Commit 0bf28fc4 authored by Dongli Zhang's avatar Dongli Zhang Committed by Christoph Hellwig
Browse files

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: default avatarDongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 04c14e8e

kernel/dma/swiotlb.c

+5 −1
Original line number Diff line number Diff line
@@ -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 @@ void __init swiotlb_init_remap(bool addressing_limit, unsigned int flags, 
	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;

	}