git/linux-cryptodev-2.6
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/herbert/cryptodev-2.6.git synced 2026-05-02 18:17:50 -04:00
Code Issues Packages Projects Releases Wiki Activity

dma-mapping: consolidate the dma mmap implementations

Browse Source 
The only functional differences (modulo a few missing fixes in the arch
code) is that architectures without coherent caches need a hook to
convert a virtual or dma address into a pfn, given that we don't have
the kernel linear mapping available for the otherwise easy virt_to_page
call.  As a side effect we can support mmap of the per-device coherent
area even on architectures not providing the callback, and we make
previous dangerous default methods dma_common_mmap actually save for
non-coherent architectures by rejecting it without the right helper.

In addition to that we need a hook so that some architectures can
override the protection bits when mmaping a dma coherent allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Paul Burton <paul.burton@mips.com> # MIPS parts
This commit is contained in:
Christoph Hellwig
2018-09-11 08:55:28 +02:00
parent bc3ec75de5
commit 58b0440663
16 changed files with 59 additions and 107 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/mips/Kconfig
View File

@@ -1116,10 +1116,11 @@ config DMA_PERDEV_COHERENT
config DMA_NONCOHERENT
bool
select ARCH_HAS_DMA_MMAP_PGPROT
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
select ARCH_HAS_SYNC_DMA_FOR_CPU
select NEED_DMA_MAP_STATE
select DMA_NONCOHERENT_MMAP
select ARCH_HAS_DMA_COHERENT_TO_PFN
select DMA_NONCOHERENT_CACHE_SYNC
config SYS_HAS_EARLY_PRINTK