Re: [v9,5/7] PCI: mediatek-gen3: Add MSI support

Marc Zyngier
2021-03-24T16:19:28Z

On Wed, 24 Mar 2021 03:05:08 +0000,
Jianjun Wang <jianjun.wang@mediatek.com> wrote:
>
> Add MSI support for MediaTek Gen3 PCIe controller.
>
> This PCIe controller supports up to 256 MSI vectors, the MSI hardware
> block diagram is as follows:
>
> +-----+
> | GIC |
> +-----+
> ^
> |
> port->irq
> |
> +-+-+-+-+-+-+-+-+
> |0|1|2|3|4|5|6|7| (PCIe intc)
> +-+-+-+-+-+-+-+-+
> ^ ^ ^
> | | ... |
> +-------+ +------+ +-----------+
> | | |
> +-+-+---+--+--+ +-+-+---+--+--+ +-+-+---+--+--+
> |0|1|...|30|31| |0|1|...|30|31| |0|1|...|30|31| (MSI sets)
> +-+-+---+--+--+ +-+-+---+--+--+ +-+-+---+--+--+
> ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
> | | | | | | | | | | | | (MSI vectors)
> | | | | | | | | | | | |
>
> (MSI SET0) (MSI SET1) ... (MSI SET7)
>
> With 256 MSI vectors supported, the MSI vectors are composed of 8 sets,
> each set has its own address for MSI message, and supports 32 MSI vectors
> to generate interrupt.
>
> Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
> Acked-by: Ryder Lee <ryder.lee@mediatek.com>

Reviewed-by: Marc Zyngier <maz@kernel.org>

M.

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