RISC-V: Detect unaligned vector accesses supported

Run an unaligned vector access to test if the system supports vector unaligned access. Add the result to a new key in hwprobe. This is useful for usermode to know if vector misaligned accesses are supported and if they are faster or slower than equivalent byte accesses. Signed-off-by: Jesse Taube <jesse@rivosinc.com> Signed-off-by: Charlie Jenkins <charlie@rivosinc.com> Link: https://lore.kernel.org/r/20241017-jesse_unaligned_vector-v10-4-5b33500160f8@rivosinc.com Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
2026-11-10 20:48:12 +00:00 · 2024-10-17 12:00:21 -07:00 · 2024-10-17 12:00:21 -07:00 · d1703dc7bc
commit d1703dc7bc
parent c05a62c925
11 changed files with 222 additions and 30 deletions
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
--- a/arch/riscv/include/asm/cpufeature.h
+++ b/arch/riscv/include/asm/cpufeature.h
--- a/arch/riscv/include/asm/entry-common.h
+++ b/arch/riscv/include/asm/entry-common.h
--- a/arch/riscv/include/asm/hwprobe.h
+++ b/arch/riscv/include/asm/hwprobe.h
--- a/arch/riscv/include/asm/vector.h
+++ b/arch/riscv/include/asm/vector.h
--- a/arch/riscv/include/uapi/asm/hwprobe.h
+++ b/arch/riscv/include/uapi/asm/hwprobe.h
--- a/arch/riscv/kernel/Makefile
+++ b/arch/riscv/kernel/Makefile
--- a/arch/riscv/kernel/sys_hwprobe.c
+++ b/arch/riscv/kernel/sys_hwprobe.c
--- a/arch/riscv/kernel/traps_misaligned.c
+++ b/arch/riscv/kernel/traps_misaligned.c
--- a/arch/riscv/kernel/unaligned_access_speed.c
+++ b/arch/riscv/kernel/unaligned_access_speed.c
--- a/arch/riscv/kernel/vector.c
+++ b/arch/riscv/kernel/vector.c