Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f25bf6fc | 2 | /* |
15c6784c | 3 | * Thunderbolt driver - control channel and configuration commands |
f25bf6fc AN |
4 | * |
5 | * Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com> | |
15c6784c | 6 | * Copyright (C) 2018, Intel Corporation |
f25bf6fc AN |
7 | */ |
8 | ||
9 | #include <linux/crc32.h> | |
d7f781bf | 10 | #include <linux/delay.h> |
f25bf6fc AN |
11 | #include <linux/slab.h> |
12 | #include <linux/pci.h> | |
13 | #include <linux/dmapool.h> | |
14 | #include <linux/workqueue.h> | |
f25bf6fc AN |
15 | |
16 | #include "ctl.h" | |
17 | ||
a0c45b0b GF |
18 | #define CREATE_TRACE_POINTS |
19 | #include "trace.h" | |
f25bf6fc | 20 | |
d7f781bf | 21 | #define TB_CTL_RX_PKG_COUNT 10 |
641cdbea | 22 | #define TB_CTL_RETRIES 4 |
f25bf6fc AN |
23 | |
24 | /** | |
9c3db0b7 MW |
25 | * struct tb_ctl - Thunderbolt control channel |
26 | * @nhi: Pointer to the NHI structure | |
27 | * @tx: Transmit ring | |
28 | * @rx: Receive ring | |
29 | * @frame_pool: DMA pool for control messages | |
30 | * @rx_packets: Received control messages | |
31 | * @request_queue_lock: Lock protecting @request_queue | |
32 | * @request_queue: List of outstanding requests | |
33 | * @running: Is the control channel running at the moment | |
7f0a34d7 | 34 | * @timeout_msec: Default timeout for non-raw control messages |
9c3db0b7 MW |
35 | * @callback: Callback called when hotplug message is received |
36 | * @callback_data: Data passed to @callback | |
a0c45b0b | 37 | * @index: Domain number. This will be output with the trace record. |
f25bf6fc AN |
38 | */ |
39 | struct tb_ctl { | |
40 | struct tb_nhi *nhi; | |
41 | struct tb_ring *tx; | |
42 | struct tb_ring *rx; | |
43 | ||
44 | struct dma_pool *frame_pool; | |
45 | struct ctl_pkg *rx_packets[TB_CTL_RX_PKG_COUNT]; | |
d7f781bf MW |
46 | struct mutex request_queue_lock; |
47 | struct list_head request_queue; | |
48 | bool running; | |
f25bf6fc | 49 | |
7f0a34d7 | 50 | int timeout_msec; |
81a54b5e | 51 | event_cb callback; |
f25bf6fc | 52 | void *callback_data; |
a0c45b0b GF |
53 | |
54 | int index; | |
f25bf6fc AN |
55 | }; |
56 | ||
57 | ||
58 | #define tb_ctl_WARN(ctl, format, arg...) \ | |
59 | dev_WARN(&(ctl)->nhi->pdev->dev, format, ## arg) | |
60 | ||
61 | #define tb_ctl_err(ctl, format, arg...) \ | |
62 | dev_err(&(ctl)->nhi->pdev->dev, format, ## arg) | |
63 | ||
64 | #define tb_ctl_warn(ctl, format, arg...) \ | |
65 | dev_warn(&(ctl)->nhi->pdev->dev, format, ## arg) | |
66 | ||
67 | #define tb_ctl_info(ctl, format, arg...) \ | |
68 | dev_info(&(ctl)->nhi->pdev->dev, format, ## arg) | |
69 | ||
81a54b5e MW |
70 | #define tb_ctl_dbg(ctl, format, arg...) \ |
71 | dev_dbg(&(ctl)->nhi->pdev->dev, format, ## arg) | |
72 | ||
d7f781bf MW |
73 | static DECLARE_WAIT_QUEUE_HEAD(tb_cfg_request_cancel_queue); |
74 | /* Serializes access to request kref_get/put */ | |
75 | static DEFINE_MUTEX(tb_cfg_request_lock); | |
76 | ||
77 | /** | |
78 | * tb_cfg_request_alloc() - Allocates a new config request | |
79 | * | |
80 | * This is refcounted object so when you are done with this, call | |
81 | * tb_cfg_request_put() to it. | |
82 | */ | |
83 | struct tb_cfg_request *tb_cfg_request_alloc(void) | |
84 | { | |
85 | struct tb_cfg_request *req; | |
86 | ||
87 | req = kzalloc(sizeof(*req), GFP_KERNEL); | |
88 | if (!req) | |
89 | return NULL; | |
90 | ||
91 | kref_init(&req->kref); | |
92 | ||
93 | return req; | |
94 | } | |
95 | ||
96 | /** | |
97 | * tb_cfg_request_get() - Increase refcount of a request | |
98 | * @req: Request whose refcount is increased | |
99 | */ | |
100 | void tb_cfg_request_get(struct tb_cfg_request *req) | |
101 | { | |
102 | mutex_lock(&tb_cfg_request_lock); | |
103 | kref_get(&req->kref); | |
104 | mutex_unlock(&tb_cfg_request_lock); | |
105 | } | |
106 | ||
107 | static void tb_cfg_request_destroy(struct kref *kref) | |
108 | { | |
109 | struct tb_cfg_request *req = container_of(kref, typeof(*req), kref); | |
110 | ||
111 | kfree(req); | |
112 | } | |
113 | ||
114 | /** | |
115 | * tb_cfg_request_put() - Decrease refcount and possibly release the request | |
116 | * @req: Request whose refcount is decreased | |
117 | * | |
118 | * Call this function when you are done with the request. When refcount | |
119 | * goes to %0 the object is released. | |
120 | */ | |
121 | void tb_cfg_request_put(struct tb_cfg_request *req) | |
122 | { | |
123 | mutex_lock(&tb_cfg_request_lock); | |
124 | kref_put(&req->kref, tb_cfg_request_destroy); | |
125 | mutex_unlock(&tb_cfg_request_lock); | |
126 | } | |
127 | ||
128 | static int tb_cfg_request_enqueue(struct tb_ctl *ctl, | |
129 | struct tb_cfg_request *req) | |
130 | { | |
131 | WARN_ON(test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags)); | |
132 | WARN_ON(req->ctl); | |
133 | ||
134 | mutex_lock(&ctl->request_queue_lock); | |
135 | if (!ctl->running) { | |
136 | mutex_unlock(&ctl->request_queue_lock); | |
137 | return -ENOTCONN; | |
138 | } | |
139 | req->ctl = ctl; | |
140 | list_add_tail(&req->list, &ctl->request_queue); | |
141 | set_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); | |
142 | mutex_unlock(&ctl->request_queue_lock); | |
143 | return 0; | |
144 | } | |
145 | ||
146 | static void tb_cfg_request_dequeue(struct tb_cfg_request *req) | |
147 | { | |
148 | struct tb_ctl *ctl = req->ctl; | |
149 | ||
150 | mutex_lock(&ctl->request_queue_lock); | |
151 | list_del(&req->list); | |
152 | clear_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); | |
153 | if (test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) | |
154 | wake_up(&tb_cfg_request_cancel_queue); | |
155 | mutex_unlock(&ctl->request_queue_lock); | |
156 | } | |
157 | ||
158 | static bool tb_cfg_request_is_active(struct tb_cfg_request *req) | |
159 | { | |
160 | return test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); | |
161 | } | |
162 | ||
163 | static struct tb_cfg_request * | |
164 | tb_cfg_request_find(struct tb_ctl *ctl, struct ctl_pkg *pkg) | |
165 | { | |
03941ed9 | 166 | struct tb_cfg_request *req = NULL, *iter; |
d7f781bf MW |
167 | |
168 | mutex_lock(&pkg->ctl->request_queue_lock); | |
03941ed9 JK |
169 | list_for_each_entry(iter, &pkg->ctl->request_queue, list) { |
170 | tb_cfg_request_get(iter); | |
171 | if (iter->match(iter, pkg)) { | |
172 | req = iter; | |
d7f781bf MW |
173 | break; |
174 | } | |
03941ed9 | 175 | tb_cfg_request_put(iter); |
d7f781bf MW |
176 | } |
177 | mutex_unlock(&pkg->ctl->request_queue_lock); | |
178 | ||
03941ed9 | 179 | return req; |
d7f781bf MW |
180 | } |
181 | ||
f25bf6fc AN |
182 | /* utility functions */ |
183 | ||
d7f781bf MW |
184 | |
185 | static int check_header(const struct ctl_pkg *pkg, u32 len, | |
186 | enum tb_cfg_pkg_type type, u64 route) | |
f25bf6fc AN |
187 | { |
188 | struct tb_cfg_header *header = pkg->buffer; | |
189 | ||
190 | /* check frame, TODO: frame flags */ | |
191 | if (WARN(len != pkg->frame.size, | |
192 | "wrong framesize (expected %#x, got %#x)\n", | |
193 | len, pkg->frame.size)) | |
194 | return -EIO; | |
195 | if (WARN(type != pkg->frame.eof, "wrong eof (expected %#x, got %#x)\n", | |
196 | type, pkg->frame.eof)) | |
197 | return -EIO; | |
198 | if (WARN(pkg->frame.sof, "wrong sof (expected 0x0, got %#x)\n", | |
199 | pkg->frame.sof)) | |
200 | return -EIO; | |
201 | ||
202 | /* check header */ | |
203 | if (WARN(header->unknown != 1 << 9, | |
204 | "header->unknown is %#x\n", header->unknown)) | |
205 | return -EIO; | |
ac6c44de | 206 | if (WARN(route != tb_cfg_get_route(header), |
f25bf6fc | 207 | "wrong route (expected %llx, got %llx)", |
ac6c44de | 208 | route, tb_cfg_get_route(header))) |
f25bf6fc AN |
209 | return -EIO; |
210 | return 0; | |
211 | } | |
212 | ||
213 | static int check_config_address(struct tb_cfg_address addr, | |
214 | enum tb_cfg_space space, u32 offset, | |
215 | u32 length) | |
216 | { | |
217 | if (WARN(addr.zero, "addr.zero is %#x\n", addr.zero)) | |
218 | return -EIO; | |
219 | if (WARN(space != addr.space, "wrong space (expected %x, got %x\n)", | |
220 | space, addr.space)) | |
221 | return -EIO; | |
222 | if (WARN(offset != addr.offset, "wrong offset (expected %x, got %x\n)", | |
223 | offset, addr.offset)) | |
224 | return -EIO; | |
225 | if (WARN(length != addr.length, "wrong space (expected %x, got %x\n)", | |
226 | length, addr.length)) | |
227 | return -EIO; | |
f25bf6fc AN |
228 | /* |
229 | * We cannot check addr->port as it is set to the upstream port of the | |
230 | * sender. | |
231 | */ | |
232 | return 0; | |
233 | } | |
234 | ||
d7f781bf | 235 | static struct tb_cfg_result decode_error(const struct ctl_pkg *response) |
f25bf6fc AN |
236 | { |
237 | struct cfg_error_pkg *pkg = response->buffer; | |
238 | struct tb_cfg_result res = { 0 }; | |
ac6c44de | 239 | res.response_route = tb_cfg_get_route(&pkg->header); |
f25bf6fc AN |
240 | res.response_port = 0; |
241 | res.err = check_header(response, sizeof(*pkg), TB_CFG_PKG_ERROR, | |
ac6c44de | 242 | tb_cfg_get_route(&pkg->header)); |
f25bf6fc AN |
243 | if (res.err) |
244 | return res; | |
245 | ||
f25bf6fc AN |
246 | res.err = 1; |
247 | res.tb_error = pkg->error; | |
248 | res.response_port = pkg->port; | |
249 | return res; | |
250 | ||
251 | } | |
252 | ||
d7f781bf | 253 | static struct tb_cfg_result parse_header(const struct ctl_pkg *pkg, u32 len, |
f25bf6fc AN |
254 | enum tb_cfg_pkg_type type, u64 route) |
255 | { | |
256 | struct tb_cfg_header *header = pkg->buffer; | |
257 | struct tb_cfg_result res = { 0 }; | |
258 | ||
259 | if (pkg->frame.eof == TB_CFG_PKG_ERROR) | |
260 | return decode_error(pkg); | |
261 | ||
262 | res.response_port = 0; /* will be updated later for cfg_read/write */ | |
ac6c44de | 263 | res.response_route = tb_cfg_get_route(header); |
f25bf6fc AN |
264 | res.err = check_header(pkg, len, type, route); |
265 | return res; | |
266 | } | |
267 | ||
268 | static void tb_cfg_print_error(struct tb_ctl *ctl, | |
269 | const struct tb_cfg_result *res) | |
270 | { | |
271 | WARN_ON(res->err != 1); | |
272 | switch (res->tb_error) { | |
273 | case TB_CFG_ERROR_PORT_NOT_CONNECTED: | |
274 | /* Port is not connected. This can happen during surprise | |
275 | * removal. Do not warn. */ | |
276 | return; | |
277 | case TB_CFG_ERROR_INVALID_CONFIG_SPACE: | |
278 | /* | |
279 | * Invalid cfg_space/offset/length combination in | |
280 | * cfg_read/cfg_write. | |
281 | */ | |
fa1653d9 MW |
282 | tb_ctl_dbg(ctl, "%llx:%x: invalid config space or offset\n", |
283 | res->response_route, res->response_port); | |
f25bf6fc AN |
284 | return; |
285 | case TB_CFG_ERROR_NO_SUCH_PORT: | |
286 | /* | |
287 | * - The route contains a non-existent port. | |
288 | * - The route contains a non-PHY port (e.g. PCIe). | |
289 | * - The port in cfg_read/cfg_write does not exist. | |
290 | */ | |
291 | tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Invalid port\n", | |
292 | res->response_route, res->response_port); | |
293 | return; | |
294 | case TB_CFG_ERROR_LOOP: | |
295 | tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Route contains a loop\n", | |
296 | res->response_route, res->response_port); | |
297 | return; | |
80e7c5dd MW |
298 | case TB_CFG_ERROR_LOCK: |
299 | tb_ctl_warn(ctl, "%llx:%x: downstream port is locked\n", | |
300 | res->response_route, res->response_port); | |
301 | return; | |
f25bf6fc AN |
302 | default: |
303 | /* 5,6,7,9 and 11 are also valid error codes */ | |
304 | tb_ctl_WARN(ctl, "CFG_ERROR(%llx:%x): Unknown error\n", | |
305 | res->response_route, res->response_port); | |
306 | return; | |
307 | } | |
308 | } | |
309 | ||
d7f781bf | 310 | static __be32 tb_crc(const void *data, size_t len) |
f25bf6fc AN |
311 | { |
312 | return cpu_to_be32(~__crc32c_le(~0, data, len)); | |
313 | } | |
314 | ||
315 | static void tb_ctl_pkg_free(struct ctl_pkg *pkg) | |
316 | { | |
317 | if (pkg) { | |
318 | dma_pool_free(pkg->ctl->frame_pool, | |
319 | pkg->buffer, pkg->frame.buffer_phy); | |
320 | kfree(pkg); | |
321 | } | |
322 | } | |
323 | ||
324 | static struct ctl_pkg *tb_ctl_pkg_alloc(struct tb_ctl *ctl) | |
325 | { | |
326 | struct ctl_pkg *pkg = kzalloc(sizeof(*pkg), GFP_KERNEL); | |
327 | if (!pkg) | |
8db353bd | 328 | return NULL; |
f25bf6fc AN |
329 | pkg->ctl = ctl; |
330 | pkg->buffer = dma_pool_alloc(ctl->frame_pool, GFP_KERNEL, | |
331 | &pkg->frame.buffer_phy); | |
332 | if (!pkg->buffer) { | |
333 | kfree(pkg); | |
8db353bd | 334 | return NULL; |
f25bf6fc AN |
335 | } |
336 | return pkg; | |
337 | } | |
338 | ||
339 | ||
340 | /* RX/TX handling */ | |
341 | ||
342 | static void tb_ctl_tx_callback(struct tb_ring *ring, struct ring_frame *frame, | |
343 | bool canceled) | |
344 | { | |
345 | struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); | |
346 | tb_ctl_pkg_free(pkg); | |
347 | } | |
348 | ||
aa608253 | 349 | /* |
f25bf6fc AN |
350 | * tb_cfg_tx() - transmit a packet on the control channel |
351 | * | |
352 | * len must be a multiple of four. | |
353 | * | |
354 | * Return: Returns 0 on success or an error code on failure. | |
355 | */ | |
16a1258a | 356 | static int tb_ctl_tx(struct tb_ctl *ctl, const void *data, size_t len, |
f25bf6fc AN |
357 | enum tb_cfg_pkg_type type) |
358 | { | |
359 | int res; | |
360 | struct ctl_pkg *pkg; | |
361 | if (len % 4 != 0) { /* required for le->be conversion */ | |
362 | tb_ctl_WARN(ctl, "TX: invalid size: %zu\n", len); | |
363 | return -EINVAL; | |
364 | } | |
365 | if (len > TB_FRAME_SIZE - 4) { /* checksum is 4 bytes */ | |
366 | tb_ctl_WARN(ctl, "TX: packet too large: %zu/%d\n", | |
367 | len, TB_FRAME_SIZE - 4); | |
368 | return -EINVAL; | |
369 | } | |
370 | pkg = tb_ctl_pkg_alloc(ctl); | |
371 | if (!pkg) | |
372 | return -ENOMEM; | |
373 | pkg->frame.callback = tb_ctl_tx_callback; | |
374 | pkg->frame.size = len + 4; | |
375 | pkg->frame.sof = type; | |
376 | pkg->frame.eof = type; | |
a0c45b0b GF |
377 | |
378 | trace_tb_tx(ctl->index, type, data, len); | |
379 | ||
f25bf6fc | 380 | cpu_to_be32_array(pkg->buffer, data, len / 4); |
801dba53 | 381 | *(__be32 *) (pkg->buffer + len) = tb_crc(pkg->buffer, len); |
f25bf6fc | 382 | |
3b3d9f4d | 383 | res = tb_ring_tx(ctl->tx, &pkg->frame); |
f25bf6fc AN |
384 | if (res) /* ring is stopped */ |
385 | tb_ctl_pkg_free(pkg); | |
386 | return res; | |
387 | } | |
388 | ||
aa608253 | 389 | /* |
81a54b5e | 390 | * tb_ctl_handle_event() - acknowledge a plug event, invoke ctl->callback |
f25bf6fc | 391 | */ |
d1ff7024 | 392 | static bool tb_ctl_handle_event(struct tb_ctl *ctl, enum tb_cfg_pkg_type type, |
81a54b5e | 393 | struct ctl_pkg *pkg, size_t size) |
f25bf6fc | 394 | { |
a0c45b0b | 395 | trace_tb_event(ctl->index, type, pkg->buffer, size); |
d1ff7024 | 396 | return ctl->callback(ctl->callback_data, type, pkg->buffer, size); |
f25bf6fc AN |
397 | } |
398 | ||
399 | static void tb_ctl_rx_submit(struct ctl_pkg *pkg) | |
400 | { | |
3b3d9f4d | 401 | tb_ring_rx(pkg->ctl->rx, &pkg->frame); /* |
f25bf6fc AN |
402 | * We ignore failures during stop. |
403 | * All rx packets are referenced | |
404 | * from ctl->rx_packets, so we do | |
405 | * not loose them. | |
406 | */ | |
407 | } | |
408 | ||
81a54b5e MW |
409 | static int tb_async_error(const struct ctl_pkg *pkg) |
410 | { | |
eb100b8f | 411 | const struct cfg_error_pkg *error = pkg->buffer; |
81a54b5e MW |
412 | |
413 | if (pkg->frame.eof != TB_CFG_PKG_ERROR) | |
414 | return false; | |
415 | ||
416 | switch (error->error) { | |
417 | case TB_CFG_ERROR_LINK_ERROR: | |
418 | case TB_CFG_ERROR_HEC_ERROR_DETECTED: | |
419 | case TB_CFG_ERROR_FLOW_CONTROL_ERROR: | |
6ce35635 | 420 | case TB_CFG_ERROR_DP_BW: |
235d0194 MW |
421 | case TB_CFG_ERROR_ROP_CMPLT: |
422 | case TB_CFG_ERROR_POP_CMPLT: | |
423 | case TB_CFG_ERROR_PCIE_WAKE: | |
424 | case TB_CFG_ERROR_DP_CON_CHANGE: | |
425 | case TB_CFG_ERROR_DPTX_DISCOVERY: | |
426 | case TB_CFG_ERROR_LINK_RECOVERY: | |
427 | case TB_CFG_ERROR_ASYM_LINK: | |
81a54b5e MW |
428 | return true; |
429 | ||
430 | default: | |
431 | return false; | |
432 | } | |
433 | } | |
434 | ||
f25bf6fc AN |
435 | static void tb_ctl_rx_callback(struct tb_ring *ring, struct ring_frame *frame, |
436 | bool canceled) | |
437 | { | |
438 | struct ctl_pkg *pkg = container_of(frame, typeof(*pkg), frame); | |
d7f781bf | 439 | struct tb_cfg_request *req; |
81a54b5e | 440 | __be32 crc32; |
f25bf6fc AN |
441 | |
442 | if (canceled) | |
443 | return; /* | |
444 | * ring is stopped, packet is referenced from | |
445 | * ctl->rx_packets. | |
446 | */ | |
447 | ||
448 | if (frame->size < 4 || frame->size % 4 != 0) { | |
449 | tb_ctl_err(pkg->ctl, "RX: invalid size %#x, dropping packet\n", | |
450 | frame->size); | |
451 | goto rx; | |
452 | } | |
453 | ||
454 | frame->size -= 4; /* remove checksum */ | |
81a54b5e | 455 | crc32 = tb_crc(pkg->buffer, frame->size); |
f25bf6fc AN |
456 | be32_to_cpu_array(pkg->buffer, pkg->buffer, frame->size / 4); |
457 | ||
81a54b5e MW |
458 | switch (frame->eof) { |
459 | case TB_CFG_PKG_READ: | |
460 | case TB_CFG_PKG_WRITE: | |
461 | case TB_CFG_PKG_ERROR: | |
462 | case TB_CFG_PKG_OVERRIDE: | |
463 | case TB_CFG_PKG_RESET: | |
464 | if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { | |
465 | tb_ctl_err(pkg->ctl, | |
466 | "RX: checksum mismatch, dropping packet\n"); | |
467 | goto rx; | |
468 | } | |
469 | if (tb_async_error(pkg)) { | |
470 | tb_ctl_handle_event(pkg->ctl, frame->eof, | |
471 | pkg, frame->size); | |
472 | goto rx; | |
473 | } | |
474 | break; | |
475 | ||
476 | case TB_CFG_PKG_EVENT: | |
d1ff7024 MW |
477 | case TB_CFG_PKG_XDOMAIN_RESP: |
478 | case TB_CFG_PKG_XDOMAIN_REQ: | |
81a54b5e MW |
479 | if (*(__be32 *)(pkg->buffer + frame->size) != crc32) { |
480 | tb_ctl_err(pkg->ctl, | |
481 | "RX: checksum mismatch, dropping packet\n"); | |
482 | goto rx; | |
483 | } | |
df561f66 | 484 | fallthrough; |
f67cf491 | 485 | case TB_CFG_PKG_ICM_EVENT: |
d1ff7024 MW |
486 | if (tb_ctl_handle_event(pkg->ctl, frame->eof, pkg, frame->size)) |
487 | goto rx; | |
488 | break; | |
81a54b5e MW |
489 | |
490 | default: | |
d7f781bf | 491 | break; |
f25bf6fc | 492 | } |
81a54b5e | 493 | |
d7f781bf MW |
494 | /* |
495 | * The received packet will be processed only if there is an | |
496 | * active request and that the packet is what is expected. This | |
497 | * prevents packets such as replies coming after timeout has | |
498 | * triggered from messing with the active requests. | |
499 | */ | |
500 | req = tb_cfg_request_find(pkg->ctl, pkg); | |
a0c45b0b GF |
501 | |
502 | trace_tb_rx(pkg->ctl->index, frame->eof, pkg->buffer, frame->size, !req); | |
503 | ||
d7f781bf MW |
504 | if (req) { |
505 | if (req->copy(req, pkg)) | |
506 | schedule_work(&req->work); | |
507 | tb_cfg_request_put(req); | |
f25bf6fc | 508 | } |
d7f781bf | 509 | |
f25bf6fc AN |
510 | rx: |
511 | tb_ctl_rx_submit(pkg); | |
512 | } | |
513 | ||
d7f781bf MW |
514 | static void tb_cfg_request_work(struct work_struct *work) |
515 | { | |
516 | struct tb_cfg_request *req = container_of(work, typeof(*req), work); | |
517 | ||
518 | if (!test_bit(TB_CFG_REQUEST_CANCELED, &req->flags)) | |
519 | req->callback(req->callback_data); | |
520 | ||
521 | tb_cfg_request_dequeue(req); | |
522 | tb_cfg_request_put(req); | |
523 | } | |
524 | ||
f25bf6fc | 525 | /** |
d7f781bf MW |
526 | * tb_cfg_request() - Start control request not waiting for it to complete |
527 | * @ctl: Control channel to use | |
528 | * @req: Request to start | |
529 | * @callback: Callback called when the request is completed | |
530 | * @callback_data: Data to be passed to @callback | |
531 | * | |
532 | * This queues @req on the given control channel without waiting for it | |
533 | * to complete. When the request completes @callback is called. | |
f25bf6fc | 534 | */ |
d7f781bf MW |
535 | int tb_cfg_request(struct tb_ctl *ctl, struct tb_cfg_request *req, |
536 | void (*callback)(void *), void *callback_data) | |
f25bf6fc | 537 | { |
d7f781bf | 538 | int ret; |
f25bf6fc | 539 | |
d7f781bf MW |
540 | req->flags = 0; |
541 | req->callback = callback; | |
542 | req->callback_data = callback_data; | |
543 | INIT_WORK(&req->work, tb_cfg_request_work); | |
544 | INIT_LIST_HEAD(&req->list); | |
f25bf6fc | 545 | |
d7f781bf MW |
546 | tb_cfg_request_get(req); |
547 | ret = tb_cfg_request_enqueue(ctl, req); | |
548 | if (ret) | |
549 | goto err_put; | |
550 | ||
551 | ret = tb_ctl_tx(ctl, req->request, req->request_size, | |
552 | req->request_type); | |
553 | if (ret) | |
554 | goto err_dequeue; | |
555 | ||
556 | if (!req->response) | |
557 | schedule_work(&req->work); | |
558 | ||
559 | return 0; | |
560 | ||
561 | err_dequeue: | |
562 | tb_cfg_request_dequeue(req); | |
563 | err_put: | |
564 | tb_cfg_request_put(req); | |
565 | ||
566 | return ret; | |
567 | } | |
568 | ||
569 | /** | |
570 | * tb_cfg_request_cancel() - Cancel a control request | |
571 | * @req: Request to cancel | |
572 | * @err: Error to assign to the request | |
573 | * | |
574 | * This function can be used to cancel ongoing request. It will wait | |
575 | * until the request is not active anymore. | |
576 | */ | |
577 | void tb_cfg_request_cancel(struct tb_cfg_request *req, int err) | |
578 | { | |
579 | set_bit(TB_CFG_REQUEST_CANCELED, &req->flags); | |
580 | schedule_work(&req->work); | |
581 | wait_event(tb_cfg_request_cancel_queue, !tb_cfg_request_is_active(req)); | |
582 | req->result.err = err; | |
f25bf6fc AN |
583 | } |
584 | ||
d7f781bf MW |
585 | static void tb_cfg_request_complete(void *data) |
586 | { | |
587 | complete(data); | |
588 | } | |
589 | ||
590 | /** | |
591 | * tb_cfg_request_sync() - Start control request and wait until it completes | |
592 | * @ctl: Control channel to use | |
593 | * @req: Request to start | |
594 | * @timeout_msec: Timeout how long to wait @req to complete | |
595 | * | |
596 | * Starts a control request and waits until it completes. If timeout | |
597 | * triggers the request is canceled before function returns. Note the | |
598 | * caller needs to make sure only one message for given switch is active | |
599 | * at a time. | |
600 | */ | |
601 | struct tb_cfg_result tb_cfg_request_sync(struct tb_ctl *ctl, | |
602 | struct tb_cfg_request *req, | |
603 | int timeout_msec) | |
604 | { | |
605 | unsigned long timeout = msecs_to_jiffies(timeout_msec); | |
606 | struct tb_cfg_result res = { 0 }; | |
607 | DECLARE_COMPLETION_ONSTACK(done); | |
608 | int ret; | |
609 | ||
610 | ret = tb_cfg_request(ctl, req, tb_cfg_request_complete, &done); | |
611 | if (ret) { | |
612 | res.err = ret; | |
613 | return res; | |
614 | } | |
615 | ||
616 | if (!wait_for_completion_timeout(&done, timeout)) | |
617 | tb_cfg_request_cancel(req, -ETIMEDOUT); | |
618 | ||
619 | flush_work(&req->work); | |
620 | ||
621 | return req->result; | |
622 | } | |
f25bf6fc AN |
623 | |
624 | /* public interface, alloc/start/stop/free */ | |
625 | ||
626 | /** | |
627 | * tb_ctl_alloc() - allocate a control channel | |
9c3db0b7 | 628 | * @nhi: Pointer to NHI |
a0c45b0b | 629 | * @index: Domain number |
7f0a34d7 | 630 | * @timeout_msec: Default timeout used with non-raw control messages |
9c3db0b7 MW |
631 | * @cb: Callback called for plug events |
632 | * @cb_data: Data passed to @cb | |
f25bf6fc AN |
633 | * |
634 | * cb will be invoked once for every hot plug event. | |
635 | * | |
636 | * Return: Returns a pointer on success or NULL on failure. | |
637 | */ | |
a0c45b0b GF |
638 | struct tb_ctl *tb_ctl_alloc(struct tb_nhi *nhi, int index, int timeout_msec, |
639 | event_cb cb, void *cb_data) | |
f25bf6fc AN |
640 | { |
641 | int i; | |
642 | struct tb_ctl *ctl = kzalloc(sizeof(*ctl), GFP_KERNEL); | |
643 | if (!ctl) | |
644 | return NULL; | |
a0c45b0b | 645 | |
f25bf6fc | 646 | ctl->nhi = nhi; |
a0c45b0b | 647 | ctl->index = index; |
7f0a34d7 | 648 | ctl->timeout_msec = timeout_msec; |
f25bf6fc AN |
649 | ctl->callback = cb; |
650 | ctl->callback_data = cb_data; | |
651 | ||
d7f781bf MW |
652 | mutex_init(&ctl->request_queue_lock); |
653 | INIT_LIST_HEAD(&ctl->request_queue); | |
f25bf6fc AN |
654 | ctl->frame_pool = dma_pool_create("thunderbolt_ctl", &nhi->pdev->dev, |
655 | TB_FRAME_SIZE, 4, 0); | |
656 | if (!ctl->frame_pool) | |
657 | goto err; | |
658 | ||
3b3d9f4d | 659 | ctl->tx = tb_ring_alloc_tx(nhi, 0, 10, RING_FLAG_NO_SUSPEND); |
f25bf6fc AN |
660 | if (!ctl->tx) |
661 | goto err; | |
662 | ||
afe704a2 MW |
663 | ctl->rx = tb_ring_alloc_rx(nhi, 0, 10, RING_FLAG_NO_SUSPEND, 0, 0xffff, |
664 | 0xffff, NULL, NULL); | |
f25bf6fc AN |
665 | if (!ctl->rx) |
666 | goto err; | |
667 | ||
668 | for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) { | |
669 | ctl->rx_packets[i] = tb_ctl_pkg_alloc(ctl); | |
670 | if (!ctl->rx_packets[i]) | |
671 | goto err; | |
672 | ctl->rx_packets[i]->frame.callback = tb_ctl_rx_callback; | |
673 | } | |
674 | ||
daa5140f | 675 | tb_ctl_dbg(ctl, "control channel created\n"); |
f25bf6fc AN |
676 | return ctl; |
677 | err: | |
678 | tb_ctl_free(ctl); | |
679 | return NULL; | |
680 | } | |
681 | ||
682 | /** | |
683 | * tb_ctl_free() - free a control channel | |
9c3db0b7 | 684 | * @ctl: Control channel to free |
f25bf6fc AN |
685 | * |
686 | * Must be called after tb_ctl_stop. | |
687 | * | |
688 | * Must NOT be called from ctl->callback. | |
689 | */ | |
690 | void tb_ctl_free(struct tb_ctl *ctl) | |
691 | { | |
692 | int i; | |
c9843ebb MW |
693 | |
694 | if (!ctl) | |
695 | return; | |
696 | ||
f25bf6fc | 697 | if (ctl->rx) |
3b3d9f4d | 698 | tb_ring_free(ctl->rx); |
f25bf6fc | 699 | if (ctl->tx) |
3b3d9f4d | 700 | tb_ring_free(ctl->tx); |
f25bf6fc AN |
701 | |
702 | /* free RX packets */ | |
703 | for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) | |
704 | tb_ctl_pkg_free(ctl->rx_packets[i]); | |
705 | ||
706 | ||
0bb5a1a2 | 707 | dma_pool_destroy(ctl->frame_pool); |
f25bf6fc AN |
708 | kfree(ctl); |
709 | } | |
710 | ||
711 | /** | |
e173b7d4 | 712 | * tb_ctl_start() - start/resume the control channel |
9c3db0b7 | 713 | * @ctl: Control channel to start |
f25bf6fc AN |
714 | */ |
715 | void tb_ctl_start(struct tb_ctl *ctl) | |
716 | { | |
717 | int i; | |
daa5140f | 718 | tb_ctl_dbg(ctl, "control channel starting...\n"); |
3b3d9f4d MW |
719 | tb_ring_start(ctl->tx); /* is used to ack hotplug packets, start first */ |
720 | tb_ring_start(ctl->rx); | |
f25bf6fc AN |
721 | for (i = 0; i < TB_CTL_RX_PKG_COUNT; i++) |
722 | tb_ctl_rx_submit(ctl->rx_packets[i]); | |
d7f781bf MW |
723 | |
724 | ctl->running = true; | |
f25bf6fc AN |
725 | } |
726 | ||
727 | /** | |
e173b7d4 | 728 | * tb_ctl_stop() - pause the control channel |
9c3db0b7 | 729 | * @ctl: Control channel to stop |
f25bf6fc AN |
730 | * |
731 | * All invocations of ctl->callback will have finished after this method | |
732 | * returns. | |
733 | * | |
734 | * Must NOT be called from ctl->callback. | |
735 | */ | |
736 | void tb_ctl_stop(struct tb_ctl *ctl) | |
737 | { | |
d7f781bf MW |
738 | mutex_lock(&ctl->request_queue_lock); |
739 | ctl->running = false; | |
740 | mutex_unlock(&ctl->request_queue_lock); | |
741 | ||
3b3d9f4d MW |
742 | tb_ring_stop(ctl->rx); |
743 | tb_ring_stop(ctl->tx); | |
f25bf6fc | 744 | |
d7f781bf MW |
745 | if (!list_empty(&ctl->request_queue)) |
746 | tb_ctl_WARN(ctl, "dangling request in request_queue\n"); | |
747 | INIT_LIST_HEAD(&ctl->request_queue); | |
daa5140f | 748 | tb_ctl_dbg(ctl, "control channel stopped\n"); |
f25bf6fc AN |
749 | } |
750 | ||
751 | /* public interface, commands */ | |
752 | ||
6ce35635 MW |
753 | /** |
754 | * tb_cfg_ack_notification() - Ack notification | |
755 | * @ctl: Control channel to use | |
756 | * @route: Router that originated the event | |
757 | * @error: Pointer to the notification package | |
758 | * | |
759 | * Call this as response for non-plug notification to ack it. Returns | |
760 | * %0 on success or an error code on failure. | |
761 | */ | |
762 | int tb_cfg_ack_notification(struct tb_ctl *ctl, u64 route, | |
763 | const struct cfg_error_pkg *error) | |
764 | { | |
765 | struct cfg_ack_pkg pkg = { | |
766 | .header = tb_cfg_make_header(route), | |
767 | }; | |
768 | const char *name; | |
769 | ||
770 | switch (error->error) { | |
771 | case TB_CFG_ERROR_LINK_ERROR: | |
772 | name = "link error"; | |
773 | break; | |
774 | case TB_CFG_ERROR_HEC_ERROR_DETECTED: | |
775 | name = "HEC error"; | |
776 | break; | |
777 | case TB_CFG_ERROR_FLOW_CONTROL_ERROR: | |
778 | name = "flow control error"; | |
779 | break; | |
780 | case TB_CFG_ERROR_DP_BW: | |
781 | name = "DP_BW"; | |
782 | break; | |
235d0194 MW |
783 | case TB_CFG_ERROR_ROP_CMPLT: |
784 | name = "router operation completion"; | |
785 | break; | |
786 | case TB_CFG_ERROR_POP_CMPLT: | |
787 | name = "port operation completion"; | |
788 | break; | |
789 | case TB_CFG_ERROR_PCIE_WAKE: | |
790 | name = "PCIe wake"; | |
791 | break; | |
792 | case TB_CFG_ERROR_DP_CON_CHANGE: | |
793 | name = "DP connector change"; | |
794 | break; | |
795 | case TB_CFG_ERROR_DPTX_DISCOVERY: | |
796 | name = "DPTX discovery"; | |
797 | break; | |
798 | case TB_CFG_ERROR_LINK_RECOVERY: | |
799 | name = "link recovery"; | |
800 | break; | |
801 | case TB_CFG_ERROR_ASYM_LINK: | |
802 | name = "asymmetric link"; | |
803 | break; | |
6ce35635 MW |
804 | default: |
805 | name = "unknown"; | |
806 | break; | |
807 | } | |
808 | ||
809 | tb_ctl_dbg(ctl, "acking %s (%#x) notification on %llx\n", name, | |
810 | error->error, route); | |
811 | ||
812 | return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_NOTIFY_ACK); | |
813 | } | |
814 | ||
f25bf6fc | 815 | /** |
210e9f56 MW |
816 | * tb_cfg_ack_plug() - Ack hot plug/unplug event |
817 | * @ctl: Control channel to use | |
818 | * @route: Router that originated the event | |
819 | * @port: Port where the hot plug/unplug happened | |
820 | * @unplug: Ack hot plug or unplug | |
f25bf6fc | 821 | * |
210e9f56 MW |
822 | * Call this as response for hot plug/unplug event to ack it. |
823 | * Returns %0 on success or an error code on failure. | |
f25bf6fc | 824 | */ |
210e9f56 | 825 | int tb_cfg_ack_plug(struct tb_ctl *ctl, u64 route, u32 port, bool unplug) |
f25bf6fc AN |
826 | { |
827 | struct cfg_error_pkg pkg = { | |
05c242e9 | 828 | .header = tb_cfg_make_header(route), |
f25bf6fc | 829 | .port = port, |
210e9f56 MW |
830 | .error = TB_CFG_ERROR_ACK_PLUG_EVENT, |
831 | .pg = unplug ? TB_CFG_ERROR_PG_HOT_UNPLUG | |
832 | : TB_CFG_ERROR_PG_HOT_PLUG, | |
f25bf6fc | 833 | }; |
49f2b350 | 834 | tb_ctl_dbg(ctl, "acking hot %splug event on %llx:%u\n", |
210e9f56 | 835 | unplug ? "un" : "", route, port); |
f25bf6fc AN |
836 | return tb_ctl_tx(ctl, &pkg, sizeof(pkg), TB_CFG_PKG_ERROR); |
837 | } | |
838 | ||
d7f781bf MW |
839 | static bool tb_cfg_match(const struct tb_cfg_request *req, |
840 | const struct ctl_pkg *pkg) | |
841 | { | |
842 | u64 route = tb_cfg_get_route(pkg->buffer) & ~BIT_ULL(63); | |
843 | ||
844 | if (pkg->frame.eof == TB_CFG_PKG_ERROR) | |
845 | return true; | |
846 | ||
847 | if (pkg->frame.eof != req->response_type) | |
848 | return false; | |
849 | if (route != tb_cfg_get_route(req->request)) | |
850 | return false; | |
851 | if (pkg->frame.size != req->response_size) | |
852 | return false; | |
853 | ||
854 | if (pkg->frame.eof == TB_CFG_PKG_READ || | |
855 | pkg->frame.eof == TB_CFG_PKG_WRITE) { | |
856 | const struct cfg_read_pkg *req_hdr = req->request; | |
857 | const struct cfg_read_pkg *res_hdr = pkg->buffer; | |
858 | ||
859 | if (req_hdr->addr.seq != res_hdr->addr.seq) | |
860 | return false; | |
861 | } | |
862 | ||
863 | return true; | |
864 | } | |
865 | ||
866 | static bool tb_cfg_copy(struct tb_cfg_request *req, const struct ctl_pkg *pkg) | |
867 | { | |
868 | struct tb_cfg_result res; | |
869 | ||
870 | /* Now make sure it is in expected format */ | |
871 | res = parse_header(pkg, req->response_size, req->response_type, | |
872 | tb_cfg_get_route(req->request)); | |
873 | if (!res.err) | |
874 | memcpy(req->response, pkg->buffer, req->response_size); | |
875 | ||
876 | req->result = res; | |
877 | ||
878 | /* Always complete when first response is received */ | |
879 | return true; | |
880 | } | |
881 | ||
f25bf6fc AN |
882 | /** |
883 | * tb_cfg_reset() - send a reset packet and wait for a response | |
9c3db0b7 MW |
884 | * @ctl: Control channel pointer |
885 | * @route: Router string for the router to send reset | |
f25bf6fc AN |
886 | * |
887 | * If the switch at route is incorrectly configured then we will not receive a | |
888 | * reply (even though the switch will reset). The caller should check for | |
889 | * -ETIMEDOUT and attempt to reconfigure the switch. | |
890 | */ | |
bda83aec | 891 | struct tb_cfg_result tb_cfg_reset(struct tb_ctl *ctl, u64 route) |
f25bf6fc | 892 | { |
05c242e9 | 893 | struct cfg_reset_pkg request = { .header = tb_cfg_make_header(route) }; |
d7f781bf | 894 | struct tb_cfg_result res = { 0 }; |
f25bf6fc | 895 | struct tb_cfg_header reply; |
d7f781bf MW |
896 | struct tb_cfg_request *req; |
897 | ||
898 | req = tb_cfg_request_alloc(); | |
899 | if (!req) { | |
900 | res.err = -ENOMEM; | |
901 | return res; | |
902 | } | |
903 | ||
904 | req->match = tb_cfg_match; | |
905 | req->copy = tb_cfg_copy; | |
906 | req->request = &request; | |
907 | req->request_size = sizeof(request); | |
908 | req->request_type = TB_CFG_PKG_RESET; | |
909 | req->response = &reply; | |
910 | req->response_size = sizeof(reply); | |
02729d17 | 911 | req->response_type = TB_CFG_PKG_RESET; |
d7f781bf | 912 | |
7f0a34d7 | 913 | res = tb_cfg_request_sync(ctl, req, ctl->timeout_msec); |
f25bf6fc | 914 | |
d7f781bf | 915 | tb_cfg_request_put(req); |
f25bf6fc | 916 | |
d7f781bf | 917 | return res; |
f25bf6fc AN |
918 | } |
919 | ||
920 | /** | |
9c3db0b7 MW |
921 | * tb_cfg_read_raw() - read from config space into buffer |
922 | * @ctl: Pointer to the control channel | |
923 | * @buffer: Buffer where the data is read | |
924 | * @route: Route string of the router | |
925 | * @port: Port number when reading from %TB_CFG_PORT, %0 otherwise | |
926 | * @space: Config space selector | |
927 | * @offset: Dword word offset of the register to start reading | |
928 | * @length: Number of dwords to read | |
929 | * @timeout_msec: Timeout in ms how long to wait for the response | |
f25bf6fc | 930 | * |
9c3db0b7 | 931 | * Reads from router config space without translating the possible error. |
f25bf6fc AN |
932 | */ |
933 | struct tb_cfg_result tb_cfg_read_raw(struct tb_ctl *ctl, void *buffer, | |
934 | u64 route, u32 port, enum tb_cfg_space space, | |
935 | u32 offset, u32 length, int timeout_msec) | |
936 | { | |
937 | struct tb_cfg_result res = { 0 }; | |
938 | struct cfg_read_pkg request = { | |
05c242e9 | 939 | .header = tb_cfg_make_header(route), |
f25bf6fc AN |
940 | .addr = { |
941 | .port = port, | |
942 | .space = space, | |
943 | .offset = offset, | |
944 | .length = length, | |
945 | }, | |
946 | }; | |
947 | struct cfg_write_pkg reply; | |
d7f781bf | 948 | int retries = 0; |
f25bf6fc | 949 | |
d7f781bf MW |
950 | while (retries < TB_CTL_RETRIES) { |
951 | struct tb_cfg_request *req; | |
952 | ||
953 | req = tb_cfg_request_alloc(); | |
954 | if (!req) { | |
955 | res.err = -ENOMEM; | |
956 | return res; | |
957 | } | |
958 | ||
959 | request.addr.seq = retries++; | |
960 | ||
961 | req->match = tb_cfg_match; | |
962 | req->copy = tb_cfg_copy; | |
963 | req->request = &request; | |
964 | req->request_size = sizeof(request); | |
965 | req->request_type = TB_CFG_PKG_READ; | |
966 | req->response = &reply; | |
967 | req->response_size = 12 + 4 * length; | |
968 | req->response_type = TB_CFG_PKG_READ; | |
969 | ||
970 | res = tb_cfg_request_sync(ctl, req, timeout_msec); | |
971 | ||
972 | tb_cfg_request_put(req); | |
973 | ||
974 | if (res.err != -ETIMEDOUT) | |
975 | break; | |
976 | ||
977 | /* Wait a bit (arbitrary time) until we send a retry */ | |
978 | usleep_range(10, 100); | |
979 | } | |
f25bf6fc | 980 | |
f25bf6fc AN |
981 | if (res.err) |
982 | return res; | |
983 | ||
984 | res.response_port = reply.addr.port; | |
985 | res.err = check_config_address(reply.addr, space, offset, length); | |
986 | if (!res.err) | |
987 | memcpy(buffer, &reply.data, 4 * length); | |
988 | return res; | |
989 | } | |
990 | ||
991 | /** | |
e173b7d4 | 992 | * tb_cfg_write_raw() - write from buffer into config space |
9c3db0b7 MW |
993 | * @ctl: Pointer to the control channel |
994 | * @buffer: Data to write | |
995 | * @route: Route string of the router | |
996 | * @port: Port number when writing to %TB_CFG_PORT, %0 otherwise | |
997 | * @space: Config space selector | |
998 | * @offset: Dword word offset of the register to start writing | |
999 | * @length: Number of dwords to write | |
1000 | * @timeout_msec: Timeout in ms how long to wait for the response | |
f25bf6fc | 1001 | * |
9c3db0b7 | 1002 | * Writes to router config space without translating the possible error. |
f25bf6fc | 1003 | */ |
16a1258a | 1004 | struct tb_cfg_result tb_cfg_write_raw(struct tb_ctl *ctl, const void *buffer, |
f25bf6fc AN |
1005 | u64 route, u32 port, enum tb_cfg_space space, |
1006 | u32 offset, u32 length, int timeout_msec) | |
1007 | { | |
1008 | struct tb_cfg_result res = { 0 }; | |
1009 | struct cfg_write_pkg request = { | |
05c242e9 | 1010 | .header = tb_cfg_make_header(route), |
f25bf6fc AN |
1011 | .addr = { |
1012 | .port = port, | |
1013 | .space = space, | |
1014 | .offset = offset, | |
1015 | .length = length, | |
1016 | }, | |
1017 | }; | |
1018 | struct cfg_read_pkg reply; | |
d7f781bf | 1019 | int retries = 0; |
f25bf6fc AN |
1020 | |
1021 | memcpy(&request.data, buffer, length * 4); | |
1022 | ||
d7f781bf MW |
1023 | while (retries < TB_CTL_RETRIES) { |
1024 | struct tb_cfg_request *req; | |
1025 | ||
1026 | req = tb_cfg_request_alloc(); | |
1027 | if (!req) { | |
1028 | res.err = -ENOMEM; | |
1029 | return res; | |
1030 | } | |
1031 | ||
1032 | request.addr.seq = retries++; | |
1033 | ||
1034 | req->match = tb_cfg_match; | |
1035 | req->copy = tb_cfg_copy; | |
1036 | req->request = &request; | |
1037 | req->request_size = 12 + 4 * length; | |
1038 | req->request_type = TB_CFG_PKG_WRITE; | |
1039 | req->response = &reply; | |
1040 | req->response_size = sizeof(reply); | |
1041 | req->response_type = TB_CFG_PKG_WRITE; | |
1042 | ||
1043 | res = tb_cfg_request_sync(ctl, req, timeout_msec); | |
1044 | ||
1045 | tb_cfg_request_put(req); | |
1046 | ||
1047 | if (res.err != -ETIMEDOUT) | |
1048 | break; | |
1049 | ||
1050 | /* Wait a bit (arbitrary time) until we send a retry */ | |
1051 | usleep_range(10, 100); | |
1052 | } | |
f25bf6fc | 1053 | |
f25bf6fc AN |
1054 | if (res.err) |
1055 | return res; | |
1056 | ||
1057 | res.response_port = reply.addr.port; | |
1058 | res.err = check_config_address(reply.addr, space, offset, length); | |
1059 | return res; | |
1060 | } | |
1061 | ||
d94dcbb1 MW |
1062 | static int tb_cfg_get_error(struct tb_ctl *ctl, enum tb_cfg_space space, |
1063 | const struct tb_cfg_result *res) | |
1064 | { | |
1065 | /* | |
1066 | * For unimplemented ports access to port config space may return | |
1067 | * TB_CFG_ERROR_INVALID_CONFIG_SPACE (alternatively their type is | |
1068 | * set to TB_TYPE_INACTIVE). In the former case return -ENODEV so | |
1069 | * that the caller can mark the port as disabled. | |
1070 | */ | |
1071 | if (space == TB_CFG_PORT && | |
1072 | res->tb_error == TB_CFG_ERROR_INVALID_CONFIG_SPACE) | |
1073 | return -ENODEV; | |
1074 | ||
1075 | tb_cfg_print_error(ctl, res); | |
80e7c5dd MW |
1076 | |
1077 | if (res->tb_error == TB_CFG_ERROR_LOCK) | |
1078 | return -EACCES; | |
4e99c98e | 1079 | if (res->tb_error == TB_CFG_ERROR_PORT_NOT_CONNECTED) |
463e48fa MW |
1080 | return -ENOTCONN; |
1081 | ||
d94dcbb1 MW |
1082 | return -EIO; |
1083 | } | |
1084 | ||
f25bf6fc AN |
1085 | int tb_cfg_read(struct tb_ctl *ctl, void *buffer, u64 route, u32 port, |
1086 | enum tb_cfg_space space, u32 offset, u32 length) | |
1087 | { | |
1088 | struct tb_cfg_result res = tb_cfg_read_raw(ctl, buffer, route, port, | |
7f0a34d7 | 1089 | space, offset, length, ctl->timeout_msec); |
d7f781bf MW |
1090 | switch (res.err) { |
1091 | case 0: | |
1092 | /* Success */ | |
1093 | break; | |
1094 | ||
1095 | case 1: | |
1096 | /* Thunderbolt error, tb_error holds the actual number */ | |
d94dcbb1 | 1097 | return tb_cfg_get_error(ctl, space, &res); |
d7f781bf MW |
1098 | |
1099 | case -ETIMEDOUT: | |
68b91293 MW |
1100 | tb_ctl_warn(ctl, "%llx: timeout reading config space %u from %#x\n", |
1101 | route, space, offset); | |
d7f781bf MW |
1102 | break; |
1103 | ||
1104 | default: | |
1105 | WARN(1, "tb_cfg_read: %d\n", res.err); | |
1106 | break; | |
f25bf6fc | 1107 | } |
f25bf6fc AN |
1108 | return res.err; |
1109 | } | |
1110 | ||
16a1258a | 1111 | int tb_cfg_write(struct tb_ctl *ctl, const void *buffer, u64 route, u32 port, |
f25bf6fc AN |
1112 | enum tb_cfg_space space, u32 offset, u32 length) |
1113 | { | |
1114 | struct tb_cfg_result res = tb_cfg_write_raw(ctl, buffer, route, port, | |
7f0a34d7 | 1115 | space, offset, length, ctl->timeout_msec); |
d7f781bf MW |
1116 | switch (res.err) { |
1117 | case 0: | |
1118 | /* Success */ | |
1119 | break; | |
1120 | ||
1121 | case 1: | |
1122 | /* Thunderbolt error, tb_error holds the actual number */ | |
d94dcbb1 | 1123 | return tb_cfg_get_error(ctl, space, &res); |
d7f781bf MW |
1124 | |
1125 | case -ETIMEDOUT: | |
68b91293 MW |
1126 | tb_ctl_warn(ctl, "%llx: timeout writing config space %u to %#x\n", |
1127 | route, space, offset); | |
d7f781bf MW |
1128 | break; |
1129 | ||
1130 | default: | |
1131 | WARN(1, "tb_cfg_write: %d\n", res.err); | |
1132 | break; | |
f25bf6fc | 1133 | } |
f25bf6fc AN |
1134 | return res.err; |
1135 | } | |
1136 | ||
1137 | /** | |
1138 | * tb_cfg_get_upstream_port() - get upstream port number of switch at route | |
9c3db0b7 MW |
1139 | * @ctl: Pointer to the control channel |
1140 | * @route: Route string of the router | |
f25bf6fc AN |
1141 | * |
1142 | * Reads the first dword from the switches TB_CFG_SWITCH config area and | |
1143 | * returns the port number from which the reply originated. | |
1144 | * | |
1145 | * Return: Returns the upstream port number on success or an error code on | |
1146 | * failure. | |
1147 | */ | |
1148 | int tb_cfg_get_upstream_port(struct tb_ctl *ctl, u64 route) | |
1149 | { | |
1150 | u32 dummy; | |
1151 | struct tb_cfg_result res = tb_cfg_read_raw(ctl, &dummy, route, 0, | |
1152 | TB_CFG_SWITCH, 0, 1, | |
7f0a34d7 | 1153 | ctl->timeout_msec); |
f25bf6fc AN |
1154 | if (res.err == 1) |
1155 | return -EIO; | |
1156 | if (res.err) | |
1157 | return res.err; | |
1158 | return res.response_port; | |
1159 | } |