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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2011-06-05 11:47:29 +0900 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-06-06 15:41:16 -0400 |
| commit | 5f98ecdbcef1920323d8777c0ba55dbd4335d3cf (patch) | |
| tree | d154f6bfe3b4af80ca130328a50004a3ea344c09 /lib/swiotlb.c | |
| parent | 61c4f2c81c61f73549928dfd9f3e8f26aa36a8cf (diff) | |
| download | lwn-5f98ecdbcef1920323d8777c0ba55dbd4335d3cf.tar.gz lwn-5f98ecdbcef1920323d8777c0ba55dbd4335d3cf.zip | |
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/swiotlb.c')
| -rw-r--r-- | lib/swiotlb.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c index 93ca08b8a451..99093b396145 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) |