166 lines
4.1 KiB
C
166 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* Copyright (c) 2006, Intel Corporation.
|
|
*
|
|
* 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/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_rcache;
|
|
|
|
/* 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;
|
|
unsigned long max32_alloc_size; /* Size of last failed allocation */
|
|
struct iova anchor; /* rbtree lookup anchor */
|
|
|
|
struct iova_rcache *rcaches;
|
|
struct hlist_node cpuhp_dead;
|
|
};
|
|
|
|
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_REACHABLE(CONFIG_IOMMU_IOVA)
|
|
int iova_cache_get(void);
|
|
void iova_cache_put(void);
|
|
|
|
unsigned long iova_rcache_range(void);
|
|
|
|
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);
|
|
unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size,
|
|
unsigned long limit_pfn, bool flush_rcache);
|
|
struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
|
|
unsigned long pfn_hi);
|
|
void init_iova_domain(struct iova_domain *iovad, unsigned long granule,
|
|
unsigned long start_pfn);
|
|
int iova_domain_init_rcaches(struct iova_domain *iovad);
|
|
struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
|
|
void put_iova_domain(struct iova_domain *iovad);
|
|
#else
|
|
static inline int iova_cache_get(void)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline void iova_cache_put(void)
|
|
{
|
|
}
|
|
|
|
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 unsigned long alloc_iova_fast(struct iova_domain *iovad,
|
|
unsigned long size,
|
|
unsigned long limit_pfn,
|
|
bool flush_rcache)
|
|
{
|
|
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 init_iova_domain(struct iova_domain *iovad,
|
|
unsigned long granule,
|
|
unsigned long start_pfn)
|
|
{
|
|
}
|
|
|
|
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)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|