/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2008-2013 Solarflare Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation, incorporated herein by reference.
 */

#include <linux/delay.h>
#include <asm/cmpxchg.h>
#include "net_driver.h"
#include "nic.h"
#include "io.h"
#include "farch_regs.h"
#include "mcdi_pcol.h"
#include "phy.h"

/**************************************************************************
 *
 * Management-Controller-to-Driver Interface
 *
 **************************************************************************
 */

#define MCDI_RPC_TIMEOUT       (10 * HZ)

/* A reboot/assertion causes the MCDI status word to be set after the
 * command word is set or a REBOOT event is sent. If we notice a reboot
 * via these mechanisms then wait 250ms for the status word to be set.
 */
#define MCDI_STATUS_DELAY_US            100
#define MCDI_STATUS_DELAY_COUNT         2500
#define MCDI_STATUS_SLEEP_MS                                            \
        (MCDI_STATUS_DELAY_US * MCDI_STATUS_DELAY_COUNT / 1000)

#define SEQ_MASK                                                        \
        EFX_MASK32(EFX_WIDTH(MCDI_HEADER_SEQ))

struct efx_mcdi_async_param {
        struct list_head list;
        unsigned int cmd;
        size_t inlen;
        size_t outlen;
        efx_mcdi_async_completer *complete;
        unsigned long cookie;
        /* followed by request/response buffer */
};

static void efx_mcdi_timeout_async(unsigned long context);
static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
                               bool *was_attached_out);
static bool efx_mcdi_poll_once(struct efx_nic *efx);

static inline struct efx_mcdi_iface *efx_mcdi(struct efx_nic *efx)
{
        EFX_BUG_ON_PARANOID(!efx->mcdi);
        return &efx->mcdi->iface;
}

int efx_mcdi_init(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi;
        bool already_attached;
        int rc;

        efx->mcdi = kzalloc(sizeof(*efx->mcdi), GFP_KERNEL);
        if (!efx->mcdi)
                return -ENOMEM;

        mcdi = efx_mcdi(efx);
        mcdi->efx = efx;
        init_waitqueue_head(&mcdi->wq);
        spin_lock_init(&mcdi->iface_lock);
        mcdi->state = MCDI_STATE_QUIESCENT;
        mcdi->mode = MCDI_MODE_POLL;
        spin_lock_init(&mcdi->async_lock);
        INIT_LIST_HEAD(&mcdi->async_list);
        setup_timer(&mcdi->async_timer, efx_mcdi_timeout_async,
                    (unsigned long)mcdi);

        (void) efx_mcdi_poll_reboot(efx);
        mcdi->new_epoch = true;

        /* Recover from a failed assertion before probing */
        rc = efx_mcdi_handle_assertion(efx);
        if (rc)
                return rc;

        /* Let the MC (and BMC, if this is a LOM) know that the driver
         * is loaded. We should do this before we reset the NIC.
         */
        rc = efx_mcdi_drv_attach(efx, true, &already_attached);
        if (rc) {
                netif_err(efx, probe, efx->net_dev,
                          "Unable to register driver with MCPU\n");
                return rc;
        }
        if (already_attached)
                /* Not a fatal error */
                netif_err(efx, probe, efx->net_dev,
                          "Host already registered with MCPU\n");

        return 0;
}

void efx_mcdi_fini(struct efx_nic *efx)
{
        if (!efx->mcdi)
                return;

        BUG_ON(efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);

        /* Relinquish the device (back to the BMC, if this is a LOM) */
        efx_mcdi_drv_attach(efx, false, NULL);

        kfree(efx->mcdi);
}

static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
                                  const efx_dword_t *inbuf, size_t inlen)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        efx_dword_t hdr[2];
        size_t hdr_len;
        u32 xflags, seqno;

        BUG_ON(mcdi->state == MCDI_STATE_QUIESCENT);

        /* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
        spin_lock_bh(&mcdi->iface_lock);
        ++mcdi->seqno;
        spin_unlock_bh(&mcdi->iface_lock);

        seqno = mcdi->seqno & SEQ_MASK;
        xflags = 0;
        if (mcdi->mode == MCDI_MODE_EVENTS)
                xflags |= MCDI_HEADER_XFLAGS_EVREQ;

        if (efx->type->mcdi_max_ver == 1) {
                /* MCDI v1 */
                EFX_POPULATE_DWORD_7(hdr[0],
                                     MCDI_HEADER_RESPONSE, 0,
                                     MCDI_HEADER_RESYNC, 1,
                                     MCDI_HEADER_CODE, cmd,
                                     MCDI_HEADER_DATALEN, inlen,
                                     MCDI_HEADER_SEQ, seqno,
                                     MCDI_HEADER_XFLAGS, xflags,
                                     MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
                hdr_len = 4;
        } else {
                /* MCDI v2 */
                BUG_ON(inlen > MCDI_CTL_SDU_LEN_MAX_V2);
                EFX_POPULATE_DWORD_7(hdr[0],
                                     MCDI_HEADER_RESPONSE, 0,
                                     MCDI_HEADER_RESYNC, 1,
                                     MCDI_HEADER_CODE, MC_CMD_V2_EXTN,
                                     MCDI_HEADER_DATALEN, 0,
                                     MCDI_HEADER_SEQ, seqno,
                                     MCDI_HEADER_XFLAGS, xflags,
                                     MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
                EFX_POPULATE_DWORD_2(hdr[1],
                                     MC_CMD_V2_EXTN_IN_EXTENDED_CMD, cmd,
                                     MC_CMD_V2_EXTN_IN_ACTUAL_LEN, inlen);
                hdr_len = 8;
        }

        efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);

        mcdi->new_epoch = false;
}

static int efx_mcdi_errno(unsigned int mcdi_err)
{
        switch (mcdi_err) {
        case 0:
                return 0;
#define TRANSLATE_ERROR(name)                                   \
        case MC_CMD_ERR_ ## name:                               \
                return -name;
        TRANSLATE_ERROR(EPERM);
        TRANSLATE_ERROR(ENOENT);
        TRANSLATE_ERROR(EINTR);
        TRANSLATE_ERROR(EAGAIN);
        TRANSLATE_ERROR(EACCES);
        TRANSLATE_ERROR(EBUSY);
        TRANSLATE_ERROR(EINVAL);
        TRANSLATE_ERROR(EDEADLK);
        TRANSLATE_ERROR(ENOSYS);
        TRANSLATE_ERROR(ETIME);
        TRANSLATE_ERROR(EALREADY);
        TRANSLATE_ERROR(ENOSPC);
#undef TRANSLATE_ERROR
        case MC_CMD_ERR_ALLOC_FAIL:
                return -ENOBUFS;
        case MC_CMD_ERR_MAC_EXIST:
                return -EADDRINUSE;
        default:
                return -EPROTO;
        }
}

static void efx_mcdi_read_response_header(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        unsigned int respseq, respcmd, error;
        efx_dword_t hdr;

        efx->type->mcdi_read_response(efx, &hdr, 0, 4);
        respseq = EFX_DWORD_FIELD(hdr, MCDI_HEADER_SEQ);
        respcmd = EFX_DWORD_FIELD(hdr, MCDI_HEADER_CODE);
        error = EFX_DWORD_FIELD(hdr, MCDI_HEADER_ERROR);

        if (respcmd != MC_CMD_V2_EXTN) {
                mcdi->resp_hdr_len = 4;
                mcdi->resp_data_len = EFX_DWORD_FIELD(hdr, MCDI_HEADER_DATALEN);
        } else {
                efx->type->mcdi_read_response(efx, &hdr, 4, 4);
                mcdi->resp_hdr_len = 8;
                mcdi->resp_data_len =
                        EFX_DWORD_FIELD(hdr, MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
        }

        if (error && mcdi->resp_data_len == 0) {
                netif_err(efx, hw, efx->net_dev, "MC rebooted\n");
                mcdi->resprc = -EIO;
        } else if ((respseq ^ mcdi->seqno) & SEQ_MASK) {
                netif_err(efx, hw, efx->net_dev,
                          "MC response mismatch tx seq 0x%x rx seq 0x%x\n",
                          respseq, mcdi->seqno);
                mcdi->resprc = -EIO;
        } else if (error) {
                efx->type->mcdi_read_response(efx, &hdr, mcdi->resp_hdr_len, 4);
                mcdi->resprc =
                        efx_mcdi_errno(EFX_DWORD_FIELD(hdr, EFX_DWORD_0));
        } else {
                mcdi->resprc = 0;
        }
}

static bool efx_mcdi_poll_once(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);

        rmb();
        if (!efx->type->mcdi_poll_response(efx))
                return false;

        spin_lock_bh(&mcdi->iface_lock);
        efx_mcdi_read_response_header(efx);
        spin_unlock_bh(&mcdi->iface_lock);

        return true;
}

static int efx_mcdi_poll(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        unsigned long time, finish;
        unsigned int spins;
        int rc;

        /* Check for a reboot atomically with respect to efx_mcdi_copyout() */
        rc = efx_mcdi_poll_reboot(efx);
        if (rc) {
                spin_lock_bh(&mcdi->iface_lock);
                mcdi->resprc = rc;
                mcdi->resp_hdr_len = 0;
                mcdi->resp_data_len = 0;
                spin_unlock_bh(&mcdi->iface_lock);
                return 0;
        }

        /* Poll for completion. Poll quickly (once a us) for the 1st jiffy,
         * because generally mcdi responses are fast. After that, back off
         * and poll once a jiffy (approximately)
         */
        spins = TICK_USEC;
        finish = jiffies + MCDI_RPC_TIMEOUT;

        while (1) {
                if (spins != 0) {
                        --spins;
                        udelay(1);
                } else {
                        schedule_timeout_uninterruptible(1);
                }

                time = jiffies;

                if (efx_mcdi_poll_once(efx))
                        break;

                if (time_after(time, finish))
                        return -ETIMEDOUT;
        }

        /* Return rc=0 like wait_event_timeout() */
        return 0;
}

/* Test and clear MC-rebooted flag for this port/function; reset
 * software state as necessary.
 */
int efx_mcdi_poll_reboot(struct efx_nic *efx)
{
        if (!efx->mcdi)
                return 0;

        return efx->type->mcdi_poll_reboot(efx);
}

static bool efx_mcdi_acquire_async(struct efx_mcdi_iface *mcdi)
{
        return cmpxchg(&mcdi->state,
                       MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_ASYNC) ==
                MCDI_STATE_QUIESCENT;
}

static void efx_mcdi_acquire_sync(struct efx_mcdi_iface *mcdi)
{
        /* Wait until the interface becomes QUIESCENT and we win the race
         * to mark it RUNNING_SYNC.
         */
        wait_event(mcdi->wq,
                   cmpxchg(&mcdi->state,
                           MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_SYNC) ==
                   MCDI_STATE_QUIESCENT);
}

static int efx_mcdi_await_completion(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);

        if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
                               MCDI_RPC_TIMEOUT) == 0)
                return -ETIMEDOUT;

        /* Check if efx_mcdi_set_mode() switched us back to polled completions.
         * In which case, poll for completions directly. If efx_mcdi_ev_cpl()
         * completed the request first, then we'll just end up completing the
         * request again, which is safe.
         *
         * We need an smp_rmb() to synchronise with efx_mcdi_mode_poll(), which
         * wait_event_timeout() implicitly provides.
         */
        if (mcdi->mode == MCDI_MODE_POLL)
                return efx_mcdi_poll(efx);

        return 0;
}

/* If the interface is RUNNING_SYNC, switch to COMPLETED and wake the
 * requester.  Return whether this was done.  Does not take any locks.
 */
static bool efx_mcdi_complete_sync(struct efx_mcdi_iface *mcdi)
{
        if (cmpxchg(&mcdi->state,
                    MCDI_STATE_RUNNING_SYNC, MCDI_STATE_COMPLETED) ==
            MCDI_STATE_RUNNING_SYNC) {
                wake_up(&mcdi->wq);
                return true;
        }

        return false;
}

static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
{
        if (mcdi->mode == MCDI_MODE_EVENTS) {
                struct efx_mcdi_async_param *async;
                struct efx_nic *efx = mcdi->efx;

                /* Process the asynchronous request queue */
                spin_lock_bh(&mcdi->async_lock);
                async = list_first_entry_or_null(
                        &mcdi->async_list, struct efx_mcdi_async_param, list);
                if (async) {
                        mcdi->state = MCDI_STATE_RUNNING_ASYNC;
                        efx_mcdi_send_request(efx, async->cmd,
                                              (const efx_dword_t *)(async + 1),
                                              async->inlen);
                        mod_timer(&mcdi->async_timer,
                                  jiffies + MCDI_RPC_TIMEOUT);
                }
                spin_unlock_bh(&mcdi->async_lock);

                if (async)
                        return;
        }

        mcdi->state = MCDI_STATE_QUIESCENT;
        wake_up(&mcdi->wq);
}

/* If the interface is RUNNING_ASYNC, switch to COMPLETED, call the
 * asynchronous completion function, and release the interface.
 * Return whether this was done.  Must be called in bh-disabled
 * context.  Will take iface_lock and async_lock.
 */
static bool efx_mcdi_complete_async(struct efx_mcdi_iface *mcdi, bool timeout)
{
        struct efx_nic *efx = mcdi->efx;
        struct efx_mcdi_async_param *async;
        size_t hdr_len, data_len;
        efx_dword_t *outbuf;
        int rc;

        if (cmpxchg(&mcdi->state,
                    MCDI_STATE_RUNNING_ASYNC, MCDI_STATE_COMPLETED) !=
            MCDI_STATE_RUNNING_ASYNC)
                return false;

        spin_lock(&mcdi->iface_lock);
        if (timeout) {
                /* Ensure that if the completion event arrives later,
                 * the seqno check in efx_mcdi_ev_cpl() will fail
                 */
                ++mcdi->seqno;
                ++mcdi->credits;
                rc = -ETIMEDOUT;
                hdr_len = 0;
                data_len = 0;
        } else {
                rc = mcdi->resprc;
                hdr_len = mcdi->resp_hdr_len;
                data_len = mcdi->resp_data_len;
        }
        spin_unlock(&mcdi->iface_lock);

        /* Stop the timer.  In case the timer function is running, we
         * must wait for it to return so that there is no possibility
         * of it aborting the next request.
         */
        if (!timeout)
                del_timer_sync(&mcdi->async_timer);

        spin_lock(&mcdi->async_lock);
        async = list_first_entry(&mcdi->async_list,
                                 struct efx_mcdi_async_param, list);
        list_del(&async->list);
        spin_unlock(&mcdi->async_lock);

        outbuf = (efx_dword_t *)(async + 1);
        efx->type->mcdi_read_response(efx, outbuf, hdr_len,
                                      min(async->outlen, data_len));
        async->complete(efx, async->cookie, rc, outbuf, data_len);
        kfree(async);

        efx_mcdi_release(mcdi);

        return true;
}

static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
                            unsigned int datalen, unsigned int mcdi_err)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        bool wake = false;

        spin_lock(&mcdi->iface_lock);

        if ((seqno ^ mcdi->seqno) & SEQ_MASK) {
                if (mcdi->credits)
                        /* The request has been cancelled */
                        --mcdi->credits;
                else
                        netif_err(efx, hw, efx->net_dev,
                                  "MC response mismatch tx seq 0x%x rx "
                                  "seq 0x%x\n", seqno, mcdi->seqno);
        } else {
                if (efx->type->mcdi_max_ver >= 2) {
                        /* MCDI v2 responses don't fit in an event */
                        efx_mcdi_read_response_header(efx);
                } else {
                        mcdi->resprc = efx_mcdi_errno(mcdi_err);
                        mcdi->resp_hdr_len = 4;
                        mcdi->resp_data_len = datalen;
                }

                wake = true;
        }

        spin_unlock(&mcdi->iface_lock);

        if (wake) {
                if (!efx_mcdi_complete_async(mcdi, false))
                        (void) efx_mcdi_complete_sync(mcdi);

                /* If the interface isn't RUNNING_ASYNC or
                 * RUNNING_SYNC then we've received a duplicate
                 * completion after we've already transitioned back to
                 * QUIESCENT. [A subsequent invocation would increment
                 * seqno, so would have failed the seqno check].
                 */
        }
}

static void efx_mcdi_timeout_async(unsigned long context)
{
        struct efx_mcdi_iface *mcdi = (struct efx_mcdi_iface *)context;

        efx_mcdi_complete_async(mcdi, true);
}

static int
efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
{
        if (efx->type->mcdi_max_ver < 0 ||
             (efx->type->mcdi_max_ver < 2 &&
              cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
                return -EINVAL;

        if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
            (efx->type->mcdi_max_ver < 2 &&
             inlen > MCDI_CTL_SDU_LEN_MAX_V1))
                return -EMSGSIZE;

        return 0;
}

int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
                 const efx_dword_t *inbuf, size_t inlen,
                 efx_dword_t *outbuf, size_t outlen,
                 size_t *outlen_actual)
{
        int rc;

        rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen);
        if (rc)
                return rc;
        return efx_mcdi_rpc_finish(efx, cmd, inlen,
                                   outbuf, outlen, outlen_actual);
}

int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
                       const efx_dword_t *inbuf, size_t inlen)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        int rc;

        rc = efx_mcdi_check_supported(efx, cmd, inlen);
        if (rc)
                return rc;

        efx_mcdi_acquire_sync(mcdi);
        efx_mcdi_send_request(efx, cmd, inbuf, inlen);
        return 0;
}

/**
 * efx_mcdi_rpc_async - Schedule an MCDI command to run asynchronously
 * @efx: NIC through which to issue the command
 * @cmd: Command type number
 * @inbuf: Command parameters
 * @inlen: Length of command parameters, in bytes
 * @outlen: Length to allocate for response buffer, in bytes
 * @complete: Function to be called on completion or cancellation.
 * @cookie: Arbitrary value to be passed to @complete.
 *
 * This function does not sleep and therefore may be called in atomic
 * context.  It will fail if event queues are disabled or if MCDI
 * event completions have been disabled due to an error.
 *
 * If it succeeds, the @complete function will be called exactly once
 * in atomic context, when one of the following occurs:
 * (a) the completion event is received (in NAPI context)
 * (b) event queues are disabled (in the process that disables them)
 * (c) the request times-out (in timer context)
 */
int
efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
                   const efx_dword_t *inbuf, size_t inlen, size_t outlen,
                   efx_mcdi_async_completer *complete, unsigned long cookie)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        struct efx_mcdi_async_param *async;
        int rc;

        rc = efx_mcdi_check_supported(efx, cmd, inlen);
        if (rc)
                return rc;

        async = kmalloc(sizeof(*async) + ALIGN(max(inlen, outlen), 4),
                        GFP_ATOMIC);
        if (!async)
                return -ENOMEM;

        async->cmd = cmd;
        async->inlen = inlen;
        async->outlen = outlen;
        async->complete = complete;
        async->cookie = cookie;
        memcpy(async + 1, inbuf, inlen);

        spin_lock_bh(&mcdi->async_lock);

        if (mcdi->mode == MCDI_MODE_EVENTS) {
                list_add_tail(&async->list, &mcdi->async_list);

                /* If this is at the front of the queue, try to start it
                 * immediately
                 */
                if (mcdi->async_list.next == &async->list &&
                    efx_mcdi_acquire_async(mcdi)) {
                        efx_mcdi_send_request(efx, cmd, inbuf, inlen);
                        mod_timer(&mcdi->async_timer,
                                  jiffies + MCDI_RPC_TIMEOUT);
                }
        } else {
                kfree(async);
                rc = -ENETDOWN;
        }

        spin_unlock_bh(&mcdi->async_lock);

        return rc;
}

int efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned cmd, size_t inlen,
                        efx_dword_t *outbuf, size_t outlen,
                        size_t *outlen_actual)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
        int rc;

        if (mcdi->mode == MCDI_MODE_POLL)
                rc = efx_mcdi_poll(efx);
        else
                rc = efx_mcdi_await_completion(efx);

        if (rc != 0) {
                netif_err(efx, hw, efx->net_dev,
                          "MC command 0x%x inlen %d mode %d timed out\n",
                          cmd, (int)inlen, mcdi->mode);

                if (mcdi->mode == MCDI_MODE_EVENTS && efx_mcdi_poll_once(efx)) {
                        netif_err(efx, hw, efx->net_dev,
                                  "MCDI request was completed without an event\n");
                        rc = 0;
                }

                /* Close the race with efx_mcdi_ev_cpl() executing just too late
                 * and completing a request we've just cancelled, by ensuring
                 * that the seqno check therein fails.
                 */
                spin_lock_bh(&mcdi->iface_lock);
                ++mcdi->seqno;
                ++mcdi->credits;
                spin_unlock_bh(&mcdi->iface_lock);
        }

        if (rc == 0) {
                size_t hdr_len, data_len;

                /* At the very least we need a memory barrier here to ensure
                 * we pick up changes from efx_mcdi_ev_cpl(). Protect against
                 * a spurious efx_mcdi_ev_cpl() running concurrently by
                 * acquiring the iface_lock. */
                spin_lock_bh(&mcdi->iface_lock);
                rc = mcdi->resprc;
                hdr_len = mcdi->resp_hdr_len;
                data_len = mcdi->resp_data_len;
                spin_unlock_bh(&mcdi->iface_lock);

                BUG_ON(rc > 0);

                if (rc == 0) {
                        efx->type->mcdi_read_response(efx, outbuf, hdr_len,
                                                      min(outlen, data_len));
                        if (outlen_actual != NULL)
                                *outlen_actual = data_len;
                } else if (cmd == MC_CMD_REBOOT && rc == -EIO)
                        ; /* Don't reset if MC_CMD_REBOOT returns EIO */
                else if (rc == -EIO || rc == -EINTR) {
                        netif_err(efx, hw, efx->net_dev, "MC fatal error %d\n",
                                  -rc);
                        efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
                } else
                        netif_dbg(efx, hw, efx->net_dev,
                                  "MC command 0x%x inlen %d failed rc=%d\n",
                                  cmd, (int)inlen, -rc);

                if (rc == -EIO || rc == -EINTR) {
                        msleep(MCDI_STATUS_SLEEP_MS);
                        efx_mcdi_poll_reboot(efx);
                        mcdi->new_epoch = true;
                }
        }

        efx_mcdi_release(mcdi);
        return rc;
}

/* Switch to polled MCDI completions.  This can be called in various
 * error conditions with various locks held, so it must be lockless.
 * Caller is responsible for flushing asynchronous requests later.
 */
void efx_mcdi_mode_poll(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi;

        if (!efx->mcdi)
                return;

        mcdi = efx_mcdi(efx);
        if (mcdi->mode == MCDI_MODE_POLL)
                return;

        /* We can switch from event completion to polled completion, because
         * mcdi requests are always completed in shared memory. We do this by
         * switching the mode to POLL'd then completing the request.
         * efx_mcdi_await_completion() will then call efx_mcdi_poll().
         *
         * We need an smp_wmb() to synchronise with efx_mcdi_await_completion(),
         * which efx_mcdi_complete_sync() provides for us.
         */
        mcdi->mode = MCDI_MODE_POLL;

        efx_mcdi_complete_sync(mcdi);
}

/* Flush any running or queued asynchronous requests, after event processing
 * is stopped
 */
void efx_mcdi_flush_async(struct efx_nic *efx)
{
        struct efx_mcdi_async_param *async, *next;
        struct efx_mcdi_iface *mcdi;

        if (!efx->mcdi)
                return;

        mcdi = efx_mcdi(efx);

        /* We must be in polling mode so no more requests can be queued */
        BUG_ON(mcdi->mode != MCDI_MODE_POLL);

        del_timer_sync(&mcdi->async_timer);

        /* If a request is still running, make sure we give the MC
         * time to complete it so that the response won't overwrite our
         * next request.
         */
        if (mcdi->state == MCDI_STATE_RUNNING_ASYNC) {
                efx_mcdi_poll(efx);
                mcdi->state = MCDI_STATE_QUIESCENT;
        }

        /* Nothing else will access the async list now, so it is safe
         * to walk it without holding async_lock.  If we hold it while
         * calling a completer then lockdep may warn that we have
         * acquired locks in the wrong order.
         */
        list_for_each_entry_safe(async, next, &mcdi->async_list, list) {
                async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
                list_del(&async->list);
                kfree(async);
        }
}

void efx_mcdi_mode_event(struct efx_nic *efx)
{
        struct efx_mcdi_iface *mcdi;

        if (!efx->mcdi)
                return;

        mcdi = efx_mcdi(efx);

        if (mcdi->mode == MCDI_MODE_EVENTS)
                return;

        /* We can't switch from polled to event completion in the middle of a
         * request, because the completion method is specified in the request.
         * So acquire the interface to serialise the requestors. We don't need
         * to acquire the iface_lock to change the mode here, but we do need a
         * write memory barrier ensure that efx_mcdi_rpc() sees it, which
         * efx_mcdi_acquire() provides.
         */
        efx_mcdi_acquire_sync(mcdi);
        mcdi->mode = MCDI_MODE_EVENTS;
        efx_mcdi_release(mcdi);
}

static void efx_mcdi_ev_death(struct efx_nic *efx, int rc)
{
        struct efx_mcdi_iface *mcdi = efx_mcdi(efx);

        /* If there is an outstanding MCDI request, it has been terminated
         * either by a BADASSERT or REBOOT event. If the mcdi interface is
         * in polled mode, then do nothing because the MC reboot handler will
         * set the header correctly. However, if the mcdi interface is waiting
         * for a CMDDONE event it won't receive it [and since all MCDI events
         * are sent to the same queue, we can't be racing with
         * efx_mcdi_ev_cpl()]
         *
         * If there is an outstanding asynchronous request, we can't
         * complete it now (efx_mcdi_complete() would deadlock).  The
         * reset process will take care of this.
         *
         * There's a race here with efx_mcdi_send_request(), because
         * we might receive a REBOOT event *before* the request has
         * been copied out. In polled mode (during startup) this is
         * irrelevant, because efx_mcdi_complete_sync() is ignored. In
         * event mode, this condition is just an edge-case of
         * receiving a REBOOT event after posting the MCDI
         * request. Did the mc reboot before or after the copyout? The
         * best we can do always is just return failure.
         */
        spin_lock(&mcdi->iface_lock);
        if (efx_mcdi_complete_sync(mcdi)) {
                if (mcdi->mode == MCDI_MODE_EVENTS) {
                        mcdi->resprc = rc;
                        mcdi->resp_hdr_len = 0;
                        mcdi->resp_data_len = 0;
                        ++mcdi->credits;
                }
        } else {
                int count;

                /* Consume the status word since efx_mcdi_rpc_finish() won't */
                for (count = 0; count < MCDI_STATUS_DELAY_COUNT; ++count) {
                        if (efx_mcdi_poll_reboot(efx))
                                break;
                        udelay(MCDI_STATUS_DELAY_US);
                }
                mcdi->new_epoch = true;

                /* Nobody was waiting for an MCDI request, so trigger a reset */
                efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
        }

        spin_unlock(&mcdi->iface_lock);
}

/* Called from  falcon_process_eventq for MCDI events */
void efx_mcdi_process_event(struct efx_channel *channel,
                            efx_qword_t *event)
{
        struct efx_nic *efx = channel->efx;
        int code = EFX_QWORD_FIELD(*event, MCDI_EVENT_CODE);
        u32 data = EFX_QWORD_FIELD(*event, MCDI_EVENT_DATA);

        switch (code) {
        case MCDI_EVENT_CODE_BADSSERT:
                netif_err(efx, hw, efx->net_dev,
                          "MC watchdog or assertion failure at 0x%x\n", data);
                efx_mcdi_ev_death(efx, -EINTR);
                break;

        case MCDI_EVENT_CODE_PMNOTICE:
                netif_info(efx, wol, efx->net_dev, "MCDI PM event.\n");
                break;

        case MCDI_EVENT_CODE_CMDDONE:
                efx_mcdi_ev_cpl(efx,
                                MCDI_EVENT_FIELD(*event, CMDDONE_SEQ),
                                MCDI_EVENT_FIELD(*event, CMDDONE_DATALEN),
                                MCDI_EVENT_FIELD(*event, CMDDONE_ERRNO));
                break;

        case MCDI_EVENT_CODE_LINKCHANGE:
                efx_mcdi_process_link_change(efx, event);
                break;
        case MCDI_EVENT_CODE_SENSOREVT:
                efx_mcdi_sensor_event(efx, event);
                break;
        case MCDI_EVENT_CODE_SCHEDERR:
                netif_info(efx, hw, efx->net_dev,
                           "MC Scheduler error address=0x%x\n", data);
                break;
        case MCDI_EVENT_CODE_REBOOT:
        case MCDI_EVENT_CODE_MC_REBOOT:
                netif_info(efx, hw, efx->net_dev, "MC Reboot\n");
                efx_mcdi_ev_death(efx, -EIO);
                break;
        case MCDI_EVENT_CODE_MAC_STATS_DMA:
                /* MAC stats are gather lazily.  We can ignore this. */
                break;
        case MCDI_EVENT_CODE_FLR:
                efx_sriov_flr(efx, MCDI_EVENT_FIELD(*event, FLR_VF));
                break;
        case MCDI_EVENT_CODE_PTP_RX:
        case MCDI_EVENT_CODE_PTP_FAULT:
        case MCDI_EVENT_CODE_PTP_PPS:
                efx_ptp_event(efx, event);
                break;
        case MCDI_EVENT_CODE_TX_FLUSH:
        case MCDI_EVENT_CODE_RX_FLUSH:
                /* Two flush events will be sent: one to the same event
                 * queue as completions, and one to event queue 0.
                 * In the latter case the {RX,TX}_FLUSH_TO_DRIVER
                 * flag will be set, and we should ignore the event
                 * because we want to wait for all completions.
                 */
                BUILD_BUG_ON(MCDI_EVENT_TX_FLUSH_TO_DRIVER_LBN !=
                             MCDI_EVENT_RX_FLUSH_TO_DRIVER_LBN);
                if (!MCDI_EVENT_FIELD(*event, TX_FLUSH_TO_DRIVER))
                        efx_ef10_handle_drain_event(efx);
                break;
        case MCDI_EVENT_CODE_TX_ERR:
        case MCDI_EVENT_CODE_RX_ERR:
                netif_err(efx, hw, efx->net_dev,
                          "%s DMA error (event: "EFX_QWORD_FMT")\n",
                          code == MCDI_EVENT_CODE_TX_ERR ? "TX" : "RX",
                          EFX_QWORD_VAL(*event));
                efx_schedule_reset(efx, RESET_TYPE_DMA_ERROR);
                break;
        default:
                netif_err(efx, hw, efx->net_dev, "Unknown MCDI event 0x%x\n",
                          code);
        }
}

/**************************************************************************
 *
 * Specific request functions
 *
 **************************************************************************
 */

void efx_mcdi_print_fwver(struct efx_nic *efx, char *buf, size_t len)
{
        MCDI_DECLARE_BUF(outbuf,
                         max(MC_CMD_GET_VERSION_OUT_LEN,
                             MC_CMD_GET_CAPABILITIES_OUT_LEN));
        size_t outlength;
        const __le16 *ver_words;
        size_t offset;
        int rc;

        BUILD_BUG_ON(MC_CMD_GET_VERSION_IN_LEN != 0);
        rc = efx_mcdi_rpc(efx, MC_CMD_GET_VERSION, NULL, 0,
                          outbuf, sizeof(outbuf), &outlength);
        if (rc)
                goto fail;
        if (outlength < MC_CMD_GET_VERSION_OUT_LEN) {
                rc = -EIO;
                goto fail;
        }

        ver_words = (__le16 *)MCDI_PTR(outbuf, GET_VERSION_OUT_VERSION);
        offset = snprintf(buf, len, "%u.%u.%u.%u",
                          le16_to_cpu(ver_words[0]), le16_to_cpu(ver_words[1]),
                          le16_to_cpu(ver_words[2]), le16_to_cpu(ver_words[3]));

        /* EF10 may have multiple datapath firmware variants within a
         * single version.  Report which variants are running.
         */
        if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0) {
                BUILD_BUG_ON(MC_CMD_GET_CAPABILITIES_IN_LEN != 0);
                rc = efx_mcdi_rpc(efx, MC_CMD_GET_CAPABILITIES, NULL, 0,
                                  outbuf, sizeof(outbuf), &outlength);
                if (rc || outlength < MC_CMD_GET_CAPABILITIES_OUT_LEN)
                        offset += snprintf(
                                buf + offset, len - offset, " rx? tx?");
                else
                        offset += snprintf(
                                buf + offset, len - offset, " rx%x tx%x",
                                MCDI_WORD(outbuf,
                                          GET_CAPABILITIES_OUT_RX_DPCPU_FW_ID),
                                MCDI_WORD(outbuf,
                                          GET_CAPABILITIES_OUT_TX_DPCPU_FW_ID));

                /* It's theoretically possible for the string to exceed 31
                 * characters, though in practice the first three version
                 * components are short enough that this doesn't happen.
                 */
                if (WARN_ON(offset >= len))
                        buf[0] = 0;
        }

        return;

fail:
        netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        buf[0] = 0;
}

static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
                               bool *was_attached)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_DRV_ATTACH_IN_LEN);
        MCDI_DECLARE_BUF(outbuf, MC_CMD_DRV_ATTACH_EXT_OUT_LEN);
        size_t outlen;
        int rc;

        MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_NEW_STATE,
                       driver_operating ? 1 : 0);
        MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_UPDATE, 1);
        MCDI_SET_DWORD(inbuf, DRV_ATTACH_IN_FIRMWARE_ID, MC_CMD_FW_LOW_LATENCY);

        rc = efx_mcdi_rpc(efx, MC_CMD_DRV_ATTACH, inbuf, sizeof(inbuf),
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;
        if (outlen < MC_CMD_DRV_ATTACH_OUT_LEN) {
                rc = -EIO;
                goto fail;

        }

        /* We currently assume we have control of the external link
         * and are completely trusted by firmware.  Abort probing
         * if that's not true for this function.
         */
        if (driver_operating &&
            outlen >= MC_CMD_DRV_ATTACH_EXT_OUT_LEN &&
            (MCDI_DWORD(outbuf, DRV_ATTACH_EXT_OUT_FUNC_FLAGS) &
             (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL |
              1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED)) !=
            (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL |
             1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED)) {
                netif_err(efx, probe, efx->net_dev,
                          "This driver version only supports one function per port\n");
                return -ENODEV;
        }

        if (was_attached != NULL)
                *was_attached = MCDI_DWORD(outbuf, DRV_ATTACH_OUT_OLD_STATE);
        return 0;

fail:
        netif_err(efx, probe, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

int efx_mcdi_get_board_cfg(struct efx_nic *efx, u8 *mac_address,
                           u16 *fw_subtype_list, u32 *capabilities)
{
        MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_BOARD_CFG_OUT_LENMAX);
        size_t outlen, i;
        int port_num = efx_port_num(efx);
        int rc;

        BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_IN_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_GET_BOARD_CFG, NULL, 0,
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;

        if (outlen < MC_CMD_GET_BOARD_CFG_OUT_LENMIN) {
                rc = -EIO;
                goto fail;
        }

        if (mac_address)
                memcpy(mac_address,
                       port_num ?
                       MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1) :
                       MCDI_PTR(outbuf, GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0),
                       ETH_ALEN);
        if (fw_subtype_list) {
                for (i = 0;
                     i < MCDI_VAR_ARRAY_LEN(outlen,
                                            GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST);
                     i++)
                        fw_subtype_list[i] = MCDI_ARRAY_WORD(
                                outbuf, GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST, i);
                for (; i < MC_CMD_GET_BOARD_CFG_OUT_FW_SUBTYPE_LIST_MAXNUM; i++)
                        fw_subtype_list[i] = 0;
        }
        if (capabilities) {
                if (port_num)
                        *capabilities = MCDI_DWORD(outbuf,
                                        GET_BOARD_CFG_OUT_CAPABILITIES_PORT1);
                else
                        *capabilities = MCDI_DWORD(outbuf,
                                        GET_BOARD_CFG_OUT_CAPABILITIES_PORT0);
        }

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d len=%d\n",
                  __func__, rc, (int)outlen);

        return rc;
}

int efx_mcdi_log_ctrl(struct efx_nic *efx, bool evq, bool uart, u32 dest_evq)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_LOG_CTRL_IN_LEN);
        u32 dest = 0;
        int rc;

        if (uart)
                dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_UART;
        if (evq)
                dest |= MC_CMD_LOG_CTRL_IN_LOG_DEST_EVQ;

        MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST, dest);
        MCDI_SET_DWORD(inbuf, LOG_CTRL_IN_LOG_DEST_EVQ, dest_evq);

        BUILD_BUG_ON(MC_CMD_LOG_CTRL_OUT_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_LOG_CTRL, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

int efx_mcdi_nvram_types(struct efx_nic *efx, u32 *nvram_types_out)
{
        MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TYPES_OUT_LEN);
        size_t outlen;
        int rc;

        BUILD_BUG_ON(MC_CMD_NVRAM_TYPES_IN_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TYPES, NULL, 0,
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;
        if (outlen < MC_CMD_NVRAM_TYPES_OUT_LEN) {
                rc = -EIO;
                goto fail;
        }

        *nvram_types_out = MCDI_DWORD(outbuf, NVRAM_TYPES_OUT_TYPES);
        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
                  __func__, rc);
        return rc;
}

int efx_mcdi_nvram_info(struct efx_nic *efx, unsigned int type,
                        size_t *size_out, size_t *erase_size_out,
                        bool *protected_out)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_INFO_IN_LEN);
        MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_INFO_OUT_LEN);
        size_t outlen;
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_INFO_IN_TYPE, type);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_INFO, inbuf, sizeof(inbuf),
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;
        if (outlen < MC_CMD_NVRAM_INFO_OUT_LEN) {
                rc = -EIO;
                goto fail;
        }

        *size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_SIZE);
        *erase_size_out = MCDI_DWORD(outbuf, NVRAM_INFO_OUT_ERASESIZE);
        *protected_out = !!(MCDI_DWORD(outbuf, NVRAM_INFO_OUT_FLAGS) &
                                (1 << MC_CMD_NVRAM_INFO_OUT_PROTECTED_LBN));
        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

static int efx_mcdi_nvram_test(struct efx_nic *efx, unsigned int type)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_TEST_IN_LEN);
        MCDI_DECLARE_BUF(outbuf, MC_CMD_NVRAM_TEST_OUT_LEN);
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_TEST_IN_TYPE, type);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_TEST, inbuf, sizeof(inbuf),
                          outbuf, sizeof(outbuf), NULL);
        if (rc)
                return rc;

        switch (MCDI_DWORD(outbuf, NVRAM_TEST_OUT_RESULT)) {
        case MC_CMD_NVRAM_TEST_PASS:
        case MC_CMD_NVRAM_TEST_NOTSUPP:
                return 0;
        default:
                return -EIO;
        }
}

int efx_mcdi_nvram_test_all(struct efx_nic *efx)
{
        u32 nvram_types;
        unsigned int type;
        int rc;

        rc = efx_mcdi_nvram_types(efx, &nvram_types);
        if (rc)
                goto fail1;

        type = 0;
        while (nvram_types != 0) {
                if (nvram_types & 1) {
                        rc = efx_mcdi_nvram_test(efx, type);
                        if (rc)
                                goto fail2;
                }
                type++;
                nvram_types >>= 1;
        }

        return 0;

fail2:
        netif_err(efx, hw, efx->net_dev, "%s: failed type=%u\n",
                  __func__, type);
fail1:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

static int efx_mcdi_read_assertion(struct efx_nic *efx)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_GET_ASSERTS_IN_LEN);
        MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_ASSERTS_OUT_LEN);
        unsigned int flags, index;
        const char *reason;
        size_t outlen;
        int retry;
        int rc;

        /* Attempt to read any stored assertion state before we reboot
         * the mcfw out of the assertion handler. Retry twice, once
         * because a boot-time assertion might cause this command to fail
         * with EINTR. And once again because GET_ASSERTS can race with
         * MC_CMD_REBOOT running on the other port. */
        retry = 2;
        do {
                MCDI_SET_DWORD(inbuf, GET_ASSERTS_IN_CLEAR, 1);
                rc = efx_mcdi_rpc(efx, MC_CMD_GET_ASSERTS,
                                  inbuf, MC_CMD_GET_ASSERTS_IN_LEN,
                                  outbuf, sizeof(outbuf), &outlen);
        } while ((rc == -EINTR || rc == -EIO) && retry-- > 0);

        if (rc)
                return rc;
        if (outlen < MC_CMD_GET_ASSERTS_OUT_LEN)
                return -EIO;

        /* Print out any recorded assertion state */
        flags = MCDI_DWORD(outbuf, GET_ASSERTS_OUT_GLOBAL_FLAGS);
        if (flags == MC_CMD_GET_ASSERTS_FLAGS_NO_FAILS)
                return 0;

        reason = (flags == MC_CMD_GET_ASSERTS_FLAGS_SYS_FAIL)
                ? "system-level assertion"
                : (flags == MC_CMD_GET_ASSERTS_FLAGS_THR_FAIL)
                ? "thread-level assertion"
                : (flags == MC_CMD_GET_ASSERTS_FLAGS_WDOG_FIRED)
                ? "watchdog reset"
                : "unknown assertion";
        netif_err(efx, hw, efx->net_dev,
                  "MCPU %s at PC = 0x%.8x in thread 0x%.8x\n", reason,
                  MCDI_DWORD(outbuf, GET_ASSERTS_OUT_SAVED_PC_OFFS),
                  MCDI_DWORD(outbuf, GET_ASSERTS_OUT_THREAD_OFFS));

        /* Print out the registers */
        for (index = 0;
             index < MC_CMD_GET_ASSERTS_OUT_GP_REGS_OFFS_NUM;
             index++)
                netif_err(efx, hw, efx->net_dev, "R%.2d (?): 0x%.8x\n",
                          1 + index,
                          MCDI_ARRAY_DWORD(outbuf, GET_ASSERTS_OUT_GP_REGS_OFFS,
                                           index));

        return 0;
}

static void efx_mcdi_exit_assertion(struct efx_nic *efx)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);

        /* If the MC is running debug firmware, it might now be
         * waiting for a debugger to attach, but we just want it to
         * reboot.  We set a flag that makes the command a no-op if it
         * has already done so.  We don't know what return code to
         * expect (0 or -EIO), so ignore it.
         */
        BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
        MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS,
                       MC_CMD_REBOOT_FLAGS_AFTER_ASSERTION);
        (void) efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, MC_CMD_REBOOT_IN_LEN,
                            NULL, 0, NULL);
}

int efx_mcdi_handle_assertion(struct efx_nic *efx)
{
        int rc;

        rc = efx_mcdi_read_assertion(efx);
        if (rc)
                return rc;

        efx_mcdi_exit_assertion(efx);

        return 0;
}

void efx_mcdi_set_id_led(struct efx_nic *efx, enum efx_led_mode mode)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_SET_ID_LED_IN_LEN);
        int rc;

        BUILD_BUG_ON(EFX_LED_OFF != MC_CMD_LED_OFF);
        BUILD_BUG_ON(EFX_LED_ON != MC_CMD_LED_ON);
        BUILD_BUG_ON(EFX_LED_DEFAULT != MC_CMD_LED_DEFAULT);

        BUILD_BUG_ON(MC_CMD_SET_ID_LED_OUT_LEN != 0);

        MCDI_SET_DWORD(inbuf, SET_ID_LED_IN_STATE, mode);

        rc = efx_mcdi_rpc(efx, MC_CMD_SET_ID_LED, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        if (rc)
                netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
                          __func__, rc);
}

static int efx_mcdi_reset_port(struct efx_nic *efx)
{
        int rc = efx_mcdi_rpc(efx, MC_CMD_ENTITY_RESET, NULL, 0, NULL, 0, NULL);
        if (rc)
                netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n",
                          __func__, rc);
        return rc;
}

static int efx_mcdi_reset_mc(struct efx_nic *efx)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_REBOOT_IN_LEN);
        int rc;

        BUILD_BUG_ON(MC_CMD_REBOOT_OUT_LEN != 0);
        MCDI_SET_DWORD(inbuf, REBOOT_IN_FLAGS, 0);
        rc = efx_mcdi_rpc(efx, MC_CMD_REBOOT, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        /* White is black, and up is down */
        if (rc == -EIO)
                return 0;
        if (rc == 0)
                rc = -EIO;
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

enum reset_type efx_mcdi_map_reset_reason(enum reset_type reason)
{
        return RESET_TYPE_RECOVER_OR_ALL;
}

int efx_mcdi_reset(struct efx_nic *efx, enum reset_type method)
{
        int rc;

        /* Recover from a failed assertion pre-reset */
        rc = efx_mcdi_handle_assertion(efx);
        if (rc)
                return rc;

        if (method == RESET_TYPE_WORLD)
                return efx_mcdi_reset_mc(efx);
        else
                return efx_mcdi_reset_port(efx);
}

static int efx_mcdi_wol_filter_set(struct efx_nic *efx, u32 type,
                                   const u8 *mac, int *id_out)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_SET_IN_LEN);
        MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_SET_OUT_LEN);
        size_t outlen;
        int rc;

        MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_WOL_TYPE, type);
        MCDI_SET_DWORD(inbuf, WOL_FILTER_SET_IN_FILTER_MODE,
                       MC_CMD_FILTER_MODE_SIMPLE);
        memcpy(MCDI_PTR(inbuf, WOL_FILTER_SET_IN_MAGIC_MAC), mac, ETH_ALEN);

        rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_SET, inbuf, sizeof(inbuf),
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;

        if (outlen < MC_CMD_WOL_FILTER_SET_OUT_LEN) {
                rc = -EIO;
                goto fail;
        }

        *id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_SET_OUT_FILTER_ID);

        return 0;

fail:
        *id_out = -1;
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;

}


int
efx_mcdi_wol_filter_set_magic(struct efx_nic *efx,  const u8 *mac, int *id_out)
{
        return efx_mcdi_wol_filter_set(efx, MC_CMD_WOL_TYPE_MAGIC, mac, id_out);
}


int efx_mcdi_wol_filter_get_magic(struct efx_nic *efx, int *id_out)
{
        MCDI_DECLARE_BUF(outbuf, MC_CMD_WOL_FILTER_GET_OUT_LEN);
        size_t outlen;
        int rc;

        rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_GET, NULL, 0,
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;

        if (outlen < MC_CMD_WOL_FILTER_GET_OUT_LEN) {
                rc = -EIO;
                goto fail;
        }

        *id_out = (int)MCDI_DWORD(outbuf, WOL_FILTER_GET_OUT_FILTER_ID);

        return 0;

fail:
        *id_out = -1;
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}


int efx_mcdi_wol_filter_remove(struct efx_nic *efx, int id)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_WOL_FILTER_REMOVE_IN_LEN);
        int rc;

        MCDI_SET_DWORD(inbuf, WOL_FILTER_REMOVE_IN_FILTER_ID, (u32)id);

        rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_REMOVE, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

int efx_mcdi_flush_rxqs(struct efx_nic *efx)
{
        struct efx_channel *channel;
        struct efx_rx_queue *rx_queue;
        MCDI_DECLARE_BUF(inbuf,
                         MC_CMD_FLUSH_RX_QUEUES_IN_LEN(EFX_MAX_CHANNELS));
        int rc, count;

        BUILD_BUG_ON(EFX_MAX_CHANNELS >
                     MC_CMD_FLUSH_RX_QUEUES_IN_QID_OFST_MAXNUM);

        count = 0;
        efx_for_each_channel(channel, efx) {
                efx_for_each_channel_rx_queue(rx_queue, channel) {
                        if (rx_queue->flush_pending) {
                                rx_queue->flush_pending = false;
                                atomic_dec(&efx->rxq_flush_pending);
                                MCDI_SET_ARRAY_DWORD(
                                        inbuf, FLUSH_RX_QUEUES_IN_QID_OFST,
                                        count, efx_rx_queue_index(rx_queue));
                                count++;
                        }
                }
        }

        rc = efx_mcdi_rpc(efx, MC_CMD_FLUSH_RX_QUEUES, inbuf,
                          MC_CMD_FLUSH_RX_QUEUES_IN_LEN(count), NULL, 0, NULL);
        WARN_ON(rc < 0);

        return rc;
}

int efx_mcdi_wol_filter_reset(struct efx_nic *efx)
{
        int rc;

        rc = efx_mcdi_rpc(efx, MC_CMD_WOL_FILTER_RESET, NULL, 0, NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

int efx_mcdi_set_workaround(struct efx_nic *efx, u32 type, bool enabled)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_WORKAROUND_IN_LEN);

        BUILD_BUG_ON(MC_CMD_WORKAROUND_OUT_LEN != 0);
        MCDI_SET_DWORD(inbuf, WORKAROUND_IN_TYPE, type);
        MCDI_SET_DWORD(inbuf, WORKAROUND_IN_ENABLED, enabled);
        return efx_mcdi_rpc(efx, MC_CMD_WORKAROUND, inbuf, sizeof(inbuf),
                            NULL, 0, NULL);
}

#ifdef CONFIG_SFC_MTD

#define EFX_MCDI_NVRAM_LEN_MAX 128

static int efx_mcdi_nvram_update_start(struct efx_nic *efx, unsigned int type)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_START_IN_LEN);
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_START_IN_TYPE, type);

        BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_START_OUT_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_START, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

static int efx_mcdi_nvram_read(struct efx_nic *efx, unsigned int type,
                               loff_t offset, u8 *buffer, size_t length)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_READ_IN_LEN);
        MCDI_DECLARE_BUF(outbuf,
                         MC_CMD_NVRAM_READ_OUT_LEN(EFX_MCDI_NVRAM_LEN_MAX));
        size_t outlen;
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_TYPE, type);
        MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_OFFSET, offset);
        MCDI_SET_DWORD(inbuf, NVRAM_READ_IN_LENGTH, length);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_READ, inbuf, sizeof(inbuf),
                          outbuf, sizeof(outbuf), &outlen);
        if (rc)
                goto fail;

        memcpy(buffer, MCDI_PTR(outbuf, NVRAM_READ_OUT_READ_BUFFER), length);
        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

static int efx_mcdi_nvram_write(struct efx_nic *efx, unsigned int type,
                                loff_t offset, const u8 *buffer, size_t length)
{
        MCDI_DECLARE_BUF(inbuf,
                         MC_CMD_NVRAM_WRITE_IN_LEN(EFX_MCDI_NVRAM_LEN_MAX));
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_TYPE, type);
        MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_OFFSET, offset);
        MCDI_SET_DWORD(inbuf, NVRAM_WRITE_IN_LENGTH, length);
        memcpy(MCDI_PTR(inbuf, NVRAM_WRITE_IN_WRITE_BUFFER), buffer, length);

        BUILD_BUG_ON(MC_CMD_NVRAM_WRITE_OUT_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_WRITE, inbuf,
                          ALIGN(MC_CMD_NVRAM_WRITE_IN_LEN(length), 4),
                          NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

static int efx_mcdi_nvram_erase(struct efx_nic *efx, unsigned int type,
                                loff_t offset, size_t length)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_ERASE_IN_LEN);
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_TYPE, type);
        MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_OFFSET, offset);
        MCDI_SET_DWORD(inbuf, NVRAM_ERASE_IN_LENGTH, length);

        BUILD_BUG_ON(MC_CMD_NVRAM_ERASE_OUT_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_ERASE, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

static int efx_mcdi_nvram_update_finish(struct efx_nic *efx, unsigned int type)
{
        MCDI_DECLARE_BUF(inbuf, MC_CMD_NVRAM_UPDATE_FINISH_IN_LEN);
        int rc;

        MCDI_SET_DWORD(inbuf, NVRAM_UPDATE_FINISH_IN_TYPE, type);

        BUILD_BUG_ON(MC_CMD_NVRAM_UPDATE_FINISH_OUT_LEN != 0);

        rc = efx_mcdi_rpc(efx, MC_CMD_NVRAM_UPDATE_FINISH, inbuf, sizeof(inbuf),
                          NULL, 0, NULL);
        if (rc)
                goto fail;

        return 0;

fail:
        netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
        return rc;
}

int efx_mcdi_mtd_read(struct mtd_info *mtd, loff_t start,
                      size_t len, size_t *retlen, u8 *buffer)
{
        struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        loff_t offset = start;
        loff_t end = min_t(loff_t, start + len, mtd->size);
        size_t chunk;
        int rc = 0;

        while (offset < end) {
                chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
                rc = efx_mcdi_nvram_read(efx, part->nvram_type, offset,
                                         buffer, chunk);
                if (rc)
                        goto out;
                offset += chunk;
                buffer += chunk;
        }
out:
        *retlen = offset - start;
        return rc;
}

int efx_mcdi_mtd_erase(struct mtd_info *mtd, loff_t start, size_t len)
{
        struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        loff_t offset = start & ~((loff_t)(mtd->erasesize - 1));
        loff_t end = min_t(loff_t, start + len, mtd->size);
        size_t chunk = part->common.mtd.erasesize;
        int rc = 0;

        if (!part->updating) {
                rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
                if (rc)
                        goto out;
                part->updating = true;
        }

        /* The MCDI interface can in fact do multiple erase blocks at once;
         * but erasing may be slow, so we make multiple calls here to avoid
         * tripping the MCDI RPC timeout. */
        while (offset < end) {
                rc = efx_mcdi_nvram_erase(efx, part->nvram_type, offset,
                                          chunk);
                if (rc)
                        goto out;
                offset += chunk;
        }
out:
        return rc;
}

int efx_mcdi_mtd_write(struct mtd_info *mtd, loff_t start,
                       size_t len, size_t *retlen, const u8 *buffer)
{
        struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        loff_t offset = start;
        loff_t end = min_t(loff_t, start + len, mtd->size);
        size_t chunk;
        int rc = 0;

        if (!part->updating) {
                rc = efx_mcdi_nvram_update_start(efx, part->nvram_type);
                if (rc)
                        goto out;
                part->updating = true;
        }

        while (offset < end) {
                chunk = min_t(size_t, end - offset, EFX_MCDI_NVRAM_LEN_MAX);
                rc = efx_mcdi_nvram_write(efx, part->nvram_type, offset,
                                          buffer, chunk);
                if (rc)
                        goto out;
                offset += chunk;
                buffer += chunk;
        }
out:
        *retlen = offset - start;
        return rc;
}

int efx_mcdi_mtd_sync(struct mtd_info *mtd)
{
        struct efx_mcdi_mtd_partition *part = to_efx_mcdi_mtd_partition(mtd);
        struct efx_nic *efx = mtd->priv;
        int rc = 0;

        if (part->updating) {
                part->updating = false;
                rc = efx_mcdi_nvram_update_finish(efx, part->nvram_type);
        }

        return rc;
}

void efx_mcdi_mtd_rename(struct efx_mtd_partition *part)
{
        struct efx_mcdi_mtd_partition *mcdi_part =
                container_of(part, struct efx_mcdi_mtd_partition, common);
        struct efx_nic *efx = part->mtd.priv;

        snprintf(part->name, sizeof(part->name), "%s %s:%02x",
                 efx->name, part->type_name, mcdi_part->fw_subtype);
}

#endif /* CONFIG_SFC_MTD */