patch-2.4.22 linux-2.4.22/arch/ia64/sn/io/hwgdfs/hcl.c

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diff -urN linux-2.4.21/arch/ia64/sn/io/hwgdfs/hcl.c linux-2.4.22/arch/ia64/sn/io/hwgdfs/hcl.c
@@ -0,0 +1,916 @@
+/*
+ * 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.
+ *
+ *  hcl - SGI's Hardware Graph compatibility layer.
+ *
+ * Copyright (C) 1992-1997,2000-2003 Silicon Graphics, Inc. All rights reserved.
+ */
+
+#include <linux/types.h>
+#include <linux/config.h>
+#include <linux/slab.h>
+#include <linux/ctype.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <asm/sn/sgi.h>
+#include <linux/devfs_fs.h>
+#include <linux/devfs_fs_kernel.h>
+#include <asm/io.h>
+#include <asm/sn/iograph.h>
+#include <asm/sn/invent.h>
+#include <asm/sn/hcl.h>
+#include <asm/sn/labelcl.h>
+#include <asm/sn/simulator.h>
+
+#define HCL_NAME "SGI-HWGRAPH COMPATIBILITY DRIVER"
+#define HCL_TEMP_NAME "HCL_TEMP_NAME_USED_FOR_HWGRAPH_VERTEX_CREATE"
+#define HCL_TEMP_NAME_LEN 44 
+#define HCL_VERSION "1.0"
+vertex_hdl_t hwgraph_root;
+vertex_hdl_t linux_busnum;
+
+extern void pci_bus_cvlink_init(void);
+
+/*
+ * Debug flag definition.
+ */
+#define OPTION_NONE             0x00
+#define HCL_DEBUG_NONE 0x00000
+#define HCL_DEBUG_ALL  0x0ffff
+#if defined(CONFIG_HCL_DEBUG)
+static unsigned int hcl_debug_init __initdata = HCL_DEBUG_NONE;
+#endif
+static unsigned int hcl_debug = HCL_DEBUG_NONE;
+#if defined(CONFIG_HCL_DEBUG) && !defined(MODULE)
+static unsigned int boot_options = OPTION_NONE;
+#endif
+
+/*
+ * Some Global definitions.
+ */
+static vertex_hdl_t hcl_handle;
+
+invplace_t invplace_none = {
+	GRAPH_VERTEX_NONE,
+	GRAPH_VERTEX_PLACE_NONE,
+	NULL
+};
+
+/*
+ * HCL device driver.
+ * The purpose of this device driver is to provide a facility 
+ * for User Level Apps e.g. hinv, ioconfig etc. an ioctl path 
+ * to manipulate label entries without having to implement
+ * system call interfaces.  This methodology will enable us to 
+ * make this feature module loadable.
+ */
+static int hcl_open(struct inode * inode, struct file * filp)
+{
+	if (hcl_debug) {
+        	printk("HCL: hcl_open called.\n");
+	}
+
+        return(0);
+
+}
+
+static int hcl_close(struct inode * inode, struct file * filp)
+{
+
+	if (hcl_debug) {
+        	printk("HCL: hcl_close called.\n");
+	}
+
+        return(0);
+
+}
+
+static int hcl_ioctl(struct inode * inode, struct file * file,
+        unsigned int cmd, unsigned long arg)
+{
+
+	if (hcl_debug) {
+		printk("HCL: hcl_ioctl called.\n");
+	}
+
+	switch (cmd) {
+		default:
+			if (hcl_debug) {
+				printk("HCL: hcl_ioctl cmd = 0x%x\n", cmd);
+			}
+	}
+
+	return(0);
+
+}
+
+struct file_operations hcl_fops = {
+	(struct module *)0,
+	NULL,		/* lseek - default */
+	NULL,		/* read - general block-dev read */
+	NULL,		/* write - general block-dev write */
+	NULL,		/* readdir - bad */
+	NULL,		/* poll */
+	hcl_ioctl,      /* ioctl */
+	NULL,		/* mmap */
+	hcl_open,	/* open */
+	NULL,		/* flush */
+	hcl_close,	/* release */
+	NULL,		/* fsync */
+	NULL,		/* fasync */
+	NULL,		/* lock */
+	NULL,		/* readv */
+	NULL,		/* writev */
+};
+
+
+/*
+ * init_hcl() - Boot time initialization.  Ensure that it is called 
+ *	after devfs has been initialized.
+ *
+ * For now this routine is being called out of devfs/base.c.  Actually 
+ * Not a bad place to be ..
+ *
+ */
+int __init init_hcl(void)
+{
+	extern void string_table_init(struct string_table *);
+	extern struct string_table label_string_table;
+	extern int init_ifconfig_net(void);
+	extern int init_ioconfig_bus(void);
+	int status = 0;
+	int rv = 0;
+
+	if (IS_RUNNING_ON_SIMULATOR()) {
+		extern u64 klgraph_addr[];
+		klgraph_addr[0] = 0xe000003000030000;
+	}
+
+	/*
+	 * Create the hwgraph_root on devfs.
+	 */
+	rv = hwgraph_path_add(NULL, EDGE_LBL_HW, &hwgraph_root);
+	if (rv)
+		printk ("WARNING: init_hcl: Failed to create hwgraph_root. Error = %d.\n", rv);
+
+	status = devfs_set_flags (hwgraph_root, DEVFS_FL_HIDE);
+
+	/*
+	 * Create the hcl driver to support inventory entry manipulations.
+	 * By default, it is expected that devfs is mounted on /dev.
+	 *
+	 */
+	hcl_handle = hwgraph_register(hwgraph_root, ".hcl",
+			0, DEVFS_FL_AUTO_DEVNUM,
+			0, 0,
+			S_IFCHR | S_IRUSR | S_IWUSR | S_IRGRP, 0, 0,
+			&hcl_fops, NULL);
+
+	if (hcl_handle == NULL) {
+		panic("HCL: Unable to create HCL Driver in init_hcl().\n");
+		return(0);
+	}
+
+	/*
+	 * Initialize the HCL string table.
+	 */
+	string_table_init(&label_string_table);
+
+	/*
+	 * Create the directory that links Linux bus numbers to our Xwidget.
+	 */
+	rv = hwgraph_path_add(hwgraph_root, EDGE_LBL_LINUX_BUS, &linux_busnum);
+	if (linux_busnum == NULL) {
+		panic("HCL: Unable to create %s\n", EDGE_LBL_LINUX_BUS);
+		return(0);
+	}
+
+	pci_bus_cvlink_init();
+
+	/*
+	 * Initialize the ifconfgi_net driver that does network devices 
+	 * Persistent Naming.
+	 */
+	init_ifconfig_net();
+	init_ioconfig_bus();
+
+	return(0);
+
+}
+
+
+/*
+ * hcl_setup() - Process boot time parameters if given.
+ *	"hcl="
+ *	This routine gets called only if "hcl=" is given in the 
+ *	boot line and before init_hcl().
+ *
+ *	We currently do not have any boot options .. when we do, 
+ *	functionalities can be added here.
+ *
+ */
+static int __init hcl_setup(char *str)
+{
+    while ( (*str != '\0') && !isspace (*str) )
+    {
+#ifdef CONFIG_HCL_DEBUG
+        if (strncmp (str, "all", 3) == 0) {
+            hcl_debug_init |= HCL_DEBUG_ALL;
+            str += 3;
+        } else 
+        	return 0;
+#endif
+        if (*str != ',') return 0;
+        ++str;
+    }
+
+    return 1;
+
+}
+
+__setup("hcl=", hcl_setup);
+
+
+/*
+ * Set device specific "fast information".
+ *
+ */
+void
+hwgraph_fastinfo_set(vertex_hdl_t de, arbitrary_info_t fastinfo)
+{
+	labelcl_info_replace_IDX(de, HWGRAPH_FASTINFO, fastinfo, NULL);
+}
+
+
+/*
+ * Get device specific "fast information".
+ *
+ */
+arbitrary_info_t
+hwgraph_fastinfo_get(vertex_hdl_t de)
+{
+	arbitrary_info_t fastinfo;
+	int rv;
+
+	if (!de) {
+		printk(KERN_WARNING "HCL: hwgraph_fastinfo_get handle given is NULL.\n");
+		return(-1);
+	}
+
+	rv = labelcl_info_get_IDX(de, HWGRAPH_FASTINFO, &fastinfo);
+	if (rv == 0)
+		return(fastinfo);
+
+	return(0);
+}
+
+
+/*
+ * hwgraph_connectpt_set - Sets the connect point handle in de to the 
+ *	given connect_de handle.  By default, the connect point of the 
+ *	devfs node is the parent.  This effectively changes this assumption.
+ */
+int
+hwgraph_connectpt_set(vertex_hdl_t de, vertex_hdl_t connect_de)
+{
+	int rv;
+
+	if (!de)
+		return(-1);
+
+	rv = labelcl_info_connectpt_set(de, connect_de);
+
+	return(rv);
+}
+
+
+/*
+ * hwgraph_connectpt_get: Returns the entry's connect point  in the devfs 
+ *	tree.
+ */
+vertex_hdl_t
+hwgraph_connectpt_get(vertex_hdl_t de)
+{
+	int rv;
+	arbitrary_info_t info;
+	vertex_hdl_t connect;
+
+	rv = labelcl_info_get_IDX(de, HWGRAPH_CONNECTPT, &info);
+	if (rv != 0) {
+		return(NULL);
+	}
+
+	connect = (vertex_hdl_t)info;
+	return(connect);
+
+}
+
+
+/*
+ * hwgraph_mk_dir - Creates a directory entry with devfs.
+ *	Note that a directory entry in devfs can have children 
+ *	but it cannot be a char|block special file.
+ */
+vertex_hdl_t
+hwgraph_mk_dir(vertex_hdl_t de, const char *name,
+                unsigned int namelen, void *info)
+{
+
+	int rv;
+	labelcl_info_t *labelcl_info = NULL;
+	vertex_hdl_t new_devfs_handle = NULL;
+	vertex_hdl_t parent = NULL;
+
+	/*
+	 * Create the device info structure for hwgraph compatiblity support.
+	 */
+	labelcl_info = labelcl_info_create();
+	if (!labelcl_info)
+		return(NULL);
+
+	/*
+	 * Create a devfs entry.
+	 */
+	new_devfs_handle = devfs_mk_dir(de, name, (void *)labelcl_info);
+	if (!new_devfs_handle) {
+		labelcl_info_destroy(labelcl_info);
+		return(NULL);
+	}
+
+	/*
+	 * Get the parent handle.
+	 */
+	parent = devfs_get_parent (new_devfs_handle);
+
+	/*
+	 * To provide the same semantics as the hwgraph, set the connect point.
+	 */
+	rv = hwgraph_connectpt_set(new_devfs_handle, parent);
+	if (!rv) {
+		/*
+		 * We need to clean up!
+		 */
+	}
+
+	/*
+	 * If the caller provides a private data pointer, save it in the 
+	 * labelcl info structure(fastinfo).  This can be retrieved via
+	 * hwgraph_fastinfo_get()
+	 */
+	if (info)
+		hwgraph_fastinfo_set(new_devfs_handle, (arbitrary_info_t)info);
+		
+	return(new_devfs_handle);
+
+}
+
+/*
+ * hwgraph_path_add - Create a directory node with the given path starting 
+ * from the given vertex_hdl_t.
+ */
+int
+hwgraph_path_add(vertex_hdl_t  fromv,
+		 char *path,
+		 vertex_hdl_t *new_de)
+{
+
+	unsigned int	namelen = strlen(path);
+	int		rv;
+
+	/*
+	 * We need to handle the case when fromv is NULL ..
+	 * in this case we need to create the path from the 
+	 * hwgraph root!
+	 */
+	if (fromv == NULL)
+		fromv = hwgraph_root;
+
+	/*
+	 * check the entry doesn't already exist, if it does
+	 * then we simply want new_de to point to it (otherwise
+	 * we'll overwrite the existing labelcl_info struct)
+	 */
+	rv = hwgraph_edge_get(fromv, path, new_de);
+	if (rv)	{	/* couldn't find entry so we create it */
+		*new_de = hwgraph_mk_dir(fromv, path, namelen, NULL);
+		if (new_de == NULL)
+			return(-1);
+		else
+			return(0);
+	}
+	else 
+ 		return(0);
+
+}
+
+/*
+ * hwgraph_register  - Creates a file entry with devfs.
+ *	Note that a file entry cannot have children .. it is like a 
+ *	char|block special vertex in hwgraph.
+ */
+vertex_hdl_t
+hwgraph_register(vertex_hdl_t de, const char *name,
+                unsigned int namelen, unsigned int flags, 
+		unsigned int major, unsigned int minor,
+                umode_t mode, uid_t uid, gid_t gid, 
+		struct file_operations *fops,
+                void *info)
+{
+
+        vertex_hdl_t new_devfs_handle = NULL;
+
+        /*
+         * Create a devfs entry.
+         */
+        new_devfs_handle = devfs_register(de, name, flags, major,
+				minor, mode, fops, info);
+        if (!new_devfs_handle) {
+                return(NULL);
+        }
+
+        return(new_devfs_handle);
+
+}
+
+
+/*
+ * hwgraph_mk_symlink - Create a symbolic link.
+ */
+int
+hwgraph_mk_symlink(vertex_hdl_t de, const char *name, unsigned int namelen,
+                unsigned int flags, const char *link, unsigned int linklen, 
+		vertex_hdl_t *handle, void *info)
+{
+
+	void *labelcl_info = NULL;
+	int status = 0;
+	vertex_hdl_t new_devfs_handle = NULL;
+
+	/*
+	 * Create the labelcl info structure for hwgraph compatiblity support.
+	 */
+	labelcl_info = labelcl_info_create();
+	if (!labelcl_info)
+		return(-1);
+
+	/*
+	 * Create a symbolic link devfs entry.
+	 */
+	status = devfs_mk_symlink(de, name, flags, link,
+				&new_devfs_handle, labelcl_info);
+	if ( (!new_devfs_handle) || (!status) ){
+		labelcl_info_destroy((labelcl_info_t *)labelcl_info);
+		return(-1);
+	}
+
+	/*
+	 * If the caller provides a private data pointer, save it in the 
+	 * labelcl info structure(fastinfo).  This can be retrieved via
+	 * hwgraph_fastinfo_get()
+	 */
+	if (info)
+		hwgraph_fastinfo_set(new_devfs_handle, (arbitrary_info_t)info);
+
+	*handle = new_devfs_handle;
+	return(0);
+
+}
+
+/*
+ * hwgraph_vertex_destroy - Destroy the devfs entry
+ */
+int
+hwgraph_vertex_destroy(vertex_hdl_t de)
+{
+
+	void *labelcl_info = NULL;
+
+	labelcl_info = devfs_get_info(de);
+	devfs_unregister(de);
+
+	if (labelcl_info)
+		labelcl_info_destroy((labelcl_info_t *)labelcl_info);
+
+	return(0);
+}
+
+/*
+ * hwgraph_edge_add - This routines has changed from the original conext.
+ * All it does now is to create a symbolic link from "from" to "to".
+ */
+/* ARGSUSED */
+int
+hwgraph_edge_add(vertex_hdl_t from, vertex_hdl_t to, char *name)
+{
+
+	char *path;
+	char *s1;
+	char *index;
+	int name_start;
+	vertex_hdl_t handle = NULL;
+	int rv;
+	int i, count;
+
+	path = kmalloc(1024, GFP_KERNEL);
+	memset(path, 0x0, 1024);
+	name_start = devfs_generate_path (from, path, 1024);
+	s1 = &path[name_start];
+	count = 0;
+	while (1) {
+		index = strstr (s1, "/");
+		if (index) {
+			count++;
+			s1 = ++index;
+		} else {
+			count++;
+			break;
+		}
+	}
+
+	memset(path, 0x0, 1024);
+	name_start = devfs_generate_path (to, path, 1024);
+
+	for (i = 0; i < count; i++) {
+		strcat(path,"../");
+	}
+
+	strcat(path, &path[name_start]);
+
+	/*
+	 * Otherwise, just create a symlink to the vertex.
+	 * In this case the vertex was previous created with a REAL pathname.
+	 */
+	rv = devfs_mk_symlink (from, (const char *)name, 
+			       DEVFS_FL_DEFAULT, path,
+			       &handle, NULL);
+
+	name_start = devfs_generate_path (handle, path, 1024);
+	return(rv);
+
+	
+}
+/* ARGSUSED */
+int
+hwgraph_edge_get(vertex_hdl_t from, char *name, vertex_hdl_t *toptr)
+{
+
+	int namelen = 0;
+	vertex_hdl_t target_handle = NULL;
+
+	if (name == NULL)
+		return(-1);
+
+	if (toptr == NULL)
+		return(-1);
+
+	/*
+	 * If the name is "." just return the current devfs entry handle.
+	 */
+	if (!strcmp(name, HWGRAPH_EDGELBL_DOT)) {
+		if (toptr) {
+			*toptr = from;
+		}
+	} else if (!strcmp(name, HWGRAPH_EDGELBL_DOTDOT)) {
+		/*
+		 * Hmmm .. should we return the connect point or parent ..
+		 * see in hwgraph, the concept of parent is the connectpt!
+		 *
+		 * Maybe we should see whether the connectpt is set .. if 
+		 * not just return the parent!
+		 */
+		target_handle = hwgraph_connectpt_get(from);
+		if (target_handle) {
+			/*
+			 * Just return the connect point.
+			 */
+			*toptr = target_handle;
+			return(0);
+		}
+		target_handle = devfs_get_parent(from);
+		*toptr = target_handle;
+
+	} else {
+		/*
+		 * Call devfs to get the devfs entry.
+		 */
+		namelen = (int) strlen(name);
+		target_handle = devfs_find_handle (from, name, 0, 0,
+					0, 1); /* Yes traverse symbolic links */
+		if (target_handle == NULL)
+			return(-1);
+		else
+		*toptr = target_handle;
+	}
+
+	return(0);
+}
+
+/*
+ * hwgraph_info_add_LBL - Adds a new label for the device.  Mark the info_desc
+ *	of the label as INFO_DESC_PRIVATE and store the info in the label.
+ */
+/* ARGSUSED */
+int
+hwgraph_info_add_LBL(	vertex_hdl_t de,
+			char *name,
+			arbitrary_info_t info)
+{
+	return(labelcl_info_add_LBL(de, name, INFO_DESC_PRIVATE, info));
+}
+
+/*
+ * hwgraph_info_remove_LBL - Remove the label entry for the device.
+ */
+/* ARGSUSED */
+int
+hwgraph_info_remove_LBL(	vertex_hdl_t de,
+				char *name,
+				arbitrary_info_t *old_info)
+{
+	return(labelcl_info_remove_LBL(de, name, NULL, old_info));
+}
+
+/*
+ * hwgraph_info_replace_LBL - replaces an existing label with 
+ *	a new label info value.
+ */
+/* ARGSUSED */
+int
+hwgraph_info_replace_LBL(	vertex_hdl_t de,
+				char *name,
+				arbitrary_info_t info,
+				arbitrary_info_t *old_info)
+{
+	return(labelcl_info_replace_LBL(de, name,
+			INFO_DESC_PRIVATE, info,
+			NULL, old_info));
+}
+/*
+ * hwgraph_info_get_LBL - Get and return the info value in the label of the 
+ * 	device.
+ */
+/* ARGSUSED */
+int
+hwgraph_info_get_LBL(	vertex_hdl_t de,
+			char *name,
+			arbitrary_info_t *infop)
+{
+	return(labelcl_info_get_LBL(de, name, NULL, infop));
+}
+
+/*
+ * hwgraph_info_get_exported_LBL - Retrieve the info_desc and info pointer 
+ *	of the given label for the device.  The weird thing is that the label 
+ *	that matches the name is return irrespective of the info_desc value!
+ *	Do not understand why the word "exported" is used!
+ */
+/* ARGSUSED */
+int
+hwgraph_info_get_exported_LBL(	vertex_hdl_t de,
+				char *name,
+				int *export_info,
+				arbitrary_info_t *infop)
+{
+	int rc;
+	arb_info_desc_t info_desc;
+
+	rc = labelcl_info_get_LBL(de, name, &info_desc, infop);
+	if (rc == 0)
+		*export_info = (int)info_desc;
+
+	return(rc);
+}
+
+/*
+ * hwgraph_info_get_next_LBL - Returns the next label info given the 
+ *	current label entry in place.
+ *
+ *	Once again this has no locking or reference count for protection.
+ *
+ */
+/* ARGSUSED */
+int
+hwgraph_info_get_next_LBL(	vertex_hdl_t de,
+				char *buf,
+				arbitrary_info_t *infop,
+				labelcl_info_place_t *place)
+{
+	return(labelcl_info_get_next_LBL(de, buf, NULL, infop, place));
+}
+
+/*
+ * hwgraph_info_export_LBL - Retrieve the specified label entry and modify 
+ *	the info_desc field with the given value in nbytes.
+ */
+/* ARGSUSED */
+int
+hwgraph_info_export_LBL(vertex_hdl_t de, char *name, int nbytes)
+{
+	arbitrary_info_t info;
+	int rc;
+
+	if (nbytes == 0)
+		nbytes = INFO_DESC_EXPORT;
+
+	if (nbytes < 0)
+		return(-1);
+
+	rc = labelcl_info_get_LBL(de, name, NULL, &info);
+	if (rc != 0)
+		return(rc);
+
+	rc = labelcl_info_replace_LBL(de, name,
+				nbytes, info, NULL, NULL);
+
+	return(rc);
+}
+
+/*
+ * hwgraph_info_unexport_LBL - Retrieve the given label entry and change the 
+ * label info_descr filed to INFO_DESC_PRIVATE.
+ */
+/* ARGSUSED */
+int
+hwgraph_info_unexport_LBL(vertex_hdl_t de, char *name)
+{
+	arbitrary_info_t info;
+	int rc;
+
+	rc = labelcl_info_get_LBL(de, name, NULL, &info);
+	if (rc != 0)
+		return(rc);
+
+	rc = labelcl_info_replace_LBL(de, name,
+				INFO_DESC_PRIVATE, info, NULL, NULL);
+
+	return(rc);
+}
+
+/*
+ * hwgraph_path_lookup - return the handle for the given path.
+ *
+ */
+int
+hwgraph_path_lookup(	vertex_hdl_t start_vertex_handle,
+			char *lookup_path,
+			vertex_hdl_t *vertex_handle_ptr,
+			char **remainder)
+{
+	*vertex_handle_ptr = devfs_find_handle(start_vertex_handle,	/* start dir */
+					lookup_path,		/* path */
+					0,			/* major */
+					0,			/* minor */
+					0,			/* char | block */
+					1);			/* traverse symlinks */
+	if (*vertex_handle_ptr == NULL)
+		return(-1);
+	else
+		return(0);
+}
+
+/*
+ * hwgraph_traverse - Find and return the devfs handle starting from de.
+ *
+ */
+graph_error_t
+hwgraph_traverse(vertex_hdl_t de, char *path, vertex_hdl_t *found)
+{
+	/* 
+	 * get the directory entry (path should end in a directory)
+	 */
+
+	*found = devfs_find_handle(de,	/* start dir */
+			    path,	/* path */
+			    0,		/* major */
+			    0,		/* minor */
+			    0,		/* char | block */
+			    1);		/* traverse symlinks */
+	if (*found == NULL)
+		return(GRAPH_NOT_FOUND);
+	else
+		return(GRAPH_SUCCESS);
+}
+
+/*
+ * hwgraph_path_to_vertex - Return the devfs entry handle for the given 
+ *	pathname .. assume traverse symlinks too!.
+ */
+vertex_hdl_t
+hwgraph_path_to_vertex(char *path)
+{
+	return(devfs_find_handle(NULL,	/* start dir */
+			path,		/* path */
+		    	0,		/* major */
+		    	0,		/* minor */
+		    	0,		/* char | block */
+		    	1));		/* traverse symlinks */
+}
+
+/*
+ * hwgraph_inventory_remove - Removes an inventory entry.
+ *
+ *	Remove an inventory item associated with a vertex.   It is the caller's
+ *	responsibility to make sure that there are no races between removing
+ *	inventory from a vertex and simultaneously removing that vertex.
+*/
+int
+hwgraph_inventory_remove(	vertex_hdl_t de,
+				int class,
+				int type,
+				major_t controller,
+				minor_t unit,
+				int state)
+{
+	return(0); /* Just a Stub for IRIX code. */
+}
+
+/*
+ * Find the canonical name for a given vertex by walking back through
+ * connectpt's until we hit the hwgraph root vertex (or until we run
+ * out of buffer space or until something goes wrong).
+ *
+ *	COMPATIBILITY FUNCTIONALITY
+ * Walks back through 'parents', not necessarily the same as connectpts.
+ *
+ * Need to resolve the fact that devfs does not return the path from 
+ * "/" but rather it just stops right before /dev ..
+ */
+int
+hwgraph_vertex_name_get(vertex_hdl_t vhdl, char *buf, uint buflen)
+{
+	char *locbuf;
+	int   pos;
+
+	if (buflen < 1)
+		return(-1);	/* XXX should be GRAPH_BAD_PARAM ? */
+
+	locbuf = kmalloc(buflen, GFP_KERNEL);
+
+	pos = devfs_generate_path(vhdl, locbuf, buflen);
+	if (pos < 0) {
+		kfree(locbuf);
+		return pos;
+	}
+
+	strcpy(buf, &locbuf[pos]);
+	kfree(locbuf);
+	return 0;
+}
+
+/*
+** vertex_to_name converts a vertex into a canonical name by walking
+** back through connect points until we hit the hwgraph root (or until
+** we run out of buffer space).
+**
+** Usually returns a pointer to the original buffer, filled in as
+** appropriate.  If the buffer is too small to hold the entire name,
+** or if anything goes wrong while determining the name, vertex_to_name
+** returns "UnknownDevice".
+*/
+
+#define DEVNAME_UNKNOWN "UnknownDevice"
+
+char *
+vertex_to_name(vertex_hdl_t vhdl, char *buf, uint buflen)
+{
+	if (hwgraph_vertex_name_get(vhdl, buf, buflen) == GRAPH_SUCCESS)
+		return(buf);
+	else
+		return(DEVNAME_UNKNOWN);
+}
+
+graph_error_t
+hwgraph_edge_remove(vertex_hdl_t from, char *name, vertex_hdl_t *toptr)
+{
+	printk("WARNING: hwgraph_edge_remove NOT supported.\n");
+	return(GRAPH_ILLEGAL_REQUEST);
+}
+
+graph_error_t
+hwgraph_vertex_unref(vertex_hdl_t vhdl)
+{
+	return(GRAPH_ILLEGAL_REQUEST);
+}
+
+
+EXPORT_SYMBOL(hwgraph_mk_dir);
+EXPORT_SYMBOL(hwgraph_path_add);
+EXPORT_SYMBOL(hwgraph_register);
+EXPORT_SYMBOL(hwgraph_vertex_destroy);
+EXPORT_SYMBOL(hwgraph_fastinfo_get);
+EXPORT_SYMBOL(hwgraph_fastinfo_set);
+EXPORT_SYMBOL(hwgraph_connectpt_set);
+EXPORT_SYMBOL(hwgraph_connectpt_get);
+EXPORT_SYMBOL(hwgraph_info_add_LBL);
+EXPORT_SYMBOL(hwgraph_info_remove_LBL);
+EXPORT_SYMBOL(hwgraph_info_replace_LBL);
+EXPORT_SYMBOL(hwgraph_info_get_LBL);
+EXPORT_SYMBOL(hwgraph_info_get_exported_LBL);
+EXPORT_SYMBOL(hwgraph_info_get_next_LBL);
+EXPORT_SYMBOL(hwgraph_info_export_LBL);
+EXPORT_SYMBOL(hwgraph_info_unexport_LBL);
+EXPORT_SYMBOL(hwgraph_path_lookup);
+EXPORT_SYMBOL(hwgraph_traverse);
+EXPORT_SYMBOL(hwgraph_vertex_name_get);
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)