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powerpc/dma: split the two __dma_alloc_coherent implementations

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The implemementation for the CONFIG_NOT_COHERENT_CACHE case doesn't share
any code with the one for systems with coherent caches.  Split it off
and merge it with the helpers in dma-noncoherent.c that have no other
callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christoph Hellwig 2018-12-16 18:19:50 +01:00 committed by Michael Ellerman
parent 9c15a87cfc
commit 44a0337b32
4 changed files with 10 additions and 26 deletions
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5
arch/powerpc/include/asm/dma-mapping.h
View File

@ -39,9 +39,6 @@ extern int dma_nommu_mmap_coherent(struct device *dev,
* to ensure it is consistent.
*/
struct device;
extern void *__dma_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *handle, gfp_t gfp);
extern void __dma_free_coherent(size_t size, void *vaddr);
extern void __dma_sync(void *vaddr, size_t size, int direction);
extern void __dma_sync_page(struct page *page, unsigned long offset,
size_t size, int direction);
@ -52,8 +49,6 @@ extern unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr);
* Cache coherent cores.
*/
#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) ((void)0)
#define __dma_sync(addr, size, rw) ((void)0)
#define __dma_sync_page(pg, off, sz, rw) ((void)0)

14
arch/powerpc/kernel/dma.c
View File

@ -62,18 +62,12 @@ static int dma_nommu_dma_supported(struct device *dev, u64 mask)
#endif
}
#ifndef CONFIG_NOT_COHERENT_CACHE
void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,
unsigned long attrs)
{
void *ret;
#ifdef CONFIG_NOT_COHERENT_CACHE
ret = __dma_alloc_coherent(dev, size, dma_handle, flag);
if (ret == NULL)
return NULL;
*dma_handle += get_dma_offset(dev);
return ret;
#else
struct page *page;
int node = dev_to_node(dev);
#ifdef CONFIG_FSL_SOC
@ -113,19 +107,15 @@ void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
*dma_handle = __pa(ret) + get_dma_offset(dev);
return ret;
#endif
}
void __dma_nommu_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs)
{
#ifdef CONFIG_NOT_COHERENT_CACHE
__dma_free_coherent(size, vaddr);
#else
free_pages((unsigned long)vaddr, get_order(size));
#endif
}
#endif /* !CONFIG_NOT_COHERENT_CACHE */
static void *dma_nommu_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag,

15
arch/powerpc/mm/dma-noncoherent.c
View File

@ -29,7 +29,7 @@
#include <linux/string.h>
#include <linux/types.h>
#include <linux/highmem.h>
#include <linux/dma-mapping.h>
#include <linux/dma-direct.h>
#include <linux/export.h>
#include <asm/tlbflush.h>
@ -151,8 +151,8 @@ static struct ppc_vm_region *ppc_vm_region_find(struct ppc_vm_region *head, unsi
* Allocate DMA-coherent memory space and return both the kernel remapped
* virtual and bus address for that space.
*/
void *
__dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
void *__dma_nommu_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
{
struct page *page;
struct ppc_vm_region *c;
@ -223,7 +223,7 @@ __dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t
/*
* Set the "dma handle"
*/
*handle = page_to_phys(page);
*dma_handle = phys_to_dma(dev, page_to_phys(page));
do {
SetPageReserved(page);
@ -249,12 +249,12 @@ __dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t
no_page:
return NULL;
}
EXPORT_SYMBOL(__dma_alloc_coherent);
/*
* free a page as defined by the above mapping.
*/
void __dma_free_coherent(size_t size, void *vaddr)
void __dma_nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
dma_addr_t dma_handle, unsigned long attrs)
{
struct ppc_vm_region *c;
unsigned long flags, addr;
@ -309,7 +309,6 @@ void __dma_free_coherent(size_t size, void *vaddr)
__func__, vaddr);
dump_stack();
}
EXPORT_SYMBOL(__dma_free_coherent);
/*
* make an area consistent.
@ -401,7 +400,7 @@ EXPORT_SYMBOL(__dma_sync_page);
/*
* Return the PFN for a given cpu virtual address returned by
* __dma_alloc_coherent. This is used by dma_mmap_coherent()
* __dma_nommu_alloc_coherent. This is used by dma_mmap_coherent()
*/
unsigned long __dma_get_coherent_pfn(unsigned long cpu_addr)
{

2
arch/powerpc/platforms/44x/warp.c
View File

@ -47,7 +47,7 @@ static int __init warp_probe(void)
if (!of_machine_is_compatible("pika,warp"))
return 0;
/* For __dma_alloc_coherent */
/* For __dma_nommu_alloc_coherent */
ISA_DMA_THRESHOLD = ~0L;
return 1;