sfxge_mcdi.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010-2016 Solarflare Communications Inc.
    5  * All rights reserved.
    6  *
    7  * This software was developed in part by Philip Paeps under contract for
    8  * Solarflare Communications, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions are met:
   12  *
   13  * 1. Redistributions of source code must retain the above copyright notice,
   14  *    this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright notice,
   16  *    this list of conditions and the following disclaimer in the documentation
   17  *    and/or other materials provided with the distribution.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   20  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   21  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   22  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   23  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   24  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   25  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
   26  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
   27  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
   28  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
   29  * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  *
   31  * The views and conclusions contained in the software and documentation are
   32  * those of the authors and should not be interpreted as representing official
   33  * policies, either expressed or implied, of the FreeBSD Project.
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD$");
   38 
   39 #include <sys/param.h>
   40 #include <sys/condvar.h>
   41 #include <sys/lock.h>
   42 #include <sys/mutex.h>
   43 #include <sys/proc.h>
   44 #include <sys/syslog.h>
   45 #include <sys/taskqueue.h>
   46 #include <sys/malloc.h>
   47 
   48 #include "common/efx.h"
   49 #include "common/efx_mcdi.h"
   50 #include "common/efx_regs_mcdi.h"
   51 
   52 #include "sfxge.h"
   53 
   54 #if EFSYS_OPT_MCDI_LOGGING
   55 #include <dev/pci/pcivar.h>
   56 #endif
   57 
   58 #define SFXGE_MCDI_POLL_INTERVAL_MIN 10         /* 10us in 1us units */
   59 #define SFXGE_MCDI_POLL_INTERVAL_MAX 100000     /* 100ms in 1us units */
   60 
   61 static void
   62 sfxge_mcdi_timeout(struct sfxge_softc *sc)
   63 {
   64         device_t dev = sc->dev;
   65 
   66         log(LOG_WARNING, "[%s%d] MC_TIMEOUT", device_get_name(dev),
   67                 device_get_unit(dev));
   68 
   69         EFSYS_PROBE(mcdi_timeout);
   70         sfxge_schedule_reset(sc);
   71 }
   72 
   73 static void
   74 sfxge_mcdi_poll(struct sfxge_softc *sc, uint32_t timeout_us)
   75 {
   76         efx_nic_t *enp;
   77         clock_t delay_total;
   78         clock_t delay_us;
   79         boolean_t aborted __diagused;
   80 
   81         delay_total = 0;
   82         delay_us = SFXGE_MCDI_POLL_INTERVAL_MIN;
   83         enp = sc->enp;
   84 
   85         do {
   86                 if (efx_mcdi_request_poll(enp)) {
   87                         EFSYS_PROBE1(mcdi_delay, clock_t, delay_total);
   88                         return;
   89                 }
   90 
   91                 if (delay_total > timeout_us) {
   92                         aborted = efx_mcdi_request_abort(enp);
   93                         KASSERT(aborted, ("abort failed"));
   94                         sfxge_mcdi_timeout(sc);
   95                         return;
   96                 }
   97 
   98                 /* Spin or block depending on delay interval. */
   99                 if (delay_us < 1000000)
  100                         DELAY(delay_us);
  101                 else
  102                         pause("mcdi wait", delay_us * hz / 1000000);
  103 
  104                 delay_total += delay_us;
  105 
  106                 /* Exponentially back off the poll frequency. */
  107                 delay_us = delay_us * 2;
  108                 if (delay_us > SFXGE_MCDI_POLL_INTERVAL_MAX)
  109                         delay_us = SFXGE_MCDI_POLL_INTERVAL_MAX;
  110 
  111         } while (1);
  112 }
  113 
  114 static void
  115 sfxge_mcdi_execute(void *arg, efx_mcdi_req_t *emrp)
  116 {
  117         struct sfxge_softc *sc;
  118         struct sfxge_mcdi *mcdi;
  119         uint32_t timeout_us = 0;
  120 
  121         sc = (struct sfxge_softc *)arg;
  122         mcdi = &sc->mcdi;
  123 
  124         SFXGE_MCDI_LOCK(mcdi);
  125 
  126         KASSERT(mcdi->state == SFXGE_MCDI_INITIALIZED,
  127             ("MCDI not initialized"));
  128 
  129         /* Issue request and poll for completion. */
  130         efx_mcdi_get_timeout(sc->enp, emrp, &timeout_us);
  131         KASSERT(timeout_us > 0, ("MCDI timeout not initialized"));
  132 
  133         efx_mcdi_request_start(sc->enp, emrp, B_FALSE);
  134         sfxge_mcdi_poll(sc, timeout_us);
  135 
  136         SFXGE_MCDI_UNLOCK(mcdi);
  137 }
  138 
  139 static void
  140 sfxge_mcdi_ev_cpl(void *arg)
  141 {
  142         struct sfxge_softc *sc;
  143         struct sfxge_mcdi *mcdi __diagused;
  144 
  145         sc = (struct sfxge_softc *)arg;
  146         mcdi = &sc->mcdi;
  147 
  148         KASSERT(mcdi->state == SFXGE_MCDI_INITIALIZED,
  149             ("MCDI not initialized"));
  150 
  151         /* We do not use MCDI completion, MCDI is simply polled */
  152 }
  153 
  154 static void
  155 sfxge_mcdi_exception(void *arg, efx_mcdi_exception_t eme)
  156 {
  157         struct sfxge_softc *sc;
  158         device_t dev;
  159 
  160         sc = (struct sfxge_softc *)arg;
  161         dev = sc->dev;
  162 
  163         log(LOG_WARNING, "[%s%d] MC_%s", device_get_name(dev),
  164             device_get_unit(dev),
  165             (eme == EFX_MCDI_EXCEPTION_MC_REBOOT)
  166             ? "REBOOT"
  167             : (eme == EFX_MCDI_EXCEPTION_MC_BADASSERT)
  168             ? "BADASSERT" : "UNKNOWN");
  169 
  170         EFSYS_PROBE(mcdi_exception);
  171 
  172         sfxge_schedule_reset(sc);
  173 }
  174 
  175 #if EFSYS_OPT_MCDI_LOGGING
  176 
  177 #define SFXGE_MCDI_LOG_BUF_SIZE 128
  178 
  179 static size_t
  180 sfxge_mcdi_do_log(char *buffer, void *data, size_t data_size,
  181                   size_t pfxsize, size_t position)
  182 {
  183         uint32_t *words = data;
  184         size_t i;
  185 
  186         for (i = 0; i < data_size; i += sizeof(*words)) {
  187                 if (position + 2 * sizeof(*words) + 1 >= SFXGE_MCDI_LOG_BUF_SIZE) {
  188                         buffer[position] = '\0';
  189                         printf("%s \\\n", buffer);
  190                         position = pfxsize;
  191                 }
  192                 snprintf(buffer + position, SFXGE_MCDI_LOG_BUF_SIZE - position,
  193                          " %08x", *words);
  194                 words++;
  195                 position += 2 * sizeof(uint32_t) + 1;
  196         }
  197         return (position);
  198 }
  199 
  200 static void
  201 sfxge_mcdi_logger(void *arg, efx_log_msg_t type,
  202                   void *header, size_t header_size,
  203                   void *data, size_t data_size)
  204 {
  205         struct sfxge_softc *sc = (struct sfxge_softc *)arg;
  206         char buffer[SFXGE_MCDI_LOG_BUF_SIZE];
  207         size_t pfxsize;
  208         size_t start;
  209 
  210         if (!sc->mcdi_logging)
  211                 return;
  212 
  213         pfxsize = snprintf(buffer, sizeof(buffer),
  214                            "sfc %04x:%02x:%02x.%02x %s MCDI RPC %s:",
  215                            pci_get_domain(sc->dev),
  216                            pci_get_bus(sc->dev),
  217                            pci_get_slot(sc->dev),
  218                            pci_get_function(sc->dev),
  219                            device_get_nameunit(sc->dev),
  220                            type == EFX_LOG_MCDI_REQUEST ? "REQ" :
  221                            type == EFX_LOG_MCDI_RESPONSE ? "RESP" : "???");
  222         start = sfxge_mcdi_do_log(buffer, header, header_size,
  223                                   pfxsize, pfxsize);
  224         start = sfxge_mcdi_do_log(buffer, data, data_size, pfxsize, start);
  225         if (start != pfxsize) {
  226                 buffer[start] = '\0';
  227                 printf("%s\n", buffer);
  228         }
  229 }
  230 
  231 #endif
  232 
  233 int
  234 sfxge_mcdi_ioctl(struct sfxge_softc *sc, sfxge_ioc_t *ip)
  235 {
  236         const efx_nic_cfg_t *encp = efx_nic_cfg_get(sc->enp);
  237         struct sfxge_mcdi *mp = &(sc->mcdi);
  238         efx_mcdi_req_t emr;
  239         uint8_t *mcdibuf;
  240         int rc;
  241 
  242         if (mp->state == SFXGE_MCDI_UNINITIALIZED) {
  243                 rc = ENODEV;
  244                 goto fail1;
  245         }
  246 
  247         if (!(encp->enc_features & EFX_FEATURE_MCDI)) {
  248                 rc = ENOTSUP;
  249                 goto fail2;
  250         }
  251 
  252         if (ip->u.mcdi.len > SFXGE_MCDI_MAX_PAYLOAD) {
  253                 rc = EINVAL;
  254                 goto fail3;
  255         }
  256 
  257         mcdibuf = malloc(SFXGE_MCDI_MAX_PAYLOAD, M_TEMP, M_WAITOK | M_ZERO);
  258         if ((rc = copyin(ip->u.mcdi.payload, mcdibuf, ip->u.mcdi.len)) != 0) {
  259                 goto fail5;
  260         }
  261 
  262         emr.emr_cmd = ip->u.mcdi.cmd;
  263         emr.emr_in_buf = mcdibuf;
  264         emr.emr_in_length = ip->u.mcdi.len;
  265 
  266         emr.emr_out_buf = mcdibuf;
  267         emr.emr_out_length = SFXGE_MCDI_MAX_PAYLOAD;
  268 
  269         sfxge_mcdi_execute(sc, &emr);
  270 
  271         ip->u.mcdi.rc = emr.emr_rc;
  272         ip->u.mcdi.cmd = emr.emr_cmd;
  273         ip->u.mcdi.len = emr.emr_out_length_used;
  274         if ((rc = copyout(mcdibuf, ip->u.mcdi.payload, ip->u.mcdi.len)) != 0) {
  275                 goto fail6;
  276         }
  277 
  278         /*
  279          * Helpfully trigger a device reset in response to an MCDI_CMD_REBOOT
  280          * Both ports will see ->emt_exception callbacks on the next MCDI poll
  281          */
  282         if (ip->u.mcdi.cmd == MC_CMD_REBOOT) {
  283                 EFSYS_PROBE(mcdi_ioctl_mc_reboot);
  284                 /* sfxge_t->s_state_lock held */
  285                 (void) sfxge_schedule_reset(sc);
  286         }
  287 
  288         free(mcdibuf, M_TEMP);
  289 
  290         return (0);
  291 
  292 fail6:
  293 fail5:
  294         free(mcdibuf, M_TEMP);
  295 fail3:
  296 fail2:
  297 fail1:
  298         return (rc);
  299 }
  300 
  301 int
  302 sfxge_mcdi_init(struct sfxge_softc *sc)
  303 {
  304         efx_nic_t *enp;
  305         struct sfxge_mcdi *mcdi;
  306         efx_mcdi_transport_t *emtp;
  307         efsys_mem_t *esmp;
  308         int max_msg_size;
  309         int rc;
  310 
  311         enp = sc->enp;
  312         mcdi = &sc->mcdi;
  313         emtp = &mcdi->transport;
  314         esmp = &mcdi->mem;
  315         max_msg_size = sizeof (uint32_t) + MCDI_CTL_SDU_LEN_MAX_V2;
  316 
  317         KASSERT(mcdi->state == SFXGE_MCDI_UNINITIALIZED,
  318             ("MCDI already initialized"));
  319 
  320         SFXGE_MCDI_LOCK_INIT(mcdi, device_get_nameunit(sc->dev));
  321 
  322         mcdi->state = SFXGE_MCDI_INITIALIZED;
  323 
  324         if ((rc = sfxge_dma_alloc(sc, max_msg_size, esmp)) != 0)
  325                 goto fail;
  326 
  327         emtp->emt_context = sc;
  328         emtp->emt_dma_mem = esmp;
  329         emtp->emt_execute = sfxge_mcdi_execute;
  330         emtp->emt_ev_cpl = sfxge_mcdi_ev_cpl;
  331         emtp->emt_exception = sfxge_mcdi_exception;
  332 #if EFSYS_OPT_MCDI_LOGGING
  333         emtp->emt_logger = sfxge_mcdi_logger;
  334         SYSCTL_ADD_INT(device_get_sysctl_ctx(sc->dev),
  335                        SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),
  336                        OID_AUTO, "mcdi_logging", CTLFLAG_RW,
  337                        &sc->mcdi_logging, 0,
  338                        "MCDI logging");
  339 #endif
  340 
  341         if ((rc = efx_mcdi_init(enp, emtp)) != 0)
  342                 goto fail;
  343 
  344         return (0);
  345 
  346 fail:
  347         SFXGE_MCDI_LOCK_DESTROY(mcdi);
  348         mcdi->state = SFXGE_MCDI_UNINITIALIZED;
  349         return (rc);
  350 }
  351 
  352 void
  353 sfxge_mcdi_fini(struct sfxge_softc *sc)
  354 {
  355         struct sfxge_mcdi *mcdi;
  356         efx_nic_t *enp;
  357         efx_mcdi_transport_t *emtp;
  358         efsys_mem_t *esmp;
  359 
  360         enp = sc->enp;
  361         mcdi = &sc->mcdi;
  362         emtp = &mcdi->transport;
  363         esmp = &mcdi->mem;
  364 
  365         SFXGE_MCDI_LOCK(mcdi);
  366         KASSERT(mcdi->state == SFXGE_MCDI_INITIALIZED,
  367             ("MCDI not initialized"));
  368 
  369         efx_mcdi_fini(enp);
  370         bzero(emtp, sizeof(*emtp));
  371 
  372         SFXGE_MCDI_UNLOCK(mcdi);
  373 
  374         sfxge_dma_free(esmp);
  375 
  376         SFXGE_MCDI_LOCK_DESTROY(mcdi);
  377 }
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sys/dev/sfxge/sfxge_mcdi.c
