arch/powerpc/platforms/pseries/reconfig.c - linux - Git at Google

 /*
  * pSeries_reconfig.c - support for dynamic reconfiguration (including PCI
  * Hotplug and Dynamic Logical Partitioning on RPA platforms).
  *
  * Copyright (C) 2005 Nathan Lynch
  * Copyright (C) 2005 IBM Corporation
  *
  *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License version
  *	2 as published by the Free Software Foundation.
  */

 #include <linux/kernel.h>
 #include <linux/notifier.h>
 #include <linux/proc_fs.h>
 #include <linux/slab.h>
 #include <linux/of.h>

 #include <asm/prom.h>
 #include <asm/machdep.h>
 #include <linux/uaccess.h>
 #include <asm/mmu.h>

 #include "of_helpers.h"

 static int pSeries_reconfig_add_node(const char *path, struct property *proplist)
 {
 	struct device_node *np;
 	int err = -ENOMEM;

 	np = kzalloc(sizeof(*np), GFP_KERNEL);
 	if (!np)
 		goto out_err;

 	np->full_name = kstrdup(path, GFP_KERNEL);
 	if (!np->full_name)
 		goto out_err;

 	np->properties = proplist;
 	of_node_set_flag(np, OF_DYNAMIC);
 	of_node_init(np);

 	np->parent = pseries_of_derive_parent(path);
 	if (IS_ERR(np->parent)) {
 		err = PTR_ERR(np->parent);
 		goto out_err;
 	}

 	err = of_attach_node(np);
 	if (err) {
 		printk(KERN_ERR "Failed to add device node %s\n", path);
 		goto out_err;
 	}

 	of_node_put(np->parent);

 	return 0;

 out_err:
 	if (np) {
 		of_node_put(np->parent);
 		kfree(np->full_name);
 		kfree(np);
 	}
 	return err;
 }

 static int pSeries_reconfig_remove_node(struct device_node *np)
 {
 	struct device_node *parent, *child;

 	parent = of_get_parent(np);
 	if (!parent)
 		return -EINVAL;

 	if ((child = of_get_next_child(np, NULL))) {
 		of_node_put(child);
 		of_node_put(parent);
 		return -EBUSY;
 	}

 	of_detach_node(np);
 	of_node_put(parent);
 	return 0;
 }

 /*
  * /proc/powerpc/ofdt - yucky binary interface for adding and removing
  * OF device nodes.  Should be deprecated as soon as we get an
  * in-kernel wrapper for the RTAS ibm,configure-connector call.
  */

 static void release_prop_list(const struct property *prop)
 {
 	struct property *next;
 	for (; prop; prop = next) {
 		next = prop->next;
 		kfree(prop->name);
 		kfree(prop->value);
 		kfree(prop);
 	}

 }

 /**
  * parse_next_property - process the next property from raw input buffer
  * @buf: input buffer, must be nul-terminated
  * @end: end of the input buffer + 1, for validation
  * @name: return value; set to property name in buf
  * @length: return value; set to length of value
  * @value: return value; set to the property value in buf
  *
  * Note that the caller must make copies of the name and value returned,
  * this function does no allocation or copying of the data.  Return value
  * is set to the next name in buf, or NULL on error.
  */
 static char * parse_next_property(char *buf, char *end, char **name, int *length,
 				  unsigned char **value)
 {
 	char *tmp;

 	*name = buf;

 	tmp = strchr(buf, ' ');
 	if (!tmp) {
 		printk(KERN_ERR "property parse failed in %s at line %d\n",
 		       __func__, __LINE__);
 		return NULL;
 	}
 	*tmp = '\0';

 	if (++tmp >= end) {
 		printk(KERN_ERR "property parse failed in %s at line %d\n",
 		       __func__, __LINE__);
 		return NULL;
 	}

 	/* now we're on the length */
 	*length = -1;
 	*length = simple_strtoul(tmp, &tmp, 10);
 	if (*length == -1) {
 		printk(KERN_ERR "property parse failed in %s at line %d\n",
 		       __func__, __LINE__);
 		return NULL;
 	}
 	if (*tmp != ' ' || ++tmp >= end) {
 		printk(KERN_ERR "property parse failed in %s at line %d\n",
 		       __func__, __LINE__);
 		return NULL;
 	}

 	/* now we're on the value */
 	*value = tmp;
 	tmp += *length;
 	if (tmp > end) {
 		printk(KERN_ERR "property parse failed in %s at line %d\n",
 		       __func__, __LINE__);
 		return NULL;
 	}
 	else if (tmp < end && *tmp != ' ' && *tmp != '\0') {
 		printk(KERN_ERR "property parse failed in %s at line %d\n",
 		       __func__, __LINE__);
 		return NULL;
 	}
 	tmp++;

 	/* and now we should be on the next name, or the end */
 	return tmp;
 }

 static struct property *new_property(const char *name, const int length,
 				     const unsigned char *value, struct property *last)
 {
 	struct property *new = kzalloc(sizeof(*new), GFP_KERNEL);

 	if (!new)
 		return NULL;

 	if (!(new->name = kstrdup(name, GFP_KERNEL)))
 		goto cleanup;
 	if (!(new->value = kmalloc(length + 1, GFP_KERNEL)))
 		goto cleanup;

 	memcpy(new->value, value, length);
 	*(((char *)new->value) + length) = 0;
 	new->length = length;
 	new->next = last;
 	return new;

 cleanup:
 	kfree(new->name);
 	kfree(new->value);
 	kfree(new);
 	return NULL;
 }

 static int do_add_node(char *buf, size_t bufsize)
 {
 	char *path, *end, *name;
 	struct device_node *np;
 	struct property *prop = NULL;
 	unsigned char* value;
 	int length, rv = 0;

 	end = buf + bufsize;
 	path = buf;
 	buf = strchr(buf, ' ');
 	if (!buf)
 		return -EINVAL;
 	*buf = '\0';
 	buf++;

 	if ((np = of_find_node_by_path(path))) {
 		of_node_put(np);
 		return -EINVAL;
 	}

 	/* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */
 	while (buf < end &&
 	       (buf = parse_next_property(buf, end, &name, &length, &value))) {
 		struct property *last = prop;

 		prop = new_property(name, length, value, last);
 		if (!prop) {
 			rv = -ENOMEM;
 			prop = last;
 			goto out;
 		}
 	}
 	if (!buf) {
 		rv = -EINVAL;
 		goto out;
 	}

 	rv = pSeries_reconfig_add_node(path, prop);

 out:
 	if (rv)
 		release_prop_list(prop);
 	return rv;
 }

 static int do_remove_node(char *buf)
 {
 	struct device_node *node;
 	int rv = -ENODEV;

 	if ((node = of_find_node_by_path(buf)))
 		rv = pSeries_reconfig_remove_node(node);

 	of_node_put(node);
 	return rv;
 }

 static char *parse_node(char *buf, size_t bufsize, struct device_node **npp)
 {
 	char *handle_str;
 	phandle handle;
 	*npp = NULL;

 	handle_str = buf;

 	buf = strchr(buf, ' ');
 	if (!buf)
 		return NULL;
 	*buf = '\0';
 	buf++;

 	handle = simple_strtoul(handle_str, NULL, 0);

 	*npp = of_find_node_by_phandle(handle);
 	return buf;
 }

 static int do_add_property(char *buf, size_t bufsize)
 {
 	struct property *prop = NULL;
 	struct device_node *np;
 	unsigned char *value;
 	char *name, *end;
 	int length;
 	end = buf + bufsize;
 	buf = parse_node(buf, bufsize, &np);

 	if (!np)
 		return -ENODEV;

 	if (parse_next_property(buf, end, &name, &length, &value) == NULL)
 		return -EINVAL;

 	prop = new_property(name, length, value, NULL);
 	if (!prop)
 		return -ENOMEM;

 	of_add_property(np, prop);

 	return 0;
 }

 static int do_remove_property(char *buf, size_t bufsize)
 {
 	struct device_node *np;
 	char *tmp;
 	buf = parse_node(buf, bufsize, &np);

 	if (!np)
 		return -ENODEV;

 	tmp = strchr(buf,' ');
 	if (tmp)
 		*tmp = '\0';

 	if (strlen(buf) == 0)
 		return -EINVAL;

 	return of_remove_property(np, of_find_property(np, buf, NULL));
 }

 static int do_update_property(char *buf, size_t bufsize)
 {
 	struct device_node *np;
 	unsigned char *value;
 	char *name, *end, *next_prop;
 	int length;
 	struct property *newprop;
 	buf = parse_node(buf, bufsize, &np);
 	end = buf + bufsize;

 	if (!np)
 		return -ENODEV;

 	next_prop = parse_next_property(buf, end, &name, &length, &value);
 	if (!next_prop)
 		return -EINVAL;

 	if (!strlen(name))
 		return -ENODEV;

 	newprop = new_property(name, length, value, NULL);
 	if (!newprop)
 		return -ENOMEM;

 	if (!strcmp(name, "slb-size") || !strcmp(name, "ibm,slb-size"))
 		slb_set_size(*(int *)value);

 	return of_update_property(np, newprop);
 }

 /**
  * ofdt_write - perform operations on the Open Firmware device tree
  *
  * @file: not used
  * @buf: command and arguments
  * @count: size of the command buffer
  * @off: not used
  *
  * Operations supported at this time are addition and removal of
  * whole nodes along with their properties.  Operations on individual
  * properties are not implemented (yet).
  */
 static ssize_t ofdt_write(struct file *file, const char __user *buf, size_t count,
 			  loff_t *off)
 {
 	int rv = 0;
 	char *kbuf;
 	char *tmp;

 	if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) {
 		rv = -ENOMEM;
 		goto out;
 	}
 	if (copy_from_user(kbuf, buf, count)) {
 		rv = -EFAULT;
 		goto out;
 	}

 	kbuf[count] = '\0';

 	tmp = strchr(kbuf, ' ');
 	if (!tmp) {
 		rv = -EINVAL;
 		goto out;
 	}
 	*tmp = '\0';
 	tmp++;

 	if (!strcmp(kbuf, "add_node"))
 		rv = do_add_node(tmp, count - (tmp - kbuf));
 	else if (!strcmp(kbuf, "remove_node"))
 		rv = do_remove_node(tmp);
 	else if (!strcmp(kbuf, "add_property"))
 		rv = do_add_property(tmp, count - (tmp - kbuf));
 	else if (!strcmp(kbuf, "remove_property"))
 		rv = do_remove_property(tmp, count - (tmp - kbuf));
 	else if (!strcmp(kbuf, "update_property"))
 		rv = do_update_property(tmp, count - (tmp - kbuf));
 	else
 		rv = -EINVAL;
 out:
 	kfree(kbuf);
 	return rv ? rv : count;
 }

 static const struct file_operations ofdt_fops = {
 	.write = ofdt_write,
 	.llseek = noop_llseek,
 };

 /* create /proc/powerpc/ofdt write-only by root */
 static int proc_ppc64_create_ofdt(void)
 {
 	struct proc_dir_entry *ent;

 	ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops);
 	if (ent)
 		proc_set_size(ent, 0);

 	return 0;
 }
 machine_device_initcall(pseries, proc_ppc64_create_ofdt);
	/*
	* pSeries_reconfig.c - support for dynamic reconfiguration (including PCI
	* Hotplug and Dynamic Logical Partitioning on RPA platforms).
	*
	* Copyright (C) 2005 Nathan Lynch
	* Copyright (C) 2005 IBM Corporation
	*
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License version
	* 2 as published by the Free Software Foundation.
	*/

	#include <linux/kernel.h>
	#include <linux/notifier.h>
	#include <linux/proc_fs.h>
	#include <linux/slab.h>
	#include <linux/of.h>

	#include <asm/prom.h>
	#include <asm/machdep.h>
	#include <linux/uaccess.h>
	#include <asm/mmu.h>

	#include "of_helpers.h"

	static int pSeries_reconfig_add_node(const char path, struct property proplist)
	{
	struct device_node *np;
	int err = -ENOMEM;

	np = kzalloc(sizeof(*np), GFP_KERNEL);
	if (!np)
	goto out_err;

	np->full_name = kstrdup(path, GFP_KERNEL);
	if (!np->full_name)
	goto out_err;

	np->properties = proplist;
	of_node_set_flag(np, OF_DYNAMIC);
	of_node_init(np);

	np->parent = pseries_of_derive_parent(path);
	if (IS_ERR(np->parent)) {
	err = PTR_ERR(np->parent);
	goto out_err;
	}

	err = of_attach_node(np);
	if (err) {
	printk(KERN_ERR "Failed to add device node %s\n", path);
	goto out_err;
	}

	of_node_put(np->parent);

	return 0;

	out_err:
	if (np) {
	of_node_put(np->parent);
	kfree(np->full_name);
	kfree(np);
	}
	return err;
	}

	static int pSeries_reconfig_remove_node(struct device_node *np)
	{
	struct device_node parent, child;

	parent = of_get_parent(np);
	if (!parent)
	return -EINVAL;

	if ((child = of_get_next_child(np, NULL))) {
	of_node_put(child);
	of_node_put(parent);
	return -EBUSY;
	}

	of_detach_node(np);
	of_node_put(parent);
	return 0;
	}

	/*
	* /proc/powerpc/ofdt - yucky binary interface for adding and removing
	* OF device nodes. Should be deprecated as soon as we get an
	* in-kernel wrapper for the RTAS ibm,configure-connector call.
	*/

	static void release_prop_list(const struct property *prop)
	{
	struct property *next;
	for (; prop; prop = next) {
	next = prop->next;
	kfree(prop->name);
	kfree(prop->value);
	kfree(prop);
	}

	}

	/**
	* parse_next_property - process the next property from raw input buffer
	* @buf: input buffer, must be nul-terminated
	* @end: end of the input buffer + 1, for validation
	* @name: return value; set to property name in buf
	* @length: return value; set to length of value
	* @value: return value; set to the property value in buf
	*
	* Note that the caller must make copies of the name and value returned,
	* this function does no allocation or copying of the data. Return value
	* is set to the next name in buf, or NULL on error.
	*/
	static char * parse_next_property(char buf, char end, char *name, int length,
	unsigned char **value)
	{
	char *tmp;

	*name = buf;

	tmp = strchr(buf, ' ');
	if (!tmp) {
	printk(KERN_ERR "property parse failed in %s at line %d\n",
	__func__, __LINE__);
	return NULL;
	}
	*tmp = '\0';

	if (++tmp >= end) {
	printk(KERN_ERR "property parse failed in %s at line %d\n",
	__func__, __LINE__);
	return NULL;
	}

	/* now we're on the length */
	*length = -1;
	*length = simple_strtoul(tmp, &tmp, 10);
	if (*length == -1) {
	printk(KERN_ERR "property parse failed in %s at line %d\n",
	__func__, __LINE__);
	return NULL;
	}
	if (*tmp != ' ' \|\| ++tmp >= end) {
	printk(KERN_ERR "property parse failed in %s at line %d\n",
	__func__, __LINE__);
	return NULL;
	}

	/* now we're on the value */
	*value = tmp;
	tmp += *length;
	if (tmp > end) {
	printk(KERN_ERR "property parse failed in %s at line %d\n",
	__func__, __LINE__);
	return NULL;
	}
	else if (tmp < end && tmp != ' ' && tmp != '\0') {
	printk(KERN_ERR "property parse failed in %s at line %d\n",
	__func__, __LINE__);
	return NULL;
	}
	tmp++;

	/* and now we should be on the next name, or the end */
	return tmp;
	}

	static struct property new_property(const char name, const int length,
	const unsigned char value, struct property last)
	{
	struct property new = kzalloc(sizeof(new), GFP_KERNEL);

	if (!new)
	return NULL;

	if (!(new->name = kstrdup(name, GFP_KERNEL)))
	goto cleanup;
	if (!(new->value = kmalloc(length + 1, GFP_KERNEL)))
	goto cleanup;

	memcpy(new->value, value, length);
	(((char )new->value) + length) = 0;
	new->length = length;
	new->next = last;
	return new;

	cleanup:
	kfree(new->name);
	kfree(new->value);
	kfree(new);
	return NULL;
	}

	static int do_add_node(char *buf, size_t bufsize)
	{
	char path, end, *name;
	struct device_node *np;
	struct property *prop = NULL;
	unsigned char* value;
	int length, rv = 0;

	end = buf + bufsize;
	path = buf;
	buf = strchr(buf, ' ');
	if (!buf)
	return -EINVAL;
	*buf = '\0';
	buf++;

	if ((np = of_find_node_by_path(path))) {
	of_node_put(np);
	return -EINVAL;
	}

	/* rv = build_prop_list(tmp, bufsize - (tmp - buf), &proplist); */
	while (buf < end &&
	(buf = parse_next_property(buf, end, &name, &length, &value))) {
	struct property *last = prop;

	prop = new_property(name, length, value, last);
	if (!prop) {
	rv = -ENOMEM;
	prop = last;
	goto out;
	}
	}
	if (!buf) {
	rv = -EINVAL;
	goto out;
	}

	rv = pSeries_reconfig_add_node(path, prop);

	out:
	if (rv)
	release_prop_list(prop);
	return rv;
	}

	static int do_remove_node(char *buf)
	{
	struct device_node *node;
	int rv = -ENODEV;

	if ((node = of_find_node_by_path(buf)))
	rv = pSeries_reconfig_remove_node(node);

	of_node_put(node);
	return rv;
	}

	static char parse_node(char buf, size_t bufsize, struct device_node **npp)
	{
	char *handle_str;
	phandle handle;
	*npp = NULL;

	handle_str = buf;

	buf = strchr(buf, ' ');
	if (!buf)
	return NULL;
	*buf = '\0';
	buf++;

	handle = simple_strtoul(handle_str, NULL, 0);

	*npp = of_find_node_by_phandle(handle);
	return buf;
	}

	static int do_add_property(char *buf, size_t bufsize)
	{
	struct property *prop = NULL;
	struct device_node *np;
	unsigned char *value;
	char name, end;
	int length;
	end = buf + bufsize;
	buf = parse_node(buf, bufsize, &np);

	if (!np)
	return -ENODEV;

	if (parse_next_property(buf, end, &name, &length, &value) == NULL)
	return -EINVAL;

	prop = new_property(name, length, value, NULL);
	if (!prop)
	return -ENOMEM;

	of_add_property(np, prop);

	return 0;
	}

	static int do_remove_property(char *buf, size_t bufsize)
	{
	struct device_node *np;
	char *tmp;
	buf = parse_node(buf, bufsize, &np);

	if (!np)
	return -ENODEV;

	tmp = strchr(buf,' ');
	if (tmp)
	*tmp = '\0';

	if (strlen(buf) == 0)
	return -EINVAL;

	return of_remove_property(np, of_find_property(np, buf, NULL));
	}

	static int do_update_property(char *buf, size_t bufsize)
	{
	struct device_node *np;
	unsigned char *value;
	char name, end, *next_prop;
	int length;
	struct property *newprop;
	buf = parse_node(buf, bufsize, &np);
	end = buf + bufsize;

	if (!np)
	return -ENODEV;

	next_prop = parse_next_property(buf, end, &name, &length, &value);
	if (!next_prop)
	return -EINVAL;

	if (!strlen(name))
	return -ENODEV;

	newprop = new_property(name, length, value, NULL);
	if (!newprop)
	return -ENOMEM;

	if (!strcmp(name, "slb-size") \|\| !strcmp(name, "ibm,slb-size"))
	slb_set_size((int )value);

	return of_update_property(np, newprop);
	}

	/**
	* ofdt_write - perform operations on the Open Firmware device tree
	*
	* @file: not used
	* @buf: command and arguments
	* @count: size of the command buffer
	* @off: not used
	*
	* Operations supported at this time are addition and removal of
	* whole nodes along with their properties. Operations on individual
	* properties are not implemented (yet).
	*/
	static ssize_t ofdt_write(struct file file, const char __user buf, size_t count,
	loff_t *off)
	{
	int rv = 0;
	char *kbuf;
	char *tmp;

	if (!(kbuf = kmalloc(count + 1, GFP_KERNEL))) {
	rv = -ENOMEM;
	goto out;
	}
	if (copy_from_user(kbuf, buf, count)) {
	rv = -EFAULT;
	goto out;
	}

	kbuf[count] = '\0';

	tmp = strchr(kbuf, ' ');
	if (!tmp) {
	rv = -EINVAL;
	goto out;
	}
	*tmp = '\0';
	tmp++;

	if (!strcmp(kbuf, "add_node"))
	rv = do_add_node(tmp, count - (tmp - kbuf));
	else if (!strcmp(kbuf, "remove_node"))
	rv = do_remove_node(tmp);
	else if (!strcmp(kbuf, "add_property"))
	rv = do_add_property(tmp, count - (tmp - kbuf));
	else if (!strcmp(kbuf, "remove_property"))
	rv = do_remove_property(tmp, count - (tmp - kbuf));
	else if (!strcmp(kbuf, "update_property"))
	rv = do_update_property(tmp, count - (tmp - kbuf));
	else
	rv = -EINVAL;
	out:
	kfree(kbuf);
	return rv ? rv : count;
	}

	static const struct file_operations ofdt_fops = {
	.write = ofdt_write,
	.llseek = noop_llseek,
	};

	/* create /proc/powerpc/ofdt write-only by root */
	static int proc_ppc64_create_ofdt(void)
	{
	struct proc_dir_entry *ent;

	ent = proc_create("powerpc/ofdt", S_IWUSR, NULL, &ofdt_fops);
	if (ent)
	proc_set_size(ent, 0);

	return 0;
	}
	machine_device_initcall(pseries, proc_ppc64_create_ofdt);