framebuffer: fix border color
[linux/fpc-iii.git] / drivers / iommu / iommu.c
blob5b5fa5cdaa3108da74b7358ae187dd4ee8a00181
1 /*
2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 as published
7 * by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 #include <linux/device.h>
20 #include <linux/kernel.h>
21 #include <linux/bug.h>
22 #include <linux/types.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/errno.h>
26 #include <linux/iommu.h>
28 static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops)
32 /**
33 * bus_set_iommu - set iommu-callbacks for the bus
34 * @bus: bus.
35 * @ops: the callbacks provided by the iommu-driver
37 * This function is called by an iommu driver to set the iommu methods
38 * used for a particular bus. Drivers for devices on that bus can use
39 * the iommu-api after these ops are registered.
40 * This special function is needed because IOMMUs are usually devices on
41 * the bus itself, so the iommu drivers are not initialized when the bus
42 * is set up. With this function the iommu-driver can set the iommu-ops
43 * afterwards.
45 int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops)
47 if (bus->iommu_ops != NULL)
48 return -EBUSY;
50 bus->iommu_ops = ops;
52 /* Do IOMMU specific setup for this bus-type */
53 iommu_bus_init(bus, ops);
55 return 0;
57 EXPORT_SYMBOL_GPL(bus_set_iommu);
59 bool iommu_present(struct bus_type *bus)
61 return bus->iommu_ops != NULL;
63 EXPORT_SYMBOL_GPL(iommu_present);
65 /**
66 * iommu_set_fault_handler() - set a fault handler for an iommu domain
67 * @domain: iommu domain
68 * @handler: fault handler
70 * This function should be used by IOMMU users which want to be notified
71 * whenever an IOMMU fault happens.
73 * The fault handler itself should return 0 on success, and an appropriate
74 * error code otherwise.
76 void iommu_set_fault_handler(struct iommu_domain *domain,
77 iommu_fault_handler_t handler)
79 BUG_ON(!domain);
81 domain->handler = handler;
83 EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
85 struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
87 struct iommu_domain *domain;
88 int ret;
90 if (bus == NULL || bus->iommu_ops == NULL)
91 return NULL;
93 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
94 if (!domain)
95 return NULL;
97 domain->ops = bus->iommu_ops;
99 ret = domain->ops->domain_init(domain);
100 if (ret)
101 goto out_free;
103 return domain;
105 out_free:
106 kfree(domain);
108 return NULL;
110 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
112 void iommu_domain_free(struct iommu_domain *domain)
114 if (likely(domain->ops->domain_destroy != NULL))
115 domain->ops->domain_destroy(domain);
117 kfree(domain);
119 EXPORT_SYMBOL_GPL(iommu_domain_free);
121 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
123 if (unlikely(domain->ops->attach_dev == NULL))
124 return -ENODEV;
126 return domain->ops->attach_dev(domain, dev);
128 EXPORT_SYMBOL_GPL(iommu_attach_device);
130 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
132 if (unlikely(domain->ops->detach_dev == NULL))
133 return;
135 domain->ops->detach_dev(domain, dev);
137 EXPORT_SYMBOL_GPL(iommu_detach_device);
139 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
140 unsigned long iova)
142 if (unlikely(domain->ops->iova_to_phys == NULL))
143 return 0;
145 return domain->ops->iova_to_phys(domain, iova);
147 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
149 int iommu_domain_has_cap(struct iommu_domain *domain,
150 unsigned long cap)
152 if (unlikely(domain->ops->domain_has_cap == NULL))
153 return 0;
155 return domain->ops->domain_has_cap(domain, cap);
157 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
159 int iommu_map(struct iommu_domain *domain, unsigned long iova,
160 phys_addr_t paddr, int gfp_order, int prot)
162 size_t size;
164 if (unlikely(domain->ops->map == NULL))
165 return -ENODEV;
167 size = PAGE_SIZE << gfp_order;
169 BUG_ON(!IS_ALIGNED(iova | paddr, size));
171 return domain->ops->map(domain, iova, paddr, gfp_order, prot);
173 EXPORT_SYMBOL_GPL(iommu_map);
175 int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
177 size_t size;
179 if (unlikely(domain->ops->unmap == NULL))
180 return -ENODEV;
182 size = PAGE_SIZE << gfp_order;
184 BUG_ON(!IS_ALIGNED(iova, size));
186 return domain->ops->unmap(domain, iova, gfp_order);
188 EXPORT_SYMBOL_GPL(iommu_unmap);