RISC-V: hwprobe: Introduce which-cpus flag

Browse source

Introduce the first flag for the hwprobe syscall. The flag basically
reverses its behavior, i.e. instead of populating the values of keys
for a given set of cpus, the set of cpus after the call is the result
of finding a set which supports the values of the keys. In order to
do this, we implement a pair compare function which takes the type of
value (a single value vs. a bitmask of booleans) into consideration.
We also implement vdso support for the new flag.

Signed-off-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Link: https://lore.kernel.org/r/20231122164700.127954-9-ajones@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

...

This commit is contained in:

Andrew Jones 2023-11-22 17:47:04 +01:00 • committed by Palmer Dabbelt

parent 53b2b22850

commit e178bf146e

No known key found for this signature in database

GPG key ID: 2E1319F35FBB1889

5 changed files with 204 additions and 14 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

17

Documentation/arch/riscv/hwprobe.rst

View file

24

arch/riscv/include/asm/hwprobe.h

View file

3

arch/riscv/include/uapi/asm/hwprobe.h

View file

94

arch/riscv/kernel/sys_hwprobe.c

View file

80

arch/riscv/kernel/vdso/hwprobe.c

View file