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); 125