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SubjectRe: [PATCH v2] iommu/vt-d: Make DMAR_UNITS_SUPPORTED a config setting
On Thu, May 12, 2022 at 10:13:09AM -0500, Steve Wahl wrote:
> To support up to 64 sockets with 10 DMAR units each (640), make the
> value of DMAR_UNITS_SUPPORTED adjustable by a config variable,
> CONFIG_DMAR_UNITS_SUPPORTED, and make it's default 1024 when MAXSMP is
> set.
>
> If the available hardware exceeds DMAR_UNITS_SUPPORTED (previously set
> to MAX_IO_APICS, or 128), it causes these messages: "DMAR: Failed to
> allocate seq_id", "DMAR: Parse DMAR table failure.", and "x2apic: IRQ
> remapping doesn't support X2APIC mode x2apic disabled"; and the system
> fails to boot properly.
>
> Signed-off-by: Steve Wahl <steve.wahl@hpe.com>
> ---
>
> Note that we could not find a reason for connecting
> DMAR_UNITS_SUPPORTED to MAX_IO_APICS as was done previously. Perhaps
> it seemed like the two would continue to match on earlier processors.
> There doesn't appear to be kernel code that assumes that the value of
> one is related to the other.
>
> v2: Make this value a config option, rather than a fixed constant. The default
> values should match previous configuration except in the MAXSMP case. Keeping the
> value at a power of two was requested by Kevin Tian.
>
> drivers/iommu/intel/Kconfig | 6 ++++++
> include/linux/dmar.h | 6 +-----
> 2 files changed, 7 insertions(+), 5 deletions(-)
>

Baolu do you have this queued up for v5.20? Also do you have a public repo where
you keep the vt-d changes before sending Joerg the patches for a release?

Regards,
Jerry

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