path: root/drivers/infiniband/hw/qib/qib_init.c

/*
 * Copyright (c) 2006, 2007, 2008, 2009, 2010 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/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/idr.h>

#include "qib.h"
#include "qib_common.h"

/*
 * min buffers we want to have per context, after driver
 */
#define QIB_MIN_USER_CTXT_BUFCNT 7

#define QLOGIC_IB_R_SOFTWARE_MASK 0xFF
#define QLOGIC_IB_R_SOFTWARE_SHIFT 24
#define QLOGIC_IB_R_EMULATOR_MASK (1ULL<<62)

/*
 * Number of ctxts we are configured to use (to allow for more pio
 * buffers per ctxt, etc.)  Zero means use chip value.
 */
ushort qib_cfgctxts;
module_param_named(cfgctxts, qib_cfgctxts, ushort, S_IRUGO);
MODULE_PARM_DESC(cfgctxts, "Set max number of contexts to use");

/*
 * If set, do not write to any regs if avoidable, hack to allow
 * check for deranged default register values.
 */
ushort qib_mini_init;
module_param_named(mini_init, qib_mini_init, ushort, S_IRUGO);
MODULE_PARM_DESC(mini_init, "If set, do minimal diag init");

unsigned qib_n_krcv_queues;
module_param_named(krcvqs, qib_n_krcv_queues, uint, S_IRUGO);
MODULE_PARM_DESC(krcvqs, "number of kernel receive queues per IB port");

/*
 * qib_wc_pat parameter:
 *      0 is WC via MTRR
 *      1 is WC via PAT
 *      If PAT initialization fails, code reverts back to MTRR
 */
unsigned qib_wc_pat = 1; /* default (1) is to use PAT, not MTRR */
module_param_named(wc_pat, qib_wc_pat, uint, S_IRUGO);
MODULE_PARM_DESC(wc_pat, "enable write-combining via PAT mechanism");

struct workqueue_struct *qib_wq;
struct workqueue_struct *qib_cq_wq;

static void verify_interrupt(unsigned long);

static struct idr qib_unit_table;
u32 qib_cpulist_count;
unsigned long *qib_cpulist;

/* set number of contexts we'll actually use */
void qib_set_ctxtcnt(struct qib_devdata *dd)
{
	if (!qib_cfgctxts) {
		dd->cfgctxts = dd->first_user_ctxt + num_online_cpus();
		if (dd->cfgctxts > dd->ctxtcnt)
			dd->cfgctxts = dd->ctxtcnt;
	} else if (qib_cfgctxts < dd->num_pports)
		dd->cfgctxts = dd->ctxtcnt;
	else if (qib_cfgctxts <= dd->ctxtcnt)
		dd->cfgctxts = qib_cfgctxts;
	else
		dd->cfgctxts = dd->ctxtcnt;
}

/*
 * Common code for creating the receive context array.
 */
int qib_create_ctxts(struct qib_devdata *dd)
{
	unsigned i;
	int ret;

	/*
	 * Allocate full ctxtcnt array, rather than just cfgctxts, because
	 * cleanup iterates across all possible ctxts.
	 */
	dd->rcd = kzalloc(sizeof(*dd->rcd) * dd->ctxtcnt, GFP_KERNEL);
	if (!dd->rcd) {
		qib_dev_err(dd, "Unable to allocate ctxtdata array, "
			    "failing\n");
		ret = -ENOMEM;
		goto done;
	}

	/* create (one or more) kctxt */
	for (i = 0; i < dd->first_user_ctxt; ++i) {
		struct qib_pportdata *ppd;
		struct qib_ctxtdata *rcd;

		if (dd->skip_kctxt_mask & (1 << i))
			continue;

		ppd = dd->pport + (i % dd->num_pp