riscv: hwprobe: Add thead vendor extension probing

Add a new hwprobe key "RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0" which
allows userspace to probe for the new RISCV_ISA_VENDOR_EXT_XTHEADVECTOR
vendor e

riscv: hwprobe: Add thead vendor extension probing

Add a new hwprobe key "RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0" which
allows userspace to probe for the new RISCV_ISA_VENDOR_EXT_XTHEADVECTOR
vendor extension.

This new key will allow userspace code to probe for which thead vendor
extensions are supported. This API is modeled to be consistent with
RISCV_HWPROBE_KEY_IMA_EXT_0. The bitmask returned will have each bit
corresponding to a supported thead vendor extension of the cpumask set.
Just like RISCV_HWPROBE_KEY_IMA_EXT_0, this allows a userspace program
to determine all of the supported thead vendor extensions in one call.

Signed-off-by: Charlie Jenkins <[email protected]>
Reviewed-by: Evan Green <[email protected]>
Tested-by: Yangyu Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...

riscv: Add thead and xtheadvector as a vendor extension

Add support to the kernel for THead vendor extensions with the target of
the new extension xtheadvector.

Signed-off-by: Charlie Jenkins <char

riscv: Add thead and xtheadvector as a vendor extension

Add support to the kernel for THead vendor extensions with the target of
the new extension xtheadvector.

Signed-off-by: Charlie Jenkins <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Tested-by: Yangyu Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...

riscv: Extend cpufeature.c to detect vendor extensions

Instead of grouping all vendor extensions into the same riscv_isa_ext
that standard instructions use, create a struct
"riscv_isa_vendor_ext_dat

riscv: Extend cpufeature.c to detect vendor extensions

Instead of grouping all vendor extensions into the same riscv_isa_ext
that standard instructions use, create a struct
"riscv_isa_vendor_ext_data_list" that allows each vendor to maintain
their vendor extensions independently of the standard extensions.
xandespmu is currently the only vendor extension so that is the only
extension that is affected by this change.

An additional benefit of this is that the extensions of each vendor can
be conditionally enabled. A config RISCV_ISA_VENDOR_EXT_ANDES has been
added to allow for that.

Signed-off-by: Charlie Jenkins <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Reviewed-by: Andy Chiu <[email protected]>
Tested-by: Yu Chien Peter Lin <[email protected]>
Reviewed-by: Yu Chien Peter Lin <[email protected]>
Link: https://lore.kernel.org/r/20240719-support_vendor_extensions-v3-1-0af7587bbec0@rivosinc.com
Signed-off-by: Palmer Dabbelt <[email protected]>

show more ...