/* * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. * Author: Joerg Roedel * * 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 */ #ifndef __LINUX_IOMMU_H #define __LINUX_IOMMU_H #include #define IOMMU_READ (1) #define IOMMU_WRITE (2) #define IOMMU_CACHE (4) /* DMA cache coherency */ struct iommu_ops; struct bus_type; struct device; struct iommu_domain; /* iommu fault flags */ #define IOMMU_FAULT_READ 0x0 #define IOMMU_FAULT_WRITE 0x1 typedef int (*iommu_fault_handler_t)(struct iommu_domain *, struct device *, unsigned long, int); struct iommu_domain { struct iommu_ops *ops; void *priv; iommu_fault_handler_t handler; }; #define IOMMU_CAP_CACHE_COHERENCY 0x1 #define IOMMU_CAP_INTR_REMAP 0x2 /* isolates device intrs */ #ifdef CONFIG_IOMMU_API /** * struct iommu_ops - iommu ops and capabilities * @domain_init: init iommu domain * @domain_destroy: destroy iommu domain * @attach_dev: attach device to an iommu domain * @detach_dev: detach device from an iommu domain * @map: map a physically contiguous memory region to an iommu domain * @unmap: unmap a physically contiguous memory region from an iommu domain * @iova_to_phys: translate iova to physical address * @domain_has_cap: domain capabilities query * @commit: commit iommu domain * @pgsize_bitmap: bitmap of supported page sizes */ struct iommu_ops { int (*domain_init)(struct iommu_domain *domain); void (*domain_destroy)(struct iommu_domain *domain); int (*attach_dev)(struct iommu_domain *domain, struct device *dev); void (*detach_dev)(struct iommu_domain *domain, struct device *dev); int (*map)(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot); size_t (*unmap)(struct iommu_domain *domain, unsigned long iova, size_t size); phys_addr_t (*iova_to_phys)(struct iommu_domain *domain, unsigned long iova); int (*domain_has_cap)(struct iommu_domain *domain, unsigned long cap); int (*device_group)(struct device *dev, unsigned int *groupid); unsigned long pgsize_bitmap; }; extern int bus_set_iommu(struct bus_type *bus, struct iommu_ops *ops); extern bool iommu_present(struct bus_type *bus); extern struct iommu_domain *iommu_domain_alloc(struct bus_type *bus); extern void iommu_domain_free(struct iommu_domain *domain); extern int iommu_attach_device(struct iommu_domain *domain, struct device *dev); extern void iommu_detach_device(struct iommu_domain *domain, struct device *dev); extern int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, size_t size, int prot); extern size_t iommu_unmap(struct iommu_domain *domain, unsigned long iova, size_t size); extern phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, unsigned long iova); extern int iommu_domain_has_cap(struct iommu_domain *domain, unsigned long cap); extern void iommu_set_fault_handler(struct iommu_domain *domain, iommu_fault_handler_t handler); extern int iommu_device_group(struct device *dev, unsigned int *groupid); /** * report_iommu_fault() - report about an IOMMU fault to the IOMMU framework * @domain: the iommu domain where the fault has happened * @dev: the device where the fault has happened * @iova: the faulting address * @flags: mmu fault flags (e.g. IOMMU_FAULT_READ/IOMMU_FAULT_WRITE/...) * * This function should be called by the low-level IOMMU implementations * whenever IOMMU faults happen, to allow high-level users, that are * interested in such events, to know about them. * * This event may be useful for several possible use cases: * - mere logging of the event * - dynamic TLB/PTE loading * - if restarting of the faulting device is required * * Returns 0 on success and an appropriate error code otherwise (if dynamic * PTE/TLB loading will one day be supported, implementations will be able * to tell whether it succeeded or not according to this return value). * * Specifically, -ENOSYS is returned if a fault handler isn't installed * (though fault handlers can also return -ENOSYS, in case they want to * elicit the default behavior of the IOMMU drivers). */ static inline int report_iommu_fault(struct iommu_domain *domain, struct device *dev, unsigned long iova, int flags) { int ret = -ENOSYS; /* * if upper layers showed interest and installed a fault handler, * invoke it. */ if (domain->handler) ret = domain->handler(domain, dev, iova, flags); return ret; } #else /* CONFIG_IOMMU_API */ struct iommu_ops {}; static inline bool iommu_present(struct bus_type *bus) { return false; } static inline struct iommu_domain *iommu_domain_alloc(struct bus_type *bus) { return NULL; } static inline void iommu_domain_free(struct iommu_domain *domain) { } static inline int iommu_attach_device(struct iommu_domain *domain, struct device *dev) { return -ENODEV; } static inline void iommu_detach_device(struct iommu_domain *domain, struct device *dev) { } static inline int iommu_map(struct iommu_domain *domain, unsigned long iova, phys_addr_t paddr, int gfp_order, int prot) { return -ENODEV; } static inline int iommu_unmap(struct iommu_domain *domain, unsigned long iova, int gfp_order) { return -ENODEV; } static inline phys_addr_t iommu_iova_to_phys(struct iommu_domain *domain, unsigned long iova) { return 0; } static inline int domain_has_cap(struct iommu_domain *domain, unsigned long cap) { return 0; } static inline void iommu_set_fault_handler(struct iommu_domain *domain, iommu_fault_handler_t handler) { } static inline int iommu_device_group(struct device *dev, unsigned int *groupid) { return -ENODEV; } #endif /* CONFIG_IOMMU_API */ #endif /* __LINUX_IOMMU_H */