Release 4.14 arch/mips/mm/dma-default.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) 2000  Ani Joshi <ajoshi@unixbox.com>
 * Copyright (C) 2000, 2001, 06  Ralf Baechle <ralf@linux-mips.org>
 * swiped from i386, and cloned for MIPS by Geert, polished by Ralf.
 */

#include <linux/types.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/scatterlist.h>
#include <linux/string.h>
#include <linux/gfp.h>
#include <linux/highmem.h>
#include <linux/dma-contiguous.h>

#include <asm/cache.h>
#include <asm/cpu-type.h>
#include <asm/io.h>

#include <dma-coherence.h>

#if defined(CONFIG_DMA_MAYBE_COHERENT) && !defined(CONFIG_DMA_PERDEV_COHERENT)
/* User defined DMA coherency from command line. */

enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;

EXPORT_SYMBOL_GPL(coherentio);

int hw_coherentio = 0;	
/* Actual hardware supported DMA coherency setting. */



static int __init setcoherentio(char *str)
{
	coherentio = IO_COHERENCE_ENABLED;
	pr_info("Hardware DMA cache coherency (command line)\n");
	return 0;
}
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Steven J. Hill
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Paul Burton
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early_param("coherentio", setcoherentio);



static int __init setnocoherentio(char *str)
{
	coherentio = IO_COHERENCE_DISABLED;
	pr_info("Software DMA cache coherency (command line)\n");
	return 0;
}
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Steven J. Hill
22
95.65%
1
50.00%
Paul Burton
1
4.35%
1
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23
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2
100.00%

early_param("nocoherentio", setnocoherentio);
#endif



static inline struct page *dma_addr_to_page(struct device *dev,
	dma_addr_t dma_addr)
{
	return pfn_to_page(
		plat_dma_addr_to_phys(dev, dma_addr) >> PAGE_SHIFT);
}

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Franck Bui-Huu
14
46.67%
1
33.33%
Dezhong Diao
9
30.00%
1
33.33%
Kevin Cernekee
7
23.33%
1
33.33%
Total
30
100.00%
3
100.00%

/*
 * The affected CPUs below in 'cpu_needs_post_dma_flush()' can
 * speculatively fill random cachelines with stale data at any time,
 * requiring an extra flush post-DMA.
 *
 * Warning on the terminology - Linux calls an uncached area coherent;
 * MIPS terminology calls memory areas with hardware maintained coherency
 * coherent.
 *
 * Note that the R14000 and R16000 should also be checked for in this
 * condition.  However this function is only called on non-I/O-coherent
 * systems and only the R10000 and R12000 are used in such systems, the
 * SGI IP28 Indigo² rsp. SGI IP32 aka O2.
 */


static inline bool cpu_needs_post_dma_flush(struct device *dev)
{
	if (plat_device_is_coherent(dev))
		return false;

	switch (boot_cpu_type()) {
	case CPU_R10000:
	case CPU_R12000:
	case CPU_BMIPS5000:
		return true;

	default:
		/*
                 * Presence of MAARs suggests that the CPU supports
                 * speculatively prefetching data, and therefore requires
                 * the post-DMA flush/invalidate.
                 */
		return cpu_has_maar;
	}
}

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Paul Burton
25
54.35%
1
20.00%
Ralf Bächle
18
39.13%
2
40.00%
Jim Quinlan
2
4.35%
1
20.00%
Jerin Jacob
1
2.17%
1
20.00%
Total
46
100.00%
5
100.00%



static gfp_t massage_gfp_flags(const struct device *dev, gfp_t gfp)
{
	gfp_t dma_flag;

	/* ignore region specifiers */
	gfp &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM);

#ifdef CONFIG_ISA
	if (dev == NULL)
		dma_flag = __GFP_DMA;
	else
#endif
#if defined(CONFIG_ZONE_DMA32) && defined(CONFIG_ZONE_DMA)
	     if (dev == NULL || dev->coherent_dma_mask < DMA_BIT_MASK(32))
			dma_flag = __GFP_DMA;
	else if (dev->coherent_dma_mask < DMA_BIT_MASK(64))
			dma_flag = __GFP_DMA32;
	else
#endif
#if defined(CONFIG_ZONE_DMA32) && !defined(CONFIG_ZONE_DMA)
	     if (dev == NULL || dev->coherent_dma_mask < DMA_BIT_MASK(64))
		dma_flag = __GFP_DMA32;
	else
#endif
#if defined(CONFIG_ZONE_DMA) && !defined(CONFIG_ZONE_DMA32)
	     if (dev == NULL ||
		 dev->coherent_dma_mask < DMA_BIT_MASK(sizeof(phys_addr_t) * 8))
		dma_flag = __GFP_DMA;
	else
#endif
		dma_flag = 0;

	/* Don't invoke OOM killer */
	gfp |= __GFP_NORETRY;

	return gfp | dma_flag;
}

Contributors
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CommitProp
Ralf Bächle
134
73.63%
2
28.57%
Andrew Morton
29
15.93%
2
28.57%
Matt Redfearn
12
6.59%
1
14.29%
James Hogan
6
3.30%
1
14.29%
Al Viro
1
0.55%
1
14.29%
Total
182
100.00%
7
100.00%



static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
	dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
	void *ret;
	struct page *page = NULL;
	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;

	gfp = massage_gfp_flags(dev, gfp);

	if (IS_ENABLED(CONFIG_DMA_CMA) && gfpflags_allow_blocking(gfp))
		page = dma_alloc_from_contiguous(dev, count, get_order(size),
						 gfp);
	if (!page)
		page = alloc_pages(gfp, get_order(size));

	if (!page)
		return NULL;

	ret = page_address(page);
	memset(ret, 0, size);
	*dma_handle = plat_map_dma_mem(dev, ret, size);
	if (!(attrs & DMA_ATTR_NON_CONSISTENT) &&
	    !plat_device_is_coherent(dev)) {
		dma_cache_wback_inv((unsigned long) ret, size);
		ret = UNCAC_ADDR(ret);
	}

	return ret;
}

Contributors
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Zubair Lutfullah Kakakhel
61
34.66%
1
9.09%
Andrew Morton
57
32.39%
1
9.09%
Ralf Bächle
39
22.16%
2
18.18%
Christoph Hellwig
7
3.98%
1
9.09%
Qais Yousef
3
1.70%
1
9.09%
David Daney
2
1.14%
1
9.09%
Lucas Stach
2
1.14%
1
9.09%
Krzysztof Kozlowski
2
1.14%
1
9.09%
Andrzej Pietrasiewicz
2
1.14%
1
9.09%
Al Viro
1
0.57%
1
9.09%
Total
176
100.00%
11
100.00%



static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
	dma_addr_t dma_handle, unsigned long attrs)
{
	unsigned long addr = (unsigned long) vaddr;
	unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
	struct page *page = NULL;

	plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);

	if (!(attrs & DMA_ATTR_NON_CONSISTENT) && !plat_device_is_coherent(dev))
		addr = CAC_ADDR(addr);

	page = virt_to_page((void *) addr);

	if (!dma_release_from_contiguous(dev, page, count))
		__free_pages(page, get_order(size));
}

Contributors
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Andrew Morton
45
37.82%
1
10.00%
Zubair Lutfullah Kakakhel
42
35.29%
1
10.00%
David Daney
9
7.56%
3
30.00%
Ralf Bächle
8
6.72%
1
10.00%
Christoph Hellwig
7
5.88%
1
10.00%
Kevin Cernekee
4
3.36%
1
10.00%
Andrzej Pietrasiewicz
2
1.68%
1
10.00%
Krzysztof Kozlowski
2
1.68%
1
10.00%
Total
119
100.00%
10
100.00%



static int mips_dma_mmap(struct device *dev, struct vm_area_struct *vma,
	void *cpu_addr, dma_addr_t dma_addr, size_t size,
	unsigned long attrs)
{
	unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT;
	unsigned long addr = (unsigned long)cpu_addr;
	unsigned long off = vma->vm_pgoff;
	unsigned long pfn;
	int ret = -ENXIO;

	if (!plat_device_is_coherent(dev))
		addr = CAC_ADDR(addr);

	pfn = page_to_pfn(virt_to_page((void *)addr));

	if (attrs & DMA_ATTR_WRITE_COMBINE)
		vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
	else
		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);

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

	if (off < count && user_count <= (count - off)) {
		ret = remap_pfn_range(vma, vma->vm_start,
				      pfn + off,
				      user_count << PAGE_SHIFT,
				      vma->vm_page_prot);
	}

	return ret;
}

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Alex Smith
199
97.55%
1
33.33%
Krzysztof Kozlowski
4
1.96%
1
33.33%
Vladimir Murzin
1
0.49%
1
33.33%
Total
204
100.00%
3
100.00%



static inline void __dma_sync_virtual(void *addr, size_t size,
	enum dma_data_direction direction)
{
	switch (direction) {
	case DMA_TO_DEVICE:
		dma_cache_wback((unsigned long)addr, size);
		break;

	case DMA_FROM_DEVICE:
		dma_cache_inv((unsigned long)addr, size);
		break;

	case DMA_BIDIRECTIONAL:
		dma_cache_wback_inv((unsigned long)addr, size);
		break;

	default:
		BUG();
	}
}

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Andrew Morton
58
79.45%
1
50.00%
Dezhong Diao
15
20.55%
1
50.00%
Total
73
100.00%
2
100.00%

/*
 * A single sg entry may refer to multiple physically contiguous
 * pages. But we still need to process highmem pages individually.
 * If highmem is not configured then the bulk of this loop gets
 * optimized out.
 */


static inline void __dma_sync(struct page *page,
	unsigned long offset, size_t size, enum dma_data_direction direction)
{
	size_t left = size;

	do {
		size_t len = left;

		if (PageHighMem(page)) {
			void *addr;

			if (offset + len > PAGE_SIZE) {
				if (offset >= PAGE_SIZE) {
					page += offset >> PAGE_SHIFT;
					offset &= ~PAGE_MASK;
				}
				len = PAGE_SIZE - offset;
			}

			addr = kmap_atomic(page);
			__dma_sync_virtual(addr + offset, len, direction);
			kunmap_atomic(addr);
		} else
			__dma_sync_virtual(page_address(page) + offset,
					   size, direction);
		offset = 0;
		page++;
		left -= len;
	} while (left);
}

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Dezhong Diao
138
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1
100.00%
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138
100.00%
1
100.00%



static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
	size_t size, enum dma_data_direction direction, unsigned long attrs)
{
	if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
		__dma_sync(dma_addr_to_page(dev, dma_addr),
			   dma_addr & ~PAGE_MASK, size, direction);
	plat_post_dma_flush(dev);
	plat_unmap_dma_mem(dev, dma_addr, size, direction);
}

Contributors
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CommitProp
Ralf Bächle
25
33.78%
2
18.18%
Andrew Morton
21
28.38%
1
9.09%
Alexander Duyck
7
9.46%
1
9.09%
Kevin Cernekee
6
8.11%
2
18.18%
Dezhong Diao
6
8.11%
1
9.09%
David Daney
6
8.11%
2
18.18%
Krzysztof Kozlowski
2
2.70%
1
9.09%
Jim Quinlan
1
1.35%
1
9.09%
Total
74
100.00%
11
100.00%



static int mips_dma_map_sg(struct device *dev, struct scatterlist *sglist,
	int nents, enum dma_data_direction direction, unsigned long attrs)
{
	int i;
	struct scatterlist *sg;

	for_each_sg(sglist, sg, nents, i) {
		if (!plat_device_is_coherent(dev) &&
		    !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
			__dma_sync(sg_page(sg), sg->offset, sg->length,
				   direction);
#ifdef CONFIG_NEED_SG_DMA_LENGTH
		sg->dma_length = sg->length;
#endif
		sg->dma_address = plat_map_dma_mem_page(dev, sg_page(sg)) +
				  sg->offset;
	}

	return nents;
}

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Andrew Morton
48
42.11%
1
11.11%
Dezhong Diao
16
14.04%
1
11.11%
Akinobu Mita
15
13.16%
1
11.11%
Jayachandran C
13
11.40%
1
11.11%
Alexander Duyck
7
6.14%
1
11.11%
Ralf Bächle
7
6.14%
1
11.11%
David Daney
4
3.51%
1
11.11%
Krzysztof Kozlowski
2
1.75%
1
11.11%
Thomas Bogendoerfer
2
1.75%
1
11.11%
Total
114
100.00%
9
100.00%



static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page,
	unsigned long offset, size_t size, enum dma_data_direction direction,
	unsigned long attrs)
{
	if (!plat_device_is_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
		__dma_sync(page, offset, size, direction);

	return plat_map_dma_mem_page(dev, page) + offset;
}

Contributors
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CommitProp
Andrew Morton
34
50.75%
1
14.29%
David Daney
12
17.91%
1
14.29%
Dezhong Diao
7
10.45%
1
14.29%
Alexander Duyck
7
10.45%
1
14.29%
Atsushi Nemoto
3
4.48%
1
14.29%
Ralf Bächle
2
2.99%
1
14.29%
Krzysztof Kozlowski
2
2.99%
1
14.29%
Total
67
100.00%
7
100.00%



static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
	int nhwentries, enum dma_data_direction direction,
	unsigned long attrs)
{
	int i;
	struct scatterlist *sg;

	for_each_sg(sglist, sg, nhwentries, i) {
		if (!plat_device_is_coherent(dev) &&
		    !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
		    direction != DMA_TO_DEVICE)
			__dma_sync(sg_page(sg), sg->offset, sg->length,
				   direction);
		plat_unmap_dma_mem(dev, sg->dma_address, sg->length, direction);
	}
}

Contributors
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Tokens
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CommitProp
Andrew Morton
34
34.34%
1
10.00%
Ralf Bächle
20
20.20%
1
10.00%
Akinobu Mita
15
15.15%
1
10.00%
Dezhong Diao
7
7.07%
1
10.00%
Alexander Duyck
7
7.07%
1
10.00%
Kevin Cernekee
6
6.06%
1
10.00%
David Daney
6
6.06%
2
20.00%
Thiemo Seufer
2
2.02%
1
10.00%
Krzysztof Kozlowski
2
2.02%
1
10.00%
Total
99
100.00%
10
100.00%



static void mips_dma_sync_single_for_cpu(struct device *dev,
	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
{
	if (cpu_needs_post_dma_flush(dev))
		__dma_sync(dma_addr_to_page(dev, dma_handle),
			   dma_handle & ~PAGE_MASK, size, direction);
	plat_post_dma_flush(dev);
}

Contributors
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CommitProp
Andrew Morton
25
48.08%
2
25.00%
Ralf Bächle
14
26.92%
2
25.00%
Dezhong Diao
8
15.38%
1
12.50%
David Daney
2
3.85%
1
12.50%
Kevin Cernekee
2
3.85%
1
12.50%
Jim Quinlan
1
1.92%
1
12.50%
Total
52
100.00%
8
100.00%



static void mips_dma_sync_single_for_device(struct device *dev,
	dma_addr_t dma_handle, size_t size, enum dma_data_direction direction)
{
	if (!plat_device_is_coherent(dev))
		__dma_sync(dma_addr_to_page(dev, dma_handle),
			   dma_handle & ~PAGE_MASK, size, direction);
}

Contributors
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CommitProp
Andrew Morton
25
52.08%
1
16.67%
Ralf Bächle
9
18.75%
1
16.67%
Dezhong Diao
8
16.67%
1
16.67%
David Daney
2
4.17%
1
16.67%
Kevin Cernekee
2
4.17%
1
16.67%
Thomas Bogendoerfer
2
4.17%
1
16.67%
Total
48
100.00%
6
100.00%



static void mips_dma_sync_sg_for_cpu(struct device *dev,
	struct scatterlist *sglist, int nelems,
	enum dma_data_direction direction)
{
	int i;
	struct scatterlist *sg;

	if (cpu_needs_post_dma_flush(dev)) {
		for_each_sg(sglist, sg, nelems, i) {
			__dma_sync(sg_page(sg), sg->offset, sg->length,
				   direction);
		}
	}
	plat_post_dma_flush(dev);
}

Contributors
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Tokens
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CommitProp
Andrew Morton
33
44.00%
1
12.50%
Akinobu Mita
20
26.67%
1
12.50%
Jayachandran C
7
9.33%
1
12.50%
Ralf Bächle
6
8.00%
2
25.00%
Dezhong Diao
4
5.33%
1
12.50%
Jens Axboe
3
4.00%
1
12.50%
David Daney
2
2.67%
1
12.50%
Total
75
100.00%
8
100.00%



static void mips_dma_sync_sg_for_device(struct device *dev,
	struct scatterlist *sglist, int nelems,
	enum dma_data_direction direction)
{
	int i;
	struct scatterlist *sg;

	if (!plat_device_is_coherent(dev)) {
		for_each_sg(sglist, sg, nelems, i) {
			__dma_sync(sg_page(sg), sg->offset, sg->length,
				   direction);
		}
	}
}

Contributors
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Tokens
Prop
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CommitProp
Andrew Morton
33
46.48%
1
14.29%
Akinobu Mita
20
28.17%
1
14.29%
Jayachandran C
8
11.27%
1
14.29%
Dezhong Diao
4
5.63%
1
14.29%
Jens Axboe
3
4.23%
1
14.29%
David Daney
2
2.82%
1
14.29%
Ralf Bächle
1
1.41%
1
14.29%
Total
71
100.00%
7
100.00%



static int mips_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
{
	return 0;
}

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Andrew Morton
9
52.94%
1
20.00%
FUJITA Tomonori
5
29.41%
1
20.00%
Paul Burton
1
5.88%
1
20.00%
David Daney
1
5.88%
1
20.00%
Felix Fietkau
1
5.88%
1
20.00%
Total
17
100.00%
5
100.00%



static int mips_dma_supported(struct device *dev, u64 mask)
{
	return plat_dma_supported(dev, mask);
}

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Andrew Morton
13
59.09%
1
20.00%
David Daney
6
27.27%
2
40.00%
Ralf Bächle
2
9.09%
1
20.00%
Paul Burton
1
4.55%
1
20.00%
Total
22
100.00%
5
100.00%



void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
			 enum dma_data_direction direction)
{
	BUG_ON(direction == DMA_NONE);

	if (!plat_device_is_coherent(dev))
		__dma_sync_virtual(vaddr, size, direction);
}

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CommitProp
Andrew Morton
25
55.56%
1
16.67%
Ralf Bächle
17
37.78%
3
50.00%
Thomas Bogendoerfer
2
4.44%
1
16.67%
Dezhong Diao
1
2.22%
1
16.67%
Total
45
100.00%
6
100.00%


EXPORT_SYMBOL(dma_cache_sync);


static const struct dma_map_ops mips_default_dma_map_ops = {
	.alloc = mips_dma_alloc_coherent,
	.free = mips_dma_free_coherent,
	.mmap = mips_dma_mmap,
	.map_page = mips_dma_map_page,
	.unmap_page = mips_dma_unmap_page,
	.map_sg = mips_dma_map_sg,
	.unmap_sg = mips_dma_unmap_sg,
	.sync_single_for_cpu = mips_dma_sync_single_for_cpu,
	.sync_single_for_device = mips_dma_sync_single_for_device,
	.sync_sg_for_cpu = mips_dma_sync_sg_for_cpu,
	.sync_sg_for_device = mips_dma_sync_sg_for_device,
	.mapping_error = mips_dma_mapping_error,
	.dma_supported = mips_dma_supported
};


const struct dma_map_ops *mips_dma_map_ops = &mips_default_dma_map_ops;

EXPORT_SYMBOL(mips_dma_map_ops);


#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)



static int __init mips_dma_init(void)
{
	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Daney
17
100.00%
1
100.00%
Total
17
100.00%
1
100.00%


fs_initcall(mips_dma_init);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Andrew Morton
509
26.73%
3
5.36%
Ralf Bächle
320
16.81%
11
19.64%
Dezhong Diao
227
11.92%
1
1.79%
Alex Smith
204
10.71%
1
1.79%
David Daney
154
8.09%
3
5.36%
Zubair Lutfullah Kakakhel
106
5.57%
1
1.79%
Steven J. Hill
72
3.78%
1
1.79%
Akinobu Mita
70
3.68%
1
1.79%
Paul Burton
44
2.31%
4
7.14%
Alexander Duyck
28
1.47%
1
1.79%
Jayachandran C
28
1.47%
2
3.57%
Kevin Cernekee
27
1.42%
2
3.57%
Krzysztof Kozlowski
16
0.84%
1
1.79%
Franck Bui-Huu
14
0.74%
1
1.79%
Christoph Hellwig
14
0.74%
1
1.79%
Matt Redfearn
12
0.63%
1
1.79%
Jens Axboe
8
0.42%
2
3.57%
Thomas Bogendoerfer
6
0.32%
3
5.36%
Andrzej Pietrasiewicz
6
0.32%
1
1.79%
James Hogan
6
0.32%
1
1.79%
FUJITA Tomonori
5
0.26%
1
1.79%
Jim Quinlan
4
0.21%
1
1.79%
Felix Fietkau
4
0.21%
2
3.57%
Tejun Heo
3
0.16%
1
1.79%
Atsushi Nemoto
3
0.16%
1
1.79%
Qais Yousef
3
0.16%
1
1.79%
Al Viro
2
0.11%
1
1.79%
Lucas Stach
2
0.11%
1
1.79%
Thiemo Seufer
2
0.11%
1
1.79%
Bart Van Assche
2
0.11%
1
1.79%
Jerin Jacob
1
0.05%
1
1.79%
Paul Gortmaker
1
0.05%
1
1.79%
Vladimir Murzin
1
0.05%
1
1.79%
Total
1904
100.00%
56
100.00%
Directory: arch/mips/mm

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