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swiotlb: Export swioltb_nr_tbl and utilize it as appropiate.

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By default the io_tlb_nslabs is set to zero, and gets set to
whatever value is passed in via swiotlb_init_with_tbl function.
The default value passed in is 64MB. However, if the user provides
the 'swiotlb=<nslabs>' the default value is ignored and
the value provided by the user is used... Except when the SWIOTLB
is used under Xen - there the default value of 64MB is used and
the Xen-SWIOTLB has no mechanism to get the 'io_tlb_nslabs' filled
out by setup_io_tlb_npages functions. This patch provides a function
for the Xen-SWIOTLB to call to see if the io_tlb_nslabs is set
and if so use that value.

Signed-off-by: FUJITA Tomonori <[email protected]>
Signed-off-by: Konrad Rzeszutek Wilk <[email protected]>
This commit is contained in:
FUJITA Tomonori 2011-06-05 11:47:29 +09:00 • committed by Konrad Rzeszutek Wilk
commit 5f98ecdbce
3 changed files with 15 additions and 3 deletions
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10
drivers/xen/swiotlb-xen.c
View file

@ -147,9 +147,15 @@ void __init xen_swiotlb_init(int verbose)
{
unsigned long bytes;
int rc;
unsigned long nr_tbl;
xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
nr_tbl = swioltb_nr_tbl();
if (nr_tbl)
xen_io_tlb_nslabs = nr_tbl;
else {
xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
}
bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;