path: root/drivers/infiniband/hw/ipath/ipath_intr.c

/*
 * Copyright (c) 2006, 2007 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 "ipath_kernel.h"
#include "ipath_verbs.h"
#include "ipath_common.h"

/*
 * clear (write) a pio buffer, to clear a parity error.   This routine
 * should only be called when in freeze mode, and the buffer should be
 * canceled afterwards.
 */
static void ipath_clrpiobuf(struct ipath_devdata *dd, u32 pnum)
{
	u32 __iomem *pbuf;
	u32 dwcnt; /* dword count to write */
	if (pnum < dd->ipath_piobcnt2k) {
		pbuf = (u32 __iomem *) (dd->ipath_pio2kbase + pnum *
			dd->ipath_palign);
		dwcnt = dd->ipath_piosize2k >> 2;
	}
	else {
		pbuf = (u32 __iomem *) (dd->ipath_pio4kbase +
			(pnum - dd->ipath_piobcnt2k) * dd->ipath_4kalign);
		dwcnt = dd->ipath_piosize4k >> 2;
	}
	dev_info(&dd->pcidev->dev,
		"Rewrite PIO buffer %u, to recover from parity error\n",
		pnum);
	*pbuf = dwcnt+1; /* no flush required, since already in freeze */
	while(--dwcnt)
		*pbuf++ = 0;
}

/*
 * 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.
 * If rewrite is true, and bits are set in the sendbufferror registers,
 * we'll write to the buffer, for error recovery on parity errors.
 */
static void ipath_disarm_senderrbufs(struct ipath_devdata *dd, int rewrite)
{
	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) &&
			dd->ipath_lastcancel > jiffies) {
			__IPATH_DBG_WHICH(__IPATH_PKTDBG|__IPATH_DBG,
					  "SendbufErrs %lx %lx", sbuf