Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d6cc51cd AN |
2 | /* |
3 | * Thunderbolt Cactus Ridge driver - bus logic (NHI independent) | |
4 | * | |
5 | * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> | |
6 | */ | |
7 | ||
8 | #include <linux/slab.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/delay.h> | |
630b3aff | 11 | #include <linux/platform_data/x86/apple.h> |
d6cc51cd AN |
12 | |
13 | #include "tb.h" | |
7adf6097 | 14 | #include "tb_regs.h" |
3364f0c1 | 15 | #include "tunnel_pci.h" |
d6cc51cd | 16 | |
9d3cce0b MW |
17 | /** |
18 | * struct tb_cm - Simple Thunderbolt connection manager | |
19 | * @tunnel_list: List of active tunnels | |
20 | * @hotplug_active: tb_handle_hotplug will stop progressing plug | |
21 | * events and exit if this is not set (it needs to | |
22 | * acquire the lock one more time). Used to drain wq | |
23 | * after cfg has been paused. | |
24 | */ | |
25 | struct tb_cm { | |
26 | struct list_head tunnel_list; | |
27 | bool hotplug_active; | |
28 | }; | |
9da672a4 AN |
29 | |
30 | /* enumeration & hot plug handling */ | |
31 | ||
32 | ||
33 | static void tb_scan_port(struct tb_port *port); | |
34 | ||
35 | /** | |
36 | * tb_scan_switch() - scan for and initialize downstream switches | |
37 | */ | |
38 | static void tb_scan_switch(struct tb_switch *sw) | |
39 | { | |
40 | int i; | |
41 | for (i = 1; i <= sw->config.max_port_number; i++) | |
42 | tb_scan_port(&sw->ports[i]); | |
43 | } | |
44 | ||
45 | /** | |
46 | * tb_scan_port() - check for and initialize switches below port | |
47 | */ | |
48 | static void tb_scan_port(struct tb_port *port) | |
49 | { | |
50 | struct tb_switch *sw; | |
51 | if (tb_is_upstream_port(port)) | |
52 | return; | |
53 | if (port->config.type != TB_TYPE_PORT) | |
54 | return; | |
343fcb8c AN |
55 | if (port->dual_link_port && port->link_nr) |
56 | return; /* | |
57 | * Downstream switch is reachable through two ports. | |
58 | * Only scan on the primary port (link_nr == 0). | |
59 | */ | |
9da672a4 AN |
60 | if (tb_wait_for_port(port, false) <= 0) |
61 | return; | |
62 | if (port->remote) { | |
63 | tb_port_WARN(port, "port already has a remote!\n"); | |
64 | return; | |
65 | } | |
bfe778ac MW |
66 | sw = tb_switch_alloc(port->sw->tb, &port->sw->dev, |
67 | tb_downstream_route(port)); | |
9da672a4 AN |
68 | if (!sw) |
69 | return; | |
bfe778ac MW |
70 | |
71 | if (tb_switch_configure(sw)) { | |
72 | tb_switch_put(sw); | |
73 | return; | |
74 | } | |
75 | ||
f67cf491 MW |
76 | sw->authorized = true; |
77 | ||
bfe778ac MW |
78 | if (tb_switch_add(sw)) { |
79 | tb_switch_put(sw); | |
80 | return; | |
81 | } | |
82 | ||
9da672a4 AN |
83 | port->remote = tb_upstream_port(sw); |
84 | tb_upstream_port(sw)->remote = port; | |
85 | tb_scan_switch(sw); | |
86 | } | |
87 | ||
3364f0c1 AN |
88 | /** |
89 | * tb_free_invalid_tunnels() - destroy tunnels of devices that have gone away | |
90 | */ | |
91 | static void tb_free_invalid_tunnels(struct tb *tb) | |
92 | { | |
9d3cce0b | 93 | struct tb_cm *tcm = tb_priv(tb); |
3364f0c1 AN |
94 | struct tb_pci_tunnel *tunnel; |
95 | struct tb_pci_tunnel *n; | |
9d3cce0b MW |
96 | |
97 | list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { | |
3364f0c1 AN |
98 | if (tb_pci_is_invalid(tunnel)) { |
99 | tb_pci_deactivate(tunnel); | |
9d3cce0b | 100 | list_del(&tunnel->list); |
3364f0c1 AN |
101 | tb_pci_free(tunnel); |
102 | } | |
103 | } | |
104 | } | |
105 | ||
23dd5bb4 AN |
106 | /** |
107 | * tb_free_unplugged_children() - traverse hierarchy and free unplugged switches | |
108 | */ | |
109 | static void tb_free_unplugged_children(struct tb_switch *sw) | |
110 | { | |
111 | int i; | |
112 | for (i = 1; i <= sw->config.max_port_number; i++) { | |
113 | struct tb_port *port = &sw->ports[i]; | |
114 | if (tb_is_upstream_port(port)) | |
115 | continue; | |
116 | if (!port->remote) | |
117 | continue; | |
118 | if (port->remote->sw->is_unplugged) { | |
bfe778ac | 119 | tb_switch_remove(port->remote->sw); |
23dd5bb4 AN |
120 | port->remote = NULL; |
121 | } else { | |
122 | tb_free_unplugged_children(port->remote->sw); | |
123 | } | |
124 | } | |
125 | } | |
126 | ||
127 | ||
3364f0c1 AN |
128 | /** |
129 | * find_pci_up_port() - return the first PCIe up port on @sw or NULL | |
130 | */ | |
131 | static struct tb_port *tb_find_pci_up_port(struct tb_switch *sw) | |
132 | { | |
133 | int i; | |
134 | for (i = 1; i <= sw->config.max_port_number; i++) | |
135 | if (sw->ports[i].config.type == TB_TYPE_PCIE_UP) | |
136 | return &sw->ports[i]; | |
137 | return NULL; | |
138 | } | |
139 | ||
140 | /** | |
141 | * find_unused_down_port() - return the first inactive PCIe down port on @sw | |
142 | */ | |
143 | static struct tb_port *tb_find_unused_down_port(struct tb_switch *sw) | |
144 | { | |
145 | int i; | |
146 | int cap; | |
147 | int res; | |
148 | int data; | |
149 | for (i = 1; i <= sw->config.max_port_number; i++) { | |
150 | if (tb_is_upstream_port(&sw->ports[i])) | |
151 | continue; | |
152 | if (sw->ports[i].config.type != TB_TYPE_PCIE_DOWN) | |
153 | continue; | |
da2da04b MW |
154 | cap = tb_port_find_cap(&sw->ports[i], TB_PORT_CAP_ADAP); |
155 | if (cap < 0) | |
3364f0c1 AN |
156 | continue; |
157 | res = tb_port_read(&sw->ports[i], &data, TB_CFG_PORT, cap, 1); | |
158 | if (res < 0) | |
159 | continue; | |
160 | if (data & 0x80000000) | |
161 | continue; | |
162 | return &sw->ports[i]; | |
163 | } | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /** | |
168 | * tb_activate_pcie_devices() - scan for and activate PCIe devices | |
169 | * | |
170 | * This method is somewhat ad hoc. For now it only supports one device | |
171 | * per port and only devices at depth 1. | |
172 | */ | |
173 | static void tb_activate_pcie_devices(struct tb *tb) | |
174 | { | |
175 | int i; | |
176 | int cap; | |
177 | u32 data; | |
178 | struct tb_switch *sw; | |
179 | struct tb_port *up_port; | |
180 | struct tb_port *down_port; | |
181 | struct tb_pci_tunnel *tunnel; | |
9d3cce0b MW |
182 | struct tb_cm *tcm = tb_priv(tb); |
183 | ||
3364f0c1 AN |
184 | /* scan for pcie devices at depth 1*/ |
185 | for (i = 1; i <= tb->root_switch->config.max_port_number; i++) { | |
186 | if (tb_is_upstream_port(&tb->root_switch->ports[i])) | |
187 | continue; | |
188 | if (tb->root_switch->ports[i].config.type != TB_TYPE_PORT) | |
189 | continue; | |
190 | if (!tb->root_switch->ports[i].remote) | |
191 | continue; | |
192 | sw = tb->root_switch->ports[i].remote->sw; | |
193 | up_port = tb_find_pci_up_port(sw); | |
194 | if (!up_port) { | |
195 | tb_sw_info(sw, "no PCIe devices found, aborting\n"); | |
196 | continue; | |
197 | } | |
198 | ||
199 | /* check whether port is already activated */ | |
da2da04b MW |
200 | cap = tb_port_find_cap(up_port, TB_PORT_CAP_ADAP); |
201 | if (cap < 0) | |
3364f0c1 AN |
202 | continue; |
203 | if (tb_port_read(up_port, &data, TB_CFG_PORT, cap, 1)) | |
204 | continue; | |
205 | if (data & 0x80000000) { | |
206 | tb_port_info(up_port, | |
207 | "PCIe port already activated, aborting\n"); | |
208 | continue; | |
209 | } | |
210 | ||
211 | down_port = tb_find_unused_down_port(tb->root_switch); | |
212 | if (!down_port) { | |
213 | tb_port_info(up_port, | |
214 | "All PCIe down ports are occupied, aborting\n"); | |
215 | continue; | |
216 | } | |
217 | tunnel = tb_pci_alloc(tb, up_port, down_port); | |
218 | if (!tunnel) { | |
219 | tb_port_info(up_port, | |
220 | "PCIe tunnel allocation failed, aborting\n"); | |
221 | continue; | |
222 | } | |
223 | ||
224 | if (tb_pci_activate(tunnel)) { | |
225 | tb_port_info(up_port, | |
226 | "PCIe tunnel activation failed, aborting\n"); | |
227 | tb_pci_free(tunnel); | |
a2e37343 | 228 | continue; |
3364f0c1 AN |
229 | } |
230 | ||
9d3cce0b | 231 | list_add(&tunnel->list, &tcm->tunnel_list); |
3364f0c1 AN |
232 | } |
233 | } | |
9da672a4 | 234 | |
d6cc51cd AN |
235 | /* hotplug handling */ |
236 | ||
237 | struct tb_hotplug_event { | |
238 | struct work_struct work; | |
239 | struct tb *tb; | |
240 | u64 route; | |
241 | u8 port; | |
242 | bool unplug; | |
243 | }; | |
244 | ||
245 | /** | |
246 | * tb_handle_hotplug() - handle hotplug event | |
247 | * | |
248 | * Executes on tb->wq. | |
249 | */ | |
250 | static void tb_handle_hotplug(struct work_struct *work) | |
251 | { | |
252 | struct tb_hotplug_event *ev = container_of(work, typeof(*ev), work); | |
253 | struct tb *tb = ev->tb; | |
9d3cce0b | 254 | struct tb_cm *tcm = tb_priv(tb); |
053596d9 AN |
255 | struct tb_switch *sw; |
256 | struct tb_port *port; | |
d6cc51cd | 257 | mutex_lock(&tb->lock); |
9d3cce0b | 258 | if (!tcm->hotplug_active) |
d6cc51cd AN |
259 | goto out; /* during init, suspend or shutdown */ |
260 | ||
053596d9 AN |
261 | sw = get_switch_at_route(tb->root_switch, ev->route); |
262 | if (!sw) { | |
263 | tb_warn(tb, | |
264 | "hotplug event from non existent switch %llx:%x (unplug: %d)\n", | |
265 | ev->route, ev->port, ev->unplug); | |
266 | goto out; | |
267 | } | |
268 | if (ev->port > sw->config.max_port_number) { | |
269 | tb_warn(tb, | |
270 | "hotplug event from non existent port %llx:%x (unplug: %d)\n", | |
271 | ev->route, ev->port, ev->unplug); | |
272 | goto out; | |
273 | } | |
274 | port = &sw->ports[ev->port]; | |
275 | if (tb_is_upstream_port(port)) { | |
276 | tb_warn(tb, | |
277 | "hotplug event for upstream port %llx:%x (unplug: %d)\n", | |
278 | ev->route, ev->port, ev->unplug); | |
279 | goto out; | |
280 | } | |
281 | if (ev->unplug) { | |
282 | if (port->remote) { | |
283 | tb_port_info(port, "unplugged\n"); | |
aae20bb6 | 284 | tb_sw_set_unplugged(port->remote->sw); |
3364f0c1 | 285 | tb_free_invalid_tunnels(tb); |
bfe778ac | 286 | tb_switch_remove(port->remote->sw); |
053596d9 AN |
287 | port->remote = NULL; |
288 | } else { | |
289 | tb_port_info(port, | |
290 | "got unplug event for disconnected port, ignoring\n"); | |
291 | } | |
292 | } else if (port->remote) { | |
293 | tb_port_info(port, | |
294 | "got plug event for connected port, ignoring\n"); | |
295 | } else { | |
296 | tb_port_info(port, "hotplug: scanning\n"); | |
297 | tb_scan_port(port); | |
298 | if (!port->remote) { | |
299 | tb_port_info(port, "hotplug: no switch found\n"); | |
300 | } else if (port->remote->sw->config.depth > 1) { | |
301 | tb_sw_warn(port->remote->sw, | |
302 | "hotplug: chaining not supported\n"); | |
3364f0c1 AN |
303 | } else { |
304 | tb_sw_info(port->remote->sw, | |
305 | "hotplug: activating pcie devices\n"); | |
306 | tb_activate_pcie_devices(tb); | |
053596d9 AN |
307 | } |
308 | } | |
d6cc51cd AN |
309 | out: |
310 | mutex_unlock(&tb->lock); | |
311 | kfree(ev); | |
312 | } | |
313 | ||
314 | /** | |
315 | * tb_schedule_hotplug_handler() - callback function for the control channel | |
316 | * | |
317 | * Delegates to tb_handle_hotplug. | |
318 | */ | |
81a54b5e MW |
319 | static void tb_handle_event(struct tb *tb, enum tb_cfg_pkg_type type, |
320 | const void *buf, size_t size) | |
d6cc51cd | 321 | { |
81a54b5e MW |
322 | const struct cfg_event_pkg *pkg = buf; |
323 | struct tb_hotplug_event *ev; | |
324 | u64 route; | |
325 | ||
326 | if (type != TB_CFG_PKG_EVENT) { | |
327 | tb_warn(tb, "unexpected event %#x, ignoring\n", type); | |
328 | return; | |
329 | } | |
330 | ||
331 | route = tb_cfg_get_route(&pkg->header); | |
332 | ||
333 | if (tb_cfg_error(tb->ctl, route, pkg->port, | |
334 | TB_CFG_ERROR_ACK_PLUG_EVENT)) { | |
335 | tb_warn(tb, "could not ack plug event on %llx:%x\n", route, | |
336 | pkg->port); | |
337 | } | |
338 | ||
339 | ev = kmalloc(sizeof(*ev), GFP_KERNEL); | |
d6cc51cd AN |
340 | if (!ev) |
341 | return; | |
342 | INIT_WORK(&ev->work, tb_handle_hotplug); | |
343 | ev->tb = tb; | |
344 | ev->route = route; | |
81a54b5e MW |
345 | ev->port = pkg->port; |
346 | ev->unplug = pkg->unplug; | |
d6cc51cd AN |
347 | queue_work(tb->wq, &ev->work); |
348 | } | |
349 | ||
9d3cce0b | 350 | static void tb_stop(struct tb *tb) |
d6cc51cd | 351 | { |
9d3cce0b | 352 | struct tb_cm *tcm = tb_priv(tb); |
3364f0c1 AN |
353 | struct tb_pci_tunnel *tunnel; |
354 | struct tb_pci_tunnel *n; | |
355 | ||
3364f0c1 | 356 | /* tunnels are only present after everything has been initialized */ |
9d3cce0b | 357 | list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) { |
3364f0c1 AN |
358 | tb_pci_deactivate(tunnel); |
359 | tb_pci_free(tunnel); | |
360 | } | |
bfe778ac | 361 | tb_switch_remove(tb->root_switch); |
9d3cce0b | 362 | tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ |
d6cc51cd AN |
363 | } |
364 | ||
9d3cce0b | 365 | static int tb_start(struct tb *tb) |
d6cc51cd | 366 | { |
9d3cce0b | 367 | struct tb_cm *tcm = tb_priv(tb); |
bfe778ac | 368 | int ret; |
d6cc51cd | 369 | |
bfe778ac | 370 | tb->root_switch = tb_switch_alloc(tb, &tb->dev, 0); |
a25c8b2f | 371 | if (!tb->root_switch) |
9d3cce0b | 372 | return -ENOMEM; |
a25c8b2f | 373 | |
e6b245cc MW |
374 | /* |
375 | * ICM firmware upgrade needs running firmware and in native | |
376 | * mode that is not available so disable firmware upgrade of the | |
377 | * root switch. | |
378 | */ | |
379 | tb->root_switch->no_nvm_upgrade = true; | |
380 | ||
bfe778ac MW |
381 | ret = tb_switch_configure(tb->root_switch); |
382 | if (ret) { | |
383 | tb_switch_put(tb->root_switch); | |
384 | return ret; | |
385 | } | |
386 | ||
387 | /* Announce the switch to the world */ | |
388 | ret = tb_switch_add(tb->root_switch); | |
389 | if (ret) { | |
390 | tb_switch_put(tb->root_switch); | |
391 | return ret; | |
392 | } | |
393 | ||
9da672a4 AN |
394 | /* Full scan to discover devices added before the driver was loaded. */ |
395 | tb_scan_switch(tb->root_switch); | |
3364f0c1 | 396 | tb_activate_pcie_devices(tb); |
9da672a4 | 397 | |
d6cc51cd | 398 | /* Allow tb_handle_hotplug to progress events */ |
9d3cce0b MW |
399 | tcm->hotplug_active = true; |
400 | return 0; | |
d6cc51cd AN |
401 | } |
402 | ||
9d3cce0b | 403 | static int tb_suspend_noirq(struct tb *tb) |
23dd5bb4 | 404 | { |
9d3cce0b MW |
405 | struct tb_cm *tcm = tb_priv(tb); |
406 | ||
daa5140f | 407 | tb_dbg(tb, "suspending...\n"); |
23dd5bb4 | 408 | tb_switch_suspend(tb->root_switch); |
9d3cce0b | 409 | tcm->hotplug_active = false; /* signal tb_handle_hotplug to quit */ |
daa5140f | 410 | tb_dbg(tb, "suspend finished\n"); |
9d3cce0b MW |
411 | |
412 | return 0; | |
23dd5bb4 AN |
413 | } |
414 | ||
9d3cce0b | 415 | static int tb_resume_noirq(struct tb *tb) |
23dd5bb4 | 416 | { |
9d3cce0b | 417 | struct tb_cm *tcm = tb_priv(tb); |
23dd5bb4 | 418 | struct tb_pci_tunnel *tunnel, *n; |
9d3cce0b | 419 | |
daa5140f | 420 | tb_dbg(tb, "resuming...\n"); |
23dd5bb4 AN |
421 | |
422 | /* remove any pci devices the firmware might have setup */ | |
423 | tb_switch_reset(tb, 0); | |
424 | ||
425 | tb_switch_resume(tb->root_switch); | |
426 | tb_free_invalid_tunnels(tb); | |
427 | tb_free_unplugged_children(tb->root_switch); | |
9d3cce0b | 428 | list_for_each_entry_safe(tunnel, n, &tcm->tunnel_list, list) |
23dd5bb4 | 429 | tb_pci_restart(tunnel); |
9d3cce0b | 430 | if (!list_empty(&tcm->tunnel_list)) { |
23dd5bb4 AN |
431 | /* |
432 | * the pcie links need some time to get going. | |
433 | * 100ms works for me... | |
434 | */ | |
daa5140f | 435 | tb_dbg(tb, "tunnels restarted, sleeping for 100ms\n"); |
23dd5bb4 AN |
436 | msleep(100); |
437 | } | |
438 | /* Allow tb_handle_hotplug to progress events */ | |
9d3cce0b | 439 | tcm->hotplug_active = true; |
daa5140f | 440 | tb_dbg(tb, "resume finished\n"); |
9d3cce0b MW |
441 | |
442 | return 0; | |
443 | } | |
444 | ||
445 | static const struct tb_cm_ops tb_cm_ops = { | |
446 | .start = tb_start, | |
447 | .stop = tb_stop, | |
448 | .suspend_noirq = tb_suspend_noirq, | |
449 | .resume_noirq = tb_resume_noirq, | |
81a54b5e | 450 | .handle_event = tb_handle_event, |
9d3cce0b MW |
451 | }; |
452 | ||
453 | struct tb *tb_probe(struct tb_nhi *nhi) | |
454 | { | |
455 | struct tb_cm *tcm; | |
456 | struct tb *tb; | |
457 | ||
630b3aff | 458 | if (!x86_apple_machine) |
f67cf491 MW |
459 | return NULL; |
460 | ||
9d3cce0b MW |
461 | tb = tb_domain_alloc(nhi, sizeof(*tcm)); |
462 | if (!tb) | |
463 | return NULL; | |
464 | ||
f67cf491 | 465 | tb->security_level = TB_SECURITY_NONE; |
9d3cce0b MW |
466 | tb->cm_ops = &tb_cm_ops; |
467 | ||
468 | tcm = tb_priv(tb); | |
469 | INIT_LIST_HEAD(&tcm->tunnel_list); | |
470 | ||
471 | return tb; | |
23dd5bb4 | 472 | } |