arch/powerpc/include/asm/iommu.h - kernel/msm-4.9 - Gitiles

 /*
  * 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 */
	/*
	* 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 */