LXR linux/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
  83int iommu_map_range(struct iommu_domain *domain, unsigned long iova,
  84                    phys_addr_t paddr, size_t size, int prot)
  85{
  86        return iommu_ops->map(domain, iova, paddr, size, prot);
  87}
  88EXPORT_SYMBOL_GPL(iommu_map_range);
  89
  90void iommu_unmap_range(struct iommu_domain *domain, unsigned long iova,
  91                      size_t size)
  92{
  93        iommu_ops->unmap(domain, iova, size);
  94}
  95EXPORT_SYMBOL_GPL(iommu_unmap_range);
  96
  97phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
  98                               unsigned long iova)
  99{
 100        return iommu_ops->iova_to_phys(domain, iova);
 101}
 102EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
 103
 104int iommu_domain_has_cap(struct iommu_domain *domain,
 105                         unsigned long cap)
 106{
 107        return iommu_ops->domain_has_cap(domain, cap);
 108}
 109EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
 110