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powerpc/iommu: Remove dma_data union 

To support "hybrid" DMA ops in a subsequent patch, we will need both
a direct DMA offset and an iommu pointer. Those are currently exclusive
(a union), so change them to be separate fields.

While there, also type iommu_table_base properly and make exist only
on CONFIG_PPC64 since it's not referenced on 32-bit at all.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Benjamin Herrenschmidt 2015-06-24 15:25:22 +10:00 committed by Michael Ellerman
parent de36953843
commit 2db4928bb5
3 changed files with 36 additions and 14 deletions
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15
arch/powerpc/include/asm/device.h
View File

@ -10,6 +10,7 @@ struct dma_map_ops;
struct device_node;
#ifdef CONFIG_PPC64
struct pci_dn;
struct iommu_table;
#endif
/*
@ -23,13 +24,15 @@ struct dev_archdata {
struct dma_map_ops *dma_ops;
/*
* When an iommu is in use, dma_data is used as a ptr to the base of the
* iommu_table. Otherwise, it is a simple numerical offset.
* These two used to be a union. However, with the hybrid ops we need
* both so here we store both a DMA offset for direct mappings and
* an iommu_table for remapped DMA.
*/
union {
dma_addr_t dma_offset;
void *iommu_table_base;
} dma_data;
dma_addr_t dma_offset;
#ifdef CONFIG_PPC64
struct iommu_table *iommu_table_base;
#endif
#ifdef CONFIG_IOMMU_API
void *iommu_domain;

4
arch/powerpc/include/asm/dma-mapping.h
View File

@ -106,7 +106,7 @@ static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
static inline dma_addr_t get_dma_offset(struct device *dev)
{
if (dev)
return dev->archdata.dma_data.dma_offset;
return dev->archdata.dma_offset;
return PCI_DRAM_OFFSET;
}
@ -114,7 +114,7 @@ static inline dma_addr_t get_dma_offset(struct device *dev)
static inline void set_dma_offset(struct device *dev, dma_addr_t off)
{
if (dev)
dev->archdata.dma_data.dma_offset = off;
dev->archdata.dma_offset = off;
}
/* this will be removed soon */

31
arch/powerpc/include/asm/iommu.h
View File

@ -2,17 +2,17 @@
* Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
* Rewrite, cleanup:
* Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
@ -131,16 +131,21 @@ int get_iommu_order(unsigned long size, struct iommu_table *tbl)
struct scatterlist;
static inline void set_iommu_table_base(struct device *dev, void *base)
#ifdef CONFIG_PPC64
static inline void set_iommu_table_base(struct device *dev,
struct iommu_table *base)
{
dev->archdata.dma_data.iommu_table_base = base;
dev->archdata.iommu_table_base = base;
}
static inline void *get_iommu_table_base(struct device *dev)
{
return dev->archdata.dma_data.iommu_table_base;
return dev->archdata.iommu_table_base;
}
extern int dma_iommu_dma_supported(struct device *dev, u64 mask);
/* Frees table for an individual device node */
extern void iommu_free_table(struct iommu_table *tbl, const char *node_name);
@ -225,6 +230,20 @@ static inline int __init tce_iommu_bus_notifier_init(void)
}
#endif /* !CONFIG_IOMMU_API */
#else
static inline void *get_iommu_table_base(struct device *dev)
{
return NULL;
}
static inline int dma_iommu_dma_supported(struct device *dev, u64 mask)
{
return 0;
}
#endif /* CONFIG_PPC64 */
extern int ppc_iommu_map_sg(struct device *dev, struct iommu_table *tbl,
struct scatterlist *sglist, int nelems,
unsigned long mask,