forked from Minki/linux
c459ce8b5a
Initial fix for making sure that we can access percpu variables
in all C code (commit: 10617bbe84)
inadvertantly allocated the memory in the "percpu" section of
the vmlinux ELF executable. This confused kexec/dump.
Signed-off-by: Tony Luck <tony.luck@intel.com>
294 lines
7.6 KiB
C
294 lines
7.6 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 1998-2003 Hewlett-Packard Co
|
|
* David Mosberger-Tang <davidm@hpl.hp.com>
|
|
* Stephane Eranian <eranian@hpl.hp.com>
|
|
* Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
|
|
* Copyright (C) 1999 VA Linux Systems
|
|
* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
|
|
* Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
|
|
*
|
|
* Routines used by ia64 machines with contiguous (or virtually contiguous)
|
|
* memory.
|
|
*/
|
|
#include <linux/bootmem.h>
|
|
#include <linux/efi.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/swap.h>
|
|
|
|
#include <asm/meminit.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/mca.h>
|
|
|
|
#ifdef CONFIG_VIRTUAL_MEM_MAP
|
|
static unsigned long max_gap;
|
|
#endif
|
|
|
|
/**
|
|
* show_mem - give short summary of memory stats
|
|
*
|
|
* Shows a simple page count of reserved and used pages in the system.
|
|
* For discontig machines, it does this on a per-pgdat basis.
|
|
*/
|
|
void show_mem(void)
|
|
{
|
|
int i, total_reserved = 0;
|
|
int total_shared = 0, total_cached = 0;
|
|
unsigned long total_present = 0;
|
|
pg_data_t *pgdat;
|
|
|
|
printk(KERN_INFO "Mem-info:\n");
|
|
show_free_areas();
|
|
printk(KERN_INFO "Node memory in pages:\n");
|
|
for_each_online_pgdat(pgdat) {
|
|
unsigned long present;
|
|
unsigned long flags;
|
|
int shared = 0, cached = 0, reserved = 0;
|
|
|
|
pgdat_resize_lock(pgdat, &flags);
|
|
present = pgdat->node_present_pages;
|
|
for(i = 0; i < pgdat->node_spanned_pages; i++) {
|
|
struct page *page;
|
|
if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
|
|
touch_nmi_watchdog();
|
|
if (pfn_valid(pgdat->node_start_pfn + i))
|
|
page = pfn_to_page(pgdat->node_start_pfn + i);
|
|
else {
|
|
#ifdef CONFIG_VIRTUAL_MEM_MAP
|
|
if (max_gap < LARGE_GAP)
|
|
continue;
|
|
#endif
|
|
i = vmemmap_find_next_valid_pfn(pgdat->node_id,
|
|
i) - 1;
|
|
continue;
|
|
}
|
|
if (PageReserved(page))
|
|
reserved++;
|
|
else if (PageSwapCache(page))
|
|
cached++;
|
|
else if (page_count(page))
|
|
shared += page_count(page)-1;
|
|
}
|
|
pgdat_resize_unlock(pgdat, &flags);
|
|
total_present += present;
|
|
total_reserved += reserved;
|
|
total_cached += cached;
|
|
total_shared += shared;
|
|
printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
|
|
"shrd: %10d, swpd: %10d\n", pgdat->node_id,
|
|
present, reserved, shared, cached);
|
|
}
|
|
printk(KERN_INFO "%ld pages of RAM\n", total_present);
|
|
printk(KERN_INFO "%d reserved pages\n", total_reserved);
|
|
printk(KERN_INFO "%d pages shared\n", total_shared);
|
|
printk(KERN_INFO "%d pages swap cached\n", total_cached);
|
|
printk(KERN_INFO "Total of %ld pages in page table cache\n",
|
|
quicklist_total_size());
|
|
printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
|
|
}
|
|
|
|
|
|
/* physical address where the bootmem map is located */
|
|
unsigned long bootmap_start;
|
|
|
|
/**
|
|
* find_bootmap_location - callback to find a memory area for the bootmap
|
|
* @start: start of region
|
|
* @end: end of region
|
|
* @arg: unused callback data
|
|
*
|
|
* Find a place to put the bootmap and return its starting address in
|
|
* bootmap_start. This address must be page-aligned.
|
|
*/
|
|
static int __init
|
|
find_bootmap_location (unsigned long start, unsigned long end, void *arg)
|
|
{
|
|
unsigned long needed = *(unsigned long *)arg;
|
|
unsigned long range_start, range_end, free_start;
|
|
int i;
|
|
|
|
#if IGNORE_PFN0
|
|
if (start == PAGE_OFFSET) {
|
|
start += PAGE_SIZE;
|
|
if (start >= end)
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
free_start = PAGE_OFFSET;
|
|
|
|
for (i = 0; i < num_rsvd_regions; i++) {
|
|
range_start = max(start, free_start);
|
|
range_end = min(end, rsvd_region[i].start & PAGE_MASK);
|
|
|
|
free_start = PAGE_ALIGN(rsvd_region[i].end);
|
|
|
|
if (range_end <= range_start)
|
|
continue; /* skip over empty range */
|
|
|
|
if (range_end - range_start >= needed) {
|
|
bootmap_start = __pa(range_start);
|
|
return -1; /* done */
|
|
}
|
|
|
|
/* nothing more available in this segment */
|
|
if (range_end == end)
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static void *cpu_data;
|
|
/**
|
|
* per_cpu_init - setup per-cpu variables
|
|
*
|
|
* Allocate and setup per-cpu data areas.
|
|
*/
|
|
void * __cpuinit
|
|
per_cpu_init (void)
|
|
{
|
|
int cpu;
|
|
static int first_time=1;
|
|
|
|
/*
|
|
* get_free_pages() cannot be used before cpu_init() done. BSP
|
|
* allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
|
|
* get_zeroed_page().
|
|
*/
|
|
if (first_time) {
|
|
void *cpu0_data = __cpu0_per_cpu;
|
|
|
|
first_time=0;
|
|
|
|
__per_cpu_offset[0] = (char *) cpu0_data - __per_cpu_start;
|
|
per_cpu(local_per_cpu_offset, 0) = __per_cpu_offset[0];
|
|
|
|
for (cpu = 1; cpu < NR_CPUS; cpu++) {
|
|
memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
|
|
__per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
|
|
cpu_data += PERCPU_PAGE_SIZE;
|
|
per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
|
|
}
|
|
}
|
|
return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
|
|
}
|
|
|
|
static inline void
|
|
alloc_per_cpu_data(void)
|
|
{
|
|
cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS-1,
|
|
PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
|
|
}
|
|
#else
|
|
#define alloc_per_cpu_data() do { } while (0)
|
|
#endif /* CONFIG_SMP */
|
|
|
|
/**
|
|
* find_memory - setup memory map
|
|
*
|
|
* Walk the EFI memory map and find usable memory for the system, taking
|
|
* into account reserved areas.
|
|
*/
|
|
void __init
|
|
find_memory (void)
|
|
{
|
|
unsigned long bootmap_size;
|
|
|
|
reserve_memory();
|
|
|
|
/* first find highest page frame number */
|
|
min_low_pfn = ~0UL;
|
|
max_low_pfn = 0;
|
|
efi_memmap_walk(find_max_min_low_pfn, NULL);
|
|
max_pfn = max_low_pfn;
|
|
/* how many bytes to cover all the pages */
|
|
bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
|
|
|
|
/* look for a location to hold the bootmap */
|
|
bootmap_start = ~0UL;
|
|
efi_memmap_walk(find_bootmap_location, &bootmap_size);
|
|
if (bootmap_start == ~0UL)
|
|
panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
|
|
|
|
bootmap_size = init_bootmem_node(NODE_DATA(0),
|
|
(bootmap_start >> PAGE_SHIFT), 0, max_pfn);
|
|
|
|
/* Free all available memory, then mark bootmem-map as being in use. */
|
|
efi_memmap_walk(filter_rsvd_memory, free_bootmem);
|
|
reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
|
|
|
|
find_initrd();
|
|
|
|
alloc_per_cpu_data();
|
|
}
|
|
|
|
static int
|
|
count_pages (u64 start, u64 end, void *arg)
|
|
{
|
|
unsigned long *count = arg;
|
|
|
|
*count += (end - start) >> PAGE_SHIFT;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set up the page tables.
|
|
*/
|
|
|
|
void __init
|
|
paging_init (void)
|
|
{
|
|
unsigned long max_dma;
|
|
unsigned long max_zone_pfns[MAX_NR_ZONES];
|
|
|
|
num_physpages = 0;
|
|
efi_memmap_walk(count_pages, &num_physpages);
|
|
|
|
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
|
|
#ifdef CONFIG_ZONE_DMA
|
|
max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
|
|
max_zone_pfns[ZONE_DMA] = max_dma;
|
|
#endif
|
|
max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
|
|
|
|
#ifdef CONFIG_VIRTUAL_MEM_MAP
|
|
efi_memmap_walk(filter_memory, register_active_ranges);
|
|
efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
|
|
if (max_gap < LARGE_GAP) {
|
|
vmem_map = (struct page *) 0;
|
|
free_area_init_nodes(max_zone_pfns);
|
|
} else {
|
|
unsigned long map_size;
|
|
|
|
/* allocate virtual_mem_map */
|
|
|
|
map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
|
|
sizeof(struct page));
|
|
vmalloc_end -= map_size;
|
|
vmem_map = (struct page *) vmalloc_end;
|
|
efi_memmap_walk(create_mem_map_page_table, NULL);
|
|
|
|
/*
|
|
* alloc_node_mem_map makes an adjustment for mem_map
|
|
* which isn't compatible with vmem_map.
|
|
*/
|
|
NODE_DATA(0)->node_mem_map = vmem_map +
|
|
find_min_pfn_with_active_regions();
|
|
free_area_init_nodes(max_zone_pfns);
|
|
|
|
printk("Virtual mem_map starts at 0x%p\n", mem_map);
|
|
}
|
|
#else /* !CONFIG_VIRTUAL_MEM_MAP */
|
|
add_active_range(0, 0, max_low_pfn);
|
|
free_area_init_nodes(max_zone_pfns);
|
|
#endif /* !CONFIG_VIRTUAL_MEM_MAP */
|
|
zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
|
|
}
|