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swiotlb: checking whether swiotlb buffer is full with io_tlb_used 

This patch uses io_tlb_used to help check whether swiotlb buffer is full.
io_tlb_used is no longer used for only debugfs. It is also used to help
optimize swiotlb_tbl_map_single().

Suggested-by: Joe Jin <joe.jin@oracle.com>
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
hifive-unleashed-5.1
Dongli Zhang 2019-01-18 15:10:28 +08:00 committed by Konrad Rzeszutek Wilk
parent 71602fe6d4
commit 60513ed06a
1 changed files with 4 additions and 0 deletions
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4
kernel/dma/swiotlb.c
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@ -483,6 +483,10 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
* request and allocate a buffer from that IO TLB pool.
*/
spin_lock_irqsave(&io_tlb_lock, flags);
if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
goto not_found;
index = ALIGN(io_tlb_index, stride);
if (index >= io_tlb_nslabs)
index = 0;