drivers/staging/rdma/hfi1/intr.c

   1 /*
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2015 Intel Corporation.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of version 2 of the GNU General Public License as
  12  * published by the Free Software Foundation.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * BSD LICENSE
  20  *
  21  * Copyright(c) 2015 Intel Corporation.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  *
  27  *  - Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  *  - Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in
  31  *    the documentation and/or other materials provided with the
  32  *    distribution.
  33  *  - Neither the name of Intel Corporation nor the names of its
  34  *    contributors may be used to endorse or promote products derived
  35  *    from this software without specific prior written permission.
  36  *
  37  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  38  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  39  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  40  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  41  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  44  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  45  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  46  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  47  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  48  *
  49  */
  50
  51 #include <linux/pci.h>
  52 #include <linux/delay.h>
  53
  54 #include "hfi.h"
  55 #include "common.h"
  56 #include "sdma.h"
  57
  58 /**
  59  * format_hwmsg - format a single hwerror message
  60  * @msg message buffer
  61  * @msgl length of message buffer
  62  * @hwmsg message to add to message buffer
  63  */
  64 static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
  65 {
  66         strlcat(msg, "[", msgl);
  67         strlcat(msg, hwmsg, msgl);
  68         strlcat(msg, "]", msgl);
  69 }
  70
  71 /**
  72  * hfi1_format_hwerrors - format hardware error messages for display
  73  * @hwerrs hardware errors bit vector
  74  * @hwerrmsgs hardware error descriptions
  75  * @nhwerrmsgs number of hwerrmsgs
  76  * @msg message buffer
  77  * @msgl message buffer length
  78  */
  79 void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs,
  80                           size_t nhwerrmsgs, char *msg, size_t msgl)
  81 {
  82         int i;
  83
  84         for (i = 0; i < nhwerrmsgs; i++)
  85                 if (hwerrs & hwerrmsgs[i].mask)
  86                         format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
  87 }
  88
  89 static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
  90 {
  91         struct ib_event event;
  92         struct hfi1_devdata *dd = ppd->dd;
  93
  94         /*
  95          * Only call ib_dispatch_event() if the IB device has been
  96          * registered.  HFI1_INITED is set iff the driver has successfully
  97          * registered with the IB core.
  98          */
  99         if (!(dd->flags & HFI1_INITTED))
 100                 return;
 101         event.device = &dd->verbs_dev.ibdev;
 102         event.element.port_num = ppd->port;
 103         event.event = ev;
 104         ib_dispatch_event(&event);
 105 }
 106
 107 /*
 108  * Handle a linkup or link down notification.
 109  * This is called outside an interrupt.
 110  */
 111 void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
 112 {
 113         struct hfi1_pportdata *ppd = &dd->pport[0];
 114         enum ib_event_type ev;
 115
 116         if (!(ppd->linkup ^ !!linkup))
 117                 return; /* no change, nothing to do */
 118
 119         if (linkup) {
 120                 /*
 121                  * Quick linkup and all link up on the simulator does not
 122                  * trigger or implement:
 123                  *      - VerifyCap interrupt
 124                  *      - VerifyCap frames
 125                  * But rather moves directly to LinkUp.
 126                  *
 127                  * Do the work of the VerifyCap interrupt handler,
 128                  * handle_verify_cap(), but do not try moving the state to
 129                  * LinkUp as we are already there.
 130                  *
 131                  * NOTE: This uses this device's vAU, vCU, and vl15_init for
 132                  * the remote values.  Both sides must be using the values.
 133                  */
 134                 if (quick_linkup
 135                             || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
 136                         set_up_vl15(dd, dd->vau, dd->vl15_init);
 137                         assign_remote_cm_au_table(dd, dd->vcu);
 138                         ppd->neighbor_guid =
 139                                 read_csr(dd,
 140                                         DC_DC8051_STS_REMOTE_GUID);
 141                         ppd->neighbor_type =
 142                                 read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
 143                                         DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
 144                         ppd->neighbor_port_number =
 145                                 read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
 146                                         DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
 147                         dd_dev_info(dd,
 148                                 "Neighbor GUID: %llx Neighbor type %d\n",
 149                                 ppd->neighbor_guid,
 150                                 ppd->neighbor_type);
 151                 }
 152
 153                 /* physical link went up */
 154                 ppd->linkup = 1;
 155                 ppd->offline_disabled_reason = OPA_LINKDOWN_REASON_NONE;
 156
 157                 /* link widths are not available until the link is fully up */
 158                 get_linkup_link_widths(ppd);
 159
 160         } else {
 161                 /* physical link went down */
 162                 ppd->linkup = 0;
 163
 164                 /* clear HW details of the previous connection */
 165                 reset_link_credits(dd);
 166
 167                 /* freeze after a link down to guarantee a clean egress */
 168                 start_freeze_handling(ppd, FREEZE_SELF|FREEZE_LINK_DOWN);
 169
 170                 ev = IB_EVENT_PORT_ERR;
 171
 172                 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);
 173
 174                 /* if we are down, the neighbor is down */
 175                 ppd->neighbor_normal = 0;
 176
 177                 /* notify IB of the link change */
 178                 signal_ib_event(ppd, ev);
 179         }
 180
 181
 182 }
 183
 184 /*
 185  * Handle receive or urgent interrupts for user contexts.  This means a user
 186  * process was waiting for a packet to arrive, and didn't want to poll.
 187  */
 188 void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
 189 {
 190         struct hfi1_devdata *dd = rcd->dd;
 191         unsigned long flags;
 192
 193         spin_lock_irqsave(&dd->uctxt_lock, flags);
 194         if (!rcd->cnt)
 195                 goto done;
 196
 197         if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) {
 198                 wake_up_interruptible(&rcd->wait);
 199                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd->ctxt);
 200         } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
 201                                                         &rcd->event_flags)) {
 202                 rcd->urgent++;
 203                 wake_up_interruptible(&rcd->wait);
 204         }
 205 done:
 206         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 207 }