1// SPDX-License-Identifier: GPL-2.0-only
   2/****************************************************************************
   3 * Driver for Solarflare network controllers and boards
   4 * Copyright 2008-2013 Solarflare Communications Inc.
 
 
 
 
   5 */
   6
   7#include <linux/delay.h>
   8#include <linux/moduleparam.h>
   9#include <linux/atomic.h>
  10#include "net_driver.h"
  11#include "nic.h"
  12#include "io.h"
  13#include "farch_regs.h"
  14#include "mcdi_pcol.h"
  15
  16/**************************************************************************
  17 *
  18 * Management-Controller-to-Driver Interface
  19 *
  20 **************************************************************************
  21 */
  22
  23#define MCDI_RPC_TIMEOUT       (10 * HZ)
  24
  25/* A reboot/assertion causes the MCDI status word to be set after the
  26 * command word is set or a REBOOT event is sent. If we notice a reboot
  27 * via these mechanisms then wait 250ms for the status word to be set.
  28 */
  29#define MCDI_STATUS_DELAY_US		100
  30#define MCDI_STATUS_DELAY_COUNT		2500
  31#define MCDI_STATUS_SLEEP_MS						\
  32	(MCDI_STATUS_DELAY_US * MCDI_STATUS_DELAY_COUNT / 1000)
  33
  34#define SEQ_MASK							\
  35	EFX_MASK32(EFX_WIDTH(MCDI_HEADER_SEQ))
  36
  37struct efx_mcdi_async_param {
  38	struct list_head list;
  39	unsigned int cmd;
  40	size_t inlen;
  41	size_t outlen;
  42	bool quiet;
  43	efx_mcdi_async_completer *complete;
  44	unsigned long cookie;
  45	/* followed by request/response buffer */
  46};
  47
  48static void efx_mcdi_timeout_async(struct timer_list *t);
  49static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
  50			       bool *was_attached_out);
  51static bool efx_mcdi_poll_once(struct efx_nic *efx);
  52static void efx_mcdi_abandon(struct efx_nic *efx);
  53
  54#ifdef CONFIG_SFC_MCDI_LOGGING
  55static bool mcdi_logging_default;
  56module_param(mcdi_logging_default, bool, 0644);
  57MODULE_PARM_DESC(mcdi_logging_default,
  58		 "Enable MCDI logging on newly-probed functions");
  59#endif
  60
  61int efx_mcdi_init(struct efx_nic *efx)
  62{
  63	struct efx_mcdi_iface *mcdi;
  64	bool already_attached;
  65	int rc = -ENOMEM;
  66
  67	efx->mcdi = kzalloc(sizeof(*efx->mcdi), GFP_KERNEL);
  68	if (!efx->mcdi)
  69		goto fail;
  70
  71	mcdi = efx_mcdi(efx);
  72	mcdi->efx = efx;
  73#ifdef CONFIG_SFC_MCDI_LOGGING
  74	/* consuming code assumes buffer is page-sized */
  75	mcdi->logging_buffer = (char *)__get_free_page(GFP_KERNEL);
  76	if (!mcdi->logging_buffer)
  77		goto fail1;
  78	mcdi->logging_enabled = mcdi_logging_default;
  79#endif
  80	init_waitqueue_head(&mcdi->wq);
  81	init_waitqueue_head(&mcdi->proxy_rx_wq);
  82	spin_lock_init(&mcdi->iface_lock);
  83	mcdi->state = MCDI_STATE_QUIESCENT;
  84	mcdi->mode = MCDI_MODE_POLL;
  85	spin_lock_init(&mcdi->async_lock);
  86	INIT_LIST_HEAD(&mcdi->async_list);
  87	timer_setup(&mcdi->async_timer, efx_mcdi_timeout_async, 0);
 
  88
  89	(void) efx_mcdi_poll_reboot(efx);
  90	mcdi->new_epoch = true;
  91
  92	/* Recover from a failed assertion before probing */
  93	rc = efx_mcdi_handle_assertion(efx);
  94	if (rc)
  95		goto fail2;
  96
  97	/* Let the MC (and BMC, if this is a LOM) know that the driver
  98	 * is loaded. We should do this before we reset the NIC.
  99	 */
 100	rc = efx_mcdi_drv_attach(efx, true, &already_attached);
 101	if (rc) {
 102		pci_err(efx->pci_dev, "Unable to register driver with MCPU\n");
 
 103		goto fail2;
 104	}
 105	if (already_attached)
 106		/* Not a fatal error */
 107		pci_err(efx->pci_dev, "Host already registered with MCPU\n");
 
 108
 109	if (efx->mcdi->fn_flags &
 110	    (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY))
 111		efx->primary = efx;
 112
 113	return 0;
 114fail2:
 115#ifdef CONFIG_SFC_MCDI_LOGGING
 116	free_page((unsigned long)mcdi->logging_buffer);
 117fail1:
 118#endif
 119	kfree(efx->mcdi);
 120	efx->mcdi = NULL;
 121fail:
 122	return rc;
 123}
 124
 125void efx_mcdi_detach(struct efx_nic *efx)
 126{
 127	if (!efx->mcdi)
 128		return;
 129
 130	BUG_ON(efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);
 131
 132	/* Relinquish the device (back to the BMC, if this is a LOM) */
 133	efx_mcdi_drv_attach(efx, false, NULL);
 134}
 135
 136void efx_mcdi_fini(struct efx_nic *efx)
 137{
 138	if (!efx->mcdi)
 139		return;
 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	seqno = mcdi->seqno & SEQ_MASK;
 165	spin_unlock_bh(&mcdi->iface_lock);
 166
 
 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 += scnprintf(buf + bytes, PAGE_SIZE - bytes,
 214					   " %08x",
 215					   le32_to_cpu(hdr[i].u32[0]));
 216
 217		for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++)
 218			bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
 219					   " %08x",
 220					   le32_to_cpu(inbuf[i].u32[0]));
 221
 222		netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
 223	}
 224#endif
 225
 226	efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);
 227
 228	mcdi->new_epoch = false;
 229}
 230
 231static int efx_mcdi_errno(unsigned int mcdi_err)
 232{
 233	switch (mcdi_err) {
 234	case 0:
 235		return 0;
 236#define TRANSLATE_ERROR(name)					\
 237	case MC_CMD_ERR_ ## name:				\
 238		return -name;
 239	TRANSLATE_ERROR(EPERM);
 240	TRANSLATE_ERROR(ENOENT);
 241	TRANSLATE_ERROR(EINTR);
 242	TRANSLATE_ERROR(EAGAIN);
 243	TRANSLATE_ERROR(EACCES);
 244	TRANSLATE_ERROR(EBUSY);
 245	TRANSLATE_ERROR(EINVAL);
 246	TRANSLATE_ERROR(EDEADLK);
 247	TRANSLATE_ERROR(ENOSYS);
 248	TRANSLATE_ERROR(ETIME);
 249	TRANSLATE_ERROR(EALREADY);
 250	TRANSLATE_ERROR(ENOSPC);
 251#undef TRANSLATE_ERROR
 252	case MC_CMD_ERR_ENOTSUP:
 253		return -EOPNOTSUPP;
 254	case MC_CMD_ERR_ALLOC_FAIL:
 255		return -ENOBUFS;
 256	case MC_CMD_ERR_MAC_EXIST:
 257		return -EADDRINUSE;
 258	default:
 259		return -EPROTO;
 260	}
 261}
 262
 263static void efx_mcdi_read_response_header(struct efx_nic *efx)
 264{
 265	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 266	unsigned int respseq, respcmd, error;
 267#ifdef CONFIG_SFC_MCDI_LOGGING
 268	char *buf = mcdi->logging_buffer; /* page-sized */
 269#endif
 270	efx_dword_t hdr;
 271
 272	efx->type->mcdi_read_response(efx, &hdr, 0, 4);
 273	respseq = EFX_DWORD_FIELD(hdr, MCDI_HEADER_SEQ);
 274	respcmd = EFX_DWORD_FIELD(hdr, MCDI_HEADER_CODE);
 275	error = EFX_DWORD_FIELD(hdr, MCDI_HEADER_ERROR);
 276
 277	if (respcmd != MC_CMD_V2_EXTN) {
 278		mcdi->resp_hdr_len = 4;
 279		mcdi->resp_data_len = EFX_DWORD_FIELD(hdr, MCDI_HEADER_DATALEN);
 280	} else {
 281		efx->type->mcdi_read_response(efx, &hdr, 4, 4);
 282		mcdi->resp_hdr_len = 8;
 283		mcdi->resp_data_len =
 284			EFX_DWORD_FIELD(hdr, MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
 285	}
 286
 287#ifdef CONFIG_SFC_MCDI_LOGGING
 288	if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
 289		size_t hdr_len, data_len;
 290		int bytes = 0;
 291		int i;
 292
 293		WARN_ON_ONCE(mcdi->resp_hdr_len % 4);
 294		hdr_len = mcdi->resp_hdr_len / 4;
 295		/* MCDI_DECLARE_BUF ensures that underlying buffer is padded
 296		 * to dword size, and the MCDI buffer is always dword size
 297		 */
 298		data_len = DIV_ROUND_UP(mcdi->resp_data_len, 4);
 299
 300		/* We own the logging buffer, as only one MCDI can be in
 301		 * progress on a NIC at any one time.  So no need for locking.
 302		 */
 303		for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
 304			efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4);
 305			bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
 306					   " %08x", le32_to_cpu(hdr.u32[0]));
 307		}
 308
 309		for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
 310			efx->type->mcdi_read_response(efx, &hdr,
 311					mcdi->resp_hdr_len + (i * 4), 4);
 312			bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
 313					   " %08x", le32_to_cpu(hdr.u32[0]));
 314		}
 315
 316		netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf);
 317	}
 318#endif
 319
 320	mcdi->resprc_raw = 0;
 321	if (error && mcdi->resp_data_len == 0) {
 322		netif_err(efx, hw, efx->net_dev, "MC rebooted\n");
 323		mcdi->resprc = -EIO;
 324	} else if ((respseq ^ mcdi->seqno) & SEQ_MASK) {
 325		netif_err(efx, hw, efx->net_dev,
 326			  "MC response mismatch tx seq 0x%x rx seq 0x%x\n",
 327			  respseq, mcdi->seqno);
 328		mcdi->resprc = -EIO;
 329	} else if (error) {
 330		efx->type->mcdi_read_response(efx, &hdr, mcdi->resp_hdr_len, 4);
 331		mcdi->resprc_raw = EFX_DWORD_FIELD(hdr, EFX_DWORD_0);
 332		mcdi->resprc = efx_mcdi_errno(mcdi->resprc_raw);
 333	} else {
 334		mcdi->resprc = 0;
 335	}
 336}
 337
 338static bool efx_mcdi_poll_once(struct efx_nic *efx)
 339{
 340	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 341
 342	rmb();
 343	if (!efx->type->mcdi_poll_response(efx))
 344		return false;
 345
 346	spin_lock_bh(&mcdi->iface_lock);
 347	efx_mcdi_read_response_header(efx);
 348	spin_unlock_bh(&mcdi->iface_lock);
 349
 350	return true;
 351}
 352
 353static int efx_mcdi_poll(struct efx_nic *efx)
 354{
 355	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 356	unsigned long time, finish;
 357	unsigned int spins;
 358	int rc;
 359
 360	/* Check for a reboot atomically with respect to efx_mcdi_copyout() */
 361	rc = efx_mcdi_poll_reboot(efx);
 362	if (rc) {
 363		spin_lock_bh(&mcdi->iface_lock);
 364		mcdi->resprc = rc;
 365		mcdi->resp_hdr_len = 0;
 366		mcdi->resp_data_len = 0;
 367		spin_unlock_bh(&mcdi->iface_lock);
 368		return 0;
 369	}
 370
 371	/* Poll for completion. Poll quickly (once a us) for the 1st jiffy,
 372	 * because generally mcdi responses are fast. After that, back off
 373	 * and poll once a jiffy (approximately)
 374	 */
 375	spins = USER_TICK_USEC;
 376	finish = jiffies + MCDI_RPC_TIMEOUT;
 377
 378	while (1) {
 379		if (spins != 0) {
 380			--spins;
 381			udelay(1);
 382		} else {
 383			schedule_timeout_uninterruptible(1);
 384		}
 385
 386		time = jiffies;
 387
 388		if (efx_mcdi_poll_once(efx))
 389			break;
 390
 391		if (time_after(time, finish))
 392			return -ETIMEDOUT;
 393	}
 394
 395	/* Return rc=0 like wait_event_timeout() */
 396	return 0;
 397}
 398
 399/* Test and clear MC-rebooted flag for this port/function; reset
 400 * software state as necessary.
 401 */
 402int efx_mcdi_poll_reboot(struct efx_nic *efx)
 403{
 404	if (!efx->mcdi)
 405		return 0;
 406
 407	return efx->type->mcdi_poll_reboot(efx);
 408}
 409
 410static bool efx_mcdi_acquire_async(struct efx_mcdi_iface *mcdi)
 411{
 412	return cmpxchg(&mcdi->state,
 413		       MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_ASYNC) ==
 414		MCDI_STATE_QUIESCENT;
 415}
 416
 417static void efx_mcdi_acquire_sync(struct efx_mcdi_iface *mcdi)
 418{
 419	/* Wait until the interface becomes QUIESCENT and we win the race
 420	 * to mark it RUNNING_SYNC.
 421	 */
 422	wait_event(mcdi->wq,
 423		   cmpxchg(&mcdi->state,
 424			   MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_SYNC) ==
 425		   MCDI_STATE_QUIESCENT);
 426}
 427
 428static int efx_mcdi_await_completion(struct efx_nic *efx)
 429{
 430	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 431
 432	if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
 433			       MCDI_RPC_TIMEOUT) == 0)
 434		return -ETIMEDOUT;
 435
 436	/* Check if efx_mcdi_set_mode() switched us back to polled completions.
 437	 * In which case, poll for completions directly. If efx_mcdi_ev_cpl()
 438	 * completed the request first, then we'll just end up completing the
 439	 * request again, which is safe.
 440	 *
 441	 * We need an smp_rmb() to synchronise with efx_mcdi_mode_poll(), which
 442	 * wait_event_timeout() implicitly provides.
 443	 */
 444	if (mcdi->mode == MCDI_MODE_POLL)
 445		return efx_mcdi_poll(efx);
 446
 447	return 0;
 448}
 449
 450/* If the interface is RUNNING_SYNC, switch to COMPLETED and wake the
 451 * requester.  Return whether this was done.  Does not take any locks.
 452 */
 453static bool efx_mcdi_complete_sync(struct efx_mcdi_iface *mcdi)
 454{
 455	if (cmpxchg(&mcdi->state,
 456		    MCDI_STATE_RUNNING_SYNC, MCDI_STATE_COMPLETED) ==
 457	    MCDI_STATE_RUNNING_SYNC) {
 458		wake_up(&mcdi->wq);
 459		return true;
 460	}
 461
 462	return false;
 463}
 464
 465static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
 466{
 467	if (mcdi->mode == MCDI_MODE_EVENTS) {
 468		struct efx_mcdi_async_param *async;
 469		struct efx_nic *efx = mcdi->efx;
 470
 471		/* Process the asynchronous request queue */
 472		spin_lock_bh(&mcdi->async_lock);
 473		async = list_first_entry_or_null(
 474			&mcdi->async_list, struct efx_mcdi_async_param, list);
 475		if (async) {
 476			mcdi->state = MCDI_STATE_RUNNING_ASYNC;
 477			efx_mcdi_send_request(efx, async->cmd,
 478					      (const efx_dword_t *)(async + 1),
 479					      async->inlen);
 480			mod_timer(&mcdi->async_timer,
 481				  jiffies + MCDI_RPC_TIMEOUT);
 482		}
 483		spin_unlock_bh(&mcdi->async_lock);
 484
 485		if (async)
 486			return;
 487	}
 488
 489	mcdi->state = MCDI_STATE_QUIESCENT;
 490	wake_up(&mcdi->wq);
 491}
 492
 493/* If the interface is RUNNING_ASYNC, switch to COMPLETED, call the
 494 * asynchronous completion function, and release the interface.
 495 * Return whether this was done.  Must be called in bh-disabled
 496 * context.  Will take iface_lock and async_lock.
 497 */
 498static bool efx_mcdi_complete_async(struct efx_mcdi_iface *mcdi, bool timeout)
 499{
 500	struct efx_nic *efx = mcdi->efx;
 501	struct efx_mcdi_async_param *async;
 502	size_t hdr_len, data_len, err_len;
 503	efx_dword_t *outbuf;
 504	MCDI_DECLARE_BUF_ERR(errbuf);
 505	int rc;
 506
 507	if (cmpxchg(&mcdi->state,
 508		    MCDI_STATE_RUNNING_ASYNC, MCDI_STATE_COMPLETED) !=
 509	    MCDI_STATE_RUNNING_ASYNC)
 510		return false;
 511
 512	spin_lock(&mcdi->iface_lock);
 513	if (timeout) {
 514		/* Ensure that if the completion event arrives later,
 515		 * the seqno check in efx_mcdi_ev_cpl() will fail
 516		 */
 517		++mcdi->seqno;
 518		++mcdi->credits;
 519		rc = -ETIMEDOUT;
 520		hdr_len = 0;
 521		data_len = 0;
 522	} else {
 523		rc = mcdi->resprc;
 524		hdr_len = mcdi->resp_hdr_len;
 525		data_len = mcdi->resp_data_len;
 526	}
 527	spin_unlock(&mcdi->iface_lock);
 528
 529	/* Stop the timer.  In case the timer function is running, we
 530	 * must wait for it to return so that there is no possibility
 531	 * of it aborting the next request.
 532	 */
 533	if (!timeout)
 534		del_timer_sync(&mcdi->async_timer);
 535
 536	spin_lock(&mcdi->async_lock);
 537	async = list_first_entry(&mcdi->async_list,
 538				 struct efx_mcdi_async_param, list);
 539	list_del(&async->list);
 540	spin_unlock(&mcdi->async_lock);
 541
 542	outbuf = (efx_dword_t *)(async + 1);
 543	efx->type->mcdi_read_response(efx, outbuf, hdr_len,
 544				      min(async->outlen, data_len));
 545	if (!timeout && rc && !async->quiet) {
 546		err_len = min(sizeof(errbuf), data_len);
 547		efx->type->mcdi_read_response(efx, errbuf, hdr_len,
 548					      sizeof(errbuf));
 549		efx_mcdi_display_error(efx, async->cmd, async->inlen, errbuf,
 550				       err_len, rc);
 551	}
 552
 553	if (async->complete)
 554		async->complete(efx, async->cookie, rc, outbuf,
 555				min(async->outlen, data_len));
 556	kfree(async);
 557
 558	efx_mcdi_release(mcdi);
 559
 560	return true;
 561}
 562
 563static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
 564			    unsigned int datalen, unsigned int mcdi_err)
 565{
 566	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 567	bool wake = false;
 568
 569	spin_lock(&mcdi->iface_lock);
 570
 571	if ((seqno ^ mcdi->seqno) & SEQ_MASK) {
 572		if (mcdi->credits)
 573			/* The request has been cancelled */
 574			--mcdi->credits;
 575		else
 576			netif_err(efx, hw, efx->net_dev,
 577				  "MC response mismatch tx seq 0x%x rx "
 578				  "seq 0x%x\n", seqno, mcdi->seqno);
 579	} else {
 580		if (efx->type->mcdi_max_ver >= 2) {
 581			/* MCDI v2 responses don't fit in an event */
 582			efx_mcdi_read_response_header(efx);
 583		} else {
 584			mcdi->resprc = efx_mcdi_errno(mcdi_err);
 585			mcdi->resp_hdr_len = 4;
 586			mcdi->resp_data_len = datalen;
 587		}
 588
 589		wake = true;
 590	}
 591
 592	spin_unlock(&mcdi->iface_lock);
 593
 594	if (wake) {
 595		if (!efx_mcdi_complete_async(mcdi, false))
 596			(void) efx_mcdi_complete_sync(mcdi);
 597
 598		/* If the interface isn't RUNNING_ASYNC or
 599		 * RUNNING_SYNC then we've received a duplicate
 600		 * completion after we've already transitioned back to
 601		 * QUIESCENT. [A subsequent invocation would increment
 602		 * seqno, so would have failed the seqno check].
 603		 */
 604	}
 605}
 606
 607static void efx_mcdi_timeout_async(struct timer_list *t)
 608{
 609	struct efx_mcdi_iface *mcdi = from_timer(mcdi, t, async_timer);
 610
 611	efx_mcdi_complete_async(mcdi, true);
 612}
 613
 614static int
 615efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
 616{
 617	if (efx->type->mcdi_max_ver < 0 ||
 618	     (efx->type->mcdi_max_ver < 2 &&
 619	      cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
 620		return -EINVAL;
 621
 622	if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
 623	    (efx->type->mcdi_max_ver < 2 &&
 624	     inlen > MCDI_CTL_SDU_LEN_MAX_V1))
 625		return -EMSGSIZE;
 626
 627	return 0;
 628}
 629
 630static bool efx_mcdi_get_proxy_handle(struct efx_nic *efx,
 631				      size_t hdr_len, size_t data_len,
 632				      u32 *proxy_handle)
 633{
 634	MCDI_DECLARE_BUF_ERR(testbuf);
 635	const size_t buflen = sizeof(testbuf);
 636
 637	if (!proxy_handle || data_len < buflen)
 638		return false;
 639
 640	efx->type->mcdi_read_response(efx, testbuf, hdr_len, buflen);
 641	if (MCDI_DWORD(testbuf, ERR_CODE) == MC_CMD_ERR_PROXY_PENDING) {
 642		*proxy_handle = MCDI_DWORD(testbuf, ERR_PROXY_PENDING_HANDLE);
 643		return true;
 644	}
 645
 646	return false;
 647}
 648
 649static int _efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned int cmd,
 650				size_t inlen,
 651				efx_dword_t *outbuf, size_t outlen,
 652				size_t *outlen_actual, bool quiet,
 653				u32 *proxy_handle, int *raw_rc)
 654{
 655	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 656	MCDI_DECLARE_BUF_ERR(errbuf);
 657	int rc;
 658
 659	if (mcdi->mode == MCDI_MODE_POLL)
 660		rc = efx_mcdi_poll(efx);
 661	else
 662		rc = efx_mcdi_await_completion(efx);
 663
 664	if (rc != 0) {
 665		netif_err(efx, hw, efx->net_dev,
 666			  "MC command 0x%x inlen %d mode %d timed out\n",
 667			  cmd, (int)inlen, mcdi->mode);
 668
 669		if (mcdi->mode == MCDI_MODE_EVENTS && efx_mcdi_poll_once(efx)) {
 670			netif_err(efx, hw, efx->net_dev,
 671				  "MCDI request was completed without an event\n");
 672			rc = 0;
 673		}
 674
 675		efx_mcdi_abandon(efx);
 676
 677		/* Close the race with efx_mcdi_ev_cpl() executing just too late
 678		 * and completing a request we've just cancelled, by ensuring
 679		 * that the seqno check therein fails.
 680		 */
 681		spin_lock_bh(&mcdi->iface_lock);
 682		++mcdi->seqno;
 683		++mcdi->credits;
 684		spin_unlock_bh(&mcdi->iface_lock);
 685	}
 686
 687	if (proxy_handle)
 688		*proxy_handle = 0;
 689
 690	if (rc != 0) {
 691		if (outlen_actual)
 692			*outlen_actual = 0;
 693	} else {
 694		size_t hdr_len, data_len, err_len;
 695
 696		/* At the very least we need a memory barrier here to ensure
 697		 * we pick up changes from efx_mcdi_ev_cpl(). Protect against
 698		 * a spurious efx_mcdi_ev_cpl() running concurrently by
 699		 * acquiring the iface_lock. */
 700		spin_lock_bh(&mcdi->iface_lock);
 701		rc = mcdi->resprc;
 702		if (raw_rc)
 703			*raw_rc = mcdi->resprc_raw;
 704		hdr_len = mcdi->resp_hdr_len;
 705		data_len = mcdi->resp_data_len;
 706		err_len = min(sizeof(errbuf), data_len);
 707		spin_unlock_bh(&mcdi->iface_lock);
 708
 709		BUG_ON(rc > 0);
 710
 711		efx->type->mcdi_read_response(efx, outbuf, hdr_len,
 712					      min(outlen, data_len));
 713		if (outlen_actual)
 714			*outlen_actual = data_len;
 715
 716		efx->type->mcdi_read_response(efx, errbuf, hdr_len, err_len);
 717
 718		if (cmd == MC_CMD_REBOOT && rc == -EIO) {
 719			/* Don't reset if MC_CMD_REBOOT returns EIO */
 720		} else if (rc == -EIO || rc == -EINTR) {
 721			netif_err(efx, hw, efx->net_dev, "MC reboot detected\n");
 722			netif_dbg(efx, hw, efx->net_dev, "MC rebooted during command %d rc %d\n",
 723				  cmd, -rc);
 724			if (efx->type->mcdi_reboot_detected)
 725				efx->type->mcdi_reboot_detected(efx);
 726			efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
 727		} else if (proxy_handle && (rc == -EPROTO) &&
 728			   efx_mcdi_get_proxy_handle(efx, hdr_len, data_len,
 729						     proxy_handle)) {
 730			mcdi->proxy_rx_status = 0;
 731			mcdi->proxy_rx_handle = 0;
 732			mcdi->state = MCDI_STATE_PROXY_WAIT;
 733		} else if (rc && !quiet) {
 734			efx_mcdi_display_error(efx, cmd, inlen, errbuf, err_len,
 735					       rc);
 736		}
 737
 738		if (rc == -EIO || rc == -EINTR) {
 739			msleep(MCDI_STATUS_SLEEP_MS);
 740			efx_mcdi_poll_reboot(efx);
 741			mcdi->new_epoch = true;
 742		}
 743	}
 744
 745	if (!proxy_handle || !*proxy_handle)
 746		efx_mcdi_release(mcdi);
 747	return rc;
 748}
 749
 750static void efx_mcdi_proxy_abort(struct efx_mcdi_iface *mcdi)
 751{
 752	if (mcdi->state == MCDI_STATE_PROXY_WAIT) {
 753		/* Interrupt the proxy wait. */
 754		mcdi->proxy_rx_status = -EINTR;
 755		wake_up(&mcdi->proxy_rx_wq);
 756	}
 757}
 758
 759static void efx_mcdi_ev_proxy_response(struct efx_nic *efx,
 760				       u32 handle, int status)
 761{
 762	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 763
 764	WARN_ON(mcdi->state != MCDI_STATE_PROXY_WAIT);
 765
 766	mcdi->proxy_rx_status = efx_mcdi_errno(status);
 767	/* Ensure the status is written before we update the handle, since the
 768	 * latter is used to check if we've finished.
 769	 */
 770	wmb();
 771	mcdi->proxy_rx_handle = handle;
 772	wake_up(&mcdi->proxy_rx_wq);
 773}
 774
 775static int efx_mcdi_proxy_wait(struct efx_nic *efx, u32 handle, bool quiet)
 776{
 777	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 778	int rc;
 779
 780	/* Wait for a proxy event, or timeout. */
 781	rc = wait_event_timeout(mcdi->proxy_rx_wq,
 782				mcdi->proxy_rx_handle != 0 ||
 783				mcdi->proxy_rx_status == -EINTR,
 784				MCDI_RPC_TIMEOUT);
 785
 786	if (rc <= 0) {
 787		netif_dbg(efx, hw, efx->net_dev,
 788			  "MCDI proxy timeout %d\n", handle);
 789		return -ETIMEDOUT;
 790	} else if (mcdi->proxy_rx_handle != handle) {
 791		netif_warn(efx, hw, efx->net_dev,
 792			   "MCDI proxy unexpected handle %d (expected %d)\n",
 793			   mcdi->proxy_rx_handle, handle);
 794		return -EINVAL;
 795	}
 796
 797	return mcdi->proxy_rx_status;
 798}
 799
 800static int _efx_mcdi_rpc(struct efx_nic *efx, unsigned int cmd,
 801			 const efx_dword_t *inbuf, size_t inlen,
 802			 efx_dword_t *outbuf, size_t outlen,
 803			 size_t *outlen_actual, bool quiet, int *raw_rc)
 804{
 805	u32 proxy_handle = 0; /* Zero is an invalid proxy handle. */
 806	int rc;
 807
 808	if (inbuf && inlen && (inbuf == outbuf)) {
 809		/* The input buffer can't be aliased with the output. */
 810		WARN_ON(1);
 811		return -EINVAL;
 812	}
 813
 814	rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen);
 815	if (rc)
 816		return rc;
 817
 818	rc = _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
 819				  outlen_actual, quiet, &proxy_handle, raw_rc);
 820
 821	if (proxy_handle) {
 822		/* Handle proxy authorisation. This allows approval of MCDI
 823		 * operations to be delegated to the admin function, allowing
 824		 * fine control over (eg) multicast subscriptions.
 825		 */
 826		struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 827
 828		netif_dbg(efx, hw, efx->net_dev,
 829			  "MCDI waiting for proxy auth %d\n",
 830			  proxy_handle);
 831		rc = efx_mcdi_proxy_wait(efx, proxy_handle, quiet);
 832
 833		if (rc == 0) {
 834			netif_dbg(efx, hw, efx->net_dev,
 835				  "MCDI proxy retry %d\n", proxy_handle);
 836
 837			/* We now retry the original request. */
 838			mcdi->state = MCDI_STATE_RUNNING_SYNC;
 839			efx_mcdi_send_request(efx, cmd, inbuf, inlen);
 840
 841			rc = _efx_mcdi_rpc_finish(efx, cmd, inlen,
 842						  outbuf, outlen, outlen_actual,
 843						  quiet, NULL, raw_rc);
 844		} else {
 845			netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
 846				       "MC command 0x%x failed after proxy auth rc=%d\n",
 847				       cmd, rc);
 
 
 848
 849			if (rc == -EINTR || rc == -EIO)
 850				efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
 851			efx_mcdi_release(mcdi);
 852		}
 853	}
 854
 855	return rc;
 856}
 857
 858static int _efx_mcdi_rpc_evb_retry(struct efx_nic *efx, unsigned cmd,
 859				   const efx_dword_t *inbuf, size_t inlen,
 860				   efx_dword_t *outbuf, size_t outlen,
 861				   size_t *outlen_actual, bool quiet)
 862{
 863	int raw_rc = 0;
 864	int rc;
 865
 866	rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
 867			   outbuf, outlen, outlen_actual, true, &raw_rc);
 868
 869	if ((rc == -EPROTO) && (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
 870	    efx->type->is_vf) {
 871		/* If the EVB port isn't available within a VF this may
 872		 * mean the PF is still bringing the switch up. We should
 873		 * retry our request shortly.
 874		 */
 875		unsigned long abort_time = jiffies + MCDI_RPC_TIMEOUT;
 876		unsigned int delay_us = 10000;
 877
 878		netif_dbg(efx, hw, efx->net_dev,
 879			  "%s: NO_EVB_PORT; will retry request\n",
 880			  __func__);
 881
 882		do {
 883			usleep_range(delay_us, delay_us + 10000);
 884			rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
 885					   outbuf, outlen, outlen_actual,
 886					   true, &raw_rc);
 887			if (delay_us < 100000)
 888				delay_us <<= 1;
 889		} while ((rc == -EPROTO) &&
 890			 (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
 891			 time_before(jiffies, abort_time));
 892	}
 893
 894	if (rc && !quiet && !(cmd == MC_CMD_REBOOT && rc == -EIO))
 895		efx_mcdi_display_error(efx, cmd, inlen,
 896				       outbuf, outlen, rc);
 897
 898	return rc;
 899}
 900
 901/**
 902 * efx_mcdi_rpc - Issue an MCDI command and wait for completion
 903 * @efx: NIC through which to issue the command
 904 * @cmd: Command type number
 905 * @inbuf: Command parameters
 906 * @inlen: Length of command parameters, in bytes.  Must be a multiple
 907 *	of 4 and no greater than %MCDI_CTL_SDU_LEN_MAX_V1.
 908 * @outbuf: Response buffer.  May be %NULL if @outlen is 0.
 909 * @outlen: Length of response buffer, in bytes.  If the actual
 910 *	response is longer than @outlen & ~3, it will be truncated
 911 *	to that length.
 912 * @outlen_actual: Pointer through which to return the actual response
 913 *	length.  May be %NULL if this is not needed.
 914 *
 915 * This function may sleep and therefore must be called in an appropriate
 916 * context.
 917 *
 918 * Return: A negative error code, or zero if successful.  The error
 919 *	code may come from the MCDI response or may indicate a failure
 920 *	to communicate with the MC.  In the former case, the response
 921 *	will still be copied to @outbuf and *@outlen_actual will be
 922 *	set accordingly.  In the latter case, *@outlen_actual will be
 923 *	set to zero.
 924 */
 925int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
 926		 const efx_dword_t *inbuf, size_t inlen,
 927		 efx_dword_t *outbuf, size_t outlen,
 928		 size_t *outlen_actual)
 929{
 930	return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
 931				       outlen_actual, false);
 932}
 933
 934/* Normally, on receiving an error code in the MCDI response,
 935 * efx_mcdi_rpc will log an error message containing (among other
 936 * things) the raw error code, by means of efx_mcdi_display_error.
 937 * This _quiet version suppresses that; if the caller wishes to log
 938 * the error conditionally on the return code, it should call this
 939 * function and is then responsible for calling efx_mcdi_display_error
 940 * as needed.
 941 */
 942int efx_mcdi_rpc_quiet(struct efx_nic *efx, unsigned cmd,
 943		       const efx_dword_t *inbuf, size_t inlen,
 944		       efx_dword_t *outbuf, size_t outlen,
 945		       size_t *outlen_actual)
 946{
 947	return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
 948				       outlen_actual, true);
 949}
 950
 951int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
 952		       const efx_dword_t *inbuf, size_t inlen)
 953{
 954	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 955	int rc;
 956
 957	rc = efx_mcdi_check_supported(efx, cmd, inlen);
 958	if (rc)
 959		return rc;
 960
 961	if (efx->mc_bist_for_other_fn)
 962		return -ENETDOWN;
 963
 964	if (mcdi->mode == MCDI_MODE_FAIL)
 965		return -ENETDOWN;
 966
 967	efx_mcdi_acquire_sync(mcdi);
 968	efx_mcdi_send_request(efx, cmd, inbuf, inlen);
 969	return 0;
 970}
 971
 972static int _efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
 973			       const efx_dword_t *inbuf, size_t inlen,
 974			       size_t outlen,
 975			       efx_mcdi_async_completer *complete,
 976			       unsigned long cookie, bool quiet)
 977{
 978	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
 979	struct efx_mcdi_async_param *async;
 980	int rc;
 981
 982	rc = efx_mcdi_check_supported(efx, cmd, inlen);
 983	if (rc)
 984		return rc;
 985
 986	if (efx->mc_bist_for_other_fn)
 987		return -ENETDOWN;
 988
 989	async = kmalloc(sizeof(*async) + ALIGN(max(inlen, outlen), 4),
 990			GFP_ATOMIC);
 991	if (!async)
 992		return -ENOMEM;
 993
 994	async->cmd = cmd;
 995	async->inlen = inlen;
 996	async->outlen = outlen;
 997	async->quiet = quiet;
 998	async->complete = complete;
 999	async->cookie = cookie;
1000	memcpy(async + 1, inbuf, inlen);
1001
1002	spin_lock_bh(&mcdi->async_lock);
1003
1004	if (mcdi->mode == MCDI_MODE_EVENTS) {
1005		list_add_tail(&async->list, &mcdi->async_list);
1006
1007		/* If this is at the front of the queue, try to start it
1008		 * immediately
1009		 */
1010		if (mcdi->async_list.next == &async->list &&
1011		    efx_mcdi_acquire_async(mcdi)) {
1012			efx_mcdi_send_request(efx, cmd, inbuf, inlen);
1013			mod_timer(&mcdi->async_timer,
1014				  jiffies + MCDI_RPC_TIMEOUT);
1015		}
1016	} else {
1017		kfree(async);
1018		rc = -ENETDOWN;
1019	}
1020
1021	spin_unlock_bh(&mcdi->async_lock);
1022
1023	return rc;
1024}
1025
1026/**
1027 * efx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously
1028 * @efx: NIC through which to issue the command
1029 * @cmd: Command type number
1030 * @inbuf: Command parameters
1031 * @inlen: Length of command parameters, in bytes
1032 * @outlen: Length to allocate for response buffer, in bytes
1033 * @complete: Function to be called on completion or cancellation.
1034 * @cookie: Arbitrary value to be passed to @complete.
1035 *
1036 * This function does not sleep and therefore may be called in atomic
1037 * context.  It will fail if event queues are disabled or if MCDI
1038 * event completions have been disabled due to an error.
1039 *
1040 * If it succeeds, the @complete function will be called exactly once
1041 * in atomic context, when one of the following occurs:
1042 * (a) the completion event is received (in NAPI context)
1043 * (b) event queues are disabled (in the process that disables them)
1044 * (c) the request times-out (in timer context)
1045 */
1046int
1047efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
1048		   const efx_dword_t *inbuf, size_t inlen, size_t outlen,
1049		   efx_mcdi_async_completer *complete, unsigned long cookie)
1050{
1051	return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1052				   cookie, false);
1053}
1054
1055int efx_mcdi_rpc_async_quiet(struct efx_nic *efx, unsigned int cmd,
1056			     const efx_dword_t *inbuf, size_t inlen,
1057			     size_t outlen, efx_mcdi_async_completer *complete,
1058			     unsigned long cookie)
1059{
1060	return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete,
1061				   cookie, true);
1062}
1063
1064int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen,
1065			efx_dword_t *outbuf, size_t outlen,
1066			size_t *outlen_actual)
1067{
1068	return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1069				    outlen_actual, false, NULL, NULL);
1070}
1071
1072int efx_mcdi_rpc_finish_quiet(struct efx_nic *efx, unsigned cmd, size_t inlen,
1073			      efx_dword_t *outbuf, size_t outlen,
1074			      size_t *outlen_actual)
1075{
1076	return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
1077				    outlen_actual, true, NULL, NULL);
1078}
1079
1080void efx_mcdi_display_error(struct efx_nic *efx, unsigned cmd,
1081			    size_t inlen, efx_dword_t *outbuf,
1082			    size_t outlen, int rc)
1083{
1084	int code = 0, err_arg = 0;
1085
1086	if (outlen >= MC_CMD_ERR_CODE_OFST + 4)
1087		code = MCDI_DWORD(outbuf, ERR_CODE);
1088	if (outlen >= MC_CMD_ERR_ARG_OFST + 4)
1089		err_arg = MCDI_DWORD(outbuf, ERR_ARG);
1090	netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
1091		       "MC command 0x%x inlen %zu failed rc=%d (raw=%d) arg=%d\n",
1092		       cmd, inlen, rc, code, err_arg);
 
1093}
1094
1095/* Switch to polled MCDI completions.  This can be called in various
1096 * error conditions with various locks held, so it must be lockless.
1097 * Caller is responsible for flushing asynchronous requests later.
1098 */
1099void efx_mcdi_mode_poll(struct efx_nic *efx)
1100{
1101	struct efx_mcdi_iface *mcdi;
1102
1103	if (!efx->mcdi)
1104		return;
1105
1106	mcdi = efx_mcdi(efx);
1107	/* If already in polling mode, nothing to do.
1108	 * If in fail-fast state, don't switch to polled completion.
1109	 * FLR recovery will do that later.
1110	 */
1111	if (mcdi->mode == MCDI_MODE_POLL || mcdi->mode == MCDI_MODE_FAIL)
1112		return;
1113
1114	/* We can switch from event completion to polled completion, because
1115	 * mcdi requests are always completed in shared memory. We do this by
1116	 * switching the mode to POLL'd then completing the request.
1117	 * efx_mcdi_await_completion() will then call efx_mcdi_poll().
1118	 *
1119	 * We need an smp_wmb() to synchronise with efx_mcdi_await_completion(),
1120	 * which efx_mcdi_complete_sync() provides for us.
1121	 */
1122	mcdi->mode = MCDI_MODE_POLL;
1123
1124	efx_mcdi_complete_sync(mcdi);
1125}
1126
1127/* Flush any running or queued asynchronous requests, after event processing
1128 * is stopped
1129 */
1130void efx_mcdi_flush_async(struct efx_nic *efx)
1131{
1132	struct efx_mcdi_async_param *async, *next;
1133	struct efx_mcdi_iface *mcdi;
1134
1135	if (!efx->mcdi)
1136		return;
1137
1138	mcdi = efx_mcdi(efx);
1139
1140	/* We must be in poll or fail mode so no more requests can be queued */
1141	BUG_ON(mcdi->mode == MCDI_MODE_EVENTS);
1142
1143	del_timer_sync(&mcdi->async_timer);
1144
1145	/* If a request is still running, make sure we give the MC
1146	 * time to complete it so that the response won't overwrite our
1147	 * next request.
1148	 */
1149	if (mcdi->state == MCDI_STATE_RUNNING_ASYNC) {
1150		efx_mcdi_poll(efx);
1151		mcdi->state = MCDI_STATE_QUIESCENT;
1152	}
1153
1154	/* Nothing else will access the async list now, so it is safe
1155	 * to walk it without holding async_lock.  If we hold it while
1156	 * calling a completer then lockdep may warn that we have
1157	 * acquired locks in the wrong order.
1158	 */
1159	list_for_each_entry_safe(async, next, &mcdi->async_list, list) {
1160		if (async->complete)
1161			async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
1162		list_del(&async->list);
1163		kfree(async);
1164	}
1165}
1166
1167void efx_mcdi_mode_event(struct efx_nic *efx)
1168{
1169	struct efx_mcdi_iface *mcdi;
1170
1171	if (!efx->mcdi)
1172		return;
1173
1174	mcdi = efx_mcdi(efx);
1175	/* If already in event completion mode, nothing to do.
1176	 * If in fail-fast state, don't switch to event completion.  FLR
1177	 * recovery will do that later.
1178	 */
1179	if (mcdi->mode == MCDI_MODE_EVENTS || mcdi->mode == MCDI_MODE_FAIL)
1180		return;
1181
1182	/* We can't switch from polled to event completion in the middle of a
1183	 * request, because the completion method is specified in the request.
1184	 * So acquire the interface to serialise the requestors. We don't need
1185	 * to acquire the iface_lock to change the mode here, but we do need a
1186	 * write memory barrier ensure that efx_mcdi_rpc() sees it, which
1187	 * efx_mcdi_acquire() provides.
1188	 */
1189	efx_mcdi_acquire_sync(mcdi);
1190	mcdi->mode = MCDI_MODE_EVENTS;
1191	efx_mcdi_release(mcdi);
1192}
1193
1194static void efx_mcdi_ev_death(struct efx_nic *efx, int rc)
1195{
1196	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1197
1198	/* If there is an outstanding MCDI request, it has been terminated
1199	 * either by a BADASSERT or REBOOT event. If the mcdi interface is
1200	 * in polled mode, then do nothing because the MC reboot handler will
1201	 * set the header correctly. However, if the mcdi interface is waiting
1202	 * for a CMDDONE event it won't receive it [and since all MCDI events
1203	 * are sent to the same queue, we can't be racing with
1204	 * efx_mcdi_ev_cpl()]
1205	 *
1206	 * If there is an outstanding asynchronous request, we can't
1207	 * complete it now (efx_mcdi_complete() would deadlock).  The
1208	 * reset process will take care of this.
1209	 *
1210	 * There's a race here with efx_mcdi_send_request(), because
1211	 * we might receive a REBOOT event *before* the request has
1212	 * been copied out. In polled mode (during startup) this is
1213	 * irrelevant, because efx_mcdi_complete_sync() is ignored. In
1214	 * event mode, this condition is just an edge-case of
1215	 * receiving a REBOOT event after posting the MCDI
1216	 * request. Did the mc reboot before or after the copyout? The
1217	 * best we can do always is just return failure.
1218	 *
1219	 * If there is an outstanding proxy response expected it is not going
1220	 * to arrive. We should thus abort it.
1221	 */
1222	spin_lock(&mcdi->iface_lock);
1223	efx_mcdi_proxy_abort(mcdi);
1224
1225	if (efx_mcdi_complete_sync(mcdi)) {
1226		if (mcdi->mode == MCDI_MODE_EVENTS) {
1227			mcdi->resprc = rc;
1228			mcdi->resp_hdr_len = 0;
1229			mcdi->resp_data_len = 0;
1230			++mcdi->credits;
1231		}
1232	} else {
1233		int count;
1234
1235		/* Consume the status word since efx_mcdi_rpc_finish() won't */
1236		for (count = 0; count < MCDI_STATUS_DELAY_COUNT; ++count) {
1237			rc = efx_mcdi_poll_reboot(efx);
1238			if (rc)
1239				break;
1240			udelay(MCDI_STATUS_DELAY_US);
1241		}
1242
1243		/* On EF10, a CODE_MC_REBOOT event can be received without the
1244		 * reboot detection in efx_mcdi_poll_reboot() being triggered.
1245		 * If zero was returned from the final call to
1246		 * efx_mcdi_poll_reboot(), the MC reboot wasn't noticed but the
1247		 * MC has definitely rebooted so prepare for the reset.
1248		 */
1249		if (!rc && efx->type->mcdi_reboot_detected)
1250			efx->type->mcdi_reboot_detected(efx);
1251
1252		mcdi->new_epoch = true;
1253
1254		/* Nobody was waiting for an MCDI request, so trigger a reset */
1255		efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
1256	}
1257
1258	spin_unlock(&mcdi->iface_lock);
1259}
1260
1261/* The MC is going down in to BIST mode. set the BIST flag to block
1262 * new MCDI, cancel any outstanding MCDI and schedule a BIST-type reset
1263 * (which doesn't actually execute a reset, it waits for the controlling
1264 * function to reset it).
1265 */
1266static void efx_mcdi_ev_bist(struct efx_nic *efx)
1267{
1268	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1269
1270	spin_lock(&mcdi->iface_lock);
1271	efx->mc_bist_for_other_fn = true;
1272	efx_mcdi_proxy_abort(mcdi);
1273
1274	if (efx_mcdi_complete_sync(mcdi)) {
1275		if (mcdi->mode == MCDI_MODE_EVENTS) {
1276			mcdi->resprc = -EIO;
1277			mcdi->resp_hdr_len = 0;
1278			mcdi->resp_data_len = 0;
1279			++mcdi->credits;
1280		}
1281	}
1282	mcdi->new_epoch = true;
1283	efx_schedule_reset(efx, RESET_TYPE_MC_BIST);
1284	spin_unlock(&mcdi->iface_lock);
1285}
1286
1287/* MCDI timeouts seen, so make all MCDI calls fail-fast and issue an FLR to try
1288 * to recover.
1289 */
1290static void efx_mcdi_abandon(struct efx_nic *efx)
1291{
1292	struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1293
1294	if (xchg(&mcdi->mode, MCDI_MODE_FAIL) == MCDI_MODE_FAIL)
1295		return; /* it had already been done */
1296	netif_dbg(efx, hw, efx->net_dev, "MCDI is timing out; trying to recover\n");
1297	efx_schedule_reset(efx, RESET_TYPE_MCDI_TIMEOUT);
1298}
1299
1300static void efx_handle_drain_event(struct efx_nic *efx)
1301{
1302	if (atomic_dec_and_test(&efx->active_queues))
1303		wake_up(&efx->flush_wq);
1304
1305	WARN_ON(atomic_read(&efx->active_queues) < 0);
1306}
1307
1308/* Called from efx_farch_ev_process and efx_ef10_ev_process for MCDI events */
1309void efx_mcdi_process_event(struct efx_channel *channel,
1310			    efx_qword_t *event)
1311{
1312	struct efx_nic *efx = channel->efx;
1313	int code = EFX_QWORD_FIELD(*event, MCDI_EVENT_CODE);
1314	u32 data = EFX_QWORD_FIELD(*event, MCDI_EVENT_DATA);
1315
1316	switch (code) {
1317	case MCDI_EVENT_CODE_BADSSERT:
1318		netif_err(efx, hw, efx->net_dev,
1319			  "MC watchdog or assertion failure at 0x%x\n", data);
1320		efx_mcdi_ev_death(efx, -EINTR);
1321		break;
1322
1323	case MCDI_EVENT_CODE_PMNOTICE:
1324		netif_info(efx, wol, efx->net_dev, "MCDI PM event.\n");
1325		break;
1326
1327	case MCDI_EVENT_CODE_CMDDONE:
1328		efx_mcdi_ev_cpl(efx,
1329				MCDI_EVENT_FIELD(*event, CMDDONE_SEQ),
1330				MCDI_EVENT_FIELD(*event, CMDDONE_DATALEN),
1331				MCDI_EVENT_FIELD(*event, CMDDONE_ERRNO));
1332		break;
1333
1334	case MCDI_EVENT_CODE_LINKCHANGE:
1335		efx_mcdi_process_link_change(efx, event);
1336		break;
1337	case MCDI_EVENT_CODE_SENSOREVT:
1338		efx_sensor_event(efx, event);
1339		break;
1340	case MCDI_EVENT_CODE_SCHEDERR:
1341		netif_dbg(efx, hw, efx->net_dev,
1342			  "MC Scheduler alert (0x%x)\n", data);
1343		break;
1344	case MCDI_EVENT_CODE_REBOOT:
1345	case MCDI_EVENT_CODE_MC_REBOOT:
1346		netif_info(efx, hw, efx->net_dev, "MC Reboot\n");
1347		efx_mcdi_ev_death(efx, -EIO);
1348		break;
1349	case MCDI_EVENT_CODE_MC_BIST:
1350		netif_info(efx, hw, efx->net_dev, "MC entered BIST mode\n");
1351		efx_mcdi_ev_bist(efx);
1352		break;
1353	case MCDI_EVENT_CODE_MAC_STATS_DMA:
1354		/* MAC stats are gather lazily.  We can ignore this. */
1355		break;
1356	case MCDI_EVENT_CODE_FLR:
1357		if (efx->type->sriov_flr)
1358			efx->type->sriov_flr(efx,
1359					     MCDI_EVENT_FIELD(*event, FLR_VF));
1360		break;
1361	case MCDI_EVENT_CODE_PTP_RX:
1362	case MCDI_EVENT_CODE_PTP_FAULT:
1363	case MCDI_EVENT_CODE_PTP_PPS:
1364		efx_ptp_event(efx, event);
1365		break;
1366	case MCDI_EVENT_CODE_PTP_TIME:
1367		efx_time_sync_event(channel, event);
1368		break;
1369	case MCDI_EVENT_CODE_TX_FLUSH:
1370	case MCDI_EVENT_CODE_RX_FLUSH:
1371		/* Two flush events will be sent: one to the same event
1372		 * queue as completions, and one to event queue 0.
1373		 * In the latter case the {RX,TX}_FLUSH_TO_DRIVER
1374		 * flag will be set, and we should ignore the event
1375		 * because we want to wait for all completions.
1376		 */
1377		BUILD_BUG_ON(MCDI_EVENT_TX_FLUSH_TO_DRIVER_LBN !=
1378			     MCDI_EVENT_RX_FLUSH_TO_DRIVER_LBN);
1379		if (!MCDI_EVENT_FIELD(*event, TX_FLUSH_TO_DRIVER))
1380			efx_handle_drain_event(efx);
1381		break;
1382	case MCDI_EVENT_CODE_TX_ERR:
1383	case MCDI_EVENT_CODE_RX_ERR:
1384		netif_err(efx, hw, efx->net_dev,
1385			  "%s DMA error (event: "EFX_QWORD_FMT")\n",
1386			  code == MCDI_EVENT_CODE_TX_ERR ? "TX" : "RX",
1387			  EFX_QWORD_VAL(*event));
1388		efx_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
1389		break;
1390	case MCDI_EVENT_CODE_PROXY_RESPONSE:
1391		efx_mcdi_ev_proxy_response(efx,
1392				MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_HANDLE),
1393				MCDI_EVENT_FIELD(*event, PROXY_RESPONSE_RC));
1394		break;
1395	default:
1396		netif_err(efx, hw, efx->net_dev,
1397			  "Unknown MCDI event " EFX_QWORD_FMT "\n",
1398			  EFX_QWORD_VAL(*event));
1399	}
1400}
1401
1402/**************************************************************************
1403 *
1404 * Specific request functions
1405 *
1406 **************************************************************************
1407 */
1408
1409void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
1410{
1411	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_VERSION_OUT_LEN);
1412	size_t outlength;
1413	const __le16 *ver_words;
1414	size_t offset;
1415	int rc;
1416
1417	BUILD_BUG_ON(MC_CMD_GET_VERSION_IN_LEN != 0);
1418	rc = efx_mcdi_rpc(efx, MC_CMD_GET_VERSION, NULL, 0,
1419			  outbuf, sizeof(outbuf), &outlength);
1420	if (rc)
1421		goto fail;
1422	if (outlength < MC_CMD_GET_VERSION_OUT_LEN) {
1423		rc = -EIO;
1424		goto fail;
1425	}
1426
1427	ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION);
1428	offset = scnprintf(buf, len, "%u.%u.%u.%u",
1429			   le16_to_cpu(ver_words[0]),
1430			   le16_to_cpu(ver_words[1]),
1431			   le16_to_cpu(ver_words[2]),
1432			   le16_to_cpu(ver_words[3]));
1433
1434	if (efx->type->print_additional_fwver)
1435		offset += efx->type->print_additional_fwver(efx, buf + offset,
1436							    len - offset);
1437
1438	/* It's theoretically possible for the string to exceed 31
1439	 * characters, though in practice the first three version
1440	 * components are short enough that this doesn't happen.
1441	 */
1442	if (WARN_ON(offset >= len))
1443		buf[0] = 0;
 
 
 
 
 
 
 
 
 
 
 
 
1444
1445	return;
1446
1447fail:
1448	pci_err(efx->pci_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		pci_dbg(efx->pci_dev,
1473			"%s with fw-variant setting failed EPERM, trying without it\n",
1474			__func__);
1475		MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID,
1476			       MC_CMD_FW_DONT_CARE);
1477		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_DRV_ATTACH, inbuf,
1478					sizeof(inbuf), outbuf, sizeof(outbuf),
1479					&outlen);
1480	}
1481	if (rc) {
1482		efx_mcdi_display_error(efx, MC_CMD_DRV_ATTACH, sizeof(inbuf),
1483				       outbuf, outlen, rc);
1484		goto fail;
1485	}
1486	if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN) {
1487		rc = -EIO;
1488		goto fail;
1489	}
1490
1491	if (driver_operating) {
1492		if (outlen >= MC_CMD_DRV_ATTACH_EXT_OUT_LEN) {
1493			efx->mcdi->fn_flags =
1494				MCDI_DWORD(outbuf,
1495					   DRV_ATTACH_EXT_OUT_FUNC_FLAGS);
1496		} else {
1497			/* Synthesise flags for Siena */
1498			efx->mcdi->fn_flags =
1499				1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL |
1500				1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED |
1501				(efx_port_num(efx) == 0) <<
1502				MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY;
1503		}
1504	}
1505
1506	/* We currently assume we have control of the external link
1507	 * and are completely trusted by firmware.  Abort probing
1508	 * if that's not true for this function.
1509	 */
1510
1511	if (was_attached != NULL)
1512		*was_attached = MCDI_DWORD(outbuf, DRV_ATTACH_OUT_OLD_STATE);
1513	return 0;
1514
1515fail:
1516	pci_err(efx->pci_dev, "%s: failed rc=%d\n", __func__, rc);
1517	return rc;
1518}
1519
1520int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
1521			   u16 *fw_subtype_list, u32 *capabilities)
1522{
1523	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_BOARD_CFG_OUT_LENMAX);
1524	size_t outlen, i;
1525	int port_num = efx_port_num(efx);
1526	int rc;
1527
1528	BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_IN_LEN != 0);
1529	/* we need __aligned(2) for ether_addr_copy */
1530	BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0_OFST & 1);
1531	BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1_OFST & 1);
1532
1533	rc = efx_mcdi_rpc(efx, MC_CMD_GET_BOARD_CFG, NULL, 0,
1534			  outbuf, sizeof(outbuf), &outlen);
1535	if (rc)
1536		goto fail;
1537
1538	if (outlen < MC_CMD_GET_BOARD_CFG_OUT_LENMIN) {
1539		rc = -EIO;
1540		goto fail;
1541	}
1542
1543	if (mac_address)
1544		ether_addr_copy(mac_address,
1545				port_num ?
1546				MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1) :
1547				MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0));
1548	if (fw_subtype_list) {
1549		for (i = 0;
1550		     i < MCDI_VAR_ARRAY_LEN(outlen,
1551					    GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST);
1552		     i++)
1553			fw_subtype_list[i] = MCDI_ARRAY_WORD(
1554				outbuf, GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST, i);
1555		for (; i < MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM; i++)
1556			fw_subtype_list[i] = 0;
1557	}
1558	if (capabilities) {
1559		if (port_num)
1560			*capabilities = MCDI_DWORD(outbuf,
1561					GET_BOARD_CFG_OUT_CAPABILITIES_PORT1);
1562		else
1563			*capabilities = MCDI_DWORD(outbuf,
1564					GET_BOARD_CFG_OUT_CAPABILITIES_PORT0);
1565	}
1566
1567	return 0;
1568
1569fail:
1570	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d len=%d\n",
1571		  __func__, rc, (int)outlen);
1572
1573	return rc;
1574}
1575
1576int efx_mcdi_log_ctrl(struct efx_nic *efx, bool evq, bool uart, u32 dest_evq)
1577{
1578	MCDI_DECLARE_BUF(inbuf, MC_CMD_LOG_CTRL_IN_LEN);
1579	u32 dest = 0;
1580	int rc;
1581
1582	if (uart)
1583		dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_UART;
1584	if (evq)
1585		dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_EVQ;
1586
1587	MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST, dest);
1588	MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST_EVQ, dest_evq);
1589
1590	BUILD_BUG_ON(MC_CMD_LOG_CTRL_OUT_LEN != 0);
1591
1592	rc = efx_mcdi_rpc(efx, MC_CMD_LOG_CTRL, inbuf, sizeof(inbuf),
1593			  NULL, 0, NULL);
1594	return rc;
1595}
1596
1597int efx_mcdi_nvram_types(struct efx_nic *efx, u32 *nvram_types_out)
1598{
1599	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TYPES_OUT_LEN);
1600	size_t outlen;
1601	int rc;
1602
1603	BUILD_BUG_ON(MC_CMD_NVRAM_TYPES_IN_LEN != 0);
1604
1605	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TYPES, NULL, 0,
1606			  outbuf, sizeof(outbuf), &outlen);
1607	if (rc)
1608		goto fail;
1609	if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN) {
1610		rc = -EIO;
1611		goto fail;
1612	}
1613
1614	*nvram_types_out = MCDI_DWORD(outbuf, NVRAM_TYPES_OUT_TYPES);
1615	return 0;
1616
1617fail:
1618	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
1619		  __func__, rc);
1620	return rc;
1621}
1622
1623/* This function finds types using the new NVRAM_PARTITIONS mcdi. */
1624static int efx_new_mcdi_nvram_types(struct efx_nic *efx, u32 *number,
1625				    u32 *nvram_types)
1626{
1627	efx_dword_t *outbuf = kzalloc(MC_CMD_NVRAM_PARTITIONS_OUT_LENMAX_MCDI2,
1628				      GFP_KERNEL);
1629	size_t outlen;
1630	int rc;
1631
1632	if (!outbuf)
1633		return -ENOMEM;
1634
1635	BUILD_BUG_ON(MC_CMD_NVRAM_PARTITIONS_IN_LEN != 0);
1636
1637	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_PARTITIONS, NULL, 0,
1638			  outbuf, MC_CMD_NVRAM_PARTITIONS_OUT_LENMAX_MCDI2, &outlen);
1639	if (rc)
1640		goto fail;
1641
1642	*number = MCDI_DWORD(outbuf, NVRAM_PARTITIONS_OUT_NUM_PARTITIONS);
1643
1644	memcpy(nvram_types, MCDI_PTR(outbuf, NVRAM_PARTITIONS_OUT_TYPE_ID),
1645	       *number * sizeof(u32));
1646
1647fail:
1648	kfree(outbuf);
1649	return rc;
1650}
1651
1652int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
1653			size_t *size_out, size_t *erase_size_out,
1654			bool *protected_out)
1655{
1656	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_INFO_IN_LEN);
1657	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_INFO_OUT_LEN);
1658	size_t outlen;
1659	int rc;
1660
1661	MCDI_SET_DWORD(inbuf, NVRAM_INFO_IN_TYPE, type);
1662
1663	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_INFO, inbuf, sizeof(inbuf),
1664			  outbuf, sizeof(outbuf), &outlen);
1665	if (rc)
1666		goto fail;
1667	if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN) {
1668		rc = -EIO;
1669		goto fail;
1670	}
1671
1672	*size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_SIZE);
1673	*erase_size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_ERASESIZE);
1674	*protected_out = !!(MCDI_DWORD(outbuf, NVRAM_INFO_OUT_FLAGS) &
1675				(1 << MC_CMD_NVRAM_INFO_OUT_PROTECTED_LBN));
1676	return 0;
1677
1678fail:
1679	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1680	return rc;
1681}
1682
1683static int efx_mcdi_nvram_test(struct efx_nic *efx, unsigned int type)
1684{
1685	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_TEST_IN_LEN);
1686	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TEST_OUT_LEN);
1687	int rc;
1688
1689	MCDI_SET_DWORD(inbuf, NVRAM_TEST_IN_TYPE, type);
1690
1691	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TEST, inbuf, sizeof(inbuf),
1692			  outbuf, sizeof(outbuf), NULL);
1693	if (rc)
1694		return rc;
1695
1696	switch (MCDI_DWORD(outbuf, NVRAM_TEST_OUT_RESULT)) {
1697	case MC_CMD_NVRAM_TEST_PASS:
1698	case MC_CMD_NVRAM_TEST_NOTSUPP:
1699		return 0;
1700	default:
1701		return -EIO;
1702	}
1703}
1704
1705/* This function tests nvram partitions using the new mcdi partition lookup scheme */
1706int efx_new_mcdi_nvram_test_all(struct efx_nic *efx)
1707{
1708	u32 *nvram_types = kzalloc(MC_CMD_NVRAM_PARTITIONS_OUT_LENMAX_MCDI2,
1709				   GFP_KERNEL);
1710	unsigned int number;
1711	int rc, i;
1712
1713	if (!nvram_types)
1714		return -ENOMEM;
1715
1716	rc = efx_new_mcdi_nvram_types(efx, &number, nvram_types);
1717	if (rc)
1718		goto fail;
1719
1720	/* Require at least one check */
1721	rc = -EAGAIN;
1722
1723	for (i = 0; i < number; i++) {
1724		if (nvram_types[i] == NVRAM_PARTITION_TYPE_PARTITION_MAP ||
1725		    nvram_types[i] == NVRAM_PARTITION_TYPE_DYNAMIC_CONFIG)
1726			continue;
1727
1728		rc = efx_mcdi_nvram_test(efx, nvram_types[i]);
1729		if (rc)
1730			goto fail;
1731	}
1732
1733fail:
1734	kfree(nvram_types);
1735	return rc;
1736}
1737
1738int efx_mcdi_nvram_test_all(struct efx_nic *efx)
1739{
1740	u32 nvram_types;
1741	unsigned int type;
1742	int rc;
1743
1744	rc = efx_mcdi_nvram_types(efx, &nvram_types);
1745	if (rc)
1746		goto fail1;
1747
1748	type = 0;
1749	while (nvram_types != 0) {
1750		if (nvram_types & 1) {
1751			rc = efx_mcdi_nvram_test(efx, type);
1752			if (rc)
1753				goto fail2;
1754		}
1755		type++;
1756		nvram_types >>= 1;
1757	}
1758
1759	return 0;
1760
1761fail2:
1762	netif_err(efx, hw, efx->net_dev, "%s: failed type=%u\n",
1763		  __func__, type);
1764fail1:
1765	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1766	return rc;
1767}
1768
1769/* Returns 1 if an assertion was read, 0 if no assertion had fired,
1770 * negative on error.
1771 */
1772static int efx_mcdi_read_assertion(struct efx_nic *efx)
1773{
1774	MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_ASSERTS_IN_LEN);
1775	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_ASSERTS_OUT_LEN);
1776	unsigned int flags, index;
1777	const char *reason;
1778	size_t outlen;
1779	int retry;
1780	int rc;
1781
1782	/* Attempt to read any stored assertion state before we reboot
1783	 * the mcfw out of the assertion handler. Retry twice, once
1784	 * because a boot-time assertion might cause this command to fail
1785	 * with EINTR. And once again because GET_ASSERTS can race with
1786	 * MC_CMD_REBOOT running on the other port. */
1787	retry = 2;
1788	do {
1789		MCDI_SET_DWORD(inbuf, GET_ASSERTS_IN_CLEAR, 1);
1790		rc = efx_mcdi_rpc_quiet(efx, MC_CMD_GET_ASSERTS,
1791					inbuf, MC_CMD_GET_ASSERTS_IN_LEN,
1792					outbuf, sizeof(outbuf), &outlen);
1793		if (rc == -EPERM)
1794			return 0;
1795	} while ((rc == -EINTR || rc == -EIO) && retry-- > 0);
1796
1797	if (rc) {
1798		efx_mcdi_display_error(efx, MC_CMD_GET_ASSERTS,
1799				       MC_CMD_GET_ASSERTS_IN_LEN, outbuf,
1800				       outlen, rc);
1801		return rc;
1802	}
1803	if (outlen < MC_CMD_GET_ASSERTS_OUT_LEN)
1804		return -EIO;
1805
1806	/* Print out any recorded assertion state */
1807	flags = MCDI_DWORD(outbuf, GET_ASSERTS_OUT_GLOBAL_FLAGS);
1808	if (flags == MC_CMD_GET_ASSERTS_FLAGS_NO_FAILS)
1809		return 0;
1810
1811	reason = (flags == MC_CMD_GET_ASSERTS_FLAGS_SYS_FAIL)
1812		? "system-level assertion"
1813		: (flags == MC_CMD_GET_ASSERTS_FLAGS_THR_FAIL)
1814		? "thread-level assertion"
1815		: (flags == MC_CMD_GET_ASSERTS_FLAGS_WDOG_FIRED)
1816		? "watchdog reset"
1817		: "unknown assertion";
1818	netif_err(efx, hw, efx->net_dev,
1819		  "MCPU %s at PC = 0x%.8x in thread 0x%.8x\n", reason,
1820		  MCDI_DWORD(outbuf, GET_ASSERTS_OUT_SAVED_PC_OFFS),
1821		  MCDI_DWORD(outbuf, GET_ASSERTS_OUT_THREAD_OFFS));
1822
1823	/* Print out the registers */
1824	for (index = 0;
1825	     index < MC_CMD_GET_ASSERTS_OUT_GP_REGS_OFFS_NUM;
1826	     index++)
1827		netif_err(efx, hw, efx->net_dev, "R%.2d (?): 0x%.8x\n",
1828			  1 + index,
1829			  MCDI_ARRAY_DWORD(outbuf, GET_ASSERTS_OUT_GP_REGS_OFFS,
1830					   index));
1831
1832	return 1;
1833}
1834
1835static int efx_mcdi_exit_assertion(struct efx_nic *efx)
1836{
1837	MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1838	int rc;
1839
1840	/* If the MC is running debug firmware, it might now be
1841	 * waiting for a debugger to attach, but we just want it to
1842	 * reboot.  We set a flag that makes the command a no-op if it
1843	 * has already done so.
1844	 * The MCDI will thus return either 0 or -EIO.
1845	 */
1846	BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1847	MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS,
1848		       MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION);
1849	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN,
1850				NULL, 0, NULL);
1851	if (rc == -EIO)
1852		rc = 0;
1853	if (rc)
1854		efx_mcdi_display_error(efx, MC_CMD_REBOOT, MC_CMD_REBOOT_IN_LEN,
1855				       NULL, 0, rc);
1856	return rc;
1857}
1858
1859int efx_mcdi_handle_assertion(struct efx_nic *efx)
1860{
1861	int rc;
1862
1863	rc = efx_mcdi_read_assertion(efx);
1864	if (rc <= 0)
1865		return rc;
1866
1867	return efx_mcdi_exit_assertion(efx);
1868}
1869
1870int efx_mcdi_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
1871{
1872	MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_ID_LED_IN_LEN);
 
1873
1874	BUILD_BUG_ON(EFX_LED_OFF != MC_CMD_LED_OFF);
1875	BUILD_BUG_ON(EFX_LED_ON != MC_CMD_LED_ON);
1876	BUILD_BUG_ON(EFX_LED_DEFAULT != MC_CMD_LED_DEFAULT);
1877
1878	BUILD_BUG_ON(MC_CMD_SET_ID_LED_OUT_LEN != 0);
1879
1880	MCDI_SET_DWORD(inbuf, SET_ID_LED_IN_STATE, mode);
1881
1882	return efx_mcdi_rpc(efx, MC_CMD_SET_ID_LED, inbuf, sizeof(inbuf), NULL, 0, NULL);
 
1883}
1884
1885static int efx_mcdi_reset_func(struct efx_nic *efx)
1886{
1887	MCDI_DECLARE_BUF(inbuf, MC_CMD_ENTITY_RESET_IN_LEN);
1888	int rc;
1889
1890	BUILD_BUG_ON(MC_CMD_ENTITY_RESET_OUT_LEN != 0);
1891	MCDI_POPULATE_DWORD_1(inbuf, ENTITY_RESET_IN_FLAG,
1892			      ENTITY_RESET_IN_FUNCTION_RESOURCE_RESET, 1);
1893	rc = efx_mcdi_rpc(efx, MC_CMD_ENTITY_RESET, inbuf, sizeof(inbuf),
1894			  NULL, 0, NULL);
1895	return rc;
1896}
1897
1898static int efx_mcdi_reset_mc(struct efx_nic *efx)
1899{
1900	MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
1901	int rc;
1902
1903	BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
1904	MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS, 0);
1905	rc = efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, sizeof(inbuf),
1906			  NULL, 0, NULL);
1907	/* White is black, and up is down */
1908	if (rc == -EIO)
1909		return 0;
1910	if (rc == 0)
1911		rc = -EIO;
1912	return rc;
1913}
1914
1915enum reset_type efx_mcdi_map_reset_reason(enum reset_type reason)
1916{
1917	return RESET_TYPE_RECOVER_OR_ALL;
1918}
1919
1920int efx_mcdi_reset(struct efx_nic *efx, enum reset_type method)
1921{
1922	int rc;
1923
1924	/* If MCDI is down, we can't handle_assertion */
1925	if (method == RESET_TYPE_MCDI_TIMEOUT) {
1926		rc = pci_reset_function(efx->pci_dev);
1927		if (rc)
1928			return rc;
1929		/* Re-enable polled MCDI completion */
1930		if (efx->mcdi) {
1931			struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
1932			mcdi->mode = MCDI_MODE_POLL;
1933		}
1934		return 0;
1935	}
1936
1937	/* Recover from a failed assertion pre-reset */
1938	rc = efx_mcdi_handle_assertion(efx);
1939	if (rc)
1940		return rc;
1941
1942	if (method == RESET_TYPE_DATAPATH)
1943		return 0;
1944	else if (method == RESET_TYPE_WORLD)
1945		return efx_mcdi_reset_mc(efx);
1946	else
1947		return efx_mcdi_reset_func(efx);
1948}
1949
1950static int efx_mcdi_wol_filter_set(struct efx_nic *efx, u32 type,
1951				   const u8 *mac, int *id_out)
1952{
1953	MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_SET_IN_LEN);
1954	MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_SET_OUT_LEN);
1955	size_t outlen;
1956	int rc;
1957
1958	MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_WOL_TYPE, type);
1959	MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_FILTER_MODE,
1960		       MC_CMD_FILTER_MODE_SIMPLE);
1961	ether_addr_copy(MCDI_PTR(inbuf, WOL_FILTER_SET_IN_MAGIC_MAC), mac);
1962
1963	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_SET, inbuf, sizeof(inbuf),
1964			  outbuf, sizeof(outbuf), &outlen);
1965	if (rc)
1966		goto fail;
1967
1968	if (outlen < MC_CMD_WOL_FILTER_SET_OUT_LEN) {
1969		rc = -EIO;
1970		goto fail;
1971	}
1972
1973	*id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_SET_OUT_FILTER_ID);
1974
1975	return 0;
1976
1977fail:
1978	*id_out = -1;
1979	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1980	return rc;
1981
1982}
1983
1984
1985int
1986efx_mcdi_wol_filter_set_magic(struct efx_nic *efx,  const u8 *mac, int *id_out)
1987{
1988	return efx_mcdi_wol_filter_set(efx, MC_CMD_WOL_TYPE_MAGIC, mac, id_out);
1989}
1990
1991
1992int efx_mcdi_wol_filter_get_magic(struct efx_nic *efx, int *id_out)
1993{
1994	MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_GET_OUT_LEN);
1995	size_t outlen;
1996	int rc;
1997
1998	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_GET, NULL, 0,
1999			  outbuf, sizeof(outbuf), &outlen);
2000	if (rc)
2001		goto fail;
2002
2003	if (outlen < MC_CMD_WOL_FILTER_GET_OUT_LEN) {
2004		rc = -EIO;
2005		goto fail;
2006	}
2007
2008	*id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_GET_OUT_FILTER_ID);
2009
2010	return 0;
2011
2012fail:
2013	*id_out = -1;
2014	netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
2015	return rc;
2016}
2017
2018
2019int efx_mcdi_wol_filter_remove(struct efx_nic *efx, int id)
2020{
2021	MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_REMOVE_IN_LEN);
2022	int rc;
2023
2024	MCDI_SET_DWORD(inbuf, WOL_FILTER_REMOVE_IN_FILTER_ID, (u32)id);
2025
2026	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_REMOVE, inbuf, sizeof(inbuf),
2027			  NULL, 0, NULL);
2028	return rc;
2029}
2030
2031int efx_mcdi_flush_rxqs(struct efx_nic *efx)
2032{
2033	struct efx_channel *channel;
2034	struct efx_rx_queue *rx_queue;
2035	MCDI_DECLARE_BUF(inbuf,
2036			 MC_CMD_FLUSH_RX_QUEUES_IN_LEN(EFX_MAX_CHANNELS));
2037	int rc, count;
2038
2039	BUILD_BUG_ON(EFX_MAX_CHANNELS >
2040		     MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);
2041
2042	count = 0;
2043	efx_for_each_channel(channel, efx) {
2044		efx_for_each_channel_rx_queue(rx_queue, channel) {
2045			if (rx_queue->flush_pending) {
2046				rx_queue->flush_pending = false;
2047				atomic_dec(&efx->rxq_flush_pending);
2048				MCDI_SET_ARRAY_DWORD(
2049					inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
2050					count, efx_rx_queue_index(rx_queue));
2051				count++;
2052			}
2053		}
2054	}
2055
2056	rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
2057			  MC_CMD_FLUSH_RX_QUEUES_IN_LEN(count), NULL, 0, NULL);
2058	WARN_ON(rc < 0);
2059
2060	return rc;
2061}
2062
2063int efx_mcdi_wol_filter_reset(struct efx_nic *efx)
2064{
2065	int rc;
2066
2067	rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_RESET, NULL, 0, NULL, 0, NULL);
2068	return rc;
2069}
2070
2071int efx_mcdi_set_workaround(struct efx_nic *efx, u32 type, bool enabled,
2072			    unsigned int *flags)
2073{
2074	MCDI_DECLARE_BUF(inbuf, MC_CMD_WORKAROUND_IN_LEN);
2075	MCDI_DECLARE_BUF(outbuf, MC_CMD_WORKAROUND_EXT_OUT_LEN);
2076	size_t outlen;
2077	int rc;
2078
2079	BUILD_BUG_ON(MC_CMD_WORKAROUND_OUT_LEN != 0);
2080	MCDI_SET_DWORD(inbuf, WORKAROUND_IN_TYPE, type);
2081	MCDI_SET_DWORD(inbuf, WORKAROUND_IN_ENABLED, enabled);
2082	rc = efx_mcdi_rpc(efx, MC_CMD_WORKAROUND, inbuf, sizeof(inbuf),
2083			  outbuf, sizeof(outbuf), &outlen);
2084	if (rc)
2085		return rc;
2086
2087	if (!flags)
2088		return 0;
2089
2090	if (outlen >= MC_CMD_WORKAROUND_EXT_OUT_LEN)
2091		*flags = MCDI_DWORD(outbuf, WORKAROUND_EXT_OUT_FLAGS);
2092	else
2093		*flags = 0;
2094
2095	return 0;
2096}
2097
2098int efx_mcdi_get_workarounds(struct efx_nic *efx, unsigned int *impl_out,
2099			     unsigned int *enabled_out)
2100{
2101	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_WORKAROUNDS_OUT_LEN);
2102	size_t outlen;
2103	int rc;
2104
2105	rc = efx_mcdi_rpc(efx, MC_CMD_GET_WORKAROUNDS, NULL, 0,
2106			  outbuf, sizeof(outbuf), &outlen);
2107	if (rc)
2108		goto fail;
2109
2110	if (outlen < MC_CMD_GET_WORKAROUNDS_OUT_LEN) {
2111		rc = -EIO;
2112		goto fail;
2113	}
2114
2115	if (impl_out)
2116		*impl_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_IMPLEMENTED);
2117
2118	if (enabled_out)
2119		*enabled_out = MCDI_DWORD(outbuf, GET_WORKAROUNDS_OUT_ENABLED);
2120
2121	return 0;
2122
2123fail:
2124	/* Older firmware lacks GET_WORKAROUNDS and this isn't especially
2125	 * terrifying.  The call site will have to deal with it though.
2126	 */
2127	netif_cond_dbg(efx, hw, efx->net_dev, rc == -ENOSYS, err,
2128		       "%s: failed rc=%d\n", __func__, rc);
2129	return rc;
2130}
2131
2132/* Failure to read a privilege mask is never fatal, because we can always
2133 * carry on as though we didn't have the privilege we were interested in.
2134 * So use efx_mcdi_rpc_quiet().
2135 */
2136int efx_mcdi_get_privilege_mask(struct efx_nic *efx, u32 *mask)
2137{
2138	MCDI_DECLARE_BUF(fi_outbuf, MC_CMD_GET_FUNCTION_INFO_OUT_LEN);
2139	MCDI_DECLARE_BUF(pm_inbuf, MC_CMD_PRIVILEGE_MASK_IN_LEN);
2140	MCDI_DECLARE_BUF(pm_outbuf, MC_CMD_PRIVILEGE_MASK_OUT_LEN);
2141	size_t outlen;
2142	u16 pf, vf;
2143	int rc;
2144
2145	if (!efx || !mask)
2146		return -EINVAL;
2147
2148	/* Get our function number */
2149	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_GET_FUNCTION_INFO, NULL, 0,
2150				fi_outbuf, MC_CMD_GET_FUNCTION_INFO_OUT_LEN,
2151				&outlen);
2152	if (rc != 0)
2153		return rc;
2154	if (outlen < MC_CMD_GET_FUNCTION_INFO_OUT_LEN)
2155		return -EIO;
2156
2157	pf = MCDI_DWORD(fi_outbuf, GET_FUNCTION_INFO_OUT_PF);
2158	vf = MCDI_DWORD(fi_outbuf, GET_FUNCTION_INFO_OUT_VF);
2159
2160	MCDI_POPULATE_DWORD_2(pm_inbuf, PRIVILEGE_MASK_IN_FUNCTION,
2161			      PRIVILEGE_MASK_IN_FUNCTION_PF, pf,
2162			      PRIVILEGE_MASK_IN_FUNCTION_VF, vf);
2163
2164	rc = efx_mcdi_rpc_quiet(efx, MC_CMD_PRIVILEGE_MASK,
2165				pm_inbuf, sizeof(pm_inbuf),
2166				pm_outbuf, sizeof(pm_outbuf), &outlen);
2167
2168	if (rc != 0)
2169		return rc;
2170	if (outlen < MC_CMD_PRIVILEGE_MASK_OUT_LEN)
2171		return -EIO;
2172
2173	*mask = MCDI_DWORD(pm_outbuf, PRIVILEGE_MASK_OUT_OLD_MASK);
2174
2175	return 0;
2176}
2177
2178#ifdef CONFIG_SFC_MTD
2179
2180#define EFX_MCDI_NVRAM_LEN_MAX 128
2181
2182static int efx_mcdi_nvram_update_start(struct efx_nic *efx, unsigned int type)
2183{
2184	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_START_V2_IN_LEN);
2185	int rc;
2186
2187	MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_START_IN_TYPE, type);
2188	MCDI_POPULATE_DWORD_1(inbuf, NVRAM_UPDATE_START_V2_IN_FLAGS,
2189			      NVRAM_UPDATE_START_V2_IN_FLAG_REPORT_VERIFY_RESULT,
2190			      1);
2191
2192	BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_START_OUT_LEN != 0);
2193
2194	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_START, inbuf, sizeof(inbuf),
2195			  NULL, 0, NULL);
2196
2197	return rc;
2198}
2199
2200static int efx_mcdi_nvram_read(struct efx_nic *efx, unsigned int type,
2201			       loff_t offset, u8 *buffer, size_t length)
2202{
2203	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_READ_IN_V2_LEN);
2204	MCDI_DECLARE_BUF(outbuf,
2205			 MC_CMD_NVRAM_READ_OUT_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2206	size_t outlen;
2207	int rc;
2208
2209	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_TYPE, type);
2210	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_OFFSET, offset);
2211	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_LENGTH, length);
2212	MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_V2_MODE,
2213		       MC_CMD_NVRAM_READ_IN_V2_DEFAULT);
2214
2215	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_READ, inbuf, sizeof(inbuf),
2216			  outbuf, sizeof(outbuf), &outlen);
2217	if (rc)
2218		return rc;
2219
2220	memcpy(buffer, MCDI_PTR(outbuf, NVRAM_READ_OUT_READ_BUFFER), length);
2221	return 0;
2222}
2223
2224static int efx_mcdi_nvram_write(struct efx_nic *efx, unsigned int type,
2225				loff_t offset, const u8 *buffer, size_t length)
2226{
2227	MCDI_DECLARE_BUF(inbuf,
2228			 MC_CMD_NVRAM_WRITE_IN_LEN(EFX_MCDI_NVRAM_LEN_MAX));
2229	int rc;
2230
2231	MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_TYPE, type);
2232	MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_OFFSET, offset);
2233	MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_LENGTH, length);
2234	memcpy(MCDI_PTR(inbuf, NVRAM_WRITE_IN_WRITE_BUFFER), buffer, length);
2235
2236	BUILD_BUG_ON(MC_CMD_NVRAM_WRITE_OUT_LEN != 0);
2237
2238	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_WRITE, inbuf,
2239			  ALIGN(MC_CMD_NVRAM_WRITE_IN_LEN(length), 4),
2240			  NULL, 0, NULL);
2241	return rc;
2242}
2243
2244static int efx_mcdi_nvram_erase(struct efx_nic *efx, unsigned int type,
2245				loff_t offset, size_t length)
2246{
2247	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_ERASE_IN_LEN);
2248	int rc;
2249
2250	MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_TYPE, type);
2251	MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_OFFSET, offset);
2252	MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_LENGTH, length);
2253
2254	BUILD_BUG_ON(MC_CMD_NVRAM_ERASE_OUT_LEN != 0);
2255
2256	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_ERASE, inbuf, sizeof(inbuf),
2257			  NULL, 0, NULL);
2258	return rc;
2259}
2260
2261static int efx_mcdi_nvram_update_finish(struct efx_nic *efx, unsigned int type)
2262{
2263	MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_FINISH_V2_IN_LEN);
2264	MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_UPDATE_FINISH_V2_OUT_LEN);
2265	size_t outlen;
2266	int rc, rc2;
2267
2268	MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_FINISH_IN_TYPE, type);
2269	/* Always set this flag. Old firmware ignores it */
2270	MCDI_POPULATE_DWORD_1(inbuf, NVRAM_UPDATE_FINISH_V2_IN_FLAGS,
2271			      NVRAM_UPDATE_FINISH_V2_IN_FLAG_REPORT_VERIFY_RESULT,
2272			      1);
2273
2274	rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_FINISH, inbuf, sizeof(inbuf),
2275			  outbuf, sizeof(outbuf), &outlen);
2276	if (!rc && outlen >= MC_CMD_NVRAM_UPDATE_FINISH_V2_OUT_LEN) {
2277		rc2 = MCDI_DWORD(outbuf, NVRAM_UPDATE_FINISH_V2_OUT_RESULT_CODE);
2278		if (rc2 != MC_CMD_NVRAM_VERIFY_RC_SUCCESS)
2279			netif_err(efx, drv, efx->net_dev,
2280				  "NVRAM update failed verification with code 0x%x\n",
2281				  rc2);
2282		switch (rc2) {
2283		case MC_CMD_NVRAM_VERIFY_RC_SUCCESS:
2284			break;
2285		case MC_CMD_NVRAM_VERIFY_RC_CMS_CHECK_FAILED:
2286		case MC_CMD_NVRAM_VERIFY_RC_MESSAGE_DIGEST_CHECK_FAILED:
2287		case MC_CMD_NVRAM_VERIFY_RC_SIGNATURE_CHECK_FAILED:
2288		case MC_CMD_NVRAM_VERIFY_RC_TRUSTED_APPROVERS_CHECK_FAILED:
2289		case MC_CMD_NVRAM_VERIFY_RC_SIGNATURE_CHAIN_CHECK_FAILED:
2290			rc = -EIO;
2291			break;
2292		case MC_CMD_NVRAM_VERIFY_RC_INVALID_CMS_FORMAT:
2293		case MC_CMD_NVRAM_VERIFY_RC_BAD_MESSAGE_DIGEST:
2294			rc = -EINVAL;
2295			break;
2296		case MC_CMD_NVRAM_VERIFY_RC_NO_VALID_SIGNATURES:
2297		case MC_CMD_NVRAM_VERIFY_RC_NO_TRUSTED_APPROVERS:
2298		case MC_CMD_NVRAM_VERIFY_RC_NO_SIGNATURE_MATCH:
2299			rc = -EPERM;
2300			break;
2301		default:
2302			netif_err(efx, drv, efx->net_dev,
2303				  "Unknown response to NVRAM_UPDATE_FINISH\n");
2304			rc = -EIO;
2305		}
2306	}
2307
 
 
2308	return rc;
2309}
2310
2311int efx_mcdi_mtd_read(struct mtd_info *mtd, loff_t start,
2312		      size_t len, size_t *retlen, u8 *buffer)
2313{
2314	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2315	struct efx_nic *efx = mtd->priv;
2316	loff_t offset = start;
2317	loff_t end = min_t(loff_t, start + len, mtd->size);
2318	size_t chunk;
2319	int rc = 0;
2320
2321	while (offset < end) {
2322		chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2323		rc = efx_mcdi_nvram_read(efx, part->nvram_type, offset,
2324					 buffer, chunk);
2325		if (rc)
2326			goto out;
2327		offset += chunk;
2328		buffer += chunk;
2329	}
2330out:
2331	*retlen = offset - start;
2332	return rc;
2333}
2334
2335int efx_mcdi_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
2336{
2337	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2338	struct efx_nic *efx = mtd->priv;
2339	loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
2340	loff_t end = min_t(loff_t, start + len, mtd->size);
2341	size_t chunk = part->common.mtd.erasesize;
2342	int rc = 0;
2343
2344	if (!part->updating) {
2345		rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2346		if (rc)
2347			goto out;
2348		part->updating = true;
2349	}
2350
2351	/* The MCDI interface can in fact do multiple erase blocks at once;
2352	 * but erasing may be slow, so we make multiple calls here to avoid
2353	 * tripping the MCDI RPC timeout. */
2354	while (offset < end) {
2355		rc = efx_mcdi_nvram_erase(efx, part->nvram_type, offset,
2356					  chunk);
2357		if (rc)
2358			goto out;
2359		offset += chunk;
2360	}
2361out:
2362	return rc;
2363}
2364
2365int efx_mcdi_mtd_write(struct mtd_info *mtd, loff_t start,
2366		       size_t len, size_t *retlen, const u8 *buffer)
2367{
2368	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2369	struct efx_nic *efx = mtd->priv;
2370	loff_t offset = start;
2371	loff_t end = min_t(loff_t, start + len, mtd->size);
2372	size_t chunk;
2373	int rc = 0;
2374
2375	if (!part->updating) {
2376		rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
2377		if (rc)
2378			goto out;
2379		part->updating = true;
2380	}
2381
2382	while (offset < end) {
2383		chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
2384		rc = efx_mcdi_nvram_write(efx, part->nvram_type, offset,
2385					  buffer, chunk);
2386		if (rc)
2387			goto out;
2388		offset += chunk;
2389		buffer += chunk;
2390	}
2391out:
2392	*retlen = offset - start;
2393	return rc;
2394}
2395
2396int efx_mcdi_mtd_sync(struct mtd_info *mtd)
2397{
2398	struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
2399	struct efx_nic *efx = mtd->priv;
2400	int rc = 0;
2401
2402	if (part->updating) {
2403		part->updating = false;
2404		rc = efx_mcdi_nvram_update_finish(efx, part->nvram_type);
2405	}
2406
2407	return rc;
2408}
2409
2410void efx_mcdi_mtd_rename(struct efx_mtd_partition *part)
2411{
2412	struct efx_mcdi_mtd_partition *mcdi_part =
2413		container_of(part, struct efx_mcdi_mtd_partition, common);
2414	struct efx_nic *efx = part->mtd.priv;
2415
2416	snprintf(part->name, sizeof(part->name), "%s %s:%02x",
2417		 efx->name, part->type_name, mcdi_part->fw_subtype);
2418}
2419
2420#endif /* CONFIG_SFC_MTD */