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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/memblock.h>
#include <linux/vmalloc.h>
#include <linux/memory.h>
#include <asm/firmware.h>
#include <asm/machdep.h>
#include <asm/pSeries_reconfig.h>
#include <asm/sparsemem.h>
static unsigned long get_memblock_size(void)
{
struct device_node *np;
unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE;
struct resource r;
np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
if (np) {
const __be64 *size;
size = of_get_property(np, "ibm,lmb-size", NULL);
if (size)
memblock_size = be64_to_cpup(size);
of_node_put(np);
} else if (machine_is(pseries)) {
/* This fallback really only applies to pseries */
unsigned int memzero_size = 0;
np = of_find_node_by_path("/memory@0");
if (np) {
if (!of_address_to_resource(np, 0, &r))
memzero_size = resource_size(&r);
of_node_put(np);
}
if (memzero_size) {
/* We now know the size of memory@0, use this to find
* the first memoryblock and get its size.
*/
char buf[64];
sprintf(buf, "/memory@%x", memzero_size);
np = of_find_node_by_path(buf);
if (np) {
if (!of_address_to_resource(np, 0, &r))
memblock_size = resource_size(&r);
of_node_put(np);
}
}
}
return memblock_size;
}
/* WARNING: This is going to override the generic definition whenever
* pseries is built-in regardless of what platform is active at boot
* time. This is fine for now as this is the only "option" and it
* should work everywhere. If not, we'll have to turn this into a
* ppc_md. callback
*/
unsigned long memory_block_size_bytes(void)
{
return get_memblock_size();
}
static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size)
{
unsigned long start, start_pfn;
struct zone *zone;
int ret;
unsigned long section;
unsigned long sections_to_remove;
start_pfn = base >> PAGE_SHIFT;
if (!pfn_valid(start_pfn)) {
memblock_remove(base, memblock_size);
return 0;
}
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.
*/
sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
for (section = 0; section < sections_to_remove; section++) {
unsigned long pfn = start_pfn + section * PAGES_PER_SECTION;
ret = __remove_pages(zone, pfn, PAGES_PER_SECTION);
if (ret)
return ret;
}
/*
* Update memory regions for memory remove
*/
memblock_remove(base, memblock_size);
/*
* Remove htab bolted mappings for this section of memory
*/
start = (unsigned long)__va(base);
ret = remove_section_mapping(start, start + memblock_size);
/* Ensure all vmalloc mappings are flushed in case they also
* hit that section of memory
*/
vm_unmap_aliases();
return ret;
}
static int pseries_remove_memory(struct device_node *np)
{
const char *type;
const unsigned int *regs;
unsigned long base;
unsigned int lmb_size;
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 bae address and size of the memblock
*/
regs = of_get_property(np, "reg", NULL);
if (!regs)
return ret;
base = *(unsigned long *)regs;
lmb_size = regs[3];
ret = pseries_remove_memblock(base, lmb_size);
return ret;
}
static int pseries_add_memory(struct device_node *np)
{
const char *type;
const unsigned int *regs;
unsigned long base;
unsigned int lmb_size;
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 base and size of the memblock
*/
regs = of_get_property(np, "reg", NULL);
if (!regs)
return ret;
base = *(unsigned long *)regs;
lmb_size = regs[3];
/*
* Update memory region to represent the memory add
*/
ret = memblock_add(base, lmb_size);
return (ret < 0) ? -EINVAL : 0;
}
static int pseries_drconf_memory(unsigned long *base, unsigned int action)
{
unsigned long memblock_size;
int rc;
memblock_size = get_memblock_size();
if (!memblock_size)
return -EINVAL;
if (action == PSERIES_DRCONF_MEM_ADD) {
rc = memblock_add(*base, memblock_size);
rc = (rc < 0) ? -EINVAL : 0;
} else if (action == PSERIES_DRCONF_MEM_REMOVE) {
rc = pseries_remove_memblock(*base, memblock_size);
} else {
rc = -EINVAL;
}
return rc;
}
static int pseries_memory_notifier(struct notifier_block *nb,
unsigned long action, void *node)
{
int err = 0;
switch (action) {
case PSERIES_RECONFIG_ADD:
err = pseries_add_memory(node);
break;
case PSERIES_RECONFIG_REMOVE:
err = pseries_remove_memory(node);
break;
case PSERIES_DRCONF_MEM_ADD:
case PSERIES_DRCONF_MEM_REMOVE:
err = pseries_drconf_memory(node, action);
break;
}
return notifier_from_errno(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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