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authorChristoph Hellwig <hch@lst.de>2019-08-26 09:03:44 +0200
committerChristoph Hellwig <hch@lst.de>2019-08-29 16:43:22 +0200
commit419e2f1838819e954071dfa1d1f820ab3386ada1 (patch)
tree5ef040344115ef0a0bbf30461668f5d831fecf2e /kernel/dma/Kconfig
parentb898e50f9f49f7d90f3bca94ac046145072034a2 (diff)
dma-mapping: remove arch_dma_mmap_pgprot
arch_dma_mmap_pgprot is used for two things: 1) to override the "normal" uncached page attributes for mapping memory coherent to devices that can't snoop the CPU caches 2) to provide the special DMA_ATTR_WRITE_COMBINE semantics on older arm systems and some mips platforms Replace one with the pgprot_dmacoherent macro that is already provided by arm and much simpler to use, and lift the DMA_ATTR_WRITE_COMBINE handling to common code with an explicit arch opt-in. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k Acked-by: Paul Burton <paul.burton@mips.com> # mips
Diffstat (limited to 'kernel/dma/Kconfig')
-rw-r--r--kernel/dma/Kconfig12
1 files changed, 9 insertions, 3 deletions
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 9decbba255fc..73c5c2b8e824 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -20,6 +20,15 @@ config ARCH_HAS_DMA_COHERENCE_H
config ARCH_HAS_DMA_SET_MASK
bool
+#
+# Select this option if the architecture needs special handling for
+# DMA_ATTR_WRITE_COMBINE. Normally the "uncached" mapping should be what
+# people thing of when saying write combine, so very few platforms should
+# need to enable this.
+#
+config ARCH_HAS_DMA_WRITE_COMBINE
+ bool
+
config DMA_DECLARE_COHERENT
bool
@@ -45,9 +54,6 @@ config ARCH_HAS_DMA_PREP_COHERENT
config ARCH_HAS_DMA_COHERENT_TO_PFN
bool
-config ARCH_HAS_DMA_MMAP_PGPROT
- bool
-
config ARCH_HAS_FORCE_DMA_UNENCRYPTED
bool