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f67cf491 MW |
1 | /* |
2 | * Internal Thunderbolt Connection Manager. This is a firmware running on | |
3 | * the Thunderbolt host controller performing most of the low-level | |
4 | * handling. | |
5 | * | |
6 | * Copyright (C) 2017, Intel Corporation | |
7 | * Authors: Michael Jamet <michael.jamet@intel.com> | |
8 | * Mika Westerberg <mika.westerberg@linux.intel.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU General Public License version 2 as | |
12 | * published by the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | #include <linux/delay.h> | |
16 | #include <linux/dmi.h> | |
17 | #include <linux/mutex.h> | |
18 | #include <linux/pci.h> | |
19 | #include <linux/sizes.h> | |
20 | #include <linux/slab.h> | |
21 | #include <linux/workqueue.h> | |
22 | ||
23 | #include "ctl.h" | |
24 | #include "nhi_regs.h" | |
25 | #include "tb.h" | |
26 | ||
27 | #define PCIE2CIO_CMD 0x30 | |
28 | #define PCIE2CIO_CMD_TIMEOUT BIT(31) | |
29 | #define PCIE2CIO_CMD_START BIT(30) | |
30 | #define PCIE2CIO_CMD_WRITE BIT(21) | |
31 | #define PCIE2CIO_CMD_CS_MASK GENMASK(20, 19) | |
32 | #define PCIE2CIO_CMD_CS_SHIFT 19 | |
33 | #define PCIE2CIO_CMD_PORT_MASK GENMASK(18, 13) | |
34 | #define PCIE2CIO_CMD_PORT_SHIFT 13 | |
35 | ||
36 | #define PCIE2CIO_WRDATA 0x34 | |
37 | #define PCIE2CIO_RDDATA 0x38 | |
38 | ||
39 | #define PHY_PORT_CS1 0x37 | |
40 | #define PHY_PORT_CS1_LINK_DISABLE BIT(14) | |
41 | #define PHY_PORT_CS1_LINK_STATE_MASK GENMASK(29, 26) | |
42 | #define PHY_PORT_CS1_LINK_STATE_SHIFT 26 | |
43 | ||
44 | #define ICM_TIMEOUT 5000 /* ms */ | |
45 | #define ICM_MAX_LINK 4 | |
46 | #define ICM_MAX_DEPTH 6 | |
47 | ||
48 | /** | |
49 | * struct icm - Internal connection manager private data | |
50 | * @request_lock: Makes sure only one message is send to ICM at time | |
51 | * @rescan_work: Work used to rescan the surviving switches after resume | |
52 | * @upstream_port: Pointer to the PCIe upstream port this host | |
53 | * controller is connected. This is only set for systems | |
54 | * where ICM needs to be started manually | |
55 | * @vnd_cap: Vendor defined capability where PCIe2CIO mailbox resides | |
56 | * (only set when @upstream_port is not %NULL) | |
e6b245cc | 57 | * @safe_mode: ICM is in safe mode |
f67cf491 MW |
58 | * @is_supported: Checks if we can support ICM on this controller |
59 | * @get_mode: Read and return the ICM firmware mode (optional) | |
60 | * @get_route: Find a route string for given switch | |
61 | * @device_connected: Handle device connected ICM message | |
62 | * @device_disconnected: Handle device disconnected ICM message | |
63 | */ | |
64 | struct icm { | |
65 | struct mutex request_lock; | |
66 | struct delayed_work rescan_work; | |
67 | struct pci_dev *upstream_port; | |
68 | int vnd_cap; | |
e6b245cc | 69 | bool safe_mode; |
f67cf491 MW |
70 | bool (*is_supported)(struct tb *tb); |
71 | int (*get_mode)(struct tb *tb); | |
72 | int (*get_route)(struct tb *tb, u8 link, u8 depth, u64 *route); | |
73 | void (*device_connected)(struct tb *tb, | |
74 | const struct icm_pkg_header *hdr); | |
75 | void (*device_disconnected)(struct tb *tb, | |
76 | const struct icm_pkg_header *hdr); | |
77 | }; | |
78 | ||
79 | struct icm_notification { | |
80 | struct work_struct work; | |
81 | struct icm_pkg_header *pkg; | |
82 | struct tb *tb; | |
83 | }; | |
84 | ||
85 | static inline struct tb *icm_to_tb(struct icm *icm) | |
86 | { | |
87 | return ((void *)icm - sizeof(struct tb)); | |
88 | } | |
89 | ||
90 | static inline u8 phy_port_from_route(u64 route, u8 depth) | |
91 | { | |
92 | return tb_switch_phy_port_from_link(route >> ((depth - 1) * 8)); | |
93 | } | |
94 | ||
95 | static inline u8 dual_link_from_link(u8 link) | |
96 | { | |
97 | return link ? ((link - 1) ^ 0x01) + 1 : 0; | |
98 | } | |
99 | ||
100 | static inline u64 get_route(u32 route_hi, u32 route_lo) | |
101 | { | |
102 | return (u64)route_hi << 32 | route_lo; | |
103 | } | |
104 | ||
105 | static inline bool is_apple(void) | |
106 | { | |
107 | return dmi_match(DMI_BOARD_VENDOR, "Apple Inc."); | |
108 | } | |
109 | ||
110 | static bool icm_match(const struct tb_cfg_request *req, | |
111 | const struct ctl_pkg *pkg) | |
112 | { | |
113 | const struct icm_pkg_header *res_hdr = pkg->buffer; | |
114 | const struct icm_pkg_header *req_hdr = req->request; | |
115 | ||
116 | if (pkg->frame.eof != req->response_type) | |
117 | return false; | |
118 | if (res_hdr->code != req_hdr->code) | |
119 | return false; | |
120 | ||
121 | return true; | |
122 | } | |
123 | ||
124 | static bool icm_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg) | |
125 | { | |
126 | const struct icm_pkg_header *hdr = pkg->buffer; | |
127 | ||
128 | if (hdr->packet_id < req->npackets) { | |
129 | size_t offset = hdr->packet_id * req->response_size; | |
130 | ||
131 | memcpy(req->response + offset, pkg->buffer, req->response_size); | |
132 | } | |
133 | ||
134 | return hdr->packet_id == hdr->total_packets - 1; | |
135 | } | |
136 | ||
137 | static int icm_request(struct tb *tb, const void *request, size_t request_size, | |
138 | void *response, size_t response_size, size_t npackets, | |
139 | unsigned int timeout_msec) | |
140 | { | |
141 | struct icm *icm = tb_priv(tb); | |
142 | int retries = 3; | |
143 | ||
144 | do { | |
145 | struct tb_cfg_request *req; | |
146 | struct tb_cfg_result res; | |
147 | ||
148 | req = tb_cfg_request_alloc(); | |
149 | if (!req) | |
150 | return -ENOMEM; | |
151 | ||
152 | req->match = icm_match; | |
153 | req->copy = icm_copy; | |
154 | req->request = request; | |
155 | req->request_size = request_size; | |
156 | req->request_type = TB_CFG_PKG_ICM_CMD; | |
157 | req->response = response; | |
158 | req->npackets = npackets; | |
159 | req->response_size = response_size; | |
160 | req->response_type = TB_CFG_PKG_ICM_RESP; | |
161 | ||
162 | mutex_lock(&icm->request_lock); | |
163 | res = tb_cfg_request_sync(tb->ctl, req, timeout_msec); | |
164 | mutex_unlock(&icm->request_lock); | |
165 | ||
166 | tb_cfg_request_put(req); | |
167 | ||
168 | if (res.err != -ETIMEDOUT) | |
169 | return res.err == 1 ? -EIO : res.err; | |
170 | ||
171 | usleep_range(20, 50); | |
172 | } while (retries--); | |
173 | ||
174 | return -ETIMEDOUT; | |
175 | } | |
176 | ||
177 | static bool icm_fr_is_supported(struct tb *tb) | |
178 | { | |
179 | return !is_apple(); | |
180 | } | |
181 | ||
182 | static inline int icm_fr_get_switch_index(u32 port) | |
183 | { | |
184 | int index; | |
185 | ||
186 | if ((port & ICM_PORT_TYPE_MASK) != TB_TYPE_PORT) | |
187 | return 0; | |
188 | ||
189 | index = port >> ICM_PORT_INDEX_SHIFT; | |
190 | return index != 0xff ? index : 0; | |
191 | } | |
192 | ||
193 | static int icm_fr_get_route(struct tb *tb, u8 link, u8 depth, u64 *route) | |
194 | { | |
195 | struct icm_fr_pkg_get_topology_response *switches, *sw; | |
196 | struct icm_fr_pkg_get_topology request = { | |
197 | .hdr = { .code = ICM_GET_TOPOLOGY }, | |
198 | }; | |
199 | size_t npackets = ICM_GET_TOPOLOGY_PACKETS; | |
200 | int ret, index; | |
201 | u8 i; | |
202 | ||
203 | switches = kcalloc(npackets, sizeof(*switches), GFP_KERNEL); | |
204 | if (!switches) | |
205 | return -ENOMEM; | |
206 | ||
207 | ret = icm_request(tb, &request, sizeof(request), switches, | |
208 | sizeof(*switches), npackets, ICM_TIMEOUT); | |
209 | if (ret) | |
210 | goto err_free; | |
211 | ||
212 | sw = &switches[0]; | |
213 | index = icm_fr_get_switch_index(sw->ports[link]); | |
214 | if (!index) { | |
215 | ret = -ENODEV; | |
216 | goto err_free; | |
217 | } | |
218 | ||
219 | sw = &switches[index]; | |
220 | for (i = 1; i < depth; i++) { | |
221 | unsigned int j; | |
222 | ||
223 | if (!(sw->first_data & ICM_SWITCH_USED)) { | |
224 | ret = -ENODEV; | |
225 | goto err_free; | |
226 | } | |
227 | ||
228 | for (j = 0; j < ARRAY_SIZE(sw->ports); j++) { | |
229 | index = icm_fr_get_switch_index(sw->ports[j]); | |
230 | if (index > sw->switch_index) { | |
231 | sw = &switches[index]; | |
232 | break; | |
233 | } | |
234 | } | |
235 | } | |
236 | ||
237 | *route = get_route(sw->route_hi, sw->route_lo); | |
238 | ||
239 | err_free: | |
240 | kfree(switches); | |
241 | return ret; | |
242 | } | |
243 | ||
244 | static int icm_fr_approve_switch(struct tb *tb, struct tb_switch *sw) | |
245 | { | |
246 | struct icm_fr_pkg_approve_device request; | |
247 | struct icm_fr_pkg_approve_device reply; | |
248 | int ret; | |
249 | ||
250 | memset(&request, 0, sizeof(request)); | |
251 | memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid)); | |
252 | request.hdr.code = ICM_APPROVE_DEVICE; | |
253 | request.connection_id = sw->connection_id; | |
254 | request.connection_key = sw->connection_key; | |
255 | ||
256 | memset(&reply, 0, sizeof(reply)); | |
257 | /* Use larger timeout as establishing tunnels can take some time */ | |
258 | ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), | |
259 | 1, 10000); | |
260 | if (ret) | |
261 | return ret; | |
262 | ||
263 | if (reply.hdr.flags & ICM_FLAGS_ERROR) { | |
264 | tb_warn(tb, "PCIe tunnel creation failed\n"); | |
265 | return -EIO; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
271 | static int icm_fr_add_switch_key(struct tb *tb, struct tb_switch *sw) | |
272 | { | |
273 | struct icm_fr_pkg_add_device_key request; | |
274 | struct icm_fr_pkg_add_device_key_response reply; | |
275 | int ret; | |
276 | ||
277 | memset(&request, 0, sizeof(request)); | |
278 | memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid)); | |
279 | request.hdr.code = ICM_ADD_DEVICE_KEY; | |
280 | request.connection_id = sw->connection_id; | |
281 | request.connection_key = sw->connection_key; | |
282 | memcpy(request.key, sw->key, TB_SWITCH_KEY_SIZE); | |
283 | ||
284 | memset(&reply, 0, sizeof(reply)); | |
285 | ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), | |
286 | 1, ICM_TIMEOUT); | |
287 | if (ret) | |
288 | return ret; | |
289 | ||
290 | if (reply.hdr.flags & ICM_FLAGS_ERROR) { | |
291 | tb_warn(tb, "Adding key to switch failed\n"); | |
292 | return -EIO; | |
293 | } | |
294 | ||
295 | return 0; | |
296 | } | |
297 | ||
298 | static int icm_fr_challenge_switch_key(struct tb *tb, struct tb_switch *sw, | |
299 | const u8 *challenge, u8 *response) | |
300 | { | |
301 | struct icm_fr_pkg_challenge_device request; | |
302 | struct icm_fr_pkg_challenge_device_response reply; | |
303 | int ret; | |
304 | ||
305 | memset(&request, 0, sizeof(request)); | |
306 | memcpy(&request.ep_uuid, sw->uuid, sizeof(request.ep_uuid)); | |
307 | request.hdr.code = ICM_CHALLENGE_DEVICE; | |
308 | request.connection_id = sw->connection_id; | |
309 | request.connection_key = sw->connection_key; | |
310 | memcpy(request.challenge, challenge, TB_SWITCH_KEY_SIZE); | |
311 | ||
312 | memset(&reply, 0, sizeof(reply)); | |
313 | ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), | |
314 | 1, ICM_TIMEOUT); | |
315 | if (ret) | |
316 | return ret; | |
317 | ||
318 | if (reply.hdr.flags & ICM_FLAGS_ERROR) | |
319 | return -EKEYREJECTED; | |
320 | if (reply.hdr.flags & ICM_FLAGS_NO_KEY) | |
321 | return -ENOKEY; | |
322 | ||
323 | memcpy(response, reply.response, TB_SWITCH_KEY_SIZE); | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | static void remove_switch(struct tb_switch *sw) | |
329 | { | |
330 | struct tb_switch *parent_sw; | |
331 | ||
332 | parent_sw = tb_to_switch(sw->dev.parent); | |
333 | tb_port_at(tb_route(sw), parent_sw)->remote = NULL; | |
334 | tb_switch_remove(sw); | |
335 | } | |
336 | ||
337 | static void | |
338 | icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr) | |
339 | { | |
340 | const struct icm_fr_event_device_connected *pkg = | |
341 | (const struct icm_fr_event_device_connected *)hdr; | |
342 | struct tb_switch *sw, *parent_sw; | |
343 | struct icm *icm = tb_priv(tb); | |
344 | bool authorized = false; | |
345 | u8 link, depth; | |
346 | u64 route; | |
347 | int ret; | |
348 | ||
349 | link = pkg->link_info & ICM_LINK_INFO_LINK_MASK; | |
350 | depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >> | |
351 | ICM_LINK_INFO_DEPTH_SHIFT; | |
352 | authorized = pkg->link_info & ICM_LINK_INFO_APPROVED; | |
353 | ||
354 | ret = icm->get_route(tb, link, depth, &route); | |
355 | if (ret) { | |
356 | tb_err(tb, "failed to find route string for switch at %u.%u\n", | |
357 | link, depth); | |
358 | return; | |
359 | } | |
360 | ||
361 | sw = tb_switch_find_by_uuid(tb, &pkg->ep_uuid); | |
362 | if (sw) { | |
363 | u8 phy_port, sw_phy_port; | |
364 | ||
365 | parent_sw = tb_to_switch(sw->dev.parent); | |
366 | sw_phy_port = phy_port_from_route(tb_route(sw), sw->depth); | |
367 | phy_port = phy_port_from_route(route, depth); | |
368 | ||
369 | /* | |
370 | * On resume ICM will send us connected events for the | |
371 | * devices that still are present. However, that | |
372 | * information might have changed for example by the | |
373 | * fact that a switch on a dual-link connection might | |
374 | * have been enumerated using the other link now. Make | |
375 | * sure our book keeping matches that. | |
376 | */ | |
377 | if (sw->depth == depth && sw_phy_port == phy_port && | |
378 | !!sw->authorized == authorized) { | |
379 | tb_port_at(tb_route(sw), parent_sw)->remote = NULL; | |
380 | tb_port_at(route, parent_sw)->remote = | |
381 | tb_upstream_port(sw); | |
382 | sw->config.route_hi = upper_32_bits(route); | |
383 | sw->config.route_lo = lower_32_bits(route); | |
384 | sw->connection_id = pkg->connection_id; | |
385 | sw->connection_key = pkg->connection_key; | |
386 | sw->link = link; | |
387 | sw->depth = depth; | |
388 | sw->is_unplugged = false; | |
389 | tb_switch_put(sw); | |
390 | return; | |
391 | } | |
392 | ||
393 | /* | |
394 | * User connected the same switch to another physical | |
395 | * port or to another part of the topology. Remove the | |
396 | * existing switch now before adding the new one. | |
397 | */ | |
398 | remove_switch(sw); | |
399 | tb_switch_put(sw); | |
400 | } | |
401 | ||
402 | /* | |
403 | * If the switch was not found by UUID, look for a switch on | |
404 | * same physical port (taking possible link aggregation into | |
405 | * account) and depth. If we found one it is definitely a stale | |
406 | * one so remove it first. | |
407 | */ | |
408 | sw = tb_switch_find_by_link_depth(tb, link, depth); | |
409 | if (!sw) { | |
410 | u8 dual_link; | |
411 | ||
412 | dual_link = dual_link_from_link(link); | |
413 | if (dual_link) | |
414 | sw = tb_switch_find_by_link_depth(tb, dual_link, depth); | |
415 | } | |
416 | if (sw) { | |
417 | remove_switch(sw); | |
418 | tb_switch_put(sw); | |
419 | } | |
420 | ||
421 | parent_sw = tb_switch_find_by_link_depth(tb, link, depth - 1); | |
422 | if (!parent_sw) { | |
423 | tb_err(tb, "failed to find parent switch for %u.%u\n", | |
424 | link, depth); | |
425 | return; | |
426 | } | |
427 | ||
428 | sw = tb_switch_alloc(tb, &parent_sw->dev, route); | |
429 | if (!sw) { | |
430 | tb_switch_put(parent_sw); | |
431 | return; | |
432 | } | |
433 | ||
434 | sw->uuid = kmemdup(&pkg->ep_uuid, sizeof(pkg->ep_uuid), GFP_KERNEL); | |
435 | sw->connection_id = pkg->connection_id; | |
436 | sw->connection_key = pkg->connection_key; | |
437 | sw->link = link; | |
438 | sw->depth = depth; | |
439 | sw->authorized = authorized; | |
440 | sw->security_level = (pkg->hdr.flags & ICM_FLAGS_SLEVEL_MASK) >> | |
441 | ICM_FLAGS_SLEVEL_SHIFT; | |
442 | ||
443 | /* Link the two switches now */ | |
444 | tb_port_at(route, parent_sw)->remote = tb_upstream_port(sw); | |
445 | tb_upstream_port(sw)->remote = tb_port_at(route, parent_sw); | |
446 | ||
447 | ret = tb_switch_add(sw); | |
448 | if (ret) { | |
449 | tb_port_at(tb_route(sw), parent_sw)->remote = NULL; | |
450 | tb_switch_put(sw); | |
451 | } | |
452 | tb_switch_put(parent_sw); | |
453 | } | |
454 | ||
455 | static void | |
456 | icm_fr_device_disconnected(struct tb *tb, const struct icm_pkg_header *hdr) | |
457 | { | |
458 | const struct icm_fr_event_device_disconnected *pkg = | |
459 | (const struct icm_fr_event_device_disconnected *)hdr; | |
460 | struct tb_switch *sw; | |
461 | u8 link, depth; | |
462 | ||
463 | link = pkg->link_info & ICM_LINK_INFO_LINK_MASK; | |
464 | depth = (pkg->link_info & ICM_LINK_INFO_DEPTH_MASK) >> | |
465 | ICM_LINK_INFO_DEPTH_SHIFT; | |
466 | ||
467 | if (link > ICM_MAX_LINK || depth > ICM_MAX_DEPTH) { | |
468 | tb_warn(tb, "invalid topology %u.%u, ignoring\n", link, depth); | |
469 | return; | |
470 | } | |
471 | ||
472 | sw = tb_switch_find_by_link_depth(tb, link, depth); | |
473 | if (!sw) { | |
474 | tb_warn(tb, "no switch exists at %u.%u, ignoring\n", link, | |
475 | depth); | |
476 | return; | |
477 | } | |
478 | ||
479 | remove_switch(sw); | |
480 | tb_switch_put(sw); | |
481 | } | |
482 | ||
483 | static struct pci_dev *get_upstream_port(struct pci_dev *pdev) | |
484 | { | |
485 | struct pci_dev *parent; | |
486 | ||
487 | parent = pci_upstream_bridge(pdev); | |
488 | while (parent) { | |
489 | if (!pci_is_pcie(parent)) | |
490 | return NULL; | |
491 | if (pci_pcie_type(parent) == PCI_EXP_TYPE_UPSTREAM) | |
492 | break; | |
493 | parent = pci_upstream_bridge(parent); | |
494 | } | |
495 | ||
496 | if (!parent) | |
497 | return NULL; | |
498 | ||
499 | switch (parent->device) { | |
500 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_BRIDGE: | |
501 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_BRIDGE: | |
502 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_BRIDGE: | |
503 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_BRIDGE: | |
504 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_BRIDGE: | |
505 | return parent; | |
506 | } | |
507 | ||
508 | return NULL; | |
509 | } | |
510 | ||
511 | static bool icm_ar_is_supported(struct tb *tb) | |
512 | { | |
513 | struct pci_dev *upstream_port; | |
514 | struct icm *icm = tb_priv(tb); | |
515 | ||
516 | /* | |
517 | * Starting from Alpine Ridge we can use ICM on Apple machines | |
518 | * as well. We just need to reset and re-enable it first. | |
519 | */ | |
520 | if (!is_apple()) | |
521 | return true; | |
522 | ||
523 | /* | |
524 | * Find the upstream PCIe port in case we need to do reset | |
525 | * through its vendor specific registers. | |
526 | */ | |
527 | upstream_port = get_upstream_port(tb->nhi->pdev); | |
528 | if (upstream_port) { | |
529 | int cap; | |
530 | ||
531 | cap = pci_find_ext_capability(upstream_port, | |
532 | PCI_EXT_CAP_ID_VNDR); | |
533 | if (cap > 0) { | |
534 | icm->upstream_port = upstream_port; | |
535 | icm->vnd_cap = cap; | |
536 | ||
537 | return true; | |
538 | } | |
539 | } | |
540 | ||
541 | return false; | |
542 | } | |
543 | ||
544 | static int icm_ar_get_mode(struct tb *tb) | |
545 | { | |
546 | struct tb_nhi *nhi = tb->nhi; | |
547 | int retries = 5; | |
548 | u32 val; | |
549 | ||
550 | do { | |
551 | val = ioread32(nhi->iobase + REG_FW_STS); | |
552 | if (val & REG_FW_STS_NVM_AUTH_DONE) | |
553 | break; | |
554 | msleep(30); | |
555 | } while (--retries); | |
556 | ||
557 | if (!retries) { | |
558 | dev_err(&nhi->pdev->dev, "ICM firmware not authenticated\n"); | |
559 | return -ENODEV; | |
560 | } | |
561 | ||
562 | return nhi_mailbox_mode(nhi); | |
563 | } | |
564 | ||
565 | static int icm_ar_get_route(struct tb *tb, u8 link, u8 depth, u64 *route) | |
566 | { | |
567 | struct icm_ar_pkg_get_route_response reply; | |
568 | struct icm_ar_pkg_get_route request = { | |
569 | .hdr = { .code = ICM_GET_ROUTE }, | |
570 | .link_info = depth << ICM_LINK_INFO_DEPTH_SHIFT | link, | |
571 | }; | |
572 | int ret; | |
573 | ||
574 | memset(&reply, 0, sizeof(reply)); | |
575 | ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), | |
576 | 1, ICM_TIMEOUT); | |
577 | if (ret) | |
578 | return ret; | |
579 | ||
580 | if (reply.hdr.flags & ICM_FLAGS_ERROR) | |
581 | return -EIO; | |
582 | ||
583 | *route = get_route(reply.route_hi, reply.route_lo); | |
584 | return 0; | |
585 | } | |
586 | ||
587 | static void icm_handle_notification(struct work_struct *work) | |
588 | { | |
589 | struct icm_notification *n = container_of(work, typeof(*n), work); | |
590 | struct tb *tb = n->tb; | |
591 | struct icm *icm = tb_priv(tb); | |
592 | ||
593 | mutex_lock(&tb->lock); | |
594 | ||
595 | switch (n->pkg->code) { | |
596 | case ICM_EVENT_DEVICE_CONNECTED: | |
597 | icm->device_connected(tb, n->pkg); | |
598 | break; | |
599 | case ICM_EVENT_DEVICE_DISCONNECTED: | |
600 | icm->device_disconnected(tb, n->pkg); | |
601 | break; | |
602 | } | |
603 | ||
604 | mutex_unlock(&tb->lock); | |
605 | ||
606 | kfree(n->pkg); | |
607 | kfree(n); | |
608 | } | |
609 | ||
610 | static void icm_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, | |
611 | const void *buf, size_t size) | |
612 | { | |
613 | struct icm_notification *n; | |
614 | ||
615 | n = kmalloc(sizeof(*n), GFP_KERNEL); | |
616 | if (!n) | |
617 | return; | |
618 | ||
619 | INIT_WORK(&n->work, icm_handle_notification); | |
620 | n->pkg = kmemdup(buf, size, GFP_KERNEL); | |
621 | n->tb = tb; | |
622 | ||
623 | queue_work(tb->wq, &n->work); | |
624 | } | |
625 | ||
626 | static int | |
627 | __icm_driver_ready(struct tb *tb, enum tb_security_level *security_level) | |
628 | { | |
629 | struct icm_pkg_driver_ready_response reply; | |
630 | struct icm_pkg_driver_ready request = { | |
631 | .hdr.code = ICM_DRIVER_READY, | |
632 | }; | |
633 | unsigned int retries = 10; | |
634 | int ret; | |
635 | ||
636 | memset(&reply, 0, sizeof(reply)); | |
637 | ret = icm_request(tb, &request, sizeof(request), &reply, sizeof(reply), | |
638 | 1, ICM_TIMEOUT); | |
639 | if (ret) | |
640 | return ret; | |
641 | ||
642 | if (security_level) | |
643 | *security_level = reply.security_level & 0xf; | |
644 | ||
645 | /* | |
646 | * Hold on here until the switch config space is accessible so | |
647 | * that we can read root switch config successfully. | |
648 | */ | |
649 | do { | |
650 | struct tb_cfg_result res; | |
651 | u32 tmp; | |
652 | ||
653 | res = tb_cfg_read_raw(tb->ctl, &tmp, 0, 0, TB_CFG_SWITCH, | |
654 | 0, 1, 100); | |
655 | if (!res.err) | |
656 | return 0; | |
657 | ||
658 | msleep(50); | |
659 | } while (--retries); | |
660 | ||
661 | return -ETIMEDOUT; | |
662 | } | |
663 | ||
664 | static int pci2cio_wait_completion(struct icm *icm, unsigned long timeout_msec) | |
665 | { | |
666 | unsigned long end = jiffies + msecs_to_jiffies(timeout_msec); | |
667 | u32 cmd; | |
668 | ||
669 | do { | |
670 | pci_read_config_dword(icm->upstream_port, | |
671 | icm->vnd_cap + PCIE2CIO_CMD, &cmd); | |
672 | if (!(cmd & PCIE2CIO_CMD_START)) { | |
673 | if (cmd & PCIE2CIO_CMD_TIMEOUT) | |
674 | break; | |
675 | return 0; | |
676 | } | |
677 | ||
678 | msleep(50); | |
679 | } while (time_before(jiffies, end)); | |
680 | ||
681 | return -ETIMEDOUT; | |
682 | } | |
683 | ||
684 | static int pcie2cio_read(struct icm *icm, enum tb_cfg_space cs, | |
685 | unsigned int port, unsigned int index, u32 *data) | |
686 | { | |
687 | struct pci_dev *pdev = icm->upstream_port; | |
688 | int ret, vnd_cap = icm->vnd_cap; | |
689 | u32 cmd; | |
690 | ||
691 | cmd = index; | |
692 | cmd |= (port << PCIE2CIO_CMD_PORT_SHIFT) & PCIE2CIO_CMD_PORT_MASK; | |
693 | cmd |= (cs << PCIE2CIO_CMD_CS_SHIFT) & PCIE2CIO_CMD_CS_MASK; | |
694 | cmd |= PCIE2CIO_CMD_START; | |
695 | pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_CMD, cmd); | |
696 | ||
697 | ret = pci2cio_wait_completion(icm, 5000); | |
698 | if (ret) | |
699 | return ret; | |
700 | ||
701 | pci_read_config_dword(pdev, vnd_cap + PCIE2CIO_RDDATA, data); | |
702 | return 0; | |
703 | } | |
704 | ||
705 | static int pcie2cio_write(struct icm *icm, enum tb_cfg_space cs, | |
706 | unsigned int port, unsigned int index, u32 data) | |
707 | { | |
708 | struct pci_dev *pdev = icm->upstream_port; | |
709 | int vnd_cap = icm->vnd_cap; | |
710 | u32 cmd; | |
711 | ||
712 | pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_WRDATA, data); | |
713 | ||
714 | cmd = index; | |
715 | cmd |= (port << PCIE2CIO_CMD_PORT_SHIFT) & PCIE2CIO_CMD_PORT_MASK; | |
716 | cmd |= (cs << PCIE2CIO_CMD_CS_SHIFT) & PCIE2CIO_CMD_CS_MASK; | |
717 | cmd |= PCIE2CIO_CMD_WRITE | PCIE2CIO_CMD_START; | |
718 | pci_write_config_dword(pdev, vnd_cap + PCIE2CIO_CMD, cmd); | |
719 | ||
720 | return pci2cio_wait_completion(icm, 5000); | |
721 | } | |
722 | ||
723 | static int icm_firmware_reset(struct tb *tb, struct tb_nhi *nhi) | |
724 | { | |
725 | struct icm *icm = tb_priv(tb); | |
726 | u32 val; | |
727 | ||
728 | /* Put ARC to wait for CIO reset event to happen */ | |
729 | val = ioread32(nhi->iobase + REG_FW_STS); | |
730 | val |= REG_FW_STS_CIO_RESET_REQ; | |
731 | iowrite32(val, nhi->iobase + REG_FW_STS); | |
732 | ||
733 | /* Re-start ARC */ | |
734 | val = ioread32(nhi->iobase + REG_FW_STS); | |
735 | val |= REG_FW_STS_ICM_EN_INVERT; | |
736 | val |= REG_FW_STS_ICM_EN_CPU; | |
737 | iowrite32(val, nhi->iobase + REG_FW_STS); | |
738 | ||
739 | /* Trigger CIO reset now */ | |
740 | return pcie2cio_write(icm, TB_CFG_SWITCH, 0, 0x50, BIT(9)); | |
741 | } | |
742 | ||
743 | static int icm_firmware_start(struct tb *tb, struct tb_nhi *nhi) | |
744 | { | |
745 | unsigned int retries = 10; | |
746 | int ret; | |
747 | u32 val; | |
748 | ||
749 | /* Check if the ICM firmware is already running */ | |
750 | val = ioread32(nhi->iobase + REG_FW_STS); | |
751 | if (val & REG_FW_STS_ICM_EN) | |
752 | return 0; | |
753 | ||
754 | dev_info(&nhi->pdev->dev, "starting ICM firmware\n"); | |
755 | ||
756 | ret = icm_firmware_reset(tb, nhi); | |
757 | if (ret) | |
758 | return ret; | |
759 | ||
760 | /* Wait until the ICM firmware tells us it is up and running */ | |
761 | do { | |
762 | /* Check that the ICM firmware is running */ | |
763 | val = ioread32(nhi->iobase + REG_FW_STS); | |
764 | if (val & REG_FW_STS_NVM_AUTH_DONE) | |
765 | return 0; | |
766 | ||
767 | msleep(300); | |
768 | } while (--retries); | |
769 | ||
770 | return -ETIMEDOUT; | |
771 | } | |
772 | ||
773 | static int icm_reset_phy_port(struct tb *tb, int phy_port) | |
774 | { | |
775 | struct icm *icm = tb_priv(tb); | |
776 | u32 state0, state1; | |
777 | int port0, port1; | |
778 | u32 val0, val1; | |
779 | int ret; | |
780 | ||
781 | if (!icm->upstream_port) | |
782 | return 0; | |
783 | ||
784 | if (phy_port) { | |
785 | port0 = 3; | |
786 | port1 = 4; | |
787 | } else { | |
788 | port0 = 1; | |
789 | port1 = 2; | |
790 | } | |
791 | ||
792 | /* | |
793 | * Read link status of both null ports belonging to a single | |
794 | * physical port. | |
795 | */ | |
796 | ret = pcie2cio_read(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, &val0); | |
797 | if (ret) | |
798 | return ret; | |
799 | ret = pcie2cio_read(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, &val1); | |
800 | if (ret) | |
801 | return ret; | |
802 | ||
803 | state0 = val0 & PHY_PORT_CS1_LINK_STATE_MASK; | |
804 | state0 >>= PHY_PORT_CS1_LINK_STATE_SHIFT; | |
805 | state1 = val1 & PHY_PORT_CS1_LINK_STATE_MASK; | |
806 | state1 >>= PHY_PORT_CS1_LINK_STATE_SHIFT; | |
807 | ||
808 | /* If they are both up we need to reset them now */ | |
809 | if (state0 != TB_PORT_UP || state1 != TB_PORT_UP) | |
810 | return 0; | |
811 | ||
812 | val0 |= PHY_PORT_CS1_LINK_DISABLE; | |
813 | ret = pcie2cio_write(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, val0); | |
814 | if (ret) | |
815 | return ret; | |
816 | ||
817 | val1 |= PHY_PORT_CS1_LINK_DISABLE; | |
818 | ret = pcie2cio_write(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, val1); | |
819 | if (ret) | |
820 | return ret; | |
821 | ||
822 | /* Wait a bit and then re-enable both ports */ | |
823 | usleep_range(10, 100); | |
824 | ||
825 | ret = pcie2cio_read(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, &val0); | |
826 | if (ret) | |
827 | return ret; | |
828 | ret = pcie2cio_read(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, &val1); | |
829 | if (ret) | |
830 | return ret; | |
831 | ||
832 | val0 &= ~PHY_PORT_CS1_LINK_DISABLE; | |
833 | ret = pcie2cio_write(icm, TB_CFG_PORT, port0, PHY_PORT_CS1, val0); | |
834 | if (ret) | |
835 | return ret; | |
836 | ||
837 | val1 &= ~PHY_PORT_CS1_LINK_DISABLE; | |
838 | return pcie2cio_write(icm, TB_CFG_PORT, port1, PHY_PORT_CS1, val1); | |
839 | } | |
840 | ||
841 | static int icm_firmware_init(struct tb *tb) | |
842 | { | |
843 | struct icm *icm = tb_priv(tb); | |
844 | struct tb_nhi *nhi = tb->nhi; | |
845 | int ret; | |
846 | ||
847 | ret = icm_firmware_start(tb, nhi); | |
848 | if (ret) { | |
849 | dev_err(&nhi->pdev->dev, "could not start ICM firmware\n"); | |
850 | return ret; | |
851 | } | |
852 | ||
853 | if (icm->get_mode) { | |
854 | ret = icm->get_mode(tb); | |
855 | ||
856 | switch (ret) { | |
e6b245cc MW |
857 | case NHI_FW_SAFE_MODE: |
858 | icm->safe_mode = true; | |
859 | break; | |
860 | ||
f67cf491 MW |
861 | case NHI_FW_CM_MODE: |
862 | /* Ask ICM to accept all Thunderbolt devices */ | |
863 | nhi_mailbox_cmd(nhi, NHI_MAILBOX_ALLOW_ALL_DEVS, 0); | |
864 | break; | |
865 | ||
866 | default: | |
867 | tb_err(tb, "ICM firmware is in wrong mode: %u\n", ret); | |
868 | return -ENODEV; | |
869 | } | |
870 | } | |
871 | ||
872 | /* | |
873 | * Reset both physical ports if there is anything connected to | |
874 | * them already. | |
875 | */ | |
876 | ret = icm_reset_phy_port(tb, 0); | |
877 | if (ret) | |
878 | dev_warn(&nhi->pdev->dev, "failed to reset links on port0\n"); | |
879 | ret = icm_reset_phy_port(tb, 1); | |
880 | if (ret) | |
881 | dev_warn(&nhi->pdev->dev, "failed to reset links on port1\n"); | |
882 | ||
883 | return 0; | |
884 | } | |
885 | ||
886 | static int icm_driver_ready(struct tb *tb) | |
887 | { | |
e6b245cc | 888 | struct icm *icm = tb_priv(tb); |
f67cf491 MW |
889 | int ret; |
890 | ||
891 | ret = icm_firmware_init(tb); | |
892 | if (ret) | |
893 | return ret; | |
894 | ||
e6b245cc MW |
895 | if (icm->safe_mode) { |
896 | tb_info(tb, "Thunderbolt host controller is in safe mode.\n"); | |
897 | tb_info(tb, "You need to update NVM firmware of the controller before it can be used.\n"); | |
898 | tb_info(tb, "For latest updates check https://thunderbolttechnology.net/updates.\n"); | |
899 | return 0; | |
900 | } | |
901 | ||
f67cf491 MW |
902 | return __icm_driver_ready(tb, &tb->security_level); |
903 | } | |
904 | ||
905 | static int icm_suspend(struct tb *tb) | |
906 | { | |
907 | return nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_SAVE_DEVS, 0); | |
908 | } | |
909 | ||
910 | /* | |
911 | * Mark all switches (except root switch) below this one unplugged. ICM | |
912 | * firmware will send us an updated list of switches after we have send | |
913 | * it driver ready command. If a switch is not in that list it will be | |
914 | * removed when we perform rescan. | |
915 | */ | |
916 | static void icm_unplug_children(struct tb_switch *sw) | |
917 | { | |
918 | unsigned int i; | |
919 | ||
920 | if (tb_route(sw)) | |
921 | sw->is_unplugged = true; | |
922 | ||
923 | for (i = 1; i <= sw->config.max_port_number; i++) { | |
924 | struct tb_port *port = &sw->ports[i]; | |
925 | ||
926 | if (tb_is_upstream_port(port)) | |
927 | continue; | |
928 | if (!port->remote) | |
929 | continue; | |
930 | ||
931 | icm_unplug_children(port->remote->sw); | |
932 | } | |
933 | } | |
934 | ||
935 | static void icm_free_unplugged_children(struct tb_switch *sw) | |
936 | { | |
937 | unsigned int i; | |
938 | ||
939 | for (i = 1; i <= sw->config.max_port_number; i++) { | |
940 | struct tb_port *port = &sw->ports[i]; | |
941 | ||
942 | if (tb_is_upstream_port(port)) | |
943 | continue; | |
944 | if (!port->remote) | |
945 | continue; | |
946 | ||
947 | if (port->remote->sw->is_unplugged) { | |
948 | tb_switch_remove(port->remote->sw); | |
949 | port->remote = NULL; | |
950 | } else { | |
951 | icm_free_unplugged_children(port->remote->sw); | |
952 | } | |
953 | } | |
954 | } | |
955 | ||
956 | static void icm_rescan_work(struct work_struct *work) | |
957 | { | |
958 | struct icm *icm = container_of(work, struct icm, rescan_work.work); | |
959 | struct tb *tb = icm_to_tb(icm); | |
960 | ||
961 | mutex_lock(&tb->lock); | |
962 | if (tb->root_switch) | |
963 | icm_free_unplugged_children(tb->root_switch); | |
964 | mutex_unlock(&tb->lock); | |
965 | } | |
966 | ||
967 | static void icm_complete(struct tb *tb) | |
968 | { | |
969 | struct icm *icm = tb_priv(tb); | |
970 | ||
971 | if (tb->nhi->going_away) | |
972 | return; | |
973 | ||
974 | icm_unplug_children(tb->root_switch); | |
975 | ||
976 | /* | |
977 | * Now all existing children should be resumed, start events | |
978 | * from ICM to get updated status. | |
979 | */ | |
980 | __icm_driver_ready(tb, NULL); | |
981 | ||
982 | /* | |
983 | * We do not get notifications of devices that have been | |
984 | * unplugged during suspend so schedule rescan to clean them up | |
985 | * if any. | |
986 | */ | |
987 | queue_delayed_work(tb->wq, &icm->rescan_work, msecs_to_jiffies(500)); | |
988 | } | |
989 | ||
990 | static int icm_start(struct tb *tb) | |
991 | { | |
e6b245cc | 992 | struct icm *icm = tb_priv(tb); |
f67cf491 MW |
993 | int ret; |
994 | ||
e6b245cc MW |
995 | if (icm->safe_mode) |
996 | tb->root_switch = tb_switch_alloc_safe_mode(tb, &tb->dev, 0); | |
997 | else | |
998 | tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); | |
f67cf491 MW |
999 | if (!tb->root_switch) |
1000 | return -ENODEV; | |
1001 | ||
e6b245cc MW |
1002 | /* |
1003 | * NVM upgrade has not been tested on Apple systems and they | |
1004 | * don't provide images publicly either. To be on the safe side | |
1005 | * prevent root switch NVM upgrade on Macs for now. | |
1006 | */ | |
1007 | tb->root_switch->no_nvm_upgrade = is_apple(); | |
1008 | ||
f67cf491 MW |
1009 | ret = tb_switch_add(tb->root_switch); |
1010 | if (ret) | |
1011 | tb_switch_put(tb->root_switch); | |
1012 | ||
1013 | return ret; | |
1014 | } | |
1015 | ||
1016 | static void icm_stop(struct tb *tb) | |
1017 | { | |
1018 | struct icm *icm = tb_priv(tb); | |
1019 | ||
1020 | cancel_delayed_work(&icm->rescan_work); | |
1021 | tb_switch_remove(tb->root_switch); | |
1022 | tb->root_switch = NULL; | |
1023 | nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DRV_UNLOADS, 0); | |
1024 | } | |
1025 | ||
e6b245cc MW |
1026 | static int icm_disconnect_pcie_paths(struct tb *tb) |
1027 | { | |
1028 | return nhi_mailbox_cmd(tb->nhi, NHI_MAILBOX_DISCONNECT_PCIE_PATHS, 0); | |
1029 | } | |
1030 | ||
f67cf491 MW |
1031 | /* Falcon Ridge and Alpine Ridge */ |
1032 | static const struct tb_cm_ops icm_fr_ops = { | |
1033 | .driver_ready = icm_driver_ready, | |
1034 | .start = icm_start, | |
1035 | .stop = icm_stop, | |
1036 | .suspend = icm_suspend, | |
1037 | .complete = icm_complete, | |
1038 | .handle_event = icm_handle_event, | |
1039 | .approve_switch = icm_fr_approve_switch, | |
1040 | .add_switch_key = icm_fr_add_switch_key, | |
1041 | .challenge_switch_key = icm_fr_challenge_switch_key, | |
e6b245cc | 1042 | .disconnect_pcie_paths = icm_disconnect_pcie_paths, |
f67cf491 MW |
1043 | }; |
1044 | ||
1045 | struct tb *icm_probe(struct tb_nhi *nhi) | |
1046 | { | |
1047 | struct icm *icm; | |
1048 | struct tb *tb; | |
1049 | ||
1050 | tb = tb_domain_alloc(nhi, sizeof(struct icm)); | |
1051 | if (!tb) | |
1052 | return NULL; | |
1053 | ||
1054 | icm = tb_priv(tb); | |
1055 | INIT_DELAYED_WORK(&icm->rescan_work, icm_rescan_work); | |
1056 | mutex_init(&icm->request_lock); | |
1057 | ||
1058 | switch (nhi->pdev->device) { | |
1059 | case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_2C_NHI: | |
1060 | case PCI_DEVICE_ID_INTEL_FALCON_RIDGE_4C_NHI: | |
1061 | icm->is_supported = icm_fr_is_supported; | |
1062 | icm->get_route = icm_fr_get_route; | |
1063 | icm->device_connected = icm_fr_device_connected; | |
1064 | icm->device_disconnected = icm_fr_device_disconnected; | |
1065 | tb->cm_ops = &icm_fr_ops; | |
1066 | break; | |
1067 | ||
1068 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_2C_NHI: | |
1069 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_4C_NHI: | |
1070 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_LP_NHI: | |
1071 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_4C_NHI: | |
1072 | case PCI_DEVICE_ID_INTEL_ALPINE_RIDGE_C_2C_NHI: | |
1073 | icm->is_supported = icm_ar_is_supported; | |
1074 | icm->get_mode = icm_ar_get_mode; | |
1075 | icm->get_route = icm_ar_get_route; | |
1076 | icm->device_connected = icm_fr_device_connected; | |
1077 | icm->device_disconnected = icm_fr_device_disconnected; | |
1078 | tb->cm_ops = &icm_fr_ops; | |
1079 | break; | |
1080 | } | |
1081 | ||
1082 | if (!icm->is_supported || !icm->is_supported(tb)) { | |
1083 | dev_dbg(&nhi->pdev->dev, "ICM not supported on this controller\n"); | |
1084 | tb_domain_put(tb); | |
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | return tb; | |
1089 | } |