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/errno.h>
  22 #include <linux/iommu.h>
  23
  24 static struct iommu_ops *iommu_ops;
  25
  26 void register_iommu(struct iommu_ops *ops)
  27 {
  28         if (iommu_ops)
  29                 BUG();
  30
  31         iommu_ops = ops;
  32 }
  33
  34 bool iommu_found(void)
  35 {
  36         return iommu_ops != NULL;
  37 }
  38 EXPORT_SYMBOL_GPL(iommu_found);
  39
  40 struct iommu_domain *iommu_domain_alloc(void)
  41 {
  42         struct iommu_domain *domain;
  43         int ret;
  44
  45         domain = kmalloc(sizeof(*domain), GFP_KERNEL);
  46         if (!domain)
  47                 return NULL;
  48
  49         ret = iommu_ops->domain_init(domain);
  50         if (ret)
  51                 goto out_free;
  52
  53         return domain;
  54
  55 out_free:
  56         kfree(domain);
  57
  58         return NULL;
  59 }
  60 EXPORT_SYMBOL_GPL(iommu_domain_alloc);
  61
  62 void iommu_domain_free(struct iommu_domain *domain)
  63 {
  64         iommu_ops->domain_destroy(domain);
  65         kfree(domain);
  66 }
  67 EXPORT_SYMBOL_GPL(iommu_domain_free);
  68
  69 int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
  70 {
  71         return iommu_ops->attach_dev(domain, dev);
  72 }
  73 EXPORT_SYMBOL_GPL(iommu_attach_device);
  74
  75 void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
  76 {
  77         iommu_ops->detach_dev(domain, dev);
  78 }
  79 EXPORT_SYMBOL_GPL(iommu_detach_device);
  80
  81 int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
  82                     phys_addr_t paddr, size_t size, int prot)
  83 {
  84         return iommu_ops->map(domain, iova, paddr, size, prot);
  85 }
  86 EXPORT_SYMBOL_GPL(iommu_map_range);
  87
  88 void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
  89                       size_t size)
  90 {
  91         iommu_ops->unmap(domain, iova, size);
  92 }
  93 EXPORT_SYMBOL_GPL(iommu_unmap_range);
  94
  95 phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  96                                unsigned long iova)
  97 {
  98         return iommu_ops->iova_to_phys(domain, iova);
  99 }
 100 EXPORT_SYMBOL_GPL(iommu_iova_to_phys);