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4edd7ceff0
__remove_pages() is only necessary for CONFIG_MEMORY_HOTREMOVE. PowerPC pseries will return -EOPNOTSUPP if unsupported. Adding an #ifdef causes several other functions it depends on to also become unnecessary, which saves in .text when disabled (it's disabled in most defconfigs besides powerpc, including x86). remove_memory_block() becomes static since it is not referenced outside of drivers/base/memory.c. Build tested on x86 and powerpc with CONFIG_MEMORY_HOTREMOVE both enabled and disabled. Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: Toshi Kani <toshi.kani@hp.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Wen Congyang <wency@cn.fujitsu.com> Cc: Tang Chen <tangchen@cn.fujitsu.com> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
281 lines
6.8 KiB
C
281 lines
6.8 KiB
C
/*
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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 <linux/memblock.h>
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#include <linux/vmalloc.h>
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#include <linux/memory.h>
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#include <asm/firmware.h>
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#include <asm/machdep.h>
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#include <asm/sparsemem.h>
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static unsigned long get_memblock_size(void)
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{
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struct device_node *np;
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unsigned int memblock_size = MIN_MEMORY_BLOCK_SIZE;
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struct resource r;
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np = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
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if (np) {
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const __be64 *size;
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size = of_get_property(np, "ibm,lmb-size", NULL);
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if (size)
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memblock_size = be64_to_cpup(size);
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of_node_put(np);
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} else if (machine_is(pseries)) {
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/* This fallback really only applies to pseries */
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unsigned int memzero_size = 0;
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np = of_find_node_by_path("/memory@0");
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if (np) {
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if (!of_address_to_resource(np, 0, &r))
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memzero_size = resource_size(&r);
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of_node_put(np);
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}
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if (memzero_size) {
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/* We now know the size of memory@0, use this to find
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* the first memoryblock and get its size.
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*/
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char buf[64];
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sprintf(buf, "/memory@%x", memzero_size);
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np = of_find_node_by_path(buf);
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if (np) {
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if (!of_address_to_resource(np, 0, &r))
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memblock_size = resource_size(&r);
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of_node_put(np);
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}
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}
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}
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return memblock_size;
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}
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/* WARNING: This is going to override the generic definition whenever
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* pseries is built-in regardless of what platform is active at boot
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* time. This is fine for now as this is the only "option" and it
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* should work everywhere. If not, we'll have to turn this into a
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* ppc_md. callback
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*/
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unsigned long memory_block_size_bytes(void)
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{
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return get_memblock_size();
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}
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#ifdef CONFIG_MEMORY_HOTREMOVE
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static int pseries_remove_memblock(unsigned long base, unsigned int memblock_size)
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{
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unsigned long start, start_pfn;
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struct zone *zone;
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int ret;
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unsigned long section;
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unsigned long sections_to_remove;
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start_pfn = base >> PAGE_SHIFT;
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if (!pfn_valid(start_pfn)) {
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memblock_remove(base, memblock_size);
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return 0;
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}
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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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sections_to_remove = (memblock_size >> PAGE_SHIFT) / PAGES_PER_SECTION;
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for (section = 0; section < sections_to_remove; section++) {
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unsigned long pfn = start_pfn + section * PAGES_PER_SECTION;
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ret = __remove_pages(zone, pfn, PAGES_PER_SECTION);
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if (ret)
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return ret;
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}
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/*
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* Update memory regions for memory remove
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*/
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memblock_remove(base, memblock_size);
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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(base);
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ret = remove_section_mapping(start, start + memblock_size);
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/* Ensure all vmalloc mappings are flushed in case they also
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* hit that section of memory
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*/
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vm_unmap_aliases();
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return ret;
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}
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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 *regs;
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unsigned long base;
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unsigned int lmb_size;
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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 bae address and size of the memblock
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*/
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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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base = *(unsigned long *)regs;
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lmb_size = regs[3];
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ret = pseries_remove_memblock(base, lmb_size);
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return ret;
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}
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#else
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static inline int pseries_remove_memblock(unsigned long base,
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unsigned int memblock_size)
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{
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return -EOPNOTSUPP;
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}
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static inline int pseries_remove_memory(struct device_node *np)
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{
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return -EOPNOTSUPP;
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}
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#endif /* CONFIG_MEMORY_HOTREMOVE */
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static int pseries_add_memory(struct device_node *np)
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{
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const char *type;
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const unsigned int *regs;
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unsigned long base;
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unsigned int lmb_size;
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int ret = -EINVAL;
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/*
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* Check to see if we are actually adding 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 base and size of the memblock
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*/
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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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base = *(unsigned long *)regs;
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lmb_size = regs[3];
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/*
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* Update memory region to represent the memory add
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*/
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ret = memblock_add(base, lmb_size);
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return (ret < 0) ? -EINVAL : 0;
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}
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static int pseries_update_drconf_memory(struct of_prop_reconfig *pr)
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{
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struct of_drconf_cell *new_drmem, *old_drmem;
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unsigned long memblock_size;
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u32 entries;
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u32 *p;
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int i, rc = -EINVAL;
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memblock_size = get_memblock_size();
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if (!memblock_size)
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return -EINVAL;
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p = (u32 *)of_get_property(pr->dn, "ibm,dynamic-memory", NULL);
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if (!p)
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return -EINVAL;
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/* The first int of the property is the number of lmb's described
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* by the property. This is followed by an array of of_drconf_cell
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* entries. Get the niumber of entries and skip to the array of
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* of_drconf_cell's.
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*/
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entries = *p++;
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old_drmem = (struct of_drconf_cell *)p;
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p = (u32 *)pr->prop->value;
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p++;
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new_drmem = (struct of_drconf_cell *)p;
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for (i = 0; i < entries; i++) {
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if ((old_drmem[i].flags & DRCONF_MEM_ASSIGNED) &&
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(!(new_drmem[i].flags & DRCONF_MEM_ASSIGNED))) {
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rc = pseries_remove_memblock(old_drmem[i].base_addr,
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memblock_size);
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break;
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} else if ((!(old_drmem[i].flags & DRCONF_MEM_ASSIGNED)) &&
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(new_drmem[i].flags & DRCONF_MEM_ASSIGNED)) {
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rc = memblock_add(old_drmem[i].base_addr,
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memblock_size);
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rc = (rc < 0) ? -EINVAL : 0;
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break;
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}
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}
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return rc;
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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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struct of_prop_reconfig *pr;
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int err = 0;
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switch (action) {
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case OF_RECONFIG_ATTACH_NODE:
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err = pseries_add_memory(node);
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break;
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case OF_RECONFIG_DETACH_NODE:
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err = pseries_remove_memory(node);
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break;
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case OF_RECONFIG_UPDATE_PROPERTY:
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pr = (struct of_prop_reconfig *)node;
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if (!strcmp(pr->prop->name, "ibm,dynamic-memory"))
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err = pseries_update_drconf_memory(pr);
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break;
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}
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return notifier_from_errno(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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of_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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