hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IC35SV -------------------------------- When MBM is implemented according to the *DDI0598* protocol, that is, mbm_total_bytes interface returns the statistical results of instantaneous bandwidth traffic, there is no need to create a delay_work to handle MBM statistical overflow. Fixes: 9119da143939 ("arm_mpam: resctrl: Allow resctrl to allocate monitors") Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- arch/x86/include/asm/resctrl.h | 2 ++ drivers/platform/mpam/mpam_devices.c | 10 +++++++++- fs/resctrl/rdtgroup.c | 9 +++++---- include/linux/arm_mpam.h | 1 + 4 files changed, 17 insertions(+), 5 deletions(-) diff --git a/arch/x86/include/asm/resctrl.h b/arch/x86/include/asm/resctrl.h index 37b8d7dfcfed..c5f90edc3e20 100644 --- a/arch/x86/include/asm/resctrl.h +++ b/arch/x86/include/asm/resctrl.h @@ -94,6 +94,8 @@ static inline bool resctrl_arch_is_mbm_total_enabled(void) return (rdt_mon_features & (1 << QOS_L3_MBM_TOTAL_EVENT_ID)); } +static inline bool resctrl_arch_would_mbm_overflow(void) { return true; } + static inline bool resctrl_arch_is_mbm_local_enabled(void) { return (rdt_mon_features & (1 << QOS_L3_MBM_LOCAL_EVENT_ID)); diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c index e99f6b0b3d59..c148ecd47613 100644 --- a/drivers/platform/mpam/mpam_devices.c +++ b/drivers/platform/mpam/mpam_devices.c @@ -921,6 +921,14 @@ static const struct midr_range mbwu_flowrate_list[] = { { /* sentinel */ } }; +bool resctrl_arch_would_mbm_overflow(void) +{ + if (is_midr_in_range_list(read_cpuid_id(), mbwu_flowrate_list)) + return false; + + return true; +} + static void __ris_msmon_read(void *arg) { bool nrdy = false; @@ -1009,7 +1017,7 @@ static void __ris_msmon_read(void *arg) * was last reset in the latest version (DDI0598D_b). */ if (ris->comp->class->type == MPAM_CLASS_MEMORY) { - if (is_midr_in_range_list(read_cpuid_id(), mbwu_flowrate_list)) + if (!resctrl_arch_would_mbm_overflow()) break; } diff --git a/fs/resctrl/rdtgroup.c b/fs/resctrl/rdtgroup.c index 13c64231c82d..a631dcecdeaa 100644 --- a/fs/resctrl/rdtgroup.c +++ b/fs/resctrl/rdtgroup.c @@ -2714,7 +2714,7 @@ static int rdt_get_tree(struct fs_context *fc) if (resctrl_arch_alloc_capable() || resctrl_arch_mon_capable()) resctrl_mounted = true; - if (resctrl_is_mbm_enabled()) { + if (resctrl_is_mbm_enabled() && resctrl_arch_would_mbm_overflow()) { list_for_each_entry(dom, &l3->domains, list) mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL, RESCTRL_PICK_ANY_CPU); @@ -3943,7 +3943,7 @@ void resctrl_offline_domain(struct rdt_resource *r, struct rdt_domain *d) if (resctrl_mounted && resctrl_arch_mon_capable()) rmdir_mondata_subdir_allrdtgrp(r, d->id); - if (resctrl_is_mbm_enabled()) + if (resctrl_is_mbm_enabled() && resctrl_arch_would_mbm_overflow()) cancel_delayed_work(&d->mbm_over); if (resctrl_arch_is_llc_occupancy_enabled() && has_busy_rmid(d)) { /* @@ -4014,7 +4014,7 @@ int resctrl_online_domain(struct rdt_resource *r, struct rdt_domain *d) if (err) goto out_unlock; - if (resctrl_is_mbm_enabled()) { + if (resctrl_is_mbm_enabled() && resctrl_arch_would_mbm_overflow()) { INIT_DELAYED_WORK(&d->mbm_over, mbm_handle_overflow); mbm_setup_overflow_handler(d, MBM_OVERFLOW_INTERVAL, RESCTRL_PICK_ANY_CPU); @@ -4075,7 +4075,8 @@ void resctrl_offline_cpu(unsigned int cpu) d = resctrl_get_domain_from_cpu(cpu, l3); if (d) { - if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu) { + if (resctrl_is_mbm_enabled() && cpu == d->mbm_work_cpu && + resctrl_arch_would_mbm_overflow()) { cancel_delayed_work(&d->mbm_over); mbm_setup_overflow_handler(d, 0, cpu); } diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h index d70e4e726fe6..c80f220d98d6 100644 --- a/include/linux/arm_mpam.h +++ b/include/linux/arm_mpam.h @@ -66,6 +66,7 @@ bool resctrl_arch_mon_capable(void); bool resctrl_arch_is_llc_occupancy_enabled(void); bool resctrl_arch_is_mbm_local_enabled(void); bool resctrl_arch_is_mbm_total_enabled(void); +bool resctrl_arch_would_mbm_overflow(void); /* reset cached configurations, then all devices */ void resctrl_arch_reset_resources(void); -- 2.25.1