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| author | Vladimir Murzin <vladimir.murzin@arm.com> | 2017-06-28 12:16:57 +0300 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2017-06-30 20:03:07 +0300 |
| commit | 07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf (patch) | |
| tree | 463fc188df21de87c3cef87b4eab54438805c86e /drivers/base | |
| parent | 93228b44c33a572cb36cec2dbed42e9bdbc88d79 (diff) | |
| download | linux-07c75d7a6b9eae24ab72c6eb2fbd39963775b0bf.tar.xz | |
drivers: dma-mapping: allow dma_common_mmap() for NOMMU
Currently, internals of dma_common_mmap() is compiled out if build is
done for either NOMMU or target which explicitly says it does not
have/want coherent DMA mmap. It turned out that dma_common_mmap() can
be handy in NOMMU setup (at least for ARM).
This patch converts exitent NOMMU targets to use ARCH_NO_COHERENT_DMA_MMAP,
thus when CONFIG_MMU is gone from dma_common_mmap() their behaviour stays
unchanged.
ARM is not converted to ARCH_NO_COHERENT_DMA_MMAP because it 1)
already has mmap callback which can handle (at some extent) NOMMU 2)
already defines dummy pgprot_noncached() for NOMMU build.
c6x and frv stay untouched since they already have ARCH_NO_COHERENT_DMA_MMAP.
Cc: Steven Miao <realmz6@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Tested-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/dma-mapping.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index 10e7c022e8cf..ce1e02b567c3 100644 --- a/drivers/base/dma-mapping.c +++ b/drivers/base/dma-mapping.c @@ -227,7 +227,7 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size) { int ret = -ENXIO; -#if defined(CONFIG_MMU) && !defined(CONFIG_ARCH_NO_COHERENT_DMA_MMAP) +#ifndef CONFIG_ARCH_NO_COHERENT_DMA_MMAP unsigned long user_count = vma_pages(vma); unsigned long count = PAGE_ALIGN(size) >> PAGE_SHIFT; unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); @@ -244,7 +244,7 @@ int dma_common_mmap(struct device *dev, struct vm_area_struct *vma, user_count << PAGE_SHIFT, vma->vm_page_prot); } -#endif /* CONFIG_MMU && !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ +#endif /* !CONFIG_ARCH_NO_COHERENT_DMA_MMAP */ return ret; } |