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xen/swiotlb: Move the nr_tbl determination in its own function.

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Moving the function out of the way to prepare for the late
SWIOTLB init.

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-08-23 13:55:26 -04:00
parent 74838b7537
commit 1cef36a529
1 changed files with 11 additions and 10 deletions
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21
drivers/xen/swiotlb-xen.c
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@ -144,25 +144,26 @@ xen_swiotlb_fixup(void *buf, size_t size, unsigned long nslabs)
} while (i < nslabs);
return 0;
}
static unsigned long xen_set_nslabs(unsigned long nr_tbl)
{
if (!nr_tbl) {
xen_io_tlb_nslabs = (64 * 1024 * 1024 >> IO_TLB_SHIFT);
xen_io_tlb_nslabs = ALIGN(xen_io_tlb_nslabs, IO_TLB_SEGSIZE);
} else
xen_io_tlb_nslabs = nr_tbl;
return xen_io_tlb_nslabs << IO_TLB_SHIFT;
}
void __init xen_swiotlb_init(int verbose)
{
unsigned long bytes;
int rc = -ENOMEM;
unsigned long nr_tbl;
char *m = NULL;
unsigned int repeat = 3;
nr_tbl = swiotlb_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);
}
xen_io_tlb_nslabs = swiotlb_nr_tbl();
retry:
bytes = xen_io_tlb_nslabs << IO_TLB_SHIFT;
bytes = xen_set_nslabs(xen_io_tlb_nslabs);
/*
* Get IO TLB memory from any location.
*/