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android_kernel_xiaomi_sm8350/drivers/infiniband/hw/ipath/ipath_intr.c
Roland Dreier 44f8e3f3f7 IB/ipath: Remove unused "write-only" variables 
Remove variables that are set but then never looked at in the ipath
driver.  These cleanups came from David Binderman's list of "set but
never used" warnings from icc.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
2006-12-12 11:50:20 -08:00

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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) {
u32 hd, tl;
ipath_stats.sps_hdrqfull++;
for (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->ipath_irq) {
ipath_dev_err(dd, "Now %u unexpected "
"interrupts, unregistering "
"interrupt handler\n",
*unexpectp);
ipath_dbg("free_irq of irq %d\n",
dd->ipath_irq);
dd->ipath_f_free_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");
dd->ipath_f_free_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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