Messages in this thread | | | Date | Tue, 2 Feb 2021 08:02:03 -0800 | From | "Raj, Ashok" <> | Subject | Re: [PATCH 1/3] iommu/vt-d: Add new enum value and structure for SATC |
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On Tue, Feb 02, 2021 at 12:40:55PM +0800, Lu Baolu wrote: > From: Yian Chen <yian.chen@intel.com> > > Starting from Intel Platform VT-d v3.2, BIOS may provide new remapping > structure SATC for SOC integrated devices, according to section 8.8 of > Intel VT-d architecture specification v3.2. The SATC structure reports > a list of the devices that require SATC enabling via ATS capacity.
nit: s/require SATC/require ATS for normal device operation. This is a functional requirement that these devices will not work without OS enabling ATS capability.
> > This patch introduces the new enum value and structure to represent the > remapping information. Kernel should parse the information from the > reporting structure and enable ATC for the devices as needed. > > Signed-off-by: Yian Chen <yian.chen@intel.com> > --- > include/acpi/actbl1.h | 11 ++++++++++- > 1 file changed, 10 insertions(+), 1 deletion(-) > > diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h > index 43549547ed3e..b7ca802b66d2 100644 > --- a/include/acpi/actbl1.h > +++ b/include/acpi/actbl1.h > @@ -514,7 +514,8 @@ enum acpi_dmar_type { > ACPI_DMAR_TYPE_ROOT_ATS = 2, > ACPI_DMAR_TYPE_HARDWARE_AFFINITY = 3, > ACPI_DMAR_TYPE_NAMESPACE = 4, > - ACPI_DMAR_TYPE_RESERVED = 5 /* 5 and greater are reserved */ > + ACPI_DMAR_TYPE_SATC = 5, > + ACPI_DMAR_TYPE_RESERVED = 6 /* 5 and greater are reserved */ > }; >
Think Joerg spotted the comment update.
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