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|
/*
* Support for dynamic reconfiguration for PCI, Memory, and CPU
* Hotplug and Dynamic Logical Partitioning on RPA platforms.
*
* Copyright (C) 2009 Nathan Fontenot
* Copyright (C) 2009 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.
*/
#define pr_fmt(fmt) "dlpar: " fmt
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/spinlock.h>
#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/of.h>
#include "of_helpers.h"
#include "pseries.h"
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/rtas.h>
struct workqueue_struct *pseries_hp_wq;
struct pseries_hp_work {
struct work_struct work;
struct pseries_hp_errorlog *errlog;
struct completion *hp_completion;
int *rc;
};
struct cc_workarea {
__be32 drc_index;
__be32 zero;
__be32 name_offset;
__be32 prop_length;
__be32 prop_offset;
};
void dlpar_free_cc_property(struct property *prop)
{
kfree(prop->name);
kfree(prop->value);
kfree(prop);
}
static struct property *dlpar_parse_cc_property(struct cc_workarea *ccwa)
{
struct property *prop;
char *name;
char *value;
prop = kzalloc(sizeof(*prop), GFP_KERNEL);
if (!prop)
return NULL;
name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
prop->name = kstrdup(name, GFP_KERNEL);
prop->length = be32_to_cpu(ccwa->prop_length);
value = (char *)ccwa + be32_to_cpu(ccwa->prop_offset);
prop->value = kmemdup(value, prop->length, GFP_KERNEL);
if (!prop->value) {
dlpar_free_cc_property(prop);
return NULL;
}
return prop;
}
static struct device_node *dlpar_parse_cc_node(struct cc_workarea *ccwa,
const char *path)
{
struct device_node *dn;
char *name;
/* If parent node path is "/" advance path to NULL terminator to
* prevent double leading slashs in full_name.
*/
if (!path[1])
path++;
dn = kzalloc(sizeof(*dn), GFP_KERNEL);
if (!dn)
return NULL;
name = (char *)ccwa + be32_to_cpu(ccwa->name_offset);
dn->full_name = kasprintf(GFP_KERNEL, "%s/%s", path, name);
if (!dn->full_name) {
kfree(dn);
return NULL;
}
of_node_set_flag(dn, OF_DYNAMIC);
of_node_init(dn);
return dn;
}
static void dlpar_free_one_cc_node(struct device_node *dn)
{
struct property *prop;
while (dn->properties) {
prop = dn->properties;
dn->properties = prop->next;
dlpar_free_cc_property(prop);
}
kfree(dn->full_name);
kfree(dn);
}
void dlpar_free_cc_nodes(struct device_node *dn)
{
if (dn->child)
dlpar_free_cc_nodes(dn->child);
if (dn->sibling)
dlpar_free_cc_nodes(dn->sibling);
dlpar_free_one_cc_node(dn);
}
#define COMPLETE 0
#define NEXT_SIBLING 1
#define NEXT_CHILD 2
#define NEXT_PROPERTY 3
#define PREV_PARENT 4
#define MORE_MEMORY 5
#define CALL_AGAIN -2
#define ERR_CFG_USE -9003
struct device_node *dlpar_configure_connector(__be32 drc_index,
struct device_node *parent)
{
struct device_node *dn;
struct device_node *first_dn = NULL;
struct device_node *last_dn = NULL;
struct property *property;
struct property *last_property = NULL;
struct cc_workarea *ccwa;
char *data_buf;
const char *parent_path = parent->full_name;
int cc_token;
int rc = -1;
cc_token = rtas_token("ibm,configure-connector");
if (cc_token == RTAS_UNKNOWN_SERVICE)
return NULL;
data_buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
if (!data_buf)
return NULL;
ccwa = (struct cc_workarea *)&data_buf[0];
ccwa->drc_index = drc_index;
ccwa->zero = 0;
do {
/* Since we release the rtas_data_buf lock between configure
* connector calls we want to re-populate the rtas_data_buffer
* with the contents of the previous call.
*/
spin_lock(&rtas_data_buf_lock);
memcpy(rtas_data_buf, data_buf, RTAS_DATA_BUF_SIZE);
rc = rtas_call(cc_token, 2, 1, NULL, rtas_data_buf, NULL);
memcpy(data_buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
spin_unlock(&rtas_data_buf_lock);
switch (rc) {
case COMPLETE:
break;
case NEXT_SIBLING:
dn = dlpar_parse_cc_node(ccwa, parent_path);
if (!dn)
goto cc_error;
dn->parent = last_dn->parent;
last_dn->sibling = dn;
last_dn = dn;
break;
case NEXT_CHILD:
if (first_dn)
parent_path = last_dn->full_name;
dn = dlpar_parse_cc_node(ccwa, parent_path);
if (!dn)
goto cc_error;
if (!first_dn) {
dn->parent = parent;
first_dn = dn;
} else {
dn->parent = last_dn;
if (last_dn)
last_dn->child = dn;
}
last_dn = dn;
break;
case NEXT_PROPERTY:
property = dlpar_parse_cc_property(ccwa);
if (!property)
goto cc_error;
if (!last_dn->properties)
last_dn->properties = property;
else
last_property->next = property;
last_property = property;
break;
case PREV_PARENT:
last_dn = last_dn->parent;
parent_path = last_dn->parent->full_name;
break;
case CALL_AGAIN:
break;
case MORE_MEMORY:
case ERR_CFG_USE:
default:
printk(KERN_ERR "Unexpected Error (%d) "
"returned from configure-connector\n", rc);
goto cc_error;
}
} while (rc);
cc_error:
kfree(data_buf);
if (rc) {
if (first_dn)
dlpar_free_cc_nodes(first_dn);
return NULL;
}
return first_dn;
}
int dlpar_attach_node(struct device_node *dn)
{
int rc;
dn->parent = pseries_of_derive_parent(dn->full_name);
if (IS_ERR(dn->parent))
return PTR_ERR(dn->parent);
rc = of_attach_node(dn);
if (rc) {
printk(KERN_ERR "Failed to add device node %s\n",
dn->full_name);
return rc;
}
of_node_put(dn->parent);
return 0;
}
int dlpar_detach_node(struct device_node *dn)
{
struct device_node *child;
int rc;
child = of_get_next_child(dn, NULL);
while (child) {
dlpar_detach_node(child);
child = of_get_next_child(dn, child);
}
rc = of_detach_node(dn);
if (rc)
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