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Diffstat (limited to 'kernel/arch/powerpc/include/asm/iommu.h')
| -rw-r--r-- | kernel/arch/powerpc/include/asm/iommu.h | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/include/asm/iommu.h b/kernel/arch/powerpc/include/asm/iommu.h new file mode 100644 index 000000000..1e27d6338 --- /dev/null +++ b/kernel/arch/powerpc/include/asm/iommu.h @@ -0,0 +1,216 @@ +/* + * 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> +#include <asm/pci-bridge.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); +#ifdef CONFIG_PPC_POWERNV + void *data; +#endif +}; + +/* 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); +extern int __init tce_iommu_bus_notifier_init(void); +#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) +{ +} + +static inline int __init tce_iommu_bus_notifier_init(void) +{ + return 0; +} +#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 ppc_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 ppc_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(struct pci_controller_ops *controller_ops); +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 */ |