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powerpc/dma: remove dma_nommu_mmap_coherent

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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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7
arch/powerpc/mm/dma-noncoherent.c
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@@ -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);