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0ed6d2d27b
Make report_iommu_fault() return -ENOSYS whenever an iommu fault handler isn't installed, so IOMMU drivers can then do their own platform-specific default behavior if they wanted. Fault handlers can still return -ENOSYS in case they want to elicit the default behavior of the IOMMU drivers. Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
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* Copyright (C) 2007-2008 Advanced Micro Devices, Inc.
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* Author: Joerg Roedel <joerg.roedel@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/bug.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/iommu.h>
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static struct iommu_ops *iommu_ops;
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void register_iommu(struct iommu_ops *ops)
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{
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if (iommu_ops)
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BUG();
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iommu_ops = ops;
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}
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bool iommu_found(void)
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{
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return iommu_ops != NULL;
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}
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EXPORT_SYMBOL_GPL(iommu_found);
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/**
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* iommu_set_fault_handler() - set a fault handler for an iommu domain
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* @domain: iommu domain
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* @handler: fault handler
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*
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* This function should be used by IOMMU users which want to be notified
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* whenever an IOMMU fault happens.
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*
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* The fault handler itself should return 0 on success, and an appropriate
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* error code otherwise.
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*/
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void iommu_set_fault_handler(struct iommu_domain *domain,
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iommu_fault_handler_t handler)
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{
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BUG_ON(!domain);
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domain->handler = handler;
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}
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EXPORT_SYMBOL_GPL(iommu_set_fault_handler);
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struct iommu_domain *iommu_domain_alloc(void)
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{
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struct iommu_domain *domain;
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int ret;
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domain = kmalloc(sizeof(*domain), GFP_KERNEL);
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if (!domain)
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return NULL;
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ret = iommu_ops->domain_init(domain);
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if (ret)
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goto out_free;
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return domain;
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out_free:
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kfree(domain);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(iommu_domain_alloc);
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void iommu_domain_free(struct iommu_domain *domain)
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{
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iommu_ops->domain_destroy(domain);
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kfree(domain);
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}
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EXPORT_SYMBOL_GPL(iommu_domain_free);
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int iommu_attach_device(struct iommu_domain *domain, struct device *dev)
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{
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return iommu_ops->attach_dev(domain, dev);
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}
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EXPORT_SYMBOL_GPL(iommu_attach_device);
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void iommu_detach_device(struct iommu_domain *domain, struct device *dev)
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{
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iommu_ops->detach_dev(domain, dev);
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}
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EXPORT_SYMBOL_GPL(iommu_detach_device);
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phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain,
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unsigned long iova)
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{
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return iommu_ops->iova_to_phys(domain, iova);
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}
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EXPORT_SYMBOL_GPL(iommu_iova_to_phys);
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int iommu_domain_has_cap(struct iommu_domain *domain,
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unsigned long cap)
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{
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return iommu_ops->domain_has_cap(domain, cap);
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}
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EXPORT_SYMBOL_GPL(iommu_domain_has_cap);
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int iommu_map(struct iommu_domain *domain, unsigned long iova,
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phys_addr_t paddr, int gfp_order, int prot)
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{
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unsigned long invalid_mask;
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size_t size;
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size = 0x1000UL << gfp_order;
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invalid_mask = size - 1;
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BUG_ON((iova | paddr) & invalid_mask);
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return iommu_ops->map(domain, iova, paddr, gfp_order, prot);
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}
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EXPORT_SYMBOL_GPL(iommu_map);
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int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order)
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{
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unsigned long invalid_mask;
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size_t size;
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size = 0x1000UL << gfp_order;
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invalid_mask = size - 1;
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BUG_ON(iova & invalid_mask);
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return iommu_ops->unmap(domain, iova, gfp_order);
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}
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EXPORT_SYMBOL_GPL(iommu_unmap);
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