blob: a8572f49d3adc42e65998f3cd38e60443ef7ca87 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Andreas Noevera25c8b22014-06-03 22:04:02 +02002/*
Mika Westerberg15c67842018-10-01 12:31:22 +03003 * Thunderbolt driver - switch/port utility functions
Andreas Noevera25c8b22014-06-03 22:04:02 +02004 *
5 * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
Mika Westerberg15c67842018-10-01 12:31:22 +03006 * Copyright (C) 2018, Intel Corporation
Andreas Noevera25c8b22014-06-03 22:04:02 +02007 */
8
9#include <linux/delay.h>
Mika Westerberge6b245c2017-06-06 15:25:17 +030010#include <linux/idr.h>
11#include <linux/nvmem-provider.h>
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +030012#include <linux/pm_runtime.h>
Mika Westerberg09f11b62019-03-19 16:48:41 +020013#include <linux/sched/signal.h>
Mika Westerberge6b245c2017-06-06 15:25:17 +030014#include <linux/sizes.h>
Sachin Kamat10fefe52014-06-20 14:32:30 +053015#include <linux/slab.h>
Andreas Noevera25c8b22014-06-03 22:04:02 +020016
17#include "tb.h"
18
Mika Westerberge6b245c2017-06-06 15:25:17 +030019/* Switch NVM support */
20
Mika Westerberge6b245c2017-06-06 15:25:17 +030021#define NVM_CSS 0x10
Mika Westerberge6b245c2017-06-06 15:25:17 +030022
23struct nvm_auth_status {
24 struct list_head list;
Christoph Hellwig7c39ffe2017-07-18 15:30:05 +020025 uuid_t uuid;
Mika Westerberge6b245c2017-06-06 15:25:17 +030026 u32 status;
27};
28
Mario Limonciello4b794f82020-06-23 11:14:28 -050029enum nvm_write_ops {
30 WRITE_AND_AUTHENTICATE = 1,
31 WRITE_ONLY = 2,
32};
33
Mika Westerberge6b245c2017-06-06 15:25:17 +030034/*
35 * Hold NVM authentication failure status per switch This information
36 * needs to stay around even when the switch gets power cycled so we
37 * keep it separately.
38 */
39static LIST_HEAD(nvm_auth_status_cache);
40static DEFINE_MUTEX(nvm_auth_status_lock);
41
42static struct nvm_auth_status *__nvm_get_auth_status(const struct tb_switch *sw)
43{
44 struct nvm_auth_status *st;
45
46 list_for_each_entry(st, &nvm_auth_status_cache, list) {
Christoph Hellwig7c39ffe2017-07-18 15:30:05 +020047 if (uuid_equal(&st->uuid, sw->uuid))
Mika Westerberge6b245c2017-06-06 15:25:17 +030048 return st;
49 }
50
51 return NULL;
52}
53
54static void nvm_get_auth_status(const struct tb_switch *sw, u32 *status)
55{
56 struct nvm_auth_status *st;
57
58 mutex_lock(&nvm_auth_status_lock);
59 st = __nvm_get_auth_status(sw);
60 mutex_unlock(&nvm_auth_status_lock);
61
62 *status = st ? st->status : 0;
63}
64
65static void nvm_set_auth_status(const struct tb_switch *sw, u32 status)
66{
67 struct nvm_auth_status *st;
68
69 if (WARN_ON(!sw->uuid))
70 return;
71
72 mutex_lock(&nvm_auth_status_lock);
73 st = __nvm_get_auth_status(sw);
74
75 if (!st) {
76 st = kzalloc(sizeof(*st), GFP_KERNEL);
77 if (!st)
78 goto unlock;
79
80 memcpy(&st->uuid, sw->uuid, sizeof(st->uuid));
81 INIT_LIST_HEAD(&st->list);
82 list_add_tail(&st->list, &nvm_auth_status_cache);
83 }
84
85 st->status = status;
86unlock:
87 mutex_unlock(&nvm_auth_status_lock);
88}
89
90static void nvm_clear_auth_status(const struct tb_switch *sw)
91{
92 struct nvm_auth_status *st;
93
94 mutex_lock(&nvm_auth_status_lock);
95 st = __nvm_get_auth_status(sw);
96 if (st) {
97 list_del(&st->list);
98 kfree(st);
99 }
100 mutex_unlock(&nvm_auth_status_lock);
101}
102
103static int nvm_validate_and_write(struct tb_switch *sw)
104{
105 unsigned int image_size, hdr_size;
106 const u8 *buf = sw->nvm->buf;
107 u16 ds_size;
108 int ret;
109
110 if (!buf)
111 return -EINVAL;
112
113 image_size = sw->nvm->buf_data_size;
114 if (image_size < NVM_MIN_SIZE || image_size > NVM_MAX_SIZE)
115 return -EINVAL;
116
117 /*
118 * FARB pointer must point inside the image and must at least
119 * contain parts of the digital section we will be reading here.
120 */
121 hdr_size = (*(u32 *)buf) & 0xffffff;
122 if (hdr_size + NVM_DEVID + 2 >= image_size)
123 return -EINVAL;
124
125 /* Digital section start should be aligned to 4k page */
126 if (!IS_ALIGNED(hdr_size, SZ_4K))
127 return -EINVAL;
128
129 /*
130 * Read digital section size and check that it also fits inside
131 * the image.
132 */
133 ds_size = *(u16 *)(buf + hdr_size);
134 if (ds_size >= image_size)
135 return -EINVAL;
136
137 if (!sw->safe_mode) {
138 u16 device_id;
139
140 /*
141 * Make sure the device ID in the image matches the one
142 * we read from the switch config space.
143 */
144 device_id = *(u16 *)(buf + hdr_size + NVM_DEVID);
145 if (device_id != sw->config.device_id)
146 return -EINVAL;
147
148 if (sw->generation < 3) {
149 /* Write CSS headers first */
150 ret = dma_port_flash_write(sw->dma_port,
151 DMA_PORT_CSS_ADDRESS, buf + NVM_CSS,
152 DMA_PORT_CSS_MAX_SIZE);
153 if (ret)
154 return ret;
155 }
156
157 /* Skip headers in the image */
158 buf += hdr_size;
159 image_size -= hdr_size;
160 }
161
Mika Westerbergb0407982019-12-17 15:33:40 +0300162 if (tb_switch_is_usb4(sw))
Mario Limonciello4b794f82020-06-23 11:14:28 -0500163 ret = usb4_switch_nvm_write(sw, 0, buf, image_size);
164 else
165 ret = dma_port_flash_write(sw->dma_port, 0, buf, image_size);
166 if (!ret)
167 sw->nvm->flushed = true;
168 return ret;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300169}
170
Mika Westerbergb0407982019-12-17 15:33:40 +0300171static int nvm_authenticate_host_dma_port(struct tb_switch *sw)
Mika Westerberge6b245c2017-06-06 15:25:17 +0300172{
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +0300173 int ret = 0;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300174
175 /*
176 * Root switch NVM upgrade requires that we disconnect the
Mika Westerbergd1ff7022017-10-02 13:38:34 +0300177 * existing paths first (in case it is not in safe mode
Mika Westerberge6b245c2017-06-06 15:25:17 +0300178 * already).
179 */
180 if (!sw->safe_mode) {
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +0300181 u32 status;
182
Mika Westerbergd1ff7022017-10-02 13:38:34 +0300183 ret = tb_domain_disconnect_all_paths(sw->tb);
Mika Westerberge6b245c2017-06-06 15:25:17 +0300184 if (ret)
185 return ret;
186 /*
187 * The host controller goes away pretty soon after this if
188 * everything goes well so getting timeout is expected.
189 */
190 ret = dma_port_flash_update_auth(sw->dma_port);
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +0300191 if (!ret || ret == -ETIMEDOUT)
192 return 0;
193
194 /*
195 * Any error from update auth operation requires power
196 * cycling of the host router.
197 */
198 tb_sw_warn(sw, "failed to authenticate NVM, power cycling\n");
199 if (dma_port_flash_update_auth_status(sw->dma_port, &status) > 0)
200 nvm_set_auth_status(sw, status);
Mika Westerberge6b245c2017-06-06 15:25:17 +0300201 }
202
203 /*
204 * From safe mode we can get out by just power cycling the
205 * switch.
206 */
207 dma_port_power_cycle(sw->dma_port);
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +0300208 return ret;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300209}
210
Mika Westerbergb0407982019-12-17 15:33:40 +0300211static int nvm_authenticate_device_dma_port(struct tb_switch *sw)
Mika Westerberge6b245c2017-06-06 15:25:17 +0300212{
213 int ret, retries = 10;
214
215 ret = dma_port_flash_update_auth(sw->dma_port);
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +0300216 switch (ret) {
217 case 0:
218 case -ETIMEDOUT:
219 case -EACCES:
220 case -EINVAL:
221 /* Power cycle is required */
222 break;
223 default:
Mika Westerberge6b245c2017-06-06 15:25:17 +0300224 return ret;
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +0300225 }
Mika Westerberge6b245c2017-06-06 15:25:17 +0300226
227 /*
228 * Poll here for the authentication status. It takes some time
229 * for the device to respond (we get timeout for a while). Once
230 * we get response the device needs to be power cycled in order
231 * to the new NVM to be taken into use.
232 */
233 do {
234 u32 status;
235
236 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
237 if (ret < 0 && ret != -ETIMEDOUT)
238 return ret;
239 if (ret > 0) {
240 if (status) {
241 tb_sw_warn(sw, "failed to authenticate NVM\n");
242 nvm_set_auth_status(sw, status);
243 }
244
245 tb_sw_info(sw, "power cycling the switch now\n");
246 dma_port_power_cycle(sw->dma_port);
247 return 0;
248 }
249
250 msleep(500);
251 } while (--retries);
252
253 return -ETIMEDOUT;
254}
255
Mika Westerbergb0407982019-12-17 15:33:40 +0300256static void nvm_authenticate_start_dma_port(struct tb_switch *sw)
257{
258 struct pci_dev *root_port;
259
260 /*
261 * During host router NVM upgrade we should not allow root port to
262 * go into D3cold because some root ports cannot trigger PME
263 * itself. To be on the safe side keep the root port in D0 during
264 * the whole upgrade process.
265 */
Yicong Yang6ae72bf2020-05-09 18:19:28 +0800266 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
Mika Westerbergb0407982019-12-17 15:33:40 +0300267 if (root_port)
268 pm_runtime_get_noresume(&root_port->dev);
269}
270
271static void nvm_authenticate_complete_dma_port(struct tb_switch *sw)
272{
273 struct pci_dev *root_port;
274
Yicong Yang6ae72bf2020-05-09 18:19:28 +0800275 root_port = pcie_find_root_port(sw->tb->nhi->pdev);
Mika Westerbergb0407982019-12-17 15:33:40 +0300276 if (root_port)
277 pm_runtime_put(&root_port->dev);
278}
279
280static inline bool nvm_readable(struct tb_switch *sw)
281{
282 if (tb_switch_is_usb4(sw)) {
283 /*
284 * USB4 devices must support NVM operations but it is
285 * optional for hosts. Therefore we query the NVM sector
286 * size here and if it is supported assume NVM
287 * operations are implemented.
288 */
289 return usb4_switch_nvm_sector_size(sw) > 0;
290 }
291
292 /* Thunderbolt 2 and 3 devices support NVM through DMA port */
293 return !!sw->dma_port;
294}
295
296static inline bool nvm_upgradeable(struct tb_switch *sw)
297{
298 if (sw->no_nvm_upgrade)
299 return false;
300 return nvm_readable(sw);
301}
302
303static inline int nvm_read(struct tb_switch *sw, unsigned int address,
304 void *buf, size_t size)
305{
306 if (tb_switch_is_usb4(sw))
307 return usb4_switch_nvm_read(sw, address, buf, size);
308 return dma_port_flash_read(sw->dma_port, address, buf, size);
309}
310
311static int nvm_authenticate(struct tb_switch *sw)
312{
313 int ret;
314
315 if (tb_switch_is_usb4(sw))
316 return usb4_switch_nvm_authenticate(sw);
317
318 if (!tb_route(sw)) {
319 nvm_authenticate_start_dma_port(sw);
320 ret = nvm_authenticate_host_dma_port(sw);
321 } else {
322 ret = nvm_authenticate_device_dma_port(sw);
323 }
324
325 return ret;
326}
327
Mika Westerberge6b245c2017-06-06 15:25:17 +0300328static int tb_switch_nvm_read(void *priv, unsigned int offset, void *val,
329 size_t bytes)
330{
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200331 struct tb_nvm *nvm = priv;
332 struct tb_switch *sw = tb_to_switch(nvm->dev);
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +0300333 int ret;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300334
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +0300335 pm_runtime_get_sync(&sw->dev);
Mika Westerberg4f7c2e02019-05-28 18:56:20 +0300336
337 if (!mutex_trylock(&sw->tb->lock)) {
338 ret = restart_syscall();
339 goto out;
340 }
341
Mika Westerbergb0407982019-12-17 15:33:40 +0300342 ret = nvm_read(sw, offset, val, bytes);
Mika Westerberg4f7c2e02019-05-28 18:56:20 +0300343 mutex_unlock(&sw->tb->lock);
344
345out:
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +0300346 pm_runtime_mark_last_busy(&sw->dev);
347 pm_runtime_put_autosuspend(&sw->dev);
348
349 return ret;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300350}
351
352static int tb_switch_nvm_write(void *priv, unsigned int offset, void *val,
353 size_t bytes)
354{
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200355 struct tb_nvm *nvm = priv;
356 struct tb_switch *sw = tb_to_switch(nvm->dev);
357 int ret;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300358
Mika Westerberg09f11b62019-03-19 16:48:41 +0200359 if (!mutex_trylock(&sw->tb->lock))
360 return restart_syscall();
Mika Westerberge6b245c2017-06-06 15:25:17 +0300361
362 /*
363 * Since writing the NVM image might require some special steps,
364 * for example when CSS headers are written, we cache the image
365 * locally here and handle the special cases when the user asks
366 * us to authenticate the image.
367 */
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200368 ret = tb_nvm_write_buf(nvm, offset, val, bytes);
Mika Westerberg09f11b62019-03-19 16:48:41 +0200369 mutex_unlock(&sw->tb->lock);
Mika Westerberge6b245c2017-06-06 15:25:17 +0300370
371 return ret;
372}
373
Mika Westerberge6b245c2017-06-06 15:25:17 +0300374static int tb_switch_nvm_add(struct tb_switch *sw)
375{
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200376 struct tb_nvm *nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300377 u32 val;
378 int ret;
379
Mika Westerbergb0407982019-12-17 15:33:40 +0300380 if (!nvm_readable(sw))
Mika Westerberge6b245c2017-06-06 15:25:17 +0300381 return 0;
382
Mika Westerbergb0407982019-12-17 15:33:40 +0300383 /*
384 * The NVM format of non-Intel hardware is not known so
385 * currently restrict NVM upgrade for Intel hardware. We may
386 * relax this in the future when we learn other NVM formats.
387 */
Mika Westerberg83d17032020-05-08 11:49:47 +0300388 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL &&
389 sw->config.vendor_id != 0x8087) {
Mika Westerbergb0407982019-12-17 15:33:40 +0300390 dev_info(&sw->dev,
391 "NVM format of vendor %#x is not known, disabling NVM upgrade\n",
392 sw->config.vendor_id);
393 return 0;
394 }
395
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200396 nvm = tb_nvm_alloc(&sw->dev);
397 if (IS_ERR(nvm))
398 return PTR_ERR(nvm);
Mika Westerberge6b245c2017-06-06 15:25:17 +0300399
400 /*
401 * If the switch is in safe-mode the only accessible portion of
402 * the NVM is the non-active one where userspace is expected to
403 * write new functional NVM.
404 */
405 if (!sw->safe_mode) {
406 u32 nvm_size, hdr_size;
407
Mika Westerbergb0407982019-12-17 15:33:40 +0300408 ret = nvm_read(sw, NVM_FLASH_SIZE, &val, sizeof(val));
Mika Westerberge6b245c2017-06-06 15:25:17 +0300409 if (ret)
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200410 goto err_nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300411
412 hdr_size = sw->generation < 3 ? SZ_8K : SZ_16K;
413 nvm_size = (SZ_1M << (val & 7)) / 8;
414 nvm_size = (nvm_size - hdr_size) / 2;
415
Mika Westerbergb0407982019-12-17 15:33:40 +0300416 ret = nvm_read(sw, NVM_VERSION, &val, sizeof(val));
Mika Westerberge6b245c2017-06-06 15:25:17 +0300417 if (ret)
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200418 goto err_nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300419
420 nvm->major = val >> 16;
421 nvm->minor = val >> 8;
422
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200423 ret = tb_nvm_add_active(nvm, nvm_size, tb_switch_nvm_read);
424 if (ret)
425 goto err_nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300426 }
427
Mika Westerberg3f415e52019-02-05 12:51:40 +0300428 if (!sw->no_nvm_upgrade) {
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200429 ret = tb_nvm_add_non_active(nvm, NVM_MAX_SIZE,
430 tb_switch_nvm_write);
431 if (ret)
432 goto err_nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300433 }
Mika Westerberge6b245c2017-06-06 15:25:17 +0300434
Mika Westerberge6b245c2017-06-06 15:25:17 +0300435 sw->nvm = nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300436 return 0;
437
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200438err_nvm:
439 tb_nvm_free(nvm);
Mika Westerberge6b245c2017-06-06 15:25:17 +0300440 return ret;
441}
442
443static void tb_switch_nvm_remove(struct tb_switch *sw)
444{
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200445 struct tb_nvm *nvm;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300446
Mika Westerberge6b245c2017-06-06 15:25:17 +0300447 nvm = sw->nvm;
448 sw->nvm = NULL;
Mika Westerberge6b245c2017-06-06 15:25:17 +0300449
450 if (!nvm)
451 return;
452
453 /* Remove authentication status in case the switch is unplugged */
454 if (!nvm->authenticating)
455 nvm_clear_auth_status(sw);
456
Mika Westerberg719a5fe2020-03-05 11:37:15 +0200457 tb_nvm_free(nvm);
Mika Westerberge6b245c2017-06-06 15:25:17 +0300458}
459
Andreas Noevera25c8b22014-06-03 22:04:02 +0200460/* port utility functions */
461
462static const char *tb_port_type(struct tb_regs_port_header *port)
463{
464 switch (port->type >> 16) {
465 case 0:
466 switch ((u8) port->type) {
467 case 0:
468 return "Inactive";
469 case 1:
470 return "Port";
471 case 2:
472 return "NHI";
473 default:
474 return "unknown";
475 }
476 case 0x2:
477 return "Ethernet";
478 case 0x8:
479 return "SATA";
480 case 0xe:
481 return "DP/HDMI";
482 case 0x10:
483 return "PCIe";
484 case 0x20:
485 return "USB";
486 default:
487 return "unknown";
488 }
489}
490
491static void tb_dump_port(struct tb *tb, struct tb_regs_port_header *port)
492{
Mika Westerbergdaa51402018-10-01 12:31:19 +0300493 tb_dbg(tb,
494 " Port %d: %x:%x (Revision: %d, TB Version: %d, Type: %s (%#x))\n",
495 port->port_number, port->vendor_id, port->device_id,
496 port->revision, port->thunderbolt_version, tb_port_type(port),
497 port->type);
498 tb_dbg(tb, " Max hop id (in/out): %d/%d\n",
499 port->max_in_hop_id, port->max_out_hop_id);
500 tb_dbg(tb, " Max counters: %d\n", port->max_counters);
501 tb_dbg(tb, " NFC Credits: %#x\n", port->nfc_credits);
Andreas Noevera25c8b22014-06-03 22:04:02 +0200502}
503
504/**
Andreas Noever9da672a2014-06-03 22:04:05 +0200505 * tb_port_state() - get connectedness state of a port
Isaac Hazan5cc0df92020-09-24 11:44:01 +0300506 * @port: the port to check
Andreas Noever9da672a2014-06-03 22:04:05 +0200507 *
508 * The port must have a TB_CAP_PHY (i.e. it should be a real port).
509 *
510 * Return: Returns an enum tb_port_state on success or an error code on failure.
511 */
Isaac Hazan5cc0df92020-09-24 11:44:01 +0300512int tb_port_state(struct tb_port *port)
Andreas Noever9da672a2014-06-03 22:04:05 +0200513{
514 struct tb_cap_phy phy;
515 int res;
516 if (port->cap_phy == 0) {
517 tb_port_WARN(port, "does not have a PHY\n");
518 return -EINVAL;
519 }
520 res = tb_port_read(port, &phy, TB_CFG_PORT, port->cap_phy, 2);
521 if (res)
522 return res;
523 return phy.state;
524}
525
526/**
527 * tb_wait_for_port() - wait for a port to become ready
528 *
529 * Wait up to 1 second for a port to reach state TB_PORT_UP. If
530 * wait_if_unplugged is set then we also wait if the port is in state
531 * TB_PORT_UNPLUGGED (it takes a while for the device to be registered after
532 * switch resume). Otherwise we only wait if a device is registered but the link
533 * has not yet been established.
534 *
535 * Return: Returns an error code on failure. Returns 0 if the port is not
536 * connected or failed to reach state TB_PORT_UP within one second. Returns 1
537 * if the port is connected and in state TB_PORT_UP.
538 */
539int tb_wait_for_port(struct tb_port *port, bool wait_if_unplugged)
540{
541 int retries = 10;
542 int state;
543 if (!port->cap_phy) {
544 tb_port_WARN(port, "does not have PHY\n");
545 return -EINVAL;
546 }
547 if (tb_is_upstream_port(port)) {
548 tb_port_WARN(port, "is the upstream port\n");
549 return -EINVAL;
550 }
551
552 while (retries--) {
553 state = tb_port_state(port);
554 if (state < 0)
555 return state;
556 if (state == TB_PORT_DISABLED) {
Mika Westerberg62efe692018-09-17 16:32:13 +0300557 tb_port_dbg(port, "is disabled (state: 0)\n");
Andreas Noever9da672a2014-06-03 22:04:05 +0200558 return 0;
559 }
560 if (state == TB_PORT_UNPLUGGED) {
561 if (wait_if_unplugged) {
562 /* used during resume */
Mika Westerberg62efe692018-09-17 16:32:13 +0300563 tb_port_dbg(port,
564 "is unplugged (state: 7), retrying...\n");
Andreas Noever9da672a2014-06-03 22:04:05 +0200565 msleep(100);
566 continue;
567 }
Mika Westerberg62efe692018-09-17 16:32:13 +0300568 tb_port_dbg(port, "is unplugged (state: 7)\n");
Andreas Noever9da672a2014-06-03 22:04:05 +0200569 return 0;
570 }
571 if (state == TB_PORT_UP) {
Mika Westerberg62efe692018-09-17 16:32:13 +0300572 tb_port_dbg(port, "is connected, link is up (state: 2)\n");
Andreas Noever9da672a2014-06-03 22:04:05 +0200573 return 1;
574 }
575
576 /*
577 * After plug-in the state is TB_PORT_CONNECTING. Give it some
578 * time.
579 */
Mika Westerberg62efe692018-09-17 16:32:13 +0300580 tb_port_dbg(port,
581 "is connected, link is not up (state: %d), retrying...\n",
582 state);
Andreas Noever9da672a2014-06-03 22:04:05 +0200583 msleep(100);
584 }
585 tb_port_warn(port,
586 "failed to reach state TB_PORT_UP. Ignoring port...\n");
587 return 0;
588}
589
590/**
Andreas Noever520b6702014-06-03 22:04:07 +0200591 * tb_port_add_nfc_credits() - add/remove non flow controlled credits to port
592 *
593 * Change the number of NFC credits allocated to @port by @credits. To remove
594 * NFC credits pass a negative amount of credits.
595 *
596 * Return: Returns 0 on success or an error code on failure.
597 */
598int tb_port_add_nfc_credits(struct tb_port *port, int credits)
599{
Mika Westerbergc5ee6fe2018-10-11 11:38:22 +0300600 u32 nfc_credits;
601
602 if (credits == 0 || port->sw->is_unplugged)
Andreas Noever520b6702014-06-03 22:04:07 +0200603 return 0;
Mika Westerbergc5ee6fe2018-10-11 11:38:22 +0300604
Mika Westerbergedfbd682020-08-18 17:10:00 +0300605 /*
606 * USB4 restricts programming NFC buffers to lane adapters only
607 * so skip other ports.
608 */
609 if (tb_switch_is_usb4(port->sw) && !tb_port_is_null(port))
610 return 0;
611
Mika Westerberg8f57d472019-09-06 11:59:00 +0300612 nfc_credits = port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK;
Mika Westerbergc5ee6fe2018-10-11 11:38:22 +0300613 nfc_credits += credits;
614
Mika Westerberg8f57d472019-09-06 11:59:00 +0300615 tb_port_dbg(port, "adding %d NFC credits to %lu", credits,
616 port->config.nfc_credits & ADP_CS_4_NFC_BUFFERS_MASK);
Mika Westerbergc5ee6fe2018-10-11 11:38:22 +0300617
Mika Westerberg8f57d472019-09-06 11:59:00 +0300618 port->config.nfc_credits &= ~ADP_CS_4_NFC_BUFFERS_MASK;
Mika Westerbergc5ee6fe2018-10-11 11:38:22 +0300619 port->config.nfc_credits |= nfc_credits;
620
Andreas Noever520b6702014-06-03 22:04:07 +0200621 return tb_port_write(port, &port->config.nfc_credits,
Mika Westerberg8f57d472019-09-06 11:59:00 +0300622 TB_CFG_PORT, ADP_CS_4, 1);
Andreas Noever520b6702014-06-03 22:04:07 +0200623}
624
625/**
Mika Westerberg44242d62018-09-28 16:35:32 +0300626 * tb_port_set_initial_credits() - Set initial port link credits allocated
627 * @port: Port to set the initial credits
628 * @credits: Number of credits to to allocate
629 *
630 * Set initial credits value to be used for ingress shared buffering.
631 */
632int tb_port_set_initial_credits(struct tb_port *port, u32 credits)
633{
634 u32 data;
635 int ret;
636
Mika Westerberg8f57d472019-09-06 11:59:00 +0300637 ret = tb_port_read(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
Mika Westerberg44242d62018-09-28 16:35:32 +0300638 if (ret)
639 return ret;
640
Mika Westerberg8f57d472019-09-06 11:59:00 +0300641 data &= ~ADP_CS_5_LCA_MASK;
642 data |= (credits << ADP_CS_5_LCA_SHIFT) & ADP_CS_5_LCA_MASK;
Mika Westerberg44242d62018-09-28 16:35:32 +0300643
Mika Westerberg8f57d472019-09-06 11:59:00 +0300644 return tb_port_write(port, &data, TB_CFG_PORT, ADP_CS_5, 1);
Mika Westerberg44242d62018-09-28 16:35:32 +0300645}
646
647/**
Andreas Noever520b6702014-06-03 22:04:07 +0200648 * tb_port_clear_counter() - clear a counter in TB_CFG_COUNTER
649 *
650 * Return: Returns 0 on success or an error code on failure.
651 */
652int tb_port_clear_counter(struct tb_port *port, int counter)
653{
654 u32 zero[3] = { 0, 0, 0 };
Mika Westerberg62efe692018-09-17 16:32:13 +0300655 tb_port_dbg(port, "clearing counter %d\n", counter);
Andreas Noever520b6702014-06-03 22:04:07 +0200656 return tb_port_write(port, zero, TB_CFG_COUNTERS, 3 * counter, 3);
657}
658
659/**
Mika Westerbergb0407982019-12-17 15:33:40 +0300660 * tb_port_unlock() - Unlock downstream port
661 * @port: Port to unlock
662 *
663 * Needed for USB4 but can be called for any CIO/USB4 ports. Makes the
664 * downstream router accessible for CM.
665 */
666int tb_port_unlock(struct tb_port *port)
667{
668 if (tb_switch_is_icm(port->sw))
669 return 0;
670 if (!tb_port_is_null(port))
671 return -EINVAL;
672 if (tb_switch_is_usb4(port->sw))
673 return usb4_port_unlock(port);
674 return 0;
675}
676
Mika Westerberg341d4512020-02-21 12:11:54 +0200677static int __tb_port_enable(struct tb_port *port, bool enable)
678{
679 int ret;
680 u32 phy;
681
682 if (!tb_port_is_null(port))
683 return -EINVAL;
684
685 ret = tb_port_read(port, &phy, TB_CFG_PORT,
686 port->cap_phy + LANE_ADP_CS_1, 1);
687 if (ret)
688 return ret;
689
690 if (enable)
691 phy &= ~LANE_ADP_CS_1_LD;
692 else
693 phy |= LANE_ADP_CS_1_LD;
694
695 return tb_port_write(port, &phy, TB_CFG_PORT,
696 port->cap_phy + LANE_ADP_CS_1, 1);
697}
698
699/**
700 * tb_port_enable() - Enable lane adapter
701 * @port: Port to enable (can be %NULL)
702 *
703 * This is used for lane 0 and 1 adapters to enable it.
704 */
705int tb_port_enable(struct tb_port *port)
706{
707 return __tb_port_enable(port, true);
708}
709
710/**
711 * tb_port_disable() - Disable lane adapter
712 * @port: Port to disable (can be %NULL)
713 *
714 * This is used for lane 0 and 1 adapters to disable it.
715 */
716int tb_port_disable(struct tb_port *port)
717{
718 return __tb_port_enable(port, false);
719}
720
Mika Westerbergb0407982019-12-17 15:33:40 +0300721/**
Andreas Noevera25c8b22014-06-03 22:04:02 +0200722 * tb_init_port() - initialize a port
723 *
724 * This is a helper method for tb_switch_alloc. Does not check or initialize
725 * any downstream switches.
726 *
727 * Return: Returns 0 on success or an error code on failure.
728 */
Andreas Noever343fcb82014-06-12 23:11:47 +0200729static int tb_init_port(struct tb_port *port)
Andreas Noevera25c8b22014-06-03 22:04:02 +0200730{
731 int res;
Andreas Noever9da672a2014-06-03 22:04:05 +0200732 int cap;
Andreas Noever343fcb82014-06-12 23:11:47 +0200733
Andreas Noevera25c8b22014-06-03 22:04:02 +0200734 res = tb_port_read(port, &port->config, TB_CFG_PORT, 0, 8);
Mika Westerbergd94dcbb2018-07-04 08:50:01 +0300735 if (res) {
736 if (res == -ENODEV) {
737 tb_dbg(port->sw->tb, " Port %d: not implemented\n",
738 port->port);
Nikunj A. Dadhania8824d192020-07-21 17:05:23 +0530739 port->disabled = true;
Mika Westerbergd94dcbb2018-07-04 08:50:01 +0300740 return 0;
741 }
Andreas Noevera25c8b22014-06-03 22:04:02 +0200742 return res;
Mika Westerbergd94dcbb2018-07-04 08:50:01 +0300743 }
Andreas Noevera25c8b22014-06-03 22:04:02 +0200744
Andreas Noever9da672a2014-06-03 22:04:05 +0200745 /* Port 0 is the switch itself and has no PHY. */
Andreas Noever343fcb82014-06-12 23:11:47 +0200746 if (port->config.type == TB_TYPE_PORT && port->port != 0) {
Mika Westerbergda2da042017-06-06 15:24:58 +0300747 cap = tb_port_find_cap(port, TB_PORT_CAP_PHY);
Andreas Noever9da672a2014-06-03 22:04:05 +0200748
749 if (cap > 0)
750 port->cap_phy = cap;
751 else
752 tb_port_WARN(port, "non switch port without a PHY\n");
Mika Westerbergb0407982019-12-17 15:33:40 +0300753
754 cap = tb_port_find_cap(port, TB_PORT_CAP_USB4);
755 if (cap > 0)
756 port->cap_usb4 = cap;
Mika Westerberg56183c82017-02-19 10:39:34 +0200757 } else if (port->port != 0) {
758 cap = tb_port_find_cap(port, TB_PORT_CAP_ADAP);
759 if (cap > 0)
760 port->cap_adap = cap;
Andreas Noever9da672a2014-06-03 22:04:05 +0200761 }
762
Andreas Noever343fcb82014-06-12 23:11:47 +0200763 tb_dump_port(port->sw->tb, &port->config);
Andreas Noevera25c8b22014-06-03 22:04:02 +0200764
Mika Westerberg0b2863a2017-02-19 16:57:27 +0200765 /* Control port does not need HopID allocation */
766 if (port->port) {
767 ida_init(&port->in_hopids);
768 ida_init(&port->out_hopids);
769 }
770
Mika Westerberg8afe9092019-03-26 15:52:30 +0300771 INIT_LIST_HEAD(&port->list);
Andreas Noevera25c8b22014-06-03 22:04:02 +0200772 return 0;
773
774}
775
Mika Westerberg0b2863a2017-02-19 16:57:27 +0200776static int tb_port_alloc_hopid(struct tb_port *port, bool in, int min_hopid,
777 int max_hopid)
778{
779 int port_max_hopid;
780 struct ida *ida;
781
782 if (in) {
783 port_max_hopid = port->config.max_in_hop_id;
784 ida = &port->in_hopids;
785 } else {
786 port_max_hopid = port->config.max_out_hop_id;
787 ida = &port->out_hopids;
788 }
789
Mika Westerberg12676422020-06-01 12:47:07 +0300790 /*
791 * NHI can use HopIDs 1-max for other adapters HopIDs 0-7 are
792 * reserved.
793 */
Mika Westerberga3cfebd2020-07-25 10:32:46 +0300794 if (!tb_port_is_nhi(port) && min_hopid < TB_PATH_MIN_HOPID)
Mika Westerberg0b2863a2017-02-19 16:57:27 +0200795 min_hopid = TB_PATH_MIN_HOPID;
796
797 if (max_hopid < 0 || max_hopid > port_max_hopid)
798 max_hopid = port_max_hopid;
799
800 return ida_simple_get(ida, min_hopid, max_hopid + 1, GFP_KERNEL);
801}
802
803/**
804 * tb_port_alloc_in_hopid() - Allocate input HopID from port
805 * @port: Port to allocate HopID for
806 * @min_hopid: Minimum acceptable input HopID
807 * @max_hopid: Maximum acceptable input HopID
808 *
809 * Return: HopID between @min_hopid and @max_hopid or negative errno in
810 * case of error.
811 */
812int tb_port_alloc_in_hopid(struct tb_port *port, int min_hopid, int max_hopid)
813{
814 return tb_port_alloc_hopid(port, true, min_hopid, max_hopid);
815}
816
817/**
818 * tb_port_alloc_out_hopid() - Allocate output HopID from port
819 * @port: Port to allocate HopID for
820 * @min_hopid: Minimum acceptable output HopID
821 * @max_hopid: Maximum acceptable output HopID
822 *
823 * Return: HopID between @min_hopid and @max_hopid or negative errno in
824 * case of error.
825 */
826int tb_port_alloc_out_hopid(struct tb_port *port, int min_hopid, int max_hopid)
827{
828 return tb_port_alloc_hopid(port, false, min_hopid, max_hopid);
829}
830
831/**
832 * tb_port_release_in_hopid() - Release allocated input HopID from port
833 * @port: Port whose HopID to release
834 * @hopid: HopID to release
835 */
836void tb_port_release_in_hopid(struct tb_port *port, int hopid)
837{
838 ida_simple_remove(&port->in_hopids, hopid);
839}
840
841/**
842 * tb_port_release_out_hopid() - Release allocated output HopID from port
843 * @port: Port whose HopID to release
844 * @hopid: HopID to release
845 */
846void tb_port_release_out_hopid(struct tb_port *port, int hopid)
847{
848 ida_simple_remove(&port->out_hopids, hopid);
849}
850
Mika Westerberg69eb79f2020-04-29 17:00:30 +0300851static inline bool tb_switch_is_reachable(const struct tb_switch *parent,
852 const struct tb_switch *sw)
853{
854 u64 mask = (1ULL << parent->config.depth * 8) - 1;
855 return (tb_route(parent) & mask) == (tb_route(sw) & mask);
856}
857
Mika Westerberg93f36ad2017-02-19 13:48:29 +0200858/**
Mika Westerbergfb19fac2017-02-19 21:51:30 +0200859 * tb_next_port_on_path() - Return next port for given port on a path
860 * @start: Start port of the walk
861 * @end: End port of the walk
862 * @prev: Previous port (%NULL if this is the first)
863 *
864 * This function can be used to walk from one port to another if they
865 * are connected through zero or more switches. If the @prev is dual
866 * link port, the function follows that link and returns another end on
867 * that same link.
868 *
869 * If the @end port has been reached, return %NULL.
870 *
871 * Domain tb->lock must be held when this function is called.
872 */
873struct tb_port *tb_next_port_on_path(struct tb_port *start, struct tb_port *end,
874 struct tb_port *prev)
875{
876 struct tb_port *next;
877
878 if (!prev)
879 return start;
880
881 if (prev->sw == end->sw) {
882 if (prev == end)
883 return NULL;
884 return end;
885 }
886
Mika Westerberg69eb79f2020-04-29 17:00:30 +0300887 if (tb_switch_is_reachable(prev->sw, end->sw)) {
888 next = tb_port_at(tb_route(end->sw), prev->sw);
889 /* Walk down the topology if next == prev */
Mika Westerbergfb19fac2017-02-19 21:51:30 +0200890 if (prev->remote &&
Mika Westerberg69eb79f2020-04-29 17:00:30 +0300891 (next == prev || next->dual_link_port == prev))
Mika Westerbergfb19fac2017-02-19 21:51:30 +0200892 next = prev->remote;
Mika Westerbergfb19fac2017-02-19 21:51:30 +0200893 } else {
894 if (tb_is_upstream_port(prev)) {
895 next = prev->remote;
896 } else {
897 next = tb_upstream_port(prev->sw);
898 /*
899 * Keep the same link if prev and next are both
900 * dual link ports.
901 */
902 if (next->dual_link_port &&
903 next->link_nr != prev->link_nr) {
904 next = next->dual_link_port;
905 }
906 }
907 }
908
Mika Westerberg69eb79f2020-04-29 17:00:30 +0300909 return next != prev ? next : NULL;
Mika Westerbergfb19fac2017-02-19 21:51:30 +0200910}
911
Mika Westerberg5b7b8c02020-05-08 12:41:34 +0300912/**
913 * tb_port_get_link_speed() - Get current link speed
914 * @port: Port to check (USB4 or CIO)
915 *
916 * Returns link speed in Gb/s or negative errno in case of failure.
917 */
918int tb_port_get_link_speed(struct tb_port *port)
Mika Westerberg91c0c122019-03-21 19:03:00 +0200919{
920 u32 val, speed;
921 int ret;
922
923 if (!port->cap_phy)
924 return -EINVAL;
925
926 ret = tb_port_read(port, &val, TB_CFG_PORT,
927 port->cap_phy + LANE_ADP_CS_1, 1);
928 if (ret)
929 return ret;
930
931 speed = (val & LANE_ADP_CS_1_CURRENT_SPEED_MASK) >>
932 LANE_ADP_CS_1_CURRENT_SPEED_SHIFT;
933 return speed == LANE_ADP_CS_1_CURRENT_SPEED_GEN3 ? 20 : 10;
934}
935
Isaac Hazan4210d502020-09-24 11:43:58 +0300936/**
937 * tb_port_get_link_width() - Get current link width
938 * @port: Port to check (USB4 or CIO)
939 *
940 * Returns link width. Return values can be 1 (Single-Lane), 2 (Dual-Lane)
941 * or negative errno in case of failure.
942 */
943int tb_port_get_link_width(struct tb_port *port)
Mika Westerberg91c0c122019-03-21 19:03:00 +0200944{
945 u32 val;
946 int ret;
947
948 if (!port->cap_phy)
949 return -EINVAL;
950
951 ret = tb_port_read(port, &val, TB_CFG_PORT,
952 port->cap_phy + LANE_ADP_CS_1, 1);
953 if (ret)
954 return ret;
955
956 return (val & LANE_ADP_CS_1_CURRENT_WIDTH_MASK) >>
957 LANE_ADP_CS_1_CURRENT_WIDTH_SHIFT;
958}
959
960static bool tb_port_is_width_supported(struct tb_port *port, int width)
961{
962 u32 phy, widths;
963 int ret;
964
965 if (!port->cap_phy)
966 return false;
967
968 ret = tb_port_read(port, &phy, TB_CFG_PORT,
969 port->cap_phy + LANE_ADP_CS_0, 1);
970 if (ret)
Dan Carpentere9d0e752020-03-03 13:17:16 +0300971 return false;
Mika Westerberg91c0c122019-03-21 19:03:00 +0200972
973 widths = (phy & LANE_ADP_CS_0_SUPPORTED_WIDTH_MASK) >>
974 LANE_ADP_CS_0_SUPPORTED_WIDTH_SHIFT;
975
976 return !!(widths & width);
977}
978
979static int tb_port_set_link_width(struct tb_port *port, unsigned int width)
980{
981 u32 val;
982 int ret;
983
984 if (!port->cap_phy)
985 return -EINVAL;
986
987 ret = tb_port_read(port, &val, TB_CFG_PORT,
988 port->cap_phy + LANE_ADP_CS_1, 1);
989 if (ret)
990 return ret;
991
992 val &= ~LANE_ADP_CS_1_TARGET_WIDTH_MASK;
993 switch (width) {
994 case 1:
995 val |= LANE_ADP_CS_1_TARGET_WIDTH_SINGLE <<
996 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
997 break;
998 case 2:
999 val |= LANE_ADP_CS_1_TARGET_WIDTH_DUAL <<
1000 LANE_ADP_CS_1_TARGET_WIDTH_SHIFT;
1001 break;
1002 default:
1003 return -EINVAL;
1004 }
1005
1006 val |= LANE_ADP_CS_1_LB;
1007
1008 return tb_port_write(port, &val, TB_CFG_PORT,
1009 port->cap_phy + LANE_ADP_CS_1, 1);
1010}
1011
Isaac Hazan5cc0df92020-09-24 11:44:01 +03001012/**
1013 * tb_port_lane_bonding_enable() - Enable bonding on port
1014 * @port: port to enable
1015 *
1016 * Enable bonding by setting the link width of the port and the
1017 * other port in case of dual link port.
1018 *
1019 * Return: %0 in case of success and negative errno in case of error
1020 */
1021int tb_port_lane_bonding_enable(struct tb_port *port)
Mika Westerberg91c0c122019-03-21 19:03:00 +02001022{
1023 int ret;
1024
1025 /*
1026 * Enable lane bonding for both links if not already enabled by
1027 * for example the boot firmware.
1028 */
1029 ret = tb_port_get_link_width(port);
1030 if (ret == 1) {
1031 ret = tb_port_set_link_width(port, 2);
1032 if (ret)
1033 return ret;
1034 }
1035
1036 ret = tb_port_get_link_width(port->dual_link_port);
1037 if (ret == 1) {
1038 ret = tb_port_set_link_width(port->dual_link_port, 2);
1039 if (ret) {
1040 tb_port_set_link_width(port, 1);
1041 return ret;
1042 }
1043 }
1044
1045 port->bonded = true;
1046 port->dual_link_port->bonded = true;
1047
1048 return 0;
1049}
1050
Isaac Hazan5cc0df92020-09-24 11:44:01 +03001051/**
1052 * tb_port_lane_bonding_disable() - Disable bonding on port
1053 * @port: port to disable
1054 *
1055 * Disable bonding by setting the link width of the port and the
1056 * other port in case of dual link port.
1057 *
1058 */
1059void tb_port_lane_bonding_disable(struct tb_port *port)
Mika Westerberg91c0c122019-03-21 19:03:00 +02001060{
1061 port->dual_link_port->bonded = false;
1062 port->bonded = false;
1063
1064 tb_port_set_link_width(port->dual_link_port, 1);
1065 tb_port_set_link_width(port, 1);
1066}
1067
Mika Westerbergfb19fac2017-02-19 21:51:30 +02001068/**
Mika Westerberge78db6f2017-10-12 16:45:50 +03001069 * tb_port_is_enabled() - Is the adapter port enabled
1070 * @port: Port to check
1071 */
1072bool tb_port_is_enabled(struct tb_port *port)
1073{
1074 switch (port->config.type) {
1075 case TB_TYPE_PCIE_UP:
1076 case TB_TYPE_PCIE_DOWN:
1077 return tb_pci_port_is_enabled(port);
1078
Mika Westerberg4f807e42018-09-17 16:30:49 +03001079 case TB_TYPE_DP_HDMI_IN:
1080 case TB_TYPE_DP_HDMI_OUT:
1081 return tb_dp_port_is_enabled(port);
1082
Rajmohan Manie6f81852019-12-17 15:33:44 +03001083 case TB_TYPE_USB3_UP:
1084 case TB_TYPE_USB3_DOWN:
1085 return tb_usb3_port_is_enabled(port);
1086
Mika Westerberge78db6f2017-10-12 16:45:50 +03001087 default:
1088 return false;
1089 }
1090}
1091
1092/**
Rajmohan Manie6f81852019-12-17 15:33:44 +03001093 * tb_usb3_port_is_enabled() - Is the USB3 adapter port enabled
1094 * @port: USB3 adapter port to check
1095 */
1096bool tb_usb3_port_is_enabled(struct tb_port *port)
1097{
1098 u32 data;
1099
1100 if (tb_port_read(port, &data, TB_CFG_PORT,
1101 port->cap_adap + ADP_USB3_CS_0, 1))
1102 return false;
1103
1104 return !!(data & ADP_USB3_CS_0_PE);
1105}
1106
1107/**
1108 * tb_usb3_port_enable() - Enable USB3 adapter port
1109 * @port: USB3 adapter port to enable
1110 * @enable: Enable/disable the USB3 adapter
1111 */
1112int tb_usb3_port_enable(struct tb_port *port, bool enable)
1113{
1114 u32 word = enable ? (ADP_USB3_CS_0_PE | ADP_USB3_CS_0_V)
1115 : ADP_USB3_CS_0_V;
1116
1117 if (!port->cap_adap)
1118 return -ENXIO;
1119 return tb_port_write(port, &word, TB_CFG_PORT,
1120 port->cap_adap + ADP_USB3_CS_0, 1);
1121}
1122
1123/**
Mika Westerberg0414bec2017-02-19 23:43:26 +02001124 * tb_pci_port_is_enabled() - Is the PCIe adapter port enabled
1125 * @port: PCIe port to check
1126 */
1127bool tb_pci_port_is_enabled(struct tb_port *port)
1128{
1129 u32 data;
1130
Mika Westerberg778bfca2019-09-06 12:05:24 +03001131 if (tb_port_read(port, &data, TB_CFG_PORT,
1132 port->cap_adap + ADP_PCIE_CS_0, 1))
Mika Westerberg0414bec2017-02-19 23:43:26 +02001133 return false;
1134
Mika Westerberg778bfca2019-09-06 12:05:24 +03001135 return !!(data & ADP_PCIE_CS_0_PE);
Mika Westerberg0414bec2017-02-19 23:43:26 +02001136}
1137
1138/**
Mika Westerberg93f36ad2017-02-19 13:48:29 +02001139 * tb_pci_port_enable() - Enable PCIe adapter port
1140 * @port: PCIe port to enable
1141 * @enable: Enable/disable the PCIe adapter
1142 */
1143int tb_pci_port_enable(struct tb_port *port, bool enable)
1144{
Mika Westerberg778bfca2019-09-06 12:05:24 +03001145 u32 word = enable ? ADP_PCIE_CS_0_PE : 0x0;
Mika Westerberg93f36ad2017-02-19 13:48:29 +02001146 if (!port->cap_adap)
1147 return -ENXIO;
Mika Westerberg778bfca2019-09-06 12:05:24 +03001148 return tb_port_write(port, &word, TB_CFG_PORT,
1149 port->cap_adap + ADP_PCIE_CS_0, 1);
Mika Westerberg93f36ad2017-02-19 13:48:29 +02001150}
1151
Mika Westerberg4f807e42018-09-17 16:30:49 +03001152/**
1153 * tb_dp_port_hpd_is_active() - Is HPD already active
1154 * @port: DP out port to check
1155 *
1156 * Checks if the DP OUT adapter port has HDP bit already set.
1157 */
1158int tb_dp_port_hpd_is_active(struct tb_port *port)
1159{
1160 u32 data;
1161 int ret;
1162
Mika Westerberg98176382019-09-06 11:32:15 +03001163 ret = tb_port_read(port, &data, TB_CFG_PORT,
1164 port->cap_adap + ADP_DP_CS_2, 1);
Mika Westerberg4f807e42018-09-17 16:30:49 +03001165 if (ret)
1166 return ret;
1167
Mika Westerberg98176382019-09-06 11:32:15 +03001168 return !!(data & ADP_DP_CS_2_HDP);
Mika Westerberg4f807e42018-09-17 16:30:49 +03001169}
1170
1171/**
1172 * tb_dp_port_hpd_clear() - Clear HPD from DP IN port
1173 * @port: Port to clear HPD
1174 *
1175 * If the DP IN port has HDP set, this function can be used to clear it.
1176 */
1177int tb_dp_port_hpd_clear(struct tb_port *port)
1178{
1179 u32 data;
1180 int ret;
1181
Mika Westerberg98176382019-09-06 11:32:15 +03001182 ret = tb_port_read(port, &data, TB_CFG_PORT,
1183 port->cap_adap + ADP_DP_CS_3, 1);
Mika Westerberg4f807e42018-09-17 16:30:49 +03001184 if (ret)
1185 return ret;
1186
Mika Westerberg98176382019-09-06 11:32:15 +03001187 data |= ADP_DP_CS_3_HDPC;
1188 return tb_port_write(port, &data, TB_CFG_PORT,
1189 port->cap_adap + ADP_DP_CS_3, 1);
Mika Westerberg4f807e42018-09-17 16:30:49 +03001190}
1191
1192/**
1193 * tb_dp_port_set_hops() - Set video/aux Hop IDs for DP port
1194 * @port: DP IN/OUT port to set hops
1195 * @video: Video Hop ID
1196 * @aux_tx: AUX TX Hop ID
1197 * @aux_rx: AUX RX Hop ID
1198 *
1199 * Programs specified Hop IDs for DP IN/OUT port.
1200 */
1201int tb_dp_port_set_hops(struct tb_port *port, unsigned int video,
1202 unsigned int aux_tx, unsigned int aux_rx)
1203{
1204 u32 data[2];
1205 int ret;
1206
Mika Westerberg98176382019-09-06 11:32:15 +03001207 ret = tb_port_read(port, data, TB_CFG_PORT,
1208 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
Mika Westerberg4f807e42018-09-17 16:30:49 +03001209 if (ret)
1210 return ret;
1211
Mika Westerberg98176382019-09-06 11:32:15 +03001212 data[0] &= ~ADP_DP_CS_0_VIDEO_HOPID_MASK;
1213 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
1214 data[1] &= ~ADP_DP_CS_1_AUX_RX_HOPID_MASK;
Mika Westerberg4f807e42018-09-17 16:30:49 +03001215
Mika Westerberg98176382019-09-06 11:32:15 +03001216 data[0] |= (video << ADP_DP_CS_0_VIDEO_HOPID_SHIFT) &
1217 ADP_DP_CS_0_VIDEO_HOPID_MASK;
1218 data[1] |= aux_tx & ADP_DP_CS_1_AUX_TX_HOPID_MASK;
1219 data[1] |= (aux_rx << ADP_DP_CS_1_AUX_RX_HOPID_SHIFT) &
1220 ADP_DP_CS_1_AUX_RX_HOPID_MASK;
Mika Westerberg4f807e42018-09-17 16:30:49 +03001221
Mika Westerberg98176382019-09-06 11:32:15 +03001222 return tb_port_write(port, data, TB_CFG_PORT,
1223 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
Mika Westerberg4f807e42018-09-17 16:30:49 +03001224}
1225
1226/**
1227 * tb_dp_port_is_enabled() - Is DP adapter port enabled
1228 * @port: DP adapter port to check
1229 */
1230bool tb_dp_port_is_enabled(struct tb_port *port)
1231{
Mika Westerbergfd5c46b2019-09-19 14:55:23 +03001232 u32 data[2];
Mika Westerberg4f807e42018-09-17 16:30:49 +03001233
Mika Westerberg98176382019-09-06 11:32:15 +03001234 if (tb_port_read(port, data, TB_CFG_PORT, port->cap_adap + ADP_DP_CS_0,
Mika Westerbergfd5c46b2019-09-19 14:55:23 +03001235 ARRAY_SIZE(data)))
Mika Westerberg4f807e42018-09-17 16:30:49 +03001236 return false;
1237
Mika Westerberg98176382019-09-06 11:32:15 +03001238 return !!(data[0] & (ADP_DP_CS_0_VE | ADP_DP_CS_0_AE));
Mika Westerberg4f807e42018-09-17 16:30:49 +03001239}
1240
1241/**
1242 * tb_dp_port_enable() - Enables/disables DP paths of a port
1243 * @port: DP IN/OUT port
1244 * @enable: Enable/disable DP path
1245 *
1246 * Once Hop IDs are programmed DP paths can be enabled or disabled by
1247 * calling this function.
1248 */
1249int tb_dp_port_enable(struct tb_port *port, bool enable)
1250{
Mika Westerbergfd5c46b2019-09-19 14:55:23 +03001251 u32 data[2];
Mika Westerberg4f807e42018-09-17 16:30:49 +03001252 int ret;
1253
Mika Westerberg98176382019-09-06 11:32:15 +03001254 ret = tb_port_read(port, data, TB_CFG_PORT,
1255 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
Mika Westerberg4f807e42018-09-17 16:30:49 +03001256 if (ret)
1257 return ret;
1258
1259 if (enable)
Mika Westerberg98176382019-09-06 11:32:15 +03001260 data[0] |= ADP_DP_CS_0_VE | ADP_DP_CS_0_AE;
Mika Westerberg4f807e42018-09-17 16:30:49 +03001261 else
Mika Westerberg98176382019-09-06 11:32:15 +03001262 data[0] &= ~(ADP_DP_CS_0_VE | ADP_DP_CS_0_AE);
Mika Westerberg4f807e42018-09-17 16:30:49 +03001263
Mika Westerberg98176382019-09-06 11:32:15 +03001264 return tb_port_write(port, data, TB_CFG_PORT,
1265 port->cap_adap + ADP_DP_CS_0, ARRAY_SIZE(data));
Mika Westerberg4f807e42018-09-17 16:30:49 +03001266}
1267
Andreas Noevera25c8b22014-06-03 22:04:02 +02001268/* switch utility functions */
1269
Mika Westerbergb0407982019-12-17 15:33:40 +03001270static const char *tb_switch_generation_name(const struct tb_switch *sw)
Andreas Noevera25c8b22014-06-03 22:04:02 +02001271{
Mika Westerbergb0407982019-12-17 15:33:40 +03001272 switch (sw->generation) {
1273 case 1:
1274 return "Thunderbolt 1";
1275 case 2:
1276 return "Thunderbolt 2";
1277 case 3:
1278 return "Thunderbolt 3";
1279 case 4:
1280 return "USB4";
1281 default:
1282 return "Unknown";
1283 }
1284}
1285
1286static void tb_dump_switch(const struct tb *tb, const struct tb_switch *sw)
1287{
1288 const struct tb_regs_switch_header *regs = &sw->config;
1289
1290 tb_dbg(tb, " %s Switch: %x:%x (Revision: %d, TB Version: %d)\n",
1291 tb_switch_generation_name(sw), regs->vendor_id, regs->device_id,
1292 regs->revision, regs->thunderbolt_version);
1293 tb_dbg(tb, " Max Port Number: %d\n", regs->max_port_number);
Mika Westerbergdaa51402018-10-01 12:31:19 +03001294 tb_dbg(tb, " Config:\n");
1295 tb_dbg(tb,
Andreas Noevera25c8b22014-06-03 22:04:02 +02001296 " Upstream Port Number: %d Depth: %d Route String: %#llx Enabled: %d, PlugEventsDelay: %dms\n",
Mika Westerbergb0407982019-12-17 15:33:40 +03001297 regs->upstream_port_number, regs->depth,
1298 (((u64) regs->route_hi) << 32) | regs->route_lo,
1299 regs->enabled, regs->plug_events_delay);
Mika Westerbergdaa51402018-10-01 12:31:19 +03001300 tb_dbg(tb, " unknown1: %#x unknown4: %#x\n",
Mika Westerbergb0407982019-12-17 15:33:40 +03001301 regs->__unknown1, regs->__unknown4);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001302}
1303
Andreas Noever23dd5bb2014-06-03 22:04:12 +02001304/**
1305 * reset_switch() - reconfigure route, enable and send TB_CFG_PKG_RESET
Mika Westerberg356b6c42019-09-19 15:25:30 +03001306 * @sw: Switch to reset
Andreas Noever23dd5bb2014-06-03 22:04:12 +02001307 *
1308 * Return: Returns 0 on success or an error code on failure.
1309 */
Mika Westerberg356b6c42019-09-19 15:25:30 +03001310int tb_switch_reset(struct tb_switch *sw)
Andreas Noever23dd5bb2014-06-03 22:04:12 +02001311{
1312 struct tb_cfg_result res;
Mika Westerberg356b6c42019-09-19 15:25:30 +03001313
1314 if (sw->generation > 1)
1315 return 0;
1316
1317 tb_sw_dbg(sw, "resetting switch\n");
1318
1319 res.err = tb_sw_write(sw, ((u32 *) &sw->config) + 2,
1320 TB_CFG_SWITCH, 2, 2);
Andreas Noever23dd5bb2014-06-03 22:04:12 +02001321 if (res.err)
1322 return res.err;
Mika Westerberg356b6c42019-09-19 15:25:30 +03001323 res = tb_cfg_reset(sw->tb->ctl, tb_route(sw), TB_CFG_DEFAULT_TIMEOUT);
Andreas Noever23dd5bb2014-06-03 22:04:12 +02001324 if (res.err > 0)
1325 return -EIO;
1326 return res.err;
1327}
1328
Andreas Noevera25c8b22014-06-03 22:04:02 +02001329/**
Andreas Noeverca389f72014-06-03 22:04:04 +02001330 * tb_plug_events_active() - enable/disable plug events on a switch
1331 *
1332 * Also configures a sane plug_events_delay of 255ms.
1333 *
1334 * Return: Returns 0 on success or an error code on failure.
1335 */
1336static int tb_plug_events_active(struct tb_switch *sw, bool active)
1337{
1338 u32 data;
1339 int res;
1340
Mika Westerberg5cb6ed312020-04-02 12:24:48 +03001341 if (tb_switch_is_icm(sw) || tb_switch_is_usb4(sw))
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001342 return 0;
1343
Andreas Noeverca389f72014-06-03 22:04:04 +02001344 sw->config.plug_events_delay = 0xff;
1345 res = tb_sw_write(sw, ((u32 *) &sw->config) + 4, TB_CFG_SWITCH, 4, 1);
1346 if (res)
1347 return res;
1348
1349 res = tb_sw_read(sw, &data, TB_CFG_SWITCH, sw->cap_plug_events + 1, 1);
1350 if (res)
1351 return res;
1352
1353 if (active) {
1354 data = data & 0xFFFFFF83;
1355 switch (sw->config.device_id) {
Lukas Wunner1d111402016-03-20 13:57:20 +01001356 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1357 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1358 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
Andreas Noeverca389f72014-06-03 22:04:04 +02001359 break;
1360 default:
1361 data |= 4;
1362 }
1363 } else {
1364 data = data | 0x7c;
1365 }
1366 return tb_sw_write(sw, &data, TB_CFG_SWITCH,
1367 sw->cap_plug_events + 1, 1);
1368}
1369
Mika Westerbergf67cf492017-06-06 15:25:16 +03001370static ssize_t authorized_show(struct device *dev,
1371 struct device_attribute *attr,
1372 char *buf)
1373{
1374 struct tb_switch *sw = tb_to_switch(dev);
1375
1376 return sprintf(buf, "%u\n", sw->authorized);
1377}
1378
1379static int tb_switch_set_authorized(struct tb_switch *sw, unsigned int val)
1380{
1381 int ret = -EINVAL;
1382
Mika Westerberg09f11b62019-03-19 16:48:41 +02001383 if (!mutex_trylock(&sw->tb->lock))
1384 return restart_syscall();
Mika Westerbergf67cf492017-06-06 15:25:16 +03001385
1386 if (sw->authorized)
1387 goto unlock;
1388
1389 switch (val) {
1390 /* Approve switch */
1391 case 1:
1392 if (sw->key)
1393 ret = tb_domain_approve_switch_key(sw->tb, sw);
1394 else
1395 ret = tb_domain_approve_switch(sw->tb, sw);
1396 break;
1397
1398 /* Challenge switch */
1399 case 2:
1400 if (sw->key)
1401 ret = tb_domain_challenge_switch_key(sw->tb, sw);
1402 break;
1403
1404 default:
1405 break;
1406 }
1407
1408 if (!ret) {
1409 sw->authorized = val;
1410 /* Notify status change to the userspace */
1411 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
1412 }
1413
1414unlock:
Mika Westerberg09f11b62019-03-19 16:48:41 +02001415 mutex_unlock(&sw->tb->lock);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001416 return ret;
1417}
1418
1419static ssize_t authorized_store(struct device *dev,
1420 struct device_attribute *attr,
1421 const char *buf, size_t count)
1422{
1423 struct tb_switch *sw = tb_to_switch(dev);
1424 unsigned int val;
1425 ssize_t ret;
1426
1427 ret = kstrtouint(buf, 0, &val);
1428 if (ret)
1429 return ret;
1430 if (val > 2)
1431 return -EINVAL;
1432
Mika Westerberg4f7c2e02019-05-28 18:56:20 +03001433 pm_runtime_get_sync(&sw->dev);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001434 ret = tb_switch_set_authorized(sw, val);
Mika Westerberg4f7c2e02019-05-28 18:56:20 +03001435 pm_runtime_mark_last_busy(&sw->dev);
1436 pm_runtime_put_autosuspend(&sw->dev);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001437
1438 return ret ? ret : count;
1439}
1440static DEVICE_ATTR_RW(authorized);
1441
Yehezkel Bernat14862ee2018-01-22 12:50:09 +02001442static ssize_t boot_show(struct device *dev, struct device_attribute *attr,
1443 char *buf)
1444{
1445 struct tb_switch *sw = tb_to_switch(dev);
1446
1447 return sprintf(buf, "%u\n", sw->boot);
1448}
1449static DEVICE_ATTR_RO(boot);
1450
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001451static ssize_t device_show(struct device *dev, struct device_attribute *attr,
1452 char *buf)
Andreas Noevera25c8b22014-06-03 22:04:02 +02001453{
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001454 struct tb_switch *sw = tb_to_switch(dev);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001455
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001456 return sprintf(buf, "%#x\n", sw->device);
1457}
1458static DEVICE_ATTR_RO(device);
Andreas Noeverca389f72014-06-03 22:04:04 +02001459
Mika Westerberg72ee3392017-06-06 15:25:05 +03001460static ssize_t
1461device_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1462{
1463 struct tb_switch *sw = tb_to_switch(dev);
1464
1465 return sprintf(buf, "%s\n", sw->device_name ? sw->device_name : "");
1466}
1467static DEVICE_ATTR_RO(device_name);
1468
Christian Kellnerb4063572019-10-03 19:32:40 +02001469static ssize_t
1470generation_show(struct device *dev, struct device_attribute *attr, char *buf)
1471{
1472 struct tb_switch *sw = tb_to_switch(dev);
1473
1474 return sprintf(buf, "%u\n", sw->generation);
1475}
1476static DEVICE_ATTR_RO(generation);
1477
Mika Westerbergf67cf492017-06-06 15:25:16 +03001478static ssize_t key_show(struct device *dev, struct device_attribute *attr,
1479 char *buf)
1480{
1481 struct tb_switch *sw = tb_to_switch(dev);
1482 ssize_t ret;
1483
Mika Westerberg09f11b62019-03-19 16:48:41 +02001484 if (!mutex_trylock(&sw->tb->lock))
1485 return restart_syscall();
Mika Westerbergf67cf492017-06-06 15:25:16 +03001486
1487 if (sw->key)
1488 ret = sprintf(buf, "%*phN\n", TB_SWITCH_KEY_SIZE, sw->key);
1489 else
1490 ret = sprintf(buf, "\n");
1491
Mika Westerberg09f11b62019-03-19 16:48:41 +02001492 mutex_unlock(&sw->tb->lock);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001493 return ret;
1494}
1495
1496static ssize_t key_store(struct device *dev, struct device_attribute *attr,
1497 const char *buf, size_t count)
1498{
1499 struct tb_switch *sw = tb_to_switch(dev);
1500 u8 key[TB_SWITCH_KEY_SIZE];
1501 ssize_t ret = count;
Bernat, Yehezkele545f0d2017-08-15 08:19:20 +03001502 bool clear = false;
Mika Westerbergf67cf492017-06-06 15:25:16 +03001503
Bernat, Yehezkele545f0d2017-08-15 08:19:20 +03001504 if (!strcmp(buf, "\n"))
1505 clear = true;
1506 else if (hex2bin(key, buf, sizeof(key)))
Mika Westerbergf67cf492017-06-06 15:25:16 +03001507 return -EINVAL;
1508
Mika Westerberg09f11b62019-03-19 16:48:41 +02001509 if (!mutex_trylock(&sw->tb->lock))
1510 return restart_syscall();
Mika Westerbergf67cf492017-06-06 15:25:16 +03001511
1512 if (sw->authorized) {
1513 ret = -EBUSY;
1514 } else {
1515 kfree(sw->key);
Bernat, Yehezkele545f0d2017-08-15 08:19:20 +03001516 if (clear) {
1517 sw->key = NULL;
1518 } else {
1519 sw->key = kmemdup(key, sizeof(key), GFP_KERNEL);
1520 if (!sw->key)
1521 ret = -ENOMEM;
1522 }
Mika Westerbergf67cf492017-06-06 15:25:16 +03001523 }
1524
Mika Westerberg09f11b62019-03-19 16:48:41 +02001525 mutex_unlock(&sw->tb->lock);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001526 return ret;
1527}
Bernat, Yehezkel0956e412017-08-15 08:19:12 +03001528static DEVICE_ATTR(key, 0600, key_show, key_store);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001529
Mika Westerberg91c0c122019-03-21 19:03:00 +02001530static ssize_t speed_show(struct device *dev, struct device_attribute *attr,
1531 char *buf)
1532{
1533 struct tb_switch *sw = tb_to_switch(dev);
1534
1535 return sprintf(buf, "%u.0 Gb/s\n", sw->link_speed);
1536}
1537
1538/*
1539 * Currently all lanes must run at the same speed but we expose here
1540 * both directions to allow possible asymmetric links in the future.
1541 */
1542static DEVICE_ATTR(rx_speed, 0444, speed_show, NULL);
1543static DEVICE_ATTR(tx_speed, 0444, speed_show, NULL);
1544
1545static ssize_t lanes_show(struct device *dev, struct device_attribute *attr,
1546 char *buf)
1547{
1548 struct tb_switch *sw = tb_to_switch(dev);
1549
1550 return sprintf(buf, "%u\n", sw->link_width);
1551}
1552
1553/*
1554 * Currently link has same amount of lanes both directions (1 or 2) but
1555 * expose them separately to allow possible asymmetric links in the future.
1556 */
1557static DEVICE_ATTR(rx_lanes, 0444, lanes_show, NULL);
1558static DEVICE_ATTR(tx_lanes, 0444, lanes_show, NULL);
1559
Mika Westerberge6b245c2017-06-06 15:25:17 +03001560static ssize_t nvm_authenticate_show(struct device *dev,
1561 struct device_attribute *attr, char *buf)
1562{
1563 struct tb_switch *sw = tb_to_switch(dev);
1564 u32 status;
1565
1566 nvm_get_auth_status(sw, &status);
1567 return sprintf(buf, "%#x\n", status);
1568}
1569
Mario Limonciello1cb36292020-06-23 11:14:29 -05001570static ssize_t nvm_authenticate_sysfs(struct device *dev, const char *buf,
1571 bool disconnect)
Mika Westerberge6b245c2017-06-06 15:25:17 +03001572{
1573 struct tb_switch *sw = tb_to_switch(dev);
Mario Limonciello4b794f82020-06-23 11:14:28 -05001574 int val;
Mika Westerberge6b245c2017-06-06 15:25:17 +03001575 int ret;
1576
Mika Westerberg4f7c2e02019-05-28 18:56:20 +03001577 pm_runtime_get_sync(&sw->dev);
1578
1579 if (!mutex_trylock(&sw->tb->lock)) {
1580 ret = restart_syscall();
1581 goto exit_rpm;
1582 }
Mika Westerberge6b245c2017-06-06 15:25:17 +03001583
1584 /* If NVMem devices are not yet added */
1585 if (!sw->nvm) {
1586 ret = -EAGAIN;
1587 goto exit_unlock;
1588 }
1589
Mario Limonciello4b794f82020-06-23 11:14:28 -05001590 ret = kstrtoint(buf, 10, &val);
Mika Westerberge6b245c2017-06-06 15:25:17 +03001591 if (ret)
1592 goto exit_unlock;
1593
1594 /* Always clear the authentication status */
1595 nvm_clear_auth_status(sw);
1596
Mario Limonciello4b794f82020-06-23 11:14:28 -05001597 if (val > 0) {
1598 if (!sw->nvm->flushed) {
1599 if (!sw->nvm->buf) {
1600 ret = -EINVAL;
1601 goto exit_unlock;
1602 }
1603
1604 ret = nvm_validate_and_write(sw);
1605 if (ret || val == WRITE_ONLY)
1606 goto exit_unlock;
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03001607 }
Mario Limonciello4b794f82020-06-23 11:14:28 -05001608 if (val == WRITE_AND_AUTHENTICATE) {
Mario Limonciello1cb36292020-06-23 11:14:29 -05001609 if (disconnect) {
1610 ret = tb_lc_force_power(sw);
1611 } else {
1612 sw->nvm->authenticating = true;
1613 ret = nvm_authenticate(sw);
1614 }
Mario Limonciello4b794f82020-06-23 11:14:28 -05001615 }
Mika Westerberge6b245c2017-06-06 15:25:17 +03001616 }
1617
1618exit_unlock:
Mika Westerberg09f11b62019-03-19 16:48:41 +02001619 mutex_unlock(&sw->tb->lock);
Mika Westerberg4f7c2e02019-05-28 18:56:20 +03001620exit_rpm:
1621 pm_runtime_mark_last_busy(&sw->dev);
1622 pm_runtime_put_autosuspend(&sw->dev);
Mika Westerberge6b245c2017-06-06 15:25:17 +03001623
Mario Limonciello1cb36292020-06-23 11:14:29 -05001624 return ret;
1625}
1626
1627static ssize_t nvm_authenticate_store(struct device *dev,
1628 struct device_attribute *attr, const char *buf, size_t count)
1629{
1630 int ret = nvm_authenticate_sysfs(dev, buf, false);
Mika Westerberge6b245c2017-06-06 15:25:17 +03001631 if (ret)
1632 return ret;
1633 return count;
1634}
1635static DEVICE_ATTR_RW(nvm_authenticate);
1636
Mario Limonciello1cb36292020-06-23 11:14:29 -05001637static ssize_t nvm_authenticate_on_disconnect_show(struct device *dev,
1638 struct device_attribute *attr, char *buf)
1639{
1640 return nvm_authenticate_show(dev, attr, buf);
1641}
1642
1643static ssize_t nvm_authenticate_on_disconnect_store(struct device *dev,
1644 struct device_attribute *attr, const char *buf, size_t count)
1645{
1646 int ret;
1647
1648 ret = nvm_authenticate_sysfs(dev, buf, true);
1649 return ret ? ret : count;
1650}
1651static DEVICE_ATTR_RW(nvm_authenticate_on_disconnect);
1652
Mika Westerberge6b245c2017-06-06 15:25:17 +03001653static ssize_t nvm_version_show(struct device *dev,
1654 struct device_attribute *attr, char *buf)
1655{
1656 struct tb_switch *sw = tb_to_switch(dev);
1657 int ret;
1658
Mika Westerberg09f11b62019-03-19 16:48:41 +02001659 if (!mutex_trylock(&sw->tb->lock))
1660 return restart_syscall();
Mika Westerberge6b245c2017-06-06 15:25:17 +03001661
1662 if (sw->safe_mode)
1663 ret = -ENODATA;
1664 else if (!sw->nvm)
1665 ret = -EAGAIN;
1666 else
1667 ret = sprintf(buf, "%x.%x\n", sw->nvm->major, sw->nvm->minor);
1668
Mika Westerberg09f11b62019-03-19 16:48:41 +02001669 mutex_unlock(&sw->tb->lock);
Mika Westerberge6b245c2017-06-06 15:25:17 +03001670
1671 return ret;
1672}
1673static DEVICE_ATTR_RO(nvm_version);
1674
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001675static ssize_t vendor_show(struct device *dev, struct device_attribute *attr,
1676 char *buf)
1677{
1678 struct tb_switch *sw = tb_to_switch(dev);
1679
1680 return sprintf(buf, "%#x\n", sw->vendor);
1681}
1682static DEVICE_ATTR_RO(vendor);
1683
Mika Westerberg72ee3392017-06-06 15:25:05 +03001684static ssize_t
1685vendor_name_show(struct device *dev, struct device_attribute *attr, char *buf)
1686{
1687 struct tb_switch *sw = tb_to_switch(dev);
1688
1689 return sprintf(buf, "%s\n", sw->vendor_name ? sw->vendor_name : "");
1690}
1691static DEVICE_ATTR_RO(vendor_name);
1692
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001693static ssize_t unique_id_show(struct device *dev, struct device_attribute *attr,
1694 char *buf)
1695{
1696 struct tb_switch *sw = tb_to_switch(dev);
1697
1698 return sprintf(buf, "%pUb\n", sw->uuid);
1699}
1700static DEVICE_ATTR_RO(unique_id);
1701
1702static struct attribute *switch_attrs[] = {
Mika Westerbergf67cf492017-06-06 15:25:16 +03001703 &dev_attr_authorized.attr,
Yehezkel Bernat14862ee2018-01-22 12:50:09 +02001704 &dev_attr_boot.attr,
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001705 &dev_attr_device.attr,
Mika Westerberg72ee3392017-06-06 15:25:05 +03001706 &dev_attr_device_name.attr,
Christian Kellnerb4063572019-10-03 19:32:40 +02001707 &dev_attr_generation.attr,
Mika Westerbergf67cf492017-06-06 15:25:16 +03001708 &dev_attr_key.attr,
Mika Westerberge6b245c2017-06-06 15:25:17 +03001709 &dev_attr_nvm_authenticate.attr,
Mario Limonciello1cb36292020-06-23 11:14:29 -05001710 &dev_attr_nvm_authenticate_on_disconnect.attr,
Mika Westerberge6b245c2017-06-06 15:25:17 +03001711 &dev_attr_nvm_version.attr,
Mika Westerberg91c0c122019-03-21 19:03:00 +02001712 &dev_attr_rx_speed.attr,
1713 &dev_attr_rx_lanes.attr,
1714 &dev_attr_tx_speed.attr,
1715 &dev_attr_tx_lanes.attr,
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001716 &dev_attr_vendor.attr,
Mika Westerberg72ee3392017-06-06 15:25:05 +03001717 &dev_attr_vendor_name.attr,
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001718 &dev_attr_unique_id.attr,
1719 NULL,
1720};
1721
Mika Westerbergf67cf492017-06-06 15:25:16 +03001722static umode_t switch_attr_is_visible(struct kobject *kobj,
1723 struct attribute *attr, int n)
1724{
Tian Taofff15f22020-09-01 16:27:17 +08001725 struct device *dev = kobj_to_dev(kobj);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001726 struct tb_switch *sw = tb_to_switch(dev);
1727
Mika Westerberg58f414f2018-09-11 15:34:23 +03001728 if (attr == &dev_attr_device.attr) {
1729 if (!sw->device)
1730 return 0;
1731 } else if (attr == &dev_attr_device_name.attr) {
1732 if (!sw->device_name)
1733 return 0;
1734 } else if (attr == &dev_attr_vendor.attr) {
1735 if (!sw->vendor)
1736 return 0;
1737 } else if (attr == &dev_attr_vendor_name.attr) {
1738 if (!sw->vendor_name)
1739 return 0;
1740 } else if (attr == &dev_attr_key.attr) {
Mika Westerbergf67cf492017-06-06 15:25:16 +03001741 if (tb_route(sw) &&
1742 sw->tb->security_level == TB_SECURITY_SECURE &&
1743 sw->security_level == TB_SECURITY_SECURE)
1744 return attr->mode;
1745 return 0;
Mika Westerberg91c0c122019-03-21 19:03:00 +02001746 } else if (attr == &dev_attr_rx_speed.attr ||
1747 attr == &dev_attr_rx_lanes.attr ||
1748 attr == &dev_attr_tx_speed.attr ||
1749 attr == &dev_attr_tx_lanes.attr) {
1750 if (tb_route(sw))
1751 return attr->mode;
1752 return 0;
Mika Westerberg3f415e52019-02-05 12:51:40 +03001753 } else if (attr == &dev_attr_nvm_authenticate.attr) {
Mika Westerbergb0407982019-12-17 15:33:40 +03001754 if (nvm_upgradeable(sw))
Mika Westerberg3f415e52019-02-05 12:51:40 +03001755 return attr->mode;
1756 return 0;
1757 } else if (attr == &dev_attr_nvm_version.attr) {
Mika Westerbergb0407982019-12-17 15:33:40 +03001758 if (nvm_readable(sw))
Mika Westerberge6b245c2017-06-06 15:25:17 +03001759 return attr->mode;
1760 return 0;
Yehezkel Bernat14862ee2018-01-22 12:50:09 +02001761 } else if (attr == &dev_attr_boot.attr) {
1762 if (tb_route(sw))
1763 return attr->mode;
1764 return 0;
Mario Limonciello1cb36292020-06-23 11:14:29 -05001765 } else if (attr == &dev_attr_nvm_authenticate_on_disconnect.attr) {
1766 if (sw->quirks & QUIRK_FORCE_POWER_LINK_CONTROLLER)
1767 return attr->mode;
1768 return 0;
Mika Westerbergf67cf492017-06-06 15:25:16 +03001769 }
1770
Mika Westerberge6b245c2017-06-06 15:25:17 +03001771 return sw->safe_mode ? 0 : attr->mode;
Mika Westerbergf67cf492017-06-06 15:25:16 +03001772}
1773
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001774static struct attribute_group switch_group = {
Mika Westerbergf67cf492017-06-06 15:25:16 +03001775 .is_visible = switch_attr_is_visible,
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001776 .attrs = switch_attrs,
1777};
1778
1779static const struct attribute_group *switch_groups[] = {
1780 &switch_group,
1781 NULL,
1782};
1783
1784static void tb_switch_release(struct device *dev)
1785{
1786 struct tb_switch *sw = tb_to_switch(dev);
Mika Westerbergb433d012019-09-30 14:07:22 +03001787 struct tb_port *port;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001788
Mika Westerberg3e136762017-06-06 15:25:14 +03001789 dma_port_free(sw->dma_port);
1790
Mika Westerbergb433d012019-09-30 14:07:22 +03001791 tb_switch_for_each_port(sw, port) {
1792 if (!port->disabled) {
1793 ida_destroy(&port->in_hopids);
1794 ida_destroy(&port->out_hopids);
Mika Westerberg0b2863a2017-02-19 16:57:27 +02001795 }
1796 }
1797
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001798 kfree(sw->uuid);
Mika Westerberg72ee3392017-06-06 15:25:05 +03001799 kfree(sw->device_name);
1800 kfree(sw->vendor_name);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001801 kfree(sw->ports);
Andreas Noever343fcb82014-06-12 23:11:47 +02001802 kfree(sw->drom);
Mika Westerbergf67cf492017-06-06 15:25:16 +03001803 kfree(sw->key);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001804 kfree(sw);
1805}
1806
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03001807/*
1808 * Currently only need to provide the callbacks. Everything else is handled
1809 * in the connection manager.
1810 */
1811static int __maybe_unused tb_switch_runtime_suspend(struct device *dev)
1812{
Mika Westerberg4f7c2e02019-05-28 18:56:20 +03001813 struct tb_switch *sw = tb_to_switch(dev);
1814 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1815
1816 if (cm_ops->runtime_suspend_switch)
1817 return cm_ops->runtime_suspend_switch(sw);
1818
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03001819 return 0;
1820}
1821
1822static int __maybe_unused tb_switch_runtime_resume(struct device *dev)
1823{
Mika Westerberg4f7c2e02019-05-28 18:56:20 +03001824 struct tb_switch *sw = tb_to_switch(dev);
1825 const struct tb_cm_ops *cm_ops = sw->tb->cm_ops;
1826
1827 if (cm_ops->runtime_resume_switch)
1828 return cm_ops->runtime_resume_switch(sw);
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03001829 return 0;
1830}
1831
1832static const struct dev_pm_ops tb_switch_pm_ops = {
1833 SET_RUNTIME_PM_OPS(tb_switch_runtime_suspend, tb_switch_runtime_resume,
1834 NULL)
1835};
1836
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001837struct device_type tb_switch_type = {
1838 .name = "thunderbolt_device",
1839 .release = tb_switch_release,
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03001840 .pm = &tb_switch_pm_ops,
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001841};
1842
Mika Westerberg2c3c4192017-06-06 15:25:13 +03001843static int tb_switch_get_generation(struct tb_switch *sw)
1844{
1845 switch (sw->config.device_id) {
1846 case PCI_DEVICE_ID_INTEL_LIGHT_RIDGE:
1847 case PCI_DEVICE_ID_INTEL_EAGLE_RIDGE:
1848 case PCI_DEVICE_ID_INTEL_LIGHT_PEAK:
1849 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_2C:
1850 case PCI_DEVICE_ID_INTEL_CACTUS_RIDGE_4C:
1851 case PCI_DEVICE_ID_INTEL_PORT_RIDGE:
1852 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_2C_BRIDGE:
1853 case PCI_DEVICE_ID_INTEL_REDWOOD_RIDGE_4C_BRIDGE:
1854 return 1;
1855
1856 case PCI_DEVICE_ID_INTEL_WIN_RIDGE_2C_BRIDGE:
1857 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_BRIDGE:
1858 case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_BRIDGE:
1859 return 2;
1860
1861 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE:
1862 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE:
1863 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE:
1864 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE:
1865 case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE:
Radion Mirchevsky4bac4712017-10-04 16:43:43 +03001866 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_2C_BRIDGE:
1867 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_4C_BRIDGE:
1868 case PCI_DEVICE_ID_INTEL_TITAN_RIDGE_DD_BRIDGE:
Mika Westerberg3cdb9442018-01-16 22:19:00 +02001869 case PCI_DEVICE_ID_INTEL_ICL_NHI0:
1870 case PCI_DEVICE_ID_INTEL_ICL_NHI1:
Mika Westerberg2c3c4192017-06-06 15:25:13 +03001871 return 3;
1872
1873 default:
Mika Westerbergb0407982019-12-17 15:33:40 +03001874 if (tb_switch_is_usb4(sw))
1875 return 4;
1876
Mika Westerberg2c3c4192017-06-06 15:25:13 +03001877 /*
1878 * For unknown switches assume generation to be 1 to be
1879 * on the safe side.
1880 */
1881 tb_sw_warn(sw, "unsupported switch device id %#x\n",
1882 sw->config.device_id);
1883 return 1;
1884 }
1885}
1886
Mika Westerbergb0407982019-12-17 15:33:40 +03001887static bool tb_switch_exceeds_max_depth(const struct tb_switch *sw, int depth)
1888{
1889 int max_depth;
1890
1891 if (tb_switch_is_usb4(sw) ||
1892 (sw->tb->root_switch && tb_switch_is_usb4(sw->tb->root_switch)))
1893 max_depth = USB4_SWITCH_MAX_DEPTH;
1894 else
1895 max_depth = TB_SWITCH_MAX_DEPTH;
1896
1897 return depth > max_depth;
1898}
1899
Andreas Noevera25c8b22014-06-03 22:04:02 +02001900/**
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001901 * tb_switch_alloc() - allocate a switch
1902 * @tb: Pointer to the owning domain
1903 * @parent: Parent device for this switch
1904 * @route: Route string for this switch
Andreas Noevera25c8b22014-06-03 22:04:02 +02001905 *
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001906 * Allocates and initializes a switch. Will not upload configuration to
1907 * the switch. For that you need to call tb_switch_configure()
1908 * separately. The returned switch should be released by calling
1909 * tb_switch_put().
1910 *
Mika Westerberg444ac382018-12-30 12:17:52 +02001911 * Return: Pointer to the allocated switch or ERR_PTR() in case of
1912 * failure.
Andreas Noevera25c8b22014-06-03 22:04:02 +02001913 */
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001914struct tb_switch *tb_switch_alloc(struct tb *tb, struct device *parent,
1915 u64 route)
Andreas Noevera25c8b22014-06-03 22:04:02 +02001916{
Andreas Noevera25c8b22014-06-03 22:04:02 +02001917 struct tb_switch *sw;
Mika Westerbergf0342e72018-12-30 12:14:46 +02001918 int upstream_port;
Mika Westerberg444ac382018-12-30 12:17:52 +02001919 int i, ret, depth;
Mika Westerbergf0342e72018-12-30 12:14:46 +02001920
Mika Westerbergb0407982019-12-17 15:33:40 +03001921 /* Unlock the downstream port so we can access the switch below */
1922 if (route) {
1923 struct tb_switch *parent_sw = tb_to_switch(parent);
1924 struct tb_port *down;
1925
1926 down = tb_port_at(route, parent_sw);
1927 tb_port_unlock(down);
1928 }
1929
Mika Westerbergf0342e72018-12-30 12:14:46 +02001930 depth = tb_route_length(route);
Mika Westerbergf0342e72018-12-30 12:14:46 +02001931
1932 upstream_port = tb_cfg_get_upstream_port(tb->ctl, route);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001933 if (upstream_port < 0)
Mika Westerberg444ac382018-12-30 12:17:52 +02001934 return ERR_PTR(upstream_port);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001935
1936 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
1937 if (!sw)
Mika Westerberg444ac382018-12-30 12:17:52 +02001938 return ERR_PTR(-ENOMEM);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001939
1940 sw->tb = tb;
Mika Westerberg444ac382018-12-30 12:17:52 +02001941 ret = tb_cfg_read(tb->ctl, &sw->config, route, 0, TB_CFG_SWITCH, 0, 5);
1942 if (ret)
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001943 goto err_free_sw_ports;
1944
Mika Westerbergb0407982019-12-17 15:33:40 +03001945 sw->generation = tb_switch_get_generation(sw);
1946
Mika Westerbergdaa51402018-10-01 12:31:19 +03001947 tb_dbg(tb, "current switch config:\n");
Mika Westerbergb0407982019-12-17 15:33:40 +03001948 tb_dump_switch(tb, sw);
Andreas Noevera25c8b22014-06-03 22:04:02 +02001949
1950 /* configure switch */
1951 sw->config.upstream_port_number = upstream_port;
Mika Westerbergf0342e72018-12-30 12:14:46 +02001952 sw->config.depth = depth;
1953 sw->config.route_hi = upper_32_bits(route);
1954 sw->config.route_lo = lower_32_bits(route);
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001955 sw->config.enabled = 0;
Andreas Noevera25c8b22014-06-03 22:04:02 +02001956
Mika Westerbergb0407982019-12-17 15:33:40 +03001957 /* Make sure we do not exceed maximum topology limit */
Colin Ian King704a9402019-12-20 22:05:26 +00001958 if (tb_switch_exceeds_max_depth(sw, depth)) {
1959 ret = -EADDRNOTAVAIL;
1960 goto err_free_sw_ports;
1961 }
Mika Westerbergb0407982019-12-17 15:33:40 +03001962
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001963 /* initialize ports */
1964 sw->ports = kcalloc(sw->config.max_port_number + 1, sizeof(*sw->ports),
1965 GFP_KERNEL);
Mika Westerberg444ac382018-12-30 12:17:52 +02001966 if (!sw->ports) {
1967 ret = -ENOMEM;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001968 goto err_free_sw_ports;
Mika Westerberg444ac382018-12-30 12:17:52 +02001969 }
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001970
1971 for (i = 0; i <= sw->config.max_port_number; i++) {
1972 /* minimum setup for tb_find_cap and tb_drom_read to work */
1973 sw->ports[i].sw = sw;
1974 sw->ports[i].port = i;
1975 }
1976
Mika Westerberg444ac382018-12-30 12:17:52 +02001977 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_PLUG_EVENTS);
Mika Westerbergb0407982019-12-17 15:33:40 +03001978 if (ret > 0)
1979 sw->cap_plug_events = ret;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001980
Mika Westerberg444ac382018-12-30 12:17:52 +02001981 ret = tb_switch_find_vse_cap(sw, TB_VSE_CAP_LINK_CONTROLLER);
1982 if (ret > 0)
1983 sw->cap_lc = ret;
Mika Westerberga9be5582019-01-09 16:42:12 +02001984
Mika Westerbergf67cf492017-06-06 15:25:16 +03001985 /* Root switch is always authorized */
1986 if (!route)
1987 sw->authorized = true;
1988
Mika Westerbergbfe778a2017-06-06 15:25:01 +03001989 device_initialize(&sw->dev);
1990 sw->dev.parent = parent;
1991 sw->dev.bus = &tb_bus_type;
1992 sw->dev.type = &tb_switch_type;
1993 sw->dev.groups = switch_groups;
1994 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
1995
1996 return sw;
1997
1998err_free_sw_ports:
1999 kfree(sw->ports);
2000 kfree(sw);
2001
Mika Westerberg444ac382018-12-30 12:17:52 +02002002 return ERR_PTR(ret);
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002003}
2004
2005/**
Mika Westerberge6b245c2017-06-06 15:25:17 +03002006 * tb_switch_alloc_safe_mode() - allocate a switch that is in safe mode
2007 * @tb: Pointer to the owning domain
2008 * @parent: Parent device for this switch
2009 * @route: Route string for this switch
2010 *
2011 * This creates a switch in safe mode. This means the switch pretty much
2012 * lacks all capabilities except DMA configuration port before it is
2013 * flashed with a valid NVM firmware.
2014 *
2015 * The returned switch must be released by calling tb_switch_put().
2016 *
Mika Westerberg444ac382018-12-30 12:17:52 +02002017 * Return: Pointer to the allocated switch or ERR_PTR() in case of failure
Mika Westerberge6b245c2017-06-06 15:25:17 +03002018 */
2019struct tb_switch *
2020tb_switch_alloc_safe_mode(struct tb *tb, struct device *parent, u64 route)
2021{
2022 struct tb_switch *sw;
2023
2024 sw = kzalloc(sizeof(*sw), GFP_KERNEL);
2025 if (!sw)
Mika Westerberg444ac382018-12-30 12:17:52 +02002026 return ERR_PTR(-ENOMEM);
Mika Westerberge6b245c2017-06-06 15:25:17 +03002027
2028 sw->tb = tb;
2029 sw->config.depth = tb_route_length(route);
2030 sw->config.route_hi = upper_32_bits(route);
2031 sw->config.route_lo = lower_32_bits(route);
2032 sw->safe_mode = true;
2033
2034 device_initialize(&sw->dev);
2035 sw->dev.parent = parent;
2036 sw->dev.bus = &tb_bus_type;
2037 sw->dev.type = &tb_switch_type;
2038 sw->dev.groups = switch_groups;
2039 dev_set_name(&sw->dev, "%u-%llx", tb->index, tb_route(sw));
2040
2041 return sw;
2042}
2043
2044/**
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002045 * tb_switch_configure() - Uploads configuration to the switch
2046 * @sw: Switch to configure
2047 *
2048 * Call this function before the switch is added to the system. It will
2049 * upload configuration to the switch and makes it available for the
Mika Westerbergb0407982019-12-17 15:33:40 +03002050 * connection manager to use. Can be called to the switch again after
2051 * resume from low power states to re-initialize it.
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002052 *
2053 * Return: %0 in case of success and negative errno in case of failure
2054 */
2055int tb_switch_configure(struct tb_switch *sw)
2056{
2057 struct tb *tb = sw->tb;
2058 u64 route;
2059 int ret;
2060
2061 route = tb_route(sw);
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002062
Mika Westerbergb0407982019-12-17 15:33:40 +03002063 tb_dbg(tb, "%s Switch at %#llx (depth: %d, up port: %d)\n",
Mika Westerbergb2911a52019-12-06 18:36:07 +02002064 sw->config.enabled ? "restoring" : "initializing", route,
Mika Westerbergb0407982019-12-17 15:33:40 +03002065 tb_route_length(route), sw->config.upstream_port_number);
Andreas Noevera25c8b22014-06-03 22:04:02 +02002066
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002067 sw->config.enabled = 1;
2068
Mika Westerbergb0407982019-12-17 15:33:40 +03002069 if (tb_switch_is_usb4(sw)) {
2070 /*
2071 * For USB4 devices, we need to program the CM version
2072 * accordingly so that it knows to expose all the
2073 * additional capabilities.
2074 */
2075 sw->config.cmuv = USB4_VERSION_1_0;
Andreas Noevera25c8b22014-06-03 22:04:02 +02002076
Mika Westerbergb0407982019-12-17 15:33:40 +03002077 /* Enumerate the switch */
2078 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2079 ROUTER_CS_1, 4);
2080 if (ret)
2081 return ret;
2082
2083 ret = usb4_switch_setup(sw);
Mika Westerbergb0407982019-12-17 15:33:40 +03002084 } else {
2085 if (sw->config.vendor_id != PCI_VENDOR_ID_INTEL)
2086 tb_sw_warn(sw, "unknown switch vendor id %#x\n",
2087 sw->config.vendor_id);
2088
2089 if (!sw->cap_plug_events) {
2090 tb_sw_warn(sw, "cannot find TB_VSE_CAP_PLUG_EVENTS aborting\n");
2091 return -ENODEV;
2092 }
2093
2094 /* Enumerate the switch */
2095 ret = tb_sw_write(sw, (u32 *)&sw->config + 1, TB_CFG_SWITCH,
2096 ROUTER_CS_1, 3);
Mika Westerbergb0407982019-12-17 15:33:40 +03002097 }
Mika Westerberge879a702018-10-11 12:33:08 +03002098 if (ret)
2099 return ret;
2100
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002101 return tb_plug_events_active(sw, true);
2102}
Andreas Noevera25c8b22014-06-03 22:04:02 +02002103
Aditya Pakki2cc12752019-03-20 10:57:54 -05002104static int tb_switch_set_uuid(struct tb_switch *sw)
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002105{
Mika Westerbergb0407982019-12-17 15:33:40 +03002106 bool uid = false;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002107 u32 uuid[4];
Mika Westerberga9be5582019-01-09 16:42:12 +02002108 int ret;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002109
2110 if (sw->uuid)
Mika Westerberga9be5582019-01-09 16:42:12 +02002111 return 0;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002112
Mika Westerbergb0407982019-12-17 15:33:40 +03002113 if (tb_switch_is_usb4(sw)) {
2114 ret = usb4_switch_read_uid(sw, &sw->uid);
2115 if (ret)
2116 return ret;
2117 uid = true;
2118 } else {
2119 /*
2120 * The newer controllers include fused UUID as part of
2121 * link controller specific registers
2122 */
2123 ret = tb_lc_read_uuid(sw, uuid);
2124 if (ret) {
2125 if (ret != -EINVAL)
2126 return ret;
2127 uid = true;
2128 }
2129 }
2130
2131 if (uid) {
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002132 /*
2133 * ICM generates UUID based on UID and fills the upper
2134 * two words with ones. This is not strictly following
2135 * UUID format but we want to be compatible with it so
2136 * we do the same here.
2137 */
2138 uuid[0] = sw->uid & 0xffffffff;
2139 uuid[1] = (sw->uid >> 32) & 0xffffffff;
2140 uuid[2] = 0xffffffff;
2141 uuid[3] = 0xffffffff;
Andreas Noevera25c8b22014-06-03 22:04:02 +02002142 }
2143
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002144 sw->uuid = kmemdup(uuid, sizeof(uuid), GFP_KERNEL);
Aditya Pakki2cc12752019-03-20 10:57:54 -05002145 if (!sw->uuid)
Mika Westerberga9be5582019-01-09 16:42:12 +02002146 return -ENOMEM;
2147 return 0;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002148}
2149
Mika Westerberge6b245c2017-06-06 15:25:17 +03002150static int tb_switch_add_dma_port(struct tb_switch *sw)
Mika Westerberg3e136762017-06-06 15:25:14 +03002151{
Mika Westerberge6b245c2017-06-06 15:25:17 +03002152 u32 status;
2153 int ret;
2154
Mika Westerberg3e136762017-06-06 15:25:14 +03002155 switch (sw->generation) {
Mika Westerberg3e136762017-06-06 15:25:14 +03002156 case 2:
2157 /* Only root switch can be upgraded */
2158 if (tb_route(sw))
Mika Westerberge6b245c2017-06-06 15:25:17 +03002159 return 0;
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +03002160
Gustavo A. R. Silvadf561f662020-08-23 17:36:59 -05002161 fallthrough;
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +03002162 case 3:
Mika Westerberg661b1942020-11-10 11:34:07 +03002163 case 4:
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +03002164 ret = tb_switch_set_uuid(sw);
2165 if (ret)
2166 return ret;
Mika Westerberg3e136762017-06-06 15:25:14 +03002167 break;
2168
2169 default:
Mika Westerberge6b245c2017-06-06 15:25:17 +03002170 /*
2171 * DMA port is the only thing available when the switch
2172 * is in safe mode.
2173 */
2174 if (!sw->safe_mode)
2175 return 0;
2176 break;
Mika Westerberg3e136762017-06-06 15:25:14 +03002177 }
2178
Mika Westerberg661b1942020-11-10 11:34:07 +03002179 if (sw->no_nvm_upgrade)
2180 return 0;
2181
2182 if (tb_switch_is_usb4(sw)) {
2183 ret = usb4_switch_nvm_authenticate_status(sw, &status);
2184 if (ret)
2185 return ret;
2186
2187 if (status) {
2188 tb_sw_info(sw, "switch flash authentication failed\n");
2189 nvm_set_auth_status(sw, status);
2190 }
2191
2192 return 0;
2193 }
2194
Mika Westerberg3f415e52019-02-05 12:51:40 +03002195 /* Root switch DMA port requires running firmware */
Mika Westerbergf07a3602019-06-25 15:10:01 +03002196 if (!tb_route(sw) && !tb_switch_is_icm(sw))
Mika Westerberge6b245c2017-06-06 15:25:17 +03002197 return 0;
2198
Mika Westerberg3e136762017-06-06 15:25:14 +03002199 sw->dma_port = dma_port_alloc(sw);
Mika Westerberge6b245c2017-06-06 15:25:17 +03002200 if (!sw->dma_port)
2201 return 0;
2202
2203 /*
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +03002204 * If there is status already set then authentication failed
2205 * when the dma_port_flash_update_auth() returned. Power cycling
2206 * is not needed (it was done already) so only thing we do here
2207 * is to unblock runtime PM of the root port.
2208 */
2209 nvm_get_auth_status(sw, &status);
2210 if (status) {
2211 if (!tb_route(sw))
Mika Westerbergb0407982019-12-17 15:33:40 +03002212 nvm_authenticate_complete_dma_port(sw);
Mika Westerberg7a7ebfa2019-11-11 13:25:44 +03002213 return 0;
2214 }
2215
2216 /*
Mika Westerberge6b245c2017-06-06 15:25:17 +03002217 * Check status of the previous flash authentication. If there
2218 * is one we need to power cycle the switch in any case to make
2219 * it functional again.
2220 */
2221 ret = dma_port_flash_update_auth_status(sw->dma_port, &status);
2222 if (ret <= 0)
2223 return ret;
2224
Mika Westerberg1830b6e2018-11-26 12:47:46 +03002225 /* Now we can allow root port to suspend again */
2226 if (!tb_route(sw))
Mika Westerbergb0407982019-12-17 15:33:40 +03002227 nvm_authenticate_complete_dma_port(sw);
Mika Westerberg1830b6e2018-11-26 12:47:46 +03002228
Mika Westerberge6b245c2017-06-06 15:25:17 +03002229 if (status) {
2230 tb_sw_info(sw, "switch flash authentication failed\n");
Mika Westerberge6b245c2017-06-06 15:25:17 +03002231 nvm_set_auth_status(sw, status);
2232 }
2233
2234 tb_sw_info(sw, "power cycling the switch now\n");
2235 dma_port_power_cycle(sw->dma_port);
2236
2237 /*
2238 * We return error here which causes the switch adding failure.
2239 * It should appear back after power cycle is complete.
2240 */
2241 return -ESHUTDOWN;
Mika Westerberg3e136762017-06-06 15:25:14 +03002242}
2243
Mika Westerberg0d46c082019-08-26 18:19:33 +03002244static void tb_switch_default_link_ports(struct tb_switch *sw)
2245{
2246 int i;
2247
2248 for (i = 1; i <= sw->config.max_port_number; i += 2) {
2249 struct tb_port *port = &sw->ports[i];
2250 struct tb_port *subordinate;
2251
2252 if (!tb_port_is_null(port))
2253 continue;
2254
2255 /* Check for the subordinate port */
2256 if (i == sw->config.max_port_number ||
2257 !tb_port_is_null(&sw->ports[i + 1]))
2258 continue;
2259
2260 /* Link them if not already done so (by DROM) */
2261 subordinate = &sw->ports[i + 1];
2262 if (!port->dual_link_port && !subordinate->dual_link_port) {
2263 port->link_nr = 0;
2264 port->dual_link_port = subordinate;
2265 subordinate->link_nr = 1;
2266 subordinate->dual_link_port = port;
2267
2268 tb_sw_dbg(sw, "linked ports %d <-> %d\n",
2269 port->port, subordinate->port);
2270 }
2271 }
2272}
2273
Mika Westerberg91c0c122019-03-21 19:03:00 +02002274static bool tb_switch_lane_bonding_possible(struct tb_switch *sw)
2275{
2276 const struct tb_port *up = tb_upstream_port(sw);
2277
2278 if (!up->dual_link_port || !up->dual_link_port->remote)
2279 return false;
2280
Mika Westerbergb0407982019-12-17 15:33:40 +03002281 if (tb_switch_is_usb4(sw))
2282 return usb4_switch_lane_bonding_possible(sw);
Mika Westerberg91c0c122019-03-21 19:03:00 +02002283 return tb_lc_lane_bonding_possible(sw);
2284}
2285
2286static int tb_switch_update_link_attributes(struct tb_switch *sw)
2287{
2288 struct tb_port *up;
2289 bool change = false;
2290 int ret;
2291
2292 if (!tb_route(sw) || tb_switch_is_icm(sw))
2293 return 0;
2294
2295 up = tb_upstream_port(sw);
2296
2297 ret = tb_port_get_link_speed(up);
2298 if (ret < 0)
2299 return ret;
2300 if (sw->link_speed != ret)
2301 change = true;
2302 sw->link_speed = ret;
2303
2304 ret = tb_port_get_link_width(up);
2305 if (ret < 0)
2306 return ret;
2307 if (sw->link_width != ret)
2308 change = true;
2309 sw->link_width = ret;
2310
2311 /* Notify userspace that there is possible link attribute change */
2312 if (device_is_registered(&sw->dev) && change)
2313 kobject_uevent(&sw->dev.kobj, KOBJ_CHANGE);
2314
2315 return 0;
2316}
2317
2318/**
2319 * tb_switch_lane_bonding_enable() - Enable lane bonding
2320 * @sw: Switch to enable lane bonding
2321 *
2322 * Connection manager can call this function to enable lane bonding of a
2323 * switch. If conditions are correct and both switches support the feature,
2324 * lanes are bonded. It is safe to call this to any switch.
2325 */
2326int tb_switch_lane_bonding_enable(struct tb_switch *sw)
2327{
2328 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2329 struct tb_port *up, *down;
2330 u64 route = tb_route(sw);
2331 int ret;
2332
2333 if (!route)
2334 return 0;
2335
2336 if (!tb_switch_lane_bonding_possible(sw))
2337 return 0;
2338
2339 up = tb_upstream_port(sw);
2340 down = tb_port_at(route, parent);
2341
2342 if (!tb_port_is_width_supported(up, 2) ||
2343 !tb_port_is_width_supported(down, 2))
2344 return 0;
2345
2346 ret = tb_port_lane_bonding_enable(up);
2347 if (ret) {
2348 tb_port_warn(up, "failed to enable lane bonding\n");
2349 return ret;
2350 }
2351
2352 ret = tb_port_lane_bonding_enable(down);
2353 if (ret) {
2354 tb_port_warn(down, "failed to enable lane bonding\n");
2355 tb_port_lane_bonding_disable(up);
2356 return ret;
2357 }
2358
2359 tb_switch_update_link_attributes(sw);
2360
2361 tb_sw_dbg(sw, "lane bonding enabled\n");
2362 return ret;
2363}
2364
2365/**
2366 * tb_switch_lane_bonding_disable() - Disable lane bonding
2367 * @sw: Switch whose lane bonding to disable
2368 *
2369 * Disables lane bonding between @sw and parent. This can be called even
2370 * if lanes were not bonded originally.
2371 */
2372void tb_switch_lane_bonding_disable(struct tb_switch *sw)
2373{
2374 struct tb_switch *parent = tb_to_switch(sw->dev.parent);
2375 struct tb_port *up, *down;
2376
2377 if (!tb_route(sw))
2378 return;
2379
2380 up = tb_upstream_port(sw);
2381 if (!up->bonded)
2382 return;
2383
2384 down = tb_port_at(tb_route(sw), parent);
2385
2386 tb_port_lane_bonding_disable(up);
2387 tb_port_lane_bonding_disable(down);
2388
2389 tb_switch_update_link_attributes(sw);
2390 tb_sw_dbg(sw, "lane bonding disabled\n");
2391}
2392
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002393/**
Mika Westerbergde462032020-04-02 14:50:52 +03002394 * tb_switch_configure_link() - Set link configured
2395 * @sw: Switch whose link is configured
2396 *
2397 * Sets the link upstream from @sw configured (from both ends) so that
2398 * it will not be disconnected when the domain exits sleep. Can be
2399 * called for any switch.
2400 *
2401 * It is recommended that this is called after lane bonding is enabled.
2402 *
2403 * Returns %0 on success and negative errno in case of error.
2404 */
2405int tb_switch_configure_link(struct tb_switch *sw)
2406{
Mika Westerberge28178b2020-04-02 12:42:44 +03002407 struct tb_port *up, *down;
2408 int ret;
2409
Mika Westerbergde462032020-04-02 14:50:52 +03002410 if (!tb_route(sw) || tb_switch_is_icm(sw))
2411 return 0;
2412
Mika Westerberge28178b2020-04-02 12:42:44 +03002413 up = tb_upstream_port(sw);
2414 if (tb_switch_is_usb4(up->sw))
2415 ret = usb4_port_configure(up);
2416 else
2417 ret = tb_lc_configure_port(up);
2418 if (ret)
2419 return ret;
2420
2421 down = up->remote;
2422 if (tb_switch_is_usb4(down->sw))
2423 return usb4_port_configure(down);
2424 return tb_lc_configure_port(down);
Mika Westerbergde462032020-04-02 14:50:52 +03002425}
2426
2427/**
2428 * tb_switch_unconfigure_link() - Unconfigure link
2429 * @sw: Switch whose link is unconfigured
2430 *
2431 * Sets the link unconfigured so the @sw will be disconnected if the
2432 * domain exists sleep.
2433 */
2434void tb_switch_unconfigure_link(struct tb_switch *sw)
2435{
Mika Westerberge28178b2020-04-02 12:42:44 +03002436 struct tb_port *up, *down;
2437
Mika Westerbergde462032020-04-02 14:50:52 +03002438 if (sw->is_unplugged)
2439 return;
2440 if (!tb_route(sw) || tb_switch_is_icm(sw))
2441 return;
2442
Mika Westerberge28178b2020-04-02 12:42:44 +03002443 up = tb_upstream_port(sw);
2444 if (tb_switch_is_usb4(up->sw))
2445 usb4_port_unconfigure(up);
Mika Westerbergde462032020-04-02 14:50:52 +03002446 else
Mika Westerberge28178b2020-04-02 12:42:44 +03002447 tb_lc_unconfigure_port(up);
2448
2449 down = up->remote;
2450 if (tb_switch_is_usb4(down->sw))
2451 usb4_port_unconfigure(down);
2452 else
2453 tb_lc_unconfigure_port(down);
Mika Westerbergde462032020-04-02 14:50:52 +03002454}
2455
2456/**
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002457 * tb_switch_add() - Add a switch to the domain
2458 * @sw: Switch to add
2459 *
2460 * This is the last step in adding switch to the domain. It will read
2461 * identification information from DROM and initializes ports so that
2462 * they can be used to connect other switches. The switch will be
2463 * exposed to the userspace when this function successfully returns. To
2464 * remove and release the switch, call tb_switch_remove().
2465 *
2466 * Return: %0 in case of success and negative errno in case of failure
2467 */
2468int tb_switch_add(struct tb_switch *sw)
2469{
2470 int i, ret;
Andreas Noeverca389f72014-06-03 22:04:04 +02002471
Mika Westerberg3e136762017-06-06 15:25:14 +03002472 /*
2473 * Initialize DMA control port now before we read DROM. Recent
2474 * host controllers have more complete DROM on NVM that includes
2475 * vendor and model identification strings which we then expose
2476 * to the userspace. NVM can be accessed through DMA
2477 * configuration based mailbox.
2478 */
Mika Westerberge6b245c2017-06-06 15:25:17 +03002479 ret = tb_switch_add_dma_port(sw);
Mika Westerbergaf99f692019-08-27 15:18:20 +03002480 if (ret) {
2481 dev_err(&sw->dev, "failed to add DMA port\n");
Mika Westerbergf53e7672017-06-06 15:25:02 +03002482 return ret;
Mika Westerbergaf99f692019-08-27 15:18:20 +03002483 }
Andreas Noever343fcb82014-06-12 23:11:47 +02002484
Mika Westerberge6b245c2017-06-06 15:25:17 +03002485 if (!sw->safe_mode) {
2486 /* read drom */
2487 ret = tb_drom_read(sw);
2488 if (ret) {
Mika Westerbergaf99f692019-08-27 15:18:20 +03002489 dev_err(&sw->dev, "reading DROM failed\n");
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002490 return ret;
Mika Westerberge6b245c2017-06-06 15:25:17 +03002491 }
Mika Westerbergdaa51402018-10-01 12:31:19 +03002492 tb_sw_dbg(sw, "uid: %#llx\n", sw->uid);
Mika Westerberge6b245c2017-06-06 15:25:17 +03002493
Aditya Pakki2cc12752019-03-20 10:57:54 -05002494 ret = tb_switch_set_uuid(sw);
Mika Westerbergaf99f692019-08-27 15:18:20 +03002495 if (ret) {
2496 dev_err(&sw->dev, "failed to set UUID\n");
Aditya Pakki2cc12752019-03-20 10:57:54 -05002497 return ret;
Mika Westerbergaf99f692019-08-27 15:18:20 +03002498 }
Mika Westerberge6b245c2017-06-06 15:25:17 +03002499
2500 for (i = 0; i <= sw->config.max_port_number; i++) {
2501 if (sw->ports[i].disabled) {
Mika Westerbergdaa51402018-10-01 12:31:19 +03002502 tb_port_dbg(&sw->ports[i], "disabled by eeprom\n");
Mika Westerberge6b245c2017-06-06 15:25:17 +03002503 continue;
2504 }
2505 ret = tb_init_port(&sw->ports[i]);
Mika Westerbergaf99f692019-08-27 15:18:20 +03002506 if (ret) {
2507 dev_err(&sw->dev, "failed to initialize port %d\n", i);
Mika Westerberge6b245c2017-06-06 15:25:17 +03002508 return ret;
Mika Westerbergaf99f692019-08-27 15:18:20 +03002509 }
Mika Westerberge6b245c2017-06-06 15:25:17 +03002510 }
Mika Westerberg91c0c122019-03-21 19:03:00 +02002511
Mika Westerberg0d46c082019-08-26 18:19:33 +03002512 tb_switch_default_link_ports(sw);
2513
Mika Westerberg91c0c122019-03-21 19:03:00 +02002514 ret = tb_switch_update_link_attributes(sw);
2515 if (ret)
2516 return ret;
Rajmohan Manicf29b9af2019-12-17 15:33:43 +03002517
2518 ret = tb_switch_tmu_init(sw);
2519 if (ret)
2520 return ret;
Andreas Noever343fcb82014-06-12 23:11:47 +02002521 }
2522
Mika Westerberge6b245c2017-06-06 15:25:17 +03002523 ret = device_add(&sw->dev);
Mika Westerbergaf99f692019-08-27 15:18:20 +03002524 if (ret) {
2525 dev_err(&sw->dev, "failed to add device: %d\n", ret);
Mika Westerberge6b245c2017-06-06 15:25:17 +03002526 return ret;
Mika Westerbergaf99f692019-08-27 15:18:20 +03002527 }
Mika Westerberge6b245c2017-06-06 15:25:17 +03002528
Mika Westerberga83bc4a2018-10-01 12:31:20 +03002529 if (tb_route(sw)) {
2530 dev_info(&sw->dev, "new device found, vendor=%#x device=%#x\n",
2531 sw->vendor, sw->device);
2532 if (sw->vendor_name && sw->device_name)
2533 dev_info(&sw->dev, "%s %s\n", sw->vendor_name,
2534 sw->device_name);
2535 }
2536
Mika Westerberge6b245c2017-06-06 15:25:17 +03002537 ret = tb_switch_nvm_add(sw);
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03002538 if (ret) {
Mika Westerbergaf99f692019-08-27 15:18:20 +03002539 dev_err(&sw->dev, "failed to add NVM devices\n");
Mika Westerberge6b245c2017-06-06 15:25:17 +03002540 device_del(&sw->dev);
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03002541 return ret;
2542 }
Mika Westerberge6b245c2017-06-06 15:25:17 +03002543
Mika Westerbergb2911a52019-12-06 18:36:07 +02002544 /*
2545 * Thunderbolt routers do not generate wakeups themselves but
2546 * they forward wakeups from tunneled protocols, so enable it
2547 * here.
2548 */
2549 device_init_wakeup(&sw->dev, true);
2550
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03002551 pm_runtime_set_active(&sw->dev);
2552 if (sw->rpm) {
2553 pm_runtime_set_autosuspend_delay(&sw->dev, TB_AUTOSUSPEND_DELAY);
2554 pm_runtime_use_autosuspend(&sw->dev);
2555 pm_runtime_mark_last_busy(&sw->dev);
2556 pm_runtime_enable(&sw->dev);
2557 pm_request_autosuspend(&sw->dev);
2558 }
2559
Gil Fine54e41812020-06-29 20:30:52 +03002560 tb_switch_debugfs_init(sw);
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03002561 return 0;
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002562}
Andreas Noeverc90553b2014-06-03 22:04:11 +02002563
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002564/**
2565 * tb_switch_remove() - Remove and release a switch
2566 * @sw: Switch to remove
2567 *
2568 * This will remove the switch from the domain and release it after last
2569 * reference count drops to zero. If there are switches connected below
2570 * this switch, they will be removed as well.
2571 */
2572void tb_switch_remove(struct tb_switch *sw)
2573{
Mika Westerbergb433d012019-09-30 14:07:22 +03002574 struct tb_port *port;
Andreas Noeverca389f72014-06-03 22:04:04 +02002575
Gil Fine54e41812020-06-29 20:30:52 +03002576 tb_switch_debugfs_remove(sw);
2577
Mika Westerberg2d8ff0b2018-07-25 11:48:39 +03002578 if (sw->rpm) {
2579 pm_runtime_get_sync(&sw->dev);
2580 pm_runtime_disable(&sw->dev);
2581 }
2582
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002583 /* port 0 is the switch itself and never has a remote */
Mika Westerbergb433d012019-09-30 14:07:22 +03002584 tb_switch_for_each_port(sw, port) {
2585 if (tb_port_has_remote(port)) {
2586 tb_switch_remove(port->remote->sw);
2587 port->remote = NULL;
2588 } else if (port->xdomain) {
2589 tb_xdomain_remove(port->xdomain);
2590 port->xdomain = NULL;
Mika Westerbergdfe40ca2019-03-07 15:26:45 +02002591 }
Kranthi Kuntaladacb1282020-03-05 16:39:58 +02002592
2593 /* Remove any downstream retimers */
2594 tb_retimer_remove_all(port);
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002595 }
2596
2597 if (!sw->is_unplugged)
2598 tb_plug_events_active(sw, false);
Mika Westerbergb0407982019-12-17 15:33:40 +03002599
Mika Westerberge6b245c2017-06-06 15:25:17 +03002600 tb_switch_nvm_remove(sw);
Mika Westerberga83bc4a2018-10-01 12:31:20 +03002601
2602 if (tb_route(sw))
2603 dev_info(&sw->dev, "device disconnected\n");
Mika Westerbergbfe778a2017-06-06 15:25:01 +03002604 device_unregister(&sw->dev);
Andreas Noevera25c8b22014-06-03 22:04:02 +02002605}
2606
Andreas Noever053596d2014-06-03 22:04:06 +02002607/**
Lukas Wunneraae20bb2016-03-20 13:57:20 +01002608 * tb_sw_set_unplugged() - set is_unplugged on switch and downstream switches
Andreas Noever053596d2014-06-03 22:04:06 +02002609 */
Lukas Wunneraae20bb2016-03-20 13:57:20 +01002610void tb_sw_set_unplugged(struct tb_switch *sw)
Andreas Noever053596d2014-06-03 22:04:06 +02002611{
Mika Westerbergb433d012019-09-30 14:07:22 +03002612 struct tb_port *port;
2613
Andreas Noever053596d2014-06-03 22:04:06 +02002614 if (sw == sw->tb->root_switch) {
2615 tb_sw_WARN(sw, "cannot unplug root switch\n");
2616 return;
2617 }
2618 if (sw->is_unplugged) {
2619 tb_sw_WARN(sw, "is_unplugged already set\n");
2620 return;
2621 }
2622 sw->is_unplugged = true;
Mika Westerbergb433d012019-09-30 14:07:22 +03002623 tb_switch_for_each_port(sw, port) {
2624 if (tb_port_has_remote(port))
2625 tb_sw_set_unplugged(port->remote->sw);
2626 else if (port->xdomain)
2627 port->xdomain->is_unplugged = true;
Andreas Noever053596d2014-06-03 22:04:06 +02002628 }
2629}
2630
Mika Westerbergb2911a52019-12-06 18:36:07 +02002631static int tb_switch_set_wake(struct tb_switch *sw, unsigned int flags)
2632{
2633 if (flags)
2634 tb_sw_dbg(sw, "enabling wakeup: %#x\n", flags);
2635 else
2636 tb_sw_dbg(sw, "disabling wakeup\n");
2637
2638 if (tb_switch_is_usb4(sw))
2639 return usb4_switch_set_wake(sw, flags);
2640 return tb_lc_set_wake(sw, flags);
2641}
2642
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002643int tb_switch_resume(struct tb_switch *sw)
2644{
Mika Westerbergb433d012019-09-30 14:07:22 +03002645 struct tb_port *port;
2646 int err;
2647
Mika Westerbergdaa51402018-10-01 12:31:19 +03002648 tb_sw_dbg(sw, "resuming switch\n");
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002649
Mika Westerberg08a5e4c2017-06-06 15:24:54 +03002650 /*
2651 * Check for UID of the connected switches except for root
2652 * switch which we assume cannot be removed.
2653 */
2654 if (tb_route(sw)) {
2655 u64 uid;
2656
Mika Westerberg7ea4cd62018-09-28 16:41:01 +03002657 /*
2658 * Check first that we can still read the switch config
2659 * space. It may be that there is now another domain
2660 * connected.
2661 */
2662 err = tb_cfg_get_upstream_port(sw->tb->ctl, tb_route(sw));
2663 if (err < 0) {
2664 tb_sw_info(sw, "switch not present anymore\n");
2665 return err;
2666 }
2667
Mika Westerbergb0407982019-12-17 15:33:40 +03002668 if (tb_switch_is_usb4(sw))
2669 err = usb4_switch_read_uid(sw, &uid);
2670 else
2671 err = tb_drom_read_uid_only(sw, &uid);
Mika Westerberg08a5e4c2017-06-06 15:24:54 +03002672 if (err) {
2673 tb_sw_warn(sw, "uid read failed\n");
2674 return err;
2675 }
2676 if (sw->uid != uid) {
2677 tb_sw_info(sw,
2678 "changed while suspended (uid %#llx -> %#llx)\n",
2679 sw->uid, uid);
2680 return -ENODEV;
2681 }
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002682 }
2683
Mika Westerbergb0407982019-12-17 15:33:40 +03002684 err = tb_switch_configure(sw);
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002685 if (err)
2686 return err;
2687
Mika Westerbergb2911a52019-12-06 18:36:07 +02002688 /* Disable wakes */
2689 tb_switch_set_wake(sw, 0);
2690
Mika Westerberg8145c432020-03-27 17:20:31 +02002691 err = tb_switch_tmu_init(sw);
2692 if (err)
2693 return err;
2694
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002695 /* check for surviving downstream switches */
Mika Westerbergb433d012019-09-30 14:07:22 +03002696 tb_switch_for_each_port(sw, port) {
Mika Westerberg7ea4cd62018-09-28 16:41:01 +03002697 if (!tb_port_has_remote(port) && !port->xdomain)
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002698 continue;
Mika Westerbergdfe40ca2019-03-07 15:26:45 +02002699
Mika Westerberg7ea4cd62018-09-28 16:41:01 +03002700 if (tb_wait_for_port(port, true) <= 0) {
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002701 tb_port_warn(port,
2702 "lost during suspend, disconnecting\n");
Mika Westerberg7ea4cd62018-09-28 16:41:01 +03002703 if (tb_port_has_remote(port))
2704 tb_sw_set_unplugged(port->remote->sw);
2705 else if (port->xdomain)
2706 port->xdomain->is_unplugged = true;
Mika Westerbergb0407982019-12-17 15:33:40 +03002707 } else if (tb_port_has_remote(port) || port->xdomain) {
2708 /*
2709 * Always unlock the port so the downstream
2710 * switch/domain is accessible.
2711 */
2712 if (tb_port_unlock(port))
2713 tb_port_warn(port, "failed to unlock port\n");
2714 if (port->remote && tb_switch_resume(port->remote->sw)) {
Mika Westerberg7ea4cd62018-09-28 16:41:01 +03002715 tb_port_warn(port,
2716 "lost during suspend, disconnecting\n");
2717 tb_sw_set_unplugged(port->remote->sw);
2718 }
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002719 }
2720 }
2721 return 0;
2722}
2723
Mika Westerberg6ac6fae2020-06-05 14:25:02 +03002724/**
2725 * tb_switch_suspend() - Put a switch to sleep
2726 * @sw: Switch to suspend
2727 * @runtime: Is this runtime suspend or system sleep
2728 *
2729 * Suspends router and all its children. Enables wakes according to
2730 * value of @runtime and then sets sleep bit for the router. If @sw is
2731 * host router the domain is ready to go to sleep once this function
2732 * returns.
2733 */
2734void tb_switch_suspend(struct tb_switch *sw, bool runtime)
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002735{
Mika Westerbergb2911a52019-12-06 18:36:07 +02002736 unsigned int flags = 0;
Mika Westerbergb433d012019-09-30 14:07:22 +03002737 struct tb_port *port;
2738 int err;
2739
Mika Westerberg6ac6fae2020-06-05 14:25:02 +03002740 tb_sw_dbg(sw, "suspending switch\n");
2741
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002742 err = tb_plug_events_active(sw, false);
2743 if (err)
2744 return;
2745
Mika Westerbergb433d012019-09-30 14:07:22 +03002746 tb_switch_for_each_port(sw, port) {
2747 if (tb_port_has_remote(port))
Mika Westerberg6ac6fae2020-06-05 14:25:02 +03002748 tb_switch_suspend(port->remote->sw, runtime);
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002749 }
Mika Westerberg5480dfc2019-01-09 17:25:43 +02002750
Mika Westerberg6ac6fae2020-06-05 14:25:02 +03002751 if (runtime) {
2752 /* Trigger wake when something is plugged in/out */
2753 flags |= TB_WAKE_ON_CONNECT | TB_WAKE_ON_DISCONNECT;
2754 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
2755 } else if (device_may_wakeup(&sw->dev)) {
2756 flags |= TB_WAKE_ON_USB4 | TB_WAKE_ON_USB3 | TB_WAKE_ON_PCIE;
2757 }
Mika Westerbergb2911a52019-12-06 18:36:07 +02002758
2759 tb_switch_set_wake(sw, flags);
2760
Mika Westerbergb0407982019-12-17 15:33:40 +03002761 if (tb_switch_is_usb4(sw))
2762 usb4_switch_set_sleep(sw);
2763 else
2764 tb_lc_set_sleep(sw);
Andreas Noever23dd5bb2014-06-03 22:04:12 +02002765}
Mika Westerbergf67cf492017-06-06 15:25:16 +03002766
Mika Westerberg8afe9092019-03-26 15:52:30 +03002767/**
2768 * tb_switch_query_dp_resource() - Query availability of DP resource
2769 * @sw: Switch whose DP resource is queried
2770 * @in: DP IN port
2771 *
2772 * Queries availability of DP resource for DP tunneling using switch
2773 * specific means. Returns %true if resource is available.
2774 */
2775bool tb_switch_query_dp_resource(struct tb_switch *sw, struct tb_port *in)
2776{
Mika Westerbergb0407982019-12-17 15:33:40 +03002777 if (tb_switch_is_usb4(sw))
2778 return usb4_switch_query_dp_resource(sw, in);
Mika Westerberg8afe9092019-03-26 15:52:30 +03002779 return tb_lc_dp_sink_query(sw, in);
2780}
2781
2782/**
2783 * tb_switch_alloc_dp_resource() - Allocate available DP resource
2784 * @sw: Switch whose DP resource is allocated
2785 * @in: DP IN port
2786 *
2787 * Allocates DP resource for DP tunneling. The resource must be
2788 * available for this to succeed (see tb_switch_query_dp_resource()).
2789 * Returns %0 in success and negative errno otherwise.
2790 */
2791int tb_switch_alloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
2792{
Mika Westerbergb0407982019-12-17 15:33:40 +03002793 if (tb_switch_is_usb4(sw))
2794 return usb4_switch_alloc_dp_resource(sw, in);
Mika Westerberg8afe9092019-03-26 15:52:30 +03002795 return tb_lc_dp_sink_alloc(sw, in);
2796}
2797
2798/**
2799 * tb_switch_dealloc_dp_resource() - De-allocate DP resource
2800 * @sw: Switch whose DP resource is de-allocated
2801 * @in: DP IN port
2802 *
2803 * De-allocates DP resource that was previously allocated for DP
2804 * tunneling.
2805 */
2806void tb_switch_dealloc_dp_resource(struct tb_switch *sw, struct tb_port *in)
2807{
Mika Westerbergb0407982019-12-17 15:33:40 +03002808 int ret;
2809
2810 if (tb_switch_is_usb4(sw))
2811 ret = usb4_switch_dealloc_dp_resource(sw, in);
2812 else
2813 ret = tb_lc_dp_sink_dealloc(sw, in);
2814
2815 if (ret)
Mika Westerberg8afe9092019-03-26 15:52:30 +03002816 tb_sw_warn(sw, "failed to de-allocate DP resource for port %d\n",
2817 in->port);
Mika Westerberg8afe9092019-03-26 15:52:30 +03002818}
2819
Mika Westerbergf67cf492017-06-06 15:25:16 +03002820struct tb_sw_lookup {
2821 struct tb *tb;
2822 u8 link;
2823 u8 depth;
Christoph Hellwig7c39ffe2017-07-18 15:30:05 +02002824 const uuid_t *uuid;
Radion Mirchevsky8e9267b2017-10-04 15:24:14 +03002825 u64 route;
Mika Westerbergf67cf492017-06-06 15:25:16 +03002826};
2827
Suzuki K Poulose418e3ea2019-06-14 18:53:59 +01002828static int tb_switch_match(struct device *dev, const void *data)
Mika Westerbergf67cf492017-06-06 15:25:16 +03002829{
2830 struct tb_switch *sw = tb_to_switch(dev);
Suzuki K Poulose418e3ea2019-06-14 18:53:59 +01002831 const struct tb_sw_lookup *lookup = data;
Mika Westerbergf67cf492017-06-06 15:25:16 +03002832
2833 if (!sw)
2834 return 0;
2835 if (sw->tb != lookup->tb)
2836 return 0;
2837
2838 if (lookup->uuid)
2839 return !memcmp(sw->uuid, lookup->uuid, sizeof(*lookup->uuid));
2840
Radion Mirchevsky8e9267b2017-10-04 15:24:14 +03002841 if (lookup->route) {
2842 return sw->config.route_lo == lower_32_bits(lookup->route) &&
2843 sw->config.route_hi == upper_32_bits(lookup->route);
2844 }
2845
Mika Westerbergf67cf492017-06-06 15:25:16 +03002846 /* Root switch is matched only by depth */
2847 if (!lookup->depth)
2848 return !sw->depth;
2849
2850 return sw->link == lookup->link && sw->depth == lookup->depth;
2851}
2852
2853/**
2854 * tb_switch_find_by_link_depth() - Find switch by link and depth
2855 * @tb: Domain the switch belongs
2856 * @link: Link number the switch is connected
2857 * @depth: Depth of the switch in link
2858 *
2859 * Returned switch has reference count increased so the caller needs to
2860 * call tb_switch_put() when done with the switch.
2861 */
2862struct tb_switch *tb_switch_find_by_link_depth(struct tb *tb, u8 link, u8 depth)
2863{
2864 struct tb_sw_lookup lookup;
2865 struct device *dev;
2866
2867 memset(&lookup, 0, sizeof(lookup));
2868 lookup.tb = tb;
2869 lookup.link = link;
2870 lookup.depth = depth;
2871
2872 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2873 if (dev)
2874 return tb_to_switch(dev);
2875
2876 return NULL;
2877}
2878
2879/**
Radion Mirchevsky432019d2017-10-04 15:07:40 +03002880 * tb_switch_find_by_uuid() - Find switch by UUID
Mika Westerbergf67cf492017-06-06 15:25:16 +03002881 * @tb: Domain the switch belongs
2882 * @uuid: UUID to look for
2883 *
2884 * Returned switch has reference count increased so the caller needs to
2885 * call tb_switch_put() when done with the switch.
2886 */
Christoph Hellwig7c39ffe2017-07-18 15:30:05 +02002887struct tb_switch *tb_switch_find_by_uuid(struct tb *tb, const uuid_t *uuid)
Mika Westerbergf67cf492017-06-06 15:25:16 +03002888{
2889 struct tb_sw_lookup lookup;
2890 struct device *dev;
2891
2892 memset(&lookup, 0, sizeof(lookup));
2893 lookup.tb = tb;
2894 lookup.uuid = uuid;
2895
2896 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2897 if (dev)
2898 return tb_to_switch(dev);
2899
2900 return NULL;
2901}
Mika Westerberge6b245c2017-06-06 15:25:17 +03002902
Radion Mirchevsky8e9267b2017-10-04 15:24:14 +03002903/**
2904 * tb_switch_find_by_route() - Find switch by route string
2905 * @tb: Domain the switch belongs
2906 * @route: Route string to look for
2907 *
2908 * Returned switch has reference count increased so the caller needs to
2909 * call tb_switch_put() when done with the switch.
2910 */
2911struct tb_switch *tb_switch_find_by_route(struct tb *tb, u64 route)
2912{
2913 struct tb_sw_lookup lookup;
2914 struct device *dev;
2915
2916 if (!route)
2917 return tb_switch_get(tb->root_switch);
2918
2919 memset(&lookup, 0, sizeof(lookup));
2920 lookup.tb = tb;
2921 lookup.route = route;
2922
2923 dev = bus_find_device(&tb_bus_type, NULL, &lookup, tb_switch_match);
2924 if (dev)
2925 return tb_to_switch(dev);
2926
2927 return NULL;
2928}
2929
Mika Westerberg386e5e22019-12-17 15:33:37 +03002930/**
2931 * tb_switch_find_port() - return the first port of @type on @sw or NULL
2932 * @sw: Switch to find the port from
2933 * @type: Port type to look for
2934 */
2935struct tb_port *tb_switch_find_port(struct tb_switch *sw,
2936 enum tb_port_type type)
2937{
2938 struct tb_port *port;
2939
2940 tb_switch_for_each_port(sw, port) {
2941 if (port->config.type == type)
2942 return port;
2943 }
2944
2945 return NULL;
2946}