Re: [edk2-devel] [PATCH v1 0/3] Add support for handling SGI and pending interrupts

["Ard Biesheuvel" <ardb@kernel.org>]

On Mon, 24 Jul 2023 at 22:15, Kun Qin <kuqin12@gmail.com> wrote:
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4466
>
> This patch series introduce a few improvements related to interrupt
> handling for ArmGic driver and library.
>
> 1. The current implementation of the `ArmGicSendSgiTo` is based on GIC v2
> and does not work on GIC v3 and on.
> 2. The pending interrupt related primitives does not exist for end users.
>
> The change added the SGI support compatible with GIC v3 and v4. A few
> pending interrupt related utility functions were also added.
>
> This change was tested on QEMU, FVP and proprietary hardware platforms.
>
> Pathc v1 branch: https://github.com/kuqin12/edk2/tree/improve_gic_v1
>
> Cc: Leif Lindholm <quic_llindhol@quicinc.com>
> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> Cc: Sami Mujawar <sami.mujawar@arm.com>
>
> Kun Qin (3):
>   ArmPkg: ArmGic: Added support to send SGI to NS G1 EL1
>   ArmPkg: ArmGicLib: Added GIC v3 and v4 support to ArmGicSendSgiTo
>   ArmPkg: ArmGic: Added functionalities to manipulate pending interrupts
>

Hello Kun,

Could you please explain how this will be used by platforms?

SGIs are only used by the MPcore SEC code, which is deprecated and
shouldn't be used. And manipulating pending interrupts is another
thing we should only support if there is a compelling use case.


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