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| author |   Zong Li <zong.li@sifive.com> | 2020-08-31 15:33:50 +0800 |
|---|---|---|
| committer |   Palmer Dabbelt <palmerdabbelt@google.com> | 2020-09-15 18:46:08 -0700 |
| commit | 38f5bd23deae24c8fa67a2c574b6d43df27a8aa8 (patch) | |
| tree | 5d0762eb60036e15eef0d2a79497e594ee88923f /arch/riscv/include/uapi/asm | |
| parent | riscv: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO (diff) | |
| download | linux-dev-38f5bd23deae24c8fa67a2c574b6d43df27a8aa8.tar.xz linux-dev-38f5bd23deae24c8fa67a2c574b6d43df27a8aa8.zip | |
riscv: Add cache information in AUX vector
There are no standard CSR registers to provide cache information, the
way for RISC-V is to get this information from DT. Currently, AT_L1I_X,
AT_L1D_X and AT_L2_X are present in glibc header, and sysconf syscall
could use them to get information of cache through AUX vector.
The result of 'getconf -a' as follows:
LEVEL1_ICACHE_SIZE 32768
LEVEL1_ICACHE_ASSOC 8
LEVEL1_ICACHE_LINESIZE 64
LEVEL1_DCACHE_SIZE 32768
LEVEL1_DCACHE_ASSOC 8
LEVEL1_DCACHE_LINESIZE 64
LEVEL2_CACHE_SIZE 2097152
LEVEL2_CACHE_ASSOC 32
LEVEL2_CACHE_LINESIZE 64
Signed-off-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Diffstat (limited to 'arch/riscv/include/uapi/asm')
| -rw-r--r-- | arch/riscv/include/uapi/asm/auxvec.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/arch/riscv/include/uapi/asm/auxvec.h b/arch/riscv/include/uapi/asm/auxvec.h index 22e0ae888406..32c73ba1d531 100644 --- a/arch/riscv/include/uapi/asm/auxvec.h +++ b/arch/riscv/include/uapi/asm/auxvec.h @@ -10,7 +10,28 @@ /* vDSO location */ #define AT_SYSINFO_EHDR 33 +/* + * The set of entries below represent more extensive information + * about the caches, in the form of two entry per cache type, + * one entry containing the cache size in bytes, and the other + * containing the cache line size in bytes in the bottom 16 bits + * and the cache associativity in the next 16 bits. + * + * The associativity is such that if N is the 16-bit value, the + * cache is N way set associative. A value if 0xffff means fully + * associative, a value of 1 means directly mapped. + * + * For all these fields, a value of 0 means that the information + * is not known. + */ +#define AT_L1I_CACHESIZE 40 +#define AT_L1I_CACHEGEOMETRY 41 +#define AT_L1D_CACHESIZE 42 +#define AT_L1D_CACHEGEOMETRY 43 +#define AT_L2_CACHESIZE 44 +#define AT_L2_CACHEGEOMETRY 45 + /* entries in ARCH_DLINFO */ -#define AT_VECTOR_SIZE_ARCH 1 +#define AT_VECTOR_SIZE_ARCH 7 #endif /* _UAPI_ASM_RISCV_AUXVEC_H */ |