path: root/lib
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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 /lib
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 'lib')
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index 93ca08b8a45..99093b39614 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -110,6 +110,11 @@ setup_io_tlb_npages(char *str)
__setup("swiotlb=", setup_io_tlb_npages);
/* make io_tlb_overflow tunable too? */
+unsigned long swioltb_nr_tbl(void)
+ return io_tlb_nslabs;
/* Note that this doesn't work with highmem page */
static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
volatile void *address)