Re: [PATCH 1/2] arm/arm64: ACPI: Introduce CONFIG_ACPI_MUST_HAVE_CCA

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On 2015年04月29日 22:42, Catalin Marinas wrote:
On Wed, Apr 29, 2015 at 09:31:03AM -0500, Suravee Suthikulpanit wrote:


On 04/29/2015 09:04 AM, Catalin Marinas wrote:
On Wed, Apr 29, 2015 at 08:44:08AM -0500, Suravee Suthikulpanit wrote:
 From ACPIv6 (http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf),
section 6.2.17 _CCA states that ARM platforms require ACPI _CCA object to be
specified for DMA-cabpable devices. This patch introduces ACPI_MUST_HAVE_CCA
in arm and arm64 Kconfig to specify such requirement.

Note that when _CCA is required, if it is missing in the DSDT. ACPI driver
will default to setting up devices as non-coherent.

Signed-off-by: Mark Salter <msalter@xxxxxxxxxx>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
---
  arch/arm/Kconfig     | 1 +
  arch/arm64/Kconfig   | 1 +
  drivers/acpi/Kconfig | 3 +++
  3 files changed, 5 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 45df48b..2a0d036 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1,6 +1,7 @@
  config ARM
  	bool
  	default y
+	select ACPI_MUST_HAVE_CCA if ACPI
  	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  	select ARCH_HAS_ELF_RANDOMIZE
  	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST

Any plans for ACPI on 32-bit ARM?

Not that I am aware, but I could be totally wrong. The reason I am adding
this here for 32-bit ARM is because the ACPI spec mentioned this.

If you think this is not necessary until we introduce ACPI for ARM32, it can
be removed.

I think it should be removed (as long as ACPI cannot be selected on
arm32).

I agree.

Now there is no plan for ARM32 ACPI as I know, ACPI for ARM targets
for ARM64 based enterprise system at now.

Thanks
Hanjun
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