From: Anup Patel <apatel@ventanamicro.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Thomas Gleixner <tglx@linutronix.de>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Frank Rowand <frowand.list@gmail.com>,
Conor Dooley <conor+dt@kernel.org>
Cc: "Anup Patel" <apatel@ventanamicro.com>,
devicetree@vger.kernel.org,
"Conor Dooley" <conor.dooley@microchip.com>,
"Saravana Kannan" <saravanak@google.com>,
"Marc Zyngier" <maz@kernel.org>,
"Anup Patel" <anup@brainfault.org>,
linux-kernel@vger.kernel.org,
"Krzysztof Kozlowski" <krzysztof.kozlowski@linaro.org>,
"Björn Töpel" <bjorn@kernel.org>,
"Atish Patra" <atishp@atishpatra.org>,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
"Andrew Jones" <ajones@ventanamicro.com>
Subject: [PATCH v14 09/18] dt-bindings: interrupt-controller: Add RISC-V incoming MSI controller
Date: Thu, 22 Feb 2024 15:09:57 +0530 [thread overview]
Message-ID: <20240222094006.1030709-10-apatel@ventanamicro.com> (raw)
In-Reply-To: <20240222094006.1030709-1-apatel@ventanamicro.com>
Add DT bindings document for the RISC-V incoming MSI controller (IMSIC)
defined by the RISC-V advanced interrupt architecture (AIA) specification.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
.../interrupt-controller/riscv,imsics.yaml | 172 ++++++++++++++++++
1 file changed, 172 insertions(+)
create mode 100644 Documentation/devicetree/bindings/interrupt-controller/riscv,imsics.yaml
diff --git a/Documentation/devicetree/bindings/interrupt-controller/riscv,imsics.yaml b/Documentation/devicetree/bindings/interrupt-controller/riscv,imsics.yaml
new file mode 100644
index 000000000000..84976f17a4a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/interrupt-controller/riscv,imsics.yaml
@@ -0,0 +1,172 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/interrupt-controller/riscv,imsics.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: RISC-V Incoming MSI Controller (IMSIC)
+
+maintainers:
+ - Anup Patel <anup@brainfault.org>
+
+description: |
+ The RISC-V advanced interrupt architecture (AIA) defines a per-CPU incoming
+ MSI controller (IMSIC) for handling MSIs in a RISC-V platform. The RISC-V
+ AIA specification can be found at https://github.com/riscv/riscv-aia.
+
+ The IMSIC is a per-CPU (or per-HART) device with separate interrupt file
+ for each privilege level (machine or supervisor). The configuration of
+ a IMSIC interrupt file is done using AIA CSRs and it also has a 4KB MMIO
+ space to receive MSIs from devices. Each IMSIC interrupt file supports a
+ fixed number of interrupt identities (to distinguish MSIs from devices)
+ which is same for given privilege level across CPUs (or HARTs).
+
+ The device tree of a RISC-V platform will have one IMSIC device tree node
+ for each privilege level (machine or supervisor) which collectively describe
+ IMSIC interrupt files at that privilege level across CPUs (or HARTs).
+
+ The arrangement of IMSIC interrupt files in MMIO space of a RISC-V platform
+ follows a particular scheme defined by the RISC-V AIA specification. A IMSIC
+ group is a set of IMSIC interrupt files co-located in MMIO space and we can
+ have multiple IMSIC groups (i.e. clusters, sockets, chiplets, etc) in a
+ RISC-V platform. The MSI target address of a IMSIC interrupt file at given
+ privilege level (machine or supervisor) encodes group index, HART index,
+ and guest index (shown below).
+
+ XLEN-1 > (HART Index MSB) 12 0
+ | | | |
+ -------------------------------------------------------------
+ |xxxxxx|Group Index|xxxxxxxxxxx|HART Index|Guest Index| 0 |
+ -------------------------------------------------------------
+
+allOf:
+ - $ref: /schemas/interrupt-controller.yaml#
+ - $ref: /schemas/interrupt-controller/msi-controller.yaml#
+
+properties:
+ compatible:
+ items:
+ - enum:
+ - qemu,imsics
+ - const: riscv,imsics
+
+ reg:
+ minItems: 1
+ maxItems: 16384
+ description:
+ Base address of each IMSIC group.
+
+ interrupt-controller: true
+
+ "#interrupt-cells":
+ const: 0
+
+ msi-controller: true
+
+ "#msi-cells":
+ const: 0
+
+ interrupts-extended:
+ minItems: 1
+ maxItems: 16384
+ description:
+ This property represents the set of CPUs (or HARTs) for which given
+ device tree node describes the IMSIC interrupt files. Each node pointed
+ to should be a riscv,cpu-intc node, which has a CPU node (i.e. RISC-V
+ HART) as parent.
+
+ riscv,num-ids:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 63
+ maximum: 2047
+ description:
+ Number of interrupt identities supported by IMSIC interrupt file.
+
+ riscv,num-guest-ids:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 63
+ maximum: 2047
+ description:
+ Number of interrupt identities are supported by IMSIC guest interrupt
+ file. When not specified it is assumed to be same as specified by the
+ riscv,num-ids property.
+
+ riscv,guest-index-bits:
+ minimum: 0
+ maximum: 7
+ default: 0
+ description:
+ Number of guest index bits in the MSI target address.
+
+ riscv,hart-index-bits:
+ minimum: 0
+ maximum: 15
+ description:
+ Number of HART index bits in the MSI target address. When not
+ specified it is calculated based on the interrupts-extended property.
+
+ riscv,group-index-bits:
+ minimum: 0
+ maximum: 7
+ default: 0
+ description:
+ Number of group index bits in the MSI target address.
+
+ riscv,group-index-shift:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 55
+ default: 24
+ description:
+ The least significant bit position of the group index bits in the
+ MSI target address.
+
+required:
+ - compatible
+ - reg
+ - interrupt-controller
+ - msi-controller
+ - "#msi-cells"
+ - interrupts-extended
+ - riscv,num-ids
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ // Example 1 (Machine-level IMSIC files with just one group):
+
+ interrupt-controller@24000000 {
+ compatible = "qemu,imsics", "riscv,imsics";
+ interrupts-extended = <&cpu1_intc 11>,
+ <&cpu2_intc 11>,
+ <&cpu3_intc 11>,
+ <&cpu4_intc 11>;
+ reg = <0x28000000 0x4000>;
+ interrupt-controller;
+ #interrupt-cells = <0>;
+ msi-controller;
+ #msi-cells = <0>;
+ riscv,num-ids = <127>;
+ };
+
+ - |
+ // Example 2 (Supervisor-level IMSIC files with two groups):
+
+ interrupt-controller@28000000 {
+ compatible = "qemu,imsics", "riscv,imsics";
+ interrupts-extended = <&cpu1_intc 9>,
+ <&cpu2_intc 9>,
+ <&cpu3_intc 9>,
+ <&cpu4_intc 9>;
+ reg = <0x28000000 0x2000>, /* Group0 IMSICs */
+ <0x29000000 0x2000>; /* Group1 IMSICs */
+ interrupt-controller;
+ #interrupt-cells = <0>;
+ msi-controller;
+ #msi-cells = <0>;
+ riscv,num-ids = <127>;
+ riscv,group-index-bits = <1>;
+ riscv,group-index-shift = <24>;
+ };
+...
--
2.34.1
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next prev parent reply other threads:[~2024-02-22 9:42 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 9:39 [PATCH v14 00/18] Linux RISC-V AIA Support Anup Patel
2024-02-22 9:39 ` [PATCH v14 01/18] irqchip/sifive-plic: Convert PLIC driver into a platform driver Anup Patel
2024-04-03 8:29 ` Lad, Prabhakar
2024-04-03 14:16 ` Anup Patel
2024-04-03 15:49 ` Lad, Prabhakar
2024-04-03 16:28 ` Samuel Holland
2024-04-03 18:10 ` Lad, Prabhakar
2024-04-03 16:42 ` Anup Patel
2024-04-03 17:19 ` Anup Patel
2024-02-22 9:39 ` [PATCH v14 02/18] irqchip/sifive-plic: Use dev_xyz() in-place of pr_xyz() Anup Patel
2024-02-22 9:39 ` [PATCH v14 03/18] irqchip/sifive-plic: Use devm_xyz() for managed allocation Anup Patel
2024-02-22 9:39 ` [PATCH v14 04/18] irqchip/sifive-plic: Use riscv_get_intc_hwnode() to get parent fwnode Anup Patel
2024-02-22 9:39 ` [PATCH v14 05/18] irqchip/sifive-plic: Cleanup PLIC contexts upon irqdomain creation failure Anup Patel
2024-02-22 9:39 ` [PATCH v14 06/18] irqchip/sifive-plic: Parse number of irqs and contexts early in plic_probe Anup Patel
2024-02-22 9:39 ` [PATCH v14 07/18] irqchip/sifive-plic: Improve locking safety by using irqsave/irqrestore Anup Patel
2024-02-22 9:39 ` [PATCH v14 08/18] irqchip/riscv-intc: Add support for RISC-V AIA Anup Patel
2024-02-22 9:39 ` Anup Patel [this message]
2024-02-22 9:39 ` [PATCH v14 10/18] genirq/matrix: Dynamic bitmap allocation Anup Patel
2024-02-22 9:39 ` [PATCH v14 11/18] irqchip: Add RISC-V incoming MSI controller early driver Anup Patel
2024-02-22 13:13 ` Björn Töpel
2024-02-22 13:42 ` Anup Patel
2024-02-22 14:15 ` Björn Töpel
2024-02-23 8:28 ` Thomas Gleixner
2024-02-23 9:52 ` Anup Patel
2024-02-22 9:40 ` [PATCH v14 12/18] irqchip/riscv-imsic: Add device MSI domain support for platform devices Anup Patel
2024-02-22 13:15 ` Björn Töpel
2024-02-22 13:44 ` Anup Patel
2024-02-22 9:40 ` [PATCH v14 13/18] irqchip/riscv-imsic: Add device MSI domain support for PCI devices Anup Patel
2024-02-22 13:14 ` Björn Töpel
2024-02-22 13:30 ` Anup Patel
2024-02-22 14:05 ` Björn Töpel
2024-02-22 9:40 ` [PATCH v14 14/18] dt-bindings: interrupt-controller: Add RISC-V advanced PLIC Anup Patel
2024-02-22 9:40 ` [PATCH v14 15/18] irqchip: Add RISC-V advanced PLIC driver for direct-mode Anup Patel
2024-02-22 9:40 ` [PATCH v14 16/18] irqchip/riscv-aplic: Add support for MSI-mode Anup Patel
2024-02-22 9:40 ` [PATCH v14 17/18] RISC-V: Select APLIC and IMSIC drivers Anup Patel
2024-02-22 9:40 ` [PATCH v14 18/18] MAINTAINERS: Add entry for RISC-V AIA drivers Anup Patel
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