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powerpc/powernv: Implement accessor to TCE entry

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This replaces direct accesses to TCE table with a helper which
returns an TCE entry address. This does not make difference now but will
when multi-level TCE tables get introduces.

No change in behavior is expected.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy 2015-06-05 16:35:14 +10:00 committed by Michael Ellerman
parent e57080f17d
commit c5bb44edee
1 changed files with 21 additions and 13 deletions
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34
arch/powerpc/platforms/powernv/pci.c
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@ -572,38 +572,46 @@ struct pci_ops pnv_pci_ops = {
.write = pnv_pci_write_config,
};
static __be64 *pnv_tce(struct iommu_table *tbl, long idx)
{
__be64 *tmp = ((__be64 *)tbl->it_base);
return tmp + idx;
}
int pnv_tce_build(struct iommu_table *tbl, long index, long npages,
unsigned long uaddr, enum dma_data_direction direction,
struct dma_attrs *attrs)
{
u64 proto_tce = iommu_direction_to_tce_perm(direction);
__be64 *tcep;
u64 rpn;
u64 rpn = __pa(uaddr) >> tbl->it_page_shift;
long i;
tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
rpn = __pa(uaddr) >> tbl->it_page_shift;
while (npages--)
*(tcep++) = cpu_to_be64(proto_tce |
(rpn++ << tbl->it_page_shift));
for (i = 0; i < npages; i++) {
unsigned long newtce = proto_tce |
((rpn + i) << tbl->it_page_shift);
unsigned long idx = index - tbl->it_offset + i;
*(pnv_tce(tbl, idx)) = cpu_to_be64(newtce);
}
return 0;
}
void pnv_tce_free(struct iommu_table *tbl, long index, long npages)
{
__be64 *tcep;
long i;
tcep = ((__be64 *)tbl->it_base) + index - tbl->it_offset;
for (i = 0; i < npages; i++) {
unsigned long idx = index - tbl->it_offset + i;
while (npages--)
*(tcep++) = cpu_to_be64(0);
*(pnv_tce(tbl, idx)) = cpu_to_be64(0);
}
}
unsigned long pnv_tce_get(struct iommu_table *tbl, long index)
{
return ((u64 *)tbl->it_base)[index - tbl->it_offset];
return *(pnv_tce(tbl, index - tbl->it_offset));
}
struct iommu_table *pnv_pci_table_alloc(int nid)