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Re: [PATCH v4 4/4] xen/arm: its: handle dma-noncoherent on GIC and ITS nodes
- To: Mykola Kvach <mykola_kvach@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Fri, 23 Oct 2026 12:52:21 +0200
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Fri, 23 Oct 2026 10:52:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29-Sep-26 21:02, Mykola Kvach wrote:
> The DT dma-noncoherent property describes the bus coherency of the
> device represented by the node. On an ITS subnode, that is memory
> accessed by that ITS. Add GICV3_QUIRK_MEM_NC_NS to the corresponding
> host_its and use it when programming GITS_CBASER and GITS_BASER<n>.
>
> On the top-level GIC node, the property describes the Redistributor side
> of the LPI path. Collect it in gicv3_lpi_init_host_lpis() and apply it
> only to the host LPI policy used when allocating the property and
> pending tables and when programming GICR_PROPBASER and GICR_PENDBASER.
> Mark the function init-only because firmware attributes are collected
> only during boot.
>
> Do not inherit the property between parent and child nodes: ITS-node
> non-coherency does not change the global host LPI policy, and GIC-node
> non-coherency does not change per-ITS quirk_flags.
>
> ACPI is unchanged; this patch only consumes the DT dma-noncoherent
> property.
>
> Signed-off-by: Mykola Kvach <mykola_kvach@xxxxxxxx>
> Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx
Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
~Michal
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