patch-2.4.22 linux-2.4.22/arch/ia64/sn/io/xbow.c

Next file: linux-2.4.22/arch/ia64/sn/io/xswitch.c
Previous file: linux-2.4.22/arch/ia64/sn/io/stubs.c
Back to the patch index
Back to the overall index

diff -urN linux-2.4.21/arch/ia64/sn/io/xbow.c linux-2.4.22/arch/ia64/sn/io/xbow.c
@@ -1,1325 +0,0 @@
-/* $Id$
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License.  See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1992 - 1997, 2000-2001 Silicon Graphics, Inc. All rights reserved.
- */
-
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <asm/sn/sgi.h>
-#include <asm/sn/iograph.h>
-#include <asm/sn/invent.h>
-#include <asm/sn/hcl.h>
-#include <asm/sn/labelcl.h>
-#include <asm/sn/hack.h>
-#include <asm/sn/pci/bridge.h>
-#include <asm/sn/xtalk/xtalk_private.h>
-#include <asm/sn/simulator.h>
-
-/* #define DEBUG		1 */
-/* #define XBOW_DEBUG	1 */
-
-
-/*
- * Files needed to get the device driver entry points
- */
-
-#include <asm/sn/xtalk/xbow.h>
-#include <asm/sn/xtalk/xtalk.h>
-#include <asm/sn/xtalk/xswitch.h>
-#include <asm/sn/xtalk/xwidget.h>
-
-#include <asm/sn/prio.h>
-#include <asm/sn/hcl_util.h>
-
-
-#define NEW(ptr)	(ptr = kmalloc(sizeof (*(ptr)), GFP_KERNEL))
-#define DEL(ptr)	(kfree(ptr))
-
-int                     xbow_devflag = D_MP;
-
-/*
- * This file supports the Xbow chip.  Main functions: initializtion,
- * error handling, and GBR.
- */
-
-/*
- * each vertex corresponding to an xbow chip
- * has a "fastinfo" pointer pointing at one
- * of these things.
- */
-typedef struct xbow_soft_s *xbow_soft_t;
-
-struct xbow_soft_s {
-    devfs_handle_t            conn;	/* our connection point */
-    devfs_handle_t            vhdl;	/* xbow's private vertex */
-    devfs_handle_t            busv;	/* the xswitch vertex */
-    xbow_t                 *base;	/* PIO pointer to crossbow chip */
-    char                   *name;	/* hwgraph name */
-
-    xbow_perf_t             xbow_perfcnt[XBOW_PERF_COUNTERS];
-    xbow_perf_link_t        xbow_perflink[MAX_XBOW_PORTS];
-    xbow_link_status_t      xbow_link_status[MAX_XBOW_PORTS];
-    spinlock_t              xbow_perf_lock;
-    int                     link_monitor;
-    widget_cfg_t	   *wpio[MAX_XBOW_PORTS];	/* cached PIO pointer */
-
-    /* Bandwidth allocation state. Bandwidth values are for the
-     * destination port since contention happens there.
-     * Implicit mapping from xbow ports (8..f) -> (0..7) array indices.
-     */
-    spinlock_t		    xbow_bw_alloc_lock;		/* bw allocation lock */
-    unsigned long long	    bw_hiwm[MAX_XBOW_PORTS];	/* hiwater mark values */
-    unsigned long long      bw_cur_used[MAX_XBOW_PORTS]; /* bw used currently */
-};
-
-#define xbow_soft_set(v,i)	hwgraph_fastinfo_set((v), (arbitrary_info_t)(i))
-#define xbow_soft_get(v)	((xbow_soft_t)hwgraph_fastinfo_get((v)))
-
-/*
- * Function Table of Contents
- */
-
-void                    xbow_mlreset(xbow_t *);
-void                    xbow_init(void);
-int                     xbow_attach(devfs_handle_t);
-
-int                     xbow_open(devfs_handle_t *, int, int, cred_t *);
-int                     xbow_close(devfs_handle_t, int, int, cred_t *);
-
-int                     xbow_map(devfs_handle_t, vhandl_t *, off_t, size_t, uint);
-int                     xbow_unmap(devfs_handle_t, vhandl_t *);
-int                     xbow_ioctl(devfs_handle_t, int, void *, int, struct cred *, int *);
-
-int                     xbow_widget_present(xbow_t *, int);
-static int              xbow_link_alive(xbow_t *, int);
-devfs_handle_t            xbow_widget_lookup(devfs_handle_t, int);
-
-#ifdef LATER
-static void             xbow_setwidint(xtalk_intr_t);
-static void             xbow_errintr_handler(intr_arg_t);
-#endif
-void                    xbow_intr_preset(void *, int, xwidgetnum_t, iopaddr_t, xtalk_intr_vector_t);
-
-
-
-void                    xbow_update_perf_counters(devfs_handle_t);
-xbow_perf_link_t       *xbow_get_perf_counters(devfs_handle_t);
-int                     xbow_enable_perf_counter(devfs_handle_t, int, int, int);
-xbow_link_status_t     *xbow_get_llp_status(devfs_handle_t);
-void                    xbow_update_llp_status(devfs_handle_t);
-
-int                     xbow_disable_llp_monitor(devfs_handle_t);
-int                     xbow_enable_llp_monitor(devfs_handle_t);
-int                     xbow_prio_bw_alloc(devfs_handle_t, xwidgetnum_t, xwidgetnum_t,
-                                unsigned long long, unsigned long long);
-
-xswitch_reset_link_f    xbow_reset_link;
-
-void                    idbg_xbowregs(int64_t);
-
-xswitch_provider_t      xbow_provider =
-{
-    xbow_reset_link,
-};
-
-/*
- *    xbow_mlreset: called at mlreset time if the
- *      platform specific code determines that there is
- *      a crossbow in a critical path that must be
- *      functional before the driver would normally get
- *      the device properly set up.
- *
- *      what do we need to do, that the boot prom can
- *      not be counted on to have already done, that is
- *      generic across all platforms using crossbows?
- */
-/*ARGSUSED */
-void
-xbow_mlreset(xbow_t * xbow)
-{
-}
-
-/*
- *    xbow_init: called with the rest of the device
- *      driver XXX_init routines. This platform *might*
- *      have a Crossbow chip, or even several, but it
- *      might have none. Register with the crosstalk
- *      generic provider so when we encounter the chip
- *      the right magic happens.
- */
-void
-xbow_init(void)
-{
-
-#if DEBUG && ATTACH_DEBUG
-    printf("xbow_init\n");
-#endif
-
-    xwidget_driver_register(XXBOW_WIDGET_PART_NUM,
-			    0, /* XXBOW_WIDGET_MFGR_NUM, */
-			    "xbow_",
-			    CDL_PRI_HI);	/* attach before friends */
-
-    xwidget_driver_register(XBOW_WIDGET_PART_NUM,
-			    XBOW_WIDGET_MFGR_NUM,
-			    "xbow_",
-			    CDL_PRI_HI);	/* attach before friends */
-}
-
-#ifdef XBRIDGE_REGS_SIM
-/*    xbow_set_simulated_regs: sets xbow regs as needed
- *	for powering through the boot
- */
-void
-xbow_set_simulated_regs(xbow_t *xbow, int port)
-{
-    /*
-     * turn on link
-     */
-    xbow->xb_link(port).link_status = (1<<31);
-    /*
-     * and give it a live widget too
-     */
-    xbow->xb_link(port).link_aux_status = XB_AUX_STAT_PRESENT;
-    /*
-     * zero the link control reg
-     */
-    xbow->xb_link(port).link_control = 0x0;
-}
-#endif /* XBRIDGE_REGS_SIM */
-
-/*
- *    xbow_attach: the crosstalk provider has
- *      determined that there is a crossbow widget
- *      present, and has handed us the connection
- *      point for that vertex.
- *
- *      We not only add our own vertex, but add
- *      some "xtalk switch" data to the switch
- *      vertex (at the connect point's parent) if
- *      it does not have any.
- */
-
-/*ARGSUSED */
-int
-xbow_attach(devfs_handle_t conn)
-{
-    /*REFERENCED */
-    devfs_handle_t            vhdl;
-    devfs_handle_t            busv;
-    xbow_t                 *xbow;
-    xbow_soft_t             soft;
-    int                     port;
-    xswitch_info_t          info;
-#ifdef LATER
-    xtalk_intr_t            intr_hdl;
-    device_desc_t           dev_desc;
-#endif
-    char                    devnm[MAXDEVNAME], *s;
-    xbowreg_t               id;
-    int                     rev;
-    int			    i;
-    int			    xbow_num;
-	
-#if DEBUG && ATTACH_DEBUG
-#if defined(SUPPORT_PRINTING_V_FORMAT
-    printk("%v: xbow_attach\n", conn);
-#else
-    printk("0x%x: xbow_attach\n", conn);
-#endif
-#endif
-
-    /*
-     * Get a PIO pointer to the base of the crossbow
-     * chip.
-     */
-#ifdef XBRIDGE_REGS_SIM
-    printk("xbow_attach: XBRIDGE_REGS_SIM FIXME: allocating %ld bytes for xbow_s\n", sizeof(xbow_t));
-    xbow = (xbow_t *) kmalloc(sizeof(xbow_t), GFP_KERNEL);
-    /*
-     * turn on ports e and f like in a real live ibrick
-     */
-    xbow_set_simulated_regs(xbow, 0xe);
-    xbow_set_simulated_regs(xbow, 0xf);
-#else
-    xbow = (xbow_t *) xtalk_piotrans_addr(conn, 0, 0, sizeof(xbow_t), 0);
-#endif /* XBRIDGE_REGS_SIM */
-
-    /*
-     * Locate the "switch" vertex: it is the parent
-     * of our connection point.
-     */
-    busv = hwgraph_connectpt_get(conn);
-#if DEBUG && ATTACH_DEBUG
-    printk("xbow_attach: Bus Vertex 0x%p, conn 0x%p, xbow register 0x%p wid= 0x%x\n", busv, conn, xbow, *(volatile u32 *)xbow);
-#endif
-
-    ASSERT(busv != GRAPH_VERTEX_NONE);
-
-    /*
-     * Create our private vertex, and connect our
-     * driver information to it. This makes it possible
-     * for diagnostic drivers to open the crossbow
-     * vertex for access to registers.
-     */
-
-    /*
-     * We need to teach xbow drivers to provide the right set of
-     * file ops.
-     */
-    vhdl = NULL;
-    vhdl = hwgraph_register(conn, EDGE_LBL_XBOW,
-                        0, DEVFS_FL_AUTO_DEVNUM,
-                        0, 0,
-                        S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 0, 0,
-                        /* &hcl_fops */ (void *)&vhdl, NULL);
-    if (!vhdl) {
-        printk(KERN_WARNING "xbow_attach: Unable to create char device for xbow conn %p\n",
-                (void *)conn);
-    }
-
-    /*
-     * Allocate the soft state structure and attach
-     * it to the xbow's vertex
-     */
-    NEW(soft);
-    soft->conn = conn;
-    soft->vhdl = vhdl;
-    soft->busv = busv;
-    soft->base = xbow;
-    /* does the universe really need another macro?  */
-    /* xbow_soft_set(vhdl, (arbitrary_info_t) soft); */
-    hwgraph_fastinfo_set(vhdl, (arbitrary_info_t) soft);
-
-#define XBOW_NUM_SUFFIX_FORMAT	"[xbow# %d]"
-
-    /* Add xbow number as a suffix to the hwgraph name of the xbow.
-     * This is helpful while looking at the error/warning messages.
-     */
-    xbow_num = 0;
-
-    /*
-     * get the name of this xbow vertex and keep the info.
-     * This is needed during errors and interupts, but as
-     * long as we have it, we can use it elsewhere.
-     */
-    s = dev_to_name(vhdl, devnm, MAXDEVNAME);
-    soft->name = kmalloc(strlen(s) + strlen(XBOW_NUM_SUFFIX_FORMAT) + 1, 
-			    GFP_KERNEL);
-    sprintf(soft->name,"%s"XBOW_NUM_SUFFIX_FORMAT, s,xbow_num);
-
-#ifdef XBRIDGE_REGS_SIM
-    /* my o200/ibrick has id=0x2d002049, but XXBOW_WIDGET_PART_NUM is defined
-     * as 0xd000, so I'm using that for the partnum bitfield.
-     */
-    printk("xbow_attach: XBRIDGE_REGS_SIM FIXME: need xb_wid_id value!!\n");
-    id = 0x2d000049;
-#else
-    id = xbow->xb_wid_id;
-#endif /* XBRIDGE_REGS_SIM */
-    rev = XWIDGET_PART_REV_NUM(id);
-
-    /*
-     * Print the revision if DEBUG, or SHOW_REVS and kdebug,
-     * or the xbow is downrev.
-     *
-     * If xbow is downrev, make it a WARNING that the
-     * Crossbow is DOWNREV: these chips are not good
-     * to have around, and the operator should be told.
-     */
-#ifdef	LATER
-#if !DEBUG
-    if (
-#if SHOW_REVS
-	   (kdebug) ||
-#endif	/* SHOW_REVS */
-	   (rev < XBOW_REV_1_1))
-#endif	/* !DEBUG  */
-	printk("%sCrossbow ASIC: rev %s (code=%d) at %s%s",
-		(rev < XBOW_REV_1_1) ? "DOWNREV " : "",
-		(rev == XBOW_REV_1_0) ? "1.0" :
-		(rev == XBOW_REV_1_1) ? "1.1" :
-		(rev == XBOW_REV_1_2) ? "1.2" :
-		(rev == XBOW_REV_1_3) ? "1.3" :
-		(rev == XBOW_REV_2_0) ? "2.0" :
-		(rev == XXBOW_PART_REV_1_0) ? "Xbridge 1.0" :
-		(rev == XXBOW_PART_REV_2_0) ? "Xbridge 2.0" :
-		"unknown",
-		rev, soft->name,
-		(rev < XBOW_REV_1_1) ? "" : "\n");
-#endif	/* LATER */
-    mutex_spinlock_init(&soft->xbow_perf_lock);
-    soft->xbow_perfcnt[0].xp_perf_reg = &xbow->xb_perf_ctr_a;
-    soft->xbow_perfcnt[1].xp_perf_reg = &xbow->xb_perf_ctr_b;
-
-    /* Initialization for GBR bw allocation */
-    mutex_spinlock_init(&soft->xbow_bw_alloc_lock);
-
-#define	XBOW_8_BIT_PORT_BW_MAX		(400 * 1000 * 1000)	/* 400 MB/s */
-#define XBOW_16_BIT_PORT_BW_MAX		(800 * 1000 * 1000)	/* 800 MB/s */
-
-    /* Set bandwidth hiwatermark and current values */
-    for (i = 0; i < MAX_XBOW_PORTS; i++) {
-	soft->bw_hiwm[i] = XBOW_16_BIT_PORT_BW_MAX;	/* for now */
-	soft->bw_cur_used[i] = 0;
-    }
-
-    /*
-     * Enable xbow error interrupts
-     */
-    xbow->xb_wid_control = (XB_WID_CTRL_REG_ACC_IE | XB_WID_CTRL_XTALK_IE);
-
-    /*
-     * take a census of the widgets present,
-     * leaving notes at the switch vertex.
-     */
-    info = xswitch_info_new(busv);
-
-    for (port = MAX_PORT_NUM - MAX_XBOW_PORTS;
-	 port < MAX_PORT_NUM; ++port) {
-	if (!xbow_link_alive(xbow, port)) {
-#if DEBUG && XBOW_DEBUG
-	    printk(KERN_INFO "0x%p link %d is not alive\n",
-		    busv, port);
-#endif
-	    continue;
-	}
-	if (!xbow_widget_present(xbow, port)) {
-#if DEBUG && XBOW_DEBUG
-	    printk(KERN_INFO "0x%p link %d is alive but no widget is present\n", busv, port);
-#endif
-	    continue;
-	}
-#if DEBUG && XBOW_DEBUG
-	printk(KERN_INFO "0x%p link %d has a widget\n",
-		busv, port);
-#endif
-
-	xswitch_info_link_is_ok(info, port);
-	/*
-	 * Turn some error interrupts on
-	 * and turn others off. The PROM has
-	 * some things turned on we don't
-	 * want to see (bandwidth allocation
-	 * errors for instance); so if it
-	 * is not listed here, it is not on.
-	 */
-	xbow->xb_link(port).link_control =
-	    ( (xbow->xb_link(port).link_control
-	/*
-	 * Turn off these bits; they are non-fatal,
-	 * but we might want to save some statistics
-	 * on the frequency of these errors.
-	 * XXX FIXME XXX
-	 */
-	    & ~XB_CTRL_RCV_CNT_OFLOW_IE
-	    & ~XB_CTRL_XMT_CNT_OFLOW_IE
-	    & ~XB_CTRL_BNDWDTH_ALLOC_IE
-	    & ~XB_CTRL_RCV_IE)
-	/*
-	 * These are the ones we want to turn on.
-	 */
-	    | (XB_CTRL_ILLEGAL_DST_IE
-	    | XB_CTRL_OALLOC_IBUF_IE
-	    | XB_CTRL_XMT_MAX_RTRY_IE
-	    | XB_CTRL_MAXREQ_TOUT_IE
-	    | XB_CTRL_XMT_RTRY_IE
-	    | XB_CTRL_SRC_TOUT_IE) );
-    }
-
-    xswitch_provider_register(busv, &xbow_provider);
-
-    return 0;				/* attach successful */
-}
-
-/*ARGSUSED */
-int
-xbow_open(devfs_handle_t *devp, int oflag, int otyp, cred_t *credp)
-{
-    return 0;
-
-}
-
-/*ARGSUSED */
-int
-xbow_close(devfs_handle_t dev, int oflag, int otyp, cred_t *crp)
-{
-    return 0;
-}
-
-/*ARGSUSED */
-int
-xbow_map(devfs_handle_t dev, vhandl_t *vt, off_t off, size_t len, uint prot)
-{
-    devfs_handle_t            vhdl = dev_to_vhdl(dev);
-    xbow_soft_t             soft = xbow_soft_get(vhdl);
-    int                     error;
-
-    ASSERT(soft);
-    len = ctob(btoc(len));
-    /* XXX- this ignores the offset!!! */
-    error = v_mapphys(vt, (void *) soft->base, len);
-    return error;
-}
-
-/*ARGSUSED */
-int
-xbow_unmap(devfs_handle_t dev, vhandl_t *vt)
-{
-    return 0;
-}
-
-/* This contains special-case code for grio. There are plans to make
- * this general sometime in the future, but till then this should
- * be good enough.
- */
-xwidgetnum_t
-xbow_widget_num_get(devfs_handle_t dev)
-{
-	devfs_handle_t	tdev;
-	char		devname[MAXDEVNAME];
-	xwidget_info_t	xwidget_info;
-	int		i;
-
-	vertex_to_name(dev, devname, MAXDEVNAME);
-
-	/* If this is a pci controller vertex, traverse up using
-	 * the ".." links to get to the widget.
-	 */
-	if (strstr(devname, EDGE_LBL_PCI) &&
-			strstr(devname, EDGE_LBL_CONTROLLER)) {
-		tdev = dev;
-		for (i=0; i< 2; i++) {
-			if (hwgraph_edge_get(tdev,
-				HWGRAPH_EDGELBL_DOTDOT, &tdev) !=
-					GRAPH_SUCCESS)
-				return XWIDGET_NONE;
-		}
-
-		if ((xwidget_info = xwidget_info_chk(tdev)) != NULL) {
-			return (xwidget_info_id_get(xwidget_info));
-		} else {
-			return XWIDGET_NONE;
-		}
-	}
-
-	return XWIDGET_NONE;
-}
-
-int
-xbow_ioctl(devfs_handle_t dev,
-	   int cmd,
-	   void *arg,
-	   int flag,
-	   struct cred *cr,
-	   int *rvalp)
-{
-    devfs_handle_t            vhdl;
-    int                     error = 0;
-
-#if defined (DEBUG)
-    int                     rc;
-    devfs_handle_t            conn;
-    struct xwidget_info_s  *xwidget_info;
-    xbow_soft_t             xbow_soft;
-#endif
-    *rvalp = 0;
-
-    vhdl = dev_to_vhdl(dev);
-#if defined (DEBUG)
-    xbow_soft = xbow_soft_get(vhdl);
-    conn = xbow_soft->conn;
-
-    xwidget_info = xwidget_info_get(conn);
-    ASSERT_ALWAYS(xwidget_info != NULL);
-
-    rc = xwidget_hwid_is_xswitch(&xwidget_info->w_hwid);
-    ASSERT_ALWAYS(rc != 0);
-#endif
-    switch (cmd) {
-#ifdef LATER
-    case XBOWIOC_PERF_ENABLE:
-    case XBOWIOC_PERF_DISABLE:
-	{
-	    struct xbow_perfarg_t   xbow_perf_en;
-
-	    if (!_CAP_CRABLE(cr, CAP_DEVICE_MGT)) {
-		error = EPERM;
-		break;
-	    }
-	    if ((flag & FWRITE) == 0) {
-		error = EBADF;
-		break;
-	    }
-	    if (COPYIN(arg, &xbow_perf_en, sizeof(xbow_perf_en))) {
-		error = EFAULT;
-		break;
-	    }
-	    if (error = xbow_enable_perf_counter(vhdl,
-						 xbow_perf_en.link,
-						 (cmd == XBOWIOC_PERF_DISABLE) ? 0 : xbow_perf_en.mode,
-						 xbow_perf_en.counter)) {
-		error = EINVAL;
-		break;
-	    }
-	    break;
-	}
-#endif
-
-#ifdef LATER
-    case XBOWIOC_PERF_GET:
-	{
-	    xbow_perf_link_t       *xbow_perf_cnt;
-
-	    if ((flag & FREAD) == 0) {
-		error = EBADF;
-		break;
-	    }
-	    xbow_perf_cnt = xbow_get_perf_counters(vhdl);
-	    ASSERT_ALWAYS(xbow_perf_cnt != NULL);
-
-	    if (COPYOUT((void *) xbow_perf_cnt, (void *) arg,
-			MAX_XBOW_PORTS * sizeof(xbow_perf_link_t))) {
-		error = EFAULT;
-		break;
-	    }
-	    break;
-	}
-#endif
-
-    case XBOWIOC_LLP_ERROR_ENABLE:
-	if ((error = xbow_enable_llp_monitor(vhdl)) != 0)
-	    error = EINVAL;
-
-	break;
-
-    case XBOWIOC_LLP_ERROR_DISABLE:
-
-	if ((error = xbow_disable_llp_monitor(vhdl)) != 0)
-	    error = EINVAL;
-
-	break;
-
-#ifdef LATER
-    case XBOWIOC_LLP_ERROR_GET:
-	{
-	    xbow_link_status_t     *xbow_llp_status;
-
-	    if ((flag & FREAD) == 0) {
-		error = EBADF;
-		break;
-	    }
-	    xbow_llp_status = xbow_get_llp_status(vhdl);
-	    ASSERT_ALWAYS(xbow_llp_status != NULL);
-
-	    if (COPYOUT((void *) xbow_llp_status, (void *) arg,
-			MAX_XBOW_PORTS * sizeof(xbow_link_status_t))) {
-		error = EFAULT;
-		break;
-	    }
-	    break;
-	}
-#endif
-
-#ifdef LATER
-    case GIOCSETBW:
-	{
-	    grio_ioctl_info_t info;
-	    xwidgetnum_t src_widgetnum, dest_widgetnum;
-
-	    if (COPYIN(arg, &info, sizeof(grio_ioctl_info_t))) {
-		error = EFAULT;
-		break;
-	    }
-#ifdef GRIO_DEBUG
-	    printf("xbow:: prev_vhdl: %d next_vhdl: %d reqbw: %lld\n",
-			info.prev_vhdl, info.next_vhdl, info.reqbw);
-#endif /* GRIO_DEBUG */
-
-	    src_widgetnum = xbow_widget_num_get(info.prev_vhdl);
-	    dest_widgetnum = xbow_widget_num_get(info.next_vhdl);
-
-	    /* Bandwidth allocation is bi-directional. Since bandwidth
-	     * reservations have already been done at an earlier stage,
-	     * we cannot fail here for lack of bandwidth.
-	     */
-	    xbow_prio_bw_alloc(dev, src_widgetnum, dest_widgetnum,
-			0, info.reqbw);
-	    xbow_prio_bw_alloc(dev, dest_widgetnum, src_widgetnum,
-			0, info.reqbw);
-
-	    break;
-	}
-
-    case GIOCRELEASEBW:
-	{
-	    grio_ioctl_info_t info;
-	    xwidgetnum_t src_widgetnum, dest_widgetnum;
-
-	    if (!cap_able(CAP_DEVICE_MGT)) {
-		error = EPERM;
-		break;
-	    }
-
-	    if (COPYIN(arg, &info, sizeof(grio_ioctl_info_t))) {
-		error = EFAULT;
-		break;
-	    }
-#ifdef GRIO_DEBUG
-	    printf("xbow:: prev_vhdl: %d next_vhdl: %d reqbw: %lld\n",
-			info.prev_vhdl, info.next_vhdl, info.reqbw);
-#endif /* GRIO_DEBUG */
-
-	    src_widgetnum = xbow_widget_num_get(info.prev_vhdl);
-	    dest_widgetnum = xbow_widget_num_get(info.next_vhdl);
-
-	    /* Bandwidth reservation is bi-directional. Hence, remove
-	     * bandwidth reservations for both directions.
-	     */
-	    xbow_prio_bw_alloc(dev, src_widgetnum, dest_widgetnum,
-			info.reqbw, (-1 * info.reqbw));
-	    xbow_prio_bw_alloc(dev, dest_widgetnum, src_widgetnum,
-			info.reqbw, (-1 * info.reqbw));
-
-	    break;
-	}
-#endif
-
-    default:
-	break;
-
-    }
-    return error;
-}
-
-/*
- * xbow_widget_present: See if a device is present
- * on the specified port of this crossbow.
- */
-int
-xbow_widget_present(xbow_t * xbow, int port)
-{
-	if ( IS_RUNNING_ON_SIMULATOR() ) {
-		if ( (port == 14) || (port == 15) ) {
-			return 1;
-		}
-		else {
-			return 0;
-		}
-	}
-	else {
-		return xbow->xb_link(port).link_aux_status & XB_AUX_STAT_PRESENT;
-	}
-}
-
-static int
-xbow_link_alive(xbow_t * xbow, int port)
-{
-    xbwX_stat_t             xbow_linkstat;
-
-    xbow_linkstat.linkstatus = xbow->xb_link(port).link_status;
-    return (xbow_linkstat.link_alive);
-}
-
-/*
- * xbow_widget_lookup
- *      Lookup the edges connected to the xbow specified, and
- *      retrieve the handle corresponding to the widgetnum
- *      specified.
- *      If not found, return 0.
- */
-devfs_handle_t
-xbow_widget_lookup(devfs_handle_t vhdl,
-		   int widgetnum)
-{
-    xswitch_info_t          xswitch_info;
-    devfs_handle_t            conn;
-
-    xswitch_info = xswitch_info_get(vhdl);
-    conn = xswitch_info_vhdl_get(xswitch_info, widgetnum);
-    return conn;
-}
-
-/*
- * xbow_setwidint: called when xtalk
- * is establishing or migrating our
- * interrupt service.
- */
-#ifdef LATER
-static void
-xbow_setwidint(xtalk_intr_t intr)
-{
-    xwidgetnum_t            targ = xtalk_intr_target_get(intr);
-    iopaddr_t               addr = xtalk_intr_addr_get(intr);
-    xtalk_intr_vector_t     vect = xtalk_intr_vector_get(intr);
-    xbow_t                 *xbow = (xbow_t *) xtalk_intr_sfarg_get(intr);
-
-    xbow_intr_preset((void *) xbow, 0, targ, addr, vect);
-}
-#endif	/* LATER */
-
-/*
- * xbow_intr_preset: called during mlreset time
- * if the platform specific code needs to route
- * an xbow interrupt before the xtalk infrastructure
- * is available for use.
- *
- * Also called from xbow_setwidint, so we don't
- * replicate the guts of the routine.
- *
- * XXX- probably should be renamed xbow_wid_intr_set or
- * something to reduce confusion.
- */
-/*ARGSUSED3 */
-void
-xbow_intr_preset(void *which_widget,
-		 int which_widget_intr,
-		 xwidgetnum_t targ,
-		 iopaddr_t addr,
-		 xtalk_intr_vector_t vect)
-{
-    xbow_t                 *xbow = (xbow_t *) which_widget;
-
-    xbow->xb_wid_int_upper = ((0xFF000000 & (vect << 24)) |
-			      (0x000F0000 & (targ << 16)) |
-			      XTALK_ADDR_TO_UPPER(addr));
-    xbow->xb_wid_int_lower = XTALK_ADDR_TO_LOWER(addr);
-}
-
-#define	XEM_ADD_STR(s)		printk("%s", (s))
-#define	XEM_ADD_NVAR(n,v)	printk("\t%20s: 0x%x\n", (n), (v))
-#define	XEM_ADD_VAR(v)		XEM_ADD_NVAR(#v,(v))
-#define XEM_ADD_IOEF(n) 	if (IOERROR_FIELDVALID(ioe,n))		    \
-				    XEM_ADD_NVAR("ioe." #n,		    \
-						 IOERROR_GETVALUE(ioe,n))
-
-#ifdef LATER
-static void
-xem_add_ioe(ioerror_t *ioe)
-{
-    XEM_ADD_IOEF(errortype);
-    XEM_ADD_IOEF(widgetnum);
-    XEM_ADD_IOEF(widgetdev);
-    XEM_ADD_IOEF(srccpu);
-    XEM_ADD_IOEF(srcnode);
-    XEM_ADD_IOEF(errnode);
-    XEM_ADD_IOEF(sysioaddr);
-    XEM_ADD_IOEF(xtalkaddr);
-    XEM_ADD_IOEF(busspace);
-    XEM_ADD_IOEF(busaddr);
-    XEM_ADD_IOEF(vaddr);
-    XEM_ADD_IOEF(memaddr);
-    XEM_ADD_IOEF(epc);
-    XEM_ADD_IOEF(ef);
-}
-
-#define XEM_ADD_IOE()	(xem_add_ioe(ioe))
-#endif	/* LATER */
-
-int                     xbow_xmit_retry_errors = 0;
-
-int
-xbow_xmit_retry_error(xbow_soft_t soft,
-		      int port)
-{
-    xswitch_info_t          info;
-    devfs_handle_t            vhdl;
-    widget_cfg_t           *wid;
-    widgetreg_t             id;
-    int                     part;
-    int                     mfgr;
-
-    wid = soft->wpio[port - BASE_XBOW_PORT];
-    if (wid == NULL) {
-	/* If we can't track down a PIO
-	 * pointer to our widget yet,
-	 * leave our caller knowing that
-	 * we are interested in this
-	 * interrupt if it occurs in
-	 * the future.
-	 */
-	info = xswitch_info_get(soft->busv);
-	if (!info)
-	    return 1;
-	vhdl = xswitch_info_vhdl_get(info, port);
-	if (vhdl == GRAPH_VERTEX_NONE)
-	    return 1;
-	wid = (widget_cfg_t *) xtalk_piotrans_addr
-	    (vhdl, 0, 0, sizeof *wid, 0);
-	if (!wid)
-	    return 1;
-	soft->wpio[port - BASE_XBOW_PORT] = wid;
-    }
-    id = wid->w_id;
-    part = XWIDGET_PART_NUM(id);
-    mfgr = XWIDGET_MFG_NUM(id);
-
-    /* If this thing is not a Bridge,
-     * do not activate the WAR, and
-     * tell our caller we do not need
-     * to be called again.
-     */
-    if ((part != BRIDGE_WIDGET_PART_NUM) ||
-	(mfgr != BRIDGE_WIDGET_MFGR_NUM)) {
-		/* FIXME: add Xbridge to the WAR.
-		 * Shouldn't hurt anything.  Later need to
-		 * check if we can remove this.
-                 */
-    		if ((part != XBRIDGE_WIDGET_PART_NUM) ||
-		    (mfgr != XBRIDGE_WIDGET_MFGR_NUM))
-			return 0;
-    }
-
-    /* count how many times we
-     * have picked up after
-     * LLP Transmit problems.
-     */
-    xbow_xmit_retry_errors++;
-
-    /* rewrite the control register
-     * to fix things up.
-     */
-    wid->w_control = wid->w_control;
-    wid->w_control;
-
-    return 1;
-}
-
-void
-xbow_update_perf_counters(devfs_handle_t vhdl)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-    xbow_perf_t            *xbow_perf = xbow_soft->xbow_perfcnt;
-    xbow_perf_link_t       *xbow_plink = xbow_soft->xbow_perflink;
-    xbow_perfcount_t        perf_reg;
-    unsigned long           s;
-    int                     link, i;
-
-    for (i = 0; i < XBOW_PERF_COUNTERS; i++, xbow_perf++) {
-	if (xbow_perf->xp_mode == XBOW_MONITOR_NONE)
-	    continue;
-
-	s = mutex_spinlock(&xbow_soft->xbow_perf_lock);
-
-	perf_reg.xb_counter_val = *(xbowreg_t *) xbow_perf->xp_perf_reg;
-
-	link = perf_reg.xb_perf.link_select;
-
-	(xbow_plink + link)->xlp_cumulative[xbow_perf->xp_curmode] +=
-	    ((perf_reg.xb_perf.count - xbow_perf->xp_current) & XBOW_COUNTER_MASK);
-	xbow_perf->xp_current = perf_reg.xb_perf.count;
-
-	mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
-    }
-    /* Do port /mode multiplexing here */
-
-#ifdef LATER
-    (void) timeout(xbow_update_perf_counters,
-		   (void *) (__psunsigned_t) vhdl, XBOW_PERF_TIMEOUT);
-#endif
-
-}
-
-xbow_perf_link_t       *
-xbow_get_perf_counters(devfs_handle_t vhdl)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-    xbow_perf_link_t       *xbow_perf_link = xbow_soft->xbow_perflink;
-
-    return xbow_perf_link;
-}
-
-int
-xbow_enable_perf_counter(devfs_handle_t vhdl, int link, int mode, int counter)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-    xbow_perf_t            *xbow_perf = xbow_soft->xbow_perfcnt;
-    xbow_linkctrl_t         xbow_link_ctrl;
-    xbow_t                 *xbow = xbow_soft->base;
-    xbow_perfcount_t        perf_reg;
-    unsigned long           s;
-    int                     i;
-
-    link -= BASE_XBOW_PORT;
-    if ((link < 0) || (link >= MAX_XBOW_PORTS))
-	return -1;
-
-    if ((mode < XBOW_MONITOR_NONE) || (mode > XBOW_MONITOR_DEST_LINK))
-	return -1;
-
-    if ((counter < 0) || (counter >= XBOW_PERF_COUNTERS))
-	return -1;
-
-    s = mutex_spinlock(&xbow_soft->xbow_perf_lock);
-
-    if ((xbow_perf + counter)->xp_mode && mode) {
-	mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
-	return -1;
-    }
-    for (i = 0; i < XBOW_PERF_COUNTERS; i++) {
-	if (i == counter)
-	    continue;
-	if (((xbow_perf + i)->xp_link == link) &&
-	    ((xbow_perf + i)->xp_mode)) {
-	    mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
-	    return -1;
-	}
-    }
-    xbow_perf += counter;
-
-    xbow_perf->xp_curlink = xbow_perf->xp_link = link;
-    xbow_perf->xp_curmode = xbow_perf->xp_mode = mode;
-
-    xbow_link_ctrl.xbl_ctrlword = xbow->xb_link_raw[link].link_control;
-    xbow_link_ctrl.xb_linkcontrol.perf_mode = mode;
-    xbow->xb_link_raw[link].link_control = xbow_link_ctrl.xbl_ctrlword;
-
-    perf_reg.xb_counter_val = *(xbowreg_t *) xbow_perf->xp_perf_reg;
-    perf_reg.xb_perf.link_select = link;
-    *(xbowreg_t *) xbow_perf->xp_perf_reg = perf_reg.xb_counter_val;
-    xbow_perf->xp_current = perf_reg.xb_perf.count;
-
-#ifdef LATER
-    (void) timeout(xbow_update_perf_counters,
-		   (void *) (__psunsigned_t) vhdl, XBOW_PERF_TIMEOUT);
-#endif
-
-    mutex_spinunlock(&xbow_soft->xbow_perf_lock, s);
-
-    return 0;
-}
-
-xbow_link_status_t     *
-xbow_get_llp_status(devfs_handle_t vhdl)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-    xbow_link_status_t     *xbow_llp_status = xbow_soft->xbow_link_status;
-
-    return xbow_llp_status;
-}
-
-void
-xbow_update_llp_status(devfs_handle_t vhdl)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-    xbow_link_status_t     *xbow_llp_status = xbow_soft->xbow_link_status;
-    xbow_t                 *xbow;
-    xbwX_stat_t             lnk_sts;
-    xbow_aux_link_status_t  aux_sts;
-    int                     link;
-    devfs_handle_t	    xwidget_vhdl;
-    char		   *xwidget_name;	
-
-    xbow = (xbow_t *) xbow_soft->base;
-    for (link = 0; link < MAX_XBOW_PORTS; link++, xbow_llp_status++) {
-	/* Get the widget name corresponding the current link.
-	 * Note : 0 <= link < MAX_XBOW_PORTS(8).
-	 * 	  BASE_XBOW_PORT(0x8) <= xwidget number < MAX_PORT_NUM (0x10)
-	 */
-	xwidget_vhdl = xbow_widget_lookup(xbow_soft->busv,link+BASE_XBOW_PORT);
-	xwidget_name = xwidget_name_get(xwidget_vhdl);
-	aux_sts.aux_linkstatus
-	    = xbow->xb_link_raw[link].link_aux_status;
-	lnk_sts.linkstatus = xbow->xb_link_raw[link].link_status_clr;
-
-	if (lnk_sts.link_alive == 0)
-	    continue;
-
-	xbow_llp_status->rx_err_count +=
-	    aux_sts.xb_aux_linkstatus.rx_err_cnt;
-
-	xbow_llp_status->tx_retry_count +=
-	    aux_sts.xb_aux_linkstatus.tx_retry_cnt;
-
-	if (lnk_sts.linkstatus & ~(XB_STAT_RCV_ERR | XB_STAT_XMT_RTRY_ERR | XB_STAT_LINKALIVE)) {
-#ifdef	LATER
-	    printk(KERN_WARNING  "link %d[%s]: bad status 0x%x\n",
-		    link, xwidget_name, lnk_sts.linkstatus);
-#endif
-	}
-    }
-#ifdef LATER
-    if (xbow_soft->link_monitor)
-	(void) timeout(xbow_update_llp_status,
-		       (void *) (__psunsigned_t) vhdl, XBOW_STATS_TIMEOUT);
-#endif
-}
-
-int
-xbow_disable_llp_monitor(devfs_handle_t vhdl)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-    int                     port;
-
-    for (port = 0; port < MAX_XBOW_PORTS; port++) {
-	xbow_soft->xbow_link_status[port].rx_err_count = 0;
-	xbow_soft->xbow_link_status[port].tx_retry_count = 0;
-    }
-
-    xbow_soft->link_monitor = 0;
-    return 0;
-}
-
-int
-xbow_enable_llp_monitor(devfs_handle_t vhdl)
-{
-    xbow_soft_t             xbow_soft = xbow_soft_get(vhdl);
-
-#ifdef LATER
-    (void) timeout(xbow_update_llp_status,
-		   (void *) (__psunsigned_t) vhdl, XBOW_STATS_TIMEOUT);
-#endif
-    xbow_soft->link_monitor = 1;
-    return 0;
-}
-
-
-int
-xbow_reset_link(devfs_handle_t xconn_vhdl)
-{
-    xwidget_info_t          widget_info;
-    xwidgetnum_t            port;
-    xbow_t                 *xbow;
-    xbowreg_t               ctrl;
-    xbwX_stat_t             stat;
-    unsigned                itick;
-    unsigned                dtick;
-    static int              ticks_per_ms = 0;
-
-    if (!ticks_per_ms) {
-	itick = get_timestamp();
-	us_delay(1000);
-	ticks_per_ms = get_timestamp() - itick;
-    }
-    widget_info = xwidget_info_get(xconn_vhdl);
-    port = xwidget_info_id_get(widget_info);
-
-#ifdef XBOW_K1PTR			/* defined if we only have one xbow ... */
-    xbow = XBOW_K1PTR;
-#else
-    {
-	devfs_handle_t            xbow_vhdl;
-	xbow_soft_t             xbow_soft;
-
-	hwgraph_traverse(xconn_vhdl, ".master/xtalk/0/xbow", &xbow_vhdl);
-	xbow_soft = xbow_soft_get(xbow_vhdl);
-	xbow = xbow_soft->base;
-    }
-#endif
-
-    /*
-     * This requires three PIOs (reset the link, check for the
-     * reset, restore the control register for the link) plus
-     * 10us to wait for the reset. We allow up to 1ms for the
-     * widget to come out of reset before giving up and
-     * returning a failure.
-     */
-    ctrl = xbow->xb_link(port).link_control;
-    xbow->xb_link(port).link_reset = 0;
-    itick = get_timestamp();
-    while (1) {
-	stat.linkstatus = xbow->xb_link(port).link_status;
-	if (stat.link_alive)
-	    break;
-	dtick = get_timestamp() - itick;
-	if (dtick > ticks_per_ms) {
-	    return -1;			/* never came out of reset */
-	}
-	DELAY(2);			/* don't beat on link_status */
-    }
-    xbow->xb_link(port).link_control = ctrl;
-    return 0;
-}
-
-/*
- * Dump xbow registers.
- * input parameter is either a pointer to
- * the xbow chip or the vertex handle for
- * an xbow vertex.
- */
-void
-idbg_xbowregs(int64_t regs)
-{
-    xbow_t                 *xbow;
-    int                     i;
-    xb_linkregs_t          *link;
-
-#ifdef LATER
-    if (dev_is_vertex((devfs_handle_t) regs)) {
-	devfs_handle_t            vhdl = (devfs_handle_t) regs;
-	xbow_soft_t             soft = xbow_soft_get(vhdl);
-
-	xbow = soft->base;
-    } else
-#endif
-    {
-	xbow = (xbow_t *) regs;
-    }
-
-#ifdef LATER
-    qprintf("Printing xbow registers starting at 0x%x\n", xbow);
-    qprintf("wid %x status %x erruppr %x errlower %x control %x timeout %x\n",
-	    xbow->xb_wid_id, xbow->xb_wid_stat, xbow->xb_wid_err_upper,
-	    xbow->xb_wid_err_lower, xbow->xb_wid_control,
-	    xbow->xb_wid_req_timeout);
-    qprintf("intr uppr %x lower %x errcmd %x llp ctrl %x arb_reload %x\n",
-	    xbow->xb_wid_int_upper, xbow->xb_wid_int_lower,
-	    xbow->xb_wid_err_cmdword, xbow->xb_wid_llp,
-	    xbow->xb_wid_arb_reload);
-#endif
-
-    for (i = 8; i <= 0xf; i++) {
-	link = &xbow->xb_link(i);
-#ifdef LATER
-	qprintf("Link %d registers\n", i);
-	qprintf("\tctrl %x stat %x arbuppr %x arblowr %x auxstat %x\n",
-		link->link_control, link->link_status,
-		link->link_arb_upper, link->link_arb_lower,
-		link->link_aux_status);
-#endif
-    }
-}
-
-
-#define XBOW_ARB_RELOAD_TICKS		25
-					/* granularity: 4 MB/s, max: 124 MB/s */
-#define GRANULARITY			((100 * 1000000) / XBOW_ARB_RELOAD_TICKS)
-
-#define XBOW_BYTES_TO_GBR(BYTES_per_s)	(int) (BYTES_per_s / GRANULARITY)
-
-#define XBOW_GBR_TO_BYTES(cnt)		(bandwidth_t) ((cnt) * GRANULARITY)
-
-#define CEILING_BYTES_TO_GBR(gbr, bytes_per_sec)	\
-			((XBOW_GBR_TO_BYTES(gbr) < bytes_per_sec) ? gbr+1 : gbr)
-
-#define XBOW_ARB_GBR_MAX		31
-
-#define ABS(x)				((x > 0) ? (x) : (-1 * x))
-					/* absolute value */
-
-int
-xbow_bytes_to_gbr(bandwidth_t old_bytes_per_sec, bandwidth_t bytes_per_sec)
-{
-    int                     gbr_granted;
-    int                     new_total_gbr;
-    int                     change_gbr;
-    bandwidth_t             new_total_bw;
-
-#ifdef GRIO_DEBUG
-    printf("xbow_bytes_to_gbr: old_bytes_per_sec %lld bytes_per_sec %lld\n",
-		old_bytes_per_sec, bytes_per_sec);
-#endif	/* GRIO_DEBUG */
-
-    gbr_granted = CEILING_BYTES_TO_GBR((XBOW_BYTES_TO_GBR(old_bytes_per_sec)),
-			old_bytes_per_sec);
-    new_total_bw = old_bytes_per_sec + bytes_per_sec;
-    new_total_gbr = CEILING_BYTES_TO_GBR((XBOW_BYTES_TO_GBR(new_total_bw)),
-			new_total_bw);
-
-    change_gbr = new_total_gbr - gbr_granted;
-
-#ifdef GRIO_DEBUG
-    printf("xbow_bytes_to_gbr: gbr_granted %d new_total_gbr %d change_gbr %d\n",
-		gbr_granted, new_total_gbr, change_gbr);
-#endif	/* GRIO_DEBUG */
-
-    return (change_gbr);
-}
-
-/* Conversion from GBR to bytes */
-bandwidth_t
-xbow_gbr_to_bytes(int gbr)
-{
-    return (XBOW_GBR_TO_BYTES(gbr));
-}
-
-/* Given the vhdl for the desired xbow, the src and dest. widget ids
- * and the req_bw value, this xbow driver entry point accesses the
- * xbow registers and allocates the desired bandwidth if available.
- *
- * If bandwidth allocation is successful, return success else return failure.
- */
-int
-xbow_prio_bw_alloc(devfs_handle_t vhdl,
-		xwidgetnum_t src_wid,
-		xwidgetnum_t dest_wid,
-		unsigned long long old_alloc_bw,
-		unsigned long long req_bw)
-{
-    xbow_soft_t             soft = xbow_soft_get(vhdl);
-    volatile xbowreg_t     *xreg;
-    xbowreg_t               mask;
-    unsigned long           s;
-    int                     error = 0;
-    bandwidth_t             old_bw_BYTES, req_bw_BYTES;
-    xbowreg_t               old_xreg;
-    int                     old_bw_GBR, req_bw_GBR, new_bw_GBR;
-
-#ifdef GRIO_DEBUG
-    printf("xbow_prio_bw_alloc: vhdl %d src_wid %d dest_wid %d req_bw %lld\n",
-		(int) vhdl, (int) src_wid, (int) dest_wid, req_bw);
-#endif
-
-    ASSERT(XBOW_WIDGET_IS_VALID(src_wid));
-    ASSERT(XBOW_WIDGET_IS_VALID(dest_wid));
-
-    s = mutex_spinlock(&soft->xbow_bw_alloc_lock);
-
-    /* Get pointer to the correct register */
-    xreg = XBOW_PRIO_ARBREG_PTR(soft->base, dest_wid, src_wid);
-
-    /* Get mask for GBR count value */
-    mask = XB_ARB_GBR_MSK << XB_ARB_GBR_SHFT(src_wid);
-
-    req_bw_GBR = xbow_bytes_to_gbr(old_alloc_bw, req_bw);
-    req_bw_BYTES = (req_bw_GBR < 0) ? (-1 * xbow_gbr_to_bytes(ABS(req_bw_GBR)))
-		: xbow_gbr_to_bytes(req_bw_GBR);
-
-#ifdef GRIO_DEBUG
-    printf("req_bw %lld req_bw_BYTES %lld req_bw_GBR %d\n",
-		req_bw, req_bw_BYTES, req_bw_GBR);
-#endif	/* GRIO_DEBUG */
-
-    old_bw_BYTES = soft->bw_cur_used[(int) dest_wid - MAX_XBOW_PORTS];
-    old_xreg = *xreg;
-    old_bw_GBR = (((*xreg) & mask) >> XB_ARB_GBR_SHFT(src_wid));
-
-#ifdef GRIO_DEBUG
-    ASSERT(XBOW_BYTES_TO_GBR(old_bw_BYTES) == old_bw_GBR);
-
-    printf("old_bw_BYTES %lld old_bw_GBR %d\n", old_bw_BYTES, old_bw_GBR);
-
-    printf("req_bw_BYTES %lld old_bw_BYTES %lld soft->bw_hiwm %lld\n",
-		req_bw_BYTES, old_bw_BYTES,
-		soft->bw_hiwm[(int) dest_wid - MAX_XBOW_PORTS]);
-	   
-#endif				/* GRIO_DEBUG */
-
-    /* Accept the request only if we don't exceed the destination
-     * port HIWATER_MARK *AND* the max. link GBR arbitration count
-     */
-    if (((old_bw_BYTES + req_bw_BYTES) <=
-		soft->bw_hiwm[(int) dest_wid - MAX_XBOW_PORTS]) &&
-		(req_bw_GBR + old_bw_GBR <= XBOW_ARB_GBR_MAX)) {
-
-	new_bw_GBR = (old_bw_GBR + req_bw_GBR);
-
-	/* Set this in the xbow link register */
-	*xreg = (old_xreg & ~mask) | \
-	    (new_bw_GBR << XB_ARB_GBR_SHFT(src_wid) & mask);
-
-	soft->bw_cur_used[(int) dest_wid - MAX_XBOW_PORTS] =
-			xbow_gbr_to_bytes(new_bw_GBR);
-    } else {
-	error = 1;
-    }
-
-    mutex_spinunlock(&soft->xbow_bw_alloc_lock, s);
-
-    return (error);
-}

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)