set up dma_ops appropriately

This patch introduces a global pointer, dma_ops, which points to an
appropriate dma_mapping_ops that the kernel should use. This is a
common way to handle multiple dma_mapping_ops (X86, POWER, and SPARC).

dma_ops is set in platform_dma_init. We also set it by hand where
machvec_init is callev via subsys_initcall.

- IA64_DIG_VTD uses vtd_dma_ops.
- IA64_HP_ZX1 uses sba_dma_ops.
- IA64_HP_ZX1_SWIOTLB uses hwsw_dma_ops.
- IA64_SGI_SN2 uses sn_dma_ops.
- The rest use swiotlb_dma_ops.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 1 deletions

diff --git a/arch/ia64/include/asm/machvec_sn2.h b/arch/ia64/include/asm/machvec_sn2.h
index 781308ea7b88..c1f6f871da81 100644
--- a/arch/ia64/include/asm/machvec_sn2.h
+++ b/arch/ia64/include/asm/machvec_sn2.h
@@ -55,6 +55,7 @@ extern ia64_mv_readb_t __sn_readb_relaxed;
 extern ia64_mv_readw_t __sn_readw_relaxed;
 extern ia64_mv_readl_t __sn_readl_relaxed;
 extern ia64_mv_readq_t __sn_readq_relaxed;
+extern ia64_mv_dma_init                 sn_dma_init;
 extern ia64_mv_dma_alloc_coherent       sn_dma_alloc_coherent;
 extern ia64_mv_dma_free_coherent        sn_dma_free_coherent;
 extern ia64_mv_dma_map_single_attrs     sn_dma_map_single_attrs;
@@ -110,7 +111,7 @@ extern ia64_mv_pci_fixup_bus_t		sn_pci_fixup_bus;
 #define platform_pci_get_legacy_mem     sn_pci_get_legacy_mem
 #define platform_pci_legacy_read        sn_pci_legacy_read
 #define platform_pci_legacy_write       sn_pci_legacy_write
-#define platform_dma_init               machvec_noop
+#define platform_dma_init               sn_dma_init
 #define platform_dma_alloc_coherent     sn_dma_alloc_coherent
 #define platform_dma_free_coherent      sn_dma_free_coherent
 #define platform_dma_map_single_attrs   sn_dma_map_single_attrs