FreeBSD/Linux Kernel Cross Reference
sys/dev/iwm/if_iwm_util.c

     /*      $OpenBSD: if_iwm.c,v 1.39 2015/03/23 00:35:19 jsg Exp $ */
     
     /*
      * Copyright (c) 2014 genua mbh <info@genua.de>
      * Copyright (c) 2014 Fixup Software Ltd.
      *
      * Permission to use, copy, modify, and distribute this software for any
      * purpose with or without fee is hereby granted, provided that the above
      * copyright notice and this permission notice appear in all copies.
     *
     * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    /*-
     * Based on BSD-licensed source modules in the Linux iwlwifi driver,
     * which were used as the reference documentation for this implementation.
     *
     * Driver version we are currently based off of is
     * Linux 3.14.3 (tag id a2df521e42b1d9a23f620ac79dbfe8655a8391dd)
     *
     ***********************************************************************
     *
     * This file is provided under a dual BSD/GPLv2 license.  When using or
     * redistributing this file, you may do so under either license.
     *
     * GPL LICENSE SUMMARY
     *
     * Copyright(c) 2007 - 2013 Intel Corporation. All rights reserved.
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of version 2 of the GNU General Public License as
     * published by the Free Software Foundation.
     *
     * This program is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     * General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program; if not, write to the Free Software
     * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
     * USA
     *
     * The full GNU General Public License is included in this distribution
     * in the file called COPYING.
     *
     * Contact Information:
     *  Intel Linux Wireless <ilw@linux.intel.com>
     * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
     *
     *
     * BSD LICENSE
     *
     * Copyright(c) 2005 - 2013 Intel Corporation. All rights reserved.
     * All rights reserved.
     *
     * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     *
     *  * Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     *  * Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in
     *    the documentation and/or other materials provided with the
     *    distribution.
     *  * Neither the name Intel Corporation nor the names of its
     *    contributors may be used to endorse or promote products derived
     *    from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    /*-
     * Copyright (c) 2007-2010 Damien Bergamini <damien.bergamini@free.fr>
     *
     * Permission to use, copy, modify, and distribute this software for any
     * purpose with or without fee is hereby granted, provided that the above
     * copyright notice and this permission notice appear in all copies.
     *
     * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
    * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
    * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
    * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
    * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
    */
   #include <sys/cdefs.h>
   __FBSDID("$FreeBSD$");
   
   #include "opt_wlan.h"
   #include "opt_iwm.h"
   
   #include <sys/param.h>
   #include <sys/bus.h>
   #include <sys/conf.h>
   #include <sys/endian.h>
   #include <sys/firmware.h>
   #include <sys/kernel.h>
   #include <sys/malloc.h>
   #include <sys/mbuf.h>
   #include <sys/mutex.h>
   #include <sys/module.h>
   #include <sys/proc.h>
   #include <sys/rman.h>
   #include <sys/socket.h>
   #include <sys/sockio.h>
   #include <sys/sysctl.h>
   #include <sys/linker.h>
   
   #include <machine/bus.h>
   #include <machine/endian.h>
   #include <machine/resource.h>
   
   #include <dev/pci/pcivar.h>
   #include <dev/pci/pcireg.h>
   
   #include <net/bpf.h>
   
   #include <net/if.h>
   #include <net/if_var.h>
   #include <net/if_arp.h>
   #include <net/if_dl.h>
   #include <net/if_media.h>
   #include <net/if_types.h>
   
   #include <netinet/in.h>
   #include <netinet/in_systm.h>
   #include <netinet/if_ether.h>
   #include <netinet/ip.h>
   
   #include <net80211/ieee80211_var.h>
   #include <net80211/ieee80211_regdomain.h>
   #include <net80211/ieee80211_ratectl.h>
   #include <net80211/ieee80211_radiotap.h>
   
   #include <dev/iwm/if_iwmreg.h>
   #include <dev/iwm/if_iwmvar.h>
   #include <dev/iwm/if_iwm_config.h>
   #include <dev/iwm/if_iwm_debug.h>
   #include <dev/iwm/if_iwm_binding.h>
   #include <dev/iwm/if_iwm_util.h>
   #include <dev/iwm/if_iwm_pcie_trans.h>
   
   /*
    * Send a command to the firmware.  We try to implement the Linux
    * driver interface for the routine.
    * mostly from if_iwn (iwn_cmd()).
    *
    * For now, we always copy the first part and map the second one (if it exists).
    */
   int
   iwm_send_cmd(struct iwm_softc *sc, struct iwm_host_cmd *hcmd)
   {
           struct iwm_tx_ring *ring = &sc->txq[IWM_CMD_QUEUE];
           struct iwm_tfd *desc;
           struct iwm_tx_data *txdata = NULL;
           struct iwm_device_cmd *cmd;
           struct mbuf *m;
           bus_dma_segment_t seg;
           bus_addr_t paddr;
           uint32_t addr_lo;
           int error = 0, i, paylen, off;
           int code;
           int async, wantresp;
           int group_id;
           int nsegs;
           size_t hdrlen, datasz;
           uint8_t *data;
   
           code = hcmd->id;
           async = hcmd->flags & IWM_CMD_ASYNC;
           wantresp = hcmd->flags & IWM_CMD_WANT_SKB;
           data = NULL;
   
           for (i = 0, paylen = 0; i < nitems(hcmd->len); i++) {
                   paylen += hcmd->len[i];
           }
   
           /* if the command wants an answer, busy sc_cmd_resp */
           if (wantresp) {
                   KASSERT(!async, ("invalid async parameter"));
                   while (sc->sc_wantresp != -1)
                           msleep(&sc->sc_wantresp, &sc->sc_mtx, 0, "iwmcmdsl", 0);
                   sc->sc_wantresp = ring->qid << 16 | ring->cur;
                   IWM_DPRINTF(sc, IWM_DEBUG_CMD,
                       "wantresp is %x\n", sc->sc_wantresp);
           }
   
           /*
            * Is the hardware still available?  (after e.g. above wait).
            */
           if (sc->sc_flags & IWM_FLAG_STOPPED) {
                   error = ENXIO;
                   goto out;
           }
   
           desc = &ring->desc[ring->cur];
           txdata = &ring->data[ring->cur];
   
           group_id = iwm_cmd_groupid(code);
           if (group_id != 0) {
                   hdrlen = sizeof(cmd->hdr_wide);
                   datasz = sizeof(cmd->data_wide);
           } else {
                   hdrlen = sizeof(cmd->hdr);
                   datasz = sizeof(cmd->data);
           }
   
           if (paylen > datasz) {
                   IWM_DPRINTF(sc, IWM_DEBUG_CMD,
                       "large command paylen=%u len0=%u\n",
                           paylen, hcmd->len[0]);
                   /* Command is too large */
                   size_t totlen = hdrlen + paylen;
                   if (paylen > IWM_MAX_CMD_PAYLOAD_SIZE) {
                           device_printf(sc->sc_dev,
                               "firmware command too long (%zd bytes)\n",
                               totlen);
                           error = EINVAL;
                           goto out;
                   }
                   m = m_getjcl(M_NOWAIT, MT_DATA, M_PKTHDR, IWM_RBUF_SIZE);
                   if (m == NULL) {
                           error = ENOBUFS;
                           goto out;
                   }
   
                   m->m_len = m->m_pkthdr.len = m->m_ext.ext_size;
                   error = bus_dmamap_load_mbuf_sg(ring->data_dmat,
                       txdata->map, m, &seg, &nsegs, BUS_DMA_NOWAIT);
                   if (error != 0) {
                           device_printf(sc->sc_dev,
                               "%s: can't map mbuf, error %d\n", __func__, error);
                           m_freem(m);
                           goto out;
                   }
                   txdata->m = m; /* mbuf will be freed in iwm_cmd_done() */
                   cmd = mtod(m, struct iwm_device_cmd *);
                   paddr = seg.ds_addr;
           } else {
                   cmd = &ring->cmd[ring->cur];
                   paddr = txdata->cmd_paddr;
           }
   
           if (group_id != 0) {
                   cmd->hdr_wide.opcode = iwm_cmd_opcode(code);
                   cmd->hdr_wide.group_id = group_id;
                   cmd->hdr_wide.qid = ring->qid;
                   cmd->hdr_wide.idx = ring->cur;
                   cmd->hdr_wide.length = htole16(paylen);
                   cmd->hdr_wide.version = iwm_cmd_version(code);
                   data = cmd->data_wide;
           } else {
                   cmd->hdr.code = iwm_cmd_opcode(code);
                   cmd->hdr.flags = 0;
                   cmd->hdr.qid = ring->qid;
                   cmd->hdr.idx = ring->cur;
                   data = cmd->data;
           }
   
           for (i = 0, off = 0; i < nitems(hcmd->data); i++) {
                   if (hcmd->len[i] == 0)
                           continue;
                   memcpy(data + off, hcmd->data[i], hcmd->len[i]);
                   off += hcmd->len[i];
           }
           KASSERT(off == paylen, ("off %d != paylen %d", off, paylen));
   
           /* lo field is not aligned */
           addr_lo = htole32((uint32_t)paddr);
           memcpy(&desc->tbs[0].lo, &addr_lo, sizeof(uint32_t));
           desc->tbs[0].hi_n_len  = htole16(iwm_get_dma_hi_addr(paddr)
               | ((hdrlen + paylen) << 4));
           desc->num_tbs = 1;
   
           IWM_DPRINTF(sc, IWM_DEBUG_CMD,
               "iwm_send_cmd 0x%x size=%lu %s\n",
               code,
               (unsigned long) (hcmd->len[0] + hcmd->len[1] + hdrlen),
               async ? " (async)" : "");
   
           if (paylen > datasz) {
                   bus_dmamap_sync(ring->data_dmat, txdata->map,
                       BUS_DMASYNC_PREWRITE);
           } else {
                   bus_dmamap_sync(ring->cmd_dma.tag, ring->cmd_dma.map,
                       BUS_DMASYNC_PREWRITE);
           }
           bus_dmamap_sync(ring->desc_dma.tag, ring->desc_dma.map,
               BUS_DMASYNC_PREWRITE);
   
           error = iwm_pcie_set_cmd_in_flight(sc);
           if (error)
                   goto out;
           ring->queued++;
   
   #if 0
           iwm_update_sched(sc, ring->qid, ring->cur, 0, 0);
   #endif
           IWM_DPRINTF(sc, IWM_DEBUG_CMD,
               "sending command 0x%x qid %d, idx %d\n",
               code, ring->qid, ring->cur);
   
           /* Kick command ring. */
           ring->cur = (ring->cur + 1) % IWM_TX_RING_COUNT;
           IWM_WRITE(sc, IWM_HBUS_TARG_WRPTR, ring->qid << 8 | ring->cur);
   
           if (!async) {
                   /* m..m-mmyy-mmyyyy-mym-ym m-my generation */
                   int generation = sc->sc_generation;
                   error = msleep(desc, &sc->sc_mtx, PCATCH, "iwmcmd", hz);
                   if (error == 0) {
                           /* if hardware is no longer up, return error */
                           if (generation != sc->sc_generation) {
                                   error = ENXIO;
                           } else {
                                   hcmd->resp_pkt = (void *)sc->sc_cmd_resp;
                           }
                   }
           }
    out:
           if (wantresp && error != 0) {
                   iwm_free_resp(sc, hcmd);
           }
   
           return error;
   }
   
   /* iwlwifi: mvm/utils.c */
   int
   iwm_send_cmd_pdu(struct iwm_softc *sc, uint32_t id,
           uint32_t flags, uint16_t len, const void *data)
   {
           struct iwm_host_cmd cmd = {
                   .id = id,
                   .len = { len, },
                   .data = { data, },
                   .flags = flags,
           };
   
           return iwm_send_cmd(sc, &cmd);
   }
   
   /* iwlwifi: mvm/utils.c */
   int
   iwm_send_cmd_status(struct iwm_softc *sc,
           struct iwm_host_cmd *cmd, uint32_t *status)
   {
           struct iwm_rx_packet *pkt;
           struct iwm_cmd_response *resp;
           int error, resp_len;
   
           KASSERT((cmd->flags & IWM_CMD_WANT_SKB) == 0,
               ("invalid command"));
           cmd->flags |= IWM_CMD_SYNC | IWM_CMD_WANT_SKB;
   
           if ((error = iwm_send_cmd(sc, cmd)) != 0)
                   return error;
           pkt = cmd->resp_pkt;
   
           /* Can happen if RFKILL is asserted */
           if (!pkt) {
                   error = 0;
                   goto out_free_resp;
           }
   
           if (pkt->hdr.flags & IWM_CMD_FAILED_MSK) {
                   error = EIO;
                   goto out_free_resp;
           }
   
           resp_len = iwm_rx_packet_payload_len(pkt);
           if (resp_len != sizeof(*resp)) {
                   error = EIO;
                   goto out_free_resp;
           }
   
           resp = (void *)pkt->data;
           *status = le32toh(resp->status);
    out_free_resp:
           iwm_free_resp(sc, cmd);
           return error;
   }
   
   /* iwlwifi/mvm/utils.c */
   int
   iwm_send_cmd_pdu_status(struct iwm_softc *sc, uint32_t id,
           uint16_t len, const void *data, uint32_t *status)
   {
           struct iwm_host_cmd cmd = {
                   .id = id,
                   .len = { len, },
                   .data = { data, },
           };
   
           return iwm_send_cmd_status(sc, &cmd, status);
   }
   
   void
   iwm_free_resp(struct iwm_softc *sc, struct iwm_host_cmd *hcmd)
   {
           KASSERT(sc->sc_wantresp != -1, ("already freed"));
           KASSERT((hcmd->flags & (IWM_CMD_WANT_SKB|IWM_CMD_SYNC))
               == (IWM_CMD_WANT_SKB|IWM_CMD_SYNC), ("invalid flags"));
           sc->sc_wantresp = -1;
           wakeup(&sc->sc_wantresp);
   }
   
   static void
   iwm_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
   {
           if (error != 0)
                   return;
           KASSERT(nsegs == 1, ("too many DMA segments, %d should be 1", nsegs));
           *(bus_addr_t *)arg = segs[0].ds_addr;
   }
   
   int
   iwm_dma_contig_alloc(bus_dma_tag_t tag, struct iwm_dma_info *dma,
       bus_size_t size, bus_size_t alignment)
   {
           int error;
   
           dma->tag = NULL;
           dma->map = NULL;
           dma->size = size;
           dma->vaddr = NULL;
   
           error = bus_dma_tag_create(tag, alignment,
               0, BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL, size,
               1, size, 0, NULL, NULL, &dma->tag);
           if (error != 0)
                   goto fail;
   
           error = bus_dmamem_alloc(dma->tag, (void **)&dma->vaddr,
               BUS_DMA_NOWAIT | BUS_DMA_ZERO | BUS_DMA_COHERENT, &dma->map);
           if (error != 0)
                   goto fail;
   
           error = bus_dmamap_load(dma->tag, dma->map, dma->vaddr, size,
               iwm_dma_map_addr, &dma->paddr, BUS_DMA_NOWAIT);
           if (error != 0) {
                   bus_dmamem_free(dma->tag, dma->vaddr, dma->map);
                   dma->vaddr = NULL;
                   goto fail;
           }
   
           bus_dmamap_sync(dma->tag, dma->map, BUS_DMASYNC_PREWRITE);
   
           return 0;
   
   fail:
           iwm_dma_contig_free(dma);
   
           return error;
   }
   
   void
   iwm_dma_contig_free(struct iwm_dma_info *dma)
   {
           if (dma->vaddr != NULL) {
                   bus_dmamap_sync(dma->tag, dma->map,
                       BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
                   bus_dmamap_unload(dma->tag, dma->map);
                   bus_dmamem_free(dma->tag, dma->vaddr, dma->map);
                   dma->vaddr = NULL;
           }
           if (dma->tag != NULL) {
                   bus_dma_tag_destroy(dma->tag);
                   dma->tag = NULL;
           }
   }
   
   /**
    * iwm_send_lq_cmd() - Send link quality command
    * @init: This command is sent as part of station initialization right
    *        after station has been added.
    *
    * The link quality command is sent as the last step of station creation.
    * This is the special case in which init is set and we call a callback in
    * this case to clear the state indicating that station creation is in
    * progress.
    */
   int
   iwm_send_lq_cmd(struct iwm_softc *sc, struct iwm_lq_cmd *lq, boolean_t init)
   {
           struct iwm_host_cmd cmd = {
                   .id = IWM_LQ_CMD,
                   .len = { sizeof(struct iwm_lq_cmd), },
                   .flags = init ? 0 : IWM_CMD_ASYNC,
                   .data = { lq, },
           };
   
           if (lq->sta_id == IWM_STATION_COUNT)
                   return EINVAL;
   
           return iwm_send_cmd(sc, &cmd);
   }
   
   boolean_t
   iwm_rx_diversity_allowed(struct iwm_softc *sc)
   {
           if (num_of_ant(iwm_get_valid_rx_ant(sc)) == 1)
                   return FALSE;
   
           /*
            * XXX Also return FALSE when SMPS (Spatial Multiplexing Powersave)
            *     is used on any vap (in the future).
            */
   
           return TRUE;
   }

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