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authorDongli Zhang <dongli.zhang@oracle.com>2022-06-11 01:25:14 -0700
committerChristoph Hellwig <hch@lst.de>2022-06-22 12:42:09 +0200
commit0bf28fc40d89b1a3e00d1b79473bad4e9ca20ad1 (patch)
tree8905b87243769254b100497f5aa3b506cf4460cf /kernel/dma
parent04c14e8e38b06edf934e9bb0cc504afd94d593fb (diff)
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>
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/swiotlb.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index fd21f4162f4b..1758b724c7a8 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -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;
}