diff options
Diffstat (limited to 'drivers/net/ethernet/sfc/mcdi.c')
| -rw-r--r-- | drivers/net/ethernet/sfc/mcdi.c | 1891 |
1 files changed, 1891 insertions, 0 deletions
diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c new file mode 100644 index 00000000000..5239cf9bdc5 --- /dev/null +++ b/drivers/net/ethernet/sfc/mcdi.c @@ -0,0 +1,1891 @@ +/**************************************************************************** + * 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; + bool quiet; + 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 void efx_mcdi_abandon(struct efx_nic *efx); + +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"); + + if (efx->mcdi->fn_flags & + (1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY)) + efx->primary = efx; + + 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_ENOTSUP: + return -EOPNOTSUPP; + 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, err_len; + efx_dword_t *outbuf; + MCDI_DECLARE_BUF_OUT_OR_ERR(errbuf, 0); + 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)); + if (!timeout && rc && !async->quiet) { + err_len = min(sizeof(errbuf), data_len); + efx->type->mcdi_read_response(efx, errbuf, hdr_len, + sizeof(errbuf)); + efx_mcdi_display_error(efx, async->cmd, async->inlen, errbuf, + err_len, rc); + } + 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; +} + +static 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, bool quiet) +{ + struct efx_mcdi_iface *mcdi = efx_mcdi(efx); + MCDI_DECLARE_BUF_OUT_OR_ERR(errbuf, 0); + 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; + } + + efx_mcdi_abandon(efx); + + /* 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) { + if (outlen_actual) + *outlen_actual = 0; + } else { + size_t hdr_len, data_len, err_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; + err_len = min(sizeof(errbuf), data_len); + spin_unlock_bh(&mcdi->iface_lock); + + BUG_ON(rc > 0); + + efx->type->mcdi_read_response(efx, outbuf, hdr_len, + min(outlen, data_len)); + if (outlen_actual) + *outlen_actual = data_len; + + efx->type->mcdi_read_response(efx, errbuf, hdr_len, err_len); + + 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 if (rc && !quiet) { + efx_mcdi_display_error(efx, cmd, inlen, errbuf, err_len, + 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; +} + +static 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, bool quiet) +{ + int rc; + + rc = efx_mcdi_rpc_start(efx, cmd, inbuf, inlen); + if (rc) { + if (outlen_actual) + *outlen_actual = 0; + return rc; + } + return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen, + outlen_actual, quiet); +} + +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) +{ + return _efx_mcdi_rpc(efx, cmd, inbuf, inlen, outbuf, outlen, + outlen_actual, false); +} + +/* Normally, on receiving an error code in the MCDI response, + * efx_mcdi_rpc will log an error message containing (among other + * things) the raw error code, by means of efx_mcdi_display_error. + * This _quiet version suppresses that; if the caller wishes to log + * the error conditionally on the return code, it should call this + * function and is then responsible for calling efx_mcdi_display_error + * as needed. + */ +int efx_mcdi_rpc_quiet(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) +{ + return _efx_mcdi_rpc(efx, cmd, inbuf, inlen, outbuf, outlen, + outlen_actual, true); +} + +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; + + if (efx->mc_bist_for_other_fn) + return -ENETDOWN; + + if (mcdi->mode == MCDI_MODE_FAIL) + return -ENETDOWN; + + efx_mcdi_acquire_sync(mcdi); + efx_mcdi_send_request(efx, cmd, inbuf, inlen); + return 0; +} + +static 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, bool quiet) +{ + 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; + + if (efx->mc_bist_for_other_fn) + return -ENETDOWN; + + 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->quiet = quiet; + 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; +} + +/** + * 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) +{ + return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete, + cookie, false); +} + +int efx_mcdi_rpc_async_quiet(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) +{ + return _efx_mcdi_rpc_async(efx, cmd, inbuf, inlen, outlen, complete, + cookie, true); +} + +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) +{ + return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen, + outlen_actual, false); +} + +int efx_mcdi_rpc_finish_quiet(struct efx_nic *efx, unsigned cmd, size_t inlen, + efx_dword_t *outbuf, size_t outlen, + size_t *outlen_actual) +{ + return _efx_mcdi_rpc_finish(efx, cmd, inlen, outbuf, outlen, + outlen_actual, true); +} + +void efx_mcdi_display_error(struct efx_nic *efx, unsigned cmd, + size_t inlen, efx_dword_t *outbuf, + size_t outlen, int rc) +{ + int code = 0, err_arg = 0; + + if (outlen >= MC_CMD_ERR_CODE_OFST + 4) + code = MCDI_DWORD(outbuf, ERR_CODE); + if (outlen >= MC_CMD_ERR_ARG_OFST + 4) + err_arg = MCDI_DWORD(outbuf, ERR_ARG); + netif_err(efx, hw, efx->net_dev, + "MC command 0x%x inlen %d failed rc=%d (raw=%d) arg=%d\n", + cmd, (int)inlen, rc, code, err_arg); +} + +/* 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 already in polling mode, nothing to do. + * If in fail-fast state, don't switch to polled completion. + * FLR recovery will do that later. + */ + if (mcdi->mode == MCDI_MODE_POLL || mcdi->mode == MCDI_MODE_FAIL) + 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 poll or fail mode so no more requests can be queued */ + BUG_ON(mcdi->mode == MCDI_MODE_EVENTS); + + 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 already in event completion mode, nothing to do. + * If in fail-fast state, don't switch to event completion. FLR + * recovery will do that later. + */ + if (mcdi->mode == MCDI_MODE_EVENTS || mcdi->mode == MCDI_MODE_FAIL) + 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); +} + +/* The MC is going down in to BIST mode. set the BIST flag to block + * new MCDI, cancel any outstanding MCDI and and schedule a BIST-type reset + * (which doesn't actually execute a reset, it waits for the controlling + * function to reset it). + */ +static void efx_mcdi_ev_bist(struct efx_nic *efx) +{ + struct efx_mcdi_iface *mcdi = efx_mcdi(efx); + + spin_lock(&mcdi->iface_lock); + efx->mc_bist_for_other_fn = true; + if (efx_mcdi_complete_sync(mcdi)) { + if (mcdi->mode == MCDI_MODE_EVENTS) { + mcdi->resprc = -EIO; + mcdi->resp_hdr_len = 0; + mcdi->resp_data_len = 0; + ++mcdi->credits; + } + } + mcdi->new_epoch = true; + efx_schedule_reset(efx, RESET_TYPE_MC_BIST); + spin_unlock(&mcdi->iface_lock); +} + +/* MCDI timeouts seen, so make all MCDI calls fail-fast and issue an FLR to try + * to recover. + */ +static void efx_mcdi_abandon(struct efx_nic *efx) +{ + struct efx_mcdi_iface *mcdi = efx_mcdi(efx); + + if (xchg(&mcdi->mode, MCDI_MODE_FAIL) == MCDI_MODE_FAIL) + return; /* it had already been done */ + netif_dbg(efx, hw, efx->net_dev, "MCDI is timing out; trying to recover\n"); + efx_schedule_reset(efx, RESET_TYPE_MCDI_TIMEOUT); +} + +/* 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_dbg(efx, hw, efx->net_dev, + "MC Scheduler alert (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_MC_BIST: + netif_info(efx, hw, efx->net_dev, "MC entered BIST mode\n"); + efx_mcdi_ev_bist(efx); + 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_PTP_TIME: + efx_time_sync_event(channel, 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; + } + + if (driver_operating) { + if (outlen >= MC_CMD_DRV_ATTACH_EXT_OUT_LEN) { + efx->mcdi->fn_flags = + MCDI_DWORD(outbuf, + DRV_ATTACH_EXT_OUT_FUNC_FLAGS); + } else { + /* Synthesise flags for Siena */ + efx->mcdi->fn_flags = + 1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_LINKCTRL | + 1 << MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_TRUSTED | + (efx_port_num(efx) == 0) << + MC_CMD_DRV_ATTACH_EXT_OUT_FLAG_PRIMARY; + } + } + + /* 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 && + (efx->mcdi->fn_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); + /* we need __aligned(2) for ether_addr_copy */ + BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT0_OFST & 1); + BUILD_BUG_ON(MC_CMD_GET_BOARD_CFG_OUT_MAC_ADDR_BASE_PORT1_OFST & 1); + + 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) + ether_addr_copy(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)); + 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); + 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_OUT_OR_ERR(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_quiet(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) { + efx_mcdi_display_error(efx, MC_CMD_GET_ASSERTS, + MC_CMD_GET_ASSERTS_IN_LEN, outbuf, + outlen, 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); +} + +static int efx_mcdi_reset_func(struct efx_nic *efx) +{ + MCDI_DECLARE_BUF(inbuf, MC_CMD_ENTITY_RESET_IN_LEN); + int rc; + + BUILD_BUG_ON(MC_CMD_ENTITY_RESET_OUT_LEN != 0); + MCDI_POPULATE_DWORD_1(inbuf, ENTITY_RESET_IN_FLAG, + ENTITY_RESET_IN_FUNCTION_RESOURCE_RESET, 1); + rc = efx_mcdi_rpc(efx, MC_CMD_ENTITY_RESET, inbuf, sizeof(inbuf), + NULL, 0, NULL); + 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; + 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; + + /* If MCDI is down, we can't handle_assertion */ + if (method == RESET_TYPE_MCDI_TIMEOUT) { + rc = pci_reset_function(efx->pci_dev); + if (rc) + return rc; + /* Re-enable polled MCDI completion */ + if (efx->mcdi) { + struct efx_mcdi_iface *mcdi = efx_mcdi(efx); + mcdi->mode = MCDI_MODE_POLL; + } + return 0; + } + + /* 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_func(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); + ether_addr_copy(MCDI_PTR(inbuf, WOL_FILTER_SET_IN_MAGIC_MAC), mac); + + 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); + 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); + 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); + 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) + return rc; + + memcpy(buffer, MCDI_PTR(outbuf, NVRAM_READ_OUT_READ_BUFFER), length); + return 0; +} + +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); + 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); + 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); + 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 */ |