[linux-2.6-block.git] / arch / arm64 / mm / init.c

/*
 * Based on arch/arm/mm/init.c
 *
 * Copyright (C) 1995-2005 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/errno.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mman.h>
#include <linux/nodemask.h>
#include <linux/initrd.h>
#include <linux/gfp.h>
#include <linux/memblock.h>
#include <linux/sort.h>
#include <linux/of_fdt.h>
#include <linux/dma-mapping.h>
#include <linux/dma-contiguous.h>

#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sizes.h>
#include <asm/tlb.h>

#include "mm.h"

phys_addr_t memstart_addr __read_mostly = 0;

#ifdef CONFIG_BLK_DEV_INITRD
static int __init early_initrd(char *p)
{
	unsigned long start, size;
	char *endp;

	start = memparse(p, &endp);
	if (*endp == ',') {
		size = memparse(endp + 1, NULL);

		initrd_start = (unsigned long)__va(start);
		initrd_end = (unsigned long)__va(start + size);
	}
	return 0;
}
early_param("initrd", early_initrd);
#endif

static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
	struct memblock_region *reg;
	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
	unsigned long max_dma = min;

	memset(zone_size, 0, sizeof(zone_size));

	/* 4GB maximum for 32-bit only capable devices */
	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
		unsigned long max_dma_phys =
			(unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1);
		max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
		zone_size[ZONE_DMA] = max_dma - min;
	}
	zone_size[ZONE_NORMAL] = max - max_dma;

	memcpy(zhole_size, zone_size, sizeof(zhole_size));

	for_each_memblock(memory, reg) {
		unsigned long start = memblock_region_memory_base_pfn(reg);
		unsigned long end = memblock_region_memory_end_pfn(reg);

		if (start >= max)
			continue;

		if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
			unsigned long dma_end = min(end, max_dma);
			zhole_size[ZONE_DMA] -= dma_end - start;
		}

		if (end > max_dma) {
			unsigned long normal_end = min(end, max);
			unsigned long normal_start = max(start, max_dma);
			zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
		}
	}

	free_area_init_node(0, zone_size, min, zhole_size);
}

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
int pfn_valid(unsigned long pfn)
{
	return memblock_is_memory(pfn << PAGE_SHIFT);
}
EXPORT_SYMBOL(pfn_valid);
#endif

#ifndef CONFIG_SPARSEMEM
static void arm64_memory_present(void)
{
}
#else
static void arm64_memory_present(void)
{
	struct memblock_region *reg;

	for_each_memblock(memory, reg)
		memory_present(0, memblock_region_memory_base_pfn(reg),
			       memblock_region_memory_end_pfn(reg));
}
#endif

void __init arm64_memblock_init(void)
{
	phys_addr_t dma_phys_limit = 0;

	/*
	 * Register the kernel text, kernel data, initrd, and initial
	 * pagetables with memblock.
	 */
	memblock_reserve(__pa(_text), _end - _text);
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
#endif

	early_init_fdt_scan_reserved_mem();

	/* 4GB maximum for 32-bit only capable devices */
	if (IS_ENABLED(CONFIG_ZONE_DMA))
		dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1;
	dma_contiguous_reserve(dma_phys_limit);

	memblock_allow_resize();
	memblock_dump_all();
}

void __init bootmem_init(void)
{
	unsigned long min, max;

	min = PFN_UP(memblock_start_of_DRAM());
	max = PFN_DOWN(memblock_end_of_DRAM());

	/*
	 * Sparsemem tries to allocate bootmem in memory_present(), so must be
	 * done after the fixed reservations.
	 */
	arm64_memory_present();

	sparse_init();
	zone_sizes_init(min, max);

	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	max_pfn = max_low_pfn = max;
}

#ifndef CONFIG_SPARSEMEM_VMEMMAP
static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
{
	struct page *start_pg, *end_pg;
	unsigned long pg, pgend;

	/*
	 * Convert start_pfn/end_pfn to a struct page pointer.
	 */
	start_pg = pfn_to_page(start_pfn - 1) + 1;
	end_pg = pfn_to_page(end_pfn - 1) + 1;

	/*
	 * Convert to physical addresses, and round start upwards and end
	 * downwards.
	 */
	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;

	/*
	 * If there are free pages between these, free the section of the
	 * memmap array.
	 */
	if (pg < pgend)
		free_bootmem(pg, pgend - pg);
}

/*
 * The mem_map array can get very big. Free the unused area of the memory map.
 */
static void __init free_unused_memmap(void)
{
	unsigned long start, prev_end = 0;
	struct memblock_region *reg;

	for_each_memblock(memory, reg) {
		start = __phys_to_pfn(reg->base);

#ifdef CONFIG_SPARSEMEM
		/*
		 * Take care not to free memmap entries that don't exist due
		 * to SPARSEMEM sections which aren't present.
		 */
		start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
		/*
		 * If we had a previous bank, and there is a space between the
		 * current bank and the previous, free it.
		 */
		if (prev_end && prev_end < start)
			free_memmap(prev_end, start);

		/*
		 * Align up here since the VM subsystem insists that the
		 * memmap entries are valid from the bank end aligned to
		 * MAX_ORDER_NR_PAGES.
		 */
		prev_end = ALIGN(start + __phys_to_pfn(reg->size),
				 MAX_ORDER_NR_PAGES);
	}

#ifdef CONFIG_SPARSEMEM
	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
		free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
#endif
}
#endif	/* !CONFIG_SPARSEMEM_VMEMMAP */

/*
 * mem_init() marks the free areas in the mem_map and tells us how much memory
 * is free.  This is done after various parts of the system have claimed their
 * memory after the kernel image.
 */
void __init mem_init(void)
{
	max_mapnr   = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;

#ifndef CONFIG_SPARSEMEM_VMEMMAP
	free_unused_memmap();
#endif
	/* this will put all unused low memory onto the freelists */
	free_all_bootmem();

	mem_init_print_info(NULL);

#define MLK(b, t) b, t, ((t) - (b)) >> 10
#define MLM(b, t) b, t, ((t) - (b)) >> 20
#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)

	pr_notice("Virtual kernel memory layout:\n"
		  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld MB)\n"
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld MB)\n"
#endif
		  "    modules : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "    memory  : 0x%16lx - 0x%16lx   (%6ld MB)\n"
		  "      .init : 0x%p" " - 0x%p" "   (%6ld kB)\n"
		  "      .text : 0x%p" " - 0x%p" "   (%6ld kB)\n"
		  "      .data : 0x%p" " - 0x%p" "   (%6ld kB)\n",
		  MLM(VMALLOC_START, VMALLOC_END),
#ifdef CONFIG_SPARSEMEM_VMEMMAP
		  MLM((unsigned long)virt_to_page(PAGE_OFFSET),
		      (unsigned long)virt_to_page(high_memory)),
#endif
		  MLM(MODULES_VADDR, MODULES_END),
		  MLM(PAGE_OFFSET, (unsigned long)high_memory),

		  MLK_ROUNDUP(__init_begin, __init_end),
		  MLK_ROUNDUP(_text, _etext),
		  MLK_ROUNDUP(_sdata, _edata));

#undef MLK
#undef MLM
#undef MLK_ROUNDUP

	/*
	 * Check boundaries twice: Some fundamental inconsistencies can be
	 * detected at build time already.
	 */
#ifdef CONFIG_COMPAT
	BUILD_BUG_ON(TASK_SIZE_32			> TASK_SIZE_64);
#endif
	BUILD_BUG_ON(TASK_SIZE_64			> MODULES_VADDR);
	BUG_ON(TASK_SIZE_64				> MODULES_VADDR);

	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
		extern int sysctl_overcommit_memory;
		/*
		 * On a machine this small we won't get anywhere without
		 * overcommit, so turn it on by default.
		 */
		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	}
}

void free_initmem(void)
{
	free_initmem_default(0);
}

#ifdef CONFIG_BLK_DEV_INITRD

static int keep_initrd;

void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (!keep_initrd)
		free_reserved_area((void *)start, (void *)end, 0, "initrd");
}

static int __init keepinitrd_setup(char *__unused)
{
	keep_initrd = 1;
	return 1;
}

__setup("keepinitrd", keepinitrd_setup);
#endif
Commit	Line	Data
c1cc1552 CM	1	/*
	2	* Based on arch/arm/mm/init.c
	3	*
	4	* Copyright (C) 1995-2005 Russell King
	5	* Copyright (C) 2012 ARM Ltd.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	18	*/
	19
	20	#include <linux/kernel.h>
	21	#include <linux/export.h>
	22	#include <linux/errno.h>
	23	#include <linux/swap.h>
	24	#include <linux/init.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/mman.h>
	27	#include <linux/nodemask.h>
	28	#include <linux/initrd.h>
	29	#include <linux/gfp.h>
	30	#include <linux/memblock.h>
	31	#include <linux/sort.h>
	32	#include <linux/of_fdt.h>
19e7640d	33	#include <linux/dma-mapping.h>
6ac2104d	34	#include <linux/dma-contiguous.h>
c1cc1552	35
c1cc1552 CM	36	#include <asm/sections.h>
	37	#include <asm/setup.h>
	38	#include <asm/sizes.h>
	39	#include <asm/tlb.h>
	40
	41	#include "mm.h"
	42
c1cc1552 CM	43	phys_addr_t memstart_addr __read_mostly = 0;
c1cc1552 CM	44
ec2eaa73	45	#ifdef CONFIG_BLK_DEV_INITRD
c1cc1552 CM	46	static int __init early_initrd(char *p)
	47	{
	48	unsigned long start, size;
	49	char *endp;
	50
	51	start = memparse(p, &endp);
	52	if (*endp == ',') {
	53	size = memparse(endp + 1, NULL);
	54
ec2eaa73 RH	55	initrd_start = (unsigned long)__va(start);
ec2eaa73 RH	56	initrd_end = (unsigned long)__va(start + size);
c1cc1552 CM	57	}
	58	return 0;
	59	}
	60	early_param("initrd", early_initrd);
ec2eaa73	61	#endif
c1cc1552	62
c1cc1552 CM	63	static void __init zone_sizes_init(unsigned long min, unsigned long max)
	64	{
	65	struct memblock_region *reg;
	66	unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
19e7640d	67	unsigned long max_dma = min;
c1cc1552 CM	68
	69	memset(zone_size, 0, sizeof(zone_size));
	70
c1cc1552	71	/* 4GB maximum for 32-bit only capable devices */
19e7640d CM	72	if (IS_ENABLED(CONFIG_ZONE_DMA)) {
19e7640d CM	73	unsigned long max_dma_phys =
2d5a5612	74	(unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1);
19e7640d CM	75	max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
	76	zone_size[ZONE_DMA] = max_dma - min;
	77	}
	78	zone_size[ZONE_NORMAL] = max - max_dma;
c1cc1552 CM	79
	80	memcpy(zhole_size, zone_size, sizeof(zhole_size));
	81
	82	for_each_memblock(memory, reg) {
	83	unsigned long start = memblock_region_memory_base_pfn(reg);
	84	unsigned long end = memblock_region_memory_end_pfn(reg);
	85
	86	if (start >= max)
	87	continue;
19e7640d CM	88
	89	if (IS_ENABLED(CONFIG_ZONE_DMA) && start < max_dma) {
	90	unsigned long dma_end = min(end, max_dma);
	91	zhole_size[ZONE_DMA] -= dma_end - start;
c1cc1552	92	}
19e7640d CM	93
19e7640d CM	94	if (end > max_dma) {
c1cc1552	95	unsigned long normal_end = min(end, max);
19e7640d	96	unsigned long normal_start = max(start, max_dma);
c1cc1552 CM	97	zhole_size[ZONE_NORMAL] -= normal_end - normal_start;
	98	}
	99	}
	100
	101	free_area_init_node(0, zone_size, min, zhole_size);
	102	}
	103
	104	#ifdef CONFIG_HAVE_ARCH_PFN_VALID
	105	int pfn_valid(unsigned long pfn)
	106	{
	107	return memblock_is_memory(pfn << PAGE_SHIFT);
	108	}
	109	EXPORT_SYMBOL(pfn_valid);
	110	#endif
	111
	112	#ifndef CONFIG_SPARSEMEM
	113	static void arm64_memory_present(void)
	114	{
	115	}
	116	#else
	117	static void arm64_memory_present(void)
	118	{
	119	struct memblock_region *reg;
	120
	121	for_each_memblock(memory, reg)
	122	memory_present(0, memblock_region_memory_base_pfn(reg),
	123	memblock_region_memory_end_pfn(reg));
	124	}
	125	#endif
	126
	127	void __init arm64_memblock_init(void)
	128	{
2d5a5612 CM	129	phys_addr_t dma_phys_limit = 0;
2d5a5612 CM	130
bd00cd5f MR	131	/*
	132	* Register the kernel text, kernel data, initrd, and initial
	133	* pagetables with memblock.
	134	*/
c1cc1552 CM	135	memblock_reserve(__pa(_text), _end - _text);
c1cc1552 CM	136	#ifdef CONFIG_BLK_DEV_INITRD
ec2eaa73 RH	137	if (initrd_start)
ec2eaa73 RH	138	memblock_reserve(__virt_to_phys(initrd_start), initrd_end - initrd_start);
c1cc1552 CM	139	#endif
c1cc1552 CM	140
9bf14b7c	141	early_init_fdt_scan_reserved_mem();
2d5a5612 CM	142
	143	/* 4GB maximum for 32-bit only capable devices */
	144	if (IS_ENABLED(CONFIG_ZONE_DMA))
	145	dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1;
	146	dma_contiguous_reserve(dma_phys_limit);
6ac2104d	147
c1cc1552 CM	148	memblock_allow_resize();
	149	memblock_dump_all();
	150	}
	151
	152	void __init bootmem_init(void)
	153	{
	154	unsigned long min, max;
	155
	156	min = PFN_UP(memblock_start_of_DRAM());
	157	max = PFN_DOWN(memblock_end_of_DRAM());
	158
	159	/*
	160	* Sparsemem tries to allocate bootmem in memory_present(), so must be
	161	* done after the fixed reservations.
	162	*/
	163	arm64_memory_present();
	164
	165	sparse_init();
	166	zone_sizes_init(min, max);
	167
	168	high_memory = __va((max << PAGE_SHIFT) - 1) + 1;
	169	max_pfn = max_low_pfn = max;
	170	}
	171
c1cc1552 CM	172	#ifndef CONFIG_SPARSEMEM_VMEMMAP
	173	static inline void free_memmap(unsigned long start_pfn, unsigned long end_pfn)
	174	{
	175	struct page start_pg, end_pg;
	176	unsigned long pg, pgend;
	177
	178	/*
	179	* Convert start_pfn/end_pfn to a struct page pointer.
	180	*/
	181	start_pg = pfn_to_page(start_pfn - 1) + 1;
	182	end_pg = pfn_to_page(end_pfn - 1) + 1;
	183
	184	/*
	185	* Convert to physical addresses, and round start upwards and end
	186	* downwards.
	187	*/
	188	pg = (unsigned long)PAGE_ALIGN(__pa(start_pg));
	189	pgend = (unsigned long)__pa(end_pg) & PAGE_MASK;
	190
	191	/*
	192	* If there are free pages between these, free the section of the
	193	* memmap array.
	194	*/
	195	if (pg < pgend)
	196	free_bootmem(pg, pgend - pg);
	197	}
	198
	199	/*
	200	* The mem_map array can get very big. Free the unused area of the memory map.
	201	*/
	202	static void __init free_unused_memmap(void)
	203	{
	204	unsigned long start, prev_end = 0;
	205	struct memblock_region *reg;
	206
	207	for_each_memblock(memory, reg) {
	208	start = __phys_to_pfn(reg->base);
	209
	210	#ifdef CONFIG_SPARSEMEM
	211	/*
	212	* Take care not to free memmap entries that don't exist due
	213	* to SPARSEMEM sections which aren't present.
	214	*/
	215	start = min(start, ALIGN(prev_end, PAGES_PER_SECTION));
	216	#endif
	217	/*
	218	* If we had a previous bank, and there is a space between the
	219	* current bank and the previous, free it.
	220	*/
	221	if (prev_end && prev_end < start)
	222	free_memmap(prev_end, start);
	223
	224	/*
	225	* Align up here since the VM subsystem insists that the
	226	* memmap entries are valid from the bank end aligned to
	227	* MAX_ORDER_NR_PAGES.
	228	*/
	229	prev_end = ALIGN(start + __phys_to_pfn(reg->size),
	230	MAX_ORDER_NR_PAGES);
	231	}
	232
	233	#ifdef CONFIG_SPARSEMEM
	234	if (!IS_ALIGNED(prev_end, PAGES_PER_SECTION))
	235	free_memmap(prev_end, ALIGN(prev_end, PAGES_PER_SECTION));
236	#endif
237	}
238	#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
239
240	/*
241	* mem_init() marks the free areas in the mem_map and tells us how much memory
242	* is free. This is done after various parts of the system have claimed their
243	* memory after the kernel image.
244	*/
245	void __init mem_init(void)
246	{
c1cc1552 CM	247	max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
	248
	249	#ifndef CONFIG_SPARSEMEM_VMEMMAP
c1cc1552 CM	250	free_unused_memmap();
c1cc1552 CM	251	#endif
bee4ebd1	252	/* this will put all unused low memory onto the freelists */
0c988534	253	free_all_bootmem();
c1cc1552	254
6879ea83	255	mem_init_print_info(NULL);
c1cc1552 CM	256
	257	#define MLK(b, t) b, t, ((t) - (b)) >> 10
	258	#define MLM(b, t) b, t, ((t) - (b)) >> 20
	259	#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
	260
	261	pr_notice("Virtual kernel memory layout:\n"
	262	" vmalloc : 0x%16lx - 0x%16lx (%6ld MB)\n"
	263	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	264	" vmemmap : 0x%16lx - 0x%16lx (%6ld MB)\n"
	265	#endif
	266	" modules : 0x%16lx - 0x%16lx (%6ld MB)\n"
	267	" memory : 0x%16lx - 0x%16lx (%6ld MB)\n"
	268	" .init : 0x%p" " - 0x%p" " (%6ld kB)\n"
	269	" .text : 0x%p" " - 0x%p" " (%6ld kB)\n"
	270	" .data : 0x%p" " - 0x%p" " (%6ld kB)\n",
	271	MLM(VMALLOC_START, VMALLOC_END),
	272	#ifdef CONFIG_SPARSEMEM_VMEMMAP
	273	MLM((unsigned long)virt_to_page(PAGE_OFFSET),
	274	(unsigned long)virt_to_page(high_memory)),
	275	#endif
	276	MLM(MODULES_VADDR, MODULES_END),
	277	MLM(PAGE_OFFSET, (unsigned long)high_memory),
	278
	279	MLK_ROUNDUP(__init_begin, __init_end),
	280	MLK_ROUNDUP(_text, _etext),
	281	MLK_ROUNDUP(_sdata, _edata));
	282
	283	#undef MLK
	284	#undef MLM
	285	#undef MLK_ROUNDUP
	286
	287	/*
	288	* Check boundaries twice: Some fundamental inconsistencies can be
	289	* detected at build time already.
	290	*/
	291	#ifdef CONFIG_COMPAT
	292	BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64);
	293	#endif
	294	BUILD_BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	295	BUG_ON(TASK_SIZE_64 > MODULES_VADDR);
	296
bee4ebd1	297	if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
c1cc1552 CM	298	extern int sysctl_overcommit_memory;
	299	/*
	300	* On a machine this small we won't get anywhere without
	301	* overcommit, so turn it on by default.
	302	*/
	303	sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
	304	}
	305	}
	306
	307	void free_initmem(void)
	308	{
9af5b807	309	free_initmem_default(0);
c1cc1552 CM	310	}
	311
	312	#ifdef CONFIG_BLK_DEV_INITRD
	313
	314	static int keep_initrd;
	315
	316	void free_initrd_mem(unsigned long start, unsigned long end)
	317	{
9af5b807 JL	318	if (!keep_initrd)
9af5b807 JL	319	free_reserved_area((void )start, (void )end, 0, "initrd");
c1cc1552 CM	320	}
	321
	322	static int __init keepinitrd_setup(char *__unused)
	323	{
	324	keep_initrd = 1;
	325	return 1;
	326	}
	327
	328	__setup("keepinitrd", keepinitrd_setup);
	329	#endif