drivers/infiniband/hw/qib/qib_intr.c

   1 /*
   2  * Copyright (c) 2006, 2007, 2008, 2009, 2010 QLogic Corporation.
   3  * All rights reserved.
   4  * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #include <linux/pci.h>
  36 #include <linux/delay.h>
  37
  38 #include "qib.h"
  39 #include "qib_common.h"
  40
  41 /**
  42  * qib_format_hwmsg - format a single hwerror message
  43  * @msg message buffer
  44  * @msgl length of message buffer
  45  * @hwmsg message to add to message buffer
  46  */
  47 static void qib_format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
  48 {
  49         strlcat(msg, "[", msgl);
  50         strlcat(msg, hwmsg, msgl);
  51         strlcat(msg, "]", msgl);
  52 }
  53
  54 /**
  55  * qib_format_hwerrors - format hardware error messages for display
  56  * @hwerrs hardware errors bit vector
  57  * @hwerrmsgs hardware error descriptions
  58  * @nhwerrmsgs number of hwerrmsgs
  59  * @msg message buffer
  60  * @msgl message buffer length
  61  */
  62 void qib_format_hwerrors(u64 hwerrs, const struct qib_hwerror_msgs *hwerrmsgs,
  63                          size_t nhwerrmsgs, char *msg, size_t msgl)
  64 {
  65         int i;
  66
  67         for (i = 0; i < nhwerrmsgs; i++)
  68                 if (hwerrs & hwerrmsgs[i].mask)
  69                         qib_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
  70 }
  71
  72 static void signal_ib_event(struct qib_pportdata *ppd, enum ib_event_type ev)
  73 {
  74         struct ib_event event;
  75         struct qib_devdata *dd = ppd->dd;
  76
  77         event.device = &dd->verbs_dev.ibdev;
  78         event.element.port_num = ppd->port;
  79         event.event = ev;
  80         ib_dispatch_event(&event);
  81 }
  82
  83 void qib_handle_e_ibstatuschanged(struct qib_pportdata *ppd, u64 ibcs)
  84 {
  85         struct qib_devdata *dd = ppd->dd;
  86         unsigned long flags;
  87         u32 lstate;
  88         u8 ltstate;
  89         enum ib_event_type ev = 0;
  90
  91         lstate = dd->f_iblink_state(ibcs); /* linkstate */
  92         ltstate = dd->f_ibphys_portstate(ibcs);
  93
  94         /*
  95          * If linkstate transitions into INIT from any of the various down
  96          * states, or if it transitions from any of the up (INIT or better)
  97          * states into any of the down states (except link recovery), then
  98          * call the chip-specific code to take appropriate actions.
  99          *
 100          * ppd->lflags could be 0 if this is the first time the interrupt
 101          * handlers has been called but the link is already up.
 102          */
 103         if (lstate >= IB_PORT_INIT &&
 104             (!ppd->lflags || (ppd->lflags & QIBL_LINKDOWN)) &&
 105             ltstate == IB_PHYSPORTSTATE_LINKUP) {
 106                 /* transitioned to UP */
 107                 if (dd->f_ib_updown(ppd, 1, ibcs))
 108                         goto skip_ibchange; /* chip-code handled */
 109         } else if (ppd->lflags & (QIBL_LINKINIT | QIBL_LINKARMED |
 110                    QIBL_LINKACTIVE | QIBL_IB_FORCE_NOTIFY)) {
 111                 if (ltstate != IB_PHYSPORTSTATE_LINKUP &&
 112                     ltstate <= IB_PHYSPORTSTATE_CFG_TRAIN &&
 113                     dd->f_ib_updown(ppd, 0, ibcs))
 114                         goto skip_ibchange; /* chip-code handled */
 115                 qib_set_uevent_bits(ppd, _QIB_EVENT_LINKDOWN_BIT);
 116         }
 117
 118         if (lstate != IB_PORT_DOWN) {
 119                 /* lstate is INIT, ARMED, or ACTIVE */
 120                 if (lstate != IB_PORT_ACTIVE) {
 121                         *ppd->statusp &= ~QIB_STATUS_IB_READY;
 122                         if (ppd->lflags & QIBL_LINKACTIVE)
 123                                 ev = IB_EVENT_PORT_ERR;
 124                         spin_lock_irqsave(&ppd->lflags_lock, flags);
 125                         if (lstate == IB_PORT_ARMED) {
 126                                 ppd->lflags |= QIBL_LINKARMED | QIBL_LINKV;
 127                                 ppd->lflags &= ~(QIBL_LINKINIT |
 128                                         QIBL_LINKDOWN | QIBL_LINKACTIVE);
 129                         } else {
 130                                 ppd->lflags |= QIBL_LINKINIT | QIBL_LINKV;
 131                                 ppd->lflags &= ~(QIBL_LINKARMED |
 132                                         QIBL_LINKDOWN | QIBL_LINKACTIVE);
 133                         }
 134                         spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 135                         /* start a 75msec timer to clear symbol errors */
 136                         mod_timer(&ppd->symerr_clear_timer,
 137                                   msecs_to_jiffies(75));
 138                 } else if (ltstate == IB_PHYSPORTSTATE_LINKUP &&
 139                            !(ppd->lflags & QIBL_LINKACTIVE)) {
 140                         /* active, but not active defered */
 141                         qib_hol_up(ppd); /* useful only for 6120 now */
 142                         *ppd->statusp |=
 143                                 QIB_STATUS_IB_READY | QIB_STATUS_IB_CONF;
 144                         qib_clear_symerror_on_linkup((unsigned long)ppd);
 145                         spin_lock_irqsave(&ppd->lflags_lock, flags);
 146                         ppd->lflags |= QIBL_LINKACTIVE | QIBL_LINKV;
 147                         ppd->lflags &= ~(QIBL_LINKINIT |
 148                                 QIBL_LINKDOWN | QIBL_LINKARMED);
 149                         spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 150                         if (dd->flags & QIB_HAS_SEND_DMA)
 151                                 qib_sdma_process_event(ppd,
 152                                         qib_sdma_event_e30_go_running);
 153                         ev = IB_EVENT_PORT_ACTIVE;
 154                         dd->f_setextled(ppd, 1);
 155                 }
 156         } else { /* down */
 157                 if (ppd->lflags & QIBL_LINKACTIVE)
 158                         ev = IB_EVENT_PORT_ERR;
 159                 spin_lock_irqsave(&ppd->lflags_lock, flags);
 160                 ppd->lflags |= QIBL_LINKDOWN | QIBL_LINKV;
 161                 ppd->lflags &= ~(QIBL_LINKINIT |
 162                                  QIBL_LINKACTIVE | QIBL_LINKARMED);
 163                 spin_unlock_irqrestore(&ppd->lflags_lock, flags);
 164                 *ppd->statusp &= ~QIB_STATUS_IB_READY;
 165         }
 166
 167 skip_ibchange:
 168         ppd->lastibcstat = ibcs;
 169         if (ev)
 170                 signal_ib_event(ppd, ev);
 171         return;
 172 }
 173
 174 void qib_clear_symerror_on_linkup(unsigned long opaque)
 175 {
 176         struct qib_pportdata *ppd = (struct qib_pportdata *)opaque;
 177
 178         if (ppd->lflags & QIBL_LINKACTIVE)
 179                 return;
 180
 181         ppd->ibport_data.z_symbol_error_counter =
 182                 ppd->dd->f_portcntr(ppd, QIBPORTCNTR_IBSYMBOLERR);
 183 }
 184
 185 /*
 186  * Handle receive interrupts for user ctxts; this means a user
 187  * process was waiting for a packet to arrive, and didn't want
 188  * to poll.
 189  */
 190 void qib_handle_urcv(struct qib_devdata *dd, u64 ctxtr)
 191 {
 192         struct qib_ctxtdata *rcd;
 193         unsigned long flags;
 194         int i;
 195
 196         spin_lock_irqsave(&dd->uctxt_lock, flags);
 197         for (i = dd->first_user_ctxt; dd->rcd && i < dd->cfgctxts; i++) {
 198                 if (!(ctxtr & (1ULL << i)))
 199                         continue;
 200                 rcd = dd->rcd[i];
 201                 if (!rcd || !rcd->cnt)
 202                         continue;
 203
 204                 if (test_and_clear_bit(QIB_CTXT_WAITING_RCV, &rcd->flag)) {
 205                         wake_up_interruptible(&rcd->wait);
 206                         dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_DIS,
 207                                       rcd->ctxt);
 208                 } else if (test_and_clear_bit(QIB_CTXT_WAITING_URG,
 209                                               &rcd->flag)) {
 210                         rcd->urgent++;
 211                         wake_up_interruptible(&rcd->wait);
 212                 }
 213         }
 214         spin_unlock_irqrestore(&dd->uctxt_lock, flags);
 215 }
 216
 217 void qib_bad_intrstatus(struct qib_devdata *dd)
 218 {
 219         static int allbits;
 220
 221         /* separate routine, for better optimization of qib_intr() */
 222
 223         /*
 224          * We print the message and disable interrupts, in hope of
 225          * having a better chance of debugging the problem.
 226          */
 227         qib_dev_err(dd, "Read of chip interrupt status failed"
 228                     " disabling interrupts\n");
 229         if (allbits++) {
 230                 /* disable interrupt delivery, something is very wrong */
 231                 if (allbits == 2)
 232                         dd->f_set_intr_state(dd, 0);
 233                 if (allbits == 3) {
 234                         qib_dev_err(dd, "2nd bad interrupt status, "
 235                                     "unregistering interrupts\n");
 236                         dd->flags |= QIB_BADINTR;
 237                         dd->flags &= ~QIB_INITTED;
 238                         dd->f_free_irq(dd);
 239                 }
 240         }
 241 }