diff options
Diffstat (limited to 'arch/x86/kernel/cpu/resctrl/monitor.c')
| -rw-r--r-- | arch/x86/kernel/cpu/resctrl/monitor.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c b/arch/x86/kernel/cpu/resctrl/monitor.c index c8945610d455..dffcc8307500 100644 --- a/arch/x86/kernel/cpu/resctrl/monitor.c +++ b/arch/x86/kernel/cpu/resctrl/monitor.c @@ -242,7 +242,9 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d, u32 unused, u32 rmid, enum resctrl_event_id eventid, u64 *val, void *ignored) { + struct rdt_hw_mon_domain *hw_dom = resctrl_to_arch_mon_dom(d); int cpu = cpumask_any(&d->hdr.cpu_mask); + struct arch_mbm_state *am; u64 msr_val; u32 prmid; int ret; @@ -251,12 +253,16 @@ int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d, prmid = logical_rmid_to_physical_rmid(cpu, rmid); ret = __rmid_read_phys(prmid, eventid, &msr_val); - if (ret) - return ret; - *val = get_corrected_val(r, d, rmid, eventid, msr_val); + if (!ret) { + *val = get_corrected_val(r, d, rmid, eventid, msr_val); + } else if (ret == -EINVAL) { + am = get_arch_mbm_state(hw_dom, rmid, eventid); + if (am) + am->prev_msr = 0; + } - return 0; + return ret; } static int __cntr_id_read(u32 cntr_id, u64 *val) @@ -355,6 +361,7 @@ static const struct x86_cpu_id snc_cpu_ids[] __initconst = { X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X, 0), X86_MATCH_VFM(INTEL_GRANITERAPIDS_X, 0), X86_MATCH_VFM(INTEL_ATOM_CRESTMONT_X, 0), + X86_MATCH_VFM(INTEL_ATOM_DARKMONT_X, 0), {} }; @@ -452,7 +459,16 @@ int __init rdt_get_mon_l3_config(struct rdt_resource *r) r->mon.mbm_cfg_mask = ecx & MAX_EVT_CONFIG_BITS; } - if (rdt_cpu_has(X86_FEATURE_ABMC)) { + /* + * resctrl assumes a system that supports assignable counters can + * switch to "default" mode. Ensure that there is a "default" mode + * to switch to. This enforces a dependency between the independent + * X86_FEATURE_ABMC and X86_FEATURE_CQM_MBM_TOTAL/X86_FEATURE_CQM_MBM_LOCAL + * hardware features. + */ + if (rdt_cpu_has(X86_FEATURE_ABMC) && + (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL) || + rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))) { r->mon.mbm_cntr_assignable = true; cpuid_count(0x80000020, 5, &eax, &ebx, &ecx, &edx); r->mon.num_mbm_cntrs = (ebx & GENMASK(15, 0)) + 1; |