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