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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2017-03-22 07:21:48 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-03-30 13:42:01 +0300 |
| commit | a540aa56ba3d29084f28710c8b93cc9c3c422943 (patch) | |
| tree | 265e8987fb9f37ede5fb9175dac3e26b62745ed8 /arch/powerpc/include/asm/iommu.h | |
| parent | 6b5c19c55266f6efd10ffac0e9f9f2b7aa420a58 (diff) | |
| download | linux-a540aa56ba3d29084f28710c8b93cc9c3c422943.tar.xz | |
powerpc/powernv/iommu: Add real mode version of iommu_table_ops::exchange()
In real mode, TCE tables are invalidated using special
cache-inhibited store instructions which are not available in
virtual mode
This defines and implements exchange_rm() callback. This does not
define set_rm/clear_rm/flush_rm callbacks as there is no user for those -
exchange/exchange_rm are only to be used by KVM for VFIO.
The exchange_rm callback is defined for IODA1/IODA2 powernv platforms.
This replaces list_for_each_entry_rcu with its lockless version as
from now on pnv_pci_ioda2_tce_invalidate() can be called in
the real mode too.
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>
Diffstat (limited to 'arch/powerpc/include/asm/iommu.h')
| -rw-r--r-- | arch/powerpc/include/asm/iommu.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/iommu.h b/arch/powerpc/include/asm/iommu.h index 2c1d50792944..4554699aec02 100644 --- a/arch/powerpc/include/asm/iommu.h +++ b/arch/powerpc/include/asm/iommu.h @@ -64,6 +64,11 @@ struct iommu_table_ops { long index, unsigned long *hpa, enum dma_data_direction *direction); + /* Real mode */ + int (*exchange_rm)(struct iommu_table *tbl, + long index, + unsigned long *hpa, + enum dma_data_direction *direction); #endif void (*clear)(struct iommu_table *tbl, long index, long npages); @@ -208,6 +213,8 @@ extern void iommu_del_device(struct device *dev); extern int __init tce_iommu_bus_notifier_init(void); extern long iommu_tce_xchg(struct iommu_table *tbl, unsigned long entry, unsigned long *hpa, enum dma_data_direction *direction); +extern long iommu_tce_xchg_rm(struct iommu_table *tbl, unsigned long entry, + unsigned long *hpa, enum dma_data_direction *direction); #else static inline void iommu_register_group(struct iommu_table_group *table_group, int pci_domain_number, |