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authorPetr Tesarik <petr.tesarik1@huawei-partners.com>2023-10-25 10:44:25 +0200
committerChristoph Hellwig <hch@lst.de>2023-10-25 16:26:20 +0200
commitd5090484b021794271280ab64d20253883b7f6fd (patch)
tree972e92c18aa040f2fd8040f22229fe07e2b25e74 /kernel/dma
parent4f82870119a46b0d04d91ef4697ac4977a255a9d (diff)
swiotlb: do not try to allocate a TLB bigger than MAX_ORDER pages
When allocating a new pool at runtime, reduce the number of slabs so that the allocation order is at most MAX_ORDER. This avoids a kernel warning in __alloc_pages(). The warning is relatively benign, because the pool size is subsequently reduced when allocation fails, but it is silly to start with a request that is known to fail, especially since this is the default behavior if the kernel is built with CONFIG_SWIOTLB_DYNAMIC=y and booted without any swiotlb= parameter. Reported-by: Ben Greear <greearb@candelatech.com> Closes: https://lore.kernel.org/netdev/4f173dd2-324a-0240-ff8d-abf5c191be18@candelatech.com/ Fixes: 1aaa736815eb ("swiotlb: allocate a new memory pool when existing pools are full") Signed-off-by: Petr Tesarik <petr.tesarik1@huawei-partners.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/swiotlb.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 01637677736f..dff067bd56b1 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -678,6 +678,11 @@ static struct io_tlb_pool *swiotlb_alloc_pool(struct device *dev,
size_t pool_size;
size_t tlb_size;
+ if (nslabs > SLABS_PER_PAGE << MAX_ORDER) {
+ nslabs = SLABS_PER_PAGE << MAX_ORDER;
+ nareas = limit_nareas(nareas, nslabs);
+ }
+
pool_size = sizeof(*pool) + array_size(sizeof(*pool->areas), nareas);
pool = kzalloc(pool_size, gfp);
if (!pool)