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authorYasunori Goto <y-goto@jp.fujitsu.com>2005-10-19 15:52:18 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-10-19 23:11:33 -0700
commit281dd25cdc0d6903929b79183816d151ea626341 (patch)
treeed7898462492d853e422eb7f130f0b6e7efc0b69 /arch/ia64/lib
parent51b190b304bbeb1090ba20b0623d39917fa62997 (diff)
downloadop-kernel-dev-281dd25cdc0d6903929b79183816d151ea626341.zip
op-kernel-dev-281dd25cdc0d6903929b79183816d151ea626341.tar.gz
[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>
Diffstat (limited to 'arch/ia64/lib')
-rw-r--r--arch/ia64/lib/swiotlb.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/ia64/lib/swiotlb.c b/arch/ia64/lib/swiotlb.c
index dbc0b3e..a604efc 100644
--- a/arch/ia64/lib/swiotlb.c
+++ b/arch/ia64/lib/swiotlb.c
@@ -123,8 +123,8 @@ swiotlb_init_with_default_size (size_t default_size)
/*
* Get IO TLB memory from the low pages
*/
- io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs *
- (1 << IO_TLB_SHIFT));
+ io_tlb_start = alloc_bootmem_low_pages_limit(io_tlb_nslabs *
+ (1 << IO_TLB_SHIFT), 0x100000000);
if (!io_tlb_start)
panic("Cannot allocate SWIOTLB buffer");
io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT);
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