| Message ID | 20240911-xtheadvector-v10-2-8d3930091246@rivosinc.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | riscv: Add support for xtheadvector | expand |
Charlie Jenkins <charlie@rivosinc.com> 於 2024年9月12日 週四 下午1:57寫道： > > Add a property analogous to the vlenb CSR so that software can detect > the vector length of each CPU prior to it being brought online. > Currently software has to assume that the vector length read from the > boot CPU applies to all possible CPUs. On T-Head CPUs implementing > pre-ratification vector, reading the th.vlenb CSR may produce an illegal > instruction trap, so this property is required on such systems. > > Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com> Reviewed-by: Andy Chiu <andybnac@gmail.com> > --- > Documentation/devicetree/bindings/riscv/cpus.yaml | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml > index 8edc8261241a..c0cf6cf56749 100644 > --- a/Documentation/devicetree/bindings/riscv/cpus.yaml > +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml > @@ -26,6 +26,18 @@ description: | > allOf: > - $ref: /schemas/cpu.yaml# > - $ref: extensions.yaml > + - if: > + not: > + properties: > + compatible: > + contains: > + enum: > + - thead,c906 > + - thead,c910 > + - thead,c920 > + then: > + properties: > + thead,vlenb: false > > properties: > compatible: > @@ -95,6 +107,13 @@ properties: > description: > The blocksize in bytes for the Zicboz cache operations. > > + thead,vlenb: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + VLEN/8, the vector register length in bytes. This property is required on > + thead systems where the vector register length is not identical on all harts, or > + the vlenb CSR is not available. > + > # RISC-V has multiple properties for cache op block sizes as the sizes > # differ between individual CBO extensions > cache-op-block-size: false > > -- > 2.45.0 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-riscv
diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml index 8edc8261241a..c0cf6cf56749 100644 --- a/Documentation/devicetree/bindings/riscv/cpus.yaml +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml @@ -26,6 +26,18 @@ description: | allOf: - $ref: /schemas/cpu.yaml# - $ref: extensions.yaml + - if: + not: + properties: + compatible: + contains: + enum: + - thead,c906 + - thead,c910 + - thead,c920 + then: + properties: + thead,vlenb: false properties: compatible: @@ -95,6 +107,13 @@ properties: description: The blocksize in bytes for the Zicboz cache operations. + thead,vlenb: + $ref: /schemas/types.yaml#/definitions/uint32 + description: + VLEN/8, the vector register length in bytes. This property is required on + thead systems where the vector register length is not identical on all harts, or + the vlenb CSR is not available. + # RISC-V has multiple properties for cache op block sizes as the sizes # differ between individual CBO extensions cache-op-block-size: false