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