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
  26 static struct iommu_ops *iommu_ops;
  27
  28 void register_iommu(struct iommu_ops *ops)
  29 {
  30         if (iommu_ops)
  31                 BUG();
  32
  33         iommu_ops = ops;
  34 }
  35
  36 bool iommu_found(void)
  37 {
  38         return iommu_ops != NULL;
  39 }
  40 EXPORT_SYMBOL_GPL(iommu_found);
  41
  42 struct 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
  57 out_free:
  58         kfree(domain);
  59
  60         return NULL;
  61 }
  62 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
  63
  64 void iommu_domain_free(struct iommu_domain *domain)
  65 {
  66         iommu_ops->domain_destroy(domain);
  67         kfree(domain);
  68 }
  69 EXPORT_SYMBOL_GPL(iommu_domain_free);
  70
  71 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
  72 {
  73         return iommu_ops->attach_dev(domain, dev);
  74 }
  75 EXPORT_SYMBOL_GPL(iommu_attach_device);
  76
  77 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
  78 {
  79         iommu_ops->detach_dev(domain, dev);
  80 }
  81 EXPORT_SYMBOL_GPL(iommu_detach_device);
  82
  83 phys_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 }
  88 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
  89
  90 int iommu_domain_has_cap(struct iommu_domain *domain,
  91                          unsigned long cap)
  92 {
  93         return iommu_ops->domain_has_cap(domain, cap);
  94 }
  95 EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
  96
  97 int 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 }
 110 EXPORT_SYMBOL_GPL(iommu_map);
 111
 112 int 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 }
 124 EXPORT_SYMBOL_GPL(iommu_unmap);