On Sat, May 4, 2024 at 3:33 AM Charlie Jenkins <charlie@xxxxxxxxxxxx> wrote: > > From: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> > > 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: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> > Signed-off-by: Charlie Jenkins <charlie@xxxxxxxxxxxx> Reviewed-by: Andy Chiu <andy.chiu@xxxxxxxxxx> > --- > Documentation/devicetree/bindings/riscv/cpus.yaml | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml b/Documentation/devicetree/bindings/riscv/cpus.yaml > index d87dd50f1a4b..edcb6a7d9319 100644 > --- a/Documentation/devicetree/bindings/riscv/cpus.yaml > +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml > @@ -94,6 +94,12 @@ properties: > description: > The blocksize in bytes for the Zicboz cache operations. > > + riscv,vlenb: > + $ref: /schemas/types.yaml#/definitions/uint32 > + description: > + VLEN/8, the vector register length in bytes. This property is required in > + systems where the vector register length is not identical on all harts. > + > # RISC-V has multiple properties for cache op block sizes as the sizes > # differ between individual CBO extensions > cache-op-block-size: false > > -- > 2.44.0 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv
