[deliverable/linux.git] / drivers / of / of_reserved_mem.c

/*
 * Device tree based initialization code for reserved memory.
 *
 * Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.
 * Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com
 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
 * Author: Josh Cartwright <joshc@codeaurora.org>
 *
 * 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 optional) any later version of the license.
 */

#include <linux/err.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/mm.h>
#include <linux/sizes.h>
#include <linux/of_reserved_mem.h>
#include <linux/sort.h>

#define MAX_RESERVED_REGIONS	16
static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
static int reserved_mem_count;

#if defined(CONFIG_HAVE_MEMBLOCK)
#include <linux/memblock.h>
int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	phys_addr_t *res_base)
{
	phys_addr_t base;
	/*
	 * We use __memblock_alloc_base() because memblock_alloc_base()
	 * panic()s on allocation failure.
	 */
	end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
	base = __memblock_alloc_base(size, align, end);
	if (!base)
		return -ENOMEM;

	/*
	 * Check if the allocated region fits in to start..end window
	 */
	if (base < start) {
		memblock_free(base, size);
		return -ENOMEM;
	}

	*res_base = base;
	if (nomap)
		return memblock_remove(base, size);
	return 0;
}
#else
int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	phys_addr_t *res_base)
{
	pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
		  size, nomap ? " (nomap)" : "");
	return -ENOSYS;
}
#endif

/**
 * res_mem_save_node() - save fdt node for second pass initialization
 */
void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
				      phys_addr_t base, phys_addr_t size)
{
	struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];

	if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
		pr_err("Reserved memory: not enough space all defined regions.\n");
		return;
	}

	rmem->fdt_node = node;
	rmem->name = uname;
	rmem->base = base;
	rmem->size = size;

	reserved_mem_count++;
	return;
}

/**
 * res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
 *			  and 'alloc-ranges' properties
 */
static int __init __reserved_mem_alloc_size(unsigned long node,
	const char *uname, phys_addr_t *res_base, phys_addr_t *res_size)
{
	int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
	phys_addr_t start = 0, end = 0;
	phys_addr_t base = 0, align = 0, size;
	int len;
	const __be32 *prop;
	int nomap;
	int ret;

	prop = of_get_flat_dt_prop(node, "size", &len);
	if (!prop)
		return -EINVAL;

	if (len != dt_root_size_cells * sizeof(__be32)) {
		pr_err("Reserved memory: invalid size property in '%s' node.\n",
				uname);
		return -EINVAL;
	}
	size = dt_mem_next_cell(dt_root_size_cells, &prop);

	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;

	prop = of_get_flat_dt_prop(node, "alignment", &len);
	if (prop) {
		if (len != dt_root_addr_cells * sizeof(__be32)) {
			pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
				uname);
			return -EINVAL;
		}
		align = dt_mem_next_cell(dt_root_addr_cells, &prop);
	}

	/* Need adjust the alignment to satisfy the CMA requirement */
	if (IS_ENABLED(CONFIG_CMA) && of_flat_dt_is_compatible(node, "shared-dma-pool"))
		align = max(align, (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));

	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
	if (prop) {

		if (len % t_len != 0) {
			pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
			       uname);
			return -EINVAL;
		}

		base = 0;

		while (len > 0) {
			start = dt_mem_next_cell(dt_root_addr_cells, &prop);
			end = start + dt_mem_next_cell(dt_root_size_cells,
						       &prop);

			ret = early_init_dt_alloc_reserved_memory_arch(size,
					align, start, end, nomap, &base);
			if (ret == 0) {
				pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
					uname, &base,
					(unsigned long)size / SZ_1M);
				break;
			}
			len -= t_len;
		}

	} else {
		ret = early_init_dt_alloc_reserved_memory_arch(size, align,
							0, 0, nomap, &base);
		if (ret == 0)
			pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
				uname, &base, (unsigned long)size / SZ_1M);
	}

	if (base == 0) {
		pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
			uname);
		return -ENOMEM;
	}

	*res_base = base;
	*res_size = size;

	return 0;
}

static const struct of_device_id __rmem_of_table_sentinel
	__used __section(__reservedmem_of_table_end);

/**
 * res_mem_init_node() - call region specific reserved memory init code
 */
static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
{
	extern const struct of_device_id __reservedmem_of_table[];
	const struct of_device_id *i;

	for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
		reservedmem_of_init_fn initfn = i->data;
		const char *compat = i->compatible;

		if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
			continue;

		if (initfn(rmem) == 0) {
			pr_info("Reserved memory: initialized node %s, compatible id %s\n",
				rmem->name, compat);
			return 0;
		}
	}
	return -ENOENT;
}

static int __init __rmem_cmp(const void *a, const void *b)
{
	const struct reserved_mem *ra = a, *rb = b;

	if (ra->base < rb->base)
		return -1;

	if (ra->base > rb->base)
		return 1;

	return 0;
}

static void __init __rmem_check_for_overlap(void)
{
	int i;

	if (reserved_mem_count < 2)
		return;

	sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
	     __rmem_cmp, NULL);
	for (i = 0; i < reserved_mem_count - 1; i++) {
		struct reserved_mem *this, *next;

		this = &reserved_mem[i];
		next = &reserved_mem[i + 1];
		if (!(this->base && next->base))
			continue;
		if (this->base + this->size > next->base) {
			phys_addr_t this_end, next_end;

			this_end = this->base + this->size;
			next_end = next->base + next->size;
			pr_err("Reserved memory: OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
			       this->name, &this->base, &this_end,
			       next->name, &next->base, &next_end);
		}
	}
}

/**
 * fdt_init_reserved_mem - allocate and init all saved reserved memory regions
 */
void __init fdt_init_reserved_mem(void)
{
	int i;

	/* check for overlapping reserved regions */
	__rmem_check_for_overlap();

	for (i = 0; i < reserved_mem_count; i++) {
		struct reserved_mem *rmem = &reserved_mem[i];
		unsigned long node = rmem->fdt_node;
		int len;
		const __be32 *prop;
		int err = 0;

		prop = of_get_flat_dt_prop(node, "phandle", &len);
		if (!prop)
			prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
		if (prop)
			rmem->phandle = of_read_number(prop, len/4);

		if (rmem->size == 0)
			err = __reserved_mem_alloc_size(node, rmem->name,
						 &rmem->base, &rmem->size);
		if (err == 0)
			__reserved_mem_init_node(rmem);
	}
}

static inline struct reserved_mem *__find_rmem(struct device_node *node)
{
	unsigned int i;

	if (!node->phandle)
		return NULL;

	for (i = 0; i < reserved_mem_count; i++)
		if (reserved_mem[i].phandle == node->phandle)
			return &reserved_mem[i];
	return NULL;
}

/**
 * of_reserved_mem_device_init() - assign reserved memory region to given device
 *
 * This function assign memory region pointed by "memory-region" device tree
 * property to the given device.
 */
int of_reserved_mem_device_init(struct device *dev)
{
	struct reserved_mem *rmem;
	struct device_node *np;
	int ret;

	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	if (!np)
		return -ENODEV;

	rmem = __find_rmem(np);
	of_node_put(np);

	if (!rmem || !rmem->ops || !rmem->ops->device_init)
		return -EINVAL;

	ret = rmem->ops->device_init(rmem, dev);
	if (ret == 0)
		dev_info(dev, "assigned reserved memory node %s\n", rmem->name);

	return ret;
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);

/**
 * of_reserved_mem_device_release() - release reserved memory device structures
 *
 * This function releases structures allocated for memory region handling for
 * the given device.
 */
void of_reserved_mem_device_release(struct device *dev)
{
	struct reserved_mem *rmem;
	struct device_node *np;

	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	if (!np)
		return;

	rmem = __find_rmem(np);
	of_node_put(np);

	if (!rmem || !rmem->ops || !rmem->ops->device_release)
		return;

	rmem->ops->device_release(rmem, dev);
}
EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);
Commit	Line	Data
3f0c8206 MS	1	/*
	2	* Device tree based initialization code for reserved memory.
	3	*
ae1add24	4	* Copyright (c) 2013, 2015 The Linux Foundation. All Rights Reserved.
3f0c8206 MS	5	* Copyright (c) 2013,2014 Samsung Electronics Co., Ltd.
	6	* http://www.samsung.com
	7	* Author: Marek Szyprowski <m.szyprowski@samsung.com>
	8	* Author: Josh Cartwright <joshc@codeaurora.org>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of the
	13	* License or (at your optional) any later version of the license.
	14	*/
	15
	16	#include <linux/err.h>
	17	#include <linux/of.h>
	18	#include <linux/of_fdt.h>
	19	#include <linux/of_platform.h>
	20	#include <linux/mm.h>
	21	#include <linux/sizes.h>
	22	#include <linux/of_reserved_mem.h>
ae1add24	23	#include <linux/sort.h>
3f0c8206 MS	24
	25	#define MAX_RESERVED_REGIONS 16
	26	static struct reserved_mem reserved_mem[MAX_RESERVED_REGIONS];
	27	static int reserved_mem_count;
	28
	29	#if defined(CONFIG_HAVE_MEMBLOCK)
	30	#include <linux/memblock.h>
	31	int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	32	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	33	phys_addr_t *res_base)
	34	{
e53b50c0	35	phys_addr_t base;
3f0c8206 MS	36	/*
	37	* We use __memblock_alloc_base() because memblock_alloc_base()
	38	* panic()s on allocation failure.
	39	*/
e53b50c0 VM	40	end = !end ? MEMBLOCK_ALLOC_ANYWHERE : end;
e53b50c0 VM	41	base = __memblock_alloc_base(size, align, end);
3f0c8206 MS	42	if (!base)
	43	return -ENOMEM;
	44
	45	/*
	46	* Check if the allocated region fits in to start..end window
	47	*/
	48	if (base < start) {
	49	memblock_free(base, size);
	50	return -ENOMEM;
	51	}
	52
	53	*res_base = base;
	54	if (nomap)
	55	return memblock_remove(base, size);
	56	return 0;
	57	}
	58	#else
	59	int __init __weak early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
	60	phys_addr_t align, phys_addr_t start, phys_addr_t end, bool nomap,
	61	phys_addr_t *res_base)
	62	{
	63	pr_err("Reserved memory not supported, ignoring region 0x%llx%s\n",
	64	size, nomap ? " (nomap)" : "");
	65	return -ENOSYS;
	66	}
	67	#endif
	68
	69	/**
	70	* res_mem_save_node() - save fdt node for second pass initialization
	71	*/
	72	void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
	73	phys_addr_t base, phys_addr_t size)
	74	{
	75	struct reserved_mem *rmem = &reserved_mem[reserved_mem_count];
	76
	77	if (reserved_mem_count == ARRAY_SIZE(reserved_mem)) {
	78	pr_err("Reserved memory: not enough space all defined regions.\n");
	79	return;
	80	}
	81
	82	rmem->fdt_node = node;
	83	rmem->name = uname;
	84	rmem->base = base;
	85	rmem->size = size;
	86
	87	reserved_mem_count++;
	88	return;
	89	}
	90
	91	/**
	92	* res_mem_alloc_size() - allocate reserved memory described by 'size', 'align'
	93	* and 'alloc-ranges' properties
	94	*/
	95	static int __init __reserved_mem_alloc_size(unsigned long node,
	96	const char uname, phys_addr_t res_base, phys_addr_t *res_size)
	97	{
	98	int t_len = (dt_root_addr_cells + dt_root_size_cells) * sizeof(__be32);
	99	phys_addr_t start = 0, end = 0;
	100	phys_addr_t base = 0, align = 0, size;
9d0c4dfe RH	101	int len;
9d0c4dfe RH	102	const __be32 *prop;
3f0c8206 MS	103	int nomap;
	104	int ret;
	105
	106	prop = of_get_flat_dt_prop(node, "size", &len);
	107	if (!prop)
	108	return -EINVAL;
	109
	110	if (len != dt_root_size_cells * sizeof(__be32)) {
	111	pr_err("Reserved memory: invalid size property in '%s' node.\n",
	112	uname);
	113	return -EINVAL;
	114	}
	115	size = dt_mem_next_cell(dt_root_size_cells, &prop);
	116
	117	nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL;
	118
	119	prop = of_get_flat_dt_prop(node, "alignment", &len);
	120	if (prop) {
	121	if (len != dt_root_addr_cells * sizeof(__be32)) {
	122	pr_err("Reserved memory: invalid alignment property in '%s' node.\n",
	123	uname);
	124	return -EINVAL;
	125	}
	126	align = dt_mem_next_cell(dt_root_addr_cells, &prop);
	127	}
	128
1cc8e345 JL	129	/* Need adjust the alignment to satisfy the CMA requirement */
	130	if (IS_ENABLED(CONFIG_CMA) && of_flat_dt_is_compatible(node, "shared-dma-pool"))
	131	align = max(align, (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
	132
3f0c8206 MS	133	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);
	134	if (prop) {
	135
	136	if (len % t_len != 0) {
	137	pr_err("Reserved memory: invalid alloc-ranges property in '%s', skipping node.\n",
	138	uname);
	139	return -EINVAL;
	140	}
	141
	142	base = 0;
	143
	144	while (len > 0) {
	145	start = dt_mem_next_cell(dt_root_addr_cells, &prop);
	146	end = start + dt_mem_next_cell(dt_root_size_cells,
	147	&prop);
	148
	149	ret = early_init_dt_alloc_reserved_memory_arch(size,
	150	align, start, end, nomap, &base);
	151	if (ret == 0) {
	152	pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
	153	uname, &base,
	154	(unsigned long)size / SZ_1M);
	155	break;
	156	}
	157	len -= t_len;
	158	}
	159
	160	} else {
	161	ret = early_init_dt_alloc_reserved_memory_arch(size, align,
	162	0, 0, nomap, &base);
	163	if (ret == 0)
	164	pr_debug("Reserved memory: allocated memory for '%s' node: base %pa, size %ld MiB\n",
	165	uname, &base, (unsigned long)size / SZ_1M);
	166	}
	167
	168	if (base == 0) {
	169	pr_info("Reserved memory: failed to allocate memory for node '%s'\n",
	170	uname);
	171	return -ENOMEM;
	172	}
	173
	174	*res_base = base;
	175	*res_size = size;
	176
	177	return 0;
	178	}
	179
f618c470 MS	180	static const struct of_device_id __rmem_of_table_sentinel
	181	__used __section(__reservedmem_of_table_end);
	182
	183	/**
	184	* res_mem_init_node() - call region specific reserved memory init code
	185	*/
	186	static int __init __reserved_mem_init_node(struct reserved_mem *rmem)
	187	{
	188	extern const struct of_device_id __reservedmem_of_table[];
	189	const struct of_device_id *i;
	190
	191	for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) {
	192	reservedmem_of_init_fn initfn = i->data;
	193	const char *compat = i->compatible;
	194
	195	if (!of_flat_dt_is_compatible(rmem->fdt_node, compat))
	196	continue;
	197
9dd31075	198	if (initfn(rmem) == 0) {
f618c470 MS	199	pr_info("Reserved memory: initialized node %s, compatible id %s\n",
	200	rmem->name, compat);
	201	return 0;
	202	}
	203	}
	204	return -ENOENT;
	205	}
	206
ae1add24 MH	207	static int __init __rmem_cmp(const void a, const void b)
	208	{
	209	const struct reserved_mem ra = a, rb = b;
	210
9eb8cd2b ME	211	if (ra->base < rb->base)
	212	return -1;
	213
	214	if (ra->base > rb->base)
	215	return 1;
	216
	217	return 0;
ae1add24 MH	218	}
	219
	220	static void __init __rmem_check_for_overlap(void)
	221	{
	222	int i;
	223
	224	if (reserved_mem_count < 2)
	225	return;
	226
	227	sort(reserved_mem, reserved_mem_count, sizeof(reserved_mem[0]),
	228	__rmem_cmp, NULL);
	229	for (i = 0; i < reserved_mem_count - 1; i++) {
	230	struct reserved_mem this, next;
	231
	232	this = &reserved_mem[i];
	233	next = &reserved_mem[i + 1];
	234	if (!(this->base && next->base))
	235	continue;
	236	if (this->base + this->size > next->base) {
	237	phys_addr_t this_end, next_end;
	238
	239	this_end = this->base + this->size;
	240	next_end = next->base + next->size;
85a1c77f ME	241	pr_err("Reserved memory: OVERLAP DETECTED!\n%s (%pa--%pa) overlaps with %s (%pa--%pa)\n",
	242	this->name, &this->base, &this_end,
	243	next->name, &next->base, &next_end);
ae1add24 MH	244	}
	245	}
	246	}
	247
3f0c8206 MS	248	/**
	249	* fdt_init_reserved_mem - allocate and init all saved reserved memory regions
	250	*/
	251	void __init fdt_init_reserved_mem(void)
	252	{
	253	int i;
ae1add24 MH	254
	255	/* check for overlapping reserved regions */
	256	__rmem_check_for_overlap();
	257
3f0c8206 MS	258	for (i = 0; i < reserved_mem_count; i++) {
	259	struct reserved_mem *rmem = &reserved_mem[i];
	260	unsigned long node = rmem->fdt_node;
9dcfee01 MS	261	int len;
9dcfee01 MS	262	const __be32 *prop;
3f0c8206 MS	263	int err = 0;
3f0c8206 MS	264
9dcfee01 MS	265	prop = of_get_flat_dt_prop(node, "phandle", &len);
	266	if (!prop)
	267	prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
	268	if (prop)
	269	rmem->phandle = of_read_number(prop, len/4);
	270
3f0c8206 MS	271	if (rmem->size == 0)
	272	err = __reserved_mem_alloc_size(node, rmem->name,
	273	&rmem->base, &rmem->size);
f618c470 MS	274	if (err == 0)
f618c470 MS	275	__reserved_mem_init_node(rmem);
3f0c8206 MS	276	}
3f0c8206 MS	277	}
9dcfee01 MS	278
	279	static inline struct reserved_mem __find_rmem(struct device_node node)
	280	{
	281	unsigned int i;
	282
	283	if (!node->phandle)
	284	return NULL;
	285
	286	for (i = 0; i < reserved_mem_count; i++)
	287	if (reserved_mem[i].phandle == node->phandle)
	288	return &reserved_mem[i];
	289	return NULL;
	290	}
	291
	292	/**
	293	* of_reserved_mem_device_init() - assign reserved memory region to given device
	294	*
	295	* This function assign memory region pointed by "memory-region" device tree
	296	* property to the given device.
	297	*/
47f29df7	298	int of_reserved_mem_device_init(struct device *dev)
9dcfee01 MS	299	{
	300	struct reserved_mem *rmem;
	301	struct device_node *np;
47f29df7	302	int ret;
9dcfee01 MS	303
	304	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	305	if (!np)
47f29df7	306	return -ENODEV;
9dcfee01 MS	307
	308	rmem = __find_rmem(np);
	309	of_node_put(np);
	310
	311	if (!rmem \|\| !rmem->ops \|\| !rmem->ops->device_init)
47f29df7 MS	312	return -EINVAL;
	313
	314	ret = rmem->ops->device_init(rmem, dev);
	315	if (ret == 0)
	316	dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
9dcfee01	317
47f29df7	318	return ret;
9dcfee01	319	}
615fde79	320	EXPORT_SYMBOL_GPL(of_reserved_mem_device_init);
9dcfee01 MS	321
	322	/**
	323	* of_reserved_mem_device_release() - release reserved memory device structures
	324	*
	325	* This function releases structures allocated for memory region handling for
	326	* the given device.
	327	*/
	328	void of_reserved_mem_device_release(struct device *dev)
	329	{
	330	struct reserved_mem *rmem;
	331	struct device_node *np;
	332
	333	np = of_parse_phandle(dev->of_node, "memory-region", 0);
	334	if (!np)
	335	return;
	336
	337	rmem = __find_rmem(np);
	338	of_node_put(np);
	339
	340	if (!rmem \|\| !rmem->ops \|\| !rmem->ops->device_release)
	341	return;
	342
	343	rmem->ops->device_release(rmem, dev);
	344	}
615fde79	345	EXPORT_SYMBOL_GPL(of_reserved_mem_device_release);