Ravikiran G Thirumalai <[email protected]> wrote:
>
> On x86_64 NUMA boxes, the revert
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6e3254c4e2927c117044a02acf5f5b56e1373053
> meant that swiotlb gets the IOTLB
> memory from pages over 4G (if mem > 4G), which basically renders swiotlb useless, causing
> breakage with devices not capable of DMA beyond 4G. 2.6.13 was (kinda) not
> broken, although the patch titled "Reverse order of bootmem lists" was
> not in 2.6.13, The reason is commit
> http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=6142891a0c0209c91aa4a98f725de0d6e2ed4918
> was not in 2.6.13, PCI_DMA_BUS_IS_PHYS was 1 when no mmu was present, and the block layer did
> the bouncing, never using swiotlb. I guess the right fix is to make sure
> swiotlb gets the right memory. Here is a patch doing that. Tested on IBM
> x460. I hope the patch is ok for ia64s too. I do not have access to ia64
> boxen.
>
This is an ia64 patch - what point was there in testing it on an x460?
Is something missing here?
>
> Index: linux-2.6.14-rc4/arch/ia64/lib/swiotlb.c
> ===================================================================
> --- linux-2.6.14-rc4.orig/arch/ia64/lib/swiotlb.c 2005-10-14 00:06:21.000000000 -0700
> +++ linux-2.6.14-rc4/arch/ia64/lib/swiotlb.c 2005-10-17 00:05:22.000000000 -0700
> @@ -123,7 +123,7 @@
> /*
> * Get IO TLB memory from the low pages
> */
> - io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs *
> + io_tlb_start = alloc_bootmem_node(NODE_DATA(0), io_tlb_nslabs *
> (1 << IO_TLB_SHIFT));
> if (!io_tlb_start)
> panic("Cannot allocate SWIOTLB buffer");
-
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