Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband

* 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/roland/infiniband:
  IB/ipath: kbuild infrastructure
  IB/ipath: infiniband verbs support
  IB/ipath: misc infiniband code, part 2
  IB/ipath: misc infiniband code, part 1
  IB/ipath: infiniband RC protocol support
  IB/ipath: infiniband UC and UD protocol support
  IB/ipath: infiniband header files
  IB/ipath: layering interfaces used by higher-level driver code
  IB/ipath: support for userspace apps using core driver
  IB/ipath: sysfs and ipathfs support for core driver
  IB/ipath: misc driver support code
  IB/ipath: chip initialisation code, and diag support
  IB/ipath: support for PCI Express devices
  IB/ipath: support for HyperTransport devices
  IB/ipath: core driver header files
  IB/ipath: core device driver

1 files changed, 841 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_intr.c b/drivers/infiniband/hw/ipath/ipath_intr.c
new file mode 100644
index 000000000000..60f5f4108069
--- /dev/null
+++ b/drivers/infiniband/hw/ipath/ipath_intr.c
@@ -0,0 +1,841 @@
+/*
+ * 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 "ips_common.h"
+#include "ipath_layer.h"
+
+#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)
+
+#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)
+
+static u64 handle_e_sum_errs(struct ipath_devdata *dd, ipath_err_t errs)
+{
+	unsigned long sbuf[4];
+	u64 ignore_this_time = 0;
+	u32 piobcnt;
+
+	/* if possible that sendbuffererror could be valid */
+	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;
+
+		ipath_cdbg(PKT, "SendbufErrs %lx %lx ", sbuf[0], sbuf[1]);
+		if (ipath_debug & __IPATH_PKTDBG && piobcnt > 128)
+			printk("%lx %lx ", sbuf[2], sbuf[3]);
+		for (i = 0; i < piobcnt; i++) {
+			if (test_bit(i, sbuf)) {
+				u32 __iomem *piobuf;
+				if (i < dd->ipath_piobcnt2k)
+					piobuf = (u32 __iomem *)
+						(dd->ipath_pio2kbase +
+						 i * dd->ipath_palign);
+				else
+					piobuf = (u32 __iomem *)
+						(dd->ipath_pio4kbase +
+						 (i - dd->ipath_piobcnt2k) *
+						 dd->ipath_4kalign);
+
+				ipath_cdbg(PKT,
+					   "PIObuf[%u] @%p pbc is %x; ",
+					   i, piobuf, readl(piobuf));
+
+				ipath_disarm_piobufs(dd, i, 1);
+			}
+		}
+		if (ipath_debug & __IPATH_PKTDBG)
+			printk("\n");
+	}
+	if ((errs & (INFINIPATH_E_SDROPPEDDATAPKT |
+		     INFINIPATH_E_SDROPPEDSMPPKT |
+		     INFINIPATH_E_SMINPKTLEN)) &&
+	    !(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 pktsend errors %llx, because not "
+			  "yet active\n", (unsigned long long) errs);
+		ignore_this_time = INFINIPATH_E_SDROPPEDDATAPKT |
+			INFINIPATH_E_SDROPPEDSMPPKT |
+			INFINIPATH_E_SMINPKTLEN;
+	}
+
+	return ignore_this_time;
+}
+
+/* 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;
+	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(SMA, "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(SMA, "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;
+		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(SMA,
+					   "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);
+
+		__ipath_layer_intr(dd, IPATH_LAYER_INT_IF_UP);
+	} 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 void 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 & ~infinipath_e_bitsextant))
+		ipath_dev_err(dd, "error interrupt with unknown errors "
+			      "%llx set\n", (unsigned long long)
+			      (errs & ~infinipath_e_bitsextant));
+
+	if (errs & E_SUM_ERRS)
+		ignore_this_time = handle_e_sum_errs(dd, errs);
+
+	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 "
+				      "occuring 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);
+	}
+	if (!errs)
+		return;
+
+	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 = (u32) * 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)) {
+				dd->ipath_lastrcvhdrqtails[i] = tl;
+				pd->port_hdrqfull++;
+				if (i == 0)
+					chkerrpkts = 1;
+			}
+		}
+	}
+	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_sma_state_wanted & dd->ipath_flags) {
+		ipath_cdbg(VERBOSE, "sma wanted state %x, iflags now %x, "
+			   "waking\n", dd->ipath_sma_state_wanted,
+			   dd->ipath_flags);
+		wake_up_interruptible(&ipath_sma_state_wait);
+	}
+
+	if (chkerrpkts)
+		/* process possible error packets in hdrq */
+		ipath_kreceive(dd);
+}
+
+/* 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_layer_intr(dd, IPATH_LAYER_INT_SEND_CONTINUE);
+	if (ret > 0)
+		goto clear;
+
+	ret = __ipath_verbs_piobufavail(dd);
+	if (ret > 0)
+		goto clear;
+
+	return;
+clear:
+	set_bit(IPATH_S_PIOINTBUFAVAIL, &dd->ipath_sendctrl);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
+			 dd->ipath_sendctrl);
+}
+
+static void handle_rcv(struct ipath_devdata *dd, u32 istat)
+{
+	u64 portr;
+	int i;
+	int rcvdint = 0;
+
+	portr = ((istat >> INFINIPATH_I_RCVAVAIL_SHIFT) &
+		 infinipath_i_rcvavail_mask)
+		| ((istat >> INFINIPATH_I_RCVURG_SHIFT) &
+		   infinipath_i_rcvurg_mask);
+	for (i = 0; i < dd->ipath_cfgports; i++) {
+		struct ipath_portdata *pd = dd->ipath_pd[i];
+		if (portr & (1 << i) && pd &&
+		    pd->port_cnt) {
+			if (i == 0)
+				ipath_kreceive(dd);
+			else if (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 pt_regs *regs)
+{
+	struct ipath_devdata *dd = data;
+	u32 istat = ipath_read_kreg32(dd, dd->ipath_kregs->kr_intstatus);
+	ipath_err_t estat = 0;
+	static unsigned unexpected = 0;
+	irqreturn_t ret;
+
+	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;
+	}
+
+	ipath_stats.sps_ints++;
+
+	/*
+	 * 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;
+	}
+	if (unexpected)
+		unexpected = 0;
+
+	ipath_cdbg(VERBOSE, "intr stat=0x%x\n", istat);
+
+	if (istat & ~infinipath_i_bitsextant)
+		ipath_dev_err(dd,
+			      "interrupt with unknown interrupts %x set\n",
+			      istat & (u32) ~ infinipath_i_bitsextant);
+
+	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 (%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
+			handle_errors(dd, estat);
+	}
+
+	if (istat & INFINIPATH_I_GPIO) {
+		if (unlikely(!(dd->ipath_flags & IPATH_GPIO_INTR))) {
+			u32 gpiostatus;
+			gpiostatus = ipath_read_kreg32(
+				dd, dd->ipath_kregs->kr_gpio_status);
+			ipath_dbg("Unexpected GPIO interrupt bits %x\n",
+				  gpiostatus);
+			ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
+					 gpiostatus);
+		}
+		else {
+			/* Clear GPIO status bit 2 */
+			ipath_write_kreg(dd, dd->ipath_kregs->kr_gpio_clear,
+					 (u64) (1 << 2));
+
+			/*
+			 * Packets are available in the port 0 rcv queue.
+			 * Eventually this needs to be generalized to check
+			 * IPATH_GPIO_INTR, and the specific GPIO bit, if
+			 * GPIO interrupts are used for anything else.
+			 */
+			ipath_kreceive(dd);
+		}
+	}
+
+	/*
+	 * clear the ones we will deal with on this round
+	 * We clear it early, mostly for receive interrupts, so we
+	 * 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);
+
+	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);
+	}
+
+	/*
+	 * we check for both transition from empty to non-empty, and urgent
+	 * packets (those with the interrupt bit set in the header)
+	 */
+
+	if (istat & ((infinipath_i_rcvavail_mask <<
+		      INFINIPATH_I_RCVAVAIL_SHIFT)
+		     | (infinipath_i_rcvurg_mask <<
+			INFINIPATH_I_RCVURG_SHIFT)))
+		handle_rcv(dd, istat);
+
+	ret = IRQ_HANDLED;
+
+bail:
+	return ret;
+}