include/linux/iova.h

Source file repositories/reference/linux-study-clean/include/linux/iova.h

File Facts

System
Linux kernel
Corpus path
include/linux/iova.h
Extension
.h
Size
4303 bytes
Lines
171
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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 size_t iova_align_down(struct iova_domain *iovad, size_t size)
{
	return ALIGN_DOWN(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)
{

Annotation

Implementation Notes