drivers/infiniband/hw/hfi1/intr.c

   1 /*
   2  * Copyright(c) 2015, 2016 Intel Corporation.
   3  *
   4  * This file is provided under a dual BSD/GPLv2 license.  When using or
   5  * redistributing this file, you may do so under either license.
   6  *
   7  * GPL LICENSE SUMMARY
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * BSD LICENSE
  19  *
  20  * Redistribution and use in source and binary forms, with or without
  21  * modification, are permitted provided that the following conditions
  22  * are met:
  23  *
  24  *  - Redistributions of source code must retain the above copyright
  25  *    notice, this list of conditions and the following disclaimer.
  26  *  - Redistributions in binary form must reproduce the above copyright
  27  *    notice, this list of conditions and the following disclaimer in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *  - Neither the name of Intel Corporation nor the names of its
  31  *    contributors may be used to endorse or promote products derived
  32  *    from this software without specific prior written permission.
  33  *
  34  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45  *
  46  */
  47
  48 #include <linux/pci.h>
  49 #include <linux/delay.h>
  50 #include <linux/bitmap.h>
  51
  52 #include "hfi.h"
  53 #include "common.h"
  54 #include "sdma.h"
  55
  56 #define LINK_UP_DELAY  500  /* in microseconds */
  57
  58 static void set_mgmt_allowed(struct hfi1_pportdata *ppd)
  59 {
  60         u32 frame;
  61         struct hfi1_devdata *dd = ppd->dd;
  62
  63         if (ppd->neighbor_type == NEIGHBOR_TYPE_HFI) {
  64                 ppd->mgmt_allowed = 1;
  65         } else {
  66                 read_8051_config(dd, REMOTE_LNI_INFO, GENERAL_CONFIG, &frame);
  67                 ppd->mgmt_allowed = (frame >> MGMT_ALLOWED_SHIFT)
  68                 & MGMT_ALLOWED_MASK;
  69         }
  70 }
  71
  72 /*
  73  * Our neighbor has indicated that we are allowed to act as a fabric
  74  * manager, so place the full management partition key in the second
  75  * (0-based) pkey array position. Note that we should already have
  76  * the limited management partition key in array element 1, and also
  77  * that the port is not yet up when add_full_mgmt_pkey() is invoked.
  78  */
  79 static void add_full_mgmt_pkey(struct hfi1_pportdata *ppd)
  80 {
  81         struct hfi1_devdata *dd = ppd->dd;
  82
  83         /* Sanity check - ppd->pkeys[2] should be 0, or already initialized */
  84         if (!((ppd->pkeys[2] == 0) || (ppd->pkeys[2] == FULL_MGMT_P_KEY)))
  85                 dd_dev_warn(dd, "%s pkey[2] already set to 0x%x, resetting it to 0x%x\n",
  86                             __func__, ppd->pkeys[2], FULL_MGMT_P_KEY);
  87         ppd->pkeys[2] = FULL_MGMT_P_KEY;
  88         (void)hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_PKEYS, 0);
  89         hfi1_event_pkey_change(ppd->dd, ppd->port);
  90 }
  91
  92 /**
  93  * format_hwmsg - format a single hwerror message
  94  * @msg message buffer
  95  * @msgl length of message buffer
  96  * @hwmsg message to add to message buffer
  97  */
  98 static void format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
  99 {
 100         strlcat(msg, "[", msgl);
 101         strlcat(msg, hwmsg, msgl);
 102         strlcat(msg, "]", msgl);
 103 }
 104
 105 /**
 106  * hfi1_format_hwerrors - format hardware error messages for display
 107  * @hwerrs hardware errors bit vector
 108  * @hwerrmsgs hardware error descriptions
 109  * @nhwerrmsgs number of hwerrmsgs
 110  * @msg message buffer
 111  * @msgl message buffer length
 112  */
 113 void hfi1_format_hwerrors(u64 hwerrs, const struct hfi1_hwerror_msgs *hwerrmsgs,
 114                           size_t nhwerrmsgs, char *msg, size_t msgl)
 115 {
 116         int i;
 117
 118         for (i = 0; i < nhwerrmsgs; i++)
 119                 if (hwerrs & hwerrmsgs[i].mask)
 120                         format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
 121 }
 122
 123 static void signal_ib_event(struct hfi1_pportdata *ppd, enum ib_event_type ev)
 124 {
 125         struct ib_event event;
 126         struct hfi1_devdata *dd = ppd->dd;
 127
 128         /*
 129          * Only call ib_dispatch_event() if the IB device has been
 130          * registered.  HFI1_INITED is set iff the driver has successfully
 131          * registered with the IB core.
 132          */
 133         if (!(dd->flags & HFI1_INITTED))
 134                 return;
 135         event.device = &dd->verbs_dev.rdi.ibdev;
 136         event.element.port_num = ppd->port;
 137         event.event = ev;
 138         ib_dispatch_event(&event);
 139 }
 140
 141 /**
 142  * handle_linkup_change - finish linkup/down state changes
 143  * @dd: valid device
 144  * @linkup: link state information
 145  *
 146  * Handle a linkup or link down notification.
 147  * The HW needs time to finish its link up state change. Give it that chance.
 148  *
 149  * This is called outside an interrupt.
 150  *
 151  */
 152 void handle_linkup_change(struct hfi1_devdata *dd, u32 linkup)
 153 {
 154         struct hfi1_pportdata *ppd = &dd->pport[0];
 155         enum ib_event_type ev;
 156
 157         if (!(ppd->linkup ^ !!linkup))
 158                 return; /* no change, nothing to do */
 159
 160         if (linkup) {
 161                 /*
 162                  * Quick linkup and all link up on the simulator does not
 163                  * trigger or implement:
 164                  *      - VerifyCap interrupt
 165                  *      - VerifyCap frames
 166                  * But rather moves directly to LinkUp.
 167                  *
 168                  * Do the work of the VerifyCap interrupt handler,
 169                  * handle_verify_cap(), but do not try moving the state to
 170                  * LinkUp as we are already there.
 171                  *
 172                  * NOTE: This uses this device's vAU, vCU, and vl15_init for
 173                  * the remote values.  Both sides must be using the values.
 174                  */
 175                 if (quick_linkup || dd->icode == ICODE_FUNCTIONAL_SIMULATOR) {
 176                         set_up_vau(dd, dd->vau);
 177                         set_up_vl15(dd, dd->vl15_init);
 178                         assign_remote_cm_au_table(dd, dd->vcu);
 179                 }
 180
 181                 ppd->neighbor_guid =
 182                         read_csr(dd, DC_DC8051_STS_REMOTE_GUID);
 183                 ppd->neighbor_type =
 184                         read_csr(dd, DC_DC8051_STS_REMOTE_NODE_TYPE) &
 185                                  DC_DC8051_STS_REMOTE_NODE_TYPE_VAL_MASK;
 186                 ppd->neighbor_port_number =
 187                         read_csr(dd, DC_DC8051_STS_REMOTE_PORT_NO) &
 188                                  DC_DC8051_STS_REMOTE_PORT_NO_VAL_SMASK;
 189                 ppd->neighbor_fm_security =
 190                         read_csr(dd, DC_DC8051_STS_REMOTE_FM_SECURITY) &
 191                                  DC_DC8051_STS_LOCAL_FM_SECURITY_DISABLED_MASK;
 192                 dd_dev_info(dd,
 193                             "Neighbor Guid %llx, Type %d, Port Num %d\n",
 194                             ppd->neighbor_guid, ppd->neighbor_type,
 195                             ppd->neighbor_port_number);
 196
 197                 /* HW needs LINK_UP_DELAY to settle, give it that chance */
 198                 udelay(LINK_UP_DELAY);
 199
 200                 /*
 201                  * 'MgmtAllowed' information, which is exchanged during
 202                  * LNI, is available at this point.
 203                  */
 204                 set_mgmt_allowed(ppd);
 205
 206                 if (ppd->mgmt_allowed)
 207                         add_full_mgmt_pkey(ppd);
 208
 209                 /* physical link went up */
 210                 ppd->linkup = 1;
 211                 ppd->offline_disabled_reason =
 212                         HFI1_ODR_MASK(OPA_LINKDOWN_REASON_NONE);
 213
 214                 /* link widths are not available until the link is fully up */
 215                 get_linkup_link_widths(ppd);
 216
 217         } else {
 218                 /* physical link went down */
 219                 ppd->linkup = 0;
 220
 221                 /* clear HW details of the previous connection */
 222                 ppd->actual_vls_operational = 0;
 223                 reset_link_credits(dd);
 224
 225                 /* freeze after a link down to guarantee a clean egress */
 226                 start_freeze_handling(ppd, FREEZE_SELF | FREEZE_LINK_DOWN);
 227
 228                 ev = IB_EVENT_PORT_ERR;
 229
 230                 hfi1_set_uevent_bits(ppd, _HFI1_EVENT_LINKDOWN_BIT);
 231
 232                 /* if we are down, the neighbor is down */
 233                 ppd->neighbor_normal = 0;
 234
 235                 /* notify IB of the link change */
 236                 signal_ib_event(ppd, ev);
 237         }
 238 }
 239
 240 /*
 241  * Handle receive or urgent interrupts for user contexts.  This means a user
 242  * process was waiting for a packet to arrive, and didn't want to poll.
 243  */
 244 void handle_user_interrupt(struct hfi1_ctxtdata *rcd)
 245 {
 246         struct hfi1_devdata *dd = rcd->dd;
 247         unsigned long flags;
 248
 249         spin_lock_irqsave(&dd->uctxt_lock, flags);
 250         if (bitmap_empty(rcd->in_use_ctxts, HFI1_MAX_SHARED_CTXTS))
 251                 goto done;
 252
 253         if (test_and_clear_bit(HFI1_CTXT_WAITING_RCV, &rcd->event_flags)) {
 254                 wake_up_interruptible(&rcd->wait);
 255                 hfi1_rcvctrl(dd, HFI1_RCVCTRL_INTRAVAIL_DIS, rcd);
 256         } else if (test_and_clear_bit(HFI1_CTXT_WAITING_URG,
 257                                                         &rcd->event_flags)) {
 258                 rcd->urgent++;
 259                 wake_up_interruptible(&rcd->wait);
 260         }
 261 done:
 262         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 263 }