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swiotlb: panic if nslabs is too small

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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) if (swiotlb_force_disable)
return; 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 * By default allocate the bounce buffer memory from low memory, but
* allow to pick a location everywhere for hypervisors with guest * allow to pick a location everywhere for hypervisors with guest
@ -254,7 +257,8 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags,
else else
tlb = memblock_alloc_low(bytes, PAGE_SIZE); tlb = memblock_alloc_low(bytes, PAGE_SIZE);
if (!tlb) { 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; return;
} }