[deliverable/linux.git] / arch / ia64 / mm / contig.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/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 "Free swap:       %6ldkB\n",
	       nr_swap_pages<<(PAGE_SHIFT-10));
	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 (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;
}

/**
 * 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);

	find_initrd();

}

#ifdef CONFIG_SMP
/**
 * per_cpu_init - setup per-cpu variables
 *
 * Allocate and setup per-cpu data areas.
 */
void * __cpuinit
per_cpu_init (void)
{
	void *cpu_data;
	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) {
		first_time=0;
		cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
					   PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
		for (cpu = 0; 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()];
}
#endif /* CONFIG_SMP */

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(register_active_ranges, NULL);
	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));
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1998-2003 Hewlett-Packard Co
	7	* David Mosberger-Tang <davidm@hpl.hp.com>
	8	* Stephane Eranian <eranian@hpl.hp.com>
	9	* Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
	10	* Copyright (C) 1999 VA Linux Systems
	11	* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	12	* Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
	13	*
	14	* Routines used by ia64 machines with contiguous (or virtually contiguous)
	15	* memory.
	16	*/
1da177e4 LT	17	#include <linux/bootmem.h>
	18	#include <linux/efi.h>
	19	#include <linux/mm.h>
	20	#include <linux/swap.h>
	21
	22	#include <asm/meminit.h>
	23	#include <asm/pgalloc.h>
	24	#include <asm/pgtable.h>
	25	#include <asm/sections.h>
	26	#include <asm/mca.h>
	27
	28	#ifdef CONFIG_VIRTUAL_MEM_MAP
e44e41d0	29	static unsigned long max_gap;
1da177e4 LT	30	#endif
	31
	32	/**
f1c0afa2	33	* show_mem - give short summary of memory stats
1da177e4	34	*
f1c0afa2 GB	35	* Shows a simple page count of reserved and used pages in the system.
f1c0afa2 GB	36	* For discontig machines, it does this on a per-pgdat basis.
1da177e4	37	*/
f1c0afa2	38	void show_mem(void)
1da177e4	39	{
f1c0afa2 GB	40	int i, total_reserved = 0;
	41	int total_shared = 0, total_cached = 0;
	42	unsigned long total_present = 0;
	43	pg_data_t *pgdat;
1da177e4	44
709a6c1c	45	printk(KERN_INFO "Mem-info:\n");
1da177e4	46	show_free_areas();
709a6c1c JS	47	printk(KERN_INFO "Free swap: %6ldkB\n",
709a6c1c JS	48	nr_swap_pages<<(PAGE_SHIFT-10));
f1c0afa2 GB	49	printk(KERN_INFO "Node memory in pages:\n");
	50	for_each_online_pgdat(pgdat) {
	51	unsigned long present;
	52	unsigned long flags;
	53	int shared = 0, cached = 0, reserved = 0;
	54
	55	pgdat_resize_lock(pgdat, &flags);
	56	present = pgdat->node_present_pages;
	57	for(i = 0; i < pgdat->node_spanned_pages; i++) {
	58	struct page *page;
	59	if (pfn_valid(pgdat->node_start_pfn + i))
	60	page = pfn_to_page(pgdat->node_start_pfn + i);
	61	else {
e44e41d0	62	#ifdef CONFIG_VIRTUAL_MEM_MAP
f1c0afa2 GB	63	if (max_gap < LARGE_GAP)
f1c0afa2 GB	64	continue;
e44e41d0	65	#endif
f1c0afa2 GB	66	i = vmemmap_find_next_valid_pfn(pgdat->node_id,
	67	i) - 1;
	68	continue;
	69	}
	70	if (PageReserved(page))
	71	reserved++;
	72	else if (PageSwapCache(page))
	73	cached++;
	74	else if (page_count(page))
	75	shared += page_count(page)-1;
e44e41d0	76	}
f1c0afa2 GB	77	pgdat_resize_unlock(pgdat, &flags);
	78	total_present += present;
	79	total_reserved += reserved;
	80	total_cached += cached;
	81	total_shared += shared;
	82	printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
	83	"shrd: %10d, swpd: %10d\n", pgdat->node_id,
	84	present, reserved, shared, cached);
1da177e4	85	}
f1c0afa2 GB	86	printk(KERN_INFO "%ld pages of RAM\n", total_present);
	87	printk(KERN_INFO "%d reserved pages\n", total_reserved);
	88	printk(KERN_INFO "%d pages shared\n", total_shared);
	89	printk(KERN_INFO "%d pages swap cached\n", total_cached);
	90	printk(KERN_INFO "Total of %ld pages in page table cache\n",
2bd62a40	91	quicklist_total_size());
f1c0afa2	92	printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
1da177e4 LT	93	}
1da177e4 LT	94
f1c0afa2	95
1da177e4 LT	96	/* physical address where the bootmem map is located */
	97	unsigned long bootmap_start;
	98
1da177e4 LT	99	/**
	100	* find_bootmap_location - callback to find a memory area for the bootmap
	101	* @start: start of region
	102	* @end: end of region
	103	* @arg: unused callback data
	104	*
	105	* Find a place to put the bootmap and return its starting address in
	106	* bootmap_start. This address must be page-aligned.
	107	*/
dae28066	108	static int __init
1da177e4 LT	109	find_bootmap_location (unsigned long start, unsigned long end, void *arg)
	110	{
	111	unsigned long needed = (unsigned long )arg;
	112	unsigned long range_start, range_end, free_start;
	113	int i;
	114
	115	#if IGNORE_PFN0
	116	if (start == PAGE_OFFSET) {
	117	start += PAGE_SIZE;
	118	if (start >= end)
	119	return 0;
	120	}
	121	#endif
	122
	123	free_start = PAGE_OFFSET;
	124
	125	for (i = 0; i < num_rsvd_regions; i++) {
	126	range_start = max(start, free_start);
	127	range_end = min(end, rsvd_region[i].start & PAGE_MASK);
	128
	129	free_start = PAGE_ALIGN(rsvd_region[i].end);
	130
	131	if (range_end <= range_start)
	132	continue; /* skip over empty range */
	133
	134	if (range_end - range_start >= needed) {
	135	bootmap_start = __pa(range_start);
	136	return -1; /* done */
	137	}
	138
	139	/* nothing more available in this segment */
	140	if (range_end == end)
	141	return 0;
	142	}
	143	return 0;
	144	}
	145
	146	/**
	147	* find_memory - setup memory map
	148	*
	149	* Walk the EFI memory map and find usable memory for the system, taking
	150	* into account reserved areas.
	151	*/
dae28066	152	void __init
1da177e4 LT	153	find_memory (void)
	154	{
	155	unsigned long bootmap_size;
	156
	157	reserve_memory();
	158
	159	/* first find highest page frame number */
a3f5c338 ZN	160	min_low_pfn = ~0UL;
	161	max_low_pfn = 0;
	162	efi_memmap_walk(find_max_min_low_pfn, NULL);
	163	max_pfn = max_low_pfn;
1da177e4 LT	164	/* how many bytes to cover all the pages */
	165	bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
	166
	167	/* look for a location to hold the bootmap */
	168	bootmap_start = ~0UL;
	169	efi_memmap_walk(find_bootmap_location, &bootmap_size);
	170	if (bootmap_start == ~0UL)
	171	panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
	172
a3f5c338 ZN	173	bootmap_size = init_bootmem_node(NODE_DATA(0),
a3f5c338 ZN	174	(bootmap_start >> PAGE_SHIFT), 0, max_pfn);
1da177e4 LT	175
	176	/* Free all available memory, then mark bootmem-map as being in use. */
	177	efi_memmap_walk(filter_rsvd_memory, free_bootmem);
	178	reserve_bootmem(bootmap_start, bootmap_size);
	179
	180	find_initrd();
45a98fc6	181
1da177e4 LT	182	}
	183
	184	#ifdef CONFIG_SMP
	185	/**
	186	* per_cpu_init - setup per-cpu variables
	187	*
	188	* Allocate and setup per-cpu data areas.
	189	*/
244fd545	190	void * __cpuinit
1da177e4 LT	191	per_cpu_init (void)
	192	{
	193	void *cpu_data;
	194	int cpu;
ff741906	195	static int first_time=1;
1da177e4 LT	196
	197	/*
	198	* get_free_pages() cannot be used before cpu_init() done. BSP
	199	* allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
	200	* get_zeroed_page().
	201	*/
ff741906 AR	202	if (first_time) {
ff741906 AR	203	first_time=0;
1da177e4 LT	204	cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
	205	PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
	206	for (cpu = 0; cpu < NR_CPUS; cpu++) {
	207	memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
	208	__per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
	209	cpu_data += PERCPU_PAGE_SIZE;
	210	per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
	211	}
	212	}
	213	return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
	214	}
	215	#endif /* CONFIG_SMP */
	216
	217	static int
	218	count_pages (u64 start, u64 end, void *arg)
	219	{
	220	unsigned long *count = arg;
	221
	222	*count += (end - start) >> PAGE_SHIFT;
	223	return 0;
	224	}
	225
1da177e4 LT	226	/*
	227	* Set up the page tables.
	228	*/
	229
dae28066	230	void __init
1da177e4 LT	231	paging_init (void)
	232	{
	233	unsigned long max_dma;
05e0caad	234	unsigned long max_zone_pfns[MAX_NR_ZONES];
1da177e4 LT	235
	236	num_physpages = 0;
	237	efi_memmap_walk(count_pages, &num_physpages);
	238
6391af17	239	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
09ae1f58 CL	240	#ifdef CONFIG_ZONE_DMA
09ae1f58 CL	241	max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
05e0caad	242	max_zone_pfns[ZONE_DMA] = max_dma;
09ae1f58	243	#endif
05e0caad	244	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
1da177e4 LT	245
1da177e4 LT	246	#ifdef CONFIG_VIRTUAL_MEM_MAP
8b9c1068	247	efi_memmap_walk(register_active_ranges, NULL);
1da177e4 LT	248	efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
	249	if (max_gap < LARGE_GAP) {
	250	vmem_map = (struct page *) 0;
05e0caad	251	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	252	} else {
	253	unsigned long map_size;
	254
	255	/* allocate virtual_mem_map */
	256
921eea1c BP	257	map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
921eea1c BP	258	sizeof(struct page));
1da177e4 LT	259	vmalloc_end -= map_size;
	260	vmem_map = (struct page *) vmalloc_end;
	261	efi_memmap_walk(create_mem_map_page_table, NULL);
	262
05e0caad MG	263	/*
	264	* alloc_node_mem_map makes an adjustment for mem_map
	265	* which isn't compatible with vmem_map.
	266	*/
	267	NODE_DATA(0)->node_mem_map = vmem_map +
	268	find_min_pfn_with_active_regions();
	269	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	270
	271	printk("Virtual mem_map starts at 0x%p\n", mem_map);
	272	}
	273	#else /* !CONFIG_VIRTUAL_MEM_MAP */
05e0caad MG	274	add_active_range(0, 0, max_low_pfn);
05e0caad MG	275	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	276	#endif /* !CONFIG_VIRTUAL_MEM_MAP */
	277	zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
	278	}