From: Yixun Lan <dlan@kernel.org>
To: Guo Ren <guoren@kernel.org>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, spacemit@lists.linux.dev,
junhui.liu@pigmoral.tech, stable@vger.kernel.org,
Guodong Xu <docular.xu@gmail.com>
Subject: Re: [PATCH V2] riscv: dts: spacemit: k3: fix IMSIC num-guest-ids
Date: Mon, 17 Aug 2026 08:50:22 +0000 [thread overview]
Message-ID: <20260817085022-GKB571540@kernel.org> (raw)
In-Reply-To: <20260817033038.2286436-1-guoren@kernel.org>
Hi Guo
On 03:30 Mon 17 Aug , Guo Ren wrote:
> From: "GUO Ren (XuanTie)" <guoren@kernel.org>
>
> The initial K3 device tree used generic/placeholder values for the
> IMSIC guest configuration:
>
> riscv,num-guest-ids = <511>;
>
> According to the SpacemiT K3 User Manual this values is incorrect
> for the X100 cores:
>
> - Advanced Interrupt Architecture (AIA):
> - M-mode MSI: 512
> - S-mode MSI: 512
> - VS-mode MSI: 64
>
> Therefore, S-mode IMSIC (simsic) needs num-guest-ids = 63.
>
> Fixes: 56f37e391a62 ("riscv: dts: spacemit: add initial support for K3 SoC")
> Cc: stable@vger.kernel.org
> Cc: Guodong Xu <docular.xu@gmail.com>
> Cc: Yixun Lan <dlan@kernel.org>
> Signed-off-by: GUO Ren (XuanTie) <guoren@kernel.org>
> ---
> V2:
> - Drop the riscv,guest-index-bits change for simsic: the property
> describes the number of guest index bits in the MSI target address,
> and the per-hart stride on K3 is 0x40000 = 2^(6 + 12), so 6 is
> correct as is.
> - Drop the mimsic changes: already fixed by Junhui.
> - Reword the subject and commit log accordingly.
> ---
> arch/riscv/boot/dts/spacemit/k3.dtsi | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
Reviewed-by: Yixun Lan <dlan@kernel.org>
--
Yixun Lan (dlan)
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prev parent reply other threads:[~2026-08-17 8:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-17 3:30 [PATCH V2] riscv: dts: spacemit: k3: fix IMSIC num-guest-ids Guo Ren
2026-08-17 8:50 ` Yixun Lan [this message]
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