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/*
* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
* Author: Joerg Roedel <joerg.roedel@amd.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/bug.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/iommu.h>
static struct iommu_ops *iommu_ops;
void register_iommu(struct iommu_ops *ops)
{
if (iommu_ops)
BUG();
iommu_ops = ops;
}
static void iommu_bus_init(struct bus_type *bus, struct iommu_ops *ops)
{
}
/**
* bus_set_iommu - set iommu-callbacks for the bus
* @bus: bus.
* @ops: the callbacks provided by the iommu-driver
*
* This function is called by an iommu driver to set the iommu methods
* used for a particular bus. Drivers for devices on that bus can use
* the iommu-api after these ops are registered.
* This special function is needed because IOMMUs are usually devices on
* the bus itself, so the iommu drivers are not initialized when the bus
* is set up. With this function the iommu-driver can set the iommu-ops
* afterwards.
*/
int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops)
{
if (bus->iommu_ops != NULL)
return -EBUSY;
bus->iommu_ops = ops;
/* Do IOMMU specific setup for this bus-type */
iommu_bus_init(bus, ops);
return 0;
}
EXPORT_SYMBOL_GPL(bus_set_iommu);
bool iommu_present(struct bus_type *bus)
{
if (bus->iommu_ops != NULL)
return true;
else
return iommu_ops != NULL;
}
EXPORT_SYMBOL_GPL(iommu_present);
struct iommu_domain *iommu_domain_alloc(struct bus_type *bus)
{
struct iommu_domain *domain;
struct iommu_ops *ops;
int ret;
if (bus->iommu_ops)
ops = bus->iommu_ops;
else
ops = iommu_ops;
if (ops == NULL)
return NULL;
domain = kmalloc(sizeof(*domain), GFP_KERNEL);
if (!domain)
return NULL;
domain->ops = ops;
ret = iommu_ops->domain_init(domain);
if (ret)
goto out_free;
return domain;
out_free:
kfree(domain);
return NULL;
}
EXPORT_SYMBOL_GPL(iommu_domain_alloc);
void iommu_domain_free(struct iommu_domain *domain)
{
iommu_ops->domain_destroy(domain);
kfree(domain);
}
EXPORT_SYMBOL_GPL(iommu_domain_free);
int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
{
return iommu_ops->attach_dev(domain, dev);
}
EXPORT_SYMBOL_GPL(iommu_attach_device);
void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
{
iommu_ops->detach_dev(domain, dev);
}
EXPORT_SYMBOL_GPL(iommu_detach_device);
phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
unsigned long iova)
{
return iommu_ops->iova_to_phys(domain, iova);
}
EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
int iommu_domain_has_cap(struct iommu_domain *domain,
unsigned long cap)
{
return iommu_ops->domain_has_cap(domain, cap);
}
EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
int iommu_map(struct iommu_domain *domain, unsigned long iova,
phys_addr_t paddr, int gfp_order, int prot)
{
size_t size;
size = PAGE_SIZE << gfp_order;
BUG_ON(!IS_ALIGNED(iova | paddr, size));
return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
}
EXPORT_SYMBOL_GPL(iommu_map);
int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
{
size_t size;
size = PAGE_SIZE << gfp_order;
BUG_ON(!IS_ALIGNED(iova, size));
return iommu_ops->unmap(domain, iova, gfp_order);
}
EXPORT_SYMBOL_GPL(iommu_unmap);
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