From: James Morse <james.morse@arm.com> maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8T2RT Reference: https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git/log/?h=mpam/... --------------------------- We already have a helper for reseting an mpam class. Hook it up to resctrl_arch_reset_resources(). Signed-off-by: James Morse <james.morse@arm.com> Signed-off-by: Zeng Heng <zengheng4@huawei.com> --- drivers/platform/mpam/mpam_devices.c | 2 +- drivers/platform/mpam/mpam_internal.h | 2 ++ drivers/platform/mpam/mpam_resctrl.c | 27 +++++++++++++++++++++++++++ include/linux/arm_mpam.h | 3 +++ 4 files changed, 33 insertions(+), 1 deletion(-) diff --git a/drivers/platform/mpam/mpam_devices.c b/drivers/platform/mpam/mpam_devices.c index 28f6010df6dc..13f48878c3d5 100644 --- a/drivers/platform/mpam/mpam_devices.c +++ b/drivers/platform/mpam/mpam_devices.c @@ -2177,7 +2177,7 @@ static void mpam_enable_once(void) READ_ONCE(mpam_partid_max) + 1, mpam_pmg_max + 1); } -static void mpam_reset_class(struct mpam_class *class) +void mpam_reset_class(struct mpam_class *class) { int idx; struct mpam_msc_ris *ris; diff --git a/drivers/platform/mpam/mpam_internal.h b/drivers/platform/mpam/mpam_internal.h index 579a8485d320..9c47d5a35d99 100644 --- a/drivers/platform/mpam/mpam_internal.h +++ b/drivers/platform/mpam/mpam_internal.h @@ -293,6 +293,8 @@ extern u8 mpam_pmg_max; void mpam_enable(struct work_struct *work); void mpam_disable(struct work_struct *work); +void mpam_reset_class(struct mpam_class *class); + int mpam_apply_config(struct mpam_component *comp, u16 partid, struct mpam_config *cfg); diff --git a/drivers/platform/mpam/mpam_resctrl.c b/drivers/platform/mpam/mpam_resctrl.c index c2cf9432e50d..7a54dc7c8056 100644 --- a/drivers/platform/mpam/mpam_resctrl.c +++ b/drivers/platform/mpam/mpam_resctrl.c @@ -248,6 +248,33 @@ int mpam_resctrl_setup(void) return err; } +void resctrl_arch_reset_resources(void) +{ + int i, idx; + struct mpam_class *class; + struct mpam_resctrl_res *res; + + lockdep_assert_cpus_held(); + + if (!mpam_is_enabled()) + return; + + for (i = 0; i < RDT_NUM_RESOURCES; i++) { + res = &mpam_resctrl_exports[i]; + + if (!res->class) + continue; // dummy resource + + if (!res->resctrl_res.alloc_capable) + continue; + + idx = srcu_read_lock(&mpam_srcu); + list_for_each_entry_rcu(class, &mpam_classes, classes_list) + mpam_reset_class(class); + srcu_read_unlock(&mpam_srcu, idx); + } +} + static struct mpam_resctrl_dom * mpam_resctrl_alloc_domain(unsigned int cpu, struct mpam_resctrl_res *res) { diff --git a/include/linux/arm_mpam.h b/include/linux/arm_mpam.h index 576bb97fa552..97d4c8f076e4 100644 --- a/include/linux/arm_mpam.h +++ b/include/linux/arm_mpam.h @@ -50,4 +50,7 @@ static inline bool resctrl_arch_is_mbm_total_enabled(void) return false; } +/* reset cached configurations, then all devices */ +void resctrl_arch_reset_resources(void); + #endif /* __LINUX_ARM_MPAM_H */ -- 2.25.1