Re: [RFCv3][PATCH 3/5] arm64: Implement ARCH_HAS_FORCE_CACHE

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 09/13/2016 02:19 AM, Will Deacon wrote:
Hi Laura,

On Mon, Sep 12, 2016 at 02:32:56PM -0700, Laura Abbott wrote:

arm64 may need to guarantee the caches are synced. Implement versions of
the kernel_force_cache API to allow this.

Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
---
v3: Switch to calling cache operations directly instead of relying on
DMA mapping.
---
 arch/arm64/include/asm/cacheflush.h |  8 ++++++++
 arch/arm64/mm/cache.S               | 24 ++++++++++++++++++++----
 arch/arm64/mm/flush.c               | 11 +++++++++++
 3 files changed, 39 insertions(+), 4 deletions(-)

I'm really hesitant to expose these cache routines as an API solely to
support a driver sitting in staging/. I appreciate that there's a chicken
and egg problem here, but we *really* don't want people using these routines
in preference to the DMA API, and I fear that we'll simply grow a bunch
more users of these things if we promote it as an API like you're proposing.

Can the code not be contained under staging/, as part of ion?


I proposed that in V1 and it was suggested I make it a proper API

http://www.mail-archive.com/driverdev-devel@xxxxxxxxxxxxxxxxxxxxxx/msg47654.html
http://www.mail-archive.com/driverdev-devel@xxxxxxxxxxxxxxxxxxxxxx/msg47672.html

Will


Thanks,
Laura

_______________________________________________
devel mailing list
devel@xxxxxxxxxxxxxxxxxxxxxx
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel



[Index of Archives]     [Linux Driver Backports]     [DMA Engine]     [Linux GPIO]     [Linux SPI]     [Video for Linux]     [Linux USB Devel]     [Linux Coverity]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux