summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/dma-iommu.c
blob: e486d1d78de28842b8a35af69880bbb12ce86cf8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corporation
 *
 * Provide default implementations of the DMA mapping callbacks for
 * busses using the iommu infrastructure
 */

#include <linux/dma-direct.h>
#include <linux/pci.h>
#include <asm/iommu.h>

/*
 * Generic iommu implementation
 */

/*
 * The coherent mask may be smaller than the real mask, check if we can
 * really use a direct window.
 */
static inline bool dma_iommu_alloc_bypass(struct device *dev)
{
	return dev->archdata.iommu_bypass && !iommu_fixed_is_weak &&
		dma_direct_supported(dev, dev->coherent_dma_mask);
}

static inline bool dma_iommu_map_bypass(struct device *dev,
		unsigned long attrs)
{
	return dev->archdata.iommu_bypass &&
		(!iommu_fixed_is_weak || (attrs & DMA_ATTR_WEAK_ORDERING));
}

/* Allocates a contiguous real buffer and creates mappings over it.
 * Returns the virtual address of the buffer and sets dma_handle
 * to the dma address (mapping) of the first page.
 */
static void *dma_iommu_alloc_coherent(struct device *dev, size_t size,
				      dma_addr_t *dma_handle, gfp_t flag,
				      unsigned long attrs)
{
	if (dma_iommu_alloc_bypass(dev))
		return dma_direct_alloc(dev, size, dma_handle, flag, attrs);
	return iommu_alloc_coherent(dev, get_iommu_table_base(dev), size,
				    dma_handle, dev->coherent_dma_mask, flag,
				    dev_to_node(dev));
}

static void dma_iommu_free_coherent(struct device *dev, size_t size,
				    void *vaddr, dma_addr_t dma_handle,
				    unsigned long attrs)
{
	if (dma_iommu_alloc_bypass(dev))
		dma_direct_free(dev, size, vaddr, dma_handle, attrs);
	else
		iommu_free_coherent(get_iommu_table_base(dev), size, vaddr,
				dma_handle);
}

/* Creates TCEs for a user provided buffer.  The user buffer must be
 * contiguous real kernel storage (not vmalloc).  The address passed here
 * comprises a page address and offset into that page. The dma_addr_t
 * returned will point to the same byte within the page as was passed in.
 */
static dma_addr_t dma_iommu_map_page(struct device *dev, struct page *page,
				     unsigned long offset, size_t size,
				     enum dma_data_direction direction,
				     unsigned long attrs)
{
	if (dma_iommu_map_bypass(dev, attrs))
		return dma_direct_map_page(dev, page, offset, size, direction,
				attrs);
	return iommu_map_page(dev, get_iommu_table_base(dev), page, offset,
			      size, dma_get_mask(dev), direction, attrs);
}


static void dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle,
				 size_t size, enum dma_data_direction direction,
				 unsigned long attrs)
{
	if (!dma_iommu_map_bypass(dev, attrs))
		iommu_unmap_page(get_iommu_table_base(dev), dma_handle, size,
				direction,  attrs);
	else
		dma_direct_unmap_page(dev, dma_handle, size, direction, attrs);
}


static int dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist,
			    int nelems, enum dma_data_direction direction,
			    unsigned long attrs)
{
	if (dma_iommu_map_bypass(dev, attrs))
		return dma_direct_map_sg(dev, sglist, nelems, direction, attrs);
	return ppc_iommu_map_sg(dev, get_iommu_table_base(dev), sglist, nelems,
				dma_get_mask(dev), direction, attrs);
}

static void dma_iommu_unmap_sg(struct device *dev, struct scatterlist *sglist,
		int nelems, enum dma_data_direction direction,
		unsigned long attrs)
{
	if (!dma_iommu_map_bypass(dev, attrs))
		ppc_iommu_unmap_sg(get_iommu_table_base(dev), sglist, nelems,
			   direction, attrs);
	else
		dma_direct_unmap_sg(dev, sglist, nelems, direction, attrs);
}

static bool dma_iommu_bypass_supported(struct device *dev, u64 mask)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct pci_controller *phb = pci_bus_to_host(pdev->bus);

	return phb->controller_ops.iommu_bypass_supported &&
		phb->controller_ops.iommu_bypass_supported(pdev, mask);
}

/* We support DMA to/from any memory page via the iommu */
int dma_iommu_dma_supported(struct device *dev, u64 mask)
{
	struct iommu_table *tbl = get_iommu_table_base(dev);

	if (dev_is_pci(dev) && dma_iommu_bypass_supported(dev, mask)) {
		dev->archdata.iommu_bypass = true;
		dev_dbg(dev, "iommu: 64-bit OK, using fixed ops\n");
		return 1;
	}

	if (!tbl) {
		dev_err(dev, "Warning: IOMMU dma not supported: mask 0x%08llx, table unavailable\n", mask);
		return 0;
	}

	if (tbl->it_offset > (mask >> tbl->it_page_shift)) {
		dev_info(dev, "Warning: IOMMU offset too big for device mask\n");
		dev_info(dev, "mask: 0x%08llx, table offset: 0x%08lx\n",
				mask, tbl->it_offset << tbl->it_page_shift);
		return 0;
	}

	dev_dbg(dev, "iommu: not 64-bit, using default ops\n");
	dev->archdata.iommu_bypass = false;
	return 1;
}

u64 dma_iommu_get_required_mask(struct device *dev)
{
	struct iommu_table *tbl = get_iommu_table_base(dev);
	u64 mask;

	if (!tbl)
		return 0;

	if (dev_is_pci(dev)) {
		u64 bypass_mask = dma_direct_get_required_mask(dev);

		if (dma_iommu_bypass_supported(dev, bypass_mask))
			return bypass_mask;
	}

	mask = 1ULL < (fls_long(tbl->it_offset + tbl->it_size) - 1);
	mask += mask - 1;

	return mask;
}

static void dma_iommu_sync_for_cpu(struct device *dev, dma_addr_t addr,
		size_t size, enum dma_data_direction dir)
{
	if (dma_iommu_alloc_bypass(dev))
		dma_direct_sync_single_for_cpu(dev, addr, size, dir);
}

static void dma_iommu_sync_for_device(struct device *dev, dma_addr_t addr,
		size_t sz, enum dma_data_direction dir)
{
	if (dma_iommu_alloc_bypass(dev))
		dma_direct_sync_single_for_device(dev, addr, sz, dir);
}

extern void dma_iommu_sync_sg_for_cpu(struct device *dev,
		struct scatterlist *sgl, int nents, enum dma_data_direction dir)
{
	if (dma_iommu_alloc_bypass(dev))
		dma_direct_sync_sg_for_cpu(dev, sgl, nents, dir);
}

extern void dma_iommu_sync_sg_for_device(struct device *dev,
		struct scatterlist *sgl, int nents, enum dma_data_direction dir)
{
	if (dma_iommu_alloc_bypass(dev))
		dma_direct_sync_sg_for_device(dev, sgl, nents, dir);
}

const struct dma_map_ops dma_iommu_ops = {
	.alloc			= dma_iommu_alloc_coherent,
	.free			= dma_iommu_free_coherent,
	.map_sg			= dma_iommu_map_sg,
	.unmap_sg		= dma_iommu_unmap_sg,
	.dma_supported		= dma_iommu_dma_supported,
	.map_page		= dma_iommu_map_page,
	.unmap_page		= dma_iommu_unmap_page,
	.get_required_mask	= dma_iommu_get_required_mask,
	.sync_single_for_cpu	= dma_iommu_sync_for_cpu,
	.sync_single_for_device	= dma_iommu_sync_for_device,
	.sync_sg_for_cpu	= dma_iommu_sync_sg_for_cpu,
	.sync_sg_for_device	= dma_iommu_sync_sg_for_device,
	.mmap			= dma_common_mmap,
	.get_sgtable		= dma_common_get_sgtable,
};