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/*
* pseries Memory Hotplug infrastructure.
*
* Copyright (C) 2008 Badari Pulavarty, IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/of.h>
#include <linux/lmb.h>
#include <asm/firmware.h>
#include <asm/machdep.h>
#include <asm/pSeries_reconfig.h>
static int pseries_remove_memory(struct device_node *np)
{
const char *type;
const unsigned int *my_index;
const unsigned int *regs;
u64 start_pfn, start;
struct zone *zone;
int ret = -EINVAL;
/*
* Check to see if we are actually removing memory
*/
type = of_get_property(np, "device_type", NULL);
if (type == NULL || strcmp(type, "memory") != 0)
return 0;
/*
* Find the memory index and size of the removing section
*/
my_index = of_get_property(np, "ibm,my-drc-index", NULL);
if (!my_index)
return ret;
regs = of_get_property(np, "reg", NULL);
if (!regs)
return ret;
start_pfn = section_nr_to_pfn(*my_index & 0xffff);
zone = page_zone(pfn_to_page(start_pfn));
/*
* Remove section mappings and sysfs entries for the
* section of the memory we are removing.
*
* NOTE: Ideally, this should be done in generic code like
* remove_memory(). But remove_memory() gets called by writing
* to sysfs "state" file and we can't remove sysfs entries
* while writing to it. So we have to defer it to here.
*/
ret = __remove_pages(zone, start_pfn, regs[3] >> PAGE_SHIFT);
if (ret)
return ret;
/*
* Update memory regions for memory remove
*/
lmb_remove(start_pfn << PAGE_SHIFT, regs[3]);
/*
* Remove htab bolted mappings for this section of memory
*/
start = (unsigned long)__va(start_pfn << PAGE_SHIFT);
ret = remove_section_mapping(start, start + regs[3]);
return ret;
}
static int pseries_add_memory(struct device_node *np)
{
const char *type;
const unsigned int *my_index;
const unsigned int *regs;
u64 start_pfn;
int ret = -EINVAL;
/*
* Check to see if we are actually adding memory
*/
type = of_get_property(np, "device_type", NULL);
if (type == NULL || strcmp(type, "memory") != 0)
return 0;
/*
* Find the memory index and size of the added section
*/
my_index = of_get_property(np, "ibm,my-drc-index", NULL);
if (!my_index)
return ret;
regs = of_get_property(np, "reg", NULL);
if (!regs)
return ret;
start_pfn = section_nr_to_pfn(*my_index & 0xffff);
/*
* Update memory region to represent the memory add
*/
lmb_add(start_pfn << PAGE_SHIFT, regs[3]);
return 0;
}
static int pseries_memory_notifier(struct notifier_block *nb,
unsigned long action, void *node)
{
int err = NOTIFY_OK;
switch (action) {
case PSERIES_RECONFIG_ADD:
if (pseries_add_memory(node))
err = NOTIFY_BAD;
break;
case PSERIES_RECONFIG_REMOVE:
if (pseries_remove_memory(node))
err = NOTIFY_BAD;
break;
default:
err = NOTIFY_DONE;
break;
}
return err;
}
static struct notifier_block pseries_mem_nb = {
.notifier_call = pseries_memory_notifier,
};
static int __init pseries_memory_hotplug_init(void)
{
if (firmware_has_feature(FW_FEATURE_LPAR))
pSeries_reconfig_notifier_register(&pseries_mem_nb);
return 0;
}
machine_device_initcall(pseries, pseries_memory_hotplug_init);
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