diff options
Diffstat (limited to 'drivers/powercap')
| -rw-r--r-- | drivers/powercap/intel_rapl.c | 59 |
1 files changed, 20 insertions, 39 deletions
diff --git a/drivers/powercap/intel_rapl.c b/drivers/powercap/intel_rapl.c index 3413692c4dde..cdfd01f0adb8 100644 --- a/drivers/powercap/intel_rapl.c +++ b/drivers/powercap/intel_rapl.c @@ -191,6 +191,7 @@ struct rapl_package { * notify interrupt enable status. */ struct list_head plist; + int lead_cpu; /* one active cpu per package for access */ }; struct rapl_defaults { @@ -267,20 +268,6 @@ static struct rapl_package *find_package_by_id(int id) return NULL; } -/* caller to ensure CPU hotplug lock is held */ -static int find_active_cpu_on_package(int package_id) -{ - int i; - - for_each_online_cpu(i) { - if (topology_physical_package_id(i) == package_id) - return i; - } - /* all CPUs on this package are offline */ - - return -ENODEV; -} - /* caller must hold cpu hotplug lock */ static void rapl_cleanup_data(void) { @@ -761,10 +748,8 @@ static int rapl_read_data_raw(struct rapl_domain *rd, msr = rd->msrs[rp->id]; if (!msr) return -EINVAL; - /* use physical package id to look up active cpus */ - cpu = find_active_cpu_on_package(rd->rp->id); - if (cpu < 0) - return cpu; + + cpu = rd->rp->lead_cpu; /* special-case package domain, which uses a different bit*/ if (prim == FW_LOCK && rd->id == RAPL_DOMAIN_PACKAGE) { @@ -829,10 +814,7 @@ static int rapl_write_data_raw(struct rapl_domain *rd, struct msrl_action ma; int ret; - cpu = find_active_cpu_on_package(rd->rp->id); - if (cpu < 0) - return cpu; - + cpu = rd->rp->lead_cpu; bits = rapl_unit_xlate(rd, rp->unit, value, 1); bits |= bits << rp->shift; memset(&ma, 0, sizeof(ma)); @@ -940,18 +922,10 @@ static void power_limit_irq_save_cpu(void *info) static void package_power_limit_irq_save(struct rapl_package *rp) { - int cpu; - - if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) - return; - - cpu = find_active_cpu_on_package(rp->id); - if (cpu < 0) - return; if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) return; - smp_call_function_single(cpu, power_limit_irq_save_cpu, rp, 1); + smp_call_function_single(rp->lead_cpu, power_limit_irq_save_cpu, rp, 1); } static void power_limit_irq_restore_cpu(void *info) @@ -972,20 +946,14 @@ static void power_limit_irq_restore_cpu(void *info) /* restore per package power limit interrupt enable state */ static void package_power_limit_irq_restore(struct rapl_package *rp) { - int cpu; - if (!boot_cpu_has(X86_FEATURE_PTS) || !boot_cpu_has(X86_FEATURE_PLN)) return; - cpu = find_active_cpu_on_package(rp->id); - if (cpu < 0) - return; - /* irq enable state not saved, nothing to restore */ if (!(rp->power_limit_irq & PACKAGE_PLN_INT_SAVED)) return; - smp_call_function_single(cpu, power_limit_irq_restore_cpu, rp, 1); + smp_call_function_single(rp->lead_cpu, power_limit_irq_restore_cpu, rp, 1); } static void set_floor_freq_default(struct rapl_domain *rd, bool mode) @@ -1419,7 +1387,8 @@ static int rapl_detect_topology(void) /* add the new package to the list */ new_package->id = phy_package_id; new_package->nr_cpus = 1; - + /* use the first active cpu of the package to access */ + new_package->lead_cpu = i; /* check if the package contains valid domains */ if (rapl_detect_domains(new_package, i) || rapl_defaults->check_unit(new_package, i)) { @@ -1475,6 +1444,8 @@ static int rapl_add_package(int cpu) /* add the new package to the list */ rp->id = phy_package_id; rp->nr_cpus = 1; + rp->lead_cpu = cpu; + /* check if the package contains valid domains */ if (rapl_detect_domains(rp, cpu) || rapl_defaults->check_unit(rp, cpu)) { @@ -1507,6 +1478,7 @@ static int rapl_cpu_callback(struct notifier_block *nfb, unsigned long cpu = (unsigned long)hcpu; int phy_package_id; struct rapl_package *rp; + int lead_cpu; phy_package_id = topology_physical_package_id(cpu); switch (action) { @@ -1527,6 +1499,15 @@ static int rapl_cpu_callback(struct notifier_block *nfb, break; if (--rp->nr_cpus == 0) rapl_remove_package(rp); + else if (cpu == rp->lead_cpu) { + /* choose another active cpu in the package */ + lead_cpu = cpumask_any_but(topology_core_cpumask(cpu), cpu); + if (lead_cpu < nr_cpu_ids) + rp->lead_cpu = lead_cpu; + else /* should never go here */ + pr_err("no active cpu available for package %d\n", + phy_package_id); + } } return NOTIFY_OK; |