On Fri, 2015-08-07 at 13:45 +1000, Andrew Donnellan wrote:
> Simplify the dma_get_required_mask call chain by moving it from pnv_phb to
> pci_controller_ops, similar to commit 763d2d8df1ee2b92ff09c
> ("powerpc/powernv: Move dma_set_mask from pnv_phb to pci_controller_ops").
>
> Previous call chain:
>
> 0) call dma_get_required_mask() (kernel/dma.c)
> 1) call ppc_md.dma_get_required_mask, if it exists. On powernv, that
> points to pnv_dma_get_required_mask() (platforms/powernv/setup.c)
> 2) device is PCI, therefore call pnv_pci_dma_get_required_mask()
> (platforms/powernv/pci.c)
> 3) call phb->dma_get_required_mask if it exists
> 4) it only exists in the ioda case, where it points to
> pnv_pci_ioda_dma_get_required_mask() (platforms/powernv/pci-ioda.c)
>
> New call chain:
>
> 0) call dma_get_required_mask() (kernel/dma.c)
> 1) device is PCI, therefore call pci_controller_ops.dma_get_required_mask
> if it exists
> 2) in the ioda case, that points to pnv_pci_ioda_dma_get_required_mask()
> (platforms/powernv/pci-ioda.c)
>
> In the p5ioc2 case, the call chain remains the same -
> dma_get_required_mask() does not find either a ppc_md call or
> pci_controller_ops call, so it calls __dma_get_required_mask().
>
> Signed-off-by: Andrew Donnellan <[email protected]>
>
Reviewed-by: Daniel Axtens <[email protected]>-- Regards, Daniel
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