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iommu/iova: Implement Flush-Queue ring buffer

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Add a function to add entries to the Flush-Queue ring
buffer. If the buffer is full, call the flush-callback and
free the entries.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel
2017-08-10 15:49:44 +02:00
parent 42f87e71c3
commit 1928210107
2 changed files with 89 additions and 0 deletions
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9
include/linux/iova.h
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@@ -127,6 +127,9 @@ struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
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,
@@ -182,6 +185,12 @@ static inline void free_iova_fast(struct iova_domain *iovad,
{
}
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)