hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC35SV -------------------------------- Allow users can configure the mata hard-limit feature and cache soft-limit feature by the schemata MBHDL:${domain_id}=${value} interface under the resctrl fs. When MAX bandwidth is exceeded, the hard-limit feature not allows the partition use any more bandwidth until the memory bandwidth measurement for the partition falls below MAX. Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- drivers/platform/mpam/mpam_devices.c | 16 +++++++++-- drivers/platform/mpam/mpam_internal.h | 2 ++ drivers/platform/mpam/mpam_resctrl.c | 40 ++++++++++++++++++++++++++- include/linux/resctrl_types.h | 1 + 4 files changed, 56 insertions(+), 3 deletions(-) diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c index 80ef4eb908e8..8190272e5a1b 100644 --- a/drivers/platform/mpam/mpam_devices.c +++ b/drivers/platform/mpam/mpam_devices.c @@ -607,8 +607,10 @@ static void mpam_ris_hw_probe(struct mpam_msc_ris *ris) mpam_set_feature(mpam_feat_mbw_part, props); props->bwa_wd = FIELD_GET(MPAMF_MBW_IDR_BWA_WD, mbw_features); - if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features)) + if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MAX, mbw_features)) { mpam_set_feature(mpam_feat_mbw_max, props); + mpam_set_feature(mpam_feat_max_limit, props); + } if (props->bwa_wd && FIELD_GET(MPAMF_MBW_IDR_HAS_MIN, mbw_features)) mpam_set_feature(mpam_feat_mbw_min, props); @@ -1192,6 +1194,7 @@ static void mpam_reset_msc_bitmap(struct mpam_msc *msc, u16 reg, u16 wd) static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid, struct mpam_config *cfg) { + bool limit; u32 pri_val = 0; u16 intpri, dspri; u16 cmax = MPAMCFG_CMAX_CMAX; @@ -1245,7 +1248,16 @@ static void mpam_reprogram_ris_partid(struct mpam_msc_ris *ris, u16 partid, if (mpam_has_feature(mpam_feat_mbw_max, rprops)) { if (mpam_has_feature(mpam_feat_mbw_max, cfg)) - mpam_write_partsel_reg(msc, MBW_MAX, cfg->mbw_max | MPAMCFG_MBW_MAX_HARDLIM); + bwa_fract = cfg->mbw_max; + + if (mpam_has_feature(mpam_feat_max_limit, cfg)) + limit = cfg->max_limit; + else + limit = false; + + if (limit) + mpam_write_partsel_reg(msc, MBW_MAX, bwa_fract | + MPAMCFG_MBW_MAX_HARDLIM); else mpam_write_partsel_reg(msc, MBW_MAX, bwa_fract); } diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h index 47582ddc554f..e9c52078edea 100644 --- a/drivers/platform/mpam/mpam_internal.h +++ b/drivers/platform/mpam/mpam_internal.h @@ -90,6 +90,7 @@ enum mpam_device_features { mpam_feat_mbw_part, mpam_feat_mbw_min, mpam_feat_mbw_max, + mpam_feat_max_limit, mpam_feat_mbw_prop, mpam_feat_intpri_part, mpam_feat_intpri_part_0_low, @@ -164,6 +165,7 @@ struct mpam_config { u32 mbw_pbm; u16 mbw_max; u16 mbw_min; + bool max_limit; u16 cmax; u16 cmin; diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c index 854aa414a03c..53bca8ba056a 100644 --- a/drivers/platform/mpam/mpam_resctrl.c +++ b/drivers/platform/mpam/mpam_resctrl.c @@ -522,6 +522,14 @@ static bool class_has_usable_intpri(struct mpam_props *cprops) return false; } +static bool class_has_usable_max_limit(struct mpam_props *cprops) +{ + if (mpam_has_feature(mpam_feat_max_limit, cprops)) + return true; + + return false; +} + /* * Calculate the percentage change from each implemented bit in the control * This can return 0 when BWA_WD is greater than 6. (100 / (1<<7) == 0) @@ -723,8 +731,8 @@ static void mpam_resctrl_pick_caches(void) static void mpam_resctrl_pick_mba(void) { + bool has_mba, has_mbw_min, has_intpri, has_limit; struct mpam_resctrl_res *res; - bool has_mba, has_mbw_min, has_intpri; struct mpam_class *class; int idx; @@ -737,6 +745,7 @@ static void mpam_resctrl_pick_mba(void) has_mba = class_has_usable_mba(cprops); has_mbw_min = class_has_usable_mbw_min(cprops); has_intpri = class_has_usable_intpri(cprops); + has_limit = class_has_usable_max_limit(cprops); if (class->level < 3) continue; @@ -761,6 +770,12 @@ static void mpam_resctrl_pick_mba(void) res->class = class; res->resctrl_res.name = "MBPRI"; } + + if (has_limit) { + res = &mpam_resctrl_exports[RDT_RESOURCE_MB_HDL]; + res->class = class; + res->resctrl_res.name = "MBHDL"; + } } srcu_read_unlock(&mpam_srcu, idx); } @@ -981,6 +996,19 @@ static int mpam_resctrl_resource_init(struct mpam_resctrl_res *res) r->alloc_capable = true; break; + case RDT_RESOURCE_MB_HDL: + r->format_str = "%d=%0*u"; + r->schema_fmt = RESCTRL_SCHEMA_RANGE; + r->fflags = RFTYPE_RES_MB; + r->default_ctrl = 1; + r->data_width = 1; + + r->membw.bw_gran = 1; + + if (class_has_usable_max_limit(cprops)) + r->alloc_capable = true; + break; + default: break; } @@ -1127,6 +1155,10 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d, configured_by = mpam_feat_mbw_min; break; + case RDT_RESOURCE_MB_HDL: + configured_by = mpam_feat_max_limit; + break; + default: return -EINVAL; } @@ -1152,6 +1184,8 @@ u32 resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d, return mbw_max_to_percent(cfg->mbw_max, cprops->bwa_wd); case mpam_feat_mbw_min: return mbw_max_to_percent(cfg->mbw_min, cprops->bwa_wd); + case mpam_feat_max_limit: + return cfg->max_limit; default: return -EINVAL; } @@ -1219,6 +1253,10 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d, cfg.mbw_min = percent_to_mbw_max(cfg_val, cprops->bwa_wd); mpam_set_feature(mpam_feat_mbw_min, &cfg); break; + case RDT_RESOURCE_MB_HDL: + cfg.max_limit = cfg_val; + mpam_set_feature(mpam_feat_max_limit, &cfg); + break; default: return -EINVAL; } diff --git a/include/linux/resctrl_types.h b/include/linux/resctrl_types.h index ad8d1ac7ca29..fd1704766c29 100644 --- a/include/linux/resctrl_types.h +++ b/include/linux/resctrl_types.h @@ -87,6 +87,7 @@ enum resctrl_res_level { RDT_RESOURCE_L3_PRI, RDT_RESOURCE_L2_PRI, RDT_RESOURCE_MB_PRI, + RDT_RESOURCE_MB_HDL, #endif /* Must be the last */ -- 2.25.1