powerpc/dma: Add optional platform override of dma_set_mask()

Some platforms may want to override dma_set_mask() to take into
account some specific "features" such as the availability of
a direct-map window in addition to an iommu.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/machdep.h b/arch/powerpc/include/asm/machdep.h
index adc8e6cdf33..d045b014553 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -102,6 +102,9 @@ struct machdep_calls {
         void            (*pci_dma_dev_setup)(struct pci_dev *dev);
         void            (*pci_dma_bus_setup)(struct pci_bus *bus);
 
+        /* Platform set_dma_mask override */
+        int             (*dma_set_mask)(struct device *dev, u64 dma_mask);
+
         int             (*probe)(void);
         void            (*setup_arch)(void); /* Optional, may be NULL */
         void            (*init_early)(void);