diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c new file mode 100644 index 000000000000..2fb2963df553 --- /dev/null +++ b/drivers/iommu/iommu.c @@ -0,0 +1,188 @@ +/* + * 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 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) +{ + return bus->iommu_ops != NULL; +} +EXPORT_SYMBOL_GPL(iommu_present); + +/** + * iommu_set_fault_handler() - set a fault handler for an iommu domain + * @domain: iommu domain + * @handler: fault handler + * + * This function should be used by IOMMU users which want to be notified + * whenever an IOMMU fault happens. + * + * The fault handler itself should return 0 on success, and an appropriate + * error code otherwise. + */ +void iommu_set_fault_handler(struct iommu_domain *domain, + iommu_fault_handler_t handler) +{ + BUG_ON(!domain); + + domain->handler = handler; +} +EXPORT_SYMBOL_GPL(iommu_set_fault_handler); + +struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) +{ + struct iommu_domain *domain; + int ret; + + if (bus == NULL || bus->iommu_ops == NULL) + return NULL; + + domain = kmalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) + return NULL; + + domain->ops = bus->iommu_ops; + + ret = domain->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) +{ + if (likely(domain->ops->domain_destroy != NULL)) + domain->ops->domain_destroy(domain); + + kfree(domain); +} +EXPORT_SYMBOL_GPL(iommu_domain_free); + +int iommu_attach_device(struct iommu_domain *domain, struct device *dev) +{ + if (unlikely(domain->ops->attach_dev == NULL)) + return -ENODEV; + + return domain->ops->attach_dev(domain, dev); +} +EXPORT_SYMBOL_GPL(iommu_attach_device); + +void iommu_detach_device(struct iommu_domain *domain, struct device *dev) +{ + if (unlikely(domain->ops->detach_dev == NULL)) + return; + + domain->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) +{ + if (unlikely(domain->ops->iova_to_phys == NULL)) + return 0; + + return domain->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) +{ + if (unlikely(domain->ops->domain_has_cap == NULL)) + return 0; + + return domain->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; + + if (unlikely(domain->ops->map == NULL)) + return -ENODEV; + + size = PAGE_SIZE << gfp_order; + + BUG_ON(!IS_ALIGNED(iova | paddr, size)); + + return domain->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; + + if (unlikely(domain->ops->unmap == NULL)) + return -ENODEV; + + size = PAGE_SIZE << gfp_order; + + BUG_ON(!IS_ALIGNED(iova, size)); + + return domain->ops->unmap(domain, iova, gfp_order); +} +EXPORT_SYMBOL_GPL(iommu_unmap); |