diff options
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/core.c')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/core.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c index d8cc5223b7ce..12f967c6b603 100644 --- a/arch/x86/kernel/cpu/resctrl/core.c +++ b/arch/x86/kernel/cpu/resctrl/core.c @@ -22,7 +22,7 @@ #include <linux/cpuhotplug.h> #include <asm/intel-family.h> -#include <asm/resctrl_sched.h> +#include <asm/resctrl.h> #include "internal.h" /* Mutex to protect rdtgroup access. */ @@ -958,6 +958,36 @@ static __init void rdt_init_res_defs(void) static enum cpuhp_state rdt_online; +/* Runs once on the BSP during boot. */ +void resctrl_cpu_detect(struct cpuinfo_x86 *c) +{ + if (!cpu_has(c, X86_FEATURE_CQM_LLC)) { + c->x86_cache_max_rmid = -1; + c->x86_cache_occ_scale = -1; + c->x86_cache_mbm_width_offset = -1; + return; + } + + /* will be overridden if occupancy monitoring exists */ + c->x86_cache_max_rmid = cpuid_ebx(0xf); + + if (cpu_has(c, X86_FEATURE_CQM_OCCUP_LLC) || + cpu_has(c, X86_FEATURE_CQM_MBM_TOTAL) || + cpu_has(c, X86_FEATURE_CQM_MBM_LOCAL)) { + u32 eax, ebx, ecx, edx; + + /* QoS sub-leaf, EAX=0Fh, ECX=1 */ + cpuid_count(0xf, 1, &eax, &ebx, &ecx, &edx); + + c->x86_cache_max_rmid = ecx; + c->x86_cache_occ_scale = ebx; + if (c->x86_vendor == X86_VENDOR_INTEL) + c->x86_cache_mbm_width_offset = eax & 0xff; + else + c->x86_cache_mbm_width_offset = -1; + } +} + static int __init resctrl_late_init(void) { struct rdt_resource *r; |