From 15fa2c5e359149a0b67b8572cd7dab87626b48ae Mon Sep 17 00:00:00 2001 From: =?utf8?q?Marek=20Ol=C5=A1=C3=A1k?= Date: Wed, 5 Sep 2018 21:30:44 -0400 Subject: [PATCH] gallium/u_cpu_detect: get the number of cores per L3 cache for AMD Zen Reviewed-by: Brian Paul --- src/gallium/auxiliary/util/u_cpu_detect.c | 24 +++++++++++++++++++++++ src/gallium/auxiliary/util/u_cpu_detect.h | 1 + 2 files changed, 25 insertions(+) diff --git a/src/gallium/auxiliary/util/u_cpu_detect.c b/src/gallium/auxiliary/util/u_cpu_detect.c index 29f4ce98203..751443f06f9 100644 --- a/src/gallium/auxiliary/util/u_cpu_detect.c +++ b/src/gallium/auxiliary/util/u_cpu_detect.c @@ -367,6 +367,28 @@ check_os_arm_support(void) } #endif /* PIPE_ARCH_ARM */ +static void +get_cpu_topology(void) +{ + uint32_t regs[4]; + + /* Default. This is correct if L3 is not present or there is only one. */ + util_cpu_caps.cores_per_L3 = util_cpu_caps.nr_cpus; + +#if defined(PIPE_ARCH_X86) || defined(PIPE_ARCH_X86_64) + /* AMD Zen */ + if (util_cpu_caps.x86_cpu_type == 0x17) { + /* Query the L3 cache topology information. */ + cpuid_count(0x8000001D, 3, regs); + unsigned cache_level = (regs[0] >> 5) & 0x7; + unsigned cores_per_cache = ((regs[0] >> 14) & 0xfff) + 1; + + if (cache_level == 3) + util_cpu_caps.cores_per_L3 = cores_per_cache; + } +#endif +} + static void util_cpu_detect_once(void) { @@ -520,6 +542,8 @@ util_cpu_detect_once(void) check_os_altivec_support(); #endif /* PIPE_ARCH_PPC */ + get_cpu_topology(); + #ifdef DEBUG if (debug_get_option_dump_cpu()) { debug_printf("util_cpu_caps.nr_cpus = %u\n", util_cpu_caps.nr_cpus); diff --git a/src/gallium/auxiliary/util/u_cpu_detect.h b/src/gallium/auxiliary/util/u_cpu_detect.h index 19f5567ca7b..efc910d1473 100644 --- a/src/gallium/auxiliary/util/u_cpu_detect.h +++ b/src/gallium/auxiliary/util/u_cpu_detect.h @@ -51,6 +51,7 @@ struct util_cpu_caps { /* Feature flags */ int x86_cpu_type; unsigned cacheline; + unsigned cores_per_L3; unsigned has_intel:1; unsigned has_tsc:1; -- 2.30.2