/* * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation * Rewrite, cleanup: * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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 _ASM_IOMMU_H #define _ASM_IOMMU_H #ifdef __KERNEL__ #include <linux/compiler.h> #include <linux/spinlock.h> #include <linux/device.h> #include <linux/dma-mapping.h> #include <linux/bitops.h> #include <asm/machdep.h> #include <asm/types.h> #define IOMMU_PAGE_SHIFT_4K 12 #define IOMMU_PAGE_SIZE_4K (ASM_CONST(1) << IOMMU_PAGE_SHIFT_4K) #define IOMMU_PAGE_MASK_4K (~((1 << IOMMU_PAGE_SHIFT_4K) - 1)) #define IOMMU_PAGE_ALIGN_4K(addr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE_4K) #define IOMMU_PAGE_SIZE(tblptr) (ASM_CONST(1) << (tblptr)->it_page_shift) #define IOMMU_PAGE_MASK(tblptr) (~((1 << (tblptr)->it_page_shift) - 1)) #define IOMMU_PAGE_ALIGN(addr, tblptr) _ALIGN_UP(addr, IOMMU_PAGE_SIZE(tblptr)) /* Boot time flags */ extern int iommu_is_off; extern int iommu_force_on; /* * IOMAP_MAX_ORDER defines the largest contiguous block * of dma space we can get. IOMAP_MAX_ORDER = 13 * allows up to 2**12 pages (4096 * 4096) = 16 MB */ #define IOMAP_MAX_ORDER 13 #define IOMMU_POOL_HASHBITS 2 #define IOMMU_NR_POOLS (1 << IOMMU_POOL_HASHBITS) struct iommu_pool { unsigned long start; unsigned long end; unsigned long hint; spinlock_t lock; } ____cacheline_aligned_in_smp; struct iommu_table { unsigned long it_busno; /* Bus number this table belongs to */ unsigned long it_size; /* Size of iommu table in entries */ unsigned long it_offset; /* Offset into global table */ unsigned long it_base; /* mapped address of tce table */ unsigned long it_index; /* which iommu table this is */ unsigned long it_type; /* type: PCI or Virtual Bus */ unsigned long it_blocksize; /* Entries in each block (cacheline) */ unsigned long poolsize; unsigned long nr_pools; struct iommu_pool large_pool; struct iommu_pool pools[IOMMU_NR_POOLS]; unsigned long *it_map; /* A simple allocation bitmap for now */ unsigned long it_page_shift;/* table iommu page size */ #ifdef CONFIG_IOMMU_API struct iommu_group *it_group; #endif void (*set_bypass)(struct iommu_table *tbl, bool enable); }; /* Pure 2^n version of get_order */ static inline __attribute_const__ int get_iommu_order(unsigned long size, struct iommu_table *tbl) { return __ilog2((size - 1) >> tbl->it_page_shift) + 1; } struct scatterlist; static inline void set_iommu_table_base(struct device *dev, void *base) { dev->archdata.dma_data.iommu_table_base = base; } static inline void *get_iommu_table_base(struct device *dev) { return dev->archdata.dma_data.iommu_table_base; } /* Frees table for an individual device node */ extern void iommu_free_table(struct iommu_table *tbl, const char *node_name); /* Initializes an iommu_table based in values set in the passed-in * structure */ extern struct iommu_table *iommu_init_table(struct iommu_table * tbl, int nid); #ifdef CONFIG_IOMMU_API extern void iommu_register_group(struct iommu_table *tbl, int pci_domain_number, unsigned long pe_num); extern int iommu_add_device(struct device *dev); extern void iommu_del_device(struct device *dev); #else static inline void iommu_register_group(struct iommu_table *tbl, int pci_domain_number, unsigned long pe_num) { } static inline int iommu_add_device(struct device *dev) { return 0; } static inline void iommu_del_device(struct device *dev) { } #endif /* !CONFIG_IOMMU_API */ static inline void set_iommu_table_base_and_group(struct device *dev, void *base) { set_iommu_table_base(dev, base); iommu_add_device(dev); } extern int iommu_map_sg(struct device *dev, struct iommu_table *tbl, struct scatterlist *sglist, int nelems, unsigned long mask, enum dma_data_direction direction, struct dma_attrs *attrs); extern void iommu_unmap_sg(struct iommu_table *tbl, struct scatterlist *sglist, int nelems, enum dma_data_direction direction, struct dma_attrs *attrs); extern void *iommu_alloc_coherent(struct device *dev, struct iommu_table *tbl, size_t size, dma_addr_t *dma_handle, unsigned long mask, gfp_t flag, int node); extern void iommu_free_coherent(struct iommu_table *tbl, size_t size, void *vaddr, dma_addr_t dma_handle); extern dma_addr_t iommu_map_page(struct device *dev, struct iommu_table *tbl, struct page *page, unsigned long offset, size_t size, unsigned long mask, enum dma_data_direction direction, struct dma_attrs *attrs); extern void iommu_unmap_page(struct iommu_table *tbl, dma_addr_t dma_handle, size_t size, enum dma_data_direction direction, struct dma_attrs *attrs); extern void iommu_init_early_pSeries(void); extern void iommu_init_early_dart(void); extern void iommu_init_early_pasemi(void); extern void alloc_dart_table(void); #if defined(CONFIG_PPC64) && defined(CONFIG_PM) static inline void iommu_save(void) { if (ppc_md.iommu_save) ppc_md.iommu_save(); } static inline void iommu_restore(void) { if (ppc_md.iommu_restore) ppc_md.iommu_restore(); } #endif /* The API to support IOMMU operations for VFIO */ extern int iommu_tce_clear_param_check(struct iommu_table *tbl, unsigned long ioba, unsigned long tce_value, unsigned long npages); extern int iommu_tce_put_param_check(struct iommu_table *tbl, unsigned long ioba, unsigned long tce); extern int iommu_tce_build(struct iommu_table *tbl, unsigned long entry, unsigned long hwaddr, enum dma_data_direction direction); extern unsigned long iommu_clear_tce(struct iommu_table *tbl, unsigned long entry); extern int iommu_clear_tces_and_put_pages(struct iommu_table *tbl, unsigned long entry, unsigned long pages); extern int iommu_put_tce_user_mode(struct iommu_table *tbl, unsigned long entry, unsigned long tce); extern void iommu_flush_tce(struct iommu_table *tbl); extern int iommu_take_ownership(struct iommu_table *tbl); extern void iommu_release_ownership(struct iommu_table *tbl); extern enum dma_data_direction iommu_tce_direction(unsigned long tce); #endif /* __KERNEL__ */ #endif /* _ASM_IOMMU_H */