[PATCH 6 of 18] ipath - chip initialisation code

[Bryan O'Sullivan]

ipath_init_chip.c sets up an InfiniPath device for use.

Signed-off-by: Bryan O'Sullivan <bos@xxxxxxxxxxxxx>

diff -r 057022f0645a -r 4a34e16a8d87 drivers/infiniband/hw/ipath/ipath_init_chip.c
--- /dev/null	Thu Jan  1 00:00:00 1970 +0000
+++ b/drivers/infiniband/hw/ipath/ipath_init_chip.c	Thu Mar 23 20:27:45 2006 -0800
@@ -0,0 +1,963 @@
+/*
+ * 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 "ipath_kernel.h"
+#include "ips_common.h"
+
+/*
+ * min buffers we want to have per port, after driver
+ */
+#define IPATH_MIN_USER_PORT_BUFCNT 8
+
+/*
+ * Number of ports we are configured to use (to allow for more pio
+ * buffers per port, etc.)  Zero means use chip value.
+ */
+static ushort ipath_cfgports;
+
+module_param_named(cfgports, ipath_cfgports, ushort, S_IRUGO);
+MODULE_PARM_DESC(cfgports, "Set max number of ports to use");
+
+/*
+ * Number of buffers reserved for driver (layered drivers and SMA
+ * send).  Reserved at end of buffer list.
+ */
+static ushort ipath_kpiobufs = 32;
+
+static int ipath_set_kpiobufs(const char *val, struct kernel_param *kp);
+
+module_param_call(kpiobufs, ipath_set_kpiobufs, param_get_uint,
+		  &ipath_kpiobufs, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(kpiobufs, "Set number of PIO buffers for driver");
+
+/**
+ * create_port0_egr - allocate the eager TID buffers
+ * @dd: the infinipath device
+ *
+ * This code is now quite different for user and kernel, because
+ * the kernel uses skb's, for the accelerated network performance.
+ * This is the kernel (port0) version.
+ *
+ * Allocate the eager TID buffers and program them into infinipath.
+ * We use the network layer alloc_skb() allocator to allocate the
+ * memory, and either use the buffers as is for things like SMA
+ * packets, or pass the buffers up to the ipath layered driver and
+ * thence the network layer, replacing them as we do so (see
+ * ipath_rcv_layer()).
+ */
+static int create_port0_egr(struct ipath_devdata *dd)
+{
+	unsigned e, egrcnt;
+	struct sk_buff **skbs;
+	int ret;
+
+	egrcnt = dd->ipath_rcvegrcnt;
+
+	skbs = vmalloc(sizeof(*dd->ipath_port0_skbs) * egrcnt);
+	if (skbs == NULL) {
+		ipath_dev_err(dd, "allocation error for eager TID "
+			      "skb array\n");
+		ret = -ENOMEM;
+		goto bail;
+	}
+	for (e = 0; e < egrcnt; e++) {
+		/*
+		 * This is a bit tricky in that we allocate extra
+		 * space for 2 bytes of the 14 byte ethernet header.
+		 * These two bytes are passed in the ipath header so
+		 * the rest of the data is word aligned.  We allocate
+		 * 4 bytes so that the data buffer stays word aligned.
+		 * See ipath_kreceive() for more details.
+		 */
+		skbs[e] = ipath_alloc_skb(dd, GFP_KERNEL);
+		if (!skbs[e]) {
+			ipath_dev_err(dd, "SKB allocation error for "
+				      "eager TID %u\n", e);
+			while (e != 0)
+				dev_kfree_skb(skbs[--e]);
+			ret = -ENOMEM;
+			goto bail;
+		}
+	}
+	/*
+	 * After loop above, so we can test non-NULL to see if ready
+	 * to use at receive, etc.
+	 */
+	dd->ipath_port0_skbs = skbs;
+
+	for (e = 0; e < egrcnt; e++) {
+		unsigned long phys =
+			virt_to_phys(dd->ipath_port0_skbs[e]->data);
+		dd->ipath_f_put_tid(dd, e + (u64 __iomem *)
+				    ((char __iomem *) dd->ipath_kregbase +
+				     dd->ipath_rcvegrbase), 0, phys);
+	}
+
+	ret = 0;
+
+bail:
+	return ret;
+}
+
+static int bringup_link(struct ipath_devdata *dd)
+{
+	u64 val, ibc;
+	int ret = 0;
+
+	/* hold IBC in reset */
+	dd->ipath_control &= ~INFINIPATH_C_LINKENABLE;
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
+			 dd->ipath_control);
+
+	/*
+	 * Note that prior to try 14 or 15 of IB, the credit scaling
+	 * wasn't working, because it was swapped for writes with the
+	 * 1 bit default linkstate field
+	 */
+
+	/* ignore pbc and align word */
+	val = dd->ipath_piosize2k - 2 * sizeof(u32);
+	/*
+	 * for ICRC, which we only send in diag test pkt mode, and we
+	 * don't need to worry about that for mtu
+	 */
+	val += 1;
+	/*
+	 * Set the IBC maxpktlength to the size of our pio buffers the
+	 * maxpktlength is in words.  This is *not* the IB data MTU.
+	 */
+	ibc = (val / sizeof(u32)) << INFINIPATH_IBCC_MAXPKTLEN_SHIFT;
+	/* in KB */
+	ibc |= 0x5ULL << INFINIPATH_IBCC_FLOWCTRLWATERMARK_SHIFT;
+	/*
+	 * How often flowctrl sent.  More or less in usecs; balance against
+	 * watermark value, so that in theory senders always get a flow
+	 * control update in time to not let the IB link go idle.
+	 */
+	ibc |= 0x3ULL << INFINIPATH_IBCC_FLOWCTRLPERIOD_SHIFT;
+	/* max error tolerance */
+	ibc |= 0xfULL << INFINIPATH_IBCC_PHYERRTHRESHOLD_SHIFT;
+	/* use "real" buffer space for */
+	ibc |= 4ULL << INFINIPATH_IBCC_CREDITSCALE_SHIFT;
+	/* IB credit flow control. */
+	ibc |= 0xfULL << INFINIPATH_IBCC_OVERRUNTHRESHOLD_SHIFT;
+	/* initially come up waiting for TS1, without sending anything. */
+	dd->ipath_ibcctrl = ibc;
+	/*
+	 * Want to start out with both LINKCMD and LINKINITCMD in NOP
+	 * (0 and 0).  Don't put linkinitcmd in ipath_ibcctrl, want that
+	 * to stay a NOP
+	 */
+	ibc |= INFINIPATH_IBCC_LINKINITCMD_DISABLE <<
+		INFINIPATH_IBCC_LINKINITCMD_SHIFT;
+	ipath_cdbg(VERBOSE, "Writing 0x%llx to ibcctrl\n",
+		   (unsigned long long) ibc);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_ibcctrl, ibc);
+
+	// be sure chip saw it
+	val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch);
+
+	ret = dd->ipath_f_bringup_serdes(dd);
+
+	if (ret)
+		dev_info(&dd->pcidev->dev, "Could not initialize SerDes, "
+			 "not usable\n");
+	else {
+		/* enable IBC */
+		dd->ipath_control |= INFINIPATH_C_LINKENABLE;
+		ipath_write_kreg(dd, dd->ipath_kregs->kr_control,
+				 dd->ipath_control);
+	}
+
+	return ret;
+}
+
+static int init_chip_first(struct ipath_devdata *dd,
+			   struct ipath_portdata **pdp)
+{
+	struct ipath_portdata *pd = NULL;
+	int ret = 0;
+	u64 val;
+
+	/*
+	 * skip cfgports stuff because we are not allocating memory,
+	 * and we don't want problems if the portcnt changed due to
+	 * cfgports.  We do still check and report a difference, if
+	 * not same (should be impossible).
+	 */
+	dd->ipath_portcnt =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_portcnt);
+	if (!ipath_cfgports)
+		dd->ipath_cfgports = dd->ipath_portcnt;
+	else if (ipath_cfgports <= dd->ipath_portcnt) {
+		dd->ipath_cfgports = ipath_cfgports;
+		ipath_dbg("Configured to use %u ports out of %u in chip\n",
+			  dd->ipath_cfgports, dd->ipath_portcnt);
+	} else {
+		dd->ipath_cfgports = dd->ipath_portcnt;
+		ipath_dbg("Tried to configured to use %u ports; chip "
+			  "only supports %u\n", ipath_cfgports,
+			  dd->ipath_portcnt);
+	}
+	dd->ipath_pd = kzalloc(sizeof(*dd->ipath_pd) * dd->ipath_cfgports,
+			       GFP_KERNEL);
+
+	if (!dd->ipath_pd) {
+		ipath_dev_err(dd, "Unable to allocate portdata array, "
+			      "failing\n");
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	dd->ipath_lastegrheads = kzalloc(sizeof(*dd->ipath_lastegrheads)
+					 * dd->ipath_cfgports,
+					 GFP_KERNEL);
+	dd->ipath_lastrcvhdrqtails =
+		kzalloc(sizeof(*dd->ipath_lastrcvhdrqtails)
+			* dd->ipath_cfgports, GFP_KERNEL);
+
+	if (!dd->ipath_lastegrheads || !dd->ipath_lastrcvhdrqtails) {
+		ipath_dev_err(dd, "Unable to allocate head arrays, "
+			      "failing\n");
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	dd->ipath_pd[0] = kzalloc(sizeof(*pd), GFP_KERNEL);
+
+	if (!dd->ipath_pd[0]) {
+		ipath_dev_err(dd, "Unable to allocate portdata for port "
+			      "0, failing\n");
+		ret = -ENOMEM;
+		goto done;
+	}
+	pd = dd->ipath_pd[0];
+	pd->port_dd = dd;
+	pd->port_port = 0;
+	pd->port_cnt = 1;
+	/* The port 0 pkey table is used by the layer interface. */
+	pd->port_pkeys[0] = IPS_DEFAULT_P_KEY;
+	dd->ipath_rcvtidcnt =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
+	dd->ipath_rcvtidbase =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
+	dd->ipath_rcvegrcnt =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
+	dd->ipath_rcvegrbase =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
+	dd->ipath_palign =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_pagealign);
+	dd->ipath_piobufbase =
+		ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufbase);
+	val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiosize);
+	dd->ipath_piosize2k = val & ~0U;
+	dd->ipath_piosize4k = val >> 32;
+	dd->ipath_ibmtu = 4096;	/* default to largest legal MTU */
+	val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpiobufcnt);
+	dd->ipath_piobcnt2k = val & ~0U;
+	dd->ipath_piobcnt4k = val >> 32;
+	dd->ipath_pio2kbase =
+		(u32 __iomem *) (((char __iomem *) dd->ipath_kregbase) +
+				 (dd->ipath_piobufbase & 0xffffffff));
+	if (dd->ipath_piobcnt4k) {
+		dd->ipath_pio4kbase = (u32 __iomem *)
+			(((char __iomem *) dd->ipath_kregbase) +
+			 (dd->ipath_piobufbase >> 32));
+		/*
+		 * 4K buffers take 2 pages; we use roundup just to be
+		 * paranoid; we calculate it once here, rather than on
+		 * ever buf allocate
+		 */
+		dd->ipath_4kalign = ALIGN(dd->ipath_piosize4k,
+					  dd->ipath_palign);
+		ipath_dbg("%u 2k(%x) piobufs @ %p, %u 4k(%x) @ %p "
+			  "(%x aligned)\n",
+			  dd->ipath_piobcnt2k, dd->ipath_piosize2k,
+			  dd->ipath_pio2kbase, dd->ipath_piobcnt4k,
+			  dd->ipath_piosize4k, dd->ipath_pio4kbase,
+			  dd->ipath_4kalign);
+	}
+	else ipath_dbg("%u 2k piobufs @ %p\n",
+		       dd->ipath_piobcnt2k, dd->ipath_pio2kbase);
+
+	spin_lock_init(&dd->ipath_tid_lock);
+
+done:
+	*pdp = pd;
+	return ret;
+}
+
+/**
+ * init_chip_reset - re-initialize after a reset, or enable
+ * @dd: the infinipath device
+ * @pdp: output for port data
+ *
+ * sanity check at least some of the values after reset, and
+ * ensure no receive or transmit (explictly, in case reset
+ * failed
+ */
+static int init_chip_reset(struct ipath_devdata *dd,
+			   struct ipath_portdata **pdp)
+{
+	struct ipath_portdata *pd;
+	u32 rtmp;
+
+	*pdp = pd = dd->ipath_pd[0];
+	/* ensure chip does no sends or receives while we re-initialize */
+	dd->ipath_control = dd->ipath_sendctrl = dd->ipath_rcvctrl = 0U;
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, 0);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, 0);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0);
+
+	rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_portcnt);
+	if (dd->ipath_portcnt != rtmp)
+		dev_info(&dd->pcidev->dev, "portcnt was %u before "
+			 "reset, now %u, using original\n",
+			 dd->ipath_portcnt, rtmp);
+	rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidcnt);
+	if (rtmp != dd->ipath_rcvtidcnt)
+		dev_info(&dd->pcidev->dev, "tidcnt was %u before "
+			 "reset, now %u, using original\n",
+			 dd->ipath_rcvtidcnt, rtmp);
+	rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvtidbase);
+	if (rtmp != dd->ipath_rcvtidbase)
+		dev_info(&dd->pcidev->dev, "tidbase was %u before "
+			 "reset, now %u, using original\n",
+			 dd->ipath_rcvtidbase, rtmp);
+	rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrcnt);
+	if (rtmp != dd->ipath_rcvegrcnt)
+		dev_info(&dd->pcidev->dev, "egrcnt was %u before "
+			 "reset, now %u, using original\n",
+			 dd->ipath_rcvegrcnt, rtmp);
+	rtmp = ipath_read_kreg32(dd, dd->ipath_kregs->kr_rcvegrbase);
+	if (rtmp != dd->ipath_rcvegrbase)
+		dev_info(&dd->pcidev->dev, "egrbase was %u before "
+			 "reset, now %u, using original\n",
+			 dd->ipath_rcvegrbase, rtmp);
+
+	return 0;
+}
+
+static int init_pioavailregs(struct ipath_devdata *dd)
+{
+	int ret;
+
+	dd->ipath_pioavailregs_dma = dma_alloc_coherent(
+		&dd->pcidev->dev, PAGE_SIZE, &dd->ipath_pioavailregs_phys,
+		GFP_KERNEL);
+	if (!dd->ipath_pioavailregs_dma) {
+		ipath_dev_err(dd, "failed to allocate PIOavail reg area "
+			      "in memory\n");
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	/*
+	 * we really want L2 cache aligned, but for current CPUs of
+	 * interest, they are the same.
+	 */
+	dd->ipath_statusp = (u64 *)
+		((char *)dd->ipath_pioavailregs_dma +
+		 ((2 * L1_CACHE_BYTES +
+		   dd->ipath_pioavregs * sizeof(u64)) & ~L1_CACHE_BYTES));
+	/* copy the current value now that it's really allocated */
+	*dd->ipath_statusp = dd->_ipath_status;
+	/*
+	 * setup buffer to hold freeze msg, accessible to apps,
+	 * following statusp
+	 */
+	dd->ipath_freezemsg = (char *)&dd->ipath_statusp[1];
+	/* and its length */
+	dd->ipath_freezelen = L1_CACHE_BYTES - sizeof(dd->ipath_statusp[0]);
+
+	if (dd->ipath_unit * 64 > (IPATH_PORT0_RCVHDRTAIL_SIZE - 64)) {
+		ipath_dev_err(dd, "unit %u too large for port 0 "
+			      "rcvhdrtail buffer size\n", dd->ipath_unit);
+		ret = -ENODEV;
+	}
+	else
+		ret = 0;
+
+	/* so we can get current tail in ipath_kreceive(), per chip */
+	dd->ipath_hdrqtailptr = &ipath_port0_rcvhdrtail[
+		dd->ipath_unit * (64 / sizeof(*ipath_port0_rcvhdrtail))];
+done:
+	return ret;
+}
+
+/**
+ * init_shadow_tids - allocate the shadow TID array
+ * @dd: the infinipath device
+ *
+ * allocate the shadow TID array, so we can ipath_munlock previous
+ * entries.  It may make more sense to move the pageshadow to the
+ * port data structure, so we only allocate memory for ports actually
+ * in use, since we at 8k per port, now.
+ */
+static void init_shadow_tids(struct ipath_devdata *dd)
+{
+	dd->ipath_pageshadow = (struct page **)
+		vmalloc(dd->ipath_cfgports * dd->ipath_rcvtidcnt *
+			sizeof(struct page *));
+	if (!dd->ipath_pageshadow)
+		ipath_dev_err(dd, "failed to allocate shadow page * "
+			      "array, no expected sends!\n");
+	else
+		memset(dd->ipath_pageshadow, 0,
+		       dd->ipath_cfgports * dd->ipath_rcvtidcnt *
+		       sizeof(struct page *));
+}
+
+static void enable_chip(struct ipath_devdata *dd,
+			struct ipath_portdata *pd, int reinit)
+{
+	u32 val;
+	int i;
+
+	if (!reinit) {
+		init_waitqueue_head(&ipath_sma_wait);
+		init_waitqueue_head(&ipath_sma_state_wait);
+	}
+
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
+			 dd->ipath_rcvctrl);
+
+	/* Enable PIO send, and update of PIOavail regs to memory. */
+	dd->ipath_sendctrl = INFINIPATH_S_PIOENABLE |
+		INFINIPATH_S_PIOBUFAVAILUPD;
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
+			 dd->ipath_sendctrl);
+
+	/*
+	 * enable port 0 receive, and receive interrupt.  other ports
+	 * done as user opens and inits them.
+	 */
+	dd->ipath_rcvctrl = INFINIPATH_R_TAILUPD |
+		(1ULL << INFINIPATH_R_PORTENABLE_SHIFT) |
+		(1ULL << INFINIPATH_R_INTRAVAIL_SHIFT);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl,
+			 dd->ipath_rcvctrl);
+
+	/*
+	 * now ready for use.  this should be cleared whenever we
+	 * detect a reset, or initiate one.
+	 */
+	dd->ipath_flags |= IPATH_INITTED;
+
+	/*
+	 * init our shadow copies of head from tail values, and write
+	 * head values to match.
+	 */
+	val = ipath_read_ureg32(dd, ur_rcvegrindextail, 0);
+	(void)ipath_write_ureg(dd, ur_rcvegrindexhead, val, 0);
+	dd->ipath_port0head = ipath_read_ureg32(dd, ur_rcvhdrtail, 0);
+
+	/* Initialize so we interrupt on next packet received */
+	(void)ipath_write_ureg(dd, ur_rcvhdrhead,
+			       dd->ipath_rhdrhead_intr_off |
+			       dd->ipath_port0head, 0);
+
+	/*
+	 * by now pioavail updates to memory should have occurred, so
+	 * copy them into our working/shadow registers; this is in
+	 * case something went wrong with abort, but mostly to get the
+	 * initial values of the generation bit correct.
+	 */
+	for (i = 0; i < dd->ipath_pioavregs; i++) {
+		__le64 val;
+
+		/*
+		 * Chip Errata bug 6641; even and odd qwords>3 are swapped.
+		 */
+		if (i > 3) {
+			if (i & 1)
+				val = dd->ipath_pioavailregs_dma[i - 1];
+			else
+				val = dd->ipath_pioavailregs_dma[i + 1];
+		}
+		else
+			val = dd->ipath_pioavailregs_dma[i];
+		dd->ipath_pioavailshadow[i] = __le64_to_cpu(val);
+	}
+	/* can get counters, stats, etc. */
+	dd->ipath_flags |= IPATH_PRESENT;
+}
+
+static int init_housekeeping(struct ipath_devdata *dd,
+			     struct ipath_portdata **pdp, int reinit)
+{
+	char boardn[32];
+	int ret = 0;
+
+	/*
+	 * have to clear shadow copies of registers at init that are
+	 * not otherwise set here, or all kinds of bizarre things
+	 * happen with driver on chip reset
+	 */
+	dd->ipath_rcvhdrsize = 0;
+
+	/*
+	 * Don't clear ipath_flags as 8bit mode was set before
+	 * entering this func. However, we do set the linkstate to
+	 * unknown, so we can watch for a transition.
+	 */
+	dd->ipath_flags |= IPATH_LINKUNK;
+	dd->ipath_flags &= ~(IPATH_LINKACTIVE | IPATH_LINKARMED |
+			     IPATH_LINKDOWN | IPATH_LINKINIT);
+
+	ipath_cdbg(VERBOSE, "Try to read spc chip revision\n");
+	dd->ipath_revision =
+		ipath_read_kreg64(dd, dd->ipath_kregs->kr_revision);
+
+	/*
+	 * set up fundamental info we need to use the chip; we assume
+	 * if the revision reg and these regs are OK, we don't need to
+	 * special case the rest
+	 */
+	dd->ipath_sregbase =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_sendregbase);
+	dd->ipath_cregbase =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_counterregbase);
+	dd->ipath_uregbase =
+		ipath_read_kreg32(dd, dd->ipath_kregs->kr_userregbase);
+	ipath_cdbg(VERBOSE, "ipath_kregbase %p, sendbase %x usrbase %x, "
+		   "cntrbase %x\n", dd->ipath_kregbase, dd->ipath_sregbase,
+		   dd->ipath_uregbase, dd->ipath_cregbase);
+	if ((dd->ipath_revision & 0xffffffff) == 0xffffffff
+	    || (dd->ipath_sregbase & 0xffffffff) == 0xffffffff
+	    || (dd->ipath_cregbase & 0xffffffff) == 0xffffffff
+	    || (dd->ipath_uregbase & 0xffffffff) == 0xffffffff) {
+		ipath_dev_err(dd, "Register read failures from chip, "
+			      "giving up initialization\n");
+		ret = -ENODEV;
+		goto done;
+	}
+
+	/* clear the initial reset flag, in case first driver load */
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear,
+			 INFINIPATH_E_RESET);
+
+	if (reinit)
+		ret = init_chip_reset(dd, pdp);
+	else
+		ret = init_chip_first(dd, pdp);
+
+	if (ret)
+		goto done;
+
+	ipath_cdbg(VERBOSE, "Revision %llx (PCI %x), %u ports, %u tids, "
+		   "%u egrtids\n", (unsigned long long) dd->ipath_revision,
+		   dd->ipath_pcirev, dd->ipath_portcnt, dd->ipath_rcvtidcnt,
+		   dd->ipath_rcvegrcnt);
+
+	if (((dd->ipath_revision >> INFINIPATH_R_SOFTWARE_SHIFT) &
+	     INFINIPATH_R_SOFTWARE_MASK) != IPATH_CHIP_SWVERSION) {
+		ipath_dev_err(dd, "Driver only handles version %d, "
+			      "chip swversion is %d (%llx), failng\n",
+			      IPATH_CHIP_SWVERSION,
+			      (int)(dd->ipath_revision >>
+				    INFINIPATH_R_SOFTWARE_SHIFT) &
+			      INFINIPATH_R_SOFTWARE_MASK,
+			      (unsigned long long) dd->ipath_revision);
+		ret = -ENOSYS;
+		goto done;
+	}
+	dd->ipath_majrev = (u8) ((dd->ipath_revision >>
+				  INFINIPATH_R_CHIPREVMAJOR_SHIFT) &
+				 INFINIPATH_R_CHIPREVMAJOR_MASK);
+	dd->ipath_minrev = (u8) ((dd->ipath_revision >>
+				  INFINIPATH_R_CHIPREVMINOR_SHIFT) &
+				 INFINIPATH_R_CHIPREVMINOR_MASK);
+	dd->ipath_boardrev = (u8) ((dd->ipath_revision >>
+				    INFINIPATH_R_BOARDID_SHIFT) &
+				   INFINIPATH_R_BOARDID_MASK);
+
+	ret = dd->ipath_f_get_boardname(dd, boardn, sizeof boardn);
+
+	snprintf(dd->ipath_boardversion, sizeof(dd->ipath_boardversion),
+		 "Driver %u.%u, %s, InfiniPath%u %u.%u, PCI %u, "
+		 "SW Compat %u\n",
+		 IPATH_CHIP_VERS_MAJ, IPATH_CHIP_VERS_MIN, boardn,
+		 (unsigned)(dd->ipath_revision >> INFINIPATH_R_ARCH_SHIFT) &
+		 INFINIPATH_R_ARCH_MASK,
+		 dd->ipath_majrev, dd->ipath_minrev, dd->ipath_pcirev,
+		 (unsigned)(dd->ipath_revision >>
+			    INFINIPATH_R_SOFTWARE_SHIFT) &
+		 INFINIPATH_R_SOFTWARE_MASK);
+
+	ipath_dbg("%s", dd->ipath_boardversion);
+
+done:
+	return ret;
+}
+
+
+/**
+ * ipath_init_chip - do the actual initialization sequence on the chip
+ * @dd: the infinipath device
+ * @reinit: reinitializing, so don't allocate new memory
+ *
+ * Do the actual initialization sequence on the chip.  This is done
+ * both from the init routine called from the PCI infrastructure, and
+ * when we reset the chip, or detect that it was reset internally,
+ * or it's administratively re-enabled.
+ *
+ * Memory allocation here and in called routines is only done in
+ * the first case (reinit == 0).  We have to be careful, because even
+ * without memory allocation, we need to re-write all the chip registers
+ * TIDs, etc. after the reset or enable has completed.
+ */
+int ipath_init_chip(struct ipath_devdata *dd, int reinit)
+{
+	int ret = 0, i;
+	u32 val32, kpiobufs;
+	u64 val, atmp;
+	struct ipath_portdata *pd = NULL; /* keep gcc4 happy */
+
+	ret = init_housekeeping(dd, &pd, reinit);
+	if (ret)
+		goto done;
+
+	/*
+	 * we ignore most issues after reporting them, but have to specially
+	 * handle hardware-disabled chips.
+	 */
+	if (ret == 2) {
+		/* unique error, known to ipath_init_one */
+		ret = -EPERM;
+		goto done;
+	}
+
+	/*
+	 * We could bump this to allow for full rcvegrcnt + rcvtidcnt,
+	 * but then it no longer nicely fits power of two, and since
+	 * we now use routines that backend onto __get_free_pages, the
+	 * rest would be wasted.
+	 */
+	dd->ipath_rcvhdrcnt = dd->ipath_rcvegrcnt;
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrcnt,
+			 dd->ipath_rcvhdrcnt);
+
+	/*
+	 * Set up the shadow copies of the piobufavail registers,
+	 * which we compare against the chip registers for now, and
+	 * the in memory DMA'ed copies of the registers.  This has to
+	 * be done early, before we calculate lastport, etc.
+	 */
+	val = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k;
+	/*
+	 * calc number of pioavail registers, and save it; we have 2
+	 * bits per buffer.
+	 */
+	dd->ipath_pioavregs = ALIGN(val, sizeof(u64) * BITS_PER_BYTE / 2)
+		/ (sizeof(u64) * BITS_PER_BYTE / 2);
+	if (!ipath_kpiobufs)	/* have to have at least 1, for SMA */
+		kpiobufs = ipath_kpiobufs = 1;
+	else if ((dd->ipath_piobcnt2k + dd->ipath_piobcnt4k) <
+		 (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT)) {
+		dev_info(&dd->pcidev->dev, "Too few PIO buffers (%u) "
+			 "for %u ports to have %u each!\n",
+			 dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
+			 dd->ipath_cfgports, IPATH_MIN_USER_PORT_BUFCNT);
+		kpiobufs = 1;	/* reserve just the minimum for SMA/ether */
+	} else
+		kpiobufs = ipath_kpiobufs;
+
+	if (kpiobufs >
+	    (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
+	     (dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT))) {
+		i = dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
+			(dd->ipath_cfgports * IPATH_MIN_USER_PORT_BUFCNT);
+		if (i < 0)
+			i = 0;
+		dev_info(&dd->pcidev->dev, "Allocating %d PIO bufs for "
+			 "kernel leaves too few for %d user ports "
+			 "(%d each); using %u\n", kpiobufs,
+			 dd->ipath_cfgports - 1,
+			 IPATH_MIN_USER_PORT_BUFCNT, i);
+		/*
+		 * shouldn't change ipath_kpiobufs, because could be
+		 * different for different devices...
+		 */
+		kpiobufs = i;
+	}
+	dd->ipath_lastport_piobuf =
+		dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - kpiobufs;
+	dd->ipath_pbufsport = dd->ipath_cfgports > 1
+		? dd->ipath_lastport_piobuf / (dd->ipath_cfgports - 1)
+		: 0;
+	val32 = dd->ipath_lastport_piobuf -
+		(dd->ipath_pbufsport * (dd->ipath_cfgports - 1));
+	if (val32 > 0) {
+		ipath_dbg("allocating %u pbufs/port leaves %u unused, "
+			  "add to kernel\n", dd->ipath_pbufsport, val32);
+		dd->ipath_lastport_piobuf -= val32;
+		ipath_dbg("%u pbufs/port leaves %u unused, add to kernel\n",
+			  dd->ipath_pbufsport, val32);
+	}
+	dd->ipath_lastpioindex = dd->ipath_lastport_piobuf;
+	ipath_cdbg(VERBOSE, "%d PIO bufs for kernel out of %d total %u "
+		   "each for %u user ports\n", kpiobufs,
+		   dd->ipath_piobcnt2k + dd->ipath_piobcnt4k,
+		   dd->ipath_pbufsport, dd->ipath_cfgports - 1);
+
+	dd->ipath_f_early_init(dd);
+
+	/* early_init sets rcvhdrentsize and rcvhdrsize, so this must be
+	 * done after early_init */
+	dd->ipath_hdrqlast =
+		dd->ipath_rcvhdrentsize * (dd->ipath_rcvhdrcnt - 1);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrentsize,
+			 dd->ipath_rcvhdrentsize);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvhdrsize,
+			 dd->ipath_rcvhdrsize);
+
+	if (!reinit) {
+		ret = init_pioavailregs(dd);
+		init_shadow_tids(dd);
+		if (ret)
+			goto done;
+	}
+
+	(void)ipath_write_kreg(dd, dd->ipath_kregs->kr_sendpioavailaddr,
+			       dd->ipath_pioavailregs_phys);
+	/*
+	 * this is to detect s/w errors, which the h/w works around by
+	 * ignoring the low 6 bits of address, if it wasn't aligned.
+	 */
+	val = ipath_read_kreg64(dd, dd->ipath_kregs->kr_sendpioavailaddr);
+	if (val != dd->ipath_pioavailregs_phys) {
+		ipath_dev_err(dd, "Catastrophic software error, "
+			      "SendPIOAvailAddr written as %lx, "
+			      "read back as %llx\n",
+			      (unsigned long) dd->ipath_pioavailregs_phys,
+			      (unsigned long long) val);
+		ret = -EINVAL;
+		goto done;
+	}
+
+	val = ipath_port0_rcvhdrtail_dma + dd->ipath_unit * 64;
+
+	/* verify that the alignment requirement was met */
+	ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdrtailaddr,
+			      0, val);
+	atmp = ipath_read_kreg64_port(
+		dd, dd->ipath_kregs->kr_rcvhdrtailaddr, 0);
+	if (val != atmp) {
+		ipath_dev_err(dd, "Catastrophic software error, "
+			      "RcvHdrTailAddr0 written as %llx, "
+			      "read back as %llx from %x\n",
+			      (unsigned long long) val,
+			      (unsigned long long) atmp,
+			      dd->ipath_kregs->kr_rcvhdrtailaddr);
+		ret = -EINVAL;
+		goto done;
+	}
+
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvbthqp, IPATH_KD_QP);
+
+	/*
+	 * make sure we are not in freeze, and PIO send enabled, so
+	 * writes to pbc happen
+	 */
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask, 0ULL);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
+			 ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_control, 0ULL);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
+			 INFINIPATH_S_PIOENABLE);
+
+	/*
+	 * before error clears, since we expect serdes pll errors during
+	 * this, the first time after reset
+	 */
+	if (bringup_link(dd)) {
+		dev_info(&dd->pcidev->dev, "Failed to bringup IB link\n");
+		ret = -ENETDOWN;
+		goto done;
+	}
+
+	/*
+	 * clear any "expected" hwerrs from reset and/or initialization
+	 * clear any that aren't enabled (at least this once), and then
+	 * set the enable mask
+	 */
+	dd->ipath_f_init_hwerrors(dd);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrclear,
+			 ~0ULL&~INFINIPATH_HWE_MEMBISTFAILED);
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_hwerrmask,
+			 dd->ipath_hwerrmask);
+
+	dd->ipath_maskederrs = dd->ipath_ignorederrs;
+	/* clear all */
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_errorclear, -1LL);
+	/* enable errors that are masked, at least this first time. */
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_errormask,
+			 ~dd->ipath_maskederrs);
+	/* clear any interrups up to this point (ints still not enabled) */
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, -1LL);
+
+	ipath_stats.sps_lid[dd->ipath_unit] = dd->ipath_lid;
+
+	/*
+	 * Set up the port 0 (kernel) rcvhdr q and egr TIDs.  If doing
+	 * re-init, the simplest way to handle this is to free
+	 * existing, and re-allocate.
+	 */
+	if (reinit)
+		ipath_free_pddata(dd, 0, 0);
+	dd->ipath_f_tidtemplate(dd);
+	ret = ipath_create_rcvhdrq(dd, pd);
+	if (!ret)
+		ret = create_port0_egr(dd);
+	if (ret)
+		ipath_dev_err(dd, "failed to allocate port 0 (kernel) "
+			      "rcvhdrq and/or egr bufs\n");
+	else
+		enable_chip(dd, pd, reinit);
+
+	/*
+	 * cause retrigger of pending interrupts ignored during init,
+	 * even if we had errors
+	 */
+	ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear, 0ULL);
+
+	if(!dd->ipath_stats_timer_active) {
+		/*
+		 * first init, or after an admin disable/enable
+		 * set up stats retrieval timer, even if we had errors
+		 * in last portion of setup
+		 */
+		init_timer(&dd->ipath_stats_timer);
+		dd->ipath_stats_timer.function = ipath_get_faststats;
+		dd->ipath_stats_timer.data = (unsigned long) dd;
+		/* every 5 seconds; */
+		dd->ipath_stats_timer.expires = jiffies + 5 * HZ;
+		/* takes ~16 seconds to overflow at full IB 4x bandwdith */
+		add_timer(&dd->ipath_stats_timer);
+		dd->ipath_stats_timer_active = 1;
+	}
+
+done:
+	if (!ret) {
+		ipath_get_guid(dd);
+		*dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
+		if (!ipath_sma_data_spare) {
+			/*
+			 * first init, setup SMA data structs
+			 */
+			ipath_sma_data_spare =
+				ipath_sma_data_bufs[IPATH_NUM_SMA_PKTS];
+			for (i = 0; i < IPATH_NUM_SMA_PKTS; i++)
+				ipath_sma_data[i].buf =
+					ipath_sma_data_bufs[i];
+		}
+		if (!dd->ipath_f_intrsetup(dd)) {
+			/* now we can enable all interrupts from the chip */
+			ipath_write_kreg(dd, dd->ipath_kregs->kr_intmask,
+					 -1LL);
+			/* force re-interrupt of any pending interrupts. */
+			ipath_write_kreg(dd, dd->ipath_kregs->kr_intclear,
+					 0ULL);
+			/* chip is usable; mark it as initialized */
+			*dd->ipath_statusp |= IPATH_STATUS_INITTED;
+		} else
+			ipath_dev_err(dd, "No interrupts enabled, couldn't "
+				      "setup interrupt address\n");
+
+		if (dd->ipath_cfgports > ipath_stats.sps_nports)
+			/*
+			 * sps_nports is a global, so, we set it to
+			 * the highest number of ports of any of the
+			 * chips we find; we never decrement it, at
+			 * least for now.  Since this might have changed
+			 * over disable/enable or prior to reset, always
+			 * do the check and potentially adjust.
+			 */
+			ipath_stats.sps_nports = dd->ipath_cfgports;
+	} else
+		ipath_dbg("Failed (%d) to initialize chip\n", ret);
+
+	/* if ret is non-zero, we probably should do some cleanup
+	   here... */
+	return ret;
+}
+
+static int ipath_set_kpiobufs(const char *str, struct kernel_param *kp)
+{
+	struct ipath_devdata *dd;
+	unsigned long flags;
+	unsigned short val;
+	int ret;
+
+	ret = ipath_parse_ushort(str, &val);
+
+	spin_lock_irqsave(&ipath_devs_lock, flags);
+
+	if (ret < 0)
+		goto bail;
+
+	if (val == 0) {
+		ret = -EINVAL;
+		goto bail;
+	}
+
+	list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
+		if (dd->ipath_kregbase)
+			continue;
+		if (val > (dd->ipath_piobcnt2k + dd->ipath_piobcnt4k -
+			   (dd->ipath_cfgports *
+			    IPATH_MIN_USER_PORT_BUFCNT)))
+		{
+			ipath_dev_err(
+				dd,
+				"Allocating %d PIO bufs for kernel leaves "
+				"too few for %d user ports (%d each)\n",
+				val, dd->ipath_cfgports - 1,
+				IPATH_MIN_USER_PORT_BUFCNT);
+			ret = -EINVAL;
+			goto bail;
+		}
+		dd->ipath_lastport_piobuf =
+			dd->ipath_piobcnt2k + dd->ipath_piobcnt4k - val;
+	}
+
+	ret = 0;
+bail:
+	spin_unlock_irqrestore(&ipath_devs_lock, flags);
+
+	return ret;
+}
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