ethernet/sfc/mcdi.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /****************************************************************************
0003  * Driver for Solarflare network controllers and boards
0004  * Copyright 2008-2013 Solarflare Communications Inc.
0005  */
0006
0007 #include <linux/delay.h>
0008 #include <linux/moduleparam.h>
0009 #include <linux/atomic.h>
0010 #include "net_driver.h"
0011 #include "nic.h"
0012 #include "io.h"
0013 #include "farch_regs.h"
0014 #include "mcdi_pcol.h"
0015
0016 /**************************************************************************
0017  *
0018  * Management-Controller-to-Driver Interface
0019  *
0020  **************************************************************************
0021  */
0022
0023 #define MCDI_RPC_TIMEOUT       (10 * HZ)
0024
0025 /* A reboot/assertion causes the MCDI status word to be set after the
0026  * command word is set or a REBOOT event is sent. If we notice a reboot
0027  * via these mechanisms then wait 250ms for the status word to be set.
0028  */
0029 #define MCDI_STATUS_DELAY_US        100
0030 #define MCDI_STATUS_DELAY_COUNT     2500
0031 #define MCDI_STATUS_SLEEP_MS                        \
0032     (MCDI_STATUS_DELAY_US * MCDI_STATUS_DELAY_COUNT / 1000)
0033
0034 #define SEQ_MASK                            \
0035     EFX_MASK32(EFX_WIDTH(MCDI_HEADER_SEQ))
0036
0037 struct efx_mcdi_async_param {
0038     struct list_head list;
0039     unsigned int cmd;
0040     size_t inlen;
0041     size_t outlen;
0042     bool quiet;
0043     efx_mcdi_async_completer *complete;
0044     unsigned long cookie;
0045     /* followed by request/response buffer */
0046 };
0047
0048 static void efx_mcdi_timeout_async(struct timer_list *t);
0049 static int efx_mcdi_drv_attach(struct efx_nic *efx, bool driver_operating,
0050                    bool *was_attached_out);
0051 static bool efx_mcdi_poll_once(struct efx_nic *efx);
0052 static void efx_mcdi_abandon(struct efx_nic *efx);
0053
0054 #ifdef CONFIG_SFC_MCDI_LOGGING
0055 static bool mcdi_logging_default;
0056 module_param(mcdi_logging_default, bool, 0644);
0057 MODULE_PARM_DESC(mcdi_logging_default,
0058          "Enable MCDI logging on newly-probed functions");
0059 #endif
0060
0061 int efx_mcdi_init(struct efx_nic *efx)
0062 {
0063     struct efx_mcdi_iface *mcdi;
0064     bool already_attached;
0065     int rc = -ENOMEM;
0066
0067     efx->mcdi = kzalloc(sizeof(*efx->mcdi), GFP_KERNEL);
0068     if (!efx->mcdi)
0069         goto fail;
0070
0071     mcdi = efx_mcdi(efx);
0072     mcdi->efx = efx;
0073 #ifdef CONFIG_SFC_MCDI_LOGGING
0074     /* consuming code assumes buffer is page-sized */
0075     mcdi->logging_buffer = (char *)__get_free_page(GFP_KERNEL);
0076     if (!mcdi->logging_buffer)
0077         goto fail1;
0078     mcdi->logging_enabled = mcdi_logging_default;
0079 #endif
0080     init_waitqueue_head(&mcdi->wq);
0081     init_waitqueue_head(&mcdi->proxy_rx_wq);
0082     spin_lock_init(&mcdi->iface_lock);
0083     mcdi->state = MCDI_STATE_QUIESCENT;
0084     mcdi->mode = MCDI_MODE_POLL;
0085     spin_lock_init(&mcdi->async_lock);
0086     INIT_LIST_HEAD(&mcdi->async_list);
0087     timer_setup(&mcdi->async_timer, efx_mcdi_timeout_async, 0);
0088
0089     (void) efx_mcdi_poll_reboot(efx);
0090     mcdi->new_epoch = true;
0091
0092     /* Recover from a failed assertion before probing */
0093     rc = efx_mcdi_handle_assertion(efx);
0094     if (rc)
0095         goto fail2;
0096
0097     /* Let the MC (and BMC, if this is a LOM) know that the driver
0098      * is loaded. We should do this before we reset the NIC.
0099      */
0100     rc = efx_mcdi_drv_attach(efx, true, &already_attached);
0101     if (rc) {
0102         pci_err(efx->pci_dev, "Unable to register driver with MCPU\n");
0103         goto fail2;
0104     }
0105     if (already_attached)
0106         /* Not a fatal error */
0107         pci_err(efx->pci_dev, "Host already registered with MCPU\n");
0108
0109     if (efx->mcdi->fn_flags &
0110         (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY))
0111         efx->primary = efx;
0112
0113     return 0;
0114 fail2:
0115 #ifdef CONFIG_SFC_MCDI_LOGGING
0116     free_page((unsigned long)mcdi->logging_buffer);
0117 fail1:
0118 #endif
0119     kfree(efx->mcdi);
0120     efx->mcdi = NULL;
0121 fail:
0122     return rc;
0123 }
0124
0125 void efx_mcdi_detach(struct efx_nic *efx)
0126 {
0127     if (!efx->mcdi)
0128         return;
0129
0130     BUG_ON(efx->mcdi->iface.state != MCDI_STATE_QUIESCENT);
0131
0132     /* Relinquish the device (back to the BMC, if this is a LOM) */
0133     efx_mcdi_drv_attach(efx, false, NULL);
0134 }
0135
0136 void efx_mcdi_fini(struct efx_nic *efx)
0137 {
0138     if (!efx->mcdi)
0139         return;
0140
0141 #ifdef CONFIG_SFC_MCDI_LOGGING
0142     free_page((unsigned long)efx->mcdi->iface.logging_buffer);
0143 #endif
0144
0145     kfree(efx->mcdi);
0146 }
0147
0148 static void efx_mcdi_send_request(struct efx_nic *efx, unsigned cmd,
0149                   const efx_dword_t *inbuf, size_t inlen)
0150 {
0151     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0152 #ifdef CONFIG_SFC_MCDI_LOGGING
0153     char *buf = mcdi->logging_buffer; /* page-sized */
0154 #endif
0155     efx_dword_t hdr[2];
0156     size_t hdr_len;
0157     u32 xflags, seqno;
0158
0159     BUG_ON(mcdi->state == MCDI_STATE_QUIESCENT);
0160
0161     /* Serialise with efx_mcdi_ev_cpl() and efx_mcdi_ev_death() */
0162     spin_lock_bh(&mcdi->iface_lock);
0163     ++mcdi->seqno;
0164     seqno = mcdi->seqno & SEQ_MASK;
0165     spin_unlock_bh(&mcdi->iface_lock);
0166
0167     xflags = 0;
0168     if (mcdi->mode == MCDI_MODE_EVENTS)
0169         xflags |= MCDI_HEADER_XFLAGS_EVREQ;
0170
0171     if (efx->type->mcdi_max_ver == 1) {
0172         /* MCDI v1 */
0173         EFX_POPULATE_DWORD_7(hdr[0],
0174                      MCDI_HEADER_RESPONSE, 0,
0175                      MCDI_HEADER_RESYNC, 1,
0176                      MCDI_HEADER_CODE, cmd,
0177                      MCDI_HEADER_DATALEN, inlen,
0178                      MCDI_HEADER_SEQ, seqno,
0179                      MCDI_HEADER_XFLAGS, xflags,
0180                      MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
0181         hdr_len = 4;
0182     } else {
0183         /* MCDI v2 */
0184         BUG_ON(inlen > MCDI_CTL_SDU_LEN_MAX_V2);
0185         EFX_POPULATE_DWORD_7(hdr[0],
0186                      MCDI_HEADER_RESPONSE, 0,
0187                      MCDI_HEADER_RESYNC, 1,
0188                      MCDI_HEADER_CODE, MC_CMD_V2_EXTN,
0189                      MCDI_HEADER_DATALEN, 0,
0190                      MCDI_HEADER_SEQ, seqno,
0191                      MCDI_HEADER_XFLAGS, xflags,
0192                      MCDI_HEADER_NOT_EPOCH, !mcdi->new_epoch);
0193         EFX_POPULATE_DWORD_2(hdr[1],
0194                      MC_CMD_V2_EXTN_IN_EXTENDED_CMD, cmd,
0195                      MC_CMD_V2_EXTN_IN_ACTUAL_LEN, inlen);
0196         hdr_len = 8;
0197     }
0198
0199 #ifdef CONFIG_SFC_MCDI_LOGGING
0200     if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
0201         int bytes = 0;
0202         int i;
0203         /* Lengths should always be a whole number of dwords, so scream
0204          * if they're not.
0205          */
0206         WARN_ON_ONCE(hdr_len % 4);
0207         WARN_ON_ONCE(inlen % 4);
0208
0209         /* We own the logging buffer, as only one MCDI can be in
0210          * progress on a NIC at any one time.  So no need for locking.
0211          */
0212         for (i = 0; i < hdr_len / 4 && bytes < PAGE_SIZE; i++)
0213             bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
0214                        " %08x",
0215                        le32_to_cpu(hdr[i].u32[0]));
0216
0217         for (i = 0; i < inlen / 4 && bytes < PAGE_SIZE; i++)
0218             bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
0219                        " %08x",
0220                        le32_to_cpu(inbuf[i].u32[0]));
0221
0222         netif_info(efx, hw, efx->net_dev, "MCDI RPC REQ:%s\n", buf);
0223     }
0224 #endif
0225
0226     efx->type->mcdi_request(efx, hdr, hdr_len, inbuf, inlen);
0227
0228     mcdi->new_epoch = false;
0229 }
0230
0231 static int efx_mcdi_errno(unsigned int mcdi_err)
0232 {
0233     switch (mcdi_err) {
0234     case 0:
0235         return 0;
0236 #define TRANSLATE_ERROR(name)                   \
0237     case MC_CMD_ERR_ ## name:               \
0238         return -name;
0239     TRANSLATE_ERROR(EPERM);
0240     TRANSLATE_ERROR(ENOENT);
0241     TRANSLATE_ERROR(EINTR);
0242     TRANSLATE_ERROR(EAGAIN);
0243     TRANSLATE_ERROR(EACCES);
0244     TRANSLATE_ERROR(EBUSY);
0245     TRANSLATE_ERROR(EINVAL);
0246     TRANSLATE_ERROR(EDEADLK);
0247     TRANSLATE_ERROR(ENOSYS);
0248     TRANSLATE_ERROR(ETIME);
0249     TRANSLATE_ERROR(EALREADY);
0250     TRANSLATE_ERROR(ENOSPC);
0251 #undef TRANSLATE_ERROR
0252     case MC_CMD_ERR_ENOTSUP:
0253         return -EOPNOTSUPP;
0254     case MC_CMD_ERR_ALLOC_FAIL:
0255         return -ENOBUFS;
0256     case MC_CMD_ERR_MAC_EXIST:
0257         return -EADDRINUSE;
0258     default:
0259         return -EPROTO;
0260     }
0261 }
0262
0263 static void efx_mcdi_read_response_header(struct efx_nic *efx)
0264 {
0265     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0266     unsigned int respseq, respcmd, error;
0267 #ifdef CONFIG_SFC_MCDI_LOGGING
0268     char *buf = mcdi->logging_buffer; /* page-sized */
0269 #endif
0270     efx_dword_t hdr;
0271
0272     efx->type->mcdi_read_response(efx, &hdr, 0, 4);
0273     respseq = EFX_DWORD_FIELD(hdr, MCDI_HEADER_SEQ);
0274     respcmd = EFX_DWORD_FIELD(hdr, MCDI_HEADER_CODE);
0275     error = EFX_DWORD_FIELD(hdr, MCDI_HEADER_ERROR);
0276
0277     if (respcmd != MC_CMD_V2_EXTN) {
0278         mcdi->resp_hdr_len = 4;
0279         mcdi->resp_data_len = EFX_DWORD_FIELD(hdr, MCDI_HEADER_DATALEN);
0280     } else {
0281         efx->type->mcdi_read_response(efx, &hdr, 4, 4);
0282         mcdi->resp_hdr_len = 8;
0283         mcdi->resp_data_len =
0284             EFX_DWORD_FIELD(hdr, MC_CMD_V2_EXTN_IN_ACTUAL_LEN);
0285     }
0286
0287 #ifdef CONFIG_SFC_MCDI_LOGGING
0288     if (mcdi->logging_enabled && !WARN_ON_ONCE(!buf)) {
0289         size_t hdr_len, data_len;
0290         int bytes = 0;
0291         int i;
0292
0293         WARN_ON_ONCE(mcdi->resp_hdr_len % 4);
0294         hdr_len = mcdi->resp_hdr_len / 4;
0295         /* MCDI_DECLARE_BUF ensures that underlying buffer is padded
0296          * to dword size, and the MCDI buffer is always dword size
0297          */
0298         data_len = DIV_ROUND_UP(mcdi->resp_data_len, 4);
0299
0300         /* We own the logging buffer, as only one MCDI can be in
0301          * progress on a NIC at any one time.  So no need for locking.
0302          */
0303         for (i = 0; i < hdr_len && bytes < PAGE_SIZE; i++) {
0304             efx->type->mcdi_read_response(efx, &hdr, (i * 4), 4);
0305             bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
0306                        " %08x", le32_to_cpu(hdr.u32[0]));
0307         }
0308
0309         for (i = 0; i < data_len && bytes < PAGE_SIZE; i++) {
0310             efx->type->mcdi_read_response(efx, &hdr,
0311                     mcdi->resp_hdr_len + (i * 4), 4);
0312             bytes += scnprintf(buf + bytes, PAGE_SIZE - bytes,
0313                        " %08x", le32_to_cpu(hdr.u32[0]));
0314         }
0315
0316         netif_info(efx, hw, efx->net_dev, "MCDI RPC RESP:%s\n", buf);
0317     }
0318 #endif
0319
0320     mcdi->resprc_raw = 0;
0321     if (error && mcdi->resp_data_len == 0) {
0322         netif_err(efx, hw, efx->net_dev, "MC rebooted\n");
0323         mcdi->resprc = -EIO;
0324     } else if ((respseq ^ mcdi->seqno) & SEQ_MASK) {
0325         netif_err(efx, hw, efx->net_dev,
0326               "MC response mismatch tx seq 0x%x rx seq 0x%x\n",
0327               respseq, mcdi->seqno);
0328         mcdi->resprc = -EIO;
0329     } else if (error) {
0330         efx->type->mcdi_read_response(efx, &hdr, mcdi->resp_hdr_len, 4);
0331         mcdi->resprc_raw = EFX_DWORD_FIELD(hdr, EFX_DWORD_0);
0332         mcdi->resprc = efx_mcdi_errno(mcdi->resprc_raw);
0333     } else {
0334         mcdi->resprc = 0;
0335     }
0336 }
0337
0338 static bool efx_mcdi_poll_once(struct efx_nic *efx)
0339 {
0340     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0341
0342     rmb();
0343     if (!efx->type->mcdi_poll_response(efx))
0344         return false;
0345
0346     spin_lock_bh(&mcdi->iface_lock);
0347     efx_mcdi_read_response_header(efx);
0348     spin_unlock_bh(&mcdi->iface_lock);
0349
0350     return true;
0351 }
0352
0353 static int efx_mcdi_poll(struct efx_nic *efx)
0354 {
0355     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0356     unsigned long time, finish;
0357     unsigned int spins;
0358     int rc;
0359
0360     /* Check for a reboot atomically with respect to efx_mcdi_copyout() */
0361     rc = efx_mcdi_poll_reboot(efx);
0362     if (rc) {
0363         spin_lock_bh(&mcdi->iface_lock);
0364         mcdi->resprc = rc;
0365         mcdi->resp_hdr_len = 0;
0366         mcdi->resp_data_len = 0;
0367         spin_unlock_bh(&mcdi->iface_lock);
0368         return 0;
0369     }
0370
0371     /* Poll for completion. Poll quickly (once a us) for the 1st jiffy,
0372      * because generally mcdi responses are fast. After that, back off
0373      * and poll once a jiffy (approximately)
0374      */
0375     spins = USER_TICK_USEC;
0376     finish = jiffies + MCDI_RPC_TIMEOUT;
0377
0378     while (1) {
0379         if (spins != 0) {
0380             --spins;
0381             udelay(1);
0382         } else {
0383             schedule_timeout_uninterruptible(1);
0384         }
0385
0386         time = jiffies;
0387
0388         if (efx_mcdi_poll_once(efx))
0389             break;
0390
0391         if (time_after(time, finish))
0392             return -ETIMEDOUT;
0393     }
0394
0395     /* Return rc=0 like wait_event_timeout() */
0396     return 0;
0397 }
0398
0399 /* Test and clear MC-rebooted flag for this port/function; reset
0400  * software state as necessary.
0401  */
0402 int efx_mcdi_poll_reboot(struct efx_nic *efx)
0403 {
0404     if (!efx->mcdi)
0405         return 0;
0406
0407     return efx->type->mcdi_poll_reboot(efx);
0408 }
0409
0410 static bool efx_mcdi_acquire_async(struct efx_mcdi_iface *mcdi)
0411 {
0412     return cmpxchg(&mcdi->state,
0413                MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_ASYNC) ==
0414         MCDI_STATE_QUIESCENT;
0415 }
0416
0417 static void efx_mcdi_acquire_sync(struct efx_mcdi_iface *mcdi)
0418 {
0419     /* Wait until the interface becomes QUIESCENT and we win the race
0420      * to mark it RUNNING_SYNC.
0421      */
0422     wait_event(mcdi->wq,
0423            cmpxchg(&mcdi->state,
0424                MCDI_STATE_QUIESCENT, MCDI_STATE_RUNNING_SYNC) ==
0425            MCDI_STATE_QUIESCENT);
0426 }
0427
0428 static int efx_mcdi_await_completion(struct efx_nic *efx)
0429 {
0430     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0431
0432     if (wait_event_timeout(mcdi->wq, mcdi->state == MCDI_STATE_COMPLETED,
0433                    MCDI_RPC_TIMEOUT) == 0)
0434         return -ETIMEDOUT;
0435
0436     /* Check if efx_mcdi_set_mode() switched us back to polled completions.
0437      * In which case, poll for completions directly. If efx_mcdi_ev_cpl()
0438      * completed the request first, then we'll just end up completing the
0439      * request again, which is safe.
0440      *
0441      * We need an smp_rmb() to synchronise with efx_mcdi_mode_poll(), which
0442      * wait_event_timeout() implicitly provides.
0443      */
0444     if (mcdi->mode == MCDI_MODE_POLL)
0445         return efx_mcdi_poll(efx);
0446
0447     return 0;
0448 }
0449
0450 /* If the interface is RUNNING_SYNC, switch to COMPLETED and wake the
0451  * requester.  Return whether this was done.  Does not take any locks.
0452  */
0453 static bool efx_mcdi_complete_sync(struct efx_mcdi_iface *mcdi)
0454 {
0455     if (cmpxchg(&mcdi->state,
0456             MCDI_STATE_RUNNING_SYNC, MCDI_STATE_COMPLETED) ==
0457         MCDI_STATE_RUNNING_SYNC) {
0458         wake_up(&mcdi->wq);
0459         return true;
0460     }
0461
0462     return false;
0463 }
0464
0465 static void efx_mcdi_release(struct efx_mcdi_iface *mcdi)
0466 {
0467     if (mcdi->mode == MCDI_MODE_EVENTS) {
0468         struct efx_mcdi_async_param *async;
0469         struct efx_nic *efx = mcdi->efx;
0470
0471         /* Process the asynchronous request queue */
0472         spin_lock_bh(&mcdi->async_lock);
0473         async = list_first_entry_or_null(
0474             &mcdi->async_list, struct efx_mcdi_async_param, list);
0475         if (async) {
0476             mcdi->state = MCDI_STATE_RUNNING_ASYNC;
0477             efx_mcdi_send_request(efx, async->cmd,
0478                           (const efx_dword_t *)(async + 1),
0479                           async->inlen);
0480             mod_timer(&mcdi->async_timer,
0481                   jiffies + MCDI_RPC_TIMEOUT);
0482         }
0483         spin_unlock_bh(&mcdi->async_lock);
0484
0485         if (async)
0486             return;
0487     }
0488
0489     mcdi->state = MCDI_STATE_QUIESCENT;
0490     wake_up(&mcdi->wq);
0491 }
0492
0493 /* If the interface is RUNNING_ASYNC, switch to COMPLETED, call the
0494  * asynchronous completion function, and release the interface.
0495  * Return whether this was done.  Must be called in bh-disabled
0496  * context.  Will take iface_lock and async_lock.
0497  */
0498 static bool efx_mcdi_complete_async(struct efx_mcdi_iface *mcdi, bool timeout)
0499 {
0500     struct efx_nic *efx = mcdi->efx;
0501     struct efx_mcdi_async_param *async;
0502     size_t hdr_len, data_len, err_len;
0503     efx_dword_t *outbuf;
0504     MCDI_DECLARE_BUF_ERR(errbuf);
0505     int rc;
0506
0507     if (cmpxchg(&mcdi->state,
0508             MCDI_STATE_RUNNING_ASYNC, MCDI_STATE_COMPLETED) !=
0509         MCDI_STATE_RUNNING_ASYNC)
0510         return false;
0511
0512     spin_lock(&mcdi->iface_lock);
0513     if (timeout) {
0514         /* Ensure that if the completion event arrives later,
0515          * the seqno check in efx_mcdi_ev_cpl() will fail
0516          */
0517         ++mcdi->seqno;
0518         ++mcdi->credits;
0519         rc = -ETIMEDOUT;
0520         hdr_len = 0;
0521         data_len = 0;
0522     } else {
0523         rc = mcdi->resprc;
0524         hdr_len = mcdi->resp_hdr_len;
0525         data_len = mcdi->resp_data_len;
0526     }
0527     spin_unlock(&mcdi->iface_lock);
0528
0529     /* Stop the timer.  In case the timer function is running, we
0530      * must wait for it to return so that there is no possibility
0531      * of it aborting the next request.
0532      */
0533     if (!timeout)
0534         del_timer_sync(&mcdi->async_timer);
0535
0536     spin_lock(&mcdi->async_lock);
0537     async = list_first_entry(&mcdi->async_list,
0538                  struct efx_mcdi_async_param, list);
0539     list_del(&async->list);
0540     spin_unlock(&mcdi->async_lock);
0541
0542     outbuf = (efx_dword_t *)(async + 1);
0543     efx->type->mcdi_read_response(efx, outbuf, hdr_len,
0544                       min(async->outlen, data_len));
0545     if (!timeout && rc && !async->quiet) {
0546         err_len = min(sizeof(errbuf), data_len);
0547         efx->type->mcdi_read_response(efx, errbuf, hdr_len,
0548                           sizeof(errbuf));
0549         efx_mcdi_display_error(efx, async->cmd, async->inlen, errbuf,
0550                        err_len, rc);
0551     }
0552
0553     if (async->complete)
0554         async->complete(efx, async->cookie, rc, outbuf,
0555                 min(async->outlen, data_len));
0556     kfree(async);
0557
0558     efx_mcdi_release(mcdi);
0559
0560     return true;
0561 }
0562
0563 static void efx_mcdi_ev_cpl(struct efx_nic *efx, unsigned int seqno,
0564                 unsigned int datalen, unsigned int mcdi_err)
0565 {
0566     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0567     bool wake = false;
0568
0569     spin_lock(&mcdi->iface_lock);
0570
0571     if ((seqno ^ mcdi->seqno) & SEQ_MASK) {
0572         if (mcdi->credits)
0573             /* The request has been cancelled */
0574             --mcdi->credits;
0575         else
0576             netif_err(efx, hw, efx->net_dev,
0577                   "MC response mismatch tx seq 0x%x rx "
0578                   "seq 0x%x\n", seqno, mcdi->seqno);
0579     } else {
0580         if (efx->type->mcdi_max_ver >= 2) {
0581             /* MCDI v2 responses don't fit in an event */
0582             efx_mcdi_read_response_header(efx);
0583         } else {
0584             mcdi->resprc = efx_mcdi_errno(mcdi_err);
0585             mcdi->resp_hdr_len = 4;
0586             mcdi->resp_data_len = datalen;
0587         }
0588
0589         wake = true;
0590     }
0591
0592     spin_unlock(&mcdi->iface_lock);
0593
0594     if (wake) {
0595         if (!efx_mcdi_complete_async(mcdi, false))
0596             (void) efx_mcdi_complete_sync(mcdi);
0597
0598         /* If the interface isn't RUNNING_ASYNC or
0599          * RUNNING_SYNC then we've received a duplicate
0600          * completion after we've already transitioned back to
0601          * QUIESCENT. [A subsequent invocation would increment
0602          * seqno, so would have failed the seqno check].
0603          */
0604     }
0605 }
0606
0607 static void efx_mcdi_timeout_async(struct timer_list *t)
0608 {
0609     struct efx_mcdi_iface *mcdi = from_timer(mcdi, t, async_timer);
0610
0611     efx_mcdi_complete_async(mcdi, true);
0612 }
0613
0614 static int
0615 efx_mcdi_check_supported(struct efx_nic *efx, unsigned int cmd, size_t inlen)
0616 {
0617     if (efx->type->mcdi_max_ver < 0 ||
0618          (efx->type->mcdi_max_ver < 2 &&
0619           cmd > MC_CMD_CMD_SPACE_ESCAPE_7))
0620         return -EINVAL;
0621
0622     if (inlen > MCDI_CTL_SDU_LEN_MAX_V2 ||
0623         (efx->type->mcdi_max_ver < 2 &&
0624          inlen > MCDI_CTL_SDU_LEN_MAX_V1))
0625         return -EMSGSIZE;
0626
0627     return 0;
0628 }
0629
0630 static bool efx_mcdi_get_proxy_handle(struct efx_nic *efx,
0631                       size_t hdr_len, size_t data_len,
0632                       u32 *proxy_handle)
0633 {
0634     MCDI_DECLARE_BUF_ERR(testbuf);
0635     const size_t buflen = sizeof(testbuf);
0636
0637     if (!proxy_handle || data_len < buflen)
0638         return false;
0639
0640     efx->type->mcdi_read_response(efx, testbuf, hdr_len, buflen);
0641     if (MCDI_DWORD(testbuf, ERR_CODE) == MC_CMD_ERR_PROXY_PENDING) {
0642         *proxy_handle = MCDI_DWORD(testbuf, ERR_PROXY_PENDING_HANDLE);
0643         return true;
0644     }
0645
0646     return false;
0647 }
0648
0649 static int _efx_mcdi_rpc_finish(struct efx_nic *efx, unsigned int cmd,
0650                 size_t inlen,
0651                 efx_dword_t *outbuf, size_t outlen,
0652                 size_t *outlen_actual, bool quiet,
0653                 u32 *proxy_handle, int *raw_rc)
0654 {
0655     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0656     MCDI_DECLARE_BUF_ERR(errbuf);
0657     int rc;
0658
0659     if (mcdi->mode == MCDI_MODE_POLL)
0660         rc = efx_mcdi_poll(efx);
0661     else
0662         rc = efx_mcdi_await_completion(efx);
0663
0664     if (rc != 0) {
0665         netif_err(efx, hw, efx->net_dev,
0666               "MC command 0x%x inlen %d mode %d timed out\n",
0667               cmd, (int)inlen, mcdi->mode);
0668
0669         if (mcdi->mode == MCDI_MODE_EVENTS && efx_mcdi_poll_once(efx)) {
0670             netif_err(efx, hw, efx->net_dev,
0671                   "MCDI request was completed without an event\n");
0672             rc = 0;
0673         }
0674
0675         efx_mcdi_abandon(efx);
0676
0677         /* Close the race with efx_mcdi_ev_cpl() executing just too late
0678          * and completing a request we've just cancelled, by ensuring
0679          * that the seqno check therein fails.
0680          */
0681         spin_lock_bh(&mcdi->iface_lock);
0682         ++mcdi->seqno;
0683         ++mcdi->credits;
0684         spin_unlock_bh(&mcdi->iface_lock);
0685     }
0686
0687     if (proxy_handle)
0688         *proxy_handle = 0;
0689
0690     if (rc != 0) {
0691         if (outlen_actual)
0692             *outlen_actual = 0;
0693     } else {
0694         size_t hdr_len, data_len, err_len;
0695
0696         /* At the very least we need a memory barrier here to ensure
0697          * we pick up changes from efx_mcdi_ev_cpl(). Protect against
0698          * a spurious efx_mcdi_ev_cpl() running concurrently by
0699          * acquiring the iface_lock. */
0700         spin_lock_bh(&mcdi->iface_lock);
0701         rc = mcdi->resprc;
0702         if (raw_rc)
0703             *raw_rc = mcdi->resprc_raw;
0704         hdr_len = mcdi->resp_hdr_len;
0705         data_len = mcdi->resp_data_len;
0706         err_len = min(sizeof(errbuf), data_len);
0707         spin_unlock_bh(&mcdi->iface_lock);
0708
0709         BUG_ON(rc > 0);
0710
0711         efx->type->mcdi_read_response(efx, outbuf, hdr_len,
0712                           min(outlen, data_len));
0713         if (outlen_actual)
0714             *outlen_actual = data_len;
0715
0716         efx->type->mcdi_read_response(efx, errbuf, hdr_len, err_len);
0717
0718         if (cmd == MC_CMD_REBOOT && rc == -EIO) {
0719             /* Don't reset if MC_CMD_REBOOT returns EIO */
0720         } else if (rc == -EIO || rc == -EINTR) {
0721             netif_err(efx, hw, efx->net_dev, "MC reboot detected\n");
0722             netif_dbg(efx, hw, efx->net_dev, "MC rebooted during command %d rc %d\n",
0723                   cmd, -rc);
0724             if (efx->type->mcdi_reboot_detected)
0725                 efx->type->mcdi_reboot_detected(efx);
0726             efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
0727         } else if (proxy_handle && (rc == -EPROTO) &&
0728                efx_mcdi_get_proxy_handle(efx, hdr_len, data_len,
0729                              proxy_handle)) {
0730             mcdi->proxy_rx_status = 0;
0731             mcdi->proxy_rx_handle = 0;
0732             mcdi->state = MCDI_STATE_PROXY_WAIT;
0733         } else if (rc && !quiet) {
0734             efx_mcdi_display_error(efx, cmd, inlen, errbuf, err_len,
0735                            rc);
0736         }
0737
0738         if (rc == -EIO || rc == -EINTR) {
0739             msleep(MCDI_STATUS_SLEEP_MS);
0740             efx_mcdi_poll_reboot(efx);
0741             mcdi->new_epoch = true;
0742         }
0743     }
0744
0745     if (!proxy_handle || !*proxy_handle)
0746         efx_mcdi_release(mcdi);
0747     return rc;
0748 }
0749
0750 static void efx_mcdi_proxy_abort(struct efx_mcdi_iface *mcdi)
0751 {
0752     if (mcdi->state == MCDI_STATE_PROXY_WAIT) {
0753         /* Interrupt the proxy wait. */
0754         mcdi->proxy_rx_status = -EINTR;
0755         wake_up(&mcdi->proxy_rx_wq);
0756     }
0757 }
0758
0759 static void efx_mcdi_ev_proxy_response(struct efx_nic *efx,
0760                        u32 handle, int status)
0761 {
0762     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0763
0764     WARN_ON(mcdi->state != MCDI_STATE_PROXY_WAIT);
0765
0766     mcdi->proxy_rx_status = efx_mcdi_errno(status);
0767     /* Ensure the status is written before we update the handle, since the
0768      * latter is used to check if we've finished.
0769      */
0770     wmb();
0771     mcdi->proxy_rx_handle = handle;
0772     wake_up(&mcdi->proxy_rx_wq);
0773 }
0774
0775 static int efx_mcdi_proxy_wait(struct efx_nic *efx, u32 handle, bool quiet)
0776 {
0777     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0778     int rc;
0779
0780     /* Wait for a proxy event, or timeout. */
0781     rc = wait_event_timeout(mcdi->proxy_rx_wq,
0782                 mcdi->proxy_rx_handle != 0 ||
0783                 mcdi->proxy_rx_status == -EINTR,
0784                 MCDI_RPC_TIMEOUT);
0785
0786     if (rc <= 0) {
0787         netif_dbg(efx, hw, efx->net_dev,
0788               "MCDI proxy timeout %d\n", handle);
0789         return -ETIMEDOUT;
0790     } else if (mcdi->proxy_rx_handle != handle) {
0791         netif_warn(efx, hw, efx->net_dev,
0792                "MCDI proxy unexpected handle %d (expected %d)\n",
0793                mcdi->proxy_rx_handle, handle);
0794         return -EINVAL;
0795     }
0796
0797     return mcdi->proxy_rx_status;
0798 }
0799
0800 static int _efx_mcdi_rpc(struct efx_nic *efx, unsigned int cmd,
0801              const efx_dword_t *inbuf, size_t inlen,
0802              efx_dword_t *outbuf, size_t outlen,
0803              size_t *outlen_actual, bool quiet, int *raw_rc)
0804 {
0805     u32 proxy_handle = 0; /* Zero is an invalid proxy handle. */
0806     int rc;
0807
0808     if (inbuf && inlen && (inbuf == outbuf)) {
0809         /* The input buffer can't be aliased with the output. */
0810         WARN_ON(1);
0811         return -EINVAL;
0812     }
0813
0814     rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen);
0815     if (rc)
0816         return rc;
0817
0818     rc = _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen,
0819                   outlen_actual, quiet, &proxy_handle, raw_rc);
0820
0821     if (proxy_handle) {
0822         /* Handle proxy authorisation. This allows approval of MCDI
0823          * operations to be delegated to the admin function, allowing
0824          * fine control over (eg) multicast subscriptions.
0825          */
0826         struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0827
0828         netif_dbg(efx, hw, efx->net_dev,
0829               "MCDI waiting for proxy auth %d\n",
0830               proxy_handle);
0831         rc = efx_mcdi_proxy_wait(efx, proxy_handle, quiet);
0832
0833         if (rc == 0) {
0834             netif_dbg(efx, hw, efx->net_dev,
0835                   "MCDI proxy retry %d\n", proxy_handle);
0836
0837             /* We now retry the original request. */
0838             mcdi->state = MCDI_STATE_RUNNING_SYNC;
0839             efx_mcdi_send_request(efx, cmd, inbuf, inlen);
0840
0841             rc = _efx_mcdi_rpc_finish(efx, cmd, inlen,
0842                           outbuf, outlen, outlen_actual,
0843                           quiet, NULL, raw_rc);
0844         } else {
0845             netif_cond_dbg(efx, hw, efx->net_dev, rc == -EPERM, err,
0846                        "MC command 0x%x failed after proxy auth rc=%d\n",
0847                        cmd, rc);
0848
0849             if (rc == -EINTR || rc == -EIO)
0850                 efx_schedule_reset(efx, RESET_TYPE_MC_FAILURE);
0851             efx_mcdi_release(mcdi);
0852         }
0853     }
0854
0855     return rc;
0856 }
0857
0858 static int _efx_mcdi_rpc_evb_retry(struct efx_nic *efx, unsigned cmd,
0859                    const efx_dword_t *inbuf, size_t inlen,
0860                    efx_dword_t *outbuf, size_t outlen,
0861                    size_t *outlen_actual, bool quiet)
0862 {
0863     int raw_rc = 0;
0864     int rc;
0865
0866     rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
0867                outbuf, outlen, outlen_actual, true, &raw_rc);
0868
0869     if ((rc == -EPROTO) && (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
0870         efx->type->is_vf) {
0871         /* If the EVB port isn't available within a VF this may
0872          * mean the PF is still bringing the switch up. We should
0873          * retry our request shortly.
0874          */
0875         unsigned long abort_time = jiffies + MCDI_RPC_TIMEOUT;
0876         unsigned int delay_us = 10000;
0877
0878         netif_dbg(efx, hw, efx->net_dev,
0879               "%s: NO_EVB_PORT; will retry request\n",
0880               __func__);
0881
0882         do {
0883             usleep_range(delay_us, delay_us + 10000);
0884             rc = _efx_mcdi_rpc(efx, cmd, inbuf, inlen,
0885                        outbuf, outlen, outlen_actual,
0886                        true, &raw_rc);
0887             if (delay_us < 100000)
0888                 delay_us <<= 1;
0889         } while ((rc == -EPROTO) &&
0890              (raw_rc == MC_CMD_ERR_NO_EVB_PORT) &&
0891              time_before(jiffies, abort_time));
0892     }
0893
0894     if (rc && !quiet && !(cmd == MC_CMD_REBOOT && rc == -EIO))
0895         efx_mcdi_display_error(efx, cmd, inlen,
0896                        outbuf, outlen, rc);
0897
0898     return rc;
0899 }
0900
0901 /**
0902  * efx_mcdi_rpc - Issue an MCDI command and wait for completion
0903  * @efx: NIC through which to issue the command
0904  * @cmd: Command type number
0905  * @inbuf: Command parameters
0906  * @inlen: Length of command parameters, in bytes.  Must be a multiple
0907  *  of 4 and no greater than %MCDI_CTL_SDU_LEN_MAX_V1.
0908  * @outbuf: Response buffer.  May be %NULL if @outlen is 0.
0909  * @outlen: Length of response buffer, in bytes.  If the actual
0910  *  response is longer than @outlen & ~3, it will be truncated
0911  *  to that length.
0912  * @outlen_actual: Pointer through which to return the actual response
0913  *  length.  May be %NULL if this is not needed.
0914  *
0915  * This function may sleep and therefore must be called in an appropriate
0916  * context.
0917  *
0918  * Return: A negative error code, or zero if successful.  The error
0919  *  code may come from the MCDI response or may indicate a failure
0920  *  to communicate with the MC.  In the former case, the response
0921  *  will still be copied to @outbuf and *@outlen_actual will be
0922  *  set accordingly.  In the latter case, *@outlen_actual will be
0923  *  set to zero.
0924  */
0925 int efx_mcdi_rpc(struct efx_nic *efx, unsigned cmd,
0926          const efx_dword_t *inbuf, size_t inlen,
0927          efx_dword_t *outbuf, size_t outlen,
0928          size_t *outlen_actual)
0929 {
0930     return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
0931                        outlen_actual, false);
0932 }
0933
0934 /* Normally, on receiving an error code in the MCDI response,
0935  * efx_mcdi_rpc will log an error message containing (among other
0936  * things) the raw error code, by means of efx_mcdi_display_error.
0937  * This _quiet version suppresses that; if the caller wishes to log
0938  * the error conditionally on the return code, it should call this
0939  * function and is then responsible for calling efx_mcdi_display_error
0940  * as needed.
0941  */
0942 int efx_mcdi_rpc_quiet(struct efx_nic *efx, unsigned cmd,
0943                const efx_dword_t *inbuf, size_t inlen,
0944                efx_dword_t *outbuf, size_t outlen,
0945                size_t *outlen_actual)
0946 {
0947     return _efx_mcdi_rpc_evb_retry(efx, cmd, inbuf, inlen, outbuf, outlen,
0948                        outlen_actual, true);
0949 }
0950
0951 int efx_mcdi_rpc_start(struct efx_nic *efx, unsigned cmd,
0952                const efx_dword_t *inbuf, size_t inlen)
0953 {
0954     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0955     int rc;
0956
0957     rc = efx_mcdi_check_supported(efx, cmd, inlen);
0958     if (rc)
0959         return rc;
0960
0961     if (efx->mc_bist_for_other_fn)
0962         return -ENETDOWN;
0963
0964     if (mcdi->mode == MCDI_MODE_FAIL)
0965         return -ENETDOWN;
0966
0967     efx_mcdi_acquire_sync(mcdi);
0968     efx_mcdi_send_request(efx, cmd, inbuf, inlen);
0969     return 0;
0970 }
0971
0972 static int _efx_mcdi_rpc_async(struct efx_nic *efx, unsigned int cmd,
0973                    const efx_dword_t *inbuf, size_t inlen,
0974                    size_t outlen,
0975                    efx_mcdi_async_completer *complete,
0976                    unsigned long cookie, bool quiet)
0977 {
0978     struct efx_mcdi_iface *mcdi = efx_mcdi(efx);
0979     struct efx_mcdi_async_param *async;
0980     int rc;
0981
0982     rc = efx_mcdi_check_supported(efx, cmd, inlen);
0983     if (rc)
0984         return rc;
0985
0986     if (efx->mc_bist_for_other_fn)
0987         return -ENETDOWN;
0988
0989     async = kmalloc(sizeof(*async) + ALIGN(max(inlen, outlen), 4),
0990             GFP_ATOMIC);
0991     if (!async)
0992         return -ENOMEM;
0993
0994     async->cmd = cmd;
0995     async->inlen = inlen;
0996     async->outlen = outlen;
0997     async->quiet = quiet;
0998     async->complete = complete;
0999     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  */
1046 int
1047 efx_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
1055 int 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
1064 int 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
1072 int 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
1080 void 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  */
1099 void 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  */
1130 void 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
1167 void 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
1194 static 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  */
1266 static 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  */
1290 static 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
1300 static 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 */
1309 void 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
1409 void 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
1447 fail:
1448     pci_err(efx->pci_dev, "%s: failed rc=%d\n", __func__, rc);
1449     buf[0] = 0;
1450 }
1451
1452 static 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
1515 fail:
1516     pci_err(efx->pci_dev, "%s: failed rc=%d\n", __func__, rc);
1517     return rc;
1518 }
1519
1520 int 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
1569 fail:
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
1576 int 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
1597 int 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
1617 fail:
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. */
1624 static 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
1647 fail:
1648     kfree(outbuf);
1649     return rc;
1650 }
1651
1652 int 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
1678 fail:
1679     netif_err(efx, hw, efx->net_dev, "%s: failed rc=%d\n", __func__, rc);
1680     return rc;
1681 }
1682
1683 static 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 */
1706 int 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
1733 fail:
1734     kfree(nvram_types);
1735     return rc;
1736 }
1737
1738 int 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
1761 fail2:
1762     netif_err(efx, hw, efx->net_dev, "%s: failed type=%u\n",
1763           __func__, type);
1764 fail1:
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  */
1772 static 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
1835 static 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
1859 int 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
1870 int 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
1885 static 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
1898 static 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
1915 enum reset_type efx_mcdi_map_reset_reason(enum reset_type reason)
1916 {
1917     return RESET_TYPE_RECOVER_OR_ALL;
1918 }
1919
1920 int 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
1950 static 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
1977 fail:
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
1985 int
1986 efx_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
1992 int 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
2012 fail:
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
2019 int 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
2031 int 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
2063 int 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
2071 int 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
2098 int 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
2123 fail:
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  */
2136 int 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
2182 static 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
2200 static 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
2224 static 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
2244 static 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
2261 static 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
2311 int 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     }
2330 out:
2331     *retlen = offset - start;
2332     return rc;
2333 }
2334
2335 int 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     }
2361 out:
2362     return rc;
2363 }
2364
2365 int 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     }
2391 out:
2392     *retlen = offset - start;
2393     return rc;
2394 }
2395
2396 int 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
2410 void 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 */