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powerpc/dma: remove dma_nommu_mmap_coherent 

The coherent cache version of this function already is functionally
identicall to the default version, and by defining the
arch_dma_coherent_to_pfn hook the same is ture for the noncoherent
version as well.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig 2019-02-13 08:01:24 +01:00 committed by Michael Ellerman
parent 18b53a2d47
commit 6666cc17d7
7 changed files with 6 additions and 28 deletions
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4
arch/powerpc/include/asm/dma-mapping.h
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@ -25,10 +25,6 @@ extern void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
extern void __dma_nommu_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs);
extern int dma_nommu_mmap_coherent(struct device *dev,
struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t handle,
size_t size, unsigned long attrs);
int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction direction,
unsigned long attrs);

1
arch/powerpc/kernel/dma-iommu.c
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@ -167,7 +167,6 @@ u64 dma_iommu_get_required_mask(struct device *dev)
const struct dma_map_ops dma_iommu_ops = {
.alloc = dma_iommu_alloc_coherent,
.free = dma_iommu_free_coherent,
.mmap = dma_nommu_mmap_coherent,
.map_sg = dma_iommu_map_sg,
.unmap_sg = dma_iommu_unmap_sg,
.dma_supported = dma_iommu_dma_supported,

1
arch/powerpc/kernel/dma-swiotlb.c
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@ -34,7 +34,6 @@ unsigned int ppc_swiotlb_enable;
const struct dma_map_ops powerpc_swiotlb_dma_ops = {
.alloc = __dma_nommu_alloc_coherent,
.free = __dma_nommu_free_coherent,
.mmap = dma_nommu_mmap_coherent,
.map_sg = dma_direct_map_sg,
.unmap_sg = dma_direct_unmap_sg,
.dma_supported = swiotlb_dma_supported,

19
arch/powerpc/kernel/dma.c
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@ -114,24 +114,6 @@ void __dma_nommu_free_coherent(struct device *dev, size_t size,
}
#endif /* !CONFIG_NOT_COHERENT_CACHE */
int dma_nommu_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
void *cpu_addr, dma_addr_t handle, size_t size,
unsigned long attrs)
{
unsigned long pfn;
#ifdef CONFIG_NOT_COHERENT_CACHE
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
pfn = __dma_get_coherent_pfn((unsigned long)cpu_addr);
#else
pfn = page_to_pfn(virt_to_page(cpu_addr));
#endif
return remap_pfn_range(vma, vma->vm_start,
pfn + vma->vm_pgoff,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction direction,
unsigned long attrs)
@ -218,7 +200,6 @@ static inline void dma_nommu_sync_single(struct device *dev,
const struct dma_map_ops dma_nommu_ops = {
.alloc = __dma_nommu_alloc_coherent,
.free = __dma_nommu_free_coherent,
.mmap = dma_nommu_mmap_coherent,
.map_sg = dma_nommu_map_sg,
.unmap_sg = dma_nommu_unmap_sg,
.dma_supported = dma_nommu_dma_supported,

7
arch/powerpc/mm/dma-noncoherent.c
View File

@ -30,6 +30,7 @@
#include <linux/types.h>
#include <linux/highmem.h>
#include <linux/dma-direct.h>
#include <linux/dma-noncoherent.h>
#include <linux/export.h>
#include <asm/tlbflush.h>
@ -400,14 +401,16 @@ EXPORT_SYMBOL(__dma_sync_page);
/*
* Return the PFN for a given cpu virtual address returned by
* __dma_nommu_alloc_coherent. This is used by dma_mmap_coherent()
* __dma_nommu_alloc_coherent.
*/
unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr)
long arch_dma_coherent_to_pfn(struct device *dev, void *vaddr,
dma_addr_t dma_addr)
{
/* This should always be populated, so we don't test every
* level. If that fails, we'll have a nice crash which
* will be as good as a BUG_ON()
*/
unsigned long cpu_addr = (unsigned long)vaddr;
pgd_t *pgd = pgd_offset_k(cpu_addr);
pud_t *pud = pud_offset(pgd, cpu_addr);
pmd_t *pmd = pmd_offset(pud, cpu_addr);

1
arch/powerpc/platforms/Kconfig.cputype
View File

@ -402,6 +402,7 @@ config NOT_COHERENT_CACHE
bool
depends on 4xx || PPC_8xx || E200 || PPC_MPC512x || \
GAMECUBE_COMMON || AMIGAONE
select ARCH_HAS_DMA_COHERENT_TO_PFN
default n if PPC_47x
default y

1
arch/powerpc/platforms/pseries/vio.c
View File

@ -603,7 +603,6 @@ static void vio_dma_iommu_unmap_sg(struct device *dev,
static const struct dma_map_ops vio_dma_mapping_ops = {
.alloc = vio_dma_iommu_alloc_coherent,
.free = vio_dma_iommu_free_coherent,
.mmap = dma_nommu_mmap_coherent,
.map_sg = vio_dma_iommu_map_sg,
.unmap_sg = vio_dma_iommu_unmap_sg,
.map_page = vio_dma_iommu_map_page,