[thirdparty/linux.git] / kernel / dma / contiguous.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Contiguous Memory Allocator for DMA mapping framework
 * Copyright (c) 2010-2011 by Samsung Electronics.
 * Written by:
 *	Marek Szyprowski <m.szyprowski@samsung.com>
 *	Michal Nazarewicz <mina86@mina86.com>
 */

#define pr_fmt(fmt) "cma: " fmt

#ifdef CONFIG_CMA_DEBUG
#ifndef DEBUG
#  define DEBUG
#endif
#endif

#include <asm/page.h>
#include <asm/dma-contiguous.h>

#include <linux/memblock.h>
#include <linux/err.h>
#include <linux/sizes.h>
#include <linux/dma-contiguous.h>
#include <linux/cma.h>

#ifdef CONFIG_CMA_SIZE_MBYTES
#define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
#else
#define CMA_SIZE_MBYTES 0
#endif

struct cma *dma_contiguous_default_area;

/*
 * Default global CMA area size can be defined in kernel's .config.
 * This is useful mainly for distro maintainers to create a kernel
 * that works correctly for most supported systems.
 * The size can be set in bytes or as a percentage of the total memory
 * in the system.
 *
 * Users, who want to set the size of global CMA area for their system
 * should use cma= kernel parameter.
 */
static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M;
static phys_addr_t size_cmdline = -1;
static phys_addr_t base_cmdline;
static phys_addr_t limit_cmdline;

static int __init early_cma(char *p)
{
	if (!p) {
		pr_err("Config string not provided\n");
		return -EINVAL;
	}

	size_cmdline = memparse(p, &p);
	if (*p != '@')
		return 0;
	base_cmdline = memparse(p + 1, &p);
	if (*p != '-') {
		limit_cmdline = base_cmdline + size_cmdline;
		return 0;
	}
	limit_cmdline = memparse(p + 1, &p);

	return 0;
}
early_param("cma", early_cma);

#ifdef CONFIG_CMA_SIZE_PERCENTAGE

static phys_addr_t __init __maybe_unused cma_early_percent_memory(void)
{
	struct memblock_region *reg;
	unsigned long total_pages = 0;

	/*
	 * We cannot use memblock_phys_mem_size() here, because
	 * memblock_analyze() has not been called yet.
	 */
	for_each_memblock(memory, reg)
		total_pages += memblock_region_memory_end_pfn(reg) -
			       memblock_region_memory_base_pfn(reg);

	return (total_pages * CONFIG_CMA_SIZE_PERCENTAGE / 100) << PAGE_SHIFT;
}

#else

static inline __maybe_unused phys_addr_t cma_early_percent_memory(void)
{
	return 0;
}

#endif

/**
 * dma_contiguous_reserve() - reserve area(s) for contiguous memory handling
 * @limit: End address of the reserved memory (optional, 0 for any).
 *
 * This function reserves memory from early allocator. It should be
 * called by arch specific code once the early allocator (memblock or bootmem)
 * has been activated and all other subsystems have already allocated/reserved
 * memory.
 */
void __init dma_contiguous_reserve(phys_addr_t limit)
{
	phys_addr_t selected_size = 0;
	phys_addr_t selected_base = 0;
	phys_addr_t selected_limit = limit;
	bool fixed = false;

	pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit);

	if (size_cmdline != -1) {
		selected_size = size_cmdline;
		selected_base = base_cmdline;
		selected_limit = min_not_zero(limit_cmdline, limit);
		if (base_cmdline + size_cmdline == limit_cmdline)
			fixed = true;
	} else {
#ifdef CONFIG_CMA_SIZE_SEL_MBYTES
		selected_size = size_bytes;
#elif defined(CONFIG_CMA_SIZE_SEL_PERCENTAGE)
		selected_size = cma_early_percent_memory();
#elif defined(CONFIG_CMA_SIZE_SEL_MIN)
		selected_size = min(size_bytes, cma_early_percent_memory());
#elif defined(CONFIG_CMA_SIZE_SEL_MAX)
		selected_size = max(size_bytes, cma_early_percent_memory());
#endif
	}

	if (selected_size && !dma_contiguous_default_area) {
		pr_debug("%s: reserving %ld MiB for global area\n", __func__,
			 (unsigned long)selected_size / SZ_1M);

		dma_contiguous_reserve_area(selected_size, selected_base,
					    selected_limit,
					    &dma_contiguous_default_area,
					    fixed);
	}
}

/**
 * dma_contiguous_reserve_area() - reserve custom contiguous area
 * @size: Size of the reserved area (in bytes),
 * @base: Base address of the reserved area optional, use 0 for any
 * @limit: End address of the reserved memory (optional, 0 for any).
 * @res_cma: Pointer to store the created cma region.
 * @fixed: hint about where to place the reserved area
 *
 * This function reserves memory from early allocator. It should be
 * called by arch specific code once the early allocator (memblock or bootmem)
 * has been activated and all other subsystems have already allocated/reserved
 * memory. This function allows to create custom reserved areas for specific
 * devices.
 *
 * If @fixed is true, reserve contiguous area at exactly @base.  If false,
 * reserve in range from @base to @limit.
 */
int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
				       phys_addr_t limit, struct cma **res_cma,
				       bool fixed)
{
	int ret;

	ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed,
					"reserved", res_cma);
	if (ret)
		return ret;

	/* Architecture specific contiguous memory fixup. */
	dma_contiguous_early_fixup(cma_get_base(*res_cma),
				cma_get_size(*res_cma));

	return 0;
}

/**
 * dma_alloc_from_contiguous() - allocate pages from contiguous area
 * @dev:   Pointer to device for which the allocation is performed.
 * @count: Requested number of pages.
 * @align: Requested alignment of pages (in PAGE_SIZE order).
 * @no_warn: Avoid printing message about failed allocation.
 *
 * This function allocates memory buffer for specified device. It uses
 * device specific contiguous memory area if available or the default
 * global one. Requires architecture specific dev_get_cma_area() helper
 * function.
 */
struct page *dma_alloc_from_contiguous(struct device *dev, size_t count,
				       unsigned int align, bool no_warn)
{
	if (align > CONFIG_CMA_ALIGNMENT)
		align = CONFIG_CMA_ALIGNMENT;

	return cma_alloc(dev_get_cma_area(dev), count, align, no_warn);
}

/**
 * dma_release_from_contiguous() - release allocated pages
 * @dev:   Pointer to device for which the pages were allocated.
 * @pages: Allocated pages.
 * @count: Number of allocated pages.
 *
 * This function releases memory allocated by dma_alloc_from_contiguous().
 * It returns false when provided pages do not belong to contiguous area and
 * true otherwise.
 */
bool dma_release_from_contiguous(struct device *dev, struct page *pages,
				 int count)
{
	return cma_release(dev_get_cma_area(dev), pages, count);
}

/**
 * dma_alloc_contiguous() - allocate contiguous pages
 * @dev:   Pointer to device for which the allocation is performed.
 * @size:  Requested allocation size.
 * @gfp:   Allocation flags.
 *
 * This function allocates contiguous memory buffer for specified device. It
 * first tries to use device specific contiguous memory area if available or
 * the default global one, then tries a fallback allocation of normal pages.
 *
 * Note that it byapss one-page size of allocations from the global area as
 * the addresses within one page are always contiguous, so there is no need
 * to waste CMA pages for that kind; it also helps reduce fragmentations.
 */
struct page *dma_alloc_contiguous(struct device *dev, size_t size, gfp_t gfp)
{
	int node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
	size_t count = PAGE_ALIGN(size) >> PAGE_SHIFT;
	size_t align = get_order(PAGE_ALIGN(size));
	struct page *page = NULL;
	struct cma *cma = NULL;

	if (dev && dev->cma_area)
		cma = dev->cma_area;
	else if (count > 1)
		cma = dma_contiguous_default_area;

	/* CMA can be used only in the context which permits sleeping */
	if (cma && gfpflags_allow_blocking(gfp)) {
		size_t cma_align = min_t(size_t, align, CONFIG_CMA_ALIGNMENT);

		page = cma_alloc(cma, count, cma_align, gfp & __GFP_NOWARN);
	}

	/* Fallback allocation of normal pages */
	if (!page)
		page = alloc_pages_node(node, gfp, align);
	return page;
}

/**
 * dma_free_contiguous() - release allocated pages
 * @dev:   Pointer to device for which the pages were allocated.
 * @page:  Pointer to the allocated pages.
 * @size:  Size of allocated pages.
 *
 * This function releases memory allocated by dma_alloc_contiguous(). As the
 * cma_release returns false when provided pages do not belong to contiguous
 * area and true otherwise, this function then does a fallback __free_pages()
 * upon a false-return.
 */
void dma_free_contiguous(struct device *dev, struct page *page, size_t size)
{
	if (!cma_release(dev_get_cma_area(dev), page,
			 PAGE_ALIGN(size) >> PAGE_SHIFT))
		__free_pages(page, get_order(size));
}

/*
 * Support for reserved memory regions defined in device tree
 */
#ifdef CONFIG_OF_RESERVED_MEM
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_reserved_mem.h>

#undef pr_fmt
#define pr_fmt(fmt) fmt

static int rmem_cma_device_init(struct reserved_mem *rmem, struct device *dev)
{
	dev_set_cma_area(dev, rmem->priv);
	return 0;
}

static void rmem_cma_device_release(struct reserved_mem *rmem,
				    struct device *dev)
{
	dev_set_cma_area(dev, NULL);
}

static const struct reserved_mem_ops rmem_cma_ops = {
	.device_init	= rmem_cma_device_init,
	.device_release = rmem_cma_device_release,
};

static int __init rmem_cma_setup(struct reserved_mem *rmem)
{
	phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
	phys_addr_t mask = align - 1;
	unsigned long node = rmem->fdt_node;
	struct cma *cma;
	int err;

	if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
	    of_get_flat_dt_prop(node, "no-map", NULL))
		return -EINVAL;

	if ((rmem->base & mask) || (rmem->size & mask)) {
		pr_err("Reserved memory: incorrect alignment of CMA region\n");
		return -EINVAL;
	}

	err = cma_init_reserved_mem(rmem->base, rmem->size, 0, rmem->name, &cma);
	if (err) {
		pr_err("Reserved memory: unable to setup CMA region\n");
		return err;
	}
	/* Architecture specific contiguous memory fixup. */
	dma_contiguous_early_fixup(rmem->base, rmem->size);

	if (of_get_flat_dt_prop(node, "linux,cma-default", NULL))
		dma_contiguous_set_default(cma);

	rmem->ops = &rmem_cma_ops;
	rmem->priv = cma;

	pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n",
		&rmem->base, (unsigned long)rmem->size / SZ_1M);

	return 0;
}
RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup);
#endif
Commit	Line	Data
989d42e8	1	// SPDX-License-Identifier: GPL-2.0+
c64be2bb MS	2	/*
	3	* Contiguous Memory Allocator for DMA mapping framework
	4	* Copyright (c) 2010-2011 by Samsung Electronics.
	5	* Written by:
	6	* Marek Szyprowski <m.szyprowski@samsung.com>
	7	* Michal Nazarewicz <mina86@mina86.com>
c64be2bb MS	8	*/
	9
	10	#define pr_fmt(fmt) "cma: " fmt
	11
	12	#ifdef CONFIG_CMA_DEBUG
	13	#ifndef DEBUG
	14	# define DEBUG
	15	#endif
	16	#endif
	17
	18	#include <asm/page.h>
	19	#include <asm/dma-contiguous.h>
	20
	21	#include <linux/memblock.h>
	22	#include <linux/err.h>
446c82fc	23	#include <linux/sizes.h>
c64be2bb	24	#include <linux/dma-contiguous.h>
a254129e	25	#include <linux/cma.h>
c64be2bb MS	26
	27	#ifdef CONFIG_CMA_SIZE_MBYTES
	28	#define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
	29	#else
	30	#define CMA_SIZE_MBYTES 0
	31	#endif
	32
a254129e JK	33	struct cma *dma_contiguous_default_area;
a254129e JK	34
c64be2bb MS	35	/*
c64be2bb MS	36	* Default global CMA area size can be defined in kernel's .config.
73678804	37	* This is useful mainly for distro maintainers to create a kernel
c64be2bb MS	38	* that works correctly for most supported systems.
	39	* The size can be set in bytes or as a percentage of the total memory
	40	* in the system.
	41	*
	42	* Users, who want to set the size of global CMA area for their system
	43	* should use cma= kernel parameter.
	44	*/
a785ce9c	45	static const phys_addr_t size_bytes = (phys_addr_t)CMA_SIZE_MBYTES * SZ_1M;
4009793e	46	static phys_addr_t size_cmdline = -1;
5ea3b1b2 AM	47	static phys_addr_t base_cmdline;
5ea3b1b2 AM	48	static phys_addr_t limit_cmdline;
c64be2bb MS	49
	50	static int __init early_cma(char *p)
	51	{
a3ceed87 HZ	52	if (!p) {
	53	pr_err("Config string not provided\n");
	54	return -EINVAL;
	55	}
	56
c64be2bb	57	size_cmdline = memparse(p, &p);
5ea3b1b2 AM	58	if (*p != '@')
	59	return 0;
	60	base_cmdline = memparse(p + 1, &p);
	61	if (*p != '-') {
	62	limit_cmdline = base_cmdline + size_cmdline;
	63	return 0;
	64	}
	65	limit_cmdline = memparse(p + 1, &p);
	66
c64be2bb MS	67	return 0;
	68	}
	69	early_param("cma", early_cma);
	70
	71	#ifdef CONFIG_CMA_SIZE_PERCENTAGE
	72
4009793e	73	static phys_addr_t __init __maybe_unused cma_early_percent_memory(void)
c64be2bb MS	74	{
	75	struct memblock_region *reg;
	76	unsigned long total_pages = 0;
	77
	78	/*
	79	* We cannot use memblock_phys_mem_size() here, because
	80	* memblock_analyze() has not been called yet.
	81	*/
	82	for_each_memblock(memory, reg)
	83	total_pages += memblock_region_memory_end_pfn(reg) -
	84	memblock_region_memory_base_pfn(reg);
	85
	86	return (total_pages * CONFIG_CMA_SIZE_PERCENTAGE / 100) << PAGE_SHIFT;
	87	}
	88
	89	#else
	90
4009793e	91	static inline __maybe_unused phys_addr_t cma_early_percent_memory(void)
c64be2bb MS	92	{
	93	return 0;
	94	}
	95
	96	#endif
	97
	98	/**
a2547380	99	* dma_contiguous_reserve() - reserve area(s) for contiguous memory handling
c64be2bb MS	100	* @limit: End address of the reserved memory (optional, 0 for any).
	101	*
	102	* This function reserves memory from early allocator. It should be
	103	* called by arch specific code once the early allocator (memblock or bootmem)
	104	* has been activated and all other subsystems have already allocated/reserved
	105	* memory.
	106	*/
	107	void __init dma_contiguous_reserve(phys_addr_t limit)
	108	{
4009793e	109	phys_addr_t selected_size = 0;
5ea3b1b2 AM	110	phys_addr_t selected_base = 0;
	111	phys_addr_t selected_limit = limit;
	112	bool fixed = false;
c64be2bb MS	113
	114	pr_debug("%s(limit %08lx)\n", __func__, (unsigned long)limit);
	115
	116	if (size_cmdline != -1) {
	117	selected_size = size_cmdline;
5ea3b1b2 AM	118	selected_base = base_cmdline;
	119	selected_limit = min_not_zero(limit_cmdline, limit);
	120	if (base_cmdline + size_cmdline == limit_cmdline)
	121	fixed = true;
c64be2bb MS	122	} else {
	123	#ifdef CONFIG_CMA_SIZE_SEL_MBYTES
	124	selected_size = size_bytes;
	125	#elif defined(CONFIG_CMA_SIZE_SEL_PERCENTAGE)
	126	selected_size = cma_early_percent_memory();
	127	#elif defined(CONFIG_CMA_SIZE_SEL_MIN)
	128	selected_size = min(size_bytes, cma_early_percent_memory());
	129	#elif defined(CONFIG_CMA_SIZE_SEL_MAX)
	130	selected_size = max(size_bytes, cma_early_percent_memory());
	131	#endif
	132	}
	133
a2547380	134	if (selected_size && !dma_contiguous_default_area) {
c64be2bb	135	pr_debug("%s: reserving %ld MiB for global area\n", __func__,
4009793e	136	(unsigned long)selected_size / SZ_1M);
c64be2bb	137
5ea3b1b2 AM	138	dma_contiguous_reserve_area(selected_size, selected_base,
	139	selected_limit,
	140	&dma_contiguous_default_area,
	141	fixed);
c64be2bb	142	}
5ea3b1b2	143	}
c64be2bb	144
3162bbd7 JK	145	/**
	146	* dma_contiguous_reserve_area() - reserve custom contiguous area
	147	* @size: Size of the reserved area (in bytes),
	148	* @base: Base address of the reserved area optional, use 0 for any
	149	* @limit: End address of the reserved memory (optional, 0 for any).
	150	* @res_cma: Pointer to store the created cma region.
	151	* @fixed: hint about where to place the reserved area
	152	*
	153	* This function reserves memory from early allocator. It should be
	154	* called by arch specific code once the early allocator (memblock or bootmem)
	155	* has been activated and all other subsystems have already allocated/reserved
	156	* memory. This function allows to create custom reserved areas for specific
	157	* devices.
	158	*
	159	* If @fixed is true, reserve contiguous area at exactly @base. If false,
	160	* reserve in range from @base to @limit.
	161	*/
	162	int __init dma_contiguous_reserve_area(phys_addr_t size, phys_addr_t base,
	163	phys_addr_t limit, struct cma **res_cma,
	164	bool fixed)
	165	{
	166	int ret;
	167
f318dd08 LA	168	ret = cma_declare_contiguous(base, size, limit, 0, 0, fixed,
f318dd08 LA	169	"reserved", res_cma);
3162bbd7 JK	170	if (ret)
	171	return ret;
	172
	173	/* Architecture specific contiguous memory fixup. */
a254129e JK	174	dma_contiguous_early_fixup(cma_get_base(*res_cma),
a254129e JK	175	cma_get_size(*res_cma));
3162bbd7 JK	176
	177	return 0;
	178	}
	179
c64be2bb	180	/**
3162bbd7 JK	181	* dma_alloc_from_contiguous() - allocate pages from contiguous area
	182	* @dev: Pointer to device for which the allocation is performed.
	183	* @count: Requested number of pages.
	184	* @align: Requested alignment of pages (in PAGE_SIZE order).
d834c5ab	185	* @no_warn: Avoid printing message about failed allocation.
c64be2bb	186	*
3162bbd7 JK	187	* This function allocates memory buffer for specified device. It uses
	188	* device specific contiguous memory area if available or the default
	189	* global one. Requires architecture specific dev_get_cma_area() helper
	190	* function.
c64be2bb	191	*/
67a2e213	192	struct page dma_alloc_from_contiguous(struct device dev, size_t count,
d834c5ab	193	unsigned int align, bool no_warn)
c64be2bb	194	{
3162bbd7 JK	195	if (align > CONFIG_CMA_ALIGNMENT)
	196	align = CONFIG_CMA_ALIGNMENT;
	197
d834c5ab	198	return cma_alloc(dev_get_cma_area(dev), count, align, no_warn);
c64be2bb	199	}
3162bbd7 JK	200
	201	/**
	202	* dma_release_from_contiguous() - release allocated pages
	203	* @dev: Pointer to device for which the pages were allocated.
	204	* @pages: Allocated pages.
	205	* @count: Number of allocated pages.
	206	*
	207	* This function releases memory allocated by dma_alloc_from_contiguous().
	208	* It returns false when provided pages do not belong to contiguous area and
	209	* true otherwise.
	210	*/
	211	bool dma_release_from_contiguous(struct device dev, struct page pages,
	212	int count)
	213	{
a254129e	214	return cma_release(dev_get_cma_area(dev), pages, count);
3162bbd7	215	}
de9e14ee	216
b1d2dc00 NC	217	/**
	218	* dma_alloc_contiguous() - allocate contiguous pages
	219	* @dev: Pointer to device for which the allocation is performed.
	220	* @size: Requested allocation size.
	221	* @gfp: Allocation flags.
	222	*
	223	* This function allocates contiguous memory buffer for specified device. It
	224	* first tries to use device specific contiguous memory area if available or
	225	* the default global one, then tries a fallback allocation of normal pages.
bd2e7563 NC	226	*
	227	* Note that it byapss one-page size of allocations from the global area as
	228	* the addresses within one page are always contiguous, so there is no need
	229	* to waste CMA pages for that kind; it also helps reduce fragmentations.
b1d2dc00 NC	230	*/
	231	struct page dma_alloc_contiguous(struct device dev, size_t size, gfp_t gfp)
	232	{
	233	int node = dev ? dev_to_node(dev) : NUMA_NO_NODE;
	234	size_t count = PAGE_ALIGN(size) >> PAGE_SHIFT;
	235	size_t align = get_order(PAGE_ALIGN(size));
b1d2dc00	236	struct page *page = NULL;
bd2e7563 NC	237	struct cma *cma = NULL;
	238
	239	if (dev && dev->cma_area)
	240	cma = dev->cma_area;
	241	else if (count > 1)
	242	cma = dma_contiguous_default_area;
b1d2dc00 NC	243
	244	/* CMA can be used only in the context which permits sleeping */
	245	if (cma && gfpflags_allow_blocking(gfp)) {
c6622a42 NC	246	size_t cma_align = min_t(size_t, align, CONFIG_CMA_ALIGNMENT);
	247
	248	page = cma_alloc(cma, count, cma_align, gfp & __GFP_NOWARN);
b1d2dc00 NC	249	}
	250
	251	/* Fallback allocation of normal pages */
	252	if (!page)
	253	page = alloc_pages_node(node, gfp, align);
	254	return page;
	255	}
	256
	257	/**
	258	* dma_free_contiguous() - release allocated pages
	259	* @dev: Pointer to device for which the pages were allocated.
	260	* @page: Pointer to the allocated pages.
	261	* @size: Size of allocated pages.
	262	*
	263	* This function releases memory allocated by dma_alloc_contiguous(). As the
	264	* cma_release returns false when provided pages do not belong to contiguous
	265	* area and true otherwise, this function then does a fallback __free_pages()
	266	* upon a false-return.
	267	*/
	268	void dma_free_contiguous(struct device dev, struct page page, size_t size)
	269	{
f46cc015 NC	270	if (!cma_release(dev_get_cma_area(dev), page,
f46cc015 NC	271	PAGE_ALIGN(size) >> PAGE_SHIFT))
b1d2dc00 NC	272	__free_pages(page, get_order(size));
	273	}
	274
de9e14ee MS	275	/*
	276	* Support for reserved memory regions defined in device tree
	277	*/
	278	#ifdef CONFIG_OF_RESERVED_MEM
	279	#include <linux/of.h>
	280	#include <linux/of_fdt.h>
	281	#include <linux/of_reserved_mem.h>
	282
	283	#undef pr_fmt
	284	#define pr_fmt(fmt) fmt
	285
47f29df7	286	static int rmem_cma_device_init(struct reserved_mem rmem, struct device dev)
de9e14ee MS	287	{
de9e14ee MS	288	dev_set_cma_area(dev, rmem->priv);
47f29df7	289	return 0;
de9e14ee MS	290	}
	291
	292	static void rmem_cma_device_release(struct reserved_mem *rmem,
	293	struct device *dev)
	294	{
	295	dev_set_cma_area(dev, NULL);
	296	}
	297
	298	static const struct reserved_mem_ops rmem_cma_ops = {
	299	.device_init = rmem_cma_device_init,
	300	.device_release = rmem_cma_device_release,
	301	};
	302
	303	static int __init rmem_cma_setup(struct reserved_mem *rmem)
	304	{
	305	phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
	306	phys_addr_t mask = align - 1;
	307	unsigned long node = rmem->fdt_node;
	308	struct cma *cma;
	309	int err;
	310
	311	if (!of_get_flat_dt_prop(node, "reusable", NULL) \|\|
	312	of_get_flat_dt_prop(node, "no-map", NULL))
	313	return -EINVAL;
	314
	315	if ((rmem->base & mask) \|\| (rmem->size & mask)) {
	316	pr_err("Reserved memory: incorrect alignment of CMA region\n");
	317	return -EINVAL;
	318	}
	319
f318dd08	320	err = cma_init_reserved_mem(rmem->base, rmem->size, 0, rmem->name, &cma);
de9e14ee MS	321	if (err) {
	322	pr_err("Reserved memory: unable to setup CMA region\n");
	323	return err;
	324	}
	325	/* Architecture specific contiguous memory fixup. */
	326	dma_contiguous_early_fixup(rmem->base, rmem->size);
	327
	328	if (of_get_flat_dt_prop(node, "linux,cma-default", NULL))
	329	dma_contiguous_set_default(cma);
	330
	331	rmem->ops = &rmem_cma_ops;
	332	rmem->priv = cma;
	333
	334	pr_info("Reserved memory: created CMA memory pool at %pa, size %ld MiB\n",
	335	&rmem->base, (unsigned long)rmem->size / SZ_1M);
	336
	337	return 0;
	338	}
	339	RESERVEDMEM_OF_DECLARE(cma, "shared-dma-pool", rmem_cma_setup);
	340	#endif