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llvmpipe: add loongarch util_get_cpu_caps function

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When use LA464(3A5000 pc), LLVM18 and kernel(which not supports lsx/lasx),
it will get a illegal instruction error. LA464 will return LA464 and
LA664 will return a generic when calling getHostCPUName(). Return LA464
name will add all feature(+f,+d,+lsx,+lasx,lvz) by default and generate
vector instruction, generic will add null. Hence we use util_get_cpu_caps
to judge if kernel supports lsx/lasx or not.

Set lsx and lasx by util_get_cpu_caps. Only LLVM 18 on loongarch
supports lsx and lasx completely. LLVM 16 isn't supported and
LLVM 17's LSX support is incomplete.

Signed-off-by: Jiale Zhao <zhaojiale@loongson.cn>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30220>
This commit is contained in:
Jiale Zhao
2024-08-01 15:29:26 +08:00
committed by Marge Bot
parent a780305818
commit a9e1ecf6f0
4 changed files with 45 additions and 7 deletions
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src/util/u_cpu_detect.c
+31
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@@ -470,6 +470,31 @@ check_os_mips64_support(void)
}
#endif /* DETECT_ARCH_MIPS64 */
#if DETECT_ARCH_LOONGARCH64
static void
check_os_loongarch64_support(void)
{
#if DETECT_OS_LINUX
Elf64_auxv_t aux;
int fd;
fd = open("/proc/self/auxv", O_RDONLY | O_CLOEXEC);
if (fd >= 0) {
while (read(fd, &aux, sizeof(Elf64_auxv_t)) == sizeof(Elf64_auxv_t)) {
if (aux.a_type == AT_HWCAP) {
uint64_t hwcap = aux.a_un.a_val;
util_cpu_caps.has_lsx = (hwcap >> 4) & 1;
util_cpu_caps.has_lasx = (hwcap >> 5) & 1;
break;
}
}
close (fd);
}
#endif /* DETECT_OS_LINUX */
}
#endif /* DETECT_ARCH_LOONGARCH64 */
static void
get_cpu_topology(void)
@@ -943,6 +968,10 @@ _util_cpu_detect_once(void)
check_os_mips64_support();
#endif /* DETECT_ARCH_MIPS64 */
#if DETECT_ARCH_LOONGARCH64
check_os_loongarch64_support();
#endif /* DETECT_ARCH_LOONGARCH64 */
#if DETECT_ARCH_S390
util_cpu_caps.family = CPU_S390X;
#endif
@@ -980,6 +1009,8 @@ _util_cpu_detect_once(void)
printf("util_cpu_caps.has_neon = %u\n", util_cpu_caps.has_neon);
printf("util_cpu_caps.has_msa = %u\n", util_cpu_caps.has_msa);
printf("util_cpu_caps.has_daz = %u\n", util_cpu_caps.has_daz);
printf("util_cpu_caps.has_lsx = %u\n", util_cpu_caps.has_lsx);
printf("util_cpu_caps.has_lasx = %u\n", util_cpu_caps.has_lasx);
printf("util_cpu_caps.has_avx512f = %u\n", util_cpu_caps.has_avx512f);
printf("util_cpu_caps.has_avx512dq = %u\n", util_cpu_caps.has_avx512dq);
printf("util_cpu_caps.has_avx512ifma = %u\n", util_cpu_caps.has_avx512ifma);