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linux/drivers/infiniband/hw/ipath/ipath_intr.c

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/*
* Copyright (c) 2006 QLogic, Inc. All rights reserved.
* Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* 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.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/pci.h>
#include "ipath_kernel.h"
#include "ipath_verbs.h"
#include "ipath_common.h"
/*
* Called when we might have an error that is specific to a particular
* PIO buffer, and may need to cancel that buffer, so it can be re-used.
*/
void ipath_disarm_senderrbufs(struct ipath_devdata *dd)
{
u32 piobcnt;
unsigned long sbuf[4];
/*
* it's possible that sendbuffererror could have bits set; might
* have already done this as a result of hardware error handling
*/
piobcnt = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
/* read these before writing errorclear */
sbuf[0] = ipath_read_kreg64(
dd, dd->ipath_kregs->kr_sendbuffererror);
sbuf[1] = ipath_read_kreg64(
dd, dd->ipath_kregs->kr_sendbuffererror + 1);
if (piobcnt > 128) {
sbuf[2] = ipath_read_kreg64(
dd, dd->ipath_kregs->kr_sendbuffererror + 2);
sbuf[3] = ipath_read_kreg64(
dd, dd->ipath_kregs->kr_sendbuffererror + 3);
}
if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
int i;
if (ipath_debug & (__IPATH_PKTDBG|__IPATH_DBG)) {
__IPATH_DBG_WHICH(__IPATH_PKTDBG|__IPATH_DBG,
"SendbufErrs %lx %lx", sbuf[0],
sbuf[1]);
if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
printk(" %lx %lx ", sbuf[2], sbuf[3]);
printk("\n");
}
for (i = 0; i < piobcnt; i++)
if (test_bit(i, sbuf))
ipath_disarm_piobufs(dd, i, 1);
dd->ipath_lastcancel = jiffies+3; /* no armlaunch for a bit */
}
}
/* These are all rcv-related errors which we want to count for stats */
#define E_SUM_PKTERRS \
(INFINIPATH_E_RHDRLEN | INFINIPATH_E_RBADTID | \
INFINIPATH_E_RBADVERSION | INFINIPATH_E_RHDR | \
INFINIPATH_E_RLONGPKTLEN | INFINIPATH_E_RSHORTPKTLEN | \
INFINIPATH_E_RMAXPKTLEN | INFINIPATH_E_RMINPKTLEN | \
INFINIPATH_E_RFORMATERR | INFINIPATH_E_RUNSUPVL | \
INFINIPATH_E_RUNEXPCHAR | INFINIPATH_E_REBP)
/* These are all send-related errors which we want to count for stats */
#define E_SUM_ERRS \
(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SUNEXPERRPKTNUM | \
INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SUNSUPVL | \
INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
INFINIPATH_E_INVALIDADDR)
/*
* these are errors that can occur when the link changes state while
* a packet is being sent or received. This doesn't cover things
* like EBP or VCRC that can be the result of a sending having the
* link change state, so we receive a "known bad" packet.
*/
#define E_SUM_LINK_PKTERRS \
(INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
INFINIPATH_E_SMINPKTLEN | INFINIPATH_E_SPKTLEN | \
INFINIPATH_E_RSHORTPKTLEN | INFINIPATH_E_RMINPKTLEN | \
INFINIPATH_E_RUNEXPCHAR)
static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
{
u64 ignore_this_time = 0;
ipath_disarm_senderrbufs(dd);
if ((errs & E_SUM_LINK_PKTERRS) &&
!(dd->ipath_flags & IPATH_LINKACTIVE)) {
/*
* This can happen when SMA is trying to bring the link
* up, but the IB link changes state at the "wrong" time.
* The IB logic then complains that the packet isn't
* valid. We don't want to confuse people, so we just
* don't print them, except at debug
*/
ipath_dbg("Ignoring packet errors %llx, because link not "
"ACTIVE\n", (unsigned long long) errs);
ignore_this_time = errs & E_SUM_LINK_PKTERRS;
}
return ignore_this_time;
}
/* generic hw error messages... */
#define INFINIPATH_HWE_TXEMEMPARITYERR_MSG(a) \
{ \
.mask = ( INFINIPATH_HWE_TXEMEMPARITYERR_##a << \
INFINIPATH_HWE_TXEMEMPARITYERR_SHIFT ), \
.msg = "TXE " #a " Memory Parity" \
}
#define INFINIPATH_HWE_RXEMEMPARITYERR_MSG(a) \
{ \
.mask = ( INFINIPATH_HWE_RXEMEMPARITYERR_##a << \
INFINIPATH_HWE_RXEMEMPARITYERR_SHIFT ), \
.msg = "RXE " #a " Memory Parity" \
}
static const struct ipath_hwerror_msgs ipath_generic_hwerror_msgs[] = {
INFINIPATH_HWE_MSG(IBCBUSFRSPCPARITYERR, "IPATH2IB Parity"),
INFINIPATH_HWE_MSG(IBCBUSTOSPCPARITYERR, "IB2IPATH Parity"),
INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOBUF),
INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOPBC),
INFINIPATH_HWE_TXEMEMPARITYERR_MSG(PIOLAUNCHFIFO),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(RCVBUF),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(LOOKUPQ),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EAGERTID),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(EXPTID),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(FLAGBUF),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(DATAINFO),
INFINIPATH_HWE_RXEMEMPARITYERR_MSG(HDRINFO),
};
/**
* ipath_format_hwmsg - format a single hwerror message
* @msg message buffer
* @msgl length of message buffer
* @hwmsg message to add to message buffer
*/
static void ipath_format_hwmsg(char *msg, size_t msgl, const char *hwmsg)
{
strlcat(msg, "[", msgl);
strlcat(msg, hwmsg, msgl);
strlcat(msg, "]", msgl);
}
/**
* ipath_format_hwerrors - format hardware error messages for display
* @hwerrs hardware errors bit vector
* @hwerrmsgs hardware error descriptions
* @nhwerrmsgs number of hwerrmsgs
* @msg message buffer
* @msgl message buffer length
*/
void ipath_format_hwerrors(u64 hwerrs,
const struct ipath_hwerror_msgs *hwerrmsgs,
size_t nhwerrmsgs,
char *msg, size_t msgl)
{
int i;
const int glen =
sizeof(ipath_generic_hwerror_msgs) /
sizeof(ipath_generic_hwerror_msgs[0]);
for (i=0; i<glen; i++) {
if (hwerrs & ipath_generic_hwerror_msgs[i].mask) {
ipath_format_hwmsg(msg, msgl,
ipath_generic_hwerror_msgs[i].msg);
}
}
for (i=0; i<nhwerrmsgs; i++) {
if (hwerrs & hwerrmsgs[i].mask) {
ipath_format_hwmsg(msg, msgl, hwerrmsgs[i].msg);
}
}
}
/* return the strings for the most common link states */
static char *ib_linkstate(u32 linkstate)
{
char *ret;
switch (linkstate) {
case IPATH_IBSTATE_INIT:
ret = "Init";
break;
case IPATH_IBSTATE_ARM:
ret = "Arm";
break;
case IPATH_IBSTATE_ACTIVE:
ret = "Active";
break;
default:
ret = "Down";
}
return ret;
}
static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
ipath_err_t errs, int noprint)
{
u64 val;
u32 ltstate, lstate;
/*
* even if diags are enabled, we want to notice LINKINIT, etc.
* We just don't want to change the LED state, or
* dd->ipath_kregs->kr_ibcctrl
*/
val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
lstate = val & IPATH_IBSTATE_MASK;
/*
* this is confusing enough when it happens that I want to always put it
* on the console and in the logs. If it was a requested state change,
* we'll have already cleared the flags, so we won't print this warning
*/
if ((lstate != IPATH_IBSTATE_ARM && lstate != IPATH_IBSTATE_ACTIVE)
&& (dd->ipath_flags & (IPATH_LINKARMED | IPATH_LINKACTIVE))) {
dev_info(&dd->pcidev->dev, "Link state changed from %s to %s\n",
(dd->ipath_flags & IPATH_LINKARMED) ? "ARM" : "ACTIVE",
ib_linkstate(lstate));
/*
* Flush all queued sends when link went to DOWN or INIT,
* to be sure that they don't block SMA and other MAD packets
*/
ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
INFINIPATH_S_ABORT);
ipath_disarm_piobufs(dd, dd->ipath_lastport_piobuf,
(unsigned)(dd->ipath_piobcnt2k +
dd->ipath_piobcnt4k) -
dd->ipath_lastport_piobuf);
}
else if (lstate == IPATH_IBSTATE_INIT || lstate == IPATH_IBSTATE_ARM ||
lstate == IPATH_IBSTATE_ACTIVE) {
/*
* only print at SMA if there is a change, debug if not
* (sometimes we want to know that, usually not).
*/
if (lstate == ((unsigned) dd->ipath_lastibcstat
& IPATH_IBSTATE_MASK)) {
ipath_dbg("Status change intr but no change (%s)\n",
ib_linkstate(lstate));
}
else
ipath_cdbg(VERBOSE, "Unit %u link state %s, last "
"was %s\n", dd->ipath_unit,
ib_linkstate(lstate),
ib_linkstate((unsigned)
dd->ipath_lastibcstat
& IPATH_IBSTATE_MASK));
}
else {
lstate = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK;
if (lstate == IPATH_IBSTATE_INIT ||
lstate == IPATH_IBSTATE_ARM ||
lstate == IPATH_IBSTATE_ACTIVE)
ipath_cdbg(VERBOSE, "Unit %u link state down"
" (state 0x%x), from %s\n",
dd->ipath_unit,
(u32)val & IPATH_IBSTATE_MASK,
ib_linkstate(lstate));
else
ipath_cdbg(VERBOSE, "Unit %u link state changed "
"to 0x%x from down (%x)\n",
dd->ipath_unit, (u32) val, lstate);
}
ltstate = (val >> INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT) &
INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
lstate = (val >> INFINIPATH_IBCS_LINKSTATE_SHIFT) &
INFINIPATH_IBCS_LINKSTATE_MASK;
if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
u32 last_ltstate;
/*
* Ignore cycling back and forth from Polling.Active
* to Polling.Quiet while waiting for the other end of
* the link to come up. We will cycle back and forth
* between them if no cable is plugged in,
* the other device is powered off or disabled, etc.
*/
last_ltstate = (dd->ipath_lastibcstat >>
INFINIPATH_IBCS_LINKTRAININGSTATE_SHIFT)
& INFINIPATH_IBCS_LINKTRAININGSTATE_MASK;
if (last_ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE
|| last_ltstate ==
INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
if (dd->ipath_ibpollcnt > 40) {
dd->ipath_flags |= IPATH_NOCABLE;
*dd->ipath_statusp |=
IPATH_STATUS_IB_NOCABLE;
} else
dd->ipath_ibpollcnt++;
goto skip_ibchange;
}
}
dd->ipath_ibpollcnt = 0; /* some state other than 2 or 3 */
ipath_stats.sps_iblink++;
if (ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
dd->ipath_flags |= IPATH_LINKDOWN;
dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
| IPATH_LINKACTIVE |
IPATH_LINKARMED);
*dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
dd->ipath_lli_counter = 0;
if (!noprint) {
if (((dd->ipath_lastibcstat >>
INFINIPATH_IBCS_LINKSTATE_SHIFT) &
INFINIPATH_IBCS_LINKSTATE_MASK)
== INFINIPATH_IBCS_L_STATE_ACTIVE)
/* if from up to down be more vocal */
ipath_cdbg(VERBOSE,
"Unit %u link now down (%s)\n",
dd->ipath_unit,
ipath_ibcstatus_str[ltstate]);
else
ipath_cdbg(VERBOSE, "Unit %u link is "
"down (%s)\n", dd->ipath_unit,
ipath_ibcstatus_str[ltstate]);
}
dd->ipath_f_setextled(dd, lstate, ltstate);
} else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_ACTIVE) {
dd->ipath_flags |= IPATH_LINKACTIVE;
dd->ipath_flags &=
~(IPATH_LINKUNK | IPATH_LINKINIT | IPATH_LINKDOWN |
IPATH_LINKARMED | IPATH_NOCABLE);
*dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
*dd->ipath_statusp |=
IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
dd->ipath_f_setextled(dd, lstate, ltstate);
} else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_INIT) {
/*
* set INIT and DOWN. Down is checked by most of the other
* code, but INIT is useful to know in a few places.
*/
dd->ipath_flags |= IPATH_LINKINIT | IPATH_LINKDOWN;
dd->ipath_flags &=
~(IPATH_LINKUNK | IPATH_LINKACTIVE | IPATH_LINKARMED
| IPATH_NOCABLE);
*dd->ipath_statusp &= ~(IPATH_STATUS_IB_NOCABLE
| IPATH_STATUS_IB_READY);
dd->ipath_f_setextled(dd, lstate, ltstate);
} else if ((val & IPATH_IBSTATE_MASK) == IPATH_IBSTATE_ARM) {
dd->ipath_flags |= IPATH_LINKARMED;
dd->ipath_flags &=
~(IPATH_LINKUNK | IPATH_LINKDOWN | IPATH_LINKINIT |
IPATH_LINKACTIVE | IPATH_NOCABLE);
*dd->ipath_statusp &= ~(IPATH_STATUS_IB_NOCABLE
| IPATH_STATUS_IB_READY);
dd->ipath_f_setextled(dd, lstate, ltstate);
} else {
if (!noprint)
ipath_dbg("IBstatuschange unit %u: %s (%x)\n",
dd->ipath_unit,
ipath_ibcstatus_str[ltstate], ltstate);
}
skip_ibchange:
dd->ipath_lastibcstat = val;
}
static void handle_supp_msgs(struct ipath_devdata *dd,
unsigned supp_msgs, char msg[512])
{
/*
* Print the message unless it's ibc status change only, which
* happens so often we never want to count it.
*/
if (dd->ipath_lasterror & ~INFINIPATH_E_IBSTATUSCHANGED) {
ipath_decode_err(msg, sizeof msg, dd->ipath_lasterror &
~INFINIPATH_E_IBSTATUSCHANGED);
if (dd->ipath_lasterror &
~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
ipath_dev_err(dd, "Suppressed %u messages for "
"fast-repeating errors (%s) (%llx)\n",
supp_msgs, msg,
(unsigned long long)
dd->ipath_lasterror);
else {
/*
* rcvegrfull and rcvhdrqfull are "normal", for some
* types of processes (mostly benchmarks) that send
* huge numbers of messages, while not processing
* them. So only complain about these at debug
* level.
*/
ipath_dbg("Suppressed %u messages for %s\n",
supp_msgs, msg);
}
}
}
static unsigned handle_frequent_errors(struct ipath_devdata *dd,
ipath_err_t errs, char msg[512],
int *noprint)
{
unsigned long nc;
static unsigned long nextmsg_time;
static unsigned nmsgs, supp_msgs;
/*
* Throttle back "fast" messages to no more than 10 per 5 seconds.
* This isn't perfect, but it's a reasonable heuristic. If we get
* more than 10, give a 6x longer delay.
*/
nc = jiffies;
if (nmsgs > 10) {
if (time_before(nc, nextmsg_time)) {
*noprint = 1;
if (!supp_msgs++)
nextmsg_time = nc + HZ * 3;
}
else if (supp_msgs) {
handle_supp_msgs(dd, supp_msgs, msg);
supp_msgs = 0;
nmsgs = 0;
}
}
else if (!nmsgs++ || time_after(nc, nextmsg_time))
nextmsg_time = nc + HZ / 2;
return supp_msgs;
}
static int handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
{
char msg[512];
u64 ignore_this_time = 0;
int i;
int chkerrpkts = 0, noprint = 0;
unsigned supp_msgs;
supp_msgs = handle_frequent_errors(dd, errs, msg, &noprint);
/*
* don't report errors that are masked (includes those always
* ignored)
*/
errs &= ~dd->ipath_maskederrs;
/* do these first, they are most important */
if (errs & INFINIPATH_E_HARDWARE) {
/* reuse same msg buf */
dd->ipath_f_handle_hwerrors(dd, msg, sizeof msg);
}
if (!noprint && (errs & ~dd->ipath_e_bitsextant))
ipath_dev_err(dd, "error interrupt with unknown errors "
"%llx set\n", (unsigned long long)
(errs & ~dd->ipath_e_bitsextant));
if (errs & E_SUM_ERRS)
ignore_this_time = handle_e_sum_errs(dd, errs);
else if ((errs & E_SUM_LINK_PKTERRS) &&
!(dd->ipath_flags & IPATH_LINKACTIVE)) {
/*
* This can happen when SMA is trying to bring the link
* up, but the IB link changes state at the "wrong" time.
* The IB logic then complains that the packet isn't
* valid. We don't want to confuse people, so we just
* don't print them, except at debug
*/
ipath_dbg("Ignoring packet errors %llx, because link not "
"ACTIVE\n", (unsigned long long) errs);
ignore_this_time = errs & E_SUM_LINK_PKTERRS;
}
if (supp_msgs == 250000) {
/*
* It's not entirely reasonable assuming that the errors set
* in the last clear period are all responsible for the
* problem, but the alternative is to assume it's the only
* ones on this particular interrupt, which also isn't great
*/
dd->ipath_maskederrs |= dd->ipath_lasterror | errs;
ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
~dd->ipath_maskederrs);
ipath_decode_err(msg, sizeof msg,
(dd->ipath_maskederrs & ~dd->
ipath_ignorederrs));
if ((dd->ipath_maskederrs & ~dd->ipath_ignorederrs) &
~(INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL))
ipath_dev_err(dd, "Disabling error(s) %llx because "
"occurring too frequently (%s)\n",
(unsigned long long)
(dd->ipath_maskederrs &
~dd->ipath_ignorederrs), msg);
else {
/*
* rcvegrfull and rcvhdrqfull are "normal",
* for some types of processes (mostly benchmarks)
* that send huge numbers of messages, while not
* processing them. So only complain about
* these at debug level.
*/
ipath_dbg("Disabling frequent queue full errors "
"(%s)\n", msg);
}
/*
* Re-enable the masked errors after around 3 minutes. in
* ipath_get_faststats(). If we have a series of fast
* repeating but different errors, the interval will keep
* stretching out, but that's OK, as that's pretty
* catastrophic.
*/
dd->ipath_unmasktime = jiffies + HZ * 180;
}
ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, errs);
if (ignore_this_time)
errs &= ~ignore_this_time;
if (errs & ~dd->ipath_lasterror) {
errs &= ~dd->ipath_lasterror;
/* never suppress duplicate hwerrors or ibstatuschange */
dd->ipath_lasterror |= errs &
~(INFINIPATH_E_HARDWARE |
INFINIPATH_E_IBSTATUSCHANGED);
}
/* likely due to cancel, so suppress */
if ((errs & (INFINIPATH_E_SPKTLEN | INFINIPATH_E_SPIOARMLAUNCH)) &&
dd->ipath_lastcancel > jiffies) {
ipath_dbg("Suppressed armlaunch/spktlen after error send cancel\n");
errs &= ~(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SPKTLEN);
}
if (!errs)
return 0;
if (!noprint)
/*
* the ones we mask off are handled specially below or above
*/
ipath_decode_err(msg, sizeof msg,
errs & ~(INFINIPATH_E_IBSTATUSCHANGED |
INFINIPATH_E_RRCVEGRFULL |
INFINIPATH_E_RRCVHDRFULL |
INFINIPATH_E_HARDWARE));
else
/* so we don't need if (!noprint) at strlcat's below */
*msg = 0;
if (errs & E_SUM_PKTERRS) {
ipath_stats.sps_pkterrs++;
chkerrpkts = 1;
}
if (errs & E_SUM_ERRS)
ipath_stats.sps_errs++;
if (errs & (INFINIPATH_E_RICRC | INFINIPATH_E_RVCRC)) {
ipath_stats.sps_crcerrs++;
chkerrpkts = 1;
}
/*
* We don't want to print these two as they happen, or we can make
* the situation even worse, because it takes so long to print
* messages to serial consoles. Kernel ports get printed from
* fast_stats, no more than every 5 seconds, user ports get printed
* on close
*/
if (errs & INFINIPATH_E_RRCVHDRFULL) {
int any;
u32 hd, tl;
ipath_stats.sps_hdrqfull++;
for (any = i = 0; i < dd->ipath_cfgports; i++) {
struct ipath_portdata *pd = dd->ipath_pd[i];
if (i == 0) {
hd = dd->ipath_port0head;
tl = (u32) le64_to_cpu(
*dd->ipath_hdrqtailptr);
} else if (pd && pd->port_cnt &&
pd->port_rcvhdrtail_kvaddr) {
/*
* don't report same point multiple times,
* except kernel
*/
tl = *(u64 *) pd->port_rcvhdrtail_kvaddr;
if (tl == dd->ipath_lastrcvhdrqtails[i])
continue;
hd = ipath_read_ureg32(dd, ur_rcvhdrhead,
i);
} else
continue;
if (hd == (tl + 1) ||
(!hd && tl == dd->ipath_hdrqlast)) {
if (i == 0)
chkerrpkts = 1;
dd->ipath_lastrcvhdrqtails[i] = tl;
pd->port_hdrqfull++;
}
}
}
if (errs & INFINIPATH_E_RRCVEGRFULL) {
/*
* since this is of less importance and not likely to
* happen without also getting hdrfull, only count
* occurrences; don't check each port (or even the kernel
* vs user)
*/
ipath_stats.sps_etidfull++;
if (dd->ipath_port0head !=
(u32) le64_to_cpu(*dd->ipath_hdrqtailptr))
chkerrpkts = 1;
}
/*
* do this before IBSTATUSCHANGED, in case both bits set in a single
* interrupt; we want the STATUSCHANGE to "win", so we do our
* internal copy of state machine correctly
*/
if (errs & INFINIPATH_E_RIBLOSTLINK) {
/*
* force through block below
*/
errs |= INFINIPATH_E_IBSTATUSCHANGED;
ipath_stats.sps_iblink++;
dd->ipath_flags |= IPATH_LINKDOWN;
dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
| IPATH_LINKARMED | IPATH_LINKACTIVE);
*dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
if (!noprint) {
u64 st = ipath_read_kreg64(
dd, dd->ipath_kregs->kr_ibcstatus);
ipath_dbg("Lost link, link now down (%s)\n",
ipath_ibcstatus_str[st & 0xf]);
}
}
if (errs & INFINIPATH_E_IBSTATUSCHANGED)
handle_e_ibstatuschanged(dd, errs, noprint);
if (errs & INFINIPATH_E_RESET) {
if (!noprint)
ipath_dev_err(dd, "Got reset, requires re-init "
"(unload and reload driver)\n");
dd->ipath_flags &= ~IPATH_INITTED; /* needs re-init */
/* mark as having had error */
*dd->ipath_statusp |= IPATH_STATUS_HWERROR;
*dd->ipath_statusp &= ~IPATH_STATUS_IB_CONF;
}
if (!noprint && *msg)
ipath_dev_err(dd, "%s error\n", msg);
if (dd->ipath_state_wanted & dd->ipath_flags) {
ipath_cdbg(VERBOSE, "driver wanted state %x, iflags now %x, "
"waking\n", dd->ipath_state_wanted,
dd->ipath_flags);
wake_up_interruptible(&ipath_state_wait);
}
return chkerrpkts;
}
/* this is separate to allow for better optimization of ipath_intr() */
static void ipath_bad_intr(struct ipath_devdata *dd, u32 * unexpectp)
{
/*
* sometimes happen during driver init and unload, don't want
* to process any interrupts at that point
*/
/* this is just a bandaid, not a fix, if something goes badly
* wrong */
if (++*unexpectp > 100) {
if (++*unexpectp > 105) {
/*
* ok, we must be taking somebody else's interrupts,
* due to a messed up mptable and/or PIRQ table, so
* unregister the interrupt. We've seen this during
* linuxbios development work, and it may happen in
* the future again.
*/
if (dd->pcidev && dd->pcidev->irq) {
ipath_dev_err(dd, "Now %u unexpected "
"interrupts, unregistering "
"interrupt handler\n",
*unexpectp);
ipath_dbg("free_irq of irq %x\n",
dd->pcidev->irq);
free_irq(dd->pcidev->irq, dd);
}
}
if (ipath_read_kreg32(dd, dd->ipath_kregs->kr_intmask)) {
ipath_dev_err(dd, "%u unexpected interrupts, "
"disabling interrupts completely\n",
*unexpectp);
/*
* disable all interrupts, something is very wrong
*/
ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
0ULL);
}
} else if (*unexpectp > 1)
ipath_dbg("Interrupt when not ready, should not happen, "
"ignoring\n");
}
static void ipath_bad_regread(struct ipath_devdata *dd)
{
static int allbits;
/* separate routine, for better optimization of ipath_intr() */
/*
* We print the message and disable interrupts, in hope of
* having a better chance of debugging the problem.
*/
ipath_dev_err(dd,
"Read of interrupt status failed (all bits set)\n");
if (allbits++) {
/* disable all interrupts, something is very wrong */
ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
if (allbits == 2) {
ipath_dev_err(dd, "Still bad interrupt status, "
"unregistering interrupt\n");
free_irq(dd->pcidev->irq, dd);
} else if (allbits > 2) {
if ((allbits % 10000) == 0)
printk(".");
} else
ipath_dev_err(dd, "Disabling interrupts, "
"multiple errors\n");
}
}
static void handle_port_pioavail(struct ipath_devdata *dd)
{
u32 i;
/*
* start from port 1, since for now port 0 is never using
* wait_event for PIO
*/
for (i = 1; dd->ipath_portpiowait && i < dd->ipath_cfgports; i++) {
struct ipath_portdata *pd = dd->ipath_pd[i];
if (pd && pd->port_cnt &&
dd->ipath_portpiowait & (1U << i)) {
clear_bit(i, &dd->ipath_portpiowait);
if (test_bit(IPATH_PORT_WAITING_PIO,
&pd->port_flag)) {
clear_bit(IPATH_PORT_WAITING_PIO,
&pd->port_flag);
wake_up_interruptible(&pd->port_wait);
}
}
}
}
static void handle_layer_pioavail(struct ipath_devdata *dd)
{
int ret;
ret = ipath_ib_piobufavail(dd->verbs_dev);
if (ret > 0)
goto set;
return;
set:
set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
dd->ipath_sendctrl);
}
/*
* Handle receive interrupts for user ports; this means a user
* process was waiting for a packet to arrive, and didn't want
* to poll
*/
static void handle_urcv(struct ipath_devdata *dd, u32 istat)
{
u64 portr;
int i;
int rcvdint = 0;
portr = ((istat >> INFINIPATH_I_RCVAVAIL_SHIFT) &
dd->ipath_i_rcvavail_mask)
| ((istat >> INFINIPATH_I_RCVURG_SHIFT) &
dd->ipath_i_rcvurg_mask);
for (i = 1; i < dd->ipath_cfgports; i++) {
struct ipath_portdata *pd = dd->ipath_pd[i];
if (portr & (1 << i) && pd && pd->port_cnt &&
test_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag)) {
int rcbit;
clear_bit(IPATH_PORT_WAITING_RCV,
&pd->port_flag);
rcbit = i + INFINIPATH_R_INTRAVAIL_SHIFT;
clear_bit(1UL << rcbit, &dd->ipath_rcvctrl);
wake_up_interruptible(&pd->port_wait);
rcvdint = 1;
}
}
if (rcvdint) {
/* only want to take one interrupt, so turn off the rcv
* interrupt for all the ports that we did the wakeup on
* (but never for kernel port)
*/
ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
dd->ipath_rcvctrl);
}
}
irqreturn_t ipath_intr(int irq, void *data)
{
struct ipath_devdata *dd = data;
u32 istat, chk0rcv = 0;
ipath_err_t estat = 0;
irqreturn_t ret;
u32 oldhead, curtail;
static unsigned unexpected = 0;
static const u32 port0rbits = (1U<<INFINIPATH_I_RCVAVAIL_SHIFT) |
(1U<<INFINIPATH_I_RCVURG_SHIFT);
ipath_stats.sps_ints++;
if (!(dd->ipath_flags & IPATH_PRESENT)) {
/*
* This return value is not great, but we do not want the
* interrupt core code to remove our interrupt handler
* because we don't appear to be handling an interrupt
* during a chip reset.
*/
return IRQ_HANDLED;
}
/*
* this needs to be flags&initted, not statusp, so we keep
* taking interrupts even after link goes down, etc.
* Also, we *must* clear the interrupt at some point, or we won't
* take it again, which can be real bad for errors, etc...
*/
if (!(dd->ipath_flags & IPATH_INITTED)) {
ipath_bad_intr(dd, &unexpected);
ret = IRQ_NONE;
goto bail;
}
/*
* We try to avoid reading the interrupt status register, since
* that's a PIO read, and stalls the processor for up to about
* ~0.25 usec. The idea is that if we processed a port0 packet,
* we blindly clear the port 0 receive interrupt bits, and nothing
* else, then return. If other interrupts are pending, the chip
* will re-interrupt us as soon as we write the intclear register.
* We then won't process any more kernel packets (if not the 2nd
* time, then the 3rd or 4th) and we'll then handle the other
* interrupts. We clear the interrupts first so that we don't
* lose intr for later packets that arrive while we are processing.
*/
oldhead = dd->ipath_port0head;
curtail = (u32)le64_to_cpu(*dd->ipath_hdrqtailptr);
if (oldhead != curtail) {
if (dd->ipath_flags & IPATH_GPIO_INTR) {
ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
(u64) (1 << IPATH_GPIO_PORT0_BIT));
istat = port0rbits | INFINIPATH_I_GPIO;
}
else
istat = port0rbits;
ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
ipath_kreceive(dd);
if (oldhead != dd->ipath_port0head) {
ipath_stats.sps_fastrcvint++;
goto done;
}
}
istat = ipath_read_kreg32(dd, dd->ipath_kregs->kr_intstatus);
if (unlikely(!istat)) {
ipath_stats.sps_nullintr++;
ret = IRQ_NONE; /* not our interrupt, or already handled */
goto bail;
}
if (unlikely(istat == -1)) {
ipath_bad_regread(dd);
/* don't know if it was our interrupt or not */
ret = IRQ_NONE;
goto bail;
}
if (unexpected)
unexpected = 0;
if (unlikely(istat & ~dd->ipath_i_bitsextant))
ipath_dev_err(dd,
"interrupt with unknown interrupts %x set\n",
istat & (u32) ~ dd->ipath_i_bitsextant);
else
ipath_cdbg(VERBOSE, "intr stat=0x%x\n", istat);
if (unlikely(istat & INFINIPATH_I_ERROR)) {
ipath_stats.sps_errints++;
estat = ipath_read_kreg64(dd,
dd->ipath_kregs->kr_errorstatus);
if (!estat)
dev_info(&dd->pcidev->dev, "error interrupt (%x), "
"but no error bits set!\n", istat);
else if (estat == -1LL)
/*
* should we try clearing all, or hope next read
* works?
*/
ipath_dev_err(dd, "Read of error status failed "
"(all bits set); ignoring\n");
else
if (handle_errors(dd, estat))
/* force calling ipath_kreceive() */
chk0rcv = 1;
}
if (istat & INFINIPATH_I_GPIO) {
/*
* GPIO interrupts fall in two broad classes:
* GPIO_2 indicates (on some HT4xx boards) that a packet
* has arrived for Port 0. Checking for this
* is controlled by flag IPATH_GPIO_INTR.
* GPIO_3..5 on IBA6120 Rev2 chips indicate errors
* that we need to count. Checking for this
* is controlled by flag IPATH_GPIO_ERRINTRS.
*/
u32 gpiostatus;
u32 to_clear = 0;
gpiostatus = ipath_read_kreg32(
dd, dd->ipath_kregs->kr_gpio_status);
/* First the error-counter case.
*/
if ((gpiostatus & IPATH_GPIO_ERRINTR_MASK) &&
(dd->ipath_flags & IPATH_GPIO_ERRINTRS)) {
/* want to clear the bits we see asserted. */
to_clear |= (gpiostatus & IPATH_GPIO_ERRINTR_MASK);
/*
* Count appropriately, clear bits out of our copy,
* as they have been "handled".
*/
if (gpiostatus & (1 << IPATH_GPIO_RXUVL_BIT)) {
ipath_dbg("FlowCtl on UnsupVL\n");
dd->ipath_rxfc_unsupvl_errs++;
}
if (gpiostatus & (1 << IPATH_GPIO_OVRUN_BIT)) {
ipath_dbg("Overrun Threshold exceeded\n");
dd->ipath_overrun_thresh_errs++;
}
if (gpiostatus & (1 << IPATH_GPIO_LLI_BIT)) {
ipath_dbg("Local Link Integrity error\n");
dd->ipath_lli_errs++;
}
gpiostatus &= ~IPATH_GPIO_ERRINTR_MASK;
}
/* Now the Port0 Receive case */
if ((gpiostatus & (1 << IPATH_GPIO_PORT0_BIT)) &&
(dd->ipath_flags & IPATH_GPIO_INTR)) {
/*
* GPIO status bit 2 is set, and we expected it.
* clear it and indicate in p0bits.
* This probably only happens if a Port0 pkt
* arrives at _just_ the wrong time, and we
* handle that by seting chk0rcv;
*/
to_clear |= (1 << IPATH_GPIO_PORT0_BIT);
gpiostatus &= ~(1 << IPATH_GPIO_PORT0_BIT);
chk0rcv = 1;
}
if (unlikely(gpiostatus)) {
/*
* Some unexpected bits remain. If they could have
* caused the interrupt, complain and clear.
* MEA: this is almost certainly non-ideal.
* we should look into auto-disable of unexpected
* GPIO interrupts, possibly on a "three strikes"
* basis.
*/
u32 mask;
mask = ipath_read_kreg32(
dd, dd->ipath_kregs->kr_gpio_mask);
if (mask & gpiostatus) {
ipath_dbg("Unexpected GPIO IRQ bits %x\n",
gpiostatus & mask);
to_clear |= (gpiostatus & mask);
}
}
if (to_clear) {
ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
(u64) to_clear);
}
}
chk0rcv |= istat & port0rbits;
/*
* Clear the interrupt bits we found set, unless they are receive
* related, in which case we already cleared them above, and don't
* want to clear them again, because we might lose an interrupt.
* Clear it early, so we "know" know the chip will have seen this by
* the time we process the queue, and will re-interrupt if necessary.
* The processor itself won't take the interrupt again until we return.
*/
ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, istat);
/*
* handle port0 receive before checking for pio buffers available,
* since receives can overflow; piobuf waiters can afford a few
* extra cycles, since they were waiting anyway, and user's waiting
* for receive are at the bottom.
*/
if (chk0rcv) {
ipath_kreceive(dd);
istat &= ~port0rbits;
}
if (istat & ((dd->ipath_i_rcvavail_mask <<
INFINIPATH_I_RCVAVAIL_SHIFT)
| (dd->ipath_i_rcvurg_mask <<
INFINIPATH_I_RCVURG_SHIFT)))
handle_urcv(dd, istat);
if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
clear_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
dd->ipath_sendctrl);
if (dd->ipath_portpiowait)
handle_port_pioavail(dd);
handle_layer_pioavail(dd);
}
done:
ret = IRQ_HANDLED;
bail:
return ret;
}
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