forked from luck/tmp_suning_uos_patched
91eea67c6d
We need to keep track of the backing pages that get allocated by
vmemmap_populate() so that when we use kdump, the dump-capture kernel knows
where these pages are.
We use a simple linked list of structures that contain the physical address
of the backing page and corresponding virtual address to track the backing
pages.
To save space, we just use a pointer to the next struct vmemmap_backing. We
can also do this because we never remove nodes. We call the pointer "list"
to be compatible with changes made to the crash utility.
vmemmap_populate() is called either at boot-time or on a memory hotplug
operation. We don't have to worry about the boot-time calls because they
will be inherently single-threaded, and for a memory hotplug operation
vmemmap_populate() is called through:
sparse_add_one_section()
|
V
kmalloc_section_memmap()
|
V
sparse_mem_map_populate()
|
V
vmemmap_populate()
and in sparse_add_one_section() we're protected by pgdat_resize_lock().
So, we don't need a spinlock to protect the vmemmap_list.
We allocate space for the vmemmap_backing structs by allocating whole pages
in vmemmap_list_alloc() and then handing out chunks of this to
vmemmap_list_populate().
This means that we waste at most just under one page, but this keeps the code
is simple.
Signed-off-by: Mark Nelson <markn@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
331 lines
9.2 KiB
C
331 lines
9.2 KiB
C
/*
|
|
* PowerPC version
|
|
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
|
|
*
|
|
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
|
|
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
|
|
* Copyright (C) 1996 Paul Mackerras
|
|
*
|
|
* Derived from "arch/i386/mm/init.c"
|
|
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
|
*
|
|
* Dave Engebretsen <engebret@us.ibm.com>
|
|
* Rework for PPC64 port.
|
|
*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
#undef DEBUG
|
|
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/module.h>
|
|
#include <linux/poison.h>
|
|
#include <linux/lmb.h>
|
|
#include <linux/hugetlb.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/eeh.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmzone.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/system.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <asm/vdso.h>
|
|
|
|
#include "mmu_decl.h"
|
|
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
#if PGTABLE_RANGE > USER_VSID_RANGE
|
|
#warning Limited user VSID range means pagetable space is wasted
|
|
#endif
|
|
|
|
#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
|
|
#warning TASK_SIZE is smaller than it needs to be.
|
|
#endif
|
|
#endif /* CONFIG_PPC_STD_MMU_64 */
|
|
|
|
phys_addr_t memstart_addr = ~0;
|
|
phys_addr_t kernstart_addr;
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long addr;
|
|
|
|
addr = (unsigned long)__init_begin;
|
|
for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
|
|
memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk ("Freeing unused kernel memory: %luk freed\n",
|
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (start < end)
|
|
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
|
|
for (; start < end; start += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(start));
|
|
init_page_count(virt_to_page(start));
|
|
free_page(start);
|
|
totalram_pages++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void pgd_ctor(void *addr)
|
|
{
|
|
memset(addr, 0, PGD_TABLE_SIZE);
|
|
}
|
|
|
|
static void pmd_ctor(void *addr)
|
|
{
|
|
memset(addr, 0, PMD_TABLE_SIZE);
|
|
}
|
|
|
|
struct kmem_cache *pgtable_cache[MAX_PGTABLE_INDEX_SIZE];
|
|
|
|
/*
|
|
* Create a kmem_cache() for pagetables. This is not used for PTE
|
|
* pages - they're linked to struct page, come from the normal free
|
|
* pages pool and have a different entry size (see real_pte_t) to
|
|
* everything else. Caches created by this function are used for all
|
|
* the higher level pagetables, and for hugepage pagetables.
|
|
*/
|
|
void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
|
|
{
|
|
char *name;
|
|
unsigned long table_size = sizeof(void *) << shift;
|
|
unsigned long align = table_size;
|
|
|
|
/* When batching pgtable pointers for RCU freeing, we store
|
|
* the index size in the low bits. Table alignment must be
|
|
* big enough to fit it.
|
|
*
|
|
* Likewise, hugeapge pagetable pointers contain a (different)
|
|
* shift value in the low bits. All tables must be aligned so
|
|
* as to leave enough 0 bits in the address to contain it. */
|
|
unsigned long minalign = max(MAX_PGTABLE_INDEX_SIZE + 1,
|
|
HUGEPD_SHIFT_MASK + 1);
|
|
struct kmem_cache *new;
|
|
|
|
/* It would be nice if this was a BUILD_BUG_ON(), but at the
|
|
* moment, gcc doesn't seem to recognize is_power_of_2 as a
|
|
* constant expression, so so much for that. */
|
|
BUG_ON(!is_power_of_2(minalign));
|
|
BUG_ON((shift < 1) || (shift > MAX_PGTABLE_INDEX_SIZE));
|
|
|
|
if (PGT_CACHE(shift))
|
|
return; /* Already have a cache of this size */
|
|
|
|
align = max_t(unsigned long, align, minalign);
|
|
name = kasprintf(GFP_KERNEL, "pgtable-2^%d", shift);
|
|
new = kmem_cache_create(name, table_size, align, 0, ctor);
|
|
PGT_CACHE(shift) = new;
|
|
|
|
pr_debug("Allocated pgtable cache for order %d\n", shift);
|
|
}
|
|
|
|
|
|
void pgtable_cache_init(void)
|
|
{
|
|
pgtable_cache_add(PGD_INDEX_SIZE, pgd_ctor);
|
|
pgtable_cache_add(PMD_INDEX_SIZE, pmd_ctor);
|
|
if (!PGT_CACHE(PGD_INDEX_SIZE) || !PGT_CACHE(PMD_INDEX_SIZE))
|
|
panic("Couldn't allocate pgtable caches");
|
|
|
|
/* In all current configs, when the PUD index exists it's the
|
|
* same size as either the pgd or pmd index. Verify that the
|
|
* initialization above has also created a PUD cache. This
|
|
* will need re-examiniation if we add new possibilities for
|
|
* the pagetable layout. */
|
|
BUG_ON(PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE));
|
|
}
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
/*
|
|
* Given an address within the vmemmap, determine the pfn of the page that
|
|
* represents the start of the section it is within. Note that we have to
|
|
* do this by hand as the proffered address may not be correctly aligned.
|
|
* Subtraction of non-aligned pointers produces undefined results.
|
|
*/
|
|
static unsigned long __meminit vmemmap_section_start(unsigned long page)
|
|
{
|
|
unsigned long offset = page - ((unsigned long)(vmemmap));
|
|
|
|
/* Return the pfn of the start of the section. */
|
|
return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
|
|
}
|
|
|
|
/*
|
|
* Check if this vmemmap page is already initialised. If any section
|
|
* which overlaps this vmemmap page is initialised then this page is
|
|
* initialised already.
|
|
*/
|
|
static int __meminit vmemmap_populated(unsigned long start, int page_size)
|
|
{
|
|
unsigned long end = start + page_size;
|
|
|
|
for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
|
|
if (pfn_valid(vmemmap_section_start(start)))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* On hash-based CPUs, the vmemmap is bolted in the hash table.
|
|
*
|
|
* On Book3E CPUs, the vmemmap is currently mapped in the top half of
|
|
* the vmalloc space using normal page tables, though the size of
|
|
* pages encoded in the PTEs can be different
|
|
*/
|
|
|
|
#ifdef CONFIG_PPC_BOOK3E
|
|
static void __meminit vmemmap_create_mapping(unsigned long start,
|
|
unsigned long page_size,
|
|
unsigned long phys)
|
|
{
|
|
/* Create a PTE encoding without page size */
|
|
unsigned long i, flags = _PAGE_PRESENT | _PAGE_ACCESSED |
|
|
_PAGE_KERNEL_RW;
|
|
|
|
/* PTEs only contain page size encodings up to 32M */
|
|
BUG_ON(mmu_psize_defs[mmu_vmemmap_psize].enc > 0xf);
|
|
|
|
/* Encode the size in the PTE */
|
|
flags |= mmu_psize_defs[mmu_vmemmap_psize].enc << 8;
|
|
|
|
/* For each PTE for that area, map things. Note that we don't
|
|
* increment phys because all PTEs are of the large size and
|
|
* thus must have the low bits clear
|
|
*/
|
|
for (i = 0; i < page_size; i += PAGE_SIZE)
|
|
BUG_ON(map_kernel_page(start + i, phys, flags));
|
|
}
|
|
#else /* CONFIG_PPC_BOOK3E */
|
|
static void __meminit vmemmap_create_mapping(unsigned long start,
|
|
unsigned long page_size,
|
|
unsigned long phys)
|
|
{
|
|
int mapped = htab_bolt_mapping(start, start + page_size, phys,
|
|
PAGE_KERNEL, mmu_vmemmap_psize,
|
|
mmu_kernel_ssize);
|
|
BUG_ON(mapped < 0);
|
|
}
|
|
#endif /* CONFIG_PPC_BOOK3E */
|
|
|
|
struct vmemmap_backing *vmemmap_list;
|
|
|
|
static __meminit struct vmemmap_backing * vmemmap_list_alloc(int node)
|
|
{
|
|
static struct vmemmap_backing *next;
|
|
static int num_left;
|
|
|
|
/* allocate a page when required and hand out chunks */
|
|
if (!next || !num_left) {
|
|
next = vmemmap_alloc_block(PAGE_SIZE, node);
|
|
if (unlikely(!next)) {
|
|
WARN_ON(1);
|
|
return NULL;
|
|
}
|
|
num_left = PAGE_SIZE / sizeof(struct vmemmap_backing);
|
|
}
|
|
|
|
num_left--;
|
|
|
|
return next++;
|
|
}
|
|
|
|
static __meminit void vmemmap_list_populate(unsigned long phys,
|
|
unsigned long start,
|
|
int node)
|
|
{
|
|
struct vmemmap_backing *vmem_back;
|
|
|
|
vmem_back = vmemmap_list_alloc(node);
|
|
if (unlikely(!vmem_back)) {
|
|
WARN_ON(1);
|
|
return;
|
|
}
|
|
|
|
vmem_back->phys = phys;
|
|
vmem_back->virt_addr = start;
|
|
vmem_back->list = vmemmap_list;
|
|
|
|
vmemmap_list = vmem_back;
|
|
}
|
|
|
|
int __meminit vmemmap_populate(struct page *start_page,
|
|
unsigned long nr_pages, int node)
|
|
{
|
|
unsigned long start = (unsigned long)start_page;
|
|
unsigned long end = (unsigned long)(start_page + nr_pages);
|
|
unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
|
|
|
|
/* Align to the page size of the linear mapping. */
|
|
start = _ALIGN_DOWN(start, page_size);
|
|
|
|
pr_debug("vmemmap_populate page %p, %ld pages, node %d\n",
|
|
start_page, nr_pages, node);
|
|
pr_debug(" -> map %lx..%lx\n", start, end);
|
|
|
|
for (; start < end; start += page_size) {
|
|
void *p;
|
|
|
|
if (vmemmap_populated(start, page_size))
|
|
continue;
|
|
|
|
p = vmemmap_alloc_block(page_size, node);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
vmemmap_list_populate(__pa(p), start, node);
|
|
|
|
pr_debug(" * %016lx..%016lx allocated at %p\n",
|
|
start, start + page_size, p);
|
|
|
|
vmemmap_create_mapping(start, page_size, __pa(p));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|