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Wed, 29 Jul 2026 09:39:52 -0700 (PDT) From: Yu-Chien Peter Lin To: devicetree@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, samuel.holland@sifive.com, dlan@kernel.org, guodong@riscstar.com, dfustini@oss.tenstorrent.com, michal.simek@amd.com, junhui.liu@pigmoral.tech, darshan.prajapati@einfochips.com, akpm@linux-foundation.org, zhangchunyan@iscas.ac.cn, luxu.kernel@bytedance.com, pincheng.plct@isrc.iscas.ac.cn, nick.hu@sifive.com, jim.shu@sifive.com, zong.li@sifive.com, greentime.hu@sifive.com, robin.randhawa@sifive.com, scott@riscstar.com, dave.patel@riscstar.com, raymond.mao@riscstar.com, anup@brainfault.org, pawandeep.oza@oss.qualcomm.com, Yu-Chien Peter Lin Subject: [PATCH v2 3/3] dt-bindings: sifive: Add WorldGuard Checker Date: Thu, 30 Jul 2026 00:39:08 +0800 Message-ID: <20260729163908.249838-4-peter.lin@sifive.com> X-Mailer: git-send-email 2.48.0 In-Reply-To: <20260729163908.249838-1-peter.lin@sifive.com> References: <20260729163908.249838-1-peter.lin@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add YAML binding schema for the SiFive wgChecker, a programmable access controller integrated in the interconnect fabric of RISC-V Worlds-capable SoCs. wgChecker enforces World ID (WID) based access control on downstream bus transactions. Each checker slot encodes a 2-bit permission field per WID (read/write), enabling fine-grained memory partitioning and device isolation between execution contexts. Violations are reported via bus errors, interrupts, or both, selectable and lockable per slot. The binding registers wgChecker as an access-controllers provider. Consumers (i.e. its protected device) reference it via the standard access-controllers phandle to declare their access requirements. Also document the sifive,trustedwid property for the /cpus node, identifying the privileged WID authorized to configure all checkers on the platform. Link: https://github.com/riscvarchive/security/blob/main/papers/worldguard%20proposal.pdf Signed-off-by: Yu-Chien Peter Lin Reviewed-by: Zong Li Reviewed-by: Jim Shu --- .../devicetree/bindings/riscv/worlds.yaml | 9 + .../bindings/sifive/sifive,wgchecker2.yaml | 356 ++++++++++++++++++ 2 files changed, 365 insertions(+) create mode 100644 Documentation/devicetree/bindings/sifive/sifive,wgchecker2.yaml diff --git a/Documentation/devicetree/bindings/riscv/worlds.yaml b/Documentation/devicetree/bindings/riscv/worlds.yaml index cc8b3747591e..c39a06c2dd8d 100644 --- a/Documentation/devicetree/bindings/riscv/worlds.yaml +++ b/Documentation/devicetree/bindings/riscv/worlds.yaml @@ -34,6 +34,14 @@ properties: minimum: 2 maximum: 64 + sifive,trustedwid: + $ref: /schemas/types.yaml#/definitions/uint32 + maximum: 31 + description: | + The World ID (WID) designated as the trusted WID for this platform. + Transactions tagged with this WID are authorized to access and configure + WorldGuard blocks, including wgCheckers and wgMarkers. + additionalProperties: true examples: @@ -44,6 +52,7 @@ examples: #size-cells = <0>; timebase-frequency = <1000000>; riscv,nworlds = <4>; + sifive,trustedwid = <3>; cpu@0 { device_type = "cpu"; diff --git a/Documentation/devicetree/bindings/sifive/sifive,wgchecker2.yaml b/Documentation/devicetree/bindings/sifive/sifive,wgchecker2.yaml new file mode 100644 index 000000000000..c025a4765cb3 --- /dev/null +++ b/Documentation/devicetree/bindings/sifive/sifive,wgchecker2.yaml @@ -0,0 +1,356 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) 2026 SiFive, Inc. +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/sifive/sifive,wgchecker2.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: SiFive WorldGuard Checker + +maintainers: + - Yu-Chien Peter Lin + +description: | + The RISC-V Worlds ISA extension defines World IDs (WIDs) as architectural + identifiers that tag each system transaction with its originating context. + System integrators assign WIDs to execution contexts such as privilege modes, + trusted execution environments, or other isolation boundaries. + + The SiFive WorldGuard Checker is a hardware firewall positioned in the + system interconnect fabric. It inspects every transaction, evaluating the + WID against access control policies encoded in checker slots for each + protected resource. Transactions from unauthorized WIDs are blocked and + reported as bus errors, interrupts, or both. + + This enables spatial partitioning of memory regions and memory-mapped devices + across execution contexts. Different address ranges can enforce distinct + policies, allowing isolated workloads to coexist with hardware-enforced + protection. + + The wgChecker acts as an access-controller provider as defined in the + access-controllers framework. Protected devices are consumers that declare + their access policy via the access-controllers property. The hardware + supports up to 32 World IDs. + + The World ID authorized to configure WorldGuard blocks is specified by the + sifive,trustedwid property in the /cpus node. + +allOf: + - $ref: /schemas/access-controllers/access-controllers.yaml# + +properties: + compatible: + oneOf: + - items: + - const: qemu,wgchecker2 + - const: sifive,wgchecker2 + - const: sifive,wgchecker2 + + reg: + maxItems: 1 + description: + Base address and size of the wgChecker memory-mapped I/O registers. + + interrupts: + maxItems: 1 + description: + Interrupt line asserted when a WID access violation is detected and + interrupt reporting is enabled in the slot configuration (IR or IW + bits set). + + '#access-controller-cells': + const: 1 + description: | + Specifies the partition identifier to reference a partition child + node that defines the access control region, WID permissions, and + access failure configuration. The special ID 0xFFFFFFFF indicates + unprotected mode, granting unrestricted access to the device. + + '#address-cells': + const: 1 + + '#size-cells': + const: 0 + +patternProperties: + "^partition@[0-9a-f]+$": + type: object + additionalProperties: false + + properties: + reg: + maximum: 0xFFFFFFFE + description: + Partition identifier. Must be unique within the wgChecker node. + The value 0xFFFFFFFF is reserved for unprotected mode and must + not be used. + + sifive,protected-region: + $ref: /schemas/types.yaml#/definitions/uint32-array + description: + Protected memory region encoded as a base address and size. + items: + - description: Upper 32 bits of the base address + - description: Lower 32 bits of the base address + - description: Upper 32 bits of the region size + - description: Lower 32 bits of the region size + + sifive,slot-permissions: + $ref: /schemas/types.yaml#/definitions/uint64 + description: | + 64-bit WID permission bitmap. Each WID N uses two consecutive bits: + - bit[2*N] : Read permission for WID N + - bit[2*N+1]: Write permission for WID N + Set bits grant access. + + sifive,slot-config: + $ref: /schemas/types.yaml#/definitions/uint32 + maximum: 0x1F + description: | + Access failure configuration flags for this slot: + bit[0] (ER): report read violations as bus errors + bit[1] (EW): report write violations as bus errors + bit[2] (IR): report read violations via interrupt + bit[3] (IW): report write violations via interrupt + bit[4] (L) : lock this slot against further modification + Bits[5:31] are reserved and must be zero. + + required: + - reg + - sifive,protected-region + - sifive,slot-permissions + - sifive,slot-config + +required: + - compatible + - reg + - '#address-cells' + - '#size-cells' + - '#access-controller-cells' + +additionalProperties: false + +examples: + - | + #include + + // Example 1: Peripheral device protection + + cpus { + #address-cells = <1>; + #size-cells = <0>; + timebase-frequency = <1000000>; + riscv,nworlds = <4>; + sifive,trustedwid = <3>; + + cpu@0 { + device_type = "cpu"; + reg = <0>; + compatible = "riscv"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "c", "smlwid"; + riscv,pmwid = <3>; + + cpu_intc0: interrupt-controller { + #interrupt-cells = <1>; + compatible = "riscv,cpu-intc"; + interrupt-controller; + }; + }; + }; + + soc { + #address-cells = <2>; + #size-cells = <2>; + + uart: uart@1c1000 { + compatible = "ns16550a"; + reg = <0x0 0x001c1000 0x0 0x1000>; + reg-names = "control"; + interrupts = <10 IRQ_TYPE_LEVEL_HIGH>; + access-controllers = <&wgchecker0 0>; + }; + + wgchecker0: access-controller@1c2000 { + compatible = "qemu,wgchecker2", "sifive,wgchecker2"; + reg = <0x0 0x001c2000 0x0 0x1000>; + #access-controller-cells = <1>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <80 IRQ_TYPE_LEVEL_HIGH>; + interrupt-parent = <&aplic0_m>; + + partition@0 { + reg = <0>; + sifive,protected-region = <0x0 0x001c1000 0x0 0x00001000>; + sifive,slot-permissions = <0x0 0x000000c3>; + sifive,slot-config = <0x0f>; + }; + }; + + aplic0_m: interrupt-controller@c000000 { + compatible = "qemu,aplic", "riscv,aplic"; + reg = <0x0 0xc000000 0x0 0x4000>; + interrupt-controller; + #interrupt-cells = <2>; + riscv,num-sources = <96>; + interrupts-extended = <&cpu_intc0 11>; + }; + }; + + - | + #include + + // Example 2: Device with multiple address regions and per-region access rules + + cpus { + #address-cells = <1>; + #size-cells = <0>; + timebase-frequency = <1000000>; + riscv,nworlds = <16>; + sifive,trustedwid = <3>; + + cpu@0 { + device_type = "cpu"; + reg = <0>; + compatible = "riscv"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "c", "smlwid"; + riscv,pmwid = <3>; + + cpu_intc1: interrupt-controller { + #interrupt-cells = <1>; + compatible = "riscv,cpu-intc"; + interrupt-controller; + }; + }; + }; + + soc { + #address-cells = <2>; + #size-cells = <2>; + + device: device@10000 { + compatible = "vendor,soc1-ip"; + reg = <0x0 0x00010000 0x0 0x8000>, + <0x0 0x00a00000 0x0 0x4000>; + reg-names = "m_mode", "s_mode"; + // m_mode: WID 3 only; s_mode: WID 0,3 RW + access-controllers = <&wgchecker1 0>, + <&wgchecker1 1>; + }; + + wgchecker1: access-controller@35000 { + compatible = "qemu,wgchecker2", "sifive,wgchecker2"; + reg = <0x0 0x00035000 0x0 0x1000>; + #access-controller-cells = <1>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <81 IRQ_TYPE_LEVEL_HIGH>; + interrupt-parent = <&aplic1_m>; + + partition@0 { + reg = <0>; + sifive,protected-region = <0x0 0x00010000 0x0 0x00008000>; + sifive,slot-permissions = <0x0 0x000000c0>; + sifive,slot-config = <0x0f>; + }; + + partition@1 { + reg = <1>; + sifive,protected-region = <0x0 0x00a00000 0x0 0x00004000>; + sifive,slot-permissions = <0x0 0x000000c3>; + sifive,slot-config = <0x0f>; + }; + }; + + aplic1_m: interrupt-controller@c000000 { + compatible = "qemu,aplic", "riscv,aplic"; + reg = <0x0 0xc000000 0x0 0x4000>; + interrupt-controller; + #interrupt-cells = <2>; + riscv,num-sources = <96>; + interrupts-extended = <&cpu_intc1 11>; + }; + }; + + - | + #include + + // Example 3: DRAM partitioning with a secure enclave + + cpus { + #address-cells = <1>; + #size-cells = <0>; + timebase-frequency = <1000000>; + riscv,nworlds = <4>; + sifive,trustedwid = <3>; + + cpu@0 { + device_type = "cpu"; + reg = <0>; + compatible = "riscv"; + riscv,isa-base = "rv64i"; + riscv,isa-extensions = "i", "m", "a", "c", "smlwid", "smwiddeleg", "sswid"; + riscv,pmwid = <3>; + + cpu_intc2: interrupt-controller { + #interrupt-cells = <1>; + compatible = "riscv,cpu-intc"; + interrupt-controller; + }; + }; + }; + + soc { + #address-cells = <2>; + #size-cells = <2>; + + memory@80000000 { + device_type = "memory"; + reg = <0x0 0x80000000 0x0 0x80000000>; + access-controllers = <&wgchecker2 0>, + <&wgchecker2 1>, + <&wgchecker2 2>; + }; + + wgchecker2: access-controller@40000000 { + compatible = "qemu,wgchecker2", "sifive,wgchecker2"; + reg = <0x0 0x40000000 0x0 0x1000>; + #access-controller-cells = <1>; + #address-cells = <1>; + #size-cells = <0>; + interrupts = <82 IRQ_TYPE_LEVEL_HIGH>; + interrupt-parent = <&aplic2_m>; + + partition@0 { + reg = <0>; + sifive,protected-region = <0x0 0x80000000 0x0 0x40000000>; + sifive,slot-permissions = <0x0 0x000000cf>; + sifive,slot-config = <0x0f>; + }; + + partition@1 { + reg = <1>; + sifive,protected-region = <0x0 0xc0000000 0x0 0x01000000>; + sifive,slot-permissions = <0x0 0x000000cc>; + sifive,slot-config = <0x0f>; + }; + + partition@2 { + reg = <2>; + sifive,protected-region = <0x0 0xc1000000 0x0 0x3f000000>; + sifive,slot-permissions = <0x0 0x000000cf>; + sifive,slot-config = <0x0f>; + }; + }; + + aplic2_m: interrupt-controller@c000000 { + compatible = "qemu,aplic", "riscv,aplic"; + reg = <0x0 0xc000000 0x0 0x4000>; + interrupt-controller; + #interrupt-cells = <2>; + riscv,num-sources = <96>; + interrupts-extended = <&cpu_intc2 11>; + }; + }; -- 2.43.7