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author | Andrew Jones <ajones@ventanamicro.com> | 2023-11-22 17:47:04 +0100 |
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committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-01-03 03:36:49 -0800 |
commit | e178bf146e4b8c774a7b00aa2419e400f4f7894f (patch) | |
tree | 23cdfbc75b8f05af3034171cb06833900268be79 /arch/riscv/include/uapi/asm/hwprobe.h | |
parent | 53b2b22850e1ff9e2729ce8efe2d846ed7d3bff4 (diff) | |
download | lwn-e178bf146e4b8c774a7b00aa2419e400f4f7894f.tar.gz lwn-e178bf146e4b8c774a7b00aa2419e400f4f7894f.zip |
RISC-V: hwprobe: Introduce which-cpus flag
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>
Diffstat (limited to 'arch/riscv/include/uapi/asm/hwprobe.h')
-rw-r--r-- | arch/riscv/include/uapi/asm/hwprobe.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h index b659ffcfcdb4..7aa7d5c71e79 100644 --- a/arch/riscv/include/uapi/asm/hwprobe.h +++ b/arch/riscv/include/uapi/asm/hwprobe.h @@ -40,4 +40,7 @@ struct riscv_hwprobe { #define RISCV_HWPROBE_KEY_ZICBOZ_BLOCK_SIZE 6 /* Increase RISCV_HWPROBE_MAX_KEY when adding items. */ +/* Flags */ +#define RISCV_HWPROBE_WHICH_CPUS (1 << 0) + #endif |