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swiotlb: Use page alignment for early buffer allocation 

We could call free_bootmem_late() if swiotlb is not used, and
it will shrink to page alignment.

So alloc them with page alignment at first, to avoid lose two pages

before patch:
[    0.000000]     memblock_x86_reserve_range: [00d3600000, 00d7600000]   swiotlb buffer
[    0.000000]     memblock_x86_reserve_range: [00d7e7ef40, 00d7e9ef40]     swiotlb list
[    0.000000]     memblock_x86_reserve_range: [00d7e3ef40, 00d7e7ef40]  swiotlb orig_ad
[    0.000000]     memblock_x86_reserve_range: [000008a000, 0000092000]  swiotlb overflo

after patch will get
[    0.000000]     memblock_x86_reserve_range: [00d3600000, 00d7600000]   swiotlb buffer
[    0.000000]     memblock_x86_reserve_range: [00d7e7e000, 00d7e9e000]     swiotlb list
[    0.000000]     memblock_x86_reserve_range: [00d7e3e000, 00d7e7e000]  swiotlb orig_ad
[    0.000000]     memblock_x86_reserve_range: [000008a000, 0000092000]  swiotlb overflo

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Yinghai Lu 2010-10-11 10:40:25 -07:00 committed by Konrad Rzeszutek Wilk
parent 03620b2d75
commit e79f86b2ef
1 changed files with 8 additions and 8 deletions
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16
lib/swiotlb.c
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@ -147,16 +147,16 @@ void __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
* to find contiguous free memory regions of size up to IO_TLB_SEGSIZE
* between io_tlb_start and io_tlb_end.
*/
io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int));
io_tlb_list = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
for (i = 0; i < io_tlb_nslabs; i++)
io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE);
io_tlb_index = 0;
io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(phys_addr_t));
io_tlb_orig_addr = alloc_bootmem_pages(PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
/*
* Get the overflow emergency buffer
*/
io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow);
io_tlb_overflow_buffer = alloc_bootmem_low_pages(PAGE_ALIGN(io_tlb_overflow));
if (!io_tlb_overflow_buffer)
panic("Cannot allocate SWIOTLB overflow buffer!\n");
if (verbose)
@ -182,7 +182,7 @@ swiotlb_init_with_default_size(size_t default_size, int verbose)
/*
* Get IO TLB memory from the low pages
*/
io_tlb_start = alloc_bootmem_low_pages(bytes);
io_tlb_start = alloc_bootmem_low_pages(PAGE_ALIGN(bytes));
if (!io_tlb_start)
panic("Cannot allocate SWIOTLB buffer");
@ -308,13 +308,13 @@ void __init swiotlb_free(void)
get_order(io_tlb_nslabs << IO_TLB_SHIFT));
} else {
free_bootmem_late(__pa(io_tlb_overflow_buffer),
io_tlb_overflow);
PAGE_ALIGN(io_tlb_overflow));
free_bootmem_late(__pa(io_tlb_orig_addr),
io_tlb_nslabs * sizeof(phys_addr_t));
PAGE_ALIGN(io_tlb_nslabs * sizeof(phys_addr_t)));
free_bootmem_late(__pa(io_tlb_list),
io_tlb_nslabs * sizeof(int));
PAGE_ALIGN(io_tlb_nslabs * sizeof(int)));
free_bootmem_late(__pa(io_tlb_start),
io_tlb_nslabs << IO_TLB_SHIFT);
PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT));
}
}