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Date: Mon, 9 Jan 2023 15:34:10 -0600
From: Alex Elder <elder@...aro.org>
To: Elliot Berman <quic_eberman@...cinc.com>,
Bjorn Andersson <quic_bjorande@...cinc.com>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Murali Nalajala <quic_mnalajal@...cinc.com>
Cc: Trilok Soni <quic_tsoni@...cinc.com>,
Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>,
Carl van Schaik <quic_cvanscha@...cinc.com>,
Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Jonathan Corbet <corbet@....net>,
Bagas Sanjaya <bagasdotme@...il.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>,
Jassi Brar <jassisinghbrar@...il.com>,
Sudeep Holla <sudeep.holla@....com>,
Mark Rutland <mark.rutland@....com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v8 02/28] dt-bindings: Add binding for gunyah hypervisor
On 12/19/22 4:58 PM, Elliot Berman wrote:
> When Linux is booted as a guest under the Gunyah hypervisor, the Gunyah
> Resource Manager applies a devicetree overlay describing the virtual
> platform configuration of the guest VM, such as the message queue
> capability IDs for communicating with the Resource Manager. This
> information is not otherwise discoverable by a VM: the Gunyah hypervisor
> core does not provide a direct interface to discover capability IDs nor
> a way to communicate with RM without having already known the
> corresponding message queue capability ID. Add the DT bindings that
> Gunyah adheres for the hypervisor node and message queues.
>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
At this point I have no input on this patch; if Rob's happy with the
bindings, that's good enough for me.
-Alex
> ---
> .../bindings/firmware/gunyah-hypervisor.yaml | 82 +++++++++++++++++++
> MAINTAINERS | 1 +
> 2 files changed, 83 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
>
> diff --git a/Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml b/Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
> new file mode 100644
> index 000000000000..9fd1d254b156
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
> @@ -0,0 +1,82 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/gunyah-hypervisor.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Gunyah Hypervisor
> +
> +maintainers:
> + - Murali Nalajala <quic_mnalajal@...cinc.com>
> + - Elliot Berman <quic_eberman@...cinc.com>
> +
> +description: |+
> + Gunyah virtual machines use this information to determine the capability IDs
> + of the message queues used to communicate with the Gunyah Resource Manager.
> + See also: https://github.com/quic/gunyah-resource-manager/blob/develop/src/vm_creation/dto_construct.c
> +
> +properties:
> + compatible:
> + const: gunyah-hypervisor
> +
> + "#address-cells":
> + description: Number of cells needed to represent 64-bit capability IDs.
> + const: 2
> +
> + "#size-cells":
> + description: must be 0, because capability IDs are not memory address
> + ranges and do not have a size.
> + const: 0
> +
> +patternProperties:
> + "^gunyah-resource-mgr(@.*)?":
> + type: object
> + description:
> + Resource Manager node which is required to communicate to Resource
> + Manager VM using Gunyah Message Queues.
> +
> + properties:
> + compatible:
> + const: gunyah-resource-manager
> +
> + reg:
> + items:
> + - description: Gunyah capability ID of the TX message queue
> + - description: Gunyah capability ID of the RX message queue
> +
> + interrupts:
> + items:
> + - description: Interrupt for the TX message queue
> + - description: Interrupt for the RX message queue
> +
> + additionalProperties: false
> +
> + required:
> + - compatible
> + - reg
> + - interrupts
> +
> +additionalProperties: false
> +
> +required:
> + - compatible
> + - "#address-cells"
> + - "#size-cells"
> +
> +examples:
> + - |
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> + hypervisor {
> + #address-cells = <2>;
> + #size-cells = <0>;
> + compatible = "gunyah-hypervisor";
> +
> + gunyah-resource-mgr@0 {
> + compatible = "gunyah-resource-manager";
> + interrupts = <GIC_SPI 3 IRQ_TYPE_EDGE_RISING>, /* TX full IRQ */
> + <GIC_SPI 4 IRQ_TYPE_EDGE_RISING>; /* RX empty IRQ */
> + reg = <0x00000000 0x00000000>, <0x00000000 0x00000001>;
> + /* TX, RX cap ids */
> + };
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1dd8f58d6e01..f32320a9efa4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8939,6 +8939,7 @@ M: Elliot Berman <quic_eberman@...cinc.com>
> M: Murali Nalajala <quic_mnalajal@...cinc.com>
> L: linux-arm-msm@...r.kernel.org
> S: Supported
> +F: Documentation/devicetree/bindings/firmware/gunyah-hypervisor.yaml
> F: Documentation/virt/gunyah/
>
> HABANALABS PCI DRIVER
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