/drivers/base/iommu.c

  1/*
  2 * Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
  3 * Author: Joerg Roedel <joerg.roedel@amd.com>
  4 *
  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.
  8 *
  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.
 13 *
 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
 17 */
 18
 19#include <linux/bug.h>
 20#include <linux/types.h>
 21#include <linux/module.h>
 22#include <linux/slab.h>
 23#include <linux/errno.h>
 24#include <linux/iommu.h>
 25
 26static struct iommu_ops *iommu_ops;
 27
 28void register_iommu(struct iommu_ops *ops)
 29{
 30	if (iommu_ops)
 31		BUG();
 32
 33	iommu_ops = ops;
 34}
 35
 36bool iommu_found(void)
 37{
 38	return iommu_ops != NULL;
 39}
 40EXPORT_SYMBOL_GPL(iommu_found);
 41
 42struct iommu_domain *iommu_domain_alloc(void)
 43{
 44	struct iommu_domain *domain;
 45	int ret;
 46
 47	domain = kmalloc(sizeof(*domain), GFP_KERNEL);
 48	if (!domain)
 49		return NULL;
 50
 51	ret = iommu_ops->domain_init(domain);
 52	if (ret)
 53		goto out_free;
 54
 55	return domain;
 56
 57out_free:
 58	kfree(domain);
 59
 60	return NULL;
 61}
 62EXPORT_SYMBOL_GPL(iommu_domain_alloc);
 63
 64void iommu_domain_free(struct iommu_domain *domain)
 65{
 66	iommu_ops->domain_destroy(domain);
 67	kfree(domain);
 68}
 69EXPORT_SYMBOL_GPL(iommu_domain_free);
 70
 71int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
 72{
 73	return iommu_ops->attach_dev(domain, dev);
 74}
 75EXPORT_SYMBOL_GPL(iommu_attach_device);
 76
 77void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
 78{
 79	iommu_ops->detach_dev(domain, dev);
 80}
 81EXPORT_SYMBOL_GPL(iommu_detach_device);
 82
 83phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
 84			       unsigned long iova)
 85{
 86	return iommu_ops->iova_to_phys(domain, iova);
 87}
 88EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
 89
 90int iommu_domain_has_cap(struct iommu_domain *domain,
 91			 unsigned long cap)
 92{
 93	return iommu_ops->domain_has_cap(domain, cap);
 94}
 95EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
 96
 97int iommu_map(struct iommu_domain *domain, unsigned long iova,
 98	      phys_addr_t paddr, int gfp_order, int prot)
 99{
100	unsigned long invalid_mask;
101	size_t size;
102
103	size         = 0x1000UL << gfp_order;
104	invalid_mask = size - 1;
105
106	BUG_ON((iova | paddr) & invalid_mask);
107
108	return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
109}
110EXPORT_SYMBOL_GPL(iommu_map);
111
112int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
113{
114	unsigned long invalid_mask;
115	size_t size;
116
117	size         = 0x1000UL << gfp_order;
118	invalid_mask = size - 1;
119
120	BUG_ON(iova & invalid_mask);
121
122	return iommu_ops->unmap(domain, iova, gfp_order);
123}
124EXPORT_SYMBOL_GPL(iommu_unmap);