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powerpc: use the generic dma coherent remap allocator

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This switches to using common code for the DMA allocations, including
potential use of the CMA allocator if configured.

Switching to the generic code enables DMA allocations from atomic
context, which is required by the DMA API documentation, and also
adds various other minor features drivers start relying upon.  It
also makes sure we have on tested code base for all architectures
that require uncached pte bits for coherent DMA allocations.

Another advantage is that consistent memory allocations now share
the general vmalloc pool instead of needing an explicit careout
from it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christophe Leroy <christophe.leroy@c-s.fr> # tested on 8xx
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190814132230.31874-2-hch@lst.de
This commit is contained in:
Christoph Hellwig
2019-08-14 15:22:30 +02:00
committed by Michael Ellerman
parent 555e28179d
commit f2902a2fb4
7 changed files with 17 additions and 352 deletions
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12
arch/powerpc/include/asm/book3s/32/pgtable.h
View File

@@ -148,21 +148,15 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
*/
#include <asm/fixmap.h>
#ifdef CONFIG_HIGHMEM
#define KVIRT_TOP PKMAP_BASE
#else
#define KVIRT_TOP FIXADDR_START
#endif
/*
* ioremap_bot starts at that address. Early ioremaps move down from there,
* until mem_init() at which point this becomes the top of the vmalloc
* and ioremap space
*/
#ifdef CONFIG_NOT_COHERENT_CACHE
#define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK)
#ifdef CONFIG_HIGHMEM
#define IOREMAP_TOP PKMAP_BASE
#else
#define IOREMAP_TOP KVIRT_TOP
#define IOREMAP_TOP FIXADDR_START
#endif
/* PPC32 shares vmalloc area with ioremap */

12
arch/powerpc/include/asm/nohash/32/pgtable.h
View File

@@ -76,21 +76,15 @@ int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
*/
#include <asm/fixmap.h>
#ifdef CONFIG_HIGHMEM
#define KVIRT_TOP PKMAP_BASE
#else
#define KVIRT_TOP FIXADDR_START
#endif
/*
* ioremap_bot starts at that address. Early ioremaps move down from there,
* until mem_init() at which point this becomes the top of the vmalloc
* and ioremap space
*/
#ifdef CONFIG_NOT_COHERENT_CACHE
#define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK)
#ifdef CONFIG_HIGHMEM
#define IOREMAP_TOP PKMAP_BASE
#else
#define IOREMAP_TOP KVIRT_TOP
#define IOREMAP_TOP FIXADDR_START
#endif
/* PPC32 shares vmalloc area with ioremap */