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swiotlb: panic if nslabs is too small 

Panic on purpose if nslabs is too small, in order to sync with the remap
retry logic.

In addition, print the number of bytes for tlb alloc failure.

Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dongli Zhang 2022-06-11 01:25:14 -07:00 committed by Christoph Hellwig
parent 04c14e8e38
commit 0bf28fc40d
1 changed files with 5 additions and 1 deletions
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6
kernel/dma/swiotlb.c
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@ -242,6 +242,9 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
if (swiotlb_force_disable)
return;
if (nslabs < IO_TLB_MIN_SLABS)
panic("%s: nslabs = %lu too small\n", __func__, nslabs);
/*
* By default allocate the bounce buffer memory from low memory, but
* allow to pick a location everywhere for hypervisors with guest
@ -254,7 +257,8 @@ retry:
else
tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb) {
pr_warn("%s: failed to allocate tlb structure\n", __func__);
pr_warn("%s: Failed to allocate %zu bytes tlb structure\n",
__func__, bytes);
return;
}