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linux/drivers/infiniband/hw/ipath/ipath_intr.c
Alexey Dobriyan d43c36dc6b headers: remove sched.h from interrupt.h 
After m68k's task_thread_info() doesn't refer to current,
it's possible to remove sched.h from interrupt.h and not break m68k!
Many thanks to Heiko Carstens for allowing this.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
2009-10-11 11:20:58 -07:00

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/*
* Copyright (c) 2006, 2007, 2008 QLogic Corporation. 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 <linux/delay.h>
#include <linux/sched.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);
if (piobcnt > 192)
sbuf[3] = ipath_read_kreg64(
dd, dd->ipath_kregs->kr_sendbuffererror + 3);
else
sbuf[3] = 0;
if (sbuf[0] || sbuf[1] || (piobcnt > 128 && (sbuf[2] || sbuf[3]))) {
int i;
if (ipath_debug & (__IPATH_PKTDBG|__IPATH_DBG) &&
dd->ipath_lastcancel > jiffies) {
__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);
/* ignore armlaunch errs for a bit */
dd->ipath_lastcancel = jiffies+3;
}
}
/* 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)
/*
* this is similar to E_SUM_ERRS, but can't ignore armlaunch, don't ignore
* errors not related to freeze and cancelling buffers. Can't ignore
* armlaunch because could get more while still cleaning up, and need
* to cancel those as they happen.
*/
#define E_SPKT_ERRS_IGNORE \
(INFINIPATH_E_SDROPPEDDATAPKT | INFINIPATH_E_SDROPPEDSMPPKT | \
INFINIPATH_E_SMAXPKTLEN | INFINIPATH_E_SMINPKTLEN | \
INFINIPATH_E_SPKTLEN)
/*
* 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(struct ipath_devdata *dd, u64 ibcs)
{
char *ret;
u32 state;
state = ipath_ib_state(dd, ibcs);
if (state == dd->ib_init)
ret = "Init";
else if (state == dd->ib_arm)
ret = "Arm";
else if (state == dd->ib_active)
ret = "Active";
else
ret = "Down";
return ret;
}
void signal_ib_event(struct ipath_devdata *dd, enum ib_event_type ev)
{
struct ib_event event;
event.device = &dd->verbs_dev->ibdev;
event.element.port_num = 1;
event.event = ev;
ib_dispatch_event(&event);
}
static void handle_e_ibstatuschanged(struct ipath_devdata *dd,
ipath_err_t errs)
{
u32 ltstate, lstate, ibstate, lastlstate;
u32 init = dd->ib_init;
u32 arm = dd->ib_arm;
u32 active = dd->ib_active;
const u64 ibcs = ipath_read_kreg64(dd, dd->ipath_kregs->kr_ibcstatus);
lstate = ipath_ib_linkstate(dd, ibcs); /* linkstate */
ibstate = ipath_ib_state(dd, ibcs);
/* linkstate at last interrupt */
lastlstate = ipath_ib_linkstate(dd, dd->ipath_lastibcstat);
ltstate = ipath_ib_linktrstate(dd, ibcs); /* linktrainingtate */
/*
* Since going into a recovery state causes the link state to go
* down and since recovery is transitory, it is better if we "miss"
* ever seeing the link training state go into recovery (i.e.,
* ignore this transition for link state special handling purposes)
* without even updating ipath_lastibcstat.
*/
if ((ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERRETRAIN) ||
(ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERWAITRMT) ||
(ltstate == INFINIPATH_IBCS_LT_STATE_RECOVERIDLE))
goto done;
/*
* if linkstate transitions into INIT from any of the various down
* states, or if it transitions from any of the up (INIT or better)
* states into any of the down states (except link recovery), then
* call the chip-specific code to take appropriate actions.
*/
if (lstate >= INFINIPATH_IBCS_L_STATE_INIT &&
lastlstate == INFINIPATH_IBCS_L_STATE_DOWN) {
/* transitioned to UP */
if (dd->ipath_f_ib_updown(dd, 1, ibcs)) {
/* link came up, so we must no longer be disabled */
dd->ipath_flags &= ~IPATH_IB_LINK_DISABLED;
ipath_cdbg(LINKVERB, "LinkUp handled, skipped\n");
goto skip_ibchange; /* chip-code handled */
}
} else if ((lastlstate >= INFINIPATH_IBCS_L_STATE_INIT ||
(dd->ipath_flags & IPATH_IB_FORCE_NOTIFY)) &&
ltstate <= INFINIPATH_IBCS_LT_STATE_CFGWAITRMT &&
ltstate != INFINIPATH_IBCS_LT_STATE_LINKUP) {
int handled;
handled = dd->ipath_f_ib_updown(dd, 0, ibcs);
dd->ipath_flags &= ~IPATH_IB_FORCE_NOTIFY;
if (handled) {
ipath_cdbg(LINKVERB, "LinkDown handled, skipped\n");
goto skip_ibchange; /* chip-code handled */
}
}
/*
* Significant enough to always print and get into logs, if it was
* unexpected. If it was a requested state change, we'll have
* already cleared the flags, so we won't print this warning
*/
if ((ibstate != arm && 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(dd, ibcs));
}
if (ltstate == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
ltstate == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
u32 lastlts;
lastlts = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat);
/*
* Ignore cycling back and forth from Polling.Active to
* Polling.Quiet while waiting for the other end of the link
* to come up, except to try and decide if we are connected
* to a live IB device or not. We will cycle back and
* forth between them if no cable is plugged in, the other
* device is powered off or disabled, etc.
*/
if (lastlts == INFINIPATH_IBCS_LT_STATE_POLLACTIVE ||
lastlts == INFINIPATH_IBCS_LT_STATE_POLLQUIET) {
if (!(dd->ipath_flags & IPATH_IB_AUTONEG_INPROG) &&
(++dd->ipath_ibpollcnt == 40)) {
dd->ipath_flags |= IPATH_NOCABLE;
*dd->ipath_statusp |=
IPATH_STATUS_IB_NOCABLE;
ipath_cdbg(LINKVERB, "Set NOCABLE\n");
}
ipath_cdbg(LINKVERB, "POLL change to %s (%x)\n",
ipath_ibcstatus_str[ltstate], ibstate);
goto skip_ibchange;
}
}
dd->ipath_ibpollcnt = 0; /* not poll*, now */
ipath_stats.sps_iblink++;
if (ibstate != init && dd->ipath_lastlinkrecov && ipath_linkrecovery) {
u64 linkrecov;
linkrecov = ipath_snap_cntr(dd,
dd->ipath_cregs->cr_iblinkerrrecovcnt);
if (linkrecov != dd->ipath_lastlinkrecov) {
ipath_dbg("IB linkrecov up %Lx (%s %s) recov %Lu\n",
(unsigned long long) ibcs,
ib_linkstate(dd, ibcs),
ipath_ibcstatus_str[ltstate],
(unsigned long long) linkrecov);
/* and no more until active again */
dd->ipath_lastlinkrecov = 0;
ipath_set_linkstate(dd, IPATH_IB_LINKDOWN);
goto skip_ibchange;
}
}
if (ibstate == init || ibstate == arm || ibstate == active) {
*dd->ipath_statusp &= ~IPATH_STATUS_IB_NOCABLE;
if (ibstate == init || ibstate == arm) {
*dd->ipath_statusp &= ~IPATH_STATUS_IB_READY;
if (dd->ipath_flags & IPATH_LINKACTIVE)
signal_ib_event(dd, IB_EVENT_PORT_ERR);
}
if (ibstate == arm) {
dd->ipath_flags |= IPATH_LINKARMED;
dd->ipath_flags &= ~(IPATH_LINKUNK |
IPATH_LINKINIT | IPATH_LINKDOWN |
IPATH_LINKACTIVE | IPATH_NOCABLE);
ipath_hol_down(dd);
} else if (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_LINKARMED | IPATH_LINKACTIVE |
IPATH_NOCABLE);
ipath_hol_down(dd);
} else { /* active */
dd->ipath_lastlinkrecov = ipath_snap_cntr(dd,
dd->ipath_cregs->cr_iblinkerrrecovcnt);
*dd->ipath_statusp |=
IPATH_STATUS_IB_READY | IPATH_STATUS_IB_CONF;
dd->ipath_flags |= IPATH_LINKACTIVE;
dd->ipath_flags &= ~(IPATH_LINKUNK | IPATH_LINKINIT
| IPATH_LINKDOWN | IPATH_LINKARMED |
IPATH_NOCABLE);
if (dd->ipath_flags & IPATH_HAS_SEND_DMA)
ipath_restart_sdma(dd);
signal_ib_event(dd, IB_EVENT_PORT_ACTIVE);
/* LED active not handled in chip _f_updown */
dd->ipath_f_setextled(dd, lstate, ltstate);
ipath_hol_up(dd);
}
/*
* print after we've already done the work, so as not to
* delay the state changes and notifications, for debugging
*/
if (lstate == lastlstate)
ipath_cdbg(LINKVERB, "Unchanged from last: %s "
"(%x)\n", ib_linkstate(dd, ibcs), ibstate);
else
ipath_cdbg(VERBOSE, "Unit %u: link up to %s %s (%x)\n",
dd->ipath_unit, ib_linkstate(dd, ibcs),
ipath_ibcstatus_str[ltstate], ibstate);
} else { /* down */
if (dd->ipath_flags & IPATH_LINKACTIVE)
signal_ib_event(dd, IB_EVENT_PORT_ERR);
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 (lastlstate != INFINIPATH_IBCS_L_STATE_DOWN)
ipath_cdbg(VERBOSE, "Unit %u link state down "
"(state 0x%x), from %s\n",
dd->ipath_unit, lstate,
ib_linkstate(dd, dd->ipath_lastibcstat));
else
ipath_cdbg(LINKVERB, "Unit %u link state changed "
"to %s (0x%x) from down (%x)\n",
dd->ipath_unit,
ipath_ibcstatus_str[ltstate],
ibstate, lastlstate);
}
skip_ibchange:
dd->ipath_lastibcstat = ibcs;
done:
return;
}
static void handle_supp_msgs(struct ipath_devdata *dd,
unsigned supp_msgs, char *msg, u32 msgsz)
{
/*
* 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) {
int iserr;
ipath_err_t mask;
iserr = ipath_decode_err(dd, msg, msgsz,
dd->ipath_lasterror &
~INFINIPATH_E_IBSTATUSCHANGED);
mask = INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
INFINIPATH_E_PKTERRS | INFINIPATH_E_SDMADISABLED;
/* if we're in debug, then don't mask SDMADISABLED msgs */
if (ipath_debug & __IPATH_DBG)
mask &= ~INFINIPATH_E_SDMADISABLED;
if (dd->ipath_lasterror & ~mask)
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.
*/
if (iserr)
ipath_dbg("Suppressed %u messages for %s\n",
supp_msgs, msg);
else
ipath_cdbg(ERRPKT,
"Suppressed %u messages for %s\n",
supp_msgs, msg);
}
}
}
static unsigned handle_frequent_errors(struct ipath_devdata *dd,
ipath_err_t errs, char *msg,
u32 msgsz, 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, msgsz);
supp_msgs = 0;
nmsgs = 0;
}
}
else if (!nmsgs++ || time_after(nc, nextmsg_time))
nextmsg_time = nc + HZ / 2;
return supp_msgs;
}
static void handle_sdma_errors(struct ipath_devdata *dd, ipath_err_t errs)
{
unsigned long flags;
int expected;
if (ipath_debug & __IPATH_DBG) {
char msg[128];
ipath_decode_err(dd, msg, sizeof msg, errs &
INFINIPATH_E_SDMAERRS);
ipath_dbg("errors %lx (%s)\n", (unsigned long)errs, msg);
}
if (ipath_debug & __IPATH_VERBDBG) {
unsigned long tl, hd, status, lengen;
tl = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmatail);
hd = ipath_read_kreg64(dd, dd->ipath_kregs->kr_senddmahead);
status = ipath_read_kreg64(dd
, dd->ipath_kregs->kr_senddmastatus);
lengen = ipath_read_kreg64(dd,
dd->ipath_kregs->kr_senddmalengen);
ipath_cdbg(VERBOSE, "sdma tl 0x%lx hd 0x%lx status 0x%lx "
"lengen 0x%lx\n", tl, hd, status, lengen);
}
spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
__set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
expected = test_bit(IPATH_SDMA_ABORTING, &dd->ipath_sdma_status);
spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
if (!expected)
ipath_cancel_sends(dd, 1);
}
static void handle_sdma_intr(struct ipath_devdata *dd, u64 istat)
{
unsigned long flags;
int expected;
if ((istat & INFINIPATH_I_SDMAINT) &&
!test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
ipath_sdma_intr(dd);
if (istat & INFINIPATH_I_SDMADISABLED) {
expected = test_bit(IPATH_SDMA_ABORTING,
&dd->ipath_sdma_status);
ipath_dbg("%s SDmaDisabled intr\n",
expected ? "expected" : "unexpected");
spin_lock_irqsave(&dd->ipath_sdma_lock, flags);
__set_bit(IPATH_SDMA_DISABLED, &dd->ipath_sdma_status);
spin_unlock_irqrestore(&dd->ipath_sdma_lock, flags);
if (!expected)
ipath_cancel_sends(dd, 1);
if (!test_bit(IPATH_SDMA_SHUTDOWN, &dd->ipath_sdma_status))
tasklet_hi_schedule(&dd->ipath_sdma_abort_task);
}
}
static int handle_hdrq_full(struct ipath_devdata *dd)
{
int chkerrpkts = 0;
u32 hd, tl;
u32 i;
ipath_stats.sps_hdrqfull++;
for (i = 0; i < dd->ipath_cfgports; i++) {
struct ipath_portdata *pd = dd->ipath_pd[i];
if (i == 0) {
/*
* For kernel receive queues, we just want to know
* if there are packets in the queue that we can
* process.
*/
if (pd->port_head != ipath_get_hdrqtail(pd))
chkerrpkts |= 1 << i;
continue;
}
/* Skip if user context is not open */
if (!pd || !pd->port_cnt)
continue;
/* Don't report the same point multiple times. */
if (dd->ipath_flags & IPATH_NODMA_RTAIL)
tl = ipath_read_ureg32(dd, ur_rcvhdrtail, i);
else
tl = ipath_get_rcvhdrtail(pd);
if (tl == pd->port_lastrcvhdrqtail)
continue;
hd = ipath_read_ureg32(dd, ur_rcvhdrhead, i);
if (hd == (tl + 1) || (!hd && tl == dd->ipath_hdrqlast)) {
pd->port_lastrcvhdrqtail = tl;
pd->port_hdrqfull++;
/* flush hdrqfull so that poll() sees it */
wmb();
wake_up_interruptible(&pd->port_wait);
}
}
return chkerrpkts;
}
static int handle_errors(struct ipath_devdata *dd, ipath_err_t errs)
{
char msg[128];
u64 ignore_this_time = 0;
u64 iserr = 0;
int chkerrpkts = 0, noprint = 0;
unsigned supp_msgs;
int log_idx;
/*
* don't report errors that are masked, either at init
* (not set in ipath_errormask), or temporarily (set in
* ipath_maskederrs)
*/
errs &= dd->ipath_errormask & ~dd->ipath_maskederrs;
supp_msgs = handle_frequent_errors(dd, errs, msg, (u32)sizeof msg,
&noprint);
/* 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);
} else {
u64 mask;
for (log_idx = 0; log_idx < IPATH_EEP_LOG_CNT; ++log_idx) {
mask = dd->ipath_eep_st_masks[log_idx].errs_to_log;
if (errs & mask)
ipath_inc_eeprom_err(dd, log_idx, 1);
}
}
if (errs & INFINIPATH_E_SDMAERRS)
handle_sdma_errors(dd, errs);
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) {
int s_iserr;
/*
* 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;
dd->ipath_errormask &= ~dd->ipath_maskederrs;
ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
dd->ipath_errormask);
s_iserr = ipath_decode_err(dd, msg, sizeof msg,
dd->ipath_maskederrs);
if (dd->ipath_maskederrs &
~(INFINIPATH_E_RRCVEGRFULL |
INFINIPATH_E_RRCVHDRFULL | INFINIPATH_E_PKTERRS))
ipath_dev_err(dd, "Temporarily disabling "
"error(s) %llx reporting; too frequent (%s)\n",
(unsigned long long) dd->ipath_maskederrs,
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.
*/
if (s_iserr)
ipath_dbg("Temporarily disabling reporting "
"too frequent queue full errors (%s)\n",
msg);
else
ipath_cdbg(ERRPKT,
"Temporarily disabling reporting too"
" frequent packet 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);
}
if (errs & INFINIPATH_E_SENDSPECIALTRIGGER) {
dd->ipath_spectriggerhit++;
ipath_dbg("%lu special trigger hits\n",
dd->ipath_spectriggerhit);
}
/* likely due to cancel; so suppress message unless verbose */
if ((errs & (INFINIPATH_E_SPKTLEN | INFINIPATH_E_SPIOARMLAUNCH)) &&
dd->ipath_lastcancel > jiffies) {
/* armlaunch takes precedence; it often causes both. */
ipath_cdbg(VERBOSE,
"Suppressed %s error (%llx) after sendbuf cancel\n",
(errs & INFINIPATH_E_SPIOARMLAUNCH) ?
"armlaunch" : "sendpktlen", (unsigned long long)errs);
errs &= ~(INFINIPATH_E_SPIOARMLAUNCH | INFINIPATH_E_SPKTLEN);
}
if (!errs)
return 0;
if (!noprint) {
ipath_err_t mask;
/*
* The ones we mask off are handled specially below
* or above. Also mask SDMADISABLED by default as it
* is too chatty.
*/
mask = INFINIPATH_E_IBSTATUSCHANGED |
INFINIPATH_E_RRCVEGRFULL | INFINIPATH_E_RRCVHDRFULL |
INFINIPATH_E_HARDWARE | INFINIPATH_E_SDMADISABLED;
/* if we're in debug, then don't mask SDMADISABLED msgs */
if (ipath_debug & __IPATH_DBG)
mask &= ~INFINIPATH_E_SDMADISABLED;
ipath_decode_err(dd, msg, sizeof msg, errs & ~mask);
} 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;
}
iserr = errs & ~(E_SUM_PKTERRS | INFINIPATH_E_PKTERRS);
/*
* 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)
chkerrpkts |= handle_hdrq_full(dd);
if (errs & INFINIPATH_E_RRCVEGRFULL) {
struct ipath_portdata *pd = dd->ipath_pd[0];
/*
* 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 (pd->port_head != ipath_get_hdrqtail(pd))
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;
ipath_dbg("Lost link, link now down (%s)\n",
ipath_ibcstatus_str[ipath_read_kreg64(dd,
dd->ipath_kregs->kr_ibcstatus) & 0xf]);
}
if (errs & INFINIPATH_E_IBSTATUSCHANGED)
handle_e_ibstatuschanged(dd, errs);
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) {
if (iserr)
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;
}
/*
* try to cleanup as much as possible for anything that might have gone
* wrong while in freeze mode, such as pio buffers being written by user
* processes (causing armlaunch), send errors due to going into freeze mode,
* etc., and try to avoid causing extra interrupts while doing so.
* Forcibly update the in-memory pioavail register copies after cleanup
* because the chip won't do it while in freeze mode (the register values
* themselves are kept correct).
* Make sure that we don't lose any important interrupts by using the chip
* feature that says that writing 0 to a bit in *clear that is set in
* *status will cause an interrupt to be generated again (if allowed by
* the *mask value).
*/
void ipath_clear_freeze(struct ipath_devdata *dd)
{
/* disable error interrupts, to avoid confusion */
ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask, 0ULL);
/* also disable interrupts; errormask is sometimes overwriten */
ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, 0ULL);
ipath_cancel_sends(dd, 1);
/* clear the freeze, and be sure chip saw it */
ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
dd->ipath_control);
ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
/* force in-memory update now we are out of freeze */
ipath_force_pio_avail_update(dd);
/*
* force new interrupt if any hwerr, error or interrupt bits are
* still set, and clear "safe" send packet errors related to freeze
* and cancelling sends. Re-enable error interrupts before possible
* force of re-interrupt on pending interrupts.
*/
ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear, 0ULL);
ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
E_SPKT_ERRS_IGNORE);
ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
dd->ipath_errormask);
ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask, -1LL);
ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
}
/* this is separate to allow for better optimization of ipath_intr() */
static noinline 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_ireg(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 noinline 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_layer_pioavail(struct ipath_devdata *dd)
{
unsigned long flags;
int ret;
ret = ipath_ib_piobufavail(dd->verbs_dev);
if (ret > 0)
goto set;
return;
set:
spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL;
ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
dd->ipath_sendctrl);
ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
}
/*
* 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, u64 istat)
{
u64 portr;
int i;
int rcvdint = 0;
/*
* test_and_clear_bit(IPATH_PORT_WAITING_RCV) and
* test_and_clear_bit(IPATH_PORT_WAITING_URG) below
* would both like timely updates of the bits so that
* we don't pass them by unnecessarily. the rmb()
* here ensures that we see them promptly -- the
* corresponding wmb()'s are in ipath_poll_urgent()
* and ipath_poll_next()...
*/
rmb();
portr = ((istat >> dd->ipath_i_rcvavail_shift) &
dd->ipath_i_rcvavail_mask) |
((istat >> dd->ipath_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) {
if (test_and_clear_bit(IPATH_PORT_WAITING_RCV,
&pd->port_flag)) {
clear_bit(i + dd->ipath_r_intravail_shift,
&dd->ipath_rcvctrl);
wake_up_interruptible(&pd->port_wait);
rcvdint = 1;
} else if (test_and_clear_bit(IPATH_PORT_WAITING_URG,
&pd->port_flag)) {
pd->port_urgent++;
wake_up_interruptible(&pd->port_wait);
}
}
}
if (rcvdint) {
/* only want to take one interrupt, so turn off the rcv
* interrupt for all the ports that we set the rcv_waiting
* (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;
u64 istat, chk0rcv = 0;
ipath_err_t estat = 0;
irqreturn_t ret;
static unsigned unexpected = 0;
u64 kportrbits;
ipath_stats.sps_ints++;
if (dd->ipath_int_counter != (u32) -1)
dd->ipath_int_counter++;
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;
}
istat = ipath_read_ireg(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 %Lx set\n",
(unsigned long long)
istat & ~dd->ipath_i_bitsextant);
else if (istat & ~INFINIPATH_I_ERROR) /* errors do own printing */
ipath_cdbg(VERBOSE, "intr stat=0x%Lx\n",
(unsigned long long) istat);
if (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 (%Lx), "
"but no error bits set!\n",
(unsigned long long) 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
chk0rcv |= handle_errors(dd, estat);
}
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 and IBA6110 Rev4 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 (gpiostatus) {
/*
* Some unexpected bits remain. If they could have
* caused the interrupt, complain and clear.
* To avoid repetition of this condition, also clear
* the mask. It is almost certainly due to error.
*/
const u32 mask = (u32) dd->ipath_gpio_mask;
if (mask & gpiostatus) {
ipath_dbg("Unexpected GPIO IRQ bits %x\n",
gpiostatus & mask);
to_clear |= (gpiostatus & mask);
dd->ipath_gpio_mask &= ~(gpiostatus & mask);
ipath_write_kreg(dd,
dd->ipath_kregs->kr_gpio_mask,
dd->ipath_gpio_mask);
}
}
if (to_clear) {
ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
(u64) to_clear);
}
}
/*
* 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 kernel receive queues 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.
*/
kportrbits = (1ULL << dd->ipath_i_rcvavail_shift) |
(1ULL << dd->ipath_i_rcvurg_shift);
if (chk0rcv || (istat & kportrbits)) {
istat &= ~kportrbits;
ipath_kreceive(dd->ipath_pd[0]);
}
if (istat & ((dd->ipath_i_rcvavail_mask << dd->ipath_i_rcvavail_shift) |
(dd->ipath_i_rcvurg_mask << dd->ipath_i_rcvurg_shift)))
handle_urcv(dd, istat);
if (istat & (INFINIPATH_I_SDMAINT | INFINIPATH_I_SDMADISABLED))
handle_sdma_intr(dd, istat);
if (istat & INFINIPATH_I_SPIOBUFAVAIL) {
unsigned long flags;
spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags);
dd->ipath_sendctrl &= ~INFINIPATH_S_PIOINTBUFAVAIL;
ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
dd->ipath_sendctrl);
ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags);
/* always process; sdma verbs uses PIO for acks and VL15 */
handle_layer_pioavail(dd);
}
ret = IRQ_HANDLED;
bail:
return ret;
}
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