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sh: bootmem tidying for discontig/sparsemem preparation. 

This reworks some of the node 0 bootmem initialization in
preparation for discontigmem and sparsemem support.

ARCH_POPULATES_NODE_MAP is switched to as a result of this.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2007-03-28 16:38:13 +09:00 committed by Paul Mundt
parent 759ab068c4
commit 01066625e9
5 changed files with 229 additions and 203 deletions
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208
arch/sh/kernel/setup.c
View File

@ -4,7 +4,7 @@
* This file handles the architecture-dependent parts of initialization
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002 - 2006 Paul Mundt
* Copyright (C) 2002 - 2007 Paul Mundt
*/
#include <linux/screen_info.h>
#include <linux/ioport.h>
@ -15,15 +15,18 @@
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/utsname.h>
#include <linux/nodemask.h>
#include <linux/cpu.h>
#include <linux/pfn.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/clock.h>
#include <asm/mmu_context.h>
extern void * __rd_start, * __rd_end;
@ -202,13 +205,112 @@ static int __init sh_mv_setup(char **cmdline_p)
return 0;
}
void __init setup_arch(char **cmdline_p)
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
static void __init register_bootmem_low_pages(void)
{
unsigned long curr_pfn, last_pfn, pages;
/*
* We are rounding up the start address of usable memory:
*/
curr_pfn = PFN_UP(__MEMORY_START);
/*
* ... and at the end of the usable range downwards:
*/
last_pfn = PFN_DOWN(__pa(memory_end));
if (last_pfn > max_low_pfn)
last_pfn = max_low_pfn;
pages = last_pfn - curr_pfn;
free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(pages));
}
void __init setup_bootmem_allocator(unsigned long start_pfn)
{
unsigned long bootmap_size;
unsigned long start_pfn, max_pfn, max_low_pfn;
/*
* Find a proper area for the bootmem bitmap. After this
* bootstrap step all allocations (until the page allocator
* is intact) must be done via bootmem_alloc().
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
min_low_pfn, max_low_pfn);
register_bootmem_low_pages();
node_set_online(0);
/*
* Reserve the kernel text and
* Reserve the bootmem bitmap. We do this in two steps (first step
* was init_bootmem()), because this catches the (definitely buggy)
* case of us accidentally initializing the bootmem allocator with
* an invalid RAM area.
*/
reserve_bootmem(__MEMORY_START+PAGE_SIZE,
(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem(__MEMORY_START, PAGE_SIZE);
#ifdef CONFIG_BLK_DEV_INITRD
ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
if (&__rd_start != &__rd_end) {
LOADER_TYPE = 1;
INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
__MEMORY_START;
INITRD_SIZE = (unsigned long)&__rd_end -
(unsigned long)&__rd_start;
}
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
reserve_bootmem(INITRD_START + __MEMORY_START,
INITRD_SIZE);
initrd_start = INITRD_START + PAGE_OFFSET +
__MEMORY_START;
initrd_end = initrd_start + INITRD_SIZE;
} else {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
INITRD_START + INITRD_SIZE,
max_low_pfn << PAGE_SHIFT);
initrd_start = 0;
}
}
#endif
}
#ifndef CONFIG_NEED_MULTIPLE_NODES
static void __init setup_memory(void)
{
unsigned long start_pfn;
/*
* Partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(_end));
setup_bootmem_allocator(start_pfn);
}
#else
extern void __init setup_memory(void);
#endif
void __init setup_arch(char **cmdline_p)
{
enable_mmu();
#ifdef CONFIG_CMDLINE_BOOL
strcpy(COMMAND_LINE, CONFIG_CMDLINE);
strcpy(COMMAND_LINE, CONFIG_CMDLINE);
#endif
ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
@ -226,14 +328,15 @@ void __init setup_arch(char **cmdline_p)
init_mm.end_data = (unsigned long) _edata;
init_mm.brk = (unsigned long) _end;
code_resource.start = (unsigned long)virt_to_phys(_text);
code_resource.end = (unsigned long)virt_to_phys(_etext)-1;
data_resource.start = (unsigned long)virt_to_phys(_etext);
data_resource.end = (unsigned long)virt_to_phys(_edata)-1;
code_resource.start = virt_to_phys(_text);
code_resource.end = virt_to_phys(_etext)-1;
data_resource.start = virt_to_phys(_etext);
data_resource.end = virt_to_phys(_edata)-1;
parse_early_param();
sh_mv_setup(cmdline_p);
/*
* Find the highest page frame number we have available
*/
@ -243,87 +346,12 @@ void __init setup_arch(char **cmdline_p)
* Determine low and high memory ranges:
*/
max_low_pfn = max_pfn;
min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
/*
* Partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(_end));
/*
* Find a proper area for the bootmem bitmap. After this
* bootstrap step all allocations (until the page allocator
* is intact) must be done via bootmem_alloc().
*/
bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
__MEMORY_START>>PAGE_SHIFT,
max_low_pfn);
/*
* Register fully available low RAM pages with the bootmem allocator.
*/
{
unsigned long curr_pfn, last_pfn, pages;
/*
* We are rounding up the start address of usable memory:
*/
curr_pfn = PFN_UP(__MEMORY_START);
/*
* ... and at the end of the usable range downwards:
*/
last_pfn = PFN_DOWN(__pa(memory_end));
if (last_pfn > max_low_pfn)
last_pfn = max_low_pfn;
pages = last_pfn - curr_pfn;
free_bootmem_node(NODE_DATA(0), PFN_PHYS(curr_pfn),
PFN_PHYS(pages));
}
/*
* Reserve the kernel text and
* Reserve the bootmem bitmap. We do this in two steps (first step
* was init_bootmem()), because this catches the (definitely buggy)
* case of us accidentally initializing the bootmem allocator with
* an invalid RAM area.
*/
reserve_bootmem_node(NODE_DATA(0), __MEMORY_START+PAGE_SIZE,
(PFN_PHYS(start_pfn)+bootmap_size+PAGE_SIZE-1)-__MEMORY_START);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem_node(NODE_DATA(0), __MEMORY_START, PAGE_SIZE);
#ifdef CONFIG_BLK_DEV_INITRD
ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
if (&__rd_start != &__rd_end) {
LOADER_TYPE = 1;
INITRD_START = PHYSADDR((unsigned long)&__rd_start) -
__MEMORY_START;
INITRD_SIZE = (unsigned long)&__rd_end -
(unsigned long)&__rd_start;
}
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
reserve_bootmem_node(NODE_DATA(0), INITRD_START +
__MEMORY_START, INITRD_SIZE);
initrd_start = INITRD_START + PAGE_OFFSET +
__MEMORY_START;
initrd_end = initrd_start + INITRD_SIZE;
} else {
printk("initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
INITRD_START + INITRD_SIZE,
max_low_pfn << PAGE_SHIFT);
initrd_start = 0;
}
}
#endif
nodes_clear(node_online_map);
setup_memory();
paging_init();
sparse_init();
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
@ -332,8 +360,6 @@ void __init setup_arch(char **cmdline_p)
/* Perform the machine specific initialisation */
if (likely(sh_mv.mv_setup))
sh_mv.mv_setup(cmdline_p);
paging_init();
}
struct sh_machine_vector* __init get_mv_byname(const char* name)

11
arch/sh/mm/Kconfig
View File

@ -291,6 +291,17 @@ config VSYSCALL
For systems with an MMU that can afford to give up a page,
(the default value) say Y.
config NODES_SHIFT
int
default "1"
depends on NEED_MULTIPLE_NODES
config ARCH_FLATMEM_ENABLE
def_bool y
config ARCH_POPULATES_NODE_MAP
def_bool y
choice
prompt "Kernel page size"
default PAGE_SIZE_4KB

197
arch/sh/mm/init.c
View File

@ -1,37 +1,20 @@
/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
*
* linux/arch/sh/mm/init.c
/*
* linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002, 2004 Paul Mundt
* Copyright (C) 2002 - 2007 Paul Mundt
*
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
#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/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <linux/percpu.h>
#include <linux/io.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/cache.h>
@ -39,37 +22,51 @@
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
#ifdef CONFIG_MMU
/* It'd be good if these lines were in the standard header file. */
#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
#endif
void (*copy_page)(void *from, void *to);
void (*clear_page)(void *to);
void show_mem(void)
{
int i, total = 0, reserved = 0;
int shared = 0, cached = 0;
int total = 0, reserved = 0, free = 0;
int shared = 0, cached = 0, slab = 0;
pg_data_t *pgdat;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
i = max_mapnr;
while (i-- > 0) {
total++;
if (PageReserved(mem_map+i))
reserved++;
else if (PageSwapCache(mem_map+i))
cached++;
else if (page_count(mem_map+i))
shared += page_count(mem_map+i) - 1;
for_each_online_pgdat(pgdat) {
struct page *page, *end;
unsigned long flags;
pgdat_resize_lock(pgdat, &flags);
page = pgdat->node_mem_map;
end = page + pgdat->node_spanned_pages;
do {
total++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (PageSlab(page))
slab++;
else if (!page_count(page))
free++;
else
shared += page_count(page) - 1;
page++;
} while (page < end);
pgdat_resize_unlock(pgdat, &flags);
}
printk("%d pages of RAM\n",total);
printk("%d reserved pages\n",reserved);
printk("%d pages shared\n",shared);
printk("%d pages swap cached\n",cached);
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
printk("%d pages of RAM\n", total);
printk("%d free pages\n", free);
printk("%d reserved pages\n", reserved);
printk("%d slab pages\n", slab);
printk("%d pages shared\n", shared);
printk("%d pages swap cached\n", cached);
}
#ifdef CONFIG_MMU
@ -147,52 +144,38 @@ extern char __init_begin, __init_end;
*/
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
int nid;
/*
* Setup some defaults for the zone sizes.. these should be safe
* regardless of distcontiguous memory or MMU settings.
*/
zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
#endif
#ifdef CONFIG_MMU
/*
* If we have an MMU, and want to be using it .. we need to adjust
* the zone sizes accordingly, in addition to turning it on.
*/
{
/* We don't need to map the kernel through the TLB, as
* it is permanatly mapped using P1. So clear the
* entire pgd. */
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
/* Turn on the MMU */
enable_mmu();
zones_size[ZONE_NORMAL] = MAX_LOW_PFN - START_PFN;
}
/* We don't need to map the kernel through the TLB, as
* it is permanatly mapped using P1. So clear the
* entire pgd. */
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
/* Set an initial value for the MMU.TTB so we don't have to
* check for a null value. */
set_TTB(swapper_pg_dir);
#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
/*
* If we don't have CONFIG_MMU set and the processor in question
* still has an MMU, care needs to be taken to make sure it doesn't
* stay on.. Since the boot loader could have potentially already
* turned it on, and we clearly don't want it, we simply turn it off.
*
* We don't need to do anything special for the zone sizes, since the
* default values that were already configured up above should be
* satisfactory.
*/
disable_mmu();
#endif
NODE_DATA(0)->node_mem_map = NULL;
free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long max_zone_pfns[MAX_NR_ZONES];
unsigned long low, start_pfn;
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
low = pgdat->bdata->node_low_pfn;
max_zone_pfns[ZONE_NORMAL] = low;
add_active_range(nid, start_pfn, low);
printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
nid, start_pfn, low);
free_area_init_nodes(max_zone_pfns);
printk("Node %u: mem_map starts at %p\n",
pgdat->node_id, pgdat->node_mem_map);
}
}
static struct kcore_list kcore_mem, kcore_vmalloc;
@ -200,18 +183,33 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
void __init mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
int tmp;
extern unsigned long memory_start;
int nid;
#ifdef CONFIG_MMU
high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
#else
extern unsigned long memory_end;
reservedpages = 0;
high_memory = (void *)(memory_end & PAGE_MASK);
#endif
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long node_pages = 0;
void *node_high_memory;
int i;
max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);
num_physpages += pgdat->node_present_pages;
if (pgdat->node_spanned_pages)
node_pages = free_all_bootmem_node(pgdat);
totalram_pages += node_pages;
for (i = 0; i < node_pages; i++)
if (PageReserved(pgdat->node_mem_map + i))
reservedpages++;
node_high_memory = (void *)((pgdat->node_start_pfn +
pgdat->node_spanned_pages) <<
PAGE_SHIFT);
if (node_high_memory > high_memory)
high_memory = node_high_memory;
}
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
@ -229,16 +227,6 @@ void __init mem_init(void)
clear_page = clear_page_nommu;
#endif
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem_node(NODE_DATA(0));
reservedpages = 0;
for (tmp = 0; tmp < num_physpages; tmp++)
/*
* Only count reserved RAM pages
*/
if (PageReserved(mem_map+tmp))
reservedpages++;
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
@ -250,7 +238,7 @@ void __init mem_init(void)
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk reserved, %dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
max_mapnr << (PAGE_SHIFT-10),
totalram_pages << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
@ -289,4 +277,3 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif

6
include/asm-sh/mmu_context.h
View File

@ -169,6 +169,8 @@ enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
#define destroy_context(mm) do { } while (0)
#define set_asid(asid) do { } while (0)
#define get_asid() (0)
#define set_TTB(pgd) do { } while (0)
#define get_TTB() (0)
#define activate_context(mm,cpu) do { } while (0)
#define switch_mm(prev,next,tsk) do { } while (0)
#define deactivate_mm(tsk,mm) do { } while (0)
@ -211,8 +213,8 @@ static inline void disable_mmu(void)
* MMU control handlers for processors lacking memory
* management hardware.
*/
#define enable_mmu() do { BUG(); } while (0)
#define disable_mmu() do { BUG(); } while (0)
#define enable_mmu() do { } while (0)
#define disable_mmu() do { } while (0)
#endif
#endif /* __KERNEL__ */

10
include/asm-sh/page.h
View File

@ -59,6 +59,7 @@ extern void (*clear_page)(void *to);
extern void (*copy_page)(void *to, void *from);
extern unsigned long shm_align_mask;
extern unsigned long max_low_pfn, min_low_pfn;
#ifdef CONFIG_MMU
extern void clear_page_slow(void *to);
@ -124,17 +125,16 @@ typedef struct { unsigned long pgd; } pgd_t;
#define PAGE_OFFSET CONFIG_PAGE_OFFSET
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
#define MAP_NR(addr) (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT)
#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
/* PFN start number, because of __MEMORY_START */
#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
#define ARCH_PFN_OFFSET (PFN_START)
#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_valid(pfn) (((pfn) - PFN_START) < max_mapnr)
#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \