Re: [PATCH v4 0/3] Use dma_default_coherent for devicetree default coherency

Jiaxun Yang
2023-04-06T07:12:31Z

> 2023年4月1日 10:15，Jiaxun Yang <jiaxun.yang@flygoat.com> 写道：
>
> Hi all,
>
> This series split out second half of my previous series
> "[PATCH 0/4] MIPS DMA coherence fixes".
>
> It intends to use dma_default_coherent to determine the default coherency of
> devicetree probed devices instead of hardcoding it with Kconfig options.
>
> For some MIPS systems, dma_default_coherent is determined with either
> bootloader or hardware registers in platform initilization code, and devicetree
> does not explicility specify the coherency of the device, so we need the ability
> to change the default coherency of devicetree probed devices.
>
> For other platforms that supports noncoherent, dma_default_coherent is a fixed
> value set by arch code. It's defaulted to false for most archs except RISC-V
> and powerpc in some cases.

Ping.

Is there any issue remain in this series?

Thanks
Jiaxun

>
> Thanks
> - Jiaxun
> ---
> v2:
> - Add PATCH 1 to help with backporting
> - Use Kconfig option to set dma_default_coherent
>
> v3:
> - Style fixes
> - Squash setting ARCH_DMA_DEFAULT_COHERENT into PATCH 4
> - Setting ARCH_DMA_DEFAULT_COHERENT for PowerPC
>
> v4:
> - Drop first patch
>
> Jiaxun Yang (3):
> dma-mapping: Provide a fallback dma_default_coherent
> dma-mapping: Provide CONFIG_ARCH_DMA_DEFAULT_COHERENT
> of: address: Always use dma_default_coherent for default coherency
>
> arch/powerpc/Kconfig | 2 +-
> arch/riscv/Kconfig | 2 +-
> drivers/of/Kconfig | 4 ----
> drivers/of/address.c | 2 +-
> include/linux/dma-map-ops.h | 2 ++
> kernel/dma/Kconfig | 7 +++++++
> kernel/dma/mapping.c | 6 +++++-
> 7 files changed, 17 insertions(+), 8 deletions(-)
>
> --
> 2.39.2 (Apple Git-143)
>