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[PATCH] gfp flags annotations - part 1
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1da177e4
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1/*
2 * arch/ppc64/kernel/pci_iommu.c
3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
4 *
5 * Rewrite, cleanup, new allocation schemes:
6 * Copyright (C) 2004 Olof Johansson, IBM Corporation
7 *
8 * Dynamic DMA mapping support, platform-independent parts.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25
26#include <linux/config.h>
27#include <linux/init.h>
28#include <linux/types.h>
29#include <linux/slab.h>
30#include <linux/mm.h>
31#include <linux/spinlock.h>
32#include <linux/string.h>
33#include <linux/pci.h>
34#include <linux/dma-mapping.h>
35#include <asm/io.h>
36#include <asm/prom.h>
37#include <asm/iommu.h>
38#include <asm/pci-bridge.h>
39#include <asm/machdep.h>
40#include "pci.h"
41
42#ifdef CONFIG_PPC_ISERIES
43#include <asm/iSeries/iSeries_pci.h>
44#endif /* CONFIG_PPC_ISERIES */
45
46/*
47 * We can use ->sysdata directly and avoid the extra work in
48 * pci_device_to_OF_node since ->sysdata will have been initialised
49 * in the iommu init code for all devices.
50 */
51#define PCI_GET_DN(dev) ((struct device_node *)((dev)->sysdata))
52
53static inline struct iommu_table *devnode_table(struct device *dev)
54{
55 struct pci_dev *pdev;
56
57 if (!dev) {
58 pdev = ppc64_isabridge_dev;
59 if (!pdev)
60 return NULL;
61 } else
62 pdev = to_pci_dev(dev);
63
64#ifdef CONFIG_PPC_ISERIES
65 return ISERIES_DEVNODE(pdev)->iommu_table;
66#endif /* CONFIG_PPC_ISERIES */
67
68#ifdef CONFIG_PPC_MULTIPLATFORM
1635317f 69 return PCI_DN(PCI_GET_DN(pdev))->iommu_table;
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70#endif /* CONFIG_PPC_MULTIPLATFORM */
71}
72
73
74/* Allocates a contiguous real buffer and creates mappings over it.
75 * Returns the virtual address of the buffer and sets dma_handle
76 * to the dma address (mapping) of the first page.
77 */
78static void *pci_iommu_alloc_coherent(struct device *hwdev, size_t size,
dd0fc66f 79 dma_addr_t *dma_handle, gfp_t flag)
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80{
81 return iommu_alloc_coherent(devnode_table(hwdev), size, dma_handle,
82 flag);
83}
84
85static void pci_iommu_free_coherent(struct device *hwdev, size_t size,
86 void *vaddr, dma_addr_t dma_handle)
87{
88 iommu_free_coherent(devnode_table(hwdev), size, vaddr, dma_handle);
89}
90
91/* Creates TCEs for a user provided buffer. The user buffer must be
92 * contiguous real kernel storage (not vmalloc). The address of the buffer
93 * passed here is the kernel (virtual) address of the buffer. The buffer
94 * need not be page aligned, the dma_addr_t returned will point to the same
95 * byte within the page as vaddr.
96 */
97static dma_addr_t pci_iommu_map_single(struct device *hwdev, void *vaddr,
98 size_t size, enum dma_data_direction direction)
99{
100 return iommu_map_single(devnode_table(hwdev), vaddr, size, direction);
101}
102
103
104static void pci_iommu_unmap_single(struct device *hwdev, dma_addr_t dma_handle,
105 size_t size, enum dma_data_direction direction)
106{
107 iommu_unmap_single(devnode_table(hwdev), dma_handle, size, direction);
108}
109
110
111static int pci_iommu_map_sg(struct device *pdev, struct scatterlist *sglist,
112 int nelems, enum dma_data_direction direction)
113{
114 return iommu_map_sg(pdev, devnode_table(pdev), sglist,
115 nelems, direction);
116}
117
118static void pci_iommu_unmap_sg(struct device *pdev, struct scatterlist *sglist,
119 int nelems, enum dma_data_direction direction)
120{
121 iommu_unmap_sg(devnode_table(pdev), sglist, nelems, direction);
122}
123
124/* We support DMA to/from any memory page via the iommu */
125static int pci_iommu_dma_supported(struct device *dev, u64 mask)
126{
127 return 1;
128}
129
130void pci_iommu_init(void)
131{
132 pci_dma_ops.alloc_coherent = pci_iommu_alloc_coherent;
133 pci_dma_ops.free_coherent = pci_iommu_free_coherent;
134 pci_dma_ops.map_single = pci_iommu_map_single;
135 pci_dma_ops.unmap_single = pci_iommu_unmap_single;
136 pci_dma_ops.map_sg = pci_iommu_map_sg;
137 pci_dma_ops.unmap_sg = pci_iommu_unmap_sg;
138 pci_dma_ops.dma_supported = pci_iommu_dma_supported;
139}