Hi Ard,
Our current use case is around AP core suspension and wake-ups.
The program can suspend the secondary cores through PSCI interfaces
(after powering
them on). BSP can then wake up the suspended cores through SGI on demand.
The pending interrupt manipulation is to support BSP suspension and
wakeup. We
currently use watchdog timer to wake up suspended BSPs after a timeout.
Platforms can perform needed tasks during suspension, such as core power
consumption
analysis, in UEFI environment.
Please let me if you have any suggestions.
Thanks,
Kun
On 7/26/2023 1:45 AM, Ard Biesheuvel wrote:
On Mon, 24 Jul 2023 at 22:15, Kun Qin <kuqi...@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_llind...@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Sami Mujawar <sami.muja...@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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