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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / thunderbolt / tunnel.c
blobdcdf9c7a9caeddc2021aa199585a5a049a114b42
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Thunderbolt driver - Tunneling support
4 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
6 * Copyright (C) 2019, Intel Corporation
7 */
8
9 #include <linux/delay.h>
10 #include <linux/slab.h>
11 #include <linux/list.h>
12
13 #include "tunnel.h"
14 #include "tb.h"
15
16 /* PCIe adapters use always HopID of 8 for both directions */
17 #define TB_PCI_HOPID 8
18
19 #define TB_PCI_PATH_DOWN 0
20 #define TB_PCI_PATH_UP 1
21
22 /* USB3 adapters use always HopID of 8 for both directions */
23 #define TB_USB3_HOPID 8
24
25 #define TB_USB3_PATH_DOWN 0
26 #define TB_USB3_PATH_UP 1
27
28 /* DP adapters use HopID 8 for AUX and 9 for Video */
29 #define TB_DP_AUX_TX_HOPID 8
30 #define TB_DP_AUX_RX_HOPID 8
31 #define TB_DP_VIDEO_HOPID 9
32
33 #define TB_DP_VIDEO_PATH_OUT 0
34 #define TB_DP_AUX_PATH_OUT 1
35 #define TB_DP_AUX_PATH_IN 2
36
37 static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" };
38
39 #define __TB_TUNNEL_PRINT(level, tunnel, fmt, arg...) \
40 do { \
41 struct tb_tunnel *__tunnel = (tunnel); \
42 level(__tunnel->tb, "%llx:%x <-> %llx:%x (%s): " fmt, \
43 tb_route(__tunnel->src_port->sw), \
44 __tunnel->src_port->port, \
45 tb_route(__tunnel->dst_port->sw), \
46 __tunnel->dst_port->port, \
47 tb_tunnel_names[__tunnel->type], \
48 ## arg); \
49 } while (0)
50
51 #define tb_tunnel_WARN(tunnel, fmt, arg...) \
52 __TB_TUNNEL_PRINT(tb_WARN, tunnel, fmt, ##arg)
53 #define tb_tunnel_warn(tunnel, fmt, arg...) \
54 __TB_TUNNEL_PRINT(tb_warn, tunnel, fmt, ##arg)
55 #define tb_tunnel_info(tunnel, fmt, arg...) \
56 __TB_TUNNEL_PRINT(tb_info, tunnel, fmt, ##arg)
57 #define tb_tunnel_dbg(tunnel, fmt, arg...) \
58 __TB_TUNNEL_PRINT(tb_dbg, tunnel, fmt, ##arg)
59
60 static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths,
61 enum tb_tunnel_type type)
62 {
63 struct tb_tunnel *tunnel;
64
65 tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL);
66 if (!tunnel)
67 return NULL;
68
69 tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL);
70 if (!tunnel->paths) {
71 tb_tunnel_free(tunnel);
72 return NULL;
73 }
74
75 INIT_LIST_HEAD(&tunnel->list);
76 tunnel->tb = tb;
77 tunnel->npaths = npaths;
78 tunnel->type = type;
79
80 return tunnel;
81 }
82
83 static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate)
84 {
85 int res;
86
87 res = tb_pci_port_enable(tunnel->src_port, activate);
88 if (res)
89 return res;
90
91 if (tb_port_is_pcie_up(tunnel->dst_port))
92 return tb_pci_port_enable(tunnel->dst_port, activate);
93
94 return 0;
95 }
96
97 static int tb_initial_credits(const struct tb_switch *sw)
98 {
99 /* If the path is complete sw is not NULL */
100 if (sw) {
101 /* More credits for faster link */
102 switch (sw->link_speed * sw->link_width) {
103 case 40:
104 return 32;
105 case 20:
106 return 24;
107 }
108 }
109
110 return 16;
111 }
112
113 static void tb_pci_init_path(struct tb_path *path)
114 {
115 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
116 path->egress_shared_buffer = TB_PATH_NONE;
117 path->ingress_fc_enable = TB_PATH_ALL;
118 path->ingress_shared_buffer = TB_PATH_NONE;
119 path->priority = 3;
120 path->weight = 1;
121 path->drop_packages = 0;
122 path->nfc_credits = 0;
123 path->hops[0].initial_credits = 7;
124 if (path->path_length > 1)
125 path->hops[1].initial_credits =
126 tb_initial_credits(path->hops[1].in_port->sw);
127 }
128
129 /**
130 * tb_tunnel_discover_pci() - Discover existing PCIe tunnels
131 * @tb: Pointer to the domain structure
132 * @down: PCIe downstream adapter
133 *
134 * If @down adapter is active, follows the tunnel to the PCIe upstream
135 * adapter and back. Returns the discovered tunnel or %NULL if there was
136 * no tunnel.
137 */
138 struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down)
139 {
140 struct tb_tunnel *tunnel;
141 struct tb_path *path;
142
143 if (!tb_pci_port_is_enabled(down))
144 return NULL;
145
146 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI);
147 if (!tunnel)
148 return NULL;
149
150 tunnel->activate = tb_pci_activate;
151 tunnel->src_port = down;
152
153 /*
154 * Discover both paths even if they are not complete. We will
155 * clean them up by calling tb_tunnel_deactivate() below in that
156 * case.
157 */
158 path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1,
159 &tunnel->dst_port, "PCIe Up");
160 if (!path) {
161 /* Just disable the downstream port */
162 tb_pci_port_enable(down, false);
163 goto err_free;
164 }
165 tunnel->paths[TB_PCI_PATH_UP] = path;
166 tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP]);
167
168 path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL,
169 "PCIe Down");
170 if (!path)
171 goto err_deactivate;
172 tunnel->paths[TB_PCI_PATH_DOWN] = path;
173 tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN]);
174
175 /* Validate that the tunnel is complete */
176 if (!tb_port_is_pcie_up(tunnel->dst_port)) {
177 tb_port_warn(tunnel->dst_port,
178 "path does not end on a PCIe adapter, cleaning up\n");
179 goto err_deactivate;
180 }
181
182 if (down != tunnel->src_port) {
183 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");
184 goto err_deactivate;
185 }
186
187 if (!tb_pci_port_is_enabled(tunnel->dst_port)) {
188 tb_tunnel_warn(tunnel,
189 "tunnel is not fully activated, cleaning up\n");
190 goto err_deactivate;
191 }
192
193 tb_tunnel_dbg(tunnel, "discovered\n");
194 return tunnel;
195
196 err_deactivate:
197 tb_tunnel_deactivate(tunnel);
198 err_free:
199 tb_tunnel_free(tunnel);
200
201 return NULL;
202 }
203
204 /**
205 * tb_tunnel_alloc_pci() - allocate a pci tunnel
206 * @tb: Pointer to the domain structure
207 * @up: PCIe upstream adapter port
208 * @down: PCIe downstream adapter port
209 *
210 * Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and
211 * TB_TYPE_PCIE_DOWN.
212 *
213 * Return: Returns a tb_tunnel on success or NULL on failure.
214 */
215 struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up,
216 struct tb_port *down)
217 {
218 struct tb_tunnel *tunnel;
219 struct tb_path *path;
220
221 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI);
222 if (!tunnel)
223 return NULL;
224
225 tunnel->activate = tb_pci_activate;
226 tunnel->src_port = down;
227 tunnel->dst_port = up;
228
229 path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0,
230 "PCIe Down");
231 if (!path) {
232 tb_tunnel_free(tunnel);
233 return NULL;
234 }
235 tb_pci_init_path(path);
236 tunnel->paths[TB_PCI_PATH_DOWN] = path;
237
238 path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0,
239 "PCIe Up");
240 if (!path) {
241 tb_tunnel_free(tunnel);
242 return NULL;
243 }
244 tb_pci_init_path(path);
245 tunnel->paths[TB_PCI_PATH_UP] = path;
246
247 return tunnel;
248 }
249
250 static bool tb_dp_is_usb4(const struct tb_switch *sw)
251 {
252 /* Titan Ridge DP adapters need the same treatment as USB4 */
253 return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw);
254 }
255
256 static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out)
257 {
258 int timeout = 10;
259 u32 val;
260 int ret;
261
262 /* Both ends need to support this */
263 if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw))
264 return 0;
265
266 ret = tb_port_read(out, &val, TB_CFG_PORT,
267 out->cap_adap + DP_STATUS_CTRL, 1);
268 if (ret)
269 return ret;
270
271 val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS;
272
273 ret = tb_port_write(out, &val, TB_CFG_PORT,
274 out->cap_adap + DP_STATUS_CTRL, 1);
275 if (ret)
276 return ret;
277
278 do {
279 ret = tb_port_read(out, &val, TB_CFG_PORT,
280 out->cap_adap + DP_STATUS_CTRL, 1);
281 if (ret)
282 return ret;
283 if (!(val & DP_STATUS_CTRL_CMHS))
284 return 0;
285 usleep_range(10, 100);
286 } while (timeout--);
287
288 return -ETIMEDOUT;
289 }
290
291 static inline u32 tb_dp_cap_get_rate(u32 val)
292 {
293 u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT;
294
295 switch (rate) {
296 case DP_COMMON_CAP_RATE_RBR:
297 return 1620;
298 case DP_COMMON_CAP_RATE_HBR:
299 return 2700;
300 case DP_COMMON_CAP_RATE_HBR2:
301 return 5400;
302 case DP_COMMON_CAP_RATE_HBR3:
303 return 8100;
304 default:
305 return 0;
306 }
307 }
308
309 static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate)
310 {
311 val &= ~DP_COMMON_CAP_RATE_MASK;
312 switch (rate) {
313 default:
314 WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate);
315 fallthrough;
316 case 1620:
317 val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT;
318 break;
319 case 2700:
320 val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT;
321 break;
322 case 5400:
323 val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT;
324 break;
325 case 8100:
326 val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT;
327 break;
328 }
329 return val;
330 }
331
332 static inline u32 tb_dp_cap_get_lanes(u32 val)
333 {
334 u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT;
335
336 switch (lanes) {
337 case DP_COMMON_CAP_1_LANE:
338 return 1;
339 case DP_COMMON_CAP_2_LANES:
340 return 2;
341 case DP_COMMON_CAP_4_LANES:
342 return 4;
343 default:
344 return 0;
345 }
346 }
347
348 static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes)
349 {
350 val &= ~DP_COMMON_CAP_LANES_MASK;
351 switch (lanes) {
352 default:
353 WARN(1, "invalid number of lanes %u passed, defaulting to 1\n",
354 lanes);
355 fallthrough;
356 case 1:
357 val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT;
358 break;
359 case 2:
360 val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT;
361 break;
362 case 4:
363 val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT;
364 break;
365 }
366 return val;
367 }
368
369 static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes)
370 {
371 /* Tunneling removes the DP 8b/10b encoding */
372 return rate * lanes * 8 / 10;
373 }
374
375 static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes,
376 u32 out_rate, u32 out_lanes, u32 *new_rate,
377 u32 *new_lanes)
378 {
379 static const u32 dp_bw[][2] = {
380 /* Mb/s, lanes */
381 { 8100, 4 }, /* 25920 Mb/s */
382 { 5400, 4 }, /* 17280 Mb/s */
383 { 8100, 2 }, /* 12960 Mb/s */
384 { 2700, 4 }, /* 8640 Mb/s */
385 { 5400, 2 }, /* 8640 Mb/s */
386 { 8100, 1 }, /* 6480 Mb/s */
387 { 1620, 4 }, /* 5184 Mb/s */
388 { 5400, 1 }, /* 4320 Mb/s */
389 { 2700, 2 }, /* 4320 Mb/s */
390 { 1620, 2 }, /* 2592 Mb/s */
391 { 2700, 1 }, /* 2160 Mb/s */
392 { 1620, 1 }, /* 1296 Mb/s */
393 };
394 unsigned int i;
395
396 /*
397 * Find a combination that can fit into max_bw and does not
398 * exceed the maximum rate and lanes supported by the DP OUT and
399 * DP IN adapters.
400 */
401 for (i = 0; i < ARRAY_SIZE(dp_bw); i++) {
402 if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes)
403 continue;
404
405 if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes)
406 continue;
407
408 if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) {
409 *new_rate = dp_bw[i][0];
410 *new_lanes = dp_bw[i][1];
411 return 0;
412 }
413 }
414
415 return -ENOSR;
416 }
417
418 static int tb_dp_xchg_caps(struct tb_tunnel *tunnel)
419 {
420 u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw;
421 struct tb_port *out = tunnel->dst_port;
422 struct tb_port *in = tunnel->src_port;
423 int ret, max_bw;
424
425 /*
426 * Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for
427 * newer generation hardware.
428 */
429 if (in->sw->generation < 2 || out->sw->generation < 2)
430 return 0;
431
432 /*
433 * Perform connection manager handshake between IN and OUT ports
434 * before capabilities exchange can take place.
435 */
436 ret = tb_dp_cm_handshake(in, out);
437 if (ret)
438 return ret;
439
440 /* Read both DP_LOCAL_CAP registers */
441 ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT,
442 in->cap_adap + DP_LOCAL_CAP, 1);
443 if (ret)
444 return ret;
445
446 ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT,
447 out->cap_adap + DP_LOCAL_CAP, 1);
448 if (ret)
449 return ret;
450
451 /* Write IN local caps to OUT remote caps */
452 ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT,
453 out->cap_adap + DP_REMOTE_CAP, 1);
454 if (ret)
455 return ret;
456
457 in_rate = tb_dp_cap_get_rate(in_dp_cap);
458 in_lanes = tb_dp_cap_get_lanes(in_dp_cap);
459 tb_port_dbg(in, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
460 in_rate, in_lanes, tb_dp_bandwidth(in_rate, in_lanes));
461
462 /*
463 * If the tunnel bandwidth is limited (max_bw is set) then see
464 * if we need to reduce bandwidth to fit there.
465 */
466 out_rate = tb_dp_cap_get_rate(out_dp_cap);
467 out_lanes = tb_dp_cap_get_lanes(out_dp_cap);
468 bw = tb_dp_bandwidth(out_rate, out_lanes);
469 tb_port_dbg(out, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
470 out_rate, out_lanes, bw);
471
472 if (in->sw->config.depth < out->sw->config.depth)
473 max_bw = tunnel->max_down;
474 else
475 max_bw = tunnel->max_up;
476
477 if (max_bw && bw > max_bw) {
478 u32 new_rate, new_lanes, new_bw;
479
480 ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes,
481 out_rate, out_lanes, &new_rate,
482 &new_lanes);
483 if (ret) {
484 tb_port_info(out, "not enough bandwidth for DP tunnel\n");
485 return ret;
486 }
487
488 new_bw = tb_dp_bandwidth(new_rate, new_lanes);
489 tb_port_dbg(out, "bandwidth reduced to %u Mb/s x%u = %u Mb/s\n",
490 new_rate, new_lanes, new_bw);
491
492 /*
493 * Set new rate and number of lanes before writing it to
494 * the IN port remote caps.
495 */
496 out_dp_cap = tb_dp_cap_set_rate(out_dp_cap, new_rate);
497 out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes);
498 }
499
500 return tb_port_write(in, &out_dp_cap, TB_CFG_PORT,
501 in->cap_adap + DP_REMOTE_CAP, 1);
502 }
503
504 static int tb_dp_activate(struct tb_tunnel *tunnel, bool active)
505 {
506 int ret;
507
508 if (active) {
509 struct tb_path **paths;
510 int last;
511
512 paths = tunnel->paths;
513 last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1;
514
515 tb_dp_port_set_hops(tunnel->src_port,
516 paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index,
517 paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index,
518 paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index);
519
520 tb_dp_port_set_hops(tunnel->dst_port,
521 paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index,
522 paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index,
523 paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index);
524 } else {
525 tb_dp_port_hpd_clear(tunnel->src_port);
526 tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0);
527 if (tb_port_is_dpout(tunnel->dst_port))
528 tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0);
529 }
530
531 ret = tb_dp_port_enable(tunnel->src_port, active);
532 if (ret)
533 return ret;
534
535 if (tb_port_is_dpout(tunnel->dst_port))
536 return tb_dp_port_enable(tunnel->dst_port, active);
537
538 return 0;
539 }
540
541 static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
542 int *consumed_down)
543 {
544 struct tb_port *in = tunnel->src_port;
545 const struct tb_switch *sw = in->sw;
546 u32 val, rate = 0, lanes = 0;
547 int ret;
548
549 if (tb_dp_is_usb4(sw)) {
550 int timeout = 20;
551
552 /*
553 * Wait for DPRX done. Normally it should be already set
554 * for active tunnel.
555 */
556 do {
557 ret = tb_port_read(in, &val, TB_CFG_PORT,
558 in->cap_adap + DP_COMMON_CAP, 1);
559 if (ret)
560 return ret;
561
562 if (val & DP_COMMON_CAP_DPRX_DONE) {
563 rate = tb_dp_cap_get_rate(val);
564 lanes = tb_dp_cap_get_lanes(val);
565 break;
566 }
567 msleep(250);
568 } while (timeout--);
569
570 if (!timeout)
571 return -ETIMEDOUT;
572 } else if (sw->generation >= 2) {
573 /*
574 * Read from the copied remote cap so that we take into
575 * account if capabilities were reduced during exchange.
576 */
577 ret = tb_port_read(in, &val, TB_CFG_PORT,
578 in->cap_adap + DP_REMOTE_CAP, 1);
579 if (ret)
580 return ret;
581
582 rate = tb_dp_cap_get_rate(val);
583 lanes = tb_dp_cap_get_lanes(val);
584 } else {
585 /* No bandwidth management for legacy devices */
586 *consumed_up = 0;
587 *consumed_down = 0;
588 return 0;
589 }
590
591 if (in->sw->config.depth < tunnel->dst_port->sw->config.depth) {
592 *consumed_up = 0;
593 *consumed_down = tb_dp_bandwidth(rate, lanes);
594 } else {
595 *consumed_up = tb_dp_bandwidth(rate, lanes);
596 *consumed_down = 0;
597 }
598
599 return 0;
600 }
601
602 static void tb_dp_init_aux_path(struct tb_path *path)
603 {
604 int i;
605
606 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
607 path->egress_shared_buffer = TB_PATH_NONE;
608 path->ingress_fc_enable = TB_PATH_ALL;
609 path->ingress_shared_buffer = TB_PATH_NONE;
610 path->priority = 2;
611 path->weight = 1;
612
613 for (i = 0; i < path->path_length; i++)
614 path->hops[i].initial_credits = 1;
615 }
616
617 static void tb_dp_init_video_path(struct tb_path *path, bool discover)
618 {
619 u32 nfc_credits = path->hops[0].in_port->config.nfc_credits;
620
621 path->egress_fc_enable = TB_PATH_NONE;
622 path->egress_shared_buffer = TB_PATH_NONE;
623 path->ingress_fc_enable = TB_PATH_NONE;
624 path->ingress_shared_buffer = TB_PATH_NONE;
625 path->priority = 1;
626 path->weight = 1;
627
628 if (discover) {
629 path->nfc_credits = nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
630 } else {
631 u32 max_credits;
632
633 max_credits = (nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
634 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
635 /* Leave some credits for AUX path */
636 path->nfc_credits = min(max_credits - 2, 12U);
637 }
638 }
639
640 /**
641 * tb_tunnel_discover_dp() - Discover existing Display Port tunnels
642 * @tb: Pointer to the domain structure
643 * @in: DP in adapter
644 *
645 * If @in adapter is active, follows the tunnel to the DP out adapter
646 * and back. Returns the discovered tunnel or %NULL if there was no
647 * tunnel.
648 *
649 * Return: DP tunnel or %NULL if no tunnel found.
650 */
651 struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in)
652 {
653 struct tb_tunnel *tunnel;
654 struct tb_port *port;
655 struct tb_path *path;
656
657 if (!tb_dp_port_is_enabled(in))
658 return NULL;
659
660 tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);
661 if (!tunnel)
662 return NULL;
663
664 tunnel->init = tb_dp_xchg_caps;
665 tunnel->activate = tb_dp_activate;
666 tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;
667 tunnel->src_port = in;
668
669 path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1,
670 &tunnel->dst_port, "Video");
671 if (!path) {
672 /* Just disable the DP IN port */
673 tb_dp_port_enable(in, false);
674 goto err_free;
675 }
676 tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path;
677 tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT], true);
678
679 path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX");
680 if (!path)
681 goto err_deactivate;
682 tunnel->paths[TB_DP_AUX_PATH_OUT] = path;
683 tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT]);
684
685 path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID,
686 &port, "AUX RX");
687 if (!path)
688 goto err_deactivate;
689 tunnel->paths[TB_DP_AUX_PATH_IN] = path;
690 tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN]);
691
692 /* Validate that the tunnel is complete */
693 if (!tb_port_is_dpout(tunnel->dst_port)) {
694 tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n");
695 goto err_deactivate;
696 }
697
698 if (!tb_dp_port_is_enabled(tunnel->dst_port))
699 goto err_deactivate;
700
701 if (!tb_dp_port_hpd_is_active(tunnel->dst_port))
702 goto err_deactivate;
703
704 if (port != tunnel->src_port) {
705 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");
706 goto err_deactivate;
707 }
708
709 tb_tunnel_dbg(tunnel, "discovered\n");
710 return tunnel;
711
712 err_deactivate:
713 tb_tunnel_deactivate(tunnel);
714 err_free:
715 tb_tunnel_free(tunnel);
716
717 return NULL;
718 }
719
720 /**
721 * tb_tunnel_alloc_dp() - allocate a Display Port tunnel
722 * @tb: Pointer to the domain structure
723 * @in: DP in adapter port
724 * @out: DP out adapter port
725 * @max_up: Maximum available upstream bandwidth for the DP tunnel (%0
726 * if not limited)
727 * @max_down: Maximum available downstream bandwidth for the DP tunnel
728 * (%0 if not limited)
729 *
730 * Allocates a tunnel between @in and @out that is capable of tunneling
731 * Display Port traffic.
732 *
733 * Return: Returns a tb_tunnel on success or NULL on failure.
734 */
735 struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
736 struct tb_port *out, int max_up,
737 int max_down)
738 {
739 struct tb_tunnel *tunnel;
740 struct tb_path **paths;
741 struct tb_path *path;
742
743 if (WARN_ON(!in->cap_adap || !out->cap_adap))
744 return NULL;
745
746 tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP);
747 if (!tunnel)
748 return NULL;
749
750 tunnel->init = tb_dp_xchg_caps;
751 tunnel->activate = tb_dp_activate;
752 tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;
753 tunnel->src_port = in;
754 tunnel->dst_port = out;
755 tunnel->max_up = max_up;
756 tunnel->max_down = max_down;
757
758 paths = tunnel->paths;
759
760 path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID,
761 1, "Video");
762 if (!path)
763 goto err_free;
764 tb_dp_init_video_path(path, false);
765 paths[TB_DP_VIDEO_PATH_OUT] = path;
766
767 path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out,
768 TB_DP_AUX_TX_HOPID, 1, "AUX TX");
769 if (!path)
770 goto err_free;
771 tb_dp_init_aux_path(path);
772 paths[TB_DP_AUX_PATH_OUT] = path;
773
774 path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in,
775 TB_DP_AUX_RX_HOPID, 1, "AUX RX");
776 if (!path)
777 goto err_free;
778 tb_dp_init_aux_path(path);
779 paths[TB_DP_AUX_PATH_IN] = path;
780
781 return tunnel;
782
783 err_free:
784 tb_tunnel_free(tunnel);
785 return NULL;
786 }
787
788 static u32 tb_dma_credits(struct tb_port *nhi)
789 {
790 u32 max_credits;
791
792 max_credits = (nhi->config.nfc_credits & ADP_CS_4_TOTAL_BUFFERS_MASK) >>
793 ADP_CS_4_TOTAL_BUFFERS_SHIFT;
794 return min(max_credits, 13U);
795 }
796
797 static int tb_dma_activate(struct tb_tunnel *tunnel, bool active)
798 {
799 struct tb_port *nhi = tunnel->src_port;
800 u32 credits;
801
802 credits = active ? tb_dma_credits(nhi) : 0;
803 return tb_port_set_initial_credits(nhi, credits);
804 }
805
806 static void tb_dma_init_path(struct tb_path *path, unsigned int isb,
807 unsigned int efc, u32 credits)
808 {
809 int i;
810
811 path->egress_fc_enable = efc;
812 path->ingress_fc_enable = TB_PATH_ALL;
813 path->egress_shared_buffer = TB_PATH_NONE;
814 path->ingress_shared_buffer = isb;
815 path->priority = 5;
816 path->weight = 1;
817 path->clear_fc = true;
818
819 for (i = 0; i < path->path_length; i++)
820 path->hops[i].initial_credits = credits;
821 }
822
823 /**
824 * tb_tunnel_alloc_dma() - allocate a DMA tunnel
825 * @tb: Pointer to the domain structure
826 * @nhi: Host controller port
827 * @dst: Destination null port which the other domain is connected to
828 * @transmit_ring: NHI ring number used to send packets towards the
829 * other domain. Set to %0 if TX path is not needed.
830 * @transmit_path: HopID used for transmitting packets
831 * @receive_ring: NHI ring number used to receive packets from the
832 * other domain. Set to %0 if RX path is not needed.
833 * @reveive_path: HopID used for receiving packets
834 *
835 * Return: Returns a tb_tunnel on success or NULL on failure.
836 */
837 struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
838 struct tb_port *dst, int transmit_ring,
839 int transmit_path, int receive_ring,
840 int receive_path)
841 {
842 struct tb_tunnel *tunnel;
843 size_t npaths = 0, i = 0;
844 struct tb_path *path;
845 u32 credits;
846
847 if (receive_ring)
848 npaths++;
849 if (transmit_ring)
850 npaths++;
851
852 if (WARN_ON(!npaths))
853 return NULL;
854
855 tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA);
856 if (!tunnel)
857 return NULL;
858
859 tunnel->activate = tb_dma_activate;
860 tunnel->src_port = nhi;
861 tunnel->dst_port = dst;
862
863 credits = tb_dma_credits(nhi);
864
865 if (receive_ring) {
866 path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0,
867 "DMA RX");
868 if (!path) {
869 tb_tunnel_free(tunnel);
870 return NULL;
871 }
872 tb_dma_init_path(path, TB_PATH_NONE, TB_PATH_SOURCE | TB_PATH_INTERNAL,
873 credits);
874 tunnel->paths[i++] = path;
875 }
876
877 if (transmit_ring) {
878 path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0,
879 "DMA TX");
880 if (!path) {
881 tb_tunnel_free(tunnel);
882 return NULL;
883 }
884 tb_dma_init_path(path, TB_PATH_SOURCE, TB_PATH_ALL, credits);
885 tunnel->paths[i++] = path;
886 }
887
888 return tunnel;
889 }
890
891 static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down)
892 {
893 int ret, up_max_rate, down_max_rate;
894
895 ret = usb4_usb3_port_max_link_rate(up);
896 if (ret < 0)
897 return ret;
898 up_max_rate = ret;
899
900 ret = usb4_usb3_port_max_link_rate(down);
901 if (ret < 0)
902 return ret;
903 down_max_rate = ret;
904
905 return min(up_max_rate, down_max_rate);
906 }
907
908 static int tb_usb3_init(struct tb_tunnel *tunnel)
909 {
910 tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n",
911 tunnel->allocated_up, tunnel->allocated_down);
912
913 return usb4_usb3_port_allocate_bandwidth(tunnel->src_port,
914 &tunnel->allocated_up,
915 &tunnel->allocated_down);
916 }
917
918 static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate)
919 {
920 int res;
921
922 res = tb_usb3_port_enable(tunnel->src_port, activate);
923 if (res)
924 return res;
925
926 if (tb_port_is_usb3_up(tunnel->dst_port))
927 return tb_usb3_port_enable(tunnel->dst_port, activate);
928
929 return 0;
930 }
931
932 static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel,
933 int *consumed_up, int *consumed_down)
934 {
935 /*
936 * PCIe tunneling affects the USB3 bandwidth so take that it
937 * into account here.
938 */
939 *consumed_up = tunnel->allocated_up * (3 + 1) / 3;
940 *consumed_down = tunnel->allocated_down * (3 + 1) / 3;
941 return 0;
942 }
943
944 static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel)
945 {
946 int ret;
947
948 ret = usb4_usb3_port_release_bandwidth(tunnel->src_port,
949 &tunnel->allocated_up,
950 &tunnel->allocated_down);
951 if (ret)
952 return ret;
953
954 tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n",
955 tunnel->allocated_up, tunnel->allocated_down);
956 return 0;
957 }
958
959 static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
960 int *available_up,
961 int *available_down)
962 {
963 int ret, max_rate, allocate_up, allocate_down;
964
965 ret = usb4_usb3_port_actual_link_rate(tunnel->src_port);
966 if (ret < 0) {
967 tb_tunnel_warn(tunnel, "failed to read actual link rate\n");
968 return;
969 } else if (!ret) {
970 /* Use maximum link rate if the link valid is not set */
971 ret = usb4_usb3_port_max_link_rate(tunnel->src_port);
972 if (ret < 0) {
973 tb_tunnel_warn(tunnel, "failed to read maximum link rate\n");
974 return;
975 }
976 }
977
978 /*
979 * 90% of the max rate can be allocated for isochronous
980 * transfers.
981 */
982 max_rate = ret * 90 / 100;
983
984 /* No need to reclaim if already at maximum */
985 if (tunnel->allocated_up >= max_rate &&
986 tunnel->allocated_down >= max_rate)
987 return;
988
989 /* Don't go lower than what is already allocated */
990 allocate_up = min(max_rate, *available_up);
991 if (allocate_up < tunnel->allocated_up)
992 allocate_up = tunnel->allocated_up;
993
994 allocate_down = min(max_rate, *available_down);
995 if (allocate_down < tunnel->allocated_down)
996 allocate_down = tunnel->allocated_down;
997
998 /* If no changes no need to do more */
999 if (allocate_up == tunnel->allocated_up &&
1000 allocate_down == tunnel->allocated_down)
1001 return;
1002
1003 ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up,
1004 &allocate_down);
1005 if (ret) {
1006 tb_tunnel_info(tunnel, "failed to allocate bandwidth\n");
1007 return;
1008 }
1009
1010 tunnel->allocated_up = allocate_up;
1011 *available_up -= tunnel->allocated_up;
1012
1013 tunnel->allocated_down = allocate_down;
1014 *available_down -= tunnel->allocated_down;
1015
1016 tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n",
1017 tunnel->allocated_up, tunnel->allocated_down);
1018 }
1019
1020 static void tb_usb3_init_path(struct tb_path *path)
1021 {
1022 path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
1023 path->egress_shared_buffer = TB_PATH_NONE;
1024 path->ingress_fc_enable = TB_PATH_ALL;
1025 path->ingress_shared_buffer = TB_PATH_NONE;
1026 path->priority = 3;
1027 path->weight = 3;
1028 path->drop_packages = 0;
1029 path->nfc_credits = 0;
1030 path->hops[0].initial_credits = 7;
1031 if (path->path_length > 1)
1032 path->hops[1].initial_credits =
1033 tb_initial_credits(path->hops[1].in_port->sw);
1034 }
1035
1036 /**
1037 * tb_tunnel_discover_usb3() - Discover existing USB3 tunnels
1038 * @tb: Pointer to the domain structure
1039 * @down: USB3 downstream adapter
1040 *
1041 * If @down adapter is active, follows the tunnel to the USB3 upstream
1042 * adapter and back. Returns the discovered tunnel or %NULL if there was
1043 * no tunnel.
1044 */
1045 struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down)
1046 {
1047 struct tb_tunnel *tunnel;
1048 struct tb_path *path;
1049
1050 if (!tb_usb3_port_is_enabled(down))
1051 return NULL;
1052
1053 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);
1054 if (!tunnel)
1055 return NULL;
1056
1057 tunnel->activate = tb_usb3_activate;
1058 tunnel->src_port = down;
1059
1060 /*
1061 * Discover both paths even if they are not complete. We will
1062 * clean them up by calling tb_tunnel_deactivate() below in that
1063 * case.
1064 */
1065 path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1,
1066 &tunnel->dst_port, "USB3 Down");
1067 if (!path) {
1068 /* Just disable the downstream port */
1069 tb_usb3_port_enable(down, false);
1070 goto err_free;
1071 }
1072 tunnel->paths[TB_USB3_PATH_DOWN] = path;
1073 tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]);
1074
1075 path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL,
1076 "USB3 Up");
1077 if (!path)
1078 goto err_deactivate;
1079 tunnel->paths[TB_USB3_PATH_UP] = path;
1080 tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]);
1081
1082 /* Validate that the tunnel is complete */
1083 if (!tb_port_is_usb3_up(tunnel->dst_port)) {
1084 tb_port_warn(tunnel->dst_port,
1085 "path does not end on an USB3 adapter, cleaning up\n");
1086 goto err_deactivate;
1087 }
1088
1089 if (down != tunnel->src_port) {
1090 tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n");
1091 goto err_deactivate;
1092 }
1093
1094 if (!tb_usb3_port_is_enabled(tunnel->dst_port)) {
1095 tb_tunnel_warn(tunnel,
1096 "tunnel is not fully activated, cleaning up\n");
1097 goto err_deactivate;
1098 }
1099
1100 if (!tb_route(down->sw)) {
1101 int ret;
1102
1103 /*
1104 * Read the initial bandwidth allocation for the first
1105 * hop tunnel.
1106 */
1107 ret = usb4_usb3_port_allocated_bandwidth(down,
1108 &tunnel->allocated_up, &tunnel->allocated_down);
1109 if (ret)
1110 goto err_deactivate;
1111
1112 tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n",
1113 tunnel->allocated_up, tunnel->allocated_down);
1114
1115 tunnel->init = tb_usb3_init;
1116 tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;
1117 tunnel->release_unused_bandwidth =
1118 tb_usb3_release_unused_bandwidth;
1119 tunnel->reclaim_available_bandwidth =
1120 tb_usb3_reclaim_available_bandwidth;
1121 }
1122
1123 tb_tunnel_dbg(tunnel, "discovered\n");
1124 return tunnel;
1125
1126 err_deactivate:
1127 tb_tunnel_deactivate(tunnel);
1128 err_free:
1129 tb_tunnel_free(tunnel);
1130
1131 return NULL;
1132 }
1133
1134 /**
1135 * tb_tunnel_alloc_usb3() - allocate a USB3 tunnel
1136 * @tb: Pointer to the domain structure
1137 * @up: USB3 upstream adapter port
1138 * @down: USB3 downstream adapter port
1139 * @max_up: Maximum available upstream bandwidth for the USB3 tunnel (%0
1140 * if not limited).
1141 * @max_down: Maximum available downstream bandwidth for the USB3 tunnel
1142 * (%0 if not limited).
1143 *
1144 * Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and
1145 * @TB_TYPE_USB3_DOWN.
1146 *
1147 * Return: Returns a tb_tunnel on success or %NULL on failure.
1148 */
1149 struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
1150 struct tb_port *down, int max_up,
1151 int max_down)
1152 {
1153 struct tb_tunnel *tunnel;
1154 struct tb_path *path;
1155 int max_rate = 0;
1156
1157 /*
1158 * Check that we have enough bandwidth available for the new
1159 * USB3 tunnel.
1160 */
1161 if (max_up > 0 || max_down > 0) {
1162 max_rate = tb_usb3_max_link_rate(down, up);
1163 if (max_rate < 0)
1164 return NULL;
1165
1166 /* Only 90% can be allocated for USB3 isochronous transfers */
1167 max_rate = max_rate * 90 / 100;
1168 tb_port_dbg(up, "required bandwidth for USB3 tunnel %d Mb/s\n",
1169 max_rate);
1170
1171 if (max_rate > max_up || max_rate > max_down) {
1172 tb_port_warn(up, "not enough bandwidth for USB3 tunnel\n");
1173 return NULL;
1174 }
1175 }
1176
1177 tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);
1178 if (!tunnel)
1179 return NULL;
1180
1181 tunnel->activate = tb_usb3_activate;
1182 tunnel->src_port = down;
1183 tunnel->dst_port = up;
1184 tunnel->max_up = max_up;
1185 tunnel->max_down = max_down;
1186
1187 path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0,
1188 "USB3 Down");
1189 if (!path) {
1190 tb_tunnel_free(tunnel);
1191 return NULL;
1192 }
1193 tb_usb3_init_path(path);
1194 tunnel->paths[TB_USB3_PATH_DOWN] = path;
1195
1196 path = tb_path_alloc(tb, up, TB_USB3_HOPID, down, TB_USB3_HOPID, 0,
1197 "USB3 Up");
1198 if (!path) {
1199 tb_tunnel_free(tunnel);
1200 return NULL;
1201 }
1202 tb_usb3_init_path(path);
1203 tunnel->paths[TB_USB3_PATH_UP] = path;
1204
1205 if (!tb_route(down->sw)) {
1206 tunnel->allocated_up = max_rate;
1207 tunnel->allocated_down = max_rate;
1208
1209 tunnel->init = tb_usb3_init;
1210 tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;
1211 tunnel->release_unused_bandwidth =
1212 tb_usb3_release_unused_bandwidth;
1213 tunnel->reclaim_available_bandwidth =
1214 tb_usb3_reclaim_available_bandwidth;
1215 }
1216
1217 return tunnel;
1218 }
1219
1220 /**
1221 * tb_tunnel_free() - free a tunnel
1222 * @tunnel: Tunnel to be freed
1223 *
1224 * Frees a tunnel. The tunnel does not need to be deactivated.
1225 */
1226 void tb_tunnel_free(struct tb_tunnel *tunnel)
1227 {
1228 int i;
1229
1230 if (!tunnel)
1231 return;
1232
1233 for (i = 0; i < tunnel->npaths; i++) {
1234 if (tunnel->paths[i])
1235 tb_path_free(tunnel->paths[i]);
1236 }
1237
1238 kfree(tunnel->paths);
1239 kfree(tunnel);
1240 }
1241
1242 /**
1243 * tb_tunnel_is_invalid - check whether an activated path is still valid
1244 * @tunnel: Tunnel to check
1245 */
1246 bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel)
1247 {
1248 int i;
1249
1250 for (i = 0; i < tunnel->npaths; i++) {
1251 WARN_ON(!tunnel->paths[i]->activated);
1252 if (tb_path_is_invalid(tunnel->paths[i]))
1253 return true;
1254 }
1255
1256 return false;
1257 }
1258
1259 /**
1260 * tb_tunnel_restart() - activate a tunnel after a hardware reset
1261 * @tunnel: Tunnel to restart
1262 *
1263 * Return: 0 on success and negative errno in case if failure
1264 */
1265 int tb_tunnel_restart(struct tb_tunnel *tunnel)
1266 {
1267 int res, i;
1268
1269 tb_tunnel_dbg(tunnel, "activating\n");
1270
1271 /*
1272 * Make sure all paths are properly disabled before enabling
1273 * them again.
1274 */
1275 for (i = 0; i < tunnel->npaths; i++) {
1276 if (tunnel->paths[i]->activated) {
1277 tb_path_deactivate(tunnel->paths[i]);
1278 tunnel->paths[i]->activated = false;
1279 }
1280 }
1281
1282 if (tunnel->init) {
1283 res = tunnel->init(tunnel);
1284 if (res)
1285 return res;
1286 }
1287
1288 for (i = 0; i < tunnel->npaths; i++) {
1289 res = tb_path_activate(tunnel->paths[i]);
1290 if (res)
1291 goto err;
1292 }
1293
1294 if (tunnel->activate) {
1295 res = tunnel->activate(tunnel, true);
1296 if (res)
1297 goto err;
1298 }
1299
1300 return 0;
1301
1302 err:
1303 tb_tunnel_warn(tunnel, "activation failed\n");
1304 tb_tunnel_deactivate(tunnel);
1305 return res;
1306 }
1307
1308 /**
1309 * tb_tunnel_activate() - activate a tunnel
1310 * @tunnel: Tunnel to activate
1311 *
1312 * Return: Returns 0 on success or an error code on failure.
1313 */
1314 int tb_tunnel_activate(struct tb_tunnel *tunnel)
1315 {
1316 int i;
1317
1318 for (i = 0; i < tunnel->npaths; i++) {
1319 if (tunnel->paths[i]->activated) {
1320 tb_tunnel_WARN(tunnel,
1321 "trying to activate an already activated tunnel\n");
1322 return -EINVAL;
1323 }
1324 }
1325
1326 return tb_tunnel_restart(tunnel);
1327 }
1328
1329 /**
1330 * tb_tunnel_deactivate() - deactivate a tunnel
1331 * @tunnel: Tunnel to deactivate
1332 */
1333 void tb_tunnel_deactivate(struct tb_tunnel *tunnel)
1334 {
1335 int i;
1336
1337 tb_tunnel_dbg(tunnel, "deactivating\n");
1338
1339 if (tunnel->activate)
1340 tunnel->activate(tunnel, false);
1341
1342 for (i = 0; i < tunnel->npaths; i++) {
1343 if (tunnel->paths[i] && tunnel->paths[i]->activated)
1344 tb_path_deactivate(tunnel->paths[i]);
1345 }
1346 }
1347
1348 /**
1349 * tb_tunnel_port_on_path() - Does the tunnel go through port
1350 * @tunnel: Tunnel to check
1351 * @port: Port to check
1352 *
1353 * Returns true if @tunnel goes through @port (direction does not matter),
1354 * false otherwise.
1355 */
1356 bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
1357 const struct tb_port *port)
1358 {
1359 int i;
1360
1361 for (i = 0; i < tunnel->npaths; i++) {
1362 if (!tunnel->paths[i])
1363 continue;
1364
1365 if (tb_path_port_on_path(tunnel->paths[i], port))
1366 return true;
1367 }
1368
1369 return false;
1370 }
1371
1372 static bool tb_tunnel_is_active(const struct tb_tunnel *tunnel)
1373 {
1374 int i;
1375
1376 for (i = 0; i < tunnel->npaths; i++) {
1377 if (!tunnel->paths[i])
1378 return false;
1379 if (!tunnel->paths[i]->activated)
1380 return false;
1381 }
1382
1383 return true;
1384 }
1385
1386 /**
1387 * tb_tunnel_consumed_bandwidth() - Return bandwidth consumed by the tunnel
1388 * @tunnel: Tunnel to check
1389 * @consumed_up: Consumed bandwidth in Mb/s from @dst_port to @src_port.
1390 * Can be %NULL.
1391 * @consumed_down: Consumed bandwidth in Mb/s from @src_port to @dst_port.
1392 * Can be %NULL.
1393 *
1394 * Stores the amount of isochronous bandwidth @tunnel consumes in
1395 * @consumed_up and @consumed_down. In case of success returns %0,
1396 * negative errno otherwise.
1397 */
1398 int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
1399 int *consumed_down)
1400 {
1401 int up_bw = 0, down_bw = 0;
1402
1403 if (!tb_tunnel_is_active(tunnel))
1404 goto out;
1405
1406 if (tunnel->consumed_bandwidth) {
1407 int ret;
1408
1409 ret = tunnel->consumed_bandwidth(tunnel, &up_bw, &down_bw);
1410 if (ret)
1411 return ret;
1412
1413 tb_tunnel_dbg(tunnel, "consumed bandwidth %d/%d Mb/s\n", up_bw,
1414 down_bw);
1415 }
1416
1417 out:
1418 if (consumed_up)
1419 *consumed_up = up_bw;
1420 if (consumed_down)
1421 *consumed_down = down_bw;
1422
1423 return 0;
1424 }
1425
1426 /**
1427 * tb_tunnel_release_unused_bandwidth() - Release unused bandwidth
1428 * @tunnel: Tunnel whose unused bandwidth to release
1429 *
1430 * If tunnel supports dynamic bandwidth management (USB3 tunnels at the
1431 * moment) this function makes it to release all the unused bandwidth.
1432 *
1433 * Returns %0 in case of success and negative errno otherwise.
1434 */
1435 int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel)
1436 {
1437 if (!tb_tunnel_is_active(tunnel))
1438 return 0;
1439
1440 if (tunnel->release_unused_bandwidth) {
1441 int ret;
1442
1443 ret = tunnel->release_unused_bandwidth(tunnel);
1444 if (ret)
1445 return ret;
1446 }
1447
1448 return 0;
1449 }
1450
1451 /**
1452 * tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth
1453 * @tunnel: Tunnel reclaiming available bandwidth
1454 * @available_up: Available upstream bandwidth (in Mb/s)
1455 * @available_down: Available downstream bandwidth (in Mb/s)
1456 *
1457 * Reclaims bandwidth from @available_up and @available_down and updates
1458 * the variables accordingly (e.g decreases both according to what was
1459 * reclaimed by the tunnel). If nothing was reclaimed the values are
1460 * kept as is.
1461 */
1462 void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
1463 int *available_up,
1464 int *available_down)
1465 {
1466 if (!tb_tunnel_is_active(tunnel))
1467 return;
1468
1469 if (tunnel->reclaim_available_bandwidth)
1470 tunnel->reclaim_available_bandwidth(tunnel, available_up,
1471 available_down);
1472 }
Linux with added FPC-III support