[linux-block.git] / include / linux / iova.h

/*
 * Copyright (c) 2006, Intel Corporation.
 *
 * This file is released under the GPLv2.
 *
 * Copyright (C) 2006-2008 Intel Corporation
 * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
 *
 */

#ifndef _IOVA_H_
#define _IOVA_H_

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/rbtree.h>
#include <linux/atomic.h>
#include <linux/dma-mapping.h>

/* iova structure */
struct iova {
	struct rb_node	node;
	unsigned long	pfn_hi; /* Highest allocated pfn */
	unsigned long	pfn_lo; /* Lowest allocated pfn */
};

struct iova_magazine;
struct iova_cpu_rcache;

#define IOVA_RANGE_CACHE_MAX_SIZE 6	/* log of max cached IOVA range size (in pages) */
#define MAX_GLOBAL_MAGS 32	/* magazines per bin */

struct iova_rcache {
	spinlock_t lock;
	unsigned long depot_size;
	struct iova_magazine *depot[MAX_GLOBAL_MAGS];
	struct iova_cpu_rcache __percpu *cpu_rcaches;
};

struct iova_domain;

/* Call-Back from IOVA code into IOMMU drivers */
typedef void (* iova_flush_cb)(struct iova_domain *domain);

/* Destructor for per-entry data */
typedef void (* iova_entry_dtor)(unsigned long data);

/* Number of entries per Flush Queue */
#define IOVA_FQ_SIZE	256

/* Timeout (in ms) after which entries are flushed from the Flush-Queue */
#define IOVA_FQ_TIMEOUT	10

/* Flush Queue entry for defered flushing */
struct iova_fq_entry {
	unsigned long iova_pfn;
	unsigned long pages;
	unsigned long data;
	u64 counter; /* Flush counter when this entrie was added */
};

/* Per-CPU Flush Queue structure */
struct iova_fq {
	struct iova_fq_entry entries[IOVA_FQ_SIZE];
	unsigned head, tail;
	spinlock_t lock;
};

/* holds all the iova translations for a domain */
struct iova_domain {
	spinlock_t	iova_rbtree_lock; /* Lock to protect update of rbtree */
	struct rb_root	rbroot;		/* iova domain rbtree root */
	struct rb_node	*cached_node;	/* Save last alloced node */
	struct rb_node	*cached32_node; /* Save last 32-bit alloced node */
	unsigned long	granule;	/* pfn granularity for this domain */
	unsigned long	start_pfn;	/* Lower limit for this domain */
	unsigned long	dma_32bit_pfn;
	struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE];	/* IOVA range caches */

	iova_flush_cb	flush_cb;	/* Call-Back function to flush IOMMU
					   TLBs */

	iova_entry_dtor entry_dtor;	/* IOMMU driver specific destructor for
					   iova entry */

	struct iova_fq __percpu *fq;	/* Flush Queue */

	atomic64_t	fq_flush_start_cnt;	/* Number of TLB flushes that
						   have been started */

	atomic64_t	fq_flush_finish_cnt;	/* Number of TLB flushes that
						   have been finished */

	struct timer_list fq_timer;		/* Timer to regularily empty the
						   flush-queues */
	atomic_t fq_timer_on;			/* 1 when timer is active, 0
						   when not */
};

static inline unsigned long iova_size(struct iova *iova)
{
	return iova->pfn_hi - iova->pfn_lo + 1;
}

static inline unsigned long iova_shift(struct iova_domain *iovad)
{
	return __ffs(iovad->granule);
}

static inline unsigned long iova_mask(struct iova_domain *iovad)
{
	return iovad->granule - 1;
}

static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
{
	return iova & iova_mask(iovad);
}

static inline size_t iova_align(struct iova_domain *iovad, size_t size)
{
	return ALIGN(size, iovad->granule);
}

static inline dma_addr_t iova_dma_addr(struct iova_domain *iovad, struct iova *iova)
{
	return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
}

static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
{
	return iova >> iova_shift(iovad);
}

#if IS_ENABLED(CONFIG_IOMMU_IOVA)
int iova_cache_get(void);
void iova_cache_put(void);

struct iova *alloc_iova_mem(void);
void free_iova_mem(struct iova *iova);
void free_iova(struct iova_domain *iovad, unsigned long pfn);
void __free_iova(struct iova_domain *iovad, struct iova *iova);
struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
	unsigned long limit_pfn,
	bool size_aligned);
void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
		    unsigned long size);
void queue_iova(struct iova_domain *iovad,
		unsigned long pfn, unsigned long pages,
		unsigned long data);
unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
			      unsigned long limit_pfn);
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
	unsigned long pfn_hi);
void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
	unsigned long start_pfn);
int init_iova_flush_queue(struct iova_domain *iovad,
			  iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
void put_iova_domain(struct iova_domain *iovad);
struct iova *split_and_remove_iova(struct iova_domain *iovad,
	struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
#else
static inline int iova_cache_get(void)
{
	return -ENOTSUPP;
}

static inline void iova_cache_put(void)
{
}

static inline struct iova *alloc_iova_mem(void)
{
	return NULL;
}

static inline void free_iova_mem(struct iova *iova)
{
}

static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
{
}

static inline void __free_iova(struct iova_domain *iovad, struct iova *iova)
{
}

static inline struct iova *alloc_iova(struct iova_domain *iovad,
				      unsigned long size,
				      unsigned long limit_pfn,
				      bool size_aligned)
{
	return NULL;
}

static inline void free_iova_fast(struct iova_domain *iovad,
				  unsigned long pfn,
				  unsigned long size)
{
}

static inline void queue_iova(struct iova_domain *iovad,
			      unsigned long pfn, unsigned long pages,
			      unsigned long data)
{
}

static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
					    unsigned long size,
					    unsigned long limit_pfn)
{
	return 0;
}

static inline struct iova *reserve_iova(struct iova_domain *iovad,
					unsigned long pfn_lo,
					unsigned long pfn_hi)
{
	return NULL;
}

static inline void copy_reserved_iova(struct iova_domain *from,
				      struct iova_domain *to)
{
}

static inline void init_iova_domain(struct iova_domain *iovad,
				    unsigned long granule,
				    unsigned long start_pfn)
{
}

static inline int init_iova_flush_queue(struct iova_domain *iovad,
					iova_flush_cb flush_cb,
					iova_entry_dtor entry_dtor)
{
	return -ENODEV;
}

static inline struct iova *find_iova(struct iova_domain *iovad,
				     unsigned long pfn)
{
	return NULL;
}

static inline void put_iova_domain(struct iova_domain *iovad)
{
}

static inline struct iova *split_and_remove_iova(struct iova_domain *iovad,
						 struct iova *iova,
						 unsigned long pfn_lo,
						 unsigned long pfn_hi)
{
	return NULL;
}

static inline void free_cpu_cached_iovas(unsigned int cpu,
					 struct iova_domain *iovad)
{
}
#endif

#endif
Commit	Line	Data
f8de50eb KA	1	/*
	2	* Copyright (c) 2006, Intel Corporation.
	3	*
	4	* This file is released under the GPLv2.
	5	*
98bcef56	6	* Copyright (C) 2006-2008 Intel Corporation
98bcef56	7	* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
f8de50eb KA	8	*
	9	*/
	10
	11	#ifndef _IOVA_H_
	12	#define _IOVA_H_
	13
	14	#include <linux/types.h>
	15	#include <linux/kernel.h>
	16	#include <linux/rbtree.h>
fb418dab	17	#include <linux/atomic.h>
f8de50eb KA	18	#include <linux/dma-mapping.h>
f8de50eb KA	19
f8de50eb KA	20	/* iova structure */
	21	struct iova {
	22	struct rb_node node;
9257b4a2 OP	23	unsigned long pfn_hi; /* Highest allocated pfn */
	24	unsigned long pfn_lo; /* Lowest allocated pfn */
	25	};
	26
	27	struct iova_magazine;
	28	struct iova_cpu_rcache;
	29
	30	#define IOVA_RANGE_CACHE_MAX_SIZE 6 /* log of max cached IOVA range size (in pages) */
	31	#define MAX_GLOBAL_MAGS 32 /* magazines per bin */
	32
	33	struct iova_rcache {
	34	spinlock_t lock;
	35	unsigned long depot_size;
	36	struct iova_magazine *depot[MAX_GLOBAL_MAGS];
	37	struct iova_cpu_rcache __percpu *cpu_rcaches;
f8de50eb KA	38	};
f8de50eb KA	39
42f87e71 JR	40	struct iova_domain;
	41
	42	/* Call-Back from IOVA code into IOMMU drivers */
	43	typedef void (* iova_flush_cb)(struct iova_domain *domain);
	44
	45	/* Destructor for per-entry data */
	46	typedef void (* iova_entry_dtor)(unsigned long data);
	47
	48	/* Number of entries per Flush Queue */
	49	#define IOVA_FQ_SIZE 256
	50
9a005a80 JR	51	/* Timeout (in ms) after which entries are flushed from the Flush-Queue */
	52	#define IOVA_FQ_TIMEOUT 10
	53
42f87e71 JR	54	/* Flush Queue entry for defered flushing */
	55	struct iova_fq_entry {
	56	unsigned long iova_pfn;
	57	unsigned long pages;
	58	unsigned long data;
fb418dab	59	u64 counter; /* Flush counter when this entrie was added */
42f87e71 JR	60	};
	61
	62	/* Per-CPU Flush Queue structure */
	63	struct iova_fq {
	64	struct iova_fq_entry entries[IOVA_FQ_SIZE];
	65	unsigned head, tail;
8109c2a2	66	spinlock_t lock;
42f87e71 JR	67	};
42f87e71 JR	68
f8de50eb KA	69	/* holds all the iova translations for a domain */
f8de50eb KA	70	struct iova_domain {
f8de50eb KA	71	spinlock_t iova_rbtree_lock; /* Lock to protect update of rbtree */
f8de50eb KA	72	struct rb_root rbroot; /* iova domain rbtree root */
e60aa7b5 RM	73	struct rb_node cached_node; / Save last alloced node */
e60aa7b5 RM	74	struct rb_node cached32_node; / Save last 32-bit alloced node */
0fb5fe87	75	unsigned long granule; /* pfn granularity for this domain */
1b722500	76	unsigned long start_pfn; /* Lower limit for this domain */
f661197e	77	unsigned long dma_32bit_pfn;
9257b4a2	78	struct iova_rcache rcaches[IOVA_RANGE_CACHE_MAX_SIZE]; /* IOVA range caches */
42f87e71 JR	79
	80	iova_flush_cb flush_cb; /* Call-Back function to flush IOMMU
	81	TLBs */
	82
	83	iova_entry_dtor entry_dtor; /* IOMMU driver specific destructor for
	84	iova entry */
	85
	86	struct iova_fq __percpu fq; / Flush Queue */
fb418dab JR	87
	88	atomic64_t fq_flush_start_cnt; /* Number of TLB flushes that
	89	have been started */
	90
	91	atomic64_t fq_flush_finish_cnt; /* Number of TLB flushes that
	92	have been finished */
9a005a80 JR	93
	94	struct timer_list fq_timer; /* Timer to regularily empty the
	95	flush-queues */
	96	atomic_t fq_timer_on; /* 1 when timer is active, 0
	97	when not */
f8de50eb KA	98	};
f8de50eb KA	99
a156ef99 JL	100	static inline unsigned long iova_size(struct iova *iova)
	101	{
	102	return iova->pfn_hi - iova->pfn_lo + 1;
	103	}
	104
0fb5fe87 RM	105	static inline unsigned long iova_shift(struct iova_domain *iovad)
	106	{
	107	return __ffs(iovad->granule);
	108	}
	109
	110	static inline unsigned long iova_mask(struct iova_domain *iovad)
	111	{
	112	return iovad->granule - 1;
	113	}
	114
	115	static inline size_t iova_offset(struct iova_domain *iovad, dma_addr_t iova)
	116	{
	117	return iova & iova_mask(iovad);
	118	}
	119
	120	static inline size_t iova_align(struct iova_domain *iovad, size_t size)
	121	{
	122	return ALIGN(size, iovad->granule);
	123	}
	124
	125	static inline dma_addr_t iova_dma_addr(struct iova_domain iovad, struct iova iova)
	126	{
	127	return (dma_addr_t)iova->pfn_lo << iova_shift(iovad);
	128	}
	129
	130	static inline unsigned long iova_pfn(struct iova_domain *iovad, dma_addr_t iova)
	131	{
	132	return iova >> iova_shift(iovad);
	133	}
	134
b4d8c7ae	135	#if IS_ENABLED(CONFIG_IOMMU_IOVA)
ae1ff3d6 SA	136	int iova_cache_get(void);
ae1ff3d6 SA	137	void iova_cache_put(void);
85b45456	138
f8de50eb KA	139	struct iova *alloc_iova_mem(void);
	140	void free_iova_mem(struct iova *iova);
	141	void free_iova(struct iova_domain *iovad, unsigned long pfn);
	142	void __free_iova(struct iova_domain iovad, struct iova iova);
	143	struct iova alloc_iova(struct iova_domain iovad, unsigned long size,
f76aec76 KA	144	unsigned long limit_pfn,
f76aec76 KA	145	bool size_aligned);
9257b4a2 OP	146	void free_iova_fast(struct iova_domain *iovad, unsigned long pfn,
9257b4a2 OP	147	unsigned long size);
19282101 JR	148	void queue_iova(struct iova_domain *iovad,
	149	unsigned long pfn, unsigned long pages,
	150	unsigned long data);
9257b4a2 OP	151	unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
9257b4a2 OP	152	unsigned long limit_pfn);
f8de50eb KA	153	struct iova reserve_iova(struct iova_domain iovad, unsigned long pfn_lo,
	154	unsigned long pfn_hi);
	155	void copy_reserved_iova(struct iova_domain from, struct iova_domain to);
0fb5fe87	156	void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
aa3ac946	157	unsigned long start_pfn);
42f87e71 JR	158	int init_iova_flush_queue(struct iova_domain *iovad,
42f87e71 JR	159	iova_flush_cb flush_cb, iova_entry_dtor entry_dtor);
f8de50eb KA	160	struct iova find_iova(struct iova_domain iovad, unsigned long pfn);
f8de50eb KA	161	void put_iova_domain(struct iova_domain *iovad);
75f05569 JL	162	struct iova split_and_remove_iova(struct iova_domain iovad,
75f05569 JL	163	struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
9257b4a2	164	void free_cpu_cached_iovas(unsigned int cpu, struct iova_domain *iovad);
21aff52a TR	165	#else
	166	static inline int iova_cache_get(void)
	167	{
	168	return -ENOTSUPP;
	169	}
	170
	171	static inline void iova_cache_put(void)
	172	{
	173	}
	174
	175	static inline struct iova *alloc_iova_mem(void)
	176	{
	177	return NULL;
	178	}
	179
	180	static inline void free_iova_mem(struct iova *iova)
	181	{
	182	}
	183
	184	static inline void free_iova(struct iova_domain *iovad, unsigned long pfn)
	185	{
	186	}
	187
	188	static inline void __free_iova(struct iova_domain iovad, struct iova iova)
	189	{
	190	}
	191
	192	static inline struct iova alloc_iova(struct iova_domain iovad,
	193	unsigned long size,
	194	unsigned long limit_pfn,
	195	bool size_aligned)
	196	{
	197	return NULL;
	198	}
	199
	200	static inline void free_iova_fast(struct iova_domain *iovad,
	201	unsigned long pfn,
	202	unsigned long size)
	203	{
	204	}
	205
19282101 JR	206	static inline void queue_iova(struct iova_domain *iovad,
	207	unsigned long pfn, unsigned long pages,
	208	unsigned long data)
	209	{
	210	}
	211
21aff52a TR	212	static inline unsigned long alloc_iova_fast(struct iova_domain *iovad,
	213	unsigned long size,
	214	unsigned long limit_pfn)
	215	{
	216	return 0;
	217	}
	218
	219	static inline struct iova reserve_iova(struct iova_domain iovad,
	220	unsigned long pfn_lo,
	221	unsigned long pfn_hi)
	222	{
	223	return NULL;
	224	}
	225
	226	static inline void copy_reserved_iova(struct iova_domain *from,
	227	struct iova_domain *to)
	228	{
	229	}
	230
	231	static inline void init_iova_domain(struct iova_domain *iovad,
	232	unsigned long granule,
aa3ac946	233	unsigned long start_pfn)
21aff52a TR	234	{
	235	}
	236
42f87e71 JR	237	static inline int init_iova_flush_queue(struct iova_domain *iovad,
	238	iova_flush_cb flush_cb,
	239	iova_entry_dtor entry_dtor)
	240	{
	241	return -ENODEV;
	242	}
	243
21aff52a TR	244	static inline struct iova find_iova(struct iova_domain iovad,
	245	unsigned long pfn)
	246	{
	247	return NULL;
	248	}
	249
	250	static inline void put_iova_domain(struct iova_domain *iovad)
	251	{
	252	}
	253
	254	static inline struct iova split_and_remove_iova(struct iova_domain iovad,
	255	struct iova *iova,
	256	unsigned long pfn_lo,
	257	unsigned long pfn_hi)
	258	{
	259	return NULL;
	260	}
	261
	262	static inline void free_cpu_cached_iovas(unsigned int cpu,
	263	struct iova_domain *iovad)
	264	{
	265	}
	266	#endif
f8de50eb KA	267
f8de50eb KA	268	#endif