From ac2cbab21f318e19bc176a7f38a120cec835220f Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Thu, 24 Jan 2013 12:20:16 -0800 Subject: x86: Don't panic if can not alloc buffer for swiotlb Normal boot path on system with iommu support: swiotlb buffer will be allocated early at first and then try to initialize iommu, if iommu for intel or AMD could setup properly, swiotlb buffer will be freed. The early allocating is with bootmem, and could panic when we try to use kdump with buffer above 4G only, or with memmap to limit mem under 4G. for example: memmap=4095M$1M to remove memory under 4G. According to Eric, add _nopanic version and no_iotlb_memory to fail map single later if swiotlb is still needed. -v2: don't pass nopanic, and use -ENOMEM return value according to Eric. panic early instead of using swiotlb_full to panic...according to Eric/Konrad. -v3: make swiotlb_init to be notpanic, but will affect: arm64, ia64, powerpc, tile, unicore32, x86. -v4: cleanup swiotlb_init by removing swiotlb_init_with_default_size. Suggested-by: Eric W. Biederman Signed-off-by: Yinghai Lu Link: http://lkml.kernel.org/r/1359058816-7615-36-git-send-email-yinghai@kernel.org Reviewed-and-tested-by: Konrad Rzeszutek Wilk Cc: Joerg Roedel Cc: Ralf Baechle Cc: Jeremy Fitzhardinge Cc: Kyungmin Park Cc: Marek Szyprowski Cc: Arnd Bergmann Cc: Andrzej Pietrasiewicz Cc: linux-mips@linux-mips.org Cc: xen-devel@lists.xensource.com Cc: virtualization@lists.linux-foundation.org Cc: Shuah Khan Signed-off-by: H. Peter Anvin --- arch/mips/cavium-octeon/dma-octeon.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/mips/cavium-octeon/dma-octeon.c') diff --git a/arch/mips/cavium-octeon/dma-octeon.c b/arch/mips/cavium-octeon/dma-octeon.c index 41dd00884975..02f244475207 100644 --- a/arch/mips/cavium-octeon/dma-octeon.c +++ b/arch/mips/cavium-octeon/dma-octeon.c @@ -317,7 +317,8 @@ void __init plat_swiotlb_setup(void) octeon_swiotlb = alloc_bootmem_low_pages(swiotlbsize); - swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1); + if (swiotlb_init_with_tbl(octeon_swiotlb, swiotlb_nslabs, 1) == -ENOMEM) + panic("Cannot allocate SWIOTLB buffer"); mips_dma_map_ops = &octeon_linear_dma_map_ops.dma_map_ops; } -- cgit v1.2.3