[linux-block.git] / arch / arm64 / mm / dma-mapping.c

/*
 * SWIOTLB-based DMA API implementation
 *
 * Copyright (C) 2012 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *
 * 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/gfp.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/dma-contiguous.h>
#include <linux/vmalloc.h>
#include <linux/swiotlb.h>

#include <asm/cacheflush.h>

struct dma_map_ops *dma_ops;
EXPORT_SYMBOL(dma_ops);

static pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot,
				 bool coherent)
{
	if (!coherent || dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs))
		return pgprot_writecombine(prot);
	return prot;
}

static void *__dma_alloc_coherent(struct device *dev, size_t size,
				  dma_addr_t *dma_handle, gfp_t flags,
				  struct dma_attrs *attrs)
{
	if (dev == NULL) {
		WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
		return NULL;
	}

	if (IS_ENABLED(CONFIG_ZONE_DMA) &&
	    dev->coherent_dma_mask <= DMA_BIT_MASK(32))
		flags |= GFP_DMA;
	if (IS_ENABLED(CONFIG_DMA_CMA)) {
		struct page *page;

		size = PAGE_ALIGN(size);
		page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
							get_order(size));
		if (!page)
			return NULL;

		*dma_handle = phys_to_dma(dev, page_to_phys(page));
		return page_address(page);
	} else {
		return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
	}
}

static void __dma_free_coherent(struct device *dev, size_t size,
				void *vaddr, dma_addr_t dma_handle,
				struct dma_attrs *attrs)
{
	if (dev == NULL) {
		WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
		return;
	}

	if (IS_ENABLED(CONFIG_DMA_CMA)) {
		phys_addr_t paddr = dma_to_phys(dev, dma_handle);

		dma_release_from_contiguous(dev,
					phys_to_page(paddr),
					size >> PAGE_SHIFT);
	} else {
		swiotlb_free_coherent(dev, size, vaddr, dma_handle);
	}
}

static void *__dma_alloc_noncoherent(struct device *dev, size_t size,
				     dma_addr_t *dma_handle, gfp_t flags,
				     struct dma_attrs *attrs)
{
	struct page *page, **map;
	void *ptr, *coherent_ptr;
	int order, i;

	size = PAGE_ALIGN(size);
	order = get_order(size);

	ptr = __dma_alloc_coherent(dev, size, dma_handle, flags, attrs);
	if (!ptr)
		goto no_mem;
	map = kmalloc(sizeof(struct page *) << order, flags & ~GFP_DMA);
	if (!map)
		goto no_map;

	/* remove any dirty cache lines on the kernel alias */
	__dma_flush_range(ptr, ptr + size);

	/* create a coherent mapping */
	page = virt_to_page(ptr);
	for (i = 0; i < (size >> PAGE_SHIFT); i++)
		map[i] = page + i;
	coherent_ptr = vmap(map, size >> PAGE_SHIFT, VM_MAP,
			    __get_dma_pgprot(attrs, pgprot_default, false));
	kfree(map);
	if (!coherent_ptr)
		goto no_map;

	return coherent_ptr;

no_map:
	__dma_free_coherent(dev, size, ptr, *dma_handle, attrs);
no_mem:
	*dma_handle = ~0;
	return NULL;
}

static void __dma_free_noncoherent(struct device *dev, size_t size,
				   void *vaddr, dma_addr_t dma_handle,
				   struct dma_attrs *attrs)
{
	void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));

	vunmap(vaddr);
	__dma_free_coherent(dev, size, swiotlb_addr, dma_handle, attrs);
}

static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,
				     unsigned long offset, size_t size,
				     enum dma_data_direction dir,
				     struct dma_attrs *attrs)
{
	dma_addr_t dev_addr;

	dev_addr = swiotlb_map_page(dev, page, offset, size, dir, attrs);
	__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);

	return dev_addr;
}


static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
				 size_t size, enum dma_data_direction dir,
				 struct dma_attrs *attrs)
{
	__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
	swiotlb_unmap_page(dev, dev_addr, size, dir, attrs);
}

static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
				  int nelems, enum dma_data_direction dir,
				  struct dma_attrs *attrs)
{
	struct scatterlist *sg;
	int i, ret;

	ret = swiotlb_map_sg_attrs(dev, sgl, nelems, dir, attrs);
	for_each_sg(sgl, sg, ret, i)
		__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
			       sg->length, dir);

	return ret;
}

static void __swiotlb_unmap_sg_attrs(struct device *dev,
				     struct scatterlist *sgl, int nelems,
				     enum dma_data_direction dir,
				     struct dma_attrs *attrs)
{
	struct scatterlist *sg;
	int i;

	for_each_sg(sgl, sg, nelems, i)
		__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
				 sg->length, dir);
	swiotlb_unmap_sg_attrs(dev, sgl, nelems, dir, attrs);
}

static void __swiotlb_sync_single_for_cpu(struct device *dev,
					  dma_addr_t dev_addr, size_t size,
					  enum dma_data_direction dir)
{
	__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
	swiotlb_sync_single_for_cpu(dev, dev_addr, size, dir);
}

static void __swiotlb_sync_single_for_device(struct device *dev,
					     dma_addr_t dev_addr, size_t size,
					     enum dma_data_direction dir)
{
	swiotlb_sync_single_for_device(dev, dev_addr, size, dir);
	__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
}

static void __swiotlb_sync_sg_for_cpu(struct device *dev,
				      struct scatterlist *sgl, int nelems,
				      enum dma_data_direction dir)
{
	struct scatterlist *sg;
	int i;

	for_each_sg(sgl, sg, nelems, i)
		__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
				 sg->length, dir);
	swiotlb_sync_sg_for_cpu(dev, sgl, nelems, dir);
}

static void __swiotlb_sync_sg_for_device(struct device *dev,
					 struct scatterlist *sgl, int nelems,
					 enum dma_data_direction dir)
{
	struct scatterlist *sg;
	int i;

	swiotlb_sync_sg_for_device(dev, sgl, nelems, dir);
	for_each_sg(sgl, sg, nelems, i)
		__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
			       sg->length, dir);
}

/* vma->vm_page_prot must be set appropriately before calling this function */
static int __dma_common_mmap(struct device *dev, struct vm_area_struct *vma,
			     void *cpu_addr, dma_addr_t dma_addr, size_t size)
{
	int ret = -ENXIO;
	unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >>
					PAGE_SHIFT;
	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
	unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT;
	unsigned long off = vma->vm_pgoff;

	if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
		return ret;

	if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
		ret = remap_pfn_range(vma, vma->vm_start,
				      pfn + off,
				      vma->vm_end - vma->vm_start,
				      vma->vm_page_prot);
	}

	return ret;
}

static int __swiotlb_mmap_noncoherent(struct device *dev,
		struct vm_area_struct *vma,
		void *cpu_addr, dma_addr_t dma_addr, size_t size,
		struct dma_attrs *attrs)
{
	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot, false);
	return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}

static int __swiotlb_mmap_coherent(struct device *dev,
		struct vm_area_struct *vma,
		void *cpu_addr, dma_addr_t dma_addr, size_t size,
		struct dma_attrs *attrs)
{
	/* Just use whatever page_prot attributes were specified */
	return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
}

struct dma_map_ops noncoherent_swiotlb_dma_ops = {
	.alloc = __dma_alloc_noncoherent,
	.free = __dma_free_noncoherent,
	.mmap = __swiotlb_mmap_noncoherent,
	.map_page = __swiotlb_map_page,
	.unmap_page = __swiotlb_unmap_page,
	.map_sg = __swiotlb_map_sg_attrs,
	.unmap_sg = __swiotlb_unmap_sg_attrs,
	.sync_single_for_cpu = __swiotlb_sync_single_for_cpu,
	.sync_single_for_device = __swiotlb_sync_single_for_device,
	.sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu,
	.sync_sg_for_device = __swiotlb_sync_sg_for_device,
	.dma_supported = swiotlb_dma_supported,
	.mapping_error = swiotlb_dma_mapping_error,
};
EXPORT_SYMBOL(noncoherent_swiotlb_dma_ops);

struct dma_map_ops coherent_swiotlb_dma_ops = {
	.alloc = __dma_alloc_coherent,
	.free = __dma_free_coherent,
	.mmap = __swiotlb_mmap_coherent,
	.map_page = swiotlb_map_page,
	.unmap_page = swiotlb_unmap_page,
	.map_sg = swiotlb_map_sg_attrs,
	.unmap_sg = swiotlb_unmap_sg_attrs,
	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
	.sync_single_for_device = swiotlb_sync_single_for_device,
	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
	.sync_sg_for_device = swiotlb_sync_sg_for_device,
	.dma_supported = swiotlb_dma_supported,
	.mapping_error = swiotlb_dma_mapping_error,
};
EXPORT_SYMBOL(coherent_swiotlb_dma_ops);

extern int swiotlb_late_init_with_default_size(size_t default_size);

static int __init swiotlb_late_init(void)
{
	size_t swiotlb_size = min(SZ_64M, MAX_ORDER_NR_PAGES << PAGE_SHIFT);

	dma_ops = &coherent_swiotlb_dma_ops;

	return swiotlb_late_init_with_default_size(swiotlb_size);
}
subsys_initcall(swiotlb_late_init);

#define PREALLOC_DMA_DEBUG_ENTRIES	4096

static int __init dma_debug_do_init(void)
{
	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
	return 0;
}
fs_initcall(dma_debug_do_init);
Commit	Line	Data
09b55412 CM	1	/*
	2	* SWIOTLB-based DMA API implementation
	3	*
	4	* Copyright (C) 2012 ARM Ltd.
	5	* Author: Catalin Marinas <catalin.marinas@arm.com>
	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/gfp.h>
	21	#include <linux/export.h>
	22	#include <linux/slab.h>
	23	#include <linux/dma-mapping.h>
6ac2104d	24	#include <linux/dma-contiguous.h>
09b55412 CM	25	#include <linux/vmalloc.h>
	26	#include <linux/swiotlb.h>
	27
	28	#include <asm/cacheflush.h>
	29
	30	struct dma_map_ops *dma_ops;
	31	EXPORT_SYMBOL(dma_ops);
	32
214fdbe7 LA	33	static pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot,
	34	bool coherent)
	35	{
196adf2f	36	if (!coherent \|\| dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs))
214fdbe7	37	return pgprot_writecombine(prot);
214fdbe7 LA	38	return prot;
	39	}
	40
bb10eb7b RH	41	static void __dma_alloc_coherent(struct device dev, size_t size,
	42	dma_addr_t *dma_handle, gfp_t flags,
	43	struct dma_attrs *attrs)
09b55412	44	{
c666e8d5 LA	45	if (dev == NULL) {
	46	WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
	47	return NULL;
	48	}
	49
19e7640d	50	if (IS_ENABLED(CONFIG_ZONE_DMA) &&
09b55412	51	dev->coherent_dma_mask <= DMA_BIT_MASK(32))
19e7640d	52	flags \|= GFP_DMA;
6ac2104d LA	53	if (IS_ENABLED(CONFIG_DMA_CMA)) {
	54	struct page *page;
	55
ccc9e244	56	size = PAGE_ALIGN(size);
6ac2104d LA	57	page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
	58	get_order(size));
	59	if (!page)
	60	return NULL;
	61
	62	*dma_handle = phys_to_dma(dev, page_to_phys(page));
	63	return page_address(page);
	64	} else {
	65	return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
	66	}
09b55412 CM	67	}
09b55412 CM	68
bb10eb7b RH	69	static void __dma_free_coherent(struct device *dev, size_t size,
	70	void *vaddr, dma_addr_t dma_handle,
	71	struct dma_attrs *attrs)
09b55412	72	{
c666e8d5 LA	73	if (dev == NULL) {
	74	WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
	75	return;
	76	}
	77
6ac2104d LA	78	if (IS_ENABLED(CONFIG_DMA_CMA)) {
	79	phys_addr_t paddr = dma_to_phys(dev, dma_handle);
	80
	81	dma_release_from_contiguous(dev,
	82	phys_to_page(paddr),
	83	size >> PAGE_SHIFT);
	84	} else {
	85	swiotlb_free_coherent(dev, size, vaddr, dma_handle);
	86	}
09b55412 CM	87	}
09b55412 CM	88
7363590d CM	89	static void __dma_alloc_noncoherent(struct device dev, size_t size,
	90	dma_addr_t *dma_handle, gfp_t flags,
	91	struct dma_attrs *attrs)
	92	{
	93	struct page page, *map;
	94	void ptr, coherent_ptr;
	95	int order, i;
	96
	97	size = PAGE_ALIGN(size);
	98	order = get_order(size);
	99
	100	ptr = __dma_alloc_coherent(dev, size, dma_handle, flags, attrs);
	101	if (!ptr)
	102	goto no_mem;
	103	map = kmalloc(sizeof(struct page *) << order, flags & ~GFP_DMA);
	104	if (!map)
	105	goto no_map;
	106
	107	/* remove any dirty cache lines on the kernel alias */
	108	__dma_flush_range(ptr, ptr + size);
	109
	110	/* create a coherent mapping */
	111	page = virt_to_page(ptr);
	112	for (i = 0; i < (size >> PAGE_SHIFT); i++)
	113	map[i] = page + i;
	114	coherent_ptr = vmap(map, size >> PAGE_SHIFT, VM_MAP,
214fdbe7	115	__get_dma_pgprot(attrs, pgprot_default, false));
7363590d CM	116	kfree(map);
	117	if (!coherent_ptr)
	118	goto no_map;
	119
	120	return coherent_ptr;
	121
	122	no_map:
	123	__dma_free_coherent(dev, size, ptr, *dma_handle, attrs);
	124	no_mem:
	125	*dma_handle = ~0;
	126	return NULL;
	127	}
	128
	129	static void __dma_free_noncoherent(struct device *dev, size_t size,
	130	void *vaddr, dma_addr_t dma_handle,
	131	struct dma_attrs *attrs)
	132	{
	133	void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
	134
	135	vunmap(vaddr);
	136	__dma_free_coherent(dev, size, swiotlb_addr, dma_handle, attrs);
	137	}
	138
	139	static dma_addr_t __swiotlb_map_page(struct device dev, struct page page,
	140	unsigned long offset, size_t size,
	141	enum dma_data_direction dir,
	142	struct dma_attrs *attrs)
	143	{
	144	dma_addr_t dev_addr;
	145
	146	dev_addr = swiotlb_map_page(dev, page, offset, size, dir, attrs);
	147	__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
	148
	149	return dev_addr;
	150	}
	151
	152
	153	static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
	154	size_t size, enum dma_data_direction dir,
	155	struct dma_attrs *attrs)
	156	{
	157	__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
	158	swiotlb_unmap_page(dev, dev_addr, size, dir, attrs);
	159	}
	160
	161	static int __swiotlb_map_sg_attrs(struct device dev, struct scatterlist sgl,
	162	int nelems, enum dma_data_direction dir,
	163	struct dma_attrs *attrs)
	164	{
	165	struct scatterlist *sg;
	166	int i, ret;
	167
	168	ret = swiotlb_map_sg_attrs(dev, sgl, nelems, dir, attrs);
	169	for_each_sg(sgl, sg, ret, i)
	170	__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
	171	sg->length, dir);
	172
	173	return ret;
	174	}
	175
	176	static void __swiotlb_unmap_sg_attrs(struct device *dev,
	177	struct scatterlist *sgl, int nelems,
	178	enum dma_data_direction dir,
	179	struct dma_attrs *attrs)
180	{
181	struct scatterlist *sg;
182	int i;
183
184	for_each_sg(sgl, sg, nelems, i)
185	__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
186	sg->length, dir);
187	swiotlb_unmap_sg_attrs(dev, sgl, nelems, dir, attrs);
188	}
189
190	static void __swiotlb_sync_single_for_cpu(struct device *dev,
191	dma_addr_t dev_addr, size_t size,
192	enum dma_data_direction dir)
193	{
194	__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
195	swiotlb_sync_single_for_cpu(dev, dev_addr, size, dir);
196	}
197
198	static void __swiotlb_sync_single_for_device(struct device *dev,
199	dma_addr_t dev_addr, size_t size,
200	enum dma_data_direction dir)
201	{
202	swiotlb_sync_single_for_device(dev, dev_addr, size, dir);
203	__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
204	}
205
206	static void __swiotlb_sync_sg_for_cpu(struct device *dev,
207	struct scatterlist *sgl, int nelems,
208	enum dma_data_direction dir)
209	{
210	struct scatterlist *sg;
211	int i;
212
213	for_each_sg(sgl, sg, nelems, i)
214	__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
215	sg->length, dir);
216	swiotlb_sync_sg_for_cpu(dev, sgl, nelems, dir);
217	}
218
219	static void __swiotlb_sync_sg_for_device(struct device *dev,
220	struct scatterlist *sgl, int nelems,
221	enum dma_data_direction dir)
222	{
223	struct scatterlist *sg;
224	int i;
225
226	swiotlb_sync_sg_for_device(dev, sgl, nelems, dir);
227	for_each_sg(sgl, sg, nelems, i)
228	__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
229	sg->length, dir);
230	}
231
6e8d7968 LA	232	/* vma->vm_page_prot must be set appropriately before calling this function */
	233	static int __dma_common_mmap(struct device dev, struct vm_area_struct vma,
	234	void *cpu_addr, dma_addr_t dma_addr, size_t size)
	235	{
	236	int ret = -ENXIO;
	237	unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >>
	238	PAGE_SHIFT;
	239	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
	240	unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT;
	241	unsigned long off = vma->vm_pgoff;
	242
	243	if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
	244	return ret;
	245
	246	if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
	247	ret = remap_pfn_range(vma, vma->vm_start,
	248	pfn + off,
	249	vma->vm_end - vma->vm_start,
	250	vma->vm_page_prot);
	251	}
	252
	253	return ret;
	254	}
	255
	256	static int __swiotlb_mmap_noncoherent(struct device *dev,
	257	struct vm_area_struct *vma,
	258	void *cpu_addr, dma_addr_t dma_addr, size_t size,
	259	struct dma_attrs *attrs)
	260	{
214fdbe7	261	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot, false);
6e8d7968 LA	262	return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
	263	}
	264
	265	static int __swiotlb_mmap_coherent(struct device *dev,
	266	struct vm_area_struct *vma,
	267	void *cpu_addr, dma_addr_t dma_addr, size_t size,
	268	struct dma_attrs *attrs)
	269	{
	270	/* Just use whatever page_prot attributes were specified */
	271	return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);
	272	}
	273
7363590d CM	274	struct dma_map_ops noncoherent_swiotlb_dma_ops = {
	275	.alloc = __dma_alloc_noncoherent,
	276	.free = __dma_free_noncoherent,
6e8d7968	277	.mmap = __swiotlb_mmap_noncoherent,
7363590d CM	278	.map_page = __swiotlb_map_page,
	279	.unmap_page = __swiotlb_unmap_page,
	280	.map_sg = __swiotlb_map_sg_attrs,
	281	.unmap_sg = __swiotlb_unmap_sg_attrs,
	282	.sync_single_for_cpu = __swiotlb_sync_single_for_cpu,
	283	.sync_single_for_device = __swiotlb_sync_single_for_device,
	284	.sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu,
	285	.sync_sg_for_device = __swiotlb_sync_sg_for_device,
	286	.dma_supported = swiotlb_dma_supported,
	287	.mapping_error = swiotlb_dma_mapping_error,
	288	};
	289	EXPORT_SYMBOL(noncoherent_swiotlb_dma_ops);
	290
	291	struct dma_map_ops coherent_swiotlb_dma_ops = {
bb10eb7b RH	292	.alloc = __dma_alloc_coherent,
bb10eb7b RH	293	.free = __dma_free_coherent,
6e8d7968	294	.mmap = __swiotlb_mmap_coherent,
09b55412 CM	295	.map_page = swiotlb_map_page,
	296	.unmap_page = swiotlb_unmap_page,
	297	.map_sg = swiotlb_map_sg_attrs,
	298	.unmap_sg = swiotlb_unmap_sg_attrs,
	299	.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
	300	.sync_single_for_device = swiotlb_sync_single_for_device,
	301	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
	302	.sync_sg_for_device = swiotlb_sync_sg_for_device,
	303	.dma_supported = swiotlb_dma_supported,
	304	.mapping_error = swiotlb_dma_mapping_error,
	305	};
7363590d	306	EXPORT_SYMBOL(coherent_swiotlb_dma_ops);
09b55412	307
3690951f CM	308	extern int swiotlb_late_init_with_default_size(size_t default_size);
	309
	310	static int __init swiotlb_late_init(void)
09b55412	311	{
3690951f CM	312	size_t swiotlb_size = min(SZ_64M, MAX_ORDER_NR_PAGES << PAGE_SHIFT);
3690951f CM	313
bb10eb7b	314	dma_ops = &coherent_swiotlb_dma_ops;
3690951f CM	315
3690951f CM	316	return swiotlb_late_init_with_default_size(swiotlb_size);
09b55412	317	}
3690951f	318	subsys_initcall(swiotlb_late_init);
09b55412 CM	319
	320	#define PREALLOC_DMA_DEBUG_ENTRIES 4096
	321
	322	static int __init dma_debug_do_init(void)
	323	{
	324	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
	325	return 0;
	326	}
	327	fs_initcall(dma_debug_do_init);