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swiotlb: dump used and total slots when swiotlb buffer is full

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So far the kernel only prints the requested size if swiotlb buffer if full.
It is not possible to know whether it is simply an out of buffer, or it is
because swiotlb cannot allocate buffer with the requested size due to
fragmentation.

As 'io_tlb_used' is available since commit 71602fe6d4 ("swiotlb: add
debugfs to track swiotlb buffer usage"), both 'io_tlb_used' and
'io_tlb_nslabs' are printed when swiotlb buffer is full.

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Dongli Zhang 2019-04-05 09:15:25 +08:00 committed by Konrad Rzeszutek Wilk
parent 22cb45d769
commit 83ca259489
1 changed files with 2 additions and 1 deletions
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3
kernel/dma/swiotlb.c
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@ -533,7 +533,8 @@ phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
not_found:
spin_unlock_irqrestore(&io_tlb_lock, flags);
if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes)\n", size);
dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes), total %lu, used %lu\n",
size, io_tlb_nslabs, io_tlb_used);
return DMA_MAPPING_ERROR;
found:
io_tlb_used += nslots;