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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2011-06-05 11:47:29 +0900
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-06-06 15:41:16 -0400
commit5f98ecdbcef1920323d8777c0ba55dbd4335d3cf (patch)
treed154f6bfe3b4af80ca130328a50004a3ea344c09 /drivers/xen/swiotlb-xen.c
parent61c4f2c81c61f73549928dfd9f3e8f26aa36a8cf (diff)
swiotlb: Export swioltb_nr_tbl and utilize it as appropiate.
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 <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen/swiotlb-xen.c')
-rw-r--r--drivers/xen/swiotlb-xen.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c
index 54469c3eeacd..5ac3f4843f5c 100644
--- a/drivers/xen/swiotlb-xen.c
+++ b/drivers/xen/swiotlb-xen.c
@@ -147,9 +147,15 @@ void __init xen_swiotlb_init(int verbose)
{
unsigned long bytes;
int rc;
-
- xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
- xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
+ unsigned long nr_tbl;
+
+ 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;