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27 March 2024, 02:37:15 UTC
Revision 281dd25cdc0d6903929b79183816d151ea626341 authored by Yasunori Goto on 19 October 2005, 22:52:18 UTC, committed by Linus Torvalds on 20 October 2005, 06:11:33 UTC 
[PATCH] swiotlb: make sure initial DMA allocations really are in DMA memory
 
This introduces a limit parameter to the core bootmem allocator; The new
parameter indicates that physical memory allocated by the bootmem
allocator should be within the requested limit.

We also introduce alloc_bootmem_low_pages_limit, alloc_bootmem_node_limit,
alloc_bootmem_low_pages_node_limit apis, but alloc_bootmem_low_pages_limit
is the only api used for swiotlb.

The existing alloc_bootmem_low_pages() api could instead have been
changed and made to pass right limit to the core allocator.  But that
would make the patch more intrusive for 2.6.14, as other arches use
alloc_bootmem_low_pages().  We may be done that post 2.6.14 as a
cleanup.

With this, swiotlb gets memory within 4G for both x86_64 and ia64
arches.

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Ravikiran G Thirumalai <kiran@scalex86.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
1 parent 51b190b
History
Tip revision: 281dd25cdc0d6903929b79183816d151ea626341 authored by Yasunori Goto on 19 October 2005, 22:52:18 UTC
[PATCH] swiotlb: make sure initial DMA allocations really are in DMA memory
Tip revision: 281dd25
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