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1/****************************************************************************
2 * Driver for Solarflare network controllers and boards
3 * Copyright 2008-2013 Solarflare Communications Inc.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation, incorporated herein by reference.
8 */
9
10#include <linux/delay.h>
11#include <linux/moduleparam.h>
12#include <linux/atomic.h>
13#include "net_driver.h"
14#include "nic.h"
15#include "io.h"
16#include "farch_regs.h"
17#include "mcdi_pcol.h"
18
19/**************************************************************************
20 *
21 * Management-Controller-to-Driver Interface
22 *
23 **************************************************************************
24 */
25
26#define MCDI_RPC_TIMEOUT (10 * HZ)
27
28/* A reboot/assertion causes the MCDI status word to be set after the
29 * command word is set or a REBOOT event is sent. If we notice a reboot
30 * via these mechanisms then wait 250ms for the status word to be set.
31 */
32#define MCDI_STATUS_DELAY_US 100
33#define MCDI_STATUS_DELAY_COUNT 2500
34#define MCDI_STATUS_SLEEP_MS \
35 (MCDI_STATUS_DELAY_US * MCDI_STATUS_DELAY_COUNT / 1000)
36
37#define SEQ_MASK \
38 EFX_MASK32(EFX_WIDTH(MCDI_HEADER_SEQ))
39
40struct efx_mcdi_async_param {
41 struct list_head list;
42 unsigned int cmd;
43 size_t inlen;
44 size_t outlen;
45 bool quiet;
46 efx_mcdi_async_completer *complete;
47 unsigned long cookie;
48 /* followed by request/response buffer */
49};
50
51static void efx_mcdi_timeout_async(unsigned long context);
52static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
53 bool *was_attached_out);
54static bool efx_mcdi_poll_once(struct efx_nic *efx);
55static void efx_mcdi_abandon(struct efx_nic *efx);
56
57#ifdef CONFIG_SFC_MCDI_LOGGING
58static bool mcdi_logging_default;
59module_param(mcdi_logging_default, bool, 0644);
60MODULE_PARM_DESC(mcdi_logging_default,
61 "Enable MCDI logging on newly-probed functions");
62#endif
63
64int efx_mcdi_init(struct efx_nic *efx)
65{
66 struct efx_mcdi_iface *mcdi;
67 bool already_attached;
68 int rc = -ENOMEM;
69
70 efx->mcdi = kzalloc(sizeof(*efx->mcdi), GFP_KERNEL);
71 if (!efx->mcdi)
72 goto fail;
73
74 mcdi = efx_mcdi(efx);
75 mcdi->efx = efx;
76#ifdef CONFIG_SFC_MCDI_LOGGING
77 /* consuming code assumes buffer is page-sized */
78 mcdi->logging_buffer = (char *)__get_free_page(GFP_KERNEL);
79 if (!mcdi->logging_buffer)
80 goto fail1;
81 mcdi->logging_enabled = mcdi_logging_default;
82#endif
83 init_waitqueue_head(&mcdi->wq);
84 init_waitqueue_head(&mcdi->proxy_rx_wq);
85 spin_lock_init(&mcdi->iface_lock);
86 mcdi->state = MCDI_STATE_QUIESCENT;
87 mcdi->mode = MCDI_MODE_POLL;
88 spin_lock_init(&mcdi->async_lock);
89 INIT_LIST_HEAD(&mcdi->async_list);
90 setup_timer(&mcdi->async_timer, efx_mcdi_timeout_async,
91 (unsigned long)mcdi);
92
93 (void) efx_mcdi_poll_reboot(efx);
94 mcdi->new_epoch = true;
95
96 /* Recover from a failed assertion before probing */
97 rc = efx_mcdi_handle_assertion(efx);
98 if (rc)
99 goto fail2;
100
101 /* Let the MC (and BMC, if this is a LOM) know that the driver
102 * is loaded. We should do this before we reset the NIC.
103 */
104 rc = efx_mcdi_drv_attach(efx, true, &already_attached);
105 if (rc) {
106 netif_err(efx, probe, efx->net_dev,
107 "Unable to register driver with MCPU\n");
108 goto fail2;
109 }
110 if (already_attached)
111 /* Not a fatal error */
112 netif_err(efx, probe, efx->net_dev,
113 "Host already registered with MCPU\n");
114
115 if (efx->mcdi->fn_flags &
116 (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY))
117 efx->primary = efx;
118
119 return 0;
120fail2:
121#ifdef CONFIG_SFC_MCDI_LOGGING
122 free_page((unsigned long)mcdi->logging_buffer);
123fail1:
124#endif
125 kfree(efx->mcdi);
126 efx->mcdi = NULL;
127fail:
128 return rc;
129}
130
131void efx_mcdi_fini(struct efx_nic *efx)
132{
133 if (!efx->mcdi)
134 return;
135
136 BUG_ON(efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);
137
138 /* Relinquish the device (back to the BMC, if this is a LOM) */
139 efx_mcdi_drv_attach(efx, false, NULL);
140
141#ifdef CONFIG_SFC_MCDI_LOGGING
142 free_page((unsigned long)efx->mcdi->iface.logging_buffer);
143#endif
144
145 kfree(efx->mcdi);
146}
147
148static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
149 const efx_dword_t *inbuf, size_t inlen)
150{
151 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
152#ifdef CONFIG_SFC_MCDI_LOGGING
153 char *buf = mcdi->logging_buffer; /* page-sized */
154#endif
155 efx_dword_t hdr[2];
156 size_t hdr_len;
157 u32 xflags, seqno;
158
159 BUG_ON(mcdi->state == MCDI_STATE_QUIESCENT);
160
161 /* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
162 spin_lock_bh(&mcdi->iface_lock);
163 ++mcdi->seqno;
164 spin_unlock_bh(&mcdi->iface_lock);
165
166 seqno = mcdi->seqno & SEQ_MASK;
167 xflags = 0;
168 if (mcdi->mode == MCDI_MODE_EVENTS)
169 xflags |= MCDI_HEADER_XFLAGS_EVREQ;
170
171 if (efx->type->mcdi_max_ver == 1) {
172 /* MCDI v1 */
173 EFX_POPULATE_DWORD_7(hdr[0],
174 MCDI_HEADER_RESPONSE, 0,
175 MCDI_HEADER_RESYNC, 1,
176 MCDI_HEADER_CODE, cmd,
177 MCDI_HEADER_DATALEN, inlen,
178 MCDI_HEADER_SEQ, seqno,
179 MCDI_HEADER_XFLAGS, xflags,
180 MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
181 hdr_len = 4;
182 } else {
183 /* MCDI v2 */
184 BUG_ON(inlen > MCDI_CTL_SDU_LEN_MAX_V2);
185 EFX_POPULATE_DWORD_7(hdr[0],
186 MCDI_HEADER_RESPONSE, 0,
187 MCDI_HEADER_RESYNC, 1,
188 MCDI_HEADER_CODE, MC_CMD_V2_EXTN,
189 MCDI_HEADER_DATALEN, 0,
190 MCDI_HEADER_SEQ, seqno,
191 MCDI_HEADER_XFLAGS, xflags,
192 MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
193 EFX_POPULATE_DWORD_2(hdr[1],
194 MC_CMD_V2_EXTN_IN_EXTENDED_CMD, cmd,
195 MC_CMD_V2_EXTN_IN_ACTUAL_LEN, inlen);
196 hdr_len = 8;
197 }
198
199#ifdef CONFIG_SFC_MCDI_LOGGING
200 if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
201 int bytes = 0;
202 int i;
203 /* Lengths should always be a whole number of dwords, so scream
204 * if they're not.
205 */
206 WARN_ON_ONCE(hdr_len % 4);
207 WARN_ON_ONCE(inlen % 4);
208
209 /* We own the logging buffer, as only one MCDI can be in
210 * progress on a NIC at any one time. So no need for locking.
211 */
212 for (i = 0; i < hdr_len / 4 && bytes < PAGE_SIZE; i++)
213 bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
214 " %08x", le32_to_cpu(hdr[i].u32[0]));
215
216 for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++)
217 bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
218 " %08x", le32_to_cpu(inbuf[i].u32[0]));
219
220 netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
221 }
222#endif
223
224 efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);
225
226 mcdi->new_epoch = false;
227}
228
229static int efx_mcdi_errno(unsigned int mcdi_err)
230{
231 switch (mcdi_err) {
232 case 0:
233 return 0;
234#define TRANSLATE_ERROR(name) \
235 case MC_CMD_ERR_ ## name: \
236 return -name;
237 TRANSLATE_ERROR(EPERM);
238 TRANSLATE_ERROR(ENOENT);
239 TRANSLATE_ERROR(EINTR);
240 TRANSLATE_ERROR(EAGAIN);
241 TRANSLATE_ERROR(EACCES);
242 TRANSLATE_ERROR(EBUSY);
243 TRANSLATE_ERROR(EINVAL);
244 TRANSLATE_ERROR(EDEADLK);
245 TRANSLATE_ERROR(ENOSYS);
246 TRANSLATE_ERROR(ETIME);
247 TRANSLATE_ERROR(EALREADY);
248 TRANSLATE_ERROR(ENOSPC);
249#undef TRANSLATE_ERROR
250 case MC_CMD_ERR_ENOTSUP:
251 return -EOPNOTSUPP;
252 case MC_CMD_ERR_ALLOC_FAIL:
253 return -ENOBUFS;
254 case MC_CMD_ERR_MAC_EXIST:
255 return -EADDRINUSE;
256 default:
257 return -EPROTO;
258 }
259}
260
261static void efx_mcdi_read_response_header(struct efx_nic *efx)
262{
263 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
264 unsigned int respseq, respcmd, error;
265#ifdef CONFIG_SFC_MCDI_LOGGING
266 char *buf = mcdi->logging_buffer; /* page-sized */
267#endif
268 efx_dword_t hdr;
269
270 efx->type->mcdi_read_response(efx, &hdr, 0, 4);
271 respseq = EFX_DWORD_FIELD(hdr, MCDI_HEADER_SEQ);
272 respcmd = EFX_DWORD_FIELD(hdr, MCDI_HEADER_CODE);
273 error = EFX_DWORD_FIELD(hdr, MCDI_HEADER_ERROR);
274
275 if (respcmd != MC_CMD_V2_EXTN) {
276 mcdi->resp_hdr_len = 4;
277 mcdi->resp_data_len = EFX_DWORD_FIELD(hdr, MCDI_HEADER_DATALEN);
278 } else {
279 efx->type->mcdi_read_response(efx, &hdr, 4, 4);
280 mcdi->resp_hdr_len = 8;
281 mcdi->resp_data_len =
282 EFX_DWORD_FIELD(hdr, MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
283 }
284
285#ifdef CONFIG_SFC_MCDI_LOGGING
286 if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
287 size_t hdr_len, data_len;
288 int bytes = 0;
289 int i;
290
291 WARN_ON_ONCE(mcdi->resp_hdr_len % 4);
292 hdr_len = mcdi->resp_hdr_len / 4;
293 /* MCDI_DECLARE_BUF ensures that underlying buffer is padded
294 * to dword size, and the MCDI buffer is always dword size
295 */
296 data_len = DIV_ROUND_UP(mcdi->resp_data_len, 4);
297
298 /* We own the logging buffer, as only one MCDI can be in
299 * progress on a NIC at any one time. So no need for locking.
300 */
301 for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
302 efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4);
303 bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
304 " %08x", le32_to_cpu(hdr.u32[0]));
305 }
306
307 for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
308 efx->type->mcdi_read_response(efx, &hdr,
309 mcdi->resp_hdr_len + (i * 4), 4);
310 bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
311 " %08x", le32_to_cpu(hdr.u32[0]));
312 }
313
314 netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf);
315 }
316#endif
317
318 mcdi->resprc_raw = 0;
319 if (error && mcdi->resp_data_len == 0) {
320 netif_err(efx, hw, efx->net_dev, "MC rebooted\n");
321 mcdi->resprc = -EIO;
322 } else if ((respseq ^ mcdi->seqno) & SEQ_MASK) {
323 netif_err(efx, hw, efx->net_dev,
324 "MC response mismatch tx seq 0x%x rx seq 0x%x\n",
325 respseq, mcdi->seqno);
326 mcdi->resprc = -EIO;
327 } else if (error) {
328 efx->type->mcdi_read_response(efx, &hdr, mcdi->resp_hdr_len, 4);
329 mcdi->resprc_raw = EFX_DWORD_FIELD(hdr, EFX_DWORD_0);
330 mcdi->resprc = efx_mcdi_errno(mcdi->resprc_raw);
331 } else {
332 mcdi->resprc = 0;
333 }
334}
335
336static bool efx_mcdi_poll_once(struct efx_nic *efx)
337{
338 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
339
340 rmb();
341 if (!efx->type->mcdi_poll_response(efx))
342 return false;
343
344 spin_lock_bh(&mcdi->iface_lock);
345 efx_mcdi_read_response_header(efx);
346 spin_unlock_bh(&mcdi->iface_lock);
347
348 return true;
349}
350
351static int efx_mcdi_poll(struct efx_nic *efx)
352{
353 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
354 unsigned long time, finish;
355 unsigned int spins;
356 int rc;
357
358 /* Check for a reboot atomically with respect to efx_mcdi_copyout() */
359 rc = efx_mcdi_poll_reboot(efx);
360 if (rc) {
361 spin_lock_bh(&mcdi->iface_lock);
362 mcdi->resprc = rc;
363 mcdi->resp_hdr_len = 0;
364 mcdi->resp_data_len = 0;
365 spin_unlock_bh(&mcdi->iface_lock);
366 return 0;
367 }
368
369 /* Poll for completion. Poll quickly (once a us) for the 1st jiffy,
370 * because generally mcdi responses are fast. After that, back off
371 * and poll once a jiffy (approximately)
372 */
373 spins = TICK_USEC;
374 finish = jiffies + MCDI_RPC_TIMEOUT;
375
376 while (1) {
377 if (spins != 0) {
378 --spins;
379 udelay(1);
380 } else {
381 schedule_timeout_uninterruptible(1);
382 }
383
384 time = jiffies;
385
386 if (efx_mcdi_poll_once(efx))
387 break;
388
389 if (time_after(time, finish))
390 return -ETIMEDOUT;
391 }
392
393 /* Return rc=0 like wait_event_timeout() */
394 return 0;
395}
396
397/* Test and clear MC-rebooted flag for this port/function; reset
398 * software state as necessary.
399 */
400int efx_mcdi_poll_reboot(struct efx_nic *efx)
401{
402 if (!efx->mcdi)
403 return 0;
404
405 return efx->type->mcdi_poll_reboot(efx);
406}
407
408static bool efx_mcdi_acquire_async(struct efx_mcdi_iface *mcdi)
409{
410 return cmpxchg(&mcdi->state,
411 MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_ASYNC) ==
412 MCDI_STATE_QUIESCENT;
413}
414
415static void efx_mcdi_acquire_sync(struct efx_mcdi_iface *mcdi)
416{
417 /* Wait until the interface becomes QUIESCENT and we win the race
418 * to mark it RUNNING_SYNC.
419 */
420 wait_event(mcdi->wq,
421 cmpxchg(&mcdi->state,
422 MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_SYNC) ==
423 MCDI_STATE_QUIESCENT);
424}
425
426static int efx_mcdi_await_completion(struct efx_nic *efx)
427{
428 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
429
430 if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
431 MCDI_RPC_TIMEOUT) == 0)
432 return -ETIMEDOUT;
433
434 /* Check if efx_mcdi_set_mode() switched us back to polled completions.
435 * In which case, poll for completions directly. If efx_mcdi_ev_cpl()
436 * completed the request first, then we'll just end up completing the
437 * request again, which is safe.
438 *
439 * We need an smp_rmb() to synchronise with efx_mcdi_mode_poll(), which
440 * wait_event_timeout() implicitly provides.
441 */
442 if (mcdi->mode == MCDI_MODE_POLL)
443 return efx_mcdi_poll(efx);
444
445 return 0;
446}
447
448/* If the interface is RUNNING_SYNC, switch to COMPLETED and wake the
449 * requester. Return whether this was done. Does not take any locks.
450 */
451static bool efx_mcdi_complete_sync(struct efx_mcdi_iface *mcdi)
452{
453 if (cmpxchg(&mcdi->state,
454 MCDI_STATE_RUNNING_SYNC, MCDI_STATE_COMPLETED) ==
455 MCDI_STATE_RUNNING_SYNC) {
456 wake_up(&mcdi->wq);
457 return true;
458 }
459
460 return false;
461}
462
463static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
464{
465 if (mcdi->mode == MCDI_MODE_EVENTS) {
466 struct efx_mcdi_async_param *async;
467 struct efx_nic *efx = mcdi->efx;
468
469 /* Process the asynchronous request queue */
470 spin_lock_bh(&mcdi->async_lock);
471 async = list_first_entry_or_null(
472 &mcdi->async_list, struct efx_mcdi_async_param, list);
473 if (async) {
474 mcdi->state = MCDI_STATE_RUNNING_ASYNC;
475 efx_mcdi_send_request(efx, async->cmd,
476 (const efx_dword_t *)(async + 1),
477 async->inlen);
478 mod_timer(&mcdi->async_timer,
479 jiffies + MCDI_RPC_TIMEOUT);
480 }
481 spin_unlock_bh(&mcdi->async_lock);
482
483 if (async)
484 return;
485 }
486
487 mcdi->state = MCDI_STATE_QUIESCENT;
488 wake_up(&mcdi->wq);
489}
490
491/* If the interface is RUNNING_ASYNC, switch to COMPLETED, call the
492 * asynchronous completion function, and release the interface.
493 * Return whether this was done. Must be called in bh-disabled
494 * context. Will take iface_lock and async_lock.
495 */
496static bool efx_mcdi_complete_async(struct efx_mcdi_iface *mcdi, bool timeout)
497{
498 struct efx_nic *efx = mcdi->efx;
499 struct efx_mcdi_async_param *async;
500 size_t hdr_len, data_len, err_len;
501 efx_dword_t *outbuf;
502 MCDI_DECLARE_BUF_ERR(errbuf);
503 int rc;
504
505 if (cmpxchg(&mcdi->state,
506 MCDI_STATE_RUNNING_ASYNC, MCDI_STATE_COMPLETED) !=
507 MCDI_STATE_RUNNING_ASYNC)
508 return false;
509
510 spin_lock(&mcdi->iface_lock);
511 if (timeout) {
512 /* Ensure that if the completion event arrives later,
513 * the seqno check in efx_mcdi_ev_cpl() will fail
514 */
515 ++mcdi->seqno;
516 ++mcdi->credits;
517 rc = -ETIMEDOUT;
518 hdr_len = 0;
519 data_len = 0;
520 } else {
521 rc = mcdi->resprc;
522 hdr_len = mcdi->resp_hdr_len;
523 data_len = mcdi->resp_data_len;
524 }
525 spin_unlock(&mcdi->iface_lock);
526
527 /* Stop the timer. In case the timer function is running, we
528 * must wait for it to return so that there is no possibility
529 * of it aborting the next request.
530 */
531 if (!timeout)
532 del_timer_sync(&mcdi->async_timer);
533
534 spin_lock(&mcdi->async_lock);
535 async = list_first_entry(&mcdi->async_list,
536 struct efx_mcdi_async_param, list);
537 list_del(&async->list);
538 spin_unlock(&mcdi->async_lock);
539
540 outbuf = (efx_dword_t *)(async + 1);
541 efx->type->mcdi_read_response(efx, outbuf, hdr_len,
542 min(async->outlen, data_len));
543 if (!timeout && rc && !async->quiet) {
544 err_len = min(sizeof(errbuf), data_len);
545 efx->type->mcdi_read_response(efx, errbuf, hdr_len,
546 sizeof(errbuf));
547 efx_mcdi_display_error(efx, async->cmd, async->inlen, errbuf,
548 err_len, rc);
549 }
550
551 if (async->complete)
552 async->complete(efx, async->cookie, rc, outbuf,
553 min(async->outlen, data_len));
554 kfree(async);
555
556 efx_mcdi_release(mcdi);
557
558 return true;
559}
560
561static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
562 unsigned int datalen, unsigned int mcdi_err)
563{
564 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
565 bool wake = false;
566
567 spin_lock(&mcdi->iface_lock);
568
569 if ((seqno ^ mcdi->seqno) & SEQ_MASK) {
570 if (mcdi->credits)
571 /* The request has been cancelled */
572 --mcdi->credits;
573 else
574 netif_err(efx, hw, efx->net_dev,
575 "MC response mismatch tx seq 0x%x rx "
576 "seq 0x%x\n", seqno, mcdi->seqno);
577 } else {
578 if (efx->type->mcdi_max_ver >= 2) {
579 /* MCDI v2 responses don't fit in an event */
580 efx_mcdi_read_response_header(efx);
581 } else {
582 mcdi->resprc = efx_mcdi_errno(mcdi_err);
583 mcdi->resp_hdr_len = 4;
584 mcdi->resp_data_len = datalen;
585 }
586
587 wake = true;
588 }
589
590 spin_unlock(&mcdi->iface_lock);
591
592 if (wake) {
593 if (!efx_mcdi_complete_async(mcdi, false))
594 (void) efx_mcdi_complete_sync(mcdi);
595
596 /* If the interface isn't RUNNING_ASYNC or
597 * RUNNING_SYNC then we've received a duplicate
598 * completion after we've already transitioned back to
599 * QUIESCENT. [A subsequent invocation would increment
600 * seqno, so would have failed the seqno check].
601 */
602 }
603}
604
605static void efx_mcdi_timeout_async(unsigned long context)
606{
607 struct efx_mcdi_iface *mcdi = (struct efx_mcdi_iface *)context;
608
609 efx_mcdi_complete_async(mcdi, true);
610}
611
612static int
613efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
614{
615 if (efx->type->mcdi_max_ver < 0 ||
616 (efx->type->mcdi_max_ver < 2 &&
617 cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
618 return -EINVAL;
619
620 if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
621 (efx->type->mcdi_max_ver < 2 &&
622 inlen > MCDI_CTL_SDU_LEN_MAX_V1))
623 return -EMSGSIZE;
624
625 return 0;
626}
627
628static bool efx_mcdi_get_proxy_handle(struct efx_nic *efx,
629 size_t hdr_len, size_t data_len,
630 u32 *proxy_handle)
631{
632 MCDI_DECLARE_BUF_ERR(testbuf);
633 const size_t buflen = sizeof(testbuf);
634
635 if (!proxy_handle || data_len < buflen)
636 return false;
637
638 efx->type->mcdi_read_response(efx, testbuf, hdr_len, buflen);
639 if (MCDI_DWORD(testbuf, ERR_CODE) == MC_CMD_ERR_PROXY_PENDING) {
640 *proxy_handle = MCDI_DWORD(testbuf, ERR_PROXY_PENDING_HANDLE);
641 return true;
642 }
643
644 return false;
645}
646
647static int _efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned int cmd,
648 size_t inlen,
649 efx_dword_t *outbuf, size_t outlen,
650 size_t *outlen_actual, bool quiet,
651 u32 *proxy_handle, int *raw_rc)
652{
653 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
654 MCDI_DECLARE_BUF_ERR(errbuf);
655 int rc;
656
657 if (mcdi->mode == MCDI_MODE_POLL)
658 rc = efx_mcdi_poll(efx);
659 else
660 rc = efx_mcdi_await_completion(efx);
661
662 if (rc != 0) {
663 netif_err(efx, hw, efx->net_dev,
664 "MC command 0x%x inlen %d mode %d timed out\n",
665 cmd, (int)inlen, mcdi->mode);
666
667 if (mcdi->mode == MCDI_MODE_EVENTS && efx_mcdi_poll_once(efx)) {
668 netif_err(efx, hw, efx->net_dev,
669 "MCDI request was completed without an event\n");
670 rc = 0;
671 }
672
673 efx_mcdi_abandon(efx);
674
675 /* Close the race with efx_mcdi_ev_cpl() executing just too late
676 * and completing a request we've just cancelled, by ensuring
677 * that the seqno check therein fails.
678 */
679 spin_lock_bh(&mcdi->iface_lock);
680 ++mcdi->seqno;
681 ++mcdi->credits;
682 spin_unlock_bh(&mcdi->iface_lock);
683 }
684
685 if (proxy_handle)
686 *proxy_handle = 0;
687
688 if (rc != 0) {
689 if (outlen_actual)
690 *outlen_actual = 0;
691 } else {
692 size_t hdr_len, data_len, err_len;
693
694 /* At the very least we need a memory barrier here to ensure
695 * we pick up changes from efx_mcdi_ev_cpl(). Protect against
696 * a spurious efx_mcdi_ev_cpl() running concurrently by
697 * acquiring the iface_lock. */
698 spin_lock_bh(&mcdi->iface_lock);
699 rc = mcdi->resprc;
700 if (raw_rc)
701 *raw_rc = mcdi->resprc_raw;
702 hdr_len = mcdi->resp_hdr_len;
703 data_len = mcdi->resp_data_len;
704 err_len = min(sizeof(errbuf), data_len);
705 spin_unlock_bh(&mcdi->iface_lock);
706
707 BUG_ON(rc > 0);
708
709 efx->type->mcdi_read_response(efx, outbuf, hdr_len,
710 min(outlen, data_len));
711 if (outlen_actual)
712 *outlen_actual = data_len;
713
714 efx->type->mcdi_read_response(efx, errbuf, hdr_len, err_len);
715
716 if (cmd == MC_CMD_REBOOT && rc == -EIO) {
717 /* Don't reset if MC_CMD_REBOOT returns EIO */
718 } else if (rc == -EIO || rc == -EINTR) {
719 netif_err(efx, hw, efx->net_dev, "MC fatal error %d\n",
720 -rc);
721 efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
722 } else if (proxy_handle && (rc == -EPROTO) &&
723 efx_mcdi_get_proxy_handle(efx, hdr_len, data_len,
724 proxy_handle)) {
725 mcdi->proxy_rx_status = 0;
726 mcdi->proxy_rx_handle = 0;
727 mcdi->state = MCDI_STATE_PROXY_WAIT;
728 } else if (rc && !quiet) {
729 efx_mcdi_display_error(efx, cmd, inlen, errbuf, err_len,
730 rc);
731 }
732
733 if (rc == -EIO || rc == -EINTR) {
734 msleep(MCDI_STATUS_SLEEP_MS);
735 efx_mcdi_poll_reboot(efx);
736 mcdi->new_epoch = true;
737 }
738 }
739
740 if (!proxy_handle || !*proxy_handle)
741 efx_mcdi_release(mcdi);
742 return rc;
743}
744
745static void efx_mcdi_proxy_abort(struct efx_mcdi_iface *mcdi)
746{
747 if (mcdi->state == MCDI_STATE_PROXY_WAIT) {
748 /* Interrupt the proxy wait. */
749 mcdi->proxy_rx_status = -EINTR;
750 wake_up(&mcdi->proxy_rx_wq);
751 }
752}
753
754static void efx_mcdi_ev_proxy_response(struct efx_nic *efx,
755 u32 handle, int status)
756{
757 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
758
759 WARN_ON(mcdi->state != MCDI_STATE_PROXY_WAIT);
760
761 mcdi->proxy_rx_status = efx_mcdi_errno(status);
762 /* Ensure the status is written before we update the handle, since the
763 * latter is used to check if we've finished.
764 */
765 wmb();
766 mcdi->proxy_rx_handle = handle;
767 wake_up(&mcdi->proxy_rx_wq);
768}
769
770static int efx_mcdi_proxy_wait(struct efx_nic *efx, u32 handle, bool quiet)
771{
772 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
773 int rc;
774
775 /* Wait for a proxy event, or timeout. */
776 rc = wait_event_timeout(mcdi->proxy_rx_wq,
777 mcdi->proxy_rx_handle != 0 ||
778 mcdi->proxy_rx_status == -EINTR,
779 MCDI_RPC_TIMEOUT);
780
781 if (rc <= 0) {
782 netif_dbg(efx, hw, efx->net_dev,
783 "MCDI proxy timeout %d\n", handle);
784 return -ETIMEDOUT;
785 } else if (mcdi->proxy_rx_handle != handle) {
786 netif_warn(efx, hw, efx->net_dev,
787 "MCDI proxy unexpected handle %d (expected %d)\n",
788 mcdi->proxy_rx_handle, handle);
789 return -EINVAL;
790 }
791
792 return mcdi->proxy_rx_status;
793}
794
795static int _efx_mcdi_rpc(struct efx_nic *efx, unsigned int cmd,
796 const efx_dword_t *inbuf, size_t inlen,
797 efx_dword_t *outbuf, size_t outlen,
798 size_t *outlen_actual, bool quiet, int *raw_rc)
799{
800 u32 proxy_handle = 0; /* Zero is an invalid proxy handle. */
801 int rc;
802
803 if (inbuf && inlen && (inbuf == outbuf)) {
804 /* The input buffer can't be aliased with the output. */
805 WARN_ON(1);
806 return -EINVAL;
807 }
808
809 rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen);
810 if (rc)
811 return rc;
812
813 rc = _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
814 outlen_actual, quiet, &proxy_handle, raw_rc);
815
816 if (proxy_handle) {
817 /* Handle proxy authorisation. This allows approval of MCDI
818 * operations to be delegated to the admin function, allowing
819 * fine control over (eg) multicast subscriptions.
820 */
821 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
822
823 netif_dbg(efx, hw, efx->net_dev,
824 "MCDI waiting for proxy auth %d\n",
825 proxy_handle);
826 rc = efx_mcdi_proxy_wait(efx, proxy_handle, quiet);
827
828 if (rc == 0) {
829 netif_dbg(efx, hw, efx->net_dev,
830 "MCDI proxy retry %d\n", proxy_handle);
831
832 /* We now retry the original request. */
833 mcdi->state = MCDI_STATE_RUNNING_SYNC;
834 efx_mcdi_send_request(efx, cmd, inbuf, inlen);
835
836 rc = _efx_mcdi_rpc_finish(efx, cmd, inlen,
837 outbuf, outlen, outlen_actual,
838 quiet, NULL, raw_rc);
839 } else {
840 netif_printk(efx, hw,
841 rc == -EPERM ? KERN_DEBUG : KERN_ERR,
842 efx->net_dev,
843 "MC command 0x%x failed after proxy auth rc=%d\n",
844 cmd, rc);
845
846 if (rc == -EINTR || rc == -EIO)
847 efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
848 efx_mcdi_release(mcdi);
849 }
850 }
851
852 return rc;
853}
854
855static int _efx_mcdi_rpc_evb_retry(struct efx_nic *efx, unsigned cmd,
856 const efx_dword_t *inbuf, size_t inlen,
857 efx_dword_t *outbuf, size_t outlen,
858 size_t *outlen_actual, bool quiet)
859{
860 int raw_rc = 0;
861 int rc;
862
863 rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
864 outbuf, outlen, outlen_actual, true, &raw_rc);
865
866 if ((rc == -EPROTO) && (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
867 efx->type->is_vf) {
868 /* If the EVB port isn't available within a VF this may
869 * mean the PF is still bringing the switch up. We should
870 * retry our request shortly.
871 */
872 unsigned long abort_time = jiffies + MCDI_RPC_TIMEOUT;
873 unsigned int delay_us = 10000;
874
875 netif_dbg(efx, hw, efx->net_dev,
876 "%s: NO_EVB_PORT; will retry request\n",
877 __func__);
878
879 do {
880 usleep_range(delay_us, delay_us + 10000);
881 rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
882 outbuf, outlen, outlen_actual,
883 true, &raw_rc);
884 if (delay_us < 100000)
885 delay_us <<= 1;
886 } while ((rc == -EPROTO) &&
887 (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
888 time_before(jiffies, abort_time));
889 }
890
891 if (rc && !quiet && !(cmd == MC_CMD_REBOOT && rc == -EIO))
892 efx_mcdi_display_error(efx, cmd, inlen,
893 outbuf, outlen, rc);
894
895 return rc;
896}
897
898/**
899 * efx_mcdi_rpc - Issue an MCDI command and wait for completion
900 * @efx: NIC through which to issue the command
901 * @cmd: Command type number
902 * @inbuf: Command parameters
903 * @inlen: Length of command parameters, in bytes. Must be a multiple
904 * of 4 and no greater than %MCDI_CTL_SDU_LEN_MAX_V1.
905 * @outbuf: Response buffer. May be %NULL if @outlen is 0.
906 * @outlen: Length of response buffer, in bytes. If the actual
907 * response is longer than @outlen & ~3, it will be truncated
908 * to that length.
909 * @outlen_actual: Pointer through which to return the actual response
910 * length. May be %NULL if this is not needed.
911 *
912 * This function may sleep and therefore must be called in an appropriate
913 * context.
914 *
915 * Return: A negative error code, or zero if successful. The error
916 * code may come from the MCDI response or may indicate a failure
917 * to communicate with the MC. In the former case, the response
918 * will still be copied to @outbuf and *@outlen_actual will be
919 * set accordingly. In the latter case, *@outlen_actual will be
920 * set to zero.
921 */
922int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
923 const efx_dword_t *inbuf, size_t inlen,
924 efx_dword_t *outbuf, size_t outlen,
925 size_t *outlen_actual)
926{
927 return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
928 outlen_actual, false);
929}
930
931/* Normally, on receiving an error code in the MCDI response,
932 * efx_mcdi_rpc will log an error message containing (among other
933 * things) the raw error code, by means of efx_mcdi_display_error.
934 * This _quiet version suppresses that; if the caller wishes to log
935 * the error conditionally on the return code, it should call this
936 * function and is then responsible for calling efx_mcdi_display_error
937 * as needed.
938 */
939int efx_mcdi_rpc_quiet(struct efx_nic *efx, unsigned cmd,
940 const efx_dword_t *inbuf, size_t inlen,
941 efx_dword_t *outbuf, size_t outlen,
942 size_t *outlen_actual)
943{
944 return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
945 outlen_actual, true);
946}
947
948int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
949 const efx_dword_t *inbuf, size_t inlen)
950{
951 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
952 int rc;
953
954 rc = efx_mcdi_check_supported(efx, cmd, inlen);
955 if (rc)
956 return rc;
957
958 if (efx->mc_bist_for_other_fn)
959 return -ENETDOWN;
960
961 if (mcdi->mode == MCDI_MODE_FAIL)
962 return -ENETDOWN;
963
964 efx_mcdi_acquire_sync(mcdi);
965 efx_mcdi_send_request(efx, cmd, inbuf, inlen);
966 return 0;
967}
968
969static int _efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
970 const efx_dword_t *inbuf, size_t inlen,
971 size_t outlen,
972 efx_mcdi_async_completer *complete,
973 unsigned long cookie, bool quiet)
974{
975 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
976 struct efx_mcdi_async_param *async;
977 int rc;
978
979 rc = efx_mcdi_check_supported(efx, cmd, inlen);
980 if (rc)
981 return rc;
982
983 if (efx->mc_bist_for_other_fn)
984 return -ENETDOWN;
985
986 async = kmalloc(sizeof(*async) + ALIGN(max(inlen, outlen), 4),
987 GFP_ATOMIC);
988 if (!async)
989 return -ENOMEM;
990
991 async->cmd = cmd;
992 async->inlen = inlen;
993 async->outlen = outlen;
994 async->quiet = quiet;
995 async->complete = complete;
996 async->cookie = cookie;
997 memcpy(async + 1, inbuf, inlen);
998
999 spin_lock_bh(&mcdi->async_lock);
1000
1001 if (mcdi->mode == MCDI_MODE_EVENTS) {
1002 list_add_tail(&async->list, &mcdi->async_list);
1003
1004 /* If this is at the front of the queue, try to start it
1005 * immediately
1006 */
1007 if (mcdi->async_list.next == &async->list &&
1008 efx_mcdi_acquire_async(mcdi)) {
1009 efx_mcdi_send_request(efx, cmd, inbuf, inlen);
1010 mod_timer(&mcdi->async_timer,
1011 jiffies + MCDI_RPC_TIMEOUT);
1012 }
1013 } else {
1014 kfree(async);
1015 rc = -ENETDOWN;
1016 }
1017
1018 spin_unlock_bh(&mcdi->async_lock);
1019
1020 return rc;
1021}
1022
1023/**
1024 * efx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously
1025 * @efx: NIC through which to issue the command
1026 * @cmd: Command type number
1027 * @inbuf: Command parameters
1028 * @inlen: Length of command parameters, in bytes
1029 * @outlen: Length to allocate for response buffer, in bytes
1030 * @complete: Function to be called on completion or cancellation.
1031 * @cookie: Arbitrary value to be passed to @complete.
1032 *
1033 * This function does not sleep and therefore may be called in atomic
1034 * context. It will fail if event queues are disabled or if MCDI
1035 * event completions have been disabled due to an error.
1036 *
1037 * If it succeeds, the @complete function will be called exactly once
1038 * in atomic context, when one of the following occurs:
1039 * (a) the completion event is received (in NAPI context)
1040 * (b) event queues are disabled (in the process that disables them)
1041 * (c) the request times-out (in timer context)
1042 */
1043int
1044efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
1045 const efx_dword_t *inbuf, size_t inlen, size_t outlen,
1046 efx_mcdi_async_completer *complete, unsigned long cookie)
1047{
1048 return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1049 cookie, false);
1050}
1051
1052int efx_mcdi_rpc_async_quiet(struct efx_nic *efx, unsigned int cmd,
1053 const efx_dword_t *inbuf, size_t inlen,
1054 size_t outlen, efx_mcdi_async_completer *complete,
1055 unsigned long cookie)
1056{
1057 return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1058 cookie, true);
1059}
1060
1061int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen,
1062 efx_dword_t *outbuf, size_t outlen,
1063 size_t *outlen_actual)
1064{
1065 return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1066 outlen_actual, false, NULL, NULL);
1067}
1068
1069int efx_mcdi_rpc_finish_quiet(struct efx_nic *efx, unsigned cmd, size_t inlen,
1070 efx_dword_t *outbuf, size_t outlen,
1071 size_t *outlen_actual)
1072{
1073 return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1074 outlen_actual, true, NULL, NULL);
1075}
1076
1077void efx_mcdi_display_error(struct efx_nic *efx, unsigned cmd,
1078 size_t inlen, efx_dword_t *outbuf,
1079 size_t outlen, int rc)
1080{
1081 int code = 0, err_arg = 0;
1082
1083 if (outlen >= MC_CMD_ERR_CODE_OFST + 4)
1084 code = MCDI_DWORD(outbuf, ERR_CODE);
1085 if (outlen >= MC_CMD_ERR_ARG_OFST + 4)
1086 err_arg = MCDI_DWORD(outbuf, ERR_ARG);
1087 netif_printk(efx, hw, rc == -EPERM ? KERN_DEBUG : KERN_ERR,
1088 efx->net_dev,
1089 "MC command 0x%x inlen %zu failed rc=%d (raw=%d) arg=%d\n",
1090 cmd, inlen, rc, code, err_arg);
1091}
1092
1093/* Switch to polled MCDI completions. This can be called in various
1094 * error conditions with various locks held, so it must be lockless.
1095 * Caller is responsible for flushing asynchronous requests later.
1096 */
1097void efx_mcdi_mode_poll(struct efx_nic *efx)
1098{
1099 struct efx_mcdi_iface *mcdi;
1100
1101 if (!efx->mcdi)
1102 return;
1103
1104 mcdi = efx_mcdi(efx);
1105 /* If already in polling mode, nothing to do.
1106 * If in fail-fast state, don't switch to polled completion.
1107 * FLR recovery will do that later.
1108 */
1109 if (mcdi->mode == MCDI_MODE_POLL || mcdi->mode == MCDI_MODE_FAIL)
1110 return;
1111
1112 /* We can switch from event completion to polled completion, because
1113 * mcdi requests are always completed in shared memory. We do this by
1114 * switching the mode to POLL'd then completing the request.
1115 * efx_mcdi_await_completion() will then call efx_mcdi_poll().
1116 *
1117 * We need an smp_wmb() to synchronise with efx_mcdi_await_completion(),
1118 * which efx_mcdi_complete_sync() provides for us.
1119 */
1120 mcdi->mode = MCDI_MODE_POLL;
1121
1122 efx_mcdi_complete_sync(mcdi);
1123}
1124
1125/* Flush any running or queued asynchronous requests, after event processing
1126 * is stopped
1127 */
1128void efx_mcdi_flush_async(struct efx_nic *efx)
1129{
1130 struct efx_mcdi_async_param *async, *next;
1131 struct efx_mcdi_iface *mcdi;
1132
1133 if (!efx->mcdi)
1134 return;
1135
1136 mcdi = efx_mcdi(efx);
1137
1138 /* We must be in poll or fail mode so no more requests can be queued */
1139 BUG_ON(mcdi->mode == MCDI_MODE_EVENTS);
1140
1141 del_timer_sync(&mcdi->async_timer);
1142
1143 /* If a request is still running, make sure we give the MC
1144 * time to complete it so that the response won't overwrite our
1145 * next request.
1146 */
1147 if (mcdi->state == MCDI_STATE_RUNNING_ASYNC) {
1148 efx_mcdi_poll(efx);
1149 mcdi->state = MCDI_STATE_QUIESCENT;
1150 }
1151
1152 /* Nothing else will access the async list now, so it is safe
1153 * to walk it without holding async_lock. If we hold it while
1154 * calling a completer then lockdep may warn that we have
1155 * acquired locks in the wrong order.
1156 */
1157 list_for_each_entry_safe(async, next, &mcdi->async_list, list) {
1158 if (async->complete)
1159 async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
1160 list_del(&async->list);
1161 kfree(async);
1162 }
1163}
1164
1165void efx_mcdi_mode_event(struct efx_nic *efx)
1166{
1167 struct efx_mcdi_iface *mcdi;
1168
1169 if (!efx->mcdi)
1170 return;
1171
1172 mcdi = efx_mcdi(efx);
1173 /* If already in event completion mode, nothing to do.
1174 * If in fail-fast state, don't switch to event completion. FLR
1175 * recovery will do that later.
1176 */
1177 if (mcdi->mode == MCDI_MODE_EVENTS || mcdi->mode == MCDI_MODE_FAIL)
1178 return;
1179
1180 /* We can't switch from polled to event completion in the middle of a
1181 * request, because the completion method is specified in the request.
1182 * So acquire the interface to serialise the requestors. We don't need
1183 * to acquire the iface_lock to change the mode here, but we do need a
1184 * write memory barrier ensure that efx_mcdi_rpc() sees it, which
1185 * efx_mcdi_acquire() provides.
1186 */
1187 efx_mcdi_acquire_sync(mcdi);
1188 mcdi->mode = MCDI_MODE_EVENTS;
1189 efx_mcdi_release(mcdi);
1190}
1191
1192static void efx_mcdi_ev_death(struct efx_nic *efx, int rc)
1193{
1194 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1195
1196 /* If there is an outstanding MCDI request, it has been terminated
1197 * either by a BADASSERT or REBOOT event. If the mcdi interface is
1198 * in polled mode, then do nothing because the MC reboot handler will
1199 * set the header correctly. However, if the mcdi interface is waiting
1200 * for a CMDDONE event it won't receive it [and since all MCDI events
1201 * are sent to the same queue, we can't be racing with
1202 * efx_mcdi_ev_cpl()]
1203 *
1204 * If there is an outstanding asynchronous request, we can't
1205 * complete it now (efx_mcdi_complete() would deadlock). The
1206 * reset process will take care of this.
1207 *
1208 * There's a race here with efx_mcdi_send_request(), because
1209 * we might receive a REBOOT event *before* the request has
1210 * been copied out. In polled mode (during startup) this is
1211 * irrelevant, because efx_mcdi_complete_sync() is ignored. In
1212 * event mode, this condition is just an edge-case of
1213 * receiving a REBOOT event after posting the MCDI
1214 * request. Did the mc reboot before or after the copyout? The
1215 * best we can do always is just return failure.
1216 *
1217 * If there is an outstanding proxy response expected it is not going
1218 * to arrive. We should thus abort it.
1219 */
1220 spin_lock(&mcdi->iface_lock);
1221 efx_mcdi_proxy_abort(mcdi);
1222
1223 if (efx_mcdi_complete_sync(mcdi)) {
1224 if (mcdi->mode == MCDI_MODE_EVENTS) {
1225 mcdi->resprc = rc;
1226 mcdi->resp_hdr_len = 0;
1227 mcdi->resp_data_len = 0;
1228 ++mcdi->credits;
1229 }
1230 } else {
1231 int count;
1232
1233 /* Consume the status word since efx_mcdi_rpc_finish() won't */
1234 for (count = 0; count < MCDI_STATUS_DELAY_COUNT; ++count) {
1235 rc = efx_mcdi_poll_reboot(efx);
1236 if (rc)
1237 break;
1238 udelay(MCDI_STATUS_DELAY_US);
1239 }
1240
1241 /* On EF10, a CODE_MC_REBOOT event can be received without the
1242 * reboot detection in efx_mcdi_poll_reboot() being triggered.
1243 * If zero was returned from the final call to
1244 * efx_mcdi_poll_reboot(), the MC reboot wasn't noticed but the
1245 * MC has definitely rebooted so prepare for the reset.
1246 */
1247 if (!rc && efx->type->mcdi_reboot_detected)
1248 efx->type->mcdi_reboot_detected(efx);
1249
1250 mcdi->new_epoch = true;
1251
1252 /* Nobody was waiting for an MCDI request, so trigger a reset */
1253 efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
1254 }
1255
1256 spin_unlock(&mcdi->iface_lock);
1257}
1258
1259/* The MC is going down in to BIST mode. set the BIST flag to block
1260 * new MCDI, cancel any outstanding MCDI and and schedule a BIST-type reset
1261 * (which doesn't actually execute a reset, it waits for the controlling
1262 * function to reset it).
1263 */
1264static void efx_mcdi_ev_bist(struct efx_nic *efx)
1265{
1266 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1267
1268 spin_lock(&mcdi->iface_lock);
1269 efx->mc_bist_for_other_fn = true;
1270 efx_mcdi_proxy_abort(mcdi);
1271
1272 if (efx_mcdi_complete_sync(mcdi)) {
1273 if (mcdi->mode == MCDI_MODE_EVENTS) {
1274 mcdi->resprc = -EIO;
1275 mcdi->resp_hdr_len = 0;
1276 mcdi->resp_data_len = 0;
1277 ++mcdi->credits;
1278 }
1279 }
1280 mcdi->new_epoch = true;
1281 efx_schedule_reset(efx, RESET_TYPE_MC_BIST);
1282 spin_unlock(&mcdi->iface_lock);
1283}
1284
1285/* MCDI timeouts seen, so make all MCDI calls fail-fast and issue an FLR to try
1286 * to recover.
1287 */
1288static void efx_mcdi_abandon(struct efx_nic *efx)
1289{
1290 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1291
1292 if (xchg(&mcdi->mode, MCDI_MODE_FAIL) == MCDI_MODE_FAIL)
1293 return; /* it had already been done */
1294 netif_dbg(efx, hw, efx->net_dev, "MCDI is timing out; trying to recover\n");
1295 efx_schedule_reset(efx, RESET_TYPE_MCDI_TIMEOUT);
1296}
1297
1298/* Called from falcon_process_eventq for MCDI events */
1299void efx_mcdi_process_event(struct efx_channel *channel,
1300 efx_qword_t *event)
1301{
1302 struct efx_nic *efx = channel->efx;
1303 int code = EFX_QWORD_FIELD(*event, MCDI_EVENT_CODE);
1304 u32 data = EFX_QWORD_FIELD(*event, MCDI_EVENT_DATA);
1305
1306 switch (code) {
1307 case MCDI_EVENT_CODE_BADSSERT:
1308 netif_err(efx, hw, efx->net_dev,
1309 "MC watchdog or assertion failure at 0x%x\n", data);
1310 efx_mcdi_ev_death(efx, -EINTR);
1311 break;
1312
1313 case MCDI_EVENT_CODE_PMNOTICE:
1314 netif_info(efx, wol, efx->net_dev, "MCDI PM event.\n");
1315 break;
1316
1317 case MCDI_EVENT_CODE_CMDDONE:
1318 efx_mcdi_ev_cpl(efx,
1319 MCDI_EVENT_FIELD(*event, CMDDONE_SEQ),
1320 MCDI_EVENT_FIELD(*event, CMDDONE_DATALEN),
1321 MCDI_EVENT_FIELD(*event, CMDDONE_ERRNO));
1322 break;
1323
1324 case MCDI_EVENT_CODE_LINKCHANGE:
1325 efx_mcdi_process_link_change(efx, event);
1326 break;
1327 case MCDI_EVENT_CODE_SENSOREVT:
1328 efx_mcdi_sensor_event(efx, event);
1329 break;
1330 case MCDI_EVENT_CODE_SCHEDERR:
1331 netif_dbg(efx, hw, efx->net_dev,
1332 "MC Scheduler alert (0x%x)\n", data);
1333 break;
1334 case MCDI_EVENT_CODE_REBOOT:
1335 case MCDI_EVENT_CODE_MC_REBOOT:
1336 netif_info(efx, hw, efx->net_dev, "MC Reboot\n");
1337 efx_mcdi_ev_death(efx, -EIO);
1338 break;
1339 case MCDI_EVENT_CODE_MC_BIST:
1340 netif_info(efx, hw, efx->net_dev, "MC entered BIST mode\n");
1341 efx_mcdi_ev_bist(efx);
1342 break;
1343 case MCDI_EVENT_CODE_MAC_STATS_DMA:
1344 /* MAC stats are gather lazily. We can ignore this. */
1345 break;
1346 case MCDI_EVENT_CODE_FLR:
1347 if (efx->type->sriov_flr)
1348 efx->type->sriov_flr(efx,
1349 MCDI_EVENT_FIELD(*event, FLR_VF));
1350 break;
1351 case MCDI_EVENT_CODE_PTP_RX:
1352 case MCDI_EVENT_CODE_PTP_FAULT:
1353 case MCDI_EVENT_CODE_PTP_PPS:
1354 efx_ptp_event(efx, event);
1355 break;
1356 case MCDI_EVENT_CODE_PTP_TIME:
1357 efx_time_sync_event(channel, event);
1358 break;
1359 case MCDI_EVENT_CODE_TX_FLUSH:
1360 case MCDI_EVENT_CODE_RX_FLUSH:
1361 /* Two flush events will be sent: one to the same event
1362 * queue as completions, and one to event queue 0.
1363 * In the latter case the {RX,TX}_FLUSH_TO_DRIVER
1364 * flag will be set, and we should ignore the event
1365 * because we want to wait for all completions.
1366 */
1367 BUILD_BUG_ON(MCDI_EVENT_TX_FLUSH_TO_DRIVER_LBN !=
1368 MCDI_EVENT_RX_FLUSH_TO_DRIVER_LBN);
1369 if (!MCDI_EVENT_FIELD(*event, TX_FLUSH_TO_DRIVER))
1370 efx_ef10_handle_drain_event(efx);
1371 break;
1372 case MCDI_EVENT_CODE_TX_ERR:
1373 case MCDI_EVENT_CODE_RX_ERR:
1374 netif_err(efx, hw, efx->net_dev,
1375 "%s DMA error (event: "EFX_QWORD_FMT")\n",
1376 code == MCDI_EVENT_CODE_TX_ERR ? "TX" : "RX",
1377 EFX_QWORD_VAL(*event));
1378 efx_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
1379 break;
1380 case MCDI_EVENT_CODE_PROXY_RESPONSE:
1381 efx_mcdi_ev_proxy_response(efx,
1382 MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_HANDLE),
1383 MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_RC));
1384 break;
1385 default:
1386 netif_err(efx, hw, efx->net_dev, "Unknown MCDI event 0x%x\n",
1387 code);
1388 }
1389}
1390
1391/**************************************************************************
1392 *
1393 * Specific request functions
1394 *
1395 **************************************************************************
1396 */
1397
1398void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
1399{
1400 MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_VERSION_OUT_LEN);
1401 size_t outlength;
1402 const __le16 *ver_words;
1403 size_t offset;
1404 int rc;
1405
1406 BUILD_BUG_ON(MC_CMD_GET_VERSION_IN_LEN != 0);
1407 rc = efx_mcdi_rpc(efx, MC_CMD_GET_VERSION, NULL, 0,
1408 outbuf, sizeof(outbuf), &outlength);
1409 if (rc)
1410 goto fail;
1411 if (outlength < MC_CMD_GET_VERSION_OUT_LEN) {
1412 rc = -EIO;
1413 goto fail;
1414 }
1415
1416 ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION);
1417 offset = snprintf(buf, len, "%u.%u.%u.%u",
1418 le16_to_cpu(ver_words[0]), le16_to_cpu(ver_words[1]),
1419 le16_to_cpu(ver_words[2]), le16_to_cpu(ver_words[3]));
1420
1421 /* EF10 may have multiple datapath firmware variants within a
1422 * single version. Report which variants are running.
1423 */
1424 if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) {
1425 struct efx_ef10_nic_data *nic_data = efx->nic_data;
1426
1427 offset += snprintf(buf + offset, len - offset, " rx%x tx%x",
1428 nic_data->rx_dpcpu_fw_id,
1429 nic_data->tx_dpcpu_fw_id);
1430
1431 /* It's theoretically possible for the string to exceed 31
1432 * characters, though in practice the first three version
1433 * components are short enough that this doesn't happen.
1434 */
1435 if (WARN_ON(offset >= len))
1436 buf[0] = 0;
1437 }
1438
1439 return;
1440
1441fail:
1442 netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1443 buf[0] = 0;
1444}
1445
1446static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
1447 bool *was_attached)
1448{
1449 MCDI_DECLARE_BUF(inbuf, MC_CMD_DRV_ATTACH_IN_LEN);
1450 MCDI_DECLARE_BUF(outbuf, MC_CMD_DRV_ATTACH_EXT_OUT_LEN);
1451 size_t outlen;
1452 int rc;
1453
1454 MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_NEW_STATE,
1455 driver_operating ? 1 : 0);
1456 MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_UPDATE, 1);
1457 MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID, MC_CMD_FW_LOW_LATENCY);
1458
1459 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf, sizeof(inbuf),
1460 outbuf, sizeof(outbuf), &outlen);
1461 /* If we're not the primary PF, trying to ATTACH with a FIRMWARE_ID
1462 * specified will fail with EPERM, and we have to tell the MC we don't
1463 * care what firmware we get.
1464 */
1465 if (rc == -EPERM) {
1466 netif_dbg(efx, probe, efx->net_dev,
1467 "efx_mcdi_drv_attach with fw-variant setting failed EPERM, trying without it\n");
1468 MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID,
1469 MC_CMD_FW_DONT_CARE);
1470 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf,
1471 sizeof(inbuf), outbuf, sizeof(outbuf),
1472 &outlen);
1473 }
1474 if (rc) {
1475 efx_mcdi_display_error(efx, MC_CMD_DRV_ATTACH, sizeof(inbuf),
1476 outbuf, outlen, rc);
1477 goto fail;
1478 }
1479 if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN) {
1480 rc = -EIO;
1481 goto fail;
1482 }
1483
1484 if (driver_operating) {
1485 if (outlen >= MC_CMD_DRV_ATTACH_EXT_OUT_LEN) {
1486 efx->mcdi->fn_flags =
1487 MCDI_DWORD(outbuf,
1488 DRV_ATTACH_EXT_OUT_FUNC_FLAGS);
1489 } else {
1490 /* Synthesise flags for Siena */
1491 efx->mcdi->fn_flags =
1492 1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL |
1493 1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED |
1494 (efx_port_num(efx) == 0) <<
1495 MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY;
1496 }
1497 }
1498
1499 /* We currently assume we have control of the external link
1500 * and are completely trusted by firmware. Abort probing
1501 * if that's not true for this function.
1502 */
1503
1504 if (was_attached != NULL)
1505 *was_attached = MCDI_DWORD(outbuf, DRV_ATTACH_OUT_OLD_STATE);
1506 return 0;
1507
1508fail:
1509 netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1510 return rc;
1511}
1512
1513int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
1514 u16 *fw_subtype_list, u32 *capabilities)
1515{
1516 MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_BOARD_CFG_OUT_LENMAX);
1517 size_t outlen, i;
1518 int port_num = efx_port_num(efx);
1519 int rc;
1520
1521 BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_IN_LEN != 0);
1522 /* we need __aligned(2) for ether_addr_copy */
1523 BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0_OFST & 1);
1524 BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1_OFST & 1);
1525
1526 rc = efx_mcdi_rpc(efx, MC_CMD_GET_BOARD_CFG, NULL, 0,
1527 outbuf, sizeof(outbuf), &outlen);
1528 if (rc)
1529 goto fail;
1530
1531 if (outlen < MC_CMD_GET_BOARD_CFG_OUT_LENMIN) {
1532 rc = -EIO;
1533 goto fail;
1534 }
1535
1536 if (mac_address)
1537 ether_addr_copy(mac_address,
1538 port_num ?
1539 MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1) :
1540 MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0));
1541 if (fw_subtype_list) {
1542 for (i = 0;
1543 i < MCDI_VAR_ARRAY_LEN(outlen,
1544 GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST);
1545 i++)
1546 fw_subtype_list[i] = MCDI_ARRAY_WORD(
1547 outbuf, GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST, i);
1548 for (; i < MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM; i++)
1549 fw_subtype_list[i] = 0;
1550 }
1551 if (capabilities) {
1552 if (port_num)
1553 *capabilities = MCDI_DWORD(outbuf,
1554 GET_BOARD_CFG_OUT_CAPABILITIES_PORT1);
1555 else
1556 *capabilities = MCDI_DWORD(outbuf,
1557 GET_BOARD_CFG_OUT_CAPABILITIES_PORT0);
1558 }
1559
1560 return 0;
1561
1562fail:
1563 netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d len=%d\n",
1564 __func__, rc, (int)outlen);
1565
1566 return rc;
1567}
1568
1569int efx_mcdi_log_ctrl(struct efx_nic *efx, bool evq, bool uart, u32 dest_evq)
1570{
1571 MCDI_DECLARE_BUF(inbuf, MC_CMD_LOG_CTRL_IN_LEN);
1572 u32 dest = 0;
1573 int rc;
1574
1575 if (uart)
1576 dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_UART;
1577 if (evq)
1578 dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_EVQ;
1579
1580 MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST, dest);
1581 MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST_EVQ, dest_evq);
1582
1583 BUILD_BUG_ON(MC_CMD_LOG_CTRL_OUT_LEN != 0);
1584
1585 rc = efx_mcdi_rpc(efx, MC_CMD_LOG_CTRL, inbuf, sizeof(inbuf),
1586 NULL, 0, NULL);
1587 return rc;
1588}
1589
1590int efx_mcdi_nvram_types(struct efx_nic *efx, u32 *nvram_types_out)
1591{
1592 MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TYPES_OUT_LEN);
1593 size_t outlen;
1594 int rc;
1595
1596 BUILD_BUG_ON(MC_CMD_NVRAM_TYPES_IN_LEN != 0);
1597
1598 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TYPES, NULL, 0,
1599 outbuf, sizeof(outbuf), &outlen);
1600 if (rc)
1601 goto fail;
1602 if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN) {
1603 rc = -EIO;
1604 goto fail;
1605 }
1606
1607 *nvram_types_out = MCDI_DWORD(outbuf, NVRAM_TYPES_OUT_TYPES);
1608 return 0;
1609
1610fail:
1611 netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
1612 __func__, rc);
1613 return rc;
1614}
1615
1616int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
1617 size_t *size_out, size_t *erase_size_out,
1618 bool *protected_out)
1619{
1620 MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_INFO_IN_LEN);
1621 MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_INFO_OUT_LEN);
1622 size_t outlen;
1623 int rc;
1624
1625 MCDI_SET_DWORD(inbuf, NVRAM_INFO_IN_TYPE, type);
1626
1627 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_INFO, inbuf, sizeof(inbuf),
1628 outbuf, sizeof(outbuf), &outlen);
1629 if (rc)
1630 goto fail;
1631 if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN) {
1632 rc = -EIO;
1633 goto fail;
1634 }
1635
1636 *size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_SIZE);
1637 *erase_size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_ERASESIZE);
1638 *protected_out = !!(MCDI_DWORD(outbuf, NVRAM_INFO_OUT_FLAGS) &
1639 (1 << MC_CMD_NVRAM_INFO_OUT_PROTECTED_LBN));
1640 return 0;
1641
1642fail:
1643 netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1644 return rc;
1645}
1646
1647static int efx_mcdi_nvram_test(struct efx_nic *efx, unsigned int type)
1648{
1649 MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_TEST_IN_LEN);
1650 MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TEST_OUT_LEN);
1651 int rc;
1652
1653 MCDI_SET_DWORD(inbuf, NVRAM_TEST_IN_TYPE, type);
1654
1655 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TEST, inbuf, sizeof(inbuf),
1656 outbuf, sizeof(outbuf), NULL);
1657 if (rc)
1658 return rc;
1659
1660 switch (MCDI_DWORD(outbuf, NVRAM_TEST_OUT_RESULT)) {
1661 case MC_CMD_NVRAM_TEST_PASS:
1662 case MC_CMD_NVRAM_TEST_NOTSUPP:
1663 return 0;
1664 default:
1665 return -EIO;
1666 }
1667}
1668
1669int efx_mcdi_nvram_test_all(struct efx_nic *efx)
1670{
1671 u32 nvram_types;
1672 unsigned int type;
1673 int rc;
1674
1675 rc = efx_mcdi_nvram_types(efx, &nvram_types);
1676 if (rc)
1677 goto fail1;
1678
1679 type = 0;
1680 while (nvram_types != 0) {
1681 if (nvram_types & 1) {
1682 rc = efx_mcdi_nvram_test(efx, type);
1683 if (rc)
1684 goto fail2;
1685 }
1686 type++;
1687 nvram_types >>= 1;
1688 }
1689
1690 return 0;
1691
1692fail2:
1693 netif_err(efx, hw, efx->net_dev, "%s: failed type=%u\n",
1694 __func__, type);
1695fail1:
1696 netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1697 return rc;
1698}
1699
1700/* Returns 1 if an assertion was read, 0 if no assertion had fired,
1701 * negative on error.
1702 */
1703static int efx_mcdi_read_assertion(struct efx_nic *efx)
1704{
1705 MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_ASSERTS_IN_LEN);
1706 MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_ASSERTS_OUT_LEN);
1707 unsigned int flags, index;
1708 const char *reason;
1709 size_t outlen;
1710 int retry;
1711 int rc;
1712
1713 /* Attempt to read any stored assertion state before we reboot
1714 * the mcfw out of the assertion handler. Retry twice, once
1715 * because a boot-time assertion might cause this command to fail
1716 * with EINTR. And once again because GET_ASSERTS can race with
1717 * MC_CMD_REBOOT running on the other port. */
1718 retry = 2;
1719 do {
1720 MCDI_SET_DWORD(inbuf, GET_ASSERTS_IN_CLEAR, 1);
1721 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_GET_ASSERTS,
1722 inbuf, MC_CMD_GET_ASSERTS_IN_LEN,
1723 outbuf, sizeof(outbuf), &outlen);
1724 if (rc == -EPERM)
1725 return 0;
1726 } while ((rc == -EINTR || rc == -EIO) && retry-- > 0);
1727
1728 if (rc) {
1729 efx_mcdi_display_error(efx, MC_CMD_GET_ASSERTS,
1730 MC_CMD_GET_ASSERTS_IN_LEN, outbuf,
1731 outlen, rc);
1732 return rc;
1733 }
1734 if (outlen < MC_CMD_GET_ASSERTS_OUT_LEN)
1735 return -EIO;
1736
1737 /* Print out any recorded assertion state */
1738 flags = MCDI_DWORD(outbuf, GET_ASSERTS_OUT_GLOBAL_FLAGS);
1739 if (flags == MC_CMD_GET_ASSERTS_FLAGS_NO_FAILS)
1740 return 0;
1741
1742 reason = (flags == MC_CMD_GET_ASSERTS_FLAGS_SYS_FAIL)
1743 ? "system-level assertion"
1744 : (flags == MC_CMD_GET_ASSERTS_FLAGS_THR_FAIL)
1745 ? "thread-level assertion"
1746 : (flags == MC_CMD_GET_ASSERTS_FLAGS_WDOG_FIRED)
1747 ? "watchdog reset"
1748 : "unknown assertion";
1749 netif_err(efx, hw, efx->net_dev,
1750 "MCPU %s at PC = 0x%.8x in thread 0x%.8x\n", reason,
1751 MCDI_DWORD(outbuf, GET_ASSERTS_OUT_SAVED_PC_OFFS),
1752 MCDI_DWORD(outbuf, GET_ASSERTS_OUT_THREAD_OFFS));
1753
1754 /* Print out the registers */
1755 for (index = 0;
1756 index < MC_CMD_GET_ASSERTS_OUT_GP_REGS_OFFS_NUM;
1757 index++)
1758 netif_err(efx, hw, efx->net_dev, "R%.2d (?): 0x%.8x\n",
1759 1 + index,
1760 MCDI_ARRAY_DWORD(outbuf, GET_ASSERTS_OUT_GP_REGS_OFFS,
1761 index));
1762
1763 return 1;
1764}
1765
1766static int efx_mcdi_exit_assertion(struct efx_nic *efx)
1767{
1768 MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1769 int rc;
1770
1771 /* If the MC is running debug firmware, it might now be
1772 * waiting for a debugger to attach, but we just want it to
1773 * reboot. We set a flag that makes the command a no-op if it
1774 * has already done so.
1775 * The MCDI will thus return either 0 or -EIO.
1776 */
1777 BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1778 MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS,
1779 MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION);
1780 rc = efx_mcdi_rpc_quiet(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN,
1781 NULL, 0, NULL);
1782 if (rc == -EIO)
1783 rc = 0;
1784 if (rc)
1785 efx_mcdi_display_error(efx, MC_CMD_REBOOT, MC_CMD_REBOOT_IN_LEN,
1786 NULL, 0, rc);
1787 return rc;
1788}
1789
1790int efx_mcdi_handle_assertion(struct efx_nic *efx)
1791{
1792 int rc;
1793
1794 rc = efx_mcdi_read_assertion(efx);
1795 if (rc <= 0)
1796 return rc;
1797
1798 return efx_mcdi_exit_assertion(efx);
1799}
1800
1801void efx_mcdi_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
1802{
1803 MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_ID_LED_IN_LEN);
1804 int rc;
1805
1806 BUILD_BUG_ON(EFX_LED_OFF != MC_CMD_LED_OFF);
1807 BUILD_BUG_ON(EFX_LED_ON != MC_CMD_LED_ON);
1808 BUILD_BUG_ON(EFX_LED_DEFAULT != MC_CMD_LED_DEFAULT);
1809
1810 BUILD_BUG_ON(MC_CMD_SET_ID_LED_OUT_LEN != 0);
1811
1812 MCDI_SET_DWORD(inbuf, SET_ID_LED_IN_STATE, mode);
1813
1814 rc = efx_mcdi_rpc(efx, MC_CMD_SET_ID_LED, inbuf, sizeof(inbuf),
1815 NULL, 0, NULL);
1816}
1817
1818static int efx_mcdi_reset_func(struct efx_nic *efx)
1819{
1820 MCDI_DECLARE_BUF(inbuf, MC_CMD_ENTITY_RESET_IN_LEN);
1821 int rc;
1822
1823 BUILD_BUG_ON(MC_CMD_ENTITY_RESET_OUT_LEN != 0);
1824 MCDI_POPULATE_DWORD_1(inbuf, ENTITY_RESET_IN_FLAG,
1825 ENTITY_RESET_IN_FUNCTION_RESOURCE_RESET, 1);
1826 rc = efx_mcdi_rpc(efx, MC_CMD_ENTITY_RESET, inbuf, sizeof(inbuf),
1827 NULL, 0, NULL);
1828 return rc;
1829}
1830
1831static int efx_mcdi_reset_mc(struct efx_nic *efx)
1832{
1833 MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1834 int rc;
1835
1836 BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1837 MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS, 0);
1838 rc = efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, sizeof(inbuf),
1839 NULL, 0, NULL);
1840 /* White is black, and up is down */
1841 if (rc == -EIO)
1842 return 0;
1843 if (rc == 0)
1844 rc = -EIO;
1845 return rc;
1846}
1847
1848enum reset_type efx_mcdi_map_reset_reason(enum reset_type reason)
1849{
1850 return RESET_TYPE_RECOVER_OR_ALL;
1851}
1852
1853int efx_mcdi_reset(struct efx_nic *efx, enum reset_type method)
1854{
1855 int rc;
1856
1857 /* If MCDI is down, we can't handle_assertion */
1858 if (method == RESET_TYPE_MCDI_TIMEOUT) {
1859 rc = pci_reset_function(efx->pci_dev);
1860 if (rc)
1861 return rc;
1862 /* Re-enable polled MCDI completion */
1863 if (efx->mcdi) {
1864 struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1865 mcdi->mode = MCDI_MODE_POLL;
1866 }
1867 return 0;
1868 }
1869
1870 /* Recover from a failed assertion pre-reset */
1871 rc = efx_mcdi_handle_assertion(efx);
1872 if (rc)
1873 return rc;
1874
1875 if (method == RESET_TYPE_DATAPATH)
1876 return 0;
1877 else if (method == RESET_TYPE_WORLD)
1878 return efx_mcdi_reset_mc(efx);
1879 else
1880 return efx_mcdi_reset_func(efx);
1881}
1882
1883static int efx_mcdi_wol_filter_set(struct efx_nic *efx, u32 type,
1884 const u8 *mac, int *id_out)
1885{
1886 MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_SET_IN_LEN);
1887 MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_SET_OUT_LEN);
1888 size_t outlen;
1889 int rc;
1890
1891 MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_WOL_TYPE, type);
1892 MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_FILTER_MODE,
1893 MC_CMD_FILTER_MODE_SIMPLE);
1894 ether_addr_copy(MCDI_PTR(inbuf, WOL_FILTER_SET_IN_MAGIC_MAC), mac);
1895
1896 rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_SET, inbuf, sizeof(inbuf),
1897 outbuf, sizeof(outbuf), &outlen);
1898 if (rc)
1899 goto fail;
1900
1901 if (outlen < MC_CMD_WOL_FILTER_SET_OUT_LEN) {
1902 rc = -EIO;
1903 goto fail;
1904 }
1905
1906 *id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_SET_OUT_FILTER_ID);
1907
1908 return 0;
1909
1910fail:
1911 *id_out = -1;
1912 netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1913 return rc;
1914
1915}
1916
1917
1918int
1919efx_mcdi_wol_filter_set_magic(struct efx_nic *efx, const u8 *mac, int *id_out)
1920{
1921 return efx_mcdi_wol_filter_set(efx, MC_CMD_WOL_TYPE_MAGIC, mac, id_out);
1922}
1923
1924
1925int efx_mcdi_wol_filter_get_magic(struct efx_nic *efx, int *id_out)
1926{
1927 MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_GET_OUT_LEN);
1928 size_t outlen;
1929 int rc;
1930
1931 rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_GET, NULL, 0,
1932 outbuf, sizeof(outbuf), &outlen);
1933 if (rc)
1934 goto fail;
1935
1936 if (outlen < MC_CMD_WOL_FILTER_GET_OUT_LEN) {
1937 rc = -EIO;
1938 goto fail;
1939 }
1940
1941 *id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_GET_OUT_FILTER_ID);
1942
1943 return 0;
1944
1945fail:
1946 *id_out = -1;
1947 netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1948 return rc;
1949}
1950
1951
1952int efx_mcdi_wol_filter_remove(struct efx_nic *efx, int id)
1953{
1954 MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_REMOVE_IN_LEN);
1955 int rc;
1956
1957 MCDI_SET_DWORD(inbuf, WOL_FILTER_REMOVE_IN_FILTER_ID, (u32)id);
1958
1959 rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_REMOVE, inbuf, sizeof(inbuf),
1960 NULL, 0, NULL);
1961 return rc;
1962}
1963
1964int efx_mcdi_flush_rxqs(struct efx_nic *efx)
1965{
1966 struct efx_channel *channel;
1967 struct efx_rx_queue *rx_queue;
1968 MCDI_DECLARE_BUF(inbuf,
1969 MC_CMD_FLUSH_RX_QUEUES_IN_LEN(EFX_MAX_CHANNELS));
1970 int rc, count;
1971
1972 BUILD_BUG_ON(EFX_MAX_CHANNELS >
1973 MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);
1974
1975 count = 0;
1976 efx_for_each_channel(channel, efx) {
1977 efx_for_each_channel_rx_queue(rx_queue, channel) {
1978 if (rx_queue->flush_pending) {
1979 rx_queue->flush_pending = false;
1980 atomic_dec(&efx->rxq_flush_pending);
1981 MCDI_SET_ARRAY_DWORD(
1982 inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
1983 count, efx_rx_queue_index(rx_queue));
1984 count++;
1985 }
1986 }
1987 }
1988
1989 rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
1990 MC_CMD_FLUSH_RX_QUEUES_IN_LEN(count), NULL, 0, NULL);
1991 WARN_ON(rc < 0);
1992
1993 return rc;
1994}
1995
1996int efx_mcdi_wol_filter_reset(struct efx_nic *efx)
1997{
1998 int rc;
1999
2000 rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_RESET, NULL, 0, NULL, 0, NULL);
2001 return rc;
2002}
2003
2004int efx_mcdi_set_workaround(struct efx_nic *efx, u32 type, bool enabled,
2005 unsigned int *flags)
2006{
2007 MCDI_DECLARE_BUF(inbuf, MC_CMD_WORKAROUND_IN_LEN);
2008 MCDI_DECLARE_BUF(outbuf, MC_CMD_WORKAROUND_EXT_OUT_LEN);
2009 size_t outlen;
2010 int rc;
2011
2012 BUILD_BUG_ON(MC_CMD_WORKAROUND_OUT_LEN != 0);
2013 MCDI_SET_DWORD(inbuf, WORKAROUND_IN_TYPE, type);
2014 MCDI_SET_DWORD(inbuf, WORKAROUND_IN_ENABLED, enabled);
2015 rc = efx_mcdi_rpc(efx, MC_CMD_WORKAROUND, inbuf, sizeof(inbuf),
2016 outbuf, sizeof(outbuf), &outlen);
2017 if (rc)
2018 return rc;
2019
2020 if (!flags)
2021 return 0;
2022
2023 if (outlen >= MC_CMD_WORKAROUND_EXT_OUT_LEN)
2024 *flags = MCDI_DWORD(outbuf, WORKAROUND_EXT_OUT_FLAGS);
2025 else
2026 *flags = 0;
2027
2028 return 0;
2029}
2030
2031int efx_mcdi_get_workarounds(struct efx_nic *efx, unsigned int *impl_out,
2032 unsigned int *enabled_out)
2033{
2034 MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_WORKAROUNDS_OUT_LEN);
2035 size_t outlen;
2036 int rc;
2037
2038 rc = efx_mcdi_rpc(efx, MC_CMD_GET_WORKAROUNDS, NULL, 0,
2039 outbuf, sizeof(outbuf), &outlen);
2040 if (rc)
2041 goto fail;
2042
2043 if (outlen < MC_CMD_GET_WORKAROUNDS_OUT_LEN) {
2044 rc = -EIO;
2045 goto fail;
2046 }
2047
2048 if (impl_out)
2049 *impl_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_IMPLEMENTED);
2050
2051 if (enabled_out)
2052 *enabled_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_ENABLED);
2053
2054 return 0;
2055
2056fail:
2057 /* Older firmware lacks GET_WORKAROUNDS and this isn't especially
2058 * terrifying. The call site will have to deal with it though.
2059 */
2060 netif_printk(efx, hw, rc == -ENOSYS ? KERN_DEBUG : KERN_ERR,
2061 efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
2062 return rc;
2063}
2064
2065#ifdef CONFIG_SFC_MTD
2066
2067#define EFX_MCDI_NVRAM_LEN_MAX 128
2068
2069static int efx_mcdi_nvram_update_start(struct efx_nic *efx, unsigned int type)
2070{
2071 MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_START_IN_LEN);
2072 int rc;
2073
2074 MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_START_IN_TYPE, type);
2075
2076 BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_START_OUT_LEN != 0);
2077
2078 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_START, inbuf, sizeof(inbuf),
2079 NULL, 0, NULL);
2080 return rc;
2081}
2082
2083static int efx_mcdi_nvram_read(struct efx_nic *efx, unsigned int type,
2084 loff_t offset, u8 *buffer, size_t length)
2085{
2086 MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_READ_IN_LEN);
2087 MCDI_DECLARE_BUF(outbuf,
2088 MC_CMD_NVRAM_READ_OUT_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2089 size_t outlen;
2090 int rc;
2091
2092 MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_TYPE, type);
2093 MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_OFFSET, offset);
2094 MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_LENGTH, length);
2095
2096 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_READ, inbuf, sizeof(inbuf),
2097 outbuf, sizeof(outbuf), &outlen);
2098 if (rc)
2099 return rc;
2100
2101 memcpy(buffer, MCDI_PTR(outbuf, NVRAM_READ_OUT_READ_BUFFER), length);
2102 return 0;
2103}
2104
2105static int efx_mcdi_nvram_write(struct efx_nic *efx, unsigned int type,
2106 loff_t offset, const u8 *buffer, size_t length)
2107{
2108 MCDI_DECLARE_BUF(inbuf,
2109 MC_CMD_NVRAM_WRITE_IN_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2110 int rc;
2111
2112 MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_TYPE, type);
2113 MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_OFFSET, offset);
2114 MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_LENGTH, length);
2115 memcpy(MCDI_PTR(inbuf, NVRAM_WRITE_IN_WRITE_BUFFER), buffer, length);
2116
2117 BUILD_BUG_ON(MC_CMD_NVRAM_WRITE_OUT_LEN != 0);
2118
2119 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_WRITE, inbuf,
2120 ALIGN(MC_CMD_NVRAM_WRITE_IN_LEN(length), 4),
2121 NULL, 0, NULL);
2122 return rc;
2123}
2124
2125static int efx_mcdi_nvram_erase(struct efx_nic *efx, unsigned int type,
2126 loff_t offset, size_t length)
2127{
2128 MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_ERASE_IN_LEN);
2129 int rc;
2130
2131 MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_TYPE, type);
2132 MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_OFFSET, offset);
2133 MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_LENGTH, length);
2134
2135 BUILD_BUG_ON(MC_CMD_NVRAM_ERASE_OUT_LEN != 0);
2136
2137 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_ERASE, inbuf, sizeof(inbuf),
2138 NULL, 0, NULL);
2139 return rc;
2140}
2141
2142static int efx_mcdi_nvram_update_finish(struct efx_nic *efx, unsigned int type)
2143{
2144 MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_FINISH_IN_LEN);
2145 int rc;
2146
2147 MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_FINISH_IN_TYPE, type);
2148
2149 BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_FINISH_OUT_LEN != 0);
2150
2151 rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_FINISH, inbuf, sizeof(inbuf),
2152 NULL, 0, NULL);
2153 return rc;
2154}
2155
2156int efx_mcdi_mtd_read(struct mtd_info *mtd, loff_t start,
2157 size_t len, size_t *retlen, u8 *buffer)
2158{
2159 struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2160 struct efx_nic *efx = mtd->priv;
2161 loff_t offset = start;
2162 loff_t end = min_t(loff_t, start + len, mtd->size);
2163 size_t chunk;
2164 int rc = 0;
2165
2166 while (offset < end) {
2167 chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2168 rc = efx_mcdi_nvram_read(efx, part->nvram_type, offset,
2169 buffer, chunk);
2170 if (rc)
2171 goto out;
2172 offset += chunk;
2173 buffer += chunk;
2174 }
2175out:
2176 *retlen = offset - start;
2177 return rc;
2178}
2179
2180int efx_mcdi_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
2181{
2182 struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2183 struct efx_nic *efx = mtd->priv;
2184 loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
2185 loff_t end = min_t(loff_t, start + len, mtd->size);
2186 size_t chunk = part->common.mtd.erasesize;
2187 int rc = 0;
2188
2189 if (!part->updating) {
2190 rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2191 if (rc)
2192 goto out;
2193 part->updating = true;
2194 }
2195
2196 /* The MCDI interface can in fact do multiple erase blocks at once;
2197 * but erasing may be slow, so we make multiple calls here to avoid
2198 * tripping the MCDI RPC timeout. */
2199 while (offset < end) {
2200 rc = efx_mcdi_nvram_erase(efx, part->nvram_type, offset,
2201 chunk);
2202 if (rc)
2203 goto out;
2204 offset += chunk;
2205 }
2206out:
2207 return rc;
2208}
2209
2210int efx_mcdi_mtd_write(struct mtd_info *mtd, loff_t start,
2211 size_t len, size_t *retlen, const u8 *buffer)
2212{
2213 struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2214 struct efx_nic *efx = mtd->priv;
2215 loff_t offset = start;
2216 loff_t end = min_t(loff_t, start + len, mtd->size);
2217 size_t chunk;
2218 int rc = 0;
2219
2220 if (!part->updating) {
2221 rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2222 if (rc)
2223 goto out;
2224 part->updating = true;
2225 }
2226
2227 while (offset < end) {
2228 chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2229 rc = efx_mcdi_nvram_write(efx, part->nvram_type, offset,
2230 buffer, chunk);
2231 if (rc)
2232 goto out;
2233 offset += chunk;
2234 buffer += chunk;
2235 }
2236out:
2237 *retlen = offset - start;
2238 return rc;
2239}
2240
2241int efx_mcdi_mtd_sync(struct mtd_info *mtd)
2242{
2243 struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2244 struct efx_nic *efx = mtd->priv;
2245 int rc = 0;
2246
2247 if (part->updating) {
2248 part->updating = false;
2249 rc = efx_mcdi_nvram_update_finish(efx, part->nvram_type);
2250 }
2251
2252 return rc;
2253}
2254
2255void efx_mcdi_mtd_rename(struct efx_mtd_partition *part)
2256{
2257 struct efx_mcdi_mtd_partition *mcdi_part =
2258 container_of(part, struct efx_mcdi_mtd_partition, common);
2259 struct efx_nic *efx = part->mtd.priv;
2260
2261 snprintf(part->name, sizeof(part->name), "%s %s:%02x",
2262 efx->name, part->type_name, mcdi_part->fw_subtype);
2263}
2264
2265#endif /* CONFIG_SFC_MTD */