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(struct timer_list *t);
  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	timer_setup(&mcdi->async_timer, efx_mcdi_timeout_async, 0);
  91
  92	(void) efx_mcdi_poll_reboot(efx);
  93	mcdi->new_epoch = true;
  94
  95	/* Recover from a failed assertion before probing */
  96	rc = efx_mcdi_handle_assertion(efx);
  97	if (rc)
  98		goto fail2;
  99
 100	/* Let the MC (and BMC, if this is a LOM) know that the driver
 101	 * is loaded. We should do this before we reset the NIC.
 102	 */
 103	rc = efx_mcdi_drv_attach(efx, true, &already_attached);
 104	if (rc) {
 105		netif_err(efx, probe, efx->net_dev,
 106			  "Unable to register driver with MCPU\n");
 107		goto fail2;
 108	}
 109	if (already_attached)
 110		/* Not a fatal error */
 111		netif_err(efx, probe, efx->net_dev,
 112			  "Host already registered with MCPU\n");
 113
 114	if (efx->mcdi->fn_flags &
 115	    (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY))
 116		efx->primary = efx;
 117
 118	return 0;
 119fail2:
 120#ifdef CONFIG_SFC_MCDI_LOGGING
 121	free_page((unsigned long)mcdi->logging_buffer);
 122fail1:
 123#endif
 124	kfree(efx->mcdi);
 125	efx->mcdi = NULL;
 126fail:
 127	return rc;
 128}
 129
 130void efx_mcdi_detach(struct efx_nic *efx)
 131{
 132	if (!efx->mcdi)
 133		return;
 134
 135	BUG_ON(efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);
 136
 137	/* Relinquish the device (back to the BMC, if this is a LOM) */
 138	efx_mcdi_drv_attach(efx, false, NULL);
 139}
 140
 141void efx_mcdi_fini(struct efx_nic *efx)
 142{
 143	if (!efx->mcdi)
 144		return;
 145
 146#ifdef CONFIG_SFC_MCDI_LOGGING
 147	free_page((unsigned long)efx->mcdi->iface.logging_buffer);
 148#endif
 149
 150	kfree(efx->mcdi);
 151}
 152
 153static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
 154				  const efx_dword_t *inbuf, size_t inlen)
 155{
 156	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 157#ifdef CONFIG_SFC_MCDI_LOGGING
 158	char *buf = mcdi->logging_buffer; /* page-sized */
 159#endif
 160	efx_dword_t hdr[2];
 161	size_t hdr_len;
 162	u32 xflags, seqno;
 163
 164	BUG_ON(mcdi->state == MCDI_STATE_QUIESCENT);
 165
 166	/* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
 167	spin_lock_bh(&mcdi->iface_lock);
 168	++mcdi->seqno;
 
 169	spin_unlock_bh(&mcdi->iface_lock);
 170
 171	seqno = mcdi->seqno & SEQ_MASK;
 172	xflags = 0;
 173	if (mcdi->mode == MCDI_MODE_EVENTS)
 174		xflags |= MCDI_HEADER_XFLAGS_EVREQ;
 175
 176	if (efx->type->mcdi_max_ver == 1) {
 177		/* MCDI v1 */
 178		EFX_POPULATE_DWORD_7(hdr[0],
 179				     MCDI_HEADER_RESPONSE, 0,
 180				     MCDI_HEADER_RESYNC, 1,
 181				     MCDI_HEADER_CODE, cmd,
 182				     MCDI_HEADER_DATALEN, inlen,
 183				     MCDI_HEADER_SEQ, seqno,
 184				     MCDI_HEADER_XFLAGS, xflags,
 185				     MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
 186		hdr_len = 4;
 187	} else {
 188		/* MCDI v2 */
 189		BUG_ON(inlen > MCDI_CTL_SDU_LEN_MAX_V2);
 190		EFX_POPULATE_DWORD_7(hdr[0],
 191				     MCDI_HEADER_RESPONSE, 0,
 192				     MCDI_HEADER_RESYNC, 1,
 193				     MCDI_HEADER_CODE, MC_CMD_V2_EXTN,
 194				     MCDI_HEADER_DATALEN, 0,
 195				     MCDI_HEADER_SEQ, seqno,
 196				     MCDI_HEADER_XFLAGS, xflags,
 197				     MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
 198		EFX_POPULATE_DWORD_2(hdr[1],
 199				     MC_CMD_V2_EXTN_IN_EXTENDED_CMD, cmd,
 200				     MC_CMD_V2_EXTN_IN_ACTUAL_LEN, inlen);
 201		hdr_len = 8;
 202	}
 203
 204#ifdef CONFIG_SFC_MCDI_LOGGING
 205	if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
 206		int bytes = 0;
 207		int i;
 208		/* Lengths should always be a whole number of dwords, so scream
 209		 * if they're not.
 210		 */
 211		WARN_ON_ONCE(hdr_len % 4);
 212		WARN_ON_ONCE(inlen % 4);
 213
 214		/* We own the logging buffer, as only one MCDI can be in
 215		 * progress on a NIC at any one time.  So no need for locking.
 216		 */
 217		for (i = 0; i < hdr_len / 4 && bytes < PAGE_SIZE; i++)
 218			bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 219					  " %08x", le32_to_cpu(hdr[i].u32[0]));
 
 220
 221		for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++)
 222			bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 223					  " %08x", le32_to_cpu(inbuf[i].u32[0]));
 
 224
 225		netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
 226	}
 227#endif
 228
 229	efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);
 230
 231	mcdi->new_epoch = false;
 232}
 233
 234static int efx_mcdi_errno(unsigned int mcdi_err)
 235{
 236	switch (mcdi_err) {
 237	case 0:
 238		return 0;
 239#define TRANSLATE_ERROR(name)					\
 240	case MC_CMD_ERR_ ## name:				\
 241		return -name;
 242	TRANSLATE_ERROR(EPERM);
 243	TRANSLATE_ERROR(ENOENT);
 244	TRANSLATE_ERROR(EINTR);
 245	TRANSLATE_ERROR(EAGAIN);
 246	TRANSLATE_ERROR(EACCES);
 247	TRANSLATE_ERROR(EBUSY);
 248	TRANSLATE_ERROR(EINVAL);
 249	TRANSLATE_ERROR(EDEADLK);
 250	TRANSLATE_ERROR(ENOSYS);
 251	TRANSLATE_ERROR(ETIME);
 252	TRANSLATE_ERROR(EALREADY);
 253	TRANSLATE_ERROR(ENOSPC);
 254#undef TRANSLATE_ERROR
 255	case MC_CMD_ERR_ENOTSUP:
 256		return -EOPNOTSUPP;
 257	case MC_CMD_ERR_ALLOC_FAIL:
 258		return -ENOBUFS;
 259	case MC_CMD_ERR_MAC_EXIST:
 260		return -EADDRINUSE;
 261	default:
 262		return -EPROTO;
 263	}
 264}
 265
 266static void efx_mcdi_read_response_header(struct efx_nic *efx)
 267{
 268	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 269	unsigned int respseq, respcmd, error;
 270#ifdef CONFIG_SFC_MCDI_LOGGING
 271	char *buf = mcdi->logging_buffer; /* page-sized */
 272#endif
 273	efx_dword_t hdr;
 274
 275	efx->type->mcdi_read_response(efx, &hdr, 0, 4);
 276	respseq = EFX_DWORD_FIELD(hdr, MCDI_HEADER_SEQ);
 277	respcmd = EFX_DWORD_FIELD(hdr, MCDI_HEADER_CODE);
 278	error = EFX_DWORD_FIELD(hdr, MCDI_HEADER_ERROR);
 279
 280	if (respcmd != MC_CMD_V2_EXTN) {
 281		mcdi->resp_hdr_len = 4;
 282		mcdi->resp_data_len = EFX_DWORD_FIELD(hdr, MCDI_HEADER_DATALEN);
 283	} else {
 284		efx->type->mcdi_read_response(efx, &hdr, 4, 4);
 285		mcdi->resp_hdr_len = 8;
 286		mcdi->resp_data_len =
 287			EFX_DWORD_FIELD(hdr, MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
 288	}
 289
 290#ifdef CONFIG_SFC_MCDI_LOGGING
 291	if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
 292		size_t hdr_len, data_len;
 293		int bytes = 0;
 294		int i;
 295
 296		WARN_ON_ONCE(mcdi->resp_hdr_len % 4);
 297		hdr_len = mcdi->resp_hdr_len / 4;
 298		/* MCDI_DECLARE_BUF ensures that underlying buffer is padded
 299		 * to dword size, and the MCDI buffer is always dword size
 300		 */
 301		data_len = DIV_ROUND_UP(mcdi->resp_data_len, 4);
 302
 303		/* We own the logging buffer, as only one MCDI can be in
 304		 * progress on a NIC at any one time.  So no need for locking.
 305		 */
 306		for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
 307			efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4);
 308			bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 309					  " %08x", le32_to_cpu(hdr.u32[0]));
 310		}
 311
 312		for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
 313			efx->type->mcdi_read_response(efx, &hdr,
 314					mcdi->resp_hdr_len + (i * 4), 4);
 315			bytes += snprintf(buf + bytes, PAGE_SIZE - bytes,
 316					  " %08x", le32_to_cpu(hdr.u32[0]));
 317		}
 318
 319		netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf);
 320	}
 321#endif
 322
 323	mcdi->resprc_raw = 0;
 324	if (error && mcdi->resp_data_len == 0) {
 325		netif_err(efx, hw, efx->net_dev, "MC rebooted\n");
 326		mcdi->resprc = -EIO;
 327	} else if ((respseq ^ mcdi->seqno) & SEQ_MASK) {
 328		netif_err(efx, hw, efx->net_dev,
 329			  "MC response mismatch tx seq 0x%x rx seq 0x%x\n",
 330			  respseq, mcdi->seqno);
 331		mcdi->resprc = -EIO;
 332	} else if (error) {
 333		efx->type->mcdi_read_response(efx, &hdr, mcdi->resp_hdr_len, 4);
 334		mcdi->resprc_raw = EFX_DWORD_FIELD(hdr, EFX_DWORD_0);
 335		mcdi->resprc = efx_mcdi_errno(mcdi->resprc_raw);
 336	} else {
 337		mcdi->resprc = 0;
 338	}
 339}
 340
 341static bool efx_mcdi_poll_once(struct efx_nic *efx)
 342{
 343	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 344
 345	rmb();
 346	if (!efx->type->mcdi_poll_response(efx))
 347		return false;
 348
 349	spin_lock_bh(&mcdi->iface_lock);
 350	efx_mcdi_read_response_header(efx);
 351	spin_unlock_bh(&mcdi->iface_lock);
 352
 353	return true;
 354}
 355
 356static int efx_mcdi_poll(struct efx_nic *efx)
 357{
 358	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 359	unsigned long time, finish;
 360	unsigned int spins;
 361	int rc;
 362
 363	/* Check for a reboot atomically with respect to efx_mcdi_copyout() */
 364	rc = efx_mcdi_poll_reboot(efx);
 365	if (rc) {
 366		spin_lock_bh(&mcdi->iface_lock);
 367		mcdi->resprc = rc;
 368		mcdi->resp_hdr_len = 0;
 369		mcdi->resp_data_len = 0;
 370		spin_unlock_bh(&mcdi->iface_lock);
 371		return 0;
 372	}
 373
 374	/* Poll for completion. Poll quickly (once a us) for the 1st jiffy,
 375	 * because generally mcdi responses are fast. After that, back off
 376	 * and poll once a jiffy (approximately)
 377	 */
 378	spins = USER_TICK_USEC;
 379	finish = jiffies + MCDI_RPC_TIMEOUT;
 380
 381	while (1) {
 382		if (spins != 0) {
 383			--spins;
 384			udelay(1);
 385		} else {
 386			schedule_timeout_uninterruptible(1);
 387		}
 388
 389		time = jiffies;
 390
 391		if (efx_mcdi_poll_once(efx))
 392			break;
 393
 394		if (time_after(time, finish))
 395			return -ETIMEDOUT;
 396	}
 397
 398	/* Return rc=0 like wait_event_timeout() */
 399	return 0;
 400}
 401
 402/* Test and clear MC-rebooted flag for this port/function; reset
 403 * software state as necessary.
 404 */
 405int efx_mcdi_poll_reboot(struct efx_nic *efx)
 406{
 407	if (!efx->mcdi)
 408		return 0;
 409
 410	return efx->type->mcdi_poll_reboot(efx);
 411}
 412
 413static bool efx_mcdi_acquire_async(struct efx_mcdi_iface *mcdi)
 414{
 415	return cmpxchg(&mcdi->state,
 416		       MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_ASYNC) ==
 417		MCDI_STATE_QUIESCENT;
 418}
 419
 420static void efx_mcdi_acquire_sync(struct efx_mcdi_iface *mcdi)
 421{
 422	/* Wait until the interface becomes QUIESCENT and we win the race
 423	 * to mark it RUNNING_SYNC.
 424	 */
 425	wait_event(mcdi->wq,
 426		   cmpxchg(&mcdi->state,
 427			   MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_SYNC) ==
 428		   MCDI_STATE_QUIESCENT);
 429}
 430
 431static int efx_mcdi_await_completion(struct efx_nic *efx)
 432{
 433	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 434
 435	if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
 436			       MCDI_RPC_TIMEOUT) == 0)
 437		return -ETIMEDOUT;
 438
 439	/* Check if efx_mcdi_set_mode() switched us back to polled completions.
 440	 * In which case, poll for completions directly. If efx_mcdi_ev_cpl()
 441	 * completed the request first, then we'll just end up completing the
 442	 * request again, which is safe.
 443	 *
 444	 * We need an smp_rmb() to synchronise with efx_mcdi_mode_poll(), which
 445	 * wait_event_timeout() implicitly provides.
 446	 */
 447	if (mcdi->mode == MCDI_MODE_POLL)
 448		return efx_mcdi_poll(efx);
 449
 450	return 0;
 451}
 452
 453/* If the interface is RUNNING_SYNC, switch to COMPLETED and wake the
 454 * requester.  Return whether this was done.  Does not take any locks.
 455 */
 456static bool efx_mcdi_complete_sync(struct efx_mcdi_iface *mcdi)
 457{
 458	if (cmpxchg(&mcdi->state,
 459		    MCDI_STATE_RUNNING_SYNC, MCDI_STATE_COMPLETED) ==
 460	    MCDI_STATE_RUNNING_SYNC) {
 461		wake_up(&mcdi->wq);
 462		return true;
 463	}
 464
 465	return false;
 466}
 467
 468static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
 469{
 470	if (mcdi->mode == MCDI_MODE_EVENTS) {
 471		struct efx_mcdi_async_param *async;
 472		struct efx_nic *efx = mcdi->efx;
 473
 474		/* Process the asynchronous request queue */
 475		spin_lock_bh(&mcdi->async_lock);
 476		async = list_first_entry_or_null(
 477			&mcdi->async_list, struct efx_mcdi_async_param, list);
 478		if (async) {
 479			mcdi->state = MCDI_STATE_RUNNING_ASYNC;
 480			efx_mcdi_send_request(efx, async->cmd,
 481					      (const efx_dword_t *)(async + 1),
 482					      async->inlen);
 483			mod_timer(&mcdi->async_timer,
 484				  jiffies + MCDI_RPC_TIMEOUT);
 485		}
 486		spin_unlock_bh(&mcdi->async_lock);
 487
 488		if (async)
 489			return;
 490	}
 491
 492	mcdi->state = MCDI_STATE_QUIESCENT;
 493	wake_up(&mcdi->wq);
 494}
 495
 496/* If the interface is RUNNING_ASYNC, switch to COMPLETED, call the
 497 * asynchronous completion function, and release the interface.
 498 * Return whether this was done.  Must be called in bh-disabled
 499 * context.  Will take iface_lock and async_lock.
 500 */
 501static bool efx_mcdi_complete_async(struct efx_mcdi_iface *mcdi, bool timeout)
 502{
 503	struct efx_nic *efx = mcdi->efx;
 504	struct efx_mcdi_async_param *async;
 505	size_t hdr_len, data_len, err_len;
 506	efx_dword_t *outbuf;
 507	MCDI_DECLARE_BUF_ERR(errbuf);
 508	int rc;
 509
 510	if (cmpxchg(&mcdi->state,
 511		    MCDI_STATE_RUNNING_ASYNC, MCDI_STATE_COMPLETED) !=
 512	    MCDI_STATE_RUNNING_ASYNC)
 513		return false;
 514
 515	spin_lock(&mcdi->iface_lock);
 516	if (timeout) {
 517		/* Ensure that if the completion event arrives later,
 518		 * the seqno check in efx_mcdi_ev_cpl() will fail
 519		 */
 520		++mcdi->seqno;
 521		++mcdi->credits;
 522		rc = -ETIMEDOUT;
 523		hdr_len = 0;
 524		data_len = 0;
 525	} else {
 526		rc = mcdi->resprc;
 527		hdr_len = mcdi->resp_hdr_len;
 528		data_len = mcdi->resp_data_len;
 529	}
 530	spin_unlock(&mcdi->iface_lock);
 531
 532	/* Stop the timer.  In case the timer function is running, we
 533	 * must wait for it to return so that there is no possibility
 534	 * of it aborting the next request.
 535	 */
 536	if (!timeout)
 537		del_timer_sync(&mcdi->async_timer);
 538
 539	spin_lock(&mcdi->async_lock);
 540	async = list_first_entry(&mcdi->async_list,
 541				 struct efx_mcdi_async_param, list);
 542	list_del(&async->list);
 543	spin_unlock(&mcdi->async_lock);
 544
 545	outbuf = (efx_dword_t *)(async + 1);
 546	efx->type->mcdi_read_response(efx, outbuf, hdr_len,
 547				      min(async->outlen, data_len));
 548	if (!timeout && rc && !async->quiet) {
 549		err_len = min(sizeof(errbuf), data_len);
 550		efx->type->mcdi_read_response(efx, errbuf, hdr_len,
 551					      sizeof(errbuf));
 552		efx_mcdi_display_error(efx, async->cmd, async->inlen, errbuf,
 553				       err_len, rc);
 554	}
 555
 556	if (async->complete)
 557		async->complete(efx, async->cookie, rc, outbuf,
 558				min(async->outlen, data_len));
 559	kfree(async);
 560
 561	efx_mcdi_release(mcdi);
 562
 563	return true;
 564}
 565
 566static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
 567			    unsigned int datalen, unsigned int mcdi_err)
 568{
 569	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 570	bool wake = false;
 571
 572	spin_lock(&mcdi->iface_lock);
 573
 574	if ((seqno ^ mcdi->seqno) & SEQ_MASK) {
 575		if (mcdi->credits)
 576			/* The request has been cancelled */
 577			--mcdi->credits;
 578		else
 579			netif_err(efx, hw, efx->net_dev,
 580				  "MC response mismatch tx seq 0x%x rx "
 581				  "seq 0x%x\n", seqno, mcdi->seqno);
 582	} else {
 583		if (efx->type->mcdi_max_ver >= 2) {
 584			/* MCDI v2 responses don't fit in an event */
 585			efx_mcdi_read_response_header(efx);
 586		} else {
 587			mcdi->resprc = efx_mcdi_errno(mcdi_err);
 588			mcdi->resp_hdr_len = 4;
 589			mcdi->resp_data_len = datalen;
 590		}
 591
 592		wake = true;
 593	}
 594
 595	spin_unlock(&mcdi->iface_lock);
 596
 597	if (wake) {
 598		if (!efx_mcdi_complete_async(mcdi, false))
 599			(void) efx_mcdi_complete_sync(mcdi);
 600
 601		/* If the interface isn't RUNNING_ASYNC or
 602		 * RUNNING_SYNC then we've received a duplicate
 603		 * completion after we've already transitioned back to
 604		 * QUIESCENT. [A subsequent invocation would increment
 605		 * seqno, so would have failed the seqno check].
 606		 */
 607	}
 608}
 609
 610static void efx_mcdi_timeout_async(struct timer_list *t)
 611{
 612	struct efx_mcdi_iface *mcdi = from_timer(mcdi, t, async_timer);
 613
 614	efx_mcdi_complete_async(mcdi, true);
 615}
 616
 617static int
 618efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
 619{
 620	if (efx->type->mcdi_max_ver < 0 ||
 621	     (efx->type->mcdi_max_ver < 2 &&
 622	      cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
 623		return -EINVAL;
 624
 625	if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
 626	    (efx->type->mcdi_max_ver < 2 &&
 627	     inlen > MCDI_CTL_SDU_LEN_MAX_V1))
 628		return -EMSGSIZE;
 629
 630	return 0;
 631}
 632
 633static bool efx_mcdi_get_proxy_handle(struct efx_nic *efx,
 634				      size_t hdr_len, size_t data_len,
 635				      u32 *proxy_handle)
 636{
 637	MCDI_DECLARE_BUF_ERR(testbuf);
 638	const size_t buflen = sizeof(testbuf);
 639
 640	if (!proxy_handle || data_len < buflen)
 641		return false;
 642
 643	efx->type->mcdi_read_response(efx, testbuf, hdr_len, buflen);
 644	if (MCDI_DWORD(testbuf, ERR_CODE) == MC_CMD_ERR_PROXY_PENDING) {
 645		*proxy_handle = MCDI_DWORD(testbuf, ERR_PROXY_PENDING_HANDLE);
 646		return true;
 647	}
 648
 649	return false;
 650}
 651
 652static int _efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned int cmd,
 653				size_t inlen,
 654				efx_dword_t *outbuf, size_t outlen,
 655				size_t *outlen_actual, bool quiet,
 656				u32 *proxy_handle, int *raw_rc)
 657{
 658	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 659	MCDI_DECLARE_BUF_ERR(errbuf);
 660	int rc;
 661
 662	if (mcdi->mode == MCDI_MODE_POLL)
 663		rc = efx_mcdi_poll(efx);
 664	else
 665		rc = efx_mcdi_await_completion(efx);
 666
 667	if (rc != 0) {
 668		netif_err(efx, hw, efx->net_dev,
 669			  "MC command 0x%x inlen %d mode %d timed out\n",
 670			  cmd, (int)inlen, mcdi->mode);
 671
 672		if (mcdi->mode == MCDI_MODE_EVENTS && efx_mcdi_poll_once(efx)) {
 673			netif_err(efx, hw, efx->net_dev,
 674				  "MCDI request was completed without an event\n");
 675			rc = 0;
 676		}
 677
 678		efx_mcdi_abandon(efx);
 679
 680		/* Close the race with efx_mcdi_ev_cpl() executing just too late
 681		 * and completing a request we've just cancelled, by ensuring
 682		 * that the seqno check therein fails.
 683		 */
 684		spin_lock_bh(&mcdi->iface_lock);
 685		++mcdi->seqno;
 686		++mcdi->credits;
 687		spin_unlock_bh(&mcdi->iface_lock);
 688	}
 689
 690	if (proxy_handle)
 691		*proxy_handle = 0;
 692
 693	if (rc != 0) {
 694		if (outlen_actual)
 695			*outlen_actual = 0;
 696	} else {
 697		size_t hdr_len, data_len, err_len;
 698
 699		/* At the very least we need a memory barrier here to ensure
 700		 * we pick up changes from efx_mcdi_ev_cpl(). Protect against
 701		 * a spurious efx_mcdi_ev_cpl() running concurrently by
 702		 * acquiring the iface_lock. */
 703		spin_lock_bh(&mcdi->iface_lock);
 704		rc = mcdi->resprc;
 705		if (raw_rc)
 706			*raw_rc = mcdi->resprc_raw;
 707		hdr_len = mcdi->resp_hdr_len;
 708		data_len = mcdi->resp_data_len;
 709		err_len = min(sizeof(errbuf), data_len);
 710		spin_unlock_bh(&mcdi->iface_lock);
 711
 712		BUG_ON(rc > 0);
 713
 714		efx->type->mcdi_read_response(efx, outbuf, hdr_len,
 715					      min(outlen, data_len));
 716		if (outlen_actual)
 717			*outlen_actual = data_len;
 718
 719		efx->type->mcdi_read_response(efx, errbuf, hdr_len, err_len);
 720
 721		if (cmd == MC_CMD_REBOOT && rc == -EIO) {
 722			/* Don't reset if MC_CMD_REBOOT returns EIO */
 723		} else if (rc == -EIO || rc == -EINTR) {
 724			netif_err(efx, hw, efx->net_dev, "MC reboot detected\n");
 725			netif_dbg(efx, hw, efx->net_dev, "MC rebooted during command %d rc %d\n",
 726				  cmd, -rc);
 727			if (efx->type->mcdi_reboot_detected)
 728				efx->type->mcdi_reboot_detected(efx);
 729			efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
 730		} else if (proxy_handle && (rc == -EPROTO) &&
 731			   efx_mcdi_get_proxy_handle(efx, hdr_len, data_len,
 732						     proxy_handle)) {
 733			mcdi->proxy_rx_status = 0;
 734			mcdi->proxy_rx_handle = 0;
 735			mcdi->state = MCDI_STATE_PROXY_WAIT;
 736		} else if (rc && !quiet) {
 737			efx_mcdi_display_error(efx, cmd, inlen, errbuf, err_len,
 738					       rc);
 739		}
 740
 741		if (rc == -EIO || rc == -EINTR) {
 742			msleep(MCDI_STATUS_SLEEP_MS);
 743			efx_mcdi_poll_reboot(efx);
 744			mcdi->new_epoch = true;
 745		}
 746	}
 747
 748	if (!proxy_handle || !*proxy_handle)
 749		efx_mcdi_release(mcdi);
 750	return rc;
 751}
 752
 753static void efx_mcdi_proxy_abort(struct efx_mcdi_iface *mcdi)
 754{
 755	if (mcdi->state == MCDI_STATE_PROXY_WAIT) {
 756		/* Interrupt the proxy wait. */
 757		mcdi->proxy_rx_status = -EINTR;
 758		wake_up(&mcdi->proxy_rx_wq);
 759	}
 760}
 761
 762static void efx_mcdi_ev_proxy_response(struct efx_nic *efx,
 763				       u32 handle, int status)
 764{
 765	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 766
 767	WARN_ON(mcdi->state != MCDI_STATE_PROXY_WAIT);
 768
 769	mcdi->proxy_rx_status = efx_mcdi_errno(status);
 770	/* Ensure the status is written before we update the handle, since the
 771	 * latter is used to check if we've finished.
 772	 */
 773	wmb();
 774	mcdi->proxy_rx_handle = handle;
 775	wake_up(&mcdi->proxy_rx_wq);
 776}
 777
 778static int efx_mcdi_proxy_wait(struct efx_nic *efx, u32 handle, bool quiet)
 779{
 780	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 781	int rc;
 782
 783	/* Wait for a proxy event, or timeout. */
 784	rc = wait_event_timeout(mcdi->proxy_rx_wq,
 785				mcdi->proxy_rx_handle != 0 ||
 786				mcdi->proxy_rx_status == -EINTR,
 787				MCDI_RPC_TIMEOUT);
 788
 789	if (rc <= 0) {
 790		netif_dbg(efx, hw, efx->net_dev,
 791			  "MCDI proxy timeout %d\n", handle);
 792		return -ETIMEDOUT;
 793	} else if (mcdi->proxy_rx_handle != handle) {
 794		netif_warn(efx, hw, efx->net_dev,
 795			   "MCDI proxy unexpected handle %d (expected %d)\n",
 796			   mcdi->proxy_rx_handle, handle);
 797		return -EINVAL;
 798	}
 799
 800	return mcdi->proxy_rx_status;
 801}
 802
 803static int _efx_mcdi_rpc(struct efx_nic *efx, unsigned int cmd,
 804			 const efx_dword_t *inbuf, size_t inlen,
 805			 efx_dword_t *outbuf, size_t outlen,
 806			 size_t *outlen_actual, bool quiet, int *raw_rc)
 807{
 808	u32 proxy_handle = 0; /* Zero is an invalid proxy handle. */
 809	int rc;
 810
 811	if (inbuf && inlen && (inbuf == outbuf)) {
 812		/* The input buffer can't be aliased with the output. */
 813		WARN_ON(1);
 814		return -EINVAL;
 815	}
 816
 817	rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen);
 818	if (rc)
 819		return rc;
 820
 821	rc = _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
 822				  outlen_actual, quiet, &proxy_handle, raw_rc);
 823
 824	if (proxy_handle) {
 825		/* Handle proxy authorisation. This allows approval of MCDI
 826		 * operations to be delegated to the admin function, allowing
 827		 * fine control over (eg) multicast subscriptions.
 828		 */
 829		struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 830
 831		netif_dbg(efx, hw, efx->net_dev,
 832			  "MCDI waiting for proxy auth %d\n",
 833			  proxy_handle);
 834		rc = efx_mcdi_proxy_wait(efx, proxy_handle, quiet);
 835
 836		if (rc == 0) {
 837			netif_dbg(efx, hw, efx->net_dev,
 838				  "MCDI proxy retry %d\n", proxy_handle);
 839
 840			/* We now retry the original request. */
 841			mcdi->state = MCDI_STATE_RUNNING_SYNC;
 842			efx_mcdi_send_request(efx, cmd, inbuf, inlen);
 843
 844			rc = _efx_mcdi_rpc_finish(efx, cmd, inlen,
 845						  outbuf, outlen, outlen_actual,
 846						  quiet, NULL, raw_rc);
 847		} else {
 848			netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
 849				       "MC command 0x%x failed after proxy auth rc=%d\n",
 850				       cmd, rc);
 851
 852			if (rc == -EINTR || rc == -EIO)
 853				efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
 854			efx_mcdi_release(mcdi);
 855		}
 856	}
 857
 858	return rc;
 859}
 860
 861static int _efx_mcdi_rpc_evb_retry(struct efx_nic *efx, unsigned cmd,
 862				   const efx_dword_t *inbuf, size_t inlen,
 863				   efx_dword_t *outbuf, size_t outlen,
 864				   size_t *outlen_actual, bool quiet)
 865{
 866	int raw_rc = 0;
 867	int rc;
 868
 869	rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
 870			   outbuf, outlen, outlen_actual, true, &raw_rc);
 871
 872	if ((rc == -EPROTO) && (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
 873	    efx->type->is_vf) {
 874		/* If the EVB port isn't available within a VF this may
 875		 * mean the PF is still bringing the switch up. We should
 876		 * retry our request shortly.
 877		 */
 878		unsigned long abort_time = jiffies + MCDI_RPC_TIMEOUT;
 879		unsigned int delay_us = 10000;
 880
 881		netif_dbg(efx, hw, efx->net_dev,
 882			  "%s: NO_EVB_PORT; will retry request\n",
 883			  __func__);
 884
 885		do {
 886			usleep_range(delay_us, delay_us + 10000);
 887			rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
 888					   outbuf, outlen, outlen_actual,
 889					   true, &raw_rc);
 890			if (delay_us < 100000)
 891				delay_us <<= 1;
 892		} while ((rc == -EPROTO) &&
 893			 (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
 894			 time_before(jiffies, abort_time));
 895	}
 896
 897	if (rc && !quiet && !(cmd == MC_CMD_REBOOT && rc == -EIO))
 898		efx_mcdi_display_error(efx, cmd, inlen,
 899				       outbuf, outlen, rc);
 900
 901	return rc;
 902}
 903
 904/**
 905 * efx_mcdi_rpc - Issue an MCDI command and wait for completion
 906 * @efx: NIC through which to issue the command
 907 * @cmd: Command type number
 908 * @inbuf: Command parameters
 909 * @inlen: Length of command parameters, in bytes.  Must be a multiple
 910 *	of 4 and no greater than %MCDI_CTL_SDU_LEN_MAX_V1.
 911 * @outbuf: Response buffer.  May be %NULL if @outlen is 0.
 912 * @outlen: Length of response buffer, in bytes.  If the actual
 913 *	response is longer than @outlen & ~3, it will be truncated
 914 *	to that length.
 915 * @outlen_actual: Pointer through which to return the actual response
 916 *	length.  May be %NULL if this is not needed.
 917 *
 918 * This function may sleep and therefore must be called in an appropriate
 919 * context.
 920 *
 921 * Return: A negative error code, or zero if successful.  The error
 922 *	code may come from the MCDI response or may indicate a failure
 923 *	to communicate with the MC.  In the former case, the response
 924 *	will still be copied to @outbuf and *@outlen_actual will be
 925 *	set accordingly.  In the latter case, *@outlen_actual will be
 926 *	set to zero.
 927 */
 928int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
 929		 const efx_dword_t *inbuf, size_t inlen,
 930		 efx_dword_t *outbuf, size_t outlen,
 931		 size_t *outlen_actual)
 932{
 933	return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
 934				       outlen_actual, false);
 935}
 936
 937/* Normally, on receiving an error code in the MCDI response,
 938 * efx_mcdi_rpc will log an error message containing (among other
 939 * things) the raw error code, by means of efx_mcdi_display_error.
 940 * This _quiet version suppresses that; if the caller wishes to log
 941 * the error conditionally on the return code, it should call this
 942 * function and is then responsible for calling efx_mcdi_display_error
 943 * as needed.
 944 */
 945int efx_mcdi_rpc_quiet(struct efx_nic *efx, unsigned cmd,
 946		       const efx_dword_t *inbuf, size_t inlen,
 947		       efx_dword_t *outbuf, size_t outlen,
 948		       size_t *outlen_actual)
 949{
 950	return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
 951				       outlen_actual, true);
 952}
 953
 954int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
 955		       const efx_dword_t *inbuf, size_t inlen)
 956{
 957	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 958	int rc;
 959
 960	rc = efx_mcdi_check_supported(efx, cmd, inlen);
 961	if (rc)
 962		return rc;
 963
 964	if (efx->mc_bist_for_other_fn)
 965		return -ENETDOWN;
 966
 967	if (mcdi->mode == MCDI_MODE_FAIL)
 968		return -ENETDOWN;
 969
 970	efx_mcdi_acquire_sync(mcdi);
 971	efx_mcdi_send_request(efx, cmd, inbuf, inlen);
 972	return 0;
 973}
 974
 975static int _efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
 976			       const efx_dword_t *inbuf, size_t inlen,
 977			       size_t outlen,
 978			       efx_mcdi_async_completer *complete,
 979			       unsigned long cookie, bool quiet)
 980{
 981	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 982	struct efx_mcdi_async_param *async;
 983	int rc;
 984
 985	rc = efx_mcdi_check_supported(efx, cmd, inlen);
 986	if (rc)
 987		return rc;
 988
 989	if (efx->mc_bist_for_other_fn)
 990		return -ENETDOWN;
 991
 992	async = kmalloc(sizeof(*async) + ALIGN(max(inlen, outlen), 4),
 993			GFP_ATOMIC);
 994	if (!async)
 995		return -ENOMEM;
 996
 997	async->cmd = cmd;
 998	async->inlen = inlen;
 999	async->outlen = outlen;
1000	async->quiet = quiet;
1001	async->complete = complete;
1002	async->cookie = cookie;
1003	memcpy(async + 1, inbuf, inlen);
1004
1005	spin_lock_bh(&mcdi->async_lock);
1006
1007	if (mcdi->mode == MCDI_MODE_EVENTS) {
1008		list_add_tail(&async->list, &mcdi->async_list);
1009
1010		/* If this is at the front of the queue, try to start it
1011		 * immediately
1012		 */
1013		if (mcdi->async_list.next == &async->list &&
1014		    efx_mcdi_acquire_async(mcdi)) {
1015			efx_mcdi_send_request(efx, cmd, inbuf, inlen);
1016			mod_timer(&mcdi->async_timer,
1017				  jiffies + MCDI_RPC_TIMEOUT);
1018		}
1019	} else {
1020		kfree(async);
1021		rc = -ENETDOWN;
1022	}
1023
1024	spin_unlock_bh(&mcdi->async_lock);
1025
1026	return rc;
1027}
1028
1029/**
1030 * efx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously
1031 * @efx: NIC through which to issue the command
1032 * @cmd: Command type number
1033 * @inbuf: Command parameters
1034 * @inlen: Length of command parameters, in bytes
1035 * @outlen: Length to allocate for response buffer, in bytes
1036 * @complete: Function to be called on completion or cancellation.
1037 * @cookie: Arbitrary value to be passed to @complete.
1038 *
1039 * This function does not sleep and therefore may be called in atomic
1040 * context.  It will fail if event queues are disabled or if MCDI
1041 * event completions have been disabled due to an error.
1042 *
1043 * If it succeeds, the @complete function will be called exactly once
1044 * in atomic context, when one of the following occurs:
1045 * (a) the completion event is received (in NAPI context)
1046 * (b) event queues are disabled (in the process that disables them)
1047 * (c) the request times-out (in timer context)
1048 */
1049int
1050efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
1051		   const efx_dword_t *inbuf, size_t inlen, size_t outlen,
1052		   efx_mcdi_async_completer *complete, unsigned long cookie)
1053{
1054	return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1055				   cookie, false);
1056}
1057
1058int efx_mcdi_rpc_async_quiet(struct efx_nic *efx, unsigned int cmd,
1059			     const efx_dword_t *inbuf, size_t inlen,
1060			     size_t outlen, efx_mcdi_async_completer *complete,
1061			     unsigned long cookie)
1062{
1063	return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1064				   cookie, true);
1065}
1066
1067int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen,
1068			efx_dword_t *outbuf, size_t outlen,
1069			size_t *outlen_actual)
1070{
1071	return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1072				    outlen_actual, false, NULL, NULL);
1073}
1074
1075int efx_mcdi_rpc_finish_quiet(struct efx_nic *efx, unsigned cmd, size_t inlen,
1076			      efx_dword_t *outbuf, size_t outlen,
1077			      size_t *outlen_actual)
1078{
1079	return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1080				    outlen_actual, true, NULL, NULL);
1081}
1082
1083void efx_mcdi_display_error(struct efx_nic *efx, unsigned cmd,
1084			    size_t inlen, efx_dword_t *outbuf,
1085			    size_t outlen, int rc)
1086{
1087	int code = 0, err_arg = 0;
1088
1089	if (outlen >= MC_CMD_ERR_CODE_OFST + 4)
1090		code = MCDI_DWORD(outbuf, ERR_CODE);
1091	if (outlen >= MC_CMD_ERR_ARG_OFST + 4)
1092		err_arg = MCDI_DWORD(outbuf, ERR_ARG);
1093	netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
1094		       "MC command 0x%x inlen %zu failed rc=%d (raw=%d) arg=%d\n",
1095		       cmd, inlen, rc, code, err_arg);
1096}
1097
1098/* Switch to polled MCDI completions.  This can be called in various
1099 * error conditions with various locks held, so it must be lockless.
1100 * Caller is responsible for flushing asynchronous requests later.
1101 */
1102void efx_mcdi_mode_poll(struct efx_nic *efx)
1103{
1104	struct efx_mcdi_iface *mcdi;
1105
1106	if (!efx->mcdi)
1107		return;
1108
1109	mcdi = efx_mcdi(efx);
1110	/* If already in polling mode, nothing to do.
1111	 * If in fail-fast state, don't switch to polled completion.
1112	 * FLR recovery will do that later.
1113	 */
1114	if (mcdi->mode == MCDI_MODE_POLL || mcdi->mode == MCDI_MODE_FAIL)
1115		return;
1116
1117	/* We can switch from event completion to polled completion, because
1118	 * mcdi requests are always completed in shared memory. We do this by
1119	 * switching the mode to POLL'd then completing the request.
1120	 * efx_mcdi_await_completion() will then call efx_mcdi_poll().
1121	 *
1122	 * We need an smp_wmb() to synchronise with efx_mcdi_await_completion(),
1123	 * which efx_mcdi_complete_sync() provides for us.
1124	 */
1125	mcdi->mode = MCDI_MODE_POLL;
1126
1127	efx_mcdi_complete_sync(mcdi);
1128}
1129
1130/* Flush any running or queued asynchronous requests, after event processing
1131 * is stopped
1132 */
1133void efx_mcdi_flush_async(struct efx_nic *efx)
1134{
1135	struct efx_mcdi_async_param *async, *next;
1136	struct efx_mcdi_iface *mcdi;
1137
1138	if (!efx->mcdi)
1139		return;
1140
1141	mcdi = efx_mcdi(efx);
1142
1143	/* We must be in poll or fail mode so no more requests can be queued */
1144	BUG_ON(mcdi->mode == MCDI_MODE_EVENTS);
1145
1146	del_timer_sync(&mcdi->async_timer);
1147
1148	/* If a request is still running, make sure we give the MC
1149	 * time to complete it so that the response won't overwrite our
1150	 * next request.
1151	 */
1152	if (mcdi->state == MCDI_STATE_RUNNING_ASYNC) {
1153		efx_mcdi_poll(efx);
1154		mcdi->state = MCDI_STATE_QUIESCENT;
1155	}
1156
1157	/* Nothing else will access the async list now, so it is safe
1158	 * to walk it without holding async_lock.  If we hold it while
1159	 * calling a completer then lockdep may warn that we have
1160	 * acquired locks in the wrong order.
1161	 */
1162	list_for_each_entry_safe(async, next, &mcdi->async_list, list) {
1163		if (async->complete)
1164			async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
1165		list_del(&async->list);
1166		kfree(async);
1167	}
1168}
1169
1170void efx_mcdi_mode_event(struct efx_nic *efx)
1171{
1172	struct efx_mcdi_iface *mcdi;
1173
1174	if (!efx->mcdi)
1175		return;
1176
1177	mcdi = efx_mcdi(efx);
1178	/* If already in event completion mode, nothing to do.
1179	 * If in fail-fast state, don't switch to event completion.  FLR
1180	 * recovery will do that later.
1181	 */
1182	if (mcdi->mode == MCDI_MODE_EVENTS || mcdi->mode == MCDI_MODE_FAIL)
1183		return;
1184
1185	/* We can't switch from polled to event completion in the middle of a
1186	 * request, because the completion method is specified in the request.
1187	 * So acquire the interface to serialise the requestors. We don't need
1188	 * to acquire the iface_lock to change the mode here, but we do need a
1189	 * write memory barrier ensure that efx_mcdi_rpc() sees it, which
1190	 * efx_mcdi_acquire() provides.
1191	 */
1192	efx_mcdi_acquire_sync(mcdi);
1193	mcdi->mode = MCDI_MODE_EVENTS;
1194	efx_mcdi_release(mcdi);
1195}
1196
1197static void efx_mcdi_ev_death(struct efx_nic *efx, int rc)
1198{
1199	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1200
1201	/* If there is an outstanding MCDI request, it has been terminated
1202	 * either by a BADASSERT or REBOOT event. If the mcdi interface is
1203	 * in polled mode, then do nothing because the MC reboot handler will
1204	 * set the header correctly. However, if the mcdi interface is waiting
1205	 * for a CMDDONE event it won't receive it [and since all MCDI events
1206	 * are sent to the same queue, we can't be racing with
1207	 * efx_mcdi_ev_cpl()]
1208	 *
1209	 * If there is an outstanding asynchronous request, we can't
1210	 * complete it now (efx_mcdi_complete() would deadlock).  The
1211	 * reset process will take care of this.
1212	 *
1213	 * There's a race here with efx_mcdi_send_request(), because
1214	 * we might receive a REBOOT event *before* the request has
1215	 * been copied out. In polled mode (during startup) this is
1216	 * irrelevant, because efx_mcdi_complete_sync() is ignored. In
1217	 * event mode, this condition is just an edge-case of
1218	 * receiving a REBOOT event after posting the MCDI
1219	 * request. Did the mc reboot before or after the copyout? The
1220	 * best we can do always is just return failure.
1221	 *
1222	 * If there is an outstanding proxy response expected it is not going
1223	 * to arrive. We should thus abort it.
1224	 */
1225	spin_lock(&mcdi->iface_lock);
1226	efx_mcdi_proxy_abort(mcdi);
1227
1228	if (efx_mcdi_complete_sync(mcdi)) {
1229		if (mcdi->mode == MCDI_MODE_EVENTS) {
1230			mcdi->resprc = rc;
1231			mcdi->resp_hdr_len = 0;
1232			mcdi->resp_data_len = 0;
1233			++mcdi->credits;
1234		}
1235	} else {
1236		int count;
1237
1238		/* Consume the status word since efx_mcdi_rpc_finish() won't */
1239		for (count = 0; count < MCDI_STATUS_DELAY_COUNT; ++count) {
1240			rc = efx_mcdi_poll_reboot(efx);
1241			if (rc)
1242				break;
1243			udelay(MCDI_STATUS_DELAY_US);
1244		}
1245
1246		/* On EF10, a CODE_MC_REBOOT event can be received without the
1247		 * reboot detection in efx_mcdi_poll_reboot() being triggered.
1248		 * If zero was returned from the final call to
1249		 * efx_mcdi_poll_reboot(), the MC reboot wasn't noticed but the
1250		 * MC has definitely rebooted so prepare for the reset.
1251		 */
1252		if (!rc && efx->type->mcdi_reboot_detected)
1253			efx->type->mcdi_reboot_detected(efx);
1254
1255		mcdi->new_epoch = true;
1256
1257		/* Nobody was waiting for an MCDI request, so trigger a reset */
1258		efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
1259	}
1260
1261	spin_unlock(&mcdi->iface_lock);
1262}
1263
1264/* The MC is going down in to BIST mode. set the BIST flag to block
1265 * new MCDI, cancel any outstanding MCDI and and schedule a BIST-type reset
1266 * (which doesn't actually execute a reset, it waits for the controlling
1267 * function to reset it).
1268 */
1269static void efx_mcdi_ev_bist(struct efx_nic *efx)
1270{
1271	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1272
1273	spin_lock(&mcdi->iface_lock);
1274	efx->mc_bist_for_other_fn = true;
1275	efx_mcdi_proxy_abort(mcdi);
1276
1277	if (efx_mcdi_complete_sync(mcdi)) {
1278		if (mcdi->mode == MCDI_MODE_EVENTS) {
1279			mcdi->resprc = -EIO;
1280			mcdi->resp_hdr_len = 0;
1281			mcdi->resp_data_len = 0;
1282			++mcdi->credits;
1283		}
1284	}
1285	mcdi->new_epoch = true;
1286	efx_schedule_reset(efx, RESET_TYPE_MC_BIST);
1287	spin_unlock(&mcdi->iface_lock);
1288}
1289
1290/* MCDI timeouts seen, so make all MCDI calls fail-fast and issue an FLR to try
1291 * to recover.
1292 */
1293static void efx_mcdi_abandon(struct efx_nic *efx)
1294{
1295	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1296
1297	if (xchg(&mcdi->mode, MCDI_MODE_FAIL) == MCDI_MODE_FAIL)
1298		return; /* it had already been done */
1299	netif_dbg(efx, hw, efx->net_dev, "MCDI is timing out; trying to recover\n");
1300	efx_schedule_reset(efx, RESET_TYPE_MCDI_TIMEOUT);
1301}
1302
 
 
 
 
 
 
 
 
1303/* Called from efx_farch_ev_process and efx_ef10_ev_process for MCDI events */
1304void efx_mcdi_process_event(struct efx_channel *channel,
1305			    efx_qword_t *event)
1306{
1307	struct efx_nic *efx = channel->efx;
1308	int code = EFX_QWORD_FIELD(*event, MCDI_EVENT_CODE);
1309	u32 data = EFX_QWORD_FIELD(*event, MCDI_EVENT_DATA);
1310
1311	switch (code) {
1312	case MCDI_EVENT_CODE_BADSSERT:
1313		netif_err(efx, hw, efx->net_dev,
1314			  "MC watchdog or assertion failure at 0x%x\n", data);
1315		efx_mcdi_ev_death(efx, -EINTR);
1316		break;
1317
1318	case MCDI_EVENT_CODE_PMNOTICE:
1319		netif_info(efx, wol, efx->net_dev, "MCDI PM event.\n");
1320		break;
1321
1322	case MCDI_EVENT_CODE_CMDDONE:
1323		efx_mcdi_ev_cpl(efx,
1324				MCDI_EVENT_FIELD(*event, CMDDONE_SEQ),
1325				MCDI_EVENT_FIELD(*event, CMDDONE_DATALEN),
1326				MCDI_EVENT_FIELD(*event, CMDDONE_ERRNO));
1327		break;
1328
1329	case MCDI_EVENT_CODE_LINKCHANGE:
1330		efx_mcdi_process_link_change(efx, event);
1331		break;
1332	case MCDI_EVENT_CODE_SENSOREVT:
1333		efx_mcdi_sensor_event(efx, event);
1334		break;
1335	case MCDI_EVENT_CODE_SCHEDERR:
1336		netif_dbg(efx, hw, efx->net_dev,
1337			  "MC Scheduler alert (0x%x)\n", data);
1338		break;
1339	case MCDI_EVENT_CODE_REBOOT:
1340	case MCDI_EVENT_CODE_MC_REBOOT:
1341		netif_info(efx, hw, efx->net_dev, "MC Reboot\n");
1342		efx_mcdi_ev_death(efx, -EIO);
1343		break;
1344	case MCDI_EVENT_CODE_MC_BIST:
1345		netif_info(efx, hw, efx->net_dev, "MC entered BIST mode\n");
1346		efx_mcdi_ev_bist(efx);
1347		break;
1348	case MCDI_EVENT_CODE_MAC_STATS_DMA:
1349		/* MAC stats are gather lazily.  We can ignore this. */
1350		break;
1351	case MCDI_EVENT_CODE_FLR:
1352		if (efx->type->sriov_flr)
1353			efx->type->sriov_flr(efx,
1354					     MCDI_EVENT_FIELD(*event, FLR_VF));
1355		break;
1356	case MCDI_EVENT_CODE_PTP_RX:
1357	case MCDI_EVENT_CODE_PTP_FAULT:
1358	case MCDI_EVENT_CODE_PTP_PPS:
1359		efx_ptp_event(efx, event);
1360		break;
1361	case MCDI_EVENT_CODE_PTP_TIME:
1362		efx_time_sync_event(channel, event);
1363		break;
1364	case MCDI_EVENT_CODE_TX_FLUSH:
1365	case MCDI_EVENT_CODE_RX_FLUSH:
1366		/* Two flush events will be sent: one to the same event
1367		 * queue as completions, and one to event queue 0.
1368		 * In the latter case the {RX,TX}_FLUSH_TO_DRIVER
1369		 * flag will be set, and we should ignore the event
1370		 * because we want to wait for all completions.
1371		 */
1372		BUILD_BUG_ON(MCDI_EVENT_TX_FLUSH_TO_DRIVER_LBN !=
1373			     MCDI_EVENT_RX_FLUSH_TO_DRIVER_LBN);
1374		if (!MCDI_EVENT_FIELD(*event, TX_FLUSH_TO_DRIVER))
1375			efx_ef10_handle_drain_event(efx);
1376		break;
1377	case MCDI_EVENT_CODE_TX_ERR:
1378	case MCDI_EVENT_CODE_RX_ERR:
1379		netif_err(efx, hw, efx->net_dev,
1380			  "%s DMA error (event: "EFX_QWORD_FMT")\n",
1381			  code == MCDI_EVENT_CODE_TX_ERR ? "TX" : "RX",
1382			  EFX_QWORD_VAL(*event));
1383		efx_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
1384		break;
1385	case MCDI_EVENT_CODE_PROXY_RESPONSE:
1386		efx_mcdi_ev_proxy_response(efx,
1387				MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_HANDLE),
1388				MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_RC));
1389		break;
1390	default:
1391		netif_err(efx, hw, efx->net_dev,
1392			  "Unknown MCDI event " EFX_QWORD_FMT "\n",
1393			  EFX_QWORD_VAL(*event));
1394	}
1395}
1396
1397/**************************************************************************
1398 *
1399 * Specific request functions
1400 *
1401 **************************************************************************
1402 */
1403
1404void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
1405{
1406	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_VERSION_OUT_LEN);
1407	size_t outlength;
1408	const __le16 *ver_words;
1409	size_t offset;
1410	int rc;
1411
1412	BUILD_BUG_ON(MC_CMD_GET_VERSION_IN_LEN != 0);
1413	rc = efx_mcdi_rpc(efx, MC_CMD_GET_VERSION, NULL, 0,
1414			  outbuf, sizeof(outbuf), &outlength);
1415	if (rc)
1416		goto fail;
1417	if (outlength < MC_CMD_GET_VERSION_OUT_LEN) {
1418		rc = -EIO;
1419		goto fail;
1420	}
1421
1422	ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION);
1423	offset = snprintf(buf, len, "%u.%u.%u.%u",
1424			  le16_to_cpu(ver_words[0]), le16_to_cpu(ver_words[1]),
1425			  le16_to_cpu(ver_words[2]), le16_to_cpu(ver_words[3]));
1426
1427	/* EF10 may have multiple datapath firmware variants within a
1428	 * single version.  Report which variants are running.
 
 
 
 
 
 
 
1429	 */
1430	if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) {
1431		struct efx_ef10_nic_data *nic_data = efx->nic_data;
1432
1433		offset += snprintf(buf + offset, len - offset, " rx%x tx%x",
1434				   nic_data->rx_dpcpu_fw_id,
1435				   nic_data->tx_dpcpu_fw_id);
1436
1437		/* It's theoretically possible for the string to exceed 31
1438		 * characters, though in practice the first three version
1439		 * components are short enough that this doesn't happen.
1440		 */
1441		if (WARN_ON(offset >= len))
1442			buf[0] = 0;
1443	}
1444
1445	return;
1446
1447fail:
1448	netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1449	buf[0] = 0;
1450}
1451
1452static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
1453			       bool *was_attached)
1454{
1455	MCDI_DECLARE_BUF(inbuf, MC_CMD_DRV_ATTACH_IN_LEN);
1456	MCDI_DECLARE_BUF(outbuf, MC_CMD_DRV_ATTACH_EXT_OUT_LEN);
1457	size_t outlen;
1458	int rc;
1459
1460	MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_NEW_STATE,
1461		       driver_operating ? 1 : 0);
1462	MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_UPDATE, 1);
1463	MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID, MC_CMD_FW_LOW_LATENCY);
1464
1465	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf, sizeof(inbuf),
1466				outbuf, sizeof(outbuf), &outlen);
1467	/* If we're not the primary PF, trying to ATTACH with a FIRMWARE_ID
1468	 * specified will fail with EPERM, and we have to tell the MC we don't
1469	 * care what firmware we get.
1470	 */
1471	if (rc == -EPERM) {
1472		netif_dbg(efx, probe, efx->net_dev,
1473			  "efx_mcdi_drv_attach with fw-variant setting failed EPERM, trying without it\n");
 
1474		MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID,
1475			       MC_CMD_FW_DONT_CARE);
1476		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf,
1477					sizeof(inbuf), outbuf, sizeof(outbuf),
1478					&outlen);
1479	}
1480	if (rc) {
1481		efx_mcdi_display_error(efx, MC_CMD_DRV_ATTACH, sizeof(inbuf),
1482				       outbuf, outlen, rc);
1483		goto fail;
1484	}
1485	if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN) {
1486		rc = -EIO;
1487		goto fail;
1488	}
1489
1490	if (driver_operating) {
1491		if (outlen >= MC_CMD_DRV_ATTACH_EXT_OUT_LEN) {
1492			efx->mcdi->fn_flags =
1493				MCDI_DWORD(outbuf,
1494					   DRV_ATTACH_EXT_OUT_FUNC_FLAGS);
1495		} else {
1496			/* Synthesise flags for Siena */
1497			efx->mcdi->fn_flags =
1498				1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL |
1499				1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED |
1500				(efx_port_num(efx) == 0) <<
1501				MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY;
1502		}
1503	}
1504
1505	/* We currently assume we have control of the external link
1506	 * and are completely trusted by firmware.  Abort probing
1507	 * if that's not true for this function.
1508	 */
1509
1510	if (was_attached != NULL)
1511		*was_attached = MCDI_DWORD(outbuf, DRV_ATTACH_OUT_OLD_STATE);
1512	return 0;
1513
1514fail:
1515	netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1516	return rc;
1517}
1518
1519int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
1520			   u16 *fw_subtype_list, u32 *capabilities)
1521{
1522	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_BOARD_CFG_OUT_LENMAX);
1523	size_t outlen, i;
1524	int port_num = efx_port_num(efx);
1525	int rc;
1526
1527	BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_IN_LEN != 0);
1528	/* we need __aligned(2) for ether_addr_copy */
1529	BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0_OFST & 1);
1530	BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1_OFST & 1);
1531
1532	rc = efx_mcdi_rpc(efx, MC_CMD_GET_BOARD_CFG, NULL, 0,
1533			  outbuf, sizeof(outbuf), &outlen);
1534	if (rc)
1535		goto fail;
1536
1537	if (outlen < MC_CMD_GET_BOARD_CFG_OUT_LENMIN) {
1538		rc = -EIO;
1539		goto fail;
1540	}
1541
1542	if (mac_address)
1543		ether_addr_copy(mac_address,
1544				port_num ?
1545				MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1) :
1546				MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0));
1547	if (fw_subtype_list) {
1548		for (i = 0;
1549		     i < MCDI_VAR_ARRAY_LEN(outlen,
1550					    GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST);
1551		     i++)
1552			fw_subtype_list[i] = MCDI_ARRAY_WORD(
1553				outbuf, GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST, i);
1554		for (; i < MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM; i++)
1555			fw_subtype_list[i] = 0;
1556	}
1557	if (capabilities) {
1558		if (port_num)
1559			*capabilities = MCDI_DWORD(outbuf,
1560					GET_BOARD_CFG_OUT_CAPABILITIES_PORT1);
1561		else
1562			*capabilities = MCDI_DWORD(outbuf,
1563					GET_BOARD_CFG_OUT_CAPABILITIES_PORT0);
1564	}
1565
1566	return 0;
1567
1568fail:
1569	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d len=%d\n",
1570		  __func__, rc, (int)outlen);
1571
1572	return rc;
1573}
1574
1575int efx_mcdi_log_ctrl(struct efx_nic *efx, bool evq, bool uart, u32 dest_evq)
1576{
1577	MCDI_DECLARE_BUF(inbuf, MC_CMD_LOG_CTRL_IN_LEN);
1578	u32 dest = 0;
1579	int rc;
1580
1581	if (uart)
1582		dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_UART;
1583	if (evq)
1584		dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_EVQ;
1585
1586	MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST, dest);
1587	MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST_EVQ, dest_evq);
1588
1589	BUILD_BUG_ON(MC_CMD_LOG_CTRL_OUT_LEN != 0);
1590
1591	rc = efx_mcdi_rpc(efx, MC_CMD_LOG_CTRL, inbuf, sizeof(inbuf),
1592			  NULL, 0, NULL);
1593	return rc;
1594}
1595
1596int efx_mcdi_nvram_types(struct efx_nic *efx, u32 *nvram_types_out)
1597{
1598	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TYPES_OUT_LEN);
1599	size_t outlen;
1600	int rc;
1601
1602	BUILD_BUG_ON(MC_CMD_NVRAM_TYPES_IN_LEN != 0);
1603
1604	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TYPES, NULL, 0,
1605			  outbuf, sizeof(outbuf), &outlen);
1606	if (rc)
1607		goto fail;
1608	if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN) {
1609		rc = -EIO;
1610		goto fail;
1611	}
1612
1613	*nvram_types_out = MCDI_DWORD(outbuf, NVRAM_TYPES_OUT_TYPES);
1614	return 0;
1615
1616fail:
1617	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
1618		  __func__, rc);
1619	return rc;
1620}
1621
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1622int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
1623			size_t *size_out, size_t *erase_size_out,
1624			bool *protected_out)
1625{
1626	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_INFO_IN_LEN);
1627	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_INFO_OUT_LEN);
1628	size_t outlen;
1629	int rc;
1630
1631	MCDI_SET_DWORD(inbuf, NVRAM_INFO_IN_TYPE, type);
1632
1633	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_INFO, inbuf, sizeof(inbuf),
1634			  outbuf, sizeof(outbuf), &outlen);
1635	if (rc)
1636		goto fail;
1637	if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN) {
1638		rc = -EIO;
1639		goto fail;
1640	}
1641
1642	*size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_SIZE);
1643	*erase_size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_ERASESIZE);
1644	*protected_out = !!(MCDI_DWORD(outbuf, NVRAM_INFO_OUT_FLAGS) &
1645				(1 << MC_CMD_NVRAM_INFO_OUT_PROTECTED_LBN));
1646	return 0;
1647
1648fail:
1649	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1650	return rc;
1651}
1652
1653static int efx_mcdi_nvram_test(struct efx_nic *efx, unsigned int type)
1654{
1655	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_TEST_IN_LEN);
1656	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TEST_OUT_LEN);
1657	int rc;
1658
1659	MCDI_SET_DWORD(inbuf, NVRAM_TEST_IN_TYPE, type);
1660
1661	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TEST, inbuf, sizeof(inbuf),
1662			  outbuf, sizeof(outbuf), NULL);
1663	if (rc)
1664		return rc;
1665
1666	switch (MCDI_DWORD(outbuf, NVRAM_TEST_OUT_RESULT)) {
1667	case MC_CMD_NVRAM_TEST_PASS:
1668	case MC_CMD_NVRAM_TEST_NOTSUPP:
1669		return 0;
1670	default:
1671		return -EIO;
1672	}
1673}
1674
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1675int efx_mcdi_nvram_test_all(struct efx_nic *efx)
1676{
1677	u32 nvram_types;
1678	unsigned int type;
1679	int rc;
1680
1681	rc = efx_mcdi_nvram_types(efx, &nvram_types);
1682	if (rc)
1683		goto fail1;
1684
1685	type = 0;
1686	while (nvram_types != 0) {
1687		if (nvram_types & 1) {
1688			rc = efx_mcdi_nvram_test(efx, type);
1689			if (rc)
1690				goto fail2;
1691		}
1692		type++;
1693		nvram_types >>= 1;
1694	}
1695
1696	return 0;
1697
1698fail2:
1699	netif_err(efx, hw, efx->net_dev, "%s: failed type=%u\n",
1700		  __func__, type);
1701fail1:
1702	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1703	return rc;
1704}
1705
1706/* Returns 1 if an assertion was read, 0 if no assertion had fired,
1707 * negative on error.
1708 */
1709static int efx_mcdi_read_assertion(struct efx_nic *efx)
1710{
1711	MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_ASSERTS_IN_LEN);
1712	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_ASSERTS_OUT_LEN);
1713	unsigned int flags, index;
1714	const char *reason;
1715	size_t outlen;
1716	int retry;
1717	int rc;
1718
1719	/* Attempt to read any stored assertion state before we reboot
1720	 * the mcfw out of the assertion handler. Retry twice, once
1721	 * because a boot-time assertion might cause this command to fail
1722	 * with EINTR. And once again because GET_ASSERTS can race with
1723	 * MC_CMD_REBOOT running on the other port. */
1724	retry = 2;
1725	do {
1726		MCDI_SET_DWORD(inbuf, GET_ASSERTS_IN_CLEAR, 1);
1727		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_GET_ASSERTS,
1728					inbuf, MC_CMD_GET_ASSERTS_IN_LEN,
1729					outbuf, sizeof(outbuf), &outlen);
1730		if (rc == -EPERM)
1731			return 0;
1732	} while ((rc == -EINTR || rc == -EIO) && retry-- > 0);
1733
1734	if (rc) {
1735		efx_mcdi_display_error(efx, MC_CMD_GET_ASSERTS,
1736				       MC_CMD_GET_ASSERTS_IN_LEN, outbuf,
1737				       outlen, rc);
1738		return rc;
1739	}
1740	if (outlen < MC_CMD_GET_ASSERTS_OUT_LEN)
1741		return -EIO;
1742
1743	/* Print out any recorded assertion state */
1744	flags = MCDI_DWORD(outbuf, GET_ASSERTS_OUT_GLOBAL_FLAGS);
1745	if (flags == MC_CMD_GET_ASSERTS_FLAGS_NO_FAILS)
1746		return 0;
1747
1748	reason = (flags == MC_CMD_GET_ASSERTS_FLAGS_SYS_FAIL)
1749		? "system-level assertion"
1750		: (flags == MC_CMD_GET_ASSERTS_FLAGS_THR_FAIL)
1751		? "thread-level assertion"
1752		: (flags == MC_CMD_GET_ASSERTS_FLAGS_WDOG_FIRED)
1753		? "watchdog reset"
1754		: "unknown assertion";
1755	netif_err(efx, hw, efx->net_dev,
1756		  "MCPU %s at PC = 0x%.8x in thread 0x%.8x\n", reason,
1757		  MCDI_DWORD(outbuf, GET_ASSERTS_OUT_SAVED_PC_OFFS),
1758		  MCDI_DWORD(outbuf, GET_ASSERTS_OUT_THREAD_OFFS));
1759
1760	/* Print out the registers */
1761	for (index = 0;
1762	     index < MC_CMD_GET_ASSERTS_OUT_GP_REGS_OFFS_NUM;
1763	     index++)
1764		netif_err(efx, hw, efx->net_dev, "R%.2d (?): 0x%.8x\n",
1765			  1 + index,
1766			  MCDI_ARRAY_DWORD(outbuf, GET_ASSERTS_OUT_GP_REGS_OFFS,
1767					   index));
1768
1769	return 1;
1770}
1771
1772static int efx_mcdi_exit_assertion(struct efx_nic *efx)
1773{
1774	MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1775	int rc;
1776
1777	/* If the MC is running debug firmware, it might now be
1778	 * waiting for a debugger to attach, but we just want it to
1779	 * reboot.  We set a flag that makes the command a no-op if it
1780	 * has already done so.
1781	 * The MCDI will thus return either 0 or -EIO.
1782	 */
1783	BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1784	MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS,
1785		       MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION);
1786	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN,
1787				NULL, 0, NULL);
1788	if (rc == -EIO)
1789		rc = 0;
1790	if (rc)
1791		efx_mcdi_display_error(efx, MC_CMD_REBOOT, MC_CMD_REBOOT_IN_LEN,
1792				       NULL, 0, rc);
1793	return rc;
1794}
1795
1796int efx_mcdi_handle_assertion(struct efx_nic *efx)
1797{
1798	int rc;
1799
1800	rc = efx_mcdi_read_assertion(efx);
1801	if (rc <= 0)
1802		return rc;
1803
1804	return efx_mcdi_exit_assertion(efx);
1805}
1806
1807void efx_mcdi_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
1808{
1809	MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_ID_LED_IN_LEN);
1810	int rc;
1811
1812	BUILD_BUG_ON(EFX_LED_OFF != MC_CMD_LED_OFF);
1813	BUILD_BUG_ON(EFX_LED_ON != MC_CMD_LED_ON);
1814	BUILD_BUG_ON(EFX_LED_DEFAULT != MC_CMD_LED_DEFAULT);
1815
1816	BUILD_BUG_ON(MC_CMD_SET_ID_LED_OUT_LEN != 0);
1817
1818	MCDI_SET_DWORD(inbuf, SET_ID_LED_IN_STATE, mode);
1819
1820	rc = efx_mcdi_rpc(efx, MC_CMD_SET_ID_LED, inbuf, sizeof(inbuf),
1821			  NULL, 0, NULL);
1822}
1823
1824static int efx_mcdi_reset_func(struct efx_nic *efx)
1825{
1826	MCDI_DECLARE_BUF(inbuf, MC_CMD_ENTITY_RESET_IN_LEN);
1827	int rc;
1828
1829	BUILD_BUG_ON(MC_CMD_ENTITY_RESET_OUT_LEN != 0);
1830	MCDI_POPULATE_DWORD_1(inbuf, ENTITY_RESET_IN_FLAG,
1831			      ENTITY_RESET_IN_FUNCTION_RESOURCE_RESET, 1);
1832	rc = efx_mcdi_rpc(efx, MC_CMD_ENTITY_RESET, inbuf, sizeof(inbuf),
1833			  NULL, 0, NULL);
1834	return rc;
1835}
1836
1837static int efx_mcdi_reset_mc(struct efx_nic *efx)
1838{
1839	MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1840	int rc;
1841
1842	BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1843	MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS, 0);
1844	rc = efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, sizeof(inbuf),
1845			  NULL, 0, NULL);
1846	/* White is black, and up is down */
1847	if (rc == -EIO)
1848		return 0;
1849	if (rc == 0)
1850		rc = -EIO;
1851	return rc;
1852}
1853
1854enum reset_type efx_mcdi_map_reset_reason(enum reset_type reason)
1855{
1856	return RESET_TYPE_RECOVER_OR_ALL;
1857}
1858
1859int efx_mcdi_reset(struct efx_nic *efx, enum reset_type method)
1860{
1861	int rc;
1862
1863	/* If MCDI is down, we can't handle_assertion */
1864	if (method == RESET_TYPE_MCDI_TIMEOUT) {
1865		rc = pci_reset_function(efx->pci_dev);
1866		if (rc)
1867			return rc;
1868		/* Re-enable polled MCDI completion */
1869		if (efx->mcdi) {
1870			struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1871			mcdi->mode = MCDI_MODE_POLL;
1872		}
1873		return 0;
1874	}
1875
1876	/* Recover from a failed assertion pre-reset */
1877	rc = efx_mcdi_handle_assertion(efx);
1878	if (rc)
1879		return rc;
1880
1881	if (method == RESET_TYPE_DATAPATH)
1882		return 0;
1883	else if (method == RESET_TYPE_WORLD)
1884		return efx_mcdi_reset_mc(efx);
1885	else
1886		return efx_mcdi_reset_func(efx);
1887}
1888
1889static int efx_mcdi_wol_filter_set(struct efx_nic *efx, u32 type,
1890				   const u8 *mac, int *id_out)
1891{
1892	MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_SET_IN_LEN);
1893	MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_SET_OUT_LEN);
1894	size_t outlen;
1895	int rc;
1896
1897	MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_WOL_TYPE, type);
1898	MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_FILTER_MODE,
1899		       MC_CMD_FILTER_MODE_SIMPLE);
1900	ether_addr_copy(MCDI_PTR(inbuf, WOL_FILTER_SET_IN_MAGIC_MAC), mac);
1901
1902	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_SET, inbuf, sizeof(inbuf),
1903			  outbuf, sizeof(outbuf), &outlen);
1904	if (rc)
1905		goto fail;
1906
1907	if (outlen < MC_CMD_WOL_FILTER_SET_OUT_LEN) {
1908		rc = -EIO;
1909		goto fail;
1910	}
1911
1912	*id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_SET_OUT_FILTER_ID);
1913
1914	return 0;
1915
1916fail:
1917	*id_out = -1;
1918	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1919	return rc;
1920
1921}
1922
1923
1924int
1925efx_mcdi_wol_filter_set_magic(struct efx_nic *efx,  const u8 *mac, int *id_out)
1926{
1927	return efx_mcdi_wol_filter_set(efx, MC_CMD_WOL_TYPE_MAGIC, mac, id_out);
1928}
1929
1930
1931int efx_mcdi_wol_filter_get_magic(struct efx_nic *efx, int *id_out)
1932{
1933	MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_GET_OUT_LEN);
1934	size_t outlen;
1935	int rc;
1936
1937	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_GET, NULL, 0,
1938			  outbuf, sizeof(outbuf), &outlen);
1939	if (rc)
1940		goto fail;
1941
1942	if (outlen < MC_CMD_WOL_FILTER_GET_OUT_LEN) {
1943		rc = -EIO;
1944		goto fail;
1945	}
1946
1947	*id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_GET_OUT_FILTER_ID);
1948
1949	return 0;
1950
1951fail:
1952	*id_out = -1;
1953	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1954	return rc;
1955}
1956
1957
1958int efx_mcdi_wol_filter_remove(struct efx_nic *efx, int id)
1959{
1960	MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_REMOVE_IN_LEN);
1961	int rc;
1962
1963	MCDI_SET_DWORD(inbuf, WOL_FILTER_REMOVE_IN_FILTER_ID, (u32)id);
1964
1965	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_REMOVE, inbuf, sizeof(inbuf),
1966			  NULL, 0, NULL);
1967	return rc;
1968}
1969
1970int efx_mcdi_flush_rxqs(struct efx_nic *efx)
1971{
1972	struct efx_channel *channel;
1973	struct efx_rx_queue *rx_queue;
1974	MCDI_DECLARE_BUF(inbuf,
1975			 MC_CMD_FLUSH_RX_QUEUES_IN_LEN(EFX_MAX_CHANNELS));
1976	int rc, count;
1977
1978	BUILD_BUG_ON(EFX_MAX_CHANNELS >
1979		     MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);
1980
1981	count = 0;
1982	efx_for_each_channel(channel, efx) {
1983		efx_for_each_channel_rx_queue(rx_queue, channel) {
1984			if (rx_queue->flush_pending) {
1985				rx_queue->flush_pending = false;
1986				atomic_dec(&efx->rxq_flush_pending);
1987				MCDI_SET_ARRAY_DWORD(
1988					inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
1989					count, efx_rx_queue_index(rx_queue));
1990				count++;
1991			}
1992		}
1993	}
1994
1995	rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
1996			  MC_CMD_FLUSH_RX_QUEUES_IN_LEN(count), NULL, 0, NULL);
1997	WARN_ON(rc < 0);
1998
1999	return rc;
2000}
2001
2002int efx_mcdi_wol_filter_reset(struct efx_nic *efx)
2003{
2004	int rc;
2005
2006	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_RESET, NULL, 0, NULL, 0, NULL);
2007	return rc;
2008}
2009
2010int efx_mcdi_set_workaround(struct efx_nic *efx, u32 type, bool enabled,
2011			    unsigned int *flags)
2012{
2013	MCDI_DECLARE_BUF(inbuf, MC_CMD_WORKAROUND_IN_LEN);
2014	MCDI_DECLARE_BUF(outbuf, MC_CMD_WORKAROUND_EXT_OUT_LEN);
2015	size_t outlen;
2016	int rc;
2017
2018	BUILD_BUG_ON(MC_CMD_WORKAROUND_OUT_LEN != 0);
2019	MCDI_SET_DWORD(inbuf, WORKAROUND_IN_TYPE, type);
2020	MCDI_SET_DWORD(inbuf, WORKAROUND_IN_ENABLED, enabled);
2021	rc = efx_mcdi_rpc(efx, MC_CMD_WORKAROUND, inbuf, sizeof(inbuf),
2022			  outbuf, sizeof(outbuf), &outlen);
2023	if (rc)
2024		return rc;
2025
2026	if (!flags)
2027		return 0;
2028
2029	if (outlen >= MC_CMD_WORKAROUND_EXT_OUT_LEN)
2030		*flags = MCDI_DWORD(outbuf, WORKAROUND_EXT_OUT_FLAGS);
2031	else
2032		*flags = 0;
2033
2034	return 0;
2035}
2036
2037int efx_mcdi_get_workarounds(struct efx_nic *efx, unsigned int *impl_out,
2038			     unsigned int *enabled_out)
2039{
2040	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_WORKAROUNDS_OUT_LEN);
2041	size_t outlen;
2042	int rc;
2043
2044	rc = efx_mcdi_rpc(efx, MC_CMD_GET_WORKAROUNDS, NULL, 0,
2045			  outbuf, sizeof(outbuf), &outlen);
2046	if (rc)
2047		goto fail;
2048
2049	if (outlen < MC_CMD_GET_WORKAROUNDS_OUT_LEN) {
2050		rc = -EIO;
2051		goto fail;
2052	}
2053
2054	if (impl_out)
2055		*impl_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_IMPLEMENTED);
2056
2057	if (enabled_out)
2058		*enabled_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_ENABLED);
2059
2060	return 0;
2061
2062fail:
2063	/* Older firmware lacks GET_WORKAROUNDS and this isn't especially
2064	 * terrifying.  The call site will have to deal with it though.
2065	 */
2066	netif_cond_dbg(efx, hw, efx->net_dev, rc == -ENOSYS, err,
2067		       "%s: failed rc=%d\n", __func__, rc);
2068	return rc;
2069}
2070
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2071#ifdef CONFIG_SFC_MTD
2072
2073#define EFX_MCDI_NVRAM_LEN_MAX 128
2074
2075static int efx_mcdi_nvram_update_start(struct efx_nic *efx, unsigned int type)
2076{
2077	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_START_IN_LEN);
2078	int rc;
2079
2080	MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_START_IN_TYPE, type);
 
 
 
2081
2082	BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_START_OUT_LEN != 0);
2083
2084	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_START, inbuf, sizeof(inbuf),
2085			  NULL, 0, NULL);
 
2086	return rc;
2087}
2088
2089static int efx_mcdi_nvram_read(struct efx_nic *efx, unsigned int type,
2090			       loff_t offset, u8 *buffer, size_t length)
2091{
2092	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_READ_IN_LEN);
2093	MCDI_DECLARE_BUF(outbuf,
2094			 MC_CMD_NVRAM_READ_OUT_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2095	size_t outlen;
2096	int rc;
2097
2098	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_TYPE, type);
2099	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_OFFSET, offset);
2100	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_LENGTH, length);
 
 
2101
2102	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_READ, inbuf, sizeof(inbuf),
2103			  outbuf, sizeof(outbuf), &outlen);
2104	if (rc)
2105		return rc;
2106
2107	memcpy(buffer, MCDI_PTR(outbuf, NVRAM_READ_OUT_READ_BUFFER), length);
2108	return 0;
2109}
2110
2111static int efx_mcdi_nvram_write(struct efx_nic *efx, unsigned int type,
2112				loff_t offset, const u8 *buffer, size_t length)
2113{
2114	MCDI_DECLARE_BUF(inbuf,
2115			 MC_CMD_NVRAM_WRITE_IN_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2116	int rc;
2117
2118	MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_TYPE, type);
2119	MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_OFFSET, offset);
2120	MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_LENGTH, length);
2121	memcpy(MCDI_PTR(inbuf, NVRAM_WRITE_IN_WRITE_BUFFER), buffer, length);
2122
2123	BUILD_BUG_ON(MC_CMD_NVRAM_WRITE_OUT_LEN != 0);
2124
2125	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_WRITE, inbuf,
2126			  ALIGN(MC_CMD_NVRAM_WRITE_IN_LEN(length), 4),
2127			  NULL, 0, NULL);
2128	return rc;
2129}
2130
2131static int efx_mcdi_nvram_erase(struct efx_nic *efx, unsigned int type,
2132				loff_t offset, size_t length)
2133{
2134	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_ERASE_IN_LEN);
2135	int rc;
2136
2137	MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_TYPE, type);
2138	MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_OFFSET, offset);
2139	MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_LENGTH, length);
2140
2141	BUILD_BUG_ON(MC_CMD_NVRAM_ERASE_OUT_LEN != 0);
2142
2143	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_ERASE, inbuf, sizeof(inbuf),
2144			  NULL, 0, NULL);
2145	return rc;
2146}
2147
2148static int efx_mcdi_nvram_update_finish(struct efx_nic *efx, unsigned int type)
2149{
2150	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_FINISH_IN_LEN);
2151	int rc;
 
 
2152
2153	MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_FINISH_IN_TYPE, type);
2154
2155	BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_FINISH_OUT_LEN != 0);
 
 
2156
2157	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_FINISH, inbuf, sizeof(inbuf),
2158			  NULL, 0, NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2159	return rc;
2160}
2161
2162int efx_mcdi_mtd_read(struct mtd_info *mtd, loff_t start,
2163		      size_t len, size_t *retlen, u8 *buffer)
2164{
2165	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2166	struct efx_nic *efx = mtd->priv;
2167	loff_t offset = start;
2168	loff_t end = min_t(loff_t, start + len, mtd->size);
2169	size_t chunk;
2170	int rc = 0;
2171
2172	while (offset < end) {
2173		chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2174		rc = efx_mcdi_nvram_read(efx, part->nvram_type, offset,
2175					 buffer, chunk);
2176		if (rc)
2177			goto out;
2178		offset += chunk;
2179		buffer += chunk;
2180	}
2181out:
2182	*retlen = offset - start;
2183	return rc;
2184}
2185
2186int efx_mcdi_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
2187{
2188	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2189	struct efx_nic *efx = mtd->priv;
2190	loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
2191	loff_t end = min_t(loff_t, start + len, mtd->size);
2192	size_t chunk = part->common.mtd.erasesize;
2193	int rc = 0;
2194
2195	if (!part->updating) {
2196		rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2197		if (rc)
2198			goto out;
2199		part->updating = true;
2200	}
2201
2202	/* The MCDI interface can in fact do multiple erase blocks at once;
2203	 * but erasing may be slow, so we make multiple calls here to avoid
2204	 * tripping the MCDI RPC timeout. */
2205	while (offset < end) {
2206		rc = efx_mcdi_nvram_erase(efx, part->nvram_type, offset,
2207					  chunk);
2208		if (rc)
2209			goto out;
2210		offset += chunk;
2211	}
2212out:
2213	return rc;
2214}
2215
2216int efx_mcdi_mtd_write(struct mtd_info *mtd, loff_t start,
2217		       size_t len, size_t *retlen, const u8 *buffer)
2218{
2219	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2220	struct efx_nic *efx = mtd->priv;
2221	loff_t offset = start;
2222	loff_t end = min_t(loff_t, start + len, mtd->size);
2223	size_t chunk;
2224	int rc = 0;
2225
2226	if (!part->updating) {
2227		rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2228		if (rc)
2229			goto out;
2230		part->updating = true;
2231	}
2232
2233	while (offset < end) {
2234		chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2235		rc = efx_mcdi_nvram_write(efx, part->nvram_type, offset,
2236					  buffer, chunk);
2237		if (rc)
2238			goto out;
2239		offset += chunk;
2240		buffer += chunk;
2241	}
2242out:
2243	*retlen = offset - start;
2244	return rc;
2245}
2246
2247int efx_mcdi_mtd_sync(struct mtd_info *mtd)
2248{
2249	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2250	struct efx_nic *efx = mtd->priv;
2251	int rc = 0;
2252
2253	if (part->updating) {
2254		part->updating = false;
2255		rc = efx_mcdi_nvram_update_finish(efx, part->nvram_type);
2256	}
2257
2258	return rc;
2259}
2260
2261void efx_mcdi_mtd_rename(struct efx_mtd_partition *part)
2262{
2263	struct efx_mcdi_mtd_partition *mcdi_part =
2264		container_of(part, struct efx_mcdi_mtd_partition, common);
2265	struct efx_nic *efx = part->mtd.priv;
2266
2267	snprintf(part->name, sizeof(part->name), "%s %s:%02x",
2268		 efx->name, part->type_name, mcdi_part->fw_subtype);
2269}
2270
2271#endif /* CONFIG_SFC_MTD */