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