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powerpc/iommu/ioda2: Add get_table_size() to calculate the size of future table

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This adds a way for the IOMMU user to know how much a new table will
use so it can be accounted in the locked_vm limit before allocation
happens.

This stores the allocated table size in pnv_pci_ioda2_get_table_size()
so the locked_vm counter can be updated correctly when a table is
being disposed.

This defines an iommu_table_group_ops callback to let VFIO know
how much memory will be locked if a table is created.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Alexey Kardashevskiy
2015-06-05 16:35:22 +10:00
committed by Michael Ellerman
parent c035e37b58
commit 0054719386
2 changed files with 39 additions and 0 deletions
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5
arch/powerpc/include/asm/iommu.h
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@@ -99,6 +99,7 @@ struct iommu_table {
unsigned long it_size; /* Size of iommu table in entries */
unsigned long it_indirect_levels;
unsigned long it_level_size;
unsigned long it_allocated_size;
unsigned long it_offset; /* Offset into global table */
unsigned long it_base; /* mapped address of tce table */
unsigned long it_index; /* which iommu table this is */
@@ -147,6 +148,10 @@ extern struct iommu_table *iommu_init_table(struct iommu_table * tbl,
struct iommu_table_group;
struct iommu_table_group_ops {
unsigned long (*get_table_size)(
__u32 page_shift,
__u64 window_size,
__u32 levels);
long (*create_table)(struct iommu_table_group *table_group,
int num,
__u32 page_shift,