Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
3364f0c1 | 2 | /* |
93f36ade | 3 | * Thunderbolt driver - Tunneling support |
3364f0c1 AN |
4 | * |
5 | * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> | |
93f36ade | 6 | * Copyright (C) 2019, Intel Corporation |
3364f0c1 AN |
7 | */ |
8 | ||
de718ac7 | 9 | #include <linux/delay.h> |
3364f0c1 AN |
10 | #include <linux/slab.h> |
11 | #include <linux/list.h> | |
6ce35635 | 12 | #include <linux/ktime.h> |
6e19d48e | 13 | #include <linux/string_helpers.h> |
3364f0c1 | 14 | |
1752b9f7 | 15 | #include "tunnel.h" |
3364f0c1 AN |
16 | #include "tb.h" |
17 | ||
8c7acaaf MW |
18 | /* PCIe adapters use always HopID of 8 for both directions */ |
19 | #define TB_PCI_HOPID 8 | |
20 | ||
93f36ade MW |
21 | #define TB_PCI_PATH_DOWN 0 |
22 | #define TB_PCI_PATH_UP 1 | |
23 | ||
f73edddf MW |
24 | #define TB_PCI_PRIORITY 3 |
25 | #define TB_PCI_WEIGHT 1 | |
26 | ||
e6f81858 RM |
27 | /* USB3 adapters use always HopID of 8 for both directions */ |
28 | #define TB_USB3_HOPID 8 | |
29 | ||
30 | #define TB_USB3_PATH_DOWN 0 | |
31 | #define TB_USB3_PATH_UP 1 | |
32 | ||
f73edddf | 33 | #define TB_USB3_PRIORITY 3 |
582e70b0 | 34 | #define TB_USB3_WEIGHT 2 |
f73edddf | 35 | |
4f807e47 MW |
36 | /* DP adapters use HopID 8 for AUX and 9 for Video */ |
37 | #define TB_DP_AUX_TX_HOPID 8 | |
38 | #define TB_DP_AUX_RX_HOPID 8 | |
39 | #define TB_DP_VIDEO_HOPID 9 | |
40 | ||
41 | #define TB_DP_VIDEO_PATH_OUT 0 | |
42 | #define TB_DP_AUX_PATH_OUT 1 | |
43 | #define TB_DP_AUX_PATH_IN 2 | |
44 | ||
f73edddf MW |
45 | #define TB_DP_VIDEO_PRIORITY 1 |
46 | #define TB_DP_VIDEO_WEIGHT 1 | |
47 | ||
48 | #define TB_DP_AUX_PRIORITY 2 | |
49 | #define TB_DP_AUX_WEIGHT 1 | |
50 | ||
6ed541c5 MW |
51 | /* Minimum number of credits needed for PCIe path */ |
52 | #define TB_MIN_PCIE_CREDITS 6U | |
53 | /* | |
54 | * Number of credits we try to allocate for each DMA path if not limited | |
55 | * by the host router baMaxHI. | |
56 | */ | |
7ee20d0a | 57 | #define TB_DMA_CREDITS 14 |
6ed541c5 | 58 | /* Minimum number of credits for DMA path */ |
7ee20d0a MW |
59 | #define TB_MIN_DMA_CREDITS 1 |
60 | ||
f73edddf MW |
61 | #define TB_DMA_PRIORITY 5 |
62 | #define TB_DMA_WEIGHT 1 | |
63 | ||
582e70b0 GF |
64 | /* |
65 | * Reserve additional bandwidth for USB 3.x and PCIe bulk traffic | |
66 | * according to USB4 v2 Connection Manager guide. This ends up reserving | |
67 | * 1500 Mb/s for PCIe and 3000 Mb/s for USB 3.x taking weights into | |
68 | * account. | |
69 | */ | |
70 | #define USB4_V2_PCI_MIN_BANDWIDTH (1500 * TB_PCI_WEIGHT) | |
71 | #define USB4_V2_USB3_MIN_BANDWIDTH (1500 * TB_USB3_WEIGHT) | |
72 | ||
7ee20d0a MW |
73 | static unsigned int dma_credits = TB_DMA_CREDITS; |
74 | module_param(dma_credits, uint, 0444); | |
75 | MODULE_PARM_DESC(dma_credits, "specify custom credits for DMA tunnels (default: " | |
76 | __MODULE_STRING(TB_DMA_CREDITS) ")"); | |
6ed541c5 | 77 | |
6ce35635 MW |
78 | static bool bw_alloc_mode = true; |
79 | module_param(bw_alloc_mode, bool, 0444); | |
80 | MODULE_PARM_DESC(bw_alloc_mode, | |
81 | "enable bandwidth allocation mode if supported (default: true)"); | |
82 | ||
e6f81858 | 83 | static const char * const tb_tunnel_names[] = { "PCI", "DP", "DMA", "USB3" }; |
4f807e47 | 84 | |
6ed541c5 MW |
85 | static inline unsigned int tb_usable_credits(const struct tb_port *port) |
86 | { | |
87 | return port->total_credits - port->ctl_credits; | |
88 | } | |
89 | ||
90 | /** | |
91 | * tb_available_credits() - Available credits for PCIe and DMA | |
92 | * @port: Lane adapter to check | |
93 | * @max_dp_streams: If non-%NULL stores maximum number of simultaneous DP | |
94 | * streams possible through this lane adapter | |
95 | */ | |
96 | static unsigned int tb_available_credits(const struct tb_port *port, | |
97 | size_t *max_dp_streams) | |
98 | { | |
99 | const struct tb_switch *sw = port->sw; | |
100 | int credits, usb3, pcie, spare; | |
101 | size_t ndp; | |
102 | ||
103 | usb3 = tb_acpi_may_tunnel_usb3() ? sw->max_usb3_credits : 0; | |
104 | pcie = tb_acpi_may_tunnel_pcie() ? sw->max_pcie_credits : 0; | |
105 | ||
106 | if (tb_acpi_is_xdomain_allowed()) { | |
7ee20d0a | 107 | spare = min_not_zero(sw->max_dma_credits, dma_credits); |
6ed541c5 MW |
108 | /* Add some credits for potential second DMA tunnel */ |
109 | spare += TB_MIN_DMA_CREDITS; | |
110 | } else { | |
111 | spare = 0; | |
112 | } | |
113 | ||
114 | credits = tb_usable_credits(port); | |
115 | if (tb_acpi_may_tunnel_dp()) { | |
116 | /* | |
117 | * Maximum number of DP streams possible through the | |
118 | * lane adapter. | |
119 | */ | |
93bf344f GF |
120 | if (sw->min_dp_aux_credits + sw->min_dp_main_credits) |
121 | ndp = (credits - (usb3 + pcie + spare)) / | |
122 | (sw->min_dp_aux_credits + sw->min_dp_main_credits); | |
123 | else | |
124 | ndp = 0; | |
6ed541c5 MW |
125 | } else { |
126 | ndp = 0; | |
127 | } | |
128 | credits -= ndp * (sw->min_dp_aux_credits + sw->min_dp_main_credits); | |
129 | credits -= usb3; | |
130 | ||
131 | if (max_dp_streams) | |
132 | *max_dp_streams = ndp; | |
133 | ||
134 | return credits > 0 ? credits : 0; | |
135 | } | |
136 | ||
ce91d793 MW |
137 | static void tb_init_pm_support(struct tb_path_hop *hop) |
138 | { | |
139 | struct tb_port *out_port = hop->out_port; | |
140 | struct tb_port *in_port = hop->in_port; | |
141 | ||
142 | if (tb_port_is_null(in_port) && tb_port_is_null(out_port) && | |
143 | usb4_switch_version(in_port->sw) >= 2) | |
144 | hop->pm_support = true; | |
145 | } | |
146 | ||
4f807e47 MW |
147 | static struct tb_tunnel *tb_tunnel_alloc(struct tb *tb, size_t npaths, |
148 | enum tb_tunnel_type type) | |
93f36ade MW |
149 | { |
150 | struct tb_tunnel *tunnel; | |
151 | ||
152 | tunnel = kzalloc(sizeof(*tunnel), GFP_KERNEL); | |
153 | if (!tunnel) | |
154 | return NULL; | |
155 | ||
156 | tunnel->paths = kcalloc(npaths, sizeof(tunnel->paths[0]), GFP_KERNEL); | |
157 | if (!tunnel->paths) { | |
158 | tb_tunnel_free(tunnel); | |
159 | return NULL; | |
160 | } | |
161 | ||
162 | INIT_LIST_HEAD(&tunnel->list); | |
163 | tunnel->tb = tb; | |
164 | tunnel->npaths = npaths; | |
4f807e47 | 165 | tunnel->type = type; |
93f36ade MW |
166 | |
167 | return tunnel; | |
168 | } | |
169 | ||
6e19d48e GF |
170 | static int tb_pci_set_ext_encapsulation(struct tb_tunnel *tunnel, bool enable) |
171 | { | |
582e70b0 | 172 | struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw); |
6e19d48e GF |
173 | int ret; |
174 | ||
175 | /* Only supported of both routers are at least USB4 v2 */ | |
2b3a6239 GF |
176 | if ((usb4_switch_version(tunnel->src_port->sw) < 2) || |
177 | (usb4_switch_version(tunnel->dst_port->sw) < 2)) | |
178 | return 0; | |
179 | ||
180 | if (enable && tb_port_get_link_generation(port) < 4) | |
6e19d48e GF |
181 | return 0; |
182 | ||
183 | ret = usb4_pci_port_set_ext_encapsulation(tunnel->src_port, enable); | |
184 | if (ret) | |
185 | return ret; | |
186 | ||
2b3a6239 GF |
187 | /* |
188 | * Downstream router could be unplugged so disable of encapsulation | |
189 | * in upstream router is still possible. | |
190 | */ | |
6e19d48e | 191 | ret = usb4_pci_port_set_ext_encapsulation(tunnel->dst_port, enable); |
2b3a6239 GF |
192 | if (ret) { |
193 | if (enable) | |
194 | return ret; | |
195 | if (ret != -ENODEV) | |
196 | return ret; | |
197 | } | |
6e19d48e GF |
198 | |
199 | tb_tunnel_dbg(tunnel, "extended encapsulation %s\n", | |
200 | str_enabled_disabled(enable)); | |
201 | return 0; | |
202 | } | |
203 | ||
93f36ade MW |
204 | static int tb_pci_activate(struct tb_tunnel *tunnel, bool activate) |
205 | { | |
206 | int res; | |
207 | ||
6e19d48e GF |
208 | if (activate) { |
209 | res = tb_pci_set_ext_encapsulation(tunnel, activate); | |
210 | if (res) | |
211 | return res; | |
212 | } | |
213 | ||
54967f41 GF |
214 | if (activate) |
215 | res = tb_pci_port_enable(tunnel->dst_port, activate); | |
216 | else | |
217 | res = tb_pci_port_enable(tunnel->src_port, activate); | |
93f36ade MW |
218 | if (res) |
219 | return res; | |
220 | ||
54967f41 GF |
221 | |
222 | if (activate) { | |
223 | res = tb_pci_port_enable(tunnel->src_port, activate); | |
6e19d48e GF |
224 | if (res) |
225 | return res; | |
54967f41 GF |
226 | } else { |
227 | /* Downstream router could be unplugged */ | |
228 | tb_pci_port_enable(tunnel->dst_port, activate); | |
6e19d48e | 229 | } |
0414bec5 | 230 | |
6e19d48e | 231 | return activate ? 0 : tb_pci_set_ext_encapsulation(tunnel, activate); |
93f36ade MW |
232 | } |
233 | ||
6ed541c5 | 234 | static int tb_pci_init_credits(struct tb_path_hop *hop) |
91c0c120 | 235 | { |
6ed541c5 MW |
236 | struct tb_port *port = hop->in_port; |
237 | struct tb_switch *sw = port->sw; | |
238 | unsigned int credits; | |
239 | ||
240 | if (tb_port_use_credit_allocation(port)) { | |
241 | unsigned int available; | |
242 | ||
243 | available = tb_available_credits(port, NULL); | |
244 | credits = min(sw->max_pcie_credits, available); | |
245 | ||
246 | if (credits < TB_MIN_PCIE_CREDITS) | |
247 | return -ENOSPC; | |
248 | ||
249 | credits = max(TB_MIN_PCIE_CREDITS, credits); | |
250 | } else { | |
251 | if (tb_port_is_null(port)) | |
252 | credits = port->bonded ? 32 : 16; | |
253 | else | |
254 | credits = 7; | |
91c0c120 MW |
255 | } |
256 | ||
6ed541c5 MW |
257 | hop->initial_credits = credits; |
258 | return 0; | |
91c0c120 MW |
259 | } |
260 | ||
6ed541c5 | 261 | static int tb_pci_init_path(struct tb_path *path) |
3364f0c1 | 262 | { |
6ed541c5 MW |
263 | struct tb_path_hop *hop; |
264 | ||
3364f0c1 AN |
265 | path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; |
266 | path->egress_shared_buffer = TB_PATH_NONE; | |
267 | path->ingress_fc_enable = TB_PATH_ALL; | |
268 | path->ingress_shared_buffer = TB_PATH_NONE; | |
f73edddf MW |
269 | path->priority = TB_PCI_PRIORITY; |
270 | path->weight = TB_PCI_WEIGHT; | |
3364f0c1 | 271 | path->drop_packages = 0; |
6ed541c5 MW |
272 | |
273 | tb_path_for_each_hop(path, hop) { | |
274 | int ret; | |
275 | ||
276 | ret = tb_pci_init_credits(hop); | |
277 | if (ret) | |
278 | return ret; | |
279 | } | |
280 | ||
281 | return 0; | |
0414bec5 MW |
282 | } |
283 | ||
284 | /** | |
285 | * tb_tunnel_discover_pci() - Discover existing PCIe tunnels | |
286 | * @tb: Pointer to the domain structure | |
287 | * @down: PCIe downstream adapter | |
43bddb26 | 288 | * @alloc_hopid: Allocate HopIDs from visited ports |
0414bec5 MW |
289 | * |
290 | * If @down adapter is active, follows the tunnel to the PCIe upstream | |
291 | * adapter and back. Returns the discovered tunnel or %NULL if there was | |
292 | * no tunnel. | |
293 | */ | |
43bddb26 MW |
294 | struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down, |
295 | bool alloc_hopid) | |
0414bec5 MW |
296 | { |
297 | struct tb_tunnel *tunnel; | |
298 | struct tb_path *path; | |
299 | ||
300 | if (!tb_pci_port_is_enabled(down)) | |
301 | return NULL; | |
302 | ||
4f807e47 | 303 | tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI); |
0414bec5 MW |
304 | if (!tunnel) |
305 | return NULL; | |
306 | ||
307 | tunnel->activate = tb_pci_activate; | |
308 | tunnel->src_port = down; | |
309 | ||
310 | /* | |
311 | * Discover both paths even if they are not complete. We will | |
312 | * clean them up by calling tb_tunnel_deactivate() below in that | |
313 | * case. | |
314 | */ | |
315 | path = tb_path_discover(down, TB_PCI_HOPID, NULL, -1, | |
43bddb26 | 316 | &tunnel->dst_port, "PCIe Up", alloc_hopid); |
0414bec5 MW |
317 | if (!path) { |
318 | /* Just disable the downstream port */ | |
319 | tb_pci_port_enable(down, false); | |
320 | goto err_free; | |
321 | } | |
322 | tunnel->paths[TB_PCI_PATH_UP] = path; | |
6ed541c5 MW |
323 | if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_UP])) |
324 | goto err_free; | |
0414bec5 MW |
325 | |
326 | path = tb_path_discover(tunnel->dst_port, -1, down, TB_PCI_HOPID, NULL, | |
43bddb26 | 327 | "PCIe Down", alloc_hopid); |
0414bec5 MW |
328 | if (!path) |
329 | goto err_deactivate; | |
330 | tunnel->paths[TB_PCI_PATH_DOWN] = path; | |
6ed541c5 MW |
331 | if (tb_pci_init_path(tunnel->paths[TB_PCI_PATH_DOWN])) |
332 | goto err_deactivate; | |
0414bec5 MW |
333 | |
334 | /* Validate that the tunnel is complete */ | |
335 | if (!tb_port_is_pcie_up(tunnel->dst_port)) { | |
336 | tb_port_warn(tunnel->dst_port, | |
337 | "path does not end on a PCIe adapter, cleaning up\n"); | |
338 | goto err_deactivate; | |
339 | } | |
340 | ||
341 | if (down != tunnel->src_port) { | |
342 | tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); | |
343 | goto err_deactivate; | |
344 | } | |
345 | ||
346 | if (!tb_pci_port_is_enabled(tunnel->dst_port)) { | |
347 | tb_tunnel_warn(tunnel, | |
348 | "tunnel is not fully activated, cleaning up\n"); | |
349 | goto err_deactivate; | |
350 | } | |
351 | ||
352 | tb_tunnel_dbg(tunnel, "discovered\n"); | |
353 | return tunnel; | |
354 | ||
355 | err_deactivate: | |
356 | tb_tunnel_deactivate(tunnel); | |
357 | err_free: | |
358 | tb_tunnel_free(tunnel); | |
359 | ||
360 | return NULL; | |
3364f0c1 AN |
361 | } |
362 | ||
363 | /** | |
93f36ade MW |
364 | * tb_tunnel_alloc_pci() - allocate a pci tunnel |
365 | * @tb: Pointer to the domain structure | |
366 | * @up: PCIe upstream adapter port | |
367 | * @down: PCIe downstream adapter port | |
3364f0c1 AN |
368 | * |
369 | * Allocate a PCI tunnel. The ports must be of type TB_TYPE_PCIE_UP and | |
370 | * TB_TYPE_PCIE_DOWN. | |
371 | * | |
93f36ade | 372 | * Return: Returns a tb_tunnel on success or NULL on failure. |
3364f0c1 | 373 | */ |
93f36ade MW |
374 | struct tb_tunnel *tb_tunnel_alloc_pci(struct tb *tb, struct tb_port *up, |
375 | struct tb_port *down) | |
3364f0c1 | 376 | { |
93f36ade | 377 | struct tb_tunnel *tunnel; |
8c7acaaf | 378 | struct tb_path *path; |
93f36ade | 379 | |
4f807e47 | 380 | tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_PCI); |
3364f0c1 | 381 | if (!tunnel) |
93f36ade | 382 | return NULL; |
3364f0c1 | 383 | |
93f36ade MW |
384 | tunnel->activate = tb_pci_activate; |
385 | tunnel->src_port = down; | |
386 | tunnel->dst_port = up; | |
387 | ||
8c7acaaf MW |
388 | path = tb_path_alloc(tb, down, TB_PCI_HOPID, up, TB_PCI_HOPID, 0, |
389 | "PCIe Down"); | |
6ed541c5 MW |
390 | if (!path) |
391 | goto err_free; | |
ce19f91e | 392 | tunnel->paths[TB_PCI_PATH_DOWN] = path; |
6ed541c5 MW |
393 | if (tb_pci_init_path(path)) |
394 | goto err_free; | |
93f36ade | 395 | |
8c7acaaf MW |
396 | path = tb_path_alloc(tb, up, TB_PCI_HOPID, down, TB_PCI_HOPID, 0, |
397 | "PCIe Up"); | |
6ed541c5 MW |
398 | if (!path) |
399 | goto err_free; | |
ce19f91e | 400 | tunnel->paths[TB_PCI_PATH_UP] = path; |
6ed541c5 MW |
401 | if (tb_pci_init_path(path)) |
402 | goto err_free; | |
93f36ade MW |
403 | |
404 | return tunnel; | |
6ed541c5 MW |
405 | |
406 | err_free: | |
407 | tb_tunnel_free(tunnel); | |
408 | return NULL; | |
3364f0c1 AN |
409 | } |
410 | ||
582e70b0 GF |
411 | /** |
412 | * tb_tunnel_reserved_pci() - Amount of bandwidth to reserve for PCIe | |
413 | * @port: Lane 0 adapter | |
414 | * @reserved_up: Upstream bandwidth in Mb/s to reserve | |
415 | * @reserved_down: Downstream bandwidth in Mb/s to reserve | |
416 | * | |
417 | * Can be called to any connected lane 0 adapter to find out how much | |
418 | * bandwidth needs to be left in reserve for possible PCIe bulk traffic. | |
419 | * Returns true if there is something to be reserved and writes the | |
420 | * amount to @reserved_down/@reserved_up. Otherwise returns false and | |
421 | * does not touch the parameters. | |
422 | */ | |
423 | bool tb_tunnel_reserved_pci(struct tb_port *port, int *reserved_up, | |
424 | int *reserved_down) | |
425 | { | |
426 | if (WARN_ON_ONCE(!port->remote)) | |
427 | return false; | |
428 | ||
429 | if (!tb_acpi_may_tunnel_pcie()) | |
430 | return false; | |
431 | ||
432 | if (tb_port_get_link_generation(port) < 4) | |
433 | return false; | |
434 | ||
435 | /* Must have PCIe adapters */ | |
436 | if (tb_is_upstream_port(port)) { | |
437 | if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_UP)) | |
438 | return false; | |
439 | if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_DOWN)) | |
440 | return false; | |
441 | } else { | |
442 | if (!tb_switch_find_port(port->sw, TB_TYPE_PCIE_DOWN)) | |
443 | return false; | |
444 | if (!tb_switch_find_port(port->remote->sw, TB_TYPE_PCIE_UP)) | |
445 | return false; | |
446 | } | |
447 | ||
448 | *reserved_up = USB4_V2_PCI_MIN_BANDWIDTH; | |
449 | *reserved_down = USB4_V2_PCI_MIN_BANDWIDTH; | |
450 | ||
451 | tb_port_dbg(port, "reserving %u/%u Mb/s for PCIe\n", *reserved_up, | |
452 | *reserved_down); | |
453 | return true; | |
454 | } | |
455 | ||
b0407983 MW |
456 | static bool tb_dp_is_usb4(const struct tb_switch *sw) |
457 | { | |
458 | /* Titan Ridge DP adapters need the same treatment as USB4 */ | |
459 | return tb_switch_is_usb4(sw) || tb_switch_is_titan_ridge(sw); | |
460 | } | |
461 | ||
fe1a1cf7 MW |
462 | static int tb_dp_cm_handshake(struct tb_port *in, struct tb_port *out, |
463 | int timeout_msec) | |
de718ac7 | 464 | { |
fe1a1cf7 | 465 | ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec); |
de718ac7 MW |
466 | u32 val; |
467 | int ret; | |
468 | ||
469 | /* Both ends need to support this */ | |
b0407983 | 470 | if (!tb_dp_is_usb4(in->sw) || !tb_dp_is_usb4(out->sw)) |
de718ac7 MW |
471 | return 0; |
472 | ||
473 | ret = tb_port_read(out, &val, TB_CFG_PORT, | |
474 | out->cap_adap + DP_STATUS_CTRL, 1); | |
475 | if (ret) | |
476 | return ret; | |
477 | ||
478 | val |= DP_STATUS_CTRL_UF | DP_STATUS_CTRL_CMHS; | |
479 | ||
480 | ret = tb_port_write(out, &val, TB_CFG_PORT, | |
481 | out->cap_adap + DP_STATUS_CTRL, 1); | |
482 | if (ret) | |
483 | return ret; | |
484 | ||
485 | do { | |
486 | ret = tb_port_read(out, &val, TB_CFG_PORT, | |
487 | out->cap_adap + DP_STATUS_CTRL, 1); | |
488 | if (ret) | |
489 | return ret; | |
490 | if (!(val & DP_STATUS_CTRL_CMHS)) | |
491 | return 0; | |
fe1a1cf7 MW |
492 | usleep_range(100, 150); |
493 | } while (ktime_before(ktime_get(), timeout)); | |
de718ac7 MW |
494 | |
495 | return -ETIMEDOUT; | |
496 | } | |
497 | ||
2d7e0472 MW |
498 | /* |
499 | * Returns maximum possible rate from capability supporting only DP 2.0 | |
500 | * and below. Used when DP BW allocation mode is not enabled. | |
501 | */ | |
a11b88ad MW |
502 | static inline u32 tb_dp_cap_get_rate(u32 val) |
503 | { | |
504 | u32 rate = (val & DP_COMMON_CAP_RATE_MASK) >> DP_COMMON_CAP_RATE_SHIFT; | |
505 | ||
506 | switch (rate) { | |
507 | case DP_COMMON_CAP_RATE_RBR: | |
508 | return 1620; | |
509 | case DP_COMMON_CAP_RATE_HBR: | |
510 | return 2700; | |
511 | case DP_COMMON_CAP_RATE_HBR2: | |
512 | return 5400; | |
513 | case DP_COMMON_CAP_RATE_HBR3: | |
514 | return 8100; | |
515 | default: | |
516 | return 0; | |
517 | } | |
518 | } | |
519 | ||
2d7e0472 MW |
520 | /* |
521 | * Returns maximum possible rate from capability supporting DP 2.1 | |
522 | * UHBR20, 13.5 and 10 rates as well. Use only when DP BW allocation | |
523 | * mode is enabled. | |
524 | */ | |
525 | static inline u32 tb_dp_cap_get_rate_ext(u32 val) | |
526 | { | |
527 | if (val & DP_COMMON_CAP_UHBR20) | |
528 | return 20000; | |
529 | else if (val & DP_COMMON_CAP_UHBR13_5) | |
530 | return 13500; | |
531 | else if (val & DP_COMMON_CAP_UHBR10) | |
532 | return 10000; | |
533 | ||
534 | return tb_dp_cap_get_rate(val); | |
535 | } | |
536 | ||
537 | static inline bool tb_dp_is_uhbr_rate(unsigned int rate) | |
538 | { | |
539 | return rate >= 10000; | |
540 | } | |
541 | ||
a11b88ad MW |
542 | static inline u32 tb_dp_cap_set_rate(u32 val, u32 rate) |
543 | { | |
544 | val &= ~DP_COMMON_CAP_RATE_MASK; | |
545 | switch (rate) { | |
546 | default: | |
547 | WARN(1, "invalid rate %u passed, defaulting to 1620 MB/s\n", rate); | |
df561f66 | 548 | fallthrough; |
a11b88ad MW |
549 | case 1620: |
550 | val |= DP_COMMON_CAP_RATE_RBR << DP_COMMON_CAP_RATE_SHIFT; | |
551 | break; | |
552 | case 2700: | |
553 | val |= DP_COMMON_CAP_RATE_HBR << DP_COMMON_CAP_RATE_SHIFT; | |
554 | break; | |
555 | case 5400: | |
556 | val |= DP_COMMON_CAP_RATE_HBR2 << DP_COMMON_CAP_RATE_SHIFT; | |
557 | break; | |
558 | case 8100: | |
559 | val |= DP_COMMON_CAP_RATE_HBR3 << DP_COMMON_CAP_RATE_SHIFT; | |
560 | break; | |
561 | } | |
562 | return val; | |
563 | } | |
564 | ||
565 | static inline u32 tb_dp_cap_get_lanes(u32 val) | |
566 | { | |
567 | u32 lanes = (val & DP_COMMON_CAP_LANES_MASK) >> DP_COMMON_CAP_LANES_SHIFT; | |
568 | ||
569 | switch (lanes) { | |
570 | case DP_COMMON_CAP_1_LANE: | |
571 | return 1; | |
572 | case DP_COMMON_CAP_2_LANES: | |
573 | return 2; | |
574 | case DP_COMMON_CAP_4_LANES: | |
575 | return 4; | |
576 | default: | |
577 | return 0; | |
578 | } | |
579 | } | |
580 | ||
581 | static inline u32 tb_dp_cap_set_lanes(u32 val, u32 lanes) | |
582 | { | |
583 | val &= ~DP_COMMON_CAP_LANES_MASK; | |
584 | switch (lanes) { | |
585 | default: | |
586 | WARN(1, "invalid number of lanes %u passed, defaulting to 1\n", | |
587 | lanes); | |
df561f66 | 588 | fallthrough; |
a11b88ad MW |
589 | case 1: |
590 | val |= DP_COMMON_CAP_1_LANE << DP_COMMON_CAP_LANES_SHIFT; | |
591 | break; | |
592 | case 2: | |
593 | val |= DP_COMMON_CAP_2_LANES << DP_COMMON_CAP_LANES_SHIFT; | |
594 | break; | |
595 | case 4: | |
596 | val |= DP_COMMON_CAP_4_LANES << DP_COMMON_CAP_LANES_SHIFT; | |
597 | break; | |
598 | } | |
599 | return val; | |
600 | } | |
601 | ||
602 | static unsigned int tb_dp_bandwidth(unsigned int rate, unsigned int lanes) | |
603 | { | |
2d7e0472 MW |
604 | /* Tunneling removes the DP 8b/10b 128/132b encoding */ |
605 | if (tb_dp_is_uhbr_rate(rate)) | |
606 | return rate * lanes * 128 / 132; | |
a11b88ad MW |
607 | return rate * lanes * 8 / 10; |
608 | } | |
609 | ||
610 | static int tb_dp_reduce_bandwidth(int max_bw, u32 in_rate, u32 in_lanes, | |
611 | u32 out_rate, u32 out_lanes, u32 *new_rate, | |
612 | u32 *new_lanes) | |
613 | { | |
614 | static const u32 dp_bw[][2] = { | |
615 | /* Mb/s, lanes */ | |
616 | { 8100, 4 }, /* 25920 Mb/s */ | |
617 | { 5400, 4 }, /* 17280 Mb/s */ | |
618 | { 8100, 2 }, /* 12960 Mb/s */ | |
619 | { 2700, 4 }, /* 8640 Mb/s */ | |
620 | { 5400, 2 }, /* 8640 Mb/s */ | |
621 | { 8100, 1 }, /* 6480 Mb/s */ | |
622 | { 1620, 4 }, /* 5184 Mb/s */ | |
623 | { 5400, 1 }, /* 4320 Mb/s */ | |
624 | { 2700, 2 }, /* 4320 Mb/s */ | |
625 | { 1620, 2 }, /* 2592 Mb/s */ | |
626 | { 2700, 1 }, /* 2160 Mb/s */ | |
627 | { 1620, 1 }, /* 1296 Mb/s */ | |
628 | }; | |
629 | unsigned int i; | |
630 | ||
631 | /* | |
632 | * Find a combination that can fit into max_bw and does not | |
633 | * exceed the maximum rate and lanes supported by the DP OUT and | |
634 | * DP IN adapters. | |
635 | */ | |
636 | for (i = 0; i < ARRAY_SIZE(dp_bw); i++) { | |
637 | if (dp_bw[i][0] > out_rate || dp_bw[i][1] > out_lanes) | |
638 | continue; | |
639 | ||
640 | if (dp_bw[i][0] > in_rate || dp_bw[i][1] > in_lanes) | |
641 | continue; | |
642 | ||
643 | if (tb_dp_bandwidth(dp_bw[i][0], dp_bw[i][1]) <= max_bw) { | |
644 | *new_rate = dp_bw[i][0]; | |
645 | *new_lanes = dp_bw[i][1]; | |
646 | return 0; | |
647 | } | |
648 | } | |
649 | ||
650 | return -ENOSR; | |
651 | } | |
652 | ||
4f807e47 MW |
653 | static int tb_dp_xchg_caps(struct tb_tunnel *tunnel) |
654 | { | |
a11b88ad | 655 | u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw; |
4f807e47 MW |
656 | struct tb_port *out = tunnel->dst_port; |
657 | struct tb_port *in = tunnel->src_port; | |
0bd680cd | 658 | int ret, max_bw; |
4f807e47 MW |
659 | |
660 | /* | |
661 | * Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for | |
662 | * newer generation hardware. | |
663 | */ | |
664 | if (in->sw->generation < 2 || out->sw->generation < 2) | |
665 | return 0; | |
666 | ||
de718ac7 MW |
667 | /* |
668 | * Perform connection manager handshake between IN and OUT ports | |
669 | * before capabilities exchange can take place. | |
670 | */ | |
b6d572ae | 671 | ret = tb_dp_cm_handshake(in, out, 3000); |
de718ac7 MW |
672 | if (ret) |
673 | return ret; | |
674 | ||
4f807e47 MW |
675 | /* Read both DP_LOCAL_CAP registers */ |
676 | ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT, | |
98176380 | 677 | in->cap_adap + DP_LOCAL_CAP, 1); |
4f807e47 MW |
678 | if (ret) |
679 | return ret; | |
680 | ||
681 | ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT, | |
98176380 | 682 | out->cap_adap + DP_LOCAL_CAP, 1); |
4f807e47 MW |
683 | if (ret) |
684 | return ret; | |
685 | ||
686 | /* Write IN local caps to OUT remote caps */ | |
687 | ret = tb_port_write(out, &in_dp_cap, TB_CFG_PORT, | |
98176380 | 688 | out->cap_adap + DP_REMOTE_CAP, 1); |
4f807e47 MW |
689 | if (ret) |
690 | return ret; | |
691 | ||
a11b88ad MW |
692 | in_rate = tb_dp_cap_get_rate(in_dp_cap); |
693 | in_lanes = tb_dp_cap_get_lanes(in_dp_cap); | |
fe8a0293 MW |
694 | tb_tunnel_dbg(tunnel, |
695 | "DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", | |
696 | in_rate, in_lanes, tb_dp_bandwidth(in_rate, in_lanes)); | |
a11b88ad MW |
697 | |
698 | /* | |
699 | * If the tunnel bandwidth is limited (max_bw is set) then see | |
700 | * if we need to reduce bandwidth to fit there. | |
701 | */ | |
702 | out_rate = tb_dp_cap_get_rate(out_dp_cap); | |
703 | out_lanes = tb_dp_cap_get_lanes(out_dp_cap); | |
704 | bw = tb_dp_bandwidth(out_rate, out_lanes); | |
fe8a0293 MW |
705 | tb_tunnel_dbg(tunnel, |
706 | "DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", | |
707 | out_rate, out_lanes, bw); | |
a11b88ad | 708 | |
769da970 | 709 | if (tb_tunnel_direction_downstream(tunnel)) |
0bd680cd MW |
710 | max_bw = tunnel->max_down; |
711 | else | |
712 | max_bw = tunnel->max_up; | |
713 | ||
714 | if (max_bw && bw > max_bw) { | |
a11b88ad MW |
715 | u32 new_rate, new_lanes, new_bw; |
716 | ||
0bd680cd | 717 | ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes, |
a11b88ad MW |
718 | out_rate, out_lanes, &new_rate, |
719 | &new_lanes); | |
720 | if (ret) { | |
fe8a0293 | 721 | tb_tunnel_info(tunnel, "not enough bandwidth\n"); |
a11b88ad MW |
722 | return ret; |
723 | } | |
724 | ||
725 | new_bw = tb_dp_bandwidth(new_rate, new_lanes); | |
fe8a0293 MW |
726 | tb_tunnel_dbg(tunnel, |
727 | "bandwidth reduced to %u Mb/s x%u = %u Mb/s\n", | |
728 | new_rate, new_lanes, new_bw); | |
a11b88ad MW |
729 | |
730 | /* | |
731 | * Set new rate and number of lanes before writing it to | |
732 | * the IN port remote caps. | |
733 | */ | |
734 | out_dp_cap = tb_dp_cap_set_rate(out_dp_cap, new_rate); | |
735 | out_dp_cap = tb_dp_cap_set_lanes(out_dp_cap, new_lanes); | |
736 | } | |
737 | ||
3eddfc12 MW |
738 | /* |
739 | * Titan Ridge does not disable AUX timers when it gets | |
740 | * SET_CONFIG with SET_LTTPR_MODE set. This causes problems with | |
741 | * DP tunneling. | |
742 | */ | |
743 | if (tb_route(out->sw) && tb_switch_is_titan_ridge(out->sw)) { | |
744 | out_dp_cap |= DP_COMMON_CAP_LTTPR_NS; | |
fe8a0293 | 745 | tb_tunnel_dbg(tunnel, "disabling LTTPR\n"); |
3eddfc12 MW |
746 | } |
747 | ||
4f807e47 | 748 | return tb_port_write(in, &out_dp_cap, TB_CFG_PORT, |
98176380 | 749 | in->cap_adap + DP_REMOTE_CAP, 1); |
4f807e47 MW |
750 | } |
751 | ||
8d73f6b8 | 752 | static int tb_dp_bandwidth_alloc_mode_enable(struct tb_tunnel *tunnel) |
6ce35635 MW |
753 | { |
754 | int ret, estimated_bw, granularity, tmp; | |
755 | struct tb_port *out = tunnel->dst_port; | |
756 | struct tb_port *in = tunnel->src_port; | |
757 | u32 out_dp_cap, out_rate, out_lanes; | |
758 | u32 in_dp_cap, in_rate, in_lanes; | |
759 | u32 rate, lanes; | |
760 | ||
761 | if (!bw_alloc_mode) | |
762 | return 0; | |
763 | ||
8d73f6b8 | 764 | ret = usb4_dp_port_set_cm_bandwidth_mode_supported(in, true); |
6ce35635 MW |
765 | if (ret) |
766 | return ret; | |
767 | ||
768 | ret = usb4_dp_port_set_group_id(in, in->group->index); | |
769 | if (ret) | |
770 | return ret; | |
771 | ||
772 | /* | |
773 | * Get the non-reduced rate and lanes based on the lowest | |
774 | * capability of both adapters. | |
775 | */ | |
776 | ret = tb_port_read(in, &in_dp_cap, TB_CFG_PORT, | |
777 | in->cap_adap + DP_LOCAL_CAP, 1); | |
778 | if (ret) | |
779 | return ret; | |
780 | ||
781 | ret = tb_port_read(out, &out_dp_cap, TB_CFG_PORT, | |
782 | out->cap_adap + DP_LOCAL_CAP, 1); | |
783 | if (ret) | |
784 | return ret; | |
785 | ||
786 | in_rate = tb_dp_cap_get_rate(in_dp_cap); | |
787 | in_lanes = tb_dp_cap_get_lanes(in_dp_cap); | |
788 | out_rate = tb_dp_cap_get_rate(out_dp_cap); | |
789 | out_lanes = tb_dp_cap_get_lanes(out_dp_cap); | |
790 | ||
791 | rate = min(in_rate, out_rate); | |
792 | lanes = min(in_lanes, out_lanes); | |
793 | tmp = tb_dp_bandwidth(rate, lanes); | |
794 | ||
fe8a0293 MW |
795 | tb_tunnel_dbg(tunnel, "non-reduced bandwidth %u Mb/s x%u = %u Mb/s\n", |
796 | rate, lanes, tmp); | |
6ce35635 MW |
797 | |
798 | ret = usb4_dp_port_set_nrd(in, rate, lanes); | |
799 | if (ret) | |
800 | return ret; | |
801 | ||
2d7e0472 MW |
802 | /* |
803 | * Pick up granularity that supports maximum possible bandwidth. | |
804 | * For that we use the UHBR rates too. | |
805 | */ | |
806 | in_rate = tb_dp_cap_get_rate_ext(in_dp_cap); | |
807 | out_rate = tb_dp_cap_get_rate_ext(out_dp_cap); | |
808 | rate = min(in_rate, out_rate); | |
809 | tmp = tb_dp_bandwidth(rate, lanes); | |
810 | ||
fe8a0293 MW |
811 | tb_tunnel_dbg(tunnel, |
812 | "maximum bandwidth through allocation mode %u Mb/s x%u = %u Mb/s\n", | |
813 | rate, lanes, tmp); | |
2d7e0472 | 814 | |
6ce35635 MW |
815 | for (granularity = 250; tmp / granularity > 255 && granularity <= 1000; |
816 | granularity *= 2) | |
817 | ; | |
818 | ||
fe8a0293 | 819 | tb_tunnel_dbg(tunnel, "granularity %d Mb/s\n", granularity); |
6ce35635 MW |
820 | |
821 | /* | |
822 | * Returns -EINVAL if granularity above is outside of the | |
823 | * accepted ranges. | |
824 | */ | |
825 | ret = usb4_dp_port_set_granularity(in, granularity); | |
826 | if (ret) | |
827 | return ret; | |
828 | ||
829 | /* | |
830 | * Bandwidth estimation is pretty much what we have in | |
831 | * max_up/down fields. For discovery we just read what the | |
832 | * estimation was set to. | |
833 | */ | |
769da970 | 834 | if (tb_tunnel_direction_downstream(tunnel)) |
6ce35635 MW |
835 | estimated_bw = tunnel->max_down; |
836 | else | |
837 | estimated_bw = tunnel->max_up; | |
838 | ||
fe8a0293 | 839 | tb_tunnel_dbg(tunnel, "estimated bandwidth %d Mb/s\n", estimated_bw); |
6ce35635 | 840 | |
8d73f6b8 | 841 | ret = usb4_dp_port_set_estimated_bandwidth(in, estimated_bw); |
6ce35635 MW |
842 | if (ret) |
843 | return ret; | |
844 | ||
845 | /* Initial allocation should be 0 according the spec */ | |
8d73f6b8 | 846 | ret = usb4_dp_port_allocate_bandwidth(in, 0); |
6ce35635 MW |
847 | if (ret) |
848 | return ret; | |
849 | ||
fe8a0293 | 850 | tb_tunnel_dbg(tunnel, "bandwidth allocation mode enabled\n"); |
6ce35635 MW |
851 | return 0; |
852 | } | |
853 | ||
854 | static int tb_dp_init(struct tb_tunnel *tunnel) | |
855 | { | |
856 | struct tb_port *in = tunnel->src_port; | |
857 | struct tb_switch *sw = in->sw; | |
858 | struct tb *tb = in->sw->tb; | |
859 | int ret; | |
860 | ||
861 | ret = tb_dp_xchg_caps(tunnel); | |
862 | if (ret) | |
863 | return ret; | |
864 | ||
865 | if (!tb_switch_is_usb4(sw)) | |
866 | return 0; | |
867 | ||
8d73f6b8 | 868 | if (!usb4_dp_port_bandwidth_mode_supported(in)) |
6ce35635 MW |
869 | return 0; |
870 | ||
fe8a0293 | 871 | tb_tunnel_dbg(tunnel, "bandwidth allocation mode supported\n"); |
6ce35635 MW |
872 | |
873 | ret = usb4_dp_port_set_cm_id(in, tb->index); | |
874 | if (ret) | |
875 | return ret; | |
876 | ||
8d73f6b8 | 877 | return tb_dp_bandwidth_alloc_mode_enable(tunnel); |
6ce35635 MW |
878 | } |
879 | ||
880 | static void tb_dp_deinit(struct tb_tunnel *tunnel) | |
881 | { | |
882 | struct tb_port *in = tunnel->src_port; | |
883 | ||
8d73f6b8 | 884 | if (!usb4_dp_port_bandwidth_mode_supported(in)) |
6ce35635 | 885 | return; |
8d73f6b8 MW |
886 | if (usb4_dp_port_bandwidth_mode_enabled(in)) { |
887 | usb4_dp_port_set_cm_bandwidth_mode_supported(in, false); | |
fe8a0293 | 888 | tb_tunnel_dbg(tunnel, "bandwidth allocation mode disabled\n"); |
6ce35635 MW |
889 | } |
890 | } | |
891 | ||
4f807e47 MW |
892 | static int tb_dp_activate(struct tb_tunnel *tunnel, bool active) |
893 | { | |
894 | int ret; | |
895 | ||
896 | if (active) { | |
897 | struct tb_path **paths; | |
898 | int last; | |
899 | ||
900 | paths = tunnel->paths; | |
901 | last = paths[TB_DP_VIDEO_PATH_OUT]->path_length - 1; | |
902 | ||
903 | tb_dp_port_set_hops(tunnel->src_port, | |
904 | paths[TB_DP_VIDEO_PATH_OUT]->hops[0].in_hop_index, | |
905 | paths[TB_DP_AUX_PATH_OUT]->hops[0].in_hop_index, | |
906 | paths[TB_DP_AUX_PATH_IN]->hops[last].next_hop_index); | |
907 | ||
908 | tb_dp_port_set_hops(tunnel->dst_port, | |
909 | paths[TB_DP_VIDEO_PATH_OUT]->hops[last].next_hop_index, | |
910 | paths[TB_DP_AUX_PATH_IN]->hops[0].in_hop_index, | |
911 | paths[TB_DP_AUX_PATH_OUT]->hops[last].next_hop_index); | |
912 | } else { | |
913 | tb_dp_port_hpd_clear(tunnel->src_port); | |
914 | tb_dp_port_set_hops(tunnel->src_port, 0, 0, 0); | |
915 | if (tb_port_is_dpout(tunnel->dst_port)) | |
916 | tb_dp_port_set_hops(tunnel->dst_port, 0, 0, 0); | |
917 | } | |
918 | ||
919 | ret = tb_dp_port_enable(tunnel->src_port, active); | |
920 | if (ret) | |
921 | return ret; | |
922 | ||
923 | if (tb_port_is_dpout(tunnel->dst_port)) | |
924 | return tb_dp_port_enable(tunnel->dst_port, active); | |
925 | ||
926 | return 0; | |
927 | } | |
928 | ||
7b5e0bfc MW |
929 | /** |
930 | * tb_dp_bandwidth_mode_maximum_bandwidth() - Maximum possible bandwidth | |
931 | * @tunnel: DP tunnel to check | |
932 | * @max_bw_rounded: Maximum bandwidth in Mb/s rounded up to the next granularity | |
933 | * | |
934 | * Returns maximum possible bandwidth for this tunnel in Mb/s. | |
935 | */ | |
2d7e0472 | 936 | static int tb_dp_bandwidth_mode_maximum_bandwidth(struct tb_tunnel *tunnel, |
7b5e0bfc | 937 | int *max_bw_rounded) |
6ce35635 MW |
938 | { |
939 | struct tb_port *in = tunnel->src_port; | |
7b5e0bfc | 940 | int ret, rate, lanes, max_bw; |
2d7e0472 | 941 | u32 cap; |
6ce35635 | 942 | |
2d7e0472 MW |
943 | /* |
944 | * DP IN adapter DP_LOCAL_CAP gets updated to the lowest AUX | |
945 | * read parameter values so this so we can use this to determine | |
946 | * the maximum possible bandwidth over this link. | |
947 | * | |
948 | * See USB4 v2 spec 1.0 10.4.4.5. | |
949 | */ | |
950 | ret = tb_port_read(in, &cap, TB_CFG_PORT, | |
951 | in->cap_adap + DP_LOCAL_CAP, 1); | |
6ce35635 MW |
952 | if (ret) |
953 | return ret; | |
954 | ||
2d7e0472 | 955 | rate = tb_dp_cap_get_rate_ext(cap); |
7b5e0bfc | 956 | lanes = tb_dp_cap_get_lanes(cap); |
2d7e0472 | 957 | |
7b5e0bfc | 958 | max_bw = tb_dp_bandwidth(rate, lanes); |
6ce35635 | 959 | |
7b5e0bfc | 960 | if (max_bw_rounded) { |
6ce35635 MW |
961 | ret = usb4_dp_port_granularity(in); |
962 | if (ret < 0) | |
963 | return ret; | |
7b5e0bfc | 964 | *max_bw_rounded = roundup(max_bw, ret); |
6ce35635 MW |
965 | } |
966 | ||
7b5e0bfc | 967 | return max_bw; |
6ce35635 MW |
968 | } |
969 | ||
8d73f6b8 MW |
970 | static int tb_dp_bandwidth_mode_consumed_bandwidth(struct tb_tunnel *tunnel, |
971 | int *consumed_up, | |
972 | int *consumed_down) | |
6ce35635 | 973 | { |
6ce35635 | 974 | struct tb_port *in = tunnel->src_port; |
7b5e0bfc | 975 | int ret, allocated_bw, max_bw_rounded; |
6ce35635 | 976 | |
8d73f6b8 | 977 | if (!usb4_dp_port_bandwidth_mode_enabled(in)) |
6ce35635 MW |
978 | return -EOPNOTSUPP; |
979 | ||
980 | if (!tunnel->bw_mode) | |
981 | return -EOPNOTSUPP; | |
982 | ||
983 | /* Read what was allocated previously if any */ | |
8d73f6b8 | 984 | ret = usb4_dp_port_allocated_bandwidth(in); |
6ce35635 MW |
985 | if (ret < 0) |
986 | return ret; | |
987 | allocated_bw = ret; | |
988 | ||
7b5e0bfc | 989 | ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded); |
6ce35635 MW |
990 | if (ret < 0) |
991 | return ret; | |
7b5e0bfc | 992 | if (allocated_bw == max_bw_rounded) |
6ce35635 MW |
993 | allocated_bw = ret; |
994 | ||
769da970 | 995 | if (tb_tunnel_direction_downstream(tunnel)) { |
6ce35635 MW |
996 | *consumed_up = 0; |
997 | *consumed_down = allocated_bw; | |
998 | } else { | |
999 | *consumed_up = allocated_bw; | |
1000 | *consumed_down = 0; | |
1001 | } | |
1002 | ||
1003 | return 0; | |
1004 | } | |
1005 | ||
1006 | static int tb_dp_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up, | |
1007 | int *allocated_down) | |
1008 | { | |
6ce35635 MW |
1009 | struct tb_port *in = tunnel->src_port; |
1010 | ||
1011 | /* | |
1012 | * If we have already set the allocated bandwidth then use that. | |
1013 | * Otherwise we read it from the DPRX. | |
1014 | */ | |
8d73f6b8 | 1015 | if (usb4_dp_port_bandwidth_mode_enabled(in) && tunnel->bw_mode) { |
7b5e0bfc | 1016 | int ret, allocated_bw, max_bw_rounded; |
6ce35635 | 1017 | |
8d73f6b8 | 1018 | ret = usb4_dp_port_allocated_bandwidth(in); |
6ce35635 MW |
1019 | if (ret < 0) |
1020 | return ret; | |
1021 | allocated_bw = ret; | |
1022 | ||
7b5e0bfc MW |
1023 | ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, |
1024 | &max_bw_rounded); | |
6ce35635 MW |
1025 | if (ret < 0) |
1026 | return ret; | |
7b5e0bfc | 1027 | if (allocated_bw == max_bw_rounded) |
6ce35635 MW |
1028 | allocated_bw = ret; |
1029 | ||
769da970 | 1030 | if (tb_tunnel_direction_downstream(tunnel)) { |
6ce35635 MW |
1031 | *allocated_up = 0; |
1032 | *allocated_down = allocated_bw; | |
1033 | } else { | |
1034 | *allocated_up = allocated_bw; | |
1035 | *allocated_down = 0; | |
1036 | } | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | return tunnel->consumed_bandwidth(tunnel, allocated_up, | |
1041 | allocated_down); | |
1042 | } | |
1043 | ||
1044 | static int tb_dp_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up, | |
1045 | int *alloc_down) | |
1046 | { | |
6ce35635 | 1047 | struct tb_port *in = tunnel->src_port; |
7b5e0bfc | 1048 | int max_bw_rounded, ret, tmp; |
6ce35635 | 1049 | |
8d73f6b8 | 1050 | if (!usb4_dp_port_bandwidth_mode_enabled(in)) |
6ce35635 MW |
1051 | return -EOPNOTSUPP; |
1052 | ||
7b5e0bfc | 1053 | ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, &max_bw_rounded); |
6ce35635 MW |
1054 | if (ret < 0) |
1055 | return ret; | |
1056 | ||
769da970 | 1057 | if (tb_tunnel_direction_downstream(tunnel)) { |
7b5e0bfc | 1058 | tmp = min(*alloc_down, max_bw_rounded); |
8d73f6b8 | 1059 | ret = usb4_dp_port_allocate_bandwidth(in, tmp); |
6ce35635 MW |
1060 | if (ret) |
1061 | return ret; | |
1062 | *alloc_down = tmp; | |
1063 | *alloc_up = 0; | |
1064 | } else { | |
7b5e0bfc | 1065 | tmp = min(*alloc_up, max_bw_rounded); |
8d73f6b8 | 1066 | ret = usb4_dp_port_allocate_bandwidth(in, tmp); |
6ce35635 MW |
1067 | if (ret) |
1068 | return ret; | |
1069 | *alloc_down = 0; | |
1070 | *alloc_up = tmp; | |
1071 | } | |
1072 | ||
1073 | /* Now we can use BW mode registers to figure out the bandwidth */ | |
1074 | /* TODO: need to handle discovery too */ | |
1075 | tunnel->bw_mode = true; | |
1076 | return 0; | |
1077 | } | |
1078 | ||
97e0a21c | 1079 | static int tb_dp_wait_dprx(struct tb_tunnel *tunnel, int timeout_msec) |
6ce35635 MW |
1080 | { |
1081 | ktime_t timeout = ktime_add_ms(ktime_get(), timeout_msec); | |
1082 | struct tb_port *in = tunnel->src_port; | |
1083 | ||
1084 | /* | |
1085 | * Wait for DPRX done. Normally it should be already set for | |
1086 | * active tunnel. | |
1087 | */ | |
1088 | do { | |
1089 | u32 val; | |
1090 | int ret; | |
1091 | ||
1092 | ret = tb_port_read(in, &val, TB_CFG_PORT, | |
1093 | in->cap_adap + DP_COMMON_CAP, 1); | |
1094 | if (ret) | |
1095 | return ret; | |
1096 | ||
1097 | if (val & DP_COMMON_CAP_DPRX_DONE) { | |
fe8a0293 | 1098 | tb_tunnel_dbg(tunnel, "DPRX read done\n"); |
6ce35635 MW |
1099 | return 0; |
1100 | } | |
1101 | usleep_range(100, 150); | |
1102 | } while (ktime_before(ktime_get(), timeout)); | |
1103 | ||
97e0a21c | 1104 | tb_tunnel_dbg(tunnel, "DPRX read timeout\n"); |
6ce35635 MW |
1105 | return -ETIMEDOUT; |
1106 | } | |
1107 | ||
1108 | /* Read cap from tunnel DP IN */ | |
1109 | static int tb_dp_read_cap(struct tb_tunnel *tunnel, unsigned int cap, u32 *rate, | |
1110 | u32 *lanes) | |
1111 | { | |
1112 | struct tb_port *in = tunnel->src_port; | |
1113 | u32 val; | |
1114 | int ret; | |
1115 | ||
1116 | switch (cap) { | |
1117 | case DP_LOCAL_CAP: | |
1118 | case DP_REMOTE_CAP: | |
97e0a21c | 1119 | case DP_COMMON_CAP: |
6ce35635 MW |
1120 | break; |
1121 | ||
1122 | default: | |
1123 | tb_tunnel_WARN(tunnel, "invalid capability index %#x\n", cap); | |
1124 | return -EINVAL; | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * Read from the copied remote cap so that we take into account | |
1129 | * if capabilities were reduced during exchange. | |
1130 | */ | |
1131 | ret = tb_port_read(in, &val, TB_CFG_PORT, in->cap_adap + cap, 1); | |
1132 | if (ret) | |
1133 | return ret; | |
1134 | ||
1135 | *rate = tb_dp_cap_get_rate(val); | |
1136 | *lanes = tb_dp_cap_get_lanes(val); | |
6ce35635 MW |
1137 | return 0; |
1138 | } | |
1139 | ||
1140 | static int tb_dp_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up, | |
1141 | int *max_down) | |
1142 | { | |
6ce35635 MW |
1143 | int ret; |
1144 | ||
769da970 | 1145 | if (!usb4_dp_port_bandwidth_mode_enabled(tunnel->src_port)) |
2d7e0472 MW |
1146 | return -EOPNOTSUPP; |
1147 | ||
1148 | ret = tb_dp_bandwidth_mode_maximum_bandwidth(tunnel, NULL); | |
1149 | if (ret < 0) | |
6ce35635 MW |
1150 | return ret; |
1151 | ||
769da970 | 1152 | if (tb_tunnel_direction_downstream(tunnel)) { |
6ce35635 | 1153 | *max_up = 0; |
2d7e0472 | 1154 | *max_down = ret; |
6ce35635 | 1155 | } else { |
2d7e0472 | 1156 | *max_up = ret; |
6ce35635 MW |
1157 | *max_down = 0; |
1158 | } | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
7c0ee8fd MW |
1163 | static int tb_dp_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, |
1164 | int *consumed_down) | |
a11b88ad | 1165 | { |
769da970 | 1166 | const struct tb_switch *sw = tunnel->src_port->sw; |
6ce35635 | 1167 | u32 rate = 0, lanes = 0; |
a11b88ad MW |
1168 | int ret; |
1169 | ||
b0407983 | 1170 | if (tb_dp_is_usb4(sw)) { |
a11b88ad | 1171 | /* |
6ce35635 MW |
1172 | * On USB4 routers check if the bandwidth allocation |
1173 | * mode is enabled first and then read the bandwidth | |
1174 | * through those registers. | |
a11b88ad | 1175 | */ |
8d73f6b8 MW |
1176 | ret = tb_dp_bandwidth_mode_consumed_bandwidth(tunnel, consumed_up, |
1177 | consumed_down); | |
6ce35635 MW |
1178 | if (ret < 0) { |
1179 | if (ret != -EOPNOTSUPP) | |
a11b88ad | 1180 | return ret; |
6ce35635 MW |
1181 | } else if (!ret) { |
1182 | return 0; | |
1183 | } | |
a11b88ad | 1184 | /* |
6ce35635 MW |
1185 | * Then see if the DPRX negotiation is ready and if yes |
1186 | * return that bandwidth (it may be smaller than the | |
ccd84502 GF |
1187 | * reduced one). According to VESA spec, the DPRX |
1188 | * negotiation shall compete in 5 seconds after tunnel | |
1189 | * established. We give it 100ms extra just in case. | |
a11b88ad | 1190 | */ |
ccd84502 GF |
1191 | ret = tb_dp_wait_dprx(tunnel, 5100); |
1192 | if (ret) | |
1193 | return ret; | |
97e0a21c MW |
1194 | ret = tb_dp_read_cap(tunnel, DP_COMMON_CAP, &rate, &lanes); |
1195 | if (ret) | |
1196 | return ret; | |
6ce35635 MW |
1197 | } else if (sw->generation >= 2) { |
1198 | ret = tb_dp_read_cap(tunnel, DP_REMOTE_CAP, &rate, &lanes); | |
a11b88ad MW |
1199 | if (ret) |
1200 | return ret; | |
a11b88ad MW |
1201 | } else { |
1202 | /* No bandwidth management for legacy devices */ | |
7c0ee8fd MW |
1203 | *consumed_up = 0; |
1204 | *consumed_down = 0; | |
a11b88ad MW |
1205 | return 0; |
1206 | } | |
1207 | ||
769da970 | 1208 | if (tb_tunnel_direction_downstream(tunnel)) { |
7c0ee8fd MW |
1209 | *consumed_up = 0; |
1210 | *consumed_down = tb_dp_bandwidth(rate, lanes); | |
1211 | } else { | |
1212 | *consumed_up = tb_dp_bandwidth(rate, lanes); | |
1213 | *consumed_down = 0; | |
1214 | } | |
1215 | ||
1216 | return 0; | |
a11b88ad MW |
1217 | } |
1218 | ||
6ed541c5 MW |
1219 | static void tb_dp_init_aux_credits(struct tb_path_hop *hop) |
1220 | { | |
1221 | struct tb_port *port = hop->in_port; | |
1222 | struct tb_switch *sw = port->sw; | |
1223 | ||
1224 | if (tb_port_use_credit_allocation(port)) | |
1225 | hop->initial_credits = sw->min_dp_aux_credits; | |
1226 | else | |
1227 | hop->initial_credits = 1; | |
1228 | } | |
1229 | ||
ce91d793 | 1230 | static void tb_dp_init_aux_path(struct tb_path *path, bool pm_support) |
4f807e47 | 1231 | { |
6ed541c5 | 1232 | struct tb_path_hop *hop; |
4f807e47 MW |
1233 | |
1234 | path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; | |
1235 | path->egress_shared_buffer = TB_PATH_NONE; | |
1236 | path->ingress_fc_enable = TB_PATH_ALL; | |
1237 | path->ingress_shared_buffer = TB_PATH_NONE; | |
f73edddf MW |
1238 | path->priority = TB_DP_AUX_PRIORITY; |
1239 | path->weight = TB_DP_AUX_WEIGHT; | |
4f807e47 | 1240 | |
ce91d793 | 1241 | tb_path_for_each_hop(path, hop) { |
6ed541c5 | 1242 | tb_dp_init_aux_credits(hop); |
ce91d793 MW |
1243 | if (pm_support) |
1244 | tb_init_pm_support(hop); | |
1245 | } | |
4f807e47 MW |
1246 | } |
1247 | ||
6ed541c5 | 1248 | static int tb_dp_init_video_credits(struct tb_path_hop *hop) |
4f807e47 | 1249 | { |
6ed541c5 MW |
1250 | struct tb_port *port = hop->in_port; |
1251 | struct tb_switch *sw = port->sw; | |
1252 | ||
1253 | if (tb_port_use_credit_allocation(port)) { | |
1254 | unsigned int nfc_credits; | |
1255 | size_t max_dp_streams; | |
1256 | ||
1257 | tb_available_credits(port, &max_dp_streams); | |
1258 | /* | |
1259 | * Read the number of currently allocated NFC credits | |
1260 | * from the lane adapter. Since we only use them for DP | |
1261 | * tunneling we can use that to figure out how many DP | |
1262 | * tunnels already go through the lane adapter. | |
1263 | */ | |
1264 | nfc_credits = port->config.nfc_credits & | |
1265 | ADP_CS_4_NFC_BUFFERS_MASK; | |
1266 | if (nfc_credits / sw->min_dp_main_credits > max_dp_streams) | |
1267 | return -ENOSPC; | |
1268 | ||
1269 | hop->nfc_credits = sw->min_dp_main_credits; | |
1270 | } else { | |
1271 | hop->nfc_credits = min(port->total_credits - 2, 12U); | |
1272 | } | |
1273 | ||
1274 | return 0; | |
1275 | } | |
1276 | ||
ce91d793 | 1277 | static int tb_dp_init_video_path(struct tb_path *path, bool pm_support) |
6ed541c5 MW |
1278 | { |
1279 | struct tb_path_hop *hop; | |
4f807e47 MW |
1280 | |
1281 | path->egress_fc_enable = TB_PATH_NONE; | |
1282 | path->egress_shared_buffer = TB_PATH_NONE; | |
1283 | path->ingress_fc_enable = TB_PATH_NONE; | |
1284 | path->ingress_shared_buffer = TB_PATH_NONE; | |
f73edddf MW |
1285 | path->priority = TB_DP_VIDEO_PRIORITY; |
1286 | path->weight = TB_DP_VIDEO_WEIGHT; | |
4f807e47 | 1287 | |
6ed541c5 MW |
1288 | tb_path_for_each_hop(path, hop) { |
1289 | int ret; | |
02c5e7c2 | 1290 | |
6ed541c5 MW |
1291 | ret = tb_dp_init_video_credits(hop); |
1292 | if (ret) | |
1293 | return ret; | |
ce91d793 MW |
1294 | if (pm_support) |
1295 | tb_init_pm_support(hop); | |
4f807e47 | 1296 | } |
6ed541c5 MW |
1297 | |
1298 | return 0; | |
4f807e47 MW |
1299 | } |
1300 | ||
033c2d8a MW |
1301 | static void tb_dp_dump(struct tb_tunnel *tunnel) |
1302 | { | |
1303 | struct tb_port *in, *out; | |
1304 | u32 dp_cap, rate, lanes; | |
1305 | ||
1306 | in = tunnel->src_port; | |
1307 | out = tunnel->dst_port; | |
1308 | ||
1309 | if (tb_port_read(in, &dp_cap, TB_CFG_PORT, | |
1310 | in->cap_adap + DP_LOCAL_CAP, 1)) | |
1311 | return; | |
1312 | ||
1313 | rate = tb_dp_cap_get_rate(dp_cap); | |
1314 | lanes = tb_dp_cap_get_lanes(dp_cap); | |
1315 | ||
fe8a0293 MW |
1316 | tb_tunnel_dbg(tunnel, |
1317 | "DP IN maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", | |
1318 | rate, lanes, tb_dp_bandwidth(rate, lanes)); | |
033c2d8a | 1319 | |
033c2d8a MW |
1320 | if (tb_port_read(out, &dp_cap, TB_CFG_PORT, |
1321 | out->cap_adap + DP_LOCAL_CAP, 1)) | |
1322 | return; | |
1323 | ||
1324 | rate = tb_dp_cap_get_rate(dp_cap); | |
1325 | lanes = tb_dp_cap_get_lanes(dp_cap); | |
1326 | ||
fe8a0293 MW |
1327 | tb_tunnel_dbg(tunnel, |
1328 | "DP OUT maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n", | |
1329 | rate, lanes, tb_dp_bandwidth(rate, lanes)); | |
033c2d8a MW |
1330 | |
1331 | if (tb_port_read(in, &dp_cap, TB_CFG_PORT, | |
1332 | in->cap_adap + DP_REMOTE_CAP, 1)) | |
1333 | return; | |
1334 | ||
1335 | rate = tb_dp_cap_get_rate(dp_cap); | |
1336 | lanes = tb_dp_cap_get_lanes(dp_cap); | |
1337 | ||
fe8a0293 MW |
1338 | tb_tunnel_dbg(tunnel, "reduced bandwidth %u Mb/s x%u = %u Mb/s\n", |
1339 | rate, lanes, tb_dp_bandwidth(rate, lanes)); | |
033c2d8a MW |
1340 | } |
1341 | ||
4f807e47 MW |
1342 | /** |
1343 | * tb_tunnel_discover_dp() - Discover existing Display Port tunnels | |
1344 | * @tb: Pointer to the domain structure | |
1345 | * @in: DP in adapter | |
43bddb26 | 1346 | * @alloc_hopid: Allocate HopIDs from visited ports |
4f807e47 MW |
1347 | * |
1348 | * If @in adapter is active, follows the tunnel to the DP out adapter | |
1349 | * and back. Returns the discovered tunnel or %NULL if there was no | |
1350 | * tunnel. | |
1351 | * | |
1352 | * Return: DP tunnel or %NULL if no tunnel found. | |
1353 | */ | |
43bddb26 MW |
1354 | struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in, |
1355 | bool alloc_hopid) | |
4f807e47 MW |
1356 | { |
1357 | struct tb_tunnel *tunnel; | |
1358 | struct tb_port *port; | |
1359 | struct tb_path *path; | |
1360 | ||
1361 | if (!tb_dp_port_is_enabled(in)) | |
1362 | return NULL; | |
1363 | ||
1364 | tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP); | |
1365 | if (!tunnel) | |
1366 | return NULL; | |
1367 | ||
6ce35635 MW |
1368 | tunnel->init = tb_dp_init; |
1369 | tunnel->deinit = tb_dp_deinit; | |
4f807e47 | 1370 | tunnel->activate = tb_dp_activate; |
6ce35635 MW |
1371 | tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth; |
1372 | tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth; | |
1373 | tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth; | |
a11b88ad | 1374 | tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth; |
4f807e47 MW |
1375 | tunnel->src_port = in; |
1376 | ||
1377 | path = tb_path_discover(in, TB_DP_VIDEO_HOPID, NULL, -1, | |
43bddb26 | 1378 | &tunnel->dst_port, "Video", alloc_hopid); |
4f807e47 MW |
1379 | if (!path) { |
1380 | /* Just disable the DP IN port */ | |
1381 | tb_dp_port_enable(in, false); | |
1382 | goto err_free; | |
1383 | } | |
1384 | tunnel->paths[TB_DP_VIDEO_PATH_OUT] = path; | |
ce91d793 | 1385 | if (tb_dp_init_video_path(tunnel->paths[TB_DP_VIDEO_PATH_OUT], false)) |
6ed541c5 | 1386 | goto err_free; |
4f807e47 | 1387 | |
43bddb26 MW |
1388 | path = tb_path_discover(in, TB_DP_AUX_TX_HOPID, NULL, -1, NULL, "AUX TX", |
1389 | alloc_hopid); | |
4f807e47 MW |
1390 | if (!path) |
1391 | goto err_deactivate; | |
1392 | tunnel->paths[TB_DP_AUX_PATH_OUT] = path; | |
ce91d793 | 1393 | tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_OUT], false); |
4f807e47 MW |
1394 | |
1395 | path = tb_path_discover(tunnel->dst_port, -1, in, TB_DP_AUX_RX_HOPID, | |
43bddb26 | 1396 | &port, "AUX RX", alloc_hopid); |
4f807e47 MW |
1397 | if (!path) |
1398 | goto err_deactivate; | |
1399 | tunnel->paths[TB_DP_AUX_PATH_IN] = path; | |
ce91d793 | 1400 | tb_dp_init_aux_path(tunnel->paths[TB_DP_AUX_PATH_IN], false); |
4f807e47 MW |
1401 | |
1402 | /* Validate that the tunnel is complete */ | |
1403 | if (!tb_port_is_dpout(tunnel->dst_port)) { | |
1404 | tb_port_warn(in, "path does not end on a DP adapter, cleaning up\n"); | |
1405 | goto err_deactivate; | |
1406 | } | |
1407 | ||
1408 | if (!tb_dp_port_is_enabled(tunnel->dst_port)) | |
1409 | goto err_deactivate; | |
1410 | ||
1411 | if (!tb_dp_port_hpd_is_active(tunnel->dst_port)) | |
1412 | goto err_deactivate; | |
1413 | ||
1414 | if (port != tunnel->src_port) { | |
1415 | tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); | |
1416 | goto err_deactivate; | |
1417 | } | |
1418 | ||
033c2d8a MW |
1419 | tb_dp_dump(tunnel); |
1420 | ||
4f807e47 MW |
1421 | tb_tunnel_dbg(tunnel, "discovered\n"); |
1422 | return tunnel; | |
1423 | ||
1424 | err_deactivate: | |
1425 | tb_tunnel_deactivate(tunnel); | |
1426 | err_free: | |
1427 | tb_tunnel_free(tunnel); | |
1428 | ||
1429 | return NULL; | |
1430 | } | |
1431 | ||
1432 | /** | |
1433 | * tb_tunnel_alloc_dp() - allocate a Display Port tunnel | |
1434 | * @tb: Pointer to the domain structure | |
1435 | * @in: DP in adapter port | |
1436 | * @out: DP out adapter port | |
9d2d0a5c | 1437 | * @link_nr: Preferred lane adapter when the link is not bonded |
0bd680cd MW |
1438 | * @max_up: Maximum available upstream bandwidth for the DP tunnel (%0 |
1439 | * if not limited) | |
1440 | * @max_down: Maximum available downstream bandwidth for the DP tunnel | |
1441 | * (%0 if not limited) | |
4f807e47 MW |
1442 | * |
1443 | * Allocates a tunnel between @in and @out that is capable of tunneling | |
1444 | * Display Port traffic. | |
1445 | * | |
1446 | * Return: Returns a tb_tunnel on success or NULL on failure. | |
1447 | */ | |
1448 | struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in, | |
9d2d0a5c MW |
1449 | struct tb_port *out, int link_nr, |
1450 | int max_up, int max_down) | |
4f807e47 MW |
1451 | { |
1452 | struct tb_tunnel *tunnel; | |
1453 | struct tb_path **paths; | |
1454 | struct tb_path *path; | |
ce91d793 | 1455 | bool pm_support; |
4f807e47 MW |
1456 | |
1457 | if (WARN_ON(!in->cap_adap || !out->cap_adap)) | |
1458 | return NULL; | |
1459 | ||
1460 | tunnel = tb_tunnel_alloc(tb, 3, TB_TUNNEL_DP); | |
1461 | if (!tunnel) | |
1462 | return NULL; | |
1463 | ||
6ce35635 MW |
1464 | tunnel->init = tb_dp_init; |
1465 | tunnel->deinit = tb_dp_deinit; | |
4f807e47 | 1466 | tunnel->activate = tb_dp_activate; |
6ce35635 MW |
1467 | tunnel->maximum_bandwidth = tb_dp_maximum_bandwidth; |
1468 | tunnel->allocated_bandwidth = tb_dp_allocated_bandwidth; | |
1469 | tunnel->alloc_bandwidth = tb_dp_alloc_bandwidth; | |
a11b88ad | 1470 | tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth; |
4f807e47 MW |
1471 | tunnel->src_port = in; |
1472 | tunnel->dst_port = out; | |
0bd680cd MW |
1473 | tunnel->max_up = max_up; |
1474 | tunnel->max_down = max_down; | |
4f807e47 MW |
1475 | |
1476 | paths = tunnel->paths; | |
ce91d793 | 1477 | pm_support = usb4_switch_version(in->sw) >= 2; |
4f807e47 MW |
1478 | |
1479 | path = tb_path_alloc(tb, in, TB_DP_VIDEO_HOPID, out, TB_DP_VIDEO_HOPID, | |
9d2d0a5c | 1480 | link_nr, "Video"); |
4f807e47 MW |
1481 | if (!path) |
1482 | goto err_free; | |
ce91d793 | 1483 | tb_dp_init_video_path(path, pm_support); |
4f807e47 MW |
1484 | paths[TB_DP_VIDEO_PATH_OUT] = path; |
1485 | ||
1486 | path = tb_path_alloc(tb, in, TB_DP_AUX_TX_HOPID, out, | |
9d2d0a5c | 1487 | TB_DP_AUX_TX_HOPID, link_nr, "AUX TX"); |
4f807e47 MW |
1488 | if (!path) |
1489 | goto err_free; | |
ce91d793 | 1490 | tb_dp_init_aux_path(path, pm_support); |
4f807e47 MW |
1491 | paths[TB_DP_AUX_PATH_OUT] = path; |
1492 | ||
1493 | path = tb_path_alloc(tb, out, TB_DP_AUX_RX_HOPID, in, | |
9d2d0a5c | 1494 | TB_DP_AUX_RX_HOPID, link_nr, "AUX RX"); |
4f807e47 MW |
1495 | if (!path) |
1496 | goto err_free; | |
ce91d793 | 1497 | tb_dp_init_aux_path(path, pm_support); |
4f807e47 MW |
1498 | paths[TB_DP_AUX_PATH_IN] = path; |
1499 | ||
1500 | return tunnel; | |
1501 | ||
1502 | err_free: | |
1503 | tb_tunnel_free(tunnel); | |
1504 | return NULL; | |
1505 | } | |
1506 | ||
6ed541c5 | 1507 | static unsigned int tb_dma_available_credits(const struct tb_port *port) |
44242d6c | 1508 | { |
6ed541c5 MW |
1509 | const struct tb_switch *sw = port->sw; |
1510 | int credits; | |
44242d6c | 1511 | |
6ed541c5 MW |
1512 | credits = tb_available_credits(port, NULL); |
1513 | if (tb_acpi_may_tunnel_pcie()) | |
1514 | credits -= sw->max_pcie_credits; | |
1515 | credits -= port->dma_credits; | |
1516 | ||
1517 | return credits > 0 ? credits : 0; | |
44242d6c MW |
1518 | } |
1519 | ||
6ed541c5 | 1520 | static int tb_dma_reserve_credits(struct tb_path_hop *hop, unsigned int credits) |
44242d6c | 1521 | { |
6ed541c5 MW |
1522 | struct tb_port *port = hop->in_port; |
1523 | ||
1524 | if (tb_port_use_credit_allocation(port)) { | |
1525 | unsigned int available = tb_dma_available_credits(port); | |
1526 | ||
1527 | /* | |
1528 | * Need to have at least TB_MIN_DMA_CREDITS, otherwise | |
1529 | * DMA path cannot be established. | |
1530 | */ | |
1531 | if (available < TB_MIN_DMA_CREDITS) | |
1532 | return -ENOSPC; | |
1533 | ||
1534 | while (credits > available) | |
1535 | credits--; | |
1536 | ||
1537 | tb_port_dbg(port, "reserving %u credits for DMA path\n", | |
1538 | credits); | |
1539 | ||
1540 | port->dma_credits += credits; | |
1541 | } else { | |
1542 | if (tb_port_is_null(port)) | |
1543 | credits = port->bonded ? 14 : 6; | |
1544 | else | |
1545 | credits = min(port->total_credits, credits); | |
1546 | } | |
44242d6c | 1547 | |
6ed541c5 MW |
1548 | hop->initial_credits = credits; |
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | /* Path from lane adapter to NHI */ | |
1553 | static int tb_dma_init_rx_path(struct tb_path *path, unsigned int credits) | |
1554 | { | |
1555 | struct tb_path_hop *hop; | |
1556 | unsigned int i, tmp; | |
1557 | ||
1558 | path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; | |
44242d6c MW |
1559 | path->ingress_fc_enable = TB_PATH_ALL; |
1560 | path->egress_shared_buffer = TB_PATH_NONE; | |
e5876559 | 1561 | path->ingress_shared_buffer = TB_PATH_NONE; |
f73edddf MW |
1562 | path->priority = TB_DMA_PRIORITY; |
1563 | path->weight = TB_DMA_WEIGHT; | |
44242d6c MW |
1564 | path->clear_fc = true; |
1565 | ||
6ed541c5 MW |
1566 | /* |
1567 | * First lane adapter is the one connected to the remote host. | |
1568 | * We don't tunnel other traffic over this link so can use all | |
1569 | * the credits (except the ones reserved for control traffic). | |
1570 | */ | |
1571 | hop = &path->hops[0]; | |
1572 | tmp = min(tb_usable_credits(hop->in_port), credits); | |
1573 | hop->initial_credits = tmp; | |
1574 | hop->in_port->dma_credits += tmp; | |
1575 | ||
1576 | for (i = 1; i < path->path_length; i++) { | |
1577 | int ret; | |
1578 | ||
1579 | ret = tb_dma_reserve_credits(&path->hops[i], credits); | |
1580 | if (ret) | |
1581 | return ret; | |
1582 | } | |
1583 | ||
1584 | return 0; | |
1585 | } | |
1586 | ||
1587 | /* Path from NHI to lane adapter */ | |
1588 | static int tb_dma_init_tx_path(struct tb_path *path, unsigned int credits) | |
1589 | { | |
1590 | struct tb_path_hop *hop; | |
1591 | ||
1592 | path->egress_fc_enable = TB_PATH_ALL; | |
1593 | path->ingress_fc_enable = TB_PATH_ALL; | |
1594 | path->egress_shared_buffer = TB_PATH_NONE; | |
1595 | path->ingress_shared_buffer = TB_PATH_NONE; | |
f73edddf MW |
1596 | path->priority = TB_DMA_PRIORITY; |
1597 | path->weight = TB_DMA_WEIGHT; | |
6ed541c5 MW |
1598 | path->clear_fc = true; |
1599 | ||
1600 | tb_path_for_each_hop(path, hop) { | |
1601 | int ret; | |
1602 | ||
1603 | ret = tb_dma_reserve_credits(hop, credits); | |
1604 | if (ret) | |
1605 | return ret; | |
1606 | } | |
1607 | ||
1608 | return 0; | |
1609 | } | |
1610 | ||
1611 | static void tb_dma_release_credits(struct tb_path_hop *hop) | |
1612 | { | |
1613 | struct tb_port *port = hop->in_port; | |
1614 | ||
1615 | if (tb_port_use_credit_allocation(port)) { | |
1616 | port->dma_credits -= hop->initial_credits; | |
1617 | ||
1618 | tb_port_dbg(port, "released %u DMA path credits\n", | |
1619 | hop->initial_credits); | |
1620 | } | |
1621 | } | |
1622 | ||
1623 | static void tb_dma_deinit_path(struct tb_path *path) | |
1624 | { | |
1625 | struct tb_path_hop *hop; | |
1626 | ||
1627 | tb_path_for_each_hop(path, hop) | |
1628 | tb_dma_release_credits(hop); | |
1629 | } | |
1630 | ||
1631 | static void tb_dma_deinit(struct tb_tunnel *tunnel) | |
1632 | { | |
1633 | int i; | |
1634 | ||
1635 | for (i = 0; i < tunnel->npaths; i++) { | |
1636 | if (!tunnel->paths[i]) | |
1637 | continue; | |
1638 | tb_dma_deinit_path(tunnel->paths[i]); | |
1639 | } | |
44242d6c MW |
1640 | } |
1641 | ||
1642 | /** | |
1643 | * tb_tunnel_alloc_dma() - allocate a DMA tunnel | |
1644 | * @tb: Pointer to the domain structure | |
1645 | * @nhi: Host controller port | |
1646 | * @dst: Destination null port which the other domain is connected to | |
44242d6c | 1647 | * @transmit_path: HopID used for transmitting packets |
180b0689 MW |
1648 | * @transmit_ring: NHI ring number used to send packets towards the |
1649 | * other domain. Set to %-1 if TX path is not needed. | |
a27ea0df | 1650 | * @receive_path: HopID used for receiving packets |
180b0689 MW |
1651 | * @receive_ring: NHI ring number used to receive packets from the |
1652 | * other domain. Set to %-1 if RX path is not needed. | |
44242d6c MW |
1653 | * |
1654 | * Return: Returns a tb_tunnel on success or NULL on failure. | |
1655 | */ | |
1656 | struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi, | |
180b0689 MW |
1657 | struct tb_port *dst, int transmit_path, |
1658 | int transmit_ring, int receive_path, | |
1659 | int receive_ring) | |
44242d6c MW |
1660 | { |
1661 | struct tb_tunnel *tunnel; | |
5bf722df | 1662 | size_t npaths = 0, i = 0; |
44242d6c | 1663 | struct tb_path *path; |
6ed541c5 | 1664 | int credits; |
44242d6c | 1665 | |
814c96c9 MW |
1666 | /* Ring 0 is reserved for control channel */ |
1667 | if (WARN_ON(!receive_ring || !transmit_ring)) | |
1668 | return NULL; | |
1669 | ||
180b0689 | 1670 | if (receive_ring > 0) |
5bf722df | 1671 | npaths++; |
180b0689 | 1672 | if (transmit_ring > 0) |
5bf722df MW |
1673 | npaths++; |
1674 | ||
1675 | if (WARN_ON(!npaths)) | |
1676 | return NULL; | |
1677 | ||
1678 | tunnel = tb_tunnel_alloc(tb, npaths, TB_TUNNEL_DMA); | |
44242d6c MW |
1679 | if (!tunnel) |
1680 | return NULL; | |
1681 | ||
44242d6c MW |
1682 | tunnel->src_port = nhi; |
1683 | tunnel->dst_port = dst; | |
6ed541c5 | 1684 | tunnel->deinit = tb_dma_deinit; |
44242d6c | 1685 | |
7ee20d0a | 1686 | credits = min_not_zero(dma_credits, nhi->sw->max_dma_credits); |
44242d6c | 1687 | |
180b0689 | 1688 | if (receive_ring > 0) { |
5bf722df MW |
1689 | path = tb_path_alloc(tb, dst, receive_path, nhi, receive_ring, 0, |
1690 | "DMA RX"); | |
6ed541c5 MW |
1691 | if (!path) |
1692 | goto err_free; | |
5bf722df | 1693 | tunnel->paths[i++] = path; |
6ed541c5 MW |
1694 | if (tb_dma_init_rx_path(path, credits)) { |
1695 | tb_tunnel_dbg(tunnel, "not enough buffers for RX path\n"); | |
1696 | goto err_free; | |
1697 | } | |
44242d6c | 1698 | } |
44242d6c | 1699 | |
180b0689 | 1700 | if (transmit_ring > 0) { |
5bf722df MW |
1701 | path = tb_path_alloc(tb, nhi, transmit_ring, dst, transmit_path, 0, |
1702 | "DMA TX"); | |
6ed541c5 MW |
1703 | if (!path) |
1704 | goto err_free; | |
5bf722df | 1705 | tunnel->paths[i++] = path; |
6ed541c5 MW |
1706 | if (tb_dma_init_tx_path(path, credits)) { |
1707 | tb_tunnel_dbg(tunnel, "not enough buffers for TX path\n"); | |
1708 | goto err_free; | |
1709 | } | |
44242d6c | 1710 | } |
44242d6c MW |
1711 | |
1712 | return tunnel; | |
6ed541c5 MW |
1713 | |
1714 | err_free: | |
1715 | tb_tunnel_free(tunnel); | |
1716 | return NULL; | |
44242d6c MW |
1717 | } |
1718 | ||
180b0689 MW |
1719 | /** |
1720 | * tb_tunnel_match_dma() - Match DMA tunnel | |
1721 | * @tunnel: Tunnel to match | |
1722 | * @transmit_path: HopID used for transmitting packets. Pass %-1 to ignore. | |
1723 | * @transmit_ring: NHI ring number used to send packets towards the | |
1724 | * other domain. Pass %-1 to ignore. | |
1725 | * @receive_path: HopID used for receiving packets. Pass %-1 to ignore. | |
1726 | * @receive_ring: NHI ring number used to receive packets from the | |
1727 | * other domain. Pass %-1 to ignore. | |
1728 | * | |
1729 | * This function can be used to match specific DMA tunnel, if there are | |
1730 | * multiple DMA tunnels going through the same XDomain connection. | |
1731 | * Returns true if there is match and false otherwise. | |
1732 | */ | |
1733 | bool tb_tunnel_match_dma(const struct tb_tunnel *tunnel, int transmit_path, | |
1734 | int transmit_ring, int receive_path, int receive_ring) | |
1735 | { | |
1736 | const struct tb_path *tx_path = NULL, *rx_path = NULL; | |
1737 | int i; | |
1738 | ||
1739 | if (!receive_ring || !transmit_ring) | |
1740 | return false; | |
1741 | ||
1742 | for (i = 0; i < tunnel->npaths; i++) { | |
1743 | const struct tb_path *path = tunnel->paths[i]; | |
1744 | ||
1745 | if (!path) | |
1746 | continue; | |
1747 | ||
1748 | if (tb_port_is_nhi(path->hops[0].in_port)) | |
1749 | tx_path = path; | |
1750 | else if (tb_port_is_nhi(path->hops[path->path_length - 1].out_port)) | |
1751 | rx_path = path; | |
1752 | } | |
1753 | ||
1754 | if (transmit_ring > 0 || transmit_path > 0) { | |
1755 | if (!tx_path) | |
1756 | return false; | |
1757 | if (transmit_ring > 0 && | |
1758 | (tx_path->hops[0].in_hop_index != transmit_ring)) | |
1759 | return false; | |
1760 | if (transmit_path > 0 && | |
1761 | (tx_path->hops[tx_path->path_length - 1].next_hop_index != transmit_path)) | |
1762 | return false; | |
1763 | } | |
1764 | ||
1765 | if (receive_ring > 0 || receive_path > 0) { | |
1766 | if (!rx_path) | |
1767 | return false; | |
1768 | if (receive_path > 0 && | |
1769 | (rx_path->hops[0].in_hop_index != receive_path)) | |
1770 | return false; | |
1771 | if (receive_ring > 0 && | |
1772 | (rx_path->hops[rx_path->path_length - 1].next_hop_index != receive_ring)) | |
1773 | return false; | |
1774 | } | |
1775 | ||
1776 | return true; | |
1777 | } | |
1778 | ||
0bd680cd MW |
1779 | static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down) |
1780 | { | |
1781 | int ret, up_max_rate, down_max_rate; | |
1782 | ||
1783 | ret = usb4_usb3_port_max_link_rate(up); | |
1784 | if (ret < 0) | |
1785 | return ret; | |
1786 | up_max_rate = ret; | |
1787 | ||
1788 | ret = usb4_usb3_port_max_link_rate(down); | |
1789 | if (ret < 0) | |
1790 | return ret; | |
1791 | down_max_rate = ret; | |
1792 | ||
1793 | return min(up_max_rate, down_max_rate); | |
1794 | } | |
1795 | ||
1796 | static int tb_usb3_init(struct tb_tunnel *tunnel) | |
1797 | { | |
1798 | tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n", | |
1799 | tunnel->allocated_up, tunnel->allocated_down); | |
1800 | ||
1801 | return usb4_usb3_port_allocate_bandwidth(tunnel->src_port, | |
1802 | &tunnel->allocated_up, | |
1803 | &tunnel->allocated_down); | |
1804 | } | |
1805 | ||
e6f81858 RM |
1806 | static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate) |
1807 | { | |
1808 | int res; | |
1809 | ||
1810 | res = tb_usb3_port_enable(tunnel->src_port, activate); | |
1811 | if (res) | |
1812 | return res; | |
1813 | ||
1814 | if (tb_port_is_usb3_up(tunnel->dst_port)) | |
1815 | return tb_usb3_port_enable(tunnel->dst_port, activate); | |
1816 | ||
1817 | return 0; | |
1818 | } | |
1819 | ||
0bd680cd MW |
1820 | static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel, |
1821 | int *consumed_up, int *consumed_down) | |
1822 | { | |
582e70b0 | 1823 | struct tb_port *port = tb_upstream_port(tunnel->dst_port->sw); |
4d24db0c | 1824 | int pcie_weight = tb_acpi_may_tunnel_pcie() ? TB_PCI_WEIGHT : 0; |
c6da62a2 | 1825 | |
0bd680cd | 1826 | /* |
c6da62a2 MW |
1827 | * PCIe tunneling, if enabled, affects the USB3 bandwidth so |
1828 | * take that it into account here. | |
0bd680cd | 1829 | */ |
4d24db0c MW |
1830 | *consumed_up = tunnel->allocated_up * |
1831 | (TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT; | |
1832 | *consumed_down = tunnel->allocated_down * | |
1833 | (TB_USB3_WEIGHT + pcie_weight) / TB_USB3_WEIGHT; | |
1834 | ||
582e70b0 GF |
1835 | if (tb_port_get_link_generation(port) >= 4) { |
1836 | *consumed_up = max(*consumed_up, USB4_V2_USB3_MIN_BANDWIDTH); | |
1837 | *consumed_down = max(*consumed_down, USB4_V2_USB3_MIN_BANDWIDTH); | |
1838 | } | |
1839 | ||
0bd680cd MW |
1840 | return 0; |
1841 | } | |
1842 | ||
1843 | static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel) | |
1844 | { | |
1845 | int ret; | |
1846 | ||
1847 | ret = usb4_usb3_port_release_bandwidth(tunnel->src_port, | |
1848 | &tunnel->allocated_up, | |
1849 | &tunnel->allocated_down); | |
1850 | if (ret) | |
1851 | return ret; | |
1852 | ||
1853 | tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n", | |
1854 | tunnel->allocated_up, tunnel->allocated_down); | |
1855 | return 0; | |
1856 | } | |
1857 | ||
1858 | static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel, | |
1859 | int *available_up, | |
1860 | int *available_down) | |
1861 | { | |
1862 | int ret, max_rate, allocate_up, allocate_down; | |
1863 | ||
92b8f7a1 | 1864 | ret = tb_usb3_max_link_rate(tunnel->dst_port, tunnel->src_port); |
813050e0 | 1865 | if (ret < 0) { |
92b8f7a1 | 1866 | tb_tunnel_warn(tunnel, "failed to read maximum link rate\n"); |
0bd680cd MW |
1867 | return; |
1868 | } | |
813050e0 | 1869 | |
0bd680cd MW |
1870 | /* |
1871 | * 90% of the max rate can be allocated for isochronous | |
1872 | * transfers. | |
1873 | */ | |
1874 | max_rate = ret * 90 / 100; | |
1875 | ||
1876 | /* No need to reclaim if already at maximum */ | |
1877 | if (tunnel->allocated_up >= max_rate && | |
1878 | tunnel->allocated_down >= max_rate) | |
1879 | return; | |
1880 | ||
1881 | /* Don't go lower than what is already allocated */ | |
1882 | allocate_up = min(max_rate, *available_up); | |
1883 | if (allocate_up < tunnel->allocated_up) | |
1884 | allocate_up = tunnel->allocated_up; | |
1885 | ||
1886 | allocate_down = min(max_rate, *available_down); | |
1887 | if (allocate_down < tunnel->allocated_down) | |
1888 | allocate_down = tunnel->allocated_down; | |
1889 | ||
1890 | /* If no changes no need to do more */ | |
1891 | if (allocate_up == tunnel->allocated_up && | |
1892 | allocate_down == tunnel->allocated_down) | |
1893 | return; | |
1894 | ||
1895 | ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up, | |
1896 | &allocate_down); | |
1897 | if (ret) { | |
1898 | tb_tunnel_info(tunnel, "failed to allocate bandwidth\n"); | |
1899 | return; | |
1900 | } | |
1901 | ||
1902 | tunnel->allocated_up = allocate_up; | |
1903 | *available_up -= tunnel->allocated_up; | |
1904 | ||
1905 | tunnel->allocated_down = allocate_down; | |
1906 | *available_down -= tunnel->allocated_down; | |
1907 | ||
1908 | tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n", | |
1909 | tunnel->allocated_up, tunnel->allocated_down); | |
1910 | } | |
1911 | ||
6ed541c5 MW |
1912 | static void tb_usb3_init_credits(struct tb_path_hop *hop) |
1913 | { | |
1914 | struct tb_port *port = hop->in_port; | |
1915 | struct tb_switch *sw = port->sw; | |
1916 | unsigned int credits; | |
1917 | ||
1918 | if (tb_port_use_credit_allocation(port)) { | |
1919 | credits = sw->max_usb3_credits; | |
1920 | } else { | |
1921 | if (tb_port_is_null(port)) | |
1922 | credits = port->bonded ? 32 : 16; | |
1923 | else | |
1924 | credits = 7; | |
1925 | } | |
1926 | ||
1927 | hop->initial_credits = credits; | |
1928 | } | |
1929 | ||
e6f81858 RM |
1930 | static void tb_usb3_init_path(struct tb_path *path) |
1931 | { | |
6ed541c5 MW |
1932 | struct tb_path_hop *hop; |
1933 | ||
e6f81858 RM |
1934 | path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL; |
1935 | path->egress_shared_buffer = TB_PATH_NONE; | |
1936 | path->ingress_fc_enable = TB_PATH_ALL; | |
1937 | path->ingress_shared_buffer = TB_PATH_NONE; | |
f73edddf MW |
1938 | path->priority = TB_USB3_PRIORITY; |
1939 | path->weight = TB_USB3_WEIGHT; | |
e6f81858 | 1940 | path->drop_packages = 0; |
6ed541c5 MW |
1941 | |
1942 | tb_path_for_each_hop(path, hop) | |
1943 | tb_usb3_init_credits(hop); | |
e6f81858 RM |
1944 | } |
1945 | ||
1946 | /** | |
1947 | * tb_tunnel_discover_usb3() - Discover existing USB3 tunnels | |
1948 | * @tb: Pointer to the domain structure | |
1949 | * @down: USB3 downstream adapter | |
43bddb26 | 1950 | * @alloc_hopid: Allocate HopIDs from visited ports |
e6f81858 RM |
1951 | * |
1952 | * If @down adapter is active, follows the tunnel to the USB3 upstream | |
1953 | * adapter and back. Returns the discovered tunnel or %NULL if there was | |
1954 | * no tunnel. | |
1955 | */ | |
43bddb26 MW |
1956 | struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down, |
1957 | bool alloc_hopid) | |
e6f81858 RM |
1958 | { |
1959 | struct tb_tunnel *tunnel; | |
1960 | struct tb_path *path; | |
1961 | ||
1962 | if (!tb_usb3_port_is_enabled(down)) | |
1963 | return NULL; | |
1964 | ||
1965 | tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3); | |
1966 | if (!tunnel) | |
1967 | return NULL; | |
1968 | ||
1969 | tunnel->activate = tb_usb3_activate; | |
1970 | tunnel->src_port = down; | |
1971 | ||
1972 | /* | |
1973 | * Discover both paths even if they are not complete. We will | |
1974 | * clean them up by calling tb_tunnel_deactivate() below in that | |
1975 | * case. | |
1976 | */ | |
1977 | path = tb_path_discover(down, TB_USB3_HOPID, NULL, -1, | |
43bddb26 | 1978 | &tunnel->dst_port, "USB3 Down", alloc_hopid); |
e6f81858 RM |
1979 | if (!path) { |
1980 | /* Just disable the downstream port */ | |
1981 | tb_usb3_port_enable(down, false); | |
1982 | goto err_free; | |
1983 | } | |
783735f8 MW |
1984 | tunnel->paths[TB_USB3_PATH_DOWN] = path; |
1985 | tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_DOWN]); | |
e6f81858 RM |
1986 | |
1987 | path = tb_path_discover(tunnel->dst_port, -1, down, TB_USB3_HOPID, NULL, | |
43bddb26 | 1988 | "USB3 Up", alloc_hopid); |
e6f81858 RM |
1989 | if (!path) |
1990 | goto err_deactivate; | |
783735f8 MW |
1991 | tunnel->paths[TB_USB3_PATH_UP] = path; |
1992 | tb_usb3_init_path(tunnel->paths[TB_USB3_PATH_UP]); | |
e6f81858 RM |
1993 | |
1994 | /* Validate that the tunnel is complete */ | |
1995 | if (!tb_port_is_usb3_up(tunnel->dst_port)) { | |
1996 | tb_port_warn(tunnel->dst_port, | |
1997 | "path does not end on an USB3 adapter, cleaning up\n"); | |
1998 | goto err_deactivate; | |
1999 | } | |
2000 | ||
2001 | if (down != tunnel->src_port) { | |
2002 | tb_tunnel_warn(tunnel, "path is not complete, cleaning up\n"); | |
2003 | goto err_deactivate; | |
2004 | } | |
2005 | ||
2006 | if (!tb_usb3_port_is_enabled(tunnel->dst_port)) { | |
2007 | tb_tunnel_warn(tunnel, | |
2008 | "tunnel is not fully activated, cleaning up\n"); | |
2009 | goto err_deactivate; | |
2010 | } | |
2011 | ||
0bd680cd MW |
2012 | if (!tb_route(down->sw)) { |
2013 | int ret; | |
2014 | ||
2015 | /* | |
2016 | * Read the initial bandwidth allocation for the first | |
2017 | * hop tunnel. | |
2018 | */ | |
2019 | ret = usb4_usb3_port_allocated_bandwidth(down, | |
2020 | &tunnel->allocated_up, &tunnel->allocated_down); | |
2021 | if (ret) | |
2022 | goto err_deactivate; | |
2023 | ||
2024 | tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n", | |
2025 | tunnel->allocated_up, tunnel->allocated_down); | |
2026 | ||
2027 | tunnel->init = tb_usb3_init; | |
2028 | tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth; | |
2029 | tunnel->release_unused_bandwidth = | |
2030 | tb_usb3_release_unused_bandwidth; | |
2031 | tunnel->reclaim_available_bandwidth = | |
2032 | tb_usb3_reclaim_available_bandwidth; | |
2033 | } | |
2034 | ||
e6f81858 RM |
2035 | tb_tunnel_dbg(tunnel, "discovered\n"); |
2036 | return tunnel; | |
2037 | ||
2038 | err_deactivate: | |
2039 | tb_tunnel_deactivate(tunnel); | |
2040 | err_free: | |
2041 | tb_tunnel_free(tunnel); | |
2042 | ||
2043 | return NULL; | |
2044 | } | |
2045 | ||
2046 | /** | |
2047 | * tb_tunnel_alloc_usb3() - allocate a USB3 tunnel | |
2048 | * @tb: Pointer to the domain structure | |
2049 | * @up: USB3 upstream adapter port | |
2050 | * @down: USB3 downstream adapter port | |
0bd680cd MW |
2051 | * @max_up: Maximum available upstream bandwidth for the USB3 tunnel (%0 |
2052 | * if not limited). | |
2053 | * @max_down: Maximum available downstream bandwidth for the USB3 tunnel | |
2054 | * (%0 if not limited). | |
e6f81858 RM |
2055 | * |
2056 | * Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and | |
2057 | * @TB_TYPE_USB3_DOWN. | |
2058 | * | |
2059 | * Return: Returns a tb_tunnel on success or %NULL on failure. | |
2060 | */ | |
2061 | struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up, | |
0bd680cd MW |
2062 | struct tb_port *down, int max_up, |
2063 | int max_down) | |
e6f81858 RM |
2064 | { |
2065 | struct tb_tunnel *tunnel; | |
2066 | struct tb_path *path; | |
0bd680cd MW |
2067 | int max_rate = 0; |
2068 | ||
2069 | /* | |
2070 | * Check that we have enough bandwidth available for the new | |
2071 | * USB3 tunnel. | |
2072 | */ | |
2073 | if (max_up > 0 || max_down > 0) { | |
2074 | max_rate = tb_usb3_max_link_rate(down, up); | |
2075 | if (max_rate < 0) | |
2076 | return NULL; | |
2077 | ||
2078 | /* Only 90% can be allocated for USB3 isochronous transfers */ | |
2079 | max_rate = max_rate * 90 / 100; | |
2080 | tb_port_dbg(up, "required bandwidth for USB3 tunnel %d Mb/s\n", | |
2081 | max_rate); | |
2082 | ||
2083 | if (max_rate > max_up || max_rate > max_down) { | |
2084 | tb_port_warn(up, "not enough bandwidth for USB3 tunnel\n"); | |
2085 | return NULL; | |
2086 | } | |
2087 | } | |
e6f81858 RM |
2088 | |
2089 | tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3); | |
2090 | if (!tunnel) | |
2091 | return NULL; | |
2092 | ||
2093 | tunnel->activate = tb_usb3_activate; | |
2094 | tunnel->src_port = down; | |
2095 | tunnel->dst_port = up; | |
0bd680cd MW |
2096 | tunnel->max_up = max_up; |
2097 | tunnel->max_down = max_down; | |
e6f81858 RM |
2098 | |
2099 | path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0, | |
2100 | "USB3 Down"); | |
2101 | if (!path) { | |
2102 | tb_tunnel_free(tunnel); | |
2103 | return NULL; | |
2104 | } | |
2105 | tb_usb3_init_path(path); | |
2106 | tunnel->paths[TB_USB3_PATH_DOWN] = path; | |
2107 | ||
2108 | path = tb_path_alloc(tb, up, TB_USB3_HOPID, down, TB_USB3_HOPID, 0, | |
2109 | "USB3 Up"); | |
2110 | if (!path) { | |
2111 | tb_tunnel_free(tunnel); | |
2112 | return NULL; | |
2113 | } | |
2114 | tb_usb3_init_path(path); | |
2115 | tunnel->paths[TB_USB3_PATH_UP] = path; | |
2116 | ||
0bd680cd MW |
2117 | if (!tb_route(down->sw)) { |
2118 | tunnel->allocated_up = max_rate; | |
2119 | tunnel->allocated_down = max_rate; | |
2120 | ||
2121 | tunnel->init = tb_usb3_init; | |
2122 | tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth; | |
2123 | tunnel->release_unused_bandwidth = | |
2124 | tb_usb3_release_unused_bandwidth; | |
2125 | tunnel->reclaim_available_bandwidth = | |
2126 | tb_usb3_reclaim_available_bandwidth; | |
2127 | } | |
2128 | ||
e6f81858 RM |
2129 | return tunnel; |
2130 | } | |
2131 | ||
3364f0c1 | 2132 | /** |
93f36ade MW |
2133 | * tb_tunnel_free() - free a tunnel |
2134 | * @tunnel: Tunnel to be freed | |
3364f0c1 | 2135 | * |
ab9f31cf | 2136 | * Frees a tunnel. The tunnel does not need to be deactivated. |
3364f0c1 | 2137 | */ |
93f36ade | 2138 | void tb_tunnel_free(struct tb_tunnel *tunnel) |
3364f0c1 | 2139 | { |
93f36ade MW |
2140 | int i; |
2141 | ||
2142 | if (!tunnel) | |
3364f0c1 | 2143 | return; |
93f36ade | 2144 | |
6ed541c5 MW |
2145 | if (tunnel->deinit) |
2146 | tunnel->deinit(tunnel); | |
2147 | ||
93f36ade MW |
2148 | for (i = 0; i < tunnel->npaths; i++) { |
2149 | if (tunnel->paths[i]) | |
2150 | tb_path_free(tunnel->paths[i]); | |
2151 | } | |
2152 | ||
2153 | kfree(tunnel->paths); | |
3364f0c1 AN |
2154 | kfree(tunnel); |
2155 | } | |
2156 | ||
2157 | /** | |
93f36ade MW |
2158 | * tb_tunnel_is_invalid - check whether an activated path is still valid |
2159 | * @tunnel: Tunnel to check | |
3364f0c1 | 2160 | */ |
93f36ade | 2161 | bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel) |
3364f0c1 | 2162 | { |
93f36ade | 2163 | int i; |
3364f0c1 | 2164 | |
93f36ade MW |
2165 | for (i = 0; i < tunnel->npaths; i++) { |
2166 | WARN_ON(!tunnel->paths[i]->activated); | |
2167 | if (tb_path_is_invalid(tunnel->paths[i])) | |
2168 | return true; | |
2169 | } | |
3364f0c1 | 2170 | |
93f36ade | 2171 | return false; |
3364f0c1 AN |
2172 | } |
2173 | ||
2174 | /** | |
93f36ade MW |
2175 | * tb_tunnel_restart() - activate a tunnel after a hardware reset |
2176 | * @tunnel: Tunnel to restart | |
2177 | * | |
2178 | * Return: 0 on success and negative errno in case if failure | |
3364f0c1 | 2179 | */ |
93f36ade | 2180 | int tb_tunnel_restart(struct tb_tunnel *tunnel) |
3364f0c1 | 2181 | { |
93f36ade | 2182 | int res, i; |
3364f0c1 | 2183 | |
62efe699 | 2184 | tb_tunnel_dbg(tunnel, "activating\n"); |
3364f0c1 | 2185 | |
aae9e27f MW |
2186 | /* |
2187 | * Make sure all paths are properly disabled before enabling | |
2188 | * them again. | |
2189 | */ | |
2190 | for (i = 0; i < tunnel->npaths; i++) { | |
2191 | if (tunnel->paths[i]->activated) { | |
2192 | tb_path_deactivate(tunnel->paths[i]); | |
2193 | tunnel->paths[i]->activated = false; | |
2194 | } | |
2195 | } | |
2196 | ||
4f807e47 MW |
2197 | if (tunnel->init) { |
2198 | res = tunnel->init(tunnel); | |
2199 | if (res) | |
2200 | return res; | |
2201 | } | |
2202 | ||
93f36ade | 2203 | for (i = 0; i < tunnel->npaths; i++) { |
93f36ade MW |
2204 | res = tb_path_activate(tunnel->paths[i]); |
2205 | if (res) | |
2206 | goto err; | |
2207 | } | |
3364f0c1 | 2208 | |
93f36ade MW |
2209 | if (tunnel->activate) { |
2210 | res = tunnel->activate(tunnel, true); | |
2211 | if (res) | |
2212 | goto err; | |
2213 | } | |
3364f0c1 | 2214 | |
3364f0c1 | 2215 | return 0; |
93f36ade | 2216 | |
3364f0c1 AN |
2217 | err: |
2218 | tb_tunnel_warn(tunnel, "activation failed\n"); | |
93f36ade | 2219 | tb_tunnel_deactivate(tunnel); |
3364f0c1 AN |
2220 | return res; |
2221 | } | |
2222 | ||
2223 | /** | |
93f36ade MW |
2224 | * tb_tunnel_activate() - activate a tunnel |
2225 | * @tunnel: Tunnel to activate | |
3364f0c1 AN |
2226 | * |
2227 | * Return: Returns 0 on success or an error code on failure. | |
2228 | */ | |
93f36ade | 2229 | int tb_tunnel_activate(struct tb_tunnel *tunnel) |
3364f0c1 | 2230 | { |
93f36ade | 2231 | int i; |
3364f0c1 | 2232 | |
93f36ade MW |
2233 | for (i = 0; i < tunnel->npaths; i++) { |
2234 | if (tunnel->paths[i]->activated) { | |
2235 | tb_tunnel_WARN(tunnel, | |
2236 | "trying to activate an already activated tunnel\n"); | |
2237 | return -EINVAL; | |
2238 | } | |
2239 | } | |
3364f0c1 | 2240 | |
93f36ade MW |
2241 | return tb_tunnel_restart(tunnel); |
2242 | } | |
3364f0c1 AN |
2243 | |
2244 | /** | |
93f36ade MW |
2245 | * tb_tunnel_deactivate() - deactivate a tunnel |
2246 | * @tunnel: Tunnel to deactivate | |
3364f0c1 | 2247 | */ |
93f36ade | 2248 | void tb_tunnel_deactivate(struct tb_tunnel *tunnel) |
3364f0c1 | 2249 | { |
93f36ade MW |
2250 | int i; |
2251 | ||
62efe699 | 2252 | tb_tunnel_dbg(tunnel, "deactivating\n"); |
3364f0c1 | 2253 | |
93f36ade MW |
2254 | if (tunnel->activate) |
2255 | tunnel->activate(tunnel, false); | |
2256 | ||
2257 | for (i = 0; i < tunnel->npaths; i++) { | |
0414bec5 | 2258 | if (tunnel->paths[i] && tunnel->paths[i]->activated) |
93f36ade MW |
2259 | tb_path_deactivate(tunnel->paths[i]); |
2260 | } | |
2261 | } | |
a11b88ad MW |
2262 | |
2263 | /** | |
0bd680cd | 2264 | * tb_tunnel_port_on_path() - Does the tunnel go through port |
a11b88ad | 2265 | * @tunnel: Tunnel to check |
0bd680cd | 2266 | * @port: Port to check |
a11b88ad | 2267 | * |
0bd680cd | 2268 | * Returns true if @tunnel goes through @port (direction does not matter), |
a11b88ad MW |
2269 | * false otherwise. |
2270 | */ | |
0bd680cd MW |
2271 | bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel, |
2272 | const struct tb_port *port) | |
a11b88ad MW |
2273 | { |
2274 | int i; | |
2275 | ||
2276 | for (i = 0; i < tunnel->npaths; i++) { | |
2277 | if (!tunnel->paths[i]) | |
2278 | continue; | |
0bd680cd MW |
2279 | |
2280 | if (tb_path_port_on_path(tunnel->paths[i], port)) | |
a11b88ad MW |
2281 | return true; |
2282 | } | |
2283 | ||
2284 | return false; | |
2285 | } | |
2286 | ||
2287 | static bool tb_tunnel_is_active(const struct tb_tunnel *tunnel) | |
2288 | { | |
2289 | int i; | |
2290 | ||
2291 | for (i = 0; i < tunnel->npaths; i++) { | |
2292 | if (!tunnel->paths[i]) | |
2293 | return false; | |
2294 | if (!tunnel->paths[i]->activated) | |
2295 | return false; | |
2296 | } | |
2297 | ||
2298 | return true; | |
2299 | } | |
2300 | ||
06cbcbfa MW |
2301 | /** |
2302 | * tb_tunnel_maximum_bandwidth() - Return maximum possible bandwidth | |
2303 | * @tunnel: Tunnel to check | |
2304 | * @max_up: Maximum upstream bandwidth in Mb/s | |
2305 | * @max_down: Maximum downstream bandwidth in Mb/s | |
2306 | * | |
2307 | * Returns maximum possible bandwidth this tunnel can go if not limited | |
2308 | * by other bandwidth clients. If the tunnel does not support this | |
2309 | * returns %-EOPNOTSUPP. | |
2310 | */ | |
6ce35635 MW |
2311 | int tb_tunnel_maximum_bandwidth(struct tb_tunnel *tunnel, int *max_up, |
2312 | int *max_down) | |
2313 | { | |
2314 | if (!tb_tunnel_is_active(tunnel)) | |
2315 | return -EINVAL; | |
2316 | ||
2317 | if (tunnel->maximum_bandwidth) | |
2318 | return tunnel->maximum_bandwidth(tunnel, max_up, max_down); | |
2319 | return -EOPNOTSUPP; | |
2320 | } | |
2321 | ||
2322 | /** | |
2323 | * tb_tunnel_allocated_bandwidth() - Return bandwidth allocated for the tunnel | |
2324 | * @tunnel: Tunnel to check | |
2325 | * @allocated_up: Currently allocated upstream bandwidth in Mb/s is stored here | |
2326 | * @allocated_down: Currently allocated downstream bandwidth in Mb/s is | |
2327 | * stored here | |
2328 | * | |
2329 | * Returns the bandwidth allocated for the tunnel. This may be higher | |
2330 | * than what the tunnel actually consumes. | |
2331 | */ | |
2332 | int tb_tunnel_allocated_bandwidth(struct tb_tunnel *tunnel, int *allocated_up, | |
2333 | int *allocated_down) | |
2334 | { | |
2335 | if (!tb_tunnel_is_active(tunnel)) | |
2336 | return -EINVAL; | |
2337 | ||
2338 | if (tunnel->allocated_bandwidth) | |
2339 | return tunnel->allocated_bandwidth(tunnel, allocated_up, | |
2340 | allocated_down); | |
2341 | return -EOPNOTSUPP; | |
2342 | } | |
2343 | ||
2344 | /** | |
2345 | * tb_tunnel_alloc_bandwidth() - Change tunnel bandwidth allocation | |
2346 | * @tunnel: Tunnel whose bandwidth allocation to change | |
2347 | * @alloc_up: New upstream bandwidth in Mb/s | |
2348 | * @alloc_down: New downstream bandwidth in Mb/s | |
2349 | * | |
2350 | * Tries to change tunnel bandwidth allocation. If succeeds returns %0 | |
2351 | * and updates @alloc_up and @alloc_down to that was actually allocated | |
2352 | * (it may not be the same as passed originally). Returns negative errno | |
2353 | * in case of failure. | |
2354 | */ | |
2355 | int tb_tunnel_alloc_bandwidth(struct tb_tunnel *tunnel, int *alloc_up, | |
2356 | int *alloc_down) | |
2357 | { | |
2358 | if (!tb_tunnel_is_active(tunnel)) | |
2359 | return -EINVAL; | |
2360 | ||
2361 | if (tunnel->alloc_bandwidth) | |
2362 | return tunnel->alloc_bandwidth(tunnel, alloc_up, alloc_down); | |
2363 | ||
2364 | return -EOPNOTSUPP; | |
2365 | } | |
2366 | ||
a11b88ad MW |
2367 | /** |
2368 | * tb_tunnel_consumed_bandwidth() - Return bandwidth consumed by the tunnel | |
2369 | * @tunnel: Tunnel to check | |
7c0ee8fd MW |
2370 | * @consumed_up: Consumed bandwidth in Mb/s from @dst_port to @src_port. |
2371 | * Can be %NULL. | |
2372 | * @consumed_down: Consumed bandwidth in Mb/s from @src_port to @dst_port. | |
2373 | * Can be %NULL. | |
a11b88ad | 2374 | * |
7c0ee8fd MW |
2375 | * Stores the amount of isochronous bandwidth @tunnel consumes in |
2376 | * @consumed_up and @consumed_down. In case of success returns %0, | |
2377 | * negative errno otherwise. | |
a11b88ad | 2378 | */ |
7c0ee8fd MW |
2379 | int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up, |
2380 | int *consumed_down) | |
a11b88ad | 2381 | { |
7c0ee8fd MW |
2382 | int up_bw = 0, down_bw = 0; |
2383 | ||
a11b88ad | 2384 | if (!tb_tunnel_is_active(tunnel)) |
7c0ee8fd | 2385 | goto out; |
a11b88ad MW |
2386 | |
2387 | if (tunnel->consumed_bandwidth) { | |
7c0ee8fd | 2388 | int ret; |
a11b88ad | 2389 | |
7c0ee8fd MW |
2390 | ret = tunnel->consumed_bandwidth(tunnel, &up_bw, &down_bw); |
2391 | if (ret) | |
2392 | return ret; | |
2393 | ||
2394 | tb_tunnel_dbg(tunnel, "consumed bandwidth %d/%d Mb/s\n", up_bw, | |
2395 | down_bw); | |
a11b88ad MW |
2396 | } |
2397 | ||
7c0ee8fd MW |
2398 | out: |
2399 | if (consumed_up) | |
2400 | *consumed_up = up_bw; | |
2401 | if (consumed_down) | |
2402 | *consumed_down = down_bw; | |
2403 | ||
a11b88ad MW |
2404 | return 0; |
2405 | } | |
0bd680cd MW |
2406 | |
2407 | /** | |
2408 | * tb_tunnel_release_unused_bandwidth() - Release unused bandwidth | |
2409 | * @tunnel: Tunnel whose unused bandwidth to release | |
2410 | * | |
2411 | * If tunnel supports dynamic bandwidth management (USB3 tunnels at the | |
2412 | * moment) this function makes it to release all the unused bandwidth. | |
2413 | * | |
2414 | * Returns %0 in case of success and negative errno otherwise. | |
2415 | */ | |
2416 | int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel) | |
2417 | { | |
2418 | if (!tb_tunnel_is_active(tunnel)) | |
2419 | return 0; | |
2420 | ||
2421 | if (tunnel->release_unused_bandwidth) { | |
2422 | int ret; | |
2423 | ||
2424 | ret = tunnel->release_unused_bandwidth(tunnel); | |
2425 | if (ret) | |
2426 | return ret; | |
2427 | } | |
2428 | ||
2429 | return 0; | |
2430 | } | |
2431 | ||
2432 | /** | |
2433 | * tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth | |
2434 | * @tunnel: Tunnel reclaiming available bandwidth | |
2435 | * @available_up: Available upstream bandwidth (in Mb/s) | |
2436 | * @available_down: Available downstream bandwidth (in Mb/s) | |
2437 | * | |
2438 | * Reclaims bandwidth from @available_up and @available_down and updates | |
2439 | * the variables accordingly (e.g decreases both according to what was | |
2440 | * reclaimed by the tunnel). If nothing was reclaimed the values are | |
2441 | * kept as is. | |
2442 | */ | |
2443 | void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel, | |
2444 | int *available_up, | |
2445 | int *available_down) | |
2446 | { | |
2447 | if (!tb_tunnel_is_active(tunnel)) | |
2448 | return; | |
2449 | ||
2450 | if (tunnel->reclaim_available_bandwidth) | |
2451 | tunnel->reclaim_available_bandwidth(tunnel, available_up, | |
2452 | available_down); | |
2453 | } | |
d27bd2c3 MW |
2454 | |
2455 | const char *tb_tunnel_type_name(const struct tb_tunnel *tunnel) | |
2456 | { | |
2457 | return tb_tunnel_names[tunnel->type]; | |
2458 | } |