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