x04
161 #define LDC_FLAG_RESET 0x10
162
163 u8 mss;
164 u8 state;
165
166 #define LDC_IRQ_NAME_MAX 32
167 char rx_irq_name[LDC_IRQ_NAME_MAX];
168 char tx_irq_name[LDC_IRQ_NAME_MAX];
169
170 struct hlist_head mh_list;
171
172 struct hlist_node list;
173 };
174
175 #define ldcdbg(TYPE, f, a...) \
176 do { if (lp->cfg.debug & LDC_DEBUG_##TYPE) \
177 printk(KERN_INFO PFX "ID[%lu] " f, lp->id, ## a); \
178 } while (0)
179
180 #define LDC_ABORT(lp) ldc_abort((lp), __func__)
181
182 static const char *state_to_str(u8 state)
183 {
184 switch (state) {
185 case LDC_STATE_INVALID:
186 return "INVALID";
187 case LDC_STATE_INIT:
188 return "INIT";
189 case LDC_STATE_BOUND:
190 return "BOUND";
191 case LDC_STATE_READY:
192 return "READY";
193 case LDC_STATE_CONNECTED:
194 return "CONNECTED";
195 default:
196 return "<UNKNOWN>";
197 }
198 }
199
200 static unsigned long __advance(unsigned long off, unsigned long num_entries)
201 {
202 off += LDC_PACKET_SIZE;
203 if (off == (num_entries * LDC_PACKET_SIZE))
204 off = 0;
205
206 return off;
207 }
208
209 static unsigned long rx_advance(struct ldc_channel *lp, unsigned long off)
210 {
211 return __advance(off, lp->rx_num_entries);
212 }
213
214 static unsigned long tx_advance(struct ldc_channel *lp, unsigned long off)
215 {
216 return __advance(off, lp->tx_num_entries);
217 }
218
219 static struct ldc_packet *handshake_get_tx_packet(struct ldc_channel *lp,
220 unsigned long *new_tail)
221 {
222 struct ldc_packet *p;
223 unsigned long t;
224
225 t = tx_advance(lp, lp->tx_tail);
226 if (t == lp->tx_head)
227 return NULL;
228
229 *new_tail = t;
230
231 p = lp->tx_base;
232 return p + (lp->tx_tail / LDC_PACKET_SIZE);
233 }
234
235 /* When we are in reliable or stream mode, have to track the next packet
236 * we haven't gotten an ACK for in the TX queue using tx_acked. We have
237 * to be careful not to stomp over the queue past that point. During
238 * the handshake, we don't have TX data packets pending in the queue
239 * and that's why handshake_get_tx_packet() need not be mindful of
240 * lp->tx_acked.
241 */
242 static unsigned long head_for_data(struct ldc_channel *lp)
243 {
244 if (lp->cfg.mode == LDC_MODE_STREAM)
245 return lp->tx_acked;
246 return lp->tx_head;
247 }
248
249 static int tx_has_space_for(struct ldc_channel *lp, unsigned int size)
250 {
251 unsigned long limit, tail, new_tail, diff;
252 unsigned int mss;
253
254 limit = head_for_data(lp);
255 tail = lp->tx_tail;
256 new_tail = tx_advance(lp, tail);
257 if (new_tail == limit)
258 return 0;
259
260 if (limit > new_tail)
261 diff = limit - new_tail;
262 else
263 diff = (limit +
264 ((lp->tx_num_entries * LDC_PACKET_SIZE) - new_tail));
265 diff /= LDC_PACKET_SIZE;
266 mss = lp->mss;
267
268 if (diff * mss < size)
269 return 0;
270
271 return 1;
272 }
273
274 static struct ldc_packet *data_get_tx_packet(struct ldc_channel *lp,
275 unsigned long *new_tail)
276 {
277 struct ldc_packet *p;
278 unsigned long h, t;
279
280 h = head_for_data(lp);
281 t = tx_advance(lp, lp->tx_tail);
282 if (t == h)
283 return NULL;
284
285 *new_tail = t;
286
287 p = lp->tx_base;
288 return p + (lp->tx_tail / LDC_PACKET_SIZE);
289 }
290
291 static int set_tx_tail(struct ldc_channel *lp, unsigned long tail)
292 {
293 unsigned long orig_tail = lp->tx_tail;
294 int limit = 1000;
295
296 lp->tx_tail = tail;
297 while (limit-- > 0) {
298 unsigned long err;
299
300 err = sun4v_ldc_tx_set_qtail(lp->id, tail);
301 if (!err)
302 return 0;
303
304 if (err != HV_EWOULDBLOCK) {
305 lp->tx_tail = orig_tail;
306 return -EINVAL;
307 }
308 udelay(1);
309 }
310
311 lp->tx_tail = orig_tail;
312 return -EBUSY;
313 }
314
315 /* This just updates the head value in the hypervisor using
316 * a polling loop with a timeout. The caller takes care of
317 * upating software state representing the head change, if any.
318 */
319 static int __set_rx_head(struct ldc_channel *lp, unsigned long head)
320 {
321 int limit = 1000;
322
323 while (limit-- > 0) {
324 unsigned long err;
325
326 err = sun4v_ldc_rx_set_qhead(lp->id, head);
327 if (!err)
328 return 0;
329
330 if (err != HV_EWOULDBLOCK)
331 return -EINVAL;
332
333 udelay(1);
334 }
335
336 return -EBUSY;
337 }
338
339 static int send_tx_packet(struct ldc_channel *lp,
340 struct ldc_packet *p,
341 unsigned long new_tail)
342 {
343 BUG_ON(p != (lp->tx_base + (lp->tx_tail / LDC_PACKET_SIZE)));
344
345 return set_tx_tail(lp, new_tail);
346 }
347
348 static struct ldc_packet *handshake_compose_ctrl(struct ldc_channel *lp,
349 u8 stype, u8 ctrl,
350 void *data, int dlen,
351 unsigned long *new_tail)
352 {
353 struct ldc_packet *p = handshake_get_tx_packet(lp, new_tail);
354
355 if (p) {
356 memset(p, 0, sizeof(*p));
357 p->type = LDC_CTRL;
358 p->stype = stype;
359 p->ctrl = ctrl;
360 if (data)
361 memcpy(p->u.u_data, data, dlen);
362 }
363 return p;
364 }
365
366 static int start_handshake(struct ldc_channel *lp)
367 {
368 struct ldc_packet *p;
369 struct ldc_version *ver;
370 unsigned long new_tail;
371
372 ver = &ver_arr[0];
373
374 ldcdbg(HS, "SEND VER INFO maj[%u] min[%u]\n",
375 ver->major, ver->minor);
376
377 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
378 ver, sizeof(*ver), &new_tail);
379 if (p) {
380 int err = send_tx_packet(lp, p, new_tail);
381 if (!err)
382 lp->flags &= ~LDC_FLAG_RESET;
383 return err;
384 }
385 return -EBUSY;
386 }
387
388 static int send_version_nack(struct ldc_channel *lp,
389 u16 major, u16 minor)
390 {
391 struct ldc_packet *p;
392 struct ldc_version ver;
393 unsigned long new_tail;
394
395 ver.major = major;
396 ver.minor = minor;
397
398 p = handshake_compose_ctrl(lp, LDC_NACK, LDC_VERS,
399 &ver, sizeof(ver), &new_tail);
400 if (p) {
401 ldcdbg(HS, "SEND VER NACK maj[%u] min[%u]\n",
402 ver.major, ver.minor);
403
404 return send_tx_packet(lp, p, new_tail);
405 }
406 return -EBUSY;
407 }
408
409 static int send_version_ack(struct ldc_channel *lp,
410 struct ldc_version *vp)
411 {
412 struct ldc_packet *p;
413 unsigned long new_tail;
414
415 p = handshake_compose_ctrl(lp, LDC_ACK, LDC_VERS,
416 vp, sizeof(*vp), &new_tail);
417 if (p) {
418 ldcdbg(HS, "SEND VER ACK maj[%u] min[%u]\n",
419 vp->major, vp->minor);
420
421 return send_tx_packet(lp, p, new_tail);
422 }
423 return -EBUSY;
424 }
425
426 static int send_rts(struct ldc_channel *lp)
427 {
428 struct ldc_packet *p;
429 unsigned long new_tail;
430
431 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTS, NULL, 0,
432 &new_tail);
433 if (p) {
434 p->env = lp->cfg.mode;
435 p->seqid = 0;
436 lp->rcv_nxt = 0;
437
438 ldcdbg(HS, "SEND RTS env[0x%x] seqid[0x%x]\n",
439 p->env, p->seqid);
440
441 return send_tx_packet(lp, p, new_tail);
442 }
443 return -EBUSY;
444 }
445
446 static int send_rtr(struct ldc_channel *lp)
447 {
448 struct ldc_packet *p;
449 unsigned long new_tail;
450
451 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RTR, NULL, 0,
452 &new_tail);
453 if (p) {
454 p->env = lp->cfg.mode;
455 p->seqid = 0;
456
457 ldcdbg(HS, "SEND RTR env[0x%x] seqid[0x%x]\n",
458 p->env, p->seqid);
459
460 return send_tx_packet(lp, p, new_tail);
461 }
462 return -EBUSY;
463 }
464
465 static int send_rdx(struct ldc_channel *lp)
466 {
467 struct ldc_packet *p;
468 unsigned long new_tail;
469
470 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_RDX, NULL, 0,
471 &new_tail);
472 if (p) {
473 p->env = 0;
474 p->seqid = ++lp->snd_nxt;
475 p->u.r.ackid = lp->rcv_nxt;
476
477 ldcdbg(HS, "SEND RDX env[0x%x] seqid[0x%x] ackid[0x%x]\n",
478 p->env, p->seqid, p->u.r.ackid);
479
480 return send_tx_packet(lp, p, new_tail);
481 }
482 return -EBUSY;
483 }
484
485 static int send_data_nack(struct ldc_channel *lp, struct ldc_packet *data_pkt)
486 {
487 struct ldc_packet *p;
488 unsigned long new_tail;
489 int err;
490
491 p = data_get_tx_packet(lp, &new_tail);
492 if (!p)
493 return -EBUSY;
494 memset(p, 0, sizeof(*p));
495 p->type = data_pkt->type;
496 p->stype = LDC_NACK;
497 p->ctrl = data_pkt->ctrl & LDC_CTRL_MSK;
498 p->seqid = lp->snd_nxt + 1;
499 p->u.r.ackid = lp->rcv_nxt;
500
501 ldcdbg(HS, "SEND DATA NACK type[0x%x] ctl[0x%x] seq[0x%x] ack[0x%x]\n",
502 p->type, p->ctrl, p->seqid, p->u.r.ackid);
503
504 err = send_tx_packet(lp, p, new_tail);
505 if (!err)
506 lp->snd_nxt++;
507
508 return err;
509 }
510
511 static int ldc_abort(struct ldc_channel *lp, const char *msg)
512 {
513 unsigned long hv_err;
514
515 ldcdbg(STATE, "ABORT[%s]\n", msg);
516 ldc_print(lp);
517
518 /* We report but do not act upon the hypervisor errors because
519 * there really isn't much we can do if they fail at this point.
520 */
521 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
522 if (hv_err)
523 printk(KERN_ERR PFX "ldc_abort: "
524 "sun4v_ldc_tx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
525 lp->id, lp->tx_ra, lp->tx_num_entries, hv_err);
526
527 hv_err = sun4v_ldc_tx_get_state(lp->id,
528 &lp->tx_head,
529 &lp->tx_tail,
530 &lp->chan_state);
531 if (hv_err)
532 printk(KERN_ERR PFX "ldc_abort: "
533 "sun4v_ldc_tx_get_state(%lx,...) failed, err=%lu\n",
534 lp->id, hv_err);
535
536 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
537 if (hv_err)
538 printk(KERN_ERR PFX "ldc_abort: "
539 "sun4v_ldc_rx_qconf(%lx,%lx,%lx) failed, err=%lu\n",
540 lp->id, lp->rx_ra, lp->rx_num_entries, hv_err);
541
542 /* Refetch the RX queue state as well, because we could be invoked
543 * here in the queue processing context.
544 */
545 hv_err = sun4v_ldc_rx_get_state(lp->id,
546 &lp->rx_head,
547 &lp->rx_tail,
548 &lp->chan_state);
549 if (hv_err)
550 printk(KERN_ERR PFX "ldc_abort: "
551 "sun4v_ldc_rx_get_state(%lx,...) failed, err=%lu\n",
552 lp->id, hv_err);
553
554 return -ECONNRESET;
555 }
556
557 static struct ldc_version *find_by_major(u16 major)
558 {
559 struct ldc_version *ret = NULL;
560 int i;
561
562 for (i = 0; i < ARRAY_SIZE(ver_arr); i++) {
563 struct ldc_version *v = &ver_arr[i];
564 if (v->major <= major) {
565 ret = v;
566 break;
567 }
568 }
569 return ret;
570 }
571
572 static int process_ver_info(struct ldc_channel *lp, struct ldc_version *vp)
573 {
574 struct ldc_version *vap;
575 int err;
576
577 ldcdbg(HS, "GOT VERSION INFO major[%x] minor[%x]\n",
578 vp->major, vp->minor);
579
580 if (lp->hs_state == LDC_HS_GOTVERS) {
581 lp->hs_state = LDC_HS_OPEN;
582 memset(&lp->ver, 0, sizeof(lp->ver));
583 }
584
585 vap = find_by_major(vp->major);
586 if (!vap) {
587 err = send_version_nack(lp, 0, 0);
588 } else if (vap->major != vp->major) {
589 err = send_version_nack(lp, vap->major, vap->minor);
590 } else {
591 struct ldc_version ver = *vp;
592 if (ver.minor > vap->minor)
593 ver.minor = vap->minor;
594 err = send_version_ack(lp, &ver);
595 if (!err) {
596 lp->ver = ver;
597 lp->hs_state = LDC_HS_GOTVERS;
598 }
599 }
600 if (err)
601 return LDC_ABORT(lp);
602
603 return 0;
604 }
605
606 static int process_ver_ack(struct ldc_channel *lp, struct ldc_version *vp)
607 {
608 ldcdbg(HS, "GOT VERSION ACK major[%x] minor[%x]\n",
609 vp->major, vp->minor);
610
611 if (lp->hs_state == LDC_HS_GOTVERS) {
612 if (lp->ver.major != vp->major ||
613 lp->ver.minor != vp->minor)
614 return LDC_ABORT(lp);
615 } else {
616 lp->ver = *vp;
617 lp->hs_state = LDC_HS_GOTVERS;
618 }
619 if (send_rts(lp))
620 return LDC_ABORT(lp);
621 return 0;
622 }
623
624 static int process_ver_nack(struct ldc_channel *lp, struct ldc_version *vp)
625 {
626 struct ldc_version *vap;
627 struct ldc_packet *p;
628 unsigned long new_tail;
629
630 if (vp->major == 0 && vp->minor == 0)
631 return LDC_ABORT(lp);
632
633 vap = find_by_major(vp->major);
634 if (!vap)
635 return LDC_ABORT(lp);
636
637 p = handshake_compose_ctrl(lp, LDC_INFO, LDC_VERS,
638 vap, sizeof(*vap),
639 &new_tail);
640 if (!p)
641 return LDC_ABORT(lp);
642
643 return send_tx_packet(lp, p, new_tail);
644 }
645
646 static int process_version(struct ldc_channel *lp,
647 struct ldc_packet *p)
648 {
649 struct ldc_version *vp;
650
651 vp = (struct ldc_version *) p->u.u_data;
652
653 switch (p->stype) {
654 case LDC_INFO:
655 return process_ver_info(lp, vp);
656
657 case LDC_ACK:
658 return process_ver_ack(lp, vp);
659
660 case LDC_NACK:
661 return process_ver_nack(lp, vp);
662
663 default:
664 return LDC_ABORT(lp);
665 }
666 }
667
668 static int process_rts(struct ldc_channel *lp,
669 struct ldc_packet *p)
670 {
671 ldcdbg(HS, "GOT RTS stype[%x] seqid[%x] env[%x]\n",
672 p->stype, p->seqid, p->env);
673
674 if (p->stype != LDC_INFO ||
675 lp->hs_state != LDC_HS_GOTVERS ||
676 p->env != lp->cfg.mode)
677 return LDC_ABORT(lp);
678
679 lp->snd_nxt = p->seqid;
680 lp->rcv_nxt = p->seqid;
681 lp->hs_state = LDC_HS_SENTRTR;
682 if (send_rtr(lp))
683 return LDC_ABORT(lp);
684
685 return 0;
686 }
687
688 static int process_rtr(struct ldc_channel *lp,
689 struct ldc_packet *p)
690 {
691 ldcdbg(HS, "GOT RTR stype[%x] seqid[%x] env[%x]\n",
692 p->stype, p->seqid, p->env);
693
694 if (p->stype != LDC_INFO ||
695 p->env != lp->cfg.mode)
696 return LDC_ABORT(lp);
697
698 lp->snd_nxt = p->seqid;
699 lp->hs_state = LDC_HS_COMPLETE;
700 ldc_set_state(lp, LDC_STATE_CONNECTED);
701 send_rdx(lp);
702
703 return LDC_EVENT_UP;
704 }
705
706 static int rx_seq_ok(struct ldc_channel *lp, u32 seqid)
707 {
708 return lp->rcv_nxt + 1 == seqid;
709 }
710
711 static int process_rdx(struct ldc_channel *lp,
712 struct ldc_packet *p)
713 {
714 ldcdbg(HS, "GOT RDX stype[%x] seqid[%x] env[%x] ackid[%x]\n",
715 p->stype, p->seqid, p->env, p->u.r.ackid);
716
717 if (p->stype != LDC_INFO ||
718 !(rx_seq_ok(lp, p->seqid)))
719 return LDC_ABORT(lp);
720
721 lp->rcv_nxt = p->seqid;
722
723 lp->hs_state = LDC_HS_COMPLETE;
724 ldc_set_state(lp, LDC_STATE_CONNECTED);
725
726 return LDC_EVENT_UP;
727 }
728
729 static int process_control_frame(struct ldc_channel *lp,
730 struct ldc_packet *p)
731 {
732 switch (p->ctrl) {
733 case LDC_VERS:
734 return process_version(lp, p);
735
736 case LDC_RTS:
737 return process_rts(lp, p);
738
739 case LDC_RTR:
740 return process_rtr(lp, p);
741
742 case LDC_RDX:
743 return process_rdx(lp, p);
744
745 default:
746 return LDC_ABORT(lp);
747 }
748 }
749
750 static int process_error_frame(struct ldc_channel *lp,
751 struct ldc_packet *p)
752 {
753 return LDC_ABORT(lp);
754 }
755
756 static int process_data_ack(struct ldc_channel *lp,
757 struct ldc_packet *ack)
758 {
759 unsigned long head = lp->tx_acked;
760 u32 ackid = ack->u.r.ackid;
761
762 while (1) {
763 struct ldc_packet *p = lp->tx_base + (head / LDC_PACKET_SIZE);
764
765 head = tx_advance(lp, head);
766
767 if (p->seqid == ackid) {
768 lp->tx_acked = head;
769 return 0;
770 }
771 if (head == lp->tx_tail)
772 return LDC_ABORT(lp);
773 }
774
775 return 0;
776 }
777
778 static void send_events(struct ldc_channel *lp, unsigned int event_mask)
779 {
780 if (event_mask & LDC_EVENT_RESET)
781 lp->cfg.event(lp->event_arg, LDC_EVENT_RESET);
782 if (event_mask & LDC_EVENT_UP)
783 lp->cfg.event(lp->event_arg, LDC_EVENT_UP);
784 if (event_mask & LDC_EVENT_DATA_READY)
785 lp->cfg.event(lp->event_arg, LDC_EVENT_DATA_READY);
786 }
787
788 static irqreturn_t ldc_rx(int irq, void *dev_id)
789 {
790 struct ldc_channel *lp = dev_id;
791 unsigned long orig_state, flags;
792 unsigned int event_mask;
793
794 spin_lock_irqsave(&lp->lock, flags);
795
796 orig_state = lp->chan_state;
797
798 /* We should probably check for hypervisor errors here and
799 * reset the LDC channel if we get one.
800 */
801 sun4v_ldc_rx_get_state(lp->id,
802 &lp->rx_head,
803 &lp->rx_tail,
804 &lp->chan_state);
805
806 ldcdbg(RX, "RX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
807 orig_state, lp->chan_state, lp->rx_head, lp->rx_tail);
808
809 event_mask = 0;
810
811 if (lp->cfg.mode == LDC_MODE_RAW &&
812 lp->chan_state == LDC_CHANNEL_UP) {
813 lp->hs_state = LDC_HS_COMPLETE;
814 ldc_set_state(lp, LDC_STATE_CONNECTED);
815
816 /*
817 * Generate an LDC_EVENT_UP event if the channel
818 * was not already up.
819 */
820 if (orig_state != LDC_CHANNEL_UP) {
821 event_mask |= LDC_EVENT_UP;
822 orig_state = lp->chan_state;
823 }
824 }
825
826 /* If we are in reset state, flush the RX queue and ignore
827 * everything.
828 */
829 if (lp->flags & LDC_FLAG_RESET) {
830 (void) ldc_rx_reset(lp);
831 goto out;
832 }
833
834 /* Once we finish the handshake, we let the ldc_read()
835 * paths do all of the control frame and state management.
836 * Just trigger the callback.
837 */
838 if (lp->hs_state == LDC_HS_COMPLETE) {
839 handshake_complete:
840 if (lp->chan_state != orig_state) {
841 unsigned int event = LDC_EVENT_RESET;
842
843 if (lp->chan_state == LDC_CHANNEL_UP)
844 event = LDC_EVENT_UP;
845
846 event_mask |= event;
847 }
848 if (lp->rx_head != lp->rx_tail)
849 event_mask |= LDC_EVENT_DATA_READY;
850
851 goto out;
852 }
853
854 if (lp->chan_state != orig_state)
855 goto out;
856
857 while (lp->rx_head != lp->rx_tail) {
858 struct ldc_packet *p;
859 unsigned long new;
860 int err;
861
862 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
863
864 switch (p->type) {
865 case LDC_CTRL:
866 err = process_control_frame(lp, p);
867 if (err > 0)
868 event_mask |= err;
869 break;
870
871 case LDC_DATA:
872 event_mask |= LDC_EVENT_DATA_READY;
873 err = 0;
874 break;
875
876 case LDC_ERR:
877 err = process_error_frame(lp, p);
878 break;
879
880 default:
881 err = LDC_ABORT(lp);
882 break;
883 }
884
885 if (err < 0)
886 break;
887
888 new = lp->rx_head;
889 new += LDC_PACKET_SIZE;
890 if (new == (lp->rx_num_entries * LDC_PACKET_SIZE))
891 new = 0;
892 lp->rx_head = new;
893
894 err = __set_rx_head(lp, new);
895 if (err < 0) {
896 (void) LDC_ABORT(lp);
897 break;
898 }
899 if (lp->hs_state == LDC_HS_COMPLETE)
900 goto handshake_complete;
901 }
902
903 out:
904 spin_unlock_irqrestore(&lp->lock, flags);
905
906 send_events(lp, event_mask);
907
908 return IRQ_HANDLED;
909 }
910
911 static irqreturn_t ldc_tx(int irq, void *dev_id)
912 {
913 struct ldc_channel *lp = dev_id;
914 unsigned long flags, orig_state;
915 unsigned int event_mask = 0;
916
917 spin_lock_irqsave(&lp->lock, flags);
918
919 orig_state = lp->chan_state;
920
921 /* We should probably check for hypervisor errors here and
922 * reset the LDC channel if we get one.
923 */
924 sun4v_ldc_tx_get_state(lp->id,
925 &lp->tx_head,
926 &lp->tx_tail,
927 &lp->chan_state);
928
929 ldcdbg(TX, " TX state[0x%02lx:0x%02lx] head[0x%04lx] tail[0x%04lx]\n",
930 orig_state, lp->chan_state, lp->tx_head, lp->tx_tail);
931
932 if (lp->cfg.mode == LDC_MODE_RAW &&
933 lp->chan_state == LDC_CHANNEL_UP) {
934 lp->hs_state = LDC_HS_COMPLETE;
935 ldc_set_state(lp, LDC_STATE_CONNECTED);
936
937 /*
938 * Generate an LDC_EVENT_UP event if the channel
939 * was not already up.
940 */
941 if (orig_state != LDC_CHANNEL_UP) {
942 event_mask |= LDC_EVENT_UP;
943 orig_state = lp->chan_state;
944 }
945 }
946
947 spin_unlock_irqrestore(&lp->lock, flags);
948
949 send_events(lp, event_mask);
950
951 return IRQ_HANDLED;
952 }
953
954 /* XXX ldc_alloc() and ldc_free() needs to run under a mutex so
955 * XXX that addition and removal from the ldc_channel_list has
956 * XXX atomicity, otherwise the __ldc_channel_exists() check is
957 * XXX totally pointless as another thread can slip into ldc_alloc()
958 * XXX and add a channel with the same ID. There also needs to be
959 * XXX a spinlock for ldc_channel_list.
960 */
961 static HLIST_HEAD(ldc_channel_list);
962
963 static int __ldc_channel_exists(unsigned long id)
964 {
965 struct ldc_channel *lp;
966
967 hlist_for_each_entry(lp, &ldc_channel_list, list) {
968 if (lp->id == id)
969 return 1;
970 }
971 return 0;
972 }
973
974 static int alloc_queue(const char *name, unsigned long num_entries,
975 struct ldc_packet **base, unsigned long *ra)
976 {
977 unsigned long size, order;
978 void *q;
979
980 size = num_entries * LDC_PACKET_SIZE;
981 order = get_order(size);
982
983 q = (void *) __get_free_pages(GFP_KERNEL, order);
984 if (!q) {
985 printk(KERN_ERR PFX "Alloc of %s queue failed with "
986 "size=%lu order=%lu\n", name, size, order);
987 return -ENOMEM;
988 }
989
990 memset(q, 0, PAGE_SIZE << order);
991
992 *base = q;
993 *ra = __pa(q);
994
995 return 0;
996 }
997
998 static void free_queue(unsigned long num_entries, struct ldc_packet *q)
999 {
1000 unsigned long size, order;
1001
1002 if (!q)
1003 return;
1004
1005 size = num_entries * LDC_PACKET_SIZE;
1006 order = get_order(size);
1007
1008 free_pages((unsigned long)q, order);
1009 }
1010
1011 static unsigned long ldc_cookie_to_index(u64 cookie, void *arg)
1012 {
1013 u64 szcode = cookie >> COOKIE_PGSZ_CODE_SHIFT;
1014 /* struct ldc_iommu *ldc_iommu = (struct ldc_iommu *)arg; */
1015
1016 cookie &= ~COOKIE_PGSZ_CODE;
1017
1018 return (cookie >> (13ULL + (szcode * 3ULL)));
1019 }
1020
1021 static void ldc_demap(struct ldc_iommu *iommu, unsigned long id, u64 cookie,
1022 unsigned long entry, unsigned long npages)
1023 {
1024 struct ldc_mtable_entry *base;
1025 unsigned long i, shift;
1026
1027 shift = (cookie >> COOKIE_PGSZ_CODE_SHIFT) * 3;
1028 base = iommu->page_table + entry;
1029 for (i = 0; i < npages; i++) {
1030 if (base->cookie)
1031 sun4v_ldc_revoke(id, cookie + (i << shift),
1032 base->cookie);
1033 base->mte = 0;
1034 }
1035 }
1036
1037 /* XXX Make this configurable... XXX */
1038 #define LDC_IOTABLE_SIZE (8 * 1024)
1039
1040 static int ldc_iommu_init(const char *name, struct ldc_channel *lp)
1041 {
1042 unsigned long sz, num_tsb_entries, tsbsize, order;
1043 struct ldc_iommu *ldc_iommu = &lp->iommu;
1044 struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table;
1045 struct ldc_mtable_entry *table;
1046 unsigned long hv_err;
1047 int err;
1048
1049 num_tsb_entries = LDC_IOTABLE_SIZE;
1050 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
1051 spin_lock_init(&ldc_iommu->lock);
1052
1053 sz = num_tsb_entries / 8;
1054 sz = (sz + 7UL) & ~7UL;
1055 iommu->map = kzalloc(sz, GFP_KERNEL);
1056 if (!iommu->map) {
1057 printk(KERN_ERR PFX "Alloc of arena map failed, sz=%lu\n", sz);
1058 return -ENOMEM;
1059 }
1060 iommu_tbl_pool_init(iommu, num_tsb_entries, PAGE_SHIFT,
1061 NULL, false /* no large pool */,
1062 1 /* npools */,
1063 true /* skip span boundary check */);
1064
1065 order = get_order(tsbsize);
1066
1067 table = (struct ldc_mtable_entry *)
1068 __get_free_pages(GFP_KERNEL, order);
1069 err = -ENOMEM;
1070 if (!table) {
1071 printk(KERN_ERR PFX "Alloc of MTE table failed, "
1072 "size=%lu order=%lu\n", tsbsize, order);
1073 goto out_free_map;
1074 }
1075
1076 memset(table, 0, PAGE_SIZE << order);
1077
1078 ldc_iommu->page_table = table;
1079
1080 hv_err = sun4v_ldc_set_map_table(lp->id, __pa(table),
1081 num_tsb_entries);
1082 err = -EINVAL;
1083 if (hv_err)
1084 goto out_free_table;
1085
1086 return 0;
1087
1088 out_free_table:
1089 free_pages((unsigned long) table, order);
1090 ldc_iommu->page_table = NULL;
1091
1092 out_free_map:
1093 kfree(iommu->map);
1094 iommu->map = NULL;
1095
1096 return err;
1097 }
1098
1099 static void ldc_iommu_release(struct ldc_channel *lp)
1100 {
1101 struct ldc_iommu *ldc_iommu = &lp->iommu;
1102 struct iommu_map_table *iommu = &ldc_iommu->iommu_map_table;
1103 unsigned long num_tsb_entries, tsbsize, order;
1104
1105 (void) sun4v_ldc_set_map_table(lp->id, 0, 0);
1106
1107 num_tsb_entries = iommu->poolsize * iommu->nr_pools;
1108 tsbsize = num_tsb_entries * sizeof(struct ldc_mtable_entry);
1109 order = get_order(tsbsize);
1110
1111 free_pages((unsigned long) ldc_iommu->page_table, order);
1112 ldc_iommu->page_table = NULL;
1113
1114 kfree(iommu->map);
1115 iommu->map = NULL;
1116 }
1117
1118 struct ldc_channel *ldc_alloc(unsigned long id,
1119 const struct ldc_channel_config *cfgp,
1120 void *event_arg,
1121 const char *name)
1122 {
1123 struct ldc_channel *lp;
1124 const struct ldc_mode_ops *mops;
1125 unsigned long dummy1, dummy2, hv_err;
1126 u8 mss, *mssbuf;
1127 int err;
1128
1129 err = -ENODEV;
1130 if (!ldom_domaining_enabled)
1131 goto out_err;
1132
1133 err = -EINVAL;
1134 if (!cfgp)
1135 goto out_err;
1136 if (!name)
1137 goto out_err;
1138
1139 switch (cfgp->mode) {
1140 case LDC_MODE_RAW:
1141 mops = &raw_ops;
1142 mss = LDC_PACKET_SIZE;
1143 break;
1144
1145 case LDC_MODE_UNRELIABLE:
1146 mops = &nonraw_ops;
1147 mss = LDC_PACKET_SIZE - 8;
1148 break;
1149
1150 case LDC_MODE_STREAM:
1151 mops = &stream_ops;
1152 mss = LDC_PACKET_SIZE - 8 - 8;
1153 break;
1154
1155 default:
1156 goto out_err;
1157 }
1158
1159 if (!cfgp->event || !event_arg || !cfgp->rx_irq || !cfgp->tx_irq)
1160 goto out_err;
1161
1162 hv_err = sun4v_ldc_tx_qinfo(id, &dummy1, &dummy2);
1163 err = -ENODEV;
1164 if (hv_err == HV_ECHANNEL)
1165 goto out_err;
1166
1167 err = -EEXIST;
1168 if (__ldc_channel_exists(id))
1169 goto out_err;
1170
1171 mssbuf = NULL;
1172
1173 lp = kzalloc(sizeof(*lp), GFP_KERNEL);
1174 err = -ENOMEM;
1175 if (!lp)
1176 goto out_err;
1177
1178 spin_lock_init(&lp->lock);
1179
1180 lp->id = id;
1181
1182 err = ldc_iommu_init(name, lp);
1183 if (err)
1184 goto out_free_ldc;
1185
1186 lp->mops = mops;
1187 lp->mss = mss;
1188
1189 lp->cfg = *cfgp;
1190 if (!lp->cfg.mtu)
1191 lp->cfg.mtu = LDC_DEFAULT_MTU;
1192
1193 if (lp->cfg.mode == LDC_MODE_STREAM) {
1194 mssbuf = kzalloc(lp->cfg.mtu, GFP_KERNEL);
1195 if (!mssbuf) {
1196 err = -ENOMEM;
1197 goto out_free_iommu;
1198 }
1199 lp->mssbuf = mssbuf;
1200 }
1201
1202 lp->event_arg = event_arg;
1203
1204 /* XXX allow setting via ldc_channel_config to override defaults
1205 * XXX or use some formula based upon mtu
1206 */
1207 lp->tx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
1208 lp->rx_num_entries = LDC_DEFAULT_NUM_ENTRIES;
1209
1210 err = alloc_queue("TX", lp->tx_num_entries,
1211 &lp->tx_base, &lp->tx_ra);
1212 if (err)
1213 goto out_free_mssbuf;
1214
1215 err = alloc_queue("RX", lp->rx_num_entries,
1216 &lp->rx_base, &lp->rx_ra);
1217 if (err)
1218 goto out_free_txq;
1219
1220 lp->flags |= LDC_FLAG_ALLOCED_QUEUES;
1221
1222 lp->hs_state = LDC_HS_CLOSED;
1223 ldc_set_state(lp, LDC_STATE_INIT);
1224
1225 INIT_HLIST_NODE(&lp->list);
1226 hlist_add_head(&lp->list, &ldc_channel_list);
1227
1228 INIT_HLIST_HEAD(&lp->mh_list);
1229
1230 snprintf(lp->rx_irq_name, LDC_IRQ_NAME_MAX, "%s RX", name);
1231 snprintf(lp->tx_irq_name, LDC_IRQ_NAME_MAX, "%s TX", name);
1232
1233 err = request_irq(lp->cfg.rx_irq, ldc_rx, 0,
1234 lp->rx_irq_name, lp);
1235 if (err)
1236 goto out_free_txq;
1237
1238 err = request_irq(lp->cfg.tx_irq, ldc_tx, 0,
1239 lp->tx_irq_name, lp);
1240 if (err) {
1241 free_irq(lp->cfg.rx_irq, lp);
1242 goto out_free_txq;
1243 }
1244
1245 return lp;
1246
1247 out_free_txq:
1248 free_queue(lp->tx_num_entries, lp->tx_base);
1249
1250 out_free_mssbuf:
1251 kfree(mssbuf);
1252
1253 out_free_iommu:
1254 ldc_iommu_release(lp);
1255
1256 out_free_ldc:
1257 kfree(lp);
1258
1259 out_err:
1260 return ERR_PTR(err);
1261 }
1262 EXPORT_SYMBOL(ldc_alloc);
1263
1264 void ldc_unbind(struct ldc_channel *lp)
1265 {
1266 if (lp->flags & LDC_FLAG_REGISTERED_IRQS) {
1267 free_irq(lp->cfg.rx_irq, lp);
1268 free_irq(lp->cfg.tx_irq, lp);
1269 lp->flags &= ~LDC_FLAG_REGISTERED_IRQS;
1270 }
1271
1272 if (lp->flags & LDC_FLAG_REGISTERED_QUEUES) {
1273 sun4v_ldc_tx_qconf(lp->id, 0, 0);
1274 sun4v_ldc_rx_qconf(lp->id, 0, 0);
1275 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
1276 }
1277 if (lp->flags & LDC_FLAG_ALLOCED_QUEUES) {
1278 free_queue(lp->tx_num_entries, lp->tx_base);
1279 free_queue(lp->rx_num_entries, lp->rx_base);
1280 lp->flags &= ~LDC_FLAG_ALLOCED_QUEUES;
1281 }
1282
1283 ldc_set_state(lp, LDC_STATE_INIT);
1284 }
1285 EXPORT_SYMBOL(ldc_unbind);
1286
1287 void ldc_free(struct ldc_channel *lp)
1288 {
1289 ldc_unbind(lp);
1290 hlist_del(&lp->list);
1291 kfree(lp->mssbuf);
1292 ldc_iommu_release(lp);
1293
1294 kfree(lp);
1295 }
1296 EXPORT_SYMBOL(ldc_free);
1297
1298 /* Bind the channel. This registers the LDC queues with
1299 * the hypervisor and puts the channel into a pseudo-listening
1300 * state. This does not initiate a handshake, ldc_connect() does
1301 * that.
1302 */
1303 int ldc_bind(struct ldc_channel *lp)
1304 {
1305 unsigned long hv_err, flags;
1306 int err = -EINVAL;
1307
1308 if (lp->state != LDC_STATE_INIT)
1309 return -EINVAL;
1310
1311 spin_lock_irqsave(&lp->lock, flags);
1312
1313 enable_irq(lp->cfg.rx_irq);
1314 enable_irq(lp->cfg.tx_irq);
1315
1316 lp->flags |= LDC_FLAG_REGISTERED_IRQS;
1317
1318 err = -ENODEV;
1319 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
1320 if (hv_err)
1321 goto out_free_irqs;
1322
1323 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
1324 if (hv_err)
1325 goto out_free_irqs;
1326
1327 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
1328 if (hv_err)
1329 goto out_unmap_tx;
1330
1331 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
1332 if (hv_err)
1333 goto out_unmap_tx;
1334
1335 lp->flags |= LDC_FLAG_REGISTERED_QUEUES;
1336
1337 hv_err = sun4v_ldc_tx_get_state(lp->id,
1338 &lp->tx_head,
1339 &lp->tx_tail,
1340 &lp->chan_state);
1341 err = -EBUSY;
1342 if (hv_err)
1343 goto out_unmap_rx;
1344
1345 lp->tx_acked = lp->tx_head;
1346
1347 lp->hs_state = LDC_HS_OPEN;
1348 ldc_set_state(lp, LDC_STATE_BOUND);
1349
1350 if (lp->cfg.mode == LDC_MODE_RAW) {
1351 /*
1352 * There is no handshake in RAW mode, so handshake
1353 * is completed.
1354 */
1355 lp->hs_state = LDC_HS_COMPLETE;
1356 }
1357
1358 spin_unlock_irqrestore(&lp->lock, flags);
1359
1360 return 0;
1361
1362 out_unmap_rx:
1363 lp->flags &= ~LDC_FLAG_REGISTERED_QUEUES;
1364 sun4v_ldc_rx_qconf(lp->id, 0, 0);
1365
1366 out_unmap_tx:
1367 sun4v_ldc_tx_qconf(lp->id, 0, 0);
1368
1369 out_free_irqs:
1370 lp->flags &= ~LDC_FLAG_REGISTERED_IRQS;
1371 free_irq(lp->cfg.tx_irq, lp);
1372 free_irq(lp->cfg.rx_irq, lp);
1373
1374 spin_unlock_irqrestore(&lp->lock, flags);
1375
1376 return err;
1377 }
1378 EXPORT_SYMBOL(ldc_bind);
1379
1380 int ldc_connect(struct ldc_channel *lp)
1381 {
1382 unsigned long flags;
1383 int err;
1384
1385 if (lp->cfg.mode == LDC_MODE_RAW)
1386 return -EINVAL;
1387
1388 spin_lock_irqsave(&lp->lock, flags);
1389
1390 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
1391 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES) ||
1392 lp->hs_state != LDC_HS_OPEN)
1393 err = ((lp->hs_state > LDC_HS_OPEN) ? 0 : -EINVAL);
1394 else
1395 err = start_handshake(lp);
1396
1397 spin_unlock_irqrestore(&lp->lock, flags);
1398
1399 return err;
1400 }
1401 EXPORT_SYMBOL(ldc_connect);
1402
1403 int ldc_disconnect(struct ldc_channel *lp)
1404 {
1405 unsigned long hv_err, flags;
1406 int err;
1407
1408 if (lp->cfg.mode == LDC_MODE_RAW)
1409 return -EINVAL;
1410
1411 if (!(lp->flags & LDC_FLAG_ALLOCED_QUEUES) ||
1412 !(lp->flags & LDC_FLAG_REGISTERED_QUEUES))
1413 return -EINVAL;
1414
1415 spin_lock_irqsave(&lp->lock, flags);
1416
1417 err = -ENODEV;
1418 hv_err = sun4v_ldc_tx_qconf(lp->id, 0, 0);
1419 if (hv_err)
1420 goto out_err;
1421
1422 hv_err = sun4v_ldc_tx_qconf(lp->id, lp->tx_ra, lp->tx_num_entries);
1423 if (hv_err)
1424 goto out_err;
1425
1426 hv_err = sun4v_ldc_rx_qconf(lp->id, 0, 0);
1427 if (hv_err)
1428 goto out_err;
1429
1430 hv_err = sun4v_ldc_rx_qconf(lp->id, lp->rx_ra, lp->rx_num_entries);
1431 if (hv_err)
1432 goto out_err;
1433
1434 ldc_set_state(lp, LDC_STATE_BOUND);
1435 lp->hs_state = LDC_HS_OPEN;
1436 lp->flags |= LDC_FLAG_RESET;
1437
1438 spin_unlock_irqrestore(&lp->lock, flags);
1439
1440 return 0;
1441
1442 out_err:
1443 sun4v_ldc_tx_qconf(lp->id, 0, 0);
1444 sun4v_ldc_rx_qconf(lp->id, 0, 0);
1445 free_irq(lp->cfg.tx_irq, lp);
1446 free_irq(lp->cfg.rx_irq, lp);
1447 lp->flags &= ~(LDC_FLAG_REGISTERED_IRQS |
1448 LDC_FLAG_REGISTERED_QUEUES);
1449 ldc_set_state(lp, LDC_STATE_INIT);
1450
1451 spin_unlock_irqrestore(&lp->lock, flags);
1452
1453 return err;
1454 }
1455 EXPORT_SYMBOL(ldc_disconnect);
1456
1457 int ldc_state(struct ldc_channel *lp)
1458 {
1459 return lp->state;
1460 }
1461 EXPORT_SYMBOL(ldc_state);
1462
1463 void ldc_set_state(struct ldc_channel *lp, u8 state)
1464 {
1465 ldcdbg(STATE, "STATE (%s) --> (%s)\n",
1466 state_to_str(lp->state),
1467 state_to_str(state));
1468
1469 lp->state = state;
1470 }
1471 EXPORT_SYMBOL(ldc_set_state);
1472
1473 int ldc_mode(struct ldc_channel *lp)
1474 {
1475 return lp->cfg.mode;
1476 }
1477 EXPORT_SYMBOL(ldc_mode);
1478
1479 int ldc_rx_reset(struct ldc_channel *lp)
1480 {
1481 return __set_rx_head(lp, lp->rx_tail);
1482 }
1483
1484 void __ldc_print(struct ldc_channel *lp, const char *caller)
1485 {
1486 pr_info("%s: id=0x%lx flags=0x%x state=%s cstate=0x%lx hsstate=0x%x\n"
1487 "\trx_h=0x%lx rx_t=0x%lx rx_n=%ld\n"
1488 "\ttx_h=0x%lx tx_t=0x%lx tx_n=%ld\n"
1489 "\trcv_nxt=%u snd_nxt=%u\n",
1490 caller, lp->id, lp->flags, state_to_str(lp->state),
1491 lp->chan_state, lp->hs_state,
1492 lp->rx_head, lp->rx_tail, lp->rx_num_entries,
1493 lp->tx_head, lp->tx_tail, lp->tx_num_entries,
1494 lp->rcv_nxt, lp->snd_nxt);
1495 }
1496
1497 static int write_raw(struct ldc_channel *lp, const void *buf, unsigned int size)
1498 {
1499 struct ldc_packet *p;
1500 unsigned long new_tail, hv_err;
1501 int err;
1502
1503 hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail,
1504 &lp->chan_state);
1505 if (unlikely(hv_err))
1506 return -EBUSY;
1507
1508 if (unlikely(lp->chan_state != LDC_CHANNEL_UP))
1509 return LDC_ABORT(lp);
1510
1511 if (size > LDC_PACKET_SIZE)
1512 return -EMSGSIZE;
1513
1514 p = data_get_tx_packet(lp, &new_tail);
1515 if (!p)
1516 return -EAGAIN;
1517
1518 memcpy(p, buf, size);
1519
1520 err = send_tx_packet(lp, p, new_tail);
1521 if (!err)
1522 err = size;
1523
1524 return err;
1525 }
1526
1527 static int read_raw(struct ldc_channel *lp, void *buf, unsigned int size)
1528 {
1529 struct ldc_packet *p;
1530 unsigned long hv_err, new;
1531 int err;
1532
1533 if (size < LDC_PACKET_SIZE)
1534 return -EINVAL;
1535
1536 hv_err = sun4v_ldc_rx_get_state(lp->id,
1537 &lp->rx_head,
1538 &lp->rx_tail,
1539 &lp->chan_state);
1540 if (hv_err)
1541 return LDC_ABORT(lp);
1542
1543 if (lp->chan_state == LDC_CHANNEL_DOWN ||
1544 lp->chan_state == LDC_CHANNEL_RESETTING)
1545 return -ECONNRESET;
1546
1547 if (lp->rx_head == lp->rx_tail)
1548 return 0;
1549
1550 p = lp->rx_base + (lp->rx_head / LDC_PACKET_SIZE);
1551 memcpy(buf, p, LDC_PACKET_SIZE);
1552
1553 new = rx_advance(lp, lp->rx_head);
1554 lp->rx_head = new;
1555
1556 err = __set_rx_head(lp, new);
1557 if (err < 0)
1558 err = -ECONNRESET;
1559 else
1560 err = LDC_PACKET_SIZE;
1561
1562 return err;
1563 }
1564
1565 static const struct ldc_mode_ops raw_ops = {
1566 .write = write_raw,
1567 .read = read_raw,
1568 };
1569
1570 static int write_nonraw(struct ldc_channel *lp, const void *buf,
1571 unsigned int size)
1572 {
1573 unsigned long hv_err, tail;
1574 unsigned int copied;
1575 u32 seq;
1576 int err;
1577
1578 hv_err = sun4v_ldc_tx_get_state(lp->id, &lp->tx_head, &lp->tx_tail,
1579 &lp->chan_state);
1580 if (unlikely(hv_err))
1581 return -EBUSY;
1582
1583 if (unlikely(lp->chan_state != LDC_CHANNEL_UP))
1584 return LDC_ABORT(lp);
1585
1586 if (!tx_has_space_for(lp, size))
1587 return -EAGAIN;
1588
1589 seq = lp->snd_nxt;
1590 copied = 0;
1591 tail = lp->tx_tail;
1592 while (copied < size) {
1593 struct ldc_packet *p = lp->tx_base + (tail / LDC_PACKET_SIZE);
1594 u8 *data = ((lp->cfg.mode == LDC_MODE_UNRELIABLE) ?
1595 p->u.u_data :
1596 p->u.r.r_data);
1597 int data_len;
1598
1599 p->type = LDC_DATA;
1600 p->stype = LDC_INFO;
1601 p->ctrl = 0;
1602
1603 data_len = size - copied;
1604 if (data_len > lp->mss)
1605 data_len = lp->mss;
1606
1607 BUG_ON(data_len > LDC_LEN);
1608
1609 p->env = (data_len |
1610 (copied == 0 ? LDC_START : 0) |
1611 (data_len == size - copied ? LDC_STOP : 0));
1612
1613 p->seqid = ++seq;
1614
1615 ldcdbg(DATA, "SENT DATA [%02x:%02x:%02x:%02x:%08x]\n",
1616 p->type,
1617 p->stype,
1618 p->ctrl,
1619 p->env,
1620 p->seqid);
1621
1622 memcpy(data, buf, data_len);
1623 buf += data_len;
1624 copied += data_len;
1625
1626 tail = tx_advance(lp, tail);
1627 }
1628
1629 err = set_tx_tail(lp, tail);
1630 if (!err) {
1631 lp->snd_nxt = seq;
1632 err = size;
1633 }
1634
1635 return err;
1636 }
1637
1638 static int rx_bad_seq(struct ldc_channel *lp, struct ldc_packet *p,
1639 struct ldc_packet *first_frag)
1640 {
1641 int err;
1642
1643 if (first_frag)
1644 lp->rcv_nxt = first_frag->seqid - 1;
1645
1646 err = send_data_nack(lp, p);
1647 if (err)
1648 return err;
1649
1650 err = ldc_rx_reset(lp);
1651 if (err < 0)
1652 return LDC_ABORT(lp);
1653
1654 return 0;
1655 }
1656
1657 static int data_ack_nack(struct ldc_channel *lp, struct ldc_packet *p)
1658 {
1659 if (p->stype & LDC_ACK) {
1660 int err = process_data_ack(lp, p);
1661 if (err)
1662 return err;
1663 }
1664 if (p->stype & LDC_NACK)
1665 return LDC_ABORT(lp);
1666
1667 return 0;
1668 }
1669
1670 static int rx_data_wait(struct ldc_channel *lp, unsigned long cur_head)
1671 {
1672 unsigned long dummy;
1673 int limit = 1000;
1674
1675 ldcdbg(DATA, "DATA WAIT cur_head[%lx] rx_head[%lx] rx_tail[%lx]\n",
1676 cur_head, lp->rx_head, lp->rx_tail);
1677 while (limit-- > 0) {
1678 unsigned long hv_err;
1679
1680 hv_err = sun4v_ldc_rx_get_state(lp->id,
1681 &dummy,
1682 &lp->rx_tail,
1683 &lp->chan_state);
1684 if (hv_err)
1685 return LDC_ABORT(lp);
1686
1687 if (lp->chan_state == LDC_CHANNEL_DOWN ||
1688 lp->chan_state == LDC_CHANNEL_RESETTING)
1689 return -ECONNRESET;
1690
1691 if (cur_head != lp->rx_tail) {
1692 ldcdbg(DATA, "DATA WAIT DONE "
1693 "head[%lx] tail[%lx] chan_state[%lx]\n",
1694 dummy, lp->rx_tail, lp->chan_state);
1695 return 0;
1696 }
1697
1698 udelay(1);
1699 }
1700 return -EAGAIN;
1701 }
1702
1703 static int rx_set_head(struct ldc_channel *lp, unsigned long head)
1704 {
1705 int err = __set_rx_head(lp, head);
1706
1707 if (err < 0)
1708 return LDC_ABORT(lp);
1709
1710 lp->rx_head = head;
1711 return 0;
1712 }
1713
1714 static void send_data_ack(struct ldc_channel *lp)
1715 {
1716 unsigned long new_tail;
1717 struct ldc_packet *p;
1718
1719 p = data_get_tx_packet(lp, &new_tail);
1720 if (likely(p)) {
1721 int err;
1722
1723 memset(p, 0, sizeof(*p));
1724 p->type = LDC_DATA;
1725 p->stype = LDC_ACK;
1726 p->ctrl = 0;
1727 p->seqid = lp->snd_nxt + 1;
1728 p->u.r.ackid = lp->rcv_nxt;
1729
1730 err = send_tx_packet(lp, p, new_tail);
1731 if (!err)
1732 lp->snd_nxt++;
1733 }
1734 }
1735
1736 static int read_nonraw(struct ldc_channel *lp, void *buf, unsigned int size)
1737 {
1738 struct ldc_packet *first_frag;
1739 unsigned long hv_err, new;
1740 int err, copied;
1741
1742 hv_err = sun4v_ldc_rx_get_state(lp->id,
1743 &lp->rx_head,
1744 &lp->rx_tail,
1745 &lp->chan_state);
1746 if (hv_err)
1747 return LDC_ABORT(lp);
1748
1749 if (lp->chan_state == LDC_CHANNEL_DOWN ||
1750 lp->chan_state == LDC_CHANNEL_RESETTING)
1751 return -ECONNRESET;
1752
1753 if (lp->rx_head == lp->rx_tail)
1754 return 0;
1755
1756 first_frag = NULL;
1757 copied = err = 0;
1758 new = lp->rx_head;
1759 while (1) {
1760 struct ldc_packet *p;
1761 int pkt_len;
1762
1763 BUG_ON(new == lp->rx_tail);
1764 p = lp->rx_base + (new / LDC_PACKET_SIZE);
1765
1766 ldcdbg(RX, "RX read pkt[%02x:%02x:%02x:%02x:%08x:%08x] "
1767 "rcv_nxt[%08x]\n",
1768 p->type,
1769 p->stype,
1770 p->ctrl,
1771 p->env,
1772 p->seqid,
1773 p->u.r.ackid,
1774 lp->rcv_nxt);
1775
1776 if (unlikely(!rx_seq_ok(lp, p->seqid))) {
1777 err = rx_bad_seq(lp, p, first_frag);
1778 copied = 0;
1779 break;
1780 }
1781
1782 if (p->type & LDC_CTRL) {
1783 err = process_control_frame(lp, p);
1784 if (err < 0)
1785 break;
1786 err = 0;
1787 }
1788
1789 lp->rcv_nxt = p->seqid;
1790
1791 /*
1792 * If this is a control-only packet, there is nothing
1793 * else to do but advance the rx queue since the packet
1794 * was already processed above.
1795 */
1796 if (!(p->type & LDC_DATA)) {
1797 new = rx_advance(lp, new);
1798 break;
1799 }
1800 if (p->stype & (LDC_ACK | LDC_NACK)) {
1801 err = data_ack_nack(lp, p);
1802 if (err)
1803 break;
1804 }
1805 if (!(p->stype & LDC_INFO)) {
1806 new = rx_advance(lp, new);
1807 err = rx_set_head(lp, new);
1808 if (err)
1809 break;
1810 goto no_data;
1811 }
1812
1813 pkt_len = p->env & LDC_LEN;
1814
1815 /* Every initial packet starts with the START bit set.
1816 *
1817 * Singleton packets will have both START+STOP set.
1818 *
1819 * Fragments will have START set in the first frame, STOP
1820 * set in the last frame, and neither bit set in middle
1821 * frames of the packet.
1822 *
1823 * Therefore if we are at the beginning of a packet and
1824 * we don't see START, or we are in the middle of a fragmented
1825 * packet and do see START, we are unsynchronized and should
1826 * flush the RX queue.
1827 */
1828 if ((first_frag == NULL && !(p->env & LDC_START)) ||
1829 (first_frag != NULL && (p->env & LDC_START))) {
1830 if (!first_frag)
1831 new = rx_advance(lp, new);
1832
1833 err = rx_set_head(lp, new);
1834 if (err)
1835 break;
1836
1837 if (!first_frag)
1838 goto no_data;
1839 }
1840 if (!first_frag)
1841 first_frag = p;
1842
1843 if (pkt_len > size - copied) {
1844 /* User didn't give us a big enough buffer,
1845 * what to do? This is a pretty serious error.
1846 *
1847 * Since we haven't updated the RX ring head to
1848 * consume any of the packets, signal the error
1849 * to the user and just leave the RX ring alone.
1850 *
1851 * This seems the best behavior because this allows
1852 * a user of the LDC layer to start with a small
1853 * RX buffer for ldc_read() calls and use -EMSGSIZE
1854 * as a cue to enlarge it's read buffer.
1855 */
1856 err = -EMSGSIZE;
1857 break;
1858 }
1859
1860 /* Ok, we are gonna eat this one. */
1861 new = rx_advance(lp, new);
1862
1863 memcpy(buf,
1864 (lp->cfg.mode == LDC_MODE_UNRELIABLE ?
1865 p->u.u_data : p->u.r.r_data), pkt_len);
1866 buf += pkt_len;
1867 copied += pkt_len;
1868
1869 if (p->env & LDC_STOP)
1870 break;
1871
1872 no_data:
1873 if (new == lp->rx_tail) {
1874 err = rx_data_wait(lp, new);
1875 if (err)
1876 break;
1877 }
1878 }
1879
1880 if (!err)
1881 err = rx_set_head(lp, new);
1882
1883 if (err && first_frag)
1884 lp->rcv_nxt = first_frag->seqid - 1;
1885
1886 if (!err) {
1887 err = copied;
1888 if (err > 0 && lp->cfg.mode != LDC_MODE_UNRELIABLE)
1889 send_data_ack(lp);
1890 }
1891
1892 return err;
1893 }
1894
1895 static const struct ldc_mode_ops nonraw_ops = {
1896 .write = write_nonraw,
1897 .read = read_nonraw,
1898 };
1899
1900 static int write_stream(struct ldc_channel *lp, const void *buf,
1901 unsigned int size)
1902 {
1903 if (size > lp->cfg.mtu)
1904 size = lp->cfg.mtu;
1905 return write_nonraw(lp, buf, size);
1906 }
1907
1908 static int read_stream(struct ldc_channel *lp, void *buf, unsigned int size)
1909 {
1910 if (!lp->mssbuf_len) {
1911 int err = read_nonraw(lp, lp->mssbuf, lp->cfg.mtu);
1912 if (err < 0)
1913 return err;
1914
1915 lp->mssbuf_len = err;
1916 lp->mssbuf_off = 0;
1917 }
1918
1919 if (size > lp->mssbuf_len)
1920 size = lp->mssbuf_len;
1921 memcpy(buf, lp->mssbuf + lp->mssbuf_off, size);
1922
1923 lp->mssbuf_off += size;
1924 lp->mssbuf_len -= size;
1925
1926 return size;
1927 }
1928
1929 static const struct ldc_mode_ops stream_ops = {
1930 .write = write_stream,
1931 .read = read_stream,
1932 };
1933
1934 int ldc_write(struct ldc_channel *lp, const void *buf, unsigned int size)
1935 {
1936 unsigned long flags;
1937 int err;
1938
1939 if (!buf)
1940 return -EINVAL;
1941
1942 if (!size)
1943 return 0;
1944
1945 spin_lock_irqsave(&lp->lock, flags);
1946
1947 if (lp->hs_state != LDC_HS_COMPLETE)
1948 err = -ENOTCONN;
1949 else
1950 err = lp->mops->write(lp, buf, size);
1951
1952 spin_unlock_irqrestore(&lp->lock, flags);
1953
1954 return err;
1955 }
1956 EXPORT_SYMBOL(ldc_write);
1957
1958 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size)
1959 {
1960 unsigned long flags;
1961 int err;
1962
1963 ldcdbg(RX, "%s: entered size=%d\n", __func__, size);
1964
1965 if (!buf)
1966 return -EINVAL;
1967
1968 if (!size)
1969 return 0;
1970
1971 spin_lock_irqsave(&lp->lock, flags);
1972
1973 if (lp->hs_state != LDC_HS_COMPLETE)
1974 err = -ENOTCONN;
1975 else
1976 err = lp->mops->read(lp, buf, size);
1977
1978 spin_unlock_irqrestore(&lp->lock, flags);
1979
1980 ldcdbg(RX, "%s: mode=%d, head=%lu, tail=%lu rv=%d\n", __func__,
1981 lp->cfg.mode, lp->rx_head, lp->rx_tail, err);
1982
1983 return err;
1984 }
1985 EXPORT_SYMBOL(ldc_read);
1986
1987 static u64 pagesize_code(void)
1988 {
1989 switch (PAGE_SIZE) {
1990 default:
1991 case (8ULL * 1024ULL):
1992 return 0;
1993 case (64ULL * 1024ULL):
1994 return 1;
1995 case (512ULL * 1024ULL):
1996 return 2;
1997 case (4ULL * 1024ULL * 1024ULL):
1998 return 3;
1999 case (32ULL * 1024ULL * 1024ULL):
2000 return 4;
2001 case (256ULL * 1024ULL * 1024ULL):
2002 return 5;
2003 }
2004 }
2005
2006 static u64 make_cookie(u64 index, u64 pgsz_code, u64 page_offset)
2007 {
2008 return ((pgsz_code << COOKIE_PGSZ_CODE_SHIFT) |
2009 (index << PAGE_SHIFT) |
2010 page_offset);
2011 }
2012
2013
2014 static struct ldc_mtable_entry *alloc_npages(struct ldc_iommu *iommu,
2015 unsigned long npages)
2016 {
2017 long entry;
2018
2019 entry = iommu_tbl_range_alloc(NULL, &iommu->iommu_map_table,
2020 npages, NULL, (unsigned long)-1, 0);
2021 if (unlikely(entry == IOMMU_ERROR_CODE))
2022 return NULL;
2023
2024 return iommu->page_table + entry;
2025 }
2026
2027 static u64 perm_to_mte(unsigned int map_perm)
2028 {
2029 u64 mte_base;
2030
2031 mte_base = pagesize_code();
2032
2033 if (map_perm & LDC_MAP_SHADOW) {
2034 if (map_perm & LDC_MAP_R)
2035 mte_base |= LDC_MTE_COPY_R;
2036 if (map_perm & LDC_MAP_W)
2037 mte_base |= LDC_MTE_COPY_W;
2038 }
2039 if (map_perm & LDC_MAP_DIRECT) {
2040 if (map_perm & LDC_MAP_R)
2041 mte_base |= LDC_MTE_READ;
2042 if (map_perm & LDC_MAP_W)
2043 mte_base |= LDC_MTE_WRITE;
2044 if (map_perm & LDC_MAP_X)
2045 mte_base |= LDC_MTE_EXEC;
2046 }
2047 if (map_perm & LDC_MAP_IO) {
2048 if (map_perm & LDC_MAP_R)
2049 mte_base |= LDC_MTE_IOMMU_R;
2050 if (map_perm & LDC_MAP_W)
2051 mte_base |= LDC_MTE_IOMMU_W;
2052 }
2053
2054 return mte_base;
2055 }
2056
2057 static int pages_in_region(unsigned long base, long len)
2058 {
2059 int count = 0;
2060
2061 do {
2062 unsigned long new = (base + PAGE_SIZE) & PAGE_MASK;
2063
2064 len -= (new - base);
2065 base = new;
2066 count++;
2067 } while (len > 0);
2068
2069 return count;
2070 }
2071
2072 struct cookie_state {
2073 struct ldc_mtable_entry *page_table;
2074 struct ldc_trans_cookie *cookies;
2075 u64 mte_base;
2076 u64 prev_cookie;
2077 u32 pte_idx;
2078 u32 nc;
2079 };
2080
2081 static void fill_cookies(struct cookie_state *sp, unsigned long pa,
2082 unsigned long off, unsigned long len)
2083 {
2084 do {
2085 unsigned long tlen, new = pa + PAGE_SIZE;
2086 u64 this_cookie;
2087
2088 sp->page_table[sp->pte_idx].mte = sp->mte_base | pa;
2089
2090 tlen = PAGE_SIZE;
2091 if (off)
2092 tlen = PAGE_SIZE - off;
2093 if (tlen > len)
2094 tlen = len;
2095
2096 this_cookie = make_cookie(sp->pte_idx,
2097 pagesize_code(), off);
2098
2099 off = 0;
2100
2101 if (this_cookie == sp->prev_cookie) {
2102 sp->cookies[sp->nc - 1].cookie_size += tlen;
2103 } else {
2104 sp->cookies[sp->nc].cookie_addr = this_cookie;
2105 sp->cookies[sp->nc].cookie_size = tlen;
2106 sp->nc++;
2107 }
2108 sp->prev_cookie = this_cookie + tlen;
2109
2110 sp->pte_idx++;
2111
2112 len -= tlen;
2113 pa = new;
2114 } while (len > 0);
2115 }
2116
2117 static int sg_count_one(struct scatterlist *sg)
2118 {
2119 unsigned long base = page_to_pfn(sg_page(sg)) << PAGE_SHIFT;
2120 long len = sg->length;
2121
2122 if ((sg->offset | len) & (8UL - 1))
2123 return -EFAULT;
2124
2125 return pages_in_region(base + sg->offset, len);
2126 }
2127
2128 static int sg_count_pages(struct scatterlist *sg, int num_sg)
2129 {
2130 int count;
2131 int i;
2132
2133 count = 0;
2134 for (i = 0; i < num_sg; i++) {
2135 int err = sg_count_one(sg + i);
2136 if (err < 0)
2137 return err;
2138 count += err;
2139 }
2140
2141 return count;
2142 }
2143
2144 int ldc_map_sg(struct ldc_channel *lp,
2145 struct scatterlist *sg, int num_sg,
2146 struct ldc_trans_cookie *cookies, int ncookies,
2147 unsigned int map_perm)
2148 {
2149 unsigned long i, npages;
2150 struct ldc_mtable_entry *base;
2151 struct cookie_state state;
2152 struct ldc_iommu *iommu;
2153 int err;
2154 struct scatterlist *s;
2155
2156 if (map_perm & ~LDC_MAP_ALL)
2157 return -EINVAL;
2158
2159 err = sg_count_pages(sg, num_sg);
2160 if (err < 0)
2161 return err;
2162
2163 npages = err;
2164 if (err > ncookies)
2165 return -EMSGSIZE;
2166
2167 iommu = &lp->iommu;
2168
2169 base = alloc_npages(iommu, npages);
2170
2171 if (!base)
2172 return -ENOMEM;
2173
2174 state.page_table = iommu->page_table;
2175 state.cookies = cookies;
2176 state.mte_base = perm_to_mte(map_perm);
2177 state.prev_cookie = ~(u64)0;
2178 state.pte_idx = (base - iommu->page_table);
2179 state.nc = 0;
2180
2181 for_each_sg(sg, s, num_sg, i) {
2182 fill_cookies(&state, page_to_pfn(sg_page(s)) << PAGE_SHIFT,
2183 s->offset, s->length);
2184 }
2185
2186 return state.nc;
2187 }
2188 EXPORT_SYMBOL(ldc_map_sg);
2189
2190 int ldc_map_single(struct ldc_channel *lp,
2191 void *buf, unsigned int len,
2192 struct ldc_trans_cookie *cookies, int ncookies,
2193 unsigned int map_perm)
2194 {
2195 unsigned long npages, pa;
2196 struct ldc_mtable_entry *base;
2197 struct cookie_state state;
2198 struct ldc_iommu *iommu;
2199
2200 if ((map_perm & ~LDC_MAP_ALL) || (ncookies < 1))
2201 return -EINVAL;
2202
2203 pa = __pa(buf);
2204 if ((pa | len) & (8UL - 1))
2205 return -EFAULT;
2206
2207 npages = pages_in_region(pa, len);
2208
2209 iommu = &lp->iommu;
2210
2211 base = alloc_npages(iommu, npages);
2212
2213 if (!base)
2214 return -ENOMEM;
2215
2216 state.page_table = iommu->page_table;
2217 state.cookies = cookies;
2218 state.mte_base = perm_to_mte(map_perm);
2219 state.prev_cookie = ~(u64)0;
2220 state.pte_idx = (base - iommu->page_table);
2221 state.nc = 0;
2222 fill_cookies(&state, (pa & PAGE_MASK), (pa & ~PAGE_MASK), len);
2223 BUG_ON(state.nc > ncookies);
2224
2225 return state.nc;
2226 }
2227 EXPORT_SYMBOL(ldc_map_single);
2228
2229
2230 static void free_npages(unsigned long id, struct ldc_iommu *iommu,
2231 u64 cookie, u64 size)
2232 {
2233 unsigned long npages, entry;
2234
2235 npages = PAGE_ALIGN(((cookie & ~PAGE_MASK) + size)) >> PAGE_SHIFT;
2236
2237 entry = ldc_cookie_to_index(cookie, iommu);
2238 ldc_demap(iommu, id, cookie, entry, npages);
2239 iommu_tbl_range_free(&iommu->iommu_map_table, cookie, npages, entry);
2240 }
2241
2242 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
2243 int ncookies)
2244 {
2245 struct ldc_iommu *iommu = &lp->iommu;
2246 int i;
2247 unsigned long flags;
2248
2249 spin_lock_irqsave(&iommu->lock, flags);
2250 for (i = 0; i < ncookies; i++) {
2251 u64 addr = cookies[i].cookie_addr;
2252 u64 size = cookies[i].cookie_size;
2253
2254 free_npages(lp->id, iommu, addr, size);
2255 }
2256 spin_unlock_irqrestore(&iommu->lock, flags);
2257 }
2258 EXPORT_SYMBOL(ldc_unmap);
2259
2260 int ldc_copy(struct ldc_channel *lp, int copy_dir,
2261 void *buf, unsigned int len, unsigned long offset,
2262 struct ldc_trans_cookie *cookies, int ncookies)
2263 {
2264 unsigned int orig_len;
2265 unsigned long ra;
2266 int i;
2267
2268 if (copy_dir != LDC_COPY_IN && copy_dir != LDC_COPY_OUT) {
2269 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Bad copy_dir[%d]\n",
2270 lp->id, copy_dir);
2271 return -EINVAL;
2272 }
2273
2274 ra = __pa(buf);
2275 if ((ra | len | offset) & (8UL - 1)) {
2276 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Unaligned buffer "
2277 "ra[%lx] len[%x] offset[%lx]\n",
2278 lp->id, ra, len, offset);
2279 return -EFAULT;
2280 }
2281
2282 if (lp->hs_state != LDC_HS_COMPLETE ||
2283 (lp->flags & LDC_FLAG_RESET)) {
2284 printk(KERN_ERR PFX "ldc_copy: ID[%lu] Link down hs_state[%x] "
2285 "flags[%x]\n", lp->id, lp->hs_state, lp->flags);
2286 return -ECONNRESET;
2287 }
2288
2289 orig_len = len;
2290 for (i = 0; i < ncookies; i++) {
2291 unsigned long cookie_raddr = cookies[i].cookie_addr;
2292 unsigned long this_len = cookies[i].cookie_size;
2293 unsigned long actual_len;
2294
2295 if (unlikely(offset)) {
2296 unsigned long this_off = offset;
2297
2298 if (this_off > this_len)
2299 this_off = this_len;
2300
2301 offset -= this_off;
2302 this_len -= this_off;
2303 if (!this_len)
2304 continue;
2305 cookie_raddr += this_off;
2306 }
2307
2308 if (this_len > len)
2309 this_len = len;
2310
2311 while (1) {
2312 unsigned long hv_err;
2313
2314 hv_err = sun4v_ldc_copy(lp->id, copy_dir,
2315 cookie_raddr, ra,
2316 this_len, &actual_len);
2317 if (unlikely(hv_err)) {
2318 printk(KERN_ERR PFX "ldc_copy: ID[%lu] "
2319 "HV error %lu\n",
2320 lp->id, hv_err);
2321 if (lp->hs_state != LDC_HS_COMPLETE ||
2322 (lp->flags & LDC_FLAG_RESET))
2323 return -ECONNRESET;
2324 else
2325 return -EFAULT;
2326 }
2327
2328 cookie_raddr += actual_len;
2329 ra += actual_len;
2330 len -= actual_len;
2331 if (actual_len == this_len)
2332 break;
2333
2334 this_len -= actual_len;
2335 }
2336
2337 if (!len)
2338 break;
2339 }
2340
2341 /* It is caller policy what to do about short copies.
2342 * For example, a networking driver can declare the
2343 * packet a runt and drop it.
2344 */
2345
2346 return orig_len - len;
2347 }
2348 EXPORT_SYMBOL(ldc_copy);
2349
2350 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
2351 struct ldc_trans_cookie *cookies, int *ncookies,
2352 unsigned int map_perm)
2353 {
2354 void *buf;
2355 int err;
2356
2357 if (len & (8UL - 1))
2358 return ERR_PTR(-EINVAL);
2359
2360 buf = kzalloc(len, GFP_ATOMIC);
2361 if (!buf)
2362 return ERR_PTR(-ENOMEM);
2363
2364 err = ldc_map_single(lp, buf, len, cookies, *ncookies, map_perm);
2365 if (err < 0) {
2366 kfree(buf);
2367 return ERR_PTR(err);
2368 }
2369 *ncookies = err;
2370
2371 return buf;
2372 }
2373 EXPORT_SYMBOL(ldc_alloc_exp_dring);
2374
2375 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf, unsigned int len,
2376 struct ldc_trans_cookie *cookies, int ncookies)
2377 {
2378 ldc_unmap(lp, cookies, ncookies);
2379 kfree(buf);
2380 }
2381 EXPORT_SYMBOL(ldc_free_exp_dring);
2382
2383 static int __init ldc_init(void)
2384 {
2385 unsigned long major, minor;
2386 struct mdesc_handle *hp;
2387 const u64 *v;
2388 int err;
2389 u64 mp;
2390
2391 hp = mdesc_grab();
2392 if (!hp)
2393 return -ENODEV;
2394
2395 mp = mdesc_node_by_name(hp, MDESC_NODE_NULL, "platform");
2396 err = -ENODEV;
2397 if (mp == MDESC_NODE_NULL)
2398 goto out;
2399
2400 v = mdesc_get_property(hp, mp, "domaining-enabled", NULL);
2401 if (!v)
2402 goto out;
2403
2404 major = 1;
2405 minor = 0;
2406 if (sun4v_hvapi_register(HV_GRP_LDOM, major, &minor)) {
2407 printk(KERN_INFO PFX "Could not register LDOM hvapi.\n");
2408 goto out;
2409 }
2410
2411 printk(KERN_INFO "%s", version);
2412
2413 if (!*v) {
2414 printk(KERN_INFO PFX "Domaining disabled.\n");
2415 goto out;
2416 }
2417 ldom_domaining_enabled = 1;
2418 err = 0;
2419
2420 out:
2421 mdesc_release(hp);
2422 return err;
2423 }
2424
2425 core_initcall(ldc_init);
Linux with added FPC-III support